DE1729233B - Directly heated drying drum - Google Patents

Description

not shown in the drawing drive set in slow rotation. The flame 2 of the drum heater burns in the right end of the rotary tube, which serves as the combustion chamber. In the area of the flame 2, a sheet metal jacket 3 is easily detachable, that is, it is arranged such that it can be pulled axially out of the rotary tube 1. The Blechmaitel 3 is advantageously kept so much smaller in diameter than the inner jacket of the rotary tube 1 that a gap 5 is created between the two parts. The air enclosed in this air gap acts as an insulating layer and protects the inner jacket of the rotary tube in the area of the flame from the particularly high temperatures there. The introduction of cooling air into the space is even more effective. For this purpose, at least one inlet opening 6 is provided in the vicinity of the jacket end. The cooling air conveyed in any way, not shown in the drawing, under excess pressure or by induced draft occurs at high temperature, e.g. B. via an open mouth 7, into the rotary tube. If the outlet 7 is arranged in the flame area, the heated cooling air can also be fed to the combustion as mixed air. In both cases, the heat economy of the process is improved by reducing external heat losses. In the example shown, the drum is loaded with material to be dried at the end of the furnace, ie the material to be dried moves in cocurrent with the heating gases. Basically, if the arrangement is changed accordingly, inventions can also be

proper drying drums for countercurrent operation are produced.

1 sheet of drawings

Claims (5)

ι 2 abrasive, corrosive and erosive effects Patent claims: to solve and to create a drying drum, the rotating tube of which is protected from the effects of flames 1. Drying drum with directly heated is. The protective fittings should also be used in the event that Rotary tube, one end of which enters the combustion chamber for wear, can be quickly replaced forms an open flame into which the material feeds. line opens directly, marked- According to the invention, the object is achieved by net by one in the area of the flame (2) one inserted in the area of the flame, with the used, releasably connected to the rotary tube (1). Rotary tube detachably connected to the sheet metal jacket those sheet metal jacket (3), the small distance io small distance from the inner wall of the rotary tube from the inner wall of the rotary tube (1) is arranged and in its length approximately the Flamnet and its length corresponds roughly to the length of the flame. The advantage of this inventive success is equivalent to. moderate design is to be seen in the fact that such a 2. Drying drum according to claim 1, marked sheet metal jacket as a spare part in good time through an inlet opening (6) for the 15 and, according to experience, approximately be of cooling air in the space (S) known service life during a break in operation between rotary tube (1) and sheet metal jacket (3). can be exchanged. Besides this for one 3. drying drum according to claim 2, ge uninterrupted production is an important advantage marked by a after the rotary tube (1) note that the material quality of the detachable open mouth (7) of the space (5) 20 sheet metal jacket made no special claims between rotary tube (1) and sheet metal jacket (3). will need so by this arrangement and 4. Tnxknungdrommel according to claim 1, replacement procurement only incurs low costs,
characterized by a closed on all sides. In an embodiment of the invention, there is an inlet opening air space between the rotary tube (1) and sheet metal for the introduction of cooling air into the double jacket (3). 25 space between the rotary tube and sheet metal jacket 5. Drying drum seen according to one of the views. This measure can make advantageous claims 1 to 4, characterized by small or wise the detachable sheet metal jacket and intensively cooled large areas of contact between the rotary tube thus its service life can be increased. (1) and sheet metal jacket (3). The further appropriate embodiment of the invention 30 manure is characterized by an opening of the gap between the rotary tube and the see rotary barrel and sheet metal jacket. This means that in advantageously achieved that the heat absorbed by the cooling air from the sheet metal jacket 35 amount can be used for the drying process The invention relates to a drying drum can. The cooling air can be part of the mixed air with a directly heated rotary kiln, one end of which applies. The supply of cooling air to the rotary kiln Forms combustion chamber for an open flame, into which the can in any known manner via a purpose - Gutzufuhrleitung opens directly. moderately designed inlet opening by blowing or In the case of drying drums, the method referred to above is carried out by means of an induced draft draft (chimney draft). The open exit Neten type known, in the interest of a small flow mouth of the space between the rotary tube and In many cases, direct heating of the pre-detachable sheet metal jacket is required with regard to the length watch, d. H. one end of the drum is the axial direction of movement of the material to be dried Combustion chamber designed for an open flame, designed in such a way that the material to be dried is not which the Gutzufuhrleitung opens directly. The 45 room can penetrate. The inner jacket of such a drum is also made of sheet steel for protection against corrosive and erosive processing of the subject matter of the invention due to all-round influences of the material to be dried. However, it was found that the corrosive attack marked the sheet metal jacket. This measure on the inner jacket in the region of the flame length advantageously ensures that the length of the flame is particularly large. In addition, there is the erosive effect of fresh air as additional insulation against the heat of the items to be dried, which is particularly effective in reducing losses. In addition, the wide-flame area has a strong effect when hard, sharper embodiment of the invention has small or large-area goods, e.g. B. grit, contact points between the rotary kiln and the drying process using the direct current method. In this case, the material to be dried in the sheet metal jacket is considered appropriate. Across the diverse range of the flame of the drying drum, points of contact between the rotary kiln and sheet metal maneuvers. As a result of the strong corrosive and erosive elements, the heat can advantageously be given off directly to the rotary effect on the sheet steel jacket of the drum tube and from there to the surroundings it is passed on in good time in the area of the flame length. The detachable sheet metal jacket can burn through. The repair of a drum that has been burned into the rotary kiln, even with a rough sliding fit, is time-consuming and costly. The damage is usually only discovered when the effects of flames offer advantageous protection against
when it is visible on the outer insulation of the drum. An embodiment of the invention will be applied. Immediate, longer-lasting operational unhandling of a schematic drawing of a longitudinal break is then inevitable. 65 section of the drying drum shown in more detail. The invention is based on the object that at tert: the known design of a drying drum The rotary tube 1 is in a known manner around his occurring difficulties with regard to the longitudinal axis rotatably mounted. It is through one