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2017-03-10View Original

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我们经常遇到进入到背压式汽轮机的中压蒸汽压力下降,导致调速阀几乎全开,现在能不能当蒸汽压力下降时,为确保生产正常,把蒸汽出口改放空,降低背压而保持转数
Reply #22017-03-11
有这么干的,不过上策还是联系上游恢复供蒸汽
Reply #32017-03-11
可以降低加工量,改放空浪费能耗,另外就是联系调度查找中压蒸汽压力低的原因,及时恢复中压压力!
Reply #42017-03-11
可以,我们也干过(适当降低低压蒸汽压力)
Reply #52017-03-12
我觉得你这时候应该注意入口蒸汽的温度,温度会随压力下降的。如果调速阀都全开了,说明蒸汽压力下降很多了。 温度下降会使蒸汽带水,对叶轮造成冲击。
Reply #62017-03-12
我们中压蒸汽3.5mpa,在温度低于380℃时,都建议紧急停车的
Reply #72017-03-13
越降加工量不是产气越少,压力越低
Reply #82017-03-13
蒸汽应该不会带水,因为只要炉子不熄灭,饱和蒸汽从炉子出来就是过热蒸汽
Reply #92017-03-13
你们蒸汽是自产自用的,没有蒸汽管网么?
Reply #102017-03-13
饱和蒸汽到过热蒸汽有一个蒸汽指标是干度,干度下降会增加蒸汽的液化倾向,对于汽轮机高线速的情况下是有一定风险的。 当然,不考虑机组的话,适当降低背压是可以维持压缩机转速的
Reply #112017-03-22
汽轮机是靠蒸汽焓差工作的,短时间是可以的,长时间是不行的。汽轮机的设计安装是有设计温度的。叶轮尾叶有抗“”水蚀“”设计,但蒸汽压力过低会造成背压蒸汽含水过高,“”水蚀“”加剧,损害叶轮叶片,严重会水冲击折断叶片。
Reply #122017-04-19
只要蒸汽不带水,适当降低背压是没什么问题的,我们厂的蒸汽老是不稳,我们也是一直降背压维持生产

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