CN113813920A - Activated carbon for adsorbing dioxin in waste incineration flue gas and preparation method thereof - Google Patents
Activated carbon for adsorbing dioxin in waste incineration flue gas and preparation method thereof Download PDFInfo
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- CN113813920A CN113813920A CN202111281920.1A CN202111281920A CN113813920A CN 113813920 A CN113813920 A CN 113813920A CN 202111281920 A CN202111281920 A CN 202111281920A CN 113813920 A CN113813920 A CN 113813920A
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- activated carbon
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- flue gas
- waste incineration
- incineration flue
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- 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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
Abstract
The invention relates to the technical field of adsorption materials, in particular to activated carbon for adsorbing dioxin in waste incineration flue gas and a preparation method thereof, and the preparation method of the activated carbon for adsorbing the dioxin in the waste incineration flue gas comprises the following steps: s1, mixing the coal powder, water, the catalyst and the coal tar, and stirring to form coal particles; s2, putting the coal particles into a furnace for heating and drying to form activated carbon; s3, putting the activated carbon into inert gas, cooling, and grinding and crushing the activated carbon; s4, sequentially putting the crushed activated carbon particles into an acidic compound and a basic compound, and washing; s5, taking out the washed activated carbon particles, and carrying out air separation; according to the invention, the catalyst and the coal powder are contacted in a furnace through a heating reaction, so that the pore size distribution of the generated activated carbon is controlled to be concentrated, the adsorption effect on dioxin is increased, and the adsorption rate is improved.
Description
Technical Field
The invention relates to the technical field of adsorption materials, in particular to activated carbon for adsorbing dioxin in waste incineration flue gas and a preparation method thereof.
Background
Dioxin is a colorless, tasteless and fat-soluble substance with high toxicity, has very stable property and higher melting point, is very difficult to dissolve in water, is very easy to accumulate in organisms and has great harm to human bodies.
Dioxin is generated in the incineration of household garbage, the incineration smoke needs to be treated, and otherwise, secondary pollution can be caused. The activated carbon has huge specific surface area and unique pore size structure, is mainly used for absorbing various pollutants and is also an adsorbing material for removing dioxin. In the market, activated carbon is generally sprayed by an activated carbon nozzle and then captured and collected, and certain requirements are imposed on the particle size of the activated carbon. The activated carbon is adsorbed in the contact process with the flue gas, but the activated carbon belongs to combustible materials, and the high-temperature flue gas can burn the activated carbon.
Disclosure of Invention
The invention aims to provide activated carbon for adsorbing dioxin in waste incineration flue gas and a preparation method thereof, and solves the problems.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of activated carbon for adsorbing dioxin in waste incineration flue gas comprises the following steps:
s1, mixing the coal powder, water, the catalyst and the coal tar, and stirring to form coal particles;
s2, putting the coal particles into a furnace for heating and drying to form activated carbon;
s3, putting the activated carbon into inert gas, cooling, and grinding and crushing the activated carbon;
s4, sequentially putting the crushed activated carbon particles into an acidic compound and a basic compound, and washing;
and S5, taking out the washed activated carbon particles, and performing air separation.
Further, the pulverized coal includes one or more of anthracite, lean coal, and weakly caking coal.
Further, the device for grinding and crushing the activated carbon in the step S3 includes a machine body, a working chamber penetrating upwards is arranged in the machine body, a sealing cover detachably connected to the machine body is mounted on the machine body, a motor is mounted on a side wall of the working chamber, a grinding device for crushing the activated carbon is connected to an output shaft of the motor, a rotating shaft is rotatably mounted on the side wall of the working chamber along an axial direction of the output shaft of the motor, and the rotating shaft is connected to the grinding device; arrange the material pipe back flow that is equipped with in the organism, arrange material pipe one end and run through the organism, arrange the material pipe other end and stretch into the working chamber diapire, arrange the material pipe in the working chamber is connected with the funnel, the funnel is located grinder below.
Further, the grinding device comprises a grinding block, the grinding block is connected with the rotating shaft and the motor, a grinding cavity is arranged in the grinding block, the grinding block is provided with a through hole which penetrates through the rotating shaft in the radial direction, a rolling ball is arranged in the grinding cavity, and the diameter of the rolling ball is larger than that of the through hole.
Furthermore, the grinding block is provided with a filter hole at the through hole, and the diameter of the filter hole is smaller than that of the through hole.
Further, the hydraulic stem of fixed connection is installed to the working chamber bottom wall, the hydraulic stem with funnel outer wall connection, funnel lower extreme fixedly connected with is flexible, flexible pipe with arrange the material union coupling.
Further, the grinding ball has been placed in the funnel, the grinding ball diameter is greater than funnel lower extreme export diameter, the hydraulic stem upwards stretches out, the grinding block the through-hole when towards the top, the grinding block with the grinding ball roll the cooperation.
Further, the upper end face of the sealing cover is provided with a fan, a backflow pipe is fixedly connected to the discharging pipe, the backflow pipe and the fan are detachably connected, the fan is connected with a feeding pipeline, the lower end of the feeding pipeline penetrates through the sealing cover, and the upper end of the feeding pipeline extends out of the fan.
Further, the alkaline compound is one or more of potassium hydroxide, sodium hydroxide and calcium hydroxide, the alkaline compound is used for neutralizing the acidic compound, and the activated carbon is washed by the alkaline compound and then washed by purified water until no residue is left.
Compared with the prior art, the invention has the beneficial effects that: the catalyst and the coal powder are in heating reaction contact in the furnace, so that the pore size distribution of the generated activated carbon is controlled to be concentrated, the adsorption effect on dioxin is increased, the adsorption rate is improved, the impurity content in the activated carbon is controlled by washing the acidic compound and the alkaline compound, and the uncontrollable external influence of the activated carbon caused by high temperature is reduced; meanwhile, the active carbon powder suitable for nozzle injection can be properly selected through winnowing separation, and the working requirements are met.
Drawings
Fig. 1 is a block diagram illustrating a process according to an embodiment of the present invention.
FIG. 2 is a schematic view of an overall structure of a polishing apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a working chamber of a polishing apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view illustrating an operating state of a polishing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating a polishing block of the polishing apparatus according to an embodiment of the invention.
In the figure: 11. a sealing cover; 12. a fan; 13. a feed conduit; 21. a body; 22. a return pipe; 24. a working chamber; 25. a fan; 31. a partition plate; 32. a discharge outlet; 41. grinding blocks; 42. a connecting shaft; 43. a motor; 44. filtering the holes; 45. a grinding chamber; 46. a through hole; 51. a funnel; 52. a telescopic pipe; 53. a hydraulic lever; 54. and (5) rolling the ball.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a method for preparing activated carbon for adsorbing dioxin in waste incineration flue gas, which is characterized in that: the method comprises the following steps:
s1, mixing coal powder, water, a catalyst and coal tar, wherein the coal tar is used as a binder to form coal particles, the coal powder comprises multiple anthracites, meager coals and weakly caking coals, the anthracites, the meager coals and the weakly caking coals are mixed according to the proportion of 1:3:10, the anthracites, the meager coals or the weakly caking coals are ground into fine particles through rolling to form coal powder, and the coal powder, the water, the catalyst and the coal tar are stirred and mixed uniformly to form mixed coal particles;
s2, putting the coal particles into a carbonization furnace, heating and drying, carbonizing at 500 ℃ for 3-5 hours, and solidifying the coal particles to form activated carbon;
s3, introducing inert gas after the activated carbon is formed, and protecting the activated carbon by the inert gas, so that the activated carbon is cooled to 100 ℃, and after the activated carbon is cooled, grinding and crushing the activated carbon, wherein the activated carbon powder is crushed into fine particles for adsorbing dioxin;
s4, sequentially putting the crushed activated carbon particles into an acidic compound and an alkaline compound, putting the cooled activated carbon into an inorganic acid for washing, optionally stirring and heating with 1.1020% 6mol/l dilute hydrochloric acid at 100 ℃, then performing flowing washing work, and washing the acid-washed activated carbon with the alkaline compound until the pH value of the activated carbon is neutral;
and S5, taking out the washed activated carbon particles, drying, carrying out air separation on the dried activated carbon, and selecting activated carbon particles with proper sizes to meet the requirement of spraying the activated carbon particles by a nozzle.
The active carbon is used for adsorbing dioxin in incineration flue gas, the pore size of micropores of the active carbon per se needs to be controlled, the pore size of the active carbon is used for adsorbing the dioxin, the catalyst comprises one or more of sodium carbonate, ammonium carbonate, potassium carbonate and ferric nitrate, and the catalyst reacts with coal powder, coal tar and water in a mixing manner, so that the pore size of the micropores is influenced.
The alkaline compound is one or more of potassium hydroxide, sodium hydroxide and calcium hydroxide, and is used for neutralizing the acidic compound.
And washing the activated carbon by using the alkaline compound and then washing the activated carbon by using purified water until no residue is left.
The active carbon is easy to react with air to form other compounds in the cooling process, the inert gas is nitrogen, and the purity of the active carbon is ensured by isolating the reaction between the active carbon and the air by the nitrogen.
The device for grinding and crushing comprises a machine body 21, wherein a working cavity 24 which penetrates upwards is arranged in the machine body 21, a sealing cover 11 which is detachably connected is arranged on the machine body 21, the sealing cover 11 and the machine body 21 can be separated, the interior of the working cavity 24 can be treated after separation, a motor 43 is fixedly arranged on the side wall of the working cavity 24, a grinding device for crushing active carbon is connected to an output shaft of the motor 43, the grinding device is driven to work by the motor 43, a rotating shaft 42 is rotatably arranged on the side wall of the working cavity 24 along the axial direction of the output shaft of the motor 43, the rotating shaft 42 is connected with the grinding device, and the rotating shaft 42 is matched with the output shaft of the motor 43; be equipped with in the organism 21 and arrange material pipe 23, it runs through to arrange material pipe 23 one end organism 21 has the opening, arrange the material pipe 23 other end and stretch into 24 diapalls of working chamber, arrange material pipe 23 in 24 in-connection in the working chamber have funnel 51, funnel 51 is located the grinder below, through funnel 51 collects the work, and passes through arrange material pipe 23 discharge organism 21 to conveniently collect the work.
The grinding device is used for grinding the active carbon, the grinding device comprises a grinding block 41, the grinding block 41 is connected with the rotating shaft 42 and the motor 43, the grinding block 41 is driven to rotate by the motor 43, a grinding cavity 45 is arranged in the grinding block 41, the grinding cavity 45 is spherical, the grinding block 41 is provided with a through hole 46 which penetrates through along the radial direction of the rotating shaft 42, the through hole 46 is used for putting and discharging activated carbon, the through hole 46 is positioned right above the center of the grinding block 41, a rolling ball 47 is arranged in the grinding cavity 45, the rolling ball 47 is made of high-quality and high-density materials, the diameter of the rolling ball 47 is larger than that of the through hole 46, the diameter of the rolling ball 47 is smaller than that of the grinding cavity 45, the grinding block 41 is driven by the motor 43 to rotate normally alternately, thereby providing acceleration to the ball 47, causing the ball 47 to actively squeeze the activated carbon.
As shown in fig. 5, the through hole 46 is an inverted cone, so that the activated carbon can be conveniently put into the through hole, the grinding block 41 is provided with a filtering hole 44 at the through hole 46, the filtering hole 44 is circumferentially distributed around the through hole 46, the diameter of the filtering hole 44 is smaller than that of the through hole 46, so that the activated carbon can enter the filtering hole without interference, when the activated carbon powder needs to be discharged, the grinding block 41 is rotated to enable the through hole 46 to be vertically downward, and the rolling ball 47 blocks the through hole, so that the activated carbon is discharged from the filtering hole 44.
And the grinding block 41 can leak part of activated carbon with larger particles from the through hole 46 in the swinging and rotating process, the funnel 51 contains not only activated carbon powder but also larger particles, the funnel 51 contains the grinding ball 54, the diameter of the grinding ball 54 is larger than the diameter of the outlet at the lower end of the funnel 51, the activated carbon in the funnel 51 is ground through the grinding ball 54, the hydraulic rod 53 extends upwards, when the through hole 46 of the grinding block 41 faces upwards, the grinding block 41 is in rolling fit with the grinding ball 54, the grinding block 41 is in a spherical shape, and the grinding block 41 is abutted to the grinding ball 54, so that the grinding block 41 drives the grinding ball 54 to roll in the rotating process, and the activated carbon is ground.
11 up end of sealed lid is equipped with fan 12, be connected with charge-in pipeline 13 on the fan 12, charge-in pipeline 13 lower extreme runs through sealed lid 11, charge-in pipeline 13 upper end is stretched out fan 12 is used for toward organism 21 puts in the active carbon, the active carbon granule that funnel 51 was collected is not of uniform size, generally needs to grind many times, arrange fixedly connected with back flow 22 on the material pipe 23, back flow 22 is fixed in on the outer wall of organism 21, back flow 22 with sealed lid 11 can dismantle the connection, fan 12 during operation, it is sealed to arrange material pipe 23 export, fan 12 will active carbon in the back flow 22 is taken out, will the active carbon of back flow 22 bottom is taken out to the top and is followed active carbon charge-in pipeline 13 puts in the working chamber 24.
Working state
The sealing cover 11 is arranged at the upper end of the machine body 21, the return pipe 22 is connected with the fan 12, the through hole 46 of the grinding block 41 faces upwards, the feeding pipeline 13 is positioned above the through hole 46, and the outlet of the discharging pipe 23 is sealed. The hydraulic rod 53 is started, the hydraulic rod 53 drives the funnel 51 to move upwards, the funnel 51 drives the grinding ball 54 to move upwards, and the grinding ball 54 is abutted against the lower end of the grinding block 41. The activated carbon is put in from the feeding pipeline 13, falls into the grinding cavity 45 through the feeding pipeline 13, the motor 43 is started, the motor 43 rotates forwards and backwards alternately, the rotating angle is smaller than 90 degrees, the output shaft of the motor 43 drives the grinding block 41 to rotate forwards and backwards alternately, the rolling ball 47 swings under the action of the grinding block 41 through inertia, and the rolling ball 47 moves in the grinding cavity 45 in a reciprocating mode and extrudes the activated carbon. The grinding block 41 rotates to drive the grinding balls 54 to roll in the funnel 51, and the grinding balls 54 grind the activated carbon falling on the inner circumferential surface of the funnel 51. After the motor 43 rotates forward and backward for N times alternately, the motor 43 rotates 180 degrees to enable the opening of the through hole 46 of the grinding cavity 45 to face downwards, the motor 43 reduces the rotating speed and continues to rotate forward and backward alternately, the rotating angle is smaller than 90 degrees, at the moment, the through hole is blocked by the rolling ball 47, and the activated carbon powder can only fall into the funnel 51 from the filtering hole 44. The motor 43 and the funnel 51 return to the initial state, the grinding block 41 abuts against the grinding ball 54, the activated carbon powder in the funnel 51 falls into the return pipe 22 through the telescopic pipe 52, the fan 12 works, the activated carbon powder below the return pipe 22 moves to the fan 12, and the fan 12 blows the activated carbon to fall into the grinding cavity 45 again through the feeding pipeline 13. After repeating the operation for a plurality of times, the motor 43 is operated to make the through hole 46 of the grinding block 41 open downwards, the funnel 51 moves downwards, the fan 12 is closed, the discharge pipe 23 is opened, and the activated carbon particles are discharged from the discharge pipe 23.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A preparation method of activated carbon for adsorbing dioxin in waste incineration flue gas is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing the coal powder, water, the catalyst and the coal tar, and stirring to form coal particles;
s2, putting the coal particles into a furnace for heating and drying to form activated carbon;
s3, putting the activated carbon into inert gas, cooling, and grinding and crushing the activated carbon;
s4, sequentially putting the crushed activated carbon particles into an acidic compound and a basic compound, and washing;
and S5, taking out the washed activated carbon particles, and performing air separation.
2. The method for preparing activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 1, characterized in that: the pulverized coal includes one or more of anthracite, lean coal and weakly caking coal.
3. The method for preparing activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 1, characterized in that: the device for grinding and crushing the activated carbon in the step S3 comprises a machine body (21), wherein a working cavity (24) which penetrates upwards is formed in the machine body (21), a sealing cover (11) which is detachably connected is mounted on the machine body (21), a motor (43) is mounted on the side wall of the working cavity (24), a grinding device for crushing the activated carbon is connected to an output shaft of the motor (43), a rotating shaft (42) is rotatably mounted on the side wall of the working cavity (24) along the axial direction of the output shaft of the motor (43), and the rotating shaft (42) is connected with the grinding device; be equipped with in organism (21) and arrange material pipe (23) back flow (22), it runs through to arrange material pipe (23) one end organism (21), it stretches into to arrange material pipe (23) other end working chamber (24) diapire, arrange material pipe (23) in working chamber (24) in-connection has funnel (51), funnel (51) are located grinder below.
4. The activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 3, characterized in that: the grinding device comprises a grinding block (41), the grinding block (41) is connected with a rotating shaft (42) and a motor (43), a grinding cavity (45) is arranged in the grinding block (41), the grinding block (41) is provided with a through hole (46) which radially penetrates through the rotating shaft (42), a rolling ball (47) is arranged in the grinding cavity (45), and the diameter of the rolling ball (47) is larger than that of the through hole (46).
5. The activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 4, characterized in that: the grinding block (41) is provided with a filtering hole (44) at the through hole (46), and the diameter of the filtering hole (44) is smaller than that of the through hole (46).
6. The activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 3, characterized in that: fixed connection's hydraulic stem (53) are installed to working chamber (24) diapire, hydraulic stem (53) with funnel (51) outer wall connection, funnel (51) lower extreme fixedly connected with is flexible pipe (52), flexible pipe (52) with row material pipe (23) are connected.
7. The activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 3, characterized in that: grinding ball (54) has been placed in funnel (51), grinding ball (54) diameter is greater than funnel (51) lower extreme export diameter, hydraulic stem (53) upwards stretch out, grinding block (41) through-hole (46) when towards the top, grinding block (41) with grinding ball (54) roll cooperation.
8. The activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 3, characterized in that: sealed lid (11) up end is equipped with fan (12), arrange fixedly connected with back flow (22) on material pipe (23), back flow (22) with fan (12) can be dismantled the connection, be connected with charge-in pipeline (13) on fan (12), charge-in pipeline (13) lower extreme runs through sealed lid (11), charge-in pipeline (13) upper end is stretched out fan (12).
9. The method for preparing activated carbon for adsorbing dioxin in waste incineration flue gas according to claim 1, characterized in that: the alkaline compound is one or more of potassium hydroxide, sodium hydroxide and calcium hydroxide, the alkaline compound is used for neutralizing the acidic compound, and the activated carbon is washed by the alkaline compound and then washed by purified water until no residue is left.
10. An activated carbon obtained by the production method according to any one of claims 1 to 9, characterized in that: the activated carbon is used for adsorbing dioxin in waste incineration flue gas.
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| CN202111281920.1A CN113813920B (en) | 2021-11-01 | 2021-11-01 | Activated carbon for adsorbing dioxin in waste incineration flue gas and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106938846A (en) * | 2017-01-18 | 2017-07-11 | 广东韩研活性炭制造有限公司 | A kind of activated carbon adsorbed for waste incineration dioxin in flue gas and preparation method thereof |
| WO2017212827A1 (en) * | 2016-06-09 | 2017-12-14 | 花王株式会社 | Detergent composition for hard disk substrates |
| CN108404863A (en) * | 2018-04-04 | 2018-08-17 | 成都达奇环境科技有限公司 | A kind of activated carbon and preparation method thereof for Xi Fu bioxin |
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- 2021-11-01 CN CN202111281920.1A patent/CN113813920B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017212827A1 (en) * | 2016-06-09 | 2017-12-14 | 花王株式会社 | Detergent composition for hard disk substrates |
| CN106938846A (en) * | 2017-01-18 | 2017-07-11 | 广东韩研活性炭制造有限公司 | A kind of activated carbon adsorbed for waste incineration dioxin in flue gas and preparation method thereof |
| CN108404863A (en) * | 2018-04-04 | 2018-08-17 | 成都达奇环境科技有限公司 | A kind of activated carbon and preparation method thereof for Xi Fu bioxin |
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