A kind of small-power burner suitable for fully premixed oxy-fuel combustion

Abstract

The present invention discloses a fully premixed small-power burner suitable for oxy-fuel combustion, which relates to the technical field of burners and includes a nozzle and a burner body that are connected and communicated. An anti-backfire plate is installed at the connection between the nozzle and the burner body. A water-cooled intake pipe is installed on the outside of the burner body. The water-cooled intake pipe is a double-layer structure inside and outside, and a circulating water flow is provided between the two pipes of the double layer inside and outside. One side of the water-cooled intake pipe is provided with a water-cooled main pipe, and a first cooling water inlet is opened on the water-cooled main pipe. A first cooling water outlet is opened at one end of the water-cooled intake pipe; a relief valve interface for connecting a relief valve is opened on the side of the water-cooled intake pipe close to the nozzle; a first cooling water jacket and a second cooling water jacket are respectively installed on the outside of the burner body and the outside of the nozzle, and a second cooling water inlet and a second cooling water outlet are opened on both the first cooling water jacket and the second cooling water jacket; effectively preventing the burner body from generating thermal deformation or thermal cracking and extending the service life of the nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and particularly relates to a fully premixed small-power burner suitable for pure oxygen combustion. Background Art

[0002] The fully premixed technology is to completely mix fuel with air or oxygen before entering the combustion chamber nozzle. The mixing of gas and air is ensured by an intelligent premix regulating valve system to ensure an accurate gas-to-air mixing ratio. Then, the gas and air pass through the mixer and mixing pipe simultaneously, and the gas molecules are completely dispersed, so that each gas molecule is surrounded by oxygen molecules, and the gas is completely burned without incomplete combustion products. The advantages of fully premixed combustion are: complete combustion, almost no generation of CO and NOx gases, and more than 95% of the products are CO2, and CO2 can be sealed and reused to achieve energy conservation and emission reduction.

[0003] In the actual operation process, the burner and the nozzle often maintain a very high temperature state. After long-term use, the burner is prone to thermal deformation or thermal rupture, shortening the service life of the nozzle. If the internal pressure of the burner is too high, it is prone to explosion due to excessive pressure, posing certain safety hazards. Summary of the Invention

[0004] To solve the above problems, the present invention provides a fully premixed small-power burner suitable for pure oxygen combustion, which includes a nozzle and a burner body connected in communication. A backfire prevention plate is installed at the connection between the nozzle and the burner body. A water-cooled inlet pipe is installed on the outer side of the burner body. The water-cooled inlet pipe is a double-layer structure inside and outside, and a circulating water flow is provided between the two pipes of the double layer inside and outside. A water-cooled main pipe is installed on one side of the water-cooled inlet pipe. A first cooling water inlet is opened on the water-cooled main pipe, and a first cooling water outlet is opened at one end of the water-cooled inlet pipe. A connection interface for a relief valve is opened on the side of the water-cooled inlet pipe close to the nozzle. A first cooling water jacket and a second cooling water jacket are respectively installed on the outer sides of the burner body and the nozzle. A second cooling water inlet and a second cooling water outlet are opened on both the first cooling water jacket and the second cooling water jacket.

[0005] Furthermore, the first cooling water jacket and the second cooling water jacket are respectively sleeved and rotatably connected to the outer sides of the burner body and the nozzle. A first bevel gear and a second bevel gear are respectively fixed on the outer sides of the first cooling water jacket and the second cooling water jacket. A third bevel gear is arranged below the first bevel gear and the second bevel gear. The third bevel gear meshes with the first bevel gear and the second bevel gear. A rotating rod is fixed at the bottom of the third bevel gear, and the other end of the rotating rod is connected to a stepper motor.

[0006] Furthermore, connecting arc plates are respectively fixed on the inner circles of the first bevel gear and the second bevel gear, and the connecting arc plates of the first bevel gear and the second bevel gear are respectively in contact with the outer circles of the burner body and the nozzle.

[0007] Further, the nozzle and the burner body are connected by threads.

[0008] Further, a connecting ring is fixed to the side wall of the first bevel gear. A through hole is formed in the outer side wall of the connecting ring, and a connecting hole corresponding to the outer side wall of the burner body is formed. The connecting hole is not communicated with the inside of the burner body, and a screw rod is provided to pass through the through hole and extend into the connecting hole.

[0009] Further, the nozzle and the water-cooled intake pipe are connected by an installation flange. Oblique small holes are formed in the installation flange, and an igniter and a flame detector are installed through the oblique small holes.

[0010] Further, a hollow observation tube is fixed to the end of the water-cooled intake pipe away from the nozzle. External threads are formed on the outer side surface of the observation tube, and a sight glass is threadedly connected to one end of the observation tube.

[0011] Further, the inclination angle between the water-cooled intake pipe and the water-cooled main pipe is 100°.

[0012] Further, the nozzle is a venturi tube and is funnel-shaped.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The anti-backfire plate prevents backfire. The burner body and the nozzle are continuously cooled by the first cooling water jacket and the second cooling water jacket, effectively preventing the burner body from thermal deformation or thermal rupture and extending the service life of the nozzle; if the internal pressure of the burner body is too high and the relief valve is broken through, overflow is achieved to prevent explosion due to excessive pressure.

[0015] 2. The first cooling water jacket and the second cooling water jacket can be driven to rotate by the stepping motor to prevent local overheating of the burner body. Compared with the fully surrounded cooling water jacket, it can effectively avoid the problem that the water flow accumulates at the lower end due to gravity and the temperature at the upper end is difficult to decrease, and effectively reduce the occurrence of high-temperature damage at the upper ends of the first cooling water jacket and the second cooling water jacket. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0017] Figure 2 is a schematic side view structural diagram of Embodiment 1 of the present invention;

[0018] Figure 3 is a schematic structural diagram of Embodiment 2 of the present invention;

[0019] Figure 4 is Figure 3 a schematic connection structural diagram of the first bevel gear in

[0020] The description of the reference numerals in the drawings is as follows: 1. Nozzle; 2. Second cooling water jacket; 3. Flame arrester plate; 4. Water-cooled intake pipe; 5. First cooling water jacket; 6. First cooling water inlet; 7. Sight glass; 8. First cooling water outlet; 9. Relief valve interface; 10. Mounting flange; 11. Second cooling water inlet; 12. Second cooling water outlet; 13. Igniter; 14. Flame detector device; 15. Burner body; 16. Water-cooled main pipe; 17. First bevel gear; 18. Second bevel gear; 19. Third bevel gear; 20. Rotating rod; 21. Stepper motor; 22. Connecting arc plate; 23. Connecting ring; 24. Through hole; 25. Screw rod. Detailed implementation manners

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] The following further describes the present invention with reference to the drawings in the specification:

[0024] Embodiment 1:

[0025] As Figure 1 and Figure 2As shown in the figure, a fully premixed small-power burner suitable for oxy-fuel combustion includes a nozzle 1 and a burner body 15 that are connected and communicate with each other. The nozzle 1 is a venturi tube and is funnel-shaped. A flashback prevention plate 3 is installed at the connection between the nozzle 1 and the burner body 15 to prevent flashback. A water-cooled intake pipe 4 is installed on the outside of the burner body 15. The water-cooled intake pipe 4 has a double-layer structure inside and outside, and a circulating water flow is provided between the two pipes of the double-layer structure inside and outside. A water-cooled main pipe 16 is installed on one side of the water-cooled intake pipe 4. The inclination angle between the water-cooled intake pipe 4 and the water-cooled main pipe 16 is 100°. A cooling water inlet 1 is provided on the water-cooled main pipe 16, and a cooling water outlet 1 is provided at one end of the water-cooled intake pipe 4. A bleed valve interface 9 for connecting a bleed valve is provided on the side of the water-cooled intake pipe 4 close to the nozzle 1, and a bleed valve is installed on one side of the bleed valve interface 9. A water-cooling jacket 1 is installed on the outside of the burner body 15 and a water-cooling jacket 2 is installed on the outside of the nozzle 1 respectively. A cooling water inlet 2 and a cooling water outlet 2 are provided on both the water-cooling jacket 1 and the water-cooling jacket 2. A hollow observation tube is fixed at the end of the water-cooled intake pipe 4 far from the nozzle 1. External threads are provided on the outer side of the observation tube, and a sight glass 7 is threadedly connected to one end of the observation tube.

[0026] The water-cooling jacket 1 and the water-cooling jacket 2 continuously cool the burner body 15 and the nozzle 1, effectively preventing the burner body 15 from generating thermal deformation or thermal rupture and extending the service life of the nozzle 1. If the internal pressure of the burner body 15 is too high and the bleed valve is broken through, overflow is achieved to prevent explosion due to excessive pressure.

[0027] During the use process, before the burner is used, the cooling water valve is opened. The burner body 15 maintains a constant temperature to prevent thermal shock damage during the combustion process. The water-cooling jacket 1 and the water-cooling jacket 2 continuously cool the burner to prevent the burner from generating thermal deformation or thermal rupture and extending the service time of the nozzle 1. The gas and air are precisely proportionally mixed in the external pipeline of the burner and then enter the burner body 15. The mixed gas comes to the nozzle 1 through the water-cooled intake pipe 4 and is ignited by the automatic igniter 13, and the flame burns. The flame detection device 14 detects the combustion situation. The operator can observe the combustion situation in the furnace through the sight glass 7.

[0028] In this embodiment, the nozzle 1 and the water-cooled intake pipe 4 are connected through a mounting flange 10. Oblique small holes are provided on the mounting flange 10, and an igniter 13 and a flame detection device 14 are installed through the oblique small holes. The flame detection device 14 and the bleed valve ensure the safe operation of the burner. If the flame goes out, the flame detection device 14 transmits a signal to the combustion controller to interrupt the gas supply.

[0029] During use, the flame detector 14 and the relief valve ensure the safe operation of the burner. If the flame goes out, the ion flame detector transmits a signal to the combustion controller, causing the gas supply to be interrupted; if the pressure inside the burner is too high, the relief valve is ruptured to achieve overflow and prevent explosion due to excessive pressure.

[0030] Embodiment 2:

[0031] On the basis of the above Embodiment 1, the first cooling water jacket 5 and the second cooling water jacket 2 are respectively sleeved and rotatably connected to the outside of the burner body 15 and the nozzle 1. A first bevel gear 17 and a second bevel gear 18 are respectively fixed to the outer sides of the first cooling water jacket 5 and the second cooling water jacket 2. A third bevel gear 19 is arranged below the first bevel gear 17 and the second bevel gear 18. The third bevel gear 19 meshes with the first bevel gear 17 and the second bevel gear 18. A rotating rod 20 is fixed to the bottom of the third bevel gear 19, and the other end of the rotating rod 20 is connected to a stepper motor 21.

[0032] Among them, the first cooling water jacket 5 and the second cooling water jacket 2 are arranged in a non-fully surrounding manner. The stepper motor 21 can drive the first cooling water jacket 5 and the second cooling water jacket 2 to rotate, so as to prevent local overheating of the burner body 15. Compared with the fully surrounding cooling water jacket, it can also effectively avoid the problem that the water flow accumulates at the lower end due to the action of gravity, resulting in difficulty in reducing the temperature at the upper end, and effectively reduce the occurrence of high-temperature damage at the upper ends of the first cooling water jacket 5 and the second cooling water jacket 2.

[0033] Connecting arc plates 22 are respectively fixed to the inner rings of the first bevel gear 17 and the second bevel gear 18. The connecting arc plates 22 of the first bevel gear 17 and the second bevel gear 18 are respectively in contact with the outer rings of the burner body 15 and the nozzle 1, and the first cooling water jacket 5 and the second cooling water jacket 2 are arranged in a staggered manner with the igniter 13 and the flame detector 14 in the above Embodiment 1.

[0034] By providing the connecting arc plates 22, the rotational stability of the first bevel gear 17 and the second bevel gear 18 is enhanced. The first bevel gear 17 and the second bevel gear 18 always respectively surround the outer edges of the burner body 15 and the nozzle 1, preventing the situation of disengaging from meshing due to different water flows in the first cooling water jacket 5 and the second cooling water jacket 2.

[0035] The nozzle 1 and the burner body 15 are connected by threads. A connecting ring 23 is fixed to the side wall of the first bevel gear 17. A through hole 24 is formed in the outer side wall of the connecting ring 23. A connecting hole is correspondingly formed in the outer side wall of the burner body 15. The connecting hole is not communicated with the inside of the burner body 15. A screw 25 can pass through the through hole 24 and extend into the connecting hole.

[0036] When the burner body 15 and the nozzle 1 need to be disassembled for maintenance or replacement, insert the screw 25 into the through hole 24, and then lock the screw 25 with a bolt, so that the first bevel gear 17 can drive the burner body 15 to rotate while rotating, so as to realize disassembly, without manual screwing anymore.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A fully premixed small-power burner suitable for oxy-fuel combustion, comprising a nozzle (1) and a burner body (15) connected in communication, characterized in that: A flame arrestor plate (3) is installed at the connection between the nozzle (1) and the burner body (15). A water-cooled intake pipe (4) is installed on the outer side of the burner body (15). The water-cooled intake pipe (4) has a double-layer structure inside and outside, and a circulating water flow is provided between the two pipes of the double layer inside and outside. One side of the water-cooled intake pipe (4) is provided with a water-cooled main pipe (16). A first cooling water inlet (6) is opened on the water-cooled main pipe (16), and a first cooling water outlet (8) is opened at one end of the water-cooled intake pipe (4); A blow-off valve interface (9) for connecting a blow-off valve is opened on one side of the water-cooled intake pipe (4) close to the nozzle (1); A first cooling water jacket (5) and a second cooling water jacket (2) are respectively installed on the outer sides of the burner body (15) and the nozzle (1). A second cooling water inlet (11) and a second cooling water outlet (12) are opened on both the first cooling water jacket (5) and the second cooling water jacket (2); The first cooling water jacket (5) and the second cooling water jacket (2) are respectively sleeved and rotatably connected to the outer sides of the burner body (15) and the nozzle (1). A first bevel gear (17) and a second bevel gear (18) are respectively fixed on the outer side surfaces of the first cooling water jacket (5) and the second cooling water jacket (2). A third bevel gear (19) is arranged below the first bevel gear (17) and the second bevel gear (18). The third bevel gear (19) meshes with the first bevel gear (17) and the second bevel gear (18). A rotating rod (20) is fixed at the bottom of the third bevel gear (19), and the other end of the rotating rod (20) is connected to a stepper motor (21); Connecting arc plates (22) are respectively fixed on the inner rings of the first bevel gear (17) and the second bevel gear (18). The connecting arc plates (22) of the first bevel gear (17) and the second bevel gear (18) are respectively in contact with the outer rings of the burner body (15) and the nozzle (1).

2. The all-premixed small-power burner suitable for oxy-fuel combustion according to claim 1, characterized in that: The nozzle (1) and the burner body (15) are connected by threads.

3. The all-premixed small-power burner suitable for oxy-fuel combustion according to claim 2, characterized in that: A connecting ring (23) is fixed on the side wall of the first bevel gear (17). A through hole (24) is opened on the outer side wall of the connecting ring (23). A connecting hole is correspondingly opened on the outer side wall of the burner body (15). The connecting hole is not communicated with the inside of the burner body (15). A screw (25) is provided and can pass through the through hole (24) and extend into the connecting hole.

4. A fully premixed small power burner suitable for oxy-fuel combustion, as claimed in claim 1, characterized in that: The nozzle (1) and the water-cooled intake pipe (4) are connected by an installation flange (10). Oblique small holes are opened on the installation flange (10). An igniter (13) and a flame detector (14) are installed through the oblique small holes.

5. A fully premixed small power burner suitable for oxy-fuel combustion, as claimed in claim 1, wherein: A hollow observation tube is fixed at one end of the water-cooled intake pipe (4) away from the nozzle (1). External threads are opened on the outer side surface of the observation tube. A sight glass (7) is threadedly connected to one end of the observation tube.

6. A fully premixed small-power burner suitable for oxy-fuel combustion according to claim 1, characterized in that: The inclination angle between the water-cooled intake pipe (4) and the water-cooled main pipe (16) is 100°.

7. A fully premixed small-power burner suitable for oxy-fuel combustion according to claim 1, characterized in that: The nozzle (1) is a venturi tube, and the nozzle (1) is in a funnel shape.

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