CN102562156A - Automatic concentration adjusting and controlling early warning method for underground gas extraction pipelines and system of automatic concentration adjusting and controlling early warning method - Google Patents
Automatic concentration adjusting and controlling early warning method for underground gas extraction pipelines and system of automatic concentration adjusting and controlling early warning method Download PDFInfo
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Abstract
An automatic concentration adjusting and controlling early warning method for underground gas extraction pipelines includes (1) integrally assembling a signal acquisition unit with an actuating unit and mounting the signal acquisition unit and the actuating unit onto a gas extraction pipeline; (2) operating the actuating unit and determining the longest negative pressure lag time between pipeline gas concentration and extraction negative pressure and the highest pipeline gas concentration; (3) setting early warning gas concentration and early warning negative pressure lag time according to the obtained longest negative pressure lag time and the obtained highest pipeline gas concentration; (4) acquiring a current gas concentration value and a current negative pressure value in real time; promoting that the highest pipeline gas concentration is mistaken if the current gas concentration value is higher than the highest pipeline gas concentration, and actuating the step (2) again; keeping opening of an electric valve unchanged if the current gas concentration value is smaller than the highest pipeline gas concentration but larger than a set early warning gas concentration value; and alarming if the current gas concentration value is smaller than the set early warning gas concentration value, simultaneously searching the best extraction negative pressure, and then continuing extracting gas under the condition of the best extraction negative pressure; and (5) periodically repeating the step (2), the step (3) and the step (4) after a system runs normally.
Description
Technical field
The present invention relates to coal mine gas extraction technical field, relate in particular to the regulation and control and the hidden danger method for early warning of gas density in the underground gas extraction pipeline.
Background technology
Over past ten years, coal in China output is increased to 3,000,000,000 tons by 1,000,000,000 tons, and mining depth strengthens year by year, and highly gassy mine and coal and gas outburst mine are more and more.National regulation, highly gassy mine and coal and gas outburst mine must be implemented gas pumping, and not up to standard permission of extraction exploited.Underground gas extraction is one of main means of control of coalmine gas, is the important safety assurance of high prominent mine high-yield and high-efficiency, also is the basis and the prerequisite of gas utilization, also is the needs of Safety of Coal Mine Production and energy-saving and emission-reduction simultaneously.
The coal mine down-hole drilling gas pumping normally to a large amount of boring of coal seam construction, carries out sealing of hole then and joins the hole, finally imports the extraction pipeline in the tunnel.The most coal seams of China belong to lower permeability seam, the gas pumping difficulty, and extraction borehole exists comparatively seriously, and sealing of hole leaks gas, join the hole gas leak phenomenon, and still unresolved at present.After the boring gas leakage; Can cause the gas pumping total concentration to reduce; If the gas density in the extraction pipeline is within the blast limit (methane content 5%-16%), bring threat will for extraction pipeline safety, domesticly occurred that gas explosion causes the blast of extraction pipeline and the case that makes the accident extension.
If gas pumping concentration is low excessively, do not reach concentration capable of using, low concentration gas will be compelled to enter atmosphere, not only increase the discharging of greenhouse gases, also be a kind of waste of energy resources simultaneously.External early stage mining area, Rule for gas utilization and pipeline safety, is regularly closed down the extraction pipeline and is started, in the hope of obtaining safe gas density capable of using.Domestic some mining area is in order to improve pipeline extraction concentration; Basically be by closing the hole; Find which hole pumping and mining concentration is low and just close that a boring gas leakage will be handled through the extraction system that closes the whole piece tunnel sometimes, causes great waste without analyzing; Do not have the extinction effect, stay potential safety hazard yet for mining later on.
Though above-mentioned way can improve gas pumping concentration to a certain extent; But gas is fully discharged owing to close the hole; Not only reduced the level of resources utilization but also stayed potential safety hazard to the colliery exploitation; This part gas of while directly enters atmosphere and also can increase the weight of greenhouse effect, pollutant atmosphere.
In a word, because there is the gas leakage problem in drilling and sealing, the difference of the variation of the difference of drilling depth, gas permeability of coal seam and sealing quality in addition makes the gas pumping concentration of this coal bed drilling have following problem:
1, the self-condition from the coal seam not, binding sites such as gas permeability, gas bearing capacity, gas pressure go the whole gas density control of considering;
2, to have height to have low for the extraction concentration of the different borings of the same area, and the faster or slower of the gas density rate of decay, difference is bigger;
3, extraction negative pressure wants much does not have concrete concentration control theory and method for using to coach entirely by rule of thumb, too unilateral and careless.
Summary of the invention
The key technical problem that the present invention will solve is the manual adjustment and the present situation of blindly regulating and control that changes gas density in the existing gas pumping pipeline, solves the matching problem of gas pumping pipeline negative pressure and gas density and flow; Purpose provides a kind of underground gas extraction pipeline concentration self-control early warning system and method for using thereof, improve and stable extraction pipeline in gas density, and the hidden danger of extraction pipeline implemented early warning.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
Underground gas extraction pipeline concentration self-control method for early warning, it comprises the steps:
1., the assembling of signal gathering unit and performance element is one, be installed on the gas pumping pipeline; Described signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Described performance element is made up of electrically operated valve;
2., operation execution unit, confirm the longest negative pressure lag time, maximum tube road gas density between pipeline gas density and the extraction negative pressure, thereby obtain the change curve of pipeline gas density and extraction negative pressure;
3., according to the longest negative pressure lag time and the maximum tube road gas density that obtain, set early warning gas density and early warning negative pressure lag time; Described early warning gas density setting value is lower than maximum tube road gas concentration, and is higher than the desired minimum of mash gas extraction; The early warning negative pressure is 1.5～2 times of the longest negative pressure lag time lag time;
4., gather current gas concentration and negative pressure value in real time; If current gas concentration greater than maximum tube road gas density, then points out maximum tube road gas density wrong, execution in step 2. again; If current gas concentration less than maximum tube road gas density, still greater than early warning gas density setting value, then keeps the electrically operated valve aperture constant; If current gas concentration less than early warning gas density setting value, then sends warning, search for best extraction negative pressure simultaneously, on best extraction negative pressure, continue mash gas extraction then;
5., after system runs well, regularly repeating step is 2.～4..
The pipeline B/P EGR Back Pressure Transducer EGR of signal gathering unit, gas concentration sensor, carbon monoxide transducer and piping flow tester are integrated to be installed in the pipe joint road, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
Described step 2. in; The mensuration of the longest negative pressure lag time is 90% or more to be closed to open 10% below from opening the electrically operated valve aperture; Begin at terminal a small amount of carbon monoxide of injection of pipeline and timing simultaneously, when the carbon monoxide transducer that is positioned at the electrically operated valve side detected CO, timing finished.
Described step 2. in; Through close the electrically operated valve of 1% ~ 5% angle at every turn; Wait for that the longest negative pressure is after lag time; Record pipeline concentration value and pipe negative pressure value repeat the change curve that this process can obtain pipeline gas density and extraction negative pressure, thereby confirm the negative pressure that maximum tube road gas density is corresponding.
Described step 4. in, the step of searching for best extraction negative pressure is: electrically operated valve is opened fully, wait for lag time after; Record initial concentration value C0, negative pressure value P0 and flow value Q0; Electrically operated valve is closed 1% ~ 5% angle, and wait is read new concentration value Ci, negative pressure value Pi and flow value Qi (i=1,2 after lag time; 3 ... N), the current electrically operated valve aperture Ki of record; When electrically operated valve aperture Ki＞=99%, stop to close the valve operation; And from concentration value Ci (i=0,1,2; 3 ... N) find out maximum value concentration value Cmax in; Judge then whether the corresponding negative pressure of Cmax is unique, if unique then give electric valve device the corresponding electrically operated valve aperture Ki of maximum value Cmax, if not unique then the valve opening Ki when higher gives electric valve device with negative pressure.
Implement the underground gas extraction pipeline concentration self-control early warning system of said method; Signalization collecting unit and performance element on the gas pumping pipeline; Wherein signal gathering unit connects the input of control module, and performance element connects the output of control module; Described signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Described performance element is made up of electrically operated valve.
Pipeline B/P EGR Back Pressure Transducer EGR in the said signal gathering unit, gas concentration sensor, carbon monoxide transducer and piping flow tester are integrated to be installed in the pipe joint road, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
Adopt the present invention of technique scheme; Coal seam situation to different mining areas; Study the change relation between different extraction stage extraction concentration and the extraction negative pressure, propose a kind of underground gas extraction pipeline concentration self-control early warning system and method for using thereof, pipeline gas pumping concentration is carried out the automatic regulation of science; Improve and stable pipeline in gas pumping concentration, satisfy the needs and the pipeline security needs of gas utilization within the specific limits.Pipeline safety described here is meant: as far as possible gas pumping concentration is adjusted to outside the blast limit; In addition early warning is carried out in the boring coal body spontaneous combustion of the gas leakage initiation of holing and the concentration rapid drawdown that conduit failure causes; To the negative pressure rapid drawdown in the extraction pipeline or when sporting malleation, valve-off rapidly.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is a structure chart of the present invention.
Fig. 3 is regulation and control early warning program flow diagram among the present invention.
Fig. 4 is best extraction negative pressure search utility flow chart among the present invention.
Fig. 5 is curve plotting program flow diagram among the present invention.
Fig. 6 is initial stage extraction borehole concentration and negative pressure graph of a relation.
Fig. 7 is later stage extraction borehole concentration and negative pressure graph of a relation.
The specific embodiment
Before design the present invention, done following analysis and research: the relation between different extraction stage gas pumping concentration and the gas pumping negative pressure changes, and different phase is different to the demand of negative pressure height, has a reasonable extraction negative pressure.As shown in Figure 6; The too high meeting of extraction initial stage negative pressure causes extraction concentration to reduce; Extraction negative pressure in mid-term is crossed the low extraction concentration that also can cause and is reduced, and extraction later stage pipeline gas density becomes nearly parabolic relation with the extraction negative pressure, and is as shown in Figure 7; Negative pressure is crossed and is exceeded the low extraction concentration reduction that all can cause, and has an extraction peak concentration.Based on above-mentioned discovery, the present invention can regulate pipeline extraction negative pressure automatically in the different extraction stage, stablizes gas pumping concentration, and the pipeline abnormal conditions are carried out early warning.
Among the present invention, underground gas extraction pipeline concentration self-control method for early warning, it comprises the steps:
1., the assembling of signal gathering unit and performance element is one, be installed on the gas pumping pipeline; Above-mentioned signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Above-mentioned performance element comprises valve and electric valve device.Better, can be installed in the pipe joint road pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and the piping flow tester of signal gathering unit are integrated, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
2., operation execution unit, confirm the longest negative pressure lag time, maximum tube road gas density between pipeline gas density and the extraction negative pressure, thereby obtain the change curve of pipeline gas density and extraction negative pressure.
Above-mentioned the longest negative pressure lag time is to confirm like this: because the gas pumping pipeline is very long; After regulating the electrically operated valve action of negative pressure so; Gas density in the pipeline will change, and the time that finally reaches new this process need of concentration value is exactly the longest negative pressure lag time.
In the time of actual the survey; The mensuration of the longest negative pressure lag time is 90% or more to be closed to open 10% below from opening the electrically operated valve aperture; Begin at terminal a small amount of carbon monoxide of injection of pipeline and timing simultaneously, when the carbon monoxide transducer that is positioned at the valve side detected CO, timing finished.Need to prove that the electrically operated valve aperture is fixing two apertures, after concentration stabilize under 90% aperture, valve is closed below 10%, injects CO simultaneously, when waiting CO to be diffused into sensor, just can think that the interior concentration of pipeline this moment has reached evenly.The time of record is exactly that CO is diffused into the needed time of sensor position from the pipeline end in fact.
Above-mentioned maximum tube road gas density is to confirm like this: the process of will be above-mentioned definite the longest negative pressure lag time is repeatedly carried out; Each process all increases negative pressure through the valve of closing certain angle; Just can obtain one group of corresponding curve, the change curve of Here it is pipeline gas density and extraction negative pressure by concentration and negative pressure.When negative pressure was increased to a certain degree, concentration no longer rose in the pipeline, can descend on the contrary sometimes.This be because, the pipeline seal is good inadequately, the negative pressure increase causes the pipeline air leakage to increase, and then has reduced gas density in the pipeline.When curve has been confirmed, the negative pressure of so corresponding maximum tube road gas density is just decided.During practical implementation; Through close in 1%, 2%, 3%, 4%, 5% valve at any angle at every turn; Wait for the longest negative pressure after lag time, record pipeline concentration value and pipe negative pressure value repeat the change curve that this process can obtain pipeline gas density and extraction negative pressure.
3., according to the longest negative pressure lag time and the maximum tube road gas density that obtain, set early warning gas density and early warning negative pressure lag time; Above-mentioned early warning gas density setting value is lower than maximum tube road gas concentration, and is higher than the desired minimum of mash gas extraction; The early warning negative pressure is 1.5～2 times of the longest negative pressure lag time lag time.
Early warning gas density setting value is to set according to the requirement on the ore deposit, different collieries, and the value of setting is different, and the gas density that requires that has will reach 30%, and what have requires 25%.What also have has only 5%, and the methane gas that such concentration is got on ground can be used for generating electricity, and heat supply etc. also can store, and concentration is crossed low can directly being discharged in the atmosphere.Setting early warning gas density and early warning negative pressure these two parameters lag time, is for the gas density that guarantees to release in the gas pipeline meets the ground service condition, when gas density in the pipeline does not reach the early warning gas density of setting, reports to the police.And set early warning negative pressure lag time is to guarantee that gas density reaches uniform and stable in the pipeline, is unlikely to when concentration reaches even, not report to the police in advance.
4., gather current gas concentration and negative pressure value in real time; If current gas concentration greater than maximum tube road gas density, then points out maximum tube road gas density wrong, execution in step 2. again; If current gas concentration less than maximum tube road gas density, still greater than early warning gas density setting value, then keeps valve opening constant; If current gas concentration less than early warning gas density setting value, then sends warning, search for best extraction negative pressure simultaneously, on best extraction negative pressure, continue mash gas extraction then.
Above-mentioned step 4. in, the step of searching for best extraction negative pressure is: valve is opened fully, wait for lag time after; Record initial concentration value C0, negative pressure value 0 and flow value Q0; Electrically operated valve is closed 1% ~ 5% angle, and wait is read new concentration value Ci, negative pressure value Pi and flow value Qi (i=1,2 after lag time; 3 ... N), the current electrically operated valve aperture Ki of record; When electrically operated valve aperture Ki＞=99%, stop to close the valve operation; And from concentration value Ci (i=0,1,2; 3 ... N) find out maximum value concentration value Cmax in; Judge then whether the corresponding negative pressure of Cmax is unique, if unique then give electric valve device the corresponding electrically operated valve aperture Ki of maximum value Cmax, if not unique then the valve opening Ki when higher gives electric valve device with negative pressure.
5., after system runs well, regularly repeating step is 2.～4..Above-mentioned regularly is meant: because in system works after 1 year or 2 years, very big variation has all taken place parameters such as the pressure of down-hole, gas density, need proofread and correct and adjust lag time concentration, concentration and the negative pressure set again.
Underground gas extraction pipeline concentration self-control early warning system of the present invention and method for using thereof; The image data signal of the various parameters that send according to signal gathering unit of processing unit at first; Judge gas density in the gas pumping pipeline whether greater than setting concentration value, if greater than, performance element is failure to actuate; If near or less than setting concentration value; The action of processing unit drives execution element is regulated the gas pumping negative pressure in the pipeline through the valve opening of performance element, and reasonable extraction negative pressure is searched in the amenable to process instruction; Rationally the extraction negative pressure is meant that gas pumping concentration is higher than the setting concentration value under this negative pressure, and the pure methane flow is that maximum negative pressure under this concentration.In addition, when processing unit received the carbon monoxide signal, prewarning unit was carried out carbon monoxide and is reported to the police; When processing unit detected gas density sudden change situation, prewarning unit was carried out concentration and is reported to the police.Processing unit at display unit shows directly that according to the signal that sensor and tester obtain the extraction scale in the gas unit interval is calculated by program.
The present invention also provides a kind of underground gas extraction pipeline concentration self-control early warning system; It is signalization collecting unit 4 and performance element 1 on the gas pumping pipeline; Wherein signal gathering unit 4 connects the input of control module 3; Performance element 1 connects the output of control module 3, and above-mentioned control module 3 is made up of switch board 8 and the programmable logic controller 7 that is arranged in switch board.Above-mentioned signal gathering unit 4 is a sensor groups 6, and sensor groups 6 comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Performance element comprises valve and electric valve device.
Better; Can be installed in the pipe joint road the pipeline B/P EGR Back Pressure Transducer EGR in the signal gathering unit, gas concentration sensor, carbon monoxide transducer and piping flow tester are integrated; This pipe joint road is positioned on the gas pumping main line 9, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
Signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester etc. in the such scheme, its signal that collects is inserted the input of processing unit respectively.Performance element is a numerical control electric valve 2, and it comprises valve and electric device for valve two parts.The numerical control electric valve receives the control signal from processing unit, can carry out operations such as standard-sized sheet, full cut-off, crawl are opened, crawl pass; The accurate aperture of control valve, and the opening information of valve fed back to processing unit.The control signal of numerical control electric valve links to each other with the processing unit output node, and the valve opening signal of numerical control electric valve links to each other with processing unit input node.Processing unit is a programmable logic controller, and display unit can be LCD, LED or touch-screen.
Claims (7)
1. a underground gas extraction pipeline concentration self-control method for early warning is characterized in that it comprises the steps:
1., the assembling of signal gathering unit and performance element is one, be installed on the gas pumping pipeline; Described signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Described performance element is made up of electrically operated valve;
2., operation execution unit, confirm the longest negative pressure lag time, maximum tube road gas density between pipeline gas density and the extraction negative pressure, thereby obtain the change curve of pipeline gas density and extraction negative pressure;
3., according to the longest negative pressure lag time and the maximum tube road gas density that obtain, set early warning gas density and early warning negative pressure lag time; Described early warning gas density setting value is lower than maximum tube road gas concentration, and is higher than the desired minimum of mash gas extraction; The early warning negative pressure is 1.5～2 times of the longest negative pressure lag time lag time;
4., gather current gas concentration and negative pressure value in real time; If current gas concentration greater than maximum tube road gas density, then points out maximum tube road gas density wrong, execution in step 2. again; If current gas concentration less than maximum tube road gas density, still greater than early warning gas density setting value, then keeps the electrically operated valve aperture constant; If current gas concentration less than early warning gas density setting value, then sends warning, search for best extraction negative pressure simultaneously, on best extraction negative pressure, continue mash gas extraction then;
5., after system runs well, regularly repeating step is 2.～4..
2. underground gas extraction pipeline concentration self-control method for early warning according to claim 1; It is characterized in that: the pipeline B/P EGR Back Pressure Transducer EGR of signal gathering unit, gas concentration sensor, carbon monoxide transducer and piping flow tester are integrated to be installed in the pipe joint road, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
3. underground gas extraction pipeline concentration self-control method for early warning according to claim 1; It is characterized in that: described step 2. in; The mensuration of the longest negative pressure lag time is 90% or more to be closed to open 10% below from opening the electrically operated valve aperture; Begin at terminal a small amount of carbon monoxide of injection of pipeline and timing simultaneously, when the carbon monoxide transducer that is positioned at the electrically operated valve side detected CO, timing finished.
4. underground gas extraction pipeline concentration self-control method for early warning according to claim 1; It is characterized in that: described step 2. in; Through close the electrically operated valve of 1% ~ 5% angle at every turn, wait for the longest negative pressure after lag time, record pipeline concentration value and pipe negative pressure value; Repeat the change curve that this process can obtain pipeline gas density and extraction negative pressure, thereby confirm the negative pressure that maximum tube road gas density is corresponding.
5. underground gas extraction pipeline concentration self-control method for early warning according to claim 1 is characterized in that: described step 4. in, the step of searching for best extraction negative pressure is: electrically operated valve is opened fully; After waiting for lag time, record initial concentration value C0, negative pressure value P0 and flow value Q0 close 1% ~ 5% angle with electrically operated valve; Read new concentration value Ci, negative pressure value Pi and flow value Qi (i=1 after waiting for lag time; 2,3 ... N), the current electrically operated valve aperture Ki of record; When electrically operated valve aperture Ki＞=99%, stop to close the valve operation; And from concentration value Ci (i=0,1,2; 3 ... N) find out maximum value concentration value Cmax in; Judge then whether the corresponding negative pressure of Cmax is unique, if unique then give electric valve device the corresponding electrically operated valve aperture Ki of maximum value Cmax, if not unique then the valve opening Ki when higher gives electric valve device with negative pressure.
6. implement the underground gas extraction pipeline concentration self-control early warning system of the arbitrary said method of claim 1～5; It is characterized in that: signalization collecting unit and performance element on the gas pumping pipeline; Wherein signal gathering unit connects the input of control module, and performance element connects the output of control module; Described signal gathering unit comprises pipeline B/P EGR Back Pressure Transducer EGR, gas concentration sensor, carbon monoxide transducer and piping flow tester; Described performance element is made up of electrically operated valve.
7. underground gas extraction pipeline concentration self-control early warning system according to claim 6; It is characterized in that: the pipeline B/P EGR Back Pressure Transducer EGR in the said signal gathering unit, gas concentration sensor, carbon monoxide transducer and piping flow tester are integrated to be installed in the pipe joint road, and this pipe joint road is installed on the lower side of electric valve device negative pressure.
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Inventor after: Sun Yuning Inventor after: Wang Taihua Inventor after: Wang Zhenfeng Inventor after: Zhang Tao Inventor after: Feng Haichao Inventor after: Wang Yonglong Inventor after: Zhang Haijun Inventor after: Guo Yu Inventor before: Sun Yuning Inventor before: Wang Taihua Inventor before: Zhang Haijun Inventor before: Feng Haichao Inventor before: Wang Zhenfeng Inventor before: Wang Yonglong Inventor before: Guo Yu |
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