自备电厂热电解耦方案及其特性分析

Characteristic analysis and decoupling scheme of thermoelectric decoupling based on factory-owned power plant

目前自备电厂发电功率较大,在未来新能源并网调峰中不容忽视。根据选取的具备供电与热的自备电厂,确定低压缸零出力、高背压抽汽联合乏汽供热、吸收式热泵和压缩式热泵4种热电解耦优化方案,定量计算评估4种方案优化后电厂最大供热与电负荷率的降低情况。对案例机组采用4种方案进行优化,计算结果显示:案例机组对4种优化方案的最大供热量可分别提高174.00、136.18、168.37、38.00 MW;在原最大供热负荷下,最低电负荷率分别降低到44.29%、73.29%、73.70%和80.57%,最大热电比分别达到2.00、1.50、1.50、1.15;其中低压缸零出力解耦优化效果最明显,最大供热量提升最多,电负荷率降低也最多。经济分析显示,吸收式热泵方案与其他方案相比增加的投资成本最多。

At present,the self-provided power plant has a large generating power,which can not be ignored in the future new energy grid-connected peak regulation.According to the selected factory-owned power plant with power and heat supply,there are the low-pressure cylinder zero output scheme,high back pressure extraction combined exhaust steam heating scheme,absorption heat pump and compression heat pump scheme.four thermo-electrolytic coupling schemes are quantitatively calculated and evaluated to provide guidance for the selection of decoupling schemes for factory-owned power plants.Four schemes were used to optimize the case unit,and the calculation results showed that after decoupling,the heat supply of the heating extraction stage can be separately increase 174.00 MW,136.18 MW,168.37 MW and 38.00 MW.The minimum electric load rate was reduced to 44.29%,73.29%,73.70% and 80.57%.The maximum heat-to-electricity ratio reached 2.00,1.50,1.50 and 1.15.The zerooutput decoupling effect of the low-pressure cylinder is the most obvious,the maximum heat supply increases the most,and the electric load rate decreases the most.Economic analysis shows that the absorption heat pump scheme has the most increased investment cost compared to other schemes.