Air-fuel dual-stage swirl burner

Abstract

The application discloses a kind of air-fuel double-staged swirl burner, belong to swirl burner technical field.The burner includes gas passage, air passage, ignition device on central axis, and sequentially arranged from inside to outside along radial direction center gas swirl vane, inner layer air swirl vane, outer layer gas swirl vane and outer layer air swirl vane, form the cross-staged arrangement structure of gas and air.Gas and air are divided into two and enter hearth in swirl mode, wherein inner layer air amount and inner layer gas equivalence ratio is close to 1, make central region be in fuel-rich state, under low-oxygen environment effectively inhibit the generation of nitrogen oxide.Outer layer air ensures that fuel is fully combusted, improve combustion efficiency.The application has the advantages of low pollutant emission, complete combustion, simple structure and easy to disassemble and overhaul, effectively solve the technical problem of low-nitrogen combustion of gas fuel.

Description

Technical Field

[0001] This application belongs to the field of swirl burner technology, and particularly relates to an air-fuel dual-stage swirl burner. Background Technology

[0002] With increasingly stringent environmental protection requirements, the original NOx emissions from boilers are becoming more stringent. x Emissions restrictions are becoming increasingly stringent. Currently, conventional swirl burners typically use a single inlet to feed air or fuel gas into the furnace, or only perform simple partial premixed combustion. This design has the following technical drawbacks: poor mixing of fuel gas and air, low combustion efficiency, and low NOx emissions. x Emissions are high.

[0003] Therefore, how to improve the burner's layout to achieve deep mixing of air and fuel gas, thereby avoiding high-temperature concentration and suppressing NO2, is crucial. x Generation has become a pressing technical problem to be solved in the field of swirl burners. Summary of the Invention

[0004] The purpose of this application is to provide an air-fuel dual-stage swirl burner that improves combustion efficiency and reduces NO by arranging air and fuel in two stages. x emission.

[0005] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows: This application provides an air-fuel dual-stage swirl burner, comprising: a gas passage for inputting gaseous fuel; an air passage for inputting air; an ignition device disposed on the central axis of the burner; and radially arranged from the inside to the outside: a central gas swirl blade, an inner air swirl blade, an outer gas swirl blade, and an outer air swirl blade.

[0006] Optionally, the gas entering through the gas channel is divided into two streams, of which 25% of the gas enters the furnace through the central gas swirl blades, and the remaining 75% of the gas enters the furnace through the outer gas swirl blades.

[0007] Optionally, the air entering through the air channel is divided into two streams. The first stream of air enters the furnace through the inner air swirl blades, and the amount of this air is close to the chemical equivalence ratio of the inner fuel gas to 1. The remaining second stream of air enters the furnace through the outer air swirl blades.

[0008] Optionally, the air entering through the inner air swirl blades and part of the gas passing through the central gas swirl blades and the outer gas swirl blades are mixed and then burned; the remaining air required for combustion enters the furnace through the outer air swirl blades to ensure complete combustion of the fuel.

[0009] Optionally, the inner air swirl blades are arranged between the central gas swirl blades and the outer gas swirl blades to form a cross-stage arrangement structure of gas and air.

[0010] Optionally, after passing through the corresponding swirl blades, the gas and air enter the furnace in a swirling manner for mixing and combustion.

[0011] Optionally, the central region of the burner is in a fuel-rich state during combustion, suppressing NO through a low-oxygen environment. x The generation of .

[0012] Optionally, the air-fuel dual-stage swirl burner also includes: a flame detection system, a flame-viewing tube, and auxiliary accessories.

[0013] Compared with the prior art, the beneficial effects of the embodiments of this application are: 1. Significantly inhibits NO x To achieve clean combustion, an inner air swirl vane is positioned between the central and outer gas swirl vanes, creating a cross-stage arrangement of gas and air. This structure allows the inner air to mix with both gas streams for fuel-rich combustion, creating an oxygen-deficient environment in the combustion center where nitrogen atoms are difficult to oxidize, thus effectively suppressing NO₂ production. x The generation of NO is also affected by the thorough mixing of the inner air and fuel gas, which allows the high-temperature zone to move towards the flame root, resulting in a more uniform temperature distribution. This further suppresses NO production by reducing the temperature of localized high-temperature areas. x The generation of.

[0014] 2. High mixing efficiency and more complete combustion: Air and fuel gas are fed into the furnace through four channels, and each enters in a swirling manner through its corresponding swirl blades, which greatly enhances the mixing effect of air and fuel gas, ensuring that fuel and air can fully contact each other at different stages. The remaining air provided by the outermost air channel ensures that the unburned fuel is further fully burned, improving the overall combustion efficiency.

[0015] 3. Reasonable structure and easy maintenance: This burner is suitable for low-NOx combustion of gaseous fuels, and has a simple structure that is easy to inspect and replace. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1A schematic diagram of the arrangement structure of an air-fuel dual-stage swirl burner provided in an embodiment of this application is shown.

[0018] Figure 2 It shows Figure 1 AA view in the middle.

[0019] Illustration: 1. Gas passage; 2. Air passage; 3. Central gas swirl vane; 4. Inner air swirl vane; 5. Outer gas swirl vane; 6. Ignition device; 7. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] Furthermore, 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, "multiple" means two or more, unless otherwise explicitly specified.

[0023] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0024] Please see Figure 1 and Figure 2 As shown in the embodiment of this application, a dual-stage air-fuel swirl burner is provided. To improve the mixing efficiency of fuel gas and air, the fuel gas and air are further staged. The fuel gas and air are fed into the furnace through two separate channels, which are arranged in a cross pattern. The amount of air in the inner layer is lower than the theoretical amount of air for the fuel, ensuring thorough mixing of the inner layer air and fuel gas while maintaining fuel-rich combustion. This avoids the concentration of high-temperature areas and reduces NO. x The exhaust is completed, and the remaining air is supplied by the outermost channel to ensure complete combustion of the fuel.

[0025] Specifically, the air-fuel dual-stage swirl burner includes: a gas passage 1 for inputting gaseous fuel; an air passage 2 for inputting air; and an ignition device 7, which is located on the central axis of the burner.

[0026] The core of this burner lies in the radial arrangement from the inside out: the central gas swirl blade 3, the inner air swirl blade 4, the outer gas swirl blade 5, and the outer air swirl blade 6, forming a cross-stage structure of "central gas - inner air - outer gas - outer air". This layered and spaced arrangement allows for better mixing of air and gas, resulting in more complete combustion.

[0027] The aforementioned air-fuel dual-stage swirl burner is used for low-NOx combustion of gaseous fuels and features low pollutant emissions, simple structure, and easy disassembly and maintenance.

[0028] In some embodiments, the gas enters the burner through the gas passage 1 and is divided into two streams. Approximately 25% of the gas enters the furnace through the central gas swirl vane 3, while the remaining 75% enters the furnace through the outer gas swirl vane 5. This proportional distribution of gas, combined with the corresponding swirl vanes, allows the gas to enter the furnace in a swirling manner, significantly enhancing the initial mixing effect between the gas and air.

[0029] In some embodiments, the air enters the burner through the air passage 2 and is divided into two streams. The first stream of air passes through the inner air swirl vanes 4 and enters the furnace, and the amount of this air is designed to have a chemical equivalence ratio close to 1 with the inner fuel gas. The remaining second stream of air enters the furnace through the outer air swirl vanes 6.

[0030] This design ensures thorough mixing of the inner layer air with the fuel gas, guaranteeing fuel-rich combustion and preventing the concentration of high-temperature areas, thus reducing NO₂ levels. x Emissions.

[0031] In some embodiments, during actual combustion, the air entering through the inner air swirl vane 4 mixes with a portion of the fuel gas passing through the central fuel gas swirl vane 3 and the outer fuel gas swirl vane 5 before combustion. The remaining air required for combustion is supplied by the outermost outer air swirl vane 6 and enters the furnace. This subsequent replenishment of air ensures that the incompletely burned fuel can be further fully combusted, ensuring overall combustion efficiency.

[0032] In some embodiments, this application constructs a cross-stage arrangement structure of gas and air in space by arranging the inner air swirl blade 4 between the central gas swirl blade 3 and the outer gas swirl blade 5.

[0033] This cross-hierarchical structure shifts the high-temperature region towards the flame root, resulting in a more uniform temperature distribution. By reducing the temperature of localized high-temperature areas, it further structurally suppresses NO.x The generation of.

[0034] In some embodiments, after the gas and air enter the burner, they pass through their respective swirl vanes.

[0035] All fluids enter the furnace in a swirling manner for mixing and combustion. This enhanced swirling organization ensures that the fuel and air can make full contact, improving overall combustion stability.

[0036] In some embodiments, the precise stage ratio and structural arrangement described above ensure that the central region of the burner is in a fuel-rich state during combustion. In this low-oxygen / oxygen-deficient environment, nitrogen atoms are difficult to oxidize, thereby effectively suppressing NO production. x The generation of [something] achieves clean combustion.

[0037] In some embodiments, to ensure the safe and stable operation of the burner, the system is also equipped with a flame detection system, a flame-viewing tube, and other auxiliary accessories. These components, together with the combustion components disclosed above, constitute a complete air-fuel dual-stage swirl burner system. It should be noted that these components are prior art and will not be described in detail in this embodiment.

[0038] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application, and should all be included within the protection scope of this application.

Claims

1. A dual-stage air-fuel swirl burner, characterized in that, include: Gas passage for introducing gaseous fuel; Air passage, used for air intake; The ignition device is located on the central axis of the burner; And arranged radially from the inside out: central gas swirl blade, inner air swirl blade, outer gas swirl blade and outer air swirl blade.

2. The air-fuel dual-stage swirl burner according to claim 1, characterized in that: The gas entering through the gas channel is divided into two streams, with 25% of the gas entering the furnace through the central gas swirl blades and the remaining 75% of the gas entering the furnace through the outer gas swirl blades.

3. The air-fuel dual-stage swirl burner according to claim 2, characterized in that: The air entering through the air passage is divided into two streams. The first stream of air enters the furnace through the inner air swirl blades, and the amount of this air is close to the chemical equivalence ratio of the inner fuel gas to 1. The remaining second stream of air enters the furnace through the outer air swirl blades.

4. The air-fuel dual-stage swirl burner according to claim 3, characterized in that: The air entering through the inner air swirl blades and the partial combustion gas passing through the central gas swirl blades and the outer gas swirl blades are mixed and then burned; the remaining air required for combustion enters the furnace through the outer air swirl blades to ensure complete combustion of the fuel.

5. A dual-stage air-fuel swirl burner according to claim 1, characterized in that: The inner air swirl blades are arranged between the central gas swirl blades and the outer gas swirl blades, forming a cross-stage arrangement structure of gas and air.

6. A dual-stage air-fuel swirl burner according to claim 5, characterized in that: After passing through their respective swirl blades, the fuel gas and air enter the furnace in a swirling manner for mixing and combustion.

7. A dual-stage air-fuel swirl burner according to claim 1, characterized in that: The central region of the burner is in a fuel-rich state during combustion, suppressing NO through a low-oxygen environment. x The generation of .

8. A dual-stage air-fuel swirl burner according to claim 1, characterized in that, Also includes: Fire detection system, fire detector, and auxiliary accessories.

Images