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Ammonia Injection System

The ammonia injection system operates by monitoring and controlling process parameters to achieve precise ammonia dosing.
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Ammonia Injection System

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  • Product Description

  • The ammonia injection system operates by monitoring and controlling process parameters to achieve precise ammonia dosing. Taking a typical denitrification ammonia injection system as an example, liquid ammonia is first pumped from the storage tank and thoroughly mixed with air supplied by the dilution blower in an ammonia–air mixer. Subsequently, based on measurements from NOx and O₂ analyzers at the SCR inlet and outlet, as well as flue gas temperature and flow rate, the required ammonia injection rate is calculated. The controller then adjusts the opening of the ammonia flow control valve according to these calculations, precisely regulating the flow of the ammonia–air mixture. Finally, the mixed gas is injected through an ammonia injection grid into the reactor’s inlet duct, where it is fully blended with the flue gas before entering the SCR reactor. There, a denitrification reaction takes place, converting nitrogen oxides in the flue gas into harmless nitrogen and water.

    Application areas

    Flue gas denitrification: In industries such as thermal power generation, steel, and cement, the combustion process generates large volumes of flue gas containing nitrogen oxides (NOx). As a critical component of both selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) denitrification technologies, the ammonia injection system introduces ammonia into the flue gas. Under the action of a catalyst (in the SCR process) or at specific temperature conditions (in the SNCR process), ammonia reacts chemically with NOx, converting it into nitrogen and water, thereby reducing NOx emissions in the flue gas and mitigating environmental pollution.

    Water treatment: Ammonia injection systems also play an important role in water purification processes.

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