CN116622397A - Coal blend, coal blending method and prepared coke - Google Patents
Coal blend, coal blending method and prepared coke Download PDFInfo
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- CN116622397A CN116622397A CN202310478239.9A CN202310478239A CN116622397A CN 116622397 A CN116622397 A CN 116622397A CN 202310478239 A CN202310478239 A CN 202310478239A CN 116622397 A CN116622397 A CN 116622397A
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- 239000003245 coal Substances 0.000 title claims abstract description 263
- 239000000571 coke Substances 0.000 title claims abstract description 50
- 238000002156 mixing Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000203 mixture Substances 0.000 title description 4
- 238000004939 coking Methods 0.000 claims abstract description 92
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 85
- 239000011593 sulfur Substances 0.000 claims abstract description 85
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000002474 experimental method Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 11
- 238000009776 industrial production Methods 0.000 claims description 8
- 239000004079 vitrinite Substances 0.000 claims description 7
- 239000003337 fertilizer Substances 0.000 claims description 5
- 238000012795 verification Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 238000002310 reflectometry Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a coal blending method and a prepared coke, belonging to the technical field of metallurgical coke production. The mixed coal comprises 14% -15% of 1/3 coking coal, 24% -28% of fat coal, 39% -47% of main coking coal and 14% of lean coal, the mixing proportion of medium-high sulfur coal and high sulfur coal in the mixed coal is 39% -43%, the medium-high sulfur coal comprises fat coal three, main coking coal three and main coking coal four, and the high sulfur coal is main coking coal five. The invention improves the blending ratio of the medium-high sulfur coal and the high sulfur coal through the synergistic effect between coal types, the quality of the coking carbon is qualified, and the sulfur can be controlled within the range of 0.71-0.82 percent.
Description
Technical Field
The invention belongs to the technical field of metallurgical coke production, and particularly relates to a blended coal, a coal blending method and prepared coke.
Background
At present, main coal types of the horse steel include gas coal, 1/3 coking coal, fat coal, gas fat coal, coking coal and lean coal, and mineral sources are mainly distributed in areas such as Huainan, huabei, shandong, shanxi and the like. In order to reduce the production cost and expand the resources of coking coal, a plurality of coking enterprises in the industry increase the usage amount of medium-high sulfur coking coal. The problem of exceeding sulfur content in coke can occur when the blending proportion of medium-high sulfur coal is increased, so that the quality of pig iron can be reduced and the alkalinity of slag can be increased when the blast furnace is smelted. Therefore, on the premise of stabilizing coke quality, the blending proportion of the medium-high sulfur coking coal is further improved, and the realization of cost reduction and synergy and the expansion of coking coal resources are important problems commonly faced in the coking industry.
Through searching, patent CN111019682A discloses a blended coal for tamping coke and a production process thereof, wherein the blended coal for tamping coke comprises the following components in percentage by weight: 5-15% of low-sulfur coking coal, 3-10% of low-sulfur coking coal, 20-30% of high-sulfur coking coal, 5-12% of low-sulfur fat coal, 5-10% of high-sulfur fat coal, 0-5% of extra-high-sulfur fat coal, 5-15% of low-sulfur 1/3 coking coal, 5-15% of low-sulfur gas coal, 5-12% of low-sulfur lean coal and 0-10% of extra-high-sulfur lean coal.
Patent CN105713633A discloses a coking coal blending method involving medium-high sulfur fat coal, wherein the coking coal comprises the following components in percentage by weight: 1/3 coking coal: 8% -18%; medium and high sulfur fat coal: 10% -20%; fertilizer coal: 8% -29%; coking coal with caking index G more than or equal to 78: 16% -35%; coking coal with caking index of 75-78G: 19% -36%; lean coal: 8% -22%. In the application of the invention, other coal types with low sulfur content are selectively mixed when the sulfur fertilizer is used, meanwhile, the coal rock mixing method is utilized, the coal mixing and the selection of the coal types are continuously optimized by combining the existing coal resources, and the coal types matched with the coal types are selected for coal mixing, so that the vitrinite reflectance distribution of the mixed coal is continuous.
In the scheme, the addition amount of the medium-high sulfur coal and the high sulfur coal is less, and the sulfur content and the quality of the coke can not be ensured while the addition amount of the coal with high sulfur content can not be ensured.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the sulfur content and the quality of coke cannot be ensured while improving the addition of coal with high sulfur content, the invention provides a blended coal, a coal blending method and a prepared coking coal.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
according to the coal blending method, a plurality of coal blending schemes are designed by taking weight as a unit, the blending amount of four coal types of 1/3 coke, fertilizer, coke and lean coal is optimized, and a plurality of groups of small coke oven experiments are carried out; comparing the coke quality after the small coke oven test with sulfur content data in the coke, and optimizing the optimal coal type and coal blending scheme; and carrying out industrial test verification on the determined laboratory optimized coal blending scheme, thereby obtaining the optimal industrial production coal blending scheme.
The obtained blended coal comprises, by mass, 14% -15% of 1/3 coking coal, 24% -28% of fat coal, 39% -47% of main coking coal and 14% of lean coal.
The 1/3 coking coal comprises 7-10% of 1/3 coking coal I and 5-7% of 1/3 coking coal II; the fat coal comprises 5% -9% of fat coal I, 10% -11% of fat coal II and 6% -8% of fat coal III; the main coking coal comprises 8% -10% of first main coking coal, 4% of second main coking coal, 16% -18% of third main coking coal, 14% of fourth main coking coal and 3% of fifth main coking coal; the lean coal comprises 6% of first lean coal and 8% of second lean coal.
The blending ratio of the medium-high sulfur coal and the high sulfur coal in the blended coal is 39% -43%, and the blending ratio of the medium-high sulfur coal and the high sulfur coal is 44: and 3, the medium-high sulfur coal comprises one or more of fat coal three, main coking coal three and main coking coal four, and the high sulfur coal is main coking coal five.
The performance parameters of the individual coals are shown in table 1. Table 1 shows the performance parameters of various coals of the invention, wherein Mt is total moisture, ad is dry base ash, vdaf is dry ash-free base volatile, st, d is dry base total sulfur, G is bond index, and Y is gum layer thickness.
TABLE 1 Performance parameters of various coals of the invention
The invention defines the coal with the sulfur content less than 0.3 percent as ultra-low sulfur coal, the coal with the sulfur content of 0.31 percent to 0.75 percent as low sulfur coal, the coal with the sulfur content of 0.76 percent to 1.25 percent as medium sulfur coal, the coal with the sulfur content of 1.26 percent to 1.75 percent as medium sulfur coal and the coal with the sulfur content of 1.76 percent to 2.5 percent as high sulfur coal.
By controlling Std of the blended coal to be 0.9486% -0.9886%, V daf 24.14 to 26.72 percent and a bonding index G of 85.1 to 85.25, wherein Std of the 1/3 coking coal is 0.44 to 0.45 percent and V daf 33.31% -33.86% and the bonding index G is 88-89; the Std of the fat coal is 0.84-0.94%, V daf 34.32 to 33.68 percent, and the bonding index G is 91.46 to 91.4; std of main coking coal is 1.25% -1.30%, V daf 23.22 to 23.24 percent, and the bonding index G is 86.44 to 86.49; std of lean coal is 0.62%, V daf 17.74% and a bond index G of 66.43. Wherein Std of the medium-high sulfur coal in the components is 1.40% -1.42%, vdaf is 23.38% -23.80%, and bonding index G is 87.17-81.82.
The volatile content and the sulfur content of the blended coal have decisive influence on the sulfur content in the coke, so the invention controls the Std of the blended coal to be 0.9486-0.9886 percent and V in the experimental process daf 24.14 to 26.72 percent and the bonding index G is 85.1 to 85.25. Selecting fat coal three, main coking coal three and main coking coal four as added medium-high sulfur coal, main coking coal five as high sulfur coal, and screening coal types with high desulfurization rate on coking coal through an addition experimentFurther, in order to ensure the quality of the coke, the quality of the coke is improved on the premise of reducing the sulfur content, so that the viscosity G of coal types in the blended coal is controlled to be 85.01-85.2, and the obtained coke can realize the reduction of the sulfur content of the coke and the improvement of the quality of the coke under the condition that the blending ratio of medium-high sulfur coal and high sulfur coal is 39-43 percent.
In addition, the invention improves the thermal state quality of coke by controlling the blending of 1/3 coking coal I and 1/3 coking coal II with the average maximum reflectivity of 0.910-1.123% of the vitrinite and the fat coal I with the average maximum reflectivity of 0.921-1.259% of the vitrinite.
The invention discloses a coal blending method for blended coal, which specifically comprises the following steps:
step S1, a first experiment: taking main coking coal as a reference, researching the sulfur removal condition of the coking coal matched with coal types;
step S2, a second experiment: taking the blended coal as a reference, researching the influence of coal species blending on the sulfur removal condition of coke and the coke quality;
and S3, industrial production test verification.
The experimental process is that firstly, small coke oven experiments are adopted for screening, and after coal seeds are determined to be matched, the industrial production experiments are utilized for verification.
Coke prepared by using the blended coal with improved medium-high sulfur coal blending ratio, S of the coke td 0.71-0.82%, the crushing strength M40 is more than 89.1%, and the wear resistance M10 is 5.5-5.9%.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
the invention can make the blending proportion of the medium-high sulfur coal and the high sulfur coal reach 39-43% by controlling the blending of coal types, the quality of the coking coal is qualified, and the sulfur can be controlled within the range of 0.71-0.82%.
Detailed Description
The following illustrates, by way of example, exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
The invention firstly carries out small coke oven experiments. Coking experiment equipment and technical parameter selection: the experimental coke oven selects 100g crucible coke; 200g (dry basis) of coal is charged once, the fineness of the blended coal is 71-75% in proportion of less than 3mm, the water content of the blended coal is 10%, the temperature is raised to 1050 ℃ at 0.5 ℃/min, the temperature is kept for 2 hours, and then the temperature is lowered to room temperature and the coke is discharged from the furnace to detect the sulfur content in the coke.
First round of experiments, N1-N6: the sulfur removal conditions of the coking coals matched with the single coal types are studied, the most suitable coal types matched with the coal blending scheme are determined, and the analysis of coke sulfur content data is shown in a table 2. Based on the main coking coal five, sulfur in the coke can be reduced after the main coking coal five is mixed with 1/3 coking coal one, fat coal two, 1/3 coking coal three and lean coal one, wherein the effect of the 1/3 coking coal one is optimal.
Table 2 analysis and comparison of the sulfur content data of the first run of the experiment
Second round of experiments, N7-N10: the influence of various coals on the sulfur content and the coke quality in the coke refined by the blended coal was studied, and the coal used for blending was determined, and the analysis of the sulfur content data of the coke was shown in table 3. Wherein, regard benchmark blend coal as the benchmark, among the benchmark blend coal: ad=9.35%, vdaf= 26.70%, st, d=0.81%, and adding 5%1/3 coking coal one and 2% lean coal one or 5% lean coal one to the standard blended coal can reduce sulfur content in coke, and simultaneously CRI is reduced, CSR is improved, so that subsequent industrial experiments consider that the blending amount of 1/3 coking coal one and lean coal one is increased.
Table 3 analysis and comparison of sulfur content data from the second run of experiment coke
The above industrial production test was verified, and the industrial production test data are shown in table 4.
Test coke oven: 7.63 m coke oven, coking time is 26 hours, standard temperature 1290 ℃, coal loading per hole is 66 tons, fineness of matched coal is less than or equal to 3mm, proportion is 71% -73%, and test investigation time is 22 days.
TABLE 4 Industrial production test data
Through 20 days of industrial tests, under the condition that the blending proportion of medium-high sulfur coal is 39% -43%, sulfur in coke can be controlled within the range of 0.71% -0.82%, crushing strength M40 is more than 89.1%, and wear resistance M10 is 5.5% -5.9%.
According to the condition of coal resources at home and abroad, the marquee is found through 33 groups of small coke oven experiments and industrial production experiments, the blending proportion of fat coal three, main coking coal four and main coking coal five in the blended coal can reach 39% -43% by controlling the average maximum reflectivity of the vitrinite to be 0.910% -1.123% of 7-10%1/3 coking coal I, 5-7% of 1/3 coking coal II and the average maximum reflectivity of the vitrinite to be 0.921% -1.259% of 5-9% fat coal I, and the quality of the coking coal is qualified and sulfur can be controlled within the range of 0.71-0.82.
Claims (10)
1. The blended coal is characterized by comprising, by mass, 14% -15% of 1/3 coking coal, 24% -28% of fat coal, 39% -47% of main coking coal and 14% of lean coal, wherein the blending ratio of medium-high sulfur coal and high sulfur coal of the blended coal is 39% -43%.
2. The blended coal according to claim 1, wherein the mass ratio of the medium-high sulfur coal to the high sulfur coal is 44:3.
3. the blended coal according to claim 2, wherein the 1/3 coking coal comprises 7% -10%1/3 coking coal one and 5% -7% 1/3 coking coal two; the fat coal comprises 5% -9% of fat coal I, 10% -11% of fat coal II and 6% -8% of fat coal III; the main coking coal comprises 8% -10% of first main coking coal, 4% of second main coking coal, 16% -18% of third main coking coal, 14% of fourth main coking coal and 3% of fifth main coking coal; the lean coal comprises 6 percent of lean coal I and 8 percent of lean coal II,
st, d of the 1/3 coking coal I are 0.47%, vdaf is 32.23%, and bonding index G is 91.0;
st, d of the 1/3 coking coal II are 0.41%, vdaf is 35.48%, and bonding index G is 85.0;
st, d of the fertilizer coal I is 0.64%, vdaf is 31.86%, and bonding index G is 91.0;
st, d of the second fertilizer coal is 0.54%, vdaf is 36.68%, and bonding index G is 92.0;
st, d and Vdaf of the fat coal III are 1.66%, 33.68% and 91.0 respectively;
st, d of the primary coking coal I is 0.42%, vdaf is 21.67%, and bonding index G is 84.0;
st, d of the main coking coal II are 0.74%, vdaf is 23.54%, and bonding index G is 87.0;
st, d of the main coking coal III are 1.34%, vdaf is 21.89%, and bonding index G is 85.0;
st, d of the main coking coal IV are 1.68%, vdaf is 25.70%, and bonding index G is 90.0;
st, d of the main coking coal five is 2.24%, vdaf is 23.50%, and bonding index G is 85.0;
st, d and Vdaf of the lean coal I are respectively 0.51%, 18.70% and 55.0 respectively;
and St, d and Vdaf of the lean coal II are respectively 0.71%, 17.02% and 75.0, respectively.
4. The blended coal according to claim 3, wherein the medium-high sulfur coal comprises one or more of fat coal three, main coking coal three and main coking coal four, and the high sulfur coal is main coking coal five.
5. The blended coal according to claim 4, wherein the medium and high sulfur coal has Std of 1.40% -1.42%, vdaf of 23.38% -23.80%, and caking index G of 87.17-81.82.
6. The blended coal according to claim 5, wherein the Std of the 1/3 coking coal is 0.44% -0.45%, V daf 33.31% -33.86% and the bonding index G is 88-89; the Std of the fat coal is 0.84-0.94%, V daf 34.32 to 33.68 percent, and the bonding index G is 91.46 to 91.4; std of main coking coal is 1.25% -1.30%, V daf 23.22 to 23.24 percent, and the bonding index G is 86.44 to 86.49; std of lean coal is 0.62%, V daf 17.74% and a bond index G of 66.43.
7. The blended coal according to claim 6, wherein the blended coal has a Std of 0.9486% -0.9886%, V daf 24.14 to 26.72 percent and the bonding index G is 85.1 to 85.25.
8. The blended coal according to claim 7, wherein the 1/3 coking coal one and 1/3 coking coal two have a vitrinite average maximum reflectance of 0.910% to 1.123%, and the fat coal one has a vitrinite average maximum reflectance of 0.921% to 1.259%.
9. A coal blending method for blending coal as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
step S1, a first experiment: taking the main coking coal as a reference, researching the sulfur removal condition of the coking coal matched with the coal types;
step S2, a second experiment: taking the reference blended coal as a reference, researching the influence of coal type blending on the coke sulfur removal condition and the coke quality;
and S3, industrial production test verification.
10. A coke produced by using the blended coal of any one of claims 1-8, wherein the coke has a coking time of 26 hours and a standard temperature of 1290 ℃ after testing S td 0.71-0.82%, the crushing strength M40 is more than 89.1%, and the wear resistance M10 is 5.5-5.9%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310478239.9A CN116622397A (en) | 2023-04-28 | 2023-04-28 | Coal blend, coal blending method and prepared coke |
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| CN202310478239.9A CN116622397A (en) | 2023-04-28 | 2023-04-28 | Coal blend, coal blending method and prepared coke |
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