318 results about "Partial pressure" patented technology

Flue gas is compressed to high pressures, which raises the partial pressure of carbon dioxide thus facilitating its absorption into physical solvents (e.g., water, salt solutions, methanol). When added onto an existing CO2-producing process, the compression is performed using multiple stages with intercooling. After the high-pressure carbon dioxide dissolves into the physical solvent, it flows through a series of pressure letdowns using turbines that allow the dissolved carbon dioxide to evolve from the solvent. Through a series of multiple compression stages, the evolved gas is compressed for transport, utilization, or storage. The flue gas that has been scrubbed of carbon dioxide flows through a series of expanders with interheating supplied from waste heat, or the heat of compression. The process is enhanced by employing alkalis that chemically react with acid gases, such as carbon dioxide. These same CO2-capture processes can be integrated into processes that produce shaft and / or electrical power.

The invention relates to a vehicle-mounted screw air compressor oil emulsification prevention method and system, a medium and a program product, and in the method, the running state parameters of a screw air compressor are monitored in real time, and a water vapor saturation pressure formula and a temperature and pressure coupling mathematical model are used for calculating saturation water vapor pressure and actual water vapor partial pressure respectively. When the actual water vapor partial pressure is larger than the saturated water vapor pressure force corrected by the safety coefficient, the system adjusts the oil way temperature control valve to reduce the lubricating oil flow of the oil cooler so as to increase the exhaust temperature. If the condensation risk still exists and the exhaust temperature does not reach the shutdown protection threshold value, the oil way temperature control valve continues to be adjusted; if the exhaust temperature reaches the shutdown protection threshold value, the actual water vapor partial pressure is reduced by reducing the rotating speed of the frequency converter. And after the condensation risk is eliminated, the current operation parameters are maintained. The method is used for reducing the possibility that water vapor reaches saturation in the compression system and liquid water is separated out, and the accuracy and stability of lubricating oil emulsification risk control of the air compressor under the variable load working condition are improved.

The invention discloses a numerical simulation method for oil product evaporation and oil gas concentration distribution prediction in a confined space, and belongs to the technical field of oil product evaporation simulation in the confined space, and the method specifically comprises the following steps: constructing an oil product evaporation multiphase flow model of the confined space; the Lee phase change model is improved through a user-defined function UDF, and the difference value between the vapor partial pressure and the saturated vapor pressure is dynamically calculated to trigger the evaporation process; performing CFD simulation on an oil and gas distribution rule in the confined space; performing comparison verification on the CFD simulation result and experimental data; and predicting the time-varying concentration gradient distribution rule of oil and gas in the limited space based on the Lee phase change model. According to the numerical simulation method for oil product evaporation and oil gas concentration distribution prediction in the limited space, the concentration gradient distribution rule of oil gas in the limited space can be accurately predicted, an important reference basis is provided for an oil product leakage emergency disposal strategy, and the prevention and control capacity and the emergency disposal efficiency of oil product leakage accidents can be improved.

The invention relates to the technical field of alloy smelting, in particular to a non-vacuum smelting preparation method of Mn-based alloy, which comprises the following steps: smelting a metal material and a covering agent to form a continuous slag layer, and obtaining a plurality of partial pressure ratios of furnace mouth escape gas and a vibration spectrum of a furnace body according to an initial detection period; determining whether the partial pressure ratio and the vibration spectrum meet oxidation judgment conditions and vibration judgment conditions or not; determining a melt state and a slag layer protection state on the basis of an oxidation judgment condition and a vibration judgment condition, adjusting input power and slag layer parameters on the basis of the slag layer protection state in combination with the partial pressure ratio, and adjusting the content of a deoxidizing agent in a pre-deoxidation procedure; and the risk that the final manganese yield is not within the target range is determined based on the risk grade judgment result, the final deoxidation degree and the standing duration are adjusted, the initial detection period is shortened, and the manganese-based alloy is prepared through pouring. The smelting parameters are adjusted by identifying the states of the melt and the slag layer and combining the manganese feedback efficiency, and the manganese yield of the manganese-based alloy smelted under the non-vacuum condition is increased.

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The invention relates to a liquid metal oxygen sensor reference electrode system and method with both precision and safety, which can provide stable oxygen partial pressure when a probe works normally and actively prevent harmful substances from leaking when the probe is damaged, so that the measurement precision of a liquid metal oxygen sensor is ensured, and the safety and the reliability are improved at the same time. Comprising a sensor, a gas micro-flow controller, a reference gas cylinder, an inert gas cylinder, a gas fan and a waste gas treatment system, the sensor is connected with a signal measuring instrument through a cable; the sensor is connected with a reference gas cylinder and an inert gas cylinder through a gas supply pipeline; the sensor is sequentially connected with a back pressure valve, a pressure measuring instrument, a gas component measuring instrument, a gas fan, a check valve and a waste gas treatment system through an exhaust pipeline. The long-term measurement accuracy and stability can be improved, and the system misoperation probability is reduced; meanwhile, the safety of the reference electrode powder is ensured.

The invention relates to the technical field of carbon dioxide capture, in particular to a method for rapidly evaluating the stability of a CO2 absorbent. The method comprises the following steps: putting 50-200g of an absorbent to be detected into a high-pressure reaction kettle, and enabling the absorbent to be detected to load a certain amount of CO2; nitrogen is opened, and purging is conducted for 2-5 min; oxygen is introduced, the pressure is increased to 0.5 MPa to 2 MPa, the temperature is increased to 80 DEG C to 150 DEG C, and meanwhile the rotating speed is adjusted to 300 rpm to 800 rpm; the change of the oxygen concentration in the reaction kettle along with time is monitored in real time, and the oxidative degradation resistance stability of the absorbent is evaluated by comparing the time required by the same oxygen reduction amount. According to the invention, an accelerated oxidation experiment system for simulating industrial harsh conditions is constructed, and through the synergistic effect of high temperature, high pressure and specific oxygen partial pressure, rapid evaluation of the stability of the absorbent is realized in a short time, and the problems of long period and high cost of a traditional absorbent stability experiment are solved.

A sorptive gas separation process employing a pre-concentration and purification process and systems thereof. Sorptive gas separation processes using partial pressure swing with a solid sorbent for separation of a target component from a multi-component gas stream are provided, along with systems thereof.

The invention provides a method for preparing alpha, omega-binary acid by decommissioning polyolefin cracking based on stage oxidation, which comprises the following steps: in the absence of a catalyst or in the presence of a catalyst, mixing decommissioning polyolefin with water to form a dispersion system, and reacting at the temperature of 100-200 DEG C and the partial pressure of oxidant gas of 0.1-5.0 MPa to prepare alpha, omega-binary acid. The method comprises the following steps: introducing oxidant gas into a high-pressure closed reactor, carrying out a stirring reaction to obtain small-molecular carboxylic acid, carrying out oxidation treatment on the small-molecular carboxylic acid by using nitric acid to obtain alpha, omega-dibasic acid with a carbon atom number of 4-10, and efficiently preparing high-purity alpha, omega-dibasic acid with a carbon atom number of 4-10. And [omega]-binary acid.

This invention belongs to the field of solid oxide fuel cell control and optimization technology, and particularly to a dual-input model predictive control method for solid oxide fuel cells with carbon deposition constraints. It includes the following steps: S1: Constructing a DIR-SOFC controlled object model with 11 state variables; S2: Solving for the optimal control increment through sequential quadratic programming; S3: Constructing a constraint system; S4: Introducing an adaptive setpoint for the output voltage that adjusts linearly with the load current density. The model dimension of this invention is expanded from the existing 3 states to 11 states, fully covering six gas phase partial pressures, bilinear coupling of carbon accumulation and catalyst activity, and three-zone thermal dynamics. The ODE white-box prediction engine accurately reflects MSR nonlinearity and positive feedback of carbon deposition. Compared with ARMAX black-box prediction, the error is reduced from approximately 3% to less than 0.8%, with an average single-step calculation time of 133ms, meeting the real-time constraint of a 1s sampling time.

This disclosure includes the following steps: (a) forming an oxide SiGe film on the first side and an oxide Si film on the second side by oxidizing a first side of the SiGe layer and a second side of the Si layer respectively using a gas containing free radicalized oxygen; and (b) selectively etching the oxide SiGe film using hydrogen fluoride or a mixture of hydrogen fluoride and an inactive gas while maintaining the temperature of the semiconductor substrate above TL (°C) and below TH (°C). When the atomic ratio of Ge to Si in the SiGe layer is set to C (%) and the pressure or partial pressure of hydrogen fluoride in step (b) is set to P (Pa), C (%) < 25%, 50Pa ≤ P (Pa) ≤ 1000Pa, TL = 11.3 × LN (P) + 0.23 × C - 97.4, TH = 13 × LN (P) + C - 102.

The present application provides a kind of for furfural refining device extraction oil recovery system, comprising: de-aldehyde tower A, de-aldehyde tower B, reagent pump, de-aldehyde tower top cooler and de-aldehyde tower top liquid separator, compared with prior art, the present application has the beneficial effects as follows: the double-tower design of de-aldehyde tower A and de-aldehyde tower B reduces the number of trays of each tower, which can reduce the tower pressure, reduce the partial pressure of furfural at the bottom of stripping tower, facilitate the separation of furfural and extraction oil;Second, it can adapt to different furfural content of extraction oil, when the furfural content in extraction oil is low, only de-aldehyde tower A can be used, when the furfural content in extraction oil is high, de-aldehyde tower A and de-aldehyde tower B can be used simultaneously, to improve the flexibility of the whole system, inject alkaline reagent before extraction oil enters stripping tower, remove acidic substances in extraction oil, make furfural more easily and extraction oil separate.

This invention discloses an online detection method and device for the interlayer vacuum degree of multi-layer insulation in cryogenic containers, belonging to the field of cryogenic insulation vacuum detection technology. The method includes: installing a vacuum-sealed base on the outer wall of the container; penetrating the outer liner with a piercing capillary probe and inserting it into the interlayer gap; constructing a two-stage high-vacuum differential system consisting of an oil-free dry forepump, a turbomolecular pump, a fine-tuning needle valve, a flow-limiting capillary, a differential chamber, and a residual gas analyzer to form a low-speed drainage loop; after pre-evacuating the background gas, adjusting the fine-tuning needle valve to extract the interlayer gas at low speed, simultaneously collecting the total pressure and component partial pressures; calculating the true vacuum degree by combining flow resistance, gas resistance, permeation resistance, and temperature correction; after detection, leaving the end of the piercing capillary probe inside the layer without removing it, and permanently sealing the base port; repeating the detection at different points and depths to complete a full-area scan. This application has the advantages of direct online detection, minimally invasive and leak-free operation, repeatable testing, and accurate tracing of failure causes.

The invention relates to the technical field of energy storage systems, and particularly discloses an air compression energy storage system coupled with a Carnot battery, which comprises a multi-stage air compression assembly, an electric heating oxygen release reactor, a compressed air storage device, a separator, an oxygen storage tank and a renewable power supply device, the multi-stage air compression assembly is used for performing multi-stage compression on air to obtain compressed air and water vapor; the electric heating oxygen release reactor is used for receiving the water vapor, so that an oxygen carrier in the electric heating oxygen release reactor is decomposed to obtain a reduced metal oxide and oxygen; the oxygen storage tank is connected with the separator; the renewable power supply device supplies power to the multi-stage air compression assembly; the separator and the compressed air storage device are both connected with the multi-stage air compression assembly, and water separated by the separator is used for recycling compression heat generated by the multi-stage air compression assembly in the compression process; according to the system, the balance partial pressure of the electric heating oxygen release reactor can be reduced by using steam, and the problem of difficult operation caused by low vacuum operation temperature of the electric heating oxygen release reactor is avoided.

The invention provides a gradient structure metal-oxide-non-oxide composite sliding plate and a preparation method, and relates to the technical field of sliding plate preparation within the steel smelting range. The outer layer of the gradient-structure metal-oxide-non-oxide composite sliding plate is a compact layer with the porosity smaller than or equal to 5%, the thickness ranges from 0.1 micrometer to 20 micrometers, and the phase composition of the gradient-structure metal-oxide-non-oxide composite sliding plate is Ti (C, N), (Al2OC) x (AlN) 1-x and corundum; the internal porosity of the gradient structure metal-oxide-non-oxide composite sliding plate is 10-20%, and the phase composition of the gradient structure metal-oxide-non-oxide composite sliding plate is Ti (C, N), (Al2OC) x (AlN) 1-x, Al-Ti alloy and corundum. The preparation of the metal-oxide-non-oxide refractory material with a compact surface layer structure is realized under the conditions of high temperature, nitrogen and low oxygen partial pressure by virtue of the regulation and control effect of TiO2 on a gas-phase mass transfer product and a material structure in a material sintering process; the method is simple and easy to operate, low in cost, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a low-partial-pressure CO2 catalytic absorption method and application, and belongs to the technical field of gas separation. The low-partial-pressure CO2 catalytic absorption method comprises the following steps: S1, providing a nitrogen-doped activated carbon catalyst; the nitrogen-doped activated carbon catalyst is prepared by taking activated carbon as a carbon source and modifying the activated carbon through a nitrogen-containing reagent; s2, providing an organic amine solvent; and S3, under the action of the nitrogen-doped activated carbon catalyst provided in the S1, enabling flue gas to react with the organic amine solvent provided in the S2. Compared with the existing CO2 absorption method, the method provided by the invention has the advantages that the CO2 absorption rate, the CO2 absorption capacity and the CO2 capture efficiency can be remarkably improved, so that low-cost CO2 capture is realized.

This application discloses a DC-resistant MnZn ferrite material, its preparation method, and its application. The DC-resistant MnZn ferrite material comprises: a main material of MnZn ferrite; a first additive, calculated as oxides by weight percentage of the main material, including 0.3 wt% Co₂O₃, 0.05 wt% ZrO₂, 0.03 wt% V₂O₅, and 0.15 wt% CaO; and a second additive, calculated as oxides by weight percentage of the main material, including 0.1–0.5 wt% YIG ferrite particles. The preparation method is an oxide ceramic method, where the green body is sintered in stages by controlling the temperature and oxygen partial pressure. The MnZn ferrite material of this application, through cobalt doping, YIG ferrite composite, and adjustment of the sintering process, exhibits excellent morphology and combines high magnetic permeability with superior DC-resistant properties.

This invention discloses a method for testing the oxygen partial pressure of a pressurized oxygen supply mask. The pressurized oxygen supply mask is placed inside a sealed container. The data cable of the oxygen partial pressure sensor on the pressurized oxygen supply mask passes through the sealed container in a sealed manner. A vacuuming device and an oxygen supply device are connected to the outside of the sealed container. A temperature sensor for monitoring the internal temperature is installed on the sealed container. The sealed container is first evacuated and then filled with oxygen. The theoretical value of the oxygen partial pressure inside the sealed container is then calculated, and the corresponding phase value output by the oxygen partial pressure sensor is recorded. Then, the theoretical values ​​and phase values ​​of the oxygen partial pressure at different temperatures are collected, and the data is fitted to calibrate the parameters relating the measured value and the phase value of the oxygen partial pressure sensor. These parameters are then written into the oxygen partial pressure sensor. Finally, the theoretical value of the oxygen partial pressure is compared with the measured value of the oxygen partial pressure sensor to verify the accuracy of the oxygen partial pressure sensor. This method can accurately test the accuracy of the oxygen partial pressure sensor on a pressurized oxygen supply mask.

The invention relates to the technical field of metal materials, and particularly discloses light-weight high-toughness medium manganese steel and a preparation method and application thereof. The method comprises the following steps: firstly, pre-oxidizing a hot rolled plate in a specific low oxygen partial pressure atmosphere, and forming a compact Al2O3-MnO composite oxide layer which is well combined with a matrix on the surface in situ; and then, in multi-pass warm rolling, synchronous plastic deformation of the oxide layer and the base body can be achieved, and interface stripping is avoided. And finally, in the circulating annealing process, a surface oxide layer serves as a diffusion barrier to inhibit Mn element leakage and enrich the Mn element towards the core, so that the heterogeneous structure with the continuous gradient characteristic is successfully constructed, specifically, the surface layer is superfine martensite, the transition area is an austenite-ferrite double-phase structure, and the core is Mn-rich coarse grain austenite. The gradient tissue enables the material to have high strength, high wear resistance and high plasticity at the same time, and is suitable for medical instruments with comprehensive requirements for mechanical properties, light weight and biocompatibility, such as knee joint tractor fixing braces.

To provide a more efficient etching method. [Solution] An etching method for a silicon-containing film, comprising: (1) providing a substrate having a silicon-containing film in a chamber; and (2) etching the silicon-containing film under plasma conditions using an etching gas containing hydrogen fluoride and a reaction accelerator, wherein the partial pressure of hydrogen fluoride in the etching gas is the largest.

The present application belongs to the technical field of carbon capture, and particularly relates to a method and system for reducing amine loss in the absorption process of carbon capture technology. The method comprises: (1) under the conditions of the presence of a catalyst and bubbling, performing first contact between acid gas and aqueous washing solution to obtain acidified water washing water containing micron-sized bubbles; (2) performing second contact between decarburized amine-containing purified gas and the acidified water washing water, the acidified water washing water absorbing the amine in the amine-containing purified gas to obtain amine-removed purified gas and water washing solution; and (3) dividing the water washing solution into two streams, one of which is subjected to regeneration treatment to obtain amine and is recovered, and the other of which is returned to the aqueous washing solution. The micron-sized bubbles and acid in the acidified water washing water are used to capture the amine-containing aerosol in the gas in the absorption section of the carbon dioxide absorption tower, and the partial pressure of the amine in the gas is reduced, thereby greatly reducing the amine loss in the absorption process of the carbon capture technology.

The application relates to the technical field of refractory material preparation, and particularly discloses an energy-saving segmented gradient low-temperature drying method for refractory materials and a control system thereof. The drying method comprises five sequentially connected continuous steps of system initialization, surface free water pre-removal, internal moisture diffusion strengthening, moisture content gradient buffer balance and deep dehydration standard reaching, the whole process takes the water vapor partial pressure difference as the core dehydration driving force, and a control mode of reverse linkage of cavity temperature and environmental absolute humidity is adopted. The control system matched with the drying method comprises a sensing layer, an execution layer and a PLC control layer, and is provided with a built-in double-closed-loop linkage control module, so that automatic closed-loop management and control of the whole drying process can be accurately realized. The application can be used for drying treatment of various industrial shaped and unshaped refractory material blanks, efficient dehydration can be realized in a low-temperature environment, the comprehensive energy consumption of drying is significantly reduced, defects such as blank crust and cracking are effectively avoided, and the product quality and batch stability are ensured.

A method and apparatus for evaporative cooling of materials within a vacuum chamber by maintaining a controlled partial pressure environment. The method involves sealing material inside a chamber, reducing the internal pressure using a vacuum pump, and simultaneously introducing external gas—such as ambient air, nitrogen, or inert gases—into the chamber. A constant partial pressure is maintained by balancing the gas input and vacuum pump operation, allowing for efficient evacuation of vaporized liquid without recondensation. The system can operate with either constant or variable flow rates for both gas input and vacuum pumping, depending on desired cooling conditions, chamber size, and material characteristics. The apparatus includes a sealable vacuum chamber, at least one external gas inlet, and a vacuum pump configured to sustain the target partial pressure.

The disclosure relates to a method for controlling carbonation synthesis of silicon and / or aluminium carbonate minerals, wherein the concentration of dissolved silicon and / or aluminium in a mix to be cured is adjusted to at least 1 mmol / 1 before curing the mix with gas comprising carbon dioxide (CO2) having a partial pressure of CO2 of at least 0.15 bar. In some embodiments of the disclosure an alkaline substance is added to the raw material to provide the mix where the total concentration of dissolved silicon and / or aluminium of at least 1 mmol / 1. The disclosure also relates to a product obtainable by the methods of the disclosure as well as to the use of the product as building material, preferably for producing concrete-like products, more preferably for elements, most preferably for pre-casted elements and to the use of the method in construction industry or for production of elements and / or pre-casted elements.

This invention relates to the field of special ceramics preparation technology, and discloses a process for preparing high thermal conductivity ceramic materials for high-nickel ternary cathode sintering, including: preparing magnesium aluminum spinel green blanks containing magnesium oxide, yttrium oxide and titanium oxide composite additives; performing cyclic variable oxygen pressure sintering at 1420℃ to 1480℃, controlling the furnace atmosphere to periodically switch between the first and second oxygen partial pressure states. This invention utilizes the oxygen potential difference to drive the grain boundary liquid phase to alternate between low viscosity wetting and high viscosity pinning characteristics, eliminating the rheological quiescent zone at the end of sintering, effectively suppressing abnormal grain growth while ensuring high material density, and improving the thermal conductivity and lithium erosion resistance of the ceramic sagger.

The invention discloses a flow detection device with environment temperature and humidity and gas concentration recognition, and relates to the pneumatic field, the flow detection device comprises a gas pipe partial pressure part and a gas flow monitoring part, the gas pipe partial pressure part comprises a gas flow pipeline and a partial pressure hole, the partial pressure hole is embedded in the center of the inner wall of the gas flow pipeline, the diameter range of the partial pressure hole is 2-6 mm, and the gas flow monitoring part is connected with the gas flow pipeline. The partial pressure hole is used for dissipating air flow in the air flow pipeline to the outside, the partial pressure hole is connected with the air flow monitoring part through a soft air pipe, and the soft air pipe is used for stably guiding dissipated air into the air flow monitoring part; through the design of the partial pressure hole of the partial pressure part of the gas pipe, the stable transmission of the soft gas pipe, the friction electric signal collection of the contact layer and the copper film, and the Bernoulli equation, the gas flow is calculated, the problem that the sensitivity of a traditional sensor is insufficient in the 10Pa extreme vacuum environment is solved, and the high-precision detection of trace gas flow in the vacuum environment is realized.

The present application aims to provide a lean water composite alkanolamine absorbent for low-concentration CO2 capture, belonging to the technical field of green carbon capture, which is a composite system of mixed alkanolamine-organic physical solvent-water. By regulating the types and proportions of the components, the water content of the system and the solvent regeneration energy consumption are significantly reduced while ensuring high CO2 absorption capacity. The water content of the absorbent is not higher than 20%, and it exhibits good absorption performance under low partial pressure CO2 conditions. The desorption regeneration energy consumption is about 77% lower than that of the same proportion alkanolamine high water content MEA system (MEA:EG:H2O=0.2:0:9.8). In the absorption-desorption cycle process, the absorbent exhibits good cycle stability, and its CO2 absorption performance does not significantly attenuate after multiple cycles. The lean water composite alkanolamine absorbent is suitable for low-concentration CO2 separation application scenarios such as direct air capture.

This invention relates to the field of carbon dioxide capture technology, and particularly to an apparatus and method for directly capturing carbon dioxide from the air and recovering the capture liquid. The invention utilizes a thin-layer moving bed to spray droplets of a lean capture liquid and achieve carbon dioxide capture through air convection. When the carbonate concentration in the capture liquid reaches a certain value, it is defined as a rich capture liquid. The lean capture liquid is recovered using an electrolytic process. A specific structure and connection relationship achieve good interaction, enabling efficient, rapid, low-energy, and controllable absorption of carbon dioxide from the air under low partial pressure (440–460 ppm). This achieves high-efficiency, large-scale carbon dioxide capture and allows for continuous production of high-purity hydrogen and carbon dioxide products. The capture liquid is reused, realizing an integrated capture and desorption system design. Using 0.5 MkOH as the lean capture liquid, a 600m³… 3 Under the condition of / h induced draft, it is converted into a rich liquid after 13h, and the average CO2 concentration at the outlet is 380ppm, which is 80ppm lower than the CO2 concentration in the inlet air.

The invention discloses a method and equipment for preparing a high-purity elementary substance by using a rotary kiln. The equipment comprises a rotary kiln body, wherein the rotary kiln body comprises a double-layer stainless steel shell and a lining aluminum oxide ceramic layer; the vacuum system comprises a roots pump and a molecular pump set; the electric heating system is a distributed silicon-molybdenum rod heater; the hydrogen supply system is provided with a mass flow meter; the control system integrates temperature, pressure and rotating speed PID linkage modules; the preparation method comprises the following steps: S1, charging; s2, vacuumizing is carried out; s3, gradient temperature rise; s4, dynamic hydrogen reduction: introducing hydrogen; the inert gas is quenched to 800 DEG C firstly, and then the inert gas is naturally cooled to the room temperature, and the method has the advantages that through cooperation of the oxygen partial pressure gradient and intelligent hydrogen injection, efficient reduction of oxide powder is achieved, energy consumption is reduced, gas waste is reduced through dynamic adjustment of the hydrogen flow (a mass flowmeter), and economical efficiency is improved.