Combustor capable of preventing coking and material accumulation
By optimizing the design and material selection of the burner guide section, the problem of coking and material accumulation at the head of traditional burners has been solved, resulting in higher combustion efficiency and equipment durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional burner head structures are prone to airflow swirl during high-temperature pulverized coal or fuel injection, resulting in high-temperature stagnation zones, which in turn lead to coking and material accumulation, affecting combustion efficiency and equipment lifespan.
The design incorporates a flow guide section, with the cross-section gradually increasing and decreasing along the long axis. It combines wear-resistant and high-silicon carbide materials, and incorporates heat-resistant plates and ceramic fiber felt. Anchors are used to enhance adhesion, and airflow distribution is optimized to reduce ash retention.
It effectively avoids ash retention, extends the service life of the burner, improves operating efficiency and equipment durability, and reduces maintenance costs.
Smart Images
Figure CN224080191U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of burners, and more particularly to a burner with anti-coking and anti-coking properties. Background Technology
[0002] Traditional burners often employ cylindrical or straight-tube castable refractories for their head structure. This design, during high-temperature pulverized coal or fuel injection, easily creates airflow swirl in the burner head region, resulting in a high-temperature stagnation zone. This stagnation zone causes molten ash or impurities, such as kiln fly sand, to accumulate on the surface of the castable, forming coke and deposits. These coke and deposits not only hinder combustion efficiency and alter the flame shape but can also bend the burner, affecting its normal operation.
[0003] To address this issue, frequent shutdowns for manual cleaning are typically required, which not only increases maintenance costs but also reduces production efficiency. Furthermore, coking and material buildup can lead to uneven thermal stress distribution, causing the castable refractory to crack and detach, further shortening the equipment's lifespan. Therefore, the traditional burner head structure has significant design shortcomings and needs improvement to enhance combustion efficiency and equipment durability. Utility Model Content
[0004] This invention provides a burner with anti-coking and anti-accumulation features to solve the problem of coking and material accumulation at the head of the burner in the prior art.
[0005] This utility model provides a burner with anti-coking and anti-stacking properties, comprising:
[0006] Burner body;
[0007] A flow guide is provided at one end of the burner body, and the interior of the flow guide is in communication with the interior of the burner body. The end of the flow guide away from the burner body is provided with a port that communicates with the interior of the flow guide. The cross-section of the flow guide has a major axis and a minor axis perpendicular to the major axis. The width of the cross-section of the flow guide gradually increases and then gradually decreases along the length direction of the major axis, and the minimum width of the cross-section on one side of the minor axis is greater than the minimum width of the cross-section on the other side of the minor axis.
[0008] According to the present invention, a burner with anti-coking and anti-accumulation properties is provided, wherein the guide part located on one side of the short axis is made of a wear-resistant material, and the guide part located on the other side of the short axis is made of a high silicon carbide material.
[0009] According to the present invention, a burner with anti-coking and anti-accumulation properties is provided, wherein a plurality of heat-resistant plates are provided along the edge of the port, and the plurality of heat-resistant plates are arranged at intervals along the circumference.
[0010] According to the present invention, a burner with anti-coking and anti-accumulation properties is provided, wherein the heat-resistant plate is textured on the side opposite to the flow guide, and the roughness Ra of the side of the heat-resistant plate opposite to the flow guide is 3.2~6.3μm.
[0011] According to the present invention, a burner with anti-coking and anti-coking properties is provided, wherein the distance between two adjacent heat-resistant plates is the same.
[0012] According to the present invention, a burner with anti-coking and anti-coking properties is provided, wherein the distance between two adjacent heat-resistant plates is 7-15mm.
[0013] According to the present invention, a burner with anti-coking and anti-coking properties is provided, wherein a ceramic fiber felt is disposed between the heat-resistant plate and the flow guide.
[0014] According to the present invention, a burner with anti-coking and anti-accumulation properties is provided, wherein the flow guide and the burner body are provided with a burner inner shell, and multiple sets of anchors are provided inside the flow guide and the side wall of the burner body. The multiple sets of anchors are arranged at intervals along the length direction of the burner, and multiple anchors in the same set are arranged at intervals along the circumferential direction.
[0015] According to the present invention, a burner with anti-coking and anti-coking properties is provided, wherein the anchoring component includes:
[0016] The fastener is fixedly connected to the inner shell of the burner;
[0017] The anchor body is connected to the fastener, and the anchor body is V-shaped or U-shaped.
[0018] According to the present invention, a burner with anti-coking and anti-accumulation properties is provided, wherein the distance between two adjacent fixing members is 80-100mm.
[0019] The burner with anti-coking and anti-accumulation properties provided by this utility model gradually increases and then decreases the cross-sectional width of the guide section along the length of the long axis, and makes the minimum cross-sectional width on one side of the short axis greater than the minimum cross-sectional width on the other side of the short axis. The cross-section of the guide section forms a teardrop shape with one pointed end and the other rounded end, making the guide section streamlined overall. This reduces airflow separation and eddy current generation, avoids ash retention, and extends the service life of the burner. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the burner with anti-coking and anti-coking properties provided by this utility model.
[0022] Figure 2 This is a longitudinal cross-sectional structural diagram of the burner with anti-coking and anti-coking properties provided by this utility model.
[0023] Figure 3 This is one of the structural schematic diagrams of the anchor provided by this utility model.
[0024] Figure 4 This is the second structural schematic diagram of the anchor provided by this utility model.
[0025] Figure label:
[0026] 110. Burner body; 120. Flow guide; 130. Long shaft; 140. Short shaft; 150. Wear-resistant material; 160. High silicon carbide material; 170. Heat-resistant plate; 180. Ceramic fiber felt; 190. Anchor; 191. Fastener; 192. Anchor body; 200. Burner inner shell. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0028] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.
[0030] In this embodiment of the utility model, 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," "on top of," and "over" 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 "under" 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.
[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present 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.
[0032] The following is combined with Figures 1-4 A schematic diagram illustrating the specific structure of the burner with anti-coking and anti-coking properties according to this utility model.
[0033] Figure 1 A schematic cross-sectional view of the burner with anti-coking and anti-coking structure provided by this utility model is illustrated. Figure 2 A longitudinal cross-sectional structural diagram of the burner with anti-coking and anti-coking properties provided by this utility model is illustrated, as follows: Figure 1 and Figure 2 As shown, the burner with anti-coking and anti-stacking properties includes a burner body 110 and a guide section 120. The guide section 120 is located at one end of the burner body 110, and the interior of the guide section 120 is connected to the interior of the burner body 110. The end of the guide section 120 away from the burner body 110 has a port that communicates with the interior of the guide section 120. The cross-section of the guide section 120 has a major axis 130 and a minor axis 140 perpendicular to the major axis 130. The width of the cross-section of the guide section 120 gradually increases and then gradually decreases along the length direction of the major axis 130, and the minimum width of the cross-section on one side of the minor axis 140 is greater than the minimum width of the cross-section on the other side of the minor axis 140.
[0034] The burner with anti-coking and anti-accumulation properties provided by this invention features a gradually increasing and then decreasing cross-sectional width of the guide section 120 along the length of the long axis 130, while ensuring that the minimum width of the cross-section on one side of the short axis 140 is greater than that on the other side. The cross-section of the guide section 120 forms a teardrop shape with one pointed end and the other rounded end. Specifically, the cross-sectional change along the long axis 130 follows aerodynamic principles. The gradually expanding design of the guide section 120 on one side of the short axis 140 accelerates airflow and reduces the formation of static pressure zones. The gradually narrowing guide section 120 on the other side of the short axis 140 guides the airflow to transition smoothly, avoiding flow separation caused by abrupt changes in cross-section. At the same time, the difference in minimum width on both sides of the short axis 140 forms an asymmetrical structure, further optimizing the airflow distribution. This causes ash to shift towards the wider side under centrifugal force, reducing deposition on the narrower side and significantly reducing eddy current intensity, thereby effectively preventing ash retention and extending the burner's service life.
[0035] In one embodiment of this utility model, the long axis 130 extends in the vertical direction, and the short axis 140 extends in the horizontal direction. The guide portion 120 located on the side of the short axis 140 is made of a wear-resistant material 150. Specifically, as shown in... Figure 1As shown, the guide section 120 on the lower side of the short shaft 140 is cast with wear-resistant material 150. This design is to resist the scouring of high-speed airflow under high-temperature conditions. During burner operation, the guide section 120 on the lower side of the short shaft 140 is subjected to the impact of high-speed airflow, especially under high-temperature conditions, which may lead to material wear and damage. By giving the guide section 120 on the lower side of the short shaft 140 high hardness and impact resistance, it can maintain good performance under high-temperature conditions, thereby effectively extending the service life of the guide section 120.
[0036] The guide section 120, located on the other side of the short axis 140, is made of high silicon carbide material 160. Specifically, as shown... Figure 1 As shown, the guide section 120 located on the upper side of the short shaft 140 is cast from high silicon carbide material 160. High silicon carbide material 160 has high temperature resistance and chemical corrosion resistance. During burner operation, high-temperature ash may accumulate on the surface of the guide section 120, forming coke and material buildup. High silicon carbide material 160 can effectively prevent the adhesion of high-temperature ash and reduce the formation of coke and material buildup. Using high silicon carbide material 160 not only improves the operating efficiency of the burner, but also reduces equipment failures and maintenance costs caused by coking and material buildup.
[0037] In one embodiment of this utility model, a plurality of heat-resistant plates 170 are provided along the edge of the port, and the plurality of heat-resistant plates 170 are arranged at intervals along the circumference. Figure 1 As shown, eight heat-resistant plates 170 are arranged along the edge of the port. Each heat-resistant plate 170 has the same shape and size, and there is a gap between adjacent heat-resistant plates 170. The heat-resistant plates 170 are made of Cr25Ni20. Cr25Ni20 is an alloy material with excellent high-temperature resistance and oxidation resistance. This material can maintain stability and corrosion resistance in high-temperature environments, effectively resisting high-temperature oxidation and sulfidation, ensuring the reliability and durability of the heat-resistant plates 170 under long-term high-temperature operation conditions. The thickness of the heat-resistant plates 170 is 10mm. Of course, the thickness of the heat-resistant plates 170 is not limited to this; the specific thickness is determined according to actual needs. By setting heat-resistant plates 170 at the port, not only can material degradation in high-temperature environments be effectively resisted, but coking and material accumulation can also be significantly reduced, improving the overall performance and operating efficiency of the burner, significantly extending the burner's maintenance cycle, and reducing operating costs.
[0038] In one embodiment of this invention, the heat-resistant plate 170 has a textured surface on the side facing away from the flow guide 120. The texture can be arranged in various ways, and the shape of the texture at each location can be the same or different, depending on the specific needs. The roughness Ra of the side of the heat-resistant plate 170 facing away from the flow guide 120 is 3.2~6.3μm. This design helps to break the laminar boundary layer of the airflow, promotes turbulent mixing, and further reduces the adhesion and accumulation of ash.
[0039] In one embodiment of this utility model, the distance between two adjacent heat-resistant plates 170 is the same, specifically, as shown in the figure. Figure 1 As shown, each heat-resistant plate 170 is fan-shaped, and the central angle of each fan-shaped heat-resistant plate 170 is the same. This allows the eight heat-resistant plates 170 to be evenly spaced circumferentially, forming a ring-shaped metal sheet around the port. The distance between two adjacent heat-resistant plates 170 is 7-15 mm, preferably 10 mm. Because the metal plate has a high coefficient of thermal expansion, it will undergo significant thermal expansion at high temperatures. If the spacing between adjacent heat-resistant plates 170 is uneven, the metal plate may deform or even be damaged after being heated because it cannot release stress evenly. By ensuring that the distance between adjacent heat-resistant plates 170 is the same, each heat-resistant plate 170 can expand evenly when heated, avoiding stress concentration and thus extending the service life of the heat-resistant plates 170.
[0040] In one embodiment of this utility model, a ceramic fiber felt 180 is disposed between the heat-resistant plate 170 and the flow guide 120. The ceramic fiber felt 180 has a thickness of 5 mm and is disposed in at least two layers. The ceramic fiber felt 180 has excellent heat insulation performance and flexibility. By disposing of the ceramic fiber felt 180 between the heat-resistant plate 170 and the flow guide 120, heat transfer to the flow guide 120 can be effectively reduced, protecting the flow guide 120 from high temperature effects, while also providing a certain buffering effect to reduce stress caused by thermal expansion.
[0041] In one embodiment of this utility model, Figure 3 One of the structural schematic diagrams of the anchor provided by this utility model is shown. Figure 4 Example 2 shows a schematic diagram of the structure of the anchor provided by this utility model, as follows: Figures 1 to 4As shown, a burner inner shell 200 is disposed inside the flow guide 120 and the burner body 110. The burner inner shell 200 is a metal circular tube. Multiple sets of anchors 190 are disposed inside the side walls of both the flow guide 120 and the burner body 110. The multiple sets of anchors 190 are arranged at intervals along the length direction of the burner, and the distance between two adjacent sets of anchors 190 in the length direction of the burner is equal. Multiple anchors 190 in the same set are arranged at intervals along the circumference, and the distance between two adjacent anchors 190 in the circumferential direction of the burner is equal. By setting the anchors 190, the adhesion between the castable and the burner inner shell 200 is significantly increased, ensuring that the castable can firmly adhere to the burner inner shell 200 in a high-temperature environment, reducing the risk of cracking and falling off, and enhancing the durability of the burner in high-temperature and high-speed airflow environments. By arranging multiple sets of anchors 190 at intervals along the length of the burner and ensuring that the distance between adjacent sets of anchors 190 along the length of the burner is equal, the castable material of the entire burner can be uniformly stressed, thus avoiding cracking or falling off of the castable material due to local stress concentration.
[0042] In one embodiment of this utility model, the anchor 190 includes a fixing member 191 and an anchor body 192. The fixing member 191 is used to fix the anchor body 192 to the burner inner shell 200. The fixing member 191 is welded to the burner inner shell 200. Of course, the connection method between the fixing member 191 and the burner inner shell 200 is not limited to this; it can also be integrally formed or other connection methods. Preferably, the fixing member 191 is Ω-shaped. The Ω-shaped fixing member 191 can be better embedded in the castable, providing stronger adhesion and thus improving the stability of the anchor 190. Of course, the shape of the fixing member 191 is not limited to this; it can also be other shapes.
[0043] The anchor body 192 is connected to the fastener 191. Preferably, the anchor body 192 passes through the gap between the fastener 191 and the burner inner shell 200. The anchor body 192 is V-shaped or U-shaped. This shape of the anchor body 192 can effectively disperse stress and enhance the tensile and shear strength of the anchor 190. The V-shaped or U-shaped anchor body 192 can form a larger contact area with the castable, allowing the castable to adhere more firmly to the anchor body 192 after curing. This significantly enhances the adhesion between the castable and the burner inner shell 200, ensuring that the castable can adhere firmly to the burner inner shell 200 under high-temperature conditions and reducing the risk of cracking and detachment. The diameter of the anchor body 192 is 8-10 mm, and the distance between the end of the anchor body 192 away from the burner inner shell 200 and the burner inner shell 200 is 80-100 mm. The distance between two adjacent fasteners 191 is 80-100 mm. Preferably, the distance between two adjacent fasteners 191 is 90mm.
[0044] It should be noted that, since the anchor body 192 is a metal component with a large coefficient of thermal expansion, it will undergo significant volume changes due to thermal expansion under high-temperature conditions. This expansion may exert excessive pressure on the surrounding castable refractory, potentially causing it to crack or detach. To provide sufficient expansion space for the anchor body 192, a plastic cap or adhesive tape is fitted to the end of the anchor body 192 furthest from the burner inner shell 200. The plastic cap or tape occupies a certain space during casting, ensuring that the anchor body 192 has enough room to expand during high-temperature expansion.
[0045] Method for manufacturing a burner with anti-coking and anti-coking properties:
[0046] 1. Place the burner inner shell 200 horizontally and support it. Clean the outer surface of the burner inner shell 200 to remove rust, oil and dust, so that the burner inner shell 200 shows a metallic luster.
[0047] 2. A ceramic fiber felt 180 and multiple heat-resistant plates 170 are provided at the edge of the port. The ceramic fiber felt 180 is located between the heat-resistant plate 170 and the flow guide 120. The ceramic fiber felt 180 has a thickness of 5mm and is provided in one layer. Multiple heat-resistant plates 170 are arranged circumferentially at intervals. Each heat-resistant plate 170 has the same shape and size. The distance between two adjacent heat-resistant plates 170 is the same and is 10mm.
[0048] 3. Multiple sets of anchors 190 are welded to the outer surface of the burner inner shell 200. The multiple sets of anchors 190 are arranged at intervals along the length of the burner. The distance between two adjacent sets of anchors 190 in the length of the burner is equal. Multiple anchors 190 in the same set are arranged at intervals along the circumference. The distance between two adjacent anchors 190 in the circumference of the burner is equal. The fixing member 191 is welded to the burner inner shell 200, and the anchor body 192 passes through the gap between the fixing member 191 and the burner inner shell 200.
[0049] 4. Before installing the mold, apply a thin layer of oil to the inner surface of the mold to avoid adhesion; install the lower mold first, ensuring that the gap between the lower mold and the burner inner shell 200 is uniform and firmly fixed, and then set up the upper mold after the lower half is poured.
[0050] 5. First, pour the lower castable material and compact it with a vibrator. Then, lay ceramic fiber felt 180 on both sides along the axial direction. Next, set up the upper mold and continue to pour the upper castable material. Finally, trim the castable material of the guide section 120 into the upper pointed shape. After construction, cure with the mold for no less than 24 hours. After demolding, continue curing for another 24 hours. Before use, bake with charcoal.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A burner with anti-coking and anti-coking properties, characterized in that, include: Burner body (110); A flow guide (120) is disposed at one end of the burner body (110), and the interior of the flow guide (120) is connected to the interior of the burner body (110). The end of the flow guide (120) away from the burner body (110) is provided with a port that is connected to the interior of the flow guide (120). The cross-section of the flow guide (120) has a major axis (130) and a minor axis (140) perpendicular to the major axis (130). The cross-sectional width of the flow guide (120) gradually increases and then gradually decreases along the length direction of the major axis (130), and the minimum cross-sectional width on one side of the minor axis (140) is greater than the minimum cross-sectional width on the other side of the minor axis (140).
2. The burner with anti-coking and anti-stacking properties according to claim 1, characterized in that, The material of the flow guide (120) on one side of the short axis (140) is wear-resistant material (150), and the material of the flow guide (120) on the other side of the short axis (140) is high silicon carbide material (160).
3. The burner with anti-coking and anti-coking properties according to claim 2, characterized in that, The edge of the port is provided with a plurality of heat-resistant plates (170), which are arranged at intervals along the circumference.
4. The burner with anti-coking and anti-stacking properties according to claim 3, characterized in that, The heat-resistant plate (170) has a texture on the side away from the flow guide (120), and the roughness Ra of the side of the heat-resistant plate (170) away from the flow guide (120) is 3.2~6.3μm.
5. The burner with anti-coking and anti-coking properties according to claim 4, characterized in that, The distance between two adjacent heat-resistant plates (170) is the same.
6. The burner with anti-coking and anti-coking properties according to claim 4, characterized in that, The distance between two adjacent heat-resistant plates (170) is 7-15 mm.
7. The burner with anti-coking and anti-coking properties according to claim 4, characterized in that, A ceramic fiber felt (180) is provided between the heat-resistant plate (170) and the flow guide (120).
8. The burner with anti-coking and anti-coking properties according to any one of claims 1 to 7, characterized in that, The flow guide (120) and the burner body (110) are provided with a burner inner shell (200). Multiple sets of anchors (190) are provided inside the side wall of the flow guide (120) and the side wall of the burner body (110). The multiple sets of anchors (190) are arranged at intervals along the length direction of the burner, and multiple anchors (190) in the same set are arranged at intervals along the circumferential direction.
9. The burner with anti-coking and anti-coking properties according to claim 8, characterized in that, The anchor (190) includes: The fastener (191) is fixedly connected to the inner shell (200) of the burner; The anchor body (192) is connected to the fastener (191), and the anchor body (192) is V-shaped or U-shaped.
10. The burner with anti-coking and anti-stacking properties according to claim 9, characterized in that, The distance between two adjacent fasteners (191) is 80-100mm.