JP3967380B2 - Incineration plant especially for incineration of waste - Google Patents

Abstract

In an incineration plant, especially for incinerating waste, of the kind comprising: a) an incineration grate (2) adapted to convey the material being incinerated in the forward direction; and b) an after-treatment (5) for processing the solid products of combustion and possible incombusted parts of said material leaving said incineration grate (2), the main novel feature is c) an active conveyor (3), the conveying direction of which runs transversely to the direction of conveying of said incineration grate (2), adapted to convey said solid products of combustion and possible incombusted parts from said incineration grate (2) directly to the after-treatment unit (5), the width of said conveyor (3) preferably being substantially less than the width of said incineration grate (2).

Description

TECHNICAL FIELD The present invention relates to an incineration plant of the type described in the preamble of claim 1.
BACKGROUND ART DK-B-154 452 (corresponding to EP-68 319) belonging to the present applicant discloses a plant of this kind, in which the plant is inclined. The chute connects the rotary kiln to the exit end of the incineration grate, and through this chute, the waste is not yet incinerated, but simply a pre-dried part is dropped into the rotary kiln, where the waste is pure. Incinerated to form a clean aseptic slag.
Similarly, a more recent method DK-B1-168245 belonging to the present applicant (corresponding to US-5 385 104) discloses a similar method and plant, in which The rotary kiln is placed immediately downstream of the incinerator with a stepped grate, and a glassy product is produced in the rotary kiln, from this document, perhaps most clearly from its summary It is clear that the solid combustion products produced by incineration are converted into glassy lumps, from which salts and heavy metals are not eluted.
Thus, the problem solved by the plant described in this document is that the aftertreatment of these solid combustion products is done in such a way that it can be disposed or possibly recycled without impacting the environment.
However, the described solution is problematic in itself because the diameter of the feed end of the rotary kiln is necessarily larger than the width of the incineration grate, and the latter is also critical to the capacity of the incineration plant.
However, for technical reasons, it is difficult to construct a rotary kiln with a large diameter, partly because of the prominent elliptical deformation of the rotary kiln, such a kiln. The wedge-shaped refractory brick used for the inner lining of the lining is held in place in the kiln by a so-called “dome function”, which is the upper limit of the diameter of such a lining, ie the wedge angle of the refractory brick. This is for determining the lower limit of. Thus, the rotary kiln determines the upper limit of the incineration capacity of the plant.
Disclosure of the invention An object of the present invention is to provide an incineration plant of the kind described in the preamble of claim 1. According to this plant, the above problems are solved and the diameter of the rotary kiln does not limit the width of the plant's incineration grate and therefore does not limit its capacity.
This object is achieved by the features described in the characterizing part of claim 1. This feature is the result of a solid combustion product discharged from the incineration grate that may be relatively wide and the unburned portion of the material to be incinerated that may be relatively narrow due to the above structural limitations. It is possible to transfer directly to the kiln feed so that the sensible and latent heat in the material can be fully utilized to vitrify the slag and ash in the aftertreatment equipment.
Other embodiments of the combustion plant according to the invention are described in the claims 2 to 5 although the effect is evident from the detailed part of the description below.
[Brief description of the drawings]
In the detailed part of the description below, it will be explained in more detail with reference to an embodiment of the incineration plant of the invention shown in the drawing. FIG. 1 is a side view showing a partial cross section of the first embodiment. FIG. 2 is a schematic plan view of the second embodiment.
Description of the preferred embodiment The incineration plant shown in Fig. 1 has a furnace wall 1 with a stepped incineration grate in between, the lowest grate section 2 of the applicant. GB-B-2 120 764, and consists of a grate arranged in fixed alternating rows. A conveyor 3 having the same type of grate section as that of the grate section 2 but having a small number of grate blocks is placed at a position lower than the lowermost end of the grate section 2. The repetitive grate block of the grate 3 is operated by the motion mechanism 4. The grate 3 leads to the charging port of the post-treatment device in the shape of the rotary kiln 5, the rotary shaft 6 is inclined downward toward the downstream, the outlet end 7 is narrowed conically inward, and the rotary shaft 6 It extends over the shaft 8 to recover liquid vitrified slab and ash flowing down from the outlet end 7 of the kiln 5. A burner 9 is placed in the wall of the shaft 8 so as to face the outlet end 7 of the rotary kiln 5 in order to control the temperature of the vitrified mass. Hot flue gas from the furnace space and / or air for combustion is directed to the outlet end 7 of the rotary kiln 5 via a slab shaft 8 by a suitable duct (not shown).
The incineration plant shown in FIG. 1 operates as follows.
Solid combustion products discharged from the lowest end of the grate section 2 and possible unburned fuel components fall onto the grate 3 and are transferred to the rotary kiln 5 by the grate 3 and back flow with the combustion gas. In the direction, possibly further combusted, transferred to the outlet end 7 of the rotary kiln 5 which narrows inwardly in a conical shape, optionally heated by the flame from the burner 9, and vitrified mass The temperature is controlled to be temporarily held in the conical portion inside the outlet end 7 and then dropped onto the shaft 8.
If it is desirable to place the rotary kiln on the extension of the furnace grate in consideration of space, this can be done by orienting the grate laterally as shown in FIG. Downstream of the combustion grate 11, there are three conveyors or grates 12, 13, and 14. Of these, the two conveyors 12 and 14 respectively placed on the right and left of the kiln transport the material from the incineration grate 11 toward the conveyor 13 on the extension of the incineration grate 11 for incineration. The material from the grate 11 and the two lateral conveyors 12 and 14 is collected and discharged to a rotary kiln or post-processing device 15.
It will be appreciated that the incineration plant shown and described can be modified in several ways within the scope of the claims. Therefore, the grate 3 can be replaced with, for example, an endless conveyor.
Parts list 1 Furnace wall 2 Lower part of grate 3 Conveyor or grate 4 Motion mechanism 5 Rotary kiln 6 Rotary shaft 7 Exit end 8 Shaft 9 Burner 11 Incineration grate 12 Conveyor or grate 13 Conveyor or grate 14 Conveyor or fire Grid 15 Rotary kiln

Claims (4)

Incineration grate (2), which is designed to transport material that is loaded and incinerated on the incineration grate, to burn incompletely burned material and convert meltable material into slag, In an incineration plant having a rotary kiln (5) in which heat and oxygen are supplied to the material,
A conveyor device (3) having an inlet side extending along an outlet side of the incineration grate (2) and having an outlet side not larger than a charging port of the rotary kiln (5) is provided. A single conveyor (3) extending in a direction transverse to the conveying direction of the incineration grate (2) and along the outlet side of the incineration grate (2) and extending directly into the charging port of the rotary kiln (5) ) Incineration plant. An incineration grate (11) adapted to transport material that is loaded and incinerated on an incineration grate, and to burn incompletely burned material and convert meltable material into slag, In an incineration plant having a rotary kiln (15) in which heat and oxygen are supplied to the material,
A conveyor device (12, 13, 14) having an inlet side extending along an outlet side of the incineration grate (11) and having an outlet side not larger than a charging port of the rotary kiln (15);
The conveyor device extends along a part of the outlet side of the incineration grate (11) and directly extends into the charging port of the rotary kiln (15), and the incineration grate (11 ) Extending transversely to the conveying direction and along the remaining part of the incinerator grate (11) on the outlet side, between the inlet and outlet of the first conveyor (13). An incineration plant comprising one or two other conveyors (12, 14) supplying the material to a conveyor (13). The incineration plant according to claim 1 or 2, wherein the incineration grate (2; 11) comprises at least two incineration grate placed side by side. The first claim, characterized in that at least one of the conveyors (3; 12, 13, 14) is in the form of an incineration grate adapted to transport the material placed thereon. Incineration plant of a 2nd term or a 3rd term.

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