Selective catalytic reduction (SCR) has long been a common means to reduce NO x emissions from industrial power generation equipment. However, concerns over the safety and potential liability of anhydrous ammonia used as a SCR reagent are growing. Likewise, the costs associated with aqueous ammonia have driven many power generators to look for additional alternate means of reducing NO x.

The Fuel Tech NO x OUT SCR process delivers a safer and simpler method of operation.

The Problem with Ammonia Both anhydrous and aqueous ammonia present operational and handling problems when used as an SCR reagent. Anhydrous NH 3 typically requires substantial tankage, relief valves, heated vaporizer, and other features. Aqueous ammonia typically requires heating to evaporate the water. Many systems are equipped with a fan and ammonia injection grid (AIG) to distribute dilute ammonia to the catalyst surface.

Transportation of ammonia on public highways is generally considered a safety hazard. Storage vessels are often required to be fitted with special containment and safety features. Fire and safety concerns require evacuation procedures and emergency training. Evacuation plans, public notification, and special permits may be required by government authorities.CombustionZone In-Duct Catalyst Reactor

Furnace NOxOUT ® Reagent Figure 1: The NO x OUT SCR Process 

## NO X 

## OUT SCR ® 

## , is a cost-effective, safer and simpler alternative to NH 3 

## SCR for industrial generators.

NO x Reduction Process

TECHNICAL BENEFITS

■ Up to 85% 

### NO
x reductions

■ Eliminates anhydrous

ammonia and aqueous ammonia handling and storage requirements

■ Safer reagents require less

support equipment

■ No fouling

■ Eliminates RMP hassle TECHNICAL BENEFITS

■ Up to 85% 

### NO
x reductions

■ Eliminates anhydrous

ammonia and aqueous ammonia handling and storage requirements

■ Safer reagents require less

support equipment

■ No fouling

■ Eliminates RMP hassle FuelTech 9116 7/11/01 9:40 AM Page 1The NO x OUT SCR Solution NO x OUT SCR is an advanced form of selective catalytic reduction (SCR) system. Unlike the conventional SCR, NO x OUT SCR incorporates a safe, easy-to-use reagent. The safe alternative reagent liberates ammonia which reacts with NO x on the catalyst surface. A simple injection system is designed to ensure “clean” injection with high conversion to NH 3 . NO x OUT SCR provides high levels of NO x control, similar to the conventional SCR. No Fouling Typical operation of the NO x OUT SCR process yields no buildup or fouling of catalyst surfaces. Injectors stay clean, and there is often no increase in generator back pressure or decrease in generator performance or efficiency.

In all respects, NO x OUT SCR offers the same NO x reduction performance of an SCR system using anhydrous or aqueous ammonia, without the downside risks and catalyst build-up. Figure 6: Transportation classification data NO x OUT Reagent vs. NH 3

For more information on NO x reduction programs available from Fuel Tech, call, fax, or write us at:

Fuel Tech, Inc. • 512 Kingsland Drive • Batavia, IL 60510

Phone 800.666.9688 • 630.845.4500 • Fax 630.845.4501 www.fueltechnv.com • webmaster@fueltechnv.com

NO x OUT and NO x OUT SCR are registered trademark of Fuel Tech, Inc. 

### 0 0


## Area Velocity NO x OUT ®



## SCR Performance ParametersAmmonia Slip as a Percent of Injected Chemical

NO x OUT Reduction NH 3 /NO x Ratio

Ammonia SlipPercent NOxReduction



### 10 20 30 40 50 60 70 80 90 100

0% 8% 15% 22% 30% 38% 45% 52% 60% 67% 75%

10 20 30 1.0 0.9 1.8 0.7 0.6 

# 1 0 **0 3 0**  **1**

NO xOUT REAGENT AMMONIA

© 1999 Fuel Tech, Inc. FT-9116-AP

Figure 3-4: A large capacity turbo-diesel with a retrofit twin bed catalyst system. Figure 5: NO x OUT SCR provides flexible performance with a safe reagent HEALTH HAZARD 4 - Deadly 3 - Extreme Danger 2 - Hazardous 1 - Slightly Hazardous 0 - Normal Material

SPECIFIC HAZARD Oxidizer OXY Acid ACID Alkali ALK Corrosive COR Use NO WATER W Radiation Hazard FIRE HAZARD Flash Points °F 4 - Below 73 3 - Below 100 2 - Below 200 1 - Above 200 0 - Will Not Burn

REACTIVITY 4 - May detonate 3 - Shock/heat may detonate 2 - Violent chemical change 1 - Unstable if heated FuelTech 9116 7/11/01 9:40 AM Page 2