CN105046037A - Method determining goaf ignition process - Google Patents
Method determining goaf ignition process Download PDFInfo
- Publication number
- CN105046037A CN105046037A CN201510043011.2A CN201510043011A CN105046037A CN 105046037 A CN105046037 A CN 105046037A CN 201510043011 A CN201510043011 A CN 201510043011A CN 105046037 A CN105046037 A CN 105046037A
- Authority
- CN
- China
- Prior art keywords
- oxygen
- particle
- goaf
- coal
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses a method determining a goaf ignition process; the features are that a model using a grain flow theory is provided, and the model can learn about temperature and temperature rise zone changes at different times in a U-shape ventilation lower goaf residual coal seam nature ignition process; the method comprises the following steps: basic model establishment; correlation parameter arrangement; residual coal ignition microscopic model construction; result analysis. The method can be applied to analyze a goaf spontaneous combustion generation position and a development process.
Description
Technical field
The present invention relates to Mineral Engineering, particularly relate to and analyze Study on Protection of Spontaneous Combustion position and evolution.
Background technology
Pit mining is one of major way of coal production, may leave and lose coal seam after back production, and loses coal seam due to oxidation and may produce spontaneous combustion.In recent years, along with Sub-Level Caving technology is popularized, the top coals' recovery ratio at face-end support place was on the low side, and cause losing coal in goaf more, spontaneous combustion in goaf hazard level progressively increases.Although visible for the type spontaneous combustion and temperature-rise period thereof to start further investigation, the effect reached is unsatisfactory.The domestic mine of nearly 56% has spontaneous combustion hidden danger according to statistics, far away unnecessary other countries, and goaf is that spontaneous combustion disaster region the most frequently occurs.
For this problem, several direction is had to be studied at present.1) by reality, something lost coal seam temperature and intensification region thereof are measured, carry out matching and parametric inversion in conjunction with related physical parameter, obtain analytic expression in a certain respect.Such analytical approach clear thinking, is convenient to theoretical research, but cannot carry out complicated coupling analysis, also cannot instantiation modeling.2) based on the research of fluid aspect, studied by relations such as gas temperatures, use the fluid simulation softwares such as fluent.But analysis also has problems like this, such as how to control the heat interchange between solid and fluid, how heat is propagated in solids.3) use continuity ground software simulation, most ground simulation softward provides thermodynamic model, to study the impact heated up on solid ess-strain.But how gas affects solid thermal transmission, in rock cranny, how air-flow is simulated and is also had problems.
For selecting a kind of method of this problem of solution newly, attempt using the PFC3D based on particle flow theory, oxygen equivalence is become particle to infiltrate and lose the particle of coal, simulation coal and oxygen reaction the evolution of heat, thus obtain warm field distribution and feature thereof in the Residual coal in goaf in spontaneous fire process.Long-time monitoring is carried out to this goaf simultaneously, according to temperature and intensification regional change thereof, model has been revised.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method determining goaf ignition process, effectively the above-mentioned problems in the prior art can be solved.
For achieving the above object, the technical solution used in the present invention is as follows:
Determine a method for goaf ignition process,
it is characterized in that , for understanding under U-shaped ventilation in Residual coal in goaf layer spontaneous fire process, the temperature of different time and the change of heating zone, propose to use the model based on particle flow theory;
it comprises the steps : basic model is set up, relative parameters setting, loses the meso-mechanical model structure that coal is got angry, interpretation of result;
the present invention can be used for analyze heterogeneous goaf and send out position and evolution.
In the above-mentioned methods, basic model initial point is goaf, the lower left corner (O point), X-direction from left to right (laterally, 300m), Y direction from top to bottom (longitudinally, 200m), the setting for coal particle: the friction factor of particle is 0.3, the density of coal is 1400kg/m
3, elastic modulus and modulus of shearing are 3.5 × 10
8pa, particle radius scope [0.05m, 0.075m], porosity 0.3.
In the above-mentioned methods, relative parameters setting is: gas law constant R
s/ (Jmol
-1k
-1)=8.314; Aerodynamic force viscosity coefficient μ/kg/ (ms)=1.8 × 10
-5; Oxygen diffusion coefficient D/m
2/ s=1.5 × 10
-5; Activation energy
a/ (Jmol
-1)=5 × 10
4; Coal coefficient of heat conductivity λ
s/ (Jmol
-1k
-1)=0.2; Thermal discharge Δ Q/ (Jmol
-1)=4.2 × 10
4; Lose coal osmotic coefficient k/m
2=8 × 10
-7; The thermal linear expansion coefficient α/(K of coal
-1)=3.0 × 10
-6; The specific heat at constant volume C of coal
v/ (Jkg
-1k
-1)=1100; Model is in standard state.
In the above-mentioned methods, the meso-mechanical model losing coal ignition builds and comprises: the process oxygen in air being equivalent in proportion particle, simulation the oxygen flowing in goaf, coal particle and oxygen particle reaction oxygen consumed.
In the above-mentioned methods, the oxygen in air is equivalent in proportion the process of particle, under standard state, 1mol gas=22.4L, so 1m
3=44.64mol, O
2concentration=44.64 × 21% × 32=0.3kg/m
3; Because the thick 0.5m of model, if 1m
3100 oxygen particles are had, O in gas model
2granule density=1m × 1m × 0.3kg/m
3× 0.5m/100=0.0015kg/m
2=0.0469mol; The density (removing the buoyancy of air to oxygen) of oxygen relative atmospheric is 3g/mol, each O
2the relative mass of particle is 0.0469mol/ × 3g/mol/1000=1.407 × 10
-4kg; In order to oxygen fully spreads in dump, if oxygen particle radius R
o2=0.003m, then density=1.407 × 10 of ball
-4(kg)/(4/3 π R
o2 3)=3.9kg/m
3.
In the above-mentioned methods, the flowing of simulation oxygen in goaf is realized by FISH, to pass through air intake opening and gas outlet two point in goaf, and the second-degree parabola in structure goaf, the movement locus of simulation air-flow in goaf, thus be oxygen particle applying velocity; Simultaneously for simulation air-flow takes away the phenomenon of coal seam heat, the reduction air-flow be directly proportional to velocity, through the temperature value of region coal particle, realizes simulation.
In the above-mentioned methods, the flowing of oxygen in something lost coal is resolved into vertical direction and horizontal direction, respectively as P/ x=(-μ/k) u(1) and P/ y=(-μ/k) v+ Δ ρ g (1-T
α/ T) shown in (2), the Boltzman transport equation Boltzmann of oxygen as ε (c/ t)+(uc)/x+ (uc/ y)=D (
2u/ x
2+
2v/ y
2)-(1-ε) R(3) shown in.
In the above-mentioned methods, coal particle and oxygen particle reaction oxygen consumed are realized by FISH, in this process due to reaction, suppose that coal particle and oxygen particle exterior surface distance are less than or equal to R
o2time, react and release heat, after deleting oxygen particle, causing local oxygen concentration to reduce, impelling oxygen particle to produce motion, reacting the chemical equation followed carbon and oxygen and react.
Embodiment
Below with reference to embodiment, technical scheme of the present invention is described in further detail.
engineering background and parameter
Certain colliery is in Liaoning and mobilizes troop mountain within the border, and the mine field total area is approximately 23.0432km
2, its East and West direction length is about 4200m, and North and South direction is about 5350m.Its 18305 actual mining face length 200m, mining height 4.8m.The spontaneous combustion in goaf numerical simulation under U-shaped ventilation is now carried out for this workplace.The goaf degree of depth gets 300m, and the normal fltting speed of workplace is about 5 °, 3.6m/d, ventilation resistance 58Pa, inclination angle, workplace maximum quantity of wind 700 ~ 810m
3/ min, EAT is 19 DEG C, and primitive rock temperature is 21.7 DEG C, and losing coal all thick during normal propelling is 1m.Model initial point is goaf, the lower left corner (O point), and X-direction is (laterally, 300m) from left to right, and Y direction is (longitudinally, 200m) from top to bottom.Setting for coal particle: the friction factor of particle is 0.3, the density of coal is 1400kg/m
3, elastic modulus and modulus of shearing are 3.5 × 10
8pa, particle radius scope [0.05m, 0.075m], porosity 0.3.
The correlation parameter value that the present invention uses is as follows:
Gas law constant R
s/ (Jmol
-1k
-1)=8.314; Aerodynamic force viscosity coefficient μ/kg/ (ms)=1.8 × 10
-5; Oxygen diffusion coefficient D/m
2/ s=1.5 × 10
-5; Activation energy
a/ (Jmol
-1)=5 × 10
4; Coal coefficient of heat conductivity λ
s/ (Jmol
-1k
-1)=0.2; Thermal discharge Δ Q/ (Jmol
-1)=4.2 × 10
4; Lose coal osmotic coefficient k/m
2=8 × 10
-7; The thermal linear expansion coefficient α/(K of coal
-1)=3.0 × 10
-6; The specific heat at constant volume C of coal
v/ (Jkg
-1k
-1)=1100; Model is in standard state.
the meso-mechanical model losing coal ignition builds and interpretation of result
For solving the simulation of losing coal seam ignition temperature-rise period, model should be able to solve following three problems.
1) oxygen in air is equivalent in proportion the process of particle: under standard state, 1mol gas=22.4L, so 1m
3=44.64mol, O
2concentration=44.64 × 21% × 32=0.3kg/m
3.Because the thick 0.5m of model, if 1m
3100 oxygen particles are had, O in gas model
2granule density=1m × 1m × 0.3kg/m
3× 0.5m/100=0.0015kg/m
2=0.0469mol.The density (removing the buoyancy of air to oxygen) of oxygen relative atmospheric is 3g/mol, each O
2the relative mass of particle is 0.0469mol/ × 3g/mol/1000=1.407 × 10
-4kg.In order to oxygen fully spreads in dump, if oxygen particle radius R
o2=0.003m, then density=1.407 × 10 of ball
-4(kg)/(4/3 π R
o2 3)=3.9kg/m
3.
2) simulate the flowing of oxygen in goaf to be realized by FISH, to pass through air intake opening and gas outlet two point in goaf, second-degree parabola in structure goaf as the movement locus of para-curve simulation air-flow in goaf, thus is oxygen particle applying velocity.Simultaneously for simulation air-flow takes away the phenomenon of coal seam heat, the reduction air-flow be directly proportional to velocity, through the temperature value of region coal particle, realizes above-mentioned simulation.The flowing of oxygen in something lost coal is resolved into vertical direction and horizontal direction, respectively such as formula shown in (1) and formula (2).The Boltzman transport equation Boltzmann of oxygen as the formula (3).
P/ x=(-μ/k) u(1) and P/ y=(-μ/k) v+ Δ ρ g (1-T
α/ T) shown in (2), the Boltzman transport equation Boltzmann of oxygen as ε (c/ t)+(uc)/x+ (uc/ y)=D (
2u/ x
2+
2v/ y
2)-(1-ε) R(3)
P/?x=(-μ/k)u（1）
In formula: P is pressure, Pa; Aerodynamic force viscosity coefficient, kg/ (ms); K loses coal infiltration coefficient, m
2.
P/?y=(-μ/k)v+Δρg(1-T
α/T)（2）
In formula:
vfor losing coal inner vertical direction wind speed, m/s; Δ ρ is the relative density of oxygen to air, kg/m
3; G is acceleration of gravity, m/s
2;
t a,
tbe respectively and lose coal outside and the temperature of self, K.
ε(?c/?t)+?(uc)/?x+?(uc/?y)=D(?
2u/?x
2+?
2v/?y
2)-(1-ε)R（3）
In formula: t is computing time, s; ε is for losing coal porosity, %; D is oxygen diffusion coefficient, m
2/ s; R is oxygen wear rate, mol/ (m
3s).
3) coal particle and oxygen particle reaction oxygen consumed are realized by FISH, in this process due to reaction, suppose that coal particle and oxygen particle exterior surface distance are less than or equal to R
o2time, react and release heat.Cause local oxygen concentration to reduce after deleting oxygen particle, impel oxygen particle to produce motion.The chemical equation that carbon and oxygen react is followed in reaction.
The Residual coal in goaf layer temperature that method obtains and changes in distribution as follows:
1) development time: 7 days, maximum temperature: 296.5K, region: X ∈ (200m, 220m) Y ∈ (50m, 95m), analyzes initial position and shape and ventilation, to lose coal thickness etc. relevant.
2) development time: 15 days, maximum temperature: 298.1K, region: X ∈ (200m, 225m) Y ∈ (50m, 110m), analyzes: through the accumulation of heat, facilitate the generation of oxidation reaction, heating zone is along air motion Directional Extension.In heating zone, two closed isotherm spacing are substantially identical, illustrate that oxidation is more stable in all directions linear increase.
3) development time: 22 days, maximum temperature: 301.9K, region: X ∈ (200m, 235m) Y ∈ (50m, 125m), analyzes: heating zone change is little, but temperature rises very fast, and heating zone epimere region is tightened up into tip-shape, lower end then continues to expand.Lose coal and oxygen accelerated reaction, heating zone lower end oxygen is denseer to be developed, and it is slower that heating zone epimere oxygen concentration reduces development.Oxidation is relatively more violent, and heating zone is different in individual direction growth rate.
4) development time: 27 days, maximum temperature: 304K, region: X ∈ (200m, 250m) Y ∈ (50m, 125m), analyzes: heating zone longitudinal development is relatively slower, and crosswise development is very fast.Reason is not enough along air motion direction oxygen, and accumulation heat spreads to surrounding, obtains more sufficient oxygen with distinguished and admirable vertical direction, and then oxidation makes heating zone extending transversely.Oxidation heats up still violent, but tends to be steady gradually.
5) development time: 31 days, maximum temperature: 306.1K, region: X ∈ (200m, 270m) Y ∈ (50m, 150m), analyzes: vertical and horizontal speed of development is all fast, and longitudinal development is greater than crosswise development.The perpendicular contact scope of oxygen stream increases, and defines new longitudinal oxygen supply passage.Make the region being in oxygen airflow downstream obtain oxygen to heat up, heating zone epimere is longitudinally developed.The oxidation programming rate regional stability of its all directions.。
6) development time: 35 days, maximum temperature: 308K, region: X ∈ (200m, 300m) Y ∈ (50m, 150m), analyzes: heating zone Longitudinal Extension stops.Distinguished and admirablely be assumed to be para-curve, the oxygen through coboundary, goaf and lower boundary is less, is not enough to supply oxidation temperature reaction.The goaf development of heating zone after 300m is also less.
Said process can be divided into three phases, and the first stage is the period before 22 days, and this heating zone development in period is relatively slower, and temperature-rise period is stablized, regular shape, and oxygen supply is sufficient; Subordinate phase is during 22 days to 35 days, and during this, the development of heating zone is relatively more violent, and due to oxygen supply problem, the heating zone speed of development of all directions is different, is generally first longitudinally laterally longitudinal more again development pattern; Phase III is after 35 days, and heating zone ambient oxygen feed consistency reaches the limit of balance, and heating zone scope stops development, system balancing.
Claims (8)
1. determine that the method for process is got angry in goaf, it is characterized in that, for understanding under U-shaped ventilation in Residual coal in goaf layer spontaneous fire process, the temperature of different time and the change of heating zone, propose to use the model based on particle flow theory; It comprises the steps: that basic model is set up, relative parameters setting, loses the meso-mechanical model structure that coal is got angry, interpretation of result; The present invention can be used for analyzing Study on Protection of Spontaneous Combustion position and evolution.
2. the method determining goaf ignition process according to claim 1, it is characterized in that, described basic model initial point is goaf, the lower left corner (O point), X-direction from left to right (laterally, 300m), Y direction from top to bottom (longitudinally, 200m), setting for coal particle: the friction factor of particle is 0.3, the density of coal is 1400kg/m
3, elastic modulus and modulus of shearing are 3.5 × 10
8pa, particle radius scope [0.05m, 0.075m], porosity 0.3.
3. the method determining goaf ignition process according to claim 1, it is characterized in that, described relative parameters setting is: gas law constant R
s/ (Jmol
-1k
-1)=8.314; Aerodynamic force viscosity coefficient μ/kg/ (ms)=1.8 × 10
-5; Oxygen diffusion coefficient D/m
2/ s=1.5 × 10
-5; Activation energy
a/ (Jmol
-1)=5 × 10
4; Coal coefficient of heat conductivity λ
s/ (Jmol
-1k
-1)=0.2; Thermal discharge Δ Q/ (Jmol
-1)=4.2 × 10
4; Lose coal osmotic coefficient k/m
2=8 × 10
-7; The thermal linear expansion coefficient α/(K of coal
-1)=3.0 × 10
-6; The specific heat at constant volume C of coal
v/ (Jkg
-1k
-1)=1100; Model is in standard state.
4. the method determining goaf ignition process according to claim 1, it is characterized in that, the meso-mechanical model losing coal ignition builds and comprises: the process oxygen in air being equivalent in proportion particle, simulation the oxygen flowing in goaf, coal particle and oxygen particle reaction oxygen consumed.
5. the method determining goaf ignition process according to claim 4, it is characterized in that, the oxygen in air is equivalent in proportion the process of particle, under standard state, 1mol gas=22.4L, so 1m
3=44.64mol, O
2concentration=44.64 × 21% × 32=0.3kg/m
3; Because the thick 0.5m of model, if 1m
3100 oxygen particles are had, O in gas model
2granule density=1m × 1m × 0.3kg/m
3× 0.5m/100=0.0015kg/m
2=0.0469mol; The density (removing the buoyancy of air to oxygen) of oxygen relative atmospheric is 3g/mol, each O
2the relative mass of particle is 0.0469mol/ × 3g/mol/1000=1.407 × 10
-4kg; In order to oxygen fully spreads in dump, if oxygen particle radius R
o2=0.003m, then density=1.407 × 10 of ball
-4(kg)/(4/3 π R
o2 3)=3.9kg/m
3.
6. the method determining goaf ignition process according to claim 4, it is characterized in that, the flowing of simulation oxygen in goaf is realized by FISH, to pass through air intake opening and gas outlet two point in goaf, second-degree parabola in structure goaf, the movement locus of simulation air-flow in goaf, thus be oxygen particle applying velocity; Simultaneously for simulation air-flow takes away the phenomenon of coal seam heat, the reduction air-flow be directly proportional to velocity, through the temperature value of region coal particle, realizes simulation.
7. the method determining goaf ignition process according to claim 4, is characterized in that, the flowing of oxygen in something lost coal is resolved into vertical direction and horizontal direction, respectively as μ/k) u(1) and μ/k) v+ Δ ρ g (1-T
α/ T) shown in (2), the Boltzman transport equation Boltzmann of oxygen as
ε (c/ t)+(uc)/x+ (uc/ y)=D (
2u/ x
2+
2v/ y
2)-(1-ε) R(3) shown in.
8. the method determining goaf ignition process according to claim 4, it is characterized in that, coal particle and oxygen particle reaction oxygen consumed are realized by FISH, in this process due to reaction, suppose that coal particle and oxygen particle exterior surface distance are less than or equal to R
o2time, react and release heat, after deleting oxygen particle, causing local oxygen concentration to reduce, impelling oxygen particle to produce motion, reacting the chemical equation followed carbon and oxygen and react.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510043011.2A CN105046037A (en) | 2015-01-28 | 2015-01-28 | Method determining goaf ignition process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510043011.2A CN105046037A (en) | 2015-01-28 | 2015-01-28 | Method determining goaf ignition process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105046037A true CN105046037A (en) | 2015-11-11 |
Family
ID=54452578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510043011.2A Pending CN105046037A (en) | 2015-01-28 | 2015-01-28 | Method determining goaf ignition process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105046037A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812550A (en) * | 2017-02-15 | 2017-06-09 | 淮南矿业(集团)有限责任公司 | A kind of fully-mechanized mining working crosses the method that major fault prevents and treats Period of Coal Seam Spontaneous Combustion |
| CN113670980A (en) * | 2021-07-26 | 2021-11-19 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN114496104A (en) * | 2022-04-02 | 2022-05-13 | 中国矿业大学(北京) | Method and system for evaluating spontaneous combustion degree of residual coal in goaf under coal mining condition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7043325B1 (en) * | 2005-03-01 | 2006-05-09 | Advanced Micro Devices, Inc. | Method and apparatus for determining product-specific error and tool drift |
| CN103198362A (en) * | 2013-03-19 | 2013-07-10 | 辽宁工程技术大学 | Method for coal mine safety evaluation |
| CN103675227A (en) * | 2013-12-04 | 2014-03-26 | 陈善乐 | Method for stimulating goaf ignition process under U-shaped ventilation |
-
2015
- 2015-01-28 CN CN201510043011.2A patent/CN105046037A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7043325B1 (en) * | 2005-03-01 | 2006-05-09 | Advanced Micro Devices, Inc. | Method and apparatus for determining product-specific error and tool drift |
| CN103198362A (en) * | 2013-03-19 | 2013-07-10 | 辽宁工程技术大学 | Method for coal mine safety evaluation |
| CN103675227A (en) * | 2013-12-04 | 2014-03-26 | 陈善乐 | Method for stimulating goaf ignition process under U-shaped ventilation |
Non-Patent Citations (1)
| Title |
|---|
| 刘伟等: ""Y"型通风下采空区自然发火数值模拟", 《辽宁工程技术大学学报（自然科学版）》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812550A (en) * | 2017-02-15 | 2017-06-09 | 淮南矿业(集团)有限责任公司 | A kind of fully-mechanized mining working crosses the method that major fault prevents and treats Period of Coal Seam Spontaneous Combustion |
| CN113670980A (en) * | 2021-07-26 | 2021-11-19 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN113670980B (en) * | 2021-07-26 | 2023-09-01 | 中煤科工集团沈阳研究院有限公司 | Method for determining shortest natural ignition period of coal |
| CN114496104A (en) * | 2022-04-02 | 2022-05-13 | 中国矿业大学(北京) | Method and system for evaluating spontaneous combustion degree of residual coal in goaf under coal mining condition |
| CN114496104B (en) * | 2022-04-02 | 2022-06-28 | 中国矿业大学(北京) | Method and system for evaluating spontaneous combustion degree of residual coal in goaf under coal mining condition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| An et al. | Effects of building concave structure on flame spread over extruded polystyrene thermal insulation material | |
| Jie et al. | Experimental investigation on influence of smoke venting velocity and vent height on mechanical smoke exhaust efficiency | |
| CN103675227B (en) | Method for stimulating goaf ignition process under U-shaped ventilation | |
| Huang et al. | Modeling of gas flow and temperature fields in underground coal fires | |
| Liu et al. | 3-D simulation of gases transport under condition of inert gas injection into goaf | |
| CN104563992B (en) | Underground coal gasification system and control method | |
| Zhang et al. | Dust-suppression and cooling effects of spray system installed between hydraulic supports in fully mechanized coal-mining face | |
| CN105046037A (en) | Method determining goaf ignition process | |
| Hao et al. | Bulking factor of the strata overlying the gob and a three-dimensional numerical simulation of the air leakage flow field | |
| Li et al. | Impact of the water evaporation on the heat and moisture transfer in a high-temperature underground roadway | |
| Zhang et al. | The cooling effect of high geothermal tunnel construction environment: A case of ice and spray method in an extra-long tunnel | |
| An et al. | Influence of cable inclination angle and longitudinal ventilation on temperature distribution during cable fire in utility tunnel | |
| Hongqing et al. | Theoretical investigation on the relationship between tail roadway methane drainage and distribution of easily spontaneous combustible region in gob | |
| Gao et al. | Investigation of coupled control of gas accumulation and spontaneous combustion in the goaf of coal mine | |
| Nie et al. | Analysis of multi-factor ventilation parameters for reducing energy air pollution in coal mines | |
| Gu et al. | Spontaneous combustion of coal in regenerated roof and its prevention technology | |
| Nie et al. | Study of highly efficient control and dust removal system for double-tunnel boring processes in coal mines | |
| Zhang et al. | The coupled cooling effect of ventilation and spray in the deep-buried high-temperature tunnel | |
| Wang et al. | The impact of the backfill direction on the backfill cooling performance using phase change materials in mine cooling | |
| CN104614502A (en) | Simulation method for goaf ignition process under the condition of U-shaped ventilation | |
| Wang et al. | Multistage cooling system for temperature reduction of the working face in deep coal mines: a technical-economic evaluation | |
| Chen et al. | Ventilation and cooling of coal mining face based on CFD model optimization | |
| Atreya et al. | A model of opposed-flow flame spread over charring materials | |
| Song et al. | Multifield Coupled Dynamic Simulation of Coal Oxidation and Self‐Heating in Longwall Coal Mine Gob | |
| Xu et al. | Analysis on the influence of the smoke block board on the entrainment phenomena near a mechanical exhaust vent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151111 |
|
| WD01 | Invention patent application deemed withdrawn after publication |