Combustion system

Abstract

A biogas combustion system that obtains a stable output and saves energy is realized. A combustion system comprises a separation portion 14 that removes carbon dioxide from a treatment target gas containing a mixture gas containing methane as a main component and containing carbon dioxide to obtain methane gas of a high purity in which at least a content of carbon dioxide has been reduced, and a combustion portion 15 that combusts the methane gas. The separation portion 14 includes a first treatment chamber 11 and a second treatment chamber 12 separated from each other by a separation membrane 13 therebetween. The separation membrane 13 selectively allows the carbon dioxide in the treatment target gas supplied to the first treatment chamber 11 to pass therethrough to the second treatment chamber 12 to obtain a first separation gas having a higher methane purity than the treatment target gas in the first treatment chamber 11 and a second separation gas containing the carbon dioxide in the treatment target gas in the second treatment chamber 12.

1 . A combustion system comprising:
 a separation portion that removes carbon dioxide from a treatment target gas containing a mixture gas containing methane as a main component and containing carbon dioxide to obtain methane gas of a high purity in which at least a content of carbon dioxide has been reduced; and   a combustion portion that combusts the methane gas,   wherein the separation portion includes a first treatment chamber and a second treatment chamber separated from each other by a separation membrane therebetween,   wherein the separation membrane selectively allows the carbon dioxide in the treatment target gas supplied to the first treatment chamber to pass therethrough to the second treatment chamber to obtain a first separation gas having a higher methane purity than the treatment target gas in the first treatment chamber and a second separation gas containing the carbon dioxide in the treatment target gas in the second treatment chamber, and   wherein the separation membrane is a facilitated transport membrane to which a carrier that selectively reacts with carbon dioxide is added.   
     
     
         2 . (canceled) 
     
     
         3 . The combustion system according to  claim 1 , comprising a water vapor supply portion that supplies water vapor to the first treatment chamber,
 wherein the mixture gas containing the water vapor supplied by the water vapor supply portion is supplied to the first treatment chamber as the treatment target gas.   
     
     
         4 . The combustion system according to  claim 3 , wherein the water vapor supply portion supplies, to the first treatment chamber, water vapor generated by heating water by heat exchange with a high-temperature exhaust gas generated by a combustion of methane by the combustion portion. 
     
     
         5 . The combustion system according to  claim 3 , wherein the water vapor supply portion supplies water vapor contained in an exhaust gas generated by the combustion of methane by the combustion portion to the first treatment chamber. 
     
     
         6 . The combustion system according to  claim 3 , further comprising an exhaust gas supply portion that mixes the mixture gas with at least part of an exhaust gas containing carbon dioxide and water vapor generated by the combustion of methane by the combustion portion and supplies the mixture gas mixed with the at least part of the exhaust gas to the first treatment chamber as the treatment target gas. 
     
     
         7 . The combustion system according to  claim 3 , further comprising a water vapor removing portion that removes water vapor from the first separation gas and supplies the first separation gas from which water vapor has been removed to the combustion portion. 
     
     
         8 . The combustion system according to  claim 7 , wherein the water vapor supply portion supplies the water vapor removed by the water vapor removing portion to the first treatment chamber. 
     
     
         9 . The combustion system according to  claim 1 , further comprising a sweep gas supply portion that supplies a sweep gas to the second treatment chamber. 
     
     
         10 . The combustion system according to  claim 9 ,
 wherein the sweep gas contains water vapor, and   the water vapor supply portion supplies the water vapor contained in the sweep gas to the sweep gas supply portion.   
     
     
         11 . The combustion system according to  claim 7 , further comprising a sweep gas supply portion that supplies a sweep gas containing water vapor to the second treatment chamber,
 wherein the sweep gas supply portion supplies the sweep gas containing the water vapor removed by the water vapor removing portion to the second treatment chamber.   
     
     
         12 . The combustion system according to  claim 9 , wherein the sweep gas supply portion supplies, to the second treatment chamber, water vapor generated by heating water by heat exchange with a high-temperature exhaust gas generated by the combustion of methane by the combustion portion. 
     
     
         13 . The combustion system according to  claim 9 , wherein the sweep gas supply portion supplies water vapor contained in an exhaust gas generated by the combustion of methane by the combustion portion to the second treatment chamber. 
     
     
         14 . The combustion system according to  claim 1 , wherein the mixture gas contains a gas derived from a biogas generated by methane fermentation of organic matter. 
     
     
         15 . The combustion system according to  claim 14 , further comprising a desulfurization apparatus including a super-high desulfurization catalyst to remove a sulfur component contained in the gas derived from the biogas.