Dynamic behavior of trace elements during pyrolysis of coals

被引：41

作者：

Sugawara, K

Enda, Y

Inoue, H

Sugawara, T

Shirai, M

机构：

[1] Akita Univ, Fac Engn & Resource Sci, Akita 0108502, Japan

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

来源：

FUEL | 2002年 / 81卷 / 11-12期

关键词：

pyrolysis; sodium; potassium; selenium; sulfur;

D O I：

10.1016/S0016-2361(02)00063-7

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：

Release behavior of sodium and potassium was followed during pyrolysis of coals in a nitrogen stream up to 1200degreesC. Sodium and potassium in coal and char were classified into five fractions by a serial dissolution method with H2O, CH3COONH4, HCl, H2SO4 and HF solutions. Distribution of selenium in coal matrix and its release behavior were observed for density-separated samples during pyrolysis. The results showed that lower temperature release of potassium was observed during pyrolysis comparing to the sodium release. Fractions of H2O soluble and CH3COONH4 soluble decreased, and fractions of H2SO4 soluble increased with heat treatments for both alkali metals. Selenium was distributed unevenly in the coal matrix and its content was correlated well with pyritic sulfur content but not with organic sulfur content. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1439 / 1443

页数：5