660MW燃煤锅炉细微颗粒物中次量与痕量元素的分布特性

doi:10.3969/j.issn.0438-1157.2013.08.039

化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2975-2981.DOI: 10.3969/j.issn.0438-1157.2013.08.039

660MW燃煤锅炉细微颗粒物中次量与痕量元素的分布特性

王超¹, 刘小伟¹, 徐义书¹, 吴建群¹, 王建培¹, 徐明厚¹, 林显敏², 李海山², 夏永俊²

1. 华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074;
2. 江西省电力科学研究院, 江西南昌 330096

收稿日期:2012-12-05 修回日期:2013-03-07 出版日期:2013-08-05 发布日期:2013-08-05
通讯作者: 刘小伟
作者简介:王超(1988- ),男,博士研究生。
基金资助:
国家自然科学基金项目(51276072);国家重点基础研究发展计划项目(2013CB228501);煤炭联合基金重点项目(U1261204)。

Distribution characteristics of minor and trace elements in fine particulate matters from a 660 MW coal-fired boiler

WANG Chao¹, LIU Xiaowei¹, XU Yishu¹, WU Jianqun¹, WANG Jianpei¹, XU Minghou¹, LIN Xianmin², LI Haishan², XIA Yongjun²

1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
2. Electric Research Institute of Jiangxi Province, Nanchang 330096, Jiangxi, China

Received:2012-12-05 Revised:2013-03-07 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Natural Science Foundation of China(51276072,U1261204)and the National Basic Research Program of China(2013CB228501).

摘要/Abstract

摘要： 应用承重撞击器(DGI)采样系统在南昌某电厂2^#锅炉电除尘器前进行颗粒物采集,并同时采集了原煤样和底灰样。对飞灰的质量粒径分布、底灰和飞灰中次量与痕量元素的分布特性进行了分析。结果表明PM_1.0和PM_2.5质量分别占PM₁₀质量的16.0%~17.4%和46.9%~50.6%;Na、Mg、P、S主要富集在亚微米颗粒物中,Al、Si、Ca、Ti、Fe、K主要富集在超微米颗粒物中;随着颗粒物粒径的减小,As、Cd、Cr、Pb的浓度逐渐增大,且在亚微米颗粒物中的增幅大于超微米颗粒物,Mn在各级颗粒物中浓度相近;As、Cd、Cr、Pb大量富集于亚微米颗粒物之上,Mn在各级颗粒物中富集特性无明显差异,且各痕量元素挥发特性存在以下规律:As>Cd>Cr>Pb>Mn;文中给出了无控制条件下痕量元素的排放因子,PM_1.0中各元素排放比例存在以下规律:As>Cd>Cr>Pb>Mn。

关键词: 燃煤锅炉, 细微颗粒物, 痕量元素, 次量元素, 分布特性

Abstract: Sampling system with Dekati Gravimetric Impacter(DGI)was positioned in front of the 2^# boiler ESP of a power plant in Nanchang and used to collect PMs,while the samples of raw coal and bottom ash were also taken.The massive particle size distribution of fly ash,the distribution characteristics of minor and trace elements in bottom ash and fly ash were measured and analyzed.The results indicate that the mass of PM_1.0 and PM_2.5 are 16.0%-17.4% and 46.9%-50.6% respectively.Na,Mg,P and S mainly enrich in submicron particles,and Al,Si,K,Ca,Ti and Fe mainly do in supermicron particles. With the decrease of particle size,the concentration of As,Cd,Cr and Pb increases,and the growth rate is higher for submicron particles than for supermicron particles,the concentration of Mn in different PM is similar.A large amount of As,Cd,Cr and Pb involves in the submicron PM,but Mn has no significant difference for different size PM particles.The volatileness of trace elements is As>Cd>Cr>Pb>Mn,and their emission factors under non-controlled conditions are listed in the paper.For PM_1.0,the order of emission ratio of trace elements is the same as volatility,i.e.,As>Cd>Cr>Pb>Mn.

Key words: coal-fired boiler, fine particulate matters, trace elements, minor elements, distribution characteristics

中图分类号:

X513

王超, 刘小伟, 徐义书, 吴建群, 王建培, 徐明厚, 林显敏, 李海山, 夏永俊. 660MW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 Chao, LIU Xiaowei, XU Yishu, WU Jianqun, WANG Jianpei, XU Minghou, LIN Xianmin, LI Haishan, XIA Yongjun. 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.

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660MW燃煤锅炉细微颗粒物中次量与痕量元素的分布特性

Distribution characteristics of minor and trace elements in fine particulate matters from a 660 MW coal-fired boiler

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