Heating – With work cooling structure
Patent
1997-03-31
1999-04-20
Walberg, Teresa
Heating
With work cooling structure
110270, 110282, 110291, F23H 1110, F23H 708
Patent
active
058952136
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a clinker cooler for cooling cement clinker while conveying the same in a cement plant.
BACKGROUND ART
It has been known to use in a cement plant a clinker cooler by which hot cement clinker formed by burning or firing is cooled by air down to a predetermined temperature while it is conveyed through a predetermined distance.
In this kind of clinker cooler, cement clinker fallen from a rotary kiln is received on grates which are moved to convey the cement clinker to a discharge port. Cooling air in a compartment is jetted through the grates to the cement clinker so that the cement clinker is cooled while being conveyed. Cement clinker is classified due to the rotation of the rotary kiln and graded in grain size on the grates in the direction perpendicular to the grate moving direction. Namely, the thickness and grain size of the cement clinker layer on the grate are unevenly distributed in the widthwise direction. Further, the thickness of the cement clinker layer is unevenly distributed also in the cement clinker flowing direction. This makes the cooling air hard to flow locally, that is, the flow resistance to air is increased locally, resulting in a problem that the cooling of the cement clinker cannot be performed sufficiently.
To solve the above problem, according to a clinker cooler disclosed in Japanese Patent Examined Publication No. 3-21496, each of the fixed grates is equipped with an exclusive air chamber and the quantity of cooling air to be jetted is controlled by varying the pressure of cooling air in the air chamber and the temperature of the grate. However, since all the air chambers communicate with a single fan, complex operation of control valves becomes a necessity in order to maintain the pressure in every air chamber properly.
Further, the capacity of the fan must be selected in conformity with the highest flow resistance to air. This causes the power consumption to increase.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a clinker cooler which has overcome the above problems.
In order to achieve this end, according to the invention, there is provided a clinker cooler comprising: a plurality of grates each having an air hole and arranged in a cement clinker conveying direction in adjacent relation to each other; a driving means for driving some of the grates to convey the cement clinker; a compartment in association with the grate, from which air is supplied to the cement clinker through the air hole to cool the same; distribution chambers each equipped in association with the respective of some of the grates, at least one grate without the distribution chamber being disposed between the two adjacent grates each equipped with the distribution chamber; and a plurality of fans each connected to at least one distribution chamber.
The present invention will be described below in conjunction with preferred embodiments by referring to attached drawings.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a front view of a clinker cooler according to an embodiment of the present invention;
FIG. 2 is a cross sectional view of the clinker cooler of FIG. 1;
FIGS. 3 and 4 are front views of clinker coolers according to another embodiments of the present invention, respectively;
FIG. 5 is a cross sectional view of a clinker cooler;
FIGS. 6 and 7 are fragmentary front views showing states of engagement between grates, respectively;
FIG. 8 is a front view of a clinker cooler according to a further embodiment of the invention;
FIGS. 8A and 8B are cross sectional views taken along lines A--A and B--B of FIG. 8, respectively; and
FIGS. 9 and 10 show a conventional clinker cooler.
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, in a clinker cooler 3 according to an embodiment of the invention, hot cement clinker 11 formed by burning or firing with a burner 2 and coming out of a rotary kiln 1 is conveyed toward a discharge port 9. While being conveyed toward the discharge port 9 by means of grates 5, the cement clink
REFERENCES:
patent: 3831291 (1974-08-01), Kayatz
patent: 4569437 (1986-02-01), Doerges
patent: 4638905 (1987-01-01), Weiss
patent: 5549471 (1996-08-01), Tegtmeier et al.
patent: 5572937 (1996-11-01), Tegtmeier et al.
patent: 5575642 (1996-11-01), Willis et al.
patent: 5617801 (1997-04-01), Hauser et al.
Fujiwara Kazuto
Kaetsu Taro
Mochizuki Akira
Murata Mitsuaki
Sutoh Kanzaburo
Babcock - Hitachi Kabushiki Kaisha
Chichibu Onoda Cement Corp.
Walberg Teresa
Wilson Gregory A.
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