Issues with flue gas temperature in heating furnaces
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Recently, efforts to control the thermal efficiency of the furnace have resulted in too low flue gas temperatures. I’m not sure if there are any good ways to appropriately increase the flue gas temperature There is steam superheating in the convection section.
Short-circuiting the economizer causes the efficiency to drop immediately
The flue gas temperature at the outlet of the short-circuited convection section is lower; short-circuiting superheated steam is better.
The air supply follows a bypass route, resulting in less heat exchange with the flue gas, and thus the flue gas temperature remains lower
Activate the heating line to raise the flue gas temperature; low temperatures can lead to dew point corrosion
Check the exhaust system for any leaks.
Will this increase gas energy consumption?
Indeed, less heat extraction will increase the flue gas temperature
Each case needs to be analyzed individually; theoretically, a decrease in air volume leads to a lower preheating temperature, which may reduce the efficiency of the heating furnace. If air takes a short circuit, the intake temperature can still be maintained; by controlling the negative pressure and oxygen content, there are not significant changes in the gas composition. However, a low exhaust temperature can lead to dew point corrosion. This is important