少油点火燃烧器运行优化数值模拟

doi:10.11930/j.issn.1004-9649.201604158

摘要/Abstract

摘要： 对用于330 MW锅炉的少油点火燃烧器建立了精细的物理模型,建模包括了一次风和周界风流动区域以及燃烧器壁厚区域。对燃用烟煤点火情况下燃烧器内部复杂区域的流动、燃烧以及流固耦合传热进行三维数值模拟,比较油枪燃油量对燃烧器点火性能以及壁面温度的影响,对燃油量进行了优化。监测点壁面温度模拟值与实际测量值符合较好。计算结果表明,适当降低燃油量不仅不影响点火性能,还可以降低燃烧器壁面温度。实际运行结果表明,在油量为80 kg/h时燃烧器出口平均温度和最高温度有所下降,各项指标和参数正常,满足成功点火的需要。

关键词: 燃煤发电机组, 少油点火燃烧器, 烟煤, 油量优化, 数值模拟

Abstract: A precise physical model is developed for the tiny-oil ignition burner in a 330 MW tangentially-fired boiler, including the primary air, the surrounding air and the burner thick wall areas. The three dimensional numerical simulation on the fluid flow process, combustion and fluid-solid coupled heat transfer in these areas are conducted under the bituminous coal combustion conditions. The effects of oil gun flow rate on the ignition performance and the wall temperature are carefully analyzed for the oil flow rate optimization. The calculated temperature matches well with the measured value at the monitoring points. The calculated results show that appropriate oil flow rate reduction not only has little side effect on the ignition performance, but also can lower the wall temperature of the burner. Theoretically the oil flow rate should be kept at 70 kg/h as the minimum requirement for the coal type of the boiler. In practical operation it can be adjusted to 80 kg/h to ensure sufficient secure margin. According to the practical operation data, with the oil flow rate at 80 kg/h, although the maximum and average temperatures at the burner exit have all been somewhat decreased, the operation parameters and indices of the boiler still remain normal and meet all the requirements for successful ignition.

Key words: tiny-oil ignition burner, bituminous coal, oil flow rate optimization, numerical simulation

中图分类号:

TM227.7

黄香彬, 汪华剑, 白鹏, 严响林. 少油点火燃烧器运行优化数值模拟[J]. 中国电力, 2017, 50(10): 104-109.

HUANG Xiangbin, WANG Huajian, BAI Peng, YAN Xianglin. Numerical Simulation on the Operation Optimization of Tiny Oil Ignition Burner[J]. Electric Power, 2017, 50(10): 104-109.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201604158

https://www.electricpower.com.cn/CN/Y2017/V50/I10/104

参考文献

[1] 李新梦,姚磊,李传统. 富氧微油点火燃烧器的数值实验研究[J]. 电站系统工程,2008,24(1)：19-20,23.
LI Xinmeng, YAO Lei, LI Chuantong. Numerical simulation of ignition with less oil in abundant oxygen[J]. Power System Engineering, 2008, 24(1): 19-20, 23.
[2] 李文蛟. 感应式加热煤粉锅炉无油直接点火燃烧器的基础和试验研究[D]. 杭州：浙江大学,2000.
[3] 陈磊. 煤粉炉少油点火技术数值模拟及应用研究[D]. 上海：上海交通大学,2011.
[4] 周俊虎,聂欣,周志军,等. 无油点火燃烧器的数值试验研究[J]. 中国电机工程学报,2004,24(9)：243-247.
ZHOU Junhu, NIE Xin, ZHOU Zijun, et al . Numerical simulation of oil-free ignition combustor[J]. Proceedings of the CSEE, 2004, 24(9): 243-247.
[5] 李路明. 微油点火水平浓淡煤粉燃烧器数值模拟及应用[J]. 电站系统工程,2014,30(4)：23-25.
LI Luming. Numerical simulation and application of minimum oil gun horizontal bias combustion burner[J]. Power System Engineering, 2014, 30(4): 23-25.
[6] 陈磊,范浩杰,吴磊,等. 煤粉燃烧器使用少油点火技术的数值模拟[J]. 动力工程学报, 2011,31(3)：165-169.
CHEN Lei, FAN Haojie, WU Lei, et al . Numerical simulation on tiny-oil ignition technology for pulverized-coal burners [J]. Journal of Power Engineering, 2011, 31(3): 165-169.
[7] 丁历威,李凤瑞. 微油点火燃烧器建模及数值计算方法的研究[J]. 浙江电力,2010,29(8)：18-21.
DING Liwei, LI Fengrui. A study on modeling and numerical calculation methods of tiny oil ignition burner[J]. Zhejiang Electric Power, 2010, 29(8): 18-21.
[8] 池作和,孙公钢. 微油点火燃烧器一级燃烧室结构数值模拟研究[J]. 热力发电,2007,36(11)：20-24.
CHI Zuohe, SUN Gonggang. Study on numerical simulation of first-stage firing chamber structure in oil-saving ignition burner [J]. Thermal Power Generation, 2007, 36(11): 20-24.
[9] 付忠广,王志鹏,史亮亮. 燃煤锅炉微油点火燃烧器的数值计算分析[J]. 工程热物理学报,2008,29(4)：609-612.
FU Zhongguang, WANG Zhipeng, SHI Liangliang. Numerical simulation of the tiny-oil ignition burner in the coal fired boiler[J]. Journal of Engineering Thermophysics, 2008, 29(4): 609-612.
[10] 李路明,陈力哲,孙锐,等. 水平浓淡微油点火煤粉燃烧器燃烧过程数值模拟及工业应用[J]. 电力建设. 2008,29(8)：7-12.
LI Luming, CHEN Lizhe, SUN Rui, et al . Numerical simulation and industrial application of combustion process of horizontal bias less-oil ignited pulverized-coal burner[J]. Electric Power Construction, 2008, 29(8): 7-12.
[11] 郭永浩,孙学信. 稳燃腔燃烧器少油点火的研究与应用[J]. 中国电力,2003,36(10)：25-28.
GUO Yonghao, SUN Xuexin. Study and application of pulverized coal ignition with little oil by using stabilized combustion cavity burners [J]. Electric Power, 2003, 36(10): 25-28.
[12] FU Weibiao, ZHANG Yanping, HAN Hongqiao, et al . A general model of pulverized coal devolatilization[J]. Fuel, 1989, 68(4): 505-510.
[13] LIU Chunlong, LI Zhengqi, ZHAO Yang, et al . Influence of coal-feed rates on bituminous coal ignition in a full-scale tiny-oil ignition burner [J]. Fuel, 2010, 89(7): 1690-1694.
[14] LIU Chunlong, ZHU Qunyi, Li Zhengqi, et al . Influence of different oil feed rate on bituminous coal ignition in a full-scale tiny-oil ignition burner[J]. Frontiers in Energy, 2013, 7(3): 406-412.
[15] ZHOU Hao, Mo Guiyuan, YANG Yu, et al . Numerical investigation of gas-solid two-phase flow in a tiny-oil ignition cyclone burner for a 300 MW down-fired pulverized coal-fired boiler [J]. Journal of Energy Engineering, 2014, 140(1): 1-11.
[16] LI Zhengqi, LIU Chunlong, ZHU Qunyi, et al . Experimental studies on the effect of the pulverized coal concentration on lean-coal combustion in a lateral-ignition tiny-oil burner[J]. Energy & Fuels, 2010, 24(24): 4161-4165.