Aspen dynamics compressor simulation

Thread Content

I have been working on simulations related to distillation separation recently. In Aspen software, in order to switch from steady-state results to dynamic ones, it is necessary to add elements for pressure conversion (such as pumps, valves, compressors, etc.). Compressors are added to the gas-phase pipelines to ensure pressure balance between the different tower modules. There are a few issues I’m not quite sure about: 1. Adding compressors and other such elements to achieve the pressure balance required for dynamic simulations changes the results obtained from the steady-state simulations. 2. The pressure changes are already very small; adding compressors not only alters the properties of the flow streams but may also affect the control effectiveness in dynamic simulations if the pressure changes are minimal 2. How to select compressors and similar equipment? I saw relevant posts discussing multi-dimensional compression using the GPSA method – what are the differences compared to isentropic compression and other types? Which type is closest to the reciprocating type? 3. In the dynamics file, the compressor is used to maintain pressure stability; there are four operating variables available for selection: speed, braking power, polytropic efficiency, and mechanical efficiency. Which one is the most suitable? How is a compressor controlled in engineering? Please ask an expert to explain it, thank you