NL2020226B1 - Coal oxidation characteristic test device based on coal and gas symbiosis and test method thereof - Google Patents
Coal oxidation characteristic test device based on coal and gas symbiosis and test method thereof Download PDFInfo
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Abstract
The present invention discloses a coal oxidation characteristic test device based on coal and gas symbiosis. The device includes an air source, a methane gas source, two branch flow meters, a tee valve, a water seal buffer, a total flow meter, a dryer, a one-way gas valve, a fire resistance breathing valve and a cavity, after the air source communicates with the methane gas source, a gas pipe is inserted in a gas inlet of the cavity, an explosive-proof plate and an electric heating coil connected with a temperature control system are arranged at the middle of the cavity, a temperature sensing probe connected with a temperature monitor and a tray are arranged in the explosive-proof plate, a sealing cover, a rupture disk and a gas outlet are arranged on an upper end of the cavity, and the temperature control system, the temperature monitor and a microbalance are respectively connected with a data collection system. The present invention is suitable for researching the coal oxidation characteristics under a coal and gas symbiosis condition, and has fire-proof and explosion-proof characteristics, thereby preventing the damage caused by gas explosion in a test process, and the sample adding amount is relatively large, thereby overcoming the problem of too small coal sample adding amount of the traditional research methods. The present invention further provides a test method of the device.
Description
COAL OXIDATION CHARACTERISTIC TEST DEVICE BASED ON COALAND GAS SYMBIOSIS AND TEST METHOD THEREOF
Field of the Invention
The present invention relates to the field of researches on prevention and control of coalmine disasters, and in particular to a coal oxidation characteristic test device based oncoal and gas symbiosis and a test method thereof.
Background of the Invention
According to statistics, more than half of coal mines in China have natural fire problems,which makes China become one of the countries with many spontaneous combustionaccidents in the world. Researches on the spontaneous combustion characteristics ofcoal are an important basis of prevention and control of the spontaneous combustion ofcoal. There are many ways to identify the spontaneous oxidation characteristics of coal,of which the thermogravimetric analysis method has been approved by manyresearchers. The thermogravimetric analysis method can obtain the change law of themass of coal during a coal oxidation process in a specific atmosphere so as to obtaindynamic oxidation oxygen absorption of coal. At the same time, the kinetic parameterscan be determined by a thermal weight loss curve of coal, the activation energy in a coaloxidation phase is calculated by using the Coasts-Redfern integral method, the AcharDifferential method and other methods, and the complexity of the spontaneouscombustion of coal in the specific atmosphere can be intuitively judged.
The device used in the traditional thermogravimetric analysis method is generally acommon thermogravimetric analyzer, this instrument can measure the kineticparameters of coal in air, nitrogen and carbon dioxide atmospheres, however under acoal and gas symbiosis condition, as the gas is easy to explode under a high temperaturecondition, causing damage to the machine and injury to researchers, therefore the traditional thermogravimetric analysis method is not suitable for researching the coaloxidation characteristics under the coal and gas symbiosis condition.
Summary of the Invention
The objective of the present invention is to overcome the above problems in the prior artand to provide a coal oxidation characteristic test device based on coal and gassymbiosis, and a test method thereof. The test device is simple to operate, has fire-proofand explosion-proof characteristics and is suitable for researching coal oxidationcharacteristics under the coal and gas symbiosis condition.
In order to achieve the above technical objective, the present invention is achieved bythe following technical solutions: A coal oxidation characteristic test device based on coal and gas symbiosis includes anair source, a methane gas source, two branch flow meters, a tee valve, a water seal buffer,a total flow meter, a dryer, a one-way gas valve, a fire resistance breathing valve and acavity, inlets of the air source, the methane gas source and the water seal buffercommunicate with the tee valve through gas pipes, a branch flow meter is arranged oneach of the gas pipes among the air source, the methane gas source and the tee valve, anoutlet of the water seal buffer is connected with the gas inlets of the dryer, the one-waygas valve, the fire resistance breathing valve and the cavity through gas pipes insequence, and the total flow meter is arranged on the gas pipe between the water sealbuffer and the dryer; a tubular explosive-proof plate is arranged at the middle of thecavity, an electric heating coil is arranged at the outside of the explosive-proof plate, atemperature sensing probe and a tray are arranged in the explosive-proof plate, thetemperature sensing probe is located below the tray, a sealing cover, a rupture disk and agas outlet are arranged on an upper end of the cavity, a water inlet and a water outlet arerespectively formed in two ends of the cavity, a constant temperature circulating watertank is connected between the water inlet and the water outlet via a water pipe, theelectric heating coil is connected with a temperature control system, the temperaturesensing probe is connected with a temperature monitor, the tray is connected with a microbalance located at the outside of the cavity, and the temperature control system, thetemperature monitor and the microbalance are respectively connected with a datacollection system through lines.
Further, the air source and the methane gas source are bottled gas sources.
Further, the cavity is of a double-layer structure having an interlayer, and the water inletand the water outlet communicate with the interlayer of the cavity.
Further, the explosive-proof plate is made of a cast iron or a light alloy with weightpercentage of magnesium being not greater than 6%.
Further, the rupture disk takes the shape of a circular ring on the whole, and the shape ofthe section at the middle of the bottom end is an upward pre-arc.
Further, a circular driving water pump is arranged in the constant temperature circulatingwater tank.
The test method of the coal oxidation characteristic test device based on coal and gassymbiosis in the present invention includes the following steps: 1) starting the constant temperature circulating water tank, and setting ato-be-maintained temperature of the cavity; 2) after the constant temperature circulating water tank reaches the set temperature,sequentially opening the data collection system, the microbalance, the temperaturemonitor and the temperature control system, and setting a starting temperature, anending temperature and a temperature rise rate of program temperature rise of thetemperature control system, and a sample serial number; 3) sequentially opening the total flow meter, the branch flow meters, the air source andthe methane gas source, and adjusting the branch flow meters to change the ratio ofmethane gas to the air so as to obtain a coal and gas symbiosis atmosphere necessary forthe test; 4) after the cavity subjected to the program temperature control reaches the set startingtemperature, opening the sealing cover, placing a sample tray on the tray, andperforming mass zero clearing by using the microbalance, then taking out a properamount of to to-be-tested coal sample from the sample tray, placing the sample tray onthe tray again, covering the sealing cover, starting the temperature rise program, and observing the oxidation thermal weight loss condition of coal via the data collectionsystem; and 5) starting cooling when the experimental temperature reaches the set endingtemperature, when the temperature is lower than 50°C, taking out the sample tray,closing the air source, the flow meters and the systems, and then the whole test process isaccomplished.
Compared with the prior art, the present invention has the following beneficial effects: 1. The components are simple in structure, convenient in test operations and are suitablefor researching the coal oxidation characteristics under the coal and gas symbiosiscondition. 2. The test device has fire-proof and explosion-proof characteristics, and the water sealbuffer, the one-way gas valve, the fire resistance breathing valve, the explosive-proofplate, the rupture disk and other safety devices are adopted to effectively prevent thesituations of machine damage and injury to researchers caused by gas explosion in thetest process. 3. The sample adding amount of the test device can reach lOOg, thereby effectivelyovercoming the problem of too small coal sample adding amount in the research of thecoal oxidation characteristics by the traditional thermogravimetric analysis method.
Of course, any product implementing the present invention does not necessarily achieveall the advantages described above at the same time.
Brief Description of the Drawings
Fig.l is a structural schematic diagram of a coal oxidation characteristic test devicebased on coal and gas symbiosis of the present invention.
Reference signs: 1-air source, 2-methane gas source, 3-branch flow meter, 4-tee valve,5-water seal buffer, 6-total flow meter, 7-dryer, 8-one-way gas valve, 9-fire resistancebreathing valve, 10-sealing cover, 11-rupture disk, 12-gas outlet, 13-water inlet,14-water outlet, 15-electric heating coil, 16-explosive-proof plate, 17-temperaturesensing probe, 18-tray, 19-gas inlet, 20-temperature control system, 21-temperature monitor, 22-microbalance, 23-data collection system, 24-constant temperaturecirculating water tank, and 25-cavity.
The present invention will be further illustrated below in combination with specificembodiments and the drawings.
Detailed Description of the Embodiments
As shown in Fig.l, a coal oxidation characteristic test device based on coal and gassymbiosis includes an air source 1, a methane gas source 2, two branch flow meters 3, atee valve 4, a water seal buffer 5, a total flow meter 6, a dryer 7, a one-way gas valve 8, afire resistance breathing valve 9 and a cavity 25, inlets of the air source 1, the methanegas source 2 and the water seal buffer 5 communicate with the tee valve 4 through gaspipes, a branch flow meter 3 is respectively arranged on each of the gas pipes among theair source 1, the methane gas source 2 and the tee valve 4, an outlet of the water sealbuffer 5 is connected with the gas inlets of the dryer 7, the one-way gas valve 8, the fireresistance breathing valve 9 and the cavity 25 through gas pipes in sequence, and thetotal flow meter 6 is arranged on the gas pipe between the water seal buffer 5 and thedryer 7; a tubular explosive-proof plate 16 is arranged at the middle of the cavity 25, anelectric heating coil 15 is arranged at the outside of the explosive-proof plate 16, atemperature sensing probe 17 and a tray 18 are arranged in the explosive-proof plate 16,the temperature sensing probe 17 is located below the tray 18, a sealing cover 10, arupture disk 11 and a gas outlet 12 are arranged on an upper end of the cavity 25, a waterinlet 13 and a water outlet 14 are respectively formed in two ends of the cavity 25, aconstant temperature circulating water tank 24 is connected between the water inlet 13and the water outlet 14 via a water pipe, the electric heating coil 15 is connected with atemperature control system 20, the temperature sensing probe 17 is connected with atemperature monitor 21, the tray 18 is connected with a microbalance 22 located at theoutside of the cavity 25, and the temperature control system 20, the temperature monitor21 and the microbalance 22 are respectively connected with a data collection system 23through lines.
The air source 1 and the methane gas source 2 are bottled gas sources, the cavity 25 is ofa double-layer structure having an interlayer, the water inlet 13 and the water outlet 14communicate with the interlayer of the cavity 25, the explosive-proof plate 16 is made ofa cast iron or a light alloy with weight percentage of magnesium being not greater than6%, the rupture disk 11 takes the shape of a circular ring on the whole, and the shape ofthe section at the middle of the bottom end is an upward pre-arc, and a circular drivingwater pump is arranged in the constant temperature circulating water tank 24.
The test method of the coal oxidation characteristic test device based on coal and gassymbiosis in the embodiment includes the following steps: 1) starting the constant temperature circulating water tank 24, and setting ato-be-maintained temperature of the cavity 25; 2) after the constant temperature circulating water tank 24 reaches the set temperature,sequentially opening the data collection system 23, the microbalance 22, the temperaturemonitor 21 and the temperature control system 20, and setting a starting temperature, anending temperature and a temperature rise rate of program temperature rise of thetemperature control system 20, and a sample serial number; 3) sequentially opening the total flow meter 6, the branch flow meters 3, the air source 1and the methane gas source 2, and adjusting the branch flow meters 3 to change the ratioof methane gas to the air so as to obtain a coal and gas symbiosis atmosphere necessaryfor the test; 4) after the cavity 25 subjected to the program temperature control reaches the setstarting temperature, opening the sealing cover 10, placing a sample tray on the tray 18,and performing mass zero clearing by using the microbalance 22, then taking out aproper amount of to to-be-tested coal sample from the sample tray, placing the sampletray on the tray 18 again, covering the sealing cover 10, starting the temperature riseprogram, and observing the oxidation thermal weight loss condition of coal via the datacollection system 23; and 5) starting cooling when the experimental temperature reaches the set endingtemperature, when the temperature is lower than 50°C, taking out the sample tray,closing the air source, the flow meters and the systems, and then the whole test process is accomplished.
The above-mentioned embodiments merely illustrate the preferred embodiments of thepresent invention, and do not limit the scope of the present invention. Various variationsand improvements of the technical solutions of the present invention made by those ofordinary skill in the art without departing from the design spirit of the present inventionshould fall within the protection scope defined by the claims of the present invention.
Claims (7)
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NL2020226A NL2020226B1 (en) | 2018-01-02 | 2018-01-02 | Coal oxidation characteristic test device based on coal and gas symbiosis and test method thereof |
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NL2020226A NL2020226B1 (en) | 2018-01-02 | 2018-01-02 | Coal oxidation characteristic test device based on coal and gas symbiosis and test method thereof |
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