Improved combustion stability of biogas at different CO_(2) concentrations using inhomogeneous partially premixed stratified flames  

作　　者：Mohy Saad Mansour Maged Kiriakos Lili Hao Mohamed Amr Serag-Eldin 

机构地区：[1]Mechanical Power Engineering Department,Cairo University,1 Gamaa Street,Cairo Governorate 12613,Egypt [2]Mechanical Engineering Department,The American University in Cairo,AUC Ave,Cairo Governorate 11835,Egypt [3]College of Electrical Engineering and Control Science,Nanjing Tech University,Nanjing 211816,P.R.China

出　　处：《Global Energy Interconnection》2024年第4期486-502,共17页全球能源互联网（英文版）

基　　金：funded by the American University in Cairo research grants(Project number SSE-MENG-M.M.-FY18-FY19-FY20-RG(1-18)–2017-Nov-11-17-52-02).

摘　　要：Biogas is a renewable and clean energy source that plays an important role in the current environment of lowcarbon transition.If high-content CO_(2) in biogas can be separated,transformed,and utilized,it not only realizes high-value utilization of biogas but also promotes carbon reduction in the biogas field.To improve the combustion stability of biogas,an inhomogeneous,partially premixed stratified(IPPS)combustion model was adopted in this study.The thermal flame structure and stability were investigated for a wide range of mixture inhomogeneities,turbulence levels,CO_(2) concentrations,air-to-fuel velocity ratios,and combustion energies in a concentric flow slot burner(CFSB).A fine-wire thermocouple is used to resolve the thermal flame structure.The flame size was reduced by increasing the CO_(2) concentration and the flames became lighter blue.The flame temperature also decreased with increase in CO_(2) concentration.Flame stability was reduced by increasing the CO_(2) concentration.However,at a certain level of mixture inhomogeneity,the concentration of CO_(2) in the IPPS mode did not affect the stability.Accordingly,the IPPS mode of combustion should be suitable for the combustion and stabilization of biogas.This should support the design of highly stabilized biogas turbulent flames independent of CO_(2) concentration.The data show that the lower stability conditions are partially due to the change in fuel combustion energy,which is characterized by the Wobbe index(WI).In addition,at a certain level of mixture inhomogeneity,the effect of the WI on flame stability becomes dominant.

关 键 词：BIOGAS Renewable energy Effect of CO_(2) Combustion stability Burner design Renewable fuels Partial premixed 

分 类 号：S216.4[农业科学—农业机械化工程] TK6[农业科学—农业工程]