The Bechtel Confined Zone dispersion Process for FGD Retrofit Situations Proof-of-Concept Tests |
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| Authors: | H W Pennline J H Tice J T Newman J Z Abrams A D Benz |
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| Institution: | 1. U.S. Department of Energy , Pittsburgh Energy Technology Center , Pittsburgh , Pennsylvania , USA;2. Pennsylvania Electric Company , Johnstown , Pennsylvania , USA;3. Bechtel National, Inc , San Francisco , California , USA |
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| Abstract: | The Bechtel Confined Zone Dispersion (CZD) process for FGD retrofit situations was tested at two sites: one at a level of 5 MWe; the other at 70 MWe. The CZD process involves injecting a finely atomized slurry of hydrated lime into a straight run of duct between a boiler's air heater and its electrostatic precipitator (ESP). The effect of process variables on SO2 removal and ESP performance was investigated for dolomitic/calcitic lime. Removals of SO2 in excess of 50 percent were achieved for either lime type at the 5 MWe site. A very short duct length limited injection rate at the 70 MWe site, limiting sulfur removals to a maximum of 30 percent. SO2 removal data for both sites were successfully correlated on a common basis. ESP performance was not fully acceptable during lime injection at both sites, but it is felt that optimization of ESP operations should eliminate this problem. Additional testing is recommended to further explore ESP performance and to optimize lime injection parameters. The results obtained to date continue to indicate that the CZD process is an attractive and economical candidate for FGD retrofit situations. |
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