Effect of the temperature of the preheating air in the heating furnace
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What is the impact of the temperature of the preheating air in the heating furnace on oxygen content and the combustion process in the furnace? If the wind temperature is high, does the oxygen content in the furnace decrease?
My understanding is that hot air is introduced into the heating furnace primarily to save energy. The combustion process of the fuel in the heating furnace takes place in stages: the air required for combustion must first be heated to a certain temperature before combustion can occur. By using the waste heat recovery system of the heating furnace to heat the air, **wastage of thermal energy from the furnace’s exhaust gases is reduced, which also helps achieve energy savings. So as the temperature of the hot air rises, the combustion in the furnace improves, but the oxygen content is not necessarily the same. It’s just my personal opinion; I hope everyone can offer plenty of criticism and suggestions……
The level of oxygen content is closely related to the completeness of combustion in the furnace, as well as the opening degrees of the primary and secondary air valves. But if all the valves and dampers in the air supply line are opened, and given that the exhaust fan has limited capacity, then if the air supply temperature is high, the air supply volume will actually decrease; as a result, the oxygen content will drop in such cases!
The main purpose of the preheating temperature of the furnace air is to monitor changes in the effectiveness of the preheater； For the same furnace, the higher the preheating temperature, the more heat can be recovered, provided that the excess air coefficient remains within the appropriate range ； A higher preheating temperature facilitates combustion ； The furnace efficiency was improved through preheating ； The flue gas emission temperature directly reflects the efficiency of the furnace; it is important that the exhaust temperature be low and at least 20 degrees higher than the flue gas dew point temperature ； The oxygen content in the flue gas is an indicator used to assess the fuel combustion condition in the furnace and whether it is operating properly; it has little relation to the air preheating temperature