摘要
针对生物质气化耦合煤粉低氮燃烧发电技术,考虑该技术包括煤粉和生物质气化燃气两类燃料特点,开发基于ED湍流燃烧模型的CFD数值模拟框架,建立了新型焦炭燃烧与气化模型和气相组分燃烧模型,进一步讨论了煤焦燃烧气化模型中离散项与连续相之间的质量、组分、动量和热量的耦合方法。在此基础上,通过编写UDF将新模型添加到商业CFD计算软件Fluent平台上,并对模型进行了验证。然后将所开发的模型和数值方法应用于600MW超临界对冲火焰锅炉的生物质气化耦合煤粉低氮燃烧的数值模拟,计算结果表明,新的模型可以非常合理的计算旋流燃烧器区域及炉膛前后墙、侧墙上的温度及浓度分布。文中所开发的CFD数值模拟框架、焦炭燃烧气化模型和气相组分燃烧模型以及数值实现方法,可以用于生物质气化耦合煤粉低氮燃烧发电技术的设计与优化。
A new CFD numeric modelling frame based on ED turbulent-combustion model was developed, focusing on low NOx combustion of pulverized coal coupling with biomass syngas and considering the different characteristic of pulverized coal and biomass syngas. The char burning and gasification model as well as the coupling method between the disperse phase and continuous phase was built, the transfer of mass, species, momentum, and energy between discrete and continuous phases was discussed. The developed model and coupling method were implemented into Fluent by making user defined function （UDF） file. The new prediction model was then applied in the CFD simulation of a 600MW supercritical opposite-fired boiler coupling with biomass syngas. Results show that the new model can reasonably predict the temperature and species concentrations distribution in the swirl burner zone and on the furnace walls. This means the new prediction model can give good instructions on boiler＇s operation and design optimization for biomass syngas co-firing.
作者
李振山
陈登高
张志
张定海
孔红兵
韦耿
LI Zhenshan;CHEN Denggao;ZHANG Zhi;ZHANG Dinghai;KONG Hongbing;WEI Geng(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education （Tsinghua University）, Haidian District, Beijing 100084, China;Key Laboratory for Clean Combustion and Flue Gas Purification of Sichuan Province （Dongfang Boiler Co., Ltd., Dongfang Electric Group）, Zigong 643099, Sichuan Province, China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第7期2032-2045,共14页
Proceedings of the CSEE
基金
四川省省院省校合作项目(2017JZ0002)~~
关键词
生物质气化燃气
煤粉低氮燃烧
数值模拟
biomass gasification syngas
low NOx combustion of pulverized coal
CFD simulation
