JP3469144B2 - Absorption refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called reverse cycle type vapor absorption refrigerating machine, which is connected and arranged so that an absorbing liquid is pumped from an absorber to a low temperature regenerator and further pumped to a high temperature regenerator. Specifically, the absorption liquid circulating in the reverse flow is concentrated by a concentrator and a concentrating boiler, and heat is recovered, thereby making the device compact,
The present invention relates to an absorption refrigerator, which is designed to save energy. Here, the absorption refrigerator includes an absorption chiller / heater.

[0002]

2. Description of the Related Art Conventionally, a steam-type double-effect absorption refrigerator shown in FIG. 9 has been known. This absorption refrigerator has an absorption liquid (for example, an aqueous lithium bromide solution).
Flows from the absorber a to the high temperature regenerator e via the low temperature regenerator c, thus forming a reverse cycle. Explaining the absorption cycle in this absorption refrigerator, first, the absorption liquid (rare absorption liquid) whose concentration is diluted by absorbing a large amount of refrigerant vapor in the absorption device a is fed from the absorption device a to the low temperature heat exchanger b. After being heated by the low temperature heat exchanger b, it is fed to the low temperature regenerator c. The rare absorbent is the low temperature regenerator c
At low temperature, the refrigerant is regenerated at a low temperature and a part of the absorbed refrigerant is released to increase the concentration by that amount to become an intermediate concentration absorbent (intermediate absorbent). Next, the intermediate absorbent is fed from the low temperature regenerator c to the high temperature heat exchanger d, heated by the high temperature heat exchanger d, and then fed to the high temperature regenerator e.

The intermediate absorbing liquid is regenerated at high temperature in the high temperature regenerator e, releases a part of the refrigerant (for example, water vapor) which is being absorbed, and has a higher concentration, so that the absorbing liquid has a high concentration (concentrated absorbing liquid). ). Then, this concentrated absorbent is returned to the heating side of the high temperature heat exchanger d as a heating source for heating the intermediate absorbent, and further the rare absorbent is heated to the heating side of the low temperature heat exchanger b. After being returned as a heating source, it is returned to the absorber a. The returned concentrated absorbent is dispersed in the absorber a, and while being cooled by the cooling water, it absorbs the refrigerant vapor again to become the rare absorbent.

In such a steam double-effect absorption refrigerator, high temperature steam (steam) is supplied from the steam boiler f to the high temperature regenerator e as a heating source. The intermediate absorption liquid is heated to release the absorbed refrigerant, and the released refrigerant vapor is used as a heat source in the low temperature regenerator c by the low temperature regenerator c and then returned to the condenser g. Is done and condensed. Condenser g
The refrigerant liquid (for example, water) from the above enters the evaporator h, and the condensed refrigerant liquid is sprayed by the refrigerant pump to the heat transfer tubes (where water is flowing) of the evaporator h to obtain cold water. Also,
And absorbing liquid pipe i from the low-temperature regenerator c, bypass pipe k is provided for connecting the absorption liquid pipe j heating side between the hot heat exchanger d and the low temperature heat exchanger b, and low-temperature regenerator c A part of the intermediate concentrated absorption liquid that comes out and is supplied to the high temperature regenerator e is configured to be bypassed to the concentrated absorption liquid pipe that returns to the absorber a.

[0005]

However, the steam-type absorption refrigerating machine in which such a steam boiler f is combined has the following inconveniences. The steam boiler f itself is large in size, which leads to an increase in size of the entire absorption refrigerator. Moreover, in order to operate the steam boiler f, it is contrary to the request for energy saving such that it is necessary to supply water to a system different from the system of the absorption refrigerator, recover the steam drain after heating, and inject chemicals. Ancillary equipment for them is required, which promotes upsizing of the device. However, the steam boiler f only contributes to the absorption refrigerator by merely supplying the heating source, and the effect commensurate with the fuel consumption for combustion in the steam boiler f is sufficiently obtained. It is hard to say that In addition, in terms of laws and regulations, it is troublesome that a predetermined qualified person as a handler and inspection are required.

The present invention has been made in view of the above points, and an object of the present invention is to make full use of the function of a boiler to reduce the fuel consumption per cooling output and to save energy, and at the same time, the entire absorption refrigerator. An object of the present invention is to provide an absorption refrigerator that can be made compact and can be easily handled.

[0007]

In order to achieve the above object, an absorption refrigerator according to the present invention has a low-temperature heat exchanger, a low-temperature regenerator, a high-temperature heat exchanger, and a high-temperature regenerator for absorbing liquid in order from the absorber. It is configured to circulate to the absorber through the high-temperature heat exchanger and the low-temperature heat exchanger, and part of the intermediate concentrated absorption liquid that exits the low-temperature regenerator and is supplied to the high-temperature regenerator is returned to the absorber. In a reverse cycle vapor absorption refrigerator equipped with a bypass pipe for bypassing the liquid pipe, at least a part (part or all) of the absorption liquid from the high temperature regenerator in the absorption liquid pipe returning from the high temperature regenerator to the high temperature heat exchanger. ) Is extracted and supplied to a solution concentrator described later, and a solution concentrator that heat-concentrates the absorption liquid from the first supply means are connected in series (series), and the first supply means and the solution are connected. Between the high temperature regenerator and the condenser A first additional heat exchanger for exchanging heat between the absorbing liquid and the absorbing liquid that has been heated and concentrated in the solution concentrating boiler described below and heat-exchanged in the second additional heat exchanger described later is further provided Second supply means and second supply means for extracting at least a part of the absorption liquid returning from the solution concentrator to the first additional heat exchanger into the absorption liquid pipe returning to the heating exchanger and supplying it to the solution concentration boiler described later. Connect the solution condensing boiler for heating and concentrating the absorption liquid from
A second additional heat exchanger for exchanging heat between the concentrated liquid from the solution concentrator and the heat-concentrated absorption liquid discharged from the solution condensing boiler is provided between the second supply means and the solution condensing boiler. The solution condensing boiler and the second additional heat exchanger were connected by an absorption liquid pipe so that the heat-concentrated absorption liquid was returned to the heating side of the second addition heat exchanger, while it was heated and concentrated in the solution concentration boiler. The solution condensing boiler and the solution concentrator are connected by a refrigerant vapor pipe so that the refrigerant vapor evaporated from the absorbing liquid is supplied to the solution concentrator as a heating source, and the solution condensing boiler is heated and condensed by the solution condensing boiler by the second additional heat exchanger. In order to return the absorbed heat-exchanged liquid to the heating side of the first additional heat exchanger,
The additional heat exchanger and the first additional heat exchanger are connected by an absorption liquid pipe, and on the other hand, the solution condensor is connected to the solution concentrator so that the refrigerant vapor evaporated from the absorption liquid in the solution concentrator is supplied as a heating source of the high temperature regenerator. The high temperature regenerator is connected to the high temperature regenerator by a refrigerant vapor pipe (see FIG. 1).

The term "solution concentrating boiler" as used herein means a function of heating a concentrated absorbent by burning fuel, a function of releasing a refrigerant absorbed by the heating as a refrigerant vapor, and a function of heating the concentrated absorbent. What has the function of withstanding the internal pressure of

In the above-mentioned absorption refrigerator, the absorption liquid pipe on the heated side of the high temperature heat exchanger, the absorption liquid pipe on the heated side of the first additional heat exchanger, and the absorption liquid on the heated side of the second additional heat exchanger. Exhaust gas for liquid recovery and exhaust gas for heat recovery by connecting a bypass pipe to at least one of the inlet absorption liquid pipe and the outlet absorption liquid pipe of the high temperature regenerator, and exchanging heat with the exhaust gas emitted from the solution concentration boiler in the bypass pipe. A heat exchanger may be provided (see FIG. 2). That is, the exhaust gas heat exchangers are provided individually or in combination (simultaneously). In this case, the exhaust gas heat exchanger provided in parallel with the heat exchanger acts as a heat recovery device, and the exhaust gas heat exchange provided between the inlet absorbent liquid pipe and the outlet absorbent liquid pipe of the high temperature regenerator. The vessel acts as an auxiliary regenerator. In the present invention, the sensible heat of the combustion exhaust gas from the boiler can be effectively recovered, and the energy can be reduced.

In these absorption refrigerators, the absorption liquid piping on the heated side of the low temperature heat exchanger, the absorption liquid piping on the heated side of the high temperature heat exchanger, and the absorption side of the heated side of the first additional heat exchanger. Connect a bypass pipe to at least one of the liquid pipes,
The bypass pipe may be provided with a refrigerant heat recovery device for exchanging heat with the condensed refrigerant from the low temperature regenerator, the high temperature regenerator or the solution concentrator (see FIG. 3). That is, the refrigerant heat recovery devices are provided alone or in combination (simultaneously) in parallel with the heat exchanger. According to the present invention, the heat of the condensed refrigerant (refrigerant drain) can be effectively recovered to reduce energy.

In the above structure, particularly, an exhaust gas heat exchange for recovering heat by connecting a bypass pipe to the absorption liquid pipe on the heated side of the high temperature heat exchanger and exchanging heat with the exhaust gas from the solution concentrating boiler to the bypass pipe. The cooling device is provided, and further, a bypass pipe is connected to the absorption liquid pipe on the heated side of the low temperature heat exchanger, and a refrigerant heat recovery device for exchanging heat with the condensed refrigerant from the low temperature regenerator is provided in the bypass pipe, that is, It is preferable that the exhaust gas heat exchanger is provided in parallel with the high temperature heat exchanger, and the refrigerant heat recovery device is provided in parallel with the low temperature heat exchanger (see FIG. 4). In this invention,
It is possible to effectively recover the combustion exhaust gas from the boiler and the retained heat of the refrigerant drain, and it is possible to reduce energy.

Further, at least one of the absorbent liquid pipe on the heated side of the low temperature heat exchanger, the absorbent liquid pipe on the heated side of the high temperature heat exchanger, and the absorbent liquid pipe on the heated side of the first additional heat exchanger. A bypass pipe is connected, and a refrigerant heat recovery device for exchanging heat with the condensed refrigerant from the low temperature regenerator, the high temperature regenerator or the solution concentrator is provided in the bypass pipe, and the absorption liquid is used in the solution concentrator, the high temperature regenerator and the low temperature regenerator. Each of the condensed refrigerant heat-exchanged with, is connected in a condensed refrigerant pipe so as to be merged in order and introduced into the lower refrigerant heat recovery device in the flow direction of the condensed refrigerant,
As a configuration in which the lowest refrigerant heat recovery unit and the condenser are connected by a confluent condensing refrigerant pipe, the condensing refrigerant (refrigerant drain) is finally introduced so that the condensing refrigerant that has undergone heat exchange and merges is introduced into the condenser. The heat of can be effectively exchanged and recovered to reduce energy (see FIG. 5).

In these absorption refrigerators, a plurality of blocks in which an absorber and an evaporator are combined are provided, and cold water, cooling water and absorbing liquid are provided in a plurality of blocks in series (series).
So that each block is connected to each other by a cold water pipe, a cooling water pipe, and an absorbing liquid pipe (see FIG. 6). Further, a plurality of blocks in which an absorber and an evaporator are combined are provided, and cold water and absorbing liquid are supplied in series to a plurality of blocks, and cooling water is supplied to a plurality of blocks in parallel. As described above, each block may be connected by a cold water pipe, an absorbing liquid pipe, and a cooling water pipe (see FIG. 7).

Further, the condenser and the absorber may be connected by a cooling water connecting pipe so that the cooling water is supplied from the condenser to the absorber (see FIG. 8). In these absorption refrigerators, it is preferable to use a once-through boiler having a simple structure, a small size, and easy handling as the solution concentrating boiler (see FIGS. 1 to 5 and 8).

Since the absorption refrigerating machine of the present invention is constructed as described above, it is not necessary to provide a special water supply facility in the boiler and recovery of steam drain is also unnecessary. Also,
As a result, no chemical injection equipment is required, and the boiler is downsized. As a result, the boiler can be integrated with the absorption refrigerator.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in the case of an absorption refrigerator, but the present invention is not limited to the case of an absorption refrigerator, and may be applied to an absorption cold / hot water machine. It is applicable. FIG. 1 shows a first embodiment of the present invention.
1 shows an absorption refrigerator according to a form. In this embodiment, an absorber 1, a pump (dilute liquid pump) 2, a low temperature heat exchanger 3, a low temperature regenerator 4, a pump (intermediate liquid pump) 5, a high temperature heat exchanger 6, a high temperature regenerator 7, and a condenser 8 are provided. , Evaporator 9, refrigerant pump 1
0 and a reverse cycle double-effect absorption refrigerator having components such as an absorption liquid pipe connecting these devices, a refrigerant pipe, etc., to a solution concentrator 30, a once-through boiler 40 as a solution concentration boiler, and a first supply. A first absorption liquid (concentrated liquid) pump 13 as a means, a first additional heat exchanger 21, a second absorption liquid (concentrated liquid) pump 14 as a second supply means, and a second additional heat exchanger 22 are combined and integrated. It has been transformed. In addition, in FIG. 1, the arrow attached to the solid line indicates the flow direction of the absorption liquid or the refrigerant liquid, and the arrow attached to the broken line indicates the flow direction of the refrigerant vapor or the mixture of the refrigerant vapor and the condensed refrigerant (refrigerant drain). .

The absorption liquid circulation cycle will be described in order. First, the diluted absorbent, which has been diluted in concentration by absorbing a large amount of refrigerant vapor in the absorber 1, is absorbed in the absorber 1 by the diluted liquid pump 2.
Is fed from the low temperature heat exchanger 3 to the low temperature regenerator 4 after being heated by the low temperature heat exchanger 3. Then, this rare absorption liquid is regenerated at a low temperature in the low temperature regenerator 4 and releases a part of the absorbed refrigerant to increase its concentration to become an intermediate absorption liquid having an intermediate concentration.

Next, most of this intermediate concentrated absorption liquid is sent from the low temperature regenerator 4 to the high temperature heat exchanger 6 by the intermediate absorption liquid pump 5, heated by this high temperature heat exchanger 6 and then regenerated at high temperature. It is sent to the container 7. The intermediate concentrated absorption liquid is regenerated at high temperature in the high temperature regenerator 7 and a part of the absorbed refrigerant is released to further increase the concentration to become a high concentration concentrated absorption liquid. The remainder of the intermediate concentrated absorption liquid from the low temperature regenerator 4 is returned to the absorber 1 in the concentrated absorption liquid pipe by the bypass pipe 1
It is bypass-supplied via 9.

A part or all of the concentrated absorbing liquid from the high temperature regenerator 7 is transferred to the first additional heat exchanger 2 by the first absorbing liquid pump 13.
1 to the second additional heat exchanger 22, which will be described later.
Alternatively, it is supplied to the concentrator 30 after being heated by exchanging heat with the concentrated absorption liquid from the second additional heat exchanger 22 and the solution concentrator 30. The rest of the concentrated absorbing liquid from the high temperature regenerator 7 (which may be zero) joins the absorbing liquid pipe on the heating side from the first additional heat exchanger 21 via the bypass pipe 50. Concentrator 30
In the above, a part or all of the concentrated absorbing liquid that has been heated and concentrated by the refrigerant vapor from the once-through boiler 40 described later is fed to the second additional heat exchanger 22 by the second absorbing liquid pump 14, where the once-through boiler is used. After being heated by exchanging heat with the concentrated absorption liquid from 40, it is supplied to the once-through boiler 40.

In the once-through boiler 40, the concentrated absorption liquid heated and concentrated by the heat of combustion of the fuel is used as the second additional heat exchanger 22.
Is introduced into the heating side of the first additional heat exchanger 21 after heating the concentrated absorption liquid from the concentrator 30.
The rest of the concentrated absorbing liquid (may be zero) from the concentrator 30 joins the absorbing liquid pipe on the heating side from the second additional heat exchanger 22 via the bypass pipe 51. The refrigerant vapor from the once-through boiler 40 is introduced into the concentrator 30 via the refrigerant vapor pipe 18, where the absorbing liquid is heated and concentrated, and then the refrigerant drain is introduced into the high temperature regenerator 7. The refrigerant vapor from the concentrator 30 is sent to the high temperature regenerator 7 together with the refrigerant drain from the concentrator 30 through the refrigerant vapor pipe 17, where the absorption liquid is heated and concentrated.

The refrigerant vapor from the high temperature regenerator 7 is sent to the low temperature regenerator 4 through the refrigerant vapor pipe 16 together with the refrigerant drain from the high temperature regenerator 7, where the absorbing liquid is heated and concentrated. The refrigerant vapor from the low temperature regenerator 4 is introduced into the condenser through the refrigerant vapor pipe 15 together with the refrigerant drain from the low temperature regenerator 4.

FIG. 2 shows an absorption refrigerator according to the second embodiment of the present invention. In the present embodiment, exhaust gas heat exchangers (heat recovery units) 26, 27, 28 for exchanging heat with combustion exhaust gas discharged from the once-through boiler 40, auxiliary regenerators (exhaust gas heat exchanger) 29 are provided individually or simultaneously, By bypassing a part of the absorbing liquid supplied to the high temperature heat exchanger 6, the first additional heat exchanger 21, the second additional heat exchanger 22 or the high temperature regenerator 7 and exchanging heat with the exhaust gas, It is intended to save energy by recovering sensible heat.

The present embodiment will be described in detail. The absorption liquid pipe on the heated side of the high temperature heat exchanger 6 and the first additional heat exchanger 21.
Between the heated absorbent side of the second additional heat exchanger 22, the heated heated side absorbent liquid of the second additional heat exchanger 22, and the high temperature regenerator 7 between the inlet and outlet absorbent liquid pipes, respectively.
53, 54, 55 are connected, and exhaust gas heat exchangers 26, 27, 28, 29 into which the exhaust gas from the once-through boiler 40 is introduced are provided in these bypass pipes. That is, the exhaust gas heat exchangers 26, 27, and 28 are installed in parallel with the high-temperature heat exchanger 6, the first additional heat exchanger 21, and the second additional heat exchanger 22, respectively, and serve as heat recoverers. However, the exhaust gas heat exchanger 29 serves as an auxiliary regenerator. The exhaust gas heat exchangers 26, 27, 28, 29 are installed individually or in combination. Other configurations and operations are similar to those of the first embodiment.

FIG. 3 shows an absorption refrigerator according to the third embodiment of the present invention. In the present embodiment, the refrigerant heat recovery units 23, 24, 25 that exchange heat with the condensed refrigerant (refrigerant drain) discharged from the low temperature regenerator 4, the high temperature regenerator 7, and the condenser 30, respectively.
Are provided individually or simultaneously, and a part of the absorbing liquid supplied to the low-temperature heat exchanger 3, the high-temperature heat exchanger 6, and the first additional heat exchanger 21 is bypassed, and the heat is exchanged with the refrigerant drain. It is intended to save energy by recovering the drain heat.

Explaining this embodiment in detail, the heating liquid of the low temperature heat exchanger 3 on the heated side, the heating liquid of the high temperature heat exchanger 6 on the heating side, and the first additional heat exchanger 21 to be heated. The bypass pipes 56, 52, 53 to the absorption liquid pipes on the side, respectively.
Are connected to these bypass pipes, and refrigerant heat recovery units 23, 24, 25 into which the condensed refrigerant from the low temperature regenerator 4, the high temperature regenerator 7 or the condenser 30 are introduced are provided. That is, the refrigerant heat recovery units 23, 24, 25 are installed in parallel with the low temperature heat exchanger 3, the high temperature heat exchanger 6, and the first additional heat exchanger 21, respectively. Refrigerant heat recovery unit 23, 24, 2
5 are installed alone or in combination. Other configurations and operations are similar to those of the first and second embodiments.

FIG. 4 shows an absorption refrigerator according to the fourth embodiment of the present invention. In the present embodiment, the exhaust gas heat exchanger 26 is provided in parallel with the high temperature heat exchanger 6, and the refrigerant heat recovery device 23 is provided in parallel with the low temperature heat exchanger 3 to remove the combustion exhaust gas from the once-through boiler 40 and the refrigerant drain. It is designed to save energy by recovering the retained heat. Specifically, the bypass pipe 52 is connected to the absorption liquid pipe on the heated side of the high-temperature heat exchanger 6, and the exhaust gas heat exchanger 26 that recovers heat by exchanging heat with the combustion exhaust gas from the once-through boiler 40 is connected to the bypass pipe 52. Further, a bypass pipe 56 is connected to the absorption liquid pipe on the heated side of the low temperature heat exchanger 3, and a refrigerant heat recovery device 56 for exchanging heat with the condensed refrigerant from the low temperature regenerator 4 is provided in the bypass pipe 56. It is configured. Other configurations and operations are similar to those of the first embodiment.

FIG. 5 shows an absorption refrigerator according to a fifth embodiment of the present invention. In the present embodiment, the refrigerant heat recovery units 23, 24, 25 that exchange heat with the condensed refrigerant (refrigerant drain) discharged from the low temperature regenerator 4, the high temperature regenerator 7, and the condenser 30, respectively.
Are provided individually or simultaneously, and a part of the absorbing liquid supplied to the low temperature heat exchanger 3, the high temperature heat exchanger 6, and the first additional heat exchanger 21 is bypassed, and heat is exchanged with the refrigerant drain to obtain the absorbing liquid. The respective heat-exchanged refrigerant drains are merged in order and introduced into the lower-layer refrigerant heat recovery device, and the heat exchanged and merged refrigerant drains are introduced into the condenser 8 to effectively exchange heat of the condensed refrigerant. Energy is saved by recovering the heat.

Explaining this embodiment in detail, the heating liquid of the low temperature heat exchanger 3 on the heating side, the heating liquid of the high temperature heat exchanger 6 on the heating liquid side, and the heating of the first additional heat exchanger 21. The bypass pipes 56, 52, 53 to the absorption liquid pipes on the side, respectively.
Are connected to these bypass pipes, and refrigerant heat recovery units 23, 24, 25 into which the condensed refrigerant from the low temperature regenerator 4, the high temperature regenerator 7 or the condenser 30 are introduced are provided. That is, the refrigerant heat recovery units 23, 24, 25 are installed in parallel with the low temperature heat exchanger 3, the high temperature heat exchanger 6, and the first additional heat exchanger 21, respectively. Then, the condensing refrigerants that have exchanged heat with the absorbing liquid in the concentrator 30, the high temperature regenerator 7, and the low temperature regenerator 4 are sequentially merged and introduced into the lower refrigerant heat recovery device in the flow direction of the condensed refrigerant. The lowest-level refrigerant heat recovery unit 23 and the condenser 8 join so that the condensed refrigerant that is connected by the condensed refrigerant pipes 57, 58, and 59, and finally exchanges heat and joins is introduced into the condenser 8. They are connected by a condensed refrigerant pipe 60. Refrigerant heat recovery device 23,
24 and 25 are installed individually or in combination. Other configurations and operations are similar to those of the first and second embodiments.

FIG. 6 shows the essential parts of an absorption refrigerator according to the sixth embodiment of the present invention. In the present embodiment, the combination of the absorber 1 and the evaporator 9 is a plurality of sets, for example, two sets, that is, the absorber 1 and the evaporator 9 are composed of a set of the first absorber 1A and the first evaporator 9A. First block A and second absorber 1B
And a second block B composed of a second evaporator 9B. Cold water and cooling water are supplied from the second block B to the first block A in series, while the high-concentration absorption liquid is supplied to the first block A.
The block A is configured to be supplied to the second block B in series. Since the present embodiment is configured in this way, it is possible to change the pressure in the absorbing liquid 1 and the pressure in the evaporator 9 step by step for each block, so that the absorbing liquid can be used in a wide concentration range. Therefore, it is possible to obtain an effect that the usable range is expanded to a dilute concentration region, the amount of circulation of the absorbing solution is reduced, and the low temperature heat source is effectively used. Other configurations and operations are similar to those of the first to fifth embodiments.

FIG. 7 shows the essential parts of an absorption refrigerator according to the seventh embodiment of the present invention. In the present embodiment, the combination of the absorber 1 and the evaporator 9 is a plurality of sets, for example, two sets, that is, the absorber 1 and the evaporator 9 are composed of a set of the first absorber 1A and the first evaporator 9A. First block A and second absorber 1B
And a second block B composed of a second evaporator 9B. Cold water is supplied from the second block B to the first block A in series, and the high-concentration absorption liquid is supplied from the first block A to the second block. B is supplied in series to cooling water, and cooling water is supplied in parallel to the first block A and the second block B. Since the present embodiment is configured in this way, it is possible to change the pressure in the absorbing liquid 1 and the pressure in the evaporator 9 step by step for each block, so that the absorbing liquid can be used in a wide concentration range. Therefore, it is possible to obtain an effect that the usable range is expanded to a dilute concentration region, the amount of circulation of the absorbing solution is reduced, and the low temperature heat source is effectively used. Other configurations and operations are similar to those of the first to fifth embodiments.

FIG. 8 shows an absorption refrigerator according to an eighth embodiment of the present invention. Contrary to the usual case, the present embodiment is configured such that cooling water flows from the condenser 8 to the absorber 1 in series through the cooling water communication pipe 61. Since the present embodiment is configured in this way, the temperature of the condenser 8 can be reduced by passing cooling water of low temperature to the condenser 8 first.
Since the pressure decreases, the temperature and pressure of the low temperature regenerator 4 decrease, the temperature and pressure of the high temperature regenerator 7 decrease, and the temperature and pressure of the boiler system decrease. Therefore, the temperature and concentration of the absorbing liquid can be decreased. The effect of effective use of the low temperature heat source can be obtained. Other configurations and operations are similar to those of the first to seventh embodiments.

[0032]

Since the present invention is configured as described above, it has the following effects. (1) By combining and integrating a solution concentrator and a solution concentration boiler with a double-effect absorption refrigerator,
The solution concentrator can be used as the third regenerator and the solution condensing boiler as the fourth regenerator, and the effect of quadruple can be achieved, and the fuel consumption per cooling output can be reduced as a whole, and at the same time, energy saving and Resources can be saved, and at the same time, the entire absorption refrigerator can be made compact . ( 2 ) A bypass pipe for at least one of the heated liquid side of the low temperature heat exchanger, the heated liquid side of the high temperature heat exchanger and the heated liquid side of the first additional heat exchanger. And a refrigerant heat recovery device for exchanging heat with the condensed refrigerant from the low-temperature regenerator, high-temperature regenerator or solution concentrator in the bypass pipe, and the absorption liquid and heat in the solution concentrator, high-temperature regenerator and low-temperature regenerator. Condensed refrigerant pipes are connected so that the exchanged condensed refrigerants are merged in order and introduced into a lower refrigerant heat recovery unit in the flow direction of the condensed refrigerant, and finally the condensed refrigerant that has merged by heat exchange is the condenser. As described above, the lowest refrigerant heat recovery device and the condenser are connected by a confluent condensed refrigerant pipe, so that the heat of the condensed refrigerant (refrigerant drain) is effectively exchanged to recover the heat. Can save energy . ( 3 ) When the once-through boiler is used as the solution concentrating boiler, the absorption liquid cost can be reduced in addition to downsizing of the entire absorption refrigerator and simplification of handling.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an absorption refrigerator according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an absorption refrigerator according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an absorption refrigerator according to a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of an absorption refrigerator according to a fourth embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of an absorption refrigerator according to a fifth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a main part in an absorption refrigerator according to a sixth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a main part in an absorption refrigerator according to a seventh embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of an absorption refrigerator according to an eighth embodiment of the present invention.

FIG. 9 is a schematic configuration diagram showing an example of a conventional absorption refrigerator.

[Explanation of symbols]

1, 1A, 1B Absorber 2 Dilute liquid pump 3 Low temperature heat exchanger 4 Low temperature regenerator 5 Intermediate liquid pump 6 High temperature heat exchanger 7 High temperature regenerator 8 Condenser 9, 9A, 9B Evaporator 10 Refrigerant pump 13 First absorption Liquid (concentrated liquid) pump (first supply means) 14 Second absorption liquid (concentrated liquid) pump (second supply means) 15, 16, 17, 18 Refrigerant vapor pipes 19, 50, 51, 52, 53, 54, 55, 56 Bypass pipe 21 First additional heat exchanger 22 Second additional heat exchanger 23, 24, 25 Refrigerant heat recovery device 26, 27, 28 Exhaust gas heat exchanger (exhaust gas heat recovery device) 29 Exhaust gas heat exchanger (auxiliary Regenerator) 30 Solution concentrator 40 Through-flow boiler (solution concentration boiler) 57, 58, 59 Condensing refrigerant pipe 60 Combined condensing refrigerant pipe 61 Cooling water communication pipe

Continuation of front page (56) Reference JP-A-8-159594 (JP, A) JP-A-63-116066 (JP, A) JP-A-11-182966 (JP, A) JP-A-2-290474 (JP , A) JP 9-250837 (JP, A) JP 58-219371 (JP, A) JP 60-162166 (JP, A) JP 9-503285 (JP, A) JP 9-512332 (JP, A) Special Table 7-501611 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 15/00 102

Claims (5)

(57) [Claims] 1. A low temperature heat exchanger for absorbing liquid in order from the absorber,
Intermediate concentrated absorption that is configured to circulate to the absorber via the low temperature regenerator, high temperature heat exchanger, high temperature regenerator, high temperature heat exchanger, and low temperature heat exchanger, and is output from the low temperature regenerator to the high temperature regenerator. In a reverse cycle vapor absorption refrigerator equipped with a bypass pipe that bypasses a portion of the liquid to the concentrated absorbent pipe returning to the absorber, in the absorbing liquid pipe returning from the high temperature regenerator to the high temperature heat exchanger, from the high temperature regenerator First supply means for extracting at least a part of the absorption liquid of (1) and supplying it to a solution concentrator described later, and a solution concentrator for heating and concentrating the absorption liquid from the first supply means are connected in series to provide a first supply. First, heat exchange is performed between the means and the solution concentrator between the concentrated absorption liquid from the high temperature regenerator and the absorption liquid that has been heated and concentrated by the solution concentrating boiler described below and heat-exchanged by the second additional heat exchanger described below. Install an additional heat exchanger, and Second supply means for extracting at least a part of the absorption liquid returning from the solution concentrator to the first additional heat exchanger into the absorption liquid pipe returning to the first addition heat exchanger from the solution concentrator and supplying the solution concentration boiler described below,
A solution concentrating boiler for heating and concentrating the absorption liquid from the second supplying means is connected in series, and a concentrating solution from the solution concentrator and a heating concentrating solution from the solution concentrating boiler are connected between the second supplying means and the solution concentrating boiler. A second additional heat exchanger for exchanging heat with the absorbed absorption liquid is provided, and the solution concentration boiler and the second auxiliary unit are provided so that the absorption liquid heated and concentrated by the solution concentration boiler is returned to the heating side of the second additional heat exchanger. The heating exchanger is connected by an absorption liquid pipe, and on the other hand, so that the refrigerant vapor evaporated from the absorption liquid heated and concentrated in the solution concentrating boiler is supplied to the solution concentrating device as a heating source, the solution concentrating boiler and the solution concentrating device. Are connected by a refrigerant vapor pipe, the second additional heat exchanger is used to return the absorbing liquid heated and concentrated in the solution concentrating boiler and heat-exchanged in the second additional heat exchanger to the heating side of the first additional heat exchanger. And the first additional heat exchanger are absorption liquid piping On the other hand, it is an absorption refrigerating machine in which the solution concentrator and the high temperature regenerator are connected by refrigerant vapor piping so that the refrigerant vapor evaporated from the absorption liquid in the solution concentrator is supplied as a heating source of the high temperature regenerator. A bypass pipe to at least one of the heated liquid side of the low temperature heat exchanger, the heated liquid side of the high temperature heat exchanger and the heated liquid side of the first additional heat exchanger. Connected to the bypass pipe, a refrigerant heat recovery device for exchanging heat with the condensed refrigerant from the low-temperature regenerator, high-temperature regenerator or solution concentrator is provided, and heat exchange with the absorbing liquid is performed in the solution concentrator, high-temperature regenerator and low-temperature regenerator Each of the condensed refrigerant was connected in a condensing refrigerant pipe so as to be introduced into a lower refrigerant heat recovery device in the condensing refrigerant flow direction in order, and finally the condensed condensing refrigerant that has merged by heat exchange into the condenser. To be introduced Absorption refrigerating machine, characterized in that the lowest of the refrigerant heat recovery unit and the condenser is connected at the joining condensing refrigerant pipe. 2. A plurality of blocks in which an absorber and an evaporator are combined are provided, and each block is provided with a cold water pipe and a cooling water pipe so that the cold water, the cooling water and the absorbing liquid are supplied to the plurality of blocks in series. And claim connected by absorbing liquid piping
1. The absorption refrigerator according to 1 . 3. A plurality of blocks in which an absorber and an evaporator are combined are provided, and cold water and absorbing liquid are supplied in series to the plurality of blocks, and cooling water is supplied to the plurality of blocks in parallel. each block is chilled water piping, absorption liquid pipe and absorption refrigerating machine according to claim 1, wherein connected with the cooling water pipe. 4. The absorption refrigerator according to claim 1, 2 or 3 , wherein the condenser and the absorber are connected by a cooling water connecting pipe so that the cooling water is supplied from the condenser to the absorber. Absorption refrigerating machine according to claim 1 wherein the solution concentrated boiler is once-through boiler.