DEVELOPMENT OF POTENTIAL USES FOR THE RESIDUE FROM FLUIDIZED BED COMBUSTION PROCESSES. QUARTERLY TECHNICAL PROGRESS REPORT, MARCH--MAY 1978

Because of basic differences in the composition of the spent bed residue and fly ash materials from FBC boilers, these materials should be collected separately and not mixed. Some conditioning or hydration of FBC residue is necessary in order to properly prepare the residue for use in structural compositions without subsequent detrimental volume expansion. The level of conditioning plays a significant role in the performance of the material. The extent of the conditioning must be more fully investigated, but may be related to the chemical composition of the residue. Chemical analyses of FBC materials indicate basic similarities of residues from boilers in which limestone was used as the sorbent material in the bed. Likewise, the composition of residues from boilers in which dolomite was used as the sorbent are similar to each other, although different from the limestone bed materials. Continued monitoring of stabilized road base specimens containing FBC residue under low temperature curing conditions has shown surprisingly good compressive strength development, although the pattern of strength gain is sometimes erratic. Of the compositions tested to date, involving FBC residue percentages ranging from 6 to 80 percent by weight, long-term compressive strength in excess of 2500 psi were obtained in nearly all cases. Proper blending of FBC residue and FBC fly ash seems to produce a material that can be extruded and fired into a synthetic lightweight aggregate product, although further refinement of the blend formulation is needed. Placement of FBC residue in uncovered stockpiles will result in a hardening or cementing of the exposed outer surface of the stockpile. (ERA citation 04:000119)

  • Corporate Authors:

    Minnick (L.J.), Incorporated

    Plymouth Meeting, PA  United States  19462

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Minnick, L J
  • Publication Date: 1978-8

Media Info

  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00191178
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: EF-77-C-01-2549
  • Files: TRIS
  • Created Date: May 11 1979 12:00AM