Abstract Submission - Dr. Michael Boness - SICK MAIHAK
MCS100 FT - EN 15267 Certified Continuous Emission Monitoring System
The concept for this new CEMS includes individually developed components for gas extraction, measuring cell, ejector pump unit and data evaluation. A main objective of the development was to realise the smallest possible measuring range for the detection of HF (hydrofluoric acid) as requested in the European legislation EN 2000/76. Beside this, all requested standard stack gas components like HCl, CO, NO, NO2, SO2, together with H2O and CO2 and others are simultaneously measured in the multi component FTIR analyser MCS100FT. The entire system was approved according to the new legislation standard EN15267 and will cover approval requirements for TÜV as well as for MCERTS. This new standard considers not only the analyser but the entire approved measuring system from gas extraction to the data evaluation by chemometric models.
The interferometer unit uses the permanently aligned Cube Corner configuration well known in the process market as a rugged, reliable and stable interferometer. It is successfully used for many process applications in the chemical, pharmaceutical, polymer and petrochemical industries.
The measuring cell of this monitoring system has been developed by SICK MAIHAK GmbH based on more than 20 years of experience in the stack gas monitoring market. The challenge for this new designed cell was the use of corrosion resistant material in order to withstand typical stack gas conditions and on the other side to achieve requested short response time und detection limits by avoiding wall interactions for the well known reactivity of HCl, HF, NH3, and water molecules.
To ensure a stable gas flow from the stack sampling point in a nearly maintenance-free way a new sampling system based on ejector pump principle has been developed. The needed high sample throughput (up to 400 l/h) has been realised as well as a minimised consumption of instrument air, reducing the operating costs for the instrument. The sampling probe offers the well known functions of automatic zero gas feeding, back purging, and a blow back function for filter cleaning purposes. The system provides an independent temperature control for all heated parts to avoid any stack gas condensation inside of the system. The chemometric modelling employed in the device is a new development which minimises interferences between gas components and ensures the easy calibration data transfer between different MCS100 FT instruments. To guarantee drift-free operation, potential wavelength drifts of the instrument are controlled by a special tracking algorithm. For state of the art communication the new data evaluation unit SCU (System Control Unit) developed by SICK MAIHAK is used for the instrument. This unit is adapted to the needs of the emission monitoring and process market and provides standard communication ports like internal CAN-Bus and field bus systems like ModBus or ProfiBus. An ethernet port for remote control of the entire unit will ensure data communication via internal and external TCP/IP networks. Using these possibilities remote maintenance by internet access will become true. TÜV approval was completed in second quarter of 2008. First installations in Germany with good experience have been started. All requirements with requested performance for QAL-1, QAL-2 and QAL-3 as described in EN 14181 are provided. The actual maintenance interval is given with 3 months. An extension of the maintenance interval up to 6 months is in progress.
