Document Type and Number:
Japanese Patent JPH0549617
Kind Code:
B2
Abstract:
process and apparatus for manufacturing low sulfur cement clinker from cement raw meal containing sulfur or with fuel containing high levels of sulfur or a combination thereof. The process is carried out in an apparatus which includes a preheater (1), calcining furnace (2), clinkering furnace (3) and clinker cooler (4). A separate source of fuel (70) is added to the feed end (41) of a kiln (40) of the clinkering furnace (3) to maintain reducing conditions and temperatures for decomposing the sulfur compounds. Fresh air is added to a riser duct (56) connecting the clinkering furnace (3) with the calcining furnace (2) and the preheater (1) for converting sulfur dioxide to sulfur trioxide. Calcium oxide is added to the riser duct (56) for absorbing the sulfur trioxide to form calcium sulfate. The calcium sulfate is then removed by a gas solid separator (74,174) from the system. Excess fuel added to maintain reducing condition at the feed end (41) is utilized in the calcining furnace (2).
Inventors:
TOOMASU AARU RAUOORU
Application Number:
JP15186886A
Publication Date:
July 26, 1993
Filing Date:
June 30, 1986
Export Citation:
Assignee:
FULLER CO
International Classes:
F27D13/00; C04B7/44; C04B7/60; F27B7/20; F27D17/00; (IPC1-7): C04B7/44; F27D17/00
Next Patent: JPS549618