Several Different Gaseous Emission Components
A modern production method of nitric acid may lead to a generation of several different gaseous emission components, such as nitrogen oxides (NOx), ammonia NH3 and nitrous oxide N2O. Nitrogen monoxide is an intermediate gaseous product in the manufacturing of nitric acid HNO3. NO is formed in a catalytic reaction between ammonia and molecular oxygen O2. But undesirable side reactions may result in a formation of nitrogen dioxide NO2 and nitrous oxide N2O.
Selective Catalytic Reduction
The NO and NO2 emissions can be reduced by use of Selective Catalytic Reduction unit (SCR), which deploys ammonia gas NH3 to limit emissions of NO and NO2. A modern nitric acid plant needs to monitor the emissions of these gases.
What you need to know about mercury emissions monitoring
Gasmet Technologies has published a new White Paper on the monitoring of mercury emissions to air from industrial processes. This paper focuses on summarizing the changes in measurement requirements and emission limits for Large Combustion Plants (LCPs), produced by The Commission’s Joint Research Center, and adopted by European Commission. After reading this White Paper you will learn what LCP BREF means in practice and how to prepare, who it concerns, the new continuous measurement requirements, and the new emission limits.
Case: Thetford Power Station
“The system has performed very well, with very little maintenance required. Zero point calibration with nitrogen (background) just takes a few minutes each day and is fully automated. Water vapour calibration is conducted at least once per year, but under normal circumstances no other calibration is necessary.” says Operations Team Leader Richard Bloomfield