JPH0441269B2 - - 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 the 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 8,
While cooling water is supplied to the cooling water coil 10,
The concentrated absorption liquid transferred from the intermediate regenerator 12 by the pump 11 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.
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. In addition, the concentrated absorption liquid that has absorbed the refrigerant vapor in the intermediate absorber 9 becomes a diluted absorption liquid and passes through the diluted absorption liquid pipe line 14 to the heat exchanger 1.
5, the concentrated absorption liquid flowing from the intermediate regenerator 12 to the intermediate absorber 9 is heated by the concentrated absorption liquid, and 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 to become a refrigerant liquid, and is transferred to the liquid reservoir 1a of the evaporator 1 via a pipe 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.

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 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.

As shown in FIG. 2, the invention shown in FIG. 1 includes an evaporator 1 that evaporates refrigerant liquid condensed in a condenser 18;
An absorber 3 that takes out the latent heat of condensation generated when refrigerant vapor is absorbed by the absorption liquid circulated between the regenerator 4 and the regenerator 4; an intermediate absorber 38 that absorbs the refrigerant vapor evaporated in the regenerator 4; The diluted absorption liquid that has become diluted in the intermediate absorber 38 is introduced through the diluted absorption liquid pipe line 41, and is equipped with an intermediate regenerator 34 that leads out refrigerant vapor to the condenser 18, and is equipped with an intermediate regenerator 34 for discharging refrigerant vapor to the condenser 18. An absorption heat pump that uses a heat source to extract heat at a temperature higher than the waste heat source temperature, and is an intermediate evaporation that heats and evaporates a part of the refrigerant liquid condensed in the condenser 18 with low-temperature heat such as waste heat. The refrigerant vapor evaporated in the intermediate evaporator 25 is introduced into the intermediate regenerator 25, and the concentrated absorption liquid condensed in the intermediate regenerator 34 is introduced through the concentrated absorption liquid pipe 33, and the refrigerant vapor is absorbed into the concentrated absorption liquid. circulating and supplying a heat medium heated by high temperature heat generated by the evaporator 1;
This is an absorption heat pump having a heating absorber 26 that supplies a medium-concentration absorption liquid to an intermediate absorber 38 via a medium-concentration absorption liquid pipe line 39.

The second invention has a condenser 1 as shown in FIG.
an evaporator 1 that evaporates the refrigerant liquid condensed in step 8; An intermediate absorber 38 that absorbs evaporated refrigerant vapor, and an intermediate absorber 38 that introduces the diluted absorption liquid that has become diluted in the intermediate absorber 38 via the dilute absorption liquid pipe 41 and leads the refrigerant vapor to the condenser 18. The absorption heat pump is equipped with a regenerator 34 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 25 that heats and evaporates with low-temperature heat such as heat, and refrigerant vapor evaporated in this intermediate evaporator 25 are introduced,
The concentrated absorption liquid concentrated in the intermediate regenerator 34 is introduced through the concentrated absorption liquid line 33, and the heat medium is heated with high-temperature heat generated when the refrigerant vapor is absorbed into the concentrated absorption liquid. a heating absorber 26 that circulates and supplies the medium-concentrated absorption liquid to the evaporator 1 and supplies the medium-concentration absorption liquid to the intermediate absorber 38 via the medium-concentration absorption liquid pipe line 39; an absorption heat pump having a heat exchanger 47 for exchanging heat with the line 39, and a heat exchanger 48 for exchanging heat between the dilute absorption liquid line 41 and the medium-concentrated absorption liquid line 39; That's what I did.

〔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 23 which is an embodiment of the present invention. 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 has a branch line 27 extending from a branch point 21A in a refrigerant liquid pipe line 21 from the condenser 18 to the evaporator 1, with its tip protruding into the upper vicinity of an internal liquid reservoir 25a. have. 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 therein.
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 equipped with a spraying device 35 that sprays the concentrated absorption liquid from the intermediate regenerator 34 transferred by the transfer pump 32 via the concentrated absorption liquid pipe line 33 within the heating absorber 26 . 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. Note that a circulation pump 37 for circulating the heat medium is interposed in the circulation supply path 36. Furthermore, the liquid reservoir 26a of the heating absorber 26
A medium-concentration absorption liquid pipe line 39 is provided for transferring the medium-concentration absorption liquid stored in the intermediate absorber 38 to the intermediate absorber 38, and its tip is connected to the dispersion device 40 of the intermediate absorber 38. In addition, 41 is a dilute absorption liquid pipe line, which is connected to the intermediate absorber 3.
The diluted absorption liquid in the liquid reservoir 38a of No. 8 is provided to flow into the liquid reservoir 34a of the intermediate regenerator 34. By the way, the internal pressure of the intermediate absorber 38 is slightly lower than the internal pressure of the intermediate regenerator 34 described above, so either a pump (not shown) is provided in the diluted absorption liquid pipe line 41, or the intermediate absorber 38 is connected to the intermediate regenerator 34. It is also preferable that the dilute absorbent liquid in the liquid reservoir 38a is caused 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 thereon. At this time, the other end 3 of the circulation supply path 36
The refrigerant liquid sprinkled on the high-temperature heat medium flowing through 6B 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 by the pump 44 from the low-pressure regenerator 4 is sprayed from the spraying device 45, and the introduced refrigerant vapor is absorbed to generate latent heat of condensation. 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 it is transferred to the pipe 8 as refrigerant vapor.
The remaining liquid is introduced into the intermediate absorber 38 through the refrigerant vapor, and the concentration of the remaining liquid becomes higher by the amount of refrigerant vapor, and the liquid is collected in the liquid reservoir 4a as a concentrated absorption liquid. The refrigerant vapor introduced into the intermediate absorber 38 is cooled on the surface of the cooling water coil 10 and absorbed into the intermediate concentrated absorption liquid from the heating absorber 26, which will be described later. As a result, the refrigerant vapor is absorbed into the medium-concentrated absorption liquid at a low temperature, so that 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 line 8. Regenerator 4
As the pressure inside becomes low, the saturation temperature decreases,
A relatively low supply heat source facilitates the generation of refrigerant vapor. As a result, the concentration of the concentrated absorption liquid stored in the liquid reservoir 4a increases. By the way, the medium-concentrated absorption liquid that has absorbed the refrigerant vapor in the intermediate absorber 38 becomes a dilute absorption liquid and accumulates in the liquid reservoir 38a. The dilute absorption liquid in the liquid reservoir 38a flows into the liquid reservoir 34a of the low-pressure intermediate regenerator 34 via the dilute absorption liquid pipe line 41. This diluted 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 enters the pipe line 1.
7 into the condenser 18, and the remainder becomes a concentrated absorption liquid and is stored in a liquid reservoir 34a. The refrigerant vapor introduced into the condenser 18 is cooled by the cooling water supplied from the cooling water coil 19, becomes refrigerant liquid, and accumulates in the 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 the waste heat, becomes refrigerant vapor, and is introduced into the heating absorber 26 through the refrigerant vapor pipe line 31. Inside the heating absorber 26, the concentrated absorption liquid from the intermediate regenerator 34 described above is transferred by the transfer pump 32 and sprayed by the spraying device 35 toward one end 36A of the circulation supply path 36. 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 heats the heat medium in the circulation supply path 36. The heating medium that has been heated to a high temperature is
It is circulated in 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 low-temperature heating medium 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 again. By the way, the concentrated absorption liquid that has absorbed the refrigerant vapor in the heating absorber 26 becomes a high-temperature, medium-concentrated absorption liquid that falls into the liquid reservoir 26a and accumulates therein. This medium-concentration absorption liquid flows through the medium-concentration absorption liquid conduit 39 and is sprayed to the dispersion device 40 of the intermediate absorber 38. As described above, the medium-concentration absorption liquid absorbs the refrigerant vapor introduced at this time. In addition,
The remaining refrigerant liquid that was not separated at the branch point 21A of the pipe line 21 described above is directly transferred to the liquid reservoir 1a of the evaporator 1.
flows into. Thereafter, the above-described operation is repeated.

In addition to the above-mentioned configuration, FIG.
A heat exchanger 47 that performs heat exchange between 3 and the medium concentrated absorption liquid pipe line 39, and a heat exchanger 47 that performs heat exchange between the rare absorption liquid pipe line 41 and the medium concentrated absorption liquid pipe line 39. FIG. 4 is a schematic system diagram of a second invention in which a container 48 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 is possible to operate in the same manner as the above-described invention, and the heat exchanger 47
By interposing the intermediate regenerator 34, the concentrated absorption liquid in the intermediate regenerator 34 is heated by the high temperature intermediate concentrated absorption liquid in the heating absorber 26 while being transferred to the heating absorber 26 via the transfer pump 32. 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 medium-concentrated absorption liquid flowing from the heating absorber 26 to the intermediate absorber 38 can
8 to the intermediate regenerator 34 is heated. 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. Heating absorber 26
As the amount of heat generated increases, the amount of heat absorbed by the heat medium circulating within 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, 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, it is possible to increase the temperature of the refrigerant vapor in the evaporator, which is one of the elements that increases the heat recovery temperature of the absorption heat pump. 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 with higher thermal 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,
18...Condenser, 23...Absorption heat pump, 2
5...Intermediate evaporator, 26...Heating absorber, 33
...Concentrated absorption liquid pipe line, 34...Intermediate regenerator, 38...
...Intermediate absorber, 39...Intermediate concentrated absorption liquid pipe line, 41...
... Dilute absorption liquid pipe line, 47, 48 ... 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 that absorbs 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 that uses a low-temperature heat source such as waste heat to extract heat at a temperature higher than the waste heat source temperature, a part of the refrigerant liquid condensed in the condenser is used as waste heat. An intermediate evaporator that heats and evaporates using low-temperature heat such as evaporator, etc., the refrigerant vapor evaporated in this intermediate evaporator is introduced, and the concentrated absorption liquid concentrated in the intermediate regenerator is introduced via a concentrated absorption liquid pipe line. A heating medium heated by high-temperature heat generated when refrigerant vapor is absorbed by the concentrated absorption liquid is circulated and supplied to the evaporator, and the medium-concentrated absorption liquid is passed through the medium-concentrated absorption liquid pipe. and a heating absorber that is supplied to the intermediate absorber, and the refrigerant evaporation temperature of the evaporator is raised by the high temperature heat medium heated by the heating absorber. Absorption heat pump. 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 that absorbs the refrigerant vapor, and an intermediate regenerator that introduces the diluted absorption liquid that has become diluted in the intermediate absorber through the diluted absorption liquid pipe and leads the refrigerant vapor to the condenser. In 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, a part of the refrigerant liquid condensed in the condenser is converted into low-temperature heat such as waste heat. An intermediate evaporator that heats and evaporates; the refrigerant vapor evaporated in this intermediate evaporator is introduced; a concentrated absorption liquid concentrated in the intermediate regenerator is introduced via a concentrated absorption liquid pipe; A heating medium heated by high-temperature heat generated by being absorbed by the absorption liquid is circulated and supplied to the evaporator, and the medium-concentration absorption liquid is supplied to the intermediate absorber via the medium-concentration absorption liquid pipe line. a heating absorber that performs heat exchange between the concentrated absorption liquid pipe line and the medium concentrated absorption liquid line; and a heat exchanger that performs heat exchange between the concentrated absorption liquid line and the medium concentrated absorption liquid line; 1. An absorption heat pump comprising: a heat exchanger for performing heat exchange in the heating absorber;