Vacuum annealing furnace process layout

The process layout of the vacuum annealing furnace: the preheating section of the furnace; A downward direct combustion passage; Horizontal radiation tube heating section; The mean heat transfer of electric radiation tube; The cooling section of the gas jet is protected. The nose system of the furnace. In the annealing process, the strip first enters the furnace through the double seal of the preheating section of the upward stroke, and the preheating segment is heated by the combustion product of the direct combustion section. After annealing furnace preheating section of strip through the vertical channel, by 18 ℃ to arrive at the top of the dual steering roller stroke without oxidation direct combustion period; The furnace of the direct combustion section has 4 control areas with 42 burner mouths. The first 3 control areas have 12 burner mouths each, and the 4 control areas have 6 burner mouths. Air and excessive coke oven gas mixture combustion to ensure the atmosphere of reduction in the furnace.

The strip steel by direct combustion, and the steering roll at the bottom of the level of 90 ℃ in radiant tube heating period (level of radiant tube heating period of five control points, a total of 60 radiant tube), the heat to the product level required by the final annealing temperature (under protective atmosphere of radiant tube heating period of complete) after the soaking zone (soaking around 10 s), and then into protective gas jet cooling section, cooler will protect gas cycle injection to strip on both sides to promote its rapid cooling (35 ℃ / s).

When the strip reaches the proper temperature, it passes through the exit section. The exit segment consists of a steering ramp. The annealing furnace has a temperature balance for a short period of time before plating, and then it is placed in the bottom zinc pot through the inclined downward alloy furnace nose.