| 摘要 |
<p>PURPOSE:To improve the performance of an electrical dust precipitator by charging a calcium-contg. refining agent in a waste gas line thereby decreasing the electrical resistance of fly ash. CONSTITUTION:The waste gas from a boiler 6 is cooled in a preheater 7 and is fed to an electrical dust precipitator 8, where the gas is removed of dust and is thereafter fed to a wet type desulfurizer 8. Measuring device 13, 15 which measure soot density A or SO2 density B are provided in the outlet of the precipitator 8. Said devices input the density signals A, B to a control unit 14. An adequate amt. of a calcium-contg. refining agent is calculated in the unit 14 and is outputted to an adding device 12 for the refining agent. The device 12 adds CaSO4, CaSO3, etc. in the form of liquid or powder from a coal transfer line 2 to a mill 4 up to the high temp. part in the outlet of a boiler 6. CaSO4 and CaSO3 to be by-produced in the desulfurizer 9 are used for the Ca-contg. refining agent such as CaSO4 and CaSO3.</p> |
