CN116676095A - Method for producing metallurgical coke by using large-proportion gas coal - Google Patents
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- 239000003245 coal Substances 0.000 title claims abstract description 263
- 239000000571 coke Substances 0.000 title claims abstract description 94
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000004939 coking Methods 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 claims abstract description 31
- 229910052717 sulfur Inorganic materials 0.000 claims description 34
- 239000011593 sulfur Substances 0.000 claims description 34
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 26
- 230000003197 catalytic effect Effects 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 239000002802 bituminous coal Substances 0.000 claims description 2
- 239000003337 fertilizer Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000009257 reactivity Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
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- 238000005516 engineering process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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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 relates to a method for producing metallurgical coke by using gas coal in large proportion, which comprises the following steps: s1) preparing single coking coal to be mixed with a specific content, and S2) preparing coal and tamping coking. According to the invention, gas coal with different qualities is matched, the caking property and the fluidity of the matched coal are kept to meet the requirements by using gas fat coal to replace fat coal, 1/3 coking coal is used to replace coking coal to ensure that the coking property and the strength of the matched coal meet the requirements, under the action of a tamping process, the coking time is properly prolonged, the standard temperature is increased, the large-scale matching of the gas coal is realized, the average level is increased by 30% -40% compared with the average level in the industry, and the gas coal resource is fully utilized; meanwhile, the application of coking coal and fat coal can be greatly reduced or even avoided, and the consumption of the shortage coal is reduced.
Description
Technical Field
The invention belongs to the field of coking coal blending in coking industry, and particularly relates to a method for producing metallurgical coke by using gas coal in large proportion.
Background
Although the coal resources of China are rich, the high-quality coking coal resources such as coking coal, fat coal and the like are deficient, and the resources such as weak caking coal, gas coal, one third of coking coal and the like are relatively rich. On one hand, the coke productivity in China is huge, the resource consumption of coking coal is too fast, and on the other hand, the large-scale requirement on the quality of the coking coal in a blast furnace is higher and higher, so that the proportions of coking coal, fat coal and the like in a coal blending structure are continuously improved for improving the coke strength. Excessive consumption of high-quality coking coal resources greatly increases the cost of coke raw materials, reduces profits and reduces competitiveness. In order to reduce and alleviate the consumption of coking coal and fat coal, adapt to the requirement of long-term development, simultaneously reduce the cost of raw materials of coke, improve the profit of the coke, and must expand the utilization rate of resources such as weak caking coal, gas coal, one third of coking coal and the like relative to rich coal. Particularly, the gas coal is used as the most abundant coking coal in China, is distributed in various provinces of Shandong, shanxi, jiangsu and inner Mongolia, has low price, low ash and sulfur index and can effectively relieve the consumption of high-quality coking coal and reduce the coke cost by increasing the use amount of the gas coal.
Patent CN 113088310B describes a tamping coal blending coking method, its product and coking coal blend, the coking coal does not contain coking coal and fat coal, and the types and weight percentages of the coking coals are: 5-15% of gas coal, 30-40% of 1/3 coking coal, 5-10% of gas fat coal, 10-15% of high-sulfur lean coal and 20-30% of lean coal, so that a good effect is obtained; patent CN 111621314B discloses a tamping coal blending coking method, which is characterized in that no fat coal is blended, and each single coking coal comprises the following components in percentage by weight: 5-10% of weak caking coal, 0-15% of gas coal, 20-30% of 1/3 coking coal, 8-10% of gas fat coal, 25-35% of coking coal, 10-15% of lean coal and 5-10% of lean coal. Although the proportion of coking coal or fat coal is greatly reduced by the technology, the technology cannot apply gas coal in a large proportion, gas coal resources are not fully utilized, and the cost of reducing coke is limited.
Disclosure of Invention
Therefore, the invention aims at solving the problems in the prior art, realizing the large-scale application of gas coal on the premise of ensuring the better quality of coke, reducing the cost of the coke and saving the resources of high-quality short-cut coking coal.
To achieve the above object, according to one embodiment of the present invention, there is provided a method for producing metallurgical coke by mixing gas coal in a large proportion, comprising:
s1) preparing single coking coal to be mixed: the single coking coal comprises the following components in percentage by weight: 60-70% of gas coal, 0-10% of 1/3 coking coal, 5-15% of high-sulfur gas fat coal and 15-22% of lean coal.
Wherein the gas coal, 1/3 coking coal, gas fat coal and lean coal are defined according to the classification standard of bituminous coal in GB/T5751-2009 "China coal Classification", and
s2) coal preparation and tamping coking: the gas coal is singly pre-crushed, and the proportion of less than 3mm after pre-crushing reaches 80% -85%; blending and crushing the single coking coal to be blended in the step S1) according to the content of the single coking coal, wherein the crushed coking coal is 86-88% in the proportion of less than 3mm and is less than 45% in the proportion of less than 0.5 mm; tamping, wherein the density of the tamping bulk is controlled to be 1.0-1.1 t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Then producing the coke on a tamping coke oven, coking for 26-28 hours, wherein the standard of the coke oven is 1340-1350 ℃, and adopting dry quenching to obtain metallurgical coke.
According to one embodiment of the invention, wherein,
the gas coal is further divided into an equal gas coal and an equal gas coal;
the equivalent gas coal requires volatile component V daf >37% -40% and maximum fluidity alpha max More than or equal to 500ddpm, and the CSR of the single coking coke of the small 40kg coke oven is more than or equal to 35 percent, and the catalytic index MCI of ash components is less than or equal to 4 percent,
the second grade gas coal is other gas coal which does not meet the index requirements, and
the content of the equal gas coal is 30% -40%, and the content of the equal gas coal is 25% -30%.
According to one embodiment of the invention, the first-class coal mine is a coal mine in Shanxi Datong region and a coal mine in Shandong mine region.
According to one embodiment of the invention, wherein,
the 1/3 coking coal requires volatile component V daf >28% -35% and maximum fluidity alpha max Not less than 1500ddpm, and the CSR of the single coking coke of the small 40kg coke oven is not less than 45%, and the ash component catalytic index MCI is not more than 4%.
According to one embodiment of the invention, wherein,
the 1/3 coking coal mine is a coal mine in the Hebei Cheng coal mine and Shandong Zaozhuang area.
According to one embodiment of the invention, wherein,
the high sulfur gas fertilizer requires volatile component V daf >37% -42% and maximum fluidity alpha max More than or equal to 10000ddpm, and S is sulfur t，d >2.5 to 4.0 percent, and the CSR of the single coking coke of the small coke oven of 40kg is more than or equal to 40 percent, and the catalytic index MCI of ash components is less than or equal to 4 percent.
According to one embodiment of the invention, wherein,
the lean coal requires volatile component V daf <20, and a bonding index G value>10～20。
According to one embodiment of the invention, wherein,
the quality index of the blended coal obtained after the blending of the various single coking coals meets the following requirements: volatile component V daf 31 to 33 percent of sulfur S t，d Less than or equal to 0.85 percent, ash A d Less than or equal to 10 percent, and the maximum fluidity alpha max More than or equal to 200ddpm, and the ash component catalytic index MCI is less than or equal to 4 percent.
According to one embodiment of the invention, wherein,
the prepared metallurgical coke achieves the following quality indexes: sulfur content is less than or equal to 0.70%, ash content is less than or equal to 13%, and crushing strength M 25 Not less than 90% and wear resistance M 10 Less than or equal to 7 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 60 percent.
Advantageous effects
According to the invention, gas coal with different qualities is matched, the caking property and the fluidity of the matched coal are kept to meet the requirements by using gas fat coal to replace fat coal, 1/3 coking coal is used to replace coking coal to ensure that the coking property and the strength of the matched coal meet the requirements, under the action of a tamping process, the coking time is properly prolonged, the standard temperature is increased, the large-scale matching of the gas coal is realized, the average level is increased by 30% -40% compared with the average level in the industry, and the gas coal resource is fully utilized; meanwhile, the application of coking coal and fat coal can be greatly reduced or even avoided, and the consumption of the shortage coal is reduced.
The gas coal is cheaper than 1/3 coking coal by 200-300 yuan/ton, and is more coking coal and fat coalThe cost of the coke raw material can be greatly reduced after the gas coal of 30 to 40 percent is added at the cost of 500 to 700 yuan/ton. The metallurgical coke prepared by the invention can meet 1500m 3 And (3) using the furnace in an upper blast furnace.
Drawings
Figure 1 is a graph comparing CSR of coke under tamping and non-tamping with three coals of gas coal, coking coal and lean coal,
FIG. 2 shows a coke M with and without tamping of gas coal, coking coal, and lean coal 25 Comparison graph.
Detailed Description
The present invention will be described by the following examples, which are for illustrative purposes only and are not intended to limit the scope of the present invention.
Process examples
In order to fully research the application limit of the gas coal in tamping coke, three-coal coordination experiments of the gas coal, the coking coal and the lean coal are developed. The gas coal is selected from the gas coal in Shanxi Datong region, the coking coal is selected from the peak-to-peak coking coal, the lean coal is selected from Shanxi Changzhi region, the index is shown in table 1, the experiment of 40kg small coke oven is shown in table 2, the coke quality after the experiment coking is shown in table 3, wherein M is 25 Is the coke crushing strength, and the larger the index is, the better M 10 Is the abrasion resistance of the coke, and the smaller the index is, the better the index is.
40kg of small coke oven experiment is carried out by referring to YBT 4526-2016, coking test small coke oven technical Specification, wherein the coking time is 20 hours, and the proportion of the blended coal is 86-88% less than 3 mm; the bulk density of the tamping process is controlled to be 1.0-1.1 t/m 3 The bulk density of the non-tamping process is controlled to be 0.75-0.78 t/m 3 。
Table 1 quality index of three kinds of coals
Table 2 experimental protocol
| Scheme for the production of a semiconductor device | Gas coal A | Coking coal B | Lean coal C | Process for producing a solid-state image sensor |
| Scheme 1 | 40％ | 40％ | 20％ | Tamping machine |
| Scheme 2 | 50％ | 30％ | 20％ | Tamping machine |
| Scheme 3 | 60％ | 20％ | 20％ | Tamping machine |
| Scheme 4 | 70％ | 10％ | 20％ | Tamping machine |
| Scheme 5 | 40％ | 40％ | 20％ | Not tamping |
| Scheme 6 | 50％ | 30％ | 20％ | Not tamping |
| Scheme 7 | 60％ | 20％ | 20％ | Not tamping |
| Scheme 8 | 70％ | 10％ | 20％ | Not tamping |
TABLE 3 experimental results
| Scheme for the production of a semiconductor device | A d /％ | S t，d /％ | M 25 /％ | M 10 /％ | CRI/％ | CSR/％ |
| Scheme 1 | 10.3 | 0.51 | 94.6 | 6.2 | 25.8 | 67.6 |
| Scheme 2 | 10.1 | 0.52 | 92.5 | 7.5 | 29.7 | 64.2 |
| Scheme 3 | 9.98 | 0.51 | 91.8 | 8.7 | 31.5 | 62.8 |
| Scheme 4 | 9.80 | 0.53 | 90.5 | 9.3 | 32.3 | 60.6 |
| Scheme 5 | 10.2 | 0.51 | 91.4 | 8.3 | 29.2 | 63.0 |
| Scheme 6 | 10.1 | 0.53 | 89.6 | 10.1 | 31.6 | 60.9 |
| Scheme 7 | 9.95 | 0.52 | 85.2 | 11.4 | 34.1 | 57.9 |
| Scheme 8 | 9.88 | 0.52 | 84.6 | 13.2 | 35.2 | 55.3 |
As can be seen from tables 2 and 3, under the same process (tamping and not tamping) conditions, as the proportion of gas-coal increases, the proportion of coking coal decreases, and the cold strength (M) of the coke 25 And M 10 ) And thermal state strength (CRI and CSR) are deteriorated to some extent. As can be seen from fig. 1 and 2, the coke cold strength (M) of schemes 3 and 4 was increased to 60% and 70% gas-to-coal ratio under the tamping process 25 And M 10 ) And the thermal state strength (CRI and CSR) are still equivalent to those of schemes 5 and 6 without tamping, the CSR can reach more than 60 percent, M 25 The gas-coal effect is obvious when the ratio reaches more than 90%, which can enlarge the ratio. In principle, the analysis is that after the bulk density is increased by using the tamping coke process, the resistance encountered when gas generated by gas coal pyrolysis escapes is increased, the residence time in colloid is delayed, and the atomic groups with free radicals or the thermal decomposition intermediate products in the gas have more sufficient time interaction, so that the defect of high volatile components of the gas coal is overcome. Therefore, although the coke strength is deteriorated to some extent with the increase of the gas-coal ratio, the strength after the "deterioration to some extent" still can meet the requirement of metallurgical coke under the tamping process.
Thus, the use of a tamping process was determined. The invention will be described in further detail with reference to specific examples of use of the tamping process.
Example 1:
the individual coals and the index are shown in Table 4.
TABLE 4 classification and index of coal types
The individual coals of table 4 were selected in the following weight percentages: 30% of a first gas coal, 30% of a second gas coal, 1/3 of coking coal 1#10%, 1#10% of high sulfur gas fat coal, and 2#20% of lean coal;
then, pre-crushing the gas coal, wherein the proportion of the pre-crushed gas coal smaller than 3mm reaches 84%; crushing the mixed coal, wherein the crushed coal is 88.5% less than 3mm and the crushed coal is less than 44% less than 0.5 mm; the quality index of the blended coal obtained after blending is as follows: volatile component V daf 32.6%, sulfur content 0.81%, ash content 9.8%, bond index G value 64, maximum fluidity alpha max At 290ddpm, the ash component catalytic index MCI was 3.2％；
Tamping, controlling the tamping bulk density at 1.04t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 26 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.68%, ash content of 12.95%, crushing strength M 25 92.8% of wear resistance M 10 6.9%, 27.4% of reactive CRI and 63.8% of strength CSR after reaction, and meets the metallurgical coke index requirements.
Example 2:
the individual coals of table 4 were blended in the following weight percentages: 40% of first-class gas coal, 30% of second-class gas coal, 1#10% of high-sulfur gas fat coal, 1#4% of low-weight coal and 2#16% of low-weight coal;
then, pre-crushing the gas coal, wherein the proportion of the pre-crushed gas coal smaller than 3mm reaches 82%; crushing the mixed coal, wherein the crushed coal is 88% less than 3mm and the crushed coal is less than 46% less than 0.5 mm; the quality index of the blended coal obtained after blending is as follows: volatile component V daf At 32.8%, sulfur content 0.85%, ash content 9.75%, bond index G value 62, maximum fluidity alpha max 225ddpm, ash composition catalytic index MCI of 3.8%;
tamping, controlling the tamping bulk density at 1.03t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 26 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.70%, ash content of 12.92%, crushing strength M 25 91% of wear resistance M 10 6.6%, 27.8% of reactive CRI and 62.1% of strength CSR after reaction, and meets the metallurgical coke index requirements.
Example 3:
the individual coals of table 4 were blended in the following weight percentages: 35% of first-class gas coal, 30% of second-class gas coal, 1#11% of high-sulfur gas fat coal and 24% of low-weight coal;
then, pre-crushing the gas coal, wherein the proportion of less than 3mm after pre-crushing reaches 85%; crushing the mixed coal, wherein the crushed coal is 88.6% smaller than 3mm and the crushed coal is smaller than 46% smaller than 0.5 mm; matching withThe quality index of the blended coal obtained after the combination is as follows: volatile component V daf At 32.2%, sulfur content 0.84%, ash content 9.83%, bond index G value 61, maximum fluidity alpha max An ash component catalytic index MCI of 3.6% at 215 ddpm;
tamping, controlling the tamping bulk density at 1.04t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 26 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content was 0.69%, ash content was 12.98%, crushing strength M 25 90.8% of wear resistance M 10 6.8 percent, 28.7 percent of reactive CRI and 61.9 percent of strength CSR after reaction, thereby meeting the metallurgical coke index requirement.
Example 4:
the individual coals of table 4 were blended in the following weight percentages: 35% of first-class gas coal, 25% of second-class gas coal, 1#8% of 1/3 coking coal, 1#10% of high-sulfur gas fat coal, 1#5% of lean coal and 2#17% of lean coal;
then, pre-crushing the gas coal, wherein the proportion of less than 3mm after pre-crushing reaches 85%; crushing the mixed coal, wherein the crushed coal is 88% of the crushed coal with the proportion of less than 3mm and the crushed coal with the proportion of less than 0.5mm is less than 45%; the quality index of the blended coal obtained after blending is as follows: volatile component V daf At 32.5%, sulfur content 0.84%, ash content 9.80%, bond index G value 63, maximum fluidity alpha max 255ddpm, an ash composition catalytic index MCI of 3.4%;
tamping, controlling the tamping bulk density at 1.04t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 26 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.70%, ash content of 12.93%, crushing strength M 25 91.3% of wear resistance M 10 6.5%, 27.7% of reactive CRI and 62.9% of strength CSR after reaction, and meets the metallurgical coke index requirements.
Comparative example 1:
the individual coals of table 4 were blended in the following weight percentages: 40% of first-class gas coal, 35% of second-class gas coal, 1#5% of 1/3 coking coal, 1#5% of high-sulfur gas fat coal and 1#15% of low-weight coal;
then, pre-crushing the gas coal, wherein the proportion of the pre-crushed gas coal smaller than 3mm reaches 83%; crushing the mixed coal, wherein the crushed coal is 88.2% smaller than 3mm and the crushed coal is smaller than 46% smaller than 0.5 mm; the quality index of the blended coal obtained after blending is as follows: volatile component V daf At 34.8%, sulfur content 0.81%, ash content 9.85%, bond index G value 66, maximum fluidity alpha max 260ddpm, ash composition catalytic index MCI 3.3%;
tamping, controlling the tamping bulk density at 1.02t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 26 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.67%, ash content of 12.95%, crushing strength M 25 89.2% of wear resistance M 10 7.3%, the reactive CRI is 31.2%, the strength CSR after reaction is 58.1%, and the metallurgical coke index requirement is not met.
The difference of the comparative example 1 is that the proportions of the single coals are different, the total proportion of the gas and the coal of the comparative example 1 exceeds 70 percent and exceeds the limit of the proportion of the gas and the coal, so that the integral coal blending structure is disordered, the volatile component of the blended coal is increased to more than 34 percent, the coking property is reduced, the coke pores are increased, the strength is reduced more, and the metallurgical coke index requirement is not met.
Comparative example 2:
the individual coals of table 4 were blended in the following weight percentages: 35% of first-class gas coal, 30% of second-class gas coal, 14% of high-sulfur gas fat coal, and 21% of low-weight coal;
then, pre-crushing the gas coal, wherein the proportion of less than 3mm after pre-crushing reaches 85%; crushing the mixed coal, wherein the crushed coal is 88.6% smaller than 3mm and the crushed coal is smaller than 46% smaller than 0.5 mm; the quality index of the blended coal obtained after blending is as follows: volatile component V daf At 32.6%, sulfur content 0.82%, ash content 9.69%, bond index G value 63, maximum fluidity alpha max 125ddpm, an ash composition catalytic index MCI of 4.7%;
tamping, controlling the tamping bulk density at 1.04t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Production on stamp-charging coke oven, coking time 2For 6 hours, the standard of the coke oven is 1340 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.66%, ash content of 12.8%, crushing strength M 25 91.0%, wear resistance M 10 6.2%, the reactive CRI is 31.5%, the strength CSR after reaction is 57.3%, and the metallurgical coke index requirement is not met.
Comparative example 2 differs from example 3 in that comparative example 2 uses high sulfur gas fatlute coal #2, its maximum fluidity is 12560ddpm, it is lower, the ash component catalytic index is 3.99%, it is higher, resulting in that the fluidity of the blended coal and the ash component catalytic index do not meet the index requirements of the blended coal, resulting in a larger decrease in the thermal state strength CSR of the coke, and does not meet the index requirements of metallurgical coke.
Comparative example 3:
the individual coals of table 4 were blended in the following weight percentages: 35% of first-class gas coal, 25% of second-class gas coal, 1#8% of 1/3 coking coal, 1#10% of high-sulfur gas fat coal, 1#5% of lean coal and 2#17% of lean coal;
then, pre-crushing the gas coal, wherein the proportion of less than 3mm after pre-crushing reaches 85%; crushing the mixed coal, wherein the crushed coal is less than 85% of 3mm and less than 43% of 0.5 mm; the quality index of the blended coal obtained after blending is as follows: volatile component V daf At 32.5%, sulfur content 0.84%, ash content 9.80%, bond index G value 63, maximum fluidity alpha max 255ddpm, an ash composition catalytic index MCI of 3.4%;
tamping, controlling the tamping bulk density at 1.04t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The coke is produced on a tamping coke oven, the coking time is 25 hours, the standard of the coke oven is 1350 ℃, and dry quenching is adopted.
The obtained metallurgical coke achieves the following quality indexes: sulfur content of 0.70%, ash content of 12.93%, crushing strength M 25 89.9% of wear resistance M 10 7.8%, the reactive CRI is 33.2%, the strength CSR after reaction is 58.0%, and the metallurgical coke index requirement is not met.
The difference between the comparative example 3 and the example 4 is that the ratio of the crushed coal of the comparative example 3 to the crushed coal is 85 percent which is lower, the coking time is 25 hours and lower, and the production process index does not meet the requirements. The lower proportion of less than 3mm indicates that the large-particle gas coal is insufficiently crushed, coke cracks can be generated, and the cold strength is influenced; the lower coking time leads to insufficient coke maturation, so that CRI is increased, CSR is reduced, and the metallurgical coke index requirement is not met.
Claims (9)
1. A method for producing metallurgical coke by using gas coal in large proportion, comprising the following steps:
s1) preparing single coking coal to be mixed: the single coking coal comprises the following components in percentage by weight: 60 to 70 percent of gas coal, 0 to 10 percent of 1/3 coking coal, 5 to 15 percent of high sulfur gas fat coal, 15 to 22 percent of lean coal,
wherein the gas coal, 1/3 coking coal, gas fat coal and lean coal are defined according to the classification standard of bituminous coal in GB/T5751-2009 "China coal Classification", and
s2) coal preparation and tamping coking: the gas coal is singly pre-crushed, and the proportion of less than 3mm after pre-crushing reaches 80% -85%; blending and crushing the single coking coal to be blended in the step S1) according to the content of the single coking coal, wherein the crushed coking coal is 86-88% in the proportion of less than 3mm and is less than 45% in the proportion of less than 0.5 mm; tamping, wherein the density of the tamping bulk is controlled to be 1.0-1.1 t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Then producing the coke on a tamping coke oven, coking for 26-28 hours, wherein the standard of the coke oven is 1340-1350 ℃, and adopting dry quenching to obtain metallurgical coke.
2. The method of claim 1, wherein,
the gas coal is further divided into an equal gas coal and an equal gas coal;
the equivalent gas coal requires volatile component V daf >37% -40% and maximum fluidity alpha max More than or equal to 500ddpm, and the CSR of the single coking coke of the small 40kg coke oven is more than or equal to 35 percent, and the catalytic index MCI of ash components is less than or equal to 4 percent,
the second grade gas coal is other gas coal which does not meet the index requirements, and
the content of the equal gas coal is 30% -40%, and the content of the equal gas coal is 25% -30%.
3. The method of claim 1, wherein,
the first-class gas coal mine is a coal mine in Shanxi Datong region and a coal mine in Shandong mine region.
4. The method of claim 1, wherein,
the 1/3 coking coal requires volatile component V daf >28% -35% and maximum fluidity alpha max Not less than 1500ddpm, and the CSR of the single coking coke of the small 40kg coke oven is not less than 45%, and the ash component catalytic index MCI is not more than 4%.
5. The method of claim 1, wherein,
the 1/3 coking coal mine is a coal mine in the Hebei Cheng coal mine and Shandong Zaozhuang area.
6. The method of claim 1, wherein,
the high sulfur gas fertilizer requires volatile component V daf >37% -42% and maximum fluidity alpha max More than or equal to 10000ddpm, and S is sulfur t，d >2.5 to 4.0 percent, and the CSR of the single coking coke of the small coke oven of 40kg is more than or equal to 40 percent, and the catalytic index MCI of ash components is less than or equal to 4 percent.
7. The method of claim 1, wherein,
the lean coal requires volatile component V daf <20, and a bonding index G value>10～20。
8. The method of claim 1, wherein,
the quality index of the blended coal obtained after the blending of the various single coking coals meets the following requirements: volatile component V daf 31 to 33 percent of sulfur S t，d Less than or equal to 0.85 percent, ash A d Less than or equal to 10 percent, and the maximum fluidity alpha max More than or equal to 200ddpm, and the ash component catalytic index MCI is less than or equal to 4 percent.
9. The method of claim 1, wherein,
the prepared metallurgical coke achieves the following quality indexes: sulfur content is less than or equal to 0.70%, ash content is less than or equal to 13%, and crushing strength M 25 Not less than 90% and wear resistance M 10 Less than or equal to 7 percent, the reactivity CRI less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 60 percent.
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