CN107941690B - Method and device for testing CO generated by coal body aiming at impact crushing effect - Google Patents
Method and device for testing CO generated by coal body aiming at impact crushing effect Download PDFInfo
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- CN107941690B CN107941690B CN201711387335.3A CN201711387335A CN107941690B CN 107941690 B CN107941690 B CN 107941690B CN 201711387335 A CN201711387335 A CN 201711387335A CN 107941690 B CN107941690 B CN 107941690B
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- 239000003245 coal Substances 0.000 title claims abstract description 224
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000000694 effects Effects 0.000 title claims abstract description 42
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 49
- 238000002474 experimental method Methods 0.000 claims abstract description 42
- 238000004458 analytical method Methods 0.000 claims abstract description 21
- 238000011010 flushing procedure Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 238000007872 degassing Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 12
- 238000009527 percussion Methods 0.000 claims description 10
- 238000000889 atomisation Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 239000003570 air Substances 0.000 claims 4
- 239000012080 ambient air Substances 0.000 claims 1
- 238000002955 isolation Methods 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 230000002269 spontaneous effect Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- -1 specifically Chemical compound 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
Abstract
The invention discloses a method and a device for testing CO generated by coal aiming at impact crushing effect, wherein a low-temperature drilling sampling method is adopted to obtain a coal sample to be tested, and the coal sample is placed into a closed sample tank; quickly taking out the coal sample in the closed sample tank, putting the coal sample into a coal sample chamber and sealing the coal sample chamber by using a sealing air bag; then, adopting an atmospheric nitrogen flushing analysis method, quickly flushing nitrogen into a coal sample chamber, and completely blowing out the original air and CO in the coal sample chamber; setting blank control experiments and different experimental variables, performing impact experiments on coal samples under different experimental variables, and collecting corresponding experimental data; and comparing and analyzing the blank control test and experimental data obtained under different experimental variable conditions, and exploring the influence of impact crushing effect on the generation of CO in coal under different experimental variables. The method and the device can analyze different effects of impact crushing effect on CO generated by coal under different conditions, and improve the accuracy of early prediction of spontaneous combustion of coal.
Description
Technical Field
The invention relates to the technical field of mining equipment, in particular to a method and a device for testing CO generated by coal aiming at impact crushing effect.
Background
At present, coal seam spontaneous combustion fire disaster is one of main disasters of a mine, coal spontaneous combustion prevention and control is an important work of coal mine safety, the key of coal spontaneous combustion prevention and control is early prediction, the current CO content is the most commonly used index in early prediction of coal spontaneous combustion, and on-site practice shows that besides CO generated by coal spontaneous combustion, CO exists in normal temperature environment, so that scientific and accurate prediction and prediction of coal spontaneous combustion are severely restricted.
According to research, when coal is circularly cut by the coal mining machine, the cutting pick on the roller can generate a severe impact crushing effect with a coal body, CO can be generated in the process, because non-oxidized CO can be generated by the severe impact crushing of the coal, oxygen-containing functional groups in a coal structure can be mechanically activated and decomposed to generate CO when the coal is subjected to the severe impact crushing, uncertainty is brought to early prediction of spontaneous combustion of the coal, but a special experimental method does not exist in the prior art to explore the influence of the impact crushing effect on the CO generated by the coal body, and certain trial test means have large uncertainty, low repeatability and poor effect, so that the influence of the impact crushing effect on the CO generated by the coal body is necessary to be developed.
Disclosure of Invention
The invention aims to provide a method and a device for testing CO generated by a coal body aiming at impact crushing effect, which can analyze different effects of the impact crushing effect on the CO generated by the coal body under different conditions and explore the rule of the CO generated by the coal body under different impact pressure, impact period, impact area, stress crushing effect, rotation crushing condition and humidity condition.
The invention aims at realizing the following technical scheme:
a method of testing for CO production by coal bodies for impact fracture effects, the method comprising:
step 1, obtaining a coal sample to be tested by adopting a low-temperature drilling sampling method, and placing the coal sample into a closed sample tank;
step 2, rapidly taking out the coal sample in the closed sample tank, putting the coal sample into a coal sample chamber and sealing the coal sample chamber by using a sealing air bag;
step 3, rapidly flushing nitrogen into the coal sample chamber by adopting a normal pressure nitrogen flushing analysis method, and completely blowing out the original air and CO in the coal sample chamber;
step 4, setting blank control experiments and different experimental variables, performing impact experiments on the coal sample under the different experimental variables, and collecting corresponding experimental data;
and 5, comparing and analyzing the blank control test and experimental data obtained under different experimental variable conditions, and exploring the influence of impact crushing effect on the generation of coal CO under different experimental variables.
The embodiment of the invention also provides a device for testing CO generated by the coal body aiming at impact crushing effect, which comprises a pressurizing rotation system, an air inlet and outlet system, a multi-component gas measurement system and a temperature and humidity control pre-measurement system, wherein:
the pressurizing and rotating system comprises an impact component, a telescopic rotating rod and a hydraulic controller, and the impact component is driven to conduct impact pressurizing and rotating crushing on the coal sample to be tested;
the impact component is connected to a telescopic rotating rod, and the telescopic rotating rod is in control connection with the hydraulic controller and can stretch and rotate up and down under the control of the hydraulic controller, so that impact pressure is applied to a coal sample to be tested or the coal sample is rotationally pressed at a certain speed;
the gas inlet and outlet system comprises a gas inlet, a gas outlet and a nitrogen cylinder, nitrogen is injected into the coal sample chamber through the nitrogen cylinder and the gas inlet, and the gas in the coal sample chamber is led into the chromatographic analyzer through the gas outlet for analysis;
the air inlet set up in the outside of coal sample room to be connected with flowmeter, control valve and nitrogen cylinder in this way, wherein:
the flowmeter is used for recording the gas flow of the nitrogen cylinder into the coal sample chamber; the control valve is used for controlling the circulation of the nitrogen cylinder gas;
the multi-component gas measurement system comprises a chromatographic analyzer, a gas inlet and outlet system and a gas outlet system, wherein the chromatographic analyzer is used for receiving gas from the coal sample chamber and detecting the concentration of CO in the gas;
the temperature and humidity control pre-measurement system comprises an atomizing nozzle, a water inlet, a water tank and a temperature controller, and is used for regulating and controlling the temperature in the coal sample chamber and displaying the temperature in real time, and controlling the humidity of the coal sample chamber through the atomizing nozzle;
the atomization nozzle is positioned in the coal sample chamber and is used for spraying water after atomizing on the upper surface of the coal sample to be tested, and the atomization nozzle is connected with a water inlet and a water tank in sequence;
the temperature controller is positioned at the outer side of the coal sample chamber and is used for regulating and controlling the temperature in the coal sample chamber.
According to the technical scheme provided by the invention, the method and the device can analyze different effects of impact crushing effect on CO generated by the coal under different conditions, and explore the law of CO generated by the coal under different impact pressure, impact period, impact area, stress crushing effect, rotation crushing condition and moist condition, so that the accuracy of early prediction of spontaneous combustion of the coal is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for testing CO production of coal for impact crushing effect according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a device for testing CO generated by coal for impact crushing effect according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another overall structure of an apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and as shown in fig. 1, a schematic flow chart of a method for testing CO production of coal for impact crushing effect according to an embodiment of the present invention is provided, and the method includes:
step 1, obtaining a coal sample to be tested by adopting a low-temperature drilling sampling method, and placing the coal sample into a closed sample tank;
in the step, a coal sample can be drilled on a working surface or a coal seam roadway, the dispersion speed of CO can be reduced by cooling a core tube and a core drill bit, meanwhile, water is continuously injected in the process, the wetting of a sampling environment is ensured, CO in the coal sample is kept in an original state as much as possible, the coal sample is obtained at fixed points by the method, and the coal sample is filled into a whole-course integrated airtight sample tank with checked air tightness. Specifically, the sampling tube can be cooled by a liquid nitrogen method, so that the coal sample to be tested is ensured to be obtained in a low-temperature environment.
Here, multiple groups of coal samples can be obtained according to the needs, for example, 9 coal samples can be obtained by the same method, wherein 7 coal samples have the same size and are coal samples with the diameter of 50mm and the height of 100 mm; 1 coal sample with diameter of 25mm and height of 100 mm; 1 is a coal sample with the diameter of 100mm and the height of 100mm, all the coal samples are taken from the same coal seam, and the horizontal distance is 1 meter.
Step 2, rapidly taking out the coal sample in the closed sample tank, putting the coal sample into a coal sample chamber and sealing the coal sample chamber by using a sealing air bag;
in this step, the coal sample is taken out from the closed sample tank to be transferred into the coal sample chamber and sealed, and this process needs to be completed quickly, so that the coal sample is prevented from being exposed to air for a long time and subjected to low-temperature oxidation, and thus the process needs to be completed within 10 seconds.
Step 3, rapidly flushing nitrogen into the coal sample chamber by adopting a normal pressure nitrogen flushing desorption method, and completely blowing out the original air and CO in the coal sample chamber;
in the step, in order to ensure that CO in the coal sample chamber is completely discharged before the impact experiment is started, the CO needs to be replaced by nitrogen, specifically, nitrogen in a nitrogen cylinder is introduced into the coal sample chamber through an air inlet, the nitrogen introducing speed is controlled by a control valve, and the introducing speed can be set to be 0.5m 3 The flow meter displays the volume of the introduced nitrogen, continuously introducing for 10 seconds, detecting the concentration of CO through a chromatographic analyzer, and stopping introducing the nitrogen if the CO gas contained in the gas cannot be detected; otherwise, nitrogen is always introduced until the CO gas in the gas cannot be detected.
Step 4, setting blank control experiments and different experimental variables, performing impact experiments on the coal sample under the different experimental variables, and collecting corresponding experimental data;
here, the different experimental variables set may include: impact strength, impact cycle, impact area, crushing action, crushing cutting action, and ambient moisture.
In the concrete implementation process, different experiment groups can be set, and each group of experiments adopts coal samples obtained under the same conditions so as to reduce errors caused by different coal sample conditions to comparison experiments, and specifically:
1) And in the blank control group 0, under the set blank control experiment condition, the coal sample is subjected to an experiment under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃ and no impact is applied, and then the atmospheric pressure nitrogen flushing analysis method is adopted to realize degassing, so that the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained.
2) The method comprises the steps of (1) under the set impact strength experimental conditions, changing different impact strengths of the coal sample under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact period and the area of the impact coal sample are unchanged, performing impact experiments on the coal sample, then implementing degassing by adopting a normal pressure nitrogen flushing analysis method, obtaining all CO amounts released by the coal sample after being placed into a coal sample chamber, and recording data;
for example, the influence of different impact strengths on CO generation can be explored by performing experiments under the conditions of oxygen concentration of 0, ambient temperature of 20 ℃ and impact period of 5s for 10 times; in this test group 1, as an experimental variable, the impact strength may be set to 2MJ/m per square meter 2 、20MJ/m 2 、200MJ/m 2 、2000MJ/m 2 And the like.
3) The experiment group 2 is characterized in that under the set impact period experiment conditions, the coal sample is subjected to impact experiments by changing different impact periods under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃ and the impact strength is unchanged, and then degassing is realized by adopting a normal pressure nitrogen flushing analysis method, so that the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained;
for example, a controlled variable method can be used, in which the oxygen concentration is 0, the ambient temperature is 20 ℃, and the impact strength is 200MJ/m 2 Experiments were conducted under the conditions of (1) to explore the influence of different impact cycles on CO generation; in this experimental group 2, as experimental variables, the impact cycle was set to 2S, 5S, 10S, 15S, etc. different conditions, and total impact was 10 times.
4) The experiment group 3, under the set impact area experiment condition, the coal sample is changed under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged, the impact experiment is carried out on the coal sample, then the atmospheric pressure nitrogen flushing analysis method is adopted to realize the degassing, and the total CO amount released by the coal sample after being put into a coal sample chamber is obtained;
for example, a controlled variable method can be used, at an oxygen concentration of 0, an ambient temperature of 20℃and an impact strength of 200MJ/m 2 And under the condition of 5s of impact period, experiments are carried out to explore the influence of different impact areas on CO generation; in this experimental group 3, the diameters of the coal sample impact surfaces were set to 25mm, 50mm, and 100mm as experimental variables.
5) The experimental group 4, under the set crushing effect experimental conditions, the coal sample is changed into a percussion bit under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged, the percussion bit does not rotate in the impact process, the impact experiment is carried out on the coal sample, then the atmospheric pressure nitrogen flushing analysis method is adopted to realize degassing, and the total CO amount released by the coal sample after being put into a coal sample chamber is obtained;
for example, the impact column can be changed into the impact drill bit by using a controlled variable method, and the impact action on the coal sample is changed into the crushing action, so that the influence of the crushing action on CO generated by the coal sample is explored.
6) The experiment group 5, under the set crushing and cutting experimental conditions, the coal sample is changed into a percussion bit under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged, the percussion bit rotates at a certain angular speed in the impact process, for example, the rotary speed can be 60r/min, the impact experiment is carried out on the coal sample, and then the atmospheric pressure nitrogen flushing analysis method is adopted to realize degassing, so that the total CO amount released by the coal sample after being placed into a coal sample room is obtained;
for example, the impact bit rotation can be increased in the impact process by using a controlled variable method, other variables are unchanged, so as to achieve the effect of accelerating the crushing, thereby exploring the influence of the crushing cutting effect on the CO generated by the coal sample.
7) And the experiment group 6 is used for replacing the impact column with an impact drill bit under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged under the set environmental moisture and crushing and cutting experimental conditions, rotating the impact drill bit at a certain angular speed in the impact process of the drill bit, spraying water to the coal sample while impacting, performing impact experiment on the coal sample under the conditions, and then adopting a normal pressure nitrogen flushing analysis method to realize degassing to obtain the total CO amount released by the coal sample after being placed into a coal sample room.
For example, a controlled variable method can be used, other variables are unchanged, and in the impact process, water in a water tank is sprayed onto a coal sample through the atomization effect of a water inlet and a spray head, so that the coal sample is crushed in a wet environment, and the influence of environmental moisture on CO generated by the coal sample in the crushing and cutting effects is explored.
And 5, comparing and analyzing the blank control test and experimental data obtained under different experimental variable conditions, and exploring the influence of impact crushing effect on the generation of coal CO under different experimental variables.
In this step, the obtained experimental data can be made into a comparison table by using a controlled variable analysis method to analyze, so as to explore the influence of different impact crushing effects on the generation of CO by coal.
For example, it can be made in the form of table 1 below:
TABLE 1 influence of different test variables on the CO production of coal samples
The impact strength, impact period, impact area, crushing effect, crushing cutting effect and influence of environmental moisture on CO generation of coal bodies are respectively explored by a controlled variable method in 6 groups of experiments; finally, the influence of impact crushing effect on CO generation of coal bodies is analyzed through comparison of experimental results.
Based on the above method, the embodiment of the invention further provides a device for testing CO generated by a coal body according to impact crushing effect, as shown in fig. 2, which is a schematic diagram of the overall structure of the device provided by the embodiment of the invention, the device 100 mainly includes a pressurizing rotation system, an air inlet and outlet system, a multi-component gas measurement system and a temperature and humidity control pre-measurement system, and referring to fig. 2, the specific structures of the systems are as follows:
the pressurizing and rotating system comprises an impact component 2, a telescopic rotating rod 4 and a hydraulic controller 5, and the impact component 2 is driven to impact, pressurize and rotationally crush the coal sample 1 to be tested; in specific implementation, the pressurizing and rotating system can set different loading pressures, impact frequencies and rotating speeds according to different requirements; the coal sample 1 to be tested can be taken from underground coal mine for impact crushing experiments;
the impact part 2 is connected to a telescopic rotating rod 4, and the telescopic rotating rod 4 is in control connection with the hydraulic controller 5 and can stretch and rotate up and down under the control of the hydraulic controller 5, so as to apply impact pressure to the coal sample 1 to be tested or apply pressure at a certain speed;
the gas inlet and outlet system comprises a gas inlet 7, a gas outlet 8 and a nitrogen bottle 11, nitrogen is injected into the coal sample chamber 6 through the nitrogen bottle 11 and the gas inlet 7, and the gas in the coal sample chamber 6 is led into a chromatographic analyzer 15 for analysis through the gas outlet 8; the coal sample chamber 6 is a place where the coal sample 1 to be tested is placed, and the inside is filled with nitrogen;
the air inlet 7 is arranged at the outer side of the coal sample chamber 6, and is connected with a flowmeter 9, a control valve 10 and a nitrogen cylinder 11 in sequence, wherein:
the flowmeter 9 is used for recording the gas flow of the nitrogen bottle 11 which is introduced into the coal sample chamber 6; the control valve 10 is used for controlling the gas circulation of the nitrogen cylinder 11;
the multi-component gas measurement system comprises a chromatographic analyzer 15 for receiving the gas from the coal sample chamber 6 and detecting the concentration of CO therein, wherein the chromatographic analyzer 15 is communicated with the gas outlet 8 of the gas inlet and outlet system;
the temperature and humidity control pre-measurement system comprises an atomizing nozzle 12, a water inlet 13, a water tank 14 and a temperature controller 16, and is used for regulating and controlling the temperature in the coal sample chamber 6 in real time, and controlling the humidity of the coal sample chamber 6 through the atomizing nozzle 12;
the atomizing nozzle 12 is positioned in the coal sample chamber 6 and is used for atomizing water and then spraying the atomized water on the upper surface of the coal sample 1 to be tested, and the atomizing nozzle 12 is connected with a water inlet 13 and a water tank 14 in sequence;
the temperature controller 16 is located outside the coal sample chamber 6 and is used for controlling the temperature in the coal sample chamber 6.
In addition, the device 100 may further include a sealing airbag 3, where the sealing airbag 3 can stretch and wrap the whole coal sample chamber 6, so as to seal the whole coal sample chamber 6, so as to ensure that the coal sample chamber 6 is completely isolated from the external gas. The sealing air bag can ensure that when the impact column causes the gas in the coal sample chamber to flow violently in the impact process, the coal sample chamber cannot generate violent pressure change.
The device 100 may further comprise a support 17 and a base 18, wherein:
the base 18 is positioned on a plane and is fixed to the support 17 to support the whole device 100.
In particular, the impact member 2 may include an impact post or an impact drill, which is used to apply an impact or impact breaking effect to the coal sample, respectively, and the impact member 2 in fig. 2 is an impact post, and fig. 3 is another schematic structural diagram of an apparatus provided in an embodiment of the present invention, and the impact member 2 in fig. 3 is an impact drill, which can rotate and impact at the same time.
It is noted that what is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
In summary, the method and the device provided by the embodiment of the invention can analyze different actions of impact crushing effect on CO generated by coal under different conditions, and explore the rule of CO generation by coal under different impact pressures, impact periods, impact areas, stress crushing effect, rotary crushing conditions and humid conditions, so that the accuracy of early prediction of spontaneous combustion of coal is improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. A method of testing for CO production by coal for impact fracture effects, the method comprising:
step 1, obtaining a coal sample to be tested by adopting a low-temperature drilling sampling method, and placing the coal sample into a closed sample tank;
step 2, rapidly taking out the coal sample in the closed sample tank, putting the coal sample into a coal sample chamber and sealing the coal sample chamber by using a sealing air bag;
step 3, rapidly flushing nitrogen into the coal sample chamber by adopting a normal pressure nitrogen flushing analysis method, and completely blowing out the original air and CO in the coal sample chamber;
step 4, setting blank control experiments and different experimental variables, performing impact experiments on the coal sample under the different experimental variables, and collecting corresponding experimental data; wherein the different experimental variables set include: impact strength, impact cycle, impact area, crushing action, crushing cutting action, and ambient moisture;
and 5, comparing and analyzing the blank control test and experimental data obtained under different experimental variable conditions, and exploring the influence of impact crushing effect on the generation of coal CO under different experimental variables.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
under the set blank control experiment condition, the coal sample is subjected to an experiment under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃ and no impact is applied, and then the degassing is realized by adopting a normal pressure nitrogen flushing analysis method, so that the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained;
under the set impact strength experimental conditions, the coal sample changes different impact strengths under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact period and the area of the impact coal sample are unchanged, the impact experiment is carried out on the coal sample, then the atmospheric pressure nitrogen-flushing analysis method is adopted to realize degassing, and the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained;
under the set impact period experiment condition, changing different impact periods of the coal sample under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃ and the impact strength is unchanged, performing impact experiments on the coal sample, and then adopting a normal pressure nitrogen flushing analysis method to realize degassing to obtain the total CO amount released by the coal sample after being placed into a coal sample chamber;
under the set impact area experiment condition, changing coal samples with different impact areas under the conditions of oxygen concentration of 0, ambient temperature of 20 ℃ and constant impact strength and period, performing impact experiments on the coal samples, and then implementing degassing by adopting a normal pressure nitrogen flushing analysis method to obtain the total CO amount released by the coal samples after being placed into a coal sample chamber;
under the set crushing effect experimental condition, the coal sample is changed into a percussion drill bit under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged, the percussion drill bit does not rotate in the impact process, impact experiments are carried out on the coal sample, then the atmospheric pressure nitrogen flushing analysis method is adopted to realize degassing, and the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained;
under the set experimental conditions of crushing and cutting actions, the coal sample is changed into a percussion drill bit under the conditions that the oxygen concentration is 0, the ambient temperature is 20 ℃, the impact strength and the period are unchanged, the drill bit rotates at a certain angular speed in the impact process, impact experiments are carried out on the coal sample, then the atmospheric pressure nitrogen flushing analysis method is adopted to realize degassing, and the total CO amount released by the coal sample after being placed into a coal sample chamber is obtained;
under the set experimental conditions of environmental moisture and crushing and cutting actions, the coal sample is changed into a percussion bit under the conditions of 0 oxygen concentration, 20 ℃ environmental temperature, impact strength and unchanged period, the percussion bit rotates at a certain angular speed in the percussion process, water spraying is carried out on the coal sample during the impact, the impact experiment is carried out on the coal sample under the conditions, and then the degassing is realized by adopting a normal pressure nitrogen impact analysis method, so that the total CO amount released by the coal sample after being placed into a coal sample room is obtained.
3. The method according to claim 2, characterized in that the impact cycle is set to 2S, 5S, 10S and 15S for a total of 10 impacts under experimental conditions of the impact cycle.
4. The method according to claim 1, wherein in the step 1, the process of obtaining the coal sample to be tested by using the low-temperature drilling sampling method is as follows:
and cooling the sampling tube by a liquid nitrogen method to ensure that the coal sample to be tested is obtained in a low-temperature environment.
5. The device for testing CO generated by coal body aiming at impact crushing effect is characterized by comprising a pressurizing rotation system, an air inlet and outlet system, a multi-component gas measurement system and a temperature and humidity control pre-measurement system, wherein:
the pressurizing and rotating system comprises an impact component, a telescopic rotating rod and a hydraulic controller, and the impact component is driven to conduct impact pressurizing and rotating crushing on the coal sample to be tested;
the impact component is connected to a telescopic rotating rod, and the telescopic rotating rod is in control connection with the hydraulic controller and can stretch and rotate up and down under the control of the hydraulic controller, so that impact pressure is applied to a coal sample to be tested or the coal sample is rotationally pressed at a certain speed;
the gas inlet and outlet system comprises a gas inlet, a gas outlet and a nitrogen cylinder, nitrogen is injected into the coal sample chamber through the nitrogen cylinder and the gas inlet, and the gas in the coal sample chamber is led into the chromatographic analyzer through the gas outlet for analysis;
the air inlet set up in the outside of coal sample room to be connected with flowmeter, control valve and nitrogen cylinder in this way, wherein:
the flowmeter is used for recording the gas flow of the nitrogen cylinder into the coal sample chamber; the control valve is used for controlling the circulation of the nitrogen cylinder gas;
the multi-component gas measurement system comprises a chromatographic analyzer, a gas inlet and outlet system and a gas outlet system, wherein the chromatographic analyzer is used for receiving gas from the coal sample chamber and detecting the concentration of CO in the gas;
the temperature and humidity control pre-measurement system comprises an atomizing nozzle, a water inlet, a water tank and a temperature controller, and is used for regulating and controlling the temperature in the coal sample chamber and displaying the temperature in real time, and controlling the humidity of the coal sample chamber through the atomizing nozzle;
the atomization nozzle is positioned in the coal sample chamber and is used for spraying water after atomizing on the upper surface of the coal sample to be tested, and the atomization nozzle is connected with a water inlet and a water tank in sequence;
the temperature controller is positioned at the outer side of the coal sample chamber and is used for regulating and controlling the temperature in the coal sample chamber.
6. The apparatus of claim 5, further comprising a sealing bladder that is collapsible to enclose the entire coal sample chamber for sealing the entire coal sample chamber to ensure complete isolation of the coal sample chamber from ambient air.
7. The apparatus of claim 5, further comprising a support frame and a base, wherein:
the base is positioned on the plane and fixed with the supporting frame to jointly support the whole device.
8. The apparatus of claim 5, wherein,
the impact component comprises an impact column or an impact drill which is used for exerting impact action or impact crushing action on the coal sample respectively, and the impact drill can rotate and impact at the same time.
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| CN201711387335.3A CN107941690B (en) | 2017-12-20 | 2017-12-20 | Method and device for testing CO generated by coal body aiming at impact crushing effect |
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| CN109025995B (en) * | 2018-09-03 | 2023-06-09 | 中国矿业大学(北京) | Underground coal body strength penetration testing device and method |
| CN111398556A (en) * | 2020-03-19 | 2020-07-10 | 华电电力科学研究院有限公司 | Device and method for determining water loss in coal crushing process |
| CN111579282A (en) * | 2020-05-28 | 2020-08-25 | 安徽理工大学 | In-situ detection method for primary CO in coal bed |
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