准东煤中碱金属的赋存形式及其在燃烧过程中的迁移规律实验研究

刘敬; 王智化; 项飞鹏; 黄镇宇; 刘建忠; 周俊虎; 岑可法

准东煤中碱金属的赋存形式及其在燃烧过程中的迁移规律实验研究

浙江大学能源清洁利用国家重点实验室热能工程研究所, 浙江杭州 310027

基金项目: 国家重点基础研究发展规划（973计划，2012CB214906）。

详细信息

通讯作者:
王智化（1977-），男，教授，主要从事煤粉高效低污染燃烧、多种污染物一体化协同脱除等，E-mail：wangzh@zju.edu.cn

中图分类号: TQ534
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出版历程
- 收稿日期: 2013-09-03
- 修回日期: 2013-11-25
- 刊出日期: 2014-03-31

Modes of occurrence and transformation of alkali metals in Zhundong coal during combustion

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 对新疆煤采用三步化学提取实验（蒸馏水洗、醋酸铵洗、稀盐酸洗）以分析其碱金属赋存特性，对水溶的阴离子进行了离子色谱分析。分别检测了在不同温度、不同停留时间下准东煤灰的碱金属量，并用Factsage软件模拟该煤灰中碱金属的析出形式。结果表明，煤中的钠主要是水溶钠，钾主要以不可溶钾存在，水溶碱金属主要以水合离子形式的氯化物存在。准东煤中碱金属在400~600 ℃析出最快，主要是水溶态碱金属的释放，碱金属的释放主要发生在燃烧后期。灰中碱金属在高温下会与烟气中的成分发生反应，主要产物是氯化物以及氢氧化物。在700 ℃钠对准东煤中低温共融物的形成有很大贡献。
- 准东煤 /
- 碱金属 /
- 赋存 /
- 迁移
Abstract: The sequential chemical extraction (three steps) was used to examine the modes of occurrence of alkali metals in four kinds of Xinjiang coals based on the solubility in distilled water, ammonium acetate and hydrochloric acid. The water-soluble anions were analysed by ion chromatography. The contents of alkali metals in the coal ash made at different temperatures and residence times were measured respectively, and the release forms of alkali metals from coal ash were also simulated by Factsage. Results show that the most of sodium in coal is the water-soluble one and the potassium only exists in the insoluble form. Water-soluble alkali metals may exist in the form of hydrated ion of chloride. The release of alkali metals from coal is the fastest during 400~600 ℃,which are mostly water-soluble alkali metals; and the release of alkali metals mostly occurs at the later stage of combustion. Alkali metals in ash would react with the components of flue gas at high temperature, which produces chloride and hydroxide. It can be inferred that the sodium makes a great contribution to the formation of low temperature eutectoid at 700 ℃.
- Zhundong coal /
- alkali metal /
- occurrence /
- transport

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杨忠灿, 刘家利, 何红光. 新疆准东煤特性研究及其锅炉选型[J]. 热力发电, 2010, 39(8): 38-40. (YANG Zhong-can, LIU Jia-li, HE Hong-guang. Study on properties of Zhundong coal in Xinjiang region and type-selection for boilers burning this coal sort[J]. Thermal Power Generation, 2010, 39(8): 38-40.)

岑可法. 锅炉和热交换器的积灰、结渣、磨损和腐蚀的防止原理与计算[M]. 北京: 科学出版社, 1994: 15-33. (CEN Ke-fa. Prevention principle and calculation on fouling, agglomeration, abrasion and corrosion of boil and heat exchanger[M]. Beijing: Science Press, 1994: 15-33.)

BENSON S A, HOLM P L. Comparison of inorganic constituents in three low-rank coals[J]. Ind Eng Chem Pro Res Dev, 1985, 24(1): 145-149.

ZHANG J, HAN C L, YAN Z, LIU K L, XU Y Q, SHENG C D. The varying characterization of alkali metals (Na, K) from coal during the initial stage of coal combustion[J]. Energy Fuels, 2001, 15(4): 786-793.

汉春利, 张军, 颜峥, 刘坤磊, 徐益谦. 煤中钾存在形式研究[J]. 燃烧科学与技术, 2001, 7(2): 167-169. (HANG Chun-li, ZHANG Jun, YAN Zheng, LIU Kun-lei, XU Yi-qian. Modes of occurrence of potassium in coals[J]. Journal of Combustion Science and Technology, 2001, 7(2): 167-169.)

汉春利, 张军, 刘坤磊, 徐益谦. 煤中钠存在形式的研究[J]. 燃料化学学报, 1999, 37(6): 95-98. (HANG Chun-li, ZHANG Jun, LIU Kun-lei, XU Yi-qian. Modes of occurrence of sodium in coals[J]. Journal of Fuel Chemistry and Technology, 1999, 37(6): 95-98.)

余春江, 唐艳玲, 方梦祥, 骆仲泱, 岑可法. 稻秆热解过程中碱金属转化析出过程实验研究[J].浙江大学学报(工学版), 2005, 39(9): 1435-1444. (YU Chun-jiang, TANG Yan-ling, FANG Meng-xiang, LUO Zhong-yang, CEN Ke-fa. Experimental study on alkali emission during rice straw pyrolysis[J]. Journal of Zhejiang University (Engineering Science), 2005, 39(9): 1435-1444.)

卫小芳, 刘铁峰, 黄戒介, 房倚天, 王洋. 澳大利亚高盐煤中钠在热解过程中的形态变迁[J]. 燃料化学学报, 2010, 38(2): 144-148. (WEI Xiao-fang, LIU Tie-feng, HUANG Jie-jie, FANG Yi-tian, WANG Yang. Transformation of Na in an Australian high-sodium coal during pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2010, 38(2): 144-148.)

OLESCHKO H, MULLER M. Influence of coal composition and operating conditions on the release of alkali species during combustion of hard coal[J]. Energy Fuels, 2007, 21(6): 3240-3248.

GLAZER M P, KHAN N A, De JONG W, SPLIETHOFF H, SCHURMANN H, MONKHOUSE P. Alkali metals in circulating fluidized bed combustion of biomass and coal: Measurements and chemical equilibrium analysis[J]. Energy Fuels, 2005, 19(5): 1889-1897.

LIAO Y F, YANG G, MA X Q. Experimental study on the combustion characteristics and alkali transformation behavior of straw[J]. Energy Fuels, 2012, 26(2): 910-916.

BLASING M, MULLER M. Mass spectrometric investigations on the release of inorganic species during gasification and combustion of Rhenish lignite[J]. Fuel, 2010, 89(9): 2417-2424.

JAFFRI G R, CEN K F, WANG Z H. Chemical equilibrium prediction on release of Na, K, Cl and S-species during gasification of biomass, soft and hard Chinese coal at elevated temperature and pressure by fact sage[C]//2012 2nd International Conference on Chemical, Material and Metallurgical Engineering. Kunming: Trans Tech Publications, 2012: 723-730.

TAKUWA T, NARUSE I. Detailed kinetic and control of alkali metal compounds during coal combustion[J]. Fuel Process Technol, 2007, 88(11/12): 1029-1034.

PORBATZKI D, STEMMLER M, MULLER M. Release of inorganic trace elements during gasification of wood, straw and miscanthus[J]. Biomass Bioenergy, 2011, 35(1): 79-86.

杨光. 生物质燃烧过程中碱金属迁移研究[D]. 广州: 华南理工大学, 2012. (YANG Guang. Study on the alkali transformation behavior of straw combustion[D]. Guangzhou: South China University of Technology, 2012.)

GB/T 3558-1996, 煤中氯的测定方法[S]. (GB/T 3558-1996, Determination of chlorine in coal[S].)

RAASK E. Mineral impurities in coal combustion[M]. Washington: Hemisphere Publishing Corporation, 1985: 48-65.

MURRAY J B. Changes in state of combination of inorganic constituents during carbonization of Victorian brown coal[J]. Fuel, 1972, 52(2): 105-111.

STINEPRING C D, STEWART G W. In proceedings of high temperature, high pressure particulate and alkali control in coal combustion process sreams[C]//U.S. Doe Contractor'S Review Meeting. Morgantown, 1981: 301-206.

YANG T H, XING W L, KAI X P, LI R D, HE Y G. The influence of chlorine on the migration behavior of alkali metal during biomass and coal co-combustion[J]. Appl Mech Mater, 2011, 40-41: 335-338.

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