非均匀降膜式气液交叉流除尘系统运行能耗数值分析

气液交叉流(GLCA)除尘系统通过分布板形成阵列液柱群捕获尾气中的颗粒物，其运行能耗主要集中于循环水耗。为降低循环液量，以迎风面布膜的非均匀降膜阵列代替原液柱。采用大涡模拟(LES)和离散相模型(DPM)对GLCA系统除尘过程进行数值模拟，所得模拟结果与实验吻合。结合某氨酸法复合肥生产线尾气数据，以比电耗为评价标准，利用所得模型对降膜槽的迎风面布膜角度进行寻优。结果表明，研究条件下非均匀降膜式GLCA系统达到最低运行能耗对应的最佳布膜角度为70°，单位体积尾气的质量除尘效率达到80%时对应的比电耗可低至1.83×10-4 kW·h·m-3，与燃煤电厂电除尘器1级能效相当。

Numerical Analysis of Operating Energy Consumption in Non-uniform Falling Film Gas-Liquid Cross-flow Array System

The operation energy consumption is mainly composed of water recycle of the gas-liquid cross-flow array (GLCA) system, which captures particles from the exhausted gas by forming arrays of liquid columns through the distribution plates. To reduce the energy consumption of GLCA system, non-uniform falling film at the windward side was utilized to supersede previous liquid columns technology. Large eddy simulation (LES) and discrete phase model (DPM) were employed in the numerical simulation for GLCA system, which proves a good agreement between simulation result and experimental data. Using the evaluation criteria of specific power consumption as a baseline, the windward film angle of falling film channel was optimized with the numerical simulation model based on the exhausted gas data of a certain compound fertilizer production by ammonia-acid process. The results showed that the optimal angle with the lowest operation energy consumption of the non-uniform falling film GLCA system is 70°. The corresponding specific power consumption can be as low as 1.83×10-4 kW·h·m-3 when the quality dust removal efficiency exhaust gas per unit volume reaches 80%. The specific power consumption can be equivalent to Grade 1 comparing to the energy efficiency grades of the electrostatic precipitator in coal-fired power plants.