What is the compressed air pressure generally required by steel companies

As a pillar industry of the national economy, the steel industry has diversified demand for compressed air in its production processes. According to the production process characteristics and equipment operation requirements, the compressed air pressure required by steel companies is usually distributed in the following ranges:

1. Core process pressure requirements

1. Blast furnace ironmaking system
   • tuyere blowing: A pressure of 0.4-0.6MPa is required for pulverized coal or natural gas injection to ensure full combustion of fuel.
   • top equipment: A pressure of 0.6-0.8MPa is required to drive actuators such as the roof distributor and material flow regulating valve.
2. Converter steelmaking system
   • bottom blowing system: A pressure of 1.2-1.6MPa is required to stir the molten steel through the bottom blowing element to promote uniform composition.
   • oxygen Lance lifting: A pressure of 0.5-0.7MPa is required to control the position accuracy of the oxygen lance and ensure smelting efficiency.
3. Continuous casting process section
   • mold oscillation: A pressure of 0.4-0.6MPa is required to drive the vibration device to prevent the casting billet from adhering.
   • Tension and straightening machine system: A pressure of 0.6-0.8MPa is required to provide traction force for the billet and control the stability of the casting speed.

2. Auxiliary system pressure requirements

1. power execution system
   • pneumatic valve: A pressure of 0.4-0.6MPa is needed to control the opening and closing of key valves such as gas pipelines and dust removal systems.
   • dust removal device: A pressure of 0.3-0.5MPa is needed to drive the dust cleaning system of the bag filter to maintain environmental emission standards.
2. instrument control system
   • pneumatic instrument: A pressure of 0.14-0.7MPa is required to provide power source for pressure transmitters, flow meters, etc.
   • analytical instruments: A pressure of 0.2-0.3MPa is required to ensure the stable operation of precision instruments such as spectrometers and mass spectrometers.
3. surface treatment system
   • blast cleaning: A pressure of 0.5-0.7MPa is needed to remove the oxide scale on the surface of the steel and improve the adhesion of the coating.
   • painting equipment: A pressure of 0.3-0.5MPa is required to drive the spray gun to achieve uniform coating coverage.

3. Special process pressure requirements

1. Steel rolling process section
   • laminar cooling: A pressure of 0.8-1.0MPa is required to control the temperature accuracy of the strip and optimize the mechanical properties.
   • Straightener system: 1.0-1.2MPa pressure is needed to eliminate rolling stress and improve plate flatness.
2. Energy media system
   • gas pressuring: A pressure of 0.3-0.4MPa is needed to improve the transportation efficiency of blast furnace gas and converter gas.
   • Nitrogen preparation: A pressure of 0.6-0.8MPa is required to provide inert gas for refining furnace and continuous casting.

4. Pressure matching principles

1. Process adaptability: Set the pressure parameters according to the requirements of the equipment manufacturer. For example, the pressure on the vibrating table of the continuous casting machine needs to match the section size of the cast billet.
2. pipe network economics: Adopt a graded gas supply system, and high-pressure equipment (>0.8MPa) and low-pressure equipment are set in a shunt to reduce energy loss.
3. safety redundancy: A safety margin of 20%-30% must be retained for the gas supply pressure of key equipment to deal with sudden load fluctuations.

The compressed air pressure configuration of steel companies needs to take into account process requirements, equipment characteristics and energy efficiency management. It is recommended to establish a pressure monitoring system and implement dynamic pressure management at gas consumption points across the plant to ensure production stability and avoid energy waste. For new projects, variable frequency air compressors and intelligent pipe network control systems can be used to achieve precise pressure control, and the comprehensive energy saving rate can reach 15%-25%.