碱金属碳酸盐对褐煤程序升温热解过程中H<sub>2</sub>S和NH<sub>3</sub>生成的影响

孟丽莉; 付春慧; 王美君; 常丽萍

碱金属碳酸盐对褐煤程序升温热解过程中H₂S和NH₃生成的影响

太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原 030024

基金项目: 国家自然科学基金(21176165); 高等学校博士学科点专项科研基金博导类资助课题(20111402110009); 山西省留学人员基金(200730)。

详细信息

通讯作者:
常丽萍, Tel/Fax: 0351-6010482; E-mail: lpchang@tyut.edu.cn。

中图分类号: X511
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出版历程
- 收稿日期: 2011-01-11
- 修回日期: 2011-05-19
- 刊出日期: 2012-02-29

Effect of alkali carbonates on the formation of H₂S and NH₃ during temperature programmed pyrolysis of brown coal

Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, China

摘要

摘要: 以内蒙古锡盟褐煤为研究对象,通过HCl/HF洗脱煤中固有矿物质,采用机械混合法对原煤和脱矿物质煤分别负载3%的Li₂CO₃、Na₂CO₃和K₂CO₃,利用固定床程序升温热解-色谱分析法考察了煤中固有矿物质以及负载的碱金属碳酸盐对煤热解过程中H₂S和NH₃生成的影响。结果表明,煤中所固有矿物质对锡盟褐煤热解过程中H₂S和NH₃的生成和释放均有抑制作用,但对H₂S和NH₃生成的影响不同;矿物质的脱除不改变煤中有机结构及硫的存在形态,H₂S的释放温区没有发生改变,而HCN的二次反应是NH₃生成的主要来源之一,酸洗脱矿物质改变了煤中孔结构特性,从而影响不同温度段NH₃的释放。原煤及脱矿物质煤负载的碱金属碳酸盐对其热解过程中H₂S和NH₃的生成都有一定的影响,K₂CO₃除外, 负载到原煤的其他碱金属碳酸盐都抑制了H₂S的生成;Na₂CO₃除外,负载到脱矿物质煤的其他碱金属碳酸盐都促进了NH₃的生成。
- 煤 /
- 热解 /
- 碱金属碳酸盐 /
- H₂S /
- NH₃
Abstract: Using a brown coal from Ximeng mine in Inner Mongolia as raw sample, 3% the carbonates of lithium, sodium or potassium were evenly mixed with raw coal and demineralized coal (the inherent mineral was removed by acid-washing). The effects of the minerals and the alkali carbonates added in raw coal on the formation of H₂S and NH₃ during temperature programmed pyrolysis was studied by a fixed-bed reactor and gas chromatography. The results show that the inherent mineral in Ximeng brown coal can restrain the formation and release of H₂S and NH₃ during pyrolysis. The temperature range of maximum H₂S release from demineralized coal is same to that of raw coal because the organic structure of coal and the form of sulfur are not changed. But the behavior of NH₃ is obviously changed in the different temperature range because the secondary reaction of HCN is also one of main sources for NH₃ formation, which is affected by the pore structure change of coal demineralized by acid-washing. The alkali carbonates added have different effects on the formation of NH₃ and H₂S during pyrolysis. Except for K₂CO₃, the presence of alkali carbonates can prohibit the formation of H₂S. They can promote the formation of NH₃, except for Na₂CO₃ added in demineralized coal.
- coal /
- pyrolysis /
- alkali carbonates /
- H₂S /
- NH₃

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参考文献(12)

俞珠峰, 陈贵峰, 杨丽. 中国洁净煤技术评价方法及评价模型CCTM[J]. 煤炭学报, 2006, 31(4): 515-519. (YU Zhu-feng, CHEN Gui-feng, YANG Li. Methodology of Chinese clean coal technologies evaluation and CCTM model[J]. Journal of China Coal Society, 2006, 31(4): 515-519.)

杨丽, 陈贵锋. 洁净煤技术评价模型及应用[J]. 煤炭学报, 2007, 32(6): 630-633. (YANG Li, CHEN Gui-feng. The clean coal technology model and its application[J]. Journal of China Coal Society, 2007, 32(6): 630-633.)

刘光启, 邓蜀平, 蒋云峰, 熊志建, 王敏龙,李茜. ATP技术用于褐煤热解提质的技术经济分析[J]. 洁净煤技术, 2007, 13(6): 25-28. (LIU Guang-qi, DENG Shu-ping, JIANG Yun-feng,XIONG Zhi-jian, WANG Min-long, LI Qian. ATP technology tech-economic analysis on raise lignite quality[J]. Clean Coal Technology, 2007, 13(6): 25-28.)

TSUBOUCHI N, XU C B, OHTSUKA Y. Effect of alkaline earth metals on N₂ formation during fixed bed pyrolysis of a low rank coal[J]. Fuel Process Technol, 2004, 85(8/10): 1039-1052.

TIAN F J, YU J L, MCKENZIE L J, HAYASHI J, LI C Z. Formation of NOx precursosrs during the pyrolysis of coal and biomass. Part Ⅸ: Effect of coal ash and externally loaded-Na on fuel-N conversion during the reforming of coal and biomass in steam[J]. Fuel, 2006, 85(10/11): 1411-1417.

GUAN R, LI W, LI B. Effects of Ca-based additives on desulfurization during coal pyrolysis[J]. Fuel, 2003, 82 (15/17): 1961-1966.

LIU Q R, HU H Q, ZHOU Q, ZHU S W, CHEN G H. Effect of mineral on sulfur behavior during pressurized coal pyrolysis[J]. Fuel Process Technol, 2004,85(8/10): 863-871.

LIU Q, HU H, ZHOU Q. Effect of inorganic matter on reactivity and kinetics of coal pyrolysis[J]. Fuel, 2004, 83(6): 713-718.

常丽萍. 煤热解、气化过程中含氮化合物的生成与释放的研究. 山西太原: 太原理工大学, 2004. (CHANG Li-ping. Study on the formation and release of nitrogen-containing compounds during coal pyrolysis and gasification. Shanxi Taiyuan: Taiyuan University of Technology, 2004.)

YASUSHI S, MITSUNORI M, HAJIME Y, OSAMU Y, MITSUO K, MAMORU K. The effect of acid treatment of coal on H₂S evolution during pyrolysis in hydrogen[J]. Fuel, 1998, 77(9/10): 907-911.

鲍卫仁, 常丽萍, 谢克昌. 酸洗脱灰对原煤样品性能的影响研究[J]. 太原理工大学学报, 2000, 31(4): 354-357. (BAO Wei-ren, CHANG Li-ping, XIE Ke-chang. Effects of acid washing methods on the characteristics of raw coal[J]. Journal of Taiyuan University of Technology, 2000, 31(4): 354-357.)

庞克亮, 向文国, 赵长遂, 奚白. 钾盐对煤焦-CO₂气化反应特性的影响[J]. 燃烧科学与技术, 2007, 13(1): 63-66. (PANG Ke-liang, XIANG Wen-guo, ZHAO Chang-sui, XI Bai. Gasification of coal char-CO₂ in the presence of potash[J]. Journal of Combustion Science and Technology, 2007, 13(1): 63-66.)

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