1) Metallurgy and Metal Processing Industry Used as protective gas for annealing and sintering, for nitriding, furnace purging and blowing. Widely used in metal heat treatment, powder metallurgy, magnetic materials, copper processing, metal wire mesh, galvanized wire, semiconductors, powder reduction, etc. Some of these industries require nitrogen with a purity greater than 99.5%, while others require high-quality nitrogen with a purity greater than 99.9995% and a dew point below -65℃.

1) Metallurgy and Metal Processing Industries

  is used for annealing protective gas, sintering protective gas, nitriding treatment, furnace cleaning and purging gas, etc. It is widely used in metal heat treatment, powder metallurgy, magnetic materials, copper processing, metal wire mesh, galvanized wire, semiconductors, powder reduction and other fields. Some of these industries require nitrogen with a purity greater than 99.5%, while others require high-quality nitrogen with a purity greater than 99.9995% and a dew point below -65℃. Metal production and processing manufacturing industries Steel, iron, copper, and aluminum product annealing, carbonization, high-temperature kiln protection, low-temperature assembly of metal parts and plasma cutting, etc. Metal heat treatment In bright annealing, bright quenching and other heat treatment processes, it provides protective gas and safety gas for industrial furnaces to prevent product oxidation. Bright quenching, bright annealing, nitriding, carbonitriding, soft carbonization and other heat treatment nitrogen sources, protective gas in welding and powder metallurgy sintering processes, etc. In metal heat treatment applications, nitrogen is used for alloy steel, high-carbon steel annealing protective atmosphere, metal powder sintering protective atmosphere, nitriding treatment, furnace cleaning and purging gas, etc. Durr Gas provides high-quality nitrogen with a purity greater than 99.9995% and a dew point below -65℃. Nitrogen-based atmosphere heat treatment, with nitrogen as the basic component, is a new technology and process for energy saving, safety, environmental protection, and full utilization of natural resources. It has been shown that almost all heat treatment processes, including quenching, annealing, carburizing, carbonitriding, soft nitriding, and recarburization, can be completed using nitrogen-based gas atmospheres. The quality of the metal parts processed is comparable to that of traditional endothermic atmosphere treatment. Aluminum processing industry Aluminum products, aluminum profiles processing, aluminum thin rolling and other gas protection. Powder metallurgy Powder sintering, nitrogen protection in magnetic material sintering. Synthetic fiber Nitrogen filling and pressure molding, wire drawing oxidation prevention. Lead-free tin soldering with nitrogen filling For reflow soldering and wave soldering. Metallurgical industry: Protective gas for continuous casting, continuous rolling, and steel annealing; top and bottom composite nitrogen blowing steelmaking in converters, sealing of converter steelmaking, sealing of blast furnace top, gas used for coal powder injection in blast furnaces, etc. Metal deep processing The application of nitrogen in steel is mainly used as a protective gas, such as rolling, galvanizing, chromium plating, continuous casting, etc., all require nitrogen as a protective gas, and the nitrogen purity is required to be above 99.99%. Durr Gas provides a gas solution with nitrogen purity up to 99.9995% for this purpose. The generation of medium and high voltage cables requires nitrogen Inert gas crosslinking Using polyethylene insulating materials with added peroxide crosslinking agent, the conductor shielding layer - insulation layer - insulation shielding layer is extruded through three-layer co-extrusion, and then the crosslinking process is completed continuously and uniformly through a sealed crosslinking tube filled with high-temperature and high-pressure nitrogen. The heat transfer medium is nitrogen (inert gas), the cross-linked polyethylene has excellent electrical properties, and the production range can reach 500KV.

2) Chemical and New Materials Industries

  is mainly used for chemical raw material gas, pipeline purging, atmosphere replacement, protective atmosphere, product transportation, etc. It is mainly used in chemical industry, spandex, rubber, plastics, tires, polyurethane, biotechnology, intermediates and other industries. Many chemical industries do not have high requirements for nitrogen purity, and many can be used with a purity greater than 98%. Acrylate oxidation explosion-proof, float glass process flow, protection Chemical industry Create an oxygen-free atmosphere in chemical processes to improve the safety of production processes, fluid transport power source, etc. Replacement, cleaning, sealing, leak detection, protective gas in dry coke quenching; catalyst regeneration, petroleum fractionation, chemical fiber production, etc. Petroleum industry Improve petroleum processing and refining processes, oil storage and oil and gas field well pressurization, pipeline cleaning and purging, solvent recovery, etc. Nitrogen purification of storage tanks, containers, catalytic cracking towers, pipelines, etc.; pneumatic testing of pipeline systems, etc. Offshore oil development; gas covering of platforms in offshore oil extraction, nitrogen injection for oil extraction, inerting of storage tanks and containers, etc. Glass manufacturing industry Prevent surface oxidation and heating furnace cooling during glass manufacturing. Float glass Gas protection during production, prevention of tin bath oxidation. Protective gas in float glass production Float glass industry In the float glass production process, the floating medium is very easy to oxidize at high temperatures in the tin bath, increasing tin loss and causing various defects on the glass surface. Therefore, protective gas nitrogen must be introduced into the tin bath, and 5%~10% hydrogen is added at the same time, forming a reducing atmosphere in the tin bath, so that tin oxide is reduced back to tin. By using ammonia decomposition nitrogen-hydrogen mixed gas provided by Durr Gas instead of water electrolysis hydrogen production, and the actual application in multiple float glass production lines, the low-energy consumption, simple operation, and relatively low explosion-proof grade protective gas production equipment is put into the float glass production line, which is beneficial for reducing hydrogen cost for the production of low, medium and high-grade float glass. Rubber Rubber vulcanization, tire crushing, etc. High-pressure molding oxidation prevention, wire and cable gas protection. Fertilizer industry: Nitrogen fertilizer raw materials; replacement, sealing, washing, protection of catalysts, etc. Plastics industry: Pneumatic transport of plastic particles; oxidation prevention during plastic production and storage, etc. Rubber industry: Packaging and storage of rubber; tire production, etc. Applications in chemical fiber production: In chemical fiber production, high-purity nitrogen is often used as a protective gas to prevent the oxidation of chemical fiber products during production, which may affect the color. The higher the purity of nitrogen, the more beautiful the color of the chemical fiber products.

3) Food and Pharmaceutical Industries

  is mainly used in food packaging, food preservation, pharmaceutical packaging, pharmaceutical displacement gas, and pharmaceutical conveying atmosphere. The nitrogen gas produced usually needs to undergo sterilization, dust removal, and water removal treatments to meet the special requirements of this industry. The food industry's requirements for nitrogen are not high; a purity of over 98% often suffices. The pharmaceutical industry usually requires nitrogen with a purity of 99.9%. When the amount of nitrogen used in the food industry is small, membrane separation nitrogen generation is often used; when the amount is large, pressure swing adsorption is more commonly selected. Research and medical applications include cryogenic and cryotherapy. Pharmaceutical and health applications include pharmaceutical raw materials, nitrogen filling of drug packaging and transportation, and the pest and decay prevention of Chinese herbal medicine. Beer and beverage applications include process gas, preservation, and storage. Pharmaceutical industry: nitrogen filling storage and preservation of Chinese medicine (such as ginseng); nitrogen filling of Western medicine injections; nitrogen filling of storage and containers; gas source for pneumatic conveying of medicine, etc. Pharmaceutical nitrogen equipment (nitrogen purity 99.99%) is a pharmaceutical nitrogen generator developed based on years of professional R&D experience in pressure swing adsorption nitrogen generators and in accordance with GMP standards. Compared with cylinder nitrogen (or liquid nitrogen), it has lower operating costs, stable nitrogen purity, and simple operation. Food industry: used for food preservation and storage, food drying and sterilization, and rapid food freezing. Nitrogen filling storage and preservation of fruits, vegetables, and tea leaves is also a state-of-the-art method. This method allows fruits, vegetables, and leaves to slow their metabolism in a high-nitrogen, low-oxygen environment, as if entering a state of hibernation, inhibiting after-ripening, and thus enabling long-term preservation. According to experiments, apples stored in nitrogen remain crisp and refreshing even after 8 months. Food preservation: nitrogen filling storage and preservation of grains, fruits, and vegetables; nitrogen filling preservation packaging of meat, cheese, pickles, tea, and coffee; nitrogen filling deoxygenation preservation of fruit juice, raw oil, and jam; purification and covering of various bottled wines, etc. Using nitrogen to keep grains in a dormant and hypoxic state and slowing down metabolism can achieve good pest, mildew, and deterioration prevention effects. The grains remain uncontaminated. Using nitrogen to displace air in the storage of rice, wheat, barley, corn, and other grains can prevent insect damage, heat generation, and mildew, ensuring quality preservation during summer. This method involves tightly sealing the grain with plastic sheeting, first creating a low-vacuum state, and then filling it with nitrogen of about 98% purity until the internal and external pressures are balanced. This creates a hypoxic environment in the grain pile, reducing the respiratory intensity of the grain and inhibiting the reproduction of microorganisms. Insects die within 36 hours due to lack of oxygen. This deoxygenation pest control method not only saves significant costs (approximately one percent of the cost of using highly toxic drugs such as zinc phosphide for fumigation), but also maintains the freshness and nutritional value of the grain, preventing bacterial infection and drug contamination. The preservation cost of apples is about 10 cents per kilogram. Nitrogen filling storage can significantly reduce fruit losses during peak season and ensure supply in the off-season, improving the quality of export fruits and increasing foreign exchange earnings. Tea degassing and nitrogen filling packaging involves placing tea in a double-layer aluminum foil (or nylon polyethylene-aluminum composite foil) bag, removing air, injecting nitrogen, and sealing it. One year later, the tea remains fresh, with clear and bright tea soup and a pure and fragrant taste. This preservation method is clearly superior to vacuum packaging and freezing packaging. Currently, many foods still use vacuum packaging and freezing packaging; vacuum packaging is prone to leakage, and freezing packaging is prone to deterioration, neither of which is as good as vacuum nitrogen filling packaging.

4) Electronics industry

  is used in the packaging, sintering, annealing, reduction, and storage of electronic products. It is mainly used in wave soldering, reflow soldering, crystals, piezoelectrics, electronic ceramics, electronic copper strips, batteries, and electronic alloy materials industries. The electronics industry generally has high requirements for nitrogen, usually requiring 99.9% or 99.99%, and even higher purity nitrogen. Electronics industry: atmosphere protection, cleaning, and chemical recovery in semiconductor and integrated circuit manufacturing processes. Nitrogen source for large-scale integrated circuits, color TV picture tubes, television and recorder components, and semiconductor component processing. In the production of electronic components and semiconductor components, nitrogen with a purity of 99.999% or higher is required as a protective gas. Currently, China has already applied high-purity nitrogen as a carrier gas and protective gas in the production of color TV picture tubes, large-scale integrated circuits, liquid crystals, and semiconductor silicon wafers. SMT industry: Currently, the global manufacturing industry must meet lead-free standards, and more and more manufacturers have used new reflow soldering ovens with nitrogen options to respond to the lead-free initiative. This is because the nitrogen-based atmosphere prevents the oxidation of metal surfaces during heating. The gas solutions provided by Dürr guarantee proper flux activation, reduce residual flux, enhance welding quality, and improve the appearance of the welding surface.

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