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Mitsubishi Hitachi Power Systems America – Energy and Environment, Ltd.

The Mitsubishi Hitachi Power Systems Enhanced All-Dry (EAD™) scrubber is a simple and flexible technology for multi-pollutant control.  Obtained through a license agreement with Solios Environment (formerly Procedair), this patented dry scrubber technology was developed in the 1980s and is the original “Enhanced” All-Dry process. The process employs an entrained flow absorber, lime/ash humidifying mixer and our fabric filter technology to effectively remove pollutants in utility applications to meet new MATS / CSAPR requirements. We are applying the EAD™ scrubber technology using a modular approach which provides both greater operating flexibility and reliability.

Enhanced All-Dry (EAD)™ Scrubber System

Main Features of EAD™

  • Simple and Reliable Process
    - Reaction occurs in an entrained flow vertical duct with no internals, which is preferred over the more complex fluidized bed processes.
    - Reliable, proven equipment with low maintenance
  • External Reagent Humidification
    - Enhances system reliability by separating reagent humidification and sulfur capture steps. No slurry preparation, no wall build-up.
  • Multi-pollutant Control
    - Meet U-MACT (MATS) requirements of mercury, HCl and PM as well as SO2, and SO3/SAM
  • Modular Design
    - Allows unlimited scrubber capacity and wide turndown capability and enhances system layout flexibility.
  • Low Pressure Drop and Power Consumption

How Does Enhanced All-Dry Scrubber Work?

  • Entrained flow absorber– no fluidized bed
  • Venturi nozzle – promotes turbulence / mixing
  • Humidified ash and lime – enhances reactions on sorbent surface and cools flue gas to optimum reaction temperature
  • Solids recirculation – produces very high apparent stoichiometric ratio
  • Vertical column - additional reaction time and complete drying
  • Fabric filter – collection, additional reaction, recycle

The EAD™ scrubber features a compact, economical design, does not require lime slurry preparation and produces a dry byproduct.