Why is Denoxification crucial for industrial activities?
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Denoxification (DeNOx) is a critical issue for plant managers seeking to reduce pollutant emissions and comply with environmental standards. Nitrogen oxides (NOx), produced during combustion in industrial plants, are major air pollutants that contribute to air pollution and pose risks to public health.
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EXPERTISE.
Servithen draws on its 38 years of expertise in neutralization processes to provide you with solutions tailored to your needs in the design, manufacture and installation of SNCR and SCR DeNOx, balancing technical performance with CAPEX/OPEX control.
MULTIDISCIPLINARITY.
Servithen mobilizes a team of engineers with a wide range of skills, capable of designing complete solutions in strict compliance with current standards.
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How does Denoxification work and what methods should be used?
Denoxification process
Denoxification aims to transform NOx into nitrogen (N₂) and water (H₂O) through chemical reactions. The two main methods are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR).
Selective Non-Catalytic Reduction (SNCR)
SNCR involves injecting a reducing agent, such as ammonia (NH₃) or urea (CO(NH₂)₂), into the combustion chamber at temperatures of 850 to 1050°C. NOx is then reduced to nitrogen and water without the need for a catalyst.
Selective Catalytic Reduction (SCR)
The SCR process uses a catalyst to facilitate NOx reduction at lower temperatures (250 to 350°C). A reducing agent is injected in the presence of the catalyst, enabling more efficient conversion of NOx into nitrogen and water.
The choice between SCR and SNCR depends on a number of factors: the required level of NOx reduction, investment and operating costs, space availability and specific process conditions (exhaust gas temperature, operational complexity, etc.).
In which industrial sectors is Denoxification used?
– Power plants: Power plants, particularly those using fossil fuels, are major NOx emitters. The integration of DeNOx systems, such as SCR or SNCR, helps to reduce pollutant emissions and comply with air pollution standards.
– Chemical plants and refineries: Due to the nature of their combustion processes, these plants generate significant quantities of NOx. Denoxification solutions are essential for these plants to reduce emissions and improve surrounding air quality.
Denoxification units can be installed in waste-to-energy plants to effectively reduce NOx emissions produced by combustion. These units are placed at the end of the process, after the bag filter. This configuration optimizes the reduction of nitrogen oxides and treats the exhaust gases before they are finally discharged into the atmosphere.
Focus on DeNox by SCR: principle and benefits
The SCR Denoxification process involves injecting a reducing agent, such as ammonia or urea, into a NOx-containing gas stream in the presence of a catalyst. The catalyst facilitates chemical reactions, effectively converting NOx into nitrogen and water. Catalysts used include V₂O₅, Fe₂O₃ and TiO₂.
Process benefits
– High NOx reduction efficiency of up to 95%.
– Reliability and low ammonia leakage rate, minimizing the need for additional treatment.
Process disadvantages
– High investment and maintenance costs.
– Requires precise temperature control and regular catalyst maintenance.
– Sensitivity to certain “poisons”
Focus on DeNox by SNCR: principle and advantages
The SNCR Denoxification process involves injecting a reducing agent, such as ammonia or urea, directly into the combustion chamber at high temperatures. NOx reacts with the reducing agent to form nitrogen and water without the need for a catalyst.
Process benefits
– Low installation and operating costs.
– Simplicity of implementation without the need for catalyst.
Process disadvantages
– Efficiency limited to around 50% NOx reduction.
– Dependence on combustion conditions, requiring precise temperature control.
In short, denoxification is an essential step in reducing NOx emissions and complying with environmental regulations. Whether you choose SCR or SNCR, each method has its own advantages and disadvantages. For a solution tailored to your needs and personalized support, contact Servithen today. We’re ready to help you implement the best denoxification technology for your plant.
