中文摘要：

在煤电机组超低排放趋势背景下,煤电企业需积极开展燃煤电厂大气污染物排放控制关键技术研究,快速推进环保升级改造,以期实现低成本下燃煤机组大气污染物的超低排放。基于环境审计中成本效益估算原则,收集实际工程案例投资和运行参数,建立了烟气脱硫、脱硝技术费效数据库,评估了燃煤电厂典型大气污染物控制技术的费用效益。烟气脱硫技术中,循环流化床半干法单位装机容量的系统初投资、年运行费用分别为25.78万、5.68万元/MW,均高于石灰石/石膏湿法。烟气脱硝技术中,选择性催化还原（SCR）技术的效费比仅为1.15,显著低于选择性非催化还原（SNCR）技术（1.63）和SNCR/SCR联用技术（1.36）,但SCR技术脱硝效率高达80%,而SNCR技术的脱硝效率仅为30%,因此脱硝技术选型时不宜将效费比作为唯一参考指标。

英文摘要：

In the context of ultra-low emission,coal power enterprises should actively carry out technical research on air pollutants control and speed up the environmental upgrades to achieve ultra-low emission with low cost. By applying the principle of cost-benefit in environmental auditing,the cost and benefit of typical air pollution control technologies in coalfired power plants in China were evaluated by collecting the investment and operating parameters of actual engineering cases and establishing the cost-benefit database of flue gas desulfurization and denitration technologies. The indexes of system initial investment and annual operating expenses of circulating fluidized bed semi-dry desulfurization technology were 2. 578 ×10^5,5. 68 × 10^4yuan/MW,all of which were higher than the wet limestone/gypsum desulfurization technology. The ratio of benefit to cost of selective catalytic reduction（ SCR） technology was 1. 15,obviously lower than those of selective non-catalytic reduction（ SNCR） of 1. 63 and SNCR/SCR technology of 1. 36. However,the denitration efficiency of SCR technology reached at nearly 80%,much higher than that of SNCR technology（ 30%）. Therefore,the ratio of benefit to cost should not be identified as the only index in denitration technology selection.