17 results about "Pulp mill" patented technology

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

A method for processing a bark press water from sawmills and / or pulp mills is disclosed. According to the disclosure, the method comprisesa) filtration of the bark press water to provide a bark press water filtrate having a particle size of less than 100 μm, and b) concentrating the bark press water filtrate to a level of at least 10% dry weight and thereby providing a first fraction of concentrated bark press water, comprising tannic compounds; and a second fraction of purified bark press water.

A method for recovering cellulose from a cellulose containing textile raw material containing dyed textiles, the method comprising subjecting a disintegrated textile raw material to an oxidative pretreatment before alkaline cooking and any further processing of the cellulose pulp obtained after the alkaline cooking. After cooking, spent alkaline cooking solution containing dye and dye residues is withdrawn from the textile derived cellulose pulp and is transferred to a recovery boiler in a Kraft pulp mill. An apparatus for carrying out the method is also disclosed.

The utility model relates to paper production field, specifically say a kind of rotation shaft sealing kit based on paper pulp refiner, including the dynamic ring rotating with rotation shaft and the static ring being set on refiner shell, the dynamic ring is provided with sealing ring between static ring, the dynamic ring is also provided with sealing compensation module between static ring;The rotation shaft sealing kit based on paper pulp refiner of the utility model, by setting sealing ring between dynamic ring and static ring, and cooperate sealing compensation module, even in long time operation or wear, still can keep good seal, effectively prevent leakage, reduce the material loss caused by leakage, improve production efficiency, while also reduce the risk of environmental pollution, and adopt detachable design, so that daily inspection and replacement are more convenient and fast, reduce maintenance cost.

The utility model relates to the technical field of pulping machines, in particular to a peeled soybean soaking pulping machine which comprises a pulping box body, a material control box is installed on the top of the pulping box body, a soybean soaking tank is installed on the top of the material control box, a drawing box is installed in the material control box, and a fixed fan plate is installed in the drawing box. A rotating clamping block is installed in the center of the top of the fixed sector plate, a movable sector plate is installed at the top of the fixed sector plate, the rotating clamping block is located in the center of the movable sector plate, and a disassembling assembly is installed on the side wall of the drawing box; the peeled soybean soaking pulping machine has the beneficial effects that the material control box, the drawing box and the dismounting assembly are used in cooperation, the flow of soybeans or water is convenient to adjust and control, the situation that the grinding effect is affected due to excessive soaking of the soybeans in the water is avoided, and meanwhile, the drawing box is convenient to dismount through the dismounting assembly to be cleaned or maintained and replaced.

This invention discloses a method for preparing sodium lignin sulfonate-based porous carbon and its application, belonging to the field of efficient resource utilization of biomass and water treatment technology. The method selects sodium lignin sulfonate waste from pulp mills as a carbon source, and processes it to obtain sodium lignin sulfonate powder; the sodium lignin sulfonate powder is then blended with SiO2 and / or HCO2K and activated to obtain sodium lignin sulfonate-based porous carbon; this carbon is then applied to the removal of antibiotics from water. This invention fully utilizes the waste sodium lignin sulfonate from pulp mills, realizing the recycling of waste, increasing the added value of waste, and the preparation process is simple, pollution-free, environmentally friendly, and in line with green chemistry principles.

The utility model provides a novel ore pulping machine, which relates to the technical field of ore processing, and comprises a shell and a processing mechanism arranged on the outer side of the end part of the shell, the processing mechanism comprises a cover body, the cover body is rotatably connected to the outer side of one end of the shell, one side of the cover body is communicated and connected with a feeding hopper, and the other side of the cover body is communicated and connected with the feeding hopper. A first barrel is rotationally connected to the inner side of the shell, a first bevel gear is fixedly connected to the outer side of one end of the first barrel, a third bevel gear and a connecting shaft are driven to rotate by starting a motor, then a second bevel gear is driven, and the first bevel gear and the third bevel gear rotate relatively; and finally, the second barrel body and the first barrel body on the outer side of the end part of the connecting shaft are driven to rotate relatively, the contact frequency and time of the materials and the pulping component are increased through the relative rotation movement mode, the materials are continuously turned and ground in the relative rotation space, and the required pulping degree can be achieved more quickly.

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

The invention relates to the technical field of slurry plant odor treatment, in particular to an uninterrupted operation odor treatment system and method.The uninterrupted operation odor treatment system comprises a power supply subsystem, and the power supply subsystem comprises at least one power grid power supply line, an emergency power supply device, a standby generator set and a centralized power supply bus; electric equipment in the odor treatment system is connected to the centralized power supply bus, and the power grid power supply line and the standby generator set are electrically connected with the centralized power supply bus through the emergency power supply device; when the power grid power supply line is in a normal power supply state, the emergency power supply device is in a floating charge state, and the standby generator set is in a standby state; when the power supply lines of the power grid all fail, the emergency power supply device supplies power to the electric equipment and the standby generator set; and under the power supply state of the standby generator set, the emergency power supply device is switched to a floating charge state. Through the uninterrupted power supply, water supply and gas / steam supply system, the uninterrupted operation of the system under the conditions of public facility system faults such as sudden power failure, water failure and gas / steam failure is ensured.

The application discloses a kind of step-by-step flocculation and precipitation devices for pulp mill wastewater treatment, and specifically relates to the technical field of papermaking wastewater treatment.The application comprises a sedimentation tank one and a sedimentation tank two, and a support frame is installed on the rear sidewall of both.The top wall of the support frame is vertically fixed with a gas cylinder, and a dosing mechanism for feeding flocculants is arranged below the gas cylinder.The application controls the contraction of the gas cylinder to synchronize the opening of the output parts of the solid tank and the liquid tank, which not only completes the feeding of liquid flocculants to preliminarily flocculate the wastewater, but also synchronously completes the advance dissolution of solid flocculants to improve the efficiency of wastewater flocculation and precipitation.Meanwhile, the cleaning of the filter screen of the submersible pump is completed synchronously during the conveying of wastewater to ensure the continuous conveying of wastewater and further improve the efficiency of wastewater flocculation and precipitation.

Systems and methods are provided for predictive control of brown stock handling at a pulp mill. Various online sensors produce output signals representative of actual values of respective process characteristics, each of which is directly or indirectly affected by adjustments to a corresponding process variable. A controller uses the output signals or related measurement data to dynamically set target values for the process characteristics based on predicted effects of control responses to the corresponding process variables. The controller further produces control signals to actuators associated with the corresponding process variables based on detected differences between the respective actual values and the target values. Exemplary brown stock washing control systems can optimize various types of brown stock washing configurations, including, for example, vacuum drum washers, compaction baffle washers, chemical washers, direct displacement washers, and wash presses. Cloud-based analysis and machine learning can also be implemented to improve control algorithms over time.

This invention discloses a cellulose cotton pulp for thermal insulation aerogel and its preparation method, belonging to the field of cellulose technology. The preparation method includes the following steps: Step 1, preparing a sodium hydroxide solution, adding cotton linters to the sodium hydroxide solution for ultrasonic-assisted preimpregnation to obtain a preimpregnated pulp; Step 2, transferring the preimpregnated pulp to a digester, preparing a composite cooking aid, adding the composite cooking aid to the digester, mixing well, and then cooking; Step 3, after cooking, releasing the gas, pulping using a pulping mill, followed by bleaching and washing; Step 4, adding a modifier to the washed pulp, stirring and reacting at 30-60℃ for 1-2 hours, and obtaining cellulose cotton pulp after the reaction. The modifier includes phytic acid-modified hydrotalcite and xylitol, with a mass ratio of 1:1-2. In preparing cellulose cotton pulp, this invention uses ultrasonic preimpregnation, a composite cooking aid to assist alkaline cooking, and modifier treatment to improve the mechanical strength of the cellulose.

The present application relates to a kind of paper pulp mill wood chip drying preparation method and system, specifically, at the head of dryer, buffer bin and supporting components are installed, so that the material to be dried can quickly and smoothly enter the drying cylinder, and the smooth material flow also makes the drying air flow circulate smoothly in the dryer, and by matching the corresponding industrial control parameters, the wood chip drying standard is realized once, the cost is reduced, the efficiency is increased, energy saving and emission reduction are realized.

The invention relates to new solutions for effective recovery of chemicals in a Kraft pulp mill A method for recovering chemicals in a Kraft pulp mill is provided. The method comprises producing green liquor in a recovery boiler, conveying green liquor from the recovery boiler to a green liquor stripper, stripping the green liquor with a gas stream comprising or consisting of CO2 so as to produce a stripper off-gas, feeding the stripper off-gas to a sulfuric acid plant, and producing sulfuric acid from the stripper off-gas. Further, a system as well as use of the same for recovering chemicals in a Kraft pulp mill are provided.

The utility model relates to the technical field of pulp mill, concretely is double disc pulp mill. Including material cylinder, crushing mechanism and the blanking tube, the bottom of material cylinder is provided with support, the crushing mechanism includes the bottom disc that rotates the installation in the inside of material cylinder, is located the polishing disc above bottom disc and is installed in material cylinder for driving polishing disc and bottom disc first power component that each other reverse rotation, polishing disc is double cone structure, and the upper end of bottom disc is in accord with the bottom of polishing disc, the circumferential side of bottom disc is installed with sealing ring, the outer surface of polishing disc, the inner surface of bottom disc and the inside wall upper portion of material cylinder all are installed with a plurality of grinding teeth, and the blanking tube communicates with the inside recessed chamber of bottom disc. The utility model discloses through increasing polishing area and improving the relative speed of polishing disc and bottom disc to improve the pulping efficiency of equipment.

The present application relates to the technical field of a pulp mill, in particular to a pulp mill for paper pulp manufacturing, which comprises a machine base, a shaft power assembly and an outer shell, the outer shell can be split, the outer shell and the shaft power assembly are installed on the upper side of the machine base, one end of the shaft power assembly is installed in the inner side of the outer shell, the shaft power assembly can be power rotated relative to the outer shell and the machine base, two stator disc assemblies are installed in the inner side of the outer shell, the stator disc assemblies are coaxially arranged with the shaft power assembly, and a rotating disc assembly is arranged between the two stator disc assemblies. The pulp after being ground can pass through a second mixing treatment mechanism, the second mixing treatment mechanism can again mix and treat the material entering the stator disc assembly and the rotating disc assembly for grinding, so that the paper pulp is prevented from being separated again due to the grinding resistance, the paper pulp after secondary mixing is again subjected to grinding treatment, the mixing degree of the pulp is ensured, and the subsequent pulp is stably flowed between the stator disc assembly and the rotating disc assembly after being pumped.

The present application provides a kind of pulping wastewater advanced treatment process, which comprises: S100, the pulping wastewater is transported to pretreatment device for pretreatment, and the first-stage treatment water is obtained;S200, the first-stage treatment water is transported to biochemical treatment device for biochemical degradation treatment, and the secondary treatment water is obtained;S300, the secondary treatment water is transported to flocculation device and is treated by flocculation reaction, and the third-stage treatment water is obtained;S400, the third-stage treatment water is transported to fenton reaction device and is treated by fenton reaction, and the discharge standard is reached after treatment.The process can effectively reduce fenton treatment load and reagent usage while achieving pulping wastewater advanced treatment, greatly reducing reagent cost and sludge treatment cost.