Sulfate decomposition from circulating fluidized bed combustors bottom ash

被引：14

作者：

Hoteit, A. ^{[1
]}

Bouquet, E. ^{[1
]}

Schoennenbeck, C. ^{[1
]}

Gilot, P. ^{[1
]}

机构：

[1] Lab Gest Risques & Environm, F-68200 Mulhouse, France

来源：

CHEMICAL ENGINEERING SCIENCE | 2007年 / 62卷 / 23期

关键词：

chemical processes; combustion; environment; fluidization;

D O I：

10.1016/j.ces.2007.07.057

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The decomposition of sulfates present within bottom ashes produced during operation of a fluidized bed combustor is not complete under continuously reducing conditions (2% CO) at 950 degrees C. The product CaS accumulates within the particles. Under alternatively reducing and oxidizing conditions, a complete sulfur release can be obtained. The reduction product CaS is oxidized to SO2 during the oxidizing step. This prevents sulfate accumulation within the particles during the reducing step. Under these cycling conditions, the rate of sulfate decomposition is increased by using a high CO concentration during the reduction phase. The duration of the reduction phase must be optimized to avoid the formation of too much CaS within the particle. (C) 2007 Published by Elsevier Ltd.

引用

页码：6827 / 6835

页数：9