Co-Generation w/ Hot or Cold Water Evaporators

Hot/cold water evaporators enable the use of low or no cost energy sources – excess hot water or steam that is already available from cogeneration or cooling plants. Using existing waste heat to power the evaporation process reduces operational costs to only the power needed to run the recirculating pumps and/or scraper.

Hot/Cold Water Evaporators feature:

  • Vacuum evaporation conditions: 4 – 30 kPa (0.6 – 4.4 PSIA)
  • Lower Boiling Temperatures: 30 – 70 °C (86 – 158°F)
  • Low electrical energy consumption (cooling and heating circulating pumps): 12-30 kWh/ton of distillate (0.045-0.11 kWh/gal)
  • Efficient consumption of energy from hot water/steam: 300/600 kWh/ton of distillate (1.1/2.3 kWh/gal)
  • Utilization of waste heat energy from cogeneration plants or process streams, reducing operational costs
  • Single and multiple effect units available

The evaporators are available in two series using different heat transfer technologies:

AC F Series

Hot/Cold Water evaporator with forced circulation and external shell & tube heat exchangers

  • Designed to take advantage of available waste heat
  • Capacities range from 20,000 – 60,000L (5,300 – 15,800 gal) of distillate production per day
  • Forced circulation reduces rates of scaling and fouling

The AC F series evaporator is a hot/cold water evaporator with forced circulation and external shell & tube heat exchangers. The heat necessary to boil the wastewater is delivered by customer supplied hot water; the cooling necessary to condense the vapor is delivered by customer supplied cold water.

AC R Series

Hot/Cold Water evaporator with external shell & tube heat exchanger and scraped heating surfaces

  • Designed to take advantage of available waste heat
  • Capacities range from 3,000 – 12,000L (790 – 3,200 gal) of distillate production per day
  • Scraped surfaces allow treatment of precipitating waste streams or crystallization of concentrate to achieve Zero Liquid Discharge (ZLD) goals

The AC R series evaporator is a hot/cold water evaporator/crystallizer with a scraped boiling chamber and a hot water heating jacket. This series is designed to treat wastewater containing a high concentration of suspended and/or dissolved solids. An Archimedes-screw type scraper prevents any fouling of the heat exchange surfaces. An RW unit often follows a primary evaporator in series to provide further concentration or crystallization of the concentrate.

With the addition of an optional intermediate heat exchanger, RW evaporators can also utilize excess steam as a heat source. Optional heat pump conversion kit enables operation when excess hot water or steam is not available.