DEGASSING CENTRIFUGAL APPARATUS, PROCESS FOR PUMPING AND DEGASSING A FLUID AND PROCESS FOR PRODUCING PAPER OR BOARD
The invention relates to a degassing centrifugal apparatus such as a pump and to a process for pumping and degassing a fluid. The apparatus has a rotatable hollow rotor (20) connected to a stationary fluid inlet (14) at one end and a stationary liquid outlet (16) at the opposite end and a gas exhaust (36) in the center thereof. The rotor (20) has at its inlet end a bladed shovel wheel (26) with arcuate shovels (24). The shovel wheel (26) accelerates a fluid flow in said rotor inlet end and causes the fluid to rotate at a peripherical velocity higher than the peripherical velocity of said rotor inlet end. The apparatus is especially useful for pumping and degassing backwater in the production of paper or board in a paper machine.