CN101726512A - Method for rapidly testing shortest coal spontaneous combustion period by using external constant heating flow source - Google Patents
Method for rapidly testing shortest coal spontaneous combustion period by using external constant heating flow source Download PDFInfo
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- CN101726512A CN101726512A CN200910248678A CN200910248678A CN101726512A CN 101726512 A CN101726512 A CN 101726512A CN 200910248678 A CN200910248678 A CN 200910248678A CN 200910248678 A CN200910248678 A CN 200910248678A CN 101726512 A CN101726512 A CN 101726512A
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Abstract
The invention relates to a method for rapidly testing the shortest coal spontaneous combustion period by using an external constant heating flow source, and relates to a method for testing coal. The method comprises the following steps: (1) removing the surface layer of collected coal, crushing the coal, and taking the crushed coal as a coal sample for test and later use; (2) placing the coal sample into a reaction vessel and starting an air supply and air temperature control system to allow air to flow through the coal body and uniformly pass through the action vessel; and starting the external constant heating flow source to heat the coal body with constant power; (3) starting an oxygen concentration detecting system, and detecting the change rate of oxygen concentration at each characteristic point in the coal body; and (4) substituting the characteristic parameters of a coal spontaneous combustion process which are determined in the test into a calibrated mathematical model of the shortest coal spontaneous combustion period to calculate the shortest coal spontaneous combustion period. The method for rapidly testing the shortest coal spontaneous combustion period by using the external constant heating flow source can rapidly, simply and accurately determine the shortest coal spontaneous combustion period under an adiabatic condition, and can scientifically and rapidly test the shortest coal spontaneous combustion period. The test result has a high credibility.
Description
Technical field
The present invention relates to a kind of coal method of testing, particularly relate to a kind of the shortest spontaneous combustion period method for rapidly testing of coal that adds constant heating flow source
Background technology
The coal body ingress of air is called coal spontaneous combustion stage to the time that begins to take place spontaneous combustion.Spontaneous combustion period prediction is the earliest mainly carried out just slightly estimating with field statistics by rule of thumb, is unit usually with the moon, can not instruct on-the-spot work effectively.For this reason, various countries adopt the spontaneous fire experiment table to simulate coal spontaneous to get angry process, and the one-step prediction coal spontaneous combustion stage of going forward side by side for the anti-fire-fighting work of the colliery scene data that provide the foundation, has obtained good result.
The on-the-spot heat radiation situation of traditional coal low temperature spontaneous fire experiment table approximate simulation, the situation of leaking out and float coal thickness, and with room temperature as the experiment initial temperature, utilize the oxidation of coal heat release to cause that nature heats up, each unique point temperature, gas ingredients situation of change in the continuous monitoring coal body, thereby the low-temperature oxidation exothermic character of research coal, the spontaneous combustion period of forecasting coal.Because the spontaneous combustion period of coal long (tens of days to the several months), shortly also take tens days, this is very uneconomical from the angle of research or experimental test analysis, also is infeasible.Therefore, be based on the laboratory fast measuring, set up a kind of good reproducibility, the rapid assay methods of the coal spontaneous that can comparatively truly reduce ignition real process has important and practical meanings.
Summary of the invention
The object of the present invention is to provide a kind of simple and reliablely, be applicable to laboratory fast measuring coal the most a kind of the shortest spontaneous combustion period method for rapidly testing of coal that adds permanent hot-fluid of short spontaneous combustion period.
The objective of the invention is to be achieved through the following technical solutions:
A kind of the shortest spontaneous combustion period method for rapidly testing of coal that adds constant heating flow source, this method comprises the steps:
(1) coal that will newly gather is removed top layer and broken stand-by as the test coal sample;
(2) get coal sample and add in the reaction vessel, open air feed and wind-warm syndrome control system, allow and distinguished and admirablely in reaction vessel, evenly pass through through coal body; Unlatching adds constant heating flow source, heats to coal body with firm power;
(3) open the oxygen concentration detection system, detect the rate of change of each unique point oxygen concentration in the coal body, can extrapolate oxygen consumption rate according to the rate of change of each unique point oxygen concentration; And can determine that in conjunction with the idealized process of coal spontaneous combustion the low-temperature oxidation of coal thermal discharge is 3 * 10
5J/ (molO
2)-4.2 * 10
5J/ (molO
2) between;
(4) characterisitic parameter of the coal spontaneous combustion process of determining in will testing is brought in the shortest spontaneous combustion period mathematical model of the coal of having demarcated and can be calculated the shortest spontaneous combustion period that produces coal.
The quantity of power that the reaction vessel wall provides in the described a kind of the shortest spontaneous combustion period method for rapidly testing of coal that adds constant heating flow source, the above step (2) is adjustable.
Described a kind of the shortest spontaneous combustion period method of testing of coal that adds constant heating flow source should be demarcated according to the experiment of adiabatic boundary condition before the described mathematical model of the above step (4) is used.
Advantage of the present invention and effect are:
The present invention is based on the laboratory fast measuring, not only overcome large-scale experiment platform experimental period long, cost is high, success ratio low but also avoided small test to be difficult to true reflection coal practical natural and got angry the shortcoming of process, can test the shortest spontaneous combustion period of coal accurately, simple and reliable, applicability is strong.
Description of drawings
Accompanying drawing of the present invention is a process chart.
Embodiment
The present invention is described in detail with reference to the accompanying drawings.
The coal sample that the present invention is good with fragmentation is put into test container, and the test container wall provides constant heat flux that coal sample is heated, owing to add the low-temperature oxidation heat release acting in conjunction of constant heat flux and coal, quickens the spontaneous combustion of coal.By adding the experiment of constant heat flux boundary condition spontaneous combustion of simulated coal process, test out in the coal spontaneous combustion process coal spontaneous combustion characterisitic parameters such as coal body oxidation heat liberation intensity, CO generation rate, critical characteristic temperature spot, keto consumpting speed with the Changing Pattern of coal temperature.Can calculate the shortest spontaneous combustion period that produces coal in the shortest spontaneous combustion period mathematical model of coal of the adiabatic boundary condition that the characterisitic parameter substitution of the coal spontaneous combustion process that obtains in the experiment has been demarcated.
Mathematical model: set up the mathematical model of two-dimentional rotational symmetry coal spontaneous combustion process according to heat and mass and Porous Media mechanics, this model can be found the solution coupled fields such as loose coal flow field, oxygen concentration field and temperature fields.Utilize the result of measuring, provide the boundary condition of simulation, simulate the oxidizing process of coal, determine the actual spontaneous combustion period of coal.
Embodiment:
(1) coal that will newly gather remove the top layer and be broken into mean grain size be 3mm coal sample as the test coal sample stand-by;
(2) 40～50kg coal sample is packed in the reaction vessel, opens air feed and 20 ℃ of control system of wind-warm syndrome, allow airflow temperature keep 20 ℃ constant, in reaction vessel, evenly pass through through coal body with the speed of 0.01m/s; When 20 ℃ of temperature, open and add constant heating flow source, heat until burning to coal body with the 2000W firm power.
(3) open the oxygen concentration detection system, by by the time record reaction vessel center oxygen concentration and reaction vessel exit oxygen concentration, and the critical temperature that obtains coal spontaneous combustion is 75 ℃; Energy of activation less than the critical temperature stage is 34910J/mol, and pre-exponential factor is 64s
-1, the oxygen consumption rate of extrapolating this moment is 13 * 10
-10s
-1, oxidation heat liberation intensity is 1 * 10
-10J/mols; The energy of activation that calculates the accelerated oxidation stage is 72610J/mol, and pre-exponential factor is 20000s
-1The oxygen consumption rate of extrapolating this moment is 95 * 10
-10s
-1, oxidation heat liberation intensity is 5 * 10
-9J/mols;
(4) low-temperature oxidation of coal process keto consumpting speed of determining in will testing and oxidation heat liberation intensity are brought the coal of demarcating the good adiabatic border that does not contain extraneous thermal source heating into and can be calculated that the shortest spontaneous combustion period that produces coal is 25 days in the mathematical model of short spontaneous combustion period.
Claims (3)
1. the shortest spontaneous combustion period method for rapidly testing of coal that adds constant heating flow source is characterized in that this method comprises the steps:
(1) coal that will newly gather is removed top layer and broken stand-by as the test coal sample;
(2) get coal sample and add in the reaction vessel, open air feed and wind-warm syndrome control system, allow and distinguished and admirablely in reaction vessel, evenly pass through through coal body; Unlatching adds constant heating flow source, heats to coal body with firm power;
(3) open the oxygen concentration detection system, detect the rate of change of each unique point oxygen concentration in the coal body, can extrapolate oxygen consumption rate according to the rate of change of each unique point oxygen concentration; And can determine that in conjunction with the idealized process of coal spontaneous combustion the low-temperature oxidation of coal thermal discharge is 3 * 10
5J/ (molO
2)-4.2 * 10
5J/ (molO
2) between;
(4) characterisitic parameter of the coal spontaneous combustion process of determining in will testing is brought in the shortest spontaneous combustion period mathematical model of the coal of having demarcated and can be calculated the shortest spontaneous combustion period that produces coal.
2. a kind of the shortest spontaneous combustion period method for rapidly testing of coal that adds constant heating flow source according to claim 1 is characterized in that the quantity of power that the reaction vessel wall provides in the above step (2) is adjustable.
3. a kind of the shortest spontaneous combustion period method of testing of coal that adds constant heating flow source according to claim 1 is characterized in that should demarcating according to the experiment of adiabatic boundary condition before the described mathematical model of the above step (4) is used.
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| CN200910248678A CN101726512A (en) | 2009-12-23 | 2009-12-23 | Method for rapidly testing shortest coal spontaneous combustion period by using external constant heating flow source |
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| CN101726512A true CN101726512A (en) | 2010-06-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569027A (en) * | 2014-12-29 | 2015-04-29 | 中国神华能源股份有限公司 | Device and method for testing oxygen consumption rate of coal |
| CN105352996A (en) * | 2015-10-20 | 2016-02-24 | 中国矿业大学 | Model test method for testing temperature change of covering rock in underground coal field fire zone |
| CN105510383A (en) * | 2016-01-10 | 2016-04-20 | 西安科技大学 | Device and method for testing shortest spontaneous combustion period and spontaneous combustion characteristic parameters of coal |
| CN113030372A (en) * | 2021-03-24 | 2021-06-25 | 西安科技大学 | Drought area environment simulation coal natural ignition test device and method |
| CN113670980A (en) * | 2021-07-26 | 2021-11-19 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN113960243A (en) * | 2021-11-02 | 2022-01-21 | 宁波工程学院 | Control experiment system and method for rapidly determining adiabatic natural ignition period of coal |
| CN114397323A (en) * | 2021-12-14 | 2022-04-26 | 中煤科工集团沈阳研究院有限公司 | Device and method for measuring shortest natural ignition period of coal |
-
2009
- 2009-12-23 CN CN200910248678A patent/CN101726512A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569027A (en) * | 2014-12-29 | 2015-04-29 | 中国神华能源股份有限公司 | Device and method for testing oxygen consumption rate of coal |
| CN105352996A (en) * | 2015-10-20 | 2016-02-24 | 中国矿业大学 | Model test method for testing temperature change of covering rock in underground coal field fire zone |
| CN105352996B (en) * | 2015-10-20 | 2018-08-10 | 中国矿业大学 | A kind of model test method of test underground coal-field fire overlying strata temperature change |
| CN105510383A (en) * | 2016-01-10 | 2016-04-20 | 西安科技大学 | Device and method for testing shortest spontaneous combustion period and spontaneous combustion characteristic parameters of coal |
| CN105510383B (en) * | 2016-01-10 | 2017-03-15 | 西安科技大学 | Coal shortest spontaneous combustion period and spontaneous fire characteristic parameter testing device and method |
| CN113030372A (en) * | 2021-03-24 | 2021-06-25 | 西安科技大学 | Drought area environment simulation coal natural ignition test device and method |
| CN113030372B (en) * | 2021-03-24 | 2024-04-12 | 西安科技大学 | Device and method for testing natural ignition of simulated coal in arid region environment |
| CN113670980A (en) * | 2021-07-26 | 2021-11-19 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN113670980B (en) * | 2021-07-26 | 2023-09-01 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN113960243A (en) * | 2021-11-02 | 2022-01-21 | 宁波工程学院 | Control experiment system and method for rapidly determining adiabatic natural ignition period of coal |
| CN114397323A (en) * | 2021-12-14 | 2022-04-26 | 中煤科工集团沈阳研究院有限公司 | Device and method for measuring shortest natural ignition period of coal |
| CN114397323B (en) * | 2021-12-14 | 2023-09-12 | 中煤科工集团沈阳研究院有限公司 | Device and method for measuring shortest natural ignition period of coal |
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Open date: 20100609 |