CN103122772A - Method for judging burst accident in early burst happening period rapidly and predicting gas discharge scale - Google Patents

Method for judging burst accident in early burst happening period rapidly and predicting gas discharge scale Download PDF

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CN103122772A
CN103122772A CN2013100332411A CN201310033241A CN103122772A CN 103122772 A CN103122772 A CN 103122772A CN 2013100332411 A CN2013100332411 A CN 2013100332411A CN 201310033241 A CN201310033241 A CN 201310033241A CN 103122772 A CN103122772 A CN 103122772A
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gas
concentration sensor
gas concentration
outstanding
accident
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CN2013100332411A
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CN103122772B (en
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程国强
胡千庭
赵旭升
谭云亮
武文宾
田静萍
于海峰
朱学亮
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山东科技大学
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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

The method of the outstanding accident of outstanding early period of origination quick recognition and prediction Gas scale
Technical field
The present invention relates to the Mine Disaster Relief technical field, relate in particular to a kind of coal and Gas Outburst early period of origination, the method for can quick recognition outstanding accident and fast prediction gas emission, outstanding duration and gas reflux scope (Gas scale and gas reflux scope).
Background technology
Coal and gas burst accident are one of disasters the most serious in the coal production process, and one of coal and the Gas Outburst phenomenon is the most serious, harmfulness is maximum country occur in the world in China.The a large amount of coal dusts of ejection in outstanding process, a large amount of gas of also can gushing out, can directly destroy by rush of water roadway support and facility destroy ventilation system, flood personnel, cause personnel and property loss.In addition, outstanding high concentration gas also may threaten " safety " zone under normal condition in diffusion, discharging the process outside mine, produce the second accidents such as gas explosion.
Coal and Gas Outburst are global problems.Aspect mechanism, " comprehensive function hypothesis " obtained the approval of domestic and international Most scholars due to the principal element of the active force of having considered outstanding generation and medium two aspects comprehensively.In coal and gas outbursts Prediction, prevent and treat aspect, also obtained considerable achievement.But due to the complexity of coal and Gas Outburst disaster, up to the present the many factors that impact is outstanding, is not also grasped fully to the mechanism that outstanding disaster under various geology, mining conditions occurs, and the accuracy of prediction is also inadequate.Under present technical condition, also can't accomplish thoroughly to eradicate the generation of outstanding disaster, there is no effective coal and Gas Outburst diaster prevention and control method yet.
After outstanding the generation, outstanding high concentration gas can spread in the roadway network and propagate.The place of " safety " under far away or normal condition at the distance accident spot, if the personnel in the pit fails in time to learn the outstanding warning that occurs, still in normal operation, just might occur to cause gas accident further to enlarge such as gas explosion, the adverse current catastrophic failure such as suffocate.Therefore, coal and gas burst accident early period of origination, if can give prominence to accident and fast prediction Gas scale and gas reflux scope by quick recognition, the further expansion that not only can prevent disasters, and in time carrying out of accident rescue is very helpful.
At present, existing research is all that the gas emission after finishing for outstanding accident calculates, and to the quick recognition in outstanding process, the outstanding scale of quick judgement, and instruct the system of rescue and secondary disaster prevention or method not yet to find to report with this.Wherein, obtaining the gush out method of scale of outstanding after gas, is all after outstanding accident finishes, take gas density and air quantity as basic, for example have following several: after coal and Gas Outburst occured (1), each mine was generally that average gas density be multiply by outstanding front air quantity; (2) outstanding gas emission is considered as outstanding before and after the gas emission value added, according to the measured value Changing Pattern of return airway gas density and air quantity, adopt after curve integration again, the method that perhaps adopts segmentation to average; (3) at each place, tunnel of projecting point medium and long distance, utilize gas concentration sensor and monitoring mining software, calculate respectively the product of gas density, air quantity, time, then summation obtains outstanding after gas outburst amount.These three kinds of methods can calculate outstanding after gas outburst amount, but these methods are all after accident finishes, and obtain by centering, remote gas concentration sensor approximate calculation, have missed the time of accident rescue and preventing secondary disaster.
In addition, in outstanding process, the Gas Outburst scale is difficult to quick judgement, except because gas emission is large, cause near the distinguished and admirable disorder of projecting point, outside the reasons such as air quantity shakiness, also because the site plant gas of being gushed out and the coal body of dishing out destroy seriously, and the reasons such as gas density is too high, outage, cause near the gas concentration sensor of projecting point, quit work very soon after coal and Gas Outburst generation.Therefore, relying near projecting point gas concentration sensor fully, that gas emission is carried out statistical analysis is often very difficult, or even unpractical.
Summary of the invention
Task of the present invention is to provide the method for the outstanding accident of a kind of outstanding early period of origination quick recognition and prediction Gas scale.
Its technical solution is:
The method of the outstanding accident of a kind of outstanding early period of origination quick recognition and prediction Gas scale comprises the steps:
it is a kind of be used to sentencing the system of knowing outstanding accident and prediction Gas scale that a provides, 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, input the Warning Service device by optical cable, central computer provides the data of related-data handling module in the Warning Service device, and the Warning Service device connects terminal by LAN, and terminal connects alarm, above-mentioned gas concentration sensor group comprises: the first gas concentration sensor of arranging apart from itself and intersection location 10 meters of going up a hill in digging laneway, at middle the second gas concentration sensor and the 3rd gas concentration sensor of arranging respectively apart from itself and digging laneway intersection location 10 meters of going up a hill, the 4th gas concentration sensor of arranging at middle distance the second gas concentration sensor 80 meters of going up a hill, the 5th gas concentration sensor of arranging in the return airway of work plane, the 6th gas concentration sensor of arranging in the air intake lane of work plane, the 7th gas concentration sensor of arranging 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, the two-dimentional physical model of tailentry, work plane air intake lane and main haulage roadway; 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, be used for simulating respectively the second gas concentration sensor and the 4th gas concentration sensor of said system, set up forecast model according to the analogue data of two virtual gas concentration sensors, the mathematic(al) representation of this forecast model is:
T = a 1 + b 1 t 1 + c 1 t 2 Q = a 2 + b 2 t 1 α + c 2 t 2 β L = a 3 + b 3 t 1 + c 3 t 2
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t 1It is gas density that the second and the 4th virtual gas concentration sensor the records time difference when rising to 40%; t 2It is gas density that the 4th virtual gas concentration sensor the records time difference when rising to 80% by 5%; a i, b i, c i(i=1,2,3) and α and β are fitting constants;
C is real-time transmitted to the Warning Service device with the monitored data of each gas concentration sensor in step a, when Sensor monitoring to gas density abnormal, and gas concentration data in the digging laneway that monitors according to the first, the 3rd gas concentration sensor, when being judged as outstanding the generation, enter prediction steps, and will predict the outcome and be transferred to terminal by LAN, 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 less than 2% the time, predict that this outstanding gas emission is less than 400m 3, the outstanding duration surpasses 15s, and does not cause gas reflux, and outstanding gas all will flow the discharge mine with the wind;
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring greater than 2% less than 80%, 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 less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring predicts that greater than 80% 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 greater than 40%, utilize the forecast model in step b to predict this outstanding gas emission, outstanding duration and adverse current length.
Above-mentioned steps c also comprises:
The gas density that monitors in digging laneway when the first gas concentration sensor surpasses setting gas density limit, and the monitored data according to the first, the 3rd gas concentration sensor judges whether to occur to give prominence to, and Rule of judgment is specially:
1. the gas consistency peak that monitors of the one or three gas concentration sensor is all greater than 50%;
2. the gas density that monitors of the first, the 3rd gas concentration sensor rises to time of 50% all less than 30 seconds by 5%;
When 1., when 2. setting up simultaneously, be judged as outstanding the generation; Do not occur to give prominence to otherwise be judged as.
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.
The method of the outstanding accident of above-mentioned outstanding early period of origination quick recognition and prediction Gas scale also comprises step:
D occurs when abnormal when the data of the 5th, the 6th gas concentration sensor monitoring, and the personnel in reply return airway, work plane, air intake lane warn; If it is abnormal that the data of the 7th gas concentration sensor monitoring occur, the lower wind direction All Ranges of reply is warned.
With respect to prior art, the invention has the beneficial effects as follows:
1. traditional gas emission calculates all and carries out after accident finishes.The present invention can be in coal and the outstanding accident of gas burst 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 keep away to what accident was in time carried out rescue, personnel in the pit that control measure etc. are very helpful after calamity, calamity.
2. in the tunnel, variation ofgas density is the phenomenon that occurs at first after coal and Gas Outburst occur, the present invention not exclusively relies near the gas concentration sensor total data projecting point, the initial valid data that just obtain by gathering near the gas concentration sensor of projecting point, mainly utilize forecast model, carry out the outstanding fast prediction Gas scale that reaches of quick recognition.
Description of drawings
Below in conjunction with accompanying drawing and the specific embodiment, 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 and the gas concentration sensor in the present invention arranged schematic diagram.
Fig. 3 is Gas Outburst in the present invention and other gas concentration comparison diagram when abnormal.
Fig. 4 is gas density and the outstanding duration variation relation figure that the second and the 4th gas virtual-sensor in the present invention records.
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. tailentry, 13. coal-face, 14. work plane air intake lane, 15. main haulage roadway, 101. the first gas concentration sensor, 102. the second gas concentration sensor, 103. the 3rd gas concentration sensor, 104. the 4th gas concentration sensor, 105. the 5th gas concentration sensor, 106. the 6th gas concentration sensor, 107. the 7th gas concentration sensor.
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to Fig. 1, at first utilize central computer (personal workstation) to set up prognoses system software, and be placed in the Warning Service device; The real time data that the fire damp concentration sensor monitors is transferred to the Warning Service device by monitored data communication substation, and analyzes data in the Warning Service device, draws analysis result; Analysis result is shown in terminal by LAN, and reported to the police by alarm according to circumstances or make corresponding prompting.
referring to 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, lay gas concentration sensor 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: arrange the first gas concentration sensor apart from digging laneway and intersection location 10 meters of going up a hill in digging laneway, go up a hill in the middle distance of going up a hill and arrange respectively the second gas concentration sensor and the 3rd gas concentration sensor with digging laneway intersection location 10 meters, arrange the 4th gas concentration sensor at distance the second gas concentration sensor 80 meters, return airway at work plane, the air intake lane, arrange respectively the 5th in main haulage roadway, the 6th, the 7th gas concentration sensor.
The gas density that above-mentioned gas concentration sensor monitors is abnormal, according to reality, the situations such as outstanding, the fault of blowing out, ventilate is arranged generally.In these situations, the change curve of gas density is referring to Fig. 3.When Gas Outburst occurs when, variation ofgas density as curve 1. as shown in, be characterized in that the concentration rate of climb is fast, the highest gas concentration that reaches is larger, at the high concentration longer duration; Under other gas abnormal conditions, variation ofgas density as curve 2., 3. as shown in, be characterized in that gas density rises relatively slow, the time that continues when maximum concentration is short etc.
Accordingly, when the first gas concentration sensor monitors gas exceeding limit in digging laneway (as gas density〉1%), can judge whether fast according to the data of the first, the 3rd gas concentration sensor to occur outstanding, judgment criterion is specially: (1) first, the gas consistency peak that monitors of the 3rd gas concentration sensor is all greater than 50%; (2) first, the gas density that monitors of the 3rd gas concentration sensor rises to time of 50% all less than 30 seconds by 5%.When setting up simultaneously, can judge outstanding the generation when condition (1) and (2); Otherwise cannot not be judged as outstandingly, cause gas density abnormal reason may be for blowing out or coal petrography stress changes.Can give corresponding warning or prompting this moment 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, the two-dimentional physical model of tailentry, work plane air intake lane and main haulage roadway.The digging laneway of wherein simulating 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, respectively the second, the 4th gas concentration sensor and installation position thereof in corresponding above-mentioned actual conditions.Set up forecast model according to the analogue data of two virtual gas concentration sensors, the mathematic(al) representation of this forecast model is:
T = a 1 + b 1 t 1 + c 1 t 2 Q = a 2 + b 2 t 1 α + c 2 t 2 β L = a 3 + b 3 t 1 + c 3 t 2 - - - ( 1 )
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t 1Be gas density that the second and the 4th gas virtual-sensor the records time difference when rising to 40%, i.e. t 1Be that the 4th virtual gas concentration sensor gas density rises to moment of 40% and the second virtual gas concentration sensor gas density and rises to the poor of moment of 40%; t 2Be gas density that the 4th gas virtual-sensor the records time difference when rising to 80% by 5%, i.e. t 2Be the poor of the moment of the 4th virtual gas concentration sensor gas density when rising to moment of 80% and 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 that T is 30s, after simulation coal and Gas Outburst, and the gas decay of migrating in the network of tunnel.After simulation, obtaining this outstanding adverse current length is 112m, extracts the gas density data of above-mentioned two monitoring points, and curve is 4. and 5. in accompanying drawing 4.Time t when the gas density that obtains the 4th place, virtual gas concentration sensor position rises to 80% by 5% 2Be 3.8s, the time difference t the when gas density of the second, the 4th virtual gas concentration sensor rises to 40% 1Be 13.1s.Change gas emission Q and outstanding duration T and carry out respectively numerical simulation calculation, obtain the t under different operating modes 1And t 2Value; Match 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:
T=5.0+24.1t 1-9.5t2
Q = 3001.8 - 8990.1 t 1 - 0.9 + 13975.7 t 2 - 0.55 - - - ( 2 )
L=4.1-1.7T+0.043Q
The monitored data of above-mentioned gas concentration sensor group can be real-time transmitted to the Warning Service device, occur abnormal when some gas concentration sensor monitors gas density, and the gas density data in the digging laneway that monitors according to the one or three gas concentration sensor 3, when utilizing Rule of judgment (criterion) to be judged as outstanding the generation, can utilize in the gas density data of the second, the 4th gas concentration sensor record and/or Warning Service device forecast model that this outstanding scale is predicted; 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 less than 2%, predict that this outstanding gas emission is less than 400m 3, the outstanding duration surpasses 15s, and does not cause gas reflux, and outstanding gas all will flow the discharge mine with the wind.
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring greater than 2% less than 80%, 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 less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring predicts that greater than 80% 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 greater than 40%(or when the gas consistency peak of the 4th gas concentration sensor monitoring greater than 2% less than 40%, 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), the t that can utilize formula (2) and actual monitoring to arrive 1, t 2Value is predicted this outstanding gas emission, outstanding duration and adverse current length.
The present invention is as follows to other regional early warning, and when the data of the 5th, the 6th gas concentration sensor monitoring occur illustrate that the gas of gushing out has had influence on stope when abnormal, the personnel that tackle in return airway, work plane, air intake lane warn; If it is abnormal that the data of the 7th gas concentration sensor monitoring occur, the lower wind direction All Ranges of reply is warned.
The relevant technologies content of not addressing in aforesaid way is taked or is used for reference prior art and can realize.
Need to prove, those skilled in the art can also make such or such easy variation pattern under the instruction of this manual, such as equivalent way, or obvious mode of texturing.Above-mentioned variation pattern all should be within protection scope of the present invention.

Claims (4)

1. the method for the outstanding accident of an outstanding early period of origination quick recognition and prediction Gas scale, is characterized in that comprising the steps:
it is a kind of be used to sentencing the system of knowing outstanding accident and prediction Gas scale that a provides, 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, input the Warning Service device by optical cable, central computer provides the data of related-data handling module in the Warning Service device, and the Warning Service device connects terminal by LAN, and terminal connects alarm, above-mentioned gas concentration sensor group comprises: the first gas concentration sensor of arranging apart from itself and intersection location 10 meters of going up a hill in digging laneway, at middle the second gas concentration sensor and the 3rd gas concentration sensor of arranging respectively apart from itself and digging laneway intersection location 10 meters of going up a hill, the 4th gas concentration sensor of arranging at middle distance the second gas concentration sensor 80 meters of going up a hill, the 5th gas concentration sensor of arranging in the return airway of work plane, the 6th gas concentration sensor of arranging in the air intake lane of work plane, the 7th gas concentration sensor of arranging 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, the two-dimentional physical model of tailentry, work plane air intake lane and main haulage roadway; 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, be used for simulating respectively the second gas concentration sensor and the 4th gas concentration sensor of said system, set up forecast model according to the analogue data of two virtual gas concentration sensors, the mathematic(al) representation of this forecast model is:
T = a 1 + b 1 t 1 + c 1 t 2 Q = a 2 + b 2 t 1 α + c 2 t 2 β L = a 3 + b 3 t 1 + c 3 t 2
In formula, Q, T, L are respectively outstanding middle gas emission, outstanding duration and gas reflux length; t 1It is gas density that the second and the 4th virtual gas concentration sensor the records time difference when rising to 40%; t 2It is gas density that the 4th virtual gas concentration sensor the records time difference when rising to 80% by 5%; a i, b i, c i(i=1,2,3) and α and β are fitting constants;
C is real-time transmitted to the Warning Service device with the monitored data of each gas concentration sensor in step a, when Sensor monitoring to gas density abnormal, and gas concentration data in the digging laneway that monitors according to the first, the 3rd gas concentration sensor, when being judged as outstanding the generation, enter prediction steps, and will predict the outcome and be transferred to terminal by LAN, 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 less than 2% the time, predict that this outstanding gas emission is less than 400m 3, the outstanding duration surpasses 15s, and does not cause gas reflux, and outstanding gas all will flow the discharge mine with the wind;
(2) when the gas consistency peak of the 4th gas concentration sensor monitoring less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring greater than 2% less than 80%, 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 less than 2%, and the gas consistency peak of the second gas concentration sensor monitoring predicts that greater than 80% 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 greater than 40%, utilize the forecast model in step b 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 is given prominence to the method for accident and prediction Gas scale, and it is characterized in that: above-mentioned steps c also comprises:
The gas density that monitors in digging laneway when the first gas concentration sensor surpasses setting gas density limit, and the monitored data according to the first, the 3rd gas concentration sensor judges whether to occur to give prominence to, and Rule of judgment is specially:
1. the gas consistency peak that monitors of the first, the 3rd gas concentration sensor is all greater than 50%;
2. the gas density that monitors of the first, the 3rd gas concentration sensor rises to time of 50% all less than 30 seconds by 5%;
When 1., when 2. setting up simultaneously, be judged as outstanding the generation; Do not occur to give prominence to otherwise be judged as.
3. a kind of outstanding early period of origination quick recognition according to claim 1 is given 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, and 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 is given prominence to the method for accident and prediction Gas scale, characterized by further comprising step:
D occurs when abnormal when the data of the 5th, the 6th gas concentration sensor monitoring, and the personnel in reply return airway, work plane, air intake lane warn; If it is abnormal that the data of the 7th gas concentration sensor monitoring occur, the lower wind direction All Ranges of reply is warned.
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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

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