Mechanical vapor recompression arrangement

A mechanical vapor recompression (MVR) arrangement, comprising a compound turbine system, a pressure-tight enclosure provided with a first end and a second end, having an essentially circular cylindrical elongated shape along a longitudinal axis A, and being essentially horizontally oriented during operation of the arrangement, and a central tube having an essentially circular cross-section and running within said enclosure along said longitudinal axis A and configured to allow steam to flow from the second end to the first end of the enclosure, the MVR arrangement further comprises at least one evaporation compartment E1, arranged within said enclosure along the longitudinal axis A, said at least one evaporation compartment comprises two essentially planar and circular sidewalls, and is provided with a plurality of longitudinal pipes running from one sidewall to the other sidewall, and that the circular sidewalls are provided with openings for said plurality of pipes,

• wherein the MVR arrangement further comprises an inner central tube arranged concentrically within said central tube and running from said second end to, or towards, the first end, wherein said inner central tube has an outer diameter related to the inner diameter of said central tube such that a steam flow conducting space is provided between an outer surface of the inner central tube and an inner surface of the central tube, said longitudinal pipes are parallel to, and located around, said central tube,
• wherein the compound turbine system comprises a turbine assembly comprising a turbine provided with axial turbine vane members arranged at least partly within said inner central tube and structured to provide steam to flow in an axial direction along the longitudinal axis A within said inner central tube from said second end towards said first end, the turbine assembly also comprises a motor (20) for rotating said turbine, wherein a flow connection member is arranged, structured to provide a flow connection between said steam flow conducting space and the space within the inner central tube, and wherein said turbine is provided with a flow increasing structure arranged in proximity of said flow connection member, such that the flow within the steam flow conducting space and the flow within the inner central tube are combined into one flow, and the combined flow, being a high pressure steam, is led through said longitudinal pipes from the first end to the second end of the enclosure,
• wherein the MVR arrangement further comprises a first steam connection arrangement structured to provide a low pressure steam flow from said at least one evaporation chamber(s) to enter the inner central tube at the second end, and a second steam connection arrangement structured to provide said high pressure steam to enter the steam conducting space at the second end, wherein the low pressure steam and high pressure steam are combined into one steam flow in the proximity of said flow connection member.