CN117684002A - Fuel size fraction and process optimization method - Google Patents
Fuel size fraction and process optimization method Download PDFInfo
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- CN117684002A CN117684002A CN202311566444.7A CN202311566444A CN117684002A CN 117684002 A CN117684002 A CN 117684002A CN 202311566444 A CN202311566444 A CN 202311566444A CN 117684002 A CN117684002 A CN 117684002A
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- 239000000446 fuel Substances 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005457 optimization Methods 0.000 title claims abstract description 21
- 238000005194 fractionation Methods 0.000 title claims description 7
- 238000005245 sintering Methods 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 64
- 239000002245 particle Substances 0.000 claims abstract description 64
- 239000002028 Biomass Substances 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000012216 screening Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 230000004907 flux Effects 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 6
- 241000209140 Triticum Species 0.000 claims description 5
- 235000021307 Triticum Nutrition 0.000 claims description 5
- 239000010902 straw Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 235000013399 edible fruits Nutrition 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 235000013339 cereals Nutrition 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 abstract description 8
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000010881 fly ash Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 25
- 238000002485 combustion reaction Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000004449 solid propellant Substances 0.000 description 6
- 239000004744 fabric Substances 0.000 description 4
- 239000013072 incoming material Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a fuel particle size fraction and a process optimization method, which belong to the technical field of metallurgy and comprise the following steps: s1, breaking fuel: crushing fuel with particle size not greater than 20 mm; s2, screening fuel: obtaining fine-grade fuel with the particle size smaller than 1mm and coarse-grade fuel with the particle size larger than 3 mm; medium grade fuel with particle size between 1 and 3 mm; s3, optimizing the size fraction: secondary crushing is carried out on the coarse-grade fuel; adding the medium-grade fuel, iron ore powder, flux, return ore and fly ash into a mixer for mixing and pelletizing to obtain a sintering mixture for sintering; s4, process optimization: mixing fine fuel with biomass carbon, adding 5% -6% of atomized water, uniformly mixing, crushing, compressing and granulating to obtain biomass carbon particles with the size of 3mm, feeding the biomass carbon particles into a material distribution link of a sintering machine, and distributing the mixed fuel particles to the front end of a material outlet position of a material bin, wherein the consumption of the mixed fuel particles is 5% -15% of the total fuel ratio, so that the mixed fuel particles can be distributed to the upper part of a material layer.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a fuel particle size fraction and a process optimization method.
Background
In the ferrous metallurgy industry, the sintering process is a process of mixing various powdery iron-containing raw materials with proper fuel and flux, adding proper water, mixing and pelletizing, and sintering on a sintering machine to enable the materials to undergo a series of physical and chemical changes to generate sintered ores. The fuel with uneven granularity, more than 3mm or less than 1mm occupies higher fuel, so that the fuel utilization rate is low, and the air permeability of the sinter bed is reduced, the carbon distribution is uneven, and the quality and the yield of the sinter are affected.
The crushing processing of the common sintering fuel is influenced by the fluctuation of the incoming material particle size, the granularity composition of the sintering fuel cannot be effectively controlled, the fluctuation of the fuel particle size is greatly influenced by the incoming material particle size, the proportion of the incoming material particle size which is larger than 20mm is more than 5%, the proportion of the incoming material particle size which is larger than 3mm after crushing is more than 30%, and the proportion of the fuel particle size which is larger than 3mm is higher, so that the adverse effects are brought to the yield, the strength and the granularity composition of the sintering ore, the fuel consumption is higher, and the environmental protection pressure is increased. The fuel grain size of the sintering requirement is 0.5-3mm, the ratio of the fuel grain size to the sintering requirement is 75-80%, the less other parts (less than 0.5mm and more than 3 mm) are more beneficial to the sintering production, quality and fuel consumption, and production practice shows that the grain size composition of the solid fuel is optimized, the distribution state of the fuel in the mixture can be improved, meanwhile, the technological intervention is carried out in the material distribution process, the fuel is secondarily optimally distributed according to the fuel requirement of the sintering material layer, the combustion condition of the fuel in the sintering process can be improved, and the utilization rate of the fuel is improved.
In the conventional sintering production process, the fuel is usually added once and directly added through a proportioning bin, so that the fuel size requirement must meet the production process requirement, and if the fuel size requirement cannot be met, the fuel proportioning in the production process is required to be adjusted, the reaction time is long, and the fuel consumption is increased. Meanwhile, as the granularity of the fuel is not treated, the large-particle solid fuel is easy to replace return ores to form the core of the mixture pelletization during mixing, so that the fuel is segregated among different pellets, the fuel burns slower than normal fuel, a combustion layer is thickened, the contact condition of the fuel and air is deteriorated to reduce the combustion speed, thereby reducing the vertical sintering speed and finally reducing the sintering production efficiency; and the part of the fuel smaller than 1mm is directly used as fuel for combustion due to smaller particle size, so that the combustion speed is high, meanwhile, the air pressure can be influenced to be pumped away from the sinter bed in the ignition process and the induced draft sintering process, and the due combustion effect can not be achieved, so that the air permeability of the sinter bed is deteriorated, the combustion consumption is increased, and the sintering quality is influenced.
In addition, the automatic heat accumulation function exists in the sintering process, the heat of the lower part of the sintering material layer is higher, the lower material does not need too high fuel content, but the fuel particles with larger solid fuel cannot be adjusted, and the fuel particles are easily distributed to the lower part of the sintering material layer through cloth segregation, so that the lower carbon content is high, and the fuel consumption is increased.
In the prior art, in order to solve the problems, the granularity requirement of fuel is strictly controlled; firstly screening solid fuel, further grinding undersize small-particle-size fuel, preparing mixed balls with iron ore powder, preparing first mixed material from oversize large-particle-size fuel and other materials, and uniformly mixing the first mixed material with the mixed balls to obtain final sintered mixed material, thereby reducing segregation during sintering to improve the quality of sintered ore, and simultaneously fully applying the small-particle-size fuel; however, the cost is high because the small particle size fuel requires further grinding after the fuel is sieved; the particle size of the ground fuel in the mixed balls is smaller, the burning speed of the small-particle fuel is high during sintering, when the heat transfer property of the sintering material is poor, the burning speed of the fuel cannot reach the high temperature required by melting the material layer, the high-temperature reaction is not carried out, the sintering temperature is reduced, the bonding phase of the sintering ore is reduced, the strength of the rotary drum is reduced, the amount of powder is increased, the return ore is increased, and meanwhile, the fine-particle fuel is easy to block the gaps of the mixed balls to obstruct the air flow, so that the sintering ore yield is reduced; in addition, when the large-particle-size fuel is mixed with other materials for pelletization, the large-particle-size fuel is easy to be the core of the other materials, and a thicker adhesive layer is easy to form around the large-particle-size fuel after pelletization, so that the contact between the fuel and air is blocked, the thermal state air permeability is deteriorated in the sintering process, the content of fused magnetite in the sinter is increased, the content of calcium ferrite is reduced, and the reduction performance is reduced.
Disclosure of Invention
The invention aims to meet the actual demands, and provides a fuel size fraction and a process optimization method, which are used for solving the problem of low fuel utilization rate of sintered fuel caused by bigger or smaller size fraction and meeting different demands of a sintering distribution process on fuel consumption.
The invention provides a fuel particle size fraction and a process optimization method, which comprises the following steps:
s1, breaking fuel: crushing fuel with particle size not greater than 20 mm;
s2, screening fuel: screening the fuel by using a screen with the aperture of 3mm and 1mm to obtain fine-grade fuel with the particle size of less than 1mm and coarse-grade fuel with the particle size of more than 3 mm; medium grade fuel with particle size between 1 and 3 mm;
s3, optimizing the size fraction: returning the coarse-grade fuel to a fuel crushing system for secondary crushing; adding the intermediate fuel and iron ore powder, flux, return ore and dust in the sintering raw materials into a mixer to mix and pelletize, and obtaining a sintering mixture to sinter;
s4, process optimization: mixing fine fuel with biomass carbon, adding 5-6% of atomized water, uniformly mixing, crushing, compressing and granulating to obtain biomass carbon particles with the diameter of 3mm, feeding the biomass carbon particles into a material distribution link of a sintering machine through a conveying mechanism, wherein the consumption of the mixed fuel particles in the material distribution process accounts for 5-15% of the total fuel ratio, and the mixed fuel particles are distributed to the front end of a material outlet position of a material bin, so that the mixed fuel particles can be distributed to the upper part of a material layer.
Preferably, the crushing process in S1 is: the body is as follows: the fuel was first crushed to a particle size of less than 10mm by an upper roll having a gap of 10mm, and then crushed to a particle size of less than 3mm by a lower roll having a gap of 3mm.
Preferably, in S3, the coarse grade fuel accounts for 20% -30% of the total fuel, and is returned to the fuel crushing system through a belt for secondary crushing, and finally, all coarse grade fuels are controlled to be 0% -5%.
Preferably, in S4, the biomass carbon includes fruit shells and wheat straw, and the time of adding atomized water for mixing is 1-3 min.
Preferably, in S4, the fine fuel accounting for 2% -10% and the biological carbon are mixed according to the ratio of 1:1 by biomass carbon to prepare mixed biomass fuel, and then crushed to prepare biomass carbon particles with the diameter of 3mm.
Preferably, in S4, the thickness of the material layer is controlled to be 800-950 mm, the part of the material layer from the bottom to 0-50mm is a bedding material, the part of the material layer from 50-800mm is a sintering mixture, the part of the material layer from above 800mm is the sintering mixture and the biomass fuel is mixed, and then the material layer is properly compacted and flattened through a material pressing rod, and finally the material layer is sintered.
Compared with the prior art, the application has the advantages and positive effects that:
the invention solves the problem of low fuel utilization rate of the sintered fuel caused by bigger or smaller size fraction, and simultaneously meets different requirements of the sintering distribution technology on fuel consumption.
1. The invention has simple sintering process, less change of traditional sintering process and strong practicability;
2. under the same condition, compared with the traditional sintering, the sintering method adopting the fuel classification and process optimization of the invention reduces the unit consumption of the solid fuel of the sintering ore by 0.5kg/t;
3. the sintering method reduces the emission of CO2, SO2 and NOx and has the social benefit of improving the air quality.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
Referring to fig. 1, a fuel size fraction and process optimization method comprises the steps of fuel crushing, screening, biomass carbon crushing and granulating, and material distribution, wherein the specific process steps are as follows:
a. breaking fuel: the fuel (coke particles and coal particles) of not more than 20mm is crushed by four rolls, the upper roll gap is crushed to a portion of less than 10mm by 10mm, and the lower roll gap is crushed to a portion of less than 3mm by 3mm.
b. And (3) fuel screening: and screening the sintered fuel by using a sieve with the aperture of 3mm and 1mm to obtain fine-grade fuel with the aperture of less than 1mm, medium-grade fuel with the aperture of 1-3mm and coarse-grade fuel with the aperture of more than 3mm.
c. And (3) particle size fraction optimization: the oversize material is the fuel with the diameter larger than 3mm, and is returned to the fuel crushing system through the return belt for secondary crushing. Wherein, the medium-grade fuel with the diameter of 1-3mm is directly participated in sintering ingredients, and is put into a mixer together with iron ore powder, flux, return ore, dust and the like in the sintering raw materials for mixing and pelletizing to obtain a sintering mixture for sintering.
d. And (3) process optimization: the fuel with the diameter smaller than 1mm is mixed with biomass carbon (fruit shells and wheat straws) and added with 5-6% of atomized water for uniform mixing, then crushed, compressed and granulated into biomass carbon granules with the diameter of 3mm by a crushing granulator, and the biomass carbon granules directly enter a material distribution link of a sintering machine by an auxiliary belt system, wherein the consumption of the mixed fuel granules in the sintering material distribution process accounts for 5-15% of the total fuel ratio. The mixed fuel particles are distributed to the front end of the discharge hole of the storage bin, so that the mixed fuel particles can be distributed to the upper part of the material layer.
In step c, the fraction of the oversize material greater than 3mm is 20-30% of the total fuel. And returning to the fuel crushing system through the belt for secondary crushing. Finally, the part of all the fuel with the diameter larger than 3mm is controlled to be 0-5%.
In the step d, the fine fuel with the diameter smaller than 1mm is mixed with biomass carbon (husks and wheat straws), atomized water with the diameter of 5-6% is added and mixed for 1-3 min, and then crushed, compressed and granulated into biomass carbon granules with the diameter of 3mm, and the biomass carbon granules enter a sintering process for material distribution.
In the step d, the fine fuel with the diameter smaller than 1mm (the proportion of 2-10%) is mixed with biomass carbon such as biological carbon to prepare mixed biomass fuel according to the proportion of 1:1, and then crushed to prepare biomass carbon particles with the diameter of 3mm.
In the step d, the mixed biomass fuel is made into mixed fuel particles with the diameter of 3mm by a crushing granulator, and the mixed fuel particles directly enter a material distribution link of a sintering machine by an auxiliary belt system.
In the step d, the thickness of the material layer is controlled to be 800-950 mm, the part of the material layer from the bottom to 0-50mm is a bedding material, the part of the material layer from the bottom to 50-800mm is a sintering mixture, the part of the material layer from the bottom to the 50-800mm is a sintering mixture and is mixed with biomass fuel, and then the material layer is properly compacted and flattened through a material pressing rod, and finally the material layer is sintered.
In the step d, the dosage of the mixed fuel particles in the sintering distribution process accounts for 5-15% of the total fuel ratio. The mixed fuel particles are distributed to the front end of the discharge hole of the storage bin, so that the mixed fuel particles can be distributed to the upper part of the material layer.
In the fuel pelletization operation step, the moisture of the fuel mixture-biomass carbon pellets is controlled to be 5-6%.
The fuel participates in the sintering process, and the part with the diameter more than 3mm is controlled within 0-5 percent;
the sintering fuel is coke powder and anthracite.
The fuel was sieved through bar sieves with gaps of 3mm and 1 mm.
In the cloth sintering step, the negative pressure generated by the sintering main exhaust fan is-14.0 to-18.0 kpa.
In the cloth sintering step, the ignition temperature is 1000-1150 ℃.
The principle of the invention is as follows: the invention separates the coarse fuel and the fine fuel, and the coarse fuel is crushed again to ensure the optimization of the fuel particle size (the part more than 3mm is reduced to within 5 percent); the fine fuel is optimally processed so as to avoid the large-particle fuel becoming the core of the fine fuel, segregation of the fuel among different balls occurs, the contact condition of the fuel and air is improved, and the combustion speed is increased, so that the vertical sintering speed is increased, and the sintering production efficiency is improved. Secondly, the mixed biological carbon particle fuel cloth is distributed to the upper part of the material layer through process optimization, so that the upper part can be ensured to have enough fuel for sintering, and meanwhile, the automatic heat storage function of the material layer is fully utilized, the fuel quantity of the lower part of the material layer is gradually reduced, and the fuel consumption is reduced.
The invention comprises three parts obtained by crushing coke powder and coal powder and then sieving twice, namely fine fuel smaller than 1mm, middle fuel 1-3mm and coarse fuel larger than 3mm, wherein the gap of the first sieve is 3mm, and coarse fuel with oversize more than 3mm is returned to a fuel crushing system through a return belt for secondary crushing. Wherein, the medium-grade fuel with the diameter of 1-3mm is directly participated in sintering ingredients, and is put into a mixer together with iron ore powder, flux, return ore, dust and the like in the sintering raw materials for mixing and pelletizing to obtain a sintering mixture for sintering. Fine fuel smaller than 1mm is mixed with biomass carbon (fruit shells, wheat straws and the like), a small amount of water is added for uniform mixing, then the mixture is crushed to prepare biomass carbon particles with the diameter of 3mm, and the biomass carbon particles directly enter a material distribution link of a sintering machine through an auxiliary belt system and are distributed to the upper part of a material layer. The invention optimizes the combustion process of the mixture, improves the combustion condition of the fuel, ensures that the mixture quickly enters the raw material sintering process, then drives the sintering to burn vertically through the bottom exhaust system by the upper material layer combustion, reduces the consumption amount of solid fuel, improves the combustion mechanism of the fuel, creates conditions for low-temperature combustion, eliminates the reducing atmosphere, and creates conditions for the formation of calcium ferrite. By adopting the scheme, the invention can effectively reduce the consumption of sintering fuel in the sintering process, thereby reducing carbon and saving energy.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (6)
1. A method of fuel size fraction and process optimization comprising:
s1, breaking fuel: crushing fuel with particle size not greater than 20 mm;
s2, screening fuel: screening the fuel by using a screen with the aperture of 3mm and 1mm to obtain fine-grade fuel with the particle size of less than 1mm and coarse-grade fuel with the particle size of more than 3 mm; medium grade fuel with particle size between 1 and 3 mm;
s3, optimizing the size fraction: returning the coarse-grade fuel to a fuel crushing system for secondary crushing; adding the intermediate fuel and iron ore powder, flux, return ore and dust in the sintering raw materials into a mixer to mix and pelletize, and obtaining a sintering mixture to sinter;
s4, process optimization: mixing fine fuel with biomass carbon, adding 5-6% of atomized water, uniformly mixing, crushing, compressing and granulating to obtain biomass carbon particles with the diameter of 3mm, feeding the biomass carbon particles into a material distribution link of a sintering machine through a conveying mechanism, wherein the consumption of the mixed fuel particles in the material distribution process accounts for 5-15% of the total fuel ratio, and the mixed fuel particles are distributed to the front end of a material outlet position of a material bin, so that the mixed fuel particles can be distributed to the upper part of a material layer.
2. The fuel fraction and process optimization method according to claim 1, wherein the crushing process in S1 is: the body is as follows: the fuel was first crushed to a particle size of less than 10mm by an upper roll having a gap of 10mm, and then crushed to a particle size of less than 3mm by a lower roll having a gap of 3mm.
3. The fuel size fraction and process optimization method according to claim 1, wherein in S3, the coarse grade fuel accounts for 20% -30% of the total fuel, and is returned to the fuel crushing system through a belt for secondary crushing, and finally all coarse grade fuels are controlled to be 0% -5%.
4. The fuel size fraction and process optimization method according to claim 1, wherein in S4, the biomass carbon comprises fruit shells and wheat straw, and the mixing time of adding atomized water is 1-3 min.
5. The fuel grain grade and process optimization method according to claim 1, wherein in S4, fine grade fuel with a proportion of 2% -10% is mixed with biological carbon according to a ratio of 1:1 to prepare mixed biomass fuel, and then crushed to prepare biomass carbon grains with a diameter of 3mm.
6. The fuel grain size and process optimization method according to claim 1, wherein in S4, the thickness of the material layer is controlled to be 800-950 mm, the material layer is divided into a bedding material from the bottom to 0-50mm, the material layer is divided into a sintering mixture from 50-800mm, the material layer is divided into the sintering mixture and the biomass fuel is mixed above 800mm, and then the mixture is properly compacted and flattened through a pressing rod, and finally the sintering is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311566444.7A CN117684002A (en) | 2023-11-22 | 2023-11-22 | Fuel size fraction and process optimization method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311566444.7A CN117684002A (en) | 2023-11-22 | 2023-11-22 | Fuel size fraction and process optimization method |
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| CN117684002A true CN117684002A (en) | 2024-03-12 |
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| CN202311566444.7A Pending CN117684002A (en) | 2023-11-22 | 2023-11-22 | Fuel size fraction and process optimization method |
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| CN (1) | CN117684002A (en) |
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2023
- 2023-11-22 CN CN202311566444.7A patent/CN117684002A/en active Pending
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