Apparatus and method for deaerating or degassing a paper stock suspension

An apparatus for deaerating a paper stock suspension, comprising:

• means enclosing a compartment;
• said compartment including a first chamber;
• means for establishing a negative pressure in the first chamber;
• an impact member provided for the first chamber;
• means within the compartment for forming partial jets of the paper stock suspension to be deaerated;
• said forming means directing said partial jets against the impact member in order to cause spraying of the paper stock suspension so as to separate air from the partial jets;
• said forming means comprising distributor means provided with bore means defining throughflow openings for the formation of the partial jets of the paper stock suspension to be deaerated;
• said compartment including a second chamber for infeed thereto of the paper stock suspension which is to be deaerated and located in cooperative relationship with respect to the distributor means;
• means for removing deaerated paper stock suspension from the first chamber;
• means for removing the air separated from the paper stock suspension from the first chamber;
• said bore means being arranged in the distributor means such that the paper stock suspension stream is divided into a plurality of partial jets defining small partial jets each having a volume flow of maximum 100 liters/min.;
• said bore means being provided with means for increasing turbulence of the partial jets effluxing from the bore means at an outer surface of each of said partial jets;
• cleaner means for separating deleterious particles from the paper stock suspension so as to produce good stock;
• means for delivering the good stock for deaeration to the second chamber;
• the second chamber is located beneath the distributor means;
• the good stock emerges from the cleaner means at a pressure of about 1.4 to 1.8 bars absolute;
• said delivering means delivering the good stock at said pressure into the second chamber beneath the distributor means where there prevails a pressure of about 0.5 to 0.8 bar absolute which works against a pressure of approximately 0.05 bar absolute prevailing in the first chamber;
• said first chamber being located above the distributor means;
• and
• said means for establishing a negative pressure in the first chamber establishes a pressure of approximately 0.05 bar absolute in the first chamber.

An apparatus for deaerating a paper stock suspension, comprising:

• means enclosing a compartment;
• means for establishing a negative pressure in the compartment;
• an impact member provided for the compartment;
• a distributor within the compartment for forming partial jets of the paper stock suspension to be deaerated;
• said distributor comprising means for directing said partial jets against the impact member in order to cause spraying of the paper stock suspension so as to separate air from the partial jets;
• said distributor comprising a plate provided with bore means defining throughflow openings for the formation of the partial jets of the paper stock suspension to be deaerated;
• means for infeeding of the paper stock suspension which is to be deaerated to said compartment;
• means for removing deaerated paper stock suspension from the compartment, said means for removing comprising a collecting device for receiving and removing the deaerated paper stock suspension arranged adjacent to and beneath the plate;
• means for removing the air separated from the paper stock suspension from the compartment;
• said bore means being arranged in the distributor means such that the paper stock suspension stream is divided into a plurality of partial jets defining small partial jets each having a volume flow of maximum 100 liters/min.;
• and
• said bore means being provided with means for increasing turbulence of the partial jets effluxing from the bore means at an outer surface of each of said partial jets.