CN108531674A - The method for preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke - Google Patents
The method for preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke Download PDFInfo
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- CN108531674A CN108531674A CN201810419081.7A CN201810419081A CN108531674A CN 108531674 A CN108531674 A CN 108531674A CN 201810419081 A CN201810419081 A CN 201810419081A CN 108531674 A CN108531674 A CN 108531674A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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Abstract
The present invention relates to a kind of methods preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke, and the method is using semi-coke as the raw material for preparing pulverized coal injection in blast furnace；And include the steps that the prefabricated powder of semi-coke is prepared separately into semi-coke before semi-coke is completed final powder processed by medium-speed pulverizer.The present invention increases the step of preparing semi-coke prefabricated powder on the basis of existing blast furnace blowing flouring technology, so that with bituminous coal to form granularity poor for semi-coke particles, to accelerate the grinding effect of semi-coke particles, solve the problems, such as that there are semi-coke grinding is difficult in prior art, so that bituminous coal and semi-coke can simultaneous grinding at powder, realize the efficient injection of final blast furnace；Furthermore the corner angle sharpness of semi-coke particles can be improved by preparing the prefabricated powder of semi-coke, its edge is made to become round and smooth, this to the abrasion for conveying blowing device during the follow-up injection of alleviation to playing good effect.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to a kind of to prepare blast furnace spray using semi-coke as blast furnace blowing raw material
Blow the method for coal dust.
Background technology
The application of pulverized coal injection into blast furna Technique Popularizing has achieved huge economic benefit and has obtained extensive approval.With state
Interior steel production capacity increasingly increase and blast-furnace coal powder injection key technology be constantly progressive and it is perfect, the market demand is gradually expanded,
In particular with the increasingly deficient of Chinese high-quality caking coal resource, pulverized coal injection into blast furna the status of smelting iron and steel process procedure increasingly
It improves.
Blast furnace blowing raw material in China's mainly has anthracite, low-volatite bituminous coal (meager coal and meager lean coal), high volatile at present
Three kinds of bituminous coal (mainly jet coal, not glutinous, weakly caking coal, part bottle coal).Match currently, industrially mostly using this 3 type moulded coal greatly
Coal is as blast furnace blowing feed stock for blast furnace.The stock number of China's high-volatile bituminous coal is more, high-quality anthracite, meager coal, meager lean coal
Stock number relative shortage consumes year by year with anthracitic, and resource provisioning is increasingly nervous, and price also gradually rises.In order to seek
Anthracitic substitute is sought, more concerns have been obtained as coal injection raw material about by semi-coke (semicoke), due to China orchid
Charcoal product is produced with special low ash, the high-quality jet coal of special low-sulfur and non caking coal mostly, low, the low flammability of sulphur content with ash content
Can be good, reactivity is good, gasification efficiency is high the features such as, has been equipped with the base for substituting anthracite as injection raw material in theory
Plinth.But there is no large-scale applications in blast furnace blowing for China's semi-coke at present, only tentative input makes in individual enterprises
With mainly there is distinct issues during carrying out powder injection processed using semi-coke as raw material for this, are mainly manifested in
Following aspects：
(1) current general pulverized coal injection in blast furnace flouring technology, wherein medium-speed pulverizer have higher efficiency, and to bituminous coal
With in anthracitic Mixture Density Networks milling process have good result, but when use semi-coke instead of anthracite after, due to semi-coke
It can grind that difference of coefficients is larger (semi-coke 40-45, bituminous coal 65-70), and semi-coke is difficult to grind, and bituminous coal has occurred with the Kazakhstan of bituminous coal
Reach granularity requirements and the still larger situation of semi-coke particles, cause milling efficiency low, at the same it is a large amount of be difficult to grind it is thick and stiff
Semi-coke particles are discharged from the cinder cleaning hole of medium-speed pulverizer lower part, influence coal dust formulated component, waste raw material and improve production cost.
(2) Ramsbottom carbon powder made of current system is utilized, it is bright to find that its microstructure shows by Observation of Histological Structure
Aobvious sharp corners, this makes Ramsbottom carbon powder be more than the abrasive effect of cloth bag collection machine, conveyance conduit and spray gun from far away
Bituminous and anthracite powder causes the relevant device military service period to be greatly reduced, to affect production efficiency, improves and be produced into
This, while increasing certain safety in production hidden danger risk.
(3) powder manufacturing apparatus that ball mill is widely used as the eighties in last century can be passivated semi-coke to a certain extent
The sharp edges of powder improve the abrasion condition of equipment, but the energy consumption of ball mill is big, its energy consumption of processing like products is middling speed
Three times of mill, the working efficiency of another aspect ball mill is too low, only 1/3 or so of medium-speed pulverizer, it is difficult to meet current production
Demand has been eliminated.
Therefore, it is badly in need of the blast furnace blowing flouring technology to currently used semi-coke as injection raw material and is designed improvement, from
And realize the commercial Application for using semi-coke to carry out blast furnace blowing as raw material.
Invention content
For the defects in the prior art, a kind of using semi-coke as blast furnace blowing raw material system present invention aims at providing
The method of standby pulverized coal injection in blast furnace to solve the problems, such as that there are semi-coke grinding difficulties in prior art, and improves semi-coke particles
Corner angle sharpness, so that its edge is become round and smooth, to alleviate the abrasion condition during follow-up injection to conveying blowing device.
To achieve the above object, technical solution provided by the invention is：
The present invention provides a kind of methods preparing pulverized coal injection in blast furnace, are used as using semi-coke (semicoke) and prepare blast furnace blowing
The raw material of coal dust；And before semi-coke is completed final powder processed by medium-speed pulverizer, including that semi-coke is prepared separately into semi-coke is prefabricated
The step of powder.
Preferably, the granularity of the prefabricated powder of semi-coke<3mm.
Preferably, in the step of semi-coke prefabricated powder being prepared separately into semi-coke, the grinding machine used is ball mill.
Preferably, in the step of semi-coke prefabricated powder being prepared separately into semi-coke, the grinding machine used is medium-speed pulverizer.
Preferably, in the step of semi-coke prefabricated powder being prepared separately into semi-coke, the grinding machine used is Raymond mill.
Preferably, further include mixing the prefabricated powder of semi-coke and anthracite before semi-coke being completed final powder processed by medium-speed pulverizer
The step of conjunction.
Preferably, further include mixing the prefabricated powder of semi-coke and bituminous coal before semi-coke being completed final powder processed by medium-speed pulverizer
The step of.
Preferably, further include by the prefabricated powder of semi-coke and anthracite, cigarette before semi-coke being completed final powder processed by medium-speed pulverizer
The step of coal mixes.
Preferably, in the semi-coke mixed coal powder after being ground by medium-speed pulverizer, granularity is less than the particle of 0.0750mm (- 200 mesh)
Content is higher than 70%.
The present invention also protects the pulverized coal injection in blast furnace being prepared using the above method.It should be noted that every use
In method provided by the invention prepares pulverized coal injection in blast furnace all and should belong to the scope of protection of the present invention.
Technical solution provided by the invention has following advantageous effect：(1) provided by the invention to prepare pulverized coal injection into blast furna
Semi-coke is replaced anthracite as blast furnace blowing raw material, can reduce production cost by the method for powder；(2) provided by the invention
The method for preparing pulverized coal injection in blast furnace improves what semi-coke present in the coal dust flouring technology of current blast furnace blowing was difficult to grind
Situation improves semi-coke utilization rate and production efficiency；(3) method provided by the invention for preparing pulverized coal injection in blast furnace, reduces orchid
The corner angle sharpness of charcoal particle alleviates its abrasion during conveying, injection to receipts powder cloth bag, conveyance conduit and spray gun,
Conveying blowing device and the military service cycle phase of blowing bituminous coal anthracite mixed coal powder is set to work as.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
Fig. 1 is the method flow that pulverized coal injection in blast furnace is prepared using semi-coke as blast furnace blowing raw material provided in the present invention
Schematic diagram；
Fig. 2 is metabituminous coal anthracite mixed coal powder displaing micro photo figure of the present invention；
Fig. 3 is semi-coke bituminous coal mixed coal powder displaing micro photo figure in the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes.The following examples are only intended to illustrate the technical solution of the present invention more clearly, therefore is intended only as example, without
It can be limited the scope of the invention with this.
Experimental method in following embodiments is unless otherwise specified conventional method.Examination as used in the following examples
Material is tested, is to be commercially available from regular shops unless otherwise specified.Quantitative test in following embodiment, is respectively provided with three
Secondary to repeat to test, data are the average value or mean+SD of three repeated experiments.
As shown in Figure 1, the present invention provides a kind of method preparing pulverized coal injection in blast furnace, including step：
Semi-coke is individually ground using grinding machine, granularity is prepared<The prefabricated powder of semi-coke of 3mm；Wherein, grinding machine is selected from
It is one or more in ball mill, medium-speed pulverizer and Raymond mill；
The prefabricated powder of semi-coke is mixed with anthracite and/or bituminous coal, is then fed into medium-speed pulverizer and carries out final grinding, after making mill
Semi-coke mixed coal powder in, granularity less than 0.0750mm (- 200 mesh) granule content be higher than 70%；
Semi-coke mixed coal powder is used for blast furnace blowing, obtains pulverized coal injection in blast furnace.
The method provided by the invention for preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke has and improves ring
Protect benefit, optimization Fine coal performance, extend service life of equipment and increase various effects such as economic benefit, be specifically described as
Under.
1, environmental benefit
Semi-coke is the product after distillation process, is a kind of clean energy resource that country widelys popularize, and semi-coke replaces coal pair
Environmental protection is significant, and various regions government also repeatedly emphasizes that semi-coke is substituted using the emphasis as " coal changes clean energy resource ".And this
Invention can be finally to realize that semi-coke substitutes coal realization and coalification is gone to establish good basis completely in system of blast furnace injection.
2, Fine coal performance
(1) technical indicator
Mixing coal for blast furnace blowing volatile matter is ideal between 20-25%, and table 1 closes for current blast furnace injection coal powder
The technical indicator of reason.
The requirement of 1 pulverized coal injection in blast furnace standard of table
| Project | Ash content % | Volatile matter % | Fixed carbon % | Sulphur content % | Kazakhstan can grind coefficient |
| Index request | ≤9 | 20±1 | 70-75 | ≤0.45 | 60 |
Using all technical such as 2 institute of table for the different batches mixed coal powder that method provided by the invention is prepared
Show.
2 semi-coke mixed coal powder technical indicator of table
| Coal | Ash content % | Volatile matter % | Fixed carbon % | Sulphur content % | Kazakhstan can grind coefficient |
| Semi-coke mixed coal powder 1 | 8.61 | 20.37 | 75.16 | 0.26 | 62.55 |
| Semi-coke mixed coal powder 2 | 7.58 | 21.75 | 72.32 | 0.35 | 61.16 |
| Semi-coke mixed coal powder 3 | 9.38 | 20.21 | 74.71 | 0.27 | 63.94 |
It can be seen that, method provided by the invention, indices comply with standard, and can especially grind coefficient and reach from table 2
To 60 or more, solve the problems, such as that semi-coke is difficult to grind in original production process.
(2) combustibility
The final purpose of pulverized coal injection, which is coal dust, to be fully effectively used in stove, played to the maximum extent with coal
The generation burnt effect for reducing coke ratio.Combustion rate index of the coal dust before air port determines the degree that coal dust efficiently uses in stove.Table 3
Combustibility to produce two kinds of coals and semicoke Mixture Density Networks to certain large iron and steel enterprise carries out testing research.Experimental condition is：
1150 DEG C, injecting coal quantity 150kg/t of hot blast temperature, granule content of the granularity less than 0.0750mm (- 200 mesh) is higher than in coal dust
70%.
The different burning of coal performances of table 3
| Coal | Produce anthracite | Produce bituminous coal | Semi-coke mixed coal powder |
| Combustion rate % | 25.29 | 66.73 | 62.49 |
| Volatile matter % | 9.24 | 37.09 | 20.37 |
| Ash content % | 10.45 | 9.81 | 9.61 |
Single grade coal flammability test result explanation：Production anthracite because the minimum combustibility of volatile matter is worst, use by production
Bituminous coal belongs to high volatile, the coal compared with low ash content, and combustibility is best.Semi-coke mixed coal powder is then since ash content is low, tool
There are medium volatile matter content, combustibility to reach preferable level.The wherein combustion rate of semi-coke mixed coal powder and production bituminous coal
It is little compared to gap.Therefore semi-coke mixed coal powder can access sufficiently effective utilization for blast furnace blowing in stove, into one
It is highly beneficial that step carries high-coal ratio reduction ratio of putting coke into furnace.
3, service life of equipment
When processing semi-coke mixed coal powder using the flouring technology for being currently used in blast furnace blowing, due to the tissue shape of Ramsbottom carbon powder
Formula more show tip-angled shape, pair with relevant device abrasion it is extremely serious, by taking certain large iron and steel enterprise as an example, use bituminous coal and nothing
When bituminous coal mixed coal powder is blown, since bituminous and anthracite mixed coal powder organizational form is more round and smooth, the replacement of injection system spray gun
Period is 90 days, and when being blown semi-coke mixed coal powder, replacement cycle of spray gun is 30 days, and used method provided by the invention into
After row semi-coke Mixture Density Networks powder, the replacement cycle of spray gun restores to 90 days or so, this is primarily due to through ball mill to semi-coke
Prefabricated powder realize the passivation to its microstructure, eliminate a large amount of existing sharp corners originally.Fig. 2 is bituminous and anthracite
Mixed coal powder displaing micro photo figure (× 16), Fig. 3 are semi-coke bituminous coal mixed coal powder displaing micro photo figure (× 160)；From Fig. 2 and Fig. 3
It can be seen that, although in method provided by the invention semi-coke mixed with bituminous coal and coal dust there are still it is a small amount of sharply corner feelings
Condition, but be not much different with the form of bituminous and anthracite mixed coal powder, therefore abrasion has also obtained preferable improvement.
4, economic benefit
Since the price of current semi-coke will totally be less than anthracitic price, carried out using method provided by the invention
The production of semi-coke mixed coal powder can generate larger economic interests, and anthracite is 1100 yuan/ton by taking current coal price as an example, and be can be used
It is only 700 yuan/ton in substituting the semi-coke of the product, 50% anthracite of bituminous coal is pressed according to the proportioning of raw coal anthracite mixed coal powder
50% calculates, if replacing anthracite using semi-coke, then mixed coal powder per ton can generate 200 yuan of profit, it is state-owned with certain large size
The 50t/h hours amounts of normal production scenarios of iron and steel enterprise calculate, and prediction year benefit is up to 87,600,000 yuan/year.The invention simultaneously
Coalification is gone to provide strong technology and economic guarantee for final.
Technical solution provided by the invention is described further with reference to specific embodiment.
Embodiment
The present embodiment provides a kind of methods preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke, including step
Suddenly：
By the semi-coke block (technical indicator parameter is as shown in table 4) that granularity is 10mm or so, individually ground using ball mill
The prefabricated powder of semi-coke that granularity is 1.5mm or so is prepared in mill；
By bituminous coal (technical indicator is as shown in table 5) that the prefabricated powder of semi-coke and granularity are 15mm or so according to 1:1 mass ratio
Mixing is then fed into medium-speed pulverizer and carries out final grinding, makes in the semi-coke mixed coal powder (technical indicator is as shown in table 6) after mill,
Granule content of the granularity less than 0.0750mm (- 200 mesh) is higher than 70%；
Semi-coke mixed coal powder is used for blast furnace blowing, obtains pulverized coal injection in blast furnace.
4 semi-coke technical indicator of table
| Coal | Ash content % | Volatile matter % | Fixed carbon % | Sulphur content % | Kazakhstan can grind coefficient |
| Semi-coke | 8.45 | 17.69 | 75.36 | 0.23 | 43.45 |
5 bituminous coal technology index of table
| Coal | Ash content % | Volatile matter % | Fixed carbon % | Sulphur content % | Kazakhstan can grind coefficient |
| Shaanxi Shen Fu bituminous coal | 9.81 | 37.09 | 56.74 | 0.64 | 68.13 |
6 semi-coke mixed coal powder technical indicator of table
| Coal | Ash content % | Volatile matter % | Fixed carbon % | Sulphur content % | Kazakhstan can grind coefficient |
| Semi-coke mixed coal powder | 9.38 | 20.21 | 74.71 | 0.27 | 63.94 |
The present invention increases the step of preparing semi-coke prefabricated powder, the step on the basis of existing blast furnace blowing flouring technology
The semi-coke block of 10mm or so is ground to 3mm hereinafter, being later mixed into the semi-coke particles after prefabricated powder with bituminous coal by grinding machine
Enter medium-speed pulverizer and complete final powder processed, by prefabricated powder process make semi-coke particles and bituminous coal form granularity it is poor (semi-coke 3mm with
Under, bituminous coal 15mm or so), to accelerate the grinding effect of semi-coke particles, solve difficult there are semi-coke grinding in prior art
Problem so that bituminous coal and semi-coke can simultaneous grinding at powder, realize the efficient injection of final blast furnace；Furthermore prepare the prefabricated powder of semi-coke
The corner angle sharpness that semi-coke particles can be improved, makes its edge become round and smooth, this is to alleviating during follow-up injection to conveying
The abrasion of blowing device plays good effect.
It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this hair
The ordinary meaning that bright one of ordinary skill in the art are understood.Unless specifically stated otherwise, it otherwise illustrates in these embodiments
Component and opposite step, numerical expression and the numerical value of step are not limit the scope of the invention.It is illustrated and described herein
In all examples, unless otherwise prescribed, any occurrence should be construed as merely illustrative, not as limitation, because
This, other examples of exemplary embodiment can have different values.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more this feature.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover in protection scope of the present invention.
Claims (10)
1. a kind of method preparing pulverized coal injection in blast furnace, it is characterised in that：
Using semi-coke as the raw material for preparing pulverized coal injection in blast furnace；
And before the semi-coke is completed final powder processed by medium-speed pulverizer, including that semi-coke is prepared separately into the semi-coke is prefabricated
The step of powder.
2. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
The granularity of the prefabricated powder of semi-coke<3mm.
3. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
In the step of semi-coke prefabricated powder is prepared separately into the semi-coke, the grinding machine used is ball mill.
4. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
In the step of semi-coke prefabricated powder is prepared separately into the semi-coke, the grinding machine used is medium-speed pulverizer.
5. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
In the step of semi-coke prefabricated powder is prepared separately into the semi-coke, the grinding machine used is Raymond mill.
6. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
Further include mixing the prefabricated powder of the semi-coke and anthracite before the semi-coke is completed final powder processed by medium-speed pulverizer
Step.
7. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
Further include the step for mixing the prefabricated powder of the semi-coke and bituminous coal before the semi-coke is completed final powder processed by medium-speed pulverizer
Suddenly.
8. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
Further include by the prefabricated powder of the semi-coke and anthracite, bituminous coal before the semi-coke is completed final powder processed by medium-speed pulverizer
The step of mixing.
9. the method according to claim 1 for preparing pulverized coal injection in blast furnace, it is characterised in that：
In semi-coke mixed coal powder after being ground by medium-speed pulverizer, granule content of the granularity less than 0.0750mm is higher than 70%.
10. the pulverized coal injection in blast furnace that claim 1-9 any one of them methods are prepared.
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| CN110982578A (en) * | 2019-11-22 | 2020-04-10 | 南京钢铁股份有限公司 | Blast furnace blowing semi-coke additive and preparation and use method thereof |
| CN111961772A (en) * | 2020-08-19 | 2020-11-20 | 付光临 | Preparation method and application of modified semi coke |
| CN112143841A (en) * | 2020-09-21 | 2020-12-29 | 西安建筑科技大学 | System and method for blast furnace mixed blowing of semi coke |
| CN114106900A (en) * | 2020-08-28 | 2022-03-01 | 上海梅山钢铁股份有限公司 | Semi-coke-containing mixed fuel for blast furnace injection and preparation method thereof |
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| CN110982578A (en) * | 2019-11-22 | 2020-04-10 | 南京钢铁股份有限公司 | Blast furnace blowing semi-coke additive and preparation and use method thereof |
| CN110982578B (en) * | 2019-11-22 | 2021-08-10 | 南京钢铁股份有限公司 | Blast furnace blowing semi-coke additive and preparation and use method thereof |
| CN111961772A (en) * | 2020-08-19 | 2020-11-20 | 付光临 | Preparation method and application of modified semi coke |
| CN114106900A (en) * | 2020-08-28 | 2022-03-01 | 上海梅山钢铁股份有限公司 | Semi-coke-containing mixed fuel for blast furnace injection and preparation method thereof |
| CN112143841A (en) * | 2020-09-21 | 2020-12-29 | 西安建筑科技大学 | System and method for blast furnace mixed blowing of semi coke |
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