高温富燃料区喷氨还原NO<sub><i>x</i></sub>的实验研究

高温富燃料区喷氨还原NO_x的实验研究

摘要: 利用一维管式电加热沉降炉实验装置，以尿素溶液为氨基还原剂（简称氨剂），探讨了NO_x的还原机理，分析不同过量空气系数A_SR、氨氮物质的量比B_NSR和温度T等反应条件下氨剂对NO_x还原效果的影响。结果表明：实验温度条件下，随着A_SR的减小，NO_x质量浓度降低；当A_SR≤0.95时，NO_x质量浓度随着B_NSR的增加而降低，当B_NSR>2时，NO_x质量浓度降低速度变缓；在低A_SR条件下，高温更有利于NO_x质量浓度的降低；当A_SR=1.2时，不同温度下NO_x质量浓度均随着B_NSR的增加而快速升高。

Abstract: Taking urea solution as the amino reducing agent, experimental tests were conducted in a one-dimensional tube furnace, so as to study the mechanism of NO_x reduction, and to analyze the effects of amino reducing agent on the NO_x reduction under different conditions of air stoichiometric ratio (A_SR), nitrogen stoichiometric ratio (B_NSR) and reaction temperature (T). Results show that at experimental temperatures, the NO_x concentration drops with reducing values of A_SR; in the case of A_SR ≤ 0.95, the NO_x concentration reduces with rising B_NSR, but the reducing degree tends to slow down when B_NSR>2; under lower A_SR conditions, high temperature is beneficial to the reduction of NO_x concentration; for A_SR=1.2, the NO_x concentration increases rapidly with the rise of B_NSR at different temperatures.