气体先进再燃脱硝试验研究

选用天然气和液化石油气作再燃燃料，氨水和尿素作还原剂，碳酸钠和乙醇作添加剂，采用锅炉燃烧模拟装置研究了多种形式先进再燃的脱硝性能。结果表明：先进再燃比基本再燃脱硝效率明显提高。在典型条件：再燃比为15%，再燃温度为1 273 K，氨氮摩尔比为1.5时，天然气和液化石油气先进再燃脱硝效率分别达到82%~88%和82%~ 92%，而氨的有效利用率比SNCR中的低。碳酸钠能有效拓宽还原剂脱硝温度窗口，乙醇则对还原剂脱硝有一定的抑制作用。还原剂远离燃尽风喷入燃尽区下游适宜温度范围内，可获得更高的脱硝效率和还原剂利用率。先进再燃与SNCR复合脱硝效率可达90%以上，是一种高效的脱硝方法。

Experimental Study on Advanced Gas Reburning for NOx Reduction

The performances of diversiform advanced reburning (AR) for NO reduction were investigated by the boiler simulator facility, in which the natural gas (NG), the liquid petroleum gas (LPG) , ammonia, urea, sodium carbonate and ethanol were used as reburning fuels, N-agents and additives respectively. Results show that the de-NOx efficiency of AR was improved remarkably, comparing with the reburning. The efficiencies of AR with NG and LPG were respectively 82%~88% and 82%~92% under typical conditions with reburning fuel ratio of 15%, 1 273 K and molar ratio of N-agent to NO about 1.5. However the utilization efficiency of N-agents was lower in the AR than in the selective non-catalytic reduction (SNCR). Sodium carbonate can broaden the reactive temperature window effectively, but ethanol restrains the NO reduction by N-agents to a certain extent. The N-agent was injected into the downstream burnout zone with optimal temperature range far from overfire air injection, the higher de-NOx efficiency and availability of N-agent could be achieved. The de-NOx efficiency of hybrid AR/SNCR could get above 90%，which is a very effective method for NOx control.