Process instrumentation for Air Separation Units (ASUs)
Air separation units (ASUs) separate air into nitrogen and oxygen. The process relies on cryogenic distillation, which capitalizes on the different boiling points of these gases at low temperatures. ASUs supply nitrogen for ammonia synthesis and this nitrogen is subsequently combined with green hydrogen in a reactor. Accurate process measurement equipment is vital to minimize safety risks and ensure efficient operations and high-quality industrial gases.
Parameters
Focus on key process parameters
Monitor pressure in the compressor reliably
Monitoring pressure is essential to ensure ideal intake conditions and to protect the compressor from damage due to low or fluctuating pressure.
Maintain compressor safety with Endress+Hauser pressure transmitters
Pressure measurement in ASU compressors faces significant challenges due to extreme operating conditions. High pressures, often exceeding 100 bar, demand specialized sensors. Pressure pulsations and vibrations caused by compressor operation can damage sensors and skew readings. Cerabar PMP71B provides:
Robustness and longevity
Simple indication of device status - display changes from green to red when diagnostic messages occur
Reduce systematic failures thanks to error-free SIL commissioning and instrument guided proof testing
Enhance process safety with robust temperature sensors
Temperature measurement in ASU distillation columns presents unique challenges due to the cryogenic environment. Maintaining accuracy and stability at such low temperatures can be difficult, as sensor drift and calibration issues become more prevalent. iTHERM TM131 ensures:
Second process barrier with failure indication offering valuable health status information
Reliable level measurement with guided wave radar for enhanced reboiler efficiency
Level measurement in reboilers of ASU distillation columns poses challenges due to the cryogenic temperatures and multiphase flow conditions. The extreme cold can affect the accuracy of traditional level sensors, while the presence of both liquid and vapor phases can lead to inaccurate readings. Specialized level measurement with Levelflex FMP54 offers:
Reliable measurement even for changing product and process conditions
Highest reliability due to new Multi-Echo Tracking evaluation
Hardware and software developed according to IEC 61508 up to SIL3
Discover why we're the right partner for sustainable, efficient ammonia and hydrogen production
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