A kind of test spontaneous combustion of coal ignition small-sized analogue means of phase
Technical field
The present invention relates to the small-sized analogue means of a kind of comprehensive coal face goaf and tunnel loose coal spontaneous combustion ignition, realizes the experimental simulation of spontaneous combustion of coal overall process, has solved judgement and the forecasting problem of spontaneous combustion of coal condition, place and the time under the physical condition.
Background technology
In the prior art; The analogue means that two kinds of test spontaneous combustion of coal phases are arranged; Its principle is basic identical: the air supply system of forming with air compressor and air supply pipe is to coal sample reaction vessel air feed; Make coal and airborne oxygen generation coal oxygen recombination reaction, emit heat and then intensification gradually, reach spontaneous combustion at last.Temperature to coal reaction in the experimentation is carried out the overall process collection, to the CH that discharges in the overall process
4, CO
2, gas such as CO analyzes.The prior art key is to adopt the temperature protection system that spontaneous combustion of coal is heated up to carry out temperature protection; Promptly adopt temperature control equipment to follow the tracks of the temperature in the coal reaction container; And in view of the above the temperature protection medium is heated, medium is equated with the coal reaction vessel temp, thereby realize temperature protection.Present technology has two kinds of temperature protection systems: bath temperature protection system and temperature programme oven temperature, degree protection system.Bath temperature protection system water is as the temperature protection medium, and the disadvantage of this medium is that medium maximum temperature (100 ℃) is low excessively, can not satisfy the required temperature more than 300 ℃ of spontaneous combustion of coal; Temperature programme oven temperature, degree protection system adopts air as the temperature protection medium, and the shortcoming of this medium is can produce heat flow when being heated, and it is inhomogeneous to cause conducting heat.
Summary of the invention
In order to address the above problem; The purpose of this invention is to provide a kind of in order to generation, development, the change procedure of grasping coal spontaneous combustion and the cooling rule after stopping oxygen supply; Its experimental precision is high, and the simulation similarity is good, the test spontaneous combustion of coal ignition small-sized analogue means of phase that result of use is good.
Wherein the hypergolic reaction stove is the container of coal sample hypergolic reaction, is double-layer nested device.Coal sample is placed in two reacting furnaces, through air supply, makes coal generation physisorption, chemisorption and chemical reaction, and then the coal temperature is risen gradually, reach spontaneous combustion at last.Temperature acquisition system is through temperature collecting device and transmission, analysis software, reaches the system of temperature data in the real-time monitoring storage reaction device.Temperature-compensated system is to realize that through temperature controller and sand-bath device hypergolic reaction stove inside and outside temperature difference is zero system.Air supply system is that reaction is carried out indispensable for experiment provides hypergolic reaction necessary oxygen.Gas analysis system is to carry out the real-time and effective analysis through the gas that gas is collected and stratographic analysis reaches the experiment generation, judges the purpose of the degree of spontaneous combustion of coal reaction.
Technical scheme of the present invention is: a kind of test spontaneous combustion of coal ignition small-sized analogue means of phase, and this analogue means is made up of hypergolic reaction stove, temperature acquisition system, temperature-compensated system, air supply system and gas analysis system;
Said hypergolic reaction stove is made up of outside stove and inner furnace; Said outside stove is made up of body of heater II and outside stove blind flange; Be provided with outside stove iron net in the said body of heater II; The below of one wing furnace wall is provided with outside stove air inlet valve, and top, the right side of opposite side furnace wall is provided with the outside stove valve of giving vent to anger, and is provided with sheet asbestos between said body of heater II and the said outside stove blind flange; Said inner furnace is made up of body of heater I and inner furnace blind flange; Be provided with inner furnace iron net in the said body of heater I; The bottom of said body of heater I is provided with inner furnace air inlet valve, and said inner furnace blind flange is provided with the inner furnace valve of giving vent to anger, and is provided with O-ring seal between said body of heater I and the inner furnace blind flange;
Said temperature acquisition system comprises that inner furnace temperature sensor, outside furnace temperature sensor, sand-bath temperature sensor and temperature data acquisition device constitute;
Said temperature-compensated system comprises sand-bath device, inner furnace draft tube, outside stove draft tube and temperature controller;
Said air supply system comprises gas meter and Air compressing bottle;
Said gas analysis system comprises chromatograph and PC;
Wherein, Said inner furnace is nested in the said outside stove; Said outside stove places in the said sand-bath device; Said Air compressing bottle is connected with outside stove air inlet valve with said inner furnace air inlet valve respectively with the inner furnace draft tube through said outside stove draft tube, and the said outside stove valve of giving vent to anger is connected with said chromatograph through outside furnace outlet duct, and the said inner furnace valve of giving vent to anger passes through the inner furnace escape pipe and is connected with said chromatograph; Said inner furnace temperature sensor places the inner lead that passes through of said inner furnace to be connected with said temperature data acquisition device; Said outside furnace temperature sensor places said outside furnace interior through lead and said temperature controller control linkage; Said chromatograph is connected with said PC data with said temperature data acquisition device, and said sand-bath temperature sensor places said sand-bath device inner through lead and said temperature controller control linkage; Said chromatograph is connected with said PC data with said temperature data acquisition device.
Further, said outside stove draft tube and inner furnace draft tube are provided with the gas meter that is used to measure.
The invention has the beneficial effects as follows:
1, electricity consumption sand-bath is protected the temperature of outside stove.The sand-bath temperature is regulated by automatic temp controller, and automatic temp controller can be followed the tracks of outside stove coal sample temperature, makes sand-bath temperature and outside furnace temperature be consistent, and then realizes outside stove body temperature protection.
2, the temperature of the double-layer nested unit protection inner furnace of coal sample reacting furnace.The double-layer nested device of so-called reacting furnace is with being placed on the less coal sample reacting furnace (inner furnace) of build the bigger reacting furnace of build (outside stove) the inside.Two reacting furnaces are all put into the fresh coal sample of same size, the place of production, granularity, and make them begin bubbling air simultaneously, let them begin reaction simultaneously.Like this, the coal sample reaction process in outside stove and the inner furnace is identical, and promptly the temperature of inner furnace and outside stove keeps identical in real time, and the inner furnace inside and outside does not have temperature difference so, has so just realized the temperature protection of inner body of heater.So first kind of temperature protection measure realized the temperature protection of sand-bath to outside stove, second kind of temperature protection measure realized the temperature protection of outside stove for inner furnace.These two kinds of temperature protection measures have just formed inner stove body temperature protection dual fail-safe.Because we only measure the coal reaction in the inner furnace, therefore, through these two kinds of temperature protection, the temperature protection effect of this device inner furnace is very good.The air-flow cushion is all arranged at top, bottom at two-layer body of heater, makes air-flow from bottom to top evenly through the experiment coal body, and experimental gas is through the preheating of coal sample in battle field in the sand-bath and the outside stove, and temperature is identical with the coal temperature of inner body of heater, sends into from bottom of furnace body then.
Description of drawings
Fig. 1 tests the structural representation of spontaneous combustion of coal ignition small-sized analogue means of phase for the present invention.
Fig. 2 is the cross-sectional schematic of sand-bath device of the present invention.
Fig. 3 is a natural reaction furnace structure synoptic diagram of the present invention.
Among the figure:
1, outside stove, 2, inner furnace, 3, the body of heater II, 4, outside stove blind flange, 5, outside stove iron net; 6, outside stove air inlet valve, 7, the outside stove valve of giving vent to anger, 8, sheet asbestos, 9, the body of heater I, 10, the inner furnace blind flange; 11, inner furnace iron net, 12, inner furnace air inlet valve, 13, the inner furnace valve of giving vent to anger, 14, O-ring seal, 15 inner furnace temperature sensors; 16, outside furnace temperature sensor, 17, the sand-bath temperature sensor, 18, the temperature data acquisition device, 19, the sand-bath device, 20, the inner furnace draft tube; 21, outside stove draft tube, 22, temperature controller, 23, gas meter, 24, Air compressing bottle; 25, chromatograph, 26, PC, 27, outside furnace outlet duct, 28, the inner furnace escape pipe.
Embodiment
Below in conjunction with figure technical scheme of the present invention is explained further details.
Like Fig. 1, Fig. 2, shown in Figure 3, the present invention tests spontaneous combustion of coal ignition small-sized analogue means of phase, and this analogue means is by outside stove 1, inner furnace 2, body of heater II 3; Outside stove blind flange 4, outside stove iron net 5, outside stove air inlet valve 6, the outside stove valve 7 of giving vent to anger, sheet asbestos 8; Body of heater I 9, inner furnace blind flange 10, inner furnace iron net 11, inner furnace air inlet valve 12, the inner furnace valve 13 of giving vent to anger; O-ring seal 14, inner furnace temperature sensor 15, outside furnace temperature sensor 16, sand-bath temperature sensor 17, temperature data acquisition device 18; Sand-bath device 19, inner furnace draft tube 20, outside stove draft tube 21, temperature controller 22, gas meter 23; Air compressing bottle 24, chromatograph 25, PC 26, outside furnace outlet duct 27 constitutes with inner furnace escape pipe 28;
Wherein, Inner furnace 2 comprises body of heater I 9 and inner furnace blind flange 10, is provided with inner furnace iron net 11 in the body of heater I 9, and the bottom is provided with inner furnace air inlet valve 7; Inner furnace blind flange 10 is provided with the inner furnace valve 13 of giving vent to anger, and is provided with O-ring seal 14 sealings between body of heater I 9 and the inner furnace blind flange 10; Outside stove 1 comprises body of heater II 3 and outside stove blind flange 4, is provided with outside stove iron net 11 in the body of heater II 3, and the below, left side of body of heater II 3 is provided with outside stove air inlet valve 12, and the top, right side is provided with the outside stove valve 13 of giving vent to anger; Be provided with high density sheet asbestos 8 between body of heater II 3 and the outside stove blind flange 4; Inner furnace 2 is nested in the outside stove 1; Outside stove 1 places in the sand-bath device 19; Air compressing bottle 24 is connected with outside stove air inlet valve 6 with inner furnace air inlet valve 12 respectively with inner furnace draft tube 20 through outside stove draft tube 21; Outside stove draft tube 6 is provided with gas meter 23 with inner furnace draft tube 12, and the outside stove valve 7 of giving vent to anger is connected with chromatograph 25 through outside furnace outlet duct 27, and the inner furnace valve 13 of giving vent to anger passes through inner furnace escape pipe 27 and is connected with chromatograph 25; Inner furnace temperature sensor 15 places the said inner furnace 2 inner leads that pass through to be connected with temperature data acquisition device 18; Outside furnace temperature sensor 16 places outside stove 1 inner lead and temperature controller 22 control linkages passed through; Sand-bath temperature sensor 19 places sand-bath device 19 inner through lead and temperature controller 22 control linkages, and chromatograph 25 is connected with PC 26 data with temperature data acquisition device 18.
Principle of work:
1, the coal crusher that will newly gather to granularity is carried out classification then less than 10mm, carries out proportioning in proportion.Coal sample below the 1mm accounts for 35%, and the coal sample between 1mm and 2mm accounts for 20%, and the coal sample between 2mm and 4mm accounts for 25%, and what 4mm was above accounts for 20%, and coal sample is fully mixed.
2, the coal sample that mixes being got 1kg puts in the inner furnace 2; 15kg is put in the outside stove 1; Inner furnace 2 is put in the outside stove 1, then by outside stove 1 (wherein this moment will) is put in the sand-bath 19, two air storage bottle 24 is connected with outside stove 1 with inner furnace 5 respectively with outside stove draft tube 21 through inner furnace draft tube 20 then; Simultaneously inner furnace temperature sensor 15, outside furnace temperature sensor 16 and sand-bath temperature sensor 17 are placed on inner furnace 2 respectively; In outside stove 1 and the sand-bath 19, and they are linked to each other with the temperature controller 22 of outside with lead, during with test experience whether under identical temperature conditions.Outside sand-bath 19 ones, chromatograph 25, PC 26 and data acquisition unit 18 are connected, and with outside furnace outlet duct 27, inner furnace escape pipe 28 couples together the give vent to anger valve 7,13 of chromatograph 25 with inner furnace 2, outside stove 1, carries out gas analysis.
3, after instrument connects fully, carry out air tight test, after the assay was approved; Connect the sand-bath power supply; Open Temperature sampler power supply, start-up temperature acquisition software, open temperature controller, the control inner furnace infeeds the air that flow is 40 ml/min; Outside stove infeeds the air of 600ml/min, and experiment promptly begins to start.
After the energized, coal sample in the spontaneous combustion temperature-rise period, in inside and outside two reacting furnaces temperature and all gases concentration all in time, wind supply quantity and radiating condition and change.Follow the tracks of coal body temperature variations in the stove by automatic temperature control system, the temperature difference of regulating sand-bath and outer reaction stove is 0.1 ℃.When reaching uniform temperature; Coal sample in inner furnace and the outside stove begins oxidation slowly and produces gas; With temperature variation in the Temperature sampler continuous monitoring coal body; And 10 ℃ of exhaust 0.5L that collect inner furnace of every intensification feed gas chromatograph and detect the variation that coal sample produces gas under the differential responses temperature, and record.