Linear flue burner for flue supplementary burning

Abstract

The present invention provides a linear flue burner for flue supplementary combustion, comprising a gas main pipe and at least two groups of combustion assemblies. The gas main pipe is provided with a gas inlet; at least two groups of combustion assemblies are mounted on the gas main pipe and arranged at intervals in the circumferential direction of the gas main pipe; the combustion assembly comprises a plurality of gas branch pipes and a plurality of air flow baffles; the plurality of gas branch pipes are connected to the gas main pipe and communicate with the gas main pipe, the plurality of gas branch pipes are linearly spaced along the axial direction of the gas main pipe, and each gas branch pipe is provided with a gas outlet; the plurality of air flow baffles are linearly alternately arranged with the plurality of gas branch pipes along the axial direction, and the air flow baffles are provided with air holes. According to the invention, the spatial distribution of the gas can be changed from the traditional one-dimensional axial distribution to a multi-dimensional planar distribution, so that the entire combustion is changed from the traditional linear flame to a mesh flame, thereby being able to obtain a more uniform downstream temperature distribution and low NOx emissions.

Description

Technical Field

[0001] The present invention generally relates to the technical field of burners, and more particularly to a linear flue burner for flue supplementary firing. Background Art

[0002] Existing flue burners can generate heat and heat the medium by burning the oxygen contained in the medium. Flue burners generally have fuel outlets arranged on the gas main pipe. These outlets are located at multiple locations along each flow channel, usually at equal intervals. Airflow baffles are placed on both sides of the gas main pipe to ensure sufficient mixing of the gas and the high-speed incoming flue gas, increasing the flue gas residence time. A linear combustion flame forms above the entire gas main pipe, resulting in poor temperature uniformity in the upper cross-section. Currently, this type of flue burner has the following disadvantages:

[0003] 1) The temperature deviation of the cross section downstream of the burner is large. In order to improve the temperature uniformity of the heated flue gas, it is usually necessary to add a rectifier downstream of the burner.

[0004] 2) High-temperature flame zones are easily generated, leading to high NOx emissions and large outlet temperature differences. The core factor is the uneven mixing of gas and air, which causes localized excessive flame temperatures.

[0005] 3) In narrow channels and under high power loads, the mixing of the incoming gas and the fuel gas is poor, resulting in low combustion efficiency.

[0006] 4) The flame can easily lick the flame stabilizing plate, causing it to burn out frequently, and the gas main pipe and nozzle are often burned out because the incoming flue gas cannot reach them.

[0007] Therefore, a linear flue burner for flue supplementary combustion is needed to at least partially solve the above problems. Summary of the Invention

[0008] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0009] In order to at least partially solve the above problems, the present invention provides a linear flue burner for flue supplementary combustion, comprising:

[0010] a gas main pipe provided with a gas inlet; and

[0011] At least two groups of combustion assemblies, both of which are mounted on the gas main pipe and spaced apart in the circumferential direction of the gas main pipe, the combustion assemblies comprising:

[0012] a plurality of gas branch pipes, each of which is connected to and communicates with the main gas pipe, the plurality of gas branch pipes being linearly spaced apart along the axial direction of the main gas pipe, and each of the gas branch pipes being provided with a gas outlet; and

[0013] A plurality of air flow baffles are linearly arranged along the axial direction with the plurality of gas branch pipes, and the air flow baffles are connected to the adjacent gas branch pipes, and the air flow baffles are provided with air holes.

[0014] Optionally, one of the at least two groups of combustion assemblies is located on a first side of the gas main pipe, and the other of the at least two groups of combustion assemblies is located on a second side of the gas main pipe opposite to the first side.

[0015] Optionally, the combustion assembly includes a first combustion assembly and a second combustion assembly, and the first combustion assembly and the second combustion assembly are symmetrically arranged relative to the gas main pipe.

[0016] Optionally, the combustion assembly includes a first combustion assembly and a second combustion assembly, the total number of the gas branches of the second combustion assembly is less than the total number of the gas branches of the first combustion assembly, and the gas branch of the second combustion assembly is located between two adjacent gas branches of the first combustion assembly on the opposite side thereof.

[0017] Optionally, an angle between the airflow baffle of the first combustion assembly and the airflow baffle of the second combustion assembly is 90°-180°.

[0018] Optionally, the combustion assembly includes a plurality of combustion units, each of which includes one gas branch pipe and two air flow baffles, the two air flow baffles are located on the circumferential side of the gas branch pipe and arranged opposite to each other, and the plurality of combustion units are arranged linearly along the axial direction and are detachably connected to the gas main pipe; and / or in each group of the combustion assemblies, the plurality of gas branch pipes and the plurality of air flow baffles are arranged along the radial direction of the gas main pipe, and the air flow baffles are parallel to the gas branch pipe.

[0019] Optionally, the gas branch pipe further includes a plurality of first gas branch pipes and a plurality of second gas branch pipes, wherein the plurality of first gas branch pipes are arranged at intervals along the axial direction of the gas main pipe and are connected to the gas main pipe, and a second gas branch pipe is provided on a circumferential side of each first gas branch pipe, one end of the second gas branch pipe is connected to the corresponding first gas branch pipe, and the second gas branch pipe is provided with the gas outlet.

[0020] Optionally, the air flow baffles are arranged alternately with the multiple second gas branch pipes, and the air flow baffles are connected to the adjacent second gas branch pipes; and / or in each group of the combustion assemblies, the multiple first gas branch pipes are arranged along the radial direction of the gas main pipe, and the multiple first gas branch pipes and the multiple air flow baffles are parallel to the gas main pipe.

[0021] Optionally, the combustion assembly includes multiple combustion units, each of which includes a second gas branch pipe and two air flow baffles, the two air flow baffles are located on the circumferential side of the second gas branch pipe and are arranged opposite to each other, and the multiple combustion units are respectively detachably connected to the multiple first gas branch pipes.

[0022] Optionally, in each group of the combustion assemblies, the multiple gas branch pipes are located in the same reference plane extending in the radial direction of the gas main pipe; and / or, in each group of the combustion assemblies, the spacing between adjacent gas branch pipes is equal.

[0023] Optionally, an end portion of the gas main pipe opposite to an end provided with the gas inlet is closed, and an end portion of the gas branch pipe opposite to an end connected to the gas main pipe is closed.

[0024] According to the linear flue burner for flue supplementary combustion of the present invention, two or more groups of combustion assemblies are arranged on the circumferential side of the gas main pipe, and the combustion assembly includes a plurality of gas branch pipes and a plurality of air flow baffles arranged linearly along the axial direction of the gas main pipe, so that the flue burner can be linear in the axial direction of the gas main pipe to form a linear burner. This can realize the spatial distribution of gas from the traditional one-dimensional axial distribution to a multi-dimensional planar distribution, and can match the amount of fuel required for flue gas in different spaces by setting the size and / or position of the gas outlet of the gas branch pipe, so that the entire combustion is changed from a traditional linear flame to a mesh-shaped flame, thereby achieving a more uniform downstream temperature distribution and low NOx emissions. Since the gas outlet can be arranged in a multi-dimensional plane, the advantage of high-power load combustion can be achieved even in a narrow combustion space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings of the embodiments of the present invention are hereby incorporated into the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions are used to explain the principles of the present invention. In the drawings,

[0026] Figure 1 A perspective view of a linear flue burner for flue supplementary combustion according to a first embodiment of the present invention;

[0027] Figure 2 for Figure 1 A front view of a linear flue burner is shown;

[0028] Figure 3 for Figure 1 A schematic diagram of the structure of the combustion unit;

[0029] Figure 4 for Figure 1 Schematic diagram of the structure of the gas main;

[0030] Figure 5 for Figure 1 Schematic diagram of the structure of the combustion component;

[0031] Figure 6 This is a schematic structural diagram of a gas main according to a second embodiment of the present invention;

[0032] Figure 7 This is a schematic structural diagram of a combustion assembly according to a second embodiment of the present invention;

[0033] Figure 8 This is a schematic structural diagram of a gas main according to a third embodiment of the present invention;

[0034] Figure 9 This is a schematic structural diagram of a combustion assembly according to a third embodiment of the present invention;

[0035] Figure 10 A schematic structural diagram of a portion of a flue gas treatment system according to the present invention, wherein a linear flue burner is arranged in a rectangular flue; and

[0036] Figure 11 This is a schematic structural diagram of a portion of another flue gas treatment system according to the present invention, wherein a linear flue burner is arranged in a circular flue.

[0037] Description of reference numerals:

[0038] Linear flue burner: 1 Mounting parts: 2

[0039] Ignition device: 3 Flame detection device: 4

[0040] Flange: 5 Sleeve: 6

[0041] Combustion units: 7 Gas mains: 10

[0042] Gas inlet: 11 Main pipe end: 12

[0043] First joint 13 combustion assembly: 20

[0044] First combustion component: 21 Second combustion component: 22

[0045] Gas branch pipe: 23 Air flow baffle: 24, 324

[0046] First gas outlet: 25 Second gas outlet: 26

[0047] Second junction: 27 Branch tube end: 28

[0048] Large air holes: 29 Small air holes: 30

[0049] Flue wall: 40 Gas distribution main: 50

[0050] First gas branch: 323 Second gas branch: 301 DETAILED DESCRIPTION

[0051] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with embodiments of the present invention.

[0052] In order to fully understand the embodiments of the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

[0053] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0054] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0055] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0056] Now, exemplary embodiments according to the invention will be described in more detail with reference to the accompanying drawings.

[0057] First embodiment

[0058] Figures 1 to 5 FIG. 1 shows a linear flue burner 1 for flue supplementary combustion according to a first embodiment of the present invention, which is used to heat and supplementary burn the flue gas in the flue. Figure 1 and Figure 2 As shown, a linear flue burner 1 includes a mounting component 2, a main gas pipe 10, an ignition device 3, and a flame detection device 4. The mounting component 2 can be connected to a flue wall to secure the linear flue burner 1 to the flue. The main gas pipe 10 is provided with a gas inlet 11. The main gas pipe 10 is mounted on the mounting component 2 and extends through the inside of the mounting component 2. The end of the main gas pipe 10 with the gas inlet 11 is located outside the mounting component 2, while the main body of the main gas pipe 10 is located inside the mounting component 2. Gas can enter the main gas pipe 10 through the gas inlet 11.

[0059] Both the ignition device 3 and the flame detection device 4 are disposed on the mounting member 2 and extend from the outside to the inside of the mounting member 2. The ignition device 3 is capable of igniting the gas and flue gas within the linear flue burner 1. The flame detection device 4 is capable of detecting the burning condition of the flame within the linear flue burner 1. The illustrated embodiment schematically shows an example of the mounting member 2. Optionally, the mounting member 2 may include a flange 5 and a sleeve 6 located inside the flange 5. The flange 5 is connected to the flue wall. The gas main 10 is located within the sleeve 6 and extends inwardly. Both the ignition device 3 and the flame detection device 4 are partially located within the sleeve 6.

[0060] The linear flue burner 1 may further include at least two sets of combustion assemblies 20. Each of the at least two sets of combustion assemblies 20 is mountable to the gas main 10 and spaced apart circumferentially about the gas main 10. The at least two sets of combustion assemblies 20 are located inside the mounting member 2. The number of combustion assemblies 20 may be two, three, or more sets; of course, a single set may also be provided if necessary and / or desired. The illustrated embodiment schematically illustrates the provision of two sets of combustion assemblies 20.

[0061] Each combustion assembly 20 includes multiple gas branch pipes 23 and multiple airflow baffles 24. Each of the multiple gas branch pipes 23 is connected to and communicates with the main gas pipe 10. Gas within the main gas pipe 10 can be delivered to each of the multiple gas branch pipes 23. The multiple gas branch pipes 23 are linearly spaced along the axial direction of the main gas pipe 10. The multiple airflow baffles 24 are also linearly spaced along the axial direction of the main gas pipe 10. Specifically, the multiple airflow baffles 24 are linearly spaced apart from the multiple gas branch pipes 23, with an airflow baffle 24 located between adjacent gas branch pipes 23. Each airflow baffle 24 is connected to its adjacent gas branch pipe 23.

[0062] It should be noted that the term "linear" used herein means that all components are on the same straight line or on the same plane. For example, as mentioned above, the linear arrangement of the multiple gas branch pipes 23 along the axial direction of the gas main pipe 10 means that the multiple gas branch pipes 23 are all on the same straight line extending along the axial direction of the gas main pipe 10, or on the same plane where the axial direction of the gas main pipe 10 lies.

[0063] like Figure 3 As shown, each gas branch pipe 23 is spaced apart with multiple gas outlets. Gas within the gas branch pipe 23 is ejected through the gas outlets to mix evenly with the flue gas. Each airflow baffle 24 is provided with multiple air holes, through which flue gas and / or gas can flow. The provision of multiple airflow baffles 24 ensures thorough mixing of the gas and high-speed incoming flue gas, thereby increasing the residence time of the flue gas.

[0064] According to the linear flue burner 1 of this embodiment, two or more combustion assemblies 20 are arranged on the circumferential side of the gas main pipe 10. The combustion assemblies 20 include multiple gas branch pipes 23 and multiple airflow baffles 24 arranged linearly along the axial direction of the gas main pipe 10, so that the linear flue burner 1 can be linear in the axial direction of the gas main pipe 10, forming a linear burner. This can achieve a change in the spatial distribution of the gas from the traditional one-dimensional axial distribution to a multi-dimensional planar distribution. The size and / or position of the gas outlets of the gas branch pipes 23 can be adjusted to match the amount of fuel required by the flue gas in different spaces, thereby changing the overall combustion from a traditional linear flame to a mesh-shaped flame, thereby achieving a more uniform downstream temperature distribution and low NOx emissions. Because the gas outlets can be arranged in a multi-dimensional plane, the advantages of high-power load combustion can be achieved even in a narrow combustion space.

[0065] The circumferential sides of the gas main pipe 10 can be defined as including a first side and a second side opposite the first side. One of the at least two groups of burner assemblies 20 is located on the first side of the gas main pipe 10, and the other of the at least two groups of burner assemblies 20 is located on the second side of the gas main pipe 10. It should be noted that the angle between the burner assemblies 20 located on the first side and the burner assemblies 20 located on the second side is greater than or equal to 90°.

[0066] refer to Figure 1 In each set of combustion assemblies 20, the multiple gas branch pipes 23 can be located within the same reference plane extending radially along the main gas pipe 10. In each set of combustion assemblies 20, the multiple airflow baffles 24 are arranged radially along the main gas pipe 10 and parallel to the gas branch pipes 23, so that the multiple airflow baffles 24 are located within the reference plane where the multiple gas branch pipes 23 are located. This ensures stable combustion while achieving uniform temperature distribution and low NOx emissions.

[0067] In this embodiment, the multiple gas branch pipes 23 are perpendicular to the main gas pipe 10, and the multiple airflow baffles 24 are also perpendicular to the main gas pipe 10. In other words, the multiple gas branch pipes 23 and the multiple airflow baffles 24 are arranged radially along the main gas pipe 10. Within each burner assembly 20, the spacing between adjacent gas branch pipes 23 is equal. This results in a neat overall structure, enabling more uniform temperature distribution. The main gas pipe 10's end portion 12, opposite the end with the gas inlet 11, is sealed. The branch pipe ends 28, opposite the ends connected to the main gas pipe 10, of the gas branch pipes 23 are sealed. End caps can be provided on the main gas pipe end portion 12 and the branch pipe end portion 28 to seal the ends. This allows gas to enter the gas branch pipes 23 circumferentially from the main gas pipe 10 in a distributed manner and be discharged from the multiple gas outlets of the gas branch pipes 23.

[0068] In the illustrated embodiment, Figure 1 and Figure 5 As shown, two groups of combustion assemblies 20 are provided, and the two groups of combustion assemblies 20 are located on the first and second sides of the gas main 10, respectively. Specifically, the combustion assemblies 20 include a first combustion assembly 21 and a second combustion assembly 22. The first combustion assembly 21 can be positioned opposite the second combustion assembly 22. Specifically, the first combustion assembly 21 is located on the first side of the gas main 10, and the second combustion assembly 22 is located on the second side of the gas main 10. This solution results in the linear flue burner being constructed with two rows of gas branch pipes 23 and airflow baffles 24, similar in shape to a "fishbone" burner, hence the name "fishbone" linear burner.

[0069] In this embodiment, the first combustion assembly 21 can be arranged symmetrically with the second combustion assembly 22. Specifically, the number of gas branch pipes 23 on the first combustion assembly 21 and the second combustion assembly 22 are equal and symmetrical, and the number of airflow baffles 24 on the first combustion assembly 21 and the second combustion assembly 22 are equal and symmetrical. The symmetrical arrangement of the first combustion assembly 21 and the second combustion assembly 22 can achieve a more uniform downstream temperature distribution and lower NOx emissions. The assembly structure of this embodiment is preferably suitable for situations where a relatively high temperature difference at the flue gas outlet is required.

[0070] In order to facilitate the production of the linear flue burner 1, the combustion assembly 20 may include a plurality of combustion units 7. The plurality of combustion units 7 are arranged linearly along the axial direction of the gas main 10. Figure 3As shown, the combustion unit 7 includes a gas branch pipe 23 and two air flow baffles 24. The two air flow baffles 24 are located on the circumferential sides of the gas branch pipe 23 and arranged opposite each other. More specifically, the two air flow baffles 24 are parallel and symmetrically positioned relative to the gas branch pipe 23. The air flow baffles 24 are rectangular, while the gas branch pipe 23 is cylindrical. The length of the air flow baffles 24 is parallel to the axial direction of the gas branch pipe 23. This design gives the combustion unit 7 a shape similar to that of a double wing, hence the name "wing-shaped" combustion unit 7.

[0071] Multiple combustion units 7 can be detachably connected to the gas main pipe 20. Two air flow baffles 24 are fixedly connected to the same gas branch pipe 23 to form a combustion unit 7, which facilitates the assembly and replacement of the gas branch pipe 23 and the air flow baffles 24 in a unitary form, and the assembly and replacement efficiency is higher.

[0072] The ignition process of the linear flue burner 1 is to ignite the first "wing-shaped" combustion unit 7 at the end of the gas inlet near the gas main pipe 10 through the ignition device 3, and then ignite the next combustion unit 7 in turn through the flame transfer of the previous combustion unit 7, finally realizing the ignition and combustion of the entire linear flue burner 1.

[0073] Specifically, one of the gas main pipe 10 and the gas branch pipe 23 of the combustion unit 7 is provided with a protruding first coupling portion 13 ( Figure 4 ), the other of the gas main pipe 10 and the gas branch pipe 23 of the combustion unit 7 is provided with a second joint portion 27 ( Figure 3 A portion of the first coupling portion 13 is positioned within the second coupling portion 27 and is detachably connected to the second coupling portion 27. For example, the inner wall of the second coupling portion 27 is provided with a threaded hole, and the first coupling portion 13 is provided with an external thread. The first coupling portion 13 is threadedly connected to the second coupling portion 27. By partially inserting the first coupling portion 13 into the second coupling portion 27 and threading the first coupling portion 13 and the second coupling portion 27 together, the combustion assembly 20 can be quickly installed on the gas main 10.

[0074] Multiple first joints 13 are spaced apart along the axial direction on both the first and second sides of the gas main pipe 10. The multiple first joints 13 on the first side connect to the second joints 27 of the gas branch pipe 23 of the first combustion assembly 21. The multiple first joints 13 on the second side connect to the second joints 27 of the gas branch pipe 23 of the second combustion assembly 22. The multiple first joints 13 on the first side are arranged symmetrically with the multiple first joints 13 on the second side.

[0075] The airflow baffle 24 does not contact the gas main pipe 10, and a gap of at least 2 mm is retained between the two. This not only facilitates the threaded connection of the gas branch pipe 23 and the gas main pipe 10, but also ensures that the gas main pipe 10 is flushed and cooled by upstream flue gas.

[0076] refer to Figure 1 The angle between the air flow baffle 24 of the first combustion assembly 21 and the air flow baffle 24 of the second combustion assembly 22 can be 90°-180°, for example, 90°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 180°, etc. Preferably, the angle between the air flow baffle 24 of the first combustion assembly 21 and the air flow baffle 24 of the second combustion assembly 22 is 120°-150°.

[0077] Specifically, the first joint 13 on the first side of the gas main 10 has a first axis, and the first joint 13 on the second side of the gas main 10 has a second axis. The angle between the first and second axes is 90°-180°. Therefore, during the manufacturing process, the angle between the airflow baffles 24 can be adjusted by changing the angle between the axes of the first joints 13 on both sides of the gas main 10.

[0078] Return Reference Figure 3 , multiple groups of gas outlets can be arranged at intervals along the axial direction of the gas branch pipe 23. Each group of gas outlets can be provided with multiple gas outlets, and they are arranged at intervals along the circumferential direction of the gas branch pipe 23. The angle between the center lines of adjacent gas outlets can be 30°-45°, for example, the angle is 30°, 32°, 34°, 36°, 38°, 40°, 42°, 44°, 45°, etc. The diameter of the gas outlet can be different. The aperture of the gas outlet is not less than 0.75mm to avoid clogging of the gas outlet, and the same aperture can be arranged as a whole. Optionally, the diameter of the gas outlet close to the air flow baffle 24 is smaller, and the diameter of the gas outlet away from the air flow baffle 24 is larger.

[0079] The distance between two adjacent groups of gas outlets may be different, and may be 55 mm to 125 mm, for example, 55 mm, 65 mm, 75 mm, 85 mm, 95 mm, 105 mm, 115 mm, 125 mm, etc.

[0080] Figure 3 The diagram shows that in each group of gas outlets, three gas outlets are spaced apart along the circumferential direction. Specifically, the gas outlets include a first gas outlet 25 and two second gas outlets 26. The first gas outlet 25 is located between the two second gas outlets 26. The diameter of the first gas outlet 25 is larger than that of the second gas outlet 26, and the second gas outlets 26 are symmetrically distributed on both sides of the first gas outlet 25.

[0081] Multiple groups of air holes can be spaced apart along the axial direction of the gas branch pipe 23. Each group of air holes can contain multiple air holes. The air holes can have different diameters. The air holes with larger diameters correspond to the locations of the gas outlets. Specifically, the air holes include large air holes 29 and small air holes 30. The large air holes 29 have a larger diameter than the small air holes 30. The large air holes 29 and the small air holes 30 are arranged alternately along the axial direction of the gas branch pipe 23. Two or more small air holes 30 can be provided between adjacent large air holes 29. Some of the large air holes 29 correspond to the locations of the gas outlets.

[0082] Second embodiment

[0083] Figure 6 and Figure 7 A linear flue burner according to a second embodiment of the present invention is shown. Aside from the arrangement of the combustion assembly, the linear flue burner of the second embodiment is substantially identical to the linear flue burner of the first embodiment. Therefore, components and parts identical or similar to those of the first embodiment are numeraled similarly, and for the sake of brevity, identical parts will not be described in detail.

[0084] like Figure 6 and Figure 7 The combustion assembly 20 includes a first combustion assembly 21 and a second combustion assembly 22. The total number of gas branch pipes 23 in the second combustion assembly 22 is less than the total number of gas branch pipes 23 in the first combustion assembly 21. Furthermore, the gas branch pipes 23 of the second combustion assembly 22 are located between two adjacent gas branch pipes 23 of the first combustion assembly 21 on the opposite side. In this embodiment, the gas branch pipes 23 are not arranged symmetrically on the circumferential side of the gas main pipe 10, but are staggered. This reduces the number of gas branch pipes 23 and airflow baffles 24, saving costs. This embodiment is preferably suitable for situations where the flue gas outlet temperature difference requirement is relatively low.

[0085] The total number of the first bonding parts 13 on the second side is less than the total number of the first bonding parts 13 on the first side. The first bonding parts 13 on the first side are staggered with the first bonding parts 13 on the second side.

[0086] Third embodiment

[0087] Figure 8 and Figure 9 A linear flue burner according to a third embodiment of the present invention is shown. Aside from the arrangement of the combustion assembly, the linear flue burner of the third embodiment is substantially identical to the linear flue burner of the first embodiment. Therefore, components and parts identical or similar to those of the first embodiment are numeraled similarly, and for the sake of brevity, identical parts will not be described in detail.

[0088] like Figure 8 and Figure 9The combustion assembly 20 includes a first combustion assembly 21 and a second combustion assembly 22. The gas branch pipe 23 includes multiple first gas branch pipes 323 and multiple second gas branch pipes 301. The multiple first gas branch pipes 323 are linearly spaced along the axial direction of the gas main pipe 10 and are connected to the gas main pipe 10. A second gas branch pipe 301 is provided on the circumferential side of each first gas branch pipe 323. One end of the second gas branch pipe 301 is connected to the corresponding first gas branch pipe 323, and the other end is closed, for example, with an end cap. The second gas branch pipe 301 is provided with a gas outlet. This achieves a more uniform downstream temperature distribution and low NOx emissions. The assembly structure of this embodiment is preferably suitable for situations where the flue gas outlet temperature difference requirements are relatively high.

[0089] The multiple first gas branch pipes 323 can all be perpendicular to the gas main pipe 10. In other words, the multiple first gas branch pipes 323 are all arranged along the radial direction of the gas main pipe 10. The multiple second gas branch pipes 301 and the multiple air flow baffles 324 can all be parallel to the gas main pipe 10.

[0090] Airflow baffles 324 can be arranged alternately with multiple second gas branch pipes 301, with airflow baffles 324 located between adjacent second gas branch pipes 301. Each airflow baffle 324 is connected to its adjacent second gas branch pipe 301. The combustion unit 7 can include one second gas branch pipe 301 and two airflow baffles 324. The two airflow baffles 324 are located circumferentially and oppositely to each other on the second gas branch pipe 301. More specifically, the two airflow baffles 324 are parallel and symmetrically positioned relative to the second gas branch pipe 301. The combustion units 7 can each be detachably connected to a corresponding first gas branch pipe 323. The first gas branch pipe 323 can be fixedly connected to the main gas pipe 10. This embodiment allows for easy assembly and removal of the combustion unit 7 from the first gas branch pipe 323.

[0091] Specifically, one of the first gas branch pipe 323 and the second gas branch pipe 301 of the combustion unit 7 is provided with a protruding first joint portion 13 ( Figure 8 ), the other of the first gas branch pipe 323 and the gas branch pipe 23 of the combustion unit 7 is provided with a second coupling portion 27. A portion of the first coupling portion 13 is located within the second coupling portion 27 and is detachably connected to the second coupling portion 27. As an example, the inner wall of the second coupling portion 27 is provided with a threaded hole, and the first coupling portion 13 is provided with an external thread. The first coupling portion 13 is threadedly connected to the second coupling portion 27. By partially inserting the first coupling portion 13 into the second coupling portion 27 and threading the first coupling portion 13 to the second coupling portion 27, the combustion unit 7 can be quickly installed on the first gas branch pipe 323.

[0092] The first gas branch pipe 323 is provided with multiple first joints 13 spaced apart along its axial direction. The axes of the first joints 13 are parallel to the axial direction of the main gas pipe 10. The number of first gas branch pipes 323, multiple second gas branch pipes 301, and airflow baffles 324 on both sides of the main gas pipe 10 are equal and symmetrically distributed.

[0093] According to another aspect of the present invention, a flue gas treatment system is provided, comprising a flue and a linear flue burner according to at least one of the first to third embodiments. The linear flue burner is installed in the flue. Two or more linear flue burners may be arranged in parallel.

[0094] refer to Figure 10 The linear flue burner 1 can be installed in a rectangular flue. Specifically, the flue wall 40 is configured in a rectangular shape, and two or more linear flue burners 1 are spaced apart on a plane perpendicular to the axial direction of the flue and fixed to the rectangular flue wall 40. The gas distribution main pipe 50 is configured to match the shape of the flue wall 40, that is, a rectangle; and the gas distribution main pipe 50 is connected to the gas main pipe 10 of each linear flue burner 1. Figure 10 Schematically showing three linear flue burners 1 arranged in parallel.

[0095] refer to Figure 11 The linear flue burner 1 can be installed in a circular flue. Specifically, the flue wall 40 is constructed in a circular shape, and two or more linear flue burners 1 are spaced apart on a plane perpendicular to the axial direction of the flue and fixed to the circular flue wall 40. The gas distribution main pipe 50 is constructed to match the shape of the flue wall 40, that is, it is circular; and the gas distribution main pipe 50 is connected to the gas main pipe 10 of each linear flue burner 1. Figure 11 Schematically showing four linear flue burners 1 arranged in parallel.

[0096] Of course, the linear flue burner 1 can also be installed in flues of other shapes besides rectangular and circular.

[0097] The gas main pipe 10 of the linear flue burner 1 is arranged perpendicular to the direction of flue gas flow. The incoming flue gas mixes with the gas flowing from the gas branch pipes 23 of each linear flue burner 1. Using the linear flue burner 1 of the present invention creates a vortex zone downstream of the linear flue burner 1, ensuring stable combustion of the gas.

[0098] The applicable flue gas velocity range of the linear flue burner 1 is 10-25 m / s. When a linear flue burner 1 is damaged, the combustion unit 7 can be completely removed from the flue side and the damaged parts can be partially replaced.

[0099] According to the invention, two or more combustion assemblies are arranged on the circumferential side of the gas main pipe, and the combustion assemblies include multiple gas branch pipes and multiple airflow baffles arranged in the axial direction of the gas main pipe, so that the flue burner can be arranged linearly in the axial direction of the gas main pipe, forming a linear burner. This can achieve a change in the spatial distribution of the gas from the traditional one-dimensional axial distribution to a multi-dimensional planar distribution, and can adjust the size and / or position of the gas outlets of the gas branch pipes to match the amount of fuel required by the flue gas in different spaces, thereby changing the overall combustion from the traditional linear flame to a mesh-shaped flame, thereby achieving a more uniform downstream temperature distribution and low NOx emissions. Because the gas outlets can be arranged in a multi-dimensional plane, the advantages of high-power load combustion can be achieved even in a confined combustion space.

[0100] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate component. Features described in this article in one embodiment can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0101] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will appreciate that various variations and modifications may be made based on the teachings of the present invention, and such variations and modifications fall within the scope of protection claimed in the present invention.

Claims

1. A linear flue burner for flue supplementary combustion, characterized in that: The linear flue burner comprises: a gas main pipe provided with a gas inlet; and At least two groups of combustion assemblies, both of which are mounted on the gas main pipe and spaced apart in the circumferential direction of the gas main pipe, each group of the combustion assemblies comprising: a plurality of gas branch pipes, each of which is connected to and communicates with the gas main pipe, the plurality of gas branch pipes being linearly spaced apart along the axial direction of the gas main pipe, and each of the gas branch pipes being provided with a plurality of gas outlets spaced apart along its own axial direction; and A plurality of air flow baffles are linearly arranged along the axial direction of the gas main pipe and the plurality of gas branch pipes, and the air flow baffles are connected to the adjacent gas branch pipes, and the air flow baffles are provided with air holes.

2. The linear flue burner according to claim 1, characterized in that One of the at least two groups of combustion assemblies is located on a first side of the gas main pipe, and the other of the at least two groups of combustion assemblies is located on a second side of the gas main pipe opposite to the first side.

3. The linear flue burner according to claim 1, characterized in that The combustion assembly includes a first combustion assembly and a second combustion assembly, and the first combustion assembly and the second combustion assembly are symmetrically arranged relative to the gas main pipe.

4. The linear flue burner according to claim 1, characterized in that The combustion assembly includes a first combustion assembly and a second combustion assembly, the total number of the gas branches of the second combustion assembly is less than the total number of the gas branches of the first combustion assembly, and the gas branch of the second combustion assembly is located between two adjacent gas branches of the first combustion assembly on the opposite side thereof.

5. The linear flue burner according to claim 3 or 4, characterized in that: The angle between the airflow baffle of the first combustion assembly and the airflow baffle of the second combustion assembly is 90°-180°.

6. The linear flue burner according to any one of claims 1 to 4, characterized in that The combustion assembly includes a plurality of combustion units, each of which includes a gas branch pipe and two air flow baffles. The two air flow baffles are located on the circumferential side of the gas branch pipe and arranged opposite to each other. The plurality of combustion units are linearly arranged along the axial direction of the gas main pipe and are detachably connected to the gas main pipe.

7. The linear flue burner according to any one of claims 1 to 4, characterized in that In each group of the combustion assemblies, the plurality of gas branch pipes and the plurality of air flow baffles are arranged along the radial direction of the gas main pipe, and the air flow baffles are parallel to the gas branch pipes.

8. The linear flue burner according to any one of claims 1 to 4, characterized in that The gas branch pipe further includes a plurality of first gas branch pipes and a plurality of second gas branch pipes. The plurality of first gas branch pipes are linearly spaced along the axial direction of the gas main pipe and are connected to the gas main pipe. A second gas branch pipe is provided on a circumferential side of each first gas branch pipe. One end of the second gas branch pipe is connected to the corresponding first gas branch pipe, and the second gas branch pipe is provided with the gas outlet.

9. The linear flue burner according to claim 8, characterized in that The air flow baffles are arranged alternately with the plurality of second gas branch pipes, and the air flow baffles are connected to the second gas branch pipes adjacent thereto.

10. The linear flue burner according to claim 8, characterized in that In each group of the combustion assemblies, the plurality of first gas branch pipes are arranged along the radial direction of the gas main pipe, and the plurality of first gas branch pipes and the plurality of air flow baffles are parallel to the gas main pipe.

11. The linear flue burner according to claim 8, characterized in that The combustion assembly includes multiple combustion units, each of which includes a second gas branch pipe and two air flow baffles. The two air flow baffles are located on the circumferential side of the second gas branch pipe and are arranged opposite to each other. The multiple combustion units are respectively detachably connected to the multiple first gas branch pipes.

12. The linear flue burner according to any one of claims 1 to 4, characterized in that In each group of the combustion assemblies, the plurality of gas branch pipes are located in a same reference plane extending in a radial direction of the gas main pipe.

13. The linear flue burner according to any one of claims 1 to 4, characterized in that In each group of the combustion assemblies, the distances between adjacent gas branch pipes are equal.

14. The linear flue burner according to any one of claims 1 to 4, characterized in that An end portion of the gas main pipe opposite to the end provided with the gas inlet is closed, and an end portion of the gas branch pipe opposite to the end connected to the gas main pipe is closed.

15. The linear flue burner according to any one of claims 1 to 4, characterized in that There is a gap of at least 2 mm between the air flow baffle and the gas main pipe.

16. The linear flue burner according to any one of claims 1 to 4, characterized in that The air flow baffle is provided with a plurality of groups of air holes at intervals along the axial direction of the gas branch pipe. Each group of air holes includes a plurality of air holes with different apertures. The air holes with larger apertures correspond to the positions of the gas outlets.

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