Gas analyzers and monitoring systems for Compliance measurements - Monitoring and Testing - Air Monitoring and Testing
Several EU directives and national laws in European countries set requirements for continuous monitoring of flue gas emissions at power plants. The demand for emission measurements has only increased in recent years and the trend will undoubtedly continue. It is therefore increasingly important for power plants to have reliable information available on emission of air pollutants. A power plant’s license to operate can even depend on it. Because the reduction of emissions to desired levels requires significant investments, the implementation of reliable measurement systems becomes increasingly important.
Large industrial plants are required to have and maintain an efficient process of continuous emissions monitoring. In order to indicate that their processes are effective, and their emission monitoring systems meet the required criteria, there are carefully drafted EN Standards for assuring the high quality of permanently installed automated monitoring systems (AMS).
The relevant standard in this regard is EN 14181, the quality assurance of automated measuring systems. The standard dictates how to determine that the measurement systems installed for continuous emissions monitoring at a plant operate according to the directives and regulations set. To learn more, download our guide on Emissions Monitoring.
Two major parts of this on-going quality assurance cycle are the QAL2 and AST procedures. A test laboratory performs tests on the systems on-site and determines whether the systems fulfill the set requirements or not.
The requirements of QAL2 cover the calibration of the CEMS / AMS against nationally approved analytical methods applied by a test organization accredited to EN ISO/IEC 17025 (and MCERTS in the UK) by a national body. This stage of quality assurance specifies the procedures to ensure that the continuous emissions monitoring system has been correctly installed, calibrated by comparison measurement and independently verified.
Annual Surveillance Tests (AST) are very similar to QAL2 test but are carried out in a smaller scale. These mini-QAL2 tests are functional laboratory spot tests that map out the performance of a CEMS. Their purpose is to verify the continuing validity of the calibration function, and the requirements and responsibilities for carrying out the AST tests are the same as for QAL2. Read more about quality assurance of continuous emissions monitoring.
The ability to detect and measure almost any gas, combined with the robustness and reliability of the technology, makes Fourier Transform Infrared (FTIR) spectroscopy ideal for a wide variety of applications. FTIR instruments are widely used for stack emissions monitoring. The ability to record spectra over a wide wavelength range, and analyze these to identify a number of different pollutants in a stack gas makes FTIR a useful technique.
The Environment Agency (EA) which is a non-departmental public body, sponsored by the United Kingdom government’s Department for Environment has issued a Technical Guidance Note (TGN) M22 to provide guidance on the Environment Agency’s requirements when using manual extractive Fourier Transform Infrared (FTIR) spectroscopic instruments to measure emissions of pollutants from industrial stacks. The TGN provides a procedure and framework to ensure the quality control and quality assurance of measurements made using FTIR as an alternative to several European standard reference methods.
Gasmet manufactures robust and accurate, portable gas analyzers for a wide variety of applications. An FTIR analyzer works by simultaneously scanning entire infrared spectrum. Our Calcmet software then calculates the concentrations of each gas in the sample based on the characteristic absorption. All the gases in the sample can be measured simultaneously because the entire infrared spectrum is scanned at once. This allows for very quick multicomponent measurements and for compensation for any cross-interference.
The Gasmet DX4000 can be used when you need a portable gas analyzer solution instead of continuous gas monitoring. It is a portable FTIR gas analyzer for applications where multiple gas compounds need to be accurately monitored in hot & humid sample gas. Gasmet DX4000 is the world’s smallest FTIR emissions monitoring system. It has also received the coveted MCERTS certification for stack emissions monitoring.