Gasification-combustion technology can reduce NO while the formation characteristics of fine mode PM is unclear. This research studied the impact of the excess air coefficient (α) of the gasifier and the properties of coal on the formation and evolution of fine mode PM. The experiment was conducted on a self-sustaining furnace consisting of a gasifier where pyrolysis/gasification occurs and a combustion chamber where burnout of gasification gas and char occurs. The results showed that fine mode PM and NO can be synergistically reduced by optimizing α during gasification-combustion. A low or high α can lead to a high furnace temperature in the gasifier or combustion chamber, respectively. Elimination of high temperature is crucial to reduce element vaporization which promotes the formation of fine mode PM. Additionally, an optimized combination of furnace temperature and reducing atmosphere in the gasifier can decrease NO. The optimal α was 0.32 for bituminous coal (BC). Fine mode PM generated from gasification-combustion of BC, lean coal (LC), and semi-char (SC) mainly consists of Ca, Si, Fe, and S. The vaporization of element from LC and BC primarily occurs during char combustion in the combustion chamber, while the vaporization of element from SC occurs almost equally in the gasifier and combustion chamber.

中文翻译：

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自持炉煤低NOx气化燃烧过程中一次空气和煤的性质对细模颗粒形成的影响


气化燃烧技术可以减少NO，但精细模式PM的形成特征尚不清楚。本研究研究了气化炉的过量空气系数（α）和煤的性质对细模PM的形成和演化的影响。该实验在自持炉上进行，该炉由发生热解/气化的气化炉和发生气化气体和焦炭的燃烧室组成。结果表明，通过优化气化燃烧过程中的α，可以协同降低精细模式PM和NO。低或高 α 可分别导致气化器或燃烧室中的高炉温。消除高温对于减少元素蒸发至关重要，从而促进精细模式PM的形成。此外，炉温和气化炉中还原气氛的优化组合可以减少 NO。对于烟煤 (BC)，最佳 α 为 0.32。 BC、贫煤（LC）和半焦（SC）气化燃烧产生的精细模式PM主要由Ca、Si、Fe和S组成。LC和BC中元素的蒸发主要发生在焦炭燃烧过程中。燃烧室中，而 SC 中元素的汽化几乎同等地发生在气化器和燃烧室中。