| 摘要 |
<p>PURPOSE:The treating method for the waste gas absorption product, for releasing N2 gas and for recovering the simple substance S2, by absorbing the waste gas including NOx and SO2 into an aqueous solution including the iron chelate salt and K2SO3, and by thermally decomposing and reducing NH(SO3K)2, etc., obtained from crystallization of the cooled absorbent solution. CONSTITUTION:The waste gas including NOx and SO2 is contacted with the aqueous solution including the iron chelate salt and K2SO3; the abosrbent solution including the product, NH(SO3K)2, K2S4O6, and K2SO4, is cooled for crystallizing the absorption product, and crystals are separated by filtration whose filtrate is recycled and is contacted with the waste gas. The separated crystals are indirectly heated to 250-400 deg.C for thermally decomposing NH(SO3K)2 into K2SO4 and SO2, producing concentrated SO2 gas. The residual NH(SO3K)2 and K2SO4 are decomposed and reduced under high temperatures forming K2Sx and K2CO3; hereupon, the gaseous product including NH3 is burnt away for removal. K2Sx is treated with CO2 gas and steam producing H2S and SO2 gas and K2CO3; from this H2S and SO2 gas, the simple substance S2 is formed.</p> |
