CN110624320A - Microporous membrane dust remover based on rotary pulse dust removal and dust removal method - Google Patents
Microporous membrane dust remover based on rotary pulse dust removal and dust removal method Download PDFInfo
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- CN110624320A CN110624320A CN201910970959.0A CN201910970959A CN110624320A CN 110624320 A CN110624320 A CN 110624320A CN 201910970959 A CN201910970959 A CN 201910970959A CN 110624320 A CN110624320 A CN 110624320A
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- rotary pulse
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- 239000000428 dust Substances 0.000 title claims abstract description 130
- 239000012982 microporous membrane Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 117
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims description 69
- 238000004140 cleaning Methods 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000004887 air purification Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a microporous membrane dust remover for removing dust based on rotary pulse and a dust removing method, wherein the microporous membrane dust remover comprises a rotary pulse dust removing mechanism, an outlet pipe, a pattern plate, a filter material, an inlet pipe and an ash hopper; the flower plate is arranged in the microporous membrane dust collector for removing the dust based on the rotary pulse, and divides the interior of the microporous membrane dust collector for removing the dust based on the rotary pulse into an air purifying chamber and a filter material chamber, the air purifying chamber is arranged at the upper part of the filter material chamber, the filter material is fixedly arranged on the flower plate, and the filter material is arranged in the filter material chamber; the filter materials are arranged in a plurality of numbers and are annularly and uniformly distributed around the axis of the microporous membrane dust remover for removing the dust based on the rotary pulse; the filter material is made into a fan-shaped frame structure through a plate-shaped PTFE membrane filter material, and is integrally in a circular structure through annular arrangement; the PTFE microporous membrane filter material adopted by the filter material has stronger hydrophobicity, so that high-humidity dust is difficult to adhere to the surface of the filter material; meanwhile, the filter material is of an inward-folding structure, so that the filtering area is effectively increased.
Description
Technical Field
The invention relates to the technical field of dust removal equipment, in particular to a microporous film dust remover based on rotary pulse dust removal and a dust removal method.
Background
A large amount of smoke dust is generated in the production process of thermal power plants, steel plants, surface mines and the like, and the smoke dust is purified and qualified by purification equipment such as a dust remover and then is discharged into the atmosphere. The filter structure and the ash removal system of the dust remover have close relation with the dust removal effect of the dust remover, so the design and optimization of the filter structure and the ash removal system of the dust remover are an important step for enabling the performance of the dust remover to meet the national standard.
In the production process, the bag-type dust remover is not suitable for dust with high hygroscopicity or strong adhesiveness, and meanwhile, the dust removing temperature cannot be lower than the dew point temperature, otherwise, the problems of difficult dust removal or bag pasting and the like can be caused, and the discharge effect is influenced to a certain extent.
For a dust remover dust cleaning system, the dust cleaning mode mainly comprises a mechanical rapping dust cleaning mode and a pulse blowing dust cleaning mode, wherein the pulse blowing dust cleaning mode is that a pulse valve releases a short pulse, compressed air is distributed into a blowing pipe, a nozzle on the blowing pipe faces the upper part of an opening end of a filter material, the compressed air expands under the action of the nozzle to form pulse jet flow, and meanwhile, in an adjacent area around the pulse jet flow, jet flow gas can entrain surrounding air and the pulse jet flow to be sprayed into a filter material together to clean the filter material.
However, the mechanical rapping and pulse blowing ash removal modes adopted by the existing dust remover can hardly remove the high-humidity dust adhered to the surface of the filter material, and the problem of poor ash removal is easily caused.
In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.
Disclosure of Invention
In order to solve the technical defects, the invention adopts the technical scheme that the microporous membrane dust remover for removing dust based on rotary pulse comprises a rotary pulse dust removing mechanism, an outlet pipe, a pattern plate, a filter material, an inlet pipe and an ash hopper; the flower plate is arranged in the microporous membrane dust collector for removing the dust based on the rotary pulse, the interior of the microporous membrane dust collector for removing the dust based on the rotary pulse is divided into an air purifying chamber and a filter material chamber, the air purifying chamber is arranged at the upper part of the filter material chamber, the filter material is fixedly arranged on the flower plate, and the filter material is arranged in the filter material chamber; the ash hopper is arranged below the filtering chamber, the inlet pipe is arranged on the filtering chamber, and the outlet pipe is arranged on the air purifying chamber; the filter materials are arranged in a plurality of numbers and are annularly and uniformly distributed around the axis of the microporous membrane dust remover for removing the dust based on the rotary pulse; the filter material is made into a fan-shaped frame structure through a plate-shaped PTFE membrane-coated filter material, and is integrally of a circular structure through annular arrangement.
Preferably, the filter material one end sets up to open the end, just the card corresponds the open end of filter material is provided with the circulation mouth, the open end of filter material with the card sealing connection.
Preferably, both sides of the filter material are arranged to form an inward folding structure comprising an inner side and an outer side, and the distance between the inner side and the axis of the microporous membrane dust collector for cleaning ash based on rotary pulse is smaller than the distance between the outer side and the axis of the microporous membrane dust collector for cleaning ash based on rotary pulse.
Preferably, on the same filter material, at the connecting position of the inner side edge and the outer side edge, the size of a gap between the two inner side edges is smaller than that between the two outer side edges, so that an inner folded edge is formed at the connecting position of the inner side edge and the outer side edge.
Preferably, a plurality of guide plates are arranged below the filter material and correspond to the inlet pipe, and the height of each guide plate is increased along with the increase of the distance from the inlet pipe.
Preferably, the rotary pulse ash removal mechanism comprises an air storage tank, a compressed air inlet pipe, an electromagnetic pulse valve, an upper connecting pipe, a gear box, a rotary driving motor, a transmission gear, a lower connecting pipe, a supporting rod and an injection pipe; the rotary pulse ash cleaning mechanism is arranged along the central axis of the microporous membrane dust collector for cleaning ash based on rotary pulse, the lower connecting pipe, the supporting rod and the blowing pipe are arranged at the inner side of the air purifying chamber, the blowing pipe is connected with the lower connecting pipe and is reinforced through the supporting rod, the upper connecting pipe, the rotary driving motor, the gear box, the transmission gear, the air storage tank, the electromagnetic pulse valve and the compressed air inlet pipe are arranged at the outer side of the air purifying chamber, the compressed air inlet pipe is connected above the air storage tank, the electromagnetic pulse valve is connected below the air storage tank, the upper connecting pipe is connected with the electromagnetic pulse valve, the upper connecting pipe is connected with the lower connecting pipe, the transmission gear is connected with a gear arranged at the top end of the lower connecting pipe, the rotary driving motor drives the transmission gear to rotate through the gear box, so that the lower connecting pipe rotates.
Preferably, 3 injection pipes are arranged, and the included angle between every two adjacent injection pipes is 120 degrees; the blowing pipe is arranged along the pipe diameter reducing direction far away from the lower connecting pipe, the diameter of the section of the head end of the blowing pipe is 6cm, and the diameter of the section of the tail end of the blowing pipe is 3 cm.
Preferably, the blowing pipe is provided with a nozzle; the nozzle is a conical nozzle, and the diameter of the nozzle is 1.5 cm; the inner side position and the outer side position of the filter material are correspondingly provided with a plurality of nozzles, and the distance between the nozzles on the same blowing pipe is equal.
Preferably, the inlet pipe and the outlet pipe are respectively provided with a parameter measuring device at the inner side of the pipe wall, the parameter measuring devices measure parameters and feed the parameters back to the PLC control unit, the pressure difference between the inlet pipe and the outlet pipe in the parameters is used for the PLC control unit to control the ash removal mode of the rotary pulse ash removal mechanism, and the PLC control unit is used for controlling the working state of the rotary pulse ash removal mechanism.
Preferably, the rotary pulse ash removal mechanism has four ash removal modes according to pressure difference control: no blowing, low speed, medium speed and fast speed; the PLC control unit controls the gear box through the received pressure difference to adjust the rotating speed of the blowing pipe, so that the blowing interval is adjusted; when the detected pressure difference is less than 800Pa, the rotary pulse ash removal mechanism does not work and is in a non-blowing mode; when the detected pressure difference is 801-1500 Pa, a low-speed ash removal mode is adopted, the ash removal interval is 5min, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is 1501-1800 Pa, a medium-speed deashing mode is adopted, the deashing interval is 30s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is more than 1801Pa, a rapid ash removal mode is adopted, the ash removal interval is 5s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa.
Compared with the prior art, the invention has the beneficial effects that: 1, PTFE microporous membrane filter materials adopted by the filter materials have higher hydrophobicity, so that high-humidity dust is difficult to adhere to the surfaces of the filter materials; meanwhile, the filter material is arranged into an inward-folded structure, so that the filtering area is effectively increased; 2, a rotary pulse blowing dust removal system is adopted for dust removal, so that the problem of poor dust removal effect caused by difficulty in removing high-humidity dust adhered to the surface of the filter material in a mechanical vibration dust removal mode is solved; and 3, the adopted blowing mechanism only comprises one electromagnetic pulse valve, so that the problem of large quantity of pulse valves of the traditional pulse blowing system is solved, the overhauling difficulty of the system is reduced, and the initial investment of the system is reduced.
Drawings
FIG. 1 is a structural view of the microporous membrane dust collector for rotary pulse-based dust removal;
FIG. 2 is a structural view of a single sheet of the filter material;
FIG. 3 is a view of the arrangement structure of the filter material;
FIG. 4 is a structural view of the multi-well plate;
FIG. 5 is a structural view of the rotary pulse ash removal mechanism;
FIG. 6 is a top view of the filter media.
The figures in the drawings represent:
1-rotating pulse ash cleaning mechanism; 2-air purification chamber; 3-an outlet pipe; 4-a parameter measuring device; 5-pattern plate; 6-filtering materials; 7-a filter material chamber; 8-a flow guide plate; 9-an inlet pipe; 10-a perforated plate; 11-ash bucket; 12-a gas storage tank; 13-compressed air inlet pipe; 14-an electromagnetic pulse valve; 15-upper connecting pipe; 16-a gearbox; 17-a rotary drive motor; 18-a transmission gear; 19-lower connecting pipe; 20-a support bar; 21-a blowing pipe; 22 nozzle.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
Example one
FIG. 1 is a structural view of the microporous membrane dust collector for rotary pulse-based dust removal, as shown in FIG. 1; the microporous membrane dust remover for removing dust based on rotary pulse comprises a rotary pulse dust removing mechanism 1, an outlet pipe 3, a flower plate 5, a filter material 6, an inlet pipe 9 and an ash bucket 11; flower plate 5 set up in be used for the inside based on the micropore membrane dust remover of rotatory pulse deashing, and will be the internal partitioning for being based on the micropore membrane dust remover of rotatory pulse deashing is air-purifying chamber 2 and filter material room 7, air-purifying chamber 2 set up in the upper portion of filter material room 7, filter material 6 is fixed to be set up on the flower plate 5, just filter material 6 sets up in the filter material room 7.
The ash hopper 11 is arranged below the filter material chamber 7 and used for collecting the smoke dust in the microporous membrane dust remover for removing ash based on rotary pulse; the inlet pipe 9 is arranged on the filter material chamber 7, the outlet pipe 3 is arranged on the air purifying chamber 2, and the flue gas to be dedusted enters the filter material chamber 7 through the inlet pipe 9, is filtered by the filter material 6, enters the air purifying chamber 2, and is discharged through the outlet pipe 3.
As shown in fig. 2 and 3, fig. 2 is a structural view of a single piece of filter material; FIG. 3 is a view of the arrangement structure of the filter material; the filter material 6 is a plate-shaped PTFE membrane filter material, and has strong hydrophobicity, so that high-humidity dust is difficult to adhere to the surface of the filter material 6; the filter material 6 is set to be a plurality of, and the filter material 6 winds the shaft line annular uniform distribution of the microporous membrane dust remover for cleaning dust based on rotary pulse. The filter material 6 is made into a fan-shaped frame structure through a plate-shaped PTFE membrane filter material, is integrally of a circular structure through annular arrangement, and is arranged at equal intervals between adjacent filter materials 6. The filter material 6 one end is opened and set up, just the card 5 corresponds the opening end of filter material 6 is provided with the circulation mouth, the opening end of filter material 6 with card 5 sealing connection to make the flue gas in the filter material room 7 need pass through filter material 6 filters behind the dust removal again from the circulation mouth gets into in the air-purifying chamber 2.
Generally, two side edges of the filter material 6 are folded inwards to form an inner side edge and an outer side edge, and the inner side edge is closer to the axis of the microporous membrane dust remover for removing dust based on rotary pulse than the outer side edge; preferably, in the same filter material 6, at the connecting position of the inner side edge and the outer side edge, the gap size between the two inner side edges is smaller than the gap size between the outer side edges, so that an inner folded edge is formed at the connecting position of the inner side edge and the outer side edge, the gap between the adjacent filter materials 6 at the inner side edge is prevented from being too small, and the filtering area is conveniently and effectively increased.
Meanwhile, the filter materials 6 are arranged around the circle center, the middle interval of the outer ring of the filter materials 6 is larger than that of the inner ring, the inner space of the dust remover is effectively utilized, the filtering area is increased, meanwhile, the filter materials 6 are arranged to be fan-shaped structures, so that the filter materials are convenient to produce, maintain and replace, and the fan-shaped filter materials 6 are combined into a circular structure, so that the rotary pulse dust cleaning device is convenient to arrange. Compare with current rotary pulse deashing sack cleaner, under the condition that nozzle number and jetting pipe length are the same, this structure filter area is greater than the sack cleaner, and compares with traditional sack cleaner, and micropore membrane dust remover filter material hydrophobicity is stronger, has avoided the emergence of the bag phenomenon of pasting in the operation process.
The lower part of the filter material 6 is provided with a guide plate 8 corresponding to the inlet pipe 9, so that the flue gas entering from the inlet pipe 9 can uniformly pass through the filter material 6 under the diversion of the guide plate 8, and the dust removal effect of the microporous membrane dust remover for removing dust based on rotary pulse is improved.
As shown in fig. 4, fig. 4 is a structural view of the multi-well plate; still be provided with perforated plate 10 in the import pipe 9 for realize the primary filter to the large granule dust, avoid the influence of large granule dust to the filter material simultaneously. Holes in the porous plate 10 are arranged to be sparse at the upper part and dense at the lower part; the four guide plates 8 are arranged, the installation height of each guide plate 8 is different, and the guide plates are arranged in a way that the height is higher as the distance from the inlet pipe 9 is farther.
Meanwhile, the arrangement of the porous plate 10 and the guide plate 8 prevents dusty airflow from directly washing the filter material 6, so that the service life of the filter material 6 is prolonged; and the perforated plate 10 and the guide plate 8 can play a role of uniformly distributing air flow, so that the filtering efficiency of the dust remover is improved.
Example two
As shown in FIG. 5, FIG. 5 is a structural view of the rotary pulse ash removal mechanism; the rotary pulse ash cleaning mechanism 1 comprises an air storage tank 12, a compressed air inlet pipe 13, an electromagnetic pulse valve 14, an upper connecting pipe 15, a gear box 16, a rotary driving motor 17, a transmission gear 18, a lower connecting pipe 19, a supporting rod 20 and a blowing pipe 21.
The rotary pulse ash removal mechanism 1 is arranged along the central axis of the microporous membrane dust remover for removing ash based on rotary pulse, wherein the lower connecting pipe 19, the supporting rod 20 and the blowing pipe 21 are arranged at the inner side of the air purification chamber 2, the blowing pipe 21 is connected with the lower connecting pipe 19 and reinforced by using the supporting rod 20, the supporting rod 20 and the blowing pipe 21 form an included angle of 60 degrees, the upper connecting pipe 15, the rotary driving motor 17, the gear box 16, the transmission gear 18, the air storage tank 12, the electromagnetic pulse valve 14 and the compressed air inlet pipe 13 are arranged at the outer side of the air purification chamber 2, the compressed air inlet pipe 13 is connected above the air storage tank 12, the electromagnetic pulse valve 14 is connected below the air storage tank 12, and the upper connecting pipe 15 is connected with the electromagnetic pulse valve 14, the upper connecting pipe 15 is connected with the lower connecting pipe 19, the transmission gear 18 is connected with a gear installed at the top end of the lower connecting pipe 19, and the rotary driving motor 17 drives the transmission gear 18 to rotate through the gear box 16, so that the lower connecting pipe 19 rotates.
Preferably, the upper connecting pipe 15, the lower connecting pipe 19 and the blowing pipe 21 are designed as circular pipes, so that the resistance of the rotary pulse ash removal mechanism 1 is reduced, and the blowing effect is improved.
3 blowing pipes 21 are arranged, and the included angles of the adjacent blowing pipes 21 are 120 degrees; the blowing pipe 21 is arranged in a mode of reducing the pipe diameter, the diameter of the section of the head end of the blowing pipe 21 is 6cm, and the diameter of the section of the tail end of the blowing pipe 21 is 3 cm.
The blowing pipe 21 is provided with a nozzle 22; in the present embodiment, the nozzle 22 is a conical nozzle, and the diameter of the nozzle 22 is about 1.5 cm; and each said blowing pipe corresponds to said filter media 6 and arranges 12 said spray nozzles 22 altogether, set up 6 said spray nozzles 22 to correspond to inside edge position and outside edge position of said filter media 6 respectively; the distance between the nozzles 22 is equal in the same blowing pipe 21.
The blowing pipe 21 adopts a structure with a gradually reduced pipe diameter, the nozzles 22 adopt a conical structure, and the nozzles 22 adopt an equidistant design, so that the uniform and consistent flow of each nozzle 22 is ensured, the airflow is prevented from being accumulated in a certain area, and the service life of the filter material 6 is prolonged; simultaneously, the dust cleaning effect of the outer side edge of the filter material 6 is ensured, and the problem that the dust cleaning effect is poor due to insufficient flow is avoided.
In the invention, in order to ensure a good ash removal effect, the gas flow Q 'passing through the filter material 6 needs to be equal to the gas flow Q of the jet section, wherein the gas flow Q' passing through the filter material 6 is the gas flow required by the microporous membrane filter material during ash removal, the gas flow Q of the jet section is the flow of gas on a certain jet section after the gas is sprayed out from the nozzle, and the jet section is a certain cross section of the gas jet.
Wherein, the expression of the gas flow Q' passing through the microporous membrane filter material is as follows:
wherein A is the filtration area;is the back blowing air speed formed by the blowing air flow in the filter material.
The expression of the jet flow section gas flow Q is as follows:
wherein c is a turbulence coefficient, and is generally 0.076; d0Is the exit aperture of the nozzle; s is the distance from the nozzle to the jet section; q0Is the flow rate of the nozzle.
Preferably, as shown in fig. 6, fig. 6 is a top view of the filter material, for clearly expressing the icon indication, the size selection difference between the inner side and the outer side is larger, generally, a single filter material 6 has a cross section similar to a sector, so that the intersection of the extension lines of the two inner sides is a first circle center, and the intersection of the extension lines of the two outer sides is a second circle center; the connecting line of the first circle center and two end points of the inner arc is a first auxiliary line, the connecting line of the first circle center and two end points of the outer arc is a second auxiliary line, the connecting line of the first circle center and the outer end point of the inward-folding position is a third auxiliary line, and the connecting line of the second circle center and the outer end point of the inward-folding position is a fourth auxiliary line.
Therefore, for the filtering area A of a single filtering material, the expression is as follows:
wherein, theta0Is the included angle of the two outer side edges; theta1Is the included angle of the two inner side edges; theta2Is the included angle between the two second auxiliary lines; theta3Is the included angle between the inner side edge and the third auxiliary line; h is the height of the filter material; 1 is the length of the second auxiliary line; l0Is the length of the first auxiliary line; l' is the length of the fourth auxiliary line. Wherein theta is0＝θ1。
The flow rate Q of the nozzle0The expression of (a) is:
in the formula, n is the number of the nozzles which simultaneously spray gas to the filter material; xi is the flow coefficient on the nozzle section; d0Is the exit aperture of the nozzle; v. of0Is the velocity of the gas emitted from the nozzle.
Due to the fact that
Q′＝Q
The flow rate Q' of gas passing through the filter materialThe expression of the gas flow Q of the jet section can obtain the outlet aperture d of the nozzle0The expression of (a) is:
diameter D of inlet of blowing pipe0The expression of (a) is:
in the formula, C is a coefficient and is generally 50-60%.
Through the expression, the structure and the size of the filter material 6 and the rotary pulse ash removal mechanism 1 can be matched, so that the filtering and ash removal capacity of the microporous membrane dust remover is improved.
The rotary pulse dust removal mechanism 1 is adopted for dust removal, so that the problem of poor dust removal effect caused by difficulty in removing high-humidity dust adhered to the surface of a filter material in a mechanical vibration dust removal mode in the prior art is solved; meanwhile, the adopted rotary pulse ash removal mechanism 1 only comprises one electromagnetic pulse valve 14, so that the problem of large quantity of pulse valves of the traditional pulse blowing system is solved, the overhauling difficulty of the system is reduced, and the initial investment of the system is reduced.
EXAMPLE III
And the inner sides of the pipe walls of the inlet pipe 9 and the outlet pipe 3 are respectively provided with a parameter measuring device 4. The parameter measuring device 4 can measure parameters such as flue gas flow rate, humidity, temperature and pressure and feed the parameters back to the PLC control unit, wherein the measured pressure difference between the inlet pipe 9 and the outlet pipe 3 is used for the PLC control unit to control the ash removal mode of the rotary pulse ash removal mechanism 1. And the PLC control unit is used for controlling the working state of the rotary pulse ash removal mechanism 1.
The rotary pulse ash removal mechanism 1 has four ash removal modes according to pressure difference control: no blowing, low speed, medium speed and fast speed. Specifically, the PLC control unit controls the gear box through the received pressure difference to adjust the rotation speed of the blowing pipe 21, thereby adjusting the blowing interval.
When the detected pressure difference is less than 800Pa, the rotary pulse ash removal mechanism 1 does not work and is in a non-blowing mode; when the detected pressure difference is 801-1500 Pa, a low-speed ash removal mode is adopted, the ash removal interval is 5min, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is 1501-1800 Pa, a medium-speed deashing mode is adopted, the deashing interval is 30s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is more than 1801Pa, a rapid ash removal mode is adopted, the ash removal interval is 5s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa.
The PLC control unit is adopted to control the dust cleaning modes of the rotary pulse dust cleaning mechanism 1 through pressure difference, four dust cleaning modes are provided, dust cleaning can be carried out according to the condition of load on the filter material, the lowest dust remover resistance is guaranteed to be kept in the whole service life of the filter material 6, and meanwhile the service life of the filter material can be prolonged.
Generally, the time control is adopted for the ash removal control of the PLC control unit as a standby, when the parameter measuring device 4 fails and cannot feed back parameters, the time control can be adopted, and the ash removal interval is manually set, so that the system is prevented from stopping working due to failure. The time control mode is adopted as the standby ash removal control mode, so that the ash removal system is prevented from stopping working due to the fault of the pressure difference control mode, the dust remover stops running, and some economic losses are caused.
The specific operation process is as follows: the flue gas enters the dust remover from the inlet pipe 9, is filtered by the filter material 6, enters the air purifying chamber 2 through the flower plate 5, and is discharged out of the dust remover through the outlet pipe 3. When the dust remover operates, the parameter measuring device 4 in the outlet pipe 3 collects parameters in real time and feeds the parameters back to the PLC controller, the PLC controller sets a dust removing mode of the dust remover through pressure difference so as to control the rotation speed of the blowing pipe 21 by controlling the gear box 16, the rotary driving motor 17 drives the transmission gear 18 to rotate through the gear box 16, and finally the lower connecting pipe 19 and the connected blowing pipe 21 rotate, when the blowing pipe 21 rotates to the central position of the flow opening, the electromagnetic pulse valve 14 is opened, compressed air in the air storage tank 12 is sent into the blowing pipe 21 through the upper connecting pipe 15 and the lower connecting pipe 19, the compressed air is sprayed out through the nozzle 22, the filter material 6 rapidly expands outwards, and a dust layer adsorbed on the filter material 6 falls off, fall into the ash hopper 11 to achieve the purpose of cleaning ash.
The foregoing is merely a preferred embodiment of the invention, which is intended to be illustrative and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A microporous membrane dust remover for removing dust based on rotary pulse is characterized by comprising a rotary pulse dust removing mechanism, an outlet pipe, a pattern plate, a filter material, an inlet pipe and an ash bucket; the flower plate is arranged in the microporous membrane dust collector for removing the dust based on the rotary pulse, the interior of the microporous membrane dust collector for removing the dust based on the rotary pulse is divided into an air purifying chamber and a filter material chamber, the air purifying chamber is arranged at the upper part of the filter material chamber, the filter material is fixedly arranged on the flower plate, and the filter material is arranged in the filter material chamber; the ash hopper is arranged below the filtering chamber, the inlet pipe is arranged on the filtering chamber, and the outlet pipe is arranged on the air purifying chamber; the filter materials are arranged in a plurality of numbers and are annularly and uniformly distributed around the axis of the microporous membrane dust remover for removing the dust based on the rotary pulse; the filter material is made into a fan-shaped frame structure through a plate-shaped PTFE membrane filter material, and is integrally in a circular structure through annular arrangement.
2. The microporous membrane dust collector for rotary pulse ash removal according to claim 1, wherein one end of the filter material is provided as an open end, the flow port is arranged on the flower plate corresponding to the open end of the filter material, and the open end of the filter material is hermetically connected with the flower plate.
3. The microporous membrane dust collector for removing ash based on rotary pulse according to claim 2, wherein both sides of the filter material are configured to include an inward-folded structure formed by an inner side and an outer side, and the distance between the inner side and the axis of the microporous membrane dust collector for removing ash based on rotary pulse is smaller than the distance between the outer side and the axis of the microporous membrane dust collector for removing ash based on rotary pulse.
4. A microporous dust collector for ash based on rotary pulse dust removal according to claim 3, wherein the size of the gap between the inner edges is smaller than the size of the gap between the outer edges at the connecting position of the inner edges and the outer edges on the same filter material, so that the inner folds are formed at the connecting position of the inner edges and the outer edges.
5. The microporous membrane dust collector for rotary pulse ash removal according to claim 1, wherein a plurality of flow deflectors are arranged below the filter material corresponding to the inlet pipe, and the height of the flow deflectors increases with increasing distance from the inlet pipe.
6. The microporous film dust collector for removing dust based on rotary pulse according to claim 1, wherein the rotary pulse dust removing mechanism comprises an air storage tank, a compressed air inlet pipe, an electromagnetic pulse valve, an upper connecting pipe, a gear box, a rotary driving motor, a transmission gear, a lower connecting pipe, a supporting rod and an injection pipe; the rotary pulse ash cleaning mechanism is arranged along the central axis of the microporous membrane dust collector based on rotary pulse ash cleaning, the lower connecting pipe, the supporting rod and the blowing pipe are arranged at the inner side of the air purifying chamber, the blowing pipe is connected with the lower connecting pipe and is reinforced through the supporting rod, the upper connecting pipe, the rotary driving motor, the gear box, the transmission gear, the air storage tank, the electromagnetic pulse valve and the compressed air inlet pipe are arranged at the outer side of the air purifying chamber, the compressed air inlet pipe is connected above the air storage tank, the electromagnetic pulse valve is connected below the air storage tank, the upper connecting pipe is connected with the electromagnetic pulse valve, the upper connecting pipe is connected with the lower connecting pipe, the transmission gear is connected with a gear arranged at the top end of the lower connecting pipe, the rotary driving motor drives the transmission gear to rotate through the gear box, so that the lower connecting pipe rotates.
7. The microporous film dust collector for removing ash based on rotary pulse as claimed in claim 6, wherein the number of the blowing pipes is 3, and the included angles between adjacent blowing pipes are 120 degrees; the blowing pipe is arranged along the pipe diameter reducing direction far away from the lower connecting pipe, the diameter of the section of the head end of the blowing pipe is 6cm, and the diameter of the section of the tail end of the blowing pipe is 3 cm.
8. The microporous film dust collector for ash removal based on rotary pulse as claimed in claim 6, wherein the blowing pipe is provided with a nozzle; the nozzle is a conical nozzle, and the diameter of the nozzle is 1.5 cm; the inner side position and the outer side position of the filter material are correspondingly provided with a plurality of nozzles, and the distance between the nozzles on the same blowing pipe is equal.
9. The dedusting method of the microporous membrane deduster based on the rotary pulse deashing according to any one of claims 1 to 8, wherein parameter measuring devices are respectively arranged on the inner sides of the pipe walls of the inlet pipe and the outlet pipe, the parameter measuring devices measure parameters and feed the parameters back to a PLC control unit, the pressure difference between the inlet pipe and the outlet pipe in the parameters is used for the PLC control unit to control the deashing mode of the rotary pulse deashing mechanism, and the PLC control unit is used for controlling the working state of the rotary pulse deashing mechanism.
10. The dust removal method of claim 9, wherein the rotary pulse ash removal mechanism has four ash removal modes according to pressure difference control: no blowing, low speed, medium speed and fast speed; the PLC control unit controls the gear box through the received pressure difference to adjust the rotating speed of the blowing pipe, so that the blowing interval is adjusted; when the detected pressure difference is less than 800Pa, the rotary pulse ash removal mechanism does not work and is in a non-blowing mode; when the detected pressure difference is 801-1500 Pa, a low-speed ash removal mode is adopted, the ash removal interval is 5min, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is 1501-1800 Pa, a medium-speed deashing mode is adopted, the deashing interval is 30s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa; when the detected pressure difference is more than 1801Pa, a rapid ash removal mode is adopted, the ash removal interval is 5s, the pulse time is 200ms, and the blowing pressure is 0.2 MPa.
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| CN201910970959.0A CN110624320B (en) | 2019-10-12 | 2019-10-12 | Microporous membrane dust remover based on rotary pulse ash removal and dust removal method |
| NL2025879A NL2025879B1 (en) | 2019-10-12 | 2020-06-21 | Microporous membrane dust collector for dust removal based on rotary pulse and dust removal method therefor |
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| CN201910970959.0A CN110624320B (en) | 2019-10-12 | 2019-10-12 | Microporous membrane dust remover based on rotary pulse ash removal and dust removal method |
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| CN111643989A (en) * | 2020-05-06 | 2020-09-11 | 徐州徐工环境技术有限公司 | Automatic pulse dust removal cleaning system and method based on pressure detection |
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Also Published As
| Publication number | Publication date |
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| CN110624320B (en) | 2024-07-26 |
| NL2025879A (en) | 2021-04-23 |
| NL2025879B1 (en) | 2021-05-03 |
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