Composite low nitrogen burner

Abstract

The present invention discloses a composite low-nitrogen burner head, which includes a protective shell and a premixing tube. The premixing tube is arranged in the protective shell, a flame stabilizing tube is arranged inside the air outlet end of the premixing tube, one or more swirl plates are arranged outside the flame stabilizing tube, the flame stabilizing tube is installed inside the premixing tube through the swirl plates, a flame stabilizing disk is arranged at the air outlet end of the flame stabilizing tube, the flame stabilizing disk has a through hole, a metal corrugated plate is arranged at the air inlet end of the flame stabilizing tube, the metal corrugated plate is installed in the premixing tube, an air inlet pipe is arranged inside the air inlet end of the premixing tube, one or more mixing plates are arranged outside the air inlet pipe, and the air inlet pipe is installed inside the premixing tube through the mixing plates. Under the action of strong convection on both sides, a large amount of flue gas reflux will be formed in the internal combustion space of the burner head of the present invention, thereby reducing the oxygen concentration and thus reducing the emission of pollutants; the high-temperature flue gas processes part of the flue gas under the action of the three-way catalytic converter to further reduce harmful emissions such as NOx, CO, and HC.

Description

Technical Field

[0001] The invention discloses a combustion head, in particular to a composite low-nitrogen combustion head, belonging to the technical field of gas burners. Background Art

[0002] At present, horizontal heating furnaces are widely used in oil fields. After the gas burner used in conjunction with the horizontal heating furnace is in operation, the burning flame will sink and float due to the hot and cold gases. The side of the flame with a higher temperature is always above the entire fire tube. Long-term unbalanced burning of the fire tube will reduce the service life of the fire tube and easily burn the fire tube, causing safety accidents.

[0003] With the increasing prominence of environmental issues, especially the formulation of relevant gas fuel burner standards at home and abroad, and the implementation of nitrogen oxide control measures by government environmental protection departments, more and more low-nitrogen combustion technologies are also being applied to the field of combustion technology. Traditional burner heads are increasingly unable to meet the needs of low-nitrogen combustion. Summary of the invention

[0004] In view of the above-mentioned shortcomings that the combustion heads in the prior art cannot meet the requirements of low-nitrogen combustion, the present invention provides a composite low-nitrogen combustion head for a horizontal heating furnace gas burner, which can reduce the impact of the flame burning on the fire tube due to the sinking and floating of cold and hot gases, and a low-nitrogen combustion head that reduces pollutant emissions through a variety of composite technical measures.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a composite low-nitrogen combustion head, the combustion head includes a protective shell and a premixing tube, the premixing tube is arranged in the protective shell, a flame stabilizing tube is arranged inside the air outlet end of the premixing tube, one or more swirl plates are arranged outside the flame stabilizing tube, the flame stabilizing tube is installed inside the premixing tube through the swirl plates, a flame stabilizing disk is arranged at the air outlet end of the flame stabilizing tube, the flame stabilizing disk has a through hole, a metal corrugated plate is arranged at the air inlet end of the flame stabilizing tube, the metal corrugated plate is installed in the premixing tube, an air inlet pipe is arranged inside the air inlet end of the premixing tube, one or more mixing plates are arranged outside the air inlet pipe, and the air inlet pipe is installed inside the premixing tube through the mixing plates.

[0006] The technical solution adopted by the present invention to solve the technical problem further includes:

[0007] There are two premixing cylinders, which are arranged parallel to each other. The protective shell wraps the two premixing cylinders as a whole or wraps each premixing cylinder separately.

[0008] A terminal plate is fixedly installed at the front end of the protective shell. Two terminal through holes are arranged on the terminal plate. Each premixing cylinder is installed corresponding to one terminal through hole.

[0009] A mounting flange is fixedly arranged at the rear end of the protective shell, and the mounting flange is fixedly installed together with the protective shell.

[0010] A protective shell is arranged at the lower part of the mounting flange, the cross-section of the protective shell is semicircular, circular, elliptical or square, and a three-way catalytic converter is arranged inside the protective shell.

[0011] A smoke return pipe is arranged on the upper part of the installation flange, and two smoke return pipes are arranged in parallel.

[0012] The swirl plates are arranged obliquely relative to the flame stabilizing tube, and the inclination directions of the swirl plates outside the two flame stabilizing tubes are opposite. There are 4 to 36 swirl plates, and each swirl plate is evenly distributed in a ring shape outside the flame stabilizing tube.

[0013] The mixing sheet is arranged obliquely relative to the air intake pipe, and the inclination directions of the mixing sheets outside the two air intake pipes are opposite. There are 4 to 36 mixing sheets, and each mixing sheet is evenly distributed in a ring shape outside the air intake pipe. One end of the air intake pipe is the air inlet, and the other end is sealed. A gas outlet hole is opened on the air intake pipe.

[0014] The swirl plate is tilted relative to the flame stabilizing tube, the mixing plate is tilted relative to the air inlet pipe, and the tilt direction of the mixing plate is consistent with that of the swirl plate.

[0015] The front end of the premixing cylinder is circumferentially provided with ventilation holes, which are circular or square.

[0016] The beneficial effects of the present invention are as follows: the burner head of the present invention has a compact structure, and the flame can be deflected downward under the action of the positive and negative swirl sheets. This structure can adjust the fire type on the one hand, and reduce the flame from burning the fire tube due to the sinking and floating of cold and hot gases; under the action of strong convection on both sides, the internal combustion space of the burner head of the present invention will form a large amount of flue gas reflux to reduce the oxygen concentration and thus reduce pollutant emissions; the high-temperature flue gas is partially processed by the three-way catalytic converter to further reduce harmful emissions such as NOx, CO, and HC.

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the decomposed state of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure from another viewing angle of the present invention.

[0021] Figure 4 This is a schematic diagram of the decomposed state structure from another perspective of the present invention.

[0022] Figure 5It is a front view structural schematic diagram of the present invention.

[0023] Figure 6 for Figure 5 Schematic diagram of the AA cross-section structure.

[0024] Figure 7 for Figure 5 Schematic diagram of the BB cross-section structure.

[0025] Figure 8 for Figure 5 Schematic diagram of the CC cross-section structure.

[0026] In the figure, 1-protective shell, 2-premixing cylinder, 21-flame stabilizing cylinder, 22-swirl plate, 23-flame stabilizing disk, 24-inlet

[0027] Gas pipe, 25-mixing sheet, 26-metal corrugated plate, 27-vent, 28-gas outlet, 3-end plate, 4

[0028] Mounting flange, 41-mounting hole, 42-protective shell, 43-smoke return pipe. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] The terms "first", "second", "third", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0031] The following is a detailed description through specific embodiments.

[0032] Please refer to the attached Figure 1 To Attachment Figure 8 The present invention is a composite low-nitrogen burner head, which mainly includes

[0033] A protective shell 1 and a premixing cylinder 2, the premixing cylinder 2 is arranged in the protective shell 1, a flame stabilizing cylinder 21 is arranged inside the air outlet end of the premixing cylinder 2, one or more swirl sheets 22 are arranged outside the flame stabilizing cylinder 21, the flame stabilizing cylinder 21 is installed inside the premixing cylinder 2 through the swirl sheets 22, a flame stabilizing disk 23 is arranged at the air outlet end of the flame stabilizing cylinder 21, a metal corrugated plate 26 is arranged at the air inlet end of the flame stabilizing cylinder 21, the metal corrugated plate 26 is installed in the premixing cylinder 2, an air inlet pipe 24 is arranged inside the air inlet end of the premixing cylinder 2, one or more mixing sheets 25 are arranged outside the air inlet pipe 24, and the air inlet pipe 24 is installed inside the premixing cylinder 2 through the mixing sheets 25.

[0034] In this embodiment, the metal corrugated plate 26 is a circular flat plate structure formed by a metal belt with a corrugated width of 10 to 30 mm gradually winding from the center to the outside, the thickness of the metal belt is 0.1 to 0.5 mm, and the height of the crest and trough of the metal belt corrugation is 1 to 1.5 mm. The metal corrugated plate 26 is fixedly installed in the premixing cylinder 2 by sealant and is arranged close to one end of the swirl plate 22 to prevent tempering.

[0035] In this embodiment, there are two premixing tubes 2, which are arranged parallel to each other. The protective shell 1 isolates the premixed gas and the high-temperature protective shell 1 by wrapping the two premixing tubes 2 as a whole or wrapping each premixing tube 2 separately. An end plate 3 is fixedly installed at one end of the protective shell 1, and two end through holes are provided on the end plate 3. Each premixing tube 2 is installed corresponding to one end through hole. In the present invention, the end with the end plate 3 is defined as the front end, and the other end is the rear end. The rear end of the protective shell 1 is fixedly provided with a mounting flange 4, and the mounting flange 4 is fixedly installed with the protective shell 1. A hole with the same shape as the protective shell 1 is provided in the middle of the mounting flange 4. The protective shell 1 is inserted into the hole and welded with the mounting flange 4. A mounting hole 41 is provided on the mounting flange 4. The mounting hole 41 is provided at the edge of the mounting flange 4, which is used to install the present invention at a set position. In this embodiment, the shape of the mounting flange 4 can be circular, oval, square or rectangular, etc., and its shape is specifically selected according to actual needs.

[0036] In this embodiment, the swirl sheet 22 is arranged obliquely relative to the flame stabilizing tube 21, that is, the swirl sheet 22 is in a plane shape (or a plane shape similar to that of a fan blade), the plane where the swirl sheet 22 is located is at a certain angle to the cross section and the central axis of the flame stabilizing tube 21, and the structure of the swirl sheet 22 is similar to that of a fan blade, and the gas flowing through the swirl sheet 22 can produce a swirl effect. The swirl sheets 22 outside the two flame stabilizing tubes 21 are inclined in opposite directions, that is, the swirl sheets 22 outside the two flame stabilizing tubes 21 are arranged in opposite directions, one positive and one negative.

[0037] In this embodiment, 4 to 36 swirl plates 22 are provided, and each swirl plate 22 is evenly distributed in a ring shape outside the flame stabilizing tube 21 .

[0038] In this embodiment, the flame stabilizing disk 23 is arranged at the front end of the flame stabilizing tube 21. The flame stabilizing disk 23 has a through hole. The shape of the through hole can be a circular hole, a square hole, a long hole, a polygonal hole or a star-shaped hole.

[0039] In this embodiment, the mixing sheet 25 is arranged obliquely relative to the air inlet pipe 24, that is, the mixing sheet 25 is in a plane shape (or a plane shape similar to that of a fan blade), the plane where the mixing sheet 25 is located is at a certain angle to the cross section and the central axis of the air inlet pipe 24, and the structure of the mixing sheet 25 is similar to that of a fan blade, and the mixing sheet 25 can cause the gas flowing through to produce a swirl effect. The inclination directions of the mixing sheets 25 outside the two air inlet pipes 24 are opposite, that is, the mixing sheets 25 outside the two air inlet pipes 24 are arranged in reverse, one positive and one negative, for uniformly mixing the gas.

[0040] In this embodiment, 4 to 36 mixing sheets 25 are provided, and each mixing sheet 25 is evenly distributed in a ring shape outside the intake pipe 24 .

[0041] In this embodiment, one end of the air inlet pipe 24 is an air inlet and the other end is sealed. A gas outlet hole 28 is opened on the air inlet pipe 24 for the gas to be discharged from here. The gas outlet holes 28 are evenly arranged in multiple rows in the circumferential direction on the air inlet pipe 24. The shape of the gas outlet holes 28 can be a circular hole, a square hole, a long hole, a polygonal hole or a star-shaped hole, etc.

[0042] In this embodiment, the inclination direction of the mixing blades 25 in the same premixing cylinder 2 is consistent with the direction of the swirl blades 22 at their respective front ends.

[0043] In this embodiment, a vent hole 27 is circumferentially arranged at the front end of the premixing cylinder 2 to remove heat between the protective shell 1 and the premixing cylinder 2. Preferably, the vent hole 27 is circular or square.

[0044] In this embodiment, a protective shell 42 is provided at the lower part of the mounting flange 4. The cross-sectional shape of the protective shell 42 can be semicircular, circular, elliptical or square, preferably semicircular. A three-way catalytic converter 5 is provided inside the protective shell 42. The cross-sectional shape of the three-way catalytic converter 5 can be semicircular, circular, elliptical or square, preferably semicircular. The preferred shape of the three-way catalytic converter 5 matches the shape of the protective shell 42. The high-temperature flue gas is partially processed by the three-way catalytic converter to further reduce harmful emissions such as NOx, CO, and HC.

[0045] In this embodiment, a flue gas return pipe 43 is arranged on the upper part of the mounting flange 4, and an external induced draft fan is connected to the flue gas return pipe 43. The function of the flue gas return pipe 43 is to suck part of the flue gas treated by the three-way catalytic converter 5 through the flue gas return pipe 43 through the external induced draft fan and return it to the fire tube of the heating furnace. Two flue gas return pipes 43 are arranged, and the two flue gas return pipes 43 are arranged in parallel.

[0046] When the present invention is in use, the gas enters from the air inlet pipe 24. Since the other end of the air inlet pipe 24 is blocked, the gas entering the air inlet pipe 24 is discharged from the gas outlet 268. At the same time, air enters from the opening where the mounting flange 4 is connected to the protective shell 1, and forms a mixed gas through the mixing plate 25. The gas and air are evenly mixed in the premixing cylinder 2, and finally discharged through the through hole at the front end of the flame stabilizing disk 23. The gas is burned at the front end of the flame stabilizing disk 23, and the exhaust gas is discharged from the chimney of the heating furnace.

[0047] The composite low-nitrogen burner head protected by the present invention has a compact structure; both premixing tubes 2 are provided with an air inlet pipe 24 and a mixing sheet 25, which can promote more uniform mixing of the gas;

[0048] The composite low-nitrogen burner head protected by the present invention has a protective shell 1 that isolates the premixed gas from the high-temperature protective shell 1 by wrapping two premixing cylinders 2 as a whole or wrapping each premixing cylinder 2 separately, and reduces the temperature near the premixing cylinder 2 by air cooling.

[0049] The present invention can make the flame deflect downward and adjust the fire type under the action of the positive and negative swirl sheets 22, thereby reducing the flame from burning the fire tube due to the sinking and floating of the cold and hot gases; under the action of the strong convection on both sides, a large amount of flue gas reflux will be formed in the internal combustion space to reduce the oxygen concentration and thus reduce pollutant emissions; the high-temperature flue gas is partially processed by the three-way catalytic converter to further reduce harmful emissions such as NOx, CO, and HC.

[0050] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite low-nitrogen burner head, characterized by: The burner head comprises a protective shell (1) and a premixing tube (2), wherein the premixing tube (2) is arranged in the protective shell (1), a flame stabilizing tube (21) is arranged inside the gas outlet end of the premixing tube (2), one or more swirl plates (22) are arranged outside the flame stabilizing tube (21), the flame stabilizing tube (21) is installed inside the premixing tube (2) via the swirl plates (22), a flame stabilizing disk (23) is arranged at the gas outlet end of the flame stabilizing tube (21), the flame stabilizing disk (23) has a through hole, a metal corrugated plate (26) is arranged at the gas inlet end of the flame stabilizing tube (21), the metal corrugated plate (26) is installed in the premixing tube (2), and the premixing tube (2) is provided with a flame stabilizing disk (23). An air intake pipe (24) is provided inside the air intake end of the cylinder (2), and one or more mixing sheets (25) are provided outside the air intake pipe (24). The air intake pipe (24) is installed inside the premixing cylinder (2) through the mixing sheets (25); two premixing cylinders (2) are provided, and the two premixing cylinders (2) are arranged parallel to each other. The protective shell (1) wraps the two premixing cylinders (2) as a whole or wraps each premixing cylinder (2) separately; the swirl sheets (22) are arranged obliquely relative to the flame stabilizing cylinder (21), and the inclination directions of the swirl sheets (22) outside the two flame stabilizing cylinders (21) are opposite, and the swirl sheets (22) are provided with 4 to 36 The mixing sheets (25) are arranged in an inclined manner relative to the air inlet pipe (24), and the inclination directions of the mixing sheets (25) outside the two air inlet pipes (24) are opposite. There are 4 to 36 mixing sheets (25), and each mixing sheet (25) is evenly distributed in an annular manner outside the air inlet pipe (24). One end of the air inlet pipe (24) is an air inlet, and the other end is sealed. The air inlet pipe (24) is provided with a gas outlet hole (18); The inclination direction of the mixing plates (25) in the same premixing cylinder (2) is consistent with the direction of the swirl plates (22) at the front ends thereof.

2. The composite low nitrogen burner head according to claim 1, characterized in that: An end plate (3) is fixedly mounted on the front end of the protective housing (1), and two end through holes are formed on the end plate (3), and each premixing cylinder (2) is mounted corresponding to one end through hole.

3. The composite low nitrogen burner head according to claim 1, characterized in that: A mounting flange (4) is fixedly provided at the rear end of the protective shell (1), and the mounting flange (4) and the protective shell (1) are fixedly mounted together.

4. The composite low nitrogen burner head according to claim 3 is characterized in that: A protective shell (42) is arranged at the lower part of the mounting flange (4); the cross-sectional shape of the protective shell (42) is semicircular, circular, elliptical or square; a three-way catalytic converter (5) is arranged inside the protective shell (42).

5. The composite low nitrogen burner head according to claim 3 is characterized in that: A smoke return pipe (43) is arranged on the upper part of the mounting flange (4), and two smoke return pipes (43) are arranged, and the two smoke return pipes (43) are arranged in parallel.

6. The composite low nitrogen burner head according to claim 1 is characterized in that: A vent hole (27) is circumferentially arranged at the front end of the premixing cylinder (2), and the vent hole (27) is circular or square.

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