CN103758561B - Extraction control for coal mine gas extraction control system - Google Patents
Extraction control for coal mine gas extraction control system Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 313
- 239000003245 coal Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims description 43
- 230000001174 ascending effect Effects 0.000 claims description 32
- 230000007423 decrease Effects 0.000 claims description 31
- 230000000630 rising effect Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 6
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000005065 mining Methods 0.000 abstract 7
- 238000001514 detection method Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 175
- 230000005540 biological transmission Effects 0.000 description 10
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
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Abstract
The invention relates to a coal mine gas extraction control system and extraction control method, and belongs to the field of coal mine gas extraction devices. The coal mine gas extraction control system comprises an extraction pump (2), an extraction main pipe (6), a plurality of mining area main pipe adjusting valves (8) and a plurality of mining area branch pipes (11), and is characterized in that a main pipe detection adjusting device connected with a controller (4) is installed on the extraction main pipe (6), mining area detection adjusting devices connected with the controller (4) at the same time are installed on the mining area main pipe adjusting valves (8), the controller (4) is connected with a frequency changer (3), and the frequency changer (3) is connected with the extraction pump (2). The coal mine gas extraction control method includes the extraction main pipe control process and the mining area main pipe control process. The valve opening and the rotation speed of the extraction pump in mining areas are adjusted through the controller and the frequency changer according to specific concentration of the mining areas, the energy use ratio is improved, the energy waste is avoided, and meanwhile the availability of extracted gas is guaranteed.
Description
Technical field
The extraction control method of coal mine gas drainage control system, belongs to coal mine gas drainage Apparatus and method for field.
Background technology
The negative pressure that namely gas pumping utilizes plant equipment and pipe special to cause, by the gas pumping in coal seam out, is transported to ground or other safety places.By gas pumping, can reduce the gas density of mine gas emission rate and excavation, reduce gas hidden danger and various gas accident, be the preventive measure ensureing safety in production.
Because China's coal geology is complicated, accumulate in the gas bearing capacity skewness in coal seam, when gas starts extraction, coal seam wall external pressure is greater than internal pressure, along with the double action of pressure, the vibrations of extraction pipeline in extraction process, the crack of coal seam wall is strengthened, and the air of wall outside, coal seam enters coal seam by the crack of coal seam wall, causes the concentration of the gas extracted out greatly to reduce.Now, because extraction is low due to concentration to the gas on ground, do not reach routine use standard, can only be discharged in air, add the content of atmospheric environment percent of greenhouse gases.When the gas density that extraction is arrived is lower, extraction pump still carries out extraction with former rotating speed, causes the waste of electric energy.Meanwhile, the gas in coal seam oozes out from crack along with the change of pressure, causes gas increasing concentrations within the scope of the wall outer partial of coal seam, has the danger of gas explosion.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, there is provided a kind of concrete concentration according to each exploiting field to adjust the valve opening in exploiting field and extraction pump rotating speed, ensure that the utilizability of gas extraction concentration has saved the extraction control method of the coal mine gas drainage control system of the energy simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: this coal mine gas drainage control system, comprise one or more extraction pump for carrying out gas pumping, extraction pump connects extraction main line, extraction main line extends to underground and is connected with the exploiting field main line in many exploiting fields simultaneously, every bar exploiting field main line is connected in parallel many exploiting field branch lines simultaneously, it is characterized in that: the main line be connected with controller is installed on described extraction main line and detects adjusting device, at each exploiting field main line, the exploiting field be simultaneously connected with controller is installed and detects adjusting device, controller is connected with frequency converter, frequency converter is connected with described extraction pump, described controller is PLC.
Preferred: described main line detects adjusting device and comprises the extraction main line control valve be connected in series on extraction main line and the one or more extraction main line sensors be arranged on for detecting extraction main line on extraction main line.
Described exploiting field is detected adjusting device and is comprised the exploiting field main line control valve be connected in series on the main line of exploiting field and the one or more exploiting field extraction main line sensors be arranged on for detecting exploiting field main line on the main line of exploiting field.
The electromagnetic valve that many described exploiting field branch lines are all connected in series with manual modulation valve or are connected with described controller.
Be provided with the wireless data transmission terminal DTU be connected with described controller.
Coal mine gas drainage control method, is characterized in that, comprises the extraction main line rate-determining steps controlled to adjust extraction main line by controller and the exploiting field main line rate-determining steps controlled to adjust exploiting field main line.
Described exploiting field main line rate-determining steps comprises:
Step 2001, starts;
Controller controls extraction pump and starts working, and carries out extraction to the gas in coal seam;
Step 2002, gas density is measured;
Exploiting field extraction main line sensor detects in real time to the gas density in the main line of exploiting field;
Step 2003, uploading of survey data;
The data upload that exploiting field extraction main line sensor collects is in controller;
Step 2004, the comparison of variation ofgas density amount;
This exploiting field main line, according to presetting sense cycle, is started and terminates the gas concentration that two time points collect and compare, confirm the variable quantity of gas density by controller in this sense cycle;
Step 2005, the calculating of variation ofgas density rate;
The variable quantity of the gas density in the sense cycle that controller is collected by exploiting field extraction main line sensor carries out the calculating of variation ofgas density rate by variation ofgas density rate design formulas;
Step 2006, controller judges whether gas density rises;
Controller judges whether this exploiting field gas density in this sense cycle rises, if risen, performs step 2007, otherwise performs step 2010;
Step 2007, controller judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate calculated, controller judges whether this exploiting field gas density in this sense cycle exceedes presetting ascending threshold, if exceed ascending threshold, perform step 2008, if do not exceed ascending threshold, performs step 2009;
Step 2008, increases valve opening;
The aperture that controller controls the exploiting field main line control valve in this exploiting field increases;
Step 2009, maintains valve opening;
The aperture of the exploiting field main line control valve that controller controls in this exploiting field remains unchanged;
Step 2010, controller judges whether gas density declines;
Controller judges whether gas density declines in this sense cycle, if declined, performs step 2011, otherwise performs step 2009;
Step 2011, controller judges whether gas density fall exceedes threshold value;
Controller judges in this sense cycle according to the variation ofgas density rate calculated, and whether the rate of change of gas density exceedes presetting falling-threshold value, if exceed falling-threshold value, performs step 2012, if do not exceed falling-threshold value, performs step 2009;
Step 2012, reduces valve opening;
The aperture that controller controls the exploiting field main line control valve in this exploiting field reduces.
Described extraction main line control flow, comprises the steps:
Step 3001, starts;
Controller controls extraction pump and starts working, and carries out extraction to the gas in coal seam;
Step 3002, the measurement of extraction main line intrinsic parameter;
Extraction main line sensor detects in real time to the gas density in extraction main line and overpressure;
Step 3003, uploading of survey data;
Every data that extraction main line sensor collects are uploaded in controller by data/address bus;
Step 3004, the judgement of extraction main line gas density;
Controller judges gas density in extraction main line according to the threshold value of presetting gas density and overpressure;
Step 3005, controller judges in extraction main line, whether gas is less than 3%;
Controller by extraction main line sensor Real-time Collection to gas density and overpressure judge now whether be less than 3% in extraction main line, if be less than 3%, perform step 3006, otherwise perform step 3007;
Step 3006, performs extraction main line extraction flow process;
Controller controls to perform extraction main line extraction flow process;
Step 3007, terminates extraction;
Controller controls extraction pump, extraction main line control valve cuts out, and terminates extraction.
Described extraction main line extraction flow process, comprises the steps:
Step 4001, starts;
Controller controls extraction pump and starts working, and carries out extraction to the gas in coal seam;
Step 4002, extraction main line gas density is measured;
Extraction main line sensor detects in real time to the gas density in extraction main line;
Step 4003, uploading of survey data;
Every data that extraction main line sensor collects are uploaded in controller by data/address bus;
Step 4004, the calculating of gas variable quantity and rate of change;
Extraction main line, according to presetting sense cycle, is started and terminates the gas concentration that two time points collect and compare, confirm the variable quantity of gas density, and calculate according to variation ofgas density rate design formulas by controller in this sense cycle;
Step 4005, whether gas density rises;
According to variation ofgas density amount, controller judges in extraction main line, whether gas density is propradation, if be propradation, perform step 4006, otherwise perform step 4019;
Step 4006, controller judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate in this sense cycle calculated, controller judges whether the rate of change of extraction main line gas density in this sense cycle exceedes presetting ascending threshold, if do not exceed ascending threshold, perform step 4007, if exceed ascending threshold, perform step 4008;
Step 4007, maintains valve opening;
The aperture that controller maintains extraction main line control valve is constant;
Step 4008, increases valve opening
The aperture that controller controls extraction main line control valve becomes large;
Step 4009, the judgement of gas variable quantity and rate of change;
Controller, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4010, whether gas density continues is risen;
According to variation ofgas density amount, controller judges that in extraction main line, whether gas density continues to rise, if continue to rise, performs step 4011, otherwise performs step 4019;
Step 4011, controller judges whether gas density ascensional range exceedes threshold value;
Controller judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4012, if exceed ascending threshold, performs step 4013;
Step 4012, maintains extraction pump rotating speed;
Controller controls extraction pump and maintains the operation of existing rotating speed;
Step 4013, increases extraction pump rotating speed;
The rotating speed that controller controls extraction pump increases;
Step 4014, the judgement of gas variable quantity and rate of change;
Controller, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4015, whether gas density continues is risen;
According to variation ofgas density amount, controller judges that in extraction main line, whether gas density continues to rise, if continue to rise, performs step 4016, otherwise performs step 4019;
Step 4016, controller judges whether gas density ascensional range exceedes threshold value;
Controller judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4017, if exceed ascending threshold, performs step 4018;
Step 4017, maintains the power ratio of extraction pump;
Controller controls extraction pump and maintains standing state operation;
Step 4018, increases the power ratio of extraction pump;
Controller, by controlling the start and stop of extraction pump, reduces extraction power;
Step 4019, whether gas density declines;
According to variation ofgas density amount, controller judges in extraction main line, whether gas density is decline state, if be decline state, perform step 4020, otherwise perform step 4021;
Step 4020, controller judges whether gas density fall exceedes threshold value;
According to variation ofgas density rate, controller judges whether extraction main line rate of change exceedes presetting falling-threshold value, if do not exceed falling-threshold value, perform step 4021, if exceed falling-threshold value, performs step 4022;
Step 4021, maintains standing state;
The existing running status that controller maintains extraction main line control valve and extraction pump is constant;
Step 4022, reduces the power ratio of extraction pump;
Controller, by controlling the start and stop of extraction pump, reduces extraction power;
Step 4023, the judgement of gas variable quantity and rate of change;
Controller, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4024, gas density whether continuous decrease;
Controller to judge in extraction main line gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4025, otherwise returns step 4005;
Step 4025, controller judges whether gas density fall exceedes threshold value;
Controller judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4027, if exceed falling-threshold value, performs step 4026;
Step 4026, reduces extraction pump rotating speed;
Controller controls extraction pump rotating speed to be reduced;
Step 4027, maintains extraction pump rotating speed;
The rotating speed that controller maintains extraction pump is constant;
Step 4028, the judgement of gas variable quantity and rate of change;
Controller, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in this sense cycle, and judges;
Step 4029, gas density whether continuous decrease;
Controller to judge in extraction main line gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4030, otherwise returns step 4005;
Step 4030, controller judges whether gas density fall exceedes threshold value;
Controller judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4032, if exceed falling-threshold value, performs step 4031;
Step 4031, reduces valve opening;
The aperture that controller controls extraction main line control valve diminishes;
Step 4032, maintains valve opening;
The aperture that controller maintains extraction main line control valve is constant.
Step 2005 and the variation ofgas density rate design formulas described in step 4004 are:
Wherein:
gas density at the end of being a sense cycle,
for gas density when this sense cycle starts.
Compared with prior art, the beneficial effect that the present invention has is:
According to the concrete concentration in each exploiting field, the valve opening in exploiting field and extraction pump rotating speed are adjusted by controller and frequency converter by the extraction control method of coal mine gas drainage control system of the present invention, improve the utilization rate of the energy, avoid the waste of the energy, ensure that the utilizability of the gas that extraction goes out simultaneously.Use PLC to control as controller, intelligence degree is higher, and staff can carry out sets itself according to the actual conditions in different colliery to each data simultaneously, and scalability is better, and the scope of application is wider simultaneously.
Be provided with the wireless data transmission terminal DTU be connected with controller, staff can send control signal to controller by wireless data transmission terminal DTU, realize Long-distance Control, and the inquiry of respective line parameter, by arranging wireless data transmission terminal DTU, facilitate aboveground and underground work personnel to understand down-hole monitored data everywhere, can Long-distance Control be realized simultaneously, save manpower and materials.
Accompanying drawing explanation
Fig. 1 is the extraction control method system architecture schematic diagram of coal mine gas drainage control system.
Fig. 2 is the extraction control method exploiting field main line control flow chart of coal mine gas drainage control system.
Fig. 3 is the extraction control method extraction main line control flow chart of coal mine gas drainage control system.
Fig. 4 is the extraction control method extraction main line extraction flow chart of coal mine gas drainage control system.
Wherein: 1, extraction main line sensor 2, extraction pump 3, frequency converter 4, controller 5, data/address bus 6, extraction main line 7, extraction main line control valve 8, exploiting field main line control valve 9, exploiting field main line 10, exploiting field extraction main line sensor 11, exploiting field branch line 12, manual modulation valve 13, wireless data transmission terminal DTU.
Detailed description of the invention
Fig. 1 ~ 4 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 4, the present invention will be further described.
As shown in Figure 1, coal mine gas drainage control system of the present invention comprises the controller 4, frequency converter 3, wireless data transmission terminal DTU13 and the multiple extraction pump 2 that are positioned at ground.Wireless data transmission terminal DTU13 is connected with controller 4, staff can send control signal to controller by wireless data transmission terminal DTU13, realize Long-distance Control, comprise the control realizing extraction pump 2 by controller 4, send control command by wireless data transmission terminal DTU13 to controller 4 simultaneously, the parameter of inquiry respective line, by arranging wireless data transmission terminal DTU13, aboveground and underground work personnel are facilitated to understand down-hole monitored data everywhere, can Long-distance Control be realized simultaneously, save manpower and materials.Controller 4 is connected with frequency converter 3, and for controlling frequency converter 3, frequency converter 3 is connected with extraction pump 2, for regulating the rotating speed of extraction pump 2.In actual applications, can according to the quantity of extraction pump 2 and one or more frequency converter 3 of power setting, every platform frequency converter 3 correspondence controls one or more extraction pump 2.All extraction pump 2 are connected with extraction main line 6 on the ground simultaneously, and extraction main line 6 is connected in parallel exploiting field main line 9 corresponding in each exploiting field simultaneously after extending to underground.In each exploiting field, exploiting field main line 9 is connected in parallel the exploiting field branch line 11 that many are positioned at this exploiting field simultaneously, and every bar exploiting field branch line 11 stretches in coal seam and directly extracts the gas in coal seam.
In above-mentioned extraction main line 6, be provided with extraction main line sensor 1, extraction main line sensor 1 can mount different sensor probes and detect the composition of the multiple parameters in extraction main line 6 as the pipe's flow parameter such as pressure, flow, temperature and gas as interior in pipes such as gas, carbon monoxide, hydrogen sulfide.Extraction main line sensor 1 is connected with the input port of controller 4 by data/address bus 5, the real time data detected is uploaded in controller 4, relevant control or display is carried out by controller 4, extraction main line sensor 1 can as required on the ground or underground one or more is set, be connected in series with extraction main line control valve 7 in extraction main line 6 simultaneously, output port and the extraction main line control valve 7 of controller 4 control, and realize the closure state of extraction main line 6 by extraction main line control valve 7.
Exploiting field extraction main line sensor 10 is connected in series with, for detecting the composition of the multiple parameters in exploiting field main line 9 as the pipe's flow parameter such as pressure, flow, temperature and gas as interior in pipes such as gas, carbon monoxide, hydrogen sulfide in above-mentioned exploiting field main line 9.Each exploiting field extraction main line sensor 10 is connected by the input port of data/address bus 5 with controller 4, the real time data detected is uploaded in controller 4, and exploiting field extraction main line sensor 10 can arrange one or more simultaneously as required.In exploiting field main line 9, be connected in series with exploiting field main line control valve 8, controller 4 is connected with all exploiting field main line control valves 8 and controls its aperture simultaneously simultaneously.Manual modulation valve 12 is connected in series with respectively in the every bar exploiting field branch line 11 be connected with exploiting field main line 9.In the present invention, controller adopts PLC to realize.
When actual extraction, the gas in coal seam is imported in extraction main line 6 by exploiting field branch line 11, exploiting field main line 9 successively simultaneously, is evacuated to processes on the ground by extraction main line 6.Controller 4 is controlled by the exploiting field pipeline of main line control flow to each point of exploiting field, control by the duty of extraction main line control flow to extraction main line 6 and each extraction pump 2 simultaneously, make whole control procedure more intelligent, the power ratio of each extraction pump 2 is more balanced, avoids the waste of resource.
Point exploiting field control flow chart as shown in Figure 2, comprises the steps:
Step 2001, starts;
Controller 4 controls extraction pump 2 and starts working, and carries out extraction to the gas in coal seam;
Step 2002, gas density is measured;
Gas density in exploiting field extraction main line sensor 10 pairs of exploiting field main lines 9 detects in real time;
Step 2003, uploading of survey data;
The data upload that exploiting field extraction main line sensor 10 collects is in controller 4;
Step 2004, the comparison of variation ofgas density amount;
This exploiting field main line 9, according to presetting sense cycle, is started and terminates the gas concentration that two time points collect and compare, confirm the variable quantity of gas density by controller 4 in this sense cycle;
If this variable quantity be on the occasion of, then representing that this exploiting field gas density in this sense cycle is in rising trend, if be negative value, is downward trend, if this variable quantity is approximately equal to zero, then represent that larger change does not appear in this exploiting field gas density in this sense cycle, keep stable.Sense cycle can set according to actual needs;
Step 2005, the calculating of variation ofgas density rate;
The variable quantity of the gas density in the sense cycle that controller 4 is collected by exploiting field extraction main line sensor 10 carries out the calculating of variation ofgas density rate;
In the present invention, gas rate of change C is defined as the ratio of gas density when the variable quantity of the gas density in a sense cycle and this sense cycle start, and calculates by formula (1):
（1）
Wherein:
gas density at the end of being a sense cycle,
for gas density when this sense cycle starts.
Step 2006, controller 4 judges whether gas density rises;
Controller 4 judges whether this exploiting field gas density in this sense cycle rises, if risen, performs step 2007, otherwise performs step 2010;
Step 2007, controller 4 judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate calculated, controller 4 judges whether this exploiting field gas density in this sense cycle exceedes presetting ascending threshold, if exceed ascending threshold, perform step 2008, if do not exceed ascending threshold, performs step 2009;
Step 2008, increases valve opening;
The aperture that controller 4 controls the exploiting field main line control valve 8 in this exploiting field increases;
Step 2009, maintains valve opening;
The aperture of the exploiting field main line control valve 8 that controller 4 controls in this exploiting field remains unchanged;
Step 2010, controller 4 judges whether gas density declines;
Controller 4 judges whether gas density declines in this sense cycle, if declined, performs step 2011, otherwise performs step 2009;
Step 2011, controller 4 judges whether gas density fall exceedes threshold value;
Controller 4 judges in this sense cycle according to the variation ofgas density rate calculated, and whether the rate of change of gas density exceedes presetting falling-threshold value, if exceed falling-threshold value, performs step 2012, if do not exceed falling-threshold value, performs step 2009;
Step 2012, reduces valve opening;
The aperture that controller 4 controls the exploiting field main line control valve 8 in this exploiting field reduces.
The gas detected in this exploiting field when the exploiting field extraction main line sensor 10 in certain exploiting field closes the multiple manual modulation valves 12 in this exploiting field after finding time by the communication system notice underground work personnel in colliery.Manual modulation valve 12 is also replaced by electromagnetic valve, carries out same control by controller 4.
Be illustrated in figure 3 the control flow chart of the gas frequency conversion extraction control method extraction main line 6 in colliery of the present invention, comprise the steps:
Step 3001, starts;
Controller 4 controls extraction pump 2 and starts working, and carries out extraction to the gas in coal seam;
Step 3002, the measurement of extraction main line 6 intrinsic parameter;
Gas density in extraction main line sensor 1 pair of extraction main line 6 and overpressure detect in real time;
Step 3003, uploading of survey data;
Every data that extraction main line sensor 1 collects are uploaded in controller 4 by data/address bus 5;
Step 3004, the judgement of extraction main line 6 gas density;
Controller 4 judges gas density in extraction main line 6 according to the threshold value of presetting gas density and overpressure;
Step 3005, controller 4 judges in extraction main line 6, whether gas is less than 3%;
Controller 4 by extraction main line sensor 1 Real-time Collection to gas density and overpressure judge now whether be less than 3% in extraction main line 6, if be less than 3%, perform step 3006, otherwise perform step 3007;
Step 3006, performs extraction main line extraction flow process;
Controller 4 controls to perform extraction main line extraction flow process;
Step 3007, terminates extraction;
Controller 4 controls extraction pump 2, extraction main line control valve 7 cuts out, and terminates extraction.
After execution of step 3006 or 3007, again return and perform step 3002, carry out the monitoring of next sense cycle.
As shown in Figure 4, above-mentioned extraction main line 6 extraction flow process, comprises the steps:
Step 4001, starts;
Controller 4 controls extraction pump 2 and starts working, and carries out extraction to the gas in coal seam;
Step 4002, extraction main line 6 gas density is measured;
Gas density in extraction main line sensor 1 pair of extraction main line 6 detects in real time;
Step 4003, uploading of survey data;
Every data that extraction main line sensor 1 collects are uploaded in controller 4 by data/address bus 5;
Step 4004, the calculating of gas variable quantity and rate of change;
Extraction main line, according to presetting sense cycle, is started and terminates the gas concentration that two time points collect and compare, confirm the variable quantity of gas density, and carry out the calculating of variation ofgas density rate by controller 4 in this sense cycle;
If gas variable quantity be on the occasion of, then represent that in extraction main line 6 this sense cycle inherent, gas density is in rising trend, if be negative value, it is downward trend, if this variable quantity is approximately equal to zero, then represent that in extraction main line 6 this sense cycle inherent, larger change does not appear in gas density, keeps stable.Sense cycle can set according to actual needs, and gas rate of change calculates by above-mentioned formula (1).
Step 4005, whether gas density rises;
According to variation ofgas density amount, controller 4 judges in extraction main line 6, whether gas density is propradation, if be propradation, perform step 4006, otherwise perform step 4019;
Step 4006, controller 4 judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate in this sense cycle calculated, controller 4 judges whether the rate of change of extraction main line 6 gas density in this sense cycle exceedes presetting ascending threshold, if do not exceed ascending threshold, perform step 4007, if exceed ascending threshold, perform step 4008;
Step 4007, maintains valve opening;
The aperture that controller 4 maintains extraction main line control valve 7 is constant;
Step 4008, increases valve opening
The aperture that controller 4 controls extraction main line control valve 7 becomes large;
Step 4009, the judgement of gas variable quantity and rate of change;
Controller 4, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4010, whether gas density continues is risen;
According to variation ofgas density amount, controller 4 judges that in extraction main line 6, whether gas density continues to rise, if continue to rise, performs step 4011, otherwise performs step 4019;
Step 4011, controller 4 judges whether gas density ascensional range exceedes threshold value;
Controller 4 judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4012, if exceed ascending threshold, performs step 4013;
Step 4012, maintains extraction pump 2 rotating speed;
Controller 4 controls extraction pump 2 and maintains the operation of existing rotating speed;
Step 4013, increases extraction pump 2 rotating speed;
The rotating speed that controller 4 controls extraction pump 2 increases;
Step 4014, the judgement of gas variable quantity and rate of change;
Controller 4, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4015, whether gas density continues is risen;
According to variation ofgas density amount, controller 4 judges that in extraction main line 6, whether gas density continues to rise, if continue to rise, performs step 4016, otherwise performs step 4019;
Step 4016, controller 4 judges whether gas density ascensional range exceedes threshold value;
Controller 4 judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4017, if exceed ascending threshold, performs step 4018;
Step 4017, maintains the power ratio of extraction pump 2;
Controller 4 controls extraction pump 2 and maintains standing state operation;
Step 4018, increases the power ratio of extraction pump 2;
Controller 4, by controlling the start and stop of extraction pump 2, reduces extraction power;
In actual field, extraction pump 2 is provided with the multiple stage of different capacity, actual carry out extraction time, only open wherein one or more carry out with the use of, stand by pump is equipped with simultaneously.Controller 4 is when improving the power ratio of extraction pump 2, whether first detect existing extraction pump proportioning has been peak power proportioning, if be peak power proportioning, then maintain the statusquo, if not maximum power ratio, then first minimum for power in the extraction pump 2 of work on hand one is cut off, change the extraction pump 2 that power is larger, if the extraction pump 2 of the quantity of having opened has been peak power proportioning, then the unlatching quantity by increasing extraction pump 2 has improved extraction power.
Step 4019, whether gas density declines;
According to variation ofgas density amount, controller 4 judges in extraction main line 6, whether gas density is decline state, if be decline state, perform step 4020, otherwise perform step 4021;
Step 4020, controller 4 judges whether gas density fall exceedes threshold value;
According to variation ofgas density rate, controller 4 judges whether extraction main line 6 rate of change exceedes presetting falling-threshold value, if do not exceed falling-threshold value, perform step 4021, if exceed falling-threshold value, performs step 4022;
Step 4021, maintains standing state;
The existing running status that controller 4 maintains extraction main line control valve 7 and extraction pump 2 is constant;
Step 4022, reduces the power ratio of extraction pump 2;
Controller 4, by controlling the start and stop of extraction pump 2, reduces extraction power;
Controller 4 is when reducing the power ratio of extraction pump 2, whether first detect existing extraction pump proportioning has been minimum power proportioning, if be peak power proportioning, then maintain the statusquo, if not maximum power ratio, then first by the extraction pump 2 of work on hand prominent one cut off, change lower-powered extraction pump 2, if the extraction pump 2 of the quantity of having opened has been minimum power proportioning, then the unlatching quantity by closing extraction pump 2 has reduced extraction power.
Step 4023, the judgement of gas variable quantity and rate of change;
Controller 4, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4024, gas density whether continuous decrease;
Controller 4 to judge in extraction main line 6 gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4025, otherwise returns step 4005;
Step 4025, controller 4 judges whether gas density fall exceedes threshold value;
Controller 4 judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4027, if exceed falling-threshold value, performs step 4026;
Step 4026, reduces extraction pump 2 rotating speed;
Controller 4 controls extraction pump 2 rotating speed to be reduced;
Step 4027, maintains extraction pump 2 rotating speed;
The rotating speed that controller 4 maintains extraction pump 2 is constant;
Step 4028, the judgement of gas variable quantity and rate of change;
Controller 4, according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in this sense cycle, and judges;
Step 4029, gas density whether continuous decrease;
Controller 4 to judge in extraction main line 6 gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4030, otherwise returns step 4005;
Step 4030, controller 4 judges whether gas density fall exceedes threshold value;
Controller 4 judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4032, if exceed falling-threshold value, performs step 4031;
Step 4031, reduces valve opening;
The aperture that controller 4 controls extraction main line control valve 7 diminishes;
Step 4032, maintains valve opening;
The aperture that controller 4 maintains extraction main line control valve 7 is constant.
The ascending threshold of above-mentioned variation ofgas density rate and falling-threshold value can as required from settings, and in the present invention, this ascending threshold is set as 60%, and falling-threshold value is set as 30%.
In actual applications under normal circumstances, after the exploiting field main line control valve 8 in certain point of exploiting field is controlled the reduction of its aperture because gas density reduces by controller 4, overpressure decreases, gas density can rise gradually, after the variable quantity of gas density rising exceedes threshold value, controller 4 can control this exploiting field main line control valve 8 aperture and increase, and now overpressure rises, gas density reduces, and so circulates.When gas density in managing is reduced to down in limited time, pressure, density and pressure are in lower numerical value simultaneously (this force value and concentration value can be arranged voluntarily according to colliery actual conditions), the now likely one of appearance below in several situation: duct sealing does not sternly cause gas leakage; Pipeline leaks gas; Gas is found time.Now carry out alarm by controller 4, prompting staff investigates above-mentioned situation, removes a hidden danger to the full extent, avoids the generation of accident.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (3)
1. the extraction control method of coal mine gas drainage control system, comprise one or more extraction pump (2) for carrying out gas pumping, extraction pump (2) connects extraction main line (6), extraction main line (6) extends to underground and is connected with the exploiting field main line (9) in many exploiting fields simultaneously, every bar exploiting field main line (9) is connected in parallel many exploiting field branch lines (11) simultaneously, described extraction main line (6) is provided with the main line be connected with controller (4) and detects adjusting device, the exploiting field be simultaneously connected with controller (4) is installed in each exploiting field main line (9) and detects adjusting device, controller (4) is connected with frequency converter (3), frequency converter (3) is connected with described extraction pump (2), described controller (4) is PLC,
Described main line detects adjusting device and comprises the extraction main line control valve (7) be connected in series on extraction main line (6) and the one or more extraction main line sensors (1) be arranged on for detecting extraction main line (6) on extraction main line (6);
Described exploiting field is detected adjusting device and is comprised exploiting field main line control valve (8) be connected in series on exploiting field main line (9) and one or more exploiting field extraction main lines sensor (10) be arranged on for detecting exploiting field main line (9) on exploiting field main line (9);
It is characterized in that: comprise the extraction main line rate-determining steps controlled to adjust extraction main line (6) by controller (4) and the exploiting field main line rate-determining steps controlled to adjust exploiting field main line (9), described exploiting field main line rate-determining steps comprises:
Step 2001, starts;
Controller (4) controls extraction pump (2) and starts working, and carries out extraction to the gas in coal seam;
Step 2002, gas density is measured;
Exploiting field extraction main line sensor (10) detects in real time to the gas density in exploiting field main line (9);
Step 2003, uploading of survey data;
The data upload that exploiting field extraction main line sensor (10) collects is in controller (4);
Step 2004, the comparison of variation ofgas density amount;
This exploiting field main line (9), according to presetting sense cycle, is started and terminates the gas concentration that two time points collect and compare, confirm the variable quantity of gas density by controller (4) in this sense cycle;
Step 2005, the calculating of variation ofgas density rate;
The variable quantity of the gas density in the sense cycle that controller (4) is collected by exploiting field extraction main line sensor (10) carries out the calculating of variation ofgas density rate by variation ofgas density rate design formulas;
Step 2006, controller (4) judges whether gas density rises;
Controller (4) judges whether this exploiting field gas density in this sense cycle rises, if risen, performs step 2007, otherwise performs step 2010;
Step 2007, controller (4) judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate calculated, controller (4) judges whether this exploiting field gas density in this sense cycle exceedes presetting ascending threshold, if exceed ascending threshold, perform step 2008, if do not exceed ascending threshold, performs step 2009;
Step 2008, increases valve opening;
The aperture that controller (4) controls exploiting field main line control valve (8) in this exploiting field increases;
Step 2009, maintains valve opening;
The aperture in exploiting field main line control valve (8) that controller (4) controls in this exploiting field remains unchanged;
Step 2010, controller (4) judges whether gas density declines;
Controller (4) judges whether gas density declines in this sense cycle, if declined, performs step 2011, otherwise performs step 2009;
Step 2011, controller (4) judges whether gas density fall exceedes threshold value;
Controller (4) judges in this sense cycle according to the variation ofgas density rate calculated, whether the rate of change of gas density exceedes presetting falling-threshold value, if exceed falling-threshold value, performs step 2012, if do not exceed falling-threshold value, perform step 2009;
Step 2012, reduces valve opening;
The aperture that controller (4) controls exploiting field main line control valve (8) in this exploiting field reduces;
Described extraction main line control flow, comprises the steps:
Step 3001, starts;
Controller (4) controls extraction pump (2) and starts working, and carries out extraction to the gas in coal seam;
Step 3002, the measurement of extraction main line (6) intrinsic parameter;
Extraction main line sensor (1) detects in real time to the gas density in extraction main line (6) and overpressure;
Step 3003, uploading of survey data;
Every data that extraction main line sensor (1) collects are uploaded in controller (4) by data/address bus (5);
Step 3004, the judgement of extraction main line (6) gas density;
Controller (4) judges extraction main line (6) interior gas density according to the threshold value of presetting gas density and overpressure;
Step 3005, controller (4) judges whether extraction main line (6) interior gas is less than 3%;
Controller (4) by extraction main line sensor (1) Real-time Collection to gas density and overpressure judge now whether be less than 3% in extraction main line (6), if be less than 3%, perform step 3006, otherwise perform step 3007;
Step 3006, performs extraction main line extraction flow process;
Controller (4) controls to perform extraction main line extraction flow process;
Step 3007, terminates extraction;
Controller (4) controls extraction pump (2), extraction main line control valve (7) cuts out, and terminates extraction.
2. the extraction control method of coal mine gas drainage control system according to claim 1, is characterized in that: described extraction main line extraction flow process, comprises the steps:
Step 4001, starts;
Controller (4) controls extraction pump (2) and starts working, and carries out extraction to the gas in coal seam;
Step 4002, extraction main line (6) gas density is measured;
Extraction main line sensor (1) detects in real time to the gas density in extraction main line (6);
Step 4003, uploading of survey data;
Every data that extraction main line sensor (1) collects are uploaded in controller (4) by data/address bus (5);
Step 4004, the calculating of gas variable quantity and rate of change;
Controller (4) is according to presetting sense cycle, extraction main line is started and is terminated in this sense cycle the gas concentration that two time points collect to compare, confirm the variable quantity of gas density, and calculate according to variation ofgas density rate design formulas;
Step 4005, whether gas density rises;
According to variation ofgas density amount, controller (4) judges whether extraction main line (6) interior gas density is propradation, if be propradation, perform step 4006, otherwise perform step 4019;
Step 4006, controller (4) judges whether gas density ascensional range exceedes threshold value;
According to the variation ofgas density rate in this sense cycle calculated, controller (4) judges whether extraction main line (6) rate of change of gas density in this sense cycle exceedes presetting ascending threshold, if do not exceed ascending threshold, perform step 4007, if exceed ascending threshold, perform step 4008;
Step 4007, maintains valve opening;
The aperture that controller (4) maintains extraction main line control valve (7) is constant;
Step 4008, increases valve opening
The aperture that controller (4) controls extraction main line control valve (7) becomes large;
Step 4009, the judgement of gas variable quantity and rate of change;
Controller (4), according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4010, whether gas density continues is risen;
According to variation ofgas density amount, controller (4) judges whether extraction main line (6) interior gas density continues to rise, if continue to rise, performs step 4011, otherwise performs step 4019;
Step 4011, controller (4) judges whether gas density ascensional range exceedes threshold value;
Controller (4) judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4012, if exceed ascending threshold, performs step 4013;
Step 4012, maintains extraction pump (2) rotating speed;
Controller (4) controls extraction pump (2) and maintains the operation of existing rotating speed;
Step 4013, increases extraction pump (2) rotating speed;
The rotating speed that controller (4) controls extraction pump (2) increases;
Step 4014, the judgement of gas variable quantity and rate of change;
Controller (4), according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4015, whether gas density continues is risen;
According to variation ofgas density amount, controller (4) judges whether extraction main line (6) interior gas density continues to rise, if continue to rise, performs step 4016, otherwise performs step 4019;
Step 4016, controller (4) judges whether gas density ascensional range exceedes threshold value;
Controller (4) judges that gas density continues rising and whether exceedes threshold value, if do not exceed ascending threshold, performs step 4017, if exceed ascending threshold, performs step 4018;
Step 4017, maintains the power ratio of extraction pump (2);
Controller (4) controls extraction pump (2) and maintains standing state operation;
Step 4018, increases the power ratio of extraction pump (2);
Controller (4), by controlling the start and stop of extraction pump (2), reduces extraction power;
Step 4019, whether gas density declines;
According to variation ofgas density amount, controller (4) judges whether extraction main line (6) interior gas density is decline state, if be decline state, perform step 4020, otherwise perform step 4021;
Step 4020, controller (4) judges whether gas density fall exceedes threshold value;
According to variation ofgas density rate, controller (4) judges whether extraction main line (6) rate of change exceedes presetting falling-threshold value, if do not exceed falling-threshold value, perform step 4021, if exceed falling-threshold value, performs step 4022;
Step 4021, maintains standing state;
The existing running status that controller (4) maintains extraction main line control valve (7) and extraction pump (2) is constant;
Step 4022, reduces the power ratio of extraction pump (2);
Controller (4), by controlling the start and stop of extraction pump (2), reduces extraction power;
Step 4023, the judgement of gas variable quantity and rate of change;
Controller (4), according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in new sense cycle, and judges;
Step 4024, gas density whether continuous decrease;
Controller (4) judges extraction main line (6) interior gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4025, otherwise returns step 4005;
Step 4025, controller (4) judges whether gas density fall exceedes threshold value;
Controller (4) judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4027, if exceed falling-threshold value, performs step 4026;
Step 4026, reduces extraction pump (2) rotating speed;
Controller (4) controls extraction pump (2) rotating speed to be reduced;
Step 4027, maintains extraction pump (2) rotating speed;
The rotating speed that controller (4) maintains extraction pump (2) is constant;
Step 4028, the judgement of gas variable quantity and rate of change;
Controller (4), according to presetting sense cycle, calculates variable quantity and the rate of change of gas density in this sense cycle, and judges;
Step 4029, gas density whether continuous decrease;
Controller (4) judges extraction main line (6) interior gas density whether continuous decrease according to variation ofgas density amount, if continuous decrease, performs step 4030, otherwise returns step 4005;
Step 4030, controller (4) judges whether gas density fall exceedes threshold value;
Controller (4) judges whether gas density continuous decrease exceedes threshold value, if do not exceed falling-threshold value, performs step 4032, if exceed falling-threshold value, performs step 4031;
Step 4031, reduces valve opening;
The aperture that controller (4) controls extraction main line control valve (7) diminishes;
Step 4032, maintains valve opening;
The aperture that controller (4) maintains extraction main line control valve (7) is constant.
3. the extraction control method of coal mine gas drainage control system according to claim 2, is characterized in that: the variation ofgas density rate design formulas described in step 4004 is:
Wherein:
gas density at the end of being a sense cycle,
for gas density when this sense cycle starts.
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Denomination of invention: Extraction control method of coal mine gas extraction control system Effective date of registration: 20210811 Granted publication date: 20150422 Pledgee: Hengfeng Bank Co.,Ltd. Zibo Branch Pledgor: Shandong Anyi mining equipment Co.,Ltd. Registration number: Y2021980007546 |