68 results about "Nitrogen rich" patented technology

The invention belongs to the technical field of new materials, and particularly discloses nitrogen-rich activated carbon for soil mercury passivation and a preparation method and application thereof.The preparation method comprises the steps that dicyandiamide is subjected to a hydrothermal reaction to obtain a porous g-C3N4 precursor, then the porous g-C3N4 precursor and activated carbon are evenly mixed, and finally heat treatment is conducted to obtain the nitrogen-rich activated carbon. The prepared nitrogen-rich activated carbon can effectively remove dissolved mercury in a rice field. The cost is low, the preparation method is simple, and the prepared nitrogen-rich activated carbon is stable in structure, large in specific surface area, multiple in active sites and capable of effectively resisting interference of soluble organic matter and coexisting ions in soil, efficient fixation of biological available mercury in soil pore water is achieved, and generation of methyl mercury is reduced to the maximum extent.

The invention relates to the technical field of ceramic materials, and discloses a nitrogen-rich Si-Zr-N precursor, a nitrogen-rich amorphous SiZrN ceramic preparation method and a nitrogen-rich Si-Zr-N. The preparation method comprises the following steps: mixing perhydropolysilazane and tetrakis (dicarboxamide) zirconium, and then carrying out low-temperature liquid ammonia crosslinking and room-temperature ammonification to obtain the nitrogen-rich Si-Zr-N precursor. According to the preparation method of the nitrogen-rich amorphous SiZrN ceramic, high-temperature ammonolysis is carried out on a nitrogen-rich Si-Zr-N precursor, and the nitrogen-rich amorphous SiZrN ceramic is obtained. According to the invention, the nitrogen content of the precursor is increased through the molecular-level structure design, so that the formation of the high-nitrogen-ratio amorphous ceramic is facilitated; the pyrolysis path can be regulated and controlled, the product structure is compact, the components are uniform, and the problem of uneven mixing or incomplete reaction in the traditional method is avoided; the precursor is high in universality, is suitable for various processing and pyrolysis modes, and has good application expansibility; the cost is controllable and the method is environment-friendly.

The invention relates to nitrogen-rich hydrophobic porous biochar as well as a preparation method and application thereof. The nitrogen-rich hydrophobic porous carbon is provided with an amorphous multilayer region consisting of a plurality of graphene layers; wherein the nitrogen-rich hydrophobic porous carbon is derived from biomass, a nitrogen flame retardant and an oxidizing substance; in addition, the nitrogen content of the nitrogen-rich hydrophobic porous carbon is 5-15% by taking the total mass of the nitrogen-rich hydrophobic porous carbon as 100%. The nitrogen-rich hydrophobic porous biochar disclosed by the invention has relatively strong hydrophobicity and developed porous structures such as micropores and mesopores, and the surface of the biochar contains rich oxygen-containing and nitrogen-containing functional groups, so that the CO2 trapping capacity is greatly improved.

The invention discloses a preparation method and application of nitrogen-rich biochar, and relates to the technical field of water treatment. The invention aims to solve the problem that antibiotics and heavy metals are difficult to remove at the same time in the existing nitrogen-doped biochar. The method comprises the following steps: 1, cutting soybean straws, mixing the cut soybean straws with urea and distilled water to obtain a mixture, carrying out ultrasonic oscillation on the mixture, then transferring the mixture into a container, and drying the mixture in a drying oven to obtain urea-loaded straws; and 2, putting the obtained urea-loaded straw into a tubular furnace into which nitrogen is introduced for heating, then taking out the straw, grinding, sieving, mixing the sieved material with alkali liquor, activating, cleaning, finally putting the cleaned sample into a drying oven, and drying until the mass is constant, thereby obtaining the nitrogen-rich biochar. The nitrogen-rich biochar prepared by the invention can adsorb oxytetracycline (OTC) and Cu (II) at the same time.

The application relates to the technical field of refrigeration equipment, and discloses a refrigerator which comprises a cabinet, a drawer seat, an air-regulating film assembly and a suction pump, the cabinet is used for forming a low-temperature storage space; the drawer seat is arranged in the low-temperature storage space; the drawer body is internally limited by a storage cavity; the air-regulating film assembly is arranged in a mounting cavity located at the rear side of the drawer seat, the air-regulating film assembly comprises at least one layer of air-regulating film; the air suction port of the suction pump is communicated with the mounting cavity, under the suction of the suction pump, oxygen in air which is allowed to pass through by the air-regulating film is discharged, at least part of nitrogen in the air is blocked in the mounting cavity, the atmosphere of nitrogen-rich and oxygen-poor gas is reserved in the drawer seat, and the purpose of long-term preservation of fruits and vegetables is achieved. The air-regulating film assembly is arranged at the rear end of the drawer body, the oxygen removal effect on the inside of the drawer seat is guaranteed, the mounting space of the drawer seat in the vertical direction is effectively reduced, and the air-regulating preservation system is facilitated to be quickly maintained and replaced.

The application discloses a preparation method of an environment-friendly chitosan-based heavy metal adsorption air-precipitated bead, and comprises the following steps: preparing chitosan water-precipitated beads through acid-base neutralization solidification, loading the ammonia metal organic framework UiO-66-NH2 prepared through hydrothermal reaction on the chitosan water-precipitated beads through Schiff base reaction of a crosslinking agent, and then further loading polyethylene imine on the composite water-precipitated beads through the same loading means. The CS-UiO-GA-PEI-GA air-precipitated bead adsorbent is prepared through freeze-drying of the water-precipitated beads by a freeze dryer. The secondary crosslinking method gives the adsorbent certain mechanical strength, and provides a basis for regeneration and circulation of the adsorbent; the nitrogen-rich polyethylene imine and the high-porosity UiO-66-NH2 greatly enrich the active adsorption sites of the adsorbent, and significantly improve the adsorption capacity of the adsorbent for Cr(VI); and the removal rate of the adsorbent for Cr(VI) is up to 100% in the detection limit range of Cr(VI).

The invention discloses nitrogen-doped carbon aerogel and a preparation method and application thereof.The method comprises the steps that cobalt salt and nickel salt are added into a biomass solution and stirred to be dissolved, and a mixed solution containing metal ions is obtained; adding a nitrogen-rich organic matter into the mixed solution containing the metal ions, and continuously stirring to prepare a mixed solution containing the metal ions and the nitrogen-rich organic matter; the method comprises the following steps: adding a cross-linking aid into a mixed solution containing metal ions and nitrogen-rich organic matters, and stirring to form gel; after directional freezing is conducted on the gel, freeze drying is conducted, and doped precursor aerogel is prepared; and placing the doped precursor aerogel in an inert atmosphere, and carrying out heat treatment to prepare the nitrogen-doped carbon aerogel. According to the method, a multi-stage magnetic structure is constructed through in-situ reduction growth of magnetic nanowires and nanoparticles on a carbon skeleton in an in-situ growth method, and efficient dissipation of electromagnetic waves is performed through the synergistic effect of multi-dimensional magnetic loss of the nanowires and the nanoparticles and conductive loss and polarization loss of carbon aerogel.

The present invention belongs to the technical field of silk materials, and specifically relates to a method for preparing high-strength and fine-denier silk using nitrogen-rich hyperbranched molecules. The present invention adopts aromatic amine and acid to prepare nitrogen-rich hyperbranched molecules through a one-step hydrothermal method through polymerization reaction. The nitrogen-rich hyperbranched molecules prepared by the present invention will not cause harm to the growth and development of silkworms and the environment during the feeding and silkworm rearing process. The present invention continuously feeds silkworms with artificial feed containing nitrogen-rich hyperbranched molecules from the end of the fourth instar to the beginning of the fifth instar when silk protein is synthesized. Through the absorption of nitrogen-rich hyperbranched molecules by the silkworms, a large amount of nitrogen-rich hyperbranched molecules are present in the silkworms' bodies. During the synthesis of silk protein, the nitrogen-rich hyperbranched molecules are directly embedded in the silk protein, thereby achieving the purpose of preparing high-strength and fine-denier silk containing nitrogen-rich hyperbranched molecules.

The invention relates to the technical field of grain and oil by-product high-value utilization and food functional ingredient preparation, in particular to a nitrogen-rich mesoporous carbon-based cholesterol adsorption ingredient as well as a preparation method and application thereof. According to the method, soybean meal and rice bran are taken as a carbon source and an endogenous nitrogen source, and urea or melamine is compounded as an exogenous nitrogen-rich precursor, so that an internal-external synergistic nitrogen-rich system is constructed; the method comprises the following steps: compounding a zinc chloride or potassium hydroxide chemical activator with a ferric chloride catalytic graphitizing agent to form a nitrogen-rich-catalytic synergistic conversion system; the method comprises the steps of raw material pretreatment, nitrogen-rich slurry preparation, catalytic activation precursor preparation and the like. The prepared carbon-based ingredient has a developed mesoporous structure and high-content alkaline nitrogen-containing functional groups, and is large in cholesterol adsorption capacity and high in selectivity, and the raw materials are grain and oil processing byproducts, so that the cost is low, and the carbon-based ingredient is green and environment-friendly; the preparation process has the advantages of controllable parameters and good repeatability, is suitable for industrial production, and provides a new technical path for the development of functional food ingredients for reducing blood fat.

The invention relates to oxygen enrichment equipment and an oxygen enrichment process thereof, and relates to the technical field of jet propulsion devices.The oxygen enrichment equipment comprises an oxygen enrichment disc, an air inlet is formed in one axial side of the oxygen enrichment disc, and a plurality of rich nitrogen separation outlets are formed in the other axial side of the oxygen enrichment disc; a plurality of centrifugal separation flow channels are formed in the oxygen enrichment disc and are sequentially arranged at intervals in the circumferential direction of the air inlet, one end of each centrifugal separation flow channel in the length direction of the centrifugal separation flow channel communicates with the air inlet, and the other end of each centrifugal separation flow channel penetrates through the oxygen enrichment disc in the direction away from the air inlet; the rich nitrogen separation outlets and the centrifugal separation flow channels are arranged in a one-to-one correspondence manner, and the rich nitrogen separation outlets communicate with the corresponding centrifugal separation flow channels; the air suction fan is located in the air inlet, and the air suction fan is coaxially connected with the oxygen enrichment disc; and the driving end of the centrifugal driver is coaxially connected with the oxygen enrichment disc. According to the oxygen enrichment equipment, a mechanical rotary separation mode is adopted, other consumables are not introduced, the later maintenance cost of the oxygen enrichment fan is reduced, and the fault rate of the oxygen enrichment fan is reduced.

The application discloses a kind of microbial compound microbial inoculant and preparation method thereof, the microbial compound microbial inoculant includes microbial inoculum and its fermentation product and carrier;The microbial inoculum includes bacillus subtilis and bacillus licheniformis;The carrier is nitrogen-rich grafted biochar;The nitrogen-rich grafted biochar is prepared after grafting acrylic acid and modified monomer after being modified by nitrogen-rich biochar.The microbial compound microbial inoculant provided in the application can significantly improve the adsorption capacity and flocculation capacity of the microbial inoculant for particles in wastewater by compounding microbial inoculum with excellent flocculation capacity with charge-modified and adsorbed carrier to make microbial inoculant, thereby effectively reducing the content of COD components, ammonia nitrogen and total phosphorus in wastewater, and can be widely applied in the field of wastewater treatment.

This invention discloses a method for preparing high-nitrogen-content nitrogen-doped porous carbon with multiple nitrogen-rich units and its applications, belonging to the field of porous carbon materials. This invention uses a triazine containing a triyne group as the crosslinking center and a pyrazine containing a diazid group as the crosslinking arm. The two react via click chemistry to form a triazole structure, constructing a nitrogen-doped porous polymer with multiple nitrogen-rich units. The nitrogen content is controllable, high, and uniformly distributed, and the nitrogen-containing structure exhibits high stability, resulting in a higher residual nitrogen content after activation and carbonization, thereby improving the CO2 adsorption selectivity of the porous carbon. The nitrogen-doped porous polymer, through activation and carbonization, yields high-nitrogen-content nitrogen-doped porous carbon with multiple nitrogen-rich units, exhibiting high yield, adsorption capacity, selectivity, and reusability, and has broad application prospects in adsorption, catalysis, and membrane separation.

The application discloses a preparation method and application of a multi-level pore biomass activated carbon, and belongs to the technical field of activated carbon preparation. The method uses a mixture of nitrogen-rich agricultural and forestry wastes and industrial by-products as raw materials, optimizes a pretreatment process, innovates a composite activation system, and controls carbonization-activation parameters, so that a biomass-based activated carbon rich in nitrogen elements and having multi-level pores is prepared. The nitrogen elements in the raw materials can be used for nitrogen doping of the activated carbon in the carbonization-activation process. The application effectively solves the problems of low utilization rate of raw materials, single pores and the like in the existing activated carbon preparation process, solves the problem of difficult treatment of industrial by-products, simultaneously simplifies the preparation process of the nitrogen-rich activated carbon, has economic value and environmental protection benefits, and can be widely applied to the fields of water treatment, carbon capture and deep treatment of industrial wastewater and the like.

The application belongs to the field of engine cooling, and particularly relates to a dual-working fluid regenerative cooling system and method. The dual-working fluid regenerative cooling system comprises a dual-working fluid regenerative cooling module, an ammonia cracking product separation module and an energy comprehensive utilization module. The dual-working fluid regenerative cooling module comprises an ammonia supply device, a kerosene supply device and a double-layer regenerative cooling channel. The ammonia cracking product separation module comprises a membrane separator and a pressure swing adsorption unit. The energy comprehensive utilization module comprises a power generation device connected with the nitrogen-rich gas outlet. The application builds a closed-loop system integrating efficient thermal management, stable combustion and energy efficient utilization by means of ammonia and kerosene dual-working fluid cooling, ammonia cracking hydrogen production and nitrogen-rich gas power generation.

The invention discloses nitrogen-doped carbon nanotube array loaded magnetic carbon aerogel and a preparation method thereof.The method comprises the steps that cobalt salt and nickel salt are evenly dissolved in a biomass precursor aqueous solution, and a homogeneous solution is formed; adding a cross-linking aid to construct a three-dimensional network, and wrapping metal ions; performing freeze drying after directional freezing to form a directional porous structure; carrying out heat preservation and carbonization, converting the biomass into a porous carbon matrix, and reducing the cobalt / nickel salt into a uniformly embedded CoNi alloy; through two-stage heat treatment, the nitrogen-rich organic matter is decomposed to release a nitrogen source, and the vertical carbon nanotube array grows in situ. The material integrates CoNi alloy magnetic loss, carbon matrix dielectric loss and multistage structure scattering effect, realizes dielectric-electromagnetic cooperation, optimizes impedance matching, avoids strong surface reflection caused by high conductivity of a single carbon material, introduces polarization loss, widens an absorption frequency band, has excellent broadband efficient electromagnetic wave absorption performance, and is suitable for a complex electromagnetic environment.

The invention discloses a pyrazinyl nitrogen-rich hydrophobic porous organic cage material as well as a preparation method and application thereof, and belongs to the technical field of porous organic cage materials. Resorcinol calix [4] arene, pyrazine-2, 5-diamine, an organic solvent and the like react to obtain the pyrazinyl nitrogen-rich hydrophobic porous organic cage material. A nitrogen-rich pyrazine ring is introduced into the material to enhance the SF6 adsorption capacity; the introduction of isobutyl endows the material with strong hydrophobicity, so that the material keeps stable structure and unchanged adsorption performance under high humidity. The obtained material is good in water and chemical stability, the SF6 adsorption capacity reaches up to 53.6 cm < 3 > g <-1 > under the conditions of normal temperature and normal pressure of 25 DEG C and 1 bar, the adsorption capacity ratio of SF6 to nitrogen (N2) reaches 20.02 in a creative record, and the adsorption capacity ratio reaches the maximum value in all reported porous organic cage materials at present. The pyrazinyl nitrogen-rich hydrophobic porous organic cage material provided by the invention provides a new thought for efficient adsorption and separation of SF6.

The present application relates to the sewage treatment technical field, specifically relates to a kind of preparation and application in water purification bacteriostasis of nitrogen-rich carbide piezoelectric composite material.The present application is coupled by high molecular piezoelectric polymer and nitrogen-rich carbide, and modified piezoelectric composite material with high piezoelectric catalytic activity is formed, and the efficient degradation of various organic pollutants in water is realized by driving force induction piezoelectric effect, and has excellent bacteriostatic performance.The preparation process in the present application is simple, green, low cost, material mechanical strength is high, degradation process is free of secondary pollution, easy to mass production, the method can effectively solve water pollution problem, help ecological environment protection, and escort for human health.

The present application relates to a kind of methods for regulating the morphology of nitrogen-rich metal organic framework material using organic template agent, belong to the technical field of micro-nano material synthesis.The purpose of the present application is to solve the problems of single morphology, uneven particle size distribution and other problems of nitrogen-rich MOFs micro-nano particles obtained by the prior art, and to provide a method for regulating the morphology of nitrogen-rich metal organic framework material using organic template agent;By using organic template agent, the reaction solvent, reaction temperature and reaction time are controlled, the ratio of organic ligand, metal salt and organic template agent is controlled, so that the morphology and size of MOFs micro-nano particles are effectively controlled, and spherical, flower-like, snowflake-like, interpenetrating, cubic or sheet-like morphology can be obtained, with high yield, high repeatability, and morphology transformation of MOFs material is simultaneously controlled.

Title of the invention; Process for separating a mixture of CO2 and nitrogen by adsorption and by partial condensation and / or distillation and / or solidification. In a process for separating a mixture of CO2 and nitrogen by adsorption and by partial condensation and / or distillation and / or solidification, the mixture of CO2 and nitrogen is separated by adsorption forming a nitrogen-enriched and CO2-depleted gas stream (NRI) and a CO2-enriched and nitrogen-depleted gas stream. The nitrogen-enriched stream is heated by sending it to the bottom of a tower (T) fed at an inlet level above the outlet level of the nitrogen-enriched stream by a water stream (CWI). The CO2-enriched stream is separated by partial condensation and / or distillation and / or solidification to form a CO2-enriched stream, and a stream containing nitrogen and water vapor rising in the tower is heated by a heat exchanger (E).The heat exchanger is heated by a fluid flow (F1) which is itself heated by a heat source (I) generated by the separation process. Fig. 3,

Disclosed is a method for preparing a nitrogen-rich or nutritious straw-based slow-release fertilizer through In-Situ straw modification / reactive extrusion integrated continuous process. In the method, the liquid reaction precursor of a nitrogen-containing biodegradable slow-release fertilizer is mixed with crop straw to obtain a reaction mixture, or the liquid reaction precursor of a nitrogen-containing biodegradable slow-release fertilizer, crop straw and a soluble fertilizer are mixed to obtain a reaction mixture. The reaction mixture is subjected to extrusion in a screw extruder to produce the nitrogen-rich or nutritious straw-based slow-release fertilizer.

The application discloses a preparation method of six-element high-entropy single-atom nitrogen-rich porous photothermal material. In the solvent-free condition, 1h-123-triazole is introduced as one of raw materials, a six-element high-entropy single-atom nitrogen-rich photothermal material precursor is prepared through a mechanical ball milling method, then the six-element high-entropy single-atom nitrogen-rich photothermal material is obtained through washing, centrifugation, high-temperature annealing reaction and cooling at room temperature. The six-element high-entropy single-atom nitrogen-rich photothermal material precursor is obtained through an in-situ mechanical chemical preparation method, and 1h-123-triazole is added, so that nitrogen-nitrogen "explosion" caused by nitrogen-nitrogen double bond is generated in the later annealing process, and then the photothermal material with high porosity and high stability is obtained. The application is an effective method for preparing the porous photothermal material, which is simple and convenient in operation, green and safe, good in repeatability and high in efficiency.

This invention provides an immersion preservation method and preservation solution that maintain organs for transplantation in good condition for a longer period than conventional methods. [Solution] The present invention relates to a method for preserving organs for transplantation, which involves immersing the organs in a nitrogen-rich UW solution at a temperature suitable for immersion preservation, where the dissolved oxygen content is 1.0 mg / L or less and the nitrogen content is 90 mg / L or more at one atmosphere. As an example, a nitrogen-rich UW solution is prepared in which the dissolved oxygen content is 1.0 mg / L or less and the nitrogen content is 90 mg / L or more at one atmosphere and a temperature suitable for immersion preservation, and the organs for transplantation are immersed in the prepared nitrogen-rich UW solution. As another example, a nitrogen-rich UW solution is prepared in which the dissolved oxygen content is 1.0 mg / L or less and the nitrogen content is 90 mg / L or more at one atmosphere and room temperature, and the prepared nitrogen-rich UW solution is cooled to a temperature suitable for immersion preservation before the organs for transplantation are immersed in it.

The invention belongs to the technical field of biomass utilization, and particularly relates to a process for preparing nitrogen-rich anchored iron atom magnetic charcoal through low-temperature impregnation and application of the nitrogen-rich anchored iron atom magnetic charcoal in water pollutant adsorption. The method comprises the following steps: mixing biomass wastes with potassium hydroxide, and carrying out nitrogen-rich pyrolysis in ammonia gas and inert gas to form nitrogen-rich biochar. Dipping the nitrogen-rich biochar in a ferric trichloride solution, and finally, performing low-temperature drying, so that iron is firmly anchored on the surface of the biochar by a nitrogen functional group in a monatomic form. Different from a traditional high-temperature pyrolysis method that iron is converted into iron oxide at high temperature, it is ensured that part of iron is distributed in a monatomic form, and the bonding strength between iron and nitrogen and the interaction between the iron and nitrogen and pollutants are greatly improved. The nitrogen-rich anchored iron monatomic magnetic biochar has a developed pore structure and abundant surface functional groups, and can efficiently adsorb organic pollutants and the like in water. The method has the advantages of being short in preparation period, low in energy consumption, capable of being regenerated and recycled and the like, a new solution is provided for water pollutant treatment, and high-value utilization of biomass waste is achieved.

The invention belongs to the technical field of crystal porous material preparation and adsorption separation, and relates to a nitrogen-rich porous metal organic framework material, a preparation method and ethylene propylene adsorption separation application. The chemical formula of the nitrogen-rich metal organic framework material is [Ni6 (OH) 6 (APY) 3 (TCTA) 2], the composition and the structure of the nitrogen-rich metal organic framework material are novel, N atoms are densely distributed on the inner surface of the framework, the material has high porosity, the specific surface area of the material is 1975 m < 2 > / g, and the pore size distribution is 4.5-7.5. Due to permanent pore channels and high-density N atom distribution, the material is suitable for ethylene / propylene adsorption separation.

The invention relates to a method for cryogenic air separation and a corresponding device. The distillation system has a high-pressure column (12, 13), a low-pressure column (24, 25) and a main condenser (26) operating as a condenser-evaporator. In the nitrogen recycle, a nitrogen-rich gas (27) is withdrawn from the low-pressure column and used as a recycle fraction, which is compressed in a recycle compressor and introduced (34) into the high-pressure column (13) at a first intermediate height (H1). A nitrogen fraction (17) from a second intermediate height (H2) higher than the first intermediate height (H1) is withdrawn from the high-pressure column and recovered as a medium-pressure nitrogen product (18). The high-pressure column is divided into a first portion (12) and a second portion (13) placed in two closely spaced containers. The compressed recycle fraction (34) is introduced into the second portion (13), and the medium pressure nitrogen product (17, 18) is withdrawn from the second portion (13). A gaseous nitrogen transfer fraction (15) is withdrawn from the top of the first portion (12) and introduced into the second portion (13) at a third intermediate height (H3) higher than the second intermediate height (H2). The liquid nitrogen transfer fraction (39) is withdrawn from a fourth intermediate height (H4) of the second stage, wherein the fourth intermediate height (H4) is equal to or slightly higher than the third intermediate height (H3). The liquid nitrogen transfer fraction is introduced into the first section at the top of the first section. The gaseous fraction is separated from a two-phase fraction produced by partial condensation of the nitrogen-rich overhead gas in the main condenser and used as a He-Ne pre-concentrate intermediate.

The present invention discloses a method for efficiently denitrifying leather wastewater based on anaerobic ammonia oxidation technology, comprising the following steps: using leather wastewater pretreated by chemical coagulation as actual wastewater, and regulating the concentration of substrates in the actual wastewater, including ammonia nitrogen (70-210 mg·L ‑1 ), nitrite nitrogen (70~210mg·L ‑1 ) and chemical oxygen demand (0-300 mg L ‑1 ), then adopting a "leather wastewater-simulated wastewater-leather wastewater" model, operating an upflow anaerobic sludge blanket reactor in stages and continuously. This invention utilizes an ANAMMOX system to treat pretreated leather wastewater, achieving efficient denitrification and laying the foundation for expanding the application of ANAMMOX processes in treating nitrogen-rich organic wastewater.

The invention discloses a preparation method and application of nitrogen-rich biomass in-situ nitrogen-doped activated carbon, relates to the technical field of activated carbon, and aims to simplify the technological process and reduce the preparation cost. According to the preparation method, common biomass is used as a main carbon-containing precursor, and nitrogen-rich biomass is used as a nitrogen source and is placed on a bottom layer or a middle layer; in the pre-carbonization stage, cellulose, hemicellulose and the like are decomposed and carbonized preferentially, and a primary carbon layer with rich internal pore channels is constructed; in the subsequent carbonization stage, the protein and the lignin are subjected to synergistic pyrolysis, a large amount of nitrogen-containing volatile components are released, and the volatile components are captured and anchored during cross-linking with a carbon layer and the lignin in the diffusion, especially upward diffusion process, so that in-situ nitrogen doping is realized. According to the preparation method, the nitrogen element is more uniformly distributed in a carbon skeleton, the performance and the stability of the activated carbon are improved, chemical reagents do not need to be additionally added, the technological process is simplified, and the preparation cost is remarkably reduced.

This disclosure relates to a manufacture method of a bushing, a bushing and an excavator to alleviate the problems of insufficient lubricity and wear resistance of the bushing. The bushing includes an inner ring and an outer ring. The manufacture method of the bushing includes the following steps: grinding a first mixed powder containing Fe, Al, Ti, Cr and V, nitriding the ground first mixed powder to form a nitrogen-rich stable compound powder, and then carrying out molding by pressing and sintering the nitrogen-rich stable compound powder to form the outer ring; grinding a second mixed powder containing Fe and Mo, sulfurizing the ground second mixed powder to form a sulfurized powder containing FeS and MoS2, and carrying out molding by pressing the sulfurized powder to form the inner ring; and placing the inner ring in the outer ring and carrying out sintering to obtain the bushing.

The invention belongs to the field of engine cooling, and particularly relates to a double-working-medium regenerative cooling system and method. The double-working-medium regeneration cooling system comprises a double-working-medium regeneration cooling module, an ammonia cracking product separation module and an energy comprehensive utilization module. The double-working-medium regeneration cooling module comprises an ammonia supply device, a kerosene supply device and a double-layer regeneration cooling channel, the ammonia cracking product separation module comprises a membrane separator and a pressure swing adsorption unit, and the energy comprehensive utilization module comprises power generation equipment connected with the nitrogen-rich gas outlet. Through ammonia and kerosene double-working-medium cooling, ammonia cracking hydrogen production and nitrogen-rich gas power generation, a closed-loop system integrating efficient heat management, stable combustion and efficient energy utilization is constructed.

A system and method for removing nitrogen from a natural gas or liquefied natural gas stream. More specifically, a system and method for removing nitrogen from a natural gas feed stream using a twin column system in which the first column is operated at a pressure lower than the operating pressure of the second column. A first nitrogen-rich vapor stream from the first column is compressed and cooled, and then the resulting stream is directed to a second column that produces a second nitrogen-rich vapor stream and a second methane-rich liquid stream. Cooling in the system is provided in a heat exchanger that warms a first methane-rich liquid stream from the first column and a second methane-rich liquid stream from the second column.