CN112946060B - Specific magnetization rate method for measuring slagging performance of bituminous coal ash - Google Patents
Specific magnetization rate method for measuring slagging performance of bituminous coal ash Download PDFInfo
- Publication number
- CN112946060B CN112946060B CN202110127134.XA CN202110127134A CN112946060B CN 112946060 B CN112946060 B CN 112946060B CN 202110127134 A CN202110127134 A CN 202110127134A CN 112946060 B CN112946060 B CN 112946060B
- Authority
- CN
- China
- Prior art keywords
- coal ash
- slagging
- specific magnetization
- sample
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a specific magnetization rate method for measuring the slagging performance of bituminous coal ash, which comprises the following steps: 1. manufacturing a test coal ash sample, and recording the weight Mh of the coal ash sample; using a stamper of organic glass, the weight M of the stamper is weighed first 0 Squeezing the coal ash sample until the compression mold is full, avoiding knocking the compression mold in the sample loading process, and weighing the coal ash sample and the compression mold weight M by a balance 1 ，Mh＝M 1 ‑M 0 The method comprises the steps of carrying out a first treatment on the surface of the 2. Measuring the magnetic susceptibility K value of the coal ash sample; inserting the molded coal ash sample into one end of a magnetizing instrument coil, and reading out a magnetic susceptibility K value; 3. calculating a specific magnetization ratio X, X=K/Mh; 4. judging the slagging performance of the coal sample according to the specific magnetization X, wherein the higher the specific magnetization X is, the more serious the slagging performance is, and obtaining the grading range of the slagging trend of the specific magnetization X of the bituminous coal according to the corresponding relation between the specific magnetization X and the slagging index Sc of the one-dimensional flame furnace; the method of the invention requires few samples, and the test method is simple and easy to test. The differences of the seriously-slagging coal types can be displayed more accurately.
Description
Technical Field
The invention relates to the technical field of judging the slagging performance of coal for power, in particular to a specific magnetization rate method for measuring the slagging performance of bituminous coal ash, which is suitable for bituminous coal.
Background
The cinder forming performance of the coal ash is an important index influencing the design and operation of the boiler, no simple index is available at present, the cinder forming performance of the coal sample can be accurately judged, different indexes have different limitations, and more accurate cinder forming performance of the coal ash needs to be determined by a combustion test furnace, but a test method is complex.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a specific magnetization rate method for measuring the slagging performance of bituminous coal ash, which is applicable to bituminous coal; the invention has the advantages that the required samples for the test are few, and the test method is simple and easy to test.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a specific magnetization rate method for measuring slagging performance of bituminous coal ash comprises the following steps:
the first step: preparing a test coal ash sample, and recording the weight Mh and g of the coal ash sample;
using a stamper of organic glass, the weight M of the stamper is weighed first 0 The unit is g; squeezing the coal ash sample until the compression mold is full, avoiding knocking the compression mold in the sample loading process, and weighing the coal ash sample and the compression mold weight M by a balance 1 The unit is g;
Mh＝M 1 -M 0
and a second step of: measuring the magnetic susceptibility K value of the coal ash sample;
inserting the molded coal ash sample into one end of a magnetizing instrument coil, and reading out a magnetic susceptibility K value;
and a third step of: calculating a specific magnetization rate X, wherein the specific magnetization rate X represents the magnetic moment generated by 1 gram of object under the action of an external magnetic field with the magnetic field strength of 1 Oerst, and the unit is cm 3 /g；
X＝K/Mh
Fourth step: judging slagging performance of coal sample according to specific magnetization rate X
The higher the specific magnetization X value is, the more serious the slagging performance is, the grading range of the slagging trend of the specific magnetization X value of the bituminous coal is obtained by the corresponding relation between the specific magnetization X and the slagging index Sc of the one-dimensional flame furnace, and the grading range is shown in the following table:
| X×10 -6 | tendency to slag formation |
| ＜75 | Low and low |
| 75～150 | In (a) |
| 150～290 | High height |
| ＞290 | Severe severity of |
Compared with the prior art, the invention has the following advantages:
the specific magnetization rate method for determining the slagging performance of the bituminous coal ash is suitable for bituminous coal. The invention has the advantages that the required samples for the test are few, and the test method is simple and easy to test. The differences of the seriously-slagging coal types can be displayed more accurately. The test result and the one-dimensional flame furnace slagging index with wide industrial application have stronger correlation, which shows that the index has industrial application value as well.
Detailed Description
The test principle is as follows: a magnetic susceptibility tester is prepared, and the change of magnetic flux is converted into an electric signal k to be directly read out when the magnetic susceptibility is measured.
The instrument probe mainly comprises a primary coil and a secondary coil. The primary coil generates a magnetic field for the magnetizing coil; the secondary coil is used for measuring the change of magnetic flux. The secondary coil is an upper reverse series coil and a lower reverse series coil. In the absence of sample, the signals cancel each other out. When a magnetic sample is inserted into one end, one of the upper coil and the lower coil is far away from the sample, and the influence of the sample on the magnetic flux of the coil is very small and can be ignored; while the other coil, the insertion end coil, generates additional magnetic flux. Then, the electrical signal across the secondary coil shows the change in the magnetic flux. The change in the specimen-side magnetic flux ΔΦ can be expressed by the following formula.
Δφ＝NμHS-NHS＝NHS(μ-1)
Wherein Δφ -magnetic flux varies, wb;
h—the magnetic field strength generated by the primary coil, oersted (H);
n is the number of turns of the secondary coil at the sample end;
s-effective cross-sectional area of secondary coil, m 2 ；
Mu-permeability of the sample, oersted/m (H/m);
relationship between magnetic permeability μ and magnetic susceptibility K:
μ＝1+4πK
then, the above equation becomes:
Δφ＝4πKNHS
in this formula, N, S, H is a constant of the instrument, pi is a constant, and pi=3.14159. ThenProportional to the magnetic susceptibility K of the sample, the constant 4pi NHS=1×10 of the present instrument -6 I.e. k=ΔΦ.
The first step: preparing a test coal ash sample, and recording the weight Mh and g of the coal ash sample;
using a stamper of organic glass, the weight M of the stamper is weighed first 0 The unit is g; squeezing the coal ash sample until the compression mold is full, avoiding knocking the compression mold in the sample loading process, and weighing the coal ash sample and the compression mold weight M by a balance 1 The unit is g;
Mh＝M 1 -M 0
and a second step of: measuring the magnetic susceptibility K value of the coal ash sample;
inserting the molded coal ash sample into one end of a magnetizing instrument coil, and reading out a magnetic susceptibility K value;
and a third step of: calculating a specific magnetization rate X, wherein the specific magnetization rate X represents the magnetic moment generated by 1 gram of object under the action of an external magnetic field with the magnetic field strength of 1 Oerst, and the unit is cm 3 /g；
X＝K/Mh
Fourth step: judging slagging performance of coal sample according to specific magnetization rate X
The higher the specific magnetization X value is, the more serious the slagging performance is, the grading range of the slagging trend of the specific magnetization X value of the bituminous coal is obtained by the corresponding relation between the specific magnetization X and the slagging index Sc of the one-dimensional flame furnace, and the grading range is shown in the following table:
| X×10 -6 | tendency to slag formation |
| ＜75 | Low and low |
| 75～150 | In (a) |
| 150～290 | High height |
| ＞290 | Severe severity of |
。
Specific embodiment case 1: susceptibility testing of Shenhua coal ash
The first step: preparing a test coal ash sample, and recording the weight Mh and g of the coal ash sample;
the volume of use is 0.63585cm 3 Is used for molding the organic glass, and the molding weight M is measured 0 The unit is g; squeezing the coal ash sample until the compression mold is full, avoiding knocking the compression mold in the sample loading process, and weighing the coal ash sample and the compression mold weight M1 by using a balance, wherein the unit is g;
this test weighs M 0 ＝2.0160g，M 1 ＝2.5901g；
Mh＝M1-M 0 ＝2.5901-2.0160＝0.5741g；
And a second step of: measuring the magnetic susceptibility K value of the coal ash sample;
and inserting the molded coal ash sample into one end of a magnetizing instrument coil, and reading out the magnetic susceptibility K value.
The magnetic susceptibility of the gray sample is K=182×10 -6
And a third step of: calculating a specific magnetization ratio X;
X＝K/Mh＝182×10 -6 /0.5741＝317×10 -6 (cm 3 /g)
fourth step: judging slagging performance of coal sample according to specific magnetization rate X
The higher the X value, the more severe the slagging property. The grading range of the slagging trend of the specific magnetization X value of the common bituminous coal is obtained by the corresponding relation between the specific magnetization X and the slagging index Sc of the one-dimensional flame furnace, and is shown in the following table.
| X×10 -6 | Tendency to slag formation |
| ＜75 | Low and low |
| 75～150 | In (a) |
| 150～290 | High height |
| ＞290 | Severe severity of |
The test coal sample has x=317×10 -6 (m 3 /g)，>290×10 -6 Therefore, the serious slagging coal type is judged. The one-dimensional flame furnace slagging index Sc=1.135 also judges that the coal is a serious slagging coal, and shows the accuracy of the testing method.
Claims (1)
1. A specific magnetization method for measuring the slagging performance of bituminous coal ash is characterized by comprising the following steps: the method comprises the following steps:
the first step: preparing a test coal ash sample, and recording the weight Mh and g of the coal ash sample;
using a stamper of organic glass, the weight M of the stamper is weighed first 0 The unit is g; squeezing the coal ash sample until the compression mold is full, avoiding knocking the compression mold in the sample loading process, and weighing the coal ash sample and the compression mold weight M by a balance 1 The unit is g;
Mh＝M 1 -M 0
and a second step of: measuring the magnetic susceptibility K value of the coal ash sample;
inserting the molded coal ash sample into one end of a magnetizing instrument coil, and reading out a magnetic susceptibility K value;
and a third step of: calculating a specific magnetization rate X, wherein the specific magnetization rate X represents the magnetic moment generated by 1 gram of object under the action of an external magnetic field with the magnetic field strength of 1 Oerst, and the unit is cm 3 /g；
X＝K/Mh
Fourth step: judging slagging performance of coal sample according to specific magnetization rate X
The higher the specific magnetization X value is, the more serious the slagging performance is, the grading range of the slagging trend of the specific magnetization X value of the bituminous coal is obtained by the corresponding relation between the specific magnetization X and the slagging index Sc of the one-dimensional flame furnace, and the grading range is shown in the following table:
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127134.XA CN112946060B (en) | 2021-01-29 | 2021-01-29 | Specific magnetization rate method for measuring slagging performance of bituminous coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127134.XA CN112946060B (en) | 2021-01-29 | 2021-01-29 | Specific magnetization rate method for measuring slagging performance of bituminous coal ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112946060A CN112946060A (en) | 2021-06-11 |
| CN112946060B true CN112946060B (en) | 2023-10-20 |
Family
ID=76239831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110127134.XA Active CN112946060B (en) | 2021-01-29 | 2021-01-29 | Specific magnetization rate method for measuring slagging performance of bituminous coal ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112946060B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050070372A (en) * | 2003-12-30 | 2005-07-07 | 주식회사 포스코 | Method for measuring reduction degree of direct reduction iron using measured magnetic susceptibility |
| CN101393119A (en) * | 2008-10-20 | 2009-03-25 | 西安热工研究院有限公司 | Method for detecting coal clinkering property by testing chromatic aberration value of coal ash |
| CN106694209A (en) * | 2015-11-12 | 2017-05-24 | 哈尔滨市永恒鑫科技开发有限公司 | Magnetic separation method for micropowder steel slag |
| CN111413482A (en) * | 2020-04-08 | 2020-07-14 | 西安热工研究院有限公司 | Method for judging coal slagging performance based on initial slagging temperature |
| JP2020153714A (en) * | 2019-03-18 | 2020-09-24 | 株式会社Ｉｈｉ検査計測 | Evaluation method and evaluation device |
-
2021
- 2021-01-29 CN CN202110127134.XA patent/CN112946060B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050070372A (en) * | 2003-12-30 | 2005-07-07 | 주식회사 포스코 | Method for measuring reduction degree of direct reduction iron using measured magnetic susceptibility |
| CN101393119A (en) * | 2008-10-20 | 2009-03-25 | 西安热工研究院有限公司 | Method for detecting coal clinkering property by testing chromatic aberration value of coal ash |
| CN106694209A (en) * | 2015-11-12 | 2017-05-24 | 哈尔滨市永恒鑫科技开发有限公司 | Magnetic separation method for micropowder steel slag |
| JP2020153714A (en) * | 2019-03-18 | 2020-09-24 | 株式会社Ｉｈｉ検査計測 | Evaluation method and evaluation device |
| CN111413482A (en) * | 2020-04-08 | 2020-07-14 | 西安热工研究院有限公司 | Method for judging coal slagging performance based on initial slagging temperature |
Non-Patent Citations (2)
| Title |
|---|
| 崔敬媛 ; 焦红光 ; 陈清如 ; 铁占续 ; 张春光 ; .煤比磁化率随煤中灰分变化关系的研究.煤炭工程.2008,(第08期),全文. * |
| 黄千钧.以煤灰碱酸比与硅铝比的乘积作为动力用煤结渣指数的探讨.动力工程.2004,(第03期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112946060A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI692621B (en) | Electronic scale with correction function and correction method applied thereto | |
| CN112946060B (en) | Specific magnetization rate method for measuring slagging performance of bituminous coal ash | |
| CN104535625A (en) | Capacitance sensing probe and precise spring shift-measurement instrument | |
| CN109870258A (en) | A kind of instrumentation spherical shape indentation detection method of any residual stress of plane | |
| CN106323416B (en) | Capacitance type oil quantity measuring device | |
| CN100389315C (en) | Digital system for solution concentration measurement | |
| CN116796628A (en) | Transformer no-load loss measurement uncertainty assessment method | |
| CN109357606A (en) | A kind of calibrating device for vibrating string type strain transducer clamping device | |
| CN104062355B (en) | Eddy current coil center calibrating installation and calibration method | |
| CN114485978B (en) | Non-contact temperature measurement method and device based on material conductivity-temperature characteristic | |
| CN204374135U (en) | A kind of capacitive sensing probe and precision spring driftmeter | |
| CN109597007B (en) | Semi-open type device, measuring system and measuring method for detecting magnetic performance of non-oriented silicon steel | |
| CN209014395U (en) | A kind of straining membrane structure film surface tension tester | |
| US6390674B1 (en) | Thermal analysis apparatus and method capable of accurately measuring a temperature of a large diameter sample | |
| CN103257268A (en) | Warping plate type intelligent detection microwave power sensor | |
| CN208936950U (en) | A kind of calibrating device for vibrating string type strain transducer clamping device | |
| CN2924546Y (en) | Eddy current conductivity meter measuring circuit | |
| CN112505138A (en) | Pulse eddy current detection method for air gap with multilayer structure | |
| CN217275864U (en) | Measuring device for phases of spline fork and ear hole | |
| CN217687173U (en) | High-precision steam turbine center circumference measuring instrument | |
| CN109458923B (en) | Displacement sensor applied to geotechnical engineering | |
| CN112394306B (en) | Calibration method for multi-temperature initial magnetization curve | |
| CN113176160B (en) | Uniform-velocity rebound hardness test method based on average impact rebound velocity measurement | |
| SU1133528A1 (en) | Electric salinometer checking method | |
| CN209197668U (en) | A kind of concrete parameters precise measurement structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |