CN108931499A - A kind of coal spontaneous combustion oxygen concentration experiment test device and experimental test procedures - Google Patents
A kind of coal spontaneous combustion oxygen concentration experiment test device and experimental test procedures Download PDFInfo
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- CN108931499A CN108931499A CN201810938686.7A CN201810938686A CN108931499A CN 108931499 A CN108931499 A CN 108931499A CN 201810938686 A CN201810938686 A CN 201810938686A CN 108931499 A CN108931499 A CN 108931499A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention relates to coal spontaneous combustion experimental technique fields, disclose a kind of coal spontaneous combustion oxygen concentration experiment test device and experimental test procedures, experiment test device includes: furnace body, multiple first through hole are uniformly provided on the side wall of furnace body, multiple second through-holes and multiple mouths that leak out, multiple ceramic heating bars are equipped in furnace body, multiple rod irons, multiple temperature sensors and multiple gas collecting copper pipes, furnace body is externally provided with temperature control equipment, gas absorption cell, oxygen laser spectrum detection device, data collecting card and computer control system, multiple ceramic heating bars and multiple temperature sensors are connect with temperature control equipment respectively, temperature control equipment is connect with data collecting card, data collecting card and oxygen laser spectrum detection device are connect with computer control system respectively, this coal spontaneous combustion oxygen concentration experiment test device and experimental test procedures, energy Enough it is effectively tested the variation of the oxygen concentration of coal spontaneous combustion.
Description
Technical field
The present invention relates to coal spontaneous combustion experimental technique field, in particular to a kind of coal spontaneous combustion oxygen concentration experiment test device and
Experimental test procedures.
Background technique
Coal spontaneous combustion refers to not ignited and hypergolic phenomenon, and freely burning fire includes coalfield selfcombustion and mine spontaneous combustion.Coal
Field spontaneous combustion refers under auto-ignition environment, because aoxidizing the coal seam for the spontaneous combustion state that heat build-up causes along the phenomenon that burning of appearing.Coalfield is certainly
Combustion is constantly formed by large area underground coal fire to deep development, is one of great spontaneous combustion disaster of facing mankind.Due to coalfield
Spontaneous combustion is difficult to control, and difficulty of governance is big, becomes extremely difficult and solves the problems, such as.
Research for currently available technology is established in pittsburgh,U.S.A lab design and is justified for J.B.Stott etc. 1979
Cylindricality coal spontaneous ignition experimental furnace carries out mass transfer, the diabatic process research of coal spontaneous combustion.X.D.Chen etc. is in the 1987-1990 term
Between, coal body self-ignition experiment stand is established again in University of Canterbury, the oxygen consumption and conductivity of heat for Study on Coal.The nineties with
Afterwards, there is the spontaneous combustion of coal experimental bench of large-tonnage.Establish within A.C.Smith etc. 1991 13 tons of coal capacity of big moulded coal
Spontaneous combustion experimental furnace；Establish within D.Cliiff etc. 1998 16 tons of coal capacity of large-scale coal spontaneous combustion experimental furnace.Xu Jingcai is in 20th century
Autonomous Design and the large-scale self-ignition experiment stand in first of China (coalingging 0.85 ton) is had developed the end of the eighties, later to the reality
It tests on the basis of platform improves promotion, coal capacity is expanded to 1.5 tons, and coal capacity is expanded to about after modernization overlay in 2013
2.5 tons, and 15 tons of the large-scale experiment furnace of capable of coalingging is established in Shandong Yanzhou Mining Group south village coal mine.Certainly by experimental bench simulation
The development process for firing fire occurs coal fire, the critical-temperature in development process, oxygen consumption rate, heating strength, most short hair naturally
The parameters such as fiery phase have carried out relevant research.
In conclusion existing experimental method is at high cost at present, experimental period is long, coalfield selfcombustion fire prediction is forecast
Technology leaks out on difference, and to influence research insufficient for position and oxygen concentration field distribution bring, is unable to satisfy and predicts skill to coal spontaneous combustion
The needs of art, it is even more impossible to provide in more efficiently characterisitic parameter and work to provide more efficiently technology and refer to for actual production
It leads.
Summary of the invention
The present invention provides a kind of coal spontaneous combustion oxygen concentration experiment test device and experimental test procedures, can solve existing skill
The above problem in art.
The present invention provides a kind of coal spontaneous combustion oxygen concentration experiment test devices, comprising: furnace body, on the side wall of furnace body uniformly
Be equipped with equipped with multiple first through hole, multiple second through-holes and multiple mouths that leak out, in furnace body multiple ceramic heating bars, multiple rod irons,
Multiple temperature sensors and multiple gas collecting copper pipes, multiple ceramic heating bars, which are corresponded, is inserted into furnace by multiple first through hole
In vivo, multiple rod irons are corresponded is inserted into furnace body by multiple second through-holes, and multiple rod irons are close to furnace body center position
It is respectively and fixedly provided with gas collecting copper pipe, is being respectively and fixedly provided with temperature sensor, multiple ceramic heating bars and multiple rod irons at furnace wall
It is arranged in furnace body according to the azimuth crossings of east, south, west, north four, the spacing between two neighbouring ceramic heating bars is
150mm, furnace body is equipped with temperature control equipment, furnace body is externally provided with gas absorption cell, oxygen laser spectrum detection device, data and adopts
Truck and computer control system, multiple ceramic heating bars and multiple temperature sensors are connect with temperature control equipment respectively, more
A gas collecting copper pipe is connected with gas absorption cell, the setting of oxygen laser spectrum detection device face gas absorption cell, temperature
Control device is connect with data collecting card, data collecting card and oxygen laser spectrum detection device respectively with computer control system
Connection.
Multiple mouths that leak out connect air pump by admission line respectively, and air pump is equipped with solenoid valve, on admission line
Equipped with flowmeter, flowmeter is connect with data collecting card, and solenoid valve is connected with computer control system.
The bottom of the furnace body is equipped with multiple hydraulic supports, and multiple hydraulic supports are uniformly arranged on the peripheral edge of bottom of furnace body
Edge.
The ceramic heating bar is 24, and rod iron is 48, and temperature sensor is 48, and gas collecting copper pipe is 48,
The mouth that leaks out is 100.
The oxygen laser spectrum detection device includes: signal generator, laser driver, Distributed Feedback Laser, fiber optic collimator
Device, gas absorption cell, the photodetector with preamplifier, lock-in amplifier, laser driver and lock-in amplifier difference
It is connect with signal generator, laser driver, Distributed Feedback Laser and optical fiber collimator are sequentially connected, gas absorption cell face optical fiber
Collimator and with preamplifier photodetector setting, photodetector, lock-in amplifier and meter with preamplifier
It calculates machine control system to be sequentially connected, signal generator generates a letter being superimposed by low frequency sawtooth signal with high frequency sinusoidal signal
Number, absorption peak of the low frequency sawtooth modulated signal slowly to scan oxygen；High frequency sinusoidal signal is passed through to generate harmonic signal
Cross after laser driver and Distributed Feedback Laser and convert electrical signals to laser sending, laser be incident on after optical fiber collimator filled with
In the gas absorption cell of oxygen, then line focus lens are injected in the photodetector with preamplifier；Band preamplifier
Photodetector the faint optical signal after gas absorption cell is converted into ultra-weak electronic signal after be sent to lock-in amplifier,
Lock-in amplifier extracts ultra-weak electronic signal and carries out harmonic detecting, and the second harmonic signal that lock-in amplifier will test out is transmitted to meter
Machine control system is calculated, computer control system is finally inversed by oxygen concentration according to Lambert-Beer's law.
Be equipped in the gas absorption cell: spherical surface object lens B, spherical surface object lens C, spherical surface field lens M, incident deflecting mirror and outgoing are inclined
Tilting mirror, incident deflecting mirror and outgoing deflecting mirror are respectively positioned at the edge of field lens M, the distance of field lens M to object lens B and field lens M to object
The distance between mirror C is equal to the radius of curvature R of field lens M, and the center of curvature CC [M] of field lens M is located at the friendship of object lens B and object lens C
At boundary, the center of curvature of object lens B is located at point CC [B] on field lens M, and the center of curvature of object lens C is located at point CC [C], object lens on field lens M
Center of curvature CC [C] being equidistant to field lens M central point of the center of curvature CC [B] and object lens C of B.
The multiple temperature sensor is K-type thermocouple temperature sensor.
The furnace body includes internal layer, middle layer and outer layer, and internal layer is equipped with refractory brick, and middle layer is equipped with insulating layer, and insulating layer is selected
Aerogel material is made, and outer layer is made of carbon steel material.
A kind of experimental test procedures of coal spontaneous combustion oxygen concentration experiment test device, comprising the following steps:
S1, the distributional analysis that coal sample partial size will be carried out after coal sample reduction by jaw crusher；
S2, particle diameter distribution is analyzed after coal sample put into furnace body in；
S3, multiple ceramic heating bars are inserted into coal sample by multiple first through hole, not by temperature control equipment control
Ceramic heating bar with position carries out heat temperature raising to coal sample, and multiple rod irons are inserted into furnace body by multiple second through-holes, are led to
It crosses multiple temperature sensors to monitor the temperature of different location in real time, the temperature variations of different location are adopted by data
Truck is transmitted to computer control system and is analyzed；
S4, by leaking out, mouth changes the intracorporal ventilation quantity of furnace, passes through gas using the detection of oxygen laser spectrum detection device
Acquisition copper pipe enters the oxygen in the furnace gas of gas absorption cell, and is finally inversed by different location by computer control system
Oxygen concentration；
S5, computer control system coal spontaneous combustion is determined according to heating temperature and oxygen concentration needed for temperature and oxygen it is dense
Degree.
The ventilation quantity of the mouth that leaks out in step S4 is to control solenoid valve by computer control system to open air pump simultaneously
The ventilation quantity for the mouth that leaks out is calculated according to the flowmeter on admission line.
Compared with prior art, the beneficial effects of the present invention are:
Coal spontaneous combustion oxygen concentration experiment test device of the invention has quick, efficient, accuracy height and real time monitoring
The advantages of.It can effectively be monitored by the gas collecting point and temperature monitoring point of each layer arrangement different in the case where coal spontaneous combustion
The movement law in position gas situation of change and temperature field；It is dense that oxygen is effectively monitored by oxygen laser spectrum detection device
The situation of change of degree, to obtain the regularity of distribution of the oxygen concentration field in spontaneous combustion of coal seam；Pass through leaking out for different location
Mouth changes ventilation quantity, and then studies difference and leak out position to temperature profile effect；This experimental provision coal consumption is relatively fewer, test
Period is short, can largely reduce experimental cost and improve the precision of experimental data.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of coal spontaneous combustion oxygen concentration experiment test device longitudinal section provided by the invention.
Fig. 2 is a kind of functional block diagram of coal spontaneous combustion oxygen concentration experiment test device provided by the invention.
Fig. 3 is the structural schematic diagram of gas absorption cell of the present invention.
Fig. 4 is the structural schematic diagram of oxygen laser spectrum detection device of the present invention.
Fig. 5 is the flow chart of coal spontaneous combustion oxygen concentration experimental test procedures of the present invention.
Description of symbols:
1- furnace body, 2- temperature control equipment, 3- ceramic heating bar, 4- rod iron, 5- hydraulic support, 6- first through hole, 7-
Two through-holes, 8- leak out mouth, 9- computer control system, 10- temperature sensor, 11- gas collecting copper pipe, 12- gas absorption cell,
13- oxygen laser spectrum detection device, 14- data collecting card.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
As depicted in figs. 1 and 2, a kind of coal spontaneous combustion oxygen concentration experiment test device provided in an embodiment of the present invention, comprising:
Furnace body 1 is uniformly provided with multiple first through hole 6, multiple second through-holes 7 and multiple mouths 8 that leak out on the side wall of furnace body 1, sets in furnace body 1
There are multiple ceramic heating bars 3, multiple rod irons 4, multiple temperature sensors 10 and multiple gas collecting copper pipes 11, multiple ceramic heats
Stick 3 is corresponded to be inserted into furnace body 1 by multiple first through hole 6, and multiple rod irons 4 are corresponded to be inserted by multiple second through-holes 7
Enter in furnace body 1, multiple rod irons 4 are being respectively and fixedly provided with gas collecting copper pipe 11 close to furnace body center position, equal at furnace wall
It is fixed with temperature sensor 10, multiple ceramic heating bars 3 and multiple rod irons 4 are according to the azimuth crossings cloth of east, south, west, north four
It sets in furnace body 1, the spacing between two neighbouring ceramic heating bars 3 is 150mm, and furnace body 1 is equipped with temperature control dress
It sets 2, furnace body 1 and is externally provided with gas absorption cell 12, oxygen laser spectrum detection device 13, data collecting card 14 and computer control system
System 9, multiple ceramic heating bars 3 and multiple temperature sensors 10 are connect with temperature control equipment 2 respectively, multiple gas collecting copper pipes
11 are connected with gas absorption cell 12, the setting of 13 face gas absorption cell 12 of oxygen laser spectrum detection device, temperature control dress
It sets 2 to connect with data collecting card 14, data collecting card 14 and oxygen laser spectrum detection device 13 control with computer respectively and be
9 connection of system, data collecting card 14 are attached with computer control system 9 using LORA wireless technology.
The course of work and principle: multiple ceramic heating bars 3 are entered in furnace body 1 by multiple first through hole 6, in furnace body 1
The coal sample of different location is heated, and oxygen laser spectrum detection device 13 is interior by multiple gases by detection gas absorption cell 12
Acquisition copper pipe 11 acquires the gas of different location to detect to the oxygen concentration of different location, passes through temperature control equipment 2
The heating temperature for controlling multiple ceramic heating bars 3 heats coal sample, is detected in coal sample not by multiple temperature sensors 10
With the temperature of position, different leak out mouth 8 by turning off or on and control the air inlet in furnace body 1, computer control
The real-time oxygen concentration at real time temperature and different location that system 9 passes through the different heating position of acquisition determines spontaneous combustion of coal seam
In the case of oxygen concentration field the regularity of distribution.
As shown in Figure 1, the arrangement of ceramic heating bar 3 uses due east, due south, due west, the arrangement of due north arranges three altogether
Layer.This arrangement can rationally effectively use each device, each ceramic heating bar 3 can make the coal sample in furnace body 1 by
It is hot uniformly to avoid the occurrence of the excessively high situation of local coal temperature, it is reasonable to simulate coalfield selfcombustion situation, each temperature sensor 10
Can be under effective real-time monitoring coal spontaneous combustion, the situation of change of temperature, each gas collecting copper pipe can be to changing different air feeds
Under the different condition of position and coal body during heating, gas collection is carried out, avoids the occurrence of local location gas detection not
To the case where.
Experiment test device of the invention is non-contact, quick, efficient, highly selective, high sensitivity and real time on-line monitoring,
The trace of oxygen gas in real-time detection Coal Self-ignition Process changes, and grasps the degree of spontaneous combustion of coal in time, realizes coal spontaneous combustion
Early warning, improve the precision of experimental data.
Multiple mouths 8 that leak out connect air pump by admission line respectively, and air pump is equipped with solenoid valve, on admission line
Equipped with flowmeter, flowmeter is connect with data collecting card 14, computer control system 9 using LORA wireless technology to solenoid valve into
Row control.
The relationship between air intake and oxygen concentration in order to grasp multiple mouths 8 that leak out, passes through solenoid valve and flow
It counts to control the air intake of multiple mouths 8 that leak out.
The bottom of the furnace body 1 is equipped with multiple hydraulic supports 5, and multiple hydraulic supports 5 are uniformly arranged on the week of 1 bottom of furnace body
To edge.
Change the tilt angle of furnace body 1 by changing the height of the hydraulic stem in multiple hydraulic supports 5, left and right ends can
It controls respectively, for simulating coal body spontaneous combustion development trend under different coal occurrence status.
The ceramic heating bar 3 is 24, and rod iron 4 is 48, and temperature sensor 10 is 48, and gas collecting copper pipe 11 is
48, the mouth 8 that leaks out is 100.
The furnace body 1 is cuboid, and the outer dimension L*W*H of furnace body 1 is 700mm*700mm*650mm, the furnace in furnace body 1
The outer dimension L*W*H of thorax is 600mm*600mm*600mm, wall thickness 50mm.
Furnace body apparent size be long 700mm × wide 700mm × high 650mm, size of burner hearth be long 600mm × wide 600mm ×
High 600mm, wall thickness 50mm.Experiment institute's coal consumption is directly placed into furnace body after break process, and coal capacity is about 0.367
Ton, the diameter that leaks out are 5mm, and the diameter of first through hole 6 and the second through-hole 7 is 10mm.
As shown in figure 4, the oxygen laser spectrum detection device 9 includes: signal generator, laser driver, DFB laser
Device (distributed feedback laser), optical fiber collimator, gas absorption cell, the photodetector with preamplifier, locking phase amplification
Device, laser driver and lock-in amplifier are connect with signal generator respectively, laser driver, Distributed Feedback Laser and fiber optic collimator
Device is sequentially connected, gas absorption cell face optical fiber collimator and the photodetector setting with preamplifier, with preposition amplification
Photodetector, lock-in amplifier and the computer control system of device are sequentially connected, and signal generator generates one and sawed by low frequency
The signal that tooth wave signal is superimposed with high frequency sinusoidal signal, absorption peak of the low frequency sawtooth modulated signal slowly to scan oxygen；
High frequency sinusoidal signal converts electrical signals to laser hair to generate harmonic signal after laser driver and Distributed Feedback Laser
Out, laser is incident in the gas absorption cell filled with oxygen after optical fiber collimator, and then line focus lens are injected with preceding storing
In the photodetector of big device；Photodetector with preamplifier converts the faint optical signal after gas absorption cell
At lock-in amplifier is sent to after ultra-weak electronic signal, lock-in amplifier extracts ultra-weak electronic signal and carries out harmonic detecting, locking phase amplification
The second harmonic signal that device will test out is transmitted to computer control system, and computer control system 9 is according to Lambert-Beer's law
It is finally inversed by oxygen concentration.It is non-linear using Levenberg-Marquardt in order to accurately extract oxygen second harmonic peak signal
Type fitting algorithm, this method are a kind of iterative methods, it be by iterate make objective function obtain minimum value, and then find out to
Seek parametric optimal solution.Lorentzian curve is selected to carry out linear fit as spectrum, after being fitted, gained fitting parameter is used for
The calculating of oxygen purity.
Wavelength selected by light source is the Nanoplus Distributed Feedback Laser semiconductor laser of 760nm
Device.
It is equipped in the gas absorption cell 12: spherical surface object lens B, spherical surface object lens C, spherical surface field lens M, incident deflecting mirror and outgoing
Deflecting mirror, incident deflecting mirror and outgoing deflecting mirror are respectively positioned at the edge of field lens M, and the distance and field lens M of field lens M to object lens B arrives
The distance between object lens C is equal to the radius of curvature R of field lens M, and the center of curvature CC [M] of field lens M is located at object lens B's and object lens C
Intersection, the center of curvature of object lens B are located at point CC [B] on field lens M, and the center of curvature of object lens C is located at point CC [C], object on field lens M
Center of curvature CC [C] being equidistant to field lens M central point of the center of curvature CC [B] and object lens C of mirror B.
As shown in figure 3, the distance between field lens M and object lens B, C are equal to their radius of curvature R, by geometric optics knowledge
It is easy to get, the radius of curvature of spherical mirror is twice of its focal length f, i.e. R=2f.The center of curvature CC [M] of field lens M is located at object lens B and C
Intersection.And the center of curvature CC [B] and CC [C] of object lens B and C are respectively positioned on field lens M, the wherein center of curvature CC of object lens B
[B] is located at the lower section of central point in field lens M, and the center of curvature CC [C] of object lens C is located at the top of field lens M, two centers of curvature to ball
The central point of face mirror M is equidistant, and is L, and L is a distance of very little.
In addition, being also equipped with an incidence deflecting mirror ITM and an outgoing deflecting mirror OTM at the edge field lens M.General feelings
Under condition, when the structure determination in White pond, the position for being emitted deflecting mirror has the position of incident deflecting mirror to determine.Their effect point
It is not that light is reflected into and reflected White pond, in addition, the position by adjusting the two deflecting mirrors can also adjust White pond
In optical path length.
The multiple temperature sensor 10 is K-type thermocouple temperature sensor.
The furnace body 1 includes internal layer, middle layer and outer layer, and internal layer is equipped with refractory brick, and middle layer is equipped with insulating layer, and insulating layer is selected
Aerogel material is made, and outer layer is made of carbon steel material.
Insulating layer avoids the temperature in furnace body 1 by the outside heat transfer of furnace body, and the situation of spontaneous combustion of simulated coal improves experiment
Process.
As shown in figure 5, a kind of coal spontaneous combustion oxygen concentration experimental test procedures, comprising the following steps:
S1, the distributional analysis that coal sample partial size will be carried out after coal sample reduction by jaw crusher；
S2, particle diameter distribution is analyzed after coal sample put into furnace body 1 in；
S3, multiple ceramic heating bars 3 are inserted into coal sample by multiple first through hole 6, are controlled by temperature control equipment 2
The ceramic heating bar 3 of different location carries out heat temperature raising to coal sample, and multiple rod irons 4 are inserted into furnace body 1 by multiple second through-holes 7
It is interior, the temperature of different location is monitored in real time by multiple temperature sensors 10, the temperature variations of different location are logical
It crosses data collecting card 14 and is transmitted to computer control system 9 and analyzed；
S4, the ventilation quantity in furnace body 1 is changed by the mouth 8 that leaks out, gas is passed through using the detection of oxygen laser spectrum detection device 9
Body acquires the oxygen that siphunculus 11 enters in the furnace gas of gas absorption cell 12, and is finally inversed by not by computer control system 9
With the oxygen concentration of position；
S5, computer control system 9 coal spontaneous combustion is determined according to heating temperature and oxygen concentration needed for temperature and oxygen
Concentration.
The ventilation quantity of the mouth 8 that leaks out in step S4 is same by the control solenoid valve unlatching air pump of computer control system 9
When the ventilation quantity of the mouth 8 that leaks out is calculated according to the flowmeter on admission line.
Application method and working principle: a kind of coal spontaneous combustion oxygen concentration experiment test device of the present invention selects heat-resisting material
It is designed, has many advantages, such as that quick, efficient, accuracy is high and monitors in real time.
The temperature in furnace can be effectively controlled by above-mentioned temperature inspection and control system and prevents temperature from spreading, from
And achieve the purpose that reduce temperature losses with the reasonability of guarantee test data, it can lead to after being packed into test coal sample and being tested
The instrument of excess temperature control device obtains testing required data manipulation conveniently.
The variation feelings of the oxygen concentration in each gas detection hole are effectively monitored by oxygen laser spectrum detection device 13
Condition, to obtain the regularity of distribution of the oxygen concentration field in spontaneous combustion of coal seam.
The method that the present invention utilizes the oxygen concentration field distribution of laser testing coal-field fire, test are leaked out item in semiclosed complexity
Under part, underground coal fire oxygen concentration and its distribution characteristics are capable of providing the movement law of oxygen concentration field in case of spontaneous ignition of the coal.
Can be to the analog study of the oxygen concentration field distribution rule in the case of spontaneous combustion of coal seam by this experimental provision, it can be to mine
Well spontaneous combustion of coal seam situation provides accurately guidance, to effectively reduce the loss of coal bed fire bring and influence.
Coal spontaneous combustion oxygen concentration experiment test device of the invention selects heat-resisting material to be designed, and has quick, high
The advantages that effect, accuracy height and real time monitoring.1. can effectively control furnace by above-mentioned temperature inspection and control system
Interior temperature simultaneously prevents temperature from spreading, to achieve the purpose that reduce temperature losses with the reasonability of guarantee test data, is filling
Entering to test can obtain testing by the instrument of temperature control equipment required data manipulation conveniently after coal sample is tested；2. passing through
Oxygen laser spectrum detection device effectively monitors the situation of change of each gas detection hole oxygen concentration, to obtain in coal seam
The regularity of distribution of oxygen concentration field under auto-ignition；3. by adjust different location the mouth that leaks out, using above-mentioned gas acquisition with
Analysis system selects different position to carry out gas collecting and analysis, and then studies difference and leak out position to the shadow in temperature field
It rings；4. adding Hydraulic Experimental Platform bracket below furnace body, left and right ends can control respectively, to change the angle of experimental bench, with mould
Coal body spontaneous combustion development trend under quasi- different coal occurrence status；5. coal capacity needed for this experimental provision is about 0.367 ton, coal is used
Measure relatively fewer, the test period is short, can largely reduce experimental cost and improve the precision of experimental data.
Coal spontaneous combustion oxygen concentration experiment test device of the invention has quick, efficient, accuracy height and real time monitoring
The advantages of.It can effectively be monitored by the gas collecting point and temperature monitoring point of each layer arrangement different in the case where coal spontaneous combustion
It is dense effectively to monitor oxygen by oxygen laser spectrum detection device for the movement law in position gas situation of change and temperature field
The situation of change of degree, to obtain the regularity of distribution of the oxygen concentration field in spontaneous combustion of coal seam；Pass through leaking out for different location
Mouth changes ventilation quantity, and then studies difference and leak out position to temperature profile effect；This experimental provision coal consumption is relatively fewer, test
Period is short, can largely reduce experimental cost and improve the precision of experimental data.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (10)
1. a kind of coal spontaneous combustion oxygen concentration experiment test device characterized by comprising furnace body (1), on the side wall of furnace body (1)
It is uniformly provided with multiple first through hole (6), multiple second through-holes (7) and multiple mouths that leak out (8), is equipped with multiple ceramics in furnace body (1)
Heating rod (3), multiple rod irons (4), multiple temperature sensors (10) and multiple gas collecting copper pipes (11), multiple ceramic heating bars
(3) it corresponds by the way that in multiple first through hole (6) insertion furnace body (1), multiple rod irons (4) correspond logical by multiple second
Hole (7) is inserted into furnace body (1), and multiple rod irons (4) are being respectively and fixedly provided with gas collecting copper pipe (11) close to furnace body center position,
Be respectively and fixedly provided with temperature sensor (10) at the furnace wall, multiple ceramic heating bars (3) and multiple rod irons (4) according to east, south, west,
Northern four azimuth crossings are arranged in furnace body (1), and the spacing between two neighbouring ceramic heating bars (3) is 150mm, furnace
Body (1) is equipped with temperature control equipment (2), furnace body (1) is externally provided with gas absorption cell (12), oxygen laser spectrum detection device
(13), data collecting card (14) and computer control system (9), multiple ceramic heating bars (3) and multiple temperature sensors (10)
It is connect respectively with temperature control equipment (2), multiple gas collecting copper pipes (11) are connected with gas absorption cell (12), oxygen laser
Spectrum detection device (13) face gas absorption cell (12) setting, temperature control equipment (2) are connect with data collecting card (14), number
It is connect respectively with computer control system (9) according to capture card (14) and oxygen laser spectrum detection device (13).
2. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that multiple mouths that leak out (8) point
Air pump is not connected by admission line, air pump is equipped with solenoid valve, is equipped with flowmeter, flowmeter and number on admission line
It is connected according to capture card (14), solenoid valve and computer control system (9) connection.
3. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the bottom of the furnace body (1)
Portion is equipped with multiple hydraulic supports (5), and multiple hydraulic supports (5) are uniformly arranged on the circumferential edge of furnace body (1) bottom.
4. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the ceramic heating bar
It (3) is 24, rod iron (4) is 48, and temperature sensor (10) is 48, and gas collecting copper pipe (11) is 48, the mouth that leaks out (8)
It is 100.
5. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the oxygen laser spectrum
Detection device (9) include: signal generator, laser driver, Distributed Feedback Laser, optical fiber collimator, gas absorption cell, with preposition
Photodetector, the lock-in amplifier of amplifier, laser driver and lock-in amplifier are connect with signal generator respectively, laser
Driver, Distributed Feedback Laser and optical fiber collimator are sequentially connected, gas absorption cell face optical fiber collimator and with preamplifier
Photodetector setting, photodetector, lock-in amplifier and computer control system with preamplifier are sequentially connected, and are believed
Number generator generates a signal being superimposed by low frequency sawtooth signal with high frequency sinusoidal signal, low frequency sawtooth modulated signal use
Slowly to scan the absorption peak of oxygen；High frequency sinusoidal signal is to generate harmonic signal, by laser driver and Distributed Feedback Laser
After convert electrical signals to laser sending, laser is incident in the gas absorption cell filled with oxygen after optical fiber collimator, then
Line focus lens are injected in the photodetector with preamplifier；Photodetector with preamplifier is by gas suction
Faint optical signal after receives pond is sent to lock-in amplifier after being converted into ultra-weak electronic signal, and lock-in amplifier extracts ultra-weak electronic signal
Harmonic detecting is carried out, the second harmonic signal that lock-in amplifier will test out is transmitted to computer control system, computer control
System (9) is finally inversed by oxygen concentration according to Lambert-Beer's law.
6. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the gas absorption cell
(12) be equipped in: spherical surface object lens B, spherical surface object lens C, spherical surface field lens M, incident deflecting mirror and outgoing deflecting mirror, incident deflecting mirror and
Outgoing deflecting mirror is respectively positioned at the edge of field lens M, and the distance and field lens M of field lens M to object lens B is impartial to the distance between object lens C
In the radius of curvature R of field lens M, the center of curvature CC [M] of field lens M is located at the intersection of object lens B and object lens C, in the curvature of object lens B
The heart is located at point CC [B] on field lens M, and the center of curvature of object lens C is located at point CC [C] on field lens M, the center of curvature CC [B] of object lens B and
Center of curvature CC [C] being equidistant to field lens M central point of object lens C.
7. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the multiple temperature sensing
Device (10) is K-type thermocouple temperature sensor.
8. coal spontaneous combustion oxygen concentration experiment test device as described in claim 1, which is characterized in that the furnace body (1) includes
Internal layer, middle layer and outer layer, internal layer be equipped with refractory brick, middle layer be equipped with insulating layer, insulating layer select aerogel material be made, outer layer by
Carbon steel material is made.
9. the experiment test side of the coal spontaneous combustion oxygen concentration experiment test device as described in claim 1-8 any claim
Method, which comprises the following steps:
S1, the distributional analysis that coal sample partial size will be carried out after coal sample reduction by jaw crusher；
S2, particle diameter distribution is analyzed after coal sample put into furnace body (1) in；
S3, multiple ceramic heating bars (3) are inserted into coal sample by multiple first through hole (6), are controlled by temperature control equipment (2)
The ceramic heating bar (3) of different location processed carries out heat temperature raising to coal sample, and multiple rod irons (4) are passed through multiple second through-holes (7)
It is inserted into furnace body (1), the temperature of different location is monitored in real time by multiple temperature sensors (10), the temperature of different location
Degree situation of change is transmitted to computer control system (9) by data collecting card (14) and is analyzed；
S4, change the ventilation quantity in furnace body (1) by the mouth that leaks out (8), passed through using oxygen laser spectrum detection device (9) detection
Gas collecting copper pipe (11) enters the oxygen in the furnace gas of gas absorption cell (12), and passes through computer control system (9)
It is finally inversed by the oxygen concentration of different location；
S5, computer control system (9) coal spontaneous combustion is determined according to heating temperature and oxygen concentration needed for temperature and oxygen it is dense
Degree.
10. the experimental test procedures of coal spontaneous combustion oxygen concentration experiment test device as claimed in claim 9, which is characterized in that
The ventilation quantity of the mouth that leaks out (8) in step S4 is to control solenoid valve by computer control system (9) to open air pump root simultaneously
The ventilation quantity of the mouth that leaks out (8) is calculated according to the flowmeter on admission line.
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