JPH0441270B2 - - 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 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 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, in the intermediate absorber 9, the concentrated absorption liquid to which the refrigerant vapor has been supplied becomes a diluted absorption liquid and is transferred through the diluted absorption liquid pipe 15 to the heat exchanger 16 in the concentrated absorption liquid pipe 13 described above. It is heated by the concentrated absorption liquid 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, and a part of it becomes refrigerant vapor and flows through the pipe 18 to the condenser 19. be introduced. This refrigerant vapor is cooled by cooling water introduced into the cooling water coil 20 from the outside and becomes a refrigerant liquid.
The liquid reservoir 1a of the evaporator 1 is
will be transferred to. The refrigerant liquid in the liquid reservoir 1a is distributed to the spraying device 2.
3, and the operation described above is returned.

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. is also 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 9 absorbs the evaporated refrigerant vapor with a concentrated absorption liquid introduced through a concentrated absorption liquid pipe 40, and a diluted absorption liquid that has become diluted in this intermediate absorber 9 passes through a diluted absorption liquid pipe 41. and an intermediate regenerator 35 for introducing the refrigerant vapor into the condenser 19 and directing the concentrated absorption liquid to the concentrated absorption liquid pipe line 40. It is an absorption heat pump designed to extract heat at a higher temperature, and includes an intermediate evaporator 26 that heats and evaporates a part of the refrigerant liquid condensed in the condenser 19 using low-temperature heat such as waste heat, and this intermediate evaporator. The refrigerant vapor evaporated in the vessel 26 is introduced, and the concentrated absorption liquid condensed in the intermediate regenerator 35 is transferred to the concentrated absorption liquid pipe 34.
A heating medium heated by high-temperature heat generated by absorption of refrigerant vapor into the concentrated absorption liquid is circulated and supplied to the evaporator 1, and the medium-concentrated absorption liquid is converted into a medium-concentrated absorption liquid. This is an absorption heat pump having a heating absorber 27 which is supplied to an intermediate regenerator 35 via a conduit 39.

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 9 absorbs the evaporated refrigerant vapor with a concentrated absorption liquid introduced through a concentrated absorption liquid pipe 40, and a diluted absorption liquid that has become diluted in this intermediate absorber 9 passes through a diluted absorption liquid pipe 41. and an intermediate regenerator 35 for introducing refrigerant vapor into the condenser 19 and directing the concentrated absorption liquid to the concentrated absorption liquid pipe line 40. The absorption heat pump extracts heat at a temperature higher than the condenser 19.
An intermediate evaporator 26 heats and evaporates a part of the refrigerant liquid condensed in the intermediate evaporator 26 using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in the intermediate evaporator 26 is introduced and condensed in the intermediate regenerator 35. The concentrated absorption liquid is connected to the concentrated absorption liquid pipe line 3.
A heating medium introduced through 4 and heated by high temperature heat generated when the refrigerant vapor is absorbed by the concentrated absorption liquid is circulated and supplied to the evaporator 1, and the medium-concentrated absorption liquid is converted into a medium-concentrated absorption liquid. Between the heating absorber 27 supplied to the intermediate regenerator 35 via the liquid pipe line 39, the concentrated absorption liquid pipe line 34 from the intermediate regenerator 35 to the heating absorber 27, and the intermediate concentrated absorption liquid pipe line 39. and a heat exchanger 49 that performs heat exchange between the concentrated absorption liquid pipe line 40 and the dilute absorption liquid pipe line 41 from the intermediate regenerator 35 to the intermediate absorber 9. This is an absorption heat pump with

〔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 dispersion device 36 is provided for dispersing the concentrated absorption liquid from the intermediate regenerator 35 transferred via the concentrated absorption liquid pipe line 34 therein. The sprayed concentrated absorption liquid absorbs the introduced refrigerant vapor and generates latent heat of condensation. A circulation supply path 37 in which a heating medium that absorbs the generated latent heat of condensation circulates.
One end 37A is installed inside the heating absorber 27, and the other end 37B is installed 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 medium-concentrated absorption liquid stored in the liquid reservoir 27a of the heating absorber 27 is transferred to the liquid reservoir 35 of the intermediate regenerator 35.
A medium-concentrated absorption liquid pipe line 39 is provided to flow into a,
The tip thereof 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 line 41 through which the dilute absorption liquid stored in the liquid reservoir 9a of the intermediate absorber 9 flows to the liquid reservoir 35a of the intermediate regenerator 35.
is connected to the bottom of the intermediate absorber 9, and the other end is connected to the branch point 39A of the aforementioned intermediate concentrated 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 thereon. 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 to the dispersion device 46, and the introduced refrigerant vapor is absorbed to generate condensation latent heat. . 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. Regenerator 4 liquid pool 4
flows into a. 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 the refrigerant vapor is introduced into the intermediate absorber 9 via the pipe line 8, and the remaining part is 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 9 is transferred to the cooling water coil 1
While being cooled on the surface of
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 low temperatures, 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. 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, liquid puddle 4
The concentration of the concentrated absorption liquid stored in a becomes higher. 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 dilute absorption liquid in the liquid reservoir 9a joins the medium-concentration absorption liquid from the heating absorber 27, which will be described later, through the dilute absorption liquid pipe line 41 at a branch point 39A of the medium-concentration absorption liquid pipe line 39, and forms a low-pressure intermediate liquid. The liquid flows into the liquid reservoir 35a of the regenerator 35. 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 is converted into refrigerant vapor and 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 cooled by the cold water supplied from the cooling water coil 20, becomes refrigerant liquid, and accumulates in the liquid reservoir 19a. The refrigerant liquid is delivered to the liquid reservoir 1 of the evaporator 1 via the pipe 22 by the pump 47.
A part of it is transferred to branch point 22A.
The liquid is divided into two streams and flows into the liquid reservoir 26a of the intermediate evaporator 26 from the branch 28. 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 37A of the circulation supply path 37. As a result, the concentrated absorption liquid absorbs the introduced refrigerant vapor at one end 3.
It is absorbed on the surface of 7A, generates latent heat of condensation, and 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 sprayer 43 is heated and turned into refrigerant vapor. As a result, the low-temperature heating medium 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 again. By the way, the concentrated absorption liquid that has absorbed the refrigerant vapor in the heating absorber 27 turns into a high-temperature medium-concentrated absorption liquid and flows into the liquid pool 2.
It falls and accumulates at 7a. The accumulated medium-concentration absorption liquid flows through the medium-concentration absorption liquid pipe 39 and joins with the dilute absorption liquid from the intermediate absorber 9 to form the liquid reservoir 35 of the intermediate regenerator 35.
The flow into a is as described above. 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. 3 shows an intermediate regenerator 35
A heat exchanger 48 that performs heat exchange between the concentrated absorption liquid pipe line 34 and the medium concentrated absorption liquid line 39 from the intermediate regenerator 35 to the heating absorber 9;
FIG. 4 is a schematic system diagram of a second invention in which a heat exchanger 49 for exchanging heat between a concentrated absorption liquid pipe line 40 and a dilute absorption liquid line 41 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 intermediate regenerator 35, the concentrated absorption liquid in the intermediate regenerator 35 is heated by the high temperature intermediate concentration absorption liquid in the heating absorber 27 while being transferred to the heating absorber 27 by the transfer pump 33. 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 temperature of the low-temperature dilute absorption liquid in vessel 9 is increased to encourage it to turn into refrigerant vapor in 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 one end 37 of the circulation supply path 37
The amount of heat absorbed by the heat medium circulating in A is increased, and the temperature of the refrigerant vapor in the evaporator 1 is increased.

〔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 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,
9... Intermediate absorber, 19... Condenser, 24... Absorption heat pump, 26... Intermediate evaporator, 27...
Heating absorber, 34, 40... Concentrated absorption liquid pipe line, 3
5...Intermediate regenerator, 39...Intermediate concentrated absorption liquid pipe line, 4
1... 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 the refrigerant vapor evaporated in the regenerator with a concentrated absorption liquid introduced through a concentrated absorption liquid pipe; and an intermediate regenerator for introducing the refrigerant vapor into the condenser and directing the concentrated absorption liquid to the concentrated absorption liquid pipe line, and a waste heat source using a low temperature heat source such as waste heat. In an absorption heat pump that extracts heat at a temperature higher than the temperature, an intermediate evaporator that heats and evaporates a part of the refrigerant liquid condensed in the condenser using low-temperature heat such as waste heat; The evaporated refrigerant vapor is introduced, and the concentrated absorption liquid condensed in the intermediate regenerator is introduced through the concentrated absorption liquid line, and the high temperature generated by the absorption of the refrigerant vapor into the concentrated absorption liquid is reduced. a heating absorber that circulates and supplies a heat medium heated by heat to the evaporator and supplies a medium-concentration absorption liquid to an intermediate regenerator via a medium-concentration absorption liquid pipe line; An absorption heat pump characterized in that the refrigerant evaporation temperature of the evaporator is raised using a high temperature heat medium heated in the evaporator. 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 by a concentrated absorption liquid introduced through a concentrated absorption liquid pipe, and a diluted absorption liquid that has become diluted in this intermediate absorber is introduced through the diluted absorption liquid pipe. It also includes an intermediate regenerator that delivers refrigerant vapor to the condenser and directs concentrated absorption liquid to the concentrated absorption liquid pipe, and uses a low temperature heat source such as waste heat to generate heat at a temperature higher than the waste heat source temperature. In an absorption heat pump designed to take out water, there is an intermediate evaporator that heats and evaporates a part of the refrigerant liquid condensed in the condenser using low-temperature heat such as waste heat, and the refrigerant vapor evaporated in the intermediate evaporator is introduced. The concentrated absorption liquid condensed in the intermediate regenerator is introduced through the concentrated absorption liquid pipe, and the refrigerant vapor is heated by the high temperature heat generated by being absorbed into the concentrated absorption liquid. a heating absorber that circulates a medium to the evaporator and supplies a medium-concentrated absorption liquid to an intermediate regenerator via a medium-concentration absorption liquid pipeline; a heat exchanger for performing heat exchange between the pipe line and the medium-concentrated absorbent liquid pipe line; and a heat exchanger that performs heat exchange between the pipe line and the concentrated absorbent liquid line from the intermediate regenerator to the intermediate absorber and the dilute absorbent liquid pipe line. An absorption heat pump comprising: a heat exchanger for performing heat exchange; and the absorption heat pump is characterized in that the refrigerant evaporation temperature of the evaporator is raised by a high-temperature heat medium heated by the heating absorber.