Converter gas pressure stabilizing structure and calorific value stabilizing device

Abstract

The application discloses a converter gas pressure stabilizing structure and a heat value stabilizing device, and belongs to the field of converter gas treatment. The device comprises a pressure stabilizing structure arranged in a mixed pipe of gas and nitrogen. The pressure stabilizing structure comprises a fixed frame and a movable disc. The fixed frame is fixedly connected in the mixed pipe, and the movable disc is movably arranged in the mixed pipe and close to one end of the gas input. A plurality of through holes are arranged on the movable disc. A plurality of conical cylinders are distributed on one side of the fixed frame facing the movable disc. The tip of the conical cylinder and the through hole form a gas passage. A plurality of steel sheets are arranged in the middle of the mixed pipe and form a mixed section. The pressure peak value of the converter gas supply is flattened by arranging the pressure stabilizing structure, and the trough is raised, so that the gas forms a relatively stable pressure environment in the mixed section. The turbulent flow state of the gas and nitrogen in the steel sheet area is maintained, and the mixing uniformity and the heat value control effect are improved.

Description

Technical Field

[0001] This invention relates to the field of converter gas treatment, and in particular to a converter gas pressure stabilization structure and calorific value stabilization device. Background Technology

[0002] The gas used in the galvanizing production line of the cold rolling mill is converter gas, with a calorific value fluctuating between 1200-1600 Kcal / Nm3, and a maximum value of 1600 Kcal / Nm3. The fluctuation in calorific value is not conducive to temperature control in the galvanizing furnace area. Furthermore, due to process reasons, the converter gas supplier cannot adjust the calorific value and instantaneous supply, thus failing to guarantee product quality. The furnace area equipment and refractory materials cannot withstand the impact of high calorific value.

[0003] In existing technologies, a coal-nitrogen mixing device is used to control the calorific value of converter gas. The flow rate of nitrogen is adjusted by a regulating valve, and the volume of nitrogen is controlled to form a convective mixing zone between nitrogen and coal gas. This controls the calorific value of the coal gas to meet the requirements of the galvanizing production line in the cold rolling mill. This method can achieve dual regulation of calorific value and flow rate of the gas after coal-nitrogen mixing, enhancing the stability of use. However, since the instantaneous supply of converter gas cannot be controlled, the instantaneous high-pressure gas may break through the mixing zone and reach the nitrogen supply zone. On the one hand, this will reduce the mixing effect and result in poor uniformity of the overall calorific value of the gas flow. On the other hand, the particulate matter mixed in the coal gas will block the nitrogen nozzle, leading to unstable nitrogen supply and further affecting the calorific value control effect. Summary of the Invention

[0004] To address the problem of reduced mixing effect and poor overall calorific value uniformity of the gas flow due to uncontrollable pressure fluctuations in converter gas, this invention provides a converter gas pressure stabilization structure and calorific value stabilization device, which can self-regulate the pressure stabilization of converter gas, thereby improving the uniformity of coal-nitrogen mixing and the calorific value control effect.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A converter gas pressure stabilizing structure is provided, which is installed inside a mixing pipe of gas and nitrogen and cuts off the mixing pipe. The pressure stabilizing structure includes a fixed frame and a movable plate. The fixed frame is fixedly connected inside the mixing pipe, and a through gap is opened on the fixed frame. The movable plate is movably set inside the mixing pipe near the gas input end, and several through holes are provided on the movable plate. The fixed frame has several cones distributed on the side facing the movable plate, and each cone corresponds to a through hole. A gas passage is formed between the tip of the cone and the through hole. A compression spring is installed between the fixed frame and the movable plate. The pressure of the converter gas pushes the compression spring to adjust the distance between the movable plate and the fixed frame, and to change the cross-sectional area of ​​the gas channel.

[0006] As another optimized solution for the converter gas pressure stabilization structure mentioned above, a flow-breaking rod is fixedly connected to the tip of the cone, and the flow-breaking rod passes through the through hole.

[0007] As another optimized solution for the above-mentioned converter gas pressure stabilization structure, a flow guiding channel is formed between the fixed frame and the movable plate, and a filter screen filled with activated carbon particles is provided in the flow guiding channel, with the tip of the cone passing through the filter screen.

[0008] As another optimized solution for the converter gas pressure stabilization structure mentioned above, the fixing frame is a plurality of concentric ring structures, and the cone cylinders are evenly distributed on each ring structure.

[0009] As another optimization scheme for the above-mentioned converter gas pressure stabilization structure, the bottom cross-section of the cone is larger than the area of ​​the through hole.

[0010] A converter gas calorific value stabilization device includes a mixing pipe, with a gas delivery pipe and a nitrogen delivery pipe fixedly connected to both ends of the mixing pipe, respectively. The end of the mixing pipe near the gas delivery pipe is set as a pressure stabilizing section, and the pressure stabilizing section is equipped with the aforementioned pressure stabilizing structure. Several staggered steel plates are arranged in the middle of the mixing pipe to form a mixing section, and an exhaust pipe is fixedly connected to the position of the mixing section.

[0011] As another optimized solution for the converter gas calorific value stabilization device, the mixing pipe is connected to the nitrogen delivery pipe through an outer sleeve. The nitrogen delivery pipe is fixedly connected to the bottom of the outer sleeve, and a nitrogen-filling space is formed between the outer sleeve and the mixing pipe. Several nitrogen-filling pipes connected to the nitrogen-filling space are fixedly connected to the inner wall of the mixing pipe.

[0012] As another optimized solution for the converter gas calorific value stabilization device, the nitrogen filling pipes are arranged in a ring-shaped, uniform distribution.

[0013] As another optimized solution for the converter gas calorific value stabilization device, several jet holes are evenly opened along the length of the nitrogen filling pipe, and the jet direction of the jet holes is towards the mixing section.

[0014] As another optimized solution for the converter gas calorific value stabilization device, the gas delivery pipe is connected to one end of the mixing pipe through a tapered flared structure.

[0015] The present invention has the following beneficial effects: 1) A pressure stabilizing structure is set up. The gas channel between the cone and the through hole in the pressure stabilizing structure can automatically adjust the opening according to the upstream pressure change. This flattens the pressure peaks that fluctuate greatly when supplying converter gas and raises the valleys, so that the gas forms a relatively stable pressure environment in the mixing section. This is conducive to maintaining the turbulent state of gas and nitrogen in the steel plate area, improving the mixing uniformity and calorific value control effect. 2) Set up an outer sleeve and a nitrogen filling pipe. Set up a ring-shaped nitrogen filling pipe at the nitrogen filling end. This will help the nitrogen gas to be evenly distributed in the mixing pipe and enhance the mixing rate and uniformity of the gas in the mixing section area.

[0016] The additional technical features and advantages of the present invention will become more apparent from the following description, or may be learned through practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the converter gas calorific value stabilization device in this invention; Figure 2 This is a frontal sectional view of the mixing tube; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the gas supply direction of the mixing pipe; Figure 5 This is a schematic diagram of a voltage regulator structure; Figure 6 This is a cross-sectional schematic diagram of the voltage stabilizing structure; Figure 7 This is a cross-sectional view of the mixing tube at the location of the outer sleeve; Figure 8 This is a schematic diagram of the voltage regulator component; Figure 9 This is a front cross-sectional view of the voltage regulator component; The reference numerals in the attached drawings are explained as follows: 1. Mixing pipe; 1a. Pressure stabilizing section; 1b. Mixing section; 2. Gas delivery pipe; 3. Nitrogen delivery pipe; 4. Exhaust pipe; 501. Fixed frame; 502. Movable disc; 503. Conical cylinder; 504. Through hole; 6. Flow-breaking rod; 7. Filter screen; 8. Guide rod; 9. Compression spring; 10. Steel sheet; 11. Outer sleeve; 12. Nitrogen filling pipe. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. Parts not explained in the following embodiments of the present invention, such as the converter gas supply end and the supporting equipment for nitrogen supply, are all considered to be prior art known or should be known by those skilled in the art.

[0019] Example 1

[0020] like Figure 5 and Figure 6As shown, a converter gas pressure stabilizing structure is installed inside a gas-nitrogen mixing pipe 1, which cuts off the mixing pipe 1. The pressure stabilizing structure includes a fixed frame 501 and a movable plate 502. The fixed frame 501 and the movable plate 502 completely occupy the inner diameter section of the mixing pipe 1. The fixed frame 501 and the movable plate 502 divide the mixing pipe 1 into left and right sections, so that the gas can only flow through the preset channel on the pressure stabilizing structure, and prevent the gas flow from bypassing the edge of the fixed frame 501 or the movable plate 502. The fixed frame 501 is fixedly connected inside the mixing pipe 1. The fixed frame 501 has a through gap for the gas to pass through. After the gas passes through the gap, it enters the subsequent mixing process. The movable plate 502 is movably set inside the mixing pipe 1 near the gas input end. The movable plate 502 has several through holes 504. The through holes 504 penetrate the surface of the movable plate 502. During manufacturing, it is necessary to ensure that the air permeability of the through holes 504 on the movable plate 502 reaches more than 65%, while ensuring the structural stability of the movable plate 502. Therefore, the diameter of the through holes 504 is 1 / 10 of the diameter of the movable plate 502, and the through holes 504 are arranged in multiple concentric rings. A number of cones 503 are fixedly connected to the side of the fixed frame 501 facing the movable plate 502, and the cones 503 correspond one-to-one with the through holes 504. That is, the axis of each cone 503 coincides with the axis of the corresponding through hole 504. The tip of the cone 503 faces the side of the movable plate 502 and passes through or extends into the corresponding through hole 504. A gas channel is formed between the cone 503 and the through hole 504. After the converter gas passes through the gas channel from the gas inlet side of the movable plate 502, it will be blocked and dissipate energy, and continue to flow along the cylinder wall of the cone 503. A compression spring 9 is provided between the fixed frame 501 and the movable plate 502. The compression spring 9 is sleeved on the guide rod 8, which is fixedly connected to the fixed frame 501 and slidably connected to the movable plate 502. The movable plate 502 can move along the axial direction of the guide rod 8 and compress or stretch the compression spring 9. The pressure of the converter gas pushes the compression spring 9 to adjust its distance from the fixed frame 501 and change the cross-sectional area of ​​the gas channel. When the pressure of the converter gas supply increases, the wind pressure on the solid part of the movable plate 502 increases, thereby moving closer to the fixed frame 501 and compressing the compression spring 9. The tip of the cone 503 penetrates the through hole 504 and... As the cylinder 503 moves relative to the through hole 504, the area occupied by the cylinder 503 in the through hole 504 increases, reducing the cross-sectional area of ​​the annular gas channel and enhancing the energy dissipation effect on the gas. When the converter gas pressure decreases, the elastic potential energy of the compression spring 9 is released, pushing the movable plate 502 away from the fixed frame 501. At this time, the cross-sectional area of ​​the annular gas channel increases, and the energy dissipation effect weakens. This achieves adaptive adjustment of the gas channel cross-sectional area with the fluctuation of gas pressure, significantly compressing the gas pressure fluctuation amplitude in the downstream mixing area, making the gas pressure fluctuation of the converter gas after passing through the pressure stabilizing structure more stable, achieving the effect of "peak shaving and valley filling". It is suitable for the transportation of industrial by-product gas with unstable supply pressure, such as converter gas.

[0021] In this embodiment, as Figure 5 and Figure 8 As shown, the tip of the cone 503 is fixedly connected to a flow-breaking rod 6, which penetrates the through hole 504. The flow-breaking rod 6 breaks the laminar boundary layer of the airflow at the inlet, making the flow field distribution before entering the annular gas channel more uniform, avoiding noise and vibration caused by excessive local flow velocity, and improving the operational stability of the pressure stabilizing structure.

[0022] Example 2

[0023] This embodiment is a further improvement on the voltage stabilizing structure in Embodiment 1, such as... Figure 3 and Figure 9As shown, a flow channel is formed between the fixed frame 501 and the movable plate 502. A filter bag 7 filled with activated carbon particles is installed in the flow channel. The tip of the cone 503 passes through the filter bag 7. The converter gas contains trace amounts of dust particles, sulfides, and tar vapors, etc. When the gas flows through the annular gas channel between the cone 503 and the through hole 504, it must pass through the filter bag 7 fitted on the cone 503. The activated carbon particles inside the filter bag utilize their well-developed microporous structure to intercept and purify the impurities in the gas through both physical and chemical adsorption. Furthermore, when the gas pressure increases, the filter bag 7 is squeezed by the movable plate 502 and moves from the tip of the cone 503 to the bottom, making the activated carbon particles inside the filter bag 7 more compact. This further improves the particle adsorption effect and pressure regulation effect, and increases the resistance distribution effect when the gas passes through, allowing the gas in the flow channel to be more evenly distributed in the cross-sectional space of the pipe, further enhancing the pressure stabilization effect.

[0024] In this embodiment, as Figure 6 As shown, the fixing frame 501 consists of multiple concentric ring structures, with cone cylinders 503 evenly distributed on each ring structure. The multiple concentric ring structures are fixed to each other by cross-shaped connecting ribs (or spokes). Under the premise of ensuring that the fixing frame 501 has sufficient structural strength and rigidity, the gap area on the fixing frame 501 is maximized, reducing the obstruction of the fixing frame 501 to the airflow, and ensuring that the gas can be evenly distributed on the cross section of the mixing pipe 1 after passing through the pressure stabilizing structure.

[0025] In this embodiment, the bottom cross-section of the cone 503 is larger than the area of ​​the through hole 504. This arrangement makes the displacement of the movable disc 502 match the pressure variation range of the gas, achieving full coverage of adaptive adjustment for different pressure conditions.

[0026] Example 3

[0027] like Figure 1 and Figure 2 As shown, a converter gas calorific value stabilization device includes a mixing pipe 1. Both ends of the mixing pipe 1 are fixedly connected to a gas delivery pipe 2 and a nitrogen delivery pipe 3, respectively. The end of the mixing pipe 1 closest to the gas delivery pipe 2 is set as a pressure stabilizing section 1a. The pressure stabilizing section 1a is provided with a pressure stabilizing structure as described in Example 2. Several staggered steel plates 10 are provided in the middle of the mixing pipe 1 to form a mixing section 1b. An exhaust pipe 4 is fixedly connected to the mixing section 1b. The steel plates 14 form several diversion, cutting, crossing and reversing channels for the gas and nitrogen in the mixing section 1b.

[0028] In this embodiment, as Figure 7As shown, the mixing tube 1 is connected to the nitrogen delivery tube 3 through an outer sleeve 11. The nitrogen delivery tube 3 is fixedly connected to the bottom of the outer sleeve 11, and a nitrogen-filling space is formed between the outer sleeve 11 and the mixing tube 1. Several nitrogen-filling tubes 12 that communicate with the nitrogen-filling space are fixedly connected to the inner wall of the mixing tube 1. The nitrogen-filling tubes 12 are arranged in a ring and are evenly distributed, which can improve the uniformity of nitrogen distribution in the internal space of the mixing tube 1.

[0029] In this embodiment, as Figure 7 As shown, the nitrogen filling pipe 12 has a number of jet holes evenly distributed along its length. The jet holes are directed toward the mixing section 1b. The arrangement of multiple jet holes transforms the concentrated nitrogen into a circumferential, multi-point, low-speed, and uniform airflow, achieving uniform circumferential distribution of nitrogen, avoiding flow deviation, and creating good initial conditions for subsequent mixing.

[0030] In this embodiment, as Figure 2 As shown, the gas delivery pipe 2 is connected to one end of the mixing pipe 1 through a tapered flared structure. The diameter of the gas delivery pipe 2 is smaller than that of the mixing pipe 1. The two are smoothly connected by a tapered flared structure, so that the gas enters the pressure stabilizing structure with a more uniform flow field, which is beneficial to the pressure balance of each force-bearing surface of the movable plate 502.

[0031] Working principle: When the device is working, for one end of the nitrogen delivery pipe 3 of the mixing pipe 1: the nitrogen supply source from the outside causes the nitrogen at a preset pressure to flow through the nitrogen delivery pipe 3. The nitrogen enters the nitrogen filling space between the outer sleeve 11 and the mixing pipe 1 from the nitrogen delivery pipe 3. After the pressure is equalized in this space, it is then sprayed into the internal space of the mixing pipe 1 through multiple annularly distributed nitrogen filling pipes 12 and their jet holes in a multi-point and multi-directional manner. The jet direction is towards the mixing section 1b. For one end of the gas delivery pipe 2 of the mixing pipe 1: the converter gas is input through the gas delivery pipe 2, and after being decelerated and diffused by the conical flaring structure, it enters the pressure stabilizing section 1a of the mixing pipe 1. In the pressure stabilizing section 1a, the gas first acts on the gas-facing surface of the movable plate 502, and the converter gas passes through the gas channel, the gas guide channel and the gap on the fixed frame 501 in sequence before reaching the mixing section 1b. During this process, when the pressure of the converter gas supply increases, the solid part of the movable disc 502 experiences greater wind pressure, causing it to move closer to the fixed frame 501 and compress the compression spring 9. The tip of the cone 503 penetrates the through hole 504, and as the cone 503 moves relative to the through hole 504, the area it occupies in the through hole 504 increases, reducing the cross-sectional area of ​​the annular gas channel and enhancing its energy dissipation effect on the gas. When the converter gas pressure decreases, the elastic potential energy of the compression spring 9 is released, pushing the movable disc 502 away from the fixed frame 501. At this time, the cross-sectional area of ​​the annular gas channel increases, and the energy dissipation effect weakens. Subsequently, the coal gas and nitrogen are mixed under the action of the steel plate 10 in the mixing section 1b, and finally discharged from the exhaust pipe 4 into the subsequent process flow, realizing the forced uniform mixing of coal gas and nitrogen. The two work together to achieve dual regulation of calorific value and gas pressure, thereby improving the usability of converter gas.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A converter gas pressure stabilizing structure, wherein the pressure stabilizing structure is disposed within a mixing pipe (1) for gas and nitrogen, and the mixing pipe (1) is cut off, characterized in that: The voltage stabilizing structure includes a fixed frame (501) and a movable plate (502); The fixed frame (501) is fixedly connected inside the mixing pipe (1). A through gap is provided on the fixed frame (501). The movable plate (502) is movably set inside the mixing pipe (1) at one end near the gas input. Several through holes (504) are provided on the movable plate (502). The fixed frame (501) has several cones (503) distributed on one side facing the movable plate (502), and the cones (503) correspond one-to-one with the through holes (504). A gas passage is formed between the tip of the cone (503) and the through hole (504). A compression spring (9) is provided between the fixed frame (501) and the movable plate (502). The movable plate (502) is pushed by the pressure of the converter gas to adjust the distance between it and the fixed frame (501) and change the cross-sectional area of ​​the gas channel.

2. The converter gas pressure stabilizing structure according to claim 1, characterized in that: The tip of the cone (503) is fixedly connected to a flow-breaking rod (6), which passes through the through hole (504).

3. The converter gas pressure stabilizing structure according to claim 1, characterized in that: A flow channel is formed between the fixed frame (501) and the movable plate (502), and a filter bag (7) filled with activated carbon particles is provided in the flow channel. The tip of the cone (503) passes through the filter bag (7).

4. The converter gas pressure stabilizing structure according to claim 1, characterized in that: The fixing frame (501) consists of multiple concentric ring structures, and the cones (503) are evenly distributed on each ring structure.

5. The converter gas pressure stabilizing structure according to claim 1, characterized in that: The bottom cross-section of the cone (503) is larger than the area of ​​the through hole (504).

6. A converter gas calorific value stabilization device, comprising a mixing pipe (1), wherein a gas conveying pipe (2) and a nitrogen conveying pipe (3) are respectively fixedly connected to both ends of the mixing pipe (1), characterized in that: The end of the mixing pipe (1) near the gas transmission pipe (2) is set as a pressure stabilizing section (1a). The pressure stabilizing section (1a) is provided with a pressure stabilizing structure as described in any one of claims 1-5. The middle part of the mixing pipe (1) is provided with a number of staggered steel plates (10) to form a mixing section (1b). The mixing section (1b) is fixedly connected to an exhaust pipe (4).

7. The converter gas calorific value stabilization device according to claim 6, characterized in that: The mixing tube (1) is connected to the nitrogen delivery tube (3) through an outer sleeve (11). The nitrogen delivery tube (3) is fixedly connected to the bottom of the outer sleeve (11). A nitrogen filling space is formed between the outer sleeve (11) and the mixing tube (1). Several nitrogen filling tubes (12) connected to the nitrogen filling space are fixedly connected to the inner wall of the mixing tube (1).

8. The converter gas calorific value stabilization device according to claim 7, characterized in that: The nitrogen filling tubes (12) are arranged in a ring-shaped, uniform distribution.

9. The converter gas calorific value stabilization device according to claim 7, characterized in that: The nitrogen filling pipe (12) has a number of jet holes evenly distributed along its length, and the jet direction of the jet holes is towards the mixing section (1b).

10. A converter gas calorific value stabilization device according to claim 6, characterized in that: The gas transmission pipe (2) is connected to one end of the mixing pipe (1) through a tapered flared structure.

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