Effect of calcium sulfate addition on the activity of the absorbent for dry flue gas desulfurization

被引：28

作者：

Ishizuka, T

Yamamoto, T

Murayama, T

Tanaka, T

Hattori, H

机构：

[1] Hokkaido Univ, Ctr Adv Res Energy Technol, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[2] Kyoto Univ, Dept Mol Engn, Sakyo Ku, Kyoto 6068501, Japan

[3] Hokkaido Elect Power Co Inc, Dept Res & Dev, Ebetsu, Hokkaido 0670033, Japan

来源：

ENERGY & FUELS | 2001年 / 15卷 / 02期

关键词：

D O I：

10.1021/ef000186n

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The addition of calcium sulfate in the procedures of preparing flue gas desulfurization absorbent from calcium oxide and coal fly ash causes a negative effect in the slaking step and a positive effect in the following hydrothermal treatment step. The role of calcium sulfate added in each step was investigated. For the slaking step, XRD, XAFS, and Raman spectroscopic studies revealed that the addition of calcium sulfate in the step of slaking CaO with coal fly ash resulted in the coverage of calcium hydroxide with calcium sulfate to decrease the reactivity of the calcium hydroxide toward coal fly ash to form calcium silicate. For the hydrothermal treatment step, measurements of XRD, surface area, and Raman spectrum revealed that the addition of calcium sulfate promotes the formation of calcium silicate by suppressing crystal growth of calcium hydroxide to keep the reactivity of the calcium hydroxide toward coal fly ash.

引用

页码：438 / 443

页数：6

共 18 条

[1]

[Anonymous], 1986, U.S. Patent, Patent No. 4629721

[2]

CHU P, 1989, JAPCA-INT J AIR POLL, V39, P1175

[3]

CORBITARTE F, 1992, THERMOCHIM ACTA, V207, P255

[4] Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum [J].