CN113621393A - Classification matching method for coking coal with volatile content of 18-22% - Google Patents
Classification matching method for coking coal with volatile content of 18-22% Download PDFInfo
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- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
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Abstract
The invention discloses a classification and distribution method of coking coal with 18-22% of volatile matter, which is characterized in that according to the difference of free expansion ordinal number and coking structure characteristics, the G value is 75-82, the volatile matter is 18-22%, and the fluidity is high<100ddpm coking coal is matched in a classified mode, and coking coal with different qualities can be replaced correspondingly according to different numerical values of relevant indexes, so that resources can be reasonably utilized, the coal matching cost is reduced, a top-mounted coke oven with the length of 6 meters or more is used for coking, and the obtained coke CSR>68％，M40>88％，M10<6.0 percent, and the coke mass satisfies 3000m3As required by the blast furnace.
Description
Technical Field
The invention belongs to the technical field of coal blending and coking, and particularly relates to a classification blending method of coking coal with 18-22% of volatile components.
Background
The coking coal is the main support of the coke quality, and the quality of the coking coal has great influence on the coke quality. Most coking enterprises evaluate and use the coking coal according to the G value and the volatile component (or vitrinite reflectance). In general, the coking coal is used as skeleton coal, the blending proportion is higher, the requirement on the G value is higher, the blending of the coking coal with high G value is high, and the blending of the coking coal with low G value is low. In actual production, 3000m is produced3The coke required by the large blast furnace has low fluidity and low G value, and is often used as common coal-quality coking coal (namely, inferior coking coal) for blending.
Disclosure of Invention
The invention aims to solve the technical problem of providing a classification and blending method of coking coal with 18-22% of volatile matter, which can fully use the coking coal, reduce blending of high-quality coking coal under a certain condition, reduce blending cost, coke oven with a top loading of 6 meters or more and coke oven with a top loading of 6 meters or more for coking, and obtain coke CSR>68％，M40>88％，M10<6.0 percent, and the coke mass satisfies 3000m3As required by the blast furnace.
In order to solve the technical problems, the technical scheme provided by the invention comprises the following steps:
1) the following coal types are selected for blending coking:
gas fat coal, lean coal, 1/3 coking coal 1#, 1/3 coking coal 2#, coking coal 1#, coking coal 2#, coking coal 3#, and coking coal with 18% -22% of volatile components;
the fat coal is Vdaf: 28 to 33% fluidity>10000ddpm, degree of swelling b>80% of fat coal;
the 1/3 coking coal No. 1 has G value not less than 85 and V valuedaf<33% 1/3 coking coal;
the 1/3 coking coal No. 2 is G value≥85，VdafNot less than 33% of 1/3 coking coal;
the number 1 of the coking coal is the coking coal with a G value of more than or equal to 85, a sulfur content of less than or equal to 0.6 percent, a coarse grain mosaic structure of more than or equal to 55 percent, a fluidity of more than or equal to 100ddpm and a volatile matter content of more than 18 percent;
the coking coal No. 2 is coking coal with a G value of 80-85, a sulfur content of 0.7-1.8%, a coarse grain mosaic structure of 48-55%, a fluidity of more than or equal to 100ddpm and a volatile content of more than 18%;
the coking coal No. 3 is coking coal with a future G value of 80-85%, a sulfur content of less than or equal to 0.7%, a coarse grain mosaic structure of 48-55%, a fluidity of more than or equal to 100ddpm and a volatile content of more than 18%;
the lean coal is a lean coal with a G value of more than 25;
the coking coal with 18-22% of volatile components is coking coal with a G value of 75-82 and a fluidity of less than 100 ddpm;
the standard coal blending scheme of the coking coal without 18 to 22 percent of volatile matter is as follows: gas fertilization of coal: 0 to 5 percent; coal fertilizing: 18 to 20 percent; 1/3 coking coal 1 #: 8-13%; 1/3 coking coal 2 #: 5-10%; 1# of coking coal: 20-25%, and coking coal 2 #: 20 to 23 percent; 3# of coking coal: 3-6%; lean coal: 12 to 14 percent.
2) The method comprises the following steps of (1) classifying and replacing coking coal with 18-22% of volatile:
classifying and blending the coking coal with 18-22% of volatile components according to the difference of free expansion numbers (FSI) and coking structure characteristics, wherein the relevant numerical values of the FSI and the coking structure characteristics are set as follows:
21)FSI≥7；
22) the structural characteristics of coke formation: the coarse grain mosaic structure is more than or equal to 50 percent;
for the coal which meets the relevant value setting conditions of 21) and 22), replacing the coking coal with No. 1;
if the sulfur content is 0.7-1.8% and does not meet the relevant value setting conditions of 21) and/or 22), replacing coking coal No. 2 for blending; if the sulfur content is less than or equal to 0.7 percent, replacing coking coal No. 3 for blending.
3) Alternative adaptation method
31) The blending amount of the coking coal with the volatile component of 18-22% blended for replacing coking coal No. 1 is 8-15% in the blending coal, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme of the step 1) (namely, if the blending amount of the coking coal No. 1 is 25% in the specific standard coal blending scheme, and when the volatile component replacing blending amount is 8%, the blending amount of the coking coal No. 1 is 25% -8% ═ 17%), the blending amount of other coking coals is unchanged, the volatile component of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
32) The blending amount of the coking coal which replaces 18-22% of volatile matters for blending coking coal No. 2 in the blending coal is 10-18%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile matters of the blending coal are less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
33) The blending amount of the coking coal for replacing coking coal No. 3 is 18-22%, the blending amount of the coking coal in the blending coal is 3-6%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile content of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
The invention combines the free expansion number (FSI) and the coking structure characteristics of the low-flow coking coal with 18-22% of volatile components for classification and distribution, and can avoid that the coal distribution method at the present stage has a small G value (75-82) and low fluidity (<100ddpm) as poor coking coal, thereby reasonably utilizing resources and reducing coal blending cost, and the top-loading coke oven with the length of 6 meters or more can coke, and the obtained coke CSR>68％，M40>88％，M10<6.0 percent, and the coke mass satisfies 3000m3As required by the blast furnace.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Step 1) selecting the following coal types for blending coking, and further classifying the indexes of the coal types on the basis of meeting the national standard:
the coking coal comprises gas fat coal, lean coal, 1/3 coking coal 1#, 1/3 coking coal 2#, coking coal 1#, coking coal 2#, coking coal 3# and coking coal with 18% -22% of volatile components, wherein:
coal fertilizing: vdaf：28～33 percent, the fluidity is more than or equal to 10000ddpm, and the expansion degree b is more than or equal to 80 percent.
1/3 coking coal 1 #: g value is greater than or equal to 85, Vdaf<33％。
1/3 coking coal 2 #: g value is greater than or equal to 85, Vdaf≥33％。
1# of coking coal: g value is more than or equal to 85, sulfur content is less than or equal to 0.6%, coarse grain mosaic structure is more than or equal to 55%, fluidity is more than or equal to 100ddpm, and volatile content is more than 18%.
Coking coal 2 #: g value: 80-85, sulfur content: 0.7-1.8%, a coarse grain mosaic structure 48-55%, the fluidity is not less than 100ddpm, and the volatile component is more than 18%.
3# of coking coal: g value: 80-85, sulfur content: not more than 0.7 percent, 48-55 percent of coarse grain mosaic structure, more than or equal to 100ddpm of fluidity and more than 18 percent of volatile component.
Lean coal: the G value is > 25.
The coking coal with 18% -22% of volatile components is the coking coal with a G value of 75-82 and a fluidity of less than 100 ddpm.
The standard coal blending scheme of the coking coal without 18 to 22 percent of volatile matter is as follows: gas fertilization of coal: 0 to 5 percent; coal fertilizing: 18 to 20 percent; 1/3 coking coal 1 #: 8-13%; 1/3 coking coal 2 #: 5-10%; 1# of coking coal: 20-25%, and coking coal 2 #: 20 to 23 percent; 3# of coking coal: 3-6%; lean coal: 12 to 14 percent.
Step 2) classifying and replacing coking coal with 18-22% of volatile matter for use:
classifying and blending the coking coal with 18-22% of volatile components according to the difference of free expansion numbers (FSI) and coking structure characteristics, wherein the relevant numerical values of the FSI and the coking structure characteristics are set as follows:
21)FSI≥7；
22) the structural characteristics of coke formation: the coarse grain mosaic structure is more than or equal to 50 percent;
for the coal which meets the relevant value setting conditions of 21) and 22), replacing the coking coal with No. 1;
if the sulfur content is 0.7-1.8% and does not meet the relevant value setting conditions of 21) and/or 22), replacing coking coal No. 2 for blending; if the sulfur content is less than or equal to 0.7 percent, replacing coking coal No. 3 for blending.
Step 3) alternative blending method
31) The blending amount of the coking coal with the volatile component of 18-22% blended for replacing coking coal No. 1 is 8-15% in the blending coal, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme of the step 1) (namely, if the blending amount of the coking coal No. 1 is 25% in the specific standard coal blending scheme, and when the volatile component replacing blending amount is 8%, the blending amount of the coking coal No. 1 is 25% -8% ═ 17%), the blending amount of other coking coals is unchanged, the volatile component of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
32) The blending amount of the coking coal which replaces 18-22% of volatile matters for blending coking coal No. 2 in the blending coal is 10-18%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile matters of the blending coal are less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
33) The blending amount of the coking coal for replacing coking coal No. 3 is 18-22%, the blending amount of the coking coal in the blending coal is 3-6%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile content of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
Example (b):
the coal quality analysis data of coking coal 1#, coking coal 2#, coking coal 3#, 1/3 coking coal 1#, 1/3 coking coal 2#, gas fat coal, lean coal and coking coal with 18% -22% of volatile components in a certain coking plant are shown in table 1.
TABLE 1 Single coal Experimental data
Step 2: coking performance of the coking coal and the 1/3 coking coal single coal was analyzed. And step 3: determining a coal blending scheme, wherein the blending range of various coal types is as follows:
TABLE 2 coal blending protocol
TABLE 3 comparison of coal blending index and coke quality
| Scheme(s) | Vdaf/％ | St,d/％ | G | Y/mm | M40/％ | M10/％ | CRI/％ | CSR％ |
| Reference scheme 1 | 26.58 | 0.94 | 81 | 16 | 88.6 | 5.9 | 22.4 | 69 |
| Comparative scheme 2 | 26.13 | 0.95 | 80 | 16 | 88.7 | 5.9 | 22.3 | 69.1 |
| Comparative scheme 3 | 25.79 | 0.97 | 75 | 14 | 86.0 | 6.5 | 22.5 | 66.0 |
| Comparative scheme 4 | 26.46 | 0.94 | 80 | 16 | 88.8 | 5.9 | 22.3 | 69.1 |
| Comparative scheme 5 | 23.97 | 0.69 | 80 | 16 | 88.8 | 5.9 | 22.4 | 69.5 |
| Comparative scheme 6 | 26.09 | 0.75 | 76 | 14 | 86.0 | 6.3 | 23.0 | 67.0 |
The implementation effect is as follows:
the coking coal with the volatile matter of 18-22% provided by the invention is used for classification and substitution, so that the high-quality coking coal blending can be reduced, the coal blending cost is reduced, a top-mounted coke oven with the size of 6 meters or more is used for coking, and the obtained coke CSR>68％，M40>88％，M10<6.0 percent, and the coke mass satisfies 3000m3As required by the blast furnace.
Claims (1)
1. A classification matching method of coking coal with 18-22% of volatile matter is characterized by comprising the following steps: the method comprises the following steps:
1) the following coal types are selected for blending coking:
gas fat coal, lean coal, 1/3 coking coal 1#, 1/3 coking coal 2#, coking coal 1#, coking coal 2#, coking coal 3#, and coking coal with 18% -22% of volatile components;
the fat coal is Vdaf: 28 to 33% fluidity>10000ddpm, degree of swelling b>80% of fat coal;
the 1/3 coking coal No. 1 has G value not less than 85 and V valuedaf<33% 1/3 coking coal;
the G value of the 1/3 coking coal No. 2 is more than or equal to 85, VdafNot less than 33% of 1/3 coking coal;
the number 1 of the coking coal is the coking coal with a G value of more than or equal to 85, a sulfur content of less than or equal to 0.6 percent, a coarse grain mosaic structure of more than or equal to 55 percent, a fluidity of more than or equal to 100ddpm and a volatile matter content of more than 18 percent;
the coking coal No. 2 is coking coal with a G value of 80-85, a sulfur content of 0.7-1.8%, a coarse grain mosaic structure of 48-55%, a fluidity of more than or equal to 100ddpm and a volatile content of more than 18%;
the coking coal No. 3 is coking coal with a future G value of 80-85%, a sulfur content of less than or equal to 0.7%, a coarse grain mosaic structure of 48-55%, a fluidity of more than or equal to 100ddpm and a volatile content of more than 18%;
the lean coal is a lean coal with a G value of more than 25;
the coking coal with 18-22% of volatile components is coking coal with a G value of 75-82 and a fluidity of less than 100 ddpm;
the standard coal blending scheme of the coking coal without 18 to 22 percent of volatile matter is as follows: gas fertilization of coal: 0 to 5 percent; coal fertilizing: 18 to 20 percent; 1/3 coking coal 1 #: 8-13%; 1/3 coking coal 2 #: 5-10%; 1# of coking coal: 20-25%, and coking coal 2 #: 20 to 23 percent; 3# of coking coal: 3-6%; lean coal: 12 to 14 percent;
2) the method comprises the following steps of (1) classifying and replacing coking coal with 18-22% of volatile:
classifying and blending the coking coal with 18-22% of volatile components according to the difference of free expansion numbers (FSI) and coking structural characteristics, wherein the relevant numerical values of the FSI and the coking structural characteristics are set as follows:
21)FSI≥7；
22) the structural characteristics of coke formation: the coarse grain mosaic structure is more than or equal to 50 percent;
for the coal which meets the relevant value setting conditions of 21) and 22), replacing the coking coal with No. 1;
if the sulfur content is 0.7-1.8% and does not meet the relevant value setting conditions of 21) and/or 22), replacing coking coal No. 2 for blending; if the sulfur content is less than or equal to 0.7 percent, replacing coking coal No. 3 for blending;
3) alternative adaptation method
31) The blending amount of the coking coal with the volatile component of 18-22% for blending the substitute coking coal No. 1 in the blending coal is 8-15%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile component of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%;
32) the blending amount of the coking coal which replaces 18-22% of volatile matters for blending coking coal No. 2 in the blending coal is 10-18%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile matters of the blending coal are less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%;
33) the blending amount of the coking coal for replacing coking coal No. 3 is 18-22%, the blending amount of the coking coal in the blending coal is 3-6%, the blending amount of the coking coal No. 1 is correspondingly reduced according to the standard coal blending scheme in the step 1), the blending amount of other coking coals is unchanged, the volatile content of the blending coal is less than 27%, the G value is 80-82, the Y value is 15-17 mm, and the sulfur content is less than 0.98%.
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