A water film dust collector capable of online cleaning of induced draft fan and a method of using the same

Abstract

The present invention discloses a water film dust collector capable of online cleaning of an induced draft fan and a method for using the same, comprising a dust removal tower, an induced draft duct, an induced draft section and an ash settling section; the induced draft duct is connected to the top of the dust removal tower; the inlet of the ash settling section is connected to the bottom of the dust removal tower, and the outlet is connected to the upper part of the dust removal tower; the induced draft section comprises an induced draft fan, a wiping box and an induced vibration box; the induced draft fan is connected to the induced draft duct; the wiping box and the induced vibration box are arranged on the induced draft duct on both sides of the induced draft fan; tracks are arranged on the inner walls of the wiping box and the induced vibration box; a working block is movably connected to the track; an operating rod is arranged on the top of the working block; a cleaning brush is arranged on the working block in the wiping box; a rubber block is arranged on the working block in the induced vibration box; an air inlet is arranged at the bottom of the dust removal tower, and a guide column is arranged inside. The device can realize online cleaning of the induced draft fan blades without stopping the machine for processing, without delaying production, and reducing energy consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler dust removal equipment and relates to a water film dust collector capable of online cleaning of an induced draft fan and a use method thereof. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The original meaning of a pot refers to a water container heated on fire, and a furnace refers to a place where fuel is burned. A boiler includes two major parts: a pot and a furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and has a small number of applications in industrial production. A boiler that produces steam is called a steam boiler, often referred to as a boiler, and is mostly used in thermal power plants, ships, locomotives and industrial and mining enterprises. Dust and flue gas are inevitably generated during the use of the boiler. Boiler dust removal is to separate the dust in the boiler from the flue gas, thereby reducing dust pollution and facilitating further desulfurization and denitrification of the flue gas. Water film dust collector is a purification device that uses dust-containing gas to impact the inner wall of the dust collector or other special components to form a water film in some way, so that the dust is captured by the water film and the gas is purified. When the water film dust collector runs at high load for a long time, a lot of dust will accumulate on the blades of the induced draft fan, causing the blades to be unbalanced, affecting the operation of the induced draft fan. Stopping the machine to clean the dust will affect production and increase startup energy consumption. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to propose a water film dust collector capable of online cleaning of induced draft fans and a method of using the same. The device can realize online cleaning of induced draft fan blades without stopping the machine for processing, without delaying production, and reducing energy consumption.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A water film dust collector with an induced draft fan that can be cleaned online, comprises a dust collection tower, an induced draft duct, an induced draft section and an ash settling section; the induced draft duct is connected to the top of the dust collection tower; the inlet of the ash settling section is connected to the bottom of the dust collection tower through a pipeline, and the outlet is connected to the upper part of the dust collection tower; the induced draft section comprises an induced draft fan, a wiping box and an induced vibration box; the induced draft fan is connected to the induced draft duct; the wiping box and the induced vibration box are arranged on the induced draft duct on both sides of the induced draft fan and are connected to the induced draft duct; tracks are provided on the inner walls of the wiping box and the induced vibration box; the tracks are inclined downward in the direction of the position of the induced draft fan, and the bottom is horizontal; a working block is movably connected to the track; an operating rod is provided on the top of the working block; two groups of the operating rods respectively pass through the wiping box and the induced vibration box upward; a cleaning brush is provided on the working block in the wiping box; a rubber block is provided on the working block in the induced vibration box; an air inlet is provided at the lower part of the dust collection tower, and a guide column is provided inside. The ash settling section is used to precipitate smoke dust in sewage, and the precipitated water is pumped into the top of the dust removal tower for smoke dust removal, forming a water cycle; the induced draft fan extracts the gas in the dust removal tower; the tops of the wiping box and the induced vibration box are both provided with through grooves for the movement of the operating rod; the operating rod is pushed to move the working block along the track so that the cleaning brush or rubber block connected to the working block is close to or away from the blades of the induced draft fan; the horizontal position of the bottom of the track has a limited length to prevent the cleaning brush and rubber block from being over-propelled and causing damage to the induced draft fan; the air inlet is connected to the pipe for exhausting the flue gas from the boiler, and the outlet angle is tangential to the inner wall of the dust removal tower; the guide column can cause the airflow in the dust removal tower to spiral and rise around the guide column, and the dust in the airflow is thrown onto the inner wall of the dust removal tower under the action of centrifugal force, and then carried down by the water film on the inner wall of the dust removal tower.

[0006] As a further technical improvement, a valve I is provided on the induced draft pipe after the induced draft section, and a dust exhaust pipe is connected in front of the valve I; a valve II is provided at the inlet of the dust exhaust pipe; the dust exhaust pipe is connected to the inlet of the dust settling section. After cleaning the fan blades of the induced draft fan, dust will be mixed into the airflow that has been treated with dust removal. At this time, reducing or closing the rising valve I can reduce the discharge of dust; at the same time, opening valve II can introduce dust into the dust exhaust pipe and finally pass it into the dust settling section for sedimentation treatment.

[0007] As a further technical improvement, the cleaning brush is composed of a mixed arrangement of plastic bristles and sponge blocks. The plastic bristles are tough, can be bent and restored, and are large in diameter and not easy to break; the sponge block is strip-shaped, and the surface is treated with wear resistance, such as PU resin immersion coating; the cleaning brush can be washed or replaced.

[0008] As a further technical improvement, the outer part of the rubber block is made of wear-resistant rubber and a spring is arranged inside. The rubber block can deform after contacting the induced draft fan blades, and then recover under the action of the spring and contact the induced draft fan blades again; at the same time, the rubber block has a certain hardness due to the spring arranged inside, and can deform the induced draft fan blades after contact, and then immediately recover to generate vibration, so as to achieve the effect of shaking off dust.

[0009] As a further technical improvement, the connection between the wiping box and the vibration box and the induced air duct is hinged with an automatic return sealing door. The automatic return sealing door is hinged with the induced air duct, and a return spring is provided at the hinged position; a sealing rubber pad is provided on the automatic return sealing door to prevent the gas in the induced air duct from leaking out.

[0010] As a further technical improvement, a spray coil is provided at the upper part of the dust removal tower; the ash settling section includes an ash settling box I and an ash settling box II which are sequentially connected by pipes; the outlet of the ash settling box II is connected to the spray coil through a pipe. The spray coil is arranged around the inner wall of the dust removal tower, and some spray heads face the inner wall of the dust removal tower, so that a water film can be formed on the inner wall of the dust removal tower.

[0011] As a further technical improvement, the induced draft pipes connected to both sides of the induced draft fan are provided with observation ports, which are transparent and can be made of transparent organic glass, for observing the condition of the induced draft fan blades.

[0012] The above-mentioned method for using a water film dust collector capable of online cleaning of an induced draft fan is as follows:

[0013] Dust removal in the tower: The gas with smoke and dust discharged from the general boiler equipment is sprayed into the dust removal tower from the air inlet in an inclined direction under the action of the induced draft fan, and finally spirals up along the inner wall of the dust removal tower; water falls from the upper part of the dust removal tower, taking away most of the smoke and dust, and then falls into the ash settling section; the water after sedimentation in the ash settling section enters the upper part of the dust removal tower again, forming circulating water, and continues to remove dust;

[0014] Wiping and dust removal of fan: reduce the speed of the induced draft fan without stopping it; reduce or close valve I and open valve II; push the operating lever on the wiping box toward the induced draft fan, and the working block will move diagonally downward along the track; after the working block reaches the horizontal position at the bottom of the track, slowly push the operating lever so that the cleaning brush gradually approaches the blades of the induced draft fan and finally inserts into the gap between the blades; as the blades of the induced draft fan rotate, the cleaning brush wipes the dust off the blades;

[0015] Fan vibration dust removal: reduce the speed of the induced draft fan, but do not stop the machine; reduce or close valve I, open valve II; push the operating lever on the induced draft box toward the induced draft fan, and the working block will move diagonally downward along the track; after the working block reaches the horizontal position at the bottom of the track, slowly push the operating lever so that the rubber block slowly touches the blades of the induced draft fan; when the blades rotate, they touch the rubber block, causing slight deformation of the blades, and then quickly recover. During this process, the blades vibrate, shaking off the dust accumulated on the blades;

[0016] Dust recovery: The airflow carries the dust cleaned from the induced draft fan blades into the dust exhaust pipe, and then mixes with the sewage flowing down from the bottom of the dust removal tower and enters the dust settling section for sedimentation; after the fan wiping dust removal and fan shaking dust removal are completed, the dust exhaust pipe is continuously ventilated for at least three minutes, and then valve I is opened, valve II is closed, and the normal working speed of the induced draft fan is restored.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The device of the present invention is provided with a wiping box, so that the fan blades of the induced draft fan can be wiped and dusted online when the water film dust collector is turned on, without stopping the machine, thereby ensuring that the fan blades are clean.

[0019] 2. The device of the present invention, through the provision of a vibration-inducing box, can cause the induced draft fan blades to produce slight vibrations when the water film dust collector is turned on, thereby shaking off the accumulated dust and realizing online dust cleaning of the induced draft fan blades.

[0020] 3. The device of the present invention guides the airflow carrying smoke and dust in the dust removal tower to spiral and rise through the setting of the guide column. The smoke and dust particles are thrown onto the water film on the inner wall of the dust removal tower under the action of centrifugal force and are carried down by the water film, thereby enhancing the dust removal effect of the equipment and reducing the dust accumulation problem on the fan blades.

[0021] 4. The ash settling section of the present invention is provided with two groups of ash settling tanks, which can further precipitate impurities in the circulating ash settling water, improve the dust removal effect of the equipment, and reduce the dust accumulation on the induced draft fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the device.

[0023] Figure 2 It is a schematic diagram of the induced draft section structure.

[0024] Figure 3 Schematic diagram of the rubber block structure.

[0025] Figure numerals: 1-dust removal tower, 2-induced draft duct, 3-induced draft section, 4-ash setting section, 5-induced draft fan, 6-wiping box, 7-induced vibration box, 8-track, 9-working block, 10-operating lever, 11-cleaning brush, 12-rubber block, 13-automatic return sealing door, 14-air inlet, 15-guide column, 16-ash setting box I, 17-ash setting box II, 18-valve I, 19-dust exhaust pipe, 20-valve II, 21-spray coil, 22-observation port, 23-spring. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings.

[0027] Embodiment 1:

[0028] like Figure 1-3 As shown, a water film dust collector capable of online cleaning of an induced draft fan comprises a dust removal tower 1, an induced draft duct 2, an induced draft section 3 and an ash settling section 4; the induced draft duct 2 is connected to the top of the dust removal tower 1; the inlet of the ash settling section 4 is connected to the bottom of the dust removal tower 1 through a pipeline, and the outlet is connected to the upper part of the dust removal tower 1; the induced draft section 3 comprises an induced draft fan 5, a wiping box 6 and an induced vibration box 7; the induced draft fan 5 is connected to the induced draft duct 2; the wiping box 6 and the induced vibration box 7 are arranged on the induced draft duct 2 on both sides of the induced draft fan 5 and are connected to the induced draft duct 2; Tracks 8 are provided on the inner walls of the wiping box 6 and the vibration-inducing box 7; the track 8 is inclined downward toward the direction of the induced draft fan 5, and the bottom is horizontal; a working block 9 is movably connected to the track 8; an operating rod 10 is provided on the top of the working block 9; two groups of operating rods 10 respectively pass through the wiping box 6 and the vibration-inducing box 7 upward; a cleaning brush 11 is provided on the working block 9 in the wiping box 6; a rubber block 12 is provided on the working block 9 in the vibration-inducing box 7; an air inlet 14 is provided at the lower part of the dust removal tower 1, and a guide column 15 is provided inside. The ash settling section 4 is used to precipitate smoke dust in sewage, and the precipitated water is pumped into the top of the dust removal tower 1 for smoke dust removal, forming a water cycle; the induced draft fan 5 extracts the gas in the dust removal tower 1; the tops of the wiping box 6 and the induced vibration box 7 are both provided with through grooves for the movement of the operating rod 10; pushing the operating rod 10 can move the working block 9 along the track 8, so that the cleaning brush 11 or rubber block 12 connected to the working block 9 is close to or away from the fan blades of the induced draft fan 5; the length of the horizontal position at the bottom of the track 8 is limited to avoid excessive advancement of the cleaning brush 11 and the rubber block 12, which may cause damage to the induced draft fan 5; the air inlet 14 is connected to the pipe for exhausting the flue gas from the boiler, and the outlet angle is along the tangential direction of the inner wall of the dust removal tower 1; the guide column 15 can cause the airflow in the dust removal tower 1 to spiral up around the guide column 15, and the dust in the airflow is thrown onto the inner wall of the dust removal tower 1 under the action of centrifugal force, and then is carried down by the water film on the inner wall of the dust removal tower 1.

[0029] A valve I18 is provided on the induced draft pipe 2 after the induced draft section 3, and a dust exhaust pipe 19 is connected in front of the valve I18; a valve II20 is provided at the inlet of the dust exhaust pipe 19; the dust exhaust pipe 19 is connected to the inlet of the dust settling section 4. After cleaning the fan blades of the induced draft fan 5, dust will be mixed into the airflow after the dust removal treatment. At this time, reducing or closing the rising valve I18 can reduce the discharge of dust; at the same time, opening the valve II20 can introduce dust into the dust exhaust pipe 19, and finally pass it into the dust settling section 4 for sedimentation treatment.

[0030] The cleaning brush 11 is composed of a mixed arrangement of plastic bristles and sponge blocks. The plastic bristles are tough, can be bent and restored, and have a large diameter and are not easy to break; the sponge block is strip-shaped, and the surface is treated with wear resistance, such as PU resin immersion coating; the cleaning brush 11 can be cleaned or replaced.

[0031] The outer part of the rubber block 12 is made of wear-resistant rubber, and a spring 23 is arranged inside. The rubber block 12 can be deformed after contacting the blades of the induced draft fan 5, and then recover under the action of the spring 23 and contact the blades of the induced draft fan 5 again; at the same time, the rubber block 12 has a certain hardness because the spring 23 is arranged inside, and can deform the blades of the induced draft fan 5 after contact, and then immediately recover to generate vibration, so as to achieve the effect of shaking off dust.

[0032] A spray coil 21 is provided at the upper part of the dust removal tower 1; the ash settling section 4 includes an ash settling box I 16 and an ash settling box II 17 connected in sequence through pipelines; the outlet of the ash settling box II 17 is connected to the spray coil 21 through a pipeline. The spray coil 21 is arranged around the inner wall of the dust removal tower 1, and some spray heads are facing the inner wall of the dust removal tower 1, so that a water film can be generated on the inner wall of the dust removal tower 1.

[0033] The method of use of the present invention is as follows:

[0034] Dust removal in the tower: The gas with smoke and dust discharged from the general boiler equipment is sprayed into the dust removal tower 1 from the air inlet 14 in an inclined direction under the action of the induced draft fan 5, and finally spirals up along the inner wall of the dust removal tower 1; water falls from the upper part of the dust removal tower 1, taking away most of the smoke and dust, and then falls into the dust settling section 4; the water after precipitation in the dust settling section 4 enters the upper part of the dust removal tower 1 again, forming circulating water, and continues to remove dust;

[0035] Wiping and dust removal of the fan: reduce the speed of the induced draft fan 5 without stopping the machine; reduce or close valve I 18, and open valve II 20; push the operating rod 10 on the wiping box 6 toward the induced draft fan 5, and the working block 9 will move diagonally downward along the track 8; after the working block 9 reaches the horizontal position at the bottom of the track 8, slowly push the operating rod 10, so that the cleaning brush 11 gradually approaches the blades of the induced draft fan 5 and finally inserts into the gap between the blades; as the blades of the induced draft fan 5 rotate, the cleaning brush 11 wipes the dust on the blades;

[0036] Fan shaking off dust removal: reduce the speed of the induced draft fan 5, but do not stop the machine; reduce or close valve I 18, open valve II 20; push the operating rod 10 on the induced vibration box 7 toward the induced draft fan 5, and the working block 9 will move diagonally downward along the track 8; after the working block 9 reaches the horizontal position at the bottom of the track 8, slowly push the operating rod 10 so that the rubber block 12 slowly touches the blades of the induced draft fan 5; when the blades rotate, they touch the rubber block 12, causing slight deformation of the blades, and then quickly recover. During this process, the blades vibrate, shaking off the dust accumulated on the blades;

[0037] Dust recovery: The airflow carries the dust cleaned from the blades of the induced draft fan 5 into the dust exhaust pipe 19, and then mixes with the sewage flowing down from the bottom of the dust removal tower 1, and enters the dust settling section 4 for sedimentation; after the fan wiping dust removal and the fan shaking dust removal are completed, the dust exhaust pipe 19 is continuously ventilated for at least three minutes, and then the valve I18 is opened, the valve II20 is closed, and the normal working speed of the induced draft fan 5 is restored.

[0038] Embodiment 2:

[0039] The difference between this embodiment and the first embodiment is that the connection parts of the wiping box 6 and the vibration box 7 with the induced air duct 2 are hinged with an automatic return sealing door 13. The automatic return sealing door 13 is hinged with the induced air duct 2, and a return spring is provided at the hinged position; the automatic return sealing door 13 is provided with a sealing rubber pad to prevent the gas in the induced air duct 2 from leaking out.

[0040] The method of use of this embodiment is the same as that of embodiment 1.

[0041] Embodiment 3:

[0042] The difference between this embodiment and embodiment 2 is that observation ports 22 are provided on the induced draft pipes 2 connected to both sides of the induced draft fan 5. The observation ports 22 are transparent and can be made of transparent organic glass to observe the status of the blades of the induced draft fan 5.

[0043] The method of use of this embodiment is the same as that of embodiment 1.

[0044] Embodiment 4:

[0045] The difference between this embodiment and embodiment 3 is that the connection parts of the wiping box 6 and the vibration box 7 with the induced draft duct 2 are hinged with an automatic return sealing door 13. The automatic return sealing door 13 is hinged with the induced draft duct 2, and a return spring is provided at the hinged position; a sealing rubber pad is provided on the automatic return sealing door 13 to prevent the gas in the induced draft duct 2 from leaking out. The induced draft ducts 2 connected to both sides of the induced draft fan 5 are provided with observation ports 22. The observation ports 22 are transparent and can be made of transparent organic glass to observe the condition of the fan blades of the induced draft fan 5.

[0046] The method of use of this embodiment is the same as that of embodiment 1.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A water film dust collector capable of online cleaning of an induced draft fan, comprising a dust removal tower (1), an induced draft duct (2), an induced draft section (3) and a dust settling section (4); characterized in that: The induced draft duct (2) is connected to the top of the dust removal tower (1); the inlet of the dust settling section (4) is connected to the bottom of the dust removal tower (1) through a pipeline, and the outlet is connected to the upper part of the dust removal tower (1); the induced draft section (3) comprises an induced draft fan (5), a wiping box (6) and a vibration box (7); the induced draft fan (5) is connected to the induced draft duct (2); the wiping box (6) and the vibration box (7) are arranged on the induced draft duct (2) on both sides of the induced draft fan (5) and are connected to the induced draft duct (2); tracks (8) are provided on the inner walls of the wiping box (6) and the vibration box (7); The track (8) is inclined downward in the direction of the location of the induced draft fan (5), and the bottom is horizontal; a working block (9) is movably connected to the track (8); an operating rod (10) is provided at the top of the working block (9); two groups of operating rods (10) respectively pass through the wiping box (6) and the vibration induction box (7) upward; a cleaning brush (11) is provided on the working block (9) in the wiping box (6); a rubber block (12) is provided on the working block (9) in the vibration induction box (7); an air inlet (14) is provided at the lower part of the dust removal tower (1), and a guide column (15) is provided inside; A valve I (18) is provided on the air induced air pipe (2) after the air induced air section (3), and a dust exhaust pipe (19) is connected in front of the valve I (18); a valve II (20) is provided at the inlet of the dust exhaust pipe (19); the dust exhaust pipe (19) is in communication with the inlet of the dust settling section (4); A spray coil (21) is provided at the upper portion of the dust removal tower (1); the ash settling section (4) comprises an ash settling box I (16) and an ash settling box II (17) which are connected in sequence via pipelines; an outlet of the ash settling box II (17) is connected to the spray coil (21) via a pipeline.

2. The water film dust collector capable of online cleaning of induced draft fans according to claim 1, characterized in that: The cleaning brush (11) is composed of plastic bristles and sponge blocks arranged in a mixed manner.

3. The water film dust collector capable of online cleaning of induced draft fans according to claim 1, characterized in that: The rubber block (12) has a wear-resistant rubber exterior and a spring (23) inside.

4. The water film dust collector capable of online cleaning of induced draft fans according to claim 1, characterized in that: An automatically returning sealing door (13) is hingedly connected at the connection portion between the wiping box (6) and the vibration inducing box (7) and the air inducing duct (2).

5. The water film dust collector capable of online cleaning of induced draft fans according to claim 1, characterized in that: Observation ports (22) are provided on the induced draft pipes (2) connected to both sides of the induced draft fan (5).

6. A method for using a water film dust collector capable of online cleaning of an induced draft fan according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) Dust removal in the tower: The gas containing smoke and dust discharged from the general boiler equipment is sprayed into the dust removal tower (1) from the air inlet (14) in an inclined direction under the action of the induced draft fan (5), and finally spirals up along the inner wall of the dust removal tower (1); water falls from the upper part of the dust removal tower (1), taking away most of the smoke and dust, and then falls into the dust settling section (4); the water after being precipitated in the dust settling section (4) enters the upper part of the dust removal tower (1) again, forming circulating water, and continues to remove dust; 2) Wiping and dust removal of the fan: reduce the speed of the induced draft fan (5) without stopping the fan; reduce or close valve I (18) and open valve II (20); push the operating rod (10) on the wiping box (6) toward the induced draft fan (5), and the working block (9) will move diagonally downward along the track (8); after the working block (9) reaches the horizontal position at the bottom of the track (8), slowly push the operating rod (10) so that the cleaning brush (11) gradually approaches the blades of the induced draft fan (5) and finally inserts into the gap between the blades; as the blades of the induced draft fan (5) rotate, the cleaning brush (11) wipes the dust off the blades; 3) Fan shaking off dust removal: reduce the speed of the induced draft fan (5) but do not stop the machine; reduce or close valve I (18) and open valve II (20); push the operating lever (10) on the induced vibration box (7) toward the induced draft fan (5), and the working block (9) will move diagonally downward along the track (8); after the working block (9) reaches the horizontal position at the bottom of the track (8), slowly push the operating lever (10) so that the rubber block (12) slowly touches the blades of the induced draft fan (5); when the blades rotate, they touch the rubber block (12), causing the blades to slightly deform and then quickly recover. During this process, the blades vibrate and the dust accumulated on the blades is shaken off; 4) Dust recovery: The airflow carries the dust cleaned from the blades of the induced draft fan (5) into the dust exhaust pipe (19), and then mixes with the sewage flowing down from the bottom of the dust removal tower (1) and enters the dust settling section (4) for sedimentation. After the fan wiping dust removal and fan shaking dust removal are completed, the dust exhaust pipe (19) is continuously ventilated for at least three minutes, and then valve I (18) is opened, valve II (20) is closed, and the normal operating speed of the induced draft fan (5) is restored.

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