摘要
湿式电除尘器电场的放电状态变化大、干扰因素多,尤其是导电玻璃钢阳极管内壁材料的特殊性,必须尽量减少火花放电,防止电极灼伤甚至起火,保证设备安全、稳定运行。为了深入研究湿式电除尘器的电源供电特性及污染物脱除性能,搭建了湿式电除尘器实验系统,并开展不同类型电源的对比实验。实验结果表明:湿式电除尘器喷淋系统开启,工频恒流源运行相对平稳,出口烟尘浓度变化不大,但恒压源则存在一个电源参数振荡区,出口烟尘浓度增加了约147%,因此,湿式电除尘器应优先考虑抗干扰能力强的恒流源;高频恒流源的运行参数更高,污染物脱除性能更强,与工频相比,高频恒流源不同供电电耗时烟尘、SO3的减排幅度分别为46.30%~78.69%、42.86%~66.67%。通过对实际工程项目的深度测试及节能优化实验,定量分析了湿式电除尘器的比电耗与污染物脱除性能关系。工程实践表明:随机组负荷的降低,湿式电除尘器的污染物脱除性能有所提升,但高压供电比电耗也大幅增加,从满负荷到50%负荷,比电耗从2.41×10^-4 kWh·m^-3升至4.57×10^-4 kWh·m^-3,有较大的节能空间;经节能优化,控制湿式电除尘器出口烟尘浓度在4~5 mg·m^-3,50%负荷的比电耗下降达84.68%。根据该节能优化思路,对其他3个工程项目实施运行优化,控制烟尘排放浓度在4.5 mg·m^-3以内,比电耗下降幅度分别为32.65%、27.15%、41.64%。以上研究结果可为后续湿式电除尘器的性能提升及节能优化提供参考。
The discharge state of the electric field in wet electrostatic precipitator presents large changes and has many interfering factors.Particularly due to the special materials of the inner wall of conductive FRP anode tube,it was necessary to reduce the spark discharge as much as possible and prevent the electrode burn or even catching fire,then ensure the safe and stable operation of the equipment.In order to further study the power supply characteristics of high voltage constant current source and pollutant removal performance of wet electrostatic precipitator,an experimental system of wet electrostatic precipitator was established,and the comparative experiments of different types of power supply were conducted.The results showed that when the spray system of wet electrostatic precipitator was turned on,fundamental frequency constant current source run relatively smoothly,and the smoke concentration at outlet presented slight change.However,there was an oscillation zone for supply parameters for constant voltage source,and the smoke concentration at outlet increased by about 147%.Therefore,wet electrostatic precipitator preferred to use constant current source with strong anti-interference ability.For the high frequency constant current source,it had higher operation parameters and stronger pollutant removal performance.Compared with the fundamental frequency,the emission reduction ranges of dust and SO3 at different power supply consumptions of high frequency constant current source were 46.30%~78.69% and 42.86%~66.67%,respectively.Moreover,the relationship between specific power consumption and pollutant removal performance of the wet electrostatic precipitator was quantitatively analyzed through in-depth testing of practical engineering projects and energy-saving optimization experiments.Engineering measurement showed that the pollutant removal performance of the wet electrostatic precipitator was improved with the reduction of unit load,but the specific power consumption of high voltage power supply increase
作者
杨丽萍
YANG Liping(College of Traffic Mechanical and Electrical,Yunnan Technology and Business University,Kunming 651700,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第3期730-742,共13页
Chinese Journal of Environmental Engineering
基金
云南省应用基础研究计划重点项目(2014FA029)。
关键词
燃煤电厂
湿式电除尘器
高压恒流源
污染物脱除性能
电耗
比电耗
coal-fired power plant
wet electrostatic precipitator
high voltage constant current power supply
pollutant removal properties
power consumption
specific power consumption
