脱硫废水零排放系统关键参数数值模拟研究

Numerical Simulation of Key Parameters of Zero Discharge System for WFGD Wastewater

利用数值模拟技术对脱硫废水在电除尘器前烟道中的蒸发技术进行了研究,分析了液滴粒径、烟气温度、烟气流速、废水量、喷射速度、喷射角度等参数对液滴停留时间的影响规律。结果表明,烟气温度越高,液滴粒径越小,喷射量越小,液滴的停留时间就越短;随着烟气流速、喷射速度、喷射角度增大,停留时间呈现不同的变化趋势。研究结果可对工程选型、设计优化提供支撑。

The evaporation technology of WFGD wastewater in the flue gas before it enters ESP is studied by numerical simulation.The impacts of the six parameters on droplet residence time and evaporation distance are investigated, i.e., droplet size, flue gas temperature, flue gas velocity, wastewater volume, jet velocity and jet angle of wastewater. The results show that the higher of the flue gas temperature, the smaller of the droplet size and the injection amount, the less residence time of the droplet will last. With the increase of flue gas velocity, injection velocity and injection angle, the residence time tends to decrease first and then rise afterwards.The research results can provide support for project decision-making process and design optimization.