Paper making and fiber liberation – Apparatus – Digester
Reexamination Certificate
2006-11-30
2011-11-08
Daniels, Matthew (Department: 1741)
Paper making and fiber liberation
Apparatus
Digester
C162S068000, C162S238000
Reexamination Certificate
active
08052843
ABSTRACT:
The vessel in which the chips are pre-treated with steam (ST) is provided with a ventilation channel at the top of the vessel for the leading away of weak gases to a weak gas system (NCG). A simple safety system has been installed with the aim of guaranteeing that these weak gases do not reach a level of concentration at which these weak gases become explosive. The safety system has a control unit (CPU) that detects a process parameter that is indicative of the fraction of moisture in the weak gases and opens dilution lines that supply air for the dilution of the weak gases in the ventilation channel. It is appropriate that the dilution take place in stages, where the dilution lines are opened in stages with successively increasing temperature of the weak gases.
REFERENCES:
patent: 5547546 (1996-08-01), Prough et al.
patent: 2005/0061464 (2005-03-01), Snekkenes
patent: 2006/0151133 (2006-07-01), Soderberg et al.
Burgess T., Collecting and burning noncondensible gases [downloaded online www.celso-foelkel.com.br], downloaded on May 20, 2011, section 4.2.
Kraft Recovery Short Course Table of Contents, Mar. 14, 2005.
Seborg et al, Process and Dynamics and Control, 2004, 2ndedition, p. 185, 198, and 216.
Almqvist Linda
Gustavsson Lennart
Snekkenes Vidar
Trolin Daniel
Calandra Anthony
Daniels Matthew
Fasth Rolf
Fasth Law Offices
Metso Paper Sweden AB
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