CN1959412A - Method for mensurating time of sintered material resorted in columnar mixer machine - Google Patents
Method for mensurating time of sintered material resorted in columnar mixer machine Download PDFInfo
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- CN1959412A CN1959412A CN 200510030927 CN200510030927A CN1959412A CN 1959412 A CN1959412 A CN 1959412A CN 200510030927 CN200510030927 CN 200510030927 CN 200510030927 A CN200510030927 A CN 200510030927A CN 1959412 A CN1959412 A CN 1959412A
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- tracer
- time
- sintering feed
- trommel mixer
- mixer
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 title claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 48
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 40
- 230000002285 radioactive effect Effects 0.000 claims description 8
- GKLVYJBZJHMRIY-OUBTZVSYSA-N Technetium-99 Chemical compound [99Tc] GKLVYJBZJHMRIY-OUBTZVSYSA-N 0.000 claims description 5
- PNDPGZBMCMUPRI-HVTJNCQCSA-N 10043-66-0 Chemical compound [131I][131I] PNDPGZBMCMUPRI-HVTJNCQCSA-N 0.000 claims description 4
- 230000005251 gamma ray Effects 0.000 claims description 3
- APFVFJFRJDLVQX-YPZZEJLDSA-N indium-113 Chemical compound [113In] APFVFJFRJDLVQX-YPZZEJLDSA-N 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Abstract
A method for measuring stay-time of sintered material in cylindrical mixer includes preparing tracer by adding radioisotope into sintering material, putting in said tracer on conveying belt at entrance of cylindrical mixer and starting up operation of detector set at exit of cylindrical mixer for leading said conveying belt out, inputting radioisotope counting rate within unit time to data processor for storing data there, increasing said counting rate up to a peak value then decreasing said counting rate and finally restoring counting rate to be level before tracer is put in.
Description
Technical field
The present invention relates to Ferrous Metallurgy sintering process detection technique.
Background technology
Because the continuous deterioration of iron ore resource in the world wide, sintering ore deposit and join the ore deposit condition and produced great changes, from 56% to not waiting below 30%, and the ratio of Australia limonite has brought up to 35% as the ratio in high-quality Brazil ore deposit, and particularly the ratio of fine ore is up to 15%.The limonite that high mixture ratio fine ore and high mixture ratio contain water of crystallization is the principal element that influences the sintering production capacity, has brought adverse influence to SINTERING PRODUCTION.
Mixing granulation is the critical process link of SINTERING PRODUCTION technology, directly has influence on the size composition of compound and sintering feed bed gas penetration potential, and then has influence on the yield and quality of SINTERING PRODUCTION.The mixing granulation of general raw materials for sintering all adopts trommel mixer.In order to estimate the effect that material filling rate in the trommel mixer and sintered compound are granulated, need under normal production conditions, accurately measure the residence time of compound at trommel mixer, determine the mixing and the granulating efficiency of sintering feed.And the sintered compound granulation is a continuous process, be added in the trommel mixer continuously by the conveying belt material, from trommel mixer, discharge continuously again, trommel mixer during ordinary production is one " black box ", thereby it is very difficult in the residence time of trommel mixer accurately to measure sintering feed, lacks effective assay method.
Summary of the invention
The object of the present invention is to provide the method for a kind of hold-up time of measuring sintering feed in trommel mixer, accurately measure the hold-up time of compound in trommel mixer, estimate sinter mixture granulating efficiency in trommel mixer with this.
For achieving the above object, technical scheme of the present invention is to adopt the radio-label method accurately to measure the hold-up time of material in trommel mixer.
Its concrete grammar is radioactive isotope to be joined be mixed with tracer in the sintering feed; Some moments on the travelling belt of trommel mixer porch drop into and contain radioisotopic tracer; Simultaneously, the detector that is installed on the travelling belt of mixer exit is started working, and the radiocounting rate of unit interval of recording is input in the digital treating meter preserves; After tracer dropped into certain hour, the radiocounting rate that records on the detector began to raise, and descended gradually to a certain peak value, returned to the level before tracer drops at last.
From the reaction kinetics angle, trommel mixer itself is exactly a tube-type reactor, and what wherein take place is physical change substantially, also exists unslaked lime to add chemical reactions such as water digestion.Key problem in technology of the present invention is, adopt impulse method to measure the hold-up time of material in trommel mixer, in the trommel mixer porch, pulse signal of inlet input to the sinter mixture solid matter streams of steady flow, be to inject a certain amount of tracer moment, measure then that concentration of tracer can record average incorporation time and the dispersion thereof of material in mixer by its concentration distribution curve in time over time in the streams of exit.
The measuring method that the present invention adopts is the impulse method that the application of radiation isotope is made tracer agent.
Radioactive isotope employing iodine-131 (
131I), can also adopt technetium-99 (
99Tc), indium-113 (
113In) radioactive isotope.
The present invention selects for use radioisotopic characteristics to be: (1) half life period is shorter, (as iodine-131,8.04 days), thereby in product residual time short, can not cause the harm of radioactive ray, can not impact after the decay technology and environment; (2) have the ray (as iodine-131, its γ heat input is 0.365Mev, and the β heat input is 0.605Mev) of appropriate energy, be easy to survey and protection; (3) have high specific activity activity, because in the radioactive tracer process, radiotracer is often diluted, the radiotracer of high specific activity activity helps reducing the dosage of tracer agent; (4) price is lower.
Because the moving phase in trommel mixer is solid, so the form of tracer generally has two kinds of selections: (1) point source, be about to radiomaterial and make a bead that granularity, proportion and moving phase are close, form a point source.(2) distributed source directly joins a certain amount of moving phase with radiomaterial, forms distributed source.Each particle traveled distance in mixer as the sintering feed of moving phase has nothing in common with each other, and obeys the statistical distribution rule.Laboratory measurement is the result show, sintering feed is right
131The radiation absorption of I emission is very strong, and thickness of feed layer is thicker (about 50～150mm), and the position of point source is difficult to expect during discharging, therefore adopts point source relatively poor as the measured reappearance as a result of the form of tracer on the travelling belt.Adopt the advantage of distributed source to be, no matter this source is granularity or more identical with sintering feed than weight average, therefore can reflect the characteristics of motion of sintering feed in mixer truly, measurement result precision height.Therefore the present invention adopts the form of distributed source.
The tracer preparation: get a certain amount of sintering feed in container, add low amounts of water, adding a certain amount of radiotracer, it is stand-by to stir.
The selection of measuring condition:, need to determine to guarantee the minimum radiotracer dosage of hold-up time mensuration precision from radiological health angle and reduction cost of determination.The laboratory measured result shows that suitable tracer consists of: add radioisotope tracer 0.1～1.0mCi in 100～500 gram sintering feeds.
Beneficial effect of the present invention
The present invention adopts the radio-label method to measure the hold-up time technology of sintering feed in trommel mixer and has the following advantages:
(1) the present invention adopts radiotracer to measure the hold-up time of sintering feed in trommel mixer, has very high measuring accuracy.This is because radiotracer adds in the sintering feed, can not change the physical property of sintering feed, to whole sintering mixing, make ball granulating process process and do not cause any interference and influence, and the component of sintering feed do not disturb radioactivity survey yet, thereby can reflect the agenda of sintering feed in trommel mixer truly.
(2) technology and equipment of the present invention's employing is all comparatively simple, and consumptive material is few, and processing ease is so cost of determination is lower.
(3) radioactive isotope that is adopted as
131The I half life period is shorter, and the time residual in product is short, can not cause the harm of radioactive ray, can not impact technology and environment after the decay;
131I also has high specific activity activity, helps reducing the dosage of tracer agent; Price is lower.
Description of drawings
Fig. 1 is a mensuration process flow diagram of the present invention.
Fig. 2 is the measurement result exemplary plot of the concentration of tracer distribution curve in time of one embodiment of the invention.
Embodiment
The course of work that the present invention measures the hold-up time of sintering feed in trommel mixer with tracer method as shown in Figure 1.Some moment on the travelling belt of trommel mixer porch drop into contain iodine-131 (
131I), or technetium-99 (
99Tc), indium-113 (
113In) mixed with little amount material, simultaneously, the detector that is installed on the travelling belt of mixer exit is started working, and the radiocounting rate of unit interval of recording is input in the digital treating meter preserves.After tracer dropped into certain hour, the radiocounting rate that records on the detector began to raise, and descended gradually to a certain peak value, returned to the level before tracer drops at last.The concentration distribution curve in time of radioactive tracer is measured with the gamma-ray detection instrument in the exit, as shown in Figure 1.
The gamma-ray detection instrument adopts higher NaI (T1) scintillation detector of detection sensitivity, its output signal is carried out data recording and processing by computer-controlled gamma energy spectrometer, work out suitable software and can obtain radiocounting curve over time, promptly corresponding to concentration of tracer curve over time, and try to achieve average incorporation time and dispersion thereof.Because the material conveyer belt broad need and connect with three gamma detectors, so that guarantee to have enough measurement sensitivity.
As shown in Figure 2, in the concentration distribution curve in time of this embodiment radioactive tracer, 0 to 2.7sec one section curve promptly can be used as determines the hold-up time of sintering feed in trommel mixer.
Three sintering machines of certain iron company adopt once with the technology of secondary trommel mixer to come sinter mixture is mixed and granulates all, in order to estimate the effect that material filling rate in the trommel mixer and sintered compound are granulated, need under normal production conditions, accurately measure the residence time of compound in trommel mixer.
Table 1
| The mixer numbering | Survey (sec) July 27 hold-up time | Survey (sec) July 30 hold-up time | Survey (sec) July 27 hold-up time | Survey (sec) July 30 hold-up time | Mean residence time (sec) | Twice measuring relative errors (%) | Design calculated value (sec) |
| A-1 | 134.8 | 136.6 | 134.2 | 136.8 | 135.5 | 1.92 | 120 |
| 134.2 | 137.2 | ||||||
| 133.6 | 136.6 | ||||||
| A-2 | 221.4 | 211.8 | 222.0 | 213.8 | 217.9 | 3.76 | 180 |
| 221.4 | 215.4 | ||||||
| 223.2 | 214.2 | ||||||
| B-1 | 144.2 | 145.4 | 143.6 | 145.0 | 144.3 | 0.97 | 120 |
| 143.0 | 144.8 | ||||||
| 143.6 | 144.8 | ||||||
| B-2 | 214.4 | 211.4 | 213.2 | 212.6 | 212.9 | 0.28 | 180 |
| 212.0 | 212.6 | ||||||
| 213.2 | 213.8 | ||||||
| C-1 | 142.5 | 146.7 | 143.3 | 149.3 | 146.3 | 4.10 |
| 143.7 | 151.5 | ||||||
| 143.7 | 149.7 |
At test period, average test result's relative error shows that three sintering machine production runs of A, B, C of this sintering plant are steady, the hold-up time substantially constant of sintering feed between 0.9～2.36%.The hold-up time of sintering feed in all mixers illustrates in the equipment actual design to keep to some extent all greater than design calculated value (C sintering machine design calculated value is an estimated value) 10～22%.
Table 2
| The mixer numbering | Survey (sec) November 26 hold-up time | Survey (sec) November 29 hold-up time | Survey (sec) November 26 hold-up time | Survey (sec) November 29 hold-up time | Mean residence time (sec) | Twice measuring relative errors (%) | Design calculated value (sec) |
| A-1 | 129.3 | 132.0 | 128.8 | 131.8 | 130.3 | 2.31 | 120 |
| 128.1 | 132.0 | ||||||
| 129.0 | 131.4 | ||||||
| A-2 | 208.8 | 213.0 | 206.9 | 213.6 | 210.2 | 3.22 | 180 |
| 205.9 | 215.4 | ||||||
| 205.8 | 212.4 | ||||||
| B-1 | 139.6 | 136.5 | 137.9 | 136.2 | 137.0 | 1.27 | 120 |
| 135.7 | 136.6 | ||||||
| 138.4 | 135.4 | ||||||
| B-2 | 220.7 | 220.5 | 220.4 | 219.3 | 219.8 | 0.50 | 180 |
| 220.8 | 217.8 | ||||||
| 219.6 | 219.6 | ||||||
| C-1 | 147.3 | 146.0 | 146.1 | 146.7 | 146.4 | 0.39 | |
| 145.5 | 147.3 | ||||||
| 145.5 | 146.7 | ||||||
| C-2 | 210.6 | 216.63 | 210.4 | 215.4 | 212.9 | 2.36 | |
| 211.8 | 214.83 | ||||||
| 208.8 | 214.83 |
The present invention adopts radiotracer to measure the hold-up time of sintering feed in trommel mixer, has very high measuring accuracy, can be used for accurately estimating the effect of interior material filling rate of trommel mixer and sintered compound granulation, make the gas penetration potential of ball granulating process, the raising bed of material for improving sintering, and then improve the yield and quality of sintering.
The present invention is applied to SINTERING PRODUCTION factory, measure the hold-up time of sintering feed in trommel mixer, with the effect of material filling rate in the evaluation trommel mixer and sintered compound granulation, and can be applied to iron and steel enterprise both domestic and external, thereby application promise in clinical practice is arranged.
Claims (5)
1. the method for hold-up time of measuring sintering feed in trommel mixer joins radioactive isotope and is mixed with tracer in the sintering feed; Some moments on the travelling belt of trommel mixer porch drop into and contain radioisotopic tracer; Simultaneously, the detector that is installed on the travelling belt of mixer exit is started working, and the radiocounting rate of unit interval of recording is input in the digital treating meter preserves; After tracer drops into certain hour, the radiocounting rate that records on the detector is that concentration of tracer begins to raise, to a certain peak value, descend gradually, return to the level before tracer drops at last, thereby obtain sintering feed hold-up time in trommel mixer according to concentration of tracer and time relation curve.
2. the method for mensuration sintering feed hold-up time in trommel mixer as claimed in claim 1 is characterized in that, radioactive isotope adopts iodine-131, technetium-99 or indium-113.
3. the method for mensuration sintering feed hold-up time in trommel mixer as claimed in claim 1 is characterized in that, during the preparation tracer, adds radioisotope tracer 0.1～1.0mCi in 100～500 gram sintering feeds.
4. the method for mensuration sintering feed hold-up time in trommel mixer as claimed in claim 1 is characterized in that, detector adopts gamma ray detector.
5. the method for mensuration sintering feed hold-up time in trommel mixer as claimed in claim 1 is characterized in that detector is provided with several along the material conveyer belt Width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510030927 CN1959412A (en) | 2005-10-31 | 2005-10-31 | Method for mensurating time of sintered material resorted in columnar mixer machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510030927 CN1959412A (en) | 2005-10-31 | 2005-10-31 | Method for mensurating time of sintered material resorted in columnar mixer machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1959412A true CN1959412A (en) | 2007-05-09 |
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|---|---|---|---|
| CN 200510030927 Pending CN1959412A (en) | 2005-10-31 | 2005-10-31 | Method for mensurating time of sintered material resorted in columnar mixer machine |
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| Country | Link |
|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380684A (en) * | 2011-08-17 | 2012-03-21 | 深圳市劲拓自动化设备股份有限公司 | Method and device for indicating presence of board in reflow oven |
| CN103149269A (en) * | 2013-03-11 | 2013-06-12 | 牧羊有限公司 | Tracer agent addition device with continuous mixing machine |
-
2005
- 2005-10-31 CN CN 200510030927 patent/CN1959412A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380684A (en) * | 2011-08-17 | 2012-03-21 | 深圳市劲拓自动化设备股份有限公司 | Method and device for indicating presence of board in reflow oven |
| CN103149269A (en) * | 2013-03-11 | 2013-06-12 | 牧羊有限公司 | Tracer agent addition device with continuous mixing machine |
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Open date: 20070509 |