Nitrogen oxides (NOx) include both nitrogen monoxide and nitrogen dioxide (NO and NO₂). These two compounds are known for their harmful effects on human health and the environment. In response to increasingly stringent regulations, many industries must incorporate effective NOx reduction systems into their emissions.
NOx emission treatment is a set of processes aimed at reducing or eliminating nitrogen oxides. This is done before industrial gases are released into the atmosphere. The most common technologies are Selective Catalytic Reduction (SCR), Selective Non-Catalytic Reduction (SNCR) or a hybrid system. All systems are based on the transformation of NOx into harmless compounds such as N2 or H2O. Such transformation is achieved by the addition of chemical reagents such as urea or ammonia solution.
Selective Non-Catalytic Reduction (SNCR): This consists of the injection of a direct reducing agent into the combustion gases at temperatures between 850 and 1050ºC. This achieves an 80% reduction in NOx emissions. It is a great advantage in cases where the space available for the installation of the catalytic converter is limited.
Selective Catalytic Reduction (SCR): The injection of the reducing agent is carried out at 350°C prior to a catalyst. This optimises the reagent consumption and increases the reduction efficiency by up to 95%.
SNCR/SCR Hybrid System: By combining SNCR and SCR, a significant reduction in NOx emissions is obtained with a balance in CAPEX and OPEX costs.
Efficiency: Both SCR and SNCR systems achieve high NOx removal rates and can comply with the most stringent environmental regulations.
Compatibility: These systems are compatible with other gas treatment technologies, such as desulphurisation by dry sorbent injection or the use of activated carbon.
Sustainability: NOx treatment by SCR and SCNR minimizes the generation of by-products and secondary waste, being clean and sustainable technologies.
Technical support: We offer advanced solutions for NOx treatment. These are designed to integrate with SCR and SNCR systems in an efficient manner, thus ensuring effective and safe NOx removal.
Customization: Each treatment is customized to meet specific industry requirements, focusing on the efficiency, sustainability and reliability of each solution.
Energy recovery from waste: The composition of waste varies greatly. Consequently, the industry that incinerates solid waste to generate energy is subject to stricter regulations regarding NOx emissions.
Steel: The raw materials used in the sintering line contain nitrogen compounds, which generate NOx when subjected to high temperatures.
Coal industry: The production of materials such as coke, graphite, carbon fibre or carbon black requires heating these raw materials without oxygen. The effluent gases generated are subsequently oxidised generating NOx and others.
Cement: The use of alternative fuels as an energy source in this industry is very common. This generates NOx peaks that require mitigation.
Refineries: Crude oil refineries generate waste effluent gases containing NOx among other compounds.
Glass: NOx emissions are generated during the production of flat glass, container glass and special glass and require treatment.
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