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大型LNG船发电机室的燃气管线泄漏分析

岑卓伦 刘涛 王磊 窦旭

岑卓伦, 刘涛, 王磊, 窦旭. 大型LNG船发电机室的燃气管线泄漏分析[J]. 中国舰船研究, 2017, 12(5): 109-119. doi: 10.3969/j.issn.1673-3185.2017.05.014
引用本文: 岑卓伦, 刘涛, 王磊, 窦旭. 大型LNG船发电机室的燃气管线泄漏分析[J]. 中国舰船研究, 2017, 12(5): 109-119. doi: 10.3969/j.issn.1673-3185.2017.05.014
Zhuolun CEN, Tao LIU, Lei WANG, Xu DOU. Leakage analysis of fuel gas pipe in large LNG carrier engine room[J]. Chinese Journal of Ship Research, 2017, 12(5): 109-119. doi: 10.3969/j.issn.1673-3185.2017.05.014
Citation: Zhuolun CEN, Tao LIU, Lei WANG, Xu DOU. Leakage analysis of fuel gas pipe in large LNG carrier engine room[J]. Chinese Journal of Ship Research, 2017, 12(5): 109-119. doi: 10.3969/j.issn.1673-3185.2017.05.014

大型LNG船发电机室的燃气管线泄漏分析

doi: 10.3969/j.issn.1673-3185.2017.05.014
详细信息
    作者简介:

    刘涛, 男, 1983年生, 博士, 高级工程师

    通信作者:

    岑卓伦(通信作者), 男, 1988年生, 硕士, 工程师

  • 中图分类号: U664.14

Leakage analysis of fuel gas pipe in large LNG carrier engine room

  • 摘要:   目的  目前,由双燃料发动机组成的电力推进系统是大型液化天然气(LNG)船的主流推进方式,必须对爆炸性可燃气体进行安全可靠性的定性、定量评估,以规避潜在风险。  方法  以某双燃料电力推进大型LNG船发电机室为研究对象,对其内部不同区域的燃气(天然气)泄漏工况进行模拟分析。根据泄漏发生的形式、位置和速率等定义危险泄漏工况,选择雷诺应力模型为湍流模型,采用计算流体力学(CFD)软件Fluent对发电机室燃气供应管线的5个泄漏点进行持续泄漏模拟计算,并将泄漏扩散结果与舱室通风的流场速度分布相结合,得到不同区域发生泄漏后的天然气扩散趋势和浓度分布。  结果  根据仿真模拟结果优化了可燃气体探测器布置方案,并明确了排气风机无需进行防爆设计。  结论  研究结果可为有限空间内通风条件下的可燃气体泄漏事故分析防范提供参考,并且适用于燃烧爆炸破坏的定量评估,用以指导结构强度设计。
  • 图  1  供气系统原理图

    Figure  1.  Fuel-gas supply system diagram

    图  2  发电机室内可燃气体探测器的传统布置

    Figure  2.  Traditional arrangement of flammable gas detectors for engine room

    图  3  发电机室的三维模型

    Figure  3.  Three-dimensional model of engine room

    图  4  燃气供应管线区域划分图

    Figure  4.  Divided partitions of fuel-gas supply pipeline in engine room

    图  5  CFD几何模型

    Figure  5.  Geometry built for CFD analysis

    图  6  网格划分示例

    Figure  6.  An example of meshing

    图  7  泄漏点位置

    Figure  7.  Locations of leak points

    图  8  z=8 m截面在不同时刻的速度矢量分布图

    Figure  8.  Velocity vectors in z=8 m section at different times

    图  9  z=8 m截面内主体流动趋势图(t=91.3 s)

    Figure  9.  Main flow tendency in z=8 m section at t=91.3 s

    图  10  1号泄漏点发生连续泄漏后发电机室不同时刻的天然气摩尔浓度分布图

    Figure  10.  Distributions of natural gas mole concentration in engine room at different times for the continuous leak of Case 1

    图  11  2号泄漏点发生连续泄漏后发电机室不同时刻的天然气摩尔浓度分布图

    Figure  11.  Distributions of natural gas mole concentration in engine room at different times for the continuous leak of Case 2

    图  12  3号泄漏点发生连续泄漏后发电机室不同时刻的天然气摩尔浓度分布图

    Figure  12.  Distributions of natural gas mole concentration in engine room at different times for the continuous leak of Case 3

    图  13  4号泄漏点发生连续泄漏后发电机室不同时刻的天然气摩尔浓度分布图

    Figure  13.  Distributions of natural gas mole concentration in engine room at different times for the continuous leak of Case 4

    图  14  5号泄漏点发生连续泄漏后发电机室不同时刻的天然气摩尔浓度分布图

    Figure  14.  Distributions of natural gas mole concentration in engine room at different times for the continuous leak of Case 5

    图  15  可燃气体探测器布置图

    Figure  15.  Arrangement of flammable gas detectors

    表  1  泄漏工况定义

    Table  1.   Definition of leak cases

    工况泄露点尺寸/ mm出口流速/(m·s-1泄漏形式泄漏点位置
    Case 120×2066.29持续泄漏8L发动机软管连接处
    Case 220×2066.29持续泄漏8L发动机顶部燃气管末端
    Case 320×2066.29持续泄漏12V发动机软管连接处
    Case 420×2066.29持续泄漏12V发动机顶部燃气管末端
    Case 520×2066.29持续泄漏12V发动机顶部燃气管中间段
    下载: 导出CSV
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  • 收稿日期:  2017-03-14
  • 网络出版日期:  2017-09-26
  • 刊出日期:  2017-10-01

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