| abstract |
A combustion system operated at low cost is provided. A combustion system 1 includes a combustion device 10 that burns fuel, an exhaust line L 1 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device 10 , an air preheater 30 that is disposed in the exhaust line L 1 and that recovers heat from the exhaust gas, and a denitration device 40 that is disposed in the exhaust line L 1 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 40 is disposed downstream from the air preheater 30 in the exhaust line L 1 , and the denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m 2 /g or more. |