JPS6135898Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a direct-fired dual-effect absorption refrigerator, in which a part of the diluted liquid diverted from the high-temperature heat exchanger is communicated with the gas phase of the condenser for auxiliary regeneration. The absorbent liquid is regenerated in the heat exchanger using the heat of the combustion exhaust gas from the high-temperature regenerator, and the regenerated absorption liquid is combined with the concentrated liquid from the low-temperature regenerator before the low-temperature heat exchanger without being led to the high-temperature regenerator or the low-temperature regenerator. The purpose is to recover the heat of the combustion exhaust gas and improve the regeneration efficiency of the absorption liquid in the regenerator.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. 1 is a high-temperature regenerator that is heated by a heat source fluid and heats and separates the refrigerant from the diluent to regenerate the intermediate liquid;
2 is a low-temperature regenerator that reheats the refrigerant vapor sent out from the high-temperature regenerator 1 as a heat source and further separates the intermediate liquid refrigerant to regenerate a concentrated liquid; 3 is a low-temperature regenerator that uses cooling water to regenerate the refrigerant 1; , 2 is a condenser that condenses and cools the refrigerant flowing in; 4 is an evaporator that obtains cold water for air conditioning by utilizing latent heat when dispersing and vaporizing the liquid refrigerant from the condenser 3; 5; an absorber 6 that sprays the concentrated liquid regenerated by the low-temperature regenerator 2 and absorbs refrigerant vapor in the evaporator 4 to maintain a low pressure inside the evaporator 4 and to continuously supply cold water;
7 is a high-temperature heat exchanger that receives heat between the dilute liquid returning from the absorber 5 to the high-temperature regenerator 1 and the intermediate liquid flowing from the high-temperature regenerator 1 to the low-temperature regenerator 2; 7 is the absorber 5;
This is a low-temperature heat exchanger that exchanges heat between the dilute liquid that returns to the high-temperature regenerator 1 and the concentrated liquid that flows from the low-temperature regenerator 2 to the absorber 5.
and a refrigerant pipe line consisting of a refrigerant liquid pipe 11 having a refrigerant pump 10, dilute liquid pipes 13, 14, 15 having an absorption liquid pump 12, intermediate liquid pipes 16, 17, and concentrated liquid pipes 18, 19, which are airtightly connected. The refrigeration cycle is made up of And the absorption liquid is
As shown by solid line arrows, high temperature regenerator 1, intermediate liquid pipe 16, high temperature heat exchanger 6, intermediate liquid pipe 17, low temperature regenerator 2, concentrated liquid pipe 18, low temperature heat exchanger 7, concentrated liquid pipe 1
9. Absorption liquid circulation that sequentially flows through the absorber 5, diluted liquid pump 12, diluted liquid pipe 13, low temperature heat exchanger 7, diluted liquid pipe 14, high temperature heat exchanger 6, diluted liquid pipe 15 and returns to the high temperature regenerator 1 road 20. Reference numeral 21 designates another absorption liquid pipe line which is formed in parallel with the absorption liquid circulation path 20 by connecting one end to the dilute liquid pipe 15 and the other end to the concentrated liquid pipe 18. An auxiliary regenerator 22 having an inlet and outlet for absorbing liquid is provided at the bottom. Note that the absorption liquid pipe 21 has one end connected to the dilute liquid pipe 13.
Or connect the other end to intermediate liquid pipe 16
Alternatively, it is also possible to form it by connecting it to the concentrated liquid pipe 18, but the absorption liquid pipe line 2 formed in this way
1, when it is installed in the auxiliary regenerator 22, it is not preferable because it has the disadvantage that it is difficult to improve the regeneration efficiency of the absorption liquid in the low-temperature regenerator 2, and it is difficult to increase the temperature of the dilute liquid flowing into the auxiliary regenerator 22. . The absorption liquid distribution section of the auxiliary regenerator 22 is provided with passages 23, 23, . Connected to 3. Further, 26 is a combustion gas exhaust stack, and 27 is a flue, each of which is connected to the passage 2.
It communicates with the entrance and exit of 3, 23...

Generally, in a direct-fired dual-effect absorption refrigerator, the temperature of the absorption liquid in the high-temperature regenerator 1 is set to about 160°C, whereas the temperature of the combustion exhaust gas released into the atmosphere from the combustion gas exhaust stack 26 is set to about 160°C. is 250℃,
The exhaust gas still has sufficient residual heat. This residual heat amounts to approximately 21% of the amount of heat contained in the driving fuel of the direct-fired dual-effect absorption refrigerator. In the present invention, the gas phase part 24 of the auxiliary regenerator 22 is connected to the condenser 3, and the pressure in the condenser is made to be approximately the same, so that the vapor pressure in the auxiliary regenerator 22 is lower than that of the high temperature regenerator. 1
The vapor pressure is maintained below the internal vapor pressure. Therefore, the boiling temperature of the dilute liquid heated and regenerated in the auxiliary regenerator 22 is lower than the boiling temperature of the dilute liquid in the high temperature regenerator 1,
The heat discharged from the combustion gas stack 26 can be utilized. For example, the temperature of the diluted liquid in the high temperature regenerator 1 is 160℃.
In this case, the boiling temperature of the dilute liquid in the auxiliary regenerator 22 is 75°C.
It is possible to reduce the fuel by 5.3% to 7.4% by utilizing the heat value of the fuel until the combustion exhaust gas released into the atmosphere from the flue 27 reaches 95°C to 145°C.

Note that the temperature difference between the combustion exhaust gas and the dilute liquid in the auxiliary regenerator 22 is smaller than the temperature difference between the combustion gas and the dilute liquid in the high-temperature regenerator 1, so the auxiliary regenerator 22 has a sufficient heat transfer area. Direct-fired high-temperature regenerator 1
Compared to the above, the structure has a large number of combustion exhaust gas passages 23, 23... arranged densely, and the flow resistance of the passages increases, so that the absorption liquid cannot flow between the passages 23, 23... while being sufficiently stirred. First, it has the disadvantage of a low heat exchange rate. In the present invention, as shown by the broken line arrow, the diluted liquid that has received heat from the high-temperature heat exchanger 6 and has been heated to a temperature exceeding 90°C is supplied to the auxiliary regenerator 22, and the diluted liquid immediately after flowing into the regenerator is supplied to the auxiliary regenerator 22. The liquid boils violently, causing a so-called self-flashing phenomenon in which the refrigerant vapor becomes countless bubbles and separates from the dilute liquid, and the absorption liquid is vigorously stirred in the auxiliary regenerator 22, and the absorption liquid and the combustion exhaust gas passage 23 are stirred violently. , 23...The exhaust gas passage 2 is designed to improve the heat transfer coefficient with the outer wall.
3, 23... are densely packed to make the heat transfer area sufficiently wide while compensating for the increase in flow resistance, which has the effect of improving the heat recovery rate of the auxiliary regenerator 22 and the effect of improving the regeneration efficiency.

Moreover, the present invention condenses the diluted liquid separated at the outlet side of the high temperature heat exchanger 6 in the auxiliary regenerator 22 and directs it to the high temperature regenerator 1 and the low temperature regenerator 2, but before the low temperature heat exchanger 7. While the concentrated liquid from the low-temperature regenerator 2 is combined with the concentrated liquid from the low-temperature regenerator 2, a part of the diluted liquid is concentrated in turn in the high-temperature regenerator 1 and the low-temperature regenerator 2. In step 2, the amount of heat of the heat source for raising the temperature of the absorption liquid to boiling temperature can be saved, and the regeneration efficiency of these regenerators 1 and 2 can be improved accordingly. As described above, the present invention has the effect of efficiently recovering the heat of combustion exhaust gas with the auxiliary regenerator and the effect of comprehensively increasing the regeneration efficiency of the auxiliary regenerator, high temperature regenerator, and low temperature regenerator. be. The present invention provides a practically useful direct-fired dual-effect absorption refrigerator.

[Brief explanation of drawings]

The drawing is a circuit explanatory diagram of a direct-fired dual-effect absorption refrigerator showing an embodiment of the present invention. 1...High temperature regenerator, 2...Low temperature regenerator, 3...
Condenser, 5...Absorber, 6...High temperature heat exchanger, 7
...Low temperature heat exchanger, 12 ...Absorption liquid pump, 1
3, 14, 15... Dilute liquid pipe, 16, 17... Intermediate liquid pipe, 18, 19... Concentrated liquid pipe, 20... Absorption liquid circulation path, 21... Absorption liquid pipe line, 22... Auxiliary regeneration Vessel, 23...Aisle.

Claims (1)

[Scope of utility model registration request] Equipment such as high-temperature regenerators, low-temperature regenerators, condensers, evaporators, absorbers, high-temperature heat exchangers, low-temperature heat exchangers, absorption liquid pumps, etc., as well as dilute liquid pipes, intermediate liquid pipes, concentrated liquid pipes, and refrigerant pipes. In a dual-effect absorption refrigerator, which is connected to a refrigeration cycle by connecting the diluted liquid pipe with An auxiliary regenerator is provided in the middle of the absorption liquid pipe line connected to the liquid pipe, and has an absorption liquid inlet/outlet at the bottom. 1. A direct-fired dual-effect absorption refrigerating machine, characterized in that a passage is provided and a gas phase portion of the auxiliary regenerator is connected to a condenser.