Discrete Element Numerical Simulation of Fluidity of High Moisture Lignite

doi:10.12096/j.2096-4528.pgt.23145

Abstract

Abstract:

Objectives Due to the fact that the actual operation of the thermal power plant uses high moisture lignite, problems such as blockage and adhesion often occur during coal transportation. Therefore, this article uses EDEM software for numerical simulation analysis based on these problems. Methods Through the investigation and analysis of on-site coal samples, in the simulation process, the particle size, moisture content, and total flow of coal were mainly analyzed, and its impact on the fluidity of coal was exploved. After numerical simulation analysis, the effects of various factors were compared using flow velocity and forces between particles. Results The main reasons for blockage are as follons: firstly, the relative interaction between coal particles during the flow process in the silo is caused by the coal particle size being too large or too small; Secondly, as the amount of coal increases, the flow state of coal in the warehouse changes from overall flow to central flow; The last and most important factor is the moisture content of coal, which not only affects its own adhesion but also increases its own weight. Therefore, excessive moisture can cause slow flow and blockage. Conclusions The research results can provide theoretical support for solving the problem of coal blockage in coal-fired power plants.

Key words: thermal power plant, EDEM simulation, coal flowability, coal blockage, moisture content, particle size

CLC Number:

TK 01

Jia LIU, Baizhong SUN, Ziwei GAO. Discrete Element Numerical Simulation of Fluidity of High Moisture Lignite[J]. Power Generation Technology, 2024, 45(5): 969-974.

Figures/Tables 8

Tab. 1 Material properties

种类	泊松比	剪切模量/MPa	密度/(kg/m³)
煤	0.3	2.5	750
钢	0.3	10 000	7 850

Tab. 2 Material contact properties

接触材料	恢复系数	静摩擦因数	动摩擦因数
煤-煤	0.6	0.5	0.05
煤-钢	0.5	0.4	0.05

Fig. 1 Schematic diagram of three-dimensional model of coal bunker

Fig. 2 Schematic diagram of coal bunker flow state

Fig. 3 Schematic diagram of coal bunker flow state

Fig. 4 Schematic diagram of coal flow arching

Fig. 5 Variation of force between particles during particle flow

Fig. 6 Changes in velocity of particles falling with different water contents

References 17

1	宋刚．中心给料机在煤仓治堵中的应用与研究[D]．北京：中国矿业大学，2019．
	SONG G ．Application and research of central feeder in coal bunker blocking[D]．Beijing：China University of Mining and Technology，2019．
2	沈宏武．粉煤流动性及其影响因素探究[D]．淮南：安徽理工大学，2017．
	SHEN H W ．Study on the fluidity of pulverized coal and its influencing factors[D]．Huainan：Anhui University of Science and Technology，2017．
3	YUUKI M，RYO N， KAZUYA U，et al ．Some factors influencing the fluidity of coal blends：particle size，blend ratio and inherent oxygen species[J]．Fuel Processing Technology，2017，159：67-75． doi:10.1016/j.fuproc.2017.01.017
4	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．
5	SOLOMON P R， BEST P E， YU Z Z，et al ．An empirical model for coal fluidity based on a macromolecular network pyrolysis model[J]． Energy Fuels，1992，6(2)：143-154． doi:10.1021/ef00032a005
6	周龙．基于离散元法的玉米种子建模及播种过程的仿真分析与试验研究[D]．长春：吉林大学，2021．
	ZHOU L ．Modeling of corn seeds based on discrete element method and simulation analysis and experimental study of sowing process [D]．Changchun：Jilin University，2021．
7	尹成．岩石拉压实验的颗粒离散元模拟[D]．成都：西南交通大学，2014．
	YIN C ．Particle discrete element simulation of rock tensile and compressive experiment[D]．Chengdu：Southwest Jiaotong University，2014．
8	刘春，乐天呈，施斌，等．颗粒离散元法工程应用的三大问题探讨[J]．岩石力学与工程学报，2020，39(6)：1142-1152． doi:10.13722/j.cnki.jrme.2019.0977
	LIU C， LE T C， SHI B，et al ．Discussion on three major problems in engineering application of particle discrete element method[J]．Journal of Rock Mechanics and Engineering，2020，39(6)：1142-1152． doi:10.13722/j.cnki.jrme.2019.0977
9	罗佳伟．煤灰及铁矿石熔融与流动特性实验研究[D]．杭州：浙江大学，2022． doi:10.53469/jissr.2022.09(04).17
	LUO J W ．Experimental study on melting and flowing characteristics of coal ash and iron ore[D]．Hangzhou：Zhejiang University，2022． doi:10.53469/jissr.2022.09(04).17
10	郑强．下行床热解器中高温高通量半焦/煤流动-传热-反应过程数值计算研究[D]．太原：太原理工大学，2021．
	ZHENG Q ．Numerical calculation of the flow-heat transfer-reaction process of high-temperature and high-flux semi-coke/coal in the down-bed pyrolyzer[D]．Taiyuan：Taiyuan University of Technology，2021．
11	SEN K， DEBNATH T， GHORAI S，et al ．Deciphering the differential influence of organic additives on coal fluidity development：a first-principles investigation[J]．Energy & Fuels，2021，35(5)：365-374． doi:10.1021/acs.energyfuels.0c04324
12	Research Metals ．Investigators from JFE steel corporation release new data on metals research (addition effect of aromatic amines on coal fluidity and coke strength)[J]．Technology News Focus，2019，56：278-291． doi:10.2355/isijinternational.isijint-2018-815
13	Engineering Engineering-Geoscience ．Recent studies from china university of mining and technology add new data to Geoscience Engineering (An analysis of the layered failure of coal：new insights into the flow process of outburst coal)[J]．Ecology Environment & Conservation，2018，24(6)：456-467．.
14	朱晓蒙，蔡晓兰，周蕾，等．离散元软件EDEM在矿冶工程中的应用与研究[J]．软件导刊，2021，20(12)：93- 98．
	ZHU X M， CAI X L， ZHOU L，et al ．Application and research of edem in mining and metallurgy engineering[J]．Software Guide，2021，20(12)：93-98．
15	张宝金，陈宏宇，吴东，等．基于EDEM模拟振动参数对计量斗矿物粘附的影响[J]．工业控制计算机，2021，34(7)：73-75．
	ZHANG J B， CHEN H Y， WU D，et al ．Simulation study on vibration parameters of metering bucket based on EDEM[J]．Industrial Control Computer，2021，34(7)：73-75．
16	顿国强，陈海涛，冯夷宁，等．基于EDEM软件的肥料调配装置关键部件参数优化与试验[J]．农业工程学报，2016，32(7)：36-42． doi:10.11975/j.issn.1002-6819.2016.07.005
	DUN G Q， CHEN H T， FENG Y N，et al ．Parameter optimization and test of key components of fertilizer mixing device based on EDEM software[J]．Journal of Agricultural Engineering，2016，32(7)：36-42． doi:10.11975/j.issn.1002-6819.2016.07.005
17	李海伟．散状物料流动性能试验方法的研究及EDEM仿真[D]．太原：太原科技大学，2016．
	LI H W ．Research on the test method of fluidity of bulk materials and EDEM simulation[D]．Taiyuan：Taiyuan University of Science and Technology，2016．

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