If fossil fuel is burnt, nitrogen component in fuel and nitrogen in combustion air become oxidized, creating nitrogen oxide (NOx).
SNCR (Selective Non-Catalytic Reduction) denitrification facility sprays ammonia or UREA within the combustion furnace without catalyst and converts nitrogen oxide into nitrogen and water vapor.
Characteristics
Catalyst is not required for NOx and reductant reaction
Reaction temperature is 850~1,050℃
Reductant is injected within the boiler’s combustion furnace so separate reaction tower is not required
Reactant is substance created during combustion such as CO2, H2O, N2
Wide application scope
Convenient installation and low investment cost
Field of application
Various combustion equipment such as power generation/industrial boiler and incineration furnace
Selective Catalytic Reduction, SCR
Principle
Overview
If fossil fuel is burnt, nitrogen component in fuel and nitrogen in combustion air become oxidized, creating nitrogen oxide (NOx) and SCR (Selective Catalytic Reduction) denitrification facility uses a catalyst to convert nitrogen oxide into nitrogen and water vapor.
Characteristics
Convenient response despite frequent load change
Outstanding treatment efficient (above 95%)
Reaction temperature is 180 ~ 500℃so it is highly efficient in low temperature and high temperature
Denitrification equipment system design with optimal efficiency through simulating (flow analysis)
Low SO2 and oxidation rate so low generation of toxic substances
Semi Dry Reactor, SDR
Principle
Liquified calcium hydroxide (Ca(OH)2) which is a neutralizer, air and water are sprayed in the form of particle with a diameter of tens to hundreds of micrometers to drop hazardous gases such as hydrogen chloride (HC1), sulfur oxide (Sox), hydrogen fluoride (HF), Volatile Organic Compound (VOC) to the bottom by classifying them into solid dust and gas such as water vapor
Characteristics
Outstanding reactivity so the consumption of absorbent is less and concentration of reactant is high
Scale and abrasion are less so the maintenance and management cost is low
Doesn’t produce white lead
Reactant can be reutilized as byproducts
Device is simple, installation area is small and installation is convenient
Field of application
Incineration furnace flue gas treatment system
General waste incineration flue gas
Industrial boiler flue gas of high flow heavy oil combustion
Bituminous boiler flue gas for combined heat and power generation
