Continuous horizontal-feeding preheating device and preheating enhancement method thereof

A horizontal continuous feeding preheating device, comprising a horizontal continuous feeding preheating duct and an electric arc furnace, and wherein the horizontal continuous feeding preheating duct is provided with a first dust removal port and a second dust removal port at an interval along the material conveying direction, the first dust removal port is located behind a sealed feed inlet of the horizontal continuous feeding preheating duct and close to the sealed feed inlet, the second dust removal port is located at a rear section of the horizontal continuous feeding preheating duct and close to the feed inlet of the electric arc furnace;

• the first dust removal port is connected with a mixed flue gas pipeline, and the second dust removal port is connected with a hot flue gas pipeline;
• the mixed flue gas pipeline and the hot flue gas pipeline are connected with the settling chamber by a flue gas adjusting distributor and a flue;
• a first preheating area is formed by the horizontal continuous feeding preheating duct between the two dust removal ports, and a second preheating area is formed by the horizontal continuous feeding preheating duct between the second dust removal port and the feed inlet of the electric arc furnace;
• duct height of the first preheating area of the horizontal continuous feeding preheating duct is less than that of the second preheating area;
• the device includes a plurality of burners I obliquely installed in the first preheating zone and a plurality of burners II obliquely installed in the second preheating zone, wherein horizontal components of direction of combustion air flow of each burner I and each burner II are opposite to material conveying direction;
• the first dust removal port is set to ensure a constant negative pressure P1, and the second dust removal port is set to ensure a constant negative pressure P2.