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Gary D. Mooney, Sales Engineer Clyde Bergemann Delta Ducon (CBDD), discussed four viable bottom ash systems and solutions that can be retrofitted to existing power plants desiring or being required to remove an ash pond. Two systems involve replacement of the existing equipment under the boiler while two more retain the existing boiler island equipment and divert the ash slurry to new dewatering equipment. Many power plants are using wet sluices for bottom ash. The dry system has the advantage of increasing boiler efficiency if only slightly. The other systems are easier retrofits in many instances.
Revision Date: 1/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Clyde Bergemann, Conveying
Ari Schoen Lewis, Environmental Toxicologist and Manager of the Toxicology Team at Gradient Corporation, indicated that human health risk analysis is important in shaping the regulations. EPA is anticipating more input. One complication is the importance of emerging toxicological assessments of the chemical constituents in CCRs (e.g., arsenic, cobalt and chromium). Because the risk is now deemed higher, some constituents have assumed new importance.
Revision Date: 1/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Gradient, Testing
Patrick Garcia Strickland, Laboratory Director at Frontier GeoSciences, Inc., discussed metals mobility in coal combustion residues and analytical techniques for monitoring flyash ponds. Knowledge of the ability of metals to be released from coal combustion residues is an important factor in determining the potential effects on the environment. At the end of the presentation there was a discussion of the benefits of leaching the metals out of the flyash at the plant site. Coal –fired power plants can make 30 percent hydrochloric acid and at the same time leach metals from the flyash. The metals are captured in ion exchange resins and the purified acid is sold. This will make higher chlorine coals more attractive and result in a metal free fly ash, rare metals, hydrochloric acid and gypsum as byproducts.
Revision Date: 1/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Frontier GeoSciences, Testing