烟气参数对细颗粒湍流聚并的影响
Influences of turbulent agglomeration of fine particles under flue gas parameters
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摘要: 细颗粒湍流聚并技术是控制燃煤烟气中细颗粒排放的有效措施之一。为了研究烟气参数对湍流聚并效果的影响，在一种细颗粒湍流聚并器中分别对烟气流速、烟气温度、颗粒物浓度以及烟气含湿量进行实验测试。结果表明：烟气流速能显著增大聚并器内湍流强度，提高飞灰颗粒的聚并效率，烟气流速为16 m·s-1时，PM2.5聚并效率为44.51%；烟气温度在酸露点以上时，其对飞灰颗粒聚并效率的促进作用有限；颗粒物浓度越大，则烟道内单位体积的颗粒物数量越多，从而增加了颗粒间的碰撞概率，飞灰颗粒聚并效率明显提高，颗粒物浓度为35 mg·L-1时，PM2.5的聚并效率达到52.48%；烟气含湿量较低时对飞灰颗粒聚并过程影响不大。Abstract: The turbulent agglomeration of fine particles is an effective method in the control of emissions of fine particles from coal-fired flue gas. The agglomeration of fine particles was studied with different flue gas parameters, including velocity, temperature, particle concentration and moisture content of the flue gas. The results show that turbulent intensity is significantly improved by increasing flue gas velocity, promoting the agglomeration rate of fly ash particles. When the flue gas velocity was 16 m·s-1, the agglomeration rate of PM2.5 was 44.51%. The flue gas temperature has a limited effect on the agglomeration rate of fine particles above the acid dew point. The higher concentration of particles, the greater number of particles per unit volume in flue. This increases the probability of collisions between particles, and improves the agglomeration rate of fly ash. With a particle concentration of 35 mg·L-1, the agglomeration rate of PM2.5 increased to 52.48%. The lower moisture content of flue gas has little effect on the agglomeration process of fly ash particles.
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