JP2001082821A - Absorption heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance COP by reducing the quantity of heat being thrown into an evaporator through an arrangement wherein refrigerant liquid generated from a condenser is heated in a refrigerant/absorbing liquid heat exchanger with high temperature absorbing liquid returned from a desorber through an absorbing liquid return pipe before being supplied to the evaporator. SOLUTION: The absorption heat pump comprises a regenerator 1, a condenser 2, an evaporator 3, an absorber 4, a resorber 5 where refrigerant vapor supplied from the evaporator 3 is absorbed into absorbing liquid, and a desorber 6 for heating the absorbing liquid having high refrigerant concentration supplied from the resorber 5 to separate the refrigerant from the absorbing liquid through evaporation, supplying the absorbing liquid having lowered refrigerant concentration to a heat exchanger 8 also supplied with absorbing liquid from the resorber 5 and returning the heat exchanged absorbing liquid back to the resorber 5, and supplying refrigerant vapor separated from the absorbing liquid through evaporation to the absorber 4. The absorption heat pump further comprises a heat exchanger 9 for exchanging heat between refrigerant liquid supplied from the condenser 2 to the evaporator 3 and absorbing liquid being returned from the desorber 6 back to the resorber 5, and a heat exchanger 10 for exchanging heat between absorbing liquid being supplied from the regenerator 1 to the absorber 4 and refrigerant liquid being returned from the desorber 6 back to the resorber 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a regenerator, a condenser,
The present invention relates to an absorption heat pump device including a evaporator, an absorber, and the like, as well as a reservoir and a desorber.

[0002]

2. Description of the Related Art The heat of evaporation of a refrigerant and the heat of regeneration of a solution are supplied from hot waste water or the like, and the evaporator is set at an intermediate pressure as shown in FIG. Absorbed by a combination of a first-class absorption heat pump and a second-class absorption heat pump, in which the absorbed solution is regenerated by a low-pressure desorber and the generated refrigerant is absorbed by a first-class cycle absorber. In the heat pump device, heat is absorbed by the evaporator and the desorber, and the heat is released by the condenser, the second-cycle reactor and the first-cycle absorber, so that there is an advantage that the COP during heating becomes 2 or more. .

[0003]

In the absorption heat pump apparatus having the above structure, it is necessary to further improve the efficiency, and this has been a problem to be solved.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a regenerator for heating an absorption liquid to evaporate and separate a refrigerant from the absorption liquid, and cooling and condensing refrigerant vapor supplied from the regenerator. A condenser for heating and evaporating a refrigerant liquid supplied from the condenser, and an evaporator for evaporating and separating the refrigerant to absorb the refrigerant in an absorbent having a reduced concentration of the refrigerant supplied from the regenerator, thereby regenerating the refrigerant. An absorber that exchanges heat with the absorbing liquid supplied from the evaporator and returns to the regenerator; a absorber that absorbs the refrigerant vapor supplied from the evaporator into the absorbing liquid; and a refrigerant that absorbs the refrigerant and is supplied from the reservoir. Heating the absorbing liquid with the increased concentration causes the refrigerant to evaporate and separate from the absorbing liquid, and heat-exchanging the absorbing liquid with the decreasing concentration of the absorbing liquid with the absorbing liquid supplied from the reservoir to return to the reservoir and evaporating from the absorbing liquid. Absorbs separated refrigerant vapor In the absorption heat pump apparatus having a Desoba supplied to,

[0005] A first refrigerant / absorbent heat exchanger for exchanging heat between the refrigerant liquid supplied from the condenser to the evaporator and the absorbing liquid returned from the desorber to the reservoir.
An absorption heat pump device having the structure of

[0006] A second structure is provided with an absorbing liquid / absorbing liquid heat exchanger for exchanging heat between the absorbing liquid supplied to the absorber from the regenerator and the absorbing liquid returned from the desorber to the reservoir. An absorption heat pump device,

[0007] A refrigerant / absorbent heat exchanger for exchanging heat between the refrigerant liquid supplied from the condenser to the evaporator and the absorbing liquid returned from the desorber to the reservoir, and supplied from the regenerator to the absorber. An absorption heat pump device having a third configuration, comprising: an absorption liquid / absorption liquid heat exchanger that exchanges heat between the absorption liquid and the absorption liquid returned from the desorber to the reservoir;

[0008] In the absorption heat pump device of the first or third configuration, the refrigerant / absorbent liquid heat exchanger is provided with a desorber at a liquid seal portion bent downward in a refrigerant liquid pipe from the condenser to the evaporator. In the absorption liquid return pipe from the reservoir to the reservoir, the absorption liquid supplied from the reservoir to the reservoir and the absorption liquid returned from the reservoir to the reservoir are disposed closer to the reservoir than the heat exchanger that exchanges heat. An absorption heat pump device having the structure of

In the absorption heat pump device of the second or third configuration, the absorption liquid / absorption liquid heat exchanger is supplied from the regenerator to the absorber in a refrigerant liquid supply pipe from the regenerator to the absorber. Absorbent liquid being supplied to the reservoir from the reservoir in the absorbent return pipe from the heat exchanger to the absorber, where heat is exchanged between the absorbent and the absorbent returned from the absorber to the regenerator. And an absorption heat pump device having a fifth configuration in which the absorption liquid is returned to the reservoir from the heat exchanger in which the absorption liquid returned to the reservoir from the desorber exchanges heat.

[0010] In the absorption heat pump device of the third configuration, the refrigerant / absorbent liquid heat exchanger is connected to the liquid seal portion bent downward in the refrigerant liquid pipe from the condenser to the evaporator, and from the desorber to the reservoir. In the absorption liquid returning pipe, the absorption liquid supplied from the reservoir to the desorber and the absorption liquid returned from the desorber to the reservoir are installed on the desorber side from a heat exchanger where heat exchange is performed. In the refrigerant liquid supply pipe from the regenerator to the absorber, the heat exchanger exchanges heat between the absorbent supplied from the regenerator to the absorber and the absorbent returned from the absorber to the regenerator. On the absorber side, in the absorbent return pipe from the reservoir to the reservoir, heat is exchanged between the absorbent supplied from the reservoir to the reservoir and the absorbent returned from the reservoir to the reservoir. 6 the absorption heat pump apparatus of the configuration of which is adapted to placed in Risoba side of exchanger, there is provided a.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. The example illustrated in FIG. 1 uses water as a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid.
It is an absorption heat pump device for performing a heating function such as heating.

The absorption heat pump device shown in FIG. 1 is a regenerator 1 for heating an absorption liquid and evaporating and separating a refrigerant from the absorption liquid.
And a condenser 2 for cooling and condensing the refrigerant vapor supplied from the regenerator 1, and a refrigerant liquid supply pipe 1 from the condenser 2.
The evaporator 3 heats and evaporates the refrigerant liquid supplied through the evaporator 1, and the evaporator 3 evaporates and separates the refrigerant to reduce the concentration of the refrigerant supplied from the regenerator 1 via the absorbent supply pipe 12. An absorber 4 for absorbing the refrigerant, exchanging heat in the heat exchanger 7 with the absorbing liquid supplied from the regenerator 1 via the absorbing liquid supply pipe 12 and returning the heat to the regenerator 1 via the absorbing liquid return pipe 13; A absorber 5 that absorbs the refrigerant vapor supplied from the evaporator 3 into the absorbing liquid, and an absorbing liquid that absorbs the refrigerant and has an increased concentration of the refrigerant supplied from the reservoir 5 through the absorbing liquid supply pipe 14. The refrigerant is evaporated and separated from the absorbing liquid, and the absorbing liquid having the reduced concentration of the refrigerant is heat-exchanged by the heat exchanger 8 with the absorbing liquid supplied from the reservoir 5 through the absorbing liquid supply pipe 14 and absorbed by the reservoir 5. The liquid is returned through the liquid return pipe 15 and separated from the absorbent by evaporation. And a Desoba 6 supplied to the absorber 4 refrigerant vapors.

The refrigerant liquid supplied from the condenser 2 to the evaporator 3 via the refrigerant liquid supply pipe 11 and the absorption liquid returned from the desorber 6 to the reservoir 5 via the absorption liquid return pipe 15 The refrigerant / absorbent liquid heat exchanger 9 for exchanging heat is located at the position shown in the drawing, that is, the refrigerant liquid supply pipe 11 bent below the connecting portion to the evaporator 3 so that the refrigerant liquid does not become empty. The liquid seal portion 11A and the absorbent return pipe 15 between the desorber 6 and the heat exchanger 8 are provided.

Further, the regenerator 1 is connected to the
The absorbent / absorbent heat exchanger 10 in which the heat exchange between the absorbent supplied to the absorber 4 and the refrigerant liquid returned from the desorber 6 to the reservoir 5 via the absorbent return pipe 15 is shown. At the position, that is, at the portion of the absorbent supply pipe 12 between the heat exchanger 7 and the absorber 4 and at the portion of the absorbent return pipe 15 between the heat exchanger 8 and the reservoir 5.

A heat transfer tube 1A is provided inside the regenerator 1, and a high-temperature saturated steam of, for example, about 170 ° C. is supplied as a driving heat source into the heat transfer tube 1A.
Is heated by the absorbing liquid pump P1 through the absorbing liquid return pipe 13 to spray the absorbing liquid from the sprayer 1B onto the heat transfer pipe 1A to generate refrigerant vapor to be supplied to the condenser 2. Has become.

A heat transfer tube 2A is provided inside the condenser 2, and the cooling water flowing inside the heat transfer tube 2A is supplied to the regenerator 1
Is heated by the condensing heat of the refrigerant supplied and liquefied by the heat, and is supplied to a heat load as hot water of about 80 ° C., for example.

A heat transfer tube 3A is provided inside the evaporator 3, and a heat source such as 60 ° C. is provided inside the heat transfer tube 3A.
Is supplied to the refrigerant liquid supply pipe 1 from the condenser 2.
1 and is heated by the refrigerant pump P3 of the refrigerant liquid pipe 16 and sprayed from the sprayer 3B onto the heat transfer pipe 3A to generate refrigerant vapor to be supplied to the reservoir 5. I have.

A heat transfer tube 6A is provided inside the desorber 6, and hot drainage of, for example, about 60 ° C. is supplied as a heat source into the heat transfer tube 6A.
Heating the absorbing liquid supplied via the sprayer 4 onto the heat transfer tube 6A from the sprayer 6B generates refrigerant vapor to be supplied to the absorber 4.

A heat transfer tube 4A is provided inside the absorber 4, and the absorbing liquid supplied from the regenerator 1 by the cooling water flowing inside the heat transfer tube 4A and sprayed from the sprayer 4B onto the heat transfer tube 4A. Is cooled, and the refrigerant vapor supplied from the desorber 6 is easily absorbed.

A heat transfer tube 5A is provided in the interior of the reservoir 5, and the cooling water flowing out from the heat transfer tube 4A to the cooling water tube 17 by performing a cooling action in the absorber 4 flows through the inside of the heat transfer tube 5A. The pump P <b> 2 cools the absorbing liquid returned through the absorbing liquid return pipe 15 and sprayed from the sprayer 5 </ b> B onto the heat transfer pipe 5 </ b> A, thereby facilitating absorption of the refrigerant vapor supplied from the evaporator 3.

Then, the cooling water passes through the heat transfer tube 4A of the absorber 4 and the heat transfer tube 5A of the reservoir 5 to perform a cooling action, and the cooling water whose own temperature has been increased is heated to, for example, 75 ° C. to be used hot water. The heat load is supplied through a cooling water pipe 17.

In the absorption heat pump apparatus of the present invention having the above-described structure, the refrigerant liquid condensed and generated in the condenser 2 is returned from the desorber 6 to the reservoir 5 through the absorption liquid return pipe 15 to the high-temperature absorption liquid. As a result, the heat is supplied to the evaporator 3 by being heated by the refrigerant / absorbent liquid heat exchanger 9, so that the amount of heat to be supplied to the evaporator 3 is small, and the COP can be improved.

The regenerator 1 is heated by a driving heat source by the absorbing liquid cooled in the refrigerant / absorbing liquid heat exchanger 9 and returned to the reservoir 5 through the absorbing liquid return pipe 15, thereby evaporating and separating the refrigerant. The high-temperature absorbing liquid discharged to the absorbing liquid supply pipe 12 is cooled by the absorbing liquid / absorbing liquid heat exchanger 10 and supplied to the absorbing member 4. In the absorbing member 4, the refrigerant vapor is quickly converted into the absorbing liquid. Absorbed, this also leads to COP
Can be improved.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

For example, when a steam trap is provided in the refrigerant liquid pipe 11 from the condenser 2 to the evaporator 3, a refrigerant / absorbent liquid heat exchanger may be provided between the trap and the evaporator 3. good.

[0026]

As described above, according to the present invention, COP
Can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an absorption heat pump device according to the present invention.

FIG. 2 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Regenerator 1A Heat transfer tube 1B Spreader 2 Condenser 2A Heat transfer tube 3 Evaporator 3A Heat transfer tube 3B Spreader 4 Absorber 4A Heat transfer tube 4B Spreader 5 Resolver 5A Heat transfer tube 5B Spreader 6 Desorber 6A Heat spreader 6A Heat spreader 6A Heat spreader・ 8 Heat exchanger 9 Refrigerant / absorbent liquid heat exchanger 10 Absorbent / absorbent liquid heat exchanger 11 Refrigerant liquid supply pipe 11A Liquid seal part 12 Absorbent liquid supply pipe 13 Absorbent liquid return pipe 14 Absorbent liquid supply pipe 15 Absorbent liquid return Pipe 16 Refrigerant liquid pipe 17 Cooling water pipe P1, P2 Absorbent pump P3 Refrigerant pump

Claims (6)

[Claims] 1. A regenerator for heating an absorbing liquid to evaporate and separate a refrigerant from an absorbing liquid, a condenser for cooling and condensing a refrigerant vapor supplied from the regenerator, and a refrigerant liquid supplied from the condenser. An evaporator that heats and evaporates and an evaporator that separates the refrigerant by evaporation and absorbs the refrigerant into a reduced concentration of the refrigerant supplied from the regenerator, and exchanges heat with the absorbent supplied from the regenerator for regeneration An absorber that returns to the vessel, a reservoir that absorbs the refrigerant vapor supplied from the evaporator into the absorbing liquid, and an absorbent that absorbs the refrigerant and heats the absorbing liquid in which the concentration of the refrigerant supplied from the reservoir has increased to absorb the refrigerant. And a desorber that supplies heat to the absorbing liquid having a reduced concentration of the refrigerant with the absorbing liquid supplied from the reservoir and returns the absorbing liquid to the absorber, and supplies the refrigerant vapor evaporated and separated from the absorbing liquid to the absorber. Absorption heat pump An absorption heat pump device, comprising: a refrigerant / absorbent heat exchanger for exchanging heat between a refrigerant liquid supplied from a condenser to an evaporator and an absorbing liquid returned from a desorber to a reservoir. . 2. A regenerator for heating an absorption liquid to evaporate and separate a refrigerant from the absorption liquid, a condenser for cooling and condensing refrigerant vapor supplied from the regenerator, and a refrigerant liquid supplied from the condenser. An evaporator that heats and evaporates and an evaporator that separates the refrigerant by evaporation and absorbs the refrigerant into a reduced concentration of the refrigerant supplied from the regenerator, and exchanges heat with the absorbent supplied from the regenerator for regeneration An absorber that returns to the vessel, a reservoir that absorbs the refrigerant vapor supplied from the evaporator into the absorbing liquid, and an absorbent that absorbs the refrigerant and heats the absorbing liquid in which the concentration of the refrigerant supplied from the reservoir has increased to absorb the refrigerant. And a desorber that supplies heat to the absorbing liquid having a reduced concentration of the refrigerant with the absorbing liquid supplied from the reservoir and returns the absorbing liquid to the absorber, and supplies the refrigerant vapor evaporated and separated from the absorbing liquid to the absorber. Absorption heat pump An absorption heat pump, comprising: an absorption liquid / absorption liquid heat exchanger for exchanging heat between an absorption liquid supplied from a regenerator to an absorber and an absorption liquid returned from a desorber to a reservoir. apparatus. 3. A regenerator for heating the absorbing liquid to evaporate and separate the refrigerant from the absorbing liquid, a condenser for cooling and condensing the refrigerant vapor supplied from the regenerator, and a refrigerant liquid supplied from the condenser. An evaporator that heats and evaporates and an evaporator that separates the refrigerant by evaporation and absorbs the refrigerant into a reduced concentration of the refrigerant supplied from the regenerator, and exchanges heat with the absorbent supplied from the regenerator for regeneration An absorber that returns to the vessel, a reservoir that absorbs the refrigerant vapor supplied from the evaporator into the absorbing liquid, and an absorbent that absorbs the refrigerant and heats the absorbing liquid in which the concentration of the refrigerant supplied from the reservoir has increased to absorb the refrigerant. And a desorber that supplies heat to the absorbing liquid having a reduced concentration of the refrigerant with the absorbing liquid supplied from the reservoir and returns the absorbing liquid to the absorber, and supplies the refrigerant vapor evaporated and separated from the absorbing liquid to the absorber. Absorption heat pump A refrigerant / absorptive liquid heat exchanger in which the refrigerant liquid supplied from the condenser to the evaporator exchanges heat with the absorbing liquid returned from the desorber to the reservoir;
An absorption heat pump device comprising: an absorption liquid / absorption liquid heat exchanger for exchanging heat between an absorption liquid supplied from a regenerator to an absorber and an absorption liquid returned from a desorber to a reservoir. 4. A refrigerant / absorbent liquid heat exchanger is provided with a liquid seal section bent downward in a refrigerant liquid pipe extending from a condenser to an evaporator, and is provided with a reservoir in an absorbing liquid return pipe extending from a desorber to a reservoir. The absorption heat pump device according to claim 1 or 3, wherein the absorption liquid supplied to the desorber and the absorption liquid returned from the desorber to the reservoir are disposed on the desorber side with respect to a heat exchanger that exchanges heat. 5. An absorbing liquid / absorbing liquid heat exchanger is connected to a refrigerant liquid supply pipe extending from a regenerator to an absorber. The absorbing liquid supplied from the regenerator to the absorber and returned from the absorber to the regenerator. On the absorber side from the heat exchanger where the absorbed liquid exchanges heat with the absorber, in the absorbent return pipe from the reservoir to the reservoir, the absorbent supplied from the reservoir to the reservoir and the absorbent returned from the reservoir to the reservoir The absorption heat pump device according to claim 2 or 3, wherein the heat exchanger is disposed closer to the reservoir than the heat exchanger that exchanges heat. 6. A refrigerant / absorbent liquid heat exchanger is provided with a liquid seal section bent downward in a refrigerant liquid pipe extending from a condenser to an evaporator, and is provided with a reservoir in an absorbing liquid return pipe extending from a desorber to a reservoir. The absorption liquid that is supplied to the desorber and the absorption liquid that is returned from the desorber to the reservoir is installed on the desorber side from a heat exchanger that exchanges heat.
In the refrigerant liquid supply pipe from the regenerator to the absorber, the absorbent heat exchanger exchanges heat between the absorbent supplied from the regenerator to the absorber and the absorbent returned from the absorber to the regenerator. On the absorber side from the heat exchanger, in the absorption liquid return pipe from the reservoir to the reservoir, from the heat exchanger where heat is exchanged between the absorption liquid supplied from the reservoir to the reservoir and the absorption liquid returned from the reservoir to the reservoir The absorption heat pump device according to claim 3, wherein the absorption heat pump device is provided on a reservoir side.