The tubular furnace is a vertical furnace, composed of gas burner, tube radiation chamber, convection chamber, chimney and other main parts, of which the gas burner fire size, by its adjustment sleeve manual adjustment: the furnace barrel is trapped column shape, the wall is welded with refractory short steel plate, the inner wall is not less than 120 mm thick refractory material, to ensure that the barrel to withstand higher temperatures. The pipe is welded with stainless steel or carbon steel pipe (the material depends on the user's needs), and the chimney is equipped with an adjustable damper to ensure the working efficiency of the system.