70 results about "Residual oxygen" patented technology

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 discloses a rolling manufacturing method of low-decarburization medium-chromium round steel for a caterpillar track link and a product of the rolling manufacturing method, and belongs to the technical field of alloy steel rolling. The method comprises the following steps: smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.28-0.34% of C, 0.15-0.35% of Si, 0.50-0.85% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.80-1.10% of Cr, less than or equal to 0.30% of Ni, 0.10-0.30% of Mo, less than or equal to 0.30% of Cu, 0.010-0.060% of Al and the balance of Fe and impurities; lF refining, RH vacuum degassing (the time is longer than or equal to 20 min, and the hydrogen content is smaller than or equal to 1.5 ppm), electromagnetic stirring continuous casting (the superheat degree is 15-25 DEG C), slow cooling (longer than or equal to 12 h), segmented heating (the total time is shorter than or equal to 200 min, and the residual oxygen content is lt, 3%), multi-stage high-pressure water descaling (the pressure before finish rolling is 30-35 MPa) and hot continuous rolling (the compression ratio is larger than or equal to 6) are conducted. The total decarburized layer depth of the obtained round steel is smaller than or equal to 0.30 mm, and the round steel has high hardenability, excellent mechanical property and low surface defect rate and is suitable for heavy-load components such as a hydraulic excavator caterpillar track link.

The full-automatic powder packaging equipment with the low residual oxygen content comprises a main machine frame and a packaging bag feeding machine, a main filling mechanism, an air exhaust mechanism, an auxiliary filling machine, a bag opening and edge pressing mechanism and a heat sealing machine are sequentially arranged on the main machine frame, a main conveying line and a weighing belt conveyor are fixedly connected to the main machine frame, the main conveying line is divided into two sections, and the weighing belt conveyor is arranged on the main conveying line. The two main conveying lines are connected with the two ends of the weighing belt conveyor in an end-to-end mode respectively, a vibration assembly is arranged on the main conveying lines and located below the air exhaust mechanism and the bag opening and edge pressing mechanism, and the feeding end of the Y-shaped material box is fixedly connected with an annular inflation pipe. The powder material bagging and filling device has the following beneficial effects that automatic bagging, filling, exhausting and nitrogen filling treatment of powder materials can be achieved, air and powder among the powder materials can be well removed in the packaging process, the residual oxygen amount of packaging is effectively reduced, and the packaging quality is improved.

The application relates to a detection method and system for measuring residual oxygen concentration by laser, and relates to the field of gas concentration detection. The method comprises the following steps: selecting laser with oxygen absorption peak wavelength as detection laser, applying a periodically changed modulation signal to form a modulation laser and irradiate the headspace, demodulating a direct current component from the modulation laser passing through the headspace, calculating a deviation rate according to the direct current component and a reference direct current, judging whether the deviation rate is within a threshold value, feeding back and adjusting the laser wavelength if the deviation rate is not within the threshold value, and finally outputting a laser intensity attenuation curve of residual oxygen to obtain the residual oxygen concentration. The detection system comprises an optical subsystem, an electrical subsystem, a feedback control subsystem and a data processing subsystem. The application can accurately measure the residual oxygen concentration in the headspace, effectively detect and correct the laser wavelength drift, and improve the measurement precision and stability.

The invention relates to a pressure swing adsorption type nitrogen generator and a preparation method, and relates to the technical field of nitrogen preparation, the pressure swing adsorption type nitrogen generator comprises a nitrogen preparation device, the nitrogen preparation device comprises a first adsorption tower and a second adsorption tower which are designed to alternately prepare nitrogen, and gas outlets of the first adsorption tower and the second adsorption tower communicate with each other through a connecting pipeline; the middle part of one side of the connecting pipeline is communicated with a gas outlet pipeline communicated with the nitrogen storage tank, so that two lagging sections are formed between the gas outlet pipeline and the two gas outlets and are used for intercepting nitrogen containing residual oxygen, and the gas outlets of the first adsorption tower and the second adsorption tower are provided with oxygen detection pieces; a reverse pressurizing pipeline communicated with the reverse pressurizing pipeline is arranged between the carbon molecular sieve filling block and the gas outlet pipeline on the other side of the lagging section, and through the reverse pressurizing pipeline, the preparation purity of nitrogen can be improved, the pressure difference can be increased, the desorption rate of the adsorption tower can be increased, and the purity of nitrogen prepared in the next process can be improved.

This invention relates to the field of ferrous metallurgy technology and discloses a method for the reduction production of high-purity, low-oxygen-content sponge iron. The method includes: feeding pellets and reducing materials into a rotary kiln for preheating and forming a metallic iron shell on the surface; pulse-injecting a composite reducing liquid into a high-temperature solid-phase bed in a deep reduction zone; using a rotary encoder for feedback to perform dynamic phase-controlled injection, achieving gas-liquid linkage control and nitrogen cooling maintenance; and collecting the finished product through end-stage homogenization, cooling, and magnetic separation. Ammonia gas generated by the pyrolysis of the composite reducing liquid penetrates the metal layer for deep reduction, and a chemical shielding layer is constructed using boron-carbon bonds formed on the microporous surface of the iron matrix. This invention effectively improves the metallization rate of sponge iron, significantly inhibits secondary oxidation of the finished product during kiln exit and storage, and solves the technical problem of high and unstable residual oxygen content in sponge iron.

The application discloses a kiln production line operation energy consumption data optimization collection and analysis method and system, relates to the technical field of data processing, and comprises the following steps: a kiln car displacement encoder and a pre-buried RFID tag generate a space-time tag; based on the kiln working condition, trigger data collection and obtain pressure fluctuation data; from the pressure fluctuation data, extract the residual oxygen associated component related to the combustion efficiency; when the kiln car enters the rapid cooling area, calculate the deviation of the current rapid cooling area temperature distribution uniformity and the historical reference value, if the deviation exceeds the deviation threshold, then apply the pseudo-random air volume disturbance with the same frequency as the rapid cooling fan; analyze the slope change of the exhaust smoke negative pressure recovery curve and the phase lag amount of the firing zone temperature fluctuation during the disturbance, and generate the air volume redistribution instruction when the slope is greater than the recovery threshold and the phase lag amount exceeds the phase threshold; when the correlation coefficient of the time domain characteristics of the residual oxygen associated component and the residual oxygen concentration change rate exceeds the correlation threshold, output the heat value compensation parameter to the combustion controller.

This invention relates to the field of hydrogen fuel cell technology, specifically to a hydrogen fuel cell exhaust gas moisture removal device. This device connects the residual oxygen connector and residual hydrogen connector of a hydrogen fuel cell and removes moisture from the residual oxygen and residual hydrogen, respectively. It includes a fixed cylinder, a rotating disk, and a rotation drive assembly. By setting a first baffle channel, a second baffle channel, a first guide channel, and a second guide channel within the fixed cylinder, and cooperating with the rotating disk to periodically switch the drying chamber, the problem of insufficient drying and recycling of existing hydrogen fuel cell exhaust gas is solved.

The utility model discloses epinephrine hydrochloride liquid medicine production equipment, and relates to the technical field of liquid medicine filling. Comprising a first nitrogen gas curtain arranged at a post-filling station, a preheating station and a wire drawing and sealing station respectively, the first nitrogen gas curtain is communicated with a nitrogen gas source, and the nitrogen gas source is communicated with a second nitrogen gas curtain and a feeding barrel; the second nitrogen gas curtain is arranged at the weighing station, and the feeding barrel is arranged at the liquid medicine filling station; the first nitrogen gas curtain is used for reducing residual oxygen in the ampoule bottle from operation after filling to operation before wire drawing and sealing; the second nitrogen gas curtain is used for reducing residual oxygen in the weighing barrel; and the feeding barrel is used for batching under the protection of nitrogen. According to the utility model, the second nitrogen gas curtain is used for reducing residual oxygen in the weighing barrel, and the feeding barrel is used for batching under the protection of nitrogen, so that the residual oxygen of raw materials is effectively reduced; and meanwhile, through the first nitrogen gas curtain, the time for exposing the ampoule bottle in the air is greatly shortened, and residual oxygen in the ampoule bottle which runs from the time after filling to the time before wire drawing and sealing is effectively reduced.

The invention particularly discloses a method for increasing the aluminum-silicon ratio through coal gangue anoxic roasting and application of the method, and relates to the technical field of solid waste resource utilization, and the method comprises the steps that coal gangue with the initial aluminum-silicon ratio being 0.8-1.0 is crushed; an assistant A and an assistant B are added into the coal gangue, and the assistant A is prepared by mixing vermiculite powder and a cetyltrimethylammonium bromide solution, performing ultrasonic treatment for 30 minutes, and then compounding and calcining with sodium bentonite; the assistant B is prepared by mixing a borax solution and a cerous nitrate solution, evaporating and crystallizing, drying and grinding; a double-helix conical mixer is adopted for mixing, and 0.5% of deionized water is sprayed; sealing the mixture, introducing nitrogen, and maintaining the residual oxygen content lt; the invention discloses an aluminum-rich material with the aluminum-silicon ratio of 3-5.5, the method comprises the following steps of: heating coal gangue to 400 DEG C at the temperature of 2% under normal pressure, preserving heat, roasting at the speed of 8 DEG C / min, cooling to 200 DEG C, performing coarse crushing and alkali dissolution, filtering, washing, drying and micronizing by jet milling to obtain the aluminum-rich material with the aluminum-silicon ratio of 3-5.5, the method can also be applied to preparation of mullite bricks, 4A molecular sieves and porous ceramic filter materials, the process is simple, the cost is low, and high-valued utilization of the coal gangue is realized.

The invention relates to the technical field of pressure swing adsorption nitrogen making machines, in particular to a pressure swing adsorption nitrogen making machine with an oxygen-enriched tail gas recycling function, which comprises a nitrogen making structure, an inlet and outlet pipeline, a pressure applying structure, an oxygen collecting structure and a communicating vessel, the carbon powder container is filled with screening carbon powder; the two ends of the air inlet and outlet pipe are communicated with the upper ends of the two groups of adsorption tanks; the pressing structure is fixedly mounted between two ends of the air inlet-outlet pipe; the oxygen collecting structure comprises a recycling pipe; two ends of the recycling pipe are communicated with the lower edges of the side surfaces of the two groups of adsorption tanks; two ends of the communicating device are communicated with the bottoms of the two groups of adsorption tanks. According to the device, gas in the two adsorption tanks flows in a reciprocating manner through the pressure applying structure, the air is stirred, oxygen on the inner layer is effectively turned out and continuously passes through the carbon molecular sieve, the separation efficiency of oxygen and nitrogen is remarkably improved, and the content of residual oxygen in the nitrogen is reduced.

According to the method for preparing the battery-grade iron phosphate through magnetite and reduction leaching, hydroquinone and ascorbic acid are added into the leaching agent phosphoric acid aqueous solution to serve as a reducing agent together, on one hand, hydroquinone and ascorbic acid have high reducibility, and the phenomenon that the iron source is damaged at the moment when the iron source makes contact with the leaching agent can be avoided; fe < 2 + > released by the magnetite is oxidized into Fe < 3 + > by residual oxygen in the liquid phase, and the reaction path of oxidizing Fe < 2 + > into Fe < 3 + > in the liquid phase is thoroughly blocked, so that the reaction of the elemental iron and the target Fe < 3 + > is promoted; and on the other hand, under the acidic condition, hydroquinone and ascorbic acid can form complexes [Fe (C6H4 (OH) 2)] < 2 + > and [Fe (C6H7O6)] < 2 + > with Fe < 2 + > in a leaching system respectively, the concentration of Fe < 2 + > in a liquid phase is reduced, reaction balance forward movement of ferrous ions released by magnetite is promoted, and the leaching rate of the iron element is greatly increased.

The invention discloses a cold annealing and pickling method for 430 ferritic stainless steel, belongs to the field of ferrous metallurgy production, and solves the problem that oxide skin is easy to form on the surface of 430 ferritic stainless steel strip steel. The method comprises the following steps of: removing residual rolling oil on the surface of the 430 ferrite stainless steel strip steel in a degreasing section procedure; an annealing furnace temperature control mode is adopted, furnace pressure control of the annealing furnace is stabilized according to the thickness of the strip steel, and the residual oxygen amount of the five heating sections is controlled to be 0.05% or below; and an electrolytic neutral salt section procedure: adopting an electrolytic negative plate made of a stainless steel material, controlling the pH value of the electrolyte to be 3-4, increasing the long circulation volume of neutral salt, and measuring the density of the electrolyte on site. The defects of yellow spots, whitening and the like on the surface of strip steel during cold annealing and pickling production of 430 stainless steel are overcome; the atmosphere of the annealing furnace is stabilized, and the high-temperature section generates the reducing atmosphere by adjusting the air consumption coefficient. Therefore, continuous oxidation of the high-temperature section is restrained.

The invention discloses wear-resistant modified graphene lubricating oil and a preparation method thereof, and belongs to the technical field of lubricating oil, the wear-resistant modified graphene lubricating oil comprises the following raw materials: alkyl naphthalene base oil, sodium stearate, an antioxidant 5057, an organic silicon defoamer, polyisobutylene succinimide and a wear-resistant modified graphene additive; gamma-glycidyl ether oxypropyl trimethoxy silane is used for modifying graphene oxide in advance, accumulation between graphene sheet layers can be effectively prevented, agglomeration is avoided, then reduction is performed through vitamin C, residual oxygen-containing functional groups are removed, a conjugated structure is recovered, epoxy groups are reserved, and different from traditional hydrothermal synthesis, the preparation method has the advantages that the preparation method is simple, and the preparation cost is low. The graphene oxide and the carbon quantum dots only have physical adsorption, so that the graphene oxide and the carbon quantum dots can be prevented from falling off in high-pressure, strong-shearing-force and local high-temperature environments in the friction process, and the antifriction effect can be stably exerted for a long time.

This invention belongs to the field of annealing furnace technology, specifically an annealing atmosphere control component, an annealing furnace, and its usage method. Addressing the problems of low gas replacement efficiency, poor sealing, and safety hazards during furnace opening in traditional equipment, the following technical solution is proposed: Liftable furnace doors are provided on both sides of the furnace body, forming a sealed cavity with the trolley; the annealing atmosphere control structure includes a dual-gas box system, with protective gas injected from the furnace bottom via a gas guide pipe, utilizing density differences to form a stable upward airflow; the sealing structure achieves a complete seal between the furnace body, trolley, and furnace door through a combination of annular sealing strips and double-layer bottom sealing strips; the protective structure uses a damping rotating shaft-linked arc-shaped protective plate that automatically unfolds to form a safety barrier when the furnace is opened; this device, through optimized gas flow path, multi-stage sealing design, and combined furnace opening protection, effectively reduces residual oxygen content, prevents gas leakage, and ensures operational safety, making it suitable for high-precision metal annealing.

The invention relates to the field of metallurgy, in particular to a smelting method of high-purity high-carbon bearing steel GCr15, the process route comprises KR molten iron pretreatment, BOF converter primary smelting, VD vacuum treatment, LF refining and continuous casting, the refining desulfurization burden is relieved through KR molten iron pretreatment, and the lower sulfur content of a finished product is achieved; weak deoxidation is adopted in the BOF converter, Al deoxidation is not used, excessive turning of molten steel is avoided, and oxidability is controlled; molten steel directly enters VD after BOF tapping, and carbon in the molten steel reacts with residual oxygen in the molten steel and unstable oxides in steel slag under high vacuum of VD; the molten steel is further deoxidized, alloyed, heated, softly blown and stood in the LF; molten steel is subjected to protective casting in a continuous casting machine. According to the method, the aluminum consumption of the high-carbon bearing steel GCr15 in the whole process is smaller than or equal to 0.3 kg / t steel, continuous and stable casting is achieved, and the total oxygen content of the steel is smaller than or equal to 0.0006%.

The utility model relates to a double -sealed plug -in filling nitrogen head structure. Include: filling nitrogen head body, plug -in rod and drive mechanism, the bottom of filling nitrogen head body is provided for with the sealed part of container mouth part sealed, be equipped with first sealing assembly in sealed part, plug -in rod penetrates filling nitrogen head body and lower extreme setting is used for with the second sealing assembly of filling nitrogen head body top sealed, form upper and lower double -sealed structure, plug -in rod upper extreme is connected with drive mechanism, under the action of drive mechanism along filling nitrogen head body axis direction removes, realize first sealing assembly and the compression sealing of container mouth part and the close -fitting sealing of second sealing assembly and filling nitrogen head body. Form double -sealed through upper and lower two layers sealing assembly, compared with traditional single -sealed structure, gas leakage rate reduces 90% or above, ensures residual oxygen content steady control below 1%.

The invention provides a special dissolved oxygen detector for in-situ leaching uranium mining and a dissolved oxygen detection method. The special dissolved oxygen detector for in-situ leaching uranium mining comprises a pressure-resistant machine body, a water-gas separation membrane, a detection assembly, an air blowing assembly and a matched controller, the pressure-resistant machine body is provided with a measuring air chamber, and the outer wall is provided with a passing opening communicated with the measuring air chamber; the water-gas separation membrane is arranged in the through hole and is used for only allowing oxygen to pass through and enter the measuring gas chamber; the detection assembly is arranged in the pressure-resistant machine body, is provided with a detection part extending into the measuring gas chamber, and is used for detecting the oxygen content in the measuring gas chamber; the air blowing assembly is provided with an air inlet end and an air outlet end which are communicated with the measuring air chamber; the gas inlet end is used for introducing nitrogen into the measuring gas chamber so as to discharge oxygen out of the measuring gas chamber; the gas outlet end is used for pumping out nitrogen and residual oxygen in the measuring gas chamber; the controller is electrically connected with the detection assembly. The special dissolved oxygen detector for in-situ leaching uranium mining can detect the concentration of dissolved oxygen in real time in an underground high-pressure environment.

The application discloses a hafnium chloride automatic packaging equipment, which comprises a glove box in which inert gas can be filled, the glove box comprises a transfer cavity and a main cavity, the transfer cavity is an independent cavity body and is arranged at a feeding end of the main cavity; the transfer cavity comprises a vacuum cavity and a plurality of cleaning cavities in sequence along the length direction of the main cavity, and the tail cleaning cavity is communicated with the main cavity. By arranging the independent transfer cavity, the transfer cavity comprises the vacuum cavity and the plurality of cleaning cavities in sequence along the length direction of the main cavity, and is provided with a first air isolation door, a second air isolation door and a vacuumizing assembly, so that a multi-stage material purification buffer zone is jointly constructed. After the material bottle is sent into the transfer cavity through the first conveying element, the material bottle firstly enters the vacuum cavity, the vacuumizing program is started after the second air isolation door is closed, most of the gas and moisture are effectively removed, then the material bottle sequentially passes through the plurality of cleaning cavities, and the circulating purification process of "vacuumizing-inert gas filling" is repeated in each stage cavity, so that the residual oxygen and moisture in the surface and the environment are gradually removed.

The invention discloses a method for removing oxide skin on the surface of an invar alloy hot-rolled coil, which adopts the processes of unwinding, pre-pressing, primary acid pickling, primary rinsing, secondary acid pickling, secondary rinsing, drying, coiling and grinding, can remove the oxide skin on the surface of the invar alloy hot-rolled coil, and improves the surface quality of the invar alloy hot-rolled coil. And defects such as oxygen residues on the surface of the subsequent cold-rolled strip are avoided.

The invention provides a system for pyrolysis, comprising: (i) a gas producer comprising a gasification zone and a producer gas outlet, wherein the gas producer is configured to: oxidise at least one carbon-containing feed in the presence of an oxidising gas in the gasification zone to form a producer gas; and discharge the producer gas from the gasification zone via the producer gas outlet, wherein a residual oxygen content of the producer gas is substantially depleted or maintained below a maximum predetermined amount by controlling a ratio of oxygen fed to the gasification zone to the carbon-containing feed, (ii) a pyrolyzer comprising a pyrolysis zone and one or more pyrolyzer gas outlets, wherein the pyrolyzer is configured to: feed the producer gas discharged from the gasification zone to the pyrolysis zone; pyrolyze a pyrolyzable organic feed in the pyrolysis zone in the presence of the producer gas to produce a carbonaceous pyrolysis product and a gas mixture comprising combustible components comprising pyrolysis gas; and discharge the gas mixture from the pyrolysis zone via the one or more pyrolyzer gas outlets, and (iii) a first combustor comprising a combustion zone, wherein the first combustor is configured to: receive the gas mixture discharged from the pyrolysis zone in the combustion zone; feed an oxygen-containing gas to the combustion zone; and combust at least a portion of the combustible components present in the gas mixture in the combustion zone to produce a combustion product gas.

The invention relates to the technical field of gas treatment in the ferrous metallurgy industry, in particular to a hydrogen-nitrogen mixed gas recycling device for an oriented silicon steel decarburization annealing line. According to the technical scheme, the hydrogen-nitrogen mixed gas recycling device for the oriented silicon steel decarburization and annealing line comprises a recycling device body, a gas inlet treatment unit, an impurity treatment assembly, a discharging unit, a catalytic reaction pipeline and a catalyst spray head, and the gas inlet treatment unit is arranged on one side of the interior of the recycling device body; according to the invention, the noble metal catalyst is added at the gas discharge end, so that efficient purification and cyclic utilization of the hydrogen-nitrogen mixed gas are realized. A catalytic reaction pipeline and a catalyst spray head are integrated in the discharge unit, carbon monoxide and residual oxygen in mixed gas are converted into carbon dioxide and water, the problem that chemical impurities in the gas are not thoroughly removed is effectively solved, high-temperature or complex chemical reactions are not needed, and the treatment efficiency and the gas purity are improved.

1. The name of the design product: laser headspace soft bag residual oxygen detection machine. 2. The use of the design product: the design product is used for detecting residual oxygen in the empty soft bag. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

The invention discloses a rolling manufacturing method of low-decarburization round steel for a high nickel-chromium-molybdenum alloy caterpillar track link section, and belongs to the technical field of alloy steel manufacturing. The method comprises the steps of electric furnace smelting, LF external refining, RH vacuum degassing (the time is longer than or equal to 20 min, and the hydrogen content is smaller than or equal to 1.5 ppm), electromagnetic stirring continuous casting (the superheat degree is 15-25 DEG C), slow cooling (longer than or equal to 12 h), segmented heating (the total time is shorter than or equal to 200 min, and the residual oxygen content is lt, 3%), four-stage high-pressure water descaling (the pressure before finish rolling is 30-35 MPa) and hot rolling (the compression ratio is larger than or equal to 6, and the finish rolling temperature is 850-900 DEG C). The total decarburized layer depth of the obtained round steel is smaller than or equal to 0.22 mm, the hardness HRC of the position 11.5 mm away from the quenching end is 51-55, the austenite grain size is larger than or equal to the fifth level, the surface crack rate is smaller than or equal to 5%, and the fatigue life is larger than or equal to 500,000 times. The round steel comprises the following chemical components in percentage by mass: 0.29 to 0.35 percent of C, 0.15 to 0.35 percent of Si, 0.60 to 0.90 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, 1.60 to 2.00 percent of Ni, 0.60 to 1.00 percent of Cr, 0.15 to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, 0.015 to 0.070 percent of Al and the balance of Fe and impurities. The method is suitable for industrial production of the hydraulic excavator caterpillar track link.

The invention discloses a pretreatment method of a sample for detecting nutritional ingredients of a whole poultry body, which comprises the following steps: detecting the temperature of different parts of a frozen whole poultry, identifying substandard parts, performing supplementary freezing, and performing slitting according to partition freezing degree distribution; in the drying process, a temperature sequence is monitored to recognize and regulate abnormal points, the surface layer and center moisture content is detected to calculate the gradient, low-temperature delay treatment is conducted on a sample with the gradient exceeding the standard, and the drying end point is judged by combining moisture content data and the moisture content gradient; carrying out stratified sampling on the coarsely crushed sample, detecting the component proportion and particle size distribution, determining superfine crushing process parameters, and carrying out liquid carbon dioxide assisted superfine crushing and recycling; and performing multi-point sampling on the mixed sample, evaluating the uniformity, detecting the oxygen concentration of each layer, determining residual oxygen concentration data, determining filling parameters of recovered carbon dioxide, and sealing. According to the method, accurate matching of process parameters and cyclic utilization of carbon dioxide are realized, a pretreatment sample with uniform components and stable oxidation is obtained, and the requirements of analysis and detection on sample representativeness and stability are met.

The invention relates to the field of heating furnace monitoring and control, in particular to a steel rolling heating furnace residual oxygen optimization control method and system.The method comprises the steps that historical variables and future control variables of operation of a heating furnace are collected, collected data are preprocessed, and an input sequence and an output sequence are constructed; an encoder-decoder structure is adopted, space attention and time attention are integrated, multivariable coupling and time variation are captured, the residual oxygen content in a future time domain heating furnace is predicted, and a sequence-to-sequence Seq2Seq prediction model of a space-time dual attention mechanism is constructed; the prediction model is combined with a model prediction control method, a residual oxygen prediction sequence is used as input, a multi-objective optimization problem is constructed, under the constraint conditions of the air-fuel ratio, the flow, the temperature and the like, the optimal control sequence is solved, only the first control action is executed, rolling iteration is conducted, and prospective and high-precision closed-loop control over the residual oxygen content in the heating furnace is achieved. Global optimization is achieved, the oxidation burn-out rate of the steel billet is reduced, energy consumption is stabilized, and energy is saved.

According to the pulse type oxygen-enriched combustion control method for the heat accumulating type heating furnace, preconditions for oxygen-enriched starting of the heat accumulating type heating furnace are added, a series of linkage conditions and logic judgment conditions are set for starting and stopping of an oxygen lance, and before the oxygen lance is started, a burner quick switching valve and the residual oxygen concentration are judged. The technical problem that an existing conventional combustion heating furnace oxygen-enriched combustion control technology is difficult to meet the oxygen-enriched combustion safety control requirement of a heat storage type heating furnace can be solved.

The application belongs to the technical field of copper cable processing, and specifically discloses a device for preparing copper flat wire by means of copper cable extrusion forming, which comprises a treatment box, an extrusion mechanism is arranged on one side of the treatment box, a connecting cavity is formed in the treatment box, and guide holes are formed in the two sides of the treatment box; by arranging the annealing module and the treatment box, a closed protection gas circulating system with internal gas pressure higher than that of the outside can be constructed, and oxygen molecular sieves are integrated, so that double antioxidation guarantee is provided for the copper cable annealing process, high-purity nitrogen gas is injected from the air inlet pipe, and an inert environment is formed in the rapid cooling cavity; secondly, the residual oxygen in the circulating gas can be filtered by the oxygen molecular sieves during the flow of the circulating gas in each cavity, trace oxygen contained in the input protection gas can be effectively intercepted, contact between the copper cable and oxygen is effectively avoided during the whole annealing process, the surface of the copper flat wire is ensured to be bright and clean, the product quality is improved, and a subsequent pickling process is saved.

The utility model relates to the technical field of glass firing, and discloses an efficient combustion device for controlling residual oxygen of a glass kiln, which comprises a base and a fixing plate, the top end of the base is fixedly connected with a combustion box, the left side of the top end of the base is fixedly connected with two fuel residual oxygen bottles, and an air delivery pump is arranged outside the fuel residual oxygen bottles. The driving end of the air conveying pump is fixedly connected with connecting pipes, flow valves are arranged on the sides, close to the air conveying pump, of the connecting pipes, the close sides of the two connecting pipes are fixedly connected with a mixing pipe, and the interior of the mixing pipe is fixedly connected with a plurality of first baffles. According to the utility model, accurate control of flow of fuel and oxygen is realized, and the fuel and the oxygen are fully mixed and then enter the heating cavity, so that an ideal combustion state is achieved. Meanwhile, harmful gas in the waste gas is effectively adsorbed through multiple times of filtration, the filter screen or the filter bag is convenient to clean and replace, and the waste gas treatment effect and the continuity of the system are ensured.

The utility model discloses a prefabricated dish fresh -keeping packaging machine relates to food processing technical field, and the utility model discloses a conveying frame, and the conveying frame includes the conveyer belt, and the outer surface detachable of conveyer belt is provided with the baffle, and the top of conveyer belt is provided with the casing, and the bottom surface of casing is inserted and is provided with the heat -seal plate, and the end surface fixedly connected with the supporting plate of casing, and the side wall of one supporting plate is provided with the notched, and the inside sliding connection of notched has the toothed plate, and the side wall of toothed plate is engaged with the gear, and the middle part fixedly connected with the cross shaft of the side wall of gear is inserted, and the shaft end fixedly connected with the cross pipe of cross shaft is, and the output fixedly connected with the nitrogen filling pipe of cross pipe, the utility model discloses, can carry out fresh -keeping packaging to prefabricated dish, avoid the residual oxygen in the packing bag and lead to the oxidation metamorphism of prefabricated dish, and can automatically make the nitrogen filling pipe and the bag mouth of packing bag separate after completing the packaging, avoid the influence packing bag's removal, thereby improve work efficiency.