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MULTI-POLLUTANT CONTROL SYSTEM LAUNCHED BY BOC AND BEAUMONT ENVIRONMENTAL AT MEDICAL COLLEGE OF OHIO
The LoTOxTM technology installed on the three, coal-fired boilers at the Medical College of Ohio. The project is designed to demonstrate advanced technologies that will allow the burning of lower-cost coals while reducing nitrogen oxides, sulfur oxides, fine particulates and other air emissions. MCO, located in Toledo, is hosting the project; SFT Inc., of Toledo, is acting as consulting engineer. Pittsburgh-based Beaumont Environmental Systems and BOC are providing the pollution-control technology, an advanced dry SO2-removal process known as RAP, combined with the LoTOx advanced NOx removal system. BOC’s LoTOx technology, reduced NOx emissions to less than five parts per million at outlet, down from approximately 80 ppm on inlet, according to preliminary data. Rob Kelton, Manager of Process Support, said, "The LoTOx system has performed above expectations, far exceeding our target of 90-percent NOx removal. In fact, the entire multi-pollutant removal strategy is working exceptionally well. The preliminary data on all the technologies involved in this unique project are extremely encouraging." "The LoTOx system is a simple, effective, reliable, low-cost compliance solution for anyone seeking to reduce their NOx emissions," Kelton added. A full protocol of testing is foreseen at the facility to fully evaluate the long-term performance of the technology. In order to reduce operating costs, MCO engaged SFT to develop a project proposal for the addition of a SOx control system that would allow the burning of higher-sulfur coal in MCO’s on-site boiler. The project was subsequently expanded to include the addition of BOC’s LoTOx System for control of NOx emissions. The complete system is expected to achieve 90-95 percent control of SOx, NOx and particulate emissions from three boilers, rated at 25 megawatts, firing 3 percent sulfur Ohio coal. Will Goss, BES’ vice president of operations said, "This is an exciting project. Not only is it the first operation of a multi-pollutant control system, but it is also entirely retro-fit technology that is easily adaptable to coal-fired industrial boilers. In the early operation, using 1 percent sulfur coal, the unit was able to easily achieve 90 percent removal efficiency and operated as high as 97.5 percent removal." The LoTOx System is designed for 90± percent removal of the NOx in the boiler flue gas. The equipment consists of an ozone generator and a reactor duct where the ozone is introduced into the flue gas. The ozone acts as an oxidizing agent, converting relatively insoluble NOx to higher oxides of NOx. Higher oxides of NOx are readily soluble and easily removed in a wet scrubber. The system will meet the Clean Air Act emission standards for NOx which become effective starting 2003. The SOx control system is also designed to achieve 90 percent control. It consists of a reactor where lime sorbent is introduced into recycle material and then into the flue gas where it reacts with the acid gases. The resulting material is collected in a fabric filter and recycled back into the reactor. The existing MCO system had an electrostatic precipitator for particulate control, which could not meet proposed new particulate standards. The new system includes a pulse-type fabric filter designed for high recycle rated and high-efficiency particulate removal that will meet these standards. The LoTOx technology is the recipient of the 2001 Chemical Engineering Magazine’s Kirkpatrick award, granted every two years to honor outstanding chemical engineering technology that has been successfully developed and commercialized.
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