CN113358846B - Gas-supplementing coal and gas outburst dynamic effect simulation experiment device and method - Google Patents
Gas-supplementing coal and gas outburst dynamic effect simulation experiment device and method Download PDFInfo
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- CN113358846B CN113358846B CN202110653640.2A CN202110653640A CN113358846B CN 113358846 B CN113358846 B CN 113358846B CN 202110653640 A CN202110653640 A CN 202110653640A CN 113358846 B CN113358846 B CN 113358846B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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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
- G01N33/225—Gaseous fuels, e.g. natural gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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Abstract
The invention relates to a device and a method for simulating the dynamic effect of air-supplemented coal and gas outburst, belonging to the technical field of coal and gas outburst disaster-causing simulation experiments; the device comprises an air supplementing tank, wherein the air supplementing tank is connected with an air supplementing pipeline, a one-way valve is arranged on the air supplementing pipeline, the other end of the air supplementing pipeline is connected with an air inlet of an inflating flange, an air outlet is formed in the inflating flange and communicated with an inner cavity of a protruding cavity, one end of a main body of the protruding cavity is connected and sealed with the inflating flange, and the other end of the main body of the protruding cavity is connected with a protruding opening; according to the protruding cavity V 0 Calculating the volume V of free gas participating in outburst work in the actual coal seam pressure relief area 2 And the air is filled into the air supply tank, and air is supplied to the protruding cavity through the air supply pipeline and the air supply flange; the problem that the experimental data of the coal and gas outburst effect is inaccurate due to the fact that the conventional coal and gas outburst dynamic effect simulation experimental device and method do not quantitatively analyze gas permeation of a pressure relief area is solved through the simple and easy-to-operate experimental device and method.
Description
Technical Field
The invention belongs to the technical field of coal and gas outburst disaster-causing simulation experiments, and relates to a gas-supplementing coal and gas outburst dynamic effect simulation experiment device and method.
Background
China is the largest coal producing country and consuming country in the world, and coal plays an important role in the energy structure of China. Although corresponding series of prevention and control measures are adopted, mine dynamic disasters related to coal rock gas still occur, and the mechanism of coal rock gas catastrophe is not clear and perfect after the foundation is concluded.
Coal and gas outburst is one of typical dynamic disasters of coal mines, has extremely strong destructiveness and seriously restricts the safety production of the coal mines. The current research on coal and gas outburst usually focuses on the coal body and the action of gas, however, outburst occurs as a result of the combined action of coal, gas and roof and floor. At present, the research aiming at coal and gas outburst is generally carried out by taking outburst holes as set objects, the work and the gas action of coal bodies in the outburst range are mainly considered, and the action of gas desorption of pressure relief coal bodies around the outburst holes on the outburst is less considered in the disaster-causing research of the coal and gas outburst. For example, the reference CN 104181282A only shows a specific flow chart of a coal and gas outburst dynamic effect simulation experiment method, and does not relate to gas supply; the reference document CN105891440A considers gas supply and is implemented by means of a gas supply bag, but the design of the gas supply bag and its pipeline lacks quantitative basis and is not given in the reference document, which is only qualitative research and has limited practical guiding significance. The inventor finds that: in the throwing process of the broken coal body related to the coal and gas outburst, desorption gas in the pressure relief area participates in different degrees, the gas content of the outburst ton coal in the coal and gas outburst accident is far greater than that of the original coal bed, and a large amount of gas participates in the coal body in the pressure relief area around the actual outburst hole to cause the outburst dynamic effect. Therefore, the outburst reduction process can be more truly realized by accurately simulating the outburst action process of coal desorption gas in the pressure relief area, the outburst gas emission rule is inverted, and it is obviously unreasonable to omit the outburst gas in the traditional research. Quantitative expression of desorption gas participation outburst in the pressure relief area is not established, and based on the quantitative expression, research and development of related experimental systems and related experimental methods are urgently needed, so that the understanding of the coal and gas outburst disaster causing mechanism is further improved.
Disclosure of Invention
In view of the above, the present invention provides a coal and gas outburst dynamic effect simulation experiment apparatus and method for supplementing gas, which fully considers the effect of pressure relief coal body desorption gas around the outburst hole on the outburst, improves the understanding of coal and gas outburst disaster causing mechanism through a simple and easy-to-operate experiment apparatus and method, and solves the problem that the experiment data is inaccurate due to the fact that the traditional coal and gas outburst dynamic effect simulation experiment apparatus and method do not quantitatively analyze the gas permeation in the pressure relief area to cause the coal and gas outburst effect.
In order to achieve the purpose, the invention provides the following technical scheme: a simulation experiment device for a coal and gas outburst dynamic effect for supplying air comprises an air supply tank, wherein the air supply tank is connected with an air supply pipeline, a one-way valve is arranged on the air supply pipeline, the other end of the air supply pipeline is connected with an air inlet of an inflation flange, an air outlet is formed in the inflation flange and is communicated with an inner cavity of a outburst cavity, the outburst cavity comprises an outburst cavity body and a outburst opening, one end of the outburst cavity body is connected and sealed with the inflation flange, and the other end of the outburst cavity body is connected with the outburst opening; and the air in the air supplementing tank is supplemented to the protruding cavity through the air supplementing pipeline and the air charging flange.
Furthermore, the air outlets of the inflatable flanges are uniformly distributed on the inflatable flanges.
Further, the protruding cavity body and the protruding opening are both hollow cylinders.
A simulation experiment method for air-supplemented coal and gas outburst dynamic effect comprises the following steps:
A. determining the required maximum air supplement amount V 2 And the volume V of the air supply tank 3 ；V 3 ≥V 2
a1, according to the volume V of the protruding cavity 0 Calculating the equivalent radius r of the outburst coal body in the actual coal seam;
a2, calculating the equivalent radius R of the coal body in the pressure relief area in the actual coal bed according to the equivalent radius R of the outburst coal body;
a3, calculating the volume V of the coal body in the pressure relief area except the outburst coal body 1 ；
a4, calculating the volume of free gas of the pressure relief area participating in the outstanding work, namely the required maximum gas compensation volume V 2 ；
B. Determination of the internal diameter d of the gas supply line 1 ；
b1, determining the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And an air flow velocity v;
b2, according to the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And the air flow velocity v determines the inner diameter d of the air supply pipeline 1 ；
C. Will supplement the gas tank and the inner diameter d 1 The gas supplementing pipeline is connected with the protruding cavity, and a coal and gas protruding dynamic effect simulation experiment is carried out;
c1, filling granular coal with certain grain diameter density and proportion into the protruding cavity; the air supply tank is filled with a volume V 2 The gas of (3);
c2, vacuumizing the protruding cavity, and filling the protruding cavity with set pressure p after the completion 1 The gas is fully absorbed;
c3, opening a one-way valve on the gas supply pipeline, uniformly filling gas in the gas supply tank into the outburst cavity body through the gas supply pipeline and the gas filling flange, and simulating gas seepage from the coal body in the pressure relief area in the actual coal seam to the outburst coal body;
and c4, carrying out an experiment, observing and recording experimental data.
Further, in the step a1, V 0 ＝π(D 2 L+d 2 1) 4, D-the diameter of the main body of the protruding cavity, mm; l-length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; l-protrusion length, mm;
further, in the step a2, R =1.8886R 0.935 The unit: and m is selected.
Further, in the step a3, V 1 ＝4π(R 3 -r 3 ) (v 3, unit: m is a unit of 3 。
Further, in the step a4, V 2 ＝10V 1 p 1 ω 0 ，p 1 Coal bed gas pressure, unit: MPa; omega 0 Porosity,%.
Further, in said step b1, Q 2 ＝4Q 1 (DL+d1)/d 0 2 ，Q 1 Measured standard coal sample at gas pressure p 1 Gas permeation rate when peak strength is destroyed under the conditions, unit: mL/s; d 0 Standard coal sample diameter, unit: mm;
p-gas pressure p 1 Density of (g), unit: kg/m 3 ；Δp＝0.1atm。
Further, in the step b2,
the invention has the beneficial effects that:
1) The invention provides the gas supplementing tank body and designs the corresponding matched gas supplementing pipe diameter to simulate the gas seepage of the coal body in the pressure relief area to the outburst coal body, so that the gas flows to the outburst coal body under the action of gas pressure gradient and the action of desorbing the gas in the outburst in the pressure relief area for throwing the coal body to do work is fully considered, and the simulated environment is closer to the actual condition and the experimental data is more accurate when the experiment is specifically developed.
2) The invention inflates air through the inflation flange arranged at the rear end of the protruding cavity body, so that the air inflation is uniform and efficient, and meanwhile, the air in the air inflation tank can uniformly inflate the protruding cavity body.
3) The experimental device is exquisite in design, the experimental method is simple and convenient, easy to operate and easy to implement, the experimental simulation environment is more accurate, and the understanding of the prominent mechanism can be further improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of an integrated structure of a coal and gas supply disaster-causing simulation experiment device;
FIG. 2 is an overall view of the inflatable flange;
FIG. 3 is a schematic view of the gas flow of the inflation flange;
FIG. 4 is a schematic diagram of coal bodies in a coal seam and coal bodies in a pressure relief area.
Reference numerals: the air supply device comprises an air supply tank 1, an air supply pipeline 2, a protruding cavity body 3, a protruding port 4, a one-way valve 5, an inflation flange 6, an air inlet 7 and an air outlet 8.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and the specific meaning of the terms described above will be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 3, an experimental apparatus for simulating a coal and gas outburst dynamic effect for gas supply comprises a gas supply tank 1 with a volume of a certain value, the gas supply tank 1 is connected with a gas supply pipeline 2 with an inner diameter, a one-way valve 5 is arranged on the gas supply pipeline 2, the other end of the gas supply pipe is connected with a gas inlet 7 of an inflation flange 6, the inflation flange 6 is provided with a gas outlet, the gas outlet of the inflation flange 6 is uniformly distributed on the side surface of the inflation flange 6, the gas outlet 7 is communicated with an inner cavity of a outburst cavity, the outburst cavity comprises a outburst cavity body 3 and a protruding port 4, the outburst cavity body 3 and the protruding port 4 are both hollow cylinders, one end of the outburst cavity body 3 is connected and sealed with the inflation flange 6, and the other end of the outburst cavity body 3 is connected with the protruding port 4; and the air in the air supplement tank 1 is supplemented with air into the protruding cavity through the air supplement pipeline 2 and the air supplement flange 6.
A simulation experiment method for air-supplemented coal and gas outburst dynamic effect comprises the following steps:
A. determining the maximum air supplement V 2 And the volume V of the air supplementing tank 3 ；V 3 ≥V 2
a1 according to the volume V of the protruding cavity 0 Calculating the equivalent radius r of the outburst coal body in the actual coal seam; v. of 0 ＝π(D 2 L+d 2 1) 4, D-the diameter of the protruding cavity body, mm; l-length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; l-protrusion length, mm;
a2, calculating the equivalent radius R of the coal body of the pressure relief area in the actual coal seam according to the equivalent radius R of the outburst coal body; r =1.8886R 0.935 The unit: m;
a3, calculating the volume V of the coal bodies in the pressure relief area except the protruded coal body 1 ；V 1 ＝4π(R 3 -r 3 ) (v 3, unit: m is 3 ；
a4, calculating the volume V of the free gas of the pressure relief area participating in the outstanding work 2 The maximum air supplement amount is obtained; v 2 ＝10V 1 p 1 ω 0 ，p 1 Coal bed gas pressure, unit: MPa; omega 0 -porosity,%;
B. determination of the internal diameter d of the gas supply line 1 ；
b1, determining the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And an air flow velocity v; q 2 ＝4Q 1 (DL+dl)/d 0 2 ，Q 1 Measured standard coal sample at gas pressure p 1 Gas permeation rate when peak strength is destroyed under the condition, unit: mL/s; d 0 Standard coal sample diameter, unit: mm;
p-gas pressure p 1 Secret of timeDegree, unit: kg/m 3 ；Δp＝0.1atm；
b2, according to the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And the air flow velocity v determines the inner diameter d of the air supply pipeline 1 ；
C. Make up the gas tank and the inner diameter d 1 The gas supplementing pipeline is connected with the outburst cavity, and a coal and gas outburst effect simulation experiment is carried out;
c1, filling granular coal with certain particle size density and proportion into the protruding cavity; the air supply tank is filled with a volume V 2 The gas of (2);
c2, vacuumizing the protruding cavity, and filling the protruding cavity with set pressure p after the completion 1 The gas is fully absorbed; simulating the original gas of the outburst coal;
c3, opening a one-way valve on the gas supply pipeline to enable gas in the gas supply tank to pass through the gas supply pipeline, uniformly filling gas into the outburst cavity body through the gas filling flange, and simulating gas seepage from the coal body in the pressure relief area in the actual coal seam to the outburst coal body;
and c4, carrying out an experiment, observing and recording an experiment result, and finding that the environment simulated by the method is closer to the actual condition, and the motion process and the mechanical characteristics of the coal and the gas in the outburst effect are more accurate after the coal body is unstable.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A simulation experiment method for gas-supplemented coal and gas outburst dynamic effect is characterized in that: the device used by the method comprises an air supplementing tank, wherein the air supplementing tank is connected with an air supplementing pipeline, a one-way valve is arranged on the air supplementing pipeline, the other end of the air supplementing pipeline is connected with an air inlet of an air charging flange, an air outlet is formed in the air charging flange and is communicated with an inner cavity of a protruding cavity, the protruding cavity comprises a protruding cavity body and a protruding opening, one end of the protruding cavity body is connected and sealed with the air charging flange, and the other end of the protruding cavity body is connected with the protruding opening; the gas in the gas supplementing tank is supplemented with gas into the protruding cavity through the gas supplementing pipeline and the gas supplementing flange;
the method comprises the following steps:
A. determining the required maximum air supplement amount V 2 And the volume V of the air supply tank 3 ，V 3 ≥V 2 ；
a1 according to the volume V of the protruding cavity 0 Calculating the equivalent radius r of the outburst coal body in the actual coal seam;
a2, calculating the equivalent radius R of the coal body in the pressure relief area in the actual coal bed according to the equivalent radius R of the outburst coal body;
a3, calculating the volume V of the coal body in the pressure relief area except the outburst coal body 1 ；
a4, calculating the volume of free gas of the pressure relief area participating in the outstanding work, namely the required maximum gas compensation volume V 2 ；
B. Determination of the internal diameter d of the gas supply line 1 ；
b1, determining the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And an air flow velocity v;
b2, according to the gas quantity Q supplemented to the protruding cavity by the gas supplementing tank in unit time 2 And the air flow velocity v determines the inner diameter d of the air supply pipeline 1 ；
C. Make up the gas tank and the inner diameter d 1 The gas supplementing pipeline is connected with the protruding cavity, and a coal and gas protruding dynamic effect simulation experiment is carried out;
c1, filling granular coal with certain particle size density and proportion into the protruding cavity; the air supply tank is filled with air with a volume V 2 The gas of (2);
c2, vacuumizing the protruding cavity, and filling the protruding cavity with set pressure p after the completion 1 In the gas cylinderFully adsorbing;
c3, opening a one-way valve on the gas supply pipeline, uniformly filling gas in the gas supply tank into the outburst cavity body through the gas supply pipeline and the gas filling flange, and simulating gas seepage from the coal body in the pressure relief area in the actual coal seam to the outburst coal body;
and c4, carrying out an experiment, observing and recording experimental data.
2. The experimental method for simulating the coal and gas outburst dynamic effect by supplementing gas as claimed in claim 1, which is characterized in that:
in the step a1, V 0 ＝π(D 2 L+d 2 l)/4, D-diameter of the main body of the protruding cavity, mm; l-length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; i-length of the protrusion, mm;
3. the experimental method for simulating the coal and gas outburst dynamic effect by supplementing gas as claimed in claim 1, which is characterized in that: in the step a2, R =1.8886R 0.935 The unit is: and m is selected.
4. The experimental method for simulating the dynamic effect of the air-supplemented coal and gas outburst as claimed in claim 1, which is characterized in that: in the step a3, V 1 ＝4π(R 3 -r 3 ) (v 3, unit: m is a unit of 3 。
5. The experimental method for simulating the dynamic effect of the air-supplemented coal and gas outburst as claimed in claim 1, which is characterized in that: in the step a4, V 2 ＝10V 1 p 1 ω 0 ，p 1 Coal bed gas pressure, unit: MPa; omega 0 Porosity,%.
6. The coal and gas explosion according to claim 1 with air supplyThe force effect simulation experiment method is characterized in that: in the step b1, Q 2 ＝4Q 1 (DL+d1)/d 0 2 ，Q 1 Measured standard coal sample at gas pressure p 1 Gas permeation rate when peak strength is destroyed under the condition, unit: mL/s; d is a radical of 0 Standard coal sample diameter, unit: mm;
p-gas pressure p 1 Density of (g), unit: kg/m 3 ；Δp＝0.1atm。
7. The experimental method for simulating the dynamic effect of the air-supplemented coal and gas outburst as claimed in claim 1, which is characterized in that: in the step (b 2), the first step,
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