6FC5210-0DF03-0AA0
循環(huán)流化床是一種適于固體燃料的清潔高效的燃燒技術(shù)。固體顆粒(燃料、石灰石、砂粒、爐渣等)在爐膛內(nèi)以一種特殊的氣固流動方式(流態(tài)化)運動,離開爐膛的顆粒又被分離并送回爐膛循環(huán)燃燒。爐膛內(nèi)固體顆粒的濃度高,燃燒、傳質(zhì)、傳熱、混合劇烈,溫度分布均勻,固體顆粒在爐膛內(nèi)的內(nèi)循環(huán)和外循環(huán)十分強烈,在爐膛內(nèi)的停留時間較長,保證了較高的燃燒效率。
其較為典型的燃燒工藝如圖1所示。

圖1 循環(huán)流化床鍋爐系統(tǒng)示意圖
循環(huán)流化床燃燒技術(shù)是近二十多年來發(fā)展的潔凈煤燃燒技術(shù),其燃燒方式特別適用于高灰分、低揮發(fā)份的煤矸石、洗中煤等劣質(zhì)煤,具有較好的燃料適應(yīng)性,可變廢為寶,體現(xiàn)節(jié)能要求。另外,循環(huán)流化床鍋爐在燃燒過程采用爐內(nèi)噴鈣、低溫燃燒,可同時達到脫硫脫硝的目的,具有較好的環(huán)保特性。
燃料由給煤機送入爐膛;一次風由鍋爐底部送入,主要用于維持燃料粒的流化;二次風沿燃燒室側(cè)壁多點送入,主要用于增加燃燒室的氧量,提高燃燒效率;燃燒后的大量顆粒隨煙氣進入旋風分離器,與煙氣分離;分離出來的顆粒經(jīng)回料閥回到燃燒室繼續(xù)燃燒;分離出來的煙氣則經(jīng)過除塵器除塵后,由引風機引入煙囪排出。實際運行中,循環(huán)流化床的燃燒效率可高達97%~99%。
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