Process for recovering heat from the combustion of residual carbon in oil depleted shale

Patent · Tue Dec 25 04:00:00 EST 1984

OSTI ID:5927375

Jaquay, L H; Mengon, A C

As hot oil depleted shale from an indirect retorting process passes downward through a vertical shaft furnace, the residual carbon in the shale is burned out in the upper portion by air fed into the top of the furnace. The temperature of combustion is moderated by an inert gas also fed into the top of the furnace. Additional inert gas fed into the bottom of the furnace flows upward in countercurrent contact with the descending hot shale to cool the shale and heat the inert gas. The downwardly flowing gases from the upper, combustion portion of the furnace and the upwardly flowing gas from the lower, cooling portion are withdrawn from the furnace intermediate the upper and lower portions. The inert gas can be recycle gas which is heated by direct contact with the hot shale, a separate inert gas which is circulated through the heat exchanger to heat the recycle gas or a combination of the two.

• Assignee: Dravo Corporation
• Patent Number(s): US 4490237
• OSTI ID: 5927375
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040900* -- Oil Shales & Tar Sands-- Waste management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320304 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
BITUMINOUS MATERIALS
CARBON
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
ELEMENTS
ENERGY RECOVERY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
FURNACES
GASES
HEAT EXCHANGERS
HEAT RECOVERY
INERT ATMOSPHERE
MATERIALS
NONMETALS
OIL SHALES
OXIDATION
RECOVERY
RECYCLING
RESIDUES
SPENT SHALES
THERMOCHEMICAL PROCESSES