CN113941216B - Centrifugal activated carbon dust purification system and purification method thereof - Google Patents
Centrifugal activated carbon dust purification system and purification method thereof Download PDFInfo
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- CN113941216B CN113941216B CN202010693195.8A CN202010693195A CN113941216B CN 113941216 B CN113941216 B CN 113941216B CN 202010693195 A CN202010693195 A CN 202010693195A CN 113941216 B CN113941216 B CN 113941216B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 353
- 239000000428 dust Substances 0.000 title claims abstract description 243
- 238000000746 purification Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims description 42
- 238000005406 washing Methods 0.000 claims abstract description 71
- 238000009826 distribution Methods 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003546 flue gas Substances 0.000 claims abstract description 21
- 238000005243 fluidization Methods 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 81
- 229910052799 carbon Inorganic materials 0.000 claims description 39
- 239000002245 particle Substances 0.000 claims description 26
- 239000011148 porous material Substances 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 description 12
- 238000001179 sorption measurement Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000011882 ultra-fine particle Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
-
- 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
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
- B01D2259/40043—Purging
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A centrifugal activated carbon dust purification system, the system comprising a rotating cylinder; the inner space of the rotary cylinder forms a wind washing chamber; the outside of the rotary cylinder is provided with a wind cavity cover, and a wind cavity is formed between the wind cavity cover and the outer wall of the rotary cylinder; a porous distribution plate is arranged between the wind washing chamber and the wind chamber; the rotary cylinder is obliquely arranged; a central air distributor is arranged at the central position of the bottom of the air cavity cover; the side part of the rotary cylinder at the higher end of the horizontal position is provided with an activated carbon feeding hole, the lower part of the lower end of the horizontal position is provided with an activated carbon discharging hole, and the side part of the lower end of the horizontal position is provided with a flue gas outlet; the system also comprises a driving device connected with the rotary cylinder, and the driving device drives the rotary cylinder to rotate. According to the invention, through centrifugal movement of the activated carbon, the activated carbon forms a uniformly distributed bed layer along the circumference of the rotary cylinder, and fluidization wind washing is combined, so that the purification efficiency of the activated carbon dust is improved.
Description
Technical Field
The invention relates to a purification method of activated carbon dust, in particular to a centrifugal activated carbon dust purification system and a purification method thereof, and belongs to the technical field of dust purification.
Background
The activated carbon flue gas purification technology has the advantage of multi-pollutant synergistic efficient purification, and is suitable for the complex (SO) components of sintering flue gas 2 、NO x Dust, O 2 The method has the characteristics of high temperature fluctuation (110-180 ℃) and steam and heavy metal, has been successfully applied to a sintering flue gas purification system, is popularized to multiple industries such as coking and electric power, has a very good multi-pollutant removal effect, and has a very large popularization space under the extremely severe conditions of the current environment-friendly situation.
The active carbon flue gas purification process comprises three main devices of an adsorption tower, a regeneration tower and a conveyor, wherein the effective height of the tower body of the adsorption tower is about 30m, active carbon is used as an adsorbent and a catalyst to perform efficient adsorption on pollutants in the adsorption tower, the active carbon adsorbing the pollutants moves from top to bottom, is sent to the regeneration tower through a conveying system to be heated and regenerated, the active carbon is inevitably damaged due to the self-friction and analysis abrasion in the moving process, the initial columnar active carbon with complete morphology is changed into a finer active carbon mixture with different particle sizes, and the active carbon is subjected to heating regeneration in the analysis tower and then is screened by a vibrating screen to remove a part with smaller particle size, but the unavoidable active carbon with smaller particle size enters an adsorption system.
In the prior art, the classification of the common powder particles in the activated carbon is usually performed by a sieving method, however, the pore diameter of the sieve which is the finest at present is only about 20 mu m (namely about 600 meshes), and the particles with the diameter of more than 1 mu m can be captured by a direct interception effect. And particles less than 1 μm are captured by inertial impaction and diffusion interception effects.
According to the technological principle of the active carbon, after the active carbon from the adsorption tower is adsorbed, a large amount of fine particles such as dust are mixed in the surface and pores of the active carbon through the processes of direct interception, inertial impaction, diffusion interception and the like. The high temperature desorption after entering the desorption tower can generate a large amount of active carbon ultrafine particles, such as particles less than 1 mu m. After the analysis, a part of fine particles (the pores of the screen mesh are 1.2 mm) are removed by screening, but ultrafine particles attached to the surface and in the pores of the activated carbon are difficult to remove under the adsorption action of the activated carbon, so that the dust emission concentration of the activated carbon flue gas purification is higher.
The superfine carbon powder can influence the system safety in the adsorption tower, increase the operation cost and possibly increase the content of the outlet dust, so that the control of the content of the carbon powder entering the adsorption tower becomes the key of stably operating and efficiently realizing the ultralow emission of the dust of the flue gas purification system by the activated carbon method.
Therefore, how to reduce the dust emission concentration of the activated carbon flue gas purification is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a centrifugal activated carbon dust purification system having a dust removal function and a purification method thereof. According to the invention, the active carbon particles are fluidized, and the rotation of the rotary cylinder, namely the air washing chamber, drives the active carbon to centrifugally move, so that the active carbon forms a uniform distribution bed layer, superfine dust adhered to the active carbon is better purified, and the dust purification efficiency of the active carbon is improved.
According to a first embodiment of the present invention, a centrifugal activated carbon dust purification system is provided.
A centrifugal activated carbon dust purification system comprising a rotating cylinder. The inner space of the rotary cylinder forms a wind washing chamber. The outside of the rotary cylinder is provided with a wind cavity cover, and a wind cavity is formed between the wind cavity cover and the outer wall of the rotary cylinder. A porous distribution plate is arranged between the wind washing chamber and the wind chamber. The rotary cylinder is obliquely arranged. The center of the bottom of the wind cavity cover is provided with a center wind distributor. The side part of the higher end of the horizontal position of the rotary cylinder is provided with an activated carbon feeding hole, the lower part of the lower end of the horizontal position is provided with an activated carbon discharging hole, and the side part of the lower end of the horizontal position is provided with a flue gas outlet. The system also comprises a driving device connected with the rotary cylinder, and the driving device drives the rotary cylinder to rotate.
In the invention, the system further comprises a discharging channel connected with the active carbon discharging port, and the other end of the discharging channel is connected to the dust purifying detection chamber. The dust purification detection chamber is provided with an air inlet, an air outlet and an activated carbon outlet.
Preferably, a dust concentration detection device is arranged at an air outlet of the dust purification detection chamber.
In the invention, the system also comprises a first riding wheel and a second riding wheel which are arranged at two sides of the bottom of the rotary cylinder. The first riding wheel and the second riding wheel are used for supporting the rotary cylinder.
In the present invention, the system further comprises a first cylinder and a second cylinder. The first oil cylinder is arranged at the lower part of the first riding wheel and is connected with the first riding wheel, and the second oil cylinder is arranged at the lower part of the second riding wheel and is connected with the second riding wheel. The first oil cylinder and the second oil cylinder are used for adjusting the inclination of the rotary cylinder.
Preferably, the rotary cylinder is disposed obliquely. The inclination of the rotary cylinder is 2 to 10%, preferably 2.5 to 8%, more preferably 3 to 6%.
In the present invention, the aperture ratio of the porous distribution plate is 0.2 to 1.2%, more preferably 0.3 to 1%. Preferably, the open pore size of the porous distribution plate is less than 3mm, preferably less than 1.4mm, more preferably less than 1mm.
Preferably, the porous distribution plate and the wind cavity cover are annular.
Preferably, the system further comprises a distribution device connected to the activated carbon feed inlet of the rotating cylinder. Preferably, the distributing device is a screw feeder or a belt.
In the present invention, the system further comprises a fan disposed at the bottom of the rotating cylinder. The fan provides dust removal air quantity for the system through a central air distribution device at the bottom of the rotary cylinder.
According to a second embodiment of the present invention, there is provided a centrifugal activated carbon dust purification method.
A centrifugal activated carbon dust purification method or a method of purifying activated carbon using the system described in the first embodiment, the method comprising the steps of:
1) The bottom fan distributes wind into a wind chamber through a central wind distribution device, and the wind of the wind chamber enters a wind washing chamber in the rotary cylinder through a porous distribution plate to form dust removal airflow;
2) The activated carbon after analysis and screening is distributed into a rotary cylinder through a distributing device;
3) The active carbon enters the air washing chamber and is uniformly contacted with the dust removal airflow; the driving device drives the rotary cylinder to rotate, and the activated carbon centrifugally moves along the circumference of the rotary cylinder and forms a circle of annular fluidization area along the circumference; controlling the flow speed of the dedusting airflow to remove superfine dust in the activated carbon, and discharging the superfine dust from a flue gas outlet along with the airflow; preferably, the air flow carrying the superfine dust is discharged after dust removal;
4) And the activated carbon blown by the fluidization wind is discharged from an activated carbon discharge port of the rotary cylinder.
In the present invention, the method further comprises:
5) The discharged activated carbon enters a dust purification detection chamber, and the dust purification detection chamber is used for further wind washing of the activated carbon by controlling the flow rate of air inlet; the dust concentration detection device detects the dust concentration of air at an air outlet of the dust purification detection chamber;
when the detected dust concentration is 10mg/m or less 3 When the method is used, the requirements of activated carbon purification are met;
otherwise, the purification is not required, and the residence time of the activated carbon in the air washing chamber is increased by adjusting the heights of the first oil cylinder and the second oil cylinder and then adjusting the inclination of the rotary cylinder until the dust concentration detection device detects that the air dust concentration at the air outlet of the dust purification detection chamber meets the purification requirement.
In the present invention, the flow rate of the dust removing air flow is controlled in the step 3), specifically: controlling the flow speed u of the dust removing air flow entering the wind washing chamber 1 The method comprises the following steps:
wherein: u (u) 1 The flow rate of the dedusting air flow entering the wind washing chamber is that d is the particle size of superfine dust in the active carbon to be removed, d has the value of 1.4-5.6 mm, ρ is the fluid density, μ is the fluid viscosity, ρ p G is the gravity acceleration, which is the density of superfine dust in the active carbon to be removed.
Preferably, in step 5), the dust-cleaning detection chamber controls the air intake flow rate u 2 ＝u 1 。
Preferably, in step 3), according to a centripetal force formula of centrifugal motion formed by the activated carbon, the rotation speed n of the rotary cylinder is specifically:
since f=mω 2 r≥mg…………(2)；
ω＝2πn…………(3)；
The preparation method comprises the following steps:
wherein: n is the rotation speed, r is the radius of the rotary cylinder, g is the gravitational acceleration, F is the centripetal force, m is the mass of the activated carbon, and ω is the angular velocity of the rotary cylinder.
Further preferably, in step 5), according to the air dust concentration c at the air outlet of the dust purifying and detecting chamber detected by the dust concentration detecting device, the inclination of the rotary cylinder is adjusted in real time, so as to further control the residence time of the activated carbon in the air washing chamber, specifically:
setting the initial inclination of a rotary cylinder, and monitoring the air dust concentration at an air outlet of a dust purification detection chamber in real time by a dust concentration detection device; when the concentration c of the air dust is detected to be 5-10 mg/m 3 In this case, the inclination of the rotary cylinder is not adjusted.
When the concentration of air dust c is less than 5mg/m 3 At this time, the first cylinder is extended, the inclination of the rotary cylinder is increased, and the air washing time of the activated carbon is shortened until the air dust concentration c is 5-10 mg/m 3 Within the range.
When the concentration of air dust c is more than 10mg/m 3 At this time, the second cylinder is extended, the inclination of the rotary cylinder is reduced, and the air washing time of the activated carbon is prolonged until the air dust concentration c is 5-10 mg/m 3 In the range, namely, the wind washing efficiency of the activated carbon is ensured while the ultra-low emission of dust is satisfied.
In the invention, the centrifugal activated carbon dust purification system comprises a rotary cylinder, and the inner space of the rotary cylinder forms a wind washing chamber. The wind chamber is formed between the wind chamber cover arranged outside the rotary cylinder and the outer wall of the rotary cylinder. A porous distribution plate is arranged between the wind washing chamber and the wind chamber. The rotary cylinder is obliquely arranged, an activated carbon feed inlet is formed in the side part of the higher end of the rotary cylinder at the horizontal position, a smoke outlet is formed in the side part of the lower end of the rotary cylinder at the horizontal position, and an activated carbon discharge outlet is formed in the lower part of the lower end of the rotary cylinder at the horizontal position. The rotary cylinder is obliquely arranged, so that the activated carbon entering the rotary cylinder can move from high to low along the rotary cylinder. The central air distributor is arranged on the air cavity cover and positioned at the central position of the bottom of the air cavity, and is connected with the fan, and when the system operates, the fan provides dust removal air quantity for the system through the central air distributor.
Preferably, the invention is also provided with a driving device which is connected with the rotary cylinder and is used for driving the rotary cylinder to rotate. In the invention, the driving device drives the rotary cylinder to rotate at a certain speed, so that the activated carbon entering the inner space (namely the wind washing chamber) of the rotary cylinder moves along the rotary cylinder under the centrifugal action, and forms a circle of annular fluidization area along the outer ring of the rotary cylinder. When the system operates, the bottom fan distributes wind into the wind chamber through the central wind distribution device, wind in the wind chamber enters the rotary cylinder (namely the wind washing chamber) through the annular porous distribution plate, and as the activated carbon forms an annular fluidization area along the circumference of the rotary cylinder, the wind entering the wind washing chamber can better realize blowing of superfine dust in the activated carbon. Wherein the rotational speed of the rotating cylinderThe rotation speed n is the speed n for enabling the activated carbon particles to be madeThe pellets are centrifugally moved and form the rotational speed of the rotating cylinder of the annular fluidization area. In general, the rotational speed of the rotating cylinder is greater than 10rpm, preferably greater than 12rpm, and more preferably greater than 15rpm.
In the invention, the centrifugal activated carbon dust purification system further comprises a device capable of indirectly detecting the purification efficiency of the activated carbon dust. The device for detecting the dust purification efficiency by the indirect method mainly comprises a dust purification detection chamber arranged at an activated carbon discharge port and a dust concentration detection device arranged at an air outlet of the dust purification detection chamber. In the invention, an active carbon discharge port of the air washing chamber is connected with a discharge channel, and the other end of the discharge channel is connected to the dust purification detection chamber. The dust purification detection chamber is provided with an air inlet, an air outlet and an activated carbon outlet. Wherein, the air outlet department of dust purification detection room is equipped with dust concentration detection device. When the activated carbon is fluidized and air-washed in the air washing chamber and then discharged from the activated carbon discharge port through the discharge channel, the activated carbon enters the dust purification detection chamber, the dust purification detection chamber further air-washes the activated carbon by controlling the air speed, and the dust concentration detection device detects the dust concentration of air (or air flow) at the air outlet of the dust purification detection chamber, so that whether the dust purification meets the requirement is judged.
Preferably, the invention is also provided with a first riding wheel and a second riding wheel at two sides of the bottom of the rotary cylinder, and the first riding wheel and the second riding wheel are used for supporting the rotary cylinder. The invention also comprises a first oil cylinder which is arranged at the lower part of the first riding wheel and connected with the first riding wheel, and a second oil cylinder which is arranged at the lower part of the second riding wheel and connected with the second riding wheel, wherein the first oil cylinder and the second oil cylinder are used for adjusting the inclination of the rotary cylinder. When the dust concentration detected by the dust concentration detection device meets the purification requirement, discharging normally; when the dust concentration detected by the dust concentration detection device does not meet the purification requirement, the heights of the first oil cylinder and the second oil cylinder are adjusted, and then the gradient of the rotary cylinder is adjusted to increase the residence time of the activated carbon in the air washing chamber until the air dust concentration at the air outlet of the dust purification detection chamber meets the purification requirement.
Further preferably, the inclination of the rotary cylinder is based on a dust concentration detection deviceThe detected air dust concentration at the air outlet of the dust purifying detection chamber is adjusted in real time, and the specific adjustment method comprises the following steps: the initial inclination of the rotary cylinder is set to be 3%, for example, the dust concentration detection device monitors the air dust concentration at the air outlet of the dust purification detection chamber in real time. When the concentration c of the air dust is detected to be 5-10 mg/m 3 In this case, the inclination of the rotary cylinder is not adjusted. When the concentration of air dust c is less than 5mg/m 3 At the moment, the first oil cylinder stretches by 1mm, namely the inclination of the rotary cylinder is increased by stretching the first oil cylinder, so that the wind washing time of the activated carbon is shortened; detecting again after adjustment to determine the air dust concentration, if the dust concentration c is still less than 5mg/m 3 The first oil cylinder is extended by 1mm again; repeating the detection, judgment and adjustment until the air dust concentration c is 5-10 mg/m 3 Within the range. When the concentration of air dust c is more than 10mg/m 3 At the moment, the second oil cylinder stretches by 1mm, namely the inclination of the rotary cylinder is reduced, and the wind washing time of the activated carbon is prolonged; detecting again after adjustment to determine the air dust concentration, if the dust concentration c is still more than 10mg/m 3 The second cylinder is extended by 1mm again; repeating the detection, judgment and adjustment until the air dust concentration c is 5-10 mg/m 3 In the range, namely, the wind washing efficiency of the activated carbon is ensured while the ultra-low emission of dust is satisfied. Therefore, the inclination of the rotary cylinder can be adjusted according to the dust concentration detected by the dust concentration detection device, so that the feedback adjustment can be realized more rapidly and accurately, and the purification efficiency of the activated carbon dust is ensured. In general, the inclination of the rotary cylinder is 2 to 10%, preferably 2.5 to 8%, more preferably 3 to 6%. In the invention, the concentration of air dust at the air outlet of the dust purifying detection chamber is less than or equal to 10mg/m 3 The dust concentration of the activated carbon after wind washing is considered to meet the purification requirement.
In the invention, a porous distribution plate is arranged between the wind chamber and the wind washing chamber. In order to realize uniform distribution of the air flow in the wind washing chamber, the aperture ratio of the porous distribution plate is 0.2-1.2%, preferably 0.3-1%. In combination with the control of the flow rate of the dedusting air flow, the aperture of the porous distribution plate can be set to be smaller than 3mm, preferably smaller than 1.4mm, more preferably smaller than 1mm, so that the dedusting air flow can pass through and meanwhile active carbon or dust can be prevented from entering the air chamber. In the invention, the porous distribution plate and the wind cavity cover are both arranged in a ring shape.
In the invention, the activated carbon is fed after being fed into the rotary cylinder (through the distributing device) before being distributed into the rotary cylinder, so that the activated carbon is prevented from being broken, and the activated carbon is also convenient to form a particle fluidization state better, so that superfine dust adhered to the activated carbon is removed. The distribution of the activated carbon after analytical sieving is shown in the following table.
| Particle size distribution/mm | ≥11.2 | 5.6-11.2 | 1.4-5.6 | ≤1.4 |
| Vibrating screen feeding/% | 0 | 74.4 | 25 | 0.6 |
The dust purification of the present invention aims at removing dust of 1.4mm or less with a proportion of 0.6%, but cannot remove activated carbon particles with a proportion of 74.4%.
In the invention, the flow speed u of the dedusting air flow entering the wind washing chamber is controlled 1 The method comprises the following steps:
here, the flow rate u 1 Wind speed for enabling the active carbon superfine dust particles with the particle size d to be in a fluidized state. The dust purification aim of the invention is to remove the dust with the particle size less than or equal to 1.4mm, and retain the activated carbon with the particle size of 5.6-11.2 mm, so the value range of d in the formula (1) can be 1.4-5.6 mm, namely, the corresponding wind speed ensures that the activated carbon particles with the particle size of 1.4-5.6 mm are in a fluidized state to better realize gas-solid contact dust removal, at the moment, the dust with the particle size less than or equal to 1.4mm is completely blown away (discharged from a flue gas outlet of a rotary cylinder), and the activated carbon with the particle size of 5.6-11.2 mm is retained, thereby ensuring the purification efficiency of the activated carbon dust.
In addition, after the activated carbon purified by the air washing chamber is discharged from the discharge channel, the activated carbon enters a dust purification detection chamber, and the dust purification detection chamber controls the wind speed u 2 ＝u 1 And (3) performing fluidization air washing on the activated carbon again, so as to further ensure the dust purification effect.
The outer diameter of the rotary cylinder is generally 3 to 15m, more preferably 3.5 to 10m, and still more preferably 4 to 8m.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the inner space of the rotary cylinder which is obliquely arranged in the invention forms a wind washing chamber, active carbon particles are utilized to fluidize in the wind washing chamber, so that ultrafine dust in the active carbon is removed, and meanwhile, large-particle active carbon is reserved;
2. according to the invention, through centrifugal movement of the activated carbon, the activated carbon forms a uniformly distributed bed layer along the circumference of the rotary cylinder, and fluidization wind washing is combined, so that dust purification efficiency is improved;
3. according to the invention, the dust purification detection chamber and the dust concentration detection device are arranged at the activated carbon discharge port, so that the discharged activated carbon is subjected to fluidization air washing again while the purification efficiency of the activated carbon dust is detected, and the air washing effect of the activated carbon is further ensured;
4. the invention provides an activated carbon dust purification evaluation method, which is characterized in that whether the purification efficiency of activated carbon dust meets the requirement is evaluated by detecting the concentration of the air dust in an activated carbon purification detection chamber, and the inclination of a rotary cylinder can be adjusted by adjusting the heights of two oil cylinders supported at the bottom of the rotary cylinder under the condition that the dust purification efficiency is not up to the requirement, so that the residence time of the activated carbon is controlled, and the feedback of the activated carbon purification detection chamber is used for ensuring that the dust purification efficiency meets the requirement.
Drawings
FIG. 1 is a schematic diagram of a centrifugal activated carbon dust purification system according to the present invention;
FIG. 2 is a side view of a centrifugal activated carbon dust purification system of the present invention;
FIG. 3 is a flow chart of the control of tilt of the rotating cylinder of the present invention;
fig. 4 is a flow chart of the activated carbon dust purification system of the present invention for an activated carbon flue gas treatment process.
In fig. 4: in order to reduce the dust content entering the flue gas purification system, the active carbon dust purification system is added to the active carbon flue gas purification process.
Reference numerals:
1: a rotary cylinder; 2: a wind washing chamber; 3: a wind chamber cover; 301: a wind chamber; 4: a porous distribution plate; 5: a central air distributor; 6: an activated carbon feed inlet; 7: an active carbon discharge port; 8: a flue gas outlet; 9: a driving device; 10: a dust purification detection chamber; 1001: an air inlet; 1002: an air outlet; 1003: an activated carbon outlet; 11: a dust concentration detection device; 1201: a first riding wheel; 1202: a second riding wheel; 1301: a first cylinder; 1302: a second cylinder; 14: a material distribution device; l1: and a discharging channel.
Detailed Description
According to a first embodiment of the present invention, a centrifugal activated carbon dust purification system is provided.
A centrifugal activated carbon dust purification system, comprising a rotating cylinder 1. The inner space of the rotary cylinder 1 constitutes a wind washing chamber 2. The outside of the rotary cylinder 1 is provided with a wind chamber cover 3, and a wind chamber 301 is formed between the wind chamber cover 3 and the outer wall of the rotary cylinder 1. A porous distribution plate 4 is arranged between the wind washing chamber 2 and the wind chamber 301. The rotary cylinder 1 is arranged obliquely. The center of the bottom of the wind cavity cover 3 is provided with a center wind distributor 5. The side part of the higher end of the horizontal position of the rotary cylinder 1 is provided with an activated carbon feed inlet 6, the lower part of the lower end of the horizontal position is provided with an activated carbon discharge outlet 7, and the side part of the lower end of the horizontal position is provided with a flue gas outlet 8. The system further comprises a driving device 9 connected with the rotating cylinder 1, wherein the driving device 9 drives the rotating cylinder 1 to rotate.
In the present invention, the system further includes a discharge passage L1 connected to the activated carbon discharge port 7, and the other end of the discharge passage L1 is connected to the dust-cleaning detection chamber 10. The dust purification detection chamber 10 is provided with an air inlet 1001, an air outlet 1002 and an activated carbon outlet 1003.
Preferably, the dust concentration detecting device 11 is disposed at the air outlet 1002 of the dust purifying and detecting chamber 10.
In the present invention, the system further comprises a first idler 1201 and a second idler 1202 arranged on both sides of the bottom of the rotating cylinder 1. The first and second idlers 1201 and 1202 are for supporting the rotating cylinder 1.
In the present invention, the system further includes a first cylinder 1301 and a second cylinder 1302. Wherein, the first cylinder 1301 is arranged at the lower part of the first riding wheel 1201 and is connected with the first riding wheel, and the second cylinder 1302 is arranged at the lower part of the second riding wheel 1202 and is connected with the second riding wheel. The first cylinder 1301 and the second cylinder 1302 are used to adjust the inclination of the revolving cylinder 1.
Preferably, the revolving cylinder 1 is arranged obliquely. The inclination of the rotary cylinder 1 is 2 to 10%, preferably 2.5 to 8%, more preferably 3 to 6%.
In the present invention, the aperture ratio of the porous distribution plate 4 is 0.2 to 1.2%, more preferably 0.3 to 1%. Preferably, the open pore size of the porous distribution plate 4 is less than 3mm, preferably less than 1.4mm, more preferably less than 1mm.
Preferably, the porous distribution plate 4 and the fan housing 3 are both annular.
Preferably, the system further comprises a distribution device 14 connected to the activated carbon feed opening 6 of the rotating cylinder 1. Preferably, the distributing device 14 is a screw feeder or a belt.
In the present invention, the system further comprises a fan arranged at the bottom of the rotating cylinder 1. The fan provides dust removal air quantity for the system through a central air distribution device 5 at the bottom of the rotary cylinder 1.
According to a second embodiment of the present invention, there is provided a centrifugal activated carbon dust purification method.
A centrifugal activated carbon dust purification method or a method of purifying activated carbon using the system described in the first embodiment, the method comprising the steps of:
1) The bottom fan distributes air into the air chamber 301 through the central air distribution device 5, and the air in the air chamber 301 enters the air washing chamber 2 in the rotary cylinder 1 through the porous distribution plate 4 to form dust removing air flow;
2) The activated carbon after analysis and screening is distributed into the rotary cylinder 1 through the distributing device 14;
3) The active carbon enters the wind washing chamber 2 to be uniformly contacted with the dust removal airflow; the driving device 9 drives the rotary cylinder 1 to rotate, and the activated carbon centrifugally moves along the circumference of the rotary cylinder 1 and forms a circle of annular fluidization area along the circumference; the flow speed of the dedusting airflow is controlled, so that the superfine dust in the activated carbon is removed, and the superfine dust is discharged from a flue gas outlet 8 along with the airflow; preferably, the air flow carrying the superfine dust is discharged after dust removal;
4) The activated carbon blown by the fluidization wind is discharged from the activated carbon discharge port 7 of the rotary cylinder 1.
In the present invention, the method further comprises:
5) The discharged activated carbon enters a dust purification detection chamber 10, and the dust purification detection chamber 10 further wind washes the activated carbon by controlling the flow rate of air inlet; the dust concentration detection device 11 detects the dust concentration of the air at the air outlet 1002 of the dust purification detection chamber 10;
when the detected dust concentration is 10mg/m or less 3 When the method is used, the requirements of activated carbon purification are met;
otherwise, it indicates that the cleaning is not required, and at this time, the residence time of the activated carbon in the air washing chamber 2 is increased by adjusting the heights of the first cylinder 1301 and the second cylinder 1302 and then adjusting the inclination of the rotary cylinder 1 until the dust concentration detection device 11 detects that the air dust concentration at the air outlet 1002 of the dust cleaning detection chamber 10 meets the cleaning requirement.
In the present invention, the flow rate of the dust removing air flow is controlled in the step 3), specifically: controlling the flow speed u of the dedusting air flow entering the wind washing chamber 2 1 The method comprises the following steps:
wherein: u (u) 1 The flow rate of the dedusting air flow entering the wind washing chamber is that d is the particle size of superfine dust in the active carbon to be removed, d has the value of 1.4-5.6 mm, ρ is the fluid density, μ is the fluid viscosity, ρ p G is the gravity acceleration, which is the density of superfine dust in the active carbon to be removed.
Preferably, in step 5), the dust-cleaning detection chamber 10 controls the air intake flow rate u 2 ＝u 1 。
Preferably, in step 3), according to the centripetal force formula of the centrifugal motion formed by the activated carbon, the rotation speed n of the rotary cylinder 1 is specifically:
since f=mω 2 r≥mg…………(2)；
ω＝2πn…………(3)；
The preparation method comprises the following steps:
in the formula (4): n is the rotation speed, r is the radius of the rotary cylinder, and g is the gravitational acceleration.
Further preferably, in step 5), the inclination of the rotary cylinder 1 is adjusted in real time according to the air dust concentration c at the air outlet 1002 of the dust purification detection chamber 10 detected by the dust concentration detection device 11, so as to control the residence time of the activated carbon in the air washing chamber 2, specifically:
setting an initial inclination of the rotary cylinder 1, the dust concentration detecting device 11 detects the dustThe concentration of air dust at the air outlet 1002 of the dust purifying and detecting chamber 10 is monitored in real time; when the concentration c of the air dust is detected to be 5-10 mg/m 3 In this case, the inclination of the rotary cylinder 1 is not adjusted.
When the concentration of air dust c is less than 5mg/m 3 At this time, the first cylinder 1301 is extended, the inclination of the rotary cylinder 1 is increased, and the air washing time of the activated carbon is shortened until the air dust concentration c is 5 to 10mg/m 3 Within the range.
When the concentration of air dust c is more than 10mg/m 3 At this time, the second cylinder 1302 is extended, the inclination of the rotary cylinder 1 is reduced, and the air washing time of the activated carbon is prolonged until the air dust concentration c is 5 to 10mg/m 3 In the range, namely, the wind washing efficiency of the activated carbon is ensured while the ultra-low emission of dust is satisfied.
Example 1
As shown in fig. 1 and 2, a centrifugal activated carbon dust cleaning system includes a rotating cylinder 1. The inner space of the rotary cylinder 1 constitutes a wind washing chamber 2. The outside of the rotary cylinder 1 is provided with a wind chamber cover 3, and a wind chamber 301 is formed between the wind chamber cover 3 and the outer wall of the rotary cylinder 1. A porous distribution plate 4 is arranged between the wind washing chamber 2 and the wind chamber 301. The rotary cylinder 1 is arranged obliquely. The center of the bottom of the wind cavity cover 3 is provided with a center wind distributor 5. The side part of the higher end of the horizontal position of the rotary cylinder 1 is provided with an activated carbon feed inlet 6, the lower part of the lower end of the horizontal position is provided with an activated carbon discharge outlet 7, and the side part of the lower end of the horizontal position is provided with a flue gas outlet 8. The system further comprises a driving device 9 connected with the rotating cylinder 1, wherein the driving device 9 drives the rotating cylinder 1 to rotate. The porous distribution plate 4 and the wind cavity cover 3 are annular.
Example 2
Example 1 was repeated except that the system further included a discharge passage L1 connected to the activated carbon discharge port 7, and the other end of the discharge passage L1 was connected to the dust-cleaning detection chamber 10. The dust purification detection chamber 10 is provided with an air inlet 1001, an air outlet 1002 and an activated carbon outlet 1003. The dust concentration detection device 11 is arranged at the air outlet 1002 of the dust purification detection chamber 10.
Example 3
Example 2 is repeated except that the system further comprises a first idler 1201 and a second idler 1202 arranged on both sides of the bottom of the rotating cylinder 1. The first and second idlers 1201 and 1202 are for supporting the rotating cylinder 1. The system also includes a first cylinder 1301 and a second cylinder 1302. Wherein, the first cylinder 1301 is arranged at the lower part of the first riding wheel 1201 and is connected with the first riding wheel, and the second cylinder 1302 is arranged at the lower part of the second riding wheel 1202 and is connected with the second riding wheel. The first cylinder 1301 and the second cylinder 1302 are used to adjust the inclination of the revolving cylinder 1.
Example 4
Example 3 was repeated except that the inclination of the rotating cylinder 1 was 3%.
Example 5
Example 4 was repeated except that the aperture ratio of the porous distribution plate 4 was 0.6%. The open pore diameter of the porous distribution plate 4 is smaller than 3mm.
Example 6
Example 5 is repeated except that the system further comprises a distribution device 14 connected to the activated carbon feed opening 6 of the rotating cylinder 1. The material distribution device 14 is a screw feeder.
Example 7
Example 6 was repeated except that the system further included a fan disposed at the bottom of the rotating cylinder 1. The fan provides dust removal air quantity for the system through a central air distribution device 5 at the bottom of the rotary cylinder 1.
Example 8
A centrifugal activated carbon dust purification method using the purification system of example 7, comprising the steps of:
1) The bottom fan distributes air into the air chamber 301 through the central air distribution device 5, and the air in the air chamber 301 enters the air washing chamber 2 in the rotary cylinder 1 through the porous distribution plate 4 to form dust removing air flow;
2) The activated carbon after analysis and screening is distributed into the rotary cylinder 1 through the distributing device 14;
3) The active carbon enters the wind washing chamber 2 to be uniformly contacted with the dust removal airflow; the driving device 9 drives the rotary cylinder 1 to rotate, and the activated carbon centrifugally moves along the circumference of the rotary cylinder 1 and forms a circle of annular fluidization area along the circumference; the flow speed of the dedusting airflow is controlled, so that the superfine dust in the activated carbon is removed, and the superfine dust is discharged from a flue gas outlet 8 along with the airflow;
4) The activated carbon blown by the fluidization wind is discharged from the activated carbon discharge port 7 of the rotary cylinder 1.
Example 9
Example 8 was repeated except that in step 3), the air stream carrying the ultrafine dust was discharged after dust removal.
Example 10
Example 9 was repeated except that the method further comprises:
5) The discharged activated carbon enters a dust purification detection chamber 10, and the dust purification detection chamber 10 further wind washes the activated carbon by controlling the flow rate of air inlet; the dust concentration detection device 11 detects the dust concentration of the air at the air outlet 1002 of the dust purification detection chamber 10;
when the detected dust concentration is 10mg/m or less 3 When the method is used, the requirements of activated carbon purification are met;
otherwise, it indicates that the cleaning is not required, and at this time, the residence time of the activated carbon in the air washing chamber 2 is increased by adjusting the heights of the first cylinder 1301 and the second cylinder 1302 and then adjusting the inclination of the rotary cylinder 1 until the dust concentration detection device 11 detects that the air dust concentration at the air outlet 1002 of the dust cleaning detection chamber 10 meets the cleaning requirement.
The specific adjustment method of the inclination of the rotary cylinder 1 according to the air dust concentration c at the air outlet 1002 of the dust purifying and detecting chamber 10 detected by the dust concentration detecting device 11 is as follows:
setting the initial inclination of the rotary cylinder 1 to be 3%, and monitoring the air dust concentration at the air outlet 1002 of the dust purification detection chamber 10 in real time by the dust concentration detection device 11; when the concentration c of the air dust is detected to be 5-10 mg/m 3 In this case, the inclination of the rotary cylinder 1 is not adjusted.
When the concentration of air dust c is less than 5mg/m 3 At this time, the first cylinder 1301 is extended, the inclination of the rotary cylinder 1 is increased, and the air washing time of the activated carbon is shortened until the air dust concentration c is 5 to 10mg/m 3 Within the range.
When the concentration of air dust c is more than 10mg/m 3 At this time, the second cylinder 1302 is extended, the inclination of the rotary cylinder 1 is reduced, and the air washing time of the activated carbon is prolonged until the air dust concentration c is 5 to 10mg/m 3 In the range, namely, the wind washing efficiency of the activated carbon is ensured while the ultra-low emission of dust is satisfied.
Example 11
Example 10 was repeated except that the flow rate of the dedusting air stream was controlled as described in step 3), specifically: controlling the flow speed u of the dedusting air flow entering the wind washing chamber 2 1 The method comprises the following steps:
wherein: the particle size d=2mm=0.002 m of the ultrafine dust in the activated carbon to be removed, the air density ρ=1.205 kg/m 3 Air viscosity μ= 0.00001809pa·s, density ρ of ultrafine dust in activated carbon to be removed p 1074kg/h, g=9.8 m/s 2 ；
I.e. the flow rate of the dedusting air flow into the wind washing chamber 2 is controlled to be 1.4m/s.
Example 12
Example 11 was repeated except that in step 5), the dust-cleaning inspection chamber 10 controlled the inlet air flow rate u 2 ＝u 1 ＝1.4m/s。
Example 13
Example 12 was repeated except that in step 3), the rotational speed n of the rotating cylinder 1 was specifically:
since f=mω 2 r≥mg…………(2)；
ω＝2πn…………(3)；
The preparation method comprises the following steps:
wherein: radius r=2m of the revolving cylinder, gravitational acceleration g=9.8m/s 2 The preparation method comprises the following steps:
namely, the rotational speed of the rotary cylinder 1 is 0.35r/s or more.
Claims (17)
1. A centrifugal activated carbon dust purification system comprising a rotating cylinder (1); the inner space of the rotary cylinder (1) forms a wind washing chamber (2); the outside of the rotary cylinder (1) is provided with a wind cavity cover (3), and a wind cavity (301) is formed between the wind cavity cover (3) and the outer wall of the rotary cylinder (1); a porous distribution plate (4) is arranged between the wind washing chamber (2) and the wind chamber (301); the rotary cylinder (1) is obliquely arranged; a central air distributor (5) is arranged at the central position of the bottom of the air cavity cover (3); the side part of the higher end of the horizontal position of the rotary cylinder (1) is provided with an activated carbon feeding hole (6), the lower part of the lower end of the horizontal position is provided with an activated carbon discharging hole (7), and the side part of the lower end of the horizontal position is provided with a flue gas outlet (8); the system also comprises a driving device (9) connected with the rotary cylinder (1), wherein the driving device (9) drives the rotary cylinder (1) to rotate;
the system also comprises a discharge channel (L1) connected with the active carbon discharge port (7), and the other end of the discharge channel (L1) is connected to the dust purification detection chamber (10); the dust purification detection chamber (10) is provided with an air inlet (1001), an air outlet (1002) and an active carbon outlet (1003); a dust concentration detection device (11) is arranged at an air outlet (1002) of the dust purification detection chamber (10); the system also comprises a first riding wheel (1201) and a second riding wheel (1202) which are arranged at two sides of the bottom of the rotary cylinder (1); the first riding wheel (1201) and the second riding wheel (1202) are used for supporting the rotary cylinder (1); the system further includes a first cylinder (1301) and a second cylinder (1302); the first oil cylinder (1301) is arranged at the lower part of the first riding wheel (1201) and is connected with the first riding wheel, and the second oil cylinder (1302) is arranged at the lower part of the second riding wheel (1202) and is connected with the second riding wheel; the first oil cylinder (1301) and the second oil cylinder (1302) are used for adjusting the inclination of the rotary cylinder (1); the system also comprises a distributing device (14) connected with the active carbon feeding port (6) of the rotary cylinder (1); the system also comprises a fan arranged at the bottom of the rotary cylinder (1).
2. The system according to claim 1, wherein: the rotary cylinder (1) is obliquely arranged; the inclination of the rotary cylinder (1) is 2-10%.
3. The system according to claim 2, wherein: the inclination of the rotary cylinder (1) is 2.5-8%.
4. A system according to claim 3, characterized in that: the inclination of the rotary cylinder (1) is 3-6%.
5. The system according to any one of claims 1-4, wherein: the aperture ratio of the porous distribution plate (4) is 0.2-1.2%.
6. The system according to claim 5, wherein: the aperture ratio of the porous distribution plate (4) is 0.3-1%.
7. The system according to claim 5, wherein: the aperture diameter of the porous distribution plate (4) is smaller than 3mm.
8. The system according to claim 7, wherein: the pore diameter of the porous distribution plate (4) is smaller than 1.4mm.
9. The system according to claim 8, wherein: the aperture diameter of the porous distribution plate (4) is smaller than 1mm.
10. The system according to claim 5, wherein: the porous distribution plate (4) and the wind cavity cover (3) are annular.
11. The system according to any one of claims 1-4, 6-10, wherein: the material distribution device (14) is a screw feeder or a belt; and/or
The fan provides dust removal air quantity for the system through a central air distribution device (5) at the bottom of the rotary cylinder (1).
12. A method of purifying activated carbon using the system of any one of claims 1-11, the method comprising the steps of:
1) The bottom fan distributes air into the air chamber (301) through the central air distribution device (5), and the air in the air chamber (301) enters the air washing chamber (2) in the rotary cylinder (1) through the porous distribution plate (4) to form dust removal air flow;
2) The activated carbon after analysis and screening is distributed into a rotary cylinder (1) through a distributing device (14);
3) The active carbon enters the wind washing chamber (2) to be uniformly contacted with dust removal airflow; the driving device (9) drives the rotary cylinder (1) to rotate, and the activated carbon centrifugally moves along the circumference of the rotary cylinder (1) and forms a circle of annular fluidization area along the circumference; the flow speed of the dedusting airflow is controlled, so that the superfine dust in the activated carbon is removed, and the superfine dust is discharged from a flue gas outlet (8) along with the airflow;
4) The activated carbon blown by the fluidization wind is discharged from an activated carbon discharge port (7) of the rotary cylinder (1);
5) The discharged activated carbon enters a dust purification detection chamber (10), and the dust purification detection chamber (10) further wind washes the activated carbon by controlling the flow rate of air inlet; the dust concentration detection device (11) detects the dust concentration of air at an air outlet (1002) of the dust purification detection chamber (10);
when the detected dust concentration is 10mg/m or less 3 When the method is used, the requirements of activated carbon purification are met;
otherwise, the purification is not required, and at the moment, the residence time of the activated carbon in the air washing chamber (2) is increased by adjusting the heights of the first oil cylinder (1301) and the second oil cylinder (1302) and then adjusting the inclination of the rotary cylinder (1) until the dust concentration detection device (11) detects that the air dust concentration at the air outlet (1002) of the dust purification detection chamber (10) meets the purification requirement.
13. The method according to claim 12, wherein: in the step 3), the air flow carrying the superfine dust is discharged after dust removal.
14. The method according to claim 12, wherein: the flow rate of the dust removing airflow is controlled in the step 3), specifically: controlling the flow speed u of the dedusting air flow entering the wind washing chamber (2) 1 The method comprises the following steps:
wherein: u (u) 1 The flow rate of the dedusting airflow entering the wind washing chamber is d, the particle size of superfine dust in the active carbon to be removed is d, ρ is the fluid density, μ is the fluid viscosity, ρ p G is the gravity acceleration, which is the density of superfine dust in the active carbon to be removed.
15. The method according to claim 14, wherein: in the step 5), the dust purification detection chamber (10) controls the air inlet flow speed u 2 ＝u 1 。
16. The method according to any one of claims 12-15, characterized in that: in the step 3), according to a centripetal force formula of centrifugal motion formed by the activated carbon, the rotating speed n of the rotary cylinder (1) is specifically:
since f=mω 2 r≥mg…………(2)；
ω＝2πn…………(3)；
The preparation method comprises the following steps:
in the formula (4): n is the rotation speed, r is the radius of the rotary cylinder, and g is the gravitational acceleration.
17. The method according to any one of claims 12-15, characterized in that: in step 5), according to the air dust concentration c at the air outlet (1002) of the dust purification detection chamber (10) detected by the dust concentration detection device (11), the inclination of the rotary cylinder (1) is adjusted in real time, so as to control the residence time of the activated carbon in the air washing chamber (2), specifically:
setting the initial inclination of the rotary cylinder (1), and monitoring the air dust concentration at an air outlet (1002) of the dust purification detection chamber (10) in real time by a dust concentration detection device (11); when the concentration c of the air dust is detected to be 5-10 mg/m 3 When the inclination of the rotary cylinder (1) is not adjusted;
when the concentration of air dust c is less than 5mg/m 3 At this time, the first cylinder (1301) is extended, the inclination of the rotary cylinder (1) is increased, and the air washing time of the activated carbon is shortened until the air dust concentration c is 5-10 mg/m 3 Within the range;
when the concentration of air dust c is more than 10mg/m 3 At this time, the second cylinder (1302) is extended, the inclination of the rotary cylinder (1) is reduced, and the air washing time of the activated carbon is prolonged until the air dust concentration c is 5-10 mg/m 3 In the range, namely, the wind washing efficiency of the activated carbon is ensured while the ultra-low emission of dust is satisfied.
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