Liquid nitrogen is adopted as protective atmosphere in belltypefurnace 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。
2
This paper introduces the national building process of the belltypefurnace. The furnace linings USES the home built refractory to replace the input products.
本文介绍了罩式炉国产化改造过程中，以国产耐火材料替代进口高级耐火材料作炉衬的应用及进展。
3
It was proved that the grid inner cover could improve the heat transfer efficiency and throughput of the bell-type annealing furnace.