CN103122772B - Method for judging burst accident in early burst happening period rapidly and predicting gas discharge scale - Google Patents
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Abstract
The invention discloses a method for judging a burst accident in an early burst happening period rapidly and predicting gas discharge scale. The method comprises: a system used for judging the bust accident and predicting the gas discharge scale is provided, data detected by each gas sensor in the system are transmitted to a pre-caution server in real time through a monitoring data communication branch station, analysis is conducted to the detected data by the pre-caution server, and whether burst happens or not is judged; and when a burst happens according to the judgment, prediction is conducted to gas gushing amount of the burst, burst lasting time, gas countercurrent range and the like according to data detected by a second gas sensor and a fourth gas sensor or by a predicting mold. The method can judge the burst accident rapidly in the early happening period of a coal and gas burst accident and can predict the gas gushing amount, the burst lasting time and the gas countercurrent range rapidly, and therefore further enlargement of the accident is prevented, and meanwhile the method is pretty helpful for timely rescue to the accident, accident avoiding to under well staff, control measures after the accident and the like.
Description
Technical field
The present invention relates to Mine Disaster Relief technical field, particularly relate to a kind of coal and gas prominent early period of origination, the method for accident and fast prediction gas emission, outstanding duration and gas reflux scope (Gas scale and gas reflux scope) can be given prominence to by quick recognition.
Background technology
Coal and gas prominent accident is one of disaster the most serious in coal production process, and one of coal and gas prominent phenomenon is the most serious, harmfulness is maximum country occurs in the world in China.Spray a large amount of coal dust, a large amount of gas of also gushing out in outstanding process, can directly destroy by rush of water roadway support and facility, destroys ventilation system, flood personnel, cause personnel and property loss.In addition, in the process of outstanding high concentration gas outside diffusion, discharge mine, also may threaten " safety " region at nominal conditions, produce the second accidents such as gas explosion.
Coal and gas prominent is global problem.In mechanism, " comprehensive function hypothesis ", owing to considering the outstanding active force of generation and the principal element of medium two aspects comprehensively, obtains the accreditation of domestic and international Most scholars.Coal and Gas Outbursts Prediction, prevent and treat in, also achieve considerable achievement.But due to the complexity of coal and gas prominent disaster, the many factors that impact is outstanding, up to the present, also do not grasp completely the mechanism that disaster outstanding under various geology, mining conditions occurs, the accuracy of prediction is also inadequate.Under current technical condition, also cannot accomplish the generation of thoroughly eradicating outstanding disaster, also there is no effective coal and gas prominent diaster prevention and control method.
After outstanding generation, outstanding high concentration gas can spread and propagate in roadway network.The place of " safety " under comparatively far away or normal condition at distance accident spot, if personnel in the pit fails to learn the outstanding warning occurred in time, still in normal operation, the catastrophic failure such as just likely such as gas explosion can occur, adverse current is suffocated, causes gas accident to expand further.Therefore, coal and gas prominent accident early period of origination, if can give prominence to accident and fast prediction Gas scale and gas reflux scope, the further expansion that not only can prevent disasters by quick recognition, and is very helpful to carrying out in time of accident rescue.
At present, existing research is all that the gas emission after terminating for outstanding accident calculates, and judges outstanding scale to the quick recognition in outstanding process, fast, and instructs the system of rescue and secondary disaster prevention or method not yet to find report with this.Wherein, obtaining outstanding after gas to gush out the method for scale, is all after outstanding accident terminates, based on gas density and air quantity, such as have following several: after (1) coal and gas prominent occurs, each mine is generally average gas density is multiplied by the air quantity before giving prominence to; (2) outstanding gas emission is considered as outstanding before and after gas emission value added, according to the measured value Changing Pattern of return airway gas density and air quantity, to adopt after curve integration again, or the method adopting segmentation to average; (3) at each tunnel place of projecting point medium and long distance, utilize gas concentration sensor and monitoring mining software, calculate the product of gas density, air quantity, time respectively, then sue for peace, obtain outstanding after gas outburst amount.These three kinds of methods can calculate outstanding after gas outburst amount, but these methods are all after accident terminates, and obtained, miss the time of accident rescue and preventing secondary disaster by centering, at a distance gas concentration sensor approximate calculation.
In addition, in outstanding process, Gas Outburst scale is difficult to quick judgement, except due to gas emission large, cause distinguished and admirable disorder near projecting point, outside the reasons such as air quantity is unstable, also because site plant is destroyed seriously by the gas gushed out with coal body of dishing out, and the reason such as gas density is too high, power-off, cause the gas concentration sensor near projecting point, quit work very soon after coal and gas prominent occurs.Therefore, it is often very difficult that the gas concentration sensor completely near dependence projecting point carries out statistical analysis to gas emission, or even unpractical.
Summary of the invention
Task of the present invention is to provide a kind of outstanding early period of origination quick recognition to give prominence to the method for accident and prediction Gas scale.
Its technical solution is:
Outstanding early period of origination quick recognition gives prominence to a method for accident and prediction Gas scale, comprises the steps:
A provides a kind of for sentencing the system knowing outstanding accident and prediction Gas scale, and this system comprises gas concentration sensor group, optical cable, monitored data communication substation, central computer, Warning Service device, LAN, terminal, alarm, the data-signal of gas concentration sensor group monitoring is through monitored data communication substation, by optical cable input Warning Service device, central computer provides the data of related-data handling module in Warning Service device, and Warning Service device connects terminal by LAN, and terminal connects alarm, above-mentioned gas concentration sensor group comprises: its first gas concentration sensor arranged with intersection location 10 meters of of going up a hill of distance in digging laneway, the second gas concentration sensor that distance itself and digging laneway intersection location 10 meters of are arranged respectively in going up a hill and the 3rd gas concentration sensor, the 4th gas concentration sensor that distance second gas concentration sensor 80 meters of are arranged in going up a hill, the 5th gas concentration sensor arranged in the return airway of work plane, the 6th gas concentration sensor arranged in the air intake lane of work plane, the 7th gas concentration sensor arranged in the main haulage roadway of work plane,
B utilizes central computer and Warning Service device, set up according to actual tunnel situation comprise digging laneway, go up a hill, tailentry, work plane air intake lane and main haulage roadway two-dimensional physical model; 2 gas concentration monitoring points are set in physical model, and arrange the second virtual gas concentration sensor and the 4th virtual gas concentration sensor, for simulating the second gas concentration sensor in said system and the 4th gas concentration sensor respectively, analogue data according to two virtual gas concentration sensors sets up forecast model, and the mathematic(al) representation of this forecast model is:
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t
1for second and the 4th the gas density that records of virtual gas concentration sensor rise to 40% time time difference; t
2the time difference when gas density recorded for the 4th virtual gas concentration sensor rises to 80% by 5%; a
i, b
i, c
i(i=1,2,3) and α and β are fitting constants;
The monitored data of each gas concentration sensor in step a is real-time transmitted to Warning Service device by c, when Sensor monitoring is abnormal to gas density, and gas concentration data in the digging laneway monitored according to the first, the 3rd gas concentration sensor, when being judged as outstanding generation, enter prediction steps, and will predict the outcome by local network transport to terminal, and reported to the police by alarm; Above-mentioned prediction steps specifically comprises:
(1) when the gas consistency peak of the second gas concentration sensor monitoring is less than 2%, then predict that this outstanding gas emission is less than 400m
3, the outstanding duration more than 15s, and does not cause gas reflux, and outstanding gas all will flow discharge mine with the wind;
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 2% and is less than 80%, then predict that this outstanding gas emission is less than 1000m
3, adverse current length is less than 50m;
(3) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 80%, then predict that this outstanding gas emission is less than 2000m
3, adverse current length is less than 80m;
(4) when the gas consistency peak of the 4th gas concentration sensor monitoring is greater than 40%, then the forecast model in step b is utilized to predict this outstanding gas emission, outstanding duration and adverse current length.
Above-mentioned steps c also comprises:
The gas density monitored in digging laneway when the first gas concentration sensor exceedes setting gas density limit, then judge whether to occur to give prominence to according to the monitored data of the first, the 3rd gas concentration sensor, Rule of judgment is specially:
1. the gas consistency peak that the first, the 3rd gas concentration sensor monitors all is greater than 50%;
2. the gas density that monitors of the first, the 3rd gas concentration sensor is all less than 30 seconds by the time that 5% rises to 50%;
When 1., 2. set up simultaneously time, be judged as outstanding generation; Otherwise be judged as giving prominence to.
In the mathematic(al) representation of above-mentioned steps b, a
1=5.0, b
1=24.1, c
1=-9.5, a
2=3001.8, b
2=-8990.1, c
2=13975.7, a
3=4.1, b
3=-1.7, c
3=0.043, α=-0.9, β=-0.55.
Above-mentioned outstanding early period of origination quick recognition gives prominence to the method for accident and prediction Gas scale, also comprises step:
D is when the data that the 5th, the 6th gas concentration sensor is monitored occur abnormal, and the personnel in reply return airway, work plane, air intake lane warn; If the data of the 7th gas concentration sensor monitoring occur abnormal, then the lower all regions of wind direction of reply are warned.
Relative to prior art, the invention has the beneficial effects as follows:
1. traditional gas emission calculates and all carries out after accident terminates.The present invention can in the outstanding accident of coal and gas prominent accident early period of origination quick recognition (judgement), fast prediction gas emission, outstanding duration and gas reflux scope, the further expansion that not only can prevent disasters, and to accident carry out in time rescue, personnel in the pit keep away calamity, calamity after control measure etc. be very helpful.
2. in tunnel, variation ofgas density is the phenomenon occurred at first after coal and gas prominent occurs, the present invention not exclusively relies on the gas concentration sensor total data near projecting point, just by gathering the initial valid data of the gas concentration sensor acquisition near projecting point, mainly utilize forecast model, carry out quick recognition and give prominence to and fast prediction Gas scale.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is further described:
Fig. 1 is the structural principle schematic block diagram of the system in the present invention.
Fig. 2 is that Roadway model in the present invention and gas concentration sensor arrange schematic diagram.
Fig. 3 is that the Gas Outburst in the present invention is schemed with concentrations versus during other gas exceptions.
The gas density that Fig. 4 records for second in the present invention and the 4th gas virtual-sensor and outstanding duration variation relation figure.
In figure, 1. gas concentration sensor group, 2. optical cable, 3. monitored data communication substation, 4. Warning Service device, 5. LAN, 6. terminal, 7. alarm, 8. central computer, 9. digging laneway, 10. projecting point, 11. go up a hill, 12. tailentries, 13. coal-faces, 14. work plane air intake lanes, 15. main haulage roadways, 101. first gas concentration sensors, 102. second gas concentration sensors, 103. the 3rd gas concentration sensors, 104. the 4th gas concentration sensors, 105. the 5th gas concentration sensors, 106. the 6th gas concentration sensors, 107. the 7th gas concentration sensors.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
See Fig. 1, first utilize central computer (personal workstation) to set up prognoses system software, and be placed in Warning Service device; The real time data that fire damp concentration sensor monitors is transferred to Warning Service device by monitored data communication substation, and analyzes data in Warning Service device, draws analysis result; Analysis result is shown by LAN in terminal, and is optionally undertaken reporting to the police or make corresponding prompting by alarm.
See Fig. 2, suppose that digging laneway has outburst hazard, known digging laneway size, the cross dimensions of going up a hill and the wind speed of going up a hill, gas concentration sensor is laid at each ad-hoc location, 7 gas concentration sensors can be set so that fast, accurately, sentence all sidedly to know and give prominence to and predict outstanding scale, be specially: distance digging laneway and intersection location 10 meters of layout first gas concentration sensors of going up a hill in digging laneway, in going up a hill, distance is gone up a hill and is arranged the second gas concentration sensor and the 3rd gas concentration sensor respectively with digging laneway intersection location 10 meters of, at distance the second gas concentration sensor 80 meters of layouts the 4th gas concentration sensor, at the return airway of work plane, air intake lane, the 5th is arranged respectively in main haulage roadway, 6th, 7th gas concentration sensor.
Gas density that above-mentioned gas concentration sensor monitors is abnormal, according to reality generally have outstanding, blow out, the situations such as fault of ventilating.In these situations, the change curve of gas density is see Fig. 3.When there is Gas Outburst, variation ofgas density as curve 1. shown in, be characterized in that the concentration rate of climb is fast, the most high methane concentration value reached is comparatively large, long in the high concentration duration; Under other gas abnormal conditions, variation ofgas density as curve 2., 3. shown in, be characterized in that gas density rises relatively slow, the time continued when maximum concentration is short etc.
Accordingly, the gas exceeding limit (as gas density >1%) in digging laneway is monitored when the first gas concentration sensor, then can judge whether fast to occur to give prominence to according to the data of the first, the 3rd gas concentration sensor, judgment criterion is specially: the gas consistency peak that (1) first, the 3rd gas concentration sensor monitors all is greater than 50%; The gas density that (2) first, the 3rd gas concentration sensor monitors all is less than 30 seconds by the time that 5% rises to 50%.When condition (1) and (2) are set up simultaneously, outstanding generation can be judged; Otherwise be judged as not giving prominence to, then cause gas density exception reason may for blow out or coal petrography stress changes.Now give corresponding warning or prompting by terminal and alarm.
Utilize central computer and Warning Service device, according to actual parameter, use numerical simulation software to set up to comprise digging laneway, go up a hill, tailentry, work plane air intake lane and main haulage roadway two-dimensional physical model.Wherein simulated digging laneway and the cross dimensions of going up a hill are 4m × 3m, and the wind speed of going up a hill is 3m/s;
2 gas concentration monitoring points are set in physical model, and the second virtual gas concentration sensor and the 4th virtual gas concentration sensor are installed, the second, the 4th gas concentration sensor and installation position thereof respectively in corresponding above-mentioned actual conditions.Analogue data according to two virtual gas concentration sensors sets up forecast model, and the mathematic(al) representation of this forecast model is:
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t
1for second and the 4th the gas density that records of gas virtual-sensor rise to 40% time time difference, i.e. t
1be the 4th virtual gas concentration sensor gas density rise to 40% moment and the second virtual gas concentration sensor gas density rise to the difference in the moment of 40%; t
2the time difference when gas density recorded for the 4th gas virtual-sensor rises to 80% by 5%, i.e. t
2it it is the 4th virtual gas concentration sensor gas density moment of rising to 80% and the difference in moment when rising to 5%; a
i, b
i, c
i(i=1,2,3) and α and β are fitting constants.
Such as: choosing gas emission Q is 3600m
3, the outstanding duration is T is 30s, and after simulation coal and gas prominent, gas is migrated decay in underground network.After simulation, obtaining this outstanding adverse current length is 112m, extracts the gas density data of above-mentioned two monitoring points, as curve in accompanying drawing 4 4. and 5. shown in.Time t when the gas density obtaining the 4th virtual gas concentration sensor position place rises to 80% by 5%
2for 3.8s, the gas density of the second, the 4th virtual gas concentration sensor rises to time difference t when 40%
1for 13.1s.Change gas emission Q and outstanding duration T carry out numerical simulation calculation respectively, obtain the t under different operating mode
1and t
2value; Matching t
1, t
2and the relation between gas emission Q, outstanding duration T and gas reflux length L, obtain fitting coefficient a
i, b
i, c
ithe value of (i=1,2,3) and α and β, above-mentioned formula (1) can be written as:
The monitored data of above-mentioned gas concentration sensor group can be real-time transmitted to Warning Service device, occur abnormal when some gas concentration sensor monitors gas density, and the gas density data in the digging laneway monitored according to the first, the 3rd gas concentration sensor 3, when utilizing Rule of judgment (criterion) to be judged as outstanding generation, forecast model in the gas density data of the second, the 4th gas concentration sensor record and/or Warning Service device can be utilized to predict this outstanding scale; And will predict the outcome and be transferred to terminal computer 6 by LAN 5, and report to the police in alarm 7.Prediction steps is specially:
(1) when the gas consistency peak of the second gas concentration sensor monitoring is less than 2%, then predict that this outstanding gas emission is less than 400m
3, the outstanding duration more than 15s, and does not cause gas reflux, and outstanding gas all will flow discharge mine with the wind.
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 2% and is less than 80%, then predict that this outstanding gas emission is less than 1000m
3, adverse current length is less than 50m.
(3) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 80%, then predict that this outstanding gas emission is less than 2000m
3, adverse current length is less than 80m.
(4) (or be less than 40% when the gas consistency peak of the 4th gas concentration sensor monitoring is greater than 2% when the gas consistency peak of the 4th gas concentration sensor monitoring is greater than 40%, then set t
1be the gas density of the second, the 4th gas concentration sensor time difference when rising to the gas consistency peak of the 4th gas concentration sensor monitoring), then can utilize the t that formula (2) and actual monitoring arrive
1, t
2value, predicts this outstanding gas emission, outstanding duration and adverse current length.
The early warning of the present invention to other regions is as follows, and when the data of the 5th, the 6th gas concentration sensor monitoring occur abnormal, illustrate that gas of gushing out has influence on stope, the personnel in reply return airway, work plane, air intake lane warn; If the data of the 7th gas concentration sensor monitoring occur abnormal, then the lower all regions of wind direction of reply are warned.
The relevant technologies content do not addressed in aforesaid way is taked or uses for reference prior art to realize.
It should be noted that, under the instruction of this manual, those skilled in the art can also make such or such easy variation pattern, such as equivalent way, or obvious mode of texturing.Above-mentioned variation pattern all should within protection scope of the present invention.
Claims (4)
1. outstanding early period of origination quick recognition gives prominence to a method for accident and prediction Gas scale, it is characterized in that comprising the steps:
A provides a kind of for sentencing the system knowing outstanding accident and prediction Gas scale, and this system comprises gas concentration sensor group, optical cable, monitored data communication substation, central computer, Warning Service device, LAN, terminal, alarm, the data-signal of gas concentration sensor group monitoring is through monitored data communication substation, by optical cable input Warning Service device, central computer provides the data of related-data handling module in Warning Service device, and Warning Service device connects terminal by LAN, and terminal connects alarm, above-mentioned gas concentration sensor group comprises: its first gas concentration sensor arranged with intersection location 10 meters of of going up a hill of distance in digging laneway, the second gas concentration sensor that, 10 meters, side, upstream of itself and digging laneway intersection location of distance is arranged in going up a hill, the 3rd gas concentration sensor that, 10 meters, side, downstream is arranged, the 4th gas concentration sensor that distance second gas concentration sensor 80 meters of are arranged in going up a hill, the 5th gas concentration sensor arranged in the return airway of work plane, the 6th gas concentration sensor arranged in the air intake lane of work plane, the 7th gas concentration sensor arranged in the main haulage roadway of work plane,
B utilizes central computer and Warning Service device, set up according to actual tunnel situation comprise digging laneway, go up a hill, tailentry, work plane air intake lane and main haulage roadway two-dimensional physical model; 2 gas concentration monitoring points are set in physical model, and arrange the second virtual gas concentration sensor and the 4th virtual gas concentration sensor, for simulating the second gas concentration sensor in said system and the 4th gas concentration sensor respectively, analogue data according to two virtual gas concentration sensors sets up forecast model, and the mathematic(al) representation of this forecast model is:
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t
1for second and the 4th the gas density that records of virtual gas concentration sensor rise to 40% time time difference; t
2the time difference when gas density recorded for the 4th virtual gas concentration sensor rises to 80% by 5%; a
i, b
i, c
i(i=1,2,3) and α and β are fitting constants;
The monitored data of each gas concentration sensor in step a is real-time transmitted to Warning Service device by c, when Sensor monitoring is abnormal to gas density, and gas concentration data in the digging laneway monitored according to the first, the 3rd gas concentration sensor, when being judged as outstanding generation, enter prediction steps, and will predict the outcome by local network transport to terminal, and reported to the police by alarm; Above-mentioned prediction steps specifically comprises:
(1) when the gas consistency peak of the second gas concentration sensor monitoring is less than 2%, then predict that this outstanding gas emission is less than 400m
3, the outstanding duration more than 15s, and does not cause gas reflux, and outstanding gas all will flow discharge mine with the wind;
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 2% and is less than 80%, then predict that this outstanding gas emission is less than 1000m
3, adverse current length is less than 50m;
(3) when the gas consistency peak of the 4th gas concentration sensor monitoring is less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring is greater than 80%, then predict that this outstanding gas emission is less than 2000m
3, adverse current length is less than 80m;
(4) when the gas consistency peak of the 4th gas concentration sensor monitoring is greater than 40%, then the forecast model in step b is utilized to predict this outstanding gas emission, outstanding duration and adverse current length.
2. a kind of outstanding early period of origination quick recognition according to claim 1 gives prominence to the method for accident and prediction Gas scale, it is characterized in that: above-mentioned steps c also comprises:
The gas density monitored in digging laneway when the first gas concentration sensor exceedes setting gas density limit, then judge whether to occur to give prominence to according to the monitored data of the first, the 3rd gas concentration sensor, Rule of judgment is specially:
1. the gas consistency peak that the first, the 3rd gas concentration sensor monitors all is greater than 50%;
2. the gas density that monitors of the first, the 3rd gas concentration sensor is all less than 30 seconds by the time that 5% rises to 50%;
When 1., 2. set up simultaneously time, be judged as outstanding generation; Otherwise be judged as giving prominence to.
3. a kind of outstanding early period of origination quick recognition according to claim 1 gives prominence to the method for accident and prediction Gas scale, it is characterized in that: in the mathematic(al) representation of above-mentioned steps b, a
1=5.0, b
1=24.1, c
1=-9.5, a
2=3001.8, b
2=-8990.1, c
2=13975.7, a
3=4.1, b
3=-1.7, c
3=0.043, α=-0.9, β=-0.55.
4. a kind of outstanding early period of origination quick recognition according to claim 1 gives prominence to the method for accident and prediction Gas scale, characterized by further comprising step:
D is when the data that the 5th, the 6th gas concentration sensor is monitored occur abnormal, and the personnel in reply return airway, work plane, air intake lane warn; If the data of the 7th gas concentration sensor monitoring occur abnormal, then the lower all regions of wind direction of reply are warned.
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| CN104074545B (en) * | 2014-04-22 | 2016-09-07 | 煤科集团沈阳研究院有限公司 | Coal and gas prominent monitoring system and monitoring method |
| CN105484795A (en) * | 2015-12-15 | 2016-04-13 | 中煤科工集团重庆研究院有限公司 | Recognition method for underground coal mine gas anomalous change |
| CN105866373B (en) * | 2016-03-25 | 2017-11-03 | 安徽理工大学 | A kind of new method of discrimination of coal and gas dynamical disaster |
| CN107313808A (en) * | 2016-06-12 | 2017-11-03 | 中国石油化工股份有限公司 | Inflammable gas concentration monitor and the method for early warning |
| CN111859258B (en) * | 2020-08-06 | 2023-11-03 | 中煤科工集团重庆研究院有限公司 | Method for rapidly judging and identifying abnormal change time of gas concentration of roadway during outburst |
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| CN101539030B (en) * | 2009-04-15 | 2011-04-13 | 中铁二局股份有限公司 | Method for forecasting gas by adopting sparse coefficient auto-regression model |
| CN101550841B (en) * | 2009-05-08 | 2011-09-28 | 煤炭科学研究总院重庆研究院 | Coal and gas outburst hazard early warning system and early warning method |
| CN201412183Y (en) * | 2009-06-10 | 2010-02-24 | 中国矿业大学 | Real-time monitoring and early warning device for mine gas outburst |
| CN101787897B (en) * | 2009-12-30 | 2013-05-22 | 西安西科测控设备有限责任公司 | System and method for predicting coal and gas outburst risk of mine in real time |
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