Introduction of the pre-evaporator in the existing scheme of the evaporator station with co-current juice flow without installing a new apparatus

Abstract

A pre-evaporator is installed in an existing evaporator station with co-current juice flow without adding a new evaporator vessel. The mass and heat balances are compared for both cases. The analysis shows that with such a change the parameters (temperature, flow rate) of the bleed vapors of the 3rd, 4th and 5th effects will result in the need to enlarge the heating surface of several juice heaters. It will also be necessary to increase the vapor parameters of the effect supplying the evaporating crystallizers either by increasing the pressure of the exhaust steam supplying 1st effect or by relieving pre-evaporator through switching the supply of the juice heater from this effect to bleed vapors of another effect.