They can be used either as stand-alone devices, or in combination with a contact vessel. absolute to atmosphere the following equations will give approximate results for steam jet ejector stages handling. They have the combined benefits of being able to draw in gas without the need for compression, and providing a very fine dispersion in the mixing tube.Įjectors are characterized by cocurrent plug flow in the mixing tube, with very high energy dissipation rates (typically in the range 100-1,000 W/kg), but short residence times (less than 1 second). This leads to mass transfer coefficients typically 2-3 orders of magnitude greater than a typical stirred tank, making them particularly suited to absorption with rapid, competing chemical reactions where fast mixing is required to reduce byproduct formation. Where longer residence time is required, ejectors are often combined with a contact vessel. In such cases, the ejector provides rapid initial mixing, a fine bubble dispersion and, if properly designed, good liquid mixing in the vessel. Gas can either be recycled, by using the suction characteristics of the ejector to draw gas back from the headspace of the vessel, or operated in once-through mode. #Steam jet ejector design calculation series#.
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