Regenerative melting furnace

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1. Thermal storage technology overview

With the progress of equipment and materials, regenerative heat exchange technology has been revolutionized and greatly improved. Currently in the metallurgical enterprises furnace and ladle roaster has been widely used. This paper introduces the application of heat storage technology in aluminum melting furnace, and illustrates the advantages of regenerative heat transfer technology in improving aluminum quality, speeding up aluminum speed, reducing pollutant emissions and reducing energy consumption. Regenerative heat exchange technology in the nonferrous metallurgy industry will also have broad application prospects.
2. Regenerative heat transfer technology

Regenerative burners arranged in pairs, the relative two burner as a group (A group, B group burner). Air from the blower at room temperature by the switching valve into the regenerative burner 1, 4, after passing through the regenerative burner 1,4 ceramic pellets heated in a very short period of time at room temperature air is heated to near Furnace temperature (usually 80-90% of furnace temperature). After the heated hot air enters the furnace, the flue gas in the surrounding furnace is entrained to form a lean, oxygen-rich and high-temperature lean air stream with an oxygen content substantially lower than 21%, and at the same time, fuel is injected into the vicinity of the lean high- State; at the same time, the hot flue gas in the furnace is discharged into the atmosphere through the other two regenerative burners 2 and 3, and the high-temperature hot flue gas in the furnace passes the regenerative burners 2 and 3 to store the sensible heat In the regenerators in the regenerative burners 2, 3, and then discharged at low temperature flue gas below 150 ° C through the reversing valve. When the heat storage body heat saturation to switch to commutation, regenerative burners in the heat exchange between working conditions, so as to achieve energy saving and reduce NOx emissions and so on.

Regenerative heat exchange technology has changed the traditional way of combustion, mainly manifested as fuel and air from the different channels into the furnace at an appropriate speed and mixed with the combustion products in the furnace, 21% of the air is diluted O2, the fuel in the furnace Under high temperature (above 1000 ℃) low oxygen concentration field (5 ~ 6.5%) under the conditions of combustion, this combustion has brought many advantages

(1) significant energy-saving effect, saving more than 30% of traditional smelting furnace hot mold network in China

As the regenerator “recovers” most of the residual heat in the flue gas and is brought back into the furnace by the media involved in the combustion, the heat cost of the furnace is greatly reduced, so that the regenerative heat transfer furnace is more efficient than the conventional melting furnace Energy saving.

(2) eliminate the local high temperature zone, uniform temperature distribution China hot spot mold network

The fuel burns under high temperature and low oxygen concentration conditions, forming a diffusion flame with no stable flame in the furnace, eliminating the localized high temperature zone caused by the stable flame; the flame is almost full of the furnace to make the furnace temperature more uniform. Regenerative burner frequent exchange of working conditions, the location of the flame and furnace gas flow frequently change direction, strengthen the furnace convection, reduce the furnace dead ends, but also to make the furnace temperature more uniform