Nonequilibrium modeling of multicomponent condensation in a vertical heat exchanger of a polyethylene reactor.

摘要

or gas phase fluidized bed polyethylene reactors, heat removal is one of the controlling factors that limits the production rate. The most common means of heat removal is by cooling the recycle gas stream in an external heat exchanger, where a portion of the vapour is condensed so that heat removal rates can be increased by use of the latent heat of vaporization. Employing nonequilibrium methods, a steady state model has been developed to describe a multicomponent condensation process in industrial gas phase polyethylene reactor systems. It was found that starting the calculation from the top of the heat exchanger, the model can predict the outlet temperature of the vapour phase,