Infrared Sensor keeps petrochemical flares smokeless.
July 31, 2012 -
As part of petrochemical plant's closed-loop control system, FM Flare Monitor prevents smoke before it is produced, and is unaffected by introduction of steam. When signal indicates that oxygen is becoming relatively scarce, control scheme adds oxygen to flame before signal reaches critical setpoint at which soot would form. Equipped with through-the-lens sighting and narrowband IR filters, sensor features optimal working distance of 1,200 ft with max distance of 1,800 ft.
Original Press release
Williamson Corp.
70 Domino Dr.
Concord, MA, 01742 2893
USA
Infrared Sensor Keeps Petrochemical Flares Smokeless
CONCORD, MA - The new Model FM Flare Monitor for Smokeless Flares from Williamson Corporation, as part of a petrochemical plant's closed-loop control system, efficiently prevents smoke before it is produced, rather than reacting to smoke as most competing sensors do. It is also the only optical product of its type that is unaffected by the introduction of steam.
Unlike any other sensor, the Model FM Flare Monitor senses the conditions precursory to soot formation, not soot particulates. It monitors the ratio of carbon to oxygen within the flame, and its continuous output signal is proportional to that ratio and therefore proportional to the tendency of the flame to smoke. When the signal indicates that oxygen is becoming relatively scarce, a successful control scheme adds oxygen to the flame before the signal reaches the critical setpoint at which soot would form.
Thanks to its special narrow-band infrared filters, the Model FM's output is reliable even through dirty optics, fog, rain, and snow, within limits. The output signal typically goes to a proportional-integral-derivative (PID) control system that activates a control valve to modulate the amount of added air or steam as needed, ensuring that there is always ample oxygen for the combustion to be complete, all without the need for operator intervention. For facilities that use steam, another benefit of such precision is that no steam is wasted.
The Model FM comes standard with through-the-lens sighting and an adjustable swivel bracket that facilitates installation and alignment. The sensor's dual-wavelength technology ensures a large target area, further facilitating alignment. The unit, which is available with a standard (NEMA4/IP65) or rugged (NEMA7/ATEX/IECEx IIB+H2) housing, can be mounted at ground level, optimal working distance within 1200 feet (365 meters) with a maximum distance of 1800 feet (550 meters). The strength of the measured signal decreases with the square of the distance. Optical resolution is D/17 (60 feet at 1,000 feet).
The Model FM Flare Monitor is a complement to Williamson's proven Model PM Pilot Monitor, which is used to confirm the presence of a stack's pilot flame. Approximately a thousand units of this other model have been in use worldwide, over many years.
Williamson Corporation manufactures a complete line of noncontact temperature measurement and control systems for steel, aluminum, glass, and petrochemical applications. All Williamson products are designed for high accuracy and long life, even in hostile environments. For more information, contact William Barron Jr., President, Williamson Corporation, 70 Domino Drive, Concord, MA 01742, U.S.A.
TEL: +1 978 369 9607, FAX: +1 978 369-5485, Email: sales@williamsonir.com.
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