Adjustable burner of annealing furnace

Abstract

The utility model discloses an adjustable burner of an annealing furnace, which comprises a gas cylinder and a combustion-supporting cylinder, the combustion-supporting cylinder is fixedly sleeved on the outer side of the gas cylinder, a packed column is fixed on the inner wall of one end of the combustion-supporting cylinder, and gas and combustion-supporting gas are mixed among the tail ends of the gas cylinder, the combustion-supporting cylinder and the packed column through a diffusion component, the diffusion assembly comprises an internal diffusion cover fixed to the tail end of the packed column, an external diffusion cover fixed to the tail end of the fuel gas cylinder and a protective cover fixed to the tail end of the combustion-supporting cylinder, and part of combustion-supporting gas enters the fuel gas channel from an external flow guide hole to be mixed with fuel gas to form mixed gas; the other part of combustion-supporting gas is guided by the air gathering ring and then discharged into the combustion area, part of mixed gas formed by mixing enters the combustion area through the internal flow guide holes, the other part of mixed gas is directly discharged into the combustion area to be mixed with the combustion-supporting gas, and the combustion-supporting gas and the fuel gas are alternately mixed in the combustion area. And the mixing degree of the combustion-supporting gas and the fuel gas is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to annealing furnace burner technical field especially is involved in a kind of adjustable burner of annealing furnace. BACKGROUND

[0002] Annealing furnace burner is the key component for burning fuel to provide required heat in industrial annealing furnace, it realizes energy saving and environmental protection by high-efficiency combustion technology, regenerative burner as an advanced technology, by preheating air and coal gas to high temperature and reducing the oxygen content of combustion zone, improve the waste heat recovery rate of flue gas, reduce the emission of nitrogen oxides and carbon dioxide, while saving fuel, by this technology, 60% energy saving rate and low NOx emission can be realized, the preheating temperature of combustion air can be as high as 800 DEG C or more, greatly improve the combustion efficiency, in order to improve the combustion efficiency, on the other hand, it can also improve the mixing condition by changing the angle of natural gas and air flow in burner, changing airflow speed, reducing airflow diameter and other ways, so as to improve the mixing speed and combustion efficiency;

[0003] Chinese patent publication No. CN207035120U discloses a kind of adjustable burner of annealing furnace, it includes hollow air casing, burner brick, burner core and ignition burner, one end of air casing is connected together with burner brick, air inlet is provided at the top of air casing, burner core includes gas pipe and air-fuel mixing head, gas inlet is arranged at both ends of gas pipe, burner brick is provided with primary air passage, secondary air passage and combustion chamber, wherein both ends of primary air passage and secondary air passage are communicated with air casing and combustion chamber respectively, primary air passage is arranged at the center of burner brick, secondary air passage is evenly distributed along the outside of primary air passage, the end of secondary air passage along combustion chamber is provided with necking, air-fuel mixing head extends into primary air passage through gas pipe, by using air staging technology, the flame combustion temperature is effectively reduced, the generation of thermal NOx is greatly reduced, so that the emission of NOx can be effectively reduced;

[0004] The above-mentioned technology realizes efficient and sufficient combustion of fuel gas by air staging technology, but since the combustion air is supplemented from outside the combustion area, it is difficult to ensure the sufficiency of combustion in the central region of fuel gas, which affects the efficiency and effect of combustion to some extent. Therefore, the utility model provides an adjustable burner of annealing furnace to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an adjustable burner of annealing furnace to solve the problem that the combustion air of the above-mentioned annealing furnace burner is supplemented from outside the combustion area, which makes it difficult to ensure the sufficiency of combustion in the central region of fuel gas.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme for solving the above technical problem: A kind of adjustable burner of annealing furnace, including gas cylinder and combustion cylinder, the outer side of gas cylinder is fixed with combustion cylinder, one end inner wall of combustion cylinder is fixed with filling column, gas and combustion gas are mixed by flow assembly between gas cylinder, combustion cylinder and filling column end.

[0007] Wherein, the flow assembly includes the internal diffusion cover fixed at the end of filling column, the external diffusion cover fixed at the end of gas cylinder and the protective cover fixed at the end of combustion cylinder, gas passage is formed between the internal diffusion cover and the external diffusion cover, combustion passage is formed between the external diffusion cover and the protective cover, and the external diffusion cover is densely covered with external flow guide hole, the internal diffusion cover is densely covered with internal flow guide hole, so that combustion gas from the external flow guide hole mixes with gas in gas passage and is guided out through internal flow guide hole.

[0008] As a further scheme of the utility model, the protective cover end is fixed with wind gathering ring gradually narrowing along gas flow direction.

[0009] As a further scheme of the utility model, the width of gas passage and combustion passage is gradually narrowed along gas flow direction.

[0010] As a further scheme of the utility model, the external flow guide hole and internal flow guide hole are distributed in staggered positions.

[0011] As a further scheme of the utility model, combustion pipe and gas pipe are fixedly embedded in the side wall of combustion cylinder, the end of gas pipe is communicated with gas cylinder, wherein, the gas flow injection direction of gas pipe is tangent to the inner wall of gas cylinder, and the gas flow injection direction of combustion pipe is tangent to the inner wall of combustion cylinder.

[0012] As a further scheme of the utility model, porous gas flow uniform plate is fixedly connected between gas cylinder and filling column, and the porous gas flow uniform plate is located between gas passage and gas pipe.

[0013] As a further scheme of the utility model, porous gas flow uniform plate is fixedly connected between gas cylinder and combustion cylinder, and the porous gas flow uniform plate is located between combustion passage and combustion pipe.

[0014] Compared with prior art, the utility model has the beneficial effects that:

[0015] 1. This utility model discloses an adjustable burner for an annealing furnace. Part of the combustion-supporting gas enters the gas passage through the external guide hole and mixes with the gas to form a mixed gas. Another part of the combustion-supporting gas is discharged into the combustion zone after being guided by the air-gathering ring. The mixed gas formed by the mixture enters the combustion zone through the internal guide hole, while the other part of the mixed gas is directly discharged into the combustion zone to mix with the combustion-supporting gas. The combustion-supporting gas and the gas can be interwoven and mixed in the combustion zone, resulting in a high degree of mixing between the combustion-supporting gas and the gas and more efficient gas combustion.

[0016] 2. The adjustable burner of this utility model annealing furnace allows the gas and air to enter the gas cylinder and combustion chamber respectively. They first flow spirally along the annular hollow gap until they pass through the flow equalization plate, where they can be evenly dispersed. This ensures that the gas and combustion-supporting gas are supplied evenly. At the same time, it helps to reduce wind resistance and prolong the residence time of the gas, combustion-supporting gas, and mixed gas in the combustion zone, which helps to achieve complete combustion of the gas.

[0017] 3. The adjustable burner of this utility model annealing furnace can adjust and control the flow rate ratio of the combustion-supporting gas and the gas, thereby changing the conditions under which the combustion-supporting gas enters the gas channel from the external guide hole and mixes with the gas. This alters the mixing effect between the gas and the combustion-supporting gas. Experiments have shown that good combustion efficiency can be maintained when the pressure of the combustion-supporting gas is slightly higher than that of the gas. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a three-dimensional structural diagram of an adjustable burner for an annealing furnace according to the present invention.

[0020] Figure 2 This is a side sectional view of an adjustable burner for an annealing furnace according to the present invention.

[0021] Figure 3 This utility model relates to an adjustable burner for an annealing furnace. Figure 2 Enlarged view of the structure at point A in the image;

[0022] Figure 4 This is a front view of an adjustable burner for an annealing furnace according to the present invention.

[0023] Figure 5 This utility model relates to an adjustable burner for an annealing furnace. Figure 2 Cross-sectional view of the structure along the BB direction;

[0024] Figure 6 This utility model relates to an adjustable burner for an annealing furnace. Figure 2 A cross-sectional view of the structure along the CC direction.

[0025] The components represented by the numbers in the drawings are listed as follows: 1, gas cylinder; 2, combustion-supporting cylinder; 21, combustion-supporting pipe; 22, gas pipe; 3, filling column; 4, flow-diffusing assembly; 41, inner diffusion cover; 411, inner flow-guiding hole; 42, outer diffusion cover; 421, outer flow-guiding hole; 43, protective cover; 431, wind-converging ring; 44, gas passage; 45, combustion-supporting passage; 5, porous gas flow-distributing plate; 6, porous gas flow-distributing plate. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with examples.

[0027] Please refer to Figures 1-6 The utility model provides a kind of adjustable burner of annealing furnace, including gas cylinder 1 and combustion-supporting cylinder 2, the outer side of gas cylinder 1 is fixedly equipped with combustion-supporting cylinder 2, combustion-supporting pipe 21 and gas pipe 22 are fixedly embedded in the side wall of combustion-supporting cylinder 2, the end of gas pipe 22 is communicated with gas cylinder 1, wherein, the airflow ejection direction of gas pipe 22 is tangent to the inner wall of gas cylinder 1, and the airflow ejection direction of combustion-supporting pipe 21 is tangent to the inner wall of combustion-supporting cylinder 2;

[0028] Specifically, gas enters gas cylinder 1 in tangent direction, which can promote the formation of rotating airflow in gas cylinder 1, help to reduce turbulence and energy loss in gas flow, make more energy available for combustion process, help to form stable flame, reduce local high-temperature area, thereby reduce the generation of nitrogen oxides, also help to extend the stay time of combustion-supporting gas, gas and mixed gas in combustion area, help to achieve full combustion of gas.

[0029] Further, the porous gas flow-distributing plate 5 is fixedly connected between the gas cylinder 1 and the filling column 3, and is located between the gas passage 44 and the gas pipe 22.

[0030] Specifically, the porous gas flow-distributing plate 5 is located between the gas passage 44 and the gas pipe 22, and a plurality of small holes densely arranged on the plate can make gas evenly dispersed into a plurality of small gas flows according to the principle of pressure balance and flow division in fluid mechanics. Due to the existence of small holes, gas will be divided into a plurality of small gas flows under the action of pressure when passing through the flow-distributing plate, and these small gas flows can enter the flow-diffusing assembly 4 in a more uniform state, laying a foundation for the subsequent efficient mixing of gas and combustion-supporting gas.

[0031] Further, the porous gas flow-distributing plate 6 is fixedly connected between the gas cylinder 1 and the combustion-supporting cylinder 2, and is located between the combustion-supporting passage 45 and the combustion-supporting pipe 21.

[0032] Specifically, the porous gas flow uniform plate 6 is densely covered with a plurality of small holes, which can disperse the combustion-supporting gas into a plurality of small gas flows, and the small gas flows can enter the flow dispersion assembly 4 more uniformly after passing through the flow uniform plate.

[0033] Further, the combustion-supporting cylinder 2 is fixed with a filling column 3 on the inner wall of one end thereof;

[0034] Specifically, the filling column 3 serves to support the inner diffusion cover 41, so that an annular gap is formed between the inner diffusion cover 41 and the outer diffusion cover 42.

[0035] Further, the gas cylinder 1, the combustion-supporting cylinder 2 and the filling column 3 are connected through the flow dispersion assembly 4 at the ends thereof to mix the gas and the combustion-supporting gas;

[0036] Specifically, the gas cylinder 1, the combustion-supporting cylinder 2 and the filling column 3 and the constituent components inside the flow dispersion assembly 4 are all made of high-temperature-resistant metal materials, which can be any one of nickel-based alloy, chromium alloy or molybdenum alloy.

[0037] Further, the flow dispersion assembly 4 includes the inner diffusion cover 41 fixed at the end of the filling column 3, the outer diffusion cover 42 fixed at the end of the gas cylinder 1 and the protective cover 43 fixed at the end of the combustion-supporting cylinder 2;

[0038] Specifically, the inner diffusion cover 41, the outer diffusion cover 42 and the protective cover 43 are all gradually widened along the gas flow direction, and the inner diffusion cover 41, the outer diffusion cover 42 and the protective cover 43 have different gradual change amplitudes, which is conducive to the diffusion of the gas, can increase the volume of the combustion area, and can cause the widths of the gas passage 44 and the combustion-supporting passage 45 to be gradually narrowed along the gas flow direction.

[0039] Further, the protective cover 43 is fixed with a wind gathering ring 431 which is gradually narrowed along the gas flow direction at the end thereof;

[0040] Specifically, the design of the wind gathering ring 431 helps to concentrate and guide the flow of the combustion-supporting gas, so that the gas flow is more concentrated, the combustion efficiency is improved, and the shape and length of the flame can be controlled, which is very important for specific industrial applications and combustion processes.

[0041] Further, the inner diffusion cover 41 and the outer diffusion cover 42 form a gas passage 44 therebetween, and the outer diffusion cover 42 and the protective cover 43 form a combustion-supporting passage 45 therebetween, and the widths of the gas passage 44 and the combustion-supporting passage 45 are gradually narrowed along the gas flow direction;

[0042] Specifically, as the channel width gradually narrows along the flow direction, the gas flow rate will increase, which can take advantage of the principle of fluid dynamics, that is, the flow rate will increase when the fluid passes through a narrow area, thereby increasing the kinetic energy of the gas, which can compensate for the gas pressure loss to a certain extent. The gas overflow from the flow hole, guarantee the strength of the gas discharged from the gas channel 44 and the combustion supporting channel 45, and in the process of narrowing the channel, the gas flow becomes more turbulent, which helps to increase the mixing between gas molecules and improve the combustion efficiency.

[0043] Further, the outer diffusion cover 42 is densely covered with external flow holes 421, and the inner diffusion cover 41 is densely covered with internal flow holes 411, so that the combustion supporting gas passing through the external flow holes 421 is mixed with the gas in the gas channel 44 and then guided out through the internal flow holes 411. The external flow holes 421 and the internal flow holes 411 are distributed in a staggered manner.

[0044] Specifically, the staggered distribution of the flow holes can make the combustion supporting gas and the gas form more effective mixing before entering the combustion area. This structure can promote turbulence and turbulence between the gases, thereby increasing the uniformity of the mixed gas. It is worth noting that the flow holes can be circular, strip-shaped or arc-shaped structures.

[0045] Working principle: when in use, gas enters the gas cylinder 1 from the gas pipe 22. Firstly, the gas flows in a spiral way along the annular gap between the gas pipe 22 and the filling column 3, during which the flow rate and pressure distribution of the gas are gradually adjusted, and a relatively stable gas flow state is preliminarily formed. Then, the gas passes through the porous gas flow uniformizing plate 5, and due to the dense small holes on the uniformizing plate, the gas is dispersed into numerous small and uniform gas flow beams, which enter the gas passage 44 in a more uniform state, preparing for subsequent mixing with combustion-supporting gas, while the combustion-supporting gas enters the combustion-supporting cylinder 2 from the combustion-supporting pipe 21. The combustion-supporting gas flows spirally along the gap between the gas cylinder 1 and the combustion-supporting cylinder 2, and during this process, its flow characteristics are similar to those of the gas, and preliminary energy adjustment and distribution optimization are also being carried out. Subsequently, the combustion-supporting gas passes through the porous gas flow uniformizing plate 6 and enters the combustion-supporting passage 45 uniformly after being dispersed by the uniformizing plate. At this time, part of the combustion-supporting gas in the combustion-supporting passage 45 enters the gas passage 44 through the dense external guide holes 421 on the external diffusion cover 42, mixes with the gas, and forms mixed gas. This part of mixed gas, due to the staggered distribution of the external guide holes 421 and the internal guide holes 411 on the internal diffusion cover 41, experiences multiple turning and mixing during the flow process, further improving the mixing uniformity. Another part of the combustion-supporting gas continues to flow in the combustion-supporting passage 45 and is guided by the wind gathering ring 431 at the end of the combustion-supporting cylinder 2. The gradually narrowing structure of the wind gathering ring 431 along the gas flow direction makes the combustion-supporting gas flow faster and the gas flow concentrate, and then it is discharged into the combustion area. The mixed gas in the gas passage 44, on the other hand, enters the combustion area through the internal guide holes 411, and the other part directly discharges into the combustion area and mixes with the combustion-supporting gas discharged from the wind gathering ring 431. Due to the unique design of the flow dispersing assembly, the combustion-supporting gas and the gas are fully interpenetrated and mixed in the combustion area, and the mixing degree is extremely high. When the mixed gas is ignited, a high-efficiency and sufficient combustion process is realized in the combustion area.

Claims

1. An adjustable burner for an annealing furnace, comprising a gas cylinder (1) and an auxiliary cylinder (2), the outer side of the gas cylinder (1) being fixedly sleeved with the auxiliary cylinder (2), characterized in that, One end of the combustion cylinder (2) is fixed with a filling column (3), and the end of the gas cylinder (1), the combustion cylinder (2) and the filling column (3) is mixed with the combustion gas through the flow assembly (4); Wherein, the flow assembly (4) includes an internal diffusion cover (41) fixed at the end of the filling column (3), an external diffusion cover (42) fixed at the end of the gas cylinder (1) and a protective cover (43) fixed at the end of the combustion cylinder (2), the internal diffusion cover (41) and the external diffusion cover (42) form a gas passage (44), the external diffusion cover (42) and the protective cover (43) form a combustion passage (45), and the external diffusion cover (42) is densely covered with external flow guide holes (421), and the internal diffusion cover (41) is densely covered with internal flow guide holes (411), so that the combustion gas passing through the external flow guide holes (421) is mixed with the gas in the gas passage (44) and then guided out through the internal flow guide holes (411).

2. The adjustable burner for an annealing furnace according to claim 1, characterized in that: The end of the protective cover (43) is fixed with a wind gathering ring (431) which gradually narrows along the gas flow direction.

3. The adjustable burner of claim 1, wherein: The width of the gas passage (44) and the combustion passage (45) gradually narrows along the gas flow direction.

4. The adjustable burner of claim 1, wherein: The external flow guide holes (421) and the internal flow guide holes (411) are distributed in staggered positions.

5. The adjustable burner of claim 1, wherein: The side wall of the combustion cylinder (2) is fixedly embedded with a combustion pipe (21) and a gas pipe (22), and the end of the gas pipe (22) is connected with the gas cylinder (1), wherein the gas flow direction of the gas pipe (22) is tangent to the inner wall of the gas cylinder (1), and the gas flow direction of the combustion pipe (21) is tangent to the inner wall of the combustion cylinder (2).

6. An adjustable burner for an annealing furnace according to claim 5, characterized in that: The gas cylinder (1) and the filling column (3) are fixedly connected with a porous gas flow uniform plate (5), and the porous gas flow uniform plate (5) is located between the gas passage (44) and the gas pipe (22).

7. An adjustable burner for an annealing furnace according to claim 5, characterized in that: The gas cylinder (1) and the combustion cylinder (2) are fixedly connected with a porous gas flow uniform plate (6), and the porous gas flow uniform plate (6) is located between the combustion passage (45) and the combustion pipe (21). The gas cylinder (1) and the combustion cylinder (2) are fixedly connected with a porous gas flow uniform plate (6), and the porous gas flow uniform plate (6) is located between the combustion passage (45) and the combustion pipe (21).

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