CN113836829A - Air supplement design method in coal and gas outburst dynamic effect simulation experiment - Google Patents
Air supplement design method in coal and gas outburst dynamic effect simulation experiment Download PDFInfo
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- CN113836829A CN113836829A CN202110631138.1A CN202110631138A CN113836829A CN 113836829 A CN113836829 A CN 113836829A CN 202110631138 A CN202110631138 A CN 202110631138A CN 113836829 A CN113836829 A CN 113836829A
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- 239000003245 coal Substances 0.000 title claims abstract description 44
- 230000000694 effects Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000013461 design Methods 0.000 title claims abstract description 12
- 238000004088 simulation Methods 0.000 title claims abstract description 10
- 239000013589 supplement Substances 0.000 title claims description 13
- 230000001502 supplementing effect Effects 0.000 claims abstract description 28
- 229920003169 water-soluble polymer Polymers 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
Abstract
The invention discloses a gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment, which is to determine a set volume gas supplementing tank, and specifically comprises the following steps: obtaining the equivalent radius r of the outburst coal body by utilizing the volume of the outburst cavity, obtaining the equivalent radius and the volume of the coal body of the pressure relief area except the outburst cavity according to r, and obtaining the volume of free gas of the pressure relief area participating in outburst work by combining the porosity of the coal bed on the basis, namely the set volume of the gas supplementing tank; secondly, determining the set air supply pipe diameter: determining the gas supplementing quantity and the gas flow speed to the protruding cavity in unit time, and determining the inner diameter of the gas supplementing pipeline according to the gas flow speed and the gas supplementing quantity. The invention gives the design basis of the sizes of the gas supplementing tank and the gas supplementing pipe diameter on the premise of fully considering the action of the desorbed gas of the pressure-relief coal body around the outburst hole on the outburst, so that the experimental research on the outburst dynamic effect is more perfect.
Description
Technical Field
The invention belongs to the technical field of experiments, and particularly relates to a gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment.
Background
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. 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 outburst dynamic effect research. However, in the process of throwing out which is obviously related to breaking coal, desorption gas in a pressure relief area is involved to different degrees, and the participation of desorption gas in the pressure relief area cannot be ignored. Based on this, it is urgently needed to provide a gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment, so as to research the desorption of gas in a pressure relief area from the experimental angle, and further improve the understanding of the coal and gas outburst dynamic effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the gas supplementing design method in the coal and gas outburst dynamic effect simulation experiment, fully considers the action of the pressure relief coal body around the outburst hole on the outburst, and has positive significance for deeply researching the coal and gas outburst dynamic effect.
A gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment comprises the following steps:
firstly, determining a gas supplementing tank with a set volume V, specifically:
step 1.1, utilizing the volume V of the protruding cavity0Obtaining the equivalent radius r of the protruding coal body; wherein the protruding cavity comprises a protruding cavity body and a protruding opening,
d, protruding cavity body diameter, mm; l is the length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; l-length of the protrusion, mm;
；
step 1.2, obtaining the equivalent radius R of the coal body in the pressure relief area except the protruded cavity according to R; wherein,
；
1.3, obtaining the volume V of the coal body in the pressure relief area except the protruded cavity according to R1； wherein ,
；
step 1.4, gas pressure is combined on the basis of the third step
Porosity of coal bed
Obtaining the volume V of the free gas in the pressure relief area participating in the outstanding work, namely the set volume of the gas supplementing tank; wherein,
；
second, the diameter d of the air supply pipe is set1The determination specifically comprises the following steps:
step 2.1, determining the gas supplementing quantity Q to the protruding cavity in unit time2And an air flow velocity v; wherein,
，Q1-measuring the pressure of the standard coal sample in the gas
Gas permeation speed when peak strength is damaged under the condition; mL/s; d0-standard coal sample diameter, mm; velocity of air flow
；
-gas pressure
The density of the water-soluble polymer (II),
；
get
；
Step 2.2, supplementing gas quantity Q to the protruding cavity in unit time according to the air flow speed v and the gas supplementing tank2Determination of the internal diameter d of the gas supply line1； wherein ,
；
and thirdly, manufacturing the air supply tank and the air supply pipe according to the first step and the second step.
The invention has the following beneficial effects:
1) the invention gives the design basis of the sizes of the gas supplementing tank and the gas supplementing pipe diameter on the premise of fully considering the action of the desorbed gas of the pressure-relief coal body around the outburst hole on the outburst, so that the experimental research on the outburst dynamic effect is more perfect.
2) The invention inflates air through the inflation flange arranged at the rear end of the main body of the protruding cavity, so that the inflation is uniform and efficient, and meanwhile, the air in the air inflation tank can be uniformly inflated to the protruding cavity.
3) By means of the design method of the invention, corresponding experimental devices are manufactured and relevant researches are carried out, and the understanding of the coal and gas outburst dynamic effect can be further improved.
Drawings
FIG. 1 is an overall view of an inflatable flange according to the present invention;
FIG. 2 is a schematic diagram of an overall configuration of an air supply device for a coal and gas outburst dynamic effect simulation experiment according to the present invention;
the gas supply device comprises a gas supply tank 1, a gas supply pipeline 2, a gas charging flange 3, a one-way valve 4, a protruding cavity body 5 and a protruding opening 6.
Detailed Description
To fully illustrate the features and advantages of the present invention, reference will now be made in detail to the following examples.
A gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment comprises the following steps:
firstly, determining a gas supplementing tank with a set volume V, specifically:
step 1.1, utilizing the volume V of the protruding cavity0Obtaining the equivalent radius r of the protruding coal body; wherein the protruding cavity comprises a protruding cavity body and a protruding opening,
d, protruding cavity body diameter, mm; l is the length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; l-length of the protrusion, mm;
；
step 1.2, obtaining the equivalent radius R of the coal body in the pressure relief area except the protruded cavity according to R; wherein,
；
1.3, obtaining the volume V of the coal body in the pressure relief area except the protruded cavity according to R1； wherein ,
；
step 1.4, combining gas on the basis of the third stepPressure of
Porosity of coal bed
Obtaining the volume V of the free gas in the pressure relief area participating in the outstanding work, namely the set volume of the gas supplementing tank; wherein,
；
second, the diameter d of the air supply pipe is set1The determination specifically comprises the following steps:
step 2.1, determining the gas supplementing quantity Q to the protruding cavity in unit time2And an air flow velocity v; wherein,
，Q1-measuring the pressure of the standard coal sample in the gas
Gas permeation speed when peak strength is damaged under the condition; mL/s; d0-standard coal sample diameter, mm; velocity of air flow
；
-gas pressure
The density of the water-soluble polymer (II),
；
get
；
Step 2.2, supplementing gas quantity Q to the protruding cavity in unit time according to the air flow speed v and the gas supplementing tank2Determination of the internal diameter d of the gas supply line1； wherein ,
；
and thirdly, manufacturing the air supply tank and the air supply pipe according to the first step and the second step.
The device utilized by the method comprises an air supplement tank 1 with a set volume V and an air supplement pipeline 2 which connects the air supplement tank 1 and a protruding cavity and has a set pipe diameter; the utility model discloses a high pressure resistant high strength metal tank body, air supplement tank 1 is high pressure resistant high strength metal tank body, outstanding cavity divide into outstanding cavity main part 5 and outstanding mouth 6, outstanding cavity main part 5 and outstanding mouth 6 are hollow cylinder, the rear end of outstanding cavity is sealed and is equipped with inflatable flange 3, check valve 4 has been installed to air supplement pipeline 2, and when pressure in the outstanding cavity was less than 1 pressure of air supplement tank, the air supplement tank was gaseous through air supplement pipeline 2 through inflatable flange 3 entering outstanding cavity and realize the tonifying qi.
Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (1)
1. A gas supplementing design method in a coal and gas outburst dynamic effect simulation experiment is characterized by comprising the following steps: comprises a method for obtaining the set volume V of the air supplement tank and the set pipe diameter d of the air supplement pipeline1The method of (1);
the method for calculating the set volume V of the air supplement tank comprises the following steps:
s1.1, obtaining the equivalent radius of the protruding coal body by using the volume of the protruding cavity; wherein,
d is the diameter of the main body of the protruding cavity,mm; l is the length of the protruding cavity body, mm; d-diameter of the protrusion opening, mm; l-length of the protrusion, mm;
；
s1.2-obtaining the equivalent radius R of the coal body in the pressure relief area except the protruded cavity according to R; wherein,
；
s1.3-obtaining the volume V of the coal body in the pressure relief area except the protruded cavity according to R and R1； wherein ,
；
s1.4-combining the coal seam gas pressure and the porosity to obtain the volume of free gas in the pressure relief area participating in the outstanding work, namely the set volume of the gas supplementing tank (1); wherein,
；
wherein the pipe diameter d1The obtaining method comprises the following steps:
s2.1-determining gas quantity Q supplemented to the protruding cavity in unit time2And an air flow velocity v; wherein,
，Q1-actually measuring the gas permeation rate of a standard coal sample when the peak strength is destroyed under the gas pressure condition; mL/s; d0-standard coal sample diameter, mm; velocity of air flow
；
-gas pressure
The density of the water-soluble polymer (II),
；
get
；
S2.2-supplementing gas quantity Q to the protruding cavity in unit time according to air flow speed v and gas supplementing tank2Determination of the internal diameter d of the gas supply line1； wherein ,
；
the air supply tank and the air supply pipe are manufactured according to the first step and the second step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110631138.1A CN113836829B (en) | 2021-06-07 | 2021-06-07 | Air supplementing design method in coal and gas outburst power effect simulation experiment |
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| CN202110631138.1A CN113836829B (en) | 2021-06-07 | 2021-06-07 | Air supplementing design method in coal and gas outburst power effect simulation experiment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358846A (en) * | 2021-06-11 | 2021-09-07 | 中煤科工集团重庆研究院有限公司 | Gas-supplementing coal and gas outburst dynamic effect simulation experiment device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134448A (en) * | 2013-01-29 | 2013-06-05 | 河南理工大学 | Test method of drill hole gas extraction effective radius |
| CN106680451A (en) * | 2015-11-09 | 2017-05-17 | 河南理工大学 | Underground rapid measurement method for coal and gas outburst parameter as well as apparatus thereof |
| CN111272970A (en) * | 2020-01-21 | 2020-06-12 | 中煤科工集团重庆研究院有限公司 | Coal and gas outburst simulation similarity ratio determination and inversion reduction analysis method |
| JP2021085634A (en) * | 2019-11-29 | 2021-06-03 | 三菱パワー株式会社 | Solid fuel crushing system and electric power generating plant comprising the same as well as control method for solid fuel crushing system |
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- 2021-06-07 CN CN202110631138.1A patent/CN113836829B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134448A (en) * | 2013-01-29 | 2013-06-05 | 河南理工大学 | Test method of drill hole gas extraction effective radius |
| CN106680451A (en) * | 2015-11-09 | 2017-05-17 | 河南理工大学 | Underground rapid measurement method for coal and gas outburst parameter as well as apparatus thereof |
| JP2021085634A (en) * | 2019-11-29 | 2021-06-03 | 三菱パワー株式会社 | Solid fuel crushing system and electric power generating plant comprising the same as well as control method for solid fuel crushing system |
| CN111272970A (en) * | 2020-01-21 | 2020-06-12 | 中煤科工集团重庆研究院有限公司 | Coal and gas outburst simulation similarity ratio determination and inversion reduction analysis method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358846A (en) * | 2021-06-11 | 2021-09-07 | 中煤科工集团重庆研究院有限公司 | Gas-supplementing coal and gas outburst dynamic effect simulation experiment device and method |
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