Introduction to the principles and practical effects of enhanced heat transfer and energy-saving technologies in the technical renovation of tubular heating furnaces

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This is achieved by installing thermal radiation elements on the inner wall of the furnace, which not only significantly increases the thermal radiation area of the inner wall but also raises its emissivity coefficient. Put simply, it means changing from burning only the smooth furnace walls to burning the radiation elements as well as the furnace walls. According to Kirchhoff’s law: a good absorber is also a good radiator. After the modification, the heat absorption capacity of the furnace wall increases, and consequently the amount of heat it radiates to the furnace tubes also increases. In other words, when the temperature of the furnace chamber remains the same, the temperature of the modified furnace tubes will increase. Therefore, after the technical upgrades, if the temperature requirement for the furnace tubes remains unchanged, there is no need to adjust the temperature of the furnace chamber (it can generally be reduced by 30°C to 50°C). As the temperature of the furnace chamber decreases, the amount of fuel required also decreases, thereby achieving energy savings (the fuel savings range from 4% to 18%). In practical applications in the refining industry, economic benefits of several million to tens of millions of yuan in annual fuel cost savings can be achieved.