Industrial Evaporation Wastewater Effluent Treatment Multiple Effect Forced Circulation Evaporator Design

The introduction of Waste heat evaporator

A waste heat evaporator useslow grade water vapor that normally would be wasted as the heat source for the evaporator system.  In the starch industry there are dryers for fiber, gluten, and germ.  In the ethanol industry there are dryers for DDGS.  In the dryer exhaust gas, the ratio of water vapor to air is high enough that a meaningful amount of water vapor can be used as a replacement for steam in the evaporator.  Also, during the saccharification process when starch is converted to glucose, low pressure water vapor is generated.  This water vapor can also be the heat source in a multiple effect evaporator operating under vacuum. 

The evaporator can be designed to use multiple sources of waste heat in one system.  The waste heat can be supplemented with steam to increase the capacity.  The dryer exhaust gas that passes through the evaporator and is vented to atmosphere will have considerably less dust and VOC than the original dryer gas.  A scrubber can be integrated with the system to reduce SO2 emissions.

Application

Applicafims steepwater, ethyl stillage, process waste water and glucose etc.

Project Cases