Oxygen-enriched mixer applied to oxygen-enriched combustion-supporting air system

Abstract

The utility model belongs to the technical field of oxygen-enriched mixing, and particularly relates to an oxygen-enriched mixer applied to an oxygen-enriched combustion-supporting air system, which at least comprises a cylinder body with one end connected with an air pipeline, the cylinder body of the oxygen-enriched mixer is coaxial with the air pipeline, the oxygen-enriched mixer is further provided with an oxygen pipeline and a disturbance blade, the oxygen pipeline extends into the cylinder body, and the disturbance blade extends into the cylinder body. The outlet end of the oxygen pipeline is parallel to the gas flowing direction of the barrel and is a perforated plate, the more than two groups of disturbance blades are sequentially arranged at the other end of the barrel, and each group of disturbance blades consists of a blade, a central blunt plate and an external flange; the center blunt plate is located on the axis of the barrel, the plane where the center blunt plate is located is perpendicular to the axis of the barrel, and the blades are spiral blades not perpendicular to the axis of the barrel. According to the scheme, the oxygen-enriched mixer is simple in structure, high in adaptability and small in occupied area, the barrel of the oxygen-enriched mixer is coaxial with the air pipeline, the service life is long, and efficient mixing of oxygen and air can be achieved within a short distance.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen-enriched mixing, and particularly relates to an oxygen-enriched mixer applied to an oxygen-enriched combustion-supporting air system. Background Art

[0002] Oxygen-enriched combustion technology uses oxygen-enriched air with a higher oxygen content than ordinary air (21%) to assist combustion. During the ordinary air-assisted combustion process, a large amount of nitrogen enters the combustion system with the air. As the combustion process proceeds, the nitrogen absorbs the heat of combustion and heats up, and then is discharged from the system at a high temperature, resulting in energy waste; in addition, when the combustion temperature is higher than 1200°C, nitrogen will also be oxidized, and the generated nitrogen oxides will damage the environment and are one of the main sources of acid rain. At the same time, they will corrode pipes, valves, fans and other equipment in the system. Under oxygen-enriched combustion conditions, the amount of nitrogen introduced during the combustion process is reduced, which saves nitrogen energy consumption while solving the problem of nitrogen oxide emissions from the source. The combustion products are mainly carbon dioxide and water. It can be seen that oxygen-enriched combustion is an efficient and energy-saving combustion technology. In oxygen-enriched combustion systems, oxygen and air are often mixed to provide the required oxygen-enriched air with different oxygen concentrations.

[0003] Therefore, oxygen-enriched mixers play an important role in industrial applications, especially in high-temperature combustion systems, medical and environmental engineering. The mixing effect of oxygen and air is an important indicator for evaluating oxygen-enriched mixers. In the combustion system, oxygen is mixed into the air duct with a flow rate of about 10Nm / s, or even up to 15m / s. If the gas mixing is only based on the disturbance of oxygen and air during the flow process, the pipe distance required to achieve uniform mixing is very large. For most companies, due to space limitations or limitations of furnace equipment, the distance required for the natural mixing of oxygen and air cannot be met. Therefore, a variety of mixers that improve the gas mixing efficiency through structural means have been developed one after another.

[0004] Chinese utility model patent "CN218795161U A new type of blast furnace gas oxygen-enriched mixer" discloses a new type of blast furnace gas oxygen-enriched mixer. The air pipes at both ends of the mixer inlet and outlet are staggered in height or horizontal direction, oxygen enters from the side of the mixer, and air and oxygen are mixed in the mixer and flow out along the outlet pipe. The disadvantage of this mixer is that the elevation or horizontal direction of the air pipe is eccentric during the construction process, welding stress is prone to occur, gas leakage is easy to occur after a long time, the service life is short and it is inconvenient to replace. Summary of the invention

[0005] The utility model aims to solve the defects of the prior art and provide an oxygen-enriched mixer with a simple structure, flexible use, strong adaptability, a cylinder of an oxygen-enriched mixer coaxial with an air duct, a long service life and the ability to achieve efficient mixing of oxygen and air within a short distance. The specific technical scheme adopted is: an oxygen-enriched mixer applied to an oxygen-enriched combustion and combustion-supporting air system, comprising at least a cylinder connected to an air duct at one end, the cylinder of the oxygen-enriched mixer being coaxial with the air duct, the oxygen-enriched mixer also being provided with an oxygen duct and a disturbance blade, the oxygen duct extending into the cylinder, the outlet end of the oxygen duct being parallel to the gas flow direction of the cylinder, the outlet end of the oxygen duct being a porous plate, two or more groups of disturbance blades being sequentially arranged at the other end of the cylinder, each group of disturbance blades being composed of blades, a central blunt plate and an external flange, the central blunt plate being located at the axis of the cylinder and the plane where the central blunt plate is located being perpendicular to the axis of the cylinder, the blades being spiral blades that are not perpendicular to the axis of the cylinder; the two or more groups of disturbance blades at least include two groups of blades with opposite spiral directions, and the blade setting positions of the two or more groups of disturbance blades do not overlap.

[0006] Moreover, flange structures are provided at both ends of the cylinder, and the contact surfaces of the cylinder and the air duct have the same shape.

[0007] Moreover, the oxygen pipeline is in an "L" shape, the inlet end of the oxygen pipeline is perpendicular to the gas flow direction of the cylinder, and the outlet end of the oxygen pipeline is coaxial with the cylinder.

[0008] Moreover, the two groups of blades with opposite spiral directions include a group of spiral blades with a left spiral angle of 15° and a group of spiral blades with a right spiral angle of 15°.

[0009] Moreover, each set of disturbance blades contains 6 to 8 blades.

[0010] Moreover, the oxygen-enriched mixer is made of high-temperature resistant stainless steel.

[0011] Moreover, the outlet end of the oxygen pipeline is an expanded diameter structure.

[0012] Compared with the prior art, this technical solution has the following beneficial effects:

[0013] 1. The cylinder of the oxygen-enriched mixer of this scheme is coaxial with the air duct, and the diameter of the cylinder is the same as the diameter of the air duct (if the air duct is not circular, it can also be designed into a shape matching the cross-section of the air duct according to actual conditions). One end of the cylinder is connected to the air duct by a flange, which solves the problem of welding stress that is easy to occur during the construction of the air duct in the prior art "CN218795161U".

[0014] 2. The oxygen-enriched mixer of this scheme includes multiple groups of disturbance blades, and the disturbance blades have flange structures on the outside, which can be firmly installed on the other end of the oxygen-enriched mixer. The disturbance blades are used to change the flow direction of the mixed gas.

[0015] 3. The two or more groups of disturbance blades in this scheme include at least two groups of blades with opposite spiral directions, and the blade setting positions of the two or more groups of disturbance blades do not overlap, that is, the blades have different inclination directions and installation angles, which can achieve gas disturbance within a short distance.

[0016] 4. The outlet end of the oxygen pipeline is a porous plate with an expanded diameter structure, which is more conducive to the diffusion and spraying of oxygen; the outlet end of the oxygen pipeline is parallel to the gas flow direction of the cylinder, which is more conducive to the mixing of oxygen and air in the cylinder.

[0017] 5. The oxygen-enriched mixer of this scheme is made of high-temperature resistant stainless steel and can be used in high-temperature air combustion-supporting systems.

[0018] 6. The oxygen-enriched mixer of this scheme has a simple structure, strong adaptability, small footprint, simple construction, long service life, and can achieve efficient mixing within a short distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment.

[0020] Figure 2 for Figure 1 A-direction view, where the left picture (1) and the right picture (2) are two groups of disturbance blades, respectively, whose blades have opposite spiral directions and the blade setting positions do not overlap.

[0021] Figure 3 A schematic diagram of the side structure of a set of disturbance blades.

[0022] Figure 4 for Figure 1 BB direction view.

[0023] Explanation of the reference numerals: 1—oxygen; 2—combustion air; 3—cylinder; 4—oxygen pipe; 5—flange structure; 6—disturbance blade; 7—central blunt plate; 8—blade; 9—external flange; 10—porous plate. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0025] An oxygen-enriched mixer used in an oxygen-enriched combustion air system. Usually, the air pipe of the combustion air system is a cylinder structure, and the oxygen-enriched mixer is also designed as the same cylinder as the air pipe. Figure 1The flow directions of oxygen and air are shown by arrows. The left end of the cylinder of the oxygen-enriched mixer is connected to the air pipe, and the combustion-supporting air 2 enters the cylinder 3 from the left. The cylinder of the oxygen-enriched mixer is coaxial with the air pipe. The oxygen-enriched mixer is also provided with an oxygen pipe. The oxygen pipe 4 extends into the cylinder so that oxygen 1 enters the cylinder from the oxygen pipe, and the outlet end of the oxygen pipe is parallel to the gas flow direction of the cylinder. The outlet end of the oxygen pipe is a porous plate 10 and is an expanded diameter structure, as shown in FIG. Figure 4 As shown, it is more conducive to the diffusion and ejection of oxygen.

[0026] The oxygen-enriched mixer is also provided with two or more sets of disturbance blades 6, which are sequentially arranged at the right end of the cylinder. The structure of the disturbance blades is as follows: Figure 2 and Figure 3 As shown, each group of disturbance blades consists of blades 8, a central blunt plate 7 and an external flange 9. The central blunt plate is located at the axis of the cylinder and the plane where the central blunt plate is located is perpendicular to the axis of the cylinder. The blades are spiral blades that are not perpendicular to the axis of the cylinder; more than two groups of disturbance blades include at least two groups of blades with opposite spiral directions, and the blade setting positions of more than two groups of disturbance blades do not overlap; the two groups of blades with opposite spiral directions include a group of spiral blades that rotate 15° to the left and a group of spiral blades that rotate 15° to the right.

[0027] Moreover, flange structures 5 are provided at both ends of the cylinder, and the contact surfaces of the cylinder and the air duct have the same shape. The cylinder and the air duct, and the cylinder and the disturbance blade are all connected by flanges.

[0028] Preferably, the oxygen pipeline is in an "L" shape, the inlet end of the oxygen pipeline is perpendicular to the gas flow direction of the cylinder, and the outlet end of the oxygen pipeline is coaxial with the cylinder.

[0029] Preferably, each set of disturbance blades contains 6 to 8 blades.

[0030] Preferably, the oxygen-enriched mixer is made of high temperature resistant stainless steel.

[0031] During the use of the oxygen-enriched mixer of this scheme, when the air flows from left to right, oxygen enters the mixer from a vertical direction and is ejected in a direction coaxial with the air. When the oxygen is ejected, it passes through the porous plate and is broken up, which helps the initial mixing of oxygen and air. When the mixed gas flows out of the mixer from left to right, it passes through the disturbance blade group. The first group of disturbance blades adopts a left-handed 15° structure, so that the mixed gas swirls out to the left. A blunt plate is set at the center of the disturbance blade, so that the oxygen ejected from the center rebounds after hitting the blunt plate, and swirls out after mixing with the mixed gas again. Immediately following the first group of disturbance blades is the second group of disturbance blades, which adopts a right-handed 15° structure, and the blade installation angle is staggered with the first group (that is, the blade setting positions of different groups do not overlap in the direction of the cylinder axis). When the mixed gas flows out from the first group of disturbance blades, it is left-handed. When it encounters the second group of disturbance blades, the airflow direction is forced to change to right-handed flow, which more effectively improves the gas mixing effect. According to actual needs, more groups of disturbance blades with different rotation directions and different angles can also be set.

[0032] In summary, the beneficial effects of this technical solution are as follows:

[0033] 1. The cylinder of the oxygen-enriched mixer of this scheme is coaxial with the air duct, and the diameter of the cylinder is the same as the diameter of the air duct (if the air duct is not circular, it can also be designed into a shape matching the cross-section of the air duct according to actual conditions). One end of the cylinder is connected to the air duct by a flange, which solves the problem of welding stress that is easy to occur during the construction of the air duct in the prior art "CN218795161U".

[0034] 2. The oxygen-enriched mixer of this scheme includes multiple groups of disturbance blades, and the disturbance blades have flange structures on the outside, which can be firmly installed on the other end of the oxygen-enriched mixer. The disturbance blades are used to change the flow direction of the mixed gas.

[0035] 3. The two or more groups of disturbance blades in this scheme include at least two groups of blades with opposite spiral directions, and the blade setting positions of the two or more groups of disturbance blades do not overlap, that is, the blades have different inclination directions and installation angles, which can achieve gas disturbance within a short distance.

[0036] 4. The outlet end of the oxygen pipeline is a porous plate with an expanded diameter structure, which is more conducive to the diffusion and spraying of oxygen; the outlet end of the oxygen pipeline is parallel to the gas flow direction of the cylinder, which is more conducive to the mixing of oxygen and air in the cylinder.

[0037] 5. The oxygen-enriched mixer of this scheme is made of high-temperature resistant stainless steel and can be used in high-temperature air combustion-supporting systems.

[0038] 6. The oxygen-enriched mixer of this scheme has a simple structure, strong adaptability, small footprint, simple construction, long service life, and can achieve efficient mixing within a short distance.

Claims

1. An oxygen-enriched mixer used in an oxygen-enriched combustion air system, comprising at least one end of a cylinder connected to an air pipe, characterized in that: The cylinder of the oxygen-enriched mixer is coaxial with the air duct. The oxygen-enriched mixer is also provided with an oxygen duct and disturbance blades. The oxygen duct extends into the cylinder. The outlet end of the oxygen duct is parallel to the gas flow direction of the cylinder. The outlet end of the oxygen duct is a porous plate. Two or more groups of disturbance blades are sequentially arranged at the other end of the cylinder. Each group of disturbance blades consists of blades, a central blunt plate and an external flange. The central blunt plate is located at the axis of the cylinder and the plane where the central blunt plate is located is perpendicular to the axis of the cylinder. The blades are spiral blades that are not perpendicular to the axis of the cylinder. The two or more groups of disturbance blades include at least two groups of blades with opposite spiral directions, and the blade setting positions of the two or more groups of disturbance blades do not overlap.

2. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: Flange structures are provided at both ends of the cylinder, and the contact surfaces of the cylinder and the air duct have the same shape.

3. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: The oxygen pipeline is "L" shaped, the inlet end of the oxygen pipeline is perpendicular to the gas flow direction of the cylinder, and the outlet end of the oxygen pipeline is coaxial with the cylinder.

4. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: The two groups of blades with opposite spiral directions include a group of spiral blades that spiral to the left at 15° and a group of spiral blades that spiral to the right at 15°.

5. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: Each set of disturbance blades contains 6 to 8 blades.

6. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: The oxygen-enriched mixer is made of high-temperature resistant stainless steel.

7. The oxygen-enriched mixer used in an oxygen-enriched combustion air system according to claim 1, characterized in that: The outlet end of the oxygen pipeline is an expanded diameter structure.

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