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H₂S Analysis in Natural Gas Processing

H₂S Analysis in Natural Gas Processing

Monitoring Sweetening Performance & Sweet Gas Quality — H2S-625

Gas processing plants remove hydrogen sulfide from raw natural gas using amine treating and other sweetening processes before the gas can be sold into the pipeline. Confirming H2S removal performance requires monitoring at multiple points, from the acid gas feed to the sulfur recovery unit through to the treated sweet gas leaving the plant.

The H2S-625 analyzer gives process engineers continuous visibility into H2S levels at these critical points, helping verify treating performance and protect downstream equipment and personnel.

  • Amine Unit Verification
  • Sweet Gas Quality
  • Sulfur Recovery Feed
  • プロセス安全

Why Inert Blanket Verification Matters

If an amine sweetening unit underperforms, treated gas can leave the plant with H2S above pipeline specification, risking contract rejection and corrosion in downstream infrastructure. Continuous H2S monitoring at the sweet gas outlet, combined with checks on the acid gas feed to sulfur recovery, lets operators catch treating upsets quickly and protect both product quality and worker safety around sour process streams.

Where It's Used

  • Amine contactor outlet monitoring — verifying treating unit performance in real time
  • Sweet gas quality verification — confirming pipeline specification is met before sale
  • Acid gas feed monitoring to sulfur recovery units — tracking feed composition
  • Flare gas H2S monitoring — supporting environmental and safety reporting

Recommended Analyzer

H2S-625 Continuous H₂S Process Analyzer

The H2S-625 delivers stable, continuous hydrogen sulfide measurement across the ppm ranges typical of gas processing streams, with a sensor designed for demanding sour service.

Multiple H2S-625 units can be deployed across a processing train — feed, contactor outlet, and sweet gas — to build a complete picture of treating performance from one control room.

  • Continuous Online Output
  • Sour Service Sensor
  • 4-20 mA / HART Output
  • Multi-Point Deployment

主な仕様

  • Range: ppm-level, matched to sweet gas specification requirements
  • Sensor technology: electrochemical sensor suited to amine unit process gas
  • Sample conditioning: compatible with standard sample conditioning systems for wet, sour streams
  • Output: 4-20 mA and HART for DCS integration across multiple monitoring points
  • Enclosure: process-rated housing for plant installation

よくある質問

Trace oxygen measurement provides a direct indication of oxygen contamination or crossover into the hydrogen stream. Trending the oxygen concentration can help operators identify changes in electrolyser or purification system performance.

A common measurement point is the hydrogen product stream downstream of the electrolyser stack. Additional measurement points may be used before or after drying and purification equipment depending on the process design and monitoring objectives.

Alarm and control limits should be determined based on the electrolyser manufacturer’s specifications, process conditions, applicable standards, and the facility’s safety requirements rather than using a universal oxygen alarm value.

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