JPH0379626B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an absorption heat pump, and more specifically,
In addition to increasing the concentration of the concentrated absorption liquid heading from the regenerator to the absorber, the high temperature heat medium obtained in the heating absorber raises the temperature of the refrigerant vapor in the evaporator, increasing the heat recovery temperature in the absorber. Regarding absorption heat pumps. 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 line 2 is absorbed by the concentrated absorption liquid transferred from the regenerator 4 via the heat exchanger 5, generating latent heat of condensation. 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 8,
While cooling water is supplied to the cooling water coil 10,
The concentrated absorption liquid transferred by the pump 11 from the intermediate regenerator 12 via the concentrated absorption liquid pipe line 13 is sprayed by the spraying device 14. 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 transferred through the aforementioned concentrated absorption liquid conduit 13 to the heat exchanger 16 via the conduit 15. and flows into the liquid reservoir 12a of the intermediate regenerator 12. This dilute absorption liquid is supplied to the heat source coil 17 from the outside in the intermediate regenerator 12.
It is heated by the waste heat supplied through the refrigerant, and a part of it becomes refrigerant vapor and flows through the pipe 18 and is introduced into the condenser 19. This refrigerant vapor is cooled by cooling water supplied from the outside to the cooling water coil 20 to become a refrigerant liquid, and is transferred to the pipe line 2 by the pump 21.
2 to the liquid reservoir 1a of the evaporator 1.
The refrigerant liquid in the liquid reservoir 1a is spread by the spreading device 23, and the above-mentioned operation is repeated.

In such an absorption heat pump, 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 concentrated absorption liquid in the regenerator can be increased. As a result, the extraction temperature in the absorber can be increased. By the way, this extraction temperature can be increased by increasing the concentration of the concentrated absorption liquid from the regenerator introduced into the absorber, as well as by increasing the concentration of refrigerant vapor from the evaporator introduced into the absorber. This is also possible by increasing the temperature. Therefore,
If both are combined, the extraction temperature in the absorber can be further increased. Increasing the extraction temperature in such an absorber 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 has a condenser 1 as shown in FIG.
an evaporator 1 that evaporates the refrigerant liquid condensed in step 9; an absorber 3 that extracts latent heat of condensation generated when refrigerant vapor is absorbed by an absorption liquid circulated between the regenerator 4; An intermediate absorber 35 absorbs the evaporated refrigerant vapor with a concentrated absorption liquid introduced through the concentrated absorption liquid line 13, and an intermediate absorber 35 that delivers the concentrated absorption liquid to the concentrated absorption liquid line 13 and supplies the refrigerant vapor to the condenser 19. The absorption heat pump is equipped with an intermediate regenerator 39 for extracting heat at a temperature higher than the waste heat source temperature using a low-temperature heat source such as waste heat. Intermediate evaporator 26 that heats and evaporates the part with low-temperature heat such as waste heat
Then, the refrigerant vapor evaporated in the intermediate evaporator 26 is introduced, and the medium-concentration absorption liquid diluted in the intermediate absorber 35 is introduced through the medium-concentration absorption liquid pipe 34, and the refrigerant vapor is converted into the medium-concentration absorption liquid. For heating, a heating medium heated by high temperature heat generated by absorption is circulated and supplied to the evaporator 1, and a diluted absorption liquid is supplied to an intermediate regenerator 39 via a diluted absorption liquid pipe line 40. This is an absorption heat pump having an absorber 27.

The second invention has a condenser 1 as shown in FIG.
an evaporator 1 that evaporates the refrigerant liquid condensed in step 9; an absorber 3 that extracts latent heat of condensation generated when refrigerant vapor is absorbed by an absorption liquid circulated between the regenerator 4; An intermediate absorber 35 absorbs the evaporated refrigerant vapor with a concentrated absorption liquid introduced through the concentrated absorption liquid line 13, and an intermediate absorber 35 that delivers the concentrated absorption liquid to the concentrated absorption liquid line 13 and supplies the refrigerant vapor to the condenser 19. The absorption heat pump is equipped with an intermediate regenerator 39 for extracting heat at a temperature higher than the waste heat source temperature using a low-temperature heat source such as waste heat. Intermediate evaporator 26 that heats and evaporates the part with low-temperature heat such as waste heat
Then, the refrigerant vapor evaporated in the intermediate evaporator 26 is introduced, and the medium-concentration absorption liquid diluted in the intermediate absorber 35 is introduced through the medium-concentration absorption liquid pipe 34, and the refrigerant vapor is converted into the medium-concentration absorption liquid. A heating absorber that circulates and supplies a high-temperature heated heat medium generated by absorption to the evaporator 1, and supplies the diluted absorption liquid to the intermediate regenerator 39 via the diluted absorption liquid pipe line 40. 27, a heat exchanger 48 for performing heat exchange between the medium concentrated absorption liquid pipe line 34 and the dilute absorption liquid pipe line 40, and a heat exchanger 48 that performs heat exchange between the medium concentrated absorption liquid pipe line 34 and the concentrated absorption liquid pipe line 13. This is an absorption heat pump having a heat exchanger 49 for performing heat exchange.

〔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 a system diagram of an absorption heat pump 24 which is an embodiment of the present invention. This is the absorption heat pump 25 described in FIG. 1 with an intermediate evaporator 26 and a heating absorber 27 added thereto. The intermediate evaporator 26 in the figure is connected to a branch 2 from a branch point 22A of a refrigerant liquid pipe 22 heading from the condenser 19 to the evaporator 1.
8, with its tip protruding into the upper vicinity of the internal liquid reservoir 26a. Further, the intermediate evaporator 26 has a built-in dispersion device 30 for transferring the refrigerant liquid in the liquid reservoir 26a using a transfer pump 29 and dispersing the refrigerant liquid therein. Furthermore, a heat source coil 31 for heating the dispersed refrigerant liquid to generate refrigerant vapor is also provided inside. A refrigerant vapor pipe line 32 for introducing the refrigerant vapor into the heating absorber 27 is provided at the upper part of the intermediate evaporator 26, and the other end is connected to the upper part of the heating absorber 27. This heating absorber 27 includes a transfer pump 33.
A dispersing device 36 is built in to spray the medium-concentrated absorption liquid of the intermediate absorber 35 transferred via the medium-concentrated absorption liquid pipe line 34 therein. The sprayed medium-concentrated absorption liquid absorbs the introduced refrigerant vapor and generates latent heat of condensation. One end portion 37A of the circulating supply path 37 through which the heat medium that absorbs the generated latent heat of condensation circulates is installed inside the heating absorber 27, and the other end portion 37B is provided inside the evaporator 1. Note that a circulation pump 38 for circulating the heat medium is interposed in the circulation supply path 37. Furthermore, the liquid reservoir 27a of the heating absorber 27
A dilute absorption liquid pipe line 40 is provided for causing the dilute absorption liquid stored in the intermediate regenerator 39 to flow into the liquid reservoir 39a of the intermediate regenerator 39, and its tip is provided near the top of the liquid reservoir 39a. Further, a heat source coil 17 for heating the dilute absorption liquid in the liquid reservoir 39a and regenerating it into a concentrated absorption liquid is provided in the liquid reservoir 39a. A transfer pump 41 for transferring the regenerated concentrated absorption liquid to the aforementioned intermediate absorber 35 is interposed in the concentrated absorption liquid line 13. One end of this concentrated absorption liquid pipe line 13 is connected to the bottom of the intermediate regenerator 39, and its tip is connected to the dispersion device 14 built in the intermediate absorber 35.

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 other end 3 of the circulation supply path 37
The refrigerant liquid sprinkled on the high-temperature heat medium flowing through 7B is heated and becomes high-temperature refrigerant vapor. This refrigerant vapor is introduced into the absorber 3 from the pipe line 2, while the absorber 3
Inside, the concentrated absorption liquid transferred from the low-pressure regenerator 4 via the concentrated absorption liquid pipe line 45 by the pump 44 is sprayed by the dispersion device 46, the introduced refrigerant vapor is absorbed, and the latent heat of condensation is absorbed. Occur. 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 heat exchanger 5 heats the concentrated absorption liquid at a low temperature corresponding to the saturation temperature in the low-pressure regenerator 4. The liquid 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 transferred to the liquid reservoir 4.
It is heated via the heat source coil 7 by waste heat stored in the heat source a and supplied from the outside. A part of it is transferred to the intermediate absorber 3 as refrigerant vapor through a pipe 8.
5, 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 35 is absorbed by the concentrated absorption liquid transferred from the intermediate regenerator 39 via the concentrated absorption liquid pipe line 13 while being cooled on the surface of the cooling water coil 10 . As a result, the refrigerant vapor is absorbed into the concentrated absorption liquid at a low temperature, so that the absorption efficiency increases and the pressure in the intermediate absorber 35 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, intermediate absorber 3
The concentrated absorption liquid that has absorbed the refrigerant vapor in the refrigerant 5 becomes a medium-concentrated absorption liquid and accumulates in the liquid reservoir 35a. The intermediate absorption liquid in the liquid reservoir 35a is transferred by the transfer pump 33 via the intermediate concentration absorption liquid pipe line 34, and is transferred to one end 37 of the circulation supply path 37 by the spraying device 36 of the heating absorber 27.
It is scattered towards A. The sprayed medium-concentrated absorption liquid is transferred from an intermediate evaporator 26 to a refrigerant vapor pipe 3 to be described later.
The refrigerant vapor introduced through 2 is absorbed by the surface of one end portion 37A. The condensation latent heat generated at this time heats the heat medium in the circulation supply path 37. The heat medium heated to a high temperature is circulated within the circulation supply path 37 by the circulation pump 38. When this high temperature heat medium circulates and passes through the other end 37B in the evaporator 1,
The refrigerant liquid sprayed by the spraying device 43 is heated to become refrigerant vapor. As a result, the low-temperature heating medium circulates within the circulation supply path 37 and is heated at one end 37A by the latent heat of condensation in the same manner as described above, and becomes high again. By the way, the medium-concentration absorption liquid that has absorbed the refrigerant vapor in the heating absorber 27 becomes a dilute absorption liquid and flows into the liquid pool 2.
It accumulates in 7a. This diluted absorption liquid flows through the diluted absorption liquid pipe line 40 and flows into the liquid reservoir 39a of the intermediate regenerator 39. In the liquid reservoir 39a, the dilute absorption liquid is heated by waste heat supplied through the heat source coil 17, and part of the liquid becomes refrigerant vapor and is introduced into the condenser 19 through the pipe line 18, and the remainder becomes a concentrated absorption liquid. Liquid reservoir 39a
is stored in As described above, this concentrated absorption liquid is transferred to the intermediate absorber 35 to absorb refrigerant vapor. On the other hand, the refrigerant vapor introduced into the condenser 19 is cooled by the cold water supplied from the cooling water coil 20, becomes refrigerant liquid, and accumulates in the liquid reservoir 19a. This refrigerant liquid is transferred to the liquid reservoir 1a of the evaporator 1 by the pump 47 via the pipe line 22, and a part of it is diverted at the branch point 22A, and is sent from the branch line 28 to the liquid reservoir 26a of the intermediate evaporator 26. flows into. The refrigerant liquid that has flowed in is transferred by a transfer pump 29 and sprayed by a spraying device 30. At this time, the heat source coil 3
1 is supplied with waste heat, the refrigerant liquid is heated by this waste heat, becomes refrigerant vapor, and is introduced into the heating absorber 27 through the refrigerant vapor pipe line 32. Thereafter, as described above, the refrigerant vapor is absorbed by the medium-concentrated absorption liquid sprayed by the spraying device 36. Note that the remaining refrigerant liquid that was not separated at the branch point 22A of the pipe line 22 described above is directly transferred to the liquid reservoir 1 of the evaporator 1.
flows into a. Thereafter, the above-described operation is repeated.

In addition to the above-mentioned configuration, FIG. FIG. 4 is a schematic system diagram of a second invention in which a heat exchanger 49 for exchanging heat with the liquid pipe line 13 is provided. In addition, the same code|symbol is attached|subjected to the structure similar to the above-mentioned invention, and the description is abbreviate|omitted.

Even with such a configuration, it can be operated in the same manner as the above-described invention, and the heat exchanger 48
By interposing the medium-concentrated absorption liquid in the intermediate absorber 35, the transfer pump 33 transfers the medium-concentrated absorption liquid to the heating absorber 27.
While being transferred to the heating absorber 27, it is heated by the high temperature dilute absorption liquid. As a result, the medium-concentrated absorption liquid is brought to almost the saturation temperature of the heating absorber 27 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 37A of the circulation supply path 37. Ru. On the other hand, by interposing the heat exchanger 49, from the intermediate regenerator 39 to the intermediate absorber 35
The intermediate absorber 35 is
Since the medium-concentrated absorption liquid from the intermediate absorber 35 to the heating absorber 27 is heated, the temperature of the medium-concentrated absorption liquid in the intermediate absorber 35 is increased, and the generation of latent heat of condensation within the heating absorber 27 is increased. This is further encouraged. the result,
The amount of heat generated in the heating absorber 27 increases, the amount of heat absorbed by the heat medium circulating within the one end 37A of the circulation supply path 37 increases, and the temperature of the refrigerant vapor in the evaporator 1 increases.

〔Effect of the invention〕

As described in detail above, in the first aspect of the present invention, the heat source for evaporating the refrigerant liquid in the evaporator is supplied via a heat medium heated to a high temperature by the latent heat of condensation generated in the heating absorber. Therefore, the temperature of the refrigerant vapor in the evaporator, which is one of the elements for increasing the heat recovery temperature of the absorption heat pump, can be increased. Therefore, in addition to 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 at a higher heat efficiency.

[Brief explanation of drawings]

Figure 1 is a system diagram of a conventional absorption heat pump, Figure 2 is a system diagram of an absorption heat pump according to the first invention,
FIG. 3 is a system diagram of the absorption heat pump of the second invention. 1... Evaporator, 3... Absorber, 4... Regenerator,
13...Concentrated absorption liquid pipe line, 19...Condenser, 26...
...Intermediate evaporator, 27...Heating absorber, 34...
Middle concentrated absorption liquid pipe line, 35... Intermediate absorber, 39...
Intermediate regenerator, 40... Dilute absorption liquid pipe line, 48, 49
……Heat exchanger.

Claims (1)

[Claims] 1. An evaporator that evaporates refrigerant liquid condensed in a condenser, and 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 for absorbing refrigerant vapor evaporated in the regenerator by a concentrated absorption liquid introduced through a concentrated absorption liquid pipe; and an intermediate absorber for delivering the concentrated absorption liquid to the concentrated absorption liquid pipe and to the condenser. In an absorption heat pump that is equipped with an intermediate regenerator that derives refrigerant vapor and extracts heat at a temperature higher than the waste heat source temperature using a low temperature heat source such as waste heat, one of the refrigerant liquid condensed in the condenser is An intermediate evaporator that heats and evaporates the refrigerant with low-temperature heat such as waste heat, and the refrigerant vapor evaporated in this intermediate evaporator is introduced, and the medium-concentrated absorption liquid diluted in the intermediate absorber becomes a medium-concentration absorption liquid. A heating medium introduced through a pipe and heated by high temperature heat generated by absorption of refrigerant vapor into a medium-concentrated absorption liquid is circulated and supplied to the evaporator, and the diluted absorption liquid is absorbed. a heating absorber that is supplied to the intermediate regenerator via a liquid pipe line, and the refrigerant evaporation temperature of the evaporator is raised by the high temperature heat medium heated by the heating absorber. An absorption heat pump featuring 2. An evaporator that evaporates the refrigerant liquid condensed in the condenser, an absorber that extracts to the outside the latent heat of condensation generated when refrigerant vapor is absorbed by an absorption liquid circulated between the regenerator, and the evaporator that evaporates the refrigerant liquid in the regenerator. an intermediate absorber for absorbing refrigerant vapor by a concentrated absorption liquid introduced through a concentrated absorption liquid pipe; and an intermediate absorber for delivering the concentrated absorption liquid to the concentrated absorption liquid pipe and delivering refrigerant vapor to the condenser. In an absorption heat pump that is equipped with a 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. An intermediate evaporator that heats and evaporates with low-temperature heat, the refrigerant vapor evaporated in this intermediate evaporator is introduced, and a medium-concentrated absorption liquid diluted in the intermediate absorber is introduced via a medium-concentration absorption liquid pipe. A heating medium heated by high-temperature heat generated when the refrigerant vapor is absorbed into the medium-concentrated absorption liquid is circulated and supplied to the evaporator, and the diluted absorption liquid is passed through the diluted absorption liquid pipe line. a heating absorber for supplying to the intermediate regenerator; a heat exchanger for exchanging heat between the medium-concentrated absorption liquid pipe and the dilute absorption liquid pipe; and the medium-concentrated absorption liquid pipe and the concentrated absorption liquid. A heat exchanger for exchanging heat with the pipe, and the refrigerant evaporation temperature of the evaporator is raised by the high temperature heat medium heated by the heating absorber. absorption heat pump.