![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
已知超临界压力锅炉的主蒸汽压力p 1 =27.4MPa,主蒸汽温度t 1 =605℃,分离器蒸汽温度t f =434℃,再热蒸汽压力p 2 =5.94MPa,再热蒸汽温度t 2 =603℃,再热蒸汽入口温度t 0 =370℃,给水温度t gs =296℃,省出口水温度t sm =320℃,已知条件列,计算该压力下过热器中加热过程的Pr并对计算结果进行分析与讨论。 27.4MPa锅炉的过热器特性参数 t (℃) u×10 -6 [kg/(m·s)] c p [kJ/(kg·K)] λ×10 -3 [W/(m·K)] t (℃) u×10 -6 [kg/(m·s)] c p [kJ/(kg·K)] λ×10 -3 [W/(m·K)] 440 30 6.517 127.4 530 32 3.585 104.6 450 30 5.776 120.5 540 33 3.477 104.6 460 30 5.239 115.6 550 33 3.383 104.8 470 30 4.831 112.0 560 33 3.302 105.1 480 30 4.509 109.4 570 34 3.231 105.6 490 31 4.249 107.6 580 34 3.168 106.2 500 31 4.036 106.2 590 34 3.113 106.9 510 31 3.859 105.4 600 35 3.064 107.6 520 32 3.711 104.8 605 35 3.041 108.0