CN101206211A - Method for determining coal ignitability - Google Patents
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- CN101206211A CN101206211A CNA2007101913500A CN200710191350A CN101206211A CN 101206211 A CN101206211 A CN 101206211A CN A2007101913500 A CNA2007101913500 A CN A2007101913500A CN 200710191350 A CN200710191350 A CN 200710191350A CN 101206211 A CN101206211 A CN 101206211A
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Abstract
A measuring method of coal self combustion tendency is suitable for the qualitative analysis and classification of the self combustion tendency of coal bed in a coal mine. The method includes the following steps: through testing the oxygen concentration at the air outlet of a coal sample tank when coal sample reaches the set temperature, the oxidation rate of coal at a low-temperature oxidation stage is judged; through testing cross-point temperature, the oxidation rate at an accelerated oxidation stage is judged; then, combined calculation is carried out through adopting the two parameters to obtain the value of coal self combustion tendency determination index; moreover, the smaller the value is, the easier the self combustion becomes and vice versa. Therefore, the method effectively solves the problem of comprehensive reflection of the characteristics of low-temperature slow oxidation stage and accelerated oxidation stage of coal self combustion, and increases the measuring accuracy of coal self combustion tendency; moreover, with simple and reliable operation and unified classification standard, the entire measuring process only needs to test two parameters and can be completed within 3 hours to 4 hours. In addition, with a simple method, convenient operation, time saving and labor saving and accurate testing result, the invention has wide practicality in the related field.
Description
Technical field
The present invention relates to a kind of method for determining coal ignitability, be applicable to the qualitative and classification of the spontaneous combustion tendency in coal seam, colliery.
Background technology
Spontaneous combustion of coal is one of major casualty of facing of China's coal-mine safety in production, and China has the coal seam of spontaneous combustion tendency to account for 79.93% of working seam sum, and all there is the problem of spontaneous fire basically in the mine that thick seam can be adopted in state-owned emphasis colliery.Determining coal ignitability is the prerequisite that mine can effectively be carried out anti-fire-fighting work.At present, method for determining coal ignitability: mainly contain adiabatic oxidizing process (U.S., Australia etc.), high-temperature activation energy method (Poland), point of crossing temperature method (India, Turkey etc.) etc. abroad; The assay method of domestic current is the chromatogram oxygen adsorption method, this method with every gram dry coal at normal temperature (30 ℃), normal pressure (1.0133 * 10
5Pa) oxygen absorbed under is classified to the coal ignitability as leading indicator.External adiabatic method for oxidation test period of adopting is grown (often needing tens hours even tens hours), test condition harshness; High-temperature activation can method, the oxidation that is coal under higher temperature (usually＞140 ℃) condition of point of crossing temperature method reflection is from thermal characteristics, can't reflect the whole oxidation and spontaneous combustion process that comprises the low-temperature oxidation stage.The method of domestic employing has the following disadvantages: at first, coal is only relevant with the surface nature and the pore texture of coal to the physisorption amount of oxygen, can not reflect the overall characteristic of coal spontaneous combustion low temperature slow oxidation stage and accelerated oxidation; Secondly, the oxygen absorbed of coal is not represented the amount of oxygen of participating in oxidation reaction under the normal temperature, and the amount of oxygen of participating in oxidation reaction depends primarily on the kind and the number of reactive group in the texture of coal; The 3rd, the criteria for classification disunity, different flammable ash free basis volatile matter criteria for classifications is inconsistent, can cause the tendentiousness test result seriously to be judged by accident because of the fluctuation of flammable ash free basis volatile matter in critical value permissible error scope.
Summary of the invention
The objective of the invention is the problem according to the prior art existence, it is simple to propose a kind of method, easy to operate, quantitative test, accuracy of measurement height, short coal ignitability's assay method consuming time.
Method for determining coal ignitability of the present invention is as follows:
(1) get fresh coal sample and carry out fragmentation, the coal sample that particle diameter is 0.18mm～0.38m is got in screening, and coal sample is carried out putting into the coal sample jar after the dried;
(2) the coal sample jar is put into test box, in the coal sample jar, feed the dry air of higher regime flow, simultaneously test box is set at 40 ℃ of temperature-constant operations;
(3) when the intensification of survey coal sample reaches 40 ℃, the dry air flow of higher regime flow is turned down and kept stable, test box is set at the temperature programme of fixed rate, opens the data acquisition unit that links to each other with test box simultaneously the temperature of test box and coal sample is carried out data acquisition;
The gas of coal sample jar gas outlet when (4) reaching setting value with gas chromatograph test coal sample temperature, record oxygen concentration C data are adjusted into higher regime flow before with the dry air flow that feeds the coal sample jar;
(5) when showing the coal sample temperature of gathering, data acquisition unit stops data acquisition when surpassing the test box temperature, and the value of the coal sample point of crossing temperature T that shows in the record data collector;
(6) oxygen concentration C and the following formula of point of crossing temperature T substitution are calculated the coal ignitability and judge index I value,
I＝40×(0.6×I
C+0.4×I
T)-300
In the formula: I judges index for the coal ignitability;
I
CBe coal sample jar gas outlet oxygen concentration index;
I
TFor coal in temperature programme condition undercrossing point humidity index;
Set the coal ignitability and judge that index I＜600 are easy spontaneous combustion coal seam, 600≤I≤1200 are the spontaneous combustion coal seam, and I＞1200 are for being difficult for the spontaneous combustion coal seam; Judge the value of index I according to the coal ignitability who calculates, can determine the spontaneous combustion tendency of coal.
The described temperature of putting into the coal sample dried of coal sample jar is controlled at below 50 ℃; The described dry air flow that feeds higher regime flow in the coal sample jar is 96ml/min; Than low discharge is 8ml/min; The fixed routine heating rate that described test box is set is 0.8 ℃/min; When described usefulness gas chromatography instrument was tested coal sample jar gas outlet gas, the setting value of coal sample temperature was 70 ℃.
Method for determining coal ignitability of the present invention, the oxygen concentration size of coal sample jar gas outlet is judged the speed of low-temperature oxidation of coal stage oxidation rate when mainly reaching design temperature by the test coal sample, oxygen concentration is big more, and oxygen utilization is few more, and oxidation rate is slow more; By testing the speed that the point of crossing temperature is judged accelerated oxidation stage oxidation rate, the point of crossing is low more, and oxidation rate is fast more; Calculate the value that the coal ignitability judges index by these two parameters are synthesized again, the coal ignitability judges the more little easy more spontaneous combustion of the value of index, is not easy spontaneous combustion more greatly more.Calculate by test the parameters C of representing coal spontaneous combustion low temperature slow oxidation stage and accelerated oxidation stage and T, solved the problem that realizes concentrated expression coal spontaneous combustion low temperature slow oxidation stage and accelerated oxidation stage effectively, improved the determining coal ignitability accuracy, operation is simple and reliable, and criteria for classification is unified.Whole mensuration process only need be tested two parameters, and the general 3～4h that only needs can finish.Its method is simple, and is easy to operate, time saving and energy saving, and test result is accurate, has practicality widely in this area.
Embodiment
Embodiment one, take normal village, Yima, Henan pit coal sample, behind the crushing and screening, get the coal sample that particle diameter is 0.18mm～0.38mm, coal sample placed carry out under 40 ℃ of environmental baselines after air drying handles, get 50 ± 0.1g air in the dry coal sample coal sample jar of packing into, and evenly to cover a layer thickness above coal sample be the asbestos of 2mm～3mm.The coal sample jar is put into test box, in the coal sample jar, feed dry air (oxygen concentration is 20.96%), simultaneously the test box temperature is set at 40 ℃ of temperature-constant operations with the higher regime flow of 96ml/min.When the coal sample temperature reaches 40 ℃, the dry air flow that feeds the coal sample jar is adjusted to the stable than low discharge and maintenance of 8ml/min, test box is set at 0.8 ℃/min temperature programme, be that test box increases progressively with the temperature of 0.8 ℃ of per minute on the basis of 40 ℃ of temperature-constant operations, the turn-on data collector is gathered test box temperature and coal sample temperature simultaneously.The gas of the coal sample jar gas outlet when with gas chromatograph coal sample being reached 70 ℃ of design temperatures then, recording oxygen concentration C is 20.39%.The dry air flow than low discharge that will feed the coal sample jar after the gas chromatograph sample introduction finishes immediately is adjusted into the higher regime flow of 96ml/min, and test box continues the speed temperature programme with 0.8 ℃/min.When the coal sample temperature of show gathering when data acquisition unit surpasses 5 ℃ of test box temperature, stop data acquisition, and the point of crossing temperature T of record coal sample under the temperature programme condition (being the temperature of coal sample temperature when equating with the measuring tank temperature) is 148.7 ℃.
Oxygen concentration parameters C and point of crossing temperature T substitution computing formula are obtained the coal ignitability judge index I value,
I＝40×(0.6×I
C+0.4×I
T)-300
I＝332＜600，
According to the oxidation of coal theory of spontaneous combustion, the oxygen concentration C of mensuration is big more, and low-temperature oxidation stage oxidation rate is slow more, and the point of crossing temperature T is high more, and high temperature accelerated oxidation stage oxidation rate is slow more.Therefore, the synthetic coal ignitability who calculates judges the more little easy more spontaneous combustion of value of index I, is not easy spontaneous combustion more greatly more.Through the great number tested data analysis result, to set the coal ignitability and judge that index I＜600 are easy spontaneous combustion coal seam, 600≤I≤1200 are the spontaneous combustion coal seam, I＞1200 are for being difficult for the spontaneous combustion coal seam.Judge the size of index I by the coal ignitability who calculates, can determine the spontaneous combustion tendency of coal.
The coal of measuring Chang Cun ore deposit, Yima, Henan is easy spontaneous combustion coal seam.
Embodiment two, take Xingtai Ge Quan pit coal sample, step and condition are with embodiment one, slightly.Recording oxygen concentration C is 20.29%.The point of crossing temperature T is 182.7 ℃, oxygen concentration parameters C and point of crossing temperature T substitution computing formula obtained the coal ignitability judges index I value,
I=929,600≤929≤1200, the coal of measuring Ge Quan ore deposit, Xingtai is the spontaneous combustion coal seam.
Embodiment three, take Shizuishan card Bu Liang mining area, Ningxia coal sample, step and condition are with embodiment one, slightly.Recording oxygen concentration C is 20.72%.Point of crossing humidity index T is 207.1 ℃, oxygen concentration parameters C and point of crossing temperature T substitution computing formula obtained the coal ignitability judges index I value,
I=1275＞1200, the coal of measuring Shizuishan card Bu Liang mining area, Ningxia is for being difficult for the spontaneous combustion coal seam.
Claims (5)
1. method for determining coal ignitability is characterized in that:
(1) get fresh coal sample and carry out fragmentation, the coal sample that particle diameter is 0.18mm～0.38mm is got in screening, and coal sample is carried out putting into the coal sample jar after the dried;
(2) the coal sample jar is put into test box, in the coal sample jar, feed the dry air of higher regime flow, simultaneously test box is set at 40 ℃ of temperature-constant operations;
(3) when the coal sample intensification reaches 40 ℃, the dry air flow of higher regime flow is turned down and kept stable, test box is set at the temperature programme of fixed rate, opens the data acquisition unit that links to each other with test box simultaneously the temperature of test box and coal sample is carried out data acquisition;
The gas of coal sample jar gas outlet when (4) reaching setting value with gas chromatograph test coal sample temperature, record oxygen concentration C data are adjusted into higher regime flow before with the dry air flow that feeds the coal sample jar;
(5) when showing the coal sample temperature of gathering, data acquisition unit stops data acquisition when surpassing the test box temperature, and the value of the coal sample point of crossing temperature T that shows in the record data collector;
(6) oxygen concentration C and the following formula of point of crossing temperature T substitution are calculated the coal ignitability and judge index I value,
I＝40×(0.6×I
C+0.4×I
T)-300
In the formula: I judges index for the coal ignitability;
I
cBe coal sample jar gas outlet oxygen concentration index;
I
TFor coal in temperature programme condition undercrossing point humidity index;
Set the coal ignitability and judge that index I＜600 are easy spontaneous combustion coal seam, 600≤I≤1200 are the spontaneous combustion coal seam, and I＞1200 are for being difficult for the spontaneous combustion coal seam; Judge the value of index I according to the coal ignitability who calculates, can determine the spontaneous combustion tendency of coal.
2. method for determining coal ignitability according to claim 1 is characterized in that: the described temperature of putting into the coal sample dried of coal sample jar is controlled at below 50 ℃.
3. method for determining coal ignitability according to claim 1 is characterized in that: the described dry air flow that feeds higher regime flow in the coal sample jar is 96ml/min; Than low discharge is 8ml/min.
4. method for determining coal ignitability according to claim 1 is characterized in that: the fixed routine heating rate that described test box is set is 0.8 ℃/min.
5. method for determining coal ignitability according to claim 1 is characterized in that: described during with gas chromatograph test coal sample jar gas outlet gas, the setting value of coal sample temperature is 70 ℃.
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Cited By (13)
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| CN102313760A (en) * | 2011-07-12 | 2012-01-11 | 黄翰文 | Adiabatic spontaneous combustion triangle method for comprehensive evaluation and identification of coal spontaneous combustion risk |
| CN102353763A (en) * | 2011-09-14 | 2012-02-15 | 北京科技大学 | Small simulation device for testing spontaneous combustion period of coal |
| CN102998390A (en) * | 2012-11-28 | 2013-03-27 | 四川省煤炭产业集团有限责任公司 | Method for analyzing carbon monoxide gas in coal under anaerobic condition |
| CN104713899A (en) * | 2015-03-09 | 2015-06-17 | 太原理工大学 | Coal spontaneous combustion tendency identification method based on double-oxygen uptake |
| CN105021793A (en) * | 2014-04-29 | 2015-11-04 | 神华集团有限责任公司 | Method and device for measuring oxygen adsorption capacity of semi-coke in unit mass and application of method and device in activated semi-coke spontaneous combustion tendency evaluation |
| CN105823796A (en) * | 2016-03-11 | 2016-08-03 | 华电电力科学研究院 | Method for measuring spontaneous combustion tendency of coals stored in coal yard |
| CN105973935A (en) * | 2016-04-27 | 2016-09-28 | 重庆大学 | Test device of influence of space and multi-component gas on coal spontaneous combustion tendency |
| CN107064450A (en) * | 2017-03-14 | 2017-08-18 | 中国矿业大学 | The experimental method of the solid thermalization multi- scenarios method of coal body stream under a kind of simulation Thermal-mechanical Coupling |
| CN107290474A (en) * | 2017-06-15 | 2017-10-24 | 中国矿业大学 | A kind of coal spontaneous combustion heating research device and method based on PLC monitoring |
| CN107941852A (en) * | 2017-11-14 | 2018-04-20 | 中国矿业大学 | The synchronous contrast measurement system and assay method of a kind of coal spontaneous combustion diverse characteristics parameter |
| CN110133028A (en) * | 2019-05-30 | 2019-08-16 | 太原理工大学 | A kind of identification method of gangue spontaneous combustion tendency |
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| CN2466652Y (en) * | 2001-01-15 | 2001-12-19 | 陈淮新 | Coal self-combustion prediction forecasting device for safety monitoring of coal mine |
| CN1595129A (en) * | 2004-07-16 | 2005-03-16 | 中国矿业大学 | Thermal insulation testing process and apparatus for simulating coal spontaneous combustion procedure |
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| CN100492001C (en) * | 2006-12-19 | 2009-05-27 | 煤炭科学研究总院重庆分院 | Method for identifying coal self-combustion tendentiousness based on low temp oxidation oxygen consumption |
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| CN102313760B (en) * | 2011-07-12 | 2014-09-24 | 黄翰文 | Adiabatic spontaneous combustion triangle method for comprehensive evaluation and identification of coal spontaneous combustion risk |
| CN102313760A (en) * | 2011-07-12 | 2012-01-11 | 黄翰文 | Adiabatic spontaneous combustion triangle method for comprehensive evaluation and identification of coal spontaneous combustion risk |
| CN102353763A (en) * | 2011-09-14 | 2012-02-15 | 北京科技大学 | Small simulation device for testing spontaneous combustion period of coal |
| CN102353763B (en) * | 2011-09-14 | 2014-05-28 | 北京科技大学 | Small simulation device for testing spontaneous combustion period of coal |
| CN102998390A (en) * | 2012-11-28 | 2013-03-27 | 四川省煤炭产业集团有限责任公司 | Method for analyzing carbon monoxide gas in coal under anaerobic condition |
| CN105021793A (en) * | 2014-04-29 | 2015-11-04 | 神华集团有限责任公司 | Method and device for measuring oxygen adsorption capacity of semi-coke in unit mass and application of method and device in activated semi-coke spontaneous combustion tendency evaluation |
| CN104713899A (en) * | 2015-03-09 | 2015-06-17 | 太原理工大学 | Coal spontaneous combustion tendency identification method based on double-oxygen uptake |
| CN104713899B (en) * | 2015-03-09 | 2017-05-03 | 太原理工大学 | Coal spontaneous combustion tendency identification method based on double-oxygen uptake |
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| CN107064450B (en) * | 2017-03-14 | 2019-04-26 | 中国矿业大学 | Coal body stream consolidates the experimental method of thermalization multi- scenarios method under a kind of simulation Thermal-mechanical Coupling |
| CN107290474A (en) * | 2017-06-15 | 2017-10-24 | 中国矿业大学 | A kind of coal spontaneous combustion heating research device and method based on PLC monitoring |
| CN107941852A (en) * | 2017-11-14 | 2018-04-20 | 中国矿业大学 | The synchronous contrast measurement system and assay method of a kind of coal spontaneous combustion diverse characteristics parameter |
| CN107941852B (en) * | 2017-11-14 | 2019-06-14 | 中国矿业大学 | A kind of the synchronous contrast measurement system and measuring method of coal spontaneous combustion diverse characteristics parameter |
| CN110133028A (en) * | 2019-05-30 | 2019-08-16 | 太原理工大学 | A kind of identification method of gangue spontaneous combustion tendency |
| CN110308173A (en) * | 2019-07-03 | 2019-10-08 | 太原理工大学 | A kind of pile of biomass spontaneous combustion tendency measuring method based on hazard index analysis |
| CN110308173B (en) * | 2019-07-03 | 2021-07-23 | 太原理工大学 | Biomass pile spontaneous combustion tendency determination method based on danger index analysis |
| CN111965213A (en) * | 2020-06-05 | 2020-11-20 | 中国计量大学 | System capable of automatically measuring self-heating tendency of accumulation body |
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