WO2016029333A1

WO2016029333A1 - Embedded-type electrified bag composite dust collector

Info

Publication number: WO2016029333A1
Application number: PCT/CN2014/076862
Authority: WO
Inventors: 章荣发; 卢乾东; 李良芳; 丘佳锐; 王艳媛; 苏可美; 章潮鸿; 邱小龙; 李瑰萍; 林志祥; 陈良锦
Original assignee: 福建东源环保有限公司
Priority date: 2013-05-07
Filing date: 2014-05-06
Publication date: 2016-03-03
Also published as: CN103203156A; CN103203156B

Abstract

An embedded-type electrified bag composite dust collector, including, arranged sequentially from front to back in a housing (2), a front-stage electric field dust-collection area and an embedded-type electrified bag composite dust-collection area; within the embedded-type electrified bag composite dust-collection area, two sides of each rear-stage discharge electrode frame (5) are provided with a dust-receiving aperture plate (4) or with a row of dust-receiving aperture plates (4), the space between said two dust-receiving aperture plates (4) or two rows of dust-receiving aperture plates (4) being a rear-stage electric field channel; a filter bag group, comprising at least one filter bag (6), is provided between any two neighboring rear-stage electric field channels; the ventilation apertures of the dust-receiving aperture plates (4) act, within the rear-stage electric field channels, as airflow pathways leading flue gas into the filter bag groups. Because the height of the dust-receiving aperture plates (4) and the height of the rear-stage electric field channels (51) normally exceed the length of the filter bags (6) in the filter bag groups by approximately four meters, a large amount of dust can be collected in the lower side of the filter bag groups, further increasing the dust collection efficacy of the dust collector and extending the service life of the filter bag.

Description

Embedded electric bag composite dust collector

Technical field

The invention relates to the field of industrial dust removal, in particular to an embedded electric bag composite dust collector.

Background technique

In the fields of thermal power generation, building materials production and metallurgy, industrial dust collectors are widely used to capture dust in flue gas to reduce the concentration of PM2.5 in the atmosphere, thereby improving the quality of the atmospheric environment and protecting human health. At present, the electric bag composite dust collector is a commonly used industrial dust collector. In the 1990s, the Center for Energy and Environmental Research (EERC) of the University of North Dakota developed an integrated electric bag composite dust removal technology to prevent most of the secondary dust generated by any row of filter bags from being dusted by adjacent filter bags. Or adsorb it again. The inventor of the U.S. Patent Application Serial No. 09/813,497 entitled "Advanced hybrid particulate collector and method of operation" provides an embedded electric bag composite dust remover. The main feature of the dust collector is that two rows of dust collecting holes 4a having vent holes are embedded between any two adjacent rows of filter bags 6a, and a row of electricity is arranged between the two rows of dust collecting plates 4a. The halo line 51a forms an embedded electric bag composite dust removal area, see Figure 1. The embedded electric bag composite dust removing area includes an electric field dust removing area and a filter bag dust removing area. The dusty flue gas is first removed from most of the dust in the electric field dedusting zone, and then enters the filter bag dust removal zone through the vent hole on the dust collecting orifice 4a, and then filtered by the filter bag 6a. In the embedded electric bag composite dust removing area, a part of the secondary dust generated by the cleaning of each of the filter bags 6a can be trapped by the dust collecting plate 4a, thereby greatly reducing the secondary a possibility that the dust is again attached to the row of filter bags 6a that has just been cleaned, and a part of the secondary dust generated when the dust collecting plate 4a of each row is cleaned can be combined with the dust collecting plate. The adjacent filter bag 6a of 4a is adsorbed; and the charged dust carried by the flue gas entering the dust removing area of the filter bag is adsorbed by the filter bag 6a with a large amount of charge (because it migrates to the filter) The distance traveled by the bag 6a is short, so that the amount of charge lost during the migration process is small, so that the dust layer deposited on the surface of the filter bag 6a is relatively bulky, so that the filter bag filter wind speed is allowed to be as high as 3.0 m/min. The embedded electric bag composite dust collector has the advantages of high dust removal efficiency, high filter bag wind speed, small equipment volume, long filter bag cleaning cycle and long service life of the filter bag. Please refer to the selection and installation management of the electrostatic precipitator. One book (Li Edited at the time, China Electric Power Press, published in June 2005, pp. 135-136).

As shown in Fig. 2 and Fig. 3, in the case where the flue gas parameters of the precipitator inlet are unchanged, the pre-stage dust collecting plate 7b is added (note: there is no vent hole on the electrode plate), and the pair of pre-stages are added. A plurality of corona wires 51b are arranged between the dust plates 7b, which can increase the specific dust collecting area of the embedded electric bag composite dust collector, thereby improving the dust removing efficiency of the electric field dust removing area and reducing the inlet flue gas of the filter bag dust removing area. Dust concentration; then, we can extend the filter bag cleaning cycle. In this way, on the one hand, the amount of dust that passes through the filter material due to the cleaning of the filter bag can be reduced, thereby improving the dust removal efficiency of the embedded electric bag composite dust collector, and on the other hand, the service life of the filter bag can be prolonged, please refer to the master degree written by Xu Qing. The 71st to 76th pages of the dissertation "Development and Engineering Design of Electrostatic Bags Closely Mixed Dedusting Technology". It should be noted that, on each row of the dust collecting plate 4b, the gap between any two adjacent pieces of the dust collecting plate 4b is also an air flow path of the pre-dusting flue gas entering the dust removing area of the filter bag.

As shown in Fig. 2, only six rows of corona are provided between the twelve rows of pre-stage dust collecting plates 7b (note: four plates each having four plates 7b and ten rows each having three plates 7b). Line 51b (Note: there are seven corona lines 51b in each row), so the twelve rows of pre-stage dust collecting plates 7b added can only collect dust on one side. In other words, the twelve rows of the front stage dust collecting plates 7 and the six rows of corona wires 51b form six front stage electric field channels. It can be seen that in the space between the two rows of the front-stage dust collecting plates 7b which are furthest apart, only about 55% of the space volume is used for electrostatic dust removal.

In addition, as the specification of the embedded electric bag composite dust collector increases, the height of the front stage dust collecting plate 7b can reach 15 meters, and the length of the filter bag 6b in the filter bag group is generally 6 meters to 9 meters. The maximum length of the meter is 10 meters, and the height of the dust collecting plate 4b is substantially equal to the length of the filter bag 6b, so the space between the embedded electric bag composite dust removing area and the ash hopper is quite large. In this large space, neither the corona pole nor the dust collecting pole is provided, so that the dust concentration of the inlet flue gas in the dust removing area of the filter bag is significantly higher than when the corona pole and the dust collecting pole are provided, so it is necessary to set A relatively short filter bag cleaning cycle, which in turn leads to a decrease in dust removal efficiency and a shortened filter bag life.

According to the above analysis, the existing large-scale embedded electric bag composite dust collector has the disadvantage of relatively low space utilization.

Summary of the invention

The object of the present invention is to provide an embedded electric bag composite dust remover with relatively high space utilization rate. The embedded electric bag composite dust collector can greatly reduce the dust concentration of the inlet flue gas in the filter bag dust removal area, so the filter bag cleaning cycle can be appropriately extended to improve the dust removal efficiency of the dust collector and prolong the service life of the filter bag. , saving energy consumption of cleaning and reducing the operating cost of the dust collector.

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

An embedded electric bag composite dust remover comprises a casing (2) and a front-stage electric field dust-removing zone and an embedded electric bag composite dust-removing zone disposed in the casing (2) from the front to the rear; the front-stage electric field dust-removing zone The utility model comprises a plurality of pre-stage corona pole frames (8) and a plurality of pre-stage dust collecting plates (7) or a plurality of pre-stage dust collecting plates (7); the embedded electric bag composite dedusting zone comprises a rear-stage electric field dedusting zone And the filter bag dust removal zone; the rear stage electric field dust removal zone comprises a plurality of post-stage corona pole frames (5) and a plurality of dust collecting orifice plates (4) or a plurality of rows of dust collecting holes plates (4), each of which The rear corona pole frame (5) is provided with a plurality of rear corona wires (51); the filter bag dust removing region comprises a plurality of filter bag groups; each of the rear corona pole frames (5) The side is provided with a dust collecting plate (4) or a row of dust collecting plate (4), and the space between the two dust collecting plates (4) or the two rows of dust collecting plates (4) is a rear stage. An electric field channel; a filter bag group is disposed between the two adjacent second-stage electric field channels, and each filter bag group includes at least one row of filter bags (6); each of the filter bags 6) parallel or substantially parallel to the subsequent electric field channel; the vent hole disposed on the dust collecting plate (4) is the flue gas in the rear electric field channel entering the filter bag dust removing area Air flow path; the height of the dust collecting plate (4) and the height of the rear corona wire (51) are at least two meters larger than the length of the filter bag (6) in the filter bag group to utilize the filter The space under the bag group is electrostatically dusted.

Preferably, the upper and middle portions of the dust collecting plate (4) are provided with a plurality of vent holes, and the lower portion of the dust collecting plate (4) is provided with no vent holes to increase the dust collecting plate ( 4) The dust collection area.

Preferably, the vent hole has a circular shape or a rectangular shape or a triangular shape.

Preferably, each row of the dust collecting plate (4) comprises at least two pieces of dust collecting holes (4); the windproof groove side of the dust collecting plate (4) faces the dust collecting plate (4) An adjacent one-stage corona pole frame (5) is provided to facilitate the dust collecting plate (4) of the pieces to capture dust entering the electric field passage in the rear stage and reduce secondary dust.

Preferably, a gap between the adjacent two pieces of dust collecting holes (4) is greater than or equal to 30 mm; part of the flue gas of the upper and middle portions of the rear electric field channel may pass through the adjacent dust collecting plate ( 4) The gap between the filters enters the filter bag dust removal zone.

Preferably, the flat portion in the middle of the dust collecting plate (4) is provided with at least one concave and convex groove to strengthen the rigidity of the dust collecting plate (4).

Preferably, the height of the dust collecting plate (4) is equal to or close to the height of the front stage dust collecting plate (7), and the height of the rear stage corona wire (51) is equal to or close to that of the front stage. The height of the front corona wire (81) on the corona pole frame (8) is such that the space under the filter bag group is utilized to perform electrostatic dust removal.

Preferably, an auxiliary corona pole frame (26) is disposed directly below each row of filter bags (6) adjacent to the dust collecting plate; each of the auxiliary corona pole frames (26) is provided a plurality of auxiliary corona wires (261); the auxiliary corona pole frame (26) is parallel to the rear corona pole frame (5) and the dust collecting orifice plate (4) so as to utilize the The lower part of the dust collecting plate (4) is double-sided dust collecting.

Preferably, each of the filter bag sets is provided with a wind deflector (25) to reduce the airflow rising speed at the bottom of the filter bag dust removal zone; the wind deflector (25) has a cross section in a cross shape Or L-shaped or V-shaped.

Preferably, the front stage electric field dedusting area and the rear stage electric field dedusting area are both high frequency and high voltage power sources.

In an embedded electric bag composite dust collector provided by the present inventors, the height of the dust collecting plate and the height of the rear corona wire are at least two meters larger than the length of the filter bag in the filter bag group. The electrostatic dust is removed by using the space below the filter bag group (including collecting part of the dust falling when the filter bag is cleaned), thereby reducing the dust concentration of the inlet flue gas in the filter bag dust removal zone. Since the dust concentration of the inlet flue gas in the dust removal area of the filter bag has been greatly reduced, the filter bag cleaning cycle can be appropriately extended to improve the dust removal efficiency of the dust collector, prolong the service life of the filter bag, and save energy consumption for cleaning. And reduce the operating cost of the dust collector.

In addition, since most of the charged dust will flow out from the rear-stage electric field passage with the airflow, the distance traveled to the surface of the filter bag is relatively short, so the dust has more electric charge and is formed on the surface of the filter bag. Comparing the fluffy dust layer greatly reduces the drag coefficient of the flue gas passing through the filter bag, thereby reducing the wear rate of the filter material and the resistance of the dust removal system, and allowing a higher filter bag to filter the wind speed.

In a further embodiment, in an embedded electric bag composite dust collector provided by the present inventors, each of the rows of dust collecting holes comprises at least two pieces of dust collecting holes; and the dust collecting plate is windproof The groove side faces the one-stage corona pole frame adjacent to the dust collecting hole plate, so as to facilitate the dust collecting holes of the pieces to enter the electric field channel of the rear stage and reduce the secondary Dust. Therefore, we can extend the filter bag cleaning cycle a little longer, thereby further improving the dust removal efficiency of the dust collector, prolonging the life of the filter bag, saving the dust consumption and reducing the operating cost of the dust collector.

DRAWINGS

1 is a top plan view of a typical embedded electric bag composite dust remover;

2 is a top plan view of an embedded electric bag composite dust remover with a front stage dust collecting plate;

3 is a schematic structural view of the embedded electric bag composite dust remover shown in FIG. 2;

Figure 4 is a schematic structural view of a first embodiment of the present invention;

Figure 5 is a top plan view of the embedded electric bag composite dust remover shown in Figure 4;

Figure 6 is a view in the direction of arrow A in Figure 4 (removing the rapping device of the post-stage corona pole and the rear-stage dust collecting electrode);

7 is a schematic structural view of a rear-stage corona pole frame in a first embodiment of the present invention;

Figure 8 is a schematic structural view of a second embodiment of the present invention;

Figure 9 is a B-direction view of Figure 8 (a rapping device for removing the two electrodes of the rear stage corona pole and the rear stage dust collecting pole);

Figure 10 is a cross-sectional view showing the lower portion of the dust collecting plate in the first embodiment of the present invention;

Figure 11 is a schematic view showing the arrangement of circular vent holes on the dust collecting plate in the first embodiment of the present invention;

Figure 12 is a schematic view showing the shape of a vent hole on the dust collecting plate of the present invention;

Figure 13 is a schematic view showing the shape of a vent hole on the dust collecting plate of the present invention;

Figure 14 is a schematic view showing the shape of a vent hole on the dust collecting plate of the present invention;

Figure 15 is a schematic view showing the shape of a vent hole on the dust collecting plate of the present invention.

The symbols in the figure indicate:

Intake air box 1, 1a, 1b;

housings

2, 2a, 2b; V-shaped

baffles

3, 3a, 3b, 3c;

dust collecting plates

4, 4a, 4b; rear corona pole frame 5; Corona wire 51;

corona pole frame

5a, 5b;

corona wire

51a, 51b;

filter bag

6, 6a, 6b; front stage

dust collecting plate

7, 7b; front stage corona pole frame 8; Line 81; front stage corona pole-proof frame 9; ash hopper 10; spoiler 11; clean air chamber 12; outlet flue 13; filter bag cleaning device 14; poppet valve device 15; insulating sleeve 16; Room 17; housing top beam 18; rear stage corona pole suspension rod 19; rear stage corona pole suspension beam 20; rear stage corona pole anti-swing frame 21; rear stage corona pole upper anvil 22; Stage corona pole bottom vibrating anvil 23; rear stage dust collecting pole vibrating anvil 24; wind deflector 25; auxiliary corona pole frame 26; auxiliary corona wire 261; auxiliary corona pole suspension rod 27; auxiliary corona The pole lifting beam 28; the auxiliary corona poleing anvil 29.

detailed description

In order to make the technical solutions better understood by those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

First embodiment

As shown in FIG. 4 to FIG. 7 , an embedded electric bag composite dust remover provided by the present invention comprises a casing 2 and a front-stage electric field dust-removing zone and an embedded electric bag composite which are arranged in the casing 2 from the front to the rear. a dust removal zone; the front stage electric field dedusting zone is equipped with a high frequency high voltage power supply (not shown), a set of pre-stage dust collecting rapping device and a set of pre-stage dust collecting rapping device; The electric field dedusting zone comprises sixteen rows of pre-stage dust collecting plates 7 and fifteen pieces of front-stage corona pole frames 8 provided with front-stage corona wires 81, so that the front-stage dust collecting plates 7 can be double-sidedly dust-removed, thereby being remarkable The dust concentration of the inlet flue gas in the composite dust removal zone of the embedded electric bag is reduced.

The distance between the adjacent two rows of front stage dust collecting plates 7 is 400 mm. Each of the pre-stage dust collecting plates 7 comprises eight pre-stage dust collecting plates 7 having a height of 14.5 meters, and eight pre-stage dust collecting plates 7 are equally divided into two groups, each set being mounted on one plate row. Each of the front-stage corona pole frames 8 includes two pre-corona minimal frames having identical structures; each of the front-stage corona mini-frames is provided with eight front-level corona wires 81; The height H ₁ of the front corona wire 81 has reached 14.1 meters (H ₁ = 14.1 meters), so that the front corona wire 81 is easy to shake and bend, so each front corona wire 81 is divided into six segments, and Installed on the front stage corona minimal frame; the six-stage front stage corona line is substantially on the same vertical line.

The embedded electric bag composite dust removing area comprises a rear stage electric field dust removing area and a filter bag dust removing area. The post-stage electric field dedusting zone is equipped with a high-frequency high-voltage power source (not shown), a set of rear-stage dust collecting pole rapping device and two sets of post-stage corona pole rapping devices; the latter electric field dedusting zone The utility model comprises a 16-row dust collecting plate 4 and eight rear corona pole frames 5 provided with a rear corona wire 51; each of the rear corona pole frames 5 is provided with a row of dust collecting holes 4 on both sides thereof, The space between the two rows of dust collecting plates 4 is a rear electric field channel (note: the channel width is 400 mm); a filter bag group is disposed between the adjacent two adjacent rear electric field channels. The distance between the two rows of dust collecting plates 4 on each side of each filter bag group is 400 mm; each filter bag group includes a row of sixteen filters having a length of 10 meters and a diameter of 160 mm. a bag 6; each of the filter bags 6 is parallel or substantially parallel to the rear electric field channel; the vent hole on the dust collecting plate 4 is the flue gas in the electric field channel of the rear stage entering the filter Airflow path in the dust removal area of the bag.

Each row of the dust collecting plate 4 comprises eight pieces of the dust collecting plate 4 having a height of 15.0 meters, and the eight pieces of the dust collecting plate 4 are mounted on the same row of the collecting holes. The lower part of each of the dust collecting plate rows is provided with a rear stage dust collecting pole vibrating anvil 24 for vibrating and cleaning the dust collecting hole plate 4 through a set of rear stage dust collecting pole rapping device. In addition, as can be seen from FIG. 10 and FIG. 11, the flat portion in the middle of the dust collecting plate 4 is further provided with a concave-convex groove to reinforce the rigidity of the dust collecting plate 4.

The respective rear stage corona pole frames 5 are hung on the rear stage corona pole beam 20, and the lower portion thereof is connected to the rear stage corona pole anti-swing frame 21. The rear stage corona pole beam 20 is connected to the insulating sleeve 16 through the rear stage corona pole beam 19, the back nut and the support cover.

In fact, each of the rear stage corona pole frames 5 comprises two rear-stage corona mini-frames and six-piece coupling blocks having substantially the same structure; the two-piece rear-stage corona mini-frames are each provided with six The corona wire 51; because the height H ₂ of the rear corona wire 51 has reached 14.4 meters (H ₂ = 14.4 meters), so that the rear corona wire 51 is easy to sway and bend, so each post-level corona The line 51 is divided into six sections and mounted on the rear stage corona minimal frame; the six-stage rear stage corona line is substantially on the same vertical line. The two-stage rear-stage corona mini-frame and the six-piece coupling block are integrally joined by welding, wherein one side of the rear-stage corona minimal frame is provided with a rear-stage corona pole upper vibrating anvil 22 and a The post-stage corona pole lowers the anvil 23 to vibrate the rear corona pole frame 5 through two sets of post-stage corona pole rapping devices.

The flue gas enters the pre-stage electric field dedusting zone in the casing 2 from the intake case 1. Since the front stage dust collecting plate 7 can collect dust on both sides, the flue gas can be removed from most of the dust in the front stage electric field dust removing area. Then, under the guidance of the V-shaped baffle 3, most of the flue gas located in the upper and middle portions of the pre-stage electric field dedusting zone directly rushes into the upper and middle portions of the rear-stage electric field channel, and then in the flue gas Most of the dust is charged again in the electric field dedusting zone of the latter stage, and a part of the charged dust is deposited on the dust collecting plate 4 or the rear corona pole frame 5, and the remaining charged dust and the uncharged dust accompany the air flow. Passing through the vent hole on the dust collecting plate 4, entering the dust removing area of the filter bag provided with the seven filter bag groups; or first rushing out the dust-removing area of the embedded electric bag with the air flow, and then flowing upward with the air flow, Finally enter the top of the filter bag dust removal zone. A small portion of the flue gas located in the upper portion and the middle portion of the pre-stage electric field dust removing region directly enters the filter bag dust removing region through a gap between the V-shaped baffle plate 3 and the dust collecting orifice plate 4. The flue gas filtered through the filter bag 6 enters the clean room 12, and is discharged from the outlet flue 13 via the poppet valve device 15, and the dust originally in the flue gas is retained on the surface of the filter bag 6.

After removing most of the dust through the pre-stage electric field dedusting zone, under the guidance of the V-shaped baffle 3, most of the flue gas located in the lower part of the pre-stage electric field dedusting zone directly rushes into the lower part of the rear-stage electric field channel, wherein Most of the dust is charged again in the electric field dedusting zone of the latter stage, and a part of the charged dust is deposited on the dust collecting plate 4 or the rear corona pole frame 5, and the remaining charged dust and the uncharged dust accompany the air flow. Raising to the middle and upper portions of the electric field channel of the rear stage, and then entering the filter bag dust removal area along with the airflow through the vent hole on the dust collecting plate 4; or first flushing out the embedded electric bag dust removal area with the air flow, and then Then, it flows upwards with the airflow, and finally enters or passes through the vent hole on the dust collecting plate 4 to enter the dust removing area of the filter bag. a portion of the flue gas located in the lower portion of the pre-stage electric field dedusting zone passes through the gap between the lower portion of the V-shaped baffle 3 and the lower portion of the dust collecting plate 4 to enter the intake passage below the filter bag group ( Note: There are dust collecting holes 4 on both sides of the air inlet passage, but no corona wire is installed in the air intake passage, and then flow upwards and upwards, and enter through the gap between the wind shield 25 and the dust collecting plate 4. The filter bag dust removal zone. Each of the above-mentioned portions of the flue gas is filtered through the filter bag 6 and also enters the clean room 12, and is discharged from the outlet flue 13 via the poppet valve device 15, and the dust therein is retained on the surface of the filter bag 6.

After the dust collector is operated for a period of time, when the filter bag 6 adsorbs a relatively large amount of dust and the running resistance thereof rises to a certain extent, the filter bag cleaning device 14 must be activated to disengage the dust from the filter bag 6 surface.

Since the height of the dust collecting plate 4 and the height of the rear corona wire 51 are at least four meters longer than the length of the filter bag 6 in the filter bag group, the lower and rear corona poles of the dust collecting plate 4 The lower part of the frame 5 can capture a large amount of dust from the flue gas flowing under the filter bag group, including a part of the dust falling when the filter bag is cleaned, thereby greatly reducing the inlet smoke entering the filter bag dust removal zone. Dust concentration; then properly extend the filter bag cleaning cycle, which can improve the dust removal efficiency of the dust collector, extend the life of the filter bag, save energy consumption of cleaning and reduce the operating cost of the dust collector.

In addition, since most of the charged dust will flow out from the rear electric field passage with the air current, the distance traveled to the surface of the filter bag 6 is relatively short, so the dust has more electric charge, and in the filter bag 6 The surface forms a relatively fluffy dust layer, which greatly reduces the drag coefficient of the flue gas passing through the filter bag 6, thereby reducing the wear rate of the filter material and the resistance of the dust removal system, and allowing a higher filter bag to filter the wind speed.

It is worth mentioning that there are three points, one of which is provided with a plurality of vent holes in the upper and middle portions of the dust collecting plate 4, and no vent holes are provided in the lower portion of the dust collecting plate 4 to increase the dust collecting holes. See Figure 4 for the dust collection area of the board 4. The size symbol h in Fig. 4 is the height of the opening area of the dust collecting plate 4; the height h of the opening area is generally 0.6 to 0.8 times the height of the dust collecting plate 4. Second, the eight sets of dust collecting holes on each of the dust collecting plate rows are facing the rear corona pole frame 5 adjacent to the eight pieces of dust collecting holes 4, It is advantageous for the eight pieces of the dust collecting plate 4 to collect the dust entering the electric field channel of the latter stage and reduce the secondary dust. Third, each of the filter bag sets is provided with a wind deflector 25 to reduce the airflow rising speed at the bottom of the filter bag dust removal zone; the wind deflector 25 has a cross section in a straight shape; The cross section of the wind deflector 25 may also be changed to an L shape or a V shape.

It can be seen from the above analysis that the embedded electric bag composite dust remover provided by the present invention has not only the filter bag filter wind speed, the lower portion of the dust collecting plate 4 and the lower portion of the rear corona pole frame 5 can be in the filter bag. The characteristics of dust collection under the group, but also have the advantages of less secondary dust, long filter bag cleaning cycle, high dust removal efficiency, long filter bag service life and low operating cost.

In addition, three points need to be explained. First, the two rows of dust collecting plates 4 at the outermost side of the electric field dust removing area of the latter stage can be replaced with two rows of dust collecting plates without vent holes to increase the rear stage. The dust collection area of the electric field dust removal area. Second, on each of the rows of dust collecting plates 4, the gap between any two adjacent dust collecting plates 4 is equal to 30 mm; part of the flue gas flowing into the upper and middle portions of the electric field channel of the latter stage can pass through the gaps. Entering the dust collection area of the filter bag; and, in order to appropriately increase the dust collection area of the dust collecting plate 4, the gap between the adjacent two pieces of the dust collecting plate 4 can be expanded to 60 to 80 mm or even When it reaches 100 mm or more, the opening ratio of the dust collecting plate 4 is also correspondingly reduced, or even reduced to zero, that is, the dust collecting plate 4 has actually become - no vent hole Dust board. When the dust collecting plate 4 has been replaced by a dust collecting plate without a vent hole, the flue gas flowing into the upper and middle portions of the electric field passage of the rear stage is mainly passed through the two adjacent pieces of the dust collecting plate. The gap between them enters the filter bag dust removal zone.

Second Embodiment Further, in front of each row of the filter bags 6 in the first embodiment, an auxiliary corona pole frame 26 provided with fourteen auxiliary corona wires 261 is disposed, so that each row is dust-collected. A pair of rear-stage corona pole frames 5 and a piece of auxiliary corona pole frame 26 which are parallel to each other are respectively disposed on both sides of the lower portion of the orifice plate 4, so as to utilize the lower portions of the dust collecting orifice plates 4 for double-sided dust collection, thereby further To reduce the dust concentration of the inlet flue gas in the dust removal area of the filter bag, please refer to FIG. 8 and FIG. 9; and then extend the filter bag cleaning cycle to further improve the dust removal efficiency of the dust collector and extend the filter bag. Service life, saving energy consumption of cleaning and reducing the operating cost of the dust collector.

As shown in FIG. 8 and FIG. 9, one side of each of the auxiliary corona pole frames 26 is provided with an auxiliary corona pole anvil 29 for assisting corona through a set of rear corona pole rapping devices. The pole frame 26 is subjected to coring cleaning. Each of the auxiliary corona pole frames 26 is hung on the auxiliary corona pole beam 28, and the auxiliary corona pole beam 28 is suspended by the auxiliary corona pole suspension rod 27 on the rear corona pole beam 20. And the lower part of each auxiliary corona pole frame 26 is connected with the rear corona pole anti-swing frame 21.

It should be noted that the lower end of the V-shaped baffle 3c in the second embodiment is only a little lower than the bottom of the filter bag 6 in the filter bag group, so that the flue gas located in the lower part of the pre-stage electric field dedusting zone directly enters the place. The lower part of the electric field channel of the latter stage.

In addition, two points need to be explained. First, in order to improve the smoke processing capability of the embedded electric bag composite dust remover provided by the present invention, an embedded electric bag may be added behind the embedded electric bag composite dust removal area in the present invention. a composite dust removal zone and an internal maintenance walkway between the two embedded electric bag composite dust removal zones; two post-stage electric field dust removal zones each equipped with a high-frequency high-voltage power supply, or two post-stage electric fields through the wires After the rear-stage corona poles in the dust-removing zone are connected together, the two rear-stage electric field dust-removing zones share a high-frequency high-voltage power source. Of course, at the same time, the length of the casing 2 should be increased and some parts added. Second, the dust collecting plate in the present invention is rolled into a certain shape by a rolling mill, for example, rolled into a C-shaped plate, or a BE-shaped plate or a Z-shaped plate, and a vent hole is formed in the upper and middle portions of the plate. Made of.

Other unexplained portions referred to in the present invention are the same as in the prior art.

Claims

An embedded electric bag composite dust remover comprises a casing (2) and a front-stage electric field dust-removing zone and an embedded electric bag composite dust-removing zone disposed in the casing (2) from the front to the rear; the front-stage electric field dust-removing zone The utility model comprises a plurality of pre-stage corona pole frames (8) and a plurality of pre-stage dust collecting plates (7) or a plurality of pre-stage dust collecting plates (7); the embedded electric bag composite dedusting zone comprises a rear-stage electric field dedusting zone And the filter bag dust removal zone; the rear stage electric field dust removal zone comprises a plurality of post-stage corona pole frames (5) and a plurality of dust collecting orifice plates (4) or a plurality of rows of dust collecting holes plates (4), each of which The rear corona pole frame (5) is provided with a plurality of rear corona wires (51); the filter bag dust removing region comprises a plurality of filter bag groups; each of the rear corona pole frames (5) The side is provided with a dust collecting plate (4) or a row of dust collecting plate (4), and the space between the two dust collecting plates (4) or the two rows of dust collecting plates (4) is a rear stage. An electric field channel; a filter bag group is disposed between the two adjacent second-stage electric field channels, and each filter bag group includes at least one row of filter bags (6); each of the filter bags ( 6) Parallel or substantially Parallel to the electric field channel of the rear stage; the vent hole disposed on the dust collecting plate (4) is an air flow path of the flue gas in the electric field channel of the rear stage entering the dust removing area of the filter bag, wherein: The height of the dust collecting plate (4) and the height of the rear corona wire (51) are at least two meters larger than the length of the filter bag (6) in the filter bag group to utilize the filter bag group below The space is electrostatically dusted.
The embedded electric bag composite dust remover according to claim 1, wherein the upper and middle portions of the dust collecting plate (4) are provided with a plurality of vent holes, and the lower portion of the dust collecting plate (4) There is no vent hole to increase the dust collecting area of the dust collecting plate (4).
The embedded electric bag composite dust remover according to claim 2, wherein the vent hole has a circular shape or a rectangular shape or a triangular shape.
The embedded electric bag composite dust collector according to claim 1, wherein each of the rows of dust collecting holes (4) comprises at least two pieces of dust collecting holes (4); and the collecting holes (4) The windshield side faces the rear corona pole frame (5) adjacent to the dust collecting plate (4) to facilitate the collection of the dust collecting plate (4) The dust in the electric field channel of the latter stage is described and the secondary dust is reduced.
The embedded electric bag composite dust collector according to claim 4, wherein a gap between the adjacent two pieces of dust collecting holes (4) is greater than or equal to 30 mm; Part of the flue gas in the middle portion can enter the filter bag dust removal zone through the gap between the adjacent two pieces of dust collecting holes (4).
The embedded electric bag composite dust remover according to claim 4, wherein the flat portion in the middle of the dust collecting plate (4) is provided with at least one concave-convex groove to reinforce the dust collecting plate (4). ) Stiffness.
The embedded electric bag composite dust remover according to claim 4, wherein the height of the dust collecting plate (4) is equal to or close to the height of the front stage dust collecting plate (7), and the rear stage electric The halo line (51) has a height equal to or close to the height of the front corona wire (81) mounted on the front stage corona pole frame (8) in order to fully utilize the space below the filter bag set for electrostatic precipitator.
The embedded electric bag composite dust collector according to claim 1, characterized in that: an auxiliary corona is disposed directly under each of the filter bags (6) adjacent to the dust collecting plate (4) a pole frame (26); each of the auxiliary corona pole frames (26) is provided with a plurality of auxiliary corona wires (261); the auxiliary corona pole frame (26) and the rear corona pole frame (5) and the dust collecting plate (4) are parallel to each other so as to perform double-side dust collection by using the lower portion of the dust collecting plate (4).
The embedded electric bag composite dust remover according to claim 1, wherein each of the filter bag sets is provided with a wind deflector (25) to reduce the airflow rise at the bottom of the filter bag dust removal zone. Speed; the cross section of the wind deflector (25) is in a shape of a letter or an L shape or a V shape.
The embedded electric bag composite dust remover according to claim 1, wherein the front stage electric field dedusting area and the rear stage electric field dedusting area are both high frequency and high voltage power sources.