| 摘要 |
<p>PURPOSE:To dispense with the treatment of the N components in collected ash by successively arranging a denitration device, a dry electrostatic precipitator, an NH3 injector, a gas heat exchanger, and a desulfurizer to a combustion exhaust gas flue. CONSTITUTION:The exhaust gas from a boiler 1 is freed of NOx at the denitration device 4, then the heat is exchanged at an air preheater 3, and the dust is removed at the dry electrostatic precipitator 4. At this time, the SO2 in the exhaust gas generated from the boiler 1 is adsorbed and collected by coal ash, the greater part of the SO2 is removed at the dry electrostatic precipitator 4, a part of the SO2 is neutralized with the NH3 supplied form the NH3 injector 8 through a line A, the heat is exchanged in the gas heat exchanger 5, and the corrosion of the heat exchanger 5 is prevented in this case. The N-S compd. formed by the neutralization is treated by the desulfurizer 6, and the purified gas is discharged from a stack 7.</p> |
