Oxygen enriched oxygen generator is a pressure swing adsorption oxygen generator developed and produced by the company for industrial boiler, glass industry, metallurgical industry, petrochemical industry, iron and steel industry, cement industry, ceramic cellar furnace industry and other industries requiring oxygen combustion.
Oxygen generator production plant for oxygen enriched combustion supporting metallurgy
Special oxygen generator for oxygen combustion is based on the principle of Pressure Swing Adsorption. Pressure swing adsorption (PSA) is an advanced gas separation technology and plays an irreplaceable role in normal temperature gas production. Air as the air source, the use of pressure swing adsorption technology to separate the air to obtain oxygen equipment. The purified compressed air enters the bottom of the adsorption tower, and the tower is filled with zeolite molecular sieve, which absorbs most of the nitrogen, and realizes the separation of oxygen and nitrogen under the action of pressure swing adsorption. Due to the selective adsorption characteristics of molecular sieve, nitrogen is adsorbed in zeolite molecular sieve, oxygen is enriched in the gas phase, and is output as a product.
Advantages of oxygen-enriched combustion oxygen generator:
① The energy saving effect significantly improves the combustion thermal efficiency, and the average fuel saving (gas) is 20%-40%, which significantly improves the heat energy use efficiency.
② Effectively prolong the furnace life
The optimization of the combustion environment makes the temperature distribution in the furnace more reasonable and effectively prolongs the service life of the kiln and boiler.
③ Outstanding environmental protection effect
The solid unburned matter carried in the flue gas is fully burned, the blackness of the exhaust smoke is reduced, the combustible harmful gas formed by combustion decomposition is fully burned, and the production of harmful gases is reduced. The amount of exhaust smoke is significantly reduced to reduce thermal pollution.
Process flow of oxygen-enriched combustion oxygen generator
The special oxygen generator is composed of five parts: air compressor system, compressed air purification system, PSA adsorption oxygen system, oxygen buffer filtration system and oxygen storage system.
(Oxygen production process is shown below)
The oxygen production host adopts PSA air separation method, which is a pollution-free pure physical oxygen production method. The raw material for oxygen production is the air around us. The oxygen produced has unparalleled advantages such as high concentration, natural, clean, green environmental protection, safety, and low usage cost. It represents the development direction of the oxygen production field and the future of healthy oxygen health care. It is an advanced oxygen production method. In recent years, with the continuous improvement of the process flow and the application of new molecular sieves, the level of pressure swing adsorption air separation oxygen production technology has rapidly improved, and the technology is now very mature.
Advantages of Oxygen Generator
Progressiveness
- Using air as raw material, on-site oxygen production and use, oxygen does not need to be transported or canned, making it easy to use. Oxygen pressure can be adjusted as needed;
- Compressed air is equipped with air purification and drying treatment, providing clean compressed air raw materials that are beneficial for extending the service life of molecular sieves;
- Advanced joint control system, PLC touch screen control and display, fully automatic operation, highly intelligent, realizing joint operation of multiple units, and capable of remote monitoring and management. Improve the level of oxygen supply management by establishing a more institutionalized, scientific, and modern model.
Security
- PSA technology produces oxygen through physical means at room temperature and low pressure, without the need for transportation and packaging, greatly reducing safety hazards.
Economic viability
- Using PSA oxygen production, based on physical principles and using surrounding air as raw material, it is economical, environmentally friendly, low energy consumption, high efficiency, reduces unit oxygen costs, and has quick investment returns.
- The equipment structure design is compact, reducing the footprint. Optimized process flow, more efficient and energy-saving.
Due to different industries, the selection requirements for oxygen concentrators are also different. This article provides a brief analysis of the selection requirements for oxygen concentrators in the steel industry.
- Basis for selection of oxygen concentrator
(1) Although the gas consumption of steel enterprises varies from time to time, it can be balanced by storing it in spherical tanks during low and peak hours based on the average hourly gas consumption. The gas in the peripheral comprehensive pipeline is transported to the user area through medium pressure pipelines, and the pipeline is pressurized at an average usage rate higher than one level before being sent to the user. As the oxygen used for oxygen enriched coal injection in blast furnaces, the basic average usage is used to calculate the oxygen, nitrogen, and argon usage of the entire enterprise, which serves as the basis for selecting the type of oxygen concentrator.
(2) The gas used by steel enterprises is mainly in gaseous form. At present, the oxygen concentrator process is divided into two types: gas external compression and internal compression. The internal compression process involves compressing the liquid oxygen pump to 3.0MPa to recover the cooling capacity, and the gas is discharged from the tower. The external compression process is to recover the cooled gas oxygen from the tower, and then compress it to 3.0MPa through a gas compressor before sending it out. Starting from the purpose of energy conservation and consumption reduction, a fully low-pressure, external compression process that mainly produces gas should be chosen. The energy consumption of the internal compression process is slightly higher, and the investment and operating costs are also high.
(3) Steel companies generally undergo major repairs once a year, while the maintenance cycle for oxygen concentrators is usually every two years. During the overhaul period, the oxygen generator may experience gas venting. A large steel enterprise with a production capacity of over ten million tons has workshops for maintenance every month on average throughout the year. However, considering the peak and off-season sales seasons in the market, sometimes there may be two or more workshops undergoing maintenance simultaneously. Although the venting volume can be adjusted by the blast furnace to achieve gas balance, the selection of oxygen concentrators should also accurately consider the amount of gas used and minimize the venting volume as much as possible.
(4) Gas external supply can be both gas and liquid, so when choosing an oxygen concentrator, it is necessary to consider a portion of the liquid and gas external supply. Generally, oxygen concentrators can produce some liquid oxygen and liquid nitrogen. The amount of liquid oxygen can reach 3% of the amount of oxygen gas. If more liquid needs to be supplied, gas liquefaction equipment can be selected to make up for it. The storage system is equipped with external liquid supply and gas to cope with the gas consumption during shutdown due to faults.
(5) The production of steel enterprises has the characteristic of uninterrupted operation, especially for oxygen, nitrogen, and argon used in blast furnaces and converters. It is absolutely not allowed to stop the production of oxygen concentrators. Therefore, the selection of oxygen concentrators must consider long-term safe, stable, and reliable operation.
(6) With the improvement of product grades and technological equipment in steel enterprises, the requirements for gas quality are becoming increasingly high. Previously, oxygen could be blown even with lower purity, but now oxygen cannot be supplied when the purity is below 99.2%; The purity of nitrogen used as protective gas in blast furnaces is required to be above 99.99%. As for argon gas, it plays a crucial role in the quality of steel, especially high carbon steel. So, the quality of oxygen concentrator products is quite important, and it must also meet the requirements for external gas supply.