期刊文献+

高碱煤与煤矸石掺烧SO_(2)和NO减排及结渣抑制研究 被引量:4

Investigation on cofiring high-alkali coal with coal gangues:SO_(2),NO reduction and ash slagging inhibition
下载PDF
导出
摘要 结渣和沾污是高碱煤燃烧锅炉中普遍存在的难题。同时,源于采煤和洗煤的大量固废煤矸石出于经济和生态考虑亦须实现减量化处理和资源化利用。基于此,通过掺烧高碱煤与煤矸石抑制煤灰沾污和结渣发生以及实现煤矸石的资源化利用,同时考察掺烧过程中污染气体(SO_(2)和NO)的释放及减排行为。结果表明,高碱煤与煤矸石静态的掺烧反应服从三维扩散模型,在一定比例下掺烧反应活化能低于单一燃料燃烧的活化能。掺烧过程中焦炭和CO可还原NO,同时灰分中过渡金属组分可促进NO原位减排,而SO_(2)的减排效果很大程度上取决于两燃料的掺烧比例及其灰分组成。掺烧过程中碱金属有效固留于灰渣中,从而降低煤灰沾污和结渣倾向,而碱土金属(Ca,Mg等)可同时与灰分组成中的硅铝及气相中SO_(2)发生竞争反应。此外,通过改变掺烧煤矸石矿物组成可调节灰渣组成及熔融温度。本研究结果可为通过掺烧高碱煤与煤矸石来缓解锅炉沾污和结渣难题提供科学参考。 Slagging and fouling are common problems in high-alkali coal-fired boilers.Meanwhile,a large amount of solid waste coal gangue from coal mining and coal washing needs to be reduced and utilized for economical and ecological considerations.Given this,cofiring high-alkali coal(HAC)with coal gangues(CG)was performed to verify the possibility of inhibiting ash-related problems of HAC meanwhile achieving resource utilization of CG.Besides,the evolution behaviors of pollution gases(SO_(2)and NO)were examined.The results show that cofiring reaction follows a three dimensional diffusion model,and at proper ratios the activation energy of cofiring can be lower than that of mono-combustion.NO can be efficiently reduced during cofiring with the enhanced catalytic components in the blended fuels,while the reduction of SO_(2)is largely determined by the blending ratio and ash compositions.Alkali metals are effectively retained in ashes thus lowering the fouling and slagging propensity,while alkaline metals participate the competitive reaction with silica and alumina components and that of SO_(2)fixation reactions.The ash fusion temperatures can be adjusted through cofiring with CG with various inherent minerals,thus providing the opportunity to alleviate the ash-related problems for burning HAC in commercial boilers.
作者 黄顺进 张丽 颜井冲 王志刚 雷智平 李占库 任世彪 王知彩 水恒福 HUANG Shunjin;ZHANG Li;YAN Jingchong;WANG Zhigang;LEI Zhiping;LI Zhanku;REN Shibiao;WANG Zhicai;SHUI Hengfu(School of Chemistry&Chemical Engineering,Anhui University of Technology,Ma’anshan 243002,Anhui,China;School of Computer Science and Technology,Anhui University of Technology,Ma’anshan 243002,Anhui,China;College of Chemistry and Chemical Engineering,Dezhou University,Dezhou 253023,Shandong,China)
出处 《化工学报》 EI CSCD 北大核心 2022年第12期5581-5591,共11页 CIESC Journal
基金 国家自然科学基金项目(22178001,21978003,22178002) 安徽省优秀青年科研项目(2022AH030045) 安徽省高校优秀青年人才支持项目(gxyqZD2022029)。
关键词 结渣和沾污 高碱煤 煤矸石 SO_(2)和NO减排 灰熔融温度 slagging and fouling high-alkali coal coal gangues SO_(2)and NO reduction ash fusion temperatures
  • 相关文献

同被引文献40

引证文献4

二级引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部