Monitoring of SO2 for Flue Gas Desulfurization

Flue gas desulfurization system purifies exhaust gases emitted from thermal power plants, iron and steel plants, and others by removing sulfur dioxide (SO2). Types of flue gas desulfurization system include the wet and dry types; today, the wet type is often used. The SO2 concentration is measured at its inlet and outlet to monitor the performance. Such exhaust gases contain much moisture and the gas temperatures are low from the system, which raises concerns about moisture interference and corrosion for the SO2 monitoring.


  • Unstable measurement due to moisture interference
  • The sampling system comprised of probes and the system main body becomes corroded by acids due to the high moisture concentration level and low temperatures of exhaust gases.

HORIBA's Stack Gas Monitoring System realizes More Stable Measurement

HORIBA's stack gas monitoring system achieves more stable measurement than conventional systems due to the adoption of a unique cross-flow modulation technique and an interference correction type detector. We also contribute to solving customers' issue by pursuing better maintainability under difficult measurement conditions by proposing sampling systems according to exhaust gas conditions such as changing the probe material and adding an SO3 scrubber.


  • Unique measurement method (cross-flow modulation technique, interference correction detector)
  • Proposal of sampling system suitable for severe conditions
  • Adoption of a moisture removal system (three-stage dehumidification) that reduces SO2 solubility
  • Simultaneous measurement of oxygen (O2); stable measurement is possible even in high moisture conditions thanks to a unique techniqu (magneto-pneumatic system).

Case Study

SO2 Monitoring of Stack Gas Desulfurization Facility Entrance

SO2 Monitoring of Stack Gas Desulfurization Facility Entrance

Related Industries

Thermal Power Generation

Solutions that can contribute to all power generation processes, from combustion to waste gas treatment

Iron and Steel Production

Analyzers and applications that contribute to all manufacturing processes, from blast furnaces to rolling

Related Brochures

Related Products

ENDA-5000 series
ENDA-5000 series

Stack Gas Analysis System

PG-300 series
PG-300 series

Portable Gas Analyzer

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