CN113909113B - Method and system for accurately removing dust - Google Patents
Method and system for accurately removing dust Download PDFInfo
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- CN113909113B CN113909113B CN202010651369.4A CN202010651369A CN113909113B CN 113909113 B CN113909113 B CN 113909113B CN 202010651369 A CN202010651369 A CN 202010651369A CN 113909113 B CN113909113 B CN 113909113B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/06—Feeding or discharging arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
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Abstract
A dust accurate removal method and a system thereof, the method comprises the following steps: 1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ](ii) a 2) Screening the dust-material mixture to obtain a particle size range [ r ] with particle size smaller than the fluidized particle size 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size range r 2 ,r 3 ]The fast screening dust material; 3) And introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing wind upwards in the vertical direction, and the fluidizing wind removes the dust to be removed from the dust material to be fluidized. The technical scheme of this application can be favorable to the accurate of high-pressure gas to getting rid of the active carbon dust in the active carbon material for the particle size of the active carbon dust of getting rid of is adjustable, improves the precision that active carbon dust got rid of.
Description
Technical Field
The invention relates to a dust removal method, in particular to an accurate dust removal method, belonging to the technical field of sintering and regenerating activated carbon; the invention also relates to a dust accurate removal system.
Background
The activated carbon flue gas purification technology has the advantage of multi-pollutant synergistic high-efficiency purification, and is suitable for complex sintering flue gas components (SO) 2 、NO x Dust, O 2 Water vapor, heavy metal) and large temperature fluctuation (110-180 ℃), has been successfully applied to a sintering flue gas purification system, and is also popularized to various industries such as coking, electric power and the likeThe method has a very good multi-pollutant removal effect, and has a very large popularization space under the extremely strict condition of the current environment-friendly situation.
The active carbon flue gas purification process comprises three major devices of an adsorption tower, a regeneration tower and a conveyor, wherein the effective height of a tower body of the adsorption tower is about 30m, the active carbon is used as an adsorbent and a catalyst to perform high-efficiency adsorption on pollutants in the adsorption tower, the active carbon adsorbed with the pollutants moves from top to bottom and is sent to the regeneration tower through a conveying system to be heated and regenerated, the active carbon inevitably generates damage due to self-friction and analytic abrasion in the moving process, the initial columnar active carbon with complete shape is changed into a fine active carbon mixture with different particle sizes, the active carbon is heated and regenerated in the analytic tower and then screened by a vibrating screen to remove a part with smaller particle size, but inevitably still fine particle size active carbon can enter the adsorption system, and meanwhile, due to the electrostatic effect, the surface of the large particle active carbon can be covered with ultrafine carbon powder and can also enter the adsorption system.
The superfine carbon powder in the adsorption tower can affect the system safety, increase the operation cost and possibly improve the dust content at the outlet, so the control of the carbon powder content in the adsorption tower becomes the key for the operation of the flue gas purification system by the activated carbon method and the stable and high-efficiency realization of the ultra-low dust emission. Because the active carbon of first dress belongs to the columnar structure, can produce granular active carbon not of uniform size after mechanical wear or self-friction, the dust of the adhesion of equidimension granular active carbon surface and get rid of the required pressure difference of surface dust, it can't accurately get rid of the dust that adheres to on the active carbon granule surface to rely on simple processing alone.
Therefore, a technical problem to be solved by those skilled in the art is to provide an accurate dust removal method, which is beneficial to removing the activated carbon dust in the activated carbon material by the high-pressure gas, so that the particle size of the removed activated carbon dust can be adjusted, and the accuracy of removing the activated carbon dust can be improved.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention is directed to a method for producing activated carbon dust containing a large amount of target activated carbon powderThe to-be-fluidized dust material is screened out, which is beneficial to removing the activated carbon dust in the activated carbon material by high-pressure gas, so that the particle size of the removed activated carbon dust is adjustable, and the removal precision of the activated carbon dust is improved. The invention provides a dust accurate removal method, which comprises the following steps: 1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ](ii) a 2) Screening the dust-material mixture to obtain a particle size range [ r ] with particle size smaller than the fluidized particle size 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size range r 2 ,r 3 ]The fast screening dust material; 3) And introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing wind upwards in the vertical direction, and the fluidizing wind removes the dust to be removed from the dust material to be fluidized.
According to a first embodiment of the present invention, there is provided a method for the precise removal of dust:
a dust accurate removal method comprises the following steps: 1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ](ii) a 2) Screening the dust-material mixture to obtain a particle size range [ r ] with particle size smaller than the fluidized particle size 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size interval [ r 2 ,r 3 ]The fast screening dust material; 3) And introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing air upwards in the vertical direction, and the fluidizing air removes the dust to be removed from the dust material to be fluidized.
Preferably, the method further comprises the steps of:
4) Grouping the quick screening dust materials according to a certain particle size interval to obtain A3, A4, \ 8230 \ 8230; (n-2) groups of the quick screening dust materials, wherein the particle sizes of the dust materials between the A3, A4, \ 8230; \8230; (n-2) groups are gradually increased, and high-pressure gas is respectively introduced into the A3, A4, \ 8230; (n-8230;) groups to remove dust attached to large particulate matters through blowing, and the A3, A4, \ 8230; (n-8230;) and An groups are respectively subjected to dust removal by blowing, wherein the A3, the A4, \\\ 8230; (n-8230;, and An groups are obtainedThe wind speeds of the high-pressure gas introduced into the group are respectively marked as u 3 、u 4 、……、un。
Preferably, the wind speed of the high-pressure gas introduced into the groups A3, A4, \8230 \ An and An satisfies the following relationship: u. of 3 ＞u 4 ＞……＞un。
Preferably, the step 2) specifically comprises the following steps:
2a) Screening the dust material mixture, and performing step 2b 1) or step 2b 2);
2b1) In the screening treatment process, screening out the direct-discharge dust, and then screening out the dust material to be fluidized to obtain the fast-screening dust material; or
2b2) In the screening treatment process, the fast screening dust materials are screened out, and then the dust materials to be fluidized are screened out, so that the direct-discharge dust is obtained.
Preferably, in the step 4), the fast screening materials are grouped according to a certain particle size interval through the multi-stage screening device.
Preferably, the speed of the fluidized wind in step 3) is u 2 And u is and u 2 Satisfying the following critical formula of fluidization velocity (1)
Wherein d is the diameter of the activated carbon dust to be treated, u is the speed of the fluidized wind, rho is the density of the fluidized wind, mu is the viscosity of the fluidized wind, rho p The density of the activated carbon dust to be treated is shown;
that is to say that the first and second electrodes,
wherein r is 2 Is the minimum particle diameter in the fluidized particle size interval.
Preferably, the particle size interval of the fast screening materials in the group A3 in the step 4) is [ r ] 3 ,r 4 ](ii) a And the wind speed u of the high-pressure gas introduced into the A3 3 The formula (1) of the fluidization velocity is obtained:
wherein r is 3 Is the A3 group particle size interval [ r 3 ,r 4 ]Minimum particle diameter of r 4 Is the A3 group particle size interval [ r 3 ,r 4 ]The maximum particle diameter of (a).
The particle size interval of the A4 group fast screening dust material is [ r ] 4 ,r 5 ]The fast screening dust material of the An group has a particle size interval of r n ,+∞]；
According to a second embodiment of the present invention, there is provided a dust precision removal system:
a dust precision removal system to which the dust precision removal method according to the first embodiment is applied, the system comprising: the multi-stage screening device is used for screening the dust material mixture, screening the dust material mixture into direct-discharge dust, dust materials to be fluidized and fast screening dust materials, discharging the direct-discharge dust from a direct-discharge opening, discharging the dust materials to be fluidized from a to-be-fluidized opening and discharging the fast screening dust materials from a fast screening opening; the direct discharging device is communicated with the direct discharging port and is used for discharging direct discharged dust outwards; the fluidized air washing chamber is communicated with the to-be-fluidized port and is used for fluidizing and removing dust with specified particle size; and the fast screening air washing chamber is communicated with the fast screening port and is used for removing dust attached to large particles.
Preferably, the multi-stage screening device comprises: the device comprises a screening main body, a screening feed inlet, a screening discharge outlet, a multi-stage screening plate and a gathering conduit; the screening feed inlet is formed in the upper end face of the screening main body; the screening discharge port is formed in the lower end face of the screening main body; the plate surface of one end of the multi-stage screening plate is positioned below the screening feed port, and the edge of the other end of the multi-stage screening plate is positioned on one side above the screening discharge port;
a plurality of groups of interval sieve pores with different apertures are arranged on the multistage sieving plate along the length direction; from the screening feed inlet to the screening discharge outlet, multiple groups of interval sieve pores are sequentially marked asK1, K2, K3, K4, \ 8230; \ 8230;, K (n-1), the aperture of the interval sieve pore of the K1 group is r 2 (ii) a The aperture of the K2 group of interval sieve pores is r 3 (ii) a The aperture of the K4 groups of interval sieve pores is r 5 The interval sieve pore diameter of the group K (n-1) is r n ；
A gathering conduit for gathering the screened substances of the interval sieve pores is arranged below each group of interval sieve pores; the discharge port of the convergence conduit below the group K1 is a straight discharge port; the discharge port of the convergence conduit below the group K2 is a port to be fluidized; k3, \ 8230 \ 8230:, the discharge port of the convergence duct below the group K (n-1) is a fast screen port; and a fast screen opening is also arranged below the screening discharge opening, and (n-2) fast screen openings are provided in total.
Preferably, the number of the fast screen air washing chambers corresponds to the number of the fast screen openings one by one; and/or
The multi-stage screening apparatus further comprises: the device comprises a spring support structure and an excitation driving device; the spring support structure is arranged below the screening main body; the vibration excitation driving device is arranged on the screening main body.
Preferably, the fluidized air washing chamber and the quick screening air washing chamber are both air washing treatment devices; the air washing treatment device comprises: the air washing main cavity, the porous air distribution plate, the air spraying mechanism and the air speed sensor; the upper end of the air washing main cavity is provided with a feeding hole; the porous air distribution plate is horizontally arranged in the air washing main cavity and supports dust materials to be fluidized; the air spraying mechanism is arranged in the air washing main cavity and is positioned below the porous air distribution plate; the wind speed sensor is arranged in the wind washing main cavity, and is positioned above the porous wind distribution plate.
Preferably, the straight discharging device is an air washing treatment device.
In the traditional engineering practice, a great amount of activated carbon dust (activated carbon micro-particles with the particle size less than 1.4 mm) is entrained in the activated carbon material in the desorption tower-adsorption tower, and the activated carbon dust is easy to adsorb and block various parts of the whole activated carbon circulation system, so that faults are caused. Due to static electricity, activated carbon dust is often attached to large activated carbon particles, and the activated carbon dust can hinder the adsorption of the activated carbon particles to sintering flue gas. In addition, the electrostatic effect is different due to different particle sizes of the large particles of the active carbon. Resulting in different degrees of difficulty in removing the activated carbon dust from different activated carbon particles. If all the activated carbon materials are simultaneously removed by the same method, for example, the activated carbon powder is removed by adopting a blowing method, the small-particle activated carbon is filled among the large-particle activated carbon, so that the speed of the air flow reaching the surface of the large particles is reduced, and the air flow is influenced to remove the activated carbon powder on the surface of the large-particle activated carbon; because the large-particle activated carbon has large volume, the blowing of the small-particle activated carbon by the air flow is blocked, so that the removal of activated carbon powder on the surface of the small-particle activated carbon by the air flow is influenced.
In the first embodiment of the present application, the particle size range of the dust to be fluidized, which needs to be removed from the activated carbon material, is first selected according to the actual process requirements, and is labeled as [ r ] 2 ,r 3 ]. Then the dust material mixture (activated carbon material) is divided into three parts by a screening treatment, including: particle size less than fluidized particle size range [ r 2 ,r 3 ]In the fluidized particle size range [ r ] of the directly discharged dust 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size interval [ r 2 ,r 3 ]The fast screening dust material; and then introducing high-pressure gas into the dust material to be fluidized, and controlling the upward fluidizing wind speed in the vertical direction on the dust material to be fluidized, so that the activated carbon dust corresponding to the fluidizing wind speed is discharged from the dust material to be fluidized, and the aim of accurately removing the activated carbon dust is fulfilled. The dust material to be fluidized containing a large amount of target activated carbon dust is screened out, so that the removal of the activated carbon dust in the activated carbon material by high-pressure gas can be facilitated, the particle size of the removed activated carbon dust can be adjusted, and the removal precision of the activated carbon dust is improved.
It should be noted that, in one embodiment of the present application, the dust material mixture is an activated carbon material in an adsorption-desorption column system.
The fluidized air implies the conditions for controlling the air speed of the high-pressure gas, that is, the speed of the fluidized air blown into the activated carbon material is adjusted by controlling the flow rate of the high-pressure gas per unit time, and the fluidized air with a certain speed can float the activated carbon dust with a certain particle size or less, so that the activated carbon dust is separated from the activated carbon material and flies out.
In a first embodiment of the present application, the fast screening material is subjected to the removal of activated carbon powder using a screening process; grouping the fast screening dust materials according to the particle size, such as obtaining fast screening dust materials marked as A3, A4, \8230, 8230, an; then high-pressure gas is introduced into the fast dust screening materials of different groups from the bottom. Because the particle sizes of the fast dust screening materials of different groups are different, and the gaps among the activated carbon particles are different, the penetration resistance of the high-pressure gas in the fast dust screening materials of different groups is different. The smaller the diameter of the particle size of the activated carbon particles, the smaller the gaps between the activated carbon particles, and the greater the resistance to gas penetration; the larger the diameter of the particle diameter of the activated carbon particles, the larger the gaps between the activated carbon particles, and the smaller the resistance to gas passage. Therefore, in a preferred embodiment of the present application, the wind speeds of the groups A3, A4, \8230 \ 8230;, an at which high-pressure gas is introduced are controlled to satisfy the following relationship: u. of 3 ＞u 4 ＞……＞u n . Namely, the method is equivalent to controlling the pressure values of the high-pressure gas in the A3, A4, 8230, 8230and An groups to be gradually reduced, thereby meeting the requirement of fast screening and saving energy consumption.
In the first embodiment of the application, the dust mixture is subjected to screening treatment in step 2), and the dust mixture is divided into direct-discharge dust, dust to be fluidized and fast-screening dust by a multi-stage screening device; the multi-stage screening device has various screening modes for the dust and material mixture, and two examples are given in the application. A first embodiment is, as described in step 2b 1): screening out the directly discharged dust, and then screening out the dust material to be fluidized to obtain the fast dust screening material; and a second embodiment is, as described in step 2b 2): and screening out the fast-screening dust material, and then screening out the dust material to be fluidized to obtain the direct-discharge dust. Through multistage screening plant, will be continuous dirt material mixture separation, greatly do benefit to the later stage to the activated carbon material in, the screening of activated carbon dust.
In the first embodiment of the present application, the multi-stage screening device further screens the fast screening materials at the same time, and screens the fast screening materials into multiple groups, thereby facilitating the subsequent screening of fast screening materials with different particle sizes.
In the first embodiment of the present application, in step 3), high-pressure gas is introduced into the dust material to be fluidized, and the fluidizing air speed u borne by the dust material to be fluidized is ensured 2 The requirement of fluidization speed is met.
It should be noted that the fluidizing velocity refers to a corresponding wind speed when the medium moves upward against its own gravity in a fluidized state, which is called a fluidizing velocity, wherein the wind volume that does not increase the bed resistance in the circulating fluidized bed boiler is the lowest fluidizing wind volume, and the corresponding wind speed is the lowest fluidizing velocity. The fluidized state means that the medium enters the container at a certain speed to provide certain wind pressure at the bottom of the container, the partial pressure of the medium is more than or equal to the weight of the medium on a unit section, the medium moves in a suspension state and cannot be carried away by fluidized wind, and a horizontal interface is required at the upper part of the medium.
Therefore, a certain fluidization wind speed is always kept in the wind washing chamber; when the dust to be fluidized of the small particles enters the air washing chamber, the small particles are immediately subjected to buoyancy given by the fluidizing air speed, so that the small particles are separated from the dust to be fluidized of the large particles. According to the fluidization velocity formula:
when the fluidization air speed is u mf In this case, the activated carbon dust particles having a particle size d will be suspended and blown. And particularly in the embodiment of the present application, the diameter of the activated carbon dust to be fluidized and sieved is set to r 2 And obtaining the following components according to a fluidization wind speed critical formula:
controlling the fluidization air speed to be u 2 Then the size can be set asr, the activated carbon dust particles will be blown up in suspension.
In the first embodiment of the present application, the fast screening material is also fluidized to remove dust; and the minimum particle size in the fast screening dust material is larger than r 3 Therefore, the maximum value of the fluidizing air speed for fluidizing the fast dust screening material is u 3 And is greater than u 2 I.e. group A3, is subjected to a fluidizing air velocity of u 3 (ii) a According to a fluidization wind speed critical formula, the method comprises the following steps:
wherein r is 3 Is the A3 group particle size interval [ r 3 ,r 4 ]Minimum particle diameter of r 4 Is the A3 group particle size interval [ r 3 ,r 4 ]The maximum particle diameter of (a).
The particle size interval of the A4 group fast screening dust material is [ r ] 4 ,r 5 ]The fast screening dust material of the An group has a grain size interval of r n ,+∞]；
In a second embodiment of the present application, a dust removal system is provided that utilizes the method described in the first embodiment. The system firstly sieves a dust material mixture into direct-discharge dust, dust materials to be fluidized and fast-sieving dust materials through a multi-stage sieving device. And the direct-discharge dust is discharged from the direct-discharge port, the dust material to be fluidized is discharged from the port to be fluidized, and the fast-screening dust material is discharged from the fast-screening port. And the directly discharged dust is directly discharged by the directly discharging device. The dust material to be fluidized enters a fluidized air washing chamber for fluidization screening and air separation treatment; and the fast screening dust material enters a fast screening air washing chamber to be subjected to fast screening dust removal treatment. The technical scheme of the application can effectively utilize the multistage screening to promote the effect of fluidization winnowing treatment, thereby improving the effect of removing dust from the activated carbon material.
In a second embodiment of the present application, the multi-stage screening device specifically includes, but is not limited to, the following components: screening main part, screening feed inlet, screening discharge gate, multistage screening board, assemble the pipe. In the prior art, there are a variety of screening arrangements available for use in multi-stage screening devices. But in order to reach the purpose of this application embodiment, be provided with in the screening main part of the screening plant that this application provided, screening feed inlet, screening discharge gate, multistage screening board, assemble the pipe. And discharging materials screened out by different screening areas on the multi-stage screening plate through a gathering conduit, and finally discharging part of the active carbon particles with overlarge particle sizes from a screening discharge hole.
In a second embodiment of the present application, the multi-stage screening device has an example, which adopts a horizontal (slightly inclined) arrangement, the dust material mixture (activated carbon material) enters from the screening feed inlet and then is laid on the multi-stage screening plates, the particle size of the material is changed from small to large in the process of advancing along with the screening plates, and the activated carbon dust and particles pass through the multi-stage screening plates in the corresponding particle size area and fall into the corresponding converging duct.
It is noted that the multi-group interval screen holes on the multi-stage screening plate comprise K1, K2, K3, K4, \ 8230 \ 8230;, K (n-1), and screening discharge holes for discharging activated carbon particles exceeding the interval screen holes of the multi-stage screening plate, wherein the total number of the K1, K2, K3, K4, \ 8230; \8230;, and Kn groups. The aperture of the K1 group of interval sieve pores is r 2 (ii) a The aperture of the K2 group of interval sieve pores is r 3 (ii) a The aperture of the K4 groups of interval sieve pores is r 5 The interval sieve pore diameter of the group K (n-1) is r n 。
In a second embodiment of the present application, to facilitate the screening effect of a multi-stage screening device, a first example is to provide a spring support structure and excitation drive means on the screen body. In a second embodiment, the spring support structure is used to support and suspend the multi-stage screening deck within the screening body; the excitation driving device is arranged on the multistage screening plate.
In a second embodiment of the present application, the fluidized air washing chamber and the fast screen air washing chamber are both air washing treatment devices, and the whole parts are the same. However, there are some differences according to the actual working conditions. Wherein the set value of the fluidization air speed in the fluidization air washing chamber is u 2 And the fluidizing air speed of the fast-screening air washing chamber can not be more than u 3 . To ensure that the appointed active carbon dust can be removed in the fluidized air washing chamber, and only the particle size less than r can be removed in the fast screening air washing chamber 3 The activated carbon dust of (2).
In the second embodiment of the present application, when the inline device is a wind-washing treatment device, the velocity of the fluidizing wind of the inline device is not less than u 2 . To ensure that dust entering the straight discharging device can be completely discharged.
It is important to supplement that the activated carbon flue gas purification process flow is shown in fig. 2, and the gas flow direction is as follows: the flue gas is discharged after being efficiently removed by the adsorption unit, and a two-stage adsorption mode is adopted in general adsorption. The active carbon trend is as follows: the active carbon for adsorbing pollutants is sent to a regeneration tower, the regeneration tower is heated and regenerated, and then is screened by a vibrating screen, and oversize materials return to the adsorption tower, so that a cycle is completed. According to engineering requirements, a long-strip screen with the particle size of 1.4mm or 2mm is generally selected for the existing vibrating screen, namely small-particle activated carbon with the particle size of less than 1.4mm or less than 2.0mm is screened out of a system and returned to the original system when the particle size is larger than the corresponding particle size. As introduced above, the screening effect cannot reach 100%, and due to the electrostatic effect, the surface of the large-particle activated carbon will be covered with the ultrafine carbon powder and will also enter the adsorption system, and the ultrafine dust will have a bad influence on the flue gas purification system: (1) The bed layer is blocked by the small-particle activated carbon and the carbon powder, and the pressure drop is increased; (2) the ignition point of the carbon powder is low, and the system safety is influenced; (3) The superfine carbon powder can be combined with substances such as ammonium sulfate and the like to block a feed opening; (4) The ultrafine carbon powder is likely to be taken out of the system, which affects dust measurement, improves environmental protection pressure and is not beneficial to realizing ultralow emission.
To reduce the dust content entering the flue gas cleaning system, an activated carbon flue gas cleaning process as in figure 3 was developed.
Activated carbon orientation in fig. 3: the active carbon adsorbing the pollutants enters the desorption tower from the adsorption tower, is desorbed and regenerated and is screened by the vibrating screen, the ultrafine carbon particles of the undersize products are used for other purposes, and the large-particle active carbon of the oversize products enters the winnowing device and then returns to the adsorption tower.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the technical scheme provided by the application, the activated carbon dust in the activated carbon material can be removed by high-pressure gas, so that the particle size of the removed activated carbon dust is adjustable, and the removal precision of the activated carbon dust is improved;
2. the application provides a technical scheme, when can satisfying the sieve demand soon, practice thrift the energy consumption.
Drawings
FIG. 1 is a schematic flow chart of a method for accurately removing dust in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art activated carbon flue gas purification process;
FIG. 3 is a schematic structural diagram of a novel activated carbon flue gas purification process according to an embodiment of the present invention;
FIG. 4 is a pneumatic separation flow chart of a dust precise removal method in an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a dust precise removal system in an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an air washing treatment apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of upper and lower sieving air separation of the dust precise removal system in the embodiment of the invention.
Reference numerals:
1: a multi-stage screening device; 101: a straight discharge port; 102: a port to be fluidized; 103: a fast screen port; 104: screening the main body; 105: screening a feed inlet; 106: screening a discharge hole; 107: a multi-stage screening plate; 108: a converging conduit; 109: a spring support structure; 110: an excitation driving device; 2: a straight row device; 3: a fluidized air washing chamber; 4: a quick-screening air washing chamber; a1: washing the main cavity by wind; a2: a porous air distribution plate; a3: a wind spraying mechanism; a4: and a wind speed sensor.
Detailed Description
According to a first embodiment of the present invention, there is provided a method for the accurate removal of dust:
a method for accurately removing dust, comprising the steps of:
1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ]；
2) Screening the dust-material mixture to obtain a stream having a particle size smaller than that of the dust-material mixtureGrain size range [ r 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size interval [ r 2 ,r 3 ]The fast screening dust material;
3) And introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing air upwards in the vertical direction, and the fluidizing air removes the dust to be removed from the dust material to be fluidized.
Preferably, the method further comprises the steps of:
4) Grouping the fast screening dust materials according to a certain particle size interval to obtain A3, A4, \8230:, an, and (n-2) groups of the fast screening dust materials, wherein the particle sizes of the dust materials between the A3, A4, \8230:, and the a groups are gradually increased, high-pressure gas is respectively introduced into the A3, A4, \8230:, and the An groups to blow and remove dust attached to large particles, the wind speeds of the A3, A4, \8230:, and the a groups introduced with high-pressure gas are respectively marked as u 3 、u 4 、……、u n 。
Preferably, the wind speed of the high-pressure gas introduced into the groups A3, A4, \8230 \ An and An satisfies the following relationship: u. u 3 ＞u 4 ＞……＞u n 。
Preferably, the step 2) specifically comprises the following steps:
2a) Screening the dust material mixture, and performing step 2b 1) or step 2b 2);
2b1) In the screening treatment process, screening out the direct-discharge dust, and then screening out the dust material to be fluidized to obtain the fast-screening dust material; or
2b2) In the screening treatment process, the fast screening dust material is screened out, and then the dust material to be fluidized is screened out, so that the direct-discharge dust is obtained.
Preferably, in the step 4), the fast screening materials are grouped according to a certain particle size interval by the multistage screening device 1.
Preferably, the speed of the fluidized wind in step 3) is u 2 And u is 2 Satisfying the following critical formula of fluidization velocity (1)
Wherein d is the diameter of the activated carbon dust to be treated, u is the speed of the fluidized wind, rho is the density of the fluidized wind, mu is the viscosity of the fluidized wind, rho p The density of the activated carbon dust to be treated is obtained;
that is to say that the temperature of the molten steel,
wherein r is 2 Is the minimum particle diameter in the fluidized particle size interval.
Preferably, the particle size interval of the fast screening materials in the group A3 in the step 4) is [ r ] 3 ,r 4 ](ii) a And the wind speed u of the high-pressure gas introduced into the A3 3 According to the fluidization velocity formula (1):
wherein r is 3 Is the A3 group particle size interval [ r 3 ,r 4 ]Minimum particle diameter of r 4 Is the A3 group particle size interval [ r 3 ,r 4 ]The maximum particle diameter of (a).
According to a second embodiment of the present invention, there is provided a dust accurate removal system:
a dust precision removal system to which the dust precision removal method according to the first embodiment is applied, the system comprising: the multi-stage screening device 1 is used for screening dust material mixtures, the multi-stage screening device 1 is used for screening the dust material mixtures into straight dust, dust materials to be fluidized and fast dust materials, the straight dust is discharged from a straight discharge port 101, the dust materials to be fluidized are discharged from a dust material to be fluidized port 102, and the fast dust materials are discharged from a fast screening port 103; a direct discharging device 2 communicated with the straight discharging port 101 and used for discharging direct discharged dust outwards; a fluidized air washing chamber 3 which is communicated with the to-be-fluidized opening 102 and is used for fluidizing and removing dust with specified particle size; and the fast screening air washing chamber 4 is communicated with the fast screening port 103 and is used for removing dust attached to large particles.
Preferably, the multi-stage screening device 1 comprises: the screening device comprises a screening main body 104, a screening feed inlet 105, a screening discharge outlet 106, a multi-stage screening plate 107 and a convergence duct 108;
the screen feed inlet 105 is arranged on the upper end surface of the screen main body 104; the screening discharge outlet 106 is arranged on the lower end face of the screening main body 104; the plate surface of one end of the multi-stage screening plate 107 is positioned below the screening feed inlet 105, and the edge of the other end of the multi-stage screening plate 107 is positioned on one side above the screening discharge outlet 106;
a plurality of groups of interval sieve pores with different pore diameters are arranged on the multistage sieving plate 107 along the length direction; in the direction from the screening feed inlet 105 to the screening discharge outlet 106, a plurality of groups of interval sieve holes are marked as K1, K2, K3, K4, \8230;, K (n-1) in sequence, and the aperture of the K1 group of interval sieve holes is r 2 (ii) a The aperture of the K2 group of interval sieve pores is r 3 (ii) a The aperture of the K4 groups of interval sieve pores is r 5 The interval sieve pore diameter of the group K (n-1) is r n ；
A gathering conduit 108 for gathering the screened-out materials of the interval sieve pores is arranged below each group of interval sieve pores; the discharge port of the convergence duct 108 below the group K1 is a straight discharge port 101; the discharge opening of the convergence duct 108 below the group K2 is the opening 102 to be fluidized; k3, \ 8230; \ 8230;, the discharge opening of the converging duct 108 below the group K (n-1) is a fast screen opening 103; the lower part of the screening discharge hole 106 is also provided with a fast screen hole 103, and the total number of the fast screen holes 103 is (n-2).
Preferably, the number of the fast screen air washing chambers 4 corresponds to the number of the fast screen openings 103 one by one; and/or
The multistage screening device 1 further comprises: a spring support structure 109, an excitation drive device 110; the spring support structure 109 is disposed below the screen body 104; the excitation drive 110 may be disposed on the screen body 104.
Preferably, the fluidized air washing chamber 3 and the fast screening air washing chamber 4 are both air washing treatment devices; the air washing treatment device comprises: the device comprises a wind washing main cavity A1, a porous wind distribution plate A2, a wind spraying mechanism A3 and a wind speed sensor A4; the upper end of the air washing main cavity A1 is provided with a feeding hole; the porous air distribution plate A2 is horizontally arranged in the air washing main cavity A1, and the porous air distribution plate A2 supports dust materials to be fluidized; the air spraying mechanism A3 is arranged in the air washing main cavity A1, and the air spraying mechanism A3 is positioned below the porous air distribution plate A2; the wind speed sensor A4 is arranged in the wind washing main cavity A1, and the wind speed sensor A4 is positioned above the porous wind distribution plate A2.
Preferably, the direct discharging device 2 is a wind washing treatment device.
Example 1
A dust accurate removal method comprises the following steps:
1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ]；
2) Screening the dust-material mixture to obtain a particle size range [ r ] with particle size smaller than the fluidized particle size 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r ] 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size interval [ r 2 ,r 3 ]The fast screening dust material;
3) And introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing wind upwards in the vertical direction, and the fluidizing wind removes the dust to be removed from the dust material to be fluidized.
Example 2
Example 1 was repeated except that the process further included the following steps:
4) Grouping the quick screening dust materials according to a certain particle size interval to obtain A3, A4, \ 8230 \ 8230; (n-2) groups of the quick screening dust materials, wherein the particle sizes of the dust materials between the A3, A4, \ 8230; \8230;, and the An groups are gradually increased, high-pressure gas is respectively introduced into the A3, A4, \ 8230;, \ 8230;, and the An groups, and is blown to remove dust attached to large particulate matters, the wind speeds of the A3, A4, \ 8230;, and the a groups are respectively marked as u 3 、u 4 、……、u n . The wind speed of high-pressure gas introduced into the A3, A4, 8230A and An groups satisfies the following relation：u 3 ＞u 4 ＞……＞u n 。
Example 3
Example 2 is repeated except that step 2) specifically comprises the following steps:
2a) Screening the dust material mixture, and performing step 2b 1) or step 2b 2);
2b1) In the screening treatment process, screening out the direct-discharge dust, and then screening out the dust material to be fluidized to obtain the fast-screening dust material; or
2b2) In the screening treatment process, the fast screening dust materials are screened out, and then the dust materials to be fluidized are screened out, so that the direct-discharge dust is obtained.
Example 4
Example 3 is repeated except that in step 4) the fast screening materials are grouped according to a certain particle size interval by the multi-stage screening device 1.
Example 5
Example 4 was repeated except that in step 3) the velocity of the fluidized wind was u 2 And u is and u 2 Satisfying the following critical formula of fluidization velocity (1)
Wherein d is the diameter of the activated carbon dust to be treated, u is the speed of the fluidized wind, rho is the density of the fluidized wind, mu is the viscosity of the fluidized wind, rho p The density of the activated carbon dust to be treated is shown;
that is to say that the first and second electrodes,
wherein r is 2 Is the minimum particle diameter in the fluidized particle size interval.
Example 6
Example 5 was repeated except that the fast sieving material of group A3 in step 4) had a particle size interval of [ r ] 3 ,r 4 ](ii) a And the wind speed u of the high-pressure gas introduced into the A3 3 The formula (1) of the fluidization velocity is obtained:
wherein r is 3 Is the particle size interval [ r ] of the group A3 3 ,r 4 ]Minimum particle diameter of r 4 Is the particle size interval [ r ] of the group A3 3 ,r 4 ]The maximum particle diameter of (a).
Example 7
A dust precision removal system, the system comprising: the multi-stage screening device 1 is used for screening dust material mixtures, the multi-stage screening device 1 is used for screening the dust material mixtures into straight dust, dust materials to be fluidized and fast dust materials, the straight dust is discharged from a straight discharge port 101, the dust materials to be fluidized are discharged from a dust material to be fluidized port 102, and the fast dust materials are discharged from a fast screening port 103; a direct discharging device 2 communicated with the straight discharging port 101 and used for discharging direct discharged dust outwards; a fluidized air washing chamber 3 which is communicated with the port 102 to be fluidized and is used for fluidizing and removing dust with specified particle size; and the fast screening air washing chamber 4 is communicated with the fast screening opening 103 and is used for removing dust attached to large particles.
Example 8
Example 7 was repeated except that the multi-stage screening device 1 comprises: the screening device comprises a screening main body 104, a screening feed inlet 105, a screening discharge outlet 106, a multi-stage screening plate 107 and a convergence duct 108;
the screen feed inlet 105 is arranged on the upper end surface of the screen main body 104; the screening discharge outlet 106 is arranged on the lower end face of the screening main body 104; the plate surface of one end of the multi-stage screening plate 107 is positioned below the screening feed inlet 105, and the edge of the other end of the multi-stage screening plate 107 is positioned on one side above the screening discharge outlet 106;
a plurality of groups of interval sieve pores with different pore diameters are arranged on the multistage sieving plate 107 along the length direction; in the direction from the screening feed inlet 105 to the screening discharge outlet 106, a plurality of groups of interval sieve holes are marked as K1, K2, K3, K4, \8230;, K) n-1 in sequence, and the aperture of the K1 group of interval sieve holes is r 2 (ii) a The aperture of the K2 groups of interval sieve pores is r 3 (ii) a K4 groups of the interval sieve poresHas a pore diameter of r 5 The section sieve pore diameter of group K (n-1) is r n ；
A gathering conduit 108 for gathering the screened-out materials of the interval sieve pores is arranged below each group of interval sieve pores; the discharge port of the convergence duct 108 below the group K1 is a straight discharge port 101; the discharge opening of the convergence duct 108 below the group K2 is the opening 102 to be fluidized; k3, \ 8230; \ 8230;, the discharge opening of the converging duct 108 below the group K (n-1) is a fast screen opening 103; the lower part of the screening discharge hole 106 is also provided with a fast screen hole 103, and the total number of the fast screen holes 103 is (n-2).
Example 9
Example 8 is repeated except that the number of the fast screen air washing chambers 4 corresponds to the number of the fast screen openings 103 one by one.
Example 10
Example 9 was repeated except that the multi-stage screening apparatus 1 further comprises: a spring support structure 109, an excitation drive device 110; the spring support structure 109 is disposed below the screen body 104; the excitation drive 110 may be disposed on the screen body 104.
Example 11
Example 10 was repeated except that the fluidized air washing chamber 3 and the fast-screening air washing chamber 4 were both air washing treatment devices; the air washing treatment device comprises: the air washing device comprises an air washing main cavity A1, a porous air distribution plate A2, an air spraying mechanism A3 and an air speed sensor A4; the upper end of the air washing main cavity A1 is provided with a feeding hole; the porous air distribution plate A2 is horizontally arranged in the air washing main cavity A1, and the porous air distribution plate A2 supports dust materials to be fluidized; the air spraying mechanism A3 is arranged in the air washing main cavity A1, and the air spraying mechanism A3 is positioned below the porous air distribution plate A2; the wind speed sensor A4 is arranged in the wind washing main cavity A1, and the wind speed sensor A4 is positioned above the porous wind distribution plate A2.
Example 12
Example 11 was repeated except that the inline device 2 was a wind-wash treatment device.
Working example 1
The dust accurate removal system adopts the structure shown in figure 4, and the blanking active carbon of the desorption tower is screened into d 1 、d 2 、....、d 6 The different particle sizes are arranged from large to small or from small to large, and can be divided into more than 10mm, 8-10mm, 5-8mm, 3-5mm, 1.4-3mm, less than 1.4mm and the like. In general, the particle size ratios of activated carbon after vibratory screening are as follows:
| serial number | ≥10mm | 8-10 | 5-8 | 3-5 | 1.4-3 | ＜1.4 |
| Vibrating screen blanking | 2.81％ | 60.38％ | 28.58％ | 7.68％ | 0.58 | 0.033％ |
As a result, it was found that the particle size of activated carbon was mainly concentrated between 5 and 10mm, 3 to 5mm was 7%, more than 10mm was 3%, and less than 1.4mm, while the ultrafine dust was mainly concentrated in the particle size range of less than 1.4 mm.
According to the following particle size distribution, assuming that the particle size distribution gradually becomes smaller from left to right, high-pressure air is adopted for purging in the d1 particle size range, the air volume is smaller, the d2/d3 particle size air volume is larger, d4 is the largest, the air volume in d5 is selected according to the fluidization speed principle, and d6 is completely carried away by air. Briefly described by the device shown in figure 4, the activated carbon after high-temperature analysis enters a vibrating screen, the box body of the vibrating screen is supported by two spring upright posts and is excited by an excitation device, in order to achieve better layering screening effect of particles with different particle sizes, the vibration frequency is controlled to be 5-15Hz, and the vibration amplitudes in the x direction and the y direction are controlled to be 3-8mm. The screen bars in the vibrating box are divided into 5 sections along the length direction, and the screen holes are respectively 1.4mm, 3mm, 5mm, 8mm and 10mm. The particle diameters of the active carbon screened out by the sieve pores are respectively below 1.4mm, 1.4-3mm, 3-5mm, 5-8mm, 8-10mm and above 10mm. And the screened active carbon respectively enters each air washing chamber through a discharging pipe and a distributing plate. The lower part of the wind washing chamber is provided with a wind chamber, and the wind distributor uniformly enters the wind washing chamber through a porous wind distribution plate. Because the active carbon granule in each wind washing room all is through the screening respectively, it is comparatively even, therefore the air current is also comparatively even respectively. In addition, according to different particle size distribution intervals of the activated carbon, the air volume blowing of the corresponding strategy can be adopted, and the better cleaning efficiency is achieved. Blowing the air of the ultrafine dust, passing through an outlet sieve plate, and discharging after dust removal treatment.
The front 4 air washing chambers are used for blowing the fine dust attached to large particles, so that the air can be quantitatively blown from small to large according to the given air pressure; the air washing chambers 5 and 6 are controlled by a control method of the fluidization air speed in order to suck all 1.4mm particles.
Working example 2
The accurate desorption system of dust adopts the structure shown in figure 7, arranges the active carbon of different particle sizes from top to bottom, and the amount of wind sweeps from top to bottom, and different particle sizes active carbon from the top down arranges in figure 7, and large granule active carbon is last, and the small granule active carbon is down, and different particle size ranges all are provided with into the wind gap, and the air-out can carry out reuse from the top down.
Claims (10)
1. A dust accurate removal method is characterized by comprising the following steps:
1) Selecting the fluidized particle size range [ r ] of the dust material mixture to be fluidized and winnowed 2 ,r 3 ]；
2) Screening the dust-material mixture to obtain a particle size range [ r ] with particle size smaller than the fluidized particle size 2 ,r 3 ]The directly discharged dust belongs to a fluidized particle size interval [ r 2 ,r 3 ]The particle size of the dust to be fluidized in the range is larger than the fluidized particle size interval [ r 2 ,r 3 ]The fast screening dust material;
3) Introducing high-pressure gas into the dust material to be fluidized, so that the dust material to be fluidized is blown by fluidizing air upwards in the vertical direction, and the fluidizing air removes dust to be removed from the dust material to be fluidized; the wind speed of the fluidized wind is u 2 And u is and u 2 Satisfying the following fluidization velocity critical formula (1):
wherein d is the diameter of the activated carbon dust to be treated, rho is the density of the fluidized wind, mu is the viscosity of the fluidized wind, rho p The density of the activated carbon dust to be treated is shown, and g is gravity acceleration;
that is to say that the temperature of the molten steel,
wherein r is 2 Is the minimum particle diameter in the fluidized particle size interval.
2. The method for accurately removing dust according to claim 1, which further comprises the steps of:
4) Grouping the fast screening dust materials according to a certain particle size interval to obtain A3, A4, \8230:, an, and (n-2) groups of the fast screening dust materials, wherein the particle sizes of the dust materials between the A3, A4, \8230:, and the An groups are gradually increased, and high-pressure gas is respectively introduced into the A3, A4, \8230:, and the An groups to remove dust attached to large particles by blowing, and the A3, A4, \8230:, 8230:, and the An groups are introduced with high pressure gasThe wind velocities of the gases are marked u respectively 3 、u 4 、……、u n 。
3. The method for accurately removing the dust according to claim 2, wherein the wind speeds of high-pressure gases introduced into groups A3, A4, \8230;, an satisfy the following relationship: u. of 3 ＞u 4 ＞……＞u n 。
4. The method for accurately removing the dust according to claim 3, wherein the step 2) specifically comprises the following steps:
2a) Screening the dust material mixture, and performing step 2b 1) or step 2b 2);
2b1) In the screening treatment process, screening out the directly discharged dust, and then screening out the dust material to be fluidized to obtain the fast screening dust material; or
2b2) In the screening treatment process, the fast screening dust material is screened out, and then the dust material to be fluidized is screened out, so that the direct-discharge dust is obtained.
5. The method for accurately removing the dust according to claim 4, wherein the fast screening materials are grouped according to a certain particle size interval by a multi-stage screening device (1) in the step 4).
6. The method for accurately removing dust in any one of claims 2 to 5, wherein the fast screening material of the group A3 in the step 4) has a particle size interval of [ r [ r ] ] 3 ,r 4 ](ii) a And the wind speed u of the high-pressure gas introduced into the A3 3 The critical formula (1) of the fluidization velocity is obtained:
wherein r is 3 Is the particle size interval [ r ] of the group A3 3 ,r 4 ]Minimum particle diameter of r 4 Is the A3 group particle size interval [ r 3 ,r 4 ]The maximum particle diameter of (a).
7. A dust precision removal system to which the dust precision removal method according to any one of claims 1 to 6 is applied, comprising: the multi-stage screening device (1) is used for screening dust material mixtures, the multi-stage screening device (1) screens the dust material mixtures into straight dust, dust materials to be fluidized and fast screening dust materials, the straight dust materials are discharged from a straight discharging opening (101), the dust materials to be fluidized are discharged from a dust material to be fluidized, and the fast screening dust materials are discharged from a fast screening opening (103);
the straight discharging device (2) is communicated with the straight discharging port (101) and is used for discharging straight discharged dust outwards;
the fluidized air washing chamber (3) is communicated with the to-be-fluidized opening (102) and is used for fluidizing and removing dust with specified particle size;
the fast screen air washing chamber (4) is communicated with the fast screen port (103) and is used for removing dust attached to large particles;
the multi-stage screening device (1) comprises: the device comprises a screening main body (104), a screening feed inlet (105), a screening discharge outlet (106), a multi-stage screening plate (107) and a convergence conduit (108);
the screening feed inlet (105) is arranged on the upper end face of the screening main body (104); the screening discharge hole (106) is formed in the lower end face of the screening main body (104); the plate surface of one end of the multi-stage screening plate (107) is positioned below the screening feed inlet (105), and the edge of the other end of the multi-stage screening plate (107) is positioned on one side above the screening discharge outlet (106);
a plurality of groups of interval sieve pores with different apertures are arranged on the multi-stage sieving plate (107) along the length direction; multiple groups of interval sieve holes are marked as K1, K2, K3, K4, \8230, 8230, K (n-1) in sequence from the screening feed port (105) to the screening discharge port (106), and the aperture of the interval sieve holes in the K1 group is r 2 (ii) a The aperture of the K2 groups of interval sieve pores is r 3 (ii) a The aperture of the K4 groups of interval sieve pores is r 5 The section sieve pore diameter of group K (n-1) is r n ；
A gathering conduit (108) for gathering the screened substances of the interval sieve holes is arranged below each group of interval sieve holes; the discharge port of the convergence duct (108) below the group K1 is a straight discharge port (101); the discharge opening of the converging duct (108) below the group K2 is a to-be-fluidized opening (102); k3, \ 8230 \ 8230:, the discharge opening of the convergence duct (108) below the group K (n-1) is a fast screen opening (103); the lower part of the screening discharge hole (106) is also provided with a fast screen opening (103), and the total number of the fast screen openings (103) is (n-2).
8. The dust accurate removal system of claim 7, wherein the number of the fast screen air washing chambers (4) corresponds to the number of the fast screen openings (103) in a one-to-one manner; and/or
The multistage screening device (1) further comprises: a spring support structure (109) and an excitation driving device (1010); the spring support structure (109) is arranged below the screen body (104); the excitation drive (1010) is disposed on the screen body (104).
9. The dust accurate removal system of claim 7 or 8, wherein the fluidized air washing chamber (3) and the fast screening air washing chamber (4) are both air washing treatment devices; the air washing treatment device comprises: the wind washing device comprises a wind washing main cavity (A1), a porous wind distribution plate (A2), a wind spraying mechanism (A3) and a wind speed sensor (A4); the upper end of the air washing main cavity (A1) is provided with a feeding hole; the porous air distribution plate (A2) is horizontally arranged in the air washing main cavity (A1), and the porous air distribution plate (A2) supports dust materials to be fluidized; the air spraying mechanism (A3) is arranged in the air washing main cavity (A1), and the air spraying mechanism (A3) is positioned below the porous air distribution plate (A2); the wind speed sensor (A4) is arranged in the wind washing main cavity (A1), and the wind speed sensor (A4) is located above the porous wind distribution plate (A2).
10. The dust accurate removal system of claim 9, wherein the straight discharging device (2) is a wind washing processing device.
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