CN113717742B - Coal blending system for blending alkali metal coking coal and coking method - Google Patents
Coal blending system for blending alkali metal coking coal and coking method Download PDFInfo
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Abstract
The application relates to the technical field of coking, in particular to a coal blending system for blending alkali metal coking coal and a coking method. The coal blending system comprises the following components in percentage by mass: main coking coal: 58% -67%, fat coal: 20% -23%, 1/3 coking coal: 0% -15%, lean coal: 7% -9%, alkali metal coking coal: 3% -7%; the ash component of the coal blending system comprises the following components in percentage by mass: the first alkali metal is 1.1-1.6%, and the first alkaline earth metal is less than 3%. The mass fraction of the first alkali metal and the mass fraction of the first alkaline earth metal are controlled, compatibility of different coking coals is researched, the alkali metal coking coal is doped into a coal blending system to enter a blast furnace for coking, and the thermal strength (coke reactivity CRI and post-reaction strength CSR) of the obtained coke is in a standard range.
Description
Technical Field
The application relates to the technical field of coking, in particular to a coal blending system for blending alkali metal coking coal and a coking method.
Background
As China has abundant coal resources, the proportions of various varieties are not harmonious in the yield of coking coal in China. In coal blending coking, the fat coal and the coking coal generally account for 50-80%, but in practice, the total yield of the Chinese coking coal and the fat coal accounts for less than 28% of the total amount of the coking coal, and particularly, the Chinese coking coal and the fat coal are generally low in selectivity, relatively weak in coking property and low in metamorphism degree, so that the ratio of the coking coal to the fat coal in the coking coal is seriously insufficient.
At present, a large amount of 1/3 coking coal and partial gas coal are frequently added for coking, and the ratio of the coking coal to the fat coal is insufficient, so that the quality of the produced metallurgical coke cannot meet the coking requirement of a large blast furnace. Therefore, the demand can be met only by buying imported coking coal with good cohesiveness in China. In recent years, with the increasing demand of coking coal in China year by year, imported coking coal such as Australia, canada, mongolia and the like becomes an important component in coking coal blending in China. As a replaceable imported coal resource, the American coking coal belongs to the coking coal containing alkali and/or alkaline earth metals due to the nature of the American coking coal, and brings great difficulty to the industrial application of the imported coal.
Disclosure of Invention
The application provides a coal blending system and a coking method for blending alkali metal coking coal, which aim to solve the technical problem that the coke for a large blast furnace cannot be satisfied due to poor heat strength of alkali and/or alkaline earth metals.
In a first aspect, the present application provides a coal blending system for blending alkali metal coking coal, the components of the coal blending system comprise, in mass fraction: main coking coal: 58% -67%, fat coal: 20% -23%, 1/3 coking coal: 0% -15%, lean coal: 7% -9%, alkali metal coking coal: 3% -7%; the ash component of the coal blending system comprises the following components in percentage by mass: the first alkali metal accounts for 1.1-1.6%, and the first alkaline earth metal is less than 3%.
Optionally, the first caking index of the coal blending system is more than 75, the thickness of the first colloid layer is 15mm to 18mm, the first Australian expansion degree is 10 percent to 30 percent, and the fluidity (MF) is 1000 ddmp to 12000ddmp.
Optionally, in the coal blending system, the components with the particle size of less than or equal to 3mm account for 72-76% of the total mass of the coal blending system.
Optionally, the ash component of the alkali metal coking coal comprises, by mass fraction: a second alkali metal >2%, and/or a second alkaline earth metal >10%; the second dry ashless base has a volatile matter of 18 to 21%.
Optionally, the maximum second vitrinite reflectance of the alkali metal coking coal is 1.1-1.6%, the second bonding index is larger than 80, the thickness of the second colloidal layer is 12-18 mm, and the second Austenite degree of expansion is 30-50%.
In a second aspect, the present application provides a coking method with alkali coking coal, the method comprising the steps of:
obtaining components of the coal blending system;
mixing and crushing the components of the coal blending system according to a proportion; sequentially coking, discharging coke and cooling the coal blending system to obtain coke;
the coking temperature is 1150-1250 ℃, and the coking time is 29-33 h.
Optionally, the compressive strength of the coke is more than or equal to 89MPa, the wear-resisting strength is less than or equal to 6%, the reactivity of the coke is less than or equal to 22.0%, and the strength after reaction is more than or equal to 70%.
Optionally, the cooling is by dry quenching.
An application of the coal blending system in coal blending coking.
Optionally, the application comprises the coal blending system is used for blast furnace coking.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method provided by the embodiment of the application, the alkali metal coking coal and other components are mixed in proportion to obtain a coal blending system, in the coal blending system, the mass fraction of the first alkali metal and the mass fraction of the first alkaline earth metal in the coal blending system are controlled, through research on compatibility of different coking coals, a coal blending technology involving the alkali metal coking coal is used, the coking coal blending proportion is optimized, other parameters of the coal blending system are controlled, the alkali metal coking coal is blended into the coal blending system to enter a blast furnace for coking, the thermal strength (the coke reactivity CRI and the post-reaction strength CSR) of the obtained coke is within a standard range (CSR & gt 69), the coke-using requirement of a large blast furnace is met, and the alkali metal coking coal can be widely applied to industrial production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a coking method using alkali metal coking coal according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a coal blending system for blending alkali metal coking coal, which comprises the following components in percentage by mass: main coking coal: 58% -67%, fat coal: 20% -23%, 1/3 coking coal: 0% -15%, lean coal: 7% -9%, alkali metal coking coal: 3% -7%; the ash component of the coal blending system comprises the following components in percentage by mass: the first alkali metal accounts for 1.1-1.6%, and the first alkaline earth metal is less than 3%.
In the embodiment of the application, the main coking coal can be classified according to the classification method of GB 5751-86, the types of fat coal, 1/3 coking coal and lean coal can be classified according to the classification method of GB 5751-86, and the alkali metal coking coal can be the coking coal imported from America or the coking coal containing alkali metal and/or alkaline earth metal.
In the embodiment of the application, a proper coal blending system control index is taken to reasonably replace the blending proportion of domestic coking coal and fat coal, and the alkali metal coking coal is blended, so that the cost of the coal blending system is reduced under the condition of meeting a certain quality requirement of the coal blending system, high-quality metallurgical coke with stable quality can be produced on a top-loading coke oven, the technical problems that the alkali metal coking coal is difficult to apply industrially and cannot meet the coking requirement of a large blast furnace are solved, and the extension of the range of available coking coal resources in China is facilitated.
In the examples of the present application, the first dry ashless-based volatile matter: 22 to 25 percent.
As an alternative embodiment, the first caking index of the coal blending system is more than 75, the thickness of the first colloid layer is 15mm to 18mm, the first Australian expansion degree is 10 percent to 30 percent, and the fluidity (MF) is 1000 ddmp to 12000ddmp.
In the embodiment of the application, the coal blending technology with the participation of the alkali metal coking coal provides an optimized coking coal blending proportion through the compatibility research of different coking coals, and coke produced by a top-loading coke oven can meet the quality requirement of high-quality metallurgical coke through the control on the equivalent of a coal blending system G, MCI and MF.
As an optional implementation mode, in the coal blending system, the components with the particle size less than or equal to 3mm account for 72-76% of the total mass of the coal blending system.
In the embodiment of the application, the component proportion of the particles with the particle size of less than or equal to 3mm is controlled, so that the beneficial effect of ensuring full bonding among coal particles is achieved, and if the proportion is reduced, the adverse effect of coke quality deterioration is brought.
As an alternative embodiment, the ash component of the alkali metal coking coal comprises, in mass fraction: a second alkali metal >2%, and/or a second alkaline earth metal >10%; the second dry ashless base has a volatile matter of 18 to 21%.
In the embodiment of the present application, the mass fraction of the second ash is 5.0 to 10.0%, and in the second ash of the alkali metal coking coal, the mass fraction of the second alkali metal is more than 2%, and the mass fraction of the second alkaline earth metal is more than 10%.
In the embodiment of the application, the mass fraction of the second alkali metal and the mass fraction of the second alkaline earth metal in the second ash are controlled, so that the mass fraction of the alkali metal coking coal in the coal blending system is determined, the basic parameters of the coal blending system are controlled conveniently, and the top-loading coke oven can produce high-quality metallurgical coke with stable quality.
As an alternative embodiment, the maximum second vitrinite reflectance of the alkali metal coking coal is 1.1 to 1.6 percent, the second bonding index is more than 80, the thickness of the second colloidal layer is 12mm to 18mm, and the second Austenite degree is 30 percent to 50 percent.
In the embodiment of the application, the thermal property of the coke is mainly determined by the optical structure, the porosity and the mineral catalytic index of the coke, and the properties are directly related to various properties of the raw material coal, such as the congenital property of the raw material coal, the compatibility of a coal blending system and the coking process condition, but the factors are not isolated and influence and act together. The maximum second vitrinite reflectivity, the thickness of the second colloid layer and the second Australian expansion degree of the alkali metal coking coal are controlled, so that the quality of a coal blending system is ensured, and high-quality metallurgical coke with stable quality is produced conveniently.
In a first aspect, the present application provides a coking process with alkali coking coal, as shown in FIG. 1, comprising the steps of:
s1, obtaining components of the coal blending system;
s2, mixing and crushing the components of the coal blending system in proportion; s3, sequentially coking, discharging coke and cooling the coal blending system to obtain coke;
the coking temperature is 1150-1250 ℃, and the coking time is 29-33 h.
In the embodiment of the application, coal proportion is 58% -67%, fat coal proportion is 20% -23%, one third coking coal is 0% -15%, lean coal is 7% -9%, and the blending proportion of the alkali metal coking coal is 3% -7% after the coal blending components are fully mixed, the mixture is crushed by a hammer crusher; then the coke is sent into a top-loading coke oven with the diameter of 7.63m, the coking temperature is 1150-1250 ℃, and the coking time is 31 +/-2 hours.
In the embodiment of the application, the reason for controlling the coking temperature to 1150-1250 ℃ is to ensure that the coke is mature, the temperature is too high, the adverse effect of the service life of refractory materials in the coke oven is easily reduced, and the temperature is too low, so that the adverse effect of coke formation cannot be bonded; the reason for controlling the coking time to be 29-33 h is to ensure that the coke is mature, the time is too long, the adverse effect of coke loss caused by over-mature of the coke is caused, and the time is too short, the adverse effect of coke strength caused by under-mature of the coke is caused;
as an optional embodiment, the compressive strength of the coke is more than or equal to 89MPa, the abrasion resistance (M40) is less than or equal to 6 percent, the reactivity (CRI) of the coke is less than or equal to 22.0 percent, and the strength (CSR) after reaction is more than or equal to 70 percent.
The crushing strength of the coke obtained by coal blending and coking by the method is 89-92 percent, the wear resistance is 4-6 percent, the reactivity of the coke is 18-21 percent, and the strength of the coke after reaction is 69-73 percent, so that the crushing strength can meet the requirement of 5000m 3 And above the coke requirement for blast furnaces.
As an alternative, the cooling may be by dry quenching.
In the application, after coke discharging, dry quenching is carried out, and nitrogen or inert gas can be used for cooling; and (3) after quenching coke, determining coke quality indexes including ash content, volatile matters, abrasion resistance, crushing strength, coke reactivity, coke reaction strength after reaction and the like of the coke.
An application of the coal blending system in coal blending coking.
As an alternative embodiment, the application comprises using the coal blending system in blast furnace coking.
The coal blending system of the example group and the comparative example group comprises the following components:
the alkali metal coking coal is not added in the comparative example 1, the alkali metal coking coal is directly used in the comparative example 2, 3 percent, 5 percent and 7 percent of the alkali metal coking coal are added in sequence in the examples 1 to 3, and the coal blending coking is carried out by applying a 7.63m top-loading coke oven. The coking method of the comparative example group is the same as that of the example group except that the coal blending system has different components. The coal blending protocol is detailed in table 1.
A coal blending and coking method for blending alkali metal coking coal comprises the following steps:
a. the components of the coal blending system of the example and the comparative example are respectively obtained
b. B, fully mixing the blended coal in the step a, and crushing by using a hammer crusher;
c. the crushed mixed coal is sent into a top-loading coke oven with the diameter of 7.63m, the coking temperature is 1200 +/-50 ℃, and the coking time is 31 +/-2 h
d. Performing dry quenching after coke discharging;
e. after quenching, coke quality indexes including ash content, volatile components, abrasion resistance (M40), crushing strength (M10), coke Reactivity (CRI), coke after-reaction strength (CSR) and the like of the coke are measured.
In the embodiment of the invention, a 7.63m top-mounted coke oven is adopted, and the coal blending coking is carried out by using alkali metal coking coal, and the coal blending is dry and has no ash-based volatile component (V) d af) is 22-25%, the bonding index (G) is more than 75, the thickness (Y) of the colloidal layer is 15-18 mm, and the Australian expansion degree (b) is 10-30%. Alkali metal (K) 2 O+Na 2 O) content is 1.1-1.6%, alkaline earth metal (CaO) content is less than 3%, and fineness is 72-76%.
TABLE 1 blending quality and corresponding Coke quality for inventive examples
As can be seen from Table 1, the coke quality after blending the alkali metal coking coals in different proportions according to the method of the present invention is substantially similar to that without blending the alkali metal coking coals, but the Coke Reactivity (CRI) and the coke post-reaction strength (CSR) in the coke qualities of examples 1 to 3 and comparative example 1 can satisfy 5000m 3 And the coke requirement for the blast furnace is met, and in the comparative example 2, the crushing strength of the alkali metal coking coal on the surface is 86-89%, the wear resistance is 5% -percent, and the cold strength is better. But the coke reactivity is 70-72%, the strength after reaction is 7-12%, and the coke requirement for the blast furnace cannot be met.
It is noted that, in this document, relational terms such as "second" and "first" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A coal blending system for blending alkali metal coking coal is characterized in that the components of the coal blending system comprise the following components in percentage by mass: main coking coal: 58% -67%, fat coal: 20% -23%, 1/3 coking coal: 0% -15%, lean coal: 7% -9%, alkali metal coking coal: 3% -7%; the ash component of the coal blending system comprises the following components in percentage by mass: 1.1 to 1.6 percent of first alkali metal and less than 3 percent of first alkaline earth metal;
the first caking index of the coal blending system is more than 75, the thickness of the first colloid layer is 15 mm-18 mm, the first Australian expansion degree is 10% -30%, and the fluidity is 1000-12000 ddmp;
in the coal blending system, the components with the particle size less than or equal to 3mm account for 72-76% of the total mass of the coal blending system;
the ash component of the alkali metal coking coal comprises the following components in percentage by mass: a second alkali metal >2%, and/or a second alkaline earth gold
Belongs to more than 10 percent; the second dry ash-free base volatile component is 18-21%;
the maximum second vitrinite reflectivity of the alkali metal coking coal is 1.1-1.6%, the second bonding index is greater than 80, the thickness of the second colloid layer is 12-18 mm, and the second Australian expansibility is 30-50%.
2. A coking method of the coal blending system according to claim 1, characterized in that the method comprises the steps of:
obtaining components of the coal blending system;
mixing and crushing the components of the coal blending system according to a proportion;
sequentially coking, discharging coke and cooling the coal blending system to obtain coke;
the coking temperature is 1150-1250 ℃, and the coking time is 29-33 h.
3. The method of claim 2, wherein the coke has a compressive strength of 89MPa or more, a wear strength of 6% or less, a coke reactivity of 22.0% or less and a post-reaction strength of 70% or more.
4. The method of claim 2, wherein the cooling is by dry quenching.
5. Use of a coal blending system according to claim 1 or a method according to any one of claims 2 to 3 for coal blending coking.
6. The use of claim 5, comprising using the coal blending system in blast furnace coking.
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| GB414368A (en) * | 1932-10-26 | 1934-07-26 | Arthur A Roberts | Improvements relating to the manufacture of fuel briquettes from carbonaceous material |
| US5364421A (en) * | 1991-07-31 | 1994-11-15 | Ziegler Coal Holding Company | Coal blends having improved ash viscosity |
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| CN104232131B (en) * | 2013-06-17 | 2016-08-10 | 上海梅山钢铁股份有限公司 | The coke of a kind of adapted Canada coking coal and coking process |
| CN105219412A (en) * | 2014-06-24 | 2016-01-06 | 上海梅山钢铁股份有限公司 | A kind of coke of adapted Australian coking coal and coking process |
| CN104946286B (en) * | 2015-05-26 | 2017-06-16 | 武汉钢铁(集团)公司 | Low volatile coking coal participates in coal-blending coking method |
| CN108664450B (en) * | 2017-03-29 | 2022-05-20 | 鞍钢股份有限公司 | Coke quality prediction method based on high potassium and sodium contents of coal ash |
| CN112980482B (en) * | 2021-03-05 | 2022-04-01 | 宁波钢铁有限公司 | Method for coking with American coking coal participating in coal blending |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB414368A (en) * | 1932-10-26 | 1934-07-26 | Arthur A Roberts | Improvements relating to the manufacture of fuel briquettes from carbonaceous material |
| US5364421A (en) * | 1991-07-31 | 1994-11-15 | Ziegler Coal Holding Company | Coal blends having improved ash viscosity |
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