Experiment And Numerical Simulation Of Horizontal Cyclone Separator With Accelerating Section Outside

Separator is one of the key components in circulating fluidized bed boiler. It can take a large number of high-temperature solid particles back to combustion chamber to burn out, and ensure the rapid flow conditions in combustion chamber. It is the key of the cycle, and also the core which different boiler manufacturers compete about. The horizontal cyclone separator with accelerating section has some advantages, such as smaller volume, simpler structure and lower cost, as compared with conventional vertical cyclone separator and high separating efficiency. In order to understand its gas-solids flow field, numerical simulation and experiments were carried out to simulate the turbulent gas-solids flow in the separator. This paper introduced its application in siteFirst, a review was carried out on the main types, performance parameters and influencing factor of cyclone. Then the horizontal cyclone separator with accelerating section was brought out. The paper also introduced the researches conducted by some scholars home and abroad who had used Fluent to simulation the cyclone.Next, this paper retrofits the cold test of CFB, and had done some experimentally study, discussed the dependence of pressure drop and gas flux, calculated the drag coefficient of the cyclone, the screening data of bed material have been researched, and the separation efficiencies were obtained that they are above 99.5% when the average diameter of 352μm, 295μm and 150μm, the results showed that the separator have a better separating efficiency for fine particle.Finally, numerical simulation was carried out to simulate the turbulent gas-solids flow in the separator. The model uses the Reynolds Stress Model (RSM) to simulate gas-phase flow and the Discrete Phase Model (DPM) to trace a moving track of solid particles. Velocity field, pressure field and turbulence distribution were obtained. Detail moving tracks of 1μm, 5μm, 10μm and 30μm particles were simulated and reported. It has been analyzed the influence of the flux, the inserting depth and diameters of exhaust pipe to the pressure loss and separation efficiency. This supplies a reference and a warrant for the study and improvement of the separator.