Numerical Simulation Of Flow Problems Of The Headers And Parallel Tube Platen System Of A Utility Boiler

The reliability of the boiler operation is related to the security and economy of the entire power plant. One of the common accidents in the boiler operation is that the parallel tube of the pre-heater or re-heater will be broken easily because of over-temperature. An important reason of over-temperature is the flow mass deviation between parallel tubes causing by the swirl or the unreasonable structure of the header. Therefore, predicting the flow mass deviation correctly is a very important issue.In this paper, starting from the general partial differential equations of flow problems, a 3-D partitioning parallel CFD procedure is developed under MPI environment, based on SIMPLE-C, domain decomposition method and Dirichlet-Neumann algorithm. And then, for a simplified model of a typical system of headers and parallel tube platen in a utility boiler, the partitioning structured grids of dividing header, collection header and parallel tubes are generated. Then, the partitioning parallel numerical simulation of this flow problem is realized and the results of the velocities, pressure and flow mass of each of tubes are obtained. The flow characteristics are analyzed and discussed to determine the position which will be broken easily basing on these results. Last, the efficiency of partitioning parallel calculation over a PC network is discussed and some strategies of partitioning parallel calculation are summarized. Meanwhile, an effective method is provided to solve other lager scale and complex flow problems.