DE1458916A1 - Hearth furnace with regenerative air preheating for the production of liquid steel and process for its operation - Google Patents

Description

DR. F. EBERHARD. ^ """" V * - r 'V *' ¹ '21

PATENT ADVOCATE

PZ 2805

Patent application

»Hearth furnace with regenerative air preheating for the production of liquid steel and the process for its operation» ¹

Applicant »Rheinische Stahlwerke» Essen,

As is well known, the course over time and the result are more metallurgical Reactions between the metal bath and slag depend to a large extent on the relative movement of the two involved Phases »It has already been proposed in principle to accelerate the reaction process by letting the slag over the resting bath is moved away «Hach theoretical considerations can be expected either - with an unchanged amount of slag compared to the usual Siemens-Martin process Enrichment of the slag increased by approximately two orders of magnitude or - with unchanged solute enrichment one Slag amount reduced by about an order of magnitude · Furnaces suitable for carrying out the described process are but not yet known

The invention is based on the well-known Siemens-Martin furnace, which has two opposing burner heads with gas and / or air puffs and the one with regenerative chambers for preheating Gas and / or air and ducts equipped with reversing valves is*

Based on the discussed prior art, the invention has set itself the task of creating a hearth furnace that enables the slag to be moved continuously over the stationary steel bath

The invention relates to and presupposes, as is known, a hearth furnace with regenerative air preheating to produce liquid steel. The hearth furnace according to the invention is characterized by the familiar opposed to the fact that there is an oven on only one side of the oven.

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head for the air supply is arranged that further a feed device for slag formers in the area of the furnace head opens into the hearth and that the slag drains off the opposite, gas-extracting side

In detail, the hearth furnace according to the invention can be in various Be further developed »Basically, the amount of movement (thrust) required for the port movement of the slag can be achieved by arranging one or more front burners charged with cold gas or oil in the furnace head. The same goal can, however, be achieved in a more perfect way if according to a further essential characteristic the invention of the hearth furnace is designed such that in the vault of the furnace one or more, perpendicular to the bath Oxygen burners are installed and the preheated air with tauter flow that hits the slag as flat as possible is introduced. «The amount of movement imparted to the slag can be easily regulated and easily adjusted to the required Set value * In addition, the preheated air removes the unburned fuel gas from the burner cone sucks in and burns directly above the bath · In addition, this type of heating has the advantage that through the. intensive heat transfer both in the burner cone and in the zone that reacts with the preheated air the slag builder happens very quicklyo that favors significantly the desired increased effectiveness of the slag. The slag is expediently withdrawn from the steel bath by that on the gas-extracting furnace side a designed as a dam Slag overflow limits the hob. The hearth furnace has two regenerative chambers, the exhaust gas supply of which is alternately blocked in a known manner »These slides are in the head of the Eegenerativkammer arranged so that the exhaust gas in the direction of gravity flows into the chambers. On the exhaust side of the hearth there is a slag chamber open at the bottom to which a movable pan is connected to take up the slag «

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The invention also relates to a method for operating the The hearth furnace described above consists, according to the invention, in the fact that, after the insert has liquefied, the slag formers are continuously fed to the hearth and that the slag formed by a tight air flow in the furnace over the The bath is moved continuously and runs over the slag overflow and the bottom slag chamber into the slag pan

The invention is explained in more detail below with an exemplary embodiment based on the drawings

Pig · 1 the hearth furnace in vertical sonicity,

Pig 2 shows a vertical section of the furnace according to FIG. 1 along its length the straight line II-II,

3 shows a horizontal section along the straight line IH-III from Fig · 1 ·

A furnace head 1 is arranged on one side of the furnace. 3 unite »and depending on the position of the two air shut-off valves 4 · are fed with preheated air from one of the two regenerative chambers 5. In the area of the furnace head a feed device 6 for slag formers is arranged, which opens into the hearth space 7 above the steel bath. On the The opposite, gas-extracting furnace side separates the slag from the steel bath by using a dam designed as a dam Slag overflow θ runs into the bottom slag chamber 9 and from there into the movable slag pan 10 reaches, which holds the slag accumulation of about 20 to 40 melts · The hot exhaust gas is via the exhaust duct 11 and its two branches 12 each to one of the two regenerative chambers 5 · The exhaust gate valves 13 are in the head of the Regenerative chamber arranged in such a way that the hot exhaust gas flows through the lattice work of the chambers vertically from top to bottom The branch 14 with control valve directs excess exhaust gas

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In the plane of symmetry of the furnace, three oil-oxygen burners 15 are built into the vault which brush the cones of the burners 15 and lead to brook burns there »

The dam of the slag overflow 8 is subject to strong "wear and tear" The required precise measurement requires appropriate care and selection of the refractory material Example · * the overflow 8 is laid in the outer wall of the furnace so that the slag drains into the open air and from there into the slag pot · In this case, the exhaust gas from the furnace room must also be routed through two exhaust ducts, so that in the middle for This overflow into the open space is created · It can also be recommended to make the exhaust duct 11 for the aggressive exhaust gas shorter and to lengthen the drafts accordingly by arranging the regenerative chambers 5 near the exhaust gas side of the furnace _e

Claims t

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Claims (1)

H58916 Claims 8 1e hearth furnace with regenerative air preheating to generate Liquid steel, characterized in that there is only one furnace head (1) for the air supply on one furnace side is arranged that in the area of the furnace head (1) a feed device (6) for slag forming in the Oven space (7) opens and that the slag runs off on the opposite, gas-extracting furnace side. 2 «hearth furnace according to claim 1, characterized in that in the furnace head (1) one or more with cold gas or oil-fed forehead burners are arranged » 3 »hearth furnace according to claim 1, characterized in that one or more oxygen burners are located in the vault of the furnace (15) are built in « 4 · hearth furnace according to one of claims 1 to 3 * d by marked »that a slag overflow (8) designed as a dam delimits the hearth» β hearth furnace according to one of claims 1 to 4 _B, characterized in that the exhaust gas flows in the direction of gravity in the area of the slide (13) alternately blocking the exhaust gas feed to the regenerative chambers (5) » 6 »hearth furnace according to one of claims 1 to 5 | marked through a slag chamber (9) on the exhaust gas side, open at the bottom, to which a movable slag pan is attached (10) connects » 7 · method of operating the hearth furnace according to one or mehrerS of the preceding claims, characterized in 'that the slag are continuously fed to the Herdraun (7) after liquefaction of the insert, and in that the slag formed by a _λ in the furnace 1Έ / 0406 ORiGiNAL fNSPECTED ν ;: Tightly directed air and / or grass guidance moved over the bathroom is and over the Schiackenüberlauf (8) in the Slag pan (10) runs in * ORiGiNAL INSPECTED 909818/0406