燃煤机组超低排放系统成本分析及经济性运行策略

Cost analysis and economic operation measures for ultra-low emission system of coal-fired unit

为了探究典型燃煤机组超低排放系统的经济性运行区间以及经济性优化策略,建立了长三角区域115台燃煤机组(共计79370 MW)超低排放技术路线数据库;通过建立污染物控制技术成本评估模型,探究了机组容量、煤质、运行时间和“上大压小”策略对运行成本的影响。针对典型超低排放技术路线,机组容量由100 MW增加至1000 MW时,超低排放系统运行成本由0.051元·(kWh)^(−1)下降至0.027元·(kWh)^(−1)。根据环保电价补贴,将超低排放系统运行成本划分成了4个区间。当超低排放电价补贴为0时,600 MW及1000 MW机组超低排放系统原有的环保电价补贴仍可满足超低排放系统运行的成本要求。“上大压小”策略可以显著降低污染物控制成本,在实现相同发电量的情况下,如果用3台1000 MW燃煤机组替代10台300 MW燃煤机组,SO_(2)、NOx及PM控制年运行成本下降幅度分别为20.7%、27.6%和34.4%。本研究结果可为燃煤电厂超低排放系统的经济性运行提供参考。

In order to explore the economic operation range and economic optimization strategy of the ultralow emission(ULE)system for coal-fired units,the database of ULE technology routes for 115 coal-fired units(79370 MW)in the Yangtze River Delta region was established.Through the establishment of a cost evaluation model for pollutant control technology,the impact of unit capacity,coal quality,operating hour,and the strategy of constructing large units and restricting small ones on the operating cost was investigated.For the typical ULE technical route,the operating cost of the ULE system decreased from 0.051 Yuan·(kWh)^(−1) to 0.027 Yuan·(kWh)^(−1) with the unit capacity increasing from 100 MW to 1000 MW.The operating cost of the ULE system was divided into 4 ranges on the basis of the environment-protecting electricity price subsidy policy.When the ULE electricity price subsidy was cancelled,the original environment protection price subsides for ULE systems of 600 and 1000 MW coal-fired units could still cover the operating cost of ULE system.The“constructing large units and restricting small ones”strategy could significantly reduce the cost of pollutant control.When ten 300 MW coal-fired units were replaced by three 1000 MW coal-fired units,the annual operating costs of SO_(2),NOx and PM control decreased by 20.7%,27.6%and 34.4%,respectively.The results of this study can provide a reference for the economic operation of ULE systems in coal-fired power plants.