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什么是飽和水蒸氣 什么是過熱水蒸氣

水加熱至沸騰產生的水蒸氣,叫飽和水蒸氣。此時水蒸氣的溫度等于飽和溫度。不含飽和水滴的飽和水蒸氣叫干飽和水蒸氣;含有飽和水滴的水蒸氣,叫濕飽和水蒸氣。溫度低于飽和溫度的水蒸氣,稱為過冷水蒸氣。過冷水蒸氣是不穩定的,稍有擾動就會將部分過冷水蒸氣冷凝成飽和水,并釋放出熱量將溫度提高到飽和溫度,使過冷水蒸氣變成濕飽和水蒸氣。

繼續加熱干飽和水蒸氣,其溫度將升高并超過飽和溫度。這種超過飽和溫度的水蒸氣,稱為過熱水蒸氣。



高出飽和溫度的溫度數,稱為過熱度。例如:鍋爐出口水蒸氣的絕對壓力為9.81兆帕,溫度為5409℃。則過熱度為540一309.53 = 230.47℃(絕對壓力為9.81兆帕下的飽和溫度為309.53℃)。


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