Biomass cyclone burner

Abstract

The utility model discloses a kind of biomass cyclone combustor, belong to burner technical field, this one kind of biomass cyclone combustor, including burner body, the one end of burner body is provided with biomass nozzle, the other end of burner body is provided with the import of biomass powder airflow, the import of biomass powder airflow is connected with external biomass powder transport system, burner body is located the one end of biomass nozzle and is provided with body cone, body cone and burner body between are provided with cyclone plate, and cyclone plate is fixedly installed on the inner wall of burner body;The present biomass cyclone combustor is arranged in the center wind cylinder of cyclone combustor by the whole burner body, without needing to reconstruct the overall structure of original cyclone combustor, only by self modularization design can be completed installation, greatly reduce the equipment reconstruction difficulty and cost, while avoiding the structural damage risk brought by water-cooling wall opening.

Description

Technical Field

[0001] This utility model relates to the field of burners, and more specifically, to a biomass swirl burner. Background Technology

[0002] Against the backdrop of energy structure transformation and increasingly stringent environmental protection requirements, biomass, as a clean and renewable energy source, often needs to be combined with swirl burners for co-combustion to replace some coal, reduce operating costs, and decrease pollutant emissions. Currently, there are two common arrangements for combining biomass burners and swirl burners: one is to install the biomass burner by opening holes in the water-cooled wall inside the burnout air box, and the other is to arrange the biomass burner inside the central duct of the swirl burner.

[0003] However, existing arrangements using perforated water-cooled walls can easily compromise the structural integrity of the water-cooled walls, increasing the risk of boiler leakage. Furthermore, the high-temperature flue gas generated by biomass combustion can cause localized corrosion of the water-cooled walls. If a conventional biomass burner is placed directly within the central duct, the lack of targeted airflow guidance and combustion stabilization structures can lead to uneven mixing of the biomass powder gas flow with the original swirl burner gas flow. This not only affects the stable combustion of biomass but may also increase nitrogen oxide emissions. Additionally, alkali metals in biomass are prone to deposit on the boiler's heating surfaces, exacerbating equipment corrosion. Furthermore, it can cause incomplete mechanical losses during pulverized coal combustion, reducing the overall combustion efficiency of the boiler. Therefore, inventing a biomass swirl burner to address these problems has become a pressing issue for those skilled in the art. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a biomass swirl burner, which aims to improve the problems of water-cooled wall opening arrangement easily damaging the structural integrity of water-cooled wall and the uneven mixing of biomass powder airflow and original swirl burner airflow caused by directly placing ordinary biomass burners in the central air duct.

[0005] This invention is achieved as follows: a biomass cyclone burner, comprising... The burner body has a biomass nozzle at one end and a biomass powder gas inlet at the other end, which is connected to an external biomass powder transport system. A swirl cone is located at one end of the burner body near the biomass nozzle, and a swirl plate is located between the swirl cone and the burner body. The swirl plate is fixedly installed on the inner wall of the burner body.

[0006] In a preferred embodiment of this utility model, the swirl plate is inclinedly arranged on the inner wall of the burner body, and the swirl plate forms a horizontal angle with the center line of the burner, the horizontal angle being 5-20°.

[0007] In a preferred embodiment of this utility model, multiple swirl plates are provided, and the multiple swirl plates are equally distributed and installed around the inner wall of the burner body.

[0008] In a preferred embodiment of this utility model, the cone-shaped body is concentrically arranged with the burner body, and the cone-shaped body is conical.

[0009] In a preferred embodiment of this utility model, the tip of the cone 3 is arc-shaped, and the included angle formed by the two sides of the cone is 5-15°.

[0010] In a preferred embodiment of this utility model, the burner body is isolated from the outside world, forming an independent space.

[0011] In a preferred embodiment of this invention, the inlet of the biomass powder airflow is a tubular channel.

[0012] The beneficial effects of this utility model are as follows: The biomass swirl burner obtained by the above design has strong structural adaptability during use: This biomass swirl burner arranges the burner body 4 as a whole in the central air duct of the swirl burner, without the need to modify the overall structure of the original swirl burner. It can be installed simply through its own modular design, which greatly reduces the difficulty and cost of equipment modification, and avoids the risk of structural damage caused by opening holes in the water-cooled wall.

[0013] High combustion stability and efficiency: The swirl plate is tilted and fixed to the inner wall of the burner body, which can make the biomass powder airflow generate a rotational motion in the same direction as the original swirl burner. Combined with the guiding effect of the conical body cone on the airflow, it can promote the full mixing of biomass powder and air. Moreover, the body cone can form a central negative pressure backflow zone when the airflow is sprayed out of the biomass nozzle, realizing flue gas rewinding, providing continuous heat for biomass powder combustion, effectively avoiding the problem of incomplete biomass combustion, and reducing the mechanical incomplete loss of pulverized coal combustion.

[0014] Excellent low-NOx and corrosion-resistant performance: By controlling the horizontal angle of the swirl plate to 5-20° and the angle of the blunt cone to 5-15°, the swirl intensity and reflux area size can be optimized, suppressing the generation of nitrogen oxides and adapting to the requirements of low-NOx combustion. In addition, the complete combustion of biomass powder can reduce the alkali metal content in unburned products, reduce the risk of alkali metal deposition and corrosion on the boiler heating surface, and extend the service life of the equipment.

[0015] High structural reliability: The burner body is an independent and enclosed space isolated from the outside world, which can effectively prevent the biomass powder gas flow from mixing with external impurities and ensure the stability of gas flow. At the same time, the tubular biomass powder gas flow inlet is directly connected to the external transportation system, reducing the risk of powder leakage and improving the safety and reliability of equipment operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure provided by an embodiment of the present invention; Figure 2 A cross-sectional structural schematic diagram provided for an embodiment of this utility model; Figure 3 This is a schematic diagram of one end of the structure provided for an embodiment of the present utility model.

[0018] In the diagram: 1-Biomass nozzle; 2-Swirl plate; 3-Burn cone; 4-Burn body; 5-Inlet of biomass powder gas flow. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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.

[0020] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a biomass swirl burner, including a burner body 4, a biomass nozzle 1 at one end of the burner body 4, and a biomass powder gas flow inlet 5 at the other end of the burner body 4. The biomass powder gas flow inlet 5 is connected to an external biomass powder transport system. A cone 3 is provided at one end of the burner body 4 near the biomass nozzle 1. A swirl plate 2 is provided between the cone 3 and the burner body 4. The swirl plate 2 is fixedly installed on the inner wall of the burner body 4. This biomass swirl burner arranges the burner body 4 as a whole in the central air duct of the swirl burner, without modifying the overall structure of the original swirl burner. Installation can be completed solely through its own modular design, which greatly reduces the difficulty and cost of equipment modification, while avoiding the structural damage risk caused by openings in the water-cooled wall.

[0021] The cone 3 and the burner body 4 are connected by two methods: "support rib + welding" or "support rib + bolts". Customers can choose according to their needs. The support rib connection can reduce the obstruction of airflow and ensure smooth airflow. The welding connection can improve the structural stability and is suitable for long-term stable operation. The bolt connection facilitates disassembly and maintenance in the later stage and is suitable for working conditions that require regular maintenance. The swirl plate 2 and the cone 3 are not directly connected. They achieve functional synergy only through the airflow process of "upstream swirl and downstream deflection". Together, they provide a guarantee for the "stable combustion" and "full mixing" of biomass powder and effectively avoid airflow turbulence caused by interference between components.

[0022] Please see Figure 2 and Figure 3 The swirl plate 2 is inclinedly set on the inner wall of the burner body 4, and the swirl plate 2 forms a horizontal angle with the center line of the burner, with the horizontal angle being 5-20°. This angle range can precisely adjust the swirl intensity of the biomass powder airflow, avoiding insufficient swirl and uneven mixing due to too small an angle, and preventing increased airflow resistance and energy consumption due to too large an angle. It can adapt to the combustion requirements of biomass powders with different calorific values ​​and improve combustion efficiency.

[0023] Multiple swirl plates 2 are provided, and the multiple swirl plates 2 are equally distributed and installed around the inner wall of the burner body 4. The equally distributed and surrounding arrangement can make the airflow form a uniform swirling field in the burner body 4, avoiding the deposition of biomass powder caused by local airflow velocity differences. At the same time, the synergistic effect of multiple swirl plates 2 can enhance the rotational stability of the airflow and further improve the mixing uniformity of biomass powder and air. 6-12 swirl plates can be set.

[0024] The cone 3 and the burner body 4 are concentrically arranged, and the cone 3 is conical. The concentric arrangement ensures that the cone 3 guides the airflow evenly and avoids the airflow deviating to one side and the temperature distribution at the nozzle due to eccentricity. The conical structure can smoothly guide the airflow to diffuse outward, reduce the turbulence generated by the airflow impact, reduce pressure loss, and at the same time facilitate processing and manufacturing, reducing production costs.

[0025] The tip of the cone 3 is arc-shaped, and the included angle formed by the two sides of the cone 3 is 5-15°. The arc-shaped tip can reduce the vortex of airflow at the head of the cone 3, reducing airflow resistance and energy loss. The included angle range of 5-15° can accurately control the size of the negative pressure recirculation zone. If the included angle is too large, the recirculation zone can be expanded and the stable combustion effect can be improved, making it suitable for difficult-to-burn biomass powder. If the included angle is too small, the recirculation zone can be reduced and excessive low-temperature flue gas recirculation can be avoided, which will affect the combustion temperature, making it suitable for easy-to-burn biomass powder.

[0026] The burner body 4 is isolated from the outside world, forming an independent space. This independent and enclosed space can prevent cold air from seeping in and affecting the combustion temperature, while avoiding resource waste and environmental pollution caused by biomass powder leakage. It can also protect internal components from external dust and moisture corrosion, extending the service life of the components.

[0027] The inlet 5 of the biomass powder airflow is a tubular channel; the tubular channel facilitates precise connection with the pipeline of the external biomass powder transportation system, reducing powder leakage caused by connection gaps; at the same time, the tubular structure can guide the airflow to enter the burner body 4 stably, avoid diffusion turbulence at the airflow inlet, ensure stable biomass powder delivery rate, and provide a stable raw material supply for subsequent swirl mixing and combustion.

[0028] Working principle: External biomass powder enters the burner body 4 through the tubular biomass powder airflow inlet 5 (the burner body 4 is an independent and enclosed space to prevent the powder from mixing with external impurities); the incoming biomass powder airflow first comes into contact with the swirl plate 2 fixed to the inner wall of the burner body 4. Because the swirl plate 2 is at a horizontal angle of 5-20° with the burner centerline and is evenly distributed around the inner wall, the airflow generates a rotational motion under the guidance of the swirl plate 2, and the rotation direction is consistent with the original airflow rotation direction of the swirl burner, thus initially achieving the mixing of biomass powder and air; The rotating airflow guided by the swirl plate 2 continues to move toward the biomass nozzle 1. Along the way, it passes the conical cone 3 (the tip of the cone 3 is arc-shaped with an included angle of 5-15°) set concentrically with the burner body 4. The cone 3 guides the airflow toward the outer side of the inner wall of the burner body 4, so that the airflow forms an outward diffusion trend in the area near the biomass nozzle 1. When the airflow finally exits from the biomass nozzle 1, a negative pressure recirculation zone is formed at the center of the nozzle due to the guiding effect of the cone 3. The high-temperature flue gas in the furnace is rolled back to the vicinity of the biomass nozzle 1 under the action of negative pressure, providing initial heat for the combustion of biomass powder and promoting rapid and complete combustion of biomass powder. The flue gas generated by combustion is further mixed with the airflow of the original swirl burner to complete the subsequent combustion process, while reducing the generation of nitrogen oxides and the risk of alkali metal corrosion.

[0029] It should be noted that the specific model and specifications in this solution need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0030] The power supply and its principle in this solution are clear to those skilled in the art, and will not be described in detail here.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A biomass cyclone burner, characterized in that, include The burner body has a biomass nozzle at one end and a biomass powder gas inlet at the other end, which is connected to an external biomass powder transport system. A swirl cone is located at one end of the burner body near the biomass nozzle, and a swirl plate is located between the swirl cone and the burner body. The swirl plate is fixedly installed on the inner wall of the burner body.

2. A biomass cyclone burner as described in claim 1, characterized in that: The swirl plate is inclinedly arranged on the inner wall of the burner body, and the swirl plate forms a horizontal angle with the center line of the burner, with the horizontal angle being 5-20°.

3. A biomass cyclone burner as described in claim 2, characterized in that: Multiple swirl plates are provided, and the multiple swirl plates are equally distributed and installed around the inner wall of the burner body.

4. A biomass cyclone burner as described in claim 1, characterized in that: The cone-shaped burner body is concentrically arranged with the burner body and is conical in shape.

5. A biomass cyclone burner as described in claim 4, characterized in that: The tip of the cone is arc-shaped, and the included angle formed by the two sides of the cone is 5-15°.

6. A biomass cyclone burner as described in claim 1, characterized in that: The burner body is isolated from the outside world, forming an independent space.

7. A biomass cyclone burner as described in claim 1, characterized in that: The inlet of the biomass powder gas flow is a tubular channel.

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