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Pulse Drying

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					Pulse Drying

What is it?
             Pulse Drying


• Pulse drying is a relatively new technique
  for rapidly drying high moisture/medium
  solids feed streams into a much more
  manageable dry powder form.
            How does it work?
• The basis for the technology is the use of a pulse
  combustion burner. The burner, which is similar to the
  pulse burner used in the Fulton Boiler Company heaters,
  is aerodynamically designed to produce a pulsating gas
  flow within the burner system, along with the heat
  release, which is used for evaporation. In a continuously
  operating pulse burner the divergent exhaust nozzle
  amplifies the discreet detonations into an approximately
  250 hertz waveform in the downstream hot exhaust
  gases. This combination of pressure waves and heat is
  used for drying free flowing, high moisture and medium
  solids feed streams.
The Pulse jet
     What will it accomplish?


• The availability of drying systems and
  simple user friendly equipment for
  remediation of contaminated sludge in all
  developed and developing nations and in
  economically depressed nations is
  unlimited.
      What will it accomplish?
• There are many reasons for this, mostly of
  an economic nature. The availability of
  sites for development in the developing
  nations and the emergent economies is
  limited because many potential sites are
  contaminated by hazardous, radioactive or
  chemical waste. Before any development
  can take place it is first necessary to clean
  up these waste streams and unusable
  sites.
      What will it accomplish?
• This needs to be done using a simple and
  cost effective system, which can be
  relocated to these sometimes
  technologically and logistically isolated
  areas. The very high-tech complex
  approach being pursued in the developed
  nations is and may always be unavailable
  to these remote locations because of their
  high operating and disposal costs and
  their complexity of operation.
A mobile unit
A stationary unit
The Pulse burners
A schematic
                  The process
• The combustion gases travel into the Pulse Drying
  section (a divergent nozzle) where the water is
  evaporated from the atomized sludge mixture. This
  process greatly increases the surface area of the
  particulate exposed to the hot gases and encourages the
  outward migration of internal water to the molecular
  level. A multi stage cyclone is then used to separate the
  dried particulate from the vapors and dust created by the
  process and a particulate filter is employed to collect the
  dust emerging from the cyclone. Finally HEPA filters are
  employed to remove any remaining traces of dust from
  the exhaust. At this point in the process the temperature
  of the gas stream is less than 300 F.
                The installation
• The Pulse Dryer System is a self-contained process that
  can be rapidly mobilized at almost any location. The
  whole Drying System and its Control Module may be
  mounted on a road capable trailer. The only
  requirements at the site are a support pad, electrical and
  a fuel supply. Additional shielding and ventilation that
  may be required for greater than low-level radioactive
  sludge can be added at the site. Arrangements can be
  made for filter change-out, initial sludge treatment and
  final product handling. The electricity and gas
  requirements total about 50 Kw, 440v/60Hz 3 Phase and
  a supply of propane, natural gas or liquid fuel. Sound
  shielding can be provided as required.
               The operation
• Several options are available for the packaging
  of the final dry product. Metal Drums or High
  Integrity Containers, for some wastes, binders
  can be added of different types including clays
  for the disposal of mixed wastes. It would also
  be possible to vitrify the dry product if desired.
  Following completion of the project Pulse Dryers
  modular construction allows for ease of
  disassembly with a minimum of contaminated
  components which can be easily cleaned for re-
  use or free-release.
                 Summary
•   The most efficient drying process known
•   Simple to understand and operate
•   Mobile, can go just about anywhere
•   Available on short notice
•   Low man-power usage (1 person per shift)
•   Is self-contained
•   Works 24 hours per day if required

				
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