Ash fouling and erosion of silicon-based ceramic expanders in coal fired power plants
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Ash fouling and erosion of silicon-based ceramic expanders in coal fired power plants

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Published by Dept. of Energy, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English


  • Expansion (Heat),
  • Ceramics.,
  • Silicon alloys.,
  • Steam power plants.

Book details:

Edition Notes

StatementR. W. Taylor, T. E. Shell.
SeriesUCRL ; 52390
ContributionsShell, T. E., Ingraham, R., United States. Dept. of Energy., Lawrence Livermore Laboratory.
The Physical Object
Paginationiii, 15 p. :
Number of Pages15
ID Numbers
Open LibraryOL17647758M

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Fly ash particles entrained in the flue gas from boiler furnaces in coal-fired power stations can cause serious erosive wear on steel surfaces along the flow path. Such erosion can, as a particular example, reduce significantly the operational life of the mild steel heat transfer plates that are used in rotary regenerative heat exchangers. Hot corrosion and erosion are recognized as serious problems in coal based power generation plants in India. The coal used in Indian power stations had large amounts of ash (about 50%) which contain abrasive mineral species such as hard quartz (up to 15%) which increase the erosion propensity of coal. Methods of economically manufacturing ceramic vanes and associated metal shrouds were developed. Nozzle performance was verified for corrosion, thermal shock, and erosion. Detailed cost studies have shown a ceramic vane nozzle can be built for percent of the cost of a metal vane nozzle.   D. Stans (Eskom), Boiler performance indicators, Tutuka Power Station Unit 1. Schedule C23, February I, [6] R.W. Taylor and T.E. Shell, Ash fouling and erosion of silicon based expanders in coal-fired power plants, Lawrence Livermore Laboratory Publ. UCRL, University of California. [7] P.H. Shipway and LM.

  A number of ceramic materials and tube configurations were considered and, while limited coal firing was carried out, a number of problems concerning tube-to-header joining, thermal expansion and contraction during cycling operation, and the ability of the ceramic materials were tested to provide the desired lifetime when fired by coal. Lysholm-type helical-screw engines (expanders) are proposed as a means of generating electrical power from coal-fired power plants (topping cycle). Ash erosion and deposition (fouling) of silicon-based ceramic materials exposed to coal ash at topping-cycle temperatures (approximately K) was studied at the Lawrence Livermore Laboratory to select suitable expander materials.   1. Introduction. Hot gas filtration has been attracting more and more attention in a wide variety of processes over the last years. Main reasons for that are higher demands on emission levels, such as PM 10 and PM , the possibility to simplify or to intensify processes, problems to supply and to clean wash waters for wet scrubbing as well as the development and application of new processes.   The U.S. has historically had the largest coal-fired electric generating capability in the world, while also using a wider range of coal quality. As a result, the U.S. manufacturers have held a pre-eminent world position with respect to the development ana commercialization of technology for coal-fired power plants.

In simple terms, erosion corrosion is caused due to the relative movement between fluid particles and solid surfaces in a corrosive environment. As this form of corrosion affects critical equipment in aviation and other industries, preventive measures are needed at the design stage itself to minimize such deterioration. Coatings play an important role in minimizing surface deterioration due to.   In a coal-fired power plant, a majority of the fly ash produced in the boilers is deposited over the boiler tube walls, economizers, air heaters, and superheater tubes via sliding or a low acute.   Coal ash of Indian coal from power plant would have high silica & alumina & the ash fusion temperature is + deg C. Straw fired plants are operational since erosion . Emission regulations of SO3 for coal-fired power plants, which promote the development of SO3 measurement and control technologies, have been set in some countries and regions.