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为了揭示再燃过程中地下气化煤气作为多组分还原性气体(H2、CO等)降低还原NO的影响规律,在气体反应器实验台上进行了多组分还原性气体脱硝的实验研究。实验结果表明:反应温度不变时,化学当量比增大,NO脱除率逐渐降低;化学当量比较低时,随着反应温度的升高,NO脱除率逐渐升高;化学当量比较高时,再燃区存在一个最佳反应温度条件;停留时间对多组分气体再燃脱硝的影响规律表明,为提高再燃过程的脱硝效率,在锅炉设计时应尽量增加再燃燃料在再燃区的停留时间;再燃燃料比的增加使再燃区还原性气体浓度增加,这必然提高NO与还原性气体的反应速率,有利于进一步提高NO脱除。实验结果有利于了解多组分还原性气体再燃降低还原NO特性,组织良好的燃烧条件,可为理论研究提供参考依据。
In order to reveal the influence law of subterranean gasification as a multiple component reductive gas (H2, CO, etc.) during the reburning process, an experimental study of multi-component reductive gas denitration was carried out on a gas reactor bench. The experimental results show that when the reaction temperature is constant, the stoichiometric ratio increases and the NO removal rate decreases gradually. When the stoichiometric ratio is low, the NO removal rate increases with the increase of the reaction temperature. When the stoichiometric ratio is high , And there is an optimal reaction temperature condition in the reburn zone. The influence law of residence time on the reburning denitration of multicomponent gas shows that in order to improve the denitration efficiency of the reburning process, the residence time of the reburning fuel in the reburn zone should be increased as much as possible in the design of the boiler; The increase of the fuel ratio increases the concentration of the reducing gas in the reburning zone, which inevitably increases the reaction rate between NO and the reducing gas and is favorable for further improving the NO removal. The experimental results are helpful to understand the characteristics of the multi-component reducing gas reburning to reduce NO reduction and good tissue burning conditions, which can provide reference for theoretical research.