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Measurement of NH3 Concentrations in Stack Flue Gas Using TDLS200

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Introduction

The ammonia (NH3) gas is injected to remove the NOx and thus reduce the NOX concentration in the stack flue gas.

Example of NOx Removal Process

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 TDLS200 Laser Analyzer is the solution to all these problems.

Expected Benefits

  • Eliminates the need for sampling and reduces the maintenance and running costs of the sampling system
  • High-speed response, possible to apply measurement results to control the NH3 injection volume, and reduction and optimization of the NH3 injection volume
  • Continuous monitoring, NH3 emission volume monitoring, and environmentally friendly
  • Extends the service life of NOx removal equipment and reduces the ammonium sulfate precipitation of the air heater

Process Overview

View of an installed TDLS200 (Point A)
View of an installed TDLS200 (Point A)

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. 

  • Installed on the outer wall of the stack at a height of 45 meters (Light emitter)
  • Light path length: 4.3 meters
  • Temperature correction: 0 to 200°C

 


 

  

Solution Details

As compared with conventional NH3 analyzers that perform measurements through a sampling system, the TDLS200 is able to measure the NH3 concentrations in furnaces directly and thus reduce the maintenance and running costs.

Field Data

Changes in NH3 Injection Volume and Measured Values (Installation Point A / Without NOx Removal Equipment)

Changes in NH3 Injection Volume and Measured Values

The TDLS200 responds to NH3 injection volume changes at high speed and thus is able to control and monitor the optimum NH3 injection volume.

The TDLS200 responds to NH3 injection volume

Measurement System

TDLS (NH3 analyzer)
TDLS200-G-A1-2-N/
Alignment flange
P/N K9745CA (ANSI Class 150 2-inch, 316SS)

Notes

  • Power supply: 100 - 240 VAC, 50/60 Hz
  • Purge gas: Instrumentation air or N2 (depending on the application type and required measurement accuracy Flowrate: 5 L/min to 50 L/min
  • Dust concentration (standard): 15 g/Nm3 or less

Industries

Related Products & Solutions

In-Situ Gas Analyzer TDLS200

The TDLS200 is designed to make fast, accurate measurements of gases including oxygen (O2), carbon monoxide (CO), methane (CH4), moisture (H2O), carbon dioxide (CO2), ammonia (NH3), and hydrogen chloride (HCl). It is ideally suited for environments involving changing pressure or temperature.

In-Situ Gas Analyzer TDLS8000

Yokogawa’s new TDLS8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negates the need for sample extraction and conditioning.

Oxygen Analyzers

Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications.

Tunable Diode Laser Spectrometers

Tunable Diode Laser Spectrometers (TDLS) are laser-based gas analyzers which provide a fast-update optical analysis.

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