Blast furnace gas tundish oxygen-enriched combustion device

Abstract

The utility model discloses a blast furnace gas tundish oxygen-enriched combustion device which comprises a natural gas pipeline arranged in the middle, an air pipeline sleeved with the natural gas pipeline in the middle, a natural gas pipeline supporting frame arranged at the bottom of the natural gas pipeline and a gas pipeline sleeved with the air pipeline. Oxygen enters the oxygen chamber through the oxygen pipeline; an oxygen chamber partition plate is arranged at the lower part of the gas pipeline chamber upper cover, the tail section of the gas pipeline is connected with an upper fastening flange and concentrically connected with a lower fastening flange side by side, a refractory cement base is connected below the lower fastening flange, and a combustion pipe is sleeved on the inner side of the refractory cement base; the middle area of the air pipeline is connected with the speed-increasing pipe, and the tail section is connected with the turbulence piece. The oxygen-enriched combustion device for the blast furnace gas tundish is high in flame rigidity, and solves the problems of blow-off, flameout, low temperature rise speed, inconvenience in disassembly and the like of low-heating-value gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of baking device, concretely to a blast furnace gas tundish oxygen-enriched combustion device. BACKGROUND

[0002] In steel metallurgical enterprises, the tundish is used to hold the molten steel smelted in the converter process and then poured into the continuous casting ladle. In general enterprises, the tundish device is usually baked by converter gas produced in the converter smelting process. However, in order to achieve better economic benefits, some steel metallurgical enterprises use the converter gas for power generation and use the blast furnace gas produced in the blast furnace ironmaking process for baking the tundish device. Because the blast furnace gas has a low calorific value of only 800 large calories, the baking device is prone to fireout and blowout during the baking process of the tundish, resulting in gas leakage, affecting the safety in production, and the tundish baking device needs to add wood or other fuels for ignition during use, which is low in efficiency and temperature, and the flame is severely spillover, the flame rigidity is not strong, and the temperature rising speed is not fast. SUMMARY

[0003] The utility model provides a blast furnace gas tundish oxygen-enriched combustion device to solve the problem of low rigidity of the baking flame of the tundish baking device, low thermal efficiency, low baking temperature, and serious energy waste.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following scheme:

[0005] A blast furnace gas tundish oxygen-enriched combustion device comprises a natural gas pipeline arranged in the middle, an air pipeline arranged around the natural gas pipeline, a natural gas pipeline support frame arranged at the bottom of the natural gas pipeline, and a gas pipeline arranged around the air pipeline; an oxygen chamber partition plate is arranged at the lower part of the upper cover of the gas pipeline chamber, an upper fastening flange is connected to the end of the gas pipeline, and a lower fastening flange is connected in a concentric and side-by-side manner; a refractory cement base is connected below the lower fastening flange, and a combustion pipe is arranged around the inner side of the refractory cement base; a speed-increasing pipe is connected to the middle region of the air pipeline, and a turbulent sheet is connected to the end of the air pipeline.

[0006] The first end of the oxygen pipeline is sleeved with a loose flange, the first end of the natural gas pipeline is sleeved with a loose flange, the first end of the air pipeline is sleeved with a loose flange, and the first end of the gas pipeline is sleeved with a loose flange.

[0007] Further, the end of the oxygen pipeline is connected to the lower end surface of the air pipeline; the oxygen chamber, the gas pipeline, and the upper end cover are all provided with air holes connected to the air pipeline; an oxygen chamber partition plate is arranged at the lower end of the oxygen chamber, and oxygen dispersion holes are arranged around the joint between the oxygen chamber and the air pipeline in the middle.

[0008] Further, the air pipe intermediate connection is a speed-increasing pipe, a plurality of small holes are formed in the central region of the speed-increasing pipe in a ring shape, and the air pipe end section is connected to a turbulent flow sheet, the rotational angle of the turbulent flow sheet is not less than 20°, the rotational groove is not less than 16, and the groove width is not less than 20 mm.

[0009] Further, the coal gas pipe is connected to the upper fastening flange and the lower fastening flange at the end section, the upper fastening flange and the lower fastening flange are sealed by a graphite metal winding gasket, and the upper fastening flange and the lower fastening flange are connected by a bolt gasket elastic pad nut.

[0010] Further, the refractory cement base is provided with a plurality of support rib plates uniformly distributed in the circumferential direction of the upper end of the refractory cement base.

[0011] Further, the refractory cement base is provided with a plurality of support rib plates uniformly distributed in the circumferential direction of the upper end of the refractory cement base.

[0012] The blast furnace gas intermediate package oxygen-enriched burner has the unique structure, the flame rigidity is high, the problems of low heat value gas flameout, slow temperature rising speed and inconvenient disassembly are solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a sectional view of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0014] Figure 2 It is a front view of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0015] Figure 3 It is a plan view of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0016] Figure 4 It is a front view of the first step of the welding process of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0017] Figure 5 It is a front view of the second step of the welding process of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0018] Figure 6 It is a front view of the third step of the welding process of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model;

[0019] Figure 7 It is a front view of the fourth step of the welding process of the blast furnace gas intermediate package oxygen-enriched combustion device of the utility model.

[0020] Specific reference signs are as follows:

[0021] 1. Oxygen pipeline; 2. Natural gas pipeline; 3. Air pipeline; 4. Coal gas pipeline; 5. Oxygen chamber; 6. Primary premixing chamber; 7. Secondary premixing chamber; 8. Chemical combustion chamber; 9. Refractory cement base; 10. Supporting stiffener; 11. Refractory cement castable; 12. Supporting nail; 13. Natural gas pipeline support frame; 14. Combustion pipe; 15. Speed-increasing pipe; 16. Upper fastening flange; 17. Lower fastening flange; 18. Turbulence plate; 19. Oxygen dispersion hole; 20. Oxygen chamber partition; 21. Upper end cover. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] like Figures 1-7 As shown, this utility model discloses an oxygen-enriched combustion device for blast furnace gas tundish, including a natural gas pipeline 2 set in the middle, which is sleeved in the center of an air pipeline 3. A natural gas pipeline support frame 13 is set at the bottom of the natural gas pipeline 2. A gas pipeline 4 is sleeved on the outside of the air pipeline 3. An oxygen chamber partition 20 is set at the lower part of the upper cover of the gas pipeline 4. The end of the gas pipeline 4 is connected to an upper fastening flange 16 and a lower fastening flange 17 connected concentrically. The lower fastening flange 17 is connected to a refractory cement base 9. A combustion pipe 14 is sleeved on the inside of the refractory cement base 9. An acceleration pipe 15 is connected in the middle area of ​​the air pipeline 3 and a turbulence plate 18 is connected at the end. Oxygen enters oxygen chamber 5 through oxygen pipe 1. In the primary premixing chamber 6, coal gas, a small amount of oxygen, and air are premixed for the first time. In the secondary premixing chamber 7, air, oxygen, and coal gas are fully premixed. In the chemical combustion chamber 8, blast furnace gas, oxygen, and air are burned, and flames are ejected outwards. The chemical combustion chamber 8 can be considered the third premixing chamber, where accelerated premixing is performed. This structural design, with the gas gradually mixed in three chambers, improves the rigidity of the combustion flame.

[0024] like Figure 1 As shown, the oxygen pipe 1 is connected to the lower end of the air pipe 3. The oxygen chamber 5, the gas pipe 4, the upper end cover 21, the air pipe 3 running through the middle, and the lower end are provided with an oxygen chamber partition 20. Oxygen dispersion holes 19 are circumferentially opened in the central area of ​​the air pipe 3 in the middle of the oxygen chamber 5. The oxygen introduced into the oxygen chamber 5 is oxygen that has been depressurized by the oxygen pipe 1, still carrying a certain pressure. It is dispersed into the air pipe 3 through the oxygen dispersion holes 19 and does not mix with the gas.

[0025] like Figure 1As shown, the air pipe 3, intermediate connection is speed tube 15, the speed tube 15 center area ring has several small holes, the air pipe 3 end section is connected to the turbulence sheet 18, the turbulence sheet 18 angle of rotation is not less than 20°, the number of rotation slots is less than or equal to 16, the slot width is not less than or equal to 20mm; the turbulence sheet 18 is made of 310S stainless steel. This can ensure smooth and stable gas flow, greatly reducing the turbulence.

[0026] As shown in the figure, Figure 1 The oxygen pipe 1 is sleeved with a live flange at the first end, the natural gas pipe 2 is sleeved with a live flange at the first end, the air pipe 3 is sleeved with a live flange at the first end, and the coal gas pipe 4 is sleeved with a live flange at the first end. The live flange is convenient to connect with the butt flange during installation, and is easy to disassemble.

[0027] The coal gas pipe 3 is connected with the upper fastening flange 16 and the lower fastening flange 17 at the end, the upper fastening flange 16 and the lower fastening flange 17 are sealed with a graphite metal winding gasket in the middle, and the upper fastening flange 16 and the lower fastening flange 17 are connected with bolt gasket and elastic nut. The lower end of the lower fastening flange 17 is connected with the refractory cement base 9. If the refractory cement base 9 is damaged by burning, it can be directly disassembled and replaced. After the refractory cement base 9, the dust and dirt adhered to the turbulence sheet 18 can also be cleaned, which is convenient to operate.

[0028] The refractory cement base 9 is internally provided with support nails 12 and is filled with refractory cement pouring material 11, and the combustion pipe 14 is installed in the middle. A plurality of support nails 12 are welded to the lower surface of the end cover of the refractory cement base 9, which is mainly used to fasten the refractory cement pouring material 11 and prevent the refractory cement pouring material 11 from falling off due to vibration in the state of cover overturning, thereby affecting the service life of the tundish burner.

[0029] As shown in the figure, Figure 2 The refractory cement base 9 is provided with a plurality of support rib plates 10 in the circumferential direction of the upper end. Its main function is to improve the overall strength of the tundish combustion device.

[0030] The speed tube 15 is a size head, and a plurality of small holes are arranged in the middle area in a ring shape.

[0031] As shown in the figure, Figures 4-7 The installation sequence of the blast furnace gas tundish oxygen-enriched combustion device is shown to ensure the processing quality in actual production and processing and improve the rigidity of the combustion flame.

[0032] First step Figure 4 ): Position the refractory cement base 9, assemble the coal gas pipe 4, and start welding the natural gas pipe support frame 13;

[0033] Second stepFigure 5 ), positioning air pipe 3, welding gas pipe 4, gas pipe 4 and upper fastening flange 16, oxygen chamber partition 20;

[0034] Third step Figure 6 ), welding the upper cover plate of air pipe 3, welding natural gas pipe 2, welding oxygen pipe 1.

[0035] Fourth step Figure 7 ), upper fastening flange 16 and lower fastening flange 17 are matched, and are fastened by bolts, nuts and gaskets, and metal winding gaskets are additionally arranged in the middle.

[0036] Through the above design and optimization, the blast furnace gas tundish oxygen-enriched combustion device has strong flame rigidity, high baking temperature, long service life of the tundish combustion device, and is safe, efficient and energy-saving.

[0037] The above is only the preferred embodiment of the utility model, and it should be pointed out that the above preferred embodiment should not be regarded as the limitation of the utility model, and the protection scope of the utility model should be limited by the scope defined by the claims. For ordinary skilled persons in the art, several improvements and refinements can be made without departing from the spirit and scope of the utility model, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A blast furnace gas tundish oxygen-enriched combustion device, characterized in that, include: A natural gas pipeline installed in the middle, an air pipeline sleeved around the natural gas pipeline in the middle, a natural gas pipeline support frame installed at the bottom of the natural gas pipeline, and a gas pipeline sleeved around the outside of the air pipeline; Oxygen enters the oxygen chamber through an oxygen pipeline, and an oxygen chamber partition is installed at the bottom of the gas pipeline chamber cover; the upper fastening flange is connected to the end of the gas pipeline, and the lower fastening flange is connected concentrically; a refractory cement base is connected below the lower fastening flange, and a combustion tube is sleeved inside the refractory cement base; an acceleration tube is connected to the middle area of ​​the air pipeline, and a turbulence plate is connected to the end.

2. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The oxygen pipeline is connected to the lower end of the air pipeline at its end; the oxygen chamber, gas pipeline, and upper cover are all provided with vent holes that connect to the air pipeline; an oxygen chamber partition is provided at the lower end of the oxygen chamber, and oxygen dispersion holes are circumferentially opened at the junction of the oxygen chamber and the middle air pipeline.

3. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The oxygen pipeline is fitted with a slip-on flange at the beginning, the natural gas pipeline is fitted with a slip-on flange at the beginning, the air pipeline is fitted with a slip-on flange at the beginning, and the coal gas pipeline is fitted with a slip-on flange at the beginning.

4. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The air duct is connected to a speed-increasing tube in the middle, and the speed-increasing tube has several small holes circumferentially opened in the central area.

5. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The air duct is connected to a turbulence plate at its end.

6. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The turbulence plate has a swirl angle of less than or equal to 20°, swirl grooves of less than or equal to 16, and groove width of not less than 20 mm.

7. The oxygen-enriched combustion device for blast furnace gas tundish according to claim 1, characterized in that, The gas pipeline is connected at the end with an upper fastening flange and a lower fastening flange; the upper and lower fastening flanges are sealed with a graphite metal spiral wound gasket, and the upper and lower fastening flanges are connected by bolts, washers, spring washers and nuts.

8. The blast furnace gas tundish oxygen-enriched combustion device according to claim 1, characterized in that, The refractory cement base has a support nail welded to its internal cavity, which is filled with refractory cement castable, and a combustion tube is installed in the middle.

9. The blast furnace gas tundish oxygen-enriched combustion device according to claim 1, characterized in that, Several supporting ribs are evenly distributed around the upper circumference of the refractory cement base.

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