Process for the pyrolysis of coal in dilute-and dense-phase fluidized beds

Patent · Tue Jul 01 04:00:00 EDT 1980

OSTI ID:5156304

Roberts, S

A description is given of a process for the pyrolysis of coal comprising, (A) countercurrently contacting coal subdivided to a particle size fluidizable in gas in the form of a relatively cool, upwardly mving fluidized mass in a first vertically-oriented preheating zone with an inert relatively hot first particulate heat carrier thereby transferring sensible heat from the heat carrier to the subdivided coal and heating said coal to an elevated temperature not above the boiling point of water, said coal being fluidized in gas in a manner to create a dilute-phase fluidized mass in said first preheating zone and said particulate heat carrier being introduced in the upper portion of the preheating zone and having a particle size and density such that it falls through the dilute-phase fluidized mass at a substantially uniform rate and collects in the lower portion of the vertical preheating zone as a relatively cool first particulate heat carrier; (B) recovering the bulk of said subdivided coal at elevated temperature in the upper portion of said preheating zone and passing said recovered coal to a second preheating zone; (C) recovering said relatively cool first particulate heat carrier in the lower portion of said preheating zone, and passing said recovered heat carrier to a heat recovery zone; (D) introducing said subdivided coal at elevated temperature into a second verticaly-oriented preheat zone as a dense phase, flidized mass in gas, and countercurrently contacting said fluidized mass with a second inert particulate heat carrier heated to a temperature above the boiling point of water to transfer sensible heat from the heat carrier to the coal and remove any water in the coal, said second particulate heat carrier being introduced in the upper portion of the second preheat zone.

• Assignee: Shell Oil Co
• Patent Number(s): US 4210492
• OSTI ID: 5156304
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
DECOMPOSITION
ENERGY RECOVERY
ENERGY SOURCES
FLUIDIZED BED HEAT EXCHANGERS
FOSSIL FUELS
FUELS
HEAT EXCHANGERS
HEAT RECOVERY
HEAT TREATMENTS
PYROLYSIS
RECOVERY
THERMOCHEMICAL PROCESSES