Electrode preheating device for direct-current submerged arc furnace

Abstract

The utility model belongs to the technical field of iron alloy direct current submerged arc furnace equipment, namely an electrode preheating device for a direct current submerged arc furnace. A preheating device is obliquely arranged at a pressing platform of an upper holding cylinder of the electrode and consists of an air inlet pipeline, an insulating part, an electric heater and a fan which are connected in sequence; an air inlet of the air inlet pipeline is obliquely mounted on the pressing platform; and a sealing device is arranged between the upper part of the holding cylinder and the electrode. A heater and a fan are combined to preheat an electrode, an air inlet pipeline is in 45-degree inclined connection and is tangent to a holding cylinder, and air enters the holding cylinder and an electrode cavity through an air pipe and is coiled downwards, so that the heating surface is more uniform. By preheating the electrode paste in advance, the electrode roasting effect is greatly improved, especially in winter in some severe cold areas, the electrode paste is in a frozen state when entering the furnace, the electrode paste is preheated in advance at the top of the electrode, a good foundation is laid for bottom roasting, and the hidden danger of production halt caused by poor roasting is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ferroalloy direct current ore smelting furnace equipment, that is, an electrode preheating device for direct current ore smelting furnace. BACKGROUND

[0002] The traditional ore smelting furnace is a three-phase alternating current furnace, and the three electrodes are A, B and C three items. In the production smelting, the three electrodes are consumed relatively uniformly. However, with the development of the times, the ferroalloy direct current ore smelting furnace gradually occupies the market, and the direct current electrode is mostly 4 electrodes or 6 electrodes. Each two groups of electrodes are a pair of positive and negative electrodes, which also leads to the fact that in the production smelting project, the current density of the positive electrode is large, the temperature is high, the electrode is oxidized fast, and the consumption speed is far more than that of the negative electrode. The fast consumption will lead to the fact that the electrode baking is not firm, the electrode is soft broken, and the production is stopped. INVENTION CONTENTS

[0003] The utility model aims at the above-mentioned insufficient and provides a kind of electrode preheating device for direct current ore smelting furnace, which has good preheating effect on electrode, reasonable structure and strong adjustability.

[0004] The technical solution of the utility model is: an electrode preheating device for direct current ore smelting furnace, a preheating device is obliquely arranged at the upper holding cylinder pressure release platform of electrode, and the preheating device is composed of sequentially connected air inlet pipeline, insulating part, electric heater and fan;The air inlet of air inlet pipeline is obliquely installed on the pressure release platform;Sealing device is installed between the electrode and the upper holding cylinder. Wind holes are opened along the periphery on a certain height of lower holding cylinder, and movable hoop baffle that can shield wind hole is arranged along the circumference of lower holding cylinder.

[0005] In the above scheme, it further includes:

[0006] The movable hoop baffle 8 is composed of two half circular arc plates, and the two ends are connected by flange bolts.

[0007] The distance between copper tile and wind hole is controlled between 2000mm-2500mm according to the size of furnace.

[0008] The utility model discloses a preheating device for electrode of direct current electric arc furnace, which is characterized by the following technical scheme: a preheating device is obliquely arranged on the electrode 1 at the upper holding cylinder pressing and placing platform, and the preheating device is composed of an air inlet pipe 7, an insulating part 4, an electric heater 5 and a fan 6 connected in sequence. The air inlet of the air inlet pipe 7 is obliquely installed on the pressing and placing platform, and the air inlet pipe 7 is obliquely welded at 45 degrees on the upper holding cylinder 3. The air inlet pipe is obliquely connected with the holding cylinder at an angle, the air inlet pipe is spirally downward, and the heated surface is more uniform. The air inlet is connected with the electric heater, the electric heater is connected with the fan, and reliable insulation is arranged between the equipment. A sealing device 2 is arranged between the upper holding cylinder 3 and the electrode 1, i.e. the top is sealed, so as to prevent the hot air from overflowing upward.

[0009] The embodiments of the utility model will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structural diagram of the utility model.

[0011] Figure 2 is Figure 1 a top view structural diagram. DETAILED DESCRIPTION

[0012] Referring to Figure 1 , 2 , the names of the parts are as follows: 1, electrode, 2, sealing device, 3, upper holding cylinder, 4, insulating part, 5, electric heater, 6, fan, 7, air inlet pipe, 8, movable hoop baffle, 9, lower holding cylinder, 10, copper tile, 11, air outlet hole.

[0013] Referring to Figure 1 , 2 , a preheating device for electrode of direct current electric arc furnace, which is characterized by the following technical scheme: a preheating device is obliquely arranged on the electrode 1 at the upper holding cylinder pressing and placing platform, and the preheating device is composed of an air inlet pipe 7, an insulating part 4, an electric heater 5 and a fan 6 connected in sequence. The air inlet of the air inlet pipe 7 is obliquely installed on the pressing and placing platform, and the air inlet pipe 7 is obliquely welded at 45 degrees on the upper holding cylinder 3. The air inlet pipe is obliquely connected with the holding cylinder at an angle, the air inlet pipe is spirally downward, and the heated surface is more uniform. The air inlet is connected with the electric heater, the electric heater is connected with the fan, and reliable insulation is arranged between the equipment. A sealing device 2 is arranged between the upper holding cylinder 3 and the electrode 1, i.e. the top is sealed, so as to prevent the hot air from overflowing upward. Figure 2 in which, α=45 degrees.

[0014] The air outlet 11 is provided with a movable clamping hoop baffle 8 capable of opening and closing the air outlet 11. The movable clamping hoop baffle 8 is composed of two semicircular plates, and the two ends are connected by flange bolts, and is fixed on the circumference of the lower holding cylinder 9 (like a waistband holding the lower holding cylinder 9), and the width of the movable clamping hoop baffle 8 is greater than that of the air outlet 11, so that the air outlet 11 can be completely covered after being lowered. After loosening the bolts, the movable clamping hoop baffle 8 can be moved up and down to block the air outlet 11, and after adjustment, the bolts are tightened to be fixed on the holding cylinder, so as to realize the adjustment of the exposed amount of the air outlet 11. The copper tile 10 is controlled at a distance L of 2000-2500 mm from the air outlet 11 according to the size of the furnace, that is, the hot air can be guided to be fully preheated downward, and the hot air can be controlled to reach the position, so as to avoid overblowing and cause the reverse effect of blowing cold. Figure 1 The left arrow shows that the movable clamping hoop baffle 8 is in the up-moving state (above the air outlet 11, and only the right half of the movable clamping hoop baffle 8 is drawn), and the air outlet 11 is completely opened; the right arrow shows that the movable clamping hoop baffle 8 is in the air outlet 11 (indicated by the dotted line), and partially blocks the air outlet 11 (only the left half of the movable clamping hoop baffle 8 is drawn).

[0015] The combination of the electric heater 5 and the fan 6 can realize various matching combination adjustment of air volume and heater heating capacity, and the working condition environment is adjusted flexibly, so as to reduce the operation difficulty. The top of the upper holding cylinder 3 is sealed to reduce heat loss. The movable clamping hoop is arranged at the air outlet to adjust the outlet air volume, so that the operation is more flexible. The air inlet pipe is inclined at an angle of 45° and is tangent to the upper holding cylinder 3, and the air enters the upper holding cylinder 3 from the air inlet pipe 7 and spirals downward, so that the heated surface is more uniform. Through the preheating of the electrode paste, the electrode baking effect is greatly improved, especially in some cold regions in winter, the electrode paste enters the furnace in a frozen state, and the electrode paste is preheated at the top of the electrode 1, which lays a good foundation for the bottom baking, and greatly reduces the hidden danger of production stop due to poor baking.

[0016] The above description is only a specific embodiment of the present application, and various examples do not limit the essential content of the present application.

Claims

1. An electrode preheating device for a DC submerged arc furnace, characterized in that... A preheating device is obliquely installed at the upper holding cylinder pressing platform of the electrode (1). The preheating device consists of an air inlet pipe (7), an insulating part (4), an electric heater (5), and a fan (6) connected in sequence. The air inlet of the air inlet pipe (7) is obliquely installed on the pressing platform. A sealing device (2) is installed between the upper holding cylinder (3) and the electrode (1). An air outlet (11) needs to be opened along the periphery of the lower holding cylinder (9) at a certain height. A movable clamp baffle (8) that can block the air outlet (11) is provided along the circumference of the lower holding cylinder (9).

2. The electrode preheating device for a DC submerged arc furnace according to claim 1, characterized in that... The movable clamp baffle (8) consists of two semi-circular arc plates, with both ends connected by flange bolts.

3. An electrode preheating device for a DC submerged arc furnace according to claim 1 or 2, characterized in that... The distance between the copper tile (10) and the air outlet (11) is controlled between 2000mm and 2500mm depending on the size of the furnace.

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