| 摘要 |
<p>PURPOSE:To improve the efficiency of dust collection by removing SOX in exhaust gas as fine solid particles with droplets of alkali, and adjusting the temperature of the inlet gas of an apparatus collecting the particles to a temperature above dew point, thereby SOX removing apparatus is operated more effectively as compared with the conventional system. CONSTITUTION:SOX in exhaust gas of a boiler 1 is converted to fine solid particles of Na2SO3 in the presence of NaOH droplets in a desulfurizing reaction tower 11, and the SOX is removed as fine solid particles of Na2SO3. There is provided a thermometer 20 at the inlet of an electric precipitator 12 recovering the particles. By the signal of the thermometer 20, fuel supplied to a front burner 21 at the inlet of the reaction tower 11 is controlled through a control box 18 by a valve 22, and the temperature of the inlet gas of the electric precipitator 12 is controlled to a temperature above a dew point (about 90 deg.C). A heater 9 in the upper stream of the reaction tower 11 is provided with a by-pass duct 33. By the signal of the thermometer 20, a damper 34 is controlled, and a flow meter 15 and a SOX meter are also controlled. Further, SOX amount in the exhaust gas leaving the electric precipitator 12 is converted to a control signal, and the valves 25, 29 of an alkali atomizer 26 are controlled, thereby the recovery efficiency of the electric precipitator 12 is improved.</p> |
