Method and apparatus for separating residues

Abstract

The apparatus for separating residues from a thermal waste treatment into one fine fraction and one coarse fraction comprises a housing (1) abutting on swinging elements (2), said housing having a plurality of diagonally offset plates (3.1-3.5) that are disposed one beneath the other and are connected to said housing (1) by their side edges, and being equipped with means (5) for generating a vibration component oriented in the direction of the plates (3.1-3.5) disposed diagonally offset downward.

Description

The invention will be explained herein after with reference to an 20 exemplary embodiment illustrated in the drawing.

In said drawing

FIG. 1 shows a side view of an apparatus for separating residues from a thermal waste treatment and

FIG. 2 a view of the plant shown in FIG. 1 pursuant to arrow A.

As can be seen from the drawing, the apparatus for separating residues comprises a housing 1 that abuts the bottom through swinging elements 2, in the case illustrated herein through compression springs. Inside the housing, a plurality of non-perforated plates 3.1 through 3.5 is connected to the housing, their inclination being adjustable. The plates are disposed in such a manner that the slag or residue 4 placed onto the uppermost and first plate 3.1 reaches first the plate 3.2, which exhibits substantially the same incline, before falling onto the plate 3.3 lying underneath, this process being continued until, via plate 3.4, the slag or the residues have reached plate 3.5 from where they are discharged to the outside.

This transport of residues or slag occurs through vibrations generated by vibrators 5. On the opposite side of the housing 1, which is not visible in the drawing, there is disposed a second vibrator 5 that generates vibration energy with movement components in the direction of the plates 3.1 through 3.5 that are extending downward.

Through a suction pipe 6, gas is drawn by means of a fan that has not been illustrated herein, said gas entering at the upper side 7 of the housing and being thereby in communication with the site in the waste treatment plant or on the firing grid in the region of which there still is a lot of unconsumed oxygen. The slag is supplied on the side indicated at 7.

The fact that this gas still contains quite a lot of oxygen is advantageous since this gas passes through the mass flows of the residues falling downward in a cascade, thereby promoting another reaction leading to improved burnout of the slag. As an alternative or in addition thereto, ambient air may also be supplied through the front side 8 of the housing.

The gas flows 9 between the oblique plates serve for wind sieving, i.e., they entrain the fines. On its further course, the suction pipe labelled at 6 is connected to a cyclone and then to a filter so that the fine fraction entrained in the gas flow may be obtained and recirculated, together with the combustion air, to the waste combustion process.

Claims

1-11. (canceled)

12. A method of separating residues from a thermal waste treatment into at least one fine fraction and one coarse fraction by which the residues are evacuated from a waste treatment plant in a dry state and separated into at least two fractions, wherein the residues are subjected to vibrations and conveyed downward in cascades over at least one stage on paths and on freefall paths lying therein between and wherein, in the region of the freefall paths, the fine fraction is evacuated by a gas flow, the coarse fraction, except for the fine fraction evacuated by wind sieving, being conveyed along the cascade path.

13. The method as set forth in claim 12, wherein the paths are disposed obliquely.

14. The method as set forth in claim 12, wherein the residues are conveyed downward over several stages.

15. The method as set forth in claim 12, wherein the fine fraction is evacuated by a gas flow in the region of the conveying vibration as well.

16. The method as set forth in claim 12, wherein the gas flow runs transverse to the direction of fall.

17. The method as set forth in claim 12, wherein the gas flow runs in a direction opposite to the conveying vibration.

18. The method as set forth in claim 12, wherein the wind sieving occurs on freefall paths and between the paths of conveying vibration at an adjustable gas speed of 2 through 10 m/s, preferably of between 3 and 5 m/s.

19. The method as set forth in claim 12, wherein the gas flow is first supplied to a cyclone separator after wind sieving and then preferably subjected to a filtering process.

20. The method as set forth in claim 12, wherein the ambient air or gas used for wind sieving originates from a region of the waste treatment plant or waste incineration plant in which there is still a lot of unconsumed oxygen.

21. The method as set forth in claim 12, wherein the fine fraction separated through wind sieving is recirculated to thermal waste treatment.

22. The method as set forth in claim 12, wherein the wind sieving fumes are recirculated to the incineration plant.

23. The method as set forth in claim 12, wherein different flow velocities are adjusted between the discrete conveying plates.

24. An apparatus for separating residues from a thermal waste treatment into at least one fine fraction and one coarse fraction, comprising a housing (1) abutting on swinging elements (2), said housing having a plurality of diagonally offset plates (3.1-3.5) that are disposed one beneath the other and being equipped with means for generating a vibration component oriented in the direction of the plates (3.1-3.5) disposed diagonally offset downward.

25. The apparatus as set forth in claim 24, wherein the plates (3.1-3.5) are connected to the housing (1) by their side edges.

26. The apparatus as set forth in claim 25, wherein the plates (3.1-3.5) are connected to the housing (1) so that their inclination is adjustable.

27. The apparatus as set forth in claim 24, comprising at least one suction line provided on the side of the housing (1) confronting the evacuation side.

28. The apparatus as set forth in claim 24, comprising a preferably adjustable inlet opening for a gas adapted to be led between the plates (3.1-3.5) for wind sieving.

29. The apparatus as set forth in claim 24, comprising a supplying device for dry residues of the waste treatment plant.

30. The apparatus as set forth in claim 24, wherein a cyclone, and preferably a filter as well, are mounted in the suction path downstream of the housing (1).

31. The apparatus as set forth in claim 24, wherein an adjustable inlet for the gas serving for wind sieving is connected to a region of the waste treatment plant still containing lots of unconsumed oxygen.