A rotary distributor for the charge of a furnace for the production of large crystalline fused magnesite

Abstract

The application provides a kind of production large crystalline fused magnesite electric-arc furnace charge rotary distribution device, including annular distribution ring, concentric rotating support ring and annular support ring, the annular distribution ring is the ring type groove inside multiple grid material groove structure with exhaust hole, fixedly installed above concentric rotating support ring, connected with gear drive power device through the outer ring of annular gear, the concentric rotating support ring is supported and limited by annular support ring, and can rotate relative to annular support ring.The production large crystalline fused magnesite electric-arc furnace charge rotary distribution device provided by the application realizes the rotary distribution of electric-arc furnace, the charge is transported into annular material groove through feeding pipe, and the charge is uniformly distributed in the periphery of furnace cylinder by uniform rotation of distributor.By controlling the unloading rhythm, controlling the unloading amount and the thickness of charge layer in the furnace, the production safety and personal injury accidents such as furnace spraying and splashing are effectively avoided.

Description

Technical Field

[0001] This invention relates to a production equipment for large-crystallized fused magnesia, and more particularly to a furnace charge rotating and distributing device for a submerged arc furnace for producing large-crystallized fused magnesia. Background Technology

[0002] Large-crystal fused magnesia is mainly produced by melting lightly calcined magnesia powder in a submerged arc furnace. It has many advantages such as high purity, large crystal grains, dense structure, strong slag resistance, and good thermal shock stability. It is an important raw material for the production of high-grade magnesia bricks, magnesia-carbon bricks, and unshaped refractories.

[0003] Currently, electric arc furnaces mainly consist of a furnace cylinder, graphite electrodes, and a railcar. The furnace cylinder is typically a cylindrical structure with a diameter of 1.3–2.0 m and a height of 4–6 m, welded from rolled steel plates with a thickness of 5–8 mm. The furnace cylinder is placed on the railcar, and three graphite electrodes extend into it through the upper opening. The material is distributed manually using a shovel or via a high-level hopper chute. The charge is poured from one or two points on the upper part of the furnace cylinder to the bottom, and an electric current is introduced through the graphite electrodes to heat and melt the charge between the electrodes.

[0004] During production, as the furnace charge is continuously added, the electrical control system automatically raises the electrodes until the molten charge fills the furnace cylinder, completing one smelting cycle. After smelting, the graphite electrodes are completely removed, and the furnace cylinder is pushed into the plant for natural cooling via a railcar. Typically, the furnace cylinder is replaced after each furnace cycle, while the graphite electrodes and railcars can be reused.

[0005] The drawbacks of existing technologies include: In the manual shoveling and feeding method, the furnace charge is first transported to an operating platform above the furnace cylinder. Workers then use shovels and other tools to shovel the charge into the furnace cylinder, from where it falls through the top opening to the bottom. This method involves extremely strenuous labor. Furthermore, during the continuous smelting process in the submerged arc furnace, the operating platform reaches extremely high temperatures, and the dust ejected upwards from the furnace cylinder during shoveling causes severe pollution, seriously harming workers' health. Additionally, high-pressure gas ejection from the furnace charge frequently causes furnace blowouts and splashes, seriously threatening worker safety. Moreover, this method suffers from uneven charge distribution.

[0006] In the high-level hopper chute charging method, the furnace charge is slid into the furnace drum using a chute. While the charging direction can be manually adjusted during the charging process, uneven charge distribution still exists. During charging, the charge accumulates in one or a few fixed locations. As the charge spreads, most of it is distributed at the bottom of the furnace, but a peak remains directly below the charging point. This results in uneven distribution of the charge at the bottom of the submerged arc furnace. In the electrofusion smelting process, the melting of the charge generates a large amount of gas. Uneven charge distribution, excessively thick charge layers, or poor permeability of the charge layer can all cause gas accumulation in the smelting area within the charge, leading to increased gas pressure and potentially causing production accidents such as furnace blowouts and splashing, as well as personal safety incidents.

[0007] In summary, the challenges are: 1. How to operate around the top opening of the furnace cylinder; 2. How to ensure the smooth exhaust of airflow from the furnace cylinder; 3. How to prevent dust from escaping from the furnace cylinder and clogging the feed inlet; 4. How to maintain a distance from the top opening of the furnace cylinder to prevent the effects of high temperatures. Summary of the Invention

[0008] This invention provides a rotating charge distribution device for a molten magnesia furnace producing large crystals, solving the aforementioned problems. It achieves uniform peripheral charge distribution during furnace filling, improving smelting efficiency and preventing safety accidents such as furnace splashing and blowouts caused by high-pressure gas ejection from the furnace. The technical solution is as follows:

[0009] A rotating charge distribution device for a furnace producing large-crystallization fused magnesia submerged arc furnace includes an annular charge distribution ring, a concentric rotating support ring, and an annular support ring. The annular charge distribution ring is fixedly installed above the concentric rotating support ring and is connected to a gear drive power device through an annular gear on its outer ring. The concentric rotating support ring is supported and limited by the annular support ring and can rotate relative to the annular support ring.

[0010] The annular fabric ring includes an inner ring, an outer ring, and a fabric groove between them. The fabric groove is divided into several compartments of the same shape and size, with the same orientation. Adjacent compartments are separated by dividing plates.

[0011] The material trough includes a sloping bottom plate and an exhaust hole. The sloping bottom plate has an inclination and is connected to annular vertical plates on both sides. The top is connected to a partition vertical plate, and a material discharge gap is formed between the bottom and the partition vertical plate of the previous compartment. A tubular exhaust hole is provided at the connection between the top of the sloping bottom plate and the partition vertical plate.

[0012] The concentric rotating support ring includes an annular rotating platform, a vertical plate ring, a support cam group, and a limiting cam group. The vertical plate ring has a double-layer vertical plate annular seam structure, forming an annular gap through the double-layer vertical plates. The upper part of the vertical plate ring is closed by a horizontal annular rotating platform, which is supported by an annularly distributed support cam group. The outer side of the vertical plate ring is limited by an annularly distributed limiting cam group. The support cam group and the limiting cam group are fixedly installed on the annular support ring.

[0013] The support cam group includes several support cams, and the limiting cam group includes several limiting cams. The support cams and limiting cams are arranged sequentially on the annular support ring and are evenly distributed on their respective circumferences.

[0014] The annular support ring includes a conical cylinder, an upper annular plate, an upper support plate, a reinforcing rib plate, and a lower support plate. The conical cylinder is wider at the top and narrower at the bottom, with a circular upper annular plate at the top and a circular lower annular plate at the bottom. An upper support plate extending horizontally outward is provided at the connection between the conical cylinder and the upper annular plate, and a lower support plate extending horizontally outward is provided at the connection between the conical cylinder and the lower annular plate. A reinforcing rib plate is provided on the outer wall of the conical cylinder, with its upper end fixedly connected to the upper support plate and its lower end fixedly connected to the lower support plate.

[0015] The upper annular plate is inserted into the annular gap of the concentric rotating support ring upright plate ring, and the upper annular plate does not rub against the upright plate ring.

[0016] The distance between the two sides of the upper annular plate and the annular gap of the vertical plate is 5-15mm, and the height is more than 3mm less than the annular gap.

[0017] The annular support ring is placed on the operating platform, directly opposite the upper opening of the furnace cylinder.

[0018] The annular fabric ring and the concentric rotating support ring are fixed by slots or bolts.

[0019] The present invention provides a rotating charge distribution device for a submerged arc furnace producing large-crystallized fused magnesia. This device enables rotating charge distribution within the furnace, conveying the charge through a feed pipe into an annular trough. The charge is then evenly distributed around the furnace drum by the rotating charge distribution machine. By controlling the charging rhythm, the amount of charge, and the thickness of the charge layer within the furnace, production safety and personal injury accidents such as furnace splashing and spillage are effectively avoided. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the furnace charge rotating and distributing device of the aforementioned large-crystallization fused magnesia submerged arc furnace;

[0021] Figure 2This is an exploded structural diagram of the furnace charge rotating distribution device of the aforementioned large-crystallization fused magnesia submerged arc furnace;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the furnace charge rotating distribution device of the large crystallizing fused magnesia submerged arc furnace;

[0023] Figure 4 This is a schematic diagram of the working operation of the furnace charge rotating distribution device of the large crystallizing fused magnesia submerged arc furnace;

[0024] The labels in the diagram are as follows:

[0025] 1-Annular fabric ring; 2-Concentric rotating support ring; 3-Annular support ring; 4-Feed pipe; 11-Fabric trough; 12-Annular gear; 13-Exhaust hole; 14-Sloping bottom plate; 15-Clamping foot; 21-Clamping groove; 22-Annular rotary table; 23-Support cam; 24-Limiting cam; 31-Upper annular plate; 32-Upper support plate; 33-Reinforcing rib plate; 34-Lower support plate. Detailed Implementation

[0026] like Figures 1 to 3 As shown, the furnace charge rotating and distributing device for the large-crystallization fused magnesia submerged arc furnace includes an annular distributing ring 1, a concentric rotating support ring 2, and an annular support ring 3. The annular distributing ring 1 is fixedly installed above the concentric rotating support ring 2. The concentric rotating support ring 2 is supported and limited by the annular support ring 3 and can rotate on the annular support ring 3. The annular support ring 3 is placed on the operating platform, directly opposite the upper opening of the furnace cylinder.

[0027] The annular fabric ring 1 is a multi-compartment material trough structure with an annular groove, which includes an inner ring, an outer ring and a fabric trough 11. The inner ring and the outer ring form an annular upright plate. The fabric trough 11 is sandwiched between the inner ring and the outer ring. The fabric trough 11 is divided into several compartments of the same shape and size. The compartments are oriented in the same direction, and are arranged clockwise or counterclockwise. The compartments of adjacent compartments are separated by dividing upright plates.

[0028] Combination Figure 4 As shown, the material trough includes a sloping bottom plate 14 and an exhaust port 13. The sloping bottom plate 14 has an incline, is connected to annular vertical plates on both sides, is connected to a dividing vertical plate on the top, and forms a material discharge gap between the bottom and the dividing vertical plate of the previous compartment. A tubular exhaust port 13 is provided at the connection between the top of the sloping bottom plate 14 and the dividing vertical plate, and the exhaust port 13 is located on one side of the inner ring. The function of the exhaust port 13 is to discharge the gas inside the furnace cylinder to prevent the gas from pushing the material upward from the material discharge gap at the bottom of the material distribution trough 11 and obstructing the material discharge.

[0029] The annular fabric ring 1 has an annular gear 12 fitted around its outer circumference. Furthermore, the annular gear 12 is fitted in the middle of the outer ring of the annular fabric ring 1. The annular gear 12 is connected to an external gear drive power device, which controls the rotation of the annular gear 12.

[0030] The annular fabric ring 1 and the concentric rotating support ring 2 below it are fixed relative to each other. The fixing method can be a slot or bolt for easy disassembly. In one embodiment, the lower part of the outer ring of the annular fabric ring 1 is provided with a locking foot 15, and the concentric rotating support ring 2 is provided with a locking groove 21. The locking foot 15 and the locking groove 21 cooperate to lock the locking foot 15 into the locking groove 21, thereby completing the fixed connection between the annular fabric ring 1 and the concentric rotating support ring 2.

[0031] The concentric rotating support ring 2 includes an annular rotating platform 22, a vertical plate ring, a support cam group, and a limit cam group.

[0032] The annular rotating platform 22 is fixedly connected to the vertical plate ring. Its upper surface is provided with a slot 21 for fixing the annular fabric ring 1. The lower inner side is fixedly connected to the vertical plate ring, and the lower outer side is provided with a support cam group and a limit cam group. The support cam group and the limit cam group are installed on the annular support ring 3.

[0033] The upright plate ring is a double-layer upright plate ring seam structure. The double-layer upright plates form an annular gap, and the upper part is closed by a horizontal annular rotating platform 22. The annular rotating platform 22 is supported by annularly distributed support cam group, and the outer side of the upright plate ring is limited by annularly distributed limiting cam group, ensuring that the concentric rotating support ring 2 is always concentric with the central axis of the annular support ring 3 when rotating.

[0034] The supporting cam assembly includes several supporting cams 23, and the limiting cam assembly includes several limiting cams 24. The bottoms of the supporting cams 23 and limiting cams 24 are fixedly mounted on the upper supporting plate 32 of the annular supporting ring 3. To ensure uniform force distribution on the supporting and limiting cams, the supporting cams 23 and limiting cams 24 are arranged alternately and evenly on their respective circumferences. Thus, considering the size of the supporting cams 23 and limiting cams 24, the supporting cams 23 are evenly distributed on one circumference, and the limiting cams 24 are evenly distributed on another circumference. If the size design allows, the two circumferences can also overlap, so that the supporting cams 23 and limiting cams 24 are evenly distributed on the same circumference.

[0035] In use, the ring-shaped rotating platform 22 is supported by the support cam group, and the vertical plate ring is limited by the limiting cam group, so that the concentric rotating support ring 2 can always rotate around the central axis (perpendicular to the ground) of the ring-shaped support ring 3 below it, so that the concentric rotating support ring 2 and the ring-shaped support ring 3 rotate relative to each other.

[0036] The annular support ring 3 includes a conical cylinder, an upper annular plate 31, an upper support plate 32, a reinforcing rib plate 33, and a lower support plate 34.

[0037] The conical cylinder is wider at the top and narrower at the bottom. It has a circular upper annular plate 31 at the top and a circular lower annular plate at the bottom. An upper support plate 32 extending horizontally outward is provided at the connection between the conical cylinder and the upper annular plate 31, and a lower support plate 34 extending horizontally outward is provided at the connection between the conical cylinder and the lower annular plate. A reinforcing rib plate 33 is provided on the outer wall of the conical cylinder. The upper end of the reinforcing rib plate 33 is fixedly connected to the upper support plate 32, and the lower end is fixedly connected to the lower support plate 34.

[0038] The upper annular plate 31 engages with the vertical plate ring of the concentric rotating support ring 2, inserting the upper annular plate 31 into the annular gap of the vertical plate ring. In this way, the annular gap of the vertical plate ring engages with the upper annular plate 41 of the annular support ring 3, acting as a seal to prevent dust from overflowing and affecting the lubrication of the support cam assembly and the limiting cam assembly. The width of the annular gap is designed to avoid friction with the upper annular plate 31, and the distance (gap) between the annular gap and the inner and outer surfaces of the upper annular plate 31 is 5–15 mm. The height of the annular gap is 50–300 mm, and the insertion depth of the upper annular plate 31 is at least 3 mm less than the height of the annular gap, allowing the concentric rotating support ring 2 and the annular support ring 3 to rotate freely and avoid friction.

[0039] The upper support plate 32 is used to fix and install the support cam 23 and the limiting cam 24. The lower support plate 34 is placed on the operating platform so that the lower opening of the annular support ring 3 is directly opposite the upper opening of the furnace cylinder. The lower edge annular plate is used to lock into the opening of the operating platform and limit the annular support ring 3.

[0040] like Figure 4 As shown, when the rotating charging device of the large-crystallization electrofused magnesia submerged arc furnace is in operation, two feed pipes 4 are set above the annular charging ring 1. As the annular charging ring 1 rotates, the material supplied by the feed pipes 4 falls onto the charging trough 11, flows down from the sloping bottom plate 14 through the annular support ring 3 into the periphery of the furnace cylinder. By controlling the rotation speed of the annular charging ring 1 and the size of the material discharge gap in the charging trough 11, the electrofusion smelting can proceed smoothly.

[0041] When the furnace drum and graphite electrodes of the electric arc furnace are installed and the furnace is started, the motor of the external gear drive power unit is activated, which drives the gear connected to the motor to push the ring gear 12, causing the annular feeding ring 1 to rotate. The upper feeding pipe 4 begins to transport the furnace charge, which is evenly sprinkled onto the annular feeding ring 1. As the annular feeding ring 1 rotates, the furnace charge falls evenly into the furnace drum from the lower openings of the small material troughs.

[0042] A dust removal device can be installed outside the rotating charge distribution device, so that the exhaust port 13 can facilitate the overall dust removal.

[0043] In one embodiment of the charge rotating distribution device for a large-crystallization fused magnesia submerged arc furnace: the outer diameter of the annular distribution ring 1 is 1600 mm, the inner diameter is 1400 mm, and the height is 300 mm. The distribution trough 11 is divided into 16 evenly distributed small compartments, each compartment having a bottom plate slope of 30° and a bottom gap width of 10 mm. The cylindrical exhaust hole 13 has a diameter of 40 mm and a height of 30 mm. The ring gear 12 has a module of 2 and 120 teeth. The support cam 23 and the limiting cam 24 are both self-made support rollers with a diameter of 150 mm and made of wear-resistant cast iron.

[0044] The present invention provides a rotating charge distribution device for a submerged arc furnace producing large-crystallized fused magnesia. This device enables rotating charge distribution within the furnace, conveying the charge through a feed pipe into an annular trough. The charge is then evenly distributed around the furnace drum by the rotating charge distribution machine. By controlling the charging rhythm, the amount of charge, and the thickness of the charge layer within the furnace, production safety and personal injury accidents such as furnace splashing and spillage are effectively avoided.

Claims

1. A rotating charge distribution device for a furnace used in the production of large-crystallization fused magnesia, characterized in that: It includes an annular fabric ring, a concentric rotating support ring, and an annular support ring. The annular fabric ring is fixedly installed above the concentric rotating support ring and is connected to a gear drive power device through an annular gear on its outer ring. The concentric rotating support ring is supported and limited by the annular support ring and can rotate relative to the annular support ring. The annular support ring includes a conical cylinder, an upper annular plate, an upper support plate, a reinforcing rib plate, and a lower support plate. The conical cylinder is wider at the top and narrower at the bottom, with a circular upper annular plate at the top and a circular lower annular plate at the bottom. An upper support plate extending horizontally outward is provided at the connection between the conical cylinder and the upper annular plate, and a lower support plate extending horizontally outward is provided at the connection between the conical cylinder and the lower annular plate. A reinforcing rib plate is provided on the outer wall of the conical cylinder, with its upper end fixedly connected to the upper support plate and its lower end fixedly connected to the lower support plate. The annular support ring is placed on an operating platform, directly opposite the upper opening of the furnace cylinder. The concentric rotating support ring includes an annular rotating platform, a vertical plate ring, a support cam group, and a limiting cam group. The vertical plate ring has a double-layer vertical plate annular seam structure, forming an annular gap through the double-layer vertical plates. The upper part of the vertical plate ring is closed by a horizontal annular rotating platform, which is supported by an annularly distributed support cam group. The outer side of the vertical plate ring is limited by an annularly distributed limiting cam group. The support cam group and the limiting cam group are fixedly installed on the annular support ring. The annular fabric ring includes an inner ring, an outer ring, and a fabric groove between them. The fabric groove is divided into several compartments of the same shape and size, with the same orientation. Adjacent compartments are separated by partition plates. The fabric groove includes a sloping bottom plate and vent holes. The sloping bottom plate has an incline, is connected to the annular plate on both sides, is connected to the partition plates on the top, and forms a material feeding gap between the bottom and the partition plate of the previous compartment. A tubular vent hole is provided at the connection between the top of the sloping bottom plate and the partition plate. The supporting cam group includes several supporting cams, and the limiting cam group includes several limiting cams. The supporting cams and limiting cams are arranged sequentially on the annular support ring and are evenly arranged on their respective circumferences. A dust removal device is installed outside the furnace charge rotating and distributing device.

2. The furnace charge rotating and distributing device for a large-crystallization fused magnesia submerged arc furnace according to claim 1, characterized in that: The upper annular plate is inserted into the annular gap of the concentric rotating support ring upright plate ring, and the upper annular plate does not rub against the upright plate ring.

3. The furnace charge rotating and distributing device for a large-crystallization fused magnesia submerged arc furnace according to claim 1, characterized in that: The distance between the two sides of the upper annular plate and the annular gap of the vertical plate is 5~15mm, and the height is more than 3mm less than the annular gap.

4. The furnace charge rotating and distributing device for a large-crystallization fused magnesia submerged arc furnace according to claim 1, characterized in that: The annular fabric ring and the concentric rotating support ring are fixed by slots or bolts.

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