Operating a fossil fuel power plant or combustion process presents many challenges.
Many of these processes have varied fuels with varying sulfur content. It is well-known and documented that the presence of sulfur-bearing compounds in refinery fuel gas heaters, power generation boilers and other combustion processes can lead to the formation of SO3 and, subsequently, sulfuric acid.
Additionally, the operation of Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) NOX control technologies introduces ammonia into the process and furthers the conversion of SO2 to SO3. This can lead to the formation of more severe sulfur condensables, like ammonium bisulfate (AbS), resulting in downstream Air Pre-Heater (APH) Fouling, cold end corrosion and visible emissions (“Blue Plume,” “Acid Mist,” etc.).
In order to control the effects of the formation of these condensables and mitigate their consequences, it is imperative that plant operators be able to predict or measure the severity and species of the flue gas condensables, and, thereby, operate at optimum efficiency and protect the downstream process equipment. Unfortunately, “The calculation of Flue Gas Acid Dew Point [FGADP ] temperatures is a multivariable reaction equilibrium problem that is neither elementary nor precise,” [API 560]. Therefore, the plant is forced to operate under less-efficient conditions to protect from the balance of plant effects described above.
The Breen Acid Gas Product line includes on-line instruments specifically designed to measure the ammonium bisulfate, sulfuric acid and other flue gas condensables, formation temperatures, evaporation temperatures and dew point temperatures.