DD295905A5

DD295905A5 - DEVICE FOR LOADING A SHAFY

Info

Publication number: DD295905A5
Application number: DD34205590A
Authority: DD
Inventors: Frank Noack; Hans U Feustel; Joachim Mallon; Michael Schaaf
Original assignee: Buerogemeinschaft Ingitec,De
Priority date: 1990-06-26
Filing date: 1990-06-26
Publication date: 1991-11-14

Abstract

Die Erfindung ist in Betrieben der metallurgischen Industrie anwendbar und betrifft eine Vorrichtung zum Beschicken eines Schachtofens, insbesondere eines kokslosen, gasgefeuerten Kupolofens, die aufgabengemaesz den Eintrag von feinkoernigen Anhaftungen und hoeherwertigen Eisenoxiden des Einsatzmaterials in den Ofen verhindert. Erreicht wird dies dadurch, dasz zwischen dem Schraegaufzug und einer festliegenden Einwurfschraege der Gattierungsoeffnung des Ofenschachtes eine Ruettelrinne und ofenseitig angrenzend ein vertikal verlaufender, abgedeckter Laengsspalt, an dem ein Unterdruck anliegt, angeordnet sind. Vorteilhafterweise garantiert das durch die Beschickungsvorrichtung gesaeuberte Einsatzmaterial einen ungestoerten Schmelzprozesz mit verbesserten Waermeuebergangsbedingungen vom Ofengas auf das Einsatzmaterial, wodurch der CO-Ausstosz sinkt und die Umweltbelastungen reduziert werden.{Beschickungsvorrichtung; Schachtofen; Schraegaufzug; Ruettelrinne; Einwurfschraege; abgedeckter Laengsspalt}The invention is applicable to operations in the metallurgical industry and relates to a device for feeding a shaft furnace, in particular a coke-free, gas-fired cupola, which according to the object prevents the entry of fine-grained deposits and higher-grade iron oxides of the feedstock into the furnace. This is achieved by the fact that between the Schraegaufzug and a fixed Einwurfschraege the Gattierungsoeffnung the furnace shaft a reed chute and the furnace side adjacent a vertically extending, covered Laengsspalt, to which a negative pressure is applied, are arranged. Advantageously, the feed scrubbed by the feeder guarantees an uninterrupted melting process with improved heat transfer conditions from the furnace gas to the feed, thereby reducing CO emissions and reducing environmental impact. {Feeder; Shaft furnace; incline elevator; vibrating; Einwurfschraege; covered longitudinal gap}

Description

des Abdeckelementes in einer vertikalen Ebene liegen, entsteht ein Öffnungsspalt S, der einerseits ein Absaugen des metallischen Einsatzmaterials in den Spalt verhindert und andererseits die feinkörnigen Anhaftungen und Eisenoxide vollständig absaugt. Der von der Rüttelrinne erzeugte Lärm wird von der Einhausung, die schallgeschützt ist, gedämpft. Danach rutscht das von den feinkörnigen Anhaftungen und Eisenoxiden getrennte Einsatzmaterial über die festliegende Einwurfschräge kontinuierlich in den Ofenschacht und bildet dort die erforderliche, strukturmäßig horizontal und vertikal sehr gleichmäßig und locker aufgebaute symmetrische Schüttsäule. Die Vorteile der Beschickungsvorrichtung bestehen darin, daß das gesäuberte Einsatzmaterial einen ungestörten Schmelzprozeß mit verbesserten Wärmeübergangsbedingungen von Ofengas auf das Einsatzmaterial ermöglicht, somit der СО-Ausstoß sinkt und die Umweltbelastungen reduziert werden.of the cover in a vertical plane, creates an opening gap S, on the one hand prevents aspiration of the metallic feed into the gap and on the other hand completely sucks the fine-grained adhesions and iron oxides. The noise generated by the vibrating channel is damped by the enclosure, which is soundproofed. Thereafter, the separate from the fine-grained adhesions and iron oxide feed over the fixed insertion slope continuously slides into the furnace shaft and forms the required, structurally horizontally and vertically very evenly and loosely structured symmetrical Schüttsäule. The advantages of the feeder are that the cleaned feed permits an undisturbed melting process with improved heat transfer conditions of furnace gas to the feedstock, thus reducing the CO emissions and reducing environmental impact.

Ausführungsbeispielembodiment

Die Erfindung soll an einem Beispiel näher erläutert werden. Hierzu zeigt die zugehörige Zeichnung einen Teil eines Schachtofens mit angeordneter Beschickungsvorrichtung im Schnitt.The invention will be explained in more detail by way of example. For this purpose, the accompanying drawing shows a part of a shaft furnace with arranged loading device in section.

Es ist dargestellt, daß zwischen dem Schrägaufzug 1 und einer festliegenden Einwurfschräge 5 der Gattierungsöffnung 7 des Ofenschachtes 8 eine Rüttelrinne 3 und ofenseitig angrenzend ein vertikal verlaufender, abgedeckter Längsspalt 4 angeordnet sind, wobei das ofenseitige Ende der Rüttelrinne 3, die freien Enden der Einwurfschräge 5 und des Abdeckelementes 9 in einer vertikalen Ebene liegen.It is shown that between the inclined elevator 1 and a fixed insertion bevel 5 of the gate opening 7 of the furnace shaft 8 a vibrating channel 3 and furnace side adjacent a vertically extending, covered longitudinal gap 4 are arranged, wherein the furnace side end of the vibrating channel 3, the free ends of the insertion bevel. 5 and the cover 9 lie in a vertical plane.

Weiterhin hat die Rüttelrinne 3 eine Einhausung 2 mit einem Absaugstutzen 6. Zum Beschicken eines Schachtofens wird das im Sturzkübel 10 gelagerte Einsatzmaterial mit einem Schrägaufzug 1 über die Rüttelrinne 3 transportiert und auf diese abgekippt.Furthermore, the vibrating channel 3 has a housing 2 with a suction nozzle 6. For loading a shaft furnace, the stored in the tumbler 10 feedstock is transported with an inclined elevator 1 on the vibrating channel 3 and dumped on this.

Jetzt bewegt sich das auf der Rüttelrinne 3 liegende Einsatzmaterial in Richtung Gattierungsöffnung 7, wobei der dabei entstehende Staub aus der staubdichten und schallgedämpften Einhausung 2 durch den Absaugstutzen 6 in die Entstaubung des Schachtofens gesaugt wird. Beim Passieren des abgedeckten Längsspaltes 4 werden die feinkörnigen Anhaftungen und Eisenoxide vom Einsatzmaterial durch die Wirkung des am Längsspalt 4 anliegenden Unterdruckes außerhalb des Schachtofens getrennt, so daß nur gesäubertes Einsatzmaterial über die festliegende Einwurfschräge 5 der Gattierungsöffnung 7 eingetragen wird.Now the feed material lying on the vibrating channel 3 moves in the direction of the cooking opening 7, wherein the resulting dust from the dust-tight and soundproof housing 2 is sucked through the suction nozzle 6 into the dedusting of the shaft furnace. When passing through the covered longitudinal gap 4, the fine-grained adhesions and iron oxides are separated from the feed material by the action of the voltage applied to the longitudinal gap 4 negative pressure outside the shaft furnace, so that only cleaned feed on the fixed insertion slope 5 of the gate opening 7 is registered.

Durch diese Art der Beschickung sinkt der СО-Ausstoß während der Beschickungsphase auf < 0,1 Vol.-%.By this type of feed, the CO output during the feed phase drops to <0.1% by volume.

Claims

1. A device for feeding a shaft furnace, in particular a coke-free, gas-fired cupola, consisting of an inclined elevator with a tiltable tumbler, characterized in that between the inclined elevator (1 ) and a fixed insertion slope (5) of the shutter opening (7) of the furnace shaft (8 ) a vibrating transport element (3), for example, a vibrating channel and the furnace side adjacent a vertically extending, covered longitudinal gap (4) are arranged.

2. Device for feeding according to claim 1, characterized in that the furnace-side end of the vibrating channel (3), the free ends of the insertion slope (5) and the cover element (9) lie in a vertical plane.

3. Device for feeding according to claim 1, characterized in that the vibrating channel (3) has an enclosure (2) with a Absaugstützen (6).

For this 1 sheet drawings

Field of application of the invention

The invention relates to a device for feeding a shaft furnace, in particular a cokeless, gas-heated cupola, in operations of the metallurgical industry.

Characteristic of the known state of the art

It is known to introduce the feedstock for a shaft furnace by an inclined elevator with a tiltable tumble bucket in a laterally arranged on preheating and melting shaft shutter opening. The disadvantage is that this type of feed can create a non-uniform distributed over the cross section of the preheating and melting shaft bulk cone of the feed. Thus, it is not possible to ensure symmetrical gasification with hot furnace gases which is necessary for the uniform preheating and melting of the feedstock. A uniform distribution of the feedstock is known to be secured by, for example, the installation of manifolds. So in SU-PS 389376 a device for closing the coating opening of a cupola, which has arranged for the distribution of the feedstock in the furnace distribution elements shown. The device here constitutes a flap which can be used as a coating element for the feed material. The flap is connected to a drive and is rotatable about the horizontal axis, whereby the feed material is conveyed outside the furnace with a conveyor belt to the flap, then by turning the flap into the oven slips and is evenly distributed by the distributor elements. The flap here has to fulfill the task of loading and closing and is therefore applicable to pressure-tight metallurgical furnaces. However, it is also disadvantageous that fine-grained adhesions, such as sand or molding residues, and higher-grade iron oxides are introduced into the furnace with the metallurgical feedstock. These cause an increase in the viscosity of the resulting slag in the oven, which in turn can not flow unhindered into the oven, thereby increasing the residence time of the liquid iron in the support grid area of, for example, gas-fired cupolas. This leads to a bulkhead compaction over the support grid and results in an increase of the furnace pressure. Thus, the thermal engineering and melting technological processes are disturbed. This means that the furnace is unstable, the gassing gases do not completely burn and an increased CO emissions and dust pollute the environment.

Object of the invention

The aim of the invention is to reduce the environmental impact arising when operating a shaft furnace.

Explanation of the essence of the invention

The invention has for its object to develop a device for feeding a shaft furnace, in particular a coke-free, gas-fired cupola, which prevents the entry of fine-grained adhesions and higher-grade iron oxides, which are always present in the feed in the oven.

This is achieved in that a vibrating transport element, such as a Rüttelrinne, and the furnace side adjacent a vertically extending, covered longitudinal gap are arranged between the inclined elevator and a fixed Einwurfschräge the Gattierungsöffnung the furnace shaft, wherein the furnace side end of the vibrating channel, the free ends of the insertion slope and of the cover lie in a vertical plane. Furthermore, the vibrating channel has an enclosure with a suction. For loading a shaft furnace, the feed material lying in the drafts bucket is moved by means of an inclined lift to the vibrating trough and tipped onto it. During further transport of the feed to the chamfer of the gate opening the resulting dust, the fine-grained adhesions and iron oxides from the feed through the coupled with a dedusting housing and through the opening gap S of the vertically extending, covered longitudinal gap, where a negative pressure is applied, sucked , This is possible because the vibration located on the feed fine-grained adhesions and iron oxides are dissolved and settle at the bottom of the vibrating means of transport. Since the furnace end of the vibrating trough and the free ends of the insertion slope and