This task report is one of four reports under Research Project 537-1, which supports specific development efforts directed toward improving the efficiency and reliability of lime-limestone scrubbers. The project is designed to make maximum use of the unique TVA Colbert pilot plant facility in comparing the performance of various lime-limestone scrubber designs on a subsystem approach. The facility was used to test and evaluate absorber-contactor types, reheater configurations and schemes, and construction materials that may be used in scrubber system subloops. Results of Colbert tests showed excellent sulfur dioxide removal efficiencies, generally greater than 85 percent, low pressure drop, and high particulate removal efficiencies. This report covers these screening tests. This evaluation indicates that commercial application of the cocurrent scrubber concept may save substantial capital investment by reducing the number of scrubber modules and auxiliary equipment. These evaluation tests provided the basis for the design and construction of the 10 MW cocurrent scrubber at the Shawnee Facility.
