Optimization and Simulation of Inclined Channel Area Lining for CDQ Ovens

doi:10.19691/j.cnki.1004-4493.2022.02.005

China's Refractories ›› 2022, Vol. 31 ›› Issue (2): 24-29.DOI: 10.19691/j.cnki.1004-4493.2022.02.005

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Optimization and Simulation of Inclined Channel Area Lining for CDQ Ovens

CAO Huiyan^*(), FENG Yanbin, ZHANG Haiyan, MA Zhaoyang, LI Jie, WANG Xinhui, WU Jiguang, YANG Wengang

State Key Laboratory of Advanced Refractories, Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2022-06-15 Published:2022-07-05
Contact: CAO Huiyan
About author:Cao Huiyan, born in 1982, obtained her master’s degree in 2008. She has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd. since 2008. She commits herself for advanced SiC series refractories research and market development for more than 10 years. As a senior engineer, she is skilled in technical services and engineering guidance for SiC products, especially Si₃N₄ bonded SiC applied in aluminum reduction cell sidewall and Si₃N₄/SiAlON bonded SiC applied in stack, belly and bosh liner, and also tuyere assembly brick or tuyere block of blast furnaces, CDQ (especially for inclined channel area), SiC Muffle in heat treatment furnaces, sintered SiC ceramic slurry pump and SiC products with excellent steam oxidation used in WTE incinerators. She has authored and co-authored about 40 papers.

Abstract

Abstract:

The mechanical force borne by the lintel and “brackets” in the inclined channel area of CDQ and the thermal stress generated by the top-down temperature gradient were simulated by ANSYS software. The following conclusions are drawn. (1) The mechanical force has very mild effect on the damage of the “brackets”. (2) The temperature gradient caused by the uneven temperature distribution of CDQ oven is the key factor affecting the “bracket” damage. The different expansion of refractory materials in various parts results in the thermal stress concentration which tears the “brackets”. (3) The structure adjustment of the “brackets” has very little effect on the thermal stress distribution. (4) The multi-phase nitride bonded silicon carbide for CDQ can effectively alleviate the stress concentration at the “brackets”, realizing the long-life and stable operation.

Key words: coke dry quenching oven, inclined channel area, ANSYS software, thermal stress, multi-phase nitrides, silicon carbide

CAO Huiyan, FENG Yanbin, ZHANG Haiyan, MA Zhaoyang, LI Jie, WANG Xinhui, WU Jiguang, YANG Wengang. Optimization and Simulation of Inclined Channel Area Lining for CDQ Ovens[J]. China's Refractories, 2022, 31(2): 24-29.

Figures/Tables 16

Fig. 1 Schematic diagram of thermodynamic simulation modeling

Fig. 2 Schematic diagram of mechanical force loading

Fig. 3 Schematic diagram of transformation results of thermal stress boundary conditions

Fig. 4 Thermodynamic simulation results of original structure

Fig. 5 Actual damage position

Fig. 6 Schematic diagram of optimization scheme I

Fig. 7 Thermodynamic simulation results of scheme I

Fig. 8 Schematic diagram of optimization scheme II

Fig. 9 Thermodynamic simulation results of scheme II

Fig. 10 Schematic diagram of optimization scheme III

Fig. 11 Thermodynamic simulation results of scheme III

Table 1 Simulation results of first round thermodynamic simulation

Comparison	Change	Result
Original structure and scheme I	“Bracket” inclination angle from 75.03° to 80.24°	Little effect on “bracket” stress; stress concentration hardly changes; maximum stress increases a little.
Original structure and scheme II	“Bracket” number from 36 to 30	Little effect on “bracket” stress; stress concentration moves upwards; maximum stress increases a lot.
Original structure and scheme III	“Bracket” inclination angle from 75.03° to 78.28°	Little effect on “bracket” stress; stress concentration hardly changes; maximum stress increases a lot.

Fig. 12 Simulation results of original structure considering only mechanical force

Fig. 13 Mechanical force simulation of scheme I

Fig. 14 Mechanical force simulation of scheme II

Fig. 15 Thermodynamic simulation of original structure adopting multiphase nitride bonded silicon carbide for CDQ ovens

References 11

[1]	Zhang Xiongfei, Liu Yuhu. Technical advantages and equipment innovation for high capacity CDQ plant. Fuel and Chemical Processes, 2020, 51(1): 25-27. (in Chinese)
[2]	Wu Jiguang, Huang Zhigang, Zhang Xinhua, Zhou Jiwei, Chang Cheng, Li Jie. Status and development of refractories in the chute area of CDQ furnace. Proceedings of 2014 National Ironmaking Production Technology Conference and Annual Ironmaking Academic Conference, Zhengzhou, China, 2014: 288-293. (in Chinese)
[3]	Wang Jiaping, Jin Guangxiang, Wang Yongfeng, Li Jie, Huang Zhigang, Wang Xinhui. Application and analysis of new multiphase nitride bonded silicon carbide refractories in inclined area of CDQ ovens. Proceedings of 2016 (10^th) Coking Energy Saving, Environmental Protection and CDQ Technology Seminar (in Chinese), Xi'an, China, 2016: 96-101. (in Chinese)
[4]	Wang Xinhui, Huang Jiayuan, Yang Fengling. Refractories selection for CDQ chamber and whole life cycle cost analysis. Refractories and Lime, 2019, 44(4): 10-14. (in Chinese)
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[6]	Cao Huiyan, Li Jie, Huang Zhigang, Wang Xinhui, Wu Jiguang. Effect of B₄C on CO corrosion resistance of multi-phase nitride bonded SiC materials. Naihuo Cailiao (Refractories, in Chinese), 2020, 54(6): 522-525.
[7]	Cao Huiyan, Li Jie, Huang Zhigang, Wang Xinhui, Wu Jiguang. Development and application of multiphase nitride bonded silicon carbide large lintel brick for CDQ ovens. Proceedings of 2018 (12^th) Coking Energy Saving, Environmental Protection and CDQ Technology Seminar (in Chinese), Dalian, China, 2018: 93-98 (in Chinese)
[8]	Huang Zhigang, Cao Huiyan, Li Jie, Wang Jiaping, Huang Yifei. Degradation mechanism of Si₃N₄ bonded SiC lintel bricks for dry quenching coke oven. Naihuo Cailiao (Refractories, in Chinese), 2019, 53(3): 175-179.
[9]	Li Jie, Cao Huiyan, Huang Zhigang. CO resistance of SiC refractories for CDQ furnace. Naihuo Cailiao (Refractories, in Chinese), 2019, 53(6): 464-467.
[10]	Wang Xibo, Xu Guotao, Liu Wei, Cai Guoqing, Wang Wenwen, Zhai Hongjun. Damage analysis of CDQ device and improvement of refractories. Naihuo Cailiao (Refractories, in Chinese), 2016, 50(5): 370-373.
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Optimization and Simulation of Inclined Channel Area Lining for CDQ Ovens

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