In multi-stage evaporation, the vapor from the liquid medium is used to heat the subsequent stages. As a result, the use of primary steam can be significantly reduced and the system operated cost and energy efficient.
GIG Karasek has been a leading supplier of the following concepts for years:
Multi-stage evaporation is 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 live steam, the subsequent stages use the Brüdendampf the previous stage for heating the heating surfaces. With an increasing number of stages, so the use of live 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, 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 role is played by the circuit concept in order to find the optimal design of a system.