热电厂不同采暖抽汽压力对经济性的影响

结合热负荷延续图的负荷分配,分析了采用两种相同容量但采暖抽汽压力不同的供热机组的能量损失差别,以及在相同的进汽量条件下,要获得相同的供热量,两种汽轮机的发电功率的不同。在满足热网换热器传热端差要求的条件下,供给采暖热用户的抽凝机的抽汽压力或背压机组的排汽压力应尽可能降低,以利提高热电厂能源利用率和经济性。在制造和选择供热汽轮机时除了要考虑热化系数之外,还应注重抽汽或排汽压力与热负荷能级品位的匹配。

The Influence of Different Pressure of Extraction Steam for Heating on the Economy Feature of the Thermal Power Plant

Accroding to heat load duration diagram,the article analyzed the different loss between two heating unit that have identical capacity but different extraction steam pressure,and the difference of generate power when the amount of the steam that enter the turbine and heat load are equel.When the terminal difference of the heat exchanger is adequate,the pressure of extraction steam or exhaust of back pressure turbine should be reduced as much as possible,so as to improve the utilization rate and economy feature of the thermal power plant.When the turbine is produced or choosen,we should consider not only the coefficient of heat supply,but also the matching of the energy level between the steam pressure and heat load.