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Applied Analytics TLG-387 on-line Tail Gas Analyser

Supplier: B-R Controls

The TLG-837 in-situ tail gas analyser design adheres to the principle of no moving parts no moving sample in sulfur recovery applications. The TLG-837 measures H2S, SO2, COS and CS2 and uses solid state diode array spectrophotometer for detection, measuring complete spectrum from 190nm to 1100nm with 1nm resolution. It can readily be used for absorbance measurements of up to 2AU ± 0.0002AU. Allowing for a very wide concentration dynamic range and accurate measurements.

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The TLG-837 from Applied Analytics is a Multi Spectral Analyser which measures H2S, SO2, ratio H2S/SO2, COS, CS2 and which provides a significant performance improvement over conventional analysers.

The measurement of tail gas (H2S, SO2 and Ratio) is one of the most difficult applications in a refinery due to the nature of the sample and the number of contaminants present including COS, CS2, and NH3 which absorb in similar wavelengths to the target gases. It is imperative that these contaminants are measured and their effect removed from the total absorbance spectra to enable the accurate analysis of both H2S and SO2.

This can only be achieved by an analyser that measures a complete spectrum and not by a system that only measures three or four discrete wavelengths as there is insufficient absorbance information to solve for the number of components. Conventional analysers, utilising only a few wavelengths, cannot measure the effect that COS, CS2 and NH3 have on the total absorbance at a specific wavelength and attribute the absorbance to H2S and SO2.

The TLG-387 light source is either a pulsed xenon with extremely long life time or a very low noise deuterium source. The light is focused onto the tip of a fiber optic via collection optics and not direct couple for maximum light throughput. The TLG-387 uses fiber optics to transmit light to and from the detector allowing the electronics to be physically separated from the probe.

A patent pending demister probe - “cold finger probe” is used for in-situ measurements. The new design is simple and requires very low maintenance, benefiting from the availability of the state of the art detectors, fast computers and the innovative yet simple “cold-finger” probe, for instantaneous data analysis.

The detector is a high resolution UV/VIS diode array detector. The photodiode array has a broad spectral response and high sensitivity in the ultraviolet range. The low dark current and large charge saturation enables signals to be obtained with a high signal to noise ratio. The detector’s aperture match the fiber optics numerical aperture, hence, maximizing the light throughput. No moving parts, no moving sample.

The probe:
the probe is constructed from three concentric tubes. The outer one is 1.5" in diameter and is the outside diameter of the probe. The inner one is basically a “cold finger” that is designed to remove most of the sulfur vapor in a controlled manner. A tube leads to the bottom of the cold finger and brings air from the top of the probe to the bottom of the cold finger in order to cool it. The head of the probe contains an air driven aspirator that provides the motive force for the sample to travel through the probe past the cold finger where the sulfur is removed and into the integrated flow cell through the aspirator and out into the process through the waste tube.

Features of Applied Analytics TLG-387 on-line Tail Gas Analyser:

Diode array detection

  • Solid state no moving parts
  • Wide wavelength range
  • High resolution
  • Accurate concentration readings
  • No maintenance

Insitu detection cold finger demister probe

  • Fast response
  • no sample lines
  • Steam, nitrogen and sample gasses can be easily introduced into the probe

Fiber optics

  • Low Noise
  • Long life source

Absorbance spectra:
The TLG-837 measures a complete spectrum of the process and analyzes the data via a calibration method to give very accurate and reliable concentration readings. In addition standard gases can be introduced at any time to test the accuracy and reproducibility of the analyser. In the continuous operation the complete spectrum is displayed, allowing the operator to check the system and the validity of the actual reading, as oppose to filter based units where the operator has no access to the actual raw spectra only to the final numbers.

Sampling:
The tail gas stream, depending on the source, contains various amounts of sulfur. In order for the TLG-837 to be applicable to any condition a patent-pending demister probe was design. The measurements are being performed insitu while the sulfur is reduced significantly by this ‘cold-finger’ probe, no coating or plugging usually associated with sulfur streams are seen.

The probe is constructed from three concentric tubes. The outer one is 1.5" in diameter and is the outside diameter of the probe. The inner one is basically a “cold finger” that is designed to remove most of the sulfur vapor in a controlled manner. A tube is leading to the bottom of the cold finger and bringing air from the top of the probe to the bottom of the cold finger in order to cool it. The head of the probe contains an air driven aspirator that provides the motive force for the sample to travel through the probe past the cold finger where the sulfur is removed and into the integrated flow cell through the integrated aspirator and out into the process through the waste tube.


Specifications of Applied Analytics TLG-387 on-line Tail Gas Analyser:
Measurement method Diode array: 190-1100 nm

Components of Applied Analytics TLG-387 on-line Tail Gas Analyser:
H2S: 0-2%
SO2: 0-2%
COS: 0-2,000ppm
CS2: 0-2,000ppm

Accuracy of Applied Analytics TLG-387 on-line Tail Gas Analyser:
 ±1% of measurement on all components, (±5% below 500 ppm for COS and CS2)
±0.2% on air demand

Repeatability of Applied Analytics TLG-387 on-line Tail Gas Analyser:
±0.4% of measurement for H2S and SO2
±0.1% for air demand.

Zero drift Air demand
+/- 0.1 after 1-hour warm up, measured over 24 hours, every 5 seconds, constant ambient temp.

Response time 90% of final value in 10 sec.

Calibration Factory calibrated, verification and validation with standard gas samples and neutral density filters.
Outputs 4-20mA and RS232 for air demand, H2S, SO2, COS, CS2
and sulfur vapor.

For further information or to discuss your application requirements please visit our website or contact us using the email feature below.

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