Ejector for Vacuum Distillation Ejector System

Abstract

The following report deals with the designing and analysis of steam/gas ejector. Inlet pressure, mass flow rate and temperature of both primary fluid and secondary fluid, back pressure of diffuser, temperature of mixed fluid at diffuser end and entrainment ratio were initial parameters used to design the ejector. Isentropic relations were used for designing the primary nozzle which were obtained from various sources. Deciding factor in its designing was the back pressure which was linked with nozzle position. Designing of secondary nozzle was done partially by ESDU approach and partially with isentropic relations of shockwave. First Shut off condition was also calculated for different nozzle positons. Results obtained analytical were corroborated by CFD analysis of both primary and secondary nozzle. Angles of convergence and divergence of both primary and secondary nozzle and length of mixing chamber were selected after thorough CFD analysis. The prototype was manufactured after detail review of the prototyping methods i.e. casting, machining. Experiments were performed on the prototype while testing it in real time after connecting it to an outlet of a boiler. The results were then compared and conclusions were drawn.