What should we pay attention to when using special gases?

Gas cylinders in special production occasions shall be placed vertically when they are used, and special iron frames shall be available as far as possible. The gas accessories shall be special accessories and shall not be used with other gas accessories, such as pressure reducing valve, flowmeter, pressure gauge, etc. The sealing of high pressure vessel for high-purity gas before it is used for unsealing, and there is no leakage at all parts and connections; Before use, purge the valve port to prevent dust from entering the pipeline or pressure reducing valve.

The operator of the high pressure vessel shall stand on the side of the air valve connecting pipe and slow down the operation to prevent the air flow from blowing out and hurting people. Industrial gas operators need to have relative gas knowledge points, be familiar with safe operation procedures, and have experience in dealing with accidents; In case of leakage during use, the cause of gas leakage shall be found quickly, and the gas can be used again after troubleshooting.

The gas cylinder shall be far away from the heat source, and the safety distance shall be more than 3m, so as to ensure that the temperature of the container is lower than 40 ℃, which can ensure the safety. The mobile gas cylinder shall not hold the valve handle to prevent potential safety accidents caused by misoperation. High pressure vessels shall not be knocked randomly to avoid vibration. When using the end paragraph, pay attention to the need to close all valves, including pressure reducing valve and bottle valve; Be careful not to tighten the valve tightly to avoid irreversible damage to the valve, which is difficult to open next time. Operators of the gas consuming unit shall stick to their posts and be conscientious and responsible. When it is confirmed that there is gas in the high-pressure vessel, the inert gas shall be used for internal replacement or evacuation before inspection; The maintenance or cleaning equipment shall also be used to replace the internal residual gas with inert gas such as nitrogen.

When using the gas, the user should pay attention to that the residual pressure in the cylinder should be about 0.5Mpa. All kinds of gas cylinders need to be tested regularly and can only be used after the pressure test is qualified.

What are the main uses of high-purity gas? Various chemical gases are widely used in industrial production, national defense industry and all walks of life. Now, the application scope of common chemical gases is briefly and detailedly introduced for industrial gases.

High purity gas

Nitrogen is a rare gas, accounting for a large proportion in the air, accounting for about 78%. With the trend of scientific and technological progress, nitrogen is increasingly used in various fields of social economy. The main use of nitrogen is to maintain gas, remove gas, carrier gas, dry gas, etc. Nitrogen, as a holding gas, plays a direct role in improving the quality and smoothness of metal composites and parts during the whole process of metal material heat treatment. High purity nitrogen is an indispensable protective gas and carrier gas in the production process of semiconductor materials integrated circuit chips in the electronic industry. Nitrogen, as the protective gas and carrier gas of petrochemical industry, is the guarantee for the success of petrochemical production and manufacturing. Nitrogen is also the key feed gas for the production and manufacturing of synthetic ammonia process, which is the guarantee for the success of petrochemical production. In the production of flat glass in the building materials industry, nitrogen, as the main protective gas of tin bath, can realize the float production process and improve the quality of laminated glass. Nitrogen is used to strengthen mining and fire fighting in the energy industry. Nitrogen is used to add air into food packaging materials, dry vegetables and fruits with nitrogen, store them in cold storage, and fill juice and peanut oil with nitrogen to absorb oxygen. Liquid nitrogen is used as refrigerant and ultra-low temperature source is used for diagnosis and treatment. Nitrogen can also be used in rocket launching, indoor simulation of space simulation, atomic reactor, gas laser generator and other new technical fields.

The main use of CO2 is extensive, it only needs secondary oxygen. CO2 can be made into soda water. Carbon dioxide is a kind of foam fire extinguisher widely used in electrical equipment, instruments, precious production line equipment, books and archives, etc. CO2 gas shielded welding can be widely used in electric welding of various raw materials. Carbon dioxide used in analytical chemistry production can produce various common chemical raw materials, such as urea solution, sodium salicylate, etc. CO2 is used as refrigerant and freeze. Using carbon dioxide as raw material can realize ultra-low temperature heat source power generation. Supercritical extraction using CO2 as an organic solvent is a practical technology, which can separate different products and replace traditional handicrafts. Solid carbon dioxide (liquid nitrogen) can be used for diagnosis and treatment of skin diseases, as well as artificial rain drive. The use of liquid carbon dioxide dry cleaners can replace harmful detergents. In the electronic industry, high-purity carbon dioxide is used, diagnosis and treatment scientific research and disease diagnosis, calibration test instruments and other special mixed gases are used.