水煤浆再燃降低锅炉NOx排放的实验研究

为明确锅炉采用水煤浆再燃技术时的整体NOx控制效果和影响因素，利用神华煤，在0.25 MW沉降炉上，分别以煤粉和水煤浆为再燃燃料，进行了再燃NOx控制实验。结果显示，水煤浆再燃时的脱硝效果优于煤粉；一定范围内，较高的再燃比有利于锅炉整体再燃脱硝；锅炉主燃区宜采用氧化性氛围，此时该处的过量空气系数与脱硝效果呈现二次曲线关系；水煤浆再燃脱硝率与再燃区过量空气系数成反比。实验证实，水煤浆是一种较优的再燃燃料，可被广泛应用，以实现对工业炉NOx排放的有效控制。

Experimental Study on Reducing Furnace NOx Emission Through Coal Water Slurry Reburning

The performance of coal water slurry (CWS) reburning technology for NOx emission control was investigated in a 0.25 MW down-fired furnace. Shenhua pulverized coal and its CWS were reburning fuels. The results indicate that CWS is superior to pulverized coal in regard to NOx reduction; high reburning fuel fraction and oxygen primary combustion zone favor to the control of furnace NOx emission; NOx reduction efficiency is inverse proportional to the square of excess air ratio in the primary combustion zone, and decreases with increase in the reburning zone excess air ratio. CWS is a good reburning fuel and could be widely applied in the industry furnace for further NOx emission control.