爆炸0区防爆风机内部流场模拟及试验研究

Simulation and experimental study of flow field of explosion-proof fan in explosion zone 0

风机是化工过程中重要的流体传动设备,根据安全要求,在爆炸0区的风机出入口需配备阻火器。针对阻火器及叶轮流场问题,利用有限元仿真软件进行建模分析,仿真结果表明,经过阻火器后湍流动能最大值达到17.87 m2/s2,阻火器出口湍流强度增强;同时研究分析了直叶轮和圆弧叶轮风机内部流场,结果表明圆弧叶轮速度、压力及湍流动能分布更加均匀,升压性能更强,适合作为防爆风机叶轮。针对圆弧轮盘应力是否符合标准问题,通过构建了轮盘应力模型对其进行了分析,结果表明叶轮最大离心力为263.9.1 MPa,满足叶轮强度要求。根据模拟结果,研制了一台0区防爆风机,试验测试结果表明样机在3000 r/min工况下,总压为12113 Pa,满足设计要求;样机性能参数与模拟计算结果吻合度高,为以后其他型式叶轮或者多级0区防爆风机的设计计算提供基础。

Fan is an important fluid transmission equipment in chemical process.According to the safety requirements,the inlet and outlet of the fan in explosion zone 0 should be equipped with flame arrester.The finite element simulation software is used to model and analyze the flame arrester and impeller rotation field.The simulation results show that the maximum turbulent kinetic energy reaches 17.87 m2/s2 after passing through the flame arrester,and the turbulence intensity at the flame arrester outlet is increased.At the same time,the flow field inside the straight impeller and the circular impeller fan is studied and analyzed.The results show that the velocity,pressure and turbulent kinetic energy of the circular impeller are distributed more uniformly,and the boost performance is stronger,which is suitable for use as the explosion-proof fan impeller.For the problem of whether the stress of circular wheel disc conforms to the standard,the stress model of the wheel disc is constructed.The research results show that the maximum centrifugal force of the impeller is 263.9.1 MPa,which meets the strength requirements of the impeller.According to the simulation results,the first 0-zone explosion-proof fan in China has been developed.The test results show that the prototype meets the design requirements at 3000 r/min with a total pressure of 12113 Pa.The performance parameters of the prototype are in good agreement with the simulation results,which provide a basis for the design and calculation of other impeller types or multistage 0-zone explosion-proof fan in the future.