CN105807029A - Coal spontaneous-combustion characteristic determining device based on thermogravimetry - Google Patents
Coal spontaneous-combustion characteristic determining device based on thermogravimetry Download PDFInfo
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- CN105807029A CN105807029A CN201610338042.5A CN201610338042A CN105807029A CN 105807029 A CN105807029 A CN 105807029A CN 201610338042 A CN201610338042 A CN 201610338042A CN 105807029 A CN105807029 A CN 105807029A
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- 239000003245 coal Substances 0.000 title claims abstract description 215
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 238000002411 thermogravimetry Methods 0.000 title abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910052802 copper Inorganic materials 0.000 claims abstract description 49
- 239000010949 copper Substances 0.000 claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 162
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 230000002269 spontaneous effect Effects 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 32
- 238000007254 oxidation reaction Methods 0.000 abstract description 32
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract 2
- 238000004321 preservation Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 18
- 230000004048 modification Effects 0.000 description 18
- 238000005303 weighing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001012508 Carpiodes cyprinus Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007353 oxidative pyrolysis Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 235000002020 sage Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 208000016261 weight loss Diseases 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/222—Solid fuels, e.g. coal
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a coal spontaneous-combustion characteristic determining device based on a thermogravimetry.The problem of synchronous measurement of an oxidation temperature rise characteristic curve, mass change quantity and gas production/consumption characteristics of a coal sample under temperature raising programming is effectively solved.High-pressure steel cylinders are connected with a preheating copper pipe through a gas premixing device, the preheating copper pipe is arranged in a coal sample tank support, the coal sample tank support extends out of a box body to be arranged on a balance, a cooling copper pipe is arranged in the top, a coal sample tank is arranged in the coal sample tank support, the preheating copper pipe and the cooling copper pipe are connected with a gas inlet and a gas outlet of the coal sample tank, and the cooling copper pipe is connected to a gas chromatograph.A heating layer is arranged outside the box body, electric heating wires are arranged in the heating layer, a heat preservation layer is arranged outside the heating layer, the electric heating wires are connected with a temperature raising programming controller, a temperature is arranged in the coal sample tank and is connected with a coal sample temperature data acquisition card, and the temperature raising programming controller, the coal sample temperature data acquisition card, the balance and the gas chromatograph are connected with a computer.The coal spontaneous-combustion characteristic determining device is high in automation degree, and test results are reliable.
Description
Technical field
The present invention relates to a kind of coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric.
Background technology
Coal is one of China's important energy source, and the nineties in 20th century is maintained at more than 70% so far in China's energy resource structure.But the spontaneous combustion of coal not only causes the loss of coal resources in China, the most also safe working of serious threat coal resources.Thus, it is necessary to the ignition quality of coal is understood in research, builds in Coal Self-ignition Process relation service between parameters in the protection of coal resources in China and exploitation.Use for laboratory has in the capital equipment of the ignition quality of Study on Coal at present: the equipment such as adiabatic oxygenation device, temperature programming device, Fourier infrared spectrograph and thermal analyzer.Wherein temperature programming equipment and thermal analyzer feature are as follows: temperature programming equipment research coal spontaneous combustion characteristic is coal sample to be placed in temperature programming stove, temperature programming stove carries out temperature programming and accelerates the oxidation intensification of coal sample, obtain coal sample oxidation temperature-raising characteristic curve in Temperature Programmed Processes, and the gas component in oxidation of coal temperature-rise period and volume fraction can be obtained with gas chromatograph combination；Thermal analyzer Study on Coal ignition quality is to utilize to make coal sample aoxidize under program temperature control, thus obtains the relation between coal sample quality knots modification and temperature, can obtain coal sample suction/thermal discharge in oxidizing process simultaneously.
But temperature programming equipment cannot obtain coal important parameter of this coal spontaneous combustion characteristic of quality knots modification of coal sample in oxidation temperature-rise period；And the equipment that thermal analyzer is not directed to oxidation of coal characteristic and develops, focused in terms of oxidation of coal research is only coal sample quality knots modification in temperature-rise period, simultaneously, current existing thermal analyzer, in order to take into account hot quantitative analysis, be focused on susceptiveness, is caused analyzed sample quality little, coal sample quality used by test is little, and unit mass coal sample gas production in oxidation temperature-rise period is little, it is impossible to gas component generated in oxidation of coal process and volume fraction are carried out quantitative analysis.And the heat used at present-red through transport technology (thermal analyzer is combined with infrared spectrum) is only capable of being analyzed the functional group of gas.Temperature programming equipment is to cause air flow through that flow through broken coal sample to pile up the space thermal analyzer formed be then that coal sample is in oxidizing atmosphere when testing oxidation of coal temperature-raising characteristic, flows a gas through broken coal body and piles up the space formed and the most more meet the process of the oxidation losing coal in goaf after coal mine work area back production.If using temperature programming and thermal analyzer that coal sample is analyzed respectively, one is to cause, waste time and energy, labor intensity is big, two are, big quality coal sample (temperature programming) and little quality coal sample (thermal analyzer) can not constitute contrast, it is impossible to obtain coal sample quality in temperature-rise period and change the relation between gas generation/consumption.Coal produced gas in oxidizing process temperature-rise period produces just because of coal generation oxidative pyrolysis, and the quality of coal will necessarily change, thus during building oxidation of coal, mass change is most important with the research of oxidation of coal characteristic with the relation pair of coal aerogenesis feature.Therefore, how heat is analyzed quality awareness change this feature of test to be combined with temperature programming equipment, thus obtain coal sample product/gas consumption feature of coal sample under temperature-raising characteristic curve, quality knots modification and different temperatures in oxidation temperature-rise period simultaneously, it is the current problem compeling highly necessary to solve.
Summary of the invention
For above-mentioned situation, for overcoming prior art defect, the purpose of the present invention is just to provide a kind of coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric, can effectively solve oxidation temperature-raising characteristic curve, quality knots modification and the synchro measure problem of product/gas consumption feature of coal sample under temperature programming.
nullThe technical scheme that the present invention solves is，Oxygen pressure steel cylinder is connected with gas pre-mixed device through the first gas circuit pipeline，Nitrogen high-pressure cylinder through the second gas circuit pipeline respectively with the first gas circuit pipeline、Gas pre-mixed device connects，Gas pre-mixed device is connected with air inlet pipe through the first gas piping，Air inlet pipe is connected with preheating copper pipe，Preheating copper pipe is placed in coal sample tank bracket bottom，The casing of temperature programming case is extended downwardly from bottom coal sample tank bracket below preheating copper pipe，It is placed on the pallet of balance，The top of coal sample tank bracket protrudes upward the casing of temperature programming case，The cooling copper pipe of the casing over top being placed in temperature programming case is had in the top of coal sample tank bracket，Equipped with coal sample tank in coal sample tank bracket above preheating copper pipe，Preheating copper pipe is connected with the air inlet of coal sample tank bottom，The gas outlet on coal sample tank top is connected with cooling copper pipe，Cooling copper pipe connects the second gas piping through escape pipe，Second gas piping is connected on gas chromatograph，By gas chromatograph, gone out gas is analyzed，Temperature programming case is by casing、Zone of heating、Heat-insulation layer、Programmed temperature-rising controller、The enclosed construction of composition combined by coal sample temperature data acquisition card and balance，Casing periphery is enclosed with zone of heating，Heating wire is had in zone of heating，Zone of heating outer wrap has heat-insulation layer，Programmed temperature-rising controller outside heating wire and casing connects，The power of the heating wire in programmed temperature-rising controller control zone of heating realizes the intensification of casing，Coal sample tank is built with temperature sensor，The free end of temperature sensor stretches out coal sample tank bracket and is connected with coal sample temperature data acquisition card，Coal sample temperature data acquisition cartoon excess temperature sensor acquisition coal sample temperature，Programmed temperature-rising controller、Coal sample temperature data acquisition card、Balance、Gas chromatograph is all connected with computer.
The oxidation that present invention achieves coal under different oxygen concentrations atmosphere heats up, the change of oxygen concentration in oxidation of coal temperature-rise period；Coal sample quality temperature and measurement of mass change in oxidation of coal temperature-rise period can be realized；Can realize coal gas in oxidation temperature-rise period and generate the mensuration of feature, automaticity of the present invention is high, reliable test result, it is achieved that ature of coal amount knots modification can be measured while heating up by oxidation of coal in real time.
Accompanying drawing explanation
Fig. 1 is the structural front view of the present invention.
Fig. 2 is the structure chart of the carrier of coal sample tank of the present invention.
Fig. 3 is the structure sectional view of the gas pre-mixed device of the present invention.
Fig. 4 is that the A-A of Fig. 3 of the present invention is to sectional view (amplification).
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is elaborated.
nullBe given by Fig. 1-Fig. 4，The structure of the present invention is，Oxygen pressure steel cylinder 1 is connected with gas pre-mixed device 9 through the first gas circuit pipeline a，Nitrogen high-pressure cylinder 5 through the second gas circuit pipeline b respectively with the first gas circuit pipeline a、Gas pre-mixed device 9 connects，Gas pre-mixed device is connected with air inlet pipe 10 through the first gas piping c，Air inlet pipe is connected with preheating copper pipe 11，Preheating copper pipe 11 is placed in coal sample tank bracket bottom，The casing of temperature programming case is extended downwardly from bottom coal sample tank bracket below preheating copper pipe，It is placed on the pallet of balance 18，The top of coal sample tank bracket protrudes upward the casing of temperature programming case，The cooling copper pipe 13 of the casing over top being placed in temperature programming case is had in the top of coal sample tank bracket，Equipped with coal sample tank 12 in coal sample tank bracket above preheating copper pipe，Preheating copper pipe 11 is connected with the air inlet of coal sample tank 12 bottom，The gas outlet on coal sample tank 12 top is connected with cooling copper pipe 13，Cooling copper pipe connects the second gas piping d through escape pipe 14，Second gas piping d is connected on gas chromatograph 15，By gas chromatograph, gone out gas is analyzed，Temperature programming case is by casing 24、Zone of heating 20、Heat-insulation layer 21、Programmed temperature-rising controller 22、The enclosed construction of composition combined by coal sample temperature data acquisition card 23 and balance 18，Casing periphery is enclosed with zone of heating，Heating wire is had in zone of heating，Zone of heating outer wrap has heat-insulation layer，Programmed temperature-rising controller outside heating wire and casing connects，The power of the heating wire in programmed temperature-rising controller control zone of heating realizes the intensification of casing，Coal sample tank is built with temperature sensor 16，The free end of temperature sensor stretches out coal sample tank bracket and is connected with coal sample temperature data acquisition card 23，Coal sample temperature data acquisition cartoon excess temperature sensor 16 samples of coal pulled temperature，Programmed temperature-rising controller、Coal sample temperature data acquisition card、Balance 18、Gas chromatograph is all connected with computer.
It is connected with first air relief valve the 2, first pressure maintaining valve the 3, first gas mass flow controller 4 in turn between described oxygen pressure steel cylinder 1 and the first gas circuit pipeline a；
It is connected with second air relief valve the 6, second pressure maintaining valve the 7, second gas mass flow controller 8 in turn between described nitrogen high-pressure cylinder 5 and the second gas circuit pipeline b；
There is the coal sample tank bracket containment vessel 19 at the casing top being contained in temperature programming case described periphery, coal sample tank bracket upper end, prevents the interference of outer bound pair coal sample tank bracket 17, affects the measurement of quality；
Described temperature programming case is provided with chamber door, is used for opening installation and removal coal sample tank；
The shell structure that described heat-insulation layer 21 is made for glass cotton；
Described coal sample tank bracket 17 is through the position of casing, casing has perforation, ensure that coal sample tank bracket 17 and casing crossover sites have space, not contacting, (support stretches out casing by perforation and is connected with the pallet of balance, being to make support not contact with casing, support only contacts with the pallet of balance.It is at casing top that the top of support is used for supporting cooling copper pipe 13, plays the purpose of cooling gas)；
Described coal sample tank bracket be vertically link together by bottom-up the preheating carrier 26 of copper pipe, coal sample tank carrier 27(as shown in Figure 2) and the integrative-structure that constitutes of carrier 28 of cooling copper pipe, preheat the cross section of carrier of the carrier of copper pipe, the carrier of coal sample tank and copper pipe of lowering the temperature all in equilateral triangle；
The center of described equilateral triangle is that three angles of annulus, annulus and equilateral triangle connect through three supporting sticks respectively；
The coal sample tank fixed mount of equilateral triangle it is embedded with in the middle part of the carrier 27 of described coal sample tank, three Ge Bian centers of coal sample tank fixed mount are equipped with the fixed angles 29 for fixing coal sample tank position, for guaranteeing that each coal sample tank installation site is consistent, thus ensure the repeatability of test；
Described fixed angles 29 is catch straight up, and the bottom of coal sample tank is installed in the space that three paracentral fixed angles 29 of coal sample tank fixed mount surround；
nullDescribed gas pre-mixed device 9 is that gas second mixing chamber 31 of gas the first mixing chamber 30 by prismatic and prismatic constitutes demountable structure through threaded，Gas the first mixing chamber is to be connected and composed prismatic structure by anterior triangle and rear portion triangle，The dividing plate that longitudinal section is triangle 32 that shape is identical is had in the rear portion triangle of gas the first mixing chamber，Dividing plate is inlaid in the rear portion triangle of gas the first mixing chamber from front to back，Two side superimposed before and after the rear portion triangle of both sides and gas the first mixing chamber before and after dividing plate，The first gas channel 33 is had between the top of the top of dividing plate and the rear portion triangle of gas the first mixing chamber，The second gas channel 34 is had between the bottom of the rear portion triangle of following and gas first mixing chamber of dividing plate，First gas channel and the second gas channel be intersected in gas the first mixing chamber and the junction of the second mixing chamber，Dividing plate make mixed gas shunting and gas the second mixing chamber 31 conflux make air-flow constitute disturbance thus gas can be made to reach more preferable premixing effect at gas the second mixing chamber 31，Size according to gas flow，Gas the first mixing chamber 30 is one or more.
Described air inlet pipe 10 and escape pipe 14 are polyfluortetraethylene pipe.
Described programmed temperature-rising controller 22 and coal sample temperature data acquisition card 23 are prior art, the LA-36 temperature programming temperature controller that programmed temperature-rising controller such as LOTUSANA Long Teng sage China produces；Coal sample temperature data acquisition card 23 is temperature acquisition card or moisture recorder, the SIN-R6000C colorful paper-free recorder humidity stress current/voltage electric quantity curve moisture recorder of moisture recorder such as sinomeasure.
Described balance 18 is prior art, the precise electronic balance Cubis MSU2203S-000-DA, precise electronic balance Cubis MSE3203S-000-DA, the precise electronic balance Cubis MSA5203S-000-DR(readability that produce such as Sai Duolisi are 1mg, and maximum range is respectively 2.2kg, 3.2kg, 5.2kg).
The invention provides a kind of test oxidation of coal temperature-raising characteristic while can measure the device of coal weight-loss, coal sample product/gas consumption feature of coal sample under temperature-raising characteristic curve, quality knots modification and different temperatures in oxidation temperature-rise period can be obtained simultaneously.Thus, construct the relation between coal sample product/gas consumption feature and temperature and quality knots modification and coal sample temperature-raising characteristic curve and quality knots modification etc.；Wherein, the coal quality knots modification at oxidation temperature-rise period is obtained in real time by balance, coal variations in temperature in oxidation temperature-rise period is obtained in real time by temperature sensor, obtain the product/gas consumption feature of coal under different temperatures by combination gas chromatograph, realize coal oxidation under different oxygen concentrations by gas mass flow controller and heat up；Wherein, (structure of quality knots modification part of detecting is quality knots modification part of detecting, coal sample tank bracket is connected with balance, by coal sample being loaded coal sample tank and being connected into gas circuit, such that it is able to realize the measurement in coal sample quality in temperature-rise period, wherein air inlet pipe all uses polyfluortetraethylene pipe to realize being connected with the first gas piping c outside temperature programming case, the second gas piping d with escape pipe, and the interference constituted into and out of trachea confrontation measurement can be corrected deduction by standard substance；Balance is electronic analytical balance, can realize the clearing of balance quality, display and data acquisition.In addition, coal sample tank bracket exposes temperature programming case and uses coal sample tank bracket containment vessel to protect with outer portion, thus realize whole quality test and be partially in the environment of relative closure the interference reducing the external world to mass measurement) be then, the framing structure that coal sample tank bracket uses equilateral triangle reduces its quality while ensureing stability, coal sample tank bracket completes preheating copper pipe simultaneously, coal sample tank and the support of cooling copper pipe, and coal sample tank bracket exposes temperature programming case and carries out protecting the interference making whole quality test be partially in the most airtight space thus to reduce the external world by coal sample tank bracket containment vessel with outer portion；Wherein, (structure of air-channel system is air-channel system, oxygen source and Nitrogen source gases, oxygen pressure steel cylinder is provided to be sequentially connected with the first air relief valve, first pressure maintaining valve the 3, first gas mass flow controller 4 and are connected with gas pre-mixed device by the first gas circuit pipeline a respectively by oxygen pressure steel cylinder and nitrogen high-pressure cylinder；Nitrogen high-pressure cylinder is sequentially connected with second air relief valve the 6, second pressure maintaining valve the 7, second gas mass flow controller 8 and is connected to the first gas circuit pipeline a by the second gas circuit pipeline b and is finally connected with gas pre-mixed device 9；Oxygen and nitrogen premix through gas pre-mixed device 9 and are connected with preheating copper pipe 11 through air inlet pipe 10 uniformly through the first gas piping c, preheating copper pipe 11 is connected with the air inlet of coal sample tank 12 bottom, the gas outlet on coal sample tank 12 top is connected with cooling copper pipe 13 and passes through escape pipe 14 and is connected outside second gas piping d, final gas enters gas chromatograph 15 and is analyzed), by oxygen pressure steel cylinder, nitrogen high-pressure cylinder, first gas mass flow controller, second gas mass flow controller and gas pre-mixed device realize the premix of different flow different oxygen concentrations gas, for the oxidation environment that the oxidation offer of coal is different, realize in oxidation of coal temperature-rise period, change its oxidation environment；Wherein, gas pre-mixed device is made up of gas the first mixing chamber and gas the second mixing chamber, confluxes for gas in gas the first mixing chamber front portion, and rear portion makes two strands of air-flows enter gas the second mixing chamber mutual disturbance of phase to reach more preferable mixed effect for gas distribution；Described gas chromatograph, programmed temperature-rising controller, coal sample temperature data acquisition card, sky are averagely connected with computer and realize the automatic record of data, i.e. programmed temperature-rising controller realizes the Real-time Collection of spin manifold temperature and transfers data to computer by connection and carry out automatic record；Coal sample temperature data acquisition cartoon excess temperature sensor acquisition coal sample temperature carries out automatic record by connection transmission to computer；Balance carries out Real-time Collection and sends data to computer by connection measured quality；Gas chromatograph sends data to computer by connection after being analyzed gas component.
During use, need correction, carry out the quality weighing part of instrument (present invention) is once corrected before using for the first time or every the regular period, bearing calibration is as follows: using standard test weight to be corrected balance, timing should ensure that coal sample tank, air-channel system and temperature sensor are in normal connection status thus get rid of the interference to mass measurement of the connecting tube circuit such as gas circuit, temperature sensor.It is 10% to the maximum in view of coal sample mass change amount when room temperature ~ 300 DEG C and tests used coal sample mass M (g), thus only the range of weighing of 90% ~ 100%M of quality Weighing system is corrected, if survey coal sample initial mass is 50g, then to quality Weighing system (quality weighing system indication coal sample tank, coal sample tank bracket, balance, preheating copper pipe, cooling copper pipe, temperature sensor, air inlet pipe, escape pipe.Owing to temperature sensor, air inlet pipe, escape pipe all directly contact with warming box, test result may be constituted interference, so that be corrected.Certainly the size also dependent on interference determines the need for correction) measurement between 45 ~ 50g is corrected.Correction uses standard test weight to be incremented by with 1mg, but can suitably be expanded counterweight by the workload of timing and be incremented by stride and obtain other data finally by difference.The quality weighing system deviation value in corresponding mass, i.e. mass deviation=counterbalance mass-balance display quality can be obtained according to counterbalance mass and balance display quality.
Open the chamber door of temperature programming case, coal sample tank is taken out and clears up, be again connected into air-channel system after being cleaned out by empty coal sample tank and guarantee the air-tightness connected；nullOpen oxygen pressure steel cylinder、Nitrogen high-pressure cylinder，The flow value of the first gas mass flow controller and the second gas mass flow controller is set (such as: the required total gas couette of experiment is 100mL/min、Oxygen and nitrogen fraction are respectively 20%、80%，Then the first gas mass flow controller and the second gas mass flow controller are respectively set to 20mL/min and 80mL/min，First gas mass flow controller is corrected with oxygen before this，Second gas mass flow controller is corrected with nitrogen)，Oxygen and nitrogen flow are after setting completed，Oxygen and nitrogen will carry out mix homogeneously by crossing gas pre-mixed device，The gas of mix homogeneously will be by the first gas piping c、Air inlet pipe 10、Preheating copper pipe 11、Coal sample tank 12、Cooling copper pipe 13、Escape pipe 14、Second gas piping d flows into gas chromatograph and is analyzed，Experiment then can be proceeded by after gas chromatograph institute detected gas component is setting value.After gas chromatograph institute detected gas component is stable, use balance is zeroed out, opening temperature programming case afterwards to be disassembled from air-channel system by coal sample tank, coal sample well prepared in advance is prior art by the lid opening coal sample tank) load coal sample tank screw the lid of coal sample tank and access air-channel system.Play coal sample quality this moment and then can carry out real time record by the gentle computer in sky.Temperature programming case controls the power of heating heating wire by programmed temperature-rising controller, so that temperature programming case carries out heating up with certain heating rate (e.g., after making temperature programming case reach initial temperature 30 DEG C in advance, rises to 300 DEG C with the heating rate of 1 DEG C/min.), owing to there is temperature difference while temperature programming case heats up, coal sample in coal sample tank also can heat up, coal sample temperature is acquired and is transferred to computer by temperature sensor and coal sample temperature data acquisition card to coal sample temperature and carries out record, and the transmission of temperature programming case temperature is carried out record to computer by programmed temperature-rising controller simultaneously.Air-channel system is coal sample supply fresh gas flow in coal sample tank, and fresh gas flow enters gas chromatograph through cooling copper pipe, escape pipe and the second gas piping d after reacting with coal sample and is analyzed, and obtained analysis result is transferred to computer by connection and carries out record.Close when testing complete.The quality knots modification in coal sample temperature-rise period, each gas component in coal sample tank gas outlet and volume fraction, coal sample heating curve can be obtained by the present invention.Quality knots modification in the coal sample temperature-rise period that need to point out need to be deducted and be only real coal sample quality knots modification by weight correcting obtained mass deviation value, institute's employing standard test weight is double outstanding board F1 level (100g-1mg) suit counterweights, described balance is prior art, the precise electronic balance Cubis MSU2203S-000-DA produced such as Sai Duolisi, precise electronic balance Cubis MSE3203S-000-DA, precise electronic balance Cubis MSA5203S-000-DR(readability is 1mg, maximum range is respectively 2.2kg, 3.2kg, the subpackage of weighing unit and display unit 5.2kg) can be realized, computer can be linked by R232 communication interface.The present invention is easy to use, shorten the oxidation temperature-raising characteristic curve of coal sample under temperature programming, quality knots modification and the measurement time of product/gas consumption feature, substantially increase work efficiency, decrease labor intensity, avoid repeated sampling and cause the waste of resource, use a kind of equipment, reduce experimental cost, and owing to achieving the oxidation temperature-raising characteristic curve of coal sample under temperature programming, quality knots modification and the synchro measure of product/gas consumption feature, make measurement result stability, error greatly reduces, reliable test result, achieve while oxidation of coal heats up and ature of coal amount knots modification can be measured in real time, there is significant economic and social benefit.
Claims (10)
- null1. a coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric，It is characterized in that，Oxygen pressure steel cylinder (1) is connected with gas pre-mixed device (9) through the first gas circuit pipeline (a)，Nitrogen high-pressure cylinder (5) through the second gas circuit pipeline (b) respectively with the first gas circuit pipeline (a)、Gas pre-mixed device (9) connects，Gas pre-mixed device is connected with air inlet pipe (10) through the first gas piping (c)，Air inlet pipe is connected with preheating copper pipe (11)，Preheating copper pipe (11) is placed in coal sample tank bracket bottom，The casing of temperature programming case is extended downwardly from bottom coal sample tank bracket below preheating copper pipe，It is placed on the pallet of balance (18)，The top of coal sample tank bracket protrudes upward the casing of temperature programming case，The cooling copper pipe (13) of the casing over top being placed in temperature programming case is had in the top of coal sample tank bracket，Equipped with coal sample tank (12) in coal sample tank bracket above preheating copper pipe，Preheating copper pipe (11) is connected with the air inlet of coal sample tank (12) bottom，The gas outlet on coal sample tank (12) top is connected with cooling copper pipe (13)，Cooling copper pipe connects the second gas piping (d) through escape pipe (14)，Second gas piping (d) is connected on gas chromatograph (15)，By gas chromatograph, gone out gas is analyzed，Temperature programming case is by casing (24)、Zone of heating (20)、Heat-insulation layer (21)、Programmed temperature-rising controller (22)、The enclosed construction of composition combined by coal sample temperature data acquisition card (23) and balance (18)，Casing periphery is enclosed with zone of heating，Heating wire is had in zone of heating，Zone of heating outer wrap has heat-insulation layer，Programmed temperature-rising controller outside heating wire and casing connects，The power of the heating wire in programmed temperature-rising controller control zone of heating realizes the intensification of casing，Coal sample tank is built with temperature sensor (16)，The free end of temperature sensor stretches out coal sample tank bracket and is connected with coal sample temperature data acquisition card (23)，Coal sample temperature data acquisition cartoon excess temperature sensor (16) samples of coal pulled temperature，Programmed temperature-rising controller、Coal sample temperature data acquisition card、Balance (18)、Gas chromatograph is all connected with computer.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1, it is characterized in that, between described oxygen pressure steel cylinder (1) and the first gas circuit pipeline (a), be connected with the first air relief valve (2), the first pressure maintaining valve (3), the first gas mass flow controller (4) in turn；The second air relief valve (6), the second pressure maintaining valve (7), the second gas mass flow controller (8) it is connected with in turn between described nitrogen high-pressure cylinder (5) and the second gas circuit pipeline (b).
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1; it is characterized in that; there is coal sample tank bracket containment vessel (19) at the casing top being contained in temperature programming case described periphery, coal sample tank bracket upper end; prevent the interference of outer bound pair coal sample tank bracket (17), affect the measurement of quality；Described temperature programming case is provided with chamber door, is used for opening installation and removal coal sample tank.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1, it is characterized in that, described coal sample tank bracket (17), through the position of casing, has perforation on casing, ensure that coal sample tank bracket (17) and casing crossover sites have space, do not contact.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1, it is characterized in that, described coal sample tank bracket is the integrative-structure being made up of the carrier (28) of the bottom-up preheating carrier (26) of copper pipe, the carrier (27) of coal sample tank and the cooling copper pipe vertically linked together, and the cross section of the carrier of the preheating carrier of copper pipe, the carrier of coal sample tank and cooling copper pipe is all in equilateral triangle.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 5, it is characterised in that the center of described equilateral triangle is that three angles of annulus, annulus and equilateral triangle connect through three supporting sticks respectively.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 6, it is characterized in that, carrier (27) middle part of described coal sample tank is embedded with the coal sample tank fixed mount of equilateral triangle, three Ge Bian centers of coal sample tank fixed mount are equipped with the fixed angles (29) for fixing coal sample tank position, for guaranteeing that each coal sample tank installation site is consistent, thus ensure the repeatability of test.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 7, it is characterized in that, described fixed angles (29) is catch straight up, and the bottom of coal sample tank is installed in the space that three paracentral fixed angles (29) of coal sample tank fixed mount surround.
- nullCoal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1，It is characterized in that，Described gas pre-mixed device (9) is that the gas the second mixing chamber (31) of the gas the first mixing chamber (30) by prismatic and prismatic constitutes demountable structure through threaded，Gas the first mixing chamber is to be connected and composed prismatic structure by anterior triangle and rear portion triangle，The dividing plate that longitudinal section is triangle (32) that shape is identical is had in the rear portion triangle of gas the first mixing chamber，Dividing plate is inlaid in the rear portion triangle of gas the first mixing chamber from front to back，Two side superimposed before and after the rear portion triangle of both sides and gas the first mixing chamber before and after dividing plate，The first gas channel (33) is had between the top of the top of dividing plate and the rear portion triangle of gas the first mixing chamber，The second gas channel (34) is had between the bottom of the rear portion triangle of following and gas first mixing chamber of dividing plate，First gas channel and the second gas channel be intersected in gas the first mixing chamber and the junction of the second mixing chamber，Dividing plate make mixed gas shunting and gas the second mixing chamber (31) conflux make air-flow constitute disturbance thus gas can be made to reach more preferable premixing effect at gas the second mixing chamber (31)，Size according to gas flow，Gas the first mixing chamber (30) is one or more.
- Coal spontaneous combustion characteristic detecting apparatus based on thermogravimetric the most according to claim 1, it is characterised in that described air inlet pipe (10) and escape pipe (14) are polyfluortetraethylene pipe；Described heat-insulation layer (21) is the shell structure that glass cotton is made.
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| WO2022047835A1 (en) * | 2020-09-01 | 2022-03-10 | 中国矿业大学(北京) | Experimental platform for measuring coal spontaneous combustion characteristic parameters |
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