KR100895885B1 - Cold water two stage absorption chiller with improved heat exchanger layout - Google Patents

Abstract

The present invention relates to a cold water two-stage absorption chiller suitable for a mall or apartment in a district heating area, and more specifically, an auxiliary regenerator is disposed at an upper part and an auxiliary absorber is located at a lower part for a secondary cycle that was conventionally installed therebetween. The cold water two-stage absorption chiller having an improved heat exchange arrangement structure configured to reduce the production cost and the operating power cost by removing the concentrate pump. According to the present invention as described above, an auxiliary regenerator is positioned at the top of the apparatus and an auxiliary absorber is disposed at the bottom of the apparatus. It is possible to reduce the manufacturing cost and operating power cost by configuring the auxiliary concentrate to be supplied to the auxiliary absorber through the auxiliary heat exchanger from the auxiliary regenerator only by gravity without installing the auxiliary concentrate pump by arranging the auxiliary concentrate pump.

Absorption Chiller, District Heating, Auxiliary Concentration Pump, Auxiliary Heat Exchanger, Gravity, Cost Reduction

Description

Low Temperature Hot Water Driven Single Effect Double Lift Absorption Refrigerator with Improved Heat Exchanger Arrangement}

The present invention relates to a cold water two-stage absorption chiller, and more particularly, the auxiliary regenerator is located at the top and the auxiliary absorber is located at the bottom to remove the auxiliary cycle agricultural pump that was previously installed between the manufacturing cost and operation It is a cold water two stage absorption chiller having an improved heat exchange structure configured to reduce power costs.

Absorption freezer is a freezer driven by thermal energy such as combustion heat, steam heat, hot water heat, unlike an electrically driven compression freezer.

As a type of absorption chiller, a low temperature water two-stage absorption chiller has been developed that uses the hot water supplied for district heating in summer to perform cooling in summer by using an existing hot water pipe network. The refrigerator has two cycles, a main cycle and a secondary cycle, so when the cooling load drops below 80%, one cycle can be stopped to improve the energy use efficiency (COP) by 25%. It is 15% more efficient than the low temperature absorption chiller in use, which greatly reduces the operating cost. Therefore, this cold water two-stage absorption chiller is widely used in district heating districts and is a cooling method suitable for malls and apartments in district heating districts.

The low temperature two stage absorption chiller is an eco-friendly, non-polluting product that uses water as a refrigerant, and it is a product that can prevent electric power concentration in the summer season by using hot water mainly used only in winter as a driving source. In addition, it is very safe because it is operated in a vacuum state, and the product combined with the heat exchanger enables automatic operation to perform unmanned operation.

1 is a system diagram showing the configuration of a conventional low temperature water two stage absorption refrigerator.

Referring to Figure 1, in the conventional low-temperature water two-stage absorption chiller 10, the circulation system of the absorption liquid consists of two parts, the main system and the auxiliary system.

Referring to the main system, the absorbent liquid dispersed at the upper end of the absorber 16 and absorbing the refrigerant vapor is discharged from the absorber 16 and pressurized by the solution pump 23 to be a low temperature heat exchanger 19 and a high temperature heat exchanger. Passed through the 18 to the first regenerator 11 and dispersed in the upper portion of the first regenerator 11, some of the refrigerant vapor is cooled and condensed by the cooling water through the eliminator 26, the intermediate The absorbed liquid which has been increased to a degree is transferred to the second regenerator 14 via the high temperature heat exchanger 18 and dispersed at the top of the second regenerator 14. The refrigerant vapor is discharged from the second regenerator 14 and the concentrated absorbent liquid is returned to the absorber 16 via the low temperature heat exchanger 19 and is dispersed at the upper end of the absorber 16.

Next, the auxiliary system will be described. The auxiliary absorbing liquid which absorbs the refrigerant vapor supplied from the second regenerator 14 via the eliminator 24 and is diluted is discharged from the auxiliary absorber 15 by the solution pump 21. It is pressurized and flows to the auxiliary regenerator 12 via the auxiliary heat exchanger. Scattered from the upper end of the auxiliary regenerator 12, the refrigerant vapor is discharged, and the concentrated absorbent liquid is returned to the auxiliary absorber 15 through the auxiliary heat exchanger.

On the other hand, in the condenser 13, the refrigerant vapor generated in the first regenerator 11 and the auxiliary regenerator 12 is condensed, and the refrigerant liquid is delivered to the evaporator 17. In the evaporator 17, the refrigerant is scattered to the upper portion of the evaporator 17 by the refrigerant pump 23, and some vaporized refrigerant vapor is transferred to the absorber 16 through the eliminator 25. The refrigerant liquid which has not been evaporated is accumulated under the evaporator 17 and dispersed again by the refrigerant pump 23 to the top of the evaporator 17.

In addition, the cold water is cooled while flowing inside the tube of the evaporator 17 is used for cooling, the cooling water absorbs heat while passing through the absorber 16, the auxiliary absorber 15 and the condenser 13 to the cooling tower (not shown) Go on and continue the cycle of releasing heat into the atmosphere, cooling it back to absorber 16. The hot water passes through the first regenerator 11, the second regenerator 14, and the auxiliary regenerator 12 to heat the absorption liquid to separate the refrigerant vapor.

However, the conventional low temperature two-stage absorption chiller has a subsidiary absorber located above or at the same level as the subabsorber, and thus it does not use gravity when discharging the absorbed liquid from the subsidiary regenerator to the subsidiary absorber. As a result, the manufacturing cost increases, the pipe configuration becomes complicated, and the size of the facility increases.

In addition, the conventional low temperature two-stage absorption chiller is provided with a second regenerator, an auxiliary regenerator, and a first regenerator are distributed, so that the length of the pipe connecting the three regenerators is increased, resulting in an increase in the pressure loss of the hot water line. As a result, disadvantages in manufacturing cost have to increase the number of heat pipes than actually needed.

The present invention has been made in order to solve the problems of the prior art as described above, the first regenerator and the auxiliary regenerator is located in the upper portion and the auxiliary absorber is installed in the lower portion of the absorption liquid supplied from the auxiliary regenerator to the auxiliary absorber through the auxiliary solution heat exchanger Absorption of low-temperature water by two-stages configured to reduce the manufacturing cost and operating power cost by eliminating the pressure loss generated in the auxiliary solution heat exchanger by configuring the absorption liquid without using the auxiliary concentrate pump due to the gravity caused by the height difference. It is an object of the invention to provide a refrigerator.

In addition, the present invention, the first regenerator, the second regenerator, and the auxiliary regenerator are all disposed adjacent to each other to shorten the length of the hot water connection pipe, and simplified to reduce the pressure loss of the hot water, through which the quantity of heat pipes used excessively unnecessary It is another object of the present invention to provide a cold water two-stage absorption chiller that reduces the manufacturing cost by reducing the cost.

In order to achieve the above object of the present invention, in the present invention, an evaporator, an absorber, an auxiliary absorber, a condenser, a first regenerator, a second regenerator, an auxiliary regenerator, a high temperature heat exchanger, a low temperature heat exchanger, and a plurality of pumps are connected thereto. In the low temperature water two-stage absorption chiller consisting of a refrigerant line, an absorbing liquid line, a cold water line, a cooling water line, and a hot water line, the evaporator 111 installed on the left side and the evaporator 111 installed on the right side are installed on the right side of the eliminator 113. A first shell 110 composed of an absorber 112; The first regenerator 121 located below, the auxiliary regenerator 122 positioned on the upper right side of the first regenerator, the condenser 123 located on the upper left side of the first regenerator, the condenser and the auxiliary regenerator A second shell 120 having an eliminator 124 disposed therebetween and positioned above the first shell; Cold water 2 characterized in that it comprises the auxiliary absorber 132 located below, the second regenerator 131 located on the auxiliary absorber, and a third shell 130 located on the right side of the first shell. Provided only absorption chiller.

According to the present invention as described above, the auxiliary regenerator is located in the upper part of the device and the auxiliary absorber is arranged in the lower part so that the auxiliary concentrate is supplied to the auxiliary absorber via the auxiliary solution heat exchanger from the auxiliary regenerator only by gravity without installing the auxiliary concentrate pump. It can reduce the manufacturing cost and reduce the driving power cost.

In addition, according to the present invention, the first regenerator, the second regenerator, and the auxiliary regenerator are disposed adjacent to shorten and simplify the length of the hot water connection pipe, thereby reducing the pressure loss of the hot water and reducing the quantity of heat pipes that are used excessively. Can reduce the cost.

Hereinafter, the configuration of the cold water two-stage absorption chiller according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition is made based on the contents throughout the specification.

Figure 2 is a schematic diagram showing the configuration of the cold water two-stage absorption chiller according to the present invention. The cold water two-stage absorption chiller is an environmentally friendly freezer, which is a cooling method suitable for a mall or apartment in a district heating area. Referring to FIG. 2, the cold water two-stage absorption chiller 100 according to the present invention includes a first shell. (shell) 110, a second shell 120, and a third shell 130.

First, the first shell 110 is disposed on the left side from the bottom of the device, the evaporator 111 is installed on the left side as shown in the figure, the absorber 112 is installed on the right side, the evaporator 111 and the absorber 112. In between the eliminator 113 is installed, the third shell 110 is installed on the side. Here, the first shell 110 is provided with a first pedestal 114 having a downward inclined surface so that the refrigerant dripping from the evaporator 111 is collected on one side to facilitate discharge, and the absorbent liquid dripping from the absorber 112 is The lower end is formed in a hemispherical shape to facilitate the discharge to the center.

The second shell 120 includes a first regenerator 121, an auxiliary regenerator 122 at an upper right side thereof, and a condenser 123 at an upper left side sequentially installed from the bottom, and a condenser 123 and an auxiliary regenerator. An eliminator 124 is also installed between the 122. In addition, the second shell 120 is provided with a second pedestal 125 having a downward inclined surface so that the refrigerant liquid dropped from the condenser 123 gathers to one side and is easily discharged, and the absorption liquid dropped from the auxiliary regenerator 122. The bottom is made flat, but may be configured to have a predetermined inclination so that it is easily discharged, and the bottom of the first regenerator 121 is also formed flat but has a predetermined inclination so that the absorbent liquid is easily dropped. Can be formed to be discharged.

In addition, the third shell 130 is disposed on the right side of the first shell 110 so that the second regenerator 131 is installed at the upper side as shown in the drawing, and the auxiliary absorber 132 is installed at the lower side, and the second regenerator ( The bottom surface 133a of the 131 may be formed to be flat or have a predetermined inclination so that the absorbent liquid is easily discharged, and the bottom of the auxiliary absorber 132 may have a bottom surface to facilitate the discharge of the absorbent liquid to be dropped into the center. 133b is formed in a hemispherical shape.

Meanwhile, the low temperature heat exchanger 140 and the high temperature heat exchanger 150 are installed at a lower end of the low temperature water two stage absorption chiller 100, and the auxiliary heat exchanger 160 is disposed at a third downstream from the bottom of the auxiliary regenerator 122. It is installed in the pipe between the second regenerator 131 and the sub-absorber 132 of the shell 130 is connected so as to be distributed above the sub-absorber 132 by the gravity due to the difference in the height of the sub-concentrate without the sub-pump.

Before describing the operation of the present invention, the main features of the present invention will be described.

The cold water two-stage absorption chiller 100 is composed of ten heat exchangers and five fluid circulation systems, that is, lines, and is a complex product in which fluids exchange heat in each heat exchanger. Therefore, the arrangement of the heat exchanger suitable for the circulation characteristics of the fluid has a significant influence on the performance, the size of the product, and the manufacturing cost, so the following important features should be considered.

In the present invention, since the bulky refrigerant vapor evaporated in the evaporator 111 should move to the absorber 112, the evaporator 111 and the absorber 112 are positioned adjacent to each other, and the second regenerator 131 is also evaporated. Since the bulky refrigerant vapor has to be moved to the auxiliary absorber 132, the second regenerator 131 and the auxiliary absorber 132 are positioned adjacent to each other up and down.

In addition, in the present invention, since the first regenerator 121, the auxiliary regenerator 122, and the condenser 123 are operated at the same pressure, the first regenerator 121, the auxiliary regenerator 122, and the condenser 123 are operated in the same second shell 120. The pressure zone was divided into three parts and consisted of three shells.

In the present invention, the first regenerator 121, the auxiliary regenerator 122, and the second regenerator 131 are disposed close to each other to simplify the hot water line.

On the other hand, in the present invention, the arrangement of the evaporator 111, the absorber 112, the auxiliary regenerator 122, the condenser 123, the first regenerator 121 and the auxiliary regenerator 122 in the air of the water system Water hammering and water freezing accidents are prevented by natural draining and water draining.

Hereinafter, the operation of the cold water two-stage absorption chiller according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to the operation of the main system of the present invention, the absorbent liquid dispersed at the upper end of the absorber 112 and absorbing the refrigerant vapor is discharged from the absorber 112 and pressurized by the solution pump 101 to be cooled at low temperature. The refrigerant 140 is delivered to the first regenerator 121 through the gas 140 and the high temperature heat exchanger 150 and is dispersed in the upper part of the first regenerator 121 to discharge some refrigerant vapor. Passed through the high temperature heat exchanger 150 to the second regenerator 131 via the 101, and is distributed in the upper portion of the second regenerator 131.

The refrigerant vapor is discharged from the second regenerator 131, and the concentrated absorbent liquid is distributed back to the absorber 112 through the low temperature heat exchanger 140 by the concentrate pump 101 and dispersed at the upper end of the absorber 112. At this time, the absorbent liquid dropped by the U-shaped shape of the bottom surface of the first shell 110 and the bottom surface 133a of the third shell 130 may be easily collected and discharged. This bottom surface may be configured to be somewhat downwardly inclined.

On the other hand, when the auxiliary system is described, the auxiliary absorbent liquid absorbed by the refrigerant vapor passed from the second regenerator 131 is discharged from the auxiliary absorber 132 and is pressurized by the auxiliary diluent pump 101 to supply the auxiliary heat exchanger 160. After that, it goes to the auxiliary player 122. The auxiliary absorber 132 is dispersed at the top of the auxiliary regenerator 122 and discharges the refrigerant vapor, and the concentrated absorbent liquid is supplied to the auxiliary absorber 132 via the auxiliary heat exchanger 160 by the gravity of the auxiliary concentrate generated due to the height difference even without the auxiliary concentrate pump. Return to. At this time, the absorbent liquid dropped by the U shape of the bottom surface 133b formed at the lower end of the auxiliary absorber 132 and the bottom surface of the auxiliary regenerator 122 may be easily discharged. A constant slope may be formed on this bottom surface. As a result, since the auxiliary concentrate pump used in the prior art can be removed, the manufacturing cost can be reduced and the driving power cost can be reduced.

On the other hand, in the condenser 123, the refrigerant vapor generated in the first regenerator 121 and the auxiliary regenerator 122 is condensed, and the refrigerant liquid is delivered to the evaporator 111. In the evaporator 111, the refrigerant is dispersed by the refrigerant pump 101 to the upper portion of the evaporator 111, and the partially evaporated refrigerant vapor is transferred to the absorber 112 through the eliminator 113. The refrigerant liquid which has not been evaporated is accumulated under the evaporator 111 and dispersed again by the refrigerant pump 101 to the top of the evaporator 111. At this time, the coolant liquid dropped by the first support 114 formed at the lower end of the evaporator is easily collected and discharged to one side.

In addition, the cold water (about 13 ℃) is cooled to about 8 ℃ while flowing inside the tube of the evaporator 111 is used for cooling, the cooling water (about 31 ℃) is the absorber 112, the auxiliary absorber 132, and the condenser ( 123) absorbs heat and is warmed to about 36.5 ℃ to go to the cooling tower (not shown) to release the heat to the atmosphere, and continue cooling the cooling back to the absorber (112). At this time, since the coolant line 170 is transferred from the absorber 112 directly to the auxiliary absorber 132, the path of the pipe is simplified.

On the other hand, hot water (approximately 95 ° C.) from a hot water source, such as a district heating hot water source, heats the absorbent liquid through the first regenerator 121, the auxiliary regenerator 112, and the second regenerator 131 to cool refrigerant vapor. The temperature is lowered to about 55 ° C. while separating.

In the foregoing detailed description of the invention, only specific embodiments of the invention have been described. The present invention removes the auxiliary concentrate pump used in the conventional equipment by installing the auxiliary regenerator above the auxiliary absorber so that the auxiliary absorption liquid is supplied from the auxiliary regenerator to the auxiliary absorber by gravity, and thus different from the above-described embodiment. Of course, it is possible to achieve the same purpose by installing each heat exchanger.

Accordingly, the invention should not be construed as limited to the specific embodiments set forth in the description, but includes all modifications, equivalents, and substitutes falling within the spirit and scope of the invention as defined by the appended claims below. It should be understood as

1 is a system diagram showing the configuration of a conventional low temperature two-stage absorption chiller,

Figure 2 is a schematic diagram showing the configuration of the cold water two-stage absorption chiller according to the present invention.

<Explanation of symbols on main parts of the drawings>

101: pump 110: first shell

111: evaporator 112: absorber

113, 124: eliminator 114: first pedestal

120: second shell 121: first player

122: auxiliary regenerator 123: condenser

125: second pedestal 130: third shell

131: second regenerator 132: auxiliary absorber

133: bottom 140: low temperature heat exchanger

150: high temperature heat exchanger 160: auxiliary heat exchanger

170: coolant line

Claims (4)

delete Evaporator, absorber, sub-absorber, condenser, first regenerator, second regenerator, auxiliary regenerator, high temperature heat exchanger, low temperature heat exchanger, and a plurality of pumps connecting them with refrigerant line, absorbent line, cold water line, cooling water line, hot water line In the cold water two-stage absorption chiller consisting of: a first shell (110) consisting of the evaporator (111) installed on the left side and the absorber (112) installed on the right side of the eliminator (113) installed in the middle; The first regenerator 121 located below, the auxiliary regenerator 122 positioned on the upper right side of the first regenerator, the condenser 123 located on the upper left side of the first regenerator, the condenser and the auxiliary regenerator A second shell 120 having an eliminator 124 disposed therebetween and positioned above the first shell; An auxiliary absorber (132) positioned below and the second regenerator (131) positioned on the auxiliary absorber, and including a third shell (130) positioned on the right side of the first shell; In the auxiliary regenerator 122 located in the second shell 120 above the first shell 110, the auxiliary concentrate is located on the side of the first shell 110 through the auxiliary heat exchanger 160 without the auxiliary concentrate pump. Cold water two-stage absorption chiller, characterized in that configured to be supplied by gravity to the auxiliary absorber 132 installed in the lower portion of the third shell (130). The bottom surface of the evaporator 111 is provided with a first pedestal inclined downward, and the bottom surface of the condenser 123 is provided with a second pedestal inclined downward. Low temperature water two stage absorption chiller. The method of claim 2 or 3, The absorption chiller is a cold water two-stage absorption chiller, characterized in that it is used for cooling the hot water in the district and apartments using district heating.

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