CN201561645U - First slag experimental furnace - Google Patents
First slag experimental furnace Download PDFInfo
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- CN201561645U CN201561645U CN200920230001XU CN200920230001U CN201561645U CN 201561645 U CN201561645 U CN 201561645U CN 200920230001X U CN200920230001X U CN 200920230001XU CN 200920230001 U CN200920230001 U CN 200920230001U CN 201561645 U CN201561645 U CN 201561645U
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Abstract
The utility model relates to a first slag experimental furnace, which solves the problem that a current blast furnace can not directly obtain and analyze first slag. The utility model adopts the technical scheme that the first slag experimental furnace comprises an electric furnace with a furnace tube and a gas distribution cabinet, and is characterized in that a graphite crucible positioned on a graphite base is arranged in the furnace tube; a central pressure lever is arranged at the upper end of the graphite crucible; the upper end of the central pressure lever penetrates through the furnace tube; a thermoelectric couple is arranged at the upper end of the central pressure lever in an insertion way; a charge level weight adjusting device is arranged on the central pressure lever; an upper cover, an exhaust opening and a displacement sensor are arranged at the upper end of the furnace tube; a material receiving box is arranged at the lower end of the furnace tube and communicated with the gas distribution cabinet through a reducing gas inlet; and a pressure difference transmitter is arranged on a connecting pipeline between reducing gas inlet and the gas distribution cabinet. The first slag experimental furnace can simulate blast furnace condition to directly obtain first slag, and can better simulate the blast furnace condition, thereby achieving the purpose of guiding the optimization of burden structure.
Description
Technical field
The utility model relates to a kind of experimental furnace of blast furnace smelting governance industry, and concrete is a kind of first slag experimental furnace.
Background technology
The formation of slag experience drippage first slag, bosh first slag, air port slag, finishing slag are total to four-stage in the blast furnace.Drippage first slag and bosh first slag can be referred to as " first slagging " again or abbreviate " first slag " as.The characteristics of first slag forming process characterize with beginning softening temperature, the indexs such as gas permeability that begin to drip temperature, ore layer usually.The beginning softening temperature of generally wishing ore is high, and soft heat interval (beginning to drip the difference of temperature and beginning softening temperature) is narrow, and gas permeability will be got well, and is beneficial to the strengthening smelting of blast furnace.So-called blast furnace burden structure means the kind and the proportioning thereof of the iron ore of packing into from the blast furnace furnace roof, and the forming process and the burden structure of first slag have substantial connection.
Pulverized coal injection in blast furnace helps reducing pig iron cost, reduces coke ratio, alleviates the pressure to environment and high-quality caking coal resource.Enlarging injecting coal quantity is the eternal pursuit of China blast furnace enterprise.Large social discarded object such as Injecting Plastic Scrap into BF, damaged tire, used oil and natural gas, water-coal-slurry etc. not only help reducing coke ratio, and increase the H in the coal gas
2Concentration is improved the reduction of iron ore and is reduced CO
2Discharging helps improving environment.But injection materials such as coal dust can not completing combustion before blast-furnace tuyere, the height of combustion rate and injection material kind and winding-up amount, and wind-warm syndrome, oxygen enrichment percentage, the air blast condition of grading of wetting are closely related.Combustion rate is low more, the winding-up amount is big more, and generation and the unburning material that is involved in by first slag are just many more.In general, high more its flowability of the content of unburning material is poor more in the first slag, and the first slag that different burden structure generates has nothing in common with each other to the sensitivity of unburning material.Therefore, the first slag analysis has important directive significance for optimizing burden structure.
At present, the research to the blast furnace slag performance both at home and abroad is generally limited to finishing slag, and is to the first slag forming process, particularly very few to the first slag performance study under a large amount of coal powder injections and other auxiliary fuel conditions.This mainly is because blast furnace is a kind of high-temperature reactor of sealing, no matter be difficult to directly gather the sample of first slagging and it is studied, be to produce on the blast furnace, still carries out the molten drop test of slagging just on traditional experiment blast furnace, expense is all very expensive, and the result is also undesirable.Therefore, be badly in need of a kind of simple and easy to do, experimental furnace that reliable results can reflect high furnace interior phenomenon again more truly.
Summary of the invention
The utility model is intended to propose the first slag hearth that a kind of analog blast furnace condition can be obtained first slag, and energy is the analog blast furnace condition well, and can directly gather first slag to its research that experimentizes.
The utility model first slag experimental furnace, comprise the electric furnace and the distribution cabinet that are provided with furnace tube, be provided with the graphite crucible that is positioned on the graphite base in the described furnace tube, the graphite crucible upper end is provided with the center depression bar, depression bar upper end, described center is passed furnace tube and is inserted with thermocouple, establish charge level loading adjusting device on the depression bar of center, described furnace tube upper end is established loam cake and is established exhaust outlet and displacement transducer, the lower end is established pulp-collecting box and is communicated with the distribution cabinet by the reducing gas import, establishes pressure difference transmitter on the connecting line of described reducing gas import and distribution cabinet.
Described exhaust outlet is connected with mass spectrograph through breather pipe.
Also be provided with the photoelectric sensor that is used to respond to the sample dropping on the described pulp-collecting box.
Described charge level loading adjusting device is a hydraulic cylinder.
Sample places the graphite crucible in the furnace tube, is compressed by the center depression bar, and described charge level loading presses down adjusting by charge level loading adjusting device control centre depression bar.The distribution cabinet is communicated with the reducing gas import through pressure difference transmitter, can feed reducing gas and specimen reaction, also can feed N before and after reaction
2Gas shiled, thermocouple is inserted by center depression bar upper end, is used to detect charge level temperature.The first slag (being dropping) of sample fusing can be dropped in the pulp-collecting box by graphite crucible and stool.
The inventor has scrutinized the forming process and the condition of first slag in the blast furnace, designed the first slag experimental furnace especially, solved the problem that existing blast furnace can't directly obtain first slag and first slag be analyzed and researched, the analog blast furnace condition heats up in the first slag experimental furnace, regulate gas composition and loading, can collect the first slag of drippage, first slag is carried out chemical analysis and microcosmic detection, and further utilize first slag to prepare the slag sample, and detect its fusing point, flow freely temperature and viscosity, thereby can study the injection material kind, winding-up amounts etc. are further instructed the optimization of blast furnace burden structure to the influence of bosh first slag flowability.
Beneficial effect:
1, utilize the first slag experimental furnace, by the first slag that the analog blast furnace condition can obtain to drip, solved present various experimental technique and all can't obtain first slag, thus the problem that can't study first slag.
2, the utility model first slag experimental furnace aims at and obtains first slag and design, and relatively large experiment blast furnace compares that it is simple in structure, cost of manufacture is low, helps carrying out the first experimental study of slagging of blast furnace with lower cost.
3, the control hydraulic cylinder is adjusted the charge level loading automatically, utilizes photoelectric sensor to respond to the first slag drippage automatically, and is safer, accurate, reliable.
4, the analysis result that employing first slag experimental furnace obtains first slag for the blast furnace burden structure is instructed in optimization, thereby enlarges winding-up amount, reduction coke ratio and pig iron cost more near blast furnace reality, reduces CO
2Discharging, alleviating blast furnace provides reliable basis to the load of environment.
Description of drawings
Fig. 1 is the structural representation of first slag experimental furnace.
Wherein, 1-distribution cabinet, 2-differential pressure transmitter, 3-bracing frame, 4-electric furnace, the import of 5-reducing gas, 6-pulp-collecting box, 7-photoelectric sensor, 8-graphite base, 9-sample, 10-black-fead crucible, 11-furnace tube, 12-center depression bar, 13-loam cake, 14-exhaust outlet, 15-displacement transducer, 16-hydraulic cylinder, 17-thermocouple, 18-breather pipe, 19-mass spectrograph.
The specific embodiment
Below in conjunction with accompanying drawing the utility model first slag experimental furnace is further explained explanation:
With reference to Fig. 1, comprise the electric furnace that is provided with furnace tube 11 4 and the distribution cabinet 1 that are installed on the bracing frame 3, be provided with the graphite crucible 10 that is positioned on the graphite base 8 in the described furnace tube 11, graphite crucible 10 upper ends are provided with center depression bar 12, depression bar 12 upper ends, described center are passed furnace tube 11 and are inserted with thermocouple 17, center depression bar 12 in the furnace tube 11 is connected with hydraulic cylinder 16, described furnace tube 11 upper ends are established loam cake 13 and are established exhaust outlet 14 and displacement transducer 15, pulp-collecting box 6 is established in the lower end, and be connected with reducing gas import 5 and be communicated with distribution cabinet 1, establish pressure difference transmitter 2 on the connecting line of described reducing gas import 5 and distribution cabinet 1.Described exhaust outlet 14 is connected with mass spectrograph 19 through breather pipe 18.Also be provided with the photoelectric sensor 7 that is used to respond to the sample dropping on the described pulp-collecting box 6.
Just the burner hearth of slag hearth is along periphery dress U type Si-Mo rod heater element, and Si-Mo rod generates heat and heat supply in furnace tube under the voltage effect, and the intelligent temperature control instrument of utilizing switch board to be equipped with heats up according to the assigned temperature control electric furnace that preestablishes each section period planted agent arrival.
Experimental technique:
Sample is prepared
Prepared 8 kinds of burden structures according to following scheme and experimentized as sample respectively, percentage is mass percent:
(1) 100% acidic pellet ore
(2) 100% Australian lump ores
(3) sintering deposit 75%, pellet 15%, 5% Australia ore deposit, 5% Hai Nankuang
(4) sintering deposit 65%, pellet 25%, 5% Australia ore deposit, 5% Hai Nankuang
(5) sintering deposit 55%, pellet 35%, 5% Australia ore deposit, 5% Hai Nankuang
(6) sintering deposit 45%, pellet 45%, 5% Australia ore deposit, 5% Hai Nankuang
(7) sintering deposit 35%, pellet 55%, 5% Australia ore deposit, 5% Hai Nankuang
(8) 100% high basicity sinters
Experiment condition is
Method
(1) earlier the granule coke of granularity 10～12mm is spread into graphite crucible 9 bottoms, it is 20mm that thickness is gone in the shop, claims that again granularity is that the 800 gram samples 9 of 6.3-10mm are packed in the graphite crucible 10 high about 100mm into.Repave one deck coke on sample 9 tops, it is 20mm that 1～10% hydrogen thickness is gone in the shop, compresses center depression bar 12, and covers loam cake 13 completely, inserts good thermocouple 17, and installs displacement transducer 15;
(2) energising is formulated heating schedule control first slag experimental furnace and is heated up, temperature in thermocouple 17 induction furnaces, logical N when furnace temperature reaches 500 ℃
2Gas shiled changes logical 1～10% volume H that contains after being warming up to 900 ℃
2Reducing gas and specimen reaction, and light exhaust outlet coal gas, the temperature of sample charge level is 900-1550 ℃.
(3) measure the pressure difference of gases with thermocouple 17 mensuration sample charge level temperatures, displacement transducer 15 mensuration stock column displacements, differential pressure transmitter 2 by stock column, with gas (the being coal gas) composition and the Computer Analysis that veers away after the reduction of mass spectrograph 19 on-line analysis exhaust outlets 14 discharges, sample 9 be heated, in the process of pressurized, reduction, weightless, softening and fusing will take place, drip at last, collect the first slag that fusing is dripped with pulp-collecting box 6, simultaneously with photoelectric sensor 7 induction alarms and record drippage temperature.
(4) stop reducing gas behind 3～4 droppings of collection, change logical N
2Protection; cut off the electricity supply; by obtaining first slag after pulp-collecting box 6 dischargings and analyzing its chemical analysis and carry out the microcosmic detection; according to every data that above-mentioned detection obtains, computer calculate automatically the softening beginning temperature of sample, softening end temp, fusing drippage temperature, softening temperature interval, reflowing temperature interval, pressure reduction integrated value, high-temperature reductibility, directly reduction degree, indirect reduction degree etc. characterize blast furnace ferrous furnace charge metallurgical performance and just slagging form the various indexes of characteristics.
(5) with the first slag of above-mentioned drippage as basic slag with addition of unburned pulverized coal preparation slag sample, their fusing point of measuring afterwards, flow freely temperature and viscosity, wherein, the proportioning of described unburned coal powder is calculated as follows:
U
b＝Q(1-η)(1-U
a)(1-U
c) (1)
A
c＝0.5QηA
d (2)
More than in two formulas, U
bBe the unburned coal dust amount that the blast furnace first slag is involved in, kg/t iron; Q is an injecting coal quantity, kg/t iron; η is a coal combustion rate before the air port; U
aFor the percentage of the unburned coal powder that enters the blast furnace finishing slag, get 40-70 quality %; U
cFor participating in the unburned coal powder amount of direct reduction and gasification reaction, get 40-70 quality %; A
cFor with coal dust that the blast furnace first slag contacts in ash amount, kg/t iron; A
dBe content of ashes in institute's coal injection, quality %.In the present embodiment, than 180kg/t iron, 60 quality %, 70 quality %, 80 quality % and four kinds of coal combustion rates of 100 quality % calculate has determined the proportioning of unburned coal powder in the first slagging and the proportioning of coal ash according to coal.
By the various parameters relevant with first slag having been carried out analyze relatively, find when pellet ratio when 15% is increased to 25% and 35%, FeO content in the first slag reduces, between the softened zone and soft heat interval narrows down, the air permeance resistance index slightly increases, and when identical not coal-fired content, increase pellet ratio, first slag flow freely temperature and fusing point descends.Confirm that thus for a large amount of coal powder injection blast furnaces, within the specific limits, it is very favourable to improving first slag flowability and heat endurance suitably to increase pellet ratio.According to the above analysis-by-synthesis that the relevant various parameters of first slag are carried out, make following burden structure prioritization scheme: natural lump ore proportioning 10% (being Australia ore deposit and Hai Nankuang), pellet ratio are 25%～35%, the high basicity sinter proportioning is 65%～55%.
Claims (4)
1. first slag experimental furnace, comprise the electric furnace and the distribution cabinet that are provided with furnace tube, it is characterized in that, be provided with the graphite crucible that is positioned on the graphite base in the described furnace tube, the graphite crucible upper end is provided with the center depression bar, depression bar upper end, described center is passed furnace tube and is inserted with thermocouple, establish charge level loading adjusting device on the depression bar of center, described furnace tube upper end is established loam cake and is established exhaust outlet and displacement transducer, the lower end is established pulp-collecting box and is communicated with the distribution cabinet by the reducing gas import, establishes pressure difference transmitter on the connecting line of described reducing gas import and distribution cabinet.
2. first slag experimental furnace as claimed in claim 1 is characterized in that described exhaust outlet is connected with mass spectrograph through breather pipe.
3. first slag experimental furnace as claimed in claim 1 is characterized in that, also is provided with the photoelectric sensor that is used to respond to sample drippage first slag on the described pulp-collecting box.
4. first slag experimental furnace as claimed in claim 1 is characterized in that, described charge level loading adjusting device is a hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920230001XU CN201561645U (en) | 2009-11-19 | 2009-11-19 | First slag experimental furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920230001XU CN201561645U (en) | 2009-11-19 | 2009-11-19 | First slag experimental furnace |
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| CN201561645U true CN201561645U (en) | 2010-08-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183449A (en) * | 2011-03-17 | 2011-09-14 | 北京科技大学 | Method for measuring permeability index of front coke or carbocoal of COREX or blast-furnace tuyere |
| CN103134337A (en) * | 2011-11-25 | 2013-06-05 | 曹永锋 | Automatic temperature-control type fixation point furnace and method achieving temperature plateau by using the same |
| CN104316439A (en) * | 2014-10-28 | 2015-01-28 | 东北大学 | Device and method for determining rheological properties of high-temperature metallurgy molten slag |
| CN105136614A (en) * | 2015-10-14 | 2015-12-09 | 东北大学 | Device and method for measuring electrorheological characteristic of slag containing titanium |
| CN105627752A (en) * | 2016-03-09 | 2016-06-01 | 镇江新航精密铸造有限公司 | Variation-analysis electric furnace |
| CN107543777A (en) * | 2017-10-11 | 2018-01-05 | 辽宁科技大学 | The test device and method of blast furnace ferrous furnace charge soft melting dropping characteristic |
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2009
- 2009-11-19 CN CN200920230001XU patent/CN201561645U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183449A (en) * | 2011-03-17 | 2011-09-14 | 北京科技大学 | Method for measuring permeability index of front coke or carbocoal of COREX or blast-furnace tuyere |
| CN103134337A (en) * | 2011-11-25 | 2013-06-05 | 曹永锋 | Automatic temperature-control type fixation point furnace and method achieving temperature plateau by using the same |
| CN103134337B (en) * | 2011-11-25 | 2016-03-09 | 曹永锋 | Automatic-temperature-control fixed-point furnace is used to generate the method for Wen Ping |
| CN104316439A (en) * | 2014-10-28 | 2015-01-28 | 东北大学 | Device and method for determining rheological properties of high-temperature metallurgy molten slag |
| CN105136614A (en) * | 2015-10-14 | 2015-12-09 | 东北大学 | Device and method for measuring electrorheological characteristic of slag containing titanium |
| CN105627752A (en) * | 2016-03-09 | 2016-06-01 | 镇江新航精密铸造有限公司 | Variation-analysis electric furnace |
| CN105627752B (en) * | 2016-03-09 | 2019-02-12 | 镇江新航精密铸造有限公司 | A kind of variance analysis electric furnace |
| CN107543777A (en) * | 2017-10-11 | 2018-01-05 | 辽宁科技大学 | The test device and method of blast furnace ferrous furnace charge soft melting dropping characteristic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20131119 |