In the past ten years, due to energy shortages, energy conservation work has been further carried out. Various new types of energy-saving advanced furnaces are becoming more and more perfect, and the use of high-quality thermal insulation materials such as new refractory fibers has significantly reduced the heat loss of the kiln. The use of advanced combustion devices enhances combustion, reduces incomplete combustion, and the air-fuel ratio tends to be reasonable. However, technologies to reduce heat loss from flue gas and recover waste heat from flue gas are still not progressing well. In order to further improve the thermal efficiency of the heating furnace and achieve the purpose of energy saving and consumption reduction, recycling waste heat of flue gas is also an important energy-saving way.
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