Environment-friendly energy-saving elevated torch head suitable for various working conditions

Abstract

The invention discloses an environment-friendly energy-saving elevated torch head suitable for various working conditions, and belongs to the technical field of petrochemical engineering combustible gas emptying systems. Comprising a torch head main pipe, multiple stages of torch head branch pipes and plasma igniters. The multiple stages of torch head branch pipes are sequentially and evenly distributed around the circumference of the torch head main pipe from the first stage to the nth stage from inside to outside. The pipe diameters of the torch head branch pipes from the first stage to the nth stage are sequentially increased to form n stages of discharge structures; the torch head main pipe is respectively communicated with the multi-stage torch head branch pipe and the plasma igniter; flare head lifting structures are arranged in the multiple stages of flare head branch pipes; the requirement for combustion emission in the same elevated torch head under various emission working conditions with large differences can be met, and meanwhile the requirement for the operation cost of a factory torch system is lowered.

Description

Technical Field

[0001] The present invention belongs to the technical field of the flammable gas venting system in petrochemical industry, and relates to an elevated flare tip device, specifically an environment-friendly and energy-saving elevated flare tip applicable to various working conditions. Background Art

[0002] The flare system, also known as the flammable gas emission system, is mainly used to burn the flammable and toxic gases vented during accident conditions in factories such as petrochemical and coal chemical industries, and is an important measure to ensure the safe production of factories and reduce environmental pollution.

[0003] The flare system emissions are divided into elevated flares and ground flares. A ground flare emission system mostly adopts staged emissions, and multiple burners are used for combustion treatment, which is applicable to various emission working conditions. In an elevated flare, multiple emission working conditions are burned and emitted in one flare tip. The emission rates in the flare tip for different emission working conditions may differ by more than 30 times. For small flow rates, there are situations where incomplete combustion generates black smoke and smoldering burns out the flare; for large flow rates, there are adverse safety situations such as high emission back pressure, which causes the flare system to be blocked. The previous designs of elevated flare tips can only be designed by grasping the main emission working conditions, and the adverse effects caused by other emission working conditions always exist.

[0004] The elevated flare tip is usually ignited by a pilot light and requires continuous nitrogen purging to prevent air from entering the upstream system of the flare tip and causing flashback explosion. The fuel gas and nitrogen used for the pilot light are continuously supplied, resulting in waste of resources and adding a significant operating cost to the factory. Summary of the Invention

[0005] The present invention overcomes the deficiencies of the prior art and provides an environment-friendly and energy-saving elevated flare tip applicable to various working conditions; it can meet the requirements of burning and emitting multiple emission working conditions with large differences in the same elevated flare tip, and at the same time reduce the operating cost requirements of the factory flare system.

[0006] The present invention is realized by the following technical solutions: An environment-friendly and energy-saving elevated flare tip applicable to various working conditions, comprising a flare tip main pipe, multi-stage flare tip branch pipes, and a plasma igniter; the multi-stage flare tip branch pipes are evenly distributed around the circumference of the flare tip main pipe in sequence from the first stage to the nth stage from the inside to the outside. The diameters of the flare tip branch pipes from the first stage to the nth stage increase in sequence, forming an emission structure with n levels; the flare tip main pipe is respectively communicated with the multi-stage flare tip branch pipes and the plasma igniter; flare tip lifting structures are provided in all the multi-stage flare tip branch pipes; The lifting structure of the torch head includes a moving part and a static part of the lifting structure; the static part of the lifting structure includes a fluid sealing structure sleeve and a baffle plate fixedly connected to the inner wall of the torch head branch pipe; the baffle plate is located above the fluid sealing structure sleeve, and the moving part of the lifting structure includes a sealing inner pipe with torch air channels provided on the side wall of the sealing inner pipe. The sealing inner pipe is slidably connected up and down between the fluid sealing structure sleeve and the baffle plate; the outlet of the igniter of the plasma igniter is located on one side of the first-stage torch head branch pipe.

[0007] Further, a positioning rod is arranged between the baffle plate and the fluid sealing structure sleeve; the positioning rod is sleeved inside the sealing inner pipe to play a guiding role.

[0008] Further, the static part of the lifting structure further includes a rib plate arranged in a cross shape. The edge of the rib plate is connected to the inner wall of each stage of the torch head branch pipe, and the baffle plate is horizontally connected to the bottom surface of the rib plate.

[0009] Further, the upper part of the fluid sealing structure sleeve is a cylindrical structure, and the lower part is a frustum-shaped structure. The bottom of the lower frustum-shaped structure of the fluid sealing structure sleeve is connected to the inner wall of each stage of the torch head branch pipe.

[0010] Further, the moving part of the lifting structure further includes a sealing conical pipe and a sealing cover plate; the sealing conical pipe is connected to the top of the sealing inner pipe, and the top of the sealing conical pipe is connected to the sealing cover plate; a positioning rod hole is provided in the center of the sealing cover plate; the positioning rod passes through the positioning rod hole and extends into the fluid sealing structure sleeve.

[0011] Further, the torch air channels are circumferentially and uniformly arranged on the side wall of the sealing inner pipe.

[0012] Further, the torch air channels are set to be strip-shaped, and during the lifting and lowering process of the moving part of the lifting structure, the area of the exposed channels of the torch air channels changes linearly.

[0013] Further, flame stabilizing blocks are provided at the tops of the multi-stage torch head branch pipes.

[0014] Further, the lower part of the torch head main pipe is communicated with the torch head connection flange, and a gas collecting port is provided on the inner side of the upper part of the torch head main pipe near the torch head connection flange. The gas collecting port is communicated with the plasma igniter through the plasma igniter connection flange.

[0015] Furthermore, the plasma igniter is composed of an igniter air pipe, an insulating protective tube, a steel strand, an igniter outlet and an igniter discharge electrode. The upper part of the igniter air pipe is connected to the igniter outlet, and the lower part of the igniter air pipe is connected to the flare gas inlet. The igniter air pipe is sleeved with an insulating protective tube, and the insulating protective tube is fixed in the igniter air pipe by a fixing part, leaving an air duct; the insulating protective tube wraps the steel strand, and the lower end of the steel strand is connected to the electrical interface, which is connected to the high-voltage cable through the electrical interface; the upper end of the steel strand is connected to the igniter discharge electrode, and the igniter discharge electrode is arranged at the center inner position of the igniter outlet, leaving an annular gap channel for discharging and passing the flare gas, and the plasma igniter is fixed to the outer side of the flare head main pipe by a plasma igniter fixing plate and a plasma igniter connecting flange.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention increases the contact area between the flare gas and the air during combustion by arranging the flare head with multiple branch outlets, thereby achieving better smokeless combustion and protecting the environment.

[0017] 2. By setting the flare head with multiple branch outlets and setting a lifting structure at each branch outlet, the opening and closing of the lifting structure is automatically adjusted according to the flow rate and back pressure, so that the flare gas with different emission amounts can be burned within the set emission rate range, thereby improving the life of the flare head and the reliability of combustion.

[0018] 3. When the flare gas is not discharged, the branches of the present invention are in a closed state, and only a very small slit is left in the closed part. The slit opening of the entire flare head is small, and a small amount of nitrogen purge can ensure a slight positive pressure on the flare head, thereby saving nitrogen consumption.

[0019] 4. The torch head of the present invention adopts plasma ignition to ionize the discharged torch gas to form a high-temperature plasma, which spontaneously ignites when encountering air to achieve the purpose of igniting itself. Combined with the torch lifting structure, the torch head can be ignited in time, eliminating the need for a permanent lamp, saving fuel gas, and saving the company millions of yuan in fuel gas costs each year.

[0020] 5. The present invention uses a plasma igniter that utilizes the principle of plasma arc, has high discharge energy, and can ionize various gases such as torch gas, air, nitrogen, etc., and form a high-temperature plasma flame after blowing out, which can not only ignite its own torch gas, but also directly ignite the first-level torch gas to ignite the torch head, and its ignition reliability is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the environmentally friendly and energy-saving flare head of the present invention; Figure 2 This is a top view of the environmentally friendly and energy-saving flare head; Figure 3It is a schematic diagram of the operating state of the lifting structure of the torch head; where: a. The closed state of the lifting structure; b. The semi-open state of the lifting structure; c. The fully open state of the lifting structure; Figure 4 It is a schematic diagram of the static components of the torch head lifting structure; Figure 5 It is Figure 4 the view from direction A of Figure 6 It is Figure 4 the view from direction B of Figure 7 It is a schematic diagram of the moving components of the torch head lifting structure; Figure 8 It is Figure 7 the sectional view taken along line C-C in Figure 9 It is a schematic diagram of the plasma igniter structure of the torch head.

[0022] Explanation of the reference numerals: 1. Torch head connection flange; 2. Torch head main pipe; 3. Plasma igniter; 4. Torch head lifting structure; 5. Tertiary torch head branch pipe; 6. Flame stabilizing block; 7. Secondary torch head branch pipe; 8. Primary torch head branch pipe; 9. Plasma igniter fixing plate; 10. Plasma igniter connection flange; 11. Gas collection port; 12. Moving components of the lifting structure; 13. Static components of the lifting structure; 14. High-voltage cable; 15. Fluid sealing structure sleeve; 16. Positioning rod; 17. Baffle; 18. Rib plate; 19. Sealing inner pipe; 20. Sealing conical pipe; 21. Sealing cover plate; 22. Torch air hole passage; 23. Positioning rod hole; 24. Electrical interface; 25. Torch gas inlet; 26. Steel strand; 27. Insulation protection pipe; 28. Igniter gas pipe; 29. Igniter outlet; 30. Igniter discharge electrode; 31. Fixing piece. Detailed implementation manners

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail in combination with the embodiments and the drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solutions of the present invention will be described in detail below in combination with the embodiments and the drawings, but the protection scope is not limited hereby.

[0024] Refer to Figures 1 to 9, in this embodiment, an environmentally friendly and energy-saving elevated flare head applicable to various working conditions is proposed, which includes a flare head main pipe 2, a first-stage flare head branch pipe 8, a second-stage flare head branch pipe 7, a third-stage flare head branch pipe 5, a plasma igniter 3 and a flare head connection flange 1. The lower part of the flare head main pipe 2 is communicated with the flare head connection flange 1, and the upper part of the flare head main pipe 2 is communicated with 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. An air collecting port 11 is arranged on the inner side of the upper part of the flare head main pipe 2 close to the flare head connection flange 1, and the air collecting port 11 is communicated with the plasma igniter 3 through a plasma igniter connection flange 10.

[0025] Among them, there are multiple first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5 (six in this embodiment); the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5 are all coaxial with the flare head main pipe 2, and the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5 are evenly distributed in a circumferential direction from the inside to the outside. The diameters of the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5 increase in sequence, forming three levels of emission structures.

[0026] Among them, flame stabilizing blocks 6 are arranged at the tops of the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5.

[0027] During use, the flare gas passes through the flare head connection flange 1 and the flare head main pipe 2 and is discharged from the outlets of the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7, third-stage flare head branch pipes 5 and the plasma igniter 3.

[0028] The elevated flare head adopts a multi-branch outlet. As the discharge gas volume increases, the branch pipes of each level are gradually opened from the first stage to the third stage, so that the discharge rate of the flare gas with different discharge gas volumes is stabilized within the designed range.

[0029] Refer to Figure 1 and Figure 3 , flare head lifting structures 4 are arranged in the first-stage flare head branch pipes 8, second-stage flare head branch pipes 7 and third-stage flare head branch pipes 5. The flare head lifting structures 4 are divided into lifting structure moving parts 12 and lifting structure static parts 13.

[0030] Refer to Figures 4 to 8 , the lifting structure moving part 12 is composed of a sealed inner pipe 19, a sealed conical pipe 20 and a sealed cover plate 21. The sealed conical pipe 20 is connected to the top of the sealed inner pipe 19, and the top of the sealed conical pipe 20 is connected to the sealed cover plate 21. Torch air channels 22 are arranged on the side wall of the sealed inner pipe 19, and the torch air channels 22 are evenly arranged in a circumferential direction; a positioning rod hole 23 is arranged at the center of the sealed cover plate 21.

[0031] The static component 13 of the lifting structure consists of a fluid sealing structure sleeve 15, a positioning rod 16, a baffle 17, and a rib plate 18 inside each level of the branch pipe. The upper part of the fluid sealing structure sleeve 15 is a cylindrical structure, and the lower part is a frustum-shaped structure. The bottom of the lower frustum-shaped structure of the fluid sealing structure sleeve 15 is connected to the inner wall of each level of the branch pipe; The rib plates 18 are arranged in a cross shape and are used to fix the baffle 17. The edges of the rib plates 18 are connected to the inner wall of each level of the branch pipe, and the baffle 17 is horizontally connected to the bottom surface of the rib 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 moving component 12 of the lifting structure and extends a certain distance into the center of the fluid sealing structure sleeve 15. The moving component 12 of the lifting structure is sleeved inside the fluid sealing structure sleeve 15, and the positioning rod 16 is sleeved inside the moving component 12 of the lifting structure, playing a guiding role; the moving component 12 of the lifting structure can move up and down between the fluid sealing structure sleeve 15 and the baffle 17 without deviation.

[0032] During use, the weight of the moving component 12 of the lifting structure is determined according to the opening pressure of each level of the flare head branch pipe. Those with the same opening pressure are of the same level, and those with a larger opening pressure are of the subsequent level. The number of branch pipes at each level and the total number of branch pipe levels are designed according to various actual emission conditions. For example, the weight of the moving component 12 in the first-level flare head branch pipe 8 is less than the weight of the moving component 12 in the second-level flare head branch pipe 7; the weight of the moving component 12 in the second-level flare head branch pipe 7 is less than the weight of the moving component 12 in the third-level flare head branch pipe 5.

[0033] During use, the flare gas channel 22 is set to be strip-shaped, and the area of the channel exposed during the lifting process changes linearly, enabling the moving component 12 of the lifting structure to lift evenly and reducing surging. The number and size of the flare gas channels 22 are designed and determined according to the emission gas volume.

[0034] During operation, the lifting of the moving component 12 of the lifting structure is automatically adjusted according to the emission gas volume and back pressure, and each level of the flare branch pipe opens and closes in sequence according to the pressure.

[0035] Refer to Figure 9, the plasma igniter 3 is composed of an igniter gas pipe 28, an insulation protection pipe 27, a steel stranded wire 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 communicates with the flare gas inlet 25. The insulation protection pipe 27 is sleeved inside the igniter gas pipe 28 and is fixed in the igniter gas pipe 28 through a fixing member 31, leaving an air passage; the insulation protection pipe 27 wraps the steel stranded wire 26, the lower end of the steel stranded wire 26 is connected to an electrical interface 24 and is connected to the high-voltage cable 14 through the electrical interface 24; the upper end of the steel stranded wire 26 is connected to the igniter discharge electrode 30, and the igniter discharge electrode 30 is arranged at a position slightly inside the center of the igniter outlet 29, leaving an annular gap channel for discharging and passing the flare gas. The plasma igniter 3 is fixed to the outside of the flare head main pipe 2 through a plasma igniter fixing plate 9 and a plasma igniter connecting flange 10.

[0036] The implementation principle of an environmentally friendly and energy-saving elevated flare head applicable to various working conditions in the embodiment of the present application is as follows: When the flare gas is not discharged, the lifting components of each flare branch pipe are in a closed state, that is Figure 3 in state a. Through a small amount of nitrogen purging, a slightly positive pressure inside the flare head is ensured, so that air cannot enter the flare head, and the nitrogen consumption is reduced to 1 m 3 / h, which is more than 10 times less than the nitrogen consumption of a flare head with the same outlet.

[0037] As the flare gas starts to be vented and the flare gas volume increases, the pressure of the flare head and its upstream pipe network increases. The plasma igniter 3 will first discharge the flare gas. According to the pressure signal, the plasma igniter 3 is powered on to ignite for 20 s, generating a high-temperature plasma arc, which is blown out of the plasma igniter outlet by the flare gas to form a plasma flame. When it meets the air, it ignites itself, keeping the plasma igniter 3 in a flame combustion state; as the venting air volume and pressure increase again, the first-stage flare gas branch pipe 8 opens, and at the same time, the plasma igniter 3 is powered on to ignite again for 20 s according to the pressure signal. Relying on the strong ignition characteristics of the plasma igniter 3, it is ensured that in any case, the first-stage flare gas branch pipe 8 can be successfully ignited; as the venting air volume and pressure increase again, the flare gas branch pipes of each stage are successively opened, and the branches above the second stage are ignited by the first-stage branch. The branches of each stage and the same stage have the function of being able to ignite each other, making the entire flare head in a combustion state. As the venting air volume and pressure decrease, the flare gas branch pipes of each stage are successively closed from large to small. After all the branch pipes are closed, according to the set pressure of the flare head and the pipe network, the flare head is quickly purged with nitrogen to displace the flare gas and extinguish the plasma igniter 3, ending the present venting process of the flare head.

[0038] By adopting the above technical solutions, the elevated flare head adopts multi-branch outlets, and a lifting structure is arranged on each branch, realizing the multi-stage discharge function of the elevated flare head. As the discharge gas volume increases, the branch pipes at all levels are gradually opened, so that the discharge rate of the flare gas with different discharge gas volumes is stabilized within the designed range. When each lifting structure is in the closed state, only a very small annular gap channel is left, and with a small amount of nitrogen purging, the slightly positive pressure inside the flare head can be ensured, preventing air from entering the interior and upstream. The plasma igniter utilizes the principle of plasma arc, with high discharge energy, which can ionize various gases such as flare gas, air, and nitrogen. After being blown out, a high-temperature plasma flame is formed, which can directly ignite the self-flare gas to achieve the ignition of the flare head. Cooperating with the flare lifting structure, the flare head can be ignited in time, eliminating the need for a pilot light.

[0039] The above content is a further detailed description of the present invention in combination with specific preferred implementation manners. It cannot be determined that the specific implementation manners of the present invention are limited thereto. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the premise of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.

Claims

1. An environmentally friendly and energy-saving elevated flare head applicable to various working conditions, characterized in that, It includes a torch head main pipe (2), multi-stage torch head branch pipes, and a plasma igniter (3); the multi-stage torch head branch pipes are evenly distributed around the circumference of the torch head main pipe (2) from the first stage to the nth stage in order from the inside out; the pipe diameters of the torch head branch pipes from the first stage to the nth stage increase in sequence, forming an emission structure with n levels; the torch head main pipe (2) is respectively communicated with the multi-stage torch head branch pipes and the plasma igniter (3); a torch head lifting structure (4) is arranged in each of the multi-stage torch head branch pipes; The torch head lifting structure (4) includes a lifting structure moving part (12) and a lifting structure static part (13); the lifting structure static part (13) includes a fluid sealing structure sleeve (15) fixedly connected to the inner wall of the torch head branch pipe and a baffle (17); the baffle (17) is located above the fluid sealing structure sleeve (15), and the lifting structure moving part (12) includes a sealing inner pipe (19), and a torch air hole channel (22) is arranged on the side wall of the sealing inner pipe (19), and the sealing inner pipe (19) is slidably connected 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.

2. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 1, wherein A positioning rod (16) is arranged between the baffle (17) and the fluid sealing structure sleeve (15); the positioning rod (16) is sleeved in the sealing inner pipe (19) and plays a guiding role.

3. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 2, wherein, The lifting structure static part (13) further includes a rib plate (18), the rib plate (18) is arranged in a cross shape, the edges of the rib plate (18) are connected to the inner walls of the torch head branch pipes at all levels, and the baffle (17) is horizontally connected to the bottom surface of the rib plate (18).

4. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 2, wherein, 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 walls of the torch head branch pipes at all levels.

5. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 4, wherein The lifting structure moving part (12) further includes a sealing tapered pipe (20) and a sealing cover plate (21); the sealing tapered pipe (20) is connected to the top of the sealing inner pipe (19), and the top of the sealing tapered pipe (20) is connected to the sealing cover plate (21); a positioning rod hole (23) is arranged at the center of the sealing cover plate (21); the positioning rod (16) passes through the positioning rod hole (23) and extends into the fluid sealing structure sleeve (15).

6. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 1, wherein, The torch air hole channels (22) are circumferentially and evenly arranged on the side wall of the sealing inner pipe (19).

7. An environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 6, characterized in that, The torch air hole channels (22) are arranged in a long strip shape, and during the lifting process of the lifting structure moving part (12), the area of the exposed hole channels of the torch air hole channels (22) changes linearly.

8. An environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 1, characterized in that, Flame stabilizing blocks (6) are arranged at the tops of all the multi-stage torch head branch pipes.

9. The environmentally friendly and energy-saving elevated flare head applicable to multiple working conditions according to claim 1, characterized in that, The lower part of the torch head main pipe (2) is communicated with a torch head connection flange (1), and a gas collecting port (11) is arranged on the inner side of the upper part of the torch head main pipe (2) close to the torch head connection flange (1), and the gas collecting port (11) is communicated with the plasma igniter (3) through a plasma igniter connection flange (10).

10. The environmental protection and energy-saving elevated flare head applicable to multiple working conditions according to claim 1, characterized in that, The plasma igniter (3) consists of an igniter gas pipe (28), an insulating protection pipe (27), a steel stranded wire (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 communicated with the torch gas inlet (25). The insulating protection pipe (27) is sleeved inside the igniter gas pipe (28), and the insulating protection pipe (27) is fixed inside the igniter gas pipe (28) through a fixing member (31) to leave an air passage; the insulating protection pipe (27) wraps the steel stranded wire (26), the lower end of the steel stranded wire (26) is connected to an electrical interface (24), and is connected to a high-voltage cable (14) through the electrical interface (24); the upper end of the steel stranded wire (26) is connected to the igniter discharge electrode (30), and the igniter discharge electrode (30) is arranged at a position slightly inside the center of the igniter outlet (29), leaving an annular gap channel for discharging and passing the torch gas. The plasma igniter (3) is fixed on the outside of the torch head main pipe (2) through a plasma igniter fixing plate (9) and a plasma igniter connecting flange (10).

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