This paper will take a brief look back at the history of SO3/H2SO4 concerns, from the “pseudo” particulate issues of the 1970s, current mitigation techniques, a review and comparison of extractive SO3 test methodology and the current need for real-time SO3 monitoring. The concern over SO3/H2SO4 formation in back-end coal fired boiler emissions has increased with the introduction of Selective Catalytic Reduction (SCR) units to control NOX emissions. Prior to SCR usage, it has been the corrosive nature of SO3/H2SO4 and its’ affect on downstream equipment and ductwork, that has fueled efforts to understand its’ formation and the means to control or mitigate its’ affects. In addition, SO3 emissions can cause opacity accidences, interfere with activated carbon control of mercury emissions and bias particulate test results. Wet chemistry test methods do not provide real-time data often needed to minimize additive fuel rates used to control SO3 emissions. To both lower opacity levels while maintaining ESP fly ash conditioning, a facility will undertake a series of process control modifications; additive feed rates, and even comparison of different additives. These operations are time consuming and costly. The use of a real-time SO3 monitor allows sources to make these changes and receive feedback in a timely and cost effective manner. A comparison of the Controlled Condensate wet method and real time monitor test results will also be provided. The benefits of a real-time SO3 analyzer (vs the CCM approach) will also be discussed as they pertain to ease of set-up and operation, results by method, cost, and the ability of each method to provide information in a timely manner. Click Here For Complete Speaker Text
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