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Investigation of Combustion Characteristics of Methane-Hydrogen Fuels

机译：甲烷-氢燃料的燃烧特性研究

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摘要

Numerical investigations of combustion characteristics of methane-hydrogen fuel used at present in tube furnaces of some petroleum refineries are carried out and possible problems related to change-over of existing furnaces from natural gas to methane-hydrogen fuel are analyzed. The effect of the composition of the blended fuel, associated temperature and emissivity of combustion products, temperature of combustion chamber walls, mean beam length, and heat release on variation in the radiation heat flux is investigated. The methane concentration varied from 0 to 100%. The investigations were carried out both at arbitrary given gas temperatures and at effective temperatures determined based on solving a set of equations at various heat-release rates of the combustion chamber and depended on the adiabatic combustion temperature and the temperature at the chamber output. The approximation dependence for estimation of the radiation heat exchange rate in the radiant chamber of the furnace at change-over to fuel with a greater hydrogen content is obtained. Hottel data were applied in the present work in connection with the impossibility to use approximated formulas recommended by the normative method for heat calculation of boilers to determine the gas emissivity, which are limited by the relationship of partial pressures of water steam and carbon dioxide in combustion products (p_(H_2O)/p_(CO_2) = 0.2-2.0). The effect of the methane-hydrogen fuel on the equilibrium concentration of nitrogen oxides is also investigated.
机译：对一些炼油厂的管式炉目前使用的甲烷-氢燃料的燃烧特性进行了数值研究，并分析了与现有炉从天然气转换为甲烷-氢燃料有关的可能问题。研究了混合燃料的成分，相关的燃烧产物的温度和发射率，燃烧室壁的温度，平均束长和放热对辐射热通量变化的影响。甲烷浓度从0到100％不等。研究是在任意给定的气体温度和有效温度下进行的，有效温度是根据在燃烧室的各种放热率下求解一组方程式而确定的，并且取决于绝热燃烧温度和燃烧室输出端的温度。获得用于估计在转换为具有更大氢含量的燃料时炉子的辐射室中的辐射热交换率的近似依赖性。在目前的工作中，由于无法使用标准方法推荐的近似公式来计算锅炉的热量，因此将Hottel数据用于确定锅炉的气体发射率，而该公式受燃烧中水蒸汽和二氧化碳分压的关系的限制。乘积（p_（H_2O）/ p_（CO_2）= 0.2-2.0）。还研究了甲烷-氢燃料对氮氧化物平衡浓度的影响。

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