CEM 2020

CEM 2018 - Abstract

Abstract Title: Emissions Reduction Using Combustion and Post Combustion Analyzer Control Strategies
Abstract Type: Seminar
Session Choice: Emission regulation and future monitoring challenges
Presenter Name: Dr Barbara Marshik
Company/Organisation: Servomex
Country: United States

Abstract Information :

Most industrial plants that use boilers for heating or power have seen significant pay back on fuel costs when they tune and control the fuel combustion process. However, for those facilities that must maintain low permitted emissions limits, tuning and controlling the combustion process can play an enormous part in reducing and controlling PM, NOx and CO emissions. The most effective NOx control strategies are Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR), both based upon the use of ammonia (NH3) or urea to suppress NOx formation. Too much NH3 dosing (NH3 slip) and ammonium bisulfate (ABS) forms - eventually plugging the NOx catalyst or corroding the boiler and other downstream equipment. By monitoring the NH3 concentration the dosing (NH3 or Urea) of the SCR / SNCR can be controlled resulting in low levels of NOx emissions and for those power plants selling the ash, a higher valued product. Further NOx and CO emissions improvement can be made by controlling the combustion process as well using optimization that focuses on reducing CO and NOx emissions rather than on fuel consumption. This presentation will focus on the challenges analyzers are faced with and how they can be overcome, when used to control the formation of NOx and CO emissions, requiring fast, accurate gaseous component signals in an environment of high dust / particulates (coal or biomass) or sheer forces (turbines).