SNCR
Selective non-catalytic reduction
Ammonia (urea or ammonia water) reacts with the harmful nitrogen monoxide (NO) and nitrogen dioxide (NO2) from the flue gas into harmless nitrogen (N2) and water.
The reaction temperature is 880 to 10800 °C (max. range 850 - 1100 °C).
SCR
Selective catalytic reduction
Ammonia reacts with the harmful nitrogen monoxide (NO) and nitrogen dioxide (NO2) from the flue gas into harmless nitrogen (N2) and water.
The reaction temperature is 200 to 450 °C.
ERC - plus
Selective catalytic + non-catalytic reduction
This variant of DeNOX technology combines advantages of both (SNCR and SCR) basic DeNOX technologies.
The ERC - plus process is applied
if strict requirements are made on the secondary ammonia emissions (NH3 slip) and if NOX reduction rates are required which cannot be achieved by the pure SNCR process.
When burning of coal, Petroleum products, natural gas as well as domestic and hazardous waste for energy production, polutants such as nitrogen oxide (NOX) occur despite optimised combustion and sometimes in significant quantities.
By the reaction of nitrogen oxides with other atmospheric components, eg ozone is created, which results in the so-called summer smog. Other reaction products, such as nitric acid penetrate into the water and soil with precipitation as acid rain. The resulting nitrate accumulation has a negative impact on humans, plants, and animals.
In the meantime, allowed emissions in the flue gas have been limited by law in all industrial countries.
ERC as a market and technology leader of DeNOX plants in Europe develops and produces highly efficient, individually tailored denitrification systems for various different combustion plants.
There is also the production and sale of Reducing agents for the operation of DeNOx plants.
Reducing agents:
- satamin (urea solution with an additive) – manufactured by ERC Emise Redukce Concepty s.r.o.
- urea solutions
- ammonia water
- gaseous ammonia
- other ammonia containing chemicals
Main chemical reactions:
- SCR: 4 NO + 4 NH3 + O2 > 4 N2 + 6 H2O
- SNCR: NH2– + NO > N2 + H2O
- Reduction with ammonia: 4 NO + 4 NH3 + O2 > 4 N2 + 6 H2O
- Reduction with urea: 2 NO + (NH2)2CO+ ½ O2 > 2N2 + 2 H2O + CO2
Principled schema DeNOx technology
Secondary Processes for NOx- reduction:
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- SNCR:
- SNCR:
