On December 19, 2014, the Environmental Protection Agency (EPA) finalized national regulations to provide for the safe disposal of coal combustion residuals (CCRs) from coal-fired power plants. CCRs, generically referred to as coal ash, also includes by-products such as fly ash and bottom ash. Fly ash in particular has been designated as a non-hazardous material, and many of the groups whose input influenced legislation are now focused on reforming the regulations on disposal to be more lenient, promoting responsible recycling of fly ash, such as ASTM C618-grade fly ash processing. In place of disposal, several safe uses for reprocessed fly ash have been distinguished in the new regulations, and are estimated to result in billions of dollars in savings.
Since publication in the Federal Register on April 17, 2015, states are now required to adopt the federal minimum criteria and revise their Solid Waste Management Plans (SWMPs) accordingly for EPA approval. The actual effective dates for each part of the rule varies from 6 months to 30 months.
Dry Fork Station, owned by Basin Electric Co-Op and Wyoming Municipal Power Agency in Gillette, Wyo.
The $1.35 billion Dry Fork Station was commissioned on November 1, 2011 and is a greenfield leading edge coal-fired power plant. It was built to add capacity to meet the needs of the 134-member co-ops of Basin Electric and WMPA. The minemouth plant uses Power River Basin coal. The project had a construction and commissioning timeline of 45 months and finished on budget and two months ahead of schedule.
The project used circulated fluidized boiler (CFB) scrubber technology relatively unknown in the U.S. and untried worldwide at this size. An air cooled condenser minimizes water usage with 45 fans 100 feet off the ground condensing steam for reuse. The plant also uses an advanced control protection technology using foundation field bus for all station-wide systems to protect personnel, cost control and reliability requirements.
EPA declares Fogging Systems as Best Demonstrated Technology for PRB Coal On September 25, 2009 the United States Environmental Protection Agency (EPA) revised emissions control requirements for new coal preparation plants. These revisions were based on a variety of input and comments from those directly involved in the coal industry, including coal mines, power plants, consultants, engineering firms and suppliers of air pollution control systems.
The EPA findings have created new rules that they published in the Federal Register on October 8, 2009 (see PDF File Page 6). The new rules designate“Fogging Systems” as a Best Demonstrated Technology (BDT) for coal handing equipment used on sub bituminous and lignite coals.
BDT as identified by the EPA, is the most effective commercially available means of treating specific types of hazardous waste. Public testimony given to the EPA on fogging systems has revealed what we at DSI have been saying for many years. Dry Fog can be the most cost effective dust control system available while yielding results as good or better than any other control measure.