Fuel handling considerations when switching to PRB coal
Many power producers have been switching fuels to Powder River Basin coal due its low sulfur content, large supply and low cost. A major consideration when switching to PRB coal is the design of the fuel handling system. Since PRB coal is more prone to spontaneous combustion in silos, bunkers and other areas where it may remain stagnant for extended periods, design of the handling system for reliable, non-stagnant flow is essential. In addition, reduced BTU content and the dusty nature of these coals may require certain upgrades to existing handling systems. This paper describes a systematic approach to reviewing and, as necessary, modifying handling system designs to avoid problems. Potential trouble areas such as coal receiving hoppers, reclaim hoppers, silos, bunkers, and transfer chutes are discussed. Mass flow and funnel flow patterns that develop in silos and bunkers are presented. Funnel flow results in large stagnant regions, which is a major problem for coals that combust easily. Mass flow patterns, which eliminate the stagnant coal regions, are also explained. Coal properties and bunker designs that result in mass flow and funnel flow are described. Transfer chute design techniques to avoid pluggages, reduce dusting, and minimize chute wear are discussed. Union Electric's Rush Island Plant is used as an example where this approach was used to prevent handling problems. Specific example of modifications required for reliable, stagnation free coal flow, which minimizes dusting and considers hopper and chute material wear are described. The cost analysis associated with these modifications is briefly discussed.
- Research Organization:
- Jenike and Johanson (US)
- OSTI ID:
- 20050950
- Report Number(s):
- CONF-971214-; TRN: IM200026%%21
- Resource Relation:
- Conference: 10th International Conference and Exhibition for the Power Generating Industries, Dallas, TX (US), 12/09/1997--12/11/1997; Other Information: PBD: [1998]; Related Information: In: Power-Gen '97 International, [2000] pages.
- Country of Publication:
- United States
- Language:
- English
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