Method and apparatus for calcining limestone using coal combustion for heating

Patent · Tue May 24 04:00:00 EDT 1988

OSTI ID:6915926

Dilmore, J A; Lee, S Y; Young, W E; Rohrer, Jr, W M

A method of firing a lime kiln having a calcining chamber in rotary vessel with limestone charged to one end thereof and hot gases applied to the other end, with a hot gas stream passing therethrough countercurrent to the flow of limestone to produce lime, such that the formation of a slag ring in the rotary vessel is retarded or eliminated is described comprising: providing a two stage combustion unit for producing the hot gases; charging a solid carbonaceous fuel and air in the first stage of the two stage combustion unit and combusting the fuel; removing at least 75 percent of the molten slat from the hot combustion gases and discharging the slag from the first stage of the two stage combustion unit; passing the hot combustion gases and any residual solid carbonaceous fuel into the second stage of the two stage combustion unit; charging air to the second stage to effect combustion of the hot combustion gases and any residual solid carbonaceous fuel in the second stage of the two stage combustion unit, to produce a hot gas stream; and directly charging the hot gas stream into the calcining chamber for countercurrent flow therethrough relative to the flow of limestone therein, and exhaustion therefrom.

• Assignee: Westinghouse Electric Corp., Pittsburgh, PA
• Patent Number(s): US 4745869
• OSTI ID: 6915926
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
CALCINATION
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION HEAT
DECOMPOSITION
ENERGY
ENERGY SOURCES
ENTHALPY
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
FUELS
HEAT
HEAT SOURCES
KILNS
LIMESTONE
MATERIALS
MOTION
OXIDATION
PHYSICAL PROPERTIES
PYROLYSIS
REACTION HEAT
ROCKS
ROTATION
SEDIMENTARY ROCKS
SLAGS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES