An environment-friendly and energy-saving overhead torch head suitable for various working conditions

Abstract

The application discloses an environment-friendly and energy-saving overhead torch head suitable for various working conditions and belongs to the technical field of petroleum chemical combustible gas venting systems. The torch head comprises a torch head main pipe, multistage torch head branch pipes and a plasma igniter. The multistage torch head branch pipes are evenly distributed around the circumference of the torch head main pipe from the inside to the outside from the first stage to the nth stage. The pipe diameters of the first stage to the nth stage torch head branch pipes are increased in sequence, forming n levels of discharge structures. The torch head main pipe is in communication with the multistage torch head branch pipes and the plasma igniter. The torch head lifting structures are arranged in the multistage torch head branch pipes. The application can meet the requirements of combustion and discharge of various different discharge working conditions in the same overhead torch head and simultaneously reduce the operation cost requirements of the factory torch system.

Description

Technical Field

[0001] This invention belongs to the technical field of petrochemical combustible gas venting systems, and relates to an elevated flare head device, specifically an environmentally friendly and energy-saving elevated flare head suitable for various working conditions. Background Technology

[0002] Flare systems, also known as combustible gas emission systems, are mainly used to burn off combustible and toxic gases released in the event of an accident in petroleum, coal, or chemical plants. They are an important measure to ensure safe production and reduce environmental pollution.

[0003] Flare system emissions are divided into elevated flares and ground flares. Ground flares typically employ staged emissions with multiple burners for combustion, suitable for various emission conditions. Elevated flares, on the other hand, have multiple emission conditions burning and emitting within a single flare head, with emission rates for different conditions potentially differing by more than 30 times. Low flow rates can lead to incomplete combustion, producing black smoke and potentially damaging the flare; high flow rates can result in high back pressure, causing pressure buildup and other safety hazards. Previous elevated flare head designs only addressed the primary emission conditions, leaving the adverse effects of other emission conditions unaddressed.

[0004] The elevated flare head is typically ignited by a continuous lamp and requires constant nitrogen purging to prevent air from entering the upstream system and causing a backfire explosion. The fuel gas and nitrogen used for the continuous lamp are supplied continuously, resulting in resource waste and significantly increasing the plant's operating costs. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and proposes an environmentally friendly and energy-saving elevated flare head suitable for various working conditions; it can meet the requirements of combustion and emission of various emission conditions with large differences in the same elevated flare head, while reducing the operating costs of the factory flare system.

[0006] This invention is achieved through the following technical solution:

[0007] An environmentally friendly and energy-saving elevated flare head suitable for various working conditions includes a main flare head pipe, multi-stage flare head branch pipes, and a plasma igniter. The multi-stage flare head branch pipes are evenly distributed around the circumference of the main flare head pipe from the first stage to the nth stage, arranged sequentially from the inside out. The diameter of the branch pipes increases sequentially from the first stage to the nth stage, forming an n-stage emission structure. The main flare head pipe is connected to the multi-stage flare head branch pipes and the plasma igniter. Each of the multi-stage flare head branch pipes is equipped with a flare head lifting structure.

[0008] The torch head lifting structure includes a moving part and a stationary part; the stationary part includes a fluid-sealing sleeve and a baffle that are fixedly connected to the inner wall of the torch head branch pipe; the baffle is located above the fluid-sealing sleeve; the moving part includes a sealing inner tube, and a torch gas channel is provided on the side wall of the sealing inner tube; the sealing inner tube is slidably connected between the fluid-sealing sleeve and the baffle; the igniter outlet of the plasma igniter is located on one side of the first-stage torch head branch pipe.

[0009] Furthermore, a positioning rod is provided between the baffle and the fluid sealing structure sleeve; the positioning rod is sleeved inside the sealing inner tube and serves as a guide.

[0010] Furthermore, the static components of the lifting structure also include stiffening plates, which are arranged in a cross shape. The edges of the stiffening plates are connected to the inner walls of the branch pipes of each level of torch head, and the baffles are horizontally connected to the bottom surface of the stiffening plates.

[0011] Furthermore, the upper part of the fluid-sealed structure sleeve is cylindrical, and the lower part is frustoconical. The bottom of the frustoconical structure at the bottom of the fluid-sealed structure sleeve is connected to the inner wall of the branch pipe of each flare head.

[0012] Furthermore, the moving parts of the lifting structure also include a sealing conical tube and a sealing cover plate; the sealing conical tube is connected to the top of the sealing inner tube, and the top of the sealing conical tube is connected to the sealing cover plate; the sealing cover plate has a positioning rod hole in the center; the positioning rod passes through the positioning rod hole and extends into the fluid sealing structure sleeve.

[0013] Furthermore, the flare ducts are evenly arranged circumferentially on the side wall of the sealed inner tube.

[0014] Furthermore, the flare gas duct is designed to be elongated, and the exposed duct area changes linearly during the lifting and lowering process of the moving parts of the lifting structure.

[0015] Furthermore, flame stabilizing blocks are installed at the top of the branch pipes of the multi-stage flare heads.

[0016] Furthermore, the lower part of the torch head main pipe is connected to the torch head connecting flange, and a gas collection port is provided on the upper inner side of the torch head main pipe near the torch head connecting flange. The gas collection port is connected to the plasma igniter through the plasma igniter connecting flange.

[0017] Furthermore, the plasma igniter consists of an igniter gas pipe, an insulating protective pipe, a steel strand, an igniter outlet, and an igniter discharge electrode. The upper part of the igniter gas pipe is connected to the igniter outlet, and the lower side of the igniter gas pipe is connected to the flare gas inlet. The insulating protective pipe is fitted inside the igniter gas pipe and is fixed inside the igniter gas pipe by a fastener, leaving a gas passage. The insulating protective pipe wraps around the steel strand, and the lower end of the steel strand is connected to an electrical interface, which is connected to a high-voltage cable. The upper end of the steel strand is connected to the igniter discharge electrode, which is located slightly inside the center of the igniter outlet and has an annular gap channel for discharge and flare gas flow. The plasma igniter is fixed to the outside of the flare head main pipe by a plasma igniter fixing plate and a plasma igniter connecting flange.

[0018] The beneficial effects of this invention compared to the prior art are as follows:

[0019] 1. This invention increases the contact area between the flare gas and air during combustion by setting the flare head to a multi-branch outlet, thereby achieving better smokeless combustion and protecting the environment.

[0020] 2. By setting the flare head to have multiple branch outlets and installing a lifting structure at each branch outlet, the sequential opening and closing of the lifting structure is automatically adjusted according to the flow rate and back pressure, ensuring that flare gas with different emission volumes burns within the set emission rate range, thereby improving the lifespan of the flare head and the reliability of combustion.

[0021] 3. When no flare gas is emitted, each branch of the present invention is in a closed state, with only a very small gap in the closed part. The gaps and openings of the entire flare head are small, and a small amount of nitrogen gas can be used to purge the flare head to ensure a slight positive pressure, thus saving nitrogen gas consumption.

[0022] 4. The torch head of this invention uses plasma ignition to ionize the emitted torch gas, forming high-temperature plasma that spontaneously combusts upon contact with air, thus igniting itself. Combined with the torch lifting structure, it can ignite the torch head in a timely manner, eliminating the need for a continuous lamp, saving fuel gas, and saving enterprises millions of yuan in fuel gas costs annually.

[0023] 5. This invention uses a plasma igniter that utilizes the principle of plasma arc, which has high discharge energy and can ionize various gases such as torch gas, air, and nitrogen. After being blown out, it forms a high-temperature plasma flame, which can ignite its own torch gas and directly ignite the primary torch gas, thus igniting the torch head. Its ignition reliability is guaranteed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the environmentally friendly and energy-saving torch head described in this invention;

[0025] Figure 2 This is a top view of an environmentally friendly and energy-saving torch head;

[0026] Figure 3 This is a schematic diagram of the operating status of the torch head lifting structure; where: a) lifting structure closed; b) lifting structure half-open; c) lifting structure fully open;

[0027] Figure 4 This is a schematic diagram of the static components of the torch head lifting structure;

[0028] Figure 5 yes Figure 4 View from direction A;

[0029] Figure 6 yes Figure 4 View from direction B;

[0030] Figure 7 This is a schematic diagram of the moving parts of the torch head lifting structure;

[0031] Figure 8 yes Figure 7 CC view in the middle;

[0032] Figure 9 This is a schematic diagram of the structure of the torch head plasma igniter.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Torch head connecting flange; 2. Torch head main pipe; 3. Plasma igniter; 4. Torch head lifting structure; 5. Third-stage torch head branch pipe; 6. Flame stabilizer block; 7. Second-stage torch head branch pipe; 8. First-stage torch head branch pipe; 9. Plasma igniter fixing plate; 10. Plasma igniter connecting flange; 11. Gas collection port; 12. Moving parts of the lifting structure; 13. Static parts of the lifting structure; 14. High-voltage cable; 15. Fluid-sealed structure sleeve; 16. Positioning rod; 17. Baffle; 18. Rib plate; 19. Sealing inner tube; 20. Sealing conical tube; 21. Sealing cover plate; 22. Torch gas channel; 23. Positioning rod hole; 24. Electrical interface; 25. Torch gas inlet; 26. Steel strand; 27. Insulating protection tube; 28. Ignition gas pipe; 29. ​​Ignition outlet; 30. Ignition discharge electrode; 31. Fixing component. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0036] See Figures 1 to 9This embodiment proposes an environmentally friendly and energy-saving elevated flare head suitable for various working conditions, including a flare head main pipe 2, a primary flare head branch pipe 8, a secondary flare head branch pipe 7, a tertiary flare head branch pipe 5, a plasma igniter 3, and a flare head connecting flange 1. The lower part of the flare head main pipe 2 is connected to the flare head connecting flange 1, and the upper part of the flare head main pipe 2 is connected to the primary flare head branch pipe 8, the secondary flare head branch pipe 7, and the tertiary flare head branch pipe 5. A gas collecting port 11 is provided on the upper inner side of the flare head main pipe 2 near the flare head connecting flange 10, and the gas collecting port 11 is connected to the plasma igniter 3 through the plasma igniter connecting flange 10.

[0037] The system includes multiple primary flare head branch pipes 8, secondary flare head branch pipes 7, and tertiary flare head branch pipes 5 (six in this embodiment). All three branch pipes are coaxial with the main flare head pipe 2 and are evenly distributed circumferentially from the inside out. The diameters of the branch pipes increase sequentially, forming a three-stage emission structure.

[0038] Among them, flame stabilizing blocks 6 are installed at the top of the first-stage flare head branch pipe 8, the second-stage flare head branch pipe 7, and the third-stage flare head branch pipe 5.

[0039] In use, the flare gas is discharged from the outlets of the primary flare head branch pipe 8, the secondary flare head branch pipe 7, the tertiary flare head branch pipe 5, and the plasma igniter 3 through the flare head connecting flange 1 and the flare head main pipe 2.

[0040] The elevated flare head adopts a multi-branch outlet. As the emission volume increases, the branch pipes at each level are opened step by step from the first to the third level, so that the emission rate of flare gas with different emission volumes is kept within the design range.

[0041] Reference Figure 1 and Figure 3 The primary torch head branch pipe 8, the secondary torch head branch pipe 7, and the tertiary torch head branch pipe 5 are all equipped with torch head lifting structures 4, which are divided into moving lifting components 12 and stationary lifting components 13.

[0042] Reference Figures 4 to 8 The lifting structure moving part 12 consists of a sealed inner tube 19, a sealed conical tube 20, and a sealed cover plate 21. The sealed conical tube 20 is connected to the top of the sealed inner tube 19, and the top of the sealed conical tube 20 is connected to the sealed cover plate 21. The side wall of the sealed inner tube 19 is provided with flare gas channels 22, which are evenly arranged circumferentially; the sealed cover plate 21 is provided with a positioning rod hole 23 in the center.

[0043] The static component 13 of the lifting structure consists of a fluid-sealing sleeve 15, a positioning rod 16, a baffle 17, and a stiffening plate 18 inside each branch pipe. The upper part of the fluid-sealing sleeve 15 is cylindrical, and the lower part is frustoconical. The bottom of the frustoconical lower part of the fluid-sealing sleeve 15 is connected to the inner wall of each branch pipe.

[0044] The stiffening plates 18 are arranged in a cross shape to fix the baffle 17. The edges of the stiffening plates 18 are connected to the inner walls of each branch pipe, and the baffle 17 is horizontally connected to the bottom surface of the stiffening plates 18. A positioning rod 16 is welded below the center of the baffle 17. The positioning rod 16 passes through the positioning rod hole 23 of the lifting structure moving part 12 and extends a certain distance into the center of the fluid sealing structure sleeve 15. The lifting structure moving part 12 is fitted inside the fluid sealing structure sleeve 15, and the positioning rod 16 is fitted inside the lifting structure moving part 12, serving as a guide. The lifting structure moving part 12 can move up and down between the fluid sealing structure sleeve 15 and the baffle 17 without deviating.

[0045] In use, the weight of the lifting mechanism moving part 12 is determined according to the opening pressure of each stage of the flare head branch pipe. Those with the same opening pressure are in the same stage, and those with a higher opening pressure are in the next stage. The number of branch pipes in each stage and the total number of branch pipe stages are designed according to various actual emission conditions. For example, the weight of the lifting mechanism moving part 12 in the first-stage flare head branch pipe 8 is less than the weight of the lifting mechanism moving part 12 in the second-stage flare head branch pipe 7; the weight of the lifting mechanism moving part 12 in the second-stage flare head branch pipe 7 is less than the weight of the lifting mechanism moving part 12 in the third-stage flare head branch pipe 5.

[0046] In use, the flare gas duct 22 is designed to be elongated, and the exposed duct area changes linearly during the lifting process, ensuring uniform lifting of the moving part 12 of the lifting structure and reducing surge. The number and size of the flare gas duct 22 are determined according to the exhaust gas volume design.

[0047] During operation, the lifting mechanism 12 is automatically adjusted to raise and lower according to the exhaust gas volume and back pressure, and the flare branch pipes at each level open and close sequentially according to the pressure.

[0048] Reference Figure 9The plasma igniter 3 consists of an igniter gas pipe 28, an insulating protective pipe 27, a steel strand 26, an igniter outlet 29, and an igniter discharge electrode 30. The upper part of the igniter gas pipe 28 is connected to the igniter outlet 29, and the lower side of the igniter gas pipe 28 is connected to the flare gas inlet 25. The insulating protective pipe 27 is fitted inside the igniter gas pipe 28 and is fixed inside the igniter gas pipe 28 by a fastener 31, leaving a gas passage. The insulating protective pipe 27 wraps the steel strand 26, and the lower end of the steel strand 26 is connected to an electrical interface 24, which is connected to the high-voltage cable 14. The upper end of the steel strand 26 is connected to the igniter discharge electrode 30, which is located slightly inside the center of the igniter outlet 29 and has an annular gap channel for discharge and flare gas flow. The plasma igniter 3 is fixed to the outside of the flare head main pipe 2 by a plasma igniter fixing plate 9 and a plasma igniter connecting flange 10.

[0049] The implementation principle of an environmentally friendly and energy-saving elevated flare head applicable to various working conditions in this application embodiment is as follows: when no flare gas is emitted, the lifting components of each branch pipe of the flare are in the closed state, that is... Figure 3 State a. A slight positive pressure is maintained inside the flare head by purging with a small amount of nitrogen, preventing air from entering the flare head and reducing nitrogen consumption to 1 m³. 3 / h, which is more than 10 times less nitrogen consumption than the same export torch head.

[0050] As the flare gas begins to vent and the volume of flare gas increases, the pressure in the flare head and its upstream pipeline increases. The plasma igniter 3 will first release the flare gas. Based on the pressure signal, the plasma igniter 3 will be energized and ignited for 20 seconds, generating a high-temperature plasma arc. This arc is blown out of the plasma igniter outlet by the flare gas, forming a plasma flame. Upon contact with air, the plasma igniter 3 will ignite itself, keeping the flame burning. As the venting volume and pressure increase again, the first-stage flare gas branch pipe 8 will open. Simultaneously, the plasma igniter 3 will be energized again for 20 seconds based on the pressure signal. Relying on the strong ignition characteristics of the plasma igniter 3, it ensures that the first-stage flare gas branch pipe 8 can be successfully ignited under any circumstances. As the venting volume and pressure increase again, the flare gas branch pipes at each level will open successively. The branch pipes at the second level and above will be ignited by the first-stage branch pipe. The branch pipes at each level and of the same level have the function of mutual ignition, keeping the entire flare head in a state of combustion. As the venting volume and pressure decrease, the flare gas branch pipes at each level are closed sequentially from largest to smallest. After all branch pipes are closed, the flare head is quickly purged with nitrogen according to the set flare head and pipeline pressure to replace the flare gas and extinguish the plasma igniter 3, thus ending the venting process of the flare head.

[0051] By adopting the above technical solution, the elevated flare head uses a multi-branch outlet with a lifting structure in each branch, realizing the multi-stage emission function of the elevated flare head. As the emission volume increases, each branch pipe opens sequentially, keeping the flare gas emission rate within the designed range for different emission volumes. When each lifting structure is closed, only a small annular gap remains, allowing for minimal nitrogen purging to maintain a slight positive pressure inside the flare head and prevent air from entering the interior or upstream. The plasma igniter utilizes the principle of plasma arc, with high discharge energy, capable of ionizing various gases such as flare gas, air, and nitrogen. After being blown out, it forms a high-temperature plasma flame that can directly ignite its own flare gas, achieving flare head ignition. Combined with the flare lifting structure, it can ignite the flare head promptly, eliminating the need for a continuous lamp.

[0052] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. An environmentally friendly and energy-saving elevated flare head suitable for various working conditions, characterized in that, It includes a flare head main pipe (2), multi-stage flare head branch pipes and a plasma igniter (3); the multi-stage flare head branch pipes are evenly distributed around the circumference of the flare head main pipe (2) from the first stage to the nth stage; the pipe diameters of the flare head branch pipes from the first stage to the nth stage increase sequentially, forming an n-stage emission structure; the flare head main pipe (2) is connected to the multi-stage flare head branch pipes and the plasma igniter (3) respectively; each of the multi-stage flare head branch pipes is equipped with a flare head lifting structure (4). The torch head lifting structure (4) includes a moving part (12) and a stationary part (13); the stationary part (13) includes a fluid sealing structure sleeve (15) and a baffle (17) fixedly connected to the inner wall of the torch head branch pipe; the baffle (17) is located above the fluid sealing structure sleeve (15); the moving part (12) includes a sealing inner tube (19); the side wall of the sealing inner tube (19) is provided with a torch gas channel (22); the sealing inner tube (19) slides up and down between the fluid sealing structure sleeve (15) and the baffle (17); the igniter outlet (29) of the plasma igniter (3) is located on one side of the first-stage torch head branch pipe; A positioning rod (16) is provided between the baffle (17) and the fluid sealing structure sleeve (15); the positioning rod (16) is sleeved inside the sealing inner tube (19) and plays a guiding role; the upper part of the fluid sealing structure sleeve (15) is a cylindrical structure and the lower part is a frustum-shaped structure, and the bottom of the lower frustum-shaped structure of the fluid sealing structure sleeve (15) is connected to the inner wall of the branch pipe of each torch head; The lifting structure moving part (12) also includes a sealing conical tube (20) and a sealing cover plate (21); the sealing conical tube (20) is connected to the top of the sealing inner tube (19), and the top of the sealing conical tube (20) is connected to the sealing cover plate (21); the sealing cover plate (21) has a positioning rod hole (23) in the center; the positioning rod (16) passes through the positioning rod hole (23) and extends into the fluid sealing structure sleeve (15); the weight of the lifting structure moving part (12) is determined according to the opening pressure of the torch head branch pipes of each level. The same opening pressure is the same level, and the higher opening pressure is the next level.

2. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 1, characterized in that, The static component (13) of the lifting structure also includes stiffeners (18), which are arranged in a cross shape. The edges of the stiffeners (18) are connected to the inner walls of the branch pipes of each torch head, and the baffles (17) are horizontally connected to the bottom surface of the stiffeners (18).

3. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 1, characterized in that, The flare vents (22) are evenly arranged circumferentially on the side wall of the sealed inner tube (19).

4. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 3, characterized in that, The torch gas duct (22) is designed to be elongated. During the lifting process of the moving part (12) of the lifting structure, the exposed duct area of ​​the torch gas duct (22) changes linearly.

5. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 1, characterized in that, Flame stabilizing blocks (6) are installed at the top of the branch pipes of the multi-stage flare heads.

6. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 1, characterized in that, The lower part of the torch head main pipe (2) is connected to the torch head connecting flange (1). The upper inner side of the torch head main pipe (2) near the torch head connecting flange (1) is provided with a gas collection port (11). The gas collection port (11) is connected to the plasma igniter (3) through the plasma igniter connecting flange (10).

7. The environmentally friendly and energy-saving elevated flare head suitable for various working conditions according to claim 1, characterized in that, The plasma igniter (3) consists of an igniter gas pipe (28), an insulating protective tube (27), a steel strand (26), an igniter outlet (29), and an igniter discharge electrode (30). The upper part of the igniter gas pipe (28) is connected to the igniter outlet (29), and the lower side of the igniter gas pipe (28) is connected to the torch gas inlet (25). The insulating protective tube (27) is fitted inside the igniter gas pipe (28). The insulating protective tube (27) is fixed inside the igniter gas pipe (28) by a fastener (31), leaving a gas passage. 7) Wrap the steel strand (26), the lower end of the steel strand (26) is connected to the electrical interface (24), and is connected to the high-voltage cable (14) through the electrical interface (24); the upper end of the steel strand (26) is connected to the igniter discharge electrode (30), the igniter discharge electrode (30) is set at the center of the igniter outlet (29) with an annular gap channel for discharge and torch gas passage, and the plasma igniter (3) is fixed to the outside of the torch head main pipe (2) through the plasma igniter fixing plate (9) and the plasma igniter connecting flange (10).

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