CN216136870U

CN216136870U - Low-pressure long-bag pulse dust collector and dust removal system

Info

Publication number: CN216136870U
Application number: CN202122056930.7U
Authority: CN
Inventors: 杨来运; 张泽林
Original assignee: Jiang Xian Xingyuan Technology Co ltd
Current assignee: Jiang Xian Xingyuan Technology Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-03-29
Anticipated expiration: 2031-08-30

Abstract

The utility model relates to the technical field of dust removing equipment, and particularly discloses a low-pressure long-bag pulse dust remover, which comprises: the device comprises a shell, a perforated plate, a plurality of filter bags and a plurality of injection units, wherein each row or each column of through holes on the perforated plate is correspondingly provided with one injection unit, and each injection unit comprises two control parts and two injection pipes; the part of each blowing pipe, which is positioned in the clean air cavity, is provided with a blowing hole opposite to the through hole formed in the porous plate; the control component is used for controlling compressed gas entering the corresponding injection pipe, and the compressed gas is used for injecting the filter bag through each injection hole. The low-pressure long-bag pulse dust collector and the dust collection system provided by the utility model have the advantages that the air pressure difference at the head and tail ejection holes of the ejection tube is reduced, the accumulated dust cleaning effect of each filter bag is improved, the service life of the filter bag is prolonged, and the dust collection quality of flue gas is improved. The utility model also provides a dust removal system.

Description

Low-pressure long-bag pulse dust collector and dust removal system

Technical Field

The utility model relates to the technical field of dust removal equipment, in particular to a low-pressure long-bag pulse dust collector and a dust removal system.

Background

A bag filter is a dry dust filter that is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of woven filter cloth or non-woven felt, the dust-containing gas is filtered by the filtering action of the fiber fabric, after the dust-containing gas enters the bag type dust collector, dust with large particles and large specific gravity falls into the dust hopper due to the sedimentation of the gravity, and the dust is blocked when the gas containing fine dust passes through the filter bag, so that the gas is purified.

The pulse blowing bag type dust collector is characterized in that when dust-containing gas enters the dust collector from an air inlet and firstly enters an ash bucket, coarse particle dust in the gas falls into the ash bucket due to the effects of inertia or natural sedimentation and the like, so that the effect of pre-collecting dust is achieved; the airflow entering the dust hopper is then folded to upwards pass through the filter bag, fine dust is trapped on the outer surface of the filter bag, and the purified gas enters a gas purifying chamber at the upper part of the filter bag chamber and is collected to an air outlet to be discharged; in the process of purifying the dust-containing gas by passing through the filter bag, more and more dust is accumulated on the filter bag along with the increase of time, the resistance of the filter bag is increased, so that the air volume for treatment is gradually reduced, and for normal work, the filter bag needs to be cleaned by controlling the resistance within a certain range (140 plus 170 mm water column); when the dust is cleaned, the clean air valve is closed, the electromagnetic pulse valves are sequentially triggered and opened by the automatic control system, compressed air is injected into the corresponding filter bags through the injection pipe, the filter bags are rapidly expanded and shaken instantly, so that dust deposited on the surfaces of the filter bags falls off, the filter bags are cleaned off-line, and the cleaned dust falls into the dust hopper and is discharged through the pneumatic conveying dust discharge system; therefore, the dust accumulated on the filter bag is periodically subjected to pulse injection ash removal, so that purified gas normally passes through, and the normal operation of a dust removal system is ensured; at present, the filter bag of the jetting of single injection pipe of this type of dust remover on the market is in large quantity for the terminal atmospheric pressure of injection pipe is lower, can not guarantee that injection pipe head and tail portion atmospheric pressure is unanimous, and is not thorough to the terminal filter bag clearance of injection pipe, influences flue gas dust removal quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a low-pressure long-bag pulse dust collector and a dust collection system, which are used for solving the problems in the prior art, reducing the air pressure difference at the head and tail ejection holes of an ejection tube, improving the accumulated dust cleaning effect of each filter bag, prolonging the service life of the filter bag and improving the dust collection quality of flue gas.

In order to achieve the purpose, the utility model provides the following scheme:

the utility model provides a low-pressure long-bag pulse dust collector, which comprises: the dust collector comprises a shell, a dust collecting cavity and a dust collecting cavity, wherein the shell is provided with an inner cavity, the inner cavity comprises a purified gas cavity, a filtering cavity and the dust collecting cavity which are sequentially arranged and communicated from top to bottom, the purified gas cavity is used for discharging purified gas through a purified gas port, and dust-containing gas is used for entering the dust collecting cavity through a gas inlet; the perforated plate is fixedly arranged in the inner cavity, the air purifying cavity is arranged above the perforated plate, and a plurality of rows or columns of through holes are formed in the perforated plate; the filter bags are arranged in the filter cavity and fixedly connected with the porous plate, and one filter bag is communicated with one through hole in the porous plate; the through holes in each row or each column on the porous plate are correspondingly provided with one blowing unit, and each blowing unit comprises two control parts and two blowing pipes; one end of each of the two injection pipes of each injection unit is closed to form a closed end, each closed end extends into the air purification cavity, the other end of each of the two injection pipes extends out of the air purification cavity and is respectively connected with one control part, and the part, located in the air purification cavity, of each of the two injection pipes of each injection unit extends along the row or column of the porous plate; the part of each blowing pipe, which is positioned in the air purification cavity, is provided with blowing holes opposite to the through holes formed in the porous plates, and the number of the blowing holes formed in the two blowing pipes of each blowing unit is the same as the number of the through holes formed in the porous plates of each corresponding row or each column; the control component is used for controlling compressed gas to enter the corresponding injection pipes, and the compressed gas is used for injecting the filter bags through the injection holes.

Preferably, the two blowing pipes of each blowing unit are arranged oppositely, and the two control parts are respectively positioned at two sides of the shell; the blowing pipes comprise a first blowing pipe and a second blowing pipe; the second blowing pipe is positioned in the air purifying cavity, the blowing hole is formed in the second blowing pipe, one end of the second blowing pipe is the closed end, one end of the second blowing pipe is fixedly connected and communicated with one end of the first blowing pipe, and the other end of the first blowing pipe extends out of the air purifying cavity and is communicated with the control component; the closed ends of the two second blowing pipes in each blowing unit are oppositely arranged and are fixedly connected with the porous plate through a support.

Preferably, the device also comprises two compressed air storage tanks, and the control part is provided with an electromagnetic pulse valve; the two compressed air storage tanks are respectively positioned at two sides of the shell, one ends of the blowing pipes in the blowing units, which extend out of the same side of the clean air cavity, extend into the compressed air storage tanks and are connected with the corresponding electromagnetic pulse valves, and the electromagnetic pulse valves are used for controlling the communication or the separation of the blowing pipes and the compressed air storage tanks.

Preferably, still including set up in the net gas passageway of shell one side, net gas chamber one side extends to net gas passageway top, net gas passageway upper wall be provided with be used for with the gas pocket of net gas chamber intercommunication, just be provided with on the net gas passageway lateral wall the gas purification mouth.

Preferably, the air hole control device is further included and comprises a driving part, a fixing frame, a connecting rod and a clean air valve; the driving part and the fixing frame are located above the air purifying cavity, the fixing frame is fixedly connected with the upper side wall of the air purifying cavity, the driving part is fixedly connected with the fixing frame, the output end of the driving part is fixedly connected with one end of the connecting rod, the other end of the connecting rod penetrates through the upper side wall of the air purifying cavity and extends into the air purifying cavity, one end of the connecting rod extends into the air purifying cavity is fixedly connected with the air purifying valve, and the driving part is used for driving the connecting rod to move in the vertical direction and drive the air purifying valve to move up and down to close or open the air hole.

Preferably, the dust collector further comprises a dust-containing gas channel arranged on one side of the shell, the side wall of the dust-containing gas channel is provided with the gas inlet, the dust-containing gas channel is communicated with the dust collecting cavity, and a valve is arranged in the dust-containing gas channel; the dust collecting cavity is a conical cavity, and the large opening end of the conical cavity is connected and communicated with the filter cavity; and a flow distribution plate is arranged at the communication part of the dust collection cavity and the dust-containing gas channel.

Preferably, the top of the shell is provided with a bag breaking detection device.

Preferably, each of perforated plate through-hole department all is fixed and is provided with venturi, each venturi's big footpath end with the relative intercommunication in blowing hole, each venturi's path end all stretches into in the filter bag.

The utility model also provides a dust removal system, which comprises two low-pressure long-bag pulse dust collectors; the two low-pressure long-bag pulse dust collectors are symmetrically arranged side by side.

Preferably, the clean air channels of the two low-pressure long-bag pulse dust collectors are communicated, and the dust air channels of the two low-pressure long-bag pulse dust collectors are communicated.

Compared with the prior art, the utility model has the following technical effects:

the utility model provides a low-pressure long-bag pulse dust collector.A dust-containing gas firstly enters a dust collecting cavity through a gas inlet, and coarse particle dust in the gas falls into the dust collecting cavity due to the effects of inertia or natural sedimentation and the like to play a role of pre-collecting dust; the airflow entering the dust collecting cavity is folded and upwards enters the filter cavity and passes through the filter bag, fine dust is trapped on the outer surface of the filter bag, and the purified gas sequentially passes through the filter bag and the porous plate to enter a gas purifying cavity at the upper part of the filter cavity and is collected to a gas purifying port to be discharged; after certain dust is accumulated on the peripheral surface of the filter bag, the plurality of injection units are controlled to work, two control parts of each injection unit control compressed air to enter the corresponding two injection pipes, and because one end of each injection pipe is a closed end, the compressed air sequentially passes through injection holes arranged on the injection pipes and through holes on the porous plate to inject the filter bag; in addition, each row or each column on the porous plate respectively corresponds to one injection unit, the injection holes on each injection unit and the through holes on each row or each column on the corresponding porous plate are oppositely arranged and have the same quantity, each through hole of the porous plate is respectively communicated with one filter bag, so the filter bags are also arranged in rows or columns, each row or each column of filter bags can be injected only by one injection unit, each injection unit comprises two injection pipes, and the two injection pipes are axially collinear in the clean air cavity and are arranged along the rows or the columns in an extending way, so the number of the injection holes arranged on a single injection pipe is less, correspondingly, the number of the filter bags injected by the single injection pipe is less, and during air injection, the air pressure difference between the head end and the tail end of the single injection pipe in the clean air cavity is smaller, so that the air pressure of the injection holes at each position of the single injection pipe is enough to meet the requirement of cleaning the filter bags, so can promote the clearance effect of filter bag, prolong the life of filter bag, improve flue gas dust removal quality.

The utility model also provides a dust removal system which has good cleaning effect on the filter bag, long service life of the filter bag and high dust removal quality of flue gas.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a low-pressure long bag pulse dust collector provided in accordance with an embodiment;

FIG. 2 is a left side view of the low pressure long bag pulse dust collector provided in FIG. 1;

FIG. 3 is an enlarged view of the structure at A in FIG. 1;

FIG. 4 is an enlarged view of the structure at B in FIG. 1;

fig. 5 is a schematic structural diagram of a dust removal system according to the second embodiment.

Icon: 1-low pressure long bag pulse dust collector; 11-a housing; 12-lumen; 121-a clean air cavity; 122-a filter chamber; 123-a dust collection chamber; 1231-a flow distribution plate; 13-a perforated plate; 131-a venturi tube; 14-a filter bag; 15-a blowing unit; 151-intake air control means; 1511-electromagnetic pulse valve; 152-a blowing pipe; 1521-a first blowing pipe; 1522-second blowing pipe; 153-blowing holes; 154-a support; 16-a gas purification channel; 161-air holes; 17-air hole control means; 171-a drive member; 1711-cylinder body; 1712-a piston rod; 172-a mount; 173-connecting rod; 174-net valve; 18-dusty gas channel; 181-a valve; 19-a bag breaking detection device; 20-compressed air storage tank.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

The present embodiment provides a low-pressure long bag pulse dust collector 1, please refer to fig. 1-4, which includes: the dust collector comprises a shell 11, wherein the shell 11 is provided with an inner cavity 12, the inner cavity 12 comprises a gas purifying cavity 121, a filter cavity 122 and a dust collecting cavity 123 which are sequentially arranged and communicated from top to bottom, the gas purifying cavity 121 is used for discharging purified gas through a gas purifying port, and dust-containing gas is used for entering the dust collecting cavity 123 through a gas inlet; the porous plate 13 is fixedly arranged in the inner cavity 12, a gas purifying cavity 121 is arranged above the porous plate 13, and a plurality of rows or columns of through holes are formed in the porous plate 13; the filter bags 14 are arranged in the filter cavity 122 and fixedly connected with the porous plate 13, and one filter bag 14 is communicated with one through hole in the porous plate 13; the plurality of blowing units 15 are arranged, one blowing unit 15 is correspondingly arranged in each row or each column of through holes on the porous plate 13, and each blowing unit 15 comprises two control parts 151 and two blowing pipes 152; one end of each of the two injection pipes 152 of each injection unit 15 is closed to form a closed end, each closed end extends into the air purification cavity 121, the other end of each of the two injection pipes 152 extends out of the air purification cavity 121 and is respectively connected with one control part 151, and the parts of the two injection pipes 152 of each injection unit 15, which are positioned in the air purification cavity 121, are axially collinear and extend along the rows or columns of the porous plates 13; the part of each blowing pipe 152 located in the air purifying chamber 121 is provided with blowing holes 153 opposite to the through holes formed in the porous plates 13, and the number of the blowing holes 153 formed in the two blowing pipes 152 of each blowing unit 152 is the same as the number of the through holes formed in the corresponding porous plates 13 in each row or each column; the control part 151 is used to control the introduction of the compressed gas into the corresponding injection tube 152, and the compressed gas is used to inject the filter bag 14 through each injection hole 153.

The dust-containing gas firstly enters the dust collecting cavity 123 through the gas inlet, and coarse particle dust in the gas falls into the dust collecting cavity 123 due to the effects of inertia or natural sedimentation and the like, so that the effect of pre-collecting dust is achieved; the air flow entering the dust collecting cavity 123 is folded and upwards enters the filter cavity 122 and passes through the filter bag 14, fine dust is trapped on the outer surface of the filter bag 14, and the purified air sequentially passes through the filter bag 14 and the porous plate 13 to enter the air purifying cavity 121 at the upper part of the filter cavity 122 and is collected to the air purifying port to be discharged; after certain dust is accumulated on the outer peripheral surface of the filter bag 14, the plurality of blowing units 15 are controlled to work, the two control parts 151 of each blowing unit 15 control compressed air to enter the corresponding two blowing pipes 152, and because one end of each blowing pipe 152 is a closed end, the compressed air sequentially passes through the blowing holes 153 arranged on the blowing pipe 152 and the through holes on the porous plate 13 to blow the filter bag 14; in addition, each row or each column on the porous plate 13 corresponds to one blowing unit 15, the blowing holes 153 on each blowing unit 15 are arranged opposite to each row or each column of through holes on the corresponding porous plate 13 and have the same quantity, each through hole of the porous plate 13 is communicated with one filter bag 14, so that the filter bags 14 are also arranged in rows or columns, and each row or each column of filter bags 14 can be blown by only one blowing unit 15, and each blowing unit 15 comprises two blowing pipes 152, and the two blowing pipes 152 are axially collinear in the air purification cavity 121 and are arranged along the rows or the columns in an extending manner, so that the number of the blowing holes 153 arranged on a single blowing pipe 152 is small, correspondingly, the number of the filter bags 14 blown by the single blowing pipe 152 is small, and thus, during air injection, the air pressure difference between the head end and the tail end of the single blowing pipe 152 is small, so that the air pressure of the blowing holes 153 at each position of the single blowing pipe 152 is large enough to meet the requirement of cleaning the filter bags 14, so can promote the clearance effect of filter bag 14, prolong the life of filter bag 14, improve flue gas dust removal quality.

Specifically, the number of the blowing holes 153 provided in a single blowing tube 152 in this embodiment is 7 or 8, and compared with the conventional blowing tube 152 provided with 15 blowing holes 153, the blowing effect of this embodiment is better; in addition, the filter bag 14 is internally provided with a metal cage bar which plays a role of supporting the filter bag 14.

In an alternative of this embodiment, preferably, referring to fig. 3, two blowing tubes 152 of each blowing unit 15 are disposed oppositely, and two control components 151 are respectively located at two sides of the housing 11; the injection tube 152 includes a first injection tube 1521 and a second injection tube 1522; the second injection tube 1522 is positioned in the clean air cavity 121, an injection hole 153 is formed in the second injection tube 1522, one end of the second injection tube 1522 is fixedly connected and communicated with one end of the first injection tube 1521, specifically, the first injection tube 1521 and the second injection tube 1522 can be connected through threads, so that the installation and the disassembly are convenient, and the other end of the first injection tube 1521 extends out of the clean air cavity 121 and is communicated with the air inlet control component 151; the closed ends of two opposite second injection tubes 1522 in each injection unit 15 are fixedly connected with the porous plate 13 through one support 154, that is, the number of the supports 154 is the same as that of the injection units 15, specifically, two ends of the supports 154 can be welded with the porous plate 13 and the second injection tubes 1522, so that the stability of the device is improved.

In the alternative of this embodiment, preferably, referring to fig. 3, two compressed air storage tanks 20 are further included, and the control part 151 is provided as an electromagnetic pulse valve 1511; the two compressed air storage tanks 20 are respectively located at two sides of the housing 11, one ends of the injection pipes 152 of the multiple injection units 15, which extend out of the same side of the clean air cavity 121, extend into one compressed air storage tank 20 and are connected with corresponding electromagnetic pulse valves 1511, and the electromagnetic pulse valves 1511 are used for controlling the communication or the blockage between the injection pipes 152 and the compressed air storage tanks 20.

Further, this embodiment may be provided with an automatic control system, such as a PLC, for controlling the operation of each electromagnetic pulse valve 1511 to control the connection or disconnection between the blowing pipe 152 and the compressed air storage tank 20.

In an alternative of this embodiment, it is preferable that the low-pressure long bag pulse dust collector 1 provided in this embodiment further includes a clean air channel 16 disposed on one side of the housing 11, one side of the clean air cavity 121 extends to above the clean air channel 16, an air hole 161 for communicating with the clean air cavity 121 is disposed on an upper wall surface of the clean air channel 16, and a clean air hole is disposed on a side wall of the clean air channel 16; the clean air in the clean air chamber 121 passes through the air hole 161 in the clean air channel 16 today and enters the following devices through the clean air hole.

In an alternative of this embodiment, referring to fig. 4, preferably, the low-pressure long bag pulse dust collector 1 provided in this embodiment further includes an air hole control device 17, where the air hole control device 17 includes a driving part 171, a fixing frame 172, a connecting rod 173, and a clean air door 174; the driving part 171 and the fixing frame 172 are positioned above the air purifying chamber 121, the fixing frame 172 is fixedly connected with the upper side wall of the air purifying chamber 121, the driving part 171 is fixedly connected with the fixing frame 172, the output end of the driving part 171 is fixedly connected with one end of the connecting rod 173, the other end of the connecting rod 173 penetrates through the upper side wall of the air purifying chamber 121 and extends into the air purifying chamber 121, one end of the connecting rod 173 extending into the air purifying chamber 121 is fixedly connected with the air purifying valve 174, and the driving part 171 is used for driving the connecting rod 173 to move along the vertical direction and driving the air purifying valve 174 to move up and down to close or open the air hole 161; specifically, the driving unit 171 may be configured as an air cylinder, the cylinder 1711 is fixedly connected to the fixing frame 172, and the output end of the piston rod 1712 is fixedly connected to one end of the connecting rod 173; by the arrangement, the piston rod 1712 is separated from the clean air cavity 121, so that the piston rod 1712 is separated from a high-temperature smoke environment, the working condition of the piston rod 1712 is improved, the service life of the air cylinder is prolonged, and the sealing performance of the air cylinder and the clean air door 174 is protected from being influenced; specifically, the connecting rod 173 is made of a stainless steel material with high temperature resistance and wear resistance.

In an alternative of this embodiment, please refer to fig. 1 more preferably, the low-pressure long bag pulse dust collector 1 provided in this embodiment further includes a dust-containing gas channel 18 disposed at one side of the housing 11, a gas inlet is disposed on a side wall of the dust-containing gas channel 18, the dust-containing gas channel 18 is communicated with the dust collecting cavity 123, and a valve 181 is disposed in the dust-containing gas channel 18; the dust collecting cavity 123 is a conical cavity, the large opening end of the conical cavity is communicated with the filter cavity 122, and the small opening end of the conical cavity is positioned below; a flow distribution plate 1231 is arranged at the communication position between the dust collection cavity 123 and the dust-containing gas channel 18, specifically, the flow distribution plate 1231 is obliquely arranged in the dust collection cavity 123, the upper end of the flow distribution plate 1231 is fixedly connected with the upper end of the communication position between the dust collection cavity 123 and the dust-containing gas channel 18, and a certain gap is formed between the flow distribution plate 1231 and the side wall of the dust collection cavity 123; so set up, in dusty gas gets into dusty gas channel 18 by the air inlet to get into dust collection chamber 123 through valve 181, dusty gas is at first run into flow distribution plate 1231, and the air current just turns to the microcephaly end that flows in dust collection chamber 1231 and is the bottom, and air velocity slows down simultaneously, because inertial action, makes the bottom in the gas coarse particle dust direct inflow dust collection chamber, plays the effect of collecting dirt in advance.

In the alternative of this embodiment, please refer to fig. 4, preferably, a bag-breaking detection device 19 is disposed on the top of the housing 11; the abnormal fluctuation of the pressure difference in the inner cavity 12 of the device is used for detecting the breakage condition of the filter bag 14.

In an alternative of this embodiment, referring to fig. 3, preferably, each through hole of the porous plate 13 is fixedly provided with a venturi tube 131, a large diameter end of each venturi tube 131 is relatively communicated with the blowing hole 153, a small diameter end of each venturi tube 131 extends into the filter bag 14, and compressed gas blown from the blowing hole 153 can increase a partial flow velocity after passing through the venturi tube 131, so that the compressed gas can fully blow and remove dust from the filter bag 14.

Example two

The present embodiment provides a dust removal system, please refer to fig. 5, which includes two low-pressure long bag pulse dust collectors 1 according to the first embodiment, and the two low-pressure long bag pulse dust collectors 1 are symmetrically arranged side by side, specifically, the clean air channels 16 of the two low-pressure long bag pulse dust collectors are communicated, and the dust air channels 18 of the two low-pressure long bag pulse dust collectors 1 are communicated; namely, two low-pressure long-bag pulse dust collectors 1 share one clean air channel 16 and one dust-containing air channel 18, so as to improve the dust removal efficiency of dust-containing air.

The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.

Claims

1. The utility model provides a long bag pulse dust collector of low pressure which characterized in that: the method comprises the following steps:

the dust collector comprises a shell (11), wherein the shell (11) is provided with an inner cavity (12), the inner cavity (12) comprises a purified air cavity (121), a filtering cavity (122) and a dust collecting cavity (123), the purified air cavity (121) is sequentially arranged from top to bottom and communicated with the filtering cavity (122), purified air is discharged from a purified air port, and dust-containing air enters the dust collecting cavity (123) through an air inlet;

the perforated plate (13) is fixedly arranged in the inner cavity (12), the air purifying cavity (121) is arranged above the perforated plate (13), and a plurality of rows or columns of through holes are formed in the perforated plate (13);

the filter bags (14) are arranged in the filter cavity (122) and fixedly connected with the porous plate (13), and one filter bag (14) is communicated with one through hole in the porous plate (13); and

the through holes of each row or each column on the porous plate (13) are correspondingly provided with one blowing unit (15), and each blowing unit (15) comprises two control parts (151) and two blowing pipes (152); one end of each of the two injection pipes (152) of each injection unit (15) is closed to form a closed end, each closed end extends into the clean air cavity (121), the other end of each of the two injection pipes (152) extends out of the clean air cavity (121) and is respectively connected with one control component (151), and the parts, located in the clean air cavity (121), of the two injection pipes (152) of each injection unit (15) are axially collinear and extend along the rows or columns of the porous plates (13); the part of each blowing pipe (152) positioned in the purified air cavity (121) is provided with blowing holes (153) opposite to the through holes formed in the porous plates (13), and the number of the blowing holes (153) formed in the two blowing pipes (152) of each blowing unit (15) is the same as the number of the through holes formed in the corresponding porous plates (13) in each row or each column; the control part (151) is used for controlling the compressed gas entering into the corresponding injection tube (152), and the compressed gas is used for injecting the filter bag (14) through each injection hole (153).

2. A low pressure long bag pulse precipitator as claimed in claim 1, in which: the two blowing pipes (152) of each blowing unit (15) are arranged oppositely, and the two control parts (151) are respectively positioned on two sides of the shell (11);

the injection tube (152) comprises a first injection tube (1521) and a second injection tube (1522); the second injection tube (1522) is positioned in the clean air cavity (121), the second injection tube (1522) is provided with the injection hole (153), one end of the second injection tube (1522) is the closed end, the other end of the second injection tube (1522) is fixedly connected and communicated with one end of the first injection tube (1521), and the other end of the first injection tube (1521) extends out of the clean air cavity (121) and is communicated with the control component (151); the closed ends of the two second blowing pipes (1522) in each blowing unit (15) are arranged oppositely and fixedly connected with the porous plate (13) through a support (154).

3. A low pressure long bag pulse precipitator as claimed in claim 2, in which: the device also comprises two compressed air storage tanks (20), and the control component (151) is provided with an electromagnetic pulse valve (1511);

the two compressed air storage tanks (20) are respectively positioned at two sides of the shell (11), one ends of the blowing pipes (152) in the blowing units (15) extending out of the same side of the purified air cavity (121) extend into one compressed air storage tank (20) and are connected with the corresponding electromagnetic pulse valves (1511), and the electromagnetic pulse valves (1511) are used for controlling the communication or the obstruction of the blowing pipes (152) and the compressed air storage tanks (20).

4. A low pressure long bag pulse precipitator as claimed in claim 1, in which: the air purifying device is characterized by further comprising an air purifying channel (16) arranged on one side of the shell (11), wherein one side of the air purifying cavity (121) extends to the position above the air purifying channel (16), an air hole (161) used for being communicated with the air purifying cavity (121) is formed in the upper wall surface of the air purifying channel (16), and the air purifying hole is formed in the side wall of the air purifying channel (16).

5. The low pressure long bag pulse precipitator of claim 4, wherein: the air hole control device (17) is further included, and the air hole control device (17) comprises a driving part (171), a fixing frame (172), a connecting rod (173) and a clean air valve (174);

the driving component (171) and the fixing frame (172) are located above the air purifying cavity (121), the fixing frame (172) is fixedly connected with the upper side wall of the air purifying cavity (121), the driving component (171) is fixedly connected with the fixing frame (172), the output end of the driving component (171) is fixedly connected with one end of a connecting rod (173), the other end of the connecting rod (173) penetrates through the upper side wall of the air purifying cavity (121) and extends into the air purifying cavity (121), one end of the connecting rod (173) extending into the air purifying cavity (121) is fixedly connected with the air purifying valve (174), and the driving component (171) is used for driving the connecting rod (173) to move along the vertical direction and driving the air purifying valve (174) to move up and down to close or open the air hole (161).

6. A low pressure long bag pulse precipitator as claimed in claim 1, in which: the dust-containing air purifier further comprises a dust-containing air channel (18) arranged on one side of the shell (11), the side wall of the dust-containing air channel (18) is provided with the air inlet, the dust-containing air channel (18) is communicated with the dust collecting cavity (123), and a valve (181) is arranged in the dust-containing air channel (18);

the dust collecting cavity (123) is arranged to be a conical cavity, and the large opening end of the conical cavity is connected and communicated with the filter cavity (122); and a flow distribution plate (1231) is arranged at the communication part of the dust collection cavity (123) and the dust-containing gas channel (18).

7. A low pressure long bag pulse precipitator as claimed in claim 1, in which: the top of the shell (11) is provided with a bag breaking detection device (19).

8. A low pressure long bag pulse precipitator as claimed in claim 1, in which: the through holes of the porous plate (13) are fixedly provided with Venturi tubes (131), the large-diameter ends of the Venturi tubes (131) are communicated with the blowing holes (153) relatively, and the small-diameter ends of the Venturi tubes (131) extend into the filter bag (14).

9. A dust pelletizing system which characterized in that: comprising two low-pressure long bag pulse precipitators (1) according to any of claims 1-8; the two low-pressure long-bag pulse dust collectors (1) are symmetrically arranged side by side.

10. The dusting system of claim 9, wherein: the clean gas channels (16) of the two low-pressure long-bag pulse dust collectors are communicated, and the dust-containing gas channels (18) of the two low-pressure long-bag pulse dust collectors (1) are communicated.