| 摘要 |
<p>PURPOSE:To provide a method for reducing NOx in exhaust gas from a recovery boiler and to reduce Cl concentration in ash deposited on a superheater etc. CONSTITUTION:An aqueous solution of ammonium sulfate is fed from spray nozzles 104a, 106b, 104c, 104d to the furnace 101 of a boiler for pulp drainage recovery through a pump 103. Fuel black liquid is fed to the furnace 101 by a supply line 105, and the secondary air is fed by a supply line 106. The aqueous solution of ammonium sulfate (0.5-20wt.%) is injected in the furnace 101. The solution is injected at a spreading angle of 90-100 deg. under pressure of 2-3kg/cm<2>. In this way, the concentration of NOx is reduced from 105ppm to 52ppm, and the amount of ash deposited on a superheater 107 is also reduced.</p> |
