CN112980482B - Method for coking with American coking coal participating in coal blending - Google Patents
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Abstract
The invention relates to a method for coking American coking coal by participating in coal blending, which comprises the following steps: (1) determining the vitrinite average random reflectance and distribution histogram, the caking index G and the mineral matter catalytic index MCI of the American coking coal, and dividing the American coking coal into coking coal a and lean coal a in different proportions according to classification indexes; (2) blending coal according to the following components in percentage by mass: 10-18% of gas coal, 7-16% of 1/3 coking coal, 18-26% of fat coal, 25-40% of coking coal b, 3-15% of American coking coal and 3-15% of lean coal b; (3) after blending, the mixed coal is crushed, then coking is carried out, and cooling is carried out after coke discharging. The method provides a new fine classification control index according to the characteristics of the American coking coals and controls the corresponding blending amount according to the fine classification index, so that the blending amount is enlarged when the American coking coals are utilized, and the stability of the coke quality is ensured.
Description
Technical Field
The invention belongs to the field of metallurgical coking methods, and particularly relates to a method for coking American coking coal by participating in coal blending.
Background
80% of the world's recoverable reserves of coking coal resources are concentrated in three countries, Russia (41.3%), China (21%) and the United states (17.7%). The amount of coking coal resources found in China is about 2800 hundred million tons, wherein the economically recoverable coking coal resources account for about 23 percent, but in the coking coal resources in China, the proportion of low-metamorphic gas coal and 1/3 coking coal is more, and the proportion accounts for 45.73 percent of the national coking coal resources; the coking coal is positioned at the second level and accounts for 23.61 percent. In recent years, the exploitability of high-quality coking coal in China is continuously shrinking, and the contradiction of the shortage of high-quality coking coal resources is gradually outstanding under the multiple actions of the national emphasis on energy structure adjustment, the enhancement of environmental protection requirements, the control of coal yield acceleration and the like, and particularly, the supply of the high-quality coking coal serving as an important coal type for coking and blending is more tense. China coking enterprises are mainly distributed in coastal zones and part of inland cities, water transportation in coastal areas is convenient, imported coal is needed to exist, and in recent years, the specific gravity of the imported coking coal in coal blending is continuously improved. The imported coking coal in China mainly comes from countries such as Australia, Mongolia, Canada, Russia, America, Indonesia and the like, but because coking coal formation conditions of coking coal in various regions are different, although volatile content and caking property indexes meet the classification standard of the domestic coking coal, the coking characteristics, geological characteristics and the like have characteristics of the coking coal, and the application of the imported coal types is difficult.
The document "coal quality analysis and application of American and Russian lean coking coals" (coal chemical industry, 2014(4)) introduces American Buchanan ore and Windber ore lean coking coals and volatile matter VdafRespectively 18.39 percent and 17.58 percent, the average random reflectivity of vitrinite is respectively 1.63 percent and 1.73 percent, the reactivity CRI of coke is respectively 29.9 percent and 36.1 percent, the intensity CSR of the coke after reaction is respectively 54.0 percent and 51.2 percent, the experiment shows that the coking property reaches the level of common coking coal in China, the production practice shows that the proportion of the substitute coking coal is increased, the cold and hot intensity of the coke is reduced in different degrees, and the coke quality is improved by increasing the using amount of the fat coal. However, the literature does not give the reason of coke quality reduction, does not give a specific classification and use method of the American coking coal, and the blending cost is higher due to the high use ratio of the caking coal in the blending scheme.
The volatile component of American coking coal is 18% -23%, and average random reflectivity of vitrinite
1.40% -1.60%; a bonding index G of>65-82, the maximum thickness Y of the colloidal layer is 9-18 mm, and the mineral catalytic index MCI is 5.0-11.0%. The coal belongs to coking coal according to Chinese coal classification, but the coking property is poor, and small coke oven experiments show that the thermal properties CRI and CSR of coke are 50-60 respectively% and 20-30%, which are completely different from domestic common coking coal, so that in production practice, the quality of coke is obviously deteriorated when domestic coking coal is replaced according to domestic coking coal classification, and the production requirements cannot be met.
Therefore, the American coking coal is different from the American coking coal described in the literature, and the classification, evaluation and use methods of domestic coking coal are applied, so that a good coal blending effect cannot be achieved, and high-quality coke with good economy cannot be obtained.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for coking American coking coal by participating in coal blending, which aims to overcome the defects that the coking performance of the American coking coal is lower than that of high-quality coking coal in the prior art, the traditional coal quality classification and coal blending coking method is adopted, and the post-reaction strength (CSR) of coke refined by the method is low, so that the quality requirement of high-quality metallurgical coke cannot be met.
The invention provides a method for coking American coking coal by participating in coal blending, which comprises the following steps:
(1) determination of vitrinite mean random reflectance of U.S. coking coal
And the distribution histogram, the caking index G and the mineral catalysis index MCI are calculated, and the American coking coal is divided into coking coal a and lean coal a with different proportions according to the following classification indexes:
g is less than or equal to 75 percent, and MCI is less than or equal to 6.5 percent
The accumulated content of (A) is counted as coking coal a, and the rest is counted as lean coal a;
g is less than or equal to 75 percent, and MCI is more than or equal to 6.5 percent
The accumulated content of (A) is counted as coking coal a, and the rest is counted as lean coal a;
g is more than 75, MCI is less than 6.5 percent
The accumulated content of (A) is counted as coking coal a, and the rest is counted as lean coal a;
g is greater than 75, MCI is greater than 6.5 percent
The accumulated content of (A) is counted as coking coal a, and the rest is counted as lean coal a;
wherein the content of the first and second substances,
other indexes are determined according to national standard;
(2) blending coal according to the following components in percentage by mass: 10-18% of gas coal, 7-16% of 1/3 coking coal, 18-26% of fat coal, 25-40% of coking coal b, 3-15% of American coking coal and 3-15% of lean coal b, wherein the American coking coal is divided into coking coal a and lean coal a with different proportions according to the step (1);
(3) after blending, the mixed coal is crushed, then coking is carried out, and cooling is carried out after coke discharging.
In the step (1), the volatile content of the American coke coal is 18-23%, and the vitrinite average random reflectivity
1.40-1.70%, and a bonding index G of>65-82, the maximum thickness Y of the colloidal layer is 9-18 mm, and the mineral catalytic index MCI is 5.0-11%.
The coking coal b in the step (2) is medium metamorphic coking coal, and the medium metamorphic coking coal is coking coal with vitrinite average random reflectivity of 1.15-1.30%.
The bonding index G value of the mixed coal after coal blending in the step (3) is 75-85, and the mineral substance catalytic index MCI value is 3-4%.
And (3) crushing in the step (3) to enable the mixed coal with the particle size of less than 3mm to account for 72-78% of the total mass of the mixed coal.
The step (3) of coking comprises the following steps: delivering the crushed mixed coal into a top-loading coke oven for coking, wherein the coking temperature is 1000 +/-50 ℃, and the coking time is 19 +/-2 hours.
And (4) the cooling in the step (3) adopts a dry quenching process.
And (4) after cooling in the step (3), performing coke quality detection, and determining indexes such as coke ash content, coke sulfur content, coke reactivity, strength after reaction and the like.
The invention also provides the blended coal prepared by the method.
The invention also provides application of the blended coal prepared by the method.
The coking coal in the coal blending component comprises coking coal b and coking coal a in American coking coal, and the lean coal comprises lean coal b and lean coal a in American coking coal.
The invention selects proper control indexes to finely classify the American coking coals, thereby reasonably replacing the blending proportion of domestic coking coals and lean coals, reducing the cost of blending coals under the condition of meeting certain quality requirements of the blended coals and producing high-quality metallurgical cokes with stable quality on a top-loading coke oven.
The influence factors of the thermal property of the coke are very complex, and a large number of researches show that the thermal property of the coke is mainly determined by the optical structure, the porosity and the mineral catalytic index of the coke, and the properties are directly related to various properties of raw material coal, such as the congenital property of the raw material coal, the compatibility of blended coal and the coking process condition, but the factors are not isolated and mutually influence and act together.
The American coking coal related by the invention belongs to coking coal according to domestic coal quality classification indexes, but the coking is poorer than domestic similar coking coal, and the coal forming conditions of original plants, accumulation environment, coal forming period and the like of the American coking coal and the domestic coking coal have larger difference, so that the domestic standard can not be simply used for classification of the domestic coal types. The American coking coal has high metamorphic grade and high mineral catalytic index, and can not fully play the role of domestic similar coking coal in the coking process. Through a great deal of research, from the reflectance distribution diagram, the part with lower reflectance of the American coke can be classified as the coke, and the part with higher reflectance can be classified as the lean coal. Therefore, the method reasonably divides the American coking coal into domestic similar coking coal and lean coal with different proportions according to the vitrinite average random reflectivity and distribution diagram, the caking index and the mineral substance catalytic index, thereby realizing simple coal substitution and coal blending.
Advantageous effects
(1) The method establishes a new evaluation index for the American coking coal, breaks through the traditional thought that the American coking coal is used as the coking coal, replaces part of the coking coal and the lean coal by the American coking coal according to the proportion, so that the coal blending is more convenient and better controlled, simultaneously expands the range of the coking coal, optimizes the imported coal resources and effectively relieves the contradiction between supply and demand of the domestic coking coal.
(2) The coal blending technology with the participation of American coking coal in the invention provides an optimized coking coal blending proportion through the compatibility research of different coking coals, particularly the compatibility research of the coking coals with foreign coal types, and coke produced in a common top-loading coke oven can meet the quality requirement of high-quality metallurgical coke through the equivalent control of the blending coal G, MCI, thereby ensuring that the coke meets the requirement of blast furnace ironmaking.
(3) On the basis of ensuring the quality of coke, more gas coal with high volatile matter and American coking coal with low volatile matter are blended, and because the ash sulfur content of the gas coal and the American coking coal is low, high-sulfur fat coal and the coking coal with low price can be blended, so that the cost of blending coal is further reduced.
Drawings
FIG. 1 is a graph showing the random reflectance distribution of vitrinite from the American coking coal according to the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
(1) According to the current national standard measuring method, the conventional coking coal testing indexes such as vitrinite average random reflectivity and distribution diagram, caking index, mineral catalytic index MCI and the like of the American coking coal are measured.
Through detection, the volatile content of the American coking coal is 18-19%, and the average random reflectivity of vitrinite is
1.40-1.50%, and a bonding index G of>78-80, the maximum thickness Y of the colloidal layer is 9-11 mm, and the mineral catalytic index MCI is 9.0-11%.
Wherein the content of the first and second substances,
according to G > 75 and MCI > 6.5%, then
The accumulated content of (A) is counted as coking coal a, and the rest is counted as lean coal a;
according to the random reflectivity distribution diagram of vitrinite of American coking coal (figure 1), will
The accumulated content of the coke is calculated as coking coal a, the rest is lean coal a, and the coking coal a: and (3) taking the American coking coal as coking coal a and the lean coal a to participate in coal blending according to the proportion.
(2) Blending coal according to the following mass percent: 15-18% of gas coal, 13-16% of 1/3 coking coal, 20-26% of fat coal, 25-35% of coking coal b, 3-12% of American coking coal and 8-15% of lean coal b; the coking coal b is medium metamorphic coking coal, the medium metamorphic coking coal is coking coal with vitrinite average random reflectance of 1.20-1.25%, and the coal quality of other single coking coal meets the classification index of the corresponding national standard. The specific blending ratio of the coal is shown in the table 1, and the American coke coal is not blended in the scheme 1; scheme 2 is that American coking coal directly replaces domestic coking coal by 3 percent; scheme 3 is that American coking coal replaces 8% of domestic coking coal, but the proportion of caking high-sulfur fat coal is adjusted; schemes 4 and 5 show the ratio of coking coal to lean coal adjusted according to the invention.
TABLE 1 coking coal blending (mass percent) and coke mass data sheet
(3) After blending, the mixed coal is crushed by a back-hammer crusher, and the mixed coal with the particle size of less than 3mm accounts for 75-78% of the total mass of the mixed coal.
(4) And (3) delivering the crushed mixed coal into a 6m top-mounted coke oven for coking, wherein the coking temperature is 1050 ℃, and the coking time is 19 hours.
(5) And cooling by adopting a nitrogen dry quenching process after coke discharge.
From the five schemes in table 1, scheme 2 simply replaces coking coal to result in a reduction in CSR, scheme 3 achieves the purpose of stabilizing coke quality by increasing the amount of fat coal after increasing the blending ratio of american coking coal, and schemes 1-3 show that: in the coking process of the American coking coal, the function of the coking coal cannot be fully exerted, the traditional mode cannot be simply adopted to replace the coking coal, and the function of the American coking coal, which plays a role in the coking process, is emphasized. Therefore, schemes 4 and 5 adopt the American coking coal alternative scheme of the invention to lead the American coking coal to be based on the control indexes G, MCI and RranThe proportion of the coking coal and the lean coal is calculated, so that the coking coal and the lean coal are replaced correspondingly, and the aim of improving the quality of the coke is fulfilled from the aspect of the quality of the coke.
Claims (8)
1. A method for coking American coking coal by participating in coal blending comprises the following steps:
(1) determination of vitrinite mean random reflectance of U.S. coking coal
And the distribution histogram, the caking index G and the mineral catalysis index MCI are calculated, and the American coking coal is divided into coking coal a and lean coal a with different proportions according to the following classification indexes:
g is less than or equal to 75 percent, and MCI is less than or equal to 6.5 percent
The accumulated content of less than or equal to 1.45 percent is calculated as coking coal a, and the rest is lean coal a;
g is less than or equal to 75 percent, and MCI is more than or equal to 6.5 percent
The accumulated content of less than or equal to 1.35 percent is calculated as coking coal a, and the rest is lean coal a;
g is more than 75, MCI is less than 6.5 percent
The accumulated content of less than or equal to 1.55 percent is calculated as coking coal a, and the rest is lean coal a;
g is greater than 75, MCI is greater than 6.5 percent
The accumulated content of less than or equal to 1.45 percent is calculated as coking coal a, and the rest is lean coal a;
wherein the content of the first and second substances,
other indexes are determined according to national standard, the volatile matter of the American coke coal is 18-23%, and the average random reflectivity of vitrinite is
1.40-1.70%, and a bonding index G of>65-82, the maximum thickness Y of the colloidal layer is 9-18 mm, and the mineral catalytic index MCI is 5.0-11%;
(2) blending coal according to the following components in percentage by mass: 10-18% of gas coal, 7-16% of 1/3 coking coal, 18-26% of fat coal, 25-40% of coking coal b, 3-15% of American coking coal and 3-15% of lean coal b, wherein the American coking coal is divided into coking coal a and lean coal a with different proportions according to the step (1), the coking coal b is medium metamorphic coking coal, and the American coking coal is used for replacing part of the coking coal b and the lean coal b according to the proportion;
(3) after blending, the mixed coal is crushed, then coking is carried out, and cooling is carried out after coke discharging.
2. The method of claim 1, wherein the medium metamorphic coking coal in step (2) is coking coal having a vitrinite mean random reflectance of between 1.15% and 1.30%.
3. The method according to claim 1, wherein the mixed coal caking index G after coal blending in the step (3) is 75-85, and the mineral catalysis index MCI is 3-4%.
4. The method according to claim 1, wherein the step (3) is carried out by crushing so that the mixed coal having a particle size of 3mm or less accounts for 72 to 78% by mass of the total mass of the coal.
5. The method according to claim 1, wherein the coking in the step (3) is: delivering the crushed mixed coal into a top-loading coke oven for coking, wherein the coking temperature is 1000 +/-50 ℃, and the coking time is 19 +/-2 hours.
6. The method of claim 1, wherein the cooling in step (3) is performed by a dry quenching process.
7. A blended coal prepared by the method of claim 1.
8. Use of the blended coal prepared by the method of claim 1.
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