Calculation method for performances of new-type two-stage cyclone separators in acrylonitrile reactors

The new-type two stage cyclone separator for acrylonitrile reactor consists of a conventional PV cyclone separator as the first stage and a model PV-E cyclone separator as the second stage. The features of simple construction, excellent separation performance and good operational stability of the new separator make it very suitable for the capacity expansion of an existing acrylonitrile unit. However, there is no reliable method for determining the performances of the new cyclone at present. The constructions and performances of the model PV cyclone separator with those of the model PV-E cyclone separator were compared, in consideration of the fact that there exists an applicable method for calculating the performance of model PV cyclone separator. A modified calculation approach was then proposed. The cold test and industrial test data showed the accurate and reliable results of this modified approach. This modified approach can be used to present reference for the design of new-type two-stage cyclone separator and the operational control of acrylonitrile reactors.