CN112081619A - Coal mine underground coal seam gas extraction regulation and control system and regulation and control method - Google Patents
Coal mine underground coal seam gas extraction regulation and control system and regulation and control method Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 136
- 239000003245 coal Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000009471 action Effects 0.000 claims abstract description 32
- 238000003745 diagnosis Methods 0.000 claims abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 9
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- 230000001133 acceleration Effects 0.000 claims description 3
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- 230000005484 gravity Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 2
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- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention relates to a coal mine underground coal seam gas extraction regulation and control system and a regulation and control method. The regulation and control method comprises the following steps: collecting extraction parameters and valve state parameters of a specific underground place; fault diagnosis, namely judging whether the extraction pipeline is in fault or not, and performing fault alarm on the fault; judging a regulation and control mode; outputting a regulation and control command; the action execution module executes the action. The invention can monitor the extraction parameters and the valve state parameters in real time, can automatically diagnose the extraction pipeline faults based on the extraction parameters, and can realize the remote regulation and control of the extraction pipeline by taking compressed air as power.
Description
Technical Field
The invention relates to the technical field of coal bed gas extraction, in particular to a regulation and control system and a regulation and control method suitable for a coal bed gas extraction pipeline under a coal mine.
Background
The underground coal bed gas development at the present stage is generally carried out by adopting an extraction system, the coal bed gas is conveyed to the ground from underground by utilizing an extraction pipeline, due to the fact that the coal bed gas is non-uniform and the physical characteristics of the coal bed gas change under the influence of factors such as mining activity and the like, extraction parameters are in a dynamic change state, the extraction parameter is timely adjusted to obtain the optimal extraction effect, and the extraction system has very important significance, and the requirement for remote and automatic control of the coal bed gas extraction pipeline is met because the extraction parameter adjusted by manual machinery cannot meet the timeliness and accuracy of the extraction parameter. Some related achievements for the extraction pipeline control device exist in China, but the existing coal bed gas extraction pipeline mostly adopts a manual or electric control mode, but a power cable is not laid in a main return airway, a special return airway and a mechanically lifted air inlet inclined roadway (not including an upper part and a lower part of a conveyor), so that the application range of the electric control mode of the extraction pipeline is limited, and the electric and manual modes for controlling the extraction pipeline have great limitation; on the other hand, the monitoring data of the existing coal mine coal bed gas extraction monitoring system is not effectively utilized, data support is only provided for manual decision, and for realizing digitization and intellectualization of the coal bed gas extraction system, remote regulation and control of a coal mine coal bed gas extraction pipeline under complex conditions need to be realized; in addition, the conventional coal mine underground coal bed gas extraction system is poor in fault resistance, cannot quickly and accurately judge after faults such as gas leakage, blockage and the like occur, and the invention provides a coal mine underground coal bed gas extraction regulation and control system and a regulation and control method in order to solve the technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coal mine underground coal seam gas extraction regulation and control system and a regulation and control method, which can realize real-time monitoring of extraction parameters and valve state parameters, can automatically diagnose extraction pipeline faults based on the extraction parameters, and can realize remote regulation and control of an extraction pipeline by taking compressed air as power.
A coal seam gas extraction regulation and control system in a coal mine comprises a data acquisition module, a data display module, a data processing module and an action execution module, wherein the data acquisition module consists of an extraction parameter acquisition part fixed on an extraction pipeline and a valve state acquisition part connected with an extraction pipeline valve, the data processing module is respectively in communication connection with the data acquisition module and the action execution module, the data processing module processes data transmitted by the data acquisition module and displays the data through the data display module, the action execution module consists of a controller, a pneumatic control valve, a power execution part and a power transmission part, the power execution part and the power transmission part are both fixed on a valve body of the extraction pipeline valve, and a compressed air pipeline is connected with the power execution part through the pneumatic control valve, the power execution part converts the pressure energy of the compressed gas into mechanical energy and generates rotary motion, the rotary motion is transmitted to the extraction pipeline valve through the power transmission part to control the valve to act, and the controller controls the pneumatic control valve to act according to the information transmitted by the data processing module.
Furthermore, the extraction parameter acquisition component is a single sensor or a combination of a plurality of sensors capable of acquiring extraction negative pressure, gas flow, methane concentration, carbon monoxide concentration and environmental temperature parameters.
Further, the valve state acquisition part is a single sensor or a combination of a plurality of sensors capable of acquiring the valve opening degree parameter.
Furthermore, the extraction parameter acquisition part is fixed on an underground extraction pipeline through a gas-entraining device or a gas-water separation device in a welding mode.
Furthermore, the input end of the pneumatic control valve is connected with a compressed air pipeline in the coal mine, and the output ends of the pneumatic control valve are two and are respectively connected with the air inlet and the air outlet of the power execution component.
A coal mine underground coal seam gas extraction regulation and control method is characterized by comprising the following steps:
step 1, collecting extraction parameters and valve state parameters of an underground specified place through a data collection module;
step 2, carrying out fault diagnosis according to the data acquired by the data acquisition module, judging whether the extraction pipeline has faults or not, if the faults are found, carrying out fault alarm, if the faults are not found, entering step 3, and carrying out the fault diagnosis specifically comprises the following steps:
step 21, collecting extraction negative pressure and gas flow values of each measuring point of an extraction pipeline, and numbering according to the distance between the measuring point and an extraction pump station from near to farAnd respectively recording the extraction negative pressure and gas flow value of the ith measuring point as PiAnd Qi；
Step 22, analyzing whether a fault exists between the ith measuring point and the (i + 1) th measuring point of the extraction pipeline by adopting a deviation index method, and judging the type of the fault;
step 23, entering a next measuring point, replacing i with i +1, returning to step 22 to judge the fault type of the next position until i is the number of the last measuring point;
step 3, selecting a regulation and control mode from two modes of automatic control and manual control of a ground computer;
step 4, the controller outputs a regulation and control command;
and 5, executing the action by an action execution module, wherein the specific execution mode is as follows:
step 51, the controller outputs a command to the pneumatic control valve;
step 52, the pneumatic control valve is opened, the power execution unit converts the pressure energy of the compressed gas into mechanical energy and generates rotary motion, and the rotary motion is transmitted to the extraction pipeline valve through the power transmission unit
And 53, the extraction pipeline valve acts until the valve opening reaches a preset value, and the pneumatic control valve is closed.
Further, the ground automatic control regulation and control method in the step 3 comprises the following steps:
b1, detecting the concentration of carbon monoxide of the gas in the extraction pipeline, if the concentration of the carbon monoxide is smaller than a set value, executing the step B2, otherwise, executing the step B4;
b2, detecting the methane concentration of the gas in the extraction pipeline, executing the step B5 if the methane concentration is smaller than a set value, otherwise executing the step B3;
b3, detecting the gas flow in the extraction pipeline, if the gas flow is smaller than a set value, executing the step B6, otherwise, stopping;
step B4, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening is 0, and stopping;
step B5, executing action 1 of the pneumatic control device, reducing the opening of the valve until the concentration of methane reaches a set value, and stopping;
and step B6, executing the action 2 of the pneumatic control device, increasing the opening of the valve until the gas flow reaches a set value, and stopping.
Further, the manual control regulation and control method in the step 3 comprises the following steps:
step C1, inputting a valve opening set value;
c2, judging the opening degree of the valve, if the opening degree of the valve is larger than a set value, executing the step C3, if the opening degree of the valve is smaller than the set value, executing the step C4, otherwise, stopping;
step C3, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening reaches a set value, and stopping;
and step C4, executing the action 2 of the pneumatic control device, increasing the valve opening until the valve opening reaches a set value, and stopping.
Further, in step 22, the deviation index method includes the following processes:
step A1, calculating a negative pressure deviation index delta P and a gas flow deviation index delta Q by adopting the following formulas:
ΔP＝||Pi-Pi+1|-H|
ΔQ＝|Qi-Qi+1|
in the formula, H is the resistance of an extraction pipeline, Pa; k is a radical of1Is the local resistance coefficient; delta is the equivalent absolute roughness of the inner wall of the pipeline; d is the inner diameter of the circular pipeline, and for the non-circular pipeline, the equivalent diameter is cm; upsilon is the kinematic viscosity of the gas in the pipeline, m2/s；QiGas flow, m, monitored for the ith measurement point3/h；XiThe length m of the pipeline between the ith measuring point and the extraction pump is; xi+1The length m of the pipeline between the (i + 1) th measuring point and the extraction pump is; rho is the density of gas in the pipeline, kg/m3(ii) a g is the acceleration of gravity, m/s2；hi、hi+1Respectively the horizontal elevation of the ith measuring point and the (i + 1) th measuring point，m；
Step A2, analyzing the fault type, and setting the extraction negative pressure deviation threshold value as1The gas flow deviation threshold value is2If Δ P is not less than1And Δ Q is not less than2If the fault type is diagnosed as pipeline leakage; if Δ P is not less than1And Δ Q <2If the fault type is diagnosed as pipeline blockage; if the other condition is the case, the diagnosis is no fault.
Further, in step S1, the valve state parameter is a valve opening, and the value range is 0 to 90 °, and the collection of the valve opening parameter is realized by the valve state collecting component.
Has the advantages that: the invention can effectively solve the problems of difficult regulation and control of the underground coal mine extraction pipeline and low manual valve regulation efficiency, can carry out automatic fault diagnosis while monitoring the extraction parameters and the valve state parameters, breaks the limitation that the electric valve cannot be used in an underground return airway of the coal mine, and can realize remote regulation and control of the extraction pipeline by taking compressed air as power.
Drawings
FIG. 1 is a schematic diagram of a coal mine underground coal bed gas extraction regulation and control system of the invention;
FIG. 2 is a flow chart of a coal mine underground coal bed gas extraction regulation and control method of the invention;
FIG. 3 is a flow chart of the method for realizing underground coal bed gas extraction regulation and control by adopting an automatic calculation mode;
FIG. 4 is a flow chart of the method for achieving underground coal bed gas extraction regulation and control by adopting a manual delivery mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
A coal seam gas extraction regulation and control system in a coal mine comprises a data acquisition module, a data display module, a data processing module and an action execution module, wherein the data acquisition module consists of an extraction parameter acquisition part fixed on an extraction pipeline and a valve state acquisition part connected with an extraction pipeline valve, the data processing module is respectively in communication connection with the data acquisition module and the action execution module, the data processing module processes data transmitted by the data acquisition module and displays the data through the data display module, the action execution module consists of a controller, a pneumatic control valve, a power execution part and a power transmission part, the power execution part and the power transmission part are both fixed on a valve body of the extraction pipeline valve, and a compressed air pipeline is connected with the power execution part through the pneumatic control valve, the power execution part converts the pressure energy of the compressed gas into mechanical energy and generates rotary motion, the rotary motion is transmitted to the extraction pipeline valve through the power transmission part to control the valve to act, and the controller controls the pneumatic control valve to act according to the information transmitted by the data processing module.
In order to collect all parameters capable of meeting the functions of the coal-bed gas extraction regulation and control system under the coal mine, the extraction parameter collecting component is a single sensor or a combination of a plurality of sensors capable of collecting extraction negative pressure, gas flow, methane concentration, carbon monoxide concentration and environment temperature parameters.
In order to accurately acquire the valve opening, the valve state acquisition part is a single sensor or a combination of a plurality of sensors capable of acquiring the valve opening parameter.
The sensor combination selected in the field implementation can be a rotary encoder and a limit switch, the rotary encoder is fixed on a valve rod of the valve and is consistent with the valve rod in the axial direction, and the rotary encoder detects the valve opening by calculating the number of electric pulses generated by the rotation of the rotary motion transmitted by the power transmission part; the limit switch sets up 2, and limit switch and rotary encoder cooperation realize the timing that valve control state detected.
In order to improve the extraction parameter acquisition precision and the anti-interference capability, the extraction parameter acquisition part is fixed on an extraction pipeline of a specific underground place through an air entraining device, a gas-water separation device or other auxiliary devices and can be fixed by welding or other reliable modes.
The controller of the power execution module selected in the field practical application can adopt a PLC (programmable logic controller), and is generally manufactured into an underground substation with an explosion-proof function for being suitable for the underground environment of a coal mine. The pneumatic control device comprises a power execution part, a power transmission part and a pneumatic control device, wherein the power execution part and the power transmission part are fixed on a valve body of the extraction pipeline valve together.
The input end of the pneumatic control valve is connected with a compressed air pipeline under a coal mine, and the output ends of the pneumatic control valves are respectively connected with the air inlet and the air outlet of the power execution component.
As shown in fig. 2, the method for regulating and controlling gas extraction of the coal seam in the coal mine comprises the following steps:
s1, collecting the extraction parameters and the valve state parameters of the specific underground place;
s2, diagnosing faults, and judging whether the extraction pipeline is in fault;
s3, performing fault alarm;
s4, judging a regulation and control mode;
s5, outputting a regulation and control command;
s6, the action execution module executes the action.
In the step S1, the extraction parameters comprise extraction negative pressure, gas flow, methane concentration, carbon monoxide concentration and environment temperature, and the extraction parameters are acquired by means of an extraction parameter acquisition component arranged on an extraction pipeline at a specific underground place.
In step S1, the valve state parameter is a valve opening degree, the valve opening degree represents an opening angle of the valve, a value range is 0 to 90 °, and the collection of the valve opening degree parameter is realized by the valve state collection component.
As shown in fig. 2, the method for determining whether the extraction pipeline is faulty or not in step S2 includes the following steps:
s21, collecting extraction negative pressure and gas flow values of each measuring point of the extraction pipeline, numbering the values from near to far according to the distance between the measuring point and an extraction pump station, and recording the extraction negative pressure and the mixed flow value of the ith measuring point as Pi、Qi；
S22, analyzing whether a fault exists between the ith measuring point and the (i + 1) th measuring point of the extraction pipeline by adopting a deviation index method, and judging the type of the fault;
and S23, replacing i with i +1, and returning to the step 2 to judge the fault type of the next position until i is the last measuring point number.
In step S22, the deviation index method includes the following steps:
a1, calculating a negative pressure deviation index delta P and a gas flow deviation index delta Q by the following formulas:
ΔP＝||Pi-Pi+1|-H|
ΔQ＝|Qi-Qi+1|
in the formula, H is the resistance of an extraction pipeline, Pa; k is a radical of1Is the local resistance coefficient; delta is the equivalent absolute roughness of the inner wall of the pipeline; d is the inner diameter of the circular pipeline, and for the non-circular pipeline, the equivalent diameter is cm; upsilon is the kinematic viscosity of the gas in the pipeline, m2/s；QiGas flow, m, monitored for the ith measurement point3/h；XiThe length m of the pipeline between the ith measuring point and the extraction pump is; xi+1Is as followsThe distance between the measuring point i +1 and the pipeline length of the extraction pump is m; rho is the density of gas in the pipeline, kg/m3(ii) a g is the acceleration of gravity, m/s2；hi、hi+1The horizontal elevation m of the ith measuring point and the (i + 1) th measuring point are respectively.
A2, analyzing the fault type, and setting the extraction negative pressure deviation threshold value as1The gas flow deviation threshold value is2If Δ P is not less than1And Δ Q is not less than2If the fault type is diagnosed as pipeline leakage; if Δ P is not less than1And Δ Q <2If the fault type is diagnosed as pipeline blockage; if the other condition is the case, the diagnosis is no fault.
In step S4, the command is selected from automatic calculation and manual assignment.
As shown in fig. 3, the flow for realizing the regulation and control of the underground coal bed gas extraction pipeline by adopting the automatic calculation mode may include the following processes:
b1, detecting the carbon monoxide concentration of the gas in the extraction pipeline, if the carbon monoxide concentration is smaller than a set value, executing the step B2, otherwise, executing the step B4;
b2, detecting the methane concentration of the gas in the extraction pipeline, if the methane concentration is less than a set value, executing the step B5, otherwise, executing the step B3;
b3, detecting the gas flow in the extraction pipeline, if the gas flow is less than a set value, executing the step B6, otherwise, stopping;
b4, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening is 0, and stopping;
b5, executing action 1 of the pneumatic control device, reducing the opening of the valve until the concentration of methane reaches a set value, and stopping;
b6, executing the action 2 of the pneumatic control device, increasing the valve opening until the gas flow reaches the set value, and stopping.
The flow for realizing the pneumatic control of the underground coal bed gas extraction pipeline by adopting the ground automatic control mode is a period, and the period interval can be manually set.
As shown in fig. 4, the process of adjusting and controlling the underground coal bed gas extraction pipeline by using the artificial discharging method may include the following steps:
c1, inputting a valve opening set value;
c2, judging the valve opening, if the valve opening is larger than the set value, executing the step C3, if the valve opening is smaller than the set value, executing the step C4, otherwise, stopping;
c3, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening reaches a set value, and stopping;
and C4, executing the action 2 of the pneumatic control device, increasing the valve opening until the valve opening reaches a set value, and stopping.
In step S6, the method for the pneumatic control device to perform an operation includes the steps of:
s61, the controller outputs a command to the pneumatic control valve;
s62, opening the pneumatic control valve and actuating the power executing component;
and S63, actuating the valve until the valve opening reaches a preset value, and closing the pneumatic control valve.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A coal seam gas extraction regulation and control system in a coal mine well comprises a data acquisition module, a data display module, a data processing module and an action execution module, and is characterized in that the data acquisition module consists of an extraction parameter acquisition part fixed on an extraction pipeline and a valve state acquisition part connected with an extraction pipeline valve, the data processing module is respectively in communication connection with the data acquisition module and the action execution module, the data processing module processes data transmitted by the data acquisition module and displays the data through the data display module, the action execution module consists of a controller, a pneumatic control valve, a power execution part and a power transmission part, the power execution part and the power transmission part are both fixed on a valve body of the extraction pipeline valve, and a compressed air pipeline is connected with the power execution part through the pneumatic control valve, the power execution part converts the pressure energy of the compressed gas into mechanical energy and generates rotary motion, the rotary motion is transmitted to the extraction pipeline valve through the power transmission part to control the valve to act, and the controller controls the pneumatic control valve to act according to the information transmitted by the data processing module.
2. The system for regulating and controlling gas extraction of the coal mine underground coal seam according to claim 1, characterized in that: the extraction parameter acquisition component is a single sensor or a combination of a plurality of sensors capable of acquiring extraction negative pressure, gas flow, methane concentration, carbon monoxide concentration and environment temperature parameters.
3. The system for regulating and controlling gas extraction of the coal mine underground coal seam according to claim 1, characterized in that: the valve state acquisition part is a single sensor or a combination of a plurality of sensors capable of acquiring valve opening parameters.
4. The system for regulating and controlling gas extraction of the coal mine underground coal seam according to claim 1, characterized in that: the extraction parameter acquisition part is fixed on an underground extraction pipeline through a gas-entraining device or a gas-water separation device in a welding mode.
5. The system for regulating and controlling gas extraction of the coal mine underground coal seam according to claim 1, characterized in that: the input ends of the pneumatic control valves are connected with a compressed air pipeline in the coal mine, and the two output ends of the pneumatic control valves are respectively connected with an air inlet and an air outlet of the power execution component.
6. A regulation and control method of the coal mine underground coal seam gas extraction regulation and control system according to any one of claims 1 to 5 is characterized by comprising the following steps:
step 1, collecting extraction parameters and valve state parameters of an underground specified place through a data collection module;
step 2, carrying out fault diagnosis according to the data acquired by the data acquisition module, judging whether the extraction pipeline has faults or not, if the faults are found, carrying out fault alarm, if the faults are not found, entering step 3, and carrying out fault diagnosis, wherein the specific method comprises the following steps:
step 21, collecting extraction negative pressure and gas flow values of each measuring point of an extraction pipeline, numbering according to the distance from the measuring point to an extraction pump station from near to far, and recording the extraction negative pressure and gas flow values of the ith measuring point as PiAnd Qi；
Step 22, analyzing whether a fault exists between the ith measuring point and the (i + 1) th measuring point of the extraction pipeline by adopting a deviation index method, and judging the type of the fault;
step 23, entering a next measuring point, replacing i with i +1, returning to step 22 to judge the fault type of the next position until i is the number of the last measuring point;
step 3, selecting a regulation and control mode from two modes of automatic control and manual control of a ground computer;
step 4, the controller outputs a regulation and control command;
and 5, executing the action by an action execution module, wherein the specific execution mode is as follows:
step 51, the controller outputs a command to the pneumatic control valve;
step 52, opening the pneumatic control valve, and converting the pressure energy of the compressed gas into mechanical energy by the power execution unit and generating rotary motion to be transmitted to the extraction pipeline valve through the power transmission unit;
and 53, the extraction pipeline valve acts until the valve opening reaches a preset value, and the pneumatic control valve is closed.
7. A control method according to claim 6, wherein the ground automatic control method in the step 3 comprises the following steps:
b1, detecting the concentration of carbon monoxide of the gas in the extraction pipeline, if the concentration of the carbon monoxide is smaller than a set value, executing the step B2, otherwise, executing the step B4;
b2, detecting the methane concentration of the gas in the extraction pipeline, executing the step B5 if the methane concentration is smaller than a set value, otherwise executing the step B3;
b3, detecting the gas flow in the extraction pipeline, if the gas flow is smaller than a set value, executing the step B6, otherwise, stopping;
step B4, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening is 0, and stopping;
step B5, executing action 1 of the pneumatic control device, reducing the opening of the valve until the concentration of methane reaches a set value, and stopping;
and step B6, executing the action 2 of the pneumatic control device, increasing the opening of the valve until the gas flow reaches a set value, and stopping.
8. The regulation and control method according to claim 6, wherein the step 3 of manually controlling the regulation and control method comprises the following steps:
step C1, inputting a valve opening set value;
c2, judging the opening degree of the valve, if the opening degree of the valve is larger than a set value, executing the step C3, if the opening degree of the valve is smaller than the set value, executing the step C4, otherwise, stopping;
step C3, executing action 1 of the pneumatic control device, reducing the valve opening until the valve opening reaches a set value, and stopping;
and step C4, executing the action 2 of the pneumatic control device, increasing the valve opening until the valve opening reaches a set value, and stopping.
9. The method for controlling as claimed in claim 6, wherein the deviation index method in step 22 comprises the following processes:
step A1, calculating a negative pressure deviation index delta P and a gas flow deviation index delta Q by adopting the following formulas:
ΔP＝||Pi-Pi+1|-H|
ΔQ＝|Qi-Qi+1|
in the formula, H is the resistance of an extraction pipeline, Pa; k is a radical of1Is the local resistance coefficient; delta is the equivalent absolute roughness of the inner wall of the pipeline; d is the inner diameter of the circular pipeline, and for the non-circular pipeline, the equivalent diameter is cm; upsilon is the kinematic viscosity of the gas in the pipeline, m2/s；QiGas flow, m, monitored for the ith measurement point3/h；XiThe length m of the pipeline between the ith measuring point and the extraction pump is; xi+1The length m of the pipeline between the (i + 1) th measuring point and the extraction pump is; rho is the density of gas in the pipeline, kg/m3(ii) a g is the acceleration of gravity, m/s2；hi、hi+1Respectively the horizontal elevation m of the ith measuring point and the (i + 1) th measuring point;
step A2, analyzing the fault type, and setting the extraction negative pressure deviation threshold value as1The gas flow deviation threshold value is2If Δ P is not less than1And Δ Q is not less than2If the fault type is diagnosed as pipeline leakage; if Δ P is not less than1And Δ Q <2If the fault type is diagnosed as pipeline blockage; if the other condition is the case, the diagnosis is no fault.
10. A regulation and control method according to claim 6, characterized in that in step S1, the valve state parameter is valve opening, the value range is 0-90 °, and the collection of the valve opening parameter is realized by a valve state collection component.
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