| 摘要 |
<p>PURPOSE:To decrease the quantity of supplying water to a system, and the power consumption for an induced fan, by decreasing the wet rate and the volume of exhaust gas, as well as to recover circulating liquid by a cooling pipe while it is circulating through the absorption tower of a desulfurizer, in a boiler system for combustion of coal-water slurry, combined with an exhaust gas desulfurizer of wet type. CONSTITUTION:Exhaust gas generated in a boiler 1 is led into the cooling tower 3 of a wet type exhaust gas desulfurizer, after the temperature in the gas is lowered down to about 80 deg.C by a gas . gas heat exchanger 9. The gas is cooled by cooling water which is circulating through the cooling tower 3 by a circulating pump 4, and then the gas is led into an absorption tower 5, where sulfurous acid in the gas is absorbed by lime- water slurry fed into the absorption tower 5. The purified exhaust gas is heated again in the gas . gas heat exchanger 9 in order to prevent white smoke, and is exhausted outside from a stack 10. In this case, the quantity of cooling water circulated by the pump 4 can be saved by the method of cooling slurry by dipping a cooling pipe 7 in the slurry in the absorption tower 5. Besides, the consumption of power for an induced fan can be saved as much as the volume corresponding to the decreased exhaust gas, by installing an induced fan 2 on the downstream side of an exhaust gas desulfurizer.</p> |
