ANALISADOR DE ENXOFRE TOTAL TSA-100
Consumable-free total sulfur analysis for gaseous hydrocarbon streams.
Sulfur compounds-particularly H2S-in natural gas carry with them a host of problems and considerations for both producer and consumer. Sulfur content is known to:
- Cause pipeline corrosion, jeopardizing distribution networks and necessitating complex maintenance regimens
- Officially reduce the quality of sales gas
- natural gas quality assurance involves monitoring of sulfur content, e.g. at custody transfer points
- Contribute directly to SO2 emissions from gas-burning plants
- SO2 is a widely regulated pollutant and a necessary concern for avoiding fines and fulfilling social responsibility
- Introduce unpleasant odors to gas-dependent industrial and domestic environments
- mercaptans are added to natural gas to make leaks noticeable by smell, but uncontrolled sulfur content turns the odor from useful to intolerable
Avoiding these chronic sulfur-related issues requires reliable online monitoring of total sulfur load in gaseous hydrocarbon streams. The only way to verify the efficiency of sulfur removal processes and ensure satisfaction of customer and environmental needs is to proactively analyze stream composition.
One industrially common method of measuring sulfur compounds in gas is based on lead acetate tape, on which H2S forms color spots of lead sulfide precipitate. The rate of color change (darkening) is scanned optically by tape-based analyzers and used to describe H2S concentration. Since tape saturation occurs at very low H2S concentrations, users of these systems have to administer convoluted, variable sample dilution ratios.
The lead acetate method functions on a model of continual tape replacement, effectively passing the financial burden from upfront equipment cost to chronic expenditures in the forms of consumable subscriptions and labor-intensive operation. Just as light can destroy film reels, any H2S leak will scrap an entire tape reel. Furthermore, since lead acetate is carcinogenic and a cause of fetal mortality, the saturated tape must be returned to the vendor for disposal.
The TSA-100G is a fully integrated monitoring solution driven by advanced UV spectroscopy. The system includes two mass flow controllers-one for pulling in a continuous stream sample and the other for injecting oxygen-and a pyrolyzer for combusting this mixture. In the process, all incident sulfur compounds are oxidized to SO2.
NOTE: the TSA-100G is designed for gaseous hydrocarbon streams with complex and possibly unknown composition, including exotic sulfur compounds. If the only significant sulfur compounds in your process are H2S, SO2, COS, and/or mercaptans, consider the OMA-300 Total Sulfur Direct for direct multi-component analysis-no combustion necessary.
The diode array spectrometer inside the TSA-100G uses 1,024 discrete photodiodes to produce high-res spectra of SO2absorbance. Monitoring a full spectrum allows for high wavelength range selectivity based on analyte concentration. For example, while a region of relatively high absorptivity might be best for low ppm SO2 concentrations, a moderate-absorptivity range will better suit higher concentrations (an optimization based entirely on light levels). This spectral flexibility translates to excellent dynamic range; with the TSA-100G, the end user experiences seamless measurement accuracy, from low ppm SO2all the way up to high % levels.
The TSA-100G is an automated total sulfur analyzer. AAI engineers believe that automation entails turn-key installation and uninterrupted performance-no consumables, no dilutions, no labor. The solid state design of this system translates to more uptime and less room for human error.
Applications for the TSA-100G are commonly found in:
natural gas processing and refining
pipeline corrosion prevention
quality assurance (e.g. custody transfer points)
monitoring of petrochemical feedstock
emission monitoring and environmental compliance
|Specifications for the TSA-100G are currently being revised by R&D.
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