660 MW燃煤机组掺烧生物质能耗及碳排放特性研究

Research on Energy Consumption and Carbon Emission Characteristics of Biomass Co-firing in a 660 MW Coal-fired Power Unit

为了准确掌握生物质耦合发电机组能耗及碳排放水平,提出了生物质耦合发电机组燃料耗率和燃煤耗率的计算方法,并在某660 MW燃煤机组上开展了生物质炉内掺烧性能试验研究。试验结果表明:机组掺烧生物质时,由于锅炉效率下降和厂用电率上升,机组燃料耗率有一定程度的恶化趋势,而机组燃煤耗率却有一定程度的改善趋势;排烟热损失和机械未完全燃烧热损失的增加导致锅炉效率下降,生物质粉碎机及输送风机电耗的增加造成厂用电率上升;生物质掺烧比例越大,锅炉效率下降量越大,机组厂用电率上升量越大,机组燃料耗率上升量越大,机组燃煤耗率下降量越大;在机组负荷350 MW、生物质掺烧量10 t/h时,机组供电燃料耗率上升1.966 g/(kW·h),机组供电燃煤耗率下降11.858 g/(kW·h),机组碳减排量12.40 t/h。

In order to accurately obtain the energy consumption and carbon emission characteristics of biomass coupled power plant,the calculation method of fuel consumption rate and coal consumption rate of the biomass coupled power unit was proposed,and the performance test of biomass co-firing in furnace was conducted in a 660 MW coal-fired power unit.The research results show that during biomass co-firing,the fuel consumption rate has a certain deteriorative tendency due to the drop in boiler efficiency and the rise in auxiliary power consumption ratio,while the coal consumption has a certain improvement tendency.The drop in boiler efficiency is caused by the rise in heat losses due to exhaust and unburned carbon in refuse.The rise in auxiliary power consumption ratio is due to the rise in power consumption of the biomass disintegrator and conveying fan.The higher the biomass blending ratio,the larger drop in boiler efficiency,the larger rise in auxiliary power consumption ratio,the larger rise in fuel consumption rate,and the larger drop in coal consumption rate.When the unit load is 350 MW and the biomass blending quantity is 10 t/h,the net fuel consumption rate increases by 1.966 g/(kW·h),the net coal consumption rate decreases by 11.858 g/(kW·h),and the unit carbon emission reduction is 12.40 t/h.