【摘要】 回收汽轮机乏汽余热用于供热,具有显著的节能效果。以某330 MW直接空冷机组为例,建立了回收乏汽余热的高背压供热机组热力性能计算模型,对比了高背压供热方式和传统供热方式的性能,分析了主要因素对供热系统性能的影响。结果表明,与传统供热方式相比,高背压供热方式可以节省大量的高品质抽汽,可使汽轮机的发电功率增加21.8 MW,发电标准煤耗率降低22.9 g/k W·h。随着热网返回水温的升高,高背压供热机组的发电功率逐渐降低,发电标准煤耗率逐渐升高,高背压供热方式更适合热网返回水温度较低的供热系统。热网水量增加,使高背压供热机组的发电功率减少,发电标准煤耗率降低,高背压供热方式更适合于热网水量大、供热量大的供热系统。更多还原

【Abstract】 Surplus heat utilization of the turbine can save great energy. Taking a 330 MW direct air- cooled unit as an example,the calculation model of high back pressure cogeneration unit with surplus heat recovery is built,and comparison of the heating supply performance between the high back pressure mode and traditional mode is also conducted. Afterwards,the factors influencing high back pressure cogeneration unit are investigated. The results show that high back pressure mode can save much high quality extracted steam,comparing with traditional mode,which increases turbine power by 21. 8 MW and decreases coal consumption rate by 22. 9 g / k W·h. The turbine power of high back pressure mode decreases gradually with the increase of the return water temperature,while the coal consumption rate enhances. It shows that high back pressure mode is more suitable for the heating system with a lower return water temperature. The enhancement of heating water flow decreases the turbine power as well as the coal consumption rate,which denotes that high back pressure mode more suitable for the heating system with a higher heating load.更多还原