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Thermal calculation of air preheater

2019-08-08View Original

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An external circulation air preheater is installed at the flue gas outlet of the industrial boiler. It is known that the flue gas temperature at the inlet of the air preheater is 280°C, the flue gas temperature at the outlet is 150°C, the temperature of the cold air at the inlet is 20°C, and the volume flow rate of the cold air is 3000 cubic meters. Calculate the temperature of the hot air. How should this cold air flow rate be determined? Referring to the calculations for industrial boilers doesn’t help in arriving at an appropriate temperature.

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