Numerical simulation of pulverized coal combustion and calcium carbonate decomposition coupling and NO<sub><em>x</em></sub> generation in swirl precalciner

化学工业与工程

Chemcial Industry and Engineering

2025, Vol. 42

Issue (2) :177-186 DOI: 10.13353/j.issn.1004.9533.20230115

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Numerical simulation of pulverized coal combustion and calcium carbonate decomposition coupling and NO_x generation in swirl precalciner

LI Quanliang¹, HE Feng², MEI Shuxia¹, XIE Junlin², ZHANG Chao³, DENG Yuhua³

1. School of Material Science and Engineering, Wuhan University of Technology, Hubei, Wuhan 430070, China;
2. School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
3. CBMI Construction Co., Ltd., Beijing 100176, China

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Abstract Aiming at a new type of swirl precalciner, numerical simulations were carried out for the pulverized coal combustion, raw meal decomposition coupling, and NO_x generation processes. In Euler coordinate system gas phase was expressed with the Realizable k-ε two-equation model, in Lagrange coordinate system solid phase was expressed with the discrete phase model(DPM),pulverized coal combustion and raw meal decomposition was expressed with the species transport model,radiation was expressed with the P-1 model, NO_x generation was expressed with the pollutant model. Thermal NO_x and fuel NO_x generation are considered. The results show that the tertiary air mainly moves upward along the wall spiral, while the flue gas mainly moves the central axis spiral in the precalciner. When the pulverized coal enters the precalciner, the volatiles are rapidly released and burned, and then the char continues to burn, and its main combustion area is near the shell. When the pulverized coal enters the precalciner, the volatiles are rapidly released and burned, and then the char continues to burn, and its main combustion area is near the shell, and the combustion residence time is approximately 5.9 s. The raw meal decomposes rapidly after entering the precalciner. When reaching a height of 50 m in the precalciner, the decomposition rate of CaCO₃ reaches 90%. At this point, the decomposition times for the lower and upper raw meal are approximately 6.5 s and 4.7 s, respectively. 92.32% decomposition of calcium carbonate at the outlet. Due to the poor coupling between pulverized coal combustion and raw meal decomposition at the shell, local high temperatures are formed at the wall, which makes the NO_x generation rate larger, and the NO_x at the outlet reaches 1.251×10^-3, which needs to be improved.

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	LI Quanliang
	HE Feng
	MEI Shuxia
	XIE Junlin
	ZHANG Chao
	DENG Yuhua

Keywords： precalciner coal combustion calcium carbonate decomposition NO_x numerical simulation computational fluid dynamics

Received 2023-03-01;

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LI Quanliang, HE Feng, MEI Shuxia, XIE Junlin, ZHANG Chao, DENG Yuhua.Numerical simulation of pulverized coal combustion and calcium carbonate decomposition coupling and NO_x generation in swirl precalciner[J] Chemcial Industry and Engineering, 2025,V42(2): 177-186

[1] 中华人民共和国国家统计局. 中国统计年鉴[M]. 北京: 中国统计出版社, 2022
[2] RAHMAN A, RASUL M G, KHAN M M K, et al. Recent development on the uses of alternative fuels in cement manufacturing process[J]. Fuel, 2015, 145: 84-99
[3] BENHELAL E, SHAMSAEI E, RASHID M I. Challenges against CO₂ abatement strategies in cement industry: A review[J]. Journal of Environmental Sciences, 2021, 104: 84-101
[4] 彭宝利. 新型干法水泥生产工艺及设备[M]. 武汉: 武汉理工大学出版社, 2017 PENG Baoli. New dry process cement production technology and equipment[M]. Wuhan: Wuhan University of Technology Press, 2017(in Chinese)
[5] 沈伟强. NST型窑尾分解炉NO_x控制研究[D]. 武汉: 武汉理工大学, 2020 SHEN Weiqiang. Study on NO_x control of NST type calciner[D].Wuhan: Wuhan University of Technology, 2020 (in Chinese)
[6] 梅书霞, 谢峻林, 何峰, 等. DD分解炉燃烧与分解耦合过程的数值模拟[J]. 化工学报, 2013, 64(3): 897-905 MEI Shuxia, XIE Junlin, HE Feng, et al. Numerical simulation of coupling mechanism between pulverized coal combustion and calcium carbonate decomposition in double-sprayed precalciner[J]. CIESC Journal, 2013, 64(3): 897-905(in Chinese)
[7] 梅书霞, 谢峻林, 何峰, 等. DD分解炉改变生料进口位置的数值模拟[J]. 武汉理工大学学报, 2012, 34(9): 26-30 MEI Shuxia, XIE Junlin, HE Feng, et al. Numerical simulations in double-sprayed precalciner by changing the location of raw meal inlets[J]. Journal of Wuhan University of Technology, 2012, 34(9): 26-30(in Chinese)
[8] 张三梅. DD分解炉分级燃烧减排NO_x的数值模拟及优化研究[D]. 武汉: 武汉理工大学, 2012 ZHANG Sanmei. Numerical simulation of low-NO_x staging combustion and optimization research in DD prcealciner[D]. Wuhan: Wuhan University of Technology, 2012 (in Chinese)
[9] 石向前. 不同喷煤位置对KDS型分解炉NO_x的形成及生料分解率的影响[D]. 四川绵阳: 西南科技大学, 2020 SHI Xiangqian. The effect of different coal injection locations on NO_x formation and raw meal decomposition rate in KDS precalciner[D].Sichuang Mianyang: Southwest University of Science and Technology, 2020 (in Chinese)
[10] YA M, CHEN Z. Simulation on NOx generation of RSP calciner for cement production[J]. Advanced Materials Research, 2012, 535/536/537: 1647-1651
[11] 汤帅. DDF分解炉流场及SNCR法降低NO_x的数值模拟研究[D]. 武汉: 武汉理工大学, 2016 TANG Shuai. Numerical simulations of the flow field and SNCR denitrification process on DDF precalciner[D].Wuhan: Wuhan University of Technology, 2016 (in Chinese)
[12] 刘定平, 刘轶豪. 水泥分解炉掺烧污泥NO_x排放特性的模拟与优化[J]. 工程热物理学报, 2021, 42(11): 3001-3008 LIU Dingping, LIU Yihao. Simulation and optimization of NO_x emission characteristics of co-combustion of coal and sludge in cement precalciner[J]. Journal of Engineering Thermophysics, 2021, 42(11): 3001-3008(in Chinese)
[13] NAKHAEI M, WU H, GRÉVAIN D, et al. CPFD simulation of petcoke and SRF co-firing in a full-scale cement calciner[J]. Fuel Processing Technology, 2019, 196: 106153
[14] MIKUL?I? H, VON BERG E, VUJANOVI? M, et al. Numerical evaluation of different pulverized coal and solid recovered fuel co-firing modes inside a large-scale cement calciner[J]. Applied Energy, 2016, 184: 1292-1305
[15] MEI S, XIE J, CHEN X, et al. Numerical simulation of the complex thermal processes in a vortexing precalciner[J]. Applied Thermal Engineering, 2017, 125: 652-661
[16] 梅书霞, 谢峻林, 陈晓琳, 等. 涡旋式分解炉内煤粉与RDF共燃过程中的交互影响[J]. 硅酸盐通报, 2016, 35(12): 4054-4059, 4081 MEI Shuxia, XIE Junlin, CHEN Xiaolin, et al. Co-combustion interaction of coal and refuse derived fuel in a swirl-type precalciner[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(12): 4054-4059, 4081(in Chinese)
[17] 陈晓琳, 梅书霞, 谢峻林, 等. 两种带涡流室分解炉内气相流场的模拟对比研究[J]. 化学工业与工程, 2014, 31(6): 53-58 CHEN Xiaolin, MEI Shuxia, XIE Junlin, et al. Numerical simulation study on gas-flow field in two kinds of precalciner with the swirl chamber[J]. Chemical Industry and Engineering, 2014, 31(6): 53-58(in Chinese)
[18] 梅书霞, 谢峻林, 陈晓琳, 等. 涡旋式分解炉中煤及垃圾衍生燃料共燃烧耦合CaCO₃分解的数值模拟[J]. 化工学报, 2017, 68(6): 2519-2525 MEI Shuxia, XIE Junlin, CHEN Xiaolin, et al. Numerical simulation of co-combustion of coal and refuse derived fuel in coupling with decomposition of calcium carbonate in precalciner with swirl type prechamber[J]. CIESC Journal, 2017, 68(6): 2519-2525(in Chinese)
[19] SHIH T H, LIOU W W, SHABBIR A, et al. A new k-ε eddy viscosity model for high Reynolds number turbulent flows[J]. Computers & Fluids, 1995, 24(3): 227-238
[20] MAO Y, ZHANG D, CHEN Z, et al. Numerical modelling of multiphase FLOW and calcination process in an industrial calciner with fuel of heavy oil[J]. Powder Technology, 2020, 363: 387-397
[21] YANG Y, ZHANG Y, LI S, et al. Numerical simulation of low nitrogen oxides emissions through cement precalciner structure and parameter optimization[J]. Chemosphere, 2020, 258: 127420
[22] ZHU J, KAO H. Numerical simulation of co-combustion of pulverized coal and different proportions of refused derived fuel in TTF precalciner[J]. Journal of Renewable Materials, 2021, 9(7): 1329-1343
[23] WU C, NANDAKUMAR K, BERROUK A S, et al. Enforcing mass conservation in DPM-CFD models of dense particulate flows[J]. Chemical Engineering Journal, 2011, 174(1): 475-481
[24] MAGNUSSEN B F, HJERTAGER B H. On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion[J]. Symposium (International) on Combustion, 1977, 16(1): 719-729
[25] SPALDING D B. Mixing and chemical reaction in steady confined turbulent flames[J]. Symposium (International) on Combustion, 1971, 13(1): 649-657
[26] BADZIOCH S, HAWKSLEY P G W. Kinetics of thermal decomposition of pulverized coal particles[J]. Industrial & Engineering Chemistry Process Design and Development, 1970, 9(4): 521-530
[27] BAUM M M, STREET P J. Predicting the combustion behaviour of coal particles[J]. Combustion Science and Technology, 1971, 3(5): 231-243
[28] FIELD M A. Rate of combustion of size-graded fractions of char from a low-rank coal between 1 200 K and 2 000 K[J]. Combustion and Flame, 1969, 13(3): 237-252
[29] SAZHIN S S, SAZHINA E M, FALTSI-SARAVELOU O, et al. The P-1 model for thermal radiation transfer: Advantages and limitations[J]. Fuel, 1996, 75(3): 289-294