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Introduction to the low temperature protection system of heat exchanger
Aug 26, 2020

Avoiding smoke temperature too low is an effective measure to prevent low temperature dew point corrosion. Bypass is set on the air flow, and the valve on the bypass pipe is adjusted according to the flue gas temperature at the outlet of the heat exchanger. When the smoke temperature is too low, part of the cold air flows directly through the bypass pipe without passing through the heat exchanger, so as to reduce the heat exchange and increase the smoke exhaust temperature. If there is a gas heat exchanger behind the air heat exchanger then the gas temperature after the gas heat exchanger is the control basis. This technology is common in the design of foreign major furnace companies, but has not been used in China. Flow chart of low temperature protection system for heat exchanger.

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