CN101726509B - Method for determining high-temperature expansion property of coke - Google Patents
Method for determining high-temperature expansion property of coke Download PDFInfo
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- CN101726509B CN101726509B CN200810201581XA CN200810201581A CN101726509B CN 101726509 B CN101726509 B CN 101726509B CN 200810201581X A CN200810201581X A CN 200810201581XA CN 200810201581 A CN200810201581 A CN 200810201581A CN 101726509 B CN101726509 B CN 101726509B
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Abstract
The invention provides a method for determining high-temperature expansion property of coke. The method is characterized by comprising the steps of: (1) preparing a sample, namely cutting the coke by a water cutting machine, sampling, grinding the sample, cleaning, and drying; and (2) determining the sample, namely placing the sample obtained in the step (1) into a high-temperature thermal dilatometer for determination. The determination method has short time and high precision, and can perform accurate quantitative analysis on the thermal expansion property of the coke.
Description
Technical field
The present invention relates to coke mechanical property field, specifically, the present invention relates to a kind of assay method of coke hot expansibility.
Background technology
The expansion character of object is represented with expansion coefficient.Expansion coefficient is the physical quantity of length when characterizing object and being heated, area, volume change degree, and it is the general name of linear expansion coefficient, superficial expansivity and coefficient of volumetric expansion.Say that from microcosmic what expansion character reflected is the variable quantity that the atomic vibration energy raises with temperature; Say that from macroscopic view expansion character is the basis of calculating thermal stress, influenced by structural factors such as object density, porosity, pass.
Coke by coal through coking and obtaining, because in the particularly continuous reduction of coke ratio in the blast furnace of metallurgy industry, therefore, the thermal stress that research causes because of coke high temperature expands concentrates the elevated temperature strength that whether can influence coke that crucial meaning is arranged.
Coke conventional high-temperature intensity index CSR and CRI estimate the good and bad important indicator of coke quality, and at home and abroad usable range is very wide, and is accepted by vast coking worker and blast-furnace man author.But it is big that the greatest drawback of these two indexs is measuring error, and the CSR permissible error is 3.2%, and the CRI permissible error is 2.6%, is that artificial sampling sample preparation and testing equipment fall behind and cause the big basic reason of its error.
The method of existing mensuration coke expansion coefficient mainly contains two kinds.A kind of method is that pitch and coke are mixed and made into carbon rod or graphite rod, with the expansion coefficient through the expansion coefficient coke for replacing of carbon rod behind the high temperature or graphite rod.This method can not really reflect the expansion character of coke.Another kind method is to adopt traditional method for making sample; Machine cuts is combined sample preparation with manual mill sample is measured again, still, the mensuration of expansion coefficient has higher requirement to the size of sample; This method exists that precision is low, consuming time, shortcomings such as sample is prone to crack in the sample making course; And sample will experience long post bake in machine cuts and hand mill process, and the generation of new crackle or post bake all can produce bigger influence to the expansion coefficient of sample, therefore; Because there is defective in the method for making sample of coke, causes people can't measure the expansion character of coke accurately.
Therefore, be the deficiency of sample preparation and analytical approach in the mensuration that solves existing coke expansion character, the object of the present invention is to provide the assay method of the high-temperature expansion property of coke that a kind of time is short, precision is high.
Summary of the invention
The present invention provides a kind of assay method of high-temperature expansion property of coke, it is characterized in that, may further comprise the steps:
(1) preparation of sample: water cutter cutting coke, sampling, grind away, cleaning, oven dry;
(2) mensuration of sample: step (1) gained sample is put into the elevated temperature heat dilatometer measure;
Preferably, in the operation of said water cutter cutting coke, the water cutter cuts into 20-40mm length with coke.
Preferably, in the said sampling operation, drilling through coke sample apart from a burnt 25-45mm place with the ST that has emery with ST, the ST diameter is 5-15mm.
Preferably, in the operation of said grind away, make sample two circular end surface parallel and make sample length reach 8-20mm with sample grinding machine.
Preferably, in the said cleaning operation, said sample is repeatedly cleaned with ultrasonic cleaner.
Preferably, in the said drying operation, sample was dried 4 hours at 130 ℃.
Preferably, in the said step (2), the said temperature section that is determined at room temperature to 1300 ℃ carries out; More preferably, in said temperature section, heating rate is 50 ℃/min during normal temperature-400 ℃; Heating rate is 3 ℃/min in the time of 400-1000 ℃, and heating rate is 1 ℃/min when surpassing 1000 ℃.
Preferably, in the said step (2), the said N that is determined at
2Carry out under the gas shiled.
In said step (1), water cutter cutting coke has been avoided the thermal effect in the sampling process well; The direction of its external force is consistent with the sampling direction during sampling, has avoided the damage of external force to sample; Can make gained coke size be accurate to 0.01mm during grind away; Can well remove sampling with ultrasonic cleaning in the cleaning operation and the time be deposited on the powdered carbon particle on the coke, avoid the pollution of later stage equipment; Oven dry can well be removed the free water in the coke, the error of avoiding the later stage free water that test is produced.
According to the method for the invention, in survey coke sample, Δ L/L
0A peak value (as shown in Figure 1) can occur, definition temperature this moment is a peak temperature, definition Δ L/L this moment
0Be peak L
fAnalyze the coke thermal expansion coefficients according to the time, select peak temperature and peak L for use
f, these two parameters can well differentiate and give vent to anger, fertile, thin, burnt, accurately explain the hot expansibility of coke.
Beneficial effect of the present invention:
1, the size of the made sample of the inventive method is more accurate, and precision can reach 0.01mm, has avoided conventional method to post bake and destruction that sample produces simultaneously, can guarantee the characteristic that sample is original to greatest extent.Compare with classic method, the inventive method can shorten to the sample preparation time about 5 minutes by 1-2 hour, was fit to sample preparation in enormous quantities.
2, the present invention proposes a new coke r peak L f, and this parameter and coke conventional high-temperature intensity index CSR and CRI have good match relation, referring to Fig. 2 and Fig. 3.Peak L f can be used as the auxiliary characteristics of judging the coke elevated temperature strength.With respect to the 200g sample size of CSR and CRI, the mensuration of peak L f only needs about 6 coke that contain burnt head in addition, and specimen in use quantity significantly reduces.In addition, the thermal stress that accurately is measured as under the high temperature from now on of coke peak L f is concentrated the basis that quantitative Analysis is provided.
Description of drawings
Fig. 1 representes the coke expansion character;
Fig. 2 representes the relation between peak value and the reactivity;
Fig. 3 representes the relation between peak value and the post-reaction strength.
Embodiment
Below combine accompanying drawing that the present invention is made more detailed description with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1-9 specimen in use is as shown in table 1.The water cutter cuts to the 20-40mm left and right thickness with coke, and according to the difference of coke, the pressure and the speed of adjustment water cutter make that the cut channel on the cut surface is as far as possible little.The ST that contains emery with the 10mm diameter is drilling through apart from a burnt 25-45mm place, selects the few place of crackle when drilling through.Need constantly add water cooling in the drilling operation and prevent thermal effect.Speed to produce DIL402PC and carry the SGM402/15 sample grinding machine and make sample two circular end surface parallel and make sample length reach 8-20mm with Germany is anti-.Repeatedly clean with the ultrasonic cleaner STRENGTH ON COKE, use distilled water during cleaning, clean to and stop when the distilled water color no longer changes cleaning.Coke sample after cleaning is placed in the drying baker 130 ℃ of following oven dry about 4 hours.Dried coke sample is put into dilatometer, and logical nitrogen begins to measure.Measure and finish to obtain curve, on curve, explain out peak temperature, peak value like Fig. 1.Related physical expansion coefficient parameter under other temperature data output function that can carry with software is output as the TXT form with data if desired, can obtain desired data under arbitrary temperature.Embodiment gained peak L f and CRI, CSR are as shown in table 1.
Table 1
| Embodiment | The sample title | Peak L f | Reactive CRI | Post-reaction strength CSR |
| 1 | Q official's bridge | 6.41E-03 | 34.80 | 51.4 |
| 2 | The Q Shuangyashan | 4.64E-03 | 43.00 | 35.7 |
| 3 | Q Sun Liang | 6.80E-03 | 33.30 | 51.4 |
| 4 | The yellowish-white thatch of F | 7.17E-03 | 18.90 | 65.4 |
| 5 | F Qian Jiaying | 6.40E-03 | 27.40 | 53.0 |
| 6 | J Gujiao City | 6.87E-03 | 26.00 | 59.3 |
| 7 | J Hei Er | 7.08E-03 | 13.80 | 77.6 |
| 8 | J reveals excellent paddy | 7.10E-03 | 11.10 | 74.8 |
| 9 | In the J wood | 6.51E-03 | 30.50 | 57.4 |
Can find out peak L by table 1 and Fig. 2,3
fAnd between reactive CRI, the post-reaction strength CSR good correlativity is arranged.
Adopt method of the present invention; Can accurately also measure the high-temperature expansion property of coke easily; Therefore can improve degree of accuracy and the rationality that the coking coal coking behavior is estimated; Remedy coke CSR and the big deficiency of CRI measuring error, and lay a good foundation for the behavioral mechanism of further analysis interpretation coke in blast furnace.
Claims (8)
1. the assay method of high-temperature expansion property of coke is characterized in that, may further comprise the steps:
(1) preparation of sample: water cutter cutting coke, sampling, grind away, cleaning, oven dry;
(2) mensuration of sample: step (1) gained sample is put into the elevated temperature heat dilatometer measure; In the said sampling operation, drilling through the coke sample with the ST that has emery apart from a burnt 25-45mm place, the ST diameter is 5-15mm.
2. the method for claim 1 is characterized in that, in the operation of said water cutter cutting coke, the water cutter cuts into 20-40mm length with coke.
3. the method for claim 1 is characterized in that, in the operation of said grind away, uses sample grinding machine to make sample two circular end surface parallel and make sample length be 8-20mm.
4. the method for claim 1 is characterized in that, in the said cleaning operation, with ultrasonic cleaner said sample is repeatedly cleaned.
5. the method for claim 1 is characterized in that, in the said drying operation, sample is dried 4 hours at 130 ℃.
6. the method for claim 1 is characterized in that, in the said step (2), the said temperature section that is determined at room temperature to 1300 ℃ carries out.
7. method as claimed in claim 6 is characterized in that, in said temperature section, heating rate is 50 ℃/min during normal temperature-400 ℃, and heating rate is 3 ℃/min in the time of 400-1000 ℃, and heating rate is 1 ℃/min when surpassing 1000 ℃.
8. the method for claim 1 is characterized in that, in the said step (2), and the said N that is determined at
2Carry out under the gas shiled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201581XA CN101726509B (en) | 2008-10-23 | 2008-10-23 | Method for determining high-temperature expansion property of coke |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201581XA CN101726509B (en) | 2008-10-23 | 2008-10-23 | Method for determining high-temperature expansion property of coke |
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| Publication Number | Publication Date |
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| CN101726509A CN101726509A (en) | 2010-06-09 |
| CN101726509B true CN101726509B (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810201581XA Expired - Fee Related CN101726509B (en) | 2008-10-23 | 2008-10-23 | Method for determining high-temperature expansion property of coke |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5143689A (en) * | 1990-11-09 | 1992-09-01 | The Standard Oil Company | Method for determining the coefficient of thermal expansion of coke |
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2008
- 2008-10-23 CN CN200810201581XA patent/CN101726509B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5143689A (en) * | 1990-11-09 | 1992-09-01 | The Standard Oil Company | Method for determining the coefficient of thermal expansion of coke |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平5-288745A 1993.11.02 |
| 赵建国等.炭/炭复合材料热膨胀性能的研究.《材料热处理学报》.2006,第27卷(第6期),第1-4页. * |
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| CN101726509A (en) | 2010-06-09 |
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Granted publication date: 20120111 Termination date: 20161023 |