JPS60233473A - 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 pump 11 supplies the coolant vapor from the intermediate regenerator 12 via the concentrated absorption liquid pipe line 13. The transferred concentrated absorption liquid 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 heat source supplied to the regenerator 4 is relatively low (although it can sufficiently generate refrigerant vapor).

In addition, the concentrated absorption liquid that has absorbed refrigerant vapor in the intermediate absorber 9 is
The diluted absorbent liquid is transferred to the heat exchanger 1 through the diluted absorbent pipe line 15.
At 6, the concentrated absorption liquid is heated by the concentrated absorption liquid transferred through the concentrated absorption liquid pipe line 13, and flows into the liquid reservoir 12a of the intermediate regenerator 12. This dilute absorption liquid is heated in the intermediate regenerator 12 by waste heat supplied from the outside via the heat source coil 17,
A part of it becomes refrigerant vapor, passes through the pipe 18 and is introduced into the condenser 19. This refrigerant vapor is cooled by cooling water introduced into the cooling water coil 20 from the outside to become a refrigerant liquid, and is passed through a pipe 22 by a pump 21 to an evaporator l.
The liquid is transferred to the liquid reservoir 1a. 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. 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 absorb and provide a 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. an intermediate absorber 9 that absorbs refrigerant vapor evaporated in the regenerator 4 with a concentrated absorption liquid introduced via a concentrated absorption liquid pipe 40; The diluted absorption liquid diluted in step 9 is introduced through the diluted absorption liquid pipe line 41, and at the same time, the refrigerant vapor is led out to the condenser 19, and the concentrated absorption liquid is led out to the concentrated absorption liquid piped line 40. This is an absorption heat pump that uses a low-temperature heat source such as waste heat to extract heat at a temperature higher than the waste heat source temperature. The intermediate evaporator 26 is heated and evaporated with low-temperature heat, the refrigerant vapor evaporated in the intermediate evaporator 26 is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator 35 is passed through the concentrated absorption liquid pipe line 34. A heating medium heated by the high temperature heat generated by the absorption of the refrigerant vapor into the concentrated absorption liquid is circulated and supplied to the evaporator 1, and the medium concentrated absorption liquid is passed through the medium absorption liquid pipe 39. This is an absorption heat pump having a heating absorber 27 that supplies the intermediate regenerator 35.

The second invention, as shown in FIG. An absorber 3 that extracts the generated latent heat of condensation to the outside, an intermediate absorber 9 that absorbs refrigerant vapor evaporated in the regenerator 4 with a concentrated absorption liquid introduced via a concentrated absorption liquid pipe 40, and this intermediate absorber 9. An intermediate regenerator 35 in which the diluted absorption liquid is introduced through the diluted absorption liquid pipe 41, and at the same time, the refrigerant vapor is led to the condenser 19, and the concentrated absorption liquid is led to the concentrated absorption liquid pipe 40. This is an absorption heat pump that uses a low-temperature heat source such as waste heat to extract heat at a temperature higher than the waste heat source temperature. The refrigerant vapor evaporated in the intermediate evaporator 26 is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator 35 is introduced via the concentrated absorption liquid pipe line 34. A heating medium heated by high temperature heat generated when the refrigerant vapor is absorbed into the concentrated absorption liquid is circulated and supplied to the evaporator 1, and the intermediate concentration absorption liquid is passed through the intermediate absorption liquid pipe 39 to the intermediate absorption liquid. A heating absorber 27 that supplies the regenerator 35 and a concentrated absorption liquid pipe line 3 from the intermediate regenerator 35 to the heating absorber 27
A heat exchanger 48 that performs heat exchange between 4 and the intermediate absorption liquid pipe line 39, and between the concentrated absorption liquid line 40 and the dilute absorption liquid line 41 from the intermediate regenerator 35 to the intermediate absorber 9. 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 an absorption heat pump 24 which is an embodiment of the present invention.
The system diagram is shown below. 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 the condenser 1
Branch point 22 of the refrigerant liquid line 22 from 9 to the evaporator 1
A branch channel 28 is provided with the tip thereof protruding into the vicinity above the internal liquid reservoir 26a. Further, a transfer pump 29 is provided to transfer the refrigerant liquid in the liquid reservoir 26a to the intermediate evaporator 26.
A dispersing device 30 is built in for transporting and dispersing within the container. 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 is equipped with a dispersion device 36 for dispersing therein the concentrated absorption liquid from the intermediate regenerator 35, which has been transferred by the transfer pump 33 via the concentrated absorption liquid pipe line 34. The sprayed 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. Further, a middle tide absorption liquid pipe line 39 that causes the middle tide absorption liquid stored in the liquid reservoir 27a of the heating absorber 27 to flow into the liquid reservoir 35a of the intermediate regenerator 35
is provided, and its tip is provided near the top of the liquid reservoir 35a. Further, another concentrated absorbent liquid pipe 40 is provided from the branch point 34A of the concentrated absorbent liquid pipe 34 described above, and its tip is connected to the dispersion device 14 built in the intermediate absorber 9. A dilute absorption liquid pipe 41 for allowing the dilute absorption liquid stored in the liquid reservoir 9a of the intermediate absorber 9 to flow to the liquid reservoir 35a of the intermediate regenerator 35 is connected to the bottom of the intermediate absorber 9,
The other end is connected to the branch point 39A of the above-mentioned middle tide absorption liquid pipe line 39.

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 37B of the circulation supply path 37 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 via the concentrated absorption liquid pipe 45 by the pump 44 is sprayed. The refrigerant vapor that has been spread and introduced into the device 46 is absorbed, and latent heat of condensation is generated. Condensation latent heat is generated by hot water coil 6
It is absorbed by the hot water inside, 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 by the regenerator 4 to near the saturation temperature of the high-pressure absorber 3, 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 it is introduced into the intermediate absorber 9 via a pipe 8 as refrigerant vapor, and the remaining part becomes concentrated as a refrigerant vapor and becomes a concentrated absorption liquid in a liquid reservoir 4.
It accumulates in a. The refrigerant vapor introduced into the intermediate absorber 9 passes through the intermediate regenerator 35 while being cooled on the surface of the cooling water coil 10.
From concentrated absorption liquid pipe 34, branch point 34A, concentrated absorption liquid pipe 4
It is absorbed by the concentrated absorption liquid that is transported through the 0.

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 9 decreases, and the pressure in the regenerator 4 also decreases through the pipe 8. Regenerator 4
Since the internal pressure 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 concentrated absorption liquid that has absorbed the refrigerant vapor in the intermediate absorber 9 becomes a dilute absorption liquid and accumulates in the liquid reservoir 9a. The diluted absorption liquid in the liquid reservoir 9a joins the medium-tide absorption liquid from the heating absorber 27, which will be described later, via the diluted-absorption liquid pipe line 41 at a branch point 39A of the medium-concentrated absorption liquid pipe line 39, resulting in low-pressure intermediate regeneration. Liquid reservoir 35 in container 35
flows into a. In the liquid reservoir 35a, the absorption liquid is heated by waste heat supplied through the heat source coil 17, and a part of the liquid becomes refrigerant vapor and is introduced into the condenser 19 through the pipe line 18.
The remainder becomes a concentrated absorption liquid and is stored in the liquid reservoir 35a. The refrigerant vapor introduced into the condenser 19 is transferred to the cooling water coil 20
It is cooled by the cold water supplied from
It accumulates in 9a. The refrigerant liquid is transferred by the pump 47 to the liquid reservoir 1a of the evaporator 1 via the pipe line 22, and a part of it is diverted at the branch point 22A, and is transferred from the branch line 28 to the intermediate evaporator 2.
The liquid flows into the liquid reservoir 26a of No.6. The refrigerant liquid that has flowed in is transferred by a transfer pump 29 and sprayed by a spraying device 30.

At this time, waste heat is supplied to the heat source coil 31, so 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. Inside the heating absorber 27, the concentrated absorption liquid from the intermediate regenerator 35 described above is transferred by the transfer pump 33 and sprayed by the spraying device 36 toward one end 37'A of the circulation supply path 37. As a result, the concentrated absorption liquid absorbs the introduced refrigerant vapor at one end 37A.
, and generates latent heat of condensation to heat 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 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 37 and is heated at the other end 37B 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 27 becomes a high-temperature medium-method absorption liquid that falls into the liquid reservoir 27a and accumulates therein. The accumulated Nakaho absorption liquid is
As described above, the diluted absorbent liquid flows through the middle tide absorption liquid pipe line 39, joins with the diluted absorption liquid from the intermediate absorber 9, and flows into the liquid reservoir 35a of the intermediate regenerator 35. In addition, the above-mentioned pipe line 2
The remaining refrigerant liquid that was not separated at the branch point 22A of No. 2 flows directly into the liquid reservoir la of the evaporator 1.

Thereafter, the above-described operation is repeated.

In addition to the above-mentioned configuration, FIG.
9, and between the concentrated absorption liquid pipe line 40 and the dilute absorption liquid line 41 from the intermediate regenerator 35 to the intermediate absorber 9. exchanger 49
It is a schematic system diagram of the 2nd invention provided with this. In addition,
Components similar to those of the invention described above are designated by the same reference numerals, and their explanations will be 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 48, the concentrated absorption liquid of the intermediate regenerator 35 can be transferred to the transfer pump 33.
During the transfer to the heating absorber 27, it is heated by the high temperature intermediate method absorption liquid in the heating absorber 27. As a result, the 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. . On the other hand, by interposing the heat exchanger 49, the concentrated absorption liquid flowing from the intermediate regenerator 35 to the intermediate absorber 9 heats the dilute absorption liquid flowing from the intermediate absorber 9 to the intermediate regenerator 35. The low temperature dilute absorption liquid is raised in temperature and encouraged to become refrigerant vapor in the intermediate regenerator 35. As a result, the concentration of the concentrated absorption liquid in the intermediate regenerator 35 increases, so the amount of heat generated in the heating absorber 27 increases, and the amount of heat absorbed by the heat medium circulating in the one end 37A of the circulation supply path 37 increases. , the temperature of the refrigerant vapor in the evaporator l 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 supplied via a heating medium heated to high temperature by the latent heat of condensation generated in the heating absorber, 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, 9-intermediate absorber, 19-condenser, 24-absorption heat pump, 26-intermediate evaporator, 27-heating absorber, 34.40-concentrator Absorption liquid pipe line, 35-intermediate regenerator, 39-medium temperature absorption liquid line, 41
- Dilute absorption liquid pipe line, 47.48 - Heat exchanger patent applicant Kawasaki Heavy Industries, Ltd. agent Patent attorney Katsutoshi Yoshimura (and one other person) Figure 1 25 Figure 2 7i Figure 3

Claims (2)

[Claims] (1) an evaporator that evaporates the refrigerant liquid condensed in the condenser;
An absorber that extracts the 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 concentrated absorption liquid, and the diluted absorption liquid that has become diluted in this intermediate absorber is introduced through the diluted absorption liquid pipe, and the refrigerant vapor is led to the condenser to form the concentrated absorption liquid. In the absorption heat pump, which is equipped with an intermediate regenerator that leads to the concentrated absorption liquid pipe line, and extracts heat at a temperature higher than the waste heat source temperature using a low temperature heat source such as waste heat, An intermediate evaporator heats and evaporates a part of the refrigerant liquid using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in this intermediate evaporator is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator is A heating medium introduced through the absorption liquid pipe line and heated by high temperature heat generated by absorption of refrigerant vapor into the concentrated absorption liquid is circulated and supplied to the evaporator to convert the medium-tide absorption liquid into a medium-tide absorption liquid. a heating absorber that is supplied to the intermediate regenerator via a pipe, 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 the 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 concentrated absorption liquid, and the diluted absorption liquid that has become diluted in this intermediate absorber is introduced through the diluted absorption liquid pipe, and the refrigerant vapor is led to the condenser to form the concentrated absorption liquid. In the absorption heat pump, which is equipped with an intermediate regenerator that leads to the concentrated absorption liquid pipe line, and extracts heat at a temperature higher than the waste heat source temperature using a low temperature heat source such as waste heat, An intermediate evaporator heats and evaporates a part of the refrigerant liquid using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in this intermediate evaporator is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator is The refrigerant is introduced through the absorption liquid line.
Circulating and supplying a heating medium heated by high temperature heat generated when vapor is absorbed into a concentrated absorption liquid to the evaporator,
a heating absorber that supplies a medium-temperature absorption liquid to an intermediate regenerator via a medium-temperature absorption liquid pipe line; a concentrated absorption liquid line from the intermediate regenerator to the heating absorber; and a medium-temperature absorption liquid pipe line. a heat exchanger that performs heat exchange between the intermediate regenerator and the intermediate absorber, and a heat exchanger that performs heat exchange between the concentrated absorption liquid pipe line from the intermediate regenerator to the intermediate absorber and the dilute absorption liquid pipe line; An absorption heat pump characterized in that the refrigerant evaporation temperature of the evaporator is raised by a high-temperature heat medium heated by the heating absorber.