CN115011745A - Method for preparing blast furnace blowing waste tire and pulverized coal mixed fuel and blowing method thereof - Google Patents
Method for preparing blast furnace blowing waste tire and pulverized coal mixed fuel and blowing method thereof Download PDFInfo
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- CN115011745A CN115011745A CN202210114944.6A CN202210114944A CN115011745A CN 115011745 A CN115011745 A CN 115011745A CN 202210114944 A CN202210114944 A CN 202210114944A CN 115011745 A CN115011745 A CN 115011745A
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- 239000003245 coal Substances 0.000 title claims abstract description 88
- 239000010920 waste tyre Substances 0.000 title claims abstract description 82
- 239000000446 fuel Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007664 blowing Methods 0.000 title claims description 31
- 239000002245 particle Substances 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 56
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000002699 waste material Substances 0.000 claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 229920001971 elastomer Polymers 0.000 claims abstract description 16
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003830 anthracite Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 230000008014 freezing Effects 0.000 claims abstract description 11
- 238000007710 freezing Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims description 15
- 239000004753 textile Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000571 coke Substances 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 229920002209 Crumb rubber Polymers 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 10
- 230000009467 reduction Effects 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 244000043261 Hevea brasiliensis Species 0.000 description 3
- 229920003052 natural elastomer Polymers 0.000 description 3
- 229920001194 natural rubber Polymers 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- -1 benzene-ethylbenzene-benzene-xylene Chemical group 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention relates to a method for preparing a mixed fuel of blast furnace injection waste tires and pulverized coal and an injection method thereof, belonging to the technical field of blast furnace injection. Cutting and crushing the waste tire by a cutting machine to obtain colloidal particles with the particle size of 25 mm; passing the obtained colloidal particles through a fiber suction device; removing 90-95wt% of steel wires in the waste tire by the treated colloidal particles through a tape crossed magnetic field; freezing the colloidal particles without the steel wires in liquid nitrogen, and crushing by a hammer crusher to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes; uniformly mixing the obtained rubber crumb rubber of the waste tire and anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-coal powder mixed fuel I at 170 ℃, and then heating to obtain a waste tire-coal powder mixed fuel II; and adding water to the obtained waste tire-coal powder mixed fuel II for water quenching, and crushing to obtain a waste tire and coal powder mixed fuel III. The invention improves the combustion rate, effectively reduces the coke ratio and improves the coal injection ratio.
Description
Technical Field
The invention relates to a method for preparing a mixed fuel of blast furnace injection waste tires and pulverized coal and an injection method thereof, belonging to the technical field of blast furnace injection.
Background
The improvement of the smelting efficiency of the blast furnace and the further energy conservation and emission reduction have important significance for the steel industry and the social development. The key of blast furnace energy saving and consumption reduction is to reduce coke consumption, the most effective means of blast furnace energy saving and emission reduction and coke ratio reduction at present is blast furnace blowing technology, carbon and hydrogen containing substances are blown from a blast furnace tuyere, and the generation amount of CO can be reduced by adopting hydrogen reduction or hydrogen-rich gas reduction, so that the carbon emission in the smelting process can be reduced.
With the improvement of the global automobile holding quantity, the problems of environmental pollution and resource waste caused by waste tires are increasingly prominent. According to the world sanitation organization statistics, the world inventory of junked tires has reached 30 hundred million and increased by about 10 hundred million surprised numbers each year. The amount of waste and old Chinese tires is 2 hundred million, and is increased at a rate of about 6500 million per year. However, the recycling rate of the waste tires is far lower than that of the developed countries.
The waste tyre belongs to a high molecular polymer material, and is difficult to degrade under natural conditions, and cannot rot and deteriorate after being abandoned on the ground or buried underground for a long time. The accumulation of the waste tires is harmful to the health of people and is easy to cause fire, and people refer to the image of the waste tires as black pollution. When the waste tires are burnt in a common incinerator, toxic gases such as CO, VOC (volatile toxic organic compounds), BTEX (benzene-ethylbenzene-benzene-xylene mixed gas) and PAH (carcinogen consisting of two or more aromatic rings) are released, and the health of people is seriously harmed.
Compared with the stable waste plastic synthetic material of the waste tyre, the chemical components of the waste tyre are more, the component difference is larger, and the waste tyre has limited synthetic material content and more stable components due to the process standard and the use requirement. C, H has stable combustible base, high H content and high heat generation, and has gasification effect superior to that of coal powder and superior to that of coal powder in furnace condition and airflow distribution. The S content is stabilized at about 1.5%, and is within the range acceptable for blast furnace as long as the S content is not large-scale blowing.
In recent years, with the success and progress of the technique of injecting pulverized coal into a blast furnace, more and more scholars search for new injected materials, and study and apply a numerical simulation method: numerical simulation of blast furnace mixed blowing coal dust and waste tires, as for a matter of introduction and the like, a three-dimensional mathematical model of a combustion process of coal dust in a blast furnace tuyere is established, when waste tires are singly blown, the burn-out rate in the tuyere reaches 89%, when the ratio of the waste tires to the coal dust is 1:1, the burn-out rate is 50%, and when pure coal dust is blown, the burn-out rate is 30.38%. Therefore, the method proves that the method is feasible for smelting steel by blowing the waste tires and the coal powder together by adopting the blast furnace blowing process, can replace a part of the coal powder, saves the cost, provides a new way for solving the environmental pollution generated by the waste tires, and has great economic value and social benefit.
In the existing blast furnace waste tire blowing process, waste tires are used as auxiliary blowing fuel, coal powder is used as main blowing fuel, the main blowing fuel is used as the main blowing fuel in the blast furnace blowing process, and the auxiliary blowing fuel is not blown without blowing. Namely, the waste tires and the coal dust are respectively blown.
The invention provides a method for preparing mixed fuel by mixing and processing waste tires and pulverized coal on the basis of blowing the waste tires in the existing blast furnace, and the specific blowing method of the invention effectively reduces the coke ratio and improves the coal injection ratio on the basis of improving the combustion rate.
Disclosure of Invention
Aiming at the problems and the defects of the prior art, the invention provides a method for preparing a mixed fuel of blast furnace injection waste tires and pulverized coal and an injection method thereof. The invention improves the combustion rate, effectively reduces the coke ratio and improves the coal injection ratio. The invention is realized by the following technical scheme.
A method for preparing a mixed fuel of blast furnace injection waste tires and pulverized coal comprises the following specific steps:
(1) cutting the waste tire into blocks of 50mm multiplied by 50mm by a cutting machine;
(2) crushing the blocks obtained in the step (1) by a double-roller crusher to obtain colloidal particles with the particle size of 25 mm;
(3) passing the colloidal particles obtained in the step (2) through a fiber air suction device to remove residual textile fabrics in the colloidal particles;
(4) removing 90-95wt% of steel wires in the waste tire from the colloidal particles treated in the step (3) through a tape crossed magnetic field;
(5) freezing the colloidal particles with the steel wires removed in the step (4) in liquid nitrogen, then crushing by using a hammer crusher, and further separating residual steel wires and textiles in the colloidal particles to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes;
(6) uniformly mixing the 30-40-mesh waste tire rubber crumb powder obtained in the step (5) with anthracite coal powder according to 10-20% of the mass of the anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-coal powder mixed fuel I at 170 ℃ for 1-3min, then heating to 190-210 ℃ for 3-5min, and attaching the softened and contracted waste tire rubber particles to the surface of coal to obtain a waste tire-coal powder mixed fuel II;
(7) and (4) adding water to the waste tire-coal powder mixed fuel II obtained in the step (6) for water quenching, and then crushing to obtain a waste tire and coal powder mixed fuel III with the particle size of 35 meshes.
The freezing temperature of the liquid nitrogen in the step (5) is-160 ℃ to-196 ℃.
In the step (6), the anthracite coal powder accounts for 75% in 200 meshes, the ash in the anthracite coal powder accounts for 10.79%, the volatile matter accounts for 8.26%, and the fixed carbon accounts for 80.95%.
A method for blowing a mixed fuel of waste tires and pulverized coal comprises the following steps of mixing a mixed fuel III of waste tires and pulverized coal with a catalyst according to a mass ratio of 9.75-20.59: 1, and blowing the mixture into a blast furnace from a position 10-15cm above the plane of a tuyere.
The catalyst is CeO in mass ratio 2 ：CaCO 3 ：MgCO 3 ：MnO 2 = 3.74: 0.32: 0.29: 0.30 mixing the catalyst.
The calorific value (35.0 MJ/kg) of the waste tire rubber is not lower than that of the blast furnace mixed injection coal dust, the content of H is obviously higher than that of the coal dust, the H reacts in a tuyere raceway to provide more heat for blast furnace smelting production, the rest H can participate in ore reduction at the upper part of the blast furnace, and the activity of the rest H is obviously higher than that of C.
The invention has the beneficial effects that:
(1) the waste tire of the invention mainly comprises carbon and hydrogen elements, the mass fraction of hydrogen is higher than that of coal coke, and the blowing of the waste tire in a blast furnace can not only improve the reduction of iron ore but also reduce the emission of greenhouse gas carbon dioxide.
(2) The invention has simple flow and less capital investment, and can be industrially applied without special great reformation on the basis of the traditional blast furnace coal powder injection.
(3) The method for preparing the mixed fuel by mixing the waste tires and the pulverized coal, and the specific injection method of the invention effectively reduce the coke ratio and improve the coal injection ratio on the basis of improving the combustion rate.
Drawings
FIG. 1 is a process flow diagram of the present invention;
figure 2 is a schematic view of blowing according to the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
As shown in figure 1, the method for preparing the mixed fuel of the blast furnace injection waste tyre and the coal dust comprises the following specific steps:
(1) cutting waste tires (natural rubber is used as a main body) into blocks of 50mm multiplied by 50mm by a cutting machine;
(2) crushing the blocks obtained in the step (1) by a double-roller crusher to obtain colloidal particles with the particle size of 25 mm;
(3) passing the colloidal particles obtained in the step (2) through a fiber air suction device to remove residual textile fabrics in the colloidal particles;
(4) removing 90wt% of steel wires in the waste tire by passing the colloidal particles treated in the step (3) through a tape crossed magnetic field;
(5) freezing the colloidal particles with the steel wires removed in the step (4) in liquid nitrogen, wherein the freezing temperature of the liquid nitrogen is-196 ℃, then crushing by using a hammer crusher, and further separating residual steel wires and textiles in the colloidal particles to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes;
(6) uniformly mixing the 30-40-mesh waste tire rubber crumb powder obtained in the step (5) with anthracite coal powder according to 10% of the mass of the anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-pulverized coal mixed fuel I at 170 ℃ for 1min, then heating to 190 ℃ for 5min, and attaching the softened and contracted waste tire colloidal particles on the surface of coal to obtain a waste tire-pulverized coal mixed fuel II;
(7) and (4) adding water to the waste tire-coal powder mixed fuel II obtained in the step (6) for water quenching, and then crushing to obtain a waste tire and coal powder mixed fuel III with the particle size of 35 meshes.
As shown in fig. 2, in the method for injecting the waste tire and pulverized coal mixed fuel, the mass ratio of the waste tire and pulverized coal mixed fuel iii to the catalyst is 20.59: 1 mixing, blowing from 10cm above the tuyere planeAnd (4) putting the mixture into a blast furnace. Wherein the catalyst is CeO in mass ratio 2 ：CaCO 3 ：MgCO 3 ：MnO 2 = 3.74: 0.32: 0.29: 0.30 part of mixed catalyst.
Compared with the single pulverized coal injection, the invention improves the coal injection ratio of the blast furnace injection mixed fuel by 12.5kg/t and averagely reduces the coke ratio by 16.2 kg/t.
Example 2
As shown in figure 1, the method for preparing the mixed fuel of the blast furnace injection waste tyre and the coal dust comprises the following specific steps:
(1) cutting waste tires (natural rubber is used as a main body) into blocks of 50mm multiplied by 50mm by a cutting machine;
(2) crushing the blocks obtained in the step (1) by a double-roller crusher to obtain colloidal particles with the particle size of 25 mm;
(3) removing residual textile fabrics in the colloidal particles by passing the colloidal particles obtained in the step (2) through a fiber suction device;
(4) removing 95wt% of steel wires in the waste tire by passing the colloidal particles treated in the step (3) through a tape crossed magnetic field;
(5) freezing the colloidal particles with the steel wires removed in the step (4) in liquid nitrogen, wherein the freezing temperature of the liquid nitrogen is-160 ℃, then crushing by using a hammer crusher, and further separating residual steel wires and textiles in the colloidal particles to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes;
(6) uniformly mixing the 30-40-mesh waste tire rubber crumb powder obtained in the step (5) with anthracite coal powder according to 20% of the mass of the anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-pulverized coal mixed fuel I at 170 ℃ for 3min, then heating to 210 ℃ for 3min, and attaching the softened and contracted waste tire colloidal particles on the surface of coal to obtain a waste tire-pulverized coal mixed fuel II;
(7) and (4) adding water to the waste tire-coal powder mixed fuel II obtained in the step (6) for water quenching, and then crushing to obtain a waste tire and coal powder mixed fuel III with the particle size of 35 meshes.
As shown in fig. 2, in the method for blowing the waste tire and pulverized coal mixed fuel, the waste tire and pulverized coal mixed fuel iii and a catalyst are mixed according to the mass ratio of 9.75: 1 mixing fromBlowing into the blast furnace 15cm above the tuyere plane. Wherein the catalyst is CeO in mass ratio 2 ：CaCO 3 ：MgCO 3 ：MnO 2 = 3.74: 0.32: 0.29: 0.30 mixing the catalyst.
Compared with the single pulverized coal injection, the pulverized coal injection ratio of the blast furnace injection mixed fuel is improved by 21.5kg/t, and the coke ratio is averagely reduced by 26.3 kg/t.
Example 3
As shown in figure 1, the method for preparing the mixed fuel of the blast furnace injection waste tyre and the coal dust comprises the following specific steps:
(1) cutting waste tires (natural rubber is used as a main body) into blocks of 50mm multiplied by 50mm by a cutting machine;
(2) crushing the blocks obtained in the step (1) by a double-roller crusher to obtain colloidal particles with the particle size of 25 mm;
(3) removing residual textile fabrics in the colloidal particles by passing the colloidal particles obtained in the step (2) through a fiber suction device;
(4) removing 90wt% of steel wires in the waste tire by passing the colloidal particles treated in the step (3) through a tape crossed magnetic field;
(5) freezing the colloidal particles with the steel wires removed in the step (4) in liquid nitrogen, wherein the freezing temperature of the liquid nitrogen is-178 ℃, then crushing by using a hammer crusher, and further separating residual steel wires and textiles in the colloidal particles to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes; (6) uniformly mixing the 30-40-mesh waste tire rubber crumb powder obtained in the step (5) with anthracite coal powder according to 18% of the mass of the anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-coal powder mixed fuel I at 170 ℃ for 2min, then heating to 200 ℃ for 4min, and attaching the softened and contracted waste tire rubber particles to the surface of coal to obtain a waste tire-coal powder mixed fuel II;
(7) and (4) adding water into the waste tire-coal powder mixed fuel II obtained in the step (6) for water quenching, and then crushing to obtain a waste tire and coal powder mixed fuel III with the particle size of 35 meshes.
As shown in fig. 2, in the method for blowing the waste tire and pulverized coal mixed fuel, the mass ratio of the waste tire and pulverized coal mixed fuel iii to the catalyst is 14.3: 1 mixing, from the tuyereBlowing into the blast furnace 13cm above the plane. Wherein the catalyst is CeO in mass ratio 2 ：CaCO 3 ：MgCO 3 ：MnO 2 = 3.74: 0.32: 0.29: 0.30 mixing the catalyst.
Compared with the single pulverized coal injection, the invention improves the coal injection ratio of the blast furnace injection mixed fuel by 18.7kg/t and averagely reduces the coke ratio by 21.4 kg/t.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (5)
1. A method for preparing a mixed fuel of blast furnace injection waste tires and pulverized coal is characterized by comprising the following specific steps:
(1) cutting the waste tire into blocks of 50mm multiplied by 50 mm;
(2) crushing the blocks obtained in the step (1) to obtain colloidal particles with the particle size of 25 mm;
(3) passing the colloidal particles obtained in the step (2) through a fiber air suction device;
(4) removing 90-95wt% of steel wires in the waste tire from the colloidal particles treated in the step (3) through a tape crossed magnetic field;
(5) freezing the colloidal particles with the steel wires removed in the step (4) in liquid nitrogen, then crushing, and further separating residual steel wires and textiles in the colloidal particles to obtain waste tire rubber colloidal particle powder with the particle size of 30-40 meshes;
(6) uniformly mixing the 30-40-mesh waste tire rubber crumb powder obtained in the step (5) with anthracite coal powder according to 10-20% of the mass of the anthracite coal powder to obtain a waste tire-coal powder mixed fuel I; preheating the waste tire-pulverized coal mixed fuel I at 170 ℃ for 1-3min, heating to 190-210 ℃ for 3-5min, and attaching the softened and contracted waste tire rubber particles to the surface of coal to obtain a waste tire-pulverized coal mixed fuel II;
(7) and (4) adding water to the waste tire-coal powder mixed fuel II obtained in the step (6) for water quenching, and then crushing to obtain a waste tire and coal powder mixed fuel III with the particle size of 35 meshes.
2. The method for preparing the blast furnace blowing scrap tire and pulverized coal mixed fuel according to claim 1, wherein: the freezing temperature of the liquid nitrogen in the step (5) is-160 ℃ to-196 ℃.
3. The method for preparing the blast furnace blowing scrap tire and pulverized coal mixed fuel according to claim 1, wherein: in the step (6), the anthracite coal powder accounts for 75% in 200 meshes, the ash in the anthracite coal powder accounts for 10.79%, the volatile matter accounts for 8.26%, and the fixed carbon accounts for 80.95%.
4. A method for blowing a mixed fuel of waste tires and fine coals, which is manufactured by the method for manufacturing a mixed fuel of waste tires and fine coals for blowing into a blast furnace according to claim 1, comprising the steps of: mixing a waste tire and pulverized coal mixed fuel III with a catalyst according to the mass ratio of 9.75-20.59: 1, and blowing the mixture into a blast furnace from a position 10-15cm above the plane of a tuyere.
5. The method for injecting a mixed fuel of waste tires and pulverized coal as claimed in claim 4, wherein: the catalyst is CeO in mass ratio 2 ：CaCO 3 ：MgCO 3 ：MnO 2 = 3.74: 0.32: 0.29: 0.30 mixing the catalyst.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210114944.6A CN115011745B (en) | 2022-01-31 | 2022-01-31 | Method for preparing blast furnace injection waste tire and pulverized coal mixed fuel and injection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210114944.6A CN115011745B (en) | 2022-01-31 | 2022-01-31 | Method for preparing blast furnace injection waste tire and pulverized coal mixed fuel and injection method thereof |
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| CN115011745A true CN115011745A (en) | 2022-09-06 |
| CN115011745B CN115011745B (en) | 2024-03-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001234214A (en) * | 2000-02-16 | 2001-08-28 | Nkk Corp | Blast furnace operation method |
| WO2008039088A1 (en) * | 2006-09-28 | 2008-04-03 | Jerzy Piotr Gul | Reductant for blast furnace charge |
| US20100037729A1 (en) * | 2000-09-15 | 2010-02-18 | Siddhartha Gaur | Blast furnace metallurgical coal substitute products and method |
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