JPH09236350A - Absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the crystallization of a salute in a waste heat feed type absorption refrigerating machine by preventing a solution in a hot heat source heat exchanger from being concentrated. SOLUTION: In this absorption type refrigerating machine, in which a hot heat source heat exchanger 8 for heat exchange between a fluid supplied from a hot heat source outside the absorption type refrigerating machine and a dilute solution of an absorbent flowing through a dilute solution line is provided in the dilute solution line of an absorbent including a high temperature solution heat exchanger 18 and a low temperature solution heat exchanger 17, inlet and outlet side pipes 19, 20 connected to the heat exchanger 8 are formed at a level below the exchanger 8 so that water vapor generated in the dilute solution line in the exchanger 8 is prevented from going out of the line and hence saturated vapor pressure is provided to prevent the concentration of the solution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly to an exhaust heat input type absorption refrigerating machine in which exhaust heat from another device is effectively used as a part of its heat source.

[0002]

2. Description of the Related Art Although hot water or low-pressure steam of about 30 ° C. to 120 ° C. is generated from a cogeneration system or the like, an absorption refrigerator having an effective use of such a heat source has been developed. In this absorption refrigerator, the heat source is used as efficiently as possible, and in using it,
It is necessary to prevent crystallization of the solution in the absorption refrigerator piping.

[0003]

One of the present applicants has previously proposed such an exhaust heat input type absorption refrigerator (Japanese Patent Application No. 6-73428). The operation of the absorption refrigerator will be described below with reference to FIG. 7. In FIG. 7, the flow directions of cold water, cooling water, a refrigerant, and a solution are indicated by arrows. The evaporator 1 is maintained at about one-hundredth atmospheric pressure, in which the refrigerant 2 (water) is sprayed by a refrigerant pump 3 provided in a refrigerant pipe 13 onto an evaporator heat transfer tube 4 through which cold water flows. , Takes the heat of cold water and evaporates to generate a cooling effect. The evaporated refrigerant vapor flows into the absorber 5 kept at a low pressure by the cooling water, is absorbed by the lithium bromide aqueous solution sprayed on the absorber heat transfer tube 6, and the lithium bromide aqueous solution is diluted. This dilute solution is passed through a low temperature solution heat exchanger 17 and a heat exchanger 8 for a heat source by a solution pump 7 provided in a dilute solution pipe 14, and a part thereof is passed through a high temperature solution heat exchanger 18 to a high temperature regenerator 9
And the rest are sent to the low temperature regenerator 10.

In the high temperature regenerator 9, a direct heat source 1 such as a burner is used.
It is heated by 1 and separated into steam and concentrated solution, and the concentrated solution passes through a high temperature solution heat exchanger 18 and a low temperature solution heat exchanger 17, and then is concentrated solution pipe 15 onto the absorber heat transfer tube 6 in the absorber 5. Is sprayed. In the low-temperature regenerator 10, the dilute solution is heated by the steam generated in the high-temperature regenerator 9 to be separated into a vapor and a concentrated solution.
Is sprayed onto the absorber heat transfer tube 6 in the absorber 5 by the concentrated solution pipe 15. On the other hand, the drain condensed by heating the solution in the low temperature regenerator 10 is guided to the condenser 12. The refrigerant vapor generated in the low-temperature regenerator 10 is condensed in the condenser 12. The condensed refrigerant (liquid refrigerant) thus produced is guided to the evaporator 1 via the condensed refrigerant pipe 16, and is sprayed to make a cycle.

In such an exhaust heat input type absorption refrigerating machine, when exhaust heat enters especially while refrigeration is stopped, the solution coming from the solution pump is concentrated and crystals are likely to be generated in the pipe.
As a conventional method for dissolving and removing the crystals generated in such a pipe, there has been one in which a U-shaped seal pipe is provided along with the absorbent solution line. This U-shaped seal pipe is a bypass in case the solute crystals are clogged in the absorbent solution line and is a device for removing the crystals by flowing the high temperature solution from the generator to the absorbent solution line. By Shuichi Takada, Absorption Refrigerator and Heat Pump, No. 45
page).

However, according to this method, it may take several hours, sometimes several days, to dissolve the crystals of the solute formed, and during that time, the capacity of the absorption refrigerating machine is lowered, and in some cases, refrigeration becomes completely impossible. There was a problem.

It is an object of the present invention to provide an exhaust heat input type absorption refrigerating machine which does not remove the solute crystals formed but prevents the solute from crystallizing.

[0008]

In order to achieve the above object, a first invention relating to an absorption refrigerator according to the present invention is an evaporator, an absorber, a condenser, a high temperature regenerator, a low temperature regenerator, and a high temperature solution. A rare absorbent containing a heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these, and including the high temperature solution heat exchanger and the low temperature solution heat exchanger. In an absorption refrigerator in which a heat exchanger for a heat source for exchanging heat between a fluid supplied from a heat source outside the absorption refrigerator and the dilute solution flowing in the dilute solution line is provided in the solution line The gist of the present invention is that the paths of the dilute solution pipes on the inlet side and the outlet side connected to the heat exchanger for warm heat source are formed below the heat exchanger for warm heat source.

In order to achieve the above object, according to the configuration of the second invention relating to the absorption refrigerator of the present invention, the evaporator, the absorber, the condenser, the high temperature regenerator, the low temperature regenerator, and the high temperature solution. A rare absorbent containing a heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these, and including the high temperature solution heat exchanger and the low temperature solution heat exchanger. In an absorption refrigerator in which a heat exchanger for a heat source for exchanging heat between a fluid supplied from a heat source outside the absorption refrigerator and the dilute solution flowing in the dilute solution line is provided in the solution line The paths of the dilute solution pipes on the inlet side and the outlet side connected to the heat exchanger for the heat source are formed in a U shape.

Further, in the third invention relating to the absorption refrigerator according to the present invention for achieving the above object, an evaporator, an absorber, a condenser, a high temperature regenerator, a low temperature regenerator, a high temperature solution heat exchanger, A low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system that operatively couples these, and to a dilute solution line of an absorbent containing the high temperature solution heat exchanger and the low temperature solution heat exchanger, An absorption refrigerator in which a heat exchanger for a heat source for exchanging heat between a fluid supplied from a heat source outside the absorption refrigerator and the dilute solution flowing in the dilute solution line is interposed, Heat exchanger, the high temperature solution heat exchanger and the low temperature solution heat exchanger are integrally formed, and the hot heat source heat exchanger is located at a position higher than the high temperature solution heat exchanger and the low temperature solution heat exchanger. It is provided in.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Since the present invention has the above-mentioned structure, the solution in the heat exchanger for the heat source is warmed due to a malfunction of the heat source outside the absorption refrigerator while the absorption refrigerator is stopped. Even if steam is generated, the vapor does not flow out of the heat exchanger for the heat source due to the solution column in the pipe. Therefore, excessive concentration of the above solution can be prevented. As described above, crystallization of solute can be prevented. If the pipe from the exhaust heat source to the heat exchanger 8 for the heat source is closed using a valve or the like, the solution will not be concentrated but the utilization of the exhaust heat will be reduced.

An embodiment of the first invention will be described with reference to FIG. All the reference numerals in FIG. 1 represent the same portions as the corresponding reference numerals in FIG. 7, and the basic operation thereof is Japanese Patent Application No. 6-73.
The operation of the device described in 428 is the same. The feature of the first invention is that, in FIG. 1, the paths of the dilute solution pipes 19 and 20 extending from the heat exchanger 8 for heat source are formed below the heat exchanger 8 for heat source. . The operation of the embodiment having such a configuration will be described. Even if the solution in the heat exchanger 8 for heat source is warmed due to a malfunction of the exhaust heat source while the absorption chiller is stopped and water vapor is generated, the rare case connected to the heat exchanger 8 for heat source is rare. Since the solution pipes 19 and 20 are formed below the heat exchanger 8 for the heat source, the generated water vapor generates the dilute solution pipes 19 and 20.
Does not flow out of the heat exchanger 8 for the heat source by the solution liquid column, and therefore, when the pressure of the vapor accumulated in the pipe reaches the saturation pressure, no further evaporation occurs thereafter,
Since the solution in the heat exchanger 8 for the heat source is not concentrated,
Crystallization can be prevented in advance.

Next, another embodiment of the first invention will be described with reference to FIG. FIG. 2 is a system diagram showing another example of a refrigeration cycle of a general exhaust heat input type absorption refrigerator. In the figure, the parts designated by the same reference numerals as those in FIG. 1 are equivalent parts. The example shown in FIG. 2 differs from the example in FIG. 1 in the method of circulating the lithium bromide aqueous solution. That is, the dilute solution diluted in the absorber 5 is entirely passed through the low temperature solution heat exchanger 17, the heat source heat exchanger 8 and the high temperature solution heat exchanger 18 by the solution pump 7 provided in the dilute solution pipe 14. After being guided to the high temperature regenerator 9 and concentrated, it is sent to the low temperature regenerator 10 via the high temperature solution heat exchanger 18 and further concentrated.
After passing through the low temperature solution heat exchanger 17, it is sprayed onto the absorber heat transfer tube 6 in the absorber 5 by the concentrated solution pipe 15. The function of each part and the configuration and operation of the characteristic part of the invention are the same as those described with reference to FIG.

Next, an embodiment of the second invention will be described with reference to FIG. FIG. 3 is a system diagram of a refrigeration cycle of the exhaust heat input type absorption refrigeration machine similar to FIG. In the figure, the parts designated by the same reference numerals as those in FIG. 1 indicate the same parts, and the functions of the respective parts are the same as those explained in FIG. The characteristic part of the second invention is that the paths of the dilute solution pipes 21 and 22 connected to the heat exchanger 8 for the heat source in FIG. 3 are formed in a U shape. The operation of the embodiment having such a configuration will be described.
Similar to the embodiment shown in FIG. 1, the heat exchanger 8 for the heat source
When water vapor is generated, the diluted solution pipes 21 and 22 serve as a liquid seal, and the generated water vapor does not flow out from the heat source heat exchanger 8. Therefore, since the solution in the heat exchanger 8 for the heat source is not concentrated, crystallization can be prevented in advance.

Next, another embodiment of the second invention will be described with reference to FIG. FIG. 4 is a system diagram of a refrigeration cycle of the exhaust heat input type absorption refrigerator similar to FIG. In the figure, the parts designated by the same reference numerals as those in FIG. 2 indicate the same parts, and the operation of each part is the same as that of the description of FIG. The configuration and operation of the characteristic part of the invention are the same as those described with reference to FIG.

Next, an embodiment of the third invention will be described with reference to FIG. FIG. 5 is a system diagram of a refrigeration cycle of an exhaust heat input type absorption refrigerator similar to that in FIG. In the figure, the parts designated by the same reference numerals as those in FIG. 1 indicate the same parts, and the functions of the respective parts are the same as those explained in FIG. The characteristic part of the third invention is shown in FIG.
In the above, the heat exchanger 8 for the heat source is integrally formed with the low temperature solution heat exchanger 17 and the high temperature solution heat exchanger 18, and is provided at a position higher than them. The operation of the embodiment having such a configuration will be described. Similar to the embodiment of FIG. 1, when steam is generated in the heat source heat exchanger 8, the low temperature solution heat exchanger 17 and the high temperature solution heat exchanger 18
As a liquid seal, the generated steam does not flow out from the heat source heat exchanger 8. Therefore, since the solution in the heat exchanger 8 for the heat source is not concentrated, crystallization can be prevented in advance.

Next, another embodiment of the third invention will be described with reference to FIG. FIG. 6 is a system diagram of a refrigeration cycle of the exhaust heat input type absorption refrigeration machine similar to FIG. In the figure, the parts designated by the same reference numerals as those in FIG. 2 indicate the same parts, and the operation of each part is the same as that of the description of FIG. The configuration and operation of the characteristic part of the invention are the same as those described with reference to FIG.

[0018]

Since the absorption refrigerator of the present invention can prevent the concentration of the solution with a simple piping structure, the solute can be prevented from crystallizing in advance.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the first invention.

FIG. 2 is a diagram illustrating another embodiment of the first invention.

FIG. 3 is a diagram illustrating one embodiment of the second invention.

FIG. 4 is a diagram for explaining another embodiment of the second invention.

FIG. 5 is a diagram illustrating an embodiment of a third invention.

FIG. 6 is a diagram for explaining another embodiment of the third invention.

FIG. 6 is a diagram for explaining another embodiment of the third invention.

FIG. 7 is a diagram illustrating one embodiment described in the previous patent application.

[Explanation of symbols]

 1 Evaporator 3 Refrigerant Pump 5 Absorber 7 Solution Pump 8 Heat Exchanger for Heat Source 9 High Temperature Regenerator 10 Low Temperature Regenerator 12 Condenser 17 Low Temperature Solution Heat Exchanger 18 High Temperature Solution Heat Exchanger 19, 20, 21, 22 Rare Solution piping

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[Procedure amendment]

[Submission date] July 16, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the first invention.

FIG. 2 is a diagram illustrating another embodiment of the first invention.

FIG. 3 is a diagram illustrating one embodiment of the second invention.

FIG. 4 is a diagram for explaining another embodiment of the second invention.

FIG. 5 is a diagram illustrating an embodiment of a third invention.

FIG. 6 is a diagram for explaining another embodiment of the third invention.

FIG. 7 is a diagram illustrating one embodiment described in the previous patent application.

[Explanation of Codes] 1 Evaporator 3 Refrigerant Pump 5 Absorber 7 Solution Pump 8 Heat Exchanger for Heat Source 9 High Temperature Regenerator 10 Low Temperature Regenerator 12 Condenser 17 Low Temperature Solution Heat Exchanger 18 High Temperature Solution Heat Exchanger 19, 20 , 21, 22 Dilute solution piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yumi Takeuchi 2-425-702 Mitsuhashi, Omiya City, Saitama Prefecture (72) Inventor Masahiro Oka 7-14-7 Minamikoiwa, Edogawa-ku, Tokyo (72) Inventor Katsuji Edera Tokyo 7-10-4-209 Hanabata, Adachi-ku, Tokyo

Claims (9)

[Claims] An evaporator, an absorber, a condenser, a high-temperature regenerator,
A low temperature regenerator, a high temperature solution heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these, and the high temperature solution heat exchanger and the low temperature solution heat exchanger. The heat exchanger for the heat source for exchanging heat between the fluid supplied from the heat source outside the absorption refrigerator and the dilute solution flowing through the dilute solution line is provided in the dilute solution line of the absorbent containing In the absorption refrigerating machine, the paths of the inlet side and outlet side dilute solution pipes connected to the heat exchanger for the heat source are formed below the heat exchanger for the heat source. Absorption refrigerator. 2. The dilute solution is sent by a solution pump through a low temperature solution heat exchanger and a heat exchanger for a heat source, a part through a high temperature solution heat exchanger to a high temperature regenerator, and the rest to a low temperature regenerator. The absorption refrigerator according to claim 1, wherein 3. The absorption refrigerator according to claim 1, wherein the entire amount of the dilute solution sent by the solution pump through the low temperature solution heat exchanger and the heat source heat exchanger is sent to the high temperature regenerator. 4. An evaporator, an absorber, a condenser, a high temperature regenerator,
A low temperature regenerator, a high temperature solution heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these, and the high temperature solution heat exchanger and the low temperature solution heat exchanger. The heat exchanger for the heat source for exchanging heat between the fluid supplied from the heat source outside the absorption refrigerator and the dilute solution flowing through the dilute solution line is provided in the dilute solution line of the absorbent containing In the absorption refrigerating machine, the path of the inlet side and outlet side dilute solution pipes connected to the heat exchanger for the heat source is formed in a U shape. 5. The dilute solution is sent by a solution pump through a low temperature solution heat exchanger and a heat source heat source heat exchanger, partly through a high temperature solution heat exchanger to a high temperature regenerator, and the rest to a low temperature regenerator. The absorption refrigerator according to claim 4, wherein 6. The absorption refrigerator according to claim 4, wherein the entire amount of the dilute solution sent by the solution pump through the low temperature solution heat exchanger and the heat source heat exchanger is sent to the high temperature regenerator. 7. An evaporator, an absorber, a condenser, a high temperature regenerator,
A low temperature regenerator, a high temperature solution heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these, and the high temperature solution heat exchanger and the low temperature solution heat exchanger. The heat exchanger for the heat source for exchanging heat between the fluid supplied from the heat source outside the absorption refrigerator and the dilute solution flowing through the dilute solution line is provided in the dilute solution line of the absorbent containing In the absorption refrigerator, the heat source heat exchanger, the high temperature solution heat exchanger and the low temperature solution heat exchanger are integrally formed, and the heat source heat exchanger is the high temperature solution heat exchanger. An absorption refrigerator having a higher position than the low temperature solution heat exchanger. 8. A dilute solution is fed by a solution pump through a low temperature solution heat exchanger and a heat source heat exchanger, part of which goes through a high temperature solution heat exchanger to a high temperature regenerator, and the rest is sent to a low temperature regenerator. The absorption refrigerator according to claim 7, wherein 9. The absorption refrigerator according to claim 7, wherein the entire amount of the dilute solution sent by the solution pump via the low temperature solution heat exchanger and the heat source heat exchanger is sent to the high temperature regenerator.