Scale Effect of Ceramic Foam Burner on the Combustion Characteristic of Low Concentration Coal Mine Methane
The apparatus of low concentration coal mine methane (LCM) combustion,from experimental scale to industrial scale,is necessary for the large volume of LCM.In this paper,an experimental system has been set up for the LCM combustion to validate the corresponding numerical model.Following this,the revised burner,with increased inlet diameter and burner length,was used to study the combustion characteristic numerically based on the reliable model.Results indicated that the temperature distribution shows one-dimension evidently and the temperature discrepancy among different inlet diameters is negligible with the adiabatic wall.However,the temperature discrepancy is apparent when the heat loss of the wall is considered,which exhibits the importance of heat preservation outside the burner wall.As the burner diameter increases,the total temperature increases and appears to be more homogeneous with the heat loss wall.In addition,NO emissions decrease gradually and CO emissions increase rapidly with the increasing of the diameter.When the inlet diameter triples,the NO emissions decrease by 31.4% and the CO emissions increase by a factor of 11.With the increasing of the burner length,the temperatur ENREF 1e,NO emissions and CO emissions at the burner outlet decrease when the heat loss of the wall wasn’t ignored.And the NO emissions and CO emissions decrease by 18.6% and 22.7-fold respectively when the length triples.The velocity limit of different equivalence ratios,together with the temperature distribution and pollutant emission at different scales,should be considered systematically when the large scale burners are designed.
ceramic foam scale up low concentration coal mine methane combustion characteristic
DAI Huaming LIN Baiquan
School of Safety Engineering, China University of Mining and Technology;State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
国内会议
上海
英文
1-16
2014-11-11（万方平台首次上网日期，不代表论文的发表时间）