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JP4488788B2 |
A method for converting a vapor phase continuous digester to a hydraulic digester including the steps of: operating the vapor phase digester in a vapor phase mode wherein a chip slurry enters the vessel of the digester through a lower ch...
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JP4362445B2 |
The digester and method are for the continuous cooking of pulp. At least two withdrawal positions ( 11 E, 11 D) for cooking fluid are arranged at different heights in the digester ( 10 ). The cooking fluid in the first and second positio...
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JP4330074B2 |
A method for feeding a cellulosic fibrous material to a high pressure processing vessel including: pressurizing a low pressure flow of the fibrous material in a high pressure transfer device; discharging a high pressure flow of the fibro...
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JP4317691B2 |
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester,...
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JP2009179927A |
To provide a system for determining chip pressure in a vessel containing a slurry of lignocellulosic material.The system is for determining chip pressure, in a vessel containing a slurry of a lignocellulosic material. A pressure sensing ...
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JP4298059B2 |
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JP4292082B2 |
The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregna...
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JP4292148B2 |
Chips which have not been based in steam are continuously added to and removed from an impregnation vessel (30) containing impregnation liquid zones (Z1-Z3) with different temperatures. The flow of impregnation liquid (BL1) in the upper ...
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JP4283981B2 |
Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such ...
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JP2009024322A |
To provide a method for heating a chip impregnation layer of a continuous digesting apparatus.An impregnation vessel 10 includes a vessel container including an upper inlet for receiving a cellulosic material, a lower discharge port for ...
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JP4190121B2 |
A screen assembly particularly adapted to be used in a continuous or batch digester in the production of cellulose (chemical) pulp utilizes a particular screen plate construction that enhances productivity while minimizing blockage of th...
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JP4182806B2 |
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JP4170780B2 |
A method for adding cooking liquor into a vapor phase continuous digester for producing chemical cellulose pulp from cellulose chips including: introducing a slurry of the cellulose chips from a feed system to an inverted top separator i...
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JP4146108B2 |
A chip feeding system for a continuous digester provides for a greater rate of delivery of chip slurry to the digester, and is much less expensive than conventional chip feeding systems, typically being only 40-50% of the height of the c...
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JP4108329B2 |
A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said...
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JP4058347B2 |
The invention relates to a method for supplying washing liquid to a digester ( 1 ) for cellulose pulp and a subsequent diffuser washing device ( 2 a, 2 b). A high, disturbance-free production capacity can be obtained by using a common fe...
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JP4017761B2 |
In a vertical digester for producing chemical pulp, or other vessel for treating a slurry of comminuted fibrous cellulosic material, the cost of manufacturing the shell is significantly reduced by eliminating the external step increases ...
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JP2007530896A |
An improved system for transferring heat, utilizing diols, specifically 1,3-propanediol (PDO). The system reduces the energy consumption, maintenance costs, corrosion, toxicity, and the risk of fire associated with such heat-dependent pr...
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JP3991096B2 |
System for feeding a suspension, preferably a suspension of chips in a liquid carrier, to a pressurized vessel in a cellulose pulp mill, which system comprises at least one pump (25, 26) between a low-pressure part and the pressurized ve...
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JP2007516362A |
This is a device and a method for withdrawing cellulose pulp with a pulp concentration of 8-14% from a cylindrical storage tower. The storage tower has a plane bottom and with a diameter that exceeds 3 meters. A pipe is arranged through ...
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JP3921242B2 |
PCT No. PCT/FI97/00233 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Apr. 15, 1997 PCT Pub. No. WO97/39181 PCT Pub. Date Oct. 23, 1997Pulp is effectively and simply fed into a pulp tower using at least one feed pip...
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JP3898160B2 |
To provide a unit including a cellulose pulp continuous digester and making the best use of a vapor phase digester with a gas-filled zone on the liquid level while having the advantages inherent in a full-liquid type digester. The unit w...
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JP2007070773A |
To provide a digestion kettle enhanced in a treatment throughput by increasing amounts of extraction and circulation of a digestion liquid.The digestion kettle comprises a tank, a digestion screen, an extraction screen and a cleaning scr...
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JP2006527800A |
A new method for making pulp out of agricultural residue includes harvesting certain portion of plant stalk. The harvested plant stalk is bailed, transported and stored. At the mill, the plant stalk is chopped and goes through pulping pr...
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JP3839850B2 |
Pumping of medium consistency cellulose pulp is effected from stand pipes or like small sized pulp vessels to which pulp is normally discharged from storage towers, treatment towers, washers, filters, presses, thickeners, or the like, pa...
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JP2006517620A |
An arrangement for and a method of treating pulp, and a method of modernizing a pulp tower are disclosed. The arrangement and method relate to treating pulp in connection with high-consistency pulp towers, and especially to means (36, 42...
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JP3782824B2 |
The present invention relates to a digester and a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1)...
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JP2005336668A |
To provide a method for digesting lignocellulose material, capable of improving a digestion yield of the material, when the lignocellulose material is digested by using a one-vessel digestion apparatus having a penetration zone and diges...
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JP3723573B2 |
PCT No. PCT/SE94/01135 Sec. 371 Date Nov. 6, 1995 Sec. 102(e) Date Nov. 6, 1995 PCT Filed Nov. 28, 1994 PCT Pub. No. WO95/23257 PCT Pub. Date Aug. 31, 1995The present invention relates to a process for continuous cooking of chemical pulp...
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JP2005256224A |
To provide a method for stably keeping Kappa number of blow pulp within the predetermined target value range in a columnar vessel type continuous digester.The columnar vessel type continuous digester is supplied with a cooking agent and ...
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JP3691845B2 |
An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel with a rotatable sh...
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JP3687977B2 |
A rapid method is provided for the on-line determination of sodium sulfide concentration and/or percent sulfidity in green liquors or smelt solutions used for the production of either kraft or sulfite pulp. The method eliminates manual s...
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JP2005511910A |
A system for treating pulp comprises a dewatering device ( 2 ) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel ( 16 ) for shredding the dewatered pulp, and an outlet pipe ( 22 ) from the p...
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JP2005089921A |
To provide a method for producing pulp using a liquid phase continuous digester in which occurrence of tip hanging can be prevented as much as possible in the liquid phase continuous digester for producing kraft pulp.In a liquid phase co...
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JP3623469B2 |
To provide a method for the continuous pressure control of a vertical- type boiler for chopped cellulosic fibrous materials, capable of maintaining the pressure inside the boiler at a desired level, and/or maintaining the liquid level in...
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JP2005042243A |
To provide a digester for paper manufacturing whose material consists of a titanium-clad stainless steel to increase its corrosionproofness to the utmost.The digester 10 comprises a substantially cylindrical digester body 12 with the mat...
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JP3620599B2 |
PCT No. PCT/SE94/00300 Sec. 371 Date Oct. 5, 1995 Sec. 102(e) Date Oct. 5, 1995 PCT Filed Apr. 5, 1994 PCT Pub. No. WO94/24363 PCT Pub. Date Oct. 27, 1994The present invention relates to a scraper device, preferably a bottom scraper arra...
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JP3615767B2 |
PCT No. PCT/BR97/00007 Sec. 371 Date Nov. 10, 1997 Sec. 102(e) Date Nov. 10, 1997 PCT Filed Mar. 5, 1997 PCT Pub. No. WO97/33035 PCT Pub. Date Sep. 12, 1997The present invention relates to a continuous process for acid hydrolysis of lign...
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JP2004535278A |
A method to remove scale build-up in a vessel having at least one screen is described and involves placing a cover inside the vessel such that it is located beneath at least one screen to separate the screen from the rest of the vessel. ...
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JP3592313B2 |
By using a construction in which a suspended beam structure (9) is suspended from a suspension support base (8) that has been installed inside a tower structure (1), in a manner that enables movement up and down of the suspended beam str...
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JP2004300603A |
To provide a method for pulp continuous production, with which a continuous digester is improved, operation conditions are bettered and yield and qualities of pulp are improved.The conventional continuous digester is equipped with an inf...
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JP3576562B2 |
Steam (preferably clean steam) having less noncondensible gases than steam produced by conventional black liquor flashing is produced from hot black liquor from a digester of a pulp mill. A heat exchanger is utilized and the hot black li...
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JP3560162B2 |
Low temperature steaming and slurrying of wood chips results in significant improvement in treatment, the chips being maintained at a temperature below 110 DEG C. (more desirably at about 105 DEG C. or less, and most desirably at about 1...
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JP2004232184A |
To provide a feeder for comminuted cellulose fibrous material simplifying the apparatus, capable of dramatically reducing required numbers of the apparatus elements.The system for producing chemical cellulose pulp from comminuted fibrous...
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JP3549150B2 |
A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substanti...
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JP3524558B2 |
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 hig...
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JP3496872B2 |
To provide a method for supplying a finely crushed fibrous material to the top part of a treating vessel, aiming for the improvement of its simplicity, operation and maintenance by conducting a pressurized transportation by using a slurr...
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JP3484382B2 |
To provide a method for improving yield in kraft pulp manufacturing from a cellulose comprising broadleaf tree chips, and further to provide an apparatus therefor. The yield can be improved by at least 1-2% especially when a broadleaf tr...
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JP3461311B2 |
To provide a method utilizing the outstanding feature of a vapor phase digester having a zone filled with gas on the liquid level while having merit of a flooded-digesting can in a continuous digesting can for cellulose pulp and their ap...
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JP3461270B2 |
To provide a process for ground cellulose fibrous material and an assembly for the same. The steaming process is carried out by supplying the material to a vertical type tip pin having an one-dimensional reducing part and a side relief b...
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