Pneumatic rapping flow-guiding dust collecting device for small unit at outlet of electric dust collector

Abstract

This invention discloses a pneumatic rapping and dust collection device for a small unit at the outlet of an electrostatic precipitator, comprising a top suspension mechanism, several dust collection units, several pneumatic rapping mechanisms, and several side suspension mechanisms. The dust collection mechanisms are suspended inside the upper end of the outlet of the electrostatic precipitator via the top suspension mechanism and the side suspension mechanism. Each dust collection unit is equipped with a pneumatic rapping mechanism. Compared with the prior art, this device offers better stability and dust removal effect, reduces secondary dust generation, avoids clogging problems, achieves efficient dust removal, is suitable for retrofitting existing electrostatic precipitators, and has good adaptability.

Description

[Technical Field]

[0001] This invention relates to the technical field of flue gas pollutant treatment, and in particular to the technical field of a pneumatic rapping and dust collection device for a small unit at the outlet of an electrostatic precipitator. [Background Technology]

[0002] Electrostatic precipitators are the mainstream technology for industrial flue gas dust removal. The dust concentration at the outlet of electrostatic precipitators has generally reached 15 mg / m3, and many have even reached below 10 mg / m3. Related studies have shown that secondary dust emission is the main reason why the dust concentration at the outlet of limit electrostatic precipitators exceeds 5 mg / m3.

[0003] With the advent of low-temperature electrostatic precipitators, the co-firing of sludge with coal, and the widespread burning of high-moisture and high-sulfur coal in my country due to changes in the global energy landscape, the adhesion of dust inside electrostatic precipitators has increased significantly, and the problem of dust sticking to the outlet airflow distribution plate has become increasingly serious.

[0004] The collection and cleaning of ultrafine dust at the tail end of electrostatic precipitators is one of the most troublesome problems in the dust removal field. It is the last line of defense and barrier, and the dust collection problem at the outlet funnel is the final obstacle in dust removal technology. Existing dust collection technologies using metal mesh suffer from high resistance, poor flow field uniformity, and high cost. Existing trough-shaped plates suffer from serious dust accumulation problems.

[0005] During the rapping cleaning process, small dust particles are easily carried away by the flue gas as the dust layer falls. This is especially true at the tail end of the electrostatic precipitator, where secondary dust generation is more severe. Currently, there is no technology on the market that can both efficiently clean dust and control secondary dust generation.

[0006] ZL202211708499.2 describes a multi-layer dust collection device for the outlet of an electrostatic precipitator. While this device improves dust removal efficiency by incorporating multiple trough-shaped dust collection units, the rapping device, located inside the electrostatic precipitator in a corrosive and dusty environment, suffers from issues such as wear and corrosion of its moving parts, insufficient stability, and a complex system consisting of rapping hammers, a geared motor, and multiple dust collection units, resulting in high equipment costs. Furthermore, the rapping direction is perpendicular to the plane of the dust collection unit, leading to poor rapping transmission and inadequate dust removal efficiency. [Summary of the Invention]

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a pneumatic rapping and dust collection device for a small unit at the outlet of an electrostatic precipitator, which can solve at least one of the above problems.

[0008] To achieve the above objectives, the present invention proposes a pneumatic rapping and dust collection device for a small unit at the outlet of an electrostatic precipitator, comprising a top suspension mechanism, several dust collection units, several pneumatic rapping mechanisms, and several side suspension mechanisms. The dust collection mechanisms are suspended inside the upper end of the outlet of the electrostatic precipitator through the top suspension mechanism and the side suspension mechanism, and each dust collection unit is equipped with a pneumatic rapping mechanism.

[0009] Preferably, the top suspension mechanism includes a suspension seat and a number of hooks arranged in a row on the suspension seat.

[0010] Preferably, the dust collection unit includes several trough-shaped plates, each with a hanging hole at its upper end, and a reinforcing plate I is provided on the upper end of each hanging hole trough-shaped plate.

[0011] Preferably, the reinforcing plate I includes a plate body, the upper end of which is bent downward to form an upper clamping hook that is clamped and fixed to the upper end of the grooved plate, and the lower end of which is bent upward to form a lower clamping hook that is clamped and fixed to the upper end of the hanging hole.

[0012] Preferably, the side suspension mechanism includes several connecting angle steels, several brackets and support rods. The connecting angle steels are installed on the corresponding dust collection units, and the support rods are equipped with brackets that are fixedly connected to the connecting angle steels.

[0013] Preferably, the bracket includes a slot and a support that is fixedly connected to the connecting angle steel.

[0014] Preferably, the channel plate is fixedly connected to the corresponding connecting angle steel by bolt pairs, and a reinforcing plate II is provided at the connection between the channel plate and the bolt pairs.

[0015] Preferably, the pneumatic rapping mechanism includes two clamping plates, a rapping anvil, and a pneumatic rapper. The two clamping plates are located on both sides of the dust collection unit and are fixedly connected to the dust collection unit by bolt pairs. A rapping anvil is provided on the clamping plate located on the bottom side of the groove plate, and a pneumatic rapper is provided on the rapping anvil. A reinforcing plate III corresponding to the clamping plate is provided in the groove plate. A support sleeve is fitted on the bolt pairs between the reinforcing plate III and the clamping plate on the groove opening side of the groove plate.

[0016] Preferably, the air inlet of the pneumatic vibrator is connected to the air supply pipe through an air inlet pipe that passes through the side wall of the electrostatic precipitator outlet. An electromagnetic valve is provided on the air inlet pipe outside the electrostatic precipitator outlet. The exhaust port of the pneumatic vibrator is connected to the outside through an exhaust pipe that passes through the side wall of the electrostatic precipitator outlet. Anti-deformation mechanisms are provided between the air inlet pipe and the exhaust pipe and the side wall of the electrostatic precipitator outlet.

[0017] Preferably, the anti-deformation mechanism includes a sleeve, a graphite packing, and two cover plates. The sleeve contains a graphite packing, and both ends of the sleeve are provided with annular cover plates.

[0018] The beneficial effects of the present invention are as follows: The dust collection mechanism is suspended in the upper part of the outlet of the electrostatic precipitator by the top suspension mechanism and the side suspension mechanism. Each dust collection unit is equipped with a pneumatic vibration mechanism. Compared with the prior art, it can achieve better stability and dust removal effect, reduce secondary dust and avoid clogging problems, achieve efficient dust removal, and is suitable for retrofitting existing electrostatic precipitators with good adaptability.

[0019] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. [Attached Image Description]

[0020] Figure 1 This is a schematic diagram of the structure of a pneumatic vibration and flow guiding dust collection device for a small unit at the outlet of an electrostatic precipitator according to the present invention;

[0021] Figure 2 This is a schematic diagram of the top suspension mechanism;

[0022] Figure 3 yes Figure 2 Sectional view of AA;

[0023] Figure 4 yes Figure 1 Enlarged view of A in the middle;

[0024] Figure 5 yes Figure 4 Enlarged view of B in the middle;

[0025] Figure 6 This is a schematic diagram of the pneumatic rapping mechanism installed on the dust collection unit;

[0026] Figure 7 This is a schematic diagram of the side suspension mechanism;

[0027] Figure 8 This is a structural schematic diagram of a channel plate;

[0028] Figure 9 yes Figure 8 Sectional view of AA.

[0029] In the diagram: 1-Top suspension mechanism, 2-Dust collection unit, 3-Pneumatic vibration mechanism, 4-Side suspension mechanism, 5-Electrostatic precipitator outlet, 6-Inlet pipe, 7-Air supply pipe, 8-Solenoid valve, 9-Exhaust pipe, 10-Anti-deformation mechanism, 11-Suspension seat, 12-Hook, 21-Channel plate, 22-Hanging hole, 23-Reinforcing plate I, 31-Clamping plate, 32-Vibrating anvil, 33-Pneumatic vibrator, 34-Reinforcing plate III, 35-Support sleeve, 41-Connecting angle steel, 42-Hanging bracket, 43-Support rod, 231-Plate body, 232-Upper clamping hook, 233-Lower clamping hook, 421-Card slot body, 422-Support, 101-Pipe sleeve, 102-Graphite packing, 103-Cover plate.

Detailed Implementation Methods

[0030] See Figure 1 The present invention provides a pneumatic vibration and flow guiding dust collection device for a small unit at the outlet of an electrostatic precipitator, comprising a top suspension mechanism 1, several dust collection units 2, several pneumatic vibration mechanisms 3, and several side suspension mechanisms 4. The dust collection mechanisms 2 are suspended inside the upper end of the outlet 5 of the electrostatic precipitator through the top suspension mechanism 1 and the side suspension mechanisms 4. Each dust collection unit 2 is provided with a pneumatic vibration mechanism 3.

[0031] See Figure 2 , 3 The top suspension mechanism 1 includes a suspension seat 11 and a plurality of hooks 12 arranged in a row on the suspension seat 11.

[0032] See Figure 8 , 9 The dust collection unit 2 includes several trough-shaped plates 21. Each trough-shaped plate 21 has a hanging hole 22 at its upper end. Each trough-shaped plate 21 above the hanging hole 22 is provided with a reinforcing plate I23. The reinforcing plate I23 includes a plate body 231. The upper end of the plate body 231 is bent downward to form an upper clamping hook 232 that is clamped and fixed to the upper end of the trough-shaped plate 21. The lower end of the plate body 231 is bent upward to form a lower clamping hook 233 that is clamped and fixed to the upper end of the hanging hole 22.

[0033] See Figure 7 The side suspension mechanism 4 includes several connecting angle steels 41, several hanging brackets 42 and support rods 43. The connecting angle steels 41 are installed on the corresponding dust collection units 2. The support rods 43 are equipped with hanging brackets 42 that are fixedly connected to the connecting angle steels 41. The hanging brackets 42 include a slot body 421 and a support 422 that is fixedly connected to the connecting angle steels 41.

[0034] See Figure 7 , 8 The channel plate 21 is fixedly connected to the corresponding connecting angle steel 41 by bolt pairs, and a reinforcing plate II23 is provided at the connection between the channel plate 21 and the bolt pairs.

[0035] See Figure 6 The pneumatic vibration mechanism 3 includes two clamping plates 31, a vibration anvil 32, and a pneumatic vibrator 33. The two clamping plates 31 are located on both sides of the dust collection unit 2 and are fixedly connected to the dust collection unit 2 by bolt pairs. The clamping plate 31 located on the bottom side of the groove plate 21 is provided with a vibration anvil 32, and the vibration anvil 32 is provided with a pneumatic vibrator 33. The groove plate 21 is provided with a reinforcing plate III 34 corresponding to the clamping plate 31. The bolt pairs between the reinforcing plate III 34 and the clamping plate 31 on the groove opening side of the groove plate 21 are all fitted with support sleeves 35.

[0036] See Figure 4 The air inlet of the pneumatic vibrator 33 is connected to the air supply pipe 7 through the air inlet pipe 6 that passes through the side wall of the electrostatic precipitator outlet 5. The air inlet pipe 6 outside the electrostatic precipitator outlet 5 is equipped with a solenoid valve 8. The exhaust port of the pneumatic vibrator 33 is connected to the outside through the exhaust pipe 9 that passes through the side wall of the electrostatic precipitator outlet 5. The air inlet pipe 6 and the exhaust pipe 9 are both provided with anti-deformation mechanisms 10 between them and the side wall of the electrostatic precipitator outlet 5.

[0037] See Figure 5 The anti-deformation mechanism 10 includes a sleeve 101, a graphite packing 102, and two cover plates 103. The sleeve 101 is provided with a graphite packing 102, and both ends of the sleeve 101 are provided with annular cover plates 103.

[0038] The dust collection unit 2 includes three trough-shaped plates 21. The three trough-shaped plates 21 are fixed together by connecting angle steel 41. The trough-shaped plates 21 are arranged in parallel with a gap of 50-100mm. Each connecting angle steel 41 is hung on the support rod 43 by two hangers 42. The hangers 42 are located in the corresponding gap.

[0039] The channel plate 21 is made of steel plate pressed into a channel shape. Two hanging holes 22 are provided at the upper end. The distance between the reinforcing plate III 34 and the lower end of the channel plate 21 is 200mm to 2000mm. The reinforcing plate III 34 is provided with through holes for bolt assembly installation and fixing. Bolt assembly fixing can avoid local failure caused by vibration and has better impact resistance and fatigue resistance than welding.

[0040] The hook 12 enables the suspension of the channel plate 21, effectively transmitting vibration acceleration during rapping and improving the cleaning effect. The locally installed reinforcing plate 123 enhances the equipment's wear resistance and vibration impact resistance, thereby improving its stability and service life.

[0041] The pneumatic rapping mechanism 3 is designed so that the rapping force is parallel to the channel plate, resulting in good force transmission and dust removal. Each dust collection unit 2 is equipped with one pneumatic rapping mechanism 3, enabling individual rapping and dust removal for each dust collection unit 2.

[0042] The anti-deformation mechanism 10 can prevent the deformation of the pipeline caused by the vibration and thermal deformation of the electrostatic precipitator, which would affect the transmission of compressed air. Both the air inlet pipe 6 and the air outlet pipe 9 are corrugated pipes that are connected to the air inlet and air outlet of the pneumatic vibrator 33 respectively, which can prevent the vibration of the pneumatic vibrator during vibration from affecting the pipeline and improve the stability of the pipeline.

[0043] A solenoid valve 8 is installed on the inlet pipe 6 outside the outlet 5 of the electrostatic precipitator. This design prevents live components and control cables from being routed into the flue gas, thereby improving equipment stability. The exhaust gas from the pneumatic vibrator 33 is led out of the electrostatic precipitator through the exhaust pipe 9, with the output end of the exhaust pipe 9 bent and the outlet facing downwards. This design prevents the exhaust gas from the pneumatic vibrator 33 from entering the electrostatic precipitator, causing a localized temperature drop and corrosion. It also prevents dust and corrosive gases in the flue gas from entering the pneumatic vibrator 33 through the outlet and damaging the equipment. The bent outlet with its downward-facing opening avoids the impact of the exhaust gas on maintenance personnel and prevents dust from entering the outlet pipe. Furthermore, when the exhaust pipe 9 passes through the lower side wall of the outlet 5 of the electrostatic precipitator, it avoids angle steel and channel steel reinforcement on site.

[0044] A shut-off valve and a filter pressure reducing valve are installed on the gas supply pipe 7 to control the gas pressure within the range of 0.3-0.7 MPa.

[0045] The pneumatic rapper 33 has an aluminum alloy shell. Internal components are heat-resistant up to 180℃. It features a sealed structure. Since the installation environment of the pneumatic rapper 33 is the flue gas inside an electrostatic precipitator, a dusty environment containing corrosive gases such as SO3, the use of aluminum alloy not only meets corrosion requirements but also satisfies the requirements for force transmission and bearing.

[0046] The air pipes are made of seamless 304 stainless steel. The pipe diameters are reduced after branching to accommodate different diameters. The air supply pipe 7 branches into two lines between the two electrostatic precipitators, each with a diameter of φ21×2.8. These lines then connect to each pneumatic vibrator 33 via an inlet pipe 6 with a diameter of φ8×1. This branching ensures uniform pressure and flow to each pneumatic vibrator, improving their operational stability.

[0047] The working process of this invention:

[0048] In the operation of the electrostatic precipitator outlet small unit pneumatic rapping and guiding dust collection device of the present invention, several dust collection units 2 are set in the electrostatic precipitator outlet 5 to re-collect secondary dust, especially charged escape dust can be effectively collected. Three grooved plates 21 are set as an independent dust collection unit 2, and a pneumatic rapping mechanism 3 is set to rap and clean each independent dust collection unit 2.

[0049] Its vibration control logic is as follows:

[0050] a. When the front electric field is used for rapping and cleaning in the same chamber, the dust collection unit 2 in the downstream electrostatic precipitator outlet 5 of the same chamber is not rapped, and the control logic is set to stagger the rapping and cleaning.

[0051] b. The dust collection units 2 inside all the outlets 5 of the electrostatic precipitator are not vibrated simultaneously.

[0052] c. The pneumatic vibrators 33 of the dust collection unit 2 within the same electrostatic precipitator outlet 5 do not vibrate simultaneously.

[0053] e. The interval of rapping can be set to a fixed time based on the dust collection situation, or differential pressure gauges can be installed before and after the rapping can be performed when the set differential pressure value reaches a certain limit.

[0054] The above settings can prevent secondary dust generation caused by simultaneous vibration.

[0055] A 600MW unit is equipped with two electrostatic precipitators, totaling four outlet horns. Each horn is equipped with ten vibrators. The cost comparison is as follows:

[0056] Conventional mechanical vibration:

[0057] Vibratory hammer: 50 hammers × 200 yuan / hammer = 10,000 yuan;

[0058] Steel structure for the vibratory hammer, including drive shaft, bracket, bearings, and geared motor bracket: 30 tons, calculated at 10,000 RMB / ton for materials, processing, and transportation, totaling 300,000 RMB.

[0059] Gear motor: 10,000 yuan × 4 sets of motors = 40,000 yuan;

[0060] Total rated energy consumption: 0.37kW × 4 sets of motors = 1.48kW

[0061] Total cost: 350,000 yuan; Power consumption: 1.48 kW

[0062] This invention features pneumatic vibration:

[0063] 50 pneumatic vibrators × 800 yuan / each = 40,000 yuan;

[0064] Pneumatic transmission pipeline: 0.2 tons, 0.2 million

[0065] Solenoid valves and filter pressure reducing valves: 50 units × 200 yuan / unit = 10,000 yuan;

[0066] Supports, etc.: 2 tons × 10,000 yuan / ton = 20,000 yuan

[0067] Compressed air plant instruments consume almost no electricity; only compressed air plant instruments consume air.

[0068] Total cost: 72,000 yuan; Power consumption: 0 kW

[0069] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A pneumatic rapping and dust collection device for a small unit at the outlet of an electrostatic precipitator, characterized in that: The device includes a top suspension mechanism (1), several dust collection units (2), several pneumatic vibration mechanisms (3), and several side suspension mechanisms (4). The dust collection units (2) are suspended above the outlet (5) of the electrostatic precipitator via the top suspension mechanism (1) and the side suspension mechanisms (4). Each dust collection unit (2) is equipped with a pneumatic vibration mechanism (3). The side suspension mechanism (4) includes several connecting angle steels (41), several brackets (42), and support rods (43). The connecting angle steels (41) are mounted on the corresponding dust collection units (2), and the support rods (43) are equipped with brackets fixed to the connecting angle steels (41). The connecting bracket (42) includes a slot body (421) and a support (422) fixedly connected to the connecting angle steel (41). The channel plate (21) of the dust collection unit (2) is fixedly connected to the corresponding connecting angle steel (41) by bolt pairs. A reinforcing plate II (23) is provided at the connection between the channel plate (21) and the bolt pairs. The pneumatic vibration mechanism (3) includes two clamping plates (31), a vibration anvil (32) and a pneumatic vibrator (33). The two clamping plates (31) are located on both sides of the dust collection unit (2) and fixedly connected to the dust collection unit (2) by bolt pairs. Connected together, a vibrating anvil (32) is provided on the clamping plate (31) located on the bottom side of the groove of the groove plate (21). A pneumatic vibrator (33) is provided on the vibrating anvil (32). A reinforcing plate III (34) corresponding to the clamping plate (31) is provided in the groove plate (21). A support sleeve (35) is provided on the bolt pair between the reinforcing plate III (34) and the clamping plate (31) on the groove opening side of the groove plate (21). The air inlet of the pneumatic vibrator (33) is connected to the air supply pipe (7) through the air inlet pipe (6) passing through the side wall of the electrostatic precipitator outlet (5). An electromagnetic valve (8) is provided on the air inlet pipe (6) outside the dust collector outlet (5). The exhaust port of the pneumatic vibrator (33) is connected to the outside through the exhaust pipe (9) that passes through the side wall of the electrostatic precipitator outlet (5). An anti-deformation mechanism (10) is provided between the air inlet pipe (6) and the exhaust pipe (9) and the side wall of the electrostatic precipitator outlet (5). The anti-deformation mechanism (10) includes a sleeve (101), a graphite packing (102) and two cover plates (103). The sleeve (101) is provided with a graphite packing (102), and both ends of the sleeve (101) are provided with annular cover plates (103).

2. The pneumatic vibration and dust collection device for a small unit at the outlet of an electrostatic precipitator as described in claim 1, characterized in that: The top suspension mechanism (1) includes a suspension seat (11) and a number of hooks (12) arranged in a row on the suspension seat (11).

3. The pneumatic vibration and dust collection device for a small unit at the outlet of an electrostatic precipitator as described in claim 1, characterized in that: The dust collection unit (2) includes several trough plates (21), each of which has a hanging hole (22) at its upper end, and a reinforcing plate I (23) is provided on the upper end of the trough plate (21) above the hanging hole (22).

4. The pneumatic vibration and dust collection device for a small unit at the outlet of an electrostatic precipitator as described in claim 3, characterized in that: The reinforcing plate I (23) includes a plate body (231), the upper end of the plate body (231) is bent downward to form an upper clamping hook (232) that is clamped and fixed to the upper end of the groove plate (21), and the lower end of the plate body (231) is bent upward to form a lower clamping hook (233) that is clamped and fixed to the upper end of the hanging hole (22).

Images