燃煤电厂电除尘PM_(10)和PM_(2.5)的排放控制Ⅲ:电除尘电源及小分区改造与PM_(10)和PM_(2.5)的排放(以44×330MW机组为例)

PM_(10) and PM_(2.5) Emission Control by Electrostatic Precipitator(ESP) for Coal-fired Power Plants Ⅲ: Applications with A 4×330 MW Power Plant

讨论了4台典型电除尘改造和细颗粒物（PM2.5）排放控制,对四电场电除尘器通过本体小分区和电源改造实现了颗粒物（PM10）和细颗粒物（PM2.5）的超低排放控制。仅对五电场电除尘器进行电源改造,即可实现PM10和PM2.5的超低排放,电除尘出口PM10和PM2.5可分别控制在15和2 mg/m^3以下。脱硫塔对PM10有较好的捕集效果,但对PM2.5的去除几乎没有效果。电除尘振打引起的二次飞扬过程及烟气温度也影响PM10和PM2.5的排放,当烟气温度从150～160℃降低到约110℃时,电除尘出口及脱硫塔出口的PM2.5均在2 mg/m^3以下。

This paper discusses how to upgrade electrostatic precipitators（ESPs） with four 330 MW coal-fired generators. For the two four-field ESPs, the upgrading includes replacement of high-voltage electrodes and the high-voltage power sources. For the two five- field ESPs, only the power sources are retrofitted. The ESP outlet PM10 and PM2.5 emissions are less than 15 and 2 mg/m^3,respectively. The flue gas desulfurization（FGD） can be effective for PM10 emission reduction, but not for PM2.5. This paper also presents the rapping and gas temperature effects on particle emission. When reducing the gas temperature from 150-160℃ to about110℃, PM2.5emission from the ESP or FGD is always less than 2 mg/m^3.