JP2001349631A - Absorption type freezer machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type freezer machine in which its constitution is not complicated while improving a coefficient of performance under utilization of waste heat supplied from another facility. SOLUTION: A refrigerant heat transfer pipe 14A where refrigerant vapor generated at a high temperature regenerator 1 and supplied through a refrigerant pipe 14 flows inside it, and a waste heat transfer pipe 11A where engine cooling water cooling an engine generator of a co-generation device (not shown) through a waste heat supplying pipe 11 and heated up to about 88 deg.C circulated and supplied, are mounted at a low temperature re-generator 2. Intermediate absorption liquid supplied from the high temperature regenerator 1 through an absorption liquid pipe 15 and dispersed from above is heated to cause the refrigerant to be evaporated and separated and the absorption liquid is condensed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator having an improved coefficient of performance utilizing waste heat supplied from a cogeneration system or the like.

[0002]

2. Description of the Related Art As this type of absorption refrigerator, for example, a high-temperature regenerator 1 for evaporating and separating a refrigerant by heating an absorption liquid by a combustion heating means 1A such as a gas burner, and a heat source for supplying a refrigerant vapor supplied from the high-temperature regenerator 1 to a heat source A low-temperature regenerator 2 for heating the absorbing liquid to evaporate and separate the refrigerant, a condenser 3 provided therewith for condensing the refrigerant vapor supplied from the low-temperature regenerator 2, an evaporator 4 for evaporating the refrigerant liquid to obtain cold water, An absorber 5 for absorbing the refrigerant evaporated by the evaporator 4 into an absorbing liquid, and a hot drain supplied from a cogeneration device (not shown) via a waste heat supply pipe 11 as a heat source to heat the absorbing liquid to evaporate and separate the refrigerant. Exhaust heat regenerator 5 and an exhaust heat regenerator 6 attached to it
6 provided with an exhaust heat condenser 7 for condensing refrigerant vapor supplied from the pump, absorption liquid pumps P1, P2, refrigerant pump P3, and the like.
2. Description of the Related Art An absorption refrigerator having a configuration shown in FIG.

[0003] Further, as shown in FIG.
An absorption refrigerator in which the heat exchanger 6 and the exhaust heat regenerator 6 are arranged side by side so as to share the condenser 3 is also known.

[0004]

The absorption refrigerator having the structure shown in FIG. 6 requires a large installation space.
There is a problem that the piping becomes complicated. In the absorption refrigerator having the configuration shown in FIG. 7, refrigerant loss occurs because the absorption liquids having different concentrations are stored in the same body, and the piping in the machine is complicated. Therefore, there is a need to provide an absorption refrigerator that does not complicate the configuration while improving the coefficient of performance by utilizing the waste heat supplied from other facilities.

[0005]

According to the present invention, as a specific means for solving the above-mentioned problems in the prior art, a rare absorbing liquid having absorbed a large amount of refrigerant is heated to evaporate and separate the refrigerant, and the separated rare absorbing liquid is heated. A high-temperature regenerator for obtaining a refrigerant vapor and an intermediate absorbent; and an intermediate absorbent generated and supplied by the high-temperature regenerator, heated by the refrigerant vapor generated by the high-temperature regenerator to further evaporate and separate the refrigerant. A low-temperature regenerator that obtains a refrigerant vapor and a concentrated absorption liquid from a low-temperature regenerator, and supplies a refrigerant liquid that is heated and condensed by the intermediate absorption liquid, and cools the refrigerant vapor that is generated and supplied by the low-temperature regenerator And a refrigerant liquid supplied from the condenser and accumulated in the refrigerant liquid reservoir is sprayed on the heat transfer tubes by the refrigerant pump, and the refrigerant removes heat from the fluid flowing in the heat transfer tubes, so that the refrigerant is removed. The evaporator that evaporates and the evaporator An absorption refrigerator equipped with an absorber that supplies the refrigerant vapor to the concentrated absorption liquid that is supplied by separating the refrigerant vapor from the low-temperature regenerator into a rare absorption liquid, and supplies the absorption refrigerant to the high-temperature regenerator. An absorption refrigerator having a first configuration in which a waste heat transfer tube through which the supplied waste heat fluid flows is provided as an integral tube group inside the low-temperature regenerator, and the intermediate absorption liquid is sprayed;

[0006] In the absorption refrigerator of the first configuration, the exhaust heat transfer tube is installed above the refrigerant heat transfer tube through which the refrigerant vapor supplied from the high temperature regenerator flows inside the low temperature regenerator. An absorption refrigerator having a second configuration,

In the absorption refrigerator having the first configuration, the exhaust heat transfer tube and the refrigerant heat transfer tube through which the refrigerant vapor supplied from the high temperature regenerator flows are arranged side by side inside the low temperature regenerator. By providing the absorption refrigerator having the third configuration described above, the above-described problem of the related art is solved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below in detail with reference to FIGS. In addition, in order to facilitate understanding, in these figures, parts having the same functions as those described in FIGS. 6 and 7 are denoted by the same reference numerals.

The low-temperature regenerator 2 of the absorption refrigerator of the present invention includes:
Together with the refrigerant heat transfer pipe 14A in which the refrigerant vapor generated in the high temperature regenerator 1 and supplied through the refrigerant pipe 14 flows inside, the engine generator of the cogeneration device (not shown) is cooled through the exhaust heat supply pipe 11, for example. 8 circulated and supplied
An exhaust heat transfer tube 11A through which the engine cooling water heated to about 8 ° C. flows is provided, and is supplied from the high-temperature regenerator 1 through the absorbing solution pipe 15 to heat the intermediate absorbing solution sprayed from above. The refrigerant is evaporated and separated, and the absorption liquid is concentrated.

[0010] In the absorption refrigerator of the first embodiment, the exhaust heat transfer pipe 11 provided inside the low-temperature regenerator 2.
A and the refrigerant heat transfer tube 14A are arranged so that the exhaust heat transfer tube 11A is located above the refrigerant heat transfer tube 14A as shown in FIG. 2, and the high-temperature heat exchanger 9 is mounted on the exhaust heat transfer tube 11A. The intermediate absorbing liquid supplied from the high-temperature regenerator 1 via the nozzle is sprayed.

Therefore, in the absorption refrigerator of the first embodiment, the cooling water flows through the cooling water pipe 12 and the exhaust heat transfer pipe 11A in the low-temperature regenerator 2 through the exhaust heat supply pipe 11 is heated to about 80 ° C. Circulating the engine cooling water and igniting combustion heating means 1A such as a gas burner to ignite the high temperature regenerator 1
In the high temperature regenerator 1, a refrigerant vapor evaporated and separated from the absorption liquid and an intermediate absorption liquid in which the concentration of the absorption liquid is increased by separating the refrigerant vapor are obtained.

The high temperature generated by the high temperature regenerator 1, for example, 9
The refrigerant vapor at 0 ° C. enters the low-temperature regenerator 2 via the refrigerant pipe 14 and cooperates with the engine cooling water circulated through the exhaust heat supply pipe 11A via the exhaust heat supply pipe 11 to form the high-temperature regenerator 1. The intermediate absorption liquid generated in the low-temperature regenerator 2 through the high-temperature heat exchanger 9 by the absorption liquid pipe 15 is heated through the pipe wall of each heat transfer pipe, radiated and condensed, and enters the condenser 3.

In the low-temperature regenerator 2, the refrigerant that has been heated by the engine cooling water flowing inside the exhaust heat transfer tube 11A and the refrigerant vapor flowing inside the refrigerant heat transfer tube 14A and separated from the intermediate absorbent by evaporation passes through the eliminator 20 and condenses. The heat exchanger 3 enters the vessel 3 and exchanges heat with water flowing in the cooling water pipe 12 to condense and liquefy.
A together with the refrigerant condensed and supplied at A
Through the evaporator 4.

The refrigerant liquid that has entered the evaporator 4 and accumulated in the refrigerant liquid reservoir is sprayed by a refrigerant pump P3 onto a chilled water heat transfer pipe 13A connected to the chilled water pipe 13, and is supplied through the chilled water pipe 13. Evaporates by heat exchange with
The water flowing inside A is cooled.

The refrigerant evaporated in the evaporator 4 enters an absorber 5 provided adjacent to the evaporator 4, and is heated in the low-temperature regenerator 2 to separate the refrigerant by evaporation.
That is, it is supplied via the low-temperature heat exchanger 8 by the absorption liquid pipe 15 and is absorbed by the concentrated absorption liquid sprayed from above.
Due to the absorbing action of the refrigerant by the absorbing liquid, the evaporating action of the refrigerant in the evaporator 4 is promoted.

The absorption liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 5, that is, the diluted absorption liquid, is regenerated at a high temperature through the low-temperature heat exchanger 8 and the high-temperature heat exchanger 9 by operating the absorption liquid pump P1. It is sent to the vessel 1 from the absorption liquid pipe 15.

When the absorption chiller is operated as described above, the chilled water cooled by the heat of vaporization of the refrigerant in the chilled water heat transfer pipe 13A provided inside the evaporator 4 is cooled.
3 to a cooling load (not shown).
Cooling operation can be performed.

Further, in the absorption refrigerator of the first embodiment of the present invention, the engine cooling water supplied through the exhaust heat supply pipe 11 flows through the exhaust heat transfer pipe 11A flowing inside and the refrigerant pipe 14 through the refrigerant pipe 14. And the refrigerant heat transfer tube 14A through which the supplied refrigerant vapor flows is integrated into the low-temperature regenerator 2 in an integrated structure, so that the in-machine piping is simplified and
The equipment can be made more compact, which has made it possible to reduce manufacturing costs.

Further, the exhaust heat transfer tube 11A and the refrigerant heat transfer tube 1
4A is arranged in the same body, but since the same absorbing liquid is heated, no refrigerant loss occurs even if the absorbing liquid having a temperature lower than the saturation temperature is sprayed.

Moreover, the exhaust heat transfer tube 11A arranged on the upper side
The engine cooling water having a relatively low temperature flows through the heat transfer pipe 14A disposed below, and the refrigerant having a relatively high temperature flows through the heat transfer pipe 14A disposed below, and the absorbing liquid is sprayed to the exhaust heat transfer pipe 11A. Since the low engine cooling water heats the absorbent containing a large amount of the refrigerant and the low-absorbent liquid is heated by the higher-temperature refrigerant vapor, the evaporative separation of the refrigerant contained in the absorbent is effectively performed. .

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. To make it easier to understand,
Also in FIG. 3, the portions having the same functions as the portions described in the above-mentioned drawings are denoted by the same reference numerals.

In the absorption refrigerator of the second embodiment, the exhaust heat transfer tube 11A, to which the engine cooling water of about 88 ° C. is supplied, is connected to the condenser 3, that is, the eliminator 20 side.
Refrigerant heat transfer tubes 14A to which a refrigerant vapor of about 90 ° C. is supplied are arranged side by side so as to be located on the opposite side, and the other configuration is the same as that of the absorption refrigerator of the first embodiment.

Also in the absorption refrigerator having the above-described structure, the exhaust heat transfer tube 11A and the refrigerant heat transfer tube 14A are arranged in an integrated structure inside the low temperature regenerator 2, so that the piping inside the device is simplified, and The apparatus can be made compact and the manufacturing cost can be reduced.

In the absorption refrigerator of the second embodiment, the effect of accelerating the evaporative separation of the refrigerant by the engine cooling water utilizing the concentration difference of the absorption liquid cannot be expected, but is advantageous in the arrangement of the equipment. When the exhaust heat transfer tube 11A and the refrigerant heat transfer tube 14A are arranged side by side in this manner, it is more effective to arrange the exhaust heat transfer tube 11A on the condenser 3 side. This is advantageous because it is less susceptible to pressure loss.

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

For example, as shown in FIG. 4, a rare absorbing liquid having a reduced absorbing liquid concentration due to absorption of refrigerant vapor by the absorbing device 5 is:
Absorbent liquid that is branched and supplied to the high-temperature regenerator 1 and the low-temperature regenerator 2 and is concentrated by evaporating and separating the refrigerant in the high-temperature regenerator 1 and is concentrated by evaporating and separating the refrigerant in the low-temperature regenerator 2 May be connected to the absorber 5 so as to return to the absorber 5.

As shown in FIG. 5, a rare absorbing liquid whose absorption liquid concentration has been reduced by absorbing the refrigerant vapor in the absorber 5 is first supplied to the low-temperature regenerator 2, and the low-temperature regenerator 2 removes the refrigerant. The absorption liquid concentrated by evaporation separation is supplied to the high-temperature regenerator 1,
The absorption liquid pipe 15 may be provided so that the absorption liquid concentrated by evaporating and separating the refrigerant in the high temperature regenerator 1 is returned from the high temperature regenerator 1 to the absorber 5.

Then, as shown in FIGS. 4 and 5, a part or all of the rare absorbing liquid whose absorption liquid concentration has been reduced by absorbing the refrigerant vapor in the absorber 5 is supplied to the low-temperature regenerator 2. In the absorption refrigerator in which the absorption liquid pipe 15 is provided, the intermediate absorption liquid concentrated by evaporating and separating the refrigerant in the high-temperature regenerator 1 is supplied to the low-temperature regenerator 2 according to the first embodiment shown in FIG. Compared to the refrigerator, the operation of evaporating and separating the refrigerant in the low-temperature regenerator 2 by supplying engine cooling water having a relatively low temperature to the exhaust heat transfer tube 11A via the exhaust heat supply tube 11 can be performed more effectively. (The exhaust heat transfer tube 11A and the refrigerant heat transfer tube 14A may have the arrangement shown in FIG. 3).

The heat source for heating the absorbing liquid in the high-temperature regenerator 1 to evaporate and separate the refrigerant may be high-temperature water of about 150 to 190 ° C., saturated steam of about 400 to 800 kPa, etc. Low-temperature regenerator 2 through heat supply pipe 11
As the heat fluid supplied to the water, low-temperature water of about 85 to 95 ° C, high-temperature water of about 100 to 130 ° C, 100 to 150k
It may be saturated vapor of about Pa.

[0030]

As described above, according to the present invention, the heat fluid for transferring the waste heat supplied from another device such as a cogeneration device flows through the heat transfer tube inside and the high-temperature regenerator. The heat transfer tubes through which the refrigerant vapor flows inside are integrated with the low-temperature regenerator, so that the piping inside the machine is simplified and the equipment can be made more compact, thereby reducing manufacturing costs. Became possible.

Although the exhaust heat transfer tube and the refrigerant heat transfer tube are arranged in the same body, the same absorption liquid is heated, so that the absorption liquid having a temperature lower than the saturation temperature is sprayed. However, no refrigerant loss occurs.

[0032] Further, an exhaust heat transfer tube through which a heat fluid such as engine cooling water having a relatively low temperature flows is disposed on the upper side, and a refrigerant heat transfer tube through which a relatively high temperature refrigerant flows flows is disposed below. According to the invention, by dispersing the absorbing liquid in the upper exhaust heat transfer pipe, the heat fluid such as low-temperature engine cooling water heats the absorbing liquid containing a large amount of the refrigerant, and the absorption in which the refrigerant is reduced is reduced. Since the liquid is heated by the higher temperature refrigerant vapor, the refrigerant contained in the absorbing liquid is more effectively evaporated and separated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a first embodiment.

FIG. 2 is an explanatory diagram showing a main part of the first embodiment.

FIG. 3 is an explanatory diagram showing a main part of a second embodiment.

FIG. 4 is an explanatory diagram showing another example that can be implemented.

FIG. 5 is an explanatory diagram showing still another example that can be implemented.

FIG. 6 is an explanatory diagram showing a conventional technique.

FIG. 7 is an explanatory diagram showing another conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Condenser 4 Evaporator 5 Absorber 6 Waste heat regenerator 7 Waste heat condenser 8 Low temperature heat exchanger 9 High temperature heat exchanger 11 Waste heat supply pipe 11A Waste heat transfer pipe 12 Cooling water pipe 13 Chilled water pipe 14 Refrigerant pipe 14A Refrigerant heat transfer pipe 15 Absorbing liquid pipe 16 Chilled water pipe 20 Eliminator P1 Absorbing liquid pump P2 Refrigerant pump P3 Absorbing liquid pump

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Ohno 1 Otsukicho, Ashikaga, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Shinichi Kamigo 1 Otsukimachi, Ashikaga, Tochigi Sanyo Electric Air Conditioning F term in reference (reference) 3L093 BB11 BB22 BB26 BB31 BB32 MM02 MM07

Claims (3)

[Claims] 1. A high-temperature regenerator that heats a rare absorbing liquid that has absorbed a large amount of a refrigerant to evaporate and separate the refrigerant, and obtains refrigerant vapor and an intermediate absorbing liquid from the rare absorbing liquid. A low-temperature regenerator that heats the intermediate absorption liquid to be produced with the refrigerant vapor generated by the high-temperature regenerator and further evaporates and separates the refrigerant to obtain a refrigerant vapor and a concentrated absorption liquid from the intermediate absorption liquid. Is supplied with the refrigerant liquid condensed by heating the refrigerant, and cools the refrigerant vapor generated and supplied by the low-temperature regenerator to obtain a refrigerant liquid; and a condenser supplied from the condenser and accumulated in the refrigerant liquid reservoir. The refrigerant liquid is sprayed onto the heat transfer tubes by the refrigerant pump, and the evaporator evaporates the refrigerant by removing heat from the fluid flowing in the heat transfer tubes, and the low-temperature regenerator Separates refrigerant vapor from water and absorbs it into the concentrated absorbent supplied An absorption heat exchanger having an absorber supplied to the high-temperature regenerator, and an exhaust heat transfer pipe, through which the exhaust heat fluid supplied from the outside flows inside, is integrated into the low-temperature regenerator. An absorption refrigerator provided as a tube group and spraying an intermediate absorption liquid. 2. The heat exchanger according to claim 1, wherein the exhaust heat transfer tube is disposed above the refrigerant heat transfer tube through which the refrigerant vapor supplied from the high temperature regenerator flows.
The absorption refrigerator described. 3. The low-temperature regenerator according to claim 1, wherein the exhaust heat transfer tube and the refrigerant heat transfer tube through which the refrigerant vapor supplied from the high-temperature regenerator flows inside are installed side by side. Absorption refrigerator.