CN110593942B - Device and method for accurately and quantitatively controlling gas extraction concentration - Google Patents
Device and method for accurately and quantitatively controlling gas extraction concentration Download PDFInfo
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Abstract
The invention discloses a device and a method for accurately and quantitatively controlling gas extraction concentration, wherein based on the correlation between gas leakage of a gas extraction borehole, gas pure flow and gas extraction concentration, a gas extraction mixed gas flow change function is determined through an obtained gas pure flow exponential decay rule and a set target gas concentration; the flow of the extracted gas mixture is determined by the extraction negative pressure, the extraction negative pressure is formed by driving an anti-explosion fan blade to rotate at a high speed by a pneumatic motor, a metering pump is accurately controlled by a controller, the air quantity injected into the pneumatic motor in unit time is further controlled, the rotating speed of the pneumatic motor can be accurately regulated and controlled, and the extraction negative pressure is accurately controlled finally; the invention eliminates the continuous large-amplitude fluctuation of the gas concentration in the extraction process, and ensures that the gas concentration is kept near the target gas concentration C in the extraction process and is drained, thereby ensuring the quantitative, controllable and stable output of the extracted gas concentration and finally realizing the safe and efficient utilization of the gas.
Description
Technical Field
The invention relates to a device and a method for gas extraction, in particular to a device and a method for accurately and quantitatively controlling gas extraction concentration.
Background
Because the permeability of the Chinese coal seam is generally low, the gas extraction of the Chinese coal mine mainly takes underground gas extraction as main material. The negative pressure drainage type drainage of the dense drilling hole is used as a main underground coal bed gas drainage mode, the negative pressure drainage mainly overcomes on-way resistance and local resistance of gas flow of a pipe network, and the gas is drained to the ground at a certain speed, and existing researches show that the negative pressure drainage effect in the coal bed gas drainage has little influence on the gas drainage purity. Because negative pressure extraction is bound to accompany with the problem of external gas leakage of a pipe network and a coal seam, the gas extraction concentration is gradually reduced. At present, the gas extraction concentration of more than 90% of coal seams of a coal mine is 10% -30% in a short time, and then the gas extraction concentration is reduced, so that the gas extraction concentration of a gas pipe network is lower than 10% for a long time, and the gas explosion risk is easily induced when the gas concentration of the pipe network is 5-16% (within an explosion limit range); according to statistics, the gas extraction amount directly discharged to the atmosphere in each year reaches more than 50% of the gas extraction amount in the current year, so that not only is the resource seriously wasted, but also the greenhouse benefit is increased, and the environmental damage is caused. At present, the utilization rate of coal mine gas in China is only about 30-35%, and the analysis reasons mainly include low gas extraction concentration, fast attenuation and large fluctuation, and the problem of low grade concentration of coal mine gas extraction severely limits the efficient utilization of gas.
Therefore, the level of the gas concentration and the output of whether the extraction concentration is continuously stable determine whether the gas can be effectively used. Therefore, a method capable of eliminating the problem of continuous fluctuation of gas extraction concentration caused by gas leakage of a gas extraction drill hole and pure gas flow, so as to ensure that extracted gas is output at stable concentration and realize safe and efficient utilization of gas is needed, and the method is the research direction of the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for accurately and quantitatively controlling gas extraction concentration, which can solve the problem of continuous fluctuation of the gas extraction concentration caused by both gas leakage of a gas extraction drill hole and pure gas flow, thereby ensuring that extracted gas is output at stable concentration and realizing safe and efficient utilization of the gas.
In order to achieve the purpose, the invention adopts the technical scheme that: a device for accurately and quantitatively controlling gas extraction concentration comprises an extraction steel pipe, a fixed support, a pneumatic motor, a rotating shaft, an air inlet pipe, an air outlet pipe, a metering pump, a gas comprehensive measuring instrument, a controller, a transformer and an electric energy supply substation,
the gas extraction device comprises a fixed support, a pneumatic motor, a rotating shaft, a rotating bearing, an explosion-proof impeller, a sealing opening I, a sealing opening II and a sealing opening III, wherein the fixed support is fixed in an extraction steel pipe, the pneumatic motor is fixed on the fixed support, the output end of the pneumatic motor is positioned on the axis of the extraction steel pipe, the output end of the pneumatic motor is coaxially connected with one end of the rotating shaft, the rotating bearing is arranged on the fixed support, the other end of the rotating shaft penetrates through the rotating bearing, the outer surface of the rotating shaft is rotatably connected with the rotating bearing, the other end of the rotating shaft is provided with the explosion-proof impeller, the pipe wall of the extraction steel pipe is provided with the sealing; one end of the air outlet pipe penetrates through the sealing port II to be communicated with an air outlet of the pneumatic motor, the outer surface of the air outlet pipe is hermetically connected with the sealing port II, and the other end of the air outlet pipe is communicated with an air inlet of the metering pump;
the gas comprehensive measuring instrument is arranged in the extraction steel pipe, penetrates through the sealing port III through a transmission line and is connected with the controller, and the transmission line is in sealing connection with the sealing port III and is used for monitoring the amount and the concentration of gas mixture flowing through the extraction steel pipe;
the controller is connected with the metering pump and used for receiving data fed back by the gas comprehensive measuring instrument and controlling the gas injection amount of the metering pump;
the electric energy supply substation supplies power to the metering pump, the gas comprehensive measuring instrument and the controller through the transformer.
Furthermore, the air purifier also comprises at least one filtering device, wherein the filtering device is arranged on the air inlet pipe or the air outlet pipe, and a silica gel drying agent is arranged in the filtering device. The dust carried in the airflow discharged by the air outlet pipe can be filtered by additionally arranging the filtering device, so that a large amount of dust is prevented from being caused in a roadway; in addition, the silica gel drying agent can adsorb moisture in the air flow, so that the dryness of the air flow is ensured, and the influence of the moisture on the pneumatic motor is prevented.
Further, the controller is a PLC controller. MATLAB software and a data storage library are installed in the PLC; the data repository can store and update the data monitored in real time; MATLAB software can fit the monitored data into a curve to obtain a specific relational expression.
A working method of a device for accurately and quantitatively controlling gas extraction concentration comprises the following specific steps:
firstly, connecting extraction steel pipes in the device in series to a pipeline of a coal mine gas extraction system;
secondly, the electric energy supply substation starts to supply power to the metering pump, the gas comprehensive measuring instrument and the controller;
the controller controls the metering pump to work first, so that the air quantity injected into the pneumatic motor in unit time is the air quantity corresponding to the maximum rotating speed of the pneumatic motor, the pneumatic motor drives the explosion-proof impeller to rotate at the maximum rotating speed, then the metering pump is enabled to decrease from the air quantity at a constant speed until the pneumatic motor stops rotating, and the air quantity corresponding to 100 working condition points, namely A is [ q ] is selected in an equivalent difference manner in the period of time1,q2,q3····q100]Meanwhile, the gas comprehensive measuring instrument respectively monitors the gas extraction mixed quantity Q when the gas comprehensive measuring instrument is positioned at the 100 working condition points, and the corresponding gas extraction mixed quantity B (Q) under the 100 working condition points is obtained1,Q2,Q3····Q100]The controller utilizes the internal MATLAB software to combine the 100 groups of data
Performing linear fitting to obtain a fitting relational expression F ═ F (Q, Q) of the air quantity injected into the pneumatic motor and the extracted gas mixed gas quantity in unit time, and storing the fitting relational expression in the controller;
fourthly, inputting the set target gas concentration C into the controller;
the influence of the known extraction negative pressure on the pure gas flow can be ignored, so that the pure gas flow only continuously attenuates along with the extraction time; is provided with
The gas pure flow is extracted when the extraction time is t;
the gas pure flow rate is the gas pure flow rate during initial extraction of the drill hole; beta is a bore holeThe gas emission attenuation coefficient is as follows;
wherein the gas emission attenuation coefficient beta and the initial extraction amount of the extracted borehole
Obtained by measuring and calculating the gas extraction site, and the obtained gas attenuation coefficient beta and the initial extraction amount
Inputting the data into a controller;
after the steps are finished and before the gas extraction is started, according to the set target gas concentration C and the attenuation formula of the gas pure flow
Namely, the ideal change function Q of the gas mixture gas extraction quantity along with the extraction time can be obtained(t)。
Q(t)According to the fitting relation formula F ═ F (Q, Q) of the air quantity injected into the pneumatic motor in unit time and the extracted gas mixed gas quantity obtained in the step (c), the change function Q of the air injection quantity required by the pneumatic motor in unit time corresponding to the extraction time can be obtained(t)(ii) a The controller being dependent on a function q(t)The operation condition of the metering pump is regulated and controlled, and the gas injection quantity supply requirement required by the pneumatic motor is met in real time;
seventhly, gas extraction is started, and in the extraction process, the gas comprehensive measuring instrument is used for measuring the actual pure gas flow in the extraction steel pipe at intervals of 1min
And the current gas extraction concentrationDegree CjThe actual pure gas flow is collected and fed back to the controller, and the controller updates the monitored actual pure gas flow in time
The actual pure gas flow is obtained by MATLAB software after each update and according to the time point
Combined initial gas net flow
Fitting the pure gas flow attenuation change into a new curve again, thereby obtaining a new gas emission attenuation coefficient beta of the extracted borehole;
when the monitored gas concentration CjDetermining that the operation is normal within the range of the set target gas concentration (C-2%, C + 2%), and maintaining the current function operation at the moment; when the monitored gas concentration CjIf the gas concentration is not within the range of the set target gas concentration (C-2 percent and C +2 percent), determining that the gas is not normal to operate, updating the previous beta value of the new gas emission attenuation coefficient beta of the extracted borehole obtained in the step (C), and repeating the extraction steps from the fifth step to the seventh step to ensure that the extracted gas concentration C is higher than the preset target gas concentrationjAnd circulating until the gas extraction process of the drill hole is finished within the range of the set target gas concentration (C-2%, C + 2%).
Compared with the prior art, the method adopts a mode of combining a pneumatic motor, a metering pump, a gas comprehensive measuring instrument, a controller and an electric energy supply substation, and determines the change function of the extracted gas mixed gas flow through the obtained decay rule of the gas pure flow index and the set target gas concentration based on the correlation of the gas extraction drilling gas leakage, the gas pure flow and the extracted gas concentration; the extraction negative pressure determines the flow of extracted gas mixture, the extraction negative pressure is formed by driving an anti-explosion fan blade to rotate at a high speed by a pneumatic motor, a metering pump is accurately controlled by a controller, the air quantity injected into the pneumatic motor in unit time is further controlled, the rotating speed of the pneumatic motor can be accurately regulated and controlled, and the extraction negative pressure is accurately controlled finally; the method has the advantages that the air quantity required to be injected into the pneumatic motor in unit time can be accurately controlled according to the flow of the extracted gas mixture, the exponential decay law of the pure gas flow can be timely corrected when the gas comprehensive measuring instrument monitors that the concentration of the currently extracted gas is not in the set target gas concentration range, and then a new regulation and control function is obtained according to the new decay law, so that the gas extraction concentration is accurately and quantitatively controlled to be in the set target gas concentration range. The invention effectively eliminates the continuous fluctuation of the gas extraction concentration in the extraction process, and ensures that the gas concentration in the extraction process is kept near the target gas concentration C and is drained as far as possible, thereby ensuring the quantitative, controllable and stable output of the extracted gas concentration and finally realizing the safe and efficient utilization of the gas.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of the operation of the present invention.
In the figure: 1. the system comprises an extraction steel pipe, 2, a fixed support, 3, a rotating shaft, 4, a rotating bearing, 5, an explosion-proof impeller, 6, a pneumatic motor, 7, an air inlet pipe, 8, an air outlet pipe, 9, sealing ports I and 10, sealing ports II and 11, a metering pump, 12, a filtering device, 13, a gas comprehensive measuring instrument, 14, a transmission line, 15, sealing ports III and 16, a controller, 17, a transformer, 18 and an electric energy supply substation.
Detailed Description
The present invention will be further explained below.
As shown in the figure, the device for accurately and quantitatively controlling the gas extraction concentration comprises an extraction steel pipe 1, a fixed support 2, a pneumatic motor 6, a rotating shaft 3, an air inlet pipe 7, an air outlet pipe 8, a metering pump 11, a gas comprehensive measuring instrument 13, a controller 16, a transformer 17 and an electric energy supply substation 18,
the fixed support 2 is fixed in the extraction steel pipe 1, the pneumatic motor 6 is fixed on the fixed support 2, the output end of the pneumatic motor 6 is located on the axis of the extraction steel pipe 1, the output end of the pneumatic motor 6 is coaxially connected with one end of the rotating shaft 3, the fixed support 2 is provided with a rotating bearing 4, the other end of the rotating shaft 3 penetrates through the rotating bearing 4, the outer surface of the rotating shaft 3 is rotatably connected with the rotating bearing 4, the other end of the rotating shaft 3 is provided with an explosion-proof impeller 5, the pipe wall of the extraction steel pipe 1 is provided with a sealing port I9, a sealing port II 10 and a sealing port III 15, one end of the air inlet pipe 7 penetrates through the sealing port I9 to be communicated with an air inlet of the pneumatic motor 6, the outer surface of the air inlet pipe 7 is hermetically connected with; one end of the air outlet pipe 8 penetrates through the sealing port II 10 to be communicated with an air outlet of the pneumatic motor 6, the outer surface of the air outlet pipe 8 is hermetically connected with the sealing port II 10, and the other end of the air outlet pipe 8 is communicated with an air inlet of the metering pump 11;
the gas comprehensive measuring instrument 13 is arranged in the extraction steel pipe 1, the gas comprehensive measuring instrument 13 penetrates through the sealing opening III 15 through the transmission line 14 to be connected with the controller 16, and the transmission line 14 is in sealing connection with the sealing opening III 15 and is used for monitoring the amount and the concentration of gas mixture flowing through the extraction steel pipe 1;
the controller 16 is connected with the metering pump 11 and is used for receiving data fed back by the gas comprehensive measuring instrument 13 and controlling the gas injection amount of the metering pump 11;
the electric energy supply substation 18 supplies power to the metering pump 11, the gas comprehensive measuring instrument 13 and the controller 16 through a transformer 17.
Furthermore, the device also comprises at least one filtering device 12, wherein the filtering device 12 is arranged on the air inlet pipe 7 or the air outlet pipe 8, and a silica gel drying agent is arranged in the filtering device 12. The dust carried in the airflow discharged from the air outlet pipe 8 can be filtered by additionally arranging the filtering device 12, so that a large amount of dust is prevented from being caused in a roadway; in addition, the silica gel drying agent can adsorb moisture in the air flow, so that the dryness of the air flow is ensured, and the influence of the moisture on the pneumatic motor 6 is prevented.
Further, the controller 16 is a PLC controller. MATLAB software and a data storage library are installed in the PLC; the data repository can store and update the data monitored in real time; MATLAB software can fit the monitored data into a curve to obtain a specific relational expression.
The electric energy supply substation 18, the transformer 17, the metering pump 11, the gas comprehensive measuring instrument 13, the PLC, the filtering device 12 and the pneumatic motor 6 are all existing devices.
A working method of a device for accurately and quantitatively controlling gas extraction concentration comprises the following specific steps:
firstly, connecting the extraction steel pipes 1 in the device in series to a pipeline of a coal mine gas extraction system;
the electric energy supply substation 18 starts to supply power to the metering pump 11, the gas comprehensive measuring instrument 13 and the controller 16;
thirdly, the controller 16 controls the metering pump 11 to work first, so that the air quantity injected into the pneumatic motor in unit time is the air quantity corresponding to the maximum value of the rotating speed 6 of the pneumatic motor, at the moment, the pneumatic motor 6 drives the explosion-proof impeller 5 to rotate at the maximum rotating speed, then the metering pump 11 is enabled to decrease at a constant speed from the air quantity until the pneumatic motor 6 stops rotating, and the air quantity corresponding to 100 working condition points, namely A is [ q ] is selected in the equivalent difference in the period of time1,q2,q3····q100]Meanwhile, the gas comprehensive measuring instrument 13 monitors the gas extraction mixed quantity Q at the 100 working points respectively to obtain the corresponding gas extraction mixed quantity B ═ Q at the 100 working points1,Q2,Q3····Q100]The controller 16 utilizes internal MATLAB software to group the 100 sets of data
Performing linear fitting to obtain a fitting relational expression F ═ F (Q, Q) of the amount of air injected into the pneumatic motor 6 and the amount of gas mixture extracted in a unit time, and storing the fitting relational expression in the controller 16;
fourthly, inputting the set target gas concentration C into the controller 16;
the influence of the known extraction negative pressure on the pure gas flow can be ignored, so that the pure gas flow only continuously attenuates along with the extraction time; is provided with
The gas pure flow is extracted when the extraction time is t;
the gas pure flow rate is the gas pure flow rate during initial extraction of the drill hole; beta is aObtaining the following formula for the gas emission attenuation coefficient of the drilled hole;
wherein the gas emission attenuation coefficient beta and the initial extraction amount of the extracted borehole
Obtained by measuring and calculating the gas extraction site, and the obtained gas attenuation coefficient beta and the initial extraction amount
Input into the controller 16;
after the steps are finished and before the gas extraction is started, according to the set target gas concentration C and the attenuation formula of the gas pure flow
Namely, the ideal change function Q of the gas mixture gas extraction quantity along with the extraction time can be obtained(t)。
Q(t)According to the fitting relation formula F ═ F (Q, Q) of the air quantity injected into the pneumatic motor in unit time and the extracted gas mixed gas quantity obtained in the step (c), the change function Q of the air injection quantity required by the pneumatic motor in unit time corresponding to the extraction time can be obtained(t)(ii) a The controller being dependent on a function q(t)The operation condition of the metering pump is regulated and controlled, and the gas injection quantity supply requirement required by the pneumatic motor is met in real time;
and seventhly, gas extraction is started, and in the extraction process, because the gas emission attenuation coefficient beta changes along with the extraction process, the actual pure gas flow in the extraction steel pipe 1 is measured by the gas comprehensive measuring instrument 13 every 1min
And the current gas extraction concentration CjThe actual gas pure flow is collected and fed back to the controller 16, and the controller 16 updates the monitored actual gas pure flow in time
The actual pure gas flow is obtained by MATLAB software after each update and according to the time point
Combined initial gas net flow
Fitting the pure gas flow attenuation change into a new curve again, thereby obtaining a new gas emission attenuation coefficient beta of the extracted borehole;
when the monitored gas concentration CjDetermining that the operation is normal within the range of the set target gas concentration (C-2%, C + 2%), and maintaining the current function operation at the moment; when the monitored gas concentration CjIf the gas concentration is not within the range of the set target gas concentration (C-2 percent and C +2 percent), the operation is determined to be abnormal, the controller 16 updates the previous beta value of the new gas emission attenuation coefficient beta of the extracted borehole obtained in the step (C), and then repeats the extraction steps from the fifth step to the seventh step to ensure that the extracted gas concentration C is higher than the preset target gas concentrationjAnd circulating until the gas extraction process of the drill hole is finished within the range of the set target gas concentration (C-2%, C + 2%).
Although the method and apparatus of the present invention have been described in detail, the invention is not limited to the details of the foregoing embodiments, and various modifications may be made within the scope of the technical spirit of the invention.
Claims (4)
1. A device for accurately and quantitatively controlling gas extraction concentration is characterized by comprising an extraction steel pipe (1), a fixed support (2), a pneumatic motor (6), a rotating shaft (3), an air inlet pipe (7), an air outlet pipe (8), a metering pump (11), a gas comprehensive measuring instrument (13), a controller (16), a transformer (17) and an electric energy supply substation (18),
the gas extraction device is characterized in that a fixed support (2) is fixed in an extraction steel pipe (1), a pneumatic motor (6) is fixed on the fixed support (2), the output end of the pneumatic motor (6) is located on the axis of the extraction steel pipe (1), the output end of the pneumatic motor (6) is coaxially connected with one end of a rotating shaft (3), a rotating bearing (4) is arranged on the fixed support (2), the other end of the rotating shaft (3) penetrates through the rotating bearing (4), the outer surface of the rotating shaft (3) is rotatably connected with the rotating bearing (4), an explosion-proof impeller (5) is arranged at the other end of the rotating shaft (3), a sealing opening I (9), a sealing opening II (10) and a sealing opening III (15) are formed in the pipe wall of the extraction steel pipe (1), one end of a gas inlet pipe (7) penetrates through the sealing opening I (9) to be communicated with a gas inlet of the pneumatic motor (6), and the outer surface of the, the other end of the air inlet pipe (7) is communicated with an air outlet of the metering pump (11); one end of the air outlet pipe (8) penetrates through the sealing port II (10) to be communicated with an air outlet of the pneumatic motor (6), the outer surface of the air outlet pipe (8) is hermetically connected with the sealing port II (10), and the other end of the air outlet pipe (8) is communicated with an air inlet of the metering pump (11);
the gas comprehensive measuring instrument (13) is arranged in the extraction steel pipe (1), the gas comprehensive measuring instrument (13) penetrates through the sealing port III (15) through a transmission line (14) to be connected with the controller (16), and the transmission line (14) is in sealing connection with the sealing port III (15) and is used for monitoring the gas mixed gas amount flowing through the extraction steel pipe (1) and the gas extraction concentration;
the controller (16) is connected with the metering pump (11) and is used for receiving data fed back by the gas comprehensive measuring instrument (13) and controlling the gas injection amount of the metering pump (11);
the electric energy supply substation (18) supplies power to the metering pump (11), the gas comprehensive measuring instrument (13) and the controller (16) through a transformer (17).
2. The device for accurately and quantitatively controlling the gas extraction concentration according to claim 1, further comprising at least one filtering device (12), wherein the filtering device (12) is installed on the gas inlet pipe (7) or the gas outlet pipe (8), and a silica gel desiccant is arranged in the filtering device (12).
3. The device for accurately and quantitatively controlling the gas extraction concentration according to claim 1, wherein the controller (16) is a PLC (programmable logic controller).
4. The working method of the device for accurately and quantitatively controlling the gas extraction concentration according to claim 1 is characterized by comprising the following specific steps:
firstly, connecting the extraction steel pipe (1) in the device in series to a pipeline of a coal mine gas extraction system;
secondly, the electric energy supply substation (18) starts to supply power to the metering pump (11), the gas comprehensive measuring instrument (13) and the controller (16);
thirdly, the controller (16) controls the metering pump (11) to work firstly, so that the air quantity injected into the pneumatic motor in unit time is the air quantity corresponding to the maximum value of the rotating speed (6) of the pneumatic motor, at the moment, the pneumatic motor (6) drives the explosion-proof impeller (5) to rotate at the maximum rotating speed, then the metering pump (11) is enabled to decrease at a constant speed from the air quantity until the pneumatic motor (6) stops rotating, and the air quantity corresponding to 100 working condition points, namely A ═ q ═ is selected in equivalent difference in the period of time1,q2,q3····q100]Meanwhile, the gas comprehensive measuring instrument (13) respectively monitors the gas mixed gas quantity Q at the 100 working points, and obtains the gas mixed gas quantity Q under the corresponding 100 working points, namely B ═ Q [ Q ]1,Q2,Q3····Q100]The controller (16) utilizes internal MATLAB software to group the 100 sets of data
Performing linear fitting to obtain a fitting relational expression F ═ F (Q, Q) of the air quantity injected into the pneumatic motor (6) and the extracted gas mixed gas quantity in unit time, and storing the fitting relational expression in the controller (16);
fourthly, inputting the set target gas extraction concentration C into the controller (16);
the influence of the known extraction negative pressure on the pure gas flow can be ignored, so that the pure gas flow only continuously attenuates along with the extraction time; is provided with
The gas pure flow is extracted when the extraction time is t;
the gas pure flow rate is the gas pure flow rate during initial extraction of the drill hole; beta is the gas emission attenuation coefficient of the drilled hole, and the following formula is obtained;
wherein the gas emission attenuation coefficient beta of the extracted borehole and the gas pure flow during the initial extraction of the borehole
Obtained by measuring and calculating the gas extraction site, and the obtained gas emission attenuation coefficient beta and the gas pure flow during the initial extraction of the drill hole
Input into a controller (16);
after the steps are finished and before the gas extraction work is started, according to the set target gas extraction concentration C and the attenuation formula of the gas pure flow
Namely, the ideal change function Q of the gas mixture gas extraction quantity along with the extraction time can be obtained(t)；
Q(t)According to the fitting relation formula F ═ F (Q, Q) of the air quantity injected into the pneumatic motor in unit time and the extracted gas mixed gas quantity obtained in the step (c), the change function Q of the air injection quantity required by the pneumatic motor in unit time corresponding to the extraction time can be obtained(t)(ii) a The controller being dependent on a function q(t)The operation condition of the metering pump is regulated and controlled, and the gas injection quantity supply requirement required by the pneumatic motor is met in real time;
and seventhly, gas extraction is started, and in the extraction process, the actual pure gas flow in the extraction steel pipe (1) is measured by the gas comprehensive measuring instrument (13) at intervals of 1min
And the current gas extraction concentration CjThe actual gas pure flow is collected and fed back to the controller (16), and the controller (16) updates the monitored actual gas pure flow in time
The actual pure gas flow is obtained by MATLAB software after each update and according to the time point
Combined with pure gas flow during initial extraction of drill hole
Fitting the pure gas flow attenuation change into a new curve again, thereby obtaining a new gas emission attenuation coefficient beta of the extracted borehole;
as monitored gas extraction concentration CjDetermining that the operation is normal within the range of the set target gas extraction concentration of C-2% -C + 2%, and maintaining the current function operation at the moment; as monitored gas extraction concentration CjIf the gas extraction concentration is not within the range of C-2% -C + 2% of the set target gas extraction concentration, the operation is determined to be abnormal, the controller (16) updates the previous beta value of the new gas extraction borehole gas emission attenuation coefficient beta obtained in the step (C), and then repeats the extraction steps from the fifth step to the seventh step to enable the gas extraction concentration C to be within the range of C-2% -C + 2% of the set target gas extraction concentrationjAnd circulating the steps until the gas extraction process of the drill hole is finished within the range of the set target gas extraction concentration of C-2% -C + 2%.
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| CN201911030134.7A CN110593942B (en) | 2019-10-28 | 2019-10-28 | Device and method for accurately and quantitatively controlling gas extraction concentration |
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| CN201911030134.7A CN110593942B (en) | 2019-10-28 | 2019-10-28 | Device and method for accurately and quantitatively controlling gas extraction concentration |
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| CN110593942B true CN110593942B (en) | 2021-02-05 |
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