891 results about "Oxygen enrichment" patented technology

The invention discloses a local space oxygen enrichment control system and method based on an oxygen selective permeable membrane, belongs to the technical field of air purification, environment control and membrane separation, and aims to solve the problems that the indoor oxygen concentration cannot be actively and efficiently increased and compact integration is difficult in the prior art. The system integrates an outdoor fresh air fan, a switching valve, an oxygen enrichment membrane device, an air pump, an indoor air return and supply fan, a gas monitoring control unit, an outdoor exhaust fan and the like, and a control unit dynamically regulates and controls a switching valve passage, the rotating speed of each fan and start and stop of the air pump according to the difference between oxygen sensor data and preset target oxygen concentration; air selectively passes through the oxygen-enriched membrane device to generate oxygen-enriched air or is fed into a room through a bypass air path, and the indoor oxygen concentration is actively stabilized at 21%-26%. The system is suitable for local spaces such as residences and offices, active oxygen enrichment and environment control can be achieved, the air quality is improved, and meanwhile low energy consumption, safety and comfort are taken into account.

The embodiment of the invention discloses a fly ash coal oxygen-enriched melting intelligent control method based on multi-mode coupling prediction, and belongs to the technical field of solid waste recycling and intelligent control crossing. The method comprises the steps that S101, multi-source data collected by a sensor is obtained; step S102, obtaining control parameters through an intelligent control algorithm according to the multi-source data; s103, according to the control parameters, controlling an oxygen-enriched spray gun, a slurry outlet and a material ratio; wherein the step S102 comprises the sub-steps of performing decoupling prediction on the temperature T, the hearth negative pressure P, the flue gas oxygen concentration CO and the molten slurry yield Qp by adopting a multivariable decoupling prediction model; carrying out fuzzy control on the hearth negative pressure P by adopting a fuzzy self-adaptive PID (Proportion Integration Differentiation) controller; and a multi-objective optimization algorithm is adopted to calculate and obtain control parameters. The control method is small in melting temperature fluctuation, high in hearth negative pressure stability, high in quartz sand utilization rate, low in energy consumption per ton of molten slurry and high in heat preservation cotton qualification rate.

The utility model relates to the technical field of medical oxygen generators, and discloses a high-efficiency energy-saving PSA oxygen generator which comprises an adsorption tank, a gas inlet pipeline, a nitrogen discharge pipeline, an I-shaped balance pipeline, a first purging pipeline, a second purging pipeline, an oxygen outlet pipeline, a purity measurement pipeline, a qualified gas pipeline, an unqualified gas pipeline and an emptying pipeline, a throttling element is arranged on each of an inlet pipeline and an outlet pipeline of the adsorption tank and used for controlling the flow of gas when the adsorption tank is balanced, impact of high-speed gas on a molecular sieve is avoided, oxygen-enriched air can stay at the top of the adsorption tank in various balance modes, and desorbed low-concentration oxygen is adsorbed again to obtain the oxygen-enriched air. And the oxygen recovery rate is improved, so that the air consumption is reduced, the required power of an air compressor is reduced, and the energy consumption required by oxygen production is reduced.

The invention provides a process method and system for directly capturing carbon dioxide from air and converting and utilizing the carbon dioxide. The process method comprises the following steps: adsorbing raw material gas through a carbon dioxide trapping device, and heating and desorbing to obtain purified carbon dioxide gas; the purified carbon dioxide gas and the electrolyte are subjected to electrocatalytic conversion to obtain synthesis gas, oxygen and condensate water, and the condensate water is recycled through water treatment operation to be used for supplementing the electrolyte; the method comprises the following steps: carrying out Fischer-Tropsch synthesis reaction, hydrocracking and isomerization reaction on synthesis gas to obtain an isomerized oil-gas mixture, wherein heat energy generated by the reaction provides heating desorption heat; and carrying out gas-liquid separation on the heterogeneous oil-gas mixture to obtain combustible gas and an upgraded oil product, carrying out rectification operation on the upgraded oil product to obtain an SAF component and a heavy oil product, and carrying out oxygen-enriched combustion reaction on the combustible gas and oxygen to provide heating desorption heat or supply required heat energy. An integrated and flexible industrial technology platform is developed, carbon capture and conversion processes are seamlessly connected, full-chain optimization from CO2 removal to high-added-value product generation is realized, and self heat energy requirements and wastewater utilization can be met.

A process and a plant for the production of hydrogen or for the synthesis of ammonia, said process comprising the following steps: (a) performing a reforming process (101) of a hydrocarbon feedstock (1) to generate a raw syngas (2), said reforming process comprising at least an autothermal reforming step (104) in presence of oxygen-enriched air or pure oxygen (3) produced by an air separation unit (ASU; 103); (b) subjecting said raw syngas (2) to a post-treatment (102) providing hydrogen (H2; 4), a CO2-enriched stream (5), and a residual gas (6); said post-treatment comprising at least a water gas shift conversion step (105) of said raw syngas into a shifted syngas (7), a pressure swing absorption step (106), and a cryogenic separation step (107); wherein said pressure swing absorption step produces said hydrogen and a first tail gas (8) comprising carbon monoxide (CO), carbon dioxide (CO2), residual hydrogen (H2) and unreacted hydrocarbon feedstock from the shifted syngas (7), and said cryogenic separation step separates the CO2-enriched stream and a second tail gas (9) from said first tail gas; said post-treatment (102) comprising a further separation step (120) of a CO2-containing stream (11) and of the residual gas (6) from said second tail gas; (c) recycling said residual gas (6) as feed to said reforming process and / or as fuel to one or more fired heater(s) (10) of said process; (d) optionally feeding a portion (4.8) of said hydrogen (4) obtained in step (b) as fuel to one or more fired heater(s) of said process; (e) optionally an ammonia synthesis step (110) wherein said hydrogen (4) and a nitrogen (N2)-containing stream (12) produced by said ASU (103) are reacted in a given stoichiometric ratio and in ammonia (NH3) synthesis conditions to obtain an ammonia-containing product (13).

The invention discloses a method for recovering iron in tailings of copper separation from copper smelting slag through combination of microwave-assisted oxidizing roasting and magnetic separation, and belongs to the technical field of metallurgical solid waste resource utilization. The method comprises the steps that high-temperature copper smelting slag is subjected to water quenching, crushing and ore grinding, flotation and copper removal to obtain tailings containing silicon iron, after a calcium-based additive is added for ball milling and mixing, microwave oxidizing roasting is conducted under the oxygen-enriched condition, roasting products are subjected to high-gradient magnetic separation after crushing and ore grinding, and iron ore concentrate and magnetic separation tailings are obtained. According to the method, the strong wave-absorbing characteristic of fayalite is utilized, the roasting temperature and energy consumption are reduced through microwave heating, iron-silicon separation is achieved through a calcium-based additive, and iron is recycled through magnetic separation in one step. The final magnetic separation iron recovery rate reaches 85% or above, the iron ore concentrate grade exceeds 60%, magnetic separation tailings can be used as building materials, the process is simple, the cost is low, environment friendliness is achieved, the defects of a traditional process are overcome, and high-value utilization of solid waste is achieved.

The invention relates to a biomass hard carbon negative electrode material based on controllable pre-oxidation crosslinking as well as a preparation method and application of the biomass hard carbon negative electrode material. The method comprises: pretreating biomass with a metal salt structure directing agent; carrying out pre-oxidation crosslinking on the pretreated biomass precursor in an oxygen-enriched atmosphere; and carrying out stepped carbonization on the pre-oxidized cross-linked intermediate under the protection of an inert atmosphere to obtain the biomass hard carbon negative electrode material. The hard carbon material prepared by the invention has moderate specific surface area (5-50 m < 2 > / g), high closed porosity (gt, 40%) and expanded graphite interlamellar spacing (0.38-0.40 nm). Due to the unique structure, the high reversible capacity (gt, 330 mAh / g) and excellent cycling stability are realized when the biomass hard carbon material is used for the negative electrode of the sodium ion battery, and the problems of low reversible capacity and poor rate capability of the traditional biomass hard carbon are solved.

The invention discloses a layered, zoned and differentiated CO2 injection system and method for a blast furnace, and belongs to the technical field of ferrous metallurgy low carbon. The system comprises a CO2 supply and distribution system, a tuyere area injection module, a furnace body middle-lower part injection module and a furnace body upper part injection module. And according to the temperature gradient and atmosphere layering characteristics in the blast furnace, a differential CO2 distribution proportion and a collaborative thermal compensation strategy are adopted. An oxygen-CH4 synergistic injection device is arranged in a tuyere area, and rapid conversion of CO2 is promoted by using a high-temperature strong reducing atmosphere; a biomass charcoal synergistic injection device and an angle-adjustable nozzle are arranged at the middle lower part of the furnace body, so that efficient gasification reaction is realized; and low-concentration CO2 mixed injection is adopted at the upper part of the furnace body, so that indirect reduction reaction is promoted. According to the invention, the CO2 conversion rate is 65-80%, the coke ratio is reduced by 15-25%, the consumption of CO2 per ton of iron is 260-90Nm < 3 >, the carbon emission is obviously reduced, and the ironmaking efficiency is improved.

The invention relates to the technical field of metal smelting, in particular to a metal smelting temperature control method and system. The system comprises a temperature monitoring module, a gas analysis module, a thermodynamic simulation module and a dynamic regulation and control module, the thermodynamic simulation module sets a fitness function according to the Gibbs free energy value, and obtains the optimal temperature and oxygen potential through a particle swarm optimization algorithm; the dynamic regulation and control module is used for converting the theoretical optimal temperature of the thermodynamic model into precise operation, and efficient and stable control over the smelting temperature is achieved. According to the method, the reaction process in the furnace and the current optimal temperature and oxygen potential are accurately controlled on the basis of the Gibbs free energy value and the particle swarm optimization algorithm, the theoretical optimal temperature of a thermodynamic model is converted into precise operation through multi-PID cooperative control, and efficient and stable control over the antimony smelting temperature is achieved; and therefore, the problem that the oxygen-enriched smelting temperature is not accurately controlled is fundamentally solved, the extraction rate of metal is increased, and energy consumption is reduced.

The utility model discloses a fresh-keeping device for a refrigerator and the refrigerator, and relates to the field of refrigerators. The refrigerator is provided with at least two mutually independent fresh-keeping chambers, the fresh-keeping device comprises at least two oxygen-enriched assemblies, and each oxygen-enriched assembly comprises an oxygen-enriched membrane and a collecting cavity; and an air extractor. At least one oxygen enrichment assembly is a gear-adjustable oxygen enrichment assembly, the number of oxygen enrichment membranes in the gear-adjustable oxygen enrichment assembly is at least two, and each oxygen enrichment membrane is correspondingly provided with a collecting cavity. The gear-adjustable oxygen enrichment assembly further comprises at least two branch channels and a gear adjusting piece, the branch channels correspond to the at least two collecting cavities, one end of each branch channel is connected with the collecting cavity, the other end of each branch channel is connected with the exhaust pipe, and the gear adjusting piece is used for controlling opening and closing of the branch channels and controlling the opening and closing number of the branch channels. According to the fresh-keeping device disclosed by the utility model, a single air extractor is used for efficiently reducing oxygen in a plurality of fresh-keeping chambers, so that the cost is relatively low. And the oxygen reduction capacity of the fresh-keeping chamber can be adjusted, and the requirements for oxygen concentration of different types of food materials can be met.

The invention discloses a safe, rapid and environment-friendly blast furnace blowing-out method which comprises the following steps: 24 hours before blast furnace blowing-out and charge level lowering operation, adjusting fuel to be 20% higher than that of normal production fuel, lowering binary alkalinity of a slag system to be 1.0-1.05 times, and not adding a water gun; after the charge level lowering operation is started, the blast furnace keeps high oxygen enrichment blast smelting, and the oxygen enrichment rate is 15-20%; circulating decarburized coal gas is sprayed into a tuyere, the spraying amount of each ton of iron is 100-150m < 3 > / t, the theoretical combustion temperature of the tuyere is adjusted to be not higher than 2400 DEG C, the water pumping amount of the furnace top is reduced by 30%, and the top temperature is kept not higher than 350 DEG C in the water pumping operation of the furnace top; a pressure regulating valve group is kept in a normally open state during the charge level lowering operation, and the O2 content in the coal gas does not exceed 1%; and the oxygen enrichment rate is kept at 7-10% during the period, decarburized gas tuyere injection is stopped, the top temperature is kept not exceeding 400 DEG C until the tuyere blows through, and the furnace shutdown operation is completed.

The invention relates to the technical field of oxygen-enriched equipment, which comprises an oxygen-enriched membrane assembly main body, a vertical gas injection part is arranged at one end, far away from a gas separation membrane assembly, of a gas connecting pipe, and a gas flow driving part drives the vertical gas injection part to operate. By arranging the vertical air injection part, when a second fan-shaped guide wheel rotates by 360 degrees under the operation of an airflow driving part, a semicircular air blocking plug shields a honeycomb flow guide plate in the process, and then part of compressed air penetrating through a flow dividing bent pipe enters an air exhaust bin through a one-way valve; then the semicircular air blocking plug loses the shielding of the honeycomb guide plate, and finally the compressed air in the air exhaust bin is exhausted into the gas separation membrane assembly, so that the compressed air vertically acts on one end of the gas separation membrane assembly, and the adsorption balance of each area in the gas separation membrane assembly is realized; the utilization rate of the gas separation membrane assembly is improved, and the flowability of the compressed air is enhanced by pushing the compressed air through the piston rod.

According to the system and the control method for improving the sinter quality of the sintering machine, the oxygen concentration in ignition combustion-supporting gas is actively and intelligently adjusted, and traditional passive adaptation is converted into active precise adjustment and control. And the mixing flow of the oxygen-enriched gas is dynamically adjusted according to monitored real-time data, so that the constant optimal ignition intensity is maintained. And then an optimized ignition system matched with oxygen-enriched ignition is designed, and generation of high-strength binding phase calcium ferrite is facilitated. And finally, through safety interlocking, when combustion-supporting air is abnormal, the oxygen content is too high and no coal gas is supplied, an oxygen-enriched pipeline stop valve needs to be closed, so that the system safety is guaranteed. The ignition uniformity and stability are improved, the ore return rate is effectively reduced, and a virtuous cycle is formed.

The invention discloses an artificial geothermal reservoir construction and development method based on oil shale reverse oxidation, and belongs to the technical field of resource exploitation, the method comprises the following steps: reservoir well construction: arranging an injection well, an exploitation well and a heat recovery well in a target layer section; an initial high-temperature environment is formed through manual heating, so that the oil shale is pyrolyzed to generate fixed carbon; injecting air to form an oxygen-enriched environment, initiating a fixed carbon oxidation self-heating reaction, and continuously pyrolyzing the oil shale; terrestrial heat is exploited through a circulating working medium, the air flow and components are dynamically controlled, and temperature control and safe operation are achieved; and finally reinjecting and sealing the carbon dioxide. The device can convert low-grade oil shale into clean geothermal energy, and has the advantages of energy conservation and environmental protection.

The invention is suitable for the technical field of automatic control, and provides an MPC heating furnace oxygen-enriched combustion control system parameter optimization method based on reinforcement learning, which comprises the following steps: step 1, production line data is acquired, and the acquisition of the production line data is mainly to acquire real data of an actual cement production control production line, including MV, OV and DV data; and step 2, obtaining a state space model, the obtaining of the state space model comprising establishing a model of converting a first-order transfer function into a state space, the MPC parameter adjustment is performed by using the prominent learning ability and adaptive ability of a reinforcement learning (RL) method, the dynamic adjustment according to the change of the system can be realized, and the control accuracy of the system is improved. And training the current oxygen-enriched combustion control algorithm according to the state information under the existing decision-making condition so as to output the expected furnace temperature, and evaluating the effectiveness of the control algorithm through the prepared evaluation standard.

The blast furnace front oxygen enrichment system comprises a low-pressure oxygen pipeline laid between an oxygen station and an iron making plant, the low-pressure oxygen pipeline is connected with a blast furnace blower through an oxygen branch pipe, an air outlet of the blast furnace blower is communicated with an air inlet of a blast furnace, and the oxygen branch pipe is provided with a flame arrester and a second manual stop valve. A security nitrogen pipe is connected between the flame arrester and the second manual cut-off valve, and a stop valve, a nitrogen buffer tank and a nitrogen quick cut-off valve are sequentially arranged on the security nitrogen pipe in the airflow direction; the oxygen analyzer monitors the oxygen content in the oxygen branch pipe in real time and transmits a monitored value to the PLC, the PLC judges whether the oxygen enrichment rate of a preset instruction is reached or not, and the flow regulating valve is regulated through the PLC; the system is simple in structure, reasonable in design, convenient to implement, capable of being effectively applied to blast furnace smelting, capable of saving electric energy and production cost, good in using effect and convenient to popularize and use.

The invention discloses a low-nitrogen gas burner suitable for various working conditions and a using method of the low-nitrogen gas burner. The low-nitrogen gas burner comprises an assembly cylinder, an outer-layer fire pan, a central fire pan, an inner-layer gas gun, an outer-layer gas gun and an oxygen gun. The height of the center fire pan is adjusted through the lifting assembly, and switching of three modes of air combustion supporting, oxygen-enriched combustion supporting and pure oxygen combustion supporting is achieved. The air adjusting assembly controls the combustion-supporting air flow; the flow comprehensive adjusting assembly adjusts fuel gas supply and oxygen supply in a linkage mode. The combustor adopts a staged combustion design, the inner-layer gas gun forms first-stage flame at a fire pan gap, the outer-layer gas gun and a combustion-supporting medium ejected from the central fire pan form second-stage combustion, and the temperature of the flame is reduced by ejecting hearth smoke. Cooperative control over all the executing mechanisms is achieved through the driving motor and the speed setting assembly, the beneficial effects that combustion modes are automatically switched, the flame temperature is accurately regulated and controlled, and emission of oxynitride is low are achieved, and the clean combustion requirements of different industrial furnaces can be met.

The invention relates to the technical field of environmental protection, and discloses a biomass boiler oxygen-enriched combustion and biomass fly ash potassium extraction method which comprises the following steps: step 1, high-carbon-dioxide-concentration flue gas generated after biomass is subjected to oxygen-enriched combustion in a boiler is cooled, fly ash is separated, the flue gas enters a flue gas heat exchanger, and low-temperature flue gas and hot air are obtained after heat exchange with cold air; 2, fly ash obtained through separation and water are mixed and stirred, a water-ash mixture is obtained, CO2 is introduced into the water-ash mixture, and the ash mixture and low-temperature flue gas are subjected to a contact reaction; step 3, performing solid-liquid separation on the water-ash mixture after the reaction to obtain a potassium-rich solution A and a filter residue A, dividing the solution A into a solution B and a solution C, returning the solution B to the contact reaction tank for circulation, and enabling the solution C to enter a concentration device; 4, heating and concentrating the solution C through hot air to obtain a solution D; and 5, carrying out solid-liquid separation on the solution D to obtain potassium salt and mother liquor F. The method is simple in process, low in extraction cost and high in product purity.

The invention relates to the technical field of oxygen-enriched combustion safety and flammability limit prediction, and provides a flammability limit value prediction method and application, and the method comprises the steps: obtaining the initial parameters of a gas fuel in a mixed atmosphere of oxygen and carbon dioxide; simulating a combustion process by using an element reaction mechanism, and outputting a curve of component mole fractions changing along with time; the combustion enthalpy change rate under the target atmosphere and the virtual atmosphere is calculated based on the curve, and carbon dioxide in the virtual atmosphere is replaced with virtual gas which has the same thermophysical property but does not have chemical reactivity; respectively calculating combustion heat release, mixture heat absorption and heat radiation; and in combination with the enthalpy change rate and the energy balance equation, the combustible limit value is solved and determined through numerical iteration. By quantifying the chemical effect and thermophysical influence of carbon dioxide, the problem of insufficient precision caused by neglecting the participation of carbon dioxide in reaction and unique thermal property in the oxygen-enriched combustion environment in the existing model is solved, and the method is suitable for the safety design of a combustion system.

The invention belongs to the technical field of nickel-based superalloys, and discloses a surface protection method of a superalloy material used in a high-temperature, high-pressure or oxygen-enriched environment. The method comprises the following steps: coating the surface of a high-temperature alloy material with a pure platinum coating; the high-temperature alloy material is used in at least one environment of high temperature, high pressure and oxygen enrichment; the high temperature ranges from 550 DEG C to 750 DEG C; the high pressure is 2 to 55 MPa; the rich oxygen is oxygen concentration gt; 90%. The oxygen-enriched ablation resistance of the high-temperature alloy material is improved, and the use safety of the high-temperature alloy material in a high-temperature, high-pressure and oxygen-enriched severe environment is improved.

The present invention discloses a method for improving the combustion efficiency of pulverized coal with oxygen enrichment in a blast furnace, comprising the following steps: Step 1, prepare the raw materials charged into the blast furnace, the fuel charged into the furnace, and the injection materials. The raw materials charged into the furnace are sinter, pellet, and lump ore; the fuel charged into the furnace is large coke and coke breeze, and the pulverized coal injection material for the blast furnace is a mixed powder of bituminous coal + anthracite + blast furnace slag; Step 2, the blast furnace adopts a burden distribution mode of "restraining the peripheral gas flow + developing the central gas flow", and the mass percentage of the ore charged at the periphery is 33.3 - 35.7% of the ore batch; Step 3, the oxygen enrichment rate adopted by the blast furnace is 10 - 14%, and the air inlet area is adjusted according to the actual air volume of the blast furnace, with the actual wind speed being 285 - 300 m / s; Step 4, the blast furnace smelts with technical parameters of a hot blast temperature of 1250 - 1350 °C and a coal injection ratio of 190 - 220 kg / t·Fe, realizing the improvement of the combustion efficiency of pulverized coal with oxygen enrichment in the blast furnace. This method can increase the oxygen enrichment rate of the blast furnace blast, increase the output of the blast furnace, use a large proportion of high-volatile bituminous coal for injection, increase the coal ratio charged into the furnace, and reduce the coke consumption.

The invention discloses a megawatt pressurized bubbling fluidized bed oxygen-enriched combustion test platform and a combustion method. The platform comprises a feeding system, a pressure swing adsorption oxygen production and gas inlet system, a deslagging system, an oxygen-enriched combustion reaction system and a flue gas and fly ash sampling treatment system. The feeding system adopts a spiral and star-shaped double-path independent pressure feeding unit, and is provided with a multi-stage stock bin, a drying device and a pipeline cooling structure, so that pressurized continuous feeding is realized, and tempering is prevented; the pressure swing adsorption oxygen generation and gas inlet system generates oxygen-enriched gas through a PSA technology, and the oxygen-enriched gas is mixed with CO2 to form a graded oxygen-enriched atmosphere; according to the oxygen-enriched combustion reaction system, accurate temperature control is achieved through an air distribution plate, a reducer pipe and a partition heat exchange device, and generation of NOx is restrained; the problems of unstable fuel supply, unreliable deslagging, low combustion efficiency, difficulty in CO2 enrichment and the like under the high-pressure oxygen-enriched combustion condition in the prior art can be effectively solved.

According to the oxygen-enriched combustion system of the circulating fluidized bed boiler and the operation method, under the oxygen-enriched combustion working condition, part of low-temperature and clean flue gas at the tail is led back, mixed with pure oxygen and then fed into a hearth, the total in-furnace gas flow after mixing is kept equivalent to the original total in-furnace air flow, and the total in-furnace gas flow after mixing is kept equivalent to the original total in-furnace air flow; when the mixed gas entering the furnace keeps the oxygen volume concentration equivalent to or slightly higher than that of air, the problems of fluidization, combustion and heat transfer in a hearth can be completely solved, and safe, reliable, economical and environment-friendly operation of a unit can be guaranteed; after air is completely replaced by the mixed gas, the CO2 concentration in the generated flue gas is greatly improved and can reach 80% or above at most, and CO2 can be captured with low cost and high efficiency; according to the invention, free switching between air combustion and oxygen-enriched combustion can be realized.

The invention relates to the technical field of portable oxygen production equipment, and particularly discloses an adsorption device for a portable oxygen generator, the adsorption device comprises a portable machine shell and an adsorption mechanism, the portable machine shell is provided with an air inlet through hole and an air outlet through hole, the adsorption mechanism comprises an oxygen-enriched element, the portable machine shell is provided with an air supply pipe head, and the air supply pipe head is provided with an air outlet through hole. An airflow pipeline is connected between the oxygen-enriched element and the air supply pipe head; the oxygen enrichment device further comprises an air supply air pump located between the oxygen enrichment element and the air supply pipe head, an auxiliary air pipe, an auxiliary air valve and a humidity sensor, the auxiliary air valve is located on the auxiliary air pipe, one end of the auxiliary air pipe is connected with the airflow pipeline, and the connecting point is located between the oxygen enrichment element and the air supply air pump. The humidity sensor is used for detecting humidity in the airflow pipeline. According to the invention, the auxiliary gas pipe is connected in parallel beside the oxygen-enriched element, so that gas can enter the gas flow pipeline without passing through the oxygen-enriched element when water in the gas flow pipeline is removed, the water removal effect is relatively high, and the consumption of oxygen is relatively low.

The present invention relates to a method for determining the temperature of the bosh gas of a low-carbon blast furnace with multi-media injection, which belongs to the field of blast furnace ironmaking. First, the effective heat of coke Q is calculated based on the basic parameters of blast furnace operation and the composition of blast furnace injection materials and coke. net‑coke 、Effective heat of pulverized coal Q net‑coal , hot air effective heat Q net‑blast , effective heat of pulverized coal carrier gas Q net‑gas , effective heat of gas injection #imgabs0# effective heat of oxygen enrichment Q net‑carry The effective heat of the medium sprayed by the tuyere and the heat taken away by the cooling water at the tuyere Q net‑loss Secondly, the bosh gas content V is calculated by the chemical reaction in the tuyere raceway and the conservation of matter. bosh and average heat capacity c bosh , unburned coal powder content m C and average heat capacity c C The ash content m generated by the consumption of coke and pulverized coal at the tuyere ash and average heat capacity c ash ; Finally, calculate the furnace gas temperature T through the heat balance of the tuyere area f The present invention can accurately, reasonably and effectively reflect the actual thermal state and status of the hearth area, and provides an important judgment basis and technical foundation for guiding the adjustment of the lower part of the blast furnace.

The invention discloses flue gas recirculation and oxygen-enriched combustion collaborative denitration equipment for a pulverized coal fired boiler, and belongs to the technical field of collaborative denitration. The pulverized coal boiler comprises a heat exchange tank, and a combustion tank and a smoke return pipe are arranged in the heat exchange tank. One side of the smoke return machine shell communicates with a combustor shell, and the combustor shell communicates with the combustion tank. An igniter and a graded oxygen-enriched combustor are arranged in the combustor shell, and the graded oxygen-enriched combustor comprises a central oxygen channel structure, a pulverized coal air channel structure and a compensation oxygen channel structure; core flames of pulverized coal air are ignited through the central oxygen channel structure, then the pulverized coal air with low oxygen content sprayed out of the pulverized coal air channel structure is ignited through the core flames, and a low-oxygen combustion section close to the root of the fire tongue is formed. Oxygen is sprayed out through the compensation oxygen channel structure, so that pulverized coal air is subjected to oxidation reaction and is fully combusted; according to the invention, a staged combustion effect can be formed, nitrate substances generated by a pulverized coal oxidation reaction are greatly reduced, and the capability of denitration of combustion flue gas is improved.

The invention discloses a metal recovery method of a waste hydrodesulfurization catalyst containing vanadium and molybdenum, which comprises the following steps: grading ball milling activation: mixing the waste hydrodesulfurization catalyst and an inorganic salt auxiliary agent according to a preset mass ratio, adding the mixture into a ball milling tank, and carrying out ball milling on the mixed material by adopting grinding balls with different diameters according to different grading ratios, meanwhile, the ball-to-material ratio is controlled, and activated ball-milled powder is obtained; oxygen-enriched roasting: putting the activated ball-milled powder into a roasting furnace, and introducing oxidizing gas into the roasting furnace for roasting to obtain an oxygen-enriched roasted material; and low-temperature alkaline leaching is conducted, specifically, the oxygen-enriched roasting material is placed in an alkaline leaching medium according to the preset solid-to-liquid ratio, solid-liquid separation is conducted after the reaction is completed, and vanadium-molybdenum metal enrichment liquid is obtained. According to the method, grading ball milling and oxygen-enriched roasting enhanced oxidation processes are innovatively coupled, so that valence bonds of V-S-O or Mo-S-O in the waste HDS catalyst are broken, sufficient oxidation of low-valence V / Mo is realized, and efficient recovery of vanadium and molybdenum is realized at low temperature and normal pressure.

The invention discloses an oxygen-enriched combustion tail gas multi-pollutant integrated purification and emission process and device, and particularly relates to the field of tail gas purification, the device comprises a cooling tower, a tail gas dryer and a purification box, a first gas conveying pipe is inserted in the side wall of the cooling tower, and the cooling tower and the tail gas dryer are connected through a second gas conveying pipe; the tail gas dryer is connected with the purifying box through a third gas conveying pipe, a plurality of sets of filtering pieces are transversely arranged in the purifying box, and recycling pieces for recycling activated carbon particles are arranged below the filtering pieces; through treatment by the cooling tower and the tail gas dryer, the temperature and humidity of the tail gas are reduced, the adsorption efficiency of the activated carbon to pollutants such as volatile organic compounds is improved, the pollutant concentration is further reduced, stable up-to-standard emission is ensured, meanwhile, quick replacement of the activated carbon is realized through automatic mechanical control, the compactness and adsorption uniformity are ensured, and the service life of the activated carbon is prolonged. A closed-loop management mechanism reduces waste, accelerates regeneration speed and improves resource utilization rate.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

This invention belongs to the field of peak-shaving technology for thermal power units, specifically a deep peak-shaving method for thermal power units that combines electrolytic hydrogen production with ammonia synthesis and energy storage. It integrates an electrolytic hydrogen production with ammonia synthesis and energy storage system, an energy comprehensive utilization system, and a collaborative control system to form a closed-loop peak-shaving system: during off-peak periods, excess electricity from the thermal power unit is collected; during peak periods, the stored ammonia is used to supplement the unit's energy through coal-ammonia co-firing, while oxygen is utilized for oxygen-enriched combustion to enhance peak-shaving and stable combustion capabilities. The synthesized ammonia can also replace purchased ammonia for flue gas denitrification. Through the collaborative control system, the operation of each link is coordinated, achieving efficient energy conversion and precise control. This invention significantly improves the deep peak-shaving and peak-response capabilities of thermal power units, substantially reduces carbon and pollutant emissions, optimizes energy utilization efficiency, extends equipment lifespan, and provides strong support for the green transformation of coal-fired power and the stable operation of new power systems.