為什么鍋爐過量空氣系數(shù)增加，汽溫升高?

??2022-08-05????????

鍋爐過量空氣系數(shù)增加(假定原先是最佳過量空氣系數(shù))，爐膛內(nèi)的溫度下降，使水冷壁吸收的輻射熱量減少，爐膛出口的煙氣溫度略有下降。由于煙氣量增加，煙速提高，使傳熱系數(shù)增加的幅度大于傳熱溫差減少的幅度，因此，使過熱器的吸熱量增加。由于排煙溫度和煙氣量增加，q2增加，鍋爐效率降低，在燃料量不變的情況下.蒸發(fā)量減少，因此，汽溫升高。一般說來，過量空氣系數(shù)每增加0.1，汽溫升高8～10℃。如果爐膛的過量空氣系數(shù)已經(jīng)較高時，則過量空氣系數(shù)進一步增加，汽溫升高的幅度下降。如果過量空氣系數(shù)太大，可能會因為爐膛溫度和爐膛出口煙氣溫度大大降低，過熱器因傳熱溫差下降太多而使汽溫下降，這種情況只有在很惡劣的燃燒工況下才會出現(xiàn)。

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国产精品网址-国产精品无-国产精品无码-国产精品无码AV-国产精品无码白浆高潮-国产精品无码不卡-国产精品无码无码-国产精品无码在线

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為什么鍋爐過量空氣系數(shù)增加，汽溫升高?

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