Cyclone separation device with secondary separation function and use method thereof

Abstract

The invention discloses a cyclone separation device with a secondary separation function and a use method of the cyclone separation device. The cyclone separation device comprises a device body, an inner cylinder, an air inlet formed in the device body, a first air outlet formed in the side face of the inner cylinder and a discharging port located in the lower end of the device body. The inner cylinder is conical, the upper end of the conical inner cylinder is a small end, the diameter of the small end is d1, the lower end of the conical inner cylinder is a large end, and the diameter of the large end is d2; the first air outlet is formed in the inner barrel far away from the air inlet in the airflow direction. According to the cyclone separation device with the secondary separation function, the inner barrel is provided with side air outlet, the air outlet mode of air is improved, and the system resistance is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of cyclones, and more particularly, to a cyclone separation device with a secondary separation function and a method for using the same. Background Art

[0002] Cyclone separators are widely used in industrial fields such as cement, chemical industry, environmental protection, and power generation, and are key equipment for realizing gas-solid separation. A conventional cyclone separator is composed of structures such as an inlet, a volute, an inner cylinder, a straight cylinder section, a cone, and a discharge port, and the structure of the cyclone separator largely determines its separation efficiency and resistance loss.

[0003] Currently, the cyclone separators in use usually discharge air from the lower end of the inner cylinder. When using this lower-end air discharge method, the gas needs to rotate inside the inner cylinder to the lower part of the inner cylinder before it can enter the inner cylinder and be discharged from the air outlet. Therefore, the gas has a long travel distance in the cyclone cylinder, and there is a right-angle turning loss of the air flow, resulting in a large resistance of the gas in the cyclone cylinder. The large resistance increases the load on the fan and causes an increase in the power consumption of the fan. Summary of the Invention

[0004] The purpose of the present invention is to provide a cyclone separation device with a secondary separation function and a method for using the same. The inner cylinder of the cyclone separation device with a secondary separation function is provided with a side air outlet, which improves the air outlet mode of the gas and effectively reduces the system resistance.

[0005] To achieve the above object, the present invention provides a cyclone separation device with a secondary separation function, including a device body, an inner cylinder, an air inlet provided on the device body, a first air outlet provided on the side of the inner cylinder, and a discharge port located at the lower end of the device body;

[0006] The inner cylinder is provided as a cone, the upper end of the conical inner cylinder is provided as a small end with a diameter of d1, and the lower end is provided as a large end with a diameter of d2.

[0007] The first air outlet is provided at a position on the inner cylinder away from the air inlet along the gas flow direction.

[0008] Preferably, the first air outlet is provided along the generatrix direction of the inner cylinder throughout the length.

[0009] Preferably, the device body includes a volute, a straight cylinder section, and a skew cone connected in sequence from top to bottom. The air inlet is communicated with the volute, the discharge port is provided at the lower end of the skew cone, the inner cylinder is inserted into the device body from the top of the volute, the height of the volute is set as h, and the insertion depth of the inner cylinder is set as h1, then h1 = h is satisfied.

[0010] Preferably, a conical bin for collecting dust is connected to the lower end of the conical inner cylinder.

[0011] Preferably, a blanking chute pipe communicating with the conical bin is arranged at the lower end of the conical bin.

[0012] Preferably, a diffusion port for separating the trailing vortex air flow from the powder is connected to the lower end of the blanking chute pipe.

[0013] Preferably, the air inlet is communicated with the volute and is tangent to the volute.

[0014] Preferably, one side of the first air outlet far away from the air inlet along the air flow direction is connected to the end of the volute through a flow guiding partition plate.

[0015] Preferably, the end of the flow guiding partition plate connected to the inner cylinder is tangent to the inner cylinder.

[0016] The present invention also provides a method for using the cyclone separation device with the secondary separation function, including:

[0017] Step 1: Introduce the dusty gas into the air inlet.

[0018] Step 2: The dusty gas rotates around the volute for primary separation. The separated dust falls into the eccentric cone, and the separated gas enters the inner cylinder from the first air outlet.

[0019] Step 3: The dusty gas rotates in the inner cylinder for secondary separation. The separated dust falls into the conical bin, and the separated gas is discharged from the second air outlet of the inner cylinder.

[0020] Step 4: The dust in the conical bin falls into the eccentric cone through the blanking chute pipe, and the dust in the eccentric cone is discharged through the discharge port.

[0021] According to the above technical solution, the dusty gas of the present invention enters the device body through the air inlet and rotates in the device body. During the rotation process, the dust will be thrown to the side wall of the device body under the action of centrifugal force, and lose kinetic energy after contacting the side wall. The dust that loses kinetic energy cannot continue to rotate with the gas, and will gradually slide down along the side wall of the device body and finally be discharged through the discharge port at the lower end of the device body.

[0022] During the rotation of the gas, the dust with large particles has large inertia and will first collide with the side wall. As the diameter of the gas rotation section in the device body gradually becomes smaller, the air flow speed gradually increases, and the centrifugal force becomes larger and larger. More and more particles will be thrown to the side wall and collected. The first air outlet is arranged on the side wall of the inner cylinder 1. During the rotation of the gas, these gases will pass through the position of the first air outlet and enter the inner cylinder from the first air outlet.

[0023] During the rotation process, the airflow will rub against the inner wall of the cyclone separation device, generating frictional resistance along the way. The greater the airflow velocity, the greater the frictional resistance along the way. Therefore, the longer the travel of the gas, the longer the time it is subjected to the frictional resistance along the way, that is, the longer the gas travel, the greater the resistance of the system to the airflow. Setting the first air outlet on the side wall of the inner cylinder enables the airflow to directly enter the inner cylinder from the side of the inner cylinder during the rotation process without having to rotate to the lower part of the inner cylinder in the cyclone separation device all the time, and it can enter the inner cylinder from the first air outlet without experiencing a right-angle turn, effectively reducing the resistance of the gas in the device body.

[0024] Although the long travel of the gas in the device body will cause kinetic energy loss of the gas in the cyclone separation device, the long rotation travel of the gas also provides sufficient time for the solid-gas separation effect, enabling the solid dust in the gas to be effectively separated and improving the efficiency of solid-gas separation. Preferably, the first air outlet is set at a position on the inner cylinder away from the air inlet along the airflow direction, enabling the gas to stay in the cyclone separation device for as long as possible, so that as much solid dust as possible can be collected, thereby ensuring the efficiency of solid-gas separation while reducing the system resistance.

[0025] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0026] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0027] Figure 1 is a schematic structural diagram of a cyclone separation device with a secondary separation function;

[0028] Figure 2 is a schematic diagram of the connection between a guide baffle and the first air outlet;

[0029] Figure 3 is a schematic structural diagram of a volute.

[0030] Description of the Reference Numerals in the Drawings

[0031] 1 Inner cylinder 2 Air inlet

[0032] 3 First air outlet 4 Discharge port

[0033] 51 Volute 52 Straight cylinder section

[0034] 53 Tapered cone 11 Conical bin

[0035] 12 Feed chute 13 Diffuser

[0036] 14 Flow Deflector Detailed Embodiment

[0037] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0038] In the present invention, unless otherwise stated, the directional terms included in terms such as "side, lower end, away from, inside, insert" only represent the direction of the term in its normal use state, or the common name understood by those skilled in the art, and should not be regarded as a limitation of the term.

[0039] As Figures 1-3 A cyclone separation device with a secondary separation function as described above includes a device body, an inner cylinder 1, an air inlet 2 provided on the device body, a first air outlet 3 provided on the side of the inner cylinder 1, and a discharge port 4 located at the lower end of the device body;

[0040] The first air outlet 3 is provided at a position on the inner cylinder 1 away from the air inlet 2 along the air flow direction.

[0041] By implementing the above technical solution, the dust-containing gas enters the device body through the air inlet 2 and rotates in the device body. During the rotation process, the dust will be thrown to the side wall of the device body under the action of centrifugal force, and after contacting the side wall, the kinetic energy will be lost. The dust that has lost kinetic energy cannot continue to rotate with the gas, and will gradually slide down along the side wall of the device body and finally be discharged from the discharge port 4 at the lower end of the device body.

[0042] During the rotation of the gas, the dust with large particles has a large inertia and will first collide with the side wall. As the diameter of the gas rotation section in the device body gradually decreases, the air flow velocity gradually increases, and the centrifugal force also becomes larger and larger. More and more particles will be thrown to the side wall and collected. The first air outlet 3 is provided on the side wall of the inner cylinder 1. During the rotation of the gas, these gases will pass through the position of the first air outlet 3 and enter the inner cylinder 1 through the first air outlet 3.

[0043] During the rotation process, the air flow will rub against the inner wall of the cyclone separation device to generate frictional resistance along the way. The greater the air flow velocity, the greater the frictional resistance along the way. Therefore, the longer the travel distance of the gas, the longer the time it is affected by the frictional resistance along the way, that is, the longer the travel distance of the gas, the greater the resistance of the system to the air flow. Setting the first air outlet 3 on the side wall of the inner cylinder 1 enables the air flow to directly enter the inner cylinder 1 from the side of the inner cylinder 1 during the rotation process without having to rotate to the lower part of the inner cylinder 1 in the cyclone separation device all the time, and can enter the inner cylinder 1 through the first air outlet 3 without having to experience a right-angle turn, which can effectively reduce the resistance of the gas in the device body.

[0044] Although a long travel distance of the gas within the device body may lead to kinetic energy loss of the gas in the cyclone separation device, a long rotation travel distance of the gas also provides sufficient time for the solid-gas separation effect, enabling the solid dust in the gas to be effectively separated and improving the efficiency of solid-gas separation. Preferably, the first air outlet 3 is arranged at a position on the inner cylinder 1 away from the air inlet 2 along the air flow direction, so that the gas can stay in the cyclone separation device for as long as possible, enabling as much solid dust as possible to be collected, thereby ensuring the efficiency of solid-gas separation while reducing the system resistance.

[0045] The inner cylinder 1 is arranged in a conical shape. The upper end of the conical inner cylinder 1 is set as the small end with a diameter of d1, and the lower end is set as the large end with a diameter of d2.

[0046] After the dust-containing gas enters the cyclone separation device, it starts to rotate under the action of the volute 51. Under the action of the volute 51, the speed of the gas increases after entering the volute 51. Therefore, after entering the volute 51, while the speed of the gas increases, the direction of the speed is also constantly changing. Due to the greater inertia of the solid particles, during the acceleration and turning of the gas, some larger solid particles are thrown towards the inner wall of the volute 51 and collide with the inner wall of the volute 51. After the collision, the kinetic energy of these solid particles is lost and they cannot continue to rotate with the gas, so they will slide down along the inner wall of the device body. This is the first solid-gas separation effect of the cyclone separation device on the dust-containing gas. During this solid-gas separation process, the large particles will be separated first, and some small particles can still continue to rotate with the gas and enter the inner cylinder 1 through the first air outlet 3.

[0047] Since the inner cylinder 1 is arranged in a conical shape with the upper part smaller and the lower part larger, as the gas rotates within the volute 51, the cross-sectional area of the volute 51 near the lower part of the inner cylinder 1 gradually decreases, and the speed of the gas gradually increases. Therefore, during the rotation of the gas, the solid particles in the gas are continuously pushed towards the inner wall of the volute 51, enabling more solid particles to be collected during the first solid-gas separation process, thereby effectively improving the separation efficiency of the cyclone separation device.

[0048] After the mixed gas enters the inner cylinder 1, it will continue to rotate along the side wall of the inner cylinder 1 and gradually rise during the rotation until it enters the second air outlet at the top of the inner cylinder 1 and is discharged from the second air outlet. During the process of the mixed gas rotating and rising in the inner cylinder 1, the cross-sectional area of the inner cylinder 1 gradually becomes smaller. Therefore, the speed of the mixed gas will gradually increase. However, due to the large inertia of the dust, it cannot keep up with the gas. Therefore, the dust in the mixed gas will continuously collide with the inner wall of the inner cylinder 1 during the upward movement, losing kinetic energy and sliding down along the inner wall of the inner cylinder 1. The speed of the gas entering the inner cylinder 1 will also increase, and since the inner cylinder 1 is conical, the speed of the gas will gradually increase. During the upward movement of the dust, due to its large inertia, it cannot move synchronously with the gas. Therefore, the solid particles will impact the barrel wall of the inner cylinder 1 during the upward movement and will ultimately be collected due to the loss of kinetic energy. This is the second solid-gas separation of the cyclone separation device with the secondary separation function. During the second solid-gas separation process, as the gas continuously moves upward, the cross-sectional area of the inner cylinder 1 continuously increases, and the gas speed inside the inner cylinder 1 gradually increases. Similarly, as the gas flow rate increases, more solid particles will be pushed to the side wall of the inner cylinder 1 and collide with the side wall of the inner cylinder 1, so that more solid particles are collected.

[0049] Therefore, setting the inner cylinder 1 as a cone with a smaller upper part and a larger lower part can achieve two-stage solid-gas separation of the mixed gas. Moreover, setting the conical inner cylinder 1 enables the gas speed to gradually increase during the two-stage solid-gas separation process, thus ensuring the separation effect of the two-stage solid-gas separation. Therefore, setting the conical inner cylinder 1 is very beneficial to improving the separation efficiency of the cyclone separation device.

[0050] In this embodiment, preferably, the first air outlet 3 is provided along the generatrix direction of the inner cylinder 1 throughout its length.

[0051] When the inner cylinder 1 is set as a cone with a smaller upper end and a larger lower end, since the first air outlet 3 is provided along the generatrix direction of the inner cylinder 1 throughout its length, the first air outlet 3 will also be in the situation of having a smaller upper part and a larger lower part. Then, the gas near the upper part of the inner cylinder 1 in the cyclone separation device has a shorter travel distance in the cyclone separation device, and the solid separation is not sufficient. Correspondingly, the opening of the first air outlet 3 at this position is smaller, and the gas is not easy to enter. While the gas near the lower part of the inner cylinder 1 has a longer travel distance in the cyclone separation device, and the solid-gas separation has been carried out for a period of time. The opening of the first air outlet 3 corresponding to this position is larger, and the gas can enter the inner cylinder 1 more easily. Therefore, the gas with insufficient solid-gas separation is more difficult to enter the inner cylinder 1 from the first air outlet 3 than the gas with sufficient solid-gas separation. Therefore, the first air outlet 3 with a smaller upper part and a larger lower part can effectively improve the efficiency of the first solid-gas separation.

[0052] In this embodiment, preferably, the device body includes a volute 51, a straight cylinder section 52, and an inclined cone 53 that are connected in sequence from top to bottom. The air inlet 2 communicates with the volute 51, the discharge port 4 is arranged at the lower end of the inclined cone 53, the inner cylinder 1 is inserted into the device body from the top of the volute 51. The height of the volute 51 is set as h, and the insertion depth of the inner cylinder 1 is set as h1, then h1 = (0.3 - 1)h is satisfied.

[0053] The greater the insertion depth of the inner cylinder 1, the longer the travel of the gas in the device body will be correspondingly, and then the greater the kinetic energy loss of the gas. Therefore, considering from the perspective of reducing the system resistance, the insertion depth of the inner cylinder 1 should be set as small as possible. Preferably, the insertion depth of the inner cylinder 1 is set to be not greater than the height of the volute 51, which can minimize the system resistance to the greatest extent.

[0054] During the rotation of the gas, the solid particles will be continuously thrown towards the inner wall of the volute 51 during the rotation process. After the solid particles impact the inner wall of the volute 51, their kinetic energy is lost and collected. Therefore, increasing the residence time of the gas in the device body can significantly improve the separation efficiency of the cyclone separator.

[0055] The travel of the gas in the device body will affect the residence time of the gas in the cyclone separator. The longer the travel of the gas in the device, the longer the residence time. Therefore, the insertion depth of the inner cylinder 1 will affect the solid-gas separation efficiency of the cyclone separator. The greater the insertion depth of the inner cylinder 1, the higher the solid-gas separation efficiency of the cyclone separator. Since the first air outlet 3 is arranged on the side of the inner cylinder 1, therefore, the gas does not have to rotate to the lower end of the inner cylinder 1, but continuously has gas entering the inner cylinder 1 through the first air outlet 3 during the rotation process. Therefore, as the insertion depth of the inner cylinder 1 increases, the remaining rotating gas is gradually decreasing. Therefore, it is not that the greater the insertion depth of the inner cylinder 1, the higher the separation efficiency of the cyclone separator. Preferably, the maximum insertion depth h1 of the inner cylinder 1 is set to 1h. At this time, almost all the gas in the cyclone separator is captured by the first air outlet 3, and the resistance of the system will not increase significantly either.

[0056] Therefore, preferably, when the insertion depth of the inner cylinder 1 is set as h1 = (0.3 - 1)h, a better solid-gas separation effect can be obtained without significantly increasing the system resistance.

[0057] The first air outlet 3 is set to account for 1 / 10 - 1 / 2 of the surface area of the inner cylinder 1.

[0058] The size of the first air outlet 3 is coordinated with the insertion depth h1 of the inner cylinder 1, which can control the separation efficiency of the cyclone separation device. When the opening of the first air outlet 3 is set to be relatively large, the gas can quickly enter the inner cylinder 1 from the first air outlet 3 during the rotation process. At the same time, as the insertion depth of the inner cylinder 1 increases, the remaining gas will become less and less. Therefore, the insertion depth h1 of the inner cylinder 1 does not need to be set very large to discharge all the gas in the device body. Therefore, when the first air outlet 3 is set to be relatively large and the insertion depth of the inner cylinder 1 is relatively small, the system resistance is small, and at the same time, the solid-gas separation efficiency is low. When the opening of the first air outlet 3 is set to be relatively small, the gas is not easily introduced into the first air outlet 3 during the rotation process. Then, the travel of the gas in the device body needs to be increased. Therefore, correspondingly, the insertion depth of the inner cylinder 1 needs to be larger so that the gas in the device body can rotate around the inner cylinder 1 for a greater travel. Therefore, when the first air outlet 3 is set to be relatively small and the insertion depth of the inner cylinder 1 is relatively large, the system resistance is large, and at the same time, the solid-gas separation efficiency is high.

[0059] Preferably, according to actual experience, when the first air outlet 3 is set to account for 1 / 10 of the surface area of the inner cylinder 1, the cyclone separation device can obtain the best solid-gas separation efficiency. When the first outlet is less than 1 / 10 of the surface area of the inner cylinder 1, the travel of the gas in the cyclone separation device will become longer, the system resistance will become larger, and even the gas will enter the lower part of the cyclone separation device, resulting in an unstable flow field in the cyclone separation device.

[0060] When the first air outlet 3 is set to account for 1 / 2 of the surface area of the inner cylinder 1, all the gas in the volute 51 can move to the inner cylinder 1. When the first air outlet 3 is larger than 1 / 2 of the surface area of the inner cylinder 1, the gas in the volute 51 can almost immediately enter the first air outlet 3, and the separation efficiency of the cyclone separation device is extremely low.

[0061] Therefore, in actual production, the size of the first air outlet 3 can be selected according to needs, and the first air outlet 3 is set to account for 1 / 10 - 1 / 2 of the surface area of the inner cylinder 1.

[0062] In this embodiment, preferably, the lower end of the conical inner cylinder 1 is connected with a conical bin 11 for collecting dust.

[0063] The second solid-gas separation of the mixed gas can be realized in the conical inner cylinder 1. Therefore, setting the conical bin 11 at the lower end of the inner cylinder 1 can collect the solid particles obtained from the second solid-gas separation. On the one hand, it can prevent these particles from entering the cyclone separation device and affecting the gas flow in the cyclone separation device. At the same time, it can also reliably maintain the solid-gas separation result.

[0064] In this embodiment, preferably, a feeding chute 12 communicating with the conical bin 11 is provided at the lower end of the conical bin 11.

[0065] Through the blanking chute 12, the solid particles in the conical bin 11 can be timely transported outwards, avoiding the accumulation of solid particles in the conical bin 11. When the solid particles in the conical bin 11 accumulate to a certain height, the rotating air flow in the inner cylinder 1 will blow up these solid particles, resulting in a dust-raising effect, which will affect the effect of the second solid-gas separation in the inner cylinder 1.

[0066] In this embodiment, preferably, the lower end of the blanking chute 12 is connected with a diffusion port 13 for separating the trailing vortex air flow from the powder.

[0067] Through the blanking chute 12, the solid particles collected in the conical bin 11 can be transported into the bin of the inclined cone 53. The bin of the inclined cone 53 also collects the powder flowing down along the inner wall of the device body. By setting the diffusion port 13, a physical separation can be carried out between the trailing vortex air flow above the inclined cone 53 and the powder, effectively avoiding the dust-raising phenomenon caused by the trailing vortex air flow blowing the powder.

[0068] In this embodiment, preferably, the device body includes a volute 51, and the air inlet 2 is arranged on the volute 51 and is tangent to the volute 51.

[0069] Setting the air inlet 2 to be tangent to the volute 51 enables the mixed gas to move along the inner wall of the volute 51 after entering the volute 51 and start to rotate under the guiding action of the volute 51. In this way, the resistance caused by the sudden straightening of the gas can be reduced, thereby reducing the resistance of the system to the gas. The solid particles collide with the side wall of the volute 51 during the rotation process and flow into the lower inclined cone 53 along the inner wall.

[0070] In this embodiment, preferably, the first air outlet 3 is connected to the end of the volute 51 through a guiding partition 14 on the side away from the air inlet 2 along the air flow direction.

[0071] A guiding partition 14 is arranged at the front end of the first air outlet 3 on the side of the inner cylinder 1 and the end of the volute 51, which plays a role in guiding the flow and enhancing the separation efficiency of fine dust.

[0072] Setting the guiding partition 14 can achieve the effect of guiding the flow of the mixed gas. The mixed gas moves along the guiding partition 14 and gradually enters the inner cylinder 1, and then starts to rotate along the inner wall of the inner cylinder 1.

[0073] Preferably, the flow guiding partition 14 is set to be arc-shaped. During the process that the gas gradually approaches the first outlet along the flow guiding partition 14, the movement direction of the gas constantly changes, and at the same time the speed of the gas continuously increases. Driven by inertia and the high-speed gas, solid particles in the mixed gas will constantly impact the flow guiding partition 14. After these solid particles impact, they lose kinetic energy and slide downward along the flow guiding partition 14, and finally fall into the inclined cone 53 to be collected. Therefore, setting the flow guiding partition 14 can achieve the separation effect on fine dust.

[0074] In this embodiment, preferably, one end of the flow guiding partition 14 connected to the inner cylinder 1 is tangent to the inner cylinder 1.

[0075] One end of the flow guiding partition 14 connected to the inner cylinder 1 is tangent to the inner cylinder 1, so that after the mixed gas enters the inner cylinder 1, it can first move along the side wall of the inner cylinder 1, thereby minimizing the resistance of the inner cylinder 1 to the gas to the greatest extent. Subsequently, during the upward movement of the mixed gas, the solid particles in the mixed gas impact the inner wall of the inner cylinder 1 and fall into the lower conical bin 11 along the inner wall of the inner cylinder 1.

[0076] The present invention also provides a use method of a cyclone separation device with a secondary separation function, which is characterized by including:

[0077] Step 1: Feed the dust-containing gas into the air inlet 2;

[0078] Step 2: The dust-containing gas rotates around the volute 51 for primary separation. The separated dust falls into the inclined cone 53, and the separated gas enters the inner cylinder 1 from the first air outlet 3;

[0079] Step 3: The dust-containing gas rotates in the inner cylinder 1 for secondary separation. The separated dust falls into the conical bin 11, and the separated gas is discharged from the second air outlet of the inner cylinder 1;

[0080] Step 4: The dust in the conical bin 11 falls into the inclined cone 53 through the blanking chute 12, and the dust in the inclined cone 53 is discharged through the discharge port 4.

[0081] Through the implementation of the above technical solution, the dust-containing mixed gas enters the volute 51 through the air inlet 2 and starts to rotate under the guiding action of the inner wall of the volute 51. During the rotation process, the speed of the mixed gas gradually increases. Therefore, the larger solid particles in the mixed gas will impact the inner wall of the volute 51 under the action of the gas pushing and its own inertia. After the impact occurs, these larger solid particles cannot continue to rotate at high speed with the gas due to the loss of kinetic energy, and will slide downward along the inner wall of the device body and finally be collected in the inclined cone 53. This is the first solid-gas separation of the cyclone separation device.

[0082] After the first solid-gas separation, some smaller solid particles still remain in the mixed gas. This mixed gas enters the inner cylinder 1 through the first air outlet 3, continues to rotate inside the inner cylinder 1, and finally is discharged from the second air outlet at the upper end of the inner cylinder 1. During the upward movement of the mixed gas, the gas velocity gradually increases. The increasing gas velocity will push the solid particles towards the side wall of the inner cylinder 1. Therefore, as the mixed gas rises, there will constantly be solid particles hitting the side wall of the inner cylinder 1. These solid particles hitting the side wall of the inner cylinder 1 will slide down along the side wall of the inner cylinder 1 and enter the lower conical bin 11. This is the second solid-gas separation of the cyclone separation device. The separated solid particles fall into the conical bin 11 and enter the inclined cone 53 through the blanking chute 12, and are discharged through the discharge port 4 together with the solid particles obtained from the first solid-gas separation. The gas obtained from the second solid-gas separation will be discharged from the second air outlet at the upper end of the inner cylinder 1.

[0083] Preferably, in step three, the velocity of the dust-containing gas increases after entering the inner cylinder 1. In step three, the inner cylinder 1 needs to utilize the inertia of the solid particles to make the solid particles collide with the side wall of the inner cylinder 1, so as to achieve the collection effect of the solid particles. By increasing the velocity of the dust-containing gas after entering the inner cylinder 1, the gas in the inner cylinder 1 can continuously push the solid particles to collide with the side wall of the inner cylinder 1 during the rotation process, thus achieving a better solid-gas separation effect.

[0084] Preferably, the large-end diameter d2 is set to be not greater than 0.7D, so that the cross-sectional area outside the inner cylinder 1 is larger than the cross-sectional area inside the inner cylinder 1. Then the velocity of the gas will increase after entering the inner cylinder 1. The smaller the large-end diameter d2 of the inner cylinder 1, the more obvious the increase in the velocity of the gas after entering the inner cylinder 1.

[0085] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0086] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0087] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A cyclone separation device with secondary separation function, characterized in that: It comprises a device body, an inner cylinder (1), an air inlet (2) arranged on the device body, a first air outlet (3) arranged on the side of the inner cylinder (1), and a discharge port (4) located at the lower end of the device body; The inner cylinder (1) is configured to be conical, the upper end of the conical inner cylinder (1) is configured to be a small end, the diameter of the small end is d1, and the lower end is configured to be a large end, the diameter of the large end is d2; The first air outlet (3) is arranged at a position of the inner cylinder (1) away from the air inlet (2) along the air flow direction.

2. The cyclone separation device with secondary separation function according to claim 1, characterized in that: The first air outlet (3) is arranged along the generatrix direction of the inner tube (1) throughout its length.

3. The cyclone separation device with secondary separation function according to claim 1, characterized in that: The device body comprises a volute (51), a straight tube section (52) and a skew cone (53) which are connected in sequence from top to bottom. The air inlet (2) is connected to the volute (51). The discharge port (4) is arranged at the lower end of the skew cone (53). The inner tube (1) is inserted into the device body from the top of the volute (51). The height of the volute (51) is set to h, and the insertion depth of the inner tube (1) is set to h1, so that h1=(0.3-1.5)h is satisfied.

4. The cyclone separation device with secondary separation function according to claim 3, characterized in that: The lower end of the conical inner cylinder (1) is connected to a conical bin (11) for collecting dust.

5. The cyclone separation device with secondary separation function according to claim 4, characterized in that: The lower end of the conical bin (11) is provided with a material discharge chute (12) which is in communication with the conical bin (11).

6. The cyclone separation device with secondary separation function according to claim 5, characterized in that: The lower end of the material discharge chute (12) is connected with a diffusion port (13) for isolating the tail vortex airflow from the powder.

7. The cyclone separation device with secondary separation function according to claim 4, characterized in that: The air inlet (2) is communicated with the volute (51) and is tangent to the volute (51).

8. The cyclone separation device with secondary separation function according to claim 4, characterized in that: The side of the first air outlet (3) away from the air inlet (2) along the air flow direction is connected to the end of the volute (51) via a guide baffle (14).

9. The cyclone separation device with secondary separation function according to claim 8, characterized in that: One end of the guide baffle (14) connected to the inner tube (1) is tangent to the inner tube (1).

10. A method for using the cyclone separation device with secondary separation function according to any one of claims 4 to 9, characterized in that: include: Step 1: Pass dust-laden gas into the air inlet (2); Step 2: The dust-containing gas rotates around the volute (51) to be separated, and the separated dust falls into the skew cone (53), and the separated gas enters the inner cylinder (1) through the first air outlet (3); Step 3: The dust-containing gas rotates in the inner cylinder (1) for secondary separation, and the separated dust falls into the conical bin (11), and the separated gas is discharged from the second air outlet of the inner cylinder (1); Step 4: The dust in the conical bin (11) falls into the crooked cone (53) through the discharge chute (12), and the dust in the crooked cone (53) is discharged through the discharge port (4).

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