OPERATION & MAINTENANCE OF POWER PLANTS
DEPENDABLE GAS FLOW MEASUREMENT SOLUTION to control vaporised NH3
(NH3 T he engineering team at a
coal-fired electric power plant utilising ammonia
) for nitrous oxide
(NOx) removal by its pollution control system installed the ST100 series
thermal flow meter
from Fluid Components International (FCI) based
on its superior repeatability in measuring NH3 under harsh operating conditions.
The flow meter allowed the
plant team to optimise its selective catalytic reduction (SCR) system. This step improved performance
while substantially reducing NH3 consumption and costs. The meter,
with its rugged thermal dispersion sensor head, provides a highly repeatable measurement solution
applications.
The engineers at the electric power plant were experiencing problems with inconsistent measurement of the vaporised NH3
injected
into their flue gas as a means to reduce NOx
emissions. The original system
used a volumetric flow sensor, which wasn’t well suited for controlling the NH3 gas injection system. Switching to the mass flow sensing ST100 series meter, as opposed to taking a volumetric measurement, solved the false readings issue.
Given the instrument’s standard wide flow turndown ratio of 100:1 (up to 1,000:1 based on application), and the ability to measure mass flow, instead of volumetric flow, the
in such
engineers decided to conduct a pilot test. They installed the insertion style ST100A thermal flow meters on the primary vaporised ammonia feed lines to their nozzle grid for the test. With the resulting improved
measurement reliability, they took the project further and installed in-line style ST100AL thermal flow meters at each of the nozzle locations. After proving out the benefits in one operating unit, they eventually instrumented the ammonia injection systems for all of the units within the facility. The ST100 meter can be factory
calibrated to measure virtually any popular process gas as well as mixed gases. It is suitable for use in wet and dirty gas applications, having no small ports prone to fouling. ●
For more information visit
www.fluidcomponents.com
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