CN107832520A - A kind of gas explosion Evaluation of High Temperature Disaster method in tunnel - Google Patents
A kind of gas explosion Evaluation of High Temperature Disaster method in tunnel Download PDFInfo
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- CN107832520A CN107832520A CN201711065904.2A CN201711065904A CN107832520A CN 107832520 A CN107832520 A CN 107832520A CN 201711065904 A CN201711065904 A CN 201711065904A CN 107832520 A CN107832520 A CN 107832520A
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Abstract
The invention discloses a kind of gas explosion Evaluation of High Temperature Disaster method in tunnel, by the causes for establishing in tunnel on gas explosion propagation path distance between gas accumulation section length and the point and incendiary source in any point temperature maximum and tunnel, so as to accurately obtain in tunnel the maximum temperature value of any position on its propagation path after gas explosion, the quick and precisely judgement of High Temperature Disaster is realized.
Description
Technical field
The present invention relates to gas explosion Disaster Assessment field, and in particular to gas explosion High Temperature Disaster in a kind of tunnel
Appraisal procedure.
Background technology
Natural gas is a kind of high-quality and efficient energy, while it is also a kind of typical explosion dangerous source.Natural gas transportation mistake
Journey also tends to carry out highway transportation by vehicle using after the containers stores such as storage tank, compressed gas cylinder in addition to using long-distance transport pipes.
During highway transportation, once natural gas leaks in container, it is possible to explosive mixed gas is mixed to form with air,
Incendiary source is run into be possible to that gas explosion accident occurs.
Natural gas density is more much smaller than air, even if leakage occurs in relatively open space and is not easy to gather for natural gas
Collection, even and if explode, due to lacking restraining structure, bursting strength is also usual relatively low, therefore natural gas is let out in clearing
It is relatively low to leak the risk of blast, however, natural gas occurs in the relatively limited space such as some tunnels, underground storehouse, kitchen
After leakage, gas leakage is difficult to quickly discharge, and then is mixed with air and flock together to form explosive mixed gas, and
Because restricted clearance structure has enhancement effect to gas explosion, therefore larger risk of explosion will be brought.Natural gas storage tank,
The containers such as gas cylinder will often pass through vcehicular tunnel in transport process.Tunnel is a kind of typical restricted clearance, in recent years
A lot of particularly serious traffic accidents are had occurred and that in highway in China tunnel.Once traffic thing occurs in tunnel for natural gas transportation vehicle
Therefore cause natural gas leaking, it will very likely assemble in tunnel and trigger gas explosion accident, and cause huge casualties
And property loss.
High temperature is one of main factors causing disaster of gas explosion accident.High temperature is likely to be breached number caused by gas explosion
Thousand degrees Celsius, serious burn may be caused even lethal to personnel.However, existing all kinds of documents, data and technological achievement pair
The focal point of gas explosion factors causing disaster is the caused positive pressure of shock wave that explodes, not yet to High Temperature Disaster caused by blast
Attach great importance to.Still lack the quantitative evaluating method of gas explosion High Temperature Disaster in tunnel at present, and then have impact on such
The Accurate Prediction of accident and assessment.Obviously, a kind of accurately and rapidly gas explosion Evaluation of High Temperature Disaster method in tunnel is established
Risk assessment, emergency management and rescue and accident investigation analysis for such accident is significant.
The content of the invention
To solve the above problems, the invention provides a kind of gas explosion Evaluation of High Temperature Disaster method in tunnel, can
When natural gas leaking occurs to one end closing tunnel, high temperature injury region caused by chance incendiary source is possible after exploding carries out fast
Speed is assessed and prediction.
To achieve the above object, the technical scheme taken of the present invention is：
A kind of gas explosion Evaluation of High Temperature Disaster method in tunnel, by establishing gas explosion propagation path in tunnel
In upper any point temperature maximum and tunnel between gas accumulation section length and the point and incendiary source distance quantitative pass
It is model, so as to accurately obtain in tunnel the maximum temperature value of any position on its propagation path after gas explosion, realizes
The quick and precisely judgement of High Temperature Disaster；Specifically comprise the following steps：
By the scene of the accident related data of grasp, including gas accumulation section length, assessment particular location in tunnel, and
Judge that assessing position is in (0, Lm)、(Lm, Lc)、(Lc,+∞) which of region, then choose corresponding to assessment models enter
Row calculates：
In formula, TmaxFor the maximum temperature prediction of non-natural gas position in natural gas accumulation region in whole tunnel, tunnel
Value；LmFor gas accumulation section length, i.e., from tunnel blind end (igniting source position) to the distance of gas accumulation area end；Lc
It is the length of tunnel flame affected area, i.e., combustion rate sustainable development is up to decaying to zero, and axial location now is away from igniting
The distance in source.Meanwhile LcWith LmFollowing quantitative relationship be present：Lc=0.7247Lm 1.2652
The invention has the advantages that：
The present invention can accurately obtain in tunnel the maximum temperature of any position on its propagation path after gas explosion
Value, realizes the quick and precisely judgement of High Temperature Disaster.
Brief description of the drawings
Fig. 1 is peak temperature and subregion schematic diagram in the embodiment of the present invention；
In figure：(a) natural gas accumulation section length is 100m；(b) natural gas accumulation section length is 200m.
Embodiment
In order that objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
Describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
Embodiment
Tunnel physical model is established using numerical method, tunnel is the straight tunnel of only head, and cross-sectional area is 6m in tunnel2, tunnel
Road total length is 1000m, concentration of natural gas 10.1%, and incendiary source is arranged on tunnel blind end.Gas accumulation section length pair
Temperature profile effect is larger.Therefore, the tunnel that gas accumulation section length is 50m, 100m, 200m is selected to be used as analysis object.
Understood with reference to the analysis to combustion rate, chemically react and natural gas is developed into from tunnel blind end with larger combustion rate
Accumulation regions end (is L away from incendiary source distancem), then continue to develop with less combustion rate, until combustion rate decays to zero, this
When axial location away from incendiary source distance be Lc.Fig. 1 gives peak temperature when gas accumulation section length is 100m and 200m
With the change of axial distance.(0, Lm) in region, a level of approximation straight line is presented with the increase of axial distance in peak temperature
State of development, this is determined by the flame stably propagated.In (Lm, Lc) in region, peak temperature is with tunnel axial distance
Increase and reduce, but downward trend is little, and wherein with fluctuation, because still having weaker fire in the region
Flame.In (Lc,+∞) and in region, chemical reaction is over, and without the support of thermal-flame, peak temperature downward trend is bright
Aobvious increase.
In gas accumulation area, peak temperature change is smaller, and peak temperature corresponding to different aggregation section lengths is more
It is close.With reference to result of calculation, when estimating the peak temperature in gas accumulation area, each axial position in the region can be approximately considered
The peak temperature put is approximately equal to 2000K (average relative error of each peak temperature compared to 2000K is only 2.066%).
In summary analyze, with reference in Fig. 1, to tunnel subregion, gas accumulation area, tunnel in whole tunnel can be obtained
Region maximum temperature predictor formula beyond interior non-natural gas accumulation regions, i.e.,：
By the scene of the accident related data of grasp, including gas accumulation section length, assessment particular location in tunnel, and
Judge that assessing position is in (0, Lm)、(Lm, Lc)、(Lc,+∞) which of position, in combination with LcWith LmQuantitative relationship,
Assessment models are calculated corresponding to selection.Using the Evaluation of High Temperature Disaster model, tunnel can be closed to one end and occurred naturally
During gas leakage, high temperature injury region caused by chance incendiary source is possible after exploding carries out rapid evaluation and prediction.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of gas explosion Evaluation of High Temperature Disaster method in tunnel, it is characterised in that by establishing natural gas explosion in tunnel
Any point temperature maximum and gas accumulation section length in tunnel and the spacing of the point and incendiary source on fried propagation path
From causes, so as to accurately obtain in tunnel the highest temperature of any position on its propagation path after gas explosion
Angle value, realize the quick and precisely judgement of High Temperature Disaster.
2. gas explosion Evaluation of High Temperature Disaster method in a kind of tunnel as claimed in claim 1, it is characterised in that specific bag
Include following steps：
By the scene of the accident related data of grasp, including gas accumulation section length, assessment particular location in tunnel, and judge
Assess position and be in (0, Lm)、(Lm, Lc)、(Lc,+∞) which of section, then choose corresponding to assessment models counted
Calculate：
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<mn>2000</mn>
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</mtr>
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<mn>2002.049</mn>
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</msub>
<mi>L</mi>
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<mn>0.271</mn>
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<mn>4455.173</mn>
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</mtr>
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</mfenced>
</mrow>
In formula, TmaxFor the maximum temperature predicted value of non-natural gas position in natural gas accumulation region in whole tunnel, tunnel；LmFor
Gas accumulation section length, i.e., from tunnel blind end (igniting source position) to the distance of gas accumulation area end；LcFor tunnel
The length of flame affected area, i.e. combustion rate sustainable development until decay to zero, axial location now away from incendiary source away from
From.Meanwhile LcWith LmFollowing quantitative relationship be present：Lc=0.7247Lm 1.2652。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711065904.2A CN107832520B (en) | 2017-11-02 | 2017-11-02 | Evaluation method for natural gas explosion high-temperature disasters in tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711065904.2A CN107832520B (en) | 2017-11-02 | 2017-11-02 | Evaluation method for natural gas explosion high-temperature disasters in tunnel |
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| Publication Number | Publication Date |
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| CN107832520A true CN107832520A (en) | 2018-03-23 |
| CN107832520B CN107832520B (en) | 2021-03-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918355A (en) * | 2018-05-04 | 2018-11-30 | 北京石油化工学院 | A kind of appraisal procedure of low density polyethylene (LDPE) smashed district responsive parameter |
| CN111027176A (en) * | 2019-11-07 | 2020-04-17 | 武汉科技大学 | Method for calculating flue gas countercurrent length of tunnel side-direction key smoke discharge fire |
| CN112380685A (en) * | 2020-11-10 | 2021-02-19 | 北京石油化工学院 | Visual display and evaluation system platform for explosion disasters |
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| EP3133142A1 (en) * | 2015-08-18 | 2017-02-22 | Linde Aktiengesellschaft | A method of injecting a liquid into a gas stream |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918355A (en) * | 2018-05-04 | 2018-11-30 | 北京石油化工学院 | A kind of appraisal procedure of low density polyethylene (LDPE) smashed district responsive parameter |
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| CN111027176A (en) * | 2019-11-07 | 2020-04-17 | 武汉科技大学 | Method for calculating flue gas countercurrent length of tunnel side-direction key smoke discharge fire |
| CN112380685A (en) * | 2020-11-10 | 2021-02-19 | 北京石油化工学院 | Visual display and evaluation system platform for explosion disasters |
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