Add Time: 2018-08-18 17:18:29
1. Divided by evaporation:
Natural evaporation: That is, the solution evaporates at a temperature lower than the boiling point, such as sea salt. In this case, because the solvent only vaporizes on the surface of the solution, the solvent evaporation rate is low.
Boiling evaporation: The solution is heated to the boiling point and allowed to evaporate in the boiling state. This is basically the case for industrial evaporation operations.
2. Divided by heating method:
Direct heat source heating is an evaporation process in which fuel and air are mixed, and the high-temperature flame and smoke generated by combustion are sprayed directly into the evaporated solution through a nozzle to heat the solution and vaporize the solvent.
The indirect heat source heats the walls of the container to the evaporated solution. That is, the heat transfer process in the partition heat exchanger.
3． Divided by operating pressure:
Can be divided into atmospheric, pressurized and reduced (vacuum) evaporation operations. Obviously, for heat-sensitive materials, such as antibiotic solutions, fruit juice, etc., should be carried out under reduced pressure. High-viscosity materials should be heated by pressurized high-temperature heat sources (such as thermal oil, molten salt, etc.) for evaporation.
4． Divided by effect:
Can be divided into single-effect and multi-effect evaporation. If the secondary steam directly condensed by evaporation is no longer used, it is called single-effect evaporation. If the secondary steam is used as the next effect heating steam, and multiple evaporators are connected in series, this evaporation process is multi-effect evaporation.