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NOx  Denitration SCR SNCR
NOx Denitration

Denitration is a process of chemically converting nitrogen oxides (NOx) into nitrogen (N2) and water (H2O) by using catalyst to realize NOx removal in the flue gas

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    ACT
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  • DESCRIPTION
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Selective Catalytic Reduction (SCR)
Selective Catalytic Reduction (SCR) is widely applied all over the world as a proven denitration technology, is a process of chemically converting nitrogen oxides (NOx) into nitrogen (N2) and water (H2O) by using catalyst to realize NOx removal in the flue gas. And a gaseous reductant, typically anhydrous ammonia, aqueous ammonia or urea, is added to a stream of flue or exhaust gas and is absorbed onto the catalyst.
ACT owns the most comprehensive DeNOx technologies with the support of state-level R&D center to carry out CFD numerical simulation and physical model test.
When SCR reaction temperature downstream the desulfurization and dedusting system is 250~280℃, the denitration efficiency can be higher than 80%.
Features:
- High NOx removal efficiency (> 90%)
- Excellent reliability
- Mature technology

SCR systemSelective Non-Catalytic Reduction (SNCR)

Selective Non-Catalytic Reduction(SNCR) is a process by injecting ammonia-based reagents into the furnace where the temperature is in the range of 850°C to 1100°C, normally in the upper area of furnace or inlet of cyclone separator. The reagents react with NOx into N2 and H2O, NOx reduction could reach 40-70% under proper reaction condition and temperature, and ammonia slip concentrations could be well controlled.

Features: 

- NOx removal up to 60-70% for CFB boiler, and 40-50% for PC boiler;
- Partition adjustable design, adapt to various conditions with different temperature
- Modular design, simple system with small footprint and low investment

SNCR system

Circulating Oxidation Absorption Denitration (COA) 

Based on hundreds of D-MEC units, ACT has independently developed a co-denitration technology (COA). Normally 95% of NOx is NO contained in the flue gas, and which is insoluble in water, so it’s difficult to remove by using the calcium-based absorbents with water membrane. COA is based on the circulating fluidized bed with intense turbulence, it take the absorbent with large BET surface as the carrier, a special additive is added for oxidation and catalysis, to convert the NO to NO2, then realize the NOx removal by reaction with the absorbent. 

Reaction principle: 

2NO+O2 → 2NO2

3NO2 + H2O → 2HNO3 + NO
Ca(OH)2 + 2HNO3→ Ca(NO3)2 + 2H2O
Features:
- Denitration temperature ≤ 100°C, efficiency up to 40-60%
- Efficiency up to 70-80% combined with SNCR
- Sub-system to D-MEC unit, great investment reduction
- Adapt to various conditions, boiler load range: 30 to 110%
- Modular design, Simple system with small footprint
- No waste water, no secondary pollution
COA system

ACT provides tailor made solutions to each client, please do not hesitate to contact us to obtain professinal flue gas treatment solution for your air quality control concern. 

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