Class / Patent application number | Description | Number of patent applications / Date published |
162233000 | Digester | 23 |
20130062031 | DIGESTER AND DIGESTION PROCESS - A digestion apparatus is provided that include a vessel, a closure, and a fluid-transporting system. The vessel has a digestion chamber therein and an opening that provides access to the digestion chamber. The closure is adapted to interface with the vessel opening to form a fluid-tight seal against a digestion pressure and temperature within the chamber. The fluid-transporting system is adapted to direct fluid out of the digestion chamber back into the digestion chamber through an inlet port. The apparatus may include improved fluid heating, sample holding, safety and/or circulation options. Also provided are digestion methods that may use the digestion apparatus. | 03-14-2013 |
162237000 | Continuous | 15 |
20080202717 | Arrangement for Feeding a Slurry of Chips and Liquid - The method and arrangement is for the feed of a chips suspension from one vessel to a subsequent digester in a continuous cooking process for the production of chemical cellulose pulp. The vessel has an inlet defined therein for the input of chips and an outlet defined therein for the output of a chips suspension. The chips suspension in the vessel has a first fluid/wood ratio established above a second fluid/wood ratio that is established at the bottom of the vessel. The second fluid/wood ratio is at least as great as, preferably greater than, the first fluid/wood ratio. After the output of the chips suspension from the vessel and before the chips suspension is placed under pressure for onwards transport to a subsequent digester, a fraction of fluid is withdrawn from the chips suspension, whereby a third fluid/wood ratio is established in the chips suspension. | 08-28-2008 |
20090288793 | METHOD AND ARRANGEMENT FOR CONTINUOUS COOKING - The continuous digester system has an inlet defined therein for the feed of a chips suspension and an outlet for the output of a cooked suspension of pulp. The suspension of chips is fed in to the inlet through a line at the beginning of the cook, where the chips suspension has a volume of starting cooking fluid that establishes a fluid/wood ratio that is greater than 3.5. A final cooking fluid is present during the cook for the major part of the cook and is withdrawn through a withdrawal strainer only during the final 15 minutes of the cook. The final cooking fluid ensures a fluid/wood ratio that is greater than 3.5 in association with the withdrawal. The withdrawn final cooking fluid during the final 15 minutes of the cook consists of spent black liquor that maintains a residual alkali level that lies under 15 g/l. | 11-26-2009 |
20100051222 | CONTINUOUS DIGESTER SYSTEM - In a continuous digester system the digester system is greatly simplified by using a single vertical atmospheric vessel, replacing the conventional chip bin, steaming vessel, chip chute, high pressure pumping or sluice feeders, impregnation vessels and top separator. Chips are simply fed to the top of the atmospheric vessel, and a chip level is established in the vessel. Treatment liquids are added to the vessel such that a total liquid volume (Z | 03-04-2010 |
20100276098 | DIGESTER SCREEN FOR A CONTINUOUS CELLULOSE PULP DIGESTER - The digester screen is for a continuous digester in which cooked cellulose pulp is produced. The digester screen has a number of screen bars arranged vertically in the continuous digester that have withdrawal slots (S) between the fixed screen bars through which withdrawal slots cooking fluid can be withdrawn from the column of pulp (P) of the digester. By having every second screen bar fixedly arranged and recessed a distance (D) relative to the neighboring screen bar an increased withdrawal capacity for the screen is obtained. | 11-04-2010 |
20110056642 | FEEDING SYSTEM COMPRISING PUMPS IN PARALLEL FOR A CONTINUOUS DIGESTER - The feed system is for a continuous digester where at least two pumps are arranged in parallel at the bottom of a pre-treatment vessel and a stirrer is provided in direct connection to inlets to pumps. The system makes it possible to provide a feed system with an improved accessibility and operational reliability, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced. | 03-10-2011 |
20110067833 | FEEDING SYSTEM COMPRISING PARALLEL PUMPS AND INDIVIDUAL FLOWS FOR A DIGESTER - The feed system is for a continuous digester where at least two pumps are arranged in parallel at the bottom of a pre-treatment vessel. Each pump has its own independent transfer line extending to the top of the digester. The system makes it possible to provide a feed system with an improved accessibility and operational reliability, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced. | 03-24-2011 |
20110073266 | FEEDING SYSTEM COMPRISING PUMPS IN PARALLEL FOR A CONTINUOUS DIGESTER - The feed system is for a continuous digester where at least two pumps are arranged in parallel in the bottom of a pre-treatment vessel and a liquid level of at least 10 meters is established. The system makes it possible to provide a feed system with an improved accessibility and more reliable operation, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced. | 03-31-2011 |
20110083822 | FEEDING SYSTEM COMPRISING PARALLEL PUMPS FOR A CONTINUOUS DIGESTER - The feed system is for a continuous digester where at least two pumps are arranged in parallel at the bottom of a pre-treatment vessel. The transfer to the top of the digester takes place without a conventional top separator. The system makes it possible to provide a feed system with an improved accessibility and operational reliability, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced. | 04-14-2011 |
20110162813 | HORIZONTAL RE-PULPING APPARATUS FOR CELLULOSE FIBRES - A pulping apparatus includes a hollow mixing cylinder selected to retain a volume of pulping fluid and cellulose fibres therein. The mixing cylinder is journaled for rotation about a central axis oriented at approximately +20° from horizontal. In a preferred construction, the mixing cylinder is divided internally into at least two discrete mixing chambers configured to facilitate outward flow of defibred pulp from an infeed end of the cylinder to and outwardly from the outlet end. The mixing chamber adjacent the inlet end is delineated by an end cover which closes the inlet end, and by a first divider positioned across the cylinder interior. The next adjacent mixing chamber is delineated longitudinally by the distal-most divider of the end mixing chamber, and by a second further downstream divider spaced longitudinally therefrom. The dividers include at least one through-opening therethrough. The through-openings regulate the flow of pulp and fluid along the mixing cylinder, while maintaining minimum cellulose/fluid levels in each mixing chamber. The through-openings may be positioned in alignment with, or in an asymmetrical arrangement relative to the cylinder axis so as to move eccentrically relative thereto as the mixing cylinder rotates. | 07-07-2011 |
20110259539 | FEEDING SYSTEM COMPRISING PARALLEL PUMPS FOR A CONTINUOUS DIGESTER - The feed system is for a continuous digester where at least two pumps are arranged in parallel at the bottom of a pre-treatment vessel. The outlets of the pumps are combined at a merging point before a common transfer line extends to the top of the digester. The system makes it possible to provide a feed system with an improved accessibility and operational reliability, and to operate the main part of the pumps at optimal efficiency even if the production capacity is reduced. | 10-27-2011 |
20120305209 | HARDWOOD ALKALINE PULPING PROCESSES AND SYSTEMS - Systems are provided for continuously producing chemical cellulose pulp from a slurry of comminuted hardwood material by subjecting the slurry of comminuted hardwood material to a first cooking stage under conditions sufficient to reduce syringyl lignin (s-lignin) content in the hardwood material as compared to guaiacyl lignin (g-lignin) content therein, and thereafter subjecting the slurry of comminuted hardwood material to a second cooking stage under conditions sufficient to reduce the g-lignin content remaining therein after the first cooking stage. | 12-06-2012 |
20130319628 | CONTINUOUS DIGESTER WITH A BOTTOM SCRAPER EQUIPPED WITH DRAINING APERTURES - The continuous digester is for producing pulp from comminuted cellulosic material. The digester has a cone diverter on a bottom scraper arranged in the bottom of the digester for assisting in out feed of pulp produced. The cone diverter of the bottom scraper has an upper inclined surface of the cone diverter with an inclination angle in the range 30±10 degrees in relation to the vertical. In order to improve washing performance in the bottom of the digester, especially for overloaded digesters, the upper inclined surface is equipped with draining apertures in fluid communication with a liquid receiving chamber inside the cone diverter. The liquid receiving chamber is connected via a drainage channel to the exterior of the vessel. | 12-05-2013 |
20140144600 | METHOD AND SYSTEM FOR THIN CHIP DIGESTER COOKING - An apparatus to pulp thin wood chips including: a chip screen receiving chips of comminuted cellulosic material, the screen assembly including a screening assembly which outputs thin chips; a chip bin and conveyor assembly receiving the thin chips output from the chip screen, the lower portion of the chip bin is flooded with white liquor; a continuous digester vessel having an chip inlet at an upper region of the vessel coupled to the chip bin and conveyor assembly, a cooking zone extending vertically from the upper region of the vessel to a wash zone which extends from the cooking zone to a bottom region of the vessel, and a pulp discharge outlet in the bottom region; a steam inlet at the upper region of the inlet, an upper region of the digester vessel at an elevated cooking temperature, and a screen assembly near the wash liquid inlet for the wash zone. | 05-29-2014 |
20150337491 | DIGESTER SHELL EXTENSION - The invention relates to an improved design of the bottom of a continuous digester reducing the torque load on conventional bottom scrapers with scraper arms arranged at an angle α in relation to the horizontal plane in the range between 5°-30°. A simple digester shell extension VE is installed below the lowermost wash screen WS, ending at a small distance D above the end of the outer end of the scraper arm. The shell extension prevents the descending pulp column from expanding below the wash screen and enables easier shaving action from the scraper, using a dilution and expansion volume established at the outer ends of the scraper arms. | 11-26-2015 |
20150345076 | CONTINUOUS METHOD FOR THE PRECIPITATION OF LIGNIN FROM BLACK LIQUOR - In a method for the continuous precipitation of lignin from black liquor black liquor is provided so as to flow as a pressurized flow in a reactor with a dwell time of less than 300 s. An acidifying agent selected from the group of carbon dioxide, acid and their combinations is led to the flow at one or more feeding sites to lower the pH of black liquor. The pH is allowed to decrease by the effect of the acidifying agent in the pressurized flow to the precipitation point of lignin, the pressure of the pressurized flow is abruptly released, and lignin particles are separated from black liquor. | 12-03-2015 |
162239000 | With recovery means | 2 |
20120012266 | LIGNOCELLULOSIC BIOMASS SACCHARIFICATION PRE-TREATMENT DEVICE - Provided a lignocellulosic biomass saccharification pre-treatment device capable of producing a pretreated material for saccharification. | 01-19-2012 |
162240000 | With incinerator or evaporator | 1 |
20110198049 | FIBERLINE SYSTEMS, PROCESSES AND METHODS - A chemical pulp mill system and method of using black liquor flashing steam from a digester system comprises generating black liquor in the digester system, sending the black liquor to an evaporator system without using any pre-evaporator system, flashing the black liquor in the evaporator system to yield steam, and using at least some of the steam for chip steaming in a chip bin and/or for supplying in-direct heat exchangers in the digester system for pre-heating white liquor and/or filtrates for use in the digester system. In other embodiments, a chemical pulp mill system and method for utilizing black liquor flashing steam from a digester system comprises generating black liquor from the digester system, flashing the black liquor in one stage to yield steam prior to leading the black liquor into an evaporation system storage tank, using the steam to steam chips and/or evaporate black liquor in the evaporation system, and preventing formation of concentrated non-condensable gases and foul condensate in the digester system by using the digester system without any condenser for the black liquor flashing steam. | 08-18-2011 |
162242000 | Combined | 1 |
20140196859 | DIGESTER WITH IMPROVED VAPOR CONTROL - A digestion apparatus is provided that include a vessel, a closure, and a fluid-transporting system. The vessel has a digestion chamber therein and an opening that provides access to the digestion chamber. The closure is adapted to interface with the vessel opening to form a fluid-tight seal against a digestion pressure and temperature within the chamber. The fluid-transporting system is adapted to direct fluid out of the digestion chamber back into the digestion chamber through an inlet port. A fluid transfer line may be interfaced with the closure, the line comprising a flexible hose and a quick-disconnect fitting, the fitting comprised of first portion associated with a self-sealing valve and a second portion that when mated downstream from the first portion allows fluid flow from the digestion chamber through the fitting. | 07-17-2014 |
162243000 | With pulp agitating or circulating means | 1 |
162244000 | Rotating digester | 1 |
20080257511 | OUTLET DEVICE FOR A PRESSURIZED VESSEL HAVING A COMBINED RADIAL BEARING AND HYDRAULIC DRIVE MOTOR - An outlet device and motor assembly for a pressured vessel is disclosed, where the assembly includes: a generally vertical drive shaft extending below and through the vessel and coupled to a rotating mechanism within the vessel; a stationary outlet housing supporting the drive shaft; a thrust bearing mounted on the outlet housing and around the drive shaft to rotationally engage the drive shaft; a hydraulic drive coupled to rotationally drive the drive shaft, and a radial bearing mounted around the drive shaft to rotationally engage the drive shaft and said radial bearing is at or below the hydraulic drive. | 10-23-2008 |
162250000 | Heating means | 2 |
20080245496 | APPARATUS AND PROCESS FOR DIGESTING CELLULOSIC MATERIAL - Provided is an apparatus for digesting cellulosic material that includes a vessel containing a digestion chamber and having an opening that provides access to the digestion chamber. A container for holding the cellulosic material is located within the digestion chamber. A closure interfaces with the vessel opening to form a seal against a predetermined digestion pressure and temperature within the chamber. A fluid-transporting system directs digestion fluids from a supply in the digestion chamber through a port and the container toward any cellulosic material therein. Digestion fluid distributed from the port through the container soaks the cellulosic material. Also provided are processes for digestion cellulosic material. | 10-09-2008 |
20110203757 | APPARATUS FOR PRETREATMENT FOR SACCHARIFICATION OF LIGNOCELLULOSE BIOMASS - To provide an apparatus for pretreatment for saccharification easily and continuously applying a treatment and capable of reusing ammonia at low cost. The apparatus has a mixing unit | 08-25-2011 |
162251000 | Strainers | 1 |
20150020989 | PROFILE BAR SCREEN FOR DIGESTER VESSELS - The improved profile bar screen is for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. The profile bar screen is designed with horizontal support arches that have expansion slots allowing the otherwise rigid structure of the support arches to flex and adapt to any unevenness of the vessel wall, thus allowing support shoulders to rest against the inside of the vessel wall. | 01-22-2015 |