磁性灰粒在不同粒级气化灰渣中的分布特性

doi:10.16085/j.issn.1000-6613.2021-1056

摘要/Abstract

摘要：

以气流床煤气化粗渣和细灰为原料，采用筛分和磁选的方法研究了磁性灰粒在不同粒级气化灰渣中的分布特性。结果表明：随着灰渣粒径的减小，在粗渣和细灰中，磁性灰粒的含量均呈现先升高后降低的趋势，磁性灰粒在粗渣中的含量高于细灰。粗渣中，磁性灰粒在0.5~0.25mm粒级中分布最多，该粒级神宁炉和GSP气化炉粗渣在粒度组成中的占比也最高，质量分数分别为38.42%和37.16%，各个粒级中磁性灰粒产率随粒径减小呈递增趋势；细灰中，磁性灰粒在0.074~0.045mm粒级中分布最多，而细灰粒度组成中的占比最高的却是大于0.25mm粒级，磁性灰粒产率在各个粒级都不高，呈现随粒径减小而升高的规律。气化过程中，磁铁矿会更多地富集在凝结团聚且高度玻璃化的大粒径粗渣中，粗渣和细灰中仍有相当量的含铁物相不显磁性。不同粒级煤气化灰渣中磁性灰粒的分布特性可为气化渣分级分质及高值化利用提供基础数据支撑和应用思路。

关键词: 煤气化灰渣, 粒级, 磁性灰粒, 分布特性, 形成机制

Abstract:

The distribution characteristics of magnetic ash particles in different size fractions of gasification slag were studied by sieving and magnetic separation with entrained flow gasification coarse slag and fine ash as raw materials. Results showed that with the decrease of ash particle size, the content of magnetic ash particles in coarse slag and fine ash increased first and then decreased, and the content of magnetic ash particles in coarse slag was higher than that in fine ash. In the coarse slag, the distribution of magnetic ash particles was the most in the 0.5—0.25mm size fraction, and the proportion of the fraction in Shenning gasifier and GSP gasifier coarse slag was also the highest, which were 38.42% and 37.16%, respectively. Besides, the yield of magnetic ash particles in each size fraction increases with the decrease of particle size. In the fine ash, the distribution of magnetic ash particles was the most in the 0.074—0.045mm particle size fraction, while the proportion of fine ash particle size composition was the highest in the > 0.25mm particle size fraction, and the yield of magnetic ash particles was not high in each particle size fraction, showing a law of increasing with the decrease of particle size. During the gasification process, magnetite would be more concentrated in the large-size coarse slag that was agglomerated and highly vitrified, but there was still a considerable amount of iron-containing phase which was not magnetic. The distribution characteristics of magnetic ash particles in different size fractions of coal gasification slag could provide basic data support and application ideas for the classification and high value utilization of coal gasification slag.

Key words: coal gasification slag, particle size fraction, magnetic ash particles, distribution characteristics, formation mechanism

中图分类号:

TQ536.4

吕飞勇, 初茉, 易浩然, 郝焱, 杨彦博, 石旭, 孙星博. 磁性灰粒在不同粒级气化灰渣中的分布特性[J]. 化工进展, 2022, 41(5): 2372-2378.

LYU Feiyong, CHU Mo, YI Haoran, HAO Yan, YANG Yanbo, SHI Xu, SUN Xingbo. Distribution characteristics of magnetic ash particles in gasification slag of different particle sizes[J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2372-2378.

图/表 7

图1 三种气化粗渣粒度分布和磁性灰粒产率

Ⅰ—>1mm；Ⅱ—1~0.5mm；Ⅲ—0.5~0.25mm；Ⅳ—0.25~0.125mm；Ⅴ—0.125~0.074mm；Ⅵ—0.074~0.045mm；Ⅶ—<0.045mm

图2 三种气化细灰粒度组成和磁性灰粒产率

Ⅰ—>0.25mm；Ⅱ—0.25~0.125mm；Ⅲ—0.125~0.074mm；Ⅳ—0.074~0.045mm；Ⅴ—<0.045mm

图3 磁性灰粒在不同粒级粗渣中的分布

Ⅱ—1~0.5mm；Ⅲ—0.5~0.25mm；Ⅳ—0.25~0.125 mm；Ⅴ—0.125~0.074mm；Ⅵ—0.074~0.045mm；Ⅶ—<0.045mm

图4 磁性灰粒在不同粒级细灰中的分布

Ⅱ—0.25~0.125mm；Ⅲ—0.125~0.074mm；Ⅳ—0.074~0.045mm；Ⅴ—<0.045mm

图5 三种气化粗渣磁性灰粒X射线衍射谱

表1 原煤和粗渣（0.074~0.045mm）磁选产物的主要元素组成

样品	各元素质量分数/%
样品	Si	Fe	Ca	Al	Na	Mg	K
GSP-原煤	12.98	5.58	14.51	11.60	0.876	4.28	0.284
GSP-非磁性灰粒	14.75	13.8	12.33	8.88	3.91	2.28	1.28
GSP-磁性灰粒	12.92	19.55	11.36	7.87	3.26	2.19	1.02
四喷嘴水煤浆炉-原煤	12.71	12.78	13.00	8.03	2.41	2.71	0.893
四喷嘴水煤浆炉-非磁性灰粒	18.79	9.28	12.60	9.48	0.917	1.99	1.36
四喷嘴水煤浆炉-磁性灰粒	15.99	16.31	10.21	8.47	0.846	1.64	1.04

图6 磁性含铁物相在煤气化过程中的形成迁移机制

参考文献 22

1	李文英, 易群, 谢克昌. 中美煤炭清洁高效利用技术对比[M]. 北京: 科学出版社, 2014.
	LI Wenying, YI Qun, XIE Kechang. Comparison of clean and high-efficiency coal utilization technologies between China and the United States[M]. Beijing: Science Press, 2014.
2	岑可法. 先进清洁煤燃烧与气化技术[M]. 北京: 科学出版社, 2014.
	CEN Kefa. Advanced clean coal combustion and gasification technology[M]. Beijing: Science Press, 2014.
3	李建军, 但宏兵, 谢蔚, 等. 粉煤灰磁性吸附剂的制备及磷吸附机理[J]. 无机化学学报, 2018, 34(8): 1455-1462.
	LI Jianjun, DAN Hongbing, XIE Wei, et al. Synthesis and phosphorus adsorption of coal-fly-ash magnetic adsorbents[J]. Chinese Journal of Inorganic Chemistry, 2018, 34(8): 1455-1462.
4	汤达祯, Harvey Colin. 燃煤电厂飞灰物质成分筛分磁选实验研究[J]. 中国矿业大学学报, 2000, 29(5): 468-471.
	TANG Dazhen, HARVEY C. Experimental study of screen and magnetic separation of fly ash from power station[J]. Journal of China University of Mining & Technology, 2000, 29(5): 468-471.
5	梁爽. 粉煤灰的矿物学特征与磁性矿物的分选[D]. 西安: 西安建筑科技大学, 2017.
	LIANG Shuang. Mineralogical characteristics of fly ash and separation of magnetic minerals[D]. Xi’an: Xi’an University of Architecture and Technology, 2017.
6	赵永椿, 张军营, 高全, 等. 燃煤飞灰中磁珠的化学组成及其演化机理研究[J]. 中国电机工程学报, 2006, 26(1): 82-86.
	ZHAO Yongchun, ZHANG Junying, GAO Quan, et al. Chemical composition and evolution mechanism of ferrospheres in fly ash from coal combustion[J]. Proceedings of the CSEE, 2006, 26(1): 82-86.
7	BLAHA U, SAPKOTA B, APPEL E, et al. Micro-scale grain-size analysis and magnetic properties of coal-fired power plant fly ash and its relevance for environmental magnetic pollution studies[J]. Atmospheric Environment, 2008, 42(36): 8359-8370.
8	张冬雪. 飞灰、磁珠脱除气态砷的研究及废水脱砷初探[D]. 北京: 华北电力大学(北京), 2016.
	ZHANG Dongxue. Research of fly ash, ferrosphere on gas-phase arsenic removal and modified fly ash on liquid-phase arsenic removal[D]. Beijing: North China Electric Power University, 2016.
9	JIANG L P, LIU P. Covalently crosslinked fly ash/poly(acrylic acid-co-acrylamide) composite microgels as novel magnetic selective adsorbent for Pb²⁺ ion[J]. Journal of Colloid and Interface Science, 2014, 426: 64-71.
10	白进, 李文, 李保庆. 高温弱还原气氛下煤中矿物质变化的研究[J]. 燃料化学学报, 2006, 34(3): 292-297.
	BAI Jin, LI Wen, LI Baoqing. Mineral behavior in coal under reducing atmosphere at high temperature[J]. Journal of Fuel Chemistry and Technology, 2006, 34(3): 292-297.
11	CAO X, KONG L X, BAI J, et al. Effect of water vapor on coal ash slag viscosity under gasification condition[J]. Fuel, 2019, 237: 18-27.
12	盛昌栋, 张军, 徐益谦. 煤中含铁矿物在煤粉燃烧过程中行为的研究进展[J]. 煤炭转化, 1998, 21(3): 14-18
	SHENG Changdong, ZHANG Jun, XU Yiqian. Review on transformations of iron bearing minerals during pulverized coal combustion[J]. Coal Conversion, 1998, 21(3): 14-18.
13	蔡轲靖, 吴建群, 夏祎旻, 等. 基于CCSEM分析的煤中含铁矿物分布对结渣特性的影响研究[J]. 热力发电, 2021, 50(6): 145-150.
	CAI Kejing, WU Jianqun, XIA Yimin, et al. CCSEM-based investigation on effect of distribution characteristics of iron-bearing minerals in coal on slagging behaviors[J]. Thermal Power Generation, 2021, 50(6): 145-150.
14	YANG Y, CHU M, SHI X, et al. Grading characteristics of texaco gasification fine slag: quality distinction and selective distribution of trace elements[J]. ACS Omega, 2020, 5(41): 26883-26893.
15	WU S Y, HUANG S, JI L Y, et al. Structure characteristics and gasification activity of residual carbon from entrained-flow coal gasification slag[J]. Fuel, 2014, 122: 67-75.
16	熊金钰, 李寒旭, 曹祥, 等. 还原性气氛下Fe和FeS₂对煤中含铁矿物演变行为的影响[J]. 中国矿业大学学报, 2014, 43(5): 892-898.
	XIONG Jinyu, LI Hanxu, CAO Xiang, et al. The effects of Fe and FeS₂ on iron-bearing minerals evolution in coal under reducing atmosphere[J]. Journal of China University of Mining & Technology, 2014, 43(5): 892-898.
17	马志斌, 白进, 李文, 等. 高温弱还原气氛下煤灰中矿物质的定量研究[J]. 燃料化学学报, 2016, 44(6): 641-647.
	MA Zhibin, BAI Jin, LI Wen, et al. Quantitative analysis of mineral matters in coal ash under reducing atmosphere at high temperature[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 641-647.
18	白进, 李文, 白宗庆, 等. 兖州煤中矿物质在高温下的变化[J]. 中国矿业大学学报, 2008, 37(3): 369-372.
	BAI Jin, LI Wen, BAI Zongqing, et al. Transformation of mineral matters in Yanzhou coal ash at high temperature[J]. Journal of China University of Mining & Technology, 2008, 37(3): 369-372.
19	白进, 李文, 白宗庆, 等. 高温下煤中矿物质对气化反应的影响[J]. 燃料化学学报, 2009, 37(2): 134-138.
	BAI Jin, LI Wen, BAI Zongqing, et al. Influences of mineral matter on high temperature gasification of coal char[J]. Journal of Fuel Chemistry and Technology, 2009, 37(2): 134-138.
20	HE C, BAI J, LI W C, et al. Iron transformation behavior in coal ash slag in the entrained flow gasifier and the application for Yanzhou coal[J]. Fuel, 2019, 237: 851-859.
21	HE C, BAI J, KONG L X, et al. Effects of atmosphere on the oxidation state of iron and viscosity behavior of coal ash slag[J]. Fuel, 2019, 243: 41-51.
22	GOMES S, FRANÇOIS M, ABDELMOULA M, et al. Characterization of magnetite in silico-aluminous fly ash by SEM, TEM, XRD, magnetic susceptibility, and Mössbauer spectroscopy[J]. Cement and Concrete Research, 1999, 29(11): 1705-1711.

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