CN116990188A - Visual characterization method for coal gas emission quantity based on infrared radiation - Google Patents
Visual characterization method for coal gas emission quantity based on infrared radiation Download PDFInfo
- Publication number
- CN116990188A CN116990188A CN202310977655.3A CN202310977655A CN116990188A CN 116990188 A CN116990188 A CN 116990188A CN 202310977655 A CN202310977655 A CN 202310977655A CN 116990188 A CN116990188 A CN 116990188A
- Authority
- CN
- China
- Prior art keywords
- coal body
- gas
- coal
- infrared
- infrared radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 89
- 239000003034 coal gas Substances 0.000 title claims abstract description 29
- 230000000007 visual effect Effects 0.000 title claims abstract description 21
- 238000012512 characterization method Methods 0.000 title claims description 19
- 239000003245 coal Substances 0.000 claims abstract description 167
- 238000003795 desorption Methods 0.000 claims abstract description 131
- 238000001179 sorption measurement Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 24
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- 238000012800 visualization Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a visual representation method of coal gas emission quantity based on infrared radiation, and belongs to the technical field of coal mine gas emission quantity visualization. And generating a fitting equation by collecting gas desorption amounts of the infrared temperature measuring areas of the coal body and average infrared radiation temperature differences under different adsorption equilibrium pressures, establishing a relation between the average infrared temperature difference of the infrared temperature measuring areas and the gas desorption amount of the infrared temperature measuring areas, and calculating the gas desorption amount of the infrared temperature measuring areas by using the average infrared temperature difference of the infrared temperature measuring areas according to the relation. According to the method, the gas desorption amount of the coal body is obtained through the infrared temperature of the coal body, so that the gas desorption amount of the coal body is realized, the visualization of the gas desorption amount of the coal body is realized, the direct measurement of the gas desorption amount of the coal body is not needed, and the existing detection means are simplified.
Description
Technical Field
The invention relates to the technical field of coal mine gas emission quantity visualization, in particular to a coal body gas emission quantity visualization characterization method based on infrared radiation.
Background
Due to the constant exhaustion of shallow coal resources, deep coal resource exploitation has become a necessary trend. The coal seam gas occurrence environment is obviously changed from shallow part to deep part. The gas emission amount of the deep coal seam is greatly increased, and gas accidents such as gas explosion, gas poisoning, asphyxia and the like frequently occur, so that the safety production of the coal mine is greatly threatened. Therefore, the monitoring of the coal seam gas emission amount in the coal mine mining process is an effective way for preventing gas disasters. However, in the existing gas monitoring technology of the coal mine, single-point measurement is performed through a gas sensor, so that the distribution characteristics of gas emission on the whole of a tunneling head-on or stoping working face of the coal mine are difficult to reflect, and therefore a technical method capable of intuitively reflecting the distribution difference characteristics of gas emission on the mining working face of the coal mine is needed, so that the monitoring level of gas emission on the underground mining working face of the coal mine is improved, the accurate prevention and control of gas in a coal seam of the coal mine are realized, the occurrence of gas disaster accidents is reduced, and the production safety of the coal mine is ensured.
Prior art publication No. CN 208350550U: a full-automatic coal rock gas adsorption and desorption simulation test device comprises a gas adsorption system, a gas desorption system, a desorption detection system, a gas recovery tank and a computer; the gas adsorption system mainly comprises a gas storage tank, a precise electronic balance and a coal rock test piece, the gas desorption system mainly comprises a coal rock sample tank and a coal rock test piece, the desorption detection system comprises an infrared sensor, a circular foam floating plate, a Hall element, a measuring cylinder, a data transmission plate and a control circuit box, the gas adsorption system is connected with the gas desorption system through an exhaust pipe and a second control valve, the gas desorption system is connected with the desorption detection system through an exhaust pipe and a second vacuum pump, the desorption detection system is connected with the gas recovery tank through a third vacuum pump and a fourth vacuum pump, and the precise electronic balance and the data transmission plate are connected with a computer through signal transmission lines. The method can only measure the gas adsorption and desorption content, and cannot generate an intuitive graph to represent the gas emission amount of the coal body.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, a visual characterization method of the gas emission quantity of the coal body based on infrared radiation is provided, and is used for intuitively reflecting the distribution difference characteristic of the gas emission quantity of the coal body.
The technical scheme is as follows: the invention provides a visual representation method of coal gas emission quantity based on infrared radiation, which is characterized by comprising the following steps:
step 1, performing a coal gas desorption test: preparing a coal body, placing the coal body into a closed space, vacuumizing, injecting high-pressure gas into the closed space filled with the coal body to achieve adsorption balance, releasing redundant gas in the closed space, and synchronously recording gas desorption rate data and infrared radiation data of the coal body by using a flowmeter (22) and a thermal infrared imager (5); the coal body area shot by the infrared thermal imager (5) is an infrared temperature measuring area, and the infrared radiation temperature data comprise the Average Infrared Radiation Temperature (AIRT) of the coal body surface in the infrared temperature measuring area and the Infrared Radiation Temperature (IRT) of each pixel point in the infrared temperature measuring area i，j )；
Step 2, calculating the total gas desorption amount of the coal body in the infrared temperature measuring area;
step 3, calculating the gas emission quantity of the infrared temperature measuring area of the coal body according to the total gas desorption quantity of the coal body;
step 4, determining a corresponding relation between the gas desorption quantity of the coal body in the infrared temperature measuring area and the Average Infrared Radiation Temperature (AIRT) difference value on the surface of the coal body;
step 5, establishing a fitting equation between the gas desorption quantity of the infrared temperature measuring region of the coal body and the average infrared radiation temperature difference value;
step 6, repeating the steps 1 to 5, and establishing infrared measurement of the coal under different adsorption equilibrium pressuresFitting equation between the gas desorption amount of the temperature zone and the average infrared radiation temperature difference value to obtain fitting parameters between the gas desorption amount of the infrared temperature measurement zone and the average infrared radiation temperature difference value of the coal body under different adsorption balance pressures: slope k i And intercept b i ，i＝1，2，3…，n；
Step 7, pair of intercept b i Taking an average value;
step 8, establishing a slope k i Equilibrium pressure P with adsorption i Fitting equations between;
step 9, establishing a general formula of coal gas desorption amount under different adsorption equilibrium pressures based on the average infrared radiation temperature difference;
step 10, calculating the gas desorption amount of the coal body in the infrared test area by using the gas desorption amount of the coal body calculated by the general formula of the gas desorption amount of the coal body, and calculating the gas desorption amount of the coal body at each pixel point in the infrared test area of the coal body;
and 11, drawing the coal body gas desorption amount data of each pixel point in the infrared test area of the coal body into a gas desorption amount cloud chart, realizing visual characterization of the gas emission amount in the gas desorption process of the coal body, and forming a corresponding relation with the infrared radiation temperature difference cloud chart in the gas desorption process of the coal body.
Further, the method for acquiring the gas desorption rate data in the gas desorption process of the coal body comprises the following steps:
the adsorption equilibrium pressure was calculated to be P using the following i Total gas desorption amount of coal body:
wherein: q (Q) Total (S) The equilibrium pressure for adsorption is P i The total gas desorption amount of the coal body is v, the gas desorption rate of the coal body is v, and t is the gas desorption time of the coal body.
Further, the total amount Q of desorption according to the gas of the coal is utilized Total (S) Calculating the gas emission quantity Q of the infrared temperature measuring area of the coal body Pi ：
When the coal body is a cuboid sample:
when the coal body is a cylinder sample:
wherein: q (Q) Pi The equilibrium pressure for adsorption is P i And the gas desorption quantity of the infrared temperature measuring region of the coal body is i.j, namely i x j infrared radiation temperature values in the infrared temperature measuring region are tested together, wherein i.j is the number of infrared pixel points.
Further, the surface Average Infrared Radiation Temperature (AIRT) i ) Subtracting the initial Average Infrared Radiation Temperature (AIRT) 1 ) Obtaining the average infrared radiation temperature difference (delta AIRT) of the coal surface i )；
Wherein: ΔAIRT i ＝AIRT i -AIRT 1 (i＝1，2.3…，n)；
Wherein: ΔAIRT i Is the average infrared radiation temperature difference in the gas desorption process.
Further, a fitting equation between the gas desorption amount of the infrared temperature measuring region of the coal body and the average infrared radiation temperature difference value is as follows:
wherein: slope k i Intercept b i Is a fitting parameter.
Further, fitting parameter b i The average value of (2) is:
wherein:intercept b of fitting equation between gas desorption amount and average infrared radiation temperature difference value of infrared temperature measuring area of coal body under different adsorption equilibrium pressures i Average value of (2).
Further, the slope k of a fitting equation between the gas desorption amount of the infrared temperature measuring region of the coal body and the average infrared radiation temperature difference value under different adsorption equilibrium pressures i With different adsorption equilibrium pressure P i The fitting equation is established as follows:
k i ＝dP i +e
wherein: d is the slope k i With different adsorption equilibrium pressure P i The slope of the fit equation between e is the intercept.
Further, the general formula of the desorption amount of the coal gas under different adsorption equilibrium pressures based on the average infrared radiation temperature difference is:
wherein: q is adsorption equilibrium gas pressure P i The time-average infrared radiation temperature difference is delta AIRT i And (5) gas desorption amount of the coal body.
Further, the desorption quantity Q of the coal body gas at each pixel point in the infrared test area of the coal body i，j The gas desorption quantity Q of the infrared test area of the coal body is calculated:
wherein:
wherein: q (Q) i，j For the gas desorption amount, delta IRT of each pixel point in the infrared measurement zone of the coal body in the gas desorption process i，j Is the infrared radiation temperature difference of the coal body of each pixel point.
The beneficial effects are that: according to the method, the corresponding relation between the gas desorption amount in the infrared test area of the coal body and the average infrared radiation temperature difference value on the surface of the coal body is established, the general formula of the gas desorption amount of the coal body under different adsorption equilibrium pressures based on the average infrared radiation temperature difference value is calculated, the gas desorption amount of each pixel point in the infrared test area of the coal body in the gas desorption process is further obtained, and a cloud chart of the gas desorption amount of the coal body is drawn, so that the visualization of the gas desorption amount in the gas desorption process of the coal body is realized, and technical support is provided for researching the characteristic of the differential distribution of the gas emission of the coal seam of the underground mining working face of the coal mine.
Drawings
FIG. 1 is a flow chart for visualization characterization of infrared radiation based coal gas emission;
FIG. 2 is a schematic diagram of a coal gas emission test system based on infrared radiation;
FIG. 3 is a schematic diagram of pixel distribution in a coal infrared test area;
FIG. 4 is a graph of a visual calculation of the amount of gas emitted from a coal;
in the figure: 1. an infrared visible cylinder; 2. a cylinder cover; 3. a cavity; 4. a computer; 5. an infrared thermal imager; 6. pressing a shaft; 7. a coal body; 8. an infrared visible window; 9. a high pressure gas cylinder; 10. an air inlet hole; 11. an air inlet valve; 12. a pressure reducing valve; 13. an inflation line; 14. a pressure gauge; 15. a negative pressure meter; 16. 17, 18, 20. Valves; 19; a four-way valve; 21. a bleed line; 22. a flow meter; 23. a vacuumizing pipeline; 24. and a vacuum pump.
Detailed Description
The invention is further explained below with reference to the drawings.
The invention provides a visual characterization method of a coal gas emission amount based on infrared radiation, in particular to a coal gas emission amount test system (see figure 2) based on infrared radiation, which comprises a coal gas adsorption and desorption system and an infrared radiation data acquisition system; the coal gas adsorption and desorption system comprises an infrared visible cylinder body 1, a flowmeter 22, a high-pressure gas cylinder 9, a vacuum pump 24, a pressure gauge 14, a negative pressure gauge 15 and a four-way valve 19; the infrared radiation data acquisition system comprises a thermal infrared imager 5 and a notebook computer 4.
The high-pressure gas cylinder 9 is connected with the infrared visible cylinder body 1 through an inflation pipeline 13; the flowmeter 22 is connected with the infrared visible cylinder body 1 through the deflation pipeline 21 and the valve 20; the vacuum pump 24 is connected with the infrared visible cylinder body 1 through the air suction pipeline 23 and the valve 18; the pressure gauge 14 is arranged on the gas charging pipeline and is used for observing the gas pressure state of the system; the negative pressure meter 15 is arranged on the exhaust pipeline and is used for observing the vacuumizing state of the system; the four-way valve 19 is used for communicating the inflation pipeline 13, the deflation pipeline 21 and the air extraction pipeline 23; the high-pressure gas cylinder 9 is provided with a pressure reducing valve 12 for controlling the gas pressure.
The infrared visual cylinder body 1 is of a three-half locking ring quick-release structure, and comprises a cylinder body cover 2 and a cavity 3, wherein the cylinder body cover 2 and the cavity 3 are connected in a pressing mode, a sealing ring is arranged inside a connecting part to ensure tightness in sequence, and the outside is sealed through a hinge like the sealing ring. The middle of the cylinder cover 2 is provided with a pressing shaft 6 which vertically penetrates through the center of the cylinder cover and can vertically move so as to fix a sample, and a sealing rubber ring is arranged between the pressing shaft 6 and the cylinder cover 2. The infrared visible cylinder body wall is provided with an air inlet and outlet hole 10 and an infrared visible window 8. An infrared germanium glass with high infrared transmittance (> 95%) is installed at the infrared visible window 8.
The thermal infrared imager 5 is arranged right in front of the infrared visible window 8 so as to be opposite to the coal body 7 in the cylinder body.
The notebook computer 4 is provided with thermal infrared imager operation software and is connected with the thermal infrared imager 5 for collecting infrared radiation temperature data in the coal gas desorption process.
The coal body is a cuboid sample with the length of x mm, y mm and the height of z mm or a cylinder sample with the diameter of r mm and the height of h mm, and is vertically arranged in the middle of the inside of the infrared visible cylinder body 1, and one surface of the coal body is aligned with the infrared visible window 8.
The device determines the actual desorption amount of the coal body in the infrared temperature measuring region according to the integral gas desorption amount of the coal sample, then establishes the relationship between the infrared temperature in the infrared temperature measuring region and the gas desorption amount (actual measurement value) in the infrared temperature measuring region, and calculates the gas desorption amount (calculation value) in the infrared temperature measuring region by utilizing the infrared temperature in the infrared temperature measuring region according to the relationship. Therefore, the gas desorption amount of the coal body can be obtained directly through the infrared temperature of the coal body, so that the gas desorption amount of the coal body is realized, the visualization of the gas desorption amount of the coal body is realized, the direct measurement of the gas desorption amount of the coal body is not needed, and the existing detection means is simplified.
As shown in fig. 1, the visual characterization method of the coal gas emission amount based on the infrared radiation provided by the invention relates to a test of the coal gas emission amount based on the infrared radiation, and comprises the following steps:
step 1: the upper and lower ends of the coal body 7 are coated with sealant, and the sealant is vertically arranged in the middle of the infrared visible cylinder body 1, and one surface of the sealant is aligned with the infrared visible window 8;
step 2: the cylinder cover 2 is covered on the cylinder 3 and tightly pressed, and certain axial pressure is applied to the pressing shaft 6 to fix the coal body; opening the air inlet valve 11, simultaneously opening the valve 16 and the valve 18 which are connected with the vacuum pump 24 and the valve 17 which is connected with the negative pressure meter 15, closing the pressure reducing valve 12 and the valve 20 which is connected with the flowmeter 22, opening the vacuum pump 24, observing the change of the negative pressure meter 15, checking the air tightness of the cylinder body, and vacuumizing the infrared visible cylinder body 1 and related pipelines for 12 hours;
step 3: after the vacuum pumping is finished, firstly, a valve 18 communicated with a vacuum pump 24 and a valve 17 connected with a negative pressure meter 15 are closed, a pressure reducing valve 12 is opened and adjusted to preset gas pressure, gas is filled into an infrared visible cylinder body 1, the pressure meter 14 on the pressure reducing valve 12 and an inflation pipeline is observed, and after the gas pressure reaches the preset gas pressure, constant-pressure adsorption is kept for 24 hours, so that the adsorption is balanced;
step 4: after the gas adsorption time of the coal body is reached, the pressure reducing valve 12 is closed, the air outlet valve 20 is opened to release redundant gas in the cylinder body 1 and the pipeline thereof, and then the flow meter 22 is connected;
step 5: simultaneously, the flowmeter 22 and the thermal infrared imager 5 are turned on, and the data of the desorption rate of the coal gas and the data of the infrared radiation are synchronously recorded.
Step 6: and (5) repeating the steps 1-5, and testing the data of the gas desorption rate and the infrared radiation data of the coal under different adsorption equilibrium pressures.
The invention provides a visual characterization method of coal gas emission quantity based on infrared radiation, which mainly comprises the following steps:
step 1: synchronous determination of gas desorption rate data and infrared radiation temperature data of a coal body gas desorption process by using a flowmeter and an infrared thermal imager, wherein the infrared radiation temperature data comprises Average Infrared Radiation Temperature (AIRT) of the surface of the coal body in an infrared temperature measuring region and Infrared Radiation Temperature (IRT) of each pixel point in the infrared temperature measuring region i，j )；
Step 2: calculating total gas desorption amount Q of coal body by using measured gas desorption rate data Total (S) (see figure 4),
wherein:
wherein: q (Q) Total (S) The equilibrium pressure for adsorption is P i The total gas desorption amount of the coal body is mL;
v is the desorption rate of the coal gas, and mL/s;
t is the desorption time of the coal gas, s.
Step 3: according to the total gas desorption quantity Q of the coal body Total (S) Calculating the gas emission quantity Q of the infrared temperature measuring area of the coal body Pi (see fig. 4), wherein:(cuboid sample) or->(cylindrical sample) (2) formula: q (Q) Pi The equilibrium pressure for adsorption is P i The gas desorption amount of the infrared temperature measuring area of the coal body is mL;
i.j is the number of infrared pixel points, i.e. i×j infrared radiation temperature values are tested (see fig. 3).
Step 4: the surface Average Infrared Radiation Temperature (AIRT) of the coal surface measured i ) Subtracting the initial Average Infrared Radiation Temperature (AIRT) 1 ) Obtaining the average infrared radiation temperature difference (delta AIRT) of the coal surface i )，
Wherein: ΔAIRT i ＝AIRT i -AIRT 1 (i＝1，2.3…，n) (3)
Wherein: ΔAIRT i The temperature difference is the average infrared radiation temperature difference in the gas desorption process, and the temperature is DEG C;
step 5: establishing a fitting equation (see fig. 4) between the gas desorption amount of the infrared temperature measurement area of the coal body and the average infrared radiation temperature difference, namely:
wherein: k (k) i ，b i For fitting parameters, where k i Is a slope, b i Is the intercept.
Step 6: repeating the steps 1-5, and establishing a fitting equation between the gas desorption amount of the infrared temperature measurement region of the coal body and the average infrared radiation temperature difference value under different adsorption equilibrium pressures to obtain a fitting parameter k between the gas desorption amount of the infrared temperature measurement region of the coal body and the average infrared radiation temperature difference value under different adsorption equilibrium pressures i (slope) and b i (intercept), i=1, 2,3 …, n.
Step 7: for b in step 6 i Taking an average value, namely:
wherein:intercept b of fitting equation between gas desorption amount and average infrared radiation temperature difference value of infrared temperature measuring area of coal body under different adsorption equilibrium pressures i Average value of (2).
Step 8: the k obtained in the step 6 is processed i Equilibrium pressure P with adsorption i And establishing a fitting equation, namely:
k i ＝dP i +e (6)
wherein: d. e is a fitting parameter, d is a slope k i With different adsorption equilibrium pressure P i The slope of the fit equation between e is the intercept.
Step 9: substituting the formula (5) and the formula (6) into the formula (4) can obtain the general formula of the desorption amount of the coal body gas under different adsorption equilibrium pressures based on the average infrared radiation temperature difference, namely:
wherein: q is Pi, and the average infrared radiation temperature difference is DeltaAIRT i And (5) the gas desorption amount of the coal body and mL.
Step 10: calculating the gas desorption quantity Q of the coal body at each pixel point in the infrared test zone of the coal body according to the gas desorption quantity Q of the infrared test zone of the coal body calculated in the step 9 i，j ，
Wherein:
wherein: q (Q) i，j The gas desorption amount is mL for each pixel point in the infrared measurement area of the coal body in the gas desorption process;
ΔIRT i，j is the infrared radiation temperature difference value of the coal body of each pixel point, and is in DEG C.
Step 10: and (3) drawing the gas desorption quantity data of each pixel point obtained in the step (10) into a gas desorption quantity cloud chart, realizing visual characterization of the gas emission quantity in the gas desorption process of the coal body, and forming a corresponding relation with the infrared radiation temperature difference cloud chart in the gas desorption process of the coal body (see figure 4).
The above examples are provided for convenience of description of the present invention and are not to be construed as limiting the invention in any way, and any person skilled in the art will make partial changes or modifications to the invention by using the disclosed technical content without departing from the technical features of the invention.
Claims (9)
1. The visual characterization method of the coal gas emission quantity based on the infrared radiation is characterized by comprising the following steps of:
step 1, performing a coal gas desorption test: preparing coal body, placing the coal body into a closed space, vacuumizing, injecting high-pressure gas into the closed space filled with the coal body to achieve adsorption balance, releasing redundant gas in the closed space, and utilizing flowThe meter (22) and the thermal infrared imager (5) synchronously record the gas desorption rate data and the infrared radiation data of the coal body; the coal body area shot by the infrared thermal imager (5) is an infrared temperature measuring area, and the infrared radiation temperature data comprise the Average Infrared Radiation Temperature (AIRT) of the coal body surface in the infrared temperature measuring area and the Infrared Radiation Temperature (IRT) of each pixel point in the infrared temperature measuring area i,j )；
Step 2, calculating the total gas desorption amount of the coal body in the infrared temperature measuring area;
step 3, calculating the gas emission quantity of the infrared temperature measuring area of the coal body according to the total gas desorption quantity of the coal body;
step 4, determining a corresponding relation between the gas desorption quantity of the coal body in the infrared temperature measuring area and the Average Infrared Radiation Temperature (AIRT) difference value on the surface of the coal body;
step 5, establishing a fitting equation between the gas desorption quantity of the infrared temperature measuring region of the coal body and the average infrared radiation temperature difference value;
step 6, repeating the steps 1 to 5, and establishing a fitting equation between the gas desorption amount of the infrared temperature measurement area of the coal body and the average infrared radiation temperature difference value under different adsorption balance pressures to obtain fitting parameters between the gas desorption amount of the infrared temperature measurement area of the coal body and the average infrared radiation temperature difference value under different adsorption balance pressures: slope k i And intercept b i ,i＝1,2,3…,n；
Step 7, pair of intercept b i Taking an average value;
step 8, establishing a slope k i Equilibrium pressure P with adsorption i Fitting equations between;
step 9, establishing a general formula of coal gas desorption amount under different adsorption equilibrium pressures based on the average infrared radiation temperature difference;
step 10, calculating the gas desorption amount of the coal body in the infrared test area by using the gas desorption amount of the coal body calculated by the general formula of the gas desorption amount of the coal body, and calculating the gas desorption amount of the coal body at each pixel point in the infrared test area of the coal body;
and 11, drawing the coal body gas desorption amount data of each pixel point in the infrared test area of the coal body into a gas desorption amount cloud chart, realizing visual characterization of the gas emission amount in the gas desorption process of the coal body, and forming a corresponding relation with the infrared radiation temperature difference cloud chart in the gas desorption process of the coal body.
2. The visual characterization method of the gas emission amount of the coal body based on the infrared radiation according to claim 1, wherein the gas desorption rate data acquisition method of the gas desorption process of the coal body is as follows:
the adsorption equilibrium pressure was calculated to be P using the following i Total gas desorption amount of coal body:
wherein: q (Q) Total (S) The equilibrium pressure for adsorption is P i The total gas desorption amount of the coal body is v, the gas desorption rate of the coal body is v, and t is the gas desorption time of the coal body.
3. The method for visually characterizing the emission amount of gas in a coal based on infrared radiation according to claim 2, wherein the total amount Q of gas desorption in a coal is determined by the following formula Total (S) Calculating the gas emission quantity Q of the infrared temperature measuring area of the coal body Pi ：
When the coal body is a cuboid sample:
when the coal body is a cylinder sample:
wherein: q (Q) Pi The equilibrium pressure for adsorption is P i And the gas desorption quantity of the infrared temperature measuring region of the coal body is i.j, namely i x j infrared radiation temperature values in the infrared temperature measuring region are tested together, wherein i.j is the number of infrared pixel points.
4. The method for visual characterization of infrared radiation based coal gas emission as set forth in claim 3, wherein the measured coal surface average infrared radiation temperature (AIRT i ) Reduction ofDe-initiation Average Infrared Radiation Temperature (AIRT) 1 ) Obtaining the average infrared radiation temperature difference (delta AIRT) of the coal surface i )；
Wherein: ΔAIRT i ＝AIRT i -AIRT 1 (i＝1,2.3···，n)；
Wherein: ΔAIRT i Is the average infrared radiation temperature difference in the gas desorption process.
5. The visual characterization method of the infrared radiation-based coal gas emission amount according to claim 3, wherein a fitting equation between the gas desorption amount of the infrared temperature measurement area of the coal body and the average infrared radiation temperature difference value is:
wherein: slope k i Intercept b i Is a fitting parameter.
6. The visual characterization method for the emission quantity of coal gas based on infrared radiation according to claim 1, wherein the fitting parameter b is as follows i The average value of (2) is:
wherein:intercept b of fitting equation between gas desorption amount and average infrared radiation temperature difference value of infrared temperature measuring area of coal body under different adsorption equilibrium pressures i Average value of (2).
7. The visual characterization method of the infrared radiation-based coal gas emission amount according to claim 6, wherein the gas desorption amount and the average infrared radiation temperature difference of the infrared temperature measurement area of the coal under different adsorption equilibrium pressuresSlope k of fit equation between values i With different adsorption equilibrium pressure P i The fitting equation is established as follows:
k i ＝dP i +e
wherein: d is the slope k i With different adsorption equilibrium pressure P i The slope of the fit equation between e is the intercept.
8. The visual characterization method of the infrared radiation based coal gas emission amount according to claim 7, wherein the general formula of the coal gas desorption amount under different adsorption equilibrium pressures based on the average infrared radiation temperature difference is:
wherein: q is adsorption equilibrium gas pressure P i The time-average infrared radiation temperature difference is delta AIRT i And (5) gas desorption amount of the coal body.
9. The visual characterization method for the emission quantity of the coal body gas based on the infrared radiation according to claim 8, wherein the desorption quantity Q of the coal body gas of each pixel point in the infrared test area of the coal body i,j The gas desorption quantity Q of the infrared test area of the coal body is calculated:
wherein:
wherein: q (Q) i,j For the gas desorption amount, delta IRT of each pixel point in the infrared measurement zone of the coal body in the gas desorption process i,j Is the infrared radiation temperature difference of the coal body of each pixel point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310977655.3A CN116990188B (en) | 2023-08-04 | 2023-08-04 | Visual characterization method for coal gas emission quantity based on infrared radiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310977655.3A CN116990188B (en) | 2023-08-04 | 2023-08-04 | Visual characterization method for coal gas emission quantity based on infrared radiation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116990188A true CN116990188A (en) | 2023-11-03 |
| CN116990188B CN116990188B (en) | 2024-09-24 |
Family
ID=88533530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310977655.3A Active CN116990188B (en) | 2023-08-04 | 2023-08-04 | Visual characterization method for coal gas emission quantity based on infrared radiation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116990188B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2632591C1 (en) * | 2016-04-18 | 2017-10-06 | Лариса Николаевна Прокофьева | Methane in coal bed mass transfer parameters determination method |
| AU2020102549A4 (en) * | 2020-09-01 | 2020-11-19 | China University Of Mining And Technology, Beijing | Experimental platform for measuring characteristic parameters of spontaneous combustion of coal |
| CN112067496A (en) * | 2020-08-29 | 2020-12-11 | 中煤科工集团重庆研究院有限公司 | Method for determining gas desorption curve under variable temperature and pressure conditions |
| CN116242881A (en) * | 2023-02-24 | 2023-06-09 | 中国矿业大学 | Heat conduction temperature compensation method for carrying infrared response information of coal and rock crack damage |
-
2023
- 2023-08-04 CN CN202310977655.3A patent/CN116990188B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2632591C1 (en) * | 2016-04-18 | 2017-10-06 | Лариса Николаевна Прокофьева | Methane in coal bed mass transfer parameters determination method |
| CN112067496A (en) * | 2020-08-29 | 2020-12-11 | 中煤科工集团重庆研究院有限公司 | Method for determining gas desorption curve under variable temperature and pressure conditions |
| AU2020102549A4 (en) * | 2020-09-01 | 2020-11-19 | China University Of Mining And Technology, Beijing | Experimental platform for measuring characteristic parameters of spontaneous combustion of coal |
| CN116242881A (en) * | 2023-02-24 | 2023-06-09 | 中国矿业大学 | Heat conduction temperature compensation method for carrying infrared response information of coal and rock crack damage |
Non-Patent Citations (4)
| Title |
|---|
| QIUSHENG YE ET AL.: "Relationship between desorption amount and temperature variation in the process of coal gas desorption", FUEL, vol. 332, 1 October 2022 (2022-10-01), pages 1 - 10, XP087217532, DOI: 10.1016/j.fuel.2022.126146 * |
| 刘纪坤等: "含瓦斯煤解吸过程煤体温度场变化红外测量研究", 中国安全科学学报, vol. 23, no. 9, 30 September 2013 (2013-09-30), pages 107 - 111 * |
| 张超等: "基于插值计算和红外观测的煤样吸附/解吸实验研究", 煤矿安全, vol. 49, no. 10, 31 October 2018 (2018-10-31), pages 1 - 4 * |
| 田贺，"煤岩破坏红外辐射表征及采动煤体红外规律研究", 《中国优秀硕士学位论文全文数据库 基础科学辑》, 第1期, 15 January 2021 (2021-01-15), pages 24 - 40 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116990188B (en) | 2024-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107340101B (en) | Gas micro-leakage detection device and method for sealing device | |
| Li et al. | Experimental study on the infrared thermal imaging of a coal fracture under the coupled effects of stress and gas | |
| CN103674448B (en) | Control pressurer system and space capsule junction device for detecting leak rate and method | |
| CN110749434A (en) | System and method for testing pressure maintaining characteristic of pressure maintaining cabin of coring device | |
| CN109029619B (en) | Volume measuring device based on dynamic differential pressure attenuation | |
| CN110108850B (en) | Coal seam gas pressure testing system and method based on drilling sampling actual measurement | |
| CN107907273B (en) | A kind of partially sealed outer surface air-tightness detection method of product | |
| US9429493B2 (en) | Manifold assembly for a portable leak tester | |
| CN111366468B (en) | Side pressure electrical measurement test system and test method | |
| CN112485175B (en) | Rock porosity measuring method and measuring device | |
| CN105387977A (en) | Installing edge leak detection system and method for two-chamber three-pressure zone structure of aero-engine | |
| CN116990188B (en) | Visual characterization method for coal gas emission quantity based on infrared radiation | |
| CN113624654B (en) | Rock porosity measuring device and method | |
| CN117538217A (en) | Device and method for analyzing permeation and migration characteristics of helium-rich natural gas in rock | |
| CN105043920A (en) | Test method for measuring rock mass constant temperature adsorption and monitoring rock mass strain and instrument | |
| CN110553802B (en) | Leakage detection device and method for large leakage measurement | |
| JP6650734B2 (en) | Volume measurement method and airtightness / leakage test method using it | |
| CN112198083A (en) | Experimental device and method for measuring temperature change in coal adsorption and desorption process | |
| CN111323359A (en) | Device and method for measuring spontaneous imbibition of rock core of high-pressure natural gas-water system | |
| CN112284652B (en) | Airship airbag helium leakage rate detection device and detection method | |
| CN104833464A (en) | Multifunctional airtight detector and detection method thereof | |
| RU2298774C1 (en) | Method for controlling reservoir sealing tightness | |
| CN214668429U (en) | Rock sample gas permeability testing arrangement | |
| CN112611698A (en) | Rock sample gas permeability testing device and testing method | |
| CN107966252A (en) | A kind of leakage amount detector of micrometeor air seal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |