JP6573700B1 - HEAT EXCHANGE SYSTEM AND METHOD OF OPERATING HEAT EXCHANGE SYSTEM - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system capable of maintaining a sealing performance between heat transfer plates of a plate heat exchanger even when steam is adopted as a first fluid, and a method for operating the heat exchange system. . SOLUTION: The present invention discharges a first fluid from a first supply piping system that supplies steam as a first fluid to a first inflow passage of a plate heat exchanger, and a first outflow passage of the plate heat exchanger. A first discharge piping system and a first temperature sensing means for sensing the temperature of the first fluid flowing through the first discharge piping system, and the first supply piping system includes an adjustment valve capable of adjusting a valve opening degree. And the adjusting valve adjusts the valve opening so that the detection result of the first temperature detecting means is lower than the liquefaction temperature of the steam. [Selection] Figure 1

Description

  The present invention relates to a heat exchange system including a plate heat exchanger that exchanges heat between a first fluid and a second fluid, and a method for operating the heat exchange system.

  Conventionally, a heat exchange system including a plate heat exchanger that exchanges heat between a first fluid and a second fluid has been provided (see, for example, Patent Document 1).

  The plate heat exchanger includes a plurality of heat transfer plates. Each of the plurality of heat transfer plates has at least four through holes penetrating in the first direction.

  The plurality of heat transfer plates are overlapped in the first direction such that the through holes at corresponding positions are continuous in the first direction. In this state, the space between the outer peripheral ends of the adjacent heat transfer plates and the periphery of the through hole are liquid-tightly sealed by gaskets or brazing.

  Thus, in this type of plate heat exchanger, the first flow path for flowing the first fluid in the second direction orthogonal to the first direction and the second fluid in the second direction with the heat transfer plate as a boundary. The second flow channels to be circulated are alternately formed in the first direction. Further, the through holes of the plurality of heat transfer plates are continuous in the first direction, so that each of the first inflow path and the first outflow path extends in the first direction, and the first inflow path communicates only with the first flow path; A first outflow path, and a second inflow path and a second outflow path that respectively extend in the first direction and that communicate with only the second flow path are formed.

  Accordingly, the heat exchange system is a first supply piping system connected to the first inflow passage, and is connected to the first supply piping system for supplying the first fluid to the first inflow passage and the first outflow passage. A first discharge piping system for discharging the first fluid from the first outflow passage, and a second supply piping system connected to the second inflow passage, A second supply piping system that supplies two fluids and a second discharge piping system that is connected to the second outflow passage and discharges the second fluid from the second outflow passage.

  In such a heat exchange system, the first fluid is supplied from the first supply piping system to the first inflow passage of the plate heat exchanger, and from the second supply piping system to the second inflow passage of the plate heat exchanger. The second fluid is supplied. If it does so, the 1st fluid which flowed into the 1st inflow way will flow in into a plurality of 1st flow paths, and will circulate in each first flow path toward the 1st outflow path. Further, the second fluid that has flowed into the second inflow path flows into the plurality of second flow paths, and circulates in the second flow paths toward the first outflow path.

  At this time, the first fluid and the second fluid exchange heat through a heat transfer plate that partitions the first flow path and the second flow path. Then, the first fluid that has reached the first outflow passage is discharged to the first discharge piping system, and the second fluid that has reached the second outflow passage is discharged to the second discharge piping system.

  By the way, when heating the second fluid by the heat exchange system, the first fluid is a fluid having a higher temperature than the second fluid. Specifically, in this type of heat exchange system, water, oil, or the like may be employed as the second fluid, and steam (steam) may be employed as the first fluid that heats the second fluid.

  In this case, the first discharge piping system includes a steam trap for selectively discharging only the liquefied drain of the first fluid (steam) without discharging the first fluid (steam) to the outside. Since the steam trap greatly increases the flow resistance of the first fluid, high-pressure steam is supplied to the first inflow passage from the first supply piping system. Thereby, the flowability in the flow path of the 1st fluid from the 1st supply piping system to the 1st discharge piping system is secured.

  However, since the steam temperature is correlated with the steam pressure, as described above, when high-pressure steam is supplied to the first supply piping system, unnecessarily high steam is supplied into the first flow path. Will be.

  Therefore, in this type of heat exchange system, the seal portion of the plate heat exchanger is subject to mechanical or chemical damage due to the thermal effect of the first fluid (steam), and there is a possibility that the sealing performance is lowered.

  Specifically, when high-temperature steam is supplied to the first inflow path and the first flow path, the heat transfer plate that defines the first inflow path and the first flow path is thermally expanded.

  Then, when the heat transfer plates are sealed by brazing, stress is concentrated on the brazing portion connecting the heat transfer plates, and the brazing portion is damaged (the sealing performance is reduced). There is a fear. Moreover, when the space between the heat transfer plates is sealed with a gasket, the gasket may deteriorate due to the heat effect of high-pressure steam, and the sealing performance may be reduced.

JP 2002-106966 A

  Therefore, the present invention provides a heat exchange system and a heat exchange system operating method capable of maintaining the sealing performance between the heat transfer plates of the plate heat exchanger even when steam is employed as the first fluid. Is an issue.

  The present invention is a plate heat exchanger including a plurality of heat transfer plates stacked in a first direction, and the heat transfer plates are used as a boundary by sealing between adjacent heat transfer plates. The first flow path for flowing the fluid in the second direction orthogonal to the first direction and the second flow path for flowing the second fluid in the second direction are alternately formed in the first direction, and a plurality of transmission lines are formed. By connecting through holes provided in each of the heat plates, a first inflow path and a first outflow path that extend in the first direction and communicate only with the first flow path, respectively, extend in the first direction and each of the second inflow paths. A plate heat exchanger having a second inflow path and a second outflow path communicating with only the flow path, and a first supply piping system connected to the first inflow path, A first supply piping system for supplying steam as one fluid and a first outflow passage. A first discharge piping system for discharging the first fluid from the first outflow passage, and a first temperature sensing means for sensing the temperature of the first fluid flowing through the first discharge piping system. The first supply piping system includes an adjustment valve capable of adjusting the valve opening, and the adjustment valve adjusts the valve opening so that the detection result of the first temperature sensing means is lower than the liquefaction temperature of the steam. It is characterized by doing.

  According to the above configuration, the first supply piping system includes the adjustment valve capable of adjusting the valve opening degree, and the adjustment valve opens the valve opening degree so that the detection result of the first temperature sensing means is equal to or lower than the liquefaction temperature of the steam. Therefore, the first fluid discharged from the first discharge piping system is in a liquefied state (a state in which it is drained). That is, according to the above configuration, the steam as the first fluid can be discharged as a drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside.

  Since the steam as the first fluid can be discharged as drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, the flow path of the first fluid Is the resistance in the first flow path of the plate heat exchanger. Thereby, the pressure required in order to distribute | circulate a 1st fluid by a distribution channel can be set low.

  As described above, in the heat exchange system having the above-described configuration, the supply pressure of the first fluid can be lowered, so that the temperature of the first fluid flowing through the first flow path does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates of the plate heat exchanger from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  As one aspect of the present invention, a second supply piping system connected to the second inflow channel, the second supply piping system supplying the second fluid to the second inflow channel, and the second outflow channel A second discharge piping system for discharging the second fluid from the second outflow passage; and a second temperature sensing means for detecting the temperature of the second fluid flowing through the second discharge piping system. The first supply piping system further includes two regulating valves, and one of the two regulating valves is opened so that the sensing result of the first temperature sensing means is lower than the liquefaction temperature of the steam. The other adjustment valve of the two adjustment valves adjusts the valve opening so that the detection result of the second temperature detection means becomes the preset temperature of the second fluid after the heat exchange set in advance. You may make it adjust.

  According to the above configuration, the first supply piping system includes two regulating valves, and one of the two regulating valves is configured such that the sensing result of the first temperature sensing means is equal to or lower than the vapor liquefaction temperature. In order to adjust the valve opening, the first fluid discharged from the first discharge piping system is in a liquefied state (a state in which it has become drained). That is, according to the above configuration, the steam as the first fluid can be discharged as a drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside.

  And the other of the two regulating valves adjusts the valve opening so that the sensing result of the second temperature sensing means becomes the preset temperature of the second fluid after the preset heat exchange, The second fluid can be set to a preset temperature by heat exchange with the first fluid (steam) flowing through the first flow path so as to be drained in the first discharge piping system. That is, since the valve openings of the two regulating valves are adjusted according to the respective sensing results of the first temperature sensing means and the second temperature sensing means, the valve opening degrees of the two regulating valves are balanced. As a result, the first fluid is drained and discharged, while the second fluid is discharged at the set temperature.

  Since the steam as the first fluid can be discharged as drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, the flow path of the first fluid Is the resistance in the first flow path of the plate heat exchanger. Thereby, the pressure required in order to distribute | circulate a 1st fluid by a distribution channel can be set low.

  As described above, in the heat exchange system having the above-described configuration, the supply pressure of the first fluid can be lowered, so that the temperature of the first fluid flowing through the first flow path does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates of the plate heat exchanger from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  As another aspect of the present invention, a control unit, a second supply piping system connected to the second inflow channel, a second supply piping system for supplying a second fluid to the second inflow channel, and a second outflow channel A second discharge piping system connected to the second discharge piping system for discharging the second fluid from the second outflow passage, and a second temperature for sensing the temperature of the second fluid flowing through the second discharge piping system And a controller configured to set the second fluid after heat exchange in which the sensing result of the first temperature sensing means is lower than the liquefaction temperature of the vapor and the sensing result of the second temperature sensing means is preset. You may make it adjust a valve opening degree with respect to an adjustment valve so that it may become temperature.

  According to the above configuration, the control unit sets the second fluid set temperature after heat exchange in which the detection result of the first temperature sensing means is equal to or lower than the liquefaction temperature of the steam and the detection result of the second temperature sensing means is preset. The first fluid discharged from the first discharge piping system is in a liquefied state (in a drained state) while the second fluid is It is discharged at the set temperature.

  That is, the control unit controls the temperature state of the first fluid in the first discharge piping system and the temperature of the second fluid in the second discharge piping system in accordance with the respective sensing results of the first temperature sensing means and the second temperature sensing means. The valve opening of the regulating valve is adjusted so that the state is balanced.

  Since the steam as the first fluid can be discharged as drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, the flow path of the first fluid Is the resistance in the first flow path of the plate heat exchanger. Thereby, the pressure required in order to distribute | circulate a 1st fluid by a distribution channel can be set low.

  As described above, in the heat exchange system having the above-described configuration, the supply pressure of the first fluid can be lowered, so that the temperature of the first fluid flowing through the first flow path does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates of the plate heat exchanger from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  As another aspect of the present invention, the flow resistance of the flow path of the first fluid from the first inflow path to the first outflow path in the plate heat exchanger is greater on the first outflow path side than on the first inflow path side. Is preferred. In this way, the first fluid is appropriately retained (not allowed to pass through) in the first fluid flow path (first flow path) from the first inflow path to the first outflow path. Heat exchange efficiency with the circulating second fluid is increased. As a result, the first fluid (steam) can be reliably liquefied (to be drained).

  The operation method of the heat exchange system according to the present invention is a plate heat exchanger including a plurality of heat transfer plates stacked in the first direction, and heat transfer is performed by sealing between adjacent heat transfer plates. The first flow path for flowing the first fluid in the second direction orthogonal to the first direction and the second flow path for flowing the second fluid in the second direction alternately in the first direction with the plate as a boundary As the through holes provided in each of the plurality of heat transfer plates are formed, the first inflow path and the first outflow path that extend in the first direction and communicate with the first flow path, respectively, A plate-type heat exchanger having a second inflow path and a second outflow path that extend in one direction and communicates with the second flow path, and a first supply pipe that includes a regulating valve and is connected to the first inflow path Providing steam as the first fluid to the first inflow passage. In the operation method of the heat exchange system including the first supply piping system and the first discharge piping system connected to the first outflow passage, the first discharge piping system discharging the first fluid from the first outflow passage, First temperature sensing means for sensing the temperature of the first fluid senses the temperature of the first fluid flowing through the first discharge piping system over time, and the sensing result of the first temperature sensing means is less than the liquefaction temperature of the vapor And a step of adjusting the valve opening degree of the adjusting valve so as to become.

  According to the above method, the step of sensing the temperature of the first discharge piping system over time, and the step of adjusting the valve opening of the regulating valve so that the sensing result of the first temperature sensing means is lower than the liquefaction temperature of steam. Therefore, the first fluid discharged from the first discharge piping system is in a liquefied state (a state in which it is drained). That is, according to the above configuration, the steam as the first fluid can be discharged as a drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside.

  And since it is not necessary to provide a steam trap in the 1st discharge piping system (atmosphere release), the main resistance of the flow path of the 1st fluid turns into resistance in the 1st channel of a plate type heat exchanger. Thereby, the pressure required in order to distribute | circulate a 1st fluid by a distribution channel can be set low.

  Thus, in the above method, since the supply pressure of the first fluid can be lowered, the temperature of the first fluid flowing through the first flow path does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates of the plate heat exchanger from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  ADVANTAGE OF THE INVENTION According to this invention, even if steam is employ | adopted as a 1st fluid, the outstanding effect that the sealing performance between the heat exchanger plates of a plate type heat exchanger can be maintained can be show | played.

FIG. 1 is an overall schematic diagram of a heat exchange system according to a first embodiment of the present invention. FIG. 2 is an overall perspective view of the plate heat exchanger of the heat exchange system according to the first embodiment. FIG. 3 is an exploded perspective view of the plate heat exchanger of the heat exchange system according to the first embodiment. Drawing 4 is a figure for explaining the flow of the 1st fluid in the 1st channel of the heat exchange system concerning a first embodiment. FIG. 5 is a view for explaining the flow of the second fluid in the second flow path of the heat exchange system according to the first embodiment. FIG. 6 is an overall schematic diagram of a heat exchange system according to the second embodiment of the present invention. FIG. 7 is an overall schematic diagram of a heat exchange system according to the third embodiment of the present invention. FIG. 8 is a view for explaining the flow of the first fluid in the first flow path of the heat exchange system according to another embodiment of the present invention. FIG. 9 is a view for explaining the flow of the first fluid in the first flow path of the heat exchange system according to another embodiment of the present invention. FIG. 10 is a view for explaining the flow of the first fluid in the first flow path of the heat exchange system according to still another embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of a plate heat exchanger of a heat exchange system according to still another embodiment of the present invention. FIG. 12 is an overall schematic diagram of a heat exchange system according to still another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the heat exchange system according to the first embodiment of the present invention will be described. As shown in FIG. 1, the heat exchange system 1 according to the present embodiment includes a plate heat exchanger 2.

  As shown in FIGS. 2 and 3, the plate heat exchanger 2 includes a plurality of heat transfer plates 20. Each of the plurality of heat transfer plates 20 is a press-molded product of a metal plate. As shown in FIG. 3, each of the plurality of heat transfer plates 20 has a plurality of concave stripes (not numbered) and a plurality of convex stripes (not numbered) formed in the first direction (thickness direction). A surface and a second surface facing away from the first surface, and a plurality of ridges (not numbered) and a ridge and front and back of the first surface that are in a relationship between the front surface and the back surface of the first surface And a second surface on which a plurality of concave stripes (not numbered) are formed. The recesses and protrusions formed on the first surface and the second surface extend in a direction intersecting the second direction orthogonal to the first direction.

  Further, each of the plurality of heat transfer plates 20 has at least four through holes 200 penetrating in the first direction. In the present embodiment, each of the plurality of heat transfer plates 20 has a rectangular shape when viewed from the first direction, and has through holes 200 at each of four corners (four corners). That is, in the present embodiment, the heat transfer plate 20 has four through holes 200.

  The plurality of heat transfer plates 20 are overlapped in the first direction with the through-holes 200 aligned with each other. Specifically, each of the plurality of heat transfer plates 20 has the first surface opposed to the first surface of the adjacent heat transfer plate 20 and the second surface opposed to the second surface of the adjacent heat transfer plate 20. .

  In this state, the space between the outer peripheral ends of the adjacent heat transfer plates 20 is sealed (sealed). Moreover, the space | interval (cyclic area | region surrounding the through-hole 200) of the through-hole 200 of the adjacent heat-transfer plate 20 is sealed (sealed).

  Specifically, one of the two through holes 200 on the one end side in the second direction and the one of the two through holes 200 on the other end side in the second direction. About the circumference | surroundings of the hole 200, between the 2nd surfaces of the adjacent heat-transfer plate 20 is sealed. On the other hand, the periphery of the other through hole 200 of the two through holes 200 on one end side in the second direction and the other through hole of the two through holes 200 on the other end side in the second direction. About the circumference | surroundings of 200, between the 1st surfaces of the adjacent heat exchanger plates 20 is sealed.

  In the present embodiment, the plurality of heat transfer plates 20 are integrated by brazing. Thereby, in the plate type heat exchanger 2 of this embodiment, between the outer peripheral edge parts of the adjacent heat transfer plates 20 is sealed (sealed) by brazing, and the adjacent heat transfer plates 20 pass through. The space around the hole 200 is sealed (sealed) by brazing.

  Thus, by sealing between the adjacent heat transfer plates 20, the plate-type heat exchanger 2 has a first flow for flowing the first fluid A in the second direction with the heat transfer plate 20 as a boundary. The path R1 and the second flow path R2 through which the second fluid B flows in the second direction are alternately formed in the first direction. In addition, each of the four through holes 200 of the plurality of heat transfer plates 20 is continuous in the first direction. That is, the plate-type heat exchanger 2 includes a first inflow path Ra1 and a first outflow path Ra2 that extend in the first direction and communicate with only the first flow path R1, respectively, and extend in the first direction and extend in the second direction. A second inflow path Rb1 and a second outflow path Rb2 that are in communication only with the path R2 are formed.

  In the plate heat exchanger 2 according to the present embodiment, an upstream region (region on the first inflow channel Ra1 side) of the first flow channel R1 and a downstream region (region on the first outflow channel Ra2 side) of the first flow channel R1. The first fluid A is symmetric with respect to a center line extending in a third direction orthogonal to the first direction and the second direction, and the flow of the first fluid A in the first flow path R1 is configured as a trapezoidal flow. . Further, the upstream region (region on the second inflow channel Rb1 side) of the second channel R2 and the downstream region (region on the second outlet channel Rb2 side) of the second channel R2 are in the first direction and the second direction. The second fluid B is configured to have a trapezoidal flow in the second flow path R2 with reference to a center line extending in a third direction orthogonal to the reference line. Accordingly, the first flow path R1 and the second flow path R2 are line symmetric with respect to the center line extending in the second direction of the heat transfer plate 20.

  The heat exchange system 1 according to the present embodiment is a first supply piping system 3 connected to the first inflow path Ra1 as shown in FIG. 1 on the assumption that the plate heat exchanger 2 having the above configuration is provided. A first supply piping system 3 for supplying steam as the first fluid A to the first inflow channel Ra1 and a first discharge piping system 4 connected to the first outflow channel Ra2, and the first outflow channel Ra2 A first discharge piping system 4 for discharging one fluid A and a first temperature sensing means 7 for detecting the temperature of the first fluid A flowing through the first discharge piping system 4 are provided. Furthermore, the heat exchange system 1 according to the present embodiment is a second supply piping system 5 connected to the second inflow passage Rb1, and a second supply piping system that supplies the second fluid B to the second inflow passage Rb1. 5 and a second discharge piping system 6 that is connected to the second outflow passage Rb2 and discharges the second fluid B from the second outflow passage Rb2.

  The first supply piping system 3 connects a supply source (not shown) of the first fluid A and the plate heat exchanger 2 (first inflow path Ra1). That is, the first supply piping system 3 defines a flow path (distribution path) that connects the supply source of the first fluid A and the first inflow path Ra1 of the plate heat exchanger 2. In the present embodiment, the first fluid A is steam. In connection with this, the 1st supply piping system 3 leads to the boiler (not shown) which is a generation source (supply source) of the 1st fluid A (steam).

  The first supply piping system 3 includes an adjustment valve 30 that can adjust the valve opening degree. In the present embodiment, the first supply piping system 3 further includes an on-off valve 31 for opening and closing the flow path.

  The regulating valve 30 and the on-off valve 31 are arranged at a midpoint position in the first supply piping system 3. In the present embodiment, the on-off valve 31 is disposed on the downstream side of the regulating valve 30.

  The adjustment valve 30 includes a valve body 300 that can adjust the valve opening degree and an actuator 301 that changes the valve opening degree of the valve body 300.

  In the present embodiment, the valve body 300 includes a housing (not numbered) that defines a flow path that communicates the upstream side and the downstream side, and a valve seat (not shown) that is disposed in the middle of the flow path of the housing. And a valve body (not shown) that can contact and separate from the valve seat. The valve main body 300 according to the present embodiment brings the valve body into contact with and separates from the valve seat (changes the distance (valve opening) between the valve body and the valve seat), whereby the flow rate of the first fluid A ( This is a so-called flow rate adjusting valve that adjusts the amount of steam supplied. In addition, various valves, such as a globe valve and a needle valve, can be employed for the valve body 300, and in this embodiment, a globe valve is employed.

  The actuator 301 is an operation shaft (not numbered) extending in the direction of contact and separation of the valve body with respect to the valve seat. The operation shaft is connected to the valve body, and the operation shaft receives temperature sensing by the first temperature sensing means 7. And an actuating part (not numbered) for moving in the axial direction.

  The actuator 301 is a pressure receiving portion (not shown) connected to the operating shaft, and receives the pressure of the fluid, and biases the pressure receiving portion in a direction opposite to the direction in which the fluid pressure acts. A biasing member (not shown). The position of the pressure receiving portion can be adjusted in the axial direction of the operation shaft. The position of the pressure receiving unit whose position is adjusted determines the valve opening. That is, the position of the pressure-receiving portion whose position has been adjusted determines the reference valve opening (initial valve opening), and accordingly, the supply amount serving as the reference for the first fluid A is determined.

  The actuator 301 moves the valve body according to the temperature of the first fluid A flowing through the first discharge piping system 4. In this embodiment, the actuator 301 is interlocked with the temperature sensing of the first temperature sensing means 7, and the temperature of the first fluid A flowing through the first discharge piping system 4 is equal to or lower than the liquefaction temperature of the first fluid A (steam). The valve opening of the valve body 300 is changed so that

  In the present embodiment, since the first fluid A is steam, the liquefaction temperature of the first fluid A is 100 ° C. on the assumption that the heat exchange system 1 is installed under atmospheric pressure. Therefore, the actuator 301 changes the valve opening degree of the valve body 300 so that the temperature of the first fluid A flowing through the first discharge piping system 4 becomes 100 ° C. or less. In the present embodiment, the actuator 301 is such that the temperature of the first fluid A flowing through the first discharge piping system 4 is lower than the liquefaction temperature of the first fluid A (temperature lower than the temperature at which steam becomes drained). The valve opening degree of the valve body 300 is changed so as to become (for example, 99 ° C. or less).

  The on-off valve 31 is a valve that can switch between flow and block of the first fluid A. Accordingly, various types such as a ball valve, a gate valve, a globe valve, and a needle valve can be adopted as the on-off valve 31.

  The first discharge piping system 4 is open to the atmosphere. That is, the 1st discharge piping system 4 is piping from the plate type heat exchanger 2 (1st outflow path Ra2) to the discharge position (not shown) of the 1st fluid A, and a flow path (space) has full length. Communicate. In addition, the 1st discharge piping system 4 presupposes that the atmosphere is open | released (the valve opening degree is not adjusted) in the condition which heat-exchanges the 1st fluid A and the 2nd fluid B with the plate-type heat exchanger 2. In addition, similarly to the first supply piping system 3, an on-off valve for opening and closing the flow path may be provided.

  In this embodiment, the 2nd supply piping system 5 is connected to the storage tank T which stores the 2nd fluid B, and the 2nd discharge piping system 6 is installed so that the 2nd fluid B can be supplied to the storage tank T. . Either the second supply piping system 5 or the second discharge piping system 6 includes a pump P.

  When the second supply piping system 5 includes the pump P, the pump P draws the second fluid B from the storage tank T and sends the second fluid B to the plate heat exchanger 2 (second inflow path Rb1). When the second discharge piping system 6 includes the pump P, the pump P draws the second fluid B from the plate heat exchanger 2 (second outflow path Rb2), and the second fluid B Is a pump for feeding the water into the storage tank T. Here, the second supply piping system 5 includes a pump P.

  Thereby, the heat exchange system 1 which concerns on this embodiment makes the 2nd fluid B (for example, water) into the storage tank T, the 2nd supply piping system 5, the plate-type heat exchanger 2 (2nd inflow path Rb1, the 1st). Heat is exchanged with the first fluid A flowing through the first flow path R1 in the plate heat exchanger 2 while circulating through the two flow paths R2, the second outflow path Rb2) and the second discharge piping system 6 (this embodiment) In the form, it is heated by the first fluid A).

  The first temperature sensing means 7 is attached to the first discharge piping system 4 and senses the temperature (heat) of the first fluid A flowing through the first discharge piping system 4 over time. Specifically, the first temperature sensing unit 7 senses a temperature (heat) of the first fluid A, and a sensing result transmission unit 71 that transmits a sensing result by the sensing unit 70 to the first regulating valve 30. And have.

  In the present embodiment, a gas that expands and contracts under the influence of heat is enclosed in the sensing unit 70 of the first temperature sensing means 7. The sensing unit 70 of the first temperature sensing means 7 is attached to the first discharge piping system 4 in a state of being positioned in the flow path of the first discharge piping system 4. Thereby, the sensing unit 70 receives the heat of the first fluid A, and expands and contracts the sealed gas according to the temperature of the heat.

  As the first temperature sensing unit 7 employs a sensing unit 70 that encloses a gas that expands and contracts, the sensing result transmission unit 71 is configured by a tube with a gas having poor compressibility inside. The sensing result transmitting means (tube) 71 has a first end in the longitudinal direction and a second end opposite to the first end. The first end of the sensing result transmission means 71 is fluidly connected to the sensing unit 70, and the second end of the sensing result transmission means 71 is fluidly connected to the operating part of the first regulating valve 30.

  As a result, when the gas in the sensing unit 70 expands, the gas in the sensing result transmission means (tube) 71 is pushed toward the operating part of the actuator 301 to pressurize the pressure receiving part of the operating part, while the sensing part 70 When the gas is contracted, the gas in the sensing result transmitting means (tube) 71 is drawn toward the sensing unit 70 side, and the pressurization to the pressure receiving unit is gradually released.

  In the operating portion of the actuator 301, the pressure receiving portion moves the operating shaft in the axial direction, and moves the valve body (contacts and separates from the valve seat). That is, since the gas in the sensing unit 70 expands or contracts in accordance with the temperature of the first fluid A, the gas in the sensing result transmission means (tube) 71 is accompanied with the expansion or contraction of the gas in the sensing unit 70. Also moves corresponding to the temperature of the first fluid A.

  In the first adjustment valve 30, the pressure receiving portion of the operating portion moves according to the pressurization (pressure receiving) state by the gas in the sensing result transmission means (tube) 71. The connected valve bodies also move according to the temperature of the first fluid A. Thereby, the state of the gas sealed in the sensing unit 70 is in a state where the temperature of the first fluid A flowing through the first discharge piping system 4 corresponds to a preset temperature (below the liquefaction temperature of steam). The valve opening degree of the first adjustment valve 30 is adjusted. That is, in the heat exchange system 1 according to the present embodiment, the first adjustment valve 30 and the first temperature sensing means 7 are automatic temperature adjustment valves that adjust the temperature of the first fluid A flowing through the first discharge piping system 4. It is composed.

  The heat exchange system 1 according to the present embodiment is as described above, and the second fluid B is circulated by driving the pump P. At the same time, the on-off valve 31 is opened, and the first fluid A is supplied from the supply source to the plate heat exchanger 2. In this state, as shown in FIG. 4, the first fluid A flows into the first flow path R1 from the first inflow path Ra1, flows through the first flow path R1 in the second direction, and is discharged to the first outflow path Ra2. . On the other hand, as shown in FIG. 5, the second fluid B flows into the second flow path R2 from the second inflow path Rb1, flows through the second flow path R2 in the second direction, and enters the second outflow path Rb2. Discharged.

  Then, the first fluid A that flows through the first flow path R1 and the second fluid B that flows through the second flow path R2 exchange heat through the heat transfer plate 20. Thereby, the 2nd fluid B which distribute | circulates 2nd flow path R2 receives the heat of the 1st fluid A (steam), and is heated. On the other hand, the steam that is the first fluid A is condensed and drained toward the first outflow path Ra2 as a result of the heat deprived by the second fluid B.

  In this state, there is a possibility that the supplied first fluid A (steam) may not be completely drained. In this embodiment, as shown in FIG. 1, the first temperature sensing means 7 is connected to the first discharge piping system. 4, the temperature (heat) of the first fluid A flowing through 4 is sensed, and the regulating valve 30 receives the sensing result of the first temperature sensing means 7, and the supply amount (heat amount) of the first fluid A in the first supply piping system 3. Adjust. That is, the regulating valve 30 is configured so that the temperature of the first fluid A flowing through the first discharge piping system 4 is equal to or lower than the liquefaction temperature of the first fluid A (less than the temperature at which steam becomes drained). Adjust the supply amount.

  Therefore, the first fluid A (steam) is completely liquefied in the state of flowing through the first discharge piping system 4 and is discharged from the first discharge piping system 4 as drain.

  As described above, the heat exchange system 1 according to the present embodiment is a plate heat exchanger 2 including a plurality of heat transfer plates 20 stacked in the first direction, and a seal is provided between adjacent heat transfer plates 20. Thus, with the heat transfer plate 20 as a boundary, the first flow path R1 that circulates the first fluid A in the second direction orthogonal to the first direction, and the second circulates the second fluid B in the second direction. The flow paths R2 are alternately formed in the first direction, and the through holes 200 provided in each of the plurality of heat transfer plates 20 are connected, so that each extends in the first direction to the first flow path R1. Plate-type heat exchange in which a first inflow path Ra1 and a first outflow path Ra2 that communicate with each other and a second inflow path Rb1 and a second outflow path Rb2 that extend in the first direction and communicate with the second flow path R2 are formed. 2 and the first inflow channel Ra1 A first supply piping system 3 connected to the first supply piping system 3 for supplying steam as the first fluid A to the first inflow passage Ra1, and a first discharge piping system connected to the first outflow passage Ra2. 4, a first discharge piping system 4 for discharging the first fluid A from the first outflow passage Ra2, and a first temperature sensing means 7 for detecting the temperature of the first fluid A flowing through the first discharge piping system 4. The first supply piping system 3 includes an adjustment valve 30 that can adjust the valve opening degree, and the adjustment valve 30 is opened so that the detection result of the first temperature detection means 7 is lower than the liquefaction temperature of the steam. Adjust the degree.

  According to the said structure, the 1st supply piping system 3 contains the adjustment valve 30 which can adjust a valve opening degree, and the adjustment valve 30 makes the detection result of the 1st temperature detection means 7 become below the liquefaction temperature of steam. In order to adjust the valve opening, the first fluid A discharged from the first discharge piping system 4 is in a liquefied state (a state in which it is drained). That is, according to the above configuration, the steam as the first fluid A can be discharged as a drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside.

  Since the steam as the first fluid A can be drained and discharged without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, The main resistance of the flow path is the resistance in the first flow path R1 of the plate heat exchanger 2. Thereby, the pressure required in order to distribute | circulate the 1st fluid A by a distribution channel can be set low.

  Thus, in the heat exchange system 1 having the above-described configuration, the supply pressure of the first fluid A can be lowered, and therefore the temperature of the first fluid A flowing through the first flow path R1 does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates 20 of the plate heat exchanger 2 from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  Next, a heat exchange system according to a second embodiment of the present invention will be described. In addition, since the heat exchange system according to the present embodiment has the same configuration as the configuration of the heat exchange system according to the first embodiment or a corresponding configuration, it is the same as the configuration of the heat exchange system according to the first embodiment. The same name and the same reference numeral are assigned to the configuration or the corresponding configuration, and for the same configuration as the configuration of the heat exchange system according to the first embodiment, the description of the first embodiment is cited. To do. Therefore, only the configuration different from the heat exchange system 1 of the first embodiment will be described here.

  As shown in FIG. 6, in the heat exchange system 1 according to the present embodiment, the plate heat exchanger 2 is the same as that in the first embodiment. On the premise of this, the heat exchange system 1 includes a first supply piping system 3, a first discharge piping system 4, a second supply piping system 5, and a second discharge piping system 6. Furthermore, in addition to the first temperature sensing means 7, the heat exchange system 1 includes second temperature sensing means 8 that senses the temperature of the second fluid B flowing through the second discharge piping system 6.

  The first supply piping system 3 includes two regulating valves 30 and 32. The two regulating valves 30 and 32 are arranged on the upstream side of the on-off valve 31. In the following description, one of the two regulating valves 30 is referred to as a first regulating valve, and the other regulating valve 32 of the two regulating valves 30 is referred to as a second regulating valve. .

  The first adjustment valve 30 has the same configuration as the adjustment valve 30 of the first embodiment, and adjusts the valve opening according to the sensing result of the first temperature sensing means 7. That is, the purpose of installing the first regulating valve 30 is the same as the purpose of installing the regulating valve 30 of the first embodiment.

  The mechanical configuration of the second adjustment valve 32 is the same as the mechanical configuration of the first adjustment valve 30, but the purpose (function) to be installed is different. explain.

  The second adjustment valve 32 includes a valve body 320 that can adjust the valve opening degree, and an actuator 321 that changes the valve opening degree of the valve body 320.

  The valve body 320 of the second regulating valve 32 includes a housing (not numbered) that defines a flow path that allows the upstream side and the downstream side to communicate with each other, and a valve seat (not shown) that is disposed in the middle of the flow path of the housing. And a valve body (not shown) that can contact and separate from the valve seat. The valve body 320 according to the present embodiment causes the valve body to contact and separate from the valve seat (changes the distance (valve opening) between the valve body and the valve seat), thereby allowing the first fluid A to flow ( This is a so-called flow rate adjusting valve that adjusts the amount of steam supplied. In addition, various valves, such as a globe valve and a needle valve, can be employed for the valve body 320, and a globe valve is employed in the present embodiment.

  The actuator 321 of the second adjustment valve 32 moves the valve body according to the temperature of the second discharge piping system 6 (the discharged second fluid B). In the present embodiment, the actuator 321 is interlocked with the temperature sensing of the second temperature sensing means 8 so that the temperature of the second fluid B flowing through the second discharge piping system 6 becomes a preset temperature. Change the valve opening.

  More specifically, the actuator 321 of the second adjustment valve 32 is an operation shaft extending in the contact / separation direction of the valve body with respect to the valve seat, and is constituted by the operation shaft connected to the valve body and the second temperature sensing means 8. And an operating unit that moves the operating shaft in the axial direction in response to temperature sensing.

  In the second regulating valve 32, the actuator 321 includes a pressure receiving portion (not shown) connected to the operating shaft, and a biasing member (not shown) that biases the pressure receiving portion in a direction opposite to the direction of fluid pressure. Not). The position of the pressure receiving portion can be adjusted in the axial direction of the operation shaft. The position of the pressure receiving unit whose position is adjusted determines the valve opening. That is, the position of the pressure-receiving portion whose position has been adjusted determines the reference valve opening (initial valve opening), and accordingly, the supply amount serving as the reference for the first fluid A is determined.

  The first temperature sensing means 7 senses the temperature of the first fluid A flowing through the first discharge piping system 4 over time. The first temperature sensing means 7 is the same as the first temperature sensing means 7 of the first embodiment, the sensing unit 70 is attached to the first discharge piping system 4, and the sensing result transmitting means 71 is the first regulating valve 30. It is fluidly connected to the working part.

  The mechanical configuration of the second temperature sensing means 8 is the same as the mechanical configuration of the first temperature sensing means 7, but the second temperature sensing means 8 and the purpose (function) to be installed are different. The configuration of the temperature sensing means 8 will be specifically described.

  The second temperature sensing means 8 is attached to the second discharge piping system 6 and senses the temperature (heat) of the second fluid B flowing through the second discharge piping system 6. Specifically, the second temperature sensing unit 8 senses a temperature (heat) of the second fluid B, and a sensing result transmission unit 81 that transmits a sensing result by the sensing unit 80 to the second regulating valve 32. And have.

  The sensing unit 80 of the second temperature sensing means 8 senses the temperature of the second fluid B flowing through the second discharge piping system 6 over time. In the present embodiment, a gas that expands and contracts under the influence of heat is enclosed in the sensing unit 80 of the second temperature sensing means 8. The sensing unit 80 of the second temperature sensing means 8 is attached to the second discharge piping system 6 in a state of being positioned in the flow path of the second discharge piping system 6. Thereby, the sensing unit 80 receives the heat of the second fluid B, and expands and contracts the sealed gas according to the temperature of the heat.

  As the second temperature sensing unit 8 employs a sensing unit 80 that encloses a gas that expands and contracts, the sensing result transmission unit 81 is configured by a tube with a gas having poor compressibility inside. The sensing result transmission means (tube) 81 has a first end in the longitudinal direction and a second end opposite to the first end. The first end of the sensing result transmission means 81 is fluidly connected to the sensing unit 80, and the second end of the sensing result transmission means 81 is fluidly connected to the operating part of the second regulating valve 32.

  Thus, when the gas in the sensing unit 80 expands, the gas in the sensing result transmission means (tube) 81 is pushed toward the operating part of the actuator 321 to pressurize the pressure receiving part of the operating part, while the sensing part 80 When the gas contracts, the gas in the sensing result transmission means (tube) 81 is drawn toward the sensing unit 80, and the pressure on the pressure receiving unit is gradually released.

  In the operating portion of the actuator 321, the pressure receiving portion moves the operating shaft in the axial direction and moves the valve body (contacts and separates from the valve seat). That is, since the gas in the sensing unit 80 expands or contracts in accordance with the temperature of the second fluid B, the gas in the sensing result transmission means (tube) 81 is accompanied with the expansion or contraction of the gas in the sensing unit 80. Also moves in correspondence with the temperature of the second fluid B.

  In the second adjustment valve 32, the pressure receiving portion of the operating portion moves in accordance with the pressurization (pressure receiving) state by the gas in the sensing result transmitting means (tube) 81. The connected valve bodies also move according to the temperature of the second fluid B. Thereby, the state of the gas sealed in the sensing unit 80 is in a state in which the temperature of the second fluid B flowing through the second discharge piping system 6 corresponds to the preset heating temperature. The valve opening is adjusted. That is, in the heat exchange system 1 according to the present embodiment, the second adjustment valve 32 and the second temperature sensing means 8 are automatic temperature adjustment valves that adjust the temperature of the second fluid B flowing through the second discharge piping system 6. It is composed.

  The heat exchange system 1 according to the present embodiment is as described above, and the second fluid B is circulated by driving the pump P. At the same time, the on-off valve 31 is opened, and the first fluid A is supplied from the supply source to the plate heat exchanger 2. In this state, the first fluid A flows into the first flow path R1 from the first inflow path Ra1, flows through the first flow path R1 in the second direction, and is discharged to the first outflow path Ra2. On the other hand, the second fluid B flows into the second flow path R2 from the second inflow path Rb1, flows through the second flow path R2 in the second direction, and is discharged to the second outflow path Rb2.

  Then, the first fluid A that flows through the first flow path R1 and the second fluid B that flows through the second flow path R2 exchange heat through the heat transfer plate 20. Thereby, the 2nd fluid B which distribute | circulates 2nd flow path R2 receives the heat of the 1st fluid A (steam), and is heated. On the other hand, the steam that is the first fluid A is condensed and drained toward the first outflow path Ra2 as a result of the heat deprived by the second fluid B.

  In this state, there is a possibility that the supplied first fluid A (steam) may not be completely drained. In this embodiment, the first temperature sensing means 7 is the first that circulates through the first discharge piping system 4. The temperature (heat) of the fluid A is detected, and the first adjustment valve 30 adjusts the supply amount (heat amount) of the first fluid A in the first supply piping system 3 in response to the detection result. That is, the first regulating valve 30 is configured so that the temperature of the first fluid A flowing through the first discharge piping system 4 is equal to or lower than the liquefaction temperature of the first fluid A (less than the temperature at which steam becomes drained). The supply amount of fluid A is adjusted.

  Accordingly, the first fluid A (steam) supplied to the first flow path R1 is completely liquefied in the state of flowing through the first discharge piping system 4, and is discharged as drain from the first discharge piping system 4. .

  In the heat exchange system 1 of the present embodiment, the second temperature sensing means 8 senses the temperature (heat) of the second fluid B flowing through the second discharge piping system 6 and receives the sensing result to make a second adjustment. The valve 32 adjusts the supply amount (heat amount) of the first fluid A in the first supply piping system 3. That is, the second adjustment valve 32 adjusts the supply amount of the first fluid A so that the temperature of the second fluid B flowing through the second discharge piping system 6 becomes a preset heating temperature.

  As described above, in the heat exchange system 1 according to the present embodiment, each of the first adjustment valve 30 and the second adjustment valve 32 adjusts the flow rate of the first fluid A. However, the temperature of the second fluid B flowing through the second discharge piping system 6 is preset by the first adjusting valve 30 adjusting the valve opening degree in accordance with the detection result of the first temperature sensing means 7. If it deviates from, the 2nd adjustment valve 32 will adjust a valve opening according to the sensing result of the 2nd temperature sensing means 8. Moreover, the temperature of the 1st fluid A which distribute | circulates the 1st discharge piping system 4 exceeds the liquefaction temperature because the 2nd adjustment valve 32 adjusts a valve opening degree according to the detection result of the 2nd temperature detection means 8. If it does so, the 1st adjustment valve 30 will adjust a valve opening according to the sensing result of the 1st temperature sensing means 7. FIG.

  That is, the first regulating valve 30 and the second regulating valve 32 are finally balanced by complementing each other's valve opening state, and the first inflow from the first supply piping system 3. The flow rate of the first fluid A flowing into the path Ra1 is such that the temperature of the first fluid A flowing through the first discharge piping system 4 is equal to or lower than the liquefaction temperature and the temperature of the second fluid B flowing through the second discharge piping system 6 is The flow rate becomes a preset temperature.

  As described above, the heat exchange system 1 according to the present embodiment is a plate heat exchanger 2 including a plurality of heat transfer plates 20 stacked in the first direction, and a seal is provided between adjacent heat transfer plates 20. Thus, with the heat transfer plate 20 as a boundary, the first flow path R1 that circulates the first fluid A in the second direction orthogonal to the first direction, and the second circulates the second fluid B in the second direction. The flow paths R2 are alternately formed in the first direction, and the through holes 200 provided in each of the plurality of heat transfer plates 20 are connected, so that each extends in the first direction to the first flow path R1. Plate-type heat exchange in which a first inflow path Ra1 and a first outflow path Ra2 that communicate with each other and a second inflow path Rb1 and a second outflow path Rb2 that extend in the first direction and communicate with the second flow path R2 are formed. 2 and the first inflow channel Ra1 A first supply piping system 3 connected to the first supply piping system 3 for supplying steam as the first fluid A to the first inflow passage Ra1, and a first discharge piping system connected to the first outflow passage Ra2. 4, a first discharge piping system 4 for discharging the first fluid A from the first outflow passage Ra2, and a first temperature sensing means 7 for detecting the temperature of the first fluid A flowing through the first discharge piping system 4. The second supply piping system 5 connected to the second inflow passage Rb1, the second supply piping system 5 supplying the second fluid B to the second inflow passage Rb1, and the second outflow passage Rb2. A second discharge piping system 6 for detecting the temperature of the second discharge piping system 6 for discharging the second fluid B from the second outflow passage Rb2 and the second fluid B flowing through the second discharge piping system 6; The first supply piping system 3 includes two regulating valves 30, and the two regulating valves 30 are connected to each other. One adjustment valve 30 (first adjustment valve 30) adjusts the valve opening so that the detection result of the first temperature sensing means 7 is lower than the liquefaction temperature of the steam, and the other of the two adjustment valves 30 The adjustment valve 32 (second adjustment valve 32) adjusts the valve opening so that the detection result of the second temperature detection means 8 becomes a preset temperature of the second fluid B after heat exchange set in advance.

  According to the above configuration, the first supply piping system 3 includes two regulating valves 30, and one regulating valve 30 (the first regulating valve 30) of the two regulating valves 30 is the first temperature sensing means 7. Therefore, the first fluid A discharged from the first discharge piping system 4 is in a liquefied state (drained state). That is, according to the above configuration, the steam as the first fluid A can be discharged as a drain without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside.

  Then, the other adjustment valve 32 (second adjustment valve 32) of the two adjustment valves 30 is set to the set temperature of the second fluid B after the heat exchange in which the detection result of the second temperature detection means 8 is set in advance. In order to adjust the valve opening degree, the second fluid B is set in advance by heat exchange with the first fluid A (steam) flowing in the first flow path R1 so as to be drained in the first discharge piping system 4. Temperature.

  That is, the valve openings of the two regulating valves 30 and 32 (the first regulating valve 30 and the second regulating valve 32) are adjusted according to the respective sensing results of the first temperature sensing means 7 and the second temperature sensing means 8. Therefore, the valve opening degree of the two regulating valves 30, 32 (the first regulating valve 30 and the second regulating valve 32) is balanced. As a result, the first fluid A is drained and discharged, while the second fluid B is discharged at the set temperature.

  Since the steam as the first fluid A can be drained and discharged without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, The main resistance of the flow path is the resistance in the first flow path R1 of the plate heat exchanger 2. Thereby, the pressure required in order to distribute | circulate the 1st fluid A by a distribution channel can be set low.

  Thus, in the heat exchange system 1 having the above-described configuration, the supply pressure of the first fluid A can be lowered, and therefore the temperature of the first fluid A flowing through the first flow path R1 does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates 20 of the plate heat exchanger 2 from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  Next, a heat exchange system according to a third embodiment of the present invention will be described. In addition, since the heat exchange system according to the present embodiment has the same configuration as the configuration of the heat exchange system according to the first embodiment or a corresponding configuration, it is the same as the configuration of the heat exchange system according to the first embodiment. The same name and the same reference numeral are assigned to the configuration or the corresponding configuration, and for the same configuration as the configuration of the heat exchange system according to the first embodiment, the description of the first embodiment is cited. To do. Therefore, only the configuration different from the heat exchange system 1 of the first embodiment will be described here.

  As shown in FIG. 7, in the heat exchange system 1 according to the present embodiment, the plate heat exchanger 2 is the same as that in the first embodiment. On the premise of this, the heat exchange system 1 includes a first supply piping system 3, a first discharge piping system 4, a second supply piping system 5, and a second discharge piping system 6. In addition to the first temperature sensing means 7, the heat exchange system 1 is provided with a second temperature sensing means 8 for sensing the temperature of the second fluid B flowing through the second discharge piping system 6 and a control unit 9. .

  In the first supply piping system 3, the adjustment valve 30 is disposed on the upstream side of the on-off valve 31. The adjustment valve 30 includes a valve body 300 that can adjust the valve opening degree and an actuator 301 that changes the valve opening degree of the valve body 300.

  In the present embodiment, the valve body 300 includes a housing (not numbered) that defines a flow path that communicates the upstream side and the downstream side, and a valve seat (not shown) that is disposed in the middle of the flow path of the housing. And a valve body (not shown) that can contact and separate from the valve seat. The valve main body 300 according to the present embodiment brings the valve body into contact with and separates from the valve seat (changes the distance (valve opening) between the valve body and the valve seat), whereby the flow rate of the first fluid A ( This is a so-called flow rate adjusting valve that adjusts the amount of steam supplied. Various types of valves such as a globe valve and a needle valve can be employed for the valve body 300, and in this embodiment, a globe valve is employed.

  The actuator 301 includes an electric motor M. Such an actuator 301 is driven by the electric motor M in accordance with the temperature of the first fluid A flowing through the first discharge piping system 4 and the temperature of the second fluid B flowing through the second discharge piping system 6. Move the disc. In the present embodiment, the actuator 301 circulates through the second discharge piping system 6 when the temperature of the first fluid A flowing through the first discharge piping system 4 is equal to or lower than the liquefaction temperature of the steam based on an instruction from the control unit 9. The valve opening degree of the valve main body 300 is changed so that the temperature of the second fluid B to be set becomes the preset temperature of the second fluid B after heat exchange set in advance.

  The first temperature sensing means 7 is attached to the first discharge piping system 4 and senses the temperature (heat) of the first fluid A flowing through the first discharge piping system 4 over time. Specifically, the first temperature sensing unit 7 includes a sensing unit 70 that senses the temperature (heat) of the first fluid A, and a sensing result transmission unit 71 that transmits a sensing result by the sensing unit 70 to the control unit 9. Have.

  In the first temperature sensing means 7, the sensing unit 70 senses the temperature of the first fluid A flowing through the first discharge piping system 4 over time. In the present embodiment, the sensing unit 70 is a temperature sensor, and the sensing result transmission unit 71 is a communication line that electrically connects the sensing unit 70 and the control unit 9.

  The second temperature sensing means 8 is attached to the second discharge piping system 6 and senses the temperature (heat) of the second fluid B flowing through the second discharge piping system 6. Specifically, the second temperature sensing unit 8 includes a sensing unit 80 that senses the temperature (heat) of the second fluid B, and a sensing result transmission unit 81 that transmits a sensing result by the sensing unit 80 to the control unit 9. Have.

  In the second temperature sensing means 8, the sensing unit 80 senses the temperature of the second fluid B flowing through the second discharge piping system 6 over time. The sensing unit 80 is a temperature sensor, and the sensing result transmission unit 81 is a communication line that electrically connects the sensing unit 80 and the control unit 9.

  The controller 9 is electrically connected to the first temperature sensing means 7 and the second temperature sensing means 8 as described above. The control unit 9 is electrically connected to the actuators 301 and 321 of the regulating valve 30 via communication lines 90 and 91.

  The control unit 9 controls the operating unit (electric motor M) of the regulating valve 30 so that the sensing result of the first temperature sensing means 7 is lower than the liquefaction temperature of the steam and the sensing result of the second temperature sensing means 8 is preset. The valve opening is adjusted by the adjustment valve 30 so that the set temperature of the second fluid B after the heat exchange is performed.

  As described above, the heat exchange system 1 according to the present embodiment is a plate heat exchanger 2 including a plurality of heat transfer plates 20 stacked in the first direction, and a seal is provided between adjacent heat transfer plates 20. Thus, with the heat transfer plate 20 as a boundary, the first flow path R1 that circulates the first fluid A in the second direction orthogonal to the first direction, and the second circulates the second fluid B in the second direction. The flow paths R2 are alternately formed in the first direction, and the through holes 200 provided in each of the plurality of heat transfer plates 20 are connected, so that each extends in the first direction to the first flow path R1. Plate-type heat exchange in which a first inflow path Ra1 and a first outflow path Ra2 that communicate with each other and a second inflow path Rb1 and a second outflow path Rb2 that extend in the first direction and communicate with the second flow path R2 are formed. 2 and the first inflow channel Ra1 A first supply piping system 3 connected to the first supply piping system 3 for supplying steam as the first fluid A to the first inflow passage Ra1, and a first discharge piping system connected to the first outflow passage Ra2. 4, a first discharge piping system 4 for discharging the first fluid A from the first outflow passage Ra2, and a first temperature sensing means 7 for detecting the temperature of the first fluid A flowing through the first discharge piping system 4. The second supply piping system 5 connected to the control unit 9 and the second inflow passage Rb1, the second supply piping system 5 supplying the second fluid B to the second inflow passage Rb1, and the second outflow passage. A second discharge piping system 6 connected to Rb2 for discharging the second fluid B from the second outflow passage Rb2, and a second fluid B flowing through the second discharge piping system 6. Second temperature sensing means 8 for sensing temperature, and the first supply piping system 3 includes an adjustment valve 30 capable of adjusting the valve opening degree. Thus, the first discharge piping system 4 is opened to the atmosphere, and the control unit 9 sets the detection result of the second temperature detection means 8 in advance so that the detection result of the first temperature detection means 7 is lower than the liquefaction temperature of the steam. Then, the valve opening degree is adjusted by the adjustment valve 30 so as to be the set temperature of the second fluid B after the heat exchange.

  According to the above configuration, the control unit 9 allows the second fluid after heat exchange in which the sensing result of the first temperature sensing means 7 is equal to or lower than the liquefaction temperature of the steam and the sensing result of the second temperature sensing means 8 is set in advance. In order to allow the regulating valve 30 to adjust the valve opening so as to reach the set temperature of B, the first fluid A discharged from the first discharge piping system 4 is in a liquefied state (a state in which it is drained), The second fluid B reaches the set temperature and is discharged.

  That is, the control unit 9 responds to the respective sensing results of the first temperature sensing means 7 and the second temperature sensing means 8 and the temperature state of the first fluid A in the first discharge piping system 4 and the second discharge piping system 6. The valve opening degree of the regulating valve 30 is adjusted so that the temperature state of the second fluid B is balanced.

  Since the steam as the first fluid A can be drained and discharged without providing a steam trap for selectively discharging only the drain without discharging the steam to the outside, The main resistance of the flow path is the resistance in the first flow path R1 of the plate heat exchanger 2. Thereby, the pressure required in order to distribute | circulate the 1st fluid A by a distribution channel can be set low.

  Thus, in the heat exchange system 1 having the above-described configuration, the supply pressure of the first fluid A can be lowered, and therefore the temperature of the first fluid A flowing through the first flow path R1 does not become higher than necessary. Therefore, it is possible to suppress the seal between the heat transfer plates 20 of the plate heat exchanger 2 from being thermally affected (stress concentration due to thermal expansion, deterioration due to heating, etc.).

  As described above, in the heat exchange system 1 according to any of the above embodiments, even when steam is used as the first fluid A, the sealing performance between the heat transfer plates 20 of the plate heat exchanger 2 is maintained. It is possible to achieve an excellent effect that

  Note that the present invention is not limited to any of the above-described embodiments, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

  In the plate heat exchanger 2 of each of the above embodiments, the upstream region of the first flow path R1 (region on the first inflow channel Ra1 side) and the downstream region of the first flow channel R1 (region on the first outflow channel Ra2 side) The first fluid A is symmetric with respect to the center line extending in the third direction orthogonal to the first direction and the second direction, and the flow of the first fluid A is a trapezoidal flow in the first flow path R1. It is not limited to this. For example, in the plate heat exchanger 2, the upstream region (region on the first inflow channel Ra1 side) of the first channel R1 and the downstream region (region on the first outlet channel Ra2 side) of the first channel R1 are The first fluid A may be configured to be rotationally symmetric with respect to a center line extending in the direction so that the flow of the first fluid A is an oblique flow in the first flow path R1. The same applies to the second flow path R2. In this case as well, the first flow path R1 and the second flow path R2 may be axisymmetric with respect to the center line of the heat transfer plate 20 extending in the second direction.

  In each of the above embodiments, the flow of the first fluid A in the first flow path R1 of the plate heat exchanger 2 is configured to be a trapezoidal flow, and the flow resistance of the first fluid A in the first flow path R1 is Although it was made smaller in the middle flow area of one flow path R1 than an upstream area, it is not limited to this. For example, the flow resistance of the flow path of the first fluid A from the first inflow path Ra1 to the first outflow path Ra2 in the plate heat exchanger 2 is larger on the first outflow path Ra2 side than on the first inflow path Ra1 side. It may be made to be. In this way, the first fluid A is appropriately retained (not let through) in the flow path (first flow path R1) of the first fluid A from the first inflow path Ra1 to the first outflow path Ra2. Heat exchange efficiency with the second fluid B flowing through the second flow path R2 is increased. As a result, the first fluid (steam) A can be reliably liquefied (to be drained).

  Specifically, as shown in FIG. 8, a plurality of first inflow channels Ra1 may be provided, and a smaller number of first outflow channels Ra2 may be provided than the number of first inflow channels Ra1. That is, by making the number of the first inflow channel Ra1 and the first outflow channel Ra2 different, the first channel is more than the channel cross-sectional area of the channel for allowing the first fluid A to flow into the first channel R1. You may make it make the flow path cross-sectional area of the flow path for flowing out the 1st fluid A from R1 small. If it does in this way, distribution resistance in the 1st outflow channel Ra2 of the 1st fluid A will become large, and heat of the 1st fluid A which circulates through the 1st channel R1 and the 2nd fluid B which circulates through the 2nd channel R2 The exchange efficiency is increased, and the first fluid (steam) A can be reliably liquefied (to be drained).

  Further, as shown in FIGS. 9 and 10, a partition (not numbered) is formed between the heat transfer plates 20, and the flow path width of the first flow path R1 is increased from the first inflow path Ra1 toward the first outflow path Ra2. You may make it reduce continuously or intermittently. In this way, the channel cross-sectional area of the first channel R1 becomes smaller toward the first outflow channel Ra2 (corresponding to the reduction in the channel width). Thereby, since the flow resistance of the first fluid A increases toward the downstream side of the first flow path R1, the heat of the first fluid A flowing through the first flow path R1 and the second fluid B flowing through the second flow path R2 The exchange efficiency is increased, and the first fluid (steam) A can be reliably liquefied (to be drained).

  Furthermore, as shown in FIG. 11, the interval between the heat transfer plates 20 forming the first flow path R1 may be narrower on the first outflow path Ra2 side than on the first inflow path Ra1 side. That is, on the first surface that defines the first flow path R1 of the adjacent heat transfer plates 20, by changing the formation of the ridges in the upstream area, the middle flow area, and the downstream area, from the first inflow path Ra1 side. Alternatively, the distance between the first surfaces of the heat transfer plates 20 and 20 on the first outflow path Ra2 side may be reduced. If it does in this way, corresponding to the space | interval of the heat exchanger plates 20 and 20, the flow-path cross-sectional area of 1st flow path R1 will become small as the 1st outflow path Ra2 side. Thereby, since the flow resistance of the first fluid A increases toward the downstream side of the first flow path R1, the heat of the first fluid A flowing through the first flow path R1 and the second fluid B flowing through the second flow path R2 The exchange efficiency is increased, and the first fluid (steam) A can be reliably liquefied (to be drained).

  Further, as shown in FIG. 12, the first inflow path Ra1 is connected to a specific first flow path R1 among the plurality of first flow paths R1, and the first outflow path Ra2 is connected to the first outflow path Ra1. Connected to the first flow path R1 other than the specific first flow path R1, the specific first flow path R1 and the first flow path R1 other than the specific first flow path R1 pass through the heat transfer plate 20 A relay path Rv formed by connecting holes in the first direction and connected via a relay path Rv extending in the first direction, and the number of the specific first flow paths R1 is the specific first flow path R1. You may make it more than the number of 1st flow paths R1 other than.

  In this way, the flow passage cross-sectional area of the flow path (flow passage) of the first fluid A connecting the first inflow passage Ra1 and the first outflow passage Ra2 is narrower on the downstream side than on the upstream side. That is, the number of the first flow paths R1 connected to the first outflow path Ra2 is smaller than the number of the first flow paths R1 connected to the first inflow path Ra1, and the flow path (flow path of the first fluid A) ) The cross-sectional area of the channel becomes smaller toward the downstream side. Accordingly, since the first fluid A is appropriately retained (not allowed to pass through) in the first flow path R1, the efficiency of heat exchange with the second fluid B flowing through the second flow path R2 is increased. As a result, the first fluid A (steam) can be reliably liquefied (to be drained).

  In each of the above embodiments, the plate heat exchanger 2 in which the space between the outer peripheral ends of the adjacent heat transfer plates 20 and the periphery of the through holes 200 of the adjacent heat transfer plates 20 is sealed by brazing is employed. However, the present invention is not limited to this. For example, a plate-type heat in which a gasket is disposed between the outer peripheral end portions of adjacent heat transfer plates 20 or around the through hole 200 of the adjacent heat transfer plate 20 and the heat transfer plates 20 are sealed by the gasket. The exchanger 2 may be used.

  In each said embodiment, although the regulating valve 30 and the 1st temperature sensing means 7 comprised the automatic temperature regulating valve, it is not limited to this. For example, the temperature of the first fluid A flowing through the first discharge piping system 4 is sensed, and the valve opening of the regulating valve 30 is manually adjusted so that the sensed result is lower than the liquefaction temperature of the steam. Also good. That is, the first temperature sensing means 7 for sensing the temperature of the first fluid A senses the temperature of the first fluid A flowing through the first discharge piping system 4 over time, and the first temperature sensing means 7 And a step of adjusting the valve opening of the regulating valve 30 so that the sensing result is equal to or lower than the liquefaction temperature of the steam.

  DESCRIPTION OF SYMBOLS 1 ... Heat exchange system, 2 ... Plate type heat exchanger, 3 ... 1st supply piping system, 4 ... 1st discharge piping system, 5 ... 2nd supply piping system, 6 ... 2nd discharge piping system, 7 ... 1st Temperature sensing means, 8 ... second temperature sensing means, 9 ... control unit, 20 ... heat transfer plate, 30 ... first regulating valve (regulating valve), 31 ... open / close valve, 32 ... second regulating valve (regulating valve), DESCRIPTION OF SYMBOLS 70 ... Sensing part, 71 ... Sensing result transmission means, 80 ... Sensing part, 81 ... Sensing result transmission means, 90, 91 ... Communication line, 200 ... Through-hole, 300 ... Valve body, 301 ... Actuator, 320 ... Valve body, 321 ... Actuator, A ... First fluid, B ... Second fluid, M ... Electric motor, P ... Pump, R1 ... First flow channel, R2 ... Second flow channel, Ra1 ... First inflow channel, Ra2 ... First outflow channel , Rb1 ... second inflow path, Rb2 ... second outflow path, Rv ... relay path, T ... storage tank

Claims (5)

  A plate-type heat exchanger including a plurality of heat transfer plates stacked in a first direction, wherein the first fluid is passed through the heat transfer plates as a boundary by sealing between adjacent heat transfer plates. The first flow path that circulates in the second direction orthogonal to the direction and the second flow path that circulates the second fluid in the second direction are alternately formed in the first direction, and each of the plurality of heat transfer plates The first through-flow path and the first out-flow path each extending in the first direction and communicating with only the first flow path, and each extending in the first direction and only in the second flow path A plate-type heat exchanger having a second inflow passage and a second outflow passage communicating with each other, and a first supply piping system connected to the first inflow passage, the first inflow passage as a first fluid A first supply piping system for supplying steam and a first supply pipe connected to the first outflow passage A discharge piping system, comprising: a first discharge piping system for discharging the first fluid from the first outflow passage; and first temperature sensing means for sensing the temperature of the first fluid flowing through the first discharge piping system, One supply piping system includes an adjustment valve capable of adjusting the valve opening degree, and the adjustment valve adjusts the valve opening degree so that the detection result of the first temperature sensing means is lower than the liquefaction temperature of the steam. And heat exchange system.   A second supply piping system connected to the second inflow channel, the second supply piping system supplying the second fluid to the second inflow channel, and the second discharge piping system connected to the second outflow channel. And a second discharge piping system for discharging the second fluid from the second outflow passage, and a second temperature sensing means for sensing the temperature of the second fluid flowing through the second discharge piping system. The system includes two regulating valves, and one of the two regulating valves adjusts the valve opening so that the sensing result of the first temperature sensing means is lower than the liquefaction temperature of the steam, The other regulating valve of the regulating valves adjusts the valve opening degree so that the sensing result of the second temperature sensing means becomes a preset temperature of the second fluid after heat exchange set in advance. Heat exchange system.   A second supply piping system connected to the control unit and the second inflow passage, the second supply piping system supplying the second fluid to the second inflow passage, and a second discharge connected to the second outflow passage. A second exhaust pipe system for discharging the second fluid from the second outflow passage, and a second temperature sensing means for sensing the temperature of the second fluid flowing through the second exhaust pipe system, The control unit adjusts the detection result of the first temperature sensing means to be equal to or lower than the liquefaction temperature of the steam and the detection result of the second temperature sensing means is a preset temperature of the second fluid after the heat exchange set in advance. The heat exchange system according to claim 1, wherein the valve opening is adjusted with respect to the valve.   The flow resistance of the flow path of the 1st fluid which goes to the 1st outflow path from the 1st inflow path in a plate type heat exchanger is larger in the 1st outflow path side than in the 1st outflow path side. The heat exchange system according to item.   A plate-type heat exchanger including a plurality of heat transfer plates stacked in a first direction, wherein the first fluid is passed through the heat transfer plates as a boundary by sealing between adjacent heat transfer plates. The first flow path that circulates in the second direction orthogonal to the direction and the second flow path that circulates the second fluid in the second direction are alternately formed in the first direction, and each of the plurality of heat transfer plates The first through-flow passage and the first out-flow passage that each extend in the first direction and communicate with the first flow path, and each extend in the first direction and communicate with the second flow path by connecting the through holes provided in the first passage. A plate-type heat exchanger in which a second inflow path and a second outflow path are formed, and a first supply piping system including a regulating valve and connected to the first inflow path, Connected to the first supply piping system that supplies steam as fluid and the first outflow passage 1st temperature sensing means for sensing the temperature of the first fluid in the operation method of the heat exchanging system including the first exhaust piping system for discharging the first fluid from the first outflow passage The process of sensing the temperature of the first fluid flowing through the first discharge piping system over time, and adjusting the valve opening of the regulating valve so that the sensing result of the first temperature sensing means is below the liquefaction temperature of the steam And a method for operating the heat exchange system.

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