deNOx
NOx Reduction Technology
Reduction of nitrogen oxide emissions: combustion process optimization, primary methods, secondary non-catalytic SNCR and secondary catalytic SCR The areas of activity include reduction of nitrogen oxides and adaptation of solid fuel-fired boilers for co-firing and biomass combustion. The volumetric combustion system offers state-of-the-art solutions for optimizing combustion processes by fitting into the broader primary methods. With the help of asymmetrically distributed secondary air nozzles in the combustion chamber, the flue gases are put into a strong rotational motion. The rotary motion intensifies the mixing process and prevents flow stratification. Perfect mixing leads to an even temperature distribution in the combustion chamber. The technology ensures optimal combustion conditions throughout the entire volume of the combustion chamber and enables: NOx reduction without the use of additional reactants, efficient optimization of the combustion process, CO2 reduction.
Secondary non-catalytic methods
SNCR system
SNCR System
The SNCR system fan improves distribution of a reagent (urea or ammonia water) in a furnace and allows a precise control of reactions that occur in the boiler.
Dilution Station
This station is responsible for water and urea intake from day tanks, monitoring of concentration values and the transfer of the reagent in proper concentration to the distribution station. Components of the system are pumps responsible for water and urea transfer. A displacement pump with a frequency converter is used to transfer urea, whereas a centrifugal pump equipped with an inverter is used to transfer water. A flow and density of the diluted urea are measured by a multiple-parameter Coriolis mass flowmeter, which is located downstream a static mixer
Urea Transfer and Recirculation Station
A multi-stage centrifugal pump is used for a quick supply of urea to the day tank. This device is also responsible for keeping the urea in a constant motion and at sufficiently high temperature, to avoid its crystallization. A source of heat in the system may be both steam and electric current. The station has a double skid of pumps and heaters.
Day Tanks
Day tanks are used for a short-term storage of urea and water for the dilution station. The urea day tank reduces a demand for continuous recirculation of urea. The tanks are separated, to eliminate potential contamination of water by urea.
Distribution Station
The station supplies urea of concentration 10-20% to injection devices installed at the boiler. One station serves four injection devices.
Injection Devices
Injection devices are responsible for injection of urea solution into the furnace chamber. Their design has been developed based on an extensive experience and testing, which resulted in enhancement of NOx reduction and reduced urea consumption.
Urea Storage Tank
An insulated tank made of glass fibre reinforced plastic is used to store the urea. A size of the tank is determined individually for each system.
SCR method
Nitrogen oxides reduction technologies with the SCR method:
- Reduction of nitrogen oxides and dioxides in the gaseous phase
- High efficiency of NOx reduction with a small slip of ammonia (NH3)
- Lower reagent consumption compared to non-catalytic methods
- Wide application range with regard to the process, fuel and flue gas temperature
TAIL-END
HIGH – DUST
HIBRID
HDS technology
Hybrid technology of flue gas denitrification in power boilers. Why this technology? The hybrid technology of flue gas denitrification in power boilers has the following advantages:
- does not entail high investment costs,
- no need to deeply interfere with the existing infrastructure in the facility,
- does not require additional operating procedures
- the use of SNCR and catalytic baskets allows for the achievement of new emission limits,
- reduces the risk of ABS precipitation,
- reduces the ammonia leakage, making it possible to meet the limits of its emission in the exhaust gas and to maintain the commercial value of combustion by-products.