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| back draught; back draughting | |||
| draught back; back-draughting | |||
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| back-drafting (【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。); draught back | |||
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倒流休风 : 7 phrases in 1 subject |
| Metallurgy | 7 |
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