Furnace temperature from 1400 ℃ to 2500 ℃, improving the structure of the furnace tube assembly can be replaced rapidly furnace tube; Infrared temperature measurement and control, a variety of way of pushing the boat, optional automatic device into the boat, the boat (a handling multiple boat), choose with automatic can prevent air enters the furnace to a large number of air curtain door, more safe and beneficial to improve the life of furnace tube. In order to meet user demand for power grid balance, can provide three single-phase transformer phase transition. This furnace is suitable for the production of coarse tungsten carbide powder, lower equipment cost.