A double-head strong swirl low nitrogen burner

Abstract

The present invention discloses a double-headed strong swirl low-nitrogen burner head, the burner head comprises two premixing tubes arranged in parallel with each other, 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, the air inlet pipe is installed inside the premixing tube through the mixing plates, a flame stabilizing tube is arranged inside the air outlet end of the premixing tube, a swirl plate is arranged outside the flame stabilizing tube, the flame stabilizing tube is installed inside the premixing tube through the swirl plate, and a flame stabilizing disk is arranged at the air outlet end of the flame stabilizing tube. The burner head of the present invention has a compact structure, and the shape of the flame can be deflected downward under the action of the positive and negative swirl plates. 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; on the other hand, under the action of strong convection on both sides, a large amount of smoke reflux will be formed in the internal combustion space, thereby reducing harmful emissions such as NOx and CO.

Description

Technical Field

[0001] The invention discloses a combustion head, in particular to a double-head strong swirl 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 shortcoming that the burner heads in the prior art cannot meet the requirements of low-nitrogen combustion, the present invention provides a double-headed strong swirl low-nitrogen burner head, which can reduce the impact of the flame burning biased on the fire tube due to the sinking and floating of cold and hot gases.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a double-head strong swirl low-nitrogen burner, the burner head includes two premixing cylinders arranged parallel to each other, an air intake pipe is arranged inside the air intake end of the premixing cylinder, one or more mixing plates are arranged outside the air intake pipe, the air intake pipe is installed inside the premixing cylinder through the mixing plates, a flame stabilizing cylinder is arranged inside the air outlet end of the premixing cylinder, a swirl plate is arranged outside the flame stabilizing cylinder, the flame stabilizing cylinder is installed inside the premixing cylinder through the swirl plate, and a flame stabilizing disk is arranged at the air outlet end of the flame stabilizing cylinder.

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

[0007] A protective shell is arranged outside the premixing cylinder, and the protective shell wraps the two premixing cylinders as a whole or wraps each premixing cylinder separately.

[0008] An end plate is fixedly installed at one end of the protective shell, and two end through holes are provided on the end plate. Each premixing cylinder is installed corresponding to one end through hole. A mounting flange is fixedly provided at the other end of the protective shell. The mounting flange is fixedly installed together with the protective shell, and the mounting flange is circular, oval, square or rectangular.

[0009] The swirl sheets are arranged tilted relative to the flame stabilizing tube, and the tilting directions of the swirl sheets outside the two flame stabilizing tubes are opposite.

[0010] The swirl plates are provided with 4 to 36 pieces, and each swirl plate is evenly distributed in a ring shape outside the flame stabilizing tube.

[0011] The flame stabilizing disk is arranged at the front end of the flame stabilizing tube, and the flame stabilizing disk is provided with a through hole, and the shape of the through hole is a round hole, a square hole, a long hole, a polygonal hole or a star-shaped hole.

[0012] The mixing slices are arranged obliquely relative to the air intake pipe, and the inclination directions of the mixing slices outside the two air intake pipes are opposite; there are 4 to 36 mixing slices, and each mixing slice is evenly distributed in a ring shape outside the air intake pipe.

[0013] One end of the air inlet pipe is an air inlet, and the other end is sealed. A gas outlet hole is provided on the air inlet pipe.

[0014] The inclination direction of the mixing sheet in the same premixing cylinder is consistent with the direction of the swirl sheet at the front end.

[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, on the one hand, adjust the fire type and reduce the flame from burning the fire tube due to the sinking and floating of cold and hot gases; on the other hand, under the action of strong convection on both sides, a large amount of smoke reflux will be formed in the internal combustion space, thereby reducing harmful emissions such as NOx and CO.

[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 5 It 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] In the figure, 1-protective shell, 2-premixing cylinder, 21-flame stabilizing cylinder, 22-swirl plate, 23-flame stabilizing disk, 24-inlet pipe, 25-mixing plate, 26-gas outlet hole, 27-vent, 3-end plate, 4-mounting flange, 41-mounting hole. DETAILED DESCRIPTION

[0025] This embodiment is a preferred implementation mode of the present invention. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the present invention.

[0026] Please refer to the attached Figure 1 To Attachment Figure 6 The present invention is a double-head strong swirl low-nitrogen burner, which mainly includes two premixing tubes 2 arranged parallel to each other, an air intake pipe 24 is arranged inside the air intake end of the premixing tube 2, and one or more mixing plates 25 are arranged outside the air intake pipe 24. The air intake pipe 24 is installed inside the premixing tube 2 through the mixing plates 25. A flame stabilizing tube 21 is arranged inside the air outlet end of the premixing tube 2, and a swirl plate 22 is arranged outside the flame stabilizing tube 21. The flame stabilizing tube 21 is installed inside the premixing tube 2 through the swirl plate 22, and a flame stabilizing disk 23 is arranged at the air outlet end of the flame stabilizing tube 21.

[0027] In this embodiment, a protective shell 1 is provided on the outside of the premixing tube 2. 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. 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. The mounting flange 4 is fixedly installed together 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 to 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 for installing 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.

[0028] 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.

[0029] 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 .

[0030] 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.

[0031] 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.

[0032] 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 air inlet pipe 24. In this embodiment, 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 26 for gas to be discharged therefrom. The gas outlet holes 26 are evenly arranged in multiple rows in the circumferential direction on the air inlet pipe 24, and the shape of the gas outlet holes 26 can be a circular hole, a square hole, a long hole, a polygonal hole or a star-shaped hole, etc.

[0033] In this embodiment, the inclination direction of the mixing blades 25 in the same premixing tube 2 is consistent with the direction of the swirl blades 22 at their respective front ends.

[0034] 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.

[0035] 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 26. 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 sheet 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.

[0036] The double-head strong swirl low-nitrogen burner 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;

[0037] The double-head strong swirl low-nitrogen burner protected by the present invention has a protective shell 1 that isolates the premixed gas and the high-temperature protective shell 1 by wrapping two premixing cylinders 2 as a whole or individually wrapping each premixing cylinder 2, and reduces the temperature near the premixing cylinder 2 by air cooling.

[0038] 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 cold and hot gases; under the action of strong convection on both sides, a large amount of smoke reflux will be formed in the internal combustion space, thereby reducing harmful emissions such as NOx and CO.

[0039] 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 double-head strong swirl low nitrogen burner, characterized by: The combustion head comprises two premixing tubes (2) arranged parallel to each other, an air intake pipe (24) is arranged inside the air intake end of the premixing tube (2), one or more mixing plates (25) are arranged outside the air intake pipe (24), the air intake pipe (24) is installed inside the premixing tube (2) through the mixing plates (25), a flame stabilizing tube (21) is arranged inside the air outlet end of the premixing tube (2), a swirl plate (22) is arranged outside the flame stabilizing tube (21), the flame stabilizing tube (21) is installed inside the premixing tube (2) through the swirl plate (22), and a flame stabilizing disk (23) is arranged at the air outlet end of the flame stabilizing tube (21); The swirl sheets (22) are arranged obliquely relative to the flame stabilizing tube (21), and the inclination directions of the swirl sheets (22) outside the two flame stabilizing tubes (21) are opposite; The mixing plates (25) are arranged obliquely relative to the air intake pipe (24), and the mixing plates (25) outside the two air intake pipes (24) are inclined in opposite directions. There are 4 to 36 mixing plates (25), and the mixing plates (25) are evenly distributed in a ring shape outside the air intake pipe (24); One end of the air inlet pipe (24) is an air inlet, and the other end is sealed. A gas outlet hole (26) is provided on the air inlet pipe (24); The inclination direction of the mixing sheet (25) in the premixing barrel (2) is consistent with the direction of the swirl sheet (22) at the front end.

2. The double-head strong swirl low nitrogen burner according to claim 1 is characterized by: A protective shell (1) is arranged outside the premixing cylinder (2), and the protective shell (1) wraps the two premixing cylinders (2) as a whole or wraps each premixing cylinder (2) individually.

3. The double-head strong swirl low nitrogen burner according to claim 2 is characterized by: An end plate (3) is fixedly mounted on one end of the protective shell (1), and two end through holes are provided on the end plate (3). Each premixing cylinder (2) is installed in correspondence with one end through hole. A mounting flange (4) is fixedly mounted on the other end of the protective shell (1), and the mounting flange (4) is fixedly mounted together with the protective shell (1). The mounting flange (4) is circular, oval, square or rectangular.

4. The double-head strong swirl low nitrogen burner according to claim 1 is characterized by: The swirl plates (22) are provided in a number of 4 to 36, and the swirl plates (22) are evenly distributed in a ring shape outside the flame stabilizing tube (21).

5. The double-head strong swirl low nitrogen burner according to claim 1 is characterized by: The flame stabilizing disk (23) is arranged at the front end of the flame stabilizing tube (21), and the flame stabilizing disk (23) has a through hole, and the through hole is in the shape of a circular hole, a square hole, a long hole, a polygonal hole or a star-shaped hole.

6. The double-head strong swirl low nitrogen burner according to claim 1 is characterized by: 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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