Impacts of typical mineral matter in Zhundong coal on formation of particulate matter

doi:10.11949/j.issn.0438-1157.20161380

Abstract

Abstract:

In the present study, three Zhundong coals with different contents of chlorine and AAEMs (alkali and alkali earth metals) were burned in a high temperature drop tube furnace. The derived particulate matter (PM) was collected with DLPI (Dekati Low Pressure Impactor) sampling system and discussions were performed based on the PM yield and composition. The coal with high contents of chlorine and AAEMs produced ultrafine PM with high contents of Na and Cl, which was of both higher mass yields and larger peak sizes than that of the other coal. The partitioning of Ca into PM was related to its mode of occurrence in coal. Ca in the two untreated coal was mainly migrated into coarse PM and contributed little to the formation of ultrafine PM as it was mostly in inorganic minerals in coal. The extra added HCl had no significant effects on the yield of ultrafine PM while resulted in much higher contents of Na and Cl. The results showed that increasing HCl would not significantly promote the mineral vaporization while it accelerated the formation of chlorides, which nucleated more easily and formed ultrafine PM.

Key words: coal combustion, Zhundong coal, chlorine, particulate matter, AAEM

摘要：

在高温沉降炉上，进行了高氯高碱准东煤、低氯低碱准东煤和由低氯准东煤处理制得的调质准东煤在含不同浓度HCl的模拟空气中的燃烧实验。利用DLPI进行了颗粒物的分级收集，对其质量粒径分布和矿物元素分布特性进行了讨论分析。结果表明，高氯高碱准东煤的超细模态颗粒物生成量和峰值粒径均明显大于其他两种煤，其主要成分为Na和Cl。Ca的迁移特性与其形态密切相关，原煤中的Ca主要以无机矿物形式存在，主要迁移进入粗颗粒物而对超细颗粒物生成贡献较小。气氛中加入不同浓度HCl气体后，低钠煤和调质煤产生细颗粒物中Cl含量均升高，但生成量无显著变化。表明HCl并未显著促进矿物的气化，但会促进NaCl形式矿物蒸气的形成，进而促进成核形成超细颗粒物。

关键词: 煤燃烧, 准东煤, 氯, 颗粒物, AAEM

CLC Number:

TQ028.8

XU Yishu, LIU Xiaowei, ZHANG Penghui, GUO Junzhe, HAN Jinke, WANG Hao, WEI Siyi. Impacts of typical mineral matter in Zhundong coal on formation of particulate matter[J]. CIESC Journal, 2017, 68(4): 1558-1565.

徐义书, 刘小伟, 张鹏辉, 郭俊哲, 韩金克, 王浩, 魏思怡. 高氯准东煤中典型矿物元素对颗粒物生成的影响[J]. 化工学报, 2017, 68(4): 1558-1565.

References 27

[1]	孟建强. 准东煤燃烧及结渣特性研究[D]. 哈尔滨:哈尔滨工业大学, 2013.MENG J Q. Research on combustion and slagging characteristics of Zhundong coal[D]. Harbin:Harbin Institute of Technology, 2013.
[2]	于敦喜, 姚洪. 准东煤燃烧利用研究进展[C]//第二届能源转化化学与技术研讨会. 太原, 2015:26.YU D X, YAO H. Research progress in the combustion of Zhundong coal[C]//2nd Symposium on Energy Transformation Chemistry and Technique. Taiyuan, 2015:26.
[3]	陶玉洁, 张彦威, 周俊虎, 等. 准东煤在燃烧过程中的矿物演变过程及Na、Ca释放规律[J]. 中国电机工程学报, 2015, (5):1169-1175.TAO Y J, ZHANG Y W, ZHOU J H, et al. Mineral conversion regularity and release behavior of Na, Ca during Zhundong coal's combustion[J]. Proceedings of the CSEE, 2015, (5):1169-1175.
[4]	陶玉洁. 高碱金属准东煤燃烧特性及灰渣行为的基础研究[D]. 杭州:浙江大学, 2015.TAO Y J. Basic research on combustion characteristics and ash behaviors of high-alkali Zhundong coal[D]. Hangzhou:Zhejiang University, 2015.
[5]	翁青松, 王长安, 车得福, 等. 准东煤碱金属赋存形态及对燃烧特性的影响[J]. 燃烧科学与技术, 2014, 20(3):216-221.WENG Q S, WANG C A, CHE D F, et al. Alkali metal occurrence mode and its influence on combustion characteristics in Zhundong coals[J]. Journal of Combustion Science and Technology, 2014, 20(3):216-221.
[6]	刘敬, 王智化, 项飞鹏, 等. 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[J]. 燃料化学学报, 2014, (3):316-322.LIU J, WANG Z H, XIANG F P, et al. Modes of occurrence and transformation of alkali metals in Zhundong coal during combustion[J]. Journal of Fuel Chemistry and Technology, 2014, (3):316-322.
[7]	王智化, 李谦, 刘敬, 等. 准东煤中碱金属的赋存形态及其在热解过程中的迁移规律[J]. 中国电机工程学报, 2014, (S1):130-135.WANG Z H, LI Q, LIU J, et al., Occurrence of alkali metals in Zhundong coal and its migration during pyrolysis process[J]. Proceedings of the CSEE, 2014, (S1):130-135.
[8]	邱朋华, 赵岩, 陈希叶, 等. 碱及碱土金属对准东煤热解特性及动力学影响分析[J]. 燃料化学学报, 2014, (10):1178-1189.QIU P H, ZHAO Y, CHEN X Y, et al. Effects of alkali and alkaline earth metallic species on pyrolysis characteristics and kinetics of Zhundong coal[J]. Journal of Fuel Chemistry and Technology, 2014, (10):1178-1189.
[9]	王礼鹏, 赵永椿, 张军营, 等. 准东煤沾污结渣特性研究[J]. 工程热物理学报, 2015, (6):1381-1385.WANG L P, ZHAO Y C, ZHANG J Y, et al. Research on the slagging and fouling characteristics of Zhundong coal[J]. Journal of Engineering Thermophysics, 2015, (6):1381-1385.
[10]	张翔, 乌晓江, 陈楠. 新疆高碱煤沾污结渣特性中试试验研究[J]. 锅炉技术, 2016, (4):44-47.ZHANG X, WU X J, CHEN N. Experimental study on Xinjiang high-alkali ash deposition and slagging behavior in a 3 MWth pilot-scale test facility[J]. Boiler Technology, 2016, (4):44-47.
[11]	樊斌, 于敦喜, 曾宪鹏, 等. 准东煤燃烧中矿物质转化行为的CCSEM研究[J]. 化工学报, 2016, 67(5):2117-2123.FAN B, YU D X, ZENG X P, et al. Mineral transformation during Zhundong coal combustion by CCSEM[J]. CIESC Journal, 2016, 67(5):2117-2123.
[12]	XU M H, YU D X, YAO H, et al. Coal combustion-generated aerosols:formation and properties[J]. Proceedings of the Combustion Institute, 2011, 33(1):1681-1697.
[13]	LIU X W, XU Y S, FAN B, et al. Field measurements on the emission and removal of PM2.5 from coal-fired power stations(2):Studies on two 135 MW CFB boilers respectively equipped with electrostatic precipitator and hybrid electrostatic filter precipitator[J]. Energy & Fuels, 2016, 30(7):5922-5929.
[14]	LIU X W, XU Y S, ZENG X P, et al. Field measurements on the emission and removal of PM2.5 from coal-fired power stations(1):A case study for a 1000 MW ultra-supercritical utility boiler[J]. Energy & Fuels, 2016, 30(8):6547-6554.
[15]	王超, 刘小伟, 吴建群, 等. 220 MW热电联产锅炉中痕量元素的迁移及分布特性[J]. 化工学报, 2014, 65(9):3604-3608.WANG C, LIU X W, WU J Q, et al. Migration and distribution characteristics of trace elements in 220 MW cogeneration boiler[J]. CIESC Journal, 2014, 65(9):3604-3608.
[16]	王超, 刘小伟, 徐义书, 等. 660 MW燃煤锅炉细微颗粒物中次量与痕量元素的分布特性[J]. 化工学报, 2013, 64(8):2975-2981.WANG C, LIU X W, XU Y S, et al. Distribution characteristics of minor and trace elements in fine particulate matters from a 660 MW coal-fired boiler[J]. CIESC Journal, 2013, 64(8):2975-2981.
[17]	YU D X, XU M H, YAO H, et al. Use of elemental size distributions in identifying particle formation modes[J]. Proceedings of the Combustion Institute, 2007, 31(Part 2):1921-1928.
[18]	LI G D, LI S Q, HUANG Q, et al. Fine particulate formation and ash deposition during pulverized coal combustion of high-sodium lignite in a down-fired furnace[J]. Fuel, 2015, 143:430-437.
[19]	GAO Q, LI S Q, YUAN Y, et al. Ultrafine particulate matter formation in the early stage of pulverized coal combustion of high-sodium lignite[J]. Fuel, 2015, 158:224-231.
[20]	WANG Q B, YAO H, YU D X, et al. Emission behavior of particulate matter during co-combustion of coal and biomass in a drop tube furnace[J]. Energy & Fuels, 2007, 21(2):513-516.
[21]	DAVIDSSON K O, AMAND L E, LECKNER B, et al. Potassium, chlorine, and sulfur in ash, particles, deposits, and corrosion during wood combustion in a circulating fluidized-bed boiler[J]. Energy & Fuels, 2007, 21(1):71-81.
[22]	WANG C, LIU X W, LI D, et al. Measurement of particulate matter and trace elements from a coal-fired power plant with electrostatic precipitators equipped the low temperature economizer[J]. Proceedings of the Combustion Institute, 2015, 35(3):2793-2800.
[23]	徐旭, 蒋旭光, 何杰, 等. 煤中氯的赋存形态与释放特性的研究进展[J]. 煤炭转化, 2001, (2):1-5.XU X, JIANG X G, HE J, et al. A review on existence and release of chlorine in coal[J]. Coal Conversion, 2001, (2):1-5.
[24]	王文慧, 贾宝玉, 姚洪, 等. 准东煤热解过程中钠的迁移规律研究[J]. 工程热物理学报, 2015, (12):2733-2737.WANG W H, JIA B Y, YAO H, et al. An investigation of sodium transformation in Zhundong coal during pyrolysis[J]. Journal of Engineering Thermophysics, 2015, (12):2733-2737.
[25]	XU Y S, LIU X W, ZHANG P H, et al. Role of chlorine in ultrafine particulate matter formation during the combustion of a blend of high-Cl coal and low-Cl coal[J]. Fuel, 2016, 184:185-191.
[26]	XU Y S, LIU X W, ZHOU Z J, et al. The role of steam in silica vaporization and ultrafine particulate matter formation during wet oxy-coal combustion[J]. Applied Energy, 2014, 133:144-151.
[27]	张平安, 袁静, 于敦喜, 等. 不同分布形式的钙盐对燃煤三模态颗粒物生成的影响[J]. 燃料化学学报, 2016, (3):273-278.ZHANG P A, YUAN J, YU D X, et al. Influence of different distributions of Ca-mineral in coal on trimodal particulate matter formation during combustion[J]. Journal of Fuel Chemistry and Technology, 2016, (3):273-278.