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      • NITROGEN OXIDE REDUCTION WITH SCRUBBER TECHNOLOGY FOR RECOVERY BOILERS AND LIME KILNS

        Naveen Chenna,Ilari Vuorinen,Joonas Arola,Mikko Raiko,Juhani Viiala 한국펄프·종이공학회 2018 한국펄프·종이공학회 학술발표논문집 Vol.2018 No.10

        Nitrogen oxides (NOx) are formed during the combustion process and if they are untreated and released to the environment, they pose strong effect on environmental chemical imbalance producing several pollutants. NOx from combustion are composed of 90-95 % of nitric oxide (NO) and 5-10 % nitrogen dioxide(NO₂). NO is not dissolvable in liquid, however NO₂ and higher nitrogen oxides are highly dissolvable in liquid. There are several methods available to reduce the NOx during and post combustion. Methods like Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) are widely used in power boilers to convert the NOx to nitrogen gas, however these technologies are under studies for recovery boilers and lime kilns. As the pulp mill NOx limits are becoming strict, there is an urge to develop the technologies that are easy to use in existing or new flue gas cleaning systems. Wet scrubbers are in use for several decades and they efficiently clean the dust, sulphur dioxide and other components from flue gases. These wet scrubbers can also be equipped with oxidizing stage. The main idea is to oxidize NO to NO₂ by feeding powerful oxidants like ozone, chlorine dioxide or hydrogen peroxide to flue gas stream. Oxidized product NO₂ is absorbed into scrubber circulation solution with water and alkali. Valmet Technologies have been developing flue gas deNOx technologies for several decades and has recently supplied few deNOx scrubbers. In this paper, we discuss the possible primary and secondary methods for NOx control in pulp mill applications and operational data from Valmet’s deNOx scrubber installed after a recovery boiler.

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