Testing device for simulating spontaneous combustion and fire extinguishment processes of coal
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A test device, a technology for spontaneous combustion of coal, applied in the direction of fuel oil testing, material inspection products, etc., can solve the problems of large testing workload, difficult promotion and application, and high cost
Inactive Publication Date: 2012-05-09
TAIYUAN UNIV OF TECH
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[0002] Coal spontaneous combustion is a major disaster in the process of coal mine production, storage and transportation. It is very important to study the coal spontaneous combustion and fire extinguishing process, especially the temperature and gas changes and Characteristic analysis of products in different stages is an important basic research work for the prevention and control of coal spontaneous combustion fires. At present, in order to simulate the process of coal spontaneous combustion, programmed temperature rise test devices are widely used at home and abroad. The device is generally composed of a large reaction vessel. There are gas inlets and outlets, and multiple temperature sensors are installed inside the container to test the coal spontaneous combustion process and characteristics; due to the large size of this type of device, it is difficult to control high temperature; for low-temperature oxidation of coal, when the temperature is less than 180 ° C It is very important to study the spontaneous combustion characteristics of coal, and it is necessary to study the temperature and gas changes in the high-temperature combustion and fire-extinguishing process of coal, otherwise it will bring difficulties to mine fire prevention and control; large-scale equipment tests often require hundreds of kilograms of coal samples. Even several tons to tens of tons, the test period is long, and it takes dozens of days to several months to test a coal sample. The test workload is heavy, the cost is high, it is difficult to carry out repeated tests, and it is difficult to popularize and apply
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Embodiment 1
[0026] The simulated coal spontaneous combustion and fire extinguishing test methods are as follows:
[0027] 1), sample preparation
[0028] Take a fresh coal sample for crushing, sieve through a 60-80 mesh screen, dry the coal sample, and then loosely put it into the reactor;
[0029] 2), ventilation
[0030] The oxygen cylinder and the nitrogen cylinder are fed into the kettle at the same time, and the flow rate of oxygen and nitrogen is observed by adjusting the ratio of the mixed gas of oxygen and nitrogen, that is, the concentration of oxygen in the mixed gas. The total flow rate is 2000cm 3 / min, and recorded in Chart 3;
[0031] 3), temperature control
[0032] ① Regulate the temperature in the reaction kettle through the temperature controller on the electric control box, so as to control the temperature of the sample coal in the reaction kettle;
[0033] ②Adjust the heating frequency of 5°C / min, 10°C / min, 20°C / min, and adjust to a maximum temperature of 1100°C; ...
Embodiment 2
[0039] 1), ventilation
[0040] When the coal temperature in the reaction kettle rose to 200°C, turn off the oxygen cylinder to stop the oxygen supply, then connect the nitrogen cylinder, and adjust the nitrogen flow meter to the same value as the flow rate of the mixed gas in Example 1, 2000cm 3 / min;
[0041] 2), turn off the temperature controller
[0042] When the temperature in the reactor rises to 200°C, close the reactor warmer, stop heating, and then let the reactor cool down to normal temperature 25°C;
[0043] 3. Temperature and index gas monitoring
[0044] Reduce the temperature in the reactor by closing the temperature controller, and use a gas chromatograph to detect the gas sample at the outlet pipe. The coal temperature in the reactor is lowered by 10°C, and the gas components and their concentrations are detected and recorded in Chart 5;
[0045] 4), result analysis
[0046] Through the detection of the index gas at different temperatures, it is concluded ...
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Abstract
The invention relates to a testing device for simulating spontaneous combustion and fire extinguishment processes of coal. The main structure of the testing device is composed of a reaction kettle, a heating layer, an asbestos thermal insulating layer, a microwave generator, a base, a kettle cover, a gas filter screen, an intake valve, an intake pipe, an exhaust valve, an exhaust pipe, a temperature sensor, an electric cabinet, a control panel, a display screen, an indicator lamp, a power switch, a microwave controller, a measurement regulator, a control circuit board, an oxygen bottle, a nitrogen bottle and a lead, wherein the reaction kettle is employed for heating and preserving heat; the temperature sensor acquires information, and testing indicator gases in the spontaneous combustion and fire extinguishment processes of coal; oxygen is introduced to simulate spontaneous combustion, while the nitrogen is introduced to perform a fire extinguishing test, so that the change rules of the indicator gases of the spontaneous combustion and fire extinguishment processes of coal are obtained; as a result, scientific data is provided for spontaneous combustion fire prevention and extinguishment; besides, the device is advanced and rational in design, compact in structure, safe, stable and reliable, convenient to operate and use, widely applicable to many test and experiment items, high in test accuracy and short in test time.
Description
technical field [0001] The invention relates to a test device for simulating coal spontaneous combustion and fire extinguishing process, which belongs to the technical field of equipment and methods for simulating coal spontaneous combustion process, measuring coal spontaneous combustion characteristics and fire extinguishing test. Background technique [0002] Coal spontaneous combustion is a major disaster in the process of coal mine production, storage and transportation. It is very important to study the coal spontaneous combustion and fire extinguishing process, especially the temperature and gas changes and The characteristic analysis of products in different stages is an important basic research work for the prevention and control of coal spontaneous combustion fires. At present, in order to simulate the process of coal spontaneous combustion, programmed temperature rise test devices are widely used at home and abroad. The device is generally composed of a large reacti...
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