热力发电2017，Vol.46Issue(11)：108-113,6.DOI:10.3969/j.issn.1002-3364.2017.11.108
超低排放燃煤机组细颗粒物排放特性实验
Experimental study on fine particle emission characteristics of ultra-low emission coal-fired units
摘要
Abstract
Fine particles can suspend in the air over a long period of time, which leads to fog and haze. As one of the main sources of fine particle emission, coal-fired units usually apply electrostatic precipitator (ESP) and wet flue gas desulfurization (WFGD) system to control particle emission. According to the coal and fly ash properties of a 600 MW coal-fired unit, the influence of flue gas conditioning (FGC) on the performance of ESP was experimentally studied, and the removal mechanism of fine particles was also analyzed. Moreover, the particle samples at inlet and outlet of the WFGD system were collected to measure the mass concentration of particles with different diameters. The results show that, the ash particle concentration at outlet of the ESP applying dual FGC was 18 mg/m3, which was 55 mg/m3 lower than that not using the FGC. The fly ash resistivity decreased to 1.23×1010Ω·cm after injecting 42.86 mg/m3 SO3 at the ESP inlet, which was in the effective operating range. After the flue gas passed through the WFGD system, the particle concentration dropped from 18 mg/m3 to 4.2 mg/m3 and the particle removal efficiency was 76.67%. However, the fine particle concentration increased by 0.84 mg/m3, which were mainly fine particles (generating during WFGD process, CaSO4·2H2O) with diameter smaller than 1 μm.关键词
燃煤机组/超低排放/细颗粒物/烟气调质/除尘器/烟气脱硫Key words
coal-fired unit/ultra-low emission/fine particle/flue gas conditioning/precipitator/desulfurization分类
能源科技引用本文复制引用
陈鸿伟,梁占伟,赵斌,高明非,张梅有,赵争辉..超低排放燃煤机组细颗粒物排放特性实验[J].热力发电,2017,46(11):108-113,6.基金项目
河北省自然科学基金项目(E2016502058).Natural Science Foundation of Hebei Province (E2016502058) （E2016502058）
