MicroMistTM

Wet ScrubberAdvanced Scrubbing Technology

Ultra-High EfficiencyFossil Fuel Pollutant Capture

TheMicroMist™

Scrubber

Benefits of MicroMistTM Scrubbing Technology

• Lower Energy Consumption - MicroMist System Typically Operates With Less Than 25” W.C. of Total Pressure Drop

• Lower Equipment Costs than Standard Scrubbing• High Capture Efficiencies on Acid Gasses &

Submicron Particulate• High Capture Efficiencies on Condensable Compounds• Retrofits on Existing Equipment = Minimal Down Time• Proven Results!

What’s Different?• Sequence of Scrubbing “Events”• Quenching and Sub-Cooling• Patented System Employing Fine Droplets• Uses Proprietary Dual-Nozzle Contact Trays,

High Efficiency Mist Eliminators with Irrigation• Lower System Pressure Drop Affects the Ability to

Scrub Fine Particulate, Acid Gases, and Heavy Metals in “One System”

• Water Management and Experience • High Flexibility for Varying Gas Flow

Conventional ScrubbersPROCESSEHAUST

VENTURISTAGE

WATER

DRAINDRAIN

SEPARATORSTAGE

SATURATEDGASSES

•Low Particulate Collection Efficiency

•Inefficient Energy Use (>70” W.C.)

•Atomization of Particulate Collection Affects Draft

•Poor Turn-Down

•Little Effect on Condensable Compounds

•Difficult Solids Control

DIRTYSCRUBBEREXHAUST

MicroMistTM Scrubber

•High Particulate Collection Efficiency (>99.5%)

•High Capture Efficiency of Acids & Condensable Compounds (>98.9%)

•High Capture Efficiency of Heavy Metals (95% - 99% + )

•Energy Efficient (System ∆P <25” WC)

•Atomization for Particulate Collection Independent of Draft

•Excellent Turn-Down

•Superior Solids Control & Segregation

Flue Gas

CleanGas

Flue Gas

CleanGas

Stage 1: Quench• Quenching Upstream

of True Venturi Tubes• 95% Particulate Removal • Removal of SO2 & HcL• Separation of Drain Water• < 1” WC Pressure Drop

1

MicroMistTM Scrubber Elements

Flue Gas

CleanGas

2

Stage 2: Sub-Cooling• Conditioning• Agglomeration• Absorption of acid gasses• Removal of SO2 & HCL

and PM > 1 micron

MicroMistTM Scrubber Elements

Flue Gas

CleanGas

Stage 3: PatentedTrue Venturi Stage

• Condensation and Agglomeration of H2SO4, Fumes and Sub-Micron Particulate

• Internal Throat Atomizer Controls Differential Pressure With Varying Process Loads (Control to ~16” WC)

• Correct Droplet Atomization for Maximum Collection Efficiency

• Venturi Design Achieves Multi-Stage Liquid/Particle Differential Velocities for Sub- Micron collection

• Separate Drain for Maximum Liquor Management & Ph Control

3

MicroMistTM Scrubber Elements

Venturi Tubes are “Ideal” Design Incorporating Maximum Particle/Droplet Collisions & Pressure Recovery

ve

loc

ity

(%

)

Dimension along Venturi Element - units

VENTURI THROAT RECOVERY CONE

gases passingthrough droplets

droplets passing through gases

14

29

43

57

71

86

100

0

0 1 2 3 4 5 6

Collection Droplets

Gases and Submicron Particulate

Patented MicroMistTM Venturi Stage

Vertical Centrifugal Pumps Atomization Through HydroMist Nozzles at the Inlet of Each Venturi Tube and

Independent of Throat Velocity. Internal Throat Atomizer Modulates (Pump VFD) To Maintain Specified

Pressure Drop Across This Stage

Flue Gas

CleanGas

4

Stage 4: Separation• High Efficiency Separator Stage

Combination of Dual Orifice Contact (DOI) trays with Mist Eliminator

• “Flushing” Removal of Dirty Water Droplets With Irrigation And Backwash Spray Nozzles

• Prevents Carry Over of Water into Scrubber Outlet

MicroMistTM Scrubber Elements

Additional Features• Maximize Re-use Water

With Recirculation Tanks• Minimize Fresh Make-up Water• Experience with PH Control• Steady ∆P Across All

Process Operating Conditions• No Hassle Maintenance• Proven Results With All

Fuel Sources (Coal, Oil, NCG)• “One System”

Air Pollution Control Option • UL Listed Control Enclosures

With Fully Automated Control Capabilities

MicroMistTM Scrubber

Emissions Control Technology Comparison

PM(front)

PM(back)

SO2 H2SO4

MicroMistTM Scrubber x x x x

ESP x - - -ESP & SO2 Scrubber x some x -ESP, SO2 Scrubber & WESP

x x x x

Baghouse x - - -Baghouse, dry lime injection

x - some -

Piloting the MicroMistTM

Scrubber• Pilot testing emissions control applications is

the most effective way to predict performance, operating conditions & chemical consumption.

• Pilot units must be accurately “scalable” to ensure correct and predictable results

• Pilot units must be modular to allow simple addition and subtraction of process stages

Test Capacity = 6,000 ACFMProduction 8” Venturi Tube

Incorporates Patented StarTM WESP Technology

MicroMistTM Scrubber Field Testing Pilot Equipment

EME1 QUENCH

2 SUB-COOL

3MicroMistT

M VENTURI 4SEPARATOR

ALL MOUNTED ON A FLAT-BED FOR CONVIENENCE

Why try the MicroMistTM Scrubber Pilot?

• Cost Effective Test of System Efficiency• All Equipment Arrives on Site Together• Easy, Convenient, and Compact• Complete Engineering Assistance• Includes All Required Instrumentation• Includes Production 8” Venturi Tube in MMV Stage• Test Ports in Multiple Locations• On-site Field Service Technicians• “One System” Solution To Pollution Control