CN114769266A - Method for preparing mixed fuel of waste plastics and coal powder injected into blast furnace and injection method thereof - Google Patents
Method for preparing mixed fuel of waste plastics and coal powder injected into blast furnace and injection method thereof Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 121
- 229920003023 plastic Polymers 0.000 title claims abstract description 118
- 239000004033 plastic Substances 0.000 title claims abstract description 118
- 239000000446 fuel Substances 0.000 title claims abstract description 91
- 239000003245 coal Substances 0.000 title claims abstract description 72
- 239000000843 powder Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 title claims abstract description 35
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 17
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 17
- 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 16
- 239000003830 anthracite Substances 0.000 claims abstract description 16
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000460 chlorine Substances 0.000 claims abstract description 12
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 229910000336 copper(I) sulfate Inorganic materials 0.000 claims description 5
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 5
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 5
- 239000000571 coke Substances 0.000 abstract description 14
- 239000002817 coal dust Substances 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- 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
-
- 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
- C10L5/406—Solid fuels essentially based on materials of non-mineral origin on plastic
-
- 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
- C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
- C10L2230/04—Catalyst added to fuel stream to improve a reaction
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to a method for preparing mixed fuel of waste plastics and coal powder injected into a blast furnace and an injection method thereof, belonging to the technical field of fuel injected into the blast furnace. Sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and then removing PVC (polyvinyl chloride) with high chlorine content from the waste plastics; crushing the PVC waste plastic with high chlorine content into sheet waste plastic; uniformly mixing the obtained flaky waste plastics with anthracite to obtain a mixed fuel I, preheating the mixed fuel I, and then heating the mixed fuel I to 20-40 ℃ for 3-5 minutes to obtain a mixed fuel II in which the waste plastics are attached to coal dust or the waste plastics wrap the coal dust; and (3) water quenching the mixed fuel II, and crushing to obtain the waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm. The mixed fuel of waste plastics and coal powder and the injection mode not only solve the pollution caused by waste plastics, but also improve the coal injection ratio and reduce the coke ratio.
Description
Technical Field
The invention relates to a method for preparing mixed fuel of waste plastics and coal dust injected into a blast furnace and an injection method thereof, belonging to the technical field of fuel injected into the blast furnace.
Background
The blast furnace is a core part of steel enterprises, and the improvement of smelting efficiency and further energy conservation and emission reduction of the blast furnace have important significance on the development of steel industry and society. The key of the energy saving and consumption reduction of the blast furnace is to reduce the coke consumption, and the most effective means for the energy saving and emission reduction and coke ratio reduction of the blast furnace at present is to blow carbon and hydrogen-containing substances from a blast furnace tuyere according to documents, and reduce the generation amount of CO by adopting hydrogen reduction or hydrogen-rich gas reduction, so that the carbon emission in the smelting process can be reduced.
As a big world plastic production country, China has serious white pollution. Along with the continuous enhancement of environmental protection consciousness of people, the treatment of waste plastics is more and more concerned by government society and wide citizens. At present, three methods are commonly used for treating waste plastics in countries of the world: recycling, burning for power generation, and piling and burying. So far, a plurality of scholars research the waste plastic injection, and the numerical simulation result of the process of mixing the blast furnace injection coal and the waste plastic shows that: the total combustion efficiency of the fuel can reach more than 90 percent, the combustion behavior of the mixed fuel material of the blast furnace injected coal and the waste plastics in the tuyere area of the blast furnace is between that of the blast furnace independently injected coal powder and the waste plastics, and the blast furnace injected mixed fuel coal and the waste plastics is theoretically feasible. The waste plastics and the coal powder are blown together by adopting a blast furnace blowing process to smelt the steel, so that the pollution caused by the waste plastics is solved, and a new energy source is developed for blast furnace ironmaking.
The blast furnace injection process is a process of reducing a coke ratio by injecting gas, liquid or solid pulverized fuel into a blast furnace to replace a part of coke. The injected fuel comprises natural gas, heavy oil and coal powder, the injected fuel replaces coke to generate heat by oxidizing combustion in a tuyere combustion zone on one hand, CO and H are formed on the other hand, and reducing gas participates in indirect reduction reaction.
The main chemical component of waste plastics is macromolecular hydrocarbon, and after it is combusted, it can produce higher heat energy and chemical energy. The waste plastics are classified, cleaned, dried and the like, and then are made into particles with the particle size of 10 mm, and the particles can replace part of coal powder to be used for blast furnace ironmaking. The waste plastic particles injected into the blast furnace are gasified into H and CO at high temperature in the furnace and in a reducing atmosphere, and they serve as a reducing agent to reduce iron ore into iron during the rising with hot wind.
The reaction formula is as follows:
air port area:
gas rising process:
in the formula
、
Is the heat of reaction formation.
The ratio of H/CO generated by waste plastics in gasification is larger than that of equivalent coal powder, and the diffusion capacity and the reduction capacity of H are both larger than that of CO, so that the waste plastics are used for replacing the coal powder to be beneficial to reducing the coke ratio of a blast furnace; meanwhile, because the ash content and the sulfur content of the plastic are very low, the lime consumption of the blast furnace can be reduced, and further, the slag production amount of the blast furnace and the iron-making cost are reduced; the average heat value of the plastic is about 40.00GJ/kg and is greater than the heat value of the coal powder (25.00-31.00 GJ/kg), the production efficiency of the blast furnace is improved, the discharge amount of harmful gas is small, and the environmental pollution is reduced.
In the existing industrial application of waste blast furnace injection, waste plastics serving as waste are injected into a blast furnace only as auxiliary injection fuel, and the auxiliary injection fuel is injected under the condition that the auxiliary injection fuel is only injected, and pulverized coal fuel is not used or is mainly used. The waste plastics and the pulverized coal are injected into the blast furnace in a separate injection manner.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a method for preparing a mixed fuel of waste plastics and coal dust injected into a blast furnace and an injection method thereof. The waste plastic and the coal powder are mixed together and then are subjected to heat treatment to obtain the waste plastic-coal powder mixed fuel, and then the waste plastic-coal powder mixed fuel is sprayed into the tuyere zone of the blast furnace. The mixed fuel of waste plastics and coal powder and the injection mode not only solve the pollution caused by waste plastics, but also improve the coal injection ratio and reduce the coke ratio. The invention is realized by the following technical scheme.
A method for preparing mixed fuel of waste plastics and coal powder injected into a blast furnace comprises the following specific steps:
(1) sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and then removing PVC (polyvinyl chloride) with high chlorine content from the waste plastics;
(2) crushing the PVC waste plastics with high chlorine content removed in the step (1) into 80 mu m sheet waste plastics by a plastic crusher;
(3) uniformly mixing the flaky waste plastics obtained in the step (2) with anthracite according to 20-25% of the mass of the anthracite to obtain a mixed fuel I, preheating the mixed fuel I at 165-180 ℃ for 2-5min, heating to 185-230 ℃ and treating for 3-5min to obtain a mixed fuel II with the waste plastics attached to the coal powder or the waste plastics wrapping the coal powder;
(4) and (4) performing water quenching on the mixed fuel II obtained in the step (3), and crushing to obtain a waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm.
And (2) in the step (1), bag-shaped and bottle-shaped waste plastics are recycled together, and film-shaped waste plastics are separated by a film-shaped plastic classifier to obtain block plastics.
10.79wt% of ash, 8.26wt% of volatile matters and 80.95wt% of fixed carbon in the anthracite.
The injection method of the waste plastic and coal powder mixed fuel prepared by the method for preparing the blast furnace injection waste plastic and coal powder mixed fuel comprises the following steps of mixing the waste plastic-coal powder mixed fuel III and a catalyst according to the mass ratio of 20.3: 1, mixing and blowing into the blast furnace from 8-15cm above the tuyere plane.
The catalyst is MnO with mass ratio2：Fe3O2：La2O3：Cu2SO4And (4) a mixed composition of =2.3:0.68:1.87: 0.43.
The mixed fuel is mixed with high-temperature hot air in a belly pipe and an air port convolution area, the temperature is gradually increased, three stages of moisture evaporation, ignition combustion of volatile components and combustion of fixed carbon are successively carried out in the period, and the three stages cannot be separated in the actual blast furnace injection process, but are overlapped and staggered.
When the proportion of waste plastics is 20%, the organic volatile matter in the mixed fuel is more than 23%, and the volatile gas composition mainly comprises CO and CO2、CmHnO1、O2、H2、H2O, and the like. As the temperature increases, the mixed fuel starts to pyrolyze, drawing out volatile gases (volatiles). The low molecular substances in the mixed fuel are firstly decomposed and gasified, and the large molecules are cracked into small molecules to gas. As the mixed fuel is heated, the temperature of the volatile components is rapidly increased, and the chemical reaction between combustible substances in the volatile components and oxygen is accelerated.
The invention has the beneficial effects that:
(1) the waste plastics and the coal dust are mixed to obtain the waste plastics-coal dust mixed fuel for injection, the treatment scale of the blast furnace is large, and the problem that the waste plastics are accumulated to pollute the environment can be effectively solved.
(2) Waste plastics and coal powder are mixed to obtain waste plastics-coal powder mixed fuel for injection, so that the iron-coke ratio per ton is greatly reduced, the dependence on coke resources is further reduced, and the reasonable distribution and utilization of domestic coal resources are effectively promoted.
(3) The mixed fuel of waste plastics and coal powder and the blowing mode not only solve the pollution caused by waste plastics, but also improve the coal injection ratio and reduce the coke ratio.
Drawings
FIG. 1 is a process flow diagram of the present invention;
figure 2 is a schematic view of the blowing mode of 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 waste plastics and coal dust injected into the blast furnace comprises the following specific steps:
(1) sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and removing PVC with high chlorine content from the waste plastics; the classified recovery comprises the steps of recovering bag-shaped and bottle-shaped waste plastics together, and separating film-shaped waste plastics by a film-shaped plastic classifier to obtain block plastics;
(2) crushing the PVC waste plastic (ash content: 6.26 wt%; volatile matter: 90.05 wt%; fixed carbon: 3.69 wt%) with high chlorine content removed in step (1) into sheet waste plastic of 80 μm by a plastic crusher;
(3) uniformly mixing the flaky waste plastic obtained in the step (2) with anthracite (10.79 wt% of ash, 8.26wt% of volatile matters and 80.95wt% of fixed carbon in the anthracite) according to 20% of the mass of the anthracite to obtain a mixed fuel I, preheating the mixed fuel I at 165 ℃ for 2min, heating the mixed fuel I to 185 ℃ and processing the mixed fuel I for 5min to obtain a mixed fuel II in which waste plastic is attached to coal powder or the waste plastic wraps the coal powder;
(4) and (4) performing water quenching on the mixed fuel II obtained in the step (3), and crushing to obtain a waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm.
As shown in fig. 2, in the injection method of the mixed fuel of waste plastics and pulverized coal prepared by the method for preparing the mixed fuel of waste plastics and pulverized coal injected into the blast furnace, the mixed fuel of waste plastics-pulverized coal iii and the catalyst are mixed according to the mass ratio of 20.3: 1 and then blowing the mixture into a blast furnace from 8cm above the plane of a tuyere.
Wherein the catalyst is MnO in mass ratio2：Fe3O2：La2O3：Cu2SO4And (4) a mixed composition of =2.3:0.68:1.87: 0.43.
Compared with the single pulverized coal injection, the waste plastic-pulverized coal mixed fuel III obtained by the invention has the advantages that the coal injection ratio is improved by 12.5kg/t and the coke ratio is averagely reduced by 16.2 kg/t.
Example 2
As shown in figure 1, the method for preparing the mixed fuel of waste plastics and coal dust injected into the blast furnace comprises the following specific steps:
(1) sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and then removing PVC (polyvinyl chloride) with high chlorine content from the waste plastics; the classified recovery comprises the steps of recovering bag-shaped and bottle-shaped waste plastics together, and separating the film-shaped waste plastics by a film-shaped plastic classifier to obtain block plastics;
(2) crushing the PVC waste plastic (ash content: 6.26 wt%; volatile matter: 90.05 wt%; fixed carbon: 3.69 wt%) with high chlorine content removed in step (1) into sheet waste plastic of 80 μm by a plastic crusher;
(3) uniformly mixing the flaky waste plastic obtained in the step (2) with anthracite (10.79 wt% of ash in the anthracite, 8.26wt% of volatile matter and 80.95wt% of fixed carbon) according to the mass of the anthracite to obtain a mixed fuel I, preheating the mixed fuel I at 180 ℃ for 5min, heating to 230 ℃ and treating for 3min to obtain a mixed fuel II with waste plastic attached to coal powder or the waste plastic wrapping the coal powder;
(4) and (4) performing water quenching on the mixed fuel II obtained in the step (3), and crushing to obtain a waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm.
As shown in fig. 2, in the injection method of the mixed fuel of waste plastics and pulverized coal prepared by the method for preparing the mixed fuel of waste plastics and pulverized coal injected into the blast furnace, the mixed fuel of waste plastics-pulverized coal iii and the catalyst are mixed according to the mass ratio of 20.3: 1 and then blowing the mixture into a blast furnace from 15cm above the plane of a tuyere.
Wherein the catalyst is MnO in mass ratio2：Fe3O2：La2O3：Cu2SO4Mix composition =2.3:0.68:1.87: 0.43.
Compared with the single pulverized coal injection, the waste plastic-pulverized coal mixed fuel III obtained by the invention has the advantages that the coal injection ratio 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 waste plastics and coal dust injected into the blast furnace comprises the following specific steps:
(1) sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and then removing PVC (polyvinyl chloride) with high chlorine content from the waste plastics; the classified recovery comprises the steps of recovering bag-shaped and bottle-shaped waste plastics together, and separating film-shaped waste plastics by a film-shaped plastic classifier to obtain block plastics;
(2) crushing the PVC waste plastic (ash content: 6.26 wt%; volatile matter: 90.05 wt%; fixed carbon: 3.69 wt%) with high chlorine content removed in step (1) into sheet waste plastic of 80 μm by a plastic crusher;
(3) uniformly mixing the flaky waste plastic obtained in the step (2) with anthracite (10.79 wt% of ash, 8.26wt% of volatile matters and 80.95wt% of fixed carbon in the anthracite) according to the mass of 24% of the anthracite to obtain a mixed fuel I, preheating the mixed fuel I at the temperature of 170 ℃ for 3min, heating the mixed fuel I to the temperature of 200 ℃ and processing the mixed fuel I for 4min to obtain a mixed fuel II in which waste plastic is attached to coal powder or the waste plastic wraps the coal powder;
(4) and (4) carrying out water quenching on the mixed fuel II obtained in the step (3), and crushing to obtain the waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm.
As shown in fig. 2, in the injection method of the mixed fuel of waste plastics and pulverized coal prepared by the method for preparing the mixed fuel of waste plastics and pulverized coal injected into the blast furnace, the mixed fuel of waste plastics-pulverized coal iii and the catalyst are mixed according to the mass ratio of 20.3: 1 and then the mixture is blown into a blast furnace from 10cm above the tuyere plane.
Wherein the catalyst is MnO in mass ratio2：Fe3O2：La2O3：Cu2SO4And (4) a mixed composition of =2.3:0.68:1.87: 0.43.
Compared with the single pulverized coal injection, the waste plastic-pulverized coal mixed fuel III obtained by the invention has the advantages that the coal injection ratio is improved by 15.6kg/t and the coke ratio is averagely reduced by 18.3 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 mixed fuel of waste plastics and coal powder injected into a blast furnace is characterized by comprising the following specific steps:
(1) sorting and recycling bag-shaped, film-shaped or bottle-shaped waste plastics, and then removing PVC (polyvinyl chloride) with high chlorine content from the waste plastics;
(2) crushing the PVC waste plastics with high chlorine content removed in the step (1) into sheet waste plastics of 80 mu m;
(3) uniformly mixing the flaky waste plastic obtained in the step (2) with anthracite according to 20-25% of the mass of the anthracite to obtain a mixed fuel I, preheating the mixed fuel I at 165-180 ℃ for 2-5min, and then heating the mixed fuel I to 185-230 ℃ for treatment for 3-5min to obtain a mixed fuel II in which waste plastic is attached to coal powder or wraps the coal powder;
(4) and (4) performing water quenching on the mixed fuel II obtained in the step (3), and crushing to obtain a waste plastic-coal powder mixed fuel III with the particle size of 0.063-0.074 mm.
2. The method for preparing a mixed fuel of blast furnace injection waste plastic and pulverized coal as claimed in claim 1, wherein: and (2) in the step (1), bag-shaped and bottle-shaped waste plastics are recycled together, and film-shaped waste plastics are separated by a film-shaped plastic classifier to obtain block plastics.
3. The method for preparing a mixed fuel of blast furnace injection waste plastic and pulverized coal as claimed in claim 1, wherein: 10.79wt% of ash, 8.26wt% of volatile matters and 80.95wt% of fixed carbon in the anthracite.
4. The injection method of the mixed fuel of waste plastics and pulverized coal prepared by the method of preparing the mixed fuel of waste plastics and pulverized coal injected into a blast furnace according to claim 1, characterized by comprising: mixing waste plastic-coal powder mixed fuel III and a catalyst according to the mass ratio of 20.3: 1 and then blowing the mixture into a blast furnace from 8-15cm above the plane of a tuyere.
5. The method for injecting mixed fuel of waste plastics and pulverized coal as claimed in claim 4, wherein: the catalyst is MnO with mass ratio2：Fe3O2：La2O3：Cu2SO4And (4) a mixed composition of =2.3:0.68:1.87: 0.43.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115820953A (en) * | 2023-02-08 | 2023-03-21 | 山西潞安环保能源开发股份有限公司 | Blast furnace injection coal containing coke powder and waste plastic and coal blending method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115820953A (en) * | 2023-02-08 | 2023-03-21 | 山西潞安环保能源开发股份有限公司 | Blast furnace injection coal containing coke powder and waste plastic and coal blending method |
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