Label：Concentrated Waste， Equipment， Instrumentalized， Controlling and Monitoring
Oct 14, 20206380
Vacuum evaporation is a technique which is characterized by transforming liquid effluent into two flows, one of high quality water and the other comprising a concentrated waste. The water obtained is of sufficiently high quality to be re-used, whereas the waste can be concentrated, even reaching almost total dryness. Waste management costs decrease markedly when concentrating the waste to this extent.
The equipment required is compact, practical and instrumentalized, thus meaning that operational controlling and monitoring are simple and allowing effluent flows of up to 20 m3/h to be treated in a single evaporator. It should also be noted that as the effluent does not need to be heated to high temperatures, as the water boils at 35-40°C (depending on the operating pressure) when working under vacuum, the evaporator’s energy requirements need not be high quality power supplies and excess energy from other processes will be of use in the majority of cases.
Due to the evaporation operation under reduced pressure, the boiling point of the solution is lower than the boiling point under normal pressure. Therefore, vacuum evaporation has the following advantages. Therefore, vacuum evaporator has the following advantages:
1. The boiling point of the solution under reduced pressure is lower than that under normal pressure. Therefore, it can increase the temperature difference between the heating vapor and the boiling liquid at the same pressure, increase the production capacity of the evaporator, and accordingly reduce the heat transfer of evaporation area.
2. Low pressure steam or waste steam can be used as heating steam.
3. It can be used to concentrate the solution that is not resistant to high temperature and easily decomposes.
4. As the boiling point of the solution decreases, the evaporator loses less heat to the outside world.