Efficient preheating vertical type steel scrap continuous feeding electric arc furnace

Abstract

The utility model discloses an efficient preheating vertical steel scrap continuous charging electric arc furnace, which comprises an electric arc furnace body and a steel scrap preheating bin arranged above the electric arc furnace body, the steel scrap preheating bin comprises a bin body, the top of the bin body is closed, the bottom of the bin body is provided with an opening communicated with the electric arc furnace body, and one side of the upper part of the bin body is provided with a steel scrap inlet; a vertically-arranged spiral conveying heat conduction plate is arranged in the bin body, a hollow rotating shaft is arranged in the center of the spiral conveying heat conduction plate, a hot air channel is arranged in the hollow part of the rotating shaft, a hot air inlet is formed in the bottom end of the rotating shaft, and the top end of the rotating shaft is installed on the top of the scrap steel preheating bin through a bearing. The side wall of the rotating shaft is provided with a plurality of vent holes used for communicating the hot air channel and the spiral conveying heat-conducting plate. The waste steel preheating bin is arranged, heat is fully reserved, the spiral conveying heat conduction plate is arranged, waste steel is directly heated, the preheating effect is good, and the preheating cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of plug scrap steel continuous charging electric arc furnace, in particular to a kind of high-efficiency preheating vertical scrap steel continuous charging electric arc furnace. BACKGROUND

[0002] During the electric arc furnace smelting process of scrap steel, if directly added, the main activity of initial smelting will be temperature rising and cost will be increased due to low temperature of scrap steel. The commonly used method at present is flue gas preheating, such as the high-efficiency preheating vertical scrap steel continuous charging electric arc furnace with application number 202021385288.6, but the preheating effect achieved by the technology is limited by the temperature of flue gas, and heat is partially lost in the preheating channel. Therefore, it is difficult to achieve good preheating effect. SUMMARY

[0003] The utility model solves the technical problems of prior art, and provides a vertical scrap steel continuous charging electric arc furnace with reasonable design, convenient use and good preheating effect.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A kind of high-efficiency preheating vertical scrap steel continuous charging electric arc furnace, characterized by comprising electric arc furnace body and scrap steel preheating bin arranged above electric arc furnace body, scrap steel preheating bin includes bin body, bin body top is closed, bin body bottom is provided with opening communicated with electric arc furnace body, bin body upper portion one side is provided with scrap steel inlet, bin body is provided with vertically arranged spiral conveying heat guide plate, spiral conveying heat guide plate center is provided with hollow rotating shaft, rotating shaft top end is installed in scrap steel preheating bin top through bearing, the hollow portion of rotating shaft is arranged as hot gas channel, the bottom end of rotating shaft is provided with hot gas inlet, rotating shaft side wall is provided with a plurality of air holes for connecting hot gas channel and spiral conveying heat guide plate, motor for driving rotating shaft and spiral conveying heat guide plate is installed on the bin body top.

[0006] The technical problems solved by the utility model can also be realized by the following technical scheme: a horizontal scrap steel conveying mechanism is connected to the scrap steel inlet.

[0007] The technical problems solved by the utility model can also be realized by the following technical scheme: the scrap steel preheating bin includes an outer cylinder, a brick layer arranged in the outer cylinder, and a thermal insulation layer arranged between the brick layer and the outer cylinder.

[0008] The technical problems solved by the utility model can also be realized by the following technical scheme: the rotating shaft is a heat conducting pipe shaft.

[0009] Compared with the prior art, the utility model discloses a waste steel preheating bin is equipped, and the ascending direction of flue gas is identical, and the heat in the smelting process is closed in the bin body, and the heat is fully reserved, and the heat loss is avoided, and the spiral conveying heat conduction plate is equipped, and is fully contacted with the waste steel, and the good heat conductivity of the spiral conveying heat conduction plate is utilized, and the waste steel is preheated in conveying, and the waste steel is continuously preheated in the conveying process, and the preheating effect is good, and the heat gas passage and the air hole are equipped, and the heat is evenly dispersed to the waste steel preheating bin, and the preheating effect is good, and the preheating cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structure diagram of the waste steel continuous charging electric arc furnace of the utility model.

[0011] In the drawing: 1 - electric arc furnace body, 2 - waste steel preheating bin, 3 - spiral conveying heat conduction plate, 4 - waste steel conveying mechanism, 5 - rotating shaft, 6 - air hole. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0013] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as a limitation on the utility model.

[0014] REFERENCE Figure 1The utility model relates to a vertical scrap steel continuous feeding electric arc furnace of high -efficient preheating, including electric arc furnace body 1 and scrap steel preheating bin 2 set at electric arc furnace body 1 upper, scrap steel preheating bin 2 includes bin body, bin body top is closed arrangement, bin body bottom is equipped with with electric arc furnace body open, bin body upper portion one side is equipped with scrap steel inlet, bin body is equipped with vertically arranged spiral conveying heat conducting plate 3, the centre of spiral conveying heat conducting plate 3 is equipped with hollow rotating shaft 5, the hollow portion of rotating shaft 5 is arranged as hot gas passage, the bottom end of rotating shaft 5 is equipped with hot gas inlet, and the top end of rotating shaft 5 is installed in scrap steel preheating bin 2 top through bearing, and a plurality of air holes 6 for interconnecting hot gas passage and spiral conveying heat conducting plate are arranged on the side wall of rotating shaft 5, and the rotating shaft 5 is a heat pipe shaft, and the above-mentioned heat pipe shaft, spiral conveying heat conducting plate are made of material that is both high-temperature resistant and has high thermal conductivity, and a motor for driving the rotating shaft and the spiral conveying heat conducting plate is installed on the top of the bin body.

[0015] A horizontally arranged scrap steel conveying mechanism 4 is connected to the scrap steel inlet, and the conveying mechanism can adopt any conveying mechanism disclosed in the prior art or commercially available, such as a belt conveying mechanism, a chain conveying mechanism, a conveying roller mechanism, etc.

[0016] The scrap steel preheating bin 2 includes an outer cylinder, a brick layer arranged in the outer cylinder, and a heat preservation and insulation layer arranged between the brick layer and the outer cylinder, thereby maximizing the retention of heat during the electric arc furnace smelting process.

[0017] The installation process of the vertical scrap steel continuous feeding electric arc furnace of high -efficient preheating is as follows: during the electric arc furnace smelting process, the hot gas generated by smelting rises upward, enters the scrap steel preheating bin 2 through the opening at the bottom of the scrap steel preheating bin 2, heats the spiral conveying heat conducting plate 3, starts the motor, and makes the spiral conveying heat conducting plate 3 rotate, while mixing the high-temperature gas at the lower part with the low-temperature gas at the upper part, so that the spiral conveying heat conducting plate 3 is uniformly heated. When the scrap steel is input, the scrap steel directly contacts the spiral conveying heat conducting plate 3, and the scrap steel is not only heated by the flue gas but also heated by the spiral conveying heat conducting plate 3, thereby improving the preheating speed of the scrap steel and ensuring the preheating effect.

[0018] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A high efficiency preheated vertical scrap continuous charging electric arc furnace characterized in that, The electric arc furnace body and the scrap steel preheating bin arranged above the electric arc furnace body, the scrap steel preheating bin comprises a bin body, the top of the bin body is closed, the bottom of the bin body is provided with an opening communicated with the electric arc furnace body, one side of the upper part of the bin body is provided with a scrap steel inlet, a vertically arranged spiral conveying heat guide plate is arranged in the bin body, a hollow rotating shaft is arranged in the center of the spiral conveying heat guide plate, the top end of the rotating shaft is installed on the top of the scrap steel preheating bin through a bearing, the hollow part of the rotating shaft is arranged as a hot gas channel, the bottom end of the rotating shaft is provided with a hot gas inlet, a plurality of air holes for connecting the hot gas channel and the spiral conveying heat guide plate are arranged on the side wall of the rotating shaft, and a motor for driving the rotating shaft and the spiral conveying heat guide plate is installed on the top of the bin body.

2. A high efficiency preheated vertical scrap continuous charging electric arc furnace as claimed in claim 1, wherein, A horizontally arranged scrap steel conveying mechanism is connected to the scrap steel inlet.

3. A high efficiency preheated vertical scrapfed electric arc furnace as claimed in claim 1 wherein, The scrap steel preheating bin comprises an outer cylinder, a brick layer arranged in the outer cylinder, and a heat preservation and insulation layer arranged between the brick layer and the outer cylinder.

4. A high efficiency preheated vertical scrapfed electric arc furnace as claimed in claim 1 wherein, The rotating shaft is a heat conducting pipe shaft.

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