Advanced Coal Gasification Technical Analyses. Appendix 2: Coal Fines Disposal

摘要

The report is a compilation of several studies conducted by KRSI under the Advanced Coal Gasification Technical Analyses contract with GRI. It addresses the issue of disposal and/or utilization of the coal fines that cannot be used as feedstock for fixed bed (i.e. Lurgi) gasifiers. Specific items addressed are: (1) Technical, legal and economic aspects of fines burial, (2) Estimation of the premium for fines-free coal delivered to an SNG plant and resulting reduction in SNG production costs, (3) Comparison of the relative advantages and limitations of Winkler and GKT gasifiers to consuming fines, (4) Review of coal size consist curves in the GRI Guidelines to assess the fines content of ROM coals, (5) a first-pass design and cost estimate using GKT gasifiers in tandem with Lurgi gasifiers in an North Dakota lignite-to-SNG plant to consume full range of coal-size consist, (6) Evaluation of the General Electric technology for extrusion of coal fines and testing of the extrudates in a fixed-bed gasifier, (7) Investigation of equipment and variables involved in briquetting of coal fines, such that fines could be fed to the gasifiers along with the lump coal.