CN102851049A - Coal blending method for high-reactivity coke for blast furnace - Google Patents
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Abstract
A coal blending method for high-reactivity coke for a blast furnace includes blending coking coal, wherein the coking coal contains gas coal 10-40, 1/3 coking coal 10-30, rich coal 20-50, coking coal 20-50, and mixture of lean coal and iron ore powder 5-15 wt%, and the mixture of lean coal and iron ore powder contains lean coal 50-70 and iron ore powder 30-50 wt%. The inventive method adopts high-grade iron ore powder to replace a part of lean coal, to obviously improve reactivity of coke with carbon dioxide, to thereby reduce blast furnace fuel ratio and carbon dioxide discharge amount, and improve reaction efficiency in the blast furnace, thus, blast furnace production is energy saving and environment friendly.
Description
Technical field
The present invention relates to the blast furnace coke field, relate in particular to a kind of high reaction activity coke blending method.
Background technology
Coal-blending coking is that the raw material as coking added coke oven after several different classes of coking coals were cooperated by a certain percentage, by the secluding air retort process formation coke of certain hour certain temperature, as the raw material of blast furnace ironmaking.Coking coal kind commonly used has bottle coal, 1/3 coking coal, rich coal, coking coal, lean coal, the independent coking of most of coking coals all can not be produced the coke that meets the requirement of blast furnace Coke Quality, and cohesiveness and coking property all the preferably independent coking of coking coal and rich coal can obtain the qualified coke of intensity, but the one, wasted the coking coal resource of high-quality, the 2nd, the independent coking of coking coal meeting produces the stronger swelling pressure and affects the work-ing life of coke oven or cause the coke pushing difficulty, and the coke of the independent coking of rich coal easily forms coke beehive and affects coke quality.Bottle coal is poorer than coking coal, rich coal with the coking property of 1/3 coking coal, but its swelling pressure are little, shrink greatly, fugitive constituent is high, can play to reduce the swelling pressure, increase and shrink, make the effect that coke pushing reaches smoothly increases chemical products and coal gas, the lean coal bad adhesion, coke wears no resistance during independent coking, but its shrinkage crack is few, allocates the lumpiness that lean coal can improve coke in the coal blending into.So the coking coal with above several kinds in the production is used in conjunction with, rich coal, coking coal are main, and bottle coal, 1/3 coking coal, lean coal are auxiliary, bring into play the characteristics of all kinds of coals in process of coking, produce the satisfactory coke of quality with the Coal Blending Schemes of economical rationality.Table 1 is Chinese coking coal classification abridged table.
(annotate: the lean coal pyrolysis can not produce plastic mass, so without maximum thickness of plastic layer Y/mm index)
Coke mainly plays heat supply, reductive agent, skeleton and confession carbon in blast furnace, in blast furnace under the certain temperature with CO
2Reacting produces the CO reducing iron ore, and the reactive behavior of coke is produced most important for blast furnace, and the reactive behavior that improves coke can reduce fuel ratio and CO
2Quantity discharged, reach the effect of energy-saving and emission-reduction.
In the prior art a kind of method that improves the coke gasification reaction activity is disclosed at present, the patent of invention " high reactivity and high strength coke for blast furnace and manufacture method thereof " on Japan flower ridge great two, the patent No. " CN1341143A ", a few trade mark coal of the medium charring degree of several low flows is cooperated coking and the cheap a kind of coke that makes, mainly be in the method will low degree of mobilization medium caking coal account for 60% mixed coal and carry out destructive distillation and obtain required coke.This method of making high reactivity and high strength coke requires to exist in the coal blending coal in a large amount of special several trades mark or the place of production, or allocate the mineral with catalytic property outward into and in coal blending, produce, the former has very strong limitation to coal blending, and the latter also do not have at present concrete can for the production of manufacture method occur.
Summary of the invention
Technical problem to be solved by this invention provides the high reaction activity coke blending method that a kind of blast furnace is used, and with high grade iron breeze Substitute For Partial lean coal, has obviously improved coke and CO in this blending method
2Reactive behavior.
The present invention is achieved in that the high reaction activity coke blending method that a kind of blast furnace is used, comprise that the coking coal that will participate in coal blending is mixed, by weight percentage, the coking coal that participates in coal blending comprises the mixture 5 ~ 15% of bottle coal 10 ~ 40%, 1/3 coking coal 10 ~ 30%, rich coal 20 ~ 50%, coking coal 20 ~ 50%, lean coal and powdered iron ore, by weight percentage lean coal 50% ~ 70%, powdered iron ore 30% ~ 50% in the mixture of described lean coal and powdered iron ore.
Described powdered iron ore is the high grade iron breeze of Fe content 60 ~ 72%, more than granularity 100 orders.
The cold strength index of the coke after finishing is JIS rotary drum DI
150 15(%) 〉=78, Micoud nurse rotary drum M
40(%) 〉=78, Micoud nurse rotary drum M
10(%)≤10.
By weight percentage, the coking coal that participates in coal blending comprises Henan rich coal 25%, Canadian coking coal 25%, Shandong 1/3 coking coal 15%, Jiangsu bottle coal 25%, Shanxi lean coal 5% ~ 7%, powdered iron ore 3% ~ 5%, and the cold strength index of the coke after coking is finished is JIS rotary drum DI
150 15(%) 85 ~ 87.5, Micoud nurse rotary drum M
40(%) 80 ~ 85, Micoud nurse rotary drum M
10(%) 5 ~ 8.
With high grade iron breeze Substitute For Partial lean coal, coke and CO have obviously been improved in the high reaction activity coke blending method that blast furnace of the present invention is used
2Reactive behavior, thereby reduce blast furnace fuel than and CO
2Quantity discharged, improved high reaction in furnace efficient, make blast furnace produce more energy-conserving and environment-protective.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's statement, these equivalent form of values fall within the application's appended claims limited range equally.
The high reaction activity coke blending method that a kind of blast furnace is used, comprise that the coking coal that will participate in coal blending is mixed, by weight percentage, the coking coal that participates in coal blending comprises the mixture 5 ~ 15% of bottle coal 10 ~ 40%, 1/3 coking coal 10 ~ 30%, rich coal 20 ~ 50%, coking coal 20 ~ 50%, lean coal and powdered iron ore, by weight percentage lean coal 50% ~ 70%, powdered iron ore Fe in the mixture of described lean coal and powdered iron ore
2O
330% ~ 50%, described powdered iron ore is the high grade iron breeze of Fe content 60 ~ 72%, more than granularity 100 orders (≤0.154mm).
In order to guarantee to improve the quality of active rear coke, require to use the cold strength index of the coke after the coking of this blending method is finished to be JIS rotary drum DI among the present invention
150 15(%) 〉=78, Micoud nurse rotary drum M
25(%) 〉=85, Micoud nurse rotary drum M
10(%)≤10.JIS rotary drum DI
150 15, Micoud nurse rotary drum M
25, Micoud nurse rotary drum M
10Three kinds of physical strength indexs that index is coke: in the rotary drum of certain specification and test conditions, rotate certain revolution with quantitative coke, reach the sassafras of mutually clashing into, rub between coke and the drum wall in the drum between the coke, cause coke cracking and wearing and tearing, account for into the percentage of bulging coke with the amount of coke that turns rear a certain grade and evaluate coke strenth.JIS rotary drum DI
150 15For the above coke 10kg of grade 50mm in the JIS rotary drum, turn 150 turn after percentage more than the 15mm grade; M
40For the above coke 50kg of grade 50mm in Micoud nurse rotary drum, turn 100 turn after percentage more than the 40mm grade; M
10For the above coke 50kg of grade 50mm in Micoud nurse rotary drum, turn 100 turn after percentage below the 10mm grade.
Measuring method this patent for the coke gasification reaction activity adopts thermogravimetry, and equipment adopts NETZSCH STA series (the anti-STA series of holding) thermal-analysis instrumentation, and support and Al are analyzed in thermogravimetric analysis
2O
3Crucible.Burnt one of shaft is got in sample preparation at random, cuts the piece of 1cm thickness, and then with the walk around right cylinder of cut-off footpath 0.9cm of platform, this coke cylinder dimensions is high 1cm, diameter 0.9cm, and quality is 650 ± 40mg.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature ~ 1100 ℃ temperature rise rate is 5 ~ 10K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases.On-test,, front furnace body vacuumized, and experiment condition is by above heating schedule and reaction atmosphere operation, and the weight-loss curve of deriving coke after experiment finishes compares.Adopt in the present embodiment the weight-loss curve of coke under 1100 ℃ of constant temperature, this curve is a straight line, the percentage loss of weight of Calculation of Coke per minute, represent with WL%/min, method of calculation are the total rate of weight loss of statistics coke under 1100 ℃ of constant temperature, then divided by constant temperature time, and square formula 1.
WL%/min=
(1)
WL% is the total rate of weight loss under 1100 ℃ of constant temperature.
T is 1100 ℃ of constant temperature times, min.
The raw material of coke is for mixing coal, have unavoidably the sampling non-uniform phenomenon of coke weave construction, find that according to statistics the collimation (error that the sample inequality causes) of WL%/min of same coke is in 0.02%/min, both thought the coke that makes with respect to basic Coal Blending Schemes (former coal blending scheme), its WL%/min of coke that the inventive method is produced improves more than the 0.02%/min than basic Coal Blending Schemes coke, just can think that the reactive behavior of the coke that the inventive method is produced has improved.
Coking coal classification and index are as shown in table 2 in the Coal Blending Schemes that blast furnace production is adopted in the present embodiment, table 3 is the proportioning of embodiment 1 ~ 3 Coal Blending Schemes among the proportioning of basic Coal Blending Schemes and the present invention, and the granularity of used powdered iron ore is 100 orders (0.154mm) among the embodiment 1 ~ 3.
After preparing by 4 kinds of Coal Blending Schemes among above base case and the embodiment 1 ~ 3, humidity is adjusted into 5%, adopts respectively the mode coking of coalingging of tradition top, and coking time is 18h, and the coking final temperature is 1000 ℃, dry coke quenching.The cold strength index of the coke that makes sees Table 4.
The coke that above 4 kinds of Coal Blending Schemes make is got respectively burnt one of shaft, obtain the right cylinder of high 1cm, diameter 0.9cm by sample preparation, base case coke small cylinder quality 628mg, embodiment 1 scheme coke small cylinder quality 653mg, embodiment 2 scheme coke small cylinder quality 663mg, embodiment 3 scheme coke small cylinder quality 671mg adopt NETZSCH STA 409PC/PG thermal-analysis instrumentation, and TG analyzes support and Al
2O
3Crucible.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature ~ 800 ℃ temperature rise rate is 10K/min, and 800 ℃ ~ 1100 ℃ temperature rise rates are 5K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases, on-test front furnace body vacuumize.The calculation result of WL%/min is as shown in table 5, and embodiment 1,2,3 WL%/min all improve more than the 0.02%/min than basic Coal Blending Schemes coke, and the reactive behavior of embodiment 1,2,3 coke obviously improves.
Coking coal classification and index are as shown in table 2 in the Coal Blending Schemes that blast furnace production is adopted in the present embodiment, and table 6 is the proportioning of embodiment 4 ~ 6 Coal Blending Schemes among the proportioning of basic Coal Blending Schemes and the present invention, among the embodiment 4 ~ 6, and powdered iron ore Fe
2O
3Granularity be 150 orders (0.106mm).
After preparing by 4 kinds of Coal Blending Schemes among above base case and the embodiment 4 ~ 6, humidity is adjusted into 5%, adopts respectively the mode coking of coalingging of tradition top, and coking time is 18h, and the coking final temperature is 1000 ℃, dry coke quenching.The cold strength index of the coke that makes sees Table 7.
The coke that above 4 kinds of Coal Blending Schemes make is got respectively burnt one of shaft, obtain the right cylinder of high 1cm, diameter 0.9cm by sample preparation, base case coke small cylinder quality 625mg, embodiment 4 scheme coke small cylinder quality 650mg, embodiment 5 scheme coke small cylinder quality 660mg, embodiment 6 scheme coke small cylinder quality 670mg adopt NETZSCH STA 409PC/PG thermal-analysis instrumentation, and TG analyzes support and Al
2O
3Crucible.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature-800 ℃ temperature rise rate is 10K/min, and 800 ℃ of-1100 ℃ of temperature rise rates are 5K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases, on-test front furnace body vacuumize.The calculation result of WL%/min is as shown in table 8, and embodiment 4,5,6 WL%/min all improve more than the 0.02%/min than basic Coal Blending Schemes coke, and the reactive behavior of embodiment 4,5,6 coke obviously improves.
Coking coal classification and index are as shown in table 2 in the Coal Blending Schemes that blast furnace production is adopted in the present embodiment, and table 9 is the proportioning of embodiment 7 ~ 9 Coal Blending Schemes among the proportioning of basic Coal Blending Schemes and the present invention, among the embodiment 7 ~ 9, and powdered iron ore Fe
2O
3Granularity be 150 orders (0.106mm).
After preparing by 4 kinds of Coal Blending Schemes among above base case and the embodiment 7 ~ 9, humidity is adjusted into 5%, adopts respectively the mode coking of coalingging of tradition top, and coking time is 18h, and the coking final temperature is 1000 ℃, dry coke quenching.The cold strength index of the coke that makes sees Table 10.
The coke that above 4 kinds of Coal Blending Schemes make is got respectively burnt one of shaft, obtain the right cylinder of high 1cm, diameter 0.9cm by sample preparation, base case coke small cylinder quality 660mg, embodiment 4 scheme coke small cylinder quality 650mg, embodiment 5 scheme coke small cylinder quality 660mg, embodiment 6 scheme coke small cylinder quality 670mg adopt NETZSCH STA 409PC/PG thermal-analysis instrumentation, and TG analyzes support and Al
2O
3Crucible.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature-800 ℃ temperature rise rate is 10K/min, and 800 ℃ of-1100 ℃ of temperature rise rates are 5K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases, on-test front furnace body vacuumize.The calculation result of WL%/min is as shown in table 11, and embodiment 7,8,9 WL%/min all improve more than the 0.02%/min than basic Coal Blending Schemes coke, and the reactive behavior of embodiment 7,8,9 coke obviously improves.
Coking coal classification and index are as shown in table 2 in the Coal Blending Schemes that blast furnace production is adopted in the present embodiment, and table 12 is the proportioning of embodiment 10 ~ 12 Coal Blending Schemes among the proportioning of basic Coal Blending Schemes and the present invention, among the embodiment 10 ~ 12, and powdered iron ore Fe
2O
3Granularity be 200 orders (0.075mm).
After preparing by 4 kinds of Coal Blending Schemes among above base case and the embodiment 10 ~ 12, humidity is adjusted into 5%, adopts respectively the mode coking of coalingging of tradition top, and coking time is 18h, and the coking final temperature is 1000 ℃, dry coke quenching.The cold strength index of the coke that makes sees Table 13.
The coke that above 4 kinds of Coal Blending Schemes make is got respectively burnt one of shaft, obtain the right cylinder of high 1cm, diameter 0.9cm by sample preparation, base case coke small cylinder quality 635mg, embodiment 11 scheme coke small cylinder quality 650mg, embodiment 12 scheme coke small cylinder quality 660mg, embodiment 13 scheme coke small cylinder quality 670mg adopt NETZSCH STA 409PC/PG thermal-analysis instrumentation, and TG analyzes support and Al
2O
3Crucible.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature-800 ℃ temperature rise rate is 10K/min, and 800 ℃ of-1100 ℃ of temperature rise rates are 5K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases, on-test front furnace body vacuumize.The calculation result of WL%/min is as shown in table 14, and embodiment 10,11,12 WL%/min all improve more than the 0.02%/min than basic Coal Blending Schemes coke, and the reactive behavior of embodiment 10,11,12 coke obviously improves.
Coking coal classification and index are as shown in table 2 in the Coal Blending Schemes that blast furnace production is adopted in the present embodiment, and table 15 is the proportioning of embodiment 13 ~ 15 Coal Blending Schemes among the proportioning of basic Coal Blending Schemes and the present invention, among the embodiment 13 ~ 15, and powdered iron ore Fe
2O
3Granularity be 115 orders (0.125mm).
After preparing by 4 kinds of Coal Blending Schemes among above base case and the embodiment 13 ~ 15, humidity is adjusted into 5%, adopts respectively the mode coking of coalingging of tradition top, and coking time is 18h, and the coking final temperature is 1000 ℃, dry coke quenching.The cold strength index of the coke that makes sees Table 16.
The coke that above 4 kinds of Coal Blending Schemes make is got respectively burnt one of shaft, obtain the right cylinder of high 1cm, diameter 0.9cm by sample preparation, base case coke small cylinder quality 625mg, embodiment 13 scheme coke small cylinder quality 650mg, embodiment 14 scheme coke small cylinder quality 660mg, embodiment 15 scheme coke small cylinder quality 670mg adopt NETZSCH STA 409PC/PG thermal-analysis instrumentation, and TG analyzes support and Al
2O
3Crucible.Reaction atmosphere is CO
2, N
2, ratio is CO
2: N
2=1:1, CO
2Flow is 20ml/min, N
2Flow is 20ml/min, and reactant gases is by beginning under the room temperature to pass into until react end.Heating schedule is: room temperature-800 ℃ temperature rise rate is 10K/min, and 800 ℃ of-1100 ℃ of temperature rise rates are 5K/min, and 1100 ℃ of constant temperature 40min finish and stop to pass into reactant gases, on-test front furnace body vacuumize.The calculation result of WL%/min is shown in table 17, and embodiment 13,14,15 WL%/min all improve more than the 0.02%/min than basic Coal Blending Schemes coke, and the reactive behavior of embodiment 13,14,15 coke obviously improves.
Claims (4)
1. high reaction activity coke blending method that blast furnace is used, comprise that the coking coal that will participate in coal blending is mixed, it is characterized in that: by weight percentage, the coking coal that participates in coal blending comprises the mixture 5 ~ 15% of bottle coal 10 ~ 40%, 1/3 coking coal 10 ~ 30%, rich coal 20 ~ 50%, coking coal 20 ~ 50%, lean coal and powdered iron ore, is lean coal 50% ~ 70% and powdered iron ore 30% ~ 50% by weight percentage in the mixture of described lean coal and powdered iron ore.
2. the high reaction activity coke blending method used of blast furnace as claimed in claim 1, it is characterized in that: described powdered iron ore is the high grade iron breeze of Fe content 60 ~ 72%, more than granularity 100 orders.
3. the high reaction activity coke blending method used of blast furnace as claimed in claim 1 or 2, it is characterized in that: the cold strength index of the coke after finishing is JIS rotary drum DI
150 15(%) 〉=78, Micoud nurse rotary drum M
40(%) 〉=78, Micoud nurse rotary drum M
10(%)≤10.
4. the high reaction activity coke blending method used of blast furnace as claimed in claim 3, it is characterized in that: by weight percentage, the coking coal that participates in coal blending comprises Henan rich coal 25%, Canadian coking coal 25%, Shandong 1/3 coking coal 15%, Jiangsu bottle coal 25%, Shanxi lean coal 5% ~ 7%, powdered iron ore 3% ~ 5%, the cold strength index of the coke after coking is finished is JIS rotary drum DI
150 15(%) 85 ~ 87.5, Micoud nurse rotary drum M
40(%) 80 ~ 85, Micoud nurse rotary drum M
10(%) 5 ~ 8.
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| CN104140835A (en) * | 2014-07-15 | 2014-11-12 | 武汉钢铁(集团)公司 | Coal blending and coking method with high-expansion, low-shrinkage-degree and low-flow coking coal participating in |
| CN106929078A (en) * | 2015-12-21 | 2017-07-07 | 株式会社Posco | Melting gasification coke for furnace and the method for manufacturing the coke |
| CN106929078B (en) * | 2015-12-21 | 2020-01-31 | 株式会社Posco | Coke for melting gasifier and method for producing same |
| CN105802649A (en) * | 2016-05-04 | 2016-07-27 | 武汉钢铁股份有限公司 | Blending method of medium-volatile component low-expansion high-shrinkage coking coal |
| CN105802649B (en) * | 2016-05-04 | 2018-07-03 | 武汉钢铁有限公司 | A kind of middle volatile matter low bulk high convergency coking coal application method |
| CN108241001A (en) * | 2016-12-27 | 2018-07-03 | 华润水泥技术研发有限公司 | A kind of coal source tracing method |
| CN108753331A (en) * | 2018-06-06 | 2018-11-06 | 新兴铸管股份有限公司 | The blending method of tamping coke furnace |
| CN110272045A (en) * | 2019-07-20 | 2019-09-24 | 武钢集团昆明钢铁股份有限公司 | A kind of high activity coke and preparation method thereof |
| CN110272045B (en) * | 2019-07-20 | 2022-07-12 | 武钢集团昆明钢铁股份有限公司 | High-activity coke and preparation method thereof |
| CN110540849A (en) * | 2019-09-24 | 2019-12-06 | 上海茜昆实业发展有限公司 | Energy-saving and environment-friendly coke and preparation method thereof |
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