Low-nitrogen-oxygen combustion equipment

Abstract

The low-nitrogen-oxygen combustion equipment comprises a fuel pipe, a plurality of gas inlet pipes and a mixing pipe, the two ends of the mixing pipe are closed, the fuel pipe and the gas inlet pipes penetrate through the end face of one end of the mixing pipe and are inserted into the mixing pipe, and the gas inlet pipes are arranged at equal intervals along the circumference of the fuel pipe; the fuel pipe and the mixing pipe are coaxially arranged, a plurality of second air holes are formed in the end, away from the air inlet pipe, of the mixing pipe at equal intervals in the circumferential direction, a vibration mechanism is arranged at the end, away from the fuel pipe, of the mixing pipe and comprises a vibration ring and an ultrasonic vibrator, and the vibration ring is of a circular ring structure. The vibration ring is coaxially arranged in the mixing pipe, the ultrasonic vibrator penetrates through the mixing pipe and is connected with the mixing pipe, and one end of the ultrasonic vibrator is fixed on the vibration ring. The present application has an effect of reducing the amount of nitrogen oxides generated during combustion.

Description

Technical Field

[0001] This application relates to the field of low-NOx burners, and more particularly to a low-NOx combustion device. Background Technology

[0002] Low-NOx burners are devices that add a blower, induced draft fan, and frequency converter to a traditional burner, using control valves and integrated circuits to control the entry of clean energy into the boiler, thereby providing the boiler with more efficient thermal energy. Using low-NOx burners can reduce the content of nitrogen oxides in the exhaust gases after combustion, resulting in lower environmental pollution.

[0003] Existing low-NOx burners mix gaseous fuel and air to ensure complete combustion of the gaseous fuel, thereby reducing the formation of nitrogen oxides after combustion. When the local temperature or oxygen content is too high during the combustion of gaseous fuel, nitrogenous substances are easily converted into nitrogen oxides, causing air pollution. By mixing air and gaseous fuel, nitrogenous substances during fuel combustion can be converted into nitrogen gas, thereby reducing pollution.

[0004] The aforementioned technical solutions have the following drawbacks: when the low-NOx burner is small in size, the mixing of air and gaseous fuel is uneven, resulting in a high content of nitrogen oxides generated during combustion. Utility Model Content

[0005] In order to reduce the amount of nitrogen oxides generated during combustion, this application provides a low-NOx combustion device.

[0006] The low-NOx combustion device provided in this application adopts the following technical solution:

[0007] A low-NOx combustion device includes a fuel pipe, multiple air inlet pipes, and a mixing pipe. The mixing pipe is a pipe with both ends closed. The fuel pipe and air inlet pipes pass through one end face of the mixing pipe and are inserted into the mixing pipe. The multiple air inlet pipes are equidistantly spaced along the circumference of the fuel pipe. The fuel pipe and the mixing pipe are coaxially arranged. Multiple air holes are opened at the end of the mixing pipe away from the air inlet pipes. The air holes are equidistantly spaced along the circumference. A vibration mechanism is provided on the end of the mixing pipe away from the fuel pipes. The vibration mechanism includes a vibrating coil and an ultrasonic vibrator. The vibrating coil is a circular ring structure and is coaxially arranged inside the mixing pipe. The ultrasonic vibrator passes through the mixing pipe and is connected to the mixing pipe. One end of the ultrasonic vibrator is fixed to the vibrating coil.

[0008] By adopting the above technical solution, a fuel pipe and an air inlet pipe are installed on the mixing pipe. The fuel pipe introduces gaseous fuel into the mixing pipe, and the air inlet pipe introduces air into the mixing pipe, so that the air and gaseous fuel are mixed evenly in the mixing pipe. This allows the gas ejected from the second air hole to burn and generate less nitrogen oxides. By installing a vibrating coil in the mixing pipe, an ultrasonic vibrator can drive the vibrating coil to vibrate, so that the gas in the mixing pipe can be mixed more evenly, thereby reducing the amount of nitrogen oxides generated during fuel combustion.

[0009] Optionally, the mixing tube is provided with a plurality of mixing plates, each of which is a circular plate structure with a through hole in the middle, and the mixing plates are spaced apart in the mixing tube along the length of the mixing tube.

[0010] By adopting the above technical solution, multiple mixing plates are set inside the mixing tube, so that the gas flowing in the mixing tube can form turbulence on the mixing plates. The mixing plates block the gas flow trajectory, thereby agitating the gas and making the gas mix evenly.

[0011] Optionally, the mixing plate is inclined, with the center of the mixing plate closer to the fuel pipe and the intake pipe, and the connection between the mixing plate and the mixing pipe on the side away from the fuel pipe.

[0012] By adopting the above technical solution and setting the mixing plate at an angle, the gas can flow along the mixing plate when it flows, thereby generating convection when the gas flows in the mixing pipe, resulting in a better gas mixing effect.

[0013] Optionally, the inner diameter of the plurality of mixing plates gradually changes, with the mixing plate closer to the fuel pipe having a larger inner diameter and the mixing plate farther from the fuel pipe having a smaller inner diameter.

[0014] By adopting the above technical solution, and by making the diameter of the through holes on the mixing plate gradually change, the gas can come into contact with multiple mixing plates in sequence when flowing in the mixing tube, thereby achieving a better mixing effect.

[0015] Optionally, the mixing tube is provided with an outer cover, which covers the ultrasonic vibrator. The outer cover is sealed to the mixing tube, and the ultrasonic vibrator passes through the outer cover and is sealed to the outer cover.

[0016] By adopting the above technical solution, by setting an outer cover over the mixing pipe, the outer cover is placed over the connection between the ultrasonic vibrator and the mixing pipe, so that the outer cover plays a sealing role. When there is a gap between the ultrasonic vibrator and the connection between the mixing pipe, the probability of gaseous fuel leakage can be reduced.

[0017] Optionally, the outer cover is provided with a vent pipe that penetrates the outer cover, and a solenoid valve is provided on the vent pipe to control the opening and closing of the vent pipe.

[0018] By adopting the above technical solution, and by setting a vent pipe on the outer casing, the user can introduce inert gas into the outer casing through the vent pipe, thereby increasing the air pressure inside the outer casing. When there is a gap between the mixing pipe and the ultrasonic vibrator, the inert gas can flow into the mixing pipe, reducing the probability of gaseous fuel flowing out of the mixing pipe and improving the safety of use.

[0019] Optionally, a pressure gauge is provided on the outer cover for detecting the air pressure inside the outer cover.

[0020] By adopting the above technical solution, a pressure gauge is installed on the outer casing to detect the air pressure inside the casing. When there is a gap between the mixing tube and the ultrasonic vibrator, the inert gas inside the outer casing can flow into the mixing tube, causing the pressure gauge reading to change, thus facilitating maintenance by users.

[0021] Optionally, multiple ultrasonic vibrators are provided, with the length direction of the ultrasonic vibrator being the radial direction of the mixing tube, and the ultrasonic vibrators being equidistantly spaced along the circumference of the mixing tube.

[0022] By adopting the above technical solution, multiple ultrasonic vibrators are set on the mixing tube and arranged around the circumference of the vibration coil, thereby generating uniform vibration on the vibration coil and improving the gas mixing effect.

[0023] In summary, the beneficial technical effects of this application are as follows:

[0024] 1. By setting a fuel pipe and an air inlet pipe on the mixing pipe, the fuel pipe introduces gaseous fuel into the mixing pipe, and the air inlet pipe introduces air into the mixing pipe, so that the air and gaseous fuel are evenly mixed in the mixing pipe, thereby enabling the gas ejected from the second air hole to burn and generate less nitrogen oxides. By setting a vibrating coil in the mixing pipe, the ultrasonic vibrator can drive the vibrating coil to vibrate, so that the gas in the mixing pipe can be more evenly mixed, thereby reducing the amount of nitrogen oxides generated during fuel combustion.

[0025] 2. By installing a vent pipe on the outer casing, the user can introduce inert gas into the outer casing through the vent pipe, thereby increasing the air pressure inside the outer casing. When there is a gap between the mixing pipe and the ultrasonic vibrator, the inert gas can flow into the mixing pipe, reducing the chance of gaseous fuel flowing out of the mixing pipe and improving the safety of use.

[0026] 3. By installing a pressure gauge on the outer casing, the pressure gauge can detect the air pressure inside the casing. When there is a gap between the mixing tube and the ultrasonic vibrator, the inert gas inside the casing can flow into the mixing tube, causing the pressure gauge reading to change, thus facilitating maintenance by the user. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a cross-sectional schematic diagram of an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the hybrid plate according to an embodiment of this application.

[0030] Reference numerals: 1. Fuel pipe; 11. Air inlet 1; 2. Air intake pipe; 3. Mixing pipe; 31. Air inlet 2; 32. Mixing plate; 4. Vibration mechanism; 41. Vibrating coil; 42. Ultrasonic vibrator; 43. Outer cover; 44. Pressure gauge; 45. Vent pipe; 46. Solenoid valve. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] This application discloses a low-NOx combustion device, referring to... Figure 1 and Figure 2 It includes a fuel pipe 1, an air intake pipe 2, and a mixing pipe 3. The fuel pipe 1 and the mixing pipe 3 are coaxially connected. Multiple air intake pipes 2 are arranged at equal intervals along the circumference of the fuel pipe 1. The air intake pipes 2 are used to introduce air into the mixing pipe 3. The fuel pipe 1 is used to introduce gaseous fuel into the mixing pipe 3. The gaseous fuel and air are uniformly mixed in the mixing pipe 3 and discharged. After the burner ignites the mixed gas, it can produce an open flame and reduce the amount of nitrogen oxides produced.

[0033] Reference Figure 3 The mixing pipe 3 is a pipe structure closed at both ends. One end of the fuel pipe 1 passes through the mixing pipe 3 and is disposed inside the mixing pipe 3. Multiple air holes 11 are opened on the end face of the fuel pipe 1 located inside the mixing pipe 3. The air holes 11 are arranged at equal intervals along the circumference of the fuel pipe 1. When the gaseous fuel flows inside the fuel pipe 1, the gaseous fuel can enter the mixing pipe 3 evenly through the air holes 11. One end of the intake pipe 2 passes through the end face of the mixing pipe 3 and is inserted into the mixing pipe 3. The fuel pipe 1 and the intake pipe 2 are located on the same side.

[0034] Reference Figure 3 Multiple air holes 31 are provided at one end of the mixing pipe 3 away from the fuel pipe 1 and the air intake pipe 2. The air holes 31 are equidistantly spaced along the circumference of the mixing pipe 3. After the gaseous fuel and air are mixed in the mixing pipe 3, they are discharged through the air holes 31.

[0035] Reference Figure 3Multiple mixing plates 32 are disposed within the mixing tube 3, spaced apart along the length of the mixing tube 3 on its inner wall. Each mixing plate 32 is a circular plate with a through hole in the center, and is coaxially arranged with the mixing tube 3. The inner diameters of the mixing plates 32 gradually change, with the plates closer to the fuel pipe 1 and the air intake pipe 2 having larger inner diameters, and the plates further away from these pipes having smaller inner diameters. The mixing plates 32 have an inclined plate structure, with the side connected to the mixing tube 3 further away from the fuel pipe 1 and the air intake pipe 2, and the inner ring side of the mixing plate 32 closer to the fuel pipe 1 and the air intake pipe 2. When gaseous fuel and air flow within the mixing tube 3, they flow along the surface of the mixing plates 32, thereby creating turbulence and convection within the mixing tube 3, allowing the gaseous fuel and air to mix uniformly and be discharged from the second air hole 31.

[0036] Reference Figure 2 and Figure 3 A vibration mechanism 4 is installed on the side of the mixing tube 3 away from the fuel pipe 1 and the intake pipe 2. The vibration mechanism 4 includes a vibrating coil 41 and multiple ultrasonic vibrators 42. The ultrasonic vibrators 42 pass through the mixing tube 3 and are sealed and fixed to the mixing tube 3. A wire is installed on the side of the ultrasonic vibrator 42 outside the mixing tube 3 to supply power to the ultrasonic vibrator 42. The ultrasonic vibrators 42 are arranged radially along the mixing tube 3, and multiple ultrasonic vibrators 42 are arranged at equal intervals along the circumference of the mixing tube 3. The vibrating coil 41 is a circular rubber structure and is coaxially arranged inside the mixing tube 3. One end of the ultrasonic vibrator 42 located inside the mixing tube 3 is fixed to the vibrating coil 41. When the ultrasonic vibrator 42 is started, it generates mechanical vibration, which is transmitted to the vibrating coil 41 and makes the gas in the mixing tube 3 uniformly mixed.

[0037] Reference Figure 1 The mixing tube 3 is covered by an outer cover 43, which covers the ultrasonic vibrator 42. The end of the ultrasonic vibrator 42 passes through the outer cover 43 and is sealed to it. A vent pipe 45 is installed on the outer cover 43, and a solenoid valve 46 is installed on the vent pipe 45. When the solenoid valve 46 is opened, the user can introduce inert gas into the outer cover 43 through the vent pipe 45, thereby making the air pressure inside the outer cover 43 greater than the air pressure inside the mixing tube 3. When a gap is formed at the connection between the ultrasonic vibrator 42 and the mixing tube 3, the probability of gaseous fuel entering the outer cover 43 from the mixing tube 3 can be reduced.

[0038] Reference Figure 1 A pressure gauge 44 is installed on the outer cover 43. The pressure gauge 44 passes through and is fixed on the outer cover 43. The pressure gauge 44 is used to detect the air pressure inside the outer cover 43. When a leak occurs in the mixing pipe 3 and the outer cover 43, the high-pressure gas stored inside the outer cover 43 leaks, and the air pressure value inside the outer cover 43 changes. The user can detect the gas leak in the outer cover 43 by checking the pressure gauge 44 and carry out maintenance.

[0039] The implementation principle of this application embodiment is as follows: by setting a fuel pipe 1 and an air inlet pipe 2 on the mixing pipe 3, the fuel pipe 1 is used to introduce gaseous fuel into the mixing pipe 3, and the air inlet pipe 2 is used to introduce air into the mixing pipe 3. The air and gaseous fuel are mixed evenly and sprayed out from the second air hole 31. After igniting the gaseous fuel, less nitrogen oxides are produced. By setting a vibration mechanism 4 on the mixing pipe 3, the vibration mechanism 4 can generate mechanical vibration, thereby promoting the uniform mixing of air and gaseous fuel.

[0040] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-NOx combustion device, characterized in that: It includes a fuel pipe (1), multiple air intake pipes (2) and a mixing pipe (3). The mixing pipe (3) is a pipe closed at both ends. The fuel pipe (1) and the air intake pipes (2) pass through one end face of the mixing pipe (3) and are inserted into the mixing pipe (3). The multiple air intake pipes (2) are arranged at equal intervals along the circumference of the fuel pipe (1). The fuel pipe (1) and the mixing pipe (3) are arranged coaxially. Multiple air holes (31) are opened on the end of the mixing pipe (3) away from the air intake pipes (2). The mixing tube (3) is equidistantly spaced along the circumference. A vibration mechanism (4) is provided on the end of the mixing tube (3) away from the fuel tube (1). The vibration mechanism (4) includes a vibration ring (41) and an ultrasonic vibrator (42). The vibration ring (41) is a circular ring structure and is coaxially arranged inside the mixing tube (3). The ultrasonic vibrator (42) passes through the mixing tube (3) and is connected to the mixing tube (3). One end of the ultrasonic vibrator (42) is fixed on the vibration ring (41).

2. The low-NOx combustion device according to claim 1, characterized in that: The mixing tube (3) is provided with a plurality of mixing plates (32). The mixing plate (32) is a circular plate structure with a through hole in the middle. The mixing plates (32) are arranged at intervals in the mixing tube (3) along the length direction of the mixing tube (3).

3. The low-NOx combustion device according to claim 2, characterized in that: The mixing plate (32) is inclined, with the center of the mixing plate (32) close to the fuel pipe (1) and the intake pipe (2), and the connection between the mixing plate (32) and the mixing pipe (3) on the side away from the fuel pipe (1).

4. The low-NOx combustion device according to claim 3, characterized in that: The inner diameter of the multiple mixing plates (32) gradually changes, with the mixing plate (32) closer to the fuel pipe (1) having a larger inner diameter and the mixing plate (32) further away from the fuel pipe (1) having a smaller inner diameter.

5. A low-NOx combustion device according to claim 1, characterized in that: The mixing tube (3) is provided with an outer cover (43), which covers the ultrasonic vibrator (42). The outer cover (43) is sealed to the mixing tube (3), and the ultrasonic vibrator (42) passes through the outer cover (43) and is sealed to the outer cover (43).

6. The low-NOx combustion device according to claim 5, characterized in that: The outer cover (43) is provided with a vent pipe (45), which passes through the outer cover (43). A solenoid valve (46) is provided on the vent pipe (45), which is used to control the opening and closing of the vent pipe (45).

7. A low-NOx combustion device according to claim 6, characterized in that: A pressure gauge (44) is provided on the outer cover (43), and the pressure gauge (44) is used to detect the air pressure inside the outer cover (43).

8. A low-NOx combustion device according to claim 1, characterized in that: Multiple ultrasonic vibrators (42) are provided. The length direction of the ultrasonic vibrator (42) is radial to the mixing tube (3). The ultrasonic vibrators (42) are arranged at equal intervals along the circumference of the mixing tube (3).

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