Influence of Dust on High Temperature Desulfurization of Iron Oxide Sorbent.

Zhao, J. ; Huang, J. ; Wu, J. ; Zhang, J. ; Wang, Y.

Technical Information Center Oak Ridge Tennessee

关键词: Hot gas cleanup;    Desulfurization;    Dusts;    Coal;    Capacity;   

RP-ID  :  DE2005836691

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The understanding of influence of deposited dust on desulfurization performance of sorbent is of significance for developing combined processes for simultaneous desulfurization and dust removal in hot gas cleanup. In this paper, the influence of dust from a fluidized-bed coal gasifier on iron oxide desulfurization sorbent made by a kind of waste material containing iron oxide was systemically evaluated at different temperatures (400 C-550 C) and at different quantity of dust (0.5%-5%) in a fixed-bed reactor. The result showed that dust could interact with sorbent and adversely influenced sulfur capacity and sulfidation rate of sorbent. The influence was promoted with increasing sulfidation temperature and quantity of dust. But below 450 C, the interaction could be neglected. Kinetic studies were also conducted using the grain model. Deposition of dust on the surface of the sorbent could cause the deterioration of mass transfer and the decrease of the effective diffusivities.