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The ammonia (NH3) gas is injected to remove the NOx and thus reduce the NOx concentration in the stack flue gas.
With conventional NH3 analyzers that perform measurements indirectly, NH3 concentrations are obtained through a sampling system. Therefore, there are problems with the maintenance and running costs of the sampling system, and time delays in measurement. The TDLS8000 Laser Analyzer is the solution to all these problems.
Expected Benefits
The NH3 gas is injected to remove the NOx and thus reduce the NOx concentration in the stack flue gas, as well as to increase the dust collection efficiency of the dust collector (ESP) and prevent erosion. Excess NH3 injection increases the running cost and the residual NH3 amount, resulting in the generation of a foul odor. Therefore, the NH3 concentration in the stack flue gas is measured, controlled, and monitored.
Example of Boiler Flue Gas, NOx Removal Process (Oil and Gas Fuels)
As compared with conventional NH3 analyzers that perform measurements through a sampling system, the TDLS8000 is able to measure the NH3 concentrations in furnaces directly and thus reduce the maintenance and running costs.
Changes in NH3 Injection Volume and Measured Values (Installation Point A / Without NOx Removal Equipment)
The TDLS responds to NH3 injection volume changes at high speed and thus is able to control and monitor the optimum NH3 injection volume.
Measurement System
Utility
Notes
Yokogawa’s new TDLS™8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negate the need for sample extraction and conditioning.
Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications.
Tunable Diode Laser Spectrometer (TDLS) is a laser-based gas analyzer with fast-update optical analysis.
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