CN105510198A - Method for measuring granularity of pulverized coal blown into blast furnace - Google Patents
Method for measuring granularity of pulverized coal blown into blast furnace Download PDFInfo
- Publication number
- CN105510198A CN105510198A CN201511009306.4A CN201511009306A CN105510198A CN 105510198 A CN105510198 A CN 105510198A CN 201511009306 A CN201511009306 A CN 201511009306A CN 105510198 A CN105510198 A CN 105510198A
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- coal dust
- coal
- granularity
- screening
- pulverized coal
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- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012216 screening Methods 0.000 claims abstract description 26
- 239000002817 coal dust Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 230000010076 replication Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 238000003556 assay Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a method for measuring granularity of pulverized coal blown into a blast furnace. The method comprises the following steps of sample collection, dry screening, wet screening, weighing and calculation, and the like. By using the method, the measurement time is effectively shortened, and the timeliness and the accuracy of the granularity measurement of the pulverized coal, the screening efficiency and the quality of screening the pulverized coal are improved.
Description
Technical field
The invention belongs to pulverized coal injection in blast furnace quality inspection technical field, be specifically related to a kind of method measuring pulverized coal injection into blast furna Powder Particle Size.
Background technology
Coal dust is powder material important in coal combustion and gasification, coal powder size as the important indicator reflecting coal mill system operating mode in coal gasifying process, control that must be in addition strict in technique.Wherein, pulverized coal injection in blast furnace granularity problem is the problem that ironmaking worker pays close attention to always.The granularity of coal dust has a significant impact burning rate tool.Granularity is less, and burning rate is faster, and utilization ratio is higher.But granularity is less, then the electric energy that consumes of coal-grinding is more, and the wearing and tearing of powder manufacturing apparatus are just large.Generally, pulverized coal injection in blast furnace requires that the ratio of granularity≤0.074mm reaches more than 80%.Along with the widespread use of oxygen enrichment measure and the scope of winding-up coal constantly expand, the requirement of coal powder size is relaxed to some extent.Ensureing that under the condition that pulverized coal injection in blast furnace utilization factor is substantially constant, the ratio of coal powder size≤0.074mm reaches more than 60% and can meet blast fumance requirement.Can power consumption be saved like this, reduce powder process cost, improve the unit-hour output of coal pulverizer, reach the object reducing ironmaking cost.Therefore, the screening quality of coal dust and accuracy rate are important indexs in producing, optimize and improve the assay method of coal powder size, the quality of the accuracy that effective raising coal powder size measures, screening efficiency and screening pulverized coal, for ironmaking production provides conforming to property strong, accurate, reliable technological parameter, to the normal operation of ironmaking production and the stable lifting of quality of pc, be all of great practical significance undoubtedly.
Compare with other common powder materials, coal dust belongs to adhesiveness powder, easily reunites, and not easily disperses, and when carrying out sreen analysis to it, often occurs causing the problems such as measurement result deviation is large, data reappearance is bad because its dispersion effect is bad.For this reason, a kind of method of Accurate Determining pulverized coal injection into blast furna Powder Particle Size is developed.
Summary of the invention
The object of the invention is to provide a kind of method measuring pulverized coal injection into blast furna Powder Particle Size.
The present invention seeks to realize like this, comprise the steps:
(1) sample collection: dry coal dust to be measured for 105 DEG C;
(2) dry screen: the coal dust got after 300g oven dry puts into standard sieve screening 2 ~ 3min that aperture is 0.074mm;
(3) wet screening: described 0.074mm standard sieve is moved to vibration washing in basin, when after water muddiness, just changes a basin clear water and continues washing until water is no longer muddy, then taken out by the coal dust of >0.074mm in standard sieve and dry;
(3) weigh calculating: the coal dust of granularity >0.074mm is weighed, calculate the massfraction of the coal dust of granularity≤0.074mm, replication 2 times, get its mean value, computing formula is as follows:
w
≤0.074mm=（300－m
>0.074mm）/300×100%。
Embodiment
The invention will be further described below, but limited the present invention never in any form, based on any conversion that training centre of the present invention does, all falls into scope.
The method of mensuration pulverized coal injection into blast furna Powder Particle Size of the present invention comprises the steps:
(1) sample collection: dry coal dust to be measured for 105 DEG C;
(2) dry screen: the coal dust got after 300g oven dry puts into standard sieve screening 2 ~ 3min that aperture is 0.074mm;
(3) wet screening: described 0.074mm standard sieve is moved to vibration washing in basin, when after water muddiness, just changes a basin clear water and continues washing until water is no longer muddy, then taken out by the coal dust of >0.074mm in standard sieve and dry;
(3) weigh calculating: the coal dust of granularity >0.074mm is weighed, calculate the massfraction of the coal dust of granularity≤0.074mm, replication 2 times, get its mean value, computing formula is as follows:
w
≤0.074mm=（300－m
>0.074mm）/300×100%。
Assay method of the present invention is by improving the detection method of coal powder size, and effectively improve the quality of accuracy, screening efficiency and the screening pulverized coal that coal powder size measures, environmental baseline and health of human body also improve.For effective adjustment of pulverized coal preparation technique, the normal operation of ironmaking production and the stable lifting of quality of pc provide strong technical support, and for ironmaking production provides echoing property by force, accurate, reliable technological parameter, has higher application value.
Embodiment 1: use the method for the invention to measure pulverized coal injection into blast furna Powder Particle Size
Dry coal dust to be measured for 105 DEG C; Get the coal dust after 300g oven dry, put into diameter 200mm, aperture is sieve 3min in the standard sieve of 0.074mm; Move to vibration washing in basin again, when after water muddiness, just change a basin clear water and continue washing until water is no longer muddy, then the coal dust of >0.074mm in standard sieve is taken out and dry; Weigh after oven dry, according to the massfraction of the coal dust of formulae discovery granularity≤0.074mm, replication 2 times, gets its mean value.Computing formula is as follows:
w
≤0.074mm=（300－m
>0.074mm）/300×100%。
Result shows: in coal dust to be measured, the massfraction of the coal dust of granularity≤0.074mm is 69.33%.
Embodiment 2: use current methods to measure pulverized coal injection into blast furna Powder Particle Size
Existing conventional method is dry sieving method.Get the coal dust to be measured after drying in 300g embodiment 1, put into diameter 200mm, aperture is the standard sieve of 0.074mm, be placed in test board constantly screening until basic coal dust free under sieve.Poured out by the coal dust of >0.074mm in sieve and weigh, according to the massfraction of the coal dust of formulae discovery granularity≤0.074mm, replication 2 times, gets its mean value.Computing formula is with embodiment 1.
Result shows: in coal dust to be measured, the massfraction of the coal dust of granularity≤0.074mm is 62.71%.
Embodiment 3: compare two kinds of assay methods
The relatively screening efficiency of the method for the invention and current methods.Screening efficiency is usually with being less than the mass ratio of the grade of size of mesh contained by the quality of undersized product obtained during screening and raw material and representing with percentage.Computing formula is as follows:
E=Q
l/Q
o×100%
In formula: E is screening efficiency, %; Q
ofor being less than the fine fraction quality of size of mesh in screening; Q
lfor being less than the fine fraction quality of size of mesh in screen underflow.
Get the coal dust that 1000g granularmetric composition is known, wherein the coal dust of granularity≤0.074mm accounts for 70%, and the coal dust of granularity >0.074mm accounts for 30%.Adopt the method for embodiment 1 and 2 to measure respectively, and compare its screening efficiency, result is as shown in table 1.
The screening efficiency that table 1 two kinds of methods measure coal powder size compares
Two kinds of assay methods are compared, and assay method of the present invention makes the screening efficiency of pulverized coal injection in blast furnace improve 9.0 percentage points.
In sum, assay method of the present invention, by improving the detection method of coal powder size, effectively improves the quality of accuracy, screening efficiency and the screening pulverized coal that coal powder size measures.
Claims (1)
1. measure a method for pulverized coal injection into blast furna Powder Particle Size, it is characterized in that comprising the steps:
(1) sample collection: dry coal dust to be measured for 105 DEG C;
(2) dry screen: the coal dust got after 300g oven dry puts into standard sieve screening 2 ~ 3min that aperture is 0.074mm;
(3) wet screening: described 0.074mm standard sieve is moved to vibration washing in basin, when after water muddiness, just changes a basin clear water and continues washing until water is no longer muddy, then taken out by the coal dust of >0.074mm in standard sieve and dry;
(3) weigh calculating: the coal dust of granularity >0.074mm is weighed, calculate the massfraction of the coal dust of granularity≤0.074mm, replication 2 times, get its mean value, computing formula is as follows:
w
≤0.074mm=（300－m
>0.074mm）/300×100%。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511009306.4A CN105510198A (en) | 2015-12-30 | 2015-12-30 | Method for measuring granularity of pulverized coal blown into blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511009306.4A CN105510198A (en) | 2015-12-30 | 2015-12-30 | Method for measuring granularity of pulverized coal blown into blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105510198A true CN105510198A (en) | 2016-04-20 |
Family
ID=55718339
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|---|---|---|---|
| CN201511009306.4A Pending CN105510198A (en) | 2015-12-30 | 2015-12-30 | Method for measuring granularity of pulverized coal blown into blast furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248519A (en) * | 2016-08-31 | 2016-12-21 | 山东理工大学 | Wet type ball mill discharging detection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0666712A (en) * | 1992-08-21 | 1994-03-11 | Chubu Electric Power Co Inc | Testing method for coal friability |
| CN102654444A (en) * | 2012-04-26 | 2012-09-05 | 中冶南方工程技术有限公司 | Method for measuring pulverized coal granularity of blast furnace coal-injection medium-speed milling system |
-
2015
- 2015-12-30 CN CN201511009306.4A patent/CN105510198A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0666712A (en) * | 1992-08-21 | 1994-03-11 | Chubu Electric Power Co Inc | Testing method for coal friability |
| CN102654444A (en) * | 2012-04-26 | 2012-09-05 | 中冶南方工程技术有限公司 | Method for measuring pulverized coal granularity of blast furnace coal-injection medium-speed milling system |
Non-Patent Citations (2)
| Title |
|---|
| 刘海军 等: ""提高细粒量多的煤炭筛分试验有效性的做法"", 《煤质技术》 * |
| 郎秀勇 等: ""协庄选煤厂煤粉湿法筛分试验方法的探讨"", 《煤质技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248519A (en) * | 2016-08-31 | 2016-12-21 | 山东理工大学 | Wet type ball mill discharging detection device |
| CN106248519B (en) * | 2016-08-31 | 2019-05-10 | 山东理工大学 | Wet type ball mill discharging detection device |
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Application publication date: 20160420 |