Counterflow diffusion flame of hydrogen-enriched biogas under MILD oxy-fuel condition
Counterflow diffusion flame of hydrogen-enriched biogas under MILD oxy-fuel condition
复制标题
MILD富氧燃料条件下富氢沼气逆流扩散火焰
DOI：
10.1016/j.ijhydene.2011.09.002
复制
发表时间：
2011-11-01
影响因子：
7.2
通讯作者：
Zheng, Chuguang
中科院分区：
文献类型：
--
作者：
Chen, Sheng;Zheng, Chuguang
沼气是常见的可再生燃料。同时，由于它们的低热值很小，并且升级的诱导成本很高，因此它们很难被经济地利用。为了克服上述不足，本文讨论了在作者最近提出的温和富氧操作下利用生物酶的可行性。本文以一种常用的逆流式结构为研究原型。采用格子Boltzmann方法（LBM）研究了在新的燃烧条件下，混合氧化剂预热温度、混合氧化剂中氧浓度和混合燃料中氢浓度对生物气反应结构的影响。通过数值模拟发现，即使在氧化剂预热温度较低、氧化剂流中氧浓度极高、混合燃料中氢添加量很少的情况下，以沼气为燃料的温和富氧燃烧也能持续进行，这为开发新的方案应对CO2排放带来的挑战提供了坚实的理论基础。此外，我们的发现意味着流行的小火焰方法的故障，并强调迫切需要开发新的湍流燃烧模型，这种新的燃烧策略。版权所有（C）2011，氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Biogases are commonly found renewable fuels. Meanwhile they are difficult to be economically utilized because their low calorific values are very small and the induced costs of upgrading are expensive. To overcome the above deficiencies, in this paper we discuss the feasibility to utilize biogases under the MILD oxy-fuel operation recently proposed by the present authors. A popularly used counterflow configuration is adopted as the research prototype in this work. The effects of (1) the preheated temperature of the oxidizer mixtures, (2) the oxygen concentration in the oxidizer flow and (3) the hydrogen concentration in the fuel mixtures on the reaction structure of biogas under the new combustion condition are investigated with the aid of the lattice Boltzmann method (LBM). Through numerical simulation, it is found that the MILD oxy-fuel combustion fueled by biogas can be sustained even with relatively low preheated temperature of the oxidizer, extremely highly diluted oxygen concentration in the oxidizer flow and little hydrogen addition in the fuel mixtures, which provide a solid theoretical basis to develop a novel scheme to respond to the challenge caused by CO2 emissions. Moreover, our discoveries imply the breakdown of the popularly used flamelet approach and emphasize the urgency to develop new turbulent combustion models for this novel combustion strategy. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.