Heating – With work cooling structure – Combustion feed air cools exiting work by contact
Patent
1995-04-11
1996-10-08
Dolinar, Andrew M.
Heating
With work cooling structure
Combustion feed air cools exiting work by contact
432106, F27D 1502
Patent
active
055624430
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotatable cooler for air cooling of particulate material subsequent to its heat treatment in a rotary kiln, the cooler being mounted on the outlet end of the kiln and comprising several chambers which are parallel to the kiln axis and through which the material can be conducted in counter-current with the cooling air, said chambers being surrounded by a stationary housing.
Coolers of the above-mentioned kind are known inter alia as so-called satellite coolers, for example from the description to British Patent No. 1365171. Such satellite coolers are very effective for cooling of for example cement clinker after burning and areas of application include high-capacity plants.
However, a satellite cooler is rather voluminous and expensive to manufacture and particularly difficult to install on existing kilns not already equipped with a cooler of this type.
It is the object of the present invention to provide a cooler which is both economical to manufacture and of a compact design, and which can be installed on rotary kilns without any major difficulties.
According to the invention this is achieved by a cooler of the kind mentioned in the introduction, being characterized in that the chambers are annular chambers disposed around each other, being inter-coaxial and coaxial with the kiln, and fixed to and protruding away from the material outlet end of the kiln, that the chambers are divided into longitudinal ducts by means of partitions and guide vanes for conveying the material successively through the annular chambers, that the inlet of the innermost annular chamber is connected to the kiln outlet via an annular gap between the cooler housing and the kiln end, that each chamber placed between the innermost and the outermost annular chamber has its inlet connected to the outlet of the immediately preceding annular chamber and its outlet connected to the inlet of the immediately surrounding annular chamber, and that the material outlet of the outermost annular chamber is connected to the cooler inlet for cooling air.
The burner for heat treatment of the material in a rotary kiln is normally fitted in the material outlet end of the kiln. The burner is supplied with combustion air, which is preheated in the cooler, and this airstream enters through the above-mentioned annular gap, thus ensuring that the air is effectively distributed around the burner.
Given that the burner is fitted in such a way that it protrudes away from the kiln end, it is possible to support the kiln very close to its outlet end and to achieve more effective cooling of this end by the ambient air. Further, the condition of the thermal zone of the kiln can be monitored more effectively, for example by means of infrared measurements.
The internally fitted partitions and guide vanes inside the annular chambers provide a wide range of options for discharging the finish-cooled materials from the cooler, and, therefore, the cooler housing may have a material outlet which is connected to the material outlet of the outermost annular chamber, and which is located at that part of the annular chamber being the uppermost at any time.
With the material outlet being placed at such a high level, it is possible to attain a low building height for the entire kiln installation and also to obtain space for equipping the material outlet of the cooler housing with a material chute having at least one grate for separating the cooled material into particle size fractions.
In order to disintegrate oversize lumps of material which may get stuck in the annular gap, thus causing stoppage and wear, material disintegration means may be fitted in the annular or inlet gap of the cooler.
The inlet for cooling air to the cooler may advantageously be formed by an annular air gap between cooler housing and the outermost annular chamber.
Since the different annular chambers are heated to different temperatures, it is advantageous that the annular chambers are connected to one another and to the housing with due allowance for expansion, for example by
REFERENCES:
patent: 1404381 (1922-01-01), Fasting
patent: 1690048 (1928-10-01), Bentley
patent: 2001258 (1935-05-01), Lindhard
patent: 2019179 (1935-10-01), Fasting
patent: 3824069 (1974-07-01), Brachthauser et al.
patent: 3891383 (1975-06-01), Kobayashi
patent: 4089634 (1978-05-01), Sylvest
Dolinar Andrew M.
F. L. Smidth & Co. A/S
LandOfFree
Rotatable cooler for a rotary kiln plant does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotatable cooler for a rotary kiln plant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotatable cooler for a rotary kiln plant will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-52849