可凝结颗粒物(CPM)在燃煤机组烟气排放的总颗粒物中有较大占比.为分析燃煤电站环保设备对CPM的脱除效果,对某超低排放燃煤机组现有低低温电除尘、海水脱硫和湿式电除尘环保设备进、出口的CPM进行了测试.结果表明:在机组300MW高负荷和150MW低负荷条件下,上述3个环保设备能够有效脱除CPM,总CPM整体脱除率分别为97.2％和97.6％,对应排放质量浓度分别为5.58mg/m3和5.55mg/m3;干式电除尘和湿式电除尘对无机CPM的脱除效率大于对有机CPM的脱除效率;海水脱硫整体对CPM脱除作用显著,但会将海水中大量存在的Cl-离子和Na+离子带入烟气中形成一部分新的CPM,下游的湿式电除尘则能够将这些新生成的CPM脱除,最终保证了 CPM的低浓度排放.

The transfer characteristics and removal capability of Hg in ultra-low emission facilities such as selective catalytic reduction (SCR), low temperature electrostatic precipitator, seawater desulfurization and wet electrostatic precipitator in a 300 MW coal-fired boiler of a power plant were studied under different working conditions and different types of coal. The results show that under different working conditions, the total emission concentration of mercury is basically 1.16-2.90 μg/m3. The final release of mercury into the atmosphere is mainly composed of elemental mercury and a small amount of oxidized mercury, the particulate mercury was completely removed. Most mercury is removed in seawater flue gas desulfurization. The overall removal efficiency of mercury of low temperature electric precipitator, a seawater flue gas desulfurization scrubber and wet electric precipitator is 25%, 62% and 37% respectively on average. The proportion of Hg2+ is the key to affect the efficiency of mercury removal in flue gas, and the higher proportion of Hg2+ in flue gas is beneficial to obtain higher efficiency in electrostatic precipitators and seawater flue gas desulfurization devices. In the 300 MW coal-fired boiler of a power plant equipped with a selective catalytic reduction unit, a low temperature electrostatic precipitator, a seawater flue gas desulfurization scrubber, and a wet electrostatic precipitator and other ultra-low emission facilities, the average removal rate of total mercury is about 83%, which can achieve greater levels of mercury removal.

As the emission of condensable particulate matter (CPM) could exacerbate haze pollution, recently it has received more attention. In this study, CPM and its organic components were tested at different sampling sites of a flue gas purification system under the Coal 1 and Coal 2 combustion conditions, respectively. The top 10 organic components in CPM were analyzed. The results show that under the Coal 1 and Coal 2 combustion conditions, the mass emissions of CPM at the stack inlet are 4.2 and 5.6 mg/m3, respectively, and the removal efficiency of CPM by pollution control facilities after ultra-low emission transformation are 97.21% and 98.18%, respectively. In particular, the removal rates of the organic CPM by the low-low temperature electrostatic precipitator (LLTESP), the sea water wet flue-gas desulfurization (SWFGD) and the wet electrostatic precipitator (WESP) are 71.82%, 56.36% and 76.61% by average, respectively. Among them, LLTSEP exhibits general removal effect on esters, hydrocarbon and all other organic compounds. In comparison, SWFGD excels in the removal of the hydrocarbon compounds, while WESP has remarkable performance on reducing ester compounds.

燃料成本是火电厂成本中占比最大的一项,通常为75%～85%,国投北部湾发电有限公司设计煤种为无烟煤,近年无烟煤供应量下降,价格不断上涨,与烟煤的差价越来越大。为保证煤炭供应,降低成本,该公司通过对煤炭市场调研,决定采取无烟煤掺烧烟煤这一举措,平衡燃料成本上涨,缓解经营压力,同时降低NOX排放。本文通过介绍燃煤掺配、燃烧调整、制粉系统治理,探索了保证锅炉掺烧烟煤的安全性和提高锅炉运行经济性的有效途径,为同类机组燃煤掺烧提供参考。

分析了密封油在运行中从密封油系统进入氢冷发电机的原因,提出了防止发电机进油的措施.