44results about How to "Reduce carbon content" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention provides a preparation method of a lithium manganese iron phosphate material, and relates to the technical field of positive electrode materials. The preparation method of the lithium manganese iron phosphate material comprises the following steps: mixing a first raw material component consisting of ferromanganese oxalate, a first lithium source, a first phosphorus source, a first carbon source and a first doping agent, adding deionized water, grinding, and then carrying out spray drying to obtain a precursor A; mixing a second raw material component consisting of carbon-coated ferromanganese oxalate, a second lithium source, a second phosphorus source, a second carbon source and a second doping agent, adding deionized water, grinding, and performing spray drying to obtain a precursor B; and uniformly mixing the precursor A and the precursor B, sintering in an inert atmosphere, and crushing to obtain the lithium manganese iron phosphate material. According to the lithium manganese iron phosphate material, on the premise of ensuring high specific capacity, relatively high compaction density and relatively high rate capability are realized at the same time.

The invention relates to a smelting method of ultra-low carbon automobile steel capable of reducing carbon emission, which comprises the following steps of: carrying out converter blowing on semi-steel obtained by mixing electric furnace molten steel accounting for 30wt%-70wt% of the total amount and blast furnace molten iron accounting for 70wt%-30wt% of the total amount, and the converter blowing comprises the steps of molten iron pretreatment, converter smelting, LF (ladle furnace) refining, RH (relative humidity) operation and continuous casting. The method has the beneficial effects that (1) the mixed semisteel of the electric furnace molten steel and the blast furnace molten iron is adopted for converter blowing, so that a heat source required by converter smelting is ensured, and carbon emission generated in the blowing process can be effectively reduced; 2) the semisteel process reduces the carbon content of the material entering the converter, and effectively reduces the discharge amount of oxycarbide; and (3) the non-metallic inclusions and the performance of the finished product meet the requirements of ultra-low carbon automobile steel products.

The invention discloses a heat treatment process for relieving large-size carbides of a 17CrNiMo6 large-modulus gear. The heat treatment process comprises the following steps: a) first-time heating: heating a workpiece to a carburizing temperature in a gradient heating manner; b) heat-preservation carburizing: carburizing the workpiece by adopting multi-section pulse carbon potential; c) cooling after carburization: carrying out furnace gradient cooling on the workpiece to 660 + / -5 DEG C; d) heat preservation transformation: the workpiece is subjected to heat preservation at 660 + / -5 DEG C for a period of time, so that dispersed cementite precipitation and pearlite transformation are fully carried out; e) heating and preserving heat for the second time: heating the workpiece to 820 + / -5 DEG C, and preserving heat for austenite transformation; and f) quenching. Therefore, large-size carbides in a gear structure after heat treatment can be reduced, martensite needles in a quenched workpiece are effectively promoted to be smaller and thinner, the content of retained austenite is low, the metallographic structure of the workpiece is guaranteed, the use performance of parts is met, and the heat treatment method is particularly suitable for heat treatment of large-modulus gears.

The invention discloses a manufacturing method of thin-gauge low-yield-ratio Q500qE bridge steel, and belongs to the field of steel manufacturing. The method comprises the steps of component design, casting, heating, rolling, cooling and the like, and finally the required finished steel plate is obtained. The low-temperature impact resistance of the steel plate can be ensured while high strength and low yield ratio of the steel plate are effectively ensured under the condition of low alloy addition. Besides, controlled rolling, cooling and heat treatment processes are combined, the steel plate in the TMCP + T state is obtained, a microstructure with refined ferrite and bainite as main components is obtained in the whole plate thickness, the steel plate has the mechanical property characteristics of high strength, low yield ratio and high toughness, and the low-temperature impact toughness is that the fracture fiber section rate can reach 85% or above at the temperature of-40 DEG C. According to the steel plate, the target performance requirement can be met, the plate shape of the steel plate can be guaranteed, the steel plate has good comprehensive mechanical performance, in addition, the manufacturing cost is low, the carbon content is low, the weldability is greatly improved, and the steel plate has high manufacturability.

The invention discloses coarse slime separation and dehydration combined equipment and a middling coal dissociation and re-separation process, and relates to the technical field of coal processing and mineral separation. A coarse coal slime sorting machine and a scraper vibration centrifugal dehydrator are combined to form innovative integrated equipment, the problems that in the prior art, coarse coal slime sorting precision is low, dehydration efficiency is not high, and the technological process is complex are solved, meanwhile, middling coal treatment is improved, and the utilization rate of the middling coal is improved. The combined process of multi-step crushing, screening, tempering and flotation is adopted, the separation effect of clean coal and gangue is remarkably improved, the recovery rate of clean coal is increased, and the carbon content in tailings is reduced. By means of the improved technological process, efficient recovery of the middling coal and the clean coal is achieved, and the purity of the clean coal and the overall resource utilization efficiency are improved.

The invention discloses environment-friendly carbon-reduction type high-strength and high-toughness concrete and a preparation method thereof, and belongs to the technical field of concrete material preparation. The concrete is prepared from the following components in parts by weight: 265 to 310 parts of cement, 265 to 930 parts of fly ash, 50 to 250 parts of silica fume, 250 parts of gold tailing sand, 20 to 150 parts of water reducing agent, 10 to 20 parts of thickening agent, 30 to 50 parts of hydrated calcium carboaluminate and strip-shaped aragonite whisker mixture and 115 to 500 parts of water, and the water-binder ratio is 0.2 to 0.35. The method has the following beneficial effects that the compressive strength can reach 35 MPa or above, the limit strain can reach 3% or above, and the design requirements of components subjected to high-strength axial compression load and flexural-tensile load at the same time in engineering construction are met; the PVA fiber substitutes with higher strength can be obtained, and the aragonite whiskers and the hydrated calcium carboaluminate can play a bridging effect when the concrete is cracked, so that the toughness of the concrete is improved.

The invention discloses a mold casting molten steel covering agent and a preparation method thereof, and the mold casting molten steel covering agent comprises the following components in parts by mass: 50-65 parts of expanded perlite, 6-10 parts of alumina powder, 2-5 parts of magnesium oxide powder, 25-35 parts of calcium oxide powder, 1-2 parts of fluorite powder, 2-5 parts of ferric oxide, 30-40 parts of porous calcium zirconate, 5-10 parts of calcium carbonate powder and 3-5 parts of acidified graphite. According to the invention, the proportion of carbon element and hydrous aluminosilicate in the covering agent is reduced, the recarburization effect on molten steel is reduced, and the oxidation resistance and thermal insulation capacity of the covering agent are improved.

This invention discloses a method for preparing rare earth metals by electrolytic oxides using a fluoride system, belonging to the field of rare earth metal preparation technology. This invention modifies graphite anodes used in rare earth molten salt electrolysis. It improves oxidation and corrosion resistance, reduces anode wear, lowers replacement frequency, and increases production efficiency, yielding high-purity, low-carbon rare earth metal lanthanum. A three-dimensional network framework material is constructed using Prussian blue self-assembly and SiC is deposited to obtain a composite framework material. During pre-calcination with graphite and other materials, the derivatives optimize the crystal structure and interfacial bonding, enhancing the strength of the pre-shaped anode material and ensuring the integrity and performance stability of the electrode structure. Thirdly, the pre-shaped anode material is impregnated with a specific impregnation solution, altering the gas diffusion path and resistance, inhibiting oxidation reactions, and high-temperature sintering generates substances that fill the pores, forming a dense microstructure. Simultaneously, the compounds formed by phosphoric acid enhance cohesion and adhesion, improving oxidation and molten salt corrosion resistance, and extending the service life of the graphite anode.

The invention discloses a checking plate of a phased array ultrasonic welding spot detector and a checking method of the checking plate. The checking plate comprises a substrate, and a detection column perpendicular to the substrate is arranged on the front face of the substrate; a first groove matched with a detector probe is formed in the back surface of the substrate; the axis of the detection column is collinear with the center line of the first groove. And the base plate and the detection column are made of Q235A steel. The checking plate has the advantages that the checking plate is made of Q235A steel similar to automobile steel, the cylindrical detection column is arranged on the front face, the first groove matched with a detector probe is formed in the back face, the axis of the detection column and the center line of the first groove are collinear, a detector can recognize the detection column and conduct accurate measurement, and the detection accuracy is improved. The accuracy of the phased array ultrasonic welding spot detector can be accurately evaluated, the credibility of the measurement result of the phased array ultrasonic welding spot detector is ensured, and the problem that the phased array ultrasonic welding spot detector cannot be measured in China is solved.

The invention relates to the technical field of coal chemical industry, in particular to a method for improving the efficiency of a two-stage dry powder gasifier and the two-stage dry powder gasifier. A two-stage water cooler of the gasifier is transformed, a shrinkage opening is additionally formed in the two stage of the gasifier, an airflow path in the gasifier is optimized, airflow is gathered to a central area, a spiral rising flowing mode is formed, and the efficiency of the two-stage dry powder gasifier is improved. The residence time of the pulverized coal in a high-temperature area is prolonged, the combustion efficiency is improved, the spiral design of the necking can not only effectively gather airflow, but also form reverse rotation with main airflow in the gasification furnace, so that a medium in the gasification furnace forms disturbance, reactants are in full contact, and the stability of the airflow and the mixing effect of the pulverized coal and the airflow are enhanced; steam injection is added during second-stage coal feeding, steam injection participates in water gas reaction, the content of hydrogen and carbon monoxide in synthesis gas is increased, meanwhile, the combustion temperature is adjusted, and local overheating is prevented. And compared with single use of the necking or the steam, the combination of the necking and the steam further improves the combustion efficiency.

The invention discloses a composite modifier, modified neodymium-iron-boron magnetic powder, a sintered neodymium-iron-boron magnet, a method and application. A composite modifier for neodymium iron boron magnetic powder is formed by a first modifier and a second modifier, the first modifier comprises a first organic molybdenum compound, a solid organic matter and a solid inorganic matter; the second modifier comprises a second organic molybdenum compound and a liquid organic matter. The composite modifier can be used for modifying neodymium-iron-boron magnetic powder, and the magnetic performance of the prepared sintered neodymium-iron-boron magnet can be improved.

The utility model discloses a kind of power station boiler dry slag machine furnace bottom air leakage management devices, specifically related to the field of energy saving and emission reduction of power station boiler, including dry slag machine body, its furnace bottom air leakage is led out through cooling air exhaust interface, furnace bottom air leakage exhaust interface, tail air leakage exhaust interface;Connection pipe;Air blower one, air blower two;Booster fan;Secondary air box outlet;Slag bin, slag discharge room;Transition slag hopper.The power station boiler dry slag machine furnace bottom air leakage management device described in the utility model, by the redesign of the way that traditional dry slag machine cooling air enters hearth, solve the dry slag machine cooling air that is completed heat exchange with furnace bottom slag, as furnace bottom air leakage directly enter hearth to the disturbance of combustion, change dry slag machine cooling air from disordered furnace bottom air leakage to orderly air by secondary air, can effectively improve the stability of hearth combustion, reduce flue gas temperature, reduce fly ash combustible carbon content, thereby improve boiler efficiency, reduce coal consumption.

The invention provides a method for improving oxidation and acid corrosion resistance of a ZG06Cr16Ni5Mo material steel casting, which comprises the following steps: designing chemical components of the ZG06Cr16Ni5Mo material steel casting as follows: less than or equal to 0.03% of C, 0.35-0.55% of Si, 0.70-0.95% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 15.5-16.0% of Cr, 5.5-6.0% of Ni, less than or equal to 0.10% of Mo, less than or equal to 0.15% of Cu, less than or equal to 0.10% of W, less than or equal to 0.03% of V and the balance of Fe, calculating equivalent weights of Creq and Nieq according to the following formula, and ensuring that Creq is less than or equal to 16.8, nieq is equal to Ni + 30C + 0.5 Mn; all the smelting raw materials are subjected to a smelting process and then subjected to heat treatment in a normalizing and secondary tempering process mode. According to the invention, the components of the ZG06Cr16Ni5Mo material, the smelting process and the heat treatment process are reasonably designed, so that the corrosion resistance and the wear resistance of the steel casting made of the material in an oxidizing acid environment such as nitric acid and an oxidizing acid atmosphere at a high temperature are improved.

The embodiment of the utility model relates to an assembly type boiler air pre-heater anti-blocking device, and belongs to the technical field of boiler environmental protection. The assembled boiler air pre-heater anti-blocking device comprises a reheat steam main pipe, the reheat steam main pipe is sequentially connected with a primary air bellow and a primary air main pipe, and first reheaters are arranged in the primary air bellow and the primary air main pipe; the primary air mother pipe is connected with an air feeder, a second reheater is arranged in an outlet air box of the air feeder, the air feeder is further connected with a body drain flash tank of the steam turbine, and the body drain flash tank is connected with a condenser. According to the anti-blocking device provided by the embodiment of the invention, the air pre-heater is prevented from being blocked by ammonium hydrogen sulfate, the differential pressure of the air pre-heater is controlled, the input rate of a soot blower is reduced, steam is saved, and the service life of the air pre-heater is prolonged.

The invention relates to a flexible iron-silica carbon composite nanofiber film and a preparation method thereof.The preparation method comprises the steps that through an electrostatic spinning preparation method, a precursor and a spinning aid are dissolved in an organic solution, and an iron source compound is added into the spinning solution to obtain a precursor composite nanofiber film; and carrying out non-melting treatment, high-temperature pyrolysis and oxidation treatment on the precursor nanofiber film to finally obtain the Fe2O3 / SiOC composite nanofiber film with a structure that Fe2O3 nanocrystals are dispersed and distributed in SiOC nanofibers. According to the preparation method disclosed by the invention, the modification of the SiOC nanofiber is realized by utilizing an electrostatic spinning process for the first time, and the controllable preparation of the Fe2O3 / SiOC composite nanofiber film is realized. The morphology, the structure and the distribution of the nanofibers are controlled by controlling the concentration, the conductivity, the spinning voltage, the yarn outlet rate, the collection mode and the like of a precursor solution, the size of the nanofibers is changed by changing the compounding amount of an iron phase, and the elemental composition and the phase structure of the nanofibers are controlled by changing the pyrolysis temperature and the oxidation treatment temperature. And the product not only has excellent compression elasticity and heat insulation performance, but also shows excellent high-temperature oxidation resistance, and has very wide practical application value.

The invention discloses a multi-coal blending combustion system, and belongs to the technical field of thermal power generation. The multi-coal-type blending combustion system comprises a boiler, a conveying pipe and a plurality of feeding line bodies, the boiler is provided with a hearth and a feeding pipe communicated with the hearth, a guide cylinder is arranged in the hearth, the conveying pipe comprises a connecting section and a vertical section which are arranged in a communicated mode, and the feeding line bodies are arranged in the connecting section. One end of the connecting section extends out of the boiler and is used for conveying pulverized coal with the water content exceeding the set standard, at least part of the vertical section is arranged in the guide cylinder, a reverse channel is limited between the vertical section and the guide cylinder, and the two ends of the reverse channel are communicated with a hearth and an inner cavity of the vertical section respectively; and the feeding line body is used for conveying pulverized coal to the feeding pipe or the connecting section. According to the multi-coal blending combustion system, it can be guaranteed that pulverized coal is fully combusted during pulverized coal blending combustion so as to meet the heat supply requirement of a boiler, the carbon content of fly ash is effectively reduced, and the production cost is reduced.

The invention discloses a preparation method of medium-carbon ferrochrome in oxygen blowing refining, relates to the technical field of ferroalloy smelting, can solve the problems that a traditional processing technology needs to consume a large amount of electric energy and can discharge a large amount of carbon dioxide, and realizes processing treatment of high-carbon ferrochrome by using a method of replacing electricity with oxygen by using processing steps of S1-S2-S3-S4. The oxygen blowing refining process in the converter is utilized, the carbon content in the ferrochrome can be effectively reduced, meanwhile, redundant impurities such as silicon and sulfur can be removed in the refining process, the purity of the ferrochrome is remarkably improved, the oxygen blowing refining technology of replacing electricity with oxygen is adopted, oxygen can react with carbon in high-carbon ferrochrome to generate carbon dioxide gas, and the purity of the ferrochrome is improved. Therefore, the carbon content in the ferrochrome is effectively removed, the carbon content is controlled within the range of medium-carbon ferrochrome, the influence of too high carbon content on subsequent processing and use performance is avoided, the production capacity and stability of a converter can be improved to a certain extent, energy waste is reduced, and the production cost is reduced.

This invention relates to the field of ship dredging equipment technology and discloses a welding process for steel pile marking lines, comprising: S1: machining grooves on a plate; S2: welding an isolation layer weld on the bottom and sides of the groove; S3: welding a cover layer weld on the isolation layer weld; S4: grinding the weld to form a marking line; S5: rolling, assembling, and welding the plate with the marking line facing outwards to form a steel pile, wherein the marking line is ring-shaped and encircles the outer perimeter of the steel pile. This invention, by machining grooves and welding marking lines before rolling and welding the plate to form the steel pile, reduces the labor intensity of the marking line welding operation, increases welding efficiency, reduces the number of weld joints, and ensures stable and reliable welding quality. Furthermore, the isolation layer weld reduces the migration of carbon elements from the steel pile plate to the cover layer weld of the steel pile marking line, lowers the carbon content of the cover layer weld, and improves the corrosion resistance of the cover layer weld.

The carbon dioxide top and bottom blowing system comprises a liquid carbon dioxide storage tank, a heater, a buffer tank, a top blowing pipeline and a bottom blowing pipeline, a liquid carbon dioxide outlet end at the bottom of the carbon dioxide storage tank is connected to a feeding hole of the buffer tank through a pipeline; and the heater is arranged on a pipeline between the liquid carbon dioxide outlet end at the bottom of the carbon dioxide storage tank and the buffer tank. According to the system, carbon dioxide can react with carbon in molten steel, so that the carbon content is reduced, the consumption of oxygen is reduced, the production cost is reduced, and compared with argon, the carbon dioxide is generally cheaper, so that the production cost can be reduced by using the carbon dioxide; in addition, the carbon dioxide can react with sulfur in the molten steel to generate compounds such as calcium sulfide, so that the sulfur content in the steel is reduced, the quality of the steel is improved, and the nitrogen content in the molten steel can be reduced and the quality of the steel can be improved because the carbon dioxide does not contain nitrogen.

The present application relates to a kind of printing and dyeing sludge biological treatment photovoltaic cell drive near-infrared targeted drying method and device, the present application is directed to the characteristics of active organic matter, inert organic matter, heavy metal etc. in sludge, the light initiator with strong near-infrared light absorption capacity, stable chemical properties, low price is introduced into the printing and dyeing sludge after biological pretreatment, the organic matter often on the surface of nano particle and macromolecular solid organic matter in sludge can be closely combined, when these nano particles are irradiated by near-infrared light, its surface will occur plasmonic resonance phenomenon, leading to strong electric field and heat generation, so that near-infrared energy is efficiently focused around target material, near-infrared targeted heating drying is realized, and sludge treatment rate is significantly improved. Metal nanoparticles interact with bacterial cells by charge, destroy their membranes and walls, destroy charge exchange, interfere with ribosome assembly and enzyme activity, achieve the effect of sterilization and disinfection.

The invention discloses a preparation method of a fuel pellet and a U3Si2 fuel pellet. The method comprises the following steps: carrying out compression molding on U3Si2 powder containing a binder to obtain a U3Si2 green body; and after the U3Si2 green body is subjected to heat preservation at the target temperature for a target duration, the U3Si2 green body is sintered in a carbon-isolated environment, and the fuel pellet is obtained. According to the method disclosed by the invention, before the green body is sintered, heat preservation is performed on the green body at the temperature close to the melting point and the decomposition point of the binder to fully remove the binder in the pellet green body, so that the binder in the pellet is removed, and the carbon content in the U3Si2 green body is reduced. And sintering the U3Si2 green body in a carbon-isolated environment to further inhibit the reaction between the carbon in the environment and the green body. In this way, the carbon content in the U3Si2 pellet can be controlled to be 0.2 wt.% or below, then the problem of pellet cracking is solved, and the U3Si2 fuel pellet without cracks on the appearance is obtained.

The invention discloses a MIM injection molding process for a NdFeB magnet, comprising the steps of adjusting raw material ratio, melting and strip-spinning to form strip-shaped sheets, crushing, mixing with a mixed solution of a coupling agent and ethanol, mixing and kneading with a binder, oriented injection molding, extraction degreasing, thermal degreasing, sintering, magnetizing and the like. By optimizing raw material components, oriented injection molding, extraction degreasing, thermal degreasing and the like, near-net-shape forming of a complex shape is achieved, and the MIM NdFeB magnet can achieve excellent magnetic properties with residual magnetization intensity ≥1.04 T and maximum magnetic energy product ≥29.7 MGOe, and greatly improves the magnet yield and production efficiency.

The invention discloses amino low-carbon broad-spectrum fuel oil and a preparation method thereof.The fuel oil is mainly prepared from, by mass, 25%-29% of liquid ammonia, 55%-68% of alcohol and 7%-16% of fuel oil, and the preparation method comprises the following steps that under the reaction conditions that the temperature is 400 + / -10 DEG C and the pressure is 2 MPa, the liquid ammonia and the alcohol are mixed in proportion for an amination reaction, and the amination reaction is carried out; and cooling an alcohol amine reaction product generated by the amination reaction to 30-60 DEG C, purifying and separating, and stirring and mixing with the fuel oil to obtain the amino low-carbon fuel oil. The amino low-carbon broad-spectrum fuel oil is high in calorific value and good in combustion performance, and is novel low-carbon amino fuel oil with great development potential.

The present application relates to the technical field of boiler combustion, and discloses a direct combustion burner and a combustion system, wherein the combustion system directly sends hydrogen-oxygen mixed gas obtained by electrolysis of water into the combustion burner, thereby eliminating investment in purification equipment and energy consumption. The direct combustion burner is provided with a first nozzle and a second nozzle, the first nozzle converges towards the axis of the pulverized coal channel, can heat the core area of the pulverized coal jet, and is favorable for improving the ignition condition; the second nozzle is parallel to the axis of the pulverized coal conveying pipe, forms a wake flow at the periphery of the pulverized coal jet, plays a stable combustion and wrapping heating role, and is helpful to enhance the flame stability. Multiple small-aperture nozzles disperse the hydrogen-oxygen mixed gas into numerous small jets, form a small flame group which is independent and mutually supported, are helpful to control the size of the local high-temperature area and shorten the residence time of the high-temperature flue gas, thereby inhibiting the generation of nitrogen oxides. The hydrogen-oxygen mixed gas is self-provided with oxygen, the combustion process does not consume additional oxygen in the combustion-supporting air, and is helpful to reduce the carbon content of fly ash.

The invention discloses a replaceable integral tapping hole brick and a preparation method thereof, and belongs to the technical field of refractory materials for converter tapping and slag blocking, the replaceable integral tapping hole brick comprises an integral assembly tapping hole and a repairing material for replacing the tapping hole, and is characterized in that the integral assembly tapping hole comprises a metal steel pipe, a filler seam and a tapping hole sleeve brick, the tapping hole sleeve brick comprises a web brick, a large-head brick, an inlaid matched brick and an inner water gap, and the tapping hole sleeve brick is composed of granular materials and fine powder materials. According to the replaceable integral tapping hole brick and the preparation method thereof, the graphite is subjected to granulation treatment in advance, the granulated graphite with Al-C wrapped MgO particles is obtained, the carbon content is reduced, and meanwhile the high-temperature strength of the tapping hole brick is improved; and meanwhile, the assembly mode of the whole tapping hole brick is optimized and improved, the tapping hole sleeve brick is assembled by adopting a web brick, a large-head brick, an embedded matched brick and an inner nozzle mode, the slag-stopping tapping process requirement of the converter sliding plate mechanism is met, and meanwhile the service life of the tapping hole can be further prolonged.

The invention aims to provide a W-shaped boiler burner based on pulverized coal particle size separation, belongs to the technical field of pulverized coal combustion, and can solve the problems that coarse pulverized coal particles are located on the periphery of the burner and fine pulverized coal particles are located in the center due to airflow rotation inertia of the W-shaped boiler burner; and the problems of delayed pulverized coal ignition, low combustion efficiency, high NOx emission and the like are solved. A vertical downward injection type structure is adopted, and a cross deflection flow guide structure is arranged in the combustor, so that pulverized coal is finally distributed at a contraction nozzle of the combustor in the mode of'centralized injection of center coarse powder and coating of outer layer fine powder '. By means of the structure, fine pulverized coal can be preferentially ignited in a hearth with the low temperature to establish a stable high-temperature field, central coarse-particle pulverized coal is promoted to be completely burnt out, the burning stability of inferior coal and wide-particle-size pulverized coal is remarkably improved, and the loss of unburnt carbon and the generation amount of NOx are effectively reduced.

This invention discloses a combustion system and method for the separate grinding and co-firing of low-volatile and high-volatile coals, relating to the field of coal-fired power generation. The system includes a main air box, a burnout air box, secondary air nozzles, high-volatile coal pulverized coal burners, low-volatile coal pulverized coal burners, and burnout air nozzles. The main air box is divided into a high-volatile coal combustion zone and a low-volatile coal combustion zone, with the low-volatile coal combustion zone located in the lower part of the burner. The burnout air box is located in the furnace height direction away from the main air box, forming a nitrogen reduction and deswirl zone. This invention employs separate grinding and pulverization, and zoned burner arrangement to match the different combustion characteristics and pulverization requirements of low-volatile and high-volatile coals. This achieves a high proportion of low-volatile coal co-firing, effectively improving the stability of the boiler combustion system, increasing the pulverized coal burnout rate, reducing NOx emissions, suppressing the rotation intensity of flue gas at the furnace outlet, and reducing flue gas temperature and steam temperature deviations.

The invention relates to a method for reducing aggregation of Al2O3 inclusions in ultra-low carbon steel, and belongs to the technical field of refining. The method comprises the steps that in the converter tapping process, aluminum slag balls and small-particle lime are added into molten steel so as to carry out slag modification on the molten steel, and RH refining in-station molten steel is obtained; carrying out decarburization treatment on the RH refining incoming molten steel so as to reduce the carbon content in the RH refining incoming molten steel; carrying out deoxidation treatment on the decarburized RH refining incoming molten steel by using a magnesium-aluminum-iron alloy; and the deoxidized RH refining in-station molten steel is continuously subjected to RH vacuum circulation, so that Al2O3 inclusions in the RH refining in-station molten steel are reduced. In the RH refining process, magnesium-aluminum-iron alloy is adopted for deoxidation treatment, stable MgO.Al2O3 inclusions are generated, the inclusions float upwards more easily than independent Al2O3 inclusions and are removed, gathering of pure Al2O3 inclusions at a water gap can be obviously reduced, and therefore water gap blocking of the Al2O3 inclusions in the casting process is reduced.

The invention discloses a preparation method and application of a bio-based polyester polyol, and belongs to the technical field of polymer preparation. The preparation method of the bio-based polyester polyol comprises the following steps: step (1): adding castor oil, a catalyst and glycerol to a reactor, heating and reacting to obtain a composite castor oil; step (2): adding a mixture of composite castor oil, formic acid, phosphoric acid and a resin additive to a container, dripping hydrogen peroxide, heating and stirring to react after the dripping is completed, and then obtaining epoxy composite castor oil; step (3): adding epoxy composite castor oil and toluene to a container, heating and reacting, then dripping a mixture of toluene diphenyl phosphate, toluene and triphenylphosphine, heating and stirring to react, and obtaining a bio-based polyester polyol. The bio-based polyester polyol prepared by the method has excellent flame retardant properties and environmental protection, and its application in the preparation process of polyurethane materials can effectively reduce carbon emissions.