Experimental Study on Fluidity of High Moisture Lignite

doi:10.12096/j.2096-4528.pgt.22169

Abstract

Abstract:

[Objecttives] The influence of moisture in raw coal, particle size and coal bunker material on the fluidity of raw coal was studied to find out the main reasons for coal clogging in raw coal bunkers. Methods A raw coal flowability experimental device was designed and built to conduct flowability experiments on raw coal with different moisture and particle sizes, and flow characteristics diagrams were drew to obtain the effects of various factors on raw coal flowability. Results The greater the moisture in the raw coal, the more right the broken line in the flow characteristic diagram is, the less the falling mass, the worse the mobility, and the greater the rotation angle required for complete falling.The difference in the initial position of coal falling is due to the difference in static friction between different particle sizes, resulting in different repose angles. At the same time, the decrease in moisture will reduce the friction force and increase the falling mass. The liquidity bend line of polytetrafluoroethylene material is located at the front, and the friction coefficient at the bottom is small. At the same angle, the mass drops more and the mobility is enhanced. Conclusions Moisture plays a key role in the fluidity of raw coal, the influence of particle size on the fluidity of raw coal is weak, and only the interaction with moisture can have a great influence on the fluidity of raw coal. Material also has a greater impact on the fluidity of raw coal, but when the moisture is low, the impact can be ignored.

Key words: coal-fired power, high-moisture lignite, raw coal fluidity, coal blockage, moisture, particle size

CLC Number:

TK 16

Enchang JI, Dong YANG, Baizhong SUN. Experimental Study on Fluidity of High Moisture Lignite[J]. Power Generation Technology, 2024, 45(4): 633-640.

Figures/Tables 9

Fig. 1 Schematic diagram of raw coal fluidity test device

Fig. 2 Diagram of raw coal fluidity experiment

Fig. 3 Teflon material

Fig. 4 The fluidity characteristics of each particle size under different moisture

Tab. 1 Particle size distribution

粒径/mm	质量/kg	粒径质量分布/%
>30	1.00	9.09
(15~30]	2.25	20.45
(10~15]	1.15	10.45
(6~10]	1.30	11.82
[3-6]	1.75	15.91
<3	3.50	31.82

Fig. 5 Flow characteristics of different particle sizes under the same moisture

Fig. 6 Flow characteristics of different materials under 46.7% moisture

Fig. 7 Flow characteristics of different materials under 36.4% moisture

Fig. 8 Flow characteristics of different materials under 25.7% moisture

References 20

1	冯伟忠，李励．“双碳”目标下煤电机组低碳、零碳和负碳化转型发展路径研究与实践[J]．发电技术，2022，43(3)：452-461． doi:10.12096/j.2096-4528.pgt.22061
	FENG W Z， LI L ．Research and practice on development path of low-carbon，zero-carbon and negative carbon transformation of coal-fired power units under“double carbon” targets[J]．Power Generation Technology，2022，43(3)：452-461． doi:10.12096/j.2096-4528.pgt.22061
2	牛皓玮，刘达，陈广娟．双碳及能源安全背景下电煤供需策略演化博弈研究[J]．智慧电力，2022，50(9)：8-15．
	NIU H W， LIU D， CHEN G J ．Evolutionary game of thermal coal supply and demand strategy under carbon peak，carbon neutrality and energy security[J]．Smart Power，2022，50(9)：8-15．
3	连华，刘明浩．基于多时间尺度卷积神经网络的煤改电用户负荷识别方法研究[J]．电网与清洁能源，2023，39(7)：35-43． doi:10.3969/j.issn.1674-3814.2023.07.005
	LIAN H， LIU M H ．A model of load identification for coal-to-power customers based on multi-time scale convolutional neural networks[J]．Power System and Clean Energy，2023，39(7)：35-43． doi:10.3969/j.issn.1674-3814.2023.07.005
4	王晓彬，孟婧，石访，等．煤电与清洁电源协同演进优化模型及综合评价体系研究[J]．电力系统保护与控制，2022，50(13)：43-52．
	WANG X B， MENG J， SHI F，et al ．An optimization model and comprehensive evaluation system for the synergistic evolution of coal-fired power plants and clean power sources[J]．Power System Protection and Control，2022，50(13)：43-52．
5	杜明芳．立筒仓水平侧压力的实验研究与颗粒流模拟分析[D]．上海：同济大学，2003．
	DU M F.Experimental study on horizontal lateral pressure of vertical silo and particle flow simulation analysis[D]．Shanghai：Tongji University，2003．
6	宋卫，李习臣．煤仓堵煤的影响因素分析和处理方案[J]．节能技术，2009(5)：60-63． doi:10.3969/j.issn.1004-3950.2009.05.015
	SONG W， LI X C ．Analysis of influencing factors and treatment of coal blocking in coal bunker[J]．Energy Conservation Technology，2009(5)：60-63． doi:10.3969/j.issn.1004-3950.2009.05.015
7	王智英．原煤仓下煤不畅及防堵煤技术分析[J]．工艺与技术，2020(14)：83-84．
	WANG Z Y ．Analysis of coal obstruction and anti-blocking technology under original coal bunker[J]．Process & Technology，2020(14)：83-84．
8	夏雄，申亮，燕涛，等．某项目的原煤仓堵煤分析及解决方案[J]．技术交流，2020，23(12)：76-78．
	XIA X， SHEN L， YAN T，et al ．Analysis and solution of coal blocking in raw coal bunker of a project[J]．Technical Exchange，2020，23 (12)：76-78．
9	蒲建伟，蒲建泉．防止火电厂煤斗堵煤的气化系统研究[J]．洁净煤技术，2020，26(S1)：153-156．
	PU J W， PU J Q ．Study on the gasification system to prevent coal blocking in coal hopper of thermal power plant[J]．Clean Coal Technology，2020，26(S1)：153-156．
10	王雁珍，刘硕，马野．应用新型螺旋给煤机缓解煤仓堵煤[J]．技术交流，2020，36(3)：41-42．
	WANG Y Z， LIU S， MA Y ．Application of new spiral coal feeder to alleviate coal blocking in coal bunker[J]．Technical Exchange，2020，36(3)：41-42．
11	韩元培，李琦，冷栋云．循环流化床锅炉煤仓防堵煤技术进展[J]．河南化工，2018，35(10)：15-17．
	HAN Y P， LI Q， LENG D Y ．Progress of coal blocking technology in circulating fluidized bed boiler coal bunker[J]．Henan Chemical Industry，2018，35(10)：15-17．
12	钱小文，纪慧泉，龚九洲，等．利用旋转煤斗解决电厂原煤仓堵煤的设计方法[J]．机电工程技术，2018，47(8)：185-188． doi:10.3969/j.issn.1009-9492.2018.08.057
	QIAN X W， JI H Q， GONG J Z，et al ．Design method of solving coal blocking in raw coal silo of power plant by rotating coal scuttle[J]．Mechanical and Electrical Engineering Technology，2018，47(8)：185-188． doi:10.3969/j.issn.1009-9492.2018.08.057
13	刘志明，郑东海，李滢．火电厂原煤仓清堵装置的应用与改进[J]．煤矿机械，2022，43(7)：139-141．
	LIU Z M， ZHENG D H， LI Y ．Application and improvement of blocking removal device for raw coal bunker in thermal power plant[J]．Coal Mine Machinery，2022，43(7)：139-141．
14	孔艳丽，周永刚，赵虹．不同水分、压力对原煤颗粒体系流动特性的影响[J]．煤炭学报，2012，37(S2)：420-425．
	KONG Y L， ZHOU Y G， ZHAO H ．Effect of different moisture and pressure on the flow characteristics of raw coal particle system[J]．Journal of China Coal Society，2012，37(S2)：420-425．
15	LU H F， GUO X L， GONG X，et al ．Study on the fluidization and discharge characteristics of cohesive coals from an aerated hopper[J]．Powder Technology，2011，207(1-3)：199-207． doi:10.1016/j.powtec.2010.10.030
16	孔艳丽．电厂原煤仓堵煤机理试验研究[D]．杭州：浙江大学，2013．
	KONG Y L ．Experimental study on coal blocking mechanism of raw coal bunker in power plant[D]．Hangzhou：Zhejiang University，2013．
17	刘马林．三维矩形槽道中颗粒沉降的数值模拟[J]．应用数学和力学，2011，32(9)：1011-1012． doi:10.1007/s10483-011-1488-7
	LIU M L ．Numerical simulation of particle sedimentation in a 3D rectangular channel[J]．Applied Mathematics and Mechanics，2011，32(9)：1011-1012． doi:10.1007/s10483-011-1488-7
18	施忠凯，王新文．潮湿煤颗粒间液桥力的理论研究叮[J]．选煤技术，2001(5):11-13． doi:10.3969/j.issn.1001-3571.2001.05.004
	SHI Z K， WANG X W ．Research on the theory governing liquid bridging force among wet coal particles[J]．Coal Prepartion Technology，2001(5)：11-13． doi:10.3969/j.issn.1001-3571.2001.05.004
19	傅磊，谢洪勇，刘桦．散料在料仓内流动特性的试验研究[J]．力学季刊，2003，24(4)：482-487．
	FU L， XIE H Y， LIU H ．Experiment study on flow characteristic of granular materials in cylinder storage[J]．Chinese Quarterly of Mechanics，2003，24(4):：482-487．
20	HORVATH V K， JANOSI I M， VELLA P J ．Anomalous density dependence of static friction in sand[J]．Physical Review，1996，54(2)：2005-2009． doi:10.1103/physreve.54.2005

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