Study On Hydrocyclone In Ebullated Bed Reactor Of Biomass Pyrolysis Liquid

At present,hydrogenation of biomass pyrolysis liquid to produce biomass gasoline and diesel by the ebullated bed reactor is the best way to replace crude oil.The axial-flow hydrocyclone in the ebullated bed reactor can realize the separation and catalyst activation.Therefore,the research on the hydrocyclone is of great significance to the improvement of the reactor.The self-rotation model and coupling centrifugal force model of particles in swirling flow field are established by theoretical calculation.And the influence of the vortex finder structure on self-rotation and revolution of the particles is studied by means of computational fluid mechanics,particle image velocimetry and high-speed camera technology.Finally,the catalyst activation experiment is carried out,which correlates the self-rotation of particles with the desorption of oil attachments,and proves that optimizing the structure of hydrocyclones and operating conditions can promote the catalyst activity.The results show that the decrease of the inlet flow rate Q,the increase of the vortex finder length hc,the decrease of the vortex finder taper angle ac and the increase of the vortex finder diameter D2 will improve the separation efficiency.The hydrocyclone with a cylindrical vortex finder with hc of 335 mm and D2 of 75 mm is the optimum hydrocyclone.This hydrocyclone has the highest separation efficiency and completely separates alumina particles with size above 240 ?m.The increase of Q and the decrease of hc can increase the revolution speed of the particles.The increase of Q and hc can increase the self-rotation speed of particles.When Q and hc is equal to 0.22 m3/h and 335 mm,the maximum self-rotation speed of the tracer particle with diameter of 500 ?m is equal to14.79 rad/s.Increasing Q and hc can promote the removal efficiency.The guaiacol and n-Hexadecane contents decrease and the removal efficiencies increase with the increase of hc.When Q and hc are equal to 0.22 m3/h and 335 mm,the guaiacol and n-Hexadecane contents are the lowest(11.42%and 16.14%),and the removal efficiencies are the highest(79.24%and 58.04%).The above findings are of great significance to the design and development of the separator in the ebullate bed reactor,and can effectively solve the problems of catalyst deactivation and separation.