A burner

Abstract

The application discloses a burner, which comprises a main pipe, an air inlet end and an air outlet end arranged at two ends of the main pipe respectively, a first plugging plate fixedly arranged on the air outlet end, a first spray hole arranged on the first plugging plate, a plurality of outer branch pipes fixedly arranged on the outer side wall of the main pipe and inclined towards the air outlet end, an inner branch pipe coaxially arranged in the outer branch pipe, one end of the inner branch pipe fixedly arranged on the outer side wall of the main pipe and communicated with the inner cavity of the main pipe, a second plugging plate fixedly arranged on the other end of the inner branch pipe, a plurality of second spray holes arranged on the pipe wall of the outer branch pipe close to the air outlet end of the main pipe, a plurality of third spray holes arranged on the pipe wall of the inner branch pipe, the third spray holes and the second spray holes arranged in one-to-one correspondence, and a Laval nozzle fixedly connected between the third spray hole and the corresponding second spray hole. The purpose is to provide a burner, which can strengthen the uniform and rapid mixing of gas injection and combustion air, ensure complete combustion of natural gas, and realize the effects of reducing the flame length and reducing black smoke.

Description

Technical Field

[0001] This invention belongs to the field of energy saving and environmental protection technology of natural gas combustion process in urban gas operations, and specifically relates to a burner. Background Technology

[0002] In recent years, with the vigorous promotion of natural gas, issues related to natural gas venting, emissions, combustion processes, and their impacts have also arisen. Therefore, it is necessary to study and improve these issues to achieve better combustion and venting effects.

[0003] Natural gas is a mixture of hydrocarbons, consisting of 95% methane, 2.5% ethane, 0.2% propane, 0.06% butane, and 0.02% certain higher alkanes (C5H4O). 12 +C 10 H 22 Natural gas consists of 1.6% nitrogen (N2), 0.7% carbon dioxide (CO2), trace amounts of hydrogen sulfide (H2S), water (H2O), and other trace gaseous impurities and non-flammable components. As a substance containing many carbon elements, its direct emission would significantly increase the global warming potential of the greenhouse effect. For these reasons, it is necessary to vent natural gas during urban gas operations to reduce environmental pollution. Existing conventional burners, which directly ignite and vent natural gas, produce large amounts of black smoke, impacting the residential environment and no longer meeting practical needs. Therefore, existing burners need to be improved to reduce the flame length during ignition and venting, effectively controlling black smoke generation and reducing noise pollution.

[0004] Therefore, it is meaningful to develop an energy-saving and environmentally friendly burner that can ensure a low flame length and reduce black smoke production, and it is even more urgent for urban air venting systems. Summary of the Invention

[0005] The purpose of this invention is to improve upon the shortcomings and problems existing in the prior art by providing a burner that ensures complete combustion of natural gas by enhancing the uniform and rapid mixing of gas injection and combustion air, thereby reducing flame length and black smoke.

[0006] The present invention discloses a burner comprising a main pipe with an inlet and an outlet at its two ends. A first sealing plate is fixedly mounted on the outlet, and a first nozzle is provided on the first sealing plate. A plurality of outer branch pipes are fixedly mounted on the outer wall of the main pipe, and the outer branch pipes are arranged obliquely toward the outlet of the main pipe. An inner branch pipe is coaxially arranged inside the outer branch pipe, one end of which is fixedly mounted on the outer wall of the main pipe and communicates with the inner cavity of the main pipe. A second sealing plate is fixedly mounted on the other end of the inner branch pipe. A plurality of second nozzles are provided on the pipe wall of the outer branch pipe near the outlet of the main pipe, and the plurality of second nozzles are arranged at intervals along the axial direction of the outer branch pipe. A plurality of third nozzles are provided on the pipe wall of the inner branch pipe, and the plurality of third nozzles are arranged in a one-to-one correspondence with the plurality of second nozzles. A Laval nozzle is fixedly connected between the third nozzle and the corresponding second nozzle.

[0007] In the burner of the present invention, a baffle is provided in the inner branch pipe along the axial direction for sliding sealing. The baffle is fixedly connected to one end of a screw. The other end of the screw passes through a second sealing plate along the axial direction of the inner branch pipe. A nut is rotatably installed at the end of the outer branch pipe away from the main pipe. The other end of the screw is threadedly connected to the nut.

[0008] The burner of the present invention has an axially arranged sliding groove on the inner wall of the inner branch pipe, and a slider that cooperates with the sliding groove is fixed on the baffle plate, the slider being located inside the sliding groove.

[0009] The burner of the present invention has an axially arranged slider fixed on the inner wall of the inner branch pipe, and a groove for cooperating with the slider is provided on the baffle plate, with the slider located in the groove.

[0010] In the burner of the present invention, a third sealing plate is fixedly provided at the end of the outer branch pipe away from the main pipe. The third sealing plate is provided with a first through hole, and the nut is provided in the first through hole. The nut and the first through hole are clearance fit. The nut is rotatably mounted on the inner wall of the outer branch pipe through a bearing. The other end of the screw passes through the second sealing plate and is threadedly connected to the nut.

[0011] The present invention provides a burner in which a plurality of said outer branch pipes are arranged at uniform intervals along the outer side wall of the main pipe.

[0012] The burner of the present invention further includes a cylindrical flame stabilizer, wherein the main pipe and the outer branch pipe are both located inside the flame stabilizer, and a gap is left between the outer branch pipe and the inner wall of the flame stabilizer. The flame stabilizer is provided with a plurality of circumferentially arranged second through holes.

[0013] The burner of the present invention, wherein the second through hole is circular, elliptical, polygonal or other irregular shape.

[0014] In the burner of the present invention, the second through hole is a strip-shaped through hole, the strip-shaped through hole is arranged along the axial direction of the flame stabilizer, and a plurality of strip-shaped baffles are arranged at intervals inside the strip-shaped through hole. The strip-shaped baffles are arranged along the axial direction of the flame stabilizer, and a ventilation gap is formed between two adjacent strip-shaped baffles. The ventilation gap is arranged along the tangential direction of the inner wall of the flame stabilizer.

[0015] The burner of this invention differs from the prior art in that, during use, natural gas enters from the inlet end of the main pipe, then a portion of the natural gas is ejected and burned from the first nozzle of the main pipe, while the remaining natural gas enters the inner branch pipe and is then ejected and burned sequentially through the third nozzle, the Laval nozzle, and the second nozzle. Because the outer branch pipes are arranged at an angle towards the outlet end of the main pipe, i.e., the outer branch pipes are arranged close to the outlet end of the main pipe, the flames ejected from the main pipe are surrounded by the flames ejected from multiple outer branch pipes, forming a concentrated spray pattern, which effectively reduces the length of the flame and makes the combustion more uniform and complete. In addition, a Laval nozzle is fixedly connected between the third nozzle of the inner branch pipe and the second nozzle of the outer branch pipe. When natural gas is injected from the outer branch pipe for combustion, it first enters the Laval nozzle through the third nozzle of the inner branch pipe, then passes sequentially through the front compression section, the middle throat, and the rear expansion section of the Laval nozzle before being ejected and burned through the second nozzle of the outer branch pipe. The continuous changes in cross-sectional contraction, contraction peak, and expansion caused by the combined action of the front compression section, middle throat, and rear expansion section of the Laval nozzle create continuous changes in the pressure of the combustion air and gas. This continuous change in the flow cross-section and fluid pressure enables rapid and uniform mixing and combustion of natural gas and combustion air. The Laval nozzle also reduces the ejection velocity of natural gas, thereby reducing the flame length. Therefore, this invention can ensure complete combustion of natural gas and achieve the effects of reducing flame length and black smoke by enhancing the uniform and rapid mixing of gas injection and combustion air.

[0016] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a front view of a burner embodiment of the present invention;

[0018] Figure 2 This is a front sectional view of a first embodiment of the burner of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the outer branch pipe in Embodiment 1 of the burner of the present invention;

[0020] Figure 4 For along Figure 3 Sectional view of line AA in the middle;

[0021] Figure 5This is a top view of a first embodiment of the burner of the present invention;

[0022] Figure 6 This is a top view of Embodiment 2 of the burner of the present invention;

[0023] Figure 7 For along Figure 6 Sectional view of the middle BB line;

[0024] Figure 8 This is a front sectional view of Embodiment 3 of the burner of the present invention;

[0025] Figure 9 For along Figure 8 A cross-sectional view of the CC line. Detailed Implementation

[0026] Example 1

[0027] like Figure 1 As shown, and in combination Figure 2-5 As shown, the burner of the present invention includes a main pipe 4, with an air inlet and an air outlet at its two ends. A first sealing plate 9 is fixedly provided on the air outlet, and a first nozzle 10 is provided on the first sealing plate 9. A plurality of outer branch pipes 3 are fixedly provided on the outer wall of the main pipe 4, and the outer branch pipes 3 are arranged obliquely toward the air outlet of the main pipe 4. An inner branch pipe 13 is arranged coaxially inside the outer branch pipe 3. One end of the inner branch pipe 13 is fixedly provided on the outer wall of the main pipe 4 and communicates with the inner cavity of the main pipe 4. A second sealing plate 5 is fixedly provided on the other end of the inner branch pipe 13. A plurality of second nozzles 7 are provided on the pipe wall of the outer branch pipe 3 near the air outlet of the main pipe 4. The plurality of second nozzles 7 are evenly spaced along the axial direction of the outer branch pipe 3. A plurality of third nozzles 6 are provided on the pipe wall of the inner branch pipe 13. The plurality of third nozzles 6 are arranged in a one-to-one correspondence with the plurality of second nozzles 7. A Laval nozzle 8 is fixedly connected between the third nozzle 6 and the corresponding second nozzle 7.

[0028] like Figure 5 As shown, multiple outer branch pipes 3 are evenly spaced along the outer side wall of the main pipe 4. In this embodiment, the number of outer branch pipes 3 is set to four, but of course, other numbers can also be used.

[0029] like Figure 1 , 2 As shown, the outlet end of the main pipe 4 is arranged upwards, and the outer branch pipe 3 is arranged inclined upwards, thus achieving the above-mentioned arrangement of the outer branch pipe 3 inclined towards the outlet end of the main pipe 4.

[0030] like Figure 2 As shown, the main pipe 4 has a vent hole 11 on its wall that corresponds to the inner branch pipe 13. The inner branch pipe 13 and the inner cavity of the main pipe 4 are connected through the vent hole 11.

[0031] like Figure 2 , 3 As shown, since multiple second nozzles 7 are evenly spaced along the axial direction of the outer branch pipe 3, and the third nozzles 6 are arranged in a one-to-one correspondence with the second nozzles 7, multiple third nozzles 6 are also evenly spaced along the axial direction of the inner branch pipe 13.

[0032] The Laval nozzle 8 is existing technology, which includes a front compression section, a middle throat and a rear expansion section. The working principle of the Laval nozzle 8 will not be elaborated here.

[0033] like Figure 2-4 As shown, in the burner of the present invention, a baffle 12 is provided in the inner branch pipe 13 along the axial direction for sliding sealing. The baffle 12 is fixedly connected to one end of a screw 1. The other end of the screw 1 passes through a second sealing plate 5 along the axial direction of the inner branch pipe 13. A nut 2 is rotatably installed at the end of the outer branch pipe 3 away from the main pipe 4. The other end of the screw 1 is threadedly connected to the nut 2.

[0034] like Figure 4 As shown, in the burner of the present invention, the inner wall of the inner branch pipe 13 is provided with an axially arranged sliding groove, and the baffle 12 is fixedly provided with a slider 16 that cooperates with the sliding groove, the slider 16 being located within the sliding groove. The slider 16 and the sliding groove are adapted to each other in shape, and under the action of the slider 16 and the sliding groove, the baffle 12 can be slidably and sealingly disposed within the inner branch pipe 13. Of course, the positions of the slider 16 and the sliding groove can also be interchanged, that is, the inner wall of the inner branch pipe 13 is fixedly provided with an axially arranged slider 16, the baffle 12 is provided with a sliding groove that cooperates with the slider 16, and the slider 16 is located within the sliding groove.

[0035] like Figure 1-3 As shown in Figure 5, in the burner of the present invention, a third sealing plate 15 is fixedly provided at the end of the outer branch pipe 3 away from the main pipe 4. The third sealing plate 15 is provided with a first through hole, and the nut 2 is provided in the first through hole. The nut 2 and the first through hole are clearance fit. The nut 2 is rotatably mounted on the inner wall of the outer branch pipe 3 through a bearing 14 (of course, the bearing 14 is located inside the outer branch pipe 3). The other end of the screw 1 passes through the second sealing plate 5 and is threadedly connected to the nut 2.

[0036] like Figure 2 , 3 As shown, when the nut 2 is rotated, since the screw 1 is fixedly connected to the baffle 12 and the baffle 12 is axially slidably sealed inside the inner branch pipe 13, the screw 1 and the baffle 12 will not rotate with the nut 2, but will only slide along the axial direction of the inner branch pipe 13.

[0037] The natural gas flows from the main pipe 4 into the inner branch pipe 13, and then exits the outer branch pipe 3 through the third nozzle 6 between the baffle 12 and the main pipe 4, the Laval nozzle 8, and the second nozzle 7. Based on this, when the nut 2 is rotated to allow the baffle 12 to slide away from the main pipe 4 along the axial direction of the inner branch pipe 13, the number of third nozzles 6 between the baffle 12 and the main pipe 4 increases, thus increasing the number of natural gas ejected through the third nozzles 6. Conversely, when the nut 2 is rotated in the opposite direction to allow the baffle 12 to slide closer to the main pipe 4 along the axial direction of the inner branch pipe 13, the number of third nozzles 6 between the baffle 12 and the main pipe 4 decreases, thus reducing the number of natural gas ejected through the third nozzles 6.

[0038] The hole formed by the third nozzle 6, the Laval nozzle 8, and the second nozzle 7 is called the vent hole 17. In summary, when the baffle 12 slides along the inner branch pipe 13 closer to the main pipe 4, the third nozzle 6 on the inner branch pipe 13 gradually closes from the far side to the near side of the main pipe 4 (closing the third nozzle 6 also means closing the vent hole 17), thus reducing the number of vent holes 17 available for natural gas ejection. Conversely, when the baffle 12 slides along the inner branch pipe 13 away from the main pipe 4, the third nozzle 6 on the inner branch pipe 13 gradually opens from the near side to the far side of the main pipe 4 (opening the third nozzle 6 also means opening the vent hole 17), thus increasing the number of vent holes 17 available for natural gas ejection. In this way, the number of open vent holes 17 can be adjusted according to the actual ejection volume.

[0039] like Figure 5 As shown, the vent holes 17 on the four outer branch pipes 3 are arranged in an array, which makes the combustion of natural gas more uniform.

[0040] The burner of this invention differs from the prior art in that, during use, natural gas enters from the inlet end of the main pipe 4. A portion of the natural gas is then ejected and burned through the first nozzle 10 of the main pipe 4, while the remaining natural gas enters the inner branch pipe 13. It then sequentially passes through the third nozzle 6, the Laval nozzle 8, and the second nozzle 7 before being ejected and burned. Because the outer branch pipe 3 is arranged at an angle towards the outlet end of the main pipe 4, i.e., the outer branch pipe 3 is arranged close to the outlet end of the main pipe 4, the flames ejected from the main pipe 4 are enveloped by the flames ejected from multiple outer branch pipes 3, forming a concentrated spray pattern. This effectively reduces the flame length, resulting in more uniform and complete combustion. In addition, a Laval nozzle 8 is fixedly connected between the third nozzle 6 of the inner branch pipe 13 and the second nozzle 7 of the outer branch pipe 3. Thus, when natural gas is injected from the outer branch pipe 3 for combustion, it first enters the Laval nozzle 8 through the third nozzle 6 of the inner branch pipe 13, then passes sequentially through the front compression section, the middle throat, and the rear expansion section of the Laval nozzle 8 before being ejected and burned through the second nozzle 7 of the outer branch pipe 3. The continuous changes in cross-sectional contraction, contraction peak, and expansion caused by the combined action of the front compression section, the middle throat, and the rear expansion section of the Laval nozzle 8 create continuous changes in the pressure of the combustion air and the gas. This continuous change in the flow cross-section and fluid pressure enables rapid and uniform mixing and combustion of natural gas and combustion air. The Laval nozzle 8 also reduces the ejection velocity of natural gas, thereby reducing the flame length. Therefore, this invention can ensure complete combustion of natural gas and achieve the effects of reducing flame length and black smoke by enhancing the uniform and rapid mixing of gas injection and combustion air.

[0041] This invention is designed based on the principles of injection enhancement and concentrated combustion, and is suitable for treating a suitable amount of natural gas emissions from urban gas supply. Concentrated combustion can reduce flame height, meeting the requirements of high efficiency, energy saving and environmental protection.

[0042] In this invention, natural gas first enters the main pipe 4, and then flows from the main pipe 4 into different inner branch pipes 13. This divides the natural gas into several streams entering different channels, slowing down the large-flow emission rate. The main pipe 4 has only one first nozzle 10, and four circumferentially distributed outer branch pipes 3 have multiple vent holes 17 evenly arranged on them. These four outer branch pipes 3 converge near the center of the main pipe 4, ensuring that the gas flame fully contacts and mixes with the combustion air when ejected, while also effectively reducing the length of the directly ejected flame.

[0043] The beneficial effects of this invention are as follows:

[0044] (1) The outer branch pipe 3 of the present invention is arranged close to the center of the main pipe 4, which realizes the rapid and uniform mixing of natural gas and combustion air and reduces the height of the flame; the vent holes 17 on the outer branch pipe 3 are arranged in an array, realizing the array injection of natural gas; the vent holes 17 are provided with Laval nozzles 8, and under normal operating conditions, natural gas and air are mixed in a stronger manner through the front conical part and throat of the Laval nozzle 8.

[0045] (2) In this invention, the natural gas flow from the vent holes 17 on the four outer supports and the natural gas flow from the first nozzle 10 on the main pipe 4 will cross each other, thereby enhancing the mixing between the gas flows.

[0046] (3) In this invention, the flame ejected from the main pipe 4 is surrounded by the flame ejected from the four outer branch pipes 3, forming a concentrated spray pattern, which effectively reduces the length of the flame and makes the combustion more uniform and complete.

[0047] (4) The Laval nozzle 8 in this invention is formed by the continuous changes in the cross-sectional contraction, contraction peak and expansion of the front compression section, the middle throat and the rear expansion section, which in turn creates a continuous change in the pressure of combustion air and natural gas. This continuous change in the flow cross section and fluid pressure can realize the rapid and uniform mixing and combustion of natural gas and combustion air.

[0048] Example 2

[0049] The difference between this embodiment and Embodiment 1 is the addition of a flame stabilizer 18, specifically as follows: Figure 6 , 7 As shown, the burner of the present invention further includes a cylindrical flame stabilizer 18. The main pipe 4 and the outer branch pipe 3 are both located within the flame stabilizer 18. A gap is left between the outer branch pipe 3 and the inner wall of the flame stabilizer 18. The flame stabilizer 18 is provided with a plurality of circumferentially evenly arranged second through holes 19. The second through holes 19 are circular, elliptical, polygonal, or other irregular shapes. The second through holes 19 allow outside air to be introduced into the flame stabilizer 18 to aid combustion of natural gas.

[0050] The flame stabilizer 18 can prevent the flame from jumping back and forth and can also conceal the flame. In addition, the flame stabilizer 18 can also guide heat to higher places to avoid excessive radiant heat in the lower places where the staff are located, thus protecting the staff.

[0051] Example 3

[0052] The difference between this embodiment and Embodiment 2 lies in the structure of the second through hole 19, specifically: Figure 8 , 9As shown, in the burner of the present invention, the second through hole 19 is a strip-shaped through hole, which is arranged along the axial direction of the flame stabilizer 18. The strip-shaped through hole is provided with a plurality of spaced and parallel strip-shaped baffles 20, which are arranged along the axial direction of the flame stabilizer 18. A ventilation gap 21 is formed between two adjacent strip-shaped baffles 20, which is arranged along the tangential direction of the inner wall of the flame stabilizer 18.

[0053] In this way, after the air enters the flame stabilizer 18 through the ventilation gap 21 of the second through hole 19, it will rotate along the inner wall of the flame stabilizer 18, thereby enhancing the mixing of air and natural gas and making the natural gas burn more completely.

[0054] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", 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 the present 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 the present invention.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A burner, characterized in that: The system includes a main pipe with an inlet and an outlet at its two ends. A first sealing plate with a first nozzle is fixedly mounted on the outlet. Multiple outer branch pipes are fixedly mounted on the outer wall of the main pipe, inclined towards the outlet. An inner branch pipe is coaxially arranged within each outer branch pipe, with one end fixed to the outer wall and communicating with the inner cavity of the main pipe, and the other end fixed with a second sealing plate. Multiple second nozzles are located on the wall of the outer branch pipe near the outlet, spaced axially along the outer branch pipe. Multiple third nozzles are located on the wall of the inner branch pipe, corresponding one-to-one with the second nozzles. A Laval nozzle is fixedly connected between each third nozzle and its corresponding second nozzle. The inner branch pipe is provided with a baffle that slides axially inside. The baffle is fixedly connected to one end of a screw. The other end of the screw passes through a second sealing plate along the axial direction of the inner branch pipe. A nut is rotatably installed on the end of the outer branch pipe away from the main pipe. The other end of the screw is threadedly connected to the nut.

2. The burner according to claim 1, characterized in that: The inner wall of the inner branch pipe is provided with an axially arranged sliding groove, and a slider that cooperates with the sliding groove is fixed on the baffle plate. The slider is located in the sliding groove.

3. The burner according to claim 1, characterized in that: An axially arranged slider is fixed on the inner wall of the inner branch pipe, and a groove is provided on the baffle plate to cooperate with the slider, with the slider located in the groove.

4. The burner according to claim 2 or 3, characterized in that: A third sealing plate is fixedly provided at the end of the outer branch pipe away from the main pipe. The third sealing plate has a first through hole, and the nut is provided in the first through hole. The nut and the first through hole are clearance fit. The nut is rotatably installed on the inner wall of the outer branch pipe through a bearing. The other end of the screw passes through the second sealing plate and is threadedly connected to the nut.

5. The burner according to claim 4, characterized in that: Multiple external branch pipes are evenly spaced along the outer side wall of the main pipe.

6. The burner according to claim 5, characterized in that: It also includes a cylindrical flame stabilizer, with the main pipe and the outer branch pipe both located inside the flame stabilizer. A gap is left between the outer branch pipe and the inner wall of the flame stabilizer, and the flame stabilizer is provided with a plurality of circumferentially arranged second through holes.

7. The burner according to claim 6, characterized in that: The second through hole is circular, elliptical, or polygonal.

8. The burner according to claim 6, characterized in that: The second through hole is a strip-shaped through hole, which is arranged along the axial direction of the flame stabilizer. Multiple strip-shaped baffles are arranged at intervals inside the strip-shaped through hole. The strip-shaped baffles are arranged along the axial direction of the flame stabilizer, and a ventilation gap is formed between two adjacent strip-shaped baffles. The ventilation gap is arranged along the tangential direction of the inner wall of the flame stabilizer.

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