Enhanced All-Dry Scrubber, EAD

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.

Mitsubishi Hitachi Power Systems Americas, Inc.

400 Colonial Center Parkway  |  Lake Mary, FL 32746 USA




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