Metso Automation Oy

Kajaani Elektroniikka Oy

Teuvo Peltomāki

Aleksi Pohjola

Pasi Antero Keinänen

Esa Piirainen

A method and an apparatus for determining the total peroxide content of a cellulose pulp suspension in the pulp suspension bleaching stage, wherein the bleaching chemical is peroxide. A sample is taken from the pulp suspension, which sample is measured in a measuring device ('). Before measuring, the pH of the sample is adjusted and after that the total peroxide content or the perhydroxyl content of the sample is measured, of which measurement the total peroxide content of the sample is determined.

Method for determining the total peroxide content of pulp suspension

Device for taking a filtrate sample from fibrous slush pulp through the wall (2) of a container (1) containing pulp, said device comprising a cylinder (3) mounted on the wall (2) so that it goes through the wall, with its open end (5) towards the container (1); a piston (7) placed in the cylinder space and forming a sampling duct (8) from the open cylinder end into the cylinder space behind the piston; and an actuator (9) for moving the piston into an intermediate position, in which the piston end forms a pocket (10) limited by the cylinder walls (4) and the piston end for gathering fibrous slush pulp and forming a pillow-like filter (11) in the pocket, and into a front position for removing the pillow-like filter into the container; the cylinder is provided with a drain duct (12) for draining off the sample penetrating through the filter and the sampling duct into the space behind the piston for analysis.

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Kajaani, Finland

Teuvo Peltomāki