摘要
随着“碳达峰”和“碳中和”政策的实施,电厂的节能减排已迫在眉睫,热电联产是实现节能减排的重要手段。以300 MW直接空冷机组高背压供热机组为案例,研究机组高背压供热系统经济运行和经济评价指标的计算方法。研究结果表明:在相同供热负荷工况下,高背压供热最大电功率比抽汽供热最大电功率大,高背压供热折算功率变化量随着高背压供热比的增大先增大后减小;随着供热负荷的增大,高背压供热最佳背压先增大,后不变,最后减小;随着热网回水温度的升高,机组冷端可吸收的热负荷逐渐降低,单位热负荷损失电量升高。当热网回水温度达到63.2℃时,高背压供热单位热负荷损失电量与增发电量相等,此温度以上高背压供热系统退出。
With the implementation of the "carbon peak" and "carbon neutrality" policies, the energy conservation and emission reduction of power plants are imminent, and cogeneration is an important means to achieve energy conservation and emission reduction. This paper took the high back pressure heating unit of 300 MW direct air cooling unit as an example to study the calculation method of economic operation and economic evaluation indicators of the high back pressure heating system of the unit.The results show that under the same heating load, the maximum electric power of high back pressure heating is greater than that of extraction heating, and the change of high back pressure heating converted power increases first and then decreases with the proportion of high back pressure heating increasing;with the increase of heating load, the optimal back pressure for high back pressure heating first increases, then does not change, and finally decreases;with the increase of the return water temperature of the heat supply network, the heat load that can be absorbed at the cold end of the unit gradually decreases, and the power loss per unit heat load increases. When the return water temperature reaches 63.2 ℃, the unit heat load loss of high back pressure heating is equal to the additional power generation, and the high back pressure heating system will exit above this temperature.
作者
薛康康
XUE Kangkang(Northwest Electric Power Test Research Institute,China Datang Corporation Science&Technology General Research Institute Co.,Ltd.,Xi'an 710065,Shaanxi,China)
出处
《能源与节能》
2022年第12期25-27,32,共4页
Energy and Energy Conservation
关键词
供热机组
高背压供热
供热占比
折算功率变化量
heating unit
high back pressure heating
heating proportion
converted power variation
