Management of by-products from IGCC power generation, IEACR/38

Author(s): Lee Clarke

Ref: IEACR/38
ISBN: 92-9029-191-5
Published Date: 01/05/1991
No. of Tables: 25
No. of Figures: 23
No. of Pages: 73


This report assesses current developments in the management of by-products from IGCC power generation. The sources of residues and other by-products in the different streams from IGCC processes are summarised. Variations in the chemical, physical, and geotechnical characteristics of the residues are examined with a view to optimising disposal or utilisation. Legislation and leaching tests used in different countries are compared, and disposal practices discussed. The leaching characteristics of various IGCC residues are examined. Available results indicate that most residues can be classified as non-hazardous wastes under present regulations. Landfill currently provides a simple way of disposing of most gasification residues, but in future dumping may be unacceptable. Possible applications for by-products from IGCC power generation include uses in agriculture, in building and structural materials, as industrial materials, and for materials recovery. Bonded applications, which affect the greatest protection to the environment against leaching are preferred in some countries. The successful management of IGCC residues requires detailed understanding of the nature and quantity of the waste products, knowledge of the legislative constraints that control the use and disposal of waste products and their leachates, and optimal disposal and utilisation methods in order to minimise environmental impact. The variability of some residues is a major handicap in commercialisation of their applications. Balanced management strategies for these residues need to be adopted for site-specific conditions and requirements. Slags currently comprise the bulk of IGCC residues from pilot and demonstration plants. It should be possible to utilise slags in many applications traditionally associated with conventional coal-use residue, as well as some new uses specifically suited to these by-products.

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