RU2370712C1 - Method of producing cold air in turbo-refrigerator - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: method of producing cold air in turbo-refrigerator comprises atmospheric air withdrawal, compressing aforesaid air in turbo-compressor compressor, cooling it feeding it to turbo-expander compressor inlet. It compresses compressing it additionally, cooling and feeding to turbo-expander turbine inlet, cold air being transferred from turbo-expander turbine outlet to its inlet. Compressed air flow coming from turbo-compressor compressor is divided into two flows. One flow is fed, via air cooler, to the turbo-expander compressor inlet. Second flow, preferably that with lower flow rate, is directed into combustion chamber to oxidise fuel, while resultant combustion products are mixed with steam. Steam is produced by power of gases outcoming from turbo-compressor turbine. Mix obtained is sent to turbo-compressor turbine.

EFFECT: increased refrigeration factor.

1 dwg

Description

The invention relates to refrigeration and can be used to obtain low air temperatures necessary for freezing and storing food.

A known method of producing cold air, including the intake of atmospheric air, its compression in the first turbocompressor with cooling and transmission to the compressor inlet of the second turbocompressor, its additional compression, cooling and transmission to the turbine inlet of the second turbocompressor with the delivery of cold air from the output of its turbine (RF patent No. 2262047, IPC F25В 11/00, publ. 2005.10.10).

There is also a method of producing cold air, including the intake of atmospheric air, its compression in a compressor of a turbocompressor with cooling and transmission to the turbine expander compressor inlet, its additional compression, cooling and transmission to the turbine expander turbine inlet with the delivery of cold air from the turbine expander turbine output (RF patent No. 2084780 IPC F25V 11/00, published 1997.07.20).

This method, as the closest to the proposed technical essence, is selected as a prototype.

Known methods require a source of compressed air to burn fuel. At the same time, the flow rate of the working fluid for a gas turbine engine is very high (it is comparable with the supply of a turbocompressor). If this air is taken from the turbocompressor, then the air supply to the turboexpander is reduced, which will reduce the refrigerating capacity. If air is sent to the combustion chamber after the turboexpander, then it is necessary to reduce the pressure drop in the turboexpander, which means to reduce the air temperature after the turboexpander, to reduce its refrigerating capacity.

The basis of the invention is the task of autonomous production of cold air.

The technical result achieved by solving the problem is expressed in an increase in the refrigeration coefficient.

To solve this problem, a method of producing cold air in a turbo-refrigeration unit, including intake of atmospheric air, its compression in the compressor of a turbocompressor with cooling and transmission of a turbo-expander to the compressor inlet, its additional compression, cooling and transmission to the turbine expander’s turbine inlet with the delivery of cold air from the turbo-expander’s turbine’s output , characterized in that the stream of compressed air leaving the compressor of the turbocompressor is divided into two streams, one of which feeds through the air cooler t to the inlet of the turboexpander compressor, and the second stream, preferably of a lower flow rate, is sent to the combustion chamber for oxidizing the fuel and the resulting combustion products are mixed with steam, which is obtained from the energy of the gases leaving the turbocharger turbine, after which the resulting mixture is fed to the turbine inlet turbocharger.

A comparison of the features of the proposed solution with the features of the prototype indicate its compliance with the criterion of "novelty."

The features of the characterizing part of the claims solve the following functional tasks.

Signs - "... the stream of compressed air exiting the turbocompressor compressor is divided into two streams, one of which is fed to the inlet of the turboexpander compressor through the air cooler, and the second stream, preferably of a lower flow rate, is sent to the combustion chamber to oxidize the fuel ..." - provide compressed air for turboexpander and receiving cold, and for the operation of a gas turbine.

Signs - "... the resulting combustion products are mixed with steam, which is obtained from the energy of the gases leaving the turbocompressor turbine, after which the resulting mixture is fed to the turbine compressor turbine inlet ..." - provide cooling of the combustion chamber, lowering the temperature of the gases after combustion, increase the mass of the worker body entering the gas turbine and thereby compensate for the selection of compressed air to the turboexpander. The production of steam due to the energy of the gases leaving the gas turbine makes it possible to utilize the energy of the exhaust gases and increase the efficiency of the installation.

The technical essence of the proposed solution is illustrated in the drawing. The drawing shows a schematic diagram of an air refrigeration unit, ensuring the implementation of the claimed method.

The drawing shows an air filter 1, a turbocharger 2, a compressor 3, a gas turbine 4, a pneumatic regulator 5, a combustion chamber 6, a steam regenerator 7, a first air cooler 8, a turboexpander 9, a compressor 10, an expander 11, a second air cooler 12.

The inventive method is implemented as follows. The compressor 3 through the air filter 1 draws in atmospheric air and compresses it. Then the pneumatic regulator 5 divides the compressed air into two parts. One part of it enters the combustion chamber 6, where fuel is supplied, as well as steam from the steam regenerator 7. Another part of the compressed air enters through the first air cooler 8 into the compressor 10 of the turboexpander 9. In the compressor 10, the air pressure increases. Then, compressed air through the second air cooler 12 enters the expander 11, where the differential pressure is triggered and the air is cooled. The steam received in the regenerator 7, due to the energy of the gases leaving the gas turbine 4 and entering the combustion chamber 6, increases the mass of the working fluid for the gas turbine 4, because part of the air is taken to a turboexpander 9, and is also used to lower the temperature of the combustion products to a value determined by the maximum heat stress of the material of the turbine blades.

Thus, the proposed method provides an autonomous production of cold air without reducing the refrigeration capacity.

Claims (1)

A method of producing cold air in a turbo-refrigeration unit, including the intake of atmospheric air, its compression in a turbocompressor compressor with cooling and transmission of a turboexpander to the inlet of the compressor, its additional compression, cooling and transmission of turbine expander to the turbine inlet with the output of cold air from the outlet of the turbine expander, characterized in that the compressed air stream leaving the turbocompressor compressor is divided into two streams, one of which is fed through the air cooler to the compressor inlet of the turbo-compressor underder, and the second stream, preferably lower in flow rate, is sent to the combustion chamber for oxidizing the fuel and the resulting combustion products are mixed with steam, which is obtained from the energy of the gases exiting the turbocompressor turbine, after which the resulting mixture is fed to the turbine compressor turbine inlet.