华电技术 ›› 2020, Vol. 42 ›› Issue (10): 64-72.

• 燃烧与混燃 • 上一篇    下一篇

大比例半焦煤粉掺混燃烧排放数值模拟研究

  

  1. 1. 哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001;2. 哈尔滨电气国际工程有限责任公司,哈尔滨 150000;3. 宁德时代新能源科技股份有限公司,福建 宁德 352100
  • 出版日期:2020-10-25

Numerical study of the emission from co-combustion of large-proportion semi-coke and pulverized coal

  1. 1.School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;2.Harbin Electric International Company Limited,Harbin 150000,China;3.Contemporary Amperex Technology Company Limited,Ningde 352100,China
  • Published:2020-10-25

摘要: 半焦是原煤经过干馏后得到的产物,具有高热值、低挥发分的特点。现阶段作为煤化工副产品的半焦并未
得到充分使用,研究半焦与煤粉的掺混燃烧有助于提高经济效益,而掺混燃烧的难点在于半焦的着火条件较差、燃
尽率低、NOx排放质量浓度高。采用数值模拟方法研究了半焦与煤粉大比例掺混燃烧条件下,给粉方式、掺混比、二
次风配风方式对炉膛内的温度场、NO 质量分数场和 CO 质量分数场分布的影响。结果表明:均匀配风给粉条件下,
半焦的最佳掺混比例为 40%;燃料分层时半焦布置在上部燃烧器会导致炉内温度和 NO 质量分数激增,但可以通过
改变二次风配风来改善。

关键词: 半焦, 大比例掺混, 数值模拟, 给粉方式, 掺混比, 二次风配风, NOx排放

Abstract: Semi-coke is a product obtained from dry distillation of raw coal,and is of high calorific value and low volatile
content. At present,semi-coke,as a by-product of coal chemical industry,has not been fully utilized.Studying the blending
and co-combustion of semi-coke with pulverized coal will improve its economic benefit. However,the difficulties of the co-
combustion lay on the poor ignition conditions,low burnout rate and high NOx emission.In the study on co-combustion of
pulverized coal blended with large-proportion semi-coke,the effect of coal powder feeding method,blending ratio and
secondary air distribution on the temperature field,NO mass fraction field and CO mass fraction field in a furnace was
analyzed by numerical simulation.The results show that the optimal blending ratio of semi-coke is 40%;under the condition
of even air and powder distribution. When the fuel is stratified,the semi-coke arranged on the upper part of the burner will
make furnace temperature and NO mass fraction soar ,which can be improved by optimize the secondary air distribution .

Key words: semi-coke, large-proportion blending, numerical simulation, powder feeding method, blending ratio,
secondary air distribution,
NOx emissions