管壳式换热器安全阀的设计分析

DESIGN ANALYSIS OF PRESSURE RELIEF VALVE FOR SHELL-AND-TUBE HEAT EXCHANGER

通过结合行业规范和国外工程公司的做法,对管壳式换热器各种泄放工况进行逐一分析,分别研究了出口阀关闭、热胀、火灾和换热管破裂4种工况下的安全阀泄放,提出了管壳式换热器在出口阀关闭、火灾和换热管破裂的工况不设置安全阀的设计方法和行政管理手段。同时每种工况下设置安全阀时,通过计算公式说明了泄放量计算所需要的热通量、受热面积以及潜热等参数,并对比分析了其它国际工程公司的一些管壳式安全阀的设置原则,并列举了工程应用实例。

Combined with industrial standards and the practice of foreign engineering companies,this paper analyzes the relief of shell-and-tube exchanger under four operating conditions including outlet valve closure,thermal expansion,fire and tube rupture.The design methods and administrative means for eliminating the pressure relief valve under these four operating conditions are provided.Parameters including heat flux,heating areaand latent heat required by discharge calculation are introduced viacalculation formulafor designing pressure relief valve for each operating condition,the principle of global engineering companies for designing pressure relief valve for shell-and-tube heat exchanger are compared and analyzed,andsome practical engineering and application examples are given.The judgment method of heat exchanger pressure relief valve setting is provided for each scenario,the detailed calculation method of the relief rate for the pressure relief valve is mentioned and examples of practical engineering applications are cited in this paper.