CN112945665B - Evaluation method for coking contribution performance of asphalt to coal blending - Google Patents
Evaluation method for coking contribution performance of asphalt to coal blending Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 56
- 238000004939 coking Methods 0.000 title claims abstract description 53
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000002156 mixing Methods 0.000 title claims abstract description 27
- 238000011156 evaluation Methods 0.000 title claims abstract description 8
- 239000000571 coke Substances 0.000 claims abstract description 59
- 239000000523 sample Substances 0.000 claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000013068 control sample Substances 0.000 claims abstract description 12
- 230000006872 improvement Effects 0.000 claims abstract description 12
- 238000010000 carbonizing Methods 0.000 claims abstract description 4
- 238000003763 carbonization Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000197 pyrolysis Methods 0.000 claims description 6
- 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
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 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
- 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
- 238000005516 engineering process Methods 0.000 description 4
- 230000008520 organization Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000011295 pitch Substances 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
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 238000000605 extraction Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 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
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011301 petroleum pitch Substances 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
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
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- 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
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- 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 the coking contribution performance of asphalt to coal blending prepares an asphalt test sample; preparing a reference test sample; carbonizing to obtain a measured sample coke and a control sample coke; calculating an OTI value; calculating an evaluation result of the quality improvement degree of the asphalt on the coke:wherein: s is the coke improvement degree,%; OTI (optical transport interface) 1 To determine the optical tissue index,%; OTI (optical transport interface) 0 Optical texture index,% (of the control coke). Compared with the prior art, the invention has the beneficial effects that: 1) The invention can intuitively judge the improvement effect of the coke quality of different asphalts in the coal blending coking; 2) The method is simple, 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 an evaluation method of coking contribution performance of asphalt to coal blending.
Background
Coal tar pitch, petroleum pitch and natural pitch. Wherein, coal tar pitch is a byproduct of coking; petroleum asphalt is residue after crude oil distillation; natural asphalt is stored underground, and some are formed into mineral deposits or accumulated on the surface of the crust. The present invention relates only to coal tar pitch. Coal tar pitch is a residue obtained after distillation and extraction of fractions from coal tar, and is mainly classified into low-temperature coal tar pitch, high-temperature coal tar pitch, reformed pitch, and the like according to different processing technologies and pitch production technologies.
At present, with the rapid development of iron-making technology, blast furnaces are moving to large-scale, and new and higher requirements are put on the quality of coke. As the furnace volume of blast furnaces increases, the crushing strength and the post-reaction strength of coke are required to be higher and lower, and the wear resistance and the reactivity are required to be lower. The production enterprises use various methods and technologies to meet the demands of users for improving the demands, and the current method for improving the coke quality mainly improves the occupation ratio of main coking coal in coking coal. Although China is a large country of coal resources, coking coal resources are not abundant, and high-quality main coking coal resources are more limited. Therefore, the mode faces the irrevocability and cannot meet the development requirement of the ferrous metallurgy industry in China in the future.
The role of asphalt in coal blending and coking has been confirmed, and adding a certain amount of asphalt into coking coal can improve the bonding performance of the coal blending, and is beneficial to improving the quality of metallurgical coke, including mechanical strength, reactivity, strength after reaction and the like.
Asphalt is used as a byproduct in coking chemical industry, coking enterprises have advantages on sources of raw materials, asphalt meeting the required quality can be obtained through selection and control of production processes, and the asphalt with different processes and qualities plays different roles in the coal blending coking process. At present, indexes such as a coking value, a softening point, quinoline insoluble matters, toluene insoluble matters and the like are generally adopted to evaluate the quality of asphalt, and the detection methods or means cannot distinguish the effect of asphalt in coal blending coking, and particularly, the influence on the quality of coke is still different when the indexes are similar. Therefore, a method is needed for evaluating the contribution of asphalt to the quality of metallurgical coke, better guiding the application of asphalt in coal blending and coking, and meeting the requirements of continuously improving the quality of metallurgical coke in the future.
Disclosure of Invention
The invention provides a method for evaluating the contribution performance of asphalt to coal blending coking, which can evaluate the effect of different asphalt in coal blending coking and improve the mechanical strength, reactivity and post-reaction strength of coke.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for evaluating the coking contribution performance of asphalt to coal blending comprises the following steps:
1) Preparing an asphalt test sample;
2) Preparing a reference test sample;
3) Carbonizing:
a) Weighing 5-500 g of reference test sample, adding asphalt test sample accounting for 1-10% of the total mass, fully mixing uniformly and placing in a quartz dry distillation tube;
b) Weighing 5-500 g of reference test sample, and placing the reference test sample into a quartz dry distillation tube to serve as a control sample;
c) And c) respectively carrying out carbonization on the samples obtained in the step a) and the step b) by using a tubular carbonization furnace, preheating the carbonization furnace, and then loading the sample into the carbonization furnace, wherein a heating system is as follows:
preheating at a temperature of 900+/-15 ℃ and a heating speed of 5+/-1 ℃/min;
900 ℃ +/-15 ℃ -950+/-15 ℃ and heating speed of 1+/-0.5 ℃/min;
keeping the temperature at 950+/-15 ℃ for 30+/-5 min;
d) Naturally cooling after carbonization to obtain a measurement sample coke and a control sample coke;
4) And (3) detection:
detecting the optical tissue content of the measured sample coke and the control sample coke according to the YB/T077-2017 coke optical tissue measuring method, and calculating an OTI value;
5) Calculating an evaluation result of the quality improvement degree of the asphalt on the coke:
wherein: s is the coke improvement degree,%;
OTI 1 to determine the optical tissue index,%;
OTI 0 optical texture index,% (of the control coke).
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 smaller than 0.2 mm; the specific method for preparing the reference test sample in the step 2) is as follows: and collecting a coking coal sample according to the national standard, and preparing a detection sample smaller than 0.2 mm.
The preheating temperature of the carbonization furnace is 250-350 ℃.
The working principle of the invention is as follows:
the optical organization index OTI of the coke is used for characterizing the anisotropy degree of the optical organization of the coke, and the higher the anisotropy degree of the optical organization of the coke is, the larger the OTI index of the coke is. The degree of anisotropy of the optical structure of the coke is inversely related to the coke reactivity, that is, the greater the OTI value of the coke, the lower the coke reactivity. Thus, the greater the OTI value of the coke after carbonization of the same coking coal, the better the reactivity and strength after reaction.
The coal tar pitch mainly comprises aromatic compounds, has good coking property and wettability to coal, can be used as a binder for blending coal and coking, can enhance the swelling of the coal, improve the fluidity of the coal, and improve the expansion degree and coking capacity of coking coal. Research at home and abroad shows that in the coal blending coking process, interaction between coal tar pitch and coal particles enhances reactivity of microscopic bodies, semi-wire carbon and microsomes incapable of forming plastic states in low-metamorphic-degree coal, promotes formation of mosaic structures and produces coke structures with more anisotropic structures.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention can intuitively judge the improvement effect of the coke quality of different asphalts in the coal blending coking;
2) The method is simple, convenient to operate, short in detection period and high in popularization value.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
A method for evaluating the coking contribution performance of asphalt to coal blending comprises the following steps:
1) Asphalt test specimens were prepared.
2) A reference test sample was prepared.
3) Carbonizing:
a) Weighing 5-500 g of reference test sample, adding asphalt test sample accounting for 1-10% of the total mass, fully mixing uniformly and placing in a quartz dry distillation tube;
b) Weighing 5-500 g of reference test sample, and placing the reference test sample into a quartz dry distillation tube to serve as a control sample;
c) And c) respectively carrying out carbonization on the samples obtained in the step a) and the step b) by using a tubular carbonization furnace, preheating the carbonization furnace, and then loading the sample into the carbonization furnace, wherein a heating system is as follows:
preheating at a temperature of 900+/-15 ℃ and a heating speed of 5+/-1 ℃/min;
900 ℃ +/-15 ℃ -950+/-15 ℃ and heating speed of 1+/-0.5 ℃/min;
keeping the temperature at 950+/-15 ℃ for 30+/-5 min.
d) And naturally cooling after carbonization to obtain the coke of the measurement sample and the coke of the control sample.
4) And (3) detection:
detecting the optical tissue content of the measured sample coke and the control sample coke according to the YB/T077-2017 coke optical tissue measuring method, and calculating an OTI value;
OTI＝∑f i (OTI) i
wherein: f (f) i Content,%;
(OTI) i assignment of values to the respective optical organizations.
5) Calculating an evaluation result of the quality improvement degree of the asphalt on the coke:
wherein: s is the coke improvement degree,%;
OTI 1 to determine the optical tissue index,%;
OTI 0 optical texture index,% (of the control coke).
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 smaller than 0.2 mm; the specific method for preparing the reference test sample in the step 2) is as follows: and collecting a coking coal sample according to the national standard, and preparing a detection sample smaller than 0.2 mm.
The preheating temperature of the carbonization furnace is 250-350 ℃.
Example 1:
two kinds of asphalt used in production are detected, and indexes are shown in table 1:
table 1 example 1 detection of bitumen index
| Name of the name | Toluene insoluble matter/% | Quinoline insoluble/% | Softening point/. Degree.C | Coking value/% |
| Asphalt A | 19.78 | 10.30 | 87 | 52.60 |
| Asphalt B | 27.86 | 11.13 | 117 | 56.52 |
Coking coal for production is detected, and indexes are shown in table 2:
table 2 example 1 detection of coking coal index for production
| Name of the name | A d /％ | V daf /％ | G | Y/mm |
| Coking coal | 9.50 | 25.77 | 76 | 15.5 |
Charring the coking coal-asphalt A test sample, the coking coal-asphalt B test sample and the coking coal control sample respectively, measuring the optical structure content of charred coke, and measuring the OTI value, wherein the results are shown in Table 3.
TABLE 3 example 1 determination of OTI values for samples
S A ＝2.91％
S B ＝4.34％。
The improvement degree of the coke quality of asphalt B is better than that of asphalt A.
The coke obtained by blending coal and coking with asphalt B proved to be better than that obtained by blending coal and coking with asphalt A by the generation verification, and the results are shown in Table 4.
Table 4 example 1 coal sample blending coking Coke index
| Name of the name | M 40 /％ | M 10 /％ | 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 production are detected, and indexes are shown in table 5:
table 5 example 2 detection of bitumen index
| Name of the name | Toluene insoluble matter/% | Quinoline insoluble/% | 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 coking coal for production is detected, and the indexes are shown in Table 6:
table 6 example 2 detection of coking coal index for production
| Name of the name | A d /％ | V daf /％ | G | Y/mm |
| Coking coal | 9.12 | 28.66 | 74 | 13.0 |
Charring the coking coal-asphalt A test sample, the coking coal-asphalt B test sample and the coking coal control sample respectively, measuring the optical structure content of charred coke, and measuring the OTI value, wherein the results are shown in Table 7.
TABLE 7 example 2 determination of OTI values for samples
S A ＝2.91％
S B ＝5.52％
The improvement degree of the coke quality of asphalt B is better than that of asphalt A.
The results of the generation verification show that the coke obtained by blending coal and coking with asphalt B is better than the coke obtained by blending coal and coking with asphalt A, and the results are shown in Table 8.
Table 8 example 2 coal sample blending coking Coke index
| Name of the name | M 40 /％ | M 10 /％ | 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 (1)
1. The evaluation method of the coking contribution performance of asphalt to coal blending is characterized by comprising the following steps:
1) Preparation of bitumen test samples: collecting a plurality of asphalt samples to be evaluated, and preparing detection samples smaller than 0.2 mm;
2) Preparing a reference test sample: the specific method for preparing the reference test sample in the step 2) is as follows: collecting a coking coal sample, and preparing a detection sample smaller than 0.2 mm;
3) Carbonizing:
a) Weighing 5-500 g of reference test sample, adding asphalt test sample accounting for 1-10% of the total mass, fully mixing uniformly and placing in a quartz dry distillation tube;
b) Weighing 5-500 g of reference test sample, and placing the reference test sample into a quartz dry distillation tube to serve as a control sample;
c) And c) respectively carrying out carbonization on the samples obtained in the step a) and the step b) by using a tubular carbonization furnace, preheating the carbonization furnace, and then loading the sample into the carbonization furnace, wherein a heating system is as follows:
preheating at a temperature of 900+/-15 ℃ and a heating speed of 5+/-1 ℃/min;
900 ℃ +/-15 ℃ -950+/-15 ℃ and heating speed of 1+/-0.5 ℃/min;
keeping the temperature at 950+/-15 ℃ for 30+/-5 min;
d) Naturally cooling after carbonization to obtain a measurement sample coke and a control sample coke;
4) And (3) detection:
detecting the optical tissue content of the measured sample coke and the control sample coke according to the YB/T077-2017 coke optical tissue measuring method, and calculating an OTI value;
5) Calculating an evaluation result of the quality improvement degree of the asphalt on the coke:
wherein: s is the coke improvement degree,%;
OTI 1 to determine the optical tissue index,%;
OTI 0 optical structure index,%;
the preheating temperature of the carbonization furnace is 250-350 ℃.
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