Agilent Refinery Gas Analyzers with Large Valve Oven

Importance of the topic

Refinery gas analysis is essential for petrochemical and energy sectors due to the variable composition of feed gas streams and the need for accurate and reproducible data on hydrogen, permanent gases, hydrocarbons and sulfur compounds. Reliable gas analysis supports process control, safety and product quality optimization.

Objectives and Study Overview

This document presents the design and capabilities of the Agilent Large Valve Oven Refinery Gas Analyzer. The focus is on rapid, flexible analysis of complex gas mixtures, streamlined method implementation, workflow development and carrier gas optimization to reduce operating costs and downtime.

Methodology and Instrumentation

The system employs a three-channel configuration on an Agilent 7890B gas chromatograph with an external valve oven for precise isothermal control of valves and columns. Detector suite includes dual thermal conductivity detectors and a flame ionisation detector. Column arrangements vary from micro-packed to standard packed PLOT columns. Carrier gas options include helium or hydrogen with nitrogen. Each instrument is factory configured, chemically tested and validated before shipment. On-site installation by certified engineers ensures method performance verification and optional startup assistance.

Instrumental Setup

• Gas chromatograph model 7890B with Large Valve Oven
• Three parallel analysis channels
• PLOT and micro-packed columns or 1/8 inch packed columns
• Detectors: TCD, TCD, FID
• Carrier gases: helium or hydrogen with nitrogen
• Isothermal control of oven at set temperature (eg 70 °C)
• Compliance with UOP 539 and ASTM D1945 and D1946 methods

Main Results and Discussion

The fast refinery gas analyzer delivers complete hydrocarbon and permanent gas profiles in under nine minutes with reproducibility below one percent relative standard deviation. The high-capacity version completes a full C1 to C5 analysis with backflush in under seventeen minutes. Detection limits reach 0.01 percent for most components, 500 ppm for hydrogen sulfide and 300 ppm for carbonyl sulfide. Chromatograms demonstrate clear separation of carbon dioxide, ethane, hydrogen sulfide, oxygen, methane and carbon monoxide with stable response for hydrogen quantification.

Benefits and Practical Applications

• Rapid turnaround times boost laboratory throughput
• Isothermal control enhances reproducibility and stability
• Flexible carrier gas options reduce operating costs and dependency on helium
• Multiparameter analysis in a single injection streamlines workflows
• Compliance with industry standards ensures data consistency

Future Trends and Applications

Advances may include integration of advanced detectors, further cycle time reduction, remote diagnostics and machine learning algorithms for data interpretation. Customized gas chromatograph and GC/MS modules can address emerging analytical challenges in energy, environmental monitoring and process intensification.

Conclusion

The Agilent Large Valve Oven Refinery Gas Analyzer offers a robust solution for high-speed, reproducible analysis of complex refinery gas mixtures. Its modular design, rapid cycle time and carrier gas flexibility support industry requirements for cost-effective and reliable gas analysis.

References

1. ASTM D1945 2014 Standard Test Method for Analysis of Natural Gas by Gas Chromatography
2. ASTM D1946 2011 Standard Test Method for Analysis of Natural Gas by Gas Chromatography
3. UOP 539 2012 Determination of Components in Refinery Gas by Gas Chromatography