Bag dust collector and dust cleaning method

Abstract

A bag filter and a dust cleaning method, comprising a housing (10), a filter element and a dust cleaning device (50), wherein the housing (10) is further provided with a heat preservation device (60), the filter element comprising a filter bag frame (20) and a dust filter bag (30) coated on the outside of the filter bag frame (20), the heat preservation device (60) being configured to maintain the filter bag frame (20) at a set temperature, so that the surface temperature of the dust filter bag (30) is higher than the lowest temperature of air condensation, the filter bag frame (20) can be heated to the set temperature by the heat preservation device (60), and the heated filter bag frame (20) is used to radiate heat to the dust filter bag (30), so that the surface temperature of the dust filter bag (30) is higher than the lowest temperature of air condensation, thereby avoiding the phenomenon of dust sticking to the filter bag due to air condensation.

Description

Technical Field

[0001] The invention belongs to the technical field of bag dust collectors, and in particular relates to a bag dust collector and a dust cleaning method. Background Art

[0002] The main function of a bag dust collector is to filter and remove dust and particulate matter from the air. The air is filtered through the fiber structure of the filter bag, and the dust is intercepted on the surface of the bag, thereby discharging clean air. Especially in the steel, chemical, cement and other industries, bag dust collectors can efficiently remove these dust and exhaust gases to meet environmental protection requirements.

[0003] Condensation in bag dust collectors is a common problem that may be encountered during operation. After condensation occurs, it combines with dust particles in the dust collector and adheres to the surface of the filter bags, causing the bags to become stuck and cannot be effectively removed by the online cleaning system. Currently, it is necessary to shut down the machine and use a special air pressure device to release compressed gas with higher pressure to the filter bags, or remove the bags for cleaning, etc. to remove the dust stuck in the bags. The above methods all require shutdown, which delays the continuity of production. Therefore, there is an urgent need for a bag dust collector that can remove the dust stuck in the bags online. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a bag dust collector and a dust cleaning method to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted is as follows: In a first aspect of an embodiment of the present invention, a bag dust collector is proposed, comprising:

[0006] A box body, in which a partition is fixedly provided, and a first chamber and a second chamber are separated by the partition, and the box body is provided with an air inlet pipe communicating with the first chamber, and an exhaust pipe communicating with the second chamber;

[0007] A plurality of filter elements, which are cylinders with one end open, are arranged in a matrix and mounted on the partition plate, with the open end facing the second chamber;

[0008] A dust cleaning device, fixedly mounted on the box body and configured to spray a pulsed airflow toward the filter element;

[0009] In which, the box body is also provided with an insulation device, the filter element includes a filter bag frame and a dust filter bag coated on the outside of the filter bag frame, and the insulation device is configured to maintain the filter bag frame at a set temperature so that the temperature of the surface of the dust filter bag is higher than the condensation temperature.

[0010] Furthermore, the filter bag skeleton comprises:

[0011] A mounting ring seat, which is arranged in a ring shape and can be clamped and fixed on the partition;

[0012] A plurality of support frames are centrally symmetrically distributed on the mounting ring seat and extend toward the first chamber to form a cylindrical frame;

[0013] A venturi tube, fixedly arranged on the inner side of the mounting ring seat;

[0014] The cross section of the support frame is set to be circular or fan-shaped, and a plurality of guide plates protruding inward are provided on the inner side wall of the support frame along the length direction, and the angle between the guide plate and the axis of the mounting ring seat is set at 30°~45°.

[0015] Furthermore, the heat preservation device includes an electric heating device, the filter bag skeleton includes an alloy skeleton, and the filter bag skeleton is configured to be electrically connected to the heat preservation device and can be heated to a set temperature by the heat preservation device.

[0016] Further, two pipe joints are fixedly provided on the mounting ring seat, the support frame includes an equal number of water inlet pipe racks and water outlet pipe racks that are interconnected, the water inlet pipe racks and the water outlet pipe racks are respectively connected to the two pipe joints, the heat preservation device includes a water inlet pipe and a drain pipe, one end of the water inlet pipe is connected to an external pumping device, and the other end is connected to the water inlet pipe rack and the pipe joint, one end of the drain pipe is connected to an external pumping device, and the other end is connected to the water outlet pipe rack and the pipe joint;

[0017] The water inlet pipe rack and the water outlet pipe rack are both provided with a tube cavity, and the water inlet pipe and the water discharge pipe are both connected to the tube cavity and are used to transport a liquid medium of a set temperature into the support frame, so that the filter bag skeleton can be heated to the set temperature by the insulation device.

[0018] Furthermore, a guide device is installed inside the filter bag frame, and the guide device includes:

[0019] A linear actuator is arranged at the axis position of the mounting ring seat;

[0020] A guide platform, mounted on the linear actuator and capable of being driven by the linear actuator to move along the axis of the mounting ring seat;

[0021] Wherein, a guide wedge surface is provided on the side of the guide platform facing the mounting ring seat, and the guide wedge surface is configured to guide the airflow flowing along the axial direction of the mounting ring seat to the inner wall of the dust filter bag in a direction perpendicular to the axial direction, and the linear actuator adjusts the position of the guide platform to adjust the area where the pulse airflow acts on the dust filter bag.

[0022] Furthermore, the guide device also includes a track frame, the track frame ring portion is on the peripheral side of the linear actuator, and a track groove is opened on the guide platform corresponding to the track frame, so that the guide platform can slide along the track frame in the axial direction.

[0023] Furthermore, a hollow flow guiding cavity is provided in the surface wall of the venturi tube, and the hollow flow guiding cavity is configured to communicate with the pipe joint;

[0024] A guide groove is provided inside the track frame, the guide groove is connected to the guide cavity, the water inlet pipe and the drain pipe are both connected to the guide cavity and are used to transport a liquid medium of a set temperature into the track frame, so that the track frame can be heated to the set temperature by the insulation device.

[0025] Furthermore, the dust cleaning device comprises:

[0026] A compressed air tank, the input end of which is connected to an external air compressor;

[0027] A blowing pipe is arranged at the output end of the compressed air tank and extends into the second chamber, and a nozzle is arranged on the opening side corresponding to each of the filter elements;

[0028] The pulse valve is arranged at the connection between the output end of the compressed air tank and the blowing pipe, and is used to control the on-off of the air path of the blowing pipe.

[0029] Furthermore, an ash hopper is fixedly provided at the bottom of the box body, an ash discharge channel is fixedly provided at the bottom end of the ash hopper, a valve plate is installed in the ash discharge channel, and an ash discharge valve for controlling the opening and closing of the valve plate is fixedly provided on the outer wall of the ash discharge channel.

[0030] A second aspect of an embodiment of the present invention provides a dust cleaning method for a bag dust collector, using the above-mentioned bag dust collector, comprising the following steps:

[0031] Preheating: The liquid medium extracted from the water inlet pipe is pumped into the filter bag frame through the water inlet pipe by the pumping device, and then drawn out from the drain pipe, so that the filter bag frame is heated to a set temperature, and the surface temperature of the dust filter bag is higher than the lowest temperature of air condensation;

[0032] Cleaning: including the first cleaning method and the second cleaning method. When the pressure difference between the inlet and outlet of the dust collector reaches a set value or the time reaches a set period, the pulse valve opens to transport the compressed air in the compressed air tank to the blowing pipe and discharge it into the dust filter bag through the nozzle, so that the dust filter bag expands axially to generate impact vibration to shake off the dust;

[0033] The first dust cleaning method is configured such that the guide platform is located at the bottom end of the dust filter bag;

[0034] The second dust cleaning mode is configured such that each time exhaust is performed, the guide platform is cyclically located at N positions in the dust filter bag from high to low, wherein N is a natural number greater than 2;

[0035] When the cleaning cycle is in a normal range, the first cleaning method is executed, and when the frequency of the cleaning cycle increases, the second cleaning method is executed.

[0036] The beneficial effects achieved by the present invention using the above structure are as follows:

[0037] The filter bag frame in the present invention can be heated to a set temperature by the insulation device, and the heated filter bag frame is used to radiate heat to the dust filter bag, so that the surface temperature of the dust filter bag is higher than the lowest temperature of air condensation, thereby avoiding the phenomenon of dust sticking to the bag due to air condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the three-dimensional structure of a bag filter proposed in an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the internal structure of a bag filter proposed in an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the internal structure of a filter bag skeleton is provided for an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the three-dimensional structure of a filter bag skeleton is provided for an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the installation structure of a guide platform on a linear actuator is provided for an embodiment of the present invention;

[0043] Figure 6 A partial half-section schematic diagram of a filter bag skeleton is provided for an embodiment of the present invention.

[0044] Among them, 10, box body; 101, first chamber; 102, second chamber; 11, ash hopper; 111, ash discharge channel; 12, ash discharge valve; 121, valve plate; 13, air inlet pipe; 14, exhaust pipe; 15, partition; 20, filter bag frame; 21, mounting ring seat; 211, pipe joint; 22, support frame; 22a, water inlet pipe frame; 22b, water outlet pipe frame; 220, pipe cavity; 221, guide plate; 23. Venturi tube; 30. Dust filter bag; 40. Guide device; 41. Linear actuator; 411. Driver; 42. Guide platform; 420. Track groove; 421. Guide wedge surface; 43. Track frame; 50. Cleaning device; 51. Compressed air tank; 52. Blowing pipe; 521. Nozzle; 53. Pulse valve; 60. Insulation device; 61. Water inlet pipe; 62. Drain pipe; 63. Temperature sensor.

[0045] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0047] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0048] like Figure 1 and Figure 2 As shown, in a first aspect of an embodiment of the present invention, a bag dust collector is provided, which aims to solve the problem of dust condensation and bag sticking in the dust collector and the problem of cleaning the dust stuck on the surface of the bags, especially for the treatment of hygroscopic dust in cement manufacturing, metallurgy, ore, chemical industry, etc. These dusts easily absorb moisture in the air during the treatment process to form condensation. The dust collector includes a box body 10, multiple groups of filter elements and a cleaning device 50.

[0049] Among them, a partition 15 is fixedly provided inside the box body 10, and a first chamber 101 (dirty air chamber) and a second chamber 102 (clean air chamber) are separated by the partition 15. An air inlet pipe 13 connected to the first chamber 101 is provided on the box body 10. The air inlet pipe 13 is connected to the external sewage air pipe, and an exhaust pipe 14 connected to the second chamber 102 is provided. Multiple groups of filter elements are cylindrical bodies with one end open, which are arranged in a matrix on the partition 15, and the open end faces the second chamber 102.

[0050] In some embodiments, a plurality of holes for installing filter elements are pre-set on the partition 15, and the filter element opening faces the second chamber 102. The filter element is placed in the first chamber 101 as a whole and installed on the partition 15 and fixed. In this way, the dust-containing gas in the first chamber 101 is filtered by the filter element and then discharged from the second chamber 102, thereby removing the dust in the gas.

[0051] Furthermore, the dust cleaning device 50 is fixedly disposed on the housing 10 and is configured to spray pulse airflow toward the filter element to clean dust on the surface of the filter element.

[0052] In some embodiments, the cleaning device 50 includes: a compressed air tank 51, a blow pipe 52 and a pulse valve 53. The compressed air tank 51 is fixed on the outer wall of the box body 10. The input end of the compressed air tank 51 is connected to an external air compressor. The air compressor can input gas into the compressed air tank 51 so that high-pressure gas is stored in the compressed air tank 51. The blow pipe 52 is arranged at the output end of the compressed air tank 51 and extends into the second chamber 102. A nozzle 521 is provided on the opening side corresponding to each filter element. The pulse valve 53 is arranged at the connection between the output end of the compressed air tank 51 and the blow pipe 52, and is used to control the on-off of the air path of the blow pipe 52.

[0053] Among them, the pulse valve 53 is connected to the external control system, and the opening and closing of the pulse valve 53 is controlled by the control system. When the pressure difference between the inlet and outlet of the dust collector reaches the set value or the time reaches the set period, the control system controls the pulse valve 53 to open, and the compressed air in the compressed air tank 51 is transported to the blowing pipe 52, and discharged into the filter element through the nozzle 521 for cleaning.

[0054] Furthermore, an ash hopper 11 is fixedly provided at the bottom of the box body 10, an ash discharge channel 111 is fixedly provided at the bottom end of the ash hopper 11, a valve plate 121 is installed in the ash discharge channel 111, and an ash discharge valve 12 for controlling the opening and closing of the valve plate 121 is fixedly provided on the outer wall of the ash discharge channel 111. The ash discharge valve 12 is connected to the control system, and the ash discharge valve 12 is controlled by the control system to drive the opening and closing of the valve plate 121.

[0055] Furthermore, the box body 10 is also provided with a heat preservation device 60, the filter element includes a filter bag frame 20 and a dust filter bag 30 coated on the outside of the filter bag frame 20, and the heat preservation device 60 is configured to maintain the filter bag frame 20 at a set temperature (35°C~45°C) so that the surface temperature of the dust filter bag 30 is higher than the condensation temperature (25°C~35°C).

[0056] In some embodiments, the insulation device 60 includes an electric heating device, the filter bag frame 20 includes an alloy frame, the filter bag frame 20 is configured to be electrically connected to the insulation device 60, and can be heated to a set temperature by the insulation device 60. Generally, the insulation device 60 adopts an electric heating device with a temperature controller, and the filter bag frame 20 is heated as a resistor. The temperature controller can accurately control the temperature of the filter bag frame 20, and use the heated filter bag frame 20 to radiate heat to the dust filter bag 30, so that the temperature of the surface of the dust filter bag 30 is higher than the lowest temperature of air condensation, thereby avoiding the phenomenon of dust sticking to the bag due to air condensation.

[0057] Generally, in order to reduce energy consumption, the insulation device 60 is in a shutdown state, and a temperature sensor is arranged inside the dust collector. When the temperature of the dust-laden gas is higher than the condensation temperature, the insulation device 60 does not start; when the temperature of the dust-laden gas is lower than the condensation temperature, the insulation device 60 starts, so that the temperature near the dust filter bag 30 is higher than the condensation temperature, thereby preventing dust from sticking to the surface of the dust filter bag 30.

[0058] like Figure 3 and Figure 4 As shown, the filter bag skeleton 20 includes a mounting ring seat 21, a support frame 22 and a venturi tube 23. The mounting ring seat 21 is arranged in a ring shape and can be fixed in a hole on the partition 15. A plurality of support frames 22 are distributed on the mounting ring seat 21 in a centrally symmetrical manner and extend toward the first chamber 101 to form a cylindrical skeleton. The venturi tube 23 is fixedly arranged on the inner side of the mounting ring seat 21, wherein the support frame 22 with a cylindrical structure can provide a stable support for the outer dust filter bag 30 and maintain the shape of the dust filter bag 30. The venturi tube 23 is arranged on the air inlet side of the pulse airflow to induce air to enter the dust filter bag 30, reduce the resistance of air flow, and accelerate the flow speed of the airflow.

[0059] In some embodiments, Figure 6As shown, the cross-section of the support frame 22 is set to be circular or fan-shaped, and a plurality of guide plates 221 protruding inward are provided on the inner side wall of the support frame 22 along the length direction. The angle between the guide plate 221 and the axis of the mounting ring seat 21 is set at 30°~45°. When the pulse airflow flows from the inlet direction along the axial direction to the bottom of the dust filter bag 30, it will pass through a plurality of guide plates 221 in sequence. The guide plates 221 can guide the airflow in the radial direction, so that the airflow radially impacts the inner wall of the dust filter bag 30, forcing the dust filter bag 30 to expand radially outward, thereby strengthening the impact on the side of the dust filter bag 30, and causing the dust filter bag 30 to expand and vibrate in both the axial and radial directions, thereby promoting the shaking off of dust on the surface.

[0060] like Figure 2 and Figure 4 As shown, two pipe joints 211 are fixedly provided on the mounting ring seat 21, the support frame 22 includes an equal number of water inlet pipe racks 22a and water outlet pipe racks 22b which are interconnected, the water inlet pipe racks 22a and the water outlet pipe racks 22b are respectively connected to the two pipe joints 211, the insulation device 60 includes a water inlet pipe 61 and a drain pipe 62, one end of the water inlet pipe 61 is connected to an external pumping device, and the other end is connected to the water inlet pipe rack 22a and the pipe joint 211, one end of the drain pipe 62 is connected to an external pumping device, and the other end is connected to the water outlet pipe rack 22b and the pipe joint 211.

[0061] Among them, a tube cavity 220 is provided in the water inlet pipe rack 22a and the water outlet pipe rack 22b. The water inlet pipe 61 and the drainage pipe 62 are connected to the tube cavity 220 and are used to transport liquid medium of a set temperature into the support frame 22, so that the filter bag frame 20 can be heated to the set temperature by the insulation device 60.

[0062] The external liquid pumping device can pump the liquid medium of the set temperature into the support frame 22 through the water inlet pipe 61, and the external liquid extraction device extracts the liquid medium through the drain pipe 62. In this way, the liquid of the set temperature is pumped into the support frame 22 in a cycle, so that the liquid passes through the water inlet pipe rack 22a and the water outlet pipe rack 22b in turn to heat the support frame 22, so that the filter bag frame 20 can be heated to the set temperature by the insulation device 60, and the heated filter bag frame 20 is used to radiate heat to the dust filter bag 30, so that the surface temperature of the dust filter bag 30 is higher than the lowest temperature of air condensation, thereby avoiding the phenomenon of dust sticking to the bag due to air condensation.

[0063] Furthermore, a temperature sensor 63 is also provided on the pump liquid pipeline, which can accurately feedback the temperature of the liquid medium to facilitate accurate adjustment of the medium temperature. Generally, the liquid medium uses heat transfer oil or softened water. Compared with the electric heating method, the hot water circulation method can more accurately control the temperature of the filter bag frame 20, thereby avoiding excessive temperature affecting the service life and dust filtering performance of the dust filter bag 30.

[0064] like Figure 4and Figure 5 As shown, in order to enable the high-pressure airflow ejected from the nozzle 521 to be radially sprayed toward the inner wall of the dust filter bag 30 at a set position, a guide device 40 is installed inside the filter bag frame 20. The guide device 40 includes a linear actuator 41 and a guide platform 42. The linear actuator 41 is set at the axial position of the mounting ring seat 21, and the guide platform 42 is installed on the linear actuator 41 and can be driven by the linear actuator 41 to move along the axis of the mounting ring seat 21.

[0065] Among them, a guide wedge surface 421 is provided on the side of the guide platform 42 facing the mounting ring seat 21, and the guide wedge surface 421 is configured to guide the airflow flowing along the axial direction of the mounting ring seat 21 to the inner wall of the dust filter bag 30 in a direction perpendicular to the axial direction. The linear actuator 41 adjusts the position of the guide platform 42 to adjust the area where the pulse airflow acts on the dust filter bag 30.

[0066] In some embodiments, the linear actuator 41 is an electric actuator, and a driver 411 is set at the bottom end of the linear actuator 41. The driver 411 uses a stepping motor and can accurately control the position of the guide platform 42 on the linear actuator 41. According to the position height of the guide platform 42 in the dust filter bag 30, the position area where the pulse airflow acts on the inner wall of the dust filter bag 30 can be adjusted, so as to remove the dust attached to the surface of the dust filter bag 30 in a targeted manner. In particular, the shorter the distance between the guide platform 42 and the air jet port, the greater the pressure of the high-pressure gas on the dust filter bag 30, and it is easier to shake off the bag-sticking gas on the surface of the dust filter bag 30.

[0067] Furthermore, the guide device 40 also includes a track frame 43, the ring portion of the track frame 43 is on the peripheral side of the linear actuator 41, and a track groove 420 is opened on the guide platform 42 corresponding to the track frame 43, so that the guide platform 42 can slide along the track frame 43 in the axial direction. The setting of the track frame 43 can make the movement of the guide platform 42 more stable.

[0068] Furthermore, a hollow guide cavity is provided in the surface wall of the venturi tube 23, and the hollow guide cavity is configured to be connected to the pipe joint 211. A guide groove is provided inside the track frame 43, and the guide groove is connected to the guide cavity. The water inlet pipe 61 and the drain pipe 62 are both connected to the guide cavity and are used to transport a liquid medium of a set temperature into the track frame 43, so that the track frame 43 can be heated to the set temperature by the insulation device 60.

[0069] After the compressed gas is released, its pressure and temperature usually decrease, and the gas acts on the surface of the dust filter bag 30, which may cause condensation in the surrounding air, thereby causing dust and water droplets to combine and stick to the surface of the dust filter bag 30. Heating the track frame 43 can avoid condensation caused by the diffusion process of the compressed gas, thereby making it easier for the gas to remove dust from the surface of the dust filter bag 30.

[0070] A second aspect of an embodiment of the present invention provides a dust cleaning method for a bag dust collector, using the above-mentioned bag dust collector, comprising the following steps:

[0071] Preheating: The liquid medium extracted from the water inlet pipe 61 is pumped into the filter bag frame 20 through the water inlet pipe 61 by the pumping device, and is pumped out from the drain pipe 62, so that the filter bag frame 20 is heated to a set temperature, and the surface temperature of the dust filter bag 30 is higher than the lowest temperature of air condensation. The external pumping device can pump the liquid medium of the set temperature into the support frame 22 through the water inlet pipe 61, and the external pumping device pumps the liquid medium out through the drain pipe 62. In this way, the liquid of the set temperature is pumped into the support frame 22 in a cycle, so that the liquid passes through the water inlet pipe frame 22a and the water outlet pipe frame 22b in turn to heat the support frame 22, so that the filter bag frame 20 can be heated to a set temperature by the insulation device 60, and the heated filter bag frame 20 is used to radiate heat to the dust filter bag 30, so that the surface temperature of the dust filter bag 30 is higher than the lowest temperature of air condensation, thereby avoiding the phenomenon of dust sticking to the bag due to air condensation.

[0072] Cleaning: including the first cleaning method and the second cleaning method. When the pressure difference between the inlet and outlet of the dust collector reaches the set value or the time reaches the set period, the pulse valve 53 opens, and the compressed air in the compressed air tank 51 is transported to the blowing pipe 52, and discharged into the dust filter bag 30 through the nozzle 521, so that the dust filter bag 30 expands axially to generate impact vibration to shake off the dust;

[0073] The first dust cleaning method is configured such that the guide platform 42 is located at the bottom end of the dust filter bag 30;

[0074] The second dust cleaning mode is configured such that each time exhaust is performed, the guide platform 42 is cyclically located at N positions in the dust filter bag 30 from high to low, wherein N is a natural number greater than 2;

[0075] In this way, when the cleaning cycle is in the normal range, that is, when there is no bag sticking phenomenon, the first cleaning method is executed to shake off the dust on the surface of the dust filter bag 30.

[0076] When the frequency of the cleaning cycle increases, it indicates that the surface of the dust filter bag 30 may be sticky, and the second cleaning method is executed. In the second cleaning method, the compressed gas not only expands axially in the dust filter bag 30 to generate impact vibration to shake off the dust, but also expands radially in the dust filter bag 30 to generate impact vibration to shake off the dust. In particular, the shorter the distance between the guide platform 42 and the air jet port, the greater the pressure of the high-pressure gas on the dust filter bag 30, and it is easier to shake off the bag-sticking gas on the surface of the dust filter bag 30.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the embodiments is defined by the appended claims and their equivalents.

[0079] The above description of the implementation mode is not restrictive. The figure shown in the drawings is only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A bag dust collector, characterized in that: include: A box body (10) having a partition (15) fixedly provided therein, and a first chamber (101) and a second chamber (102) separated by the partition (15); the box body (10) having an air intake pipe (13) in communication with the first chamber (101) and an air exhaust pipe (14) in communication with the second chamber (102); A plurality of filter elements, which are cylindrical bodies with one end open, are arranged in a matrix and mounted on the partition plate (15), with the open end facing the second chamber (102); A dust cleaning device (50) fixedly mounted on the box body (10) and configured to spray a pulsed airflow toward the filter element; The box body (10) is further provided with a heat preservation device (60), the filter element comprises a filter bag frame (20) and a dust filter bag (30) wrapped around the outside of the filter bag frame (20), and the heat preservation device (60) is configured to maintain the filter bag frame (20) at a set temperature so that the surface temperature of the dust filter bag (30) is higher than the condensation temperature; The filter bag frame (20) comprises a mounting ring seat (21), and a guide device (40) is installed inside the filter bag frame (20). The guide device (40) comprises: A linear actuator (41) is arranged at an axial position of the mounting ring seat (21); A guide platform (42) mounted on the linear actuator (41) and capable of being driven by the linear actuator (41) to move along the axis of the mounting ring seat (21); The guide platform (42) is provided with a guide wedge surface (421) on a side facing the mounting ring seat (21), and the guide wedge surface (421) is configured to guide the airflow flowing along the axial direction of the mounting ring seat (21) to the inner wall of the dust filter bag (30) in a direction perpendicular to the axial direction, and the linear actuator (41) adjusts the position of the guide platform (42) to adjust the area where the pulsed airflow acts on the dust filter bag (30).

2. The bag filter according to claim 1, characterized in that: The mounting ring seat (21) is arranged in a ring shape and can be clamped and fixed on the partition plate (15). The filter bag frame (20) further comprises: A plurality of support frames (22) are centrally symmetrically distributed on the mounting ring seat (21) and extend toward the first chamber (101) to form a cylindrical frame; A venturi tube (23) fixedly arranged on the inner side of the mounting ring seat (21); The cross section of the support frame (22) is arranged to be circular or fan-shaped, a plurality of guide plates (221) protruding inwardly are arranged on the inner side wall of the support frame (22) along the length direction, and the angle between the guide plates (221) and the axis of the mounting ring seat (21) is arranged to be 30° to 45°.

3. The bag filter according to claim 2, characterized in that: The heat preservation device (60) comprises an electric heating device, the filter bag frame (20) comprises an alloy frame, and the filter bag frame (20) is configured to be electrically connected to the heat preservation device (60) and can be heated to a set temperature by the heat preservation device (60).

4. The bag filter according to claim 2, characterized in that: Two pipe joints (211) are fixedly provided on the mounting ring seat (21); the support frame (22) comprises an equal number of water inlet pipe racks (22a) and water outlet pipe racks (22b) which are interconnected; the water inlet pipe racks (22a) and the water outlet pipe racks (22b) are respectively connected to the two pipe joints (211); the heat preservation device (60) comprises a water inlet pipe (61) and a drainage pipe (62); one end of the water inlet pipe (61) is connected to an external liquid pumping device, and the other end is connected to the water inlet pipe rack (22a) and the pipe joint (211); one end of the drainage pipe (62) is connected to an external liquid pumping device, and the other end is connected to the water outlet pipe rack (22b) and the pipe joint (211); The water inlet pipe rack (22a) and the water outlet pipe rack (22b) are both provided with a tube cavity (220); the water inlet pipe (61) and the water outlet pipe (62) are both in communication with the tube cavity (220) and are used to transport a liquid medium of a set temperature into the support rack (22), so that the filter bag skeleton (20) can be heated to the set temperature by the heat preservation device (60).

5. The bag filter according to claim 4, characterized in that: The guide device (40) further comprises a track frame (43), the ring portion of the track frame (43) being arranged on the peripheral side of the linear actuator (41), and a track groove (420) being provided on the guide platform (42) at a position corresponding to the track frame (43), so that the guide platform (42) can slide along the track frame (43) in an axial direction.

6. The bag filter according to claim 5, characterized in that: A hollow flow guiding cavity is provided in the surface wall of the venturi tube (23), and the hollow flow guiding cavity is configured to communicate with the pipe joint (211); A guide groove is provided inside the track frame (43), the guide groove is in communication with the guide cavity, the water inlet pipe (61) and the drain pipe (62) are both in communication with the guide cavity and are used to transport a liquid medium of a set temperature into the track frame (43), so that the track frame (43) can be heated to the set temperature by the heat preservation device (60).

7. The bag filter according to claim 6, characterized in that: The dust cleaning device (50) comprises: A compressed air tank (51), an input end of which is connected to an external air compressor; A blowing pipe (52) is arranged at the output end of the compressed air tank (51) and extends into the second chamber (102), and a nozzle (521) is provided corresponding to the opening side of each filter element; A pulse valve (53) is provided at the connection between the output end of the compressed air tank (51) and the blowing pipe (52), and is used to control the on-off of the air path of the blowing pipe (52).

8. The bag filter according to claim 1, characterized in that: An ash hopper (11) is fixedly provided at the bottom of the box body (10), an ash discharge channel (111) is fixedly provided at the bottom end of the ash hopper (11), a valve plate (121) is installed in the ash discharge channel (111), and an ash discharge valve (12) for controlling the opening and closing of the valve plate (121) is fixedly provided on the outer wall of the ash discharge channel (111).

9. A dust cleaning method for a bag filter, characterized in that: Using the bag dust collector described in claim 7, The following steps are involved: Preheating: the liquid medium extracted from the water inlet pipe (61) is pumped into the filter bag frame (20) through the water inlet pipe (61) by the external liquid pumping device and is pumped out from the drain pipe (62), so that the filter bag frame (20) is heated to a set temperature, and the surface temperature of the dust removal filter bag (30) is higher than the air condensation temperature; Cleaning: including a first cleaning method and a second cleaning method. When the pressure difference between the inlet and outlet of the dust collector reaches a set value or the time reaches a set period, the pulse valve (53) is opened to transport the compressed air in the compressed air tank (51) into the blowing pipe (52) and discharge it into the dust filter bag (30) through the nozzle (521), so that the dust filter bag (30) expands axially to generate impact vibration to shake off dust; The first dust cleaning method is configured such that the guide platform (42) is located at the bottom end of the dust removal filter bag (30); The second dust cleaning method is configured such that each time exhaust is performed, the guide platform (42) is cyclically located at N positions in the dust filter bag (30) from high to low, wherein N is a natural number greater than 2; When the cleaning cycle is in a normal range, the first cleaning method is executed, and when the frequency of the cleaning cycle increases, the second cleaning method is executed.

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