Mechanical spiral-flow type burner suitable for industrial kiln

Abstract

The mechanical spiral-flow type combustor suitable for the industrial kiln comprises a combustor base and an air shell, the air shell is installed at the side end of the combustor base, and outer ring combustor core assemblies and an inner ring combustor core assembly located between the outer ring combustor core assemblies are installed in the air shell; a head fire hole of the outer ring burner core assembly is arranged to be a spiral beveled hole, and axial and tangential double rotational flow is formed. A head fire hole of the inner ring burner core assembly is a straight fire hole, and a mechanical swirler is mounted on the outer side close to the head of the inner ring burner core assembly; a gas channel communicated with all combustible materials and comburent materials is arranged in the burner base, and an outer ring air inlet connector, an outer ring fuel gas inlet connector, an inner ring comburent gas inlet connector and an inner ring fuel gas inlet connector which are communicated with the interior of the air shell are arranged on the outer side of the burner base. Therefore, the combustion heat efficiency is improved while NOX is reduced, the structure is simple, the machining process difficulty is low, few materials are used, the manufacturing cost is low, and the maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of burners, in particular to a mechanical cyclone burner suitable for industrial kilns. BACKGROUND

[0002] In the field of industrial kilns, the performance of the burner plays a key role in production efficiency, energy consumption and pollutant emissions. The low-nitrogen gas burner disclosed in Chinese patent publication CN113864780B includes a center air pipe, an inner ring combustion-supporting cylinder body, an outer ring combustion-supporting cylinder body and a burner shell. It adopts technologies such as enhanced gas and combustion-supporting gas mixing, dense and thin combustion, and staged and segmented combustion to try to reduce the emission of pollutants such as NOx. However, this burner has obvious defects: (1) it is composed of 13 burner core components in the outer ring, middle ring and inner ring, which leads to dispersed flames, unfocused central flames, low thermal efficiency, and cannot fully utilize energy, increasing the cost of industrial production; (2) the burner fire hole is easy to block, and once blocked, it may cause backfire, thereby damaging the burner, affecting the continuity of production, and increasing equipment maintenance costs; (3) the complex structure makes the processing technology difficult, and a large amount of materials are needed in the production process, resulting in high manufacturing cost, which limits its wide application in industrial production.

[0003] Therefore, there is an urgent need for a new type of burner that can solve the problems of low thermal efficiency, easy blockage of fire hole and high cost while ensuring low nitrogen emission. SUMMARY

[0004] To solve the technical problems in the background art, the present application proposes a mechanical cyclone burner suitable for industrial kilns.

[0005] The mechanical cyclone burner suitable for industrial kilns proposed by the present application comprises a burner seat and an air shell, the air shell is installed at the side end of the burner seat, the outer ring burner core component and the inner ring burner core component located between the outer ring burner core component are installed inside the air shell, the head fire hole of the outer ring burner core component is provided as a spiral bevel hole, forming axial + tangential double cyclone; the head fire hole of the inner ring burner core component is provided as a straight fire hole, and a mechanical cyclone is installed near the outer side of the head thereof, the burner seat is internally provided with a gas path channel for mutual flow of each combustible and combustion-supporting material, and externally provided with an outer ring air inlet connector, an outer ring fuel gas inlet connector, an inner ring combustion-supporting material inlet connector and an inner ring fuel gas inlet connector which are in communication with the inside of the air shell.

[0006] In this way, the asymmetric structure of the spiral bevel hole of the head of the outer ring burner core component + the straight fire hole of the head of the inner ring burner core component can solve the contradiction between backfire and thermal efficiency; and the modular structure design reduces the manufacturing cost by more than 40%.

[0007] Preferably, the helical bevel hole has a width of 2.6-3.5mm and an angle of 22.5°-30° with the parallel line.

[0008] Thus, during combustion, high-speed airflow is ejected from the special-shaped fire hole, and due to the violent movement of the airflow, high-speed rotational flow is generated. The rotational flow has the characteristics of relatively long, which can make fuel and combustion-supporting material fully contact in a larger space and time, thereby improving the combustion thermal efficiency, making the fuel fully burn, and reducing energy waste.

[0009] Preferably, the diameter of the straight fire hole is 3.0-3.5mm.

[0010] Thus, the straight fire hole with a larger diameter has a simple structure and is not easily blocked by impurities, effectively reducing the probability of retempering and ensuring the stability and safety of the operation of the burner.

[0011] Preferably, the mechanical cyclone is a cyclone disc, and the cyclone disc is circumferentially spaced apart by 8-10 cyclone blades, each of which has an angle of 22.5°-30°, and the cyclone blades are designed with variable angles: the root angle of each cyclone blade gradually transitions from 30° to 22.5° at the top.

[0012] Thus, the combustion-supporting material is accelerated by the cyclone disc, and the gas molecule groups and air molecule groups collide and diffuse at high speed, and the combustion-supporting material and the gas are fully mixed, which will reduce the generation of emissions.

[0013] Preferably, the combustion-supporting material is oxygen-enriched or pure oxygen.

[0014] Thus, the participation of nitrogen in the air is reduced, thereby reducing the amount of fuel-type NO X .

[0015] Preferably, the flow rate of the outer ring burner core assembly accounts for 3 / 4 of the total flow rate of the burner, and the flow rate of the inner ring burner core assembly accounts for 1 / 4 of the total flow rate of the burner.

[0016] Thus, by reducing the fuel flow rate and replacing the combustion-supporting material, the central flame temperature is reduced and the nitrogen content is reduced, thereby reducing the amount of thermal NO X and fuel NO X .

[0017] Preferably, the burner seat and the air casing are connected by bolts, and a silica gel sealing gasket is provided therebetween.

[0018] Thus, the sealing of the connection is ensured, and gas leakage is prevented.

[0019] Preferably, the outer ring combustor core assembly and the inner ring combustor core assembly are sealingly connected with the combustor base through threads of themselves.

[0020] In this way, the layered installation structure is compact and convenient to disassemble and maintain.

[0021] In summary, the present application has the following beneficial effects: (1) the head fire hole of the outer ring combustor core assembly is provided as a helical chamfered hole to form axial + tangential double swirls, and during combustion, due to the violent movement of high-speed airflow, a high-speed swirl flame is generated, the ejected flame is relatively long, and the high-speed swirl flame and the mechanical swirler installed on the inner ring combustor core assembly accelerate the mixing of combustion-supporting material and gas, while ensuring the reduction of NO X emissions, the combustion efficiency is significantly improved; (2) the head fire hole of the inner ring combustor core assembly is a straight fire hole, which is not easy to block, and reduces the probability of backfire; (3) the structure is simple, unnecessary parts and complex connection methods are reduced, the processing difficulty is reduced, and the production process is more simple and efficient. At the same time, the optimized structure reduces the amount of material used, directly reducing the manufacturing cost. In addition, the simple structure is also convenient for equipment maintenance and repair, reduces the maintenance cost, improves the service life of the equipment, and is more conducive to the actual production and economic benefit improvement of the factory.

[0022] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of a mechanical swirl type combustor suitable for an industrial furnace according to an embodiment of the present application;

[0024] Figure 2 is a head structure schematic view of an outer ring combustor core assembly according to an embodiment of the present application;

[0025] Figure 3 is a head structure front view of an outer ring combustor core assembly according to an embodiment of the present application;

[0026] Figure 4 is a head structure sectional view of an outer ring combustor core assembly according to an embodiment of the present application;

[0027] Figure 5 is a head structure schematic view of an inner ring combustor core assembly according to an embodiment of the present application;

[0028] Figure 6 is a structure schematic view of a swirl disc of an inner ring combustor core assembly according to an embodiment of the present application.

[0029] In the drawings:

[0030] 1. Burner seat; 11. Outer ring air inlet connector; 12. Outer ring gas inlet connector; 13. Inner ring combustion-supporting material inlet connector; 14. Inner ring gas inlet connector; 2. Air casing; 3. Outer ring burner core assembly; 31. Spiral bevel hole; 4. Inner ring burner core assembly; 41. Straight fire hole; 42. Swirl disk; 421. Swirl blade. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0032] like Figures 1-6 As shown, the present embodiment proposes a mechanical swirl burner suitable for industrial kilns, comprising a burner seat 1 and an air shell 2. The air shell 2 is mounted on the side end of the burner seat 1. An outer ring burner core assembly 3 and an inner ring burner core assembly 4 located between the outer ring burner core assembly 3 are mounted inside the air shell 2. The head fire hole of the outer ring burner core assembly 3 is set as a spiral bevel hole 31 to form an axial + tangential double swirl; the head fire hole of the inner ring burner core assembly 4 is set as a straight fire hole 41, and a mechanical swirler is mounted near the outside of its head. The burner seat 1 is provided with an air path channel for mutual circulation with various combustibles and combustion-supporting materials inside, and is provided with an outer ring air inlet joint 11, an outer ring gas inlet joint 12, an inner ring combustion-supporting material inlet joint 13 and an inner ring gas inlet joint 14 on the outside that are connected to the interior of the air shell 2.

[0033] Two outer ring burner core assemblies 3 are provided. The burner base 1 and air housing 2 are bolted together, with a silicone gasket installed between them to ensure a tight connection and prevent gas leakage. The outer ring burner core assemblies 3 are sealed to the burner base 1 via their own threads. An inner ring burner core assembly 4 is further installed between the outer ring burner core assemblies 3, and the inner ring burner core assembly 4 is also sealed to the burner base 1 via its own threads. This layered installation structure is compact and easy to disassemble and maintain.

[0034] Specifically, if Figures 2-4 As shown, the spiral beveled holes 31 have a width of 2.6 to 3.5 mm and an angle of 22.5 to 30 degrees with respect to parallel lines. During combustion, high-speed airflow is ejected from this specially shaped fire hole. Due to the violent movement of the airflow, a high-speed swirling flame is generated. This swirling flame is relatively long, allowing the fuel and the combustion-supporting material to fully contact over a larger space and time, thereby improving combustion thermal efficiency, ensuring more complete combustion of the fuel, and reducing energy waste.

[0035] In this way, the fire hole at the head of the outer ring burner core assembly 3 is set as a spiral bevel hole 31 to form an axial + tangential double swirl. During combustion, due to the violent movement of the high-speed airflow, a high-speed swirl flame is generated. The ejected flame is relatively long. The generated high-speed swirl flame and the mechanical swirler installed on the inner ring burner core assembly 4 accelerate the mixing of the combustion-supporting material and the gas, ensuring the reduction of NO X While discharging, the combustion thermal efficiency is significantly improved; the head fire hole of the inner ring burner core assembly 4 is a straight fire hole 41, which is not easy to clog and reduces the probability of backfire. The burner structure in this embodiment is simple, eliminating unnecessary components and complex connection methods, reducing the difficulty of the processing technology, and making the production process simpler and more efficient. At the same time, the optimized structure reduces the amount of material used, directly reducing manufacturing costs. In addition, the simple structure also facilitates equipment maintenance and overhaul, reduces maintenance costs, and increases the service life of the equipment, which is more conducive to the actual production and economic benefits of the factory.

[0036] Furthermore, if Figure 5 As shown, the diameter of the straight fire hole 41 is set to 3.0-3.5 mm. The larger diameter straight fire hole 41 has a simple structure and is less likely to be clogged by impurities, effectively reducing the probability of flashback and ensuring the stability and safety of the burner operation. This solves the problem of flashback damage caused by easy fire hole clogging.

[0037] In this embodiment, Figure 6 As shown, the mechanical cyclone is configured as a swirl disk 42, and the swirl disk 42 is provided with 8-10 swirl blades 421 at circumferential intervals. The angle of each swirl blade 421 is set to 22.5° to 30°, and the swirl blades 421 adopt a variable angle design: the root angle of each swirl blade 421 is 30° and gradually transitions to 22.5° at the top. When the combustible material passes through the swirl disk 42, it will be accelerated and form a swirl, so that the gas molecules and air molecules can collide and diffuse at high speed, thereby achieving full mixing of the combustible material and the gas. This full mixing can promote the combustion reaction, reduce the generation of emissions during the combustion process, and especially reduce NO X The production of.

[0038] Preferably, the combustion-supporting material is oxygen-enriched or pure oxygen. This reduces the participation of nitrogen in the air, thereby reducing fuel-type NO X The amount of generation.

[0039] At the same time, the flow rate of the outer ring burner core assembly 3 is set to 3 / 4 of the total burner flow rate, and the flow rate of the inner ring burner core assembly 4 is set to 1 / 4 of the total burner flow rate. By reducing the fuel flow rate ratio and replacing the combustion aid, the center flame temperature and nitrogen content are reduced, thereby reducing the thermal NO X and fuel-type NO X The amount of generation.

[0040] It should be noted that the gas enters the tee branch pipe through the main pipe, and then flows into the gas flow regulating valve. The operator can set the flow value on the PID of each branch gas flow regulating valve to accurately control the gas flow of the outer ring combustor core assembly 3 and the inner ring combustor core assembly 4, so that the gas enters the inside of the respective combustor passage and burns after being fully mixed with the combustion-supporting material. In addition, the burner flow size of the embodiment can be adjusted manually or remotely, which is convenient for the operator to adjust flexibly according to different production needs and working conditions.

[0041] In summary, the outer ring: air / gas mixing → spiral flame (temperature zone 1200℃); the inner ring: oxygen-rich (30% O2) / gas → cyclone enhanced combustion (temperature zone 1600℃). The asymmetric structure of the spiral chamfered hole 31 of the head of the outer ring combustor core assembly 3 + the straight fire hole 41" of the head of the inner ring combustor core assembly 4 can solve the contradiction between backfire and thermal efficiency. Through the synergistic effect of the spiral chamfered fire hole of the head of the outer ring combustor core assembly 3 and the cyclone of the inner ring combustor core assembly 4, combined with a 75:25 staged combustion ratio, a thermal efficiency of more than 89% and NOx<80mg / m 3 are realized; the modular structure design reduces the manufacturing cost by more than 40%.

[0042] The combustor of the embodiment can reduce NO X at the same time, the combustion thermal efficiency is improved based on the original technical solution, truly realizing the double balance of energy saving and emission reduction, which is more suitable for the sustainable development policy of green and energy-saving factories advocated by the country, and solves the problem of low thermal efficiency of industrial burners. The structure design is reasonable, has the advantages of low processing difficulty, less material, low manufacturing cost, low maintenance cost, and is more beneficial to actual production of factories.

[0043] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" should be construed as broadest possible terms, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A mechanical swirl burner suitable for industrial kilns, comprising a burner seat and an air shell, wherein the air shell is mounted on the side end of the burner seat, characterized in that: An outer ring burner core assembly and an inner ring burner core assembly located between the outer ring burner core assemblies are installed inside the air shell. The head fire hole of the outer ring burner core assembly is set as a spiral bevel hole to form an axial + tangential double swirl; the head fire hole of the inner ring burner core assembly is set as a straight fire hole, and a mechanical swirler is installed on the outside near its head. The burner seat is provided with an air path channel for mutual circulation with various combustibles and combustion-supporting materials, and is provided with an outer ring air inlet joint, an outer ring gas inlet joint, an inner ring combustion-supporting material inlet joint and an inner ring gas inlet joint on the outside that are connected to the interior of the air shell.

2. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The width of the spiral beveled hole is 2.6 to 3.5 mm, and the angle between the spiral beveled hole and the parallel line is 22.5° to 30°.

3. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The diameter of the straight fire hole is set to 3.0-3.5 mm.

4. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The mechanical cyclone is configured as a swirl disk, and the swirl disk is provided with 8-10 swirl blades at circumferential intervals. The included angle of each swirl blade is set to 22.5° to 30°, and the swirl blades adopt a variable angle design: the root angle of each swirl blade is 30° and gradually transitions to 22.5° at the top.

5. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The combustion-supporting material is set to be oxygen-enriched or pure oxygen.

6. The mechanical swirl burner suitable for industrial furnaces according to claim 5, characterized in that: It is set that the flow rate of the outer ring burner core assembly accounts for 3 / 4 of the total flow rate of the burner, and the flow rate of the inner ring burner core assembly accounts for 1 / 4 of the total flow rate of the burner.

7. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The burner seat and the air housing are connected by bolts, and a silicone sealing gasket is provided between them.

8. The mechanical swirl burner suitable for industrial furnaces according to claim 1, characterized in that: The outer ring burner core assembly and the inner ring burner core assembly are both sealed and connected to the burner seat through their own threads.

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