Real-time repairable blast furnace stave

The present invention relates to a stave and to the structure inside a blast furnace that produces molten iron while charging coke and iron ore.  

If the cooling pipe of the stave is damaged due to the inevitable shock inside the blast furnace, and the stave cooling pipe is damaged, it must be repaired immediately. However, due to the high pressure and high temperature environment inside the blast furnace, it is difficult to repair the stave without stopping the blast furnace, so manufacturing costs increase as the operation of the blast furnace is stopped to repair the stave. This technology seeks to propose a stave that can automatically repair damaged cooling pipes without stopping the operation of the blast furnace.

This technology repairs damaged parts of cooling pipes in real time, allowing staves to be repaired without stopping the operation of the blast furnace, thereby minimizing economic losses and contributing to the safety and lifespan of the blast furnace, thereby improving productivity in the steel industry.

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Key Features:

• The stave consists of a cooling housing and a cooling pipe through which coolant containing an epoxy material flows
• It includes a maintenance pipe through which a repair liquid containing an epoxy hardener flows, and the outlet is located adjacent to the cooling pipe
• Further includes a fixing plate for fixing the cooling pipe, and the cooling housing has a first through-hole at a position corresponding to the fixing plate
• It has a second through-hole at a position not overlapping with the fixing plate, The water pipe penetrates the second through hole

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본 기술은 한국교통연구원의 화물차 운행 중 연료저감을 위한 공기저항 및 공기와류 저감장치 연구과제 지원을 통해 개발되었습니다.

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Lithium-sulfur battery cathode material with improved electrochemical stability

This technology is about a material for a lithium-sulfur battery anode, and is about a lithium-sulfur battery using carbon nanofibers doped with iron and nitrogen.

During the charging and discharging process, polysulfide with lithium as an end dissolves in the electrolyte and moves between the anode and the cathode, resulting in loss of anode active material and deterioration of cycling performance due to the shuttle effect. This technology solves these problems through carbon nanofibers doped with iron and nitrogen. I suggest.

The manufacturing method of iron and nitrogen-doped carbon nanofibers according to this technology has excellent physicochemical adsorption performance for lithium polysulfide through improved porosity and increased polarity within the structure, making it possible to implement lithium sulfur batteries with improved electrochemical stability, making it a necessary technology for new secondary batteries.

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Key Features:

• Manufacturing a metal organic framework (MOF) containing iron, and nanofibers containing nitrogen
• Carbon nanofibers doped with iron and nitrogen are obtained by heat-treating the nanofibers, and the metal-organic framework is characterized by growing on the surface of the nanofibers
• Preparing precursor nanofibers by electrospinning an electrospinning solution containing a nitrogen-containing polymer, an iron precursor, and a solvent
• Organic ligand solution Forming a metal-organic framework by immersing the precursor nanofibers in an iron precursor solution

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This technology was developed through support from the National Research Foundation of Korea's functional interface structure research project for lithium cathode-based high-capacity energy storage.

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Long-term cycle stability iron-doped lithium manganese oxide (LMO)

The present invention relates to a cathode active material for lithium ion secondary batteries, and to an iron-doped lithium excess oxide cathode active material and a manufacturing method.

Among secondary batteries, lithium-ion batteries (LIB) using an anode material with a layered structure have the highest energy density, so NCM batteries, which are ternary batteries of nickel (Ni), cobalt (Co), and manganese (Mn), are widely used. However, due to limited availability and high prices, research on Li2MnO3 (LMO), an overlithiated layered oxide (OLO) material, is being conducted. Although progress was being made, it had the disadvantage of low lifespan stability. To solve these problems, this technology proposes a method of doping iron to reduce costs and improve structural stability and rate characteristics.

The cathode active material of this technology does not use any expensive cobalt or nickel in Li2MnO3, but dopes it with cheap and eco-friendly iron. It is a groundbreaking technology to be used in the Iithum battery industry as it has cost reduction effects and excellent performance with capacity and long-term cycle stability as much as existing LiNiMnCoO2 (NCM) batteries.

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Key Features:

• Provision of a cathode active material represented by the chemical formula Li2Mn1-xFexO3, in which iron is doped into lithium manganese oxide (LMO)
• Mixing a lithium supply compound, a manganese supply compound, and an iron supply compound in a solvent, followed by the addition of a chelating agent and a basic solution
• Drying the reaction solution to obtain a gel, then heat-treating it to secure a precursor
• Heat-treating at 850 to 950 °C for 3 to 7 hours in an O2 atmosphere

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This technology was developed through support from the National Research Foundation of Korea's research project on functional interface structures for high-capacity energy storage based on lithium cathodes.

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Boat tail that minimizes air resistance and vibration

This technology is about a truck equipped with a boat tail to reduce air resistance and improve driving stability.

Fuel costs, which account for the largest cost among logistics costs, increase or decrease depending on various conditions, and air resistance has a significant impact on the fuel efficiency of trucks. This technology effectively controls the flow at the rear of the car body, reducing air resistance and flow noise, and aims to provide a boat tail for trucks and a truck equipped with a boat tail that can improve driving stability.

The boat tail using this technology reduces the size and strength of the recirculation area formed at the rear of the car body by controlling the flow separation that occurs at the rear of the vehicle, thereby dramatically increasing driving stability and reducing vibration by reducing the influence of lateral force applied to the truck. The possibility of damage to goods due to vibration during transportation can be minimized.

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Key Features:

• The boat tail consists of a straight first end fixed to the rear of the cargo compartment and a second end spaced apart from it and made of a continuous wave.
• Has a curve that gradually increases from the first end toward the second end.
• The continuous waveform of the second end has one of a sinusoidal wave, a triangular continuous wave, and a trapezoidal continuous wave. placed slanted toward the tail

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This technology was developed through support from the Korea Transport Institute's research project on air resistance and air vortex reduction devices to reduce fuel during truck operation.

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High temperature stable mesoporous cobalt-iron hybrid catalyst

This technology relates to a cobalt-iron hybrid catalyst for Fischer-Tropsch synthesis reaction, a method for producing the same, and a method for producing hydrocarbons using the same. A cobalt-iron hybrid catalyst for the Fischer-Tropsch synthesis reaction having a regular mesoporous main skeleton in which cobalt oxide and iron oxide are uniformly mixed, a method for producing the same using a hard casting technique, and a method for producing hydrocarbons using the same. This is about the method of producing hydrocarbons.

The existing Fischer-Tropsch catalyst had difficulties in efficient hydrocarbon synthesis due to problems such as low activity and structural instability. This technology overcomes these limitations by developing a cobalt-iron hybrid catalyst with a regular mesoporous main skeleton.

This catalyst has a three-dimensional structure in which cobalt oxide and iron oxide are uniformly mixed, and is manufactured using a hard casting technique, maintaining high activity and excellent structural stability even at high temperatures and harsh reaction conditions, enabling a stable Fischer-Tropsch reaction without a separate cocatalyst. This allows selective, high-yield production of C2-C4 light hydrocarbons and C5+ heavy distillate hydrocarbons from syngas.

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Key Features:

• Manufacturing a hybrid catalyst with a three-dimensional porous structure in which cobalt oxide and iron oxide are uniformly mixed through a hard templating method using mesoporous silica as a 'frame'
• The skeleton of the catalyst itself is made of active materials (Co, Fe), so it has more reaction active sites than existing support catalysts
• Cobalt-iron mixed oxide (CoFe2O4, etc.) is a structure enhancer It maintains the porous structure stably without collapsing even under high-temperature hydrogenation reaction conditions.

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This technology was developed through support from the National Research Foundation of Korea's climate change response technology development research project.

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Catalyst that converts the greenhouse gas methane into alcohol at room temperature and pressure

This technology relates to a method for producing a porous iron oxide-zirconia composite catalyst, a porous iron oxide-zirconia composite catalyst produced thereby, and a method for producing alcohol using the same under room temperature and pressure conditions.

Existing methane conversion technology had the limitation of high alcohol production costs due to the complex process of high temperature and high pressure. To solve these problems, this technology proposes a porous iron oxide-zirconia composite catalyst and its manufacturing method that directly convert methane into alcohol under room temperature and pressure conditions.

This composite catalyst can efficiently produce methanol, ethanol, propanol, etc. from methane through electrochemical reaction at low cost and enables energy-efficient, eco-friendly alcohol production.

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Key Features:

• Using the synergy effect of iron oxide and zirconia
• Iron oxide plays a role in activating the C-H bond of methane, and zirconia supplies the oxygen necessary for oxidation by adsorbing carbonate (CO₃²⁻) ions in the solution
• Electrochemical methane oxidation reaction occurs at room temperature through the combined action of the two elements
• Carbonate ion adsorption using tetragonal phase zirconia Increases catalyst efficiency by maximizing characteristics.

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This technology was developed through support from the National Research Foundation of Korea's research project on photo/electrochemical reaction catalyst technology for methane conversion.

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Improved AI voice recognition performance Noise/reverberation robust sound source localization

This technology relates to a sound source localization method, and applies a dispersion mask created using CDR (Coherence to Diffuseness ratio), which is a coherence to dispersion power ratio, to a mixed signal input through multiple microphones in a noise and reverberation environment, and estimates the direction of the target sound source based on a cross-correlation technique. It relates to a sound source localization method and sound source localization device that are robust to reverberation and dispersion noise.

Previously, performance degradation of AI voice recognition speakers was a problem at long distances and in noisy and reverberant environments. To overcome these limitations, this technology proposes an innovative sound source localization method and device using a dispersion mask.

The input signal is pre-processed through a CDR-based binarization mask, and the GCC-PHAT or SRP-PHAT algorithm is applied to ensure robustness to noise and reflection and enable accurate sound source direction estimation. This dramatically improves voice recognition rates and provides stable AI services.

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Key Features:

• Using the difference in 'Coherence' and 'Diffuseness' characteristics between the voice signal and the noise signal
• Calculate CDR (Coherence to Diffuseness Ratio), which is a 'Coherence to Diffuseness Ratio' containing information about the target sound source and noise, to distinguish areas where the voice signal is dominant and areas where the noise is dominant
• Binarized dispersion diagram that effectively suppresses noise and reverberation components By creating a mask (Binary Diffuseness Mask) and applying it to the input signal to pre-process the signal, the accuracy of sound source direction estimation is improved.

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This technology was developed through support from the National Research Foundation of Korea's research project on robust continuous speech recognition based on multimodal deep learning for audio-visual information.

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Hybrid hollow fiber membrane with improved gas separation efficiency

This technology relates to a polymer hollow fiber membrane and manufacturing method with excellent gas separation performance, a hybrid polymer hollow fiber membrane containing a fluorine-containing glassy polymer matrix and ladder-type polysilsesquioxane, and a hybrid carbon molecular sieve hollow fiber membrane manufactured by thermal decomposition.

This technology solves the problems of low energy efficiency, plasticization, and aging phenomenon of existing gas separation membranes. We provide a hybrid polymer hollow fiber membrane containing a fluorine-containing glassy polymer matrix and ladder-type polysilsesquioxane, and a carbon molecular sieve hollow fiber membrane manufactured by thermal decomposition.

This technology delays the relaxation of the polymer chain through the anti-aging and anti-plasticization effects of ladder-type polysilsesquioxane, and minimizes the collapse of the porous support to achieve excellent gas permeability and selectivity. In particular, it increases the CO2 permeability of the carbon molecular sieve hollow fiber membrane by 546% and suppresses physical aging, providing a high energy efficiency and large-capacity gas separation solution.

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Key Features:

• Uses a hybrid material combining a fluorine-containing glassy polymer matrix and ladder-type polysilsesquioxane (LPSQ)
• LPSQ's rigid double-stranded siloxane structure inhibits the movement of the polymer chain, providing anti-plasticization and aging resistance effects
• During the thermal decomposition process, LPSQ increases the glass transition temperature of the polymer, minimizing structural collapse of the porous support
• The organic functional groups contained in LPSQ maximize the performance of the material by enabling uniform mixing with the polymer matrix

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This technology was developed through support from the National Research Foundation of Korea's research project to realize the next-generation membrane molecular sieve function for high-efficiency N2/CH4 separation.

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Protease sensor for disease diagnosis and drug screening

This technology is about a sensor for proteolytic enzyme detection using a metal nanoparticle-nucleic acid-peptide complex.

To solve the problems of high cost, long time, and low stability of protein detection methods, an innovative sensor using a metal nanoparticle-nucleic acid-peptide complex was developed. This technology specifically emits strong fluorescence when a peptide is degraded by a specific proteolytic enzyme, quickly and accurately measuring the proteolytic enzyme.

This technology can be used in a variety of fields, including cell-based non-destructive and real-time measurement, body fluid-based on-site disease diagnostic kits, drug screening, and cell and tissue imaging. In particular, it is a platform that can contribute to the early diagnosis and development of treatments for major diseases such as cancer, arthritis, and neurological diseases.

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Key Features:

• It operates like a switch on and off the fluorescent signal by controlling the distance between the gold nanoparticle and the fluorescent substance using the Metal-Enhanced Fluorescence (MEF) phenomenon.
• Off state (Fluorescence quenching): Normally, the fluorescent substance is connected to the surface of the gold nanoparticle by peptide and DNA and maintains a very close distance.
• On state (Fluorescence amplification): When a specific proteolytic enzyme appears and cleaves the peptide, the distance between the fluorescent substance and the gold nanoparticle increases. As it moves further away, the optimal distance of about 8 nm is secured, the quenching effect disappears and the fluorescence signal is amplified dozens of times.
• Label-free method that does not require a separate label, allowing users to measure proteins more easily and quickly

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This technology was developed through support from the Research Fellow research project of the National Research Foundation of Korea.

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Methane conversion reaction bed regeneration using low-temperature plasma

This technology relates to a method of regenerating a deactivated methane dimerization reaction bed in a dielectric barrier discharge plasma reactor.

In the existing technology, carbon deposition (coke) on the reaction bed occurring in the methane dimerization process reduced catalyst activity and made regeneration difficult. This technology utilizes dielectric barrier discharge (DBD) plasma to effectively remove coke in the deactivated methane dimerization reaction bed by low-temperature plasma treatment in an oxidizing atmosphere.

This technology's 'in-situ regeneration' method preserves the catalyst structure compared to existing high-temperature heat treatment, increases energy efficiency, and can continuously produce C2+ hydrocarbons (ethylene, ethane) and hydrogen from methane with high efficiency.

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Key Features:

• C-H bonding of methane under room temperature and pressure conditions using dielectric barrier discharge (DBD) plasma, a type of low-temperature plasma.
• Conversion of methane into high value-added hydrocarbons such as C2 or higher, such as ethane, ethylene, and acetylene, and hydrogen, without additional heat energy or oxidizing agent.
• Removal of coke by injecting an oxygen-containing mixture (e.g., air) within the same DBD plasma reactor.
• Methane Continuous operation is possible by repeating the conversion (step 1) and bed regeneration (step 2) processes more than once as needed

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This technology was developed through the support of the National Research Foundation of Korea's research project on 3D graphene with a highly regular pore structure for CO hydrogenation reaction.

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