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A GLOBAL NO_x SUBMODEL FOR PULVERIZED COAL FLAMES AT ELEVATED PRESSURES

机译:高压下粉煤火焰的全局NO_x子模型

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This study formulates a global NOx submodel for deployment in CFD simulations from a database on flames of three diverse coals at pressures to 3.0 MPa for broad ranges of stoichiometric ratio (S.R.). A new reaction scheme was formulated from a sensitivity analysis of simulations based on detailed reaction mechanisms for all tests. It shares many elements in common with commercial submodels, yet it correctly predicts that (1) less coal-N is converted into NO; and (2) HCN persists to higher S.R. for progressively higher pressures. Explicit dependences on O_2 concentrations are responsible for the first feature, because the variations in O_2 concentrations mimic the ways that the oxyhydroxyl radical pool shrinks at progressively higher pressures, which shifts HCN conversion toward N_2 production. The second feature was depicted by resolving the intermediate products of HCN decomposition in the global scheme. Discrepancies surfaced when the new submodel was applied to different coals without re-adjusting rate parameters, which probably reflects a generic limitation of global NO_x production submodels for coal combustion.
机译:这项研究从一个广泛的化学计量比范围(S.R.)的压力至3.0 MPa的压力下的三种不同煤的火焰数据库中,制定了一个用于CFD模拟的全局NOx子模型。根据对所有测试的详细反应机理,通过对模拟的敏感性分析,制定了新的反应方案。它具有与商业子模型相同的许多元素,但它正确地预测出:(1)较少的煤N转化为NO。 (2)HCN持续较高的S.R.逐渐增加压力。显着依赖于O_2浓度是第一个特征,因为O_2浓度的变化模拟了羟基羟基自由基池在逐渐升高的压力下收缩的方式,这使HCN转化向N_2产生转移。通过解决全局方案中HCN分解的中间产物来描述第二个特征。当将新的子模型应用于不同的煤而不重新调整速率参数时,差异就浮出水面,这可能反映了全球煤炭燃烧NO_x生产子模型的一般限制。

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