Gas Analysers

Most large coal fired power plants and combustion processes are required to monitor CO, NO and NO2 (NOx), SO2 and possibly CO2; in addition the analyser has to be normalised to Standard conditions. For this application CODEL offers the five channel GCEM 40 series which uses Infrared absorption to measure these gases plus moisture, pressure and temperature.  The analyser can be configured for single channel operation to monitor any of these gases plus CH4 and HCl.

Where more channels are required, CODEL offers the GCEM 4000 which can measure seven gases from CO, CO2, NO, NO2, SO2, HCL, CH4, H2O. It uses the same non-dispersive infra-red technology as the GCEM 40 series and is used often where there are very high dust loadings.

The extractive  GCEM 40E is used primarily on gas fired power stations where smaller stacks are found; it can monitor the same gases as the GCEM 40 series with the addition of an optional Oxygen sensor for normalisation purposes. Its key advantage over competitors is its simplified sampling system that does not require NOx converters or a chiller. An additional option is an integrated touch screen monitor that runs the SmartCEM data acquisition software.

The GCEM 4100 has the added ability to monitor up to seven gases (the same gases as the GCEM 4000) simultaneously.

Dust monitors

For large combustion plants and power plants we offer the DCEM 2100 particulate monitor. This monitor is certified to EN 15267 part 3 QAL 1 for all industrial processes including waste incineration. It offers outputs in Transmission, Opacity and mg/m3 (when calibrated against a Standard Reference Method). The DCEM 2100 offers real-time zero and span calibration and an efficient air purge system to prevent optical contamination.

The DCEM 2100 also has a valve system to prevent stack contaminants damaging the optical surfaces should the air purge fail. Finally, the analyser has a misalignment check that warns when misalignment drift sets in.

Where the plant has auxiliary bag houses, the StakGard Tribo-electric leaking bag detector will detect excessive emissions and give an alarm output.

There is a particular problem of CO build up on Electrostatic precipitators (ESP) which can lead to an explosion in the ESP. The CODEL Model 1010 can monitor CO levels in ESP’s and give an alarm when levels reach a critical point.

Flow monitoring

Many large combustion plants are now required to monitor mass emissions of major pollutants and to do so requires an accurate measurement of stack gas velocity. The VCEM 5100 is certified to EN 15267 part 3 QAL 1 for all industrial processes including waste incineration. It has several key advantages, firstly the sensors optics are not in contact with the hot and dusty environment, the VCEM 5100 can monitor gases at temperatures exceeding 10000C and the analyser requires minimal maintenance. The VCEM 5100 can be used in extremely dust environments such as SCR’s when dust loadings exceed 10g/m3. The VCEM 5100 is in full compliance with EN/ISO 16911 part 2.

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