Multi-stage Evaporation plants are one of the most widely used processes for evaporation plants, especially with high evaporation capacities required. The principle is simple. It is the first stage heated with fresh steam, the subsequent stages use steam from the previous stage to heat the heating surfaces. With an increasing number of stages, the use of fresh steam can be significantly reduced.
However, the number of stages can not be increased arbitrarily, since the maximum temperature gradient is usually predetermined. On the one hand, the temperature sensitivity of the medium and the maximum available heating steam pressure play a role and on the other hand, the cooling water temperature.
Thus, an optimum between energy and investment costs must be found, which is determined in close cooperation with the customer. An essential part is the the circuit concept in order to find the optimal design of every individual system.
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