CN105673078A - Index gas based goaf coal spontaneous combustion hazard level judgment and prewarning method - Google Patents
Index gas based goaf coal spontaneous combustion hazard level judgment and prewarning method Download PDFInfo
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- CN105673078A CN105673078A CN201610065635.9A CN201610065635A CN105673078A CN 105673078 A CN105673078 A CN 105673078A CN 201610065635 A CN201610065635 A CN 201610065635A CN 105673078 A CN105673078 A CN 105673078A
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- 239000003245 coal Substances 0.000 title claims abstract description 162
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 151
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012544 monitoring process Methods 0.000 claims abstract description 178
- 239000000523 sample Substances 0.000 claims abstract description 29
- 238000012806 monitoring device Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 17
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- 239000003086 colorant Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 163
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000009429 distress Effects 0.000 description 2
- 238000004079 fireproofing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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Abstract
The invention discloses an index gas based goaf coal spontaneous combustion hazard level judgment and prewarning method. The method comprises the steps of 1, arranging a coalmine goaf coal spontaneous combustion index gas monitoring device; 2, acquiring and transmitting coalmine goaf coal spontaneous combustion index gas concentrations; and 3, performing analysis processing on each gas concentration of a coalmine goaf as well as the CO concentration, the C2H4 concentration and a temperature signal detected by a temperature sensing probe by a ground monitoring computer, and performing coal fire hazard risk prewarning. The method is simple in step, novel and reasonable in design, convenient to realize, high in automation degree, high in reliability, comprehensive and accurate in goaf coal spontaneous combustion degree prediction, wide in application range, high in practicality, good in use effect and convenient to popularize and use.
Description
Technical field
The invention belongs to technical field of mine safety, be specifically related to a kind of goaf coal spontaneous combustion degree of danger based on index gas and differentiate and method for early warning.
Background technology
Coal spontaneous combustion fire is one of five big disasters of serious threat China's coal-mine safety in production, China's State owned coal mine have 56% there is coal spontaneous ignition hazard, and goaf coal spontaneous combustion accounts for the overwhelming majority of mine coal freely burning fire, spontaneous combustion caving method is adopted owing to the goaf top plate of China's coal-mine manages, goaf after exploitation can be caving by upper strata rock and cover, the state making spontaneous combustion in goaf can not directly simply be detected, and therefore the judgement of the spontaneous combustion degree of Residual coal in goaf is still that a difficult problem for a puzzlement peaceful product of China's coal-mine. but traditional goaf monitoring and coal spontaneous combustion judge that deciding degree method mainly has, goaf Tube Bundle Monitoring System, it can only the auto-ignition of Residual coal in goaf of the only small segment limit of monitoring face twice, simultaneously need to substantial amounts of personnel's maintenance work monitoring effect is not good, goaf wireless monitor its can the layout measuring point of scope, but wireless signal can only pass 5 to 10m in goaf, it adopts the mode of multi-hop to transmit information, owing to the complex environment in the goaf of mine makes, if the coal spontaneous combustion situation monitoring goaf accurately needs substantial amounts of layouting, and its high cost and reliability are not high. the index gas that the CO gas produced in current domestic and international commonly used Coal Self-ignition Process is predicted as spontaneous combustion of coal seam situation, the amount of the CO gas by producing in Coal Self-ignition Process judges the spontaneous combustion degree of coal, in gas collecting process, itself shortcoming of existing method is accurately complete can not to gather the gas produced in spontaneous combustion in goaf process, the degree judging goaf coal spontaneous combustion that therefore can only be general. and can not be accurately positioned and judge the coal spontaneous combustion state that goaf is concrete, this brings bigger difficulty to the prevention of the efficiently and accurately of goaf coal spontaneous combustion fire, prevents and treats labor intensive material resources in process at fire. owing to can not accurately position and judge that a part of spontaneous combustion of remaining coal danger of goaf is relatively big, and cause coal spontaneous combustion fire prevention effect in goaf not good.
Summary of the invention
The technical problem to be solved is in that for above-mentioned deficiency of the prior art, thering is provided a kind of goaf coal spontaneous combustion degree of danger based on index gas to differentiate and method for early warning, its method step is simple, novel in design reasonable, it is convenient to realize, automaticity is high, and reliability is high, to the prediction of goaf coal spontaneous combustion degree comprehensively accurately, applied widely, practical, result of use is good, it is simple to promote the use of.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that the method comprises the following steps:
The layout of step one, coal mine gob coal spontaneous combustion index gas monitoring device: arrange multiple for detecting CO gas concentration, C in coal mine gob2H4The gas concentration of gas concentration and temperature and temperature sensing probe, it is monitoring point that definition is provided with the position of gas concentration and temperature sensing probe, and be connected to be integrated with CO gas sensor, C in downhole monitoring main frame, described gas concentration and temperature sensing are popped one's head in by multiple gas concentrations and temperature sensing probe2H4Gas sensor and temperature sensor, described downhole monitoring main frame by telecommunication optical fiber access industrial looped network and with ground monitoring compunication;
Step 2, the collection of coal mine gob coal spontaneous combustion index gas concentration and transmission: multiple gas concentrations and temperature sensing are popped one's head in respectively to the CO gas concentration at its position place, C2H4Gas concentration and the temperature cycle of carrying out be T be periodically detected and be transferred to downhole monitoring main frame, the signal that downhole monitoring main frame is received by telecommunication optical fiber and industry looped network be transferred to ground monitoring computer; Wherein, the value of T is 3～20 minutes;
Step 3, ground monitoring computer each gas concentration of coal mine gob and temperature sensing are popped one's head in detect CO gas concentration, C2H4Gas concentration and temperature signal are analyzed processing, and carry out coal fire calamity danger early warning, and detailed process is:
Step 301, with work surface be inclined to direction for X-axis, moving towards direction is Y-axis, with CO gas concentration, C2H4The height of gas concentration and temperature is Z axis, sets up rectangular coordinate system in space, draws coal mine gob CO gas concentration, C2H4Gas concentration and temperature field figure;
Step 302, judge whether coal mine gob occurs in that C2H4Gas, when occurring in that C2H4During gas, perform step 303, otherwise, perform step 304;
Step 303, will appear from C2H4The region of the monitoring point composition of gas is defined as spontaneous combustion in goaf deathtrap;
Step 304, in goaf except searching out C2H4In region outside gas zones, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 305, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 400ppm, by monitoring point place temperature the highest for temperature compared with 70 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 400ppm, or the highest monitoring point place temperature of temperature be more than or equal to 70 DEG C time, perform step 306; When the highest monitoring point place CO gas concentration of CO gas concentration is less than 400ppm, and the highest monitoring point place temperature of temperature less than 70 DEG C time, perform step 309;
Step 306, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 400ppm, or temperature be more than or equal to 70 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 400ppm, and the monitoring point that temperature is less than 70 DEG C, by the CO gas concentration that searches out be more than or equal to 400ppm, or the region of the monitoring point composition that temperature is be more than or equal to 70 DEG C is defined as spontaneous combustion in goaf deathtrap;When adjacent monitoring point CO gas concentration is respectively less than 400ppm, and when temperature is respectively less than 70 DEG C, the region that adjacent for central point monitoring point surrounds is defined as spontaneous combustion in goaf deathtrap;
Step 307, in region except the spontaneous combustion in goaf deathtrap searched out, the goaf, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 308, repeating step 305 to step 307, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 400ppm, and the highest monitoring point place temperature of temperature is less than 70 DEG C;
Step 309, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 100ppm, by monitoring point place temperature the highest for temperature compared with 50 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 100ppm, or the highest monitoring point place temperature of temperature be more than or equal to 50 DEG C time, perform step 3010; When the highest monitoring point place CO gas concentration of CO gas concentration is less than 100ppm, and the highest monitoring point place temperature of temperature less than 50 DEG C time, perform step 3013;
Step 3010, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 100ppm, or temperature be more than or equal to 50 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 100ppm, and the monitoring point that temperature is less than 50 DEG C, by the CO gas concentration that searches be more than or equal to 100ppm, or the region of the monitoring point composition that temperature is be more than or equal to 50 DEG C is defined as Residual coal in goaf and spontaneous combustion tendency region occurs; When adjacent monitoring point CO gas concentration is respectively less than 100ppm, and when temperature is respectively less than 50 DEG C, the region that adjacent for central point monitoring point surrounds is defined as doubtful Residual coal in goaf spontaneous combustion tendency region occurs;
Step 3011, in goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined in extra-regional region, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 3012, repeating step 309 to step 3011, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 100ppm, and the highest monitoring point place temperature of temperature is less than 50 DEG C;
Step 3013, by goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined to extra-regional region and is defined as spontaneous combustion in goaf low temperature eremacausis region;
Step 3014, described spontaneous combustion in goaf deathtrap, described Residual coal in goaf are occurred, and spontaneous combustion tendency region, described doubtful Residual coal in goaf occur that spontaneous combustion tendency region and described spontaneous combustion in goaf low temperature eremacausis zone marker are different colors, represent different danger early warning grades.
The above-mentioned goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that: step one is arranged multiple for detecting CO gas concentration, C in coal mine gob2H4The concrete mode of the gas concentration of gas concentration and temperature and temperature sensing probe is: powers in goaf and concatenates a gas concentration and temperature sensing probe on transmission line every 10 meters, a monitoring line is arranged every 10m at work surface twice place, in the middle part of work surface, arrange a monitoring line every 20m, monitor at every and line concatenates every 10 meters a gas concentration and temperature sensing probe.
The above-mentioned goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that: described power supply and transmission line and monitoring line are armouring transmission power transmission line.
The above-mentioned goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that: described gas concentration and temperature sensing probe are intrinsic safety type gas concentration and temperature sensing probe.
The above-mentioned goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that: downhole monitoring main frame described in step 2 is also to its CO gas concentration signal received, C2H4Gas concentration signal and temperature signal carry out storing and showing, and draw out CO gas concentration time history plot, C2H4Gas concentration time history plot and temperature time history plot display.
The above-mentioned goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that: in step 3014, described spontaneous combustion in goaf deathtrap is labeled as redness, represents that danger early warning grade is IV grade; Described Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is orange, represents that danger early warning grade is III grade; Described doubtful Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is yellow, represents that danger early warning grade is II grade; It is green by described spontaneous combustion in goaf low temperature eremacausis zone marker, represents that danger early warning grade is I level; When spontaneous combustion tendency area coincidence occur in described spontaneous combustion in goaf deathtrap and described Residual coal in goaf, it is labeled as redness, represents that danger early warning grade is IV grade; When described Residual coal in goaf occurs that spontaneous combustion tendency area coincidence occur in spontaneous combustion tendency region and described doubtful Residual coal in goaf, it is labeled as orange, represents that danger early warning grade is III grade; When described doubtful Residual coal in goaf spontaneous combustion tendency region occurs with described spontaneous combustion in goaf low temperature eremacausis area coincidence, it is labeled as yellow, represents that danger early warning grade is II grade; Wherein, I level, the danger early warning grade of II grade, III grade and IV grade arrange successively from low to high.
The present invention compared with prior art has the advantage that
1, the method step of the present invention is simple, novel in design reasonable, it is achieved convenient.
2, the present invention can comparatively accurately draw scattergram and the coal spontaneous combustion temperature field figure of goaf Coal Self-ignition Process index gas concentration, thus comprehensively understanding goaf it may happen that the overall condition in spontaneous combustion region so that fireproofing is accomplished to shoot the arrow at the target.
3, coal fire calamity danger method for early warning provided by the invention can not only judge the degree of danger of coal fire disaster exactly, and accurately can position coal spontaneous combustion deathtrap in goaf so that giving prominence to the key points in fireproofing face, uses manpower and material resources sparingly.
4, the automaticity of coal fire calamity danger method for early warning provided by the invention is high, intelligent high, CO gas concentration, C2H4Gas concentration and temperature data gather automatically according to gas concentration and temperature sensing probe, and by telecommunication optical fiber access industrial looped network, be transmitted further to ground monitoring computer, ground monitoring computer again each gas concentration of coal mine gob and temperature sensing are popped one's head in detect CO gas concentration, C2H4Gas concentration and temperature signal are analyzed processing, and carry out coal fire calamity danger early warning.
5, the reliability of coal fire calamity danger method for early warning provided by the invention is high, to the prediction of goaf coal spontaneous combustion degree comprehensively accurately, applied widely, it is adaptable to the coal mine gob in various exploitation situations.
6, the danger early warning grade in goaf is divided by the present invention according to the three phases of goaf Coal Self-ignition Process, and four the danger early warning grades marked off are respectively as follows: IV grade, spontaneous combustion in goaf deathtrap from high to low; III grade, Residual coal in goaf occur spontaneous combustion tendency region; II grade, doubtful Residual coal in goaf occur spontaneous combustion tendency region; I level, spontaneous combustion in goaf low temperature eremacausis region; And these regions are denoted as: green, yellow, orange and red, clear and intuitive react goaf coal spontaneous combustion situation, after being conducive to goaf is divided, take different countermeasure to prevent and treat.
7, the present invention's is practical, and result of use is good, it is simple to promote the use of.
In sum, the method step of the present invention is simple, and novel in design reasonable, it is achieved convenient, automaticity is high, and reliability is high, and the prediction of goaf coal spontaneous combustion degree is comprehensive accurately, and applied widely, practical, result of use is good, it is simple to promote the use of.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the annexation schematic diagram of coal spontaneous combustion index gas in coal mine gob of the present invention monitoring device.
Fig. 2 is gas concentration of the present invention and the temperature sensing probe layout schematic diagram in coal mine gob.
Fig. 3 is the method flow block diagram of the present invention goaf coal spontaneous combustion degree of danger differentiation based on index gas and method for early warning.
Description of reference numerals:
1 downhole monitoring main frame; 2 gas concentrations and temperature sensing probe; 3 monitoring lines;
4 telecommunication optical fibers; 5 work surfaces; 6 coal mine gobs;
7 ground monitoring computers; 8 industry looped networks.
Detailed description of the invention
As shown in Figure 1, Figure 2 and Figure 3, the goaf coal spontaneous combustion degree of danger based on index gas of the present invention differentiates and method for early warning, comprises the following steps:
The layout of step one, coal mine gob coal spontaneous combustion index gas monitoring device: arrange multiple for detecting CO gas concentration, C in coal mine gob 62H4The gas concentration of gas concentration and temperature and temperature sensing probe 2, it is monitoring point that definition is provided with the position of gas concentration and temperature sensing probe 2, and multiple gas concentrations and temperature sensing are popped one's head in 2 be connected to downhole monitoring main frame 1, described gas concentration and be integrated with CO gas sensor, C in temperature sensing probe 22H4Gas sensor and temperature sensor, described downhole monitoring main frame 1 by telecommunication optical fiber 4 access industrial looped network 8 and communicates with ground monitoring computer 7;
Step 2, the collection of coal mine gob coal spontaneous combustion index gas concentration and transmission: multiple gas concentrations and temperature sensing probe 2 are respectively to the CO gas concentration at its position place, C2H4Gas concentration and the temperature cycle of carrying out be T be periodically detected and be transferred to downhole monitoring main frame 1, the signal that downhole monitoring main frame 1 is received is transferred to ground monitoring computer 7 by telecommunication optical fiber 4 and industry looped network 8; Wherein, the value of T is 3～20 minutes; Preferably, the value of T is 10 minutes;
Each gas concentration of coal mine gob 6 and temperature sensing are popped one's head in the 2 CO gas concentrations detected, C by step 3, ground monitoring computer 72H4Gas concentration and temperature signal are analyzed processing, and carry out coal fire calamity danger early warning, and detailed process is:
Step 301, being inclined to direction with work surface 5 for X-axis, moving towards direction is Y-axis, with CO gas concentration, C2H4The height of gas concentration and temperature is Z axis, sets up rectangular coordinate system in space, draws coal mine gob CO gas concentration, C2H4Gas concentration and temperature field figure;Namely coal mine gob CO gas concentration, C are drawn2H4The three-dimensional distribution map of gas concentration and temperature, when being embodied as, is by coal mine gob CO gas concentration, C2H4Gas concentration and temperature field figure have been plotted under the same coordinate system;
Step 302, judge whether coal mine gob 6 occurs in that C2H4Gas, when occurring in that C2H4During gas, perform step 303, otherwise, perform step 304;
Step 303, will appear from C2H4The region of the monitoring point composition of gas is defined as spontaneous combustion in goaf deathtrap;
Step 304, in goaf except searching out C2H4In region outside gas zones, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 305, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 400ppm, by monitoring point place temperature the highest for temperature compared with 70 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 400ppm, or the highest monitoring point place temperature of temperature be more than or equal to 70 DEG C time, perform step 306; When the highest monitoring point place CO gas concentration of CO gas concentration is less than 400ppm, and the highest monitoring point place temperature of temperature less than 70 DEG C time, perform step 309;
Step 306, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 400ppm, or temperature be more than or equal to 70 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 400ppm, and the monitoring point that temperature is less than 70 DEG C, by the CO gas concentration that searches out be more than or equal to 400ppm, or the region of the monitoring point composition that temperature is be more than or equal to 70 DEG C is defined as spontaneous combustion in goaf deathtrap; When adjacent monitoring point CO gas concentration is respectively less than 400ppm, and when temperature is respectively less than 70 DEG C, the region that adjacent for central point monitoring point surrounds is defined as spontaneous combustion in goaf deathtrap;
Step 307, in region except the spontaneous combustion in goaf deathtrap searched out, the goaf, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 308, repeating step 305 to step 307, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 400ppm, and the highest monitoring point place temperature of temperature is less than 70 DEG C;
Step 309, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 100ppm, by monitoring point place temperature the highest for temperature compared with 50 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 100ppm, or the highest monitoring point place temperature of temperature be more than or equal to 50 DEG C time, perform step 3010; When the highest monitoring point place CO gas concentration of CO gas concentration is less than 100ppm, and the highest monitoring point place temperature of temperature less than 50 DEG C time, perform step 3013;
Step 3010, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 100ppm, or temperature be more than or equal to 50 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 100ppm, and the monitoring point that temperature is less than 50 DEG C, by the CO gas concentration that searches be more than or equal to 100ppm, or the region of the monitoring point composition that temperature is be more than or equal to 50 DEG C is defined as Residual coal in goaf and spontaneous combustion tendency region occurs;When adjacent monitoring point CO gas concentration is respectively less than 100ppm, and when temperature is respectively less than 50 DEG C, the region that adjacent for central point monitoring point surrounds is defined as doubtful Residual coal in goaf spontaneous combustion tendency region occurs;
Step 3011, in goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined in extra-regional region, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 3012, repeating step 309 to step 3011, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 100ppm, and the highest monitoring point place temperature of temperature is less than 50 DEG C;
Step 3013, by goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined to extra-regional region and is defined as spontaneous combustion in goaf low temperature eremacausis region; By the CO gas concentration of the highest monitoring point of CO gas concentration in goaf less than 100ppm, and the region that the temperature of the highest monitoring point of temperature is less than 50 DEG C is defined as spontaneous combustion in goaf low temperature eremacausis region;
Step 3014, described spontaneous combustion in goaf deathtrap, described Residual coal in goaf are occurred, and spontaneous combustion tendency region, described doubtful Residual coal in goaf occur that spontaneous combustion tendency region and described spontaneous combustion in goaf low temperature eremacausis zone marker are different colors, represent different danger early warning grades.
As it is shown in figure 1, in the present embodiment, step one is arranged multiple for detecting CO gas concentration, C in coal mine gob 62H4The concrete mode of the gas concentration of gas concentration and temperature and temperature sensing probe 2 is: powers in goaf and concatenates a gas concentration and temperature sensing probe 2 on transmission line every 10 meters, a monitoring line 3 is arranged every 10m at work surface 5 twice place, in the middle part of work surface 5, arrange a monitoring line 3 every 20m, monitor at every and line 3 concatenates every 10 meters a gas concentration and temperature sensing probe 2. When being embodied as, the layout of measuring point can carry out suitable adjustment according to the actual needs.
In the present embodiment, described power supply and transmission line and monitoring line 3 are armouring transmission power transmission line. Armouring transmission power transmission line has tensile strength height, is not easily torn in goaf, highly reliable feature.
In the present embodiment, described gas concentration and temperature sensing probe 2 are intrinsic safety type gas concentration and temperature sensing probe.
In the present embodiment, downhole monitoring main frame described in step 21 is also to its CO gas concentration signal received, C2H4Gas concentration signal and temperature signal carry out storing and showing, and draw out CO gas concentration time history plot, C2H4Gas concentration time history plot and temperature time history plot display.
In the present embodiment, in step 3014, described spontaneous combustion in goaf deathtrap is labeled as redness, represents that danger early warning grade is IV grade; Described Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is orange, represents that danger early warning grade is III grade; Described doubtful Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is yellow, represents that danger early warning grade is II grade; It is green by described spontaneous combustion in goaf low temperature eremacausis zone marker, represents that danger early warning grade is I level; When described spontaneous combustion in goaf deathtrap and institute goaf state something lost coal spontaneous combustion tendency area coincidence occurs time, be labeled as redness, represent that danger early warning grade is IV grade;When described Residual coal in goaf occurs that spontaneous combustion tendency area coincidence occur in spontaneous combustion tendency region and described doubtful Residual coal in goaf, it is labeled as orange, represents that danger early warning grade is III grade; When described doubtful Residual coal in goaf spontaneous combustion tendency region occurs with described spontaneous combustion in goaf low temperature eremacausis area coincidence, it is labeled as yellow, represents that danger early warning grade is II grade; Wherein, I level, the danger early warning grade of II grade, III grade and IV grade arrange successively from low to high.
In sum, the danger early warning grade in goaf is divided by the present invention according to the three phases of goaf Coal Self-ignition Process, and wherein, the three phases of goaf Coal Self-ignition Process is respectively as follows:
First stage, spontaneous combustion in goaf low temperature eremacausis stage: this is the cold stage of oxidation of coal, owing to coal temperature is relatively low, coal oxygen response speed is relatively slow, and its oxidation product generation amount is less, goaf can measure the CO concentration of oxidation of coal generation and be generally less than 100ppm, will not produce C2H4Gas, records coal temperature lower than 50 DEG C, it is possible to determine that this region, goaf belongs to the cold stage of spontaneous combustion in goaf oxidation;
Second stage, there is the spontaneous combustion tendency stage in Residual coal in goaf: goaf coal is when suitable oxygen concentration and accumulation of heat, Residual coal in goaf and oxygen contact and the rising of its constant temperature through the long period, the CO concentration that oxidation produces continues to be increased beyond 100ppm but is less than 400ppm, coal temperature more than 50 DEG C less than 70 DEG C of critical temperatures close to coal, but without detecting C2H4The generation of gas, now can be concluded that coal is in the boost phase of coal spontaneous combustion oxidation, and now coal has certain self-ignition fatalness;
Phase III, spontaneous combustion in goaf distress phase: Residual coal in goaf enter oxidation of coal boost phase with, continue to aoxidize if the environment in goaf is still suitable for losing coal, the oxidizing process of Residual coal in goaf will be more deep carrying out, the degree of danger of its spontaneous combustion can be continuously increased, when C occur in oxidation of coal product2H4Gas, mark Residual coal in goaf enters spontaneous combustion distress phase now CO concentration can up to 400ppm, and the temperature of coal body reaches 70 DEG C; If taking correct measure, coal spontaneous combustion oxidation rate constantly accelerate quickly or coal spontaneous combustion fire occurs not in time in this stage.
Four the danger early warning grades marked off are respectively as follows: IV grade, spontaneous combustion in goaf deathtrap from high to low; III grade, Residual coal in goaf occur spontaneous combustion tendency region; II grade, doubtful Residual coal in goaf occur spontaneous combustion tendency region; I level, spontaneous combustion in goaf low temperature eremacausis region.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure change above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (6)
1. the goaf coal spontaneous combustion degree of danger based on index gas differentiates and method for early warning, it is characterised in that the method comprises the following steps:
The layout of step one, coal mine gob coal spontaneous combustion index gas monitoring device: arrange multiple for detecting CO gas concentration, C in coal mine gob (6)2H4The gas concentration of gas concentration and temperature and temperature sensing probe (2), it is monitoring point that definition is provided with the position of gas concentration and temperature sensing probe (2), and multiple gas concentrations and temperature sensing popped one's head in (2) are connected to downhole monitoring main frame (1), described gas concentration and be integrated with CO gas sensor, C in temperature sensing probe (2)2H4Gas sensor and temperature sensor, described downhole monitoring main frame (1) communicates by telecommunication optical fiber (4) access industrial looped network (8) and with ground monitoring computer (7);
Step 2, the collection of coal mine gob coal spontaneous combustion index gas concentration and transmission: multiple gas concentrations and temperature sensing probe (2) are respectively to the CO gas concentration at its position place, C2H4Gas concentration and the temperature cycle of carrying out be T be periodically detected and be transferred to downhole monitoring main frame (1), the signal that downhole monitoring main frame (1) is received is transferred to ground monitoring computer (7) by telecommunication optical fiber (4) and industrial looped network (8); Wherein, the value of T is 3～20 minutes;
Coal mine gob (6) each gas concentration and temperature sensing are popped one's head in CO gas concentration that (2) detect, C by step 3, ground monitoring computer (7)2H4Gas concentration and temperature signal are analyzed processing, and carry out coal fire calamity danger early warning, and detailed process is:
Step 301, with work surface (5) be inclined to direction for X-axis, moving towards direction is Y-axis, with CO gas concentration, C2H4The height of gas concentration and temperature is Z axis, sets up rectangular coordinate system in space, draws coal mine gob CO gas concentration, C2H4Gas concentration and temperature field figure;
Step 302, judge whether coal mine gob (6) occurs in that C2H4Gas, when occurring in that C2H4During gas, perform step 303, otherwise, perform step 304;
Step 303, will appear from C2H4The region of the monitoring point composition of gas is defined as spontaneous combustion in goaf deathtrap;
Step 304, in goaf except searching out C2H4In region outside gas zones, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 305, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 400ppm, by monitoring point place temperature the highest for temperature compared with 70 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 400ppm, or the highest monitoring point place temperature of temperature be more than or equal to 70 DEG C time, perform step 306; When the highest monitoring point place CO gas concentration of CO gas concentration is less than 400ppm, and the highest monitoring point place temperature of temperature less than 70 DEG C time, perform step 309;
Step 306, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 400ppm, or temperature be more than or equal to 70 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 400ppm, and the monitoring point that temperature is less than 70 DEG C, by the CO gas concentration that searches out be more than or equal to 400ppm, or the region of the monitoring point composition that temperature is be more than or equal to 70 DEG C is defined as spontaneous combustion in goaf deathtrap; When adjacent monitoring point CO gas concentration is respectively less than 400ppm, and when temperature is respectively less than 70 DEG C, the region that adjacent for central point monitoring point surrounds is defined as spontaneous combustion in goaf deathtrap;
Step 307, in region except the spontaneous combustion in goaf deathtrap searched out, the goaf, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 308, repeating step 305 to step 307, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 400ppm, and the highest monitoring point place temperature of temperature is less than 70 DEG C;
Step 309, by monitoring point place CO gas concentration the highest for CO gas concentration compared with 100ppm, by monitoring point place temperature the highest for temperature compared with 50 DEG C, when the highest monitoring point place CO gas concentration of CO gas concentration is be more than or equal to 100ppm, or the highest monitoring point place temperature of temperature be more than or equal to 50 DEG C time, perform step 3010;When the highest monitoring point place CO gas concentration of CO gas concentration is less than 100ppm, and the highest monitoring point place temperature of temperature less than 50 DEG C time, perform step 3013;
Step 3010, centered by the monitoring point that the highest monitoring point of CO gas concentration or temperature are the highest the some monitoring point that outwards search is adjacent, when the CO gas concentration of adjacent Zhong You monitoring point, monitoring point is be more than or equal to 100ppm, or temperature be more than or equal to 50 DEG C time, monitoring point is searched again for outside consecutive points, until searching CO gas concentration less than 100ppm, and the monitoring point that temperature is less than 50 DEG C, by the CO gas concentration that searches be more than or equal to 100ppm, or the region of the monitoring point composition that temperature is be more than or equal to 50 DEG C is defined as Residual coal in goaf and spontaneous combustion tendency region occurs; When adjacent monitoring point CO gas concentration is respectively less than 100ppm, and when temperature is respectively less than 50 DEG C, the region that adjacent for central point monitoring point surrounds is defined as doubtful Residual coal in goaf spontaneous combustion tendency region occurs;
Step 3011, in goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined in extra-regional region, search out the highest monitoring point of CO gas concentration and the highest monitoring point of temperature;
Step 3012, repeating step 309 to step 3011, until the monitoring point place CO gas concentration that in the remaining area in goaf, CO gas concentration is the highest is less than 100ppm, and the highest monitoring point place temperature of temperature is less than 50 DEG C;
Step 3013, by goaf except the spontaneous combustion in goaf deathtrap that searches out, Residual coal in goaf occur that spontaneous combustion tendency region and doubtful Residual coal in goaf occur that spontaneous combustion is inclined to extra-regional region and is defined as spontaneous combustion in goaf low temperature eremacausis region;
Step 3014, described spontaneous combustion in goaf deathtrap, described Residual coal in goaf are occurred, and spontaneous combustion tendency region, described doubtful Residual coal in goaf occur that spontaneous combustion tendency region and described spontaneous combustion in goaf low temperature eremacausis zone marker are different colors, represent different danger early warning grades.
2. the goaf coal spontaneous combustion degree of danger based on index gas described in claim 1 differentiates and method for early warning, it is characterised in that: step one is arranged multiple for detecting CO gas concentration, C in coal mine gob (6)2H4The concrete mode of the gas concentration of gas concentration and temperature and temperature sensing probe (2) is: powers in goaf and concatenates a gas concentration and temperature sensing probe (2) on transmission line every 10 meters, monitoring line (3) is arranged every 10m at work surface (5) twice place, arrange monitoring line (3) at work surface (5) middle part every 20m, monitor at every and line (3) concatenates every 10 meters a gas concentration and temperature sensing probe (2).
3. the goaf coal spontaneous combustion degree of danger based on index gas described in claim 2 differentiates and method for early warning, it is characterised in that: described power supply and transmission line and monitoring line (3) are armouring transmission power transmission line.
4. the goaf coal spontaneous combustion degree of danger based on index gas described in claim 1 differentiates and method for early warning, it is characterised in that: described gas concentration and temperature sensing probe (2) are popped one's head in for intrinsic safety type gas concentration and temperature sensing.
5. the goaf coal spontaneous combustion degree of danger based on index gas described in claim 1 differentiates and method for early warning, it is characterised in that: downhole monitoring main frame described in step 2 (1) is also to its CO gas concentration signal received, C2H4Gas concentration signal and temperature signal carry out storing and showing, and draw out CO gas concentration time history plot, C2H4Gas concentration time history plot and temperature time history plot display.
6. the goaf coal spontaneous combustion degree of danger based on index gas described in claim 1 differentiates and method for early warning, it is characterised in that: in step 3014, described spontaneous combustion in goaf deathtrap is labeled as redness, represents that danger early warning grade is IV grade; Described Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is orange, represents that danger early warning grade is III grade; Described doubtful Residual coal in goaf is occurred, and spontaneous combustion tendency zone marker is yellow, represents that danger early warning grade is II grade; It is green by described spontaneous combustion in goaf low temperature eremacausis zone marker, represents that danger early warning grade is I level; When spontaneous combustion tendency area coincidence occur in described spontaneous combustion in goaf deathtrap and described Residual coal in goaf, it is labeled as redness, represents that danger early warning grade is IV grade; When described Residual coal in goaf occurs that spontaneous combustion tendency area coincidence occur in spontaneous combustion tendency region and described doubtful Residual coal in goaf, it is labeled as orange, represents that danger early warning grade is III grade; When described doubtful Residual coal in goaf spontaneous combustion tendency region occurs with described spontaneous combustion in goaf low temperature eremacausis area coincidence, it is labeled as yellow, represents that danger early warning grade is II grade; Wherein, I level, the danger early warning grade of II grade, III grade and IV grade arrange successively from low to high.
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