| 摘要 |
<p>PURPOSE:To save fuel consumption for heating and to denitrate exhaust combutsion gas efficiently, by addn. of hydrocarbon fuel to the exhaust gas before it is fed to a reactor so as to oxidize the hydrocarbon catalytically and to reduce and remove NOx with NH3. CONSTITUTION:After starting operation of denitration apparatus consisting of a multitubular heat-exchanger 1, a heating-up furnace 2, a mixer 3, and a reactor 4, when the temp. at the outlet of the reactor is raised up to 200-400 deg.C, the heating-up furnace 2 is shut down, and simultaneously hydrocabon fuel, e.g., LPG, is added to the exhaust gas at the inlet side of the mixer 3, then the reaction temp. in the reactor 4 is maintained at 200-400 deg.C, by the catalytic oxidation of LPG caused by iron ore, a denitration catalyst, thus catalytic reduction of NOx with NH3 proceeding efficiently. Becuase the hydrocarbon fuel is oxidized catalytically without use of combustion air unlike the heating-up furnace 2, temp. rise of the exhaust gas is very small and heat energy consumption is reduced remarkably.</p> |
