CN114522803B - Reverse multistage vortex dust removal system - Google Patents
Reverse multistage vortex dust removal system Download PDFInfo
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- CN114522803B CN114522803B CN202210432562.8A CN202210432562A CN114522803B CN 114522803 B CN114522803 B CN 114522803B CN 202210432562 A CN202210432562 A CN 202210432562A CN 114522803 B CN114522803 B CN 114522803B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The application discloses a reverse multistage vortex dust removal system, which comprises a dust remover body, wherein two rows of dust collecting polar plates which are parallel to each other are arranged in an outlet horn of the dust remover body, the dust collecting polar plates are formed by arranging concave groove plates, concave surfaces of the two rows of dust collecting polar plates are opposite, the concave groove plates in the two rows of dust collecting polar plates are arranged in a staggered manner, and the concave groove plates are provided with semicircular turned edges with inward openings; except the turned edge at the outermost side of the dust collecting polar plate, all other semicircular turned edges extend into the concave groove plate of the other row of dust collecting polar plates opposite to the turned edge, and are opposite to the semicircular turned edges of the extended concave groove plate to form a vortex region with an inlet and an outlet, and smoke can leave the dust collecting polar plate only after passing through the vortex region. This application can realize the collection to different particle diameter granules through the vortex region, avoids the dust to escape the problem that the dust collecting area leads to exceeding standard for the flue gas is purified more step by step.
Description
Technical Field
The application relates to the technical field of environmental protection and dust removal, in particular to a reverse multistage vortex dust removal system.
Background
The existing dry dust collector (such as electrostatic dust collection, cloth bag dust collection, electric bag dust collection, cyclone dust collection and the like) has the phenomenon that the outlet exceeds the discharge standard. For example, the discharge of the electrostatic dust collector exceeds the standard due to secondary dust emission generated by rapping; bag dust removal and electric bag dust removal cause the discharge to exceed the standard due to bag breaking; the cyclone dust removal causes the exceeding of standard due to the unstable flue gas flow velocity caused by the change of the flue gas load.
Wet dust collectors (e.g., wet electrostatic dust collection, water film dust collection, spray dust collection, cyclone coupled dust collection, etc.) also have a phenomenon that the outlet exceeds the discharge standard. For example, wet scrubber emissions are generally overproof, mainly in terms of excessive outlet droplet concentration.
To the problem that the export exceeds the discharge standard, the Chinese patent application No: 201120192011.6, name: the utility model provides an electrostatic precipitator export flute profile plate structure of improvement dust collection efficiency, discloses and evenly set up in electrostatic precipitator electric field outlet by 'concave' font flute profile plate, flute profile plate staggered arrangement opening direction is relative. However, when the flue gas passes through the trough-shaped plate, the trough-shaped plate only has the function of blocking the flue gas to change the flow direction of the flue gas, and the effect of changing the flow field by blocking is very little for improving the dust removal efficiency. In the internal form vortex area of the open concave groove-shaped plate, only about 10% of the smoke on the windward side of the concave opening enters the internal form vortex area, and most of the smoke directly enters the downstream, so that the dust removal efficiency is not greatly improved.
Disclosure of Invention
The problem that the outlets of the existing dry dust collector and the wet dust collector exceed the discharge standard is solved. The application provides a reverse multistage vortex dust removal system and process, and the application can be arranged at a loudspeaker or a flue at the outlet of a dry dust collector or a wet dust collector to thoroughly collect' fish leaking from the outlet of the dust collector.
The application provides a reverse multistage vortex dust pelletizing system, dust pelletizing system's casing 1 is equipped with import loudspeaker 11 and export loudspeaker 12 relatively on the horizontal direction, lays dust collecting device in casing 1, establishes the dust collecting polar plate 2 in the export loudspeaker 12 section, dust collecting polar plate 2 includes two rows of mutual parallel arrangement's the first dust collecting polar plate 21 that is in the gas flow upper reaches and is in the second dust collecting polar plate 22 of gas flow low reaches, first dust collecting polar plate 21 and second dust collecting polar plate 22 are fixed a position concave groove board 24 on first angle steel 23 by at least two respectively and are constituteed, have the clearance that the gas passes through between adjacent concave groove board 24, concave groove board 24's both sides 241 encloses into recess 242, the side 241 tip is semi-circular turn-up 243, and the semi-circular turn-up 243 of both sides 241 curls to recess 242, and the recess 242 of concave groove board 24 of first dust collecting polar plate 21 and second dust collecting polar plate 22 is relative and crisscross to be laid, and the side edges 241 of the adjacent concave groove plates 24 of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 mutually extend into the opposite groove 242, and the two semicircular curled edges 243 are mutually matched to form a vortex area 25 in which gas can enter and exit.
Further, the concave groove plate 24 is formed by rolling a sheet with a thickness of 1.0 mm to 1.5mm by a sheet rolling mill.
Further, the concave groove plate 24 is fixed on the first angle steel 23 by a backing plate 26, wherein the backing plate 26 is located at the bottom of the groove 242, and the first connecting member 27 penetrates through the backing plate 26 and the concave groove plate 24 and fixes the two to the first angle steel 23.
Further, the backing plates 26 of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 are fixedly connected through a positioning sleeve 28, so that the first dust collecting polar plate 21 and the second dust collecting polar plate 22 are connected into a whole.
Further, the width of the concave groove plate 24 is K, K is 100 mm-300 mm, the height of the concave groove plate 24 is G, G is 40 mm-120 mm, G: k =0.4 ~ 1: 1.
further, a gap 29 between the concave groove plates 24 of the first dust collecting electrode plate 21 is used as an air inlet, a gap 29 between the concave groove plates 24 of the second dust collecting electrode plate 22 is used as an air outlet, the width of the gap 29 is D, and D is 50 mm-150 mm; the gap between the adjacent concave groove plates 24 of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 is S, and the S is 5-15 mm; the total thickness of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 is H, and H is 55 mm-170 mm; the radius of the semicircular bead 243 of the concave groove plate 24 is R, and R is 10 mm to 35 mm.
Further, the upper portion of the dust collecting polar plate 2 is connected with the wall surface of the outlet horn 12 through a first connecting device 3, the lower portion of the dust collecting polar plate 2 is connected with the wall surface of the outlet horn 12 through a second connecting device 4, and a spoiler 8 is arranged on the edge of the dust collecting polar plate 2.
Further, the first connecting device 3 comprises a positioning frame 31, a positioning installation angle steel 32 and a first connecting angle steel 33, the concave groove plate 24 of the dust collecting pole plate 2 is connected with the first connecting angle steel 33, the first connecting angle steel 33 is connected with the positioning installation angle steel 32, the positioning installation angle steel 32 is connected with the positioning frame 31, and the positioning frame 31 is fixed on the wall surface of the outlet horn 12 through a second connecting piece 34; the second connecting device 4 comprises a second connecting angle 41 and a support frame 42, the concave groove plate of the dust collecting pole plate 2 is fixed on the support frame 42 through the second connecting angle 41, and the support frame 42 is fixed on the wall surface of the outlet horn 12.
Further, dust pelletizing system is dry-type dust pelletizing system, the next-door neighbour dust collecting polar plate 2 still be equipped with rapping device 5, rapping device 5 shakes including rapping transmission, shake and beats the axle, shake and beat the hammer, shakes through control rapping device 5 and shakes dust collecting polar plate 2 to realize online deashing, deashing cycle and frequency pass through control logic and set up, 2 materials of dust collecting polar plate use Q235 steel.
Further, the dust removal system is a wet dust removal system, a nozzle 6 is further arranged on the upper portion close to the dust collection pole plate 2, the nozzle 6 is connected with a water circulation device 7, the water circulation device 7 is connected with a process water tank 71 arranged outside the shell 1 through a pipeline, a process water pump 72 and a switch valve 73, the process water tank 71 and the process water pump 72 are shared with wet dust removal spraying, the dust collection pole plate 2 can be sprayed and washed by controlling the operation of the water circulation device 7, online dust removal is realized, the dust removal period and frequency are set through control logic, and the dust collection pole plate 2 can be made of 316L, 2205 or 2507 stainless steel.
The technical scheme has the following advantages or beneficial effects: (1) the flue gas can leave the dust removal polar plate only after passing through the vortex region, the dust removal of particles with various particle sizes in the flue gas can be enhanced, the dust removal effect is enhanced, and the flue gas meets the emission standard. Therefore, the problem that dust escapes from a dust collection area to cause standard exceeding in the prior dust removal technology is overcome, and the smoke is purified further.
(2) Because this application has mated with the technique of rapping deashing or spraying deashing, consequently overcome the problem that can only be used for dry-type dust removal afterbody among the prior art, dry dust remover and wet-type dust removal afterbody all can use.
(3) The dust collecting polar plate adopts the thickness of 1.0-1.5 mm, and can realize rolling of a rolling mill, so that the problem that C-shaped steel can only be used in the prior art is solved, and the steel consumption is greatly reduced. The material may use Q235 for the dry precipitator tail and 316L, 2205 or 2507 stainless steel for the wet precipitator tail.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious to a person skilled in the art that other figures can also be obtained from the provided figures without inventive effort.
FIG. 1 is a schematic plan view of an inverted multi-stage vortex dust removal system according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a dust collecting pole plate of an inverted multistage vortex dust removal system according to an embodiment of the present application.
FIG. 3 is a schematic diagram of a concave trough plate of an inverted multi-stage vortex dust removal system according to an embodiment of the present application.
Fig. 4 is a schematic sectional structure and an airflow direction of a dust collecting pole plate of an inverted multistage vortex dust removal system according to an embodiment of the present application.
FIG. 5 is a schematic structural diagram of a dust collecting plate of an inverted multi-stage vortex dust removal system according to another embodiment of the present application.
Fig. 6 is a schematic structural diagram of a connection relationship between a dust collecting electrode plate and an outlet horn of an inverted multistage vortex dust removal system according to an embodiment of the present application.
FIG. 7 is a schematic view of the spoiler structure of the inverted multi-stage vortex dust removal system according to an embodiment of the present application.
FIG. 8 is a reverse multi-stage vortex dry dedusting system according to one embodiment of the present application.
FIG. 9 illustrates an inverted multi-stage vortex wet dust removal system according to an embodiment of the present application.
Fig. 10 is a parameter table of embodiment 1 of the present application.
Fig. 11 is a parameter table of embodiment 2 of the present application.
In the figure, a housing 1; an inlet horn 11; an outlet horn 12; an ash hopper 13; a dust collecting polar plate 2; a first dust collecting electrode plate 21; a first dust collecting electrode plate 22; a first angle 23; a concave groove plate 24; a side edge 241; a groove 242; a semicircular bead 243; a vortex region 25; a backing plate 26; a first connecting member 27; a positioning sleeve 28; the gap 29; a first connecting means 3; a positioning frame 31; positioning and mounting angle steel 32; a first connecting angle 33; a second connecting member 34; a second connecting means 4; a second connecting angle 41; a support frame 42; a rapping device 5; a nozzle 6; a water circulation device 7; a spoiler 8.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings of the present application. It is obvious that the described embodiments are only a few embodiments of the present application, which are intended to explain the inventive concept. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. used in the description are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "plurality" means two or more unless specifically limited otherwise.
Unless expressly stated or limited otherwise, the terms "connected," "connected," and the like as used in the description are to be construed broadly, and for example, as meaning a fixed connection, a removable connection, or an integral part; can be mechanical connection and electrical connection; may be directly connected, or indirectly connected through an intermediate; either as communication within the two elements or as an interactive relationship of the two elements. Specific meanings of the above terms in the examples can be understood by those of ordinary skill in the art according to specific situations.
Reference throughout this specification to "one particular embodiment" or "an example" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, which is a schematic cross-sectional view of a reverse multi-stage vortex dust removal system according to an embodiment of the present disclosure, a housing 1 of the dust removal system is provided with an inlet horn 11 and an outlet horn 12 in a horizontal direction, an ash bucket is provided at a lower portion of the housing 1, a dust collection device is disposed in the housing 1, and a dust collection electrode plate 2 is disposed in the outlet horn 12. The flue gas is introduced into the shell 1 through the inlet horn 11, the flue gas is dedusted through the dust collecting device, the dedusted gas is further treated by the dust collecting polar plate 2 to be purified again, the purified gas enters the inlet downstream through the outlet horn 12 or is directly discharged into the atmosphere, and wastes generated by the operation of the dedusting system are collected in the ash hopper at the lower part of the shell 1 to be output.
Fig. 2 is a schematic structural diagram of a dust collecting electrode plate 2 of an inverted multistage vortex dust removing system according to an embodiment of the present application, where the dust collecting electrode plate 2 includes two rows of first dust collecting electrode plates 21 arranged in parallel and located upstream of a gas flow and second dust collecting electrode plates 22 arranged downstream of the gas flow. The first dust collecting polar plate 21 and the second dust collecting polar plate 22 are respectively composed of at least two concave groove plates 24 positioned on a first angle steel 23, and a gap for air to pass through is formed between the adjacent concave groove plates 24.
Referring to fig. 3, which is a schematic structural diagram of a concave trough plate 24 of an inverted multistage vortex dust removal system according to an embodiment of the present invention, two sides 241 of the concave trough plate 24 enclose a groove 242, ends of the sides 241 are curled in a semicircular shape 243, and the semicircular curls 243 of the two sides 241 are curled toward the groove 242.
The grooves 242 of the parallel concave groove plates 24 are arranged oppositely, the concave groove plates 24 of the first dust collecting electrode plate 21 and the second dust collecting electrode plate 22 are arranged in a staggered mode, the side edges 241 of the adjacent concave groove plates 24 of the first dust collecting electrode plate 21 and the second dust collecting electrode plate 22 extend into the grooves 242 of the opposite side, and the semicircular curled edges 243 are matched with each other to form a vortex area 25 in which gas can enter and exit.
Preferably, the concave groove plate 24 is fixed on the first angle 23 by a backing plate 26, wherein the backing plate 26 is located at the bottom of the groove 242, and the first connecting member 27 penetrates through the backing plate 26 and the concave groove plate 24 and fixes the two to the first angle 23. Preferably, the backing plates 26 of the first dust collecting electrode plate 21 and the second dust collecting electrode plate 22 are fixedly connected through a positioning sleeve 28, so that the first dust collecting electrode plate 21 and the second dust collecting electrode plate 22 are connected into a whole. Preferably, the concave groove plate 24 is formed by rolling a thin plate with the thickness of 1.0 mm to 1.5mm through a sheet rolling mill, and the steel consumption is reduced compared with C-shaped steel in the prior art.
Fig. 4 is a schematic cross-sectional structure and an airflow direction of a dust collecting electrode plate 2 of an inverted multistage vortex dust removal system according to an embodiment of the present application. The air flows through the gap 29 between adjacent concave fluted plates 24 of the first dust collecting plate 21, enters the grooves 242 of the concave fluted plates 24 of the second dust collecting plate 22 and then enters the eddy current region 25 formed by the mutual matching of the semicircular curled edges 243. Fine particles in the gas are collected on the dust collecting polar plate 2 due to collision and static electricity, larger particles in the gas are collected at the center of the vortex in the vortex area 25 and fall and are collected by the self weight, and ultrafine particles in the gas are collected on the inner side of the arc surface of the semicircular curled edge 243 due to the centrifugal force in the vortex. After the system is processed, the requirement of ultra-low emission standard can be approached or met, and downstream or direct exhaust atmosphere can be introduced.
Fig. 2 and fig. 4 are shown as examples only, and the length of the dust collecting electrode plate 2 can be adjusted accordingly according to the size of the dust removing system, so that the dust collecting electrode plate 2 is fully distributed on the whole cross section, and the deep purification treatment of all the flue gas is realized on the cross section.
As shown in fig. 5, which is a schematic structural diagram of the dust collecting electrode plate 2 of the reverse multi-stage vortex dust removing system according to an embodiment of the present application, the width of the concave groove plate 24 is K, and K is 100 mm to 300 mm. The height of the concave groove plate 24 is G, G is 40 mm-120 mm, G: k =0.4 ~ 1: 1. the width D of the gap 29 between the concave groove plates 24 of the first dust collecting electrode plate 21 as an air inlet and the width D of the gap 29 between the concave groove plates 24 of the second dust collecting electrode plate 22 as an air outlet is 50 mm-150 mm. The gap between the adjacent concave groove plates 24 of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 is S, and S is 5 mm-15 mm. The total thickness of the first dust collecting polar plate 21 and the second dust collecting polar plate 22 is H, and H is 55 mm-170 mm. The radius of the semicircular bead 243 of the concave groove plate 24 is R, and R is 10 mm to 35 mm.
Fig. 6 is a schematic structural diagram of a connection relationship between a dust collecting electrode plate 2 and an outlet horn 12 of an inverted multistage vortex dust removal system according to an embodiment of the present application. The upper part of the dust collecting polar plate 2 is connected with the wall surface of the outlet horn 12 through a first connecting device 3. The first connecting device 3 comprises a positioning frame 31, a positioning installation angle steel 32 and a first connecting angle steel 33, the concave groove plate 24 of the dust collecting pole plate 2 is connected with the first connecting angle steel 33, the first connecting angle steel 33 is connected with the positioning installation angle steel 32, the positioning installation angle steel 32 is connected with the positioning frame 31, and the positioning frame 31 is fixed on the wall surface of the outlet horn 12 through a second connecting piece 34. The lower portion of the dust collecting pole plate 2 is connected with the wall surface of the outlet loudspeaker 12 through a second connecting device 4, the second connecting device 4 comprises a second connecting angle steel 41 and a supporting frame 42, the concave groove plate of the dust collecting pole plate 2 is fixed on the supporting frame 42 through the second connecting angle steel 41, and the supporting frame 42 is fixed on the wall surface of the outlet loudspeaker 12.
Fig. 7 is a schematic structural view of a spoiler 8 of the reverse multi-stage vortex dry dust collecting system according to an embodiment of the present invention. And a spoiler 8 is arranged at the edge of the dust collecting polar plate 2 to seal a gap between the inner wall of the outlet horn 12 and the dust collecting polar plate 2. The flue gas is introduced into the shell 1 through the inlet horn 11, and after the flue gas is dedusted by the dust collecting device, the flue gas is limited to pass through only a gap 29 between adjacent concave groove plates 24 of the first dust collecting polar plate 21 due to the arrangement of the spoiler 8, and is treated by the dust collecting polar plate 2 for secondary purification.
As shown in FIG. 8, in the reverse multi-stage vortex dry dust removal system according to one embodiment of the present application, on-line ash removal is achieved by rapping. Dust pelletizing system's casing 1 is equipped with import loudspeaker 11 and export loudspeaker 12 relatively in the horizontal direction, and casing 12 lower part is equipped with ash bucket 13, lays dust collecting device in casing 1, establishes foretell dust collecting polar plate 2 in export loudspeaker 12 section, the next-door neighbour dust collecting polar plate 2 still be equipped with rapping device 5, rapping device 5 is including rapping transmission, shake and beat the axle, shake and beat the hammer. The dust collecting polar plate 2 can be rapped by controlling the rapping device 5 so as to realize online ash removal, and the ash removal period and frequency can be set through control logic. The flue gas is introduced into the shell 1 through the inlet horn 11, the flue gas is dedusted by the dust collecting device, the dedusted gas is further treated by the dust collecting polar plate 2 to meet the requirement of ultra-low emission, and the purified gas is introduced into the downstream through the outlet horn 12 to be continuously treated to meet the requirement of ultra-low emission. When the dust is accumulated to a certain thickness, the dust collecting efficiency is reduced, so that the attached dust needs to be cleaned by periodical vibration, and the blocky dust falling off by vibration falls into the dust hopper 13 and is sent out by the dust conveying system. The dust collecting polar plate 2 can be made of Q235 steel.
As shown in fig. 9, the reverse multi-stage vortex wet dust removal system according to an embodiment of the present application realizes online ash removal by spray rinsing. The shell 1 of the dust removal system is relatively provided with an inlet horn 11 and an outlet horn 12 in the horizontal direction, the lower part of the shell 12 is provided with an ash hopper 13, a dust collecting device is arranged in the shell 1, the dust collecting polar plate 2 is arranged in the outlet horn 12 section, a nozzle 6 is arranged at the upper part of the dust collecting polar plate 2 in close proximity, and the nozzle 6 is connected with a water circulating device 7. The water circulation device 7 is connected with a process water tank 71 arranged outside the shell 1, a process water pump 72 and a switch valve 73 through pipelines. Wherein, the process water tank 71 and the process water pump 72 can be shared with the wet dedusting spray. The spray washing dust collecting pole plate 2 can be realized by controlling the operation of the water circulation device 7 so as to realize on-line ash removal, and the ash removal period and frequency can be set through control logic. The flue gas is introduced into the shell 1 through the inlet horn 11, the flue gas is dedusted by the dust collecting device, the dedusted gas is further treated by the dust collecting polar plate 2 to meet the requirement of ultra-low emission, and the gas reaching the standard is directly discharged into the atmosphere through the outlet horn 12. When the dust is accumulated to a certain thickness, the dust collection efficiency is reduced, so that the dust needs to be regularly sprayed and washed to remove the attached dust, and the dust falling off by spraying and washing flows into the dust hopper 13 and is discharged out through the circulating water system. 316L, 2205 or 2507 stainless steel can be used as the material of the dust collecting pole plate 2.
Specific embodiment example 1: in a certain cogeneration 350MW unit project, the inlet flue gas volume of an electrostatic dust collector is as follows: 1246000 Nm/h, wherein the flue gas temperature at the inlet of the dust collector is 130 ℃, and the dust content at the inlet of the dust collector is 15 g/Nm, wherein two electrostatic dust collectors are matched with each furnace, and relevant parameters are shown in the accompanying drawing 10. The dust content of the outlet of the electrostatic dust collector is less than or equal to 30 mg/Nm 3 The design and the dust removal efficiency are 99.8 percent.
After three years of operation, the dust content is required to be less than or equal to 20 mg/Nm due to the improvement of the new emission standard 3 The reverse multi-stage eddy dry dust removal system is improved by combining the project with the application, and other parameters are unchanged. The dust content of the outlet of the modified dust remover is less than or equal to 18 mg/Nm 3 The dust removal efficiency is improved to 99.88%, the emission reaches the standard, the dust emission is reduced by about 15 kg per hour, and the dust emission is reduced by about 120 tons in total when the dust remover operates for 8000h all year.
Specific embodiment example 2: the flue gas volume of the inlet of a wet electrostatic dust collector after wet desulphurization in 330MW unit project of a certain power plant: 1320000 Nm/h, flue gas temperature at the inlet of the dust collector of 49 ℃ and dust content at the inlet of the dust collector of 30 mg/Nm, wherein each furnace is matched with one wet type electrostatic dust collector, and relevant parameters are shown in the attached drawing 11. The dust collector matched with the project construction has the dust content of less than or equal to 10 mg/Nm at the outlet of the wet electrostatic dust collector 3 Design, dust collection efficiency 66.67%.
Along with the improvement of the local flue gas dust emission index, the emission concentration is required to be reduced to less than or equal to 5 mg/Nm 3 The reverse multi-stage vortex wet dust removal system is improved by combining the project with the application, and other parameters are unchanged. The dust content of the outlet of the modified wet electrostatic dust collector is less than or equal to 4 mg/Nm 3 The dust removal efficiency is improved to 86.67 percentThe ultra-low emission standard requires that the dust emission is reduced by about 7.9 kg per hour, and the dust emission is reduced by about 63.2 tons in total when the device is operated for 8000 hours all year.
While embodiments of the present application have been illustrated and described above, it will be appreciated that the above embodiments are exemplary and are not to be construed as limiting the present application. Without departing from the spirit and scope of this application, there are also various changes and modifications that fall within the scope of the claimed application.
Claims (5)
1. The utility model provides a reverse multistage vortex dust pelletizing system, dust pelletizing system's casing (1) is equipped with import loudspeaker (11) and export loudspeaker (12) in the horizontal direction relatively, lays dust collecting device in casing (1), its characterized in that: the dust collecting pole plates (2) are arranged at the section of the outlet horn (12), each dust collecting pole plate (2) comprises two rows of first dust collecting pole plates (21) which are arranged in parallel and located at the upstream of gas flow and second dust collecting pole plates (22) located at the downstream of gas flow, each first dust collecting pole plate (21) and each second dust collecting pole plate (22) respectively comprise at least two concave groove plates (24) positioned on first angle steel (23), gaps (29) for gas to pass are formed between every two adjacent concave groove plates (24), two side edges (241) of each concave groove plate (24) are enclosed to form grooves (242), the end parts of the side edges (241) are semicircular curled edges (243), the semicircular curled edges (243) of the two side edges (241) are curled towards the grooves (242), and the grooves (242) of the concave groove plates (24) of the first dust collecting pole plates (21) and the second dust collecting pole plates (22) are arranged oppositely and in a staggered mode, the side edges (241) of the adjacent concave groove plates (24) of the first dust collecting polar plate (21) and the second dust collecting polar plate (22) extend into the opposite grooves (242), and the two semicircular curled edges (243) are matched with each other to form a vortex area (25) through which gas can enter and exit;
the concave groove plate (24) is fixed on the first angle steel (23) through a backing plate (26), wherein the backing plate (26) is located at the bottom of the groove (242), and the first connecting piece (27) penetrates through the backing plate (26) and the concave groove plate (24) and fixes the backing plate (26) and the concave groove plate (24) to the first angle steel (23);
the base plates (26) of the first dust collecting polar plate (21) and the second dust collecting polar plate (22) are fixedly connected through a positioning sleeve (28), so that the first dust collecting polar plate (21) and the second dust collecting polar plate (22) are connected into a whole;
the width of the concave groove plate (24) is K, K ranges from 100 mm to 300 mm, the height of the concave groove plate (24) is G, G ranges from 40 mm to 120 mm, G: k =0.4 ~ 1: 1;
gaps (29) serving as air inlet openings are formed among the concave groove plates (24) of the first dust collecting polar plate (21), gaps (29) serving as air outlet openings are formed among the concave groove plates (24) of the second dust collecting polar plate (22), the width of each gap (29) is D, and D is 50-150 mm; the gap between the adjacent concave groove plates (24) of the first dust collecting polar plate (21) and the second dust collecting polar plate (22) is S, and the S is 5-15 mm; the total thickness of the first dust collecting polar plate (21) and the second dust collecting polar plate (22) is H, and H is 55-170 mm; the radius of the semicircular curled edge (243) of the concave groove plate (24) is R, and R is 10 mm-35 mm;
the upper portion of the dust collecting pole plate (2) is connected with the wall surface of the outlet loudspeaker (12) through the first connecting device (3), the lower portion of the dust collecting pole plate (2) is connected with the wall surface of the outlet loudspeaker (12) through the second connecting device (4), and a spoiler (8) is arranged on the edge of the dust collecting pole plate (2).
2. The inverted multistage vortex dust removal system of claim 1, wherein: the concave groove plate (24) is a thin plate which is formed by rolling and has the thickness of 1.0 mm-1.5 mm.
3. The inverted multistage vortex dust removal system of claim 1, wherein: the first connecting device (3) comprises a positioning frame (31), a positioning installation angle steel (32) and a first connecting angle steel (33), a concave groove plate (24) of the dust collecting pole plate (2) is connected with the first connecting angle steel (33), the first connecting angle steel (33) is connected with the positioning installation angle steel (32), the positioning installation angle steel (32) is connected with the positioning frame (31), and the positioning frame (31) is fixed on the wall surface of the outlet horn (12) through a second connecting piece (34); the second connecting device (4) comprises second connecting angle steel (41) and a supporting frame (42), the concave groove plate of the dust collecting pole plate (2) is fixed on the supporting frame (42) through the second connecting angle steel (41), and the supporting frame (42) is fixed on the wall surface of the outlet horn (12).
4. The inverted multistage vortex dust removal system of claim 1, wherein: dust pelletizing system is dry-type dust pelletizing system, the next-door neighbour dust collecting polar plate (2) still be equipped with rapping device (5), rapping device (5) including rapping transmission, shake and beat the axle, shake and beat the hammer, shake through control rapping device (5) and shake and gather dust polar plate (2), realize online deashing, deashing cycle and frequency pass through control logic and set up, pole plate (2) the material that gathers dust uses Q235 steel.
5. The inverted multistage vortex dust removal system of claim 1, wherein: the dust pelletizing system is a wet dust pelletizing system, is close to the upper reaches of the dust collecting polar plate (2) still be equipped with nozzle (6), and water circulating device (7) is connected in nozzle (6), water circulating device (7) locate the outer technology water tank (71) of casing (1) through the tube coupling to and technology water pump (72), ooff valve (73), technology water tank (71) and technology water pump (72) spray the sharing with wet dust collection, spray through the operation of controlling water circulating device (7) and wash dust collecting polar plate (2), realize online deashing, deashing cycle and frequency pass through control logic setting, and 316L, 2205 or 2507 stainless steel are used to dust collecting polar plate (2) material.
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| CN202210432562.8A CN114522803B (en) | 2022-04-24 | 2022-04-24 | Reverse multistage vortex dust removal system |
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