INDUSTRY|wood industry|wood industry
- córas ionsúcháin fliuch Tagairt Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- multistage double inlet downstream scrubber | wet absorption system
- en
- Sainmhíniú system consisting of a downward pass-through double-flow bisulphite stage equipped with circulating pumps, followed by a second upwards pass-through bisulphite stage, followed by two in-series connected upward pass-through (mono)sulphite stages Tagairt "COM-Terminology Coordination, based on:Joint Research Centre. Best Available Techniques (BAT) Reference Document for the Production of Pulp, Paper and Board. July 2013, http://eippcb.jrc.ec.europa.eu/reference/BREF/PP_BREF_FD_07_2013.pdf [16.11.2015]"
- Nóta The injected Mg(OH)2 solution is absorbed by the flue-gas and removed by a downstream droplet catcher from which it is recirculated. The two (mono)sulphite stages are connected in series and are operated at a pH of 6.9 and pH 7. They transform SO2 and Mg(OH)2 into nearly unsoluble magnesium monosulphite (MgSO3). Each venturi washer has an internal circulation of the Mg(OH)2 solution. The crystal (MgSO3) is transferred to the second bisulphite stage and from there to the first bisulphite stage where it is extensively transformed into Mg(HSO3)2, the unclarified raw acid. During 'normal operating conditions' the absorber stages are operated in series. To remove the built up incrustations from the absorbers, the are regularly cleaned in an 'acid mode'. When one of the monosulphite stages is cleaned, during this 'cleaning mode' the recovery rate for SO2 is temporarily reduced – the emissions of SO2 can reach 650 mg SO2/Nm3. Normally the cleaning cycle lasts around 12 hours for the first and 18 hours for the second monosulphite stage and is carried out once or twice a month.
- laveur multiétage à contre-courant
- fr
- Sainmhíniú laveur à trois niveaux au moins où le SO2 est éliminé par lavage à l'aide de la solution alcaline de Mg(OH)2 dans le cas du procédé au sulfite de magnésium, et d'une solution de NH3 tout à fait nouvelle dans le cas du procédé au sulfite d'ammonium Tagairt "COM-FR, d'après la décision d'exécution établissant les conclusions sur les meilleures techniques disponibles (MTD) pour la production de pâte à papier, de papier et de carton, au titre de la directive 2010/75/UE du Parlement européen et du Conseil, CELEX:32014D0687/FR"
- Nóta Le contexte est celui de la prévention et de la réduction des émissions de SO2 et de STR lors de la fabrication de pâte chimique par le procédé au bisulfite.