JP2000205689A - Absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent refrigerant steam from being recondensed or absorbed by absorbent to cause internal loss in an absorption refrigerating machine having two high temperature generator, in the case where the refrigerant steam from one high temperature generator is directed to the other high temperature generator. SOLUTION: Refrigerant steam from a first high temperature generator 4A for having absorbent from an absorber 3 flowed therein and refrigerant steam from a second high temperature generator 4B for having the absorbent from the generator 4A flowed therein, are permitted to join in the generator 4B. Alternatively, the joining portion may be the junction of first steam piping 13A for directing the refrigerant steam from the generator 4A to a low temperature generator 11 and second steam piping 13B for directing the refrigerant steam from the generator 4B to the generator 11. Further, it may be within the generator 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator, and more particularly to a piping structure of a steam piping for guiding refrigerant vapor of an absorption refrigerator having two high-temperature regenerators.

[0002]

2. Description of the Related Art FIG. 4 illustrates an absorption refrigerator having two conventional high-temperature regenerators. That is, as shown in the figure, the evaporator 2 and the absorber 3 are housed in the evaporator absorber body 1. The high-temperature regenerator 4 includes a first high-temperature regenerator 4A for flowing the absorbent from the absorber 3 and a second high-temperature regenerator 4B for flowing the absorbent from the first high-temperature regenerator 4A. First
The high temperature regenerator 4A includes a heat exchanger 4C for obtaining waste heat from exhaust gas or the like. The second high temperature regenerator 4B includes a burner 5. An absorbent pump P1, a low-temperature heat exchanger 7, and a high-temperature heat exchanger 8 are provided in the middle of the rare absorbent pipe 6 from the absorber 3 to the high-temperature regenerator 4A.

A high temperature drum 10 contains a low temperature regenerator 11 and a condenser 12. The second steam pipe 13B for guiding the refrigerant vapor from the second high-temperature regenerator 4B is connected to the first high-temperature regenerator 4A, and the first steam pipe 13A for guiding the refrigerant vapor from the first high-temperature regenerator 4A is regenerated at a low temperature. Connected to the vessel 11. Reference numeral 16 denotes a refrigerant flow down pipe from the condenser 12 to the evaporator 2, 17 denotes a refrigerant circulation pipe connected to the evaporator 2 by piping, P 2
Is a refrigerant pump. Reference numeral 21 denotes a cold water pipe connected to the evaporator 2.

[0004] Reference numeral 22 denotes an intermediate absorption liquid pipe from the high-temperature regenerator 4 to the high-temperature heat exchanger 8, and reference numeral 23 denotes an intermediate absorption liquid from the high-temperature heat exchanger 8 to the low-temperature regenerator 11. 25 is a concentrated absorption liquid pipe from the low temperature regenerator 11 to the low temperature heat exchanger 7, and 26 is a concentrated absorption liquid pipe from the low temperature heat exchanger 7 to the absorber 3.
29 is a cooling water pipe, and 30 is a device for spraying the absorbing liquid.

[0005] During operation of the absorption refrigerator configured as described above, the diluted absorption liquid flowing from the absorber 3 is heated by waste heat or the like in the first high-temperature regenerator 4A. This rare absorbing solution
For example, an absorbing solution such as an aqueous solution of lithium bromide (LiBr) (including a surfactant) contains a large amount of a refrigerant such as water. This heating causes the rare absorbing liquid to boil, and the refrigerant vapor is separated from the rare absorbing liquid. The heated rare absorbing liquid is
Further, the combustion of the burner 5 of the second high-temperature regenerator 4B causes
Heated. This also causes the rare absorbing liquid to boil, and the refrigerant vapor is separated from the rare absorbing liquid. As a result, the rare absorbing solution is concentrated into an intermediate absorbing solution having a medium concentration.

[0006] The refrigerant vapor separated in the second high-temperature regenerator 4B is guided to the first high-temperature regenerator 4A through the second vapor pipe 13B, and merges with the refrigerant vapor separated in the first high-temperature regenerator 4A. Through the first steam pipe 13A.
And heats and condenses the intermediate absorbent from the high-temperature regenerator 4. The refrigerant vapor separates from the heated intermediate absorbing liquid. The condensed refrigerant liquid flows to the condenser 12. Condenser 12
Then, the refrigerant vapor separated in the low-temperature regenerator 11 is cooled by the cooling water in the cooling water pipe 29 and condensed into a refrigerant liquid, and flows down to the evaporator 2 together with the refrigerant liquid flowing from the low-temperature regenerator 11.

In the evaporator 2, the refrigerant liquid is sprayed on the cold water pipe 21 by the operation of the refrigerant pump P 2. The sprayed refrigerant evaporates by removing heat from the water in the cold water pipe 21, and the cold water in the cold water pipe 21, which is deprived of heat of vaporization by the refrigerant and cooled to a lower temperature, is supplied to the load. The refrigerant vapor vaporized in the evaporator 2 flows to the absorber 3, is cooled by the cooling water pipe 29, and is well absorbed by the concentrated absorbent to be sprayed. This absorption promotes the vaporization of the refrigerant.

On the other hand, the intermediate absorption liquid whose concentration has increased due to separation of the refrigerant vapor in the first and second high-temperature regenerators 4A and 4B passes through the intermediate absorption liquid pipe 22, the high-temperature heat exchanger 8, and the intermediate absorption liquid pipe 23. It flows to the low-temperature regenerator 11. In the low-temperature regenerator 11, the intermediate absorption liquid is heated by the heater 14 in which the refrigerant vapor from the first high-temperature regenerator 4A flows. Then, the refrigerant vapor is separated from the intermediate absorbing liquid, and the concentration of the absorbing liquid further rises to become a concentrated absorbing liquid.

The concentrated absorbent flows into the concentrated absorbent tube 25, flows through the low-temperature heat exchanger 7 and the concentrated absorbent tube 26 to the absorber 3, and drops from the spraying device 30 onto the cooling water pipe 29. Then, the concentrated absorbent cooled by the cooling water pipe 29 absorbs the refrigerant vapor entering through the evaporator 2 well, and the refrigerant concentration becomes high, thereby becoming a rare absorbent. The rare absorbing liquid is supplied to the low-temperature heat exchanger 7 by the driving force of the absorbing liquid pump P1.
And the first high-temperature regenerator 4A
Flows into.

[0010]

However, when the refrigerant vapor is guided from the second high-temperature regenerator 4B to the first high-temperature regenerator 4A, the refrigerant vapor is cooled by the cold absorbing liquid flowing into the first high-temperature regenerator 4A. Or touch the atmosphere or surrounding area where the temperature has been lowered by the cold absorbent. Then, a part of the solution is condensed and absorbed by the absorbing solution, thereby lowering the concentration of the absorbing solution, thereby causing an internal loss in the regenerator. The present invention has been made to solve the above problems, and has as its object to eliminate internal loss of an absorption refrigerator having two high-temperature regenerators.

[0011]

Means for Solving the Problems In order to solve the above problems, a first invention has a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber. There are a first high-temperature regenerator for flowing the absorbent from the absorber and a second high-temperature regenerator for flowing the absorbent from the first high-temperature regenerator, and the refrigerant vapor from the first and second high-temperature regenerators An absorption refrigerator in which refrigerant is sent to a low-temperature regenerator, a first steam pipe for guiding refrigerant vapor from the first high-temperature regenerator to a second high-temperature regenerator, and refrigerant vapor from the second high-temperature regenerator to the low-temperature regenerator. An absorption refrigerator having a second steam pipe for guiding the refrigerant vapor, and wherein the two refrigerant vapors merge in a second high-temperature regenerator.

A second invention is a high-temperature regenerator, a low-temperature regenerator,
A first high-temperature regenerator that has a condenser, an evaporator, and an absorber, into which the absorbent from the absorber flows, and a second high-temperature that flows the absorbent from the first high-temperature regenerator. In an absorption refrigerator in which the refrigerant vapor from the first and second high-temperature regenerators is sent to the low-temperature regenerator, a first steam pipe for guiding the refrigerant vapor from the first high-temperature regenerator to the low-temperature regenerator And a second steam pipe that guides the refrigerant vapor from the second high-temperature regenerator to the low-temperature regenerator, and the two vapor pipes have a structure that merges in the middle, and the two refrigerant vapors in the middle of the steam pipe An absorption refrigerator characterized by merging.

[0013] The third invention is a high-temperature regenerator, a low-temperature regenerator,
A first high-temperature regenerator that has a condenser, an evaporator, and an absorber, into which the absorbent from the absorber flows, and a second high-temperature that flows the absorbent from the first high-temperature regenerator. In an absorption refrigerator in which the refrigerant vapor from the first and second high-temperature regenerators is sent to the low-temperature regenerator, a first steam pipe for guiding the refrigerant vapor from the first high-temperature regenerator to the low-temperature regenerator And a second steam pipe for guiding the refrigerant vapor from the second high-temperature regenerator to the low-temperature regenerator, wherein the two refrigerant vapors merge at the low-temperature regenerator.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG.
Shown in Parts having the same functions as those of the conventional example shown in FIG. 4 are denoted by the same reference numerals. That is, as shown in FIG. 1, the evaporator 2 and the absorber 3 are housed in the evaporator body 1. The high-temperature regenerator 4 is provided with a first high-temperature regenerator 4A for flowing the absorbent from the absorber 3 and a second high-temperature regenerator 4B for flowing the absorbent from the first high-temperature regenerator 4A, so to speak. Can be The first high-temperature regenerator 4A includes a heat exchanger 4C that obtains waste heat from exhaust gas, wastewater, and the like. That is, the exhaust gas and the drainage pass through the inside of the heat exchanger 4C, and the absorbing liquid passes through the outside.

Further, the second high temperature regenerator 4B is provided with a burner 5. In the middle of the rare absorbent pipe 6 from the absorber 3 to the high temperature regenerator 4A, the absorbent pump P
1, a low-temperature heat exchanger 7 and a high-temperature heat exchanger 8 are provided.

The high temperature cylinder 10 houses a low temperature regenerator 11 and a condenser 12. The first steam pipe 13A for guiding the refrigerant vapor from the first high-temperature regenerator 4A is
Connected to high temperature regenerator 4B. The second steam pipe 13B for guiding the refrigerant vapor from the second high-temperature regenerator 4B is connected to the low-temperature regenerator 1B.
Connected to 1. Reference numeral 16 denotes a refrigerant liquid downflow pipe extending from the condenser 12 to the evaporator 2, 17 denotes a refrigerant circulation pipe connected to the evaporator 2 by piping, and P2 denotes a refrigerant pump. Reference numeral 21 denotes a cold water pipe connected to the evaporator 2.

Reference numeral 22 denotes an intermediate absorption liquid pipe from the high-temperature regenerator 4 to the high-temperature heat exchanger 8, and reference numeral 23 denotes an intermediate absorption liquid from the high-temperature heat exchanger 8 to the low-temperature regenerator 11. 25 is a concentrated absorption liquid pipe from the low temperature regenerator 11 to the low temperature heat exchanger 7, and 26 is a concentrated absorption liquid pipe from the low temperature heat exchanger 7 to the absorber 3.
29 is a cooling water pipe, and 30 is a device for spraying the absorbing liquid.

(Operation of the Embodiment) During operation of the absorption refrigerator configured as described above, the diluted absorption liquid flowing from the absorber 3 is heated by waste heat or the like in the first high-temperature regenerator 4A. This rare absorbing liquid is, for example, lithium bromide (LiBr).
An absorbing solution such as an aqueous solution (including a surfactant) contains a large amount of a refrigerant such as water. This heating causes the rare absorbing liquid to boil, and the refrigerant vapor is separated from the rare absorbing liquid. The heated rare absorbing liquid is further heated by the combustion of the burner 5 of the second high-temperature regenerator 4B. This also causes the rare absorbing liquid to boil, and the refrigerant vapor is separated from the rare absorbing liquid. As a result, the rare absorbing solution is concentrated into an intermediate absorbing solution having a medium concentration.

The refrigerant vapor separated in the first high-temperature regenerator 4A is guided to the second high-temperature regenerator 4B via the first steam pipe 13A, and is generated inside the second high-temperature regenerator 4B by the second high-temperature regenerator 4B. Merges with the separated refrigerant vapor. The combined refrigerant vapor passes through the second vapor pipe 13B and passes through the low-temperature regenerator 1
1 and heats and condenses the intermediate absorbent from the second high-temperature regenerator 4B. The refrigerant vapor separates from the heated intermediate absorbing liquid. The condensed refrigerant liquid flows to the condenser 12. In the condenser 12, the refrigerant vapor separated in the low-temperature regenerator 11 is
The refrigerant is cooled by the cooling water in the cooling water pipe 29 and condensed into a refrigerant liquid, and flows down to the evaporator 2 together with the refrigerant liquid flowing from the low-temperature regenerator 11.

In the evaporator 2, the refrigerant liquid is sprayed on the cold water pipe 21 by the operation of the refrigerant pump P2. The sprayed refrigerant evaporates by removing heat from the water in the cold water pipe 21, and the cold water in the cold water pipe 21, which is deprived of heat of vaporization by the refrigerant and cooled to a lower temperature, is supplied to the load. The refrigerant vapor vaporized in the evaporator 2 flows to the absorber 3, is cooled by the cooling water pipe 29, and is well absorbed by the concentrated absorbent to be sprayed. This absorption promotes the vaporization of the refrigerant.

On the other hand, the intermediate absorption liquid whose concentration has increased due to separation of the refrigerant vapor in the first and second high-temperature regenerators 4A and 4B passes through the intermediate absorption liquid pipe 22, the high-temperature heat exchanger 8, and the intermediate absorption liquid pipe 23. It flows to the low-temperature regenerator 11. In the low-temperature regenerator 11, the intermediate absorbent is heated by the heater 14 in which the refrigerant vapor from the second high-temperature regenerator 4B flows. Then, the refrigerant vapor is separated from the intermediate absorbing liquid, and the concentration of the absorbing liquid further rises to become a concentrated absorbing liquid.

The concentrated absorption liquid flows into the concentrated absorption liquid pipe 25, flows through the low temperature heat exchanger 7 and the concentrated absorption liquid pipe 26 to the absorber 3, and drops from the spraying device 30 onto the cooling water pipe 29. Then, the concentrated absorbent cooled by the cooling water pipe 29 absorbs the refrigerant vapor entering through the evaporator 2 well, and the refrigerant concentration becomes high, thereby becoming a rare absorbent. The rare absorbing liquid is supplied to the low-temperature heat exchanger 7 by the driving force of the absorbing liquid pump P1.
And the first high-temperature regenerator 4A
Flows into.

(Effect of Embodiment) According to the above embodiment, the refrigerant vapor from the second high-temperature regenerator 4B is directly guided to the low-temperature regenerator 11. Therefore, since it is not sent to the first high-temperature regenerator 4A as in the prior art, it is possible to touch the cold absorbent flowing into the first high-temperature regenerator 4A, or to reduce the atmosphere or surroundings where the temperature is reduced by the cold absorbent. It does not touch the parts and therefore does not condense and is not absorbed by the absorbing liquid.

Although the refrigerant vapor from the first high-temperature regenerator 4A is guided to the second high-temperature regenerator 4B, the absorbing liquid flowing into the second high-temperature regenerator 4B is already in the first high-temperature regenerator 4B.
Since it is heated at A and is not cold, the refrigerant vapor does not condense. In addition, since the absorption liquid and the refrigerant vapor are both high in temperature, absorption hardly occurs. Therefore, since it is possible to avoid being absorbed by the absorbing solution and lowering the concentration of the absorbing solution, internal loss does not occur.

(Other Embodiments) In the above embodiment, the junction of the refrigerant vapor separated by the first high-temperature regenerator 4A and the refrigerant vapor separated by the second high-temperature regenerator 4B is the second high-temperature regenerator 4B However, in another embodiment, for example, as shown in FIG. 2, the junction may be in the middle of the steam pipe 13. In the drawings showing the embodiments, parts having similar functions are denoted by the same reference numerals.

That is, in FIG. 2, a first steam pipe 13A for guiding the vapor refrigerant from the first high-temperature regenerator 4A to the low-temperature regenerator 11, and a refrigerant vapor from the second high-temperature regenerator 4B is guided to the low-temperature regenerator 11. It has a structure that joins with the second steam pipe 13B on the way. With such a structure, the refrigerant vapors passing through both the steam pipes 13A and 13B merge on the way.

In the second embodiment (FIG. 2),
The refrigerant vapor from the second high-temperature regenerator 4B is
It is not sent to the high temperature regenerator 4A. Further, the refrigerant vapor from the first high-temperature regenerator 4A is not sent to the second high-temperature regenerator 4B. Therefore, the refrigerant vapor does not condense in any of the high-temperature regenerators 4A and 4B and is not absorbed by the absorbing liquid. Therefore, it is possible to avoid lowering the concentration of the absorbing solution, and it is possible to prevent the occurrence of internal loss.

Further, in another embodiment, it is possible to set the merging place in the low-temperature regenerator 11. That is, as shown in FIG. 3, a steam pipe 13A that guides the refrigerant vapor from the first high-temperature regenerator 4A to the low-temperature regenerator 11 and a second steam that guides the refrigerant vapor from the second high-temperature regenerator 4B to the low-temperature regenerator 11 It joins with the pipe 13 </ b> B in the low-temperature regenerator 11. This embodiment has the same operation and effect as the second embodiment (FIG. 2).

[0029]

As described above, according to the first, second, or third invention, the refrigerant vapor from the second high-temperature regenerator is sent to the first high-temperature regenerator as in the prior art. Because there is no contact, there is no need to touch the cold absorbing liquid flowing into the first high-temperature regenerator, or to touch the atmosphere or surrounding area where the temperature has been lowered by the cold absorbing liquid. It is possible to prevent the concentration of the absorbing solution from being lowered by being absorbed by the absorbing solution, thereby preventing the occurrence of internal loss.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an absorption refrigerator according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an absorption refrigerator according to a third embodiment of the present invention.

FIG. 4 is an explanatory view of a conventional absorption refrigerator.

[Explanation of symbols]

 2 Evaporator 3 Absorber 4A First high temperature regenerator 4B Second high temperature regenerator 11 Low temperature regenerator 12 Condenser 13A First steam pipe 13B Second steam pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hisao Miyazaki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (Reference) 3L093 AA01 BB11 BB22 BB26 BB29 BB31 LL03 MM03

Claims (3)

[Claims] 1. A high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, wherein the high-temperature regenerator has a first high-temperature regenerator for flowing an absorbent from the absorber, and a first high-temperature regenerator. There is a second high-temperature regenerator for flowing the absorbent from the high-temperature regenerator,
In an absorption refrigerator in which the refrigerant vapor from the first and second high-temperature regenerators is sent to the low-temperature regenerator, a first steam pipe for guiding the refrigerant vapor from the first high-temperature regenerator to the second high-temperature regenerator;
The second guides the refrigerant vapor from the second high-temperature regenerator to the low-temperature regenerator.
An absorption refrigerator having a steam pipe, wherein the two refrigerant vapors merge in a second high-temperature regenerator. 2. A high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, wherein the high-temperature regenerator has a first high-temperature regenerator for flowing an absorbent from the absorber, and a first high-temperature regenerator. There is a second high-temperature regenerator for flowing the absorbent from the high-temperature regenerator,
In an absorption refrigerator in which the refrigerant vapor from the first and second high-temperature regenerators is sent to the low-temperature regenerator, a first steam pipe for guiding the refrigerant vapor from the first high-temperature regenerator to the low-temperature regenerator;
A second steam pipe that guides the refrigerant vapor from the high-temperature regenerator to the low-temperature regenerator, and the two vapor pipes have a structure that merges on the way, and that the two refrigerant vapors merge in the middle of the steam pipe. Characteristic absorption refrigerator. 3. A high-temperature regenerator having a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, wherein the first high-temperature regenerator for allowing an absorbent from the absorber to flow into the high-temperature regenerator; There is a second high-temperature regenerator for flowing the absorbent from the high-temperature regenerator,
In an absorption refrigerator in which the refrigerant vapor from the first and second high-temperature regenerators is sent to the low-temperature regenerator, a first steam pipe for guiding the refrigerant vapor from the first high-temperature regenerator to the low-temperature regenerator;
An absorption refrigerator having a second steam pipe for guiding refrigerant vapor from the high-temperature regenerator to the low-temperature regenerator, wherein the two refrigerant vapors merge at the low-temperature regenerator.