CN118447952A - Method for predicting coke quality by utilizing coking coal vitrinite reflectivity, inert component content and Gibbs maximum fluidity - Google Patents
Method for predicting coke quality by utilizing coking coal vitrinite reflectivity, inert component content and Gibbs maximum fluidity Download PDFInfo
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- 239000004079 vitrinite Substances 0.000 title claims abstract description 33
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- 230000009257 reactivity Effects 0.000 claims abstract description 60
- 238000012067 mathematical method Methods 0.000 claims abstract description 5
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 24
- 238000007873 sieving Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The invention relates to a method for predicting coke quality by utilizing the reflectivity of coking coal vitrinite, the content of inert components and the maximum Gibbs fluidity, which uses the reflectivity of vitrinite, the content of inert components and the maximum Gibbs fluidity to characterize and quantify the quality characteristics of single coal, adopts a mathematical method to establish a ternary control chart of coke crushing strength, coke wear resistance, coke thermal reactivity and coke strength after reaction, evaluates the quality of coking coal, provides effective guidance for coking and blending coal, and achieves the purposes of controlling and improving the coke quality.
Description
Technical Field
The invention relates to the technical field of coking, in particular to a method for predicting coke quality by utilizing the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum Gibbs fluidity.
Background
Coke is an irregular carbonaceous porous body containing cracks and defects. Coke is the main raw fuel for blast furnace smelting, and has high cold state strength in the blast furnace to resist mechanical impact and abrasion of the coke in the descending process of the lump zone. The crushing strength of coke refers to the ability of the coke to resist external impact forces without breaking along cracks or defects in the structure. The abrasion resistance of coke refers to the ability of the coke to resist friction without generating surface debris or powder.
In recent years, with the development of blast furnace smelting technology, particularly the development of large-sized blast furnace volume, high-wind-temperature technology and blast oxygen-enriched coal injection technology, the effect of coke on a material column skeleton in a blast furnace and the effect of ensuring ventilation and liquid permeation of the coke are more remarkable. Not only is the coke in the blast furnace required to have a certain crushing strength (supporting the upper furnace burden) and a certain wear resistance to maintain the air permeability of the blast furnace, but also higher requirements are placed on the thermal reactivity of the coke and the strength after the coke reaction.
The thermal reactivity of the coke is primarily modeled as the ability of the coke to react with CO2 gasification (dissolution loss) before entering the tuyere convolution zone in the blast furnace. The coke and the carbon dioxide are gasified, the coke loses weight under the erosion action to generate cracks, the inner pore wall is thinned, the strength of the coke is reduced, and the damage of the coke is accelerated. If the reactivity of the coke in the reflow zone is too large, the gas utilization degree is poor, the coke ratio is increased, more fragments are generated by the breakage of the coke and the gas permeability of the blast furnace charging column is also deteriorated, and the smooth running of the blast furnace is affected. The coke thermal reactivity has great influence on blast furnace smelting and becomes one of key factors for limiting stable, balanced, high-quality and high-efficiency production of molten iron by the blast furnace. In order to increase the carbon dioxide content in the top gas, improve the gas utilization degree, make the hearth temperature and gas flow distribution more reasonable, the furnace burden smoothly descends, improve the supporting function of the coke framework, and require the thermal reactivity (CRI) of the coke at a certain temperature to be as small as possible.
Post-reaction strength (CSR) of coke measures the ability of the coke to maintain high temperature strength under conditions of exposure to CO2 and alkali metal attack. The coke and the carbon dioxide are gasified, the coke loses weight under the erosion action to generate cracks, the inner pore wall is thinned, the strength of the coke is reduced, and the damage of the coke is accelerated. If the reactivity of the coke in the reflow zone is too large, the gas utilization degree is poor, the coke ratio is increased, more fragments are generated by the breakage of the coke and the gas permeability of the blast furnace charging column is also deteriorated, and the smooth running of the blast furnace is affected. The strength of the coke after reaction has great influence on blast furnace smelting, and becomes one of key factors for limiting stable, balanced, high-quality and high-efficiency production of molten iron by the blast furnace. In order to increase the carbon dioxide content in the top gas and improve the gas utilization degree, the hearth temperature and the gas flow distribution are more reasonable, the furnace burden is smoothly lowered, the supporting effect of a coke framework is improved, and the strength (CSR) of the coke after reaction at a certain temperature is required to be as high as possible.
The above demands on coke quality are intangible and put forward higher demands on coking and coal blending operation, and the influence of single coal quality on coke crushing strength, coke abrasion resistance, coke thermal reactivity and coke strength after reaction needs to be studied in depth, a corresponding control model is established, and the coke quality is accurately controlled in the range required by blast furnace operation through optimizing coal blending.
The method for establishing the prediction model and the control method of the coke crushing strength, the coke wear resistance, the coke thermal reactivity and the strength after the coke reaction has important significance for selecting the economic coal blending ratio, predicting and controlling the coke quality and managing the coal yard in the coking plant. The coal resources of each country are different, the coal strategies of each coking plant are different, the evaluation indexes and the testing methods are different, and the prediction methods of the coal blending management parameters, the coke crushing strength, the coke abrasion resistance, the coke thermal reactivity, the strength after the coke reaction and the like are different. In recent years, researchers at home and abroad have conducted a great deal of research about the objectives of coke crushing strength, coke abrasion resistance, coke thermal reactivity and prediction of strength after coke reaction to improve coke quality, and can be roughly divided into the following:
(1) Predicting by using coal-rock parameters, such as SI-CBI method (strength index and composition balance index method) in the United states, etc.;
(2) The volatile and technological parameters are used for prediction, such as a V-Y method (volatile-colloid layer index method), a V-G method (volatile-adhesive index method), a V-TD method (volatile-total expansion degree method) in the United kingdom and a V-CSN method (volatile-crucible expansion ordinal number method) in Canada which are commonly used in China;
(3) Predicting by volatile matter and process parameters, such as R-G method (specular reflectance-bond index method), japanese MOF method (specular reflectance-Gibbs maximum fluidity method), etc.;
(4) Predictions are made using coking process conditions, such as the G-factor method of Germany.
(5) The prediction is performed by using a coal ash catalytic index, such as an MCI index method or an MBI index method.
The properties of coking coals are mainly determined by the degree of deterioration, caking fusion properties, and the content and proportion of active and inert components in the coal. The coal rock blending coal is characterized by the degree of coalification by the reflectivity of a vitrinite, and the balance index of the components is characterized by the content of inert components and the optimal ratio, so that the technological property of the coal is lack of characterization.
The composition and structure of coking coal are very complex and very non-uniform, and the above-mentioned technological parameters only represent the technological characteristics of a certain aspect of coking coal, and can not reflect the difference of coal rock components and vitrinite quality.
Coking coals with the same deterioration degree and similar coal and rock composition can have larger difference in coking characteristics. The limitation exists in predicting the coke crushing strength, the coke wear resistance, the coke thermal reactivity or the strength after the coke reaction only by the reflectivity of the vitrinite and the content of the components of the coal and the rock, and the difference of the characteristic parameters of the coal and the rock are insufficient to reflect the plastic change of the coking coal in the heating process. Therefore, it is necessary to introduce parameters reflecting the plastic changes to make up for the shortfall of the coal rock parameters.
Disclosure of Invention
The invention provides a method for predicting coke quality by utilizing the reflectivity of coking coal vitrinite, the content of inert components and the maximum Gibby fluidity, which is based on a coal rock coal blending theory, adopts parameters such as the reflectivity of the vitrinite, the content of inert components and the maximum Gibby fluidity of single coking coal to establish a ternary coal blending model, establishes a control chart related to the crushing strength of coke, the wear-resistant strength of coke, the thermal reactivity of coke and the strength after the coke reaction, provides effective guidance for coking coal blending, and achieves the purposes of controlling and improving the coke quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
A method for predicting coke quality by utilizing the reflectivity of coking coal mirror body, the content of inert components and the maximum Gibbs fluidity features and quantifies the quality characteristics of single coal by utilizing the reflectivity of the mirror body, the content of inert components and the maximum Gibbs fluidity, establishes a ternary control diagram of coke crushing strength, coke wear resistance, coke thermal reactivity and coke strength after reaction by adopting a mathematical method, evaluates the quality of coking coal and controls the coke quality on the basis.
A method for predicting coke quality by utilizing the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum Gibbs fluidity specifically comprises the following steps:
1) Performing a single coal vitrinite reflectance test to obtain a single coal vitrinite reflectance
2) Quantification of coal rock microcomponents: testing the contents of vitrinite V, inertinite I and chitin E in each single coal; assuming a relative density of 1.35 for the micro-components in the coking coal and a relative density of 2.8 for the minerals, the mass fraction of minerals according to the Parr formula is:
1.08XA d+0.55×St,d … … (1)
Wherein: a d -dry ash, mass fraction;
S t,d— dry basis total sulfur content, mass percent;
The mineral volume content MM is corrected for ash and sulfur content as shown in formula (2):
Calculating the individual coal inert component content TI according to formula (3):
Ti=i+mm … … (3)
3) Performing a Gibbs maximum fluidity test to obtain a Gibbs maximum fluidity lgMF of single coal;
4) Performing coke quality tests, including a coke crushing strength test, a coke abrasion resistance test, a coke thermal reactivity test and a coke post-reaction strength test; obtaining the coke crushing strength M 40, the coke abrasion resistance M 10, the coke thermal reactivity CRI and the coke strength CSR of single coal after reaction;
5) Normalizing the data; reflectivity to mirror body The inert component content TI and the Gibbs maximum fluidity lgMF are normalized, and the normalization equation is as follows:
Wherein: r i -properties normalized for the i-th single coal; r i -properties of the i-th single coal; r max -the maximum value of property r; r min -minimum of property r;
6) Drawing a coke quality control chart, including a coke crushing strength control chart, a coke wear resistance control chart, a coke thermal reactivity control chart and a coke post-reaction strength control chart; wherein:
Coke crushing strength control chart is based on specular reflectivity Establishing a contour map of coke crushing strength M 40 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
The coke wear-resistant strength control chart is based on the reflectivity of a mirror body Establishing a contour map of the coke wear resistance M 10 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
coke thermal reactivity control is based on specular reflectance Establishing a contour map of coke thermal reactivity CRI in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
Intensity control graph after coke reaction is obtained by using specular reflectivity Taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis, and establishing a contour map of the intensity CSR after coke reaction in a triangular coordinate system.
Furthermore, in the step 1), the single coal vitrinite reflectance, that is, the average maximum vitrinite reflectance, is tested according to GB/T6948-2008 method for measuring the vitrinite reflectance of coal by using a microscope, the number of test points is not less than 100 points, and the average mu of the test data is calculated to obtain the vitrinite reflectance
Further, in the step 2), the contents of vitrinite V, inertinite I and chitin E in each individual coal were tested according to GB/T8899-201 methods for determining microscopic group and mineral of coal.
Further, in the step 3), ji's maximum fluidity lgMF of single coal is tested according to GB/T25213-2010 "constant moment Ji plastometer method of plasticity of coal".
Further, in the step 4), the coke crushing strength test is performed by using a coke oven test, which is specifically as follows:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test crushing strength M 40 of coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by 40mm, and weighing;
Crushing strength of coke: m 40＝m1/m.times.100% … … (formula 5)
Wherein, m: charging drum coke mass, kg;
m 1: the mass of coke after the drum is discharged is more than 40mm, kg.
Further, in the step 4), the coke abrasion resistance test is performed by using a coke oven experiment, and specifically the method comprises the following steps:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test the wear resistance M 10 of the coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by using 10mm, and weighing;
Abrasion resistance of coke: m 10＝m2/m.times.100% … … (formula 6)
Wherein, m: charging drum coke mass, kg;
m 2: the mass of coke less than 10mm after the drum is discharged is kg.
Further, in the step 4), the coke thermal reactivity test is performed by using a coke oven test, which is specifically as follows:
testing the thermal reactivity CRI of the coke according to GB/T4000-2008 method for testing reactivity and strength after reaction; get greater than Crushing and dividing the coke of 20kg by a jaw crusher to obtain 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, and reacts with carbon dioxide with the flow of 5L/min for 2 hours at the temperature of 1100+/-5 ℃, and the coke reactivity CRI is expressed as the percentage of the mass loss of the coke;
Cri= (m 3-m4)/mx100% … … (formula 7)
Wherein, m 3: coke mass before reaction, g;
m 4: residual coke mass g after reaction.
Further, in the step 4), the strength test after the coke reaction is performed by using a coke oven experiment, which is specifically as follows:
Testing the post-reaction strength CSR of the coke according to GB/T4000-2008 method for testing reactivity and post-reaction strength of Coke; get greater than 20Kg of coke, crushing and dividing the coke by a jaw crusher, and dividing the coke into 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, reacts with carbon dioxide with the flow of 5L/min for 2 hours at 1100+/-5 ℃, and after I-type rotary drum test, the strength CSR of the coke after reaction is expressed by the mass fraction of the coke with the particle size of more than 10mm accounting for the coke after reaction;
Csr= (m 5-m6)/mx100% … … (formula 8)
Wherein, m 5: residual coke mass g after reaction;
m 6: and g, the mass of the granular coke after the drum is larger than 10mm.
Further, in the step 6), the data analysis method includes polynomial regression, inverse distance weighted interpolation, kriging, minimum curvature, improvement Xie Biede, natural neighbor, nearest neighbor, radial basis function, linear interpolation trigonometry, moving average and local polynomial.
Compared with the prior art, the invention has the beneficial effects that:
1) Based on a coal-rock coal blending theory, a ternary coal blending model is built by adopting parameters such as the vitrinite reflectivity, the inert component content, the Gibbs maximum fluidity and the like of single coking coal, a control chart related to the crushing strength of coke, the wear resistance of the coke, the thermal reactivity of the coke and the strength after the coke reaction is built, effective guidance is provided for coking coal blending, and the purposes of controlling and improving the quality of the coke are achieved.
2) Coking coal forms two parts of a fusible component (active component) and a non-fusible component (inert component) in the coking process; the reflectivity of the lens body is the most scientific characterization parameter of the coking coal deterioration degree. For coking coals in a certain modification stage, coke with better crushing strength can be prepared only by mixing inert components and active components in the most proper proportion.
3) The Gibbs maximum fluidity can reflect the quantity of the colloid and reflect the quality of the colloid, and the higher the Gibbs maximum fluidity of coking coal is, the better the fluidity of the colloid is, so that solid particles can flow and adhere between coal particles sufficiently, and higher-quality coke is obtained; the Gibbs maximum fluidity has strong capability of distinguishing the bonding characteristics of the low-metamorphic coking coal, is sensitive to the property change of the coking coal, and is suitable for the conditions of low-metamorphic coking coal and various coal sources.
4) The invention has reasonable design index, scientifically characterizes and quantifies the quality characteristics of single coking coal by using the reflectivity of a lens body, the content of inert components and the maximum Gibbs fluidity, establishes three-way control charts of four coke quality related indexes by using a mathematical method, effectively overcomes the defects existing in the prior coking coal use and coking coal blending process, realizes scientific evaluation of the quality of the coking coal, and provides quantitative guidance for accurately controlling the quality of the coke, thereby achieving the purposes of stabilizing and improving the quality of the coke.
5) The method disclosed by the invention is simple to operate and easy to realize, and can effectively improve the quality stability of the coke for the blast furnace.
Drawings
FIG. 1 is a ternary control diagram for coke crushing strength M 40 according to an example of the present invention.
Fig. 2 is a graph showing a predicted area (hatched portion in the figure) of the coke crushing strength M 40 in the coal blending scheme 1 according to the embodiment of the present invention.
Fig. 3 is a graph showing a predicted area (hatched portion in the figure) of the coke crushing strength M 40 in the coal blending scheme 2 according to the embodiment of the present invention.
Fig. 4 is a graph showing a predicted area (hatched portion in the figure) of the coke crushing strength M 40 in the coal blending scheme 3 according to the embodiment of the present invention.
FIG. 5 is a ternary control diagram for the abrasion resistance M 10 of coke according to an example of the present invention.
Fig. 6 is a graph showing a predicted area (hatched portion in the figure) of the coke abrasion resistance M 10 in the coal blending scheme 1 according to the embodiment of the present invention.
Fig. 7 is a graph showing a predicted area (hatched portion in the figure) of the coke abrasion resistance M 10 according to the coal blending scheme 2 of the present invention.
Fig. 8 is a graph showing a predicted area (hatched portion in the figure) of the coke abrasion resistance M 10 in the coal blending scheme 3 according to the embodiment of the present invention.
Fig. 9 is a graph of CRI ternary control for coke thermal reactivity according to an embodiment of the invention.
Fig. 10 shows the CRI prediction area (hatched portion in the figure) of the coke thermal reactivity of the coal blending scheme 1 according to the embodiment of the present invention.
Fig. 11 shows the CRI prediction area (hatched portion in the figure) of the coke thermal reactivity of the coal blending scheme 2 according to the embodiment of the present invention.
Fig. 12 shows the CRI prediction area (hatched portion in the figure) of the coke thermal reactivity of the coal blending scheme 3 according to the embodiment of the present invention.
FIG. 13 is a chart of ternary control of the strength CSR after reaction of coke according to an embodiment of the invention.
Fig. 14 shows the predicted area (hatched portion) of the intensity CSR after coke reaction in the coal blending scheme 1 according to the embodiment of the present invention.
Fig. 15 shows the predicted area (hatched portion) of the intensity CSR after coke reaction in the coal blending scheme 2 according to the embodiment of the present invention.
Fig. 16 shows the predicted area (hatched portion) of the intensity CSR after coke reaction in the coal blending scheme 3 according to the embodiment of the present invention.
Detailed Description
According to the method for predicting coke quality by utilizing the coking coal vitrinite reflectivity, the inert component content and the Gibbs maximum fluidity, quality characteristics of single coal are represented and quantized by using the vitrinite reflectivity, the inert component content and the Gibbs maximum fluidity, a ternary control chart of coke crushing strength, coke wear resistance, coke thermal reactivity and coke strength after reaction is established by adopting a mathematical method, the quality of coking coal is evaluated, and the coke quality is controlled on the basis.
The invention discloses a method for predicting coke quality by utilizing the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum Gibbs fluidity, which specifically comprises the following steps:
1) Performing a single coal vitrinite reflectance test to obtain a single coal vitrinite reflectance
2) Quantification of coal rock microcomponents: testing the contents of vitrinite V, inertinite I and chitin E in each single coal; assuming a relative density of 1.35 for the micro-components in the coking coal and a relative density of 2.8 for the minerals, the mass fraction of minerals according to the Parr formula is:
1.08XA d+0.55×St,d … … (1)
Wherein: a d -dry ash, mass fraction;
S t,d— dry basis total sulfur content, mass percent;
The mineral volume content MM is corrected for ash and sulfur content as shown in formula (2):
Calculating the individual coal inert component content TI according to formula (3):
Ti=i+mm … … (3)
7) Performing a Gibbs maximum fluidity test to obtain a Gibbs maximum fluidity lgMF of single coal;
8) Performing coke quality tests, including a coke crushing strength test, a coke abrasion resistance test, a coke thermal reactivity test and a coke post-reaction strength test; obtaining the coke crushing strength M 40, the coke abrasion resistance M 10, the coke thermal reactivity CRI and the coke strength CSR of single coal after reaction;
9) Normalizing the data; reflectivity to mirror body The inert component content TI and the Gibbs maximum fluidity lgMF are normalized, and the normalization equation is as follows:
Wherein: r i -properties normalized for the i-th single coal; r i -properties of the i-th single coal; r max -the maximum value of property r; r min -minimum of property r;
10 Drawing a coke quality control chart, including a coke crushing strength control chart, a coke wear resistance control chart, a coke thermal reactivity control chart and a coke post-reaction strength control chart; wherein:
Coke crushing strength control chart is based on specular reflectivity Establishing a contour map of coke crushing strength M 40 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
The coke wear-resistant strength control chart is based on the reflectivity of a mirror body Establishing a contour map of the coke wear resistance M 10 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
coke thermal reactivity control is based on specular reflectance Establishing a contour map of coke thermal reactivity CRI in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
Intensity control graph after coke reaction is obtained by using specular reflectivity Taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis, and establishing a contour map of the intensity CSR after coke reaction in a triangular coordinate system.
Furthermore, in the step 1), the single coal vitrinite reflectance, that is, the average maximum vitrinite reflectance, is tested according to GB/T6948-2008 method for measuring the vitrinite reflectance of coal by using a microscope, the number of test points is not less than 100 points, and the average mu of the test data is calculated to obtain the vitrinite reflectance
Further, in the step 2), the contents of vitrinite V, inertinite I and chitin E in each individual coal were tested according to GB/T8899-201 methods for determining microscopic group and mineral of coal.
Further, in the step 3), ji's maximum fluidity lgMF of single coal is tested according to GB/T25213-2010 "constant moment Ji plastometer method of plasticity of coal".
Further, in the step 4), the coke crushing strength test is performed by using a coke oven test, which is specifically as follows:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test crushing strength M 40 of coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by 40mm, and weighing;
Crushing strength of coke: m 40＝m1/m.times.100% … … (formula 5)
Wherein, m: charging drum coke mass, kg;
m 1: the mass of coke after the drum is discharged is more than 40mm, kg.
Further, in the step 4), the coke abrasion resistance test is performed by using a coke oven experiment, and specifically the method comprises the following steps:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test the wear resistance M 10 of the coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by using 10mm, and weighing;
Abrasion resistance of coke: m 10＝m2/m.times.100% … … (formula 6)
Wherein, m: charging drum coke mass, kg;
m 2: the mass of coke less than 10mm after the drum is discharged is kg.
Further, in the step 4), the coke thermal reactivity test is performed by using a coke oven test, which is specifically as follows:
testing the thermal reactivity CRI of the coke according to GB/T4000-2008 method for testing reactivity and strength after reaction; get greater than Crushing and dividing the coke of 20kg by a jaw crusher to obtain 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, and reacts with carbon dioxide with the flow of 5L/min for 2 hours at the temperature of 1100+/-5 ℃, and the coke reactivity CRI is expressed as the percentage of the mass loss of the coke;
Cri= (m 3-m4)/mx100% … … (formula 7)
Wherein, m 3: coke mass before reaction, g;
m 4: residual coke mass g after reaction.
Further, in the step 4), the strength test after the coke reaction is performed by using a coke oven experiment, which is specifically as follows:
Testing the post-reaction strength CSR of the coke according to GB/T4000-2008 method for testing reactivity and post-reaction strength of Coke; get greater than 20Kg of coke, crushing and dividing the coke by a jaw crusher, and dividing the coke into 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, reacts with carbon dioxide with the flow of 5L/min for 2 hours at 1100+/-5 ℃, and after I-type rotary drum test, the strength CSR of the coke after reaction is expressed by the mass fraction of the coke with the particle size of more than 10mm accounting for the coke after reaction;
Csr= (m 5-m6)/mx100% … … (formula 8)
Wherein, m 5: residual coke mass g after reaction;
m 6: and g, the mass of the granular coke after the drum is larger than 10mm.
Further, in the step 6), the data analysis method includes polynomial regression, inverse distance weighted interpolation, kriging, minimum curvature, improvement Xie Biede, natural neighbor, nearest neighbor, radial basis function, linear interpolation trigonometry, moving average and local polynomial.
In order to make the purposes, technical schemes and technical effects of the invention clearer, the technical schemes in the embodiments of the invention are clearly and completely described. The embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art without the benefit of the teachings of this invention, are intended to be within the scope of the invention.
The following 3 examples illustrate coking coals for a large coking enterprise producing 255 ten thousand tons of coke in a year, using a 4-seat 52-hole JNX-2 reheating type lower focusing furnace.
[ Example 1]
The coal blending scheme 1 uses 8 kinds of single coals, and the quality characteristics and the respective coke indexes of the single coals are shown in table 1. Parameters after normalization treatment of the single coal quality characteristics are shown in table 2.
Table 1 quality characteristics of individual coals and respective coke indices
Table 2 parameters after normalization of individual coal quality characteristics
The experimental configuration for 8 individual coals was formulated as shown in table 3, with an R weight of 48.35 (normalized), a TI weight of 50.786 (normalized), and a lgMF weight of 47.498 (normalized).
Table 3 Experimental formulation
| Coal type | Coal 1 | Coal 2 | Coal 3 | Coal 4 | Coal 5 | Coal 6 | Coal 7 | Coal 8 |
| Proportion/% | 12 | 16 | 18 | 12 | 10 | 14 | 8 | 10 |
This example uses a three-way control chart of coke crushing strength (as shown in FIG. 1) to calculate the crushing strength M 40 (hatched in FIG. 2) of the blended coal. In this example, the crushing strength M 40 of the coke refined by 40kg coke oven was 67.9%, and the deviation was very small in the control range of the predicted value.
This example uses a ternary control diagram of coke abrasion resistance (as shown in fig. 5) to calculate the abrasion resistance M 10 (shaded in fig. 6) of the blended coal. In the embodiment, the abrasion resistance M 10 of the coke refined by using 40kg coke oven is 13.1%, and the deviation is very small within the control range of the predicted value.
In this example, the thermal reactivity CRI (hatched portion in fig. 10) of the blended coal was calculated using a coke thermal reactivity ternary control diagram (as shown in fig. 9). In this example, the thermal reactivity CRI of coke produced by using 40kg coke oven was 28.6%, and the deviation was extremely small within the control range of the predicted value.
In this example, the post-reaction intensity CSR (hatched portion in FIG. 14) of the blended coal was calculated using a three-way control chart of the post-reaction intensity of coke (as shown in FIG. 13). In this example, the strength CSR after the reaction of refining coke using 40kg coke oven was 58.9%, and the deviation was extremely small within the control range of the predicted value.
[ Example 2]
The coal blending scheme 2 used 8 kinds of single coals, and the quality characteristics of the single coals and the respective coke indexes are shown in table 4. Parameters after normalization treatment of the individual coal quality characteristics are shown in table 5.
TABLE 4 quality characteristics of individual coals and Coke index
TABLE 5 parameters after normalization of individual coal quality characteristics
The experimental configuration for 8 individual coals was formulated as shown in table 6, with an R weight of 44.252 (normalized), a TI weight of 51.364 (normalized), and a lgMF weight of 74.694 (normalized).
Table 6 Experimental formulation
| Coal type | Coal 1 | Coal 2 | Coal 3 | Coal 4 | Coal 5 | Coal 6 | Coal 7 | Coal 8 |
| Proportion/% | 10 | 20 | 12 | 20 | 16 | 8 | 8 | 6 |
This example uses a three-way control chart of coke crushing strength (as shown in FIG. 1) to calculate the crushing strength M 40 (hatched in FIG. 3) of the blended coal. In this example, the crushing strength M 40 of the coke refined by 40kg coke oven was 71.2%, and the deviation was very small in the control range of the predicted value.
This example uses a ternary control diagram of coke abrasion resistance (as shown in fig. 5) to calculate the abrasion resistance M 10 (shaded in fig. 7) of the blended coal. In the embodiment, the abrasion resistance M 10 of the coke refined by using 40kg coke oven is 10.9%, and the deviation is very small within the control range of the predicted value.
In this example, the thermal reactivity CRI (hatched portion in fig. 11) of the blended coal was calculated using a coke thermal reactivity ternary control diagram (as shown in fig. 9). In this example, the thermal reactivity CRI of coke produced by using 40kg coke oven was 24.3%, and the deviation was extremely small within the control range of the predicted value.
In this example, the post-reaction intensity CSR (hatched portion in FIG. 15) of the blended coal was calculated using a three-way control chart of the post-reaction intensity of coke (as shown in FIG. 13). In this example, the intensity CSR after the reaction for refining coke using 40kg coke oven was 62.4%, and the deviation was extremely small within the control range of the predicted value.
[ Example 3]
The coal blending scheme 3 uses 6 kinds of single coals, and the quality characteristics of the single coals and the respective coke indexes are shown in table 7. Parameters after normalization treatment of the single coal quality characteristics are shown in table 8.
TABLE 7 quality characteristics of individual coals and Coke index
Table 8 parameters after normalization of individual coal quality characteristics
The ratios of the 6 individual coals were formulated as shown in table 9, with an R weight of 68.472 (normalized), a TI weight of 45.776 (normalized), and a lgMF weight of 50.334 (normalized).
Table 9 Experimental formulation
| Coal type | Coal 1 | Coal 2 | Coal 3 | Coal 4 | Coal 5 | Coal 6 |
| Proportion/% | 8 | 22 | 26 | 20 | 16 | 8 |
This example uses a three-way control chart of coke crushing strength (as shown in FIG. 1) to calculate the crushing strength M 40 (hatched in FIG. 4) of the blended coal. In this example, the crushing strength M 40 of the coke refined by using 40kg coke oven was 69.3%, and the deviation was very small in the control range of the predicted value.
This example uses a ternary control diagram of coke abrasion resistance (as shown in fig. 5) to calculate the abrasion resistance M 10 (shaded in fig. 8) of the blended coal. In the embodiment, the abrasion resistance M 10 of the coke refined by using 40kg coke oven is 10.7%, and the deviation is very small within the control range of the predicted value.
This example uses a ternary control diagram of coke reactivity (as shown in fig. 9) to calculate the CRI (shaded in fig. 12) of the thermal reactivity of the blended coal. In this example, the thermal reactivity CRI of coke prepared by using 40kg coke oven was 25.5%, and the deviation was extremely small within the control range of the predicted value.
In this example, the post-reaction intensity CSR (hatched portion in FIG. 16) of the blended coal was calculated using a three-way control chart of the post-reaction intensity of coke (as shown in FIG. 13). In this example, the strength CSR after the reaction for refining coke using 40kg coke oven was 61.3%, and the deviation was extremely small within the control range of the predicted value.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. A method for predicting coke quality by utilizing the reflectivity of coking coal mirror body, the content of inert components and the maximum Gibbs fluidity is characterized in that the quality characteristics of single coal are characterized and quantified by utilizing the reflectivity of the mirror body, the content of inert components and the maximum Gibbs fluidity, a ternary control chart of coke crushing strength, coke wear resistance, coke thermal reactivity and coke strength after reaction is established by adopting a mathematical method, the quality of coking coal is evaluated, and the coke quality is controlled on the basis.
2. The method for predicting coke quality by using the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum Gibbs fluidity according to claim 1, which is characterized by comprising the following steps:
1) Performing a single coal vitrinite reflectance test to obtain a single coal vitrinite reflectance
2) Quantification of coal rock microcomponents: testing the contents of vitrinite V, inertinite I and chitin E in each single coal; assuming a relative density of 1.35 for the micro-components in the coking coal and a relative density of 2.8 for the minerals, the mass fraction of minerals according to the Parr formula is:
1.08XA d+0.55×St,d … … (1)
Wherein: a d -dry ash, mass fraction;
S t,d— dry basis total sulfur content, mass percent;
The mineral volume content MM is corrected for ash and sulfur content as shown in formula (2):
Calculating the individual coal inert component content TI according to formula (3):
Ti=i+mm … … (3)
3) Performing a Gibbs maximum fluidity test to obtain a Gibbs maximum fluidity lgMF of single coal;
4) Performing coke quality tests, including a coke crushing strength test, a coke abrasion resistance test, a coke thermal reactivity test and a coke post-reaction strength test; obtaining the coke crushing strength M 40, the coke abrasion resistance M 10, the coke thermal reactivity CRI and the coke strength CSR of single coal after reaction;
5) Normalizing the data; reflectivity to mirror body The inert component content TI and the Gibbs maximum fluidity lgMF are normalized, and the normalization equation is as follows:
Wherein: r i -properties normalized for the i-th single coal; r i -properties of the i-th single coal; r max -the maximum value of property r; r min -minimum of property r;
6) Drawing a coke quality control chart, including a coke crushing strength control chart, a coke wear resistance control chart, a coke thermal reactivity control chart and a coke post-reaction strength control chart; wherein:
Coke crushing strength control chart is based on specular reflectivity Establishing a contour map of coke crushing strength M 40 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
The coke wear-resistant strength control chart is based on the reflectivity of a mirror body Establishing a contour map of the coke wear resistance M 10 in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
coke thermal reactivity control is based on specular reflectance Establishing a contour map of coke thermal reactivity CRI in a triangular coordinate system by taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis;
Intensity control graph after coke reaction is obtained by using specular reflectivity Taking the inert component content TI as an X axis and the Gibbs maximum fluidity lgMF as a Z axis, and establishing a contour map of the intensity CSR after coke reaction in a triangular coordinate system.
3. The method for predicting coke quality by using coking coal specular reflectivity, inert component content and Gibbs maximum fluidity according to claim 2, wherein in the step 1), the specular reflectivity of a single coal, namely the average maximum specular reflectivity, is tested according to GB/T6948-2008 "microscopic method for measuring specular reflectivity of coal", the number of test points is not less than 100 points, and the average μ of the test data is calculated to be the specular reflectivity
4. The method for predicting coke quality by using the vitrinite reflectance, the content of inert components and the maximum fluidity of Gibbs of coking coals according to claim 2, wherein in the step 2), the contents of vitrinite V, inertinite I and chitin E in each single coal are tested according to GB/T8899-201 methods for determining microscopic components and minerals of coals.
5. The method for predicting coke quality by utilizing the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum Gibbs fluidity according to claim 2, wherein in the step 3), the maximum Gibbs fluidity lgMF of single coal is tested according to GB/T25213-2010 "plastic constant moment Gibbs method of coal".
6. The method for predicting coke quality by using the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum fluidity of gizzard according to claim 2, wherein in the step 4), the coke crushing strength test is performed by using a coke oven test, specifically comprising the following steps:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test crushing strength M 40 of coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by 40mm, and weighing;
Crushing strength of coke: m 40＝m1/m.times.100% … … (formula 5)
Wherein, m: charging drum coke mass, kg;
m 1: the mass of coke after the drum is discharged is more than 40mm, kg.
7. The method for predicting coke quality by using the reflectivity of coking coal lens bodies, the content of inert components and the maximum fluidity of Gibbs according to claim 2, wherein in the step 4), the coke abrasion resistance test is performed by using a coke oven experiment, specifically comprising the following steps:
Preparing single coal coke by using a 40kg coke oven; according to GB/T2006-2008 method for measuring mechanical strength of coke, micum drum is adopted to test the wear resistance M 10 of the coke; sieving coke by using a vibrating sieve, carrying out Micum drum test on the coke with the particle size larger than 60mm, standing for 1-2 min after 100 revolutions, sieving the obtained coke by using 10mm, and weighing;
Abrasion resistance of coke: m 10＝m2/m.times.100% … … (formula 6)
Wherein, m: charging drum coke mass, kg;
m 2: the mass of coke less than 10mm after the drum is discharged is kg.
8. The method for predicting coke quality using coking coal specular reflectivity, inert content and maximum gizzard fluidity according to claim 2, wherein in step 4), the coke thermal reactivity test is performed using a coke oven test, specifically as follows:
testing the thermal reactivity CRI of the coke according to GB/T4000-2008 method for testing reactivity and strength after reaction; get greater than Crushing and dividing the coke of 20kg by a jaw crusher to obtain 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, and reacts with carbon dioxide with the flow of 5L/min for 2 hours at the temperature of 1100+/-5 ℃, and the coke reactivity CRI is expressed as the percentage of the mass loss of the coke;
Cri= (m 3-m4)/mx100% … … (formula 7)
Wherein, m 3: coke mass before reaction, g;
m 4: residual coke mass g after reaction.
9. The method for predicting coke quality by using the reflectivity of coking coal microscopic bodies, the content of inert components and the maximum fluidity of gizzard according to claim 2, wherein in the step 4), the strength test after coke reaction is performed by using a coke oven experiment, specifically comprising the following steps:
Testing the post-reaction strength CSR of the coke according to GB/T4000-2008 method for testing reactivity and post-reaction strength of Coke; get greater than 20Kg of coke, crushing and dividing the coke by a jaw crusher, and dividing the coke into 10kg; by usingRound hole sieve screening, for more thanCrushing and sieving the coke blocks; is made intoIs a coke block of (2);
Weighing and weighing 200+/-0.5 G of coke is placed in a high-temperature resistant alloy steel reactor or a corundum reactor, reacts with carbon dioxide with the flow of 5L/min for 2 hours at 1100+/-5 ℃, and after I-type rotary drum test, the strength CSR of the coke after reaction is expressed by the mass fraction of the coke with the particle size of more than 10mm accounting for the coke after reaction;
Csr= (m 5-m6)/mx100% … … (formula 8)
Wherein, m 5: residual coke mass g after reaction;
m 6: and g, the mass of the granular coke after the drum is larger than 10mm.
10. The method for predicting coke quality using coking coal specular reflectivity, inert component content and gizzard maximum fluidity according to claim 2, wherein in the step 6), the data analysis method used includes polynomial regression, inverse distance weighted interpolation, kriging, minimum curvature, improved Xie Biede, natural neighbor, nearest neighbor, radial basis function, linear interpolation triangulated, moving average and local polynomials.
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