CN116875336A - Pyrolysis reaction method for waste tires - Google Patents
Pyrolysis reaction method for waste tires Download PDFInfo
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- CN116875336A CN116875336A CN202310909601.3A CN202310909601A CN116875336A CN 116875336 A CN116875336 A CN 116875336A CN 202310909601 A CN202310909601 A CN 202310909601A CN 116875336 A CN116875336 A CN 116875336A
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 65
- 239000010920 waste tyre Substances 0.000 title claims abstract description 43
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000243 solution Substances 0.000 claims abstract description 37
- 239000012670 alkaline solution Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000006229 carbon black Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 73
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- 238000010008 shearing Methods 0.000 claims description 25
- 238000002076 thermal analysis method Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 claims description 14
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 13
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 150000001768 cations Chemical class 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910001414 potassium ion Inorganic materials 0.000 claims description 9
- 229910001415 sodium ion Inorganic materials 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 238000005491 wire drawing Methods 0.000 claims description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 239000010806 kitchen waste Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000011593 sulfur Substances 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 238000009987 spinning Methods 0.000 abstract 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/005—After-treatment of coke, e.g. calcination desulfurization
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
Abstract
The invention discloses a pyrolysis reaction method of junked tires, which comprises the following steps: step one: waste tires firstly enter a spinning unit for spinning; step two: putting the waste tires subjected to filament drawing into a crushing unit for crushing; step three: adding the crushed junked tires into a pyrolysis processor for pyrolysis treatment; step four: carrying out gas-liquid reaction on pyrolysis gas generated by pyrolysis of waste tires to finally obtain sulfite solution and elemental sulfur; step five: conveying solid slag generated by pyrolysis of waste tires into a discharging unit, wherein the discharging unit is communicated with a collecting unit, and the collecting unit is used for collecting and treating carbon black; step six: the carbon black primary material and the desulfurizing agent are mixed according to the mass ratio and then cooled to normal temperature to obtain the finished carbon black, and the first alkaline solution and the second alkaline solution are utilized to effectively purify sulfur in pyrolysis gas and recycle elemental sulfur, so that the problem of recycling pyrolysis gas generated by waste tires can be effectively solved.
Description
Technical Field
The invention relates to the technical field of pyrolysis of junked tires, in particular to a pyrolysis reaction method of junked tires.
Background
With the rapid development of the economy in China and the general improvement of the living standard of people, automobiles gradually enter the daily life of people, and a large number of waste tires are generated. The accumulation of a large number of junked tires not only occupies land, but also is easy to breed mosquito bacteria, spread diseases and harm the health of residents, and is extremely easy to cause fire and cause environmental pollution. The waste tires are recycled, so that the pressure of the waste tires on the environment can be relieved, pollution is reduced, and effective recycling of resources can be realized.
The utilization mode of the junked tires generally comprises retreading, reclaimed rubber, rubber powder, heat energy utilization, pyrolysis and the like, wherein the pyrolysis method is considered as one of the best ways of treating the junked tires nowadays, and the junked tires can recycle pyrolysis gas, pyrolysis oil, solid carbon and the like through pyrolysis treatment. Pyrolysis gases produced by scrap tires during pyrolysis are typically used for direct combustion. However, since pyrolysis gas generated during pyrolysis of junked tires has a large amount of sulfur compounds (such as hydrogen sulfide and carbonyl sulfide), the pyrolysis gas generates a large amount of sulfur dioxide gas after combustion, which is unfavorable for purifying sulfur in flue gas, we propose a method for pyrolysis reaction of junked tires to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a pyrolysis reaction method for waste tires, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a pyrolysis reaction method of junked tires comprises the following steps:
step one: firstly, the waste tires enter a wire drawing unit, and iron wires in the waste tires are drawn out by the wire drawing unit;
step two: putting the waste tires subjected to filament drawing into a crushing unit for crushing, wherein the feeding crushing unit sequentially comprises a feeding bin, a crushing bin, a sealing bin and a distributing device which are communicated from top to bottom, and a discharge hole of the distributing device is connected with a feed inlet of a pyrolysis processor;
step three: adding the crushed junked tires into a pyrolysis processor, and carrying out pyrolysis treatment on the crushed junked tires through the pyrolysis processor;
step four: carrying out gas-liquid reaction on pyrolysis gas generated by pyrolysis of waste tires and a first alkaline solution to obtain a sulfide solution and a first mixed gas, burning the first mixed gas to obtain a second mixed gas, carrying out gas-liquid reaction on the second mixed gas and the second alkaline solution to obtain a bisulfite solution and a third mixed gas, removing sulfur dioxide in the third mixed gas, discharging, and mixing the sulfide solution and the bisulfite solution to obtain a sulfite solution and elemental sulfur;
step five: conveying solid slag generated by pyrolysis of waste tires into a discharge unit, wherein a water-cooling jacket is arranged on the discharge unit, the solid slag entering the discharge unit is cooled by the water-cooling jacket, the solid slag is cooled to 30-80 ℃, meanwhile, the discharge unit is communicated with a collecting unit, and the collecting unit is used for collecting and treating carbon black;
step six: mixing the carbon black primary material and the desulfurizing agent according to the mass ratio of 1-3:0.3-0.5, adjusting the temperature to 100-200 ℃ for 10-20s, and cooling to normal temperature to obtain the finished carbon black.
As a further scheme of the invention: the crushing bin is internally provided with a primary shearing type crushing structure, a star feeder and a secondary shearing type crushing mechanism from top to bottom in sequence, and after the waste tires enter the feeding bin, the waste tires are firstly sheared into blocks by the primary shearing type crushing structure, and then quantitatively fed into the secondary shearing type crushing structure by the star feeder, and crushed into 10-30mm particles, and then enter the sealing bin.
As a further scheme of the invention: the sealed bin is provided with a high-level material level gauge, a low-level material level gauge and an inert gas nozzle; the high and low level gauge ensures that materials are always piled in the sealed bin, thereby realizing material sealing; when the high material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are suspended, and when the low material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are started to continue feeding; when material accumulation and clamping occur in the sealed storage bin, inert gas is introduced into the sealed storage bin through an inert gas nozzle.
As a further scheme of the invention: the pyrolysis processor comprises a first thermal analysis section and a second thermal analysis section, wherein the first thermal analysis section is positioned obliquely above the second thermal analysis section, the first thermal analysis section is communicated with the second thermal analysis section through a blanking opening, the heat treatment temperature of the first thermal analysis section is 350-450 ℃, the heating rate is 0.5-2 ℃/min, and the heat treatment time is 1-3 hours; the heat treatment temperature of the second heat analysis section is 700-900 ℃, the heating rate is 2-5 ℃/min, and the heat treatment time is 1-3h.
As a further scheme of the invention: the pyrolysis gas comprises hydrogen sulfide, carbonyl sulfide, carbon dioxide and nitrogen, the metal cations in the first alkaline solution comprise sodium ions and/or potassium ions, and the first mixed gas comprises carbonyl sulfide, carbon dioxide and nitrogen; the second mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen; the metal cations in the second alkaline solution include sodium ions and/or potassium ions; the third mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen.
As a further scheme of the invention: removing sulfur dioxide in the third mixed gas and then discharging the sulfur dioxide, wherein the method comprises the following steps: carrying out gas-liquid reaction on the third mixed gas and the third alkaline solution to obtain sulfite solution and fourth mixed gas, and discharging the fourth mixed gas; wherein the metal cations in the third alkaline solution comprise sodium ions and/or potassium ions, and the fourth mixed gas comprises carbon dioxide and nitrogen.
As a further scheme of the invention: after the third mixed gas and the third alkaline solution are subjected to gas-liquid reaction, the method further comprises the following steps: and mixing the second alkaline solution with the sulfite solution obtained from the third mixed gas to obtain a first alkaline mixed solution, so that the second mixed gas and the first alkaline mixed solution are subjected to gas-liquid reaction to obtain the bisulfite solution.
As a further scheme of the invention: the desulfurizing agent in the step six is prepared by mixing N-methyldiethanolamine, rosin and kitchen waste grease at 80-100 ℃, placing the mixture in ultrasonic treatment, controlling the ultrasonic frequency to be 30-300Hz, treating for 1-3min, adding metal oxide into the mixture, and stirring for 10-30min at a stirring speed of 1000-3000 r/min.
As a further scheme of the invention: the frequency of the ultrasonic treatment is 200-300Hz.
As still further aspects of the invention: in the step six, after the carbon black primary material is mixed with the desulfurizing agent, the method also comprises the step of adopting ultrasonic frequency of 30-50Hz to treat for 10-30s.
Compared with the prior art, the invention has the beneficial effects that: according to the pyrolysis reaction of the waste tires, the pyrolysis gas generated by pyrolysis of the waste tires and the first alkaline solution are subjected to gas-liquid reaction to obtain sulfide solution and first mixed gas, the first mixed gas is combusted to obtain second mixed gas, the second mixed gas and the second alkaline solution are subjected to gas-liquid reaction to obtain bisulphite solution and third mixed gas, sulfur dioxide in the third mixed gas is removed and then discharged, the sulfide solution and the bisulphite solution are mixed to obtain sulfite solution and elemental sulfur, and the first alkaline solution and the second alkaline solution are utilized to effectively purify sulfur in the pyrolysis gas and recycle elemental sulfur, so that the problem of recycling the pyrolysis gas generated by the waste tires can be effectively solved.
The pyrolysis reaction of the waste tires can carry out pyrolysis treatment on the waste tires so as to recycle oil products, iron wires and carbon black with high added value, realize the recycling utilization of solid wastes, and have the advantages of high heat efficiency, low cost, environmental protection, no pollution and the like; the sulfur content of the prepared carbon black reaches below 0.1 percent by adding the desulfurizing agent in the process steps, the quality of the carbon black is improved, and the further application of the carbon black in the chemical industry field is promoted.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In one embodiment, as shown in fig. 1, a method for pyrolysis reaction of junked tires, comprises the steps of:
step one: firstly, the waste tires enter a wire drawing unit, and iron wires in the waste tires are drawn out by the wire drawing unit;
step two: putting the waste tires subjected to filament drawing into a crushing unit for crushing, wherein the feeding crushing unit sequentially comprises a feeding bin, a crushing bin, a sealing bin and a distributing device which are communicated from top to bottom, and a discharge hole of the distributing device is connected with a feed inlet of a pyrolysis processor;
step three: adding the crushed junked tires into a pyrolysis processor, and carrying out pyrolysis treatment on the crushed junked tires through the pyrolysis processor;
step four: carrying out gas-liquid reaction on pyrolysis gas generated by pyrolysis of waste tires and a first alkaline solution to obtain a sulfide solution and a first mixed gas, burning the first mixed gas to obtain a second mixed gas, carrying out gas-liquid reaction on the second mixed gas and the second alkaline solution to obtain a bisulfite solution and a third mixed gas, removing sulfur dioxide in the third mixed gas, discharging, and mixing the sulfide solution and the bisulfite solution to obtain a sulfite solution and elemental sulfur;
step five: conveying solid slag generated by pyrolysis of waste tires into a discharge unit, wherein a water-cooling jacket is arranged on the discharge unit, the solid slag entering the discharge unit is cooled by the water-cooling jacket, the solid slag is cooled to 30-80 ℃, meanwhile, the discharge unit is communicated with a collecting unit, and the collecting unit is used for collecting and treating carbon black;
step six: mixing the carbon black primary material and the desulfurizing agent according to the mass ratio of 1-3:0.3-0.5, adjusting the temperature to 100-200 ℃ for 10-20s, and cooling to normal temperature to obtain the finished carbon black.
The crushing bin is sequentially provided with a primary shearing type crushing structure, a star-shaped feeder and a secondary shearing type crushing mechanism from top to bottom, after the waste tires enter the feeding bin, the waste tires are firstly sheared into blocks by the primary shearing type crushing structure, and then quantitatively fed into the secondary shearing type crushing structure by the star-shaped feeder, and the waste tires are crushed into 10-30mm particles and enter the sealing bin;
the sealing bin is provided with a high-level material level gauge, a low-level material level gauge and an inert gas nozzle; the high and low level gauge ensures that materials are always piled in the sealed bin, thereby realizing material sealing; when the high material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are suspended, and when the low material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are started to continue feeding; when material accumulation and clamping occur in the sealed storage bin, introducing inert gas into the sealed storage bin through an inert gas nozzle;
the distributing device adopts a shear type distributing device, the shear type distributing device comprises a first rotating shaft and a second rotating shaft which are arranged in parallel, first blades are arranged on the first rotating shaft at intervals, second blades are arranged on the second rotating shaft at intervals, and the first blades and the second blades are arranged in a staggered mode;
the pyrolysis processor comprises a first thermal analysis section and a second thermal analysis section, the first thermal analysis section is positioned obliquely above the second thermal analysis section, the first thermal analysis section is communicated with the second thermal analysis section through a blanking opening, the heat treatment temperature of the first thermal analysis section is 350-450 ℃, the heating rate is 0.5-2 ℃/min, and the heat treatment time is 1-3 hours; the heat treatment temperature of the second heat analysis section is 700-900 ℃, the heating rate is 2-5 ℃/min, and the heat treatment time is 1-3h;
the pyrolysis gas comprises hydrogen sulfide, carbonyl sulfide, carbon dioxide and nitrogen, the metal cations in the first alkaline solution comprise sodium ions and/or potassium ions, and the first mixed gas comprises carbonyl sulfide, carbon dioxide and nitrogen; the second mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen; the metal cations in the second alkaline solution include sodium ions and/or potassium ions; the third mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen;
removing sulfur dioxide in the third mixed gas and then discharging, wherein the method comprises the following steps of: carrying out gas-liquid reaction on the third mixed gas and the third alkaline solution to obtain sulfite solution and fourth mixed gas, and discharging the fourth mixed gas; wherein, the metal cations in the third alkaline solution comprise sodium ions and/or potassium ions, and the fourth mixed gas comprises carbon dioxide and nitrogen;
after the third mixed gas and the third alkaline solution are subjected to gas-liquid reaction, the method further comprises the following steps: mixing the second alkaline solution with the sulfite solution obtained from the third mixed gas to obtain a first alkaline mixed solution, so that the second mixed gas and the first alkaline mixed solution perform gas-liquid reaction and a bisulfite solution is obtained;
after mixing the sulfide solution and the bisulfite solution, further comprising: mixing a second alkaline solution with a sulfite solution obtained from the sulfide solution to obtain a second alkaline mixed solution, so that a second mixed gas and the second alkaline mixed solution undergo a gas-liquid reaction and a bisulfite solution is obtained;
by mixing the sulfite solution obtained by the reaction with the second alkaline solution, sulfur dioxide in the second mixed gas can be further absorbed, and thus the amount of the second alkaline solution used can be reduced.
The desulfurizing agent in the step six is prepared by mixing N-methyldiethanolamine, rosin and kitchen waste grease at 80-100 ℃, placing the mixture in ultrasonic treatment, controlling the ultrasonic frequency to be 30-300Hz, treating for 1-3min, adding metal oxide into the mixture, and stirring at the stirring speed of 1000-3000r/min for 10-30min, wherein the ultrasonic treatment frequency is 200-300Hz;
in the sixth step, after the carbon black primary material and the desulfurizing agent are mixed, the method further comprises the step of adopting ultrasonic frequency of 30-50Hz to treat for 10-30s.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The pyrolysis reaction method for the junked tires is characterized by comprising the following steps of:
step one: firstly, the waste tires enter a wire drawing unit, and iron wires in the waste tires are drawn out by the wire drawing unit;
step two: putting the waste tires subjected to filament drawing into a crushing unit for crushing, wherein the feeding crushing unit sequentially comprises a feeding bin, a crushing bin, a sealing bin and a distributing device which are communicated from top to bottom, and a discharge hole of the distributing device is connected with a feed inlet of a pyrolysis processor;
step three: adding the crushed junked tires into a pyrolysis processor, and carrying out pyrolysis treatment on the crushed junked tires through the pyrolysis processor;
step four: carrying out gas-liquid reaction on pyrolysis gas generated by pyrolysis of waste tires and a first alkaline solution to obtain a sulfide solution and a first mixed gas, burning the first mixed gas to obtain a second mixed gas, carrying out gas-liquid reaction on the second mixed gas and the second alkaline solution to obtain a bisulfite solution and a third mixed gas, removing sulfur dioxide in the third mixed gas, discharging, and mixing the sulfide solution and the bisulfite solution to obtain a sulfite solution and elemental sulfur;
step five: conveying solid slag generated by pyrolysis of waste tires into a discharge unit, wherein a water-cooling jacket is arranged on the discharge unit, the solid slag entering the discharge unit is cooled by the water-cooling jacket, the solid slag is cooled to 30-80 ℃, meanwhile, the discharge unit is communicated with a collecting unit, and the collecting unit is used for collecting and treating carbon black;
step six: mixing the carbon black primary material and the desulfurizing agent according to the mass ratio of 1-3:0.3-0.5, adjusting the temperature to 100-200 ℃ for 10-20s, and cooling to normal temperature to obtain the finished carbon black.
2. The method for pyrolyzing waste tires according to claim 1, wherein the crushing bin is sequentially provided with a primary shearing crushing structure, a star feeder and a secondary shearing crushing mechanism from top to bottom, the waste tires enter the feeding bin, are subjected to primary shearing to form blocks through the primary shearing crushing structure, are quantitatively fed into the secondary shearing crushing structure through the star feeder, and are crushed into 10-30mm particles and enter the sealing bin.
3. The method for pyrolyzing waste tires according to claim 1, wherein the sealed bin is provided with a high level gauge, a low level gauge and an inert gas nozzle; the high and low level gauge ensures that materials are always piled in the sealed bin, thereby realizing material sealing; when the high material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are suspended, and when the low material level is alarmed, the first-stage shearing type crushing structure and the second-stage shearing type crushing structure are started to continue feeding; when material accumulation and clamping occur in the sealed storage bin, inert gas is introduced into the sealed storage bin through an inert gas nozzle.
4. The method for pyrolyzing waste tires according to claim 1, wherein the pyrolysis processor comprises a first thermal analysis section and a second thermal analysis section, the first thermal analysis section is positioned obliquely above the second thermal analysis section, the first thermal analysis section is communicated with the second thermal analysis section through a feed opening, the heat treatment temperature of the first thermal analysis section is 350-450 ℃, the heating rate is 0.5-2 ℃/min, and the heat treatment time is 1-3h; the heat treatment temperature of the second heat analysis section is 700-900 ℃, the heating rate is 2-5 ℃/min, and the heat treatment time is 1-3h.
5. The method for pyrolyzing waste tires according to claim 1, wherein the pyrolysis gas comprises hydrogen sulfide, carbonyl sulfide, carbon dioxide and nitrogen, the metal cations in the first alkaline solution comprise sodium ions and/or potassium ions, and the first mixed gas comprises carbonyl sulfide, carbon dioxide and nitrogen; the second mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen; the metal cations in the second alkaline solution include sodium ions and/or potassium ions; the third mixed gas comprises sulfur dioxide, carbon dioxide and nitrogen.
6. The method for pyrolysis reaction of junked tires according to claim 1, wherein the step of removing sulfur dioxide in the third mixed gas and discharging the removed sulfur dioxide comprises the steps of: carrying out gas-liquid reaction on the third mixed gas and the third alkaline solution to obtain sulfite solution and fourth mixed gas, and discharging the fourth mixed gas; wherein the metal cations in the third alkaline solution comprise sodium ions and/or potassium ions, and the fourth mixed gas comprises carbon dioxide and nitrogen.
7. The method for pyrolysis of junked tires according to claim 1, wherein after the third mixed gas and the third alkaline solution are subjected to gas-liquid reaction, further comprising: and mixing the second alkaline solution with the sulfite solution obtained from the third mixed gas to obtain a first alkaline mixed solution, so that the second mixed gas and the first alkaline mixed solution are subjected to gas-liquid reaction to obtain the bisulfite solution.
8. The method for pyrolyzing waste tires according to claim 1, wherein the desulfurizing agent in the sixth step is prepared by mixing N-methyldiethanolamine, rosin and kitchen waste grease at 80-100 ℃, placing the mixture in ultrasonic treatment, controlling ultrasonic frequency to be 30-300Hz for 1-3min, adding metal oxide into the mixture, and stirring the mixture at a stirring speed of 1000-3000r/min for 10-30 min.
9. The method for pyrolysis reaction of junked tires according to claim 8, wherein the frequency of the ultrasonic treatment is 200-300Hz.
10. The method for pyrolysis of junked tires according to claim 1, wherein in the sixth step, after mixing the carbon black primary material with the desulfurizing agent, the method further comprises treating the mixture with ultrasonic wave at 30-50Hz for 10-30s.
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