Three-stage adjustable baffle type cyclone inertia composite coarse powder separator

Abstract

The utility model discloses a three -stage adjustable baffle formula cyclone inertia compound coarse powder separator, lower layer baffle is installed in the import pipe, middle layer baffle and upper layer baffle are installed in the separator casing respectively, and the coal powder in the import pipe is separated and homogenized by the lower layer baffle compulsorily, and the horn mouth guides the coal powder to spread evenly upward, reduces the separation burden of middle layer baffle and upper layer baffle, reduces the coal powder flow rate, makes the coal powder form a stable flow field that the flow rate and concentration are relatively even in the separator casing, prevents the coal powder airflow from forming the partial flow in the separator casing, guarantees the coal powder to be separated finely and efficiently in the separator casing, reduces the wear rate of middle layer baffle and upper layer baffle, prevents the airflow of horn mouth from sucking the separated coarse powder with the anti -mixing inner sleeve, prevents the separated coarse powder from mixing into the ascending airflow, guarantees the coarse powder particle separated by lower layer baffle to fall into the return powder hopper from annular powder falling gap, improves the reliability and effectiveness of coal powder separation.

Description

Technical Field

[0001] This utility model relates to a three-stage adjustable baffle-type cyclone inertial composite coarse powder separator, belonging to the technical field of coal powder coarse and fine particle separation in coal-fired power plant boiler pulverizing systems. Background Technology

[0002] In the ball mill pulverizing system of a coal-fired power plant, the pulverized coal-air mixture at the mill outlet must be separated by a coarse powder separator. Qualified fine powder enters the boiler for combustion with the airflow, while excessively coarse particles are separated and returned to the mill for further grinding.

[0003] The axial coarse powder separator mainly consists of a riser inlet, an internal hollow cone, an external conical shell, a coarse coal powder return pipe, upper and lower baffles, a top cover, and an outlet pipe. It relies on baffles to redirect the airflow and utilizes the impact of coarse powder particles due to their high inertia to achieve separation. However, it commonly suffers from a large deviation in the amount of powder discharged from the separator, resulting in unsatisfactory separation accuracy (particle size reduction).

[0004] When the pulverized coal gas flow directly diffuses into the separation chamber through the inlet pipe, it easily creates "flow deviation," resulting in an uneven flow field distribution inside the separator. This not only leads to poor separation performance in some areas but also causes localized erosion and wear on the baffles and shell in the high-speed airflow zone, significantly shortening the equipment's service life. Utility Model Content

[0005] The three-stage adjustable baffle-type cyclone inertial composite coarse powder separator provided by this utility model uses the lower baffle to forcibly separate and homogenize the coal powder in the inlet pipe, so that the coal powder forms a stable flow field with relatively uniform flow velocity and concentration in the separator shell, preventing the coal powder airflow from forming a bias flow in the separator shell, ensuring that the coal powder is finely and efficiently separated in the separator shell, reducing the wear rate of the middle and upper baffles, and using an anti-mixing inner sleeve to prevent the airflow at the funnel mouth from entraining the separated coarse powder, thereby improving the reliability and effectiveness of coal powder separation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A three-stage adjustable baffle-type cyclone inertial composite coarse powder separator includes a separator shell, an inner cone installed in the separator shell, an inlet pipe extending from the bottom into the separator shell, an outlet pipe extending from the top of the separator shell, and a powder return hopper connected to the bottom of the separator shell. The upper end of the inlet pipe is an upwardly flared bell mouth. The separator shell is equipped with an inclined middle baffle and an inclined upper baffle located above the middle baffle. The separator shell is characterized by having an inclined lower baffle installed in the inlet pipe and an anti-mixing inner sleeve located below the middle baffle in the separator shell. The bell mouth extends into the anti-mixing inner sleeve, and an annular powder drop gap is formed between the anti-mixing inner sleeve and the separator shell, which is connected to the powder return hopper.

[0007] Preferably, the lower baffles are evenly distributed circumferentially along the inlet pipe, and are installed obliquely in the inlet pipe via baffle shafts, with gaps forming between adjacent lower baffles for the passage of pulverized coal; the middle baffles are evenly distributed circumferentially along the inner wall of the separator shell, and are installed obliquely in the separator shell via baffle shafts, with gaps forming between adjacent middle baffles for the passage of pulverized coal; the upper baffles are evenly distributed circumferentially along the outer periphery of the inner cone, and are installed obliquely in the separator shell via baffle shafts, with gaps forming between adjacent upper baffles for the passage of pulverized coal.

[0008] Preferably, each of the baffle shafts is equipped with an electric adjuster that can drive the baffle shaft to rotate, and the tilt angle of the lower baffle, middle baffle and upper baffle is adjusted by the electric adjuster on the corresponding baffle shaft.

[0009] Preferably, the anti-mixing inner sleeve is a conical cylinder adapted to the shape of the bottom end of the separator housing, and the anti-mixing inner sleeve has multiple powder passage holes for coarse powder to pass through.

[0010] Preferably, the powder passage hole is a vertical strip-shaped hole opened downward from the top of the anti-mixing inner sleeve or a horizontal strip-shaped hole opened circumferentially from the middle of the anti-mixing inner sleeve.

[0011] The beneficial effects of this utility model are: This utility model discloses a three-stage adjustable baffle-type cyclone inertial composite coarse powder separator. The lower baffle is installed in the inlet pipe, while the middle and upper baffles are installed inside the separator shell. A high-speed coal powder gas flow enters through the inlet pipe and first collides with the lower baffle. Passing through the lower baffle generates tangential velocity, forming an upward vortex. Under centrifugal force, the largest and heaviest coarse powder particles in the mixture are separated and enter the annular powder drop gap. The coarse powder particles fall into the return hopper from the annular powder drop gap, forming the first stage of coal powder separation. The coal powder enters the separator body through the funnel-shaped opening, undergoes second-stage separation through the middle baffle, and third-stage separation through the upper baffle. The separated fine powder is guided by the inner cone and discharged from the outlet pipe, while the coarse powder enters along the inner wall of the separator shell. The coal powder falls through the annular gap and returns to the return hopper. The lower baffle forces the coal powder in the inlet pipe to be separated and homogenized. The bell mouth guides the coal powder to diffuse evenly upward, reducing the separation burden on the middle and upper baffles, reducing the coal powder flow rate, and forming a relatively uniform and stable flow field in the separator shell. This prevents the coal powder airflow from forming a bias flow in the separator shell, ensuring that the coal powder is finely and efficiently separated in the separator shell, reducing the wear rate of the middle and upper baffles. The anti-mixing inner sleeve prevents the airflow at the bell mouth from entraining the separated coarse powder, preventing the separated coarse powder from mixing into the rising airflow, and ensuring that the coarse powder particles separated by the lower baffle fall into the return hopper from the annular gap, improving the reliability and effectiveness of coal powder separation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a three-stage adjustable baffle-type cyclone inertial composite coarse powder separator in a specific implementation.

[0013] Figure 2 A schematic diagram showing that powder holes have been made on the inner sleeve to prevent mixing.

[0014] Figure 3 Another schematic diagram showing the powder holes opened on the inner sleeve to prevent mixing. Detailed Implementation

[0015] The following is combined Figures 1-3 The embodiments of this utility model will be described in detail below.

[0016] A three-stage adjustable baffle-type swirling inertial composite coarse powder separator includes a separator housing 1, an inner cone 2 installed in the separator housing 1, an inlet pipe 3 extending into the separator housing 1 from the bottom, an outlet pipe 4 extending out of the separator housing 1 from the top, and a return powder hopper 5 connected to the bottom of the separator housing 1. The upper end of the inlet pipe 3 is an upwardly flared bell mouth 31. The separator housing 1 is equipped with an inclined middle baffle 6 and an inclined upper baffle 7 located above the middle baffle 6. The separator housing is characterized in that: the inlet pipe is equipped with an inclined lower baffle 8, and the separator housing is equipped with an anti-mixing inner sleeve located below the middle baffle 6. The bell mouth 31 extends into the anti-mixing inner sleeve 9, and the anti-mixing inner sleeve 9 and the separator housing 1 form an annular powder drop gap 10 that communicates with the return powder hopper 5.

[0017] The three-stage adjustable baffle-type cyclone inertial composite coarse powder separator described above has a lower baffle 8 installed in the inlet pipe 3, and middle and upper baffles 6 and 7 respectively installed in the separator shell 1. High-speed coal powder airflow enters from the inlet pipe 3 and first collides with the lower baffle 8. Passing through the lower baffle 8, it generates tangential velocity, forming an upward vortex. Under centrifugal force, the largest and heaviest coarse powder particles in the mixture are separated and enter the annular powder drop gap 10. The coarse powder particles fall from the annular powder drop gap 10 into the return powder hopper 5, forming the first stage of coal powder separation. The coal powder enters the separator body from the bell mouth 31, undergoes second-stage separation via the middle baffle 6, and third-stage separation via the upper baffle 7. The separated fine powder is guided by the inner cone 2 and discharged from the outlet pipe 4, while the coarse powder flows along the inner wall of the separator shell 1. The coal powder enters the annular drop gap 10 and falls back into the return hopper 5. The lower baffle 8 forcibly separates and homogenizes the coal powder in the inlet pipe. The bell mouth 31 guides the coal powder to diffuse evenly upwards, reducing the separation burden on the middle baffle 6 and the upper baffle 7, reducing the coal powder flow rate, and forming a relatively uniform and stable flow field in the separator shell. This prevents the coal powder airflow from forming a bias flow in the separator shell, ensuring that the coal powder is finely and efficiently separated in the separator shell, reducing the wear rate of the middle and upper baffles. The anti-mixing inner sleeve 9 prevents the airflow from the bell mouth 31 from entraining the separated coarse powder, preventing the separated coarse powder from mixing into the rising airflow, and ensuring that the coarse powder particles separated by the lower baffle 8 fall from the annular drop gap 10 into the return hopper 5, thus improving the reliability and effectiveness of coal powder separation.

[0018] The lower baffles 8 are evenly distributed around the inlet pipe 3 and are installed obliquely in the inlet pipe 3 via baffle shafts 11, forming gaps between adjacent lower baffles 8 for the passage of pulverized coal. The middle baffles 6 are evenly distributed around the inner wall of the separator housing 1 and are installed obliquely in the separator housing 1 via baffle shafts 11, forming gaps between adjacent middle baffles 6 for the passage of pulverized coal. The upper baffles 7 are evenly distributed around the outer periphery of the inner cone 2 and are installed obliquely in the separator housing 1 via baffle shafts 11, forming gaps between adjacent upper baffles 7 for the passage of pulverized coal. The lower baffle 8, middle baffle 6, and upper baffle 7 are all inclined to ensure that when the pulverized coal airflow encounters the baffles, the pulverized coal will collide with the baffles and the coarse particles will be broken up and separated. The pulverized coal airflow passes through the gaps between adjacent baffles and generates a tangential velocity flow with the inclined baffles, forming a swirling upward flow. The coarse particles will be thrown out by the swirling flow and fall into the return hopper, while the fine particles will continue to rise with the pulverized coal gas. The pulverized coal is separated from bottom to top through the lower, middle, and upper baffles, which improves the pulverized coal separation accuracy, reduces the particle size of the separated fine particles, and improves the separation reliability.

[0019] Each of the baffle shafts 11 is equipped with an electric adjuster 12 that can drive the baffle shaft 11 to rotate. The lower baffle 8, the middle baffle 6, and the upper baffle 7 are respectively adjusted in tilt angle by the electric adjuster 12 on their respective baffle shafts 11. The electric adjuster 11 drives the baffle shaft 11 to rotate and adjust the tilt angle of the corresponding baffle on the baffle shaft 11, so that the tilt angle of the upper, middle, and lower baffles can be adjusted between 0 and 90 degrees to adapt to the separation requirements under different coal types and load conditions. It can also realize the separate adjustment of the tilt angle of the upper, middle, and lower baffles during the separation process to improve the separation efficiency.

[0020] The anti-mixing inner sleeve 9 is a conical cylinder adapted to the shape of the bottom end of the separator housing 1. Multiple powder passage holes 91 are provided on the anti-mixing inner sleeve to allow coarse powder to pass through. When the high-speed coal powder airflow encounters the lower baffle 8 and forms a primary separation, some of the separated large coarse powder particles are thrown onto the anti-mixing inner sleeve 9 as they move upwards with the swirling flow. These large coarse powder particles can then enter the annular powder drop gap 10 through the powder passage holes 91 and fall into the return powder hopper 5, further improving the separation efficiency.

[0021] The powder passage 91 is a vertical strip-shaped hole extending downwards from the top of the anti-mixing inner sleeve 9, or a horizontal strip-shaped hole extending circumferentially from the middle of the anti-mixing inner sleeve 9. For example... Figure 2 As shown, the powder passage hole 91 is a vertical strip-shaped hole opened downwards from the top of the anti-mixing inner sleeve 9; as Figure 3 As shown, the powder passage hole 91 is a transverse strip-shaped hole opened circumferentially from the middle of the anti-mixing inner sleeve 9. Both structures of the powder passage hole are easy to form.

[0022] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A three-stage adjustable baffle-type cyclone inertial composite coarse powder separator, comprising a separator shell, an inner cone installed in the separator shell, an inlet pipe extending from the bottom into the separator shell, an outlet pipe extending from the top of the separator shell, and a return powder hopper connected to the bottom end of the separator shell, wherein the upper end of the inlet pipe is an upwardly flared funnel, and the separator shell is equipped with an inclined middle baffle and an inclined upper baffle located above the middle baffle, characterized in that: The inlet pipe is equipped with an inclined lower baffle, and the separator housing is equipped with an anti-mixing inner sleeve located below the middle baffle. The flared mouth extends into the anti-mixing inner sleeve, and an annular powder drop gap is formed between the anti-mixing inner sleeve and the separator housing, which is connected to the powder return hopper.

2. The three-stage adjustable baffle type cyclone inertial composite coarse powder separator according to claim 1, characterized in that: The lower baffles are evenly distributed around the circumference of the inlet pipe and are installed obliquely in the inlet pipe via baffle shafts, forming gaps between adjacent lower baffles for the passage of pulverized coal. The middle baffles are evenly distributed around the circumference of the inner wall of the separator shell and are installed obliquely in the separator shell via baffle shafts, forming gaps between adjacent middle baffles for the passage of pulverized coal. The upper baffles are evenly distributed around the outer circumference of the inner cone and are installed obliquely in the separator shell via baffle shafts, forming gaps between adjacent upper baffles for the passage of pulverized coal.

3. The three-stage adjustable baffle type cyclone inertial composite coarse powder separator according to claim 2, characterized in that: Each of the baffle shafts is equipped with an electric adjuster that can drive the baffle shaft to rotate. The tilt angle of the lower baffle, middle baffle and upper baffle is adjusted by the electric adjuster on the corresponding baffle shaft.

4. The three-stage adjustable baffle type cyclone inertial composite coarse powder separator according to claim 1, characterized in that: The anti-mixing inner sleeve is a conical cylinder adapted to the shape of the bottom end of the separator housing. Multiple powder passage holes are provided on the anti-mixing inner sleeve to allow coarse powder to pass through.

5. The three-stage adjustable baffle type cyclone inertial composite coarse powder separator according to claim 4, characterized in that: The powder passage hole is a vertical strip-shaped hole opened downward from the top of the anti-mixing inner sleeve or a horizontal strip-shaped hole opened circumferentially from the middle of the anti-mixing inner sleeve.

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