91results about "Digesters" patented technology

The invention discloses a method for preparing high-quality dissolving pulp from low-grade plant fiber raw materials, and belongs to the technical field of biomass pulping. The preparation method comprises the following steps: screening a low-grade plant fiber raw material to obtain a fiber raw material of which the length is 20-30 mm, the width is 10-15 mm and the thickness is 3-5 mm; carrying out deep prehydrolysis-sulfate cooking treatment on the screened fiber raw materials to obtain unbleached sulfate pulp fibers; performing deep eutectic solvent and elemental chlorine-free bleaching treatment on the unbleached sulfate pulp fiber to obtain paper pulp fiber with low kappa number; and carrying out biological enzyme treatment on the paper pulp fibers with low kappa number to obtain the high-quality dissolving pulp. According to the method, the morphology and the structure of chemical pulp fibers are effectively regulated and controlled by designing deep eutectic solvent treatment, and deep dissolution of residual hemicelluloses and lignin is achieved; through biological enzyme treatment, the alpha-cellulose content and the Fock reaction performance are further improved, and finally the high-quality dissolving pulp is prepared.

The invention relates to the technical field of pulping production, in particular to a spherical digester device for pulping. Comprising a fixing frame, a spherical heat preservation shell is arranged in the fixing frame, a spherical cooking shell is concentrically fixed in the heat preservation shell, rotating shafts are fixed to the two ends of the cooking shell, the rotating shafts penetrate through the heat preservation shell and are rotationally connected with the fixing frame, and a driving unit for driving the rotating shafts to rotate is arranged on the fixing frame. The cooking shell and the heat preservation shell are driven by the motor to rotate integrally, and a multi-dimensional mixed flow field is formed under the action of centrifugal force and gravity in combination with the baffle structures uniformly distributed on the inner circumference. The wood chips and the alkali liquor are repeatedly cut and dispersed by the baffles in the rolling process, the static accumulation and layering phenomena are broken, uniform permeation of fibers and the reaction liquor is achieved, and the cooking reaction time is greatly shortened.

The utility model relates to the technical field of refined cotton, in particular to a refined cotton cooking device with a tail gas absorption mechanism, which comprises a base and a cooking pot, the cooking pot is arranged at the upper end of the base, a support frame is arranged on one side of the base, an adjusting mechanism is arranged at the bottom end of the cooking pot, a movable component is arranged in the adjusting mechanism, and the tail gas absorption mechanism is arranged on the movable component. An adjusting assembly is arranged at the bottom end of the cooking pot, a fixing plate is arranged in the adjusting assembly, a servo motor is arranged on one side of the fixing plate, a threaded rod is rotationally installed at the output end of the servo motor through a coupler, a limiting sleeve is arranged on the fixing plate, a sliding sleeve is arranged on the threaded rod, a movable support is arranged on the sliding sleeve, and a movable support is arranged on the movable support. A movable support is arranged on the base, a supporting rod is arranged on the movable support, a hinge is arranged at one end of the supporting rod, a treatment mechanism is arranged on one side of the base, a treatment tank is arranged in the treatment mechanism, an air inlet is formed in one side of the treatment tank, and filter cotton is arranged in the treatment tank.

A blow valve 15 and a biomass processing system 1 comprising such a blow valve Said blow valve 15 being connectable in a blow line 7 which is connecting two differently pressurized vessels 3, 5 of the biomass processing system 1. Said blow valve 15 is configured for controlling the flow of biomass material and fluid in the blow line 7, wherein said blow valve 15 comprises a shutter valve 31 with a central opening 33 of controllable size, said shutter valve 31 comprising a number of valve plates 35 which are disposed in an annular pattern surrounding the central opening 33 of the shutter valve 31 and wherein said valve plates 35 are movable in relation to each other whereby the size of the central opening 33 is controlled by moving the valve plates 35.

The invention provides bamboo reed bleached fluff pulp as well as a preparation method and application thereof, and belongs to the field of papermaking. According to the characteristics of low bonding strength and small bursting strength of the arundo donax short fibers and parenchyma cells, the use of chemicals such as a debonding agent and the like is canceled, the preparation process is different from a traditional bamboo fluff pulp preparation process, the components of the arundo donax short fibers are reserved, the three-dimensional structure of the arundo donax bleached fluff pulp fibers is optimized, the water absorption and water retention capacity of the fluff pulp is improved, and meanwhile, the paper pulp yield is optimized. According to the raw material characteristics of the bamboo reed, the process conditions of prehydrolysis, cooking and bleaching are optimized, and an economical and efficient bleached fluff pulp product of the bamboo reed pulp is produced, so that the method has good practical application value.

The invention relates to the technical field of high polymer material production, and discloses a digesting and mincing device for waste paperboard recycling, which comprises a supporting foot stool, the top end of the supporting foot stool is connected with a protective shell, a stirring cylinder is rotatably arranged in the protective shell, a crushing cylinder is rotatably arranged in the stirring cylinder, and a crushing device is arranged in the crushing cylinder. A double-layer filter screen is arranged on the surface of the stirring barrel, and a first sealing bearing is connected between one side of the double-layer filter screen and the protective shell. According to the invention, rotation of the stirring cylinder, rotation of the crushing cylinder and action time sequence of each component are respectively controlled, so that the waste paperboard processing requirements of different batches and different states can be flexibly adapted, accurate control of digestion time, stirring strength, crushing strength and cleaning process is realized, and adaptability and controllability of the process are enhanced.

This invention provides a biomass pretreatment method using a steam-coupling twin-screw extruder, along with cellulose-containing biomass and its applications. The biomass pretreatment method includes the following steps: sequentially subjecting pre-softened biomass raw materials to steam treatment and twin-screw extrusion crushing to obtain biomass particles; the biomass particles are then subjected to a cooking reaction to obtain cellulose-containing biomass. This invention utilizes the synergistic effect of steaming and twin-screw extrusion crushing to overcome the mass transfer resistance of dense wood with low energy consumption, aiming to solve the problems of dense forest biomass structure, high energy consumption in traditional pretreatment methods, and difficulty in chemical penetration. This process can effectively reduce the amount of chemicals used to achieve efficient and directional separation of components, fully adapting to the needs of low-cost, continuous industrial production.

The application discloses a preparation method of light fireproof sound-absorbing fiberboard and relates to the technical field of fiberboard materials.The method comprises the following steps: washing, cooking, hot grinding, adding black dye, adding a fire retardant, adding azodicarbonamide as an additive, spraying, hot pressing, and sawing.The temperature of the spraying is controlled within 100-110 DEG C, and the spraying amount is controlled within 30-50 kg / h.The fiberboard prepared by the method has a single-layer structure, has good sound-absorbing effect, does not need to be matched with sound-absorbing materials, can be thinnest to 9 mm, reaches the national fireproof B1-B level standard, and can reduce the density of the board to 600-700 kg / m 3 , so as to achieve the purpose of lightening.

This application relates to a continuous pulping method for high wet strength waste paper and a horizontal tube continuous digester. The method involves continuously feeding shredded high wet strength waste paper into a horizontal tube continuous digester with an aspect ratio of 8:1, where it is mixed with water and PAE crosslinking breaking agent to form pulp. Steam is directly introduced into the reactor for heating, and a central rotating shaft with a shearing plate is driven to rotate at a low speed of 5-15 r / min, applying continuous and gentle mechanical agitation and shearing to the pulp. The pulp is then continuously processed and discharged. This application achieves an effective synergy between high temperature, chemical degradation, and mechanical shearing, breaking through the inefficiency bottleneck of traditional intermittent hydraulic pulping. It not only achieves continuous and efficient production but also effectively improves fiber dissociation rate and significantly reduces unit energy consumption and loss of pulp physical strength.

The present invention relates to a system for treating delignified cellulose pulp, comprising: consecutive first and second washing devices configured to receive and wash delignified cellulose pulp; an acidic bleaching device arranged to receive cellulose pulp from the second washing device; the post-acid-bleaching washing device is connected to the acid bleaching device and is used for washing the cellulose pulp received from the acid bleaching device; an alkaline bleaching device arranged downstream of the washing device; the alkaline bleaching post-washing device is connected to the alkaline bleaching device and is used for washing the cellulose pulp received from the alkaline bleaching device; a filtrate feeding means arranged to recycle the waste washing liquid from the post-alkaline-bleaching washing means as a diluent between the first washing means and the second washing means and / or as a washing liquid to the first washing means; and a source of water and / or condensate connected to the second washing device to provide a washing liquid.

The invention relates to the technical field of continuous cooking, and particularly discloses a sectional type transverse pipe continuous cooking process which is characterized by comprising a multi-transverse pipe sectional continuous cooking mode of two pipes and two sections, three pipes and two sections, three pipes and three sections, four pipes and three sections, four pipes and four sections and the like. The three-section type transverse pipe continuous cooking process is characterized in that the transverse pipe continuous cooking process is divided into three sections to be carried out in a stepped mode, and specifically, the three sections are divided into three sections to be carried out in a stepped mode; according to the invention, a closed continuous treatment system is formed by fixed configuration of one to two first-section cooking pipes, one second-section cooking pipe and one third-section cooking pipe and by adopting an up-and-down serial superposition mode, and the continuous treatment system is a closed continuous treatment system, so that the energy consumption is reduced, the energy consumption is reduced, the energy consumption is reduced, the energy consumption is reduced, and the energy consumption is reduced. The interruption risk of slurry conveying is eradicated from the equipment structure level, and the continuity of the whole-stage cooking process is ensured.

The application discloses a food-grade high-strength and high-toughness paper pulp, paper products and a preparation method thereof, and belongs to the technical field of papermaking. The food-grade high-strength and high-toughness paper pulp comprises 100 parts of virgin wood pulp, 1-3 parts of alginic fiber, and 0.3-1.5 parts of a wet strength agent, and the wet strength agent is a random copolymer of methyl acrylate, glycidyl ether-based polyethylene glycol monoallyl ether, dihydro-jasmine acid methyl acryloyl oxy hydroxypropyl ester and acrylamide propyl trimethyl ammonium chloride. The alginic fiber and the wet strength agent are added into the virgin wood pulp, so that the strength and toughness of the paper products are improved.

A system and method are provided for predictive control of brown stock treatment at a pulp mill. Various online sensors generate output signals representative of actual values for respective process characteristics, each of which are directly or indirectly affected by adjustments to corresponding process variables. A controller uses the output signals or associated measurement data to dynamically set target values for the process characteristics based on a predicted impact of control responses for corresponding process variables. The controller further generates control signals to actuators associated with the respective process variables based on detected variations between the respective actual values and target values. Exemplary brown stock washing control systems may optimize various types of brown stock washing configurations, including for example vacuum drum washers, compaction baffle washers, chemiwashers, direct displacement washers and wash presses. Cloud-based analytics and machine learning may also be implemented to improve the control algorithms over time.

The invention relates to a plant (100) for pulp preparation and supply of pulp of production quality (160) to at least one fiber forming plant (200), wherein the plant is built in scalable modular form, as well as a fiber forming plant (200) with such a plant (100) and a method (300) for building such a plant (100) and a method (400) for extending such a plant (100).The system (100) comprises at least one supply module (110) and one or more process modules (120), wherein the supply module (110) and the process modules (120) are equipped with a multitude of coordinated interfaces (150) to connect the supply and process modules (110, 120) to each other, to ensure the infrastructure supply of the process modules (120), and to receive the pulp or its components and starting materials via at least one input (130) and transport it between the process modules (120), and to offer the pulp with production quality (160) via an output (140) for use by at least one fiber forming system (200).

The invention provides water-resistant bobbin base paper and a process thereof, and the bobbin base paper comprises the following components in parts by weight: 80-120 parts of a natural wood fiber raw material, 3-9 parts of chitosan, 4-12 parts of a waterproof emulsion, 3-9 parts of a treating agent, 2-6 parts of a defoaming agent, 1-3 parts of a sterilizing agent and 2-4 parts of a cross-linking agent, the natural wood fiber raw material is one or a mixture of more of commercial paper pulp, waste paper and straw agricultural wastes; the commercial paper pulp is one or more mixed pulp of bleached softwood pulp, bleached hardwood pulp, dissolving pulp or unbleached paper pulp, the preparation process is simple, the prepared bobbin body paper has the advantages of high strength, water resistance and easiness in printing, meanwhile, the bobbin body paper also has excellent waterproof performance, and the service life of a bobbin paper product is prolonged.

The utility model relates to the technical field of papermaking, in particular to a pulping device for papermaking, which comprises a shell. The heating mechanism is mounted in the bottom of the shell; the first lifting mechanism is mounted on the surface of the shell; the second lifting mechanism is mounted on the surface of the shell; the placing mechanism is arranged at one end of the first lifting mechanism; the crushing mechanism is arranged at the top of the second lifting mechanism; according to the pulping device for papermaking, by arranging the second lifting mechanism and the smashing mechanism, wood in the shell can be smashed conveniently, the heating area of the wood can be increased, lignin can be separated from the wood rapidly, and the working efficiency of the device is improved; by arranging the first lifting mechanism and the placing mechanism, wood can be conveniently filtered, the percent of pass of the wood is increased, then the placing frame is lifted out of the shell through the first lifting mechanism, groove holes in the surface of the placing frame are conveniently cleaned, and the practicability of the device is improved.

The systems and methods disclosed herein automatically provide real-time dosing corrections for industrial processes in which enzyme formulations are applied to natural fibers for pulp / paper production. An initial enzyme formulation (e.g., associated enzyme and supporting formulation components) and respective dosing rates are selected and applied based on expected fiber surface substrate characterization, expected fiber quality characterization, physical conditions of the treated system, and the respective properties of the initially selected enzyme formulation components. Upon application of the initial enzyme formulation, online sensors provide real-time feedback data corresponding to actual measurements of fiber surface substrate characterization and fiber quality characterization. Based on the feedback data, supplemental enzyme formulations (enzymes and supporting formulation components) and respective dosing rates are dynamically selected. The enzyme dosing stage can be optimized substantially in real time in response to product changes and / or variations in fiber source / formulation and / or physical conditions.

The invention provides a paper pulp cooking control method and device, electronic equipment, a storage medium and a product. The method comprises the steps that paper pulp cooking parameters collected by a sampling device are obtained; based on the pulp cooking parameters, calculating the active alkali dosage in the cooking vertical pot and the liquid ratio parameter of the vertical pot, and based on the preset corresponding relation between the cooking temperature and the cooking relative reaction rate, the cooking time and the cooking temperature corresponding to the cooking time, calculating a cooking H factor; determining a cooking kappa number based on the active alkali dosage, the standing pot liquid ratio parameter and the cooking H factor; and according to the cooking kappa number, adjusting the alkali consumption for cooking the paper pulp. According to the scheme, the cooking kappa number is directly calculated according to the calculated active alkali dosage, the vertical boiler liquid ratio parameter and the cooking H factor, sampling to a laboratory for analysis and detection is not needed, the calculation efficiency of the kappa number is improved, paper pulp cooking can be controlled in time according to the cooking kappa number, the accuracy of paper pulp cooking is improved, and the production cost is reduced. And the paper pulp quality can be improved.

The invention relates to a process for producing a wood fibre material, comprising the steps of: heating wood chips (18) in a pre-cooker (16) by means of water or steam (26), then cooking the wood chips (18) by means of steam (26) in a cooker (14), then fibrising the wood chips (18) in a refiner (32) such that fibre material (34) is produced, wherein some of the steam branches off after fibrising and is used to heat the wood chips (18) in the pre-cooker (16), and also comprising the step of introducing an oxidisation agent (56) into the branched-off steam (26) such that volatile organic substances contained in the steam (26) are oxidised and purified steam (68) is produced, wherein the purified steam (68) is at least partially used to heat the wood chips (18).

This invention relates to a method for unclogging or cleaning screens in a continuous kraft paper digester process, wherein the continuous kraft paper digester includes a plurality of screens, each screen having a side facing the digester zone and a side facing the digester wall, the plurality of screens being arranged in a screen ring, the screen ring having at least one screen outlet exiting the digester and at least one screen inlet entering the screen ring; the at least one screen inlet entering the screen ring provides cleaning fluid to the screens for: unclogging, alkalization, or both without stopping the system.

The utility model relates to the technical field of high-polymerization-degree refined cotton production, in particular to high-polymerization-degree refined cotton cooking treatment equipment which comprises a tank body, the bottom of the tank body is open, a bottom plate is arranged at the bottom of the tank body, a containing groove is formed along the edge of the top of the bottom plate, and the bottom of the tank body corresponds to the containing groove. A plurality of lifting mechanisms arranged at intervals are arranged along the outer side of the tank body, the lifting mechanisms are fixed to the outer wall of the tank body through supports, supporting foot stools are installed at the bottoms of the lifting mechanisms, supporting columns are further installed at the tops of the supporting foot stools, and the supporting columns are fixed to the bottom plate. When the high-polymerization-degree refined cotton cooking treatment equipment is used, the tank body is lifted above the bottom plate through the lifting mechanism, so that the tank body can be separated from the bottom plate and ascends, and the high-polymerization-degree refined cotton on the hanging mechanism is exposed; in this way, a worker can directly stand on the ground to take the tool to directly take down the high-polymerization-degree refined cotton, and convenience is provided for material taking.

The application provides a bamboo filament continuous cooking method, which comprises a bamboo filament pretreatment step and a continuous cooking step. In the bamboo filament pretreatment step, the bamboo filament is treated with hot water containing NaOH and alkali such as guanidine hydrochloride for 1-2 hours. The continuous cooking step is carried out by using a horizontal tube continuous digester. Through in-depth study of the chemical and physical changes in the cooking process, the application uses suitable cooking parameters and treatment methods to ensure that the pretreatment process reduces the damage to the papermaking required holocellulose while dissolving the lipid substances and lignin; and improves the silicon retention effect of CaO in the cooking process, so that a small amount of CaO can be used to effectively retain silicon in the cooking process, thereby reducing the difficulty of black liquor treatment and the reactor fouling rate.

The present invention relates to an apparatus (1) for use in cellulose hydrolysis. The apparatus (1) comprises a channel (10) for guiding a stream of cellulose-containing waste in a flow direction (FD); one or more cylinder(s) (20) arranged to rotate around an axis (A), such that, when rotated, one or more side surfaces (21) of said cylinder(s) (20) exhibit a linear velocity vector orthogonal to said axis (A); and one or more complementary surfaces that face said side surfaces (21), such that, when the cylinder(s) (20) are rotated, the side surfaces (21) and complementary surfaces cooperate in grinding the waste. The present invention further proposes a respective method for cellulose hydrolysis.

The application discloses a method for preparing electronic-grade insulating pulp from bamboo, and relates to the technical field of insulating pulp production and preparation, and comprises the following preparation steps: step A, collecting bamboo raw materials in Hunan area; step B, flaking operation, bamboo is flaked and cut into pieces in a bamboo processing factory; step C, water washing operation, bamboo pieces are washed to balance water content; step D, cooking operation, bamboo pieces are cooked by adopting sulfite process, and the yield of the crude pulp is controlled to be 40-50%; step E, screening operation; step F, beating operation; step G, sheeting operation and strength detection. The method for preparing electronic-grade insulating pulp from bamboo has certain regionalism by adopting locally planted bamboo in Hunan, the prepared electronic-grade insulating pulp reaches the superior standard, and the prepared electronic-grade insulating pulp has the quality index that the conductivity is less than 3 us / cm by adopting deionized water for washing in the whole process.

The present invention relates to an apparatus (1) for use in cellulose hydrolysis. The apparatus (1) comprises a channel (10) for guiding a stream of cellulose-containing waste in a flow direction (FD). The apparatus (1) further comprises one two or more shaft(s) (20) arranged to rotate around respective longitudinal axes (A), such that, when rotated, one or more side surfaces (71) of said shaft(s) (20) exhibit a linear velocity vector orthogonal to the axis (A). The two or more shafts (20) include one or more protrusions (70) that radially extend away from the axis (A). The present invention further proposes a method for cellulose hydrolysis.