CN110964552A - Method for classifying main mixed coking coal for coking - Google Patents
Method for classifying main mixed coking coal for coking Download PDFInfo
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- CN110964552A CN110964552A CN201811154702.XA CN201811154702A CN110964552A CN 110964552 A CN110964552 A CN 110964552A CN 201811154702 A CN201811154702 A CN 201811154702A CN 110964552 A CN110964552 A CN 110964552A
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- 239000003245 coal Substances 0.000 title claims abstract description 174
- 238000004939 coking Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000000571 coke Substances 0.000 claims abstract description 96
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 8
- 238000000197 pyrolysis Methods 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 7
- 238000002310 reflectometry Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 239000004079 vitrinite Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0087—Resistance to crushing
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- Chemical & Material Sciences (AREA)
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a classification method of main mixed coking coal for coking, which is characterized in that coking coal is classified into main mixed coking coal I and main mixed coking coal II respectively according to different ranges of indexes of vitrinite reflectance distribution, coke cold crushing strength M40 and hot post-reaction strength CSR of the coking coal; the blending of the main mixed coking coal is determined, a simple and easy technical route is provided for coal blending and coking, the guiding effect of the product physical quality on coal classification is strengthened, the internal quality requirement of raw material coal is considered, the coking coal can be dynamically and objectively classified and managed, the one-to-one correspondence between the adjustment control of a single coke index M40 or CSR and the quality of the raw material coal is realized, the coke quality and cost control are relatively simple and easy, and the negative influence of the coke quality change on blast furnace production is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgical coking, and particularly relates to a method for classifying mixed main coking coal for coking.
Background
The coke has an important role in steel production, the requirement on the coke quality is higher and higher along with the upsizing of a blast furnace and the improvement of the coal injection level, the real level of the coke quality cannot be objectively reflected by indexes such as conventional ash content, sulfur content, M40, M10 and the like, and the post-reaction strength CSR and the crushing strength M40 of the coke are more and more emphasized. The existing classification method of coking coal takes indexes such as dry ash-free base volatile component Vdaf for representing the deterioration degree of coking coal, caking index G for representing the caking property of coking coal, maximum thickness Y of a gelatinous layer and the like as the classification method of coking coal, and is widely adopted by coking plants. However, this method has some drawbacks: the indexes of Vdaf, G value and Y value in use have additivity, the same index of coking coal can be from a single coal type or from mixed coal mixed by a plurality of different coal types, and the quality of the coking coal cannot be truly reflected, so that the quality of coke is difficult to accurately predict and control; the classification method only takes the caking property of the coking coal as a main part, and does not consider the coking property of the coking coal which is an important process performance index, so that the quality of the product material object of the coal with the same index is greatly different when the coal is independently coked; for enterprises with more main coking coals and more mining points, the phenomena of more classifications and more varieties exist, the coking performance of similar coals is obviously different due to different coal-forming factors of all coal systems, the coking coal indexes of all the mining points are similar, but the coke quality indexes obtained by coking are extremely inconsistent, and the coke quality is difficult to accurately predict and control in production organization. Therefore, the key point for solving the problems is to research a classification method of the mixed main coking coal for coking, which can meet the quality control requirements of enterprises on coking coal quality management and high-quality low-cost coke production.
Disclosure of Invention
The invention aims to provide a method for classifying mixed main coking coal for coking.
The object of the invention is achieved by the following steps:
A. taking main coking coal for coking, and detecting the maximum average reflectivity
And distribution;
B. then carrying out a coke oven coking test of 200kg on the main coke coal for focusing to obtain coke, and detecting the cold crushing strength M40 and the hot reaction post-strength CSR;
C. summarizing, classifying coal types according to the following table
D. 1/3 coking coal, mixed main coking coal I and mixed main coking coal II are respectively loaded into a coal blending groove, and mixed main coking coal II, which is fed into a coke oven carbonization chamber for coking after being blended by a variable frequency coal blending belt according to the dry coal amount of 1/3 coking coal 50-60%, mixed main coking coal I15-25% and mixed main coking coal II 15-30%.
Compared with the prior art, the invention has the following technical effects:
1. the method comprehensively considers the leading effect of coking performance of coking coal on classification methods, not only strengthens the guiding effect of product quality on coal classification, but also considers the inherent quality requirement of raw material coal, and can perform dynamic and objective classification management on the coking coal;
2. the regulation and control are convenient, the ratio of the main mixed coking coal I is increased, the CSR index of the coke can be improved, and vice versa; the ratio of the main coking coal II can be increased, so that the index M40 of the coke can be improved, and vice versa;
3. the one-to-one correspondence between the adjustment control of the single coke index M40 or CSR and the quality of the raw material coal is realized, the coke quality and the cost control become relatively simple and easy, and the negative influence of the coke quality change on the blast furnace production is reduced.
Detailed Description
The present invention is further illustrated but not limited in any way by the following description, and any alterations or substitutions based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention comprises the following steps:
A. taking main coking coal for coking, and detecting the maximum average reflectivity
And distribution;
B. then carrying out a coke oven coking test of 200kg on the main coke coal for focusing to obtain coke, and detecting the cold crushing strength M40 and the hot reaction post-strength CSR;
C. summarizing, classifying coal types according to the following table
D. 1/3 coking coal, mixed main coking coal I and mixed main coking coal II are respectively loaded into a coal blending groove, and mixed main coking coal II, which is fed into a coke oven carbonization chamber for coking after being blended by a variable frequency coal blending belt according to the dry coal amount of 1/3 coking coal 50-60%, mixed main coking coal I15-25% and mixed main coking coal II 15-30%.
Detecting the maximum average reflectance as described in step A
And the detection method of the distribution is carried out according to GB/T6948-2008.
The detection in the step A also comprises the detection of Vdaf, G value and Y value, and the detection method is carried out according to GB/T212-2008, GB/T5447-1997 and GB/T479-2000.
And C, the classification parameters of the coal types in the step C further comprise Vdaf, G values and Y values, and the specific parameters are executed by referring to GB/T5751-2009.
The 200kg coke oven test in the step B refers to a process of charging coking coal into a 200kg test coke oven and performing dry distillation to obtain coke.
The dry distillation temperature is 1050-1010 ℃.
The dry distillation time is 16-16.5 hours.
The detection method of the cold crushing strength M40 is a method specified in GB/T2006-2008 standard.
The detection method of the intensity CSR after the thermal state reaction is a method specified by GB/T4000-2008 standard.
The working principle and the working process of the invention are as follows: according to the national standard, the indexes of coking coal at the same mining point are similar, but the quality indexes of cokes obtained by coking are extremely inconsistent, and the maximum average reflectivity of vitrinite is adopted
The distribution, coke cold crushing strength M40 and hot reacted strength CSR indexes classify the coking mixed main coking coal, so that the guidance of product quality on coal classification is strengthened, the inherent quality requirement of raw material coal is considered, the coking coal can be dynamically and objectively classified and managed, the use value is reasonably judged, the adjustment control of a single coke index M40 or CSR and the quality of the raw material coal are in one-to-one correspondence (the ratio of the mixed main coking coal I is increased in production organization, the coke CSR index can be increased, and vice versa), the ratio of the mixed main coking coal II is increased, the coke M40 index can be increased, and vice versa), the coke quality and cost control is relatively simple and easy, and the negative influence of coke quality change on blast furnace production is reduced.
The invention is further illustrated with reference to the following examples:
example 1
The invention provides a method for finely classifying coking coal, which comprises the following steps:
A. the method for detecting the process indexes of the flat-wave coking coal comprises the following steps: vdaf 24.24%, G91, Y19.0 mm, maximum average reflectance
1.417, and its distribution is 1.2% -1.7% and 91.7%.
B. 262kg of coking coal with 10% of water content was charged into a 200kg test coke oven and dry distilled for 16.5 hours under the heating conditions of 1050 ℃ and 1010 ℃ to obtain 199kg of coke.
C. According to the method specified in GB/T2006-2008 standard, the cold crushing strength M40 of a 200kg coke oven coke sample is 81.87 percent.
D. According to the method specified in GB/T4000-2008 standard, the intensity CSR of the coke sample of 200kg coke oven after thermal state reaction is detected to be 45.97%.
E. The coal is mixed main coking coal II (25 # coking coal according to GB/T5751-2009).
F. Respectively loading 1/3 coking coal, mixed main coking coal I and mixed main coking coal II into a coal blending groove, and metering dry coal by using a variable-frequency coal blending belt: the traditional classification method comprises the following steps of 1/3, 55% of coking coal and 45% of main coking coal mixture: 1/3 coking coal 55%, mixed main coking coal I20% and mixed main coking coal II 25% are mixed and then sent into a coke oven carbonization chamber for coking. The former coke quality index M4087.25%, CSR 64.25%; the latter coke quality index M4087.95% and CSR 63.15%. The coke M40 index is improved by increasing the proportion of the main mixed coke coal II, and the aim of conveniently controlling the coke quality and cost is achieved.
Example 2
The invention provides a method for finely classifying coking coal, which comprises the following steps:
A. the method for detecting the process indexes of the flat-wave coking coal comprises the following steps: vdaf 24.24%, G91, Y19.0 mm, maximum average reflectance
1.417, and its distribution is 1.2% -1.7% and 91.7%.
B. 262kg of coking coal with 10% of water content was charged into a 200kg test coke oven and dry distilled for 16.5 hours under the heating conditions of 1050 ℃ and 1010 ℃ to obtain 199kg of coke.
C. According to the method specified in GB/T2006-2008 standard, the cold crushing strength M40 of a 200kg coke oven coke sample is 81.87 percent.
D. According to the method specified in GB/T4000-2008 standard, the intensity CSR of the coke sample of 200kg coke oven after thermal state reaction is detected to be 45.97%.
E. The coal is mixed main coking coal II (25 # coking coal according to GB/T5751-2009).
F. Respectively loading 1/3 coking coal, mixed main coking coal I and mixed main coking coal II into a coal blending groove, and metering dry coal by using a variable-frequency coal blending belt: traditional classification method 1/3 coking coal 50%, mixed main coking coal 50%: the new classification method 1/3 mixes 50% of coking coal, 20% of mixed main coking coal I and 30% of mixed main coking coal II and then sends the mixture into a coke oven carbonization chamber for coking. The former coke quality index M4086.85%, CSR 64.05%; the latter coke quality index M4087.05% and CSR 63.55%. The coke M40 index is improved by increasing the proportion of the main mixed coke coal II, and the aim of conveniently controlling the coke quality and cost is achieved.
Example 3
The invention provides a method for finely classifying coking coal, which comprises the following steps:
A. the method for detecting the process indexes of the Chuan refined coking coal comprises the following steps: vdaf 22.26%, G74, Y9.0 mm, maximum average reflectance
1.496, and the distribution is 1.2 percent to 1.7 percent and 73.8 percent.
B. 261kg of coking coal with 10% of water content was charged into a 200kg test coke oven and subjected to dry distillation at 1050-1010 ℃ for 16 hours to obtain 197kg of coke.
C. According to the method specified in GB/T2006-2008 standard, the cold crushing strength M40 of a 200kg coke oven coke sample is 76.45 percent.
D. According to the method specified in GB/T4000-2008 standard, the intensity CSR of the coke sample of the 200kg coke oven after the thermal state reaction is detected to be 61.15 percent.
E. The coal is mixed with main coking coal I according to a fine classification method of coking coal (the national standard GB/T5751-2009 is No. 25 coking coal).
F. Respectively loading 1/3 coking coal, mixed main coking coal I and mixed main coking coal II into a coal blending groove, and metering dry coal by using a variable-frequency coal blending belt: the traditional classification method comprises the following steps of 1/3, 55% of coking coal and 45% of main coking coal mixture: 1/3 coking coal 55%, mixed main coking coal I30% and mixed main coking coal II 15% are mixed and then sent into a coke oven carbonization chamber for coking. The former coke quality index M4087.25%, CSR 64.25%; the latter coke quality index M4086.75% and CSR 65.85%. The CSR index of the coke is improved by increasing the proportion of the main mixed coking coal I, so that the aim of conveniently controlling the quality and the cost of the coke is fulfilled.
Example 4
The invention provides a method for finely classifying coking coal, which comprises the following steps:
A. the method for detecting the process indexes of the Chuan refined coking coal comprises the following steps: vdaf 22.26%, G74, Y9.0 mm, maximum average reflectance
1.496, and the distribution is 1.2 percent to 1.7 percent and 73.8 percent.
B. 261kg of coking coal with 10% of water content was charged into a 200kg test coke oven and subjected to dry distillation at 1050-1010 ℃ for 16 hours to obtain 197kg of coke.
C. According to the method specified in GB/T2006-2008 standard, the cold crushing strength M40 of a 200kg coke oven coke sample is 76.45 percent.
D. According to the method specified in GB/T4000-2008 standard, the intensity CSR of the coke sample of the 200kg coke oven after the thermal state reaction is detected to be 61.15 percent.
E. The coal is mixed with main coking coal I according to a fine classification method of coking coal (the national standard GB/T5751-2009 is No. 25 coking coal).
F. Respectively loading 1/3 coking coal, mixed main coking coal I and mixed main coking coal II into a coal blending groove, and metering dry coal by using a variable-frequency coal blending belt: the traditional classification method comprises the following steps of 1/3, 55% of coking coal and 45% of main coking coal mixture: the new classification method is that 1/3 coking coal 60%, mixed main coking coal I25% and mixed main coking coal II 15% are mixed and then sent into a coke oven carbonization chamber for coking. The former coke quality index M4086.55%, CSR 63.85%; the latter coke quality index M4086.15% and CSR 64.75%. The CSR index of the coke is improved by increasing the proportion of the main mixed coking coal I, so that the aim of conveniently controlling the quality and the cost of the coke is fulfilled.
Claims (9)
1. A method for classifying mixed main coking coal for coking is characterized by comprising the following steps:
A. taking main coking coal for coking, and detecting the maximum average reflectivity
And distribution;
B. then carrying out a coke oven coking test of 200kg on the main coke coal for focusing to obtain coke, and detecting the cold crushing strength M40 and the hot reaction post-strength CSR;
C. summarizing, classifying coal types according to the following table
D. 1/3 coking coal, mixed main coking coal I and mixed main coking coal II are respectively loaded into a coal blending groove, and mixed main coking coal II, which is fed into a coke oven carbonization chamber for coking after being blended by a variable frequency coal blending belt according to the dry coal amount of 1/3 coking coal 50-60%, mixed main coking coal I15-25% and mixed main coking coal II 15-30%.
2. The method of classifying blended main coke coal for coking according to claim 1, wherein: detecting the maximum average reflectance as described in step A
And the detection method of the distribution is carried out according to GB/T6948-2008.
3. The method of classifying blended main coke coal for coking according to claim 1, wherein: the detection in the step A also comprises the detection of Vdaf, G value and Y value, and the detection method is carried out according to GB/T212-2008, GB/T5447-1997 and GB/T479-2000.
4. The method of classifying blended main coke coal for coking according to claim 1, wherein: and C, the classification parameters of the coal types in the step C further comprise Vdaf, G values and Y values, and the specific parameters are executed by referring to GB/T5751-2009.
5. The method of classifying blended main coke coal for coking according to claim 1, wherein: the 200kg coke oven test in the step B refers to a process of charging coking coal into a 200kg test coke oven and performing dry distillation to obtain coke.
6. The method of classifying blended main coke coal for coking according to claim 5, wherein: the dry distillation temperature is 1050-1010 ℃.
7. The method of classifying blended main coke coal for coking according to claim 5, wherein: the dry distillation time is 16-16.5 hours.
8. The method of classifying blended main coke coal for coking according to claim 1, wherein: the detection method of the cold crushing strength M40 is a method specified in GB/T2006-2008 standard.
9. The method of classifying blended main coke coal for coking according to claim 1, wherein: the detection method of the intensity CSR after the thermal state reaction is a method specified by GB/T4000-2008 standard.
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| CN112574767A (en) * | 2020-11-16 | 2021-03-30 | 包头钢铁（集团）有限责任公司 | Determination method for stably improving core process of coking coal thermal state performance detection precision |
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| US20130008771A1 (en) * | 2008-09-05 | 2013-01-10 | Purdue Research Foundation | Multipurpose coke plant for synthetic fuel production |
| CN104164246A (en) * | 2014-08-22 | 2014-11-26 | 江苏沙钢集团有限公司 | Coal blending expert system fit for top-loading coke oven |
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Patent Citations (3)
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| US20130008771A1 (en) * | 2008-09-05 | 2013-01-10 | Purdue Research Foundation | Multipurpose coke plant for synthetic fuel production |
| CN102690670A (en) * | 2012-05-23 | 2012-09-26 | 武汉钢铁(集团)公司 | Coal blending and coking method with participation of 1/3 coking coal having volatile of 28-32% |
| CN104164246A (en) * | 2014-08-22 | 2014-11-26 | 江苏沙钢集团有限公司 | Coal blending expert system fit for top-loading coke oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112574767A (en) * | 2020-11-16 | 2021-03-30 | 包头钢铁（集团）有限责任公司 | Determination method for stably improving core process of coking coal thermal state performance detection precision |
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