Burner and combustion equipment

Abstract

The present application relates to the field of equipment, and specifically, to a burner and a combustion device. The burner includes: an air intake chamber; a combustion chamber and a combustion assembly, the combustion assembly includes a porous medium and a first cooling tube connected to each other, and the combustion assembly is provided with at least one channel for the gas to pass through, and at least two side walls of each channel are first cooling tubes. The resistance of the part entering the combustion chamber through the channel for combustion is relatively small, so that the burner can quickly enter the combustion state, which solves the problem of unstable fire detection when the porous medium combustion is under a small load, and also reduces the combustion resistance. Rapid combustion simultaneously drives flameless combustion through the porous medium, and the partial combustion state of the flameless combustion through the porous medium is relatively stable. The heat provided to the outside by the porous medium combustion part stabilizes the flame of the part burning through the channel, which solves the problem of unstable flame of the part burning through the channel entering the combustion chamber.

Description

Technical Field

[0001] The present application relates to the field of equipment, and in particular, to a burner and a combustion device. Background Art

[0002] Porous medium combustion is a combustion method that adds porous medium to the burner. The burner with porous medium has three heat exchange modes: convection, heat conduction and radiation, which make the temperature of the combustion area tend to be uniform and maintain a relatively stable temperature gradient. Compared with free combustion, porous medium combustion has the advantages of high combustion rate, good combustion stability, large load adjustment range, large volume and heat accumulation intensity, small burner volume, good gas adaptability, low pollutant emission in flue gas, wide combustion limit, and combustible gas with very low calorific value.

[0003] However, porous media burners have the problem of excessive combustion resistance at low loads. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a burner and a combustion device, which is intended to improve the problem of excessive combustion resistance of existing porous medium burners at low loads.

[0005] The present application provides a burner, comprising:

[0006] Intake chamber;

[0007] a combustion chamber; and

[0008] A combustion assembly that separates the air intake chamber and the combustion chamber, the combustion assembly includes a porous medium and a first cooling tube that are connected to each other, the combustion assembly is provided with at least one channel for the fuel gas to pass through, the porous medium and the first cooling tube are both connected to the inner wall of the combustion chamber, the channel connects the air intake chamber and the combustion chamber, and at least two side walls of each of the channels are the first cooling tubes.

[0009] Part of the gas in the air intake chamber passes through the porous medium for flameless combustion in the combustion chamber, and part enters the combustion chamber through the channel for combustion. Two combustion states are formed in the entire combustion chamber. The resistance of the part entering the combustion chamber through the channel is relatively small, which allows the burner to quickly enter the combustion state. The small load reduces the combustion resistance. The rapid combustion also drives the flameless combustion through the porous medium. The partial combustion state of the flameless combustion through the porous medium is relatively stable. The heat provided to the outside by the porous medium combustion part stabilizes the flame of the part burning through the channel, which solves the problem of unstable flame of the part burning through the channel.

[0010] In some embodiments of the first aspect of the present application, the combustion assembly includes a plurality of porous media arranged at intervals, both sides of each of the porous media are connected to the first cooling tube, and there is at least one channel between two adjacent porous media.

[0011] In some embodiments of the first aspect of the present application, the combustion assembly includes a plurality of the first cooling tubes, and both sides of one of the porous media are respectively connected to one of the first cooling tubes.

[0012] In some embodiments of the first aspect of the present application, the combustion chamber is provided with a second cooling pipe.

[0013] In some embodiments of the first aspect of the present application, the second cooling tube is spaced apart from the channel, and enables the flame tongue after combustion of the gas passing through the channel to contact the second cooling tube.

[0014] In some embodiments of the first aspect of the present application, the air intake chamber and the outer jacket of the combustion chamber are provided with cooling components.

[0015] In some embodiments of the first aspect of the present application, a porous plate is provided in the air intake chamber, the porous plate is provided with a plurality of air distribution holes, and the air distribution holes extend toward the combustion chamber.

[0016] In some embodiments of the first aspect of the present application, the width of the channel is 0.5-1.5 mm.

[0017] The width of the channel is 0.5-1.5mm, which can prevent the natural gas from entering the combustion chamber through the channel for combustion due to the excessive width, resulting in unstable combustion. If the width is too large, more gas will enter the combustion chamber through the channel, resulting in less flameless combustion through the porous medium, which is not conducive to stable combustion.

[0018] In some embodiments of the first aspect of the present application, the combustion chamber is provided with a flame detector.

[0019] The present application also provides a combustion device, which includes a gas mixing chamber and the above-mentioned burner, wherein the gas mixing chamber is used to mix the fuel gas and the supporting fuel gas, and the gas mixing chamber is connected to the air inlet chamber.

[0020] The combustion equipment provided in the embodiment of the present application has a small combustion resistance, and the temperature of the entire combustion component is relatively uniform, and the combustion is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the internal structure of a burner from a first perspective provided in an embodiment of the present application is shown.

[0023] Figure 2 A schematic diagram of the internal structure of the burner provided in an embodiment of the present application from a second viewing angle is shown.

[0024] Figure 3 A schematic structural diagram of the combustion equipment provided in Example 2 of the present application is shown.

[0025] Icons: 100-burner; 110-air inlet chamber; 111-porous plate; 120-combustion assembly; 121-porous medium; 122-first cooling pipe; 123-channel; 130-combustion chamber; 131-second cooling pipe; 132-flame detector; 140-cooling assembly; 200-combustion equipment; 210-mixing chamber. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present application, it should be understood that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 directly connected, or 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 this application can be understood according to specific circumstances.

[0032] Example 1

[0033] Figure 1 FIG. 1 is a schematic diagram showing the internal structure of the burner 100 provided in the embodiment of the present application from a first perspective. Figure 1 , this embodiment provides a burner 100.

[0034] The burner 100 mainly includes an air intake chamber 110, a combustion assembly 120 and a combustion chamber 130. The combustion chamber 130 is used to divide the burner 100 into the air intake chamber 110 and the combustion chamber 130. In other words, along the direction of gas intake, the two sides of the combustion assembly 120 are the air intake chamber 110 and the combustion chamber 130. The gas enters the burner 100 through the air intake chamber 110, is ignited by the combustion assembly 120, and then burns in the combustion chamber 130.

[0035] Figure 2 A schematic diagram of the internal structure of the burner 100 provided in an embodiment of the present application is shown from a second viewing angle.

[0036] See also Figure 1 and Figure 2In the present application, the combustion assembly 120 includes a porous medium 121 and a first cooling tube 122, the porous medium 121 is connected to the first cooling tube 122; the porous medium 121 and the first cooling tube 122 are both connected to the inner wall of the combustion chamber 130, the combustion assembly 120 is provided with a channel 123, at least two side walls of the channel 123 are the first cooling tube 122; the channel 123 is for the gas to pass through, in the embodiment of the present application, the combustion assembly 120 includes three channels 123, at least two side walls of each channel 123 are the first cooling tube 122. It should be noted that in other embodiments of the present application, the number of channels 123 can be one, two, four or more, which can be set according to the size and dimensions of the burner 100.

[0037] In an embodiment of the present application, the combustion assembly 120 includes 4 porous media 121 and 8 first cooling tubes 122. In this embodiment, the material of the porous medium 121 is foamed silicon carbide, the porous medium 121 is a rectangular thin plate, and the first cooling tube 122 is fixedly connected to the porous medium 121. Both ends of each porous medium 121 along the length direction are connected to the inner wall of the combustion chamber 130, and both ends of each porous medium 121 along the width direction are connected to the first cooling tube 122; there are two first cooling tubes 122 between two adjacent porous media 121, and there is a channel 123 between the two first cooling tubes 122. The first cooling tube 122 constitutes the two ends of the channel 123, and the channel 123 can allow the gas to pass through, and then the gas is burned in the combustion chamber 130, and the gas entering the combustion chamber 130 from the channel 123 can be burned quickly, reducing the combustion resistance of the burner 100, and the first cooling tube 122 can reduce the temperature to avoid flashback.

[0038] It should be noted that, in other embodiments of the present application, the porous medium 121 may be in other shapes, for example, a circular plate, a semicircular plate, or other irregularly shaped plates, etc.

[0039] In the embodiment of the present application, the number of the porous media 121 in the combustion assembly 120 may be one or more, and the number of the first cooling tube 122 may be one or more.

[0040] The combustor 100 may include only one porous medium 121 , or may include two, three or more porous media 121 .

[0041] Accordingly, in other embodiments of the present application, the number of the first cooling tube 122 may be one, for example, the first cooling tube 122 is arranged in a plurality of S-shaped bends, the porous medium 121 is connected to the first cooling tube 122, and the channel 123 is located between the two bent sections of the first cooling tube 122. Alternatively, in some embodiments, the number of the first cooling tube 122 is multiple, and the four side walls of the channel 123 may all be the first cooling tube 122.

[0042] In the embodiment of the present application, the cooling medium in the first cooling tube 122 is water. The first cooling tube 122 is a square tube. The square tube is arranged around the porous medium 121 and connected to the porous medium 121 .

[0043] It should be noted that, in other embodiments of the present application, the cooling medium in the first cooling tube 122 may be other liquids, such as other heat conduction media such as oil.

[0044] Alternatively, in other embodiments of the present application, the first cooling tube 122 may be a tube of other shapes such as a circular tube.

[0045] The channel 123 is used for a portion of the gas to pass through. In some embodiments of the present application, the width of the channel 123 is 0.5-1.5 mm, for example, it can be 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, etc.

[0046] In this embodiment, the width of the channel 123 refers to the width of the channel 123 in a direction perpendicular to the direction in which the gas enters the combustion chamber 130 .

[0047] The width of channel 123 is 0.5-1.5 mm, which can prevent the natural gas from entering the combustion chamber 130 through channel 123 for combustion, resulting in unstable combustion due to the large width. If the width is too large, more gas will enter the combustion chamber through channel 123, resulting in a smaller portion of flameless combustion through the porous medium 121, which is not conducive to stable combustion.

[0048] In addition, first cooling pipes 122 are disposed on both sides of the channel 123 to cool the air intake chamber 110 and prevent the air intake chamber 110 from backfired when the temperature is too high and reaches the ignition point.

[0049] In summary, part of the gas in the air inlet chamber 110 passes through the porous medium 121 for flameless combustion, and part of the gas enters the combustion chamber 130 for combustion through the channel 123. Two combustion states are formed in the entire combustion chamber. The resistance of the part where the gas enters the combustion chamber 130 through the channel 123 for combustion is small, and it will not be unstable due to the large load, reducing the combustion resistance. Rapid combustion drives the flameless combustion through the porous medium 121 at the same time. The flameless combustion through the porous medium 121 is relatively stable, overcoming the instability of the part where the gas enters the combustion chamber 130 through the channel 123 for combustion.

[0050] In an embodiment of the present application, a second cooling pipe 131 is provided in the combustion chamber 130. The second cooling pipe 131 is installed in the combustion chamber 130. After the gas burns in the combustion chamber 130, the temperature in the combustion chamber 130 can be reduced by the second cooling pipe 131, thereby reducing the emission of nitrogen oxides.

[0051] In an embodiment of the present application, the second cooling tube 131 is arranged in a plurality of tube arrays in the combustion chamber 130 to increase the heat exchange area between the second cooling tube 131 and the gas in the combustion chamber 130 , thereby increasing the heat exchange effect of the second cooling tube 131 .

[0052] In other embodiments of the present application, the second cooling tube 131 may be arranged in other ways in the combustion chamber 130, and the present application does not limit the arrangement thereof.

[0053] In the embodiment of the present application, the cooling medium in the second cooling tube 131 is water. In other embodiments, the cooling medium in the second cooling tube 131 may be oil, a water-oil mixture, or other heat exchange medium. The second cooling tube 131 is a round tube. In other embodiments, the second cooling tube 131 may be a square tube, etc.

[0054] In the embodiment of the present application, the second cooling pipe 131 is located above the channel 123 in the combustion chamber 130. In other words, along the extension direction of the channel 123, the second cooling pipe 131 is located in the extension direction of the channel 123 in the combustion chamber 130. The second cooling pipe 131 intersects with the extension direction of the channel 123.

[0055] The gas enters the combustion chamber 130 through the channel 123 and then burns. The second cooling pipe 131 is located in the extension direction of the channel 123 in the combustion chamber 130 . The second cooling pipe 131 cools the flame that enters the combustion chamber 130 through the channel 123 and then burns.

[0056] In this embodiment, the second cooling tube 131 is at a certain distance from the channel 123, so that the flame entering the combustion chamber 130 through the channel 123 can contact the second cooling tube 131, thereby reducing the temperature of the flame and thus reducing the emission of nitrogen oxides.

[0057] In some embodiments of the present application, the second cooling pipe 131 is not necessary, and the second cooling pipe 131 may not be provided in the combustion chamber 130 .

[0058] Furthermore, in other embodiments of the present application, the second cooling pipe 131 may also be in other positional relationships within the combustion chamber 130 , and is not limited to being located in the extension direction of the channel 123 .

[0059] In this embodiment, a flame detector 132 is disposed in the combustion chamber 130 , and the flame detector 132 is used to detect the combustion condition in the combustion chamber 130 .

[0060] In an embodiment of the present application, the air intake chamber 110 is provided with a porous plate 111, which is installed in the air intake chamber 110. The porous plate 111 is provided with a plurality of air distribution holes, which extend toward the combustion chamber 130. In other words, the air distribution holes in the porous plate 111 can supply fuel gas to move toward the combustion chamber 130.

[0061] The gas distribution holes are distributed on the porous plate 111 , and the gas distribution holes have the function of distributing the fuel gas, so that the fuel gas can be fully burned in the combustion chamber 130 .

[0062] In this embodiment, the porous plate 111 is a porous ceramic fiber board. In other embodiments of the present application, the porous plate 111 may be made of other materials. Alternatively, in other embodiments of the present application, the porous plate 111 may not be provided.

[0063] In the present application, the air intake chamber 110 and the combustion chamber 130 are integrally arranged. The air intake chamber 110 and the combustion chamber 130 are separated by a combustion assembly 120. In the present application, the air intake chamber 110 and the combustion chamber 130 are provided with a cooling assembly 140 on the outer cover; the cooling assembly 140 can cool the air intake chamber 110 and the combustion chamber 130.

[0064] In the present application, the cooling assembly 140 is a water jacket; the cooling assembly 140 includes a shell that is sleeved outside the air intake chamber 110 and the combustion chamber 130, a cavity for cooling water to flow through is provided between the shell and the air intake chamber 110 and the combustion chamber 130, and a water inlet and a water outlet that are connected to the cavity are provided on the shell. In the present embodiment, the first cooling pipe 122 is connected to the cooling assembly 140, so that the cooling medium in the first cooling pipe 122 and the cooling medium in the cooling assembly 140 can be exchanged with each other; in other embodiments of the present application, the first cooling pipe 122 and the cooling assembly 140 can be independent of each other.

[0065] The cooling assembly 140 reduces the temperature of the periphery of the air intake chamber 110 and the combustion chamber 130 to prevent fire etc. caused by high temperature around the air intake chamber 110 and the combustion chamber 130 .

[0066] It should be noted that, in other embodiments of the present application, the cooling medium in the cooling component 140 is not limited to water, and oil or a water-oil mixture may be selected.

[0067] The cooling component 140 is not limited to the above-mentioned structure and setting method. The cooling component 140 can also be set to an air heat exchange method, etc.

[0068] The burner 100 provided in the embodiment of the present application has at least the following advantages:

[0069] The burner 100 of the present application combines two combustion modes, porous medium combustion and water-cooled premixed combustion. The channel 123 between two adjacent first cooling tubes 122 allows part of the gas to pass through, which can reduce the combustion resistance of the burner 100 and allow the gas to quickly enter the combustion state. The first cooling tube 122 can prevent the air inlet chamber 110 from having a high temperature and thus avoid flashback. The combustion of the porous medium 121 makes the entire combustion more stable and makes the temperature of the combustion part of the entire combustion assembly 120 more uniform.

[0070] The burner 100 provided in the present application has a large load ratio, and the load ratio may be greater than 1:5.

[0071] Example 2

[0072] Figure 3 The structural diagram of the combustion device 200 provided in Example 2 of the present application is shown. Figure 1 , Figure 2 as well as Figure 3 The present application also provides a combustion device 200 , which includes a gas mixing chamber 210 and the above-mentioned burner 100 . The burner 100 is described in Example 1 and will not be described in detail in this example. The gas mixing chamber 210 is connected to the air inlet chamber 110 of the burner 100 .

[0073] The gas mixing chamber 210 is mainly used to mix the fuel gas and the combustion-supporting gas. In this embodiment, the combustion-supporting gas is air, and the combustion-supporting gas is introduced by a fan. It should be noted that in other embodiments of the present application, the combustion-supporting gas may be oxygen.

[0074] The air in the mixing chamber 210 is now mixed and then transported to the burner 100 through the air intake chamber 110 for combustion, which is conducive to complete combustion.

[0075] In this embodiment, the combustion device 200 is equipped with an igniter. Accordingly, the combustion device 200 of the present application has all the advantages of the above-mentioned burner 100.

[0076] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A burner, characterized in that: The burner comprises: Air intake chamber; a combustion chamber; and A combustion assembly separating the air intake chamber and the combustion chamber, the combustion assembly comprising a porous medium and a first cooling tube connected to each other, the combustion assembly being provided with at least one channel for the fuel gas to pass through, the porous medium and the first cooling tube being connected to the inner wall of the combustion chamber, the channel communicating the air intake chamber and the combustion chamber, at least two side walls of each of the channels being the first cooling tubes; The combustion assembly includes a plurality of the first cooling tubes; the combustion assembly includes a plurality of the porous media arranged at intervals, both sides of each of the porous media are connected to the first cooling tubes, and there is at least one channel between two adjacent porous media; A portion of the gas in the air inlet chamber passes through the porous medium to be flamelessly burned in the combustion chamber, and a portion of the gas enters the combustion chamber through the channel to be burned.

2. The burner according to claim 1, characterized in that The combustion chamber is provided with a second cooling pipe.

3. The burner according to claim 2, characterized in that: The second cooling tube is spaced apart from the channel, and the flame tongue after combustion of the gas passing through the channel can contact the second cooling tube.

4. The burner according to any one of claims 1 to 3, characterized in that: The air inlet chamber and the combustion chamber outer jacket are provided with cooling components.

5. The burner according to any one of claims 1 to 3, characterized in that: A porous plate is arranged in the air intake chamber, and the porous plate is provided with a plurality of air distribution holes, and the air distribution holes extend toward the combustion chamber.

6. The burner according to any one of claims 1 to 3, characterized in that: The width of the channel is 0.5-1.5 mm.

7. The burner according to any one of claims 1 to 3, characterized in that: The combustion chamber is provided with a flame detector.

8. A combustion device, characterized in that: The combustion equipment comprises a gas mixing chamber and the burner according to any one of claims 1 to 7, wherein the gas mixing chamber is used to mix the fuel gas and the supporting fuel gas, and the gas mixing chamber is communicated with the air inlet chamber.

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