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为探明脱硫-除尘一体化系统内反应密集区以及因袋式除尘器远端利用率不高而导致除尘效率低下的原因,急需对一体化系统内流场分布进行研究。应用Fluent软件对密相干塔脱硫-除尘一体化系统进行仿真模拟,标准κ-ε湍流模型模拟气相流动,离散相(DPM)模型模拟固相流动,对改进前后的一体化系统进行模拟。模拟结果表明:除尘器内部增加气流板及改变风口布置方式对烟气在除尘器内的均匀流动都起到了良好的作用,其中改变风口布置方式效果更显著。密相干塔内部导流板最优设计长度为7.5 m,角度为45°。
In order to find out the reasons of the low efficiency of dust removal in the reaction-intensive area of desulfurization-dedusting system and the low utilization efficiency of the bag filter, it is urgent to study the distribution of flow field in the integrated system. The Fluent software was used to simulate the system of desulfurization and dust removal in the incinerator tower. The standard κ-ε turbulence model was used to simulate the solid-phase flow by simulating the gas-phase flow and the discrete phase (DPM) model to simulate the integrated system before and after the improvement. The simulation results show that increasing the air flow inside the precipitator and changing the arrangement of the tuyeres have a good effect on the uniform flow of flue gas in the precipitator. The effect of changing the tuyere arrangement is more significant. The optimum design length of the inner deflector of the incinerator tower is 7.5 m and the angle is 45 °.