Gas burner

Abstract

The gas burner of the present application comprises: a combustion part having a combustion cavity, a first inlet and a first outlet communicating with the combustion cavity, the combustion part comprising a heat accumulator adjacent to the first inlet, the heat accumulator being made of heat accumulating material, and an inner wall surface of the heat accumulator constituting at least part of the combustion cavity; a first gas cyclone device arranged at the first inlet of the combustion part, the first gas cyclone device capable of making gas flow through it swirl; a primary air pipe having a second inlet and a second outlet; a plurality of secondary air pipes, each having a third inlet and a third outlet; a gas pipe having a fourth inlet and a fourth outlet, the fourth inlet being used for feeding gas, a part of the gas pipe extending into the primary air pipe, and the fourth outlet being located in the primary air pipe; and a fan blade rotatably arranged in the primary air pipe. Thus, the gas burner according to the embodiment of the present application has the advantages of facilitating low-load stable combustion and reducing gas pollution.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and more specifically to a gas burner. Background Technology

[0002] Gaseous fuels are characterized by high combustion efficiency and low pollution emissions, making them a widely used clean energy source in industrial furnaces (kilns) and boilers in industries such as power, chemical, metallurgy, and building materials. However, the main problems in the application of gas burners in related technologies are as follows: First, uneven mixing of gas and air leads to localized high-temperature points during combustion, generating thermal nitrogen oxides, making pollutant emissions difficult to control; second, there are problems with stable combustion under low loads, making it impossible to achieve adaptive stable combustion across a wide load range. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention provide a gas burner.

[0004] The gas burner of this invention includes:

[0005] The combustion section has a combustion chamber and a first inlet and a first outlet communicating with the combustion chamber. The combustion section includes a heat storage body adjacent to the first inlet. The heat storage body is made of a heat storage material, and the inner wall surface of the heat storage body forms at least a portion of the combustion chamber.

[0006] A first gas swirler is provided at the first inlet of the combustion section, and the first gas swirler enables the gas passing through it to swirl.

[0007] A primary air duct, wherein the primary air duct has a second inlet and a second outlet, the second inlet being used to introduce primary air, and the second outlet being connected to the first inlet;

[0008] Multiple secondary air ducts, each of which has a third inlet and a third outlet, wherein the third inlet is used to introduce secondary air and the third outlet is connected to the first inlet;

[0009] A gas pipeline having a fourth inlet and a fourth outlet, the fourth inlet being used to introduce gas, a portion of the gas pipeline extending into the primary air duct, and the fourth outlet being located within the primary air duct;

[0010] A fan blade is rotatably disposed within the primary air duct. The direction of extension of the rotation axis of the fan blade is consistent with the direction of extension of at least a portion of the primary air duct. The fan blade is adjacent to the second outlet in the direction of extension of the primary air duct. When the fan blade rotates, it can turbulentize the primary air and the gas.

[0011] Therefore, the gas burner according to embodiments of the present invention has the advantages of facilitating stable combustion under low load and reducing gas pollution.

[0012] In some embodiments, the primary air duct extends along a first direction, and one end of the primary air duct in the first direction is open to form a second outlet;

[0013] The gas pipeline extends along the first direction, and the first end of the gas pipeline in the first direction extends into the primary air duct. There are multiple fourth outlets, which are opened at the first end of the gas pipeline. At least some of the multiple fourth outlets are oriented in a second direction, which forms an angle with the first direction.

[0014] In some embodiments, the second direction is perpendicular to the first direction;

[0015] The plurality of fourth outlets are opened on the periphery of the first end of the gas pipeline, and the plurality of fourth outlets form multiple rings of gas outlets spaced apart in the first direction, each ring of gas outlets including a plurality of fourth outlets spaced apart in the circumferential direction.

[0016] In some embodiments, the primary air duct is provided with a flow equalization grid, the thickness direction of the flow equalization grid is a first direction, and the flow equalization grid divides the primary air duct into an air inlet chamber and a mixing chamber;

[0017] The flow equalization grid has multiple flow equalization holes that penetrate it, and the second inlet, the air intake chamber, the flow equalization holes, the mixing chamber and the second outlet are connected in sequence;

[0018] The first end of the gas pipeline passes through the flow equalization grid and extends into the mixing chamber;

[0019] The fan blades are located inside the mixing chamber.

[0020] In some embodiments, the fan blade is rotatably disposed on the first end of the gas pipeline via a bearing, the fan blade is located between the gas pipeline and the second outlet in the first direction, and the fan blade includes a plurality of blades arranged in its circumferential direction.

[0021] In some embodiments, there are multiple fan blades, and the multiple fan blades are spaced apart in the first direction;

[0022] And / or, each of the fan blades includes a plurality of sub-fan blades, the plurality of sub-fan blades being arranged radially in the primary air duct.

[0023] In some embodiments, the extension direction of each of the secondary air ducts is the first direction;

[0024] Multiple secondary air ducts are arranged at intervals from the inside to the outside, and the innermost type of the multiple secondary air ducts is arranged around the periphery of the primary air duct.

[0025] Each of the secondary air ducts is equipped with a flow regulating valve at its third inlet.

[0026] In some embodiments, the heat storage body is annular, the axial direction of the heat storage body is the first direction, the inner diameter of the heat storage body is greater than or equal to the diameter of the first inlet, and the inner diameter of the heat storage body increases in the first direction away from the first inlet.

[0027] The gas burner of this embodiment of the invention further includes a burnout air duct, which is arranged around the periphery of the combustion section. The burnout air duct has a fifth inlet and a fifth outlet. The fifth inlet is used to introduce burnout air, and the fifth outlet is connected to the combustion chamber. The fifth outlet is adjacent to the first outlet in the first direction.

[0028] In some embodiments, the fifth outlet is annular and has a second gas cyclone separator that allows gas passing through it to swirl. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a gas burner according to an embodiment of the present invention.

[0030] Figure label:

[0031] Combustion chamber 1, first inlet 11, heat storage body 12, first gas cyclone separator 13, second gas cyclone separator 14, first outlet 15;

[0032] Primary air duct 2, second inlet 21, second outlet 22, air intake chamber 23, mixing chamber 24;

[0033] Secondary air duct 3, third inlet 31, third outlet 32;

[0034] Gas pipeline 4, fourth inlet 41, fourth outlet 42, first end 43;

[0035] Burnout air duct 5, fifth inlet 51, fifth outlet 52;

[0036] Wind blade 6;

[0037] Flow equalization grid 7. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The gas burner of the present invention will now be described with reference to the accompanying drawings. Figure 1 As shown, the gas burner according to an embodiment of the present invention includes a combustion section, a first gas cyclone separator 13, a primary air duct 2, a plurality of secondary air ducts 3, a gas pipeline 4, and a fan blade 6.

[0040] The combustion section has a combustion chamber 1 and a first inlet 11 and a first outlet 15 communicating with the combustion chamber 1. The combustion section includes a heat storage body 12 adjacent to the first inlet 11. The heat storage body 12 is made of a high-temperature heat storage material, and the inner wall surface of the heat storage body 12 forms at least a portion of the combustion chamber 1. Specifically, the first inlet 11 is used to introduce gas and air. The heat-resistant heat storage body 12 is arranged around the first inlet 11 of the combustion chamber 1 to ensure gas combustion and stable combustion of the gas burner under low load. For example, the heat storage body 12 is made of refractory brick, and the first inlet 11 is a circular opening.

[0041] A first gas swirler 13 is located at the first inlet 11 of the combustion chamber, causing the gas passing through it to swirl. Thus, when the mixture of fuel gas and air enters the combustion chamber 1 through the first inlet 11, it passes through the first gas swirler 13, causing the mixture to swirl and facilitating complete combustion. The first gas swirler 13 has swirling orifices or swirling blades. For example, the first gas swirler 13 can be a swirling air distributor, which is a disc of a certain thickness with circular holes at certain angles in its circumferential and radial directions. The swirling disc is made of a high-temperature heat storage material to ensure the ignition of the fuel gas, thereby further ensuring stable combustion of the gas burner under low load.

[0042] The primary air duct 2 has a second inlet 21 and a second outlet 22. The second inlet 21 is used to introduce primary air, and the second outlet 22 is connected to the first inlet 11. The primary air in the primary air duct 2 can enter the combustion chamber 1 through the second outlet 22 and the first inlet 11.

[0043] Each secondary air duct 3 has a third inlet 31 and a third outlet 32. The third inlet 31 is used to introduce secondary air, and the third outlet 32 ​​is connected to the first inlet 11. The secondary air in each secondary air duct 3 can enter the combustion chamber 1 through the third outlet 32 ​​and the first inlet 11.

[0044] The gas pipeline 4 has a fourth inlet 41 and a fourth outlet 42. The fourth inlet 41 is used to introduce gas, a portion of the gas pipeline 4 extends into the primary air duct 2, and the fourth outlet 42 is located within the primary air duct 2. This allows the gas to first enter the primary air duct 2 and mix with the primary air. The mixture of primary air and gas, along with the secondary air, passes through the first gas cyclone separator 13 and undergoes thorough swirl, ensuring uniform combustion of the gas and air. Simultaneously, the secondary air duct 3 has multiple sections, allowing for easy adjustment of the secondary air volume. This adjustment can be tailored to different loads, enabling adaptive adjustment of the swirl intensity of the gas burner, ensuring thorough mixing of the primary and secondary air and the gas, thereby guaranteeing stable combustion under low loads and reducing gas pollution.

[0045] The fan blade 6 is rotatably disposed inside the primary air duct 2. The extension direction of the rotation axis of the fan blade 6 is consistent with the extension direction of at least a portion of the primary air duct 2. The fan blade 6 is adjacent to the second outlet 22 in the extension direction of the primary air duct 2. When the fan blade 6 rotates, it can turbulentize the primary air and gas. Specifically, when the primary air and gas pass through the fan blade 6, the fan blade 6 can change the airflow direction of the primary air and gas, thereby turbulentizing the primary air and gas, so that the gas and primary air are fully mixed. After being mixed evenly, the gas flows through the first gas cyclone separator 13 and enters the combustion chamber, thereby ensuring stable combustion at low load and reducing gas pollution.

[0046] Therefore, the gas burner according to embodiments of the present invention has the advantages of facilitating stable combustion under low load and reducing gas pollution.

[0047] like Figure 1 As shown, the primary air duct 2 extends along a first direction, with one end of the primary air duct 2 open to form a second outlet 22. The flow direction of the primary air within the primary air duct 2 is the first direction. The first direction can be a left-right direction, as indicated by the arrows in the figure. For example, the primary air duct 2 extends in a left-right direction, and the second outlet 22 of the primary air duct 2 faces to the right.

[0048] The gas pipeline 4 extends in a first direction, and its first end 43 in the first direction extends into the primary air duct 2. For example, the gas pipeline 4 extends in a left-right direction, and its right end (first end 43) extends into the primary air duct 2.

[0049] There are multiple fourth outlets 42, which are provided on the first end 43 of the gas pipeline 4. At least a portion of the multiple fourth outlets 42 are oriented in a second direction, which forms an angle with the first direction. This allows the flow direction of the gas discharged from the at least portion of the multiple fourth outlets 42 to differ from the flow direction of the primary air, thereby causing them to disturb each other and promoting thorough mixing of the gas and primary air. For example, multiple fourth outlets 42 are provided on the end face and periphery of the first end 43.

[0050] like Figure 1 As shown, in some embodiments, the second direction is perpendicular to the first direction. Multiple fourth outlets 42 are provided around the first end 43 of the gas pipeline 4. The second direction is radial to the gas pipeline 4, and the flow direction of the gas exiting the gas pipeline 4 is radial to this direction, thereby allowing the primary airflow direction to be perpendicular to the flow direction of the gas exiting the gas pipeline 4, and the mutual disturbance between the two promotes thorough mixing.

[0051] Multiple fourth outlets 42 form multiple rings of gas outlets spaced apart in the first direction, each ring including multiple fourth outlets 42 spaced apart in the circumferential direction. This allows gas to be uniformly discharged from the circumference of the first end 43 of the gas pipe 4 so as to mix with the primary air around the circumference of the gas pipe 4.

[0052] like Figure 1 As shown, in some embodiments, a flow equalization grid 7 is provided inside the primary air duct 2. The thickness direction of the flow equalization grid 7 is a first direction, and the flow equalization grid 7 divides the primary air duct 2 into an air inlet chamber 23 and a mixing chamber 24. The flow equalization grid 7 has multiple flow equalization holes penetrating it, and the second inlet 21, the air inlet chamber 23, the flow equalization holes, the mixing chamber 24, and the second outlet 22 are sequentially connected. Therefore, after the primary air enters the air inlet chamber 23 from the second inlet 21, it can be diverted by the multiple flow equalization holes, so that the primary air entering the mixing chamber 24 is more evenly distributed. For example, the flow equalization grid 7 is a circular disc, and multiple flow equalization holes are evenly distributed on the flow equalization grid 7.

[0053] The first end 43 of the gas pipeline 4 passes through the flow equalization grid 7 and extends into the mixing chamber 24, thereby allowing the gas to be mixed with the uniformly distributed primary air, so that the primary air and gas can be fully mixed.

[0054] The fan blade 6 is located within the mixing chamber 24. Specifically, the fan blade 6 is rotatably mounted on the first end 43 (end face) of the gas pipeline 4 via bearings, so that the fan blade can be rotated when primary air and gas pass through it. The fan blade 6 is located between the gas pipeline 4 and the second outlet 22 in a first direction, and the fan blade 6 includes multiple blades arranged circumferentially thereon. For example, the axis of rotation of the fan blade 6 is located at the axis of the gas pipeline 4.

[0055] In some embodiments, there are multiple fan blades 6, which are spaced apart in a first direction; and / or, each fan blade 6 includes multiple sub-fan blades 6, which are arranged radially in the primary air duct 2.

[0056] There are multiple fan blades 6, which are spaced apart in the first direction; and / or, each fan blade 6 includes multiple sub-fan blades 6, which are arranged radially in the primary air duct 2, including: a. multiple fan blades 6, which are spaced apart in the first direction, that is, primary air and gas need to pass through multiple fan blades 6 in the first direction so that primary air and gas can be fully mixed; b. each fan blade 6 includes multiple sub-fan blades, which are arranged radially in the primary air duct 2, so that each sub-fan blade can turbulentize the gas and primary air, reducing turbulence dead zones; c. multiple fan blades 6, which are spaced apart in the first direction, each fan blade 6 includes multiple sub-fan blades 6, which are arranged radially in the primary air duct 2.

[0057] like Figure 1 As shown, the extension direction of each secondary air duct 3 is the first direction. Multiple secondary air ducts 3 are arranged sequentially from the inside out, with the innermost type of secondary air duct 3 encircling the primary air duct 2. That is, the primary air duct 2 and the multiple secondary air ducts 3 are nested together sequentially. Each secondary air duct 3 has a flow regulating valve at its third inlet 31 to achieve automatic control of the secondary air volume. For example, all secondary air ducts 3 are circular pipes, and there are two secondary air ducts 3.

[0058] like Figure 1 As shown, in some embodiments, the heat storage body 12 is annular, with its axial direction being the first direction. The inner diameter of the heat storage body 12 is greater than or equal to the diameter of the first inlet 11, and the inner diameter of the heat storage body 12 increases in the first direction away from the first inlet 11. Specifically, the thickness of the heat storage body 12 decreases in the first direction away from the first inlet 11. For example, the inner and outer edges of the cross-section of the heat storage body 12 are both circular, the inner diameter of the heat storage body 12 increases to the right, and the thickness of the heat storage body 12 decreases to the right.

[0059] like Figure 1 As shown, in some embodiments, the gas burner further includes a burnout air duct 5, which is arranged around the periphery of the combustion section. The burnout air duct 5 has a fifth inlet 51 and a fifth outlet 52. The fifth inlet 51 is used to introduce burnout air, and the fifth outlet 52 is connected to the combustion chamber 1. The fifth outlet 52 is adjacent to the first outlet 15 in a first direction.

[0060] Specifically, the fifth outlet 52 is located on the side of the heat storage body 12 away from the first inlet 11 in the first direction, and the fifth outlet 52 and the first outlet 15 are connected to the staged combustion tube. The fifth outlet 52 is annular, and a second gas cyclone separator 14 is provided on the fifth outlet 52, which allows the gas passing through it to swirl. Specifically, the burnout air duct 5 is located outside the burner outlet and serves as a burnout duct. Thus, the burnout air in the burnout air duct 5 can be discharged through the second gas cyclone separator 14, and the swirling burnout air and unburned fuel gas are introduced into the staged combustion tube for thorough mixing and staged combustion, achieving low-NOx combustion. For example, the second gas cyclone separator 14 is a burnout air swirl plate. The burnout air swirl plate is arranged inside the burnout air duct 5, and the burnout air swirl plate is a ring with a certain thickness and has circular holes at a certain angle, which facilitates the swirl of the burnout air.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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 limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A gas burner, characterized in that, include: The combustion section has a combustion chamber and a first inlet and a first outlet communicating with the combustion chamber. The combustion section includes a heat storage body adjacent to the first inlet. The heat storage body is made of a heat storage material, and the inner wall surface of the heat storage body forms at least a portion of the combustion chamber. A first gas swirler is provided at the first inlet of the combustion section, and the first gas swirler enables the gas passing through it to swirl. A primary air duct has a second inlet and a second outlet. The second inlet is used to introduce primary air, and the second outlet is connected to the first inlet. The primary air duct extends along a first direction, and one end of the primary air duct in the first direction is open to form the second outlet. A flow equalization grid is provided inside the primary air duct, and the thickness direction of the flow equalization grid is the first direction. The flow equalization grid divides the primary air duct into an air inlet chamber and a mixing chamber. The flow equalization grid has a plurality of flow equalization holes penetrating it, and the second inlet, the air inlet chamber, the flow equalization holes, the mixing chamber, and the second outlet are connected in sequence. Multiple secondary air ducts, each of which has a third inlet and a third outlet, wherein the third inlet is used to introduce secondary air and the third outlet is connected to the first inlet; A gas pipeline having a fourth inlet and a fourth outlet, the fourth inlet being used to introduce gas, and the fourth outlet being located inside the primary air duct; the gas pipeline extending along a first direction, the first end of the gas pipeline in the first direction passing through the flow equalization grid and extending into the mixing chamber, the gas pipeline having multiple fourth outlets, the multiple fourth outlets being opened at the first end of the gas pipeline, at least a portion of the multiple fourth outlets being oriented in a second direction, the second direction forming an angle with the first direction; A fan blade is rotatably disposed within the primary air duct. The extension direction of the fan blade's rotation axis is consistent with the extension direction of at least a portion of the primary air duct. The fan blade is adjacent to the second outlet in the extension direction of the primary air duct. When the fan blade rotates, it can turbulentize the primary air and the gas. The fan blade is located within the mixing chamber. The fan blade is rotatably disposed on the first end of the gas pipeline via a bearing. The fan blade is located between the gas pipeline and the second outlet in the first direction. The fan blade includes a plurality of blades arranged circumferentially thereon.

2. The gas burner according to claim 1, characterized in that, The second direction is perpendicular to the first direction; The plurality of fourth outlets are opened on the periphery of the first end of the gas pipeline, and the plurality of fourth outlets form multiple rings of gas outlets spaced apart in the first direction, each ring of gas outlets including a plurality of fourth outlets spaced apart in the circumferential direction.

3. The gas burner according to claim 1, characterized in that, There are multiple fan blades, and the multiple fan blades are spaced apart in the first direction; And / or, each of the fan blades includes a plurality of sub-fan blades, the plurality of sub-fan blades being arranged radially in the primary air duct.

4. The gas burner according to claim 1, characterized in that, The extension direction of each of the secondary air ducts is the first direction; Multiple secondary air ducts are arranged at intervals from the inside to the outside, and the innermost type of the multiple secondary air ducts is arranged around the periphery of the primary air duct. Each of the secondary air ducts is equipped with a flow regulating valve at its third inlet.

5. The gas burner according to claim 1, characterized in that, The heat storage body is annular, the axis of the heat storage body is the first direction, the inner diameter of the heat storage body is greater than or equal to the diameter of the first inlet, and the inner diameter of the heat storage body increases in the first direction away from the first inlet.

6. The gas burner according to any one of claims 1-5, characterized in that, It also includes a burnout air duct, which is arranged around the periphery of the combustion section. The burnout air duct has a fifth inlet and a fifth outlet. The fifth inlet is used to introduce burnout air, and the fifth outlet is connected to the combustion chamber. The fifth outlet is adjacent to the first outlet in the first direction.

7. The gas burner according to claim 6, characterized in that, The fifth outlet is annular, and a second gas cyclone is provided on the fifth outlet, which allows the gas passing through it to swirl.

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