CN113960243A - Control experiment system and method for rapidly determining adiabatic natural ignition period of coal - Google Patents
Control experiment system and method for rapidly determining adiabatic natural ignition period of coal Download PDFInfo
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Abstract
The application discloses a contrast experiment system and method for rapidly determining a coal adiabatic natural ignition period. The system comprises two coal sample tanks arranged in the same temperature programming furnace, wherein the same coal sample with the same quantity is placed in each coal sample tank, oxygen and nitrogen with the same gas flow are respectively input into the corresponding coal sample tanks by an air generation module and a nitrogen generation module, finally, the relationship between the heat release quantity and the temperature is established according to the tail gas analysis result of the first coal sample tank analyzed by a gas chromatograph, the temperature difference of the two modules and the heat release quantity difference of the two modules at the corresponding coal temperatures are combined, the heating rate and the heating time of different stages are calculated and determined, and the adiabatic natural ignition period of the coal sample is calculated through accumulation.
Description
Technical Field
The application relates to the technical field of coal energy research, in particular to a contrast experiment system and method for quickly determining a coal adiabatic natural ignition period.
Background
The coal can absorb oxygen in the air at normal temperature, and is oxidized at low temperature to release trace heat and primary oxidation products; under the condition of poor heat conduction, heat is accumulated, and the temperature is increased, so that the process of low-temperature oxidation is promoted; when the temperature exceeds the ignition point of coal, spontaneous ignition is eventually caused. The natural ignition period of a coal seam refers to the time that coal exposed during mining takes from exposure to air to spontaneous combustion. When coal seams which are easy to spontaneously combust and spontaneously combust are mined, the mining period of a mining area needs to be determined according to the natural ignition period of the coal seams after fire prevention measures are taken. Therefore, the method for rapidly and accurately measuring the coal adiabatic natural ignition period plays an important role in the aspects of safe mining of coal mines, reduction of carbon emission of coal energy, protection of self calorific value of energy and the like.
At present, the adiabatic natural ignition period of the coal can be measured by methods such as a temperature programming experiment and the like. Although the programmed heating method can accelerate the spontaneous combustion process of the coal and has the functions of rapidly measuring and obtaining the spontaneous combustion characteristics of the coal, the programmed heating method can accelerate the testing speed and ensure that the coal sample does not dissipate heat in a certain relatively high-temperature environment, an external heat source is required to be added, the actual process of the spontaneous combustion of the coal cannot be truly reflected, and the measuring result may be inaccurate.
Disclosure of Invention
It is an object of the present application to provide a control experiment system and method for rapidly determining the adiabatic spontaneous combustion period of coal, which can improve the above-mentioned problems.
The embodiment of the application is realized as follows:
in a first aspect, the present application provides a control experiment system for rapidly determining an adiabatic spontaneous combustion period of coal, comprising:
the device comprises a temperature programming furnace, an air generating module, a nitrogen generating module, a gas chromatograph, a temperature sensing module and an analysis processing device;
the temperature programming furnace is internally provided with a first coal sample tank and a second coal sample tank and is used for heating the first coal sample tank and the second coal sample tank;
the air generating module is communicated with the first coal sample tank through a first air supply pipeline, and the nitrogen generating module is communicated with the second coal sample tank through a second air supply pipeline; an air flow control device is arranged on the first air supply pipeline and/or the second air supply pipeline and is used for controlling the air flow of the first air supply pipeline and the air flow of the second air supply pipeline to be consistent;
the tail gas of the first coal sample tank is respectively conveyed to the gas chromatograph through a pipeline for gas chromatographic analysis; the temperature sensing module is used for respectively acquiring the temperatures of the first coal sample tank and the second coal sample tank in real time; the analysis processing device is electrically connected with the temperature sensing module and the gas chromatograph respectively.
The control experiment system comprises two coal sample tanks arranged in the same programmed heating furnace, wherein the same coal sample with the same quantity is placed in each coal sample tank, the air generation module and the nitrogen generation module respectively input air and nitrogen with consistent gas flow into the corresponding coal sample tanks, and finally the adiabatic natural ignition period of the coal sample is calculated according to the tail gas analysis result of the first coal sample tank analyzed by the gas chromatograph.
The spontaneous combustion heating of the coal sample in the air environment in the first coal sample tank is from two different heat sources, one is chemical heating caused by oxidation spontaneous combustion heat release, and the other is physical heating of the furnace body and the heated air flow. The temperature rise of the coal sample in the nitrogen environment in the second coal sample tank is caused by physical heating. Therefore, the temperature rise of the coal sample in the first coal sample tank minus the physical heating part is chemical heating caused by oxidation, namely the oxidation heat release of the coal sample under the condition of no external heat absorption and release, and the key for calculating the adiabatic spontaneous ignition period is to determine the adiabatic oxidation heat release. Therefore, compared with the traditional temperature programming experiment, the contrast experiment system for rapidly determining the coal adiabatic natural ignition period disclosed by the application is additionally provided with the coal sample tank in a nitrogen environment, the measurement speed of the traditional temperature programming experiment is ensured, meanwhile, the influence of an additional exogenous heat source can be eliminated for the experiment result, and the accuracy of the measured coal sample adiabatic natural ignition period is improved.
In an alternative embodiment of the present application, the air generating module comprises an air compressor, a freeze dryer, and a three-way ball valve; the air outlet end of the air compressor is communicated with the air inlet end of the cold dryer through a pipeline, and the air outlet end of the cold dryer is communicated with the air inlet of the three-way ball valve through a pipeline; and a first gas outlet of the three-way ball valve is communicated with the first coal sample tank through the first gas supply pipeline.
In an alternative embodiment of the present application, the nitrogen generation module comprises a filtering device and a nitrogen generator; and a second gas outlet of the three-way ball valve is communicated with a gas inlet end of the filtering device through a pipeline, a gas outlet end of the filtering device is communicated with a gas inlet of the nitrogen generator, and a gas outlet of the nitrogen generator is communicated with the second coal sample tank through the second gas supply pipeline.
It can be understood that, in the beginning of the experiment, the air compressor and the nitrogen generator are started, the diversion of the air and the nitrogen is controlled through the three-way ball valve, and the flow rate of the nitrogen and the air input into each coal sample tank is ensured to be consistent through the flow rate control device arranged on the first air supply pipeline and/or the second air supply pipeline.
In an alternative embodiment of the present application, the gas flow control device comprises a gas flow meter and a ball valve.
In an alternative embodiment of the present application, the analysis processing apparatus further includes a processor, an input device, an output device, and a memory, where the processor, the input device, the output device, and the memory are connected to each other, where the memory is used for storing a computer program, and the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to any one of the second aspects.
In a second aspect, the present application provides a control experiment method for rapidly determining a coal adiabatic spontaneous combustion period, which is applied to the control experiment system for rapidly determining a coal adiabatic spontaneous combustion period according to any one of the first aspect, and comprises:
respectively putting equal amounts of the same coal samples into the first coal sample tank and the second coal sample tank;
starting the air generation module to convey air to the first coal sample tank, starting the nitrogen generation module to convey air to the second coal sample tank, and controlling the flow rates of input air and input nitrogen to be consistent through the gas flow control device;
heating the first coal sample tank and the second coal sample tank through the programmed heating furnace according to a preset heating speed; acquiring the coal sample temperatures in the first coal sample tank and the second coal sample tank in real time through the temperature sensing module to be respectively used as a first coal sample temperature and a second coal sample temperature;
after the temperature of the first coal sample reaches the low threshold temperature and before the temperature of the first coal sample does not reach the high threshold temperature, the analysis processing device obtains a tail gas analysis result of the first coal sample tank analyzed by the gas chromatograph as a tail gas analysis result when the temperature of the first coal sample rises by a preset temperature amount;
and the analysis processing device calculates the adiabatic natural ignition period of the coal sample according to the tail gas analysis result.
It can be understood that the application discloses a control experiment method for rapidly determining the adiabatic spontaneous combustion period of the coal, which is applied to the control experiment system for rapidly determining the adiabatic spontaneous combustion period of the coal in any one of the first aspect. Compared with the traditional temperature programming experiment, the method needs to obtain the second coal sample temperature while obtaining the tail gas analysis result and the first coal sample temperature of the first coal sample tank, then eliminates the influence of an additional exogenous heat source for the tail gas analysis result of the first coal sample tank through the second coal sample temperature, and improves the accuracy of the measured coal sample adiabatic natural ignition period.
In an alternative embodiment of the present application, the tail gas analysis result includes the oxygen concentration in the tail gas of the first coal sample tank obtained each time;
calculating the adiabatic natural ignition period of the coal sample according to the tail gas analysis result, wherein the calculation comprises the following steps:
calculating a sufficient oxidation heat release intensity function of the coal sample according to the tail gas analysis result;
respectively calculating the sufficient oxidation heat release quantities of the coal samples in the first coal sample tank and the second coal sample tank before and after the temperature of the first coal sample rises by the preset temperature quantity according to the sufficient oxidation heat release intensity function, and respectively taking the sufficient oxidation heat release quantities as a first sufficient oxidation heat release quantity and a second sufficient oxidation heat release quantity;
calculating a difference between the first sufficient oxidation exotherm and the second sufficient oxidation exotherm as an adiabatic oxidation exotherm;
and calculating the adiabatic spontaneous ignition period of the coal sample in the temperature range from the low threshold temperature to the high threshold according to the adiabatic oxidation heat release.
It is understood that the first sufficient oxidation exotherm comprising the heat generated by chemical heating by the oxidation auto-ignition exotherm and the heat generated by physical heating by furnace heating and the second sufficient oxidation exotherm, i.e., the heat generated by physical heating, are calculated by the above-described sufficient oxidation exotherm intensity function. To accurately calculate the adiabatic spontaneous combustion period of the coal sample, the influence of heat generated by physical heating needs to be eliminated, the adiabatic oxidation heat release is calculated, and then the relatively accurate adiabatic spontaneous combustion period is calculated through the adiabatic oxidation heat release.
Has the advantages that:
the application discloses contrast experimental system of adiabatic spontaneous combustion period of short-term determination coal, including setting up two coal sample jars in same procedure heating stove, put into the same coal sample of equivalent in every coal sample jar, produce the module and produce the module by the air and input the unanimous oxygen of gas flow and nitrogen gas to the coal sample jar that corresponds separately respectively, finally according to the tail gas analysis result of the first coal sample jar that gas chromatograph analyzed, establish the relation of heat release and temperature, the difference in temperature that combines two modules and the heat release difference of two modules correspondence coal temperature down, calculate the rate of rise and the required time of rising temperature of confirming different stages, calculate the adiabatic spontaneous combustion period of coal sample through accumulating. Compare in traditional programming experiment, the control experimental system of the adiabatic spontaneous combustion period of quick definite coal that this application disclosed has increased the coal sample jar of a nitrogen environment more, when guaranteeing the survey speed of traditional programming experiment, can get rid of the influence of additional exogenous heat source for the experimental result, has improved the accuracy of the adiabatic spontaneous combustion period of coal sample of survey.
Compared with the traditional temperature programming experiment, the method for rapidly determining the coal adiabatic natural ignition period needs to obtain the second coal sample temperature while obtaining the tail gas analysis result and the first coal sample temperature of the first coal sample tank, then eliminates the influence of an additional exogenous heat source for the tail gas analysis result of the first coal sample tank through the second coal sample temperature, and improves the accuracy of the determined coal adiabatic natural ignition period.
To make the aforementioned objects, features and advantages of the present application more comprehensible, alternative embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a comparative experimental system for rapidly determining the adiabatic spontaneous combustion period of coal provided by the present application;
FIG. 2 is a schematic diagram of the structure of the analysis processing apparatus in the system of FIG. 1;
FIG. 3 is a schematic flow chart of a comparative experimental method for rapidly determining the adiabatic spontaneous combustion period of coal according to the present application;
FIG. 4 is a schematic diagram showing the relationship between the temperature of the coal samples in the first coal sample tank and the second coal sample tank with time in a control experiment for rapidly determining the adiabatic spontaneous ignition period of the coal provided by the present application;
FIG. 5 is a graphical representation of a function of the intensity of the full oxidation exotherm calculated by the method shown in FIG. 3.
Reference numerals:
the system comprises a temperature programming furnace 10, a first coal sample tank 11, a second coal sample tank 12, an air generating module 20, an air compressor 21, a cold dryer 22, a three-way ball valve 23, a nitrogen generating module 30, a filtering device 31, a nitrogen generator 32, a gas chromatograph 40, a temperature sensing module 50, an analysis processing device 60, a first air supply pipeline 71, a second air supply pipeline 72, an air flow control device 80, a gas flow meter 81 and a ball valve 82.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In a first aspect, as shown in fig. 1, the present application provides a control experiment system for rapidly determining an adiabatic spontaneous combustion period of coal, comprising: a temperature programming furnace 10, an air generating module 20, a nitrogen generating module 30, a gas chromatograph 40, a temperature sensing module 50, and an analysis processing device 60.
A first coal sample tank 11 and a second coal sample tank 12 are arranged in the temperature programming furnace 10, and the temperature programming furnace 10 is used for heating the first coal sample tank 11 and the second coal sample tank 12.
The air generating module 20 is communicated with the first coal sample tank 11 through a first air feeding pipeline 71, and the nitrogen generating module 30 is communicated with the second coal sample tank 12 through a second air feeding pipeline 72; the first air supply pipeline 71 and/or the second air supply pipeline 72 are provided with an air flow control device 80, and the air flow control device 80 is used for controlling the air flow of the first air supply pipeline 71 and the air flow of the second air supply pipeline 72 to be consistent.
The tail gas of the first coal sample tank 11 is respectively conveyed to a gas chromatograph 40 through a pipeline for gas chromatographic analysis; the temperature sensing module 50 is configured to obtain temperatures of the first coal sample tank 11 and the second coal sample tank 12 in real time; the analysis processing device 60 is electrically connected to the temperature sensing module 50 and the gas chromatograph 40, respectively.
It can be understood that the application discloses a contrast experimental system of adiabatic spontaneous combustion period of quick definite coal, including setting up two coal sample jars in same program heating stove 10, the same coal sample of equivalent is put into in every coal sample jar, produces the module 20 and the nitrogen gas by the air and produces the module 30 and input the unanimous air of gas flow and nitrogen gas to the coal sample jar that corresponds separately respectively, finally according to the tail gas analysis result of the first coal sample jar 11 that gas chromatograph 40 analyzed, calculates the adiabatic spontaneous combustion period of coal sample.
As shown in fig. 4, fig. 4 is a schematic diagram of the change of the temperature of the coal samples in the first coal sample tank 11 and the second coal sample tank 12 with time in the control experiment for rapidly determining the adiabatic spontaneous combustion period of the coal provided by the present application. It can be seen that the temperature of the coal sample in the first coal sample tank 11 is much higher than the temperature of the coal sample in the second coal sample tank 12. The spontaneous combustion temperature rise of the coal sample in the air environment in the first coal sample tank 11 comes from two different heat sources, one is chemical heating caused by oxidation spontaneous combustion heat release, and the other is physical heating of the furnace body and the heated air flow. The temperature rise of the coal sample in the nitrogen atmosphere in the second coal sample tank 12 is caused by physical heating. Therefore, the subtraction of the physical heating part from the temperature rise of the coal sample in the first coal sample tank 11 is chemical heating caused by oxidation, that is, the oxidation heat release of the coal sample under the condition of no heat absorption and release to the outside, and the key to calculate the adiabatic spontaneous ignition period is to determine the adiabatic oxidation heat release. Therefore, compared with the traditional temperature programming experiment, the contrast experiment system for rapidly determining the coal adiabatic natural ignition period disclosed by the application is additionally provided with the coal sample tank in a nitrogen environment, the measurement speed of the traditional temperature programming experiment is ensured, meanwhile, the influence of an additional exogenous heat source can be eliminated for the experiment result, and the accuracy of the measured coal sample adiabatic natural ignition period is improved.
In an alternative embodiment of the present application, the air generation module 20 includes an air compressor 21, a freeze dryer 22, and a three-way ball valve 23; the air outlet end of the air compressor 21 is communicated with the air inlet end of the cold dryer 22 through a pipeline, and the air outlet end of the cold dryer 22 is communicated with the air inlet of the three-way ball valve 23 through a pipeline; the first air outlet of the three-way ball valve 23 is communicated with the first coal sample tank 11 through a first air feeding pipeline 71.
In an alternative embodiment of the present application, the nitrogen generation module 30 comprises a filtering device 31 and a nitrogen generator 32; the second gas outlet of the three-way ball valve 23 is communicated with the gas inlet end of the filtering device 31 through a pipeline, the gas outlet end of the filtering device 31 is communicated with the gas inlet of the nitrogen generator 32, and the gas outlet of the nitrogen generator 32 is communicated with the second coal sample tank 12 through a second gas feeding pipeline 72.
It will be appreciated that the experiment was initiated by starting the air compressor 21 and the nitrogen generator 32, controlling the split flow of air and nitrogen through the three-way ball valve 23, and ensuring that the flow rates of nitrogen and air fed into the respective coal sample tanks are consistent through the flow rate control device 80 disposed on the first feed pipe 71 and/or the second feed pipe 72.
In an alternative embodiment of the present application, the airflow control device 80 includes a gas flow meter 81 and a ball valve 82.
As shown in fig. 2, the analysis processing device 60 includes one or more processors 601; one or more input devices 602, one or more output devices 603, and memory 604. The processor 601, the input device 602, the output device 603, and the memory 604 are connected by a bus 905. The memory 604 is used to store computer programs comprising program instructions, and the processor 601 is used to execute the program instructions stored by the memory 604. Wherein the processor 601 is configured to call the program instruction to execute the operation of any one of the methods of the second aspect:
it should be understood that in the embodiment of the present invention, the Processor 601 may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The input device 602 may include a touch pad, a fingerprint sensor (for collecting fingerprint information of a user and direction information of the fingerprint), a microphone, etc., and the output device 603 may include a display (LCD, etc.), a speaker, etc.
The memory 604 may include both read-only memory and random access memory, and provides instructions and data to the processor 601. A portion of the memory 604 may also include non-volatile random access memory. For example, the memory 604 may also store device type information.
In a specific implementation, the processor 601, the input device 602, and the output device 603 described in this embodiment of the present invention may execute an implementation manner described in any method of the second aspect, and may also execute an implementation manner of a terminal device described in this embodiment of the present invention, which is not described herein again.
In a second aspect, as shown in fig. 3, the present application provides a control experiment method for rapidly determining a coal adiabatic spontaneous combustion period, which is applied to the control experiment system for rapidly determining a coal adiabatic spontaneous combustion period of any one of the first aspect, and comprises:
310. and respectively putting the same coal samples with the same quantity into the first coal sample tank and the second coal sample tank.
In order to ensure that the coal sample used in the experiment is consistent with the coal crushing process of the on-site goaf as far as possible, the sealed coal sample is manually beaten and crushed in a laboratory, block coal with the particle size of 20-30mm is screened and placed in a crushing tank, according to the compressive strength of the coal sample and the maximum stress concentration condition of the goaf, a press is adopted to apply the maximum load to the coal sample in the coal sample tank at the loading speed of 1KN/S as the compressive strength value or the maximum stress value of the stress concentration area in the actual goaf, the coal sample is unloaded after the static load reaches the pressure peak value for 5S, and the coal sample is taken out and crushed.
Screening and counting the quality of different particle sizes of the coal sample subjected to pressure bearing crushing, uniformly mixing the particle sizes of the crushed coal sample and the corresponding mass percentages, and filling the mixture into 2 same red copper coal sample tanks, wherein the filling quality, the height, the compaction degree and the like are consistent.
320. And opening the air generation module to convey air to the first coal sample tank, opening the nitrogen generation module to convey air to the second coal sample tank, and controlling the flow rate of the input air to be consistent with that of the input nitrogen through the air flow control device.
In embodiments of the present application, the flow of air and/or nitrogen may be monitored by a gas flow meter mounted on the first and/or second gas feed conduit, the flow on the first and/or second gas feed conduit being modulated by a ball valve.
330. Heating the first coal sample tank and the second coal sample tank by a programmed heating furnace according to a preset heating speed; the coal sample temperatures in the first coal sample tank and the second coal sample tank are obtained in real time through the temperature sensing module and are respectively used as the first coal sample temperature and the second coal sample temperature.
340. After the first coal sample temperature reaches the low threshold temperature and before the first coal sample temperature does not reach the high threshold temperature, the analysis processing device obtains a tail gas analysis result of the first coal sample tank analyzed by the gas chromatograph as a tail gas analysis result every time the first coal sample temperature rises by a preset temperature amount.
350. And the analysis processing device calculates the adiabatic natural ignition period of the coal sample according to the analysis result of the tail gas.
It can be understood that the application discloses a control experiment method for rapidly determining the adiabatic spontaneous combustion period of the coal, which is applied to the control experiment system for rapidly determining the adiabatic spontaneous combustion period of the coal in any one of the first aspect. Compared with the traditional temperature programming experiment, the method has the advantages that the tail gas analysis result of the first coal sample tank is obtained, meanwhile, the tail gas analysis result of the second coal sample tank is also obtained, then the influence of an additional exogenous heat source is eliminated for the tail gas analysis result of the first coal sample tank through the tail gas analysis result of the second coal sample tank, and the accuracy of the determined coal sample adiabatic natural ignition period is improved.
In an alternative embodiment of the present application, the tail gas analysis result includes the oxygen concentration in the first coal sample tank tail gas obtained each time. Step 350 specifically includes:
351. and calculating a sufficient oxidation heat release intensity function of the coal sample according to the tail gas analysis result.
Full oxidation exotherm, assuming oxygen consumption during the experiment is only used to generateCO、CO2Therefore, the first sufficient oxidation exotherm calculated by the above-described sufficient oxidation exotherm intensity function is larger than the actual exotherm intensity, which is referred to as the coal oxidation exotherm intensity upper limit. The minimum time of the natural ignition is represented by combining the adiabatic natural ignition period of the coal, the guidance effect of the index on engineering practice is considered, and the safety can be ensured only by taking the minimum value or the lower limit of the calculation result in a reasonable calculation range. Therefore, we determined that the first sufficient oxidation exotherm calculated by the above-described sufficient oxidation exotherm intensity function is used as a basis for calculation, and since the exotherm intensity is overestimated, the spontaneous ignition period calculated therefrom is small, and the engineering practice process is guided to have higher reliability.
352. And respectively calculating the sufficient oxidation heat release quantities of the coal samples in the first coal sample tank and the second coal sample tank before and after the temperature of the first coal sample rises by the preset temperature quantity according to the sufficient oxidation heat release intensity function, and respectively taking the sufficient oxidation heat release quantities as a first sufficient oxidation heat release quantity and a second sufficient oxidation heat release quantity.
FIG. 5 is a graph showing the temperature on the abscissa and the oxidation exotherm intensity on the ordinate of the graph as a function of the sufficient oxidation exotherm intensity. Before the temperature of the first coal sample rises by a preset temperature value, the temperature of the first coal sample is
The second coal sample temperature is
(ii) a After the temperature of the first coal sample rises by a preset temperature value, the temperature of the first coal sample is
The second coal sample temperature is
. In the figure, the curve is in
To
The area of the interval in the interval is the first sufficient oxidation heat release; the curve is at
To
The area of the interval in the interval is the second sufficient oxidation heat release.
353. The difference between the first sufficient oxidation exotherm and the second sufficient oxidation exotherm is calculated as an adiabatic oxidation exotherm.
Wherein, the adiabatic oxidation exotherm refers to: the oxidation exothermic intensity corresponding to the nitrogen temperature at the same time is subtracted from the upper and lower exothermic intensities under the air environment, and can be calculated by the following formula:
354. and calculating the adiabatic spontaneous ignition period of the coal sample in the temperature range from the low threshold value temperature to the high threshold value according to the adiabatic oxidation heat release.
It is understood that the first sufficient oxidation exotherm comprising the heat generated by chemical heating by the oxidation auto-ignition exotherm and the heat generated by physical heating by furnace heating and the second sufficient oxidation exotherm, i.e., the heat generated by physical heating, are calculated by the above-described sufficient oxidation exotherm intensity function. To accurately calculate the adiabatic spontaneous combustion period of the coal sample, the influence of heat generated by physical heating needs to be eliminated, the adiabatic oxidation heat release is calculated, and then the relatively accurate adiabatic spontaneous combustion period is calculated through the adiabatic oxidation heat release.
In this embodiment, step 351 specifically includes:
3511. the oxygen consumption rate in the standard oxygen concentration environment was calculated by the following formula
：
Wherein the content of the first and second substances,
as the flow rate of the gas, it is,
the concentration of the oxygen is a standard oxygen concentration,
is the cross-sectional area of the coal sample,
and
the heights of any two points in the central axis direction of the coal sample,
and
are respectively as
And
the height corresponds to the oxygen concentration in air.
3512. Calculating the oxygen consumption rate in the first coal sample tank by:
wherein the content of the first and second substances,
is the oxygen concentration in the first coal sample tank.
3513. Calculating the coal sample under the state of standard oxygen concentration through the following formulaCOThe production rate:
wherein the content of the first and second substances,
and
are respectively as
And
in the air to a high degreeCOThe concentration of the active ingredients in the mixture is,nis the porosity of the coal sample.
3514. Calculating the coal sample under the state of standard oxygen concentration through the following formulaCO 2 The production rate:
wherein the content of the first and second substances,
and
are respectively as
And
in the air to a high degreeCO 2 And (4) concentration.
3515. Calculating a sufficient oxidation exotherm intensity function for the coal sample by:
wherein the content of the first and second substances,
is generated by oxidationCOThe average thermal effect of (a) is,
is generated by oxidationCO 2 The average thermal effect of (a) is,
is 319.5 kJ/mol,
it was 446.7 kJ/mol.
Step 354 in the present embodiment includes:
3541. the adiabatic oxidation ramp rate was calculated by the following formula:
wherein the content of the first and second substances,
in order to insulate the heat of oxidation from the heat,
and the heat capacity of the coal sample is the heat capacity of the coal sample before the temperature of the first coal sample rises to the preset temperature.
3542. Calculating the adiabatic oxidation temperature rise time corresponding to the preset temperature amount at each interval by the following formula:
wherein the content of the first and second substances,
and the preset temperature is used as the preset temperature.
3543. Calculating an adiabatic spontaneous ignition period for the coal sample in a temperature range between the low threshold temperature and the high threshold by:
wherein the content of the first and second substances,
is the first coal sample temperatureiIncreasing the adiabatic oxidation temperature rise time corresponding to the preset temperature amount for the second time,tfor the corresponding adiabatic spontaneous ignition period.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. Especially, as for the device, apparatus and medium type embodiments, since they are basically similar to the method embodiments, the description is simple, and the related points may refer to part of the description of the method embodiments, which is not repeated here.
Thus, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.
The expressions "first", "second", "said first" or "said second" used in various embodiments of the present disclosure may modify various components regardless of order and/or importance, but these expressions do not limit the respective components. The above description is only configured for the purpose of distinguishing elements from other elements. For example, the first user equipment and the second user equipment represent different user equipment, although both are user equipment. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.
When an element (e.g., a first element) is referred to as being "operably or communicatively coupled" or "connected" (operably or communicatively) to "another element (e.g., a second element) or" connected "to another element (e.g., a second element), it is understood that the element is directly connected to the other element or the element is indirectly connected to the other element via yet another element (e.g., a third element). In contrast, it is understood that when an element (e.g., a first element) is referred to as being "directly connected" or "directly coupled" to another element (a second element), no element (e.g., a third element) is interposed therebetween.
The above description is only an alternative embodiment of the application and is illustrative of the technical principles applied. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
The foregoing is illustrative of only alternative embodiments of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A control experiment system for rapidly determining a period of adiabatic spontaneous combustion of coal, comprising:
the device comprises a temperature programming furnace, an air generating module, a nitrogen generating module, a gas chromatograph, a temperature sensing module and an analysis processing device;
the temperature programming furnace is internally provided with a first coal sample tank and a second coal sample tank and is used for heating the first coal sample tank and the second coal sample tank;
the air generating module is communicated with the first coal sample tank through a first air supply pipeline, and the nitrogen generating module is communicated with the second coal sample tank through a second air supply pipeline; an air flow control device is arranged on the first air supply pipeline and/or the second air supply pipeline and is used for controlling the air flow of the first air supply pipeline and the air flow of the second air supply pipeline to be consistent;
the tail gas of the first coal sample tank is respectively conveyed to the gas chromatograph through a pipeline for gas chromatographic analysis;
the temperature sensing module is used for respectively acquiring the temperatures of the first coal sample tank and the second coal sample tank in real time;
the analysis processing device is electrically connected with the temperature sensing module and the gas chromatograph respectively.
2. The control experiment system for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 1,
the air generating module comprises an air compressor, a cold dryer and a three-way ball valve;
the air outlet end of the air compressor is communicated with the air inlet end of the cold dryer through a pipeline, and the air outlet end of the cold dryer is communicated with the air inlet of the three-way ball valve through a pipeline; and a first gas outlet of the three-way ball valve is communicated with the first coal sample tank through the first gas supply pipeline.
3. The control experiment system for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 2,
the nitrogen generation module comprises a filtering device and a nitrogen generator;
and a second gas outlet of the three-way ball valve is communicated with a gas inlet end of the filtering device through a pipeline, a gas outlet end of the filtering device is communicated with a gas inlet of the nitrogen generator, and a gas outlet of the nitrogen generator is communicated with the second coal sample tank through the second gas supply pipeline.
4. The control experiment system for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 1,
the gas flow control device comprises a gas flow meter and a ball valve.
5. The control experiment system for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 1,
the analysis processing apparatus further comprises a processor, an input device, an output device, and a memory, the processor, the input device, the output device, and the memory being interconnected, wherein the memory is configured to store a computer program, the computer program comprising program instructions, the processor being configured to invoke the program instructions.
6. A control experiment method for rapidly determining a coal adiabatic spontaneous combustion period, which is applied to the control experiment system for rapidly determining a coal adiabatic spontaneous combustion period according to any one of claims 1 to 5, wherein the method comprises:
respectively putting equal amounts of the same coal samples into the first coal sample tank and the second coal sample tank;
starting the air generation module to convey air to the first coal sample tank, starting the nitrogen generation module to convey air to the second coal sample tank, and controlling the flow rates of input air and input nitrogen to be consistent through the gas flow control device;
heating the first coal sample tank and the second coal sample tank through the programmed heating furnace according to a preset heating speed; acquiring the coal sample temperatures in the first coal sample tank and the second coal sample tank in real time through the temperature sensing module to be respectively used as a first coal sample temperature and a second coal sample temperature;
after the temperature of the first coal sample reaches the low threshold temperature and before the temperature of the first coal sample does not reach the high threshold temperature, the analysis processing device obtains a tail gas analysis result of the first coal sample tank analyzed by the gas chromatograph as a tail gas analysis result when the temperature of the first coal sample rises by a preset temperature amount;
and the analysis processing device calculates the adiabatic natural ignition period of the coal sample according to the tail gas analysis result.
7. The control experiment method for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 6,
the tail gas analysis result comprises the oxygen concentration in the tail gas of the first coal sample tank obtained each time;
calculating the adiabatic natural ignition period of the coal sample according to the tail gas analysis result, wherein the calculation comprises the following steps:
calculating a sufficient oxidation heat release intensity function of the coal sample according to the tail gas analysis result;
respectively calculating the sufficient oxidation heat release quantities of the coal samples in the first coal sample tank and the second coal sample tank before and after the temperature of the first coal sample rises by the preset temperature quantity according to the sufficient oxidation heat release intensity function, and respectively taking the sufficient oxidation heat release quantities as a first sufficient oxidation heat release quantity and a second sufficient oxidation heat release quantity;
calculating a difference between the first sufficient oxidation exotherm and the second sufficient oxidation exotherm as an adiabatic oxidation exotherm;
and calculating the adiabatic spontaneous ignition period of the coal sample in the temperature range from the low threshold temperature to the high threshold according to the adiabatic oxidation heat release.
8. The control experiment method for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 7,
the step of calculating the sufficient oxidation heat release intensity function of the coal sample according to the tail gas analysis result comprises the following steps:
calculating the oxygen consumption rate in the first coal sample tank according to the tail gas analysis result;
and calculating a sufficient oxidation heat release intensity function of the coal sample according to the oxygen consumption rate.
9. The control experiment method for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 8,
the calculating the oxygen consumption rate in the first coal sample tank according to the tail gas analysis result comprises the following steps:
the oxygen consumption rate in the standard oxygen concentration environment was calculated by the following formula
：
Wherein the content of the first and second substances,
as the flow rate of the gas, it is,
the concentration of the oxygen is a standard oxygen concentration,
is the cross-sectional area of the coal sample,
and
the heights of any two points in the central axis direction of the coal sample,
and
are respectively as
And
the oxygen concentration in air to which the altitude corresponds;
calculating the oxygen consumption rate in the first coal sample tank by:
wherein the content of the first and second substances,
is the oxygen concentration in the first coal sample tank;
calculating a sufficient oxidation exotherm intensity function of the coal sample according to the oxygen consumption rate, comprising:
calculating the coal sample under the state of standard oxygen concentration through the following formulaCOThe production rate:
wherein the content of the first and second substances,
and
are respectively as
And
in the air to a high degreeCOThe concentration of the active ingredients in the mixture is,nis the porosity of the coal sample;
calculating the coal sample under the state of standard oxygen concentration through the following formulaCO 2 The production rate:
wherein the content of the first and second substances,
and
are respectively as
And
in the air to a high degreeCO 2 Concentration;
calculating a sufficient oxidation exotherm intensity function for the coal sample by:
wherein the content of the first and second substances,
is generated by oxidationCOThe average thermal effect of (a) is,
is generated by oxidationCO 2 The average thermal effect of (a) is,
is 319.5 kJ/mol,
it was 446.7 kJ/mol.
10. The control experiment method for rapidly determining the adiabatic spontaneous combustion period of coal as set forth in claim 7,
calculating an adiabatic spontaneous ignition period of the coal sample in a temperature range between the low threshold temperature and the high threshold according to the adiabatic oxidation exotherm, comprising:
the adiabatic oxidation ramp rate was calculated by the following formula:
wherein the content of the first and second substances,
heat insulating oxidation heat release; before the temperature of the first coal sample rises to the preset temperature, the temperature of the first coal sample is
The second coal sample temperature is
(ii) a After the temperature of the first coal sample rises by the preset temperature value, the temperature of the first coal sample is
The second coal sample temperature is
； 
The heat capacity of the coal sample before the temperature of the first coal sample rises by the preset temperature is measured;
calculating the adiabatic oxidation temperature rise time corresponding to the preset temperature amount at each interval by the following formula:
wherein the content of the first and second substances,
the preset temperature is measured;
calculating an adiabatic spontaneous ignition period for the coal sample in a temperature range between the low threshold temperature and the high threshold by:
wherein the content of the first and second substances,
is the first coal sample temperatureiIncreasing the adiabatic oxidation temperature rise time corresponding to the preset temperature amount for the second time,tfor the corresponding adiabatic spontaneous ignition period.
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