Numerical simulation of gas dispersion during cold venting of natural gas pipelines
This article analyzes the effects of various factors on gas dispersion during cold venting based on the actual cold venting operations of long-distance natural gas pipelines in China. Under the circumstance that no obstacles existed, unified dispersion model and PHAST software were used to simulate...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2018-02-01
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| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1177/1687814018755244 |
| _version_ | 1828781269292417024 |
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| author | Ning Liao Kun Huang Liqiong Chen Zhifang Wang Jin Wu Fang Zhang |
| author_facet | Ning Liao Kun Huang Liqiong Chen Zhifang Wang Jin Wu Fang Zhang |
| author_sort | Ning Liao |
| collection | DOAJ |
| description | This article analyzes the effects of various factors on gas dispersion during cold venting based on the actual cold venting operations of long-distance natural gas pipelines in China. Under the circumstance that no obstacles existed, unified dispersion model and PHAST software were used to simulate the gas dispersion process of cold venting in order to study the changes of gas concentration along vertical and horizontal directions over time. FLUENT was used to make numerical simulations to analyze the effect of the existence of high obstacles on gas dispersion. The results indicated that (1) with an increase in wind speed, the concentration range in which the gas might explode (5%–15%) decreased along the vertical direction but slightly increased along the horizontal direction; (2) when the initial venting pressure gradually decreased with the proceeding of cold venting, the downwind distance that might trigger danger reduced significantly; and (3) with an increase in atmospheric stability, the dispersion height of vented gas first increased and then decreased continuously. High atmospheric stability could inhibit the gas dispersion height to a larger degree than the wind speed and aerostatic buoyancy could facilitate it. |
| first_indexed | 2024-12-11T17:30:51Z |
| format | Article |
| id | doaj.art-c1560d0cc8e94c72bb7146a1f130c3a8 |
| institution | Directory Open Access Journal |
| issn | 1687-8140 |
| language | English |
| last_indexed | 2024-12-11T17:30:51Z |
| publishDate | 2018-02-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-c1560d0cc8e94c72bb7146a1f130c3a82022-12-22T00:56:50ZengSAGE PublishingAdvances in Mechanical Engineering1687-81402018-02-011010.1177/1687814018755244Numerical simulation of gas dispersion during cold venting of natural gas pipelinesNing Liao0Kun Huang1Liqiong Chen2Zhifang Wang3Jin Wu4Fang Zhang5School of Petroleum Engineering, Southwest Petroleum University, Chengdu, ChinaSchool of Petroleum Engineering, Southwest Petroleum University, Chengdu, ChinaSchool of Petroleum Engineering, Southwest Petroleum University, Chengdu, ChinaPetroChina West-East Gas Pipeline Company, Shanghai, ChinaElectromechanical Construction Co., Ltd., China Gezhouba Group, Chengdu, ChinaPetroChina West-East Gas Pipeline Company, Shanghai, ChinaThis article analyzes the effects of various factors on gas dispersion during cold venting based on the actual cold venting operations of long-distance natural gas pipelines in China. Under the circumstance that no obstacles existed, unified dispersion model and PHAST software were used to simulate the gas dispersion process of cold venting in order to study the changes of gas concentration along vertical and horizontal directions over time. FLUENT was used to make numerical simulations to analyze the effect of the existence of high obstacles on gas dispersion. The results indicated that (1) with an increase in wind speed, the concentration range in which the gas might explode (5%–15%) decreased along the vertical direction but slightly increased along the horizontal direction; (2) when the initial venting pressure gradually decreased with the proceeding of cold venting, the downwind distance that might trigger danger reduced significantly; and (3) with an increase in atmospheric stability, the dispersion height of vented gas first increased and then decreased continuously. High atmospheric stability could inhibit the gas dispersion height to a larger degree than the wind speed and aerostatic buoyancy could facilitate it.https://doi.org/10.1177/1687814018755244 |
| spellingShingle | Ning Liao Kun Huang Liqiong Chen Zhifang Wang Jin Wu Fang Zhang Numerical simulation of gas dispersion during cold venting of natural gas pipelines Advances in Mechanical Engineering |
| title | Numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| title_full | Numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| title_fullStr | Numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| title_full_unstemmed | Numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| title_short | Numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| title_sort | numerical simulation of gas dispersion during cold venting of natural gas pipelines |
| url | https://doi.org/10.1177/1687814018755244 |
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