Ammonium bisulfate formation and reduced load SCR operation

With the increase in renewable fuel sources and the increasing use of natural gas for electricity generation, coal fired boilers are called upon to operate over a broader load range. Using the above expression, this work shows that the generally accepted value for ABS formation temperature is nominally 5% (14 K or 25°F) too high. While this difference may seem small, from a practical perspective it can represent substantial operating cost savings, as a large coal fired plant can operate at a lower minimum load than is currently required by the catalyst vendor's prescribed SCR minimum operating temperature based on ABS formation temperature from prior work.