According to the national economic and social development in the Twelfth Five Year Plan "period, 12th Five-Year, non fossil energy in primary energy consumption to 114% unit GDP energy consumption and carbon dioxide emissions reduction of 16% and 17%. on this situation respectively, during 12th Five-Year, more arduous task of energy-saving and emission reduction of iron and steel enterprises, laws and regulations more strictly.
As a typical high energy consumption and large industrial enterprises, vigorously carry out the work of energy-saving emission reduction of iron and steel enterprises, not only must yuan the task but also an important social responsibility.
In the iron and steel enterprises all the energy consumption of compressed air energy consumption accounted for a considerable proportion (about the enterprise total power consumption of the 5%-15%) energy medium compressed air as the iron and steel enterprises in common use, from production, transportation and use of all aspects should be paid more attention to the strict management and technical improvement to adapt to the situation of energy saving and emission reduction.
In this paper, the energy saving potential and Countermeasures of compressed air system in iron and steel enterprises are discussed in order to exchange and communicate with others.
1 the compressed air system in the iron and steel enterprises is summarized, such as technology, electricity market theory, data mining, data simulation and prediction, etc.
Shanghai energy saving 1.1 iron and steel enterprises in the air compressor station configuration in iron and steel enterprises, the types of hollow pressure stations are generally centrifuge air compressor station, screw air compressor station and hybrid air compressor station (centrifugal air compressor and screw air compressor). The piston type air compressor is being phased out and updated in some iron and steel enterprises.
The centrifuge air pressure station is usually set up with 2-9 centrifuges, and the volume of the exhaust is generally from 100m3/min to 300m3/min. According to the needs of production, it is generally set up as multiple exhaust pressure, such as 1.3MPa, of which 0.38MPa and 0.5MPa are mostly air compressors for steelmaking and continuous casting, 08MPa is power / instrument air compressor, 1.3MPa is air compressor for blast furnace coal injection.
There are 2-8 screw machines in the air compressor station of the screw machine, and the majority of the exhaust volume is less than 10m3/min-40m3/min. The screw machine is mostly used as the auxiliary gas source of the centrifugal air compressor.
According to the network of air pressure stations, it can be divided into two kinds of layout methods: distributed layout and centralized networking. With the air compressor equipment operation stability and control to improve the management level, the new iron and steel enterprise, generally used in this way in the distributed centralized network of old iron and steel enterprises, also is the transformation plan to establish network or regional network between the air compressor station.
12 the main use of compressed air and the use of gas in the steel enterprises in the use of compressed air is included in the various production links. Its main applications can be divided into: sintering pneumatic conveying, blast furnace injection, continuous casting steam cooling, converter bottom blowing, steel belt surface purging, all kinds of pneumatic instrument valves, pneumatic motors, pulse bag filters and so on.
Divide in station distribution can be divided into raw materials, sintering zone area, region and region in the coke oven blast furnace steelmaking unit is mainly used for compressed air equipment and purge and spray cooling with compressed air compressed air in the hot rolling unit is mainly used for equipment with gas blowing and heating furnace for rolling mill and pneumatic casting, converter gas dynamic air pressure unit in accordance with the production process of iron in cold rolling unit; the compressed air is used for blowing mill strip pickling, continuous annealing, galvanizing line of pneumatic equipment and air blowing.
In general, the output of compressed air through the cold and dry machine processing after the moisture content is reduced to 3-5C pressure dew point in the iron and steel enterprises compressed air compressor air system, as power (ordinary) with compressed air supply to the users; or through the cold and dry machine + adsorption dryer after treatment will reduce the water content to pressure dew point below -20C Teng dust in addition to the oil and dust particle size of less than 5m, the amount of dust is less than 5mg/m3, the oil content of not less than 1mg/m3, as the instrument with the compressed air supply to the users. In addition, the air water content of the compressed air for the continuous casting of steel, continuous casting, continuous casting, and mist cooling is directly supplied to the continuous casting of the air compressor.
2 the energy saving potential and Countermeasures of compressed air in iron and steel enterprises (21) a typical phenomenon of unreasonable use of compressed air, a, is used to supply high pressure gas to low pressure users.
Such as open air blowing injection (aeration and agitation in wastewater treatment process) transportation of water supply atomization dilution phase (dust dust transportation) and so on.
The air pressure in the above working conditions is low, and the air supply of the fan can be considered to reduce the energy waste caused by compressed air during the decompression process.
In addition, because of the high pressure or unreasonable supply pressure requirement of individual users, the air compressor station will increase the outlet pressure and increase the overall energy consumption.
The use of compressed air for the instrument is used as a common compressed air.
Such as Baosteel Baosteel engineering design according to the uniform provisions of instrument air requirements as "gas below the dew point of a 20C (condition) of dust particle size less than 5 m dust content less than 5mg/m3 of oil is not less than 1mg/m'meters with compressed air is generally through the air compressor and freezing dryer adsorption dryer after treatment by instrument the gas supply of ordinary gas is caused to pan occasion.
There is no specific data on the difference in the management level of different iron and steel enterprises with different conditions on the unreasonable use of compressed air. According to the US motor system challenge project and the practice experience of China's motor system energy saving, the reason for Xiao's unreasonable use can reach the energy saving effect of 5%~10%. (Note: 1, the US motor system challenge project: in 1993, the US Department of energy (USDOE) launched the motor system challenge project. The month is to improve the energy efficiency and environmental quality of the motor system in Shanghai. The challenge of compressed air is the emphasis of this project.