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Extensive CDS Experience Already Gained in U.S
Lime and hydrated lime are widely available to meet the demands of FGT applications in the U.S. power industry. Lime-based CDS technologies have become popular options to achieve very high removals of multiple pollutants produced from solid fossil fuel-fired electricity generating units. Four lime-based CDS technologies have been installed in 12 PC boilers and 12 CFB boilers. Constructions are underway at 15 PC boilers. These technologies are applied to units with sizes ranging from 58 to 690 MW. Data obtained from AES Greenidge and Sandow Stations showed that the emission limits of Hg, filterable particulate, and HCl mandated under the Mercury and Air Toxics Standards were met. CDS is capable of handling solid fuels with various sulfur contents. CDS is capable of handling wide swing load. Multiple CDS reactor vessels can be placed in parallel to process flue gases from larger units
Revision Date: 3/20/2014
Tags: 221112 - Fossil Fuel 化石燃料, Graymont, Circulating Dry Scrubber, Efficiency, Module
China Can Remove Mercury at Low Cost Thanks to U.S. Developments 中国能以低成本除汞得益于美国的技术发展
In order to meet tough regulations in the U.S. technology developers have made great strides in creating low cost routes to achieve mercury removal from power plant exhausts. The cost is especially low if the plant already has a scrubber. China is installing scrubbers on nearly all its plants. As a result China can remove mercury with just a few percent increase in its air pollution control investment and operating cost. There have been some very significant recent breakthroughs which need to be communicated to the Chinese policy makers. To this end Mcilvaine conducted a webinar in Mandarin Chinese with two FGD experts . A presentation on removal technology was made by Bobby Chen of CBI Shaw. Questions and discussion was provided by Shiaw Tseng of Graymont. This presentation in Mandarin is available as a recording in the Mcilvaine Global Decisions Orchard and on Youtube.
Revision Date: 8/19/2013
Tags: 221118 - Other Electric Power , 221112 - Fossil Fuel 化石燃料, Graymont, CB&I, McIlvaine, Liquid Bromine Injection, FGD, Air Quality, Mercury, FGD, China
Shiaw Tseng, Marketing Manager at Graymont, Inc., described a multi-pollutant control system for existing coal-fired power plants using lime-based Circulating Dry Scrubbers (CDS) to remove SO2, SO3, HCl, and HF. He presented the results of performance guarantee tests conducted at the AES Greenidge Station Unit #4 (107 MW) burning eastern bituminous coal (2.5 to 3 percent sulfur) with a CDS and baghouse. These tests showed pretty impressive reductions of SO2, SO3, Hg and HCl to levels that were well under the limits in the proposed utility MACT. Advantages of this system include a relatively small footprint, fuel flexibility (including biomass), low water consumption and dry byproducts (no wet sludge). Interestingly, the CDS system achieved better mercury reduction than using ACI under the same operating conditions, indicating that ACI is not required. These systems are currently operating at 14 plants in the U.S.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, Graymont, Circulating Dry Scrubber, Lime