Method and apparatus for mixing gaseous chemical to fiber suspension

Apparatus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• a mixer casing having first and second ends, at least one suspension inlet conduit and at least one suspension outlet conduit;
• a rotor mounted for rotation in said casing, and a shaft connected to said rotor;
• means for driving said rotor shaft;
• means for introducing gas into the casing so that the gas is at least 10% by volume of the medium consistency fiber suspension to mix with the fiber suspension to form a mixture of gas and fiber suspension;
• an intense mixing zone in said casing comprising at least one throttling element for throttling the flow of fiber suspension through said casing;
• and
• means for maintaining the fiber suspension in a fluidized state from said gas introducing means up to said suspension outlet, including maintaining said fluidized state between said intense mixing zone and said suspension outlet.

Apparatus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• an elongated mixer casing having first and second ends and a circumferential wall, at least one suspension inlet conduit and at least one suspension outlet conduit;
• an elongated rotor mounted for rotation in said casing about an axis of rotation extending through a radial center of said rotor, and a shaft connected to said rotor at said radial center;
• means for driving said rotor shaft;
• means for introducing gas into said casing radially offset from radial center to mix with the medium consistency fiber suspension to form a mixture of gas and fiber suspension;
• an intense mixing zone in said casing comprising means for both throttling the flow of suspension through the casing from the inlet to the outlet and homogenizing the mixture of gas and fiber suspension in the casing;
• and
• means for maintaining the fiber suspension in a fluidized state from said gas introducing means to said suspension outlet.

Apparaus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• an elongated mixer casing having first and second ends and a circumferential wall, at least one suspension inlet conduit and at least one suspension outlet conduit;
• an elongated rotor mounted for rotation in said casing, and a shaft connected to said rotor;
• means for driving said rotor shaft;
• means for introducing gas into said casing at a position where the fiber suspension is in a fluidized state due to the action of said rotor to mix with the medium consistency fiber suspenison to form a mixture of gas and fiber suspension;
• an intense mixing zone in said casing comprising means for both throttling the flow of suspension through the casing from the inlet to the outlet and homogenizing the mixture of gas and fiber suspension in the casing;
• and
• means for maintaining the fiber suspension in a fluidized state from said gas introducing means up to said suspension outlet.

Apparatus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• an elongated mixer casing having first and second ends, at least one suspension inlet conduit and at least one suspension oulet conduit;
• an elongated rotor mounted for rotation in said casing, and a shaft connected to said rotor;
• means for driving said rotor shaft;
• means for introducing gas into the casing to mix with the medium consistency fiber suspension to form a mixture of gas and fiber suspension;
• an intense mixing zone in said casing comprising means for both throttling the flow of suspension through the casing from the inlet to the outlet and homogenizing the mixture of gas and fiber suspension in the casing;
• and
• means for maintaining the fiber suspension in a fluidized state from said gas introducing means up to said suspension outlet, including at least one rotor blade between said intense mixing zone and said suspension outlet.

Apparatus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• an elongated mixer casing having first and second ends, at least one suspension inlet conduit, and at least one suspesion outlet conduit;
• an elongated rotor having a radially central surface mounted for rotation in said casing, and a shaft connected to said rotor;
• means for driving said rotor shaft;
• means for introducing gas into the casing to mix with the fiber suspension to form a mixture of gas and fiber suspension;
• means for maintaining the fiber suspension in a fluidizied state from said gas introducing means up to said suspension outlet, said means including at least one blade attached to the rotor and radially spaced from said central rotor surface;
• and
• an intense mixing zone in said casing comprising means for both throttling the flow of suspension through the casing from the inlet to the outlet and homogenizing the mixture of gas and fiber suspension in the casing.

Apparatus for mixing large volumes of gas into a medium consistency fiber suspension, comprising:

• an elongated substantially cylindrical mixer casing having first and second ends and a circumferential wall, at least one suspension inlet conduit, and a suspension outlet conduit, disposed in said circumferential wall of said casing and extending radially outwardly therefrom;
• an elongated rotor mounted for rotation in said casing, and a shaft connected to said rotor;
• means for driving said rotor shaft;
• means for introducing gas into the casing to mix with the fiber suspension to form a mixture of gas and fiber suspension;
• means for maintaining the fiber suspension in a fluidized state from said gas introducing means up to said oulet;
• and
• an intense mixing zone in said casing comprising means for both throttling the flow of suspension through the casing from the inlet to the outlet and homogenizing the mixture of gas and fiber suspension in the casing.