JPS62119330A - Double-pipe steam conveying equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial field of application The present invention guides heat medium vapor generated in a steam generator through a steam pipe to a heat radiation tube in a heat radiation section, and gives latent heat to the surrounding fluid with this heat radiation tube. , a double pipe in which the condensed liquid is temporarily stored in a condensate reservoir through a condensate pipe, and then refluxed to the steam generator through a reflux pipe by the decompression effect generated by stopping heating, and by repeating this process, thermal energy is transported. The present invention relates to a type steam conveying device.

・Prior art and its problems Figure 1 shows a conventional double-pipe steam conveying device, where numeral 1 is a steam generator, inside which a heat transfer liquid 2 is sealed, and 6 and 7 are steam generators. A high liquid level sensor and a low liquid level sensor are installed in the steam generator 1 to detect the amount of heat transfer liquid 2, respectively.

3 is the burner and 4 is the fuel supply/l? This is a fuel valve installed in the middle of 5. Reference numeral 20 denotes a heat dissipation section, in which a heat dissipation tube 9 is incorporated. 12 is a condensate reservoir, and a communication port 13 with the atmosphere is provided in the upper part of the condensate reservoir.

8 is a steam pipe that connects the top of the steam generator l and the inlet of the heat radiation tube 9; 10 is a condensate pipe that connects the outlet of the heat radiation tube 9 and the condensate reservoir; It opens at the bottom of the reservoir 12.

15 is a reflux pipe connecting the bottom of the alili liquid reservoir 12 and the bottom of the steam generator 1, and a check valve 14 is installed in the middle of this reflux pipe 15. 17 is an inner shell provided so that combustion gas flows around the steam generator 1; 18 is a flue; 1
9 is a combustion fan attached to the flue. 16 is a control device.

In this conventional example, when the operation switch is turned on, the combustion fan 19 feeds air into the burner 3, the fuel valve 4 opens, and combustion starts, heating the heat transfer liquid 2 in the steam generator 1.

When the pressure inside the steam generator 1 becomes equal to or higher than atmospheric pressure, the heat medium vapor is sent through the steam pipe 8 to the heat radiation tube 9 in the heat radiation section 20, and the heat medium vapor imparts latent heat to the surrounding fluid of the heat radiation tube 9. The condensed liquid is discharged into the condensate reservoir 12 through the condensate pipe io, and the pressure applied to the condensate 2a in the condensate reservoir 12 stored here is always kept at atmospheric pressure by the atmospheric communication port 13. is maintained. Due to the action of the check valve 14, the heat transfer liquid 2 cannot flow from the steam generator l in the direction of the condensate reservoir 12.

When the amount of heat transfer liquid 2 in the steam generator 1 becomes below the position of the low liquid level sensor 7, the fuel valve 4 closes to stop heating the steam generator 1. Since the heat medium between the steam generator l and the heat radiation tube 9 can be considered to be in a saturated state, the saturated vapor pressure corresponds to the heat medium temperature, and from the high temperature steam generator l,
The heat medium vapor still flows out toward the heat radiation tube 9, and as a result, the heat medium liquid 2 in the steam generator 1 is deprived of latent heat of vaporization and rapidly lowers in temperature, thereby reducing the pressure.

When water is used as a heat medium, when the temperature of the heat medium in the steam generator 1 falls below 100°C, the pressure falls below atmospheric pressure, so the check valve 14 installed in the middle of the reflux pipe 15 opens. The condensate (heat medium liquid) 2a stored in the condensate reservoir 12 begins to flow into the steam generator 1 through the reflux pipe 15.

Once the reflux of the condensate starts, the temperature of the condensate is as low as 60 to 80°C, so the heat transfer liquid 2 inside the steam generator 1
The pressure is rapidly reduced to a saturated vapor pressure corresponding to the temperature of , promoting reflux, and the reflux of the condensate 2a to the steam generator 1 is completed in 10 to 20 seconds after combustion is stopped.

When the amount of heat transfer liquid 2 in the steam generator 1 has recovered to the level measured by the high liquid level sensor 6, the fuel valve 4 is opened, combustion is restarted, and the steam is sent out.This process is repeated to radiate heat from the steam. It was intended to be transported to the department.

However, in the above-mentioned conventional example, when the amount of the heat transfer liquid 2 in the steam generator 1 decreases to the position of the low liquid level sensor 7 and the combustion stops, the condensate is accumulated in the condensate reservoir 12. 2
There was a problem in that a part of the air flowed back toward the heat radiation tube 9 and cooled the heat radiation tube 9. Furthermore, when the capacity of the heat dissipation tube 9 is small, most of the heat dissipation tube 9 is occupied by the condensate that has flowed back, so the performance as a condenser is significantly impaired, and the heat transfer liquid inside the steam generator 1 is evaporation is inhibited. In this case, the heat transfer liquid 2 in the steam generator 1 is not deprived of latent heat of vaporization, but
Since the steam generator 1 is cooled while maintaining temperature equilibrium with the surrounding inner shell 17, not only does it take a long time to reduce the pressure to below atmospheric pressure, but it also takes a long time to reduce the pressure to the saturation temperature corresponding to the pressure. The problem was that energy had to be released.

・Purpose of the present invention The present invention connects a steam generator and a heat radiating section with a steam pipe, and connects the heat radiating section and a condensate reservoir with a condensate pipe. When the condensate is pumped to the heat radiation section and the condensate is refluxed into the steam generator by the depressurization effect that occurs when heating is stopped, the low temperature condensate flows through the heat radiation tube 9.
The aim is to propose a double-pipe steam conveying device that prevents backflow to the side and ensures that the condensate is returned to the steam generator in a very short time.

・Structure of the present invention In order to achieve the above-mentioned object, the present invention provides: In a double-pipe steam conveying device, a steam generator having a heating source, a heat radiating section incorporating a heat radiating tube inside,
a steam pipe that guides the steam generated in the steam generator to the heat radiation section; and an atmospheric pressure type condenser for storing the condensed heat transfer liquid by imparting latent heat to the surrounding fluid while the steam passes through the heat radiation tube. a liquid reservoir, a condensate pipe whose end opens at the bottom of the condensate reservoir for guiding the condensate from the heat radiation part to the condensate reservoir, and a check valve provided in the middle of the condensate pipe. The present invention employs a structure comprising: a reflux pipe connecting the condensate reservoir and the steam generator; and a check valve provided in the middle of the reflux pipe.

In the above device, when the operation switch is turned on, the fuel valve opens and the heat medium liquid in the steam generator is heated, and the heat medium vapor is sent to the heat radiation part through the steam pipe, and as it passes through the heat radiation tube, it gives latent heat to the surrounding fluid. It condenses, passes through a condensate pipe io, and is temporarily stored in a condensate reservoir having an air communication port at the top. When the amount of heat transfer liquid in the steam generator decreases to the low level sensor position, combustion is stopped, but the pressure in the heat dissipation tube can be regarded as the saturation pressure corresponding to the liquid temperature at the gas-liquid interface.
Immediately after combustion stops, a check valve installed in the middle of the condensate pipe closes, shutting off the steam generator, steam pipe, and heat radiation tube from the atmosphere. The heat transfer liquid sealed in the steam generator which is in a high temperature state evaporates and flows out through the steam pipe 8 toward the heat dissipation tube 9 which is in a low temperature state and functions as a condenser. The temperature of the heating medium drops rapidly, and the pressure also rises rapidly (because it can be considered to be under saturated conditions), and when the pressure drops below atmospheric pressure, the check valve installed in the middle of the reflux pipe opens and condensation accumulates in the condensate reservoir. Once the liquid (heat transfer liquid) begins to flow into the steam generator, because the temperature of the inflow liquid is relatively low, the pressure is further reduced and reflux progresses at an accelerated pace. When the heat transfer liquid returns to the high level sensor position, heating is resumed and steam is conveyed again.

As described above, the present invention has the effect of minimizing the reflux time and thermal energy loss during reflux, and preventing the backflow of low-temperature condensate to the heat dissipation section in a multi-pipe intermittent steam conveying device that does not use a pump. It is something that brings.

·Example FIG. 2 shows an embodiment of the invention described above.

Reference numeral 11 is a check valve installed in the middle of the condensate pipe 10, and the other reference numerals are the same as in FIG.

Next, an example of operation of the above embodiment will be explained.

When operating the device for the first time after installation, steam generator 1,
Prepare a heat medium liquid in an amount equal to the total volume of the steam pipe 8, heat dissipation tube 9, and condensate pipe 10 plus the volume that takes into account the evaporation loss from the opening 13 of the condensate reservoir 12 to the atmosphere. The amount of liquid is injected into the steam generator 1 to be equal to that of the high liquid level sensor 6, and the remaining amount is poured into the condensate reservoir 12.

When the operation switch is turned on, the fuel valve 4 opens and the fuel tank 3
Combustion is started in the steam generator 1, and the heat transfer liquid 2 in the steam generator 1 is heated.

When the heat transfer liquid 2 reaches the saturation temperature at atmospheric pressure, steam is generated, and the steam is generated in the upper space of the steam generator 1, the steam pipe 8, the heat radiation tube 9. The air in the condensate pipe 10 is also exhausted to the atmosphere through the opening 13 with steam and condensate.

When the amount of the heat medium liquid 2 in the steam generator 1 decreases below the low level sensor 7, the fuel valve 4 closes and the pressure inside the steam generator 1 is reduced, and the heat medium liquid accumulated in the condensed liquid reservoir 12 is removed. 2a is the reflux pipe 15
The steam pipe 8, the heat dissipation tube 9, and the condensate pipe 10 are filled with the heat transfer liquid 2, and the condensate reservoir 1 is filled with the heat transfer liquid 2.
2, the end opening 10a of the condensate pipe remains inserted into the heat transfer liquid 2a.

During normal operation, when the operation switch is turned on, the combustion fan 19 starts to feed air into the burner 3, and then the fuel valve 4 opens to heat the heat transfer liquid 2 in the steam generator 1. When the temperature of the heat transfer liquid 2 reaches the boiling point under atmospheric pressure, steam begins to be generated, and the heat transfer liquid in the steam pipe 8 and the heat radiation tube 9 is discharged into the condensate reservoir 12 and reaches the heat radiation tube 9. The steam imparts latent heat to the surrounding fluid while passing through the heat radiation tube 9 and is condensed, and at the downstream stage of the heat radiation tube 9, a significant portion of the condensed liquid is transferred to the surrounding fluid and its temperature is lowered.

The outlet of the heat radiation tube 9 is connected to a condensate pipe 10 having a check valve 11 interposed therebetween, and discharges the condensate 2a into a condensate reservoir 12 located adjacent to the steam generator 1.

The pressure applied to the surface of the condensate (heat transfer liquid) 2a in the condensate reservoir 12 is always maintained at atmospheric pressure by the opening 13. The heat transfer liquid 2 in the steam generator 1 does not flow toward the condensate reservoir 12 during steam conveyance due to the check valve 14 installed in the middle of the reflux pipe 15 .

When the heat medium liquid 2 in the steam generator 1 decreases to the position of the low liquid level sensor 7, the fuel valve 4 closes and heating of the heat medium liquid 2 is interrupted.

Since the heat medium in the heat radiation tube 9 can be considered to be in a saturated state near the gas-liquid interface, the pressure rapidly decreases, and the check valve 11 provided in the middle of the condensate pipe 10 closes, causing the steam generator 1, the steam pipe 8, The heat dissipation tube 9 is isolated from the atmosphere. Since the heat medium in the steam generator 1 can also be considered to be in a saturated state, the high temperature heat medium liquid 2 continues to evaporate, and the steam flows out toward the low temperature heat dissipation tube 9 which acts as a condenser. At this time, the heat transfer liquid 2 is deprived of the latent heat of vaporization and its temperature drops rapidly, and when it reaches atmospheric pressure, the check valve 14 opens and the condensate 2a stored in the condensate reservoir 12 is refluxed. Steam generator 1 through pipe 15
flows into. Once the condensate 2a starts flowing into the steam generator 1, since the temperature of the condensate 2a is relatively low, the pressure in the steam generator 1 rapidly decreases, and reflux progresses at an accelerated rate. When the amount of the heat transfer liquid 2 recovers to the high liquid level sensor position i6, the fuel valve 4 opens and the heating of the steam generation Δ1 is resumed.
The steam is sent out to the heat radiation section 20 again. Note that the check valve 11.
Reference numeral 14 indicates the water head generated by the positional relationship in the height direction of the steam generator l and the condensate reservoir 12, which may be a solenoid valve or a thermal valve controlled by a liquid level sensor 6.7 and a timer. The effect of pressure is usually negligible compared to the vacuum of the steam generator, so it doesn't matter which one is above.

- Effects of the present invention The structure and operation of the present invention are as described above, and the following effects can be obtained compared to the conventional example.

a. When combustion is stopped, condensate can be prevented from flowing back from the condensate reservoir to the heat radiation tube and cooling the heat radiation tube.

b. When combustion is stopped, the communication between the steam generator and the heat radiation tube and the atmosphere is cut off until the pressure inside the steam generator is reduced to below atmospheric pressure, resulting in steam leaking from the steam generator and the heat radiation tube. The condensation in the heat dissipation tube can be reliably carried out regardless of the capacity of the heat dissipation tube, and the reflux time can be reliably reduced significantly.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional double-pipe type pneumatic conveying device, and FIG. 2 is an explanatory diagram of a steam conveying device according to the present invention. ■... Steam generator, 9... Heat dissipation tube, 10... Condensate pipe, 11... Check valve, 12... Condensate reservoir, 14... Check valve, 15... Reflux pipe.

Claims (1)

[Scope of Claims] A steam generator having a heating source; a heat radiating section incorporating a heat radiating tube therein; a steam pipe guiding steam generated in the steam generator to the heat radiating section; an atmospheric pressure type condensate reservoir for storing a heat transfer liquid condensed by imparting latent heat to the surrounding fluid while passing through the tube; and an outlet of the heat dissipation tube and the condensate reservoir, the end of which is connected to the condensate reservoir. a condensate pipe opened at the bottom of the condensate pipe, a check valve installed in the middle of the condensate pipe, a reflux pipe connecting the condensate reservoir and the steam generator, and a check valve installed in the middle of the reflux pipe. A double-pipe steam conveying device consisting of a check valve.