Influence of bell structure of coke dry quenching furnace on coke distribution

doi:10.11949/0438-1157.20240605

Abstract

Abstract:

The problem of coke particle size segregation in the coke dry quenching (CDQ) furnace can seriously affect the gas-solid heat transfer efficiency. Based on the discrete element method (DEM), this study investigates the actual material surface shape, particle size distribution, and particle size segregation phenomenon generated during the coke loading process of a steel plant's coke dry quenching furnace. Reasonable optimization is carried out on the material surface of the coke dry quenching furnace to improve the particle size distribution of the stacked material surface. The results show that compared to the inclination angle of the bell and the angle between the dividing plate, the direction of the beam has a greater impact on the shape and particle size uniformity of the material surface. Due to the diversion effect of the bell beam on coke particles, it is easy to form inclined stacking material surfaces, resulting in uneven distribution of coke particles. After the direction of the rotating beam is parallel to the opening of the coke pot, the inclining effect of the material surface is weakened, and the segregation of coke particle size is reduced. Under the optimized conditions of 40°—60° inclination angle of the material bell, 30°—60° angle of the dividing plate, and beam direction, the maximum reduction in material height difference is 70.8%, and the maximum reduction in standard deviation is 49.4%, especially at larger angles, the effect is significant, which helps the gas flow uniformly in the packed bed.

Key words: discrete element modeling, coke dry quenching, packed bed, stacked shape, particle size distribution, numerical simulation

摘要：

干熄炉内焦炭粒径偏析问题会严重影响焦炭与冷却气体的气固换热效率。基于离散元方法（DEM）研究某钢厂干熄炉的料钟结构在装焦过程产生的料面形状、粒径分布以及粒径偏析现象，并针对干熄炉的料钟结构进行了优化，以改善焦炭粒径分布。结果表明：相比于料钟倾角和分料板夹角，横梁方向对料面形状和粒径均匀度的影响更大。由于料钟横梁对焦炭颗粒有分流作用，容易形成倾斜堆积料面，导致焦炭颗粒分布不均匀。旋转横梁方向与焦罐布料开口平行后，减弱了料面倾斜效应，降低了焦炭颗粒粒径偏析情况。在40°~60°的料钟倾角、30°~60°的分料板夹角和横梁方向优化条件下，料面高度差最大降低70.8%，标准偏差降低最高49.4%，尤其在较大的倾角和夹角值下效果显著，有助于气体在填充床中均匀流动。

关键词: 分立元件建模, 干熄焦, 填充床, 料面形状, 粒度分布, 数值模拟

CLC Number:

TQ 520.5

Junhao HUANG, Keliang PANG, Fangyuan SUN, Fujun LIU, Zhiyuan GU, Long HAN, Yanquan DUAN, Yanhui FENG. Influence of bell structure of coke dry quenching furnace on coke distribution[J]. CIESC Journal, 2024, 75(S1): 158-169.

黄俊豪, 庞克亮, 孙方远, 刘福军, 谷致远, 韩龙, 段衍泉, 冯妍卉. 干熄炉料钟结构对焦炭布料粒径均匀度影响的模拟研究[J]. 化工学报, 2024, 75(S1): 158-169.

Figures/Tables 18

Fig.1 Hertz-Mindlin(no slip) model

Fig.2 Physical model of coke distributor in CDQ furnace

Table 1 Physical parameters of coke and wall

物质	密度/(kg·m^-3)	杨氏模量/Pa	泊松比	恢复系数	静摩擦因数	滚动摩擦因数
焦炭	980	2.2×10⁷	0.22	—	—	—
炉壁	4500	5.0×10⁹	0.30	—	—	—
焦炭-焦炭	—	—	—	0.20	0.56	0.15
焦炭-炉壁	—	—	—	0.20	0.41	0.09

Table 2 Particle size distribution of coke by five-stage screening

实际焦炭粒径分布/mm	模拟焦炭粒径分布/mm	质量分数/%	数量分数/%
25	75	15.76	51.85
32.5	97.5	18.28	27.37
50	150	42.56	17.50
70	210	18.70	2.80
80	240	4.70	0.47

Fig.3 Coke loaded in a single charge with bell

Fig.4 Stacked shape of coke charging by original beam

Fig.5 The influence of the original beam on distribution of large particle

Fig.6 The influence of the original beam on distribution of small particle

Fig.7 Bell model with 90° rotation of beam

Fig.8 Stacked shape of coke charging by rotational beam

Fig.9 The influence of beam ratation on distribution of large particle

Fig.10 The influence of beam ratation on distribution of small particle

Fig.11 Partitioned statistical method for particle size segregation

Table 3 Width range of each region

区域编号	宽度范围/mm
1	0~1114
2	1114~2228
3	2228~3342
4	3342~4458
5	4458~5570
6	5570~6686
7	6686~7800

Fig.12 Distribution of average particle size in vertical zones

Fig.13 Distribution of average particle size in horizontal zones

Fig.14 Distribution of particle standard deviation in vertical partitioning

Fig.15 Distribution of particle standard deviation in horizontal partitioning

References 30

1	Wang H, Jin B S, Wang X J, et al. Formation and evolution mechanism for carbonaceous deposits on the surface of a coking chamber[J]. Processes, 2019, 7(8): 508.
2	Safarian S. To what extent could biochar replace coal and coke in steel industries?[J]. Fuel, 2023, 339: 127401.
3	杨文彪. 加强干熄焦技术应用, 推动焦化行业绿色发展[J]. 山东冶金, 2012, 34(6): 1-3.
	Yang W B. Strengthen the application of CDQ technology to promote the green development of coking industry[J]. Shandong Metallurgy, 2012, 34(6): 1-3.
4	乔从华. 干熄焦技术的研究及展望[J]. 中国石油和化工标准与质量, 2013, 33(21): 57.
	Qiao C H. Research and prospect of CDQ technology[J]. China Petroleum and Chemical Standard and Quality, 2013, 33(21): 57.
5	山田孝雄, 佐藤政明. 大型高炉の装入物分布と通気性[J]. Kawasaki Steel Giho, 1974, 6: 16-37.
6	Lingiardi O, Partemio C, Burrai O, et al. Burden distribution tests of Siderar`s No.2 blast furnace[J]. Ironmaking Conference Proceedings, 1997, 56: 517-524.
7	Sunahara K, Kamijo C, Inada T. Investigation on mechanism of size and density segregations of burden particles in the blast furnace[J]. Ironmaking Conference Proceedings, 1999, 58: 3-12.
8	Yuta K, Nishihara, N, Kimura M, et al. Application of techniques for packed bed analysis to studies on the construction of large coke dry quenching plants[J]. Nippon Steel Technical Report, 1982, 20: 95-104.
9	Katalka S, Otsuka J, Yasukouchi N, et al. Establishment of coke dry quenching with a coke throughput of 200t/h[C]//Proceedings of the 6th International Iron and Steel Congress. Japan, 1990: 337-344.
10	飯田洋行, 宮田英癒, 斎藤英之. 工キスパートシステムを適用したコークス乾式消火設備自動運転制御システムの開発[J]. 鉄と鋼, 1992, 78: 1-4.
11	刘志成, 冯妍卉, 张欣欣, 等. 干熄炉预存段内料面堆积形状的研究[J]. 燃料与化工, 2006, 37(3): 14-16.
	Liu Z C, Feng Y H, Zhang X X, et al. Study on coke bulk shape in CDQ pre-chamber[J]. Fuel & Chemical Processes, 2006, 37(3): 14-16.
12	Liu Z C, Feng Y H, Zhang X X, et al. Numerical and experimental study on coke size distribution in bell-type charging in the CDQ shaft[J]. Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material, 2008, 15(3): 236-240.
13	刘华飞, 张欣欣. 干熄炉内传热和流体流动的数学模型[J]. 热科学与技术, 2002, 1(2): 113-117.
	Liu H F, Zhang X X. Mathematical model for fluid flow and heat transfer in the cooling shaft of coke dry quenching unit[J]. Journal of Thermal Science and Technology, 2002, 1(2): 113-117.
14	王猛, 朱卫兵, 孙巧群, 等. 提升管内气固流动特性的离散元模拟[J]. 化工学报, 2013, 64(7): 2436-2445.
	Wang M, Zhu W B, Sun Q Q, et al. Discrete element simulation of gas-solids flow behavior in riser[J]. CIESC Journal, 2013, 64(7): 2436-2445.
15	吴迎亚, 蓝兴英, 高金森. 基于DEM模拟的气固鼓泡床内流场间歇性及颗粒相干结构的分析[J]. 化工学报, 2014, 65(7): 2724-2732.
	Wu Y Y, Lan X Y, Gao J S. Analysis of flow field intermittency and coherent structure of particles based on DEM simulation of gas-solids bubbling bed[J]. CIESC Journal, 2014, 65(7): 2724-2732.
16	金默, 刘道银, 陈晓平. 基于离散元方法的高碱煤灰沉积过程数值模拟研究[J]. 化工学报, 2021, 72(4): 1939-1946.
	Jin M, Liu D Y, Chen X P. Numerical simulation research of high-alkali coal ash deposition process based on discrete element method[J]. CIESC Journal, 2021, 72(4): 1939-1946.
17	范正赟, 杨庆斌, 朱长军, 等. 料钟分布器对干熄焦炉内焦炭粒度偏析的作用[J]. 钢铁, 2021, 56(4): 98-102, 110.
	Fan Z Y, Yang Q B, Zhu C J, et al. Effect of distributor of bell-type on coke segregation in CDQ[J]. Iron & Steel, 2021, 56(4): 98-102, 110.
18	范正赟, 杨庆斌, 朱长军, 等. 装焦参数对干熄炉内焦炭分布的影响[J]. 中国冶金, 2020, 30(1): 10-17.
	Fan Z Y, Yang Q B, Zhu C J, et al. Influence of charge parameters on coke distribution in coke dry quenching furnace[J]. China Metallurgy, 2020, 30(1): 10-17.
19	Yu Y W, Westerlund A, Paananen T, et al. Inter-particle percolation segregation during burden descent in the blast furnace[J]. ISIJ International, 2011, 51(7): 1050-1056.
20	Yu Y W, Saxén H. Effect of DEM parameters on the simulated inter-particle percolation of pellets into coke during burden descent in the blast furnace[J]. ISIJ International, 2012, 52(5): 788-796.
21	Ishihara S, Soda R, Zhang Q W, et al. DEM simulation of collapse phenomena of packed bed of raw materials for iron ore sinter during charging[J]. ISIJ International, 2013, 53(9): 1555-1560.
22	Xu W X, Cheng S S, Niu Q, et al. Effect of the main feeding belt position on burden distribution during the charging process of bell-less top blast furnace with two parallel hoppers[J]. ISIJ International, 2017, 57(7): 1173-1180.
23	Yu Y W, Saxén H. Analysis of rapid flow of particles down and from an inclined chute using small scale experiments and discrete element simulation[J]. Ironmaking & Steelmaking, 2011, 38(6): 432-441.
24	Yang W J, Zhou Z Y, Yu A B. Discrete particle simulation of solid flow in a three-dimensional blast furnace sector model[J]. Chemical Engineering Journal, 2015, 278: 339-352.
25	Mitra T, Saxén H. Investigation of coke collapse in the blast furnace using mathematical modeling and small scale experiments[J]. ISIJ International, 2016, 56(9): 1570-1579.
26	Wu S L, Kou M Y, Xu J, et al. DEM simulation of particle size segregation behavior during charging into and discharging from a Paul-Wurth type hopper[J]. Chemical Engineering Science, 2013, 99: 314-323.
27	赵国磊. 无钟高炉装料过程炉料运动分布规律及颗粒偏析行为研究[D]. 北京: 北京科技大学, 2017.
	Zhao G L. Investigations on burden flow and distribution laws and particle segregation behaviors during charging process within bell-less blast furnace[D]. Beijing: University of Science and Technology Beijing, 2017.
28	陈建生. 无钟高炉布料数值模拟研究[D]. 北京: 北京科技大学, 2022.
	Chen J S. Numerical simulation of charging of blast furnace with bell-less top[D]. Beijing: University of Science and Technology Beijing, 2022.
29	Yu Y W, Saxén H. Particle flow and behavior at bell-less charging of the blast furnace[J]. Steel Research International, 2013, 84(10): 1018-1033.
30	Yu Y, Zhang J, Saxén H. LIGGGHTS and EDEM application for charging system of ironmaking blast furnace[C]//Proceedings of the 2017 National Academic Annual Conference on Blast Furnace Ironmaking, China: The Iron-Smelting Division of the Chinese Society for Metals. 2017: 187-200.

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