74results about How to "Improve stirring performance" patented technology

A technology for feeding the rare-earth wire into conticasting tundish features that the molten steel flows from ladle into tundish and then into the crystallizer under the control of stopper, and the rare-earth wire comes into molen steel near the stopper in the tundish and is molten. Its advantages are uniform distribution of rare earth is molten steel, high effect on modifying sulfide, high rate of finished products and impact toughness, for conticast plate, and simple operation.

The invention discloses a stirring device capable of realizing cascading fermentation of solid waste and a reactor. The stirring device comprises a center shaft, a conveying screw and a plurality of stirring blades, wherein the conveying screw is used for axially pushing materials, is concentrically fixed on one side of the center shaft and extends from the shaft end to the middle of the shaft in tapered manner; the stirring blades and the conveying screw are coaxially fixed on the other side of the center shaft. The stirring device can be arranged in a barrel to form the reactor used for the solid waste. The layout standard of the stirring blades is that the axial thrust along the center shaft is not generated in the rotation process. Thus, a layered fermentation system can be formed in the reactor. The system can greatly reduce the mixing ratio of new and old materials, effectively control the standing time of solid materials in the reactor, improve the degradation efficiency of output materials, and increase the final product quality.

The invention provides a device and a method for homogenizing high-temperature melt and belongs to the technical field of melt homogenization. The device provided by the invention consists of three parts, namely a melting tank, a stirring system and a heating system. The detailed steps for homogenizing high-temperature melt carried out by the device provided by the invention are as follows: adding hot silicate slag and quenching-tempering material into the melting tank; after heating to melt the raw material, turning off the power supply; enabling the stirring part of the cooled stirring system to fall into the high-temperature melt, and finishing fall-rise-fall operating actions for stirring the melt in order, wherein the stirring process and the heating process are carried out alternatively; and under the condition that the test result of the samples shows that the composition uniformity and viscosity of the melt are suitable for the process conditions that the fiber is formed or the glass ceramics is prepared, opening a choke plug of the melting tank and making the melt flow out via the flow hole by the gravity of the melt to finish the homogenization process. The homogenizing device and the homogenizing method, provided by the invention, have the advantages of good homogenizing effect, good high-temperature strength and long service life of the stirring part.

The invention discloses a novel polyvinyl acetate (PVA) continuous alcoholysis process. The process comprises the following steps of: adding polyvinyl acetate (PVAc) methanol solution and catalyst sodium hydroxide (NaOH) methanol solution into a prereactor according to a fixed amount and mixing quickly and uniformly; adding mixed solution into a reaction type double-screw extruder to perform an alcoholysis reaction; extruding from a machine head mould to obtain white granular products; and performing treatment of acid neutralization, drying and the like to obtain the final product. The process has the advantages of high reaction speed, high reaction capacity, controllable retention time of reactants, narrower retention time distribution, capability of continuous production and the like. Compared with the traditional process, the process also has the advantages of reducing the using amount of a solvent methanol and a catalyst NaOH, along with low recovery cost of the solvent and alkali and environmental friendliness. The low-alcoholysis-degree PVA product obtained by the process has narrow alcoholysis-degree distribution and stable properties.

A double-horizontal axle concrete-mixer comprises a material barrel, mixing shafts in the material barrel and mixing blades which are connected with the mixing shaft. The mixing shaft is connected with the revolving mechanism of speed reducer of main motor. Two mixing shafts are installed in parallel in the material barrel. The mixing blades on two mixing shafts have same installation form and opposite installation directions. The mixing blades are distributed with a spiral form along the axial directions of mixing shafts. The middle part of mixing shaft is connected with middle mixing blades. Two ends of mixing shafts are connected with end mixing blades. The blade surface of middle mixing blade has a sickle shape. The blade surface of end mixing blade has a kitchen knife shape. The end of knife handle is provided with screw thread. The knife handle traverses the radial preserved hole passage of mixing shaft. The screw thread at end of knife handle is connected with the nut. The double-horizontal axle concrete-mixer of the invention has advantages of stronger mixing capability, simpler structure of mixing shaft, and easy changing and regulation of mixing blade.

The invention discloses a process and equipment for treating wastewater containing cyanide ions. The equipment comprises a security filter, an ion exchanger loaded with cyanogen removal resin, a water injector and a sedimentation tank body. The process comprises the following steps of: after the wastewater is pre-filtered, adsorbing the cyanide ions by the cyanogen removal resin; after the cyanogen removal resin adsorbs the cyanide ions to be saturated, carrying out elution; sucking out hydrocyanic acid formed after elution under negative pressure formed at an outlet of the water injector; and mixing the sucked hydrocyanic acid and cuprous salt solution injected by the water injector to perform a reaction to form copper cyanide precipitates. The process has the principle that the cyanide ions in the wastewater are reduced by an enrichment method, and does not adopt a dispensing or electrolyzing mode just like the conventional method, and thus, the process does not need to consume any energy resources and is more environmental-friendly and the mineralization of water cannot be increased in the whole technological process.

A refining and mixing system adopted in a wet-process phosphoric acid refining process by a solvent extraction method is used for liquid-liquid mixing or liquid-powder mixing and comprises an A type mixing device, a transfer station and a B type mixing device which communicate with each other successively, wherein the A type mixing device has functions including that an external containing body can rotate, a heating body can be arranged and a rotating airflow can be generated, and a stirrer has three functions of body stirring, airflow stirring and enhanced stirring; the B type mixing device has functions including that an external containing body can generate a rotating airflow, a heating body can be arranged and a module can be replaced, and a stirrer has four functions of body stirring, airflow stirring, enhanced stirring, and midway addition of raw materials. The system can eliminate a fluid stagnation zone, can heat a mixed object, has the advantages of good mixing performance and high uniformity, can achieve rotation of an external container, strong lubrication effect, various stirring functions and midway addition, and has a wide range of application.

The invention provides a large-area metal wall surface field patching surfacing welding method. A synchronous moving mechanism is installed on a welding gun of a surfacing welding device, in a surfacing welding process, a graphite sliding block on the synchronous moving mechanism is always located at the back of a welding pool and tightly pressed onto a surface welding layer by an elastic pressing mechanism on the synchronous moving mechanism, the graphite sliding block moves together with the welding gun, and welding current enters into a workpiece through electric arcs from a welding wire of the welding gun and returns to the welding machine power source negative pole from the graphite sliding block. The surfacing welding device comprises the welding gun, a welding machine power source and the synchronous moving mechanism. The synchronous moving mechanism comprises an elastic pressing mechanism and an insulation connecting plate. The elastic pressing mechanism comprises a shell, a pushing plate, a spring, an end cap, the graphite sliding block and a concave disk, and in surfacing welding, the spring generates a pressing force on the graphite sliding block. According to the large-area metal wall surface field patching surfacing welding method, the graphite sliding block is used for achieving the moving type connection between welding machine ground wires and the workpiece, the backward current distribution in the welding pool is strengthened, and combined with an externally added transverse magnetic field or a longitudinal magnetic field, the problems of the welding pool instability and organizational regulation and control caused by the gravity of metal wall surface field patching surfacing welding are solved.

The invention discloses a cement external circulation vertical mill combined high-performance grinding process system, which comprises an external circulation vertical mill, a combined powder concentrator, a cyclone dust collector, a first conveying chute, a dry stirring mill, a second conveying chute, a fine powder blending bin, a coarse powder blending bin and a mixer. The external circulation vertical mill and combined powder concentrator are connected end to end, an upper discharge port of the combined powder concentrator is connected with the cyclone dust collector; a discharge port of the cyclone dust collector is connected with the first conveying chute; an outlet of the first conveying chute is divided into two paths, one path is connected with the dry stirring mill, and the other path is connected with the coarse powder blending bin; a discharge hole of the dry stirring mill is connected with the second conveying chute; an outlet of the second conveying chute is connected with the fine powder blending bin; and outlets of the fine powder blending bin and the coarse powder blending bin are connected with the mixer. The advantages of coarse grinding of the external circulation vertical mill and fine grinding of the stirring mill in the aspects of process and energy consumption are exerted, the fine powder energy consumption of the external circulation vertical mill is reduced, the particle size distribution of the final product can be flexibly adjusted according to the ratio of coarse powder to fine powder, and the cement performance is improved.

The invention provides a high-efficiency nitrogen removal and dephosphorization device and process method using a multi-stage AO composite IFAS technology. The device includes an AI anaerobic tank, anAII anoxic tank, an OI aerobic tank, an OII aerobic tank, an AIII anoxic tank, an OIII aerobic tank and a secondary settling tank. The device and method can improve the efficiency of nitrogen removaland dephosphorization, correspond to existing sewage plant treatment process, get rid of the limitation of use of land, facilitate the implementation of standard upgrade speed up the process of standard upgrade of the sewage plant and greatly improve the technical level of sewage treatment.

The invention discloses a method for promoting RH decarburization. Before or during RH decarburization of ultra-low carbon steel, aluminum or aluminum alloy is added into molten steel, an aluminum oxide reaction is used for forming dispersed Al2O3 inclusions in the molten steel, wettability of the generated Al2O3 inclusions and the molten steel is poor, the wetting angle is large, the Al2O3 inclusions become a heterogeneous nucleation core of carbon monoxide bubbles generated by an RH decarburization reaction, nucleation of the carbon monoxide bubbles is promoted, the nucleation depth of the carbon monoxide bubbles in the molten steel is increased, the thickness of a reaction layer of a carbon-oxygen reaction in an RH vacuum tank is increased, and the ability of RH deep decarburization isimproved. According to the method, the RH decarbonization rate can be effectively increased, the end point carbon content is reduced by (1-10)*10<-6>. The generated carbon monoxide bubbles have smallsizes and a strong ability to catch the inclusions, the removal of the previously generated Al2O3 inclusions can be promoted without polluting the molten steel.

An environment-friendly utilization system for plant waste to generate biogas. The main drive shaft drives the left stirring ball, the middle stirring ball, the right stirring ball, and the rotating fork to destroy and crush the plant waste to be treated in the mixing chamber to reduce the amount of plant waste. volume, and improve the mixing uniformity of plant waste and humidity. The inverted T-shaped rotating fork includes a vertical hook and a horizontal hook. The temperature in the room, the temperature sensor can monitor the temperature in the mixing room to ensure the crushing and mixing effect. This design can not only carry out reciprocating motion in the horizontal direction and switching of the crushing direction, but also has a better crushing effect, can add fermentation drugs online, and has high screening efficiency and feeding efficiency, good crushing effect, and good environmental protection effect of waste utilization .

The invention relates to an upper-layer paddle, in particular to an upper-layer paddle for a high-performance agitating tank, which is suitable for agitating devices for various agitating tanks in the alumina industry. The upper-layer paddle comprises blades, wherein the outer circle of the blades is provided with a circle of upper-layer steel plate cylinder, a ring baffle is arranged below the upper-layer steel plate cylinder, and the upper-layer steel plate cylinder is connected with the side wall of the agitating tank through a support plate. The invention has the following advantages: the upper-layer paddle provided by the invention has a good agitating effect; the upper-layer steel plate cylinder forms a collector for centralizing the liquid flows generated by an agitating paddle to one direction, so that the flow rate is accelerated, the scouring force is greatly increased, and the agitating strength is enhanced; by the ring baffle below the upper-layer steel plate cylinder, the liquid flow overflowing from the lower end of the upper-layer steel plate cylinder turns upwards after being in contact with the ring baffle, so that the effective agitating range of the upper-layer paddle is greatly expanded; a fewer number of layers of blades can meet the requirement for the agitating uniformity, so that the energy consumption is lowered; and an appropriate interval is kept between the ring baffle and the lower end of the collector, so that the energy consumption can be lowered and the cutting on liquid flows can be reduced.

The invention provides an extrusion forming laser welding brazing method. The extrusion forming laser welding brazing method comprises the steps that (1) a solder powder strip is paved in a to-be-welded position of a lower welding block in advance; (2) a first end of an upper welding block is placed in the position, close to the solder powder strip, on the lower welding block, and a 0 to 60-degree included angle space is formed between the upper welding block and the lower welding block; (3) laser beams obliquely shoot from the included angle space, and the laser beams are focused on the solder powder strip to form a strip-shaped brazing molten pool; (4) a second end of the upper welding block is pressed downwards, the strip-shaped brazing molten pool is pushed to be spread on a welding surface between the upper welding block and the lower welding block, and the upper welding block completely fits the lower welding block; and (5) solder is solidified to form a welding connector. According to the extrusion forming laser welding brazing method, the laser beams are utilized to melt solder to form the strip-shaped brazing molten pool, the liquid solder is pushed to be spread on a to-be-welded surface through extrusion, bubbles in the molten pool are released, the metallurgy reaction of a welding brazing connector is sufficient, the technological quality of the welding brazing connector is good, and the mechanical property is high.

The invention discloses a low NOx emission combustor. The low NOx emission combustor comprises a combustion chamber; the front end of the combustion chamber is provided with a fuel gas inlet through afuel gas channel, a flue gas nozzle is arranged at the rear end of the combustion chamber, an air channel with an air inlet is formed in the outer side of the fuel gas channel, and the air channel isin communication with the combustion chamber through air nozzles arranged in the air channel; and the rear end of the fuel gas channel is provided with a gas guide cone through a supporting rod. Thedevice is simple and compact in structure, small in occupied space and easy to install and maintain, the volume of the combustion chamber is smaller than that of a heating furnace hearth of a common combustor, and the volume heat strength is large and can reach 6*10<8> kJ/m3.h; the width of the adjusting range can reach 1:50, while the common combustor is only 1:10, and automatic regulation and control are easy; and in addition, the air can be preheated by high-temperature, high combustion temperature can be obtained with low-heating-value fuel gas, the combustion temperature of the combustionchamber is high and close to 2000 DEG C, and therefore the combustor can be applied to most industrial furnaces.

The invention provides an agitation tank comprising a sealed tank body. The bottom of the tank body is conical while the top is cylindrical, a feed inlet and a discharge outlet are arranged in the top end and the bottom end of the tank body respectively, supporting legs used for supporting the tank body are arranged on the side wall of the tank body, a rotating shaft is vertically arranged at internal center of the tank body, the top end of the rotating shaft extends out of the tank body and is driven to rotate via a motor at the top end of the tank body, the bottom end of the rotating shaft extends to the inner bottom of the tank body, a powerful agitating paddle is mounted to the bottom end of the rotating shaft, a stirring agitating paddle is mounted to the middle of the rotating shaft, and common agitating paddles are mounted on the rotating shaft between the powerful agitating paddle and the stirring agitating paddle. The agitating paddles of multiple types are used in combination, so that agitation performance of the agitation tank can be improved effectively.

The invention discloses equipment and method for electric arc furnace steelmaking by using oxygen combustion guns, and belongs to the technical field of electric arc furnace steelmaking. The equipmentis mainly characterized in that the oxygen combustion guns are inserted into a furnace from electrode holes of an electric furnace cover, and high-temperature and high-energy flames produced by the combustion of oxygen and gas which are sprayed by the oxygen combustion guns are utilized to heat and melt scrap steel in the electric furnace; and after the scrap steel is melted to form a molten pool, the molten pool is blown with the oxygen combustion guns for temperature rise, carbon reduction and slagging operation. The oxygen spray pipes of the 6-hole oxygen combustion guns of the equipment are each of a Laval type spray pipe structure, and have the dual functions of combustion heating and oxygen blowing for carbon reduction. According to the electric furnace, the three oxygen combustionguns are inserted into the electric arc furnace for steelmaking, the electric power for the electric arc furnace can be saved by 20-50%, the electrode consumption of the electric arc furnace can be reduced by 70-90%, and the cost per ton of steel can be reduced by 10-35%.

The invention discloses a stirring reactor and application thereof in condensation reaction of a Grignard reagent. The reactor comprises a kettle body, a stirring device, a cooling device and a feeding device, wherein the stirring device comprises a stirring shaft, a driving mechanism for driving the stirring shaft and a stirring paddle fixedly connected with the stirring shaft; the stirring paddle is formed by at least one blade group; the blade group comprises a hub in the center of which a through hole is formed, a disk which is fixedly connected onto the periphery of the hub and a plurality of blades which are uniformly connected onto the disk; the hub is mounted on the stirring shaft through the through hole in a sleeving manner; the root and the end part of each blade form a torsion angle of 5 to 90 DEG; and the included angle between the edge of the root of each blade and the plane perpendicular to the stirring shaft is 5 to 90 DEG. Through the stirring reactor, the mixing effect is excellent, no mixing dead zone can be generated, and materials can be distributed uniformly, so that the stirring reactor is particularly suitable for the condensation reaction.