Burner structure of premix burner with adjustable swirl intensity

Abstract

The application discloses a premix burner nozzle structure with adjustable rotational flow intensity, which comprises a shell, a flow channel in the shell, an air inlet communicated with the flow channel at the upper end of the shell, a burner outlet communicated with the flow channel at the lower end of the shell, an air flow adjusting port and a gas inlet on the peripheral wall of the shell, a driving impeller, a rotational flow impeller rotatably arranged in the shell and located below the gas inlet in the axial direction of the shell, and a speed changing device. The driving impeller and the rotational flow impeller are drivingly connected through the speed changing device, so that the rotational flow impeller is adapted to rotate under the driving of the driving impeller, and the speed changing device is adapted to adjust the speed ratio of the driving impeller and the rotational flow impeller. The premix burner nozzle structure with adjustable rotational flow intensity has the advantages of high combustion efficiency, small pollution and strong applicability.

Description

Technical Field

[0001] The invention relates to the technical field of burner manufacturing, in particular to a burner nozzle structure of a premixed burner with adjustable swirl intensity. Background Art

[0002] The amount of nitrogen oxide pollutants emitted by a burner is related to its combustion efficiency.

[0003] Swirl premix burners utilize a swirler at the burner nozzle to promote mixing of gas and air, improving combustion efficiency and ensuring complete combustion of the gas, thereby reducing pollutants. However, different operating conditions require different swirl intensity levels. For example, when the equipment is operating at a low load, a low swirl intensity should be used to minimize pressure loss and optimize combustion efficiency. When the equipment is operating at a high load, a high swirl intensity should be used to enhance airflow mixing and improve combustion efficiency.

[0004] The premixed burner in the related technology has a swirler whose swirler is difficult to adjust the swirl intensity and difficult to achieve an ideal mixing effect for different operating conditions, which limits the adaptability and flexibility of the burner under different operating conditions, resulting in incomplete combustion, low combustion efficiency and increased pollutants under some operating conditions. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a burner structure of a premix burner with adjustable swirl intensity. The burner structure of the premix burner with adjustable swirl intensity has the advantages of high combustion efficiency, low pollution, and wide applicability.

[0006] To achieve the above-mentioned purpose, according to an embodiment of the present invention, a burner structure of a premixed burner with adjustable swirl intensity is proposed, the burner structure of the premixed burner with adjustable swirl intensity comprises: a shell, a flow channel is provided in the shell, an upper end of the shell is provided with an air inlet connected to the flow channel and a lower end of the shell is provided with a burner outlet connected to the flow channel, an air flow regulating port and a gas inlet are provided on the peripheral wall of the shell, the air flow regulating port is suitable for letting in or exhausting air, and the gas inlet is located below the air flow regulating port in the axial direction of the shell; a driving impeller, the driving impeller is rotatably provided in the shell and The driving impeller is located above the air flow regulating port in the axial direction of the outer shell, and is constructed to be suitable for rotating under the drive of the air flow entering the air inlet, and the rotation speed of the driving impeller is suitable for changing according to the flow rate of the air flow entering the air inlet; the swirl impeller is rotatably arranged in the outer shell and is located below the gas inlet in the axial direction of the outer shell; the speed change device, the driving impeller and the swirl impeller are connected in transmission through the speed change device so that the swirl impeller is suitable for rotating under the drive of the driving impeller, and the speed change device is constructed to be suitable for adjusting the speed ratio of the driving impeller and the swirl impeller.

[0007] The burner structure of the premixed burner with adjustable swirl intensity according to the embodiment of the present invention has the advantages of high combustion efficiency, low pollution, and strong applicability.

[0008] In addition, the burner structure of the premixed burner with adjustable swirl intensity according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to one embodiment of the present invention, the burner structure of the premixed burner with adjustable swirl intensity also includes a rectifying plate, which is located between the air flow regulating port and the gas inlet in the axial direction of the outer shell, and a plurality of rectifying holes are provided on the rectifying plate, and the diameters of the plurality of rectifying holes gradually increase from the radial inner side to the radial outer side of the rectifying plate.

[0010] According to an embodiment of the present invention, a gas conduit is connected to the gas inlet, and the gas conduit extends outwardly and upwardly from the outer circumference of the shell.

[0011] According to one embodiment of the present invention, the gas conduit is 60 degrees to the axial direction of the housing.

[0012] According to one embodiment of the present invention, the air flow regulating port is connected to an air duct.

[0013] According to one embodiment of the present invention, the driving impeller includes: a wheel shaft; and a plurality of airfoil blades, wherein the plurality of airfoil blades are arranged on the wheel shaft at intervals along the circumferential direction.

[0014] According to one embodiment of the present invention, each of the airfoil blades has a first surface and a second surface relative to each other, the first surface forms a first arc line in a cross section perpendicular to the length direction of the airfoil blade, and the second surface forms a second arc line in a cross section perpendicular to the length direction of the airfoil blade, and the shapes and lengths of the first arc line and the second arc line are different.

[0015] According to one embodiment of the present invention, the number of the air flow regulating ports is plural and the ports are arranged at equal intervals along the circumference of the housing.

[0016] According to one embodiment of the present invention, there are multiple gas inlets and they are arranged at equal intervals along the circumference of the shell.

[0017] According to one embodiment of the present invention, the rotation axis of the driving impeller coincides with the rotation axis of the swirl impeller.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 3 is a schematic structural diagram of a burner structure of a premixed burner with adjustable swirl intensity according to an embodiment of the present invention.

[0021] Figure 2 3 is a schematic structural diagram of a burner structure of a premixed burner with adjustable swirl intensity according to an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the structure of the airfoil blades of the burner structure of the premixed burner with adjustable swirl intensity according to an embodiment of the present invention.

[0023] Figure 1: Burner structure 1 of a premixed burner with adjustable swirl intensity, outer casing 10, flow channel 11, air inlet 12, burner outlet 13, air flow regulating port 14, gas inlet 15, driving impeller 20, wheel shaft 21, airfoil blade 22, first surface 221, second surface 222, swirl impeller 30, speed change device 40, rectifying plate 50, rectifying hole 51, gas duct 60, air duct 70. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The burner structure 1 of a premix burner with adjustable swirl intensity according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0028] like Figure 1-Figure 3 As shown, the burner structure 1 of a premix burner with adjustable swirl intensity according to an embodiment of the present invention includes a housing 10 , a driving impeller 20 , a swirl impeller 30 and a speed change device 40 .

[0029] A flow channel 11 is provided in the shell 10. An air inlet 12 communicating with the flow channel 11 is provided at the upper end of the shell 10, and a burner outlet 13 communicating with the flow channel 11 is provided at the lower end (the up and down directions are shown by the arrows in the figure). An air flow regulating port 14 and a gas inlet 15 are provided on the peripheral wall of the shell 10. The air flow regulating port 14 is suitable for introducing or exhausting air, and the gas inlet 15 is located below the air flow regulating port 14 in the axial direction of the shell 10.

[0030] The driving impeller 20 is rotatably disposed in the housing 10 and is located above the air flow regulating port 14 in the axial direction of the housing 10. The driving impeller 20 is configured to rotate under the drive of the air flow entering the air inlet 12, and the rotational speed of the driving impeller 20 is adapted to change according to the flow rate of the air flow entering the air inlet 12.

[0031] The swirl impeller 30 is rotatably disposed in the housing 10 and is located below the gas inlet 15 in the axial direction of the housing 10 .

[0032] The driving impeller 20 and the swirl impeller 30 are connected by a transmission device 40 so that the swirl impeller 30 is suitable for rotating under the drive of the driving impeller 20. The speed change device 40 is configured to adjust the speed ratio of the driving impeller 20 and the swirl impeller 30.

[0033] Specifically, the speed change device 40 may be a planetary gear transmission.

[0034] The swirl impeller 30 includes a plurality of swirl blades uniformly distributed along the circumference. The swirl impeller 30 is suitable for pushing and guiding the airflow when rotating, so that the airflow rotates while flowing axially, thereby enhancing the mixing uniformity of the airflow and forming a high-temperature flue gas recirculation zone.

[0035] Air enters flow channel 11 through air inlet 12, driving impeller 20 to rotate under the influence of the airflow. Impeller 20 then drives swirl impeller 30 to rotate via speed changer 40. Gas enters through gas inlet 15 and is fully mixed with air by the rotation of swirl impeller 30. The mixed gas is then ejected through burner outlet 13 and ignited.

[0036] By controlling the air flow rate entering the air inlet 12, the rotational speed of the driving impeller 20 can be controlled, thereby controlling the rotational speed of the swirl impeller 30, and by adjusting the speed ratio of the speed change device 40, the rotational speed of the swirl impeller 30 can be further precisely controlled.

[0037] Since the air flow rate entering the flow channel 11 from the air inlet 12 needs to be adjusted according to the required rotational speed of the swirl impeller 30, there may be a situation where the air flow rate required for combustion is inconsistent with the air flow rate at the air inlet 12. By providing an air flow regulating port 14, the air flow regulating port 14 can be used to replenish air into the flow channel 11 or exhaust excess air. For example, when the air flow rate required for combustion is large, but the required rotational speed of the swirl impeller 30 is small, and the air flow rate at the air inlet 12 is small, air can be replenished into the flow channel 11 through the air flow regulating port 14; when the air flow rate required for combustion is small, the required rotational speed of the swirl impeller 30 is large, and the air flow rate at the air inlet 12 is large, the excess air in the flow channel 11 can be exhausted through the air flow regulating port 14.

[0038] According to the burner structure 1 of the premixed burner with adjustable swirl intensity according to the embodiment of the present invention, by setting a driving impeller 20, a swirl impeller 30 and a speed change device 40, the rotation speed of the driving impeller 20 can be adjusted by utilizing the change in air flow, thereby adjusting the rotation speed of the swirl impeller 30, and by adjusting the speed ratio of the speed change device 40, the rotation speed of the swirl impeller 30 can be further precisely controlled, so that the swirl impeller 30 can achieve different swirl intensities, ensuring that the optimal swirl intensity can be achieved under different load conditions, improving combustion efficiency, making combustion more complete, reducing pollutant generation, widening the range of stable combustion conditions, improving the applicability of the burner to different working conditions, and improving the flexibility of the burner.

[0039] In addition, by setting up the air flow regulating port 14, when the air flow required for combustion is inconsistent with the air flow at the air inlet 12, the air flow regulating port 14 can be used to supplement air into the flow channel 11 or discharge excess air, thereby achieving fine adjustment of the air flow under different working conditions, ensuring that the burner maintains the best combustion efficiency under different working conditions, and reducing energy waste.

[0040] Therefore, the burner structure 1 of the premixed burner with adjustable swirl intensity according to the embodiment of the present invention has the advantages of high combustion efficiency, low pollution, and strong applicability.

[0041] The burner structure 1 of a premixed burner with adjustable swirl intensity according to a specific embodiment of the present invention will be described below with reference to the accompanying drawings.

[0042] In some specific embodiments of the present invention, Figure 1-Figure 3 As shown, the burner structure 1 of a premix burner with adjustable swirl intensity according to an embodiment of the present invention includes a housing 10 , a driving impeller 20 , a swirl impeller 30 and a speed change device 40 .

[0043] Advantageously, as Figure 1 and Figure 2As shown, the burner structure 1 of the premix burner with adjustable swirl intensity further includes a rectifying plate 50, which is located axially between the air flow regulating port 14 and the gas inlet 15 of the housing 10. The rectifying plate 50 is provided with a plurality of rectifying holes 51, the diameters of which gradually increase from the radial inner side to the radial outer side of the rectifying plate 50. Specifically, the plurality of rectifying holes 51 are arranged on the rectifying plate 50 in a plurality of circles spaced apart in the radial direction of the rectifying plate 50, and each circle includes a plurality of rectifying holes 51 spaced apart along the circumference of the rectifying plate 50. Since the airflow will be disturbed by the driving impeller 20 after passing through the driving impeller 20, resulting in uneven flow rate, by setting the rectifying plate 50, the airflow can be made to pass through the rectifying holes 51 on the rectifying plate 50 respectively, thereby rectifying the airflow. Since the diameter of the rectifying holes 51 gradually increases from the radial inside to the radial outside of the rectifying plate 50, the distribution and flow rate of the airflow in the flow channel 11 can be made more uniform, so that the air and gas can be more fully mixed, further improving the combustion efficiency.

[0044] More advantageously, if Figure 1 and Figure 2 As shown, the gas inlet 15 is connected to a gas conduit 60, which extends outward and upward from the outer circumference of the housing 10. This allows the gas conduit 60 to guide the incoming gas flow, making the gas flow oblique to the air flow, reducing the impact of the gas flow on the rectified air flow, and achieving more uniform distribution of the gas and air, thereby further promoting more thorough mixing of the gas and air.

[0045] Alternatively, as Figure 1 and Figure 2 As shown, the gas conduit 60 is 60 degrees to the axial direction of the housing 10. This allows the gas flow and the air flow to have a reasonable angle, further reducing the impact of the gas flow on the rectified air flow and further improving the uniformity of the gas and air mixing.

[0046] Specifically, if Figure 1 and Figure 2 As shown, an air conduit 70 is connected to the air flow regulating port 14. This makes it easy to introduce air into the flow channel 11 or to exhaust excess air.

[0047] Figure 1-Figure 3 FIG. 1 shows a burner structure 1 of a premix burner with adjustable swirl intensity according to an embodiment of the present invention. Figure 1-Figure 3 As shown, the driving impeller 20 includes a shaft 21 and a plurality of airfoil blades 22. The plurality of airfoil blades 22 are circumferentially spaced apart on the shaft 21. The use of the airfoil blades facilitates changing the rotational speed of the driving impeller 20 under different air flow rates, thereby causing the swirl impeller 30 to rotate at different speeds and achieve different swirl effects.

[0048] Specifically, if Figure 3 As shown, each airfoil blade 22 has a first surface 221 and a second surface 222 relative to each other. The first surface 221 forms a first arc in a cross section perpendicular to the length of the airfoil blade 22, and the second surface 222 forms a second arc in a cross section perpendicular to the length of the airfoil blade 22. The first arc and the second arc have different shapes and lengths. This makes the two surfaces of the airfoil blade 22 asymmetric, so that the flow rate of the airflow passing through the two surfaces of the airfoil blade 22 is different. According to Bernoulli's principle, the pressure is low where the flow rate is high, and the pressure is high where the flow rate is low. Therefore, one side of the airfoil blade 22 will be subjected to a smaller pressure, while the other side will be subjected to a larger pressure, thereby prompting the driving impeller 20 to rotate, thereby facilitating the driving impeller 20 to rotate at different speeds under the control of different airflow rates.

[0049] More specifically, if Figure 1 and Figure 2 As shown, there are multiple air flow regulating ports 14 that are evenly spaced along the circumference of the housing 10. This allows for more uniform air replenishment and discharge, further improving the uniformity of air distribution within the flow channel 11 and facilitating full mixing of gas and air.

[0050] Furthermore, if Figure 1 and Figure 2 As shown, there are multiple gas inlets 15 and they are evenly spaced along the circumference of the housing 10. This makes the gas more evenly distributed in the flow channel 11, facilitating full mixing of the gas and air.

[0051] Alternatively, as Figure 1 and Figure 2 As shown, the rotation axis of the driving impeller 20 coincides with the rotation axis of the swirl impeller 30. This can facilitate the transmission connection between the driving impeller 20 and the swirl impeller 30, and can also make the gas distribution in the flow channel 11 more uniform, further facilitating the full mixing of gas and air.

[0052] Other structures and operations of the burner structure 1 of the premixed burner with adjustable swirl intensity according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0053] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and application of the present application. Numerous modifications, changes, variations, substitutions, and equivalents will occur to those skilled in the art without departing from the spirit and scope of the present application as defined by the following claims and their equivalents.

Claims

1. A burner structure of a premix burner with adjustable swirl intensity, characterized in that: include: a housing having a flow passage therein, an air inlet communicating with the flow passage being provided at an upper end of the housing and a burner outlet communicating with the flow passage being provided at a lower end of the housing, an air flow regulating port and a gas inlet being provided on a peripheral wall of the housing, the air flow regulating port being adapted to admit or exhaust air, the gas inlet being located below the air flow regulating port in an axial direction of the housing; a driving impeller rotatably disposed within the housing and located above the air flow regulating port in the axial direction of the housing, the driving impeller being configured to rotate under the drive of the air flow entering the air inlet, and having a rotational speed adapted to vary according to the flow rate of the air flow entering the air inlet; a swirl impeller rotatably disposed in the housing and located below the gas inlet in the axial direction of the housing; A speed change device is provided, wherein the driving impeller and the swirl impeller are connected in transmission via the speed change device so that the swirl impeller is adapted to rotate under the drive of the driving impeller, and the speed change device is configured to adjust the speed ratio between the driving impeller and the swirl impeller.

2. The burner structure of the premix burner with adjustable swirl intensity according to claim 1, characterized in that: It also includes a rectifying plate, which is located between the air flow regulating port and the gas inlet in the axial direction of the shell. A plurality of rectifying holes are provided on the rectifying plate, and the diameters of the plurality of rectifying holes gradually increase from the radial inner side to the radial outer side of the rectifying plate.

3. The burner structure of the premix burner with adjustable swirl intensity according to claim 1, characterized in that: The gas inlet is connected to a gas conduit, and the gas conduit extends outwardly and upwardly from the outer circumference of the shell.

4. The burner structure of the premix burner with adjustable swirl intensity according to claim 3 is characterized in that: The gas conduit is 60 degrees to the axial direction of the shell.

5. The burner structure of the premix burner with adjustable swirl intensity according to claim 1 is characterized in that: The air flow regulating port is connected with an air duct.

6. The burner structure of the premix burner with adjustable swirl intensity according to claim 1, characterized in that: The driving impeller comprises: axle; A plurality of airfoil blades are arranged on the wheel shaft at intervals along the circumferential direction.

7. The burner structure of the premix burner with adjustable swirl intensity according to claim 6, characterized in that: Each of the airfoil blades has a first surface and a second surface relative to each other, the first surface forming a first arc line in a cross section perpendicular to the length direction of the airfoil blade, and the second surface forming a second arc line in a cross section perpendicular to the length direction of the airfoil blade, and the first arc line and the second arc line have different shapes and lengths.

8. The burner structure of the premix burner with adjustable swirl intensity according to claim 1, characterized in that: The air flow regulating ports are multiple and are arranged at equal intervals along the circumference of the housing.

9. The burner structure of a premix burner with adjustable swirl intensity according to claim 1, characterized in that: There are multiple gas inlets which are arranged at equal intervals along the circumference of the shell.

10. The burner structure of a premix burner with adjustable swirl intensity according to claim 1, characterized in that: The driving impeller and the swirl impeller have rotating axes that coincide with each other.

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