JP7455883B2 - Filter cloth cleaning device, cleaning system and cleaning method - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Publication name and electronic version address: Monthly Denki Genba January 2022 issue, https://denkigenba. jp/denkigenba/DG202201, release date: January 2020

The present invention relates to a filter cloth cleaning device, a cleaning system, and a cleaning method.

Bag filters are used to collect dust in the exhaust gas discharged from the boilers of thermal power plants. When a thermal power plant continues to operate, the cylindrical filter cloth provided in the bag filter becomes clogged with dust, and the filter cloth needs to be replaced. Since filter cloths are costly to replace, attempts have been made to extend their lifespan. For example, Patent Document 1 discloses that by injecting air from a pair of injection holes provided in the outer cylinder while it is inserted inside the filter cloth, the outer cylinder is rotated around its axis by the reaction of the injection. A cleaning device for brushing off dust attached to a filter cloth is disclosed.

Japanese Patent Application Publication No. 2005-125293

In the cleaning device of Patent Document 1, injection holes are provided in the peripheral walls of the inner cylinder and the outer cylinder, and air is injected to the outside at the timing when the injection holes match. For this reason, there is a problem in that the force of the air jet is significantly reduced due to the pressure loss in the flow path, and the dust adhering to the cylindrical filter cloth cannot be sufficiently brushed off.

The present invention was made based on this background, and an object of the present invention is to provide a cleaning device, a cleaning system, and a cleaning method that can sufficiently remove dust from a cylindrical filter cloth.

In order to achieve the above object, the cleaning device according to the present invention includes:
A cleaning device that can be inserted into a cylindrical filter cloth provided in a bag filter,
a cylindrical member through which air can flow;
Rotation that is arranged on the tip side of the cylindrical member, is rotatably supported around an axis with respect to the cylindrical member, and that air is supplied to the internal space from an opening provided on the tip surface of the cylindrical member. parts and
Each of the parts is provided on a side surface of the rotating member and is arranged to extend in different directions toward the outside in the radial direction of the rotating member, and the air is supplied to the space of the rotating member. multiple nozzles that spray the water to the outside,
Equipped with

According to the present invention, it is possible to provide a cleaning device, a cleaning system, and a cleaning method that can sufficiently remove dust from a cylindrical filter cloth.

1 is a schematic diagram showing the configuration of a bag filter according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing one filter cloth attached to a bag plate in the bag filter of FIG. 1; 1 is a front view showing the configuration of a cleaning system according to an embodiment of the present invention. 1 is a perspective view showing the configuration of a cleaning system according to an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a cleaning device according to an embodiment of the present invention suspended by a wire. 1 is a sectional view showing the configuration of a cleaning device according to an embodiment of the present invention. (a) is a cross-sectional view of the cleaning device of FIG. 6 taken along line AA, and (b) is a cross-sectional view showing an example of a Laval nozzle. FIG. 2 is an enlarged sectional view of the proximal end side of the cleaning device according to the embodiment of the present invention. (a) and (b) are schematic diagrams showing the procedure of dust removal work performed using the cleaning system according to the embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a filter cloth cleaning device, a cleaning system, and a cleaning method according to embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are given the same reference numerals.

The cleaning system is inserted inside a cylindrical filter cloth installed in a bag filter, and by injecting compressed air from a close range toward the inner surface of the filter cloth, it removes dust adhering to the filter cloth. This is a system that screens the outside. Dust is a substance that is collected by a filter cloth when gas is passed through the filter cloth, and includes, for example, fine particles suspended in the gas. Dust includes, for example, soot generated by burning coal or oil, heating metal, and dust generated by destruction of objects or scattering from deposits. Hereinafter, a case will be described using as an example a case where soot and dust of combustion ash generated by combustion of coal is removed as dust.

FIG. 1 is a schematic diagram showing the configuration of a bag filter according to an embodiment. To make it easier to understand, the left side of Figure 1 shows the situation during normal operation of a thermal power plant, and the right side of Figure 1 shows the moment when dust adhering to the filter cloth is brushed off during normal operation. There is. A bag filter is a dust collector that collects dust in combustion gas discharged from a boiler of a thermal power plant and reduces the concentration of soot and dust in the combustion gas.

Inside the bag filter, a bag plate extending on a horizontal plane is provided, and the bag plate has a plurality of through holes arranged vertically and horizontally (in the left-right direction and the depth direction in FIG. 1) for attaching filter cloth. There is. Combustion gas passes through the filter cloth attached to the bag plate from the outer peripheral surface toward the inner peripheral surface, and dust contained in the combustion gas is collected at this time. The clean combustion gas that has passed through the filter cloth is sucked in by an induced draft fan and exhausted to the outside through the chimney.

FIG. 2 is a cross-sectional view showing how one filter cloth is attached to the bag plate in the bag filter of FIG. 1. The filter cloth is a long cylindrical filter. The filter cloth includes a base fabric that provides strength and nonwoven fabrics that are provided on both sides of the base fabric and that efficiently capture dust. The filter cloth is made of resin fiber or glass fiber that has a high melting point and excellent chemical resistance. The resin fiber is made of, for example, polyphenylene sulfide (PPS), polyester, or heat-resistant nylon.

The filter cloth is attached to the through hole of the bag plate with a retainer attached inside the filter cloth. The retainer is a cylindrical member that holds the filter cloth in a cylindrical shape, and can be divided into two members. When the two members are connected, a joint is formed so as to be recessed inward. The retainer is made of a heat-resistant metal material, such as stainless steel.

Returning to FIG. 1, a blow pipe is arranged directly above the plurality of filter cloths arranged in a row so as to extend in parallel. The blow pipe is provided with jet ports at positions corresponding to the filter cloths, and jets high-pressure pulsed air toward the openings of each filter cloth. During operation of a thermal power plant, if the filter cloth becomes clogged and the differential pressure between the outer and inner surfaces of the filter cloth exceeds a specified value, pulsed air is injected from the blow pipe to block the outer surface of the filter cloth. Adhering dust is brushed off. However, if dust enters the inside of the filter cloth, for example, near the base cloth, the dust cannot be removed by this pulsed air jet alone. Under these conditions, the dust capture rate of the filter cloth decreases and the filter cloth itself deteriorates due to the high frequency of pulsed air injection, so the operation of the thermal power plant must be temporarily stopped and the filter cloth replaced. Dust must be removed using a cleaning system.

FIG. 3 is a front view showing the configuration of the cleaning system 1 according to the embodiment. The cleaning system 1 includes a cleaning device 10 that is inserted inside a filter cloth, a wire 2 that suspends the cleaning device 10 below, an electric hoist 3 that is connected to the wire 2 and moves the wire 2 at a constant speed, and a bag. A pedestal 4 installed on a plate and horizontally movably suspending the electric hoist 3; a hose 5 connected to the cleaning device 10 and supplying compressed air to the cleaning device 10; and a compressed air source (not shown) for supplying compressed air. The compressed air source is, for example, a portable compressed air source separate from the compressed air source of FIG. 1, and is installed in the bag filter by an operator before assembly of the cleaning system 1.

A shackle is attached to the tip of the wire 2, and the shackle is attached to a hook provided at the base end of the cleaning device 10.

The electric hoist 3 is a device that winds up and sends out the wire 2. The electric hoist 3 can move the cleaning device 10 at a constant speed, and prevents uneven dust removal from occurring on the filter cloth. A foot switch 3a is connected to the electric hoist 3, which can be operated by a worker's (user's) leg in order to wind up and send out the wire 2. Since the cleaning device 10 can be raised and lowered using the foot switch 3a, the worker can use both hands to assist in cradling the hose 5 connected to the cleaning device 10, and the cleaning device 10 can be operated by one person. I can do it.

FIG. 4 is a perspective view showing the configuration of the cleaning system 1 according to the embodiment. In FIG. 4, illustration of the electric hoist 3 is omitted for easy understanding. The pedestal 4 includes four columnar members 4a and eight horizontal members 4b that extend horizontally from the tip and base ends of each columnar member 4a and connect mutually adjacent columnar members 4a. The columnar member 4a and the horizontal member 4b are, for example, both single pipes, and both are fixed to each other by a joint fitting 4c. An installation plate 4d installed on a bag plate (floor surface) is fixed to the base end side of each columnar member 4a. In order to save the effort of moving and installing the pedestal 4 when removing dust from the filter cloth, the pedestal 4 may be configured to cover all of the blow pipes distributed in the vertical and horizontal directions.

A bridge member 4e is supported by a pair of horizontal members 4b facing each other so as to be movable in the longitudinal direction of the pair of horizontal members 4b. The bridge member 4e extends in a direction perpendicular to the pair of horizontal members 4b. To explain in more detail, a pipe trolley 4f is installed on each of the pair of horizontal members 4b so as to be movable in the longitudinal direction of the horizontal members 4b, and ring hooks 4g are respectively attached to both ends of the bridge member 4e. . A ring hook 4g is suspended from the hook of each pipe trolley 4f, so that the pair of horizontal members 4b movably support the bridge member 4e.

The electric hoist 3 is supported by the bridge member 4e so as to be movable in the longitudinal direction of the bridge member 4e. To explain in more detail, a pipe trolley 4f is installed on the bridge member 4e so as to be movable in the longitudinal direction of the bridge member 4e, and the pipe trolley 4f is attached to a hook provided at the base end of the electric hoist 3. There is. Therefore, the worker can easily move the cleaning device 10 suspended from the electric hoist 3 in two mutually orthogonal directions on a horizontal plane.
The above is the configuration of the cleaning system 1.

FIG. 5 is a cross-sectional view showing the cleaning device 10 according to the embodiment suspended by the wire 2. As shown in FIG. The cleaning device 10 is positioned directly above the filter cloth from which dust is to be removed by a worker manually moving the electric hoist 3 horizontally with respect to the pedestal 4, and then the operator presses the foot switch of the electric hoist 3. By operating 3a, it can be moved back and forth in the longitudinal direction of the filter cloth while being inserted inside the filter cloth. At this time, the cleaning device 10 injects the compressed air supplied from the hose 5 from the nozzle 13, thereby causing the components including the nozzle 13 to rotate around an axis extending in the longitudinal direction of the filter cloth, while the compressed air is The jet is made to collide with the entire inner periphery of the filter cloth, and the dust adhering to the entire outer periphery of the filter cloth is blown away without leaking.

FIG. 6 is a sectional view showing the configuration of the cleaning device 10 according to the embodiment. The cleaning device 10 includes a cylindrical member 11, a rotary member 12 rotatably supported at the tip of the cylindrical member 11 and to which air is supplied from the cylindrical member 11, and a rotary member 12 provided on the circumferential surface of the rotary member 12. It includes a pair of nozzles 13 and a cage 14 that is attached to the cylindrical member 11 and prevents the rotating member 12 and the nozzle 13 from coming into contact with the filter cloth.

The cylindrical member 11 is suspended by the wire 2 and has a linear flow path through which air flows. An end of a hose 5 is connected to the base end of the cylindrical member 11, and compressed air is supplied from the hose 5. An opening for supplying air to the rotating member 12 is formed in the distal end surface of the cylindrical member 11 . Furthermore, the inner circumferential surface of a bearing 15 is fixed to the outer circumferential surface of the tip of the cylindrical member 11 .

The rotating member 12 has a main body part 12a having a flow path through which air supplied from an opening in the distal end surface of the cylindrical member 11 flows, and is attached to the proximal end side of the main body part 12a. The main body 12a is provided with a lid portion 12b that is inserted between the main body portion 12b and a cover portion 12c that is attached to the distal end side of the main body portion 12a and seals the distal end side of the main body portion 12a so that air does not flow out from the distal end side of the main body portion 12a.

The main body portion 12a includes a bearing holding portion that is provided on the base end side and holds the bearing 15 so as to surround the outer circumferential surface of the bearing 15, and a pair of nozzles that are provided on the distal end side and are arranged to face each other. 13. A circular accommodating portion for accommodating the bearing 15 is formed in the bearing holding portion. Both the bearing holding part and the nozzle holding part are formed with a circular cross section and have a linear flow path through which air flows inside. The bearing holder has a relatively large diameter to accommodate the bearing 15, and the nozzle holder has a smaller diameter than the bearing holder in order to reduce the circular cross-sectional space through which the rotating member 12 and nozzle 13 pass. has been done.

The lid portion 12b is removably attached to the bearing holder while being placed on the upper surface of the bearing holder. Specifically, a plurality of female screw holes are provided in the upper surface of the bearing holding portion of the main body portion 12a, and a plurality of through holes corresponding to the female screw holes are formed in the lid portion 12b. The cover 12b can be fixed to the main body 12a by inserting the bolt 12d into the through hole with the cover 12b placed on the upper surface of the bearing holder and tightening it into the female threaded hole of the bearing holder of the main body 12a.

The cover portion 12c includes a circular flat plate and a circular ring protruding from the peripheral end of the flat plate in the central axis direction. The cover portion 12c is fitted into the main body portion 12a such that, for example, the inner circumferential surface of the circular ring contacts the outer circumferential surface of the distal end portion of the main body portion 12a.

Since the rotating member 12 has the above-described configuration, the air supplied from the opening provided on the distal end surface of the cylindrical member 11 flows straight into the flow path of the main body 12a of the rotating member 12, and flows into each nozzle 13. It is ejected towards the target. Therefore, pressure loss is less likely to occur when air is supplied from the cylindrical member 11 to the rotating member 12. Furthermore, since the rotating member 12 is disposed on the distal end side of the cylindrical member 11, the distal end side of the rotating member 12 can be formed to be thinner than the proximal end side, and as a result, the nozzle 13 is formed on the circumferential surface of the distal end side of the rotating member 12. Even if the cleaning device 10 is attached, the cleaning device 10 can be made compact.

7(a) is a cross-sectional view of the cleaning device 10 of FIG. 6 taken along line AA, and FIG. 7(b) is a cross-sectional view showing an example of a Laval nozzle. The nozzle 13 is a nozzle that increases the jet speed of the air to be jetted, and is, for example, a Laval nozzle. The Laval nozzle is a nozzle that has a throat in the middle, as shown in an example in FIG. 7(b), and can significantly suppress attenuation of the jet flow immediately after ejection. The nozzle 13 is attached to a through hole formed in the peripheral surface of the rotating member 12.

The nozzle 13 is inclined with respect to the radial direction of the rotating member 12 on a plane perpendicular to the rotation axis so as to generate rotational force in the rotating member 12 by jetting compressed air. The central axis of the nozzle 13 is inclined, for example, at an angle of 5° to 30° in the direction of rotation in the circumferential direction with respect to the radial direction of the rotating member 12. When the rotating member 12 rotates, the nozzle 13 also rotates, so that a jet stream can be sprayed from the nozzle 13 to the entire inner circumference of the filter cloth.

The spray speed from the nozzle 13 is set to such an extent that it is possible to remove dust attached to the inside of the base fabric of the filter cloth, and to suppress a decrease in the tensile strength of the filter cloth due to the jet of compressed air. In order to remove dust adhering to the inside of the filter cloth, it is preferable that the jet speed of the air upon reaching the filter cloth is 200 m/s or more.

In the cleaning device 10, since the nozzle 13 can reduce the cross-sectional area of the ejected fluid, the energy density of the jet stream increases, and dust can be removed efficiently. Further, since the air flow rate per cleaning device 10 is suppressed by the nozzle 13, a plurality of cleaning devices 10 can be connected at the same time depending on the performance of the compressed air source, and the number of cleaning devices 10 can be increased. As a result, a plurality of workers can remove dust from each filter cloth using individual cleaning devices 10, and it is possible to speed up the dust removal work in the bag filter.

Returning to FIG. 6, the cage 14 covers the rotating member 12 and the nozzle 13 so as not to obstruct the jet flow from the nozzle 13, and prevents the rotating member 12 and the nozzle 13 from coming into contact with the filter cloth. The cage 14 is formed to be narrower at its distal and proximal ends to prevent it from getting caught on the filter cloth. The cage 14 includes an upper guard member 14a disposed on its base end side, a lower guard member 14b disposed on its distal end side at a position away from the upper guard member 14a, and an upper guard member 14a and a lower guard member 14b. and a conical member 14d that is detachably attached to the base end side of the upper guard member 14a and supported by the cylindrical member 11.

The upper guard member 14a is a cylindrical member that accommodates the bearing holding portion of the main body portion 12a of the rotating member 12 and the lid portion 12b therein, and guards the rotating member 12 and the nozzle 13 from coming into contact with the filter cloth. The upper guard member 14a is an example of a first member that is supported by the cylindrical member 11 and covers the base end surface of the rotating member 12.

The lower guard member 14b is a member that accommodates the cover portion 12c of the rotating member 12 therein and guards the rotating member 12 and the nozzle 13 from coming into contact with the filter cloth. The lower guard member 14b has a recessed portion on its upper surface portion for accommodating the cover portion 12c of the rotating member 12. The lower guard member 14b has a chamfered bottom surface to prevent it from getting caught on the filter cloth. The lower guard member 14b is an example of a second member that covers the distal end surface of the rotating member 12.

The spokes 14c are rod-shaped members that connect the circumferential end of the lower surface of the upper guard member 14a and the circumferential end of the upper surface of the lower guard member 14b. The number of spokes 14c is, for example, eight. Each spoke 14c is arranged at equal intervals in the circumferential direction with respect to the upper guard member 14a and the lower guard member 14b. Since the spokes 14c may become a factor in getting caught on the filter cloth, it is preferable to make the spokes as short as possible within a range that allows the jet stream from the nozzle 13 to be discharged to the outside. By shortening the length of the spokes 14c, the strength of the cage 14 as a whole can be increased.

The spokes 14c play a role of temporarily blocking the jet flow when the circumferential position of the nozzle 13 matches the position of the spoke 14c when the nozzle 13 rotating around the axis of the rotating member 12 injects compressed air. also fulfill. Since the flow of compressed air injected from the nozzle 13 is temporarily blocked by the spokes 14c, periodic pulsations occur in the jet that collides with the filter cloth, and the dust removal effect on the filter cloth can be enhanced.

The conical member 14d is formed to gradually narrow from the distal end to the proximal end in order to prevent the conical member from being caught on the filter cloth. The conical member 14d includes a through hole into which the cylindrical member 11 is inserted and fixed. A male thread is formed on the distal end side of the conical member 14d, and a female threaded hole corresponding to the male thread is formed on the inner surface of the proximal end side of the upper guard member 14a. Therefore, by tightening the male screw of the conical member 14d into the female screw hole of the upper guard member 14a, both can be fixed.

The bearing 15 rotatably supports the rotating member 12 with respect to the cylindrical member 11 in a state where the rotating member 12 is suspended from the cylindrical member 11 . The inner circumferential surface of the bearing 15 is fixed to the outer circumferential surface on the distal end side of the cylindrical member 11, and the outer circumferential surface of the bearing 15 is fixed to the inner circumferential surface on the proximal side of the main body portion 12a of the rotating member 12. The bearing 15 is preferably a bearing that can receive both axial loads and radial loads, such as a deep groove ball bearing.

FIG. 8 is an enlarged sectional view of the proximal end side of the cleaning device 10 according to the embodiment. A pair of hooks 11a facing each other are provided on the cylindrical member 11 of the cleaning device 10 so as to protrude in the radial direction, and a connecting device 2A for connecting the wire 2 and the cleaning device 10 is provided on the distal end side of the wire 2. is provided. The connecting device 2A includes a shackle 2a connected to the wire 2, a string member 2b inserted through the loop of the shackle 2a, and a pair of shackles connected to both ends of the string member 2b and attached to each hook 11a. 2c. A plurality of pairs of the string member 2b and the pair of shackles 2c may be attached to the shackle 2a and the hook 11a.

The cleaning device 10 includes a cylindrical cover 16 that covers a connection point with the wire 2 and the hose 5 on its base end side. The cover 16 prevents the connection points, including the coupling device 2A, from getting caught in the joints of the retainer when the cleaning device 10 moves inside the filter cloth. The cross section of the cover 16 is, for example, circular. The tip of the cover 16 has an opening through which the wire 2 and hose 5 pass, and is formed to gradually narrow to prevent it from getting caught on the filter cloth.
The above is the configuration of the cleaning device 10.

Next, a flow of dust removal work from a filter cloth using the cleaning system 1 according to the embodiment will be explained. The dust removal work from the filter cloth is performed by a worker entering the bag filter while the turbine of the thermal power plant is stopped and the flow of combustion gas into the bag filter is stopped.

First, as shown in FIGS. 3 and 4, the cleaning system 1 is assembled inside the bag filter. Specifically, the pedestal 4 is assembled on the bag plate, the electric hoist 3 is suspended from the bridge member 4e of the assembled pedestal 4, and the cleaning device 10 is attached to the wire 2 extending from the electric hoist 3. Further, one end of the hose 5 is connected to a compressed air source, and the other end of the hose 5 is connected to the cleaning device 10.

Next, one blow pipe located above the line of filter cloths from which dust is to be removed in the bag filter is removed. Temporarily store the removed blowpipe in a safe place and leave the other blowpipes in place for now. This allows the worker to work on the blowpipe, which eliminates the need for curing work to cover the retainer with cushioning material to prevent damage, improving work efficiency, compared to the case where all the blowpipe is removed at once. Note that a plate member such as a control panel may be installed on the blow pipe to prevent foreign objects from falling and to function as a work floor.

Next, the compressed air source connected to the hose 5 is activated, and supply of compressed air from the hose 5 to the cleaning device 10 is started. In the cleaning device 10, compressed air is injected from the nozzle 13, and at the same time as the nozzle 13 rotates around the axis of the rotating member 12, the jet collides with the spoke 14c, thereby generating periodic pulsations in the jet. Since the filter cloth itself vibrates as the periodically pulsating jet collides with the inner surface of the filter cloth, dust adhering to the filter cloth can be effectively brushed off.

Next, as shown in FIG. 5, the cleaning device 10 is moved directly above the filter cloth and inserted inside the filter cloth, and in this state, the cleaning device 10 is moved back and forth once inside the filter cloth, so that one Remove dust adhering to the filter cloth. Specifically, the worker manually moves the electric hoist 3 in the horizontal direction while cradling the hose 5 with both hands, and moves the cleaning device 10 directly above the filter cloth. Next, while cradling the hose 5 with both hands, the foot switch 3a of the electric hoist 3 is operated to lower the cleaning device 10 into the filter cloth at a constant speed. Thereafter, after the cleaning device 10 reaches the lower end of the filter cloth, the moving direction is reversed and the cleaning device 10 is raised at a constant speed, thereby causing the cleaning device 10 to reciprocate once within the filter cloth. If necessary, the cleaning device 10 may be moved back and forth within the filter cloth two or more times. This dust removal operation is performed sequentially on all of the filter cloths lined up in a row after the blow pipe is removed.

Next, as shown in FIGS. 9(a) and 9(b), after pulling out the cleaning device 10 from the filter cloth, the blow pipe adjacent to the removed blow pipe is removed, and the dust is removed from the filter cloth. Install it to cover the cloth. Next, dust is removed from all exposed filter cloths one by one using the same procedure. By repeating the same procedure, all blow pipes are sequentially removed and dust is removed from all filter cloths.

Once the dust has been removed from the last filter cloth, the compressed air source is turned off and the blow pipe, which has been temporarily stored in a safe place, is removed from the last filter cloth lined up. Place it on the cloth. Next, the cleaning system 1 is disassembled and removed from the inside of the bag filter, and the work of removing dust from the filter cloth in the bag filter is completed.
The above is the flow of dust removal work from the filter cloth in a bag filter.

As described above, the cleaning device 10 according to the embodiment includes a cylindrical member 11 through which air can flow, and a cylindrical member 11 that is rotatably supported around an axis with respect to the cylindrical member 11. A rotating member 12 through which air is supplied to the internal space through an opening, and a nozzle provided on a side surface of the rotating member 12 and extending toward the outside of the rotating member 12 to inject the air supplied to the rotating member 12 to the outside. 13, and the nozzle 13 is arranged to be inclined with respect to the radial direction of the rotating member 12 so that the rotating member 12 rotates around the axis due to reaction when air is injected to the outside. For this reason, by rotating the nozzle 13 around the axis of the rotating member 12 and causing the jet from the nozzle 13 to collide with the entire inner circumference of the filter cloth, uneven dust removal can be prevented and the inside of the filter cloth can be prevented. It can remove the dust that has entered. By performing such dust removal work depending on the degree of clogging, the life of the filter cloth can be extended.

The present invention is not limited to the embodiments described above, and modifications described below are also possible.

(Modified example)
In the embodiment described above, the main body portion 12a and the cover portion 12c of the rotating member 12 are separate bodies, but the present invention is not limited to this. Both may be integrated in advance.

In the embodiment described above, the nozzle holding portion of the main body portion 12a is formed to have a smaller diameter than the bearing holding portion, but the present invention is not limited to this. Depending on the size of the bearing 15, the nozzle holding part may have the same or equivalent diameter as the bearing holding part.

In the embodiment described above, the two nozzles 13 facing each other are provided on the rotating member 12, but the present invention is not limited to this. The number of nozzles 13 is arbitrary and may be set in consideration of the flow rate of compressed air to the cleaning device 10 and the sizes of the rotating member 12, nozzles 13, and cage 14.

In the embodiment described above, the nozzle 13 is arranged at an angle with respect to the radial direction of the rotating member 12 so that the rotating member 12 rotates around the axis due to the reaction when air is injected to the outside. It is not limited to this. The rotating member 12 may be configured to rotate around the axis using other means. For example, the rotating member 12 may be configured to rotate around the axis by an external power source, such as a motor. good. In this case, it is not necessary to arrange the nozzle 13 at an angle with respect to the radial direction of the rotating member 12, and for example, the nozzle 13 may be arranged so as to extend in the radial direction of the rotating member 12.

In the embodiment described above, the conical member 14d is provided above the upper guard member 14a, but the present invention is not limited to this. For example, the upper guard member 14a and the conical member 14d may be integrally configured.

In the above embodiment, the cage 14 includes the upper guard member 14a, the lower guard member 14b, the spokes 14c, and the conical member 14d, but the present invention is not limited thereto. The cage 14 may have any shape as long as it can prevent the rotating member 12 and the nozzle 13 from coming into contact with the filter cloth. It may also be a cage stretched in the direction.

Although the cage 14 is provided in the above embodiment, the present invention is not limited to this. The cage 14 may be omitted if the inner surface of the filter cloth is not damaged even if the rotating member 12 and the nozzle 13 contact the inner surface of the filter cloth.

In the embodiment described above, the cover 16 has a cylindrical shape, but the present invention is not limited to this. For example, a reducer whose diameter gradually decreases may be attached as the cover 16.

In the embodiment described above, the electric hoist 3 is suspended from the pedestal 4, but the present invention is not limited thereto. For example, the electric hoist 3 may be suspended by a hanging bolt provided on the ceiling of the bag filter, or the electric hoist 3 may be suspended by a crane such as a multi-crane installed on the bag plate.

In the above embodiment, the electric hoist 3 is operated using the foot switch 3a, but the present invention is not limited to this. For example, a manual switch, such as a pendant switch, may be used to operate the electric hoist 3. In this case, the work of cleaning the hose 5 with both hands and the operation of the electric hoist 3 may be shared between two workers.

In the embodiment described above, the cleaning device 10 is moved up and down by the electric hoist 3, but the present invention is not limited to this. For example, in order to simplify the cleaning system 1, a chain block may be used to manually move the cleaning device 10 up and down.

In the embodiment described above, the cleaning system 1 is applied to remove dust from filter cloths in a bag filter in which a large number of filter cloths are installed vertically and horizontally, but the present invention is not limited to this. For example, the cleaning system 1 may be applied to a small bag filter with a filtration area of about 1 m ² .

In the embodiment described above, the cleaning system 1 is applied to the dust removal work on the filter cloth that collects the combustion ash of coal discharged from the boiler, but the present invention is not limited to this. For example, the cleaning system 1 may be applied to dust removal work on filter cloths that collect various types of dust emitted at steel plants, garbage incineration facilities, chemical plants, cement factories, food factories, and industrial waste processing facilities. .

The above-mentioned embodiments are illustrative, and the present invention is not limited thereto, and various embodiments are possible without departing from the spirit of the invention described in the claims. The components described in the embodiments and modifications can be freely combined. Furthermore, inventions equivalent to the inventions described in the claims are also included in the present invention.

1 Cleaning system 2 Wire 3 Electric hoist 3a Foot switch 4 Frame 5 Hose 10 Cleaning device 11 Cylindrical member 12 Rotating member 13 Nozzle 14 Cage 14a Upper guard member 14b Lower guard member 14c Spoke 15 Bearing 16 Cover

Claims (12)

A cleaning device that can be inserted into a cylindrical filter cloth provided in a bag filter,
a cylindrical member through which air can flow;
Rotation that is arranged on the tip side of the cylindrical member, is rotatably supported around an axis with respect to the cylindrical member, and that air is supplied to the internal space from an opening provided on the tip surface of the cylindrical member. parts and
Each of the parts is provided on a side surface of the rotating member and is arranged to extend in different directions toward the outside in the radial direction of the rotating member, and the air is supplied to the space of the rotating member. multiple nozzles that spray the water to the outside,
A cleaning device comprising: further comprising a cage supported by the cylindrical member, covering the rotating member and the nozzle so that a jet stream from the nozzle can pass therethrough, and preventing the rotating member and the nozzle from coming into contact with the filter cloth;
The cleaning device according to claim 1 . A cleaning device that can be inserted into a cylindrical filter cloth provided in a bag filter,
a cylindrical member through which air can flow;
Rotation that is arranged on the tip side of the cylindrical member, is rotatably supported around an axis with respect to the cylindrical member, and that air is supplied to the internal space from an opening provided on the tip surface of the cylindrical member. parts and
a plurality of nozzles provided on a side surface of the rotating member, extending in a cylindrical shape toward the outside in the radial direction of the rotating member, and injecting air supplied to the space of the rotating member to the outside;
a cage supported by the cylindrical member, covering the rotating member and the nozzle so that a jet flow from the nozzle can pass therethrough, and preventing the rotating member and the nozzle from coming into contact with the filter cloth;
The cage is supported by the cylindrical member and includes a first member that covers the proximal end surface of the rotating member, a second member that covers the distal end surface of the rotating member, and the first member and the second member. a plurality of spokes connected to each peripheral end of the member and extending in the axial direction of the rotating member,
The nozzle is arranged on the rotating member so that air injected from the nozzle collides with each spoke while the rotating member is rotating .
cleaning equipment. The cage covers a distal end surface and a proximal end surface of the rotating member, and is formed to be movable in the longitudinal direction of the filter cloth when inserted into the filter cloth.
The cleaning device according to claim 2 or 3 . The cage includes a conical member that is supported by the cylindrical member while being disposed on the proximal end side of the cage, and is formed to gradually narrow from the cage side toward the cylindrical member side.
The cleaning device according to any one of claims 2 to 4 . The nozzle is arranged at an angle with respect to the radial direction of the rotating member so that the rotating member rotates around an axis due to reaction when air is injected to the outside.
A cleaning device according to any one of claims 1 to 5 . A portion of the rotating member where the nozzle is provided is formed thinner than a portion of the rotating member that is supported by the cylindrical member,
The nozzle is arranged so as to protrude outward from a side surface of the rotating member.
A cleaning device according to any one of claims 1 to 6 . Further comprising a cover provided on the base end side of the cylindrical member and covering a portion where a wire suspending the cylindrical member and a hose supplying air from a compressed air source are connected to the cylindrical member.
A cleaning device according to any one of claims 1 to 7. The nozzle is a Laval nozzle that compresses and expands air.
A cleaning device according to any one of claims 1 to 8. A cleaning device according to any one of claims 1 to 9,
a wire connected to the cleaning device and suspending the cleaning device;
a hose connected to the cleaning device and supplying air from a compressed air source to the cleaning device;
a pedestal that is installed on a floor surface and suspends the wire so as to be movable in a horizontal direction;
Cleaning system with. an electric hoist that is connected to the wire while being suspended from the pedestal and winds up and sends out the wire;
A foot switch is connected to the electric hoist for a user to operate winding and feeding of the wire.
A cleaning system according to claim 10. A cleaning method performed using a cleaning device, the method comprising:
a first removal step of removing one blow pipe provided in the bag filter;
a first removal step of removing dust attached to the filter cloth by inserting the cleaning device into the cylindrical filter cloth exposed in the first removal step and jetting air;
a second removal step of removing one blow pipe adjacent to the row of filter cloths from which dust has been removed in the first removal step;
a mounting step of mounting one blow pipe removed in the second removal step onto a row of filter cloths from which dust has been removed in the first removal step;
a second removal step of removing dust attached to the filter cloth by inserting the cleaning device into the cylindrical filter cloth exposed in the second removal step and jetting air;
including;
The cleaning device includes:
A cleaning device that can be inserted into a cylindrical filter cloth provided in a bag filter,
a cylindrical member through which air can flow;
Rotation that is arranged on the tip side of the cylindrical member, is rotatably supported around an axis with respect to the cylindrical member, and that air is supplied to the internal space from an opening provided on the tip surface of the cylindrical member. parts and
a plurality of nozzles provided on a side surface of the rotating member, extending in a cylindrical shape toward the outside in the radial direction of the rotating member, and injecting air supplied to the space of the rotating member to the outside;
Equipped with
Cleaning method.

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