MVR Evaporator Mechanical Steam Recompressor-Design and Function Range

Machines for gas compression operate on the principle of positive displacement or dynamics. In a positive displacement machine, the moving parts of the machine separate the suction chamber and the pressure chamber. The volume of the operating chamber decreases and the gas pressure increases. In the case of a reciprocating compressor, such a process is realized by the movement of a piston in a cylinder. In powered machines, gas energy is supplied by high-speed rotation of the impeller blades. The gas is first accelerated and then decelerated through a diffuser located downstream of the impeller. In this way, high speed is converted into pressure energy. Depending on the direction of fluid flow through the impeller, the relevant equipment is referred to as an axial, mixed flow, or centrifugal compressor. The most suitable compressor type depends on the operating conditions of the relevant application. The key parameters are the pressure rise to be achieved and the flow of steam to be compressed. Π is the ratio of the final pressure p2 to the suction pressure p1 and is defined as the compression ratio. As the evaporation device often operates in the vacuum range, the heating surface load is medium, and the temperature difference is small, so the centrifugal recompressor is usually used.

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