APPARATUS AND METHOD IN REMOVING AIR FROM PULP STOCK

摘要

The invention relates to a deaeration tank (10) for a feed system (200) of pulp stock of a paper machine or equivalent and a method in removing air from pulp stock. Pulp stock (M) is guided to an inlet pipe (11) of the deaeration tank (10) and via it to the inner space of the deaeration tank (10) which space comprises a collecting space (V<SUB>1</SUB>) for the pulp stock (M). The pulp stock (M) is first collected so that it forms in the space (V<SUB>1</SUB>) a boundary surface (T<SUB>1</SUB>) in relation to an upper vacuum space (O<SUB>1</SUB>). To the vacuum space (O<SUB>1</SUB>) is produced underpressure. From the collecting space (V<SUB>1</SUB>) the pulp stock (M), from which air has been removed, is guided to an outlet fitting (15). After having come from the inlet pipe (11) into the deaeration tank (10), the pulp stock (M) is released to the collecting space (V<SUB>1</SUB>) of pulp stock (M) below the upper boundary surface (T<SUB>1</SUB>) of pulp stock (M), whereby a pipe/pipes (12a<SUB>l</SUB> 12a<SUB>2</SUB>...12a<SUB>n</SUB>) for the outflow of the pulp stock (M) to the space (V1) opens/open below the boundary surface (T<SUB>1</SUB>).