Related problems of nitrogen

Nitrogen is the main component of air, which is colorless, odorless, nontoxic and nonflammable at normal temperature and pressure. Its boiling point is-195.8℃, and its chemical properties are inactive. In addition to synthetic ammonia, nitrogen is usually used as a protective gas in metallurgy, chemical industry, coal, food, medicine, electronics, magnetic materials, transportation, heat treatment, tires, thermoelectric, aviation and other industries. Special pressure swing adsorption nitrogen production equipment for petrochemical industry The chemical industry is the industry with the largest application of nitrogen production equipment. At present, PVC is widely used, with a purity of 99.5% and a large flow rate. Polypropylene (PE) has a purity of 99.9% and a large flow rate. The nitrogen application of this product is divided into two parts. 1. Activators and catalysts need 99.9% nitrogen (a small amount) when they are filled and emptied, and the nitrogen used in the reactor is 99.5%, and the purity is 99.9% customarily. The purity of polyethylene and aniline is 99.95%. The nitrogen used for regeneration of aniline catalyst for petrochemical products is about 4 times as much as usual, but its service life is short. Maleic anhydride and ethanol have a general purity of 99.9%, and the petrochemical product polyoxymethylene (there are not many domestic manufacturers at present, and the demand is strong) has a purity of 99.9%. Petroleum: It can be used for nitrogen purging of pipelines and containers in the system, nitrogen filling of storage tanks, displacement, leakage detection and protection of combustible gases, and also for diesel hydrogenation and catalytic reforming, with a purity of 99.9%. Phthalic anhydride: the purity is 99%. Polyester: PTA (purified terephthalic acid), the upstream raw material, has an actual purity of 95%, generally 99%. During PTA production, high-purity nitrogen is used to blow bubbles, and the liquid level of ethylene glycol raw materials in high-temperature and low-temperature reactors is measured. After measuring the pressure difference between the high pressure end and the low pressure end, transmit a standard signal of 4 ~ 20 mA, and then convert it into the liquid level height. High purity nitrogen is used to measure the pressure of vacuum system, and high purity nitrogen is used to backwash the filter in PTA production. According to the actual process, the average polyester chip is 99%~99.999%, and the downstream product filaments and short silk of the chip are 99.9~99.999%. Float glass: purity 99.9995%, no hydrogen. Heat treatment: galvanized sheet is divided into annealing and galvanizing processes, and the purity of nitrogen is required to be 99.9995% and H 2 5~20%. The equipment composition is quite complicated. Aluminum material: generally 99.9995%, it is required to contain no hydrogen, otherwise there will be a "hydrogen battery" phenomenon. Automobile air conditioning: basically use liquid nitrogen, according to the actual situation, 99.999%, carbon combustion method can fully meet the requirements. Tire Nitrogen Charging and Pressure Swing Adsorption Nitrogen Making Equipment 265438+The key to tire competition in the 20th century lies in technology and price, and the price of tire is closely related to manufacturing technology. Ricky PSA nitrogen production equipment can help you win the first opportunity in the competition, and realize effective value promotion in Shanghai Shuangqian Truck Tire Company. In the traditional domestic technology, steel radial tires are vulcanized by superheated water. The so-called superheated water vulcanization is to use low-pressure steam to shape the tire. In the process of tire vulcanization, high-pressure hot water above 170℃ is used as the filling medium of the capsule (similar to the role of the mold), and low-pressure steam is used for vulcanization at the external temperature. Nitrogen vulcanization refers to the use of low-pressure nitrogen (0.4-0.5MPa) for tire shaping. During normal tire vulcanization, the medium filled in the capsule is a mixture of high-pressure steam and high-pressure nitrogen (2.5MPa), and the external temperature is low-pressure steam for vulcanization. Both methods use high temperature to change the chain-like molecular structure of natural rubber into a network structure, and at the same time, the belt layers are closely combined to form patterns on the tread. In the test of nitrogen vulcanization, the performance indexes of tire such as mileage, durability, uniformity and puncture ability are higher than those of traditional superheated water vulcanization. The purchase cost of nitrogen production equipment can basically recover all the investment in more than one year. At present, some car radial tires in China have been widely vulcanized with nitrogen, such as Tong Jia tires and Linglong tires. As for radial truck tires, Shanghai Shuangqian Tire Company was the first to use them, and all the above manufacturers used nitrogen equipment produced by Ricky Company. The nitrogen consumption of each car tire is about 1.25m 3, and that of each truck tire is about 12m 3. General factories use nitrogen recovery to save nitrogen cost, and usually consider 40-50% nitrogen recovery. The essence of nitrogen injection in coal mine is to inject a certain flow of nitrogen into the oxidation zone or fire zone of goaf to reduce its oxygen content to below 7% or 3%, so as to achieve the purpose of fire prevention and its function is to eliminate the danger of gas explosion; Prevent natural heating and spontaneous combustion of coal; Reduce the combustion intensity and prevent air leakage. Its working principle is shown in the figure: according to the different mine conditions, coal output, ventilation, transportation distance, gas content and spontaneous combustion period, Ricky provides customers with KGZD series ground fixed and JXZD series underground mobile nitrogen production equipment. This series of equipment is jointly manufactured by Wenzhou Ruiqi Air Separation Equipment Co., Ltd. and Chongqing Branch of Coal Research Institute, and has obtained the national certificate of coal mine product safety mark. Water injection (penicillin, etc. ) and large infusion (such as amino acids, etc. ) It is usually easy to be oxidized in pharmaceutical PSA nitrogen generator, so it needs nitrogen flushing protection, otherwise the liquid medicine is easy to be oxidized during storage, that is, deteriorated. Generally, before packaging, nitrogen flushing (or only nitrogen flushing) is carried out to reduce the oxygen concentration in ampoules or infusion bottles to below 0.5%, and the liquid medicine can be guaranteed for a long time. At present, the equipment purchased by general manufacturers is about 5-20 m 3 /h, and the purity is 99.99%. The difference between the medical nitrogen generator and other nitrogen generating equipment is that the part in contact with drugs or liquid medicine is made of stainless steel and needs to be sterilized, and the nitrogen outlet of the equipment is equipped with a sterilization filter device. Also, because pharmaceutical companies have high overall requirements for equipment, they are generally high-end configurations. Other API manufacturers also need nitrogen protection, and their nitrogen use process is more like a fine chemical plant. Usually the purity is 99-99.9%, but the dosage varies with the size of the factory, but it is much larger than the medical nitrogen generator. Like Zhejiang Pharmaceutical Co., Ltd. and Yongning Pharmaceutical Factory, the hourly consumption is 300 cubic meters. Nitrogen production equipment in food industry is mainly used for food preservation and cold storage. The patented post-purification system of Ritchie Air Separation Equipment Co., Ltd. ensures that the product gas is sterile, dust-free and odor-free, and eliminates the superiority of using nitrogen in food production enterprises. Nitrogen generator in electronic magnetic materials industry includes many branches, mainly piezoelectric crystal, semiconductor and lead-free welding.