Negative pressure to positive pressure
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During the furnace heating process, at what temperature does positive pressure start to be applied? Why do we need to switch to positive pressure? Can someone give a detailed explanation?
Turning the furnace to positive pressure means switching to positive pressure when the pressure at the viewing port reaches 200°C. Before lighting the small burner in the furnace’s carbonization chamber, the chimney and flues have already been heated, creating a suction effect. In the early stages of furnace heating, the masonry contains a high amount of moisture, so less heat is available; the observation holes are under negative pressure. At 250°C, before removing the cover, the pressure should be changed to positive to reduce the intake of cold air and ensure uniform temperature throughout the carbonization chamber.