峰谷形燃烧对炉内燃烧特性影响的数值模拟

doi:10.11930/j.issn.1004-9649.2017.07.079.06

摘要/Abstract

摘要： 为了深度降低燃煤锅炉的NO_x排放,需要对常规低NO_x燃烧方式做进一步优化。对某采用低NO_x燃烧技术的超超临界锅炉进行数值模拟,研究了“峰谷形燃烧”模式对炉内温度场、组分场、燃尽率和底渣量的影响,并与常规低NO_x燃烧模式进行了比较。结果表明：在保持还原区及燃尽区过量空气系数不变的前提下,“峰谷形燃烧”模式可以较常规低NO_x燃烧模式更进一步降低NO_x排放,不会对整个炉膛内的燃烧、温度分布、炉底渣量和煤粉的燃尽产生明显的影响;某优化工况下,炉膛出口NO_x含量可以较常规低NO_x燃烧模式深度降低达12%。

关键词: 峰谷形燃烧, 常规低NO_x燃烧, NO_x排放, 数值模拟

Abstract: In order to better reduce the NO_x emission of coal-fired boilers, it is necessary to optimize the conventional low NO_x combustion mode. The numerical simulation method is employed for an ultra-supercritical boiler with low NO_x combustion technology. The impacts of the peak-valley combustion mode on the temperature, the concentration field, the burnout rate and the slag volume are studied and compared with the conventional low NO_x combustion mode. The simulation and analysis results indicate that while keeping the excess air ratio of both the reduction zone and the burnout zone constant, the peak-valley combustion mode outperforms the conventional low-NO_x combustion mode in low NO_x combustion and has little effect on the combustion, the gas temperature, the bottom slag volume and the burnout rate. Under an optimal condition, the NO_x concentration in furnace exit cross section is reduced by 12%.

Key words: peak-valley combustion, conventional low NO_x combustion, NO_x emission, numerical simulation

中图分类号:

TK223

吕洪坤, 童家麟, 张明, 熊建国, 应明良, 齐晓娟, 余斌. 峰谷形燃烧对炉内燃烧特性影响的数值模拟[J]. 中国电力, 2017, 50(7): 79-84.

LÜ Hongkun, TONG Jialin, ZHANG Ming, XIONG Jianguo, YING Mingliang, QI Xiaojuan, YU Bin. Numerical Simulation on Effects of Peak-Valley Combustion Mode on Furnace Combustion Characteristics[J]. Electric Power, 2017, 50(7): 79-84.

导出引用管理器 EndNote|Ris|BibTeX

链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.2017.07.079.06

https://www.electricpower.com.cn/CN/Y2017/V50/I7/79

参考文献

[1] 童家麟,赵振宁,王晶晶,等. 国内强化燃烧、低NO x 直流燃烧器的发展[J]. 华北电力技术,2012（4）：1-6.
TONG Jialin, ZHAO Zhenning, WANG Jingjing, et al . Development of domestic low NO x direct-flow burners and enhanced combustion techniques[J]. North China Electric Power, 2012(4): 1-6.
[2] 禾志强,任耿华,祁利明. SCR烟气脱硝系统的负面影响研究[J]. 电站系统工程,2009,25（3）：47-50.
HE Zhiqiang, REN Genghua, QI Liming. Study on the disadvantageous influence of SCR denitrification system [J]. Power System Engineering, 2009, 25(3): 47-50.
[3] 郭斌,廖鸿楷,徐程宏,等. 我国SCR脱硝成本分析及脱硝电价政策探讨[J]. 热能动力工程,2010,25（4）：437-440.
GUO Bin, LIAO Hongkai, XU Chenghong, et al . Analysis of the SCR-based denitration cost in China and exploratory study of its policies on denitration electricity price [J]. Journal of Engineering for Thermal Energy and Power, 2010, 25(4): 437-440.
[4] 程星星,金宝升,钟文琪,等. SCR脱硝装置对锅炉内爆影响的数值模拟[J]. 燃烧科学与技术,2009,15（6）：551-556.
CHENG Xingxing, JIN Baosheng, ZHONG Wenqi, et al . Numerical simulation of influence of SCR denitration reactor on furnace implosion[J]. Journal of Combustion Science and Technology, 2009, 15(6): 551-556.
[5] 赵振宁,童家麟,叶学民,等. 燃尽风对300 MW锅炉燃烧特性影响的数值模拟[J]. 华东电力,2013,41（1）：214-219.
ZHAO Zhenning, TONG Jialin, YE Xuemin, et al . Numerical simulation on effects of over fire air on the combustion characteristics in 300 MW boiler[J]. East China Electric Power, 2013, 41(1): 214-219.
[6] 金晶,张忠孝,李瑞阳. 煤粉燃烧炉膛沿程NO x 释放规律的研究[J]. 中国电机工程学报,2006,26（1）：35-39.
JIN Jing, ZHANG Zhongxiao, LI Ruiyang. Study on the NO x release rule along boiler during pulverized coal combustion[J]. Proceedings of the CSEE, 2006, 26(1): 35-39.
[7] 张晓辉,孙锐,孙绍增,等. 立体分级燃烧对NO x 排放特性的影响[J]. 机械工程学报,2009,45（2）：199-205.
ZHANG Xiaohui, SUN Rui, SUN Shaozeng, et al . Effects of stereo-staged combustion technique on NO x emmision charactisctics[J]. Journal of Mechanical Engineering, 2009, 45(2): 199-205.
[8] 袁力,张殿平,余伟权,等. 新型M-PM低氮燃烧器在700 MW机组的改造效果[J]. 中国电力,2015,48（4）：61-65.
YUAN Li, ZHANG Dianping, YU Weiquan, et al . Application of new type of low NO x M-PM burner in 700 MW unit[J]. Electric Power, 2015, 48(4): 61-65.
[9] 李海滨. 低氮燃烧结合SCR脱硝方案论证分析[J]. 热力发电,2013,42（6）：17-20.
LI Haibin. Demonstration on scheme of low NO x combustion combined with SCR denitrification [J]. Thermal Power Generation,2013, 42(6): 17-20.
[10] 高小涛,高绥强,张恩先. 燃烧优化降低NO x 排放的试验研究[J]. 锅炉技术,2003,34（3）：74-76.
GAO Xiaotao, GAO Suiqiang, ZHANG Enxian. Testing research on reducing low-NO x emission of boiler by optimizing combustion[J]. Boiler Technology, 2003, 34(3): 74-76.
[11] 童家麟,赵振宁,叶学民,等. 过量空气系数对300 MW锅炉炉内煤粉燃烧过程影响的数值模拟[J]. 华北电力技术,2012（8）：30-33.
TONG Jialin, ZHAO Zhenning, YE Xuemin, et al . Numerical simulation on effects of excess air ratio on the combustion in 300 MW boiler [J]. North China Electric Power, 2012(8): 30-33.
[12] 谢建文,范卫东,章明川. 基于神华煤NO x 排放特性的新煤粉经济细度研究[J]. 中国电力,2008,41（11）：38-41.
XIE Jianwen, FAN Weidong, ZHANG Mingchuan. Study on the new pulverized coal economical fineness based on the NO x emission characteristics of Shenhua coal[J]. Electric Power, 2008, 41(11): 38-41.
[13] PARTT D T, SMOOT L D. Pulverized coal combustion and gasification [M]. New York: Plenum Press, 1979.
[14] 吕洪坤,吴常苗,张明,等. 一种用于降低NO x 排放的配风耦合燃烧方法及系统：10384712.3[P]. 2015-10-21.
[15] 吕洪坤,童家麟,刘建忠,等. 1 000 MW超超临界锅炉高温腐蚀分析及对策[J]. 北京工业大学学报,2017,43（3）：481-488.
LÜ Hongkun, TONG Jialin, LIU Jianzhong, et al . Analysis and solution of high-temperature corrosion for a 1 000 MW ultra- supercritical boiler[J]. Journal of Beijing University of Technology, 2017, 43(3): 481-488.
[16] 邓中乙,余永生,谢红,等. 二次风偏转对减轻超超临界墙式锅炉高温腐蚀数值模拟[J]. 中国电力,2015,48（1）：47-51.
DENG Zhongyi, YU Yongsheng, XIE Hong, et al . Numerical simulation of high-temperature corrosion reduction by deflected secondary air in a tangentially fired ultra supercritical boiler [J]. Electric Power, 2015, 48(1): 47-51.
[17] 赵振宁,张清峰,赵振宙. 电站锅炉性能试验原理方法及计算[M]. 北京：中国电力出版社,2010.