52 results about "Heat mass transfer" patented technology

The invention belongs to the technical field of drying equipment, and particularly relates to a double-cone vacuum dryer and a silver nitrate drying method.The double-cone vacuum dryer comprises a stock bin, a gas circuit mechanism, a heat source mechanism, a first power mechanism, a blowing adjusting mechanism and a second power mechanism; a second power mechanism drives an arc-shaped plate in a blowing adjusting mechanism to rotate back and forth relative to the transfer bin so as to adjust the direction and the flow speed of the hot nitrogen blown out of an upper opening of the transfer bin, and when the arc-shaped plate rotates clockwise, the silver nitrate wet material which is turned upwards under the action of centrifugal force is blown away; the second power mechanism is matched with the blowing adjusting mechanism to adjust the blowing-out direction and the blowing-out flow speed of hot nitrogen in a reciprocating mode, it can be guaranteed that a dry layer on the surface of the silver nitrate wet material is broken, and the problem that the silver nitrate wet material splashes after the dry layer on the surface of the silver nitrate wet material is broken can be solved; the problems that after a drying layer is formed on the surface of the silver nitrate wet material, the internal heat and mass transfer path is lengthened, and the drying efficiency and the drying time are affected are solved.

The invention discloses a soil remediation device, and relates to the field of environmental protection, the soil remediation device comprises a remediation cylinder, a supporting roller is fixedly arranged on the circumferential outer wall of the remediation cylinder, a transmission gear is mounted on one side of the supporting roller, a feeding cylinder is fixedly arranged at one end of the remediation cylinder, a connecting disc A is fixedly arranged at the other end of the remediation cylinder, and a drying pipe is inserted into the remediation cylinder in a penetrating manner; a disturbance wall scraping mechanism is fixedly arranged on the outer side wall of the drying pipe, a connecting disc B is fixedly connected to the end of the connecting disc A, a filter cylinder is fixedly connected to the end of the connecting disc B, an air spraying pipe is arranged on the disturbance wall scraping mechanism, a material turning piece is fixedly arranged at the end of the air spraying pipe, and a disturbance piece is fixedly connected to the end of the material turning piece. According to the soil remediation device, the technological process is simplified, and the investment cost is reduced; the heat and mass transfer efficiency is enhanced, the specific surface area of crushed small-particle materials is increased, high-temperature gas can make more sufficient contact with the materials, and thorough drying work is achieved after hardened soil is crushed.

The application belongs to the technical field of drying equipment, and particularly relates to a double-cone vacuum drying machine and a silver nitrate drying method. The double-cone vacuum drying machine comprises a stock bin, a gas path mechanism, a heat source mechanism, a first power mechanism, a blowing adjustment mechanism and a second power mechanism. The second power mechanism drives the arc-shaped plate in the blowing adjustment mechanism to reciprocatingly rotate relative to the transfer bin, so as to adjust the direction and flow rate of the hot nitrogen gas blown out of the upper opening of the transfer bin. When the arc-shaped plate rotates clockwise, the wet silver nitrate material that is flipped upward under the action of centrifugal force is blown away. The second power mechanism cooperates with the blowing adjustment mechanism to reciprocatingly adjust the blowing direction and blowing flow rate of the hot nitrogen gas, which can not only ensure that the dry layer on the surface of the wet silver nitrate material is broken, but also avoid the problem that the wet silver nitrate material splashes after the dry layer on the surface of the wet silver nitrate material is broken. That is, the problem that the heat and mass transfer path inside the wet silver nitrate material is lengthened after the dry layer is formed on the surface of the wet silver nitrate material, which affects the drying efficiency and drying time, is overcome.

The invention discloses a corrugated board based on a waterproof coating and a preparation method thereof, and relates to the technical field of packaging materials, the corrugated board comprises corrugated medium paper and a bionic gradient response waterproof coating coated on the surface of the corrugated medium paper; the bionic gradient response waterproof coating is composed of a waveform adaptive resin matrix, a dynamic cross-linking agent system and a reconfigurable pore filler. In order to solve the problem of cross-linking failure caused by uneven drying, asynchronous shrinkage, microcracks and unbalanced heat and mass transfer of a corrugated board due to a waveform structure, a bicontinuous gradient network is formed through a bionic gradient response waterproof coating (containing waveform adaptive resin, a dynamic cross-linking agent and reconfigurable pore filler); and in cooperation with surface energy pretreatment, electrostatic atomization coating and segmented drying processes, ridge peak / ridge valley performance balance is achieved, the drying defect and crosslinking dynamic unbalance are solved, the waterproof durability and environmental adaptability are improved, and the equipment cost is reduced by 70%-80%.

The invention discloses an opencast coal mine coal spontaneous combustion incubation period prediction method suitable for a negative temperature condition, and relates to the technical field of coal spontaneous combustion prediction. The method comprises the following steps: firstly, carrying out an oxygen adsorption dynamic experiment on a to-be-detected coal sample at a constant temperature of-20 to 100 DEG C to obtain a low-temperature oxygen adsorption rate constant and establishing a function relationship between the low-temperature oxygen adsorption rate constant and the temperature; secondly, calculating ice melting latent heat according to the ice content in the coal sample to be detected, and introducing the ice melting latent heat as a key energy loss item into the heat-mass transfer model of the coal pile; further, establishing a coal pile energy balance equation comprehensively considering oxidation heat release, ice melting latent heat consumption and a heat dissipation process; and finally, solving the equation through a numerical method, and calculating the time required by the coal pile from the initial negative temperature rise to the critical spontaneous combustion temperature so as to obtain the accurate coal spontaneous combustion latency. The method is particularly suitable for mines in cold regions, surface mines and winter coal storage yards.

The invention discloses a heat transfer calculation method for pulsating heat pipes with adjustable inclination angles and liquid filling rates. The heat transfer performance of the pulsating heat pipes with different inclination angles and liquid filling rates is researched by adopting a numerical method; calculating the heat transfer process by solving the energy equation of the steam bomb and the energy and momentum equation of the liquid bomb, so as to predict the pulsation phenomenon of the working medium in the pulsating heat pipe; on the basis of a momentum heat mass transfer model, calculating the phase change heat transfer capacity through film condensation and a down-flow film boiling heat transfer coefficient, investigating the influence of different inclination angles on the liquid film thickness and the down-flow film speed, and increasing the influence of the down-flow film on the liquid elastic length; and the liquid bomb pulsation condition of the pulsating heat pipe under different inclination angles and different liquid filling rates is researched, and then the heat transfer performance of the pulsating heat pipe is calculated. The working heat transfer performance of the pulsating heat pipes with different inclination angles and liquid filling rates and the motion state of the working medium are analyzed and calculated, and guidance is provided for parameter development and engineering application of the pulsating heat pipes.

The utility model relates to sludge drying equipment, and belongs to the technical field of environmental protection, the sludge drying equipment can realize multi-dimensional crushing of sludge blocks and remarkably improve the heat and mass transfer efficiency of materials in the drying process, and the comprehensive practicability is relatively good. The heat insulation shell is arranged outside the drying cylinder, and the heat insulation shell and the drying cylinder are fixedly welded; the driving motor is detachably mounted on the drying cylinder, and the output end of the driving motor extends into the drying cylinder through a through hole formed in the drying cylinder; the stirring lantern ring is fixedly welded to the interior of the drying cylinder, one end of the stirring shaft is rotationally connected with the stirring lantern ring, and the other end of the stirring shaft is fixedly connected with the output end of the driving motor; the multiple stirring blades are fixedly arranged outside the stirring shaft in a sleeving mode, and stirring tooth rakes are fixedly welded to the ends, away from the stirring shaft, of the stirring blades; the feeding port and the discharging port are correspondingly and fixedly installed at the two ends of the drying cylinder respectively.

The invention provides a method and device for killing spores, and belongs to the technical field of sterilization. According to the method, the spore suspension is inactivated, ultrasonic treatment and electrolysis are carried out at the same time, and the spore suspension contains sodium chloride. Ultrasonic treatment and electrolysis are carried out at the same time, ultrasonic waves can accelerate heat and mass transfer and ionization balance, generation of electrolyzed water is accelerated, meanwhile, the effective chlorine concentration of the electrolyzed water is remarkably improved, the ultrasonic waves generate physical damage to spore outer walls, inner membranes and the like, the spore outer walls are broken and fall off, and the spore inner membranes are damaged and dissolved, so that the spore concentration is improved. And the electrolyzed water can better permeate into the spores, and the electrolyzed water and the spores are synergistically treated to play a better role in inactivating the spores, so that the spores are quickly and efficiently killed, and meanwhile, the influence on the shelf life and the quality of fruits and vegetables is relatively small.

The application discloses a lithium bromide heat pump integrated composite generator-condenser and system based on a hollow fiber membrane, utilizes industrial waste heat as a high-temperature heat source, combines membrane heat mass transfer technology of the hollow fiber membrane, combines a generator and a condenser in a lithium bromide absorption heat pump, and forms an integrated composite generator-condenser structure. The industrial waste heat is used as a high-temperature heat source to heat a dilute lithium bromide solution, water vapor in the high-temperature lithium bromide solution penetrates into a water vapor layer through the hollow fiber membrane due to a steam pressure difference, and the water vapor is cooled by circulating cooling water to realize simultaneous heat and working medium transfer. The condensed water does work in an evaporator and enters an absorber to be sprayed and mixed with a concentrated lithium bromide solution, and then enters the integrated composite generator-condenser again to circulate. The composite generator-condenser discards a form that a traditional evaporator and an absorber are separated, greatly reduces a land occupation area of the equipment, simultaneously avoids medium transportation between the equipment, reduces heat loss, and improves a performance coefficient of the heat pump.

The invention relates to the technical field of fluid heat transfer, and discloses a series coupling type vortex enhanced heat transfer tube and a cracking furnace, the series coupling type vortex enhanced heat transfer tube comprises a hollow tubular tube body, and the inner wall of the tube body is provided with a rotational flow generating mechanism extending in the axial direction of the tube body; a vortex generator is arranged at the position, away from the inner wall of the pipe body, of the downstream side of the rotational flow generating mechanism, and a fluid attack angle exists between the vortex generator and the flowing direction of fluid. According to the series coupling type vortex enhanced heat transfer tube provided by the invention, a flow field structure of rigid rotational flow built-in precession type secondary vortex can be formed on the premise of not losing the rotational flow strength of fluid near the tube wall, so that the heat-mass transfer process between the fluid near the tube wall and the fluid in the central area is promoted to be orderly, stably and accurately regulated and controlled; therefore, deep matching of fluid flow-heat exchange-reaction characteristics is realized.

The invention belongs to the technical field of ship power and distributed energy, and particularly relates to a marine cogeneration system based on a compact reformer and an application method. The system comprises a combined heat and power supply module and a transcritical CO2 circulation module, the combined heat and power module converts chemical energy of gas fuel into electric energy and generates combustion tail gas. And the transcritical CO2 circulation module recovers and utilizes the waste heat of the combustion tail gas to generate power. Through deep coupling of the heat and power cogeneration module and the transcritical CO2 circulation module, the defects that in the prior art, a pre-reformer and a rear combustor are structurally separated, the system size is large, and the heat and mass transfer path is long are overcome, and the problems that in the prior art, the high-grade waste heat utilization rate is low, and the comprehensive energy efficiency of the system is not high are solved. And collaborative optimization of system miniaturization, multi-stage efficient utilization of energy and extremely low emission is realized.

The present invention provides a falling film devolatilizer comprising a vertical container, a melt pressure chamber disposed at the upper portion of the container, and a discharge chamber disposed at the bottom of the container. The melt pressure chamber is connected to the material inlet, and the discharge chamber is provided with a material outlet. A heat exchange chamber is provided between the melt pressure chamber and the discharge chamber. The devolatilizer is provided with multiple falling film tubes, the inner wall of each tube forming the contact surface for the falling film flow of the material. The tubes have an inscribed circle diameter of 50 to 300 mm, and the tubes pass through the heat exchange chamber. The lower ends of the tubes are connected to the discharge chamber. A plurality of film distribution holes are arranged circumferentially inside the upper end openings of the tubes. The inscribed circle diameter of the holes is 2 to 15 mm, and the aspect ratio (L / D) of the hole length L to the inscribed circle diameter D is 2 to 15. The film distribution holes connect the melt pressure chamber and the falling film tubes. The present invention improves the uniformity of the material film flow within the device, enhances heat and mass transfer efficiency, and provides a compact internal component structure, making it easy to scale up industrially.

The invention discloses a method and a system for optimizing a stirring flow field of a vinyl chloride polymerization reaction kettle, and relates to the technical field of vinyl chloride polymerization production optimization. Comprising the following steps: collecting physical attribute parameters of a reaction kettle structure, a stirring assembly and a medium, and inputting the parameters into a chloroethylene polymerization flow field CFD simulation platform; constructing a turbulence multiphase polymerization viscosity coupling model to associate viscosity and turbulence intensity, constructing a stirring flow field heat and mass transfer association model to describe stirring parameters and a heat and mass transfer rule, and introducing a multiphase flow interface tracking optimization algorithm to capture three-phase interface evolution; and collaboratively inputting the model and algorithm output data into a platform for multi-physics field coupling simulation, adjusting parameters for repeated simulation, and comparing flow field uniformity with heat and mass transfer efficiency data to determine optimal parameters. The system is matched with the method, and collaborative operation of parameter collection, model construction, simulation calculation and parameter optimization is achieved. The flow field simulation precision and the parameter optimization systematicness are improved, and the polymerization reaction stability and the product quality are guaranteed.

The invention relates to the technical field of drying, and discloses a metal waste residue double-layer drying device which comprises a cylindrical drying cylinder divided into an inner layer and an outer layer and a heat transfer module installed outside the drying cylinder, and the heat transfer module is arranged on one side of the material dry end of the drying cylinder and inputs heat into an inner cavity of the drying cylinder. According to the device, an efficient heat and mass transfer system is constructed through a synergistic mechanism of drying cylinder rotation-crushed material overturning and advancing-wall surface heat conduction, and the crushed materials are driven to continuously overturn and advance when the drying cylinder rotates, so that each part of the crushed materials can be in full contact with a heat conduction surface of the inner wall of the drying cylinder, and a heat transfer boundary layer between the crushed materials is beaten through dynamic overturning, so that the heat transfer efficiency of the crushed materials is improved. And meanwhile, heat source gas of the annular cavity continuously supplies energy to the heat conduction face of the inner wall, heat is efficiently conducted to the crushed aggregates which move forwards in an overturning mode through the wall face, it is ensured that the temperature of the crushed aggregates is stably higher than the evaporation temperature of liquid attached to the surface, the heat transfer efficiency can be greatly improved, and the metal waste residues can be evenly heated and dried in continuous movement.

The application relates to a high-salt wastewater crystallization method and device, and belongs to the technical field of wastewater treatment. In the method, hot flue gas or hot air is blown through the surface of fine-particle crystal seeds in a scattered state and covered with a water film, heat and mass transfer occurs between the hot flue gas or hot air and the surface of the fine-particle crystal seeds, the water on the surface of the fine-particle crystal seeds evaporates into the flue gas or air, the salt in the high-salt wastewater is crystallized on the surface of the fine-particle crystal seeds, the growing crystal seeds in a scattered state collide with each other or with the wall surface of a crystallizer in the movement, the surface crystals are stripped off, screened and discharged from the crystallizer; the flue gas or air carrying a small amount of fine-particle crystallized salt is discharged after dust removal; and the crystal seeds in a scattered state return to the crystallizer, are re-coated with a water film, evaporate and crystallize, and are recycled. The device has the advantages of strong heat and mass transfer process, large crystallization area, crystal seed strengthening in the crystallization process, and the like, can realize rapid evaporation and crystallization of wastewater by using low-temperature flue gas or air (less than 90 DEG C), and has small volume and weight, and low manufacturing and using costs.

The invention provides a single-component thruster for strengthening heat and mass transfer and a manufacturing method and application of the single-component thruster. The single-component thruster comprises an evenly-distributed injector assembly, a strengthening type catalyst bed assembly and a spray pipe which are sequentially arranged. The uniform distribution injector assembly comprises an injector, a uniform distribution net and a supporting net; the flow distribution proportion of the injection surface of the injector in the central area is not higher than 45%, and the flow distribution proportion of the injection surface of the injector in the peripheral area is not lower than 55%; the enhanced catalyst bed assembly comprises a shell as well as a sub-bed plate net, a sub-bed plate, a bed stop plate net and a bed stop plate which are sequentially mounted in the shell along the axial direction; through the special structural design of the shell, the separate bed plates and the bed stop plates, the heat and mass transfer of the catalyst bed is enhanced. The method is suitable for a single-component thruster system adopting a green and non-toxic propellant, and the performance index of a spacecraft can be greatly improved.

The application belongs to the technical field of ship power and distributed energy, and particularly relates to a marine combined heat and power system based on a compact reformer and an application method. The system comprises a combined heat and power module and a transcritical CO2 cycle module. The combined heat and power module converts the chemical energy of gaseous fuel into electric energy and generates combustion tail gas. The transcritical CO2 cycle module recovers and utilizes the waste heat of the combustion tail gas to generate power. The application overcomes the defects of the separation of the pre-reformer and the after-burner structure, the large system volume and the long heat and mass transfer path in the prior art, solves the problems of low high-grade waste heat utilization rate and low system comprehensive energy efficiency in the prior art, and realizes the collaborative optimization of system miniaturization, multi-stage efficient energy utilization and extremely low emission.

The present application relates to the technical field of fusion device, and more particularly to a heat and mass transfer experiment platform of a gas baking system of a divertor. The technical scheme comprises a gas baking system, a vacuum system, a secondary side cooling system and a data acquisition and control system. The gas baking system comprises a Roots blower, the Roots blower is connected with a regenerator, the regenerator is connected with an electric heater and a cooler respectively; the vacuum system comprises a vacuum tank and a vacuum assembly installed on the vacuum tank, and the electric heater is connected with an experimental piece inside the vacuum tank. The present application can establish a heat and mass transfer model, help to understand the heat and mass transfer law, optimize the design and operation of the device, reveal the influence mechanism of the baking temperature, the working medium pressure and the flow rate, ensure the baking safety and stability, test the influence of different gas working media on the baking characteristics, test the vacuum leakage characteristics, find and solve problems in time, and ensure the high vacuum environment, reliability and stability of the fusion device.

This invention relates to the field of design simulation technology, specifically to a method for predicting the heat and mass transfer performance of a combined wet and dry cooling tower based on numerical simulation. The method includes the following steps: collecting structural parameters, operating parameters, and physical property parameters of the combined wet and dry cooling tower, and establishing a coupled numerical equation for energy balance. This invention obtains the current number of segments, calculates the variance of the segmented heat flux density values ​​based on the structural parameters and heat transfer values; dynamically adjusts the number of segments according to the variance of the segmented heat flux density values ​​to obtain the adjusted number of segments, and calculates the outlet temperature difference; then performs numerical iterative convergence based on the outlet temperature difference. By abandoning the traditional model of a fixed number of segments and dynamically adjusting the segments based on the real-time heat flux density distribution, the calculation accuracy is improved in areas with large heat flux fluctuations, and the calculation efficiency is improved in areas with small fluctuations, thereby improving the iterative convergence speed and prediction accuracy.

The invention provides a gill-type multi-stage distillation device with a 3D evaporator on the top surface, which is characterized by comprising an evaporation assembly, a plurality of condensation plates, a gill-type evaporation-condensation assembly and a dust-free paper assembly which are sequentially arranged from top to bottom, comprising a base plate, three-dimensional evaporation units and photo-thermal absorption layers, the multiple three-dimensional evaporation units are arranged on the upper surface of the base plate and used for increasing the light receiving area and the evaporation area of the base plate, and the photo-thermal absorption layers are arranged on the upper surfaces of the three-dimensional evaporation units and the upper surface of the base plate. The photo-thermal absorption layer is used for absorbing solar energy and converting the solar energy into heat energy; the evaporator supporting plate is connected with the base plate in a clamped mode and used for enabling the evaporation assembly and the gill type evaporation-condensation assembly to form a stable heat and mass transfer environment.

The invention discloses an internal hot air flowing speed control device during rape microwave processing, which comprises a box body and a connecting annular block, a quick dismounting mechanism for quickly dismounting a mounting box is arranged on the inner side of the box body, and a middle connecting ring is arranged on one side, far away from the box body, of the connecting annular block. The process from synchronous shielding to release of all the air inlet holes is achieved by combining a linkage adjusting structure of the shielding strips and the connecting strips, when the motor drives the moving block to drive one group of shielding strips to slide, the connecting strips can synchronously drive the multiple groups of shielding strips to move, and it is ensured that the shielding areas of all the air inlet holes are consistent; therefore, hot air enters the box body through the uniformly distributed air inlet holes, the phenomenon that the hot air at the edge is high in flow speed and the hot air at the center is low in flow speed is avoided, the design enables the oilseed rape placed on the rotating frame to be in uniform contact with the hot air, moisture evaporation rates of all areas of the oilseed rape are consistent, and heat and mass transfer balance of microwave heating and hot air dehumidification is effectively maintained.

The invention discloses an ammonia water packed tower for improving heat and mass transfer performance based on an ultrasonic oscillation atomizing ring. The ammonia water packed tower comprises an upper tower body, a rectifying section, a stripping section and a lower tower body, the top of the upper tower body is provided with a steam outlet, the side surface of the upper tower body is provided with a reflux inlet, and the upper tower body is internally provided with a liquid separation tank, a rectangular gas raising cylinder and a liquid distribution bottom plate; the rectifying section comprises a filler consisting of oscillating atomization rings and a filler supporting plate; the stripping section comprises a concentrated solution inlet, a filler consisting of oscillating atomization rings and a filler supporting plate; the lower tower body comprises a dilute solution outlet in the bottom and a steam inlet in the side surface of the lower tower body. The high-frequency ultrasonic atomizer can greatly increase the gas-liquid contact area and improve the liquid distribution characteristic, and the medium-low frequency ultrasonic oscillation can enhance the internal disturbance of the solution and strengthen heat and mass transfer. According to the invention, the heat transfer and component migration efficiency can be improved in a limited space, the ammonia rectification purity and the transfer mass are improved, the system performance is improved, and the miniaturization of rectification equipment is realized.

This invention relates to the field of power cable technology, specifically to a phosphorus-nitrogen flame-retardant modified polyolefin sheathed power cable and its preparation method, comprising the following raw materials in parts by weight: 40-60 parts ethylene-vinyl acetate copolymer, 15-25 parts metallocene polyethylene, 80-140 parts composite flame retardant, 10-20 parts composite additive, 0.8-1.5 parts antioxidant, 1.5-2.5 parts lubricant, and 2-3.5 parts silicone masterbatch. In this invention, a synergistic flame-retardant system is constructed through the first and second additives of the composite additive. The first additive forms a dense char layer to block heat and mass transfer, while the second additive further enhances the flame-retardant effect and inhibits smoke generation. Combined with the pretreatment modification of metallocene polyethylene, it avoids the agglomeration of flame-retardant components and improves compatibility. Together with the composite additive, it synergistically inhibits flame spread, reduces smoke toxicity release, and improves the flame-retardant efficiency of the cable sheath.

This application discloses a method for the continuous preparation of ethephon, belonging to the field of ethephon preparation. The method includes the following steps: pre-dispersing bis(2-chloroethyl)-(2-chloroethyl)phosphonate, ethephon, and hydrogen chloride gas to obtain a gas-liquid dispersion with a dispersed phase size ≤1 mm; conveying the gas-liquid dispersion to a micro-packed bed reactor for reaction to obtain reaction products; and separating the reaction products to obtain a liquid-phase crude ethephon product. This application, by pre-introducing ethephon into the reaction feedstock system and enhancing the dispersibility of the feedstock system, can accelerate the heat and mass transfer process of the reaction system, significantly improve reaction efficiency, and avoid the generation of by-products. It features high feedstock conversion rate, high product purity, high product space-time yield, and short reaction time, enabling efficient, safe, and continuous production of ethephon with broad application prospects.

The invention provides a method for optimizing a fuel cell flow field plate structure based on thermal-mechanical-electric coupling characteristic analysis. The method comprises the following steps: S1, screening out candidate flow field structures with excellent electrochemical and thermal performance under an ideal condition without packaging force; s2, carrying out structural mechanical property analysis on the fuel cell to obtain runner geometry under a real working condition; s3, in combination with thermal-mechanical-electric comprehensive performance analysis of deformation, evaluating the influence of structural deformation on the comprehensive performance of the fuel cell; and S4, optimizing the flow field plate structure based on the coupling characteristics. The structure of the fuel cell flow field plate is optimized on the basis of mechanics, electrochemistry and hydrothermal distribution coupling characteristic analysis, and efficient heat and mass transfer and optimization design of a fuel cell bipolar plate flow channel are achieved.

This invention discloses a method and continuous production apparatus for polymerizing polyarylene ether nitrile from 2,6-dichlorobenzonitrile and mixed diphenols, belonging to the field of polymer material synthesis technology. The method includes: mixing 2,6-dichlorobenzonitrile with hydroquinone / bisphenol A at a molar ratio of (0.3~0.7):(0.7~0.3), followed by azeotropic dehydration and step-temperature polycondensation in an alkaline catalyst and organic solvent to obtain a polymer viscous liquid; diluting the viscous liquid and spraying it into a 50%~70% ethanol aqueous solution through a high-pressure nozzle to achieve pressurized spray precipitation; subjecting the precipitated solid to multi-stage hot water washing and continuous vacuum drying using a continuous belt filter to obtain the finished product; recovering the solvent from the mother liquor by distillation; and recycling the wastewater after ultrafiltration membrane treatment. This invention effectively balances the rigidity and solubility of the polymer by controlling the ratio of mixed monomers, and significantly improves the heat and mass transfer efficiency of the high-viscosity system by employing pressurized spray precipitation and continuous washing and drying processes, solving the industry pain points of traditional batch precipitation such as easy agglomeration, high solvent residue, and high water consumption.

The invention relates to the technical field of adsorption equipment, in particular to variable-diameter gas adsorption equipment, and aims at solving the technical problems that traditional adsorption equipment is low in adsorption efficiency, uneven in gas flow distribution and poor in heat exchange effect. The equipment comprises a shell, a variable-diameter adsorption bed, a gas flow guiding and dispersing structure and an integrated heat exchange structure, the variable-diameter adsorption bed structure is matched with the concentration gradient change in the gas adsorption process, and stable pushing force is provided in combination with the flow guiding and dispersing structure so as to achieve uniform distribution of gas flow; heat and mass transfer in the adsorption / desorption process is enhanced through an embedded heat exchange structure, and the adsorption capacity and the equipment operation stability are remarkably improved. The device is compact in structure, low in energy consumption and suitable for industrial tail gas treatment, gas purification and other scenes, and has wide application prospects.

The invention belongs to the technical field of high molecular material manufacturing, and particularly relates to a method for preparing high molecular weight polylactic acid in an eccentric rotor extruder, which comprises the following specific steps: carrying out chain extension on low molecular weight polylactic acid with the weight-average molecular weight of 4000-40000 and a chain extender in the eccentric rotor extruder to obtain the high molecular weight polylactic acid with the weight-average molecular weight of 50000-200000. The technical problem that the molecular weight of polylactic acid obtained by an existing high-molecular-weight polylactic acid preparation process is low is solved. According to the invention, the stretching flow field of the eccentric rotor extruder is adopted to strengthen heat and mass transfer, and meanwhile, weak shearing avoids chain breakage of a macromolecular chain, so that the molecular weight is kept, and a crucial role is played in improving the molecular weight of a reaction extrusion product.

The present invention discloses a multi-stage dew point evaporation concentration system and method, comprising a dust collector, a fan, an evaporation device, a regenerator, a preheater, a raw material liquid tank, a feed liquid pump, a mixing tank, a circulation pump, a heater, a first-stage concentrated liquid pump, a concentrated liquid tank, a crystallizer feed pump, a crystallizer and a centrifuge; the present invention provides multiple evaporators and regenerators in the system, and adjusts the liquid flow in evaporators and regenerators of different stages by solution diversion, so that the liquid-gas mass flow ratio in the second-stage evaporator and the second-stage regenerator is higher than the liquid-gas mass flow in the first-stage evaporator and the first-stage regenerator, so as to reduce the temperature and humidity difference in gas-liquid heat and mass transfer and the system entropy increase, improve thermal efficiency, and thus improve the performance of the dew point evaporation system.

A heat and mass transfer system configured to be a passive system using gravitational force to form a thin liquid film flow on an outer surface of a flow distribution head and downstream conduit member to subject the thin liquid film to heat transfer mediums. The at least partially spherical flow distribution head creates a uniform thin flow of liquid on the outer surface increasing the efficiency of the heat and mass transfer system. The heat and mass transfer system may include a heat transfer medium supply system in fluid communication with internal aspects of the downstream conduit such that a heat transfer medium flows within the downstream conduit while the liquid film flows on the outer surface of the downstream conduit. Rather than conventional sheet flow on inner surfaces of a conduit, the flow distribution head enables sheet flow to be formed on an outside surface of a component.