CN112945665A - Method for evaluating contribution performance of asphalt to coal blending coking - Google Patents
Method for evaluating contribution performance of asphalt to coal blending coking Download PDFInfo
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- CN112945665A CN112945665A CN202110125250.8A CN202110125250A CN112945665A CN 112945665 A CN112945665 A CN 112945665A CN 202110125250 A CN202110125250 A CN 202110125250A CN 112945665 A CN112945665 A CN 112945665A
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- 238000004939 coking Methods 0.000 title claims abstract description 53
- 239000003245 coal Substances 0.000 title claims abstract description 50
- 239000010426 asphalt Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002156 mixing Methods 0.000 title claims abstract description 26
- 239000000571 coke Substances 0.000 claims abstract description 60
- 239000000523 sample Substances 0.000 claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 239000013074 reference sample Substances 0.000 claims abstract description 12
- 230000006872 improvement Effects 0.000 claims abstract description 10
- 238000010000 carbonizing Methods 0.000 claims abstract description 4
- 238000011156 evaluation Methods 0.000 claims abstract description 4
- 238000000197 pyrolysis Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000011294 coal tar pitch Substances 0.000 description 8
- 239000011295 pitch Substances 0.000 description 8
- 230000009257 reactivity Effects 0.000 description 7
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011301 petroleum pitch Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 210000001589 microsome Anatomy 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011306 natural pitch Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004079 vitrinite Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Coke Industry (AREA)
Abstract
A method for evaluating contribution performance of asphalt to coal blending coking comprises preparing an asphalt test sample; preparing a reference test sample; carbonizing to obtain coke of a test sample and coke of a reference sample; calculating an OTI value; and (3) calculating the evaluation result of the asphalt on the coke quality improvement degree:
in the formula: s is the coke improvement degree,%; OTI1In order to determine the optical texture index,%; OTI0Optical structure index,%, of coke as a control. Compared with the prior art, the invention has the beneficial effects that: 1) the method can intuitively judge the improvement effect of different asphalts on coke quality in coal blending and coking; 2) the method is simple, simple and convenient to operate, short in detection period and high in popularization value.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a method for evaluating contribution performance of asphalt to coal blending coking.
Background
Coal tar pitch, petroleum pitch and natural pitch. Wherein, the coal tar pitch is a byproduct of coking; petroleum pitch is the residue of crude oil distillation; natural bitumen is stored underground, and some forms a mineral layer or is accumulated on the surface of the crust. The present invention relates only to coal tar pitch. Coal tar pitch is the residue of coal tar after distillation and distillation, and is mainly classified into low-temperature coal tar pitch, high-temperature coal tar pitch, reformed pitch and the like according to different processing processes and pitch production processes.
At present, with the rapid development of iron-making technology, blast furnaces are becoming large-scale, and new and higher requirements for coke quality are put forward. With the increase of the furnace volume of the blast furnace, the crushing strength and the strength after reaction of the coke are required to be higher and lower, and the abrasion resistance and the reactivity are required to be lower and lower. In order to meet the requirements of production enterprises, various methods and technologies are used for improving the adaptation requirements, and the current method for improving the coke quality mainly aims at improving the ratio of main coking coal in coking coal. Although China is a big coal resource country, coking coal resources are not abundant, and high-quality main coking coal resources are more limited. Therefore, the method is unsustainable and cannot meet the development requirements of the ferrous metallurgy industry in China in the future.
The function of the asphalt in coal blending and coking is proved, and the addition of a certain amount of asphalt into coking coal can improve the caking property of the blended coal and is beneficial to improving the quality of metallurgical coke, including mechanical strength, reactivity, strength after reaction and the like.
The asphalt is used as a byproduct in coking chemical industry, coking enterprises have advantages on the source of raw materials, the asphalt meeting the required quality can be obtained through the selection and control of production processes, and the functions of the asphalt in different processes and qualities in the coal blending and coking process are different. At present, indexes such as coking value, softening point, quinoline insoluble substances, toluene insoluble substances and the like are generally adopted to evaluate the quality of the asphalt, the detection methods or means cannot distinguish the function of the asphalt in coal blending coking, and particularly, when the indexes are similar, the influence on the quality of the coke is still different. Therefore, a method is needed for evaluating the contribution of the asphalt to the quality of metallurgical coke, better guiding the application of the asphalt in coal blending and coking and meeting the continuously improved quality requirement of the metallurgical coke in the future.
Disclosure of Invention
The invention provides a method for evaluating contribution performance of asphalt to coal blending coking, which can evaluate the advantages and disadvantages of different asphalts in coal blending coking and improve the mechanical strength, reactivity and post-reaction strength of coke.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating contribution performance of asphalt to coal blending coking comprises the following steps:
1) preparing an asphalt test sample;
2) preparing a reference test sample;
3) carbonizing:
a) weighing 5-500 g of a reference test sample, adding an asphalt test sample accounting for 1-10% of the total mass, fully and uniformly mixing, and placing in a quartz dry distillation tube;
b) weighing 5-500 g of a reference test sample, and placing the reference test sample in a quartz dry distillation tube to serve as a reference sample;
c) respectively carrying out dry distillation on the samples obtained in the step a) and the step b) by using a tubular retort, preheating the retort, and then loading the samples into the retort, wherein the heating system is as follows:
preheating temperature is 900 +/-15 ℃, and heating speed is 5 +/-1 ℃/min;
the temperature is 900 +/-15-950 +/-15 ℃, and the heating speed is 1 +/-0.5 ℃/min;
keeping the temperature at 950 +/-15 ℃ for 30 +/-5 min;
d) naturally cooling after dry distillation to obtain a test sample coke and a reference sample coke;
4) and (3) detection:
detecting the optical tissue contents of a determined sample coke and a reference sample coke according to a method for determining the optical tissue of the YB/T077-2017 coke, and calculating an OTI value;
5) and (3) calculating the evaluation result of the asphalt on the coke quality improvement degree:
in the formula: s is the coke improvement degree,%;
OTI1in order to determine the optical texture index,%;
OTI0optical structure index,%, of coke as a control.
The specific method for preparing the asphalt test sample in the step 1) comprises the following steps: collecting a plurality of asphalt samples to be evaluated, and preparing detection samples with the thickness less than 0.2 mm; the specific method for preparing the reference test sample in the step 2) comprises the following steps: and collecting a coking coal sample according to the national standard to prepare a detection sample with the particle size of less than 0.2 mm.
The preheating temperature of the retort is 250-350 ℃.
The working principle of the invention is as follows:
the optical tissue index OTI of the coke is used for representing the degree of anisotropy of the optical tissue of the coke, and the higher the degree of anisotropy of the optical tissue of the coke is, the larger the OTI index is. The degree of anisotropy of the optical structure of the coke is inversely related to the reactivity of the coke, i.e., the higher the OTI value of the coke, the lower the reactivity of the coke. Therefore, the higher the OTI value of the coke after dry distillation of the same coking coal, the better the reactivity and the strength after the reaction.
The coal tar pitch mainly comprises aromatic compounds, has good coking property and wettability to coal, can be used as a binder for coal blending and coking to enhance the swelling of the coal, improve the fluidity of the coal and improve the swelling degree and coking capacity of coking coal. Domestic and foreign researches show that in the coal blending and coking process, coal tar pitch and coal particles interact, so that the reactivity of vitrinite, semi-filament carbon and plastic-state-incapable microsome in low-metamorphic coal is enhanced, the formation of an embedded structure is promoted, and a coke tissue with more anisotropic structures is produced.
Compared with the prior art, the invention has the beneficial effects that:
1) the method can intuitively judge the improvement effect of different asphalts on coke quality in coal blending and coking;
2) the method is simple, simple and convenient to operate, short in detection period and high in popularization value.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for evaluating contribution performance of asphalt to coal blending coking comprises the following steps:
1) asphalt test samples were prepared.
2) A benchmark test sample was prepared.
3) Carbonizing:
a) weighing 5-500 g of a reference test sample, adding an asphalt test sample accounting for 1-10% of the total mass, fully and uniformly mixing, and placing in a quartz dry distillation tube;
b) weighing 5-500 g of a reference test sample, and placing the reference test sample in a quartz dry distillation tube to serve as a reference sample;
c) respectively carrying out dry distillation on the samples obtained in the step a) and the step b) by using a tubular retort, preheating the retort, and then loading the samples into the retort, wherein the heating system is as follows:
preheating temperature is 900 +/-15 ℃, and heating speed is 5 +/-1 ℃/min;
the temperature is 900 +/-15-950 +/-15 ℃, and the heating speed is 1 +/-0.5 ℃/min;
keeping the temperature at 950 +/-15 ℃ for 30 +/-5 min.
d) And naturally cooling after dry distillation to obtain the coke of the measured sample and the coke of the reference sample.
4) And (3) detection:
detecting the optical tissue contents of a determined sample coke and a reference sample coke according to a method for determining the optical tissue of the YB/T077-2017 coke, and calculating an OTI value;
OTI＝∑fi(OTI)i
in the formula: f. ofiContent of each optical tissue,%;
(OTI)ithe value assigned to each optical organization.
5) And (3) calculating the evaluation result of the asphalt on the coke quality improvement degree:
in the formula: s is the coke improvement degree,%;
OTI1in order to determine the optical texture index,%;
OTI0optical structure index,%, of coke as a control.
The specific method for preparing the asphalt test sample in the step 1) comprises the following steps: collecting a plurality of asphalt samples to be evaluated, and preparing detection samples with the thickness less than 0.2 mm; the specific method for preparing the reference test sample in the step 2) comprises the following steps: and collecting a coking coal sample according to the national standard to prepare a detection sample with the particle size of less than 0.2 mm.
The preheating temperature of the retort is 250-350 ℃.
Example 1:
two kinds of asphalt used in the detection production have indexes shown in table 1:
table 1 example 1 asphalt index test
| Name (R) | Insoluble matter of toluene/%) | Quinoline insoluble fraction | Softening point/. degree.C | Coking value/% |
| Asphalt A | 19.78 | 10.30 | 87 | 52.60 |
| Asphalt B | 27.86 | 11.13 | 117 | 56.52 |
The indexes of the coking coal for detection and production are shown in the table 2:
TABLE 2 EXAMPLE 1 detection of coking coal indexes for production
| Name (R) | Ad/％ | Vdaf/％ | G | Y/mm |
| Coking coal | 9.50 | 25.77 | 76 | 15.5 |
The coking coal-asphalt A test sample, the coking coal-asphalt B test sample and the coking coal reference sample are respectively carbonized, the optical structure content of the carbonized coke is measured, and the OTI value is measured, and the results are shown in Table 3.
TABLE 3 determination of OTI values for the samples of example 1
SA＝2.91％
SB＝4.34％。
Pitch B proved to improve coke quality better than pitch a.
The formation verification proves that the coke obtained by coal blending and coking with the pitch B is better than the coke obtained by the pitch A, and the results are shown in the table 4.
TABLE 4 coke index obtained by blending coal and coking coal sample in example 1
| Name (R) | M40/％ | M10/％ | CRI/％ | CSR/％ |
| Coke control | 87.3 | 7.1 | 24.3 | 65.2 |
| Coke A | 87.5 | 6.9 | 22.5 | 67.3 |
| Coke B | 87.4 | 6.5 | 21.3 | 68.1 |
Example 2:
two kinds of asphalt used in the detection production have indexes shown in a table 5:
table 5 example 2 asphalt index test
| Name (R) | Insoluble matter of toluene/%) | Quinoline insoluble fraction | Softening point/. degree.C | Coking value/% |
| Asphalt A | 27.86 | 11.13 | 117 | 56.52 |
| Asphalt B | 29.50 | 12.27 | 110 | 57.70 |
The indexes of the coking coal for detection and production are shown in the table 6:
TABLE 6 example 2 detection of coking coal indexes for production
| Name (R) | Ad/％ | Vdaf/％ | G | Y/mm |
| Coking coal | 9.12 | 28.66 | 74 | 13.0 |
The coking coal-asphalt A test sample, the coking coal-asphalt B test sample and the coking coal reference sample are respectively carbonized, the optical structure content of the carbonized coke is measured, and the OTI value is measured, and the results are shown in Table 7.
TABLE 7 determination of OTI values for the samples of example 2
SA＝2.91％
SB＝5.52％
Pitch B proved to improve coke quality better than pitch a.
The formation verification proves that the coke obtained by coal blending and coking with the pitch B is better than the coke obtained by the pitch A, and the results are shown in Table 8.
TABLE 8 coke index obtained by blending coal and coking for example 2 coal sample
| Name (R) | M40/％ | M10/％ | CRI/％ | CSR/％ |
| Coke control | 85.6 | 7.9 | 26.2 | 60.1 |
| Coke A | 87.2 | 7.5 | 25.4 | 61.8 |
| Coke B | 86.9 | 7.4 | 24.6 | 62.6 |
。
Claims (3)
1. The method for evaluating the contribution performance of the asphalt to coal blending coking is characterized by comprising the following steps of:
1) preparing an asphalt test sample;
2) preparing a reference test sample;
3) carbonizing:
a) weighing 5-500 g of a reference test sample, adding an asphalt test sample accounting for 1-10% of the total mass, fully and uniformly mixing, and placing in a quartz dry distillation tube;
b) weighing 5-500 g of a reference test sample, and placing the reference test sample in a quartz dry distillation tube to serve as a reference sample;
c) respectively carrying out dry distillation on the samples obtained in the step a) and the step b) by using a tubular retort, preheating the retort, and then loading the samples into the retort, wherein the heating system is as follows:
preheating temperature is 900 +/-15 ℃, and heating speed is 5 +/-1 ℃/min;
the temperature is 900 +/-15-950 +/-15 ℃, and the heating speed is 1 +/-0.5 ℃/min;
keeping the temperature at 950 +/-15 ℃ for 30 +/-5 min;
d) naturally cooling after dry distillation to obtain a test sample coke and a reference sample coke;
4) and (3) detection:
detecting the optical tissue contents of a determined sample coke and a reference sample coke according to a method for determining the optical tissue of the YB/T077-2017 coke, and calculating an OTI value;
5) and (3) calculating the evaluation result of the asphalt on the coke quality improvement degree:
in the formula: s is the coke improvement degree,%;
OTI1in order to determine the optical texture index,%;
OTI0optical structure index,%, of coke as a control.
2. The method for evaluating the contribution performance of the asphalt to coal blending coking according to claim 1, wherein the specific method for preparing the asphalt test sample in the step 1) is as follows: collecting a plurality of asphalt samples to be evaluated, and preparing detection samples with the thickness less than 0.2 mm; the specific method for preparing the reference test sample in the step 2) comprises the following steps: and (4) collecting a coking coal sample, and preparing a detection sample with the particle size of less than 0.2 mm.
3. The method for evaluating the contribution performance of the asphalt to coal blending and coking as claimed in claim 1, wherein the pre-heating temperature of the retort is 250-350 ℃.
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| CN202110125250.8A CN112945665B (en) | 2021-01-29 | 2021-01-29 | Evaluation method for coking contribution performance of asphalt to coal blending |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608864A (en) * | 2022-03-07 | 2022-06-10 | 中国矿业大学(北京) | Tectonic coal directional sample sampling device, sampling method and testing method |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608864A (en) * | 2022-03-07 | 2022-06-10 | 中国矿业大学(北京) | Tectonic coal directional sample sampling device, sampling method and testing method |
| CN114608864B (en) * | 2022-03-07 | 2023-03-10 | 中国矿业大学(北京) | Tectonic coal directional sample sampling device, sampling method and testing method |
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