AMMONIA SYSTEMS FOR SCR APPLICATIONS
Having supplied over 50,000 Megawatts of Utility, IPP, and Industrial Power ammonia systems, WAHLCO understands the critical nature and reliability requirements of ammonia handling and injection equipment for SCR Applications. WAHLCO supplies virtually all commonly used types of ammonia unloading, storage, vaporization and handling systems, from industrial applications of a few pounds per hour to Utility Boiler Applications requiring up to 4,000 pounds per hour of ammonia. WAHLCO approaches each project as a team member, insuring the equipment will correctly integrate within the overall SCR system and is uniquely qualified to meet all of your project requirements of ammonia handling.
Ammonia Overview
Ammonia reagent is typically supplied as commercial grade anhydrous ammonia or aqueous ammonia. Anhydrous ammonia is significantly less expensive for SCR applications; however, aqueous ammonia is often specified due to permitting and safety considerations in transport, storage and handling. Commercial grade anhydrous ammonia is 99.5 - 99.7% pure, with a minimum of 0.3% water content. Aqueous ammonia or ammonia hydroxide can be specified and purchased over a range of ammonia contents.
Typically, aqueous ammonia is specified at concentrations of 19.5%, 25%, or 29% pure ammonia in water. Due to the additional cost, typically 4 – 5 times as expensive (on a basis of weight of pure ammonia) as anhydrous ammonia, and the additional cost of transport and storage of the water content, aqueous ammonia is used only when anhydrous ammonia is not a viable option. Aqueous ammonia is also significantly more expensive to vaporize due to the energy required to evaporate the water content.
For utility SCR installations, anhydrous ammonia will always be a more economical reagent selection that aqueous ammonia. The disadvantage of anhydrous ammonia is that it is classified as a hazardous material, and is subject to strict regulations and Risk Management Procedures for transport, storage, and handling. These requirements result in additional costs and complications in permitting and may generate local community concerns over transporting hazardous materials. Aqueous ammonia below 20% concentration requires minimal special handling or permitting (check with local supplier for specific requirements).
Products & Services
- Unloading Systems
- Storage Tanks & Accessories
- Forwarding / Feed Pump Skids
- Anhydrous Ammonia Vaporizers
- Electric
- Steam
- Hot Water
- Aqueous Ammonia Vaporizers
- Hot Gas Recirculation
- Combustion Air
- Electric Air Heaters
- Ammonia Flow Control Units (AFCU’s)
- Ammonia Injection Grids (AIG’s)
- Design & Fabrication
- Full Turnkey Systems
- Start-Up Maintenance Services
- O&M and Safety Training
