放空立管与天然气站场间距的计算

1. 北京中联奥意设计咨询有限公司;2. 中国石油天然气管道局工程有限公司

天然气站场;放空立管;间距

Calculation of the spacing between venting riser and natural gas station
XUE Xuyan1, TIAN Yifeng2

1. Beijing United Oil Engineering Design Consulting Co. Ltd.; 2. China Petroleum Pipeline Engineering Co. Ltd.

natural gas station, venting riser, spacing

备注

目前中国对放空立管与天然气站场的间距按照GB 50183— 2004《石油天然气工程设计防火规范》来确定,但该规范未对放空量大于4×104 m3/h 的立管与站场的间距做出相应规定。在考虑了放空立管与站场间距的主要影响因素风速与允许辐射热强度的情况下,利用挪威船级社过程危害分析软件工具PHAST 分别计算了冷放空天然气的扩散、点火放空天然气燃烧辐射热影响强度与范围,并给出了50%的爆炸下限(Lower Flammable Limit,LFL)浓度边界空间分布以及允许热辐射强度为4.73 kW/m2 的辐射热影响范围。研究结果确定了放空立管与天然气站场的间距,并为站内设备操作区、人员住宿区、控制室、值班室等建构筑物的平面布置、站场征地提供了理论依据。(图2表2,参[20]

In China, the spacing between venting riser and natural gas station is currently determined in accordance with the Code for Fire Protection Design of Oil and Natural Gas Engineering (GB 50183-2004), but this code has no specification on the spacing between the station and the riser with the venting rate greater than 4×104 m3/h. In this paper, the main factors influencing the spacing between venting riser and station, i.e. the wind speed and the allowable radiation heat intensity, were considered. Then, the influential intensity and range of the burning radiation heat induced by ignition vent and the diffusion of cold vent were calculated respectively using the PHAST software of DNV. And the spatial distribution of concentration boundary at the lower flammable limit of 50% and the influential range of radiation heat at the allowable radiation heat intensity of 4.73 kW/m2 were also calculated. The research results determine the spacing between venting riser and natural gas station and provide the theoretical basis for the layout of buildings and structures (e.g. equipment operation area, accommodation area, control room and duty room) and the land requisition of stations. (2 Figures, 2 Tables, 20 References)