天然气工业2018，Vol.38Issue(5)：133-139,7.DOI:10.3787/j.issn.1000-0976.2018.05.016
火灾环境下CNG长管拖车气瓶不同结构泄压装置的响应规律
Response laws of pressure relief devices with different structures on the cylinder of CNG long tube trailer in fire environments
摘要
Abstract
Natural gas is susceptible to leakage and explosion during storage and transmission. Any of such incidents may induce great personal and physical losses. Therefore, installation of pressure relief devices is mandatory under relevant industry standards and codes to ensure the safe pressure release of CNG cylinders under over-temperature and over-pressure conditions, so as to reduce the accident risks. However, the calculation methods and formulas for the design of pressurerelief devices under such standards and codes are different, so the pressure relief devices provide different responses under fire conditions. In this paper, the case that a large-capacity seamless steel cylinder is totally in fire was analyzed to figure out the temperature and pressure changes of the CNG cylinder on the trailer and the responses of pressure relief devices with different structural styles. The following results were obtained. First, the pressure relief devices designed according to API 521-2014, CGA S-1.1 and GB 16918-1997 can satisfy the requirements on safe pressure release of large-capacity seamless steel cylinder. Considering that CNG may induce secondary damage, it is recommended to calculate the minimum relief area according to API 521-2014 or CGA S-1.1. Second, when the flame is isolated by the steel plates, the heat conduction of pressure relief devices is hindered and a single bursting disc structure usually responds earlier than a composite structure of bursting disc and fusible alloy. Third, when a large-capacity seamless steel cylinder is in fire, the change of gas temperature is much more affected by the relief area after the pressure relief device is started. In conclusion, the research results provide a technical support for the standard preparation and type selection of pressure relief devices on the CNG tube trailers.关键词
CNG/长管拖车/大容积无缝钢瓶/泄压装置/国内外标准/设计计算/泄放面积/响应规律/火烧试验Key words
CNG/Tube trailer/Large-capacity seamless steel cylinder/Pressure relief device/Domestic and foreign standards/Design and calculation/Relief area/Responses/Fire test引用本文复制引用
赵保頔,薄柯,骆辉,邓贵德,刘岑凡,金明哲,荆博..火灾环境下CNG长管拖车气瓶不同结构泄压装置的响应规律[J].天然气工业,2018,38(5):133-139,7.基金项目
国家质量监督检验检疫总局科技计划项目"CNG长管拖车气瓶安全泄放量计算方法及典型泄压装置安全性能研究" (编号:2016QK208). （编号:2016QK208）
