288 results about "Spray dryer" patented technology

The invention discloses a preparation method of an efficient lithium oxalate lithium supplement agent, and relates to the field of preparation of lithium ion battery positive electrode lithium supplement agents, and the preparation method comprises the following steps: S1, adding CNTs into an organic solvent for ultrasonic cleaning, then cleaning the CNTs with pure water, and finally drying; s2, concentrated sulfuric acid and concentrated nitric acid are prepared into a mixed acid solution, CNTs are added, and ultrasonic reflux is carried out; then cleaning the CNTs until the washing water is neutral, and finally drying to obtain oxidized CNTs; s3, the oxidized CNTs and (NH4) 2MoS4 are dissolved in water, then the precursor solution is atomized into micron-sized liquid drops, the micron-sized liquid drops are cracked in an inert atmosphere, and a three-dimensional composite material MoSx-CNTs is prepared; and S4, dissolving the three-dimensional composite material MoSx-CNTs and lithium oxalate in an ethanol solution, and drying in an inert atmosphere in a high-pressure spray dryer to obtain the lithium oxalate-coated MoSx-CNTs composite material. According to the invention, low-voltage and efficient decomposition of lithium oxalate is realized by regulating and controlling metal nodes and pore structures of MOFs, and meanwhile, the damage of residues to the microstructure of the battery is avoided.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium nickel cobalt aluminate / carbon composite positive electrode material with a core-shell structure and a spray drying process thereof, the lithium nickel cobalt aluminate / carbon composite positive electrode material comprises the following raw materials: a lithium source, an iron source, a phosphorus source, a carbon source and a solvent; the method specifically comprises the following steps: S1, dissolving a lithium source, an iron source, a phosphorus source and a carbon source in a solvent, mixing according to a stoichiometric ratio, adjusting the pH value by using ammonia water or citric acid, and adding a binder to adjust the viscosity to obtain a precursor solution; s2, atomizing the precursor solution into tiny liquid drops by a centrifugal or pressure type spray dryer through a nozzle or a centrifugal disc, and staying the liquid drops in a tower for 4-10 seconds to obtain a dried microsphere precursor; s3, presintering the dried microsphere precursor in an inert atmosphere at 300-400 DEG C through a firing device, and removing volatile components; and S4, cooling the pre-sintered and dried microsphere precursor, and calcining in the firing device again to form crystals.

A method for preparing sodium vanadium fluorophosphate as a positive electrode material for sodium-ion batteries on the basis of spray drying, which method aims to solve the problems of poor electronic conductivity and fluorine loss in sodium vanadium fluorophosphate as a positive electrode material for sodium-ion batteries. The method comprises dissolving a carbon source, a phosphorus source, a sodium source and a vanadium source in water, and then drying same in a spray dryer to obtain a precursor powder; and then uniformly mixing the precursor powder with a fluorine source, and calcining the resulting mixture for 3-6 h to obtain sodium vanadium fluorophosphate, namely, a positive electrode material for sodium ion batteries. The material is made of micron spherical particles having a core-shell structure, the particle size is about 8 μm, the shell thickness is about 200 nm, the initial specific discharge capacity is 110.60 mAh / g at a rate of 1 C, and the specific discharge capacities are 97.90 mAh / g and 74.70 mAh / g at rates of 10 C and 30 C, respectively. The present invention can be used in the field of sodium-ion batteries.

The invention relates to the technical field of cereal milk tea preparation, in particular to sea-buckthorn cereal milk tea and a preparation method thereof.The method comprises the steps that sodium caseinate is stirred and dissolved in deionized water and then subjected to water bath to obtain a sodium caseinate solution, and soy isoflavone is fused into the cooled sodium caseinate solution to obtain a film forming solution; performing vacuum spray drying on the hippophae rhamnoides fruit solution through a vacuum spray dryer to obtain hippophae rhamnoides fruit powder particles, and mixing the film-formed fried rice, the hippophae rhamnoides fruit powder particles and ingredients to obtain the hippophae rhamnoides fruit grain milk tea, determining whether the preparation stability of the hippophae rhamnoides fruit grain milk tea meets the requirement or not based on the maximum difference quantity of the thickness of the film layer on the surface of the film-formed fried rice; determining whether the immersion depth of the stirring blades needs to be increased or not; determining whether the inclination angle of the drum needs to be reduced; and determining the number of cyclic shearing times based on the volume average particle size of the sea buckthorn fruit powder particles. The preparation stability of the hippophae rhamnoides fruit grain milk tea is improved.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

The invention discloses a rapidly synthesized ferric sodium pyrophosphate electrode material, a preparation method thereof and a positive electrode. Relates to the technical field of batteries. The preparation method comprises the following steps: S1, mixing a sodium source, an iron source, a phosphorus source and a carbon source, adding a preset volume of deionized water, and stirring until the raw materials are completely dissolved to obtain a light yellow transparent solution; s2, adding a preset amount of modified carbon nanotubes into the light yellow transparent solution, and dispersing in an ultrasonic environment to obtain a stable suspension; s3, starting a spray dryer, and collecting yellow green spherical precursor powder from a discharge port; s4, placing the yellow green spherical precursor powder obtained by spray drying in a magnetic boat, and carrying out heat preservation at 300 DEG C in a pure argon environment at a heating rate of 2 DEG C / min for 5 h to obtain black powder; and S5, transferring the black powder into Joule thermal equipment, and reacting for a preset time under a preset condition to obtain a final black powdery product. Through innovative process design and material modification, the core problems of long period, poor conductivity, low tap density and the like in the traditional preparation technology are solved.

The present invention relates to a low-temperature spray drying device, belonging to the technical field of spray dryers. The low-temperature spray drying device includes a fixing frame and a drying tank fixedly connected inside the fixing frame. A tank cover is installed on the top of the drying tank. A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame. It further includes: a wall scraping mechanism; a gas guiding mechanism; a filter screen; a crushing mechanism; a conveying mechanism. Through the arrangement of the scraper, the present invention enables the scraper to scrape off the atomized materials adhering to the inner wall of the drying tank and the granular materials adhering to the inner wall of the drying tank that are not dried, avoiding the adhesion of materials on the inner wall of the drying tank, resulting in the aggregation of materials, affecting the particle size of the produced finished product, and causing the particle size of the produced finished product to not meet the requirements. Furthermore, it ensures that the particle size of the produced granular materials meets the requirements and that the moisture content of the produced granular materials meets the production requirements.

The application belongs to the field of fine chemical industry and environmental protection, and particularly relates to a method for preparing metal triflate by using high gravity reaction. The method comprises the following steps: 1, using trifluoromethylsulfonyl chloride and anhydrous HF gas as raw materials to generate trifluoromethylsulfonyl fluoride gas; 2, performing gas-liquid contact reaction of the trifluoromethylsulfonyl fluoride gas with an alkali metal solution to obtain a mixed solution; 3, performing solid-liquid separation on the mixed solution by using a filter press, and the liquid phase is a triflate salt solution; 4, drying the triflate salt solution by using a spray dryer to obtain a solid-phase product triflate salt. The method uses trifluoromethylsulfonyl chloride and anhydrous HF as raw materials to replace triflic acid in the traditional method, and utilizes high gravity reaction, so that the production cost is greatly reduced. The process is simple, the obtained product triflate metal salt has low impurity content, is superior to the industry standard, the process is zero emission, and has good economic value and social value.

The utility model discloses a combined circulating spray dryer which comprises a drying tank, a fixed supporting frame which is used for adjusting the rotating angle of the drying tank and is convenient to disassemble and assemble is arranged outside the drying tank through a rotating shaft rod, and a servo motor set which is used for adjusting the driving angle of the drying tank is arranged outside a supporting vertical plate on one side of the fixed supporting frame. The servo motor drives the driving rotating rod to rotate, and the driving rotating rod drives the drying tank to rotate, so that the inclination angle of the drying tank can be adjusted, a combined lifting tank cover on the drying tank can follow the drying tank to move at the inclination angle, and the drying tank can be moved to an inclined horizontal state; the combined lifting tank cover is adjusted from a high position to a position suitable for disassembly, assembly and maintenance for maintenance, and the combined lifting tank cover is separated from the drying tank in a pneumatic mode, so that the drying disassembly and assembly stirring shaft can be displayed at the position suitable for disassembly, assembly and maintenance, and the drying tank is easier and more convenient to disassemble and maintain. And the disassembly and maintenance time is shortened.

The utility model discloses a plant extracting and drying device, which belongs to the technical field of drying devices and comprises a spray drying mechanism and a feeding mechanism, the spray drying mechanism comprises a drying tower and a first nozzle, the drying tower is sealed, the first nozzle is arranged at the top of the drying tower, one end of the first nozzle is provided with a feeding port, and the other end of the first nozzle is provided with a discharging port. The other end of the first nozzle is located in the drying tower, the feeding mechanism comprises a feeding pipeline, the feeding pipeline is communicated with the feeding port, and a discharging port is formed in the bottom of the drying tower; the first nozzle comprises a connecting part and a centrifugal part, the connecting part is connected with the feeding port, the centrifugal part is connected with the other end of the connecting part, and the centrifugal part is located in the drying tower; the diameter of the centrifugal part is gradually increased in the direction from the connecting part to the interior of the drying tower, the first nozzle is provided with the connecting part and the centrifugal part, and the diameter of the centrifugal part is gradually increased along the outer side, so that spray with large width and uniform distribution can be generated, and the drying efficiency is improved.

The invention belongs to the technical field of medicine, and particularly relates to an aprepitant nanocrystalline composition and a preparation method and application thereof.The aprepitant and a sucrose solution are mixed, a stabilizer is added to obtain a solution to be ground, the solution to be ground is ground through a wet grinding process, and the aprepitant nanocrystalline composition is obtained; uniformly mixing the suspension with a spray drying protective agent and a flow aid to obtain a mixed solution, and drying and curing the mixed solution by adopting a spray dryer to obtain the aprepitant nanocrystal composition in the form of a dry suspension, and directly spray-drying the suspension, uniformly mixing the suspension with a skeleton agent and an adhesive, adding water to a constant volume, carrying out vacuum degassing, and carrying out pre-freezing and freeze-drying to obtain the freeze-dried orally disintegrating tablet type aprepitant nanocrystal composition.

The utility model discloses a multifunctional spray dryer which comprises a tank body and further comprises a hot air pipe installed on the outer wall of the tank body, the two ends of the inner wall of the top of the hot air pipe are connected with flow dividing assemblies, a drainage assembly is installed on the outer wall of the hot air pipe, and a stirring assembly is rotatably installed on the drainage assembly. An exhaust assembly is mounted on the outer wall of the other side of the tank body, and a collecting box is mounted at the bottom of the tank body. Liquid mist can flow between the drainage assembly and the inner wall of the tank body after being sprayed out through the drainage assembly, the situation that fog drops in the conical interior are possibly difficult to make complete contact with hot air, and the drying effect is affected is avoided, meanwhile, when hot air is introduced into the tank body, the stirring assembly can be blown to rotate, and the drying effect is affected. Hot air flow and liquid mist can be stirred together conveniently, the hot air flow and the liquid mist make more sufficient contact, the drying effect can be further improved, air in the tank body is exhausted through the exhaust assembly, and the exhausted air flow can be filtered through a filtering structure at the bottom of the exhaust assembly.

The utility model relates to the technical field of atomizing nozzles, and discloses a multifunctional integrated spray dryer atomizing nozzle which comprises a shell, a nozzle is fixedly connected to the bottom of the shell, a filter screen is fixedly connected to the interior of the shell, and two buffering assemblies used for buffering impact force are fixedly connected to the top of the filter screen. The top of the buffering assembly is fixedly connected with a power assembly used for smashing impurities, the top of the power assembly is rotationally connected with a blade, and the interior of the power assembly is slidably connected with a sliding block. According to the utility model, water enters the shell, the sliding block in the clamping groove is made to move through the flushing force of the water, the blades are made to rotate, so that some impurities are crushed, filtered through the filter screens and sprayed out along the nozzle, the spring is arranged between the filter screens, and the flushing force of the water enables the spring to be extruded; and the punching force can be reduced, and certain buffering is achieved.

The utility model relates to the technical field of spray drying equipment, in particular to an anti-stockpiling spray dryer which comprises a spray dryer body, a discharging assembly is arranged on the lower portion of the spray dryer body, the discharging assembly comprises a receiving hopper connected with the spray dryer body, a discharging channel is arranged on the lower portion of the receiving hopper, and the discharging channel is communicated with the discharging assembly. The anti-blocking device used for assisting in discharging is arranged in the discharging channel, materials in the discharging channel can be scattered through the anti-blocking device, the phenomenon that the materials are excessively stacked is avoided, and the operation stability and the production efficiency of the device are improved.

The present invention discloses a low-cost aerosol preparation process for catalyst powder, which specifically comprises the following steps: step 1: providing a solid catalyst material with catalytic activity; step 2: placing the solid catalyst material in a pretreatment device for surface activation treatment; step 3: performing secondary surface activation treatment; step 4: placing the solid catalyst material that has undergone surface activation treatment in an aerosolization device, and converting the solid catalyst material into tiny particles with a particle size of 8 to 20 μm through the aerosolization device: low-cost catalyst powder preparation is achieved by introducing an adjustable inert gas and a soluble polymer, and adopting a combination of an ultrasonic atomizer and a rotary spray dryer; thereby reducing raw material and energy consumption and reducing production costs; efficient preparation: introducing an adjustable inert gas and a circulating gas recovery device, and adopting a combination of an ultrasonic atomizer and a rotary spray dryer can improve the preparation efficiency of the catalyst powder.

This utility model relates to the technical field of spray dryers for traditional Chinese medicine extracts, specifically a spray dryer for traditional Chinese medicine extracts, including a machine body, a cover plate, a connecting mechanism, and a cleaning mechanism. The machine body has a support base at its bottom, and several support bases are provided. The cover plate is connected to the machine body via the connecting mechanism. The connecting mechanism includes a fixing block, an annular groove, an electromagnet, and bolts. The annular groove is formed on the side wall of the cover plate. One end of the fixing block is connected to the machine body via the bolts, and the other end of the fixing block extends into the annular groove, with the portion of the fixing block extending into the annular groove matching the groove. One end of the electromagnet is connected to the top of the machine body, and the other end of the electromagnet is attracted to the side wall of the cover plate. Several connecting mechanisms are provided. The cleaning mechanism includes a through groove, a vertical block, a sliding component, a sealing block, and a scraper. This utility model of a spray dryer for traditional Chinese medicine extracts solves the problem of inconvenient cleaning of current equipment.

The embodiment of the application discloses a preparation method of a target temperature-sensitive drug-loaded composite microsphere based on attapulgite, which comprises the following steps: carrying out purification treatment on original attapulgite based on an aqueous solution of inorganic strong acid to obtain purified attapulgite; mixing the purified attapulgite, gypenoside, inulin and folic acid to obtain a mixture, and carrying out mixing treatment on the mixture based on deionized water to obtain a composite microsphere suspension; conveying the composite microsphere suspension into a spray dryer to carry out granulation to obtain primary drug-loaded composite microspheres; adopting a melt impregnation method to coat lauric acid on the surface and pores of the primary drug-loaded composite microspheres, and cooling the primary drug-loaded composite microspheres coated with lauric acid to room temperature to obtain the target temperature-sensitive drug-loaded composite microspheres. The application can not only realize temperature change-based on-off type control release of drugs, significantly improve the targeting and treatment accuracy of drugs, but also reduce the systemic toxic side effects of chemotherapy from the source, and realize efficient and low-toxicity synergistic treatment.

The invention provides a spray drying method of a semeglutide solution, which is characterized in that the semeglutide solution and drying gas are simultaneously introduced into a spray dryer, the ratio of the airflow velocity (kg / h) of the drying gas to the feeding flow velocity (kg / h) of the semeglutide solution is (120-900): 1, and the air inlet temperature of the drying gas is 40-60 DEG C. The spray drying method disclosed by the invention is high in production efficiency and short in production time, and meanwhile, the yield and the product quality can be kept unchanged.

The utility model relates to a spray dryer with a mother liquor preheating function, which aims to solve the technical problem that the mother liquor is inconvenient to preheat by the aid of hot air separated by a cyclone separator at present, and comprises a spray dryer body, and the top of the spray dryer body is communicated with a preheating box through a first guide pipe. The other end of the preheating box is communicated with a liquid inlet pipe; the tail end of the spray dryer body is communicated with a cyclone separator through a second guide pipe, the top of the cyclone separator is connected with the bottom of a preheating box through a third guide pipe, rotating joints are fixed to the two end faces of an inner cavity of the preheating box in a penetrating mode, and a plurality of evenly-distributed aluminum pipes are communicated between the two rotating joints. The mother liquor is preheated through hot air with temperature separated by the cyclone separator, so that energy is saved when the mother liquor enters the drying machine for drying, meanwhile, the mother liquor can be shunted through a plurality of aluminum pipes after entering the preheating box, the contact area between the mother liquor and the hot air is increased, and the preheating effect is improved.

The utility model relates to the field of drying machines, in particular to a centrifugal spray drying machine which comprises a drying tank, a hot air mechanism is arranged on one side of the drying tank, a feeding mechanism is arranged at the top of the drying tank, a mounting table is arranged at the bottom end in the drying tank, a discharging port is formed in the middle of the mounting table, and a rotating groove is formed in the upper end face of the mounting table. An arc-shaped heat conduction cylinder is rotationally installed in the rotating groove and attached to the inner wall of the drying tank, and a plurality of scraping plates are installed in the middle of the arc-shaped heat conduction cylinder through a supporting frame. When atomized materials are dried, the drying efficiency of the materials can be effectively improved through the additionally-arranged side air outlet, the arc-shaped heat conduction barrel is driven by the driving motor to rotate, the materials which are not dried thoroughly can be further dried through the heat conduction performance of the arc-shaped heat conduction barrel in cooperation with a scraper blade and other assemblies, and the drying efficiency of the materials is improved. And part of materials attached to the inner wall are scraped and guided to the discharging opening, the drying effect on the materials is effectively improved, and the machining quality is guaranteed.

The invention discloses a preparation method and a quality control method of a traditional Chinese medicine composition for stroke and middle meridian syndromes caused by extravasated blood blocking collaterals, and relates to the field of traditional Chinese medicines. The preparation method comprises the following steps: extracting salvia miltiorrhiza by adopting a composite enzymolysis-two-phase low-temperature extraction method, extracting erigeron breviscapus by adopting citric acid-ethanol extraction, extracting ligusticum wallichii by adopting double-template molecular imprinting-stir-frying with bran, extracting kudzu vine root by adopting a microwave method, adding auxiliary materials including hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose and beta-cyclodextrin, drying by adopting a centrifugal spray dryer, and packaging by adopting a packaging machine. The Maillard reaction is regulated and controlled. The method has the advantages of efficient extraction, component optimization, preparation stabilization, drug effect enhancement, adverse reaction rate reduction, quality controllability and the like.

The utility model discloses a microcapsule spray dryer for producing emulsified powder essence, which realizes vertical circulating stirring of raw materials in a material storage tank through the rotary motion of a spiral conveying shaft in a material guide barrel; the spiral conveying shaft pumps the raw materials located on the lower portion of the material storage tank upwards along the material guide barrel, then the raw materials flow back through the upper end of the material guide barrel, and circular flowing of the raw materials in the vertical space is achieved. Therefore, the phenomena of local deposition and layering of the raw materials in the storage tank are avoided. Especially for emulsion with large density difference between the wall material and the core material, layering phenomena such as wall material sedimentation and core material oil phase floating are effectively prevented, the uniformity and the stability of the raw materials in the storage process are remarkably improved, and then the embedding rate and the structural integrity of the microcapsule are improved.

The utility model discloses a spray dryer with a scraping mechanism, which comprises a dryer, the top of the dryer is provided with a top cover, one side of the dryer is provided with a fan, the top of the fan is communicated with a heating box, an electric heating pipe is arranged in the heating box, the top of the heating box is connected with an air pipe through a connector, and the other end of the air pipe is communicated with the dryer. A rotating shaft is rotationally connected to the center of the bottom of the top cover, scraping plates are fixed to the two ends of the rotating shaft through fixing assemblies, and when the abraded scraping plates are replaced, the two pressing blocks are pressed inwards, so that the pressing blocks move and compress springs through moving plates, and when the two pressing blocks get close to each other, the two moving plates and clamping blocks are driven to move and get close to each other; the clamping blocks are separated from the clamping grooves in the surfaces of the scrapers, and the insertion rods on the surfaces of the scrapers are pulled out of the insertion grooves in the surfaces of the stirring rods, so that the scrapers are separated from the stirring rods and are detached and replaced, the scrapers are convenient to detach, and the detaching and installing efficiency of the scrapers is greatly improved.

Provided herein is a method for preparing a batch of feed solution for spray drying from at least one solvent and two or more solid components comprising at least one excipient and at least one active pharmaceutical ingredient (API), wherein the method is performed in a system comprising a deagglomeration device and a tank that are fluidly connected to form a fluid loop, the method comprising: (i) charging the solvent into the system (ii) charging the two or more solid components into the system, wherein at least one solid component of the two or more solid components is charged into the system through the deagglomeration device, (iii) circulating the solvent and the two or more solid components around the fluid loop through the tank and the deagglomeration device while mixing with the deagglomeration device to dissolve the two or more solid components in the at least one solvent, to prepare the batch of feed solution, wherein the batch has a volume of 50 L to 500 L. Related methods for delivering a continuous supply of feed solution for a spray dryer and systems for preparing batches of feed solution for a spray dryer are also provided.

The utility model discloses a spray dryer for drying protein, which comprises a charging barrel, a spray main machine, a pulse bag-type dust collector, an induced draft fan and a silencer, a cleaning mechanism is arranged in the spray main machine, the cleaning mechanism comprises a driving plate, two groups of mounting rings and two groups of scraping plates, the outer wall of the scraping plate is in contact with the inner wall of the spraying main machine, a connecting plate is fixedly arranged between the mounting ring and the scraping plate, a gear ring is fixedly arranged on the inner wall of the mounting ring, and a gear motor is fixedly arranged at the top of the spraying main machine; by means of the designed cleaning mechanism, materials adhering to the inner wall of the spraying main machine can be cleaned while the materials are dried, the materials adhering to the inner wall are scraped and cleaned through the rotating scraping plate, regular shutdown for cleaning the materials adhering to the inner wall is not needed, and the protein powder drying processing efficiency is improved.

The invention belongs to the related technical field of drying devices, and particularly discloses a spray freeze drying tower which comprises a support, a side frame and a spray dryer, the side frame is installed on one side of the outer wall of the support, the spray dryer is arranged above the side frame, a drying tower body is arranged in the support, and the drying tower body is arranged above the side frame. A rectangular barrel is connected to the interior of the drying tower body in a penetrating mode, an end opening of the spray dryer communicates with the interior of the drying tower body through an arranged conveying assembly, side rods are arranged on the two sides of the inner wall of the rectangular barrel, and the interiors of the two side rods are jointly connected with a bag net through correspondingly-arranged sliding parts; a sliding frame is jointly installed in the two side rods in a sliding mode, a material scattering part is arranged at the position, close to the middle, in the sliding frame, and a driving part is arranged at the lower end in the sliding frame, the oyster peptide extract can be well dried, drying is sufficient in the drying process, and excessive adhesion is avoided.

The invention relates to the technical field of spray drying, in particular to a multistage phosphoric acid spray dryer. Comprising a drying tower; a cover plate is arranged at the upper end of the drying tower, hot air mechanisms are arranged on the cover plate and the drying tower, and a centrifugal spray head and a material blocking mechanism used for prolonging the falling time of phosphoric acid are rotationally installed in the drying tower. A phosphoric acid solution is atomized through the centrifugal spray head, the atomized phosphoric acid solution is dried in time, then the conical pipe is knocked through the knocking part to vibrate the conical pipe so as to promote falling of phosphoric acid powder and prevent the phosphoric acid powder from being attached, and then the crushed phosphoric acid powder is thrown out through centrifugal force to be dried again. Dehydration is enhanced while adhesion is prevented, so that the drying efficiency and quality are improved.

A spray dryer arrangement comprising a spray dryer device (1), a heat pump (14) and a dehumidifier device (24), a primary liquid circuit (20) and a secondary liquid circuit (22). The spray dryer arrangement comprises a bypass conduit (66) provided in the secondary liquid circuit for bypassing a second heat exchanger (23), and a controllable valve (34) for controlling a flow of secondary liquid into the bypass conduit (66) and to the second heat exchanger (23) respectively, a temperature sensor (35) for measuring the temperature of the secondary liquid in the secondary liquid circuit (22), and a control unit (36) configured to control the controllable valve (34) on basis of input from the temperature sensor (35), and configured to thereby regulate the temperature of the secondary liquid in the secondary circuit (22) to be within a predetermined temperature range.

A multi-stage drying integrated spray dryer relates to the technical field of material drying equipment and comprises a main body rack, and a feed atomization unit, a multi-stage drying unit, a gas-solid separation unit and a waste heat dissipation unit are arranged on the main body rack. The feeding atomization unit adopts a composite atomization mode to guarantee uniform particle sizes of materials, the multi-stage drying unit improves the drying effect through three-stage gradient drying, the gas-solid separation unit optimizes the structure to achieve efficient separation, and the waste heat dissipation unit rapidly cools and prevents moisture regain. The problems that existing equipment is uneven in atomization particle size, insufficient in drying, incomplete in gas-solid separation, prone to moisture regaining and deterioration and the like are solved, and the finished product quality and the production efficiency are improved.

The invention relates to a flame retardant for polyester fibers and a preparation method thereof, and relates to the technical field of flame retardant synthesizing.The preparation method comprises the following steps that pre-dispersion and activation are conducted, specifically, water and melamine are added into a reaction kettle, stirring is conducted to obtain a uniform suspension, and then a water-soluble polymer is added into the suspension; complex reaction: slowly heating and stirring; regulating and controlling coprecipitation and crystallization: slowly adding cyanuric acid into the reaction kettle, and then heating and stirring for reaction to obtain slurry; after the reaction is finished, cooling the slurry, adding a wetting dispersant, stirring, conveying to a centrifugal spray dryer for drying, and collecting to obtain the flame retardant. The flame retardant for the polyester fiber, prepared by the preparation method disclosed by the invention, has the advantages of relatively small particle size, excellent dispersity, efficient flame retardance, high thermal stability and excellent processability.