骨料烘干煤粉燃烧器结构设计与性能分析

doi:10.3901/JME.2025.02.310

摘要/Abstract

摘要： 骨料烘干煤粉燃烧器结构与其内部流场密切相关，进而影响煤粉燃烧的效果及设备的燃烧性能。为分析燃烧器结构对煤粉燃烧效果的影响规律，运用可有效改善煤粉燃烧性能的旋流、稳燃及浓淡分离技术，设计了旋流式、旋流稳燃式、旋流浓淡分离式三种骨料烘干煤粉燃烧器结构，以煤粉燃烧效率和NO排放量为评价指标，数值模拟研究不同各次风控制参数下三种结构型式对燃烧性能的影响规律，并确定最佳煤粉燃烧器结构型式，基于此，搭建骨料烘干煤粉燃烧器试验台，并通过煤粉燃烧试验验证数值模拟的可靠性。研究表明，基于旋流技术和浓淡分离技术可极大提高骨料烘干煤粉燃烧器的燃烧效率及降低污染排放；各次风控制参数对三种型式燃烧器的燃烧效率及NO排放均产生影响，其中受影响最小的是旋流浓淡分离式燃烧器；旋流浓淡分离式骨料烘干煤粉燃烧器的性能优于旋流式与旋流稳燃式结构；由试验结果可知，旋流浓淡分离式燃烧器的NO排放量比旋流式燃烧器低31.4%。该研究为骨料烘干煤粉燃烧器煤粉燃烧机理研究提供了有效手段，为探究以煤粉为燃料的骨料烘干设备燃烧器结构提供了依据。

关键词: 骨料烘干, 煤粉燃烧器, 旋流, 稳燃, 浓淡分离

Abstract: The structure of aggregate drying pulverized coal burner correlates with its internal flow field, and further affects the pulverized coal combustion effect. The swirl, swirl-steady combustion and swirl-dense thin separation pulverized coal burner of aggregate drying were designed based on swirl, steady combustion and dense thin separation technology. The influence of pulverized coal burner structure on the burner performance based on pulverized coal combustion efficiency and NO emission as evaluation indexes under different air distribution parameters was investigated by numerical simulation. The optimum structure of pulverized coal burner was determined. Based on this, the aggregate drying pulverized coal combustion experiment was built, and the numerical simulation was verified by pulverized coal combustion tests. The results indicated that the combustion efficiency can be greatly improved and the emission can be reduced of aggregate drying pulverized coal burner using the swirl and dense thin separation approach. The air distribution parameters have a certain impact on the combustion efficiency and NO emission of the three types of burners, with the swirl-dense thin separation pulverized coal burner being the least affected. The performance of the swirl-dense thin separation pulverized coal burner is superior to that of swirl and swirl-steady combustion type. According to the test results, the NO emission of the swirl-dense thin separation pulverized coal burner is 31.4% lower than that of swirl burner. This study suggests an effective approach for the study of pulverized coal combustion mechanism of pulverized coal burner of aggregate drying, and provides a basis for exploring the burner structure of aggregate drying equipment using pulverized coal as fuel.

Key words: aggregate drying, pulverized coal burner, swirl, steady combustion, dense thin separation

中图分类号:

TQ534

程海鹰, 李旋, 高瑞发, 闫文刚, 胡志勇. 骨料烘干煤粉燃烧器结构设计与性能分析[J]. 机械工程学报, 2025, 61(2): 310-320.

CHENG Haiying, LI Xuan, GAO Ruifa, YAN Wengang, HU Zhiyong. Structural Design and Performance Analysis for Pulverized Coal Burner of Aggregate Drying[J]. Journal of Mechanical Engineering, 2025, 61(2): 310-320.

参考文献

[1] ZHANG Y N，CHEN H J，WANG K Z，et al. Effect of recycled aggregate gradation on the degree of blending and performance of recycled hot-mix asphalt (HMA)[J]. Journal of Cleaner Production，2023，398：136550.
[2] 张晨光，谢立扬，高岱乐，等. 厂拌热再生滚筒顺流与逆流加热工艺对比研究[J]. 华中科技大学学报，2020，48(11)：73-78. ZHANG Chenguang，XIE Liyang，GAO Daile，et al. Comparative study of parallel-flow and counter-flow heating process in rotary dryer for asphalt recycling plant[J]. Journal of Huazhong University of Science and Technology，2020，48(11)：73-78.
[3] ZHANG Y，CHENG H Y，LI J X，et al. Multi-objective structural optimization of a cyclone for an aggregate drying pulverised coal combustion device[J]. International Journal of Sustainable Energy，2020，39(5)：434-445.
[4] 谢立扬，张晨光，刘立强，等. 烘干筒表面传热过程与数值计算[J]. 中国公路学报，2016，29(3)：151-158. XIE Liyang，ZHANG Chenguang，LIU Liqiang，et al. Numerical calculation and process of heat transfer through surface of drying drum[J]. China Journal of Highway and Transport，2016，29(3)：151-158.
[5] Mehrin C，Islam M K，Arslan N I，et al. Design and performance analysis of a swirl pintle injector for a 1 MWth pressurized oxy-coal combustor[J]. Energy，2022，261(15)：125273.
[6] 张学泽，张维蔚，袁东辉，等. 具有周界风的煤粉燃烧器气流特性及结构研究[J]. 热力发电，2023，52(4)：151-158. ZHANG Xueze，ZHANG Weiwei，YUAN Donghui，et al. Study on flow characteristic and structure of pulverized coal burner with surrounding air[J]. Thermal Power Generation，2023，52(4)：151-158.
[7] 何翔，马达夫，金晶. 旋流对冲燃烧锅炉降低CO排放的燃烧优化[J]. 动力工程学报，2021，41(7)：533-541. HE Xiang，MA Dafu，JIN Jing. Combustion optimization for reducing CO emission in an opposed swirl firing boiler[J]. Journal of Chinese Society of Power Engineering，2021，41(7)：533-541.
[8] Hammad M B，Kashif A，Reyhane Y. Optimizing the effect of ignition and combustion on carbon oxidation using pulverized fuel burner[J]. Arabian Journal for Science and Engineering，2022，48(3)：3323-3337.
[9] 刘福国，郭新根. 空气分级炉膛煤粉燃烬模型及实炉试验对比[J]. 机械工程学报，2020，56(24)：208-218. LIU Fuguo，GUO Xingen. Pulverized coal burnout determination in furnace with air staging and it’s comparison with field test[J]. Journal of Mechanical Engineering，2020，56(24)：208-218.
[10] YAN R，ZHENG Z W，CHEN Z C，et al. The effect of the ratio of the secondary and tertiary air on the outlet velocity field of the new swirling pulverized coal burner[J]. Combustion Science and Technology，2023，195(6)：1221-1234.
[11] 郑鸿志，魏国华，宋民航，等. 一种新型中心富燃料直流煤粉燃烧器燃烧性能试验研究[J]. 中国电机工程学报，2023，43(6)：1-9. ZHENG Hongzhi，WEI Guohua，SONG Minhang，et al. Experimental study on combustion performance of a novel central fuel-rich direct current pulverized-coal burner[J]. Proceedings of the CSEE，2023，43(6)：1-9.
[12] 陈隆，王乃继. 29 MW高速煤粉燃烧器稳燃机理[J]. 煤炭学报，2021，46(增刊2)：1069-1076. CHEN Long，WANG Naiji. Stable mechanism of 29 MW high speed pulverized coal burner[J]. Journal of China Coal Society，2021，46(Suppl. 2)：1069-1076.
[13] SONG M H，HUANG Q，NIU F，et al. Recirculating structures and combustion characteristics in a reverse-jet swirl pulverized coal burner[J]. Fuel，2020，270(15)：117456.
[14] 关新河，李彦，朱群志，等. 1000 MW超超临界锅炉低NO_x燃烧器改造的数值模拟研究[J]. 中国电机工程学报，2019，39(8)：2376-2383，20. GUAN Xinhe，LI Yan，ZHU Qunzhi，et al. Numerical simulation study on retrofit of low NO_x burner for 1000 MW ultra-supercritical boiler[J]. Proceedings of the CSEE，2019，39(8)：2376-2383，20.
[15] TI Shuguang，CHEN Zhichao，LI Zhengqi，et al. Influence of different swirl vane angles of over fire air on flow and combustion characteristics and NO_x emissions in a 600 MWe utility boiler[J]. Energy，2014(74)：775-787.
[16] 周平，秦建柱，黄俊谐，等. LNASB型旋流燃烧器结构对锅炉NO_x排放及燃烧性能的影响[J]. 热力发电，2015，44(4)：82-87. ZHOU Ping，QIN Jianzhu，HUANG Junxie，et al. Influence of LNASB swirl burner structure on NO_xemission and combustion performance[J]. Thermal Power Generation，2015，44(4)：82-87.
[17] 清华大学. 浓淡返混式旋流煤粉燃烧器：CN201811471163.2[P]. 2020-05-01. Tsinghua University. Thick and thin back mixing swirl pulverized coal burner：CN201811471163.2[P]. 2020- 05-01.
[18] CHAE T，YANG W，RYU C，et al. Investigation of flame characteristics using various design parameters in a pulverized coal burner for oxy‐fuel retrofitting[J]. International Journal of Energy Research，2018，42(10)：3206-3217.
[19] 遆曙光，陈智超，蒋炳坤，等. 多次分级中心给粉旋流煤粉高效低氮氧化物燃烧技术[J]. 机械工程学报，2015，51(12)：146-152. TI Shuguang，CHEN Zhichao，JIANG Bingkun，et al. High efficient and low NO_x centrally fuel rich swirl burner with multi-stage combustion technology[J]. Journal of Mechanical Engineering，2015，51(12)：146-152.
[20] WANG J J，XIA L W，XU Y H，et al. Steady combustion test and numerical simulation analysis of a single direct-flow pulverized coal burner at low load[J]. IOP Conference Series：Earth and Environmental Science，2021，675(1)：012176.
[21] 陈登科，彭政康，闫永宏，等. 不同一次风浓淡比下半焦与烟煤混燃热态实验研究[J]. 动力工程学报，2020，40(8)：605-613. CHEN Dengke，PENG Zhengkang，YAN Yonghong，et al. Hot-state experiment on co-combustion of semi-char and bitominous coal under different primary air baias concentration ratios[J]. Journal of Chinese Society of Power Engineering，2020，40(8)：605-613.
[22] 沈涛，宋民航，夏良伟，等. 中心富燃料直流煤粉燃烧器燃烧及NO_x生成特性[J]. 洁净煤技术，2022，28(4)：151-159. SHEN Tao，SONG Minhang，XIA Liangwei，et al. Combustion and NO formation characteristics of a central fuel-rich direct current pulverized coal burner[J]. Clean Coal Technology，2022，28(4)：151-159.
[23] YAN R，CHEN Z C，ZHENG Y，et al. Influence of inner and outer secondary air ratio on flow and combustion characteristics of a swirl burner in a 29 MW pulverized coal boiler[J]. Energy，2021，237：121625.
[24] 程海鹰，李建新，张勇，等. 风速对骨料烘干煤粉燃烧器排放特性的影响[J]. 过程工程学报，2019，19(5)：1037-1046. CHENG Haiying，LI Jianxin，ZHANG Yong，et al. Effects of air velocity on emission characteristics of aggregate drying pulverized coal burner[J]. The Chinese Journal of Process Engineering，2019，19(5)：1037-1046.