Plasma sintering ignition furnace and system thereof

Abstract

The utility model provides a plasma sintering ignition furnace and a system thereof. The plasma sintering ignition furnace comprises a door type frame, plasma torches and a refractory material frame, the door type frame comprises side frames located on the two sides and a top frame connected with the top ends of the two side frames, the refractory material frame is erected below the top frame, and the multiple plasma torches are arranged in the length direction of the top frame. The plasma torch penetrates through the top frame and the refractory material frame, and the bottom end of the plasma torch extends out of the lower portion of the refractory material frame to ignite sintered ore. According to the plasma sintering ignition furnace, traditional coal gas is not needed, only clean energy electricity and cooling water are used as energy media, pollution emission caused by the coal gas is avoided, and the structure is simple; in addition, the stable and ideal sinter material surface temperature can be obtained only by adjusting the current through the plasma power supply system, and compared with a combustion system of a coal gas ignition furnace, control is easy, stable and controllable.

Description

Technical Field

[0001] The utility model relates to the technical field of ignition furnaces, in particular to a plasma sintering ignition furnace and a system thereof. Background Art

[0002] Sintering is an important part of the ore preparation process in the metallurgical industry, especially in steel smelting. It is also one of the key operations that affects the energy consumption indicators of the entire smelting process.

[0003] At present, sintering ignition furnaces all use coal gas as fuel, such as blast furnace gas, mixed coal gas, coke oven gas, etc. This structure brings the following problems:

[0004] First, NOx caused by large amounts of gas combustion x , SO2, dust and other pollutant emissions, which increase the load on the desulfurization and denitrification equipment in the sintering process;

[0005] Second, the combustion system of the gas-fired ignition furnace includes gas pipelines, combustion air pipelines, valves and burners, etc. The system is complex and has high requirements for fire and explosion protection;

[0006] Third, combustion control involves gas flow detection, gas flow regulation, gas rapid shut-off, combustion air flow detection, combustion air flow regulation, air-fuel ratio control, furnace temperature detection and control, flame detection, etc. The system is complex and difficult to control. Utility Model Content

[0007] The main purpose of the utility model is to provide a plasma sintering ignition furnace and a system thereof, aiming to adopt clean energy and have a simple structure.

[0008] To achieve the above-mentioned purpose, the utility model proposes a plasma sintering ignition furnace, comprising a door frame, a plasma torch and a refractory material frame, wherein:

[0009] The portal frame includes side frames located on both sides and a top frame connecting the top ends of the two side frames. A refractory material frame is set under the top frame. Multiple plasma torches are set in the length direction of the top frame. The plasma torches pass through the top frame and the refractory material frame. The bottom end of the plasma torch extends from under the refractory material frame to ignite the sintered ore.

[0010] Preferably, the top frame and the plasma torch are threadedly connected.

[0011] Preferably, a connecting plate is mounted on the top frame, the connecting plate is connected to the top frame via angle steel, and a threaded hole is provided on the connecting plate for the plasma torch to pass through.

[0012] Preferably, the gap between the plasma torch and the refractory material frame is filled with refractory fibers.

[0013] Preferably, the side frame includes two vertical poles arranged opposite to each other, a side plate connecting the two vertical poles, and a support plate extending along the side plate toward the other side frame. The support plate is used to support the refractory material frame. The side plate is welded by steel sections and steel plates, and rollers are installed at the bottom of the vertical poles.

[0014] Preferably, the top frame is formed by welding multiple steel sections.

[0015] Preferably, the portal frame also includes side end frames located on both sides of the top frame, the side end frames include oppositely arranged columns and a support frame connecting the two columns, the support frame is used to enclose the plasma torch therein, the columns are fixedly connected to the vertical poles, and the two ends of the top frame are mounted on the support frames on both sides.

[0016] Preferably, a hook is prefabricated on the top of the refractory material frame, and a plurality of metal hanging members are provided on the top frame, and the bottoms of the metal hanging members are connected to the hook to hang the refractory material frame.

[0017] Preferably, the refractory material frame uses multiple refractory material precast bricks to form a gate-shaped structure, and adjacent refractory material precast bricks are connected by cast-in-place materials. The bottom of the gate-shaped structure of the refractory material frame is located above the support plate.

[0018] The utility model further proposes a plasma sintering ignition system, comprising the above-mentioned plasma sintering ignition furnace, a plasma power supply system electrically connected to the plasma torch of the plasma sintering ignition furnace, and a water cooling system and an air cooling system for cooling the plasma torch.

[0019] The plasma sintering ignition furnace proposed in this utility model has the following beneficial effects:

[0020] 1. Because it uses plasma for ignition, compared with existing technologies, it does not require traditional gas and only uses clean energy electricity and cooling water as energy media. There is no pollution emission caused by gas, so it is more environmentally friendly;

[0021] 2. Plasma is used for ignition. By adjusting the current through the plasma power supply system, a stable and ideal sintering material surface temperature can be obtained. Compared with the combustion system of a gas-fired ignition furnace, the control is simpler, more stable and controllable.

[0022] 3. The plasma sintering ignition furnace is equipped with a refractory frame, which can prevent the heat loss of ignition and improve energy utilization;

[0023] 4. The plasma sintering ignition furnace has the advantages of simple structure, easy implementation and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a schematic structural diagram of the first embodiment of the plasma sintering ignition furnace of the present invention along the cross-sectional direction of the sintering trolley;

[0025] Figure 2 This is a schematic structural diagram of the first embodiment of the plasma sintering ignition furnace of the present invention along the direction of sintering ore running;

[0026] Figure 3 This is a schematic structural diagram of the side frame of the first embodiment of the plasma sintering ignition furnace of the present utility model;

[0027] Figure 4 This is a schematic structural diagram of the top frame of the first embodiment of the plasma sintering ignition furnace of the present utility model;

[0028] Figure 5 This is a structural schematic diagram of the plasma torch installation of the first embodiment of the plasma sintering ignition furnace of the present invention from one perspective;

[0029] Figure 6 This is a schematic structural diagram of the plasma sintering ignition furnace according to the first embodiment of the present invention when the plasma torch is installed from another perspective;

[0030] Figure 7 This is a structural diagram of the first embodiment of the plasma sintering ignition furnace of the present invention when the refractory material frame is installed from one perspective;

[0031] Figure 8 This is a structural schematic diagram of the first embodiment of the plasma sintering ignition furnace of the present invention when the refractory material frame is installed from another perspective;

[0032] Figure 9 This is a schematic structural diagram of a side end frame in the second embodiment of the plasma sintering ignition furnace of the present utility model;

[0033] Figure 10 This is a schematic diagram of the partial structure of the plasma sintering ignition system of the present utility model.

[0034] In the figure, 1-sintered ore, 2-sintering trolley, 3-gantry frame, 31-side frame, 311-upright pole, 312-side plate, 313-support plate, 32-top frame, 321-connecting plate, 322-angle steel, 33-metal hanger, 34-side end frame, 341-upright column, 342-support frame, 4-refractory material frame, 41-hook, 42-cast-in-place material, 5-plasma torch, 6-refractory fiber.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The utility model provides a first embodiment of a plasma sintering ignition furnace.

[0038] Reference Figures 1 to 8 In this embodiment, a plasma sintering ignition furnace includes a door frame 3, a plasma torch 5 and a refractory material frame 4, wherein:

[0039] The portal frame 3 includes side frames 31 located on both sides and a top frame 32 connecting the top ends of the two side frames 31. A refractory material frame 4 is mounted below the top frame 32 (the top frame 32 supports the refractory material frame 4). A plurality of plasma torches 5 are arranged in the length direction of the top frame 32 (preferably, the plurality of plasma torches 5 are arranged at equal intervals to achieve uniform ignition). The plasma torch 5 passes through the top frame 32 and the refractory material frame 4, and the bottom end of the plasma torch 5 extends from below the refractory material frame 4 to ignite the sintered ore below it.

[0040] In this embodiment, refer to Figure 6 The top frame 32 and the plasma torch 5 are threadedly connected, making it easy to install and remove the plasma torch 5. The plasma torch 5 can be arranged in about 1-2 rows along the direction of travel of the sintering trolley 2; the distance between the bottom end of the plasma torch 5 and the surface of the sintered ore in the sintering trolley 2 is 200-800 mm, and this distance is adjustable.

[0041] In this embodiment, refer to Figure 4 and Figure 6 A connecting plate 321 is mounted on the top frame 32 , and the connecting plate 321 is connected to the top frame 32 via an angle steel 322 . A threaded hole is provided on the connecting plate 321 for the plasma torch 5 to pass through.

[0042] Further, refer to Figure 5 The gap between the plasma torch 5 and the refractory frame 4 is filled with refractory fibers 6 to further prevent heat loss.

[0043] Reference Figure 3 This embodiment proposes a specific structure of a side frame 31: the side frame 31 includes two oppositely arranged vertical rods 311, a side plate 312 connecting the two vertical rods 311, and a support plate 313 extending along the side plate 312 toward the other side frame 31. The support plate 313 is used to support the refractory material frame 4. The side plate 312 is welded by steel sections and steel plates. Rollers are installed at the bottom of the vertical rods 311 to realize the overall movement of the portal frame 3.

[0044] Reference Figure 4This embodiment provides a specific structure for a top frame 32: the top frame 32 is welded from multiple sections of steel. A connecting plate 321 is mounted on the top frame 32. The top frame 32 is welded to the side frames 31, forming a stable gate-shaped structure.

[0045] Reference Figure 7 and Figure 8 In this embodiment, the refractory material frame 4 uses multiple refractory precast bricks to form a gate-shaped structure, and adjacent refractory precast bricks are connected by cast-in-place material 42. The bottom of the gate-shaped structure of the refractory material frame 4 is located above the support plate 313.

[0046] Specifically, the refractory prefabricated bricks adopt a high-alumina refractory prefabricated block structure. The refractory prefabricated bricks are baked at 650°C to remove water in the manufacturing plant, which can shorten the on-site baking time of the ignition furnace from the traditional 7 days to 3 days, making the refractory frame 4 easy and quick to install and the masonry time short.

[0047] Furthermore, the V-shaped joint between the two prefabricated refractory bricks is filled on site with high-alumina castables, thereby ensuring the integrity and sealing of the furnace body refractory materials.

[0048] In this embodiment, a hook 41 is prefabricated on the top of the refractory frame 4, and a plurality of metal hangers 33 are provided on the top frame 32. The bottoms of the metal hangers 33 are connected to the hook 41 to suspend the refractory frame 4. The metal hangers 33 are fixed to the top frame 32 using nuts and washers.

[0049] The metal hanger 33 increases the connection between the middle portion of the refractory material frame 4 and the top frame 32, thereby improving the overall structural stability.

[0050] The working process of this plasma sintering ignition furnace is as follows: the high-temperature plasma flame generated by the plasma torch 5 acts directly on the surface of the sintered ore 1 from top to bottom, and the multiple high-temperature plasma flames arranged in an array form a uniform high-temperature zone on the surface along the width direction of the sintering trolley 2, igniting the top layer of the sintered ore 1 containing solid fuel. At the same time, the bellows located below the sintering trolley 2 draws ambient air into the sintered ore 1 layer on the sintering trolley 2 under the action of the fan suction and participates in the combustion and oxidation reaction. The sintered ore moves continuously with the sintering trolley 2, and the plasma ignition furnace continuously ignites and burns the surface of the sintered ore 1, completing the continuous sintering and ignition process of the sintered ore 1.

[0051] The plasma sintering ignition furnace proposed in this embodiment has the following beneficial effects:

[0052] 1. Because it uses plasma for ignition, compared with existing technologies, it does not require traditional gas and only uses clean energy electricity and cooling water as energy media. There is no pollution emission caused by gas, so it is more environmentally friendly;

[0053] 2. Plasma is used for ignition. By adjusting the current through the plasma power supply system, a stable and ideal sintering material surface temperature can be obtained. Compared with the combustion system of a gas-fired ignition furnace, the control is simpler, more stable and controllable.

[0054] 3. The plasma sintering ignition furnace is provided with a refractory frame 4, which can prevent the heat of ignition from being lost and improve energy utilization;

[0055] 4. The plasma sintering ignition furnace has the advantages of simple structure, easy implementation and stable and reliable operation.

[0056] Reference Figure 9 The utility model also provides a second embodiment of the plasma sintering ignition furnace.

[0057] This embodiment differs from the first embodiment in that the portal frame 3 further includes side frames 34 located on both sides of the top frame 32 (including both the inlet and outlet directions). The side frames 34 include opposing columns 341 and support frames 342 connecting the two columns 341. The support frames 342 are used to enclose the plasma torch 5 within them. The columns 341 are fixedly connected to the poles 311. The ends of the top frame 32 are mounted on the support frames 342 on both sides. The side frames 34 are welded to the top frame 32.

[0058] In this embodiment, the side end frames 34 are provided to increase the overall structural stability of the portal frame 3 .

[0059] The utility model also provides a plasma sintering ignition system.

[0060] Reference Figure 10 In this preferred embodiment, a plasma sintering ignition system includes a plasma sintering ignition furnace, a plasma power supply system electrically connected to the plasma torch 5 of the plasma sintering ignition furnace (via a cable), and a water cooling system and an air cooling system for cooling the plasma torch 5. The specific structure and beneficial effects of the plasma sintering ignition furnace are described in the above-mentioned embodiment and will not be further elaborated here.

[0061] Specifically, the water cooling system and the air cooling system can adopt common structures in the prior art. The plasma power supply system is connected to the factory AC380V power supply.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A plasma sintering ignition furnace, characterized in that: It includes a portal frame, a plasma torch and a refractory frame, wherein: The portal frame includes side frames located on both sides and a top frame connecting the top ends of the two side frames. A refractory material frame is set under the top frame. Multiple plasma torches are set in the length direction of the top frame. The plasma torches pass through the top frame and the refractory material frame. The bottom end of the plasma torch extends from under the refractory material frame to ignite the sintered ore.

2. The plasma sintering ignition furnace according to claim 1, characterized in that: The top frame is threadedly connected to the plasma torch.

3. The plasma sintering ignition furnace according to claim 2, characterized in that: A connecting plate is mounted on the top frame, the connecting plate is connected to the top frame via angle steel, and a threaded hole is provided on the connecting plate for the plasma torch to pass through.

4. The plasma sintering ignition furnace according to claim 2, characterized in that: The gap between the plasma torch and the refractory material frame is filled with refractory fibers.

5. The plasma sintering ignition furnace according to claim 1, characterized in that: The side frame includes two oppositely arranged vertical poles, side plates connecting the two vertical poles, and support plates extending along the side plates toward the other side frame. The support plates are used to support the refractory material frame. The side plates are welded by steel sections and steel plates, and rollers are installed at the bottom of the vertical poles.

6. The plasma sintering ignition furnace according to claim 5, characterized in that: The top frame is formed by welding a plurality of steel sections.

7. The plasma sintering ignition furnace according to claim 6, characterized in that: The portal frame also includes side frames located on both sides of the top frame. The side frames include oppositely arranged columns and a support frame connecting the two columns. The support frame is used to enclose the plasma torch inside it. The columns are fixedly connected to the poles. The two ends of the top frame are mounted on the support frames on both sides.

8. The plasma sintering ignition furnace according to any one of claims 1 to 7, characterized in that: A hook is prefabricated on the top of the refractory material frame, and a plurality of metal hanging pieces are passed through the top frame. The bottoms of the metal hanging pieces are connected to the hook to hang the refractory material frame.

9. The plasma sintering ignition furnace according to claim 5, characterized in that: The refractory material frame is formed of a gate-shaped structure using a plurality of refractory material precast bricks. Adjacent refractory material precast bricks are connected by cast-in-place materials. The bottom of the gate-shaped structure of the refractory material frame is located above the support plate.

10. A plasma sintering ignition system, characterized in that: The plasma sintering ignition furnace comprises the plasma sintering ignition furnace as claimed in any one of claims 1 to 9, further comprising a plasma power supply system electrically connected to the plasma torch of the plasma sintering ignition furnace, and a water cooling system and an air cooling system for cooling the plasma torch.

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