Indication of lower flammability limit area of LNG jet release based on visible vapor cloud

ZHANG Qianxi; LIANG Dong

doi:10.11949/j.issn.0438-1157.20150691

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Indication of lower flammability limit area of LNG jet release based on visible vapor cloud

更新时间：2025-12-10

- Indication of lower flammability limit area of LNG jet release based on visible vapor cloud
- CIESC Journal Issue S2, Pages: 425-429(2015)
- 作者机构：
  
  1. 广东海洋大学工程学院,广东,湛江,524088
  2. 中山大学工学院,广东,广州,510006
  3. 广东省消防科学技术重点实验室,广东,广州,510006
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150691
  CLC： Q028.8
- Online First：31 August 2015，
  
  Published：31 August 2015
- 稿件说明：
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ZHANG Qianxi, LIANG Dong. Indication of lower flammability limit area of LNG jet release based on visible vapor cloud[J]. CIESC Journal, 2015, (S2): 425-429.
DOI：

ZHANG Qianxi, LIANG Dong. Indication of lower flammability limit area of LNG jet release based on visible vapor cloud[J]. CIESC Journal, 2015, (S2): 425-429. DOI： 10.11949/j.issn.0438-1157.20150691.

摘要

喷射泄漏在LNG泄漏事故中比较常见

由于其蒸汽本身无色无味

难从感观上判断其泄漏扩散范围。但由于其温度低

喷射泄漏会使周边环境空气中水蒸气液化成可见蒸汽云。通过建立LNG喷射泄漏计算流体力学模型

对不同环境条件和喷射速度下的扩散情形进行数值模拟

得到了LNG泄漏扩散区域的温度场和浓度场。根据环境条件和温度场分布

得到了可见蒸汽云区域范围

并总结出可见蒸汽云区域范围与爆炸下限区域范围的关系。喷射泄漏发生时

可以为预测爆炸下限区域范围

划定安全隔离范围和消防救援提供帮助。

Abstract

Liquefied natural gas(LNG)jet release is common in LNG leakage accidents.It is very difficult to judge the leakage diffusion area through the senses for natural gas is colorless and odorless.While jet release can make the water vapor in the surrounding air into a visible cloud of steam due to its low temperature.Through the establishment of LNG jet release computational fluid dynamics(CFD)model

numerical simulations under different environmental conditions and jet velocity have been carried out

and the temperature field and species concentration field at different conditions are obtained.According to the environmental conditions and the temperature field distribution

the visible vapor cloud area can be ranged.The relationship between the distances at the lower flammability limit(LFL)concentration occurs and that corresponding to the visible contour of LNG vapor clouds has been summed up.During an emergency

the work can be a helpful to indicate the danger of cloud ignition and exclusion distances forecast.

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