Process control of a SO2 scrubber on a ship is a challenge due to wet and corrosive gases. In such environment, extractive gas sampling systems require high levels of maintenance in order to operate correctly. OPSIS monitoring system solves this by using an optical, non-contact, cross-duct technique. A light beam is sent across the duct or stack to be measured, and the captured light is sent through an optical fibre cable to an analyser. The analyser measures SO2, CO2 and NOx concentrations using UV and IR...
Detecting CO2 impurities: Ammonia, Acetaldehyde, Benzene, Total Sulfur Content, Total Hydrocarbons, SO2, COS. Carbon dioxide (CO2) is a commonly used additive in food and beverage industry (e.g. for soft drink, brewery, and champagne carbonation). Its fabrication process can lead to the presence of impurities such as aromatics, BTEX, ammonia, acetaldehyde, Total Hydrocarbons and sulfur compounds (Total Sulfur Content, SO2, COS, mercaptans...).
Determining levels of CO and CO2 and their respective ratio in the oxychlorination reactor contributes to overall process efficiency. The on-line analyzer system uses a selective CO/CO2 measurement by means of multi-wavelength infrared with automatic optical span possibility.
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.
The process control of a CO2 capture plant needs good and reliable detection of gas phase NH3 and CO2. Measuring NH3 is a challenge due to the corrosive environment and high concentrations of NH3. Several places in the process needs to be monitored and to transport the sample is difficult. A large dynamic range is needed as the NH3 concentration can vary between 15% volume and a few mg/m3.
CO (carbon monoxide) and CO2 (carbon dioxide) are generally measured to ensure process control. CO2 is the desired product and CO is undesired in combustion since it will explode in high enough concentrations. CO2 and CO concentrations can also be used to determine other process-specific efficiencies. Continuous emissions monitoring equipment that can be calibrated as a CO and CO2 analyzer is thereby essential for process control.