328 results about "Pure oxygen" patented technology

The invention discloses a fluoride salt-free nitrate-free cast iron enamel semitransparent glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, zinc oxide, lithium carbonate, zirconium silicate, titanium dioxide, aluminum oxide, trisodium phosphate, antimony oxide, magnesium carbonate and barium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and low-temperature firing adaptability, and is suitable for cast iron matrixes, the firing temperature is 740-760 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride-salt-free and nitrate-free medium-temperature semitransparent glaze for steel plate enamel as well as a preparation method and application of the medium-temperature semitransparent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, potassium feldspar, anhydrous borax, sodium carbonate, titanium dioxide, monopotassium phosphate and zinc oxide according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 800-840 DEG C and the firing time of 20-30 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride-salt-free and nitrate-free high-temperature acid-resistant translucent glaze for steel plate enamel as well as a preparation method and application of the translucent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, titanium dioxide, trisodium phosphate, potassium carbonate, lithium carbonate, aluminum oxide, zinc oxide and sodium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 840-880 DEG C and the firing time of 820-830 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride salt-free and nitrate-free low-temperature matte glaze for steel plate enamel as well as a preparation method and application of the low-temperature matte glaze, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, sodium carbonate, titanium dioxide, magnesium oxide, monopotassium phosphate, calcium carbonate, zinc oxide, magnesium carbonate, lithium carbonate, aluminum oxide and zirconium silicate according to a specific mass ratio. The preparation method comprises the following steps: mixing the raw materials, melting at 1300 + / -10 DEG C in a pure oxygen environment, and quenching after wiredrawing to detect a molten state. The matte glaze completely avoids the use of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are eliminated from the source, the fluorine content of the product is not detected through detection, and the limit value requirements of European Union REACH regulations are met. Zinc oxide and ZnO / TiO2 are added, so that the liquid phase viscosity is reduced, ion diffusion is accelerated, and the opacity (opacification performance) and gloss of the porcelain glaze are enhanced.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel zirconium white glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The zirconium white glaze is prepared from quartz, borax pentahydrate, magnesium carbonate, potassium carbonate, potassium feldspar, zinc oxide, aluminum hydroxide, calcium carbonate, zirconium silicate, sodium tripolyphosphate and lithium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The zirconium white glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, and meanwhile, the zirconium white glaze has good porcelain surface, luster and firing adaptability, is suitable for cast iron matrixes, has the firing temperature of 740-760 DEG C and the firing time of 87-87 hours, and can be widely applied to cast iron substrates. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride-salt-free and nitrate-free low-temperature pearlescent glaze for steel plate enamel as well as a preparation method and application of the pearlescent glaze, and belongs to the technical field of enamel. The pearlescent glaze is prepared from quartz, anhydrous borax, titanium dioxide, magnesium carbonate, sodium tripolyphosphate, potassium carbonate, lithium carbonate, potassium feldspar, zinc oxide and V-26 according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The pearlescent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the pearlescent glaze has good porcelain surface, luster and low-temperature firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 760-800 DEG C and the firing time of 10-20 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses fluoride-salt-free and nitrate-free low-temperature acid-resistant translucent glaze for steel plate enamel as well as a preparation method and application of the translucent glaze, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, titanium dioxide, trisodium phosphate, potassium carbonate, lithium carbonate, aluminum oxide, zinc oxide and sodium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and low-temperature firing adaptability, and is suitable for steel plate substrates, the firing temperature is 760-800 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.

The utility model relates to a raw gas source upgrading system for an internal heating type vertical furnace. The raw gas source upgrading system comprises a dry distillation furnace, a carbon dioxide removal device and a pure oxygen preparation device, the device further comprises a first multi-stage mixer, a second multi-stage mixer, a gas sampling analysis tube and a gas component detector. Pure oxygen is adopted as a combustion improver, so that the content of nitrogen in the raw gas is greatly reduced, and the application scene of coal gasification production and deep processing of the internal heating type vertical furnace is expanded; the components of combustion-supporting gas, combustible gas and inert gas in mixed gas in a lattice wall of the dry distillation furnace are controlled by adopting double-circulation control of carbon dioxide and recirculated gas, the combustion intensity and the uniformity degree are strictly controlled under the condition that dry distillation heat supply is met, and scabbing and burning loss of a dry distillation furnace body are avoided.

The application discloses a device and method for preparing green hydrogen through biomass pyrolysis and gasification, relates to the technical field of green hydrogen preparation, and solves the problems of blockage and corrosion caused by ash melting and slagging in the pure oxygen gasification process, and the problem of low energy utilization rate. The device for preparing green hydrogen through biomass pyrolysis and gasification comprises a pyrolysis reaction device, and the pyrolysis reaction device comprises a pyrolysis reaction tank connected with a high-temperature heat carrier conveying spiral, a biomass raw material storage bin, a biomass raw material conveying spiral and a pyrolysis solid-phase product conveying spiral. In the application, biomass raw materials are converted into biochar and pyrolysis oil gas through pyrolysis technology, the biomass ash is effectively cut, and problems such as blockage and corrosion caused by ash melting and slagging in the pure oxygen gasification process are effectively avoided; the high-temperature pyrolysis oil gas is directly subjected to pure oxygen gasification reaction through gasification technology, the sensible heat and latent heat in the pyrolysis oil gas are fully utilized, and the energy utilization rate is high.

Pure liquid nitrogen, liquid air or dirty liquid nitrogen generated by a rectifying tower of the air separation device is subjected to secondary pressurization through a hydraulic pump and then enters a main heat exchanger or a recooling device to recover cold energy, and high-pressure gas formed by heat absorption and gasification enters a high-pressure expansion machine to expand and do work; exhaust gas of the high-pressure expansion machine enters the rectifying tower to provide cold energy required by air separation, and pure nitrogen, waste nitrogen and pure oxygen which are discharged from the rectifying tower and are subjected to cold energy recovery through the main heat exchanger are output. The purposes of energy conservation and consumption reduction of the air separation device are achieved through the processes of primary pressurization of the compressor, secondary pressurization of the hydraulic pump, cold returning, gasification and expansion.

The invention relates to a pure oxygen pulverized coal burner which comprises a pulverized coal bin, a pulverized coal conveying cylinder, an oxygen header pipe, oxygen spray pipes and burner blocks. The oxygen spray pipe and the pulverized coal conveying cylinder extend into the burner block; a pulse valve is arranged on the oxygen spraying pipe, an accumulation groove and a pulverized coal striking head are arranged at the tail end of the pulverized coal conveying barrel, pulverized coal falls into the accumulation groove through conveying of the pulverized coal conveying barrel, and the pulverized coal striking head is connected with a striking head driving motor through a striking head transmission shaft to rotate at a high speed to strike the pulverized coal falling into the accumulation groove. Compared with the prior art, the pulse jet oxygen is supplied after the pulverized coal is scattered and scattered, so that the torch time is effectively shortened, and the thermal radiation of a continuous combustion torch to a nozzle is eliminated to a great extent. The supply of the pulverized coal and the supply of the oxygen can be flexibly controlled through the opening and closing interval time of the valve, and the power of the combustor can be conveniently adjusted according to the required furnace temperature and heat supply amount, so that the oxygen and the pulverized coal can be fully and uniformly mixed regardless of the power, and the optimal air-fuel ratio is achieved.

The utility model provides a combined heat and power supply air supply system of a fuel cell, which utilizes a byproduct high-pressure pure oxygen generated by hydrogen production through water electrolysis as a working fluid, realizes air humidification and cyclic utilization of electric pile waste gas through combination of an injection device and an air compressor branch, reduces the use of a humidifier and an intercooler, and reduces the complexity and air flow resistance of the system. The system comprises an air inlet main path, an oxygen inlet branch path, an air inlet branch path and an injection device, waste oxygen is introduced into the oxygen inlet branch path, the air inlet branch path is provided with an air compressor, and the injection device mixes the waste oxygen and fresh air and supplies the mixed waste oxygen and fresh air into a galvanic pile. The air outlet pipeline is connected with the water segregator, waste gas is recycled to humidify fresh air, and a backflow adjusting valve is arranged. The system reduces the power consumption of the air compressor and improves the cogeneration efficiency of the fuel cell.

The utility model discloses a submerged pure oxygen oxygenation water pushing device, which relates to the technical field of oxygenation devices, and comprises a device body, a water inlet, a water outlet and a water outlet, an atomizing assembly is fixedly mounted on one side of the water-oxygen mixing cavity, and a water pushing assembly is fixedly mounted on the other side of the water-oxygen mixing cavity; the atomization assembly is communicated with the water inlet; the air vent is communicated with the water-oxygen mixing cavity; the water-oxygen mixing cavity is used for mixing water and oxygen introduced from the air vent to obtain oxygen-dissolved water; the atomizing assembly comprises an atomizing pipeline and a plurality of atomizing nozzles, and the atomizing nozzles are used for atomizing water; the air vent can exhaust air and is connected with an air supply device; and the water inlet can be connected with a water supply device. The oxygen dissolving device is mainly used for avoiding waste of oxygen in the oxygen dissolving process and improving the oxygen dissolving efficiency and the oxygen content of a water body.

The application discloses a method for improving critical current of REBCO superconducting layer and relates to the technical field of superconducting materials.The method for improving critical current of REBCO superconducting layer comprises the following steps: REBCO superconducting tapes are annealed in a pure oxygen atmosphere, quenched to 20-25 DEG C, and then the surface silver layer is removed by a chemical method, after which the REBCO superconducting tapes are annealed in a mixed atmosphere of ozone and oxygen, and a protective layer is deposited, so that the critical current of the REBCO superconducting layer is finally improved.The carrier concentration of the REBCO superconducting tapes can be effectively controlled through the specific multi-step oxidation process, so that the REBCO superconducting tapes break through the under-doped state commonly existing in the prior art, reach the over-doped level, and then the critical current performance of the tapes is significantly improved.The method has simple process, high stability and high industrial feasibility, and can meet the demand of higher current-carrying capacity of REBCO tapes in key fields such as power transmission and high-field magnets.

The utility model discloses a full water jacket pure oxygen continuous gasification furnace, which relates to the technical field of gasification furnaces and comprises a gasification furnace main body, the top of the gasification furnace main body is provided with an automatic stoker, a hydraulic coke detector, a radar coke detector and a gas outlet pipe, and the side end face of the gasification furnace main body is provided with an upper water jacket and a lower water jacket. A fire grate is arranged at the bottom of the inner end face of the gasification furnace body, a central air bellow, an ash discharging assembly and a fire bar machine assembly are arranged at the bottom of the gasification furnace body, a feeding hopper is arranged at the top of the automatic stoker, a discharging opening is formed in the bottom of the automatic stoker, and a secondary distributor is arranged in the discharging opening. The gasification furnace has the advantages of high efficiency, stability, environmental protection and energy conservation, and solves the problems of'blow-over 'and'cavity' phenomena caused by unreasonable height-diameter ratio design of a traditional gasification furnace and carbon layer height fluctuation caused by a single ash discharge port.

The application discloses a cast iron enamel high-temperature matte glaze without fluorinated salt and nitrate, and a preparation method and application thereof, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, titanium dioxide, sodium carbonate, calcium carbonate, barium carbonate, aluminum oxide, sodium tripolyphosphate, potassium carbonate and lithium carbonate according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1300+ / -10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The matte glaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, and the fluorine content of the product is not detected through detection, thereby meeting the limit value requirements of the EU REACH regulation. Meanwhile, the matte glaze has good enamel surface, excellent firing performance and matte performance, is suitable for a cast iron substrate, has a firing temperature of 780-800 DEG C, and can be used for the production of green and environmentally-friendly enamel products.

This invention discloses an O3-phase high-entropy layered oxide cathode material, its preparation method, and its application, belonging to the technical field of sodium-ion battery cathode materials. The O3-phase high-entropy layered oxide cathode material has the chemical formula NaNi. 1‑ 8x Ca x Co x Al x Fe x Mn x Si x Ti x Zr x O2, x = 0.05~0.1. Raw materials are weighed according to stoichiometric ratio, mixed, and pulverized to obtain precursor powder. The precursor powder is then sintered in a pure oxygen atmosphere to obtain a first sintered product, which is then pulverized again. The pulverized product is then sintered in a pure oxygen atmosphere for a second step, and after cooling, an O3 phase high-entropy layered oxide cathode material is obtained. Sodium-ion batteries assembled based on this cathode material exhibit excellent high-rate performance and long-cycle stability.

A method for smelting high-proportion sefstromite by using an oxygen blast furnace. The method comprises the following steps: with pure oxygen blowing being used in a blast furnace, injecting pure oxygen, hot coal gas and pulverized coal from a tuyere, adding an iron charge and coke from the top of the furnace, wherein the volume percentage of N2 in coal gas at the top of the furnace is less than 25%, removing CO2 from the coal gas at the top of the furnace, and then recycling same. The method for smelting high-proportion sefstromite by using an oxygen blast furnace in the present invention can achieve such smelting that the proportion of sefstromite in the blast furnace is greater than 60%, the mass fraction of TiO2 in blast-furnace slag is greater than 15%, but smaller than 45%, and the emission of CO2 is reduced by 30% or more, and solves the problems of thick furnace slag, difficulties in slag-iron separation, blast wandering, high costs, high carbon emissions, etc., of conventional blast furnace smelting in the case of an increase in the proportion of sefstromite, thereby achieving higher utilization efficiency of vanadium-titanium resources, lower smelting costs and lower carbon emissions.

A RedOx furnace and process is provided for regenerating a spent sulfuric acid stream or other sulfur-containing stream by decomposing the spent sulfuric acid stream and / or other sulfur-containing stream to recover sulfur dioxide from the streams. The RedOx furnace includes a reduction chamber having an interior atmosphere, an oxidation chamber having an interior atmosphere positioned downstream from, and in fluid communication with, the reduction chamber, an inlet for supplying a spent sulfuric acid stream or other sulfur-containing stream into the interior atmosphere of the reduction chamber, and an inlet for supplying a pure oxygen stream into the interior atmosphere of the reduction chamber.

The invention relates to the field of diamonds for ultra-precision cutting, in particular to a production method of a spontaneous heating single crystal diamond for an ultra-precision machining cutter, the cutter and an ultra-precision cutting method. The invention relates to a production method of a self-heating single crystal diamond for an ultra-precision machining cutter. The production method comprises the following steps: S1, providing a high-quality single crystal diamond with a crystal orientation inclination angle of 45-55 degrees as a seed crystal; s2, a hydrogen plasma atmosphere with the hydrogen flow being 500 + / -10 sccm is constructed, and carbon source gas, boron source gas, oxygen, nitrogen and argon are introduced; s3, continuously depositing on the surface of the seed crystal for at least 300 hours to obtain a deposited monocrystal diamond with the thickness of not less than 1.1 mm; and S4, carrying out heat treatment on the synthesized sedimentary-state single crystal diamond in a pure oxygen environment to obtain the single crystal diamond of which the resistivity is 0.8-2.0 omegam and which can automatically heat to 200-500 DEG C under the action of a Joule heat effect after variable current is introduced. By means of self-heating of the single crystal diamond, under the condition that an external thermal field is not needed, precise space confinement, quick response and fine regulation and control of a cutting micro-area thermal field can be achieved when the single crystal diamond is used for a cutter, and ultra-precise cutting machining of the optical-grade surface of a hard and brittle material can be conveniently achieved.

A pressurized gasification device adopting heat storage and supply comprises a pure oxygen pipe, a pulverized coal pipe, a cyclone combustion cylinder, a heat storage device I, a heat storage device II, a gasification agent pipe, a temperature detector, a high-pressure fan, a gasification agent nozzle, a gasification furnace, a gasification furnace grate, a coal bunker, a coal lock, a coal lock upper valve, a coal lock lower valve, a chilling chamber and a slag pool. High-temperature flue gas generated by pure oxygen combustion of pulverized coal enters the heat storage device for heat storage, heat is transmitted to a gasifying agent and then is fed into the gasification furnace, the situation that conventional air combustion influences the efficiency of the gasification furnace and direct combustion of lump coal in the gasification furnace is avoided, the operation cost of the gasification furnace is reduced, meanwhile, heat is provided for the gasification furnace in an external heat supply mode, and energy is saved. The operation flexibility of the gasifier is improved.

This invention provides nano-tungsten carbide and its preparation method. The preparation method includes: providing ammonium paratungstate; calcining the ammonium paratungstate to form purple tungsten; oxidizing the purple tungsten in pure oxygen to form yellow tungsten; ball milling the yellow tungsten with carbon, then isostatically pressing it into a block, followed by carbon reduction to obtain a tungsten-carbon mixed block; carbonizing the tungsten-carbon mixed block, and then crushing it to obtain nano-tungsten carbide powder. This invention can reduce the manufacturing cost of nano-tungsten carbide and is beneficial for preparing finer tungsten carbide powder.

The application relates to the field of thermal catalysis, and discloses a method for preparing 1-cyclohexylbenzene hydrogen peroxide by solvent-free thermal catalytic selective oxidation of cyclohexylbenzene with molecular oxygen. The method uses a metal bromide as a catalyst, azobisisobutyronitrile or t-butyl hydroperoxide as an initiator, and pure oxygen as an oxidant, and can effectively selectively oxidize cyclohexylbenzene (CHB) into 1-cyclohexylbenzene hydrogen peroxide under normal pressure, solvent-free conditions and at a temperature above 90 DEG C. The catalytic system has the advantages of low cost, simple operation process, high catalytic oxidation efficiency and high selectivity of the target oxidation product.

The application discloses a CO2 capture method and system based on fuel staged conversion coupled with chemical looping combustion, and the method comprises the following steps: flue gas is introduced into a carbonation tower filled with metal oxygen carriers MeO and adsorbents A, the adsorbents A adsorb CO2 in the flue gas, and then the solid in the tower is transported to a calciner; the adsorbents A after adsorption are decomposed into the adsorbents A and CO2 in the calciner, the MeO in the calciner reacts with the substances transported in a fuel pre-conversion reactor to generate a reduced metal oxygen carrier; the regenerated adsorbents A and the reduced metal oxygen carrier in the calciner are transported to an air reactor to generate MeO and regenerated adsorbents A which are returned to the carbonation tower; fuel and reactants are introduced into the fuel pre-conversion reactor, part of the fuel is converted, and the products are sent into the calciner. Through fuel partial conversion and chemical looping combustion, the application realizes grade matching of the fuel conversion and the adsorbent regeneration process, avoids air separation energy consumption of separated pure oxygen, and effectively reduces CO2 capture energy consumption after medium-high temperature adsorption combustion.

A method for manufacturing electronic-grade sulfuric acid includes following steps: providing sulfur-containing material; burning the sulfur-containing material with pure oxygen to obtain sulfur dioxide gas; converting the sulfur dioxide gas into sulfur trioxide gas; and processing the sulfur trioxide gas to obtain the electronic-grade sulfuric acid.

The application belongs to the technical field of methanol preparation, and particularly relates to a device and a preparation method for preparing methanol by combining carbon dioxide hydrogenation with chemical chain combustion, which comprises a power generation system, an electrolytic cell, a chemical chain combustion reactor, a pure oxygen supplement combustion chamber and a methanol reaction unit. The power generation system is connected with the electrolytic cell. Oxygen generated by electrolysis of the electrolytic cell is connected with the chemical chain combustion reactor through a first pipeline. Oxygen generated by electrolysis of the electrolytic cell is connected with the pure oxygen supplement combustion chamber through a second pipeline. The chemical chain combustion reactor is connected with a raw material pipeline. The top of the chemical chain combustion reactor is connected with the pure oxygen supplement combustion chamber through a third pipeline. The pure oxygen supplement combustion chamber is connected with the methanol reaction unit through a fourth pipeline. Hydrogen generated by electrolysis of the electrolytic cell is connected with the methanol reaction unit through a fifth pipeline. Reaction products are discharged through a sixth pipeline.

The utility model discloses an ammonia gas stable combustion device which comprises a flame generator, an ammonia gas adding device and a pure oxygen adding device, the flame generator enables ignition fuel and oxygen to be mixed and combusted to generate flames, the ammonia gas adding device is used for adding ammonia gas to the outer side of the flames, the pure oxygen adding device is used for adding pure oxygen to the outer side of the ammonia gas, and the ammonia gas is stably combusted in a high-temperature area of the flames under the oxygen-enriched condition. According to the device, ignition fuel and oxygen are mixed and combusted to generate flames, the temperature of a high-temperature area of the flames reaches 2000 DEG C, ammonia gas and pure oxygen are heated and ignited, and the ammonia gas is high in combustion speed and not prone to flameout under the oxygen-enriched working condition, so that the ammonia gas can be stably combusted in the high-temperature area of the flames under the oxygen-enriched condition.

The application discloses a cast iron enamel low-temperature ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared from quartz, zero-water borax, soda ash, potassium carbonate, barium carbonate, potassium feldspar, magnesium carbonate, copper oxide, manganese oxide, aluminum oxide and recycled ternary battery positive electrode material according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1230±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, the fluorine content of the product is not detected, and the limit value requirement of the EU REACH regulation is met. Meanwhile, by introducing the recycled ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application discloses a steel plate enamel medium-temperature cobalt-nickel ground glaze free of fluorinated salt and nitrate, a preparation method and application thereof, and belongs to the technical field of enamel. The ground glaze is prepared according to specific mass proportions of quartz, zero-water borax, soda ash, potassium carbonate, calcium carbonate, potassium feldspar, copper oxide, iron oxide and recovered ternary battery positive material iron oxide. The preparation comprises raw material mixing, smelting at 1260±10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of a molten state. The ground glaze completely avoids the use of fluorinated salt and nitrate, eliminates fluorine emission and environmental protection equipment blockage problems from the source, the fluorine content of the product is not detected, and the product meets the limit value requirements of the EU REACH regulation. Meanwhile, by introducing the recovered ternary battery material, the adhesion of the ground glaze is obviously enhanced, the synergistic effect between components is strengthened, other performances are promoted, and resource recycling and cost reduction are realized.

The application provides a high-temperature pressure swing adsorption pure oxygen production equipment, which comprises a filter, an inlet of the filter is connected with an air pipeline, an outlet of the filter is connected with an inlet of a blower, an outlet of the blower is connected with an inlet of an air buffer tank, the blower is connected with a frequency converter, an outlet of the air buffer tank is connected with a first inlet of an adsorption tower, a second inlet of the adsorption tower is connected with an outlet of an oxygen back flushing tank, an outlet of the adsorption tower is connected with an inlet of a vacuum pump, an inlet of the oxygen back flushing tank is connected with an outlet of an oxygen buffer tank, the oxygen buffer tank is connected with an oxygen analyzer or a chromatograph and an oxygen flow meter, an outlet of the oxygen buffer tank is connected with an air outlet pipeline, and an outlet of the vacuum pump is connected with the air outlet pipeline. The application uses the principle of pressure swing adsorption, proposes a novel pressure swing adsorption process and equipment, breaks through the limitation of product oxygen purity, and obtains oxygen with a purity of ≥99.5%, thereby expanding a new application field of the pressure swing adsorption oxygen production process.