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Show I • I - ....... One potential additional benefit of the SNRB process is the ability to operate the airpreheater at lower flue gas outlet temperatures, thus improving heat recovery and boiler efficiency. The flue gas acid dew point upstream of the air preheater will be lowered by 75° - 125°P because of the removal of S03 from the flue gas. The lower acid dew point would permit air preheater operation at a lower flue gas temperature than currently possible, without encountering acid corrosion problems. This could represent an incremental energy recovery of about 1 to 3%, thus making the SNRB process one of the few SO /NO x removal processes that could increase - rather than decrease - a power plant's net power output. SNRB DEVELOPMENT The SNRB technology has been developed in a series of pilot-scale tests at B&W. Two of these test programs we.re conducted under contracts with OCDO. nese pilot-scale tests have achieved encouraging results, with SO removals from 70 - 90% with calcium- and sodium-based x sorbents, NOx removals of 80+%, and particulate removal greater than 99.8%. Some of these pilot test results are summarized in a previous paper.[2] Based on these pilot test results, B&W has proceeded with scale-up of the SNRB process to a 5-MWe field demonstration. S-MWe SNRB DEMONSTRATION PROJECT Project Objectives The overall objective of the SOx-NOx-ROx Box Flue Gas Cleanup Project is the demonstration of an advanced flue gas cleanup process for the combined removal of S02' NOx' and particulates from a commercial, coal-fued utility boiler flue gas. This 5-MWe project is necessary to demonstrate that the SNRB process is ready for commercial application. Specific objectives of the project include the demonstration of: • 70 - 90% S02 removal at a cost-effective sorbentlsulfur ratio. • Up to 90% NOx removal at a cost-effective Nl\INOx ratio. • 99.9+% particulate removal. • Pollutant removal efficiencies in an integrated single-unit operation. • Long-term operability of such a unit. • The potential for improved boiler efficiency (lower exit gas temperature) because of a reduced S03 concentration in the flue gas. The SNRB demonstration project will be installed and operated at the Ohio Edison's R.E. Burger plant in Belmont County, Ohio, along the Ohio River. The proposed demonstration facility will be designed to handle and treat a 5-MWe equivalent slipstream from the Boiler No.8. This boiler is a pre-NSPS, 156-MWe B&W pulverized-coal-fued, radiant, drum-type boiler equipped with an electrostatic precipitator (ESP). |
