期刊文献+

铁助剂对长焰煤“热解-燃烧”过程中的减氮脱硝作用 被引量:2

Effect of iron additives on nitrogen reduction and denitrification of long-flame coal during pyrolysis and combustion
下载PDF
导出
摘要 煤燃烧产生大量氮氧化物(NO_(x))对生态环境破坏严重,而民用散煤燃烧排放的NO_(x)是燃煤发电排放的1倍。因此,研究民用散烧NO_(x)排放控制意义重大。基于此,提出对原煤经干馏制备民用洁净燃料,借助“热解减氮+燃烧脱硝”2步耦合机制,实现洁净燃料直接燃烧过程NO_(x)的超低排放。具体研究内容:在管式炉中将煤与金属助剂(FeCl_(3))先经热解制备洁净燃料,再考察洁净燃料燃烧实验过程NO_(x)排放情况。系统研究铁负载比、热解温度、燃烧温度等因素对氮在“热解-燃烧”过程的迁移规律,并对铁助剂的作用机理进行探讨。结果表明:铁助剂的负载比为0.5%,热解温度为1000℃时氮脱除效果最佳,氮脱除率为93.6%。高温热解后的焦炭中铁主要以Fe_(2)O_(3),Fe_(3)O_(4),α-Fe形态存在,这些铁物相能够催化更多的含氮化合物转化为无污染的N_(2);同时,温度的升高也有利于洁净燃料燃烧过程NO_(x)的脱除,在燃烧温度为1000℃时,助剂负载比为0.5%时,NO_(x)排放量为116.68 mg/m^(3),相比原煤燃烧NO_(x)排放减少了46.7%。燃烧过程形成的Fe_(2)O_(3)对NO_(x)与CO,C的还原反应有一定的催化作用,可以催化燃烧过程形成的NO转化为N_(2)。铁助剂的进一步引入,借助“热解减氮-燃烧脱硝”的机制,实现了洁净燃料燃烧NO_(x)超低排放的效果。 The nitrogen oxide(NO_(x))emitted from coal combustion causes serious pollution to the ecological en-vironment,and the direct combustion of household coal accounts for more than 50%of the total emission of coal pollutants.Based on this,it was proposed to achieve the ultra-low emission of NO_(x)through two-step coupling of“pyrolysis nitrogen reduction+combustion denitrification”.The pyrolysis and combustion experiments of coal and metal auxiliary(FeCl_(3))were carried out in a tubular furnace,and the migration rules of nitrogen in the“pyrolysis and combustion”process were systematically studied by such factors as iron load,pyrolysis temperature and combustion temperature,and the action mechanism of iron auxiliary was discussed.The results showed that when the load ratio of iron additives is 0.5%and the pyrolysis temperature is 1000℃,the nitrogen removal effect is the best,the nitrogen removal rate increases from 66.6%to 93.6%.After high temperature pyrolysis,the iron in coke mainly exists in the forms of Fe_(2)O_(3),Fe_(3)O_(4)andα-Fe,these iron phases can catalyze the conversion of more nitrogen-containing compounds into pollution-free N_(2).At the same time,the increase in temperature is also conducive to the removal of NO_(x)in the combustion process of clean fuel.When the combustion temperature is 1000℃and the additive load is 0.5%,the amount of NO_(x)emission is 116.68 mg/m^(3),which is 46.7%less than the NO_(x)emission from raw coal combustion.High temperature is conducive to NO_(x)removal.When the combustion tem-perature is 1100℃,NO_(x)emissions are reduced by 46.7%.Fe_(2)O_(3)formed in the combustion process has a certain catalytic effect on the reduction reaction of NO_(x),CO and C,and can catalyze the conversion of NO formed in the combustion process into N_(2).By adding iron additives in one step,the effects of reducing nitrogen and burning denitrification in two steps were achieved.
作者 阎志中 张凯霞 刘月华 刘守军 杨颂 杜文广 YAN Zhizhong;ZHANG Kaixia;LIU Yuehua;LIU Shoujun;YANG Song;DU Wenguang(Shanxi Taiyuan Technology Asset Management Co.,Ltd,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory for Coal Science and Technology of Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Province Civil Clean Fuel Engineering Research Center,Taiyuan 030024,China)
出处 《煤炭学报》 EI CAS CSCD 北大核心 2021年第4期1155-1163,共9页 Journal of China Coal Society
基金 国家自然科学基金资助项目(21878210) 山西省高等学校科技创新资助项目(2019L0313) 山西省专利推广实施资助计划资助项目(20200719)。
关键词 减氮脱硝 热解-燃烧 长焰煤 助剂 民用散烧 氮氧化物 nitrogen reduction and denitrification pyrolysis and combustion long flame coal additives household coal nitrogen oxide
  • 相关文献

参考文献7

二级参考文献94

共引文献67

同被引文献32

引证文献2

二级引证文献2

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