CN102455308A - 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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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 and use the lump coal performance test methods.
Background technology
COREX is typical two step method ironmaking technique of fusion and reduction; It is made up of melting gasification furnace and shaft furnace two parts; Utilize coal and oxygen in the melting gasification furnace bottom raceway burning supply with the metallurgical process heat; Iron ore pellets, lump ore are melted gasification furnace the continuous process that descends from the adding of reduction shaft furnace top and in shaft furnace reducing gas is reduced to sponge iron; This technology is developed by VAI, and 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 the raw material production molten iron.COREX technology directly use non-adhesive or a little less than close-burning lump coal, charing forms semicoke in the process of lump coal in melting gasification furnace, the skeleton function of coke during its alternative blast furnace is produced.
The behavior of lump coal in melting gasification furnace; It passes through screw feeder; The high furnace roof space of 8-10 rice is arranged approximately through drop, add and fall the material bed in the gasification furnace, lump coal goes into that furnace roof spacing high-temperature gas and fluidisation shape high-temperature dust heat lump coal in the stove decline process; This time in stage, short heating was little to the influence of lump coal, mainly was physical disturbance.Lump coal is fallen and is received to rise coal gas on furnace roof space combustion radiation heating and the bottom behind the material bed and heat; The coal gas that in material bed decline process, is risen continues heating; Progressively remove volatile matter and charing and become semicoke and coke, removing and being heated of this process medium-sized coal volatile matter produces thermal spalling destruction.When temperature reaches semicoke and CO
2The beginning temperature of reaction after, also with coal gas in CO
2Reaction (mainly be the spongy iron that does not reduce fully in the shaft furnace, the CO that in gasification furnace, forms in the further reduction process
2), receiving and dissolve to decrease reaction and destroy, the erosion damage of high temperature heating power and slag iron gets into the air port at last and circles round and distinguish the impact failure in the combustion process.The actual middle and lower part that is equivalent to blast furnace of COREX melting gasification furnace, just lump zone diminishes than 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 directly reduces with semicoke), carburizer, serve as ventilative and the skeleton of liquid thoroughly; Wherein the effect of skeleton is extremely important, and natural lump coal is inhomogeneous but very fine and close, and removing of volatile matter is complicated decomposition polymeric chemical reaction in the heating process; The polymerizing power of non-caking coal and weakly caking coal is generally relatively poor; Differential expansion simultaneously and contraction can cause the explosion efflorescence, so the lump coal charing is not still to keep block after becoming semicoke, if efflorescence seriously will inevitably influence the ventilative skeleton function that passes through liquid; If the physical strength of lump coal own is not high in addition, will breaking and Dusting after falling from furnace roof.
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, the weighing and 5 100cm that pack into
3In the crucible with cover, 850
Take out cooling behind 15 ℃ the muffle furnace heating 30min, weighing, screening, the percentage that accounts for residual burnt quality sums at different levels greater than the residual burnt quality of 6mm with granularity is as thermal stability index TS
+ 6The percentage that accounts for residual burnt quality sums at different levels with 3～6mm with greater than the residual burnt quality of 3mm is as thermal stability auxiliary characteristics TS
3-6, TS
-3
Present lump coal mechanical robustness testing method: getting the 5kg granularity is 20～31.5mm lump coal sample, and after 1/5 Micoud nurse rotary drum transfer 100 was changeed, screening was calculated more than the 10mm and accounted for the percent into the rotary drum amount below the 2mm, representes MS respectively
+ 10And MS
-2Other a kind of evaluation method of lump coal physical strength is shatter test, gets 2kg greater than 15mm lump coal sample, falls for 4 times through 5 meters, and screening is calculated less than the 6mm percentage.
Present lump coal heat stabilization test method: characteristic and the semicoke intensity of mainly estimating the lump coal coking; Test method is to produce 16～20mm test specimen with the lump coal sample; 1000 ℃ of fast charrings of test are 1 hour in muffle furnace; Carry out sizing analysis after the cooling, calculate respectively in the semicoke, be expressed as TS greater than 10mm with less than the 2mm percent content
+ 10And TS
-2Again semicoke is carried out I drum test (600 change), semicoke behind the rotary drum is carried out sizing analysis, calculate respectively in the semicoke, be expressed as TMS greater than 10mm with less than the 2mm percent content
+ 10And TMS
-2
There is drawback in coal separation to the test method of more than mentioning for COREX technology; Its property distinguished and bad of the lump coal heat stabilization test method of utilizing before fact table makes eye bright; The lump coal coupon results in several kinds of different cultivars and the place of production is the same basically; And its performance in melting gasification furnace of different lump coal is different certainly, and this is that irrationality by test method causes.
The muffle furnace amount of stored heat is little; Can impact temperature in the stove after adding coal cinder in the test; And the granularity of programming rate and coal sample plays a key effect to the result in test, and the lump coal granularity used of test at present is 16～20mm in addition, and goes into stove actual grain size 5～50mm and differs too big; The easier more greatly explosion of granularity is so existing test method can't correctly be estimated the actual application value of this lump coal in melting gasification furnace.
Summary of the invention
Technical matters to be solved by this invention provides a kind of melting gasification furnace with lump coal thermal decomposition test method; Testing coke oven, sample and the process of being selected for use in this test method can better be simulated the state of lump coal in the melting gasification furnace, and evaluation and selection coal are more scientific and reasonable when operation COREX technology.
The present invention is achieved in that a kind of melting gasification furnace with lump coal thermal decomposition test method, comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test;
One, sample is made in beginning earlier; Lump coal sample to be tested is sieved; Carry out classification with 6mm, 15mm, 25mm, 50mm, 75mm sieve respectively, weight at different levels in the record gained coal sample is chosen the above coal sample of 6mm grade; Calculate the ratio of each grade, will be made into the sample of 5～20kg then according to the ratio of above-mentioned grade greater than the coal sample more than the 6mm;
Two, carry out lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke respectively with sample then;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out sieving after the rotary drum test, write down weight at different levels respectively, calculate in the lump coal of rotary drum test back and be designated as MS greater than 10mm with less than the 3mm percent content
+ 10And MS
-3
Lump coal coking attribute testing: select large-scale coking test coke oven for use; This testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature; Get the sample that portion prepares and put into the iron case, the sample centre bit buries the heat release galvanic couple, with iron case shove charge coking; The charge of coke central temperature is discharged of the coke after reaching 900 ℃～1000 ℃, puts into the quenching of dry coke quenching case; Carry out sizing analysis after the cooling, calculate respectively in the gained semicoke, be expressed as TI greater than 10mm with less than the 3mm percent content
+ 10And TI
-3
Lump coal semicoke strength test: the semicoke that obtains after the lump coal coking attribute testing is carried out 1/4 Micoud nurse drum test, semicoke behind the rotary drum is carried out sizing analysis, calculate respectively in the semicoke, be expressed as MI greater than 10mm with less than the 3mm percent content
+ 10And MI
-3
Change during described 1/4 Micoud nurse drum test changeed in 4 minutes 100.
Described large-scale coking test coke oven is for adorning coal capcity greater than more than the 200kg, and the carbonization chamber width 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 the carbonization chamber width.
After reaching 950 ℃, described charge of coke central temperature discharges of the coke.
Melting gasification furnace of the present invention can better be simulated the state of lump coal in the melting gasification furnace with testing coke oven, sample and the process selected for use in the lump coal thermal decomposition test method; Can solve the problem of its property distinguished difference of heat stabilization test of present employing; Can select accurately and effectively and be fit to the lump coal kind that melting gasification furnace uses in the COREX technology; Enlarge the range of choice of COREX, reduce COREX technology ironmaking cost with lump coal.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to 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 institute restricted portion equally.
Embodiment
A kind of melting gasification furnace comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test with lump coal thermal decomposition test method;
One, sample is made in beginning earlier; Lump coal sample to be tested is sieved; Carry out classification with 6mm, 15mm, 25mm, 50mm, 75mm sieve respectively, weight at different levels in the record gained coal sample is chosen the above coal sample of 6mm grade; Calculate the ratio of each grade, will be made into the sample of 5～20kg then according to the ratio of above-mentioned grade greater than the coal sample more than the 6mm;
Two, carry out lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke respectively with sample then;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out sieving after the rotary drum test was changeed in 4 minutes 100, write down weight at different levels respectively, calculate in the lump coal of rotary drum test back and be designated as MS greater than 10mm with less than the 3mm percent content
+ 10And MS
-3
Lump coal coking attribute testing: select large-scale coking test coke oven for use; This testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature; As preferably in the present embodiment this testing coke oven keep constant temperature after being warmed up to 1050 ℃, get the sample that portion prepares and put into the iron case, the sample centre bit buries the heat release galvanic couple; With iron case shove charge coking; The charge of coke central temperature is discharged of the coke after reaching 900 ℃～1000 ℃, discharges of the coke after reaching 950 ℃ as the charge of coke central temperature described in the preferred present embodiment, puts into the quenching of dry coke quenching case then; Carry out sizing analysis after the cooling, greater than 10mm with less than the 3mm percent content, be expressed as TI in the difference gained calculating semicoke
+ 10And TI
-3
Lump coal semicoke strength test: the semicoke that obtains after the lump coal coking attribute testing is carried out 1/4 Micoud nurse drum test 4 minutes 100 change the back, calculate respectively in the semicoke, be expressed as MI greater than 10mm with less than the 3mm percent content to carrying out sizing analysis
+ 10And MI
-3
Described in the present embodiment large-scale coking test coke oven is for adorning coal capcity greater than more than the 200kg, and the carbonization chamber width is greater than 350mm, and useful volume is greater than 0.3m
3Above testing coke oven does not have influence to temperature in the stove after could guaranteeing like this to add sample, and sample size is confirmed according to the thermal power of testing coke oven; What need specify in addition is that described iron case width is less than the carbonization chamber width, conducts heat to guarantee sample main raying in pyrolytic process, receives hot mode similar with the melting gasification furnace medium-sized coal.
Below be the concrete result that the two kinds of lump coal in the prosperous village and Datong District are made an experiment respectively.Prosperous village lump coal is numbered RXL, and Datong District's lump coal is numbered RDT.Testing coke oven adopts 300kg electrical heating testing coke oven, and sample is selected 10kg for use, and testing coke oven is warmed up to 1050 ℃ and keep constant temperature, and the coking time is 2 hours, dry coke quenching.The experimental result of utilizing existing experimental technique to obtain is seen table 4; See that by table 4 the various experimental results of two kinds of coals are very close and all in admissible experimental error; So can't 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 that obtains in the actual production also conforms to test findings of the present invention.
Test condition is seen table 1.
Lump coal mechanical robustness testing result sees table 2
Lump coal coking attribute testing and lump coal semicoke strength test result see table 3
Claims (6)
1. a melting gasification furnace comprises lump coal mechanical robustness testing, lump coal coking attribute testing and three parts of lump coal semicoke strength test with lump coal thermal decomposition test method;
One, sample is made in beginning earlier; Lump coal sample to be tested is sieved; Carry out classification with 6mm, 15mm, 25mm, 50mm, 75mm sieve respectively, weight at different levels in the record gained coal sample is chosen the above coal sample of 6mm grade; Calculate the ratio of each grade, will be made into the sample of 5～20kg then according to the ratio of above-mentioned grade greater than the coal sample more than the 6mm;
Two, carry out lump coal mechanical robustness testing, lump coal coking attribute testing and the strength test of lump coal semicoke respectively with sample then;
Lump coal mechanical robustness testing: get sample that portion prepares and put into 1/4 Micoud nurse rotary drum and carry out sieving after the rotary drum test, write down weight at different levels respectively, calculate in the lump coal of rotary drum test back and be designated as MS greater than 10mm with less than the 3mm percent content
+ 10And MS
-3
Lump coal coking attribute testing: select large-scale coking test coke oven for use; This testing coke oven is warmed up to 1000 ℃～1100 ℃ and keep constant temperature; Get the sample that portion prepares and put into the iron case, the sample centre bit buries the heat release galvanic couple, with iron case shove charge coking; The charge of coke central temperature is discharged of the coke after reaching 900 ℃～1000 ℃, puts into the quenching of dry coke quenching case; Carry out sizing analysis after the cooling, calculate respectively in the gained semicoke, be expressed as TS greater than 10mm with less than the 3mm percent content
+ 10And TS
-3
Lump coal semicoke strength test: the semicoke that obtains after the lump coal coking attribute testing is carried out 1/4 Micoud nurse drum test, semicoke behind the rotary drum is carried out sizing analysis, calculate respectively in the semicoke, be expressed as MI greater than 10mm with less than the 3mm percent content
+ 10And MI
-3
2. melting gasification furnace as claimed in claim 1 is characterized in that with lump coal thermal decomposition test method: change during described 1/4 Micoud nurse drum test changeed in 4 minutes 100.
3. according to claim 1 or claim 2 melting gasification furnace is characterized in that with lump coal thermal decomposition test method: described large-scale coking test coke oven for the dress coal capcity greater than more than the 200kg, the carbonization chamber width is greater than 350mm, useful volume is greater than 0.3m
3Above testing coke oven.
4. melting gasification furnace as claimed in claim 3 is characterized in that with lump coal thermal decomposition test method: this testing coke oven is warmed up to 1050 ℃ and keep constant temperature.
5. melting gasification furnace as claimed in claim 3 is characterized in that with lump coal thermal decomposition test method: described iron case width is less than the carbonization chamber width.
6. melting gasification furnace as claimed in claim 3 is characterized in that with lump coal thermal decomposition test method: discharge of the coke after described charge of coke central temperature reaches 950 ℃.
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Cited By (9)
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| CN103293177A (en) * | 2013-06-09 | 2013-09-11 | 中国科学院山西煤炭化学研究所 | Quick heating and gasifying test device and application thereof |
| CN103398918A (en) * | 2013-07-29 | 2013-11-20 | 重庆大学 | Method and device for testing thermal property of semicokes generated by cracking of block coal |
| CN107641675A (en) * | 2017-08-11 | 2018-01-30 | 武汉科技大学 | A kind of method for drafting of COREX gasification furnaces fuel metallurgical performance evolution |
| CN110045082A (en) * | 2019-04-22 | 2019-07-23 | 西安建筑科技大学 | A kind of measurement evaluation method of fused reduction iron-smelting medium sized coal high-temperature behavior |
| 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 |
| CN112730038A (en) * | 2021-01-29 | 2021-04-30 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | Method for measuring mechanical strength of semi-coke for producing ferrosilicon |
| CN113848231A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Coking property judgment method based on thermal diffusivity in coking coal pyrolysis process |
| CN115141639A (en) * | 2021-03-28 | 2022-10-04 | 上海梅山钢铁股份有限公司 | Sample arrangement device and method for coke dry quenching tank |
| 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 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN107641675A (en) * | 2017-08-11 | 2018-01-30 | 武汉科技大学 | A kind of method for drafting of COREX gasification furnaces 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 |
| CN110045082A (en) * | 2019-04-22 | 2019-07-23 | 西安建筑科技大学 | A kind of measurement evaluation method of fused reduction iron-smelting medium sized coal high-temperature behavior |
| 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 |
| CN113848231A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Coking property judgment method based on thermal diffusivity in coking coal pyrolysis process |
| 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 |
| CN112730038A (en) * | 2021-01-29 | 2021-04-30 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | Method for measuring mechanical strength of semi-coke for producing ferrosilicon |
| 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 |
| CN115141639A (en) * | 2021-03-28 | 2022-10-04 | 上海梅山钢铁股份有限公司 | Sample arrangement device and method for coke dry quenching tank |
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