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Experimental and Computational Study of the Combustion Characteristics of Dual-Stage Lean Premixed Flame

Zhao, Wenhua, Liu, Li, Shen, Wenkai, Lyu, Yajin, Qiu, Penghua
Energy & fuels 2019 v.33 no.3 pp. 2547-2555
combustion, fuels, methane, nitric oxide, nitrogen dioxide, reaction mechanisms
A new type of flame organization, dual-stage lean premixed (DLP) combustion, is proposed. It constructs lean premixed flame with nonuniform equivalence ratio in the combustion zone, which is aimed at improving the load adaptability and ensuring low NOₓ emission of lean premixed combustor. The combustion characteristics of DLP flame were further studied through both experimental and calculation methods. The results showed that the laminarSMOKE code with detail reaction mechanism can accurately simulate the combustion state of DLP flame. Thermocouple measurement has a certain deviation from actual situation, but it still reflects the interaction inside DLP flame. Diffusion transport of CH₄ has an important influence on the combustion of secondary flame. NOₓ production in DLP flame can be significantly limited because of the abundant intermediates present in combustion zone, and the NO generated is mostly converted into NO₂.