CN109613203B - Secondary oxidation coal sample spontaneous combustion risk identification method and electronic equipment thereof - Google Patents
Secondary oxidation coal sample spontaneous combustion risk identification method and electronic equipment thereof Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 302
- 230000003647 oxidation Effects 0.000 title claims abstract description 300
- 239000003245 coal Substances 0.000 title claims abstract description 109
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 105
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 154
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 154
- 238000002474 experimental method Methods 0.000 claims abstract description 25
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- 230000001681 protective effect Effects 0.000 claims description 55
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- 239000005977 Ethylene Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 21
- 238000005336 cracking Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
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- 229910052760 oxygen Inorganic materials 0.000 description 5
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Abstract
The invention discloses a method for judging the spontaneous combustion risk of a secondary oxidation coal sample and electronic equipment, wherein the method comprises the following steps: obtaining a plurality of experimental scatter points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scatter points; actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value; and monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds a critical carbon monoxide concentration value. The invention determines the critical value of the spontaneous combustion of the secondary oxidation of the coal sample according to the gas generation rules of the primary oxidation and the secondary oxidation of the coal sample in a laboratory, thereby establishing the identification method of the spontaneous combustion risk of the secondary oxidation coal sample.
Description
Technical Field
The invention relates to the technical field of coal mines, in particular to a method for judging the spontaneous combustion risk of a secondary oxidation coal sample and electronic equipment thereof.
Background
With the development of national economy of China, the demand of coal resources is greatly increased, most coal seams mined by mines belong to low-metamorphic and easily-combustible coal seams, spontaneous combustion disasters of the mines frequently occur, and fire accidents caused by secondary oxidation or multiple oxidation of coal account for a large proportion. Coal secondary oxidation is common in mine mining processes, for example: the short-distance coal seam mining or the steep coal seam horizontal sectional mining is influenced by mining disturbance of a lower working face, so that an overlying goaf and a lower goaf collapse, overlap and cross to form a more complex composite goaf, and residual coal in the goaf is subjected to secondary or multiple oxidation; when the coal mine underground fire area is unsealed, the fire area is re-combusted, and residual coal in the fire area is subjected to secondary oxidation; the underground working face is temporarily stopped, protective sealing is adopted for a period of time, and the residual coal in the sealing is secondarily oxidized when the working face is unsealed.
At present, the research on secondary oxidation of coal samples by domestic scholars mainly stays in laboratory research, is not combined with actual conditions on site, and has little guiding significance on secondary oxidation monitoring and safety production in coal mines. In 2014, Dengjun et al studied the spontaneous combustion characteristics of the secondary oxidation coal sample in order to perform early prediction and forecast on the spontaneous combustion risk of the goaf on the working surface of the upper coal seam, and the results showed that the oxygen consumption rate, the CO generation rate and the heat release intensity of the secondary oxidation coal sample are all greater than those of the primary oxidation of the coal sample in the initial oxidation stage, the spontaneous combustion characteristic parameters of the secondary oxidation coal sample in the oxidation later stage are all less than those of the primary oxidation of the coal sample, and the oxygen-containing functional groups in the secondary oxidation coal molecules are significantly increased. In 2014, in order to effectively control the problem of fire zone reburning caused by unsealing, Shifang et al performed primary oxidation and secondary oxidation temperature rise experiments on coal through a coal spontaneous combustion programmed temperature rise experiment table, and research results show that the temperature rise rate is greater than that of primary oxidation in the secondary oxidation process, and the concentration of CO generated by secondary oxidation of a coal sample is higher than that of primary oxidation in a low-temperature stage. In 2015, in order to research the problem of spontaneous combustion prediction and prevention of high-sulfur coal mine stope coal, the spontaneous combustion characteristic parameters of primary oxidation and secondary oxidation of high-sulfur coal are researched by a temperature programming experiment, and the result shows that the oxygen consumption rate, the CO generation rate, the CO2 generation rate and the heat release intensity of the high-sulfur coal at the low-temperature stage of the secondary oxidation are all greater than those of the primary oxidation, after the critical temperature, the intensity of the secondary oxidation reaction is less than that of the primary oxidation, and the secondary oxidation is different from the primary oxidation index gas.
Disclosure of Invention
Therefore, it is necessary to provide a method for identifying spontaneous combustion risk of a secondary oxidation coal sample and an electronic device, aiming at the technical scheme that monitoring and warning are not performed on secondary oxidation spontaneous combustion of the coal sample in the prior art.
The invention provides a method for judging the spontaneous combustion risk of a secondary oxidation coal sample, which comprises the following steps:
obtaining a plurality of experimental scattering points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scattering points;
actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
and monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value.
Further, determining an oxidation critical temperature value according to the experimental scatter, specifically comprising:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
and taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value.
Further, the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
Still further, still include:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
Still further, still include:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
The invention provides electronic equipment for judging the spontaneous combustion risk of a secondary oxidation coal sample, which comprises:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the one processor to cause the at least one processor to:
obtaining a plurality of experimental scattering points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scattering points;
actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
and monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value.
Further, determining an oxidation critical temperature value according to the experimental scatter, specifically comprising:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
and taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value.
Further, the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
Still further, the processor is further capable of:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
Still further, the processor is further capable of:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
The invention determines the critical value of the spontaneous combustion of the secondary oxidation of the coal sample according to the gas generation rules of the primary oxidation and the secondary oxidation of the coal sample in a laboratory, thereby establishing the identification method of the spontaneous combustion risk of the secondary oxidation coal sample.
Drawings
FIG. 1 is a flow chart of the operation of the method for judging the risk of spontaneous combustion of a secondary oxidized coal sample according to the present invention;
FIG. 2 is a dispersion curve of the concentration of CO in the primary oxidation of a coal sample obtained in a laboratory along with the change of temperature;
FIG. 3 is a scatter plot of secondary oxidation CO concentration of a coal sample obtained in a laboratory as a function of temperature;
FIG. 4 is a schematic diagram of an experimental scatter straight line fitting for converting a CO concentration scatter along with a temperature change into a variation relation of a natural logarithm value lnc of a carbon monoxide concentration along with a reciprocal 1/T of the temperature;
FIG. 5 is a schematic diagram of actually measured CO concentration at a coal mine site;
FIG. 6 shows the experimental primary oxidation C2H4A gas concentration dispersion curve with temperature variation;
FIG. 7 shows experimental secondary oxidation C2H4A gas concentration dispersion curve with temperature variation;
FIG. 8 shows the measured secondary oxidation C2H4A gas concentration dispersion curve with temperature variation;
fig. 9 is a schematic diagram of a hardware structure of an electronic device for identifying the spontaneous combustion risk of a secondary oxidation coal sample according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Fig. 1 is a flowchart illustrating a method for identifying the spontaneous combustion risk of a secondary oxidation coal sample, which includes:
step S101, obtaining a plurality of experimental scatter points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scatter points;
step S102, actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
and S103, monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value.
Specifically, referring to fig. 2 to 3, the dispersion point curve of the concentration of CO in the primary oxidation and the secondary oxidation of the coal sample along with the temperature change can be obtained in a laboratory by using the coal spontaneous combustion high-temperature programmed temperature device.
According to the coal oxidation, gases such as CO, CO2 and the like are generated, and the reaction is as follows:
coal) + O2 → mCO + gCO2+ other products (1)
In the formula: m-mole number of CO generated, mol; g-moles of CO2 formed, mol.
According to the arrhenius equation, the reaction rate between coal and oxygen at any temperature T is:
in the formula: co2-the oxygen content in the reaction gas, mol/m 3; n-reaction order.
Suppose that: 1) the mass change of the coal sample before and after the reaction is very small and ignored. 2) The dry air flows axially towards the coal sample tank and the flow rate is stable. 3) The temperature in the coal sample tank is uniform. 4) The product of the reaction between the coal sample and the oxygen in the coal sample tank flows out in time along with the gas flow, and the subsequent oxidation reaction is not influenced.
Based on the above assumptions, the CO generation rate of the coal sample at axial dx of the coal sample tank is:
SdxVco(T)＝Qdc (3)
in the formula, dx is a micro variable along the axial direction of the coal sample tank; dc-volume fraction micro-variables of CO generated in the coal oxidation process;
substituting formula (2) into formula (3) to obtain:
integrating equation (4) yields:
the following results were obtained:
in the formula, S-coal sample tankCross sectional area of m2Preferably 0.29m2(ii) a dx is the micro-variable, m, along the axial direction of the coal sample tank; a-is a pre-exponential factor, based on
Calculating pre-exponential factor of coal by ln [ vco (T)]Is a vertical coordinate, 1/T is a horizontal coordinate, and the intercept lnk of the vertical coordinate axis is used to obtain a pre-pointing factor s-1(ii) a E-activation energy according to
Calculating the activation energy of coal at different temperatures by ln [ Vco (T)]Obtaining activation energy E, J/mol according to the slope of a straight line by taking the ordinate as well as 1/T as the abscissa; t-the thermodynamic temperature of coal, K; vco (T) -CO production rate, m3/(m3S); q is the air flow rate, ml/min; c-volume fraction of CO generated during coal oxidation,%; dc-the micro-variable of the volume fraction of CO generated in the coal oxidation process,%; l is the length of the coal sample tank, m;
-the oxygen content of the reaction gas,%; n-reaction stage number, m-CO generation molar weight, mol.
Referring to FIG. 4, the scatter plot of CO concentration as a function of temperature is converted to an experimental scatter plot of the natural logarithm of carbon monoxide concentration lnc as a function of the reciprocal 1/T of temperature.
Therefore, step S101 can obtain an experimental scatter of the variation of the natural logarithm of the carbon monoxide concentration lnc with the reciprocal 1/T of the temperature, and determine the oxidation critical temperature value accordingly. Then, in step S102, the oxidation critical temperature value is substituted into the actually measured fitting function curve obtained according to the actually measured goaf as shown in fig. 5, so as to obtain the critical carbon monoxide concentration value. The critical carbon monoxide concentration value is used for monitoring in step S103 and triggers the execution of corresponding autoignition safeguards.
The invention determines the critical value of the spontaneous combustion of the secondary oxidation of the coal sample according to the gas generation rules of the primary oxidation and the secondary oxidation of the coal sample in a laboratory, thereby establishing the identification method of the spontaneous combustion risk of the secondary oxidation coal sample. In the monitoring of the goaf, the concentration of carbon monoxide can be very conveniently obtained through a concentration sensor, and the temperature monitoring is difficult to measure accurately due to the coal mine environment, so that the method calculates the oxidation critical temperature value through a laboratory, converts the oxidation critical temperature value into the critical carbon monoxide concentration value of the actual measurement environment of the goaf, and triggers the corresponding spontaneous combustion protection measure by monitoring the concentration of the carbon monoxide.
In one embodiment, the determining the oxidation critical temperature value according to the experimental scatter point specifically includes:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
and taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value.
Referring to fig. 4, when fitting lnc and 1/T scattered points, the fitting may be divided into multiple segments, and the number of fitting points is adjusted by segment fitting, so that the goodness-of-fit value of each linear fitting curve is maximized, and an optimal fitting curve is obtained. The slopes of different fitted straight lines are different, so that it can be determined that the linear relationship between lnc and 1/T of different straight lines is changed greatly, that is, different straight lines represent different oxidation stages. Therefore, the temperature value corresponding to the intersection point of each two sections of fitting straight lines is used as an oxidation critical temperature value, and different oxidation critical temperature values are substituted into an actually measured fitting function curve obtained by actually measuring the goaf, so that the corresponding critical carbon monoxide concentration value is obtained.
In one embodiment, the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
As a preferred embodiment of the present invention, referring to FIG. 4, three linear functions are sequentially obtained, wherein R is2For the goodness of fit of the fitted curve, the first section of straight line function is lnc-2213.41/T +14.60, the second section of straight line function is lnc-5786.90/T +23.47, the third section of straight line function is lnc-8337.34/T +30.90, the intersection point of the first section of straight line function and the second section of straight line function is solved and converted to obtain the critical temperature value T of high-temperature oxidation, which is 402.75K or 129.6 ℃, the intersection point of the second section of straight line function and the third section of straight line function is solved and converted to obtain the critical temperature value T of accelerated oxidation, which is 342.05K or 69.9 ℃, see fig. 5, and the actually measured goaf CO concentration changes with the temperatureScatter points are removed, and a fitting function curve C is actually measuredCO＝0.0029t3-0.6731t2+54.4344t-1262.23，CCO-CO concentration, ppm; t-is the temperature of the coal body, same as T, DEG C. And (3) substituting the critical temperature value T of high-temperature oxidation, which is obtained by a laboratory, of 402.75K or 129.6 ℃ and the critical temperature value T of accelerated oxidation, of 342.05K or 69.9 ℃ into an actually-measured fitting function curve to obtain a critical CO concentration value of 800ppm of high-temperature oxidation and a critical CO concentration value of 244ppm of accelerated oxidation, wherein ppm is the concentration per million.
In one embodiment, the method further comprises the following steps:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
As shown in FIGS. 6 and 7, secondary oxidation C was performed2H4The gas developed a crack temperature of 116 ℃ C, as shown in FIG. 8, measured C2H4The gas has a dry cracking temperature of 114.7 ℃, and the minimum value of 114.7 ℃ is the temperature value of the coal secondary oxidation dry cracking reaction.
Since this temperature is extremely high and spontaneous combustion is likely to occur, ethylene C is detected when the gob is empty2H4And in the process, emergency protective measures are required, and the protective grade of the emergency protective measures is higher than that of the protective measures for accelerating oxidation and spontaneous combustion and is similar to that of the protective measures for high-temperature oxidation and spontaneous combustion.
As shown in table 1, the experimental data obtained by the laboratory through the coal sample temperature-rising oxidation experiment is used to analyze the characteristic temperature parameters such as critical temperature and cracking temperature of the secondary oxidation from the experimental point of view.
TABLE 1 actual measurement of gas concentration in coal mine site
| Temperature/. degree.C | Primary oxidation of C2H4(ppm) | Secondary oxidation of C2H4(ppm) |
| 30 | 0 | 0 |
| 55 | 0 | 0 |
| 78 | 0 | 0 |
| 98 | 0 | 0 |
| 116 | 0 | 0 |
| 134 | 0 | 0.2 |
| 151 | 0.6 | 0.4 |
| 172 | 2.2 | 1.3 |
| 196 | 5 | 3.1 |
As shown in table 2, the on-site measured data of the coal mine is obtained by fitting according to the on-site measured temperature and gas concentration data, and the characteristic temperature obtained by the experiment is substituted into the fitting curve to solve the on-site critical CO concentration. C2H4The temperature of the concentration is the dry cracking temperature, so that the error between the secondary oxidation dry cracking temperature obtained by the experiment and the field measured dry cracking temperature is only needed to be compared, and the dry cracking temperature is very close to the dry cracking temperature and has very high reference value according to data in a table.
In one embodiment, the method further comprises the following steps:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
The critical temperature of secondary oxidation CO gas obtained in a laboratory is 55 ℃, a corresponding fitting curve is obtained through fitting according to the relation between the on-site actually measured CO concentration and temperature, the critical temperature of secondary oxidation CO gas is 55 ℃, the fitting curve is substituted into the fitting curve, and the critical value of the on-site secondary oxidation CO gas is 178 ppm.
Referring to FIG. 3, the temperature of the secondary oxidized CO gas is taken as the critical value of the low-temperature oxidation temperature of 55 ℃, and the temperature is substituted into the actually measured fitting function curve C of the scattered point of the actually measured goaf CO concentration along with the temperature changeCO＝0.0029t3-0.6731t2+54.4344t-1262.23，CCO-CO concentration, ppm; t-is the temperature of the coal body, and the value of the critical CO concentration at the initial low-temperature oxidation is 178 ppm. When the carbon monoxide concentration in the goaf reaches the value, secondary oxidation CO gas can be considered to appear, and corresponding protective measures are required.
Fig. 9 is a schematic diagram of a hardware structure of an electronic device for identifying a risk of spontaneous combustion of a secondary oxidation coal sample according to the present invention, including:
at least one processor 901; and the number of the first and second groups,
a memory 902 communicatively connected to the at least one processor 901; wherein,
the memory 902 stores instructions executable by the one processor to cause the at least one processor to:
obtaining a plurality of experimental scattering points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scattering points;
actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
and monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value.
In fig. 8, one processor 902 is taken as an example.
The electronic device may further include: an input device 903 and an output device 904.
The processor 901, the memory 902, the input device 903, and the display device 904 may be connected by a bus or other means, and are illustrated as being connected by a bus.
The memory 902, serving as a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the method for identifying the auto-ignition risk of a secondary oxidation coal sample in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 901 executes various functional applications and data processing by running the nonvolatile software programs, instructions and modules stored in the memory 902, that is, the method for identifying the spontaneous combustion risk of the secondary oxidation coal sample in the above embodiment is implemented.
The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the secondary oxidation coal sample spontaneous combustion risk judgment method, and the like. Further, the memory 902 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 902 may optionally include a memory remotely located from the processor 901, and the remote memory may be connected to a device for performing the method for identifying the auto-ignition risk of the sample of secondary oxidation through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 903 may receive an input of a user click and generate signal inputs related to user settings and function control of the method for identifying the spontaneous combustion risk of the secondary oxidation coal sample. The display device 904 may include a display screen or the like.
When the one or more modules are stored in the memory 902 and executed by the one or more processors 901, the method for identifying the auto-ignition risk of the secondary oxidation coal sample in any of the above-described method embodiments is performed.
In one embodiment, the determining the oxidation critical temperature value according to the experimental scatter point specifically includes:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
and taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value.
In one embodiment, the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
In one embodiment, the processor is further capable of:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
In one embodiment, the processor is further capable of:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A method for judging the spontaneous combustion risk of a secondary oxidation coal sample is characterized by comprising the following steps:
obtaining a plurality of experimental scattering points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scattering points;
actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value;
the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
2. The method for judging the spontaneous combustion risk of a secondarily oxidized coal sample according to claim 1, further comprising:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
3. The method for judging the spontaneous combustion risk of a secondary oxidation coal sample according to claim 1 or 2, characterized by further comprising:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
4. An electronic device for identifying spontaneous combustion risk of a secondary oxidation coal sample, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the one processor to cause the at least one processor to:
obtaining a plurality of experimental scattering points of the oxidized coal sample in which the natural logarithm value of the carbon monoxide concentration changes along with the reciprocal of the temperature in a spontaneous combustion experiment, and determining an oxidation critical temperature value according to the experimental scattering points;
actually measuring a plurality of actually measured scattered points of the goaf carbon monoxide concentration changing along with the temperature, performing curve fitting on the actually measured scattered points to obtain an actually measured fitting function curve, substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value;
monitoring the goaf, and executing corresponding spontaneous combustion protection measures when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing multi-section straight line fitting on the plurality of experimental scatter points to obtain a plurality of sections of fitting straight lines which are arranged from low to high according to the reciprocal value of the temperature;
taking the temperature value corresponding to the intersection point of every two adjacent fitting straight lines as the oxidation critical temperature value;
the oxidation critical temperature values include: a high temperature oxidation critical temperature value and an accelerated oxidation critical temperature value;
determining an oxidation critical temperature value according to the experimental scatter, which specifically comprises:
performing three-section straight line fitting on the plurality of experimental scatter points to obtain a first fitted straight line, a second fitted straight line and a third fitted straight line which are arranged from low to high according to the reciprocal value of the temperature;
taking a temperature value corresponding to an intersection point of the first fitted straight line and the second fitted straight line as a high-temperature oxidation critical temperature value, and taking a temperature value corresponding to an intersection point of the second fitted straight line and the third fitted straight line as an accelerated oxidation critical temperature value;
substituting the oxidation critical temperature value into the actually measured fitting function curve to obtain an actually measured carbon monoxide concentration value corresponding to the oxidation critical temperature value as a critical carbon monoxide concentration value, and specifically comprising:
respectively substituting the high-temperature oxidation critical temperature value and the accelerated oxidation critical temperature value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the high-temperature oxidation critical temperature value as a high-temperature oxidation critical carbon monoxide concentration value, and obtaining an actually-measured carbon monoxide concentration value corresponding to the accelerated oxidation critical temperature value as an accelerated oxidation critical carbon monoxide concentration value;
when the carbon monoxide concentration of the goaf reaches or exceeds the critical carbon monoxide concentration value, corresponding spontaneous combustion protection measures are executed, and the method specifically comprises the following steps:
and when the concentration of the carbon monoxide in the gob reaches or exceeds the accelerated oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of accelerated oxidation, and when the concentration of the carbon monoxide in the gob reaches or exceeds the high-temperature oxidation critical carbon monoxide concentration value, executing a protection measure of spontaneous combustion of high-temperature oxidation, wherein the protection grade of the protection measure of spontaneous combustion of high-temperature oxidation is higher than that of the protection measure of spontaneous combustion of accelerated oxidation.
5. The electronic device of claim 4, wherein the processor is further capable of:
monitoring the goaf, and if ethylene is monitored to appear, carrying out emergency protective measures, wherein the protective grade of the emergency protective measures is higher than that of the spontaneous combustion protective measures for accelerating oxidation.
6. The electronic device of any of claims 4-5, wherein the processor is further configured to:
obtaining the experiment temperature of the oxidized coal sample when carbon monoxide gas in the spontaneous combustion process of the oxidized coal sample in the spontaneous combustion experiment is generated as a critical value of the low-temperature oxidation temperature;
substituting the low-temperature oxidation temperature critical value into the actually-measured fitting function curve to obtain an actually-measured carbon monoxide concentration value corresponding to the low-temperature oxidation temperature critical value as a low-temperature oxidation critical carbon monoxide concentration value;
and monitoring the goaf, and executing a low-temperature oxidation protective measure when the carbon monoxide concentration of the goaf reaches or exceeds the low-temperature oxidation critical carbon monoxide concentration value, wherein the protective grade of the low-temperature oxidation protective measure is lower than that of the spontaneous combustion protective measure.
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