湿式电除尘器性能测试方法研究

METHOD FOR TESTING PERFORMANCE OF WET ELECTROSTATIC PRECIPITATORS

湿式电除尘器是燃煤电厂烟尘超低排放的主流除尘技术之一。针对湿式电除尘器的测试特点,提出了测试工况、测孔位置、测孔尺寸及采样点布置等相关要求,并分别对颗粒物、PM_(2.5)、SO_3等开展测试研究,给出了科学的测试方法:针对颗粒物,基于烟道内、烟道外两种采样方法,过滤装置内可配置滤膜或滤筒,应开展空白试验,当浓度较低时应采用一体化采样头;针对PM_(2.5),建议采用重量法(撞击器法)作为基准方法;针对SO_3,可采用冷凝法进行采样,当浓度较低时,建议采用冷凝法与吸收法相结合的手段。并基于此开展了现场实测,为国标《湿式电除尘器性能测试方法》的研制提供了技术及数据支撑,满足了燃煤电厂烟气超低排放测试的迫切需求。

Wet electrostatic precipitator(WESP) is one of the main dedusting techniques for ultra-low emission of smoke and dust in coal-fired power plants. According to its test characteristics, relevant requirements for the testing condition, hole-gaging position, hole size and sampling location, etc. were put forward. Test study on particles, PM2.5, SO3, etc. was carried out, and scientific testing methods were listed. In terms of particulate matter, based on the sampling methods of both inside and outside the flue, filter membrane or filter cartridge could be configured in the filter unit, and blank test should be carried out, and when the concentration was low, integrated sampling head should be adopted;in terms of PM2.5, it was recommended to use gravimetric method(impactor method) as the benchmark method;in terms of SO3, condensation method could be used for sampling, and when the concentration was low, it was recommended to combine condensation method with absorption method. And based on that, a field measurement was carried out, which provided technical and data support for the national standard 'Wet electrostatic precipitator-Methods of performance tests research', and met the pressing needs of the coal-fired power plants for ultra-low smoke and dust emission test.