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Part 5: Addressing the Impacts of Changing Regulations and Feedstocks in Sulfur Recovery Units

Part Five of a five part series.

Continuous emissions monitoring systems (AT7)

Measurements at the thermal oxidizer are driven by regulatory requirements. Many users are required to measure SO2, NOX, H2S, CO, CO2 and sometimes O2 concentrations. Most of the regulated components are going to be present in low ppm concentrations. There are many technologies used by many suppliers of continuous emissions monitoring systems (CEMS), but it is critical to consider where this measurement is occurring. The SRU is constantly handling and converting a gas stream that is highly toxic and corrosive. AMETEK’s experience indicates that careful consideration of potential upset situations leads to design and implementation of the most reliable measurement systems. A system that is designed to handle any SX or SO3 carryover is going to be more complex and more expensive, but maintain a much higher uptime in the SRU than one designed to measure furnace effluents (as an example) elsewhere in the plant. The increased uptime reduces fines from regulatory agencies that can quickly exceed the price difference between a basic CEMS and one designed for purpose. This is another measurement point for which working closely with other members of the global SRU community is recommended, in order to solicit feedback on best solutions and not focus on a specific analytical technology. In being completely transparent, AMETEK integrates a variety of technologies when asked to provide an SRU CEMS, based on experience and end user requests.

Part One - Introduction
Part Two - Feed Gas Analysis 
Part Three - Tail Gas/Air Demand Analyzer
Part Four - Tail Gas Treatment

Learn more about AMETEK's solutions for continuous emissions monitoring.


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