为了对增设背压机的抽汽供热机组能耗指标进行评价和对机组改造的可行性进行评估，根据能量梯级利用原理，利用EBISLON软件建模，进行了增加背压机后供热机组的变工况计算，明确了该种供热模式下的供热负荷、发电负荷和供电负荷等边界条件变化关系和节能量。结果表明：某300 MW纯凝改供热机组增设一台10 MW背压发电机组后，机组供电煤耗降低5.671~7.725 g/（kW•h），增设背压机后节能效果明显。

In order to evaluate the feasibility of the unit transformation and the energy consumption index of the extraction heating unit with the addition of back pressure machine,the variable working conditions of the heating unit were calculated by using EBISLON software modeling according to the principle of energy cascade utilization.The boundary conditions of heating load,power generation load,power supply load and the energy saving of this mode are also defined.The calculation results show that the coal consumption of power supply decreases by 5.671-7.725 g/(kW•h） after the addition of a 10 MW back pressure turbine in a 300 MW pure condensing unit.The energy saving effect is obvious after the addition of a back pressure machine.

TK264.1

国家重点研发计划资助项目(2017YFB0902100)