超细颗粒物聚并模型的比较研究

摘要

The major forms of coalescence in the turbulence coalescence device are thermal coalescence. Coulomb coalescence, Brown coalescence and turbulence coalescence. Different coalescence forms were simulated by coupling turbulent two-fluid model and population balance model. The result shows that turbulence coalescence is the most important form, and Brown coalescence and thermal coalescence have little effect on the whole coalescence, so they can be eliminated; Coulomb coalescence has an obvious enhancement effect on the turbulence coalescence, therefore, particles should be pre-charged before the aggregation device to improve the effect of particle coalescence, the effect of thermal coalescence is obvious in practical power station smoke temperature conditions, so it should be considered in power station.%聚并器内超细颗粒物的聚并形式主要有热聚并、库仑聚并、布朗聚并和湍流聚并.采用湍流双流体模型和颗粒群平衡模型(PBM)进行耦合,对不同机理的聚并机理进行模拟计算,结果表明,聚并器内湍流聚并起最主要作用,布朗聚并和热聚并对湍流聚并增强较小,可以忽略；库仑聚并对于湍流聚并提高明显,因此,可以考虑在聚并器前对颗粒预荷电,提高颗粒聚并效果；在电站实际烟温条件下,热聚并效果是明显的,因此在电站实际运行中热聚并作用也需考虑在内.