Combustion gas supply system

Abstract

A combustion gas supply system has an air compressor supplying compressed air, a fuel supply device that supplies a fuel and a combustor that generates a pressurized combustion gas by combusting the fuel and the compressed air. At a gas supply and recovery section, the pressurized combustion gas generated by the combustor is supplied to a heat consumption apparatus, and the pressurized combustion gas after heat consumption is recovered as a used gas. A part of the used gas recovered is supplementarily compressed by a re-pressurizing compressor and supplied to the compressed air.

What is claimed is: 
     
         1 . A combustion gas supply system, comprising:
 an air compressor that supplies compressed air;   a fuel supply device that supplies a fuel;   a combustor that generates a pressurized combustion gas by combusting the fuel supplied by the fuel supply device and the compressed air supplied by the air compressor;   a gas supply and recovery section that supplies the pressurized combustion gas generated by the combustor to a heat consumption apparatus and recovers, as a used gas, the pressurized combustion gas whose heat has been consumed; and   a re-pressurizing compressor that supplementarily compresses a part of the used gas recovered by the gas supply and recovery section and supplies the part of the used gas to the compressed air supplied by the air compressor.   
     
     
         2 . The combustion gas supply system according to  claim 1 , wherein the re-pressurizing compressor supplementarily compresses the part of the used gas so as to pressurize the part of the used gas to a same pressure as a pressure of the compressed air supplied by the air compressor, and a remaining part of the used gas is discharged to an outside. 
     
     
         3 . The combustion gas supply system according to  claim 1 , further comprising:
 a cooler that cools the part of the used gas; and   a condensation separator that separates moisture condensed by the cooling, from the part of the used gas,   wherein the re-pressurizing compressor supplementarily compresses the part of the used gas from which moisture has been removed by the condensation separator.   
     
     
         4 . The combustion gas supply system according to  claim 3 , further comprising a heat exchanger that causes the part of the used gas, before being cooled by the cooler, to exchange heat with the part of the used gas supplementarily compressed by the re-pressurizing compressor. 
     
     
         5 . The combustion gas supply system according to  claim 1 , further comprising a flow rate adjustment valve that adjusts a flow rate of the compressed air supplied by the air compressor,
 wherein a proportion of the compressed air supplied by the air compressor and the part of the used gas supplied by the re-pressurizing compressor is adjusted by using the flow rate adjustment valve.   
     
     
         6 . The combustion gas supply system according to  claim 5 , further comprising an oxygen concentration meter that detects an oxygen concentration of the compressed air to which the part of the used gas has been supplied by the re-pressurizing compressor,
 wherein the flow rate adjustment valve is controlled based on a detection value of the oxygen concentration meter.   
     
     
         7 . The combustion gas supply system according to  claim 1 , wherein the fuel supply device includes a fuel compressor and supplies a compressed fuel pressurized to a same pressure as a pressure of the compressed air. 
     
     
         8 . The combustion gas supply system according to  claim 1 , wherein the gas supply and recovery section includes a supply connection member and a recovery connection member that allow the heat consumption apparatus to be connected in a detachable manner. 
     
     
         9 . A combustion gas supply system comprising:
 an air compressor that supplies compressed air;   a fuel supply device that supplies a fuel;   a combustor that generates a pressurized combustion gas by combusting the fuel supplied by the fuel supply device and the compressed air supplied by the air compressor;   a heat consumption apparatus that consumes heat in the pressurized combustion gas and discharges, as a used gas, the pressurized combustion gas whose heat has been consumed; and   a re-pressurizing compressor that supplementarily compresses a part of the used gas discharged from the heat consumption apparatus and supplies the part of the used gas to the compressed air supplied by the air compressor.   
     
     
         10 . The combustion gas supply system according to  claim 9 , wherein the heat consumption apparatus has a heat exchange function for utilizing the pressurized combustion gas as a heat source.