DE472462C - Process for the utilization of bituminous brown coal for briquetting - Google Patents

Description

Process for the utilization of bituminous lignite for briquetting The briquetting of earthy brown coal is usually done in such a way that the pit moisture Lignite is first crushed, then through a steam dryer, e.g. B. drum or plate apparatus, is dried to a certain water content (around = 5 percent), whereupon the briquetting takes place by means of extrusion.

In this process, it is essential to have a raw material from to obtain a certain grain, as the grain size both during drying and is of great influence in briquetting. Various shredding and processing facilities are used for this, as need not be explained in more detail. All these However, processes have the disadvantage that, in addition to the granular material, also large ones Amounts of fine material are incurred, some of which is less than the quality of the coal produced from this Adversely affect the briquette. In numerous cases, therefore, one has gone over to after drying a certain percentage of fine coal (coal dust) from the to pull out another operation. In addition, the coarse grain rolls forward in the dryer and the dryer travels faster than the fine grain, so that the individual components of the raw material are dried unevenly. While the coarse grain the dryer If it leaves still fairly moist, the fine material is sharply undried.

These disadvantages are now intended to be eliminated by the present invention will.

Its essence consists in the fact that from the crushed raw lignite the Fine (less than 3 mm grain size) deposited and in a known manner without prior Drying is briquetted, while the rest is dried and in the usual way is briquetted.

As-known is the divorce of the raw brown coal in. Cartilage and coal. The former are either as raw coals especially at the Brought to the market or added back to the fine coals after being crushed and introduced into the briquetting operation together with them.

The colloidal properties can be used in the manufacture of the wet briquette of the fine goods can be used well by disposing of these goods with or without the addition of water and formed into briquettes with or without the addition of alkali.

The granular material obtained in the comminution is according to the present Invention now according to the usual briquetting process described at the outset further processed, d. H. dried in steam dryers and then in extrusion presses briquetted.

The essence of the process can thus be in the union of a brown coal briquette factory the usual way with a lignite wet briquette factory.

The combination of these two briquetting processes offers essentials Advantages both in crushing the raw lignite and in drying of the good.

The crushing machines previously used for processing the raw lignite (Centrifugal or hammer mills, etc.) bring, as already mentioned, inevitably ]I A good comes about that, in addition to coarse grain, also contains considerable quantities of finer good contains. Due to the nature of this comminution process, an approximately uniform grain size is required not to be achieved unless the effort is increased significantly. According to the invention it is possible both granular without increasing the power requirement how to get fine goods by going behind the usual crushers switches on a sifting to separate the goods according to grain size. On this way you then get those varieties that are necessary for the operation of both processes offer greatest advantage.

The method of the present invention can, for example, by executed the apparatus shown schematically in the accompanying drawing will.

The raw lignite is given up at a; b is a 4Teine comminution device (e.g. centrifugal mill, hammer mill, etc.), which causes the comminution of the raw lignite and, at the same time, its sifting into coal dust and granular material. The coarse-grained material falls into the funnel c, the fine-grained into the funnel marked d. The granular material is fed via the screw conveyor e, line f to the tube dryer g, from which it falls, dried, into the briquette press k. The fine grain is either after a short or without any processing by the roller press ki pressed to wet briquettes in egg shape 'and then fed into the dryer i. In this, the drying takes place by means of an air stream which is sucked in by the fan j and preheated in the condenser k. The egg briquettes are then discharged at l. The exhaust steam escapes at m.

Claims (1)

PATENT CLAIM: Process for the utilization of bituminous lignite by briquetting with separation of the wet, crushed lignite into coarse and fine and crushing of the coarse coal, characterized in that the fine (less than 3 mm grain size) is briquetted in a manner known per se without prior drying, during the The rest is dried in the usual way and also briquetted.