324results about How to "Improve mass transfer efficiency" patented technology

The present invention discloses a filler washing tower and a washing method, the filler washing tower is used for washing treatment of VOCs waste gas, and the filler washing tower comprises: a washing liquid pipe which is arranged at the axis position of the washing tower in a penetrating manner, vertically extends and is used for receiving a washing liquid from the outside of the tower; the washing liquid pipe is provided with a rotatable pipe section at the corresponding position of the filler layer; the spraying pipe assembly is composed of a plurality of spraying pipes with different lengths and is communicated with the rotatable pipe section, and a spraying opening of each spraying pipe is formed in the tail end of the pipe; the spraying pipes are arranged at intervals in the circumferential direction of the rotatable pipe section and are tangent to the rotatable pipe section; the spraying pipes with different lengths drive the rotatable pipe section to rotate through counter-acting force when spraying out the washing liquid, and annular partition covering of the washing liquid on the packing layer is formed. Rotation of the spraying pipe is achieved through spraying of washing liquid, and through annular partition covering of spraying, water saving can be achieved while the gas-liquid mass transfer efficiency is guaranteed, and external power consumption is not needed.

The invention relates to a combined truncated cone type gas-liquid redistributor. The combined truncated cone type gas-liquid redistributor comprises a conical wall and a connecting bottom plate. Theconnecting bottom plate is fixedly arranged at the bottom of the conical wall, and is provided with a plurality of strip-shaped folding plates; the strip-shaped folding plates are of inverted-V structures; a plurality of air holes are formed at equal intervals in both sides of each strip-shaped folding plate; a stop plate is fixedly arranged on the lateral side of the strip-shaped folding plate above each air hole, and an angle is formed between each stop plate and the lateral side of the corresponding strip-shaped folding plate; the angles between the stop plates and the lateral sides of thestrip-shaped folding plates are proportional to the distances from the stop plates to the center of the connecting bottom plate. The combined truncated cone type gas-liquid redistributor has the advantages that the strip-shaped folding plates and the stop plates are adopted to achieve a good distribution effect of washing liquid, and accordingly, the area and time of contact between gases and liquid can be increased and prolonged; the included angles between the stop plates and the lateral sides of the strip-shaped folding plates are proportional to the distances from the stop plates to the center of the connecting bottom plate, so that the differences among the flowing speeds of gases from each air hole are small, the gas distribution effect is good, poor gas-liquid distribution in a packing tower is reduced, and the gas-liquid mass transfer efficiency is improved.

The invention discloses a wastewater degradation system and a wastewater degradation method based on cooperation of radial microchannel discharge and cavitation, and belongs to the technical field of organic wastewater treatment. The device comprises a waste liquid pool, a micro-channel discharge cavitation degradation device, an ozone generator, a Venturi tube and a collection pool, the Venturi tube is respectively communicated with the ozone generator, the waste liquid pool and a to-be-degraded wastewater inlet of the micro-channel discharge cavitation degradation device. A dielectric barrier discharge technology and a hydrodynamic cavitation technology are fused, a large number of active substances are generated in the inner and outer cavitation cavities through dielectric barrier discharge, a strong cavitation effect is generated around the rotor in cooperation with rotation of the cavitation rotor, and organic wastewater is degraded; by arranging the radial micro-channel discharge device, the discharge area is increased, the number of active substances such as ozone and hydroxyl radicals in gas and liquid phases is increased, and the inactivation loss of the active substances in the transportation process is reduced; and by arranging rotor cavitation teeth with opposite rotation directions, circular flow of a gas phase and a liquid phase is triggered, and the mass transfer efficiency is improved.

The invention discloses a method for preparing high-quality iron phosphate in a short process, and belongs to the field of battery material manufacturing. The method comprises the following steps: dissolving iron powder with phosphoric acid to prepare a ferrous phosphate solution, then transferring the solution into a pressurized reaction kettle, blowing high-speed oxygen to oxidize ferrous phosphate into ferric phosphate, adding ammonia water to control the pH value to be 1.5-2.0, and carrying out solid-liquid separation to obtain the water-containing amorphous ferric phosphate, after washing is finished, a water-containing material is fed into a muffle furnace to be subjected to stepped calcination, dehydration and crystal transformation are completed, and the alpha monoclinic system iron phosphate is obtained. The method provided by the invention is short in process flow and low in energy consumption, the oxidant is easy to obtain and safe, the particle size uniformity of reaction materials is good, and the prepared iron phosphate is uniform in particle size, regular in structure and stable in iron-phosphorus ratio and is a high-quality precursor material.

The invention discloses a thin-layer high-density filler which is prepared by combining an optimized weaving method, weaving density and a bundling mode on the basis of a plain woven wire mesh filler. The novel weaving method enables the weft number of the thin-layer high-density filler to be larger than that of plain woven wire mesh filler under the condition of the same warp number, and the thin-layer high-density filler has the characteristics of high specific surface area, high mass transfer efficiency, low flow pressure drop and the like. A large number of micropores exist on the surface of the thin-layer high-density filler, the wettability is extremely good, the transverse diffusion effect of liquid in the filler can be greatly enhanced due to the fact that the weft density is large, the performance is particularly outstanding in the processes of large-spraying-density rectification and the like, and the pressure drop is about 30%-50% lower than that of a common plain woven filler. The filler provided by the invention mostly adopts stainless steel wires as raw materials, and has the advantages of low cost, large flux, stable performance and low metal exudation rate, so that the filler is difficult to replace in the field of heat pump rectification, high-purity electronic chemical separation, intermediate separation and isomerism separation production.

The invention provides a preparation method of an MXene-based alkaline electrolytic water hydrogen production electrode. The preparation method comprises the following steps: 1, pretreatment of a base material: cleaning impurities on the base material, drying, and carrying out sand blasting roughening treatment; secondly, first metal powder and second metal powder are weighed and mixed according to a certain proportion to be guided into a powder mixing machine, vacuum drying is conducted after mixing treatment, third metal powder is prepared, the first metal powder is MAX phase powder, and the second metal powder is one or more of metal simple substances or alloys used for water electrolysis hydrogen production; thirdly, third metal powder is deposited on the surface of the pretreated base material through the plasma spraying technology, and a composite coating is obtained; 4, immersing the base material treated in the step 3 into an activation solution for activation; 5, after activation is finished, the base material is taken out and dried, and then the electrode is obtained.The method optimizes the conductivity and hydrophilicity of the electrode, and the diversity of the morphology of a plasma spraying electrode coating is improved.

The utility model discloses a coal gas purification tower device and relates to the technical field of purification treatment equipment. A water tank is arranged at the bottom end of the tower body, the water tank is communicated with the tower body, a filter screen is arranged between the water tank and the tower body, a circulating pump is mounted on the water tank, the water inlet end of the circulating pump is connected into the water tank through a pipeline, a steel water conveying pipe is mounted in the tower body through a bearing, and spray heads are distributed on the steel water conveying pipe; according to the coal gas purification tower device, a two-layer water distribution mode is adopted, rotary spraying is arranged, the spraying pipe automatically rotates in the water spraying process, water mist can be uniformly sprayed into the tower body, the spraying range can be expanded, all-directional coverage is achieved, spraying is free of dead angles, the contact area between gas and liquid is increased, the mass transfer efficiency is further improved, and the gas purification tower device is suitable for large-scale popularization and application. The purification efficiency of equipment can be improved, meanwhile, a cleaning liquid real-time circulating filtering system is arranged, the utilization efficiency of liquid is improved, the working efficiency is high, and the performance is stable and reliable.

The invention discloses a fluidized collision type bioelectric reaction device suitable for high-carbon sewage treatment. The device comprises a reactor body, a capacitive electroactive biofilm carrier, an anode plate and a cathode plate. The reactor body is a cylinder, the bottom of the reactor body is provided with a water impeller, and the areas are separated by grids; the capacitive electroactive biofilm carrier is a sphere formed by stacking round sheets and is made of polyethylene plated with an ITO (Indium Tin Oxide) film, and stainless steel spikes are arranged on the surface of the capacitive electroactive biofilm carrier; the cathode plate is made of graphite and is cylindrical; the anode plate is made of stainless steel compounded by lauryl sodium sulfate and graphene-multi-walled carbon nanotubes and is cylindrical, the plate wall is hollow, and the anode and the cathode are connected through a circuit. Electron transfer is completed through flowing and collision of the capacitive electroactive biofilm carrier, the mass transfer efficiency and activity of the electroactive biofilm are enhanced, the high-carbon wastewater treatment capacity is improved, and meanwhile the device has the advantages of being high in impact load resistance and low in site area requirement.

The invention discloses an organic extraction device for preparing an organic framework material, and relates to the technical field of extraction devices. Comprising an extraction tank, the extraction tank is provided with an upper feeding port, a lower feeding port, an upper discharging port and a lower discharging port, and fixing rings distributed in a linear array mode are installed in the extraction tank; the fixed shell is rotationally connected to the extraction tank; the plurality of first telescopic shells and the plurality of second telescopic shells are embedded in the fixed shell; the first turntable is in limited sliding connection with the fixed shell; and the second turntable is connected to the fixed shell in a limiting and sliding manner. By detecting the concentration of an organic component in a stock solution, when the concentration of the organic component is increased, the distance between the first turntable and the second turntable and the fixed ring is reduced, so that the flow area of liquid in the extraction tank is reduced, a higher shearing force is generated when the solution flows, the dispersion degree of liquid drops of the solution is increased, and the extraction efficiency is improved. The mixing speed of the stock solution and the extractant is accelerated, and the mass transfer efficiency is improved.

The invention discloses a self-gas-stirring partition plate type efficient anaerobic bioreactor and a method, and belongs to the field of nitrogen and sulfur-containing organic wastewater biological treatment devices. The reactor sequentially comprises a first reaction zone, a second reaction zone, a third reaction zone and a three-phase separation zone which are communicated with one another from bottom to top. Anaerobic granular sludge is inoculated in the first reaction zone for hydrolytic acidification reaction; anaerobic activated sludge with denitrification and sulfate reduction functions is inoculated in the second reaction area, and nitrate and sulfate reduction reaction is carried out. Anaerobic activated sludge with a methanogenesis function is inoculated in the third reaction area, and a methanogenesis reaction is carried out. The three reaction zones are separated by ecological partition plates to ensure water and air permeability and no mud permeability. According to the reactor, the ecological partition plates are arranged to realize anaerobic reaction function division, and multiple components in complex organic wastewater are synergistically removed, so that the pollutant removal efficiency is improved; the flow state in the reactor is improved through self-produced gas backflow, the mass transfer and detoxification effects are enhanced, and the decontamination effect and stability of the reactor are improved.

The invention discloses a treatment method for synchronously removing ammonia nitrogen and organic matters in biogas slurry, which comprises the following steps: the biogas slurry is subjected to electrochemical treatment and ultraviolet radiation treatment at the same time, the anode adopted in the electrochemical treatment comprises a ruthenium iridium titanium electrode, and the cathode comprises an iron-doped modified carbon felt electrode. The preparation method of the iron-doped modified carbon felt electrode comprises the following steps: a, carrying out ultrasonic cleaning on a carbon felt; b, the cleaned carbon felt is soaked in acid liquor to be activated; c, dipping the activated carbon felt in a polytetrafluoroethylene solution; d, coating one side of the carbon felt treated in the step c with a solution containing carbon powder and polytetrafluoroethylene, and drying to obtain a carbon felt containing a catalyst layer; and e, dropwise adding an iron-containing precursor solution onto the carbon felt catalyst layer, and calcining to obtain the iron-doped modified carbon felt electrode. The treatment method provided by the invention realizes in-situ generation and activation of hydrogen peroxide, enhances removal of organic pollutants, reduces consumption of active chlorine by organic matters, and realizes synchronous removal of ammonia nitrogen and organic matters in the biogas slurry.

The invention relates to the field of electrochemical energy storage, and discloses a vanadium redox flow battery stack optimization and performance prediction method, which comprises the following steps: constructing a high-precision reaction kinetic model, and accurately describing the kinetic behavior of an electrode reaction based on a multi-step reaction mechanism, a surface adsorption-desorption process and heterogeneous surface reaction distribution; based on the output of the reaction kinetic model, constructing a multi-physical field coupling model, including ion mass transfer, fluid dynamics and heat transfer models, to cooperatively simulate the ion concentration, fluid flow and temperature field distribution in the galvanic pile; and based on the state variables of the multi-physics field coupling model, constructing a dynamic prediction model of chemical reaction-heat-fluid coupling, and predicting the future performance of the galvanic pile in real time through a long and short term memory network model. According to the method, the energy efficiency, the power density and the service life of the vanadium redox flow battery can be improved, and support is provided for intelligent management and optimization of the vanadium redox flow battery.

The invention discloses a semi-coke tail gas chemical looping hydrogen production system which is characterized in that a first gas inlet chamber and a second gas inlet chamber are arranged in the hydrogen production system, and a reaction tube comprises a first reaction chamber and a second reaction chamber; the gas inlet of the first reaction chamber is communicated with the gas inlet of the second reaction chamber; the air outlet of the first reaction chamber is communicated with the air outlet of the second reaction chamber, so that the first reaction chamber and the second reaction chamber can supply air independently, the air speed in the first air inlet chamber is higher than that in the second reaction chamber, internal airflow circulation is effectively formed in the internal circulating fluidized bed, the reaction process is more sufficient, and the reaction efficiency is improved. The device effectively improves the hydrogen production efficiency, is simple in structure, realizes the independent air supply process through the independent design of the two cavities of the gas inlet pipe and the reaction pipe, realizes the effective circular reaction of tail gas in the reaction pipe through the control of the air speed, and improves the conversion efficiency.

The low-temperature power type lithium ion battery comprises the positive pole piece, a negative pole piece, an electrolyte and a diaphragm, positive electrode slurry of the positive electrode plate comprises the following components in percentage by weight: 95%-97.5% of a positive electrode active material, 1.5%-3% of a positive electrode conductive agent and 1%-2% of a positive electrode binder; the positive pole piece is prepared by dispersing the components in an N-methyl pyrrolidone solvent and performing wet blade coating; the positive electrode active material is a nickel cobalt lithium manganate ternary material, the particle size distribution D50 of the positive electrode active material is 3.0-3.5 m, and the specific surface area of the positive electrode active material is 1.5-2.0 m < 2 > / g; the positive electrode conductive agent is composed of conductive graphite and carbon nanotubes, and the weight percentage of the conductive graphite is 50-70%; the positive electrode binder is polyvinylidene fluoride; the low-temperature performance of the positive electrode material is effectively improved.

The invention discloses an application of cobalt-loaded nitrogen-doped hollow carbon spheres in hydrodechlorination of electric catalytic florfenicol. According to the invention, cobalt is loaded on nitrogen-doped hollow carbon spheres to obtain cobalt-loaded nitrogen-doped hollow carbon spheres (Co / N-HCS). The cobalt-loaded nitrogen-doped hollow carbon spheres (Co / N-HCS) can efficiently remove carbon-chlorine bonds in antibiotic florfenicol molecules, and show very high florfenicol degradation rate and dechlorination rate.

The invention relates to the technical field of preparation of hexagonal boron nitride ceramic materials, in particular to a preparation method of a hexagonal boron nitride-based ceramic crucible. The hexagonal boron nitride combined crucible with adjustable porosity and low volatile matter content is prepared by a method of ball milling, hot pressed sintering, machining and heat treatment, so that the purposes of adjusting the porosity rate and improving the mechanical property of the hexagonal boron nitride ceramic material are achieved. After the blank material is prepared, the hexagonal boron nitride crucible with the required specification can be directly prepared by adopting a linear cutting and machining method according to the specification or requirement of the actually used crucible. The porosity-adjustable hexagonal boron nitride combined crucible solves the problem that the service life of an existing crucible prepared from pure hexagonal boron nitride ceramic is short due to low material strength.

The invention discloses an electrochemical system and method for treating nitrogen-containing organic wastewater based on a double-sided cathode. The electrochemical system comprises a reactor, an aeration device, a power supply, an anode and the double-sided cathode, and the double-sided cathode is prepared by loading a functional catalyst through a double-sided rolling coating process. Under the condition of not adding exogenous iron ions and H2O2, the side, with the electro-catalytic degradation function, in the double-sided cathode generates. OH in situ through the oxygen reduction reaction of two electrons and the electro-Fenton process, so that efficient degradation of organic pollutants is realized; meanwhile, NO3 <-> can be converted into N2 to be discharged under the synergistic effect of the sides, with the denitrification function, of the DSA and the double-sided cathode, organic pollutants and total nitrogen are synchronously removed, the denitrification function and the electrocatalytic degradation function are integrated in the single cathode, the device is more compact and efficient, the current efficiency and the mass transfer efficiency are improved, and the device is suitable for large-scale popularization and application. The complexity and the occupied area of the system are reduced, and the energy consumption and the operation cost are reduced.

The invention relates to a pre-fermentation method for improving biogas production of straws and a biogas production fermentation system. The pre-fermentation method comprises the following steps: S1, preparing a mixed microbial agent to be fermented; the mixed microbial agent is prepared by inoculating the following zymophyte in parts by weight into a fermentation culture medium according to the total inoculation amount of 3-10% (v / v): 5-50 parts of bacillus subtilis, 10-20 parts of white-rot fungi, 5-10 parts of aspergillus oryzae, 5-10 parts of trametes versicolor and 5-10 parts of trichoderma viride; s2, uniformly mixing the mixed microbial agent with the micro-nano bubble water, and fermenting to form an enhanced hydrolysis bacterium solution containing a microbial agent fermentation solution and an enzyme solution; s3, spraying enhanced hydrolysis bacteria liquid onto the straws for enhanced hydrolysis so as to complete pretreatment before fermentation and biogas production; wherein the volume of the reinforced hydrolytic bacteria liquid required by each kg of straw is 3-5L. Compared with the prior art, the mixed microbial agent and the micro-nano bubble water are used for carrying out cooperative treatment on the straw, so that the gas production efficiency and the methane production amount of the straw can be effectively improved.

The invention discloses a high-shear dynamic mixing reaction device for preparing flexible particles and a dynamic treatment process, and relates to the technical field of preparation of battery raw materials, and the process is characterized in that a flexible particle material for a battery is prepared in a compact space by adopting a pulsating stress dynamic processing method on the basis of an existing chemical formula. Performance obtained by a material formula and performance obtained by pulsating stress dynamic processing are mutually complemented to form an organic whole, the reaction device comprises a barrel, a feeding port is formed in the top of the barrel, a discharging port is formed in the bottom of the barrel, and a kneading and turning mixing mechanism is arranged, rotation of a stirring shaft is used as driving force of a sliding block, so that the material formula and the pulsating stress dynamic processing are combined, and the material formula and the pulsating stress dynamic processing are combined. The sliding block slides in the fixed sleeve in a reciprocating mode, upward and downward pressure is provided for materials in the barrel, the triangular fins are arranged on the baffles in a matched mode, the tips of the triangular fins can provide better shearing force for material particles rotating moderately, the materials are continuously kneaded and turned over and tend to be round, and carbon coating can be more uniform.

The invention relates to a fluorine-based three-dimensional covalent organic framework material as well as a preparation method and application thereof, and belongs to the technical field of covalent organic framework materials. Under the action of a catalyst, a first monomer (the first monomer is selected from a regular tetrahedron-containing amino monomer or a regular tetrahedron-containing aldehyde group monomer) and a second monomer (the second monomer is selected from a fluorine-containing aldehyde group monomer or a fluorine-containing amino monomer) are subjected to a condensation reaction in an organic solvent to obtain the fluorine-based three-dimensional covalent organic framework material. The method comprises the following steps of: preparing a solid-phase microextraction probe by taking the perfluorinated compound as an adsorbent through in-situ growth on the surface of a probe matrix, and then combining the solid-phase microextraction probe with an open-type mass spectrum to detect trace perfluorinated compounds in a complex matrix. The fluorine-based three-dimensional covalent organic framework material disclosed by the invention is good in chemical stability and high in hydrophobicity, has a good adsorption effect on perfluorinated compounds, and is high in repeated utilization rate.

The invention discloses an air-lift integrated device based on an anaerobic ammonia oxidation process, and relates to the technical field of sewage treatment, the air-lift integrated device comprises a reaction container, the top of the reaction container is provided with a top cover, a stirring mechanism is arranged above the top cover, and the outer surface of the reaction container is fixedly provided with a water pump 1. By arranging the aeration assembly, gas can escape in the form of tiny bubbles, the gas-liquid contact area is greatly increased, by arranging the stirring mechanism, the bubbles generated by the aeration assembly can be further crushed and dispersed, meanwhile, the bubbles can be guided to spirally rise in the reaction container, and the gas-liquid separation effect is improved. The aeration assembly and the stirring mechanism are matched for use, so that the contact time of bubbles and liquid can be remarkably prolonged, the oxygen transmission efficiency is greatly improved, anaerobic ammonia oxidizing bacteria can take in oxygen more sufficiently to react with a substrate, and the sewage denitrification treatment efficiency and quality can be effectively improved; and the treated sewage is ensured to be stably discharged up to the standard.

The invention relates to the technical field of gas-liquid treatment, and discloses a carbon dioxide trapping and wastewater recycling treatment method based on a cavitation air flotation method, which comprises the following steps: S1, flue gas of a blast furnace and a hot blast stove in an iron and steel plant is communicated with an air inlet of a cavitation air flotation fan blade through a flue gas channel, and the fan blade rapidly rotates to generate a negative pressure environment underwater; the method comprises the following steps: (1) adding a liquid into a cavitation air floatation tank, enabling flue gas to enter the liquid through fan blades, and dispersing the flue gas through the fan blades to form microbubbles, (2) injecting whole-plant comprehensive wastewater containing calcium and / or magnesium ions in a steel plant into the cavitation air floatation tank, and enabling carbon dioxide in the flue gas to react with the calcium and magnesium ions in the wastewater to form precipitates; according to the method, a brand new thought is provided, the wastewater and the flue gas of the steel mill are subjected to economic cooperative treatment, and compared with a traditional flue gas treatment method, the method provided by the invention has the advantages that the process of carbon dioxide absorption and wastewater treatment is more simplified, the mass transfer efficiency is enhanced, and meanwhile, the difficulty of collection after precipitation of calcium and magnesium ions in water is reduced.

The invention discloses a two-dimensional Co-Fe Prussian blue analogue catalytic membrane as well as a preparation method and application thereof, and belongs to the technical field of catalytic membrane degradation treatment of environmental organic pollutants. The two-dimensional Co Fe PBA nanosheets are fixed to the hydrophilic polytetrafluoroethylene membrane modified by polydopamine in a vacuum filtration mode, the stability of the material is improved, the leaching rate of metal ions of the Co Fe PBA nanosheets is reduced, and the two-dimensional flaky Prussian blue analogue catalytic membrane is promoted to activate PAA to catalyze organic pollutants. The prepared two-dimensional flaky Prussian blue analogue catalytic membrane can treat different organic pollutants, is high in structure and performance stability and wide in pH application range, has high tolerance to complex water bodies, can be expected to be applied to continuous and efficient treatment of actual water bodies, and has wide application prospects. And new opinions and possibilities are provided for the treatment of environmental pollutants.

The invention relates to the technical field of wastewater treatment, and discloses a concrete member environment-friendly production wastewater treatment device and method.The concrete member environment-friendly production wastewater treatment device comprises a treatment box, a feeding port and a drainage port, the feeding port and the drainage port are formed in the top end and the bottom end of the treatment box, and a stirring structure is arranged in the treatment box and driven by a motor; two oil absorption devices for absorbing grease are mounted at the top of the treatment box and are driven by a driving stirring structure. Air is blown into the treatment box through interaction of the magnetic piston and the magnetic fan and action of the magnetic piston and the inflation system, the air is divided into two parts, one part is guided into wastewater, decomposition of organic matter is accelerated, grease is driven to float upwards, the wastewater treatment efficiency is improved, the other part of air flows on the surface of the wastewater, and the wastewater treatment effect is improved. Air flow is accelerated, and foam generation is reduced.

The invention discloses a tubular double-membrane ammonia nitrogen removal and recovery device. The device comprises a shell, a cation exchange membrane and a hollow fiber hydrophobic membrane which are sequentially arranged from outside to inside, a wastewater inlet chamber is formed between the shell and the cation exchange membrane; a driving chamber is formed between the cation exchange membrane and the hollow fiber hydrophobic membrane; a recovery chamber is formed in the hollow fiber hydrophobic membrane; the hollow fiber hydrophobic membrane comprises a plurality of bunchy hollow membrane filaments, and a regulation and control device for adjusting the opening degree is arranged corresponding to an acid liquor inlet of the hollow fiber hydrophobic membrane, so that the number of the membrane filaments participating in acid liquor contact work can be adjusted. Due to the fact that the number of the membrane filaments is adjustable, waste of acid liquor and pollution of the membrane filaments are greatly reduced, meanwhile, due to the fact that the multiple membrane filaments are arranged, efficient mass transfer of ammonia gas is achieved, and the decontamination capacity and the recovery efficiency of the whole device are improved. In addition, due to the reasonable arrangement of the electric driving assembly, composite driving of an electric field and a concentration field can be formed, and then high-concentration ammonia-nitrogen wastewater is effectively treated.

The invention discloses an efficient low-carbon vertical tank supergravity mixed magnesium smelting device and method.The device comprises a furnace body and a supergravity solid-liquid mixing system, and the supergravity solid-liquid mixing system comprises a first-stage material gathering taper pipe fixedly arranged in the furnace body and a second-stage material gathering taper pipe provided with a discharging port; a liquid-solid mixing reaction material tank internally and fixedly connected with a solid raw material distributing plate is arranged above the first-stage material gathering taper pipe, the liquid-solid mixing reaction material tank is fixedly connected with a solid raw material feeding pipe provided with a solid raw material feeding vacuum valve, and the solid raw material feeding pipe is rotationally connected with the furnace body and connected with a transmission assembly. A liquid-state reducing agent atomizing disc is fixedly arranged in the liquid-solid mixing reaction material tank and is rotationally connected with a liquid-state reducing agent feeding pipe provided with a liquid-state reducing agent feeding vacuum valve; the furnace body is connected with the magnesium steam collecting system, the magnesium steam collecting system is connected with the vacuumizing system, and a slag outlet is formed in the bottom of the furnace body and connected with a sealing piece. According to the invention, the reaction efficiency is improved, the energy consumption is reduced, and energy conservation and emission reduction are realized.

The utility model relates to the technical field of waste gas treatment, in particular to a tail gas absorption device in a desulfurization waste liquid salt extraction process, which comprises a collecting tower, a spraying system and a filler layer, the filler layer is arranged below a spraying pipe and comprises a filler supporting grating and a Pall ring, and the Pall ring is arranged in the collecting tower. The packing supporting grid is horizontally and fixedly installed inside the collecting tower, the Pall ring is flatly laid above the packing supporting grid and comprises an outer ring and an inner ring, the outer ring is flexibly arranged, the inner ring is rigidly arranged and is inserted into the outer ring, the inner ring and the outer ring are arranged in an interference fit mode, and the outer ring is fixedly connected with the Pall ring. By improving the structure of the Pall ring, the rigidity of the Pall ring is improved, an original PP Pall ring is replaced, and the Pall ring is applied to a spraying device for tail gas absorption, so that the problem that the mass transfer efficiency is reduced due to deformation of the Pall ring is solved, liquid in a tail gas absorption device is fully mixed with acidic or alkaline gas in tail gas, and the absorption efficiency is enhanced.

The invention discloses a microbial fuel cell with a conductive dynamic membrane separator and application of the microbial fuel cell. The microbial fuel cell comprises a reaction chamber, a conductive dynamic membrane separator is arranged in the reaction chamber, the conductive dynamic membrane separator divides the reaction chamber into a cathode chamber and an anode chamber, and the conductive dynamic membrane separator is electrically connected with the cathode chamber or the anode chamber; the conductive dynamic membrane separator sequentially comprises a dynamic membrane, a metal power collection net and an oxygen isolation layer from inside to outside, the dynamic membrane comprises a frame material and a basement membrane, the frame material is used for supporting the basement membrane, and the basement membrane is made of a conductive porous material. The metal power collection net serves as a framework, the supporting function is achieved, and the power collection function is achieved. The ingenious design of the fuel cell structure in the scheme of the invention not only significantly improves the effluent quality and the oxygen isolation effect, but also reduces the manufacturing cost of the exchange membrane, and shows wide application potential in the fields of sewage treatment and reclaimed water reuse.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The invention relates to the technical field of oxygen reduction catalysts, in particular to a transition metal-based triatomic oxygen reduction catalyst and a preparation method and application thereof. The invention relates to a preparation method of a transition metal-based triatomic oxygen reduction catalyst. The preparation method comprises the following steps: dispersing carbon nanotubes in a solvent to obtain a dispersion liquid; adding transition metal acetate, urea and 4, 4 '-dihydroxy [1, 1'-biphenyl]-3, 3 ', 5, 5'-tetracarboxaldehyde into the dispersion liquid, performing ultrasonic treatment to obtain mixed liquid, and then performing heating reaction in an inert atmosphere; and after the reaction is finished, naturally cooling to room temperature, filtering, washing and drying to obtain the transition metal-based triatomic oxygen reduction catalyst. The catalyst designed by the invention not only has an efficient catalytic active site, but also remarkably improves the material transmission efficiency and enhances the utilization rate of a catalytic active center by optimizing the structure of a composite material, so that the synergistic enhancement of the electro-catalytic performance is realized.