Arrangement of a combustion system and a flue gas treatment system, and an injection method

Abstract

In the arrangement of a combustion system and a flue gas treatment system, the combustion system including a combustion chamber with at least an injector, a gas supply line connected to the at least an injector, a fuel supply line connected to the at least an injector. The gas supply line is connected to a source of compressed gas containing CO 2 .

1 . An arrangement of a combustion system and a flue gas treatment system,
 the combustion system comprising   a combustion chamber with at least an injector,   a gas supply line connected to the at least an injector,   a fuel supply line connected to the at least an injector,   wherein the gas supply line is connected to a source of compressed gas containing CO 2 .   
     
     
         2 . The arrangement of  claim 1 , wherein the source of compressed gas containing CO 2  is included in the arrangement. 
     
     
         3 . The arrangement of  claim 1 , wherein the flue gas treatment system comprises
 a multistage compressor for compressing the flue gas discharged from the combustion chamber, and   the source of compressed gas containing CO 2  is a connection at an interstage of the multistage compressor.   
     
     
         4 . The arrangement of  claim 1 , wherein the flue gas treatment system comprises
 a compressor for compressing the flue gas discharged from the combustion chamber,   at least a separation stage downstream of the compressor, for separating CO 2  from other gas contained in the flue gas, and   the source of compressed gas containing CO 2  is a connection downstream of the compressor and upstream of the at least a separation stage.   
     
     
         5 . The arrangement of  claim 1 , wherein the combustion chamber is an oxy-fuel combustion chamber. 
     
     
         6 . The arrangement of  claim 1 , wherein the flue gas treatment system comprises at least a separation stage for separating CO 2  from other gas contained in the flue gas, and
 the source of compressed gas containing CO 2  is a connection downstream of at least one of the separation stages.   
     
     
         7 . The arrangement of  claim 6 , further comprising a heat exchanger for heating the CO 2  separated at the at least one separation stage by cooling the flue gas. 
     
     
         8 . The arrangement of  claim 7 , wherein the flue gas treatment system comprises a compressor for compressing the flue gas discharged from the combustion system, wherein the heat exchanger is connected downstream of the compressor and upstream of the at least one separation stage. 
     
     
         9 . The arrangement of  claim 1 , wherein the injector comprises at least a nozzle,
 the at least a nozzle is connected to the gas supply line, for injecting the compressed gas containing CO 2 , and   the at least a nozzle is connected to a side passage, which in turn is connected to the fuel supply line.   
     
     
         10 . A method for injecting fuel into a combustion chamber, the method comprising:
 supplying a compressed gas containing CO 2  to at least an injector,   supplying a fuel to the at least an injector, and injecting the compressed gas containing CO 2  and the fuel into the combustion chamber together.   
     
     
         11 . The method of  claim 10 , wherein flue gas from the combustion chamber is compressed, wherein supplying a compressed gas containing CO 2  comprises withdrawing at least a part of the flue gas at an interstage during multistage compression. 
     
     
         12 . The method of  claim 10 , wherein flue gas from the combustion chamber is compressed and then CO 2  is separated from other gas contained in the flue gas, wherein supplying a compressed gas containing CO 2  comprises withdrawing at least a part of the flue gas downstream of compression and upstream of the separation. 
     
     
         13 . The method of  claim 10 , wherein the flue gas originates from an oxy-fuel combustion process. 
     
     
         14 . The method of  claim 10 , wherein flue gas from the combustion chamber is compressed and then CO 2  is separated from other gas of the flue gas, and 
     
     
         15 . wherein supplying the compressed gas containing CO 2  comprises withdrawing at least a part of the separated CO 2 . 
     
     
         16 . The method of  claim 10 , wherein the injecting comprises
 injecting the compressed gas containing CO 2  through at least a nozzle, and   having the fuel drawn from the gas passing through the nozzle and injected from the nozzle together with the compressed gas containing CO 2 .