Relationship between the flue gas temperature of the heating furnace and season
Thread Content
Under unchanged operating conditions, what is the relationship between the flue gas temperature of the heater in summer and winter? Is it not easy to lower the exhaust gas temperature in summer, because the external air temperature is relatively high in summer while it is relatively low in winter? This results in higher exhaust gas temperatures in summer and lower ones in winter; under unchanged conditions, does this only occur due to seasonal changes? ? ?
Assuming all other conditions remain unchanged, of course the exhaust temperature is lower in winter, so heat dissipation is reduced.
Does keeping the operating conditions unchanged mean that the effective heat load remains constant? If that is the case, I think there shouldn’t be a large difference in the flue gas temperature between winter and summer. If waste heat from the flue gas is to be used to preheat the air entering the furnace, then the temperature of the flue gas after heat exchange will change significantly depending on the temperature of the outside air.
Controlling the flue gas temperature is primarily aimed at preventing dew point corrosion. During summer, when temperatures are high, the flue gas temperature can be set a bit lower; in winter, when temperatures are low, the temperature of the flue gas undergoing heat exchange with the air should be kept slightly higher, to prevent the flue gas temperature from dropping below the dew point temperature when in contact with cold air, thereby avoiding dew point corrosion.
There are now new types of preheaters that can reduce the flue gas temperature
Replace the low-temperature section with ceramic or glass material
The smoke exhaust temperature can be reduced to 110