Spiral diffusion air distribution device for waste heat regeneration drying machine

Abstract

The spiral diffusion air distribution device comprises a first flow divider and a second flow divider, the first flow divider comprises an air inlet barrel, first circular air holes are densely formed in the upper top face of the air inlet barrel, a first divergent nozzle is arranged in the middle section of the side wall of the air inlet barrel, and a second divergent nozzle is arranged in the middle section of the side wall of the air inlet barrel. A plurality of first positioning openings are formed in the lower section of the side wall of the air inlet barrel; the second flow divider comprises a spiral air distribution pipe and an annular air distribution pipe, and a plurality of second positioning openings are formed in the bottom end of the annular air distribution pipe; a rotary flow guide plate is welded and fixed between the annular air distribution pipe and the upper section of the air inlet barrel, second circular air holes are formed in the upper surface of the inner side wall of the annular air distribution pipe, and a spiral air distribution pipe is arranged between the first positioning opening and the second positioning opening; compressed air entering the adsorption tower can be uniformly dispersed to the periphery of the wall of the adsorption tower so as to increase the contact area with an adsorbent.

Description

Technical Field

[0001] The invention relates to a spiral diffusion air distribution device for a waste heat regeneration dryer, belonging to the technical field of dryers. Background Art

[0002] Adsorption dryers use the moisture absorption properties of adsorbents (activated alumina, silica gel, molecular sieves) to reduce the moisture content in compressed air.

[0003] Adsorption dryer is a device that uses the moisture adsorption property of adsorbent (activated alumina) to reduce the water content in compressed air. When in use, saturated wet air enters the air inlet of the adsorption tower of the dryer, passes through the adsorption filler to remove moisture, and is then discharged from the outlet. If the inlet air flow is unevenly distributed, it will directly affect the dew point of the finished gas and the service life of the equipment.

[0004] However, most of the adsorption towers of the current dryers are "single-point" inlet and outlet, which causes the air flow to gather in the center of the adsorption filler, which is prone to gas channeling and reduces the air flow diffusion range. Often, the water absorption of the middle desiccant reaches saturation, and the desiccant at the edge still has great potential. The adsorbent cannot be fully utilized, which not only causes waste of adsorbent, but also makes the adsorption effect of the adsorbent on compressed air moisture further improved. In addition, since the inlet and outlet pipes of the dryer are relatively small, the flow rate of compressed gas increases instantly when entering the tower body, and the dry adsorption filler has limited pressure resistance. Under severe impact, it will be destroyed to form fragments or even powder, resulting in the adsorption of The adsorption performance decreases rapidly. As the powder increases, it will also clog the downstream equipment, causing malfunctions of user-side equipment and instruments, seriously affecting the stable operation of production. At the same time, the compressed air that moves in a straight line in the cavity of the adsorption tube is prone to incomplete adsorption treatment due to its short path. In order to allow the compressed air and the adsorption filler to have sufficient contact time, it is necessary to reduce the angle at which the airflow enters the adsorption filler. The solution to the above problem is to weld a spiral diffuser in the air inlet pipe so that the compressed air entering the adsorption tower is evenly dispersed to the four sides of the adsorption tower wall by the diffuser impeller, thereby increasing the contact area with the adsorbent. However, the effect is not very good and the airflow is still very uneven.

[0005] Therefore, it is necessary to develop a spiral diffusion air distribution device for a waste heat regeneration dryer. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a spiral diffusion air distribution device for a waste heat regeneration dryer, which can evenly disperse the compressed air entering the adsorption tower around the adsorption tower wall to increase the contact area with the adsorbent.

[0007] The technical solution of the present invention is as follows:

[0008] A spiral diffusion air distribution device for a waste heat regeneration dryer comprises a first diverter and a second diverter, the first diverter comprises an air inlet cylinder, the upper top surface of the air inlet cylinder is densely covered with first circular air holes, the middle section of the side wall of the air inlet cylinder is provided with a first gradually diverging nozzle, and the lower section of the side wall of the air inlet cylinder is provided with a plurality of first positioning openings; the second diverter comprises a spiral air distribution duct and an annular air distribution duct, and the bottom end of the annular air distribution duct is provided with a plurality of second positioning openings; a rotating guide plate is welded and fixed between the annular air distribution duct and the upper section of the air inlet cylinder, second circular air holes are provided on the upper surface of the inner wall of the annular air distribution duct, and a spiral air distribution duct is provided between the first positioning opening and the second positioning opening.

[0009] Wherein, a second gradually diverging nozzle is arranged on the lower surface of the spiral air distribution duct.

[0010] The first circular pores are arranged in a Fermat spiral shape, and the apertures of the first circular pores and the second circular pores are smaller than the minimum particle size of the alumina particle adsorbent.

[0011] Wherein, the first gradually diverging nozzle and the second gradually diverging nozzle are both arranged obliquely, and the airflow can be sprayed upward along the nozzle at 45 degrees through the first gradually diverging nozzle and the second gradually diverging nozzle.

[0012] Among them, the center height of the first positioning opening is one-sixth of the height of the side wall of the air inlet cylinder, and the width between the centers of adjacent first positioning openings is one-fifth of the circumference of the air inlet cylinder; the width between the centers of adjacent second positioning openings is one-fifth of the circumference of the annular air distribution duct.

[0013] The pitch angle of the blades of the rotating guide plate is set to 20 degrees, the blades of the rotating guide plate are set to be gradually expanding, and the chord length of the leading edge of the blades of the rotating guide plate is twice the chord length of the root edge of the blades.

[0014] The distribution area of ​​the second circular air holes is close to the top of the annular surface of the annular air distribution pipe, and the distribution area is one quarter of the arc length of the inner wall of the annular air distribution pipe.

[0015] Among them, a flow limiting device is also arranged at the bottom of the air inlet cylinder, and the flow limiting device includes a chassis and a driving ring. The driving ring is rotatably arranged on the top of the chassis, and a wind tunnel is arranged at the center of the chassis. A plurality of swing arm connecting rods are rotatably arranged on the surface of the driving ring, and a triangular turntable is rotatably arranged at the bottom of the other end of the swing arm connecting rod, and one end of the triangular turntable is rotatably arranged on the chassis and close to the wind tunnel of the chassis, and a plurality of the triangular turntables are spliced ​​to form a circle through the driving of the swing arm connecting rod; a plurality of insertion holes are arranged in a circular array on the chassis, and a fixing hole matching the insertion hole is arranged on the surface of the driving ring, and the chassis and the driving ring are fixed by inserting a pin between the fixing hole and the insertion hole.

[0016] Wherein, the diameter of the chassis is larger than the diameter of the driving ring, and the chassis and the driving ring are arranged concentrically.

[0017] Wherein, the bottom of the air inlet cylinder is fixedly arranged on the chassis, and the air inlet cylinder is arranged on a side away from the driving ring.

[0018] The present invention has the following beneficial effects:

[0019] The present invention improves the original air inlet. This device not only adds an exhaust port to make the compressed air diffuse more evenly, but also changes the single gas flow mode of the original air inlet, increases the rotating airflow, optimizes the gas flow state, and at the same time, the spiral guide plate shares part of the pressure of the compressed air directly acting on the adsorption filler, reduces the scouring and wear of the adsorption medium, reduces the generation of aluminum oxide particle powder, and greatly prolongs the service life of the filter element;

[0020] The surface of the spiral air distribution duct of the present invention is provided with a plurality of special-shaped air holes arranged upward in the spiral direction. The compressed air flowing through the duct is discharged into the adsorption space in a directional manner to form a spiral airflow, and enters the adsorption filler at a smaller angle, thereby increasing the airflow flow area, reducing the airflow velocity, and allowing the airflow to contact the adsorbent more fully, making the adsorption and desorption processes more complete, which is beneficial to improving the working efficiency of the adsorbent.

[0021] The present invention also provides a flow limiting device, which is used to adjust the speed of the airflow entering the tower body to avoid the problem that the adsorption filler is destroyed to form fragments or even powder due to excessive flow rate when the gas enters the tower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the first splitter and the second splitter of the present invention;

[0023] Figure 2 A top view of the first flow splitter and the second flow splitter of the present invention;

[0024] Figure 3 It is a side view of the first flow splitter and the second flow splitter of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the drive ring of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the swing arm connecting rod and the triangular turntable of the present invention;

[0027] Figure 6 It is an overall schematic diagram of the current limiting device of the present invention;

[0028] Figure 7 It is a top view of the chassis of the present invention.

[0029] The reference numerals in the figure represent:

[0030] 1. Air inlet tube; 2. First circular air hole; 3. First gradually diverging nozzle; 4. Spiral air distribution duct; 5. Annular air distribution duct; 6. Rotating guide plate; 7. First positioning port; 8. Second positioning port; 9. Leading edge of blade; 41. Second gradually diverging nozzle; 51. Second circular air hole; 91. Root edge of blade; 10. Chassis; 11. Drive ring; 12. Wind tunnel; 13. Swing arm connecting rod; 14. Triangular turntable; 15. Insertion hole; 16. Fixing hole. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] See also Figures 1 to 7 , the invention provides a technical solution:

[0033] A spiral diffuser air distribution device for a waste heat regeneration dryer, comprising a first flow divider and a second flow divider;

[0034] The first flow divider part includes an air inlet cylinder 1, and the upper top surface of the air inlet cylinder 1 is densely covered with first circular air holes 2, which are arranged in the shape of a Fermat spiral. Compared with the ordinary periodic array, the filling density is higher, so that the airflow is divided into more uniform streams. At the same time, the aperture of the first circular air hole 2 is smaller than the minimum particle size of the alumina particle adsorbent, ensuring that the alumina particle adsorbent is effectively blocked and filtered;

[0035] A first gradually expanding nozzle 3 is provided in the middle section of the side wall of the air inlet tube 1, so that the airflow is ejected upward at 45 degrees along the nozzle, effectively avoiding the formation of airflow dead angles and improving the diffusion efficiency of the airflow;

[0036] A first positioning opening 7 is provided at the lower section of the side wall of the air inlet cylinder 1 . The center height of the first positioning opening 7 is one sixth of the height of the side wall of the air inlet cylinder 1 , and the width between adjacent centers is one fifth of the circumference of the air inlet cylinder 1 .

[0037] The second flow divider includes a spiral air distribution pipe 4 and an annular air distribution pipe 5. The bottom end of the annular air distribution pipe 5 is provided with a second positioning opening 8. The width between adjacent centers of the second positioning openings 8 is one fifth of the circumference of the annular air distribution pipe 5.

[0038] A rotating guide plate 6 is welded and fixed between the annular air distribution duct 5 and the upper section of the air inlet cylinder 1. The pitch angle of the blades of the rotating guide plate 6 is set to 20 degrees. A second circular air hole 51 is opened on the upper surface of the inner wall of the annular air distribution duct 5. The distribution area of ​​the second circular air hole 51 is close to the top of the annular surface, and the distribution area is one quarter of the arc length of the inner wall of the annular air distribution duct 5. When the airflow is ejected from the side wall of the air inlet cylinder 1, the rotating guide plate 6 first decelerates the compressed air, and then makes the compressed air flow out in a cyclone manner. A part of the compressed air collides with the air passing through the second circular air hole 51 to form fine turbulence and diffuse to the surroundings, thereby greatly reducing the impact damage of the compressed air to the filter and the adsorbent. The blades of each rotating guide plate 6 are set to be gradually expanding. The chord length of the leading edge 9 of the blade is twice the chord length of the root edge 91 of the blade. Therefore, the compressed air passing through the rotating guide plate 6 not only flows out in a cyclone manner, but also increases the contact area with the adsorption medium, thereby improving the adsorption efficiency.

[0039] In order to further promote the uniform distribution of airflow in the outer wall area of ​​the adsorption tower, a number of second gradually divergent nozzles 41 are arranged along the outer surface of the spiral air distribution duct 4, and the distribution area is one quarter of the arc length of the inner wall of the annular air distribution duct 5. Due to the inertia generated when the airflow makes centrifugal motion in the spiral air distribution duct 4, the rotating airflow generated by the spiral air distribution duct 4 is prevented from being blocked by the lateral airflow during the whole process. Therefore, there is no need to distribute the second circular air holes 51 on the horizontal plane of the outer wall of the annular air distribution duct 5.

[0040] A flow limiting device is also provided at the bottom of the air inlet 1, and the flow limiting device includes a chassis 10 and a driving ring 11, the driving ring 11 is rotatably provided on the top of the chassis 10, a wind tunnel 12 is provided at the center of the chassis 10, a plurality of swing arm connecting rods 13 are rotatably provided on the surface of the driving ring 11, a triangular turntable 14 is rotatably provided at the bottom of the other end of the swing arm connecting rod 13, one end of the triangular turntable 14 is rotatably provided on the chassis 10 and close to the wind tunnel 12 of the chassis 10, and a plurality of triangular turntables 14 are connected to the wind tunnel 12 of the chassis 10 by the swing arm connecting rod 13. The driving splicing forms a circle; a plurality of insertion holes 15 are arranged in a circular array on the chassis 10, and fixing holes 16 matching the insertion holes 15 are arranged on the surface of the driving ring 11. The chassis 10 and the driving ring 11 are fixed by inserting a pin between the fixing hole 16 and the insertion hole 15; the diameter of the chassis 10 is larger than the diameter of the driving ring 11, and the chassis 10 and the driving ring 11 are arranged concentrically; the bottom of the air inlet cylinder 1 is fixed to the chassis 10, and the air inlet cylinder 1 is arranged on the side away from the driving ring 11.

[0041] Specifically, after the bottom of the air inlet tube 1 is fixed to the chassis 10, the driving ring 11 is rotated. Since a plurality of swing arm connecting rods 13 are rotatably arranged on the surface of the driving ring 11, and at the same time, one end of the triangular turntable 14 is rotatably arranged on the chassis 10 and close to the wind tunnel 12 of the chassis 10, the plurality of triangular turntables 14 will move toward the center of the circle or disperse under the drive of the rotation of the driving ring 11. It is worth mentioning that when the other ends of the plurality of triangular turntables 14 are gathered at the center of the circle, the plurality of triangular turntables 14 are spliced ​​to form a circle and the wind tunnel 12 is blocked, that is, the remaining gap between the plurality of triangular turntables 14 is the air inlet; therefore, when it is necessary to adjust the wind speed by adjusting the size of the air inlet, it is only necessary to rotate the driving ring 11 to drive the plurality of triangular turntables 14 to move to a certain gap, so that the airflow can be ejected from the gap of suitable size, and then the fixing hole 16 and the insertion hole 15 are inserted through the pin to fix the chassis 10 and the driving ring 11.

[0042] The working principle of the spiral diffuser air distribution device for the waste heat regeneration dryer is as follows:

[0043] When using the adjustable piston-type screen plate device for a waste heat regeneration dryer of this embodiment, the specific steps are as follows:

[0044] First, after the current limiting device is opened to a certain required gap size, the outer ring position of the driving ring 11 on the chassis 10 is installed at the position of the bottom head of the adsorption tower;

[0045] Then, during operation, the compressed air entering the device through the air intake pipe is diverted by the air intake tube 1, and a part of the air flow is diffused to the central area of ​​the adsorption tower through the first circular air hole 2 at the top of the air intake tube 1, and a part of the air flow is ejected under pressure from the first gradually expanding nozzle 3 and decelerated after passing through the rotating guide plate 6, and then spirally rises into the adsorption tower and collides with the exhaust gas from the second circular air hole 51 on the inner wall surface of the annular air distribution pipe 5, forming fine turbulence that diffuses around. At the same time, the air flow passing through the spiral air distribution pipe 4 is accelerated and ejected under pressure from the second gradually expanding nozzle 41, and forms a swirling rise on the inner wall of the adsorption tower.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spiral diffuser for a waste heat regeneration dryer, characterized in that: It comprises a first flow splitter and a second flow splitter, wherein the first flow splitter comprises an air inlet cylinder (1), the upper top surface of the air inlet cylinder (1) is densely covered with first circular air holes (2), the middle section of the side wall of the air inlet cylinder (1) is provided with a first gradually diverging nozzle (3), and the lower section of the side wall of the air inlet cylinder (1) is provided with a plurality of first positioning openings (7); the second flow splitter comprises a spiral air distribution pipe (4) and an annular air distribution pipe (5), the bottom end of the annular air distribution pipe (5) is provided with a plurality of second positioning openings (8); a rotating guide plate (6) is welded and fixed between the annular air distribution pipe (5) and the upper section of the air inlet cylinder (1), the upper surface of the inner side wall of the annular air distribution pipe (5) is provided with second circular air holes (51), and a spiral air distribution pipe (4) is provided between the first positioning opening (7) and the second positioning opening (8).

2. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: A second gradually diverging nozzle (41) is provided on the lower surface of the spiral air distribution duct (4).

3. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: The first circular pores (2) are arranged in a Fermat spiral shape, and the apertures of the first circular pores (2) and the second circular pores (51) are smaller than the minimum particle size of the alumina particle adsorbent.

4. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: The first gradually diverging nozzle (3) and the second gradually diverging nozzle (41) are both arranged at an inclination, and the first gradually diverging nozzle (3) and the second gradually diverging nozzle (41) can cause the airflow to be ejected upward along the nozzle at an angle of 45 degrees.

5. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: The center height of the first positioning opening (7) is one sixth of the height of the side wall of the air inlet duct (1), and the width between the centers of adjacent first positioning openings (7) is one fifth of the circumference of the air inlet duct (1); the width between the centers of adjacent second positioning openings (8) is one fifth of the circumference of the annular air distribution duct (5).

6. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: The pitch angle of the blades of the rotating guide plate (6) is set to 20 degrees, the blades of the rotating guide plate (6) are set to be gradually expanding, and the chord length of the blade leading edge (9) of the rotating guide plate (6) is twice the chord length of the blade root edge (91).

7. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: The distribution area of ​​the second circular air holes (51) is close to the top of the annular surface of the annular air distribution pipe (5), and the distribution area is one quarter of the arc length of the inner wall of the annular air distribution pipe (5).

8. The spiral air diffusion device for a waste heat regeneration dryer according to claim 1, characterized in that: A flow limiting device is also provided at the bottom of the air inlet cylinder (1), and the flow limiting device comprises a chassis (10) and a driving ring (11), the driving ring (11) is rotatably provided on the top of the chassis (10), a wind tunnel (12) is provided at the center of the chassis (10), a plurality of swing arm connecting rods (13) are rotatably provided on the surface of the driving ring (11), a triangular rotating disk (14) is rotatably provided at the bottom of the other end of the swing arm connecting rod (13), and one end of the triangular rotating disk (14) is rotatably provided on the bottom of the chassis (10). A plurality of triangular turntables (14) are connected to form a circle by driving a swing arm connecting rod (13) on a chassis (10) and close to a wind tunnel (12) of the chassis (10); a plurality of insertion holes (15) are arranged in a circular array on the chassis (10); a fixing hole (16) matching the insertion hole (15) is arranged on the surface of the driving ring (11); and the chassis (10) and the driving ring (11) are fixed by inserting a pin between the fixing hole (16) and the insertion hole (15).

9. The spiral air diffusion device for a waste heat regeneration dryer according to claim 8, characterized in that: The diameter of the chassis (10) is greater than the diameter of the drive ring (11), and the chassis (10) and the drive ring (11) are arranged cocentrically.

10. The spiral air diffusion device for a waste heat regeneration dryer according to claim 9, characterized in that: The bottom of the air inlet cylinder (1) is fixedly arranged on the chassis (10), and the air inlet cylinder (1) is arranged on a side away from the driving ring (11).

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