JPH06265235A - Absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To enable operating a device referred to above even in the case where the heating capacity of the heating means for heating the solution in a generator is liable to change or the heating capacity is low at all times and make it unnecessary to take measures for preventing crystallization of lithium bromide even where an aqueous solution of lithium bromide is in use for the solution. CONSTITUTION:In a high-temperature generator 30, there are provided a pool of solution into which a dilute solution channel 26 conveys a dilute solution and a heat-transfer tube by which the dilute solution in the pool of solution is heated. High-temperature vapor, which has absorbed heat discharged from a fuel cell (not shown in diagram), is sent into the heat-transfer tube to heat the dilute solution to boil and make it generate refrigerant vapor. The boiling solution overflows a weir marking a specified liquid level and, as a solution of intermediate strength, falls into a channel for a solution of intermediate strength placed under the pool of solution; from this channel the solution flows into a high-temperature heat exchanger 8 through a conveyance line 7 for solution of intermediate strength. Thus the generation of refrigerant vapor and the separation of the refrigerant vapor from the solution of intermediate strength can be effected without using a conventional liquid-lifting tube and a separator.

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 which can be driven even when the heating capacity of a heating means for heating a solution in a high temperature regenerator is low or fluctuates.

[0002]

2. Description of the Related Art A heat source for heating a solution in an absorption refrigerator may be supplied by a cogeneration system or the like. That is, there is a case where power is generated by the fuel cell and the exhaust heat generated at that time is used to heat the solution of the absorption refrigerator.

An outline of an example of the structure of a conventional absorption refrigerator using such a cogeneration system will be described below with reference to FIG. In the following example, a double-effect absorption refrigerating machine equipped with a low temperature regenerator, a high temperature heat exchanger, a low temperature heat exchanger and the like will be described. FIG. 7 is a system diagram of an example of a double-effect absorption chiller used for air conditioning using a cogeneration system. The flows of the solution, the refrigerant vapor, the cold / hot water, the cooling water, and the heat medium are indicated by arrows in the figure. In the figure, the high temperature regenerator 1 has a heat transfer tube 2 housed therein, and the heat transfer tube 2 contains a heat medium (usually high temperature steam) that has absorbed exhaust heat discharged from a fuel cell (not shown) or the like. The diluted solution, which is introduced from the inlet 3 and has a reduced concentration by absorbing the refrigerant, is heated by the heat of the heat medium and boiled. The boiling rare solution becomes a rare solution while generating a refrigerant vapor and rises in the pumping pipe 4, and the refrigerant vapor and the intermediate concentrated solution that has become thicker due to the refrigerant vapor are separated by the separator 5. The refrigerant vapor is sent to the low temperature regenerator 6 via the refrigerant vapor conduit 25, and the intermediate concentrated solution is converted into the intermediate concentrated solution conduit 7.
To the high temperature heat exchanger 8 via. The low temperature regenerator 6 reheats the intermediate concentrated solution whose temperature has been lowered by the high temperature heat exchanger 8 with the refrigerant vapor sent from the high temperature regenerator 1 to generate further refrigerant vapor from the intermediate concentrated solution. The refrigerant is sent to the condenser 9 adjacent to the low-temperature regenerator 6, and the intermediate concentrated solution itself is made into a concentrated solution, and the refrigerant vapor coming from the high-temperature regenerator 1 is partially condensed to be a refrigerant liquid and sent to the condenser 9. The condenser 9 includes the refrigerant vapor generated in the low temperature regenerator 6 and the low temperature regenerator 6.
Refrigerant vapor that has not become the refrigerant liquid in 1. is cooled and liquefied by using cooling water to be a refrigerant liquid and sent to the evaporator 10. Reference numeral 11 is a cooling water inlet for guiding cooling water from a cooling tower (not shown).
Reference numeral 2 is a cooling water outlet for returning the cooling water to a cooling tower (not shown). Inside the evaporator 10, a heat transfer tube (cooler) 13 through which cold / hot water to be cooled flows is arranged, and the heat transfer tube 13 is connected from the condenser 9 to the heat transfer tube 13.
The refrigerant liquid sent to is sprayed using a sprayer (not shown), and the cold / hot water is cooled into cold water by utilizing the heat of vaporization when the refrigerant liquid becomes refrigerant vapor. Reference numeral 14 is a cold / hot water inlet for introducing the cold / hot water into the double-effect absorption refrigerator, and 15 is a cold water outlet for taking out the cold / hot water after cooling or heating from the double-effect absorption refrigerator. In the absorber 16, the concentrated solution that has passed through the low temperature heat exchanger 17 from the low temperature regenerator 6 is introduced, and the concentrated solution is sprayed and dropped by using a sprayer (not shown) provided in the upper part.
This concentrated solution absorbs the vaporized refrigerant vapor in the evaporator 10. Due to this absorbing action of the absorber 16, a high vacuum is secured inside the evaporator 10, and the refrigerant liquid sprinkled on the heat transfer tubes 13 inside the evaporator 10 can be immediately evaporated. Further, the absorber 16 is provided with cooling means 24 for cooling when the concentrated solution absorbs the refrigerant vapor and becomes a diluted solution. The cooling means 24 is composed of a coiled pipe, into which cooling water is introduced. The cooling means 24 is also connected to the cooling means 18 in the condenser 9.
The high temperature heat exchanger 8 performs heat exchange between the high temperature intermediate concentrated solution and the low temperature diluted solution, and the low temperature heat exchanger 17 performs heat exchange between the high temperature concentrated solution and the low temperature diluted solution. Two stages are provided on the high temperature side and the low temperature side to improve the heat exchange efficiency. The solution circulation pump 19 absorbs the refrigerant vapor in the absorber 16 to form a diluted solution, and sends the diluted solution to the high temperature regenerator 1 through the low temperature heat exchanger 17 and the high temperature heat exchanger 8 and the diluted solution conduit 26. , Provided for recirculation. The heat medium that has passed through the high temperature regenerator 1 is guided to the exhaust heat exchanger 20 via the heat medium conduit 22, and within the heat exchanger 20, the heat medium and the dilute solution after passing through the low temperature heat exchanger 17 are obtained. Heat is exchanged between the two to heat the dilute solution, and the heat mediated by the heat medium is effectively used. The diluted solution that has passed through the exhaust heat exchanger 20 is discharged from the heat medium outlet 21. Steam trap 22
Eliminates condensed water generated by condensation of the heat medium (high temperature steam) in the heat medium conduit 23.

The heat medium that has been deprived of heat and condensed (drain after condensation of high-temperature steam) is discharged from the heat medium outlet 21,
Although it is sent to a drain recovery tank (not shown), if the height of the drain return pipe (not shown) that guides the drain to this drain recovery tank becomes high, the double-effect absorption refrigerator in the drain return pipe and the drain (not shown) A drain tank (not shown) for temporarily storing drain is provided between the recovery tank and the drain, and a drain recovery pump (not shown) is provided at the outlet of the drain tank.

During the heating operation, a high-temperature refrigerant vapor from the high-temperature regenerator 1 is directly introduced into the evaporator 10 by a heating / cooling switching valve (not shown), and heat is exchanged with the cold / hot water by the heat transfer pipe 13 to replace the cold water. Get warm water.

[0006]

For example, the conventional absorption refrigerator as described above is provided with the solution pipe 4 and the separator 5 as described above. Therefore, in order to boil the solution in the high-temperature regenerator 1 to raise the solution pipe 4 and guide it to the separator 5, it is necessary to give a certain amount of thermal energy to the solution to boil it.

However, for example, when the solution is heated by the exhaust heat of the fuel cell or the like by the above-mentioned cogeneration system, the electric power load of the fuel cell may fluctuate. Thermal energy can also fluctuate. Therefore, in order to sufficiently heat the solution in the high temperature regenerator 1, the heat quantity of the heat medium is insufficient (in the above example, the vapor pressure of the high temperature steam is insufficient), and the operation of the absorption chiller becomes impossible. In some cases, an aqueous solution of lithium bromide is generally used as the above-mentioned solution, and some means for preventing the crystallization of this lithium bromide is required.

When the heating capacity of the heating means for heating the solution in the high temperature regenerator 1 is always low, the absorption refrigerator cannot be operated at all.

The present invention can be driven even when the heating capacity of the heating means for heating the solution in the regenerator varies, or even when the constant heating capacity is low, and an aqueous solution of lithium bromide is added to the solution. It is an object of the present invention to provide an absorption refrigerator that does not require any means for preventing crystallization of lithium bromide even when used.

[0010]

Means for Solving the Problems The gist of the present invention for solving the above problems is to have a solution reservoir for accumulating a solution and heating means for heating a solution in the solution reservoir, and to heat the solution by the heating. Heat exchange between the regenerator that causes the concentrated solution by boiling to generate the refrigerant vapor and overflows from the specified liquid surface, and the overflowed solution and the dilute solution introduced from the absorber side. And an absorption chiller equipped with a heat exchanger.

The gist of the absorption refrigerator is that the regenerator is arranged at a position higher than the heat exchanger.

[0012]

According to the above means, the solution in the solution reservoir is heated by the heating means, the solution is boiled to generate the refrigerant vapor, and the concentrated solution is overflowed from the specified liquid surface, Even if a conventional pumping pipe or separator is not provided, the solution can be boiled and the refrigerant vapor and the concentrated solution can be generated and separated. Moreover, when the solution boils, it overflows beyond the specified liquid level. As described above, if the solution does not need to be raised through the lift pipe and only the solution is boiled, a large amount of energy is not required. Therefore, the heating means does not require a large amount of heat energy as in the prior art in order to boil the solution to generate and separate the refrigerant vapor and the concentrated solution, respectively. Further, even with such a small amount of heat energy, it is not necessary to take measures to prevent crystallization of lithium bromide even if an aqueous lithium bromide solution is used as a solution.

Further, conventionally, the regenerator has been arranged at a relatively lower part of the entire apparatus of the absorption refrigerating machine, but the regenerator has been introduced from the solution overflowed by the regenerator and the absorber side. If it is placed at a position higher than the heat exchanger for exchanging heat with the dilute solution, even if the regenerator of the present invention is used by eliminating the solution pipe, the solution having a high concentration after separation is A solution such as a pump for guiding to a heat exchanger (for example, when the present invention is applied to a double-effect absorption refrigerator, this heat exchanger is generally a high temperature heat exchanger). It is not necessary to provide means for delivery.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a double-effect absorption refrigerator according to an embodiment of the present invention. Members having the same reference numerals as in FIG.
It is a member having the same function as that of the conventional double-effect absorption refrigerator described with reference to FIG.

The high temperature regenerator 30 of this embodiment is arranged at the highest position among the heat exchangers such as the low temperature regenerator 6 and the condenser 9. FIG. 2 shows an example of arrangement of the heat exchangers of the double-effect absorption refrigerator according to the embodiment of the present invention. In the figure, the heat exchangers such as the high temperature regenerator 30 and the low temperature regenerator 6 are shown in a sectional structure.

The structure of the high temperature regenerator 30 will be described with reference to FIGS. FIG. 3 is a cross-sectional view of the high temperature regenerator 30. The high temperature regenerator 30 includes a solution reservoir 31 into which the dilute solution introduced by the dilute solution conduit 26 is introduced, a heat transfer pipe 32 arranged in the solution reservoir 31, solution banks 38 and 39, an intermediate concentrated solution flow path 34, and the like. Is equipped with. FIG. 4 is a diagram showing the arrangement of the solution reservoir 31, the heat transfer tube 32, and the like. Figure 5 shows the solution reservoir 3
1 is a diagram showing a configuration of an intermediate concentrated solution flow path 34 and the like. The heat transfer tube 32 is formed in a coil shape, and the heat medium (high temperature steam) introduced from the heat medium inlet 3 is introduced from the heat medium intake 36. The heat transfer tube 32 is supported by a support body 35. In addition, the bottom plate 4 of the solution reservoir 31
The space between the heat transfer tube 32 and the heat transfer tube 32 is formed to be relatively narrow as compared with the conventional high temperature regenerator, so that the amount of the solution accumulated at the bottom of the solution reservoir 31 does not increase. The high temperature steam introduced into the heat transfer tube 32 and the dilute solution exchange heat with each other, so that the dilute solution is heated. The heated dilute solution boils to generate a refrigerant vapor, and the boiled solution overflows from the prescribed liquid surface of the dilute solution by the solution banks 38 and 39, and the intermediate concentrated solution flow arranged in the lower part of the solution reservoir 31. Run down to line 34 as an intermediate concentrated solution. 35 is a solution reservoir 31 side and an intermediate concentrated solution flow path 34
It is an opening that connects with.

The high-temperature steam that has passed through the heat transfer tube 32 is discharged from the heat medium outlet 33 and introduced into the exhaust heat exchanger 20 via the heat medium conduit 23.

A steam introducing box 40 is provided above the opening 35.
A baffle plate 41 is formed on the lower part of the arrangement.
The refrigerant vapor generated by heating the dilute solution is introduced from the vapor introduction box 40 to the low temperature regenerator 6 via the refrigerant vapor conduit 25. The baffle plate 41 is designed so that an intermediate concentrated solution or a dilute solution does not enter the vapor introducing box 41 side, and its mounting structure is shown in FIG.

Next, the operation of the double-effect absorption refrigerator of this embodiment will be described. The dilute solution is introduced into the solution reservoir 31 via the dilute solution conduit 26 and exchanges heat with the heat medium (high temperature steam) introduced into the heat transfer tube 32 to boil. The refrigerant vapor generated thereby is introduced from the vapor introduction box 40 to the low temperature regenerator 6 via the refrigerant vapor conduit 25. The boiled diluted solution overflows the defined liquid surface by the solution banks 38 and 39, travels along the solution banks 38 and 39, and falls into the intermediate concentrated solution flow path 34 as an intermediate concentrated solution. Since the high temperature regenerator 30 is arranged at a position higher than the high temperature heat exchanger 8, the intermediate concentrated solution in the intermediate concentrated solution flow path 34 is regenerated at a high temperature from the heat medium outlet 37 via the intermediate concentrated solution conduit 7. Run down to vessel 8. Other operations are the same as those of the conventional double-effect absorption refrigerator described with reference to FIG. 7, and the description thereof will be omitted.

According to the double-effect absorption refrigerator of the present embodiment described above, the solution in the boiling solution reservoir 31 is transferred to the heat transfer tube 3
2 is heated by a heat medium flowing in 2 to boil the solution to generate a refrigerant vapor, and the intermediate concentrated solution is overflowed from the specified liquid surface by the solution banks 38, 39, so that the liquid is pumped as in the conventional case. Even without providing a separator or a separator, the solution can be boiled to generate a refrigerant vapor and an intermediate concentrated solution, respectively, for separation. Moreover, when the solution boils, it overflows beyond the specified liquid level. As described above, if the solution does not need to be raised through the lift pipe and only the solution is boiled, a large amount of energy is not required. Therefore, the heat medium introduced into the heat transfer tube 32 does not require a large amount of heat energy as in the prior art in order to boil the solution to generate the refrigerant vapor and the intermediate concentrated solution and separate them. Therefore, even if the electric power load of the fuel cell (not shown) becomes small and the vapor pressure of the high-temperature steam as a heat medium becomes small, the double-effect absorption refrigerator can be driven, and even if an aqueous lithium bromide solution is used as the solution, the It is not necessary to take measures to prevent crystallization of lithium chloride.

Further, conventionally, the high temperature regenerator has been arranged at a relatively lower part of the entire double effect absorption refrigerator, but in this embodiment, the high temperature regenerator 30 is higher than the high temperature heat exchanger 8. Since it is located at a position, even if the high temperature regenerator 30 of this embodiment is used without using the solution pipe, the intermediate concentrated solution after separation is guided to the high temperature heat exchanger 8 by a pump or the like for delivering the solution. It is not necessary to provide the means of.

Further, since the high temperature regenerator 30 is disposed at a higher position than the low temperature regenerator 6 and the like, the heat medium discharged from the heat medium outlet 21 (the drain after the high temperature steam condensation) is sent to a drain recovery tank (not shown). In many cases, it is not necessary to provide a drain recovery pump or the like (not shown).

In addition, the bottom plate 42 of the solution reservoir 31 and the heat transfer tube 3
The space between the high temperature regenerator 30 and the space between the second high temperature regenerator 30 and the conventional high temperature regenerator is formed to be relatively narrow so that the amount of the solution remaining at the bottom of the solution reservoir 31 does not increase. It is possible to increase the heat input efficiency of the heat medium into the regenerator 30 and the heat exchange efficiency required from the amount of refrigerant vapor generated in the high temperature regenerator 30) by about 10% compared to the conventional high temperature regenerator.

[0024]

According to the absorption refrigerating machine of the present invention described above, the heating means for heating the solution causes the solution to boil to generate and separate the refrigerant vapor and the concentrated solution respectively. Moreover, it does not require as much heat energy as in the past. Therefore, it is possible to provide an absorption chiller that can be driven even when the heating capacity of the heating means may fluctuate or when the constant heating capacity is low.

Further, even with such a small amount of heat energy, even if an aqueous solution of lithium bromide is used as a solution, it is not necessary to take measures to prevent crystallization of lithium bromide.

Further, if the regenerator is arranged at a position higher than the heat exchanger for exchanging heat between the solution overflowing in the regenerator and the dilute solution introduced from the absorber side, the solution pipe Even if the regenerator of the present invention is abolished and the concentrated solution after separation is applied to the heat exchanger (for example, when the present invention is applied to a double-effect absorption refrigerator, The heat exchanger is generally a high temperature heat exchanger.) It is not necessary to provide means for delivering the solution such as a pump in order to lead to the high temperature heat exchanger.

[Brief description of drawings]

FIG. 1 is a system diagram of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of arrangement of heat exchangers of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 3 is a sectional view of a high temperature regenerator of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 4 is a diagram showing an arrangement of a solution reservoir, a heat exchanger and the like of a high temperature regenerator of a double effect absorption refrigerator according to an embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a solution reservoir, an intermediate concentrated solution flow path and the like of a high temperature regenerator of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 6 is a view showing a structure for mounting a baffle plate of a high temperature regenerator of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 7 is a system diagram illustrating a structure of an example of a conventional double-effect absorption refrigerator.

[Explanation of symbols]

 30 high temperature regenerator 31 solution reservoir 32 heat transfer tube 38 solution bank 39 solution bank

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[Procedure amendment]

[Submission date] July 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine which can be driven even when the heating capacity of a heating means for heating a solution in a high temperature regenerator is low or fluctuates.

[0002]

2. Description of the Related Art A heat source for heating a solution in an absorption refrigerator may be supplied by a cogeneration system or the like. That is, there is a case where power is generated by the fuel cell and the exhaust heat generated at that time is used to heat the solution of the absorption refrigerator.

An outline of an example of the structure of a conventional absorption refrigerator using such a cogeneration system will be described below with reference to FIG. In the following example, a double-effect absorption refrigerating machine equipped with a low temperature regenerator, a high temperature heat exchanger, a low temperature heat exchanger and the like will be described. FIG. 7 is a system diagram of an example of a double-effect absorption chiller used for air conditioning using a cogeneration system. The flows of the solution, the refrigerant vapor, the cold / hot water, the cooling water, and the heat medium are indicated by arrows in the figure. In the figure, the high temperature regenerator 1 has a heat transfer tube 2 housed therein, and the heat transfer tube 2 contains a heat medium (usually high temperature steam) that has absorbed exhaust heat discharged from a fuel cell (not shown) or the like. The diluted solution, which is introduced from the inlet 3 and has a reduced concentration by absorbing the refrigerant, is heated by the heat of the heat medium and boiled. The boiling rare solution becomes a rare solution while generating a refrigerant vapor and rises in the pumping pipe 4, and the refrigerant vapor and the intermediate concentrated solution that has become thicker due to the refrigerant vapor are separated by the separator 5. The refrigerant vapor is sent to the low temperature regenerator 6 via the refrigerant vapor conduit 25, and the intermediate concentrated solution is converted into the intermediate concentrated solution conduit 7.
To the high temperature heat exchanger 8 via. The low temperature regenerator 6 reheats the intermediate concentrated solution whose temperature has been lowered by the high temperature heat exchanger 8 with the refrigerant vapor sent from the high temperature regenerator 1 to generate further refrigerant vapor from the intermediate concentrated solution. The refrigerant is sent to the condenser 9 adjacent to the low-temperature regenerator 6, and the intermediate concentrated solution itself is made into a concentrated solution, and the refrigerant vapor coming from the high-temperature regenerator 1 is partially condensed to be a refrigerant liquid and sent to the condenser 9. The condenser 9 includes the refrigerant vapor generated in the low temperature regenerator 6 and the low temperature regenerator 6.
Refrigerant vapor that has not become the refrigerant liquid in 1. is cooled and liquefied by using cooling water to be a refrigerant liquid and sent to the evaporator 10. Reference numeral 11 is a cooling water inlet for guiding cooling water from a cooling tower (not shown).
Reference numeral 2 is a cooling water outlet for returning the cooling water to a cooling tower (not shown). Inside the evaporator 10, a heat transfer tube (cooler) 13 through which cold / hot water to be cooled flows is arranged, and the heat transfer tube 13 is connected from the condenser 9 to the heat transfer tube 13.
The refrigerant liquid sent to is sprayed using a sprayer (not shown), and the cold / hot water is cooled into cold water by utilizing the heat of vaporization when the refrigerant liquid becomes refrigerant vapor. Reference numeral 14 is a cold / hot water inlet for introducing the cold / hot water into the double-effect absorption refrigerator, and 15 is a cold water outlet for taking out the cold / hot water after cooling or heating from the double-effect absorption refrigerator. In the absorber 16, the concentrated solution that has passed through the low temperature heat exchanger 17 from the low temperature regenerator 6 is introduced, and the concentrated solution is sprayed and dropped by using a sprayer (not shown) provided in the upper part.
This concentrated solution absorbs the vaporized refrigerant vapor in the evaporator 10. Due to this absorbing action of the absorber 16, a high vacuum is secured inside the evaporator 10, and the refrigerant liquid sprinkled on the heat transfer tubes 13 inside the evaporator 10 can be immediately evaporated. Further, the absorber 16 is provided with cooling means 24 for cooling when the concentrated solution absorbs the refrigerant vapor and becomes a diluted solution. The cooling means 24 is composed of a coiled pipe, into which cooling water is introduced. The cooling means 24 is also connected to the cooling means 18 in the condenser 9.
The high temperature heat exchanger 8 performs heat exchange between the high temperature intermediate concentrated solution and the low temperature diluted solution, and the low temperature heat exchanger 17 performs heat exchange between the high temperature concentrated solution and the low temperature diluted solution. Two stages are provided on the high temperature side and the low temperature side to improve the heat exchange efficiency. The solution circulation pump 19 absorbs the refrigerant vapor in the absorber 16 to form a diluted solution, and sends the diluted solution to the high temperature regenerator 1 through the low temperature heat exchanger 17 and the high temperature heat exchanger 8 and the diluted solution conduit 26. , Provided for recirculation. The heat medium that has passed through the high temperature regenerator 1 is guided to the exhaust heat exchanger 20 via the heat medium conduit 22, and within the heat exchanger 20, the heat medium and the dilute solution after passing through the low temperature heat exchanger 17 are obtained. Heat is exchanged between the two to heat the dilute solution, and the heat mediated by the heat medium is effectively used. The diluted solution that has passed through the exhaust heat exchanger 20 is discharged from the heat medium outlet 21. Steam trap 22
Eliminates condensed water generated by condensation of the heat medium (high temperature steam) in the heat medium conduit 23.

The heat medium that has been deprived of heat and condensed (drain after condensation of high-temperature steam) is discharged from the heat medium outlet 21,
Although it is sent to a drain recovery tank (not shown), if the height of the drain return pipe (not shown) that guides the drain to this drain recovery tank becomes high, the double-effect absorption refrigerator in the drain return pipe and the drain (not shown) A drain tank (not shown) for temporarily storing drain is provided between the recovery tank and the drain, and a drain recovery pump (not shown) is provided at the outlet of the drain tank.

During the heating operation, a high-temperature refrigerant vapor from the high-temperature regenerator 1 is directly introduced into the evaporator 10 by a heating / cooling switching valve (not shown), and heat is exchanged with the cold / hot water by the heat transfer pipe 13 to replace the cold water. Get warm water.

[0006]

For example, the conventional absorption refrigerator as described above is provided with the solution pipe 4 and the separator 5 as described above. Therefore, in order to boil the solution in the high-temperature regenerator 1 to raise the solution pipe 4 and guide it to the separator 5, it is necessary to give a certain amount of thermal energy to the solution to boil it.

However, for example, when the solution is heated by the exhaust heat of the fuel cell or the like by the above-mentioned cogeneration system, the electric power load of the fuel cell may fluctuate. Thermal energy can also fluctuate. Therefore, in order to sufficiently heat the solution in the high temperature regenerator 1, the heat quantity of the heat medium is insufficient (in the above example, the vapor pressure of the high temperature steam is insufficient), and the operation of the absorption chiller becomes impossible. In some cases, an aqueous solution of lithium bromide is generally used as the above-mentioned solution, and some means for preventing the crystallization of this lithium bromide is required.

When the heating capacity of the heating means for heating the solution in the high temperature regenerator 1 is always low, the absorption refrigerator cannot be operated at all.

The present invention can be driven even when the heating capacity of the heating means for heating the solution in the regenerator varies, or even when the constant heating capacity is low, and an aqueous solution of lithium bromide is added to the solution. It is an object of the present invention to provide an absorption refrigerator that does not require any means for preventing crystallization of lithium bromide even when used.

[0010]

Means for Solving the Problems The gist of the present invention for solving the above problems is to have a solution reservoir for accumulating a solution and heating means for heating a solution in the solution reservoir, and to heat the solution by the heating. Heat exchange between the regenerator that causes the concentrated solution by boiling to generate the refrigerant vapor and overflows from the specified liquid surface, and the overflowed solution and the dilute solution introduced from the absorber side. And an absorption chiller equipped with a heat exchanger.

The gist of the absorption refrigerator is that the regenerator is arranged at a position higher than the heat exchanger.

[0012]

According to the above means, the solution in the solution reservoir is heated by the heating means, the solution is boiled to generate the refrigerant vapor, and the concentrated solution is overflowed from the specified liquid surface, Even if a conventional pumping pipe or separator is not provided, the solution can be boiled and the refrigerant vapor and the concentrated solution can be generated and separated. Moreover, when the solution boils, it overflows beyond the specified liquid level. As described above, if the solution does not need to be raised through the lift pipe and only the solution is boiled, a large amount of energy is not required. Therefore, the heating means does not require a large amount of heat energy as in the prior art in order to boil the solution to generate and separate the refrigerant vapor and the concentrated solution, respectively. Further, even with such a small amount of heat energy, it is not necessary to take measures to prevent crystallization of lithium bromide even if an aqueous lithium bromide solution is used as a solution.

Further, conventionally, the regenerator has been arranged at a relatively lower part of the entire apparatus of the absorption refrigerating machine, but the regenerator has been introduced from the solution overflowed by the regenerator and the absorber side. If it is placed at a position higher than the heat exchanger for exchanging heat with the dilute solution, even if the regenerator of the present invention is used by eliminating the solution pipe, the solution having a high concentration after separation is A solution such as a pump for guiding to a heat exchanger (for example, when the present invention is applied to a double-effect absorption refrigerator, this heat exchanger is generally a high temperature heat exchanger). It is not necessary to provide means for delivery.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a double-effect absorption refrigerator according to an embodiment of the present invention. Members having the same reference numerals as in FIG.
It is a member having the same function as that of the conventional double-effect absorption refrigerator described with reference to FIG.

The high temperature regenerator 30 of this embodiment is arranged at the highest position among the heat exchangers such as the low temperature regenerator 6 and the condenser 9. FIG. 2 shows an example of arrangement of the heat exchangers of the double-effect absorption refrigerator according to the embodiment of the present invention. In the figure, the heat exchangers such as the high temperature regenerator 30 and the low temperature regenerator 6 are shown in a sectional structure.

The structure of the high temperature regenerator 30 will be described with reference to FIGS. FIG. 3 is a cross-sectional view of the high temperature regenerator 30. The high temperature regenerator 30 includes a solution reservoir 31 into which the dilute solution introduced by the dilute solution conduit 26 is introduced, a heat transfer tube 32 arranged in the solution reservoir 31, solution banks 38, 39, and the like. FIG. 4 is a diagram showing the arrangement of the solution reservoir 31, the heat transfer tube 32, and the like. FIG. 5 is a diagram showing the configuration of the solution reservoir 31, the cavity 34 in the solution bank , and the like. The heat transfer tube 32 is formed in a coil shape, and the heat medium (high temperature steam) introduced from the heat medium inlet 3 is introduced from the heat medium intake 36.
The heat transfer tube 32 is supported by a support body 35. Further, the space between the bottom plate 42 of the solution reservoir 31 and the heat transfer tube 32 is formed to be relatively narrow as compared with the conventional high temperature regenerator so that the amount of the solution retained at the bottom of the solution reservoir 31 does not increase. . The high temperature steam introduced into the heat transfer tube 32 and the dilute solution exchange heat with each other, so that the dilute solution is heated. Heated diluted solution generates a refrigerant vapor by boiling, boiling solvent
The liquid overflows the specified liquid level in front of the intermediate concentrated solution conduit 7.
And flows down into the intermediate concentrated solution conduit 7 as an intermediate concentrated solution.

The high-temperature steam that has passed through the heat transfer tube 32 is discharged from the heat medium outlet 33 and introduced into the exhaust heat exchanger 20 via the heat medium conduit 23.

A steam introduction box 40 is arranged above the high temperature regenerator 30 , and a baffle plate 41 is formed below the steam introduction box 40. The refrigerant vapor generated by heating the dilute solution is introduced from the vapor introduction box 40 to the low temperature regenerator 6 via the refrigerant vapor conduit 25. The baffle plate 41 prevents the intermediate concentrated solution and the dilute solution from entering the steam introducing box 41 side.
The mounting structure is shown in FIG.

Next, the operation of the double-effect absorption refrigerator of this embodiment will be described. The dilute solution is introduced into the solution reservoir 31 via the dilute solution conduit 26 and exchanges heat with the heat medium (high temperature steam) introduced into the heat transfer tube 32 to boil. The refrigerant vapor generated thereby is introduced from the vapor introduction box 40 to the low temperature regenerator 6 via the refrigerant vapor conduit 25. The boiling dilute solution overflows the specified liquid surface by the solution banks 38 and 39, travels along the solution banks 38 and 39, and becomes an intermediate concentrated solution, and is a cavity in the solution bank.
Falls to 34 . Other operations are the same as those of the conventional double-effect absorption refrigerator described with reference to FIG. 7, and the description thereof will be omitted.

According to the double-effect absorption refrigerator of the present embodiment described above, the solution in the boiling solution reservoir 31 is transferred to the heat transfer tube 3
2 is heated by a heat medium flowing in 2 to boil the solution to generate refrigerant vapor, and the intermediate concentrated solution is in front of the intermediate concentrated solution conduit 7.
By overflowing from the specified liquid surface , the solution can be boiled and the refrigerant vapor and the intermediate concentrated solution can be generated and separated without the need for a pump or a separator as in the conventional case. Moreover, when the solution boils, it overflows beyond the specified liquid level. As described above, if the solution does not need to be raised through the lift pipe and only the solution is boiled, a large amount of energy is not required. Therefore, the heat medium introduced into the heat transfer tube 32 does not require a large amount of heat energy as in the prior art in order to boil the solution to generate the refrigerant vapor and the intermediate concentrated solution and separate them. Therefore, even if the electric power load of the fuel cell (not shown) becomes small and the vapor pressure of the high-temperature steam as a heat medium becomes small, the double-effect absorption refrigerator can be driven, and even if an aqueous lithium bromide solution is used as the solution, the It is not necessary to take measures to prevent crystallization of lithium chloride.

Further, conventionally, the high temperature regenerator has been arranged at a relatively lower part of the entire double effect absorption refrigerator, but in this embodiment, the high temperature regenerator 30 is higher than the high temperature heat exchanger 8. Since it is located at a position, even if the high temperature regenerator 30 of this embodiment is used without using the solution pipe, the intermediate concentrated solution after separation is guided to the high temperature heat exchanger 8 by a pump or the like for delivering the solution. It is not necessary to provide the means of.

Further, since the high temperature regenerator 30 is disposed at a higher position than the low temperature regenerator 6 and the like, the heat medium discharged from the heat medium outlet 21 (the drain after the high temperature steam condensation) is sent to a drain recovery tank (not shown). In many cases, it is not necessary to provide a drain recovery pump or the like (not shown).

In addition, the bottom plate 42 of the solution reservoir 31 and the heat transfer tube 3
The space between the high temperature regenerator 30 and the space between the second high temperature regenerator 30 and the conventional high temperature regenerator is formed to be relatively narrow so that the amount of the solution remaining at the bottom of the solution reservoir 31 does not increase. It is possible to increase the heat input efficiency of the heat medium into the regenerator 30 and the heat exchange efficiency required from the amount of refrigerant vapor generated in the high temperature regenerator 30) by about 10% compared to the conventional high temperature regenerator.

[0024]

According to the absorption refrigerating machine of the present invention described above, the heating means for heating the solution causes the solution to boil to generate and separate the refrigerant vapor and the concentrated solution respectively. Moreover, it does not require as much heat energy as in the past. Therefore, it is possible to provide an absorption chiller that can be driven even when the heating capacity of the heating means may fluctuate or when the constant heating capacity is low.

Further, even with such a small amount of heat energy, even if an aqueous solution of lithium bromide is used as a solution, it is not necessary to take measures to prevent crystallization of lithium bromide.

Further, if the regenerator is arranged at a position higher than the heat exchanger for exchanging heat between the solution overflowing in the regenerator and the dilute solution introduced from the absorber side, the solution pipe Even if the regenerator of the present invention is abolished and the concentrated solution after separation is applied to the heat exchanger (for example, when the present invention is applied to a double-effect absorption refrigerator, The heat exchanger is generally a high temperature heat exchanger.) It is not necessary to provide means for delivering the solution such as a pump in order to lead to the high temperature heat exchanger.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

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[Correction content]

[Fig. 2]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

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[Figure 3]

Claims (2)

[Claims] 1. A solution containing a solution and a heating means for heating the solution in the solution reservoir, the solution being boiled by the heating to generate a refrigerant vapor, and the concentrated solution is defined. A regenerator for overflowing from the liquid surface, a heat exchanger for exchanging heat between the overflowed solution and the dilute solution introduced from the absorber side, and the overflowed solution from the regenerator. An absorption refrigerator having a solution conduit leading to the heat exchanger. 2. The absorption refrigerator according to claim 1, wherein the regenerator is arranged at a position higher than the heat exchanger.