Spiral-flow type coal water slurry process burner
By using a swirl-type coal-water slurry burner, the problems of uneven atomization and poor corrosion resistance have been solved, improving combustion efficiency and stability, achieving high-efficiency carbon conversion and gas production, and reducing production costs.
Patent Information
- Application Number
- CN202520275724.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-20
AI Technical Summary
The existing coal-water slurry gasification process suffers from uneven atomization and poor corrosion resistance of the burners, resulting in incomplete gasification reaction, low coal conversion rate, insufficient effective gas production, low production efficiency, and high cost.
The coal-water slurry burner with a swirling structure improves the mixing method of the three flow channels by setting up a swirler and cooling water components, thereby enhancing the mixing effect of oxygen and coal-water slurry and improving combustion efficiency and stability.
It improved carbon conversion rate and effective gas production, reduced production costs, achieved efficient and clean utilization of coal resources, and enhanced equipment durability and production continuity.
Smart Images
Figure CN223892696U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal chemical technology, and in particular to a swirl-type coal-water slurry burner. Background Technology
[0002] The burner in the coal-water slurry process is a key piece of equipment in the pressurized gasification technology of coal-water slurry. Its main function is to inject oxygen and coal-water slurry into the gasifier at a certain mixing ratio and speed, so that they can be better atomized, mixed, combusted and reacted to produce syngas.
[0003] Existing coal-water slurry gasification burners have revealed numerous problems in terms of effective gas production and conversion rate during actual operation. From an atomization perspective, traditional single-nozzle coal-water slurry burners have a three-channel design, where coal slurry is premixed with central oxygen before being shear-atomized by external oxygen. Four-nozzle coal-water slurry burners primarily rely on external oxygen shearing and impact atomization, both of which suffer from uneven mixing. This also prevents the gasification reaction from proceeding fully, resulting in a large amount of coal failing to be effectively converted. This not only reduces the coal conversion rate but also makes it difficult to achieve the expected effective gas production.
[0004] Furthermore, under complex operating conditions, the burner is constantly exposed to harsh environments of high temperature, high pressure, and strong corrosion, making its head highly susceptible to wear and corrosion. As burner performance declines, the stability of the gasification reaction is disrupted, leading to significant fluctuations in coal conversion rate, effective gas yield, and quality. This not only reduces production efficiency but also increases the difficulty and cost of subsequent gas purification, severely impacting the continuity and economic viability of production. Utility Model Content
[0005] To address the aforementioned issues, this application provides a cyclone-type coal-water slurry burner, which solves the problems of low effective gas production and conversion rate by incorporating a cyclone separator.
[0006] To achieve the objectives of this application, the following technical solution is provided:
[0007] This application provides a swirl-type coal-water slurry process burner, comprising a three-channel structure; the three-channel structure, from the inside out, consists of a central oxygen channel, a coal-water slurry channel, and an outer anodized channel; the central oxygen channel, the coal-water slurry channel, and the outer anodized channel are all connected by flanges; the outer side of the outer anodized channel is a cooling water assembly;
[0008] A central oxygen cyclone separator is fixed to the inner wall of the central oxygen channel. The central oxygen cyclone separator includes a cyclone support and a first cyclone vane. The cyclone support is cylindrical, with one end away from the burner head being conical. The first cyclone vane is a curved surface formed by stretching a first end face along a curve, and its first adjacent side is fixedly connected to the cyclone support. The cooling water assembly is a cooling water jacket or a cooling water coil.
[0009] In one possible implementation, a first coal slurry hydrocyclone is provided on the inner wall of the coal-water slurry channel. The first coal slurry hydrocyclone includes a second slurry vane. The second slurry vane is in the shape of a spiral strip, extends spirally along the axial direction of the central oxygen channel tube, and is fixedly connected to the outer wall of the central oxygen channel.
[0010] In one possible implementation, the first coal slurry hydrocyclone has at least one rotation.
[0011] In one possible implementation, a second coal slurry hydrocyclone may be provided on the inner wall of the coal-water slurry channel. The second coal slurry hydrocyclone includes a third swirl vane, which has the same structure as the first swirl vane and is fixedly connected to the outer wall of the central oxygen channel.
[0012] In one possible implementation, an outer epoxy hydrocyclone is provided on the inner wall of the outer epoxy channel, and the outer epoxy hydrocyclone includes a fourth hydrocyclone vane; the fourth hydrocyclone vane has the same structure as the first hydrocyclone vane and is fixedly connected to the outer wall of the coal-water slurry channel.
[0013] In one possible implementation, there are at least four swirl vanes, and the four swirl vanes are evenly distributed; the swirl angle of each swirl vane is greater than 0° and less than 90°, and the swirl angle is the angle of the space formed by taking the horizontal axis of the burner as the reference side and the second adjacent surface of the swirl vane as the other side.
[0014] In one possible implementation, the cooling water jacket layer has two layers, an inner and an outer layer, with cooling water flowing in from the inner layer and out from the outer layer; the cooling water jacket layer has a channel connecting the inner and outer layers; the inner layer of the cooling water jacket layer is connected to the cooling water inlet, and the outer layer of the cooling water jacket layer is connected to the cooling water outlet; the cooling water jacket layer is used for passing cooling water.
[0015] In one possible implementation, the cooling water coil is pipe-shaped and is arranged around the outer wall of the outer epoxy channel.
[0016] In one possible implementation, a central oxygen nozzle is provided at one end of the central oxygen channel, and a central oxygen inlet is provided at the other end of the central oxygen channel. A coal slurry nozzle and an outer epoxy nozzle are respectively provided at the ends of the coal water slurry channel and the outer epoxy channel that are in the same direction as the central oxygen nozzle. The ends of the coal water slurry channel and the outer epoxy channel that are in the same direction as the central oxygen inlet are the inlets of their respective channels.
[0017] Beneficial effects: The swirl-type coal-water slurry burner provided in this application enhances the mixing effect of oxygen and coal-water slurry by changing the three flow channels to a swirl form, thereby achieving the purpose of full mixing and combustion, improving carbon conversion rate, increasing the production of the main components carbon monoxide and hydrogen, realizing the efficient and clean utilization of coal resources, and reducing production costs. Attached Figure Description
[0018] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.
[0019] Figure 1 This is a schematic diagram of the structure of a swirl-type coal-water slurry burner provided in an embodiment of this application;
[0020] Figure 2 A partial structural schematic diagram of a swirl-type coal-water slurry burner provided in an embodiment of this application;
[0021] Figure 3 This is a schematic diagram of the structure of the central oxygen cyclone provided in the embodiments of this application;
[0022] Figure 4 A schematic left view of the central oxygen cyclone provided in an embodiment of this application;
[0023] Figure 5 This is a schematic diagram of the structure of the first swirl vane provided in an embodiment of this application;
[0024] Figure 6 This is a schematic diagram of the structure of the first coal slurry spiral flow device provided in the embodiments of this application;
[0025] Figure 7 This is a schematic diagram of the structure of the second coal slurry spiral flow device provided in the embodiments of this application;
[0026] Figure 8 A schematic left view of the second coal slurry spiral flow device provided in an embodiment of this application;
[0027] Figure 9 This is a schematic diagram showing the distribution of the second coal slurry hydrocyclone in the burner, as provided in an embodiment of this application.
[0028] Figure 10 This is a schematic diagram of the structure of the external epoxy cyclone separator provided in the embodiments of this application;
[0029] Figure 11 This is a schematic left view of an external epoxy cyclone separator provided in an embodiment of this application.
[0030] Figure 12 This is a schematic diagram of the structure of the cooling water coil provided in the embodiment of this application.
[0031] In the diagram: 1. Central oxygen inlet flange; 2. Coal slurry inlet flange; 3. External oxygen inlet flange; 4. Cooling water inlet flange; 5. Burner mounting flange; 6. External epoxy hydrocyclone; 7. External epoxy nozzle; 8. Coal slurry nozzle; 9. Central oxygen nozzle; 10. Central oxygen hydrocyclone; 101. Hydrocyclone support; 102. First hydrocyclone vane; 1021. First end face; 1022. First adjacent side face; 11. First coal slurry hydrocyclone; 14. Cooling water outlet flange; 15. External epoxy channel; 16. Coal-water slurry channel; 17. Central oxygen channel; 18. Second coal slurry hydrocyclone; 19. Cooling water coil; 20. Premixing zone. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.
[0034] The inventors of this invention discovered that in existing coal-water slurry gasification processes, single-nozzle coal-water slurry burners have three flow channels. After premixing with coal slurry through a central oxygen source, it undergoes shear atomization through an external oxygen source. Four-nozzle coal-water slurry processes primarily utilize external oxygen for shear and impact atomization, both of which suffer from uneven mixing. Therefore, in the embodiments provided by the inventors, the three flow channels are changed to a swirling flow pattern, while premixing and shear atomization or shear and impact atomization are retained. This enhances the mixing effect of oxygen and coal-water slurry, achieving thorough mixing and combustion, thereby increasing carbon conversion rate, improving the yield of the main components carbon monoxide and hydrogen, achieving efficient and clean utilization of coal resources, and reducing production costs.
[0035] like Figures 1-12 As shown, a swirl-type coal-water slurry burner provided in this application embodiment includes a three-channel structure; the three-channel structure consists of a central oxygen channel 17, a coal-water slurry channel 16, and an outer anodized channel 15 from the inside out; the central oxygen channel 17, the coal-water slurry channel 16, and the outer anodized channel 15 are all connected by flanges; the outer side of the outer anodized channel 15 is a cooling water assembly;
[0036] A central oxygen cyclone separator 10 is fixed to the inner wall of the central oxygen channel 17. The central oxygen cyclone separator 10 includes a cyclone support 101 and a first cyclone vane 102. The cyclone support 101 is cylindrical, and its end away from the burner head is conical. The first cyclone vane 102 is a curved surface formed by stretching the first end face 1021 along a curve, and its first adjacent side face 1022 is fixedly connected to the cyclone support 101. The cooling water assembly is a cooling water jacket or a cooling water coil 19.
[0037] In the embodiments of this application, such as Figure 1 As shown, a central oxygen nozzle 9 is provided at one end of the central oxygen channel 17, and the other end of the central oxygen channel 17 is the central oxygen inlet. A coal slurry nozzle 8 and an outer epoxy nozzle 7 are respectively provided at the ends of the coal slurry channel 16 and the outer epoxy channel 15, which are in the same direction as the central oxygen nozzle 9. The ends of the coal slurry channel 16 and the outer epoxy channel 15 that are in the same direction as the central oxygen inlet are the inlets of their respective channels.
[0038] By adopting the above technical solution, the central oxygen cyclone 10 can cause the central oxygen entering the central oxygen channel 17 to swirl. The central oxygen of the swirl can be fully mixed with the coal slurry in the premixing zone 20. After being sprayed out by the central oxygen nozzle 9, it is further sheared by the external oxygen to achieve uniform mixing. At the same time, the central oxygen swirl will shorten the flame, which is suitable for gasifiers with relatively short furnaces, preventing impact on the slag outlet and protecting the furnace. The central oxygen channel 17, the coal-water slurry channel 16, and the outer annular oxygen channel 15 are connected by flanges. This connection method is conducive to the independent transportation of different media by each channel, and the flange connection facilitates installation, disassembly, and maintenance.
[0039] As a possible implementation method, such as Figure 6 As shown, a first coal slurry hydrocyclone 11 is provided on the inner wall of the coal-water slurry channel 16. The first coal slurry hydrocyclone 11 includes a second hydrocyclone blade. The second hydrocyclone blade is in the shape of a spiral strip and extends spirally along the axial direction of the central oxygen channel 17 pipe, and is fixedly connected to the outer wall of the central oxygen channel 17.
[0040] By adopting the above technical solution, the second swirl vane extends spirally along the axial direction of the central oxygen channel 17 and is fixed on the outer wall of the central oxygen channel 17. This causes the coal slurry to form a swirling flow within the coal-water slurry channel 16, which helps the coal-water slurry mix better with the central oxygen, improves the atomization effect, and thus makes combustion more complete and improves combustion performance.
[0041] As a possible implementation method, such as Figure 2 , 8 As shown in Figure 9, a second coal slurry hydrocyclone 18 may also be provided on the inner wall of the coal-water slurry channel 16. The second coal slurry hydrocyclone 18 includes a third hydrocyclone, which has the same structure as the first hydrocyclone 102 and is fixedly connected to the outer wall of the central oxygen channel 17.
[0042] It should be noted that, as Figure 1 , Figure 2 As shown, the first coal slurry hydrocyclone 11 can be arranged in the coal-water slurry channel 16. Figure 9 As shown, the second coal slurry hydrocyclone 18 can also be arranged in the coal-water slurry channel 16. Therefore, either the first coal slurry hydrocyclone 11 or the second coal slurry hydrocyclone 18 can be arranged separately in the coal-water slurry channel 16.
[0043] In this embodiment, both the first coal slurry hydrocyclone 11 and the second coal slurry hydrocyclone 18 can cause the coal slurry entering the coal-water slurry channel 16 to swirl. The swirling coal-water slurry can be fully mixed with the central oxygen before being sprayed out and then sheared by the external oxygen. This helps the coal-water slurry mix better with the central oxygen, improves the atomization effect, and thus makes combustion more complete and improves combustion performance.
[0044] In one possible implementation, such as Figure 6 As shown, the first coal slurry hydrocyclone 11 has at least one rotation.
[0045] By adopting the above technical solution and specifying the swirling curve and swirling angle, the strength and stability of the coal-water slurry swirling are ensured, further optimizing the atomization of the coal-water slurry and its mixing effect with oxygen, making the combustion process more stable and efficient.
[0046] In one possible implementation, such as Figure 1 , 2 As shown in Figures 10 and 11, an outer epoxy hydrocyclone 6 is provided on the inner wall of the outer epoxy channel 15. The outer epoxy hydrocyclone 6 includes a fourth hydrocyclone. The fourth hydrocyclone has the same structure as the first hydrocyclone 102 and is fixedly connected to the outer wall of the coal-water slurry channel 16.
[0047] By adopting the above technical solution, the premixed central oxygen and coal slurry are injected through the external oxygen, which applies a dual force of axial and radial forces, making it suitable for gasifiers with relatively coarse furnaces. The external epoxy cyclone separator 6 generates swirl in the external epoxy, promoting the mixing of the external epoxy with the coal-water slurry and central oxygen, enhancing the turbulence of combustion, making combustion more intense and complete, and improving the stability and efficiency of combustion.
[0048] It should be noted that the central oxygen cyclone 10, the first coal slurry cyclone 11, the second coal slurry cyclone 18, and the outer ring oxygen cyclone 6 in the above scheme can all be used individually in the burner.
[0049] Optionally, the central oxygen hydrocyclone 10, the first coal slurry hydrocyclone 11, and the outer annular oxygen hydrocyclone 6 can be used in pairs. Alternatively, the central oxygen hydrocyclone 10, the second coal slurry hydrocyclone 18, and the outer annular oxygen hydrocyclone 6 can also be used in pairs. For example, the central oxygen hydrocyclone 10 and the first coal slurry hydrocyclone 11 can be used together. This combination allows for more thorough premixing of the coal slurry with the central oxygen, followed by further atomization through external oxygen shearing, making it suitable for shorter gasifiers. Similarly, the outer annular oxygen hydrocyclone 6 and the first coal slurry hydrocyclone 11 can be used together. This combination allows the swirled coal slurry to be premixed with central oxygen before being sprayed out, and then thoroughly mixed through external oxygen axial shearing and radial swirling, making it suitable for relatively shorter gasifiers.
[0050] Optionally, the central oxygen cyclone 10, the first coal slurry cyclone 11, and the outer annular oxygen cyclone 6 can be used simultaneously. Alternatively, the central oxygen cyclone 10, the second coal slurry cyclone 18, and the outer annular oxygen cyclone 6 can also be used simultaneously. When all three are used simultaneously, they exert axial and radial forces on all three channels. This results in more complete mixing and atomization, making it suitable for shorter, coarser gasifiers.
[0051] It should be noted that in actual use, different solutions can be selected according to different situations to ensure that the burner and gasifier are compatible. This reduces the maintenance and repair costs of the gasifier, while improving the carbon conversion rate and the production of effective gases, namely carbon monoxide and hydrogen, thereby achieving efficient utilization of coal resources and reducing enterprise production costs.
[0052] In one possible implementation, such as Figure 4 , 8 As shown in Figure 11, there are at least four swirl vanes, and the four swirl vanes are evenly distributed; the swirl angle of each swirl vane is greater than 0° and less than 90°, and the swirl angle is the angle of the space formed by taking the horizontal axis of the burner as the reference side and the second adjacent surface of the swirl vane as the other side.
[0053] In this embodiment, the swirling effect is improved by uniformly arranging multiple swirl vanes. Various swirl angles can be used, such as 10°, 20°, 30°, 45°, etc. In this embodiment, there are also multiple possible angles, not limited to the precise angles described above and illustrated in the accompanying drawings. It should not be assumed that the specific implementation of this application is limited to these descriptions. The dimensions of the first and third swirl vanes in this embodiment, such as length, height, and angle, can be adjusted according to the burner structure and the dimensions of each channel. Optionally, the fourth swirl vane can be set to a length of 80mm, a height of 12mm, and an angle of 30°, with a total of 4, 6, 8, or 10 vanes welded to the outer wall of the coal slurry channel. Optionally, the third swirl vane can be set to a length of 80mm, a height of 41mm, and an angle of 45°, with 5 vanes welded to the outer wall of the central oxygen channel. Optionally, the central oxygen cyclone is integrally machined, with a cyclone support in the middle and a first cyclone vane on the outside. The central oxygen cyclone is 16mm high, 26mm long, and has an angle of 30°.
[0054] By adopting the above technical solution, the number and angle of the swirl vanes ensure the uniformity and stability of the fluid swirling in each channel, making the combustion process more uniform across the entire burner cross-section, avoiding incomplete or unstable combustion in certain areas, and further improving combustion performance and equipment reliability.
[0055] In one possible implementation, the cooling water jacket consists of two layers, inner and outer, with cooling water flowing in from the inner layer and out from the outer layer. A channel within the cooling water jacket connects the inner and outer layers. The inner layer of the cooling water jacket is connected to the cooling water inlet, and the outer layer is connected to the cooling water outlet. The cooling water jacket is used for the flow of cooling water. In one possible implementation, the cooling water coil 19 is pipe-shaped and surrounds the outer wall of the outer epoxy channel 15.
[0056] In the embodiments of this application, the burner uses two different cooling methods. These two different cooling methods have been disclosed before and will not be described in detail here. However, it should be noted that all the cyclones in this application can be used on coil burners or jacketed burners.
[0057] Working Principle: The coal-water slurry burner is a three-channel, premixed and externally mixed type burner, mainly composed of a central oxygen channel 17, an inner ring coal-water slurry channel 16, and an outer ring oxygen channel. During operation, the coal-water slurry and oxygen are transported to the burner front end through their respective independent channels. The central oxygen and outer ring oxygen enter the burner through their corresponding channels. When the material reaches the burner head, the high-speed flowing central and outer ring oxygen exerts a strong impact and shearing effect on the coal-water slurry. Under this powerful external force, the coal-water slurry is rapidly atomized and dispersed into extremely fine droplets. The atomized coal-water slurry mixes with oxygen to form a uniform gas-liquid-solid three-phase mixture, which is then injected into the gasifier in the form of a high-speed jet. Upon entering the gasifier, the mixture is instantly exposed to a high-temperature environment. Under high temperature, the water in the coal-water slurry evaporates rapidly, and the coal particles begin to pyrolyze, releasing volatiles. The volatiles undergo a violent combustion reaction with oxygen, generating a large amount of heat, providing the necessary high-temperature conditions for the subsequent gasification reaction. At the same time, the fixed carbon in coal undergoes a gasification reaction with water vapor, carbon dioxide, and other substances to produce combustible gases such as carbon monoxide and hydrogen. These gases mix together to form syngas, which is rich in carbon monoxide and hydrogen, and is also known as effective gas.
[0058] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.
[0059] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.
Claims
1. A swirl-type coal-water slurry burner, comprising a three-channel structure; the three-channel structure, from the inside out, consists of a central oxygen channel, a coal-water slurry channel, and an outer anodized channel; the central oxygen channel, the coal-water slurry channel, and the outer anodized channel are all connected by flanges; a cooling water assembly is located outside the outer anodized channel; characterized in that... A central oxygen cyclone separator is fixed to the inner wall of the central oxygen channel. The central oxygen cyclone separator includes a cyclone support and a first cyclone vane. The cyclone support is cylindrical, with one end away from the burner head being conical. The first cyclone vane is a curved surface formed by stretching the first end face along a curve, and its first adjacent side is fixedly connected to the cyclone support. The cooling water assembly is a cooling water jacket or a cooling water coil.
2. The swirl-type coal-water slurry burner as described in claim 1, characterized in that, The inner wall of the coal-water slurry channel is provided with a first coal slurry hydrocyclone. The first coal slurry hydrocyclone includes a second hydrocyclone blade. The second hydrocyclone blade is in the shape of a spiral strip and extends spirally along the axial direction of the central oxygen channel tube, and is fixedly connected to the outer wall of the central oxygen channel.
3. The swirl-type coal-water slurry burner according to claim 2, characterized in that, The first coal slurry hydrocyclone has at least one rotation.
4. The swirl-type coal-water slurry burner as described in claim 1, characterized in that, The inner wall of the coal-water slurry channel may also be provided with a second coal slurry hydrocyclone. The second coal slurry hydrocyclone includes a third hydrocyclone, which has the same structure as the first hydrocyclone and is fixedly connected to the outer wall of the central oxygen channel.
5. A swirl-type coal-water slurry burner as described in claim 1, characterized in that, An outer epoxy hydrocyclone is provided on the inner wall of the outer epoxy channel. The outer epoxy hydrocyclone includes a fourth hydrocyclone. The fourth hydrocyclone has the same structure as the first hydrocyclone and is fixedly connected to the outer wall of the coal-water slurry channel.
6. A swirl-type coal-water slurry burner according to claims 1, 4, and 5, characterized in that, There are at least four swirl vanes, and the four swirl vanes are evenly distributed; the swirl angle of each swirl vane is greater than 0° and less than 90°, and the swirl angle is the angle of the space formed by taking the horizontal axis of the burner as the reference side and the second adjacent surface of the swirl vane as the other side.
7. A swirl-type coal-water slurry burner according to claim 1, characterized in that, The cooling water jacket consists of two layers, an inner and an outer layer, with cooling water flowing in from the inner layer and out from the outer layer. The cooling water jacket has a channel connecting the inner and outer layers. The inner layer of the cooling water jacket is connected to the cooling water inlet, and the outer layer is connected to the cooling water outlet. The cooling water jacket is used for passing cooling water.
8. A swirl-type coal-water slurry burner according to claim 1, characterized in that, The cooling water coil is pipe-shaped and is arranged around the outer wall of the outer epoxy channel.
9. A swirl-type coal-water slurry burner according to claim 1, characterized in that, A central oxygen nozzle is provided at one end of the central oxygen channel, and a central oxygen inlet is provided at the other end of the central oxygen channel. The coal-water slurry channel, the outer epoxy channel, and the end facing the same direction as the central oxygen nozzle are respectively equipped with coal slurry nozzles and outer epoxy nozzles; the end of the coal-water slurry channel and the outer epoxy channel facing the same direction as the central oxygen inlet is the inlet of their respective channels.