水洗对五彩湾煤燃烧产生NO_x影响的实验研究

Experimental Investigation for Effect of Water Washing on NO_x release during Wucaiwan coal combustion

通过对五彩湾煤水洗滤液中阴离子的成分分析出水溶性Na的具体赋存形式,并在此基础上研究了不同水洗时间下的煤在不同温度下燃烧产生NO_x的情况。水洗五彩湾18 h可以脱除煤中接近80%的Na,五彩湾煤中水溶性Na是以NaCl、NaHCO_3、Na_2SO_4的形式存在。400℃条件下,水洗后的煤比原煤产生的NO_x峰值浓度减少了约一半;600℃条件下,煤燃烧产生NO_x的峰值浓度随着水洗时间呈先减少后增加的趋势;1000℃条件下,从煤粉水洗12 h开始,产生的NO_x量呈递增趋势。在较低温度下燃烧时,水洗会使燃尽时间大幅增加,随着温度的增加,水洗对煤燃尽时间的影响逐渐变小。

Analyzing the occurrence of a specific form of water-soluble Na from Wucaiwan coal washing filtrate anion component, and on this basis, to study the situation of NO_x from coal combustion under different washing time and temperatures. Nearly 80 % of Na can be removed by washing Wucaiwan coal for 18 h. The water-soluble Na of wucaiwan coal exists as NaCl, NaHCO_3 and Na_2SO_4. At 400 ℃ condition, the peak concentration of No_x decreased by about half after washing. At 600 ℃ condition, the peak concentration of No_x produced by coal combustion was an increasing trend to reduce as the washing time increased. At 1000 ℃ conditions, the amount of No_x showed an increasing trend after the coal was washed for 12 h. When burning at a lower temperature, the burning time increased substantially when the coal was washed, and with increasing temperature, the impact becomes smaller.