861 results about "Oxygen content" patented technology

The invention provides a method for solving signal drift of an oxygen sensor in a high-temperature and high-pressure environment, which comprises the following steps: collecting acid-base gas concentration data and zirconium oxide material surface state information in the high-temperature and high-pressure environment, and classifying erosion sensitivity degrees by adopting a support vector machine algorithm to obtain an initial response characteristic deviation value; a neural network model is adopted to process the determined potential signal drift trend and oxygen content detection historical data, a simulation response characteristic curve is generated, and a quantitative mapping relation of the pH value change to erosion sensitivity is obtained; refining the correlation between the determined long-term monitoring reliability index and the pH value change by adopting a neural network model, generating a dynamic response characteristic prediction sequence, and obtaining a signal drift suppression threshold set; and through fusion of the obtained signal drift suppression threshold set and the oxygen content detection real-time signal, if it is judged that erosion sensitivity is aggravated in a prediction sequence, a compensation model is activated to update and circulate, and optimized sensor stable output is obtained.

The invention provides an argon flow and micro-positive pressure linkage control method for an electroslag furnace. The method comprises the steps that the oxygen content and micro-positive pressure signals in the furnace are collected; the future furnace condition is predicted through the deep belief network model; optimizing initial parameters of the fuzzy PID controller in an off-line manner by using a particle swarm algorithm; on the basis of the real-time signal and the prediction result, adaptively adjusting controller parameters on line; and finally, an argon flow and dust removal valve opening control instruction is output in a linkage mode. According to the method, future furnace conditions are predicted through the deep belief network model, the control advancement is realized, and the problem of large lag of the system is solved; offline parameter optimization is carried out on the fuzzy PID controller through a particle swarm algorithm, and excellent initial performance adapting to different working conditions is provided for the fuzzy PID controller; the parameters of the controller are adaptively adjusted through online fuzzy reasoning, so that the system has robustness for coping with a dynamic process; finally, accurate and stable linkage control of the oxygen content in the furnace and the micro-positive pressure is achieved through linkage calculation of the argon flow and a dust removal valve opening instruction.

The invention belongs to the field of chemical engineering manufacturing industry, and relates to equipment and a method for producing cyclic ketone compounds by oxidizing cycloolefin by using waste gas produced by adipic acid. Raw material gas A containing nitrous oxide from an adipic acid production process production line can be subjected to oxygen removal, so that the oxygen content is less than 100ppm; the raw material gas A containing nitrous oxide from the adipic acid production line can also be purified into purer gas containing 50-99% of N2O, and the purer gas is used for reacting with the cycloolefin compound; the reaction equation is CnH2n-2 (cycloolefin) + N2O (nitrous oxide)-> CnH2n-2O (a product cyclic ketone compound) + a byproduct + N2 superscript (nitrogen), wherein n is a positive integer from 4 to 24. The device is stable in consumption quota, low in production cost and high in economic benefit compared with the prior art.

The invention provides a crystal pulling method for improving the BMD defect density in monocrystalline silicon and a monocrystalline silicon rod, and belongs to the technical field of monocrystalline silicon crystal pulling, and particularly relates to the following steps: stabilizing the oxygen content in a crystal in a relatively high interval by cooperatively regulating and controlling the argon flow, the furnace pressure, the crucible rotating speed, the crystal rod rotating speed and the pulling speed, providing a sufficient oxygen source for generation of BMD defects, and improving the BMD defect density in the monocrystalline silicon on the basis of stabilizing the oxygen content in the crystal in a relatively high interval. In the equal-diameter process, temperature compensation is carried out on a crystal bar through a preset temperature compensation device, diffusion and precipitation of oxygen atoms are effectively promoted to form BMD crystal nucleuses, the BMD body defect density and the axial distribution uniformity are remarkably improved, the specification lower limit of the BMD density is promoted to be improved to 1.0 E + 11 ea / cm < 3 > or above, the internal gettering capacity of a silicon wafer is finally enhanced, and the service life of the silicon wafer is prolonged. And a reliable guarantee is provided for improving the performance and yield of the device.

The invention provides a recirculation flue gas denitration load reduction evaluation method, which comprises the following steps: acquiring flue gas temperature, residual oxygen concentration and recirculation flow transmitted by a multi-point temperature collector and an oxygen content monitoring device, and performing data fusion processing to obtain temperature gradients and oxygen concentration gradients corresponding to different extraction positions; a preset target oxygen concentration threshold value of the denitration system is obtained, the deviation degree of the local oxidizing atmosphere strengthening degree grade and the target oxygen concentration threshold value is evaluated, the oxygen content proportion of the hearth is adjusted according to the deviation degree, and a wind pressure set value is obtained; and the recirculation flow and the residual oxygen concentration variation corresponding to the optimal extraction scheme are extracted, the oxygen concentration reduction amplitude is evaluated, the denitration load reduction proportion is quantified according to the oxygen concentration reduction amplitude, and denitration load reduction is evaluated.

The invention relates to the technical field of fishery breeding, and particularly discloses a fry hatching device for schizothorax breeding, comprising a support frame, the top of the support frame is fixedly connected with a hatching box and a breeding box, the side surface of the hatching box is fixedly connected with the side surface of the breeding box, and two sides of the inner wall of the breeding box are fixedly connected with plastic plates; the fry hatching equipment comprises a hatching box and a breeding box, the side faces of the hatching box and the breeding box communicate with water adding pipes, the bottom of the side face of the hatching box penetrates through and is fixedly connected with a purification assembly, and an inlet is formed in the side, close to the hatching box, of the inner wall of the breeding box. And the aeration device is arranged, so that the content of dissolved oxygen in the incubator can be increased, sufficient oxygen is provided for fertilized eggs, and healthy growth of the fertilized eggs is promoted.

The invention relates to an intelligent combustion monitoring and rapid intervention control method and system for deep peak regulation of a coal-fired boiler. The method comprises the following steps: reconstructing a two-dimensional temperature field of a hearth through regularization optimization modeling by utilizing hearth infrared measuring point data; constructing a coal quality dynamic identification model to realize dynamic monitoring and trend prediction of coal quality fluctuation; a combustion state nonlinear probability fusion model is constructed, on the basis of a probability graph model, information such as flame detection signals, hearth negative pressure, flame images, oxygen amount, steam drum water level, coke falling and coal interruption is fused, joint probability distribution is constructed, time sequence incremental learning is conducted in combination with an XGBoost model, and dynamic recognition and early warning of the combustion state are achieved. Key parameters such as a flame image, temperature field distribution and negative pressure fluctuation are collected in real time by means of a hearth multi-dimensional combustion state recognition model, a decision module is triggered when a combustion state score reaches an early warning threshold value, a quick oil gun is triggered to be put into use, and early warning in advance is changed into quick intervention.

The invention belongs to the technical field of semiconductor crystal growth, and particularly relates to a magnetic field dynamic adaptation system and method for improving single crystal oxygen content uniformity, the melt liquid level height H is sensed in real time through a liquid level position sensing unit, thermal field state data W is obtained through a temperature zone monitoring unit, and the single crystal oxygen content uniformity is improved on the basis of the melt liquid level height H and the thermal field state data W. And the control module converts the target position Pz into a driving instruction and sends the driving instruction to the magnetic field execution module to drive the magnetic field execution module to synchronously and dynamically adjust the magnetic field space position of the magnetic field generator, converts the target intensity Btarget into a driving instruction and sends the driving instruction to the magnetic field execution module to drive the magnetic field execution module to synchronously and dynamically adjust the magnetic field intensity of the magnetic field generator. The magnetic field space position of the magnetic field generator is dynamically adjusted to promote oxygen to be conveyed uniformly, so that the radial oxygen concentration CV value is reduced, the magnetic field intensity of the magnetic field generator is dynamically adjusted to avoid nonlinear fluctuation in the oxygen segregation process, and the linearity of an axial oxygen distribution curve is improved.

The present application relates to optical fiber surface coating treatment device technical field, especially to a kind of optical fiber metal coating spraying device, including the spraying mechanism of lower shell, shunt chamber, combustion chamber and ring spray component composition, and for driving the linear drive mechanism and rotary drive mechanism of rotary movement of spraying mechanism.The present application is by being provided with independent oxygen passage, hydrogen passage and metal powder passage in shunt chamber, and by corresponding oxygen hole, hydrogen hole and metal powder hole spray into combustion chamber, it is realized in the state that oxygen content is higher, to metal powder realizes rapid melting, improves the purity of metal molten liquid;And by the ring array side nozzle on annular jet pipe, it is realized to the overall metal coating of optical fiber surface;While improving the controllability of optical fiber surface metal coating quality and coating thickness and uniformity.

The present application discloses an oxygen concentration detection system for detecting the oxygen concentration in a furnace chamber of a reflow oven, comprising: a cooling device, a filter device, and a detection device. The oxygen concentration detection system of the present application utilizes a semiconductor cooler to condense sample gas within the furnace chamber, thereby removing most of the VOC contaminants in the sample gas. Subsequently, by employing activated carbon adsorption filtration, all contaminants in the gas are basically eliminated, resulting in a more accurate detection result from the detection device. Furthermore, due to the rapid cooling capabilities of the semiconductor cooler and the relatively short sample gas flow distance, the oxygen concentration detection system of the present application is also capable of reducing the required detection time, enabling more timely detection from the detection device. Therefore, the oxygen concentration detection system of the present application is capable of timely and accurately detecting the oxygen concentration in a gas within a reflow oven furnace chamber and adjusting the oxygen content therein according to the detection result, thereby enhancing the soldering quality.

The utility model discloses a micro-power nitrogen removal tank. The micro-power nitrogen removal tank comprises a first chamber, a second chamber, a fluid discharge channel and a gas supply unit, wherein the first chamber is used for reducing oxygen content; the second chamber is used for removing nitrogen; the first chamber is provided with a water inlet, the upper part of the first chamber is communicated with the upper part of the second chamber, and the lower part of the second chamber is communicated with the lower part of the fluid discharge channel; the gas supply unit is communicated with the lower part of the fluid discharge channel and is used for introducing gas into the fluid discharge channel; during application, aerobic bacteria can be added into the first chamber, and anaerobic bacteria can be added into the second chamber; sinking the micro-power nitrogen removal tank added with the strain into a sewage water body; the micro-power nitrogen removal tank disclosed by the utility model can realize flowing of an internal water body only under the action of airflow, is extremely low in energy consumption, and can assist in realizing removal of total nitrogen under the condition that the ecology of a natural water body is not changed.

The invention provides a preparation method and application of a pure copper coating, and relates to the field of surface functional coatings, and the preparation method comprises the following steps: preparing pure copper powder, and carrying out sand blasting treatment on the surface of an aluminum alloy substrate; the aluminum alloy substrate is fixed in a closed cold spraying chamber, and pure copper powder is loaded into helium cold spraying equipment in the closed cold spraying chamber; vacuumizing until the pressure in the closed cold spraying chamber is lower than a preset pressure threshold value and the oxygen content in the chamber is lower than a preset value; helium in a buffer tank is adopted as main gas and powder feeding gas, and a pure copper coating is formed on the surface of the aluminum alloy substrate through spraying of helium cold spraying equipment; and the helium circulation system is synchronously started to recover helium in the cavity, and the helium is compressed into the buffer tank after being filtered and cooled, so that helium circulation is realized. The method adopts the circulating helium atmosphere to avoid the problem that the impurity content of the coating is increased due to high-temperature oxidation of the copper coating, the oxygen content of the coating is remarkably reduced, and the particle interface bonding is improved, so that the electric conduction and heat conduction performance of the pure copper coating is improved, and the helium use cost is reduced.

The invention relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The application discloses a two-step high-purity nitrogen preparation process, and a device required by the process comprises a filter, an air compressor, an air precooling system, a purification system, a main heat exchanger, a nitrogen column, a main condensation evaporator I, a supercooler, an argon removal column, a main condensation evaporator II and an expander. The raw material air is separated by a nitrogen column rectification to obtain pressure nitrogen, and then the pressure nitrogen is introduced into the argon removal column as raw material gas to continue rectification, so that high-quality nitrogen product and low-quality nitrogen product can be obtained at the same time, the high-quality nitrogen product can meet the production process requirements of high-end chips, and the low-quality nitrogen product can be supplied to users with relatively low requirements on impurities such as argon content and oxygen content, so that the demand of users on different quality nitrogen products can be met to the maximum extent. The application can also provide high-quality liquid nitrogen product.

This invention relates to the field of thermal power generating unit operation control, and discloses a method for coordinated control of coal consumption and low-NOx emissions in supercritical units. The method includes: collecting operating data such as unit load, coal feed rate, air volume, furnace outlet oxygen content, CO concentration, SCR inlet NOx concentration, SCR outlet NOx concentration, ammonia injection rate, and main steam pressure; dividing the control cycle according to the load change rate and the lag state of heat release into the furnace; generating candidate coal consumption optimization actions within the steady-state control cycle, and performing low-NOx margin verification and burnout constraint verification; when the verification fails, it is determined to be a low-NOx coal consumption conflict state, restricting the reduction of oxygen content and total air volume, and sequentially performing secondary air layer distribution correction, burnout air opening correction, main steam pressure setting compensation, and ammonia injection feedforward correction; after the control action is executed, the corresponding action is maintained, rolled back, or frozen based on the retest results. This invention can improve the synergy between coal consumption control and low-NOx emission control.

The application discloses a physical vapor deposition device, an electrochromic device and a preparation method thereof, and relates to the technical field of electrochromic devices. The preparation method comprises the following steps: sputtering and depositing an electrochromic layer of WO3 on the surface of a first ITO layer, and the oxygen content is any value in the range of 42.5% to 52.5%; sputtering and depositing a pre-set thickness of a tungsten oxide ion conduction layer on the electrochromic layer, and the oxygen content of the corresponding chamber is any value in the range of 35% to 45%; sputtering and depositing an ion storage layer containing lithium ions on the ion conduction layer; depositing a second ITO layer on the ion storage layer, and obtaining the electrochromic device after vacuum annealing treatment and cooling treatment; wherein the deposition temperature of the second ITO layer is any value in the range of 350 DEG C to 400 DEG C, and the annealing temperature of the vacuum annealing treatment is any value in the range of 450 DEG C to 500 DEG C. The electrochromic device prepared by the application has the characteristics of high transmittance and low sheet resistance.

The invention belongs to the technical field of oxygen content detection and dynamic calibration, and particularly relates to a dynamic calibration method for the oxygen content in a boiler air and flue gas system. The method comprises the steps of multi-working-condition data acquisition and standardization processing, failure feature extraction and feature library establishment, reference oxygen calculation model construction, data driving model construction, anomaly detection and calibration, parameter self-updating and the like, and a calibration effect real-time evaluation link is newly added. The core of the method is that a mechanism + data dual-drive mode is adopted, a reference model is constructed on the basis of a zirconia sensor Nernst equation, an improved bidirectional LSTM network is fused to construct a data drive model, and an adaptive threshold algorithm and a multi-stage calibration strategy are combined to realize accurate recognition and dynamic calibration of abnormal signals. The method is adaptive to a complex flue gas environment and a variable load operation scene, the oxygen content measurement precision is remarkably improved, low-nitrogen combustion and environmental protection compliance are guaranteed, coal consumption and operation cost are reduced, and reliable data support is provided for intelligent power plant digital transformation.

The application provides a low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and a preparation method thereof, and belongs to the technical field of powder metallurgy. According to the weight percentage, the chemical components of the powder include C≤0.02%, Cr 16.5-17.5%, Mo 0.9-1.1%, Nb 0.4-0.6%, Si 0.7-2.2%, Mn≤0.3%, P≤0.03%, S≤0.02%, and the balance of Fe and inevitable impurities. The oxygen content of the powder is ≤1200ppm, wherein the free oxygen content is ≤300ppm, and the combined oxygen content is ≤900ppm. The particle size distribution of the powder is that the proportion of particles with a size of-200 mesh is ≥90%, and the proportion of particles with a size of-300 mesh is ≥65%. The loose bulk density of the powder is 2.9-3.1g / cm3, and the flowability is ≥25s / 50g. The micro-morphology of the powder is spherical, and the sphericity is ≥0.85. The low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and the preparation method thereof have excellent corrosion resistance, low oxygen content, excellent comprehensive powder performance, process stability and scalability.

The utility model relates to the technical field of cold box interlayer gas oxygen content analysis, in particular to a cold box interlayer gas oxygen content on-line analysis device which comprises a sampling pump, a three-way electromagnetic valve, a pretreatment box, an analysis instrument and a control system, wherein the sampling pump is used for pressurizing and introducing interlayer gas of the cold box into the analysis device; the analysis instrument is used for analyzing the oxygen content in the pretreated gas; the three-way electromagnetic valve is arranged between the sampling pump and the analysis instrument and is used for remotely switching and analyzing the waste nitrogen and the cold box interlayer gas; the pretreatment box is connected between the three-way electromagnetic valve and the sampling pump. Through remote switching of the three-way solenoid valve and automatic logic setting of the DCS, online intelligent analysis of the oxygen content of the interlayer gas of the cold box is achieved, and the analysis accuracy and efficiency are improved; and an operator can finish the analysis work of the waste nitrogen and the interlayer gas of the cold box without frequently and manually switching an analysis instrument, so that the operation burden is reduced.

The invention discloses a cooperative control method and system for a membrane deoxidization rate and temperature, and belongs to the technical field of membrane deoxidization control. The method comprises the steps that the real-time liquid flow and the real-time oxygen content in the deoxidizing film, the liquid temperature of the front surface of the deoxidizing film and the liquid temperature of the rear surface of the deoxidizing film are obtained; according to the real-time liquid flow and the real-time oxygen content in the deoxygenization membrane, the real-time deoxygenization rate in the deoxygenization membrane is obtained based on a pre-constructed rate and flow relation model; calculating the temperature in the deoxidizing film according to the liquid temperature of the front surface of the deoxidizing film and the liquid temperature of the rear surface of the deoxidizing film; wherein the real-time liquid flow in the deoxidizing film, the liquid temperature of the front surface of the deoxidizing film and the liquid temperature of the rear surface of the deoxidizing film are controlled through a control algorithm; parameters of the control algorithm are parameters of a BP neural network based on particle swarm optimization learning. An automatic control algorithm is adopted for controlling the deoxidizing rate and the deoxidizing film temperature, and the detection precision of the deoxidizing rate and the deoxidizing film temperature can be improved.

This invention provides a high-end vacuum argon-oxygen refining apparatus (VODC furnace) for special metal materials and its refining method, belonging to the technical field of metallurgical refining equipment. It solves the problems of complex structure and high manufacturing and production costs associated with existing VOD furnace vacuum systems. This invention separates the vacuum system from the blowing system through modular design, employs a movable vacuum sealing structure and optimized furnace design, achieving a significant reduction in equipment and production costs. The refining method, by controlling the vacuum degree, oxygen blowing parameters, and stirring intensity, reduces non-metallic inclusions in the steel, achieving a hydrogen content of less than 1.5 × 10⁻⁶. ‑6 Oxygen content less than 2.0 × 10 ‑5 The chromium recovery rate in stainless steel reaches 98%-99%, and the refined steel possesses superior properties. Production efficiency is significantly improved while ensuring product quality. Compared with traditional equipment, this invention reduces equipment investment costs by more than 30%, shortens the refining cycle by 25%, and reduces energy consumption by 20%, making it particularly suitable for small-batch, multi-variety production of high-end specialty metal materials.

The embodiment of the invention discloses an air pre-heater air leakage rate detection method and device and a storage medium. The method comprises the steps that real-time operation parameters of an air pre-heater are obtained through a power plant control system; wherein the real-time operation parameters of the air pre-heater comprise the unit actual load, the air pre-heater outlet oxygen amount, the air pre-heater outlet smoke temperature, the air pre-heater inlet oxygen amount and the air pre-heater inlet smoke temperature; calculating the real-time air leakage rate of the air pre-heater based on the real-time operation parameters; and the real-time air leakage rate of the air pre-heater is compared with an air leakage degree judgment standard obtained based on historical data, and the current air leakage degree of the air pre-heater is determined. According to the technical scheme, the problem that an existing air pre-heater air leakage rate testing technology cannot achieve real-time monitoring and accurate prediction is solved, the real-time air leakage condition of a generator set in actual operation can be truly reflected, and the requirement of a power plant for real-time monitoring of the air pre-heater air leakage rate can be met.

The utility model provides a fairy shrimp temperature control hatching device which comprises a hatching box, a heating plate, a motor, a rotating shaft, blades and a pushing mechanism, the pushing mechanism comprises a sleeve, a piston, a reset spring, a stress block, a pushing rod, a transverse pipe, a vertical pipe and a jet head, and fairy shrimp eggs and hatching liquid can be poured into the hatching box. A proper temperature environment is provided under the action of a heating plate, meanwhile, a motor can drive blades to rotate through a rotating shaft, so that the fairy shrimp eggs are evenly distributed in hatching liquid, in addition, when the rotating shaft rotates, a push rod can make contact with a stress block, a piston is pushed by the stress block to move towards the interior of a sleeve, and when the piston moves, the stress block is pushed into the sleeve. Air in the sleeve can be pushed into the transverse pipe from the vertical pipe, the air spraying head on the transverse pipe can spray the air out, the content of dissolved oxygen in hatching liquid is increased, meanwhile, upward water flow is formed in the hatching liquid, the phenomenon that the eggs of the fairy years sink to the bottom is avoided, it is guaranteed that the eggs of the fairy years can receive proper heat, and the hatching rate is increased.

The utility model belongs to water quality purification technical field provides a kind of purification device, circulating water aquaculture water quality purification system, the device includes by first filter bag, second filter bag and third filter bag that inner layer nest together outward, water flow gap is provided between adjacent filter bag;Water hole is opened on first filter bag, second filter bag and third filter bag, water source entering purification device forms axial-radial-axial flow path in water flow gap by water hole, finally reaches the water purification effect of denitrification and filtration.This purification device can filter organic particulate matter in water source and the whole process device stability is high;And have filtration function and adsorb particulate function;Based on the assembly of purification device, the water oxygen content gradient of the present purification system can be reduced to anaerobic state, thereby causing short-range nitrification reaction to remove nitrogen from water body;And the system has the characteristics of low energy consumption, good purification effect and compact system, thereby reducing the total investment cost.

The invention relates to the field of material surface treatment and machining, in particular to a method and device for directly preparing a copper alloy coating on the surface of a titanium alloy sealing rod. The process comprises the steps that firstly, cleaning and metal powder drying treatment are conducted on a sealing rod base material, and the base material is clamped on a rotary bearing mechanism in an adjusting box body; sealing the adjusting box body and filling inert gas to replace air until the oxygen content reaches the standard; the laser cladding mechanism is controlled to conduct scanning preheating on the surface of the base material in a non-powder-feeding state; then a powder feeding function is started, spiral high-speed laser cladding is carried out in cooperation with rotation of the base material and axial feeding of the cladding assembly, and closed-loop adjustment of the protective gas flow is carried out in the cladding process; and after cladding is completed, the base material is transferred into the heating furnace body in the box body to be subjected to post-treatment slow cooling, laser scanning preheating and in-furnace slow cooling are combined, atmosphere closed-loop control in a closed environment is matched, and the effect of restraining cracking and oxidation of a titanium alloy cladding layer is achieved.

The utility model discloses a kind of ultraviolet light solidification oxygen inhibition inhibiting device, comprising: horizontal transport processing platform, suit sealing support, a pair of hydraulic sealing door, ultraviolet light solidification structure and oxygen inhibition inhibiting structure, the utility model relates to ultraviolet light solidification technical field, full-sealing inert environment control system, adopt double hydraulic sealing door and gas replacement device linkage, realize the oxygen content≤50ppm oxygen-free environment by flow valve accurate control, cooperate with gas detector real-time monitoring, effectively inhibit oxygen inhibition effect, significantly improve the solidification quality of light-cured material surface layer;Multi-dimensional motion adjusting mechanism, longitudinal and transverse two-way positioning system constructed by three-stage screw module, cooperate with the vertical lifting assembly of electromagnetic drive, realize the repeat positioning accuracy of ±0.05mm of spray head group, can be compatible with 50-300mm width range of workpiece adaptive processing.

Method for producing liquid steel in an electric arc furnace with final decarburization The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - melting a metal load in the electric arc furnace (2) for generating a steel bath (10); - denitrogenating the steel bath (10) to reach a nitrogen content %N below a targeted nitrogen content %Ntarg, wherein the carbon content %C remains greater than a targeted carbon content %Ntarg; - applying a final decarburization treatment to reach a carbon content %C ≤ %%Ntarg, to reach an oxygen content %Op greater than 200 ppm, wherein oxygen is injected at a flow rate above 0.3 Nm3 / min / ton, the ambient air being at a pressure of above 90% of the atmospheric pressure; - tapping the steel bath (10), the oxygen content %Op reached by the final decarburization treatment being maintained up to the tapping.