Method and an apparatus for separating a gas from a fibre suspension

An apparatus for separating gas from a fibre suspension of high consistency, which comprises:

• (a) a housing having an upper chamber provided with an upper inlet for receiving the fibre suspension and a lower outlet for discharging said fibre suspension after separation of gas therefrom;
• (b) a lower chamber in said housing provided with an upper inlet communicating with said upper chamber for receiving said separated gas from said upper chamber and an outlet for discharging said gas from said lower chamber;
• (c) a shaft extending in said upper and lower chambers, said shaft being rotatable relative thereto;
• (d) a first rotor disposed in said upper chamber and connected to said shaft for rotation therewith, said first rotor having blades positioned to define a clearance space extending radially about the axis of rotation, said clearance space communicating with said lower chamber through said upper inlet thereof to pass into said lower chamber gas centrifugally separated from the fibre suspension by the rotation of said first rotor;
• (e) said first rotor having a plate disposed substantially transverse to the axis of said rotor and located adjacent to the upper inlet of said lower chamber, said plate of the first rotor having at least one open passage allowing said gas to pass therethrough;
• and
• (f) a second rotor disposed in said lower chamber and connected to said shaft for rotation therewith, said second rotor having blades effective to remove from said lower chamber through the outlet thereof such fibre as may enter said lower chamber.

An apparatus for separating a gas from a fibre suspension of high consistency, which comprises:

• (a) a housing having a first chamber provided with an inlet for receiving the fibre suspension and an outlet for discharging said fibre suspension after separation of gas therefrom;
• (b) a second chamber in said housing provided with an inlet communicating with said first chamber for receiving said separated gas from said first chamber and an outlet for discharging said gas from said second chamber;
• (c) a shaft extending in said first and second chambers, said shaft being rotatable relative thereto;
• (d) a first rotor disposed in said first chamber and connected to said shaft for rotation therewith, said first rotor having blades positioned to define a clearance space extending radially about the axis of rotation, said clearance space communicating with said second chamber through said inlet thereof to pass into said second chamber gas centrifugally separated from the fibre suspension by the rotation of said first rotor;
• (e) said first rotor having a plate disposed substantially transverse to the axis of said rotor and located adjacent to the inlet of said second chamber, said plate of the first rotor having at least one open passage allowing said gas to pass therethrough;
• and
• (f) a second rotor disposed in said second chamber and connected to said shaft for rotation therewith, said second rotor having blades effective to remove from said second chamber through the outlet thereof such fibre as may enter said second chamber.