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An oil and gas company in Arroyo Grande developed the Flue Gas Scrubber/WESP (Wet Electrostatic Precipitator) project to mitigate high concentrations of hydrogen sulfide gas in its production stream. The flue gas treatment was selected over a thermal oxidizer or waste gas scrubber because the other treatments had potential to interfere with development of the reservoir. To explore alternatives, Cannon provided preliminary engineering for a thermal oxidizer prior to moving forward with the flue gas scrubber design.

To accomplish this goal, the final project design used two new steam generators, a two-stage flue gas scrubber, a WESP, and a new load center and motor control center enclosure. Cannon brought diverse expertise in civil engineering, automation engineering, panel fabrication, programming, and automation integration services to the project. The implementation phase was challenging for its unique needs to keep the steam plant online during construction, calling for an interim control panel to manage a multi-phased build-out of the plant. During this process, Cannon implemented one temporary control panel, a nine-foot primary control panel, two fiber switch panels, two fiber termination units, and two flue gas diverter valve relay boxes. Ultimately, the team was successful in their efforts to mitigate hydrogen sulfide byproducts, making a safer production stream which was not impaired by construction.

*Hydrogen sulfide is a toxic gas which his colorless, but its potent odor bears a likeness to rotten eggs. Flue-gas scrubbing is a process for removing gases like these using lime, which reacts with sulfur dioxide to form calcium sulfite particulates. These are then removed with a wet electrostatic precipitator, or WESP.

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Arroyo Grande, California