Raw gases are untreated flue gases that have not passed through an emissions control technology system like selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR). They are generally measured for the sakes of process control and warranty tracking. Typically only a few components are measured but Fourier transform infrared spectroscopy FTIR technology allows the measurement of all components. Read about our solutions for raw gas measurements!
Ammonia Slip Emissions
Selective catalytic reduction (SCR) is the process of nitrogen oxides (NOx) reduction or DeNOx, that occurs when a NOx source is mixed with ammonia and allowed to react at the surface of a catalyst. This process is used to reduce NOx levels to those required by local environmental legislation. The result is converted to nitrogen gas N2 and water vapor H2O, both harmless constituents of the atmosphere.
Ammonia slip refers to emissions of unreacted ammonia passing through the SCR. This occurs when ammonia is over-injected into the gas stream, temperatures are too low for ammonia to react, or catalyst has degraded. Power plants and waste-to-energy plants try to control ammonia slips with a DeNOx process control. In effect, this means the supervision of the SCR catalyst and the measurement of ammonia from the smokestack.
Ammonia slips are expensive to plants not to mention the environmental problem created by ammonia emissions. To learn more, download our free Emissions Monitoring Handbook.
Process Measurements – Real-time and Accurate Process Data
Process measurements are a standard tool in following different process variables and gaining important knowledge about your process. In this method, gases are measured before gas washing. With real-time and accurate process data, understanding your process in detail becomes easier and quality of process control increases.
There are often multiple measurement points where the raw gas composition is sought. Measuring for example hydrochloric acid (HCl) and sulfur dioxide SO2 is important to better understand the process. These gases are measured also to estimate the risk of corrosion.
Gasmet offers gas analyzers and system solutions to make the following and controlling your process easier.
Our Solutions: Continuous Monitoring System and Portable Gas Analyzer
Gasmet manufactures portable FTIR gas analyzers and stationary FTIR emissions monitoring systems. An FTIR analyzer works by simultaneously scanning the 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 Continuous Emissions Monitoring System CEMS II e can be used on the process side to monitor the untreated raw gases, as well as to monitor the flue gas emissions at the stack. It offers TÜV and MCERTS certified solution (QAL1) for a wide range of demanding emission monitoring applications. The CEMS II e system utilizes Fourier Transform Infrared Spectroscopy FTIR technology.
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
Case: Thetford Power Station
“We originally purchased the portable Gasmet DX4000 analysers as a an emergency back-up unit, but the core measurement components of a DX4000 are exactly the same as the Gasmet CEMS, so it made sense to run both analysers simultaneously so that we always had a ‘hot’ back-up.” says EPR Group Environmental Manager Kevin Williams