| Cyclone separator is a sort of equipment that solid particles operated by means of centrifugal force are separated from gas current when they revolved together. For structure being simple, fixture being compact, without relatively moving component, price being low, operating and maintaining conveniently, and satisfying different demand, it has been applied in numerous industries as a equipment separating particles and catching dust in common use, for example in chemical engineering, energy source, mine, oil refining, grocery, material and environment. These years later, the study on cyclone separator gets the regard of engineering field again, along with the technology's applying and development, including the environment consciousness enhancing, energy of the catalyzed smog of refinery reclaiming, coal cleaning and burning, vortex fluidized bed, steam and burned gas combining cycling.As a sort of equipment in common use, the history of cyclone separator is about a hundred years, but its study in theory gets behind of its practice all along. Its study in theory falls across many unsettled problems in modern hydrodynamics, because its work-process is a most complex three-dimension movement of revolve turbulent and two-phase separated, also related to many physics phenomena including reciprocity between gas and solid, coherence, crash, adsorption and static. The laboratorial investigation is also very difficult. The cyclone separator's difference of configurations or geometry dimensions, and especially the difference of physics properties between gas and solid or operation conditions, all affect its most performances distinctly. So far, we have still not known its complex law of flow field and separated mechanism, not held its internal law of the gas current, and still not theorized for a current full mature mathematics model, so that the design and operation of cyclone separator are much more experiential.The study on performance of cyclone separator only by experiment is not only long term, but also expensive. Now, we have already started to turn the study emphases of cyclone separator from the whole characteristic to flow detail, and settle the problem via the simulation by computer. The numerical simulation of flow field is the developmental outcome of modern numerical computer, numerical analysis and computed hydrodynamics up to the minute. The simulation is based on the theory of computed hydrodynamics. We set up a set of basic conserved equations in diversified complex conditions, make the suited model close it in, then solve direct these non-linearity simultaneous partial-differential equations, and accordingly get the spatio-temporal distributing of every variables in the whole flow field. The numericalcomputed technology has many merits, for example, the devoted finance is less, the speed of design and computation is quick, the information is full (it can reveal the interior mechanism thoroughly, and have no blind spot that can not be checked by experimentation), and the ability of emulation and simulation is better. Therefore, studying on the law of fluid in cyclone separator by numerical simulation of the turbulent flow field, and then optimizing its configuration, may shorten the period of study and design of it greatly, and so have a important application worth in engineering.This thesis does the research for the numerical simulation of cyclone separator, using FLUENT6.1.22, the business software of CFD. On the base of deeply understanding of cyclone separator, does the research for the flow of gas, moving tracks of particles, pressure drop and separated efficiency in many different conditions. Approximately two hundred models for the research had been made, from the preparation that defined the most appropriate model and method for the numerical research of cyclone separator, to the finish of all the work. We have got the following conclusions from the results of numerical research in this thesis:(1) Through studying, the method of numerical computation for simulating cyclone separator h... |
PDF Full Text Request