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U.S. Department of Energy's High-Temperature and High-Pressure Particulate
Cleanup For Advanced Coal-Based Power Systems
Richard A. Dennis
Power & Environmental Systems Division, Federal Energy Technology Center, United States Department
of Energy, Morgantown, West Virginia, 26505
The availability of reliable, low-cost electricity is a cornerstone for the United States' ability to compete in
the world market. The Department of Energy (DOE) projects the total consumption of electricity in the U.S.
to rise from 2.7 trillion kilowatt-hours in 1990 to 3.5 trillion in 2010. Although energy sources are
diversifying, fossil fuel still produces 90 percent of the Nation's energy. Coal is our most abundant fossil fuel
resource and the source of 56 percent of our electricity. It has been the fuel of choice because of its
availability and low cost. A new generation of high-efficiency power systems has made it possible to continue
the use of coal while still protecting the environment. Such power systems greatly reduce the pollutants
associated with coal-fired plants built before the 1970s. To realize this high efficiency and superior
environmental performance, advanced coal-based power systems will require gas stream cleanup under high-
temperature and high-pressure (HTHP) process conditions.
Presented below are the HTHP particulate capture requirements for the Integrated Gasification Combined
Cycle (IGCC) and Pressurized Fluidized-Bed Combustion (PFBC) power systems, the HTHP particulate
cleanup systems being implemented in the PFBC and IGCC Clean Coal Technology (CCT) Projects, and the
currently available particulate capture performance results.
Advanced Power Systems
IGCC and PFBC are two of this new generation of advanced coal-fired power plants. In these plants, coal-
derived gases are cleaned at elevated temperatures and pressures prior to combustion in gas turbine power
generation systems. Such gas turbine systems are expected to achieve exceptional efficiencies by the end of
the decade, assisted in part by a government-sponsored advanced turbine system initiative.1
IGCC Power System
In an IGCC system, fuel gas, which is composed of hydrogen and carbon oxides, is generated in a gasifier
under pressurized conditions by reacting coal with steam and air or oxygen. The pressurized fuel gas is
typically cooled and then cleaned of particulate matter and sulfur at high temperature and fed to a high-
efficiency combustion gas turbine. The hot turbine exhaust gas produces steam to drive a steam turbine. With
the adaptation of hot gas cleanup, large-scale demonstration projects, capable of reaching efficiencies of 45
percent, are expected by the turn of the century. IGCC plant efficiencies will climb to 52 percent and greater
as advanced turbine systems are incorporated.
One of several gasification processes can be employed in an IGCC system. The type of gasification process
can be typified by the oxidant used - either air or oxygen - and the gasifier configuration - fixed-bed,
fluidized-bed, or entrained-bed. The type of gasification process used will impact particle filtration operating
conditions. The different types of gasifiers produce different filtration conditions
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Dennis, R.A. US Department of Energy`s high-temperature and high-pressure particulate cleanup for advanced coal-based power systems, article, May 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc677771/m1/3/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.