DE3806861C1 - Transport installation for hot iron sponge - Google Patents

Abstract

In direct reduction plants of the state of the art, the hot-briquetting unit is arranged underneath the shaft furnace or free-standing at a distance from the furnace. In the first case, a considerable overall height is necessary. In the other case, filled transport skips closable on one side have hitherto been used, by means of which the iron sponge had to be transported in a plurality of transport steps to the briquetting press. The transport installation according to the invention has transport containers (1) which can be closed at the top and at the bottom and which are suspended in a frame structure (2) provided with running rollers (3). On an inclined path (5), the filled transport containers (1) run upwards to the hot-briquetting unit, and the empty transport containers (1) run downwards for filling with iron sponge. Fields of application are direct reduction plants with hot briquetting of iron sponge and with cold discharge of the iron sponge. <IMAGE>

Description

The invention relates to a plant for the transport of hot sponge iron from a direct reduction plant to the side of the shaft furnace Hot briquetting system by means of transport containers that after filling with an elevator winch over a Sloping path on the briquetting hopper put on, emptied and then back under the Discharge device for the shaft furnace, consisting of Discharge lock, downpipes, insulated Intermediate bunkers with shut-off valves, retracted will.

Sponge iron is produced by direct reduction of ores receive. So piece ore are known by known methods or pellets placed in a shaft furnace. It takes place there a counter-current reduction of the ores with gases takes place, with the conversion of hydrocarbons Oxygen carriers can be obtained. The hot generated Sponge iron is then hot briquetted fed.

From "Hut, paperback for ironworkers", 5. Aufl., 1961, p. 362, is a ski lift (picture 20) for Known inspection of a shaft furnace in which Transport container (skip) by means of an elevator winch their filling via an inclined path to one Feed hopper transported, emptied there and again moved back to the starting position for filling will.

From DE-PS 22 08 382 is a device for that Discharge of sponge iron known. There is one Shaft furnace discharge device one or more Drop chutes connected. At every chute  an intermediate bunker, to the intermediate bunker Filling funnel with compensator for connection to a Transport container connected. The transport container has only one upper filling opening.

The sponge iron is in the transport container Further processing fed.

Located in a direct reduction plant the hot briquetting system is about 100 m from Shaft furnace removed. Here are the top lockable transport container on vehicles for Briquetting plant driven, picked up by a crane, placed above the briquette press feed hopper and dumped into the bunker to empty the contents. The container opening is directed downwards.

On the other hand, it is known to press the Briquetting the hot sponge iron just below to arrange the shaft furnace. In this case, the Overall system has a significantly greater overall height, namely about 20 m.

In the event that in the direct reduction plant first driven with cold discharge of sponge iron and the hot briquetting only at a later time When to install, must be done from the start the entire height can be taken into account.

The object of the invention is to provide a transport system for to create hot sponge iron that is designed that the direct reduction system is practically unaffected can be set up by downstream systems. It must be ensured that the  Filling device below the shaft furnace, in the the transport container is integrated, after corresponding adjustments for both the filling of cold as well as for filling and transporting hot sponge iron.

This object is achieved in accordance with the invention solved as stated in the main claim. Further advantageous embodiments of the invention Features are the subject of the subclaims.

The system according to the invention makes it possible To create direct reduction plant, to which z. B. only a hot briquetting system at a later date to be built. The influence of the briquetting system on the construction of the direct reduction plant significantly reduced. So the system can Cold discharge of sponge iron can be used in the way that the one with upper and lower opening provided transport containers for this mode of operation as stationary flow container is used and the cold sponge iron on one below Transport container arranged continuous conveyor for Further use is transported.

Becomes the direct reduction system for hot discharge operated, the transport system for the Transport of the containers to the hot briquetting system used will. The corresponding concept enables one safe, unproblematic transport by means of a known incline to the level of Briquetting system, with any intermediate funding (Moving the transport container vehicle, Crane transport) and the tilting of the transport container for the purpose of emptying.

An embodiment of the invention is shown below explained in more detail using the schematic drawing.

In this single patent figure is a transport system shown for sponge iron.

Under the shaft furnace ( 15 ) of a direct reduction system, the discharge of which is shown for hot sponge iron, there is a discharge lock ( 14 ) with several downpipes, to which insulated intermediate bunkers ( 13 ) are connected. The graphic representation only shows the parts of the system visible in the foreground. It is therefore understood that a parallel system is not visible behind it. This is necessary to enable continuous discharge from the shaft furnace.

Downpipes provided with shut-off fittings ( 12 ) are arranged below the intermediate bunker ( 13 ). In each of these downpipes a compensator ( 9 ) is installed, at the lower end of which a downpipe piece with a connecting flange ( 8 ) with an inclined flange surface is arranged for connection to the transport container ( 1 ). The compensator ( 9 ) is provided with a (not shown) hydraulic or pneumatic vertical adjustment device, which serves the purpose of placing the pipe section with the connecting flange ( 8 ) on the opening flange of the transport container ( 1 ) and pressing it airtight.

The upper opening and the lower opening of the transport container are with closure members, for. B. flap locks, ( 6, 7 ) equipped. The transport container ( 1 ) is thermally insulated ( 4 ) and is provided with a gas connection (not shown) via which inert purging gas can be introduced to prevent reoxidation.

The transport container ( 1 ) is suspended in a frame structure ( 2 ) which is provided with rollers ( 3 ). On the rails of the inclined path ( 5 ), the transport container filled with sponge iron is pulled up to a level above the hot briquetting system using a winch device ( 19 ).

When the transport container (1) has reached the end position over the Brikettiergut-feed hopper (11), the vertically adjustable compensator (10) is pressed the down pipe to the connecting flange (8) against the lower opening flange of the transport container by means and the lower shut-off valve (7 ) opened so that the hot iron sludge can flow into the bunker ( 11 ).

The bunker ( 11 ) serves as a buffer container, ie its capacity is so large that a continuous briquetting operation is guaranteed regardless of the discontinuous loading of the bunker.

The hot briquetting presses (roller presses 16 ) are located under the briquette feed hopper ( 11 ). The presses ( 16 ) discharge the sponge iron in briquette form in screening, cooling and conveying systems ( 17 ).

The arrangement of the hot briquetting system shown brings the better as an additional advantage Accessibility for repair and maintenance purposes.  

As soon as the transport container ( 1 ) located below the shaft furnace ( 15 ) is filled with hot sponge iron, the emptying process of the transport container ( 1 ) located above the briquette feed hopper ( 11 ) is usually ended. While the filled container is being pulled up, the empty transport container moves downwards on parallel tracks on the inclined path.

A continuous conveyor ( 18 ) is shown below the transport container, which is located on the shaft furnace side. This conveyor is used to transport cold iron sponge, ie in the event that the direct reduction system is initially not or is not yet equipped with a hot briquetting system. To discharge cold sponge iron, the lower part of the shaft furnace must be set up for the introduction of cooling gas.

The one shown in the left half of the patent figure Plant parts are therefore used for the removal of cold sponge iron used, the Transport container is used as a flow container.

In the course of the construction of a hot briquetting plant the shaft furnace converted to hot discharge and the Sponge iron transport system to Hot briquetting system added.

Claims (3)

1. System for transporting hot sponge iron from a direct reduction system to the hot briquetting system arranged on the side of the shaft furnace by means of transport containers which, after being filled with an elevator winch, are placed on the briquetting feed bunker via an inclined path, emptied and then again under the discharge device of the shaft furnace, consisting of discharge lock, downpipes, Insulated intermediate bunkers with shut-off valves can be retracted, characterized in that the transport containers ( 1 ) provided with thermal insulation ( 4 ) can be locked ( 6, 7 ) at the top and bottom and that the transfer device for the transport containers ( 1 ) with connecting flanges ( 8 ) and Compensators ( 9, 10 ) is formed. 2. Plant for the transport of hot sponge iron according to claim 1, characterized in that the transport container ( 1 ) are provided with a device for supplying inert gas. 3. Plant for the transport of hot sponge iron according to claim 1, characterized in that the compensators ( 9, 10 ) below the intermediate bunker ( 13 ) and above the briquetting feed bunker ( 11 ) are provided with a vertical adjustment device.