Effect of attapulgite on PM2.5 emission and agglomeration during coal combustion
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摘要: 在固定床反应系统上考察凹凸棒黏土对燃煤可吸入颗粒物PM2.5的排放及团聚捕集特性影响,分析凹凸棒黏土添加量以及添加凹凸棒黏土情况下燃烧气氛、燃烧温度和钙硫物质的量比等参数对燃煤PM2.5的数量浓度、质量浓度以及团聚捕集率的影响规律。结果表明,煤燃烧过程中添加凹凸棒黏土可以显著降低PM2.5排放浓度,凹凸棒黏土的添加量不宜超过3%(质量分数);空气气氛下燃烧产生的PM2.5多于O2/CO2气氛;随着钙硫物质的量比的增大,PM1的质量浓度减小,但PM1~2.5的质量浓度增大,颗粒物的粒径有向更大粒径转移的趋势;燃烧温度的升高会促进PM2.5各粒径范围颗粒物的生成,降低了凹凸棒黏土对PM2.5团聚捕集率。Abstract: Effect of attapulgite on PM2.5 emissions and agglomeration during coal combustion was investigated in a fixed bed system. The effects of addition amount, combustion temperature, mole ratio of calcium to sulfate and combustion atmosphere on mass and number concentration and collection efficiency of PM2.5 were analyzed. The results show that attapulgite added during coal combustion can effectively reduce PM2.5 emissions. The suitable amount of attapulgite is no more than 3%. PM2.5 emission during coal combustion in air is higher than that in O2/CO2 atmosphere. PM1 mass concentration decreases with increasing mole ratio of calcium to sulfate, while PM1~2.5 mass concentration increases, indicating an increasing trend in particle size. Increasing combustion temperature will increase PM2.5 emission and reduce its collection.
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Key words:
- attapulgite /
- PM2.5 /
- particle agglomeration
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