A soda furnace strong cyclone lateral injection type black liquor spray gun

Abstract

The application discloses a kind of alkali furnace strong cyclone lateral injection type black liquor spray gun, including black liquor spray gun and parent pipe are connected fixed by quick thread joint, and the other end of gun barrel is waist round pipe orifice and cyclone generator axis oblique 0 degrees to 30 degrees connection, gun barrel waist round pipe orifice inner wall and cyclone generator internal columnar cavity tangential through, the upper end of cyclone generator is closed structure, and the lower end of cyclone generator is laterally opened and is equipped with sector guide plate, sector guide plate corresponds with the side gap of cyclone generator lower part, black liquor is tangentially sprayed into cyclone generator internal columnar cavity with 0 degrees to 30 degrees incident angle by gun barrel, and strong cyclone is generated in columnar cavity and moves downward, and black liquor will be horizontally sector injection under the action of pressure and centrifugal force from the gap, black liquor droplet has horizontal and rotational kinetic energy, and black liquor droplet can extend falling trajectory and falling time during descending process, and it is beneficial to fully drying and burning of droplet.

Description

Technical Field

[0001] This invention relates to the field of combustion device technology for alkali recovery boilers, specifically to a strong swirling side-jet black liquor spray gun for alkali furnaces. Background Technology

[0002] Currently, black liquor pollution is the most serious problem in the alkali pulping and papermaking industry, and alkali recovery technology is the most effective method for treating it. The process involves first concentrating the black liquor, then spraying it through a black liquor spray gun into an alkali recovery boiler for further drying and combustion. The concentrated black liquor is sprayed into the boiler and dried to a moisture content of 10-15%, then falls onto the boiler pad and burns, undergoing a reduction reaction to produce molten material from which usable alkali is recovered. The heat generated from the combustion of organic matter is absorbed by the boiler and converted into high-pressure steam. To establish stable operating conditions, the black liquor needs to be evenly distributed within the furnace and thoroughly dried to create conditions conducive to combustion on the boiler pad.

[0003] Theoretically, it is desirable for black liquor spray guns to atomize black liquor and extend the residence time of droplets during downward movement. There are two types of black liquor spray guns in the existing technology. The first is the commonly used reflector-type black liquor spray gun, in which black liquor flows out of the gun barrel at high speed, hits the reflector plate and disperses it, and the droplets gain horizontal kinetic energy to produce a projectile effect. Then, under the action of gravity, they fall in a parabolic trajectory. If it is possible to achieve a parabolic and spiral combined motion of droplets, and further extend the droplet fall time, improvements need to be made to the reflector-type black liquor spray gun. Secondly, there is the commonly used vortex-type black liquor lance. Black liquor enters the vortex generator at high speed from the lance barrel, generating rotational kinetic energy. Droplets are ejected from the bottom of the vortex generator at a certain cone angle downwards. The droplets are atomized and spiral downwards, lengthening their trajectory and prolonging the time it takes for them to reach the bottom. However, as the droplets are ejected downwards from the bottom of the vortex generator, more than half of them gain downward kinetic energy, which further accelerates their downward movement, causing some droplets to reach the bottom too quickly. To achieve a horizontal spiral ejection of the droplets, resulting in a parabolic and spiral combined motion upon descent, improvements to the vortex-type black liquor lance are necessary. Furthermore, regardless of whether it's a reflective or vortex-type black liquor lance, there is a risk of spraying black liquor onto the furnace wall if not handled carefully. Therefore, it is necessary to design a new strong vortex side-jet black liquor lance for alkali furnaces to solve these problems. Summary of the Invention

[0004] The present invention aims to provide a strong swirling side-jet black liquor spray gun for alkali furnaces to solve at least one technical problem existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A black liquor spray gun for a strong swirling side-jet alkali furnace includes a quick-connect threaded connector, a pipe connector, a gun barrel, and a swirling generator. The pipe connector is provided at the end of the gun barrel. The gun barrel and the pipe connector are connected by a first fillet weld. The end of the pipe connector has a sealing end face and is connected and fixed to the main pipe by a quick-connect threaded connector and a sealing gasket. The gun barrel has an elbow in the middle and a pipe end with a flattened oval gradient structure and a chamfer at the other end. The swirling generator is arranged adjacent to the pipe end with the flattened oval gradient structure. The gun barrel and the swirling generator are connected by a second fillet weld.

[0007] Preferably, the vortex generator includes a left-handed vortex generator structure and a right-handed vortex generator structure. When the vortex generator rotates to the left, it is a left-handed vortex generator structure, and when the vortex generator rotates to the right, it is a right-handed vortex generator structure.

[0008] Preferably, the end of the gun barrel is obliquely intersecting the axis of the left-handed vortex generator structure by 0 to 30 degrees. The outer circle of the left-handed vortex generator structure is provided with a first protrusion tangent to it. The end face of the first protrusion is obliquely intersecting the axis of the left-handed vortex generator structure by 0 to 30 degrees. The gun barrel and the left-handed vortex generator structure are connected by a second fillet weld. The left-handed vortex generator structure is provided with a first columnar cavity inside. The end face of the first protrusion on the side of the left-handed vortex generator structure is provided with a first oval hole tangent to the inner cavity. The upper end of the left-handed vortex generator structure is a closed structure, and the lower end is provided with a first notch on the side. The lower end of the left-handed vortex generator structure is provided with a first guide plate, and is connected to the first guide plate by a third fillet weld. The first guide plate is fan-shaped and corresponds to the first notch on the lower side of the left-handed vortex generator structure.

[0009] Preferably, the barrel is obliquely intersecting the axis of the right-hand vortex generator structure by 0 to 30 degrees. The outer circumference of the right-hand vortex generator structure is provided with a second protrusion tangent to it. The end face of the second protrusion is obliquely intersecting the axis of the right-hand vortex generator structure by 0 to 30 degrees. The barrel and the right-hand vortex generator structure are connected by a second fillet weld. The right-hand vortex generator structure has a second cylindrical cavity inside. The end face of the second protrusion on the side of the right-hand vortex generator structure has a second oval hole tangent to the inner cavity. The upper end of the right-hand vortex generator structure is a closed structure, and the lower end has a second notch on the side. The lower end of the right-hand vortex generator structure is equipped with a second guide plate, and is connected to the second guide plate by a third fillet weld. The second guide plate is fan-shaped and corresponds to the second notch on the lower side of the right-hand vortex generator structure.

[0010] Preferably, the first notch has a changeable structure, and the opening direction, opening length and opening height of the first notch can all be changed.

[0011] Preferably, the second notch has a variable structure, and the opening direction, opening length, and opening height of the second notch can all be changed.

[0012] Preferably, the materials of the black liquor spray gun quick threaded connector, pipe connector, gun barrel, left-hand vortex generator structure, right-hand vortex generator structure, first guide plate, and second guide plate are at least one of austenitic stainless steel, duplex stainless steel, and nickel-based alloy.

[0013] Compared with the prior art, the strong swirling side-jet black liquor spray gun for alkali furnaces provided by the present invention has the following beneficial effects:

[0014] 1. By setting up a cyclone generator, the black liquor enters the cyclone tangentially through the conduit and will generate strong rotation and spiral forward downward. When the spiral-forward black liquor passes through the lateral opening at the bottom of the cyclone, it will generate horizontal atomization and diffusion effects. The droplets can achieve parabolic and spiral combined motion, which is conducive to prolonging its falling trajectory and falling time in the furnace, and is conducive to the full drying and combustion of black liquor droplets.

[0015] 2. By setting up a cyclone generator, the height, size, and direction of the lateral opening below the cyclone generator can control the black liquor spreading angle, flow rate, and intensity, effectively preventing the black liquor from hitting the furnace wall.

[0016] 3. By setting up a vortex generator, which has no other parts inside, blockage in the black liquor spray gun cavity can be effectively avoided.

[0017] 4. The present invention has a simple structure and is easy to manufacture. Attached Figure Description

[0018] Figure 1 Three-view diagrams of the left-handed vortex generator structure of the strong vortex side-jet black liquor spray gun for alkali furnace according to the present invention;

[0019] Figure 2 This is a three-dimensional view of the left-hand swirling generator structure and the first guide plate assembly of the strong swirling side-jet black liquor spray gun for alkali furnace according to the present invention.

[0020] Figure 3 This is a three-dimensional cross-sectional view of the left-hand swirling generator structure and the first guide plate assembly of the strong swirling side-jet black liquor spray gun for alkali furnace according to the present invention.

[0021] Figure 4 These are three views of the right-hand swirling generator structure of the strong swirling side-jet black liquor spray gun for alkali furnace described in this invention;

[0022] Figure 5This is a three-dimensional view of the right-hand swirling generator structure and the second guide plate assembly of the strong swirling side-jet black liquor spray gun for alkali furnace according to the present invention.

[0023] Figure 6 This is a three-dimensional cross-sectional view of the right-hand swirling generator structure and the second guide plate assembly of the strong swirling side-jet black liquor spray gun for alkali furnace described in this invention.

[0024] Figure 7 This is a three-dimensional view of the barrel of the alkali furnace strong vortex side-jet black liquor spray gun described in this invention;

[0025] In the diagram: 1. Quick-connect threaded connector; 2. Pipe connector; 3. Gun barrel; 3a. Elbow; 3b. End flattened into a gradually tapering oval shape; 3c. End chamfer; 4. Left-handed vortex generator structure; 4a. First cylindrical cavity; 4b. First oval hole tangent to the inner cavity; 4c. First notch; 4d. Protrusion; 4e. First guide plate; 5. Right-handed vortex generator structure; 5a. Second cylindrical cavity; 5b. Second oval hole tangent to the inner cavity; 5c. Second notch; 5d. Second protrusion; 5e. Second guide plate; 6. First fillet weld; 7. Second fillet weld; 8. Third fillet weld. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Please see the appendix Figure 1-7 As shown, this embodiment provides a strong swirling side-jet black liquor spray gun for an alkali furnace, comprising a quick-connect threaded connector 1, a pipe connector 2, a gun barrel 3, and a swirling generator. The gun barrel 3 is provided with a pipe connector 2 at its end. The gun barrel 3 and the pipe connector 2 are connected by a first fillet weld 6. The end of the pipe connector 2 has a sealing end face and is connected and fixed to the main pipe by the quick-connect threaded connector 1 and a sealing gasket. The gun barrel 3 is provided with an elbow 3a in the middle and a pipe end with a flattened oval gradient structure 3b and a chamfer 3c at the other end. The swirling generator is arranged adjacent to the pipe end with the flattened oval gradient structure 3b. The gun barrel 3 and the swirling generator are connected by a second fillet weld 7.

[0029] In this embodiment, the black liquor enters the hydrocyclone tangentially through the conduit, generating a strong rotation and spiraling downwards. As the spiraling black liquor passes through the lateral opening at the bottom of the hydrocyclone, it produces a horizontal atomization and diffusion effect. The droplets can achieve a parabolic and spiral combined motion, which helps to prolong their falling trajectory and falling time in the furnace, and is beneficial to the complete drying and combustion of the black liquor droplets. There are no other parts inside the cyclone generator cavity, which can effectively avoid clogging in the cavity of the black liquor spray gun. The present invention has a simple structure and is easy to manufacture.

[0030] In a specific embodiment, such as Figure 1 , 4 As shown, the vortex generator includes a left-handed vortex generator structure 4 and a right-handed vortex generator structure 5. When the vortex generator rotates to the left, it is a left-handed vortex generator structure 4, and when the vortex generator rotates to the right, it is a right-handed vortex generator structure 5.

[0031] In a specific embodiment, such as Figure 1-3 As shown, the end of the barrel 3 is obliquely intersecting the axis of the left-handed vortex generator structure 4 by 0 to 30 degrees. The outer circumference of the left-handed vortex generator structure 4 is provided with a first protrusion 4d tangent to it. The end face of the first protrusion 4d is obliquely intersecting the axis of the left-handed vortex generator structure 4 by 0 to 30 degrees. The barrel 3 and the left-handed vortex generator structure 4 are connected by a fillet weld 7. The left-handed vortex generator structure 4 has a first cylindrical cavity 4a inside. The end face of the first protrusion 4d on the side of the flow generator structure 4 has a first oval hole tangent to the inner cavity 4b. The upper end of the left-handed swirling flow generator structure 4 is a closed structure, and the lower end has a first notch 4c on the side. The lower end of the left-handed swirling flow generator structure 4 is equipped with a first guide plate 4e, and is connected to the first guide plate 4e by a third corner weld 8. The first guide plate 4e is fan-shaped and corresponds to the first notch 4c on the lower side of the left-handed swirling flow generator structure 4.

[0032] In a specific embodiment, such as Figure 4-6As shown, the barrel 3 is obliquely intersecting the axis of the right-hand vortex generator structure 5 by 0 to 30 degrees. The outer circumference of the right-hand vortex generator structure 5 is provided with a second protrusion 5d tangent to it. The end face of the second protrusion 5d is obliquely intersecting the axis of the right-hand vortex generator structure 5 by 0 to 30 degrees. The barrel 3 and the right-hand vortex generator structure 5 are connected by a second fillet weld 7. The right-hand vortex generator structure 5 has a second cylindrical cavity 5a inside. The right-hand vortex... The end face of the second protrusion 5d on the side of the generator structure 5 has a second oval hole tangent to the inner cavity 5b. The upper end of the right-hand swirling generator structure 5 is a closed structure, and the lower end has a second notch 5c on the side. The lower end of the right-hand swirling generator structure 5 is equipped with a second guide plate 5e, and is connected to the second guide plate 5e by a third corner weld 8. The second guide plate 5e is fan-shaped and corresponds to the second notch 5c on the lower side of the right-hand swirling generator structure 5.

[0033] In a specific embodiment, such as Figure 1-3 As shown, taking the left-handed black liquor spray gun of the left-handed vortex generator structure 4 as an example, the process includes the following:

[0034] S1: Connect and fix the strong swirling side-jet black liquor spray gun of the alkali furnace to the main pipe through quick threaded connector 1 and sealing gasket.

[0035] S2: The black liquid is injected tangentially into the first cylindrical cavity 4a inside the left-hand side of the vortex generator through the gun barrel 3 at an incident angle of 0-30 degrees. The black liquid generates a strong left-hand side vortex inside the first cylindrical cavity 4a inside the left-hand side of the vortex generator and moves downward to the upper surface of the first guide plate 4e.

[0036] S3: When the black liquid moving downwards spirals through the first notch 4c on the left-hand side of the vortex generator and the upper surface of the first guide plate 4e, the black liquid will generate a horizontal fan-shaped jet under the action of centrifugal force, and the droplets have horizontal and spiral kinetic energy.

[0037] S4: The droplets have both horizontal and spiral kinetic energy, which helps to prolong the droplet's falling trajectory and falling time in the furnace, and is conducive to the complete drying and combustion of the droplets;

[0038] In a specific embodiment, such as Figure 1-3 As shown, the first notch 4c is a variable structure, and the opening direction, opening length and opening height of the first notch 4c can be changed.

[0039] In this embodiment, changing the opening direction of the first notch 4c can affect the general direction of the fan-shaped area of ​​the black liquor after it is sprayed from the black liquor spray gun; changing the opening length of the first notch 4c can affect the width of the fan-shaped area of ​​the black liquor after it is sprayed from the black liquor spray gun; changing the opening height of the first notch 4c can affect the flow rate, spray distance and atomization effect of the black liquor sprayed from the black liquor spray gun. By controlling the height, size and opening direction of the lateral opening below the left-hand vortex generator 4, the black liquor spreading angle, flow rate and intensity can be controlled, which can effectively prevent the black liquor from hitting the furnace wall.

[0040] In a specific embodiment, such as Figure 4-6 As shown, the second notch 5c is a variable structure, and the opening direction, opening length and opening height of the second notch 5c can be changed.

[0041] In this embodiment, changing the opening direction of the second notch 5c can affect the general direction of the fan-shaped area of ​​the black liquor after it is sprayed from the black liquor spray gun; changing the opening length of the second notch 5c can affect the width of the fan-shaped area of ​​the black liquor after it is sprayed from the black liquor spray gun; changing the opening height of the second notch 5c can affect the flow rate, spray distance and atomization effect of the black liquor sprayed from the black liquor spray gun; by controlling the height, size and opening direction of the lateral opening below the right-hand vortex generator 5, the black liquor spreading angle, flow rate and intensity can be controlled, which can effectively prevent the black liquor from hitting the furnace wall.

[0042] In a specific embodiment, such as Figure 1-7 As shown, the materials of the black liquor spray gun quick threaded connector 1, pipe connector 2, gun barrel 3, left-hand vortex generator structure 4, right-hand vortex generator structure 5, first guide plate 4e, and second guide plate 5e are at least one of austenitic stainless steel, duplex stainless steel, and nickel-based alloy.

[0043] In this embodiment, since the black liquor spray gun is located inside the alkali furnace, where the ambient temperature is nearly 1000 degrees Celsius, and the black liquor contains highly corrosive substances and extremely high chloride ion concentrations, the materials selected for the black liquor spray gun quick-threaded connector 1, pipe connector 2, gun barrel 3, left-handed vortex generator structure 4, right-handed vortex generator structure 5, first guide plate 4e, and second guide plate 5e are materials resistant to high temperatures, highly corrosive substances, and extremely high chloride ion corrosion. The selectable materials, ranked from lowest to highest corrosion resistance, are: austenitic stainless steel, duplex stainless steel, etc. With the improvement of the high-temperature corrosion resistance of the selected materials, the service life will also increase accordingly. Nickel-based materials are used for overlay welding on the front end of the gun barrel 3, the outer surface of the left-hand vortex generator structure 4, the outer surface of the right-hand vortex generator structure 5, the first guide plate 4e, and the outer surface of the second guide plate 5e, so that the surface nickel content reaches more than 55%, which improves the resistance of the black liquor spray gun tip to high temperature and strong alkali corrosion. The stainless steel and nickel-based materials used need to undergo solution heat treatment to achieve the best resistance to strong corrosive substances and ultra-high chloride ion corrosion performance.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A soda furnace high-velocity cyclonic lateral injection black liquor lance characterized by: The application relates to a gun barrel, which comprises a quick thread joint (1), a pipe joint (2), a gun barrel (3) and a swirl generator, the gun barrel (3) is provided with the pipe joint (2) at the end, the gun barrel (3) and the pipe joint (2) are connected through a first fillet weld (6), the end of the pipe joint (2) is provided with a sealing end face, the gun barrel (3) is connected and fixed with a mother pipe through the quick thread joint (1) and a sealing gasket, a bend (3a) is arranged in the middle of the gun barrel (3), the other end is provided with a pipe end flattened waist round gradually changing structure (3b) and an end chamfer (3c), the swirl generator is arranged adjacent to the pipe end flattened waist round gradually changing structure (3b), and the gun barrel (3) and the swirl generator are connected through a second fillet weld (7). The swirl generator comprises a left-rotating swirl generator structure (4) and a right-rotating swirl generator structure (5), the left-rotating swirl generator structure (4) is arranged when the swirl generator rotates to the left, and the right-rotating swirl generator structure (5) is arranged when the swirl generator rotates to the right. The axis of the left-rotating swirl generator structure (4) is inclined to the end of the gun barrel (3) by 0-30 degrees, the outer circle of the left-rotating swirl generator structure (4) is provided with a first protrusion (4d) tangent to the left-rotating swirl generator structure (4), the end face of the first protrusion (4d) is inclined to the axis of the left-rotating swirl generator structure (4) by 0-30 degrees, the gun barrel (3) and the left-rotating swirl generator structure (4) are connected through the second fillet weld (7), the left-rotating swirl generator structure (4) is internally provided with a first columnar cavity (4a), the end face of the first protrusion (4d) of the side face of the left-rotating swirl generator structure (4) is provided with a first waist round hole (4b) tangent to the inner cavity, the upper end of the left-rotating swirl generator structure (4) is a closed structure, and the lower end is laterally provided with a first notch (4c), the first guiding plate (4e) is arranged at the lower end of the left-rotating swirl generator structure (4) and is connected through a third fillet weld (8), the first guiding plate (4e) is fan-shaped and corresponds to the first notch (4c) of the lower side face of the left-rotating swirl generator structure (4). The materials of the quick thread joint (1), the pipe joint (2), the gun barrel (3), the left-rotating swirl generator structure (4), the right-rotating swirl generator structure (5), the first guiding plate (4e) and the second guiding plate (5e) are at least one of austenitic stainless steel material, duplex stainless steel material and nickel-based alloy material.

2. A strongly swirling side injection black liquor lance for an alkali furnace according to claim 1, characterized in that: The gun barrel (3) is inclined to the axis of the right-handed rotational flow generator structure (5) by 0-30 degrees, the outer circle of the right-handed rotational flow generator structure (5) is provided with a second protrusion (5d) tangent to it, the end face of the second protrusion (5d) is inclined to the axis of the right-handed rotational flow generator structure (5) by 0-30 degrees, the gun barrel (3) is connected to the right-handed rotational flow generator structure (5) by a second fillet weld (7), the right-handed rotational flow generator structure (5) is internally provided with a second cylindrical cavity (5a), the end face of the side second protrusion (5d) of the right-handed rotational flow generator structure (5) is provided with a second waist round hole (5b) and is tangent to the inner cavity, the upper end of the right-handed rotational flow generator structure (5) is a closed structure, and the lower end is laterally provided with a second notch (5c), the lower end of the right-handed rotational flow generator structure (5) is provided with a second guide plate (5e), and is connected to the second guide plate (5e) by a third fillet weld (8), the second guide plate (5e) is fan-shaped, and corresponds to the second notch (5c) on the lower side of the right-handed rotational flow generator structure (5).

3. A strongly swirling side injection black liquor lance for an alkali furnace according to claim 1, characterized in that: The first notch (4c) is provided with variable opening direction, opening length and opening height.

4. A strongly swirling side injection black liquor lance for an alkali furnace according to claim 2, characterized in that: The second notch (5c) is provided with variable opening direction, opening length and opening height.

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