CN108760983A - It is classified the spontaneous combustion in coal face method for early warning of composite index system - Google Patents
It is classified the spontaneous combustion in coal face method for early warning of composite index system Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 117
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 108
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000007254 oxidation reaction Methods 0.000 claims description 21
- 238000002474 experimental method Methods 0.000 claims description 16
- 230000003203 everyday effect Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000004088 simulation Methods 0.000 claims description 7
- 241000208340 Araliaceae Species 0.000 claims description 6
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 6
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 235000008434 ginseng Nutrition 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 238000001764 infiltration Methods 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 147
- 230000003647 oxidation Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- -1 alkane alkene Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
- G01N33/0065—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means using more than one threshold
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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Abstract
The present invention provides a kind of spontaneous combustion in coal face method for early warning of classification composite index system, the CO critical value reference values at goaf oxidized zone, Air return corner and return are obtained not only through test data, CO critical value reference values are also used as by the practical content for measuring the CO at goaf oxidized zone, Air return corner and return simultaneously, therefore it is equivalent in conjunction with the actual measurement result in scene and test measurement as a result, the two is combined the critical value for determining goaf oxidized zone spontaneous fire CO, the critical value of Air return corner spontaneous fire CO.Later, it whether there is C in further combined with goaf2H4And C2H2Gas obtains warning level.Scheme provided by the invention can be by obtaining CO critical values after situ measurements and test result comprehensive consideration, and classifying rationally and forecast are carried out at by warning level in conjunction with gas with various, it accurately provides theoretical for spontaneous combustion in coal face early warning and applies foundation, method effectively reliable.
Description
Technical field
The present invention relates to the method for coal mine spontaneous fire early warning, more particularly to a kind of coal-getter of classification composite index system
Make face spontaneous fire method for early warning.
Background technology
Spontaneous combustion of coal is coal-mine fire one of the main reasons.Coal-mine fire not only causes serious coal resources wave
Take, also threaten the personal safety of underground operators, spontaneous combustion of coal prediction is exactly according to spontaneous combustion of coal mistake
The sign and observed result occurred in journey judges spontaneous combustion, prediction and deduction spontaneous combustion development trend, effective anti-to take in time
Fire suppression measures avoid causing resource, equipment even human loss, ensure safety in production.Coal spontaneous combustion forecasting technique predominantly indicates
Eudiometry, this technology, which refers to the loose coal and the oxygen catalytic oxidation accumulation of heat in air lost after exploitation, leads to media temperature liter
Height is identified spontaneous combustion of coal state and in advance according to characteristic parameters such as gas, the temperature changes generated in Coal Self-ignition Process
The method of report.
Symbolic gas analytic approach refers to by Analysis for CO, C2H4、C2H2, the coal spontaneous combustions heating and oxidation such as alkane alkene ratio and alkane ratio
As judging that ignition state refers to calibration method, these index gas gas in aoxidizing temperature-rise period produces the gas generated in the process
There are certain mathematical laws with own temperature for ratio between raw concentration, speed and specific gas.In mine practical application
In the process, spontaneous combustion of coal process is judged by the concentration of bound polyamine or manual sampling one or more symbolic gas, it can
It is predicted with the ratio changing rule between the gaining rate variation characteristic or certain gas components using certain several gas component.
《Safety regulations in coal mine》(2016 editions) regulations：When exploitation is easy spontaneous combustion and spontaneous progress, it is necessary to carry out spontaneous combustion
Spontaneous combustion monitoring system is established in monitoring, is determined that spontaneous combustion of coal seam is under fire and is identified gas and critical value, it is pre- to perfect spontaneous combustion
Survey forecast and management system.Spontaneous combustion symbolic gas critical value should as the case may be by experimental study, on-the-spot test and
Statistical analysis determination, and《Safety regulations in coal mine》It is duty that distinguished and admirable middle CO concentration limits as defined in 135th article, which are no more than 0.0024%,
Industry health indicator is not spontaneous combustion critical value.At this stage, spontaneous combustion CO symbolic gas critical values can be measured without one kind
Method, can not be forecast for underground spontaneous fire situation, be unfavorable for mine highly effective and safe production.
Invention content
The technical problem to be solved by the present invention is to carry out early warning to the spontaneous combustion of coal of coal working face in the prior art
Accuracy is low, and then provides a kind of side for carrying out early warning to spontaneous combustion using classification composite index system suitable for coal work
Method.
In order to solve the above technical problems, the present invention provides a kind of spontaneous combustion in coal face of classification composite index system
Method for early warning includes the following steps：
Field data obtaining step：In the gas sample for measuring acquisition goaf oxidized zone in the period as the first gas sample,
Goaf the first reference value of oxidized zone critical value a is obtained according to the content of CO in first gas sample；It is acquired measuring in the period
The gas sample of Air return corner obtains Air return corner critical value as the second gas sample, according to the content of CO in second gas sample
One reference value b；The gas sample in the period at acquisition return is being measured as third gas sample, according to CO in the third gas sample
Content obtain the critical value c of return spontaneous fire CO；
Test data obtaining step：It obtains CO of the coal body when temperature is T at coal working face and generates rate；According to adopting
Coal amount, the space for accommodating gas and the CO of dead zone oxidized zone generate rate and obtain goaf oxidized zone critical value second
Reference value A, and obtained according to goaf oxidized zone critical value the first reference value a and goaf the second reference value A of oxidized zone critical value
To the critical value A of goaf oxidized zone spontaneous fire CO0；According to Air return corner coal amount, the space for accommodating gas and described
CO generations rate obtains Air return corner critical value ginseng two and examines value B, and according to Air return corner critical value the first reference value b and return air
Corner critical value ginseng two examines value B and obtains the critical value B of Air return corner spontaneous fire CO0；
Warning level determines step：According to facing as goaf oxidized zone CO concentration and goaf oxidized zone spontaneous fire CO
Dividing value A0Relationship, C at the oxidized zone of goaf2H4And C2H2Content, Air return corner CO concentration are with Air return corner spontaneous fire CO's
Critical value B0Relationship, C at Air return corner2H4And C2H2The critical value c of content, return CO concentration and return spontaneous fire CO
Relationship and return at C2H4And C2H2Content determines working face spontaneous fire warning level and sends out and the early warning grade
Not corresponding warning information.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the experiment
In data acquisition step：
Goaf the second reference value A of oxidized zone critical value is obtained according to following formula：
The second reference value of Air return corner critical value B is obtained according to following formula：
In above formula,For infiltration coefficient in goaf；k1For goaf oxidized zone oxidization of remained coal degree coefficient；Z1For
The width of goaf return side oxidized zone；Y1Bandwidth is aoxidized for inlet side；Y2For inlet side heat dissipation bandwidth；k2For goaf
Heat-radiation belt oxidization of remained coal degree coefficient；For working face extraction rate；δCO(T) it is that CO of the coal body when temperature is T generates rate；L
For face length；H is working seam thickness；QLeakageFor working face inleakage.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the experiment
In data acquisition step：
The critical value A of goaf oxidized zone spontaneous fire CO0=MAX (a, A)；The critical value of Air return corner spontaneous fire CO
B0=MAX (b, B).
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the early warning
Warning level described in level determining step point includes four ranks, wherein：
I grade of warning level：Goaf oxidized zone CO concentration<A0, do not occur gas C at the oxidized zone of goaf2H4And C2H2；And
And Air return corner CO concentration<B0, do not occur gas C at Air return corner2H4And C2H2；Also, return CO concentration<C, return
Place does not occur gas C2H4And C2H2；
II grade of warning level：Goaf oxidized zone CO concentration>A0, do not occur gas C at the oxidized zone of goaf2H4And C2H2；
Or, Air return corner CO concentration>B0, do not occur gas C at Air return corner2H4And C2H2；Or, return CO concentration>C, at return
Do not occur gas C2H4And C2H2；
III grade of warning level：Goaf oxidized zone CO concentration>A0, there is gas C at the oxidized zone of goaf2H4, do not occur gas
Body C2H2；Or Air return corner CO concentration>B0, there is gas C at Air return corner2H4, do not occur gas C2H2；Or return CO concentration
>There is gas C at return in c2H4, do not occur gas C2H2；
IV grade of warning level：Goaf oxidized zone CO concentration>A0, there is gas C at the oxidized zone of goaf2H4And C2H2；Or,
Air return corner CO concentration>B0, there is gas C at Air return corner2H4And C2H2；Or, return CO concentration>There is gas at return in c
Body C2H4And C2H2。
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the early warning
Further include in level determining step：Transfer pre-stored prediction scheme information corresponding with the warning level, the prediction scheme letter
The operation that has the communication mode of related personnel and related personnel and should execute is recorded in breath；According to the communication mode by institute
The operation stated warning level and should executed is sent to related personnel.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, warning level
It determines in step, CO of the coal body when temperature is T generates rate and obtain in the following manner：It is acquired on coal working face coal wall
Test coal sample；The experiment coal sample is put into coal spontaneous ignition simulation test device, is determined for air mass flow, heating rate,
Gas sample acquisition interval time；The CO of coal body that the coal spontaneous ignition simulation test device measures when temperature is T is obtained to generate
Rate.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the experiment
The coal sample size of coal sample<0.15mm, weight 1g；For air mass flow 100ml/min；
It is that heating rate is 0.5 DEG C/min in 25~80 DEG C of sections in temperature, is to heat up in 80~200 DEG C of sections in temperature
Rate is 1.0 DEG C/min, is that heating rate is 2.0 DEG C/min in 200~300 DEG C of sections in temperature；When gas sample acquisition interval
Between<20min/ times.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, field data
In obtaining step：
In the gas sample for measuring acquisition goaf oxidized zone in the period as the first gas sample, according in first gas sample
The content of CO obtains goaf the first reference value of oxidized zone critical value a：In every day within the measurement period：In work
Make face air return way to move towards to bury from goaf along tunnel to take the first gas sample in beam tube；First gas sample is measured using gas chromatograph
The content of middle CO；By the average value of the content of CO in the first gas sample for measuring every day as goaf oxidized zone critical value first
Reference value a；
In the gas sample for measuring acquisition Air return corner in the period as the second gas sample, according to CO in second gas sample
Content obtains the first reference value of Air return corner critical value b：In every day within the measurement period：At Air return corner
The second gas sample is acquired, the content of CO in the second gas sample is measured using gas chromatograph；By CO in the second gas sample for measuring every day
Content average value as the first reference value of Air return corner critical value b；
The gas sample in the period at acquisition return is being measured as third gas sample, according to CO in the third gas sample
The critical value c that content obtains return spontaneous fire CO includes：Third gas sample is acquired at return, is surveyed using gas chromatograph
Take the content of CO in third gas sample；It is sent out naturally as return by the average value of the content of CO in the third gas sample that measures every day
The critical value c of fiery CO.
Optionally, in the spontaneous combustion in coal face method for early warning of above-mentioned classification composite index system, the measurement
Period >=30 day.
Above technical scheme provided by the invention at least has the advantages that compared with prior art：
The spontaneous combustion in coal face method for early warning of classification composite index system provided by the invention, wherein not only through
Test data obtains the CO critical value reference values at goaf oxidized zone, Air return corner and return, while also passing through practical survey
The content of the CO at goaf oxidized zone, Air return corner and return is measured as CO critical value reference values, therefore is equivalent to combination
The actual measurement result in scene and test measurement as a result, the two, which is combined, determines goaf oxidized zone spontaneous fire CO's
The critical value of critical value, Air return corner spontaneous fire CO.Later, it whether there is C in further combined with goaf2H4And C2H2
Gas obtains warning level.Scheme provided by the invention can be by obtaining after situ measurements and test result comprehensive consideration
CO critical values, and gas with various is combined to carry out classifying rationally and forecast at by warning level, it is accurately coal working face
Spontaneous fire early warning provides theoretical and applies foundation, method effectively reliable.
Description of the drawings
Fig. 1 is the spontaneous combustion in coal face method for early warning that composite index system is classified described in one embodiment of the invention
Flow chart.
Specific implementation mode
Below in conjunction with attached drawing in the present embodiment, example description is carried out to the technical solution in the present invention.The present invention's
In description, it should be noted that term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside" etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the letter of the description present invention
Change description, do not indicate or imply the indicated device or component must have a particular orientation, with specific azimuth configuration and
Operation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " third " are only used for description mesh
, it is not understood to indicate or imply relative importance.Wherein, term " first position " is two different with " second position "
Position.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
The connection of two component internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The present embodiment provides a kind of spontaneous combustion in coal face method for early warning of classification composite index system, such as Fig. 1 institutes
Show, includes the following steps：
S1：Field data obtaining step：The gas sample of acquisition goaf oxidized zone in the period is being measured as the first gas
Sample obtains goaf the first reference value of oxidized zone critical value a according to the content of CO in first gas sample；It is adopted measuring in the period
Collect the gas sample of Air return corner as the second gas sample, Air return corner critical value is obtained according to the content of CO in second gas sample
First reference value b；The gas sample in the period at acquisition return is being measured as third gas sample, according in the third gas sample
The content of CO obtains the critical value c of return spontaneous fire CO；More than, the measurement period longer result is more accurate, preferably greatly
In or wait 30 days or more, such as the measurement period can select one month, 45 days etc..By a longer period
CO content situations at interior detection goaf oxidized zone, Air return corner and return, obtain CO content value models under normal circumstances
Enclose, later as a reference value of the CO contents in these three places, and these three places in coal working face when most
Representative, therefore can be according to the gas marker testing result at these three points as early warning criterion.Specifically
Ground can obtain a, b, c in the following manner.
In every day within the measurement period：In working face air return way beam tube is buried from goaf along tunnel trend
In take the first gas sample；The content of CO in the first gas sample is measured using gas chromatograph；By CO in the first gas sample for measuring every day
Content average value as goaf the first reference value of oxidized zone critical value a；In every day within the measurement period：?
The second gas sample is acquired at Air return corner, and the content of CO in the second gas sample is measured using gas chromatograph；By measure every day
The average value of the content of CO is as the first reference value of Air return corner critical value b in two gas samples；Third gas sample is acquired at return,
The content of CO in third gas sample is measured using gas chromatograph；By the average value of the content of CO in the third gas sample that measures every day
Critical value c as return spontaneous fire CO.
S2：Test data obtaining step：It obtains CO of the coal body when temperature is T at coal working face and generates rate；Root
Rate, which is generated, according to the coal amount of goaf oxidized zone, the space for accommodating gas and the CO obtains goaf oxidized zone critical value
Second reference value A, according to goaf oxidized zone critical value the first reference value a and goaf the second reference value A of oxidized zone critical value
Obtain the critical value A of goaf oxidized zone spontaneous fire CO0, in specific implementation, a kind of calculation can be selected to calculate
It is referred to for goaf oxidized zone critical value first to the critical value of goaf oxidized zone spontaneous fire CO, such as by weighting algorithm
Weighted value is arranged in value a and goaf the second reference value A of oxidized zone critical value, calculates the weighted average of the two, this implementation later
The critical value A of goaf oxidized zone spontaneous fire CO can be selected in example0=MAX (a, A)；According to Air return corner coal amount, it is used for
It accommodates the space of gas and CO generations rate obtains Air return corner critical value ginseng two and examines value B, and faced according to Air return corner
Dividing value the first reference value b and Air return corner critical value ginseng two examine value B and obtain the critical value B of Air return corner spontaneous fire CO0,
When specific implementation, it can select a kind of calculation that the critical value of Air return corner spontaneous fire CO is calculated, such as by adding
It is Air return corner oxidized zone critical value the first reference value b and the second reference value of Air return corner critical value B setting weighted values to weigh algorithm,
The weighted average of the two is calculated later, and the critical value B of Air return corner spontaneous fire CO can be selected in the present embodiment0=MAX
(b, B)；Namely when choosing critical value, selects in-site measurement reference value and test in reference value larger data as facing
Dividing value finds the CO content value phases that the CO content values of in-site measurement are obtained with experiment because after being compared by a large number of experiments
Difference is not very big, it is contemplated that does not bring very big interference to work on the spot environment, selects higher value between the two, avoids live warp
Often there is alarm, in addition select higher value in two values and security risk is not present.
More than, CO of the coal body when temperature is T generates rate and obtains in the following manner：
The acquisition experiment coal sample on coal working face coal wall；The experiment coal sample is put into coal spontaneous ignition simulation test dress
In setting, determine for air mass flow, heating rate, gas sample acquisition interval time；Obtain the coal spontaneous ignition simulation test device
CO of the coal body measured when temperature is T generates rate.The above experiment process, has relevant criterion in coal mining technology field
It can inquire, when specific implementation, can carry out in the following way：The coal sample size of the experiment coal sample<0.15mm, weight are
1g；For air mass flow 100ml/min；Be that heating rate is 0.5 DEG C/min in 25~80 DEG C of sections in temperature, temperature be 80~
Heating rate is 1.0 DEG C/min in 200 DEG C of sections, is that heating rate is 2.0 DEG C/min in 200~300 DEG C of sections in temperature；
Gas sample acquisition interval time<20min/ times.And existing production in the prior art may be used in coal spontaneous ignition simulation test device
Product can be realized.
Further, in this embodiment obtaining goaf the second reference value A of oxidized zone critical value according to following formula：
The second reference value of Air return corner critical value B is obtained according to following formula：
In above formula,For infiltration coefficient in goaf；k1For goaf oxidized zone oxidization of remained coal degree coefficient；Z1For
The width of goaf return side oxidized zone；Y1Bandwidth is aoxidized for inlet side；Y2For inlet side heat dissipation bandwidth；k2For goaf
Heat-radiation belt oxidization of remained coal degree coefficient；For working face extraction rate；δCO(T) it is that CO of the coal body when temperature is T generates rate；L
For face length；H is working seam thickness；QLeakageFor working face inleakage.
Actual geographic environmental parameter by way of in-site measurement or can consult open source literature in the above goaf
Mode obtains.
S3：Warning level determines step：According to when goaf oxidized zone CO concentration and goaf oxidized zone spontaneous fire CO
Critical value A0Relationship, C at the oxidized zone of goaf2H4And C2H2Content, Air return corner CO concentration and Air return corner spontaneous fire
The critical value B of CO0Relationship, C at Air return corner2H4And C2H2Content, return CO concentration are faced with return spontaneous fire CO's
C at the relationship and return of dividing value c2H4And C2H2Content determine working face spontaneous fire warning level and send out with it is described pre-
The corresponding warning information of police's rank.
Specifically, the warning level point includes four ranks, wherein：
I grade of warning level, this rank are security level, need to meet：Goaf oxidized zone CO concentration<A0, goaf oxidation
Do not occur gas C at band2H4And C2H2；Also, Air return corner CO concentration<B0, do not occur gas C at Air return corner2H4And C2H2；
Also, return CO concentration<C does not occur gas C at return2H4And C2H2；
II grade of warning level, this rank correspond to the state of oxidation, need to meet：Goaf oxidized zone CO concentration>A0, goaf oxygen
Change at band and does not occur gas C2H4And C2H2；Or, Air return corner CO concentration>B0, do not occur gas C at Air return corner2H4And C2H2；
Or, return CO concentration>C does not occur gas C at return2H4And C2H2；
III grade of warning level, this rank correspond to accelerated oxidation state, need to meet：Goaf oxidized zone CO concentration>A0, mined out
Occurs gas C at area's oxidized zone2H4, do not occur gas C2H2；Or Air return corner CO concentration>B0, there is gas at Air return corner
C2H4, do not occur gas C2H2；Or return CO concentration>There is gas C at return in c2H4, do not occur gas C2H2；
IV grade of warning level, this rank correspond to open fire state, need to meet：Goaf oxidized zone CO concentration>A0, goaf oxygen
Change at band and gas C occurs2H4And C2H2；Or, Air return corner CO concentration>B0, there is gas C at Air return corner2H4And C2H2；Or, returning
Distinguished and admirable CO concentration>There is gas C at return in c2H4And C2H2。
Goaf oxidized zone is provided by above scheme, Air return corner spontaneous fire symbolic gas CO reference values calculate public affairs
Formula, and goaf oxidized zone, Air return corner, spontaneous fire symbolic gas CO critical values at return is determined, divide IV grade accordingly
Coal working face safe condition, the state of oxidation, accelerated oxidation state, open fire state is determined, carries out early warning for position, and adopt
Corresponding fire-fighting measure is taken, provide theoretical for spontaneous combustion in coal face early warning and applies foundation, method effectively reliable.
Preferably, the warning level described in above scheme, which determines in step, further includes：
Pre-stored prediction scheme information corresponding with the warning level is transferred, record has correlation in the prediction scheme information
The communication mode of personnel and related personnel and the operation that should be executed；It by the warning level and is answered according to the communication mode
The operation of execution is sent to related personnel.
The prediction scheme information can be with example shown in reference table 1.Referring to table 1, spontaneous combustion in coal face classification is multiple
It closes pre-alarming system personnel's emergency response and suggests table, implement response at different level measure.
1 spontaneous combustion in coal face of table is classified compound pre-alarming system personnel emergency response and suggests table
Wherein, can be associated with it in the contact method of each staff in individual response part, contact method can be with
For phone, mailbox etc..Once it is determined that after warning level, directly corresponding measure in warning level and table can be sent to pair
It answers at the contact method of staff.Further, it can also include after this step the operational feedback for receiving staff
Information, to determine result or effect after staff's execution corresponding measure, if security risk can be avoided the occurrence of, avoided
Warning level is to more advanced variation.
A specific realization process for illustrating the above process is provided below：
Samples of coal pulled and experiment coal sample is produced on coal working face coal wall, experiment coal sample, which is put into coal spontaneous, is under fire test
In device, coal sample size is tested<0.15mm, weight 1g determine that 25~80 DEG C of heating rate is for air mass flow 100ml/min
0.5 DEG C/min, 80~200 DEG C are 1.0 DEG C/min, and 200~300 DEG C are 2.0 DEG C/min, remain after 300 DEG C 2.0 DEG C/
Min, gas sample acquisition interval time 15min/ times, experiment obtain CO of the coal body when temperature is T and generate rate δCO(T), unit is
mol.cm-3.s-1。
Moving towards to bury beam tube to goaf along tunnel in working face air return way takes gas sample gas chromatograph to measure for 40 days
The number of days average value of spontaneous fire symbolic gas CO is goaf oxidized zone critical value the first reference value a=240ppm, in return air
It is Air return corner critical value that corner, which takes gas sample to measure the number of days average value of spontaneous fire symbolic gas CO with gas chromatograph for 40 days,
First reference value b=57.6ppm takes gas sample to measure spontaneous fire symbolic gas CO's with gas chromatograph in 40 days at return
Number of days average value is the return critical value c=18ppm of spontaneous fire symbolic gas CO, according to CO concentration in the oxidized zone of goaf
Calculation formula:
Calculate the second reference value A of critical value=224ppm of goaf oxidized zone spontaneous fire oxidation symbolic gas CO, root
According to Air return corner CO concentration calculation formula:
Calculate the second reference value of critical value B=56.6ppm of Air return corner spontaneous fire oxidation symbolic gas CO.
In above formula：For infiltration coefficient in goaf, comprehensive coal face takes 0.5~0.7 under normal circumstances, in the present embodiment
Take median 0.6；k1For goaf oxidized zone oxidization of remained coal degree coefficient, 0.4 is taken, being less than 1, (comprehensive coal face takes under normal circumstances
0.2~0.4)；Z1For the width of goaf return side oxidized zone, unit m is actually measured as 15m；Y1For inlet side oxidized zone
Width, unit m, is actually measured as 70m；Y2For inlet side heat dissipation bandwidth, unit m is actually measured as 80m；k2It is mined out
Area's heat-radiation belt oxidization of remained coal degree coefficient, take 0.9 (under the conditions of normal leak out, 0.8~1 is generally taken, if air leak rate of air curtain is less than 1%,
It then takes less than 0.5)；Z2For the width of goaf heat-radiation belt, unit m；Actually it is measured as 80m；For working face extraction rate, take
75/%；δCO(T) it is that CO of the coal body when temperature is T generates rate (testing determination according to coal spontaneous combustion) mol.cm-3.s-1, examination
It tests to obtain 0.17mol.cm-3.s-1；L is face length, and unit m is practical not to be measured as 240m；H is working seam thickness,
Unit is m, is actually measured as 6.1m；QLeakageFor working face inleakage m3/ min, is actually measured as 110m3/ min, goaf oxidized zone
The critical value A of spontaneous fire symbolic gas CO0=MAX (a, A)=MAX (240,224)=240ppm, Air return corner spontaneous fire
The critical value B of symbolic gas CO0=MAX (b, B)=MAX (57.6,56.6)=57.6ppm.
According to the above result of calculation, coal work face goaf oxidized zone, Air return corner, when monitoring at return, by with
Lower classification processing：
When goaf oxidized zone CO concentration<240ppm, gas C at this2H4Do not occur, gas C2H2Do not occur, and return air corner
Angle CO concentration<57.6ppm, gas C at this2H4Do not occur, gas C2H2Do not occur, and return CO concentration<18ppm, gas at this
Body C2H4Do not occur, gas C2H2Do not occur, is safe condition, is defined as I grade；
When goaf oxidized zone CO concentration>240ppm, gas C at this2H4Do not occur, gas C2H2Do not occur or return air corner
Angle CO concentration>57.6ppm, gas C at this2H4Do not occur, gas C2H2Do not occur or return CO concentration>18ppm, gas at this
Body C2H4Do not occur, gas C2H2Do not occur, is the state of oxidation, is defined as II grade；
When goaf oxidized zone CO concentration>240ppm, gas C at this2H4Occur, gas C2H2Do not occur or Air return corner
CO concentration>57.6ppm, gas C at this2H4Occur, gas C2H2Do not occur or return CO concentration>18ppm, gas at this
C2H4Occur, gas C2H2Do not occur, is accelerated oxidation state, is defined as III grade；
When goaf oxidized zone CO concentration>240ppm, gas C at this2H4Occur, gas C2H2Appearance or Air return corner CO
Concentration>57.6ppm, gas C at this2H4Occur, gas C2H2Appearance or return CO concentration>18ppm, gas C at this2H4Go out
It is existing, gas C2H2Occur, is open fire state, is defined as IV grade.
Daily coal work face goaf oxidized zone monitors CO concentration=230ppm, no C2H4、C2H2Gas occurs, and
Air return corner CO concentration=56.6ppm, no C2H4、C2H2Gas occurs, and return CO concentration=17.2ppm, no C2H4、C2H2
Gas occurs.It is judged as I grade, it is in a safe condition, it is proposed that referring to I grades of responses processing in table 1.
Wherein：According to I grade-IV grade of classification status, i.e. safe condition, the state of oxidation, accelerated oxidation state, open fire state
It determines that position carries out early warning, and takes corresponding fire-fighting measure.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of spontaneous combustion in coal face method for early warning of classification composite index system, which is characterized in that including walking as follows
Suddenly：
Field data obtaining step：In the gas sample for measuring acquisition goaf oxidized zone in the period as the first gas sample, according to
The content of CO obtains goaf the first reference value of oxidized zone critical value a in first gas sample；Return air is acquired measuring in the period
The gas sample of corner obtains Air return corner critical value first as the second gas sample, according to the content of CO in second gas sample joins
Examine value b；The gas sample in the period at acquisition return is being measured as third gas sample, is being contained according to CO in the third gas sample
Measure the critical value c of return spontaneous fire CO；
Test data obtaining step：It obtains CO of the coal body when temperature is T at coal working face and generates rate；According to goaf
Coal amount, the space for accommodating gas and the CO of oxidized zone generate rate and obtain the reference of goaf oxidized zone critical value second
Value A, and adopted according to goaf oxidized zone critical value the first reference value a and goaf the second reference value A of oxidized zone critical value
The critical value A of dead zone oxidized zone spontaneous fire CO0；It is produced according to Air return corner coal amount, the space for accommodating gas and the CO
Raw rate obtains Air return corner critical value ginseng two and examines value B, and according to Air return corner critical value the first reference value b and Air return corner
Critical value ginseng two examines value B and obtains the critical value B of Air return corner spontaneous fire CO0；
Warning level determines step：According to the critical value when goaf oxidized zone CO concentration and goaf oxidized zone spontaneous fire CO
A0Relationship, C at the oxidized zone of goaf2H4And C2H2Content, Air return corner CO concentration are critical with Air return corner spontaneous fire CO's
Value B0Relationship, C at Air return corner2H4And C2H2The pass of content, return CO concentration and the critical value c of return spontaneous fire CO
C at system and return2H4And C2H2Content determines working face spontaneous fire warning level and sends out and the warning level pair
The warning information answered.
2. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 1, feature
It is, in the test data obtaining step：
Goaf the second reference value A of oxidized zone critical value is obtained according to following formula：
The second reference value of Air return corner critical value B is obtained according to following formula：
In above formula,For infiltration coefficient in goaf；k1For goaf oxidized zone oxidization of remained coal degree coefficient；Z1For goaf
The width of return side oxidized zone；Y1Bandwidth is aoxidized for inlet side；Y2For inlet side heat dissipation bandwidth；k2For goaf heat-radiation belt
Oxidization of remained coal degree coefficient；For working face extraction rate；δCO(T) it is that CO of the coal body when temperature is T generates rate；L is work
Face length；H is working seam thickness；QLeakageFor working face inleakage.
3. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 1, feature
It is, in the test data obtaining step：
The critical value A of goaf oxidized zone spontaneous fire CO0=MAX (a, A)；The critical value B of Air return corner spontaneous fire CO0=
MAX (b, B).
4. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 1, feature
It is, the warning level determines that warning level described in step point includes four ranks, wherein：
I grade of warning level：Goaf oxidized zone CO concentration<A0, do not occur gas C at the oxidized zone of goaf2H4And C2H2；Also,
Air return corner CO concentration<B0, do not occur gas C at Air return corner2H4And C2H2；Also, return CO concentration<C, at return not
There is gas C2H4And C2H2；
II grade of warning level：Goaf oxidized zone CO concentration>A0, do not occur gas C at the oxidized zone of goaf2H4And C2H2；Or, returning
Wind corner CO concentration>B0, do not occur gas C at Air return corner2H4And C2H2；Or, return CO concentration>C does not occur at return
Gas C2H4And C2H2；
III grade of warning level：Goaf oxidized zone CO concentration>A0, there is gas C at the oxidized zone of goaf2H4, do not occur gas
C2H2；Or Air return corner CO concentration>B0, there is gas C at Air return corner2H4, do not occur gas C2H2；Or return CO concentration>
There is gas C at return in c2H4, do not occur gas C2H2；
IV grade of warning level：Goaf oxidized zone CO concentration>A0, there is gas C at the oxidized zone of goaf2H4And C2H2；Or, return air
Corner CO concentration>B0, there is gas C at Air return corner2H4And C2H2；Or, return CO concentration>There is gas at return in c
C2H4And C2H2。
5. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 4, feature
It is, the warning level, which determines in step, further includes：
Pre-stored prediction scheme information corresponding with the warning level is transferred, record has relevant people in the prediction scheme information
The communication mode and the operation that should execute of member and related personnel；It by the warning level and should be held according to the communication mode
Capable operation is sent to related personnel.
6. being classified the pre- police of spontaneous combustion in coal face of composite index system according to claim 1-5 any one of them
Method, which is characterized in that warning level determines in step that CO of the coal body when temperature is T generates rate and obtain in the following manner：
The acquisition experiment coal sample on coal working face coal wall；
The experiment coal sample is put into coal spontaneous ignition simulation test device, determines that, for air mass flow, heating rate, gas sample is adopted
Collect interval time；
It obtains the CO of coal body that the coal spontaneous ignition simulation test device measures when temperature is T and generates rate.
7. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 6, feature
It is：
The coal sample size of the experiment coal sample<0.15mm, weight 1g；
For air mass flow 100ml/min；
It is that heating rate is 0.5 DEG C/min in 25~80 DEG C of sections in temperature, is heating rate in 80~200 DEG C of sections in temperature
It is that heating rate is 2.0 DEG C/min in 200~300 DEG C of sections in temperature for 1.0 DEG C/min；
Gas sample acquisition interval time<20min/ times.
8. being classified the pre- police of spontaneous combustion in coal face of composite index system according to claim 1-5 any one of them
Method, which is characterized in that in field data obtaining step：
In the gas sample for measuring acquisition goaf oxidized zone in the period as the first gas sample, according to CO in first gas sample
Content obtains goaf the first reference value of oxidized zone critical value a：In every day within the measurement period：In working face
Air return way is buried from goaf along tunnel trend and takes the first gas sample in beam tube；CO in first gas sample is measured using gas chromatograph
Content；It is referred to as goaf oxidized zone critical value first by the average value of the content of CO in the first gas sample for measuring every day
Value a；
In the gas sample for measuring acquisition Air return corner in the period as the second gas sample, according to the content of CO in second gas sample
Obtaining the first reference value of Air return corner critical value b includes：In every day within the measurement period：It is acquired at Air return corner
Second gas sample measures the content of CO in the second gas sample using gas chromatograph；Contained by CO in the second gas sample for measuring every day
The average value of amount is as the first reference value of Air return corner critical value b；
The gas sample in the period at acquisition return is being measured as third gas sample, according to the content of CO in the third gas sample
The critical value c for obtaining return spontaneous fire CO includes：Third gas sample is acquired at return, and the is measured using gas chromatograph
The content of CO in three gas samples；By the average value of the content of CO in the third gas sample that measures every day as return spontaneous fire CO
Critical value c.
9. the spontaneous combustion in coal face method for early warning of classification composite index system according to claim 8, feature
It is, measurement period >=30 day.
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