供工业蒸汽热电联产机组滑参数运行的灵活性与经济性分析

Supplying industrial steam can achieve combined heat and power generation, and it is an effective way to enhance the energy efficiency and economic performances of coal-fired power generation units. However, the high extraction temperature entering the industrial steam pipeline limits the operational flexibility, when the combined heat and power unit operates under low power load condition. To address this issue, a parameter sliding operation strategy by reducing the reheat steam temperature was proposed in this study. Then, the system performance analysis model under variable operating conditions was developed, and the flexibility and energy consumption characteristics of the system were analyzed with a 330 MW combined heat and power unit as the reference case. The results show that the maximum peak shaving capacity of the unit increases by about 14% with the operation mode of reheat steam temperature sliding, and the coal consumption rate of the unit can be reduced after the temperature of the reheated steam is reduced to a certain extent. Under typical heating conditions, the annual operating income of the operation mode of reheat steam temperature sliding is about 788400 CNY.