SpectraSensors SS2100 Water in Hydrogen Recycle Analyzer
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Part Number: 23101
Manufacturer Part No.: 23101
|Control H2 Recycle H2O concentration for optimum catalyst performance and for catalyst regeneration control.
Catalytic Reforming Unit: The Catalytic Reformer Unit of a modern refinery is an important process unit for converting lower octane naphtha streams into higher octane aromatic compounds. These chemical conversions are done in catalytic reactors that transform straight chain C6-C8 compounds found in the naphtha into light aromatics such as Benzene, Toluene and Xylenes (BTX). This high octane reformate can then be used in gasoline blending or sold to chemical plants. As shown in Figure 1, depentanized naphtha feed is mixed with recycled Hydrogen gas, preheated and passed through a series of reactors where the conversion to aromatics takes place.
After the last reactor, a Hydrogen Separator strips out the Hydrogen and other light gases from the stream. After the removal of the Hydrogen, the stream enters a Stabilizer Tower (also called a Debutanizer) that removes the Butanes and lighter gases with the Reformate leaving the Bottoms for gasoline blending or sent to a chemical plant.
Critical Control of Moisture: The catalyst in the reactors is very expensive and sensitive to poisoning if exposed to certain compounds; most notably H2O, if left unchecked, the moisture damages the catalyst, thus shortening its life and resulting in costly replacement fees. Proper operation of the Reformer needs reliable monitoring of
the moisture levels in the Hydrogen Recycle.
Traditional Measurement Solutions: Electrochemical moisture analyzers have been the traditional method for monitoring the levels of H2O in the Hydrogen Recycle stream. However, heavy hydrocarbons and trace HCl present in the stream contaminate electrochemical probes, which must then be replaced resulting in high maintenance costs. It’s not uncommon for moisture probes to be replaced multiple times a year.
SpectraSensors' Solution: SpectraSensors SS2100 is the ideal solution for this challenging application. Its non-contact sensor is impervious to damage from contaminants. The use of Tunable Diode Laser technology means that measurement interferences from other infrared absorbing compounds are avoided. And being laserbased means there are no wet-up or drydown delays, resulting in fast updates even when the concentration changes dramatically.
Dual Range/Dual Channel: Refineries normally operate at about 5 – 50ppm moisture level in the Hydrogen Recycle stream. During catalyst regeneration moisture can be much higher. A Dual SS2100, with two measurement cells calibrated for different ranges in a single sample enclosure is the answer to this requirement. The analyzer is supplied as a controller in a NEMA 4X enclosure with the cell and interconnecting cable supplied loose. SSI or a qualified systems integrator can supply a sample conditioning system suitable to the application.
- Avoids damage to sensor from HCl and other contaminants in the process - Tunable Diode Laser and Detector are isolated from the process Gas
- Virtually maintenance free - No routine maintenance requirements
- Fast – No wet-up or drydown times - Responds to changes in H2O concentration in as little as 1 sec.
- No interference from other compounds – uses high resolution TDL technology
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