Release characteristics of mercury in coal under O2/CO2 atmosphere

doi:10.16085/j.issn.1000-6613.2017.01.048

Abstract

Abstract: Experimental studies on the mercury release characteristics under O₂/CO₂ atmosphere were carried out in a vertical tube furnace device. The effects of 21%O₂/79%N₂ and 21%O₂/79%CO₂ atmospheres,different O₂ and CO₂ concentrations on the Hg⁰(g) release were investigated. The experimental results show that the mercury mass balance ratio is 83.75%-114.1%,verifying the accuracy of the experimental results. (g) concentration under O₂/N₂ atmosphere is higher than that under O₂/CO₂ atmosphere at 250-400℃. Under O₂/CO₂ atmosphere,Hg⁰(g) release amount is slightly higher than that under O₂/N₂ atmosphere at 400-600℃. With the O₂ concentration increasing,the release amount of the Hg⁰(g) reduces,which indicates that O₂ can enhance Hg⁰(g) oxidation. Hg⁰(g) concentration changes little when CO₂ increases from 0 to 30%. However,Hg⁰(g) release amount increases with the rise of CO₂ from 30% to 50%. This may be because high CO₂ concentration inhibits Hg⁰(g) oxidation.

Key words: O₂/CO₂ atmosphere, coal, combustion, mercury release

摘要： 在立式管式炉实验装置上研究了O₂/CO₂气氛下煤中汞释放特性，考察了21% O₂/79% N₂和21% O₂/79% CO₂两种气氛下Hg⁰（g）的释放特性、富氧气氛下O₂和CO₂浓度对Hg⁰（g）释放特性的影响。结果表明：汞质量平衡率为83.75%~114.1%，验证了实验结果的准确性。在250~400℃之间，O₂/N₂气氛中Hg⁰（g）的释放浓度高于O₂/CO₂气氛；在400~600℃范围内，O₂/CO₂气氛中Hg⁰（g）的释放浓度略高于O₂/N₂气氛；富氧气氛下O₂浓度越高，Hg⁰（g）的释放浓度越低，O₂对Hg⁰（g）的氧化具有促进作用；富氧气氛下CO₂浓度由0升至30%时，其浓度变化对Hg⁰（g）氧化的影响不大，而由30%升至50%时，Hg⁰（g）的释放浓度增加，高浓度的CO₂可能会抑制Hg⁰（g）的氧化。

关键词: O₂/CO₂气氛, 煤, 燃烧, 汞释放

CLC Number:

X511

LI Ya'ning, DUAN Yufeng, WANG Hui, XUE Yuan, ZHU Chun, ZHOU Qiang, ZHANG Jun, SHE Min, LIU Meng. Release characteristics of mercury in coal under O₂/CO₂ atmosphere[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 372-377.

李雅宁, 段钰锋, 王卉, 薛源, 朱纯, 周强, 张君, 佘敏, 刘猛. O₂/CO₂气氛下煤中汞的释放特性[J]. 化工进展, 2017, 36(01): 372-377.

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Release characteristics of mercury in coal under O₂/CO₂ atmosphere

O₂/CO₂气氛下煤中汞的释放特性

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