JP2001174098A - Waste heat absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low temperature refrigeration medium at low running cost and initial cost. SOLUTION: A single effect absorption refrigerating machine is operated using waste heat from the low temperature waste heat source of a gas engine 1 as a heat source. On the other hand, a part of ammonia-aqueous solution fed from a regenerator 8 to an absorber 12 is taken out and steam is generated by waste gas from a high temperature waste heat source. A steam turbine 21 is driven with that steam and a compressor 27 interlocked with the steam turbine 21 is driven. The compressor 27 sucks steam in an evaporator 14 to lower the pressure in the evaporator 14 below the pressure in the absorber 12. As evaporation progresses in the evaporator 14, a low temperature refrigeration medium is taken out through a pipe 34 for taking out refrigeration medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste heat absorption refrigerator configured to recover waste heat generated from a prime mover such as a diesel engine, a Stirling engine, or a Miller cycle gas engine to take out a refrigeration medium.

[0002]

2. Description of the Related Art As a conventional exhaust heat absorption refrigerator, there has been an ammonia absorption refrigerator as shown in a schematic configuration diagram of a conventional example in FIG. According to this conventional example, the gas engine 01
The generator 03 is interlocked via a coupling 02.

[0003] A circulation pipe 0 having a first pump 04 for circulating jacket cooling water interposed between an outlet and an inlet of an engine cooling unit as a low-temperature exhaust heat source of the gas engine 01.
5 is connected to the circulation pipe 05, and a regenerator 06 constituting a single-effect absorption refrigerator is provided. The regenerator 06 has jacket cooling water (temperature 85) from the gas engine 01.
(−95 ° C.) as a non-azeotropic mixed medium containing ammonia evaporable as a refrigerant and water as an absorbent. This jacket cooling water also collects the exhaust heat of the exhaust gas of the gas engine 01 via the exhaust gas heat exchanger.

[0004] A condenser 08 is connected to the regenerator 06 via a rectifier 07 so as to supply ammonia vapor from which water has been separated, and is absorbed by the regenerator 06 via a first pipe 09. The evaporator 012 is connected to the condenser 08 via the second pipe 011, and the absorber 010 and the evaporator 012 are connected to each other to form a single-effect absorption refrigerator. ing.

[0005] In the condenser 08, the ammonia evaporated in the regenerator 06 is condensed and liquefied, and the liquefied ammonia is returned to the evaporator 012 by spray supply. In the evaporator 012, the ammonia evaporates with the absorption of the ammonia by the water in the absorber 010.

[0006] In the regenerator 06 and the absorber 010,
A third pipe 014 having a solution pump 013 interposed therebetween is connected, a heat exchanger 015 is provided between the third pipe 014 and the first pipe 09, and a liquefied ammonia-water system returned to the regenerator 06 is provided. The solution is heated by an ammonia-water solution flowing from the regenerator 06 to the absorber 010.

With the above configuration, the evaporator 0 is cooled by utilizing the jacket cooling water, which is low-temperature exhaust heat from the gas engine 01.
With the evaporation of ammonia at 12, cold water is obtained.

[0008] However, in an absorption refrigerator such as ammonia or LiBr (lithium bromide), the refrigerant circuit forcibly compresses and expands the refrigerant by an electric compressor, because it depends on an absorption process or an evaporation process. The coefficient of performance tends to be lower than that of a refrigerator provided.

For this reason, various methods for increasing the coefficient of performance of an absorption refrigerator have been conventionally studied.
A process has been proposed in which an electric compressor is provided between the evaporator 012 and the absorber 010, the steam in the evaporator 012 is sucked, and the sucked steam is pressurized and supplied to the absorber 010.

According to this configuration, since the pressure in the absorber 010 does not decrease, it is the same as that of the refrigerator having the refrigerant circuit for forcibly compressing and expanding the refrigerant by the electric compressor as described above. Low temperature can be taken out.
In terms of performance, it is possible to increase the coefficient of performance to 1.2 times or more when the electric power used for the electric compressor is excluded. Further, in the conventional method, it is impossible to extract cold heat of −10 ° C. or less by using the temperature of the jacket cooling water level as a heating source on the During diagram, but according to this configuration, it is possible to extract cold heat.

[0011]

However, in the case of an electric compressor, the electric motor and the compressor must be connected to each other, and the bearing of the transmission shaft must be lubricated and sealed against leakage. When applied to an ammonia absorption refrigerator, problems with lubricating oil and leakage, such as adverse effects on heat transfer to the refrigerant, such as evaporation of ammonia when lubricating oil is mixed into the system, hinder development. It was a big factor.

At the same time, there is a problem that the electric power required for driving the electric compressor is large and the running cost is increased. Of course, if only the problem of lubricating oil or leakage is encountered, it is possible to use a sealed canned motor, but there is a drawback that running costs and initial costs increase.

The present invention has been made in view of such circumstances, and an invention according to claim 1 is to provide a medium for refrigeration by lowering both running costs and initial costs. Claim 2
An object of the present invention is to provide an inexpensive and good seal for lubrication and leakage of a bearing portion. The invention according to claims 3 and 4 is intended for cooling from room temperature to a low temperature. The goal is to be able to increase the coefficient of performance. The invention according to claim 5 aims to improve the heat recovery, and the invention according to claim 6 aims to improve the efficiency of exhaust heat recovery from a high-temperature exhaust heat source. Aim.

[0014]

According to the first aspect of the present invention, there is provided an exhaust heat absorption refrigerator for achieving the above object.
A low-temperature heat source that generates heat at a temperature lower than 0 ° C .;
A high-temperature exhaust heat source that generates exhaust heat at a temperature higher than ℃, a single-effect absorption refrigerator including a regenerator (8), an absorber (12), a condenser (10), and an evaporator (14); A circulation pipe (7) connected between the low-temperature exhaust heat source and the regenerator (8) so that the exhaust heat from the low-temperature exhaust heat source is used as a heat source, and a refrigerant evaporable by the exhaust heat from the low-temperature exhaust heat source. A pipe (16) for supplying a non-azeotropic mixed medium containing the mixture from the absorber (12) to the regenerator (8)
A pipe (11) for supplying a non-azeotropic mixed medium from the regenerator (8) to the absorber (12); and a regenerator (8) connected in the middle of the pipe (11) from the absorber. A branch pipe (19) for extracting a part of the non-azeotropic mixed medium supplied to (12), a gas pipe (4) connected to the high-temperature exhaust heat source and for extracting exhaust gas from the high-temperature exhaust heat source, Pipe (4) and the branch pipe (1
9), and a heat exchanger (2) for heating and evaporating the non-azeotropic mixed medium by the exhaust gas from the high-temperature exhaust heat source.
0) and the heat exchanger (2) provided in the branch pipe (19).
The steam turbine (21) driven by the non-azeotropic mixed medium vaporized in (0), a steam path communicating and connecting the evaporator (14) and the absorber (12), and the steam path is provided in the steam path. A compressor (27) integrally and operatively connected to the steam turbine (21) to generate a pressure difference between the evaporator (14) and the absorber (12) by sucking steam in the evaporator (14); Refrigeration medium take-out tube attached to the evaporator (14) to take out refrigeration medium
(34).

[0015] For example, the heat of the exhaust gas is extracted by using a plurality of heat exchangers in a high-temperature section and a low-temperature section to extract exhaust heat at a temperature higher than 130 ° C and exhaust heat at a temperature lower than 130 ° C. When used, they are regarded as a high-temperature exhaust heat source and a low-temperature exhaust heat source, respectively.

Further, in order to achieve the above object, the exhaust heat absorption refrigerator according to the second aspect of the present invention is provided with the compressor (27) and the steam in the exhaust heat absorption refrigerator according to the first aspect of the invention. A transmission shaft (26) that links the turbine (21) and the gas turbine (30)
The gas bearing (30) is connected to a branch pipe (19), and the vapor of the non-azeotropic mixed medium evaporated in the heat exchanger (20) is supplied to the gas bearing (30) for lubrication. It is constituted so that.

In order to achieve the above object, a low-temperature exhaust heat source in the exhaust heat absorption refrigerator according to the first or second aspect of the present invention is provided. And a motor (41) having a high-temperature exhaust heat source, a turbo refrigerator (42) is interlockedly connected to the motor (41), and the object to be cooled after being cooled by the turbo refrigerator (42) is cooled. The cooling medium is cooled by exchanging heat with the freezing medium taken out from the take-out pipe (44).

In order to achieve the above object, a low-temperature exhaust heat source in the exhaust heat absorption refrigerator according to the first or second aspect of the present invention is provided. And a prime mover having a high-temperature exhaust heat source, a generator is interlocked to the prime mover, an electric turbo chiller is connected to a power generation line of the generator, and the object to be cooled after being cooled by the electric turbo chiller is cooled. The cooling medium is cooled by exchanging heat with the freezing medium taken out of the freezing medium take-out tube.

Further, the exhaust heat absorption refrigerator of the invention according to claim 5 has the following features.
The steam path compressor (27) and the absorber (1) in the exhaust heat absorption refrigerator according to any one of claims 2, 3, and 4.
Between 2), by the discharge gas from the compressor (27),
The heat exchanger (25) for heating the non-azeotropic mixed medium supplied from the absorber (12) to the regenerator (8) is provided.

In order to achieve the above object, the exhaust heat absorption refrigerator of the invention according to claim 6 has the following features.
In the exhaust heat absorption refrigerator of the invention according to any one of claims 2, 3, 4, and 5, the exhaust heat pipe from the high temperature exhaust heat source to the exhaust gas pipe passing through the heat exchanger (20) is provided for taking out hot water for hot water supply. The heat exchanger (33) is provided.

As a non-azeotropic mixed medium containing a refrigerant evaporable by the exhaust heat from the low-temperature exhaust heat source, an ammonia-water mixed solution, a methanol-water mixed solution, or the like can be used. The non-azeotropic mixture medium may contain some third components for preventing corrosion, in addition to the refrigerant and the absorbent.

[0022]

According to the configuration of the exhaust heat absorption refrigerator of the first aspect of the present invention, the single-effect absorption refrigerator is operated using the exhaust heat from the low-temperature exhaust heat source as a heat source. On the other hand, the exhaust gas from the high-temperature exhaust heat source is supplied from the regenerator (8) to the absorber (12) at approximately 85 ° C.
A non-azeotropic mixed medium having a relatively high temperature is heated through a heat exchanger (20) to generate steam of the non-azeotropic mixed medium, and the steam drives a steam turbine (21) to produce a steam turbine ( Two
The compressor (27), which is integrally linked to (1), is driven. By this compressor (27), the vapor in the evaporator (14) is sucked to lower the pressure in the evaporator (14) below the pressure in the absorber (12),
Along with the evaporation in the evaporator (14), the medium extraction pipe for freezing (34)
, A low-temperature freezing medium can be taken out.

According to the configuration of the exhaust heat absorption refrigerator of the second aspect of the present invention, the steam of the non-azeotropic mixed medium evaporated in the heat exchanger (20) for operating the steam turbine (21). It supplies itself to the gas bearing (30) as a lubricant, and the gas bearing (3
0) supports a transmission shaft (26) that interlocks the compressor (27) and the steam turbine (21).

According to the third aspect of the present invention, the object to be cooled is cooled by the turbo refrigerator (42) interlocked with the prime mover (41), and the object to be cooled is cooled. ,
Cooling is performed by exchanging heat with a freezing medium obtained by exhaust heat from the prime mover (41).

Further, according to the structure of the exhaust heat absorption refrigerator of the fourth aspect of the present invention, the generator is connected to the prime mover to generate electric power, and the electric motor is cooled by the electric turbo refrigerator driven by the electric power of the generator. The cooled object is cooled, and the object to be cooled is cooled by exchanging heat with a freezing medium obtained by exhaust heat from the prime mover.

According to the structure of the exhaust heat absorption refrigerator of the fifth aspect of the present invention, the exhaust gas discharged from the compressor (27) is supplied from the absorber (12) to the regenerator (8). The non-azeotropic mixture medium is heated.

Further, according to the configuration of the exhaust heat absorption refrigerator of the invention according to claim 6, the exhaust gas heat recovered for generating steam for driving the steam turbine (21) is transferred to the heat exchanger (33). The exhaust gas is supplied, and the sensible heat and latent heat of the exhaust gas are collected for taking out hot water for hot water supply.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first embodiment of a waste heat absorption refrigerator according to the present invention. A generator 3 is interlocked to a gas engine 1 as a prime mover via a coupling 2.

A gas pipe 4 is connected to an exhaust pipe of the gas engine 1 as a high-temperature exhaust heat source.
A denitration device 5 for removing components is provided.

A circulation pipe 7 having a first pump 6 for circulating jacket cooling water is connected between an outlet and an inlet of an engine cooling unit as a low-temperature exhaust heat source of the gas engine 1. A regenerator 8 constituting a single-effect absorption refrigerator is provided. The regenerator 8 contains an ammonia-water-based solution as a non-azeotropic mixed medium using ammonia evaporable by jacket cooling water (temperature 85 to 95 ° C.) from the gas engine 1 as a refrigerant and water as an absorbent. Is housed.

A condenser 10 is connected to the regenerator 8 via an rectifier 9 so as to supply ammonia vapor from which water has been separated, and the regenerator 8 is connected to the absorber 1 via a first pipe 11.
2 is connected, and the second pipe 13 is connected to the condenser 10.
The evaporator 14 is connected to the evaporator 14, and the absorber 12 and the evaporator 14 are connected to each other via a steam path, thereby forming a single-effect absorption refrigerator.

In the condenser 10, the refrigerant evaporated in the regenerator 8 is condensed and liquefied, and the liquefied refrigerant is returned to the evaporator 14 by spray supply. In the evaporator 14, the refrigerant evaporates with the absorption of the refrigerant by the absorbent in the absorber 12.

The first regenerator 8 and the absorber 12
A third pipe 16 having a solution pump 15 interposed therebetween is connected, and a first pipe 11 is provided between the third pipe 16 and the first pipe 11.
Is provided so that the liquefied ammonia-water solution returned to the regenerator 8 is heated by the ammonia-water solution flowing from the regenerator 8 to the absorber 12.

A branch pipe 19 with a second solution pump 18 interposed is connected between the regenerator 8 of the first pipe 11 and the first heat exchanger 17, and the branch pipe 19 and the gas pipe 4 A second heat exchanger 20 is provided between the first and second heat exchangers, and is configured to heat the liquefied ammonia-water solution by heat transfer with the exhaust gas from the gas engine 1 to generate high-temperature and high-pressure steam.

A steam turbine 21 is connected to the branch pipe 19, and the steam turbine 21 and the absorber 12 are connected via a fourth pipe 22, and an ammonia-water system as a working medium of a single-effect absorption refrigerator is used. The steam turbine 21 is driven by the high-temperature and high-pressure steam of the solution, and the steam discharged from the steam turbine 21 is returned to the absorber 12.

In the third pipe 16, a bypass pipe 24 provided with an on-off valve 23 is connected in parallel with the first heat exchanger 17, and a third heat pipe is provided between the bypass pipe 24 and the fourth pipe 22. An exchanger 25 is provided, and the liquefied ammonia-water solution returned to the regenerator 8 is supplied to the steam turbine 21.
Is heated by the vapor of the ammonia-water solution discharged from the heater.

As shown in the sectional view of FIG. 2, a compressor 27 is integrally connected to the steam turbine 21 via a transmission shaft 26, and the steam turbine 21, the transmission shaft 26 and the compressor 2
7 is housed in an integrated casing 29 in a sealed state via a packing 28, and a transmission shaft 26 is rotatably supported via a gas bearing 30.

A fourth heat exchanger 31 is provided in the middle of the second pipe 13, and the fourth heat exchanger 31 and the absorber 1
The compressor 27 described above is provided between the fourth heat exchanger 3 and the second heat exchanger 3.
After passing through 1, it is supplied to the absorber 12.
The steam pipe connecting the evaporator 14 and the absorber 12 is called a steam path.

Downstream of the second heat exchanger 20 of the gas pipe 4, a heat exchanger 33 for taking out hot water for hot water supply is provided across the hot water supply pipe 32, and the second heat exchanger 20 drives the steam turbine 21. The sensible heat and the latent heat are recovered from the exhaust gas after the sensible heat is recovered for the generation of steam for use to obtain hot water for hot water supply.

The evaporator 14 is provided with a refrigerating medium take-out pipe 34 for taking out brine as a refrigerating medium. The heat exchange with the brine cools and freezes the object to be cooled such as food or sewage sludge in the sewage treatment system. A cooling pipe 35 that supplies cooling water from the cooling tower is passed through the condenser 10 and the absorber 12.

The gas bearing 30 is supplied with high-temperature and high-pressure steam generated in the second heat exchanger 20, and is configured to be lubricated by an ammonia-water solution as a working medium of the single-effect absorption refrigerator. I have. The steam from the gas bearing 30 is returned to the absorber 12 through the fourth pipe 22.

In the first embodiment, the ammonia-water solution vapor discharged from the steam turbine 21 is supplied to the absorber 12
But the temperature of the steam is 1
If the temperature exceeds 00 ° C., it may be supplied to the regenerator 8.

In the first embodiment, the gas bearing 30
The high-temperature and high-pressure steam generated in the second heat exchanger 20 is supplied to the first heat exchanger 20. For example, a single-effect absorption refrigeration system such as supplying an ammonia-water solution from the absorber 12 is used. Various configurations can be adopted as long as they are lubricated by an ammonia-water solution as a working medium of the machine.

In the first embodiment, a so-called cogeneration system is described in which the generator 3 is driven by the gas engine 1 to extract electric power. Applicable.

FIG. 3 is a schematic structural view showing the second embodiment. The difference from the first embodiment is as follows. That is, a turbo chiller is used in place of the generator 3, a turbo chiller 42 is connected to the gas engine 41 in an interlocked manner, and a processing medium passage 43 for the object to be cooled passes through the centrifugal chiller 42. It is configured to exchange heat with the refrigeration medium taken out from the take-out pipe 44 to cool the object to be cooled. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

According to the second embodiment, from room temperature to -10.degree.
When cooling to the following low temperature, the centrifugal chiller 4
By effectively utilizing the characteristics of item 2, the coefficient of performance as a whole can be significantly increased. The centrifugal chiller 42 has a very high coefficient of performance in a range from room temperature to about −10 ° C., but when the temperature is lower than that, the coefficient of performance extremely decreases. The cooling at the low temperature is performed by the refrigeration configuration in which the single-effect absorption refrigerator of the present invention is combined with the steam turbine and the compressor, so that the coefficient of performance is not reduced.

As a modification of the second embodiment, a generator is connected to the gas engine 41 so as to use an electric turbo chiller instead of the centrifugal chiller 42, and an electric turbo chiller is connected to the power line of the generator. A refrigerator may be connected, and the object to be cooled after being cooled by the electric turbo refrigerator may be cooled by exchanging heat with the freezing medium taken out of the freezing medium take-out pipe.

FIG. 4 is a schematic structural view showing a third embodiment of the exhaust heat absorption refrigerator according to the present invention. The difference from the first embodiment is as follows. That is, the steam path from the compressor 27 is connected to the fourth pipe 22 between the third heat exchanger 24 and the steam turbine 21, and the gas discharged from the compressor 27 causes the regenerator 8 is configured to heat the non-azeotropic mixed medium supplied to the liquid.

In the above embodiment, the regenerator 8 is connected to the absorber 12
Since a part of the ammonia-water-based solution that is the non-azeotropic mixed medium supplied to the tank is taken out and the second heat exchanger 20 is used as an exhaust gas boiler to generate steam, the non-azeotropic mixed medium is removed from the absorber 12. Compared with the case of taking out, a portion where the concentration of the refrigerant with respect to the absorbent, that is, the concentration of ammonia with respect to the water is low can be used, thereby improving Rankine efficiency.

Also, as a result of taking out a part of the ammonia-water-based solution, which is a non-azeotropic mixture medium, on the upstream side supplied to the first heat exchanger 17, the first heat exchanger 17 regenerates from the absorber 12. The amount of heat supplied to the heating of the ammonia-water solution supplied to the vessel 8 is reduced. However,
The temperature of the ammonia-water solution supplied from the regenerator 8 to the absorber 12 is about 85 ° C., which is sufficiently higher than the temperature of the ammonia-water solution supplied from the absorber 12 to the regenerator 8 of about 32 ° C. Since the upward flow supplied from the absorber 12 to the regenerator 8 has a smaller enthalpy head than the downward flow and is controlled by the upward flow, the amount of heat exchange in the first heat exchanger 17 varies. No adverse effect.

As the gas engine 1 of the above embodiment, various gas engines such as a Miller cycle gas engine, a diesel engine and a Stirling engine can be used.

For the sake of simplicity, reference numerals are assigned to constituent members in the claims and in the respective means and means for solving the problems, but the invention is not limited to this. Not a thing.

[0053]

As described above, according to the exhaust heat absorption refrigerator of the first aspect of the present invention, while operating the single-effect absorption refrigerator using the exhaust heat from the low-temperature exhaust heat source as the heat source, the high-temperature exhaust heat source is operated. The steam turbine is driven by the exhaust heat from the compressor to drive the compressor, and the pressure in the evaporator is made lower than the pressure in the absorber to take out the low-temperature refrigeration medium. The refrigeration medium can be taken out by the exhaust heat of the refrigeration medium, and both the running cost and the initial cost can be reduced, and a refrigeration medium at a temperature lower than zero degrees can be obtained. That is, for example, if an electric compressor is used as the above-described compressor, the running cost increases because power is required to drive the compressor. The present invention does not require such driving power. In addition, the steam that drives the steam turbine and the steam that is sucked by the compressor to reduce the pressure in the evaporator to be lower than the pressure in the absorber are both non-common, which are the working medium of the single-effect absorption refrigerator. Since it is the steam of the boiling mixed medium and the bearing can be lubricated with the same medium, the steam turbine, the compressor, and the transmission shaft interconnecting them can be housed in the same casing, and the electric motor and the compressor The initial cost can be reduced as compared with the case where a complicated configuration is adopted for the lubrication of the bearing portion and the seal against the leakage with respect to the transmission shaft for interlocking connection and the use of a sealed canned motor. In addition, since the non-azeotropic mixed medium supplied from the regenerator to the absorber is supplied to the heat exchanger and heat-exchanged with the exhaust gas from the high-temperature exhaust heat source to generate steam for driving the steam turbine, the exhaust gas is exposed. It is possible to generate steam only by heat, and it is not necessary to use expensive materials in order to avoid corrosion damage due to acidic condensed water in a heat exchanger or exhaust gas piping.For example, a non-azeotropic mixed medium from an absorber can be used. There is an advantage that the cost can be reduced as compared with the case where it is used. More specifically, when the temperature of the non-azeotropic mixed medium supplied from the regenerator to the absorber is as high as about 85 ° C., when the non-azeotropic mixed medium from the absorber is used, the non-azeotropic mixed medium is used. Since the temperature is as low as about 32 ° C., a large amount of heat is required to generate steam, and not only sensible heat but also latent heat of exhaust gas from the high-temperature exhaust heat source is consumed. When the exhaust gas is condensed and liquefied, acidic condensed water is generated by sulfurous acid components in the exhaust gas, and the acidic condensed water acts on a heat exchanger or an exhaust gas pipe under high pressure to cause corrosion damage. As a result, a high-grade corrosion-resistant material such as titanium is required in order to prevent rupture or the like due to corrosion damage, which increases the cost.

According to the exhaust heat absorption refrigerator of the second aspect of the present invention, the lubrication of the gas bearing of the transmission shaft for interlocking the steam turbine and the compressor is performed by the non-azeotropic mixed medium for operating the steam turbine. Because the steam itself is used, even if a part of the steam leaks from the bearing, it does not become a foreign matter, eliminating the need for a high seal configuration such as when using lubricating oil, making it easy to lubricate the bearing and seal against leakage. It can be performed favorably at low cost with a simple configuration.

According to the exhaust heat absorption refrigerator of the third aspect of the present invention, for example, cooling from normal temperature to a low temperature of -20 ° C. or less, such as freeze-drying of food or sewage sludge in a sewage treatment system. In the case where the temperature is from room temperature to about -10 ° C or -15 ° C, the object to be cooled is cooled by a turbo refrigerator having a very high coefficient of performance in that range, and in the lower temperature range, it is obtained by exhaust heat from the prime mover. Cool with freezing medium,
When cooling from room temperature to low temperature, the coefficient of performance as a whole can be significantly increased.

According to the exhaust heat absorption refrigerator of the fourth aspect of the present invention, the electric turbo refrigerator is driven by the electric power of the generator interlocked with the prime mover, for example, for refrigeration of food or sewage in a sewage treatment system. When cooling from room temperature to a low temperature of -20 ° C or lower, such as freeze drying of sludge,
Up to about 10 ° C or -15 ° C, the object to be cooled is cooled by an electric turbo chiller with a very high coefficient of performance in that range, and in a lower temperature range, it is cooled by a refrigeration medium obtained by exhaust heat from the prime mover. When cooling from room temperature to low temperature, the coefficient of performance as a whole can be greatly increased.

Further, according to the fifth aspect of the present invention, the exhaust heat of the gas discharged from the compressor is used for heating the non-azeotropic mixed medium supplied from the absorber to the regenerator. Therefore, heat recovery can be performed more favorably.

According to the exhaust heat absorption refrigerator of the present invention, the heat for generating steam for driving the steam turbine is generated from the exhaust gas within the range of the sensible heat of the exhaust gas from the high-temperature exhaust heat source. The recovered exhaust gas is supplied to the heat exchanger, and the sensible heat and latent heat of the exhaust gas are recovered to extract hot water for hot water supply. Therefore, the efficiency of recovering the exhaust heat from the high-temperature exhaust heat source can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a waste heat absorption refrigerator according to the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is a schematic configuration diagram showing a second embodiment.

FIG. 4 is a schematic configuration diagram showing a third embodiment.

FIG. 5 is a schematic configuration diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gas engine as a motor 4 ... Gas pipe 7 ... Circulation pipe 8 ... Regenerator 10 ... Condenser 11 ... 1st pipe 12 ... Absorber 14 ... Evaporator 16 ... 3rd pipe 19 ... Branch pipe 20 ... No. 2 heat exchanger 21 ... steam turbine 25 ... third heat exchanger 26 ... power transmission shaft 27 ... compressor 30 ... gas bearing 33 ... heat exchanger for taking out hot water for hot water supply 34 ... tube for taking out refrigeration medium 41 ... motor Gas engine 42 as a centrifugal chiller 44 as a refrigeration medium outlet pipe

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiichi Tanaka 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi F-term in Osaka Gas Co., Ltd. (reference) 3G081 BB07 BC07 BD00 3L093 AA01 AA03 BB01 BB05 BB26 BB29 BB39 BB44 LL05 MM07

Claims (6)

[Claims] 1. A low-temperature heat source generating exhaust heat at a temperature lower than 130 ° C., a high-temperature heat source generating exhaust heat at a temperature higher than 130 ° C., a regenerator (8) and an absorber (12) A single-effect absorption refrigerator comprising: a condenser (10) and an evaporator (14); and a connection between the low-temperature exhaust heat source and the regenerator (8) such that exhaust heat from the low-temperature exhaust heat source is used as a heat source. Circulation pipe (7), and a non-azeotropic mixed medium containing a refrigerant evaporable by exhaust heat from the low-temperature exhaust heat source from the absorber (12) to the regenerator (8).
A pipe (16) for supplying a non-azeotropic mixed medium from the regenerator (8) to the absorber (12); and a regenerator connected in the middle of the pipe (11). (8) a branch pipe (19) for extracting a part of the non-azeotropic mixed medium supplied to the absorber (12), and a gas pipe connected to the high-temperature exhaust heat source and extracting exhaust gas from the high-temperature exhaust heat source. (4), a heat exchanger that is provided between the gas pipe (4) and the branch pipe (19), and heats and evaporates a non-azeotropic mixed medium with exhaust gas from the high-temperature exhaust heat source ( A steam turbine (21) provided in the branch pipe (19) and driven by the steam of the non-azeotropic mixed medium evaporated in the heat exchanger (20); and the evaporator (14) A steam passage communicating and connecting the absorber (12), and the steam turbine (21) provided in the steam passage.
A compressor (27) that is integrally and operatively connected to generate a pressure difference between the evaporator (14) and the absorber (12) by sucking the vapor in the evaporator (14); And a refrigerating medium take-out pipe (34) attached to take out a refrigerating medium. 2. A gas bearing (30) for supporting a transmission shaft (26) interlockingly connecting a compressor (27) and a steam turbine (21) according to claim 1 and a gas bearing (30). Branch piping (1
9), wherein the steam of the non-azeotropic mixed medium evaporated in the heat exchanger (20) is supplied to the gas bearing (30) for lubrication. 3. A motor (41) having a low-temperature heat source and a high-temperature heat source according to claim 1 or 2, and a centrifugal chiller (42) is operatively connected to the motor (41). An exhaust heat absorption refrigerator that cools an object to be cooled after being cooled by a turbo refrigerator (42) by exchanging heat with a refrigerant for cooling taken out of a refrigerant medium take-out pipe (44). 4. A motor having a low-temperature exhaust heat source and a high-temperature exhaust heat source according to claim 1 or 2, a generator is operatively connected to the motor, and an electric turbo refrigerator is connected to a power line of the generator. , And the object to be cooled after being cooled by the electric turbo chiller is cooled by exchanging heat with a refrigeration medium taken out from a refrigeration medium take-out pipe. 5. The method of claim 1, claim 2, claim 3, or claim 4.
Between the compressor (27) and the absorber (12) in the steam path according to any of the above, the gas discharged from the compressor (27) is supplied from the absorber (12) to the regenerator (8). A waste heat absorption refrigerator provided with a heat exchanger (25) for heating a non-azeotropic mixed medium to be heated. 6. Hot water supply for hot water supply from an exhaust heat source according to any one of claims 1, 2, 3, 4, and 5 to an exhaust gas pipe passing through a heat exchanger (20). Waste heat absorption refrigerator provided with a heat exchanger (33) for use.