基于CFD的浸没燃烧式气化器燃烧器结构优化

Optimization of Burner Structure for Submerged Combustion Vaporizer Based on CFD

浸没燃烧式气化器(SCV)是LNG接收站常用气化器类型之一,具有热效率高、负荷调节响应迅速、不受外界环境温度影响等优点,是LNG接收站冬季天然气调峰保障的关键设备之一。为解决国内某LNG接收站SCV燃烧器在运行过程中底板过热现象,采用计算流体动力学(CFD)方法作为辅助手段对燃烧器进行结构变更的理论验证,基于燃烧器的几何结构,进行不同负荷条件下的数值模拟,再通过Fluent流场分析软件进行计算,重点分析了将燃烧器预混气管延长100 mm后,燃烧器底板温度分布、气流流动路径、速度矢量分布等。计算结果表明:通过CFD方法的分析验证,将燃烧器预混气管延长100 mm能够将高温温度分布向下移动,有效改善底板处温度过热问题,达到设备安全平稳运行的目的,为该类型燃烧器的故障维修提供了良好的经验借鉴。

Submerged combustion vaporizer(SCV)is one of the commonly used vaporizers in LNG terminals.It has the advantages of high thermal efficiency,rapid response to load regulation,and is not affected by ambient temperature,etc.It is one of the key equipment for natural gas peak regulation in winter in LNG terminals.In order to solve the overheating phenomenon of the bottom plate of the SCV burner in the operation process of a domestic LNG terminals,the computational fluid dynamics(CFD)method was used as an auxiliary means to verify the theoretical optimization of the burner structure.The simulation model was established according to the geometric structure of the burner,and the numerical simulation under different load conditions was carried out.And the calculation is carried out by fluent flow field analysis software.The temperature distribution,flow path and velocity vector distribution of the burner bottom plate were analyzed after the premixed gas pipe was extended by 100 mm.The calculation results show that:through CFD analysis and verification,extending the premix pipe of the burner by 100 mm can move the high temperature distribution downward,effectively improve the temperature overheating problem at the bottom plate,achieve the purpose of safe and stable operation of the equipment,and provide a good experience for the fault maintenance of this type of burner.