According to need, furnace atmosphere, protective atmosphere or vacuum can be a normal atmosphere.
根据需要，炉内气氛可以是普通气氛、保护气氛或真空。
Liquid nitrogen is adopted as protective atmosphere in bell type furnace for which vacuum pumping system are provide also.
在罩式电炉内处理，采取液氮作为保护气体，并设真空抽气设备。
B. Continuous decomposed ammonia protective atmosphere annealing furnace.
连续式氨分解保护气氛退火炉。
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