U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Slag deposits forming on tubes in platen
      area of a coal-fired boiler at Alliant Energy WP&L, Columbia
      Energy Center Unit 1, Portage, Wisc
A
Ash deposit removed from steam tubes in a coalfired
      boiler at an AmerenUE plant using subbituminous coal from
      the Powder River Basin, Wyoming
B

Figure 15. Photographs of mineral deposits ("slagging and fouling") on boiler pipes. A, Slag deposits forming on tubes in platen area of a coal-fired boiler at Alliant Energy WP&L, Columbia Energy Center Unit 1, Portage, Wisc. Tubes are about 1.75 inches in diameter. B, Ash deposit removed from steam tubes in a coal-fired boiler at an AmerenUE plant using subbituminous coal from the Powder River Basin, Wyoming. The plant was originally designed to use bituminous coal. Ash fragment is approximately 12 inches long by 5 inches wide by 3 inches tall at its tallest point. This deposit was removed by explosive cleaning. Photographs by C.J. Zygarlicke (University of North Dakota Energy and Environmental Research Center, Grand Forks, N.D.); used with permission of Alliant Energy, Portage, Wisc. (A), and AmerenUE, St. Louis, Mo. (B).


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