CN201607437U - Analog simulation device for spontaneous combustion of float coal of goaf of coal mine - Google Patents
Analog simulation device for spontaneous combustion of float coal of goaf of coal mine Download PDFInfo
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- CN201607437U CN201607437U CN2009202396722U CN200920239672U CN201607437U CN 201607437 U CN201607437 U CN 201607437U CN 2009202396722 U CN2009202396722 U CN 2009202396722U CN 200920239672 U CN200920239672 U CN 200920239672U CN 201607437 U CN201607437 U CN 201607437U
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Abstract
The utility model discloses an analog simulation device for the spontaneous combustion of the float coal of a goaf of a coal mine. The analog simulation device comprises an analog furnace body, a pressure control device, a gas sample detection system and a control system, wherein the analog furnace body simulates the following environmental conditions of the natural combustion of the goaf of the coal mine in an analog way under the assistance of a pressure retention device: the condition (the space of the goaf is divided into a gangue zone, a mixing zone and a float coal zone from top to bottom) of the float coal of the goaf and the distribution of the pressure of the mine, the control system controls the temperature, the air supply and the air humidity of the analog furnace body, and then the gas temperature, the gas class and the concentration in the analog furnace body are detected and analyzed by the gas sample detection system. The utility model simulates the development condition of the spontaneous combustion of the residual coal of the goaf really and realizes the experimental reproduction of a complicated environmental condition by using smaller expense and cost.
Description
Technical field
The utility model relates to a kind of analogue simulation device, especially a kind of coal mine gob float coal spontaneous combustion analogue simulation device.
Background technology
The spontaneous combustion that coal mine gob is lost coal is a very complicated process, and its influence factor is numerous.The spontaneous combustion that coal is lost in the goaf is not only relevant with natural essence characteristics such as the metamorphic grade of coal self, oxidation heat liberation characteristic, keto consumpting speeds, and the spatial characters such as distribution of also distribute with granularity, the voidage in goaf, leakage intensity, the float coal thickness of float coal, the ore deposit being pressed in the locus of float coal in the goaf, goaf are relevant.
The actual conditions of float coal spontaneous combustion are in the goaf: a large amount of loose coals are accepted the oxygen supply of leaking out simultaneously, and oxidation heat liberation takes place together.In heat-radiation belt, the coal body radiating condition is good, and the heat that the coal body spontaneous combustion produces is leaked out to be taken away, and is difficult for causing heat accumulation, does not possess the needed heat of the further oxidation of coal body, and the low-temperature oxidation of coal can only maintain lower degree, therefore, spontaneous combustion can not take place.
In the possibility self-sustaining combustion zone, because coal body constantly consumes oxygen, the oxygen that leaks out in distinguished and admirable decreases, but still is higher than the lower limit oxygen concentration of coal spontaneous combustion, and oxidation reaction can normally be carried out, and the heat that oxidation reaction produces is difficult for being pulled away, make the oxidation reaction of coal can continue development, the chemical reaction aggravation, the heat of generation increases, the coal body temperature constantly raises, and finally causes the spontaneous fire of coal.
In the band that suffocates, distinguished and admirable when the source of leaking out is penetrated into this district, inleakage very little and distinguished and admirable in oxygen concentration very low, the oxidation rate of coal self slows down, the heat of generation seldom is not enough to keep the continuation oxidation of coal, spontaneous fire can not take place.Therefore, want to simulate the spontaneous combustion development that coal is lost in the goaf truly, should create the accumulation of heat environment and the condition of leaking out similar with the goaf actual conditions.
Therefore, study the spontaneous fire process and the state in goaf, must there be the goaf float coal spontaneous combustion analogue simulation device of a kind of energy real simulation goaf accumulation of heat condition and the state that leaks out to disclose goaf float coal spontaneous fire rule, for the anti-fire-fighting work of colliery scene provides theoretical direction.
Summary of the invention
In view of this, the utility model is devoted to better to simulate truly the spontaneous combustion development that coal is lost in the goaf, has proposed a kind of coal mine gob float coal spontaneous combustion analogue simulation device.
The utility model solves this technical problem the technical scheme that is adopted:
A kind of coal mine gob float coal spontaneous combustion analogue simulation device comprises emulation body of heater, pressurizer, gas sample detection system and control system;
Wherein, described emulation body of heater is in the auxiliary spontaneous fire environmental baseline of analogue simulation coal mine gob float coal down of pressurizer, pressure apparatus is the ore deposit press strip spare in simulation goaf, control system is controlled emulation stove body temperature, air feed and wind-warm syndrome, by gas sample detection system the gas temperature in the emulation body of heater, gas classification and concentration is detected and analyzes then.
The body of heater of above-mentioned emulation body of heater divides inside and outside two-layer, and internal layer stores coal sample, and skin is a heat-insulation layer, separates fully with asbestos between the ectonexine.
Above-mentioned emulation body of heater is a rectangle.
Above-mentioned emulation body of heater is arranged 5 row monitoring points in the horizontal direction, 4 measuring points of every row of horizontal direction, respectively apart from the distance of inlet side rib be 15,45,75,105cm; And/or
4 measuring points on the vertical direction, apart from the distance of bottom be 20,40,70,90cm, every row totally 16 measuring points; And/or
The air inlet of emulation body of heater and air outlet are respectively established a temperature monitoring point.
Above-mentioned pressurizer adopts the automatic hydraulic mode, reach keep-up pressure after the pressure requirement constant.
The sample lines that above-mentioned emulation upper of furnace body is drawn directly links to each other with the automatic sample handling system of gas sample detection system, analyzes the gas concentration on each road by the switching of battery valve.
Above-mentioned control system also comprises the wind-warm syndrome control system, when the emulation body of heater advance/when the temperature of return surpasses 2 ℃, control system can start the heating arrangement of emulation body of heater, improve the temperature of air feed air, and increasing wind supply quantity, reduce the loss of heat in the emulation body of heater, make the emulation body of heater be in adiabatic condition.
The beneficial effects of the utility model are:
The utility model provides a kind of coal mine gob float coal spontaneous combustion analogue simulation device, based on the float coal distribution in space, goaf under the physical condition, the state that leaks out, pressure distribution, create and help keeping environment and the accumulation of heat environment that loose coal heats up by the autoxidation heat release at normal temperatures most, generation, evolution that the research coal spontaneous is got angry, investigate that space, goaf float coal distributes, pressure distribution is to the influence of spontaneous fire, seek to combine to put the goaf and lose the rule that coal spontaneous is got angry.
Description of drawings
Below with reference to accompanying drawings specific embodiments of the present utility model is described in detail, wherein:
Fig. 1 is an emulation furnace binding synoptic diagram of the present utility model;
Fig. 2 is an air feed system synoptic diagram of the present utility model;
Fig. 3 is the 14th day of the present utility model float coal band temperature variation numerical analysis figure;
Fig. 4 is the 14th day of the present utility model mixed zone temperature variation numerical analysis figure;
Fig. 5 is oxygen concentration of the present utility model and pressure dependence synoptic diagram; And
Fig. 6 is the 39th day of the present utility model oxygen concentration space distribution synoptic diagram.
Embodiment
In order to simulate the spontaneous combustion development that coal is lost in the goaf truly, the utility model provides a kind of coal mine gob float coal spontaneous combustion analogue simulation device.Next specify this novel simulated analogue means.At first, the analogue simulation principle is described.
One, analogue simulation principle
The comprehensive goaf of putting under the physical condition varies.From geometric configuration, comprehensive coal face length difference, the width in goaf does not wait from 70-80m to 300m, and the length in goaf constantly changes with the propelling of comprehensive coal face; From geologic condition, also difference is very big for conditions such as thickness of coal seam, roof and floor lithology, direct top thickness degree, buried depth; From the comprehensive coal face draft type, there are the ventilation of " U " type, " Y " type to ventilate and other draft types, the air distribution amount of workplace is from 600-700m
3/ min is to 2000m
3Do not wait about/min, cause leak out form and the leakage intensity in goaf widely different.Simultaneously, even if to same workplace, the state that will simulate its goaf fully is also very difficult, for example, ore deposit, the prosperous village 4326 comprehensive coal faces, erecting dense individual props band height is about 16.5m, wherein: float coal thickness is about 1.6m, and coal and spoil mixed zone thickness are about 1m, waste pack thickness is about 14m, by the similar principle of physical dimension, when ratio was 1: 5, the thickness of float coal band was at 0.3m, do not possess the requirement of coal spontaneous ignition to minimum float coal thickness, can spontaneous fire, test nonsensically, repeatedly high temperature dot appearred and actual conditions are 4326 workplaces goafs in progradation.Simultaneously, the height of testing table will reach 3.5m, is difficult to accomplish in the laboratory.Therefore, simple geometric is similar can not react actual situation.So this experiment is lost the coal spontaneous combustion environment to the goaf under the physical condition and has been done following processing rationally:
1) shape of test unit
Goaf under the physical condition is after entering fully the stage of adopting, and it is shaped as rectangle, and testing table also is designed to rectangle, and the goaf degree of depth (apart from the length of workplace) is represented on the long limit of rectangle, and minor face is represented the width (tilt length of workplace) in goaf.The physical length of fully mechanized coal face is generally at 120-200m, and on-the-spot ore deposit presses observed result to show, the goaf will be compacted after 7-8 periodic weighting step pitch of experience, and compacting zone is generally 150-200m apart from the distance of workplace.According to length breadth ratio: the testing table length and width are proper at 1.2-2m and 1.5-2m respectively.In height, from helping the environment of float coal heat build-up, the float coal band is decided to be 0.5m, mixed zone be about the float coal band half be decided to be 0.3m, because of waste pack does not have coal,, consider the volume of testing table although its actual (real) thickness is very big, with its THICKNESS CONTROL at 0.3m.
According to experiment purpose, in conjunction with the accumulation of heat condition in goaf under the physical condition, it is more reasonable that the dead size of testing table length is decided to be 1.2m * 1.8m * 1.1m.
2) air supply mode
The present most comprehensive coal face especially comprehensive coal face of low gaseous mine all adopts " U " type to ventilate, simultaneously, leaking out of its rear portion of comprehensive coal face that " U " type of employing ventilates is the simplest, be to leak out in " source " " remittance ", leaking out of inside, goaf self is just very complicated, as test and consider one " source " many " remittances " or many " sources " many " remittances ", will be difficult to reach the purpose of experiment, and the restriction of the condition that is put to the test also is difficult to reach the experiment effect of expection.Therefore, the mode of leaking out in " source " " remittance " is adopted in test, i.e. air inlet, an air outlet.
3) accumulation of heat environment
Influence testing table accumulation of heat factor of environmental and mainly contain three: the one, leakage intensity; The 2nd, the voidage of float coal and spoil; The 3rd, the heat-insulating property of test unit.For shortening the process of experiment, should create the condition that helps the coal body spontaneous combustion most.
For this reason, should be in the 0.15-0.24m/min scope at initial stage of experiment with the speed control of leaking out, along with the carrying out of experiment should progressively change wind supply quantity,, satisfy the needs that coal spontaneous combustion heats up to guarantee that sufficient oxygen supply is arranged in the testing table.
For creating good accumulation of heat environment, guarantee preferable float coal granularity.Experimental study shows: varigrained coal, its keto consumpting speed difference.Along with the granularity of coal diminishes, below 45 ℃, its keto consumpting speed is increasing of the order of magnitude, change more than 60 ℃ less relatively; The coal sample of combination grain is along with the rising of temperature, and the keto consumpting speed increase is the fastest, and the oxidation programming rate is the fastest.Therefore, the mixing coal sample of granularity 1-10mm is adopted in test.
For the warranty test body of heater is in adiabatic condition, around body of heater, enrich adiabatic asbestos, and guarantee that by temperature control system the temperature difference of air entering and returning is 2 ℃, when advance, when the return air temperature difference surpasses this value, start heating arrangement and improve EAT, prevent to take away the heat that coal spontaneous combustion heats up and produces, influence the development of coal spontaneous combustion process because of EAT is low excessively.
4) realization of ore deposit pressure
As previously mentioned, the distribution that press in the ore deposit and the voidage in goaf have substantial connection, and the ore deposit is pressed big more, and voidage is more little.The ore deposit in actual goaf presses distribution very complicated, but it is followed more and presses big more rule away from the workplace ore deposit, is the short form test condition, considers experiment feasibility, employing realizes under the test condition simulation that distributes being pressed in the ore deposit from testing table subregion pressing mode from front to back.
The purpose of this experiment is mainly investigated the distribution and the dynamic change situation of the temperature in the coal spontaneous combustion process, oxygen concentration and CO concentration on the locus, analyzes float coal space distribution state and ore deposit and presses the influence that distributes to the spontaneous fire process.Simulation is combined and is put the spontaneous fire process that coal is lost in the goaf, discloses the spontaneous fire rule in its space.
Two, analogue simulation device
In order to simulate the spontaneous combustion of coal situation of putting under the physical condition of goaf of combining, developed goaf coal sample spontaneous fire experimental provision specially, goaf coal occurrence status and the accumulation of heat environmental baseline of this device under simulating actual conditions can detect in oxygen distribution, temperature variation and the oxidizing process in the coal sample spontaneous combustion temperature-rise period situations such as gas generation in real time.Experimental provision is divided into five parts such as rectangle testing table, system for detecting temperature, gas sample acquisition detection system, pressure control device, air feed system and forms.
2.1 rectangle testing table
The rectangle testing table is according to the shaped design in goaf, divides inside and outside two-layerly, and interior rectangle is a body of heater, stores coal sample, and outer rectangular is a heat-insulation layer, plays protection and beauty function, separates fully with asbestos layer between the inside and outside rectangle, stops heat transferred.
Fig. 1 illustrates emulation furnace binding synoptic diagram of the present utility model, and as shown in Figure 1,1 is heat insulation layer, and 2 is beam tube, and 3 is temperature sensor lead, and 4 is measuring point, and 5 is nut, and 6 is sealing-plug, and 7 is temp probe.Its important technological parameters is:
1) testing table inside dimension: 180 * 120 * 110cm, physical dimension is 210 * 150 * 145cm.The maximum volume of coalingging is: 2.4m
3, maximum coal capacity is 3.24 tons.
2) monitoring point distributes: on in-plane, arrange 5 row monitoring points, 4 measuring points of every row of horizontal direction, respectively apart from the distance of inlet side rib be 15,45,75,105cm; 4 measuring points on the vertical direction, apart from the distance of bottom be 20,40,70,90cm, every row totally 16 measuring points; Air inlet and air outlet are respectively established a temperature monitoring point.Arrange 82 temperature monitoring points altogether, 40 gas sampling points.
Interior rectangle is a body of heater, its bottom, four sidewalls adopt the thick steel plate of 20mm to be welded, and the top adopts the butt joint of 4 block plates to form, and adopts high temperature resistant colloid sealing between piece and the piece, handle the top so both for the ease of installing and put into coal sample, simultaneously also for the ease of changing pressure.All separate around the body of heater with asbestos layer and outer protection layer, the steel pipe that advance, return air inlet adopts diameter 10cm, direct and body of heater welding for preventing that float coal from stopping up into, return air inlet, is drilled to floral tube at the steel pipe latter end, and collar extension is protected with the finer wire net.
2.2 the set-up mode of point for measuring temperature and gas sample sampled point
Owing to will on coal sample, apply the ore deposit pressure that certain pressure is simulated the goaf, therefore be difficult in temperature and gas sample acquisition point are set in the body of heater.For solving measuring point problem is set, has welded 6 minutes thick walled steel tube of 20 diameters at bottom of furnace body, temperature probe and gas production beam tube are placed in the pipe, do not contact with steel pipe with the thermal insulation material protection around the temperature probe, guarantee that measured temperature is the some temperature of measuring point position.Arrange 4 measuring points in vertical direction along steel pipe, apart from the distance of bottom of furnace body be respectively 20,40,70,90cm, the layer position in pairing simulation goaf is float coal layer, coal and spoil mixolimnion, spoil layer.Survey the stainless-steel tube that the gas beam tube adopts diameter 3mm, adopt resistant to elevated temperatures colloid sealing between each measuring point, prevent to collaborate between each measuring point.
2.3 pressure control
Experiment table top adopts that 4 block plates butt joints, its width are respectively 45,55,45,35cm, after the steel plate punching, passes monitoring point protection steel pipe, and fixes by nut and steel pipe.Along the testing table length direction, pressure distribution is: 0-0.45m pressure is that 0Mpa does not promptly exert pressure, and 0.45-1.0m applies the pressure of 1Mpa, and 1.0-1.45m applies the pressure of 2Mpa, and 1.45-1.8m applies the pressure of 3Mpa.The automatic hydraulic jack device is adopted in pressurization, reach the pressure requirement after, the nut on the fastening protection steel pipe, it is constant to keep-up pressure.
2.4 gas sample detection system
The sample lines of drawing from upper of furnace body directly links to each other with the automatic sample handling system of gas sample detection system, analyzes the gas concentration on each road by the switching of solenoid valve.
Consider that measuring point is too many and closer, gas concentration changes less, and therefore, the gas sample of only getting the part measuring point carries out analytical test.Have CO, CO in the analysis
2, O
2, C
2H
4, C
2H
6Deng.
2.5 control system
Control system comprises temperature detection, temperature control, three parts of air feed control system, and major function changes and control by detected temperatures, realizes the Detection ﹠ Controling to process of the test.
2.5.1 temperature detection
To the temperature variations of real-time each measuring point of detection, dynamically show the temperature distribution state in the testing table, according to the different phase of coal spontaneous combustion development, per 60 minutes records are each measuring point temperature value once.Detection system can be handled data, draws time dependent curve of temperature or conplane temperature variation.
2.5.2 air feed system
Fig. 2 illustrates air feed system synoptic diagram of the present utility model.As shown in Figure 2, air feed system is made up of air compressor, humidifier, constant temperature oven, flow regulator, pipeline.
Air feed system has 2 groups of 4 air compressor, decides the platform number of unlatching according to the size of wind supply quantity, at the test initial stage, one group of compressor of general unlatching under the normal condition, two are carried out cycle operation, and circulation in per two hours helps prolonging serviceable life of compressor like this.
2.5.3 wind-warm syndrome control system
In the process of the test for keeping experimental provision to be in adiabatic condition, when advance, when the temperature of return surpasses 2 ℃, control system can start the heating arrangement of constant temperature oven, improve the temperature of air feed air, and the increasing wind supply quantity, reduce the loss of heat in the body of heater, make body of heater be in adiabatic condition.The control system setting is resolved, and calculating needs the temperature of increase and the numerical value of air quantity automatically, feeds back to air quantity control system and constant temperature oven.The effect of constant temperature oven is that the air that enters body of heater is carried out preheating and carries out voltage stabilizing, and its inside is installed on electrothermal tube.
Three, simulation process and interpretation of result
The spontaneous combustion of goaf float coal depends primarily on two factors: the one, and the oxidation characteristic of coal self is a spontaneous combustion tendency; The 2nd, the accumulation of heat environment in goaf; The hazard level of the degree decision goaf float coal spontaneous fire that both conditions merge.As anti-fire extinguishing, we can't change the intrinsic propesties of coal self, can only start with from the natural environmental condition of eliminating or weaken coal and consider the measure of anti-fire extinguishing.To a certain extent, the environment of research spontaneous combustion of coal has more practical significance than the oxidation characteristic of research coal self, for this reason, the natural environmental condition of goaf float coal is simulated in this test as much as possible, investigate the spontaneous combustion evolution of goaf float coal, seek its natural law, for the anti-fire extinguishing at scene provides technical basis.
3.1 experiment condition
After the testing equipment debugging installs, choose 3 tons of 3 tons of coal samples and balkstones in certain ore deposit, coal sample and spoil are crushed to below the 10mm, adorn the coal sample of 50cm at the foot of body of heater, its top covers the coal of 30cm and the compound sample of spoil, and topmost is the spoil of 30cm.
The initial temperature of experiment is 27 ℃ of room temperatures, and the coal sample particle mean size is Φ 2.7mm.The coal sample general assembly (TW) is 1895kg; Spoil weight is 2430kg; Wind supply quantity is 0.5-6m3/h.
3.2 experimental result
At the test coal sample body of heater of packing into, and after pressurization, sealing, insulation finish, start air compressor machine air feed in body of heater by control system, the beginning simulation test.Because the purpose of this experiment is lost the space spontaneous fire rule of coal for the research goaf, it is the relation of spontaneous combustion state of development, accumulation of heat environment and float coal distribution and coal spontaneous combustion on the locus, goaf, it or not the spontaneous combustion period of simulation coal, therefore, this test stops air feed when the coal maximum temperature reaches 160-170 ℃ in body of heater, finish test.In entire test, the interior coal body maximum temperature of body of heater develops into 166.5 ℃ from 27.2 ℃ and continues 40 days altogether.
For ease of the position and the corresponding relation of temperature of describing each measuring point in the body of heater, be initial point with the air inlet, pointing to the return air inlet direction is x axle positive dirction, sensing body of heater deep direction is a y axle positive dirction, perpendicular to bottom of furnace body upward to being the z direction of principal axis.
3.3 interpretation
According to experimental result, testing table different spaces height (z axle) under the test condition, temperature, oxygen and carbon monoxide distribution situation apart from air inlet different distance (y axle) have been carried out numerical analysis.
1) temperature variations analysis
By experimental result as can be known, slower at the programming rate of the initial stage coal sample of testing, coal sample rises to 70-80 ℃ by 27 ℃ of initial temperatures and lasts 28 days, and average temperature rising is about 1.53-1.89 ℃/d.The coal sample temperature speeds up rising to 70 ℃ of rear oxidations in the testing table, rises to 110-129.8 ℃ by 70-80 ℃ and lasts 7 days, average temperature rising 5.71-7.1 ℃/d.Experiment proceeds to 37 days coal sample maximum temperatures and reaches 145.5 ℃, reaches 166.5 ℃ in the time of the 40th day, and average temperature rising is respectively 7.9 ℃/d, 10.5 ℃/d.In whole coal sample oxidizing process, 3 acceleration points have appearred in oxidation rate, once quicken at 70 ℃ of rear oxidation speed regulations, quicken at 110 ℃ of rear oxidation speed regulation secondaries, quicken for the third time 150 ℃ of rear oxidation speed.This explanation is after coal spontaneous combustion is oxidized to uniform temperature, and oxidation reaction can be aggravated, if the condition matters will soon develop into spontaneous fire.This just requires in real work, in case find the comprehensive coal face goaf spontaneous fire sign is arranged, and should take fire-fighting measure immediately, suppresses the further oxidation and spontaneous combustion of float coal, prevents the generation of spontaneous fire accident.
Fig. 3 illustrates the 14th day of the present utility model float coal band temperature variation numerical analysis figure.As shown in the figure, wherein, float coal band: Z axle height, 0.4m intake: 1.5m3/h; EAT: 53.6 ℃.
Fig. 4 illustrates the 14th day of the present utility model mixed zone temperature variation numerical analysis figure.As shown in the figure, wherein, mixed zone: Z axle height, 0.7m intake: 1.5m3/h; EAT: 53.6 ℃.
By Fig. 3 and Fig. 4 as can be seen, on the different spaces height (z axle), the different stages of development of coal spontaneous combustion oxidation, the oxidation programming rate of coal sample there are differences in the test body of heater.At the initial stage of coal spontaneous combustion (the coal body temperature is lower than 70-80 ℃), the oxidation programming rate of mixed zone is greater than the float coal band.This is owing to make progress along bottom of furnace body, oxygen concentration from high to low, inleakage is also descending, the oxygen concentration of mixed zone is higher than the least concentration of spontaneous fire, and the accumulation of heat environment is better than the float coal band of bottom, and heat is easy to gather, therefore, its oxidation programming rate is a little more than the float coal band of bottom.The heat part that the mixed zone coal spontaneous combustion produces is passed to the waste pack on top, and a part is passed to the float coal band of bottom, and the top oxidation rate of float coal is accelerated.The existence of mixed zone, changed the radiating condition of bottom float coal band, the heat that the float coal band is produced is difficult for being lost to waste pack, aggravated the oxidation reaction on float coal band top, its temperature rise is accelerated, when temperature reaches 70-80 ℃, rising along with float coal band temperature, produce hot dividing potential drop, the heat build-up condition of mixed zone reduces, and the coal amount that contains in the mixed zone is lower than the float coal band of bottom simultaneously, therefore, the temperature on float coal band top surpasses mixed zone, and high temperature dot occurs and is stabilized in float coal band top, and the oxidation rate of mixed zone slows down.
2) pressure and oxygen concentration distribute
From experimental result, along with the increasing of y value, the oxidation rate difference of coal is bigger in the experiment body of heater, in the situation of no external pressure, in the scope of 0-0.45m, though oxygen concentration is higher, but, be difficult for heat build-up, thereby temperature rising amplitude is less because infiltration coefficient is big.In the 0.45-1.45m scope, infiltration coefficient decreases because of the increasing of pressure, and is still better at the oxidation of coal initial stage at first half (y=0.6m place) radiating condition, the temperature rise amplitude is little, at latter half of (y=0.9m place), and oxidation of coal and heat build-up condition the best, therefore, high temperature dot appears at this zone.In the 1.45-1.8m scope, the maximum infiltration coefficient minimum of pressure, fresh distinguished and admirable to air inlet to this zone after, oxygen concentration is very low, therefore, the coal spontaneous combustion degree of oxidation remains on lower level always.
Fig. 5 illustrates oxygen concentration of the present utility model and pressure dependence synoptic diagram; As can be seen from Figure, along with the rising of pressure, oxygen concentration presents the trend that reduces gradually.When first day of experiment, the high pressure district at the testing table rear portion, its oxygen concentration is higher than anterior on the contrary, this is because the test initial stage, when the blocking test platform residual air is arranged, and the testing table rear portion causes voidage little owing to the pressure height, the oxidation rate of coal sample is slow, therefore oxygen concentration is higher, but along with the increase of experiment fate, the residual oxygen expenditure at rear portion totally, and the amount of oxygen that comes by front portion infiltration is very little, therefore, oxygen concentration is lower than front area.Along the y direction of principal axis, along with the rising of pressure, apart from the increasing of air inlet distance, oxygen concentration progressively reduces.
3) oxygen concentration changes in distribution in the process of the test
Distribute from oxygen concentration, at the experiment initial stage, on spatial altitude, to the testing table bottom upwards, oxygen concentration reduces gradually, still, the oxygen concentration in " mixed zone " in the zone of 10-18% the coal sample autoxidation initial stage than " float coal band " more close workplace.This is because big the causing in the osmotic coefficient ratio float coal band in the mixed zone.Figure 19 has reflected the oxygen concentration distribution situation on different spaces height when test proceeds to the 14th day.
Carrying out along with experiment, during by the 39th day, bigger variation has taken place in the oxygen concentration of testing table first half, especially float coal band mid point (z=0.4, the oxygen concentration of y=0.6) locating is far below point (z=0.2, y=0.6), concentration when the oxygen concentration in mixed zone also proceeds to the 14th day far below test, this mainly is that (z=0.4 y=0.6) locates because of maximum temperature point appearance point in the time of the 39th day, the coal sample oxidation rate of this point is fast, and oxygen utilization is big to be caused.The oxygen concentration distribution situation as shown in Figure 6.
In the anti-fire-fighting work of reality, when especially surveying the spontaneous fire position by drilling, if oxygen concentration is very low in the boring, and carbonomonoxide concentration is when simultaneously very high, can conclude that high-temperature area is just near the whole hole point of this boring, should be at this zone complement boring, a large amount of pressure injection colloids or dytory.
Four, analogue simulation experimental summary
Factors such as rock pressure [in mine, float coal granularity, the oxygen supply condition that leaks out, float coal thickness, goaf float coal occurrence status are taken all factors into consideration in the experiment of this analogue simulation, created and the comprehensive similar environmental baseline of goaf float coal spontaneous combustion of putting of reality, spontaneous fire process to the goaf float coal has been carried out test simulation, presses the relation of distribution, float coal distribution that effective laboratory facilities are provided for studying goaf float coal spontaneous combustion and ore deposit, goaf.By simulated experiment, draw as drawing a conclusion:
1) on spatial altitude, the spontaneous combustion evolution dynamic change of coal.At the initial stage of coal spontaneous combustion oxidation, when the coal body temperature was lower than 70-80 ℃, the spontaneous combustion high-temperature area was in " mixed zone ".Along with the development of coal spontaneous combustion oxidation, when the coal body temperature surpassed 70-80 ℃, the spontaneous combustion high temperature dot moved down into " float coal band ".The existence of " mixed zone " has changed the accumulation of heat environment of goaf float coal, at the spontaneous combustion initial stage effect of quickening has been played in the oxidation intensification of float coal band.
2) on spatial altitude, the development degree that coal spontaneous combustion heats up is unbalanced, and in the space that has coal to exist, the position is high more, and high-temperature area is the closer to workplace.
3) on the planimetric position, the coal spontaneous combustion initial stage, high temperature dot appears at the zone of return air inlet postmedian, when the coal body temperature surpasses 70-80 ℃, progressively to the air inlet side shifting, along with the further rising of coal body temperature, keto consumpting speed strengthens, high temperature dot moves to the place of good penetrability, oxygen supply abundance, finally causes spontaneous fire.
4) press in the ore deposit has direct influence to spontaneous fire, and press by influencing the voidage of float coal in the ore deposit, influences the state and the leakage intensity of leaking out, and then influence the oxidation rate of float coal, influences the float coal spontaneous fire.From experimental result, test initial stage high-temperature region is at the y=0.9m place, and the later stage is moved to the y=0.6m place, is in the low stress area, the region of high stress at testing table rear portion, though the float coal occurrence status is the same with the front portion, and not spontaneous combustion substantially.
5) distribute from oxygen concentration, at the initial stage of experiment, on spatial altitude, from the testing table bottom upwards, oxygen concentration reduces gradually, still, the oxygen concentration in " mixed zone " in the zone of 10-18% the coal sample autoxidation initial stage than " float coal band " more close workplace.
6) Research and development of test-bed meets the spontaneous combustion environment in goaf and the requirement of accumulation of heat condition, has reflected the evolution that coal spontaneous combustion heats up, for the spontaneous fire rule of studying the space, goaf provides reliable laboratory facilities.
More than specific descriptions of the present utility model are intended to illustrate the implementation of specific embodiments can not be interpreted as it is to restriction of the present utility model.Those of ordinary skills can make various variants on the basis of the embodiment that describes in detail under instruction of the present utility model, these variants all should be included within the design of the present utility model.The utility model scope required for protection is only limited by described claims.
Claims (8)
1. coal mine gob float coal spontaneous combustion analogue simulation device is characterized in that:
Comprise emulation body of heater, pressurizer, gas sample detection system and control system,
Wherein, described emulation body of heater is in the auxiliary spontaneous fire environmental baseline of analogue simulation coal mine gob float coal down of pressurizer, pressure apparatus is the ore deposit press strip spare in simulation goaf, control system is controlled emulation stove body temperature, air feed and wind-warm syndrome, by gas sample detection system the gas temperature in the emulation body of heater, gas classification and concentration is detected and analyzes then.
2. analogue simulation device as claimed in claim 1 is characterized in that:
The body of heater of described emulation body of heater divides inside and outside two-layer, and internal layer stores coal sample, and skin is a heat-insulation layer, separates fully with asbestos between the ectonexine.
3. analogue simulation device as claimed in claim 2 is characterized in that:
Described emulation body of heater is a rectangle.
4. analogue simulation device as claimed in claim 3 is characterized in that:
Described emulation body of heater is arranged 5 row monitoring points in the horizontal direction, 4 measuring points of every row of horizontal direction, respectively apart from the distance of inlet side rib be 15,45,75,105cm; And/or
4 measuring points on the vertical direction, apart from the distance of bottom be 20,40,70,90cm, every row totally 16 measuring points; And/or
The air inlet of emulation body of heater and air outlet are respectively established a temperature monitoring point.
5. analogue simulation device as claimed in claim 4 is characterized in that:
Described pressurizer adopts the automatic hydraulic mode, reach keep-up pressure after the pressure requirement constant.
6. as each described analogue simulation device of claim 1 to 5, it is characterized in that:
The sample lines that described emulation upper of furnace body is drawn directly links to each other with the automatic sample handling system of gas sample detection system, analyzes the gas concentration on each road by the switching of solenoid valve.
7. analogue simulation device as claimed in claim 6 is characterized in that:
Described control system also comprises air feed system, and this air feed system comprises air compressor, humidifier, constant temperature oven, flow regulator and pipeline.
8. analogue simulation device as claimed in claim 7 is characterized in that:
The coal sample of the foot dress 50cm of described emulation body of heater, its top covers the coal of 30cm and the compound sample of spoil, and topmost is the spoil of 30cm.
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| CN2009202396722U CN201607437U (en) | 2009-10-16 | 2009-10-16 | Analog simulation device for spontaneous combustion of float coal of goaf of coal mine |
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| CN2009202396722U CN201607437U (en) | 2009-10-16 | 2009-10-16 | Analog simulation device for spontaneous combustion of float coal of goaf of coal mine |
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