CN111579316B - Portable sampling instrument for mine gas sampling and control method - Google Patents
Portable sampling instrument for mine gas sampling and control method Download PDFInfo
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- CN111579316B CN111579316B CN202010413212.8A CN202010413212A CN111579316B CN 111579316 B CN111579316 B CN 111579316B CN 202010413212 A CN202010413212 A CN 202010413212A CN 111579316 B CN111579316 B CN 111579316B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
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Abstract
The invention discloses a portable sampling instrument for sampling mine gas and a control method. The portable sampling instrument is small in size, each device is easy to assemble and disassemble, convenient to carry and simple to operate, can be well adapted to underground conditions of a coal mine, solves the problem of sampling ultra-low concentration gas to a target concentration at each underground place of the coal mine, can realize successive adsorption of original sample gas and improvement of gas concentration gradient in a plurality of gas storage tanks aiming at original sample gas containing ultra-low concentration gas until the gas concentration of a gas sample reaches the acquisition requirement, and is particularly suitable for sampling gas at underground places of the coal mine such as a goaf, a coal face upper corner, a return airway, a fracture zone and the like.
Description
Technical Field
The invention relates to a gas sampling instrument and a control method, in particular to a portable sampling instrument and a control method which are suitable for sampling ultra-low concentration gas with the concentration of less than 1 percent at underground coal mine places such as a goaf, an upper corner of a coal face, an air return roadway, a fissure zone and the like, and belongs to the technical field of prevention and control of coal mine gas disasters and efficient development.
Background
Coal bed gas is commonly called as 'gas', is hydrocarbon gas which is stored in a coal bed, takes methane as a main component, is mainly adsorbed on the surface of coal matrix particles, partially dissociates in coal pores or is dissolved in coal bed water, is an associated mineral resource of coal, and belongs to unconventional natural gas. When the air concentration of the coal bed gas reaches 5-16%, the coal bed gas can explode when encountering open fire, which is the root cause of coal mine gas explosion accidents. In consideration of the health and safety problems of workers, the coal mine safety regulation stipulates that the concentration of gas in a return air roadway of an underground coal mining working face of a coal mine is not higher than 1%. Due to the underground ventilation requirement of the coal mine and the like, the gas concentration of the upper corners, the fissure zones, the goafs and other places of the coal face is basically lower than 1%.
With the development of science and technology and the requirements on mine safety, related analysis and test on mine gas are required. The traditional method is that different gas samples are collected at different places under a mine by a gas sampling instrument, and then the gas samples are analyzed and tested. In consideration of the accuracy and reliability of test results, most analysis means have high requirements on gas concentration, for example, isotope analysis coal bed gas tracing technology requires that the gas concentration in a gas sample is more than 10%. And aiming at ultra-low concentration gas with the concentration of less than 1% in coal mine underground places such as goafs, upper corners of coal mining working faces, return air tunnels, fracture zones and the like, samples obtained by direct sampling cannot be directly used for analysis and testing.
Disclosure of Invention
In order to solve the problems, the invention provides a portable sampling instrument for sampling mine gas and a control method thereof, which can sample the coal bed gas containing the gas with the concentration lower than 1% and synchronously prepare and produce gas samples meeting the analysis and test requirements on the premise of sampling the coal bed gas which meets the analysis and test requirements and contains high-concentration gas, and are particularly suitable for sampling the gas in underground coal mine places such as a goaf, an upper corner of a coal face, a return airway, a fracture zone and the like.
In order to achieve the purpose, the portable sampling instrument for sampling the mine gas comprises a raw material gas source collecting port, a multi-way valve group I, a vacuum pump I, a three-way reversing valve, a sample gas collecting device and a sample gas preparation device;
the multi-way valve group I comprises n +1 input ports and an output port, the n +1 input ports are respectively communicated and connected with the output port through a stop valve I, a raw material gas source collecting port is communicated and connected with one input port of the multi-way valve group I, the output port of the multi-way valve group I is communicated and connected with the input end of a vacuum pump I, the output end of the vacuum pump I is connected with a sample gas collecting device and a sample gas preparation device through a three-way reversing valve, the output end of the sample gas collecting device is provided with a check valve, the output end of the vacuum pump I is also provided with a gas concentration detector, and a flow control valve is further arranged on a passage through which the three-;
the sample gas preparation device comprises a gas adsorption part and a gas storage part; the gas adsorption part comprises an adsorption tank, an adsorbent which preferentially adsorbs oxygen and/or nitrogen is filled in the adsorption tank, the input end of the adsorption tank is communicated and connected with the output end of the flow control valve through a stop valve II, the output end of the adsorption tank is communicated and connected with the input end of a vacuum pump II through a stop valve III, and a gas pressure detector is further arranged on the output end of the adsorption tank; the gas storage part comprises a multi-way valve group II and n gas storage tanks, the multi-way valve group II comprises an input port and n output ports, the n output ports are respectively communicated and connected with the input port through a stop valve IV, the input port of the multi-way valve group II is communicated and connected with the output end of a vacuum pump II, the input end of the n gas storage tanks is respectively communicated and connected with the n output ports of the multi-way valve group II in sequence, the output ends of the n gas storage tanks are respectively communicated and connected with other input ports of the multi-way valve group I, and the volumes of the first gas storage tank to the nth.
As a further improvement scheme of the invention, the portable sampling instrument for sampling mine gas further comprises an electric control device, wherein the electric control device comprises a controller, a multi-way valve group control loop, a vacuum pump control loop, a gas concentration judgment loop and a sample gas preparation switching control loop, the stop valve I, the three-way reversing valve, the stop valve II, the flow control valve, the stop valve III and the stop valve IV are all electromagnetic control valves, the gas concentration detector is a gas concentration sensor, the gas pressure detector is a gas pressure sensor, and the controller is respectively and electrically connected with the stop valve I, the three-way reversing valve, the stop valve II, the flow control valve, the stop valve III, the stop valve IV, the gas concentration sensor and the gas pressure sensor.
As a further improvement of the invention, a gas pressure detector is provided at the output of at least the first gas tank.
As a further improvement scheme of the invention, the adsorption tanks are arranged in a plurality, the input ends of the adsorption tanks are respectively communicated and connected with the output end of the flow control valve through a stop valve II, the output ends of the adsorption tanks are respectively communicated and connected with the input end of a vacuum pump II through a stop valve III, and the output ends of the adsorption tanks are respectively provided with a gas pressure detector.
As a further improvement scheme of the invention, the specification of the adsorption tank is a stainless steel pipe or a PVC pipe with the inner diameter of 0.5-3 cm and the length of 0.3-0.6 m.
As a further improvement of the invention, the gas storage tank is a gas collecting bag or a gas bag with a flexible structure.
A control method of a portable sampling instrument for sampling mine gas specifically comprises the following steps:
a. sampling preparation: firstly, controlling a stop valve I corresponding to a raw material gas source collecting port on a multi-way valve group I to be in an open state, controlling the rest stop valves I to be in a closed state, controlling a three-way reversing valve to enable three passages of the three-way reversing valve to be in a closed state, controlling a stop valve II to be in an open state, controlling a stop valve III to be in a closed state, and controlling all stop valves IV of the multi-way valve group II to be in a closed state;
b. gas sampling: starting a vacuum pump I, and executing the step b-1 when the gas concentration in the original gas fed back by a gas concentration detector on the output end of the vacuum pump I is greater than the set sampling concentration value; when the gas concentration in the original gas fed back by the gas concentration detector on the output end of the vacuum pump I is less than or equal to the set sampling concentration value, executing the step b-2;
b-1, controlling a three-way reversing valve to enable the output end of the vacuum pump I to be in a communication state with a sample gas collecting device, and enabling original sample gas to enter the sample gas collecting device for collecting and sealing samples;
b-2, after adjusting the output flow of the flow control valve to a set range, controlling a three-way reversing valve to enable the output end of a vacuum pump I and a sample gas preparation device to be in a communicated state, enabling original sample gas to enter an adsorption tank, after a gas pressure detector on the output end of the adsorption tank feeds back the absolute pressure in the adsorption tank to reach a set pressure value, firstly closing a stop valve II and the vacuum pump I, opening a stop valve III and a stop valve IV on a multi-way valve set II corresponding to a first gas storage tank, starting the vacuum pump II, enabling the gas sample adsorbed for the first time to enter the first gas storage tank, after a set time, firstly closing the stop valve IV and the vacuum pump II on the multi-way valve set II corresponding to the first gas storage tank, then closing the stop valve I corresponding to a raw material gas source acquisition port on the multi-way valve set I, opening the stop valve I corresponding to the first gas, Opening a stop valve II, and finally starting a vacuum pump I;
if the gas concentration in the gas sample which completes the first-time adsorption after being fed back by the gas concentration detector on the output end of the vacuum pump I is larger than the set sampling concentration value, controlling the three-way reversing valve to enable the output end of the vacuum pump I and the sample gas collecting device to be in a communicated state, and enabling the gas sample which completes the first-time adsorption to enter the sample gas collecting device for collecting and sealing;
if the gas concentration in the gas sample after the first-time adsorption is fed back by the gas concentration detector on the output end of the vacuum pump I is smaller than or equal to the set sampling concentration value, controlling the three-way reversing valve to enable the output end of the vacuum pump I and the sample gas preparation device to be in a communicated state, enabling the gas sample after the first-time adsorption to re-enter the adsorption tank for second-time adsorption, closing the stop valve II and the vacuum pump I after the absolute pressure in the adsorption tank fed back by the gas pressure detector on the output end of the adsorption tank reaches a second set pressure value, opening the stop valve IV on the multi-way valve set II corresponding to the second gas storage tank, starting the vacuum pump II, enabling the gas sample after the second-time adsorption to enter the second gas storage tank, and so on, sequentially adsorbing original gas containing ultralow-concentration gas and realizing gas concentration gradient improvement in n gas storage tanks until the gas concentration in the original-shape gas fed back by the After the sampling concentration value is determined, the three-way reversing valve is controlled to enable the output end of the vacuum pump I and the sample gas collecting device to be in a communicated state, and the adsorbed gas sample enters the sample gas collecting device to be collected and sealed.
As a further improvement of the invention, a gas pressure detector is arranged on the output end of at least the first gas storage tank; in the step b-2, after the gas sample which is adsorbed for the first time enters the first gas storage tank, the step of injecting original gas into the adsorption tank for adsorption is repeated, and the gas sample which is adsorbed is injected into the first gas storage tank until the absolute pressure value in the first gas storage tank fed back by the gas pressure detector on the output end of the first gas storage tank reaches a set value.
As a further improvement scheme of the invention, a plurality of adsorption tanks are arranged, the input ends of the adsorption tanks are respectively communicated and connected with the output end of the flow control valve through a stop valve II, the output ends of the adsorption tanks are respectively communicated and connected with the input end of a vacuum pump II through a stop valve III, and the output ends of the adsorption tanks are respectively provided with a gas pressure detector; in the step b-2, firstly controlling all the stop valves II to be in a closed state, then controlling the three-way reversing valve to enable the output end of the vacuum pump I to be in a communicated state with the sample gas preparation device, and finally opening the stop valves II one by one according to a set time interval, wherein original gas enters different adsorption tanks in sequence according to the set time interval; after the first adsorption tank finishes the absorption, close the stop valve II of first adsorption tank, open the stop valve III of first adsorption tank and the stop valve IV on the multichannel valves II that correspond first gas holder after starting vacuum pump II, accomplish absorbent gaseous sample and get into first gas holder promptly in first adsorption tank, subsequent adsorption tank finishes absorbing the back and closes respective stop valve II one by one, open respective stop valve III that corresponds, close vacuum pump I at last, subsequent absorbent gaseous sample of completion gets into first gas holder in proper order and makes first gas holder be in and be full of the state.
As a further improvement of the invention, the output flow range of the flow control valve in the step b-2 is 0.5-5L/min.
Compared with the prior art, the portable sampling instrument for sampling the mine gas has small volume, easy assembly and disassembly of all devices, convenient carrying and simple operation, can well adapt to the underground condition of a coal mine, and solves the sampling problem that the ultralow-concentration gas is separated to the target concentration at each underground place of the coal mine; since the sample gas preparation device is provided with the gas adsorption part, oxygen and/or nitrogen in the original gas can be adsorbed by the adsorbent which preferentially adsorbs oxygen and/or nitrogen in the adsorption tank, so that separation and concentration of the original gas are realized, and the gas concentration of the original gas is improved; the sample gas preparation device is provided with the gas storage part comprising the plurality of gas storage tanks with sequentially decreasing volumes, so that a closed circulation system for improving the gas concentration gradient in the gas sample can be formed, and by matching with the gas adsorption part, the original sample gas containing ultralow-concentration gas can be gradually adsorbed, and the gas concentration gradient improvement in the plurality of gas storage tanks can be realized until the gas concentration of the gas sample reaches the acquisition requirement.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. raw materials air supply gathers mouthful, 2, multichannel valves I, 3, vacuum pump I, 4, three-way reversing valve, 5, the gaseous collection system of sample, 6, the gaseous preparation facilities of sample, 61, adsorption tank, 62, stop valve II, 63, stop valve III, 64, vacuum pump II, 65, multichannel valves II, 66, gas holder, 7, flow control valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the portable sampling instrument for sampling mine gas comprises a raw material gas source collecting port 1, a multi-way valve group I2, a vacuum pump I3, a three-way reversing valve 4, a sample gas collecting device 5 and a sample gas preparation device 6.
The multi-way valve group I2 comprises n +1 input ports and an output port, the n +1 input ports are respectively communicated and connected with the output port through a stop valve I, a raw material gas source collecting port 1 is communicated and connected with one input port of the multi-way valve group I2, the output port of the multi-way valve group I2 is communicated and connected with the input end of a vacuum pump I3, the output end of the vacuum pump I3 is connected with a sample gas collecting device 5 and a sample gas preparation device 6 through a three-way reversing valve 4, the vacuum pump I3 can be used underground of a coal mine, the miniature electric vacuum pump or the hand-operated vacuum pump with the explosion-proof function is characterized in that the output end of the sample gas collecting device 5 is provided with a check valve, the output end of the vacuum pump I3 is also provided with a gas concentration detector, and a passage where the three-way reversing valve 4 is connected with the sample gas preparation device 6 is also provided with a flow control valve 7.
The sample gas preparation device 6 comprises a gas adsorption part and a gas storage part; the gas adsorption part comprises an adsorption tank 61, an adsorbent which preferentially adsorbs oxygen and/or nitrogen is filled in the adsorption tank 61, the oxygen and/or nitrogen is adsorbed preferentially to gas due to the adsorption balance effect of the adsorbent, the gas can be separated by utilizing the adsorbed time difference of each gas, the adsorption tank 61 can be a stainless steel pipe or a PVC pipe with the inner diameter of 0.5-3 cm and the length of 0.3-0.6 m, the input end of the adsorption tank 61 is communicated and connected with the output end of the flow control valve 7 through a stop valve II 62, the output end of the adsorption tank 61 is communicated and connected with the input end of a vacuum pump II 64 through a stop valve III 63, and the output end of the adsorption tank 61 is also provided with a gas pressure detector; the gas storage part comprises a multi-way valve group II 65 and n gas storage tanks 66, the multi-way valve group II 65 comprises an input port and n output ports, the n output ports are respectively communicated and connected with the input port through a stop valve IV, the input port of the multi-way valve group II 65 is communicated and connected with the output end of the vacuum pump II 64, the input ends of the n gas storage tanks 66 are respectively communicated and connected with the n output ports of the multi-way valve group II 65 in sequence, the output ends of the n gas storage tanks 66 are respectively communicated and connected with other input ports of the multi-way valve group I, and the volumes of the first air storage tank 66 to the nth air storage tank 66 are sequentially decreased according to the gradient of the adsorption proportion, the volumes of the air storage tanks 66 are sequentially decreased to realize the step-by-step gradient concentration of the gas in the raw material gas, in order to reduce the volume, the air storage tank 66 may be a flexible, foldable and sealed structure such as an air collecting bag or an air bag.
Taking the example that the gas concentration in a gas sample required by an isotope analysis coal bed gas traceability technology is more than 10%, before the portable sampling instrument for mine gas sampling is used for collecting a gas sample under a mine, firstly, a stop valve I corresponding to a raw material gas source collecting port 1 on a multi-way valve set I2 is controlled to be in an open state, the rest stop valves I are controlled to be in a closed state, a three-way reversing valve 4 is controlled to enable three passages of the three-way reversing valve to be in a closed state, a stop valve II 62 is controlled to be in an open state, a stop valve III 63 is controlled to be in a closed state, all stop valves IV of a multi-way valve set II 65 are controlled to be in a closed state, then a vacuum pump I3 is started, original gas containing gas passes through the raw material gas source collecting port 1 and the multi-way valve set I2 under the action of negative pressure and then is gathered at the output end of the vacuum pump I3, when, controlling the three-way reversing valve 4 to enable the output end of the vacuum pump I3 to be in a communication state with the sample gas collecting device 5, and enabling original sample gas to enter the sample gas collecting device 5 for collecting and sealing samples;
when the gas concentration in the original gas fed back by the gas concentration detector at the output end of the vacuum pump I3 is less than or equal to 10%, adjusting the output flow of the flow control valve 7 to be between 0.5 and 5 liters/minute, controlling the three-way reversing valve 4 to enable the output end of the vacuum pump I3 to be in a communication state with the sample gas preparation device 6, enabling the original gas to enter the adsorption tank 61, adsorbing the oxygen and/or nitrogen in the original gas under the adsorption action of an adsorbent which preferentially adsorbs the oxygen and/or nitrogen, increasing the gas concentration in the original gas, when the absolute pressure in the adsorption tank 61 fed back by the gas pressure detector at the output end of the adsorption tank 61 reaches 0.01, determining that the adsorption is completed, closing the stop valve II 62 and the vacuum pump I3, opening the stop valve III 63 and the stop valve IV on the multi-way valve group II 65 corresponding to the first gas storage tank 66, and then starting the vacuum pump II, the gas sample which finishes the first adsorption enters a first gas storage tank 66 under the action of negative pressure, after the set time, a stop valve IV and a vacuum pump II 64 on a multi-way valve set II 65 corresponding to the first gas storage tank 66 are closed, a stop valve I on a multi-way valve set I2 corresponding to a raw material gas source acquisition port 1 is closed, a stop valve I on a multi-way valve set I2 corresponding to the first gas storage tank 66 is opened, a three-way reversing valve 4 is controlled to enable three passages to be in a closed state, a stop valve II 62 is opened, finally a vacuum pump I3 is started, the gas sample which finishes the first adsorption passes through the multi-way valve set I2 under the action of negative pressure and then is gathered at the output end of the vacuum pump I3, if the gas concentration in the gas sample which finishes the first adsorption by a gas concentration detector on the output end of the vacuum pump I3 is fed back to be more than 10%, the three-way reversing valve 4 is, the gas sample which finishes the first adsorption enters a sample gas collecting device 5 for collecting and sealing, if the gas concentration in the gas sample which finishes the first adsorption is fed back by a gas concentration detector on the output end of a vacuum pump I3 and is less than or equal to 10 percent, the steps are repeated, a three-way reversing valve 4 is controlled to enable the output end of the vacuum pump I3 to be in a communication state with a sample gas preparation device 6, the gas sample which finishes the first adsorption enters an adsorption tank 61 again for carrying out the second adsorption, when the absolute pressure in the adsorption tank 61 fed back by a gas pressure detector on the output end of the adsorption tank 61 reaches a second set pressure value, the adsorption is considered to be finished, at the moment, a stop valve II 62 and the vacuum pump I3 are closed firstly, a stop valve IV on a multi-way valve set II 65 corresponding to a second gas storage tank 66 is opened, then a vacuum pump II 64 is started, and the gas sample which finishes the second, by analogy, original sample gas containing ultralow-concentration gas is successively adsorbed and the gas concentration gradient is improved in the n gas storage tanks 66 until the gas concentration in the original sample gas fed back by the gas concentration detector at the output end of the vacuum pump I3 is more than 10%, the three-way reversing valve 4 is controlled to enable the output end of the vacuum pump I3 to be communicated with the sample gas collecting device 5, and a gas sample enters the sample gas collecting device 5 to be collected and sealed.
When the number of the gas containers 66 is set to 4, and the volumes of the 4 gas containers 66 are respectively set to 50 liters, 20 liters, 5 liters and 0.2 liter, 100 liters of the raw gas containing 0.5% gas can be subjected to cyclic adsorption concentration, and then about 0.2 liter of sample gas containing about 10% gas can be obtained.
In order to realize automatic collection and sample sealing, as a further improvement scheme of the invention, the portable sampling instrument for mine gas sampling further comprises an electric control device, wherein the electric control device comprises a controller, a multi-way valve group control loop, a vacuum pump control loop, a gas concentration judgment loop and a sample gas preparation switching control loop, the stop valve I, the three-way reversing valve 4, the stop valve II 62, the flow control valve 7, the stop valve III 63 and the stop valve IV are all electromagnetic control valves, the gas concentration detector is a gas concentration sensor, the gas pressure detector is a gas pressure sensor, and the controller is respectively and electrically connected with the stop valve I, the three-way reversing valve 4, the stop valve II 62, the flow control valve 7, the stop valve III 63, the stop valve IV, the gas concentration sensor and the gas pressure sensor.
In order to achieve a better gas concentration gradient enhancement effect of the gas sample in the gas storage tanks 66, as a further improvement of the present invention, a gas pressure detector is provided at the output end of at least the first gas storage tank 66. After the gas sample which finishes the first adsorption enters the first gas holder 66, because oxygen and/or nitrogen in the gas sample are adsorbed, the volume of the gas sample which finishes the adsorption is reduced, the absolute pressure value fed back into the first gas holder 66 by the gas pressure detector at the output end of the first gas holder 66 is smaller, at this time, the step of injecting the original gas into the adsorption tank 61 for adsorption can be repeated, and the gas sample which finishes the adsorption is injected into the first gas holder 66, until the absolute pressure value fed back into the first gas holder 66 by the gas pressure detector at the output end of the first gas holder 66 reaches the set value (that is, the first gas holder 66 is in a full state).
In order to achieve a better gas concentration gradient improvement effect of the gas sample in the gas storage tank 66, as a further improvement scheme of the present invention, a plurality of (2 shown in fig. 1) adsorption tanks 61 are provided, input ends of the plurality of adsorption tanks 61 are respectively connected to an output end of the flow control valve 7 through a stop valve ii 62, output ends of the plurality of adsorption tanks 61 are respectively connected to an input end of a vacuum pump ii 64 through a stop valve iii 63, and output ends of the plurality of adsorption tanks 61 are further provided with gas pressure detectors. When the gas concentration in original gas fed back by a gas concentration detector on the output end of the vacuum pump I3 is less than or equal to 10%, firstly controlling all the stop valves II 62 to be in a closed state, then controlling the three-way reversing valve 4 to enable the output end of the vacuum pump I3 and the sample gas preparation device 6 to be in a communicated state, and finally sequentially opening the stop valves II 62 one by one according to a set time interval, wherein the original gas sequentially enters different adsorption tanks 61 according to the set time interval; after the first adsorption tank 61 finishes adsorption, close II 62 of the stop valve of the first adsorption tank 61, open III 63 of the stop valve of the first adsorption tank 61 and the stop valve IV on the multi-way valve group II 65 corresponding to the first gas storage tank 66 and then start II 64 of the vacuum pump, the gas sample which finishes adsorption in the first adsorption tank 61 enters the first gas storage tank 66, after the subsequent adsorption tank 61 finishes adsorption, close II 62 of the respective corresponding stop valve one by one, open III 63 of the respective corresponding stop valve, finally close I3 of the vacuum pump, and after that, the gas sample which finishes adsorption sequentially enters the first gas storage tank 66 to enable the first gas storage tank 66 to be in a full-up state, thereby realizing continuous adsorption operation and gas storage operation.
The portable sampling instrument for sampling mine gas can realize high-pressure leakage early warning by monitoring the pressure value in the leakage pressure monitoring space 24, and avoid the situations that plugging fails and the high-pressure capsule assembly 1 is accidentally separated under the action of high-pressure water injection or gas injection reaction force; the high-pressure capsule component 1 can be separated from the resistance-increasing component 2 after being contracted and reset to realize recycling, so that the safety, reliability and economy of high-pressure water injection or gas injection operation of the coal seam can be greatly improved.
The portable sampling instrument for sampling the mine gas is small in size, easy to assemble and disassemble, convenient to carry and simple to operate, can be well adapted to underground conditions of a coal mine, solves the problem of separating ultra-low concentration gas into target concentration in various underground places of the coal mine, and is particularly suitable for sampling the gas in underground places of the coal mine such as a goaf, an upper corner of a coal face, an air return lane, a fissure zone and the like.
Claims (10)
1. A portable sampling instrument for sampling mine gas comprises a raw material gas source collecting port (1), a vacuum pump I (3), a sample gas collecting device (5) and a controller, and is characterized by further comprising a multi-way valve group I (2), a three-way reversing valve (4) and a sample gas preparation device (6);
the multi-way valve group I (2) comprises n +1 input ports and an output port, the n +1 input ports are respectively communicated and connected with the output port through a stop valve I, a raw material gas source collecting port (1) is communicated and connected with one input port of the multi-way valve group I (2), the output port of the multi-way valve group I (2) is communicated and connected with the input end of a vacuum pump I (3), the output end of the vacuum pump I (3) is connected with a sample gas collecting device (5) and a sample gas preparation device (6) through a three-way reversing valve (4), the output end of the sample gas collecting device (5) is provided with a check valve, the output end of the vacuum pump I (3) is further provided with a gas concentration detector, and a flow control valve (7) is further arranged on a passage for connecting the three-way reversing valve (4) and the sample;
the sample gas preparation device (6) comprises a gas adsorption part and a gas storage part; the gas adsorption part comprises an adsorption tank (61), an adsorbent which preferentially adsorbs oxygen and/or nitrogen is filled in the adsorption tank (61), the input end of the adsorption tank (61) is communicated and connected with the output end of the flow control valve (7) through a stop valve II (62), the output end of the adsorption tank (61) is communicated and connected with the input end of a vacuum pump II (64) through a stop valve III (63), and the output end of the adsorption tank (61) is also provided with a gas pressure detector; the air storage part comprises a multi-way valve group II (65) and n air storage tanks (66), the multi-way valve group II (65) comprises an input port and n output ports, the n output ports are respectively communicated and connected with the input port through a stop valve IV, the input port of the multi-way valve group II (65) is communicated and connected with the output end of the vacuum pump II (64), the input ends of the n air storage tanks (66) are respectively communicated and connected with the n output ports of the multi-way valve group II (65) in sequence, the output ends of the n air storage tanks (66) are respectively communicated and connected with other input ports of the multi-way valve group I (2), and the volumes of the first air storage tank (66) to the nth air storage tank (66;
the controller is respectively electrically connected with each stop valve IV of each stop valve I, the vacuum pump I (3), the gas concentration detector, the three-way reversing valve (4), the flow control valve (7), the stop valve II (62), the stop valve III (63), the vacuum pump II (64), the gas pressure detector and the multi-way valve group II (65) of the multi-way valve group I (2).
2. The portable sampling instrument for mine gas sampling of claim 1, the portable sampling instrument for sampling mine gas also comprises an electric control device, the electric control device comprises a controller, a multi-way valve group control loop, a vacuum pump control loop, a gas concentration judgment loop and a sample gas preparation switching control loop, the stop valve I, the three-way reversing valve (4), the stop valve II (62), the flow control valve (7), the stop valve III (63) and the stop valve IV are all electromagnetic control valves, the gas concentration detector is a gas concentration sensor, the gas pressure detector is a gas pressure sensor, and the controller is electrically connected with the stop valve I, the three-way reversing valve (4), the stop valve II (62), the flow control valve (7), the stop valve III (63), the stop valve IV, the gas concentration sensor and the gas pressure sensor respectively.
3. A portable sampler for mine gas sampling as claimed in claim 1 or claim 2 characterised in that the output of at least the first reservoir (66) is provided with a gas pressure probe.
4. The portable sampling instrument for mine gas sampling according to claim 1 or 2, wherein the adsorption tanks (61) are provided in plurality, the input ends of the adsorption tanks (61) are respectively connected with the output end of the flow control valve (7) through a stop valve II (62), the output ends of the adsorption tanks (61) are respectively connected with the input end of a vacuum pump II (64) through a stop valve III (63), and the output ends of the adsorption tanks (61) are respectively provided with a gas pressure detector.
5. The portable sampling instrument for mine gas sampling according to claim 1 or 2, wherein the adsorption tank (61) is a stainless steel pipe or a PVC pipe with an inner diameter of 0.5-3 cm and a length of 0.3-0.6 m.
6. The portable sampler for mine gas sampling according to claim 1 or 2 wherein the gas storage tank (66) is a flexible structured gas collection pocket or bladder.
7. The control method of the portable sampling instrument for mine gas sampling according to claim 1, characterized by comprising the following steps:
a. sampling preparation: firstly, controlling a stop valve I corresponding to a raw material gas source collecting port (1) on a multi-way valve group I (2) to be in an open state, controlling the rest stop valves I to be in a closed state, controlling a three-way reversing valve (4) to enable three passages of the three-way reversing valve to be in a closed state, controlling a stop valve II (62) to be in an open state, controlling a stop valve III (63) to be in a closed state, and controlling all stop valves IV of a multi-way valve group II (65) to be in a closed state;
b. gas sampling: starting a vacuum pump I (3), and executing the step b-1 when the gas concentration in the original gas fed back by a gas concentration detector on the output end of the vacuum pump I (3) is greater than a set sampling concentration value; when the gas concentration in the original gas fed back by the gas concentration detector at the output end of the vacuum pump I (3) is less than or equal to the set sampling concentration value, executing the step b-2;
b-1, controlling a three-way reversing valve (4) to enable the output end of a vacuum pump I (3) to be in a communicated state with a sample gas collecting device (5), and enabling original sample gas to enter the sample gas collecting device (5) for collecting and sealing samples;
b-2, after the output flow of the flow control valve (7) is adjusted to a set range, controlling a three-way reversing valve (4) to enable the output end of a vacuum pump I (3) to be in a communication state with a sample gas preparation device (6), enabling original gas to enter an adsorption tank (61), when a gas pressure detector at the output end of the adsorption tank (61) feeds back the absolute pressure in the adsorption tank (61) to reach a set pressure value, firstly closing a stop valve II (62) and the vacuum pump I (3), opening a stop valve III (63) and a stop valve IV on a multi-way valve group II (65) corresponding to a first gas storage tank (66), then starting a vacuum pump II (64), enabling the gas sample adsorbed for the first time to enter the first gas storage tank (66), and after the set time, firstly closing the stop valve IV and the vacuum pump II (64) on the multi-way valve group II (65) corresponding to the first gas, then closing a stop valve I corresponding to the raw material gas source collecting port (1) on the multi-way valve group I (2), opening a stop valve I corresponding to a first gas storage tank (66) on the multi-way valve group I (2), controlling a three-way reversing valve (4) to enable three passages to be in a closed state, opening a stop valve II (62), and finally starting a vacuum pump I (3);
if the gas concentration in the gas sample which is fed back by the gas concentration detector on the output end of the vacuum pump I (3) and completes the first adsorption is larger than the set sampling concentration value, controlling the three-way reversing valve (4) to enable the output end of the vacuum pump I (3) to be in a communicated state with the sample gas collecting device (5), and enabling the gas sample which completes the first adsorption to enter the sample gas collecting device (5) to be collected and sealed;
if the gas concentration in the gas sample which is fed back by the gas concentration detector at the output end of the vacuum pump I (3) and is completely adsorbed for the first time is smaller than or equal to the set sampling concentration value, the three-way reversing valve (4) is controlled to enable the output end of the vacuum pump I (3) to be in a communicated state with the sample gas preparation device (6), the gas sample which is completely adsorbed for the first time enters the adsorption tank (61) again for the second time of adsorption, after the absolute pressure in the adsorption tank (61) fed back by the gas pressure detector at the output end of the adsorption tank (61) reaches the second set pressure value, the stop valve II (62) and the vacuum pump I (3) are closed firstly, the stop valve IV on the multi-way valve set II (65) corresponding to the second gas storage tank (66) is opened, then the vacuum pump II (64) is started, the gas sample which is completely adsorbed, original gas containing ultralow-concentration gas is adsorbed successively, gas concentration gradient improvement is achieved in n gas storage tanks (66), until the gas concentration in the original gas fed back by a gas concentration detector on the output end of the vacuum pump I (3) is larger than a set sampling concentration value, the three-way reversing valve (4) is controlled to enable the output end of the vacuum pump I (3) to be communicated with the sample gas collecting device (5), and an adsorbed gas sample enters the sample gas collecting device (5) to be collected and sealed.
8. The method of claim 7, wherein the output of at least the first reservoir (66) is provided with a gas pressure sensor;
in the step b-2, after the gas sample which finishes the first adsorption enters the first gas storage tank (66), the step of injecting the original gas into the adsorption tank (61) for adsorption is repeated, and the gas sample which finishes the adsorption is injected into the first gas storage tank (66) until the absolute pressure value in the first gas storage tank (66) fed back by the gas pressure detector at the output end of the first gas storage tank (66) reaches the set value.
9. The control method of the portable sampling instrument for the mine gas sampling according to the claim 7, characterized in that a plurality of adsorption tanks (61) are provided, the input ends of the adsorption tanks (61) are respectively communicated and connected with the output end of the flow control valve (7) through a stop valve II (62), the output ends of the adsorption tanks (61) are respectively communicated and connected with the input end of a vacuum pump II (64) through a stop valve III (63), and the output ends of the adsorption tanks (61) are respectively provided with a gas pressure detector;
in the step b-2, firstly controlling all the stop valves II (62) to be in a closed state, then controlling the three-way reversing valve (4) to enable the output end of the vacuum pump I (3) to be in a communicated state with the sample gas preparation device (6), finally opening the stop valves II (62) one by one in sequence according to a set time interval, and enabling original gas to enter different adsorption tanks (61) in sequence according to the set time interval; after first adsorption tank (61) accomplished the absorption, close stop valve II (62) of first adsorption tank (61), open stop valve III (63) of first adsorption tank (61) and the stop valve IV on the multichannel valves II (65) that correspond first gas holder (66) after start vacuum pump II (64), accomplish absorbent gas sample and get into first gas holder (66) promptly in first adsorption tank (61), subsequent adsorption tank (61) accomplish and close respective corresponding stop valve II (62) one by one after adsorbing, open respective corresponding stop valve III (63), close vacuum pump I (3) at last, subsequent absorbent gas sample of accomplishing gets into first gas holder (66) in proper order and makes first gas holder (66) be in and be full of the state.
10. The control method of the portable sampling instrument for mine gas sampling according to claim 7, characterized in that the output flow rate of the flow control valve (7) in the step b-2 is in the range of 0.5-5L/min.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692492A (en) * | 1971-02-08 | 1972-09-19 | Mine Safety Appliances Co | Apparatus for measuring carbon monoxide and total hydrocarbons in gas sample |
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | The pressure swing adsorption and staged concentrated method of a kind of low concentration gas |
| CN102359895A (en) * | 2011-08-15 | 2012-02-22 | 西北核技术研究所 | Normal temperature enrichment and sampling method for xenon in air, and apparatus thereof |
| CN106053289A (en) * | 2016-07-18 | 2016-10-26 | 河南理工大学 | Measurement device for adsorption and desorption of multi-element gas |
| CN106731936A (en) * | 2017-01-07 | 2017-05-31 | 河南工程学院 | A kind of coal mine underground gas configuration experimental provision for automatically controlling |
| CN110394029A (en) * | 2019-08-22 | 2019-11-01 | 阳泉煤业（集团）有限责任公司 | A kind of coal mine light concentration mash gas pressure-changed adsorption concentrating methane system and device |
| CN110542623A (en) * | 2019-09-24 | 2019-12-06 | 中国矿业大学 | Automatic measuring device and method for gas content of coal seam in coal mine |
| CN210514293U (en) * | 2019-07-16 | 2020-05-12 | 中煤能源研究院有限责任公司 | Automatic coal seam gas content measuring device |
-
2020
- 2020-05-15 CN CN202010413212.8A patent/CN111579316B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692492A (en) * | 1971-02-08 | 1972-09-19 | Mine Safety Appliances Co | Apparatus for measuring carbon monoxide and total hydrocarbons in gas sample |
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | The pressure swing adsorption and staged concentrated method of a kind of low concentration gas |
| CN102359895A (en) * | 2011-08-15 | 2012-02-22 | 西北核技术研究所 | Normal temperature enrichment and sampling method for xenon in air, and apparatus thereof |
| CN106053289A (en) * | 2016-07-18 | 2016-10-26 | 河南理工大学 | Measurement device for adsorption and desorption of multi-element gas |
| CN106731936A (en) * | 2017-01-07 | 2017-05-31 | 河南工程学院 | A kind of coal mine underground gas configuration experimental provision for automatically controlling |
| CN210514293U (en) * | 2019-07-16 | 2020-05-12 | 中煤能源研究院有限责任公司 | Automatic coal seam gas content measuring device |
| CN110394029A (en) * | 2019-08-22 | 2019-11-01 | 阳泉煤业（集团）有限责任公司 | A kind of coal mine light concentration mash gas pressure-changed adsorption concentrating methane system and device |
| CN110542623A (en) * | 2019-09-24 | 2019-12-06 | 中国矿业大学 | Automatic measuring device and method for gas content of coal seam in coal mine |
Non-Patent Citations (1)
| Title |
|---|
| 煤矿瓦斯检测方法的技术分析;洪卫东;《淮南职业技术学院学报》;20101215;25-28 * |
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