Dehumidifier

Dehumidifier

How does our liquid desiccant dehumidifier work?

The Tema Process dehumidifier is using a Lithium Chloride salt solution as absorbent. Lithium Chloride is a very strong salt and has an equilibrium curve which closely follows the relative humidity curve of air. The process air will enter the countercurrent dehumidifier and will be dehumidified or humidified in order to maintain this equilibrium. In other words the sprayed salt concentration will control the outlet air relative humidity. By cooling the salt solution before spraying we are able to cool down the air temperature. In this way air temperature and air humidity are both controlled in the same system but can be adjusted independently.

As moisture is continuously absorbed by the salt solution inside the dehumidifier, it becomes diluted and slowly loses drying capacity. To evaporate this surplus of moisture the absorbent is pumped to the regenerator unit. Here the process is turned around, so by heating up the salt solution, moisture is released to an outside air stream and exhausted. The salt solution is continuously pumped between the units in order to provide precise conditions to the process.

Lithium Chloride is a chemically stable, non toxic, non-vaporizing salt solution which acts as a biocide to mold, bacteria and micro-organisms. Beyond its physical desiccant nature Lithium Chloride is also an effective antifreeze.

Advantages of liquid dehumidification

  • Dehumidification and air cooling in 1 step
  • Energy friendly: 50-60% more friendly compared to conventional system
  • Usage of low temperature heat sources for regeneration
  • Usage of low cost coolant sources, f.e. cooling tower water or river water
  • Implementation of heat pump
  • Microbiological decontamination
  • Performance reliability, systems run 24/7
  • Precise humidity control (± 1% RH)
  • Frost free cooling
  • Design flexibility
  • Dehumidification and humidification possible

Design principles of the dehumidifier

This image shows the design of an dehumidifier and regenerator

dehumidfier

TEMA Process B.V. is a specialised design and manufacturing company for Fluid Bed Systems for  drying of minerals, chemicals, food, feed, biomass, etc. The TEMA Fluid Bed can be applied not only for drying, but also for cooling, roasting, torrefaction, puffing, blanching, stripping , spices and herbs sterilisation and pasteurisation and calcining.

TEMA Process B.V. manufactures continuous and batch fluid beds. Batch fluid beds are used when products integrity is required for example in the pharma industry or for small quantities of product. Continuous dryers / coolers can be delivered in static or dynamic (shaking, vibrating) fluid beds. Static fluid bed can be delivered with or without submerged heat exchangers.

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