8results about How to "Efficient and stable preparation" patented technology

The invention provides a photovoltaic hybrid hydrogen production system and a capacity configuration optimization method. The system is formed by sequentially connecting a renewable energy power generation unit, an electrolytic hydrogen production unit and a hydrogen energy storage unit. Wherein the power generation unit outputs electric energy by means of a photovoltaic array; aLK and PEM are used in the water electrolysis hydrogen production unit, through cooperative coupling, the adaptability of the hydrogen production process to unstable solar power generation is enhanced, and efficient and stable preparation of green hydrogen under driving of fluctuating photovoltaic electric energy is enhanced. According to the invention, the two types of electrolytic cells are combined and researched, and the two types of electrolytic cells are combined for hydrogen production to form an electrolytic hydrogen production unit so as to give full play to respective advantages. And the economy of the whole hydrogen production system is improved by determining the optimal ratio of the two components in the system. And the prepared hydrogen can be conveyed to a user side or stored in a hydrogen storage tank through a high-pressure storage technology and the like, so that cross-regional transmission and utilization of renewable energy sources are realized.

The invention relates to a method for directly reducing micro-fine-particle iron powder from high-purity iron ore concentrate through hydrogen-based low-temperature fluidization, belongs to the technical field of mineral processing, and mainly relates to five stages of nitrogen replacement of air, preheating dehydration, low-temperature fluidization direct reduction, inert cooling and ore grinding screening. And fluidization direct reduction at the low temperature of 570-620 DEG C into metal iron powder is achieved, efficient ore grinding is conducted on the basis, and the micro-fine-particle iron powder with the particle size D50 smaller than or equal to 3 micrometers is prepared. Compared with a conventional 800-1400 DEG C high-temperature preparation process of the reduced iron powder, the energy consumption and the material consumption are greatly reduced, and meanwhile bonding and flow loss are effectively avoided. According to the technological method, H2 serves as reducing gas, fluidized roasting is adopted, and the technological method has the advantages of being simple in technological process, free of carbon emission, high in reduction efficiency and the like.

According to the large-scale electrolytic cell cluster rotation scheduling method and system, at the initial moment of rotation and the end moment of each rotation, alkaline electrolytic cells are sequenced according to the sequence of health state monitoring values of the alkaline electrolytic cells from large to small; all the proton exchange membrane electrolytic cells operate at rated power, in the current round value, when the electrolytic cell cluster is overloaded, the first, second,..., kth alkaline electrolytic cells in the sequence operate at overload power, and the (k + 1) th, (k + 2) th,..., nth alkaline electrolytic cells operate at rated power; when the electrolytic cell cluster is in a non-overload high-power working condition, the first, second,..., k alkaline electrolytic cells in the sequence run at rated power, and the (k + 1) th, (k + 2) th,..., n alkaline electrolytic cells stop running; and when the electrolytic cell cluster is in a non-overload low-power working condition, the first, second,..., kth alkaline electrolytic cells in the sequence run at the optimal power, and the (k + 1) th, (k + 2) th,..., nth alkaline electrolytic cells stop running, so that the stability of the electrolytic cell cluster is improved.

The invention relates to the technical field of bacterial cellulose preparation, in particular to a composite flora for producing bacterial cellulose and a preparation method thereof, and the preparation method comprises the following steps: screening gluconobacter oxydans, obtaining culture medium preparation materials and preparation tools, preparing a slant culture medium set, preparing an enriched liquid culture medium set, and preparing composite flora mixed inoculation liquid. The method comprises the following steps: preparing a waste tobacco leaf leaching solution, extracting a proportional leaching solution from the waste tobacco leaf leaching solution according to a preset proportion, obtaining a mixed fermentation culture medium based on a preparation tool and the proportional leaching solution, and carrying out inoculation operation on a composite flora mixed inoculation solution by using the mixed fermentation culture medium to obtain a dry cellulose membrane; calculating the yield of the bacterial cellulose based on the dry cellulose membrane, and completing the preparation of the composite flora for producing the bacterial cellulose based on the yield of the bacterial cellulose. The method can be used for scientifically, efficiently and stably preparing the composite flora.

The application discloses a method for preparing a two-dimensional ultracold atomic gas by optimizing adiabatic compression, and belongs to the technical field of ultracold atomic physics and optical lattice. The method takes the quantum adiabatic evolution of a three-dimensional ultracold atomic gas in an adjustable period optical lattice as a physical model basis, and equivalently describes the motion of atoms in the lattice bound direction as a one-dimensional quantum harmonic oscillator system varying with an external parameter. In the lattice compression process, the instantaneous energy level structure of the system evolves with time, and the minimum energy gap region between the lowest energy level and the first excited state is the main source of non-adiabatic transition. A non-adiabatic parameter is introduced to simultaneously describe the relationship between the instantaneous energy gap and the scanning rate of the parameter, which is used for quantitative evaluation of the adiabaticity of the system, and the Landau-Zener non-adiabatic transition model is combined to design and optimize the scanning curve of the lattice compression. The scheme can effectively reduce the probability of non-adiabatic excitation in the compression process, and significantly shorten the lattice compression time under the premise of ensuring the adiabatic evolution of the system.

The invention relates to ultrahigh-purity copper and a preparation method and application thereof, the preparation method comprises the following steps: (1) taking a copper raw material plate as an anode and a first electrode plate as a cathode, performing first electrolysis in an alkaline electrolyte, and forming cuprous oxide on the first electrode plate to obtain the first electrode plate containing cuprous oxide; and (2) transferring the first electrode plate containing cuprous oxide into an acidic electrolyte, carrying out second electrolysis in the acidic electrolyte by taking the first electrode plate containing cuprous oxide as an anode and a second electrode plate as a cathode, forming a copper plate on the second electrode plate, taking out the second electrode plate, and stripping the copper plate to obtain the ultra-high pure copper. According to the method, stable and efficient preparation of the ultra-high-purity copper is jointly promoted by utilizing the synergistic effect of the secondary electrolysis process under the alkaline and acidic conditions. The preparation method also has the characteristics of simple process, convenience in operation and low dependence degree of product purity on raw materials, and provides more regulation and control space for subsequent process upgrading.

The lipid nanoparticles manufacturing chip comprises a first raw material supply flow path, a second raw material supply flow path, and a mixer portion connected to the first raw material supply flow path and the second raw material supply flow path, and mixing a first raw material supplied through the first raw material supply flow path and a second raw material supplied through the second raw material supply flow path. The mixer portion comprises a first stabilizing unit, and a first mixing unit connected to the first stabilizing unit and mixing the first raw material and the second raw material with each other. Mixing of the first raw material and the second raw material is performed more in the first mixing unit than in the first stabilizing unit.

The invention relates to a preparation method of ultra-pure copper, which comprises the following steps: taking crude copper as a consumable anode, taking a titanium plate as an electrolytic cathode, isolating the outer side of the consumable anode from the cathode by using a double-layer diaphragm bag, and filling amorphous molybdenum oxide serving as an adsorbent between the double-layer diaphragm bag, and electrolyzing in an electrolyte containing hydrogen peroxide to obtain the ultra-pure copper. According to the method for preparing the high-purity copper by recycling and removing the Ag ions under the acidic condition, amorphous molybdenum oxide is used as an adsorbent, the adsorbent is placed in a double-layer diaphragm bag and can be conveniently recycled, and the method has the advantages of being short in technological process, easy to transform equipment, easy and convenient to operate and high in production benefit; according to the method, the ultra-high-purity copper can be stably and efficiently prepared, enrichment and removal of impurity silver ions can be achieved, the silver content of the produced ultra-high-purity copper can be stabilized to be 0.02 ppm or below through GD-MS detection, and green and sustainable development of industrial electrolytic copper is achieved.