668 results about "Pyrolytic carbon" patented technology

The invention belongs to the technical field of semiconductors, and particularly relates to a gradient transition composite tantalum carbide coating and a preparation method thereof.The gradient transition composite tantalum carbide coating is located on the surface of a graphite substrate material and sequentially comprises a pyrolytic carbon coating, a tantalum carbide-pyrolytic carbon composite coating and a tantalum carbide coating from inside to outside; wherein the thermal expansion coefficient of the pyrolytic carbon coating is 2.5-4.5 * 10 <-6 > / K, the thermal expansion coefficient of the composite coating is 4.5-6.0 * 10 <-6 > / K, and the thermal expansion coefficient of the tantalum carbide coating is 6.1-8.0 * 10 <-6 > / K. According to the gradient transition structure of the coating, the problem that thermal expansion coefficients between the coating and a base body are not matched is solved, the thermal shock resistance of the coating is effectively improved, meanwhile, the pinning effect can be achieved, the adhesive force between the coatings is enhanced, and the service life of a product is prolonged; compared with a single tantalum carbide coating, crack accumulation and through holes cannot be generated.

The invention discloses a method for recycling iron and manganese and preparing a cementing material by synergistically utilizing electrolytic manganese residues and waste incineration fly ash and a product thereof, the method comprises the following steps: mixing ardealite and electrolytic manganese residues, and uniformly stirring to obtain gypsum manganese residues; calcining the gypsum manganese slag to obtain activated slag; mixing the activated slag material, municipal sludge and waste incineration fly ash, and uniformly stirring to obtain an initial roasting material; the initial roasting material is subjected to continuous pyrolysis carbonization, pyrolysis flue gas dust recycled in the first pyrolysis process is coarse iron powder, pyrolysis flue gas dust recycled in the second pyrolysis process is coarse manganese powder, solid residues obtained in the second pyrolysis process are gelatinized activated residues, the gelatinized activated residues are ground into powder, and the cementing material is obtained. The preparation process is simple, and the required raw materials are only electrolytic manganese residues, waste incineration fly ash and common industrial solid wastes.

The invention discloses a high-thermal-conductivity carbon skeleton resin-based composite material and a preparation method thereof, and belongs to the technical field of thermal conductive composite materials. The preparation method comprises the following steps: firstly, preparing a fibrofelt preform from chopped mesophase pitch-based carbon fibers, and growing carbon nanotubes on the carbon fibers in situ by adopting a chemical vapor deposition process; depositing a layer of pyrolytic carbon through a chemical vapor infiltration process, and jointly connecting the carbon nanotubes / pyrolytic carbon with the chopped carbon fibers in the preform to prepare a porous hybrid network structure; carrying out graphitization treatment on the network structure to obtain a high-thermal-conductivity hybrid carbon skeleton composed of carbon fibers, carbon nanotubes and pyrolytic carbon; and impregnating polymer resin into the hybrid carbon skeleton structure through an impregnation process, and curing to obtain the carbon skeleton resin-based composite material. According to the prepared carbon skeleton resin-based composite material, when the volume fraction of the carbon skeleton accounts for 19.2 vol%, the thermal conductivity in the thickness direction of the composite material reaches 20.9 W / m.K which is 99 times of the thermal conductivity of pure epoxy resin, and the carbon skeleton resin-based composite material can be used as a novel thermal management material.

The invention relates to a high-temperature structure bearing / anti-ablation integrated ceramic matrix composite and a preparation method thereof.The preparation method of the composite comprises the steps that a pyrolytic carbon interface layer is deposited on the fiber surface of a carbon fiber preform through a chemical vapor deposition method, and a low-density C / C base material is obtained; the density of the carbon fiber preform is gradually increased from the surface to the inside; the preparation method comprises the following steps: carrying out first vacuum impregnation, first pressure impregnation, first curing and first cracking on a low-density C / C base material by adopting phenolic resin to obtain a porous C / C intermediate; carrying out reactive infiltration on the porous C / C intermediate by adopting an alloy infiltration agent to generate a multi-element ultra-high-temperature ceramic matrix, so as to obtain a multi-element ultra-high-temperature ceramic matrix composite material; and preparing an anti-oxidation ceramic protective layer on the near surface of the multi-element ultrahigh-temperature ceramic-based composite material to obtain the high-temperature structure bearing / anti-ablation integrated ceramic-based composite material. The ceramic-based composite material prepared by the preparation method has good high-temperature structure bearing performance and oxidation ablation resistance.

The invention discloses a method for preparing a waste gas purification catalyst from red mud and electrolytic manganese residues, a product and application thereof, and belongs to the field of solid waste resource utilization. According to the method, the preparation process is simple, efficient resource utilization of the red mud and the electrolytic manganese residues can be achieved through reasonable burdening, hydrothermal reaction and pyrolysis carbonization processes, and no other waste liquid or secondary solid waste is generated in the preparation process. The prepared waste gas purification catalyst is excellent in catalytic performance and can be used for quickly converting harmful gas of 1, 2-dichlorobenzene.

The invention provides a preparation method of an anti-blow-off porous carbon material for a silicon-carbon negative electrode, which comprises the following steps: (S1) preparing a solvent, an emulsifier and a nucleating agent into a mixed solution, adding a resin oligomer and a curing agent, polymerizing into spherical resin under the condition of stirring at 40-80 DEG C, and drying and agglomerating into blocks; the emulsifier comprises a micromolecule anionic surfactant and a polymer emulsifier; (S2) crushing and screening to obtain spherical agglomerates with proper particle sizes, and pyrolyzing and carbonizing the spherical agglomerates in an inert atmosphere to obtain pyrolytic carbon; (S3) performing activated pore-forming on the pyrolytic carbon in an activated atmosphere to obtain an activated carbon aggregate; and (S4) depolymerizing and separating the activated carbon aggregate to obtain the porous carbon material. According to the invention, the spherical particles are greatly agglomerated, the pain point of gas blow-off in the industrial activation process is solved, the activation yield is improved, and meanwhile, the mechanical properties of the material can be adjusted by controlling the crosslinking degree.

The invention provides a green low-carbon recycling and energy conversion coupling method for wine brewing waste, and belongs to the technical field of resource utilization. Comprising the following steps: (1) coarse screening; (2) heat drying; (3) fine screening; (4) pyrolyzing and carbonizing; (5) energy conversion; (6) tail gas treatment; and (7) preparing a liquid-phase product. Aiming at the wine brewing waste treatment and resource utilization process, the invention aims at solving the problem of how to prevent excessive wine brewing waste from being directly discharged into the environment to cause harm to the environment; how to digest huge wine brewing wastes; and how to turn waste into wealth and realize resource utilization of wine brewing wastes. A pyrolysis and carbonization technology is coupled with a green wine brewing technology, and a green low-carbon recycling and energy regeneration coupling technology for wine brewing waste is provided.

The invention provides a plasma coupling thermocatalysis biomass gas phase on-line hydrogenation system and method.The plasma coupling thermocatalysis biomass gas phase on-line hydrogenation system mainly comprises a pyrolysis reaction system, an on-line hydrogenation system and a condensation system.The pyrolysis reaction system comprises a pyrolysis reactor and a pyrolysis gas outlet formed in the pyrolysis reactor; the pyrolysis reactor is used for carrying out pyrolysis reaction on biomass to generate pyrolytic carbon and pyrolysis gas, the pyrolysis gas is discharged through a pyrolysis gas outlet, the online hydrogenation system comprises a hydrogenation reactor, the hydrogenation reactor carries out online catalytic hydrogenation on the pyrolysis gas through hydrogen plasma and a catalyst to generate a hydrogenation product, and the condensation system comprises a condensation tank. And the condensation tank is used for condensing the hydrogenation product to obtain a condensed liquid product and non-condensed gas. According to the process, gas-phase online hydrogenation upgrading can be achieved, the active hydrogen plasma and the gas-phase pyrolysis product are subjected to the catalytic hydrogenation reaction at normal pressure, and compared with a traditional process, the process is small in overall loss and low in energy consumption, and operation is safer and more stable at normal pressure.

The invention belongs to the technical field of pyrolytic carbon black quality detection methods, and particularly relates to a method for determining the specific surface area of carbon black. The method for measuring the specific surface area of the carbon black comprises the following steps: firstly, adding an additive into the carbon black, stirring, centrifuging and filtering; the auxiliary agent is prepared by compounding polyacrylamide, dipolyglycerol dioleate and water; adding water for cleaning, centrifuging, filtering and drying; and finally calculating the specific surface area of the carbon black through a gas adsorption method. According to the method, the carbon black is pretreated, so that the influence of surface oxygen-containing functional groups, aromatic ring impurities and the like on nitrogen adsorption is effectively eliminated, and the problem that the pore structure of the carbon black is damaged by high-temperature degassing in a traditional method is solved through proper microwave irradiation, so that the measured specific surface area result is closer to a true value; methodologies such as precision and repeatability are more stable.

A method for preparing pyrolytic carbon black, especially for preparing pyrolytic carbon black with low ash content and high specific surface area, the method comprising: (1) providing a pyrolytic carbon black particle; (2) preparing a saturated solution of an alkali metal carbonate and immersing the carbon black of step (1) into the above-mentioned saturated solution; removing water from the saturated solution to obtain carbon black deposited with an alkali metal carbonate; (3) immersing the carbon black deposited with an alkali metal carbonate into an acid solution and performing ultrasonic treatment; (4) then filtering, washing and drying to obtain carbon black particles. A large amount of carbon dioxide generated by the reaction of the alkali metal carbonate deposited on the carbon black with the acid, in combination with ultrasonic treatment, greatly reduces the ash content and increases the specific surface area.

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

The invention relates to the technical field of inorganic non-metallic materials, in particular to an onion carbon preparation method based on a metal organic framework and onion carbon. The preparation method comprises the following steps: S1, synthesizing a metal organic framework precursor; s2, preliminary pyrolysis of the metal organic framework precursor; s3, etching and decomposing the formed metal particles; and S4, carrying out secondary pyrolysis on the primary pyrolytic carbon material. The carbon diameter of the prepared onion is 5-20 nm, and the carbon layer spacing is 0.34 nm. According to the preparation method, a metal organic framework is taken as a precursor, a two-step pyrolysis method is adopted, the precursor is carbonized at high temperature, a carbon material is etched again by ammonia gas and other gases released by thermal decomposition of melamine, and under the action, graphene is rearranged in the form of the same sphere center layer to form onion carbon particles with uniform sizes. The temperature and the reaction time in the preparation process can be accurately controlled, the preparation process is simple, the cost is low, the prepared onion carbon has relatively high purity and uniformity, and the oxygen reduction catalytic activity can be improved.

The invention discloses biomass charcoal prepared through pyrolysis-water quenching and a method for preparing iron ore pellets through the biomass charcoal, and belongs to the technical field of iron ore pellet production. Biomass raw materials are pyrolyzed, pyrolytic carbon generated through pyrolysis is rapidly subjected to water quenching at the pyrolysis temperature, then filtering separation, drying and grinding are carried out, and the biomass charcoal is obtained and has the advantages of being low in ash content, low in K and Cl content, high in heat value, low in volatile component content, good in combustion performance and the like, meets the requirement for internal matching of pellets and has the advantages of being environmentally friendly and free of pollution. The coal-based fossil fuel can completely or partially replace fossil fuel for use, and the dependence on the coal-based fossil fuel and the emission of CO2 and pollutants in the iron ore pellet production process are reduced on the premise that normal production of the iron ore pellets is not affected.

The invention discloses a preparation method of an anthracite-based soft and hard carbon composite negative electrode material of a sodium ion battery, and relates to a preparation method of a soft and hard carbon composite negative electrode material. The invention aims to solve the technical problems of tedious operation and high cost of the existing preparation method of the soft and hard carbon composite sodium ion battery negative electrode material. The method comprises the following steps: crushing anthracite until the particle size is less than 75 microns, and then heating to 1000-1400 DEG C under the protection of inert gas for pyrolysis and carbonization to obtain an anthracite-based soft carbon material; and grinding and mixing with a hard carbon material to obtain the soft and hard carbon composite negative electrode material. The initial specific capacity of the soft and hard carbon composite negative electrode material is 259-260 mAh / g, the coulombic efficiency of the first circle reaches 73%-75%, the capacity retention ratio reaches 81%-84% after 500 cycles, and the soft and hard carbon composite negative electrode material has good comprehensive performance, and meanwhile, the preparation method is simple and low in cost. The invention can be used in the field of sodium-ion batteries.

The invention discloses a system and a method for co-producing graphite carbon and hydrogen through biomass two-stage pyrolysis, and belongs to the technical field of biomass pyrolysis. The system comprises a low-temperature pyrolysis module and a continuous Joule thermal pyrolysis module. The Joule pyrolysis reactor is designed into a wheel disc type, so that biomass pyrolysis reactions can be linked into a whole, the reactions are continuously carried out, the starting and stopping time of a pyrolysis module is shortened, the economical efficiency of the whole system is improved, and graphite carbon and hydrogen are more efficiently obtained. By utilizing the system, firstly, biomass is subjected to low-temperature pyrolysis and condensation to obtain pyrolytic carbon and bio-oil, then the pyrolytic carbon is subjected to Joule thermal pyrolysis, condensation and purification to obtain graphite carbon, bio-oil and hydrogen-rich synthesis gas, the low-cost biomass is used as a raw material to prepare graphite carbon and hydrogen, and fossil resources used in traditional graphite carbon preparation are saved. The system can be better used for industrial production, and co-production of graphite carbon and hydrogen is achieved.

The invention discloses a high-effect sludge deep dehydration coupling resource utilization system and method, and relates to the technical field of sewage treatment.The method comprises the steps that special stirring equipment is adopted for stirring sludge, the stirred sludge is pretreated through ultrasonic waves and an advanced oxidation technology, and pretreated sludge is obtained; discharging free water and interstitial water from the pretreated sludge through an intelligent pressure maintaining and pressure relief regulation mechanism, then carrying out microwave-assisted heating by using a continuous low-temperature sludge drying machine, and adjusting microwave power and heating time to deeply remove bound water and interstitial water; carrying out pyrolysis carbonization on the sludge subjected to microwave-assisted heating through an indirect heating reaction furnace, and converting organic matters in the sludge into pyrolysis products; the sludge treatment efficiency and quality are remarkably improved through a series of innovative technologies, the special stirring equipment is combined with ultrasonic waves and the advanced oxidation technology, the physical and chemical properties of the sludge are optimized, and the energy consumption of the subsequent process is reduced.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a method for preparing porous carbon through secondary utilization of porous carbon airflow fine powder, which comprises the following steps: (S1) mixing the porous carbon airflow fine powder and a binder according to a mass ratio of 100: (15-30), and then carrying out curing reaction to obtain a precursor; the binder comprises thermosetting phenolic resin, an epoxy silane coupling agent and fumed silica; (S2) after crushing and screening the precursor, performing pyrolysis carbonization in an inert atmosphere to obtain pyrolytic carbon; and (S3) activating the pyrolytic carbon under an activation atmosphere condition to obtain the porous carbon material. According to the method, the specific adhesive is utilized, the airflow fine powder which is difficult to recycle is well reutilized, additional equipment does not need to be added, the airflow fine powder does not need to be subjected to complicated particle size screening, and secondary utilization of the airflow fine powder can be completed through existing equipment.

The invention relates to the field of ceramic matrix composite bolt preparation, in particular to a high-strength ceramic matrix composite bolt production and processing technology which comprises the following steps: obtaining a rod-shaped preform with a cladding structure and a core structure, hanging the rod-shaped preform in a vapor deposition furnace, and depositing a pyrolytic carbon interface layer on the fiber surface of the rod-shaped preform to obtain the high-strength ceramic matrix composite bolt. Carrying out high-temperature treatment; placing the treated rod-shaped prefabricated body in a vacuum dipping barrel; pumping the ceramic precursor slurry into a barrel, carrying out argon pressurization, heating, heat preservation and furnace cooling, then taking out the ceramic precursor slurry, respectively carrying out vacuum cracking treatment under low-temperature and high-temperature conditions, and after heat preservation, naturally cooling the ceramic precursor slurry to room temperature in an argon atmosphere; preparing a silicon carbide matrix to obtain segmented bars; the segmented bars are ground and machined; and a ceramic coating is prepared on the surface of the bolt with the outer threads machined, the ceramic coating is silicon carbide, and the ceramic-based composite material bolt is obtained. The method aims at optimizing the cracking temperature in the cracking treatment process of the ceramic matrix composite bolt.

The invention relates to the technical field of runner inserts in fusion reactor cladding structures, in particular to a SiC ceramic-based composite runner insert and a preparation method and application thereof.The preparation method includes the steps that a pyrolytic carbon interface is deposited on SiC prefabricated cloth, and the SiC prefabricated cloth deposited with the pyrolytic carbon interface is obtained; the preparation method comprises the following steps: mixing SiC powder, ZrO2 powder and Al2O3 powder to obtain a filler powder mixture, mixing the filler powder mixture with water, and then adding polycarbosilane to obtain mixed slurry; the mixed slurry is coated on SiC prefabricated cloth, a SiC prefabricated cloth deposition silicon carbide substrate is subjected to densification treatment and finish machining, then a silicon carbide coating is prepared through chemical vapor deposition, and the SiC ceramic-based composite flow channel plug-in is obtained. The preparation method aims at further enhancing the heat insulation performance and the insulating performance of the SiC ceramic-based composite flow channel plug-in, improving the heat insulation performance of the SiC ceramic-based composite flow channel plug-in and improving the heat insulation performance of the SiC ceramic-based composite flow channel plug-in. The average temperature at the outlet of the runner insert is increased, the pressure drop of the magnetofluid is reduced, high-efficiency energy conversion is realized, and meanwhile, long-term safe operation of a reactor is ensured.

The invention provides a method for improving the efficiency of an anaerobic membrane bioreactor and relieving membrane pollution by pyrolytic carbon, in the starting stage of the anaerobic membrane bioreactor, a conductive material SC is added into the reactor for anaerobic digestion reaction, and the conductive material SC is a carbon material which is obtained by heating and pyrolyzing sodium citrate and has a honeycomb structure. According to the scheme, SC is used as a conductive carrier in the anaerobic membrane bioreactor, and the anaerobic digestion reaction is promoted by combining the synergistic effect of a magnetic stirring system and a gas circulating pump. Experimental results show that the conduction characteristic of SC can effectively promote electron transfer and enhance the metabolic activity of anaerobic microorganisms, so that the degradation capacity of pollutants is improved, membrane pollution is effectively slowed down, the service life of a membrane assembly is remarkably prolonged to 6 times of the original service life, and the yield of CH4 is increased to 1.39 times.

The invention relates to the technical field of negative electrode materials, in particular to a cylindrical silicon-carbon negative electrode material and a preparation method and application thereof. The silicon-carbon negative electrode material comprises a cylindrical porous carbon skeleton with the diameter of 5-15 [mu] m and the length of 2-20 [mu] m, 10-65% of amorphous nanometer silicon is deposited on the inner wall of a pore channel, a pyrolytic carbon layer is coated on the inner wall of the pore channel, and the carbon skeleton can be doped with 0-10% of nitrogen. The preparation method comprises the steps of resin extrusion molding, carbonization, pore forming, airflow crushing, nanometer silicon deposition and pyrolytic carbon coating. The obtained material has excellent compression resistance and conductivity, is simple to prepare, and can improve the capacity, the first effect and the conductivity and reduce the expansion rate when being used for a lithium battery.

The invention provides a recovery method of a carbon fiber composite material, and relates to the technical field of resource recovery. The recovery method of the carbon fiber composite material provided by the invention comprises the following steps: performing pyrolysis treatment on the carbon fiber composite material in an inert atmosphere to obtain a pyrolysis treatment product; and carrying out oxidation treatment on the pyrolysis treatment product in an oxygen-containing atmosphere to obtain the regenerated carbon fiber. The recovery method provided by the invention is simple to operate and high in recovery rate, pyrolytic carbon can be removed, and relatively good mechanical properties can be retained. The method not only relieves the solid waste treatment pressure of the carbon fiber composite material of the retired wind power blade, but also reduces the cost of the carbon fiber under the condition of meeting the performance requirements of the regenerated carbon fiber, and has great environmental protection and economic significance.

The invention provides a preparation method of a high-temperature-resistant graphite pipe for spectral analysis, and belongs to the technical field of spectral analysis, and the preparation method comprises the following steps: S1, preparing a high-purity graphite pipe matrix and carrying out surface activation treatment; s2, preparing composite sol, wherein the composite sol is formed by mixing silica sol, molybdate and phytic acid; s3, infiltrating the composite sol into the graphite matrix by adopting a vacuum-pressurization alternate impregnation process; s4, carrying out stepped heating heat treatment in an inert environment to form a SiC-MoSi composite reinforced phase; and S5, depositing a pyrolytic carbon layer on the inner wall of the graphite pipe. The silica sol, the molybdate and the phytic acid have a synergistic effect to form a SiC-MoSi composite phase, the phytic acid can prevent the molybdate from gathering and can promote the growth of SiC whiskers in heat treatment, so that the anti-oxidation temperature of the graphite pipe is increased, the temperature resistance and the heat stability of the graphite pipe are improved, and the anti-oxidation performance of the graphite pipe is improved. And finally, the use frequency of the graphite pipe is greatly increased.

The invention relates to a preparation method of a ceramic-based composite material, in particular to a preparation method of a ceramic-based composite material with a pyrolytic carbon-carbon nanotube interface, which is used for solving the problem that in the aspect of improving the thermal conductivity of an interface layer, metals such as Fe, Co, Ni and the like are widely used as catalysts for growing carbon nanotubes at present, so that the thermal conductivity of the interface layer is improved. Carbon nanotubes obtained through a traditional preparation method are prone to agglomeration and uneven in distribution, the risk of the preparation process is high, the carbon nanotubes are not suitable for large-scale production, although metal particles can be reduced through a chemical plating method, the particle sizes of the metal particles are not controlled, the distribution of the metal particles is uneven, and the requirement of a chemical vapor reduction method for distribution of an earlier-stage metal salt solution is high. And the defect is difficult to realize easily. According to the preparation method of the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface, the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface is finally obtained through pretreatment, solution A preparation, metal salt solution in-situ reduction and chemical vapor deposition in sequence.

The invention discloses a hazelnut shell-based porous adsorption carbon material as well as a preparation method and application thereof, and the method for preparing the hazelnut shell-based porous adsorption carbon material comprises the following steps: carrying out pyrolysis carbonization on hazelnut shells to obtain hazelnut shell carbon; grinding and mixing the hazelnut shell carbon and an activating agent, and activating and pore-forming; and performing acid pickling, water washing and drying on the activated and pore-formed material to obtain the hazelnut shell-based porous carbon material. The hazelnut shell is used as a raw material, and the hazelnut shell-based porous adsorption carbon material with high specific surface area, high hardness, high pore volume, excellent adsorption performance and excellent cycle stability is prepared through an alkali activation process by combining the characteristics of high hardness and rich alkali metal and alkaline earth metal of the hazelnut shell; the method can be effectively applied to treatment of textile wastewater, papermaking wastewater or dye wastewater and the like, pollutants can be removed, resource utilization of waste biomass can be achieved, and the development concept of treating pollution with waste is achieved.

The invention relates to the field of high-value utilization of organic solid wastes, in particular to a biomass pyrolysis poly-generation device with a baking pretreatment system, which comprises a pretreatment furnace, a low-temperature pyrolysis furnace and a high-temperature carbonization furnace. Besides, the invention also provides a pyrolysis poly-generation method, raw materials pass through the pretreatment furnace and then enter the low-temperature pyrolysis furnace to be pyrolyzed, pyrolysis gas and pyrolysis carbon are generated, the pyrolysis gas is collected through a channel and discharged, and gas and liquid products with high combustion performance are obtained through subsequent separation and condensation treatment. Pyrolytic carbon enters a high-temperature carbonization furnace to be further carbonized into activated carbon, and waste heat is recycled for the pretreatment process. According to the invention, pretreatment, low-temperature pyrolysis and high-temperature carbonization are coupled in one system, water vapor generated by pretreatment is used for providing an activator for the carbonization process, waste heat generated by the high-temperature carbonization process is used for providing heat required by pretreatment, efficient pyrolysis and carbonization co-production is realized, and the system has the advantages of efficient energy utilization, energy conservation and environmental protection.

The invention discloses a ceramic component gradient modified C / C-SiC-ZrC composite material and a preparation method thereof, and belongs to the technical field of carbon / carbon composite material matrix modification preparation, a carbon fiber preform and a heating element are placed in chemical liquid phase vaporization deposition equipment, a precursor solution is added until the carbon fiber preform is fully soaked, and a ceramic component gradient modified C / C-SiC-ZrC composite material is obtained; and carrying out chemical liquid phase vaporization deposition reaction to obtain the low-density C / C composite material with porosity in unidirectional gradient distribution. And putting the mixture into a graphite crucible with a carbon-rich area facing downwards and a carbon-less area facing upwards, completely putting the graphite crucible into the ceramic powder for modification, reacting and infiltrating, and cooling to room temperature to obtain the C / C-SiC-ZrC composite material with the gradient modified ceramic components. The end with high ceramic content endows the material with a high-temperature thermal protection function, the end with high pyrolytic carbon content can effectively conduct heat generated in a ceramic-rich area, and the end with low ceramic content can effectively conduct heat generated in a ceramic-rich area. Due to the gradient design from the ceramic-rich area to the carbon-rich area, the material has high-temperature oxidation resistance and ablation resistance and is light, and lightweight design of an aerospace thermal protection structure is facilitated.

The invention relates to the technical field of polymer waste treatment, and discloses a composite curing agent for curing chlorine and sulfur in polymer waste microwave thermal conversion and a preparation method and application thereof, and the method comprises the following steps: dissolving calcium nitrate and aluminum nitrate in deionized water to form an active component I solution; dissolving at least one of zinc nitrate, copper nitrate, ferric nitrate, manganese nitrate and cerium nitrate as an active component II in the active component I solution, adding citric acid into the formed mixed solution to form gel, and drying to obtain an active matter; and mixing the active matter, silicon carbide and bentonite, ball-milling, extruding and granulating, and calcining to obtain the composite curing agent. The composite curing agent disclosed by the invention can efficiently recover pyrolytic carbon, pyrolytic oil and pyrolytic gas while effectively and synergistically curing chlorine and sulfur pollution elements in situ; the curing rate of the chlorine / sulfur element can reach 80%, the recovery rate of the composite curing agent can reach 98%, and meanwhile, the raw material cost is low, and the problems of secondary pollution and equipment corrosion are avoided.

The invention discloses an expansion-resistant lithium battery pole piece material for an unmanned aerial vehicle and a preparation method of the expansion-resistant lithium battery pole piece material, and belongs to the technical field of lithium batteries. Silicon dioxide / carbon fiber composite powder serves as a matrix, the surface of the matrix is coated with a long-chain alkyl cardanol grafted glucose layer, and pyrolysis carbonization is performed to obtain the expansion-resistant lithium battery pole piece material. Carboxyl groups in glucose and isocyanate on the surface of the modified silicon dioxide / carbon fiber composite powder are subjected to an amine esterification reaction, carbon dioxide is generated, the porosity of the material is further improved, cardanol-coated lithium-containing composite powder is obtained, nanometer aluminum oxide is deposited on the cardanol-coated lithium-containing composite powder through a coprecipitation method, and the composite material is obtained. By forming a ternary composite structure with the silicon dioxide / carbon fiber composite powder as a core layer, the carbonized long-chain alkyl cardanol grafted glucose as a middle layer and the nanometer aluminum oxide as an outermost layer, the volume expansion can be better and synergistically relieved on the premise that the porosity is not affected.