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氧氣濃度的變化對煤粉燃燒產生很大的影響

2015-01-29 點擊數：1451
氧氣濃度的變化對煤粉燃燒產生很大的影響，增加氧氣濃度會降低著火熱和著火溫度，增加反應速度、提高火焰溫度、促進完全燃燒。目前，世界上火力發電廠煤粉鍋爐基本上都是用油點火或助燃，每年的耗油量是巨大的。如果可以利用富氧空氣(高氧氣濃度的空氣)助燃煤粉、替代電廠點火用油，其經濟效益將十分可觀。 本文選用了從褐煤到貧煤的不同煤樣，在沉降爐和熱天平兩種試驗臺上進行了煤粉的富氧燃燒試驗。 在沉降爐中，著火溫度隨氧氣濃度的增加而降低。低揮發分的貧煤對氧氣濃度變化最為敏感，氧濃度由16％增加到36％，著火溫度下降24％，絕對值降低147℃，而褐煤卡列那的著火溫度隨氧氣濃度變化最小，僅下降36℃，但由于其本身的著火溫度較低，所以降幅也達到12％。四種煙煤的趨勢居于貧煤和褐煤之間，著火溫度下降15％左右，絕對值下降60～100℃，且煙煤的著火溫度在氧氣濃度達到26％后，下降的速度降低。通過改變沉降爐內的煤粉濃度的實驗，我們可以發現：氧氣濃度增加，消弱了煤粉濃度對著火溫度的影響。同樣不同氧氣濃度下煤粉細度對著火溫度的影響很小，且基本相近。 在熱天平中，不同的煤種隨著氧濃度的增加最大燃燒...
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