In the technological process of steel enterprises, the first thing is to sinter the ore. Afterwards, convey the sintered iron ore to the blast furnace. Smelt them into molten iron. It is then cast into iron ingots. In fact, each process of steel factories needs air compressors and turbo compressors.
Generally speaking, the compressed air consumption for steel metallurgy enterprises is very large. It can be from hundreds of cubic meters to thousands of cubic meters. Besides, most require compressed air treatment. In addition, a large metallurgy and metalworking enterprise has many sintering workshops, ironmaking blast furnaces, steelmaking plants, etc. And these workshops are widely distributed.
Therefore, it can set up many air compressor stations in general steel enterprises. So as to meet the air needs of various places. There are many benefits to doing this.
Air compressor usage for steel industry:
Firstly, each air compressor station can be relatively independent. It is convenient for the transformation of the station in the future. The second is to facilitate the management. Thirdly, we can set up different air compressor station systems for different air qualities. Fourth, it is convenient for the development of enterprises in the future. For steel enterprises, the usual layout of the compressed air system is as follows:
Sintering is the process of mixing iron ore with several other ores for combustion. So as to sinter them together. In the sintering workshop, there are many places that need compressed air. But the main purpose is the same. It is used for power actuators, such as cooperative actuators of ash unloading devices.
The compressed air pressure required here is generally 0.5MPa. The air quality requirements are not high. Generally, it can use an oil-injected rotary screw air compressor. Besides, there is no need to install the compressed air dryers.
A small number of places have gauges. Then, there should a heatless desiccant dryer andand oil removal filter on the branch of the air system pipeline. So that the quality of compressed air can meet the requirements of the instrument.
In addition, compressed air is also used for purging the instruments. Because the surrounding environment in the sintering workshop is poor. There is a lot of dust in the air. After a long time, dust will accumulate on some instruments. This requires blowing with compressed air. Here, the quality requirements for compressed air are generally 3-6-3. That is, solid particles level 3, moisture level 6, oil content level 3.
Next is the smelting process. Smelting blast furnace requires a lot of equipment to work together. These machines generally require air as a power source. The actuators of these devices require compressed air. For example, the pneumatic cylinder, the opening of the furnace door and other actions are all completed with the cooperation of the air compressor.
The pressure requirement for compressed air here is generally 0.5MPa. The quality requirements for compressed air are also very low, generally 3-6-3. But it uses a lot of air.
For example, there is a 2500m3 ironmaking blast furnace. There need four 40m3/min screw air compressors. Three are normally open and one acts as a backup machine. In addition, blast furnace combustion needs to inject coal ash. It is usually delivered by compressed air. But the pressure requirement of the compressed air here is generally 1.2MPa. The amount of compressed air is also quite large. The air quality requirements are not high. At this time, the exhaust pressure of the compressor must be at least 1.3MPa or above.
Blast furnace blast equipment generally uses high-pressure fans and turbo compressors. Usually the pressure is 0.2MPa. The air consumption of the above compressed air is also very large. And it does not require any air compressor dryers. In addition, there is a small part of compressed air that needs drying. That is, instrument air systems and instruments purge system. The quality grades of these compressed air are the same as above.