1st Quarter Conf Call 5.7.10
China NOx Emission Prevention and Control Policy
FTEK 2009 Annual Report
FTEK Investor
Presentation
AIR POLLUTION CONTROL NOxOUT® and HERT™ SNCR Systems (brochure)
NOxOUT® and HERT™ SNCR Systems
- Urea-based Selective Non-Catalytic Reduction (SNCR)
- 25% - 50% NOx Reduction
- Customized Solution for Each Application
- Easy to Retrofit - Little Downtime Required
- Low Capital Cost
- Can be Combined with Other NOx Reduction Technologies
- Safe Reagent
- Over 580 Installations Worldwide
Fuel Tech’s urea-based Selective Non-Catalytic Reduction (SNCR) Process is a post-combustion NOx reduction method that reduces NOx through a controlled injection of an aqueous urea solution into the combustion gas of utilized industrial sources including: fossil-fired units, waste-fired boilers, furnaces, incinerators, or heaters.
Fuel Tech has enhanced the basic SNCR technology by developing chemical injection hardware, widening the applicable temperature range, and applying process control expertise required for commercial applications.
Fuel Tech has two urea-based SNCR technologies: NOxOUT® systems, which utilize low energy and air atomized injectors, and HERT™ High Energy Reagent Technology, which utilize mechanically atomized injectors and carrier air for injection into the furnace.
The NOx-reducing reaction is temperature sensitive: the optimum temperature range is specific to each application. The reagent needs to be distributed within this optimum temperature zone to obtain the best performance.
The most commonly used reagent consists of a 50% urea solution. This reagent is readily available and requires no special safety precautions for handling.
SNCR ProcessesFuel Tech’s SNCR Processes are designed with the aid of Computational Fluid Dynamics (CFD) and Chemical Kinetic Modeling (CKM) in addition to results from field tests. The CFD model simulates flue gas flows and temperature inside a unit while the CKM calculates the reaction between urea and NOx based on temperature and flow information from CFD. The combination of these two models determines the optimum temperature region and the optimum injection strategy to distribute the reagent.
Fuels
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Commercial Combustion Units
- Tangentially-Fired Utility Boilers
- Cyclone-Fired Utility Boilers
- Wall-Fired Utility Boilers (wet & dry)
- Refinery Crude Heaters and CO Boilers
- Sludge Combustors
- Industrial Power Boilers
- Municipal Waste Combustors
- Incinerators
- Circulating Fluidized Bed Boilers
- Stoker-Fired Boilers Burning Wood and Coal
- Package Boilers
Process Combustion Units
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Chemical injectors developed by Fuel Tech facilitate the reagent distribution. The NOxOUT® injection system utilizes air-atomized injectors which direct the urea solution into the combustion gas path. The droplet size distribution and spray coverage promote efficient contact between the chemical and the NOx in the flue gas.
The HERT™ injection system utilizes mechanical atomizers which carry the urea into the furnace using a high energy air stream. Fuel Tech evaluates both for each specific application and offers the best solution for the customer’s needs.
Fuel Tech’s SNCR Processes provide effective boiler load following capabilities to maximize overall NOx reduction.
Through computer modeling and proven field experience, an injection strategy is developed that makes use of multilevel injection, control of reagent concentration, droplet size and spray patterns, as well as jet penetration. NOxOUT® and HERT™ systems are applicable on various types of units firing many different fuels, which has been verified by years of field-testing. Since SNCR is a post-combustion process, unit size, boiler type and fuel type can be accommodated in the customized process design.