摘要
以国内某海洋平台燃气系统的低温泄放管线为研究对象,采用重整化群(RNG)k-ε模型,对截取的应急泄压阀到限流孔板后1m之间的管线进行了数值模拟分析,得出了不同时刻燃气的流动与传热分布图及分布曲线。结果表明,限流孔板前、后管线在不同时刻均会产生低温,通过数值模拟得到了该管段介质速度和温度变化的定量数据。根据分析,通过限流孔板进行泄压的应急泄压系统应在泄压管段进行保温并伴热,以保证不因温度变化对下游设备产生影响,防止泄放过程中人员误操作导致的冻伤。此外,限流孔板前管线(到上游阀门)长度应保证不小于500mm。
Low temperature depressurizing of fuel gas between blowdown valve and restriction orifice in some subsystem of fuel gas system on some offshore platform was simulated and Renormalization-group k-ε model was adopted. Distributions of flow and heat transfer at different time were obtained by numerical simulation. Results show that low temperature will occur at different time before and after restriction orifice. Measurable results of velocity and temperature late were also obtained by numerical simulation. Design recommendation： insulation and heat tracing will be required in the pipe section to avoid affecting downstream equipment, and also to avoid frozen injury of personnel staff. Pipe length before restriction orifice should more than 500 mm.
出处
《石油化工设备》
CAS
2016年第2期17-21,共5页
Petro-Chemical Equipment
关键词
燃气系统
低温泄放
限流孔板
重整化群(RNG)k-ε模型
数值模拟
fuel gas system
low temperature depressurizing
restriction orifice
renormalization-group k-ε turbulent model
numerical simulation
