CN111544973B - Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device - Google Patents
Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device Download PDFInfo
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- CN111544973B CN111544973B CN202010263946.2A CN202010263946A CN111544973B CN 111544973 B CN111544973 B CN 111544973B CN 202010263946 A CN202010263946 A CN 202010263946A CN 111544973 B CN111544973 B CN 111544973B
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- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- 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
- B01D46/0001—Making filtering elements
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- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
- B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A bag bottom reinforced filter bag dust cleaning method with a variable inner channel and a filter device are used for strengthening filter bag dust cleaning. The method comprises the following steps: the ash removal airflow is introduced into the filter bag, the cross section area of the inner channel of the filter bag is reduced along the direction from the opening of the filter bag to the bottom of the filter bag, and the ash removal airflow flows to the bottom of the filter bag, so that the cross section area of the channel in the filter bag is continuously reduced, the filter bag continuously compresses the ash removal airflow, and the impact pressure and the impact speed of the ash removal airflow are improved. The device includes that cage skeleton and skeleton press the cover, is equipped with sack and cage skeleton laminating in the outside cover of cage skeleton, and the cage skeleton includes cohesion connecting piece and 3 piece at least V-arrangement steel gardens, and one end is fixed in cohesion connecting piece and forms the inside sunken cavity of toper, and the other end draws in the skeleton presses in the cover, is equipped with sack tensioning slider in the inside sunken cavity of toper, and the pot head of sack is on the skeleton is pressed, and the other end draws in sack tensioning slider, along with sack tensioning slider embedding toper inside sunken cavity and by the one end in V-arrangement steel garden is fastened.
Description
Technical Field
The invention relates to a bag bottom reinforced filter bag dust cleaning method and a filter device with variable inner channels for a bag type dust collector, which can enhance the dust cleaning effect and uniformity, improve the area of a filter bag in unit volume and reduce the floor area and the manufacturing cost of the bag type dust collector.
Background
The bag type dust collector is a main and key device for treating smoke particulate matters, has about one hundred years of history in industrial application, has extremely large demand, and can generate great social and economic benefits by improving the collection area of unit volume, enhancing the dust cleaning effect and the like.
Most of the existing bag type dust collectors adopt pulse dust removal and a small amount of air blowback dust removal, and both dust removal modes utilize dust removal airflow, and the dust removal mode mainly changes the normal operation state, causes instantaneous positive pressure and shaking in a filter bag, and dust drops out of the filter bag to realize dust removal. The main factors influencing the ash removal effect include two points: (1) the pressure peak value in the filter bag during dust removal is related to the dust removal air flow of the channel sectional area in the unit filter bag, and for a certain amount of dust removal air flow, the smaller the channel sectional area in the filter bag is, the larger the pressure peak value is, the better the dust removal effect is; (2) the rising speed of the pressure in the filter bag is positively correlated with the axial speed of the ash removing airflow, and the ash removing effect is better when the axial speed of the ash removing airflow is higher and the rising speed of the pressure in the filter bag is higher.
However, the filter bag and cage frame of the prior bag-type dust collector basically adopt a straight cylinder type, as shown in fig. 8, the following problems exist in the structural form:
(1) because the filter bag is in a straight tube form, the upper and lower sectional areas are the same, after the ash removing airflow is introduced, the axial speed of the ash removing airflow at the upper part in the filter bag is larger, when the filter bag moves axially downwards, a part of the ash removing airflow passes through the filter bag, the ash removing airflow flow is reduced, the axial speed of the ash removing airflow is reduced, the rising speed of the pressure in the filter bag is reduced, and the ash removing effect at the bottom of the filter bag is poorer than that at the middle part. And the ash removal air flow at the lower part of the filter bag is less, the sectional area of a channel in the filter bag is not changed, so that the pressure peak value in the filter bag is reduced, and especially under the conditions that particulate matters are easy to absorb moisture, the moisture content of flue gas is large, the length of the filter bag is large and the like, the bottom ash removal effect is poor. For example, a long filter bag type dust collector for treating waste incineration flue gas has high flue gas moisture content, and the filter bag is often stuck by particulate matters at the bottom of the filter bag, so that the dust collection effect and the normal operation of equipment are influenced.
(2) The filter area of the filter bag of the common bag type dust collector is large, the equipment manufacturing cost, the installation cost and the civil engineering cost of the bag type dust collector are high, the existing filter bag is in a straight cylinder form, the volume space in the filter bag is large, the filter bag is not utilized, and the waste is useless.
Disclosure of Invention
The invention provides a bag bottom reinforced filter bag dust cleaning method and a filter device with variable internal channels for a bag type dust collector, which can strengthen the dust cleaning effect of a filter bag, particularly can effectively improve the uniformity of the pressure peak distribution of the side wall of a filter cylinder along the length direction, and ensure that all parts of the filter bag have the same dust cleaning strength.
The invention adopts the following technical scheme:
the invention relates to a bag bottom reinforced filter bag dust cleaning method with a variable inner channel, which comprises the following steps: the method comprises the following steps of taking a filter bag and enabling an inner channel in the filter bag through which ash removal airflow flows to be variable, wherein the inner channel is variable, the cross section area of the inner channel is reduced along the direction from the opening of the filter bag to the bottom of the filter bag, and in the process that the ash removal airflow enters the filter bag and flows to the bottom of the filter bag, the cross section area of the inner channel of the filter bag is continuously reduced, so that the filter bag continuously compresses the ash removal airflow, the impact pressure and the impact speed of the ash removal airflow are improved, the ash removal at the bottom of the filter bag is strengthened, and dust particles adhered to the bottom of the filter bag are removed.
The invention relates to a filtering device of a bag bottom enhanced filter bag dust removal method with a variable inner channel, which comprises a cage framework and a framework pressing sleeve, wherein a cloth bag is sleeved outside the cage framework and is attached to the cage framework, the cage framework comprises a cohesive connecting piece and at least 3V-shaped steel circles, one end of each V-shaped steel circle is fixed on the cohesive connecting piece and is enclosed to form a conical inwards concave cavity, the other end of each V-shaped steel circle is folded in the framework pressing sleeve, a detachable cloth bag tensioning sliding block is arranged in the conical inwards concave cavity, one end of each cloth bag is sleeved on the framework pressing sleeve, and the other end of each cloth bag is folded in the cloth bag tensioning sliding block and is embedded into the conical inwards concave cavity along with the cloth bag tensioning sliding block and is fastened by one end of the V-shaped steel circle.
Has the advantages that: compared with the prior art, the invention has the following advantages:
aiming at the problems that in the ash removing process of the ash removing airflow of the filter bag of the bag type dust remover in the prior art, the strength of the airflow of the ash removing airflow along the flowing direction (namely flowing to the bottom of the filter bag) is weakened, the impact is reduced and the impact speed is reduced, the technical measure that the cross sectional area of an inner channel is reduced along the direction from the opening of the filter bag to the bottom of the filter bag is adopted, the ash removing airflow flowing to the bottom of the filter bag is compressed by utilizing the filter bag which is gradually reduced, and the impact strength and the impact speed of the airflow are kept or even improved, so that high-viscosity particles firmly attached to the lower part of the filter bag can be removed.
(1) W-shaped filter bag and cage skeleton, as shown in figure 9, all set up the filter bag entrapment face in cage skeleton inside and outside, the lower part sectional area of passageway in the filter bag reduces, when the deashing air current draws in, has improved the deashing air current axial velocity of filter bag bottom deashing air current and the deashing gas flow of unit filter bag inner channel sectional area, and pressure peak value and pressure rising speed all obtain promoting in the filter bag bottom, have strengthened the deashing effect of filter bag bottom, can be used to the entrapment of the particulate matter that the deashing degree of difficulty is big of extra long filter bag and deashing. The application in the project of drying sludge by flue gas shows that: under the conditions that the particles are easy to absorb moisture and the moisture content of the flue gas is large, the bottom ash removal effect is still good.
(2) The filter bag trapping surfaces are arranged on the inner portion and the outer portion of the cage framework, so that the area of a filter bag in unit volume is increased by more than 50%, the volume of the bag type dust collector is reduced by more than 50% for the same smoke treatment amount, and the occupied area of equipment and the equipment manufacturing and installing cost of the bag type dust collector are reduced.
(3) The V-shaped steel circle is adopted, one end of the V-shaped steel circle is fixed on the cohesive connecting piece, the other end of the V-shaped steel circle is folded in the V-shaped steel circle of the framework pressing sleeve, the filter bag with the sectional area of the inner channel gradually reduced along the direction from the opening of the filter bag to the bottom of the filter bag, namely the filter bag with the large top and the small bottom is formed, the dust cleaning airflow is pressurized and accelerated by utilizing the filter bag with the large top and the small bottom, and therefore the dust cleaning effect of the filter bag of the bag type dust collector is enhanced. The V-shaped steel circle can also be used for forming a W-shaped filter bag and a cage framework, the trapping surface is arranged in the filter bag, the sectional area of a channel in the filter bag is changed, the sectional area of a channel in the lower part is reduced, and the pressure rise speed in the filter bag is improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a cross-sectional view taken along line K-K in FIG. 1.
Fig. 3 is a sectional view taken along line G-G in fig. 1.
Fig. 4 is a sectional view taken along line F-F in fig. 1.
Fig. 5 is an enlarged view at E in fig. 1.
Fig. 6 is an enlarged view at M in fig. 1.
Fig. 7 is a sectional view taken along line H-H in fig. 6.
FIG. 8 is a schematic diagram of a conventional filter bag and cage framework and a flow field diagram of ash removal airflow.
FIG. 9 is a schematic diagram of the filter bag and cage framework and a flow field diagram of ash removal air flow, wherein arrows indicate the direction of ash removal air flow.
In the figure: the device comprises a bag, 2-V-shaped steel circles, 3-bag tensioning sliding blocks, 4-cohesive connecting pieces, 5-bag type dust collector partition plates, 6-framework pressing sleeves, 7-nuts, 8-inverse-tooth nuts, 9-upper elastic rings, 10-lower elastic rings, 11-temperature-resistant ropes and 12-bolts.
Detailed Description
The following description of the embodiments and the resultant benefits and effects of the present invention, taken in conjunction with the accompanying drawings, are provided to assist the reader in better understanding the spirit and nature of the present invention, and are not to be construed as limiting the scope of the invention.
Example 1
A bag bottom reinforced type filter bag dust removal method with a variable inner channel comprises the following steps: the method comprises the following steps of taking a filter bag and enabling an inner channel in the filter bag through which ash removal airflow flows to be variable, wherein the inner channel is variable, the cross section area of the inner channel is reduced along the direction from the opening of the filter bag to the bottom of the filter bag, and in the process that the ash removal airflow enters the filter bag and flows to the bottom of the filter bag, the cross section area of the inner channel of the filter bag is continuously reduced, so that the filter bag continuously compresses the ash removal airflow, the impact pressure and the impact speed of the ash removal airflow are improved, the ash removal at the bottom of the filter bag is strengthened, and dust particles adhered to the bottom of the filter bag are removed.
In this embodiment, the filter bag is a W-shaped filter bag with a W-shaped axial interface, and the W-shaped filter bag with a large upper portion and a small lower portion compresses the ash removal airflow impacting towards the bottom of the filter bag, so as to enhance the impact of the ash removal airflow on the lower portion of the filter bag and force the dust particles adhered to the lower portion of the filter bag to fall off.
Example 2
A filtering device for a bag bottom reinforced filter bag dust removal method with a variable inner channel comprises a cage framework and a framework pressing sleeve 6, wherein a cloth bag is sleeved outside the cage framework, the cloth bag 1 is attached to the cage framework, the cage framework comprises a cohesive connecting piece 4 and at least 3V-shaped steel circles 2, one end of each V-shaped steel circle 2 is fixed to the cohesive connecting piece 4 and encloses to form a conical inwards concave cavity, referring to FIG. 5, one end of each V-shaped steel circle 2 can be welded to the position D of the cohesive connecting piece 4, the other end of each V-shaped steel circle 2 is folded in the framework pressing sleeve 6, referring to FIG. 6, the other end of each V-shaped steel circle 2 can be welded to the position C of the framework pressing sleeve 6, a detachable cloth bag tensioning sliding block 3 is arranged in the conical inwards concave cavity, one end of the cloth bag 1 is sleeved on the framework pressing sleeve 6, the other end of the cloth bag 1 is folded in the cloth bag tensioning sliding block 3, the sliding block 3 tensioned with the cloth bag is embedded into the conical inward-concave cavity and is fastened by one end of the V-shaped steel circle 2. The cloth bag 1 and the cage framework are attached to each other, so that the cloth bag 1 is well coated on the cage framework, one of the specific embodiments can be that the cloth bag 1 is related to a cloth sleeve with a large upper part and a small lower part, the inner diameter of the cloth sleeve is similar to the outer diameter of the cage framework, and the lower part of the cloth sleeve is gradually shrunk and gathered in the cloth bag tensioning sliding block 3.
In the present embodiment, it is preferred that,
the total number of the V-shaped steel circles 2 is 2N，NIs a natural number andN >1, for example:Nand =2, 3, 4, 5, 6, … …, one end of the V-shaped steel circle 2 is uniformly distributed and fixed on the cohesive connecting piece 4, the other end of the V-shaped steel circle 2 is uniformly distributed and fixed in the framework pressing sleeve 6, so that a framework of the W-shaped filter bag is formed, the cage framework is also W-shaped, and the cross section of the W-shaped cage framework is generally circular, elliptical or trapezoidal.
The one end turn-ups parcel of sack 1 has last elastic ring 9 and elastic ring 10 down to constitute the embedded groove that is used for embedding bag collector baffle 5 by last elastic ring 9 and elastic ring 10 down, refer to fig. 6, make with high strength resistant warm thread at A, B department and make, make and go up elastic ring 9 and elastic ring 10 down by the parcel fixed or connect, fix bag collector baffle 5 between last elastic ring 9 and elastic ring 10 down, go up the thickness 2 ~ 3mm that elastic ring 9 and elastic ring 10 interval are greater than bag collector baffle 5 down.
The framework pressing sleeve 6 is provided with a flange, the upper elastic ring 9 is positioned below the flange, and the upper elastic ring 9 can be covered under the flange as shown in figure 1 or figure 6.
The other end of the cloth bag 1 is tied on the cloth bag tensioning sliding block 3 through a temperature-resistant rope 11, a circular groove is formed in the cloth bag tensioning sliding block 3, and the temperature-resistant rope 11 is embedded into the circular groove.
The cloth bag tensioning sliding block 3 is provided with a bolt 12, the inner gathering connecting piece 4 is provided with a through hole, the bolt 12 penetrates through the through hole and then is in threaded connection with a nut 7, the nut 7 is rotated to adjust the clamping force of one end of the V-shaped steel circle 2 on the cloth bag tensioning sliding block 3 and the cloth bag, referring to fig. 5, the nut 7 is provided with a reverse-tooth nut 8, and the nut 7 is tightly combined with the reverse-tooth nut 8.
The assembly of the filter bag of the invention is as follows: (1) sewing an upper elastic ring and a lower elastic ring in the upper port of the filter bag by using a temperature-resistant rope, wherein the distance between the upper elastic ring and the lower elastic ring is larger than the thickness of a partition plate of the bag type dust collector; (2) the bottom of the filter bag is tied on a cloth bag tensioning slide block through a temperature-resistant rope, and the temperature-resistant rope is embedded into a tensioning slide block circular groove; (3) sleeving the filter bag on a filter bag cage bone consisting of V-shaped round steel; (4) the upper end of a cloth bag tensioning sliding block tied with a filter bag penetrates through the cohesive connecting piece through a bolt, and the bottom of the filter bag is connected to the cohesive connecting piece through the cloth bag tensioning sliding block through a nut; (5) after the upper end port of the filter bag sewed with the upper elastic ring and the lower elastic ring is deformed, the upper end port is clamped in a corresponding hole on a partition plate of the bag type dust collector; (6) downwards exerting force on a framework gland at the upper end of a filter bag cage bone to enable an upper elastic ring to be pressed in the framework gland, and enabling the framework gland to be attached to a partition plate of the bag type dust collector; (7) and a nut connected with a bolt at the upper end of the cloth bag tensioning sliding block penetrating through the cohesive connecting piece is screwed through the upper port of the filter bag, namely, the filter bag is tensioned, and a reverse-tooth nut is arranged on the bolt at the upper end of the cloth bag tensioning sliding block to prevent the nut from loosening when the filter bag works.
The invention can improve the trapping area of unit volume, thereby reducing the manufacturing, installation and civil cost of the whole bag type dust collector, simultaneously strengthening the dust cleaning effect and the dust cleaning uniformity of the filter bag, and being particularly suitable for trapping dust which is easy to absorb moisture and removing dust of high-humidity flue gas.
The invention has been described in detail, but the invention is only a preferred embodiment, not to be considered as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the invention shall fall within the scope of the patent coverage of the invention.
Claims (4)
1. A filtering device is characterized by comprising a cage framework and a framework pressing sleeve (6), wherein a cloth bag is sleeved outside the cage framework, the cloth bag (1) is attached to the cage framework, the cage framework comprises a cohesive connecting piece (4) and at least 3V-shaped steel circles (2), one end of each V-shaped steel circle (2) is fixed to the cohesive connecting piece (4) and encloses to form a conical inwards-concave cavity, the other end of each V-shaped steel circle (2) is collected in the framework pressing sleeve (6), a detachable cloth bag tensioning sliding block (3) is arranged in the conical inwards-concave cavity, one end of the cloth bag (1) is sleeved on the framework pressing sleeve (6), and the other end of the cloth bag (1) is collected in the cloth bag tensioning sliding block (3) and is embedded into the conical inwards-concave cavity along with the cloth bag tensioning sliding block (3) and is fastened by one end of the V-shaped steel circle (2); the total number of the V-shaped steel garden (2) is 2N, N is a natural number and N is more than 1, one end of the V-shaped steel garden (2) is uniformly distributed and fixed on the cohesive connecting piece (4), the other end of the V-shaped steel garden (2) is uniformly distributed and fixed in the framework pressing sleeve (6), a framework of a W-shaped filter bag is formed, a bolt (12) is arranged on the cloth bag tensioning sliding block (3), a through hole is formed in the cohesive connecting piece (4), the bolt (12) penetrates through the through hole and then is in threaded connection with the nut (7), and the nut (7) is rotated to adjust the clamping force of one end of the V-shaped steel garden (2) on the cloth bag tensioning sliding block (3) and the cloth bag.
2. The filtering device according to claim 1, characterized in that one end of the cloth bag (1) is wrapped by an upper elastic ring (9) and a lower elastic ring (10), and the upper elastic ring (9) and the lower elastic ring (10) form an embedded groove for embedding the bag-type dust collector partition plate (5).
3. A filter device according to claim 2, characterised in that a flange is provided on the carcass sleeve (6), the upper elastic ring (9) being located below the flange.
4. The filtering device according to claim 1, characterized in that the other end of the cloth bag (1) is tied to the cloth bag tensioning slider (3) through a temperature resistant rope (11), a groove is arranged on the cloth bag tensioning slider (3), and the temperature resistant rope (11) is embedded in the groove.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263946.2A CN111544973B (en) | 2020-04-07 | 2020-04-07 | Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device |
| PCT/CN2021/076391 WO2021203836A1 (en) | 2020-04-07 | 2021-02-09 | Bottom-reinforced filter bag ash removal method having variable inner channel and filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263946.2A CN111544973B (en) | 2020-04-07 | 2020-04-07 | Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111544973A CN111544973A (en) | 2020-08-18 |
| CN111544973B true CN111544973B (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010263946.2A Active CN111544973B (en) | 2020-04-07 | 2020-04-07 | Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device |
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| Country | Link |
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| CN (1) | CN111544973B (en) |
| WO (1) | WO2021203836A1 (en) |
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|---|---|---|---|---|
| CN111544973B (en) * | 2020-04-07 | 2021-10-29 | 东南大学 | Bag bottom reinforced filter bag dust removal method with variable inner channel and filter device |
| SE544959C2 (en) * | 2021-06-17 | 2023-02-07 | Sila Ab | Filter assembly comprising a bag for filtration of particles in gas flow |
| CN113680148B (en) * | 2021-10-26 | 2022-06-14 | 常州天马粉体科技有限公司 | Dust removal conveying mechanism for workpiece shell |
| CN115161890B (en) * | 2022-06-24 | 2023-12-19 | 山东钢铁股份有限公司 | U-shaped cloth bag processing device for dust remover |
| CN115944988B (en) * | 2023-02-02 | 2024-03-22 | 安徽天成新材料有限公司 | Dust and waste gas treatment system for acetoacetanilide |
| CN116850714B (en) * | 2023-09-05 | 2023-11-14 | 山东中科医药科技有限公司 | Moisture-proof caking multilayer filtering type cloth bag dust remover |
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| CN206454391U (en) * | 2017-01-19 | 2017-09-01 | 江苏平陵机械有限公司 | A kind of big dedusting filtering bag of filter area |
| CN208032118U (en) * | 2018-02-10 | 2018-11-02 | 浙江天台浩凯滤业有限公司 | A kind of antistatic PO PE NT PTFE |
| CN209475823U (en) * | 2018-12-13 | 2019-10-11 | 江苏至臻环保设备有限公司 | A kind of filter bag cage bone mounting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021203836A1 (en) | 2021-10-14 |
| CN111544973A (en) | 2020-08-18 |
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