Ultra-low nitrogen burner

Abstract

The utility model relates to the technical field of combustor equipment, and discloses an ultra-low nitrogen combustor which comprises a fan assembly, a Venturi valve, a fuel gas leading-in assembly, a connecting cylinder, a combustion head and an ignition assembly. Wherein the fan assembly is provided with an air inlet and an air outlet, one end of the venturi valve is communicated with the air inlet, the other end of the venturi valve is provided with an air filter element, the fuel gas leading-in assembly is arranged on the side face of the venturi valve, one end of the connecting cylinder is communicated with the air outlet of the fan assembly, and the other end of the connecting cylinder is communicated with the air filter element. The ignition assembly is arranged on the outer side of the combustion head. According to the utility model, air and gas are mixed in advance through the cooperation of the Venturi valve and the gas introduction assembly, and then the mixed gas is introduced into the connecting cylinder through the fan assembly for further mixing, so that the air and the gas are mixed more sufficiently, the gas can be combusted more sufficiently after entering the combustion head, and the combustion efficiency is improved; the emission of nitrogen oxides is reduced, and ultralow-nitrogen clean combustion is realized.

Description

Technical Field

[0001] This utility model relates to the field of burner equipment technology, specifically to an ultra-low nitrogen burner. Background Technology

[0002] Nitrogen oxides (NOx) are one of the major sources of air pollution and a significant precursor to PM2.5 secondary particulate matter. With the increasing use of natural gas, liquefied petroleum gas (LPG), and coal syngas, pollution from gas combustion, especially reducing NOx emissions, has become an urgent task. Therefore, controlling NOx generation during natural gas combustion and vigorously developing low-NOx clean combustion technologies are of great importance.

[0003] The invention patent with publication number CN109539253A discloses an ultra-low nitrogen gas burner, including a fan and a horizontally arranged mixing cylinder. The fan includes a volute and a motor mounted on the volute. The motor is connected to an electrical control box mounted on the volute, and the volute has an air inlet and an air outlet. One end of the mixing cylinder is connected to the air outlet on the volute through a flange. A gas pipe is arranged inside the mixing cylinder. One end of the gas pipe extends to the outside of the mixing cylinder through an extension hole opened on the side wall of the mixing cylinder, and the position of the extension hole is close to the air outlet. An ignition component is installed on the gas pipe, and a flame stabilizing cover is arranged at the end of the gas pipe away from the air outlet. Several blades are arranged inside the flame stabilizing cover.

[0004] In the above technical solution, the staff operates the blower through the electrical control box. The blower blows air into the combustion chamber, and natural gas enters the combustion chamber through the fuel tank. The direct current airflow is turned into a swirling airflow through the flame stabilizer to promote the mixing of air and natural gas. However, this mixing time is short and the mixing is insufficient, which can easily lead to incomplete combustion of the gas. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the purpose of this utility model is to provide an ultra-low nitrogen burner.

[0006] The ultra-low nitrogen burner of this utility model includes:

[0007] A fan assembly having an air inlet and an air outlet;

[0008] A venturi valve, one end of which is connected to the air inlet, and the other end of which is provided with an air filter.

[0009] A gas inlet assembly is disposed on the side of the venturi valve and is used to introduce gas into the venturi valve.

[0010] A connecting cylinder, one end of which is connected to the air outlet of the fan assembly;

[0011] A burner head, one end of which is connected to the other end of the connecting cylinder;

[0012] An ignition assembly is disposed on the outside of the burner head.

[0013] Preferably, the fan assembly includes a volute, a fan and a circuit module disposed on the volute, and the air inlet and air outlet are respectively disposed on the side and bottom of the volute.

[0014] Preferably, the fan assembly further includes a housing that covers the outside of the fan and the circuit module.

[0015] Preferably, the gas inlet assembly includes a gas interface flange disposed on the side of the venturi valve, a gas pipe connected to the gas interface flange, a gas valve disposed at the end of the gas pipe away from the gas interface flange, and a solenoid valve disposed on the gas valve.

[0016] Preferably, the connecting cylinder includes a connecting cylinder body, burner flanges disposed at both ends of the connecting cylinder body, and an air inlet flange. The burner flanges are connected to the burner head, and the air inlet flanges are connected to the air outlet of the fan assembly.

[0017] Preferably, a flow guide ring is provided at one end of the connecting cylinder near the burner flange.

[0018] Preferably, the burner head includes a mixing cylinder, a combustion cylinder disposed at one end of the mixing cylinder, a fixing flange disposed at the other end of the mixing cylinder, a baffle disposed at the end of the combustion cylinder away from the mixing cylinder, the fixing flange being connected to the burner flange, and a plurality of vent holes being provided on the outer side of the combustion cylinder.

[0019] Preferably, the ignition assembly includes a fixing plate and an ignition rod disposed on the fixing plate, wherein the ignition end of the ignition rod extends to the combustion cylinder.

[0020] Preferably, the ignition assembly further includes a flame detection probe disposed on the fixed plate for detecting the flame condition.

[0021] Preferably, the air filter, the venturi valve, the fan assembly, the connecting cylinder, and the burner head are arranged in a U-shape.

[0022] The ultra-low NOx burner described in this utility model has the advantage that, through the cooperation of the Venturi valve and the gas inlet assembly, the air and gas are mixed in advance, and then the mixed gas is introduced into the connecting cylinder by the fan assembly for further mixing, so that the air and gas are mixed more thoroughly. After entering the burner head, the gas can burn more completely, improving combustion efficiency, reducing nitrogen oxide emissions, and achieving ultra-low NOx clean combustion. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the ultra-low nitrogen burner described in this utility model;

[0024] Figure 2 This is a structural schematic diagram of the ultra-low NOx burner described in this utility model (from another perspective);

[0025] Figure 3 This is a schematic diagram of the structure of the connecting cylinder described in this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the combustion head described in this utility model;

[0027] Figure 5 This is a structural schematic diagram of the ignition assembly described in this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Fan assembly, 101. Volute, 102. Fan, 103. Circuit module, 104. Housing;

[0030] 2 Venturi valves, 21 air filter elements;

[0031] 3 Gas inlet assembly, 31 Gas interface flange, 32 Gas connection pipe, 33 Gas valve, 34 Solenoid valve;

[0032] 4. Connecting cylinder; 41. Connecting cylinder body; 42. Burner flange; 43. Air inlet flange; 44. Guide ring;

[0033] 5. Combustion head, 51. Mixing cylinder, 52. Combustion cylinder, 53. Fixing flange, 54. Baffle;

[0034] 6. Ignition assembly, 61. Mounting plate, 62. Ignition rod, 63. Flame inspection probe, 64. Mounting pad. Detailed Implementation

[0035] like Figures 1-5As shown, the ultra-low NOx burner disclosed in this embodiment includes a fan assembly 1, a venturi valve 2, a gas inlet assembly 3, a connecting cylinder 4, a burner head 5, and an ignition assembly 6. The fan assembly 1 has an air inlet and an air outlet. One end of the venturi valve 2 is connected to the air inlet, and the other end of the venturi valve 2 is equipped with an air filter element 21. The gas inlet assembly 3 is located on the side of the venturi valve 2 and is used to introduce gas into the venturi valve 2. One end of the connecting cylinder 4 is connected to the air outlet of the fan assembly 1. One end of the burner head 5 is connected to the other end of the connecting cylinder 4. The ignition assembly 6 is located on the outside of the burner head 5.

[0036] In actual operation, air is filtered through air filter element 21 to remove dust. The filtered air then enters venturi valve 2, and gas inlet component 3 introduces gas into venturi valve 2. Air and gas undergo preliminary mixing in venturi valve 2. Venturi valve 2 is connected to fan component 1. After being energized, fan component 1 creates negative pressure. Under the action of negative pressure, the ball inside venturi valve 2 is in the open state. After entering venturi valve 2, air and gas enter fan component 1 and then enter the connecting cylinder 4. At this point, air and gas are fully and evenly mixed. Under the action of air pressure from fan component 1, the evenly mixed gas enters burner head 5. After the mixed gas flows out of burner head 5, it is ignited by ignition component 6 on burner head 5. Ignition enables burner operation. The front end of burner head 2 is the combustion zone, where the mixed gas after ignition forms a combustion zone. In this embodiment, the burner fully mixes air and fuel gas before combustion, enabling the fuel gas to burn more completely, improving combustion efficiency, reducing nitrogen oxide emissions, and achieving ultra-low nitrogen clean combustion.

[0037] Preferably, the fan assembly 1 includes a volute 101, a fan 102 mounted on the volute 101, and a circuit module 103. The air inlet and outlet are located on the side and bottom of the volute 101, respectively. In this embodiment, the circuit module 103 is integrated with the burner and mounted on the fan 102. The circuit module 103 primarily uses a German Ramtech BT330 combustion controller. The BT330 combines the advantages of an electronic air-fuel ratio control system, allowing connection to three actuator elements (gas actuator, air actuator, and flue gas actuator). Through an expansion module, it can achieve frequency conversion adjustment of analog signals for the fan. It also integrates safety interlocks, monitoring devices (gas and air pressure), sealing detection, and flame detection. By setting parameters, the combustion timing control and air-fuel ratio control can be adjusted over a wide range to adapt to different combustion conditions. The precise control system enables the burner to achieve balanced combustion.

[0038] The fan assembly 1 also includes a housing 104, which covers the outside of the fan 102 and the circuit module 103, thus better protecting the fan 102 and the circuit module 103. The portion of the housing 104 located in the fan 102 has ventilation holes for heat dissipation of the fan 102.

[0039] Please continue to refer to Figure 1 and Figure 2 The gas inlet assembly 3 includes a gas interface flange 31 located on the side of the venturi valve 2, a gas pipe 32 connected to the gas interface flange 31, a gas valve 33 located at the end of the gas pipe 32 away from the gas interface flange 31, and a solenoid valve 34 mounted on the gas valve 33. The gas interface flange 31 and the venturi valve 2 are integrally formed, resulting in a more stable, durable, and aesthetically pleasing connection. Reinforcing ribs are provided between the gas interface flange 31 and the venturi valve 2 to improve the stability of the gas interface flange 31.

[0040] In this embodiment, the main function of the gas valve 33 is to control the on / off state and flow rate of the gas. It ensures that gas is supplied when needed and cut off when not needed, thus guaranteeing the safety of the combustion system. The solenoid valve 34 is used for rapid response to control signals, achieving precise on / off control of the gas. The venturi valve 2 regulates the airflow by controlling the compressed air to push the cylinder and change the cone position. In the combustion system, it can precisely control the flow rate of the combustion air, thereby optimizing combustion efficiency. The combination of the gas valve 33 and the solenoid valve 34 enables precise control of the gas flow rate. In this embodiment, the solenoid valve 33 ensures a precise mixing ratio of gas and air, thereby achieving efficient combustion.

[0041] Preferably, the connecting cylinder 4 includes a connecting cylinder body 41, burner flanges 42 disposed at both ends of the connecting cylinder body 41, and an air inlet flange 43. The burner flanges 42 are connected to the burner head 5, and the air inlet flanges 43 are connected to the air outlet of the fan assembly 1. In this embodiment, the connecting cylinder 4 is arranged in an L-shape, as shown below. Figure 3As shown, one end of the burner is a square pipe, and the other end is a circular pipe perpendicular to the square pipe. The circular pipe is collinear with the center line of the burner head 5. One end of the circular pipe is sealed by a cover plate, and the other end is connected to the combustion flange 42. The end of the square pipe away from the circular pipe is connected to the air inlet flange 43. An air outlet flange is provided at the air outlet of the volute 101. The air outlet flange and the air inlet flange 43 are fixedly connected by screws, saving space occupied by the burner. Specifically, the air filter 21, venturi valve 2, fan assembly 1, connecting cylinder 4, and burner head 5 are arranged in a U-shape, further saving space. A guide ring 44 is provided at the end of the connecting cylinder 41 near the burner flange 42. The guide ring 44 is located at the end of the circular pipe away from the square pipe. The guide ring 44 can be composed of multiple axially distributed fan blades. Under the action of the fan assembly 1, it can rotate. During the rotation, it spirals the air-fuel mixture, making the air and fuel mixture more uniform, increasing the contact area in the combustion zone, and thus enabling the fuel to burn more completely.

[0042] Please refer to Figure 4 The burner head 5 includes a mixing cylinder 51, a combustion cylinder 52 disposed at one end of the mixing cylinder 51, a fixing flange 53 disposed at the other end of the mixing cylinder 51, and a baffle 54 disposed at the end of the combustion cylinder 52 away from the mixing cylinder 51. The fixing flange 53 is connected to the burner flange 42. Several vent holes are provided on the outer side of the combustion cylinder 52. The air-fuel mixture first enters the mixing cylinder 51, then enters the combustion cylinder 52 and escapes from the vent holes, and is ignited and burned by the ignition assembly 6.

[0043] Please refer to Figure 5 The ignition assembly 6 includes a fixing plate 61 and an ignition rod 62 mounted on the fixing plate 61, with the ignition end of the ignition rod 62 extending to the combustion chamber 52. Specifically, two ignition rods 62 are provided, symmetrically arranged to improve combustion efficiency. In this embodiment, the fixing plate 61 is mounted on the burner flange 42, and the ignition end of the ignition rod 62 extends through the burner flange 42 to the combustion chamber 52. Additionally, a mounting gasket 64 is provided between the fixing plate 61 and the burner flange 42. The mounting gasket 64 improves the stability of the fixing plate 61 installation, allowing the ignition rod 62 to function better. In this embodiment, the ignition assembly 6 also includes a flame detection probe 63 mounted on the fixing plate 61 for detecting the flame condition. The flame detection probe 63 employs a flame detection system for real-time monitoring, gas-air pressure protection, gas leak protection, and fault display, ensuring safe and convenient maintenance throughout the combustion process.

[0044] In summary, this embodiment uses the Venturi valve 2 and the gas inlet assembly 3 to mix air and gas in advance, and then the blower assembly 1 guides the mixed gas into the connecting cylinder 4 for further mixing. This makes the air and gas mix more thoroughly, and the gas can burn more completely after entering the burner head 5, which improves combustion efficiency, reduces nitrogen oxide emissions, and achieves ultra-low nitrogen clean combustion.

[0045] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0046] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model.

Claims

1. An ultra-low NOx burner, characterized in that, include: A fan assembly (1) having an air inlet and an air outlet; Venturi valve (2), one end of which is connected to the air inlet, and the other end of which is provided with an air filter (21); Gas inlet assembly (3), which is disposed on the side of the venturi valve (2) and is used to introduce gas into the venturi valve (2); Connecting cylinder (4), one end of which is connected to the air outlet of the fan assembly (1); A burner head (5), one end of which is connected to the other end of the connecting cylinder (4); Ignition assembly (6), which is disposed on the outside of the burner head (5).

2. The ultra-low NOx burner according to claim 1, characterized in that, The fan assembly (1) includes a volute (101), a fan (102) and a circuit module (103) disposed on the volute (101), and the air inlet and air outlet are respectively disposed on the side and bottom of the volute (101).

3. The ultra-low NOx burner according to claim 2, characterized in that, The fan assembly (1) also includes a housing (104) that covers the outside of the fan (102) and the circuit module (103).

4. The ultra-low NOx burner according to claim 1, characterized in that, The gas inlet assembly (3) includes a gas interface flange (31) disposed on the side of the venturi valve (2), a gas pipe (32) connected to the gas interface flange (31), a gas valve (33) disposed at the end of the gas pipe (32) away from the gas interface flange (31), and a solenoid valve (34) disposed on the gas valve (33).

5. The ultra-low NOx burner according to claim 1, characterized in that, The connecting cylinder (4) includes a connecting cylinder body (41), a burner flange (42) disposed at both ends of the connecting cylinder body (41), and an air inlet flange (43). The burner flange (42) is connected to the burner head (5), and the air inlet flange (43) is connected to the air outlet of the fan assembly (1).

6. The ultra-low NOx burner according to claim 5, characterized in that, A flow guide ring (44) is provided at one end of the connecting cylinder (41) near the burner flange (42).

7. The ultra-low NOx burner according to claim 5, characterized in that, The burner head (5) includes a mixing cylinder (51), a combustion cylinder (52) disposed at one end of the mixing cylinder (51), a fixing flange (53) disposed at the other end of the mixing cylinder (51), and a baffle (54) disposed at the end of the combustion cylinder (52) away from the mixing cylinder (51). The fixing flange (53) is connected to the burner flange (42), and a plurality of vent holes are provided on the outer side of the combustion cylinder (52).

8. The ultra-low NOx burner according to claim 7, characterized in that, The ignition assembly (6) includes a fixing plate (61) and an ignition rod (62) disposed on the fixing plate (61), the ignition end of the ignition rod (62) extending to the combustion cylinder (52).

9. The ultra-low NOx burner according to claim 8, characterized in that, The ignition assembly (6) also includes a flame inspection probe (63) disposed on the fixing plate (61) for detecting the flame condition.

10. The ultra-low NOx burner according to any one of claims 1-9, characterized in that, The air filter (21), the venturi valve (2), the fan assembly (1), the connecting cylinder (4), and the burner head (5) are arranged in a U-shape.

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