Ejector type premixed high-altitude venting combustion device
Patent Information
- Application Number
- CN202521979326.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-15
AI Technical Summary
[0004]为了解决高空放空燃烧装置在高空强风、多雨环境不能稳定燃烧，工业放空系统的不能安全、环保、稳定运行的问题，现提供一种高空放空燃烧装置，对其内部结构进行改进后，能够实现高空防控燃烧装置中混合气混合均匀，且在复杂环境下能稳定燃烧，安全环保
1. 设置防护罩能够使燃烧装置在雨水、强风等环境下，能够稳定燃烧。
Smart Images
Figure CN224801676U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of industrial combustion equipment technology, specifically relating to an ejector-type premixed high-altitude venting combustion device. Background Technology
[0002] In industrial processes such as petroleum refining, chemical synthesis, and natural gas extraction and storage, various combustible waste gases are inevitably generated. To prevent these waste gases from being directly released into the atmosphere, causing environmental pollution and posing risks of explosions or fires, the industry generally uses high-altitude flare systems to treat them by combustion. This involves transporting the combustible waste gases to a high-altitude flare head, where they are burned before being released.
[0003] As the "heart" of an upper-level flare system, the continuous flame lamp's core function is to maintain stable combustion during flare system operation, ensuring instantaneous ignition of exhaust gases upon emission and preventing unburned gas leakage. However, the harsh upper-level environment, frequently affected by strong winds and rain, leads to unstable combustion. Therefore, a combustion device is needed that can optimize the combustion structure to achieve stable combustion even in strong winds and heavy rain at high altitudes, ensuring the safe, environmentally friendly, and stable operation of industrial flare systems. Utility Model Content
[0004] To address the issues of unstable combustion in high-altitude venting combustion devices under strong winds and heavy rain, and the unsafe, environmentally unfriendly, and unstable operation of industrial venting systems, a high-altitude venting combustion device is provided. After improvements to its internal structure, it can achieve uniform mixing of the gas mixture in the high-altitude venting combustion device and stable combustion in complex environments, ensuring safety and environmental protection.
[0005] To achieve the above objectives, the present invention proposes the following technical solution: an ejector-type premixed high-altitude venting combustion device, comprising a protective cover, an ignition device, and an ejector premixing device, wherein the ignition device is disposed on one side of the upper part of the protective cover, and the front part of the ejector premixing device is disposed in the lower inner cavity of the protective cover. The ignition device includes: an ignition combustion ejector tube that is connected through the side of the protective cover, a high-energy igniter disposed in the lower chamber of the ignition gas ejector tube, an ignition gas pipe connected to the lower part of the high-energy igniter, and an ignition gas inlet pipe connected to the lower part of the ignition gas pipe. The ejector premixing device includes: a flame stabilizer disposed in the lower inner cavity of the protective cover, an ejector premixing tube connected to the lower part of the flame stabilizer, and a gas premixing component disposed at the lower part of the ejector premixing tube.
[0006] Preferably, the upper part of the ignition gas ejector tube is provided with an ejector combustion hole along its circumference.
[0007] Preferably, the lower part of the high-energy igniter is fitted inside the ignition gas pipe.
[0008] Preferably, the tilt angle of the protective cover is set to correspond to the tilt angle of the upper part of the ejector premix tube, and the tilt angle is 20-40°.
[0009] Preferably, an annular boss is provided in the middle of the inner cavity of the flame stabilizer, and a through hole is provided on the annular boss; The flame stabilizer outlet is provided with an outwardly tapered opening.
[0010] Preferably, the lower sidewall of the annular boss forms an outwardly expanding conical cavity; an annular groove is provided on the upper side of the annular boss, and a through hole extends from the annular groove to the lower sidewall of the annular boss.
[0011] Preferably, the ejector premix tube and the ignition device are connected by a connector; The ejector premix tube includes a lower contraction section, a middle mixing section, and an upper diffusion section connected to the flame stabilizer; The lower part of the contraction section is a straight tube, and the upper part is an inwardly tapered tube; the contraction angle of the contraction section is 15-30°; The ratio of the inlet area to the outlet area of the contraction section is 2:1 to 3:1; The mixing section is a straight pipe; the ratio of the length of the mixing section to its diameter is 3-8. The lower part of the diffuser section is a straight pipe, and the upper part is an outwardly expanding tapered pipe.
[0012] Preferably, the gas premixing assembly includes a main gas inlet pipe connected to the lower part of the ejector premixing pipe via a connector, a main gas nozzle disposed at the head of the main gas inlet pipe, a locking nut sleeved on the outside of the main gas inlet pipe, and a combustion air regulating disc movably disposed on the upper part of the main gas inlet pipe between the inlet of the ejector premixing pipe and the locking nut.
[0013] Preferably, the ratio of the inlet area of the ejector premix tube to the outlet area of the main gas nozzle is 150-200.
[0014] Preferably, the gas pressure in the main gas inlet pipe is ≥50 kPa.
[0015] The beneficial effects of this utility model are: 1. Installing a protective cover enables the combustion device to burn stably in environments such as rain and strong winds.
[0016] 2. In this utility model, an ejector combustion hole is provided at the upper part of the gas ejector tube along its circumference. Through the ejector principle, air is drawn in from the air using the kinetic energy of the ignition gas to provide ignition air for the ignition gun.
[0017] 3. Installing a flame stabilizer before the ejector premixing tube can prevent flameout caused by excessive velocity differences, and it is not affected by airflow turbulence, thus not increasing the burner's heat load and ensuring flame stability. The optimization of the ejector premixing tube ensures thorough mixing of combustion air and fuel gas, providing a uniform fluid for the subsequent combustion reaction.
[0018] 4. Combustion air regulating disc: This disc adjusts the amount of combustion air entering the system by moving up and down, ensuring the proper mixing ratio of combustion air and fuel gas. The ratio of the inlet area of the injector premixing pipe to the outlet area of the main fuel gas nozzle is optimized to balance the jet kinetic energy and air entrainment capacity.
[0019] 5. This utility model has a simple structure, is easy to use, has low cost, and good effect. It mainly utilizes the ejector principle to efficiently premix gas and air, improve combustion efficiency and flame temperature, and achieves windproof and rainproof functions. This enables the burner to burn stably and continuously under complex environmental conditions, ensuring the safe, environmentally friendly, and stable operation of the industrial venting system. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the flame stabilizer in this utility model; Figure 3 This is a schematic diagram of the internal structure of the flame stabilizer in this utility model; Figure 4 This is a schematic diagram of the structure of the present invention when the combustion air is fully open; Figure 5 This is a schematic diagram of the structure of the present invention when the combustion air is fully shut off; In the diagram: 1. Main gas inlet pipe; 2. Locking nut; 3. Combustion air regulating disc; 4. Main gas nozzle; 5. Injector premixing pipe; 6. Contraction section; 7. Mixing section; 8. Diffusion section; 9. Flame stabilizer; 10. Ignition gas injector pipe; 11. High-energy igniter; 12. Ignition gas pipe; 13. Ignition gas inlet pipe; 14. Annular boss; 15. Annular groove; 16. Conical opening; 17. Through hole; 18. Ignition device; 19. Injector premixing device. Detailed Implementation
[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0022] like Figure 1-5The illustrated ejector-type premixed high-altitude venting combustion device includes a protective cover 7, an ignition device 16, and an ejector premixing device 17. The ignition device 16 is disposed on one side of the upper part of the protective cover 7, and the front part of the ejector premixing device 17 is disposed in the lower inner cavity of the protective cover 7. The ignition device 16 includes: an ignition combustion ejector tube 8 that is connected through to the side of the protective cover 7, a high-energy igniter 9 disposed in the lower cavity of the ignition gas ejector tube 8, an ignition gas pipe 10 connected to the lower part of the high-energy igniter 9, and an ignition gas inlet pipe 11 connected to the lower part of the ignition gas pipe 10. The ejector premixing device 17 includes: a flame stabilizer 6 disposed in the lower inner cavity of the protective cover 7, an ejector premixing tube 5 connected to the lower part of the flame stabilizer 6, and a gas premixing assembly disposed at the lower part of the ejector premixing tube 5. An ejector combustion hole 18 is provided along the circumference of the upper part of the ignition gas ejector tube 8. The lower part of the high-energy igniter 9 is sleeved in the ignition gas pipe 10.
[0023] The tilt angle of the protective cover 7 corresponds to the tilt angle of the upper part of the ejector premix tube 5, and the tilt angle is 20-40°. An annular boss 12 is provided in the middle of the inner cavity of the flame stabilizer 6, and a through hole 15 is provided on the annular boss 12; an outwardly tapered opening 14 is provided at the outlet of the flame stabilizer 6. The lower side wall of the annular boss 12 forms an outwardly expanding tapered chamber; an annular groove 13 is provided on the upper side of the annular boss 12, and the through hole 15 extends from the annular groove 13 to the lower side wall of the annular boss 12. The ejector premixing tube 5 and the ignition device 16 are connected by a connector; the ejector premixing tube 5 includes a lower contraction section 5-1, a middle mixing section 5-2, and an upper diffuser section 5-3 connected to the flame stabilizer 6; the lower part of the contraction section 5-1 is a straight tube, and the upper part is an inwardly tapered tube; the contraction angle of the contraction section 5-1 is 15-30°; the ratio of the inlet area to the outlet area of the contraction section 5-1 is 2:1-3:1; the mixing section 5-2 is a straight tube; the ratio of the length of the mixing section 5-2 to its diameter is 3-8; the lower part of the diffuser section 5-3 is a straight tube, and the upper part is an outwardly expanding tapered tube.
[0024] The gas premixing assembly includes a main gas inlet pipe 1 connected to the lower part of the ejector premixing pipe 5 via a connector, a main gas nozzle 4 located at the head of the main gas inlet pipe 1, a locking nut 2 sleeved on the outside of the main gas inlet pipe 1, and a combustion air regulating disc 3 movably located on the upper part of the main gas inlet pipe 1 between the inlet of the ejector premixing pipe 5 and the locking nut 2.
[0025] The ratio of the inlet area of the ejector premixing pipe 5 to the outlet area of the main gas nozzle 4 is 150-200. The gas pressure in the main gas inlet pipe 1 is ≥50 kPa.
[0026] Because the combustion device needs to be vertically mounted for extended periods at high altitudes, it is significantly affected by rain and strong winds. Therefore, to prevent rainwater ingress, the diffuser section 5-3 of the ejector premix tube 5 is bent at a 20-40° angle, with a preferred bending angle of 30°. A protective cover 7 is added to its head, with the tilt angle of the protective cover 7 corresponding to the tilt angle of the diffuser section 5-3 of the ejector premix tube 5, set at 20-40°, with 30° being the preferred option. Simulating a 50m / s strong wind while simultaneously adding water spray to simulate rain, the ignition success rate is 100%, and stable combustion is achieved.
[0027] like Figure 1 As shown, a high-energy igniter 9 is arranged in the ignition gas pipe 10, along with an ignition gas ejector pipe 8. The ejector pipe 8 has evenly distributed perforations along its circumference. Through the ejection principle, the kinetic energy of the ignition gas is used to draw air in through the perforations, providing ignition air for the ignition gun. The circumferentially distributed perforations of the ignition gas ejector pipe 8 have a diameter of Φ7mm and an axial spacing of 30mm. There are 8 perforations evenly distributed along the circumference, with two rows of incomplete perforations at an angle, containing 3 and 5 perforations respectively, for a total of 40 ejector holes.
[0028] Because the main gas nozzle 4 has a relatively high outlet velocity, and the flame propagation speed is between 0.3-1.5 m / s, flameout is highly likely to occur under conditions of large velocity differences. To ensure stable combustion, a flame stabilizer 6 is added at the outlet of the injector premixing tube 5. Its main principle is to use an artificial ignition ring to stabilize the flame. Figure 2-3 As shown, the flame stabilizer 6 has external threads on its lower outer side and a through hole 15. When the mixture passes through the flame stabilizer 6, a small portion of the mixed gas is separated and passes through the through hole 15 into the annular space. Thus, during combustion, a stable flame is formed around the main airflow. This annular stable flame is a reliable ignition source for the main airflow and is not affected by airflow turbulence, does not increase the burner's heat load, and does not cause flame detachment. To ensure flame stability, the dimensions of the flame stabilizer 6 are as follows... Figure 3 As shown, the S value determines the area of the annular flame outlet, and the S value should be calculated with reference to the following formula.
[0029]
[0030] As a preferred embodiment, the diameter of the through holes is Φ2mm, the number of holes is 30, and they are evenly distributed along the circumference. The nozzle D is Φ43mm, and the S is 10mm.
[0031] like Figure 1As shown, the ejector premixing tube 5 is divided into three functional zones: a contraction section 5-1, a mixing section 5-2, and a diffusion section 5-3. The function of the contraction section 5-1 is to utilize the Venturi effect to convert the pressure energy of the high-pressure fluid into kinetic energy, forming a high-speed jet to provide power for the surrounding fluid. The contraction angle of the contraction section 5-1 is typically 15°-30°; an excessively steep angle will cause eddy current losses, while an excessively gentle angle will increase energy loss. The mixing section 5-2 is the straight pipe section after the outlet of the contraction section 5-1. It is the area where combustion air and fuel gas are fully mixed through turbulent diffusion. Its function is to stabilize the flow field and provide a uniform fluid for the subsequent combustion reaction. Similarly, the outlet area of the contraction section 5-1 should not be too small or too large. In this application, the ratio of the inlet area to the outlet area of the contraction section 5-1 is 2:1-3:1. The length of the mixing section 5-2 is a key parameter to ensure uniform mixing. To ensure uniform mixing, the length of the mixing section 5-2 is 3-8 times its diameter. As a preferred embodiment, the length of the mixing section 5-2 is 8 times the inner diameter of the bore. The inner diameter of the mixing section 5-2 is Φ52mm, and the length of the mixing section 5-2 is 416mm. The diffuser section 5-3 converts the kinetic energy of the mixed fluid back into pressure energy, improving the outlet pressure and stability, and reducing energy waste.
[0032] To ensure the gas velocity at the main gas nozzle 4 is as close as possible to the local speed of sound, a gas pressure of ≥50 kPa is required in the main gas inlet pipe 1. Simultaneously, to control the volume ratio of gas to injected air, a combustion air regulating disc 3 is installed. The amount of injected air is adjusted by moving this disc up and down to regulate the gap between the combustion air regulating disc 3 and the inlet of the ejector premixing pipe 5. For example... Figure 4 As shown, when the combustion air regulating disc 3 is close to the locking nut 2, it is at the maximum airflow position. Conversely, when it is away from the locking nut 2, the combustion air is fully shut off.
[0033] To balance the jet kinetic energy and air entrainment capacity, the ratio of the inlet area of the ejector premixing tube 5 to the area of the main gas nozzle 4 needs to be properly controlled. If the inlet area of the ejector premixing tube 5 is too large, the high-pressure fluid velocity decreases, the jet kinetic energy disperses, and the entrainment capacity weakens, making it difficult to effectively eject sufficient air. If the inlet area is too small, the high-pressure fluid velocity inside the tube is extremely high, the jet kinetic energy is concentrated, and the amount of air ejected may be excessive, leading to an overly lean premixed gas, reduced flame propagation speed, or even flameout. Therefore, the ratio of the inlet area of the ejector premixing tube 5 to the area of the main gas nozzle 4 is set to 150-200. As a preferred option, the nozzle diameter of the main gas nozzle 4 is 6mm. The inner diameter of the ejector premixing tube 5 is Φ81mm. The contraction angle of the contraction section 5-1 is 30°.
[0034] This invention utilizes the high pressure of natural gas. When the natural gas passes through the main gas nozzle 4, it forms a subsonic fluid, creating a low-pressure region around the nozzle 4. This pressure difference draws in surrounding low-pressure air, causing the natural gas and air to mix within the injector premixing tube 5, ultimately forming a homogeneous mixture of natural gas and air. Its advantages include the elimination of the need for additional fans or pumps to supply air; air intake and premixing are achieved solely through the pressure of the natural gas itself. It also features a simple structure, low cost, and provides homogeneous mixing and stable combustion.
Claims
1. An ejector-type premixed high-altitude venting combustion device, comprising a protective cover, an ignition device, and an ejector premixing device, characterized in that, The ignition device is located on one side of the upper part of the protective cover, and the front part of the ejector premixing device is located in the lower inner cavity of the protective cover. The ignition device includes: an ignition combustion ejector tube that is connected through the side of the protective cover, a high-energy igniter disposed in the lower chamber of the ignition gas ejector tube, an ignition gas pipe connected to the lower part of the high-energy igniter, and an ignition gas inlet pipe connected to the lower part of the ignition gas pipe. The ejector premixing device includes: a flame stabilizer disposed in the lower inner cavity of the protective cover, an ejector premixing tube connected to the lower part of the flame stabilizer, and a gas premixing component disposed at the lower part of the ejector premixing tube.
2. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The ignition gas ejector tube has an ejector combustion hole along its circumference at the top.
3. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The lower part of the high-energy igniter is fitted inside the ignition gas pipe.
4. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The tilt angle of the protective cover is set to correspond to the tilt angle of the upper part of the ejector premix tube, and the tilt angle is 20-40°.
5. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The flame stabilizer has an annular boss in the middle of its inner cavity, and a through hole is provided on the annular boss. The flame stabilizer outlet is provided with an outwardly tapered opening.
6. The ejector-type premixed high-altitude venting combustion device according to claim 5, characterized in that, The lower sidewall of the annular boss forms an outwardly expanding conical cavity; an annular groove is provided on the upper side of the annular boss, and a through hole extends from the annular groove to the lower sidewall of the annular boss.
7. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The ejector premix tube and the ignition device are connected by a connector; The ejector premix tube includes a lower contraction section, a middle mixing section, and an upper diffusion section connected to the flame stabilizer; The lower part of the contraction section is a straight tube, and the upper part is an inwardly tapered tube; the contraction angle of the contraction section is 15-30°; The ratio of the inlet area to the outlet area of the contraction section is 2:1 to 3:1; The mixing section is a straight pipe; the ratio of the length of the mixing section to its diameter is 3-8. The lower part of the diffuser section is a straight pipe, and the upper part is an outwardly expanding tapered pipe.
8. The ejector-type premixed high-altitude venting combustion device according to claim 1, characterized in that, The gas premixing assembly includes a main gas inlet pipe connected to the lower part of the ejector premixing pipe via a connector, a main gas nozzle disposed at the head of the main gas inlet pipe, a locking nut sleeved on the outside of the main gas inlet pipe, and a combustion air regulating disc movably disposed on the upper part of the main gas inlet pipe between the inlet of the ejector premixing pipe and the locking nut.
9. The ejector-type premixed high-altitude venting combustion device according to claim 8, characterized in that, The ratio of the inlet area of the ejector premixing tube to the outlet area of the main gas nozzle is 150-200.
10. The ejector-type premixed high-altitude venting combustion device according to claim 8, characterized in that, The gas pressure in the main gas inlet pipe is ≥50 kPa.