69results about "Increasing energy efficiency" patented technology

The invention discloses a cylinder wall residual heat recovery method and heat transfer device of a dry method cement rotary kiln. A section or multiple sections of fixed outer cylinder walls are sleeved on the outer side of a kiln body of a cement rotary kiln; working medium inlets are arranged at two ends of the outer cylinder wall; an interval is maintained between the kiln body of the cement rotary kiln and the outer cylinder wall and a working medium flow channel and a heat transfer space are formed; the middle part of the outer cylinder wall is provided with a working medium outlet; a cold heat transfer working medium can enter the interval between two cylinder bodies from two ends of each section of outer cylinder wall; the heated working medium is discharged from the fixed outlet at the middle part of the section so as to be supplied to an external heat utilization system and the surface residual heat recovery of the cement rotary kiln is finished. According to the invention, on the basis that the structure of the existing cement rotary kiln body is not changed and the operation of the existing cement rotary kiln body is not influenced, the wasted surface heat of the cement rotary kiln is recovered, not only can the cement production comprehensive energy consumption be reduced, but also the cement kiln body can be protected from exceeding the temperature, and the service life of the cement rotary kiln body is prolonged.

The invention provides a method for effectively restraining generation of sulfur trioxide and waste acid in smelting smoke. By adjusting smoke temperature, and/or controlling the wind leakage amount of a smoke flue, and/or reducing the water content of materials and the sulfate content, generation of the sulfur trioxide and the waste acid in the smoke is restrained. By adjusting parameters such as the smoke temperature, the wind leakage amount, the water content and the sulfate content, generation of the sulfur trioxide and the waste acid is restrained, and compared with the prior art, the method has the beneficial effects that the cost is low, operation is easy, other compounds are not introduced, and generation of the sulfur trioxide and the waste acid in the smoke is restrained from source. The method can be applied to the smoke waste heat recovery and treatment link in the copper sulphide concentrate oxygen enrichment matte smelting process, generation of the sulfur trioxide and the waste acid in the smoke is restrained, and then the problems of corrosion to the smoke flue and waste acid are relieved.

The invention provides a laser wire fusing additive manufacturing titanium alloy component structure refining and isometric crystal converting method. The laser wire fusing additive manufacturing titanium alloy component structure refining and isometric crystal converting method specifically comprises the following steps that an ultrasonic impact micro forging device and a laser wire fusing additive manufacturing device are coupled, and a composite manner that the laser wire fusing additive manufacturing device is arranged in front and the ultrasonic impact micro forging device is arranged onthe back is adopted for synchronous composite manufacturing; according to the workpiece shape, the path is reasonably planned, related parameters of the ultrasonic impact micro forging device and thelaser wire fusing additive manufacturing device are set, effective compatibility is achieved, and the composite manufacturing process is controlled; and according to path planning and system parameters, layer-by-layer ultrasonic impact micro forging treatment is synchronously conducted in the laser wire fusing process till the titanium alloy component additive manufacturing process is finished. The provided method is used for but not limited to the laser wire fusing deposition additive manufacturing technology and can be widely applied to arc wire fusing, plasma arc wire fusing, electronic beam wire fusing and other additive manufacturing technologies.

The invention discloses a metal sample 3D printing forming method with a defect presetting process. The 3D printing forming method comprises the following steps that 1, according to the actual size and shape of a required metal sample, a three-dimensional modeling software is adopted for data model designing; 2, different types of defects of a certain number, size and distribution are designed, and modifying is carried out in a three-dimensional model; 3, the slicing treatment is carried out on the designed model, contour data of each layer are obtained, and a forming path is planned; and 4, proper 3D printing metal powder is selected according to the material of the metal sample, and an SLM 3D printer with appropriate forming size is selected for printing and forming. According to the method, the 3D printing forming method is introduced into the preparation of the metal sample internally provided with the defects for the first time, the existing sample preparation difficulty is greatly simplified, and the sample preparation precision is improved; and a selective laser melting (SLM) 3D printing device is used so that the metal samples with various complex shapes can be prepared.

The invention provides an alloying component and a preparation method thereof. The alloying component takes high-entropy alloy as a matrix, and uses a carbon nano tube and rare earth nano particles asreinforcements, wherein the expression of the atomic percent of the high-entropy alloy is LxMyNz(Fe2/3Nb1/6Ta1/6)100-x-y-z; L comprises at least one of B, Mg, Al, Si, Sr, Ga, Ge, Sn, Sb and Bi; M comprises at least one of Cu, Co, Cr, Ni, Mn, Ag, Zn, V, Ti, Zr, Mo, Hf and W; N comprises at least one of Er, Y, Sc, Nd, Dy, Tm and Gd; and x is larger than or equal to 0 and smaller than 100, y is larger than or equal to 0 and smaller than 45, z is larger than or equal to 0 and smaller than 10, and the sum of x+y+z is larger than or equal to 0 and smaller than 100. The invention can provide the alloying component which refines grains to enables material compositions to be distributed more uniformly, and improves the grain boundary performance and the grain boundary corrosion resistance and thepreparation method of the alloying component.

The invention belongs to the technical field of waste head and complementary energy recovery in iron and steel Industry, and in particular relates to a method for preparing methanol by sensible heat of blast furnace slag. The method comprises the following steps: blast furnace slag enters into a sensible heat recovery device; reactants enter into a grain slag packed bed to be preheated, and enter into a graining reactor when the temperature reaches 600 DEG C; the reactants enter into the graining reactor for reaction at 850 DEG C and at one barometric pressure to generate methanol. High temperature residual heat resources of liquid blast furnace slag are efficiently, economically and environment-friendlily used in an energy-saving manner. Treated blast furnace slag can meet the demand of cement manufacturing, and methanol produced belongs to a product widely applied with high additional value. Ternary reforming reaction of methane can realize part of self-heat supply, so that the energy efficiency in the reaction process is greatly enhanced, the cost is lowered, and carbon deposited on the surface of the catalyst can be alleviated or even eliminated. Coke oven gas resource is adequately utilized, the energy resource is saved, carbon dioxide in flue gas is utilized, and emission of greenhouse gases is reduced, so that the method is energy-saving and environment-friendly.

The invention provides a heat storage type converter waste heat recovery method and device. During a steel-making period of a converter, flue gas is preliminarily cooled through a flue and passes an overheating chamber and a waste heat furnace in turn for waste heat recovery step by step, and an overheating steam product is generated. The cooled flue gas enters a coal gas collection chamber through a deduster and is recovered. At this time, heat storage materials in a vaporized flue, a heat exchange tube set, the waste heat furnace and the deduster store heat. During a non-steel-making period, the heat storage materials in the waste heat furnace and the heat exchange tube set continue to release heat and generate steam so as to realize continuous supply. At the same time, because the heat storage materials release heat, the temperature of each device won't greatly decrease, the device is prevented from fatigue failure due to frequent large temperature difference, and the safety is increased and the service life is prolonged. The heat storage type converter waste heat recovery method and device solve the problems of low waste heat utilization, large energy consumption and high operation cost in a converter waste heat recovery system at present, prolong the service life of each device while meeting the waste heat gradient utilization of the converter, improve the heat energy utilization rate, reduce the operation and maintenance cost, and are suitable for large-scale popularization and usage.

The invention provides a 3D (three-dimensional) printing extruder, a 3D printer and a manufacturing method of the 3D printing extruder. The 3D printing extruder comprises a wire change part and a printing head, wherein the wire change part is equipped with multiple silk input ends, multiple conveying channels and a silk output end, each silk input end is connected with the silk output end throughone conveying channel, the printing head is provided with an extrusion channel, a feeding port of the extrusion channel is in butted communication with the silk output end, the extrusion channel is provided with a discharging port at the outermost end and is conical, the diameter of the extrusion channel is monotonically decreased from the feeding port to the discharging port, and the diameter ofthe feeding port is equal to that of the silk output end; the conveying channels are arranged in a bending manner, and the conveying channels and the curvature center of the conveying channels are located on the same side of an axis based on the extrusion channel. With the adoption of the special bending setting of the conveying channels and the extrusion channel, the conveying channels and the extrusion channel are free of steps, printing materials are input more smoothly and easily, no obvious bridging is produced, and the condition of blockage is prevented.

The invention relates to a method for improving the durability of a GH3536 alloy manufactured by a selective laser melting technology, and belongs to the technical field of alloy melting. The heat treatment process of the GH3536 alloy is adjusted, the heat treatment process of the alloy is optimized, so that the typical high-temperature endurance performance of the alloy is achieved, and the method has great significance in the SLM technology and alloy application. The method has the beneficial effects that the typical high-temperature endurance property of the GH3536 alloy prepared by the SLMcan reach the forging standard, and the anisotropy of the endurance property of the alloy caused by the non-uniform structure of the alloy prepared by the SLM is eliminated.

The invention discloses a composite light beam metal SLM printing system based on Gaussian light beam and light beam shaping and a dual-light-source composite light beam metal SLM printing system. The dual-light-source composite light beam metal SLM printing system comprises a light beam shaper, a light beam coupler and a Gaussian light beam metal SLM printing system, and the light beam shaper and the light beam coupler are sequentially arranged between a first variable magnification speed expanding mirror and a fifth total reflection mirror. A second Gaussian light emitting unit is arranged in the vertical direction of the light beam coupler and comprises a second laser, and a second collimator, a second half-wave plate, a second polarizer and a second variable magnification beam expander which are sequentially arranged in the propagation direction of Gaussian beams emitted by the second laser. The invention further provides a single-light-source composite light beam metal SLM printing system. The system can use a single light source and double light sources to freely combine Gaussian light, annular light and flat-top light, different light paths are freely switched on the basis of the light beam shaping technology, the printing speed, efficiency and quality of parts are improved, and application and popularization of the SLM technology are promoted.

The invention discloses a powder cladding additive manufacturing based method for growing a complex structure on the surface of a cast and forged piece, and belongs to the technical field of metal forming and manufacturing. The method comprises the following steps of: designing a matrix structure part model according to a to-be-manufactured final part and manufacturing the matrix structure part; performing structural design on the surface of the matrix structure part model to obtain a three-dimensional model of the final part; and performing two-dimensional slicing treatment on the three-dimensional model, leading obtained parameters into a 3D printer, and using powder which is the same with the matrix structure part material to perform powder cladding type additive manufacturing on the surface of the matrix structure part through the 3D printer, thereby obtaining the final part. Compared with conventional casting, forging and machining, the method can prevent the cast and forged piecefrom a coarse structure and stress focus, also can avoid a low material utilization rate caused by forged part machining, and does not need to manufacture a dear powder metallurgic mould; and meanwhile, compared with pure 3D printing, the method is higher in production efficiency and is high in product qualification rate.

The invention relates to an induction normalizing method for a steel rail. The method applying an induction heating technology to a normalizing process of seamless welding of a track comprises the following steps: first, carrying out medium frequency induction heating to the normalizing temperature of 840-880 DEG C and keeping the temperature for 8-10 minutes; then introducing cold water into a designed novel induction coil to water cool the induction heated steel rail, wherein the integral steel rail is cooled by water; and finally, naturally cooling the steel rail to room temperature when the temperature of the steel rail is reduced to 445-455 DEG C. Compared with the prior art, by applying induction heating to normalizing of track welding, the environmental pollution problem in the prior art is reduced, the heating speed and the heating efficiency are improved effectively, the time of the whole normalizing process is shortened greatly, and the demand of automation is easily met.

The invention relates to an energy-saving rotary kiln with a long service life. The energy-saving rotary kiln with the long service life is divided into an intermediate-temperature section, a high-temperature section and another intermediate-temperature section from left to right along the axial direction of the rotary kiln, the high-temperature section of the rotary kiln comprises a kiln shell, a refractory lining and a circulation heat exchange system utilizing waste heat of the kiln shell, the kiln shell comprises an outer kiln shell and an inner kiln shell, an annular cavity chamber is arranged between the inner kiln shell and the outer kiln shell, the refractory lining is arranged on the inner surface of the inner kiln shell, and the circulation heat exchange system is connected with the annular cavity chamber. The energy-saving rotary kiln with the long service life has the advantages that the waste heat of the kiln shell can be recycled, the refractory lining is protected against being squeezed by stress of the kiln shell, the integral weight of equipment can be reduced, and effects of saving energy, reducing consumption and improving the operability of the rotary kiln can be realized.

The invention discloses a novel heat recovery boiler of a cement kiln head. Smoke enters the heat recovery boiler through a settling chamber 5, and guide plates are arranged in the settling chamber. By the aid of the structure, the content of dust in the smoke can be reduced, the air speed of the smoke at an inlet of the boiler is reduced, the economic benefit is increased, pipe explosion times of the boiler are decreased, the daily maintenance cost of an owner is saved, the generating capacity is stabilized by the aid of the stable boiler evaporating capacity, and the economic benefit of the owner is increased greatly.

The invention discloses a heat treatment process for a powder part, which is a process for performing high-frequency heat treatment on the powder part. The process comprises the following steps of: 1), preheating: preheating the powder part; 2) air cooling: naturally cooling the powder part for 0.1-1 second in the air; 3) heating: heating the powder part to 800-900 DEG C; 4) air cooling: naturally cooling the powder part for 0.1-2 seconds in the air; and 5) cooling: putting the powder part in quenching liquid to cool for 3-5 seconds. According to precious experience obtained from repeated experiments, the temperature difference inside and outside the powder part in the heating process is reduced through adding the steps of air cooling so as to reduce the possibility of occurrence of cracks, and the control temperature and the keeping time in each step are compared through repeated experiment, so that the optimal effect is achieved. The heat treatment process for the powder part is the improvement based on the conventional equipment and process, and the heat treatment process has the advantages of simplicity, easiness for operation, high pass percentage and the like.

The invention relates to a control method for uniform preheating of a powder bed and an additive manufacturing device. The invention discloses a control method for uniform preheating of a powder bed. The control method comprises the following steps: determining a central point of a to-be-preheated forming area of the powder bed and a farthest point farthest from the central point in the forming area; the minimum preheating power is determined based on the center point, and the maximum preheating power is determined based on the farthest point; a preheating scanning path is planned, and the distance from each point to the center point in the scanning path is determined; determining the preheating power of each point in the scanning path according to the proportional relation between the distance from each point to the central point in the scanning path and the distance from the farthest point to the central point; and scanning and preheating the powder bed according to the determined scanning path and preheating power, and enabling the temperatures of all preheated areas in the forming area to be uniform. According to the method, the non-uniform preheating power is adopted, so that the to-be-formed area is approximately uniformly heated, it is guaranteed that the temperatures of all places of the whole to-be-formed area are approximately consistent, and then the stability of the printing process is improved.

The invention discloses a segmented heating and cooling quenching process for a wheel body of a thrust wheel. The process comprises the following steps of 1, placing and positioning the thrust wheel, wherein the thrust wheel is grabbed through a mechanical arm and placed on a support platform in a quenching device; 2, sequentially conducting intermediate frequency, high frequency and intermediate frequency induction heating on the thrust wheel through induction coil bodies; 3, cooling the thrust wheel obtained after induction heating, wherein spray cooling implemented through water, saline water and oil is sequentially conducted on the thrust wheel obtained after induction heating. According to the thrust wheel quenching process, the water-saline water-quenching oil cooling process is adopted, so that the problems that in the prior art, the quenching speed of a thrust wheel is low, the thrust wheel is deformed and cracked, and the thrust wheel is inconsistent in hardness after being quenched; the quenching process has the advantages of being uniform in thrust wheel hardness and high in quenching efficiency.

The invention belongs to the field of titanium alloy materials, and discloses a titanium alloy for a 3D printing ship. The titanium alloy comprises the following components: 4.0-8.0% of Al, 0.3-2.0% of Mo, 1.0-4.0% of Nb, 0.5-3.0% of Zr, 0.01-0.03% of Y, 0.03-0.12% of O, and the balance of Ti. A preparation method of the titanium alloy comprises the following steps that the materials are preparedaccording to the components of the titanium alloy; the raw materials are smelted and cast into ingots; the cast ingots are machined into rods after cogging and forging; the rods are machined into powder; the powder is screened to obtain titanium alloy powder for the 3D printing ship; and the titanium alloy powder for the 3D printing ship is used as a raw material for preparing a titanium alloy component by a 3D printing technology. The titanium alloy for the 3D printing ship is excellent in strength and toughness matching, is excellent in 3D printing laser forming performance, can be preparedinto a complex titanium alloy component through 3D printing, and is excellent in seawater corrosion resistance and welding performance.

An apparatus and method for removing support material from and/or smoothing surfaces of an additively manufactured part (the “AM part”) is disclosed. The apparatus may include a chamber, a support surface within the chamber, and one or more nozzles within the chamber. The nozzles may be the same size or different sizes. The support surface may be configured to support the AM part. The support surface may have one or more openings sized and configured to allow the fluid to pass through the opening(s). The nozzles may be configured to spray a fluid at the AM part, and the spray may be an atomized or semi-atomized spray of the fluid. For removing support material from parts with internal spaces, such as cavities or passages, the apparatus can include a nozzle at the end of an adjustable flexible hose member that can be adjusted to spray into an internal space of the part. Alternatively, for removing unwanted support material from multiple parts with internal spaces, the apparatus may include a submersion tank.

The invention discloses an automatic cleaning device for a 3D printing cold plate runner. The automatic cleaning device comprises a liquid storage tank (4), a water pump (15) and a connecting pipe (5)and further comprises a washing device box body (13), a display and control console (9), an operating pool (10), a vibration exciter (3), a vibration exciter (3) mounting plate (2), a supporting partition plate (12), a display and control instrument (7), buttons (8), a water draining pipe (11), a filter (14), a tee joint (17), damping supporting legs (6), eight electromagnetic valves and four water route joints. When the automatic cleaning device operates, water in the liquid storage tank (4) can pass through the connecting pipe (5) through the water pump (15) and then is pumped into a cold plate (1) to be cleaned according to a specific water route. Along with scouring by water flow, residual powder in the cold plate can be taken out through the water flow. When the water flow passes through the filter (14), the metal residual powder can be filtered out, and the filtered water flows back into the liquid storage tank (4) to complete flowing circulation. The automatic cleaning device for the 3D printing cold plate runner is small in size, convenient to use, high in degree of automation and simple in operation process.

The invention relates to a heat treatment method of steel bars. The method includes the following steps that a straightening machine is used for straightening the steel bars; induction preheating is conducted, and the preheating temperature is within the range of 820+/-10 DEG C; induction hardening is conducted, the hardening temperature is within the range of 945+/-30 DEG C, the medium water temperature is smaller than or equal to 40 DEG C, the medium concentration is within the range of 6+/-1%, and the feed speed is with the range of 1.75+/-0.25m/min; induction tempering is conducted, the tempering temperature is within the range of 640+/-10 DEG C, the feed speed is within the range of 2.0-2.5m/min, a tempering holding furnace is utilized for tempering and holding, and the holding temperature is within the range of 655+/-15 DEG C, and holding time is within the range of 50+-10min; the straightening machine is reused for straightening the steel bars, tempering residual heat is utilized to eliminate straightening stress, the transfer speed is within the range of 6-12m/min, and the temperature is smaller than or equal to 200 DEG C; a cooling bed is used for cooling the steel bars, the temperature is within the range of 60+/-30 DEG C, and cooling time is within the range of 60+/-10min; the straightening machine is reused for finely straightening the steel bars; a demagnetizer is utilized to conduct demagnetization, and the transfer speed is within the range of 6-12m/min; tempered sorbite microscopic structures are arranged on the surfaces and the centers of the bars, free network ferrites do not exist, the hardness deviation range is within 2HRC, and length errors per meter are smaller than or equal to 0.25mm.

The invention relates to a lead-zinc oxide ore recycling and harmless treatment system and method, and belongs to the technical field of lead-zinc oxide ore treatment. The lead-zinc oxide ore recycling and harmless treatment system comprises a preheating unit, a pre-decomposition furnace, a rotary kiln and a cooling machine, wherein lead-zinc oxide ore is added from the preheating unit, and entersthe pre-decomposition furnace after being heated by direct contact preheating or indirect contact heat exchange with flue gas, the temperature of the material is further increased, and the material enters the rotary kiln to be subjected to a reduction volatilization reaction; zinc oxide smoke dust produced by reduction and volatilization in the rotary kiln is enriched and then recycled; and secondary hot air and low-temperature harmless slag are produced after slag produced by the rotary kiln is cooled by the cooler, the secondary hot air is sent to the pre-decomposition furnace, is used fordrying the material and is recycled by a waste heat boiler, and the harmless slag can be used for producing building materials. According to the lead-zinc oxide ore recycling and harmless treatment system and method, waste heat of flue gas and slag is fully recycled, the advantage of a large specific surface area of powder is fully utilized, the heat exchange and reduction volatilization speeds are increased, the lead-zinc oxide ore treatment capacity and the heat energy utilization rate are greatly increased, and the production cost is reduced.