Multi-channel oxygen-enriched burner

Abstract

The application provides a multi-channel oxygen-rich burner, and belongs to the technical field of burner adjusting devices.The multi-channel oxygen-rich burner comprises a gas pipe, a first oxygen inlet pipe, a second oxygen inlet pipe, a contraction pipe, a throat pipe, a first expansion pipe, a second expansion pipe, a wind pipe, a cyclone wind pipe and a coal wind pipe.The first oxygen inlet pipe is arranged outside the gas pipe, the cyclone wind pipe is arranged outside the first oxygen inlet pipe, the coal wind pipe is arranged outside the cyclone wind pipe, the second oxygen inlet pipe is arranged outside the coal wind pipe, and the wind pipe is arranged on the outer side wall of the second oxygen inlet pipe.The end of the gas pipe is connected with the contraction pipe, the end of the contraction pipe is provided with the throat pipe, the end of the throat pipe is provided with the first expansion pipe, and the end of the first expansion pipe is provided with the second expansion pipe.The first expansion pipe and the second expansion pipe are used for mixing, the mixing effect is improved, the combustion turbulence is increased, the lifting effect is remarkable, and the harmful nitrogen oxide residue is significantly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of burner regulating devices, and in particular to a multi-channel oxygen-enriched burner. Background Art

[0002] A burner that uses oxygen-enriched air for combustion is called an oxygen-enriched burner. Oxygen-enriched combustion refers to combustion using oxygen-enriched air with a higher oxygen concentration than normal air (21% oxygen). It is a highly efficient and energy-saving combustion technology that is used in the glass industry, metallurgical industry, and thermal engineering fields.

[0003] Generally, oxygen-enriched combustion seems to increase the oxygen content in the air to about 35%;

[0004] The existing application number is 202122151563.9, which is a six-channel burner adjustment device, including a gas pipe, an outer axial air duct connected to the gas pipe, an outer axial air valve provided on the outer axial air duct, an inner axial air duct provided between the gas pipe and the outer axial air duct, an inner axial air valve provided on the inner axial air duct, a swirl air duct provided between the gas pipe and the outer axial air duct, a swirl air valve provided on the swirl air duct, a central air duct provided between the gas pipe and the outer axial air duct, a central air valve provided on the central air duct, a coal-air interface provided in the gas pipe, and a gas interface provided at the bottom of the gas pipe. The six-channel burner adjustment device described in the utility model can adjust the flame shape in a variety of ways, thereby fully meeting people's needs for flame shape under various working conditions.

[0005] High-speed jets and swirl air ducts are used to lengthen the flame and improve the uniformity of the temperature field distribution. This technology can also reduce the temperature at the burner end, but it will still produce harmful nitrogen oxides, and its mixing effect needs further improvement. Summary of the Invention

[0006] In view of this, the present invention provides a multi-channel oxygen-enriched burner, which uses a first expansion tube and a second expansion tube for multiple mixing, thereby enhancing the mixing effect and increasing the combustion turbulence. The improvement effect is significant and the residual harmful nitrogen oxides are significantly reduced.

[0007] In order to solve the above technical problems, the present invention provides a multi-channel oxygen-enriched burner, comprising a gas pipe, a first oxygen inlet pipe, a second oxygen inlet pipe, a contraction pipe, a throat pipe, a first expansion pipe, a second expansion pipe, an air bundle pipe, a swirl air pipe, and a coal air pipe;

[0008] A first oxygen inlet pipe is provided outside the gas pipe, a swirl air duct is provided outside the first oxygen inlet pipe, a coal air duct is provided outside the swirl air duct, a second oxygen inlet pipe is provided outside the coal air duct, and an air bundle pipe is provided on the outer side wall of the second oxygen inlet pipe;

[0009] The end of the gas pipe is connected to the contraction tube, the end of the contraction tube is provided with a throat tube, the end of the throat tube is provided with a first expansion tube, and the end of the first expansion tube is provided with a second expansion tube.

[0010] After the present invention adopts the above structure, after the gas pipe is ventilated, the external first oxygen inlet pipe contacts the gas for the first time, and then contacts and mixes at high speed, and generates turbulence under the mixing of the swirling wind, in preparation for the subsequent mixing. A coal air duct is set outside the swirling air duct to mix the fuel, so that mixing is generated under the action of the swirling wind, and then oxygen is supplemented by the external second oxygen inlet pipe. This step of oxygenation makes the combustion more complete, and under the action of the high-speed airflow of the external bundle air duct, a high-speed jet is generated, which throws the combustion turbulence away, and then diffuses in a larger space for complete combustion.

[0011] As a further improvement of the present invention, in order to achieve multiple mixing, oxygen and fuel gas are mixed, the first oxygen inlet pipe is connected to the outer wall of the first expansion pipe, the swirl air duct is connected to the connection between the first expansion pipe and the second expansion pipe, and the coal air duct and the second oxygen inlet pipe are connected to the second expansion pipe.

[0012] As a further improvement of the present invention, in order to allow the oxygen-rich fuel to be expanded and scattered in a sufficiently large space and then fully burned, the air bundle pipe is located on the outer side wall of the second expansion pipe.

[0013] As a further improvement of the present invention, in order to produce a stronger binding effect so that the fuel mixed with oxygen is ejected farther, an arc-shaped block is provided on the inner wall of the air bundle tube near the second expansion tube, and the thickness of the arc-shaped block decreases successively from the end of the air bundle tube to the inside of the air bundle tube.

[0014] As a further improvement of the present invention, in order to achieve a better mixing effect, the first expansion tube allows the fuel gas and oxygen to be initially mixed, and then fully mixed at the second expansion tube. The angle between the inner side wall of the first expansion tube and the central axis is 15°~20°, and the angle between the inner side wall of the second expansion tube and the central axis is 45°~55°.

[0015] As a further improvement of the present invention, in order to achieve the effect of one tube within another outside the gas pipe for ventilation and mixing, the tail end of the first oxygen inlet pipe is connected to the gas pipe through a first connecting flange, the tail end of the swirl air duct is connected to the first oxygen inlet pipe through a second connecting flange, the tail end of the coal air duct is connected to the swirl air duct through a third connecting flange, the tail end of the second oxygen inlet pipe is connected to the coal air duct through a fourth connecting flange, and the tail end of the bundled air duct is connected to the second oxygen inlet pipe through a fifth connecting flange.

[0016] As a further improvement of the present application, in order to facilitate the adjustment of the air pressure of each air pipe, the first oxygen inlet pipe and the second oxygen inlet pipe are connected to the oxygen main pipe, and the cyclone air pipe and the beam air pipe are connected to the total air pipe.

[0017] As a further improvement of the present application, in order to facilitate the adjustment of the air pressure of each air pipe, the first oxygen inlet pipe and the second oxygen inlet pipe are connected to the oxygen main pipe, and the cyclone air pipe and the beam air pipe are connected to the total air pipe.

[0018] As a further improvement of the present application, in order to facilitate the adjustment of the air pressure of each air pipe, the first oxygen inlet pipe and the second oxygen inlet pipe are connected to the oxygen main pipe, and the cyclone air pipe and the beam air pipe are connected to the total air pipe.

[0019] As a further improvement of the present application, in order to realize more sufficient combustion without making the oxygen content too high, the total air pipe is filled with compressed air, and the air pressure of the compressed air is 0.9Mpa.

[0020] The beneficial effects of the above technical scheme of the present application are as follows:

[0021] 1. The multi-channel oxygen-enriched burner designed in the present application is characterized in that: after the gas pipe is ventilated, the first oxygen inlet pipe outside the gas pipe is contacted with the gas for the first time, and then the high-speed contact and mixing are carried out, and the mixing is carried out under the action of the cyclone air, so as to prepare for the next mixing. The coal air pipe is arranged outside the cyclone air pipe, the fuel is mixed, and the mixing is carried out under the action of the cyclone air. Then, the oxygen is supplemented by the second oxygen inlet pipe outside, the oxygen is increased in this step, the combustion is more sufficient, and the high-speed jet flow is generated under the action of the high-speed airflow of the beam air pipe, the turbulent flow of combustion is thrown away, and then the combustion is carried out in a larger space.

[0022] 2. The multi-channel oxygen-enriched burner designed in the present application is characterized in that: the contraction pipe and the throat pipe are arranged at the gas port, so that the gas is expanded through the first expansion pipe behind the gas port, the gas is extruded to the surrounding, and then the gas is mixed with the oxygen. Then, the oxygen in the coal air pipe and the second oxygen pipe is mixed at the second expansion pipe, and a better mixing effect is generated.

[0023] 3. The multi-channel oxygen-enriched burner designed in the present application is characterized in that: the manual cyclone air valve and the beam air valve are used, the cyclone air flow rate is adjusted, the mixing effect is adjusted, the cyclone air flow rate is increased, the internal gas and the oxygen are rotated, the gas in the coal air pipe outside is driven to be mixed multiple times, the internal airflow flow layer is mixed, and stratification is not formed.

[0024] 4、The present application designs a kind of multi-channel oxygen-enriched burner, by using arc-shaped block on the inner side wall of wind pipe, compressed air generates an inward convergent flow, in turn, the jet of airflow is farther when expanding, in turn, expansion combustion is carried out in larger space, to reduce the generation of harmful nitrogen oxides. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 For the structural diagram of the multi-channel oxygen-enriched burner of the present application;

[0026] Figure 2 For the schematic diagram of the oxygen-enriched burner head of the present application;

[0027] Figure 3 For the cross-sectional schematic diagram of the oxygen-enriched burner head of the present application;

[0028] Figure 4 For the schematic diagram of the wind direction of the oxygen-enriched burner head of the present application;

[0029] Figure 5 For Figure 3 The structure block diagram of A in the middle.

[0030] 1, gas pipe;2, first oxygen inlet pipe;3, second oxygen inlet pipe;4, convergent pipe;5, throat pipe;6, first expansion pipe;7, second expansion pipe;8, wind pipe;9, cyclone air pipe;10, coal air pipe;11, arc-shaped block;12, first connecting flange;13, second connecting flange;14, third connecting flange;15, fourth connecting flange;16, fifth connecting flange;17, oxygen main pipe;18, total wind pipe;19, first diaphragm valve;20, second diaphragm valve;21, cyclone air valve;22, wind valve. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings of the embodiments of the present application to make a detailed description. Figure 1-5 The technical scheme of the embodiments of the present application is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0032] As Figure 1-5 shown, a kind of multi-channel oxygen-enriched burner, including gas pipe 1, gas pipe 1 is connected to gas supply pipeline, first oxygen inlet pipe 2, second oxygen inlet pipe 3, convergent pipe 4, throat pipe 5, first expansion pipe 6, second expansion pipe 7, wind pipe 8, cyclone air pipe 9, coal air pipe 10;

[0033] A first oxygen inlet pipe 2 is provided outside the gas pipe 1, and the distance between the first oxygen inlet pipe 2 and the outer wall of the gas pipe 1 is 40 mm. A swirl air duct 9 is provided outside the first oxygen inlet pipe 2, and the distance between the swirl air duct 9 and the outer wall of the first oxygen inlet pipe 2 is 30 mm. A coal air duct 10 is provided outside the swirl air duct 9, and the distance between the coal air duct 10 and the outer wall of the swirl air duct 9 is 25 mm. A second oxygen inlet pipe 3 is provided outside the coal air duct 10, and the distance between the second oxygen inlet pipe 3 and the coal air duct 10 is 40 mm. An air bundle pipe 8 is provided on the outer wall of the second oxygen inlet pipe 3, and the distance between the air bundle pipe 8 and the second oxygen inlet pipe 3 is 20 mm.

[0034] The end of the gas pipe 1 is connected to the shrinkable tube 4, which is connected to the end of the gas pipe 1 by welding, and the shrinkable tube 4 coincides with the axis of the gas pipe 1. A throat pipe 5 is provided at the end of the shrinkable tube 4, and the end of the throat pipe 5 is connected to the end of the shrinkable tube 4 by child labor welding, and the throat pipe 5 coincides with the axis of the shrinkable tube 4. A first expansion tube 6 is provided at the end of the throat pipe 5, and the end with a smaller diameter of the first expansion tube 6 is connected to the end of the throat pipe 5, and the first expansion tube 6 and the throat pipe 5 are connected by welding. A second expansion tube 7 is provided at the end of the first expansion tube 6, and the end with a smaller diameter of the second expansion tube 7 is connected to the end with a larger diameter of the first expansion tube 6, and the second expansion tube 7 and the first expansion tube 6 are connected by welding.

[0035] like Figure 1-5 As shown, the first oxygen inlet pipe 2 is connected to the outer wall of the first expansion pipe 6. A notch is provided on the side wall of the first expansion pipe 6 for inputting oxygen into the first oxygen inlet pipe 2. The swirl air pipe 9 is connected to the connection between the first expansion pipe 6 and the second expansion pipe 7. A plurality of circular holes are provided in the annular portion of the connection between the first expansion pipe 6 and the second expansion pipe 7 to facilitate the swirl air to enter the second expansion pipe 7 for mixing. The coal air pipe 10 is connected to the second oxygen inlet pipe 3 and is connected to the second expansion pipe 7. A plurality of channels are provided on the side wall of the second expansion pipe 7 to allow the coal air to mix with the oxygen in the second oxygen inlet pipe 3.

[0036] In addition, the air confinement tube 8 is located on the outer wall of the second expansion tube 7 , and the air confinement tube 8 and the second expansion tube 7 are directly connected.

[0037] like Figure 1-5 As shown, an arc-shaped stopper 11 is provided on the inner wall of the air bundle tube 8 near the second expansion tube 7. The arc-shaped stopper 11 is connected to the inner wall of the second expansion tube 7 by welding. The thickness of the arc-shaped stopper 11 decreases from the end of the air bundle tube 8 to the inside of the air bundle tube 8, so that the wind flow in the air bundle tube 8 is toward the center of the pipe.

[0038] like Figure 1-5As shown, the included angle between the inner side wall of the first expansion pipe 6 and the central axis is 15°~20°, and the optimal selection is 18°, which can make the gas and the oxygen in the first oxygen inlet pipe 2 mix most fully. The included angle between the inner side wall of the second expansion pipe 7 and the central axis is 45°~55°, and the optimal selection is 52°, which can make the mixed laminar flow layer of the gas and the oxygen reach the maximum, and then the combustion is more sufficient.

[0039] As shown in the figure, Figure 1-5 The tail of the first oxygen inlet pipe 2 is connected with the gas pipe 1 through the first connecting flange 12, and the end of the first oxygen inlet pipe 2 is welded with a flange plate. Another flange plate is welded on the outer side wall of the gas pipe 1. The two flange plates are connected and fastened by using polyethylene gasket and bolts and nuts, thereby forming a connection. The tail of the cyclone air pipe 9 is connected with the first oxygen inlet pipe 2 through the second connecting flange 13. The tail of the coal air pipe 10 is connected with the cyclone air pipe 9 through the third connecting flange 14. The tail of the second oxygen inlet pipe 3 is connected with the coal air pipe 10 through the fourth connecting flange 15. The tail of the bundle air pipe 8 is connected with the second oxygen inlet pipe 3 through the fifth connecting flange 16.

[0040] As shown in the figure, Figure 1-5 The first oxygen inlet pipe 2 and the second oxygen inlet pipe 3 are connected to the oxygen main pipe 17. Channels are opened on the outer side walls of the tails of the first oxygen inlet pipe 2 and the second oxygen inlet pipe 3. Pipes are welded in the channels. The other ends of the pipes are connected with the oxygen main pipe 17. The cyclone air pipe 9 and the bundle air pipe 8 are connected to the total air pipe 18. Channels are also opened on the tails of the cyclone air pipe 9 and the bundle air pipe 8. Pipes for conveying compressed air are welded in the channels and connected to the total air pipe 18.

[0041] As shown in the figure, Figure 1-5 The first diaphragm valve 19 is arranged on the connecting pipe between the first oxygen inlet pipe 2 and the oxygen main pipe 17. The second diaphragm valve 20 is arranged on the connecting pipe between the second oxygen inlet pipe 3 and the oxygen main pipe 17. The cyclone air valve 21 is arranged between the cyclone air pipe 9 and the total air pipe 18. The bundle air valve 22 is arranged between the bundle air pipe 8 and the total air pipe 18.

[0042] As shown in the figure, Figure 1-5 The first diaphragm valve 19 and the second diaphragm valve 20 are pneumatic diaphragm valves. The cyclone air valve 21 and the bundle air valve 22 are manual diaphragm valves.

[0043] As shown in the figure, Figure 1-5 The total air pipe 18 is filled with compressed air, and the air pressure of the compressed air is 0.9Mpa.

[0044] In the present invention, unless otherwise clearly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified and limited, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0045] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A multi-channel oxygen-enriched burner, characterized in that: It comprises a gas pipe (1), a first oxygen inlet pipe (2), a second oxygen inlet pipe (3), a contraction pipe (4), a throat pipe (5), a first expansion pipe (6), a second expansion pipe (7), an air bundle pipe (8), a swirl air pipe (9), and a coal air pipe (10); A first oxygen inlet pipe (2) is provided on the outside of the gas pipe (1), a swirl air duct (9) is provided on the outside of the first oxygen inlet pipe (2), a coal air duct (10) is provided on the outside of the swirl air duct (9), a second oxygen inlet pipe (3) is provided on the outside of the coal air duct (10), and an air bundle pipe (8) is provided on the outer side wall of the second oxygen inlet pipe (3); The end of the gas pipe (1) is connected to the shrink tube (4), a throat tube (5) is provided at the end of the shrink tube (4), a first expansion tube (6) is provided at the end of the throat tube (5), and a second expansion tube (7) is provided at the end of the first expansion tube (6); The first oxygen inlet pipe (2) is connected to the outer wall of the first expansion pipe (6), the swirl air pipe is connected to the connection between the first expansion pipe (6) and the second expansion pipe (7), and the coal air pipe (10) and the second oxygen inlet pipe (3) are connected to the second expansion pipe (7).

2. A multi-channel oxygen-enriched burner according to claim 1, characterized in that: The air bundle pipe (8) is located on the outer side wall of the second expansion pipe (7).

3. The multi-channel oxygen-enriched burner according to claim 1, characterized in that: An arc-shaped stopper (11) is provided on the inner side wall of the air bundle tube (8) close to the second expansion tube (7), and the thickness of the arc-shaped stopper (11) decreases from the end of the air bundle tube (8) to the inside of the air bundle tube (8).

4. The multi-channel oxygen-enriched burner according to claim 1, characterized in that: The included angle between the inner side wall of the first expansion tube (6) and the central axis is 15° to 20°, and the included angle between the inner side wall of the second expansion tube (7) and the central axis is 45° to 55°.

5. The multi-channel oxygen-enriched burner according to claim 1, characterized in that: The tail end of the first oxygen inlet pipe (2) is connected to the gas pipe (1) via a first connecting flange (12), the tail end of the swirl air duct (9) is connected to the first oxygen inlet pipe (2) via a second connecting flange (13), the tail end of the coal air duct (10) is connected to the swirl air duct (9) via a third connecting flange (14), the tail end of the second oxygen inlet pipe (3) is connected to the coal air duct (10) via a fourth connecting flange (15), and the tail end of the bundle air duct (8) is connected to the second oxygen inlet pipe (3) via a fifth connecting flange (16).

6. The multi-channel oxygen-enriched burner according to claim 1, characterized in that: The first oxygen inlet pipe (2) and the second oxygen inlet pipe (3) are connected to the oxygen main pipe (17), and the swirl air pipe (9) and the air bundle pipe (8) are connected to the main air pipe (18).

7. A multi-channel oxygen-enriched burner according to claim 6, characterized in that: A first diaphragm valve (19) is provided between the first oxygen inlet pipe (2) and the oxygen main pipe (17), a second diaphragm valve (20) is provided between the second oxygen inlet pipe (3) and the oxygen main pipe (17), a swirl air valve (21) is provided between the swirl air pipe (9) and the main air pipe (18), and a swirl air valve (22) is provided between the swirl air pipe (8) and the main air pipe (18).

8. The multi-channel oxygen-enriched burner according to claim 7, characterized in that: The first diaphragm valve (19) and the second diaphragm valve (20) are pneumatic diaphragm valves, and the swirl air valve (21) and the air restraining valve (22) are manual diaphragm valves.

9. The multi-channel oxygen-enriched burner according to claim 6, characterized in that: The main air duct (18) contains compressed air, and the pressure of the compressed air is 0.9 MPa.

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