煤灰在流化床热解过程中对硫迁移特性影响

贾鑫; 王勤辉; 胡赟; 王维宽

doi:10.19666/j.rlfd.201902206

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煤灰在流化床热解过程中对硫迁移特性影响

热能科学研究 | 更新时间：2025-09-28

- 煤灰在流化床热解过程中对硫迁移特性影响
- Effect of coal ash on migration and transformation characteristics of sulfur during coal pyrolysis in fluidized bed reactor
- 热力发电 2019年48卷第10期页码：77-83
- 作者机构：
  
  1. 沈阳环境科学研究院辽宁省城市生态重点实验室
  2. 浙江大学能源清洁利用国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201902206
  中图分类号： TQ530.2
- 网络出版日期：2019-09-29，
  
  纸质出版日期：2019
- 稿件说明：
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贾鑫, 王勤辉, 胡赟, 等. 煤灰在流化床热解过程中对硫迁移特性影响[J]. 热力发电, 2019,48(10):77-83.

JIA Xin, WANG Qinhui, HU Yun, et al. Effect of coal ash on migration and transformation characteristics of sulfur during coal pyrolysis in fluidized bed reactor[J]. Thermal power generation, 2019, 48(10): 77-83.
贾鑫, 王勤辉, 胡赟, 等. 煤灰在流化床热解过程中对硫迁移特性影响[J]. 热力发电, 2019,48(10):77-83. DOI： 10.19666/j.rlfd.201902206.

JIA Xin, WANG Qinhui, HU Yun, et al. Effect of coal ash on migration and transformation characteristics of sulfur during coal pyrolysis in fluidized bed reactor[J]. Thermal power generation, 2019, 48(10): 77-83. DOI： 10.19666/j.rlfd.201902206.

摘要

在小型鼓泡流化床装置上研究了煤灰对热解过程中硫迁移和转化特性的影响规律。实验结果表明:以小龙潭煤为原料的热解过程中

添加煤灰抑制了H_2S和COS的析出

这主要归因于煤灰中的Fe_2O_3与煤气中的H_2S和COS发生了固硫反应;高温下(≥700℃)

煤灰显著促进了SO_2的析出

这是由于高温下煤气中的还原性气体与煤灰中的硫酸钙发生还原反应生成了大量的SO_2;煤灰在低温阶段(≤700℃)促进了CH3SH的分解

从而减少了CH_3SH的析出量;煤灰的存在通过削弱H_2S和半焦的相互作用减少了有机硫的生成量

进而减少了半焦的有机硫含量。

Abstract

By applying a bubbling fluidized bed reactor

the effect of coal ash on migration and transformation characteristics of sulfur during coal pyrolysis was experimentally studied. The results show that

during the pyrolysis of Xiaolongtan coal

the presence of coal ash inhibited the volatilization of H_2S and COS

which was mainly due to the sulfur fixation reaction of Fe_2O_3 in coal ash with H_2 and COS in gas. The coal ash obviously enhanced the SO_2 release at high temperatures(≥700 ℃)

and the possible reason was that large amount of SO_2 was formed through the reactions between the recuding gas and CaSO_4 in the ash. The coal ash promoted the CH_3SH decomposition at low temperatures(≤700 ℃)

thus reduced the CH_3SH release. The addition of coal ash decreased the formation of organic sulfur through inhibiting the interaction between H_2S and semi coke

and finally reduced the organic sulfur content in the semi coke.

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