DE3004385C2 - Rotary kiln for pyrolysis of waste - Google Patents

Description

The invention relates to a rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, an outlet for the carbonization gases, a gas-tight outlet for the solids and one annular baffle plate extending vertically into the furnace from the inner wall of the furnace.

In order to achieve a certain degree of filling in the pyrolysis of waste materials by means of a rotary kiln To be able to drive the rotary kiln, there is at least one ring-shaped baffle plate on the inner wall of the rotary kiln. a so-called stumbling block, arranged. However, this has the disadvantage that always when you shut down a certain amount of solids, consisting of waste materials and their residue products, in the rotary kiln remains, so that when starting up or decommissioning the rotary kiln with a inert gas must be flushed in order to avoid the formation of explosive mixtures when air is admitted.

The invention is based on the object of creating a rotary kiln of the type mentioned at the outset, who does not have this opportunity, d. H. the completely of solids cnilccrl can be.

This object is achieved according to the invention by a rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, an outlet for the carbonization gases, a gas-tight outlet for the solids and an annular baffle plate extending vertically from the furnace inner wall into the furnace, which is characterized that for complete emptying of the rotary kiln (2J of solids (F) the baffle plate (9) in the manner of ekies snap ring is interrupted on the circumference and is bent apart in the axial direction to form a passage (10), the ends of the annular disc overlapping, and the direction of rotation of the furnace (2) is reversible
This embodiment of the baffle ensures that the effect as a stumbling block is retained, but on the other hand all solids from the rotary kiln pass through the passage (10) when the rotary kiln is rotated against the working direction of rotation, whereby no further waste materials are poured into the inlet.

that the largest solids present in the rotary kiln can pass through without jamming. The invention is described below with reference to several exemplary embodiments and schematic drawings described in addition.

F i g. 1 is a longitudinal section through a rotary kiln according to the invention.

FIG. 2 is a sectional view taken along line I-I of FIG Fig. 1.

Fi g. 3 is a sectional view taken along line II-II of FIG.

The rotary kiln (2) shown in Fig.) Has a rotatable circular cylindrical housing jacket, the axis of which is slightly relative to the horizontal is inclined A filling funnel (in the drawing not reproduced) to which the waste materials to be treated are fed us * der n: i> a gas-tight lock, not shown, is provided which can be of known type. The lower end (S) of the housing jacket is adjacent to an end wall which has a gas outlet for the carbonization gases and a gastight outlet for the solids. These peripheral device parts are not shown in the drawing.

Near the lower end (5) is a Baffle plate (9) attached to the inside of the pipe wall. It is ring-shaped and extends from the inner wall of the furnace

so vertically in the oven. It is still interrupted in the manner of a snap ring on the circumference and in an axial direction Flichtung bent apart to form a passage (10). See FIG. 2 and 3.

This baffle plate according to the invention acts as an emptying conveyor, when the rotary kiln is rotated against the operating direction of rotation.

Another embodiment of the inventive concept relates to a rotary kiln ζιτ pyrolysis of waste materials with a gas-tight inlet for the waste material, an outlet for the carbonization gases, and a gas-tight one Outlet for the solids and an annular ring-shaped outlet extending perpendicularly into the furnace from the inner wall of the furnace Baffle plate, which is characterized. that for completely emptying the tube oven

h5 of solids the baffle plate in the manner of a screw turn is formed, wherein the ends of the turn overlap in the axial direction, and the direction of rotation of the furnace is reversible.

Here too, if the direction of rotation is reversed, the Emptying takes place in the furnace

A third embodiment of the inventive concept relates to a rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, an outlet for the carbonization gases, a gas-tight outlet for the solids as well as an annular damming disc extending vertically from the furnace inner wall into the furnace, which is characterized by that the baffle plate consists of a number of obliquely arranged annular diaphragm segments (14) each forming a passage (10), with the ends overlap adjacent segments in the axial direction, and the direction of rotation of the furnace (2) is reversible

This embodiment of the inventive concept is in FIG. 4 explained in more detail

FIG. 4 is a horizontal section through a rotary kiln with annular diaphragm segments.

As the fig. 4, several ring-shaped end segments (14) are arranged in such a way that that the edges of adjacent segments overlap. The overlapping of the ring-shaped lead segments prevents solids from falling through through the passages (10) when the rotary kiln rotates in the working direction. With reverse rotation direction the rotary kiln is emptied.

The dimensions of the passages are to be chosen so large that the coarse, bulky parts of the residue remaining after the pyrolysis can also be closed jamming can happen.

1 sheet of drawings

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Claims (3)

Patent claims: 1. Rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, an outlet for the carbonization gases, a gas-tight outlet for the solids and an annular baffle plate extending vertically from the inside wall of the furnace into the furnace, characterized in that for completely emptying the rotary kiln (2) the baffle disk (9) is interrupted by solids (F) in the manner of a snap ring on the circumference and bent apart in the axial direction to form a passage (10), the ends of the annular disk overlapping, and the direction of rotation of the furnace (2 ) is reversible 2. Rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, a Austa3 for the carbonization gases, a gas-tight outlet for the solids and one away from the Oven inner wall perpendicularly extending into the oven annular baffle, characterized that in order to completely empty the rotary kiln of solids, the baffle plate in Art a screw turn is formed with the ends of the turn overlapping in the axial direction, and the direction of rotation of the furnace is reversible 3. Rotary kiln for the pyrolysis of waste materials with a gas-tight inlet for the waste materials, an outlet ¹ for the carbonization gases, a gas-tight outlet for the solids and an annular dam extending vertically from the inside wall of the furnace into the furnace -. 'Hot, characterized that the baffle plate consists of a number of obliquely arranged annular diaphragm segments (14) each forming a passage (10), the ends of adjacent segments overlapping in the axial direction, and the direction of rotation of the furnace (2) is reversible