The Lurgi coal gasifier functions as a pressurized _______________ bed reactor ?
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Answer: A. Moving
Explanation
The Lurgi gasifier is designed with a continuous mechanical bed that moves downward. Coal is fed from the top while gasifying agents flow upward through the fuel bed. This configuration classifies the Lurgi reactor as a pressurized moving bed system. Coal gasification technologies convert solid carbon into synthesis gas under elevated pressure. Moving bed reactors allow long solid residence times and efficient countercurrent heat exchange. Ash is discharged continuously from the bottom of the pressurized reactor vessel.
Large-scale synthetic natural gas plants utilize Lurgi gasifiers for efficient coal conversion. Pressurized operation increases reactor throughput and reduces downstream compression costs. Engineers select moving bed gasifiers for processing reactive coal feedstocks. Fixed beds lack the continuous downward movement of solid fuel seen in Lurgi designs. Fluidised beds suspend solid particles in upward gas streams rather than moving as a compact bed. Entrained bed reactors operate with pulverized fuel suspended in high-velocity gas flows.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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