低低温电除尘技术特点及在高灰煤超低排放工程中的应用

低低温电除尘器在燃煤机组节能提效的同时,对SO₃也具有很高的脱除率。当灰硫比大于100时,低低温电除尘器不会发生低温腐蚀。从低低温电除尘器主要工艺参数选择、需关注问题及应对措施、污染物减排特性等方面进行了阐述和分析。重点介绍了典型工程案例淮北平山电厂660 MW机组,经测试,低低温电除尘器除尘效率为99.97%,出口烟尘浓度为4.47 mg/m³,PM_2.5浓度为2.4 mg/m³,湿法脱硫后烟尘浓度为2.3 mg/m³。表明低低温电除尘技术配合旋转电极式电除尘等技术组合,不但可以实现电除尘器出口5 mg/m³的烟尘浓度,而且还可实现高灰煤烟尘超低排放。

Characteristics of Low-Low Temperature ESP Technology and Its Application in Ultra-Low Emissions for High-Ash Coal-Fueled Power Plant

The low-low temperature ESP achieves the goal of efficiency-enhancing and energy-saving with high SO₃ removal efficiency as well. Low-temperature corrosion will not occur given the ratio of ash to sulfur more than 100. In this paper, the authors elaborated and analyzed the topics on technical parameter settings, major problems and corresponding countermeasures, pollutant emission reduction characteristics of low-low temperature ESP, etc. A typical case of 660-MW unit of Huaibei Pingshan Power Plant is presented. The test shows that the dust removal efficiency of the ESP is 99.97%, the outlet dust and PM_2.5 concentrations of the ESP are respectively 4.47 mg/m³ and 2.4 mg/m³ while the outlet dust concentrations of WFGD are 2.3 mg/m³, which proves that the combination of low-low temperature ESP with rotating electrode type ESP can not only reduce the outlet dust concentration of the ESP to 5 mg/m³, but also realize ultra-low emission for high-ash and low quality coal.