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Investigation of Thermal and Environmental Characteristics of Combustion of Gaseous Fuels

机译：气体燃料燃烧的热环境特征研究

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摘要

Numerical investigations are fulfilled for some thermal and environmental characteristics of combustion of gaseous fuels used at present in tube furnaces of petroleum refineries. The effect of the fuel composition on these characteristics is shown and probable consequences of the substitution of natural gas to other types of fuels. Methane, ethane, propane, butane, propylene, and hydrogen are considered for comparison, which in most cases are constituents of the composition of the fuel burnt in furnaces. The effect of the fuel type, its associated combustion temperature, combustion product emissivity, temperature of combustion chamber walls, mean beam length, and heat release on the variation in the radiant heat flux within the radiant chamber of furnaces is investigated. The effect of flame characteristics, which are determined by the presence of diffusion combustion zones formed by burners used at present in furnaces for reducing nitrogen oxides emission, is analyzed. The effect of the fuel type on the equilibrium NO concentration is also investigated. The investigations were carried out both at arbitrary given gas temperatures and at effective temperatures dependent on the adiabatic combustion temperature and the temperature at the chamber output and determined based on solving a set of equations at various heat-release rates of the combustion chamber.
机译：对目前在石油精炼厂的管式炉中使用的气态燃料燃烧的一些热和环境特性进行了数值研究。显示了燃料成分对这些特性的影响，以及天然气替代其他类型燃料的可能后果。考虑将甲烷，乙烷，丙烷，丁烷，丙烯和氢气进行比较，它们在大多数情况下是在炉中燃烧的燃料成分的组成部分。研究了燃料类型，其相关的燃烧温度，燃烧产物的发射率，燃烧室壁的温度，平均束长和热量释放对炉子辐射室内辐射热通量变化的影响。分析了火焰特性的影响，火焰特性的影响是由目前燃烧炉中用于减少氮氧化物排放的燃烧器形成的扩散燃烧区的存在所决定的。还研究了燃料类型对平衡NO浓度的影响。研究是在任意给定的气体温度和有效温度下进行的，这些温度取决于绝热燃烧温度和燃烧室输出温度，并基于在燃烧室各种放热率下求解一组方程式来确定。

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