BID Ultra-Fast Refinery Gas Analyzer Nexis GC-2030 BIDUFRGA

Significance of the Topic

The precise and rapid determination of natural gas composition underpins reliable calculation of heating values and relative densities, crucial for energy management, safety monitoring and regulatory compliance in the oil and gas sector.

Study Objectives and Overview

This study presents the performance of the Shimadzu Nexis GC-2030 BID Ultra-Fast Refinery Gas Analyzer (BIDUFRGA) system for comprehensive analysis of natural gases and related mixtures, covering permanent gases, light hydrocarbons and sulfur compounds within regulatory concentration ranges.

Methodology

The system employs three sample loops and a pre-column backflush to remove C6+ as a single peak. Sequential valve switching directs C1–C5 hydrocarbons onto an alumina capillary column with FID detection, while H2, O2, N2 and CO are separated on a MS-5A column and CO2, C2H4, C2H6, C2H2, H2S on an Rtx-Q Plot column, both detected by BID. Total cycle time is approximately 5.5 minutes. Linear detector responses simplify calibration over wide dynamic ranges.

Instrumentation Used

• Shimadzu Nexis GC-2030 system
• Three pneumatic valves
• One packed pre-column, one Alumina capillary column, one MS-5A column, one Rtx-Q Plot column
• Two detectors: Flame Ionization Detector (FID) and Barrier Discharge Ionization Detector (BID)
• LabSolutions workstation with BTU and Specific Gravity calculation modules

Major Results and Discussion

Typical BID chromatograms demonstrate baseline separation of permanent gases and light unsaturates within 4.5 minutes. FID traces resolve C1–C6+ hydrocarbons with clear peak shapes and minimal co-elution. The system achieves detection limits down to 0.01% for most components and maintains linearity across stated concentration ranges. Rapid cycle times enable high sample throughput without compromising resolution.

Benefits and Practical Applications

• High-speed analysis reduces cycle time to under 6 minutes
• Simultaneous multi-component detection streamlines workflows in refineries and QA/QC labs
• Simplified calibration due to linear detector response
• Software integration allows automated calculation of heating value and relative density

Future Trends and Applications

Future developments may include integration of mass spectrometric detection for enhanced compound identification, miniaturized portable GC systems for field analysis, and AI-driven data processing for predictive maintenance and real-time process control.

Conclusion

The Nexis GC-2030 BIDUFRGA system offers a robust and rapid solution for comprehensive natural gas analysis, balancing speed, sensitivity and automation to support energy industry operations and environmental monitoring.

References

Shimadzu Corporation. SGC-ADS-0126B: System Gas Chromatograph BID Ultra-Fast Refinery Gas Analyzer; First Edition November 2017.