CN113637495A - Method for controlling particle size of crushed coal by double-line coal blending - Google Patents
Method for controlling particle size of crushed coal by double-line coal blending Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
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Abstract
The invention discloses a method for controlling particle size of crushed coal by double-line coal blending, which mainly solves the technical problem of uneven particle size of the crushed coal by double-line coal blending in the prior art. The technical scheme of the invention is as follows: a method for controlling particle size of crushed coal by double-line coal blending comprises the following steps: 1) classifying the single coking coal, and performing screening and caking property tests on the single coking coal, wherein the single coking coal with the fluidity MF of less than or equal to 100ddpm or the single coking coal with the particle size of less than or equal to 3mm accounts for less than or equal to 60 percent of the total mass of the single coking coal is the coal of type A, and the single coking coal with the fluidity MF of more than 100ddpm and the particle size of less than or equal to 3mm accounts for more than 60 percent of the total mass of the single coking coal is the coal of type B; 2) blending coal with single coking coal; 3) crushing the blended coal; 4) mixing with coal. The method of the invention improves the uniformity of coking coal, reduces the coal blending cost and further improves the coke quality.
Description
Technical Field
The invention relates to a method for manufacturing coal for coke manufacturing, in particular to a method for controlling particle size of crushed coal by double-line coal blending, belonging to the technical field of coal blending and coking.
Background
In the coal blending and coking process, blended coal is mixed by coal types with different properties, generally strong caking coking coal and fat coal are easier to crush, while weak caking gas coal and lean coal are harder to crush, so that particle size segregation is often caused by crushing the blended coal together. The coking process is a process from adding the blended coal into a coke oven to isolate air and heating the high-temperature carbonization to coke maturity, and the softening and melting are insufficient in the coking process due to the segregation of the particle size of the blended coal, so that the coke quality is influenced.
The grant publication No. CN201908069U discloses a crushing system for coking clean coal, which adopts graded crushing to screen clean coal, and conveys undersize coal dust which is not beneficial to coking to a coal dust bin, and directly conveys coal particles suitable for coking to a coal dust storage bin for coking, and conveys larger-particle clean coal to a crusher for crushing. The system adopts the classification crushing to ensure the uniform particle size, but the classification difficulty is higher under the condition of larger coal moisture, so the system is not beneficial to smooth production.
The Chinese patent document of application publication No. CN108117879A discloses a coal blending method of partial humidity-adjusting grading crushing, according to the hardness difference and particle size requirement of each coal and rock phase composition participating in coal blending coking, a part of harder coking coal is pre-crushed once and then is put into a matching groove, single coal in the matching groove is quantitatively cut out and matched, then the single coal enters a screening device for screening, screening is carried out according to the particle size of 5mm, coarse-particle coal on the screen is conveyed for secondary crushing, and the crushed coal is less than 3mm and can reach 83 +/-2% of charging coal specification; conveying the screened fine-particle coal to a coal humidifying system to humidify and remove part of water, and achieving 68% of control requirement; and the coarse-particle coal after secondary crushing and the fine-particle coal after coal moisture control enter a coal mixer together to be mixed and then are sent into a coke oven coal tower. The invention optimally combines the crushing, screening and humidifying processes of coking coal, controls the moisture of the coal through coal humidifying, facilitates the screening, further optimizes the particle size distribution, but has relatively complex process.
The Chinese patent document with application publication number CN102517057A discloses a coal moisture control method for classifying, crushing and mixing coal, which comprises the steps of respectively taking materials from a plurality of coal material fields, respectively conveying single coal powder by belts, and respectively carrying out coal moisture control treatment on the single coal material; respectively feeding the single coal material subjected to coal moisture control into particle size grading equipment; respectively feeding the single coal material with coarse grains into a pulverizer to be pulverized; crushing the coarse particles and mixing the crushed coarse particles with the same kind of fine coal; the mixed single coal materials are respectively sent into a coal blending groove by a belt conveyor to be blended; and conveying the mixed coal after coal blending to a blending device through a belt, and then entering a coal bunker. The invention patent carries out coal moisture control and selective crushing in the process of conveying single coal to a coal blending tank, fully exerts the properties of the single coal, further optimizes the particle size distribution and improves the coke quality. However, the invention has complex process, needs a plurality of crushing systems for a plurality of coal types and has great difficulty in realization.
The Chinese patent document with application publication number CN105670669A discloses a coal blending method for preventing coke strength deterioration by double-line coal blending, which designs a main ratio according to the coal quality characteristics of a mine point and a coke quality control target, divides the main ratio into two sub ratios according to the caking property and coking property of each coal in the main ratio, and then performs crushing and uniform mixing, wherein the caking property and the coking property of the coal in the two sub ratios are the same or close to each other. The invention uses the double-line coal blending according to two single-line coal blending, and does not play the role of adjusting the particle size uniformity of the double-line coal blending.
The existing coal blending processes have the following defects that step crushing is adopted in all of patent 1, patent CN201908069U and patent CN108117879A, and the energy consumption of crushing can be reduced by step crushing, but the screening of coal classification is difficult when the moisture content is large, and dust is large when the moisture content of coal is low. In addition, grading equipment is required to be added for grading crushing; 2. the patent CN102517057A adopts classification crushing, wherein the classification crushing is to crush different single coals respectively and mix the crushed coals, and because the coking coals used for coal blending are various, the number of crushers is increased for classification crushing, so that the equipment investment is greatly increased; 3. patent CN102517057A adopts two-line coal blending, uses two-line coal blending as two separate single-line coal blending, and can not play the role of two-line coal blending.
Disclosure of Invention
The invention aims to provide a method for controlling the particle size of crushed coal by double-line coal blending, which mainly solves the technical problem of uneven particle size of the crushed coal by double-line coal blending in the prior art.
The technical idea of the invention is that the coking coal is classified by utilizing the advantages of double-line coal blending and double crushers, the crushing fineness of the crushers is respectively adjusted, the particle size homogenization degree is improved, the particle size segregation is reduced, the respective coking coal advantages are brought into play, and the coke quality is improved.
The technical scheme adopted by the invention is that the double-line coal blending comprises a coal blending line A and a coal blending line B which respectively comprise a coal blending groove, a conveying belt and a crusher.
The technical scheme of the invention is that a method for controlling the particle size of crushed coal by two-line coal blending, each coal blending line is provided with a coal blending groove, a conveying belt and a crusher, and the method comprises the following steps:
1) classifying the single coking coal, and performing screening and caking property tests on the single coking coal, wherein the single coking coal with the fluidity MF of less than or equal to 100ddpm or the single coking coal with the particle size of less than or equal to 3mm accounts for less than or equal to 60 percent of the total mass of the single coking coal is the coal of type A, and the single coking coal with the fluidity MF of more than 100ddpm and the particle size of less than or equal to 3mm accounts for more than 60 percent of the total mass of the single coking coal is the coal of type B;
2) blending coal with single coking coal, blending the A-type coal with a 1# coal blending line, transferring the A-type coal to the 1# coal blending line, and blending the coal through different coal blending slots according to the coking coal blending mass ratio to obtain blended coal A; blending B type coal by using a No. 2 coal blending line, transferring the B type coal to the No. 2 coal blending line, and blending coal by different coal blending tanks according to the coking coal blending mass ratio to obtain blended coal B;
3) crushing the blended coal, namely crushing the blended coal A by using a crusher of a No. 1 coal blending line, and controlling the crushed single coking coal with the particle size of less than or equal to 3mm to account for 78-80% of the total mass of the single coking coal; crushing the blended coal B by using a crusher of a No. 2 coal blending line, and controlling single coking coal with the particle size of less than or equal to 3mm to account for 76-78% of the total mass of the crushed blended coal B;
4) mixing the blended coal, fully mixing the crushed blended coal A and the crushed blended coal B to obtain the total blended coal, and conveying the total blended coal to a coal bunker at the top of a coke oven through a belt to be coked.
Further, the coking and coal blending mass ratio in the step 2) is as follows: 35-40% of coking coal, 20-25% of fat coal, 12-17% of gas coal, 5-8% of lean coal, 17-23% of 1/3 coking coal, 25-26% of coal blending volatile component Vd and 78-82% of coal blending caking index.
The invention discloses a method for homogenizing particle sizes of double-line blended coal, which is characterized in that an applicant finds that whether the particle sizes of the blended coal are uniform or not can obviously influence the coke quality through a large number of tests, and if the particle sizes are not uniform, the full fusion of a coking process is difficult to ensure in the coking process.
The coking coal is divided into strong caking coking coal and weak caking coking coal, wherein the grain diameter of the strong caking coking coal cannot be too fine, the coking coal with the grain diameter less than or equal to 0.5mm is reduced as much as possible, otherwise the caking property is damaged, and the caking property of the coal is reduced; the special particle size of the weakly caking coking coal is required not to be too large, otherwise, the inert substances cannot be melted in the coking process, and a crack degradation center is easily formed; if the strong caking coal with small particle size and the weak caking coal with large particle size are crushed together, the result is that the strong caking coal is excessively crushed and the particle size of the weak caking coal is excessively large, which causes the quality of coke to be reduced, or the ratio of the strong caking coal is increased to ensure that the coking process is fully fused, which causes the coking cost of coal blending to be increased and the quality of coke to fluctuate.
Therefore, the method for homogenizing the particle size of the double-line coal blending is adopted, and the advantage of the double-line coal blending on particle size adjustment is fully exerted, so that the coke quality is stabilized, and the coal blending cost is reduced.
The invention utilizes the existing double-line coal blending system to classify and crush the blended coal under the condition of not increasing investment, so that the particle size distribution is more reasonable, and the function of exerting the advantages of respective coking coals is achieved.
Compared with the prior art, the invention has the following positive effects: 1. the method of the invention gives full play to the function of coal with different quality in coking, adopts different crushers to crush, improves the uniformity of the particle size of coking coal, and reduces the coal blending cost. 2. The method of the invention is beneficial to preventing the over-crushing of the strong caking coal, thereby reducing the generation of the superfine coal powder which is not beneficial to coking, and further improving the coke quality.
Detailed Description
The present invention is further illustrated by the following specific examples, which are shown in tables 1 and 2.
Example 1, a coking coal for a certain iron and steel company includes 10 varieties including FM1, FM2, JM1, JM2, JM3, SJ1, SJ2, QM1, QM2 and SM.
A method for controlling particle size of crushed coal by double-line coal blending, wherein each coal blending line is provided with a coal blending groove, a conveying belt and a crusher, and comprises the following steps:
1) classifying single coking coals, and performing screening and caking property tests on the single coking coals, wherein the single coking coals with the fluidity MF of less than or equal to 100ddpm or the single coking coals with the grain diameter of less than or equal to 3mm accounting for less than or equal to 60 percent of the total mass are A-type coals and comprise SJ1, SJ2, QM1, QM2 and SM, the single coking coals with the fluidity MF of more than 100ddpm and the grain diameter of less than or equal to 3mm accounting for more than 60 percent of the total mass are B-type coals and comprise JM1, JM2, JM3, FM1 and FM 2;
2) coal blending is carried out on single coking coal, SJ1, SJ2, QM1, QM2 and SM serving as A-class coal types are conveyed to a coal blending line A, and coal blending is carried out through different coal blending tanks according to the mass ratio of coking coal blending to obtain blended coal A; conveying JM1, JM2, JM3, FM1 and FM2 serving as B-type coal types to a coal blending line B, and blending coal through different coal blending tanks according to the mass ratio of coking and blending coal to obtain blended coal B; the coking and coal blending mass ratio is as follows: QM 16%, QM 28%, SM 5%, SJ 19%, SJ 211%, JM 114%, JM 213%, JM 312%, FM 111%, FM 211%; the blending coal volatile component is 25.6 percent, and the blending coal caking index is 82;
3) crushing the blended coal, conveying the blended coal A to a crusher A for crushing, adjusting the number and the rotating speed of hammers of the crusher A to obtain the crushed blended coal A, and controlling the coking coal with the particle size of less than or equal to 3mm to account for 78.9 percent of the total mass of the crushed coking coal; conveying the blended coal B to a crusher B for crushing, adjusting the number and the rotating speed of hammers of the crusher B to obtain crushed blended coal B, and controlling coking coal with the particle size of less than or equal to 3mm to account for 76.6 percent of the total mass of the crushed blended coal B;
4) and mixing the blended coal, fully mixing the coal in the crushed coal blending line A and the crushed coal blending line B to obtain the total blended coal, wherein the total mass of the coking coal with the particle size of less than or equal to 3mm after the total blended coal is crushed accounts for 77.7 percent, and conveying the coking coal to a coal bunker at the top of a coke oven through a belt for coking.
The total blended coal is charged into a 7m top coke oven for coking, the coking time is 22h, the coke is obtained, the metallurgical coke is obtained by dry quenching cooling at 190t/h, and the quality of the metallurgical coke is analyzed and shown in Table 2.
Example 2, a coking coal for a certain iron and steel company includes 10 varieties including FM1, FM2, JM1, JM2, JM3, SJ1, SJ2, QM1, QM2 and SM.
A method for controlling particle size of crushed coal by double-line coal blending, wherein each coal blending line is provided with a coal blending groove, a conveying belt and a crusher, and comprises the following steps:
1) classifying single coking coals, and performing screening and caking property tests on the single coking coals, wherein the single coking coals with the fluidity MF of less than or equal to 100ddpm or the single coking coals with the grain diameter of less than or equal to 3mm accounting for less than or equal to 60 percent of the total mass are A-type coals and comprise SJ1, SJ2, QM1, QM2 and SM, the single coking coals with the fluidity MF of more than 100ddpm and the grain diameter of less than or equal to 3mm accounting for more than 60 percent of the total mass are B-type coals and comprise JM1, JM2, JM3, FM1 and FM 2;
2) coal blending is carried out on single coking coal, SJ1, SJ2, QM1, QM2 and SM serving as A-class coal types are conveyed to a coal blending line A, and coal blending is carried out through different coal blending tanks according to the mass ratio of coking coal blending to obtain blended coal A; conveying JM1, JM2, JM3, FM1 and FM2 serving as B-type coal types to a coal blending line B, and blending coal through different coal blending tanks according to the mass ratio of coking and blending coal to obtain blended coal B; the coking and coal blending mass ratio is as follows: QM 17%, QM 28%, SM 7%, SJ 19%, SJ 27%, JM 112%, JM 213%, JM 314%, FM 112%, FM 211%; the blending coal volatile component is 25.7 percent, and the blending coal caking index is 82;
3) crushing the blended coal, conveying the blended coal A to a crusher A for crushing, adjusting the number and the rotating speed of hammers of the crusher A to obtain the crushed blended coal A, and controlling the coking coal with the particle size of less than or equal to 3mm to account for 78.6 percent of the total mass of the crushed coking coal; conveying the blended coal B to a crusher B for crushing, adjusting the number and the rotating speed of hammers of the crusher B to obtain crushed blended coal B, and controlling the coking coal with the particle size of less than or equal to 3mm to account for 77.5 percent of the total mass of the crushed blended coal B;
4) mixing the blended coal, fully mixing the coal in the crushed coal blending line A and the crushed coal blending line B to obtain total blended coal, wherein the total blended coal is crushed to obtain coking coal with the particle size of less than or equal to 3mm accounting for 78.0 percent of the total mass of the coking coal, and conveying the coking coal to a coal bunker at the top of a coke oven through a belt to be coked.
The total blended coal is charged into a 7m top coke oven for coking, the coking time is 22h, the coke is obtained, the metallurgical coke is obtained by dry quenching cooling at 190t/h, and the quality of the metallurgical coke is analyzed and shown in Table 2.
TABLE 1 Single coking coal parameters for the inventive examples
TABLE 2 coking coal blending (mass percent) and coke quality parameters in the examples of the present invention
As can be seen from Table 2, in the example 1, compared with the reference scheme, the coking coal with the particle size of less than or equal to 3mm of the total blended coal accounts for 77.7-77.9% of the total mass, and is relatively close to the reference scheme, the coking coal with the particle size of less than or equal to 0.5mm accounts for 23.43mm and 34.98% of the total mass, the particle size of the coking coal in the example 1 is reduced by 11.55%, and the coking coal with the particle size of less than or equal to 0.5mm is not beneficial to the fusion of the coking process; from the viewpoint of fluidity, the fluidity of the blended coal is improved by 78ddpm, and the caking property of the blended coal is improved; in the coke quality, the crushing strength of the embodiment 1 is improved by 1.3 percent compared with that of the reference scheme, the wear resistance is reduced by 0.3 percent, and the total coke quality is improved.
As can be seen from Table 2, in example 2, compared with the reference scheme, the coking coal with the particle size of less than or equal to 3mm of the total blended coal accounts for 77.7-78.0% of the total mass, and is relatively close to the reference scheme, the coking coal with the particle size of less than or equal to 0.5mm accounts for 25.20mm and 34.98% of the total mass, the particle size of example 2 is reduced by 9.78%, and the coking coal with the particle size of less than or equal to 0.5mm is not beneficial to the fusion of the coking process; from the viewpoint of fluidity, the fluidity of the blended coal is improved by 53ddpm, and the caking property of the blended coal is improved; on the coke quality, the crushing strength of the embodiment 2 is improved by 0.9 percent compared with that of the reference scheme, the wear resistance is reduced by 0.2 percent, and the total coke quality is improved.
As shown in examples 1 and 2, by adopting the method, the amount of the over-fine coking coal with the particle size of less than or equal to 0.5mm is reduced, the coke quality is favorably improved, the advantages of double-line coal blending are exerted, and the method has positive significance for researching the coke quality control.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A method for controlling particle size of crushed coal by double-line coal blending is characterized in that each coal blending line is provided with a coal blending groove, a conveying belt and a crusher, and the method comprises the following steps:
1) classifying the single coking coal, and performing screening and caking property tests on the single coking coal, wherein the single coking coal with the fluidity MF of less than or equal to 100ddpm or the single coking coal with the particle size of less than or equal to 3mm accounts for less than or equal to 60 percent of the total mass of the single coking coal is the coal of type A, and the single coking coal with the fluidity MF of more than 100ddpm and the particle size of less than or equal to 3mm accounts for more than 60 percent of the total mass of the single coking coal is the coal of type B;
2) blending coal with single coking coal, blending the A-type coal with a 1# coal blending line, transferring the A-type coal to the 1# coal blending line, and blending the coal through different coal blending slots according to the coking coal blending mass ratio to obtain blended coal A; blending B type coal by using a No. 2 coal blending line, transferring the B type coal to the No. 2 coal blending line, and blending coal by different coal blending tanks according to the coking coal blending mass ratio to obtain blended coal B;
3) crushing the blended coal, namely crushing the blended coal A by using a crusher of a No. 1 coal blending line, and controlling the crushed single coking coal with the particle size of less than or equal to 3mm to account for 78-80% of the total mass of the single coking coal; crushing the blended coal B by using a crusher of a No. 2 coal blending line, and controlling single coking coal with the particle size of less than or equal to 3mm to account for 76-78% of the total mass of the crushed blended coal B;
4) mixing the blended coal, fully mixing the crushed blended coal A and the crushed blended coal B to obtain the total blended coal, and conveying the total blended coal to a coal bunker at the top of a coke oven through a belt to be coked.
2. The method for controlling the particle size of crushed coal by two-line coal blending according to claim 1, wherein the mass ratio of the coking coal blending in the step 2) is as follows: 35-40% of coking coal, 20-25% of fat coal, 12-17% of gas coal, 5-8% of lean coal, 17-23% of 1/3 coking coal, 25-26% of coal blending volatile component Vd and 78-82% of coal blending caking index.
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| CN114672332A (en) * | 2022-04-02 | 2022-06-28 | 鞍钢股份有限公司 | Coking and coal blending method for improving coke quality |
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Application publication date: 20211112 |