Coal Age

APR 2016

Coal Age Magazine - For more than 100 years, Coal Age has been the magazine that readers can trust for guidance and insight on this important industry.

Issue link: https://coal.epubxp.com/i/668539

Contents of this Issue

Navigation

Page 41 of 51

Potential for beneficial reuse of proper- ty: Once the paste has desiccated (or in the case of pozzolanic materials, cured), the surface may be available for other uses, maybe as parkland, a wildlife habitat or re- use as industrial or housing property. This can go a long way to building good rela- tions with regulatory authorities and the general public — taking a potential prob- lem and creating beneficial reuse. Hurdles to Overcome in Using Paste f or CCR Disposal While paste applications for CCR may be new to some members of the power sec- tor, there have already been two paste plants for CCR management in the USA built by Golder Associates. This company has also been doing other work, such as testing, feasibility and conceptual studies in Brazil and the U.S. (details below). There are still some issues to be overcome with in regards to using paste technology for disposal of coal combustion residuals. Regulatory approval: While the U.S. EPA and other regulatory bodies at federal and state level may be aware of paste technolo- gy, it is still a new idea to many officials. This makes it important for any power producer considering paste for CCR applications to work closely with relevant officials on a local basis, introducing them to the idea and explaining how it works. It helps if the power utility has both internal and external resources that are familiar with paste tech- nology and can answer regulators' ques- tions. There are multiple active sites in the U.S. using paste technology both in the pow- er sector as well as the mining sector that are available to visit to demonstrate the plant, system and deposition strategies. Defining "solid" versus "liquid": One of the issues yet to be determined is the regu- latory approach to whether paste can be defined as a solid or liquid. While it is mixed in the plant to a form that can be pumped through a pipeline, paste cures within hours or days into a solid form that is trafficable and can be vegetated. As mentioned above, with minimal to no bleed water and the lack of ponded water in the deposition area, paste is not consid- ered a slurry. It is more of a "dry" material but without the dust and additional equip- ment, i.e., trucks, conveyors and dozers required to move dry materials. Reducing the footprint: Many power plants are on highly constricted footprints, so space is at a premium. Also, there is generally a need to limit the amount of property that must be permitted. Coal- fired power applications using paste tech- nology will find because of the strength in the material that "stacking" the material becomes a reality. The stacking angles that can be achieved can range from 2%-7% and can greatly reduce the footprint of the containment facility or add years of life onto existing facilities. o p e r a t i n g i d e a s c o n t i n u e d 40 www.coalage.com April 2016 • 24/7 service hotline • Original OEM parts • On-site field service • Equipment re-manufacturing • Full "As New" warranties Get the Details! 5-Star Service Technicians provide preventive maintenance evaluations and emergency repair service. Rebuilds • Parts • Service Keep Equipment at Peak Performance Before After Before After Electro Magnet Rebuilds Wet Drum Separator Rebuilds Call 888-300-3743 or visit www.eriez.com Flow loop testing was done to provide friction loss values for the design of the distribution pipeline and to select an appropriate pump.

Articles in this issue

Links on this page

Archives of this issue

view archives of Coal Age - APR 2016