Air Separation Equipment for Chemical Industry

The air separation equipment for chemical industry specially built by Shenger Gas uses redundant design and reinforced materials to cope with the complex operating environment and potentially corrosive atmosphere of chemical industry parks. This equipment not only has a very high level of automation, enabling unattended and remote monitoring, but also follows the highest standards in safety interlocking and explosion-proof design. Whether it is providing high-purity oxygen for large ammonia plants, methanol hydrogen production units, or providing sealing nitrogen for petrochemical plants, this system is the core equipment to ensure the continuity, safety and economy of your production process.

Working principle 

After the ambient air is initially purified by the high-efficiency filter, it enters the main air compressor for compression. Subsequently, the compressed air enters the pre-cooling system and molecular sieve adsorber, where impurities such as moisture, carbon dioxide, and hydrocarbons are completely removed. This is the key to ensuring the long-term safe operation of the equipment. The purified dry air undergoes countercurrent heat exchange with the returning low-temperature product gas in the main heat exchanger and is cooled to close to the liquefaction temperature (approximately -172°C to -196°C). Thereafter, the liquid air enters the dual-tower distillation system that includes a pressurized tower and an atmospheric tower. It uses the differences in boiling points of the oxygen, nitrogen, and argon components to perform multiple partial evaporations and partial condensations. Finally, high-purity nitrogen is obtained at the top of the tower, and high-purity oxygen is obtained in the tower still, from which the by-product argon can be extracted.

Industrial applications

• Synthesis gas production: Provide high-purity oxygen for coal gasification and natural gas reforming to produce synthesis gas (ammonia, methanol).
• Oxidation process: used for oxidation reactions in the production of ethylene oxide, propylene oxide, vinyl chloride, etc.
• Atmosphere protection and purging: High-purity nitrogen is used for purging, replacing and sealing reactors, tower tanks and pipelines to prevent explosion and oxidation.
• Fluid Catalytic Cracking (FCC): Provides oxygen-rich air to assist combustion, improving productivity and energy efficiency.
• Sulfur recovery process: Provide oxygen to the Claus unit and improve sulfur recovery rate.

Advantages, limitations and selection suggestions

1. Core advantages:

• High reliability and continuity: Designed specifically for continuous production in the chemical industry, the annual operating time can reach more than 99%.
• Large-scale and economical: Under large flow requirements, the unit gas cost is much lower than outsourcing or other separation technologies.
• High-purity products: can stably produce any grade of oxygen and nitrogen required for chemical processes.
• Enhanced safety design: For the chemical environment, the molecular sieve's adsorption capacity for hydrocarbons has been strengthened and equipped with a complete safety interlocking system.

2. Limitations:

• Higher investment costs: The initial capital investment for large equipment is relatively large.
• Long start-up cycle: It takes a long time to go from cold start to full production.
• The operation requires high professionalism: a professionally trained team is required for operation and maintenance.

3. Selection and maintenance suggestions:

• The key to selection: the end use, peak and average gas consumption, product purity and pressure level, future expansion possibilities, and on-site utility conditions must be clearly defined.
• Maintenance note: focus on the molecular sieve replacement cycle, status monitoring of high-speed rotating equipment such as expanders, and vacuum maintenance of low-temperature equipment in the cold box. It is recommended to sign a long-term technical service agreement with the manufacturer to ensure access to original spare parts and professional diagnostic support.

Technical Standards and Certifications

The design and manufacture of Shenger Gas adheres to the strictest international standards to ensure absolute safety in hazardous environments.

• Pressure vessels and piping: Comply with ASME Boiler and Pressure Vessel Code (BPVC) and ASME B31.3 Process Piping.
• Quality management system: Passed ISO 9001:2015 quality management system certification to ensure quality control throughout the entire process.
• Functional safety: Safety instrumented systems (SIS) comply with the IEC 61511 standard.
• Environment and occupational health and safety: The system complies with ISO 14001 and ISO 45001 requirements.

Air separation equipment for chemical industry is not just a cold steel combination, but carries our unremitting pursuit of safety, energy efficiency and reliability. From preliminary consultation, customized engineering design to installation and commissioning and full life cycle services, Shenger Gas is your trustworthy partner. Choosing Shenger Gas means choosing a solid and reliable gas heart for your chemical equipment. Contact us now to get exclusive technical solutions.

Shenger's products are divided into the following categories: various gas purification devices, PSA nitrogen plant, PSA oxygen plant, VPSA oxygen plant, waste heat regeneration air dryers, heatless regeneration dryers, micro-heat regeneration dryers, refrigerated type Dryers, combined dryers, cryogenic air separation plants, etc.

Our products are widely used in metallurgy, electric power, chemical, petroleum, electronic, biological, pharmaceutical, chemical fiber, food, rubber and other industries.

 

 

 

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