CN-122015490-A - Arc furnace mouth structure of induction furnace and tapping method for shortening tapping stroke of arc furnace mouth structure

Abstract

The invention discloses an arc furnace mouth structure of an induction furnace and a tapping method for shortening a tapping stroke, and belongs to the technical field of metallurgical smelting equipment. The furnace mouth comprises a furnace mouth body, a furnace mouth lining, a furnace mouth front end flow guide part, an arc transition surface and a stable, low-resistance and low-temperature tapping, wherein the furnace mouth body is arranged at a tapping hole of an induction furnace, the furnace mouth lining is arranged at the middle part of the furnace mouth body and is used for forming a furnace mouth flow channel for flowing melt, the front end flow guide part of the furnace mouth is arranged at an outlet end of the furnace mouth body, the appearance of the flow guide part and an outlet transition section of the furnace mouth flow channel are arc transition surfaces, so that the melt forms a streamline of continuous curvature transition in the tapping direction, the front end of the furnace mouth is changed into an arc flow guide end from a traditional straight end surface structure, the melt forms a streamline of continuous curvature transition in the tapping process, the effective tapping stroke and the exposed length of the furnace mouth flow channel are shortened, and the heat dissipation and flow blocking risks of the melt in the tapping section are reduced, and therefore, the temperature drop, slag-hanging and nodulation and flow fluctuation are reduced, and stable, low-temperature tapping is realized. The structure is suitable for induction smelting scenes such as a vacuum induction furnace.

Inventors

• CAO GUOXIN
• LI MINGHONG
• HAO XIAN
• LI ZHIXING
• ZHANG JIANWEI
• XU WENLIANG
• HE YONGSHENG
• FU BAOQUAN

Assignees

• 西安聚能高温合金材料科技有限公司

Dates

Publication Date

20260512

Application Date

20260211

Claims (6)

1. 1. The arc furnace mouth structure of the induction furnace is characterized by comprising: the furnace mouth body (1) is arranged at the tapping hole position of the induction furnace; a furnace mouth lining (2) arranged in the middle of the furnace mouth body (1) and used for forming a furnace mouth runner for melt flow; a flow guiding part (3) arranged at the front end of the furnace mouth and positioned at the outlet end of the furnace mouth body (1); the appearance of the flow guiding part (3) and the outlet transition section of the furnace mouth runner are arc transition surfaces, so that a continuous curvature transition streamline is formed on the melt in the tapping direction, the effective stroke of a steel section is reduced, and the flow resistance and the temperature are reduced.
2. 2. The arc furnace mouth structure of the induction furnace, according to claim 1, is characterized in that the arc radius R of the arc transition surface is 30-200 mm.
3. 3. The arc furnace mouth structure of the induction furnace, as claimed in claim 1, is characterized in that a tapered section is arranged at the position of the furnace mouth lining (2) close to the steel tapping hole, and the taper angle alpha of the tapered section is 2-12 degrees.
4. 4. The arc furnace mouth structure of induction furnace according to claim 1, wherein the furnace mouth body (1) is made of high aluminum, magnesium, spinel, zirconium or composite refractory material thereof, and can be coated with an anti-wetting and/or anti-adhesion coating on the inner surface.
5. 5. The tapping method for shortening the tapping stroke of the arc-shaped furnace mouth structure of the induction furnace according to any one of claims 1 to 4, which is characterized by comprising the following steps: S1, preheating a furnace mouth, namely preheating a furnace mouth body to enable the furnace mouth body to reach a set temperature interval; S2, tapping is started, namely a tapping mechanism is started, and melt enters a furnace mouth runner; s3, arc diversion, namely continuously steering the melt through an arc transition surface and discharging the melt from a steel tapping hole, so that the effective stroke of an outlet section is shortened; S4, stabilizing tapping, namely minimizing the free fall and the exposed length of the melt by controlling the tapping angle, the tapping height and the receiving position.
6. 6. The tapping method for shortening the tapping stroke of the arc furnace mouth structure of the induction furnace according to claim 1, wherein in the step S4, the effective exposure stroke from the tapping hole to the receiving position is reduced by 10% -40% compared with that before transformation, so as to reduce the risks of temperature drop and blockage.

Description

Arc furnace mouth structure of induction furnace and tapping method for shortening tapping stroke of arc furnace mouth structure Technical Field The invention relates to the technical field of metallurgical smelting equipment and tapping technology, in particular to an arc furnace mouth structure of an induction furnace and a tapping method for shortening tapping stroke. Background Induction furnace tapping typically relies on a furnace mouth to direct the melt from the furnace body to a ladle, mold or launder system. The front end of the existing furnace mouth is mostly in a straight end face or broken line transition structure, and the following problems easily occur in actual production: (1) The tapping stroke is long, the exposed section is long, the time that the melt is exposed in the environment at the tapping end is longer, and the temperature drop is increased; (2) The temperature drop and the blocking are coupled, namely the temperature drop is increased to ensure that the viscosity of the melt rises and the nodulation is faster, the blocking is further aggravated, and a vicious circle is formed; (3) The maintenance cost is high, the cleaning of the end part of the furnace mouth is frequent, the service life is shortened, and the production beat and the quality stability are affected. Therefore, there is a need for a tap hole structural modification that can shorten the tapping stroke, reduce the temperature drop and reduce the risk of obstruction. Disclosure of Invention The invention aims to provide an arc furnace mouth structure of an induction furnace and a tapping method for shortening tapping stroke of the arc furnace mouth structure, wherein an arc transition surface is arranged at the front end of the furnace mouth, and a tapered section can be arranged at a tapping hole; the furnace mouth body is made of high aluminum, magnesium, spinel, zirconium or composite refractory materials thereof, and can be coated with an anti-wetting and/or anti-adhesion coating on the inner surface, and meanwhile, the furnace mouth preheating, tapping angle and tapping height control are matched, so that a continuous curvature transitional streamline is formed in the melt in the tapping process, the flow resistance and the temperature reduction are reduced, and the problems in the background technology are solved. In order to achieve the purpose, the invention provides the following technical scheme that the arc furnace mouth structure of the induction furnace comprises: the furnace mouth body is arranged at the tapping hole position of the induction furnace; A furnace mouth lining arranged in the middle of the furnace mouth body and used for forming a furnace mouth runner for melt flow; The flow guiding part at the front end of the furnace mouth is positioned at the outlet end of the furnace mouth body; the appearance of the flow guiding part and the outlet transition section of the furnace mouth runner are arc transition surfaces, so that a continuous curvature transition streamline is formed on the melt in the tapping direction, the effective travel of the steel section is reduced, and the flow resistance and the temperature are reduced. Preferably, the arc radius R of the arc transition surface is 30-200 mm. Preferably, a tapered section is arranged at the position, close to the tapping hole, of the furnace mouth lining, and the taper angle alpha of the tapered section is 2-12 degrees. Preferably, the furnace mouth body material is high alumina, magnesia, spinel, zirconia or a composite refractory material thereof, and can be coated with an anti-wetting and/or anti-adhesion coating on the inner surface. A tapping method for shortening tapping stroke of an arc furnace mouth structure of an induction furnace comprises the following steps: S1, preheating a furnace mouth, namely preheating a furnace mouth body to enable the furnace mouth body to reach a set temperature interval; S2, tapping is started, namely a tapping mechanism is started, and melt enters a furnace mouth runner; s3, arc diversion, namely continuously steering the melt through an arc transition surface and discharging the melt from a steel tapping hole, so that the effective stroke of an outlet section is shortened; S4, stabilizing tapping, namely minimizing the free fall and the exposed length of the melt by controlling the tapping angle, the tapping height and the receiving position. Preferably, in the step S4, the effective exposure travel from the tap hole to the receiving position is reduced by 10% -40% compared with that before transformation, so as to reduce the risks of temperature drop and blockage. Compared with the prior art, the invention has the beneficial effects that: (1) The stroke is shortened, namely, the effective exposed section of the tapping end is reduced by arc diversion, so that the exposed length of the melt is shorter; (2) The temperature drop is reduced, namely the exposed section is shortened, the flow is more stab