NH_(3)/CH_(4)/CH_(3)OH多孔介质燃烧特性模拟研究  

Simulation on NH_(3)/CH_(4)/CH3OH Porous Media Combustion

作　　者：李亮[1] 张瑞方 张扬[1] 张海[1] LI Liang;ZHANG Ruifang;ZHANG Yang;ZHANG Hai(State Key Laboratory for Thermal Science and Power Engineering(Department of Energy and Power Engineering,Tsinghua University),Haidian district,Beijing 100084,China)

机构地区：[1]热科学与动力工程重点实验室(清华大学能源与动力工程系),北京市海淀区100084

出　　处：《中国电机工程学报》2024年第1期174-181,I0014,共9页Proceedings of the CSEE

基　　金：国家重点研发计划项目“近极限层流燃烧特性与液体燃料燃烧研究”(2021YFA0716201)。

摘　　要：氨(NH_(3))是一种无碳燃料,有望作为热能发电的替代燃料降低碳排放。多孔介质燃烧是一种可提高燃烧速率和稳定性的燃烧技术,实验表明其用于氨与反应性更强的燃料进行混燃可以同时提高燃烧强度和燃烧稳定性,但缺乏相应的模型研究。该文基于多孔介质导热强度高的特性,其内部燃烧满足一维假设,建立了一维多孔介质燃烧模型,对NH_(3)分别与甲烷(CH_(4))、甲醇(CH_(3)OH)掺混时的燃烧特性进行模型计算。计算结果显示多孔介质对两种混合燃料的作用不同,对于CH_(4)/NH_(3)燃料,多孔介质可以明显提高燃烧速率并降低富燃状态的NH_(3)残留;对于CH_(3)OH/NH_(3)燃料,提高燃烧速率和降低NH_(3)残留的效果较差;对两种混合燃料,可燃气体预混后直接送入多孔介质燃烧都增加一定的NOx排放,增加效果相同,而分级燃烧可以显著降低NOx排放。As a carbon-free fuel,ammonia(NH_(3))is considered as an alternative fuel for thermal power generation to reduce carbon emission.Previous experimental studies show that porous media combustion,a technology that has been proved to be effective to enhance the combustion intensity and stability for low caloric fuels,can be applied to NH_(3) co-firing with more reactive fuel.However,the modelling study with careful consideration of heat transfer and chemical reaction is lacked.Based on the characteristic of high thermal conductivity of porous media,a one-dimensional model is established to simulate the combustion characteristics of NH_(3) blended with methane(CH_(4))and methanol(CH_(3)OH)in porous media.The results show that the porous media has different effects on the two co-fired fuels.For CH_(4)/NH_(3) fuel,the porous media significantly increases the burning rate and reduce the NH_(3) residue in the fuel-rich condition.For CH_(3)OH/NH_(3) fuel,however,the effect of increasing burning rate and reducing NH_(3) residue is insignificant.For both co-fired fuels,the porous media combustion increases NOx emission in a similar extent,while using air stage combustion significantly reduces NOx emission.

关 键 词：多孔介质 氨燃烧 模拟研究 燃烧速率 NOX排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]