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Medium-Low Temperature SCR Denitrification Process

Technology Introduction

Conventional SNCR in-furnace denitrification faces emission instability due to temperature fluctuations and low efficiency, making ultra-low emissions challenging. The medium-low temperature SCR process stabilizes denitrification efficiency above 95% at >150°C with optimized catalysts, achieving NOx ≤30mg/m³. Bolaida’s solution adds safety, energy efficiency, and waste heat recovery for reliable, high-performance emission control.

To meet ultra-low emission standards, most enterprises adopt SNCR+SCR hybrid systems for high efficiency and stable emissions.
The key challenge is catalyst selection. With years of engineering experience, Bolaida has optimized catalysts featuring low activation temperature, wide operational range, and high sulfur tolerance.
Proven in projects, our medium-low temperature SCR process excels in biomass boilers, coal-fired boilers, nonferrous smelting, solid/hazardous waste incineration, aluminum electrolysis, industrial silicon, waste incineration plants, etc.

Technology Advantages

Ultra-Low Emissions
Energy Efficiency
Safety & Environmental Friendliness
Waste Heat Recovery

Why Upgrade to SCR?

Items	Medium-Low Temperature SCR Denitrification	SNCR
Ultra-Low Emissions	Reduces NOx concentration to ≤30mg/m³	Maximum NOx reduction to ≤50mg/m³
Denitrification Efficiency	Efficiency up to 95%+	Efficiency ranges from 30%-70%
Temperature Requirement	Operates at low temperatures (150°C-300°C)	Typically requires ≥850°C
Ammonia Slip	Ammonia slip controlled within 3ppm	Unstable reaction efficiency prone to ammonia slip

Medium-Low Temperature SCR Denitrification Principle

NOx in flue gas reacts with ammonia (NH3) over a catalyst to form harmless nitrogen (N2).
4NO + 4NH3 + O2 → 3N2 + 6H2O
NO + NO2 + 2NH3 → 3H2O + 2N2
6NO + 4NH3 → 5N2 + 6H2O
The SCR catalyst is optimized for medium-low temperatures, with an ideal reaction range of 150°C-300°C.

Key Features

01
Modular Design
Compact equipment with small footprint, flexible configuration for easy transportation and installation.
02
Energy Efficiency
Optimized process recovers waste heat from flue gas, significantly reducing operational costs.
03
Low Maintenance
Simple operation with specialized SCR catalysts, offering flexible adjustment and high controllability.
04
Retrofit-Friendly
Seamless integration with existing systems to leverage current equipment and lower investment costs.

Applications (Partial List)

Biomass-fired boiler denitrification
Coal-fired boiler denitrification
Rotary kiln denitrification
Silicone production denitrification
Waste incineration plant denitrification
Aluminum electrolysis denitrification
Metal smelting denitrification
Medical waste incineration denitrification

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