54results about "Spent liquor concentration" patented technology

The utility model discloses a black liquor spraying device and an alkali recovery furnace, relates to the technical field of alkali recovery equipment, and aims to solve the problems of uneven pipe temperature at a spray gun outlet and corrosion of a spray gun pipe wall caused by bubbles generated at the spray gun outlet in the prior art. The black liquor jetting device comprises a flow guide straight pipe, a jetting elbow and a hole shrinkage structure arranged in the jetting elbow, the flow guide straight pipe is provided with a first end and a second end, the jetting elbow is communicated with the first end of the flow guide straight pipe, and the hole shrinkage structure is located at the end, away from the flow guide straight pipe, in the jetting elbow and provided with a liquid jetting opening. The inner diameter of the end, away from the diversion straight pipe, of the liquid jet orifice is smaller than that of the jet elbow. The black liquor spraying device is applied to the alkali recovery furnace. The black liquor spraying device and the alkali recovery furnace provided by the utility model are used for reducing the corrosion of the pipe wall of the black liquor spraying device and prolonging the service life of the black liquor spraying device.

Provided are compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

To provide efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials.SOLUTION: The invention is related to compositions and processes concerning (i) recovery of organic acids from a cellulosic pulp derived from organic acid pretreatment of plant materials, (ii) treatment of cellulose recovered from the cellulosic pulp derived from the organic acid pretreatment of the plant materials prior to conversion to glucose, (iii) separating and cleaning lignin from a lignin suspension derived from the organic acid pretreatment of the plant materials, (iv) recovery of organic acids from an aqueous phase of the organic acid pretreatment of the plant materials, (v) recovery of residual organic acids from hemicellulose-containing fractions derived from the organic acid pretreatment of the plant materials, and (vi) an organic fertilizer produced from cellulose and hemicellulosic juice derived from the organic acid pretreatment of the plant materials.SELECTED DRAWING: None

The specification relates to a method and a system for adjusting pH of green liquor dregs. The method comprises contacting a slurry containing green liquor dregs (100, 200, 300, 400, 500) with flue gas (101, 201, 301, 401, 501). The system comprises a recovery boiler (105) configured to burn black liquor to produce smelt, a smelt dissolving tank (107) configured to dissolve the smelt to produce green liquor comprising green liquor dregs, and a green liquor clarifier / filter (103) and / or a dregs filter (104) configured to separate a slurry containing green liquor dregs (100, 200, 300, 400, 500) from the green liquor. The system further comprises a vessel (102, 202, 302, 402) configured to receive a slurry containing green liquor dregs (100, 200, 300, 400, 500) and a gas inlet (210, 310, 410, 510) configured to convey flue gas (101, 201, 301, 401, 501) to be contacted with the slurry containing green liquor dregs (100, 200, 300, 400, 500).

The invention is directed to compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

In a process for isolating lignin from an alkaline process stream, especially thickened black liquor, the alkaline process stream is introduced continuously into a lower region of at least one circulation reactor (1) having two reactor zones in a concentric arrangement, wherein a liquid level (10) of the alkaline process stream in the interior of the at least one circulation reactor (1) is chosen essentially at a level with an upper end (7) of an inner tubular reactor zone (6), wherein a CO2-containing gas is blown continuously from the bottom into the inner tubular reactor zone (6) of the at least one circulation reactor (1), wherein the CO2-containing gas is absorbed by the alkaline process stream in the inner circular reactor zone (6) and offgas is drawn off together with residual amounts of the CO2 at the top of the at least one circulation reactor (1), wherein the process is run at ambient pressure, especially 1 atm, and thickened black liquor with a reduced lignin content together with precipitated lignin present therein are drawn off optionally after settling at the base of the at least one circulation reactor (1).

The utility model discloses an evaporator slag scraping device for recycling cotton pulp black liquor, which can adapt to various evaporator sizes, is convenient to adjust cleaning strength and collects cleaned slag, and provides the following technical scheme for solving the technical problems: the evaporator slag scraping device for recycling cotton pulp black liquor comprises a slag scraping plate, a slag scraping plate and a slag scraping plate, comprising a positioning ring, a rotating shaft is coaxially and rotatably connected to the positioning ring, an extending frame perpendicular to the axis of the rotating shaft is arranged at the lower end of the rotating shaft, extending rods are transversely and slidably connected to the two ends of the extending frame respectively, the extending end of each extending rod is fixedly connected with a storage box, and an opening is formed in the side face, facing the rotating direction, of each storage box; a filter screen is arranged on the side face, opposite to the opening, of the storage box, the extending end of the storage box is fixedly connected with a scraping piece, and the outer side of the scraping piece is fixedly connected with a scraping plate.

The application discloses an acid pickling corrosion inhibitor prepared based on bamboo pulp papermaking black liquor, and a preparation method and application thereof, and relates to the technical field of acid pickling corrosion inhibitors. The method comprises the following steps: (1) adding concentrated sulfuric acid into the bamboo pulp papermaking black liquor, adjusting the pH value of the solution to 1-3, and then fully reacting, standing and settling, and separating to obtain a precipitate A and a filtrate A; the precipitate A is washed and dried to obtain lignin; (2) the filtrate A is concentrated through multi-effect vacuum reduced pressure evaporation to obtain a precipitate B; (3) the precipitate B is extracted through sewage ethanol extraction, suction filtration and washing to obtain an ethanol extraction liquid and a precipitate C; the ethanol extraction liquid is distilled through reduced pressure distillation to obtain an ethanol extraction liquid; the precipitate C is recrystallized, and after removing solid inorganic salts, the precipitate C is distilled through reduced pressure distillation to obtain a distillation liquid; the ethanol extraction liquid and the distillation liquid are mixed, and then evaporated through reduced pressure evaporation and dried to obtain the acid pickling corrosion inhibitor.

A startup burner assembly for a recovery boiler, the startup burner assembly includes a housing having a burner end and a second end distal to the burner end; a main fuel conduit disposed within the housing; and high-pressure air conduits disposed within the burner end of the housing. The high-pressure air conduits include angled air injection nozzles configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction.

The invention particularly relates to a dissolving pulp production process which comprises the following steps: washing and soaking wood chips or cotton linters, and naturally draining to obtain a pretreated raw material; adding adjusting water into the pretreated raw material, then adding sodium sulfite, mixing and stirring, heating and preserving heat, and extracting pre-hydrolysis waste liquid to obtain semi-slurry; the ratio of the absolute dry mass of the pretreated raw materials to the volume of the adjusting water is 1: (5-8); in terms of SO2, the use amount of sodium sulfite is 2%-4% of the absolute dry mass of the pretreated raw material; the heating and heat preservation temperature ranges from 150 DEG C to 160 DEG C, and the heat preservation time ranges from 90 min to 120 min; carrying out sulfate cooking on the semi-slurry to prepare coarse slurry and cooking black liquor; the coarse pulp is bleached, pulped and sieved by adopting an OD0EOPD1 section sequence, and the dissolving pulp is prepared. According to the method, the quality of the dissolving pulp is remarkably improved by adopting sodium sulfite to prehydrolyze the dissolving pulp, the high-end application requirements of cellulose acetate, Lyocell fibers and the like can be met, the vacuum pulp washing link of semi-pulp after prehydrolysis is omitted, the pulp wastage rate is reduced, the MVR evaporator utilizes secondary steam compression reuse, and the water resource utilization rate is improved.

A startup burner assembly for a recovery boiler, the startup burner assembly includes a housing having a burner end and a second end distal to the burner end; a main fuel conduit disposed within the housing; and at least one high-pressure air conduit disposed within the burner end of the housing. The high-pressure air conduit includes at least one angled air injection nozzle configured to direct high-pressure air exiting the burner end of the startup burner assembly in a rotational direction.

The utility model discloses a liquidometer mounting structure on a liquid chamber of a bamboo pulp black liquor falling-film evaporator, which comprises the bamboo pulp black liquor falling-film evaporator and the liquid chamber of the bamboo pulp black liquor falling-film evaporator at the lower part of the bamboo pulp black liquor falling-film evaporator, and a reducing liquid outlet pipe is arranged at the lower part of the liquid chamber of the bamboo pulp black liquor falling-film evaporator. A left side differential pressure type liquid level meter and a right side differential pressure type liquid level meter are respectively mounted on the left side and the right side of the liquid chamber of the bamboo pulp black liquor falling film evaporator. A left gas-phase diaphragm of the left differential pressure type liquid level meter is installed on the upper portion of the left side of the liquid chamber of the black liquor falling film evaporator, a left liquid-phase diaphragm is arranged on the left side of the lower portion of the reducing liquid outlet pipe, the left gas-phase diaphragm and the left liquid-phase diaphragm are connected to the left pressure transmitter through a left pressure guide pipe, and the right differential pressure type liquid level meter is installed corresponding to the left side. The structure can reduce the accumulation of impurities and scale blocks in the black liquor on the surface of the liquid phase membrane, prevent the liquid level meter from distortion caused by instability of the black liquor when the black liquor passes through the liquid outlet pipe, and guarantee the stable operation of a black liquor evaporation system.

The present invention relates to a process for recovering potassium sulfate from ash taken from a recovery boiler in a wood pulping operation. The ash is dissolved in water, and the resulting solution is evaporated to produce a concentrated dissolved ash solution, which is then processed in a glaserite crystallizer. The glaserite crystallizer produces glaserite crystals by contacting the ash with water or condensate cooled to a temperature of 0°C to 25°C in a chiller, or by cooling the crystallizer brine to a temperature of -10°C to 25°C. The glaserite crystals and cooling water are sent to an SOP crystallizer, where the sodium sulfate and potassium sulfate from the glaserite crystals dissolve in the cooling water, forming a solution containing both sodium sulfate and potassium sulfate. A portion of the potassium sulfate, exceeding its solubility limit, recrystallizes as SOP. The SOP is recovered by a solid-liquid separation process.

The invention is directed to compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

The utility model relates to the technical field of papermaking waste reutilization, and discloses complete equipment for recycling papermaking green mud, which comprises a rinsing bath, a thickener, a deflocculating machine, a screening machine and a receiving tank which are sequentially connected through pipelines, the rinsing bath is used for receiving and diluting the green mud, the thickener is used for washing water and separating material residues from the green mud, and the deflocculating machine is used for deflocculating the green mud. The deflocculation machine is used for grinding material residues, the screening machine is used for screening the material residues, the material receiving groove is used for storing the material residues, and the material receiving groove is connected with a papermaking workshop and used for conveying the material residues to the papermaking workshop to serve as papermaking filler; the device further comprises a concentrated water tank and a spray drying tower, the concentrated water tank is used for receiving washing water of the thickener, and the spray drying tower enables the washing water to form sodium carbonate. According to the utility model, the thickening device is used for separating washing water from material residues, the washing water is evaporated and crystallized through the spray drying tower to form a sodium carbonate product, and the material residues are ground and screened to be returned to a papermaking process as papermaking filler for recycling, so that papermaking green mud is turned into wealth.

The present disclosure provides a method for extracting lignin from a sulfate-pulping spent liquor, including the following steps: (1) subjecting the sulfate-pulping spent liquor to a settlement treatment, removing a lower material liquid, and collecting an upper material liquid as a material A; (2) treating the material A with a 100-300 mesh filter to obtain a material B; (3) adjusting a temperature of the material B to 50°C to 70°C, and filtering the material B through a 5-10 µm precision filter to obtain a material C; (4) allowing the material C to enter a ceramic membrane system for lignin extraction, and collecting a concentrate to obtain a material D, where a molecular weight cut-off of a ceramic membrane is 1,000 to 3,000, a treatment temperature of the ceramic membrane is 50°C to 70°C, and a treatment pressure is 4 bar to 9 bar; (5) adding demineralized water to the material D, and conducting a dialysis desalination treatment to obtain a material E; and (6) subjecting the material E to evaporation and drying to obtain a lignin powder F. The present disclosure adopts a ceramic membrane for lignin extraction, which greatly reduces the contamination and blockage to the membrane, prolongs a service life of the membrane, and allows the efficient extraction of lignin from a sulfate-pulping spent liquor.

The present invention relates to a process for recovering sulfate of potash from ash taken from a recovery boiler in a wood pulping operation. The ash is dissolved in water and the resulting solution is subjected to evaporation that produces a concentrated dissolved ash solution that is then subjected to treatment in the glaserite crystallizer. The glaserite crystallizer yields glaserite crystals that are contacted with water or condensate that has been chilled in a chiller to a temperature of 0°C to 25°C or by chilling the crystallizer brine to -10°C to 25°C. The glaserite crystals and chilled water are directed into an SOP crystallizer where the sodium sulfate and potassium sulfate of the glaserite crystals dissolve in the chilled water to form a solution containing both sodium sulfate and potassium sulfate. A portion of the potassium sulfate in excess of its solubility limit will re-crystallize as SOP. Through a solid-liquid separation process, the SOP is recovered.

The disclosure relates to resource recycling, and more particularly to a green and efficient method for recycling waste aramid-mica composite paper. The method includes: dissolution of aramid-mica composite paper scraps, separation of mica flakes; phase separation, filtration, recycling of organic solvent and collection of aramid fiber.

The invention relates to an energy-saving and environment-friendly intermittent pulping and cooking process which comprises the following steps: performing stepped heating type cooking on wood chips and cooking liquor to prepare slurry; after cooking is finished, reverse heat exchange is conducted on the dilute black liquor and the pulp, and hot black liquor is replaced; then, dilute black liquor is introduced again, and warm black liquor is replaced; the warm black liquor can be used as a material for preparing the cooking liquor; the hot black liquor is subjected to flash evaporation to remove 10-15% of moisture, the concentration of the hot black liquor is increased to 18-21 Be degrees, and the flash-evaporated hot black liquor firstly enters a quadruple-effect down-flow multi-effect evaporator to be concentrated to 28-30 Be degrees and then enters a sextuple-effect falling film evaporator to be concentrated to 65% or above; wherein secondary steam generated by flash evaporation is used as a first-effect heat source of the quadruple-effect down-flow multi-effect evaporator after liquid drops are removed through the steam-water separator. According to the method, flash secondary steam is combined to drive the first effect of the multi-effect evaporator, hot black liquor pretreatment concentration optimization alkali recovery and the like, so that energy gradient utilization is sufficient, comprehensive energy consumption is greatly reduced, and the win-win situation of environmental protection and resource recycling is achieved.

A boiler system is provided comprising: a furnace adapted to receive a fuel to be burned to generate hot working gases; a fuel supply structure associated with the furnace for supplying fuel to the furnace; a superheater section associated with the furnace and positioned to receive energy in the form of heat from the hot working gases; and a controller. The superheater section may comprise a platen including a tube structure with an end portion and a temperature sensor for measuring the temperature of the tube structure end portion and generating a signal indicative of the temperature of the tube structure end portion. The controller may be coupled to the temperature sensor for receiving and monitoring the signal from the sensor.

Described herein is a process for upgrading effluent treatment plants for pulp and paper production processes, where salts are removed from the effluent for water reuse and chemical recovery. The process comprises a first dialysis system for salt removal, a second treatment system for recovery or re-concentration, and optionally a post-treatment of the re-concentrate preventing liquid discharges to the environment. In the first system, a reversible electrodialysis or reversible pulsed step is carried out, separating the salts from the effluent, which are sent to the second treatment system to concentrate the salts (re-concentrate) or transform them into useful chemicals for the same process (recovery). Chemical recovery is achieved by electrodialysis with bipolar membranes or metathesis, to reduce the re-concentrate stream, which cannot be reused in the same plant. Lastly, this stream may be treated by spray drying, crystallization or evaporation.

The present invention relates to a method for recovering potassium sulfate from ash taken from a recovery boiler for wood pulping operation. Ash is dissolved in water and the resulting solution is subjected to evaporation, which produces a concentrated dissolved ash solution which is then subjected to treatment in a glaserite crystallizer. The glaserite crystallizer produces glaserite crystals which are brought into contact with water or condensate that has been cooled to a temperature of 0 DEG C to 25 DEG C in a cooler, or by cooling the crystallizer brine to-10 DEG C to 25 DEG C. The glaserite crystals and cooled water are introduced into an SOP crystallizer in which sodium sulfate and potassium sulfate of the glaserite crystals are dissolved in the cooled water to form a solution containing both sodium sulfate and potassium sulfate. A portion of the potassium sulfate that exceeds its solubility limit will be recrystallized as SOP. SOP is recovered through a solid-liquid separation process.

The disclosure provides methods and compositions for reducing the viscosity of black liquor. Also provided are methods of inhibiting deposition of scale and methods of processing black liquor. In some embodiments, the compositions include a carboxylate-containing polymer and an inorganic salt. In some embodiments, the compositions include a carboxylate-containing polymer, an inorganic salt, and a surfactant.

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 is directed to compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

The invention relates to a method for compacting a material which comprises or consists of the combustion residue obtained from the combustion of black liquor, wherein, during the compaction process, the material has a water content of at least 0.001 wt.%, preferably at least 0.01 wt.%. The invention also relates, inter alia, to a system, the material as such and to uses of the material.