Combustion system
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.
1. A combustion system comprising:
a combustion device that burns fuel;
an exhaust line through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device;
an air preheater that is disposed in the exhaust line and that recovers heat from the exhaust gas; and
a denitration device that is disposed in the exhaust line and that removes nitrogen oxide from the exhaust gas using a denitration catalyst,
wherein the denitration device is disposed downstream from the air preheater in the exhaust line, 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.
2. The combustion system according to claim 1 , wherein in the denitration catalyst, an amount of NH 3 desorbed by NH 3 -TPD (TPD: temperature programed desorption) is 10.0 μmol/g or more.
3. The combustion system according to claim 1 or 2 , wherein the denitration device removes nitrogen oxide from the exhaust gas by a selective catalytic reduction method.
4. The combustion system according to claim 1 , wherein the fuel is natural gas.