Stack gas flow measurement without moving parts
A
Torbar Flowmeters product story
Edited by the Engineeringtalk editorial team
Mar 25, 2002
Torbar has introduced the SG3000 gas flow system to measure the mass flow of exhaust from chimneys and stacks up to 10m in diameter.
Torbar has introduced the SG3000 gas flow system to measure the mass flow of exhaust from chimneys and stacks up to 10m in diameter to help operators ensure that pollution levels are maintained within prescribed limits.
At the heart of the system is Torbar's averaging pitot sensor that can be supplied up to 10m long to provide measurement across the full diameter of the stack and has integral pressure and temperature sensors in its single insertion.
The System provides a timed power purge to clean contaminants from the sensing holes.
Flow measurement of hot, corrosive and frequently abrasive media from chimneys is not easy since devices can become contaminated or corroded, and any sensor that does not cover the full diameter of the stack gives misleading results.
The Torbar averaging pitot tube is a primary flow element with no moving parts and, because of its one-piece outer tube manufactured from exotic metals or 316 stainless steel, it is very strong.
Profile flats ensure consistency of coefficient for flow rates over a range of 10 to 1, and a secondary internal averaging tube provides true averaging of irregular velocity profiles typically found in stacks.
The sensor and associated instrumentation can withstand temperatures up to 1200C, up to 16bar absolute pressure within the stack, at gas velocities up to 50m/s.
An auto zero is incorporated to maintain the system accuracy of +/-3%, the output being frozen while purging is in operation.
The frequency and length of the purge cycle is user programmable, and alarms include 'low air purge' and 'system fault'.
The transmitters, programmable logic controller, and flow compensation equipment are supplied in one cabinet where access is not a problem or in two, with the transmitter cabinet local to the sensor and the control cabinet up to 250m from the sensor.
The system includes high quality air filter/regulator and solenoid valves and is CE marked.
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