JPS60233472A - Absorption heat pump - 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 Application Field] The present invention relates to an absorption heat pump, and more specifically, the present invention relates to an absorption heat pump, in particular, it increases the concentration of a concentrated absorption liquid flowing from a regenerator to an absorber, and uses a high-temperature heat medium obtained in a heating absorber. The present invention relates to an absorption heat pump that increases the temperature of refrigerant vapor in an evaporator and increases the heat recovery temperature in an absorber. This is used in the field of absorption heat pumps that use a low-temperature heat source such as waste heat to extract heat at a temperature higher than the waste heat source temperature.

[Prior art]

There is a device as shown in FIG. 1 as a conventional absorption heat pump. To briefly describe its operation, refrigerant liquid is heated in the evaporator 1 by waste heat supplied from the outside and becomes refrigerant vapor. This refrigerant vapor introduced into the absorber 3 via the pipe line 2 is absorbed by the concentrated absorption liquid introduced from the regenerator 4 via the heat exchanger 5, at which time latent heat of condensation is generated. The hot water supplied to the hot water coil 6 is heated by this latent heat of condensation, and is taken out as high-temperature water or saturated steam for heat recovery. On the other hand, the dilute absorption liquid that has absorbed the refrigerant vapor heats the concentrated absorption liquid heading from the regenerator 4 to the absorber 3 in the heat exchanger 5, and then flows into the liquid reservoir 4a of the regenerator 4 where the pressure is low. In the regenerator 4, waste heat supplied from the outside to the heat source coil 7 heats the dilute absorption liquid to generate refrigerant vapor and regenerates the dilute absorption liquid into a concentrated absorption liquid. In the intermediate absorber 9 into which refrigerant vapor is introduced via the pipe line 8, cooling water is supplied to the cooling water coil 10, while the concentrated absorption liquid transferred from the intermediate regenerator 12 by the pump 11 is It is sprayed by the spraying device 13. As a result, the concentrated absorption liquid absorbs refrigerant vapor while being cooled on the surface of the cooling water coil 10, so that the internal pressure of the intermediate absorber 9 decreases. Since the intermediate absorber 9 is connected to the regenerator 4 through a pipe line 8, the pressure therein also decreases, and the saturation temperature with respect to that pressure also decreases. Therefore, the regenerator 4 can generate sufficient refrigerant vapor even if the supplied heat source is relatively low. Further, the concentrated absorption liquid that has absorbed the refrigerant vapor in the intermediate absorber 9 becomes a diluted absorption liquid and is directed to the intermediate absorber 9 via the diluted absorption liquid pipe line 14 through the heat exchanger 15 from the intermediate regenerator 12 described above. Heated by the concentrated absorption liquid, the intermediate regenerator 12
The liquid flows into the liquid reservoir 12a. This dilute absorption liquid is heated in the intermediate regenerator 12 by waste heat supplied from the outside via the heat source coil 16, and a part of it becomes refrigerant vapor and flows through the pipe 17 to the condenser 18. be introduced. This refrigerant vapor is cooled by cooling water introduced into the cooling water coil 19 from the outside, becomes a refrigerant liquid, and is transferred to the liquid reservoir 1a of the evaporator 1 via a pipe line 21 by a pump 20. The refrigerant liquid in the liquid reservoir 1a is spread by the spreading device 22, and the above-described operation is repeated.

With an absorption heat pump like Kono, the pressure in the regenerator can be lowered, so the generation of refrigerant vapor can be promoted with a low heat source, and as a result, the concentration of the concentrated absorption liquid in the regenerator can be increased. This makes it possible to increase the extraction temperature in the absorber. By the way, this extraction temperature can be increased by increasing the concentration of the concentrated absorption liquid from the regenerator that is introduced into the absorber, as well as by increasing the temperature of the refrigerant vapor from the evaporator that is introduced into the absorber. This is also possible by increasing it. Therefore, if both are combined, the extraction temperature in the absorber can be further increased. Increasing the extraction temperature in the absorber in this way can greatly expand the uses of heat, so in addition to increasing the concentration of the concentrated absorption liquid as in the example above, it is also possible to increase the temperature of the refrigerant vapor. requested.

[Purpose of the invention]

The present invention has been made in response to the above-mentioned needs, and it is possible to increase the temperature of refrigerant vapor in an evaporator, and to achieve this by applying an effective heat cycle to the heat source used to increase the temperature. The purpose is to provide an absorption heat pump.

[Structure of the invention]

The features of the present invention will be explained with reference to the drawings.

The first invention, as shown in FIG. The absorber 3 extracts the generated latent heat of condensation to the outside, the intermediate absorber 38 absorbs the refrigerant vapor evaporated in the regenerator 4, and the diluted absorbent liquid in the intermediate absorber 38 flows through the dilute absorbent pipe line 41. It is an absorption heat pump that is equipped with an intermediate regenerator 34 that introduces refrigerant vapor into the condenser 18 through the refrigerant, and extracts heat at a temperature higher than the waste heat source temperature using a low temperature heat source such as waste heat. There is an intermediate evaporator 25 that heats and evaporates a part of the refrigerant liquid condensed in the condenser 18 using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in this intermediate evaporator 25 is introduced and performs intermediate regeneration. The concentrated absorption liquid concentrated in the vessel 34 is introduced through the concentrated absorption liquid line 33, and the heat medium heated with high temperature heat generated by the absorption of refrigerant vapor into the concentrated absorption liquid is transferred to the evaporator 1. This is an absorption heat pump having a heating absorber 26 that circulates and supplies the medium-process absorption liquid to the intermediate absorber 38 via the medium-process absorption liquid pipe line 39.

The second invention, as shown in FIG. The absorber 3 extracts the generated latent heat of condensation to the outside, the intermediate absorber 38 absorbs the refrigerant vapor evaporated in the regenerator 4, and the diluted absorbent liquid in the intermediate absorber 38 flows through the dilute absorbent pipe line 41. It is an absorption heat pump that is equipped with an intermediate regenerator 34 that introduces refrigerant vapor into the condenser 18 through the refrigerant, and extracts heat at a temperature higher than the waste heat source temperature using a low temperature heat source such as waste heat. There is an intermediate evaporator 25 that heats and evaporates a part of the refrigerant liquid condensed in the condenser 18 using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in this intermediate evaporator 25 is introduced and performs intermediate regeneration. The concentrated absorption liquid concentrated in the vessel 34 is introduced through the concentrated absorption liquid line 33, and the heat medium heated with high temperature heat generated by the absorption of refrigerant vapor into the concentrated absorption liquid is transferred to the evaporator 1. a heating absorber 26 that circulates and supplies medium-process absorption liquid to the intermediate absorber 38 via a medium-process absorption liquid pipe line 39; The absorption heat pump has a heat exchanger 47 that exchanges heat between the diluted absorption liquid pipe 41 and the medium absorption liquid pipe 39. .

〔Example〕

EMBODIMENT OF THE INVENTION Below, the absorption heat pump of this invention is demonstrated in detail based on the drawing which shows the Example.

FIG. 2 shows an absorption heat pump 23 which is an embodiment of the present invention.
The system diagram is shown below. This is the absorption heat pump 24 described in FIG. 1 with an intermediate evaporator 25 and a heating absorber 26 added thereto. The intermediate evaporator 25 in the figure is the condenser 1
A branch line 27 is connected from a branch point 21A in a refrigerant liquid pipe line 21 heading from 8 to an evaporator 1, and the tip of the branch line 27 is connected to an internal liquid reservoir 25.
It has a state of protruding into the upper vicinity of a. Further, this intermediate evaporator 25 has a built-in dispersion device 29 for transferring the refrigerant liquid in the liquid reservoir 25a using a transfer pump 28 and dispersing the refrigerant liquid therein. Further, a heat source coil 30 for heating the sprayed refrigerant liquid to generate refrigerant vapor is also provided inside.

A refrigerant vapor pipe line 31 for introducing the refrigerant vapor into the heating absorber 26 is provided at the upper part of the intermediate evaporator 25, and the other end is connected to the upper part of the heating absorber 26. This heating absorber 26 is connected to a concentrated absorption liquid pipe 3 by a transfer pump 32.
A dispersion device 35 is provided for dispersing the concentrated absorption liquid from the intermediate regenerator 34 transferred through the intermediate regenerator 3 therein.

The sprayed concentrated absorption liquid absorbs the introduced refrigerant vapor and generates latent heat of condensation. One end 36A of the circulation supply path 36 through which the heat medium that absorbs the generated latent heat of condensation circulates is installed inside the heating absorber 26, and the other end 36B is provided inside the evaporator 1. In addition,
This circulation supply path 36 has a circulation pump 3 that circulates the heat medium.
7 is interposed.

Further, a medium-temperature absorption liquid pipe line 39 is provided for transferring the medium-temperature absorption liquid stored in the liquid reservoir 26a of the heating absorber 26 to the intermediate absorber 38, and the tip thereof is connected to the dispersion device 40 of the intermediate absorber 38. ing. In addition, 41 is a diluted absorption liquid pipe line, which is provided to cause the diluted absorption liquid in the liquid reservoir 38a of the intermediate absorber 38 to flow into the liquid reservoir 34a of the intermediate regenerator 34. By the way, since the internal pressure of the intermediate absorber 38 is slightly lower than the internal pressure of the aforementioned intermediate regenerator 34, a pump (not shown) is provided in the diluted absorption liquid pipe line 41.
8 is provided at a higher position than the intermediate regenerator 34 to create a liquid reservoir 38.
The diluted absorption liquid a may be allowed to flow down to the intermediate regenerator 34 by gravity.

According to such a configuration, it can be operated as follows.

First, the refrigerant liquid stored in the liquid reservoir 1a of the evaporator 1 is transferred to the spraying device 43 by the pump 42 and is sprayed. At this time, the refrigerant liquid spread over the high temperature heat medium flowing through the other end 36B of the circulation supply path 36 is heated and becomes high temperature refrigerant vapor. This refrigerant vapor is introduced into the absorber 3 through the pipe 2, while in the absorber 3, the concentrated absorption liquid transferred from the low-pressure regenerator 4 by the pump 44 is sprayed from the spraying device 45 and introduced. Refrigerant vapor is absorbed and latent heat of condensation is generated. The latent heat of condensation is absorbed by the hot water in the hot water coil 6, and the hot water becomes high temperature and is extracted as high temperature water or saturated steam. The concentrated absorption liquid that has absorbed the refrigerant vapor becomes a dilute absorption liquid, and while flowing into the low-pressure regenerator 4, the concentrated absorption liquid is heated at a low temperature corresponding to the saturation temperature in the aforementioned low-pressure regenerator 4 in the heat exchanger 5. , flows into the liquid reservoir 4a of the regenerator 4. The concentrated absorption liquid heated in the heat exchanger 5 is heated to near the saturation temperature of the absorber 3, which has a higher pressure than the regenerator 4, and is dispersed within the absorber 3 to absorb refrigerant vapor as described above. As a result, the generated latent heat of condensation increases the temperature of the supplied hot water, which is hardly used to raise the temperature of the concentrated absorption liquid, since the temperature of the concentrated absorption liquid has reached near the saturation temperature of the absorber 3. used for. By the way, the dilute absorption liquid that has flowed into the regenerator 4 is stored in the liquid reservoir 4a and is heated via the heat source coil 7 by waste heat supplied from the outside. A part of the refrigerant vapor is introduced into the intermediate absorber 38 via the pipe line 8, and the remaining part becomes concentrated as a refrigerant vapor and accumulates in the liquid reservoir 4a as a concentrated absorption liquid. The refrigerant vapor introduced into the intermediate absorber 38 is transferred to the cooling water coil 1
While being cooled on the surface of 0, it is absorbed by a medium-temperature absorption liquid from a heating absorber 26, which will be described later. As a result, the low-temperature refrigerant vapor is absorbed into the medium-temperature absorption liquid, so the absorption efficiency increases and the pressure in the intermediate absorber 38 decreases, and the pressure in the regenerator 4 also decreases through the pipe 8. Since the pressure inside the regenerator 4 becomes low, the saturation temperature decreases, and the generation of refrigerant vapor is promoted with a relatively low supply heat source. As a result, the concentration of the concentrated absorption liquid stored in the liquid reservoir 4a increases. By the way, the medium-temperature absorption liquid that has absorbed the refrigerant vapor in the intermediate absorber 38 becomes a diluted absorption liquid and accumulates in the liquid reservoir 38a. The diluted absorption liquid in the liquid reservoir 38a is transferred to the diluted absorption liquid pipe line 41 to the liquid reservoir 34a of the low-pressure intermediate regenerator 34.
flows through. This dilute absorption liquid is heated by waste heat supplied from the outside through the heat source coil 16, and a part of it becomes refrigerant vapor and is introduced into the condenser 18 through the pipe line 17.
The remainder becomes a concentrated absorption liquid and is stored in a liquid reservoir 34a.

The refrigerant vapor introduced into the condenser 18 is transferred to the cooling water coil 1
It is cooled by the cooling water supplied from 9, becomes a refrigerant liquid, and accumulates in a liquid reservoir 18a. The refrigerant liquid is transferred to the liquid reservoir 1a of the evaporator 1 by the pump 46 via the pipe line 21, and a part of it is diverted at the branch point 21A, and is transferred from the branch line 27 to the liquid reservoir 25a of the intermediate evaporator 25. Flow into. The flowing refrigerant liquid is transferred by a transfer pump 28 and sprayed by a spraying device 29. At this time, waste heat is supplied to the heat source coil 30, so the refrigerant liquid is heated by this waste heat, becomes refrigerant vapor, and is introduced into the heating absorber 2G through the refrigerant vapor pipe line 31. Inside the heating absorber 26, the concentrated absorption liquid from the intermediate regenerator 34 is transferred by a transfer pump 32 to the spraying device 3.
5 toward one end 36A of the circulation supply path 3G. As a result, the concentrated absorption liquid absorbs the introduced refrigerant vapor on the surface of the one end portion 36A, generates latent heat of condensation, and
i! The heating medium in 836 is heated. The heat medium heated to a high temperature is circulated within the circulation supply path 36 by the circulation pump 37 . When this high-temperature heat medium circulates and passes through the other end 36B in the evaporator 1, the refrigerant liquid sprayed from the sprayer 43 is heated and turned into refrigerant vapor. As a result, the heat medium that has become low temperature circulates within the circulation supply path 36 and is heated at the other end 36B by the latent heat of condensation in the same manner as described above, and becomes high temperature again.

By the way, the concentrated absorption liquid that has absorbed the refrigerant vapor in the heating absorber 26 becomes a high-temperature, intermediate-temperature absorption liquid that falls and accumulates in the liquid reservoir 26a. This medium-temperature absorption liquid flows through the medium-temperature absorption liquid pipe line 39 and is sprayed to the spraying device 40 of the intermediate absorber 38. As described above, the medium-temperature absorption liquid absorbs the refrigerant vapor introduced at this time. Note that the remaining refrigerant liquid that was not separated at the branch point 21A of the pipe line 21 described above flows directly into the liquid reservoir 1a of the evaporator 1. Thereafter, the above-described operation is repeated.

In addition to the above-mentioned configuration, FIG.
7 and a heat exchanger 48 for exchanging heat between the dilute absorption liquid pipe line 41 and the medium-method absorption liquid line 397. FIG. In addition, the same code|symbol is attached|subjected to the structure similar to the above-mentioned invention, and the description is abbreviate|omitted.

With such a configuration, it is possible to operate in the same manner as in the above-described invention, and by interposing the heat exchanger 47, the concentrated absorption liquid of the intermediate regenerator 34 is transferred to the heating absorber 26 via the transfer pump 32. During the transfer, it is heated by the high temperature intermediate temperature absorption liquid in the heating absorber 26. As a result, the concentrated absorption liquid is brought to almost the saturation temperature of the heating absorber 26 and is dispersed therein, and almost all of the latent heat of condensation generated at this time is absorbed by the heating medium at one end 36A of the circulation supply path 36. . On the other hand, by interposing the heat exchanger 48, the diluted absorption liquid flowing from the intermediate absorber 38 to the intermediate regenerator 34 is heated by the medium temperature absorption liquid flowing from the heating absorber 26 to the intermediate absorber 38.

As a result, the temperature of the low-temperature dilute absorption liquid in the intermediate absorber 38 is increased, and it is encouraged to become refrigerant vapor in the intermediate regenerator 34, and the concentration of the concentrated absorption liquid in the intermediate regenerator 34 is increased. The amount of heat generated in the heating absorber 26 increases, the amount of heat absorbed by the heat medium circulating in the one end 36A of the circulation supply path 36 increases, and the temperature of the refrigerant vapor in the evaporator 1 increases.

〔Effect of the invention〕

As described in detail above, the first invention includes:
The heat source for evaporating the refrigerant liquid in the evaporator is heated to a high temperature by the latent heat of condensation generated in the heating absorber, and is supplied via a heating medium, which is one of the elements that increases the heat recovery temperature of the absorption heat pump. The temperature of the refrigerant vapor in an evaporator can be increased. Therefore, in combination with increasing the concentration of the concentrated absorption liquid in the regenerator, the heat recovery temperature can be increased. In the second invention, since a heat exchanger is interposed, the above-mentioned effects can be exhibited with higher thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional absorption heat pump, FIG. 2 is a system diagram of an absorption heat pump according to the first invention, and FIG. 3 is a system diagram of an absorption heat pump according to the second invention. 1-evaporator, 3-absorber, 4-regenerator, 18-condenser,
23-absorption heat pump, 25-intermediate evaporator, 26-heating absorber, 33-concentrated absorption liquid pipe, 34-intermediate regenerator,
38-Intermediate absorber, 39-Medium tide absorption liquid pipe, 41-Dilute absorption liquid pipe, 47.48-Heat exchanger Patent applicant Kawasaki Heavy Industries, Ltd. agent Patent attorney Katsutoshi Yoshimura (1 person) No. 1 Figure 2

Claims (2)

[Claims] (1) an evaporator that evaporates the refrigerant liquid condensed in the condenser;
an absorber that extracts latent heat of condensation generated when refrigerant vapor is absorbed by an absorption liquid circulated between the regenerator and the regenerator;
An intermediate absorber absorbs the refrigerant vapor evaporated in the regenerator, and a diluted absorption liquid that has become diluted in the intermediate absorber is introduced through a diluted absorption liquid pipe line, and the refrigerant vapor is led out to the condenser. In an absorption heat pump that is equipped with an intermediate regenerator and extracts heat at a temperature higher than the waste heat source temperature using a low-temperature heat source such as waste heat, a part of the refrigerant liquid condensed in the condenser is converted into waste heat, etc. The refrigerant vapor evaporated in the intermediate evaporator is introduced into the intermediate evaporator, and the concentrated absorption liquid concentrated in the intermediate regenerator is introduced through the concentrated absorption liquid pipe. 9. Circulating and supplying a heating medium heated with high temperature heat generated by absorption of refrigerant vapor into a concentrated absorption liquid to the evaporator;
a heating absorber for supplying the concentrated absorption liquid to the intermediate absorber through nine concentrated absorption liquid pipes; An absorption heat pump characterized by increasing the evaporation temperature. (2) an evaporator that evaporates the refrigerant liquid condensed in the condenser;
an absorber that extracts to the outside latent heat of condensation generated when refrigerant vapor is absorbed by an absorption liquid circulated between the regenerator and an intermediate absorber that absorbs refrigerant vapor evaporated in the regenerator;
The intermediate absorber is equipped with an intermediate regenerator that introduces the diluted absorption liquid diluted in the intermediate absorber through the diluted absorption liquid pipe line, and also delivers refrigerant vapor to the condenser, and uses a low-temperature heat source such as waste heat. In an absorption heat pump that extracts heat at a temperature higher than the temperature of the waste heat source using The refrigerant vapor evaporated in the intermediate evaporator is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator is introduced through the concentrated absorption liquid pipe. circulating and supplying a heat medium heated with high temperature heat to the evaporator;
a heating absorber for supplying concentrated absorption liquid to an intermediate absorber via a concentrated absorption liquid line 9; and a heat exchanger for performing heat exchange between the concentrated absorption liquid line and the concentrated absorption liquid line 9. a heat exchanger for performing heat exchange between the dilute absorption liquid pipe line and the concentrated absorption liquid pipe line; An absorption heat pump characterized by increasing the refrigerant evaporation temperature of the evaporator.