Tunable-Diode Laser-based moisture sensors help ensure long catalyst life, reduce operational costs, and offer the lowers overall cost of ownership.
(PRWeb) February 21, 2007 -- Refineries and chemical plants have long been subjected - perhaps unwittingly - to high costs incurred from failure of conventional
moisture analyzer to accurately read moisture intrusion in feedstocks and hydrogen recycle streams, vital to optimizing product yield and catalyst life.
Because typical analyzers, such as those based on surface absorption or adsorption, employ sensors that are exposed directly to harsh elements in the streams they monitor, timely and accurate moisture readings may be disrupted within a relatively short period of time. The disruptive operational life leads to substantial costs that can range from exorbitant consumables and maintenance to conceivably hundreds of thousands of dollars for premature catalyst recharging or untimely interruption of continuous processes.
The innovative employment of tunable diode laser (TDL) technology has enabled the development of a new moisture technology - the laser-based spectroscopy
moisture analyzer. Developed as a spin-off of NASA-JPL space technology by SpectraSensors, Inc. (San Dimas, CA), this advanced optical device continuously samples reformer streams without coming into contact with them, thereby avoiding destructive contents such as hydrochloric acid, which can quickly damage ("poison") a surface-absorption based sensor. Moreover, the surface based sensors may not be entirely disabled, or it may drift for a number of reasons and may continue to transmit inaccurate moisture readings until catalyst life has been compromised.
The TDL-based sensor can provide refineries and chemical processors with a high ROI based on avoidance of tangible costs, such as consumables, as well as extremely high intangible costs, such as catalyst recharging and process interruptions.
Tangible costs are greatly reduced through the use of the TDL-based moisture analyzer. While initial purchase price is somewhat higher, the reduced operating costs of this technology are likely to overcome this initial investment quickly. These devices can run for years without requiring maintenance, recalibration or replacement. Therefore, costs such as analyzer technicians, repair or replacement of probes, as well as an inventory of spare sensor heads are eliminated.
During turnovers or other abnormal process events, moisture slugs can render conventional moisture sensors "blind" for hours or days. For this reason, refineries have resorted to building in redundant analyzers and the associated sample handling conditioning and stream switching. This can double or triple the installed costs!
Speed and reliable measurements characterize TDL-based moisture analyzers such as those offered by SpectraSensors are about to detect moisture problems with extremely high accuracy and measurement intervals as frequent as within a second, enabling practically instantaneous response, eliminating the chance that moisture will get through "reading time gaps" that are often several minutes or hours in duration with conventional sensors.
The costs associated with unreliable moisture measurements can easily be
derived by examining operational costs over the life of a
moisture analyzer. These include probe replacement, technician labor and overhead associated with maintenance and downtime. The costs associated with redundant systems are equally straightforward to compute. Additionally, the intangible costs of analyzer failure can be examined. Although the probability of events such as catalyst failure or reduced efficiency or contaminated production may be low, the costs of these events are extremely high. For these reasons, the value of a reliable and fast measurement point goes far beyond the initial purchase prince.
By Charles Smith, PhD
For More Information Contact: Sam Miller at SpectraSensors; Tel: (800) 619-2861 x4106; SpectraSensors, Inc.; 11027 Arrow Rte., Rancho Cucamonga, CA 91730-4866
http://www.spectrasensors.com
Press Contact: Sam Miller
Company Name: SpectraSensors
Email: email protected from spam bots
Phone: 800 619-2861
Website: http://www.spectrasensors.com
Press Release Source: EMediaWire
