CN107832520B - Evaluation method for natural gas explosion high-temperature disasters in tunnel - Google Patents
Evaluation method for natural gas explosion high-temperature disasters in tunnel Download PDFInfo
- Publication number
- CN107832520B CN107832520B CN201711065904.2A CN201711065904A CN107832520B CN 107832520 B CN107832520 B CN 107832520B CN 201711065904 A CN201711065904 A CN 201711065904A CN 107832520 B CN107832520 B CN 107832520B
- Authority
- CN
- China
- Prior art keywords
- natural gas
- tunnel
- temperature
- length
- gathering area
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
Landscapes
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Computer Hardware Design (AREA)
- Economics (AREA)
- Theoretical Computer Science (AREA)
- Strategic Management (AREA)
- Physics & Mathematics (AREA)
- Entrepreneurship & Innovation (AREA)
- General Physics & Mathematics (AREA)
- Tourism & Hospitality (AREA)
- Development Economics (AREA)
- Operations Research (AREA)
- Marketing (AREA)
- General Business, Economics & Management (AREA)
- Game Theory and Decision Science (AREA)
- Quality & Reliability (AREA)
- Educational Administration (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a method for evaluating natural gas explosion high-temperature disasters in a tunnel, which is characterized in that a quantitative relation model of the maximum temperature value of any point on a natural gas explosion propagation path in the tunnel, the length of a natural gas gathering area in the tunnel and the distance between the point and an ignition source is established, so that the maximum temperature value of any position on the propagation path of the natural gas explosion in the tunnel is accurately obtained, and the high-temperature disasters are quickly and accurately judged.
Description
Technical Field
The invention relates to the field of natural gas explosion disaster assessment, in particular to a method for assessing natural gas explosion high-temperature disasters in a tunnel.
Background
Natural gas is a high-quality and efficient energy source, and is also a typical explosion hazard source. In addition to long transmission pipelines, containers such as storage tanks and compressed gas cylinders are often used for road transportation by vehicles after being stored. During road transportation, once natural gas in the container leaks, the natural gas and air can be mixed to form explosive mixed gas, and natural gas explosion accidents can happen when the natural gas meets an ignition source.
Natural gas is much less dense than air, natural gas is not easy to gather even if it leaks in a relatively open space, and even if it explodes, the explosion strength is generally low due to the lack of a constraint structure, so the risk of natural gas leakage explosion in the open space is relatively low, however, after natural gas leakage occurs in a relatively limited space such as some tunnels, underground warehouses, kitchens, etc., the leaked gas is difficult to be quickly discharged, and then is mixed with air and gathered together to form explosive mixed gas, and the structure of the limited space has an enhancing effect on natural gas explosion, so a large explosion risk is brought. Containers such as natural gas storage tanks and gas cylinders often pass through highway tunnels during transportation. The tunnel is a typical limited space, and in recent years, a plurality of serious and extremely large traffic accidents occur in the highway tunnel in China. Once natural gas leakage is caused by traffic accidents of natural gas transport vehicles in the tunnel, natural gas explosion accidents are likely to be accumulated in the tunnel and caused, and huge casualties and property loss are caused.
High temperature is one of the main causes of natural gas explosion accidents. The high temperatures generated by natural gas explosions can reach thousands of degrees celsius, which can cause serious burns and even death to personnel. However, the focus of the various documents, data and technical achievements on natural gas explosion disaster-causing factors is on the overpressure of shock waves generated by explosion, and sufficient attention is not paid to high-temperature disasters generated by explosion. At present, a quantitative evaluation method for natural gas explosion high-temperature disasters in tunnels is still lacked, so that accurate prediction and evaluation of accidents are influenced. Obviously, the method for accurately and quickly evaluating the natural gas explosion high-temperature disasters in the tunnel has important significance for risk evaluation, emergency rescue and accident investigation and analysis of accidents.
Disclosure of Invention
In order to solve the problems, the invention provides a method for evaluating natural gas explosion high-temperature disasters in a tunnel, which can quickly evaluate and predict a high-temperature damage area possibly caused by explosion of an ignition source when natural gas leakage occurs in a closed tunnel at one end.
In order to achieve the purpose, the invention adopts the technical scheme that:
a quantitative relation model of the maximum temperature value of any point on a natural gas explosion propagation path in a tunnel, the length of a natural gas gathering area in the tunnel and the distance between the point and an ignition source is established, so that the maximum temperature value of any position on the propagation path of the natural gas in the tunnel after explosion is accurately obtained, and the rapid and accurate judgment of high-temperature disasters is realized; the method specifically comprises the following steps:
through the grasped accident site related data, including the length of the natural gas gathering area in the tunnel, the specific position of the natural gas gathering area in the tunnel is evaluated, and the evaluation position is judged to be (0, L)m)、(Lm，Lc)、(Lc, + ∞) and then selecting the corresponding evaluation model to calculate:
in the formula, TmaxThe predicted value of the highest temperature of a natural gas accumulation area in the whole tunnel and a non-natural gas position in the tunnel is obtained; l ismThe length of the natural gas gathering area, namely the distance from the closed end (ignition source position) of the tunnel to the tail end of the natural gas gathering area; l iscThe flame wave and the length of the zone in the tunnel, i.e. the burning rate, continue to progress until they decay to zero, at which point the axial position is at a distance from the ignition source. At the same time, LcAnd LmThe following quantitative relationship exists: l isc＝0.7247Lm 1.2652
The invention has the following beneficial effects:
the method can accurately acquire the highest temperature value of any position on the propagation path of the natural gas in the tunnel after explosion, and realize quick and accurate judgment of the high-temperature disaster.
Drawings
FIG. 1 is a schematic diagram of peak temperature and zoning in an embodiment of the present invention;
in the figure: (a) the length of the natural gas accumulation area is 100 m; (b) the natural gas accumulation zone was 200m in length.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
A tunnel physical model is established by adopting a numerical method, the tunnel is a single-end straight tunnel, and the area of the inner section of the tunnel is 6m2The total length of the tunnel is 1000m, the concentration of natural gas is 10.1%, and the ignition source is arranged at the closed end of the tunnel. The length of the natural gas gathering zone has a large influence on the temperature field. Therefore, tunnels with natural gas gathering zone lengths of 50m, 100m, and 200m were selected as analysis targets.
The combination of the analysis of the burning rate shows that the chemical reaction develops from the closed end of the tunnel to the tail end of the natural gas gathering area (the distance from the ignition source is L) with larger burning ratem) Then continues to develop at a lesser burn rate until the burn rate decays to zero, at which point the axial location is at a distance L from the ignition sourcec. FIG. 1 shows the peak temperature as a function of axial distance for natural gas gathering zone lengths of 100m and 200 m. At (0, L)m) In this region, the peak temperature exhibits an approximately horizontal linear development with increasing axial distance, which is determined by a steady-state propagating flame. In (L)m，Lc) In this region, the peak temperature decreases with increasing axial distance from the roadway, but the downward trend is less, and fluctuations are accompanied therein, since there is still a weaker flame in this region. In (L)cAnd +/-infinity), the chemical reaction is finished, the high-temperature flame is not supported, and the reduction trend of the peak temperature is obviously increased.
In the natural gas gathering area, the peak temperature change is small, and the peak temperatures corresponding to different gathering area lengths are relatively close. In combination with the calculations, when estimating the peak temperature in the natural gas gathering region, it can be approximated that the peak temperature at each axial location in the region is approximately equal to 2000K (the average relative error of each peak temperature compared to 2000K is only 2.066%).
By combining the above analysis and partitioning the tunnel in fig. 1, the highest temperature prediction formula of the natural gas gathering area in the whole tunnel and the area outside the non-natural gas gathering area in the tunnel can be obtained, that is:
through the grasped accident site related data, including the length of the natural gas gathering area in the tunnel, the specific position of the natural gas gathering area in the tunnel is evaluated, and the evaluation position is judged to be (0, L)m)、(Lm，Lc)、(Lc, + ∞) while binding LcAnd LmAnd selecting the corresponding evaluation model for calculation according to the quantitative relation. By utilizing the high-temperature disaster assessment model, when natural gas leakage occurs in the closed tunnel at one end, high-temperature damage areas possibly caused after explosion occurs in the ignition source can be rapidly assessed and predicted.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (1)
1. A method for evaluating natural gas explosion high-temperature disasters in a tunnel is characterized in that a quantitative relation model of the maximum temperature value of any point on a natural gas explosion propagation path in the tunnel, the length of a natural gas gathering area in the tunnel and the distance between the point and an ignition source is established, so that the maximum temperature value of any position on the propagation path of the natural gas explosion in the tunnel is accurately obtained, and the high-temperature disasters are quickly and accurately judged; the method specifically comprises the following steps:
through the grasped accident site related data, including the length of the natural gas gathering area in the tunnel, the specific position of the natural gas gathering area in the tunnel is evaluated, and the evaluation position is judged to be (0, L)m)、(Lm，Lc)、(LcAnd + ∞), and then selecting a corresponding evaluation model to calculate:
in the formula, TmaxThe predicted value of the highest temperature of a natural gas accumulation area in the whole tunnel and a non-natural gas position in the tunnel is obtained; l ismThe length of the natural gas gathering area is the distance from the position of the ignition source at the closed end of the tunnel to the tail end of the natural gas gathering area; l iscThe length of flame waves and regions in the tunnel, namely the combustion rate, continuously develops until the flame waves and the regions are attenuated to zero, and the distance between the axial position and an ignition source is calculated; at the same time, LcAnd LmThe following quantitative relationship exists:
Lc＝0.7247Lm 1.2652。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711065904.2A CN107832520B (en) | 2017-11-02 | 2017-11-02 | Evaluation method for natural gas explosion high-temperature disasters in tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711065904.2A CN107832520B (en) | 2017-11-02 | 2017-11-02 | Evaluation method for natural gas explosion high-temperature disasters in tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107832520A CN107832520A (en) | 2018-03-23 |
| CN107832520B true CN107832520B (en) | 2021-03-19 |
Family
ID=61650481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711065904.2A Active CN107832520B (en) | 2017-11-02 | 2017-11-02 | Evaluation method for natural gas explosion high-temperature disasters in tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107832520B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918355B (en) * | 2018-05-04 | 2020-10-27 | 北京石油化工学院 | Method for evaluating explosion sensitivity parameters of low-density polyethylene powder |
| CN111027176B (en) * | 2019-11-07 | 2023-04-25 | 武汉科技大学 | Calculation method for smoke countercurrent length of tunnel lateral key smoke discharging fire |
| CN112380685B (en) * | 2020-11-10 | 2023-07-21 | 北京石油化工学院 | Visual display and evaluation system platform for explosion disasters |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493804A (en) * | 2011-11-28 | 2012-06-13 | 柳林 | Oil well safety wireless data collecting monitoring system |
| CN105893758A (en) * | 2016-04-01 | 2016-08-24 | 河北工程大学 | WMNT gas explosion disaster risk evaluation method |
| CN106054826A (en) * | 2016-09-09 | 2016-10-26 | 安徽硕尼信息科技有限公司 | Intelligent community natural gas safety monitoring system |
| CN106287223A (en) * | 2016-07-19 | 2017-01-04 | 昆山雅宝信息科技有限公司 | LNG gas station metering device based on optical fiber F P cavity pressure sensor |
| EP3133142A1 (en) * | 2015-08-18 | 2017-02-22 | Linde Aktiengesellschaft | A method of injecting a liquid into a gas stream |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9600998B2 (en) * | 2014-07-16 | 2017-03-21 | Joel Lee MUMEY | System, apparatus, and method for sensing gas |
-
2017
- 2017-11-02 CN CN201711065904.2A patent/CN107832520B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493804A (en) * | 2011-11-28 | 2012-06-13 | 柳林 | Oil well safety wireless data collecting monitoring system |
| EP3133142A1 (en) * | 2015-08-18 | 2017-02-22 | Linde Aktiengesellschaft | A method of injecting a liquid into a gas stream |
| CN105893758A (en) * | 2016-04-01 | 2016-08-24 | 河北工程大学 | WMNT gas explosion disaster risk evaluation method |
| CN106287223A (en) * | 2016-07-19 | 2017-01-04 | 昆山雅宝信息科技有限公司 | LNG gas station metering device based on optical fiber F P cavity pressure sensor |
| CN106054826A (en) * | 2016-09-09 | 2016-10-26 | 安徽硕尼信息科技有限公司 | Intelligent community natural gas safety monitoring system |
Non-Patent Citations (1)
| Title |
|---|
| 施工隧道瓦斯涌出风险评估研究;葛江;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20141015;论文第29-32页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107832520A (en) | 2018-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Numerical simulation on methane-hydrogen explosion in gas compartment in utility tunnel | |
| CN107832520B (en) | Evaluation method for natural gas explosion high-temperature disasters in tunnel | |
| Bariha et al. | Hazard analysis of failure of natural gas and petroleum gas pipelines | |
| Zhu et al. | Analysis and assessment of the Qingdao crude oil vapor explosion accident: Lessons learnt | |
| Na’Inna et al. | Explosion flame acceleration over obstacles: Effects of separation distance for a range of scales | |
| Zhang et al. | Explosions of gasoline–air mixture in the tunnels containing branch configuration | |
| CN106813106B (en) | A method of assessment natural gas line explosion hazard | |
| Oran et al. | Large-scale experiments and absolute detonability of methane/air mixtures | |
| Du et al. | Consequence analysis of premixed flammable gas explosion occurring in pipe using a coupled fluid-structure-fracture approach | |
| Johnson et al. | Detonations and vapor cloud explosions: Why it matters | |
| Zhu et al. | Effect of roadway turnings on gas explosion propagation characteristics in coal mines | |
| Cheng et al. | Full-scale experimental investigation on the shock-wave characteristics of high-pressure natural gas pipeline physical explosions | |
| Gendler et al. | Justification on the safe exploitation of closed coal warehouse by gas factor | |
| Shi et al. | A quantitative correlation of evaluating the flame speed for the BST method in vapor cloud explosions | |
| Fang et al. | Field tests on the attenuation characteristics of the blast air waves in a long road tunnel: a case study | |
| Johnson | Vapour cloud explosion at the IOC terminal in Jaipur. | |
| Kingklang et al. | Failure investigation of liquefied petroleum gas cylinder using FAD and XFEM | |
| Tufano et al. | Simulation of VCEs by CFD modelling: an analysis of sensitivity | |
| Lobato et al. | Consequence analysis of an explosion by simple models: Texas refinery gasoline explosion case | |
| Altuwair et al. | Safety analysis of instantaneous release of compressed natural gas from a cylinder | |
| Li et al. | Quantitative evaluation of explosion consequences in urban underground drainage | |
| Qian et al. | Study on explosion characteristics and self-suppression mechanism of R404A refrigerant in closed container under oxygen-enriched condition | |
| Cheng et al. | Performance of road tunnel subjected to BLEVE occurring inside adjacent tunnel | |
| Johnson et al. | Interpretation of damage caused by a vapor cloud explosion | |
| Cetinyokus et al. | Consequences analysis of a natural gas pipeline: The case of the trans‐Anatolian natural gas pipeline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |