杨振民 黄超 王嘉豪 耿婉婷

摘要 湿式静电除尘器依靠水膜冲刷进行清灰，实际工作中气流温度对水膜蒸发速率、伏安特性及除尘效率具有一定影响。本文将碳纤维布、PVC刻槽板分别作为湿式静电除尘器的收尘极，用电加热器对进口气流进行加热，研究了除尘器进出口气流含湿量、伏安特性及除尘效率随加热温度的变化规律。结果发现：随着加热温度的提高，相同供水量下的进口气流含湿量逐渐增大;相同供水量及相同加热温度条件下，碳纤维收尘极单位空气水膜蒸发量和水蒸气利用量均大于PVC板。在相同电压下，随着加热温度的提高，电流逐渐增大。相同供水量和加热温度条件下，碳纤维收尘极的电流大于PVC板。在相同供水量下，随着加热温度的提高，除尘效率亦逐渐增大。相同供水量和加热温度条件下碳纤维收尘极的除尘效率高于PVC板。

关 键 词 气流温度;膜电极;水膜蒸发;伏安特性;除尘效率

中图分类号 X701.2     文献标志码 A

Abstract It is by water film scouring that WESPs （wet electrostatic precipitators） clean the dust on the collectors. The temperature of airflow has great influences on the water film evaporation rate， V-I characteristic and dust collection efficiency. Making carbon fiber fabric and grooved PVC plate as collectors in WESP， heating the inlet airflow to different temperatures， we studied the changing regulations of moisture content of inlet and outlet airflow in WESP， V-I characteristics and dust collection efficiencies with the heating temperatures in this paper. It is found that with the increase of heating temperature， the moisture content of inlet airflow under the same water flow rate increases gradually. When the water flow rate and heating temperature are determined， the moisture content of inlet airflow on the carbon fiber fabric is bigger than the grooved PVC plate. Under a determined voltage， with the boost of heating temperature， the electric current becomes larger. With the same water flow rate and heating temperature， the current in the WESP with carbon fiber fabric is larger than that with grooved PVC plate. With the same water flow rate， the dust collection efficiency increases with the enhancement of heating temperature. With the same water flow rate and heating temperature， the collection efficiency of the carbon fiber fabric is larger than the grooved PVC plate.

Key words temperature of flue gas; membrane collection electrode; evaporation of water film; V-I characteristics; dust collection efficiency

0 引言

干式静电除尘器（ESP）一般采用机械振打等方式清灰，而湿式静电除尘器（WESP）则采用水膜冲洗方式。相比干式静电除尘器，湿式静电除尘器具有除尘效率高、无二次扬尘等优点，故湿式静电除尘器的应用越来越普遍。

工作参数对静电除尘器的工作性能具有重要影响，如烟气温湿度、工作电压、给粉量等均会影响除尘效率。尤其是烟气温度不仅影响粉尘比电阻[1-2]及荷电[3]，还会影响电场强度[4]。已有学者对干式静电除尘器中烟气温度的影响进行了相关研究。……