Feeder device utilized in electric arc furnace, and flue gas and temperature control method
A sealed feeder device utilized in an electric arc furnace ( 1 ), and a flue gas and temperature control method. The sealed feeder device comprises a sealed feeding chute ( 5 ) having an outlet sealedly communicating with a side wall of the electric arc furnace ( 1 ), and a material blocking sealed arc-shaped door ( 3 ) disposed in the sealed feeding chute ( 5 ). The material blocking sealed arc-shaped door ( 3 ) separates the sealed feeding chute ( 5 ) into a cold steel scrap storage chamber ( 18 ) and a material feeding and dedusting chamber ( 2 ), and is operated by a driving mechanism ( 34 ) to separate or connect the cold steel scrap storage chamber ( 18 ) and the material feeding and dedusting chamber ( 2 ). The method comprises: adopting the feeder device to divide the flue gas of the electric arc furnace ( 1 ) into two paths, and controlling, by a flue gas adjustment device ( 16 ), a ratio of a flue gas flow from a flow-splitting dust removal pipe ( 11 ) to that from a dust removal pipe ( 4 ) to obtain a required flue gas mixture temperature.
1. A sealed feeder device utilized in an electric arc furnace, comprising a sealed feeding chute having an outlet sealedly communicating with a side wall of the electric arc furnace and a material blocking sealed door disposed in the sealed feeding chute; the material blocking sealed door separates the sealed feeding chute into a cold steel scrap storage chamber and a material feeding and dedusting chamber, and is operated by a driving mechanism to separate or connect the cold steel scrap storage chamber and the material feeding and dedusting chamber; a strip replaceable liner plate is disposed in blanking point area of the sealed feeding chute; the material blocking sealed door is a planar straight panel or an arc-shaped panel, wherein the panel has a flue gas sealing edge on a periphery of the panel; the material blocking sealed door is an arc-swing material blocking sealed door constrained by swing arms which form a portal frame structure; one end of each swing arm is fixed together with the panel, and the other end is rotatably fixed together with the sealed feeding chute through a rotating shaft; a vibration exciter for forced vibration feeding is disposed in the cold steel scrap storage chamber; connection between the material feeding and dedusting chamber and the side wall of the electric arc furnace is provided with a telescopic chute and a telescopic chute driving device; an inclination angle of the sealed feeding chute relative to the horizontal plane is 30-60°.
2. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the panel has tooth structures.
3. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the telescopic chute is composed of an inclined section integrated with the wall of the electric arc furnace and a telescopic section fixed on the telescopic chute driving device.
4. The sealed feeder device utilized in an electric arc furnace according to claim 3 , wherein the telescopic chute driving device is a guide cart or an oil cylinder or an air cylinder or an electric push rod.
5. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the sealed feeder device further comprises a mobile cart which is provided with a fixing frame, and the sealed feeding chute is fixed on the fixing frame.
6. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the steel scrap storage chamber and the material feeding and dedusting chamber have an inwardly dished arc-shaped bottom.
7. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the material feeding and dedusting chamber and the steel scrap storage chamber are connected through a flue, and the degree of opening and closing of two dust removal pipes are controlled by valves.
8. The sealed feeder device utilized in an electric arc furnace according to claim 1 , wherein the material feeding and dedusting chamber and the steel scrap storage chamber converge through a flue to a three-way connecting structure which can adjust flue gas flows.
9. The sealed feeder device utilized in an electric arc furnace according to claim 8 , wherein the three-way structure is provided with a swing valve plate, the swing valve plate is confined in middle part of the outlets of the material feeding and dedusting chamber and the steel scrap storage chamber and the inlet of the other passage of the three-way structure to control or close the flue gas flows of the material feeding and dedusting chamber and the steel scrap storage chamber.