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