![]() What are refractories?Īs the high temperature is generated inside the heater so it is necessary to prevent the environment from exposure to high temperatures. At the top of the stack, absolute pressure should be 2.5 mm WC below the atmosphere to keep the heater at the negative draft. Stacks are mostly made of steel plates of minimum 6 mm thickness and lined with 50 mm insulating castable. The velocity of flue gas through the stack is maintained between 25 to 40 ft/sec. We all know air density depends on air temperature. ![]() It helps ventilation as well as air ingression to the fire heater based on buoyancy which is generated due to density difference. Stack is the vertical pipe through which combusted gas or flue gas is vented out into the atmosphere.
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