Burner structure of premixing burner capable of adjusting rotational flow intensity

Abstract

The invention discloses a burner structure of a premixing burner capable of adjusting rotational flow intensity, which comprises a shell, the shell is internally provided with a flow channel, the upper end of the shell is provided with an air inlet communicated with the flow channel, the lower end of the shell is provided with a burner outlet communicated with the flow channel, and the peripheral wall of the shell is provided with an air flow adjusting port and a gas inlet; the driving impeller is constructed to be suitable for being driven by airflow entering the air inlet to rotate, and the rotating speed of the driving impeller is suitable for changing according to the flow of the airflow entering the air inlet; the rotational flow impeller is rotatably arranged in the shell and is positioned below the fuel gas inlet in the axial direction of the shell; the driving impeller and the rotational flow impeller are in transmission connection through the speed change device, so that the rotational flow impeller is suitable for being driven by the driving impeller to rotate, and the speed change device is constructed to be suitable for adjusting the rotating speed ratio of the driving impeller to the rotational flow impeller. The burner structure of the premixing burner with the adjustable rotational flow strength has the advantages of being high in burning efficiency, small in pollution, high in applicability and the like.

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] The swirl premix burner promotes the mixing of gas and air by setting a swirler at the burner nozzle, improves the combustion efficiency, and makes the gas burn fully to reduce pollutants. However, different operating conditions have different requirements for swirl intensity. For example, when the equipment is under a small load, in order to reduce pressure loss and optimize combustion efficiency, a smaller swirl intensity should be used. When the equipment is under a large load, in order to enhance the airflow mixing effect and improve combustion efficiency, a larger swirl intensity should be used.

[0004] The premixed burner in the related technology has a swirler whose swirler is difficult to adjust the swirl intensity and it is 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, which has the advantages of high combustion efficiency, low pollution, strong applicability, etc.

[0006] To achieve the above-mentioned purpose, according to an embodiment of the present invention, a burner structure of a premixing burner with adjustable swirl intensity is provided, and the burner structure of the premixing burner with adjustable swirl intensity comprises: a shell, a flow channel is provided in the shell, an air inlet connected to the flow channel is provided at the upper end of the shell, and a burner outlet connected to the flow channel is provided at the lower end, 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 introducing 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 arranged 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 configured to rotate under the drive of the air flow entering the air inlet, and the rotation speed of the driving impeller is adapted to change according to the air flow rate entering the air inlet; a swirl impeller, 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; a speed change device, the driving impeller and the swirl impeller are transmission-connected through 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 rotation speed ratio of the driving impeller and the swirl impeller.

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

[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, the gas inlet is connected to a gas conduit, and the gas conduit extends outwardly and upwardly from the outer circumference of the shell.

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

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

[0013] According to one embodiment of the present invention, the driving impeller comprises: 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 first arc line and the second arc line have different shapes and lengths.

[0015] According to an 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 an embodiment of the present invention, the number of the gas inlets is plural and they are arranged at equal intervals along the circumference of the casing.

[0017] According to an embodiment of the present invention, the driving impeller and the rotation axis of the swirl impeller coincide with each other.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

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

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

[0023] Figure numerals: burner structure 1 of a premix 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, axle 21, airfoil blades 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] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood 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 positions or positional relationships based on the positions 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 a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the 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 clearly specified and limited, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 the premixing burner with adjustable swirl intensity according to the 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 connected to the flow channel 11 is provided at the upper end of the shell 10, and a burner outlet 13 connected to 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 letting in 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 outer casing 10 and is located above the air flow regulating port 14 in the axial direction of the outer casing 10. The driving impeller 20 is constructed to be suitable for rotating under the drive of the air flow entering the air inlet 12, and the rotation speed of the driving impeller 20 is suitable for changing according to the air flow rate 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 be suitable for adjusting 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 the flow channel 11 through the air inlet 12, and the driving impeller 20 rotates under the drive of the air flow, and the driving impeller 20 drives the swirl impeller 30 to rotate through the speed change device 40. The gas enters through the gas inlet 15, and is fully mixed with the air under the rotation of the swirl impeller 30. Finally, the mixed gas is ejected through the burner outlet 13 and ignited.

[0036] By controlling the air flow rate entering the air inlet 12, the rotation speed of the driving impeller 20 can be controlled, thereby controlling 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.

[0037] Since the air flow rate entering the flow channel 11 from the air inlet 12 needs to be adjusted according to the required rotation 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 setting the air flow regulating port 14, the air flow regulating port 14 can be used to supplement air into the flow channel 11 or discharge excess air. For example, when the air flow rate required for combustion is large, but the required rotation speed of the swirl impeller 30 is small, and the air flow rate at the air inlet 12 is small, the air can be supplemented into the flow channel 11 through the air flow regulating port 14; when the air flow rate required for combustion is small, the required rotation 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 discharged through the air flow regulating port 14.

[0038] According to the burner structure 1 of the premixing burner with adjustable swirl intensity in 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 rate, thereby adjusting the rotation speed of the swirl impeller 30, and by adjusting the rotation 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, thereby 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 conditions, and improving the flexibility of the burner.

[0039] Furthermore, by providing an 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 optimal 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, strong applicability, etc.

[0041] The burner structure 1 of a premix 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 the premixing burner with adjustable swirl intensity according to the 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, if 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 between the air flow regulating port 14 and the gas inlet 15 in the axial direction of the housing 10, and a plurality of rectifying holes 51 are provided on the rectifying plate 50, and the diameters of the plurality of rectifying holes 51 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 circumferential direction 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 velocity, 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 velocity of the airflow in the flow channel 11 can be made more uniform, so that the air and fuel gas can be more fully mixed, and the combustion efficiency can be further improved.

[0044] More advantageously, if Figure 1 and Figure 2 As shown, the gas inlet 15 is connected to a gas conduit 60, which extends outwardly and upwardly from the outer circumference of the housing 10. In this way, the gas conduit 60 can be used to guide the incoming gas flow, so that the flow direction of the gas flow is inclined to the air flow, reducing the impact of the gas flow on the rectified air flow, making the gas and air more evenly distributed, and further allowing the gas and air to be more fully mixed.

[0045] Alternatively, if 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, 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 exhaust excess air.

[0047] Figure 1-Figure 3 The burner structure 1 of the premix burner with adjustable swirl intensity according to an embodiment of the present invention is shown. Figure 1-Figure 3 As shown, the driving impeller 20 includes a wheel shaft 21 and a plurality of airfoil blades 22. The plurality of airfoil blades 22 are arranged on the wheel shaft 21 at intervals along the circumferential direction. The use of airfoil blades can facilitate the driving impeller 20 to change the rotation speed under different air flow rates, so that the swirl impeller 30 rotates at different rotation speeds to achieve different swirl effects.

[0048] Specifically, 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 direction of the airfoil blade 22, and the second surface 222 forms a second arc in a cross section perpendicular to the length direction of the airfoil blade 22. The shapes and lengths of the first arc and the second arc are different. In this way, the two surfaces of the airfoil blade 22 can be asymmetrical, so that the flow speed of the airflow passing through the two surfaces of the airfoil blade 22 is different. According to Bernoulli's principle, the pressure is small where the flow speed is large, and the pressure is large where the flow speed is small. Therefore, the surface of one side of the airfoil blade 22 will be subjected to a smaller pressure, while the surface of the other side will be subjected to a larger pressure, thereby prompting the driving impeller 20 to rotate, so that it is convenient for the driving impeller 20 to rotate at different speeds under the control of different airflow flow rates.

[0049] More specifically, Figure 1 and Figure 2 As shown, there are multiple air flow regulating ports 14 which are evenly spaced along the circumference of the housing 10. This can make the air replenishment and discharge more uniform, further improve the uniformity of air distribution in the flow channel 11, and facilitate the full mixing of gas and air.

[0050] Furthermore, if Figure 1 and Figure 2 As shown, there are multiple gas inlets 15 which 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, if Figure 1 and Figure 2 As shown, the rotation axis of the driving impeller 20 coincides with that of the swirl impeller 30. This facilitates 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 the 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 known to those skilled in the art and will not be described in detail here.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A burner structure of a premix burner with adjustable swirl intensity, characterized in that: include: A housing, wherein a flow channel is provided in the housing, an air inlet communicating with the flow channel is provided at the upper end of the housing, and a burner outlet communicating with the flow channel is provided at the lower end of the housing, an air flow regulating port and a gas inlet are provided on the peripheral wall of the housing, the air flow regulating port is suitable for introducing or exhausting air, and the gas inlet is located below the air flow regulating port in the axial direction of the housing; a driving impeller, the driving impeller being rotatably disposed in the housing and being located above the air flow regulating port in the axial direction of the housing, the driving impeller being configured to be suitable for rotating under the driving of the air flow entering the air inlet, and the rotation speed of the driving impeller being suitable for changing according to the flow rate of the air flow entering the air inlet; A swirl impeller, the swirl impeller is rotatably disposed in the housing and is located below the gas inlet in the axial direction of the housing; A speed change device, wherein the driving impeller and the swirl impeller are connected in driving connection with each other 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.

2. The burner structure of the premix burner with adjustable swirl intensity according to claim 1 is 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, and a plurality of rectifying holes are arranged 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 with 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, 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, wherein 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 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 the premix burner with adjustable swirl intensity according to claim 1, characterized in that: The gas inlets are multiple and are arranged at equal intervals along the circumference of the shell.

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

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