KR960013203B1 - Absorption refrigeration system - Google Patents

Abstract

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Description

Gas extraction device of absorption chiller

The figure is a circuit block diagram of the absorption chiller which shows one Example of this invention.

* Explanation of symbols for main parts of the drawings

1: evaporative absorption body 2: evaporator

3,4 absorber 8: condenser

44,45,46: non-condensing gas tank 47, 48, 49: ejector

The present invention relates to a gas extraction apparatus for an absorption refrigerator provided with a plurality of absorbers.

As a conventional technique, for example, Japanese Patent Laid-Open No. 60-240972 discloses the extraction of noncondensable gas in a freezer body at the same time as the refrigerant vapor in a gas extraction chamber, and in the separation chamber. Disclosed is a non-condensing gas discharge device for an absorption chiller that separates and stores non-condensable gases in a container.

Further, an absorption chiller in which an evaporator is provided in the center of the evaporator and the evaporator is provided on both sides of the evaporator and the refrigerant vaporized in the evaporator is absorbed by each absorber is disclosed in Japanese Laid-Open Patent Publication No. 52-51317. have.

For example, in order to discharge the non-condensable gas of the absorption chiller disclosed in Japanese Unexamined Patent Publication No. 52-51317, the non-condensed gas discharge device disclosed in Japanese Unexamined Patent Publication No. 60-240972 is absorbed. It was installed in the refrigerator and connected to the gas extraction chamber of each non-condensing gas exhaust device and each absorber. In the case of the pipe connection as described above, for example, when non-condensable gas enters the absorber from the outside and the pressure of the non-condensed gas is high, the non-condensable gas is removed from the gas extraction chamber only from the absorber. For this reason, the non-condensable gas does not escape from the other absorber. Therefore, a problem arises in that the pressure of the non-condensable gas of the other absorber is also increased and the refrigerant absorbing capacity is lowered, thereby greatly reducing the coefficient of performance of the absorption refrigerator.

An object of the present invention is to extract a non-condensable gas of an absorption chiller equipped with a plurality of absorbers from each absorber, so as to avoid a significant drop in the coefficient of determination even when a large amount of non-condensable gas is generated.

In order to solve the above problems, the present invention provides a gas extraction apparatus for an absorption chiller having a plurality of non-condensable gas tanks (46, 44) for extracting and storing non-condensable gas from each of the absorbers (3) and (4). To provide.

In addition, the ejectors 49, 47 and 48 which are connected to the respective absorbers 3, 4 and the condenser 8 and extract the non-condensable gas from the absorbers 3, 4 and the condenser 8, respectively. And a non-condensable gas tank (46, 45, 44) having these, and ejectors (49), (47), (48), and storing non-condensable gas. .

Referring to the operation according to the above configuration is as follows.

In operation of the absorption refrigerator, the non-condensing gas of each absorber (3) and (4) is extracted from the non-condensing gas tank (46) (44), which are installed separately, so that each non-condensing occurs even if a pressure difference occurs in each absorber. By the gas tanks 46 and 44, it is possible to continuously extract the non-condensable gas from each absorber 3 and 4, and even when a large amount of non-condensable gas is generated in the absorber 3 on the other side, Extraction of the non-condensable gas of the absorber 4 is continued by the non-condensable gas tank 44 so as not to interfere, and the drastic reduction of the coefficient of performance due to mass generation of non-condensable gas can be avoided.

In operation of the absorption refrigerator, non-condensing gases of the absorbers 3, 4 and the condenser 8 are extracted by separate ejectors 49, 47 and 48, respectively, and the pressure is applied to each absorber and the condenser. Even when a difference occurs, it is possible to continuously perform extraction, and even when a large amount of non-condensable gas is generated in the absorber 3 and the pressure is increased, extraction of the non-condensed gas of the other absorber 4 or the condenser 8 is performed. Is continuously carried out by the ejectors 47 and 48 so as not to interfere, and the non-condensable gas is stored in each of the non-condensable gas tanks 44, 45, and 46, and the coefficient of performance due to the mass generation of the non-condensed gas is The drastic fall of the can be avoided.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Shown in the figure is an absorption chiller for a dual effect, in which water (H ₂ O) is used as the refrigerant and lithium bromide (LiBr) solution is used as the absorbent (absorbent).

In the drawing, reference numeral 1 denotes an evaporator absorber, numeral 2 denotes an evaporator provided at the center portion of the vaporizer absorber 1, and reference numerals 4 denote absorbers provided at both sides of the evaporator 2, respectively. ) Is a high temperature regenerator having a gas burner (5B), (6) is a regenerative condensing body, (7) (8) is a low temperature regenerator and condenser installed in the regenerative condensing body (6), and (10) is a high temperature heat exchanger. (11) is a low temperature heat exchanger, (12) to (17) is an absorbent liquid pipe, (15M is an absorbent liquid conveying pump, (12M) is an absorbent liquid conveying pump, and (18) to (20) is a refrigerant pipe, and (20M) Denotes a refrigerant pump, and 21 is a cold water pipe, each of which is connected to a pipe as shown in the figure. Reference numeral 22 denotes a cooling water pipe, and absorber heat exchangers 23 and 24 and a condenser heat exchanger 25 are provided in the middle of the cooling water pipe 22. Numeral 26 denotes a heat fuel pipe connected to the gas burner 5B, and numeral 30 denotes a fuel material control valve.

32 is an intermediate absorbent liquid conveying tube, 33 is a refrigerant conveying tube, and 34 is an overflow tube connected between the refrigerant cap 35 and the absorbing liquid cap 36; Reference numeral 37 denotes a communication pipe connected between the cold water pipe 21 and the cooling water pipe 22, and each of the pipes is provided with open / close valves 32A, 33A, 34A, and 37A, respectively. Then, these open / close valves 32A, 33A, 34A, 37A are closed at the time of cold water supply to the air conditioning load and open at the time of hot water supply.

Reference numeral 38 denotes a refrigerant tank, and the refrigerant tank 38 is connected to the refrigerant pipes 19, 20 and the evaporative absorption body 1 through respective pipes 41, 42, and 43. .

44, 45, and 46 are non-condensing gas tanks, respectively, and ejectors 47, 48, 49 are provided above the gas tanks 44, 45, and 46, respectively. The absorbent liquid transfer tubes 51, 52, 53, and 54 are connected between the ejectors 47, 48, 49, and the absorbent liquid tube 12 on the discharge side of the absorbent liquid pump 12M. .

51A is a heat exchanger, and the thin absorbent liquid is cooled by cooling water in this heat exchanger 51A. In addition, gas extraction pipes 55, 56, and 57 are connected to each other between the ejectors 47, 48, and 49, the absorber 4, the condenser 8, and the absorber 3, respectively. It is. (58) (59) and (60) are non-condensing gas tanks (44), (45) and (46), respectively, and (61) (62) and (63) are non-condensing gas, respectively. It is a separation chamber with suwa refrigerant. Here, palladium cells (not shown) for discharging hydrogen gas are provided at the upper portions of the non-condensable gas tanks 44, 45, and 46. Discharge pipes 65 to 68 are connected between each of the storage chambers 58, 59 and 60, and the discharge pump 64, and each of the discharge pipes 65 to 68 has an opening / closing valve, respectively. 71 to 74 are provided.

In addition, a pipe 75 is connected between the gas extraction pipe 57 and the discharge pipe 60, and an opening / closing valve 76 is provided in the middle of the pipe 75. In addition, an absorption liquid conveying pipe 77 is connected between the bottoms of the non-condensing gas tanks 44, 45 and 46 and the absorber 3.

During operation of the absorption refrigerator, the refrigerant evaporated in the high temperature regenerator 5 flows to the condenser 8 via the low temperature regenerator 7 and heat exchanges with the water flowing through the condenser heat exchanger 25 in the same manner as the conventional absorption refrigerator. After the condensation is liquefied, it flows to the evaporator 2 through the refrigerant pipe 19. The refrigerant exchanges heat with water in the cold water pipe 21 to evaporate, and the water in the cold water pipe 21 is cooled by the heat of vaporization. Then, the cold water circulates in the load and the cooling operation is performed. In addition, the refrigerant evaporated in the evaporator 2 is absorbed by the absorber 3 and 4 as the absorbent liquid. Then, the absorbent liquid whose absorbed refrigerant is reduced in concentration is sent to the high temperature regenerator 5 via the low temperature heat exchanger 11 and the high temperature heat exchanger 10 by the operation of the absorption liquid pump 12M.

The absorbent liquid entering the high temperature regenerator 5 is heated by the burner 5B to evaporate the refrigerant, and the medium absorbed liquid passes through the high temperature heat exchanger 10 and enters the low temperature regenerator 11. The absorption liquid is heated by the refrigerant vapor flowing from the high temperature regenerator 5 through the refrigerant pipe 18, and the refrigerant is evaporated and separated to increase the concentration. The absorbent liquid (hereinafter referred to as "concentration") at a high concentration decreases in temperature via the low temperature heat exchanger (11) and is sent to the absorbers (3) and (4) for dispersion.

As described above, when the absorption chiller is in operation, a part of the absorption liquid discharged from the absorption liquid pump 12M passes through each of the ejectors 47, 48 through the absorption liquid transfer plates 51, 52, 53, and 54. And (49). For this reason, the non-condensable gases of the absorber 4, the condenser 8, and the absorber 3 are discharged to the ejector 47, 48, and 49 respectively. Falls through. And the non-condensable gas which flowed down with the absorbing liquid isolate | separates with the absorbing liquid in each separation chamber 61, 62, and 63, and accumulates in the storage chambers 58, 59, and 60. FIG. In addition, the absorbent liquid separated from the non-condensed gas flows through the absorbent liquid transport pipe 77 to the absorbent liquid inlet 36. Hydrogen gas in the non-condensed gas accumulated in the storage chambers 58, 59, and 60 is discharged from the palladium cell, and the pressure in each of the storage chambers 58, 59, and 60 is gradually increased by other non-condensable gases. Rises. Then, the discharge pump 64 is operated when the pressure becomes higher than the predetermined pressure or at each preset time, and the open / close valves 71 to 74 are opened to discharge the non-condensable gas to the outside.

In addition, when the absorption chiller is in operation, for example, a leak occurs in the evaporative absorption body 1, and a large amount of non-condensable gas invades the absorber 3 and the pressure is increased, the non-condensed gas of the absorber 3 is increased. Is discharged to the ejector 49, and the non-condensable gases of the other absorbers 4 and the condenser 8 are not ejected from the pressure riser of the absorber 3 so as not to interfere with the pressure rise of the absorber 3, respectively. By 48). Moreover, even when a large amount of non-condensable gas invades the absorber 4 and the condenser 8 and the pressure rises, extraction of the non-condensed gas of the other absorber is performed so as not to interfere.

According to this embodiment, during operation of the absorption chiller, non-condensable gas from each absorber (3) (4) and condenser (8) is discharged separately by each of the ejectors (49), (47) and (48), and the pressure is reduced. The non-condensable gas can be favorably withdrawn from each of the different absorbers 3 and 4 and the condenser 8, respectively. In addition, even when a large amount of non-condensable gas invades the absorber 3 (4) or the condenser 8, and the pressure difference between the absorber 3, the absorber 4, and the condenser 8 becomes large, each ejector 49 ( 47) and (48), respectively, can extract the non-condensable gas, so that, even if the pressure of any of the absorbers (3) (4) and the condenser (8) is increased, other absorbers or condensers ( The non-condensable gas can be extracted continuously from 8), and the drastic reduction of the coefficient of performance of the absorption chiller by the non-condensable gas can be avoided.

In addition, this invention is not limited to the said Example, For example, as shown in FIG. 1 to each absorber 3 and 4, without piping the non-condensing gas tank 45 to the condenser 8, for example. Similarly, when the non-condensing gas tanks 46 and 44 are pipe-connected and the non-condensing gas is extracted from each absorber 3 and 4 by the ejector 49 and 47, a large amount of non-condensing gas is applied to one absorber. When the condensation gas intrudes and the pressure is increased, the non-condensable gas can be continuously extracted from the other absorber, and as a result, a significant decrease in the coefficient of performance of the absorption chiller by the non-condensable gas can be avoided.

In addition, the number of absorbers and evaporators provided in the evaporative absorber 1 is not limited to the above embodiment, for example, two evaporators are provided, and absorbers are provided on both sides of each evaporator, Even when the non-condensable gas tank is connected to the pipe, the same effects as in the above embodiment can be obtained.

The present invention is a scavenging device of an absorption chiller configured as described above, and is provided with a plurality of non-condensing gas tanks connected to a plurality of absorbers, each of which extracts and stores non-condensing gas from each of the absorbers, thereby providing pressure to each absorber. Even when a difference occurs, non-condensable gas can be continuously extracted from each absorber by each non-condensable gas tank, and in the case where a large amount of non-condensable gas enters into one of the absorbers, the pressure does not interfere with the increase in pressure. Unexpectedly, the gas extraction from the other absorber can be performed by the non-condensing gas tank, and as a result, the drastic reduction of the coefficient of performance due to the retention of the non-condensing gas of each absorber can be avoided.

In addition, by providing a plurality of absorbers provided in the evaporative absorption body, a plurality of ejectors each connected to a condenser, and a plurality of non-condensable gas tanks having these ejectors and storing non-condensable gas, each absorber and pressure Each of the different condensers can continuously extract the non-condensable gas by the ejector and store it in each of the non-condensable gas tanks. The noncondensable gas can be extracted from the absorber and the condenser, thereby avoiding the interference by the absorber or the condenser that has a high pressure, thereby avoiding a significant drop in the coefficient of performance.

Claims (2)

A plurality of absorbers (3) (4), a regenerator, a condenser (8), and an evaporator (2) are connected to each other, and a refrigeration cycle is connected to the plurality of absorbers (3) (4) in an absorption refrigerator. And a plurality of non-condensing gas tanks (46) (44) for extracting and storing the non-condensing gas from each of the absorbers (3) and (4), respectively. Absorption chiller having a refrigeration cycle provided with an evaporator (2) and a plurality of absorbers (3) (4) provided in the evaporation absorber (1), and a regenerator and a condenser (8) connected to the evaporation absorber (1). A plurality of ejectors (49) (47) connected to respective absorbers (3) and (4) and condenser (8) for extracting non-condensable gases from the absorbers (3) and (4). And a plurality of non-condensable gas tanks 46, 45, 44 having these ejectors 49, 47, 48, and storing non-condensable gas. Gas extraction device.