CFD数值模拟在两级串塔脱硫系统中的应用

为准确获取两级串塔脱硫系统的气液两相反应特点，采用分步法和自主开发的托盘模型对某电厂双塔串联湿法脱硫塔喷淋段内部的气液两相流动和传热过程进行CFD数值模拟，采用全新的系统评价指标对脱硫系统进行评估，对脱硫系统进行优化设计并重新进行数值模拟评估。计算结果表明:无论预洗塔和吸收塔，通过合理增加托盘和增效环的设计，可以在减少1层喷淋层的基础上获得更佳的性能，有利于达到更高的脱硫标准；减少循环浆液量的同时能够降低脱硫塔整个系统压降，降低电耗。

APPLICATION OF CFD IN A DOUBLE STAGE DESULFURIZATION SYSTEM

In order to accurately obtain the gas-liquid two-phase reaction characteristics of the two-stage series tower desulfurization system, the gas-liquid two-phase flow and heat transfer process in the spray section of the double tower series wet desulfurization tower in a power plant were numerically simulated by using the step-by-step method and the self-developed tray model. A new system evaluation index was used to evaluate the desulfurization system, and the desulfurization system was optimized and evaluated by numerical simulation. The calculation results showed that no matter the pre washing tower or the absorption tower, the design of adding tray and efficiency ring reasonably could obtain better performance on the basis of opening less spray layer, which was conducive to reaching the higher standard of desulfurization, and reducing the amount of circulating slurry as well as reducing the pressure drop of the whole system of desulfurization tower and the power consumption.