Patent ID: 8747619
Filing Date: 2014-06-10
Classification: C01F,D21F,D21H

Abstract:
1. An approach system of a fiber web machine comprising: a filtrate system for obtaining a filtrate F from the fiber web machine, a paper making stock preparation system for preparing paper making stock from at least the filtrate F obtained from the fiber web machine and various fiber and filler components, a flow piping system which includes several flow pipes and a pumping apparatus for carrying the paper making stock from the paper making stock preparation system to a headbox of the fiber web machine, and an injection feed system for feeding both carbon dioxide and milk of lime into a liquid flow moving in the approach system, wherein the injection feed system includes a first injection feed unit arranged in a wall of one of the flow pipes of the flow piping system for injecting an injection liquid comprised of at least either milk of lime or carbon dioxide into one of the flow pipes of the flow piping system in a substantially transverse direction relative to a flow direction of the liquid flow and at a feed velocity higher than that of the liquid flow such that the mixing of the at least either milk of lime or carbon dioxide into the liquid flow takes place independently of the flow conditions of the liquid flow.