基于煤炭洗选工艺的火电厂CO2减排潜力分析

考虑从煤炭购买、洗选到发电过程及后续污染物处理的火电生产流程,建立了以最小发电成本为目标的火电企业CO2排放控制模型.以某火力发电厂为例,依据该厂逐月生产运行数据,污染处理及CO2减排控制能耗,核算了火力发电全流程不同环节的CO2排放量.采用情景分析方法对不同碳捕集技术下的发电成本及CO2排放量进行对比分析,结果表明：该火电厂燃煤发电所排放的CO2占其全部CO2排放量的96.00％,洗煤排放的CO2仅占0.38％,污染物处理间接和直接排放的CO2占3.62％.当采用吸收分离法、膜分离法和物理吸附法进行CO2捕集时,分别可以减少71.60％、76.47％和86.06％的CO2排放,发电成本则依次增加31.16％、41.52％和79.44％.

Analysis on CO2 Emission Reduction Potential of Thermal Power Plants Based on Coal Washing Process

A model of CO2 discharge control aiming at minimizing generating cost is established for thermal power plants in consideration of the total thermal power generation process from coal purchase, coal washing, electricity generation to pollutant disposal. According to the monthly production data, the energy consumption of pollutant treatment and CO2 emission reduction control of a thermal power plant, the CO2 emissions in different stages of the generation process are calculated with this model. The scenario analysis approach is adopted to analyze the impacts of different carbon capture technologies on the generating cost and CO, emissions. The result shows that the CO2 emissions of coal-fired generation account for 96.00% of the total CO2 emissions of the power plant, those of coal washing only account fur 0.38% and the CO2 amount discharged by direct and indirect pollutant disposal account for 3.62% of the total emissions. When the CO2 capture is performed by using the extraction absorption, membrane process or physical adsorption methods respectively, the CO2 emissions can be reduced by 71.60%, 76.47% and 86.06% accordingly, but the generation cost will increase by 31.16%, 41.52% and 79.44%.