16results about How to "Reduce burning rate" patented technology

The application relates to the alloy preparation technical field and provides a preparation method of a high-performance tin-copper alloy wire, which comprises the following steps: tin and copper are smelted in a vacuum environment, and then cooled to obtain a tin-copper intermediate alloy; pure copper and the tin-copper intermediate alloy are smelted and refined in a vacuum environment, and then the alloy solution after the refining is drawn to prepare a tin-copper alloy rod; the tin-copper alloy rod is vacuum heat-treated, vacuumizing is stopped after the heat treatment temperature reaches 750-900 DEG C, nitrogen-oxygen mixed gas is filled, tin on the surface layer of the tin-copper alloy rod reacts with oxygen to generate tin oxide, heat treatment is carried out after the heat treatment, heating is stopped after the heat treatment is completed, and natural cooling is carried out to obtain a tin-copper alloy rod blank; the tin-copper alloy rod blank after the vacuum heat treatment is subjected to rough drawing treatment. The preparation method disclosed by the application obtains a high-strength high-conductivity copper-tin alloy wire through a vacuum heat treatment internal oxidation technology, and realizes accurate regulation and control of the composition of a copper-tin alloy wire blank.

The application belongs to the technical field of non-ferrous metallurgy, and particularly relates to a low-cost and high-efficiency smelting method for high-homogenization magnesium-lithium alloy, which comprises the following steps: preparing a closed crucible with a proper volume according to the size requirement of the cast ingot for later processing, selecting a seamless steel pipe, welding the bottom of the steel pipe first, adding raw materials, welding the top of the steel pipe and reserving a vacuum interface, pressure welding the reserved vacuum interface after vacuumizing; placing the closed crucible into an industrial electric furnace, heating to fully melt and mix the metal in the crucible; after smelting is completed, taking out the sealed crucible from the electric furnace and vertically placing it into a water cooling tank; uniformly treating the completely cooled crucible first, then removing the steel skin on the surface by machining, and taking out the cast ingot of the magnesium-lithium alloy. The method effectively solves the problems of high burning loss rate, high cost and low efficiency in the traditional vacuum induction smelting process of the magnesium-lithium alloy, and has the advantages of precise alloy component control and uniform distribution of solute elements.

This invention belongs to the field of iron and steel metallurgy technology, specifically relating to a staged combustion system and process for a gas boiler. The system includes a burner connected to the gas boiler, a combustion-supporting gas structure, and a combustion-supporting air structure. The burner includes a combustion stabilizing plate, located at the front end of the burner and connected to the gas boiler. The combustion stabilizing plate has three layers of staged ignition units evenly arranged around its center: an inner layer, a middle layer, and an outer layer. The middle layer ignition unit includes multiple externally mixed combustion nozzles, where combustion-supporting air and gas mix outside the combustion stabilizing plate. The outer layer ignition unit includes multiple internally mixed combustion nozzles, where combustion-supporting air and gas mix inside the combustion stabilizing plate. The combustion-supporting gas structure provides fuel to the burner, and the combustion-supporting air structure provides combustion-supporting air to the burner. This invention effectively achieves complete combustion of the gas, reduces nitrogen oxide production, and provides a stable flame, demonstrating good performance in terms of safety, environmental protection, and efficiency.

The application discloses a novel air premixing flue gas internal circulation ultra-low emission gas combustion device and relates to the technical field of burners.The application solves the problem of excessive initial emission of nitrogen oxides of the existing gas boiler.The main flame injection nozzle is externally sleeved with a main flame gas nozzle;the main flame gas nozzle is provided with a plurality of flue gas entraining holes;the air passage end is provided with an air passage necking portion;the end of the duty flame gas pipe extends into the gas mixing cylinder and is provided with a plurality of duty flame short pipes at the end;the duty flame gas pipe is internally provided with a duty flame nozzle;and the air premixing holes are arranged on the front pipe wall of the duty flame nozzle.The application completes the partial air premixing in the duty flame gas pipe, improves the duty class gas combustion speed, introduces the flue gas into the combustion device, increases the inert gas content in the combustion zone, dilutes the oxygen concentration through heat absorption of the flue gas, reduces the combustion speed and temperature, and thus inhibits the generation of NOx.

This invention discloses a nanoparticle-filled silicone rubber and its preparation method, relating to the field of polymer materials technology. The preparation method of the nanoparticle-filled silicone rubber of this invention includes the following steps: (1) adding 80-100 parts of raw silicone rubber, 10-25 parts of reinforcing filler, 1-3 parts of dimethyl hydroxy silicone oil, 3-10 parts of modified nano flame retardant, 0.05-2 parts of antioxidant, and 0.05-5 parts of lubricant to a mixing mill. Under nitrogen protection, the mixing temperature is 40-60℃, the rotation speed is 20-100 rpm, and the duration is 5-30 min to obtain a mixed mixture; (2) transferring the mixed mixture to an open mill, adding 2-5 parts of vulcanizing agent, mixing evenly, and then extruding and vulcanizing to obtain the product. The product prepared by this invention not only has good flame retardant properties but also excellent strength and toughness. The nanoparticle-filled silicone rubber of this invention can be widely used in high-grade wires and cables, aviation, aerospace, energy systems, electronics, automobiles, and other fields.

The utility model belongs to the technical field of metal smelting, especially disclose high -efficient low oxidization's aluminium smelting equipment, including, smelting pipe: smelting pipe two open end portion fixed and oblique arrangement, electromagnetic heating system: smelting pipe is from top to bottom and divides into first electromagnetic heating system and second electromagnetic heating system, nitrogen protection system: corresponding setting in second electromagnetic heating area is inputted nitrogen gas for its protection, including nitrogen gas inlet and waste gas outlet, wherein, nitrogen gas inlet is placed in the starting end side wall of second electromagnetic heating area, and waste gas outlet is placed in the bottom side wall of smelting pipe. The aluminium smelting equipment realizes aluminium block raw material automatic sliding conveying by the design of oblique smelting pipe, and through the technology of sectional electromagnetic heating and nitrogen positive pressure protection, ensures that aluminium liquid can be isolated from oxygen in the melting stage, avoids aluminium oxidation, makes aluminium burning loss rate reduce to below 1%, significantly improves aluminium liquid cleanliness and production economy.

The application discloses a preparation method of a bichiral polyaniline / biomass carbon composite wave-absorbing material. Biomass with natural helical structure chiral characteristics is subjected to high-temperature carbonization activation treatment to obtain a micron-level chiral biomass carbon precursor. Aniline monomers are in-situ oxidatively polymerized on the surface of the chiral biomass carbon precursor under the joint action of chiral complexing inducers and initiators to obtain nanometer-level polyaniline with chiral characteristics, namely the bichiral polyaniline / biomass carbon composite wave-absorbing material. The preparation process is simple, controllable and green. The composite wave-absorbing material has the double chiral characteristics of the micron-level chiral biomass carbon precursor and the nanometer-level chiral polyaniline and the synergistic effect of the complex three-dimensional conductive network structure formed by the chiral biomass carbon precursors supporting each other, and thus the wave-absorbing performance of the composite wave-absorbing material is greatly improved. The composite wave-absorbing material can fully meet the increasingly harsh wave-absorbing performance requirements in actual applications and is convenient for industrial promotion.

This invention relates to the field of welding materials technology, and particularly to a high-performance aluminum-lithium alloy flux-cored welding wire and its preparation method. The high-performance aluminum-lithium alloy flux-cored welding wire comprises: an aluminum-based metal strip outer sheath; and flux powder filled within the outer sheath. The flux powder includes deoxidizing components, alloy components, arc-stabilizing components, slag-forming components, and binding components. The alloy components of the aluminum-lithium alloy flux-cored welding wire, by mass percentage, include: Cu: 3.7%-4.3%, Li: 0.8%-1.5%, Mg: 0.25%-1%, Zr: 0.1%-0.16%, with the balance being Al and unavoidable impurities. The burn-off rate of active elements is significantly reduced, and the composition control accuracy reaches ±0.05%. The flux structure encapsulates highly active elements such as Li, Mg, and Zr in powder form within the aluminum-based outer sheath, avoiding high-temperature volatilization and oxidation in traditional smelting processes. These elements are released only during welding, achieving precise composition control and enabling the stable preparation of aluminum-lithium alloy welding wires with high Li content (2%-3%).

The invention provides an NEPE propellant and a preparation method thereof, and belongs to the field of propellants. The NEPE propellant provided by the invention is prepared from the following components in parts by mass: 11.001 to 33.01 parts of an adhesive system; the bonding system comprises an adhesive, a plasticizer, a curing agent and a curing catalyst; the adhesive comprises tetrahydrofuran-ethylene oxide copolyether, and the degree of functionality of the tetrahydrofuran-ethylene oxide copolyether is 2.5 to 3; the curing agent comprises dimer acid diisocyanate; 5-20 parts of aluminum powder; 0 to 52 parts of cyclotrimethylene trinitramine; and 5-75 parts of ammonium perchlorate. By changing a bonding system of the propellant and using the tetrahydrofuran-ethylene oxide copolyether and the curing agent dimer acid diisocyanate (DDI), the burning rate and the burning rate pressure index of the NEPE propellant are successfully reduced, and the problem that the burning rate and the burning rate pressure index of the NEPE propellant are too high is solved.

The utility model belongs to the technical field of safety curtains, and particularly relates to a safety curtain which comprises a curtain body, adhesive cloth is adhered to the middle of one side of the curtain body, fixing seats are evenly and fixedly connected to the surface of the adhesive cloth, and connecting cloth strips are evenly adhered to the lower portion of the middle of one side of the curtain body. Cloth holding rings are evenly and fixedly connected to the surfaces of the connecting cloth strips, and the curtain body comprises shading cloth, flame-retardant cloth and sound insulation felt. During working, several groups of connecting cloth strips with different heights and cloth holding rings for children to hold are arranged below one side of the curtain body, and the cloth holding rings can provide a holding point for children when the children play on the curtain body, so that the phenomenon that the children fall down due to unstable gravity center and are hurt is reduced; and the middle part of one side of the curtain body is provided with the sticking cloth capable of sticking some educational toys, so that parents of the children can stick some educational toys on the sticking cloth, and the children can be accompanied to grow better.

The present application belongs to the field of intelligent control and information technology, relates to the calculation of the burning loss rate of the dry quenching system, the control of the carbon monoxide (CO) content and the online real-time optimization of the air introduction amount, and is a predictive control method of the dry quenching system based on mechanism and data fusion. The present application uses the existing historical data in the industrial field, combines with the mechanism formula of the dry quenching furnace to construct a mechanism and data fusion dry quenching furnace model, uses the model as a predictive model of model predictive control (MPC) to optimize the control of the dry quenching furnace, and ensures the rapidity and robustness of the control. The present application solves the problem of the high burning loss rate of the dry quenching system during the operation process, causes economic loss and energy waste, achieves good economic benefits, and has great application value in realizing the energy saving and emission reduction of the dry quenching furnace.

The invention discloses a wide-spot tin bronze laser cladding method, and belongs to the technical field of laser remanufacturing. The method comprises the following steps: physically dehumidifying tin bronze powder; the minimum critical preheating temperature of the base material is determined based on the dynamic relation between the molten pool solidification life and the bubble escape time; configuring a rectangular flat-top wide light spot, and calculating a critical power density upper limit based on a tin element saturated vapor pressure model; and performing laser cladding under the condition that the actual power density is controlled to be maintained in a preset safety range. According to the method, the multi-physics field coupling model and the wide light spot technology are combined, the temperature gradient is reduced through the flat-topped light beams, the machining efficiency is remarkably improved, meanwhile, tin element burning loss is effectively restrained, the number and size of air holes in the coating are reduced, and preparation of the tin bronze coating with the low dilution rate and the high quality is achieved.

This invention relates to the field of fire-resistant aluminum composite panel technology and discloses a method for producing and processing fire-resistant aluminum composite panels, including the following steps: Step S1: Raw materials are fed into the hopper of a twin-screw extruder via a screw feeder and then into the twin-screw extruder. The twin-screw extruder melts and plasticizes the raw materials and extrudes them through a T-die. Step S2: The T-die sends the molten raw materials to a three-roll calender. The three-roll calender cools the molten raw materials and rolls and shapes them into a flame-retardant core board. Step S3: The two sides of the flame-retardant core board are bonded to the aluminum plate with a polymer adhesive film. After cooling and shaping, it becomes a fire-resistant aluminum composite panel blank and is placed in the cutting area for later use. Step S4: The fire-resistant aluminum composite panel blank is cut into the required dimensions according to production requirements. The aluminum plate scraps generated during cutting are separated from the flame-retardant core board. The aluminum plate is sold, and the flame-retardant core board is returned to the screw feeder for recycling. The production process is more environmentally friendly.

The invention discloses a low-cost vacuum melting magnesium-lithium alloy and a high-purity melting and casting method thereof, and belongs to the technical field of alloy melting and casting. The method comprises the steps of material preparation quality inspection, vacuum furnace preheating and air exhaust, argon introduction, stirring and slag fishing after medium-frequency segmented melting of a melt, standing, pouring of the melt into a mold with a pouring gate and a slag removal ladle (a ceramic filter screen is arranged in the mold, and a circulating water cooling disc is arranged below the mold), cooling demolding, machining, oxide skin removal and the like. By optimizing technological parameters and structural design, the problems that in the prior art, magnesium-lithium alloy is uneven in component, many in inclusions, low in availability rate of cast ingots and the like are solved, and the obtained alloy cast ingots are uniform in structure, high in purity and stable in performance; the method effectively solves the problems of non-uniform components, more inclusions, low utilization rate, serious burning loss of a riser shrinkage cavity and the like in the process of vacuum melting of the magnesium-lithium alloy, is simple in process, convenient to operate and controllable in cost, and meets the requirements of the fields of aerospace, 3C electronics, weapon industry and the like on ultra-light high-strength materials.

This utility model relates to the field of sweeper motor technology, specifically a sweeper motor heat dissipation structure, including a motor body, a reducer, and a heat dissipation device. The reducer is located at the drive end of the motor body, and the heat dissipation device is located on the surface of the motor body. The heat dissipation device includes a connecting plate, which is fixedly connected to the motor body. A frame is fixedly connected to one end of the connecting plate, and an air guide sleeve is fixedly connected to the end of the frame away from the connecting plate. A drive motor is fixedly connected to the end of the motor body near the air guide sleeve, and a fan blade is fixedly connected to the drive end of the drive motor. The air guide sleeve is fitted onto the fan blade. In this utility model, replacing the cycloidal pin reducer can improve transmission efficiency and reduce motor overload. The drive motor drives the fan blade to rotate, and the air guide sleeve guides the airflow to the fins to accelerate heat exchange. At the same time, the bending rod drives the brush to clean the dust on the fins. The spring and push rod make the brush fit the concave and convex surfaces of the fins, which greatly improves heat dissipation efficiency and reduces the probability of motor burnout due to overheating and overload.

This invention discloses an ultra-low pollutant emission combustion device for natural gas internal flue gas circulation, relating to the field of burner technology, and solving the problem of excessive initial nitrogen oxide emissions from existing gas-fired boilers. The invention features a flue gas entrainment hole on the main flame gas nozzle; an air channel constriction at the end of the air channel; and a shift flame gas pipe extending into a gas mixing cylinder with several shift flame short pipes at the end. Gas is radially ejected from the shift flame short pipes and axially ejected from the shift flame gas pipes. Upon contact with the mixed combustion-supporting gas after passing through the swirl vanes, ignition occurs. The flame rotates along the sleeve and is ejected into the furnace, superimposing with the gas ejected from the main flame gas nozzle to stabilize combustion. This invention introduces flue gas into the furnace through the high-speed fluid ejection effect formed by the air channel constriction and the main flame ejector nozzle, increasing the inert gas concentration in the combustion zone. The flue gas absorbs heat and dilutes the oxygen concentration, reducing the combustion rate and temperature, and inhibiting NOx formation.