METHOD OF REDUCING NITROGEN OXIDE EMISSIONS IN A CHEMICAL PULP MILL

The present invention relates to recovery of ammonia from ammonia-containing material flows in a chemical pulp mill for decreasing nitrogen oxide emissions of the mill. When practicing this method, the ammonia-containing material flow originating from steam stripping of condensates is adjusted by me...

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Main Authors HENRIK ENEBERG, RISTO HONKANEN, HEIKKI JAAKKOLA, KARI SAVIHARJU, SAKARI LAMMENTAUSTA, AKE SCHOENBERG, ESKO MATTELMAEKI
Format Patent
LanguageEnglish
Portuguese
Published 27.08.2007
Subjects
APPARATUS THEREFOR
PAPER-MAKING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
SEPARATION
TEXTILES
TRANSPORTING
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Summary:The present invention relates to recovery of ammonia from ammonia-containing material flows in a chemical pulp mill for decreasing nitrogen oxide emissions of the mill. When practicing this method, the ammonia-containing material flow originating from steam stripping of condensates is adjusted by means of alkali to a value of over 10 and is made into contact with steam for separating ammonia from the material flow. The recovered ammonia is used as a chemical in a combustion device in the chemical pulp mill in a way known per se to reduce detrimental nitrogen oxide emissions of the mill.
Bibliography:Application Number: PT20030396102T