How Much Do You Know About The Air Separation Unit Operation Control System?

As a global high-end gas solution provider and a trusted air separation plant manufacturer from China, NEWTEK is dedicated to advancing air separation technology. NEWTEK's Air Separation Units (ASUs) adopt mature cryogenic distillation technology, which separates oxygen, nitrogen, argon, and other gas components based on their different boiling points under the same pressure. These ASUs primarily use internal and external compression processes, both equipped with advanced operation control systems to ensure stable and efficient performance.
 

Most of NEWTEK's newly designed ASUs are fitted with state-of-the-art DCS (Distributed Control System). This core control technology has been fully validated in the company's global projects, including the 4x40000Nm³/h ASU project in Peru, the 51000Nm³/h system in the Philippines, and the 30000Nm³/h project in Ghana. The DCS enables seamless interlock protection and anti-surge control for air compressors, sequence control for molecular sieve purification systems, and precise regulation of key parameters like temperature and pressure in distillation columns. Its application has streamlined equipment operation, enhanced overall control levels, and underpinned the reliable performance of over 9,000 NEWTEK systems worldwide.
 

To achieve automatic variable load control, multivariable predictive control, and optimal operational efficiency, NEWTEK focuses on the following key aspects for its ASU control systems:
 

Air Compressor Anti-Surge Optimization

The air compressor is the power core of ASUs. NEWTEK's proprietary anti-surge control algorithm prevents compressors from entering the anti-surge zone during low-load operation, ensuring safety under variable working conditions. High-precision inlet guide vane controls offer excellent responsiveness and stability, as demonstrated in the energy-efficient optimization of the 45,000m³/h ASU, reducing compressor load and boosting system stability.

Distillation Tower Stability Across Full Load Ranges

The distillation tower is critical for gas separation purity and yield. NEWTEK's optimized tower structure and DCS control strategy enable real-time monitoring of temperature gradients, pressure differentials, and liquid levels. Dynamic parameter adjustments ensure high stability across full load ranges, meeting the strict requirements of diverse applications-from large-scale steel mill ASUs to modular medical oxygen systems for Philippine government hospitals.
 

High-Precision Instrumentation & Minimal Measurement Lag

Accurate on-site data is fundamental to effective control. NEWTEK selects world-class high-precision sensors and transmitters to measure temperature, pressure, flow, and composition. Optimized instrument layout and signal transmission minimize measurement lag, ensuring real-time, reliable data for timely control responses-critical for ASU operations in chemicals, healthcare, and new energy sectors.
 

On-Site Instruments Meeting High Accuracy & Responsiveness Requirements

NEWTEK's on-site instruments are rigorously selected to withstand harsh ASU environments (ultra-low temperatures, high pressure, corrosive gases) while maintaining exceptional accuracy and rapid response. This ensures the control system promptly detects operational deviations and adjusts accordingly, avoiding safety hazards and production losses.
 

As a globally influential air separation plant manufacturer from China, NEWTEK integrates its control systems with sustainability. The systems seamlessly connect with energy-saving technologies (e.g., heat recovery, optimized refrigeration cycles), as proven in the 45,000m³/h ASU energy optimization project-delivering measurable reductions in steam consumption, compressor load, and overall energy demand. Additionally, the control systems support integration with Carbon Capture, Utilization, and Storage (CCUS) technology, aiding global customers in industrial decarbonization.

With years of industry expertise, NEWTEK has earned widespread global recognition. A long-term customer noted: "NEWTEK's ASUs offer stable performance and reliable control systems that fully meet our industrial needs." Moving forward, NEWTEK will continue to innovate, integrating AI and big data into ASU control systems to deliver more efficient, stable, and intelligent air separation solutions for industries worldwide.