JPH0571879A - Device for heat treatment and/or gas permeation of granular substance - Google Patents

Abstract

PURPOSE: To make uniform the quality of product and to enhance production efficiency by reducing energy loss. CONSTITUTION: The heat treating and/or gas permeating unit for a granular substance 7 comprises a fire bed 1 for receiving the substance 7 to be treated, a suction box 2 disposed below the fire bed 1, and a gas impermeable supporting element 5 arranged substantially in the plane of the fire bed 1. In order to pass handling gas uniformly through the substance to be treated and to guarantee uniform quality over the entire cross-section thereof, a side wall 10 extending upward from the fire bed 1 is provided continuously to the outer fringe part 9 of the supporting element 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction box formed by a fire bed for receiving a substance to be treated, and a suction box wall portion arranged below the fire bed and extending below a side edge portion of the fire bed. And on the side edge of the fire bed, comprising a gas-impermeable support element located generally in the plane of the fire bed, drying and burning particulate raw materials used in particular in the steel industry and And / or a device for heat treatment and / or gas permeation of particulate material for sintering.

[0002]

2. Description of the Related Art Conventionally, devices of this type have been described in DE-C-563,859, DE-B-1,
006,163, DE-C-3,446,845,
There are known examples according to the respective publications of DE-B-1,758,983. ,

[0003]

A device of this type is
The sintering bed is realized as a bed belt, and the DE-C
It is known from Japanese Patent No. 563,859. In general, the following problems are encountered when processing particulate matter with a sintering machine. Bulk of most materials
Is associated with shrinkage due to heating during sintering and subsequent cooling. However, of course, as a function of the material composition of the bulk piles on the sintering bed, the shrinkage occurs three-dimensionally, with the horizontal shrinkage forming cracks in the sintered cake. The process is adversely affected due to the formation of crevices, especially for lateral restraints. The fissures that develop during the sintering process following the sintering front are the air needed for the combustion of the solid fuel (carbon component) in the bulk.
That is, it facilitates passage of the oxygen mixture.

The increased gas flow at the edges causes a progressive slip of the sintered surfaces of the edges with respect to the area near the center and, to a limited extent, the burn surface.
non-sintered material (unsint) for ngfront release
ered material) formation also occurs,
Or, due to the increased gas (mostly air) availability, the fuel burns out rapidly without the actual sintering taking place. The uneven combustion of the edge region and the central part prematurely increases the permeability of the edge region of the sintered mass, and the gas mixture supplied for the combustion of the fuel is of minimal resistance. The flow channels preferentially flow through the finished sinter at the edges, thereby further staggering the central zone and, thus, prematurely, resulting in undesirable cooling on the sinter bed.

Due to the above-mentioned consequences, the quality of the sintered mass becomes non-uniform and the completion of the sintering process is delayed. The energy of the fuel introduced is not fully utilized and a large part (15 to 20%) of the aspirated gas mixture must be carried without any benefit and with consumption,
Alternatively, the concentration of beneficial or harmful substances contained in the exhaust gas is also diminished, possibly resulting in inefficient subsequent gas treatment. Although some sintering machines have been made to solve these problems, none of the known sintering machines still operate satisfactorily with regard to the edge area.

According to the first-mentioned DE-C-563,859, unsuitable air is obtained by unfolding the fire belt, ie laterally following the sintering fire by a gas-impermeable support surface. Attempts have been made to avoid the (false air) part. However, this solution is only for very small bulk heights, ie about 13c.
Applicable to m bulk heights, it has been found that combustion problems occur and the quality of the sintering is severely degraded in the edge region with higher bulks. DE-B-1,0
Another attempt to solve the problems pointed out above by JP-A-06,163 has been known for a long time after publication of DE-C-563,859. According to this document, the proportion of inadequate air is to be reduced by the covering of the bulk body in the edge region provided above the bulk body. However, this solution does not result in a high-quality product in the edge area, since an accurate and confidential covering of the bulk is not possible.

A solution is known from DE-C-3,446,845, in which the sintering bed is replaced by a blind plate in the edge region. Especially in the case of the reconstruction of existing plants, this solution results in a significantly reduced efficiency of the blower due to the reduced fire surface. Until now, this type of energy loss has not been considered a burden, but today the situation has changed due to the recognition of the high value of energy. In DE-B-1,758,983 relating to a sintering device, a fire plate is arranged between lateral chain links. This chain link arranged in the suction box causes a reduction of the suction box cross-section and, consequently, a reduction in efficiency, which is known from the DE-C-
The device functions similarly to the device disclosed in Japanese Patent No. 3,446,845, and is accompanied by the same problem.

The present invention is intended to avoid these disadvantages and difficulties and aims to provide a device of the kind mentioned at the outset, whereby the edge area also has a larger throw-down. Height (dumping hei)
The material that is evenly penetrated by ght) and that is thrown down to the edge region exhibits the same quality as the material that is centrally located on the fire bed after treatment. In particular, the output of the device is increased by simultaneously reducing the specific consumption data-electrical energy of the blower and coke in the bulk-and by making the quality of the material to be processed uniform over the cross-section of the bulk. Can be realized.
According to the invention, this object is achieved, the device according to the invention comprising a side wall extending upwards from the fire bed, said side wall continuing to the outer edge of the support element.

[0009]

In order to solve the above problems, the present invention is directed to the heat treatment and / or gas permeation of particulate matter, in particular the fine particle raw materials used in the steel industry are dried and burned. Apparatus for causing and / or sintering, a firebox for receiving a substance to be treated, and a suction box arranged below the firebox and extending downwardly from a side edge of the firebox. In a device with a suction box formed by walls and a gas impermeable support element located generally in the plane of the fire bed, following the side edges of the fire bed, extending upward from the fire bed A side wall is provided, and the side wall continues to the outer edge portion of the support element.

Further, preferably, each of the supporting elements is fixed to a frame portion holding a fire bed, and the side wall is supported by the supporting element. further,
According to a preferred embodiment, the side walls are each fixed to a frame body flanged to a frame body holding the fire bed at a distance from the fire bed, and the support element is It is fitted between the side wall and loosely attached to the frame body.

Further, the end of the frame body holding portion for holding the fire bed extends above the frame body portion, is covered by the support element, and is fastened and fixed to those positions by pins or bolts. Is preferred. More preferably, the width of the support element is 10 cm to 35 cm.
Up to, the continuous side wall may be approximately twice as high as this. The width of the support element is 10 cm for small firebeds and low throwdown heights, up to 35 for wide sinterbeds and higher throwdown heights.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a sintering apparatus according to a first embodiment of the present invention, in which a sintering bed 1 is arranged below the sintering bed 1 and is directly connected to the sintering bed 1. The suction box 2 is formed by a suction box wall portion 4 extending downward from the side edge portion 3 of the sintering fire bed 1, and a suction ventilation device (not shown) is connected to the suction box 2. At each side edge 3 a support element 5 follows the sintering bed 1 and extends approximately in the same plane as the sintering bed 1 and is provided with a gas impermeable plate 6 on which the granular material to be treated is provided. 7, ie the material 7 to be treated,
It is placed at a throw-down height of 8 which is almost the same as that of the sintering fire bed 1.

A side wall 10 is provided on each outer edge 9 of the support element 5.
FolloWing, and extending laterally upwards, it supports the bulk material of the material 7 to be treated provided on the sintering bed 1 at least in the initial stages of the treatment. With the ongoing processing of the material 7, the shrinkage mentioned above and the resulting formation of the gaps 11 will occur in the side walls 10. According to the embodiment shown in FIG. 2, the sinter fire bed 1 is supported by a frame 12 surrounding it. Further, the frame body 12 holds the support element 5 outwardly in a cantilever state laterally beyond the frame body 12, and the outer edge portion 9 of the side wall extends upward from the surface of the sintered fire bed 1. 10 are fixed respectively. This support element 5
Both side wall 10 and side wall 10 may each be protected by thermal insulation.

An improved embodiment is shown in FIG.
According to this, the frame body holding portion 13 of the sintering fire bed 1 is supported on the flange 14 of the frame body 12 protruding outward. The side wall 10 is fixed to the flange 14 on a part 15 which is cantilevered beyond the support element 5 so that a distance A is created between the side wall 10 and the fire bed 1.
In the internal space thus formed, the support element 5 is fixed to the frame body 12 by means of pins or bolts 16 which penetrate the side wall 10. The sintering apparatus according to the present invention has an edge-effect during the passage of gas through a fire bed (especially also in a pellet combustion apparatus using a moving bed process) for economic or eco-environmental reasons. indu
Ced effects-e.g. non-uniform penetration of transparent bulk material due to edge transmission-should be avoided or at least reduced.

The device according to the invention is especially suitable for calcined sulfides (r
It is used in the steel industry to prepare particulate raw materials for use in blast furnaces, as well as in the sintering of raw materials, or in the manufacture of cement clinker. In the sintering apparatus according to the present invention, the sintering bed can have various modes such as a bed car and a bed ladle.

[0016]

As is apparent from the above description, according to the present invention, for the heat treatment and / or gas permeation of the granular material,
A device for drying, burning and / or sintering fine-grained raw materials, especially those used in the steel industry, with a fire bed for receiving the substance to be treated and below the bed. A suction box formed by a suction box wall extending downwardly from the side edge of the fire bed, and a gas impermeability located generally in the plane of the fire bed following the side edge of the fire bed. An apparatus including a supporting element is provided with a side wall extending upward from the fire bed, the side wall continuing to an outer edge portion of the supporting element.

Thus, without changing the blower, usually only by reconstructing the periphery of the plant itself, by making better use of the blower capacity for the original sintering process, an existing sintering plant is present. Production of 2
It can be increased to 0%, resulting in shorter and more compact plants if newly constructed. The existing blowers are available for the process in an optimum way, which leads to a more favorable air (gas) flow rate per ton of product. A higher degree of concentration of harmful and beneficial substances in the exhaust gas allows for a more efficient purification, i.e. cleaning, of the exhaust gas.

In particular, with a wide fire surface, lateral cantilever loads give rise to the static advantages (reduced bending, lighter structure) of the structure of the support element holding the fire bed. With a sinter belt, the reduction in the relationship of the lateral seal below the bed to the sinter mass between the sidewalls results in a factor of less than 1.0 (up to about 0.85 or less in a narrow belt), which is Advantages such as being accompanied by an additional reduction of undesired amounts of improper air.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an edge region of a sintering machine according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an edge region of a sintering machine according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of an edge region of a sintering machine according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Firebed 2 Suction Box 3 Side Edge 4 Suction Box Wall 7 Granular Material 9 Outer Edge 10 Sidewall

[Procedure amendment]

[Submission date] July 28, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Harald Fuyursyus Austria, Ah-4481 Asten, Butz Hengsyutraße No. 20 (72) Inventor Erwin Zwitztak Austria, A-4212 Neumarkt, Am Sonnenhang 4th

Claims (5)

[Claims] 1. A device for the heat treatment and / or gas permeation of a granular substance (7), in particular for drying, burning and / or sintering finely divided raw materials used in the steel industry. A fire bed (1) for receiving the substance to be treated (7) and a fire bed (1) arranged below the fire bed (1) and extending downward from a side edge (3) of the fire bed (1) Suction box (2) formed by suction box wall (4) and fire bed (1)
A gas impervious support element (5) arranged substantially in the plane of the fire bed (1) following the side edges of the fire bed (1), the side wall (10) extending upward from the fire bed (1). ) For the heat treatment and / or gas permeation of particulate matter, characterized in that this side wall (10) follows the outer edge (9) of the support element (5). 2. The support element (5) is fixed to a frame part (12) each holding a fire bed (1), and the side wall (10) is supported on the support element (5). The device according to claim 1, characterized in that it is present (FIG. 2). 3. A frame body portion (wherein the side wall (10) is flanged to a frame body (4) holding the fire bed (1) at a distance (A) from the fire bed (1), respectively. 12), the supporting element (5) is fitted between the fire bed (1) and the side wall (10), and the frame portion (1)
Device according to claim 1, characterized in that it is loosely attached to (2) (Fig. 3). 4. An end of a frame holding part (13) supporting the fire bed (1) extends above the frame part (12) and is covered by the support element (5), and a pin or Device according to claim 3, characterized in that it is fastened and fixed in its position by bolts (16). 5. The width of the support element (5) is 10c.
m to 35 cm, the continuous side wall (1
Device according to any of claims 1 to 4, characterized in that 0) is approximately twice as high as this.