PITTSBURGH, PA -
Three new technologies that can help the nation's coal industry turn waste
into energy are now ready for scale up, the U.S. Department of Energy
said today.
Each of the three recover carbon-rich materials that in the past have
been discarded during coal mining and cleaning operations. Using innovative
approaches, the technologies remove unwanted water and other impurities
and upgrade the waste materials into clean-burning fuels for power plants.
The three were first selected for smaller-scale research in August 1998
as part of the Energy Department's Fossil Energy "solid fuels and
feedstocks" program. Now, after the initial research has continued
to show promise, the department has decided to help fund further testing
of the technologies at "proof of concept" scales in commercial
settings. At these scales, the developers will be able to assess the technical
and economic merits of the processes at sizes large enough to determine
whether further commercial development is warranted.
The three projects will be carried out by:
- Virginia Polytechnic Institute and State University,
Blacksburg, VA. VPI will test two novel ways to remove water from fine
coal particles typically discarded in settling ponds at coal mines and
cleaning plants.
- University of Kentucky, Lexington,
KY. University researchers will test an advanced process that first
separates coarse and fine coal particles, then treats each separately
to recover unburned carbon from the fly ash settling ponds at power
plants.
- CQ Inc., Homer City, PA. The company will
develop a coal-sawdust fuel mixture using fine coal particles separated
from slurries using a technology developed in earlier DOE co-funded
research.
As much as 2 to 3 billion tons of coal fines lie in waste impoundments
at mines and washing plants around the country. Each year, another 30
million tons of coal mined in the United States is discarded into these
waste ponds. If an economical way can be found to extract this currently
wasted energy resource, coal operators could turn many of these unsightly
and environmentally troublesome disposal sites into new sources of fuel
for today's power plants.
The three projects will be managed by the Energy Department's National
Energy Technology Laboratory, the government's lead fossil energy research
facility.
Project Details
Virginia Polytechnic Institute and State
University, Blacksburg, VA, will test two fine-coal dewatering
technologies: 1) novel, low-cost reagents that increase process kinetics
in mechanical dewatering processes resulting in significantly lower product
moisture, and 2) an innovative centrifugal filter that reduces cake moisture
while improving coal recoveries. The first will be tested in two "proof
of concept" plants: one at an existing coal preparation plant to
help recover fine coal that is currently being discarded, the other at
a pond reclamation project. The centrifugal filtration technology developed
in Phase I will be scaled up to pilot-plant level and will be used to
conduct on-site testing at various industrial locations. The technologies
will be tested at plants operated by CONSOL Energy, Red River Coal Co.,
and Beard Technology. The proposed technology fills a significant industry
need for reducing the high measure of moisture retained in the fine coal
fraction that causes numerous materials handling problems and limits the
use of many fine-coal cleaning technologies.
Total project cost: $6.9 million; DOE share: $950,000; participant
share: $6.03 million;
Project duration: 3 years.
University
of Kentucky, Lexington, KY, will test its Fuel Float™
technology in a "proof-of-concept" plant in an effort to recover
unburned carbon from fly ash settling ponds at the Western Kentucky Energy's
521-MW Coleman Plant in Hawesville, KY. The technology uses hydraulic
classification to first split the feed material into coarse and fine size
fractions. The fractions are then treated separately using spiral concentrators
and froth flotation to recover carbon and produce low-carbon, fly-ash
by-products. The "proof of concept" plant will operate at feed
rates of 2 to 5 tons/hour, and will produce 300 tons of a concentrated
carbon product that will be combined with the Coleman Plant's regular
feed coal in a 5:95 ratio for a full-scale, 24-hour test burn. Air emissions
and changes in the fuel will be monitored during the test burn. This technology
directly addresses high levels of unburned carbon in fly ash brought about
with the expanded use of low-NOx burners and the need to reduce and reclaim
fly ash waste ponds.
Total project cost: $1.7 million; DOE share: $850,000; participant
share: $850,000
Project duration: 3 years.
CQ Inc.,
Homer City, PA, will test a coal-sawdust fuel mixture made utilizing
the GranuFlow Process, a NETL-developed technology that separates and
dewaters coal fines from coal-water slurries. Coal from a commercial fine-coal
slurry pond, fuel-production facility operated by the company and sawdust
from local paper mills and furniture-production outlets will be used.
Initially, continuous pilot-scale runs of the technology will be conducted
at NETL's facility in Pittsburgh to verify operating conditions. Proof-of-concept
testing will then be conducted at the CQ Inc facility in Ginger Hill,
PA, to further demonstrate the technology and produce 50 tons of a bituminous
waste coal-sawdust fuel that will later be tested in a commercial-scale
pulverizer to determine the fuel's suitability for use in the pulverized
coal market. This project focuses on alleviating fuel blending and handling
problems associated with co-firing biomass with coal, considered to be
an important method for reducing greenhouse gas emissions and other pollutants
from power plants.
Total project cost: $300,000; DOE share $150,000; participant
share: $150,000
Project duration: 2 years. |