CN112495381A - Preparation method for improving denitration performance of regenerated particle activated coke - Google Patents
Preparation method for improving denitration performance of regenerated particle activated coke Download PDFInfo
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- 239000000571 coke Substances 0.000 title claims abstract description 104
- 239000002245 particle Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 37
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 27
- 238000001994 activation Methods 0.000 claims abstract description 26
- 230000004913 activation Effects 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 238000003763 carbonization Methods 0.000 claims abstract description 24
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 17
- 239000005539 carbonized material Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000004898 kneading Methods 0.000 claims abstract description 15
- 239000010419 fine particle Substances 0.000 claims abstract description 14
- 239000011362 coarse particle Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000007885 magnetic separation Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 239000000446 fuel Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 6
- 239000006148 magnetic separator Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 4
- 241000219793 Trifolium Species 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000012216 screening Methods 0.000 abstract description 11
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000010426 asphalt Substances 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000010000 carbonizing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 210000002257 embryonic structure Anatomy 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/745—Iron
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/04—Mixing
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/084—Decomposition of carbon-containing compounds into carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
- B01D2255/702—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
- B01D2255/707—Additives or dopants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/92—Dimensions
- B01D2255/9202—Linear dimensions
-
- 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
Abstract
The invention relates to the technical field of solid waste treatment and recycling, and discloses a preparation method for improving denitration performance of regenerated granular active coke, which comprises the following steps: s1: screening waste coke powder particles, grinding the obtained coarse particles into fine powder, separating active heavy metals such as iron-containing oxides and the like from the obtained fine particles through magnetic separation, and using the residual particles as fuel for blending combustion; s2: mixing and kneading the fine powder, the iron-containing oxide and other active heavy metals and some forming aids to obtain pug, and then sending the pug into an extruder to obtain granular active coke wet blanks; s3: and drying the wet embryo to obtain an active coke dry embryo, then adding the active coke dry embryo into a carbonization furnace for carbonization to prepare a carbonized material, then adding the carbonized material into an activation furnace for activation under the steam atmosphere, and discharging the cooled carbonized material to obtain a finished product. The regenerated granular active coke obtained by the method has wide raw material source and low cost, the strength and the wear resistance of the active coke are obviously improved, and the denitration performance is improved to more than 50%.
Description
Technical Field
The invention relates to the technical field of solid waste treatment and recycling, and discloses a preparation method for improving denitration performance of regenerated granular active coke.
Background
In recent years, the active coke desulfurization and denitrification technology is widely applied to large-scale factory enterprises such as steel plants, power plants and the like, and has the advantages of no secondary pollution, recyclable adsorbent, high removal efficiency and the like, but due to the limitation of the existing technology, active coke generates a large amount of abrasion consumption during the operation period, the abraded and broken active coke powder adsorbs a small amount of heavy metals, a small amount of sulfate and the like, the powder is explosive, and long-distance transprovincial transportation treatment is limited, so the treatment technology of taking the active coke powder (fine particles) with high specific surface area as fuel to burn is mainly adopted in China at present, which not only causes huge cost waste and energy consumption, but also directly discharges the adsorbed pollutants into flue gas after burning, and increases the load of subsequent flue gas purification treatment and the circulation amount of the active coke. Therefore, the development of the secondary forming, activating and recycling technology of the active coke powder is significant.
The active coke denitration principle is that some active groups, heavy metals and the like contained on the surface of coke react with nitric oxide under the action of ammonia gas so as to remove the nitric oxide in flue gas, but the active coke denitration efficiency is generally about 30% and cannot be improved all the time at present, so that the downstream denitration problem needs to be considered by a manufacturer. How to improve the denitration efficiency of the activated coke is the key point of the current domestic and foreign research.
The Chinese patent document application No. 202010342333.8 discloses a one-step preparation device and method for desulfurization and denitrification coal-based activated coke, which is characterized in that raw coal with the particle size of 4-15 mm is used as a raw material and sent into a coke oven to be carbonized, generated coal gas heats steam of an activation section to 800-900 ℃ to provide coke activation temperature, the prepared activated coke keeps the medium-large pore structure of the raw coal, the desulfurization and denitrification performance is superior to that of commercial activated coke, but the performance is actually improved to a limited extent, the abrasion and regeneration of the activated coke are not considered, the demand on the raw coal is large, and the cost is high.
Chinese patent document No. 201611116539.9 discloses an active coke preparation apparatus and method, which is characterized in that a combustion section in a circulating fluidized bed provides high-temperature flue gas required by a coke making section, and a gas-solid separation device is used to separate an active coke finished product, thereby achieving the purpose of integrally preparing active coke by the same apparatus, but the technology does not solve the problem of low denitration rate of active coke.
A nano V is disclosed in Chinese patent document No. 201210283650.22O5The active coke denitration catalyst is characterized by comprising 0.5-10 wt% of Fe2O3Preparing ferric nitrate solution and mixing at 0.5-10 wt% V2O5Preparation of Nano V2O5Solution is respectively dipped and loaded on the cylindrical active coke at room temperature to prepare V2O5The active coke denitration catalyst has good denitration activity under dry flue gas, but the actual flue gas of engineering contains a certain amount of water vapor, so that the influence on the denitration performance of the catalyst is large, the demand of patent 201210283650.2 on active metals such as formed granular active coke, vanadium and the like is large, and the preparation cost is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method for improving the denitration performance of regenerated granular active coke, which comprises the steps of dividing waste coke powder into coarse particles and fine particles by screening, grinding the coarse particles into fine powder as a raw material, separating active heavy metals such as iron-containing oxides from the fine particles by magnetic separation, adding the fine particles into the fine powder to improve the content of the active metals in the waste coke powder, enhancing the low-temperature denitration activity, adding forming auxiliaries such as a carburant and a binder, mixing and kneading to obtain pug, feeding the pug into a high-pressure extruder for forming, and preparing the regenerated granular active coke by a series of procedures such as drying, carbonization and activation, so that the strength and the wear resistance of the active coke can be obviously improved, and the denitration efficiency of the regenerated active coke particles can be obviously improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, raw material pretreatment line: feeding the waste coke powder particles into a screening machine through a first feeding device for screening, feeding the obtained coarse particles into a grinding machine in a pneumatic conveying mode for further crushing and grinding into fine powder, feeding the obtained fine particles into a magnetic separator for separating active heavy metals such as iron-containing oxides and the like through magnetic separation, and taking the residual particles as fuel for blending combustion;
s2, an active coke production line:
(1) mixing and kneading: adding the fine powder and the iron-containing oxide and other active heavy metals into a mixer through a second feeding device, and fully mixing and kneading the fine powder and the iron-containing oxide and other active heavy metals with a forming auxiliary agent such as a carburant, a binder and the like to obtain pug;
(2) molding and granulating, namely feeding the pug into an extruder to obtain granular active coke wet blanks;
s3, kiln control line:
(1) and (3) drying: conveying the wet embryo to a drying kiln through a belt for drying to obtain an active coke dry embryo;
(2) carbonization and activation: and adding the active coke dry blank into a carbonization furnace for carbonization to prepare a carbonized material, adding the carbonized material into an activation furnace for activation in a steam atmosphere, cooling and discharging to obtain a finished product.
Preferably, the waste coke powder particles in the step S1 are activated coke particles with the particle size less than 5mm, the coarse particles are activated coke particles with the particle size of 0.1-5 mm, and the fine particles are activated coke particles with the particle size less than 0.1 mm;
preferably, the carburant in step S2 is asphalt, and the binder is organic substance, inorganic substance or a mixture of organic substance and inorganic substance, such as tar, tar and water;
preferably, the material mixing time in the step S2 is 2-4 h;
preferably, the mass of the active heavy metal such as iron-containing oxide added in the step S2 accounts for 3.5-5% of the total mass of the fine powder;
preferably, the granular active coke in step S2 is cylindrical, clover or the like, and has a cross-section circumscribed circle with a diameter of 8-12 mm and a length of 5-12 mm;
preferably, the stacking height of the wet embryos in the step S3 is not more than 15 cm;
preferably, the drying temperature in the step S3 is 120-180 ℃;
preferably, in the step S3, the carbonization temperature is 600-800 ℃, the carbonization time is 1-3 h, the activation temperature is 800-1200 ℃, the water vapor pressure is 0.2-0.6 MPa, and the activation time is 4-24 h.
The denitration performance of the regenerated granular active coke obtained by the preparation method for improving the denitration performance of the regenerated granular active coke is improved to more than 50%.
The invention has the beneficial effects that:
1. the preparation method for improving the denitration performance of the regenerated granular active coke comprises the steps of dividing waste coke powder into coarse granules and fine granules by screening, grinding the coarse granules into fine powder serving as a raw material, separating active heavy metals such as iron-containing oxides from the fine granules by magnetic separation, adding the fine powder into the fine powder to improve the content of the active metals in the waste coke powder, adding forming aids such as a carburant and a binder, mixing and kneading to obtain pug, and the like to prepare the regenerated granular active coke, so that the surface pore structure and the functional group of the active coke are improved, the specific surface area is increased, and the low-temperature denitration activity of the regenerated granular active coke is obviously enhanced.
2. According to the preparation method for improving the denitration performance of the regenerated granular active coke, the regenerated granular active coke is prepared by adopting the high-pressure extruder, so that the density of the active coke is improved, the stacking weight of the active coke under the same volume is increased, the strength and the wear resistance of the active coke are further improved, and the service life is prolonged.
3. The preparation method for improving the denitration performance of the regenerated granular active coke adopts the active coke granules which can not be directly reused after desulfurization and denitration as the raw materials, has low cost and wide sources, greatly reduces the pollution during the incineration treatment of the waste coke powder, realizes the self-recycling of resources and has great social and economic benefits.
Drawings
The embodiments of the present invention will be described in detail with reference to the following drawings for those skilled in the art to understand and read, but the embodiments are only a part of the best embodiments, and the scope of the present invention is not limited thereto:
FIG. 1 is a process flow chart of the preparation method for improving the denitration performance of the regenerated granular activated coke.
Detailed Description
As shown in fig. 1, the preparation method for improving denitration performance of regenerated granular activated coke provided by the invention is characterized by comprising the following steps:
a preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, raw material pretreatment line: feeding the waste coke powder particles into a sieving machine through a first feeding device for sieving, and feeding the obtained coarse particles into a grinding machine in a pneumatic conveying mode for further grinding into fine powder; the obtained fine particles are sent into a magnetic separator to separate the active heavy metals such as iron-containing oxides and the like through magnetic separation, and the residual particles are used as fuel for blending combustion;
the waste coke powder particles are active coke particles with the particle size of less than 5mm, and can not be added into active coke desulfurization and denitrification equipment for recycling, the crushing amount of the waste coke powder particles generally accounts for about 30-50% of the whole addition amount, and in severe cases accounts for about 60-70%, wherein the coarse particles are active coke particles with the particle size of 0.1-5 mm, the fine particles are active coke particles with the particle size of less than 0.1mm, and the particle size of the fine powder is less than 200 meshes;
s2, an active coke production line:
(1) mixing and kneading: adding the fine powder and the iron-containing oxide and other active heavy metals into a mixer through a second feeding device, and fully mixing and kneading the fine powder and the iron-containing oxide and other active heavy metals with a forming auxiliary agent such as a carburant, a binder and the like to obtain pug;
wherein the carburant is asphalt, and the binder is organic substance, inorganic substance or mixture of organic substance and inorganic substance, such as tar, tar and water; the material mixing time is 2-4 h; adding active heavy metals such as iron-containing oxides with the mass concentration of 3.5-5% into the fine powder, and performing denitration together with the original active heavy metals such as iron-containing oxides with the mass concentration of 5% in the fine powder;
(2) molding and granulating, namely feeding the pug into an extruder to obtain granular active coke wet blanks;
the extruder is a high-pressure extrusion forming machine with the pressure of 5-50 MPa, such as a spiral conveyor, a pair-roller forming granulator and the like, and the density of the active coke is provided through high pressure; the granular active coke is cylindrical, clover and the like, the diameter of a circumscribed circle of the section is 8-12 mm, the length is 5-12 mm, and the performance of the catalyst is most excellent within the specification range;
s3, kiln control line:
(1) and (3) drying: conveying the wet embryo to a drying kiln through a belt for drying to obtain an active coke dry embryo;
wherein the stacking height of the wet embryo is not more than 15cm, which is beneficial to drying the active coke; the drying temperature is 120-180 ℃;
(2) carbonization and activation: and adding the active coke dry blank into a carbonization furnace for carbonization to prepare a carbonized material, adding the carbonized material into an activation furnace for activation in a steam atmosphere, cooling and discharging to obtain a finished product.
Wherein the temperature of the carbonization furnace is 600-800 ℃, the carbonization time is 1-3 h, the activation temperature is 800-1200 ℃, the water vapor pressure is 0.2-0.6 MPa, and the activation time is 4-24 h.
The regenerated granular activated coke prepared by the method has good performance, and the denitration performance is improved to more than 50%.
The preparation method for improving the denitration performance of the regenerated particle activated coke according to the invention is further described below by combining specific examples.
Example 1
A preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, pretreatment of raw materials: feeding waste coke powder particles smaller than 5mm into a screening machine through a first feeding device for screening, feeding obtained 0.1-5 mm coarse particles into a grinding machine in a pneumatic conveying mode for further grinding into fine powder with the particle size of 200 meshes, feeding obtained fine particles smaller than 0.1mm into a magnetic separator for separating active heavy metals such as iron-containing oxides and the like through magnetic separation, and taking the residual particles as fuel for blending combustion;
s2, mixing and kneading: weighing a certain amount of fine powder, adding 3.5% of active heavy metal such as iron-containing oxide and the like, feeding the fine powder into a mixer, reacting with the original 5% of active heavy metal such as iron-containing oxide and the like contained in the fine powder, and fully mixing and kneading the fine powder and forming aids such as carburant asphalt, binder tar and the like for 2 hours to obtain pug;
s3, forming and granulating, namely feeding the pug into a screw conveying extruder with the pressure of 10MPa to obtain granular active coke wet blanks with the section diameter of 8mm and the length of 10 mm;
s4, drying: conveying the wet embryo into a drying kiln through a belt for drying to obtain an active coke dry embryo, wherein the stacking height of the wet embryo is 15cm, and the drying temperature is 150 ℃;
s5, carbonization and activation: and (3) adding the active coke dry blank into a carbonization furnace, carbonizing for 1h at 600 ℃ to prepare a carbonized material, adding the carbonized material into an activation furnace at 800 ℃ to activate for 4h under the water vapor atmosphere of 0.2MPa, cooling and discharging to obtain a finished product.
The regenerated granular activated coke prepared by the method has good performance, and the denitration performance reaches 52.5% under the conditions of 135 ℃ and 15% of water vapor.
Example 2
A preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, pretreatment of raw materials: feeding waste coke powder particles smaller than 5mm into a screening machine for screening, feeding the obtained coarse particles of 0.1-5 mm into a grinding machine in a pneumatic conveying mode for further grinding into fine powder with the particle size of 300 meshes, feeding the obtained fine particles smaller than 0.1mm into a magnetic separator for separating active heavy metals such as iron-containing oxides and the like through magnetic separation, and taking the rest particles as fuel for blending combustion;
s2, mixing and kneading: weighing a certain amount of fine powder, adding 4% of active heavy metal such as iron-containing oxide and the like, feeding the fine powder into a mixer, reacting with the original 5% of active heavy metal such as iron-containing oxide and the like contained in the fine powder, and fully mixing and kneading the fine powder with forming aids such as a mixture of carburant asphalt, binder tar and water for 3 hours to obtain pug;
s3, forming and granulating, namely feeding the pug into a screw conveying extruder with the pressure of 20MPa to obtain granular active coke wet blanks with the section diameter of 9mm and the length of 10 mm;
s4, drying: conveying the wet embryo into a drying kiln through a belt for drying to obtain an active coke dry embryo, wherein the stacking height of the wet embryo is 15cm, and the drying temperature is 160 ℃;
s5, carbonization and activation: and (3) adding the active coke dry blank into a carbonization furnace, carbonizing for 1.5h at 720 ℃ to prepare a carbonized material, adding the carbonized material into a 950 ℃ activation furnace, activating for 12h under the water vapor atmosphere of 0.4MPa, cooling and discharging to obtain a finished product.
The regenerated granular activated coke prepared by the method has good performance, and the denitration performance reaches 54.5% under the condition of water vapor with the concentration of 12% at the temperature of 140 ℃.
Example 3
A preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, pretreatment of raw materials: feeding waste coke powder particles smaller than 5mm into a screening machine for screening, feeding the obtained coarse particles of 0.1-5 mm into a grinding machine in a pneumatic conveying mode for further grinding into fine powder with the particle size of 400 meshes, feeding the obtained fine particles smaller than 0.1mm into a magnetic separator for separating active heavy metals such as iron-containing oxides and the like through magnetic separation, and taking the rest particles as fuel for blending combustion;
s2, mixing and kneading: weighing a certain amount of fine powder, adding 5% of active heavy metal such as iron-containing oxide and the like, feeding the fine powder into a mixer, reacting with the original 5% of active heavy metal such as iron-containing oxide and the like contained in the fine powder, and fully mixing and kneading the fine powder with forming aids such as a mixture of carburant asphalt, binder tar and water for 3 hours to obtain pug;
s3, forming and granulating, namely feeding the pug into a pair-roller forming granulator with the pressure of 50MPa to obtain granular active coke wet blanks with the section diameter of 9mm and the length of 8 mm;
s4, drying: conveying the wet embryo into a drying kiln through a belt for drying to obtain an active coke dry embryo, wherein the stacking height of the wet embryo is 12cm, and the drying temperature is 160 ℃;
s5, carbonization and activation: and (3) adding the active coke dry blank into a carbonization furnace, carbonizing for 3h at 800 ℃ to prepare a carbonized material, adding the carbonized material into an activation furnace at 1000 ℃ to activate for 24h under the atmosphere of 0.6MPa of water vapor, cooling and discharging to obtain a finished product.
The regenerated granular activated coke prepared by the method has good performance, and the denitration performance can reach 55.0% under the condition of water vapor with the concentration of 15% at 135 ℃.
Claims (9)
1. A preparation method for improving denitration performance of regenerated granular activated coke is characterized by comprising the following steps:
s1, raw material pretreatment line: feeding the waste coke powder particles into a sieving machine through a first feeding device for sieving, and feeding the obtained coarse particles into a grinding machine in a pneumatic conveying mode for further grinding into fine powder; the obtained fine particles are sent into a magnetic separator to separate the active heavy metals such as iron-containing oxides and the like through magnetic separation, and the residual particles are used as fuel for blending combustion;
s2, an active coke production line:
(1) mixing and kneading: adding the fine powder and the separated active heavy metal such as iron-containing oxide into a mixer through a second feeding device, and fully mixing and kneading the fine powder and the separated active heavy metal with forming aids such as a carburant, a binder and the like to obtain pug;
(2) molding and granulating, namely feeding the pug into an extruder to obtain granular active coke wet blanks;
s3, kiln control line:
(1) and (3) drying: conveying the wet embryo to a drying kiln through a belt for drying to obtain an active coke dry embryo;
(2) carbonization and activation: and adding the active coke dry blank into a carbonization furnace for carbonization to prepare a carbonized material, adding the carbonized material into an activation furnace for activation in a steam atmosphere, cooling and discharging to obtain a finished product.
2. The preparation method of claim 1, wherein the waste coke breeze particles in the step S1 are activated coke particles with a size of less than 5mm, the coarse particles are activated coke particles with a size of 0.1-5 mm, and the fine particles are activated coke particles with a size of less than 0.1 mm.
3. The method of claim 1, wherein the recarburizing agent in S2 is pitch, and the binder is organic substance, inorganic substance or a mixture of organic substance and inorganic substance, such as tar, tar and water.
4. The preparation method for improving the denitration performance of the regenerated granular activated coke as claimed in claim 1, wherein the mixing time in S2 is 2-4 h.
5. The preparation method for improving the denitration performance of the regenerated granular activated coke as claimed in claim 1, wherein the mass of the added active heavy metals such as iron-containing oxides in S2 accounts for 3.5-5% of the total mass of the fine powder.
6. The preparation method for improving denitration performance of regenerated granular activated coke according to claim 1, wherein the granular activated coke in S2 is cylindrical, clover and the like, and has a cross section circumscribed circle diameter of 8-12 mm and a length of 5-12 mm.
7. The preparation method of improving denitration performance of regenerated particle activated coke as claimed in claim 1, wherein the stacking height of said wet embryo in S3 should not exceed 15 cm.
8. The preparation method for improving denitration performance of regenerated granular activated coke as claimed in claim 1, wherein the drying temperature in S3 is 120-180 ℃.
9. The preparation method for improving the denitration performance of the regenerated particle activated coke according to claim 1, wherein the carbonization temperature in S3 is 600-800 ℃, the carbonization time is 1-3 h, the activation temperature is 800-1200 ℃, the steam pressure is 0.2-0.6 MPa, and the activation time is 4-24 h.
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