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SS2100 Hydrogen Sulfide In Refinery Flare Gas
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Part Number: 23302
Manufacturer: SpectraSensors
Manufacturer Part No.: 23302
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Just like with heaters, boilers, and furnaces, plants must regulate the amount of H2S in the flare gas in order to comply with mandates from the Clean Air Act Amendments (CAAA) of 1990. The SpectraSensors SS2100 H2S Analyzer is a new, low cost, low maintenance analytical solution that generates extremely reliable measurement of H2S in the flare gas stream.
H2S in Refinery Flare Gas: Refinery flares present a special challenge in measuring H2S due the variability of the background stream composition. See Table 1 for a typical composition of refinery fuel gas. Nearly all analytical technologies are sensitive to rapid changes in background composition to some extent. Fortunately, the regulations recognize this fact and have an exception for upsets and leaks through relief valves. Specifically, 40 CFR Part 60, Subpart J, paragraph 60.104 (a) (1) states: “The combustion in a flare of process upset gases or fuel gas that is released to the flare as a result of relief valve leakage or other emergency malfunctions is exempt from this paragraph. So an important part of specifying and designing an analyzer for H2S in Flare Gas is to define the “normal” gas. To prevent in the ingress of atmospheric air into the flare header, a purge or sweep gas is used. This may be refinery fuel gas, natural gas or some other light gas that is inert and non-corrosive. The design basis of the analyzer should be this purge gas composition.
Online H2S Analyzers: Many refinery sites have installed on-line gas chromatography (GC) systems for this measurement. In addition to their initial cost, GC’s have high consumable costs for carrier gas, columns and other parts. Additionally, they require frequent maintenance, especially those utilizing a flame photometric detector (FPD). Lead-Acetate tape systems can be used, which are expensive, use consumables, and require constant maintenance. Additionally, the spent tape is considered hazardous waste and is expensive to dispose.
SpectraSensors' Solution: Only SpectraSensors employs Differential TDL spectroscopy to get accurate measurements in the changing background gas composition of flare gases. The sample is scrubbed using a proprietary Copper nanoparticle absorbent that removes only H2S, and the background spectrum is acquired. Then the spectrum of the raw, un-scrubbed sample is acquired and the background spectrum is subtracted, leaving only the laser light absorbance due to H2S. The same background spectrum can be used until the background gas changes which is detected automatically by the smart controller logic looking at the background spectrum. Since the scrubber is only used intermittently, its lifetime is typically a minimum of 18 months. Software calculates the loading of H2S on the scrubber and gives a warning when it is time to replace the scrubber, and an indicating scrubber downstream warns if the scrubber fails prematurely. The scrubber is easily replaced in a few minutes; the spent scrubber contains no hazardous materials and can be exchanged at a reduced price for a new scrubber. The laser and detector are isolated from the sample and protected against corrosive gases. The analyzer is extremely fast (typically 16 sec/measurement) and the results are highly reliable. Requiring no consumable gases or lead acetate tapes, the cost of ownership is extremely low.
Key Features:
- No Consumable Gases or Lead Acetate Tapes - Low Cost of Ownership
- No ongoing recalibration - Low maintenance
- Electronics Isolated From the Process Gas – Rugged, Simple design, trouble free operation
- Optical Tunable Diode Laser Technology - Repeatable, fast measurements
- Meets EPA Requirements for 40CFR60 Subpart J
- Automated 2 –Point daily Validation Included
For More Information, Please Call 866-451-2257 or 805-576-7625. |
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