Cryogenic Nitrogen For Petrochemical Plant

Cryogenic nitrogen for petrochemical plant is a large-scale nitrogen generation system designed for petrochemical, chemical, and refining industries. It employs advanced cryogenic air separation technology, using air as the feedstock and separating high-purity nitrogen through multiple stages of compression, purification, heat exchange, and distillation. The system enables long-term, stable operation with nitrogen purity up to 99.999% and a wide flow range, making it suitable for key applications such as refinery operations, catalyst regeneration, equipment purging, tank blanketing, and chemical process inerting.

Product Features

• High-Purity Output: Nitrogen purity ranges from 99.9% to 99.999%, with optional liquid nitrogen production.
• Continuous Operation: Designed for a service life of over 20 years, ensuring high operational stability.
• Energy-Efficient Design: Equipped with plate-fin heat exchangers and high-efficiency turbo expanders for low power consumption and excellent heat transfer performance.
• Automated Control: Integrated DCS/PLC control system enables one-button start/stop and remote monitoring.
• Modular Construction: Cold box, compression system, and piping are modularly assembled for easy transportation, installation, and maintenance.

Working Principle and Structure

After compression, the air enters the precooling and purification system, where moisture, CO₂, and hydrocarbons are removed. The purified air is then deeply cooled through the main heat exchanger and directed into the distillation column system under cryogenic conditions. In the high-pressure column, nitrogen-rich vapor is separated and further rectified in the low-pressure column to produce high-purity nitrogen. The product gas is reheated before delivery, while liquid nitrogen byproduct can be recovered from the cold box, achieving integrated utilization of both energy and gas products.

Main Technical Parameters

Note: The above data represent typical design parameters. Customization is available based on site conditions, gas demand, and installation requirements.

Temperature and Energy Consumption Indicators

• Operating Temperature Range: −190 °C – −150 °C (top temperature of the low-pressure column)
• Cold Box Temperature Difference (ΔT): ≤ 2 K
• Specific Power Consumption: 0.28 – 0.32 kWh/Nm³ (based on nitrogen output)
• Cold Energy Recovery Efficiency: ≥ 96%

Industrial Applications and Reference Scenarios

The cryogenic nitrogen for petrochemical plant is widely used in:

• Reactor inerting, pipeline purging, and tank blanketing in refinery and petrochemical units;
• Gas protection and pressurization in methanol, ammonia, and olefin plants;
• Liquid nitrogen applications for low-temperature cooling, cold traps, and cryogenic recovery;
• Explosion prevention and fire suppression in hazardous chemical areas.

Application Description:
In typical petrochemical production processes, high-purity nitrogen produced by cryogenic air separation is used for inerting reactors, storage tanks, and transfer pipelines, effectively preventing oxidation, explosion, and contamination risks.
By properly designing nitrogen flow capacity and purity grade, the system can meet purging, protection, and cooling requirements across different production units. It supports continuous operation and liquid nitrogen byproduct recovery, making it suitable for medium- and large-scale chemical complexes, integrated process plants, or centralized gas supply stations.

Certifications and Standards

• Complies with ISO 9001 and ISO 14001 quality and environmental management system certifications
• Major pressure vessels, heat exchangers, and storage tanks are certified with the ASME U Stamp
• Electrical systems meet IEC and CE international standards
• Refrigerants and materials conform to PED 2014/68/EU requirements

Shenger Gas is a manufacturing and integration company specializing in industrial gas equipment and system engineering. The company has been engaged in the research, development, and production of cryogenic air separation units, PSA/VPSA oxygen and nitrogen systems, and related auxiliary equipment for many years.
With mature process design and manufacturing capabilities, Shenger Gas provides stable and reliable cryogenic nitrogen for petrochemical plant solutions tailored to different process requirements.
Through strict design control, quality management, and performance testing, the company consistently supplies efficient, energy-saving, and safe cryogenic nitrogen generation equipment and technical support to customers worldwide.

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