22 Jun 2023
Air flow measurement and gas analysis for Oxidizers/Burners
Air flow measurement and gas analysis for Oxidizers/Burners
Challenges
- Too rich or too lean combustion
- Poor NH3 control in Selective Catalytic Reduction systems
- High maintenance from extractive analyzers
- Measurement inaccuracies due to condensation and clogging
- Environments that are ATEX and SIL rated
Requirements
- Measuring the direct mass air flow rate of combustion air/exhaust gases
- Continuous Emissions Monitoring Systems – CEMS requires regular drift checking of the flow meter electronics
- Measure O2, CO and CH4, giving a real-time response
- Equipment able to handle high temperature
- Large pipe/duct/stack
- Equipment works well in wet gas and does not clog due to particles
Drift Checking
FCI’s MT100 CEMS and AMS/QAL1 options provide automatic and on demand checks for both interference and calibration drift. The system check will check for sensor for potential contamination or blockage and will perform calibration checks at low and high range/span points.
The CEMS/AMS check can be initiated on demand via the display’s “SYS CHK“ button and user set to run automatically at any desired time of day. The test results will be displayed with easily understood “pass” or “fail” message and “green” or “red” lamp symbol, respectively. In the event of a fail, the user can interrogate the instrument through the diagnostics menu to see the specific item failure and actual tested values.
NEO Monitors LaserGas™ III gas analyzer is factory calibrated with no zero drift.
Hazardous Environment
All of the equipment indicated here are SIL rated and have ATEX/IECEx approval for hazardous areas.
High temperatures
FCI’s ST80, ST100 and MT100 series models come available with high temperature heads that can handle up to 454°C.
NEO Monitors LaserGas™ III gas analyzer supports in-situ measurement (quick response) up to a process temperature of 1300°C.
Large pipes/ducts/stacks
FCI’s ST102AA model and MT100M/MT100S models are capable of measuring air/gas flow rates in large pipes/ducts/stacks. This is done by having more than one point of measurement inside the line, giving us information about the flow profile which allows us to give readings with better accuracy.
NEO Monitors LaserGas™ III is capable of analyzing stacks larger than 2m in diameter.
Wet gas
FCI developed a wet gas sensor head specifically for the purpose of handling air/gas flow with a high amount of mist. While it is not recommended for steam, this sensor head is capable of handling applications with some amounts of water.
NEO Monitors LaserGas™ III gas analyzer uses a proprietary IROSS™ signal processing and is able to obtain high measurement precision even in complex gas mixtures. It can dynamically compensate for NH3 measurements regardless of moisture content.