JPH0355756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a degassing device for an absorption chiller/heater.

Conventionally, the degassing device of this kind of absorption chiller/heater cools the absorption liquid dripped into the bleed tank with cold water used for cooling, and lowers the vapor pressure in the bleed tank to lower the pressure in the absorber. It is customary to suck the non-condensable gas remaining in the absorber into the bleed tank and then remove it outside the machine, which inevitably reduces the capacity of the absorption chiller/heater.

The present invention is configured to cool the concentrated liquid dropped into the bleed tank with a diluted liquid, and to flow the diluted absorption liquid to the outlet side of the low-temperature heat exchanger, thereby maintaining a predetermined capacity of the absorption chiller/heater. The purpose of this invention is to remove noncondensable gases while avoiding a decrease in the amount of heat exchanged in the low-temperature heat exchanger, and to increase the amount of heat exchanged in the high-temperature heat exchanger.

Embodiments of the present invention will be described below based on the drawings. The absorption chiller/heater has a basic structure in which regenerators 1, 2, condenser 3, evaporator 4, absorber 5, heat exchangers 6, 7, and water heater 8 are connected through airtight piping. The refrigerant vaporized and separated in step 2 is liquefied by dissipating heat in the condenser 3, and the liquid refrigerant is led to the evaporator 4 and vaporized in the evaporator to perform the cooling function, and the gaseous refrigerant is sequentially transferred to the absorber 5. The diluted liquid that has absorbed the refrigerant while being absorbed by the cooling liquid is guided back to the regenerators 1 and 2, where the refrigerant is heated and separated to regenerate the concentrated liquid. As shown in, the high temperature regenerator 1,
Intermediate liquid pipe 9, high temperature heat exchanger 6, intermediate liquid pipe 10, low temperature regenerator 2, concentrated liquid pipe 11, low temperature heat exchanger 7, concentrated liquid pipe 12, absorber 5, dilute liquid pump 13, dilute liquid pipe 1
4. The main absorption liquid circulation path 17 and the dilute liquid pipes 14, 15, which sequentially flow through the low temperature heat exchanger 7, the dilute liquid pipe 15, the high temperature heat exchanger 6, and the dilute liquid pipe 16 and return to the high temperature regenerator 1 again.
16 constitutes a main dilute liquid pipe line 18 that communicates with the main dilute liquid pipe line 18.

19 indicated by a broken line arrow takes a side route from the concentrated liquid pipe 12 of the main absorption liquid circulation path and returns to the absorption liquid reservoir 23 of the absorber via the bleed tank 20, the gas separation tank 21, and the return pipe 22. In another sub-absorbent liquid circulation path, the concentrated liquid flowing through the circulation path is dripped into the bleed tank 20 and the gas in the absorber 5 is introduced into the bleed tank 20 through the bleed pipe 24. It selectively absorbs the gaseous refrigerant from inside and guides the non-condensable gas remaining in the bleed tank 20 into the gas separation tank 21 in the form of bubbles when flowing down to the gas separation tank 21 through the gas-liquid mixing conduit 25. This is what I did. In the gas separation tank 21, the flow of the absorption liquid is gentle, so the bubbles flowing down through the gas-liquid mixing conduit 25 float to the top and accumulate in the upper space 26, and when the non-condensable gas reaches a certain amount or more, the bleed pump 27 is activated. and eject it outside the aircraft.

Next, 28 is an auxiliary diluted liquid pipe that takes a side route from the diluted liquid pipe 14 of the main diluted liquid piped line, passes through the air bleed tank 20, and returns to the diluted liquid pipe 15 or 16 or the intermediate liquid pipe 10,
The low-temperature diluted liquid flowing through the pipe takes away the sensible heat of the high-temperature concentrated liquid dropped into the bleed tank 20 and the absorption heat generated when the concentrated liquid selectively absorbs the gaseous refrigerant, and removes the heat inside the bleed tank 20. The vapor pressure in the absorber 5 is maintained lower than the vapor pressure in the absorber 5.

For example, the temperature 46
℃ and a concentration of 63.5% exchanges heat with the dilute solution having a temperature of 37℃ and a concentration of 58.5% flowing through the sub dilute liquid pipe 28, and the temperature of the diluted liquid increases to 40℃, and the concentrated liquid is slightly diluted. 43
When the temperature drops to ℃, the pressure inside the extraction tank 20 is approximately 5.5
mmHg. In this case, since the pressure within the absorber 5 is approximately 6 mmHg, the non-condensable gas within the absorber 5 is introduced into the bleed tank 20 via the bleed pipe 24. In addition, the diluted liquid that has passed through the bleed tank 20 is transferred to the diluted liquid pipe 1.
5, a reduction in the amount of heat exchanged in the low-temperature heat exchanger 7 is avoided, and the temperature of the dilute liquid flowing into the high-temperature heat exchanger 6 is reduced, so that the heat exchange amount in the high-temperature heat exchanger 6 is reduced. The amount of exchange increases, and since the dilute liquid recovers the heat of gaseous refrigerant absorption in the bleed tank 20, the amount of heating in the high-temperature regenerator 1 decreases. Furthermore, even when the diluted liquid that has passed through the bleed tank 20 is returned to the diluted liquid pipe 16 or the intermediate liquid pipe 10, a decrease in the amount of heat exchanged in the low-temperature heat exchanger 7 is avoided. Due to the heat recovery, the heating amount of the high temperature regenerator 1 is reduced.

Note that the absorption liquid in the gas separation tank 21 flows into the liquid reservoir 23 of the absorber through the return pipe 22, and then flows into the dilute liquid pump 13.
The liquid then flows through the main and sub-dilute pipes again. In addition, the diluted liquid flowing through the auxiliary diluted liquid pipe recovers the heat of absorption of the concentrated liquid withdrawn into the bleed tank 20, raises its temperature, and returns to the low temperature heat exchanger outlet side of the main diluted liquid pipe to a high temperature. It reaches regenerator 1.

As described above, the present invention forms a sub-absorbent liquid circulation path so as to bypass the main absorption liquid circulation path of an absorption chiller/heater and remove the absorption liquid dropwise into the bleed tank, while also A sub dilute liquid pipe is formed to recover the gaseous refrigerant absorption heat and return it to the low temperature heat exchanger outlet side of the main dilute liquid pipe, so that the internal pressure of the bleed tank can be maintained lower than the absorber internal pressure, and the low temperature can be maintained. It is possible to avoid a decrease in the amount of heat exchanged in the heat exchanger, and it is also possible to reduce the amount of heating in the regenerator. It is possible to improve the coefficient of performance of the water machine, and also to remove non-condensable gas to the outside of the machine.

In the embodiment shown in the drawings, the present invention has been explained using a dual-effect absorption chiller/heater, but a single-effect chiller/heater may also be constructed in the same manner.

[Brief explanation of drawings]

The drawing is a circuit explanatory diagram of a dual-effect absorption chiller/heater showing an embodiment of the present invention. 6...High temperature heat exchanger, 7...Low temperature heat exchanger, 1
7... Main absorption liquid circulation path, 18... Main dilute liquid pipe line, 1
9...Sub-absorption liquid circulation path, 20...Bleed tank, 21...
...Gas separation layer, 28...Subdilute liquid pipe line.

Claims (1)

[Claims] 1 A refrigerating cycle is constructed by connecting a regenerator, condenser, evaporator, absorber, low-temperature heat exchanger, and high-temperature heat exchanger through a main dilute liquid pipe, a main absorption liquid circulation path, a refrigerant circulation path, etc. In an absorption chiller/hot water machine having a degassing device that guides non-condensable gas accumulated in the absorber into an air bleed tank and releases it outside the machine via a gas separation tank, the main absorption liquid circulation path of the absorption chiller/heater Another auxiliary absorption liquid circulation path is formed by bypassing from the main diluted liquid pipe and passing through the gas bleed tank and the gas separation tank, and at the same time, it bypasses from the main dilute liquid pipe and passes through the gas bleed tank to the outlet side of the low-temperature heat exchanger. Another sub-dilute liquid pipe is formed to cool the absorption liquid dripped into the bleed tank via the sub-absorbent liquid circulation path with the dilute liquid flowing in the sub-dilute liquid pipe, and A degassing device for an absorption chiller/heater, characterized in that the diluted liquid passing through the tank is configured to flow to the outlet side of a low temperature heat exchanger.