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back-drafting
met.
【铁】 倒流休风
(【技】将休风后高炉内残留的煤气通过热风管道倒流,经热风炉或专用的倒流烟囱排除的休风操作。高炉休风初期,由于炉内还残留有大量煤气,若需要更换风口、渣口等设备时,会有大量的煤气从风口喷出,影响操作和人身安全。采取倒流休风,便可以避免此类事故的发生。倒流休风有两种方法:一种是利用热风炉,使煤气经烟道流人烟囱抽出;另一种是在热风总管的尾端建专用的倒流烟囱,不经热风炉直接将残留煤气排出。)
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