Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing
Patent
1985-04-30
1986-07-22
Dees, Carl F.
Fuel and related compositions
Liquid fuels
Aluminum or heavy metal, other than lead, containing
44 10H, 44 13, 425237, 2642976, C10L 506, B30B 1100
Patent
active
046017283
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a method of preparing a material for hot briquetting and to an apparatus for carrying out the method.
A method of this kind for preparing a briquetting material is known from German Pat. Nos. 15 71 710 and 16 71 377. The methods described in these two patents relate particularly to measures aimed at the recovery of some of the crude tar from the briquetting material during the compaction. According to German Pat. No. 15 71 710, the yield of crude tar should range between 0.2 and 0.8%, and according to German Pat. No. 16 71 377,between 0.07 and 0.2%. It was primarily intended to obtain a maximum tar extraction from the briquetting material. Indicated as important features of the method are mixing temperatures of 450.degree. C. to 530.degree. C., and a dwell time of the briquetting material of 1 to 15 minutes. It has been found in this connection that what reaches the briquetting press is not always a uniformly mixed briquetting material, and that particularly the degassing and tar removal vary. Already in briquetting presses having a roll width of more than 400 mm, this drawback resulted in a reduction of the total output to less than about 7 tons per hour.
SUMMARY OF THE INVENTION
The invention is directed to a method and apparatus for preparing a material for hot briquetting having a consistency as uniform as possible, to spread this material uniformly over briquetting press rolls, even such having a width in excess of 400 mm, to always obtain briquettes with the same consistency and strength, and to ensure very high outputs of more than 7 tons per hour, up to 70 tons per hour.
In accordance with the invention, this is obtained by providing the features of the main claim.
Underlying the invention is the experience that what matters is particularly the periods of dwell in the various zones through which the briquetting material passes. First, it is necessary to mix the individual components having unequal temperatures with each other very quickly and effectively, and to provide enough time for the pyrolitic process within the reactor.
The briquetting material should remain in the reactor for a time sufficient for a satisfactory pyrolysis and degasification since insufficiently degassed briquetting material, especially if detarred, tends to burst again after being compacted. On the other hand, an excessive degasification involves a risk that the bituminous coal loses its binding capacity and the product becomes sandy and thus highly susceptible to abrasion. Finally, in accordance with the invention, the briquetting material should be distributed, within a certain time and under certain conditions, over the entire width of the briquetting rolls.
According to the invention, the briquetting material is to be kept in the traveling bed reactor in continuous mixing and kneading motion, namely, initially, in a rotational mixing and kneading motion predominantly at levels parallel to the plane of the roll axes while at the same time migrating downwardly by gravity at an average speed of less than 3 centimeters per second, and toward the end, in a rotational motion substantially perpendicular to the initial motion, to be distributed uniformly over the entire width of the briquetting rolls. Particularly the interaction between the horizontal mixing and kneading motion and the subsequent vertical rotational motion results in a very uniform consistency of the briquetting material over the entire width of rolls, so that even double roll presses with roll width far exceeding 400 mm and having very high outputs can be supplied uniformly.
It has been found advisable to produce the mixing and kneading motion, in accordance with the invention, by means of at least one stirring mechanism having stirring arms which rotate at an average circumferential speed of 1 to 4 meters per second, and lower stirring and distributing arms which rotate at the same time about a substantially horizontal axis at a circumferential speed of 0.5 to 2.5 meters per second. It is fur
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Beckmann Franz
Birscheidt Henri
Dungs Horst
Dees Carl F.
Firma Carl Still GmbH & Co. KG
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