| 摘要 |
<p>PURPOSE:To desulfurize stack gases with high efficiency by the use of inexpensive absorbents in a desulfurizing reactor of a suspension system by providing a heat exchanger which heats the absorbents by the products of reaction captured with the cyclone in the lowermost stage of the reactor. CONSTITUTION:The high temp. waste gas generated in a coal firing boiler 1 is introduced through an intermediate gas removing port 4 into the cyclone 8e in the lowermost stage of a desulfurizing reactor 7. The stack gas ascends successively from the cyclone 8e to the cyclone 8a in the uppermost stage. An absorbent descends successively from a supply device 12 to the cyclone 8a and down to the cyclone 8c, and absorbs the SO2 in the stack gas. The treated gas from the cyclone 8a is discharged through an intermediate return part 5 then through a superheater 2. The products of the reaction in the cyclone 8e are subjected to heat exchange with the absorbent in a heat exchanger 13 and are accumulated in a vessel 16. The absorbent heated to high temp. in the heat exchanger 13 is conveyed through a conveying line 15 into an absorbent supply device 12. Thus, heat loss is decreased, and inexpensive calcium carbonate is usable for the absorbent.</p> |
