蒸汽管网辅助热电联产机组调频蓄等效转化特性研究

Taking the combined heat and power (CHP) supplying industrial steam as the research object, the dynamic model of the steam pipe network was developed. Then, the frequency regulation capability of CHP unit assisted with steam distribution system was studied. The exergy storage equivalent conversion rate of steam distribution system under different operating conditions was analyzed. Results show that, when the extraction valve is kept closing for 30 s, the user side steam pressure reaches the lower limit value, and the additional cumulative power generation is 307 kW·h. When the extraction valve is totally closed, the exergy storage equivalent conversion rate is 84.6%, 82.8% and 81.5% as the power load of CHP unit is 700 MW, 900 MW and 1 000 MW,respectively. The faster the action of the extraction valve is, the faster the CHP plant power rises. When the valve closing time is 5 s, the maximum CHP plant power climbing rate is 9.77 MW/s. The variable load rate increases when the CHP unit assisted steam distribution system in frequency regulation, and the operation flexibility of CHP unit can be enhanced.