安全阀动态泄放下火炬模拟研究

Study on Flare Simulation at Safety Valve Dynamic Relief Scenario

海上平台火炬系统计算需要根据不同泄放源的泄放工况进行综合分析,以选取合适的泄放量。由于实际泄放阀选阀尺寸一般高于必需尺寸,导致实际泄放量远大于必需泄放量,而基于安全阀额定泄放量进行火炬系统设计,将增加设备尺度及火炬臂长度。创新性采用HYSYS动态模拟结合Flaresim动态计算方法,得到在安全保护系统作用下火炬泄放量及热辐射的变化趋势,结果证明基于必需泄放量下的火炬长度可以满足火炬安全泄放要求,该技术方法和结论在一定程度上可以用于指导工程实践。

In order to select suitable relieving amount,different scenarios of discharge sources shall be analyzed for flare system calculation at offshore platform.Usually the actual size of safety valve is larger than the required size,which leads to an actual relieving amount far more higher than the required one.However calculation based on rated relieving amount will increase the flare facilities load and enlarge equipment and flare stack sizes.In order to solve this issue,HYSYS dynamic simulation combined with Flaresim dynamic calculation is adopted in this paper to obtain the trend of flare reliving volume and thermal radiation against time.The analysis result proves that flare length based on the required relieving capacity could satisfy flare relief safely.This paper can be used to guide engineering practice in certain extent.