Cyclone and cloth bag coupled dust removal device

Abstract

The utility model cyclone and cloth bag coupling dust removal device, including the casing, be provided with the flower board in the inside of casing, the flower board divides the inside of casing into the clean gas chamber and cloth bag dust removal space, be equipped with the clean gas export on the casing of clean gas chamber, a plurality of filter bags are installed on the flower board, have cloth bag ash drop connecting pipe in the bottom of cloth bag dust removal space, be equipped with cyclone cylinder in cloth bag dust removal space, the upper portion of cyclone cylinder is the cylinder body and is the conical cylinder body for lower part, be connected with cyclone export connecting pipe in the cylinder body top of cyclone cylinder, cyclone export connecting pipe is stretched out on the casing or directly stretches into and communicates cloth bag dust removal space, be connected with cyclone ash drop connecting pipe in the conical cylinder body bottom of cyclone cylinder, be equipped with tangential inlet on the cylinder wall of cyclone cylinder, tangential inlet connects cyclone import connecting pipe, cyclone import connecting pipe stretches out on the casing, be provided with the spiral hole with helix line shape formed along the spiral motion track of rotating air current and set up on the cylinder wall of cyclone cylinder. The utility model has improved cyclone dust removal efficiency's advantage.

Description

Technical Field

[0001] This utility model relates to the field of industrial dust removal technology, and in particular to a device for dust removal that couples cyclone dust removal with bag dust removal. Background Technology

[0002] Dust removal is a crucial step in industrial waste gas treatment. Cyclone dust collectors and baghouse dust collectors (also known as bag filters) are commonly used dust removal methods. Cyclone dust collectors use centrifugal force to separate larger dust particles and are typically used as preliminary dust removal equipment, while baghouse dust collectors use filter bags to intercept fine dust particles and are typically used as fine dust removal equipment. However, they are usually used independently to achieve dust removal.

[0003] Existing cyclone dust collectors generally consist of components such as a cyclone tube, a cyclone top cover, a cyclone outlet pipe, and a cyclone dust collection pipe. The upper part of the cyclone tube is cylindrical, and the lower part is conical. The dust removal process of a cyclone dust collector is as follows: Dust-laden airflow enters the cyclone tube tangentially through the tangential inlet, causing the airflow to form a spiraling downward flow along the inner wall of the cyclone tube (i.e., external vortex). Dust particles are thrown towards the inner wall of the cyclone tube due to centrifugal force. After colliding with the inner wall, the dust particles lose kinetic energy and slide down the inner wall to the bottom of the cyclone tube, eventually exiting through the cyclone dust collection pipe at the bottom. The descending airflow reaches the bottom of the conical tube and then turns upward along the axis, forming an internal vortex, which is then discharged through the cyclone outlet pipe at the top of the cyclone tube. This achieves the separation of dust particles from the gas, completing the dust removal process.

[0004] The current problem is:

[0005] (1) Separate equipment, large system: Cyclone dust collectors and bag dust collectors are usually arranged in series as independent equipment. This separate design not only results in a large footprint, complex pipeline connections, and large overall equipment for the entire dust collection system, but also requires long connecting pipelines for airflow to be transported between independent equipment, resulting in significant friction loss, high energy consumption, and high operating costs.

[0006] (2) During the cyclone dust removal process, dust particles are thrown against the inner wall of the cyclone due to centrifugal force. In addition to sliding down the inner wall to the bottom of the cyclone and being discharged, they may also stick to the wall and rebound.

[0007] Among them, wall adhesion refers to the direct adhesion of easily sticky dust particles to the wall surface of the cyclone after impact. Severe wall adhesion can cause dust accumulation inside the cyclone, thus affecting the dust removal efficiency of the cyclone.

[0008] The term "rebound" refers to the phenomenon where, due to the rebound effect of the cyclone wall on particles in the airflow, some dust particles, after colliding with the cyclone wall, rebound and re-enter the inner vortex, which is far from the cyclone wall. These particles are then discharged from the cyclone outlet pipe with the inner vortex, preventing timely separation and reducing the cyclone dust removal efficiency. Furthermore, these rebounding dust particles, re-entering the inner vortex and being discharged from the cyclone outlet pipe, increase the particle concentration of the airflow discharged from the cyclone outlet pipe. Since the airflow discharged from the cyclone outlet pipe has high velocity and temperature, when this high-concentration, high-speed, and high-temperature airflow is discharged into the subsequent baghouse dust collector for fine dust removal, the filter bags in the baghouse are easily damaged by the high-concentration, high-speed, and high-temperature airflow, thus affecting the service life and dust removal efficiency of the baghouse dust collector.

[0009] (3) For existing bag filter dust collectors, due to their low internal airflow velocity, usually between 2 and 5 m / min, according to the calculation formula for the gas flow rate of the bag filter dust collector, Q = V × A × 60, where Q represents the gas flow rate, V is the filtration velocity, and A is the filtration area; under the same gas flow rate, due to the slow airflow velocity, the bag filter dust collector needs to have a large volume in order to meet the processing requirements. This not only results in a large footprint but also high equipment investment costs, which limits the application of bag filter dust collection technology in some site-constrained or cost-sensitive projects.

[0010] (4) The performance of baghouse dust collectors is greatly affected by the temperature of the dust-laden airflow. If high-temperature airflow enters the baghouse dust collector directly, it will exceed the operating temperature range that the filter bags can withstand, leading to filter bag damage and affecting the normal operation of the dust collector. Therefore, when using baghouse dust collectors, it is often necessary to cool down the high-temperature airflow to adapt to the operating temperature of the baghouse dust collector. This undoubtedly increases the complexity of the equipment and the operating cost. Utility Model Content

[0011] The purpose of this invention is to provide a cyclone and bag coupling dust collection device that can improve the efficiency of cyclone dust collection and help extend the service life of filter bags in bag dust collection space.

[0012] To achieve the above objectives, the present invention adopts the following technical solution: a cyclone and bag filter coupling dust collector, comprising a housing, inside which a tube sheet is provided, dividing the interior of the housing into an upper clean air chamber and a lower bag filter dust collection space. A clean air outlet is provided on the housing of the clean air chamber. Several filter bags extending into the bag filter dust collection space are installed on the tube sheet. A bag dust discharge pipe, serving as a dust discharge channel for the filter bags, is connected to the bottom of the bag filter dust collection space. A cyclone is provided in the bag filter dust collection space, the upper part of which is cylindrical and the lower part is conical. A cyclone outlet pipe is connected to the top of the cylindrical part of the cyclone, extending out of the housing or directly into the connecting bag filter. The bag filter space includes a cyclone dust collection pipe connected to the bottom of the conical body of the cyclone separator, which serves as a dust removal channel. The cyclone dust collection pipe extends downward from the shell. A tangential air inlet is provided on the cylindrical wall of the cyclone separator. After the dust-laden airflow enters the cyclone separator through the tangential air inlet, it forms a rotating airflow that spirals downward along the inner wall of the cyclone separator. The tangential air inlet is connected to a cyclone inlet pipe, which extends out from the shell. A spiral hole with a spiral shape is provided on the cylindrical wall of the cyclone separator, which is arranged along the spiral trajectory of the rotating airflow. The spiral hole penetrates the thickness of the cyclone separator wall so that the internal space of the cyclone separator can be connected to the bag filter space through the spiral hole.

[0013] Furthermore, in the aforementioned cyclone and bag filter coupling dust removal device, a spiral hole is provided on the cylindrical wall of the cyclone tube, and the number of turns of the spiral hole is consistent with the number of rotations of the rotating airflow within the cylindrical body of the cyclone tube when it moves downward in a spiral motion.

[0014] Furthermore, in the aforementioned cyclone and bag filter coupling dust removal device, each filter bag in the bag filter dust removal space is arranged around the cyclone to form at least one ring array. The cross-section of the filter bag is circular or trapezoidal. When the cross-section of the filter bag is trapezoidal, the filter bag is arranged with the shorter base of the trapezoidal cross-section close to the cyclone and the longer base away from the cyclone.

[0015] Furthermore, in the aforementioned cyclone and bag filter coupled dust collection device, the cyclone dust collection pipe is set independently of the bag filter dust collection pipe, and the cyclone dust collection pipe and the bag filter dust collection pipe do not share the same dust discharge channel.

[0016] Furthermore, in the aforementioned cyclone and bag filter coupling dust removal device, a heat exchange device is provided on the cyclone tube to cool down the airflow inside the cyclone tube.

[0017] Furthermore, in the aforementioned cyclone and bag filter coupling dust removal device, the structure of the heat exchange device includes: several heat exchange tubes, each heat exchange tube being closely arranged at intervals along the circumference of the cyclone tube in contact with the cyclone tube wall; one end of all heat exchange tubes is simultaneously connected to an annular water inlet header, and a water inlet pipe extending out of the shell is connected to the water inlet header; the other end of the heat exchange tubes is simultaneously connected to an annular water outlet header, and a water outlet pipe extending out of the shell is connected to the water outlet header.

[0018] Furthermore, in the aforementioned cyclone and bag filter coupling dust removal device, each heat exchange tube and the cyclone tube form a cylindrical membrane wall with a continuous circumferential corrugated structure on its inner wall surface.

[0019] The beneficial effects of implementing the above technical solution are as follows:

[0020] (1) During the process of cyclone dust removal, the rotating airflow rotates downward in the cyclone tube and is directly guided to the bag filter space through specific spiral holes opened in the cyclone tube wall. Since the dust particles directly guided to the bag filter space will not collide with the inner wall of the cyclone tube, they will not stick to the wall or rebound. This effectively reduces the proportion of dust particles sticking to the cyclone tube wall and rebounding into the inner cyclone. The reduction in the proportion of dust particles rebounding into the inner cyclone improves the dust removal efficiency of the cyclone dust removal itself. The reduction in the number of particles sticking to the wall ensures the operational stability of the cyclone tube.

[0021] (2) The specific trajectory design of the spiral hole is to reduce particle rebound. When the particles move towards the inner wall of the cyclone along the spiral trajectory, if the impact point is located at the spiral hole, the particles can enter the dust collection space of the bag instead of rebounding. The second is to maintain airflow stability. Mismatched openings will disrupt the rotating flow field. The third is to improve the diversion efficiency. Matched opening positions can accurately capture high-concentration particle flow.

[0022] (3) The diversion design significantly reduces the dust particle concentration, velocity and temperature in the mainstream airflow discharged from the top of the cyclone (especially when combined with the heat exchange device for cooling), which reduces the load of bag fine dust removal in the bag dust removal space, avoids the direct scouring of the filter bags in the bag dust removal space by high-speed, high-temperature and high-concentration dust airflow, and significantly extends the service life of the filter bags in the bag dust removal space.

[0023] (4) By adjusting the position of the cyclone outlet, it can adapt to various operating conditions. When the outlet of the cyclone is located outside the shell, this dust removal device can be used as a separate preliminary dust removal device. When handling the same amount of air, the cyclone dust removal efficiency of this dust removal device is better than that of traditional cyclone dust collectors.

[0024] When the outlet of the cyclone separator is located in the bag filter space within the casing, this dust collector is an integrated dust collection structure that connects the cyclone separator and the filter bag in series, enabling fine dust removal of the dust-laden airflow. When handling the same air volume, compared to the traditional integrated dust collection structure where the cyclone dust collector and the bag filter are connected in series through pipelines, this dust collector has a more compact structure, avoiding direct scouring of the filter bags in the bag filter space by high-speed, high-temperature, and high-concentration dust airflow, significantly extending the service life of the filter bags in the bag filter space, and achieving higher operational stability.

[0025] (5) The purpose of this device in controlling the diversion flow rate to the bag filter space through the spiral hole to be 15% to 35% of the total rotating airflow is to: under the premise of maintaining the stability of the rotating airflow in the cyclone and the centrifugal dust removal efficiency, by diverting an appropriate amount of dust-laden airflow to the bag filter space, significantly suppress dust rebound and wall adhesion, and at the same time avoid excessive diversion leading to the attenuation of centrifugal force in the cyclone section; in addition, this range ensures that the temperature, concentration and flow rate of the airflow entering the bag filter space are within a controllable range, which protects the safety of the filter bag and optimizes the compactness of the equipment, ultimately achieving efficient synergy of two-stage dust removal and minimizing system energy consumption;

[0026] (6) By setting a heat exchange device in the cyclone, the airflow is effectively cooled before entering the bag dust removal space and the subsequent bag dust collector for fine dust removal in this device. This ensures that the airflow temperature entering the bag dust removal space and the subsequent bag dust collector for fine dust removal is within the tolerance range of ordinary filter bags, preventing high temperature damage to filter bags and ensuring the stable operation of each bag dust collector. In this way, ordinary filter bags can be used in each bag dust collector, thereby reducing the enterprise's operating costs. (7) By setting independent cyclone dust collection pipes and bag dust collection pipes, the cyclone-separated dust and bag filter dust can be classified and discharged independently, which facilitates dust treatment and recycling and avoids cross-contamination. Attached Figure Description

[0027] Figure 1 This is a front view of the cyclone and bag filter coupling dust removal device described in Embodiment 1 of this utility model.

[0028] Figure 2 for Figure 1 Top view.

[0029] Figure 3 for Figure 1 The AA section view shown.

[0030] Figure 4 for Figure 1 The BB cross-sectional view shown.

[0031] Figure 5 for Figure 1 The CC section view shown.

[0032] Figure 6 for Figure 1 Front view of the cyclone separator.

[0033] Figure 7 for Figure 6 Rear view.

[0034] Figure 8 This is a front view of the cyclone and bag filter coupling dust removal device described in Embodiment 2 of this utility model.

[0035] Figure 9 for Figure 8 Top view.

[0036] Figure 10 for Figure 8 The DD cross-sectional view shown.

[0037] Figure 11 for Figure 8 The EE cross-sectional view shown.

[0038] Figure 12 for Figure 8 The FF sectional view shown.

[0039] Figure 13 This is a front view of the heat exchange device in Embodiment 2 of this utility model.

[0040] Figure 14 for Figure 13 Top view.

[0041] Figure 15 for Figure 13 The GG cross-sectional view shown.

[0042] Figure 16 for Figure 13 The HH cross-sectional view shown.

[0043] Figure 17 for Figure 9 A schematic diagram of the cylindrical membrane wall structure formed by the cyclone separator and heat exchange tubes.

[0044] Figure 18 for Figure 8 A schematic diagram of the cross-section of the filter bag.

[0045] Figure 19 This is a front view of the cyclone and bag filter coupling dust removal device described in Embodiment 3 of this utility model.

[0046] Figure 20 for Figure 19 Top view.

[0047] Figure 21 for Figure 19 A bottom view.

[0048] Figure 22 for Figure 19 The cross-sectional view of JJ shown.

[0049] Figure 23 for Figure 19 The KK cross-sectional view shown.

[0050] Figure 24 for Figure 19 Front view of the cyclone separator.

[0051] Figure 25 for Figure 24 Rear view.

[0052] Figure 26 This is a front view of the cyclone and bag filter coupling dust removal device described in Embodiment 4 of this utility model.

[0053] Figure 27 for Figure 26 Top view.

[0054] Figure 28 for Figure 26 A bottom view.

[0055] Figure 29 for Figure 26 The MM cross-sectional view shown.

[0056] Figure 30 for Figure 26 The NN cross-sectional view shown.

[0057] Figure 31 This is a front view of the heat exchange device in Embodiment 4 of this utility model.

[0058] Figure 32 for Figure 31 Top view.

[0059] Figure 33 for Figure 31 The PP cross-sectional view shown.

[0060] Figure 34 for Figure 31 The QQ cross-sectional view shown.

[0061] Figure 35 for Figure 27 A schematic diagram of the cylindrical membrane wall structure formed by the cyclone separator and heat exchange tubes.

[0062] Figure 36 for Figure 26 A schematic diagram of the cross-section of the filter bag.

[0063] Figure 37This is a temperature comparison cloud map of the cyclone without spiral holes and the cyclone with spiral holes in Embodiment 2 of this utility model during cyclone dust removal.

[0064] Figure 38 This is a velocity vector comparison cloud diagram of the cyclone without spiral holes and the cyclone with spiral holes in Embodiment 2 of this utility model during cyclone dust removal. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0066] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the structure of the cyclone and bag filter coupled dust collector includes: a shell 1, inside which a tube sheet 2 is provided, dividing the interior of the shell 1 into a clean air chamber 3 on the upper side and a bag filter space 4 on the lower side; a clean air outlet is provided on the side wall of the shell 1 in the clean air chamber 3, and the clean air outlet is connected to a clean air outlet pipe 20; several filter bags 5 extending into the bag filter space 4 are installed on the tube sheet 2, and in this embodiment, the cross-section of the filter bags 5 is circular; several inspection ports corresponding to each filter bag are provided on the top plate 112 of the shell of the clean air chamber 3, and an inspection flange cover 19 that can open or close the inspection port is installed at each inspection port; several bag filter dust discharge ports are provided on the bottom plate 111 of the shell of the bag filter space 4, and a bag dust discharge pipe 6 serving as a dust discharge channel for the bag is connected to each bag dust discharge port; a cyclone is provided in the bag filter space 4. The upper part of the cyclone duct is a cylindrical body 7, and the lower part is a conical body 8. A cyclone top cover 9 is provided on the top of the cylindrical body 7 of the cyclone duct. A cyclone outlet is provided at the center of the cyclone top cover 9. A cyclone outlet pipe 10 is installed at the cyclone outlet. The lower end of the cyclone outlet pipe 10 extends into the cylindrical body 7, and the upper end of the cyclone outlet pipe 10 extends upward from the top plate 112 of the housing 1. At the bottom of the conical body 8 of the cyclone duct, there is a cyclone dust discharge pipe 11, which serves as a cyclone dust removal and ash discharge channel. The cyclone dust discharge pipe 11 is independent of the bag dust discharge pipe 6 and extends downward from the housing 1. In the structure of coupled dust removal of bag dust removal and cyclone dust removal, the use of independent cyclone dust removal and ash discharge channels not only avoids the problem of ash crossing, but also prevents a large number of coarse dust particles separated by cyclone dust removal from entering the bag dust removal space, reducing the probability of the filter bags in the bag dust removal space being blocked by coarse dust particles, and improving the reliability of the device operation.

[0067] A tangential air inlet is provided on the wall of the cylindrical body 7 of the cyclone separator. After the dust-laden airflow enters the cyclone separator through the tangential air inlet, it forms a rotating airflow that spirals downwards along the inner wall surface inside the cyclone separator. The tangential air inlet is connected to a cyclone inlet pipe 12, which extends out of the housing 1. A spiral hole 13, formed along the spiral trajectory of the rotating airflow, is provided on the wall of the cylindrical body 7 of the cyclone separator. The spiral hole 13 penetrates the thickness of the wall of the cylindrical body 7 of the cyclone separator. The internal space of the cyclone separator can be connected to the bag filter space 4 through the spiral hole 13. The number of turns of the spiral hole 13 is consistent with the number of rotations of the rotating airflow within the cylindrical body 7 of the cyclone separator when it moves downward in a spiral motion. The starting position a of the spiral hole matches the starting position of the airflow after entering the cyclone separator from the tangential inlet and beginning its downward spiral motion. The width and number of turns of the spiral hole 13 ensure that the airflow diverted from the spiral hole 13 to the bag filter space 4 is 15% to 35% of the total rotating airflow.

[0068] In this embodiment, the cyclone outlet pipe of the dust removal device extends out of the housing. This structural design allows the dust removal device of this embodiment to be used as a standalone preliminary dust removal device. In practical applications, multiple cyclones of this embodiment 1 can be connected in series with the bag filter dust removal device, that is, the outlet pipe of the cyclone of the previous stage can be connected to the inlet pipe of the cyclone of the next stage, thereby performing multiple preliminary dust removal operations on the dust-laden airflow.

[0069] When fine dust removal is required for dust-laden airflow, for single-stage dust removal devices, the airflow discharged from the cyclone separator of that stage can be directly fed into the bag filter of the subsequent stage to complete the fine dust removal of the airflow; for multi-stage dust removal devices, the airflow discharged from the cyclone separator of the last stage dust removal device can be directly fed into the bag filter of the subsequent stage to complete the fine dust removal of the airflow.

[0070] The dust removal steps of this dust removal device are as follows:

[0071] S1: The dust-laden airflow enters the cyclone tube along the tangential direction through the cyclone inlet pipe 12 and the tangential air inlet in sequence, so that the dust-laden airflow forms a rotating airflow that moves downward in a spiral within the cyclone tube;

[0072] S2: During the cyclone dust removal process using centrifugal force in the spiral downward rotating airflow, 15-35% of the rotating airflow is diverted to the bag filter space 4 through the spiral holes 13 on the wall of the cylindrical body 7 of the cyclone. After being filtered by the filter bags 5 in the bag filter space 4, it enters the clean air chamber 3 and is then discharged through the clean air outlet pipe 20. The remaining rotating airflow is the mainstream airflow. After being cyclone dust removed in the cyclone, the mainstream airflow does not enter the bag filter space 4 into which the diverted airflow flows. Instead, it is discharged directly from the cyclone outlet pipe 10 at the top of the cyclone to the downstream dust removal equipment (such as a bag filter).

[0073] S3: Collect and discharge dust particles separated from the dust-laden airflow after passing through cyclone dust collector and bag filter. The dust particles separated from the dust-laden airflow after passing through the cyclone dust collector and the dust particles filtered by the filter bags in the bag filter space do not share the same ash discharge channel when discharged. The dust particles separated after passing through the cyclone dust collector are discharged through the cyclone dust collection pipe 11, and the dust particles filtered by the filter bags 5 in the bag filter space 4 are discharged through the bag dust collection pipe 6.

[0074] DPM numerical simulation was performed on the cyclone section of this design embodiment. The simulation conditions were: inlet gas velocity 17 m / s, maximum particle diameter 0.67916 mm, minimum particle diameter 0.00199 mm, average particle size 0.023661 mm, particle size assumed to conform to the Rosin-Rammler distribution, particle size distribution 10, simulated gas medium as air, and particle mass content 95 g / Nm³. 3 The inlet temperature is 900°C. Simulation results show that the dust removal efficiency is increased by more than 20% compared with the dust collector without spiral holes. Example 2

[0075] The only difference between the cyclone and bag filter coupling dust removal device in this embodiment 2 and the cyclone and bag filter coupling dust removal device in embodiment 1 is the different cross-sectional shape of the filter bag and the addition of a heat exchange device.

[0076] like Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18As shown, the structure of the cyclone and bag filter coupled dust collector includes: a shell 1, inside which a tube sheet 2 is provided, dividing the interior of the shell 1 into a clean air chamber 3 on the upper side and a bag filter dust collection space 4 on the lower side; a clean air outlet is provided on the side wall of the shell 1 in the clean air chamber 3, and the clean air outlet is connected to a clean air outlet pipe 20; several filter bags 5 extending into the bag filter dust collection space 4 are installed on the tube sheet 2; several inspection ports corresponding to each filter bag are provided on the top plate 112 of the shell of the clean air chamber 3, and an inspection flange cover 19 that can open or close the inspection port is installed at each inspection port; several bag filter dust discharge ports are provided on the bottom plate 111 of the shell of the bag filter dust collection space 4, and a bag dust discharge pipe 6 serving as a dust discharge channel for the bag is connected to each bag dust discharge port; a cyclone separator is provided in the bag filter dust collection space 4, and the upper part of the cyclone separator is a cylindrical body 7. The lower part is a conical body 8. A cyclone top cover 9 is provided at the top of the cylindrical body 7 of the cyclone tube. A cyclone outlet is provided at the center of the cyclone top cover 9. A cyclone outlet pipe 10 is installed at the cyclone outlet. The lower end of the cyclone outlet pipe 10 extends into the cylindrical body 7, and the upper end of the cyclone outlet pipe 10 extends upward from the top plate 112 of the shell and out of the shell 1. At the bottom of the conical body 8 of the cyclone tube, there is a cyclone dust discharge pipe 11, which serves as a cyclone dust removal and ash discharge channel. The cyclone dust discharge pipe 11 is independent of the bag dust discharge pipe 6 and extends downward from the shell 1. In the structure of coupled dust removal of bag dust removal and cyclone dust removal, the use of independent cyclone dust removal and ash discharge channels not only avoids the problem of ash crossing, but also prevents a large number of coarse dust particles separated by cyclone dust removal from entering the bag dust removal space, reducing the probability of the filter bags in the bag dust removal space being blocked by coarse dust particles, and improving the reliability of the device operation.

[0077] A tangential air inlet is provided on the wall of the cylindrical body 7 of the cyclone separator. After the dust-laden airflow enters the cyclone separator through the tangential air inlet, it forms a rotating airflow that spirals downwards along the inner wall surface inside the cyclone separator. The tangential air inlet is connected to a cyclone inlet pipe 12, which extends out of the housing 1. A spiral hole 13, formed along the spiral trajectory of the rotating airflow, is provided on the wall of the cylindrical body 7 of the cyclone separator. The spiral hole 13 penetrates the thickness of the wall of the cylindrical body 7 of the cyclone separator. The internal space of the cyclone separator can be connected to the bag filter space 4 through the spiral hole 13. The number of turns of the spiral hole 13 is consistent with the number of rotations of the rotating airflow within the cylindrical body 7 of the cyclone separator when it moves downward in a spiral motion. The starting position a of the spiral hole matches the starting position of the airflow after entering the cyclone separator from the tangential inlet and beginning its downward spiral motion. The width and number of turns of the spiral hole 13 ensure that the airflow diverted from the spiral hole 13 to the bag filter space 4 is 15% to 35% of the total rotating airflow.

[0078] In this embodiment, each filter bag 5 in the bag filter space 4 is arranged around the cyclone to form at least one ring array. The filter bags 5 have a trapezoidal cross-section, with the shorter base 51 of each filter bag's trapezoidal cross-section close to the cyclone and the longer base 52 away from the cyclone. This filter bag structure and arrangement can maximize the use of the bag filter space, increase the effective dust removal area, and improve dust removal efficiency.

[0079] In this embodiment, a heat exchange device is provided on the cyclone to cool the airflow entering the cyclone. The structure of the heat exchange device includes: a plurality of heat exchange tubes 14, each heat exchange tube 14 being closely spaced along the circumference of the cyclone and in contact with the cylindrical wall 7 of the cyclone. The lower ends of all heat exchange tubes 14 are simultaneously connected to an annular water inlet manifold 15, and a water inlet pipe 16 extending out of the housing 1 is connected to the water inlet manifold 15. The upper ends of the heat exchange tubes 14 are simultaneously connected to an annular water outlet manifold 17, and a water outlet pipe 18 extending out of the housing 1 is connected to the water outlet manifold 17. During the cyclone dust removal process, cooling water is introduced into the water inlet pipe 16 and then distributed to each heat exchange tube 14 by the water inlet pipe 16. During the process, cooling water exchanges heat with the airflow inside the cyclone through the heat exchange tube 14, thereby cooling the high-temperature airflow inside the cyclone. This ensures that the airflow temperature when exiting the cyclone meets the safety design requirements of ordinary filter bags, allowing the device to use both ordinary and heat-resistant filter bags, thus expanding its applicability. In this embodiment, each heat exchange tube 14 and the cylindrical body 7 of the cyclone form a cylindrical membrane wall with a continuous circumferential corrugated inner wall. This cylindrical membrane wall with a continuous circumferential corrugated inner wall not only increases the heat exchange area and is more conducive to the heat exchange and cooling of the airflow, but also further enhances the dust impact and settling effect, improving dust removal efficiency.

[0080] In this embodiment, the cyclone outlet pipe of the dust removal device extends out of the housing. This structural design allows the dust removal device of this embodiment to be used as a standalone preliminary dust removal device. In practical applications, multiple cyclones of this embodiment 1 can be connected in series with the bag filter dust removal device, that is, the outlet pipe of the cyclone of the previous stage can be connected to the inlet pipe of the cyclone of the next stage, thereby performing multiple preliminary dust removal operations on the dust-laden airflow.

[0081] When fine dust removal is required for dust-laden airflow, for single-stage dust removal devices, the airflow discharged from the cyclone separator of that stage can be directly fed into the bag filter of the subsequent stage to complete the fine dust removal of the airflow; for multi-stage dust removal devices, the airflow discharged from the cyclone separator of the last stage dust removal device can be directly fed into the bag filter of the subsequent stage to complete the fine dust removal of the airflow.

[0082] The dust removal steps of this dust removal device are as follows:

[0083] S1: The dust-laden airflow enters the cyclone tube along the tangential direction through the cyclone inlet pipe 12 and the tangential air inlet in sequence, so that the dust-laden airflow forms a rotating airflow that moves downward in a spiral within the cyclone tube;

[0084] S2: During the cyclone dust removal process using centrifugal force in the spiraling downward rotating airflow, the heat exchange device cools the rotating airflow inside the cyclone. At the same time, 15-35% of the rotating airflow is diverted to the bag filter space 4 through the spiral holes 13 on the cylindrical wall of the cyclone 7. Before entering the bag filter space, the temperature of the diverted airflow has been cooled to the tolerance range of ordinary filter bags by the heat exchange device. The diverted airflow entering the bag filter space 4 is filtered by the filter bags 5 and then enters the clean air chamber 3, and is discharged through the clean air outlet pipe 20. The remaining rotating airflow is the mainstream airflow. After all the mainstream airflow has undergone cyclone dust removal in the cyclone, it does not enter the bag filter space 4 into which the diverted airflow flows. Instead, it is all directly discharged from the cyclone outlet pipe 10 at the top of the cyclone to the downstream dust removal equipment. Before the mainstream airflow is discharged from the cyclone outlet pipe 10 at the top of the cyclone to the downstream dust removal equipment, its temperature has been cooled to the tolerance range of ordinary filter bags by the heat exchange device.

[0085] S3: Collect and discharge dust particles separated from the dust-laden airflow after passing through cyclone dust collector and bag filter dust collector. The dust particles separated from the dust-laden airflow after passing through the cyclone dust collector and the dust particles filtered by the filter bags in the bag filter dust collector space do not share the same ash discharge channel when discharged. The dust particles separated after passing through the cyclone dust collector are discharged through the cyclone ash discharge pipe 11, and the dust particles filtered by the filter bags in the bag filter dust collector space 4 are discharged through the bag ash discharge pipe 6.

[0086] DPM numerical simulation was performed on the cyclone body of Example 2 of this design. The simulation conditions were: inlet gas velocity of 17 m / s, maximum particle diameter of 0.67916 mm, minimum particle diameter of 0.00199 mm, average particle size of 0.023661 mm, particle size assumed to conform to the Rosin-Rammler distribution, particle size distribution of 10, simulated gas medium of air, and particle mass content of 95 g / Nm³. 3 The inlet temperature is 900°C. Simulation results show that, compared with the dust collector without spiral holes, the dust removal efficiency is increased by more than 20%, and the outlet temperature is reduced by more than 30%.

[0087] like Figure 37 , Figure 38 As shown, Figure 37 This is a temperature comparison cloud map showing the cyclone separator without spiral holes and the cyclone separator with spiral holes during cyclone dust removal in Embodiment 2 of the present invention. Figure 37(a) in the diagram represents the temperature cloud map of a cyclone separator without spiral holes during cyclone dust removal. Figure 37 (b) in the diagram represents the temperature cloud map of a cyclone separator with spiral holes during cyclone dust removal. Figure 37 It can be seen that for the same air volume, air intake velocity and air intake temperature, the air temperature of the dust-laden airflow after passing through a cyclone separator with spiral holes will be significantly lower than the air temperature of the dust-laden airflow after passing through a cyclone separator without spiral holes.

[0088] Figure 38 This is a velocity vector comparison cloud diagram of a cyclone without spiral holes and a cyclone with spiral holes in cyclone dust removal in Embodiment 2 of the present invention. Figure 38 (c) in the diagram represents the velocity vector cloud diagram of a cyclone separator without spiral holes during cyclone dust removal. Figure 38 In the diagram, (d) represents the velocity vector cloud diagram of a cyclone separator with spiral holes during cyclone dust removal. Figure 38 It can be seen that for the same air volume, air intake velocity and air intake temperature, the air velocity of the dust-laden airflow after passing through a cyclone separator with spiral holes will be significantly lower than that after passing through a cyclone separator without spiral holes. Example 3

[0089] The only difference between the cyclone and bag filter coupled dust collector in this embodiment 3 and the cyclone and bag filter coupled dust collector in embodiment 1 is the position of the outlet of the cyclone outlet pipe of the cyclone tube.

[0090] like Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 , Figure 25As shown, the structure of the cyclone and bag filter coupled dust collector includes: a housing 1, inside which a tube sheet 2 is provided, dividing the interior of the housing 1 into a clean air chamber 3 on the upper side and a bag filter space 4 on the lower side; a clean air outlet is provided on the side wall of the housing 1 in the clean air chamber 3, and the clean air outlet is connected to a clean air outlet pipe 20; several filter bags 5 extending into the bag filter space 4 are installed on the tube sheet 2, and in this embodiment, the cross-section of the filter bags 5 is circular; several inspection ports corresponding to each filter bag are provided on the top plate 112 of the housing in the clean air chamber 3, and an inspection flange cover 19 that can open or close the inspection port is installed at each inspection port; several bag filter dust discharge ports are provided on the bottom plate 111 of the housing in the bag filter space 4, and a bag dust discharge pipe 6 serving as a dust discharge channel for the bag is connected to each bag dust discharge port; a cyclone is provided in the bag filter space 4. The upper part of the cyclone is a cylindrical body 7 and the lower part is a conical body 8. A cyclone top cover 9 is provided on the top of the cylindrical body 7 of the cyclone tube. A cyclone outlet is provided at the center of the cyclone top cover 9. A cyclone outlet pipe 10 is installed at the cyclone outlet. The lower end of the cyclone outlet pipe 10 extends into the cylindrical body 7, and the upper end of the cyclone outlet pipe 10 extends directly into the bag filter space 4. At the bottom of the conical body 8 of the cyclone tube, there is a cyclone dust discharge pipe 11, which serves as a cyclone dust removal ash discharge channel. The cyclone dust discharge pipe 11 is independent of the bag filter dust discharge pipe 6 and extends downward from the shell 1. In the structure of coupled dust removal of bag filter and cyclone dust removal, the use of independent cyclone dust removal ash discharge channels and bag filter dust removal ash discharge channels not only avoids the problem of ash crossing, but also prevents a large number of coarse dust particles separated by cyclone dust removal from entering the bag filter space, reducing the probability of the filter bags in the bag filter space being blocked by coarse dust particles, and improving the reliability of the device operation.

[0091] A tangential air inlet is provided on the wall of the cylindrical body 7 of the cyclone separator. After the dust-laden airflow enters the cyclone separator through the tangential air inlet, it forms a rotating airflow that spirals downwards along the inner wall surface inside the cyclone separator. The tangential air inlet is connected to a cyclone inlet pipe 12, which extends out of the housing 1. A spiral hole 13, formed along the spiral trajectory of the rotating airflow, is provided on the wall of the cylindrical body 7 of the cyclone separator. The spiral hole 13 penetrates the thickness of the wall of the cylindrical body 7 of the cyclone separator. The internal space of the cyclone separator can be connected to the bag filter space 4 through the spiral hole 13. The number of turns of the spiral hole 13 is consistent with the number of rotations of the rotating airflow within the cylindrical body 7 of the cyclone separator when it moves downward in a spiral motion. The starting position a of the spiral hole matches the starting position of the airflow after entering the cyclone separator from the tangential inlet and beginning its downward spiral motion. The width and number of turns of the spiral hole 13 ensure that the airflow diverted from the spiral hole 13 to the bag filter space 4 is 15% to 35% of the total rotating airflow.

[0092] In this embodiment, the cyclone outlet pipe of the dust removal device extends directly into the connected bag filter space. This structural design forms an integrated dust removal structure that combines cyclone dust removal and bag filter in series. This allows the dust removal device in this embodiment to directly complete the preliminary and fine dust removal of the dust-laden airflow without the need for an additional bag filter for fine dust removal.

[0093] The dust removal steps of this dust removal device are as follows:

[0094] S1: The dust-laden airflow enters the cyclone tube along the tangential direction through the cyclone inlet pipe 12 and the tangential air inlet in sequence, so that the dust-laden airflow forms a rotating airflow that moves downward in a spiral within the cyclone tube;

[0095] S2: During the cyclone dust removal process using centrifugal force in the spiral downward rotating airflow, 15-35% of the rotating airflow is diverted to the bag filter space 4 through the spiral holes 13 on the wall of the cylindrical body 7 of the cyclone. After being filtered by the filter bags 5 in the bag filter space 4, it enters the clean air chamber 3 and is then discharged through the clean air outlet pipe 20. The remaining rotating airflow is the mainstream airflow. After being cyclone dust removed in the cyclone, the mainstream airflow is directly discharged from the cyclone outlet pipe 10 at the top of the cyclone into the bag filter space 4 into which the diverted airflow flows. After being filtered by the filter bags 5 in the bag filter space 4, it is directly discharged to the external environment or downstream dust removal equipment.

[0096] S3: Collect and discharge dust particles separated from the dust-laden airflow after passing through cyclone dust collector and bag filter. The dust particles separated from the dust-laden airflow after passing through the cyclone dust collector and the dust particles filtered by the filter bags in the bag filter space do not share the same ash discharge channel when discharged. The dust particles separated after passing through the cyclone dust collector are discharged through the cyclone dust collection pipe 11, and the dust particles filtered by the filter bags 5 in the bag filter space 4 are discharged through the bag dust collection pipe 6.

[0097] DPM numerical simulation was performed on the cyclone body of this design embodiment. The simulation conditions were: inlet gas velocity 17 m / s, maximum particle diameter 0.67916 mm, minimum particle diameter 0.00199 mm, average particle size 0.023661 mm, particle size assumed to conform to the Rosin-Rammler distribution, particle size distribution 10, simulated gas medium as air, and particle mass content 95 g / Nm³. 3 The inlet temperature is 900°C. Simulation results show that, compared with the dust collector without spiral holes, the dust removal efficiency is increased by more than 20%, and the outlet temperature is reduced by more than 30%. Example 4

[0098] The only differences between the cyclone and bag filter coupling dust removal device in Example 4 and the cyclone and bag filter coupling dust removal device in Example 1 are the outlet position of the cyclone outlet pipe of the cyclone tube, the cross-sectional area of ​​the filter bag is trapezoidal, and a heat exchange device is added to the cyclone tube.

[0099] like Figure 26 , Figure 27 , Figure 28 , Figure 29 , Figure 30 , Figure 31 , Figure 32 , Figure 33 , Figure 34 , Figure 35 , Figure 36 As shown, the structure of the cyclone and bag filter coupled dust collector includes: a shell 1, inside which a tube sheet 2 is provided, dividing the interior of the shell 1 into a clean air chamber 3 on the upper side and a bag filter dust collection space 4 on the lower side; a clean air outlet is provided on the side wall of the shell 1 in the clean air chamber 3, and the clean air outlet is connected to a clean air outlet pipe 20; several filter bags 5 extending into the bag filter dust collection space 4 are installed on the tube sheet 2; several inspection ports corresponding to each filter bag are provided on the top plate 112 of the shell of the clean air chamber 3, and an inspection flange cover 19 that can open or close the inspection port is installed at each inspection port; several bag filter dust discharge ports are provided on the bottom plate 111 of the shell of the bag filter dust collection space 4, and a bag dust discharge pipe 6 serving as a dust discharge channel for the bag is connected to each bag dust discharge port; a cyclone separator is provided in the bag filter dust collection space 4, and the upper part of the cyclone separator is cylindrical. 7. The lower part is a conical body 8. A cyclone top cover 9 is provided at the top of the cylindrical body 7 of the cyclone tube. A cyclone outlet is provided at the center of the cyclone top cover 9. A cyclone outlet pipe 10 is installed at the cyclone outlet. The lower end of the cyclone outlet pipe 10 extends into the cylindrical body 7, and the upper end of the cyclone outlet pipe 10 extends directly into the bag filter space 4. At the bottom of the conical body 8 of the cyclone tube, there is a cyclone dust discharge pipe 11, which serves as a cyclone dust removal ash discharge channel. The cyclone dust discharge pipe 11 is independent of the bag filter dust discharge pipe 6 and extends downward from the shell 1. In the structure of coupled dust removal of bag filter and cyclone dust removal, the use of independent cyclone dust removal ash discharge channels and bag filter dust removal ash discharge channels not only avoids the problem of ash crossing, but also prevents a large number of coarse dust particles separated by cyclone dust removal from entering the bag filter space, reducing the probability of the filter bags in the bag filter space being blocked by coarse dust particles, and improving the reliability of the device operation.

[0100] A tangential air inlet is provided on the wall of the cylindrical body 7 of the cyclone separator. After the dust-laden airflow enters the cyclone separator through the tangential air inlet, it forms a rotating airflow that spirals downwards along the inner wall surface inside the cyclone separator. The tangential air inlet is connected to a cyclone inlet pipe 12, which extends out of the housing 1. A spiral hole 13, formed along the spiral trajectory of the rotating airflow, is provided on the wall of the cylindrical body 7 of the cyclone separator. The spiral hole 13 penetrates the thickness of the wall of the cylindrical body 7 of the cyclone separator. The internal space of the cyclone separator can be connected to the bag filter space 4 through the spiral hole 13. The number of turns of the spiral hole 13 is consistent with the number of rotations of the rotating airflow within the cylindrical body 7 of the cyclone separator when it moves downward in a spiral motion. The starting position a of the spiral hole matches the starting position of the airflow after entering the cyclone separator from the tangential inlet and beginning its downward spiral motion. The width and number of turns of the spiral hole 13 ensure that the airflow diverted from the spiral hole 13 to the bag filter space 4 is 15% to 35% of the total rotating airflow.

[0101] In this embodiment, each filter bag 5 in the bag filter space 4 is arranged around the cyclone to form at least one ring array. The filter bags 5 have a trapezoidal cross-section, with the shorter base 51 of each filter bag 5 close to the cyclone and the longer base 52 away from the cyclone. This filter bag structure and arrangement can maximize the use of the bag filter space, increase the effective dust removal area, and improve the dust removal efficiency.

[0102] In this embodiment, a heat exchange device is provided on the cyclone to cool the airflow entering the cyclone. The structure of the heat exchange device includes: a plurality of heat exchange tubes 14, each heat exchange tube 14 being closely spaced along the circumference of the cyclone and in contact with the cylindrical wall 7 of the cyclone. The lower ends of all heat exchange tubes 14 are simultaneously connected to an annular water inlet manifold 15, and a water inlet pipe 16 extending out of the housing 1 is connected to the water inlet manifold 15. The upper ends of the heat exchange tubes 14 are simultaneously connected to an annular water outlet manifold 17, and a water outlet pipe 18 extending out of the housing 1 is connected to the water outlet manifold 17. During the cyclone dust removal process, cooling water is introduced into the water inlet pipe 16 and then distributed to each heat exchange tube 14 by the water inlet pipe 16. During the process, cooling water exchanges heat with the airflow inside the cyclone through the heat exchange tube 14, thereby cooling the high-temperature airflow inside the cyclone. This ensures that the airflow temperature when exiting the cyclone meets the safety design requirements of ordinary filter bags, allowing the device to use both ordinary and heat-resistant filter bags, thus expanding its applicability. In this embodiment, each heat exchange tube 14 and the cylindrical body 7 of the cyclone form a cylindrical membrane wall with a continuous circumferential corrugated inner wall. This cylindrical membrane wall with a continuous circumferential corrugated inner wall not only increases the heat exchange area and is more conducive to the heat exchange and cooling of the airflow, but also further enhances the dust impact and settling effect, improving dust removal efficiency.

[0103] In this embodiment, the cyclone outlet pipe of the dust removal device extends directly into the connected bag filter space. This structural design forms an integrated dust removal structure that combines cyclone dust removal and bag filter in series. This allows the dust removal device in this embodiment to directly complete the preliminary and fine dust removal of the dust-laden airflow without the need for an additional bag filter for fine dust removal.

[0104] The dust removal steps of this dust removal device are as follows:

[0105] S1: The dust-laden airflow enters the cyclone tube along the tangential direction through the cyclone inlet pipe 12 and the tangential air inlet in sequence, so that the dust-laden airflow forms a rotating airflow that moves downward in a spiral within the cyclone tube;

[0106] S2: During the cyclone dust removal process using centrifugal force in the spiraling downward rotating airflow, the heat exchange device cools the rotating airflow inside the cyclone. Simultaneously, 15-35% of the rotating airflow is diverted through the spiral holes 13 on the cylindrical wall of the cyclone 7 to the bag filter space 4. Before entering the bag filter space, the temperature of the diverted airflow has been cooled to within the tolerance range of ordinary filter bags by the heat exchange device. The diverted airflow entering the bag filter space 4 is filtered by filter bags 5 before entering the clean air chamber 3, and then exits through the clean air outlet. After being discharged from the duct 20, the remaining rotating airflow becomes the mainstream airflow. This mainstream airflow undergoes cyclone dust removal within the cyclone tube and is then directly discharged from the cyclone outlet duct 10 at the top of the cyclone tube into the bag filter space 4 into which the diverted airflow flows. Before entering the bag filter space 4, the temperature of this mainstream airflow has been cooled to the tolerance range of ordinary filter bags by the heat exchange device. The mainstream airflow entering the bag filter space 4 is filtered by the filter bags 5 and then enters the clean air chamber 3, before being discharged to the external environment or downstream dust removal equipment through the clean air outlet duct 20.

[0107] S3: Collect and discharge dust particles separated from the dust-laden airflow after passing through cyclone dust collector and bag filter dust collector. The dust particles separated from the dust-laden airflow after passing through the cyclone dust collector and the dust particles filtered by the filter bags in the bag filter dust collector space do not share the same ash discharge channel when discharged. The dust particles separated after passing through the cyclone dust collector are discharged through the cyclone ash discharge pipe 11, and the dust particles filtered by the filter bags in the bag filter dust collector space 4 are discharged through the bag ash discharge pipe 6.

[0108] DPM numerical simulation was performed on the cyclone body of this design embodiment. The simulation conditions were: inlet gas velocity 17 m / s, maximum particle diameter 0.67916 mm, minimum particle diameter 0.00199 mm, average particle size 0.023661 mm, particle size assumed to conform to the Rosin-Rammler distribution, particle size distribution 10, simulated gas medium as air, and particle mass content 95 g / Nm³. 3 The inlet temperature is 900°C. Simulation results show that, compared with the dust collector without spiral holes, the dust removal efficiency is increased by more than 20%, and the outlet temperature is reduced by more than 30%.

[0109] The advantages of this utility model are:

[0110] (1) During the process of cyclone dust removal, the rotating airflow rotates downward in the cyclone tube and is directly guided to the bag filter space through specific spiral holes opened in the cyclone tube wall. Since the dust particles directly guided to the bag filter space will not collide with the inner wall of the cyclone tube, they will not stick to the wall or rebound. This effectively reduces the proportion of dust particles sticking to the cyclone tube wall and rebounding into the inner cyclone. The reduction in the proportion of dust particles rebounding into the inner cyclone improves the dust removal efficiency of the cyclone dust removal itself. The reduction in the number of particles sticking to the wall ensures the operational stability of the cyclone tube.

[0111] (2) The specific trajectory design of the spiral hole is to reduce particle rebound. When the particles move towards the inner wall of the cyclone along the spiral trajectory, if the impact point is located at the spiral hole, the particles can enter the dust collection space of the bag instead of rebounding. The second is to maintain airflow stability. Mismatched openings will disrupt the rotating flow field. The third is to improve the diversion efficiency. Matched opening positions can accurately capture high-concentration particle flow.

[0112] (3) The diversion design significantly reduces the dust particle concentration, velocity and temperature in the mainstream airflow discharged from the top of the cyclone (especially when combined with the heat exchange device for cooling), which reduces the load of bag fine dust removal in the bag dust removal space, avoids the direct scouring of the filter bags in the bag dust removal space by high-speed, high-temperature and high-concentration dust airflow, and significantly extends the service life of the filter bags in the bag dust removal space.

[0113] (4) By adjusting the position of the cyclone outlet, it can adapt to various operating conditions. When the outlet of the cyclone is located outside the shell, this dust removal device can be used as a separate preliminary dust removal device. When handling the same amount of air, the cyclone dust removal efficiency of this dust removal device is better than that of traditional cyclone dust collectors.

[0114] When the outlet of the cyclone separator is located in the bag filter space within the casing, this dust collector is an integrated dust collection structure that connects the cyclone separator and the filter bag in series, enabling fine dust removal of the dust-laden airflow. When handling the same air volume, compared to the traditional integrated dust collection structure where the cyclone dust collector and the bag filter are connected in series through pipelines, this dust collector has a more compact structure, avoiding direct scouring of the filter bags in the bag filter space by high-speed, high-temperature, and high-concentration dust airflow, significantly extending the service life of the filter bags in the bag filter space, and achieving higher operational stability.

[0115] (5) The purpose of this device in controlling the diversion flow rate to the bag filter space through the spiral hole to be 15% to 35% of the total rotating airflow is to: under the premise of maintaining the stability of the rotating airflow in the cyclone and the centrifugal dust removal efficiency, by diverting an appropriate amount of dust-laden airflow to the bag filter space, significantly suppress dust rebound and wall adhesion, and at the same time avoid excessive diversion leading to the attenuation of centrifugal force in the cyclone section; in addition, this range ensures that the temperature, concentration and flow rate of the airflow entering the bag filter space are within a controllable range, which protects the safety of the filter bag and optimizes the compactness of the equipment, ultimately achieving efficient synergy of two-stage dust removal and minimizing system energy consumption;

[0116] (6) By setting a heat exchange device in the cyclone, the airflow is effectively cooled before entering the bag dust removal space and the subsequent bag dust collector for fine dust removal in this device. This ensures that the airflow temperature entering the bag dust removal space and the subsequent bag dust collector for fine dust removal is within the tolerance range of ordinary filter bags, preventing high temperature damage to filter bags and ensuring the stable operation of each bag dust collector. In this way, ordinary filter bags can be used in each bag dust collector, thereby reducing the enterprise's operating costs. (7) By setting independent cyclone dust collection pipes and bag dust collection pipes, the cyclone-separated dust and bag filter dust can be classified and discharged independently, which facilitates dust treatment and recycling and avoids cross-contamination.

Claims

1. A cyclone and bag filter coupled dust collection device, characterized in that: The system includes a housing, inside which a tube sheet divides the interior into an upper clean air chamber and a lower bag filter space. A clean air outlet is located on the housing within the clean air chamber. Several filter bags extending into the bag filter space are installed on the tube sheet. A bag dust discharge pipe, serving as a dust removal channel for the filter bags, is connected to the bottom of the bag filter space. A cyclone separator is installed within the bag filter space; the upper part of the cyclone separator is cylindrical, and the lower part is conical. A cyclone outlet pipe is connected to the top of the cylindrical part of the cyclone separator, extending out of the housing or directly into the bag filter space. A connection is made at the bottom of the conical part of the cyclone separator. The device includes a cyclone dust collection pipe that serves as a dust removal channel for cyclone dust collection. The cyclone dust collection pipe extends downward from the shell. A tangential air inlet is provided on the cylindrical wall of the cyclone tube. After the dust-laden airflow enters the cyclone tube through the tangential air inlet, it forms a rotating airflow that spirals downward along the inner wall of the cyclone tube. The tangential air inlet is connected to a cyclone inlet pipe that extends out of the shell. A spiral hole with a spiral shape is provided on the cylindrical wall of the cyclone tube, which is arranged along the spiral trajectory of the rotating airflow. The spiral hole penetrates the thickness of the cyclone tube wall so that the internal space of the cyclone tube can be connected to the bag filter dust collection space through the spiral hole.

2. The cyclone and bag filter coupled dust collector according to claim 1, characterized in that: The spiral hole is set on the cylindrical wall of the cyclone tube, and the number of spiral holes is consistent with the number of rotations of the rotating airflow within the cylindrical body of the cyclone tube when it moves downwards in a spiral motion.

3. The cyclone and bag filter coupled dust collector according to claim 1, characterized in that: In the bag filter dust collection space, each filter bag is arranged around the cyclone to form at least one ring array. The cross-section of the filter bag is circular or trapezoidal. When the cross-section of the filter bag is trapezoidal, the filter bag is arranged with the shorter base of the trapezoidal cross-section close to the cyclone and the longer base away from the cyclone.

4. The cyclone and bag filter coupled dust collector according to claim 1, characterized in that: The cyclone dust collection pipe is set up independently of the bag dust collection pipe, and the cyclone dust collection pipe and the bag dust collection pipe do not share the ash discharge channel.

5. The cyclone and bag filter coupled dust collector according to claim 1, 2, 3, or 4, characterized in that: A heat exchange device is installed on the cyclone to cool down the airflow inside the cyclone.

6. The cyclone and bag filter coupled dust collector according to claim 5, characterized in that: The structure of the heat exchange device includes: several heat exchange tubes, each heat exchange tube is arranged closely in contact with the cyclone cylinder wall at intervals along the circumference of the cyclone cylinder, one end of all heat exchange tubes is connected to an annular water inlet header, and a water inlet pipe extending out of the shell is connected to the water inlet header, and the other end of the heat exchange tubes is connected to an annular water outlet header, and a water outlet pipe extending out of the shell is connected to the water outlet header.

7. The cyclone and bag filter coupled dust collector according to claim 6, characterized in that: Each heat exchange tube and the cyclone tube form a cylindrical membrane wall with a continuous circumferential corrugated structure on the inner wall surface.

Images