Flue ducts for directing hot gas from fires to heat chambers have been found at some sites, but are very rare.
2.
Two sets of regenerative flue ducts allowed for the air flow to be reversed at regular intervals, and thus maintain a high temperature in the incoming air.
3.
Hot gas was drawn from the furnaces through the pendants, water tube economisers, rotating heat exchanger, cyclone dust collectors and electrostatic precipitators by two induced draught fans before entering the chimney flue ducts and passing up the high chimneys.
4.
When the flue duct is thoroughly heated, air flow is reversed and the flue duct becomes the air inlet, releasing its heat into the incoming air, and allowing for higher furnace temperatures than can be attained with air-fuel only.
5.
When the flue duct is thoroughly heated, air flow is reversed and the flue duct becomes the air inlet, releasing its heat into the incoming air, and allowing for higher furnace temperatures than can be attained with air-fuel only.
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