高压环境下高炉煤气化学反应机理敏感性分析及机理简化
Chemical Reaction Mechanism Sensitivity Analysis and Simplification of Blast Furnace Gas in Elevated Pressure Environment

为了解决数值研究过程中缺乏适用于高压条件下高炉煤气简化机理的问题,利用敏感性分析方法、借助一维层流预混反应器模型,分析了各基元反应对燃烧速率的影响程度。通过选取敏感性较大的反应并修正其在高压条件下的反应动力学参数,将详细反应机理简化为一套适用于常压至3 MPa燃烧环境下的18步简化机理。采用简化机理、GRI3？？0机理和Davis机理分别对层流火焰速度、点火延迟和组分摩尔浓度等参数进行了计算并与实验数据进行了对比。结果表明,在常压及高压条件下18步简化机理获得的计算结果与实验结果吻合较好,其为高压条件下高炉煤气等低热值气体燃烧特性的数值研究奠定了基础。
To solve the lack of reduced BFG (blast furnace gas) mechanism under elevated pressure in numerical simulation, the sensitivity of every elementary reaction to combustion rate is analyzed by the one dimensional laminar premixed reactor model. The steps with higher sensitivities are selected and the chemical kinetic parameters are revised. The detailed mechanism is then simplified to an 18？？step skeletal mechanism which is specified to a 0？？1-3 MPa combustion environment. The reduced 18？？step mechanism is validated by computations of laminar flame speeds, ignition delay times and species concentration, and by comparisons with available experimental data and computational results from GRI3.0 mechanism and Davis mechanism. The result calculated by 18？？step mechanism well coincides with the experimental data. The reduced mechanism is especially beneficial to combustion research of low calorific value fuels (like BFG) under high pressure