Feeding comminuted fibrous material using high pressure...

Details Feeding comminuted fibrous material using high pressure... Feeding comminuted fibrous material using high pressure...

2005-01-11

2005-01-11

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Apparatus

Digester

C162S233000, C162S243000, C162S246000, C162S018000, C162S052000, C162S068000, C162S063000

Reexamination Certificate

active

06841042

ABSTRACT:
A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in the prior art. Instead of a high pressure transfer device the steamed and slurried chips are pressurized using a single vane slurry pump in series with a centrifugal slurry pump both of which are located at least thirty feet below the top of the treatment vessel and for pressurizing the slurry to a pressure of at least about 10 bar gauge.

REFERENCES:
patent: 1808830 (1931-06-01), Bond
patent: 4143999 (1979-03-01), Ryall
patent: 4421597 (1983-12-01), Armstrong et al.
patent: 5476572 (1995-12-01), Prough
patent: 5753075 (1998-05-01), Stromberg et al.
patent: 6106668 (2000-08-01), Stromberg et al.
patent: 6325890 (2001-12-01), Prough et al.

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