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ZHONGYI GAS TECHNOLOGY

12

2019-04

Some industrial applications of nitrogen

In the process of industrial production, toxic and harmful, volatile, flammable and explosive materials need to be protected by inert gases. Nitrogen, as one of the inert gases, has a rich gas source, with a content of 79% in the air, and has been increasingly widely used in production. At present, the single making device is widely used in safety protection gas, replacement gas, nitrogen injection three times oil recovery, coal mine fire prevention and fire fighting, nitrogen based atmosphere heat treatment, anti-corrosion and explosion-proof, electronic industry, integrated circuit, etc. Carbon molecular sieves and zeolite molecular sieves are used more in the field of nitrogen production. The separation of oxygen and nitrogen by molecular sieve is mainly based on the different diffusion rates of the two gases on the surface of molecular sieve. Carbon molecular sieve is a carbon-based adsorbent with some characteristics of activated carbon and molecular sieve. Carbon molecular sieves are composed of very small pores. The smaller diameter gas diffuses faster and enters the solid phase of the molecular sieve, so that the nitrogen enrichment component can be obtained in the gas phase. Molecular sieve nitrogen is air as raw material, with carbon molecular sieve as adsorbent, using the principle of pressure change adsorption, the use of carbon molecular sieve on oxygen and nitrogen selective adsorption and separation of nitrogen and oxygen method, commonly known as PSA nitrogen device. As adsorbent for different gases in the adsorption capacity and adsorption speed, adsorption and other differences, as well as the adsorbent adsorption capacity varies with pressure change, therefore the PSA nitrogen making device can be finished in a pressurized conditions of mixed gas adsorption separation process, reduce pressure desorption adsorption by the impurity components, so as to realize the recycling of gas separation and adsorbent. In some emerging material industry, electronic industry, integrated circuit, beer beverage and other inert gas applications are also constantly expanding new application fields. For example, the new PSA nitrogen production device has been used for inert protection of mobile phone lithium battery production, nitrogen packaging for beer and beverage, nitrogen dehydration and drying in organosilicone production, and nitrogen packaging for snack food instead of air and deoxidizer. The application of nitrogen makes the products of these enterprises in the process technology, product quality has been improved, to win the core competitiveness.

2019-04-12

12

2019-04

Uses and common preparation methods of nitrogen

First, the nature of nitrogen Nitrogen, under normal conditions, is a colorless, tasteless, odorless gas and is usually non-toxic. Nitrogen accounts for 78.12% of the total atmosphere (volume fraction). At normal temperature, it is a gas. At standard atmospheric pressure, it becomes a colorless liquid when it is cooled to -195.8℃. When it is cooled to -209.86℃, liquid nitrogen becomes a snow-like solid. Usage: chemical synthesis (synthetic nylon, acrylic fiber, synthetic resin, synthetic rubber and other important raw materials), automobile tires (nitrogen can effectively reduce the noise of tires, prolong the service life of tires). Because nitrogen is chemically inert, it is often used as a protective gas, such as melon, fruit, food, and light bulb filling gas. Two, the use of nitrogen Nitrogen in metallurgy, chemical industry, light industry, electronics and other departments, as feedstock gas, protective gas, replacement gas and sealing gas. Liquid nitrogen products are also widely used in food frozen, vegetables and fruits preservation. It is also widely used in agriculture and animal husbandry, such as insecticidal grain storage, frozen storage of semen of superior livestock, etc. Is the constituent of proteins in plants and animals. With the progress of science and technology and the development of economy, the application scope of nitrogen is expanding day by day. Take advantage of the inertia of nitrogen Metal thermal processing: bright quenching, bright annealing, carburizing, carbonitriding, soft nitriding and other nitrogen based atmosphere heat treatment of nitrogen source, welding and powder metallurgy burning process protection gas, etc. Metallurgical industry: continuous casting, continuous rolling, steel annealing protective atmosphere, BOF top compound blowing nitrogen steelmaking, steelmaking BOF seal, BF top seal, BF ironmaking pulverized coal injection and other processes. Using cryogenic liquid nitrogen Electronic industry: large-scale integrated circuit, color TV picture tube, TV and recorder components and conductor production process protection, etc. Food preservation: food, fruit (fruit), vegetables and other air conditioning storage and preservation, meat, cheese, mustard, tea and coffee, such as fresh packaging, jam, such as nitrogen oxygenation preservation, various bottles of wine purification and covering, etc. Pharmaceutical industry: Chinese medicine (ginseng) nitrogen filling storage and preservation, western medicine injection nitrogen filling, storage tank and container nitrogen filling oxygen, drug pneumatic transmission of air source, etc. Chemical industry: replacement, cleaning, sealing, leak detection and protection of gas, dry quenching, catalyst regeneration, petroleum fractionation, chemical fiber production, etc. Fertilizer industry: raw material of nitrogen fertilizer. Catalyst protection copy, washing gas, etc. Plastics industry: pneumatic transmission of plastic particles, plastic production and storage oxidation prevention. Rubber industry: rubber packaging and storage, tire production, etc. Glass industry: Protective gas for float glass production process. Petroleum industry: nitrogen filling and purification of storage, containers, catalytic towers and pipelines, pressure leak detection of management systems, etc. Offshore oil development: gas covering of offshore oil platforms, nitrogen injection for oil recovery, tank and container inerting, etc. Lump storage: to prevent cellar, barn and other warehouse combustible dust ignition and explosion, etc. Shipping: oil tanker cleaning gas, etc. Aerospace technology: rocket fuel booster, launch pad replacement gas and safety protection gas, astronaut control gas, space simulation room, aircraft fuel pipeline cleaning gas, etc. Other: paint and coating nitrogen oxygenation to prevent the polymerization of oil drying, oil and natural gas storage tanks and containers nitrogen oxygenation, etc. Using cryogenic liquid nitrogen Hypothermia medicine: surgical hypothermia, cryotherapy, blood refrigeration, drug freezing and cryopatter, etc. Biomedicine: cryopreservation and transportation of precious plants, plant cells, genetic germplasm, etc.

2019-04-12

12

2019-04

Compressed air filter replacement steps and matters needing attention

Compressed air filter use time is too long, will lead to too much internal impurities, affect the gas flow rate, pressure, filtration effect; Therefore, the replacement of compressed air filters needs to be carried out regularly. The general replacement cycle is 1 year. If the user uses the environment well, it can be appropriate for a long time. If the environment is bad, it may need to be replaced in about 8 months. Compressed air filter element replacement steps: 1. Confirm that the air pressure system has stopped running; 2. Prepare suitable filter elements (specifications, material, size, O-ring material, model, etc.), disassembly tools, collection barrels, rags, etc.; 3. Disconnect the filter element that needs to be replaced from the system. Slowly open the exhaust port at the top of the filter to relieve pressure, pay attention to safety during the process to prevent splashing of materials or liquids; 4. Empty the material in the filter, open the upper cover of the filter with a tool, take out the filter element, and install the filter element with a plastic bag to be scrapped; 5. Clean the inside of the filter with a rag; 7, check the O-ring for damage, aging and other problems; 8. The material inflow is installed according to the method of inflow from the outside of the filter element and outflow from inside the filter element. 9. Hold the filter element near one end of the O-ring, insert the filter element socket into the filter element socket vertically, insert the filter element, then install the upper cover of the filter, and tighten the filter with a tool; In the process of replacing the filter element, sealing and cleaning are the most critical work, so in the process of O ring, screw, cover, etc., we should be especially careful.

2019-04-12

12

2019-04

Function of refrigerated dryer in air compressor

Xiaobian will briefly share with you the role of freeze dryer in air compressor. Take a look! Advantages: 1, no compressed air consumption, most users of compressed air dew point requirements are not very high, the use of freeze dryer than the use of adsorption dryer to save energy; 2, do not need to regularly add, replace the adsorbent; 3. Low running noise; The adsorption dryer has the noise of pressure relief of the adsorption tower. In the air pressure room, the operation noise of the freeze dryer is generally not heard. 4, no valve parts wear; 5, the daily maintenance is simple, as long as the automatic drain filter can be cleaned on time; 6. There is no special requirement for the pre-pretreatment of air source and supporting air compressor. The general oil-water separator can meet the requirements of the intake air quality of the refrigerated dryer. 7. The refrigerated dryer has a "self-cleaning" effect on the exhaust gas, that is, the content of solid impurities in the discharged gas is less; 8. While discharging the condensate, part of the oil vapor can also be condensed into liquid oil mist and discharged with the condensate.

2019-04-12

12

2019-04

Must the dryer be installed behind the air compressor?

Must the dryer be installed in the air compressor post-treatment equipment? The answer is yes, if your enterprise is useful to the air compressor, you must know that the air compressor must be installed after the dryer. After the air compressor, the air storage tank, filter and dryer and other purification equipment need to be installed. It is well known that when the air around us is compressed, the amount of water molecules per unit volume rises dramatically. The compression process results in air containing not only liquid water, oil, and particulate matter, but also large amounts of saturated water molecules. Once the external temperature drops, the saturated water molecules are affected by the low temperature and precipitate liquid water. The lower the temperature, the more liquid water precipitates. When the temperature drops to zero, the liquid water condenses into ice, resulting in ice blockage. And the compressed air containing too much water molecules will also affect the normal operation of the equipment, corrosion of machinery and equipment, causing damage to pneumatic components and so on. Some people may ask, to remove the water molecules in compressed air, you can directly use a filter to remove it, why buy a large price dryer? Why is that? This is because the filter can only remove liquid water in the compressed air, but the water molecules in the compressed air will continue to precipitate liquid water with the lower the temperature. In addition to liquid water, the water molecules in the compressed air will also affect the life of machinery and equipment and the production process of enterprises. Purchase dryer, can dry the water molecules in the compressed air, so that the compressed air can meet the gas standards of the enterprise, so as to meet the production needs of the enterprise. Investment in air compressor post-treatment equipment dryer return is very high, it effectively reduces the water molecules in the air, avoids the damage of machinery and equipment and gas equipment, can improve the production process of enterprises, reduce the product defect rate, and ensure the quality of products.

2019-04-12

12

2019-04

What function does the freeze dryer have for production?

Compressed air is widely used and has become the second largest industrial power source. The compressed air freezer dryer is used for drying compressed air equipment. In the compressed air, there are mainly water, dust and oil that need to be removed. The refrigerated dryer undertakes the work of water removal. What's the harm of water? The atmosphere contains a large number of water molecules, after being compressed to produce a large number of liquid water, will make the pipeline and equipment rust. In spraying, PCB and other industries, it will also pollute raw materials, which has a great impact on the production quality. Therefore, the freeze dryer emerged at the historic moment. It is used to dry compressed air through freezing cooling technology. After the compressed air processed by the freeze dryer, 95% of the water molecules are removed. At present, the air compressor station in China is basically equipped with a refrigerated dryer, which is economical and practical, convenient to operate, and not much energy consumption (electricity). If the freeze dryer is not used, there will be a large amount of water in the compressed air into the back end of the gas, resulting in equipment failure and damage, pipeline corrosion, product defect rate reduction will greatly increase the production cost, bringing a huge burden to the enterprise. We have seen a textile factory in Dongguan. Due to the lack of understanding of compressed air and the low initial budget, a filter was installed at the back end, so that a large amount of liquid water entered the air jet loom and pipeline. Although the water did little harm to the cloth, the failure rate of the equipment was very high, and the monthly loss cost was tens of thousands of yuan. And a freeze dryer only needs several thousand yuan, so the biggest role of the freeze dryer for enterprises is to reduce production costs.

2019-04-12

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