Research On The Mathematical Simulation Of PSA Producing Nitrogen

The application of PSA to produce nitrogen was the main researching object in this thesis. Base on the fundamental principle of PSA procedure, the author ascertained the mass transfer mechanism and the mass transfer model. By analyzing the procedure of PSA, the mathematical model had been found. This model included: mass conversation of the flow gaseous phase, the overall material balance equation causing the variation of the fluid velocity though the column and using the linear driving force model to describe the mass transfer between the fluid and the absorption substance. This model referred to various parameters, so it was hard to obtain the optimization combination of all parameters and explain the mechanism of the PSA by experiment. In order to reduce the cost and investment scale, so in this thesis, the author deployed mathematical model to simulate the PSA procedure, analyze the inner mechanism and optimize the technology parameters.In this text, the mathematical model had been solved by applying the orthogonal collocation. But to allocate the orthogonal matrix requests massive time and energy. The specific collocation had been displayed by using w( x ) = 1? x2 as weight function. During the procedure of allocating the orthogonal matrix, the author simplified the tradition formula. The m-function of Matlab was used to design calculating program. The exporting orthogonal matrix could be used in the continued solution directly. When the collocation points were multitude, this function could reduce the workload and increase the accuracy.The dynamic simulating procedure had shown the affection to the nitrogen purity cause by the length of absorption bed, absorption time and absorption pressure and so on.In this thesis, the simulating procedure being made to GUI mode had been propounded. In the GUI mode, the staff could modify parameters to obtain the best outcome. The parameters gotten from the GUI mode could be used to guide the experiment.