Thermal Evaporation Technology
The HWS Series of vacuum evaporators are powered by thermal energy, either steam, or hot water from a waste heat source.
The evaporation/concentration system operates with heat exchangers located in the boiling chamber where they are immersed in the waste to be treated.
The waste is heated under vacuum to foster evaporation with distillate recovery in the condensation zone in the with an external cooling supply fed to the condensation heat exchange.
The cold water is usually from a closed-circuit dry-coolers or evaporation cooling towers.
Applications Include, Leachate, RO Reject, Digestate, Salt recovery & Hazardous waste concentration.
IWE HWS R Concentrator
By means of an automatic motorized scraper, which continuously keeps the heat exchange surfaces clean, higher concentrations are obtained than with other evaporative systems.
The final concentrate will eventually be discharged by means of a diaphragm or progressive cavity type pump, or by placing the system above a raising frame, so that discharge through the bottom discharge valve can be made directly into a crystal separation system.
HWS R Evaporator In Operation
1. Wastewater enters the boiling chamber.
2. Thermal energy (Steam or Hot water > 70 °C) is introduced to the external heat jacket. The heat jacket surface is maintained clean by the internal scraper/wiper system.
3. Vacuum is generated in the Vacuum distillate circuit with a venturi assembly.
4. Waste begins to boil and generates steam which is directed to the plate heat exchanger.
5. Steam is condensed in the heat exchanger with cooling from the external cooling circuit.
6. Distillate is directed to cooling chamber, with temperature maintained by the heat pump chilling circuit.
7. After full concentration the final waste exits the boiling chamber and is collected for external disposal or recovery.
Belmar Can provide a turnkey system including salt dewatering. Systems can also include a screw conveyor for salt slurry collection.
IWE HWS
Modular multi-effect vacuum evaporator, suitable for the concentration of medium-large flow rates of waste waster from a minimum of 100 l/h up to 15.000 l/h.
HWS evaporators are offered in Single , Double ( 50% Less Energy ) and Triple Effect configuration ( 66% Less Energy ).
- Innovative parallel plates heat exchangers.
- EASY OPENING system for a quick and simple maintenance.
- Automatic operation controlled by PLC with display of the main parameters on the TOUCH LCD display.
- Standard build in AISI 316 L – special alloys on request.
Thermal Evaporator Applications
Single or modular multiple effect vacuum evaporator, for the effective concentration of water-based solutions. To be applied whenever alternative source energy are available. It can be powered with hot water, steam, diathermic oil. Ideal to recycle any waste heat and to be combined with alternative source boilers.
Suitable for all industries where an extremely limited maintenance is required. Ideal in the die-casting, heat treatment, Ion Exchange regeneration waste, RO rejects, chemical & pharmaceutical waste, pickling – surface treatments & landfill leachate, biogas digest and washing waste.
Material Options
- Standard construction in AISI 316 L stainless steel for less corrosive applications
- High Chloride Applications materials such as DUPLEX (SAF 2205), SUPER DUPLEX (SAF 2507)
- Corrosive applications - SILICON CARBIDE, GRAPHITE, TITANIUM and special FLUOROCARBONIC RESINS