CN106896034B - Coal sample crushing process gas loss measurement experiment system and method - Google Patents
Coal sample crushing process gas loss measurement experiment system and method Download PDFInfo
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Abstract
An experimental system and method for measuring gas loss in a coal sample crushing process are provided. The experiment system comprises an experiment main body device, a vacuum pumping system, a pressure loading system, a gas loading system, a linear motor control system, a digital mass flowmeter and a gas collecting system. The simulation of the process of initial desorption of the coal seam broken gas can be realized, and an experimental means is provided for mastering the initial desorption rule of the coal seam broken gas. The law of initial gas desorption of different coal beds when the coal beds are broken under different environmental parameters can be analyzed through a large amount of experimental data, and a gas desorption amount calculation formula is summarized. The method provides a scientific theoretical basis for calculating the gas loss in the method for measuring the coal seam gas content by the direct method, improves the measurement accuracy of the direct method, and provides technical support for coal mine safety mining.
Description
Technical Field
The invention belongs to the field of coal mine gas disaster prevention and control, and particularly relates to a coal sample crushing process gas loss measurement experiment system and method.
Background
Coal and gas outburst is an extremely complex gas dynamic disaster phenomenon occurring under a coal mine. In 2009, regulations on prevention and control of coal and gas outburst are implemented in China, and strict requirements are put on exploitation of coal and gas outburst coal seams, but the prevention and control situation of coal and gas outburst disasters is still severe, and accidents happen occasionally. The method can predict the outburst of coal and gas, can guide the scientific application of outburst prevention measures, reduce the engineering quantity of the outburst prevention measures and ensure the personal safety of the personnel operating the outburst coal seam. Therefore, the salient prediction has great practical significance. According to the comprehensive effect hypothesis of coal and gas outburst, the gas content of the coal bed is a direct control factor of the gas outburst, and the coal bed has the possibility of outburst only when certain gas content is achieved. In recent years, the coal bed gas content is getting more and more attention at home and abroad as an index for predicting the outburst risk.
The method for directly measuring the coal seam gas content mainly comprises the steps of analyzing the gas quantity, the gas loss quantity and the residual gas quantity on site. The gas quantity analyzed on site and the gas quantity remained in the coal sample tank can be directly measured, but the lost gas quantity needs to be obtained on the basis of the data analyzed on site and related recording parameters. The underground gas loss mainly refers to the content of gas released before the drill bit drills a coal seam and the coal sample canning sealed and communicated desorption instrument starts to desorb, and the initial desorption speed of the gas is very high, so that the accurate calculation of the loss is a difficult point for measuring the gas content of the coal seam.
At present, the lost gas quantity is obtained by compensation calculation, and as for the compensation calculation of the lost gas quantity, many colleges at home and abroad make a great deal of research on the compensation aspect of the gas loss quantity in the process of directly determining the coal bed gas content, and the research is well known as follows: bos barrer, university of cambridge, engineering doctor went, germany, ussinofu, former soviet researchers; the Australian student Bote, university of Utah, Shenyang institute of coal science research, Wang Youna, Chongqing institute, Sunwei Xue, and the like. However, the gas desorption rules of all compensation calculation formulas and methods are different in different time periods, different coal qualities and different media, so that the loss gas quantity error calculated by adopting the compensation formulas is large, the accuracy of the gas content measurement value of the direct method is directly influenced, and potential safety hazards are brought to the safety production of coal mines.
Disclosure of Invention
The invention provides an experimental system and method for measuring gas loss in a coal sample crushing process, in order to reveal the rule of initial desorption of coal bed gas after a drill bit drills through a coal bed in the direct method gas content measuring process.
The experiment system comprises an experiment main body device, a vacuum pumping system, a pressure loading system, a gas loading system, a linear motor control system, a digital mass flowmeter and a gas collecting system.
The experiment main body device comprises two cabin bodies: a crushed coal bunker for storing crushed coal generated in the drilling process; a briquette bunker for placing the prepared briquettes.
The broken coal bunker consists of a high-pressure-resistant cavity, a linear motor is arranged in front of the cavity, a screw drill of the linear motor extends into the broken coal bunker and is aligned with an opening position between the broken coal bunker and the molded coal bunker, and after the linear motor is started, the screw drill can drill into the molded coal bunker to break molded coal. There are two gas ports on the upper portion of broken coal storehouse cavity: one is a crushed coal bin gas outlet A which is used for vacuumizing the crushed coal bin; the other is a crushed coal bin gas outlet B which is used for discharging desorbed nitrogen when the molded coal is crushed. A bin cover is arranged at the lower part of the cavity of the crushed coal bin, and crushed coal in the crushed coal bin can be taken out by opening the bin cover of the crushed coal bin after the screw drill is finished drilling.
The molded coal bin consists of a high-pressure resistant cavity, and an opening is arranged at the center of the front part of the cavity and can allow a screw drill to pass through to crush molded coal in the molded coal bin. The opening is provided with a clapboard for separating the briquette coal bin from the crushed coal bin before experimental briquette coal placement. There are two gas ports on moulded coal storehouse cavity upper portion: one is a coal bunker gas filling port used for filling experimental nitrogen into the coal briquettes in the coal bunker; and the other gas port is a coal bunker gas outlet and is used for vacuumizing the coal bunker before inflation. The rear part of the cavity of the briquette coal bin is provided with a pressure loading push rod for applying set pressure to the briquette coal.
During the experiment, garrulous coal storehouse gas outlet A and moulded coal storehouse gas outlet link to each other with vacuum pumping system, and garrulous coal storehouse gas outlet B links to each other with digital mass flow meter, gas collecting system in proper order, and moulded coal storehouse inflation inlet links to each other with gas loading system, and pressure loading push rod links to each other with pressure loading system, and linear electric motor links to each other with linear electric motor control system.
The invention also provides a method for measuring the gas loss amount in the coal sample crushing process, which comprises the following specific steps:
(1) firstly, collecting a coal sample, and preparing the molded coal according to a similar principle;
(2) connecting and assembling relevant parts of the experiment system, and placing a partition plate at a connecting hole between the crushed coal bin and the briquette coal bin;
(3) placing the prepared molded coal into a molded coal bin, sealing the molded coal bin by using a sealing device, checking the air tightness, closing valves B of an air charging port of the molded coal bin and an air outlet B of a crushed coal bin after the air tightness is determined to be good, opening valves A of the air outlet of the molded coal bin and the air outlet A of the crushed coal bin, and vacuumizing the molded coal and the crushed coal bin by using a vacuum pump;
(4) closing valves A of a gas outlet of the molded coal bin and a gas outlet of the crushed coal bin, and opening a valve of a gas filling port of the molded coal bin to fill gas into the molded coal, so that the gas pressure is kept stable, and the gas is filled for more than 12 hours;
(5) after the inflation is finished, a press machine is started to pressurize the molded coal to the design pressure through a pressure loading push rod, and the pressure is maintained for 30 minutes;
(6) opening a valve B at the gas outlet of the crushed coal bin, starting a linear motor, pushing a screw drill bit to penetrate through a partition plate, and crushing the molded coal;
(7) when the set time is up, closing the linear motor and a valve B at an air outlet of the crushed coal bin;
(8) recording the initial desorption rate during crushing by the digital mass flowmeter, and recording the total desorption amount by the measuring cylinder;
(9) opening a crushed coal bin to collect crushed coal, and screening and weighing the collected crushed coal;
(10) and analyzing the desorption rule in the crushing process of the briquette.
By adopting the technical scheme, the simulation method can simulate the process of initial desorption of the coal seam broken gas, and provides an experimental means for mastering the initial desorption rule of the coal seam broken gas. The law of initial gas desorption of different coal beds when the coal beds are broken under different environmental parameters can be analyzed through a large amount of experimental data, and a gas desorption amount calculation formula is summarized. The method provides a scientific theoretical basis for calculating the gas loss in the method for measuring the coal seam gas content by the direct method, improves the measurement accuracy of the direct method, and provides technical support for coal mine safety mining.
Drawings
FIG. 1 is a schematic structural diagram of a main body device of a coal sample crushing process gas loss measurement experiment adopted by the invention. In the figure: the coal crushing device comprises a 1-1 screw drill bit, a 1-2 linear motor, a 1-3 crushed coal bin gas outlet A, a 1-4 crushed coal bin gas outlet B, a 1-5 crushed coal bin, a 1-6 partition plate, a 1-7 briquette bin, 1-8 briquettes, a 1-9 connecting rod, a 1-10 briquette bin gas charging port, a 1-11 briquette bin gas outlet, a 1-12 pressure loading push rod and a 1-13 crushed coal bin cover.
Detailed Description
Before the experiment is carried out, firstly, a coal sample of an underground coal seam of a coal mine is collected, raw coal is crushed by a crusher, then, a dry coal sample is placed into a vibrating screen for screening, and molded coal is manufactured according to a similar principle and a certain proportion for standby application. And (3) completing the assembly of the experiment system, and connecting the experiment main body device and other auxiliary systems according to the composition of the experiment system: the linear motor 1-2 is connected to a linear motor control system, a crushed coal bin gas outlet A (1-3) and a molded coal bin gas outlet (1-11) are connected to a vacuum pumping system, a crushed coal bin gas outlet B (1-4) is sequentially connected with a digital mass flowmeter and a gas collecting system, a molded coal bin gas filling port (1-10) is connected to a gas loading system, and a pressure loading push rod (1-12) is connected to the pressure loading system.
In the beginning of the experiment, a special partition plate (1-6) is firstly arranged at a connecting hole between a molded coal bin and a crushed coal bin, and then molded coal is put into the molded coal bin (1-7). And sealing the experiment main body device, checking the air tightness, opening valves of a crushed coal bin air outlet A (1-3) and a molded coal bin air outlet (1-11) after confirming that the air tightness is good, closing valves of a crushed coal bin air outlet B (1-4) and a molded coal bin air inlet (1-10), and vacuumizing molded coal in the crushed coal bin and the molded coal bin by using a vacuum pump. After the vacuum pumping is finished, the valves of the gas outlet A (1-3) of the crushed coal bin and the gas outlet (1-11) of the briquette coal bin are closed, the valve of the gas charging port (1-10) of the briquette coal bin is opened, the briquette coal is charged with nitrogen for experiments, the air pressure is kept stable, and the briquette coal is charged for more than 12 hours. After the inflation is finished, a press machine is started to load the molded coal to the designed pressure, and the pressure is maintained for 30 minutes. Opening a valve of a gas outlet B (1-4) of the crushed coal bin, starting a linear motor (1-2) according to the design drilling speed of an experimental scheme, pushing a screw drill bit (1-1) forward, drilling through a partition plate (1-6), starting crushing of the molded coal (1-8), enabling the crushed coal to fall into the crushed coal bin (1-5), enabling nitrogen desorbed by crushing of the molded coal to enter a gas collection system through the gas outlet B (1-4) of the crushed coal bin through a digital mass flow meter, recording the nitrogen desorption rate in the crushing process by the digital mass flow meter within the set time of the experiment, and collecting all desorbed gas by the gas collection system. And (3) stopping the linear motor (1-2) after the set time of the experiment is reached, closing a valve B (1-4) of a crushed coal bin gas outlet, opening a crushed coal bin cover (1-13), collecting all crushed coal, and screening and weighing the crushed coal.
At the end of the experiment, the data recorded during the experiment were analyzed.
Claims (1)
1. A method for measuring gas loss in a coal sample crushing process is characterized by comprising the following steps: the method comprises the following specific steps:
(1) firstly, collecting a coal sample, and preparing the molded coal according to a similar principle;
(2) the connection assembly of relevant parts of an experiment system is completed, the experiment system consists of an experiment main body device, a vacuum pumping system, a pressure loading system, a gas loading system, a linear motor control system, a digital mass flow meter and a gas collecting system, and the experiment main body device comprises two bin bodies: a crushed coal bunker for storing crushed coal generated in the drilling process; a briquette bunker for placing the prepared briquettes; a clapboard is arranged at the position of a connecting hole between the crushed coal bin and the molded coal bin;
the crushed coal bin consists of a high-pressure resistant cavity, a linear motor is arranged in front of the cavity, a screw drill of the linear motor extends into the crushed coal bin and is aligned with an opening position between the molded coal bin and the crushed coal bin, and after the linear motor is started, the screw drill drills into the molded coal bin to crush molded coal; there are two gas ports on the upper portion of broken coal storehouse cavity: one is a crushed coal bin gas outlet A which is used for vacuumizing the crushed coal bin; the other is a crushed coal bin gas outlet B which is used for discharging desorbed nitrogen when the molded coal is crushed; a bin cover is arranged at the lower part of the crushed coal bin cavity, and crushed coal in the crushed coal bin is taken out by opening the bin cover of the crushed coal bin after drilling of the screw drill is finished;
the moulded coal storehouse comprises a high pressure resistant cavity, and the anterior central point of cavity puts an opening, can let the screw rod drill bit pass through, the moulded coal in the broken moulded coal storehouse, and a baffle will be placed before the moulded coal is placed in the experiment to this opening for keep apart moulded coal storehouse and broken coal storehouse, there are two gas ports on moulded coal storehouse cavity upper portion: one is a coal bunker gas filling port used for filling experimental nitrogen into the coal briquettes in the coal bunker; the other gas port is a coal bunker gas outlet and is used for vacuumizing the coal bunker before inflation, and a pressure loading push rod is arranged at the rear part of a cavity of the coal bunker and is used for applying set pressure to the coal;
during the experiment, a crushed coal bin gas outlet A and a molded coal bin gas outlet are connected with a vacuum pumping system, a crushed coal bin gas outlet B is sequentially connected with a digital mass flowmeter and a gas collecting system, a molded coal bin gas charging port is connected with a gas loading system, a pressure loading push rod is connected with the pressure loading system, and a linear motor is connected with a linear motor control system;
(3) placing the prepared molded coal into a molded coal bin, sealing the molded coal bin by using a sealing device, checking the air tightness, closing valves B of an air charging port of the molded coal bin and an air outlet B of a crushed coal bin after the air tightness is determined to be good, opening valves A of the air outlet of the molded coal bin and the air outlet A of the crushed coal bin, and vacuumizing the molded coal and the crushed coal bin by using a vacuum pump;
(4) closing valves A of a gas outlet of the molded coal bin and a gas outlet of the crushed coal bin, and opening a valve of a gas filling port of the molded coal bin to fill gas into the molded coal, so that the gas pressure is kept stable, and the gas is filled for more than 12 hours;
(5) after the inflation is finished, a press machine is started to pressurize the molded coal to the design pressure through a pressure loading push rod, and the pressure is maintained for 30 minutes;
(6) opening a valve B at the gas outlet of the crushed coal bin, starting a linear motor, pushing a screw drill bit to penetrate through a partition plate, and crushing the molded coal;
(7) when the set time is up, closing the linear motor and a valve B at an air outlet of the crushed coal bin;
(8) recording the initial desorption rate during crushing by the digital mass flowmeter, and recording the total desorption amount by the measuring cylinder;
(9) opening a crushed coal bin to collect crushed coal, and screening and weighing the collected crushed coal;
(10) and analyzing the desorption rule in the crushing process of the briquette.
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| CN102128765B (en) * | 2010-12-09 | 2012-06-13 | 中国矿业大学 | Method for directly and rapidly measuring coal seam gas content in underground coal mine |
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