除雾器ΔP-v-d_(cr)选型方法研究

A Study of the Type Selection of Mist Eliminators with the Help of a ΔP-v-d_(cr) Method

通过对湿法脱硫系统中除雾器分离特性的研究 ,定义了除雾器临界分离粒径和圆柱对液滴临界捕捉粒径两个概念。针对设有管式烟气再加热器湿法脱硫系统 ,提出了除雾器ΔP v dcr选型方法。该方法为 :在满足烟气压降小于2 0 0Pa且临界分离粒径小于烟气再加热器管壁临界捕捉粒径要求的除雾器中 ,选择烟气压降最小的除雾器作为最佳选型。该方法简洁明了 ,对除雾器的优化设计、选型和运行工况分析有一定的指导作用 。

Through a study of the separation characteristics of a mist eliminator in a wet desulfurization system the following two concepts are defined, namely, critical separated droplet diameter of a mist eliminator and critical captured droplet diameter by a cylinder. With respect to a wet desulfuriztion system equipped with a tubular flue-gas reheater the authors have proposed the type selection of mist eliminators by using a ΔP-v-d_ cr method. This method can be described as follows. A mist eliminator with the lowest flue-gas pressure drop is selected as the optimum type. The selection shall meet two requirements: i.e. the flue-gas pressure drop is less than 200 Pa and the critical separated particle diameter is smaller than the critical captured particle diameter of the flue-gas reheater tube wall. The recommended method features conciseness and clarity. It can serve as a guide during the optimized design, type selection and operating condition analysis of mist eliminators. Moreover, it also provides a standard for a comprehensive evaluation of the separation characteristics of mist eliminators.