CN102455308B - Lump coal pyrolysis experimental method for melting gasification furnace - Google Patents
Lump coal pyrolysis experimental method for melting gasification furnace Download PDFInfo
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- CN102455308B CN102455308B CN201010522449.6A CN201010522449A CN102455308B CN 102455308 B CN102455308 B CN 102455308B CN 201010522449 A CN201010522449 A CN 201010522449A CN 102455308 B CN102455308 B CN 102455308B
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Abstract
The invention belongs to the field of test of lump coal properties and particularly relates to a lump coal property test method for a melting gasification furnace. A lump coal pyrolysis experimental method for the melting gasification furnace comprises three steps, namely lump coal mechanical strength experiment, lump coal coking characteristic experiment and lump coal semicoking strength experiment; a coal sample with the particle size of over 6 millimeters is used as a sample and prepared into 5 to 20 kilograms of samples; and a large-sized coking experiment coke furnace is used. In the lump coal pyrolysis experimental method for the melting gasification furnace, the experiment coke furnace, the sample and the process can better simulate states of lump coals in the melting gasification furnace, so that the problem of low discrimination of the conventional heat stability experiment can be solved; furthermore, the lump coal species for the melting gasification furnace, which are suitable for a COREX process can be selected accurately and effectively, the selection range of the lump coals for the COREX is expanded, and the iron-making cost of the COREX process is reduced.
Description
Technical field
The invention belongs to lump coal performance test field, particularly relate to a kind of melting gasification furnace lump coal performance test methods.
Background technology
COREX is typical two step method ironmaking technique of fusion and reduction, it is comprised of melting gasification furnace and shaft furnace two parts, utilize coal and oxygen to supply with metallurgical process heat in the burning of melting gasification furnace bottom raceway, iron ore pellets, lump ore from reduction shaft furnace top add and the process that constantly declines in shaft furnace be melted gasification furnace reducing gas be reduced to sponge iron, this technique is developed by VAI, different with the traditional blast furnace technology based on coking coal, it can directly use non-coking coal, natural lump ore and pelletizing to make raw material and produce molten iron.COREX technique is directly used non-adhesive or weak close-burning lump coal, and in the process of lump coal in melting gasification furnace, charing forms semicoke, the skeleton function of coke in its alternative blast furnace production.
The behavior of lump coal in melting gasification furnace, it passes through screw feeder, through drop, approximately there is the furnace roof space that 8-10 rice is high, add in gasification furnace and fall and expect bed, lump coal enters furnace roof spacing high-temperature gas and fluidisation shape high-temperature dust in stove decline process lump coal is heated, the short heating of this phases-time is little on the impact of lump coal, is mainly physical disturbance.Lump coal is subject to rise heated by gas on furnace roof space combustion radiation heating and bottom after falling material bed, the coal gas being risen in material bed decline process continues heating, progressively devolatilization charing become semicoke and coke, and removing and being heated of this process medium-sized coal volatile matter produces thermal spalling destruction.When temperature reaches semicoke and CO
2beginning temperature of reaction after, also with coal gas in CO
2reaction (be mainly the spongy iron not reducing completely in shaft furnace, the CO forming in further reduction process in gasification furnace
2), being subject to molten damage reaction and destroying, the erosion damage of high temperature heating power and slag iron, finally enters the impact failure in convolution district, air port combustion process.The actual middle and lower part that is equivalent to blast furnace of COREX melting gasification furnace, just lump zone diminishes compared with the lump zone height of blast furnace.According to technological requirement, lump coal should have four effects greatly at melting gasification furnace: exothermic mixture (burning provides heat), reductive agent (volatile matter produces reducing gas and semicoke direct-reduction), carburizer, the skeleton that serves as ventilative and saturating liquid, wherein the effect of skeleton is extremely important, natural lump coal is inhomogeneous but very fine and close, in heating process, removing of volatile matter is complicated decomposition polymeric chemical reaction, the polymerizing power of non-caking coal and weakly caking coal is generally poor, differential expansion simultaneously and contraction can cause explosion efflorescence, so lump coal charing becomes the half defocused bulk that not still keeps, if efflorescence seriously will inevitably affect the skeleton function of ventilative saturating liquid, if the physical strength of lump coal own is not high in addition, will breaking and Dusting from furnace roof falls.
The thermal stability determination method of GB GB1573-89 coal: this standard is applicable to the thermal stability determination of brown coal, stone coal and incoherence bituminous coal.Measure the about 500cm of coal sample of 6～13mm granularity
3, weigh and pack 5 100cm into
3in crucible with cover, 850
after the muffle furnace heating 30min of 15 ℃, take out coolingly, weigh, screening, the granularity of usining is greater than percentage that the residual burnt quality of 6mm accounts for residual burnt quality sums at different levels as thermal stability index TS
+ 6; Using 3～6mm and be greater than percentage that the residual burnt quality of 3mm accounts for residual burnt quality sums at different levels as thermal stability auxiliary characteristics TS
3-6, TS
-3.
Current lump coal mechanical robustness testing method: getting 5kg granularity is 20～31.5mm lump coal sample, after 1/5 Micoud nurse rotary drum transfer 100 turns, screening is calculated 10mm above and 2mm accounts for the percent into rotary drum amount below, represents respectively MS
+ 10and MS
-2.Another evaluation method of lump coal physical strength is shatter test, gets 2kg and is greater than 15mm lump coal sample, falls for 4 times through 5 meters, and screening is calculated and is less than 6mm percentage.
Current lump coal heat stabilization test method: characteristic and the semicoke intensity of mainly evaluating lump coal coking, test method is to produce 16～20mm test specimen with lump coal sample, in muffle furnace, test 1000 ℃ of fast charrings 1 hour, after cooling, carry out sizing analysis, calculate respectively in semicoke and be greater than 10mm and be less than 2mm percent content, be expressed as TS
+ 10and TS
-2.Again semicoke is carried out to I drum test (600 turn), semicoke after rotary drum is carried out to sizing analysis, calculate respectively in semicoke and be greater than 10mm and be less than 2mm percent content, be expressed as TMS
+ 10and TMS
-2.
For COREX technique there is drawback in coal separation to above-mentioned test method, its property distinguished bad of the lump coal heat stabilization test method of utilizing before fact table improving eyesight, the lump coal coupon results in several different cultivars and the place of production is substantially the same, and its performance in melting gasification furnace of different lump coal is different certainly, this is that irrationality by test method causes.
Muffle furnace amount of stored heat is little, after adding coal cinder in test, can impact temperature in stove, and the granularity of programming rate and coal sample plays a key effect to result in test, the lump coal granularity of testing at present in addition use is 16～20mm, with enter stove actual grain size 5～50mm and differ too large, the easier more greatly explosion of granularity, so existing test method cannot correctly be evaluated the actual application value of this lump coal in melting gasification furnace.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of lump coal pyrolysis experimental method for melting gasification furnace, in this test method, selected testing coke oven, sample and process can better be simulated the state of lump coal in melting gasification furnace, evaluates and select coal more scientific rationally when operation COREX technique.
The present invention is achieved in that a kind of lump coal pyrolysis experimental method for melting gasification furnace, comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test;
One, start first to make sample, lump coal sample to be tested is sieved, with 6mm, 15mm, 25mm, 50mm, 75mm sieve, carry out classification respectively, record weight at different levels in gained coal sample, choose coal sample more than 6mm grade, calculate the ratio of each grade, then the coal sample being greater than more than 6mm is made into the sample of 5～20kg according to the ratio of above-mentioned grade;
Two, then with sample, carry out respectively lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out sieving after rotary drum test, record respectively weight at different levels, calculate to be greater than 10mm and to be less than 3mm percent content in lump coal after rotary drum test and be designated as MS
+ 10and MS
-3;
Lump coal coking attribute testing: select large-scale coking test coke oven, this testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature, get the sample that portion prepares and put into iron case, sample centre bit buries heat release galvanic couple, with iron case shove charge coking, Center Temperature of Coke Cake discharges of the coke after reaching 900 ℃～1000 ℃, puts into the quenching of dry coke quenching case; After cooling, carry out sizing analysis, calculate respectively in gained semicoke and be greater than 10mm and be less than 3mm percent content, be expressed as TI
+ 10and TI
-3;
Lump coal semicoke strength test: the semicoke obtaining after lump coal coking attribute testing is carried out to 1/4 Micoud nurse drum test, semicoke after rotary drum is carried out to sizing analysis, calculate respectively in semicoke and be greater than 10mm and be less than 3mm percent content, be expressed as MI
+ 10and MI
-3.
During described 1/4 Micoud nurse drum test, turning 4 minutes 100 turns.
Described large-scale coking test coke oven is that more than dress coal capcity is greater than 200kg, width of charring chamber is greater than 350mm, and useful volume is greater than 0.3m
3above testing coke oven.
This testing coke oven is warmed up to 1050 ℃ and keep constant temperature.
Described iron case width is less than width of charring chamber.
Described Center Temperature of Coke Cake discharges of the coke after reaching 950 ℃.
In lump coal pyrolysis experimental method for melting gasification furnace of the present invention, selected testing coke oven, sample and process can better be simulated the state of lump coal in melting gasification furnace, can solve the poor problem of its property distinguished of heat stabilization test of current employing, can select accurately and effectively and be applicable to the lump coal kind that in COREX technique, melting gasification furnace is used, expand the range of choice of lump coal for COREX, reduce COREX technique ironmaking cost.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's statement, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment
A lump coal pyrolysis experimental method for melting gasification furnace, comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test;
One, start first to make sample, lump coal sample to be tested is sieved, with 6mm, 15mm, 25mm, 50mm, 75mm sieve, carry out classification respectively, record weight at different levels in gained coal sample, choose coal sample more than 6mm grade, calculate the ratio of each grade, then the coal sample being greater than more than 6mm is made into the sample of 5～20kg according to the ratio of above-mentioned grade;
Two, then with sample, carry out respectively lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out after rotary drum test turns for 4 minutes 100 sieving, record respectively weight at different levels, calculate to be greater than 10mm and to be less than 3mm percent content in lump coal after rotary drum test and be designated as MS
+ 10and MS
-3;
Lump coal coking attribute testing: select large-scale coking test coke oven, this testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature, as preferably in the present embodiment this testing coke oven after being warmed up to 1050 ℃, keep constant temperature, get the sample that portion prepares and put into iron case, sample centre bit buries heat release galvanic couple, with iron case shove charge coking, Center Temperature of Coke Cake discharges of the coke after reaching 900 ℃～1000 ℃, after reaching 950 ℃ as the Center Temperature of Coke Cake described in preferred the present embodiment, discharge of the coke, then put into the quenching of dry coke quenching case; After cooling, carry out sizing analysis, gained calculates in semicoke and is greater than 10mm and is less than 3mm percent content respectively, is expressed as TI
+ 10and TI
-3;
Lump coal semicoke strength test: the semicoke obtaining after lump coal coking attribute testing is carried out to 1/4 Micoud nurse drum test and turn rear to carrying out sizing analysis for 4 minutes 100, calculate respectively in semicoke and be greater than 10mm and be less than 3mm percent content, be expressed as MI
+ 10and MI
-3.
Described large-scale coking test coke oven is that more than dress coal capcity is greater than 200kg, width of charring chamber is greater than 350mm in the present embodiment, and useful volume is greater than 0.3m
3above testing coke oven, guarantee adds after sample temperature in stove without impact like this, and sample size is determined according to the thermal power of testing coke oven; It should be noted that in addition described iron case width is less than width of charring chamber, to guarantee sample main raying heat transfer in pyrolytic process, be subject to hot mode similar to melting gasification furnace medium-sized coal.
It is below the concrete result that Xinglongzhuang and two kinds of Datong District lump coal are tested respectively.Xinglongzhuang lump coal is numbered RXL, and Datong District's lump coal is numbered RDT.Testing coke oven adopts 300kg electric-heating testing coke oven, and sample is selected 10kg, and testing coke oven is warmed up to 1050 ℃ and keep constant temperature, and the coking time is 2 hours, dry coke quenching.Utilize experimental result that existing experimental technique obtains in Table 4, by table 4, see that the various experimental results of two kinds of coals are very close and all in admissible experimental error, so cannot judge quality, and the test method that adopts the present invention to propose just can be better than RDT by discovery RXL clearly, and the conclusion obtaining in actual production also conforms to test findings of the present invention.
Test condition is in Table 1.
Lump coal mechanical robustness testing the results are shown in Table 2
Lump coal coking attribute testing and the strength test of lump coal semicoke the results are shown in Table 3
Claims (5)
1. a lump coal pyrolysis experimental method for melting gasification furnace, comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test;
One, start first to make sample, lump coal sample to be tested is sieved, with 6mm, 15mm, 25mm, 50mm, 75mm sieve, carry out classification respectively, record weight at different levels in gained coal sample, choose coal sample more than 6mm grade, calculate the ratio of each grade, then the coal sample that is greater than 6mm is made into the sample of 5～20kg according to the ratio of above-mentioned grade;
Two, then with sample, carry out respectively lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out sieving after rotary drum test, record respectively weight at different levels, calculate after rotary drum test and be greater than 10mm and be less than 3mm percent content in lump coal, be designated as MS
+ 10and MS
-3;
Lump coal coking attribute testing: select large-scale coking test coke oven, this testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature, get the sample that portion prepares and put into iron case, described iron case width is less than the width of charring chamber of this testing coke oven, sample centre bit buries heat release galvanic couple, with iron case shove charge coking, Center Temperature of Coke Cake discharges of the coke after reaching 900 ℃～1000 ℃, puts into the quenching of dry coke quenching case; After cooling, carry out sizing analysis, calculate respectively in gained semicoke and be greater than 10mm and be less than 3mm percent content, be expressed as TS
+ 10and TS
-3;
Lump coal semicoke strength test: the semicoke obtaining after lump coal coking attribute testing is carried out to 1/4 Micoud nurse drum test, semicoke after rotary drum is carried out to sizing analysis, calculate respectively in semicoke and be greater than 10mm and be less than 3mm percent content, be expressed as MI
+ 10and MI
-3.
2. lump coal pyrolysis experimental method for melting gasification furnace as claimed in claim 1, is characterized in that: during described 1/4 Micoud nurse drum test, turn 4 minutes 100 and turn.
3. lump coal pyrolysis experimental method for melting gasification furnace as claimed in claim 1 or 2, is characterized in that: described large-scale coking test coke oven is greater than 200kg for filling coal capcity, and width of charring chamber is greater than 350mm, and useful volume is greater than 0.3m
3testing coke oven.
4. lump coal pyrolysis experimental method for melting gasification furnace as claimed in claim 3, is characterized in that: this testing coke oven is warmed up to 1050 ℃ and keep constant temperature.
5. lump coal pyrolysis experimental method for melting gasification furnace as claimed in claim 3, is characterized in that: described Center Temperature of Coke Cake discharges of the coke after reaching 950 ℃.
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| CN102455308B true CN102455308B (en) | 2014-03-19 |
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| CN103293177B (en) * | 2013-06-09 | 2015-03-25 | 中国科学院山西煤炭化学研究所 | Quick heating and gasifying test device and application thereof |
| CN103398918B (en) * | 2013-07-29 | 2015-06-03 | 重庆大学 | Method and device for testing thermal property of semicokes generated by cracking of block coal |
| CN107641675B (en) * | 2017-08-11 | 2019-03-05 | 武汉科技大学 | A kind of method for drafting of COREX gasification furnace fuel metallurgical performance evolution |
| CN110045082B (en) * | 2019-04-22 | 2021-11-09 | 西安建筑科技大学 | Method for measuring and evaluating high-temperature performance of lump coal in smelting reduction iron making |
| CN110257087A (en) * | 2019-06-25 | 2019-09-20 | 包头钢铁（集团）有限责任公司 | A kind of 40Kg testing coke oven heating control technique |
| CN113804567B (en) * | 2020-06-15 | 2023-11-14 | 宝山钢铁股份有限公司 | Intensity evaluation method for desulfurization and denitrification granular activated carbon |
| CN113848231B (en) * | 2020-06-28 | 2024-03-08 | 宝山钢铁股份有限公司 | Coking property judging method based on thermal diffusivity in coking coal pyrolysis process |
| CN112730038B (en) * | 2021-01-29 | 2023-08-18 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | Determination method of mechanical strength of semi-coke for ferrosilicon production |
| CN115141639B (en) * | 2021-03-28 | 2024-06-04 | 上海梅山钢铁股份有限公司 | Sample arranging device and method for coke dry quenching tank |
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