CN111621313A - Tamping coal blending coking method - Google Patents
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Abstract
The invention provides a tamping coal blending coking method which is characterized in that main coking coal is not blended, the method comprises the step of blending various single coking coals, and the single coking coals and the weight percentages thereof are as follows: 6-9% of weakly caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal and 12-15% of lean reducing coal. The invention realizes the following technical effects by using the gas fat coal and fat coal with better coking property and better caking property to combine with lean coal and poor lean coal for coal blending: the coke quality is ensured, the coke resource consumption is reduced and slowed down, the coal blending cost is reduced, and the coke profit is improved.
Description
Technical Field
The invention belongs to the technical field of coking in the coking industry, and particularly relates to a tamping coal blending coking method.
Background
Most of the existing common coal blending coking adopt coking coal, fat coal, gas coal, lean coal and the like, wherein the coking coal and the fat coal are indispensable as skeleton coal types.
However, the coal resources in China are not rich in coal suitable for coking, particularly the reserves of high-quality coking coal such as coking coal are less, and the regional distribution of the resources is extremely unbalanced; while the weakly caking coal, the gas coal and the 1/3 coking coal have relatively rich resources. The coke quality requirement is higher and higher along with the large-scale blast furnace, and the coke coal equal proportion in the coal blending structure is continuously improved in order to improve the coke strength. In addition, the coke oven is also required to increase the proportion of strongly caking coal in the coal blending in the development of large-sized and wide coking chambers. It is understood that the ratio of coking coal to fat coal in the coal blending structure of the tamping coke ovens of 5.5m and 6.25m still reaches 40 to 50 percent, wherein the ratio of the coking coal is 20 to 30 percent. Therefore, resources such as coking coal and the like in China are less and less, and are in shortage. Therefore, the development and expansion of other weak caking coal are urgently needed, on one hand, the resource consumption of coking coal, fat coal and the like is reduced and slowed down, and the requirement of long-term development is met; on one hand, the coal blending cost is reduced, and the coke profit is improved.
Disclosure of Invention
The invention aims to provide a tamping coal blending coking method, which does not blend coking coal while ensuring the quality of coke, increases the proportion of gas coal, gas fat coal and 1/3 coking coal, and keeps the proportion of low fat coal, thereby reducing the production cost and reasonably utilizing coal resources.
In order to achieve the purpose, the invention provides a tamping coal blending coking method which is characterized in that main coking coal is not blended, the method comprises the step of blending various single coking coals, and the single coking coals and the weight percentages thereof are as follows: 6-9% of weakly caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal, 12-15% of lean reducing coal,
wherein, V of the fat coaldafThe maximum Gieseler fluidity is not less than 30 percent, the maximum Gieseler fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 60 percent, or the CSR of the single coking coke of an iron box experiment is not less than 65 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 90 percent;
v of the gas fat coaldafNot more than 38 percent, the Gieseler maximum fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 50 percent, or the CSR of the single coking coke of an iron box experiment is not less than 55 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 30 percent;
v of the 1/3 coking coaldafLess than or equal to 35 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 40 percent or the CSR of the single coking coke of an iron box experiment is more than or equal to 45 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is more than or equal to 30 percent;
the lean coal G is more than or equal to 50 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 25 percent, or the CSR of the single coking coke of an iron box experiment is more than or equal to 30 percent, and the proportion of 0.8-1.5 percent in the distribution of the random reflectivity Re of the coal-rock phase mirror group is more than or equal to 20 percent; and
the lean coal G is more than or equal to 15.
The fat coal or gas fat coal can adopt fat coal or gas fat coal with sulfur content more than 1.5 percent; preferably, fat coal or gas fat coal having a sulfur content of more than 2% can be used. The inventor researches for a long time to find that the higher the sulfur content is, the stronger the caking property is; and the high-sulfur fat coal and the high-sulfur gas fat coal have low price and low sulfur conversion rate (the residual sulfur content in the coke is low, and most of the sulfur content is converted into the coal gas), so that the coke can be applied in a large proportion on the premise of ensuring the standard of the sulfur content of the coke, and the coal blending price is effectively reduced.
Preferably, the individual coking coals and their weight percentages are as follows: 6-9% of weakly caking coal, 6-9% of gas coal, 20-22% of 1/3 coking coal, 18-21% of gas fat coal, 10-15% of fat coal, 18-20% of lean coal and 12-15% of lean reducing coal.
The quality indexes of the blended coal in the method are as follows: the water content is less than or equal to 12 percent, the ash content is less than or equal to 10 percent, the sulfur content is less than or equal to 0.80 percent, the volatile matter is 26-30 percent, the bonding index G is more than or equal to 68, and the maximum thickness Y of the colloidal layer is more than or equal to 12.5 mm; the proportion of 0.8-1.5% in the distribution of the random reflectance Re of the coal petrography vitrinite is more than or equal to 50%, wherein the proportion of 0.9-1.2% is more than or equal to 25%, and the reflectance distribution curve is continuous without obvious gaps.
In a specific embodiment, before the mixing step, the weakly caking coal and the gas coal are respectively pre-crushed, and the fineness (less than 3mm) after pre-crushing is 85-90 wt%; the total fineness (less than 3mm) of the coal as fired is 89-92 wt%, and the bulk density is more than or equal to 1.0t/m3。
In a specific embodiment, the blended coal obtained in the method is coked on a 5.5m tamping coke oven, and the obtained dry quenching coke meets the following quality indexes: m25Greater than or equal to 90 percent, and abrasion resistance M10Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent and the strength CSR after reaction more than or equal to 62 percent.
On the other hand, the invention provides blended coal for coking, wherein the blended coal comprises the following single coking coals in percentage by weight: 6-9% of weakly caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal, 12-15% of lean reducing coal,
wherein, V of the fat coaldafThe maximum Gieseler fluidity is not less than 30 percent, the maximum Gieseler fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 60 percent, or the CSR of the single coking coke of an iron box experiment is not less than 65 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 90 percent;
v of the gas fat coaldaf≤38％The Gieseler maximum fluidity is more than or equal to 10000ddpm, the plasticity interval is more than or equal to 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 50 percent, or the CSR of the single coking coke of an iron box experiment is more than or equal to 55 percent, and the proportion of 0.8 to 1.5 percent in the random reflectivity Re distribution of the coal rock phase mirror mass group is more than or equal to 30 percent;
v of the 1/3 coking coaldafLess than or equal to 35 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 40 percent or the CSR of the single coking coke of an iron box experiment is more than or equal to 45 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is more than or equal to 30 percent;
the lean coal G is more than or equal to 50 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 25 percent, or the CSR of the single coking coke of an iron box experiment is more than or equal to 30 percent, and the proportion of 0.8-1.5 percent in the distribution of the random reflectivity Re of the coal-rock phase mirror group is more than or equal to 20 percent; and
the lean coal G is more than or equal to 15,
wherein the blended coal is not blended with main coking coal.
Advantageous effects
According to the tamping coal blending coking method without main coking coal, the gas fat coal and fat coal with good coking property (represented by a coke CSR index obtained by a single coal single coking experiment) and good caking property (represented by a maximum fluidity and plasticity interval index) are combined with the lean coal and the lean coal, so that the softening melting continuity and the full connection and the coking uniformity of various coals in the coking process are ensured, and the phenomenon that different coals are respectively carbonized is avoided when the main coking coal is not blended; the quality and quantity of active components are ensured by ensuring the proportion of the strong bonding area and the bonding area in the random reflectivity distribution of the vitrinite, and the skeleton effect is achieved.
The excellent technical effects of the invention are as follows: the main coking coal is not matched, and is 20 to 30 percent lower than the common coal matching structure. On one hand, the method can reduce and slow down the consumption of coking coal resources and is suitable for the requirement of long-term development; on the other hand, the coal blending cost is reduced, and the coke profit is improved. The price difference between the coking coal and other coal types is about 300 yuan/ton, and the price of coal blending per ton can be reduced by 60-90 yuan. Meanwhile, the coke quality is ensured, and the dry quenching reaches the following quality indexes: crushing strength M25Greater than or equal to 90 percent, and abrasion resistance M10Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent, the strength CSR after reaction is more than or equal to 62 percent, the above substancesThe quality index reaches the quality level of dry quenching coke obtained by the tamping coal blending coking method of the blended coking coal in the prior art.
Drawings
FIG. 1 is a diagram of vitrinite reflectance distributions and interval ratios of example 1 of a tamping coal blending coking process without blending primary coking coal according to the present invention.
FIG. 2 is a graph of vitrinite reflectance distributions and interval ratios for example 2 of a tamping coal blending coking process without blending primary coking coal according to the present invention.
Detailed Description
The above description is only an outline of the technical solution of the present invention, and in order to make the technical content of the present invention more clear to those skilled in the art, the following specific embodiments of the present invention are specifically illustrated, however, these embodiments are not intended to limit the scope of the present invention. Operations not specifically disclosed hereinafter are all conventional in the art.
The quality index of each individual coal used in examples 1 and 2 below is shown in table 1 below.
TABLE 1
Example 1
The embodiment provides a tamping coal blending coking method, which comprises the step of blending various single coking coals, wherein the single coking coals comprise the following components in percentage by weight: 9% of weakly caking coal, 9% of gas coal, 20% of 1/3 coking coal, 21% of high-sulfur gas-fat coal, 10% of low-sulfur fat coal, 19% of lean coal and 12% of lean reducing coal.
Pre-crushing weakly caking coal and gas coal respectively, wherein the fineness (less than 3mm) after pre-crushing is 87.8 percent and 89.3 percent; then the single coals are mixed and mixed evenly according to the weight percentage, and then the mixture is put into a crusher together to ensure that the fineness of the coal as fired is 89.7 percent and the bulk density is 1.04t/m3。
The following table 2 is the quality index data of the blended coal, and meets the requirements.
TABLE 2
| Ad/％ | Vdaf/％ | St，d/％ | G value | Y value/mm | Fineness/% | |
| Standard of merit | ≤10 | 26-30 | ≤0.80 | ≥68 | ≥12.5 | 89～92 |
| Example 1 | 9.21 | 29.43 | 0.80 | 68.2 | 13.5 | 89.7 |
The following table 3 is the distribution data of the random reflectance Re of the rock phase vitrinite of the blended coal, the proportion of 0.8-1.5% in the Re distribution of the example 1 is 66.5%, wherein the proportion of 0.9-1.2% is 27.9%, and FIG. 1 shows that the reflectance distribution curve is continuous and has no obvious gap.
TABLE 3
| Re | <0.50 | 0.5-0.65 | 0.65-0.80 | 0.80-0.90 | 0.90-1.20 | 1.20-1.50 | 1.50-1.70 | 1.70-1.90 | 1.90-2.50 |
| ％ | 1.8 | 2.6 | 13.2 | 18.0 | 27.9 | 20.6 | 8.3 | 5.3 | 2.3 |
The following Table 4 shows the quality index of dry-quenched coke 1 obtained by coking the above blended coal on a 5.5m stamp-charging coke oven.
TABLE 4
| Ad/％ | St，d/％ | M25/％ | M10/％ | CRI/％ | CSR/％ | |
| Dry quenching 1 | 12.46 | 0.70 | 93.5 | 5.5 | 28.6 | 62.5 |
As can be seen from Table 4 above, the coke dry quenching obtained by the tamping blending coal coking method without blending the main coking coal achieves the following quality indexes: crushing strength M25Greater than or equal to 90 percent, and abrasion resistance M10≤6％The reactivity CRI is less than or equal to 30 percent, and the strength CSR after reaction is more than or equal to 62 percent.
Example 2
The embodiment provides a tamping coal blending coking method, which comprises the step of blending various single coking coals, wherein the single coking coals comprise the following components in percentage by weight: 6% of weakly caking coal, 6% of gas coal, 21% of 1/3 coking coal, 8% of high-sulfur gas-fat coal, 10% of low-sulfur gas-fat coal, 14% of high-sulfur fat coal, 20% of lean coal and 15% of lean-reducing coal.
Pre-crushing weakly caking coal and gas coal respectively, wherein the fineness (less than 3mm) after pre-crushing is 88.5 percent and 89.9 percent; then the single coals are mixed and mixed evenly according to the proportion, and then the mixture is fed into a pulverizer together to ensure that the fineness (less than 3mm) of the coal as fired is 89.4 percent and the bulk density is 1.03t/m3。
The following table 5 is the blended coal quality index data in example 2, and meets the requirements.
TABLE 5
| Ad/％ | Vdaf/％ | St，d/％ | G value | Y value/mm | Fineness/% | |
| Standard of merit | ≤10 | 26-30 | ≤0.80 | ≥68 | ≥12.5 | 89～92 |
| Example 2 | 9.45 | 28.23 | 0.78 | 68.5 | 14.1 | 89.4 |
The following table 6 shows the distribution data of the random reflectance Re of the rock-phase vitrinite of the blended coal in example 2, in which the proportion of 0.8-1.5% in the Re distribution of example 2 is 64.6%, and the proportion of 0.9-1.2% is 32%, and fig. 2 shows that the reflectance distribution curve is continuous and has no obvious gaps.
TABLE 6
| Re | <0.50 | 0.5-0.65 | 0.65-0.80 | 0.80-0.90 | 0.90-1.20 | 1.20-1.50 | 1.50-1.70 | 1.70-1.90 | 1.90-2.50 |
| ％ | 0.8 | 2.5 | 10.7 | 19.8 | 32.0 | 12.8 | 9.0 | 6.6 | 5.8 |
The quality index of dry-quenched coke 2 obtained by coking the blended coal of example 2 on a 5.5m stamp-charged coke oven is shown in Table 7 below.
TABLE 7
| Ad/％ | St，d/％ | M25/％ | M10/％ | CRI/％ | CSR/％ | |
| Dry quenching 2 | 12.53 | 0.68 | 94.3 | 5.2 | 27.8 | 63.7 |
From the above table 7, it can be seen that the dry quenching coke obtained by the above tamping coal blending coking method achieves the following quality indexes: crushing strength M25Greater than or equal to 90 percent, and abrasion resistance M10Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent and the strength CSR after reaction more than or equal to 62 percent.
From the results of the embodiments 1 and 2, it can be seen that the quality indexes of the blended coal and the dry quenching coke obtained by the tamping coal blending coking method without blending the main coke coal meet the requirements, so that the technical effects of reducing the coal blending cost and improving the coke profit are realized on the premise of ensuring the coke quality.
Claims (8)
1. A tamping coal blending coking method is characterized in that main coking coal is not blended, the method comprises the step of blending various single coking coals, and the single coking coals and the weight percentages thereof are as follows: 6-9% of weakly caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal, 12-15% of lean reducing coal,
wherein, V of the fat coaldafNot more than 30 percent, the Gieseler maximum fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 60 percent, or the CSR of the single coking coke of an iron box experiment is not less than 65 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase mirror mass group is not less than 90 percent；
V of the gas fat coaldafNot more than 38 percent, the Gieseler maximum fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 50 percent, or the CSR of the single coking coke of an iron box experiment is not less than 55 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 30 percent;
v of the 1/3 coking coaldafLess than or equal to 35 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 40 percent or the CSR of the single coking coke of an iron box experiment is more than or equal to 45 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is more than or equal to 30 percent;
the lean coal G is more than or equal to 50 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 25 percent, or the CSR of the single coking coke of an iron box experiment is more than or equal to 30 percent, and the proportion of 0.8-1.5 percent in the distribution of the random reflectivity Re of the coal-rock phase mirror group is more than or equal to 20 percent; and
the lean coal G is more than or equal to 15.
2. The method according to claim 1, wherein the fat coal or gas fat coal is a fat coal or gas fat coal having a sulfur content of more than 1.5%.
3. The method according to claim 1, wherein the fat coal or gas fat coal is a fat coal or gas fat coal having a sulfur content of more than 2%.
4. The method of claim 1, wherein the individual coking coals and their weight percentages are as follows: 6-9% of weakly caking coal, 6-9% of gas coal, 20-22% of 1/3 coking coal, 18-21% of gas fat coal, 10-15% of fat coal, 18-20% of lean coal and 12-15% of lean reducing coal.
5. The method according to claim 1, wherein the quality indexes of the blended coal obtained by the method are as follows: the water content is less than or equal to 12 percent, the ash content is less than or equal to 10 percent, the sulfur content is less than or equal to 0.80 percent, the bonding index G is greater than or equal to 68, and the maximum thickness Y of the colloidal layer is greater than or equal to 12.5 mm; the proportion of 0.8-1.5% in the distribution of the random reflectance Re of the coal petrography vitrinite is more than or equal to 50%, wherein the proportion of 0.9-1.2% is more than or equal to 25%, and the reflectance distribution curve is continuous and has no gaps.
6. The method according to claim 1, wherein before the mixing step, the weakly caking coal and the gas coal are pre-crushed respectively, and the fineness of less than 3mm after pre-crushing is 85-90 wt%; the fineness of the total coal as fired which is less than 3mm is 89-92 wt%, and the bulk density is more than or equal to 1.0t/m3。
7. The method of claim 1, wherein the blended coal obtained in the method is coked on a 5.5m stamp-charged coke oven and the obtained dry coke quenching meets the following quality indexes: m25Greater than or equal to 90 percent, and abrasion resistance M10Less than or equal to 6 percent, the reactivity CRI less than or equal to 30 percent and the strength CSR after reaction more than or equal to 62 percent.
8. The blended coal for coking comprises the following individual coking coals in percentage by weight: 6-9% of weakly caking coal, 6-9% of gas coal, 15-25% of 1/3 coking coal, 15-25% of gas fat coal, 10-15% of fat coal, 15-20% of lean coal, 12-15% of lean reducing coal,
wherein, V of the fat coaldafThe maximum Gieseler fluidity is not less than 30 percent, the maximum Gieseler fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 60 percent, or the CSR of the single coking coke of an iron box experiment is not less than 65 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 90 percent;
v of the gas fat coaldafNot more than 38 percent, the Gieseler maximum fluidity is not less than 10000ddpm, the plasticity interval is not less than 100 ℃, the CSR of the single coking coke of a 40kg small coke oven is not less than 50 percent, or the CSR of the single coking coke of an iron box experiment is not less than 55 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is not less than 30 percent;
v of the 1/3 coking coaldafLess than or equal to 35 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 40 percent or the CSR of the single coking coke of an iron box experiment is more than or equal to 45 percent, and the proportion of 0.8 to 1.5 percent in the distribution of the random reflectivity Re of the coal rock phase vitrinite is more than or equal to 30 percent;
the lean coal G is more than or equal to 50 percent, the CSR of the single coking coke of a 40kg small coke oven is more than or equal to 25 percent, or the CSR of the single coking coke of an iron box experiment is more than or equal to 30 percent, and the proportion of 0.8-1.5 percent in the distribution of the random reflectivity Re of the coal-rock phase mirror group is more than or equal to 20 percent; and
the lean coal G is more than or equal to 15,
wherein the blended coal is not blended with main coking coal.
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| CN113088310A (en) * | 2021-05-25 | 2021-07-09 | 山东洪达化工有限公司 | Tamping coal blending coking method, product thereof and blended coal for coking |
| CN113234458A (en) * | 2021-06-23 | 2021-08-10 | 攀钢集团攀枝花钢钒有限公司 | Tamping coal cake coal caving control method |
| CN115044385A (en) * | 2022-07-15 | 2022-09-13 | 河北中煤旭阳能源有限公司 | Method for producing low-sulfur coke by using ultra-high-sulfur gas-fat coal |
| CN115433593A (en) * | 2022-08-10 | 2022-12-06 | 武汉钢铁有限公司 | Coke oven heating method matched with fineness of coal as fired |
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| CN113088310A (en) * | 2021-05-25 | 2021-07-09 | 山东洪达化工有限公司 | Tamping coal blending coking method, product thereof and blended coal for coking |
| CN113088310B (en) * | 2021-05-25 | 2022-09-27 | 山东洪达化工有限公司 | Tamping coal blending coking method, product thereof and blended coal for coking |
| CN113234458A (en) * | 2021-06-23 | 2021-08-10 | 攀钢集团攀枝花钢钒有限公司 | Tamping coal cake coal caving control method |
| CN115044385A (en) * | 2022-07-15 | 2022-09-13 | 河北中煤旭阳能源有限公司 | Method for producing low-sulfur coke by using ultra-high-sulfur gas-fat coal |
| CN115433593A (en) * | 2022-08-10 | 2022-12-06 | 武汉钢铁有限公司 | Coke oven heating method matched with fineness of coal as fired |
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