Double-sleeve fine-selection cyclone separation equipment

Abstract

The invention discloses double-sleeve fine-selection cyclone separation equipment which comprises a spiral air inlet pipe (1), an air inlet (2), a cone (3), an ash hopper (4), an air outlet (5), an overflow cylinder (7), an inner cylinder (8) and an upturning cylinder (9), a double-layer sleeve structure and an auxiliary outlet airflow adjusting mechanism are arranged, and opening degrees of a top bypass pipe and a drainage fan are combined to adjust air distribution, guide a spiral airflow lengthening path in equipment, balance and make up working conditions of an airflow return area, control pressure drop change in the equipment, prolong and stabilize a cyclone separation process, realize cyclone multi-link continuous separation and improve the separation efficiency. A rotational flow cover-synchronous impeller connecting shaft mechanism arranged on rotational flow turn-back fulcrums at the lower ends of the inner cylinder and the outer cylinder can automatically clean local accumulated dust, greatly inhibit backmixing, reduce longitudinal circulation of an annular space, regulate or overcome short-circuit flow at a lower opening of an exhaust pipe, maintain stable and coaxial inner and outer rotational flow centers and the geometric center of equipment, and improve the air exhaust efficiency. Secondary vortex is effectively avoided or eliminated, and the separation efficiency of micron and submicron dust can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of centrifugal devices or centrifuges and equipment using free swirl for realizing physical or chemical process in IPC classification B04C9 / 00, and in particular to an improved cyclone separation equipment with inner and outer double-layer cylinder structure. Background Art

[0002] Cyclone separation equipment is an industrially widely used equipment for separation of gas-solid systems or liquid-solid systems. The working principle is to rely on the rotational motion caused by the tangential introduction of airflow to throw solid particles or liquid droplets with large inertial centrifugal force to the outer wall to separate. Since the centrifugal force on the particles is much greater than the gravity and inertial force, the solid particles in the airflow are separated, and the centrifugal force of the airflow is used to throw the particles to the wall to achieve separation. The flow rate and pressure of the working airflow inside the equipment are changed, so that the airflow carries solid particles into the equipment body. After the solid particles in the airflow are settled, the gas is extracted from the separator through the upper negative pressure system, thereby achieving the effect of separating the solid particles in the airflow.

[0003] Traditional and general cyclone separation equipment is mostly single-layer structure. When the gas reaches the outlet after centrifugation, it is easy to remix with some dust and be discharged. In the application process, cyclone separation equipment is constantly developing and improving. Among them:

[0004] Chinese invention patent application CN201810390818.7 discloses a double-layer cyclone separator, which includes an outer shell with an air inlet, an air outlet and an oil outlet, and an inner shell, which is coaxially arranged with the outer shell and forms a first separation chamber between the inner shell and the outer shell; the inner shell surrounds a second separation chamber; the air inlet is connected to the first separation chamber and the second separation chamber respectively.

[0005] Chinese invention patent application CN201210420665.9 discloses a cyclone separator, including a vacuum component; an inner cylinder and an outer cylinder arranged outside the inner cylinder, a closed vacuum cavity is formed between the inner cylinder and the outer cylinder, and the upper size of the inner cavity of the inner cylinder is larger than the lower size; an inlet component, connected to the upper part of the inner cavity of the inner cylinder, used to input the coal gas to be separated into the inner cavity; an air outlet component, connected to the top or upper part of the inner cavity of the inner cylinder, used to output the separated coal gas; an ash discharge component, connected to the lower part of the inner cavity of the inner cylinder, used to discharge the separated coal ash.

[0006] Chinese patent application 202010441437.4 discloses a double-layer shell type high-efficiency cyclone separator, comprising a cyclone volute inlet (1), a cyclone outlet (2), a top plate (3), a cylinder assembly (4), an outer shell (5), an inner cone assembly (6), an outer intermediate ash hopper (7), an inner intermediate ash hopper (8) and a vortex stabilizing double cone (9); the cyclone volute inlet is tangentially connected to the upper cylinder tower section; a vertical guide vane is arranged in the interface guide; the outer shell is connected to the upper cylinder tower section and the outer intermediate ash hopper, the inner cone assembly is arranged in the outer shell, and a first annular gap is formed between the outer shell, the inner cone assembly and the cylinder assembly; the inner intermediate ash hopper is arranged in the outer intermediate ash hopper and a second annular gap is formed between the two, and the first annular gap is connected to the second annular gap to form an annular sedimentation space.

[0007] Chinese patent application 202323663448.5 provides a double-layer filtering cyclone separator, including a separator body, the separator body is provided with an air inlet and an air exhaust port, and a filter channel is formed between the air inlet and the air exhaust port; the cyclone separator also includes a filter assembly, the filter assembly is arranged in the filter channel, and is used to filter the gas in the separator body; the filter assembly includes a first filter element and a second filter element, the second filter element is arranged around the filter channel, the first filter element is located between the separator body and the second filter element, and the first filter element is covered with the second filter element in at least one direction in the circumferential and radial directions of the separator body, so that the gas in the separator body passes through the first filter element and then passes through the second filter element.

[0008] Chinese patent application 202322716772.2 discloses an anti-back-mixing double-layer cone high-efficiency cyclone separator, which relates to the technical field of cyclone separators. The cyclone separator comprises a vertical tank body, a funnel tank body is arranged at the bottom of the vertical tank body, an air outlet extending to the inside of the vertical tank body is arranged at the top of the vertical tank body, an air inlet extending to the inside of the vertical tank body is arranged on the outer surface of the vertical tank body, and an anti-mixing separation unit is arranged inside the vertical tank body. The anti-mixing separation unit can rotate and centrifuge the wind cut into the air inlet to separate the dust in the gas, and can also isolate the air outlet channel through the anti-mixing bucket to prevent the separated dust from being mixed and brought back through the air outlet, and can also filter the dust in the gas to avoid the occurrence of unclean separation. Secondly, the filter screen can be cleaned in real time by the scraping baffle, thereby improving the practicability of the device.

[0009] Chinese patent application 202410325728.5 provides a double-layer cyclone separator, including a separation barrel, a partition is arranged in the separation barrel, the side walls of the partition are connected to the inner wall of the separation barrel through circumferentially arranged connecting blocks, and the interior of the separation barrel is divided into a first separation layer and a second separation layer from top to bottom; a first rotatably mounted first cyclone rod is arranged in the first separation layer, and a feed pipe and a first discharge pipe are located above the first cyclone rod and connected to the outside world; a second cyclone rod is arranged in the second separation layer, and a second discharge pipe is located above the second cyclone rod and connected to the outside world; the material will first enter the first separation layer, and the first separation will be performed by the rotation of the first cyclone rod, and then the material will enter the second separation layer, and the rotation speed of the second cyclone rod is lower than that of the first cyclone rod, so the material can be separated for the second time by the rotation of the second cyclone rod.

[0010] However, the existing single-layer or double-layer cyclone separators have the problem that the negative pressure at the airflow outlet is difficult to control, the working airflow and the internal air pressure are unstable, and when the airflow carries solid particles, on the one hand, the inner wall structure of the separator is damaged due to excessive impact force, or on the other hand, the airflow is too small and the separation effect is poor. These constraints lead to reduced gas separation efficiency, affecting the overall work efficiency, and also causing the separator to need frequent maintenance and replacement, which brings great inconvenience to production. Summary of the invention

[0011] The present invention proposes a double-sleeve concentrating cyclone separation device, which overcomes the defect of internal damage of the equipment in the above prior art, controls the internal pressure drop of the equipment by setting a double-layer sleeve structure and an auxiliary outlet airflow adjustment mechanism, and aims to improve the existing technical problems.

[0012] To this end, the present invention includes: a spiral air inlet pipe, an air inlet, a cone, an ash hopper, an air outlet, an overflow tube, an inner tube and an upturned tube. The air inlet is tangentially installed on one side of the outer wall at the top of the spiral air inlet pipe, and the bottom of the spiral air inlet pipe is connected to the cone; the bottom of the cone is connected to the ash hopper, and the air outlet is installed in the middle of the upper end of the spiral air inlet pipe. The overflow tube is connected and installed at the top of the spiral air inlet pipe, i.e., the lower side of the air outlet, and the lower end of the overflow tube is connected to the upturned tube through the inner tube. A swirl cover is arranged in the lower part of the cone, i.e., the lower side of the lower port of the upturned tube. At the same time, a synchronous impeller is arranged in the lower port of the upturned tube, and the swirl cover and the synchronous impeller are coaxially connected through a connecting rod. By setting a double-layer sleeve structure and an auxiliary outlet airflow adjustment mechanism, combined with the top bypass pipe and the induced draft fan opening adjustment gas distribution, the spiral airflow in the equipment is guided to lengthen the path, the internal pressure drop of the equipment is controlled, the cyclone separation process is extended and stabilized, and the swirl multi-link continuous separation is realized. The air inlet and the air outlet have the same inner diameter.

[0013] The overflow tube passes through the top plate and is connected from a local top opening on one side and inserted into the air outlet. At the same time, the overflow tube passes through the top plate and is connected to the top bypass pipe at the local top opening on the other side and is connected back to the top edge of the spiral air inlet pipe on the same side. An air outlet regulating valve is installed on the air outlet. The air outlet is externally connected to a drainage fan. Furthermore, an air distribution maintenance valve is installed on the top bypass pipe.

[0014] The blades of the swirl cover or the synchronous impeller are unclosed Mobius blades, and the front and rear ends of the blades are tilted in the same direction.

[0015] Furthermore, to achieve the above object, the present invention is configured as follows:

[0016] In particular, the spiral air inlet pipe is vertically coaxially arranged with the overflow cylinder, the inner cylinder and the upward-turned cylinder.

[0017] In particular, the inner diameters of the overflow tube, the inner tube and the upward tube decrease in sequence. In particular, the inner diameter of the overflow tube is 50-75% of the inner diameter of the spiral air inlet pipe, and the inner diameter of the upward tube is 85-150% of the inner diameter of the cone bottom port or the ash hopper.

[0018] In particular, the lower port of the upturned cylinder is located at the midpoint of the central axis of the cone.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By setting up a suspended inner cylinder structure, planning the outer swirl-inner swirl return airflow path, extending and stabilizing the cyclone separation process, and setting up a swirl cover-synchronous impeller coupling mechanism on the swirl return fulcrum at the lower end of the inner and outer cylinders, it can not only stabilize the spiral airflow, but also use the outer swirl annular sedimentation space and the inner swirl decompression rising space to separate the solid particles in the airflow step by step online, greatly suppress the generation of back mixing, and realize the swirl multi-link continuous separation. At the same time, it is more effective to prevent blockage and prevent dust accumulation; combined with the top bypass pipe and the opening adjustment of the drainage fan, the structure is improved in a simple way, and the functions of adjustable pressure drop, control of swirl density, and equipment airflow cleaning and maintenance are significantly enhanced during operation, enriching the equipment control means, preventing the separated dust from being mixed and carried out through the air outlet, and improving the separation efficiency of the cyclone tube. It can greatly improve the separation efficiency of micron and submicron dust. The separation efficiency for particles larger than 3 microns can reach 99.9%, and the separation efficiency for particles smaller than 3 microns can also reach 98%. It is suitable for the separation of different materials. The separation efficiency is increased by 2.5-4.3%, while the resistance is reduced by 6.3-11.5%, which can make the material separation more delicate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0022] Figure 1 This is a structural diagram of Example 1 of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of a swirl cover or a synchronous impeller in Example 1 of the present invention.

[0024] Reference numerals include:

[0025] 1- spiral air inlet pipe, 2- air inlet, 3- cone, 4- ash hopper, 5- air outlet, 6- air outlet regulating valve, 7- overflow cylinder, 8- inner cylinder, 9- upturned cylinder, 10- lower bracket, 11- swirl cover, 12- connecting rod, 13- synchronous impeller, 14- upper bracket, 15- top bypass pipe, 16- air distribution maintenance valve, 17- drainage fan. DETAILED DESCRIPTION

[0026] It should be noted that the terms "including" and "having" and any of their variations are intended to cover other possible choices under the same logic that are not listed. For example, a process, method, system, product or device containing a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the invention product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. The terms "set", "install", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. In the event of a conflict, the definitions in this specification shall prevail.

[0028] The cyclone separator has the advantages of simple structure, no excessive moving parts, high separation efficiency, easy maintenance, and long-term stable operation under harsh working conditions such as high temperature and high pressure. However, the internal movement of the cyclone separator is extremely complex, belonging to two-phase or three-phase three-dimensional turbulent flow, which makes its theoretical research very difficult, and its accurate movement law cannot be fully grasped so far. Despite this, research on cyclone separators continues to be carried out at home and abroad, and research methods and means keep pace with the development of science and technology.

[0029] Separation effect of cyclone separator: Under the conditions of designed pressure and gas volume, solid particles ≥10μm can be removed. At the operating point, the separation efficiency is 99%, and within the range of ±15% of the operating point, the separation efficiency is 97%. Under normal working conditions, the pressure drop of a single cyclone separator at the operating point is not more than 0.05MPa.

[0030] Methods to improve efficiency: In the rotating airflow inside the cyclone dust collector, the particles are acted upon by centrifugal force and move radially outward toward the cone wall. The movement speed can be calculated from the motion equation of the centrifugal force on the particles and the airflow resistance. Obviously, the purpose of separation in the cyclone dust collector is to make the particles reach the cone wall as quickly as possible. Therefore, extending the movement time of the particles in the cyclone dust collector and increasing the probability of the particles colliding with the cone wall under the action of the airflow can improve the dust removal efficiency of the cyclone dust collector.

[0031] During the operation of the cyclone dust collector, most of the fine dust penetrates the separation area, resulting in a decrease in the efficiency of fine dust. At the same time, the cyclone dust collector is less efficient for fine particles, especially for particles with a dust diameter of less than 10μm, namely PM10. The dust removal efficiency gradually decreases as the particle diameter decreases. The airflow velocity distribution of the cyclone dust collector is axially asymmetric or eccentric in the radial direction. Especially near the lower part of the cone near the dust outlet, there is an obvious "eccentricity"; near the lower end of the exhaust pipe, the radial airflow velocity is relatively large, and there is a "short circuit" phenomenon. Eccentric or short-circuited airflow is not conducive to dust separation.

[0032] Based on this, it is necessary to study and find ways to improve the cyclone performance by adding additional components without changing the original cyclone dust collector main structure. For example, a cyclone dust collector with a secondary separation accessory can be installed.

[0033] The principle of the present invention is that the movement of gas and solid particles in the cyclone separator is very complex. There are tangential, radial and axial velocities at any point in the cyclone, and they vary with the rotation radius. In actual operation, the appropriate gas velocity should be controlled. Experiments show that if the gas velocity is too low, the separation efficiency is not high. However, if the gas velocity is too high, eddy currents and back-mixing are likely to occur, which will also reduce the separation efficiency.

[0034] In the present invention, the rotational motion caused by the tangential introduction of the airflow causes the solid particles or liquid droplets with large inertial centrifugal force to be thrown to the outer wall and separated. The flow inside the cyclone separator is a complex three-dimensional strong vortex flow, which is accompanied by local secondary flows such as longitudinal circulation, short-circuit flow, and back-mixing in addition to the mainstream vortex; the local secondary flow is one of the important factors affecting the separation efficiency of the cyclone separator, and the "back-mixing" problem is the difficulty in the local secondary flow.

[0035] According to current research theories, in addition to the main vortex including the inner vortex and the outer vortex, secondary vortex is common inside the cyclone separator. It is composed of axial velocity vz and radial velocity vr. Secondary vortex will cause serious "remixing" of solid particles inside the separator. Secondary vortex has a great influence on the performance of cyclone separator, especially on the separation efficiency. The main local secondary vortices are: 1) longitudinal circulation in the annular space; 2) short-circuit flow at the lower end of the exhaust pipe; 3) the center of airflow rotation deviates from the geometric center of the equipment, that is, bias flow or asymmetric flow; 4) the inner vortex is unstable, and there is a "tail swinging" motion in the center of the vortex, that is, the phenomenon of vortex core. It can be seen that eliminating secondary vortex and reducing the "remixing" of solid particles are important contents to improve the separation efficiency of cyclones.

[0036] The present invention is based on systematic research and experimental work, and it is found that an inner sleeve is added inside the cyclone separator to simply guide the spiral airflow inside the equipment and clearly lengthen the swirl path and channel. At the same time, in order to balance and compensate for the adverse effects of the added inner cylinder structure on the original structure, such as possible dust accumulation in the local structure of the airflow reversal area and possible increase in the overall flow channel pressure drop, a synchronous impeller, a top bypass pipe and a drainage fan are additionally provided to reduce the longitudinal circulation in the annular space, regulate or overcome the short-circuit flow at the lower end of the exhaust pipe, maintain the internal and external swirl centers stably coaxial with the geometric center of the equipment, effectively avoid or eliminate secondary vortexes, and reduce the "back mixing" of solid particles.

[0037] The present invention comprises: a spiral air inlet pipe 1, an air inlet 2, a cone 3, an ash hopper 4, an air outlet 5, an overflow tube 7, an inner tube 8 and an upward turning tube 9. The air inlet 2 is tangentially installed on one side of the outer wall of the top of the spiral air inlet pipe 1, and the bottom of the spiral air inlet pipe 1 is connected to the cone 3; the bottom of the cone 3 is connected to the ash hopper 4, the air outlet 5 is installed in the middle of the upper end of the spiral air inlet pipe 1, and the overflow tube 7 is connected and installed at the top of the spiral air inlet pipe 1, that is, the lower side of the air outlet 5, and the lower end of the overflow tube 7 is connected to the upward turning tube 9 through the inner tube 8.

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] The content of the present invention can be more easily understood by selecting the following preferred implementation methods of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0040] Embodiment 1: As attached Figure 1 As shown, a swirl cover 11 is arranged at the lower part of the cone 3, i.e., at the lower side of the lower port of the upper inverted cylinder 9. At the same time, a synchronous impeller 13 is arranged in the lower port of the upper inverted cylinder 9. The swirl cover 11 and the synchronous impeller 13 are coaxially connected through a connecting rod 12.

[0041] In the above, the upper bracket 14 is installed at the connection position between the bottom of the inner wall of the spiral air inlet pipe 1 and the cone 3. The upper bracket 14 is used to fix and straighten the inner cylinder 8 and the upturned cylinder 9. The lower end of the upturned cylinder 9 is rolled inward.

[0042] In the foregoing, a lower bracket 10 is installed on the inner wall of the lower middle portion of the cone 3. The lower bracket 10 is used to place and fix the swirl cover 11.

[0043] In the embodiment of the present invention, the overflow tube 7 passes through the top plate and is connected from a local top opening on one side to be inserted into the air outlet 5. At the same time, the overflow tube 7 passes through the top plate and is connected to the top bypass pipe 15 at the local top opening on the other side and is connected back to the top edge of the spiral air inlet pipe 1 on the same side. The air outlet regulating valve 6 is installed on the air outlet 5. The air outlet 5 is externally connected to the drainage fan 17. Furthermore, the air distribution maintenance valve 16 is installed on the top bypass pipe 15.

[0044] Preferably, as attached Figure 2 As shown, the blades of the swirl cover 11 or the synchronous impeller 13 are unclosed Mobius blades, and the front and rear ends of the blades are tilted in the same direction, which is not easy to accumulate dust. The power conversion efficiency of the forward and reverse airflow is high, and the static pressure air volume per unit time does not differ by more than 5% when the blades are in the forward and reverse states. The blades can not only rotate forward to dissipate heat, but also reverse to dissipate air, discharge foreign matter and dust, maintain the cleanliness of the air outlets on both sides of the fan, increase the air volume, and extend the service life. 2. The middle part of the blade is a circular arc section coaxial with the hub, so that the airflow outside the blade can smoothly transition along the middle arc surface, will not block the flow of air, reduce the generation of wind resistance, reduce the kinetic energy of the fan drive structure, increase the rotation speed, and increase the air volume.

[0045] In the embodiment of the present invention, the main structure of the equipment is a cylindrical cone type with a spiral air inlet pipe 1-cone 3; the axial blade is a Möbius ring structure with direct current-countercurrent balance; the air inlet 2 is a circular tube type or a rectangular tube type; preferably, the air inlet 2 is a volute structure. The operating conditions are that the air flow velocity of the air inlet 2 is 10-25m / s, and the pressure drop between the air inlet 2 and the air outlet 5 is not greater than 2Kpa. The ash hopper 4 adopts a large-size material leg structure to avoid gas blowby.

[0046] In the embodiment of the present invention, preferably, the cone angle of the cone 3 is in the range of 12-30°. The ratio of the height of the cone 3 to the height of the spiral air intake pipe 1 is 1.5-2.5.

[0047] In the embodiment of the present invention, the working airflow is introduced into the spiral air inlet pipe 1 from the air inlet 2 along the wall in a spiral downward tangential direction, and moves downward in a spiral along the channel between the inner wall of the spiral air inlet pipe 1 and the outer wall of the overflow cylinder 7-inner cylinder 8-upturn cylinder 9 to form an external vortex flow; when the descending working airflow reaches the bottom of the cone 3, the air pressure is increased due to the shrinking effect of the cone 3. At this time, the working airflow converges and turns upward from the lower port of the upturn cylinder 9 to enter the upturn cylinder 9. At this time, the direction of the airflow changes back and a certain pressure drop is also formed. For the first time, a large amount of dust escapes from the working gas and falls into the ash hopper 4. Next, the rising airflow entering from the lower port of the upper cylinder 9 expands step by step along the inner cylinder 8 to the overflow cylinder 7, and the air pressure drops further. But at the same time, because the air outlet 5 is arranged at the edge of one side of the top of the overflow cylinder 7 and plays a spiral drainage role, a spiral rising airflow is formed in the overflow cylinder 7, the inner cylinder 8 and the upper cylinder 9. It is worth noting that this measure solves the problem of weakening of the internal vortex when the inner cylinder is set in the prior art; the flow rate of the spiral rising airflow in the overflow cylinder 7, the inner cylinder 8 and the upper cylinder 9 is stable and easy to control, and the dust is continuously separated and falls into the ash hopper 4 from the lower port of the upper cylinder 9; as one of the innovations of the present invention, the vortex cover 11 arranged in the cone 3 rotates under the impetus of the working airflow, and further drives the synchronous impeller 13 located in the upper cylinder 9 to rotate through the connecting rod 12, so as to clean the dust trapped on the inner wall of the upper cylinder 9 in an energy-saving and environmentally friendly manner.

[0048] Furthermore, as an innovation of this embodiment, the gas distribution maintenance valve 16 is opened in two situations;

[0049] First, when it is necessary to clean and maintain the inside of the equipment, close the air outlet regulating valve 6, and replace the working air flow with clean air, which enters the spiral air inlet pipe 1 from the air inlet 2. At this time, the air distribution maintenance valve 16 is fully opened; part of the clean air enters the overflow tube 7 from the top through the top bypass pipe 15, and spirally descends, increasing the pressure stage by stage, overflowing the tube 7, sweeping the inner tube 8 and the inner wall of the upward tube 9. At the same time, the remaining clean air forms an external vortex to remove dust accumulated inside the equipment.

[0050] Secondly, when processing part of the working airflow carrying special dust, the air distribution maintenance valve 16 can be opened and adjusted at this time to distribute and offset the internal vortex working airflow in the overflow tube 7.

[0051] Based on the above embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention, so as to avoid exhaustively listing all implementation methods that are unnecessary and impossible to list comprehensively.

Claims

1. A double-sleeve fine cyclone separation device, comprising a spiral air inlet pipe (1), an air inlet (2), a cone (3), an ash hopper (4), an air outlet (5), an overflow tube (7), an inner tube (8) and an upwardly turned tube (9); characterized in that: An air inlet (2) is tangentially installed on one side of the outer wall of the top of the spiral air inlet pipe (1); the bottom of the spiral air inlet pipe (1) is connected to a cone (3); the bottom of the cone (3) is connected to an ash hopper (4); an air outlet (5) is installed in the middle of the upper end of the spiral air inlet pipe (1); an overflow tube (7) is installed at the top of the spiral air inlet pipe (1), i.e., below the air outlet (5); the lower end of the overflow tube (7) is connected to an upward turning tube (9) through an inner tube (8); in the lower part of the cone (3), i.e., the upward turning tube (9), A cyclone cover (11) is arranged at the lower side of the lower port, a synchronous impeller (13) is arranged in the lower port of the upper cylinder (9), and the cyclone cover (11) and the synchronous impeller (13) are coaxially connected via a connecting rod (12); by arranging a double-layer sleeve structure and an auxiliary outlet airflow adjustment mechanism, combined with a top bypass pipe and a draft fan opening adjustment air distribution, the spiral airflow in the device is guided to extend the path, the pressure drop inside the device is controlled, the cyclone separation process is prolonged and stabilized, and the cyclone multi-link continuous separation is realized.

2. The double-sleeve concentrating cyclone separation device according to claim 1 is characterized in that: The overflow tube (7) passes through the top plate and is connected from a local top opening on one side to be inserted into the air outlet (5). At the same time, the overflow tube (7) passes through the top plate and is connected to a top bypass pipe (15) through a local top opening on the other side and is connected back to the top edge of the spiral air inlet pipe (1) on the same side.

3. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The blades of the swirl cover (11) or the synchronous impeller (13) are unclosed Mobius blades, and the front and rear ends of the blades are tilted in the same direction.

4. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The spiral air inlet pipe (1) is vertically and coaxially arranged with the overflow cylinder (7), the inner cylinder (8) and the upward-turning cylinder (9).

5. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The inner diameters of the overflow cylinder (7), the inner cylinder (8) and the upward-turning cylinder (9) decrease in sequence.

6. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The lower port of the upward turning cylinder (9) is located at the midpoint of the central axis of the cone (3).

7. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The inner diameter of the overflow tube (7) is 50-75% of the inner diameter of the spiral air inlet pipe (1), and the inner diameter of the upward tube (9) is 85-150% of the inner diameter of the bottom port of the cone (3) or the ash hopper (4).

8. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: An air outlet regulating valve (6) is installed on the air outlet (5).

9. The double-sleeve concentrating cyclone separation device according to claim 1, characterized in that: The air outlet (5) is externally connected to a drainage fan (17).

10. The double-sleeve concentrating cyclone separation device according to claim 2, characterized in that: Install a gas distribution maintenance valve (16) on the top bypass pipe (15).

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