In forced circulation evaporators, the liquor is pumped through a heat exchanger, where an energy source on the shellside heats the liquor on tubeside. The liquor then continues to a flash vessel, where it is depressurized, causing the volatile liquid to vaporize. Any droplets are removed from the vapor in a de-entrainment device at the top of the separator.
The device can be a centrifugal type or a demister. The droplets are then combined with the concentrated liquor. The clean vapor continues to a subsequent effect, a thermocompressor, a compressor or a fan. Learn more about evaporators.
IndustriesDedert forced circulation evaporators are hard at work in the following industries:
| Experience1,500+ 55+ |
Dedert forced circulation evaporators are typically used for solutions and slurries which present a risk of fouling or scaling. Fouling occurs at high temperatures and high concentrations. Scaling occurs with salts that are likely to precipitate. The forced circulation evaporator maintains a full tube, which mitigates these risks. Forced circulation evaporators have longer product residence time and higher liquid volume in the tube. Forced circulation evaporators are used for a variety of applications, including:
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The following are some advantages of Dedert forced circulation evaporators:
The Dedert research facility has a pilot evaporator to test products on a pilot scale and establish correct parameters and material characteristics needed for optimal design and scale-up. Dedert rental pilot evaporators are:
MVR systems recompress the vapor produced in the evaporator using a fan, blower, or high-speed compressor to increase both the vapor pressure and temperature. This recompressed vapor is then returned to the shell side of the heat exchanger where it is condensed, driving evaporation on the tube side. Capacity is controlled by modulating the fan speed with a Variable Frequency Drive, or the flow by inlet guide vanes.
As of 2024, Dedert has provided over 250 MVR systems across 25 countries.
Thermal vapor recompression (TVR) system is more energy efficient than a steam heated system when medium to high pressure steam is available. The motive steam enters through the nozzles and draws in recycled suction vapor. The vapor mixes in the converging section, and the recycled vapor is boosted to an intermediate pressure. Recycling the suction vapor allows for a lower steam consumption. Thermocompressors are more efficient when they are recycling more vapour, producing a lower boost and therefore requiring less steam.
This evaporator condenses waste heat in the form of dryer vapors, ethanol from distillation columns, or cools hot process water to drive evaporation. Dedert was the first to use waste dryer gas as a heating source, receiving a patent in the early 1980s for an all-in-one scrubber and evaporator, which allowed the heat exchanger to accept dryer vapors containing particulates. Dedert has supplied more than 100 waste heat systems across the world, powered entirely by waste fluids.
Dedert dryers
Dedert dryers
A revolution in spray drying
A revolution in spray drying
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