LU85343A1 - METALLURGICAL VESSEL FOR MELTING METAL - Google Patents

Description

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Metallurgical vessel for molten metals

The invention relates to a metallurgical vessel for molten metals, in particular steelworks converters, with a plurality of gas-permeable stones or nozzles arranged in its wall, preferably its base, each stone or nozzle using a

Single supply line is connected to a common main supply line.

It is known (ZA Patent 81 8089) to apply gas-permeable stones provided in the bottom of a converter -10 for flushing purposes to the melt located in the converter by means of a gas, the gas flowing through the melt after emerging from the stone. Such stones can also be used for Heating the converter with natural gas.

15 A converter, the bottom of which is provided with nozzles for introducing a gas into the interior of the vessel, is known for example from DE-OS 23 46 087. In such a converter, a pressure control valve is provided in the main feed line for gas control. Since only the total amount of purging gas can be regulated, uneven gas leaks per stone or due to different states of the gas-permeable stones or nozzles, which can either be slagged, cracked or run behind by steel, can

25 nozzle result, because the gas always chooses the path of the least resistance. Furthermore, there is a risk that part of this stone may flake off in the event of an inadmissible increase in pressure on a blocked stone.

30th

The invention aims to avoid these disadvantages * and difficulties and has as its object to create a metallurgical vessel of the type described in the introduction, in which stone or nozzle damage

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* Avoided due to excessive pressure, in which there is the possibility of recognizing a defective stone or nozzle without interrupting operation and which further allows individual stones or nozzles to be supplied with gas differently according to a predetermined program.

This object is achieved in that each individual supply line is equipped with a gas flow meter, which is followed by a control valve 10 for controlling the flow rate.

A pressure limiting valve is expediently arranged downstream of the control valve, as a result of which a pressure increase is automatically prevented. To regulate the control valve 15, a control circuit is provided according to a preferred embodiment, the control variable of which is the flow rate through the individual inflow line, the control variable is a setpoint for the flow rate and the manipulated variable v is the control valve position.

20th

A quantity controller is advantageously provided for each stone or nozzle, the setpoint of which is determined by a total setpoint generator for all stones or nozzles and a single

Setpoint generator for each individual stone or nozzle is formed.

The invention is explained in more detail below with reference to the drawing, which shows in a schematic representation the regulation of an individual gas-permeable stone which is installed in a bottom of a converter.

1 with a schematically shown converter is designated, the steel jacket 2 is provided on the inside with a refractory lining 3. In the fireproof / «I - 3 - 4 V.

Lining 3 are installed for the purpose of supplying heating gas and / or purge gas, a plurality of gas-permeable stones 4, 4 ', 4 "... Each of the stones 4, 4', 4", ... is supplied by an individual-5 branching from a main feed line 5 guide line 6, 6 ", 6", ... supplied with gas, with a single supply line 6 for one of the stones 4 being illustrated in detail in the drawing.

> After branching off from the main feed line 5, a flow rate measuring device 7 is provided in the 10 individual feed line 6 for detecting the actual value X of the gas quantity flowing through the single feed line 6. A control valve 8 is arranged downstream of the flow meter 7 in the flow direction. Between this and the gas-15-permeable stone 4 branches off from the single feed line to the outside line 9, in which a pressure relief valve 10 is installed.

* A dotted line 11 is shown with dashed lines, to which two setpoints, W2 are entered by means of setpoint generators T2 and 13, etc. a total target value · the flow rate for all gas-permeable stones 4, 4 ', 4 ", ... arranged in the bottom of the converter 1 from a total target value transmitter 12 and an individual target value 25 for each of the individual feed lines 6 , 6 ', 6 ", ... connected gas-permeable stone 4, 4', 4", ... by means of an individual setpoint device 13.

The function of the facility is as follows: 30

The setpoint X of the flow rate determined by the flow rate measuring device 7 serves to regulate the position of the control valve 8, the manipulated variable Y output by the flow controller 11 regulating the control valve 8 being regulated as a function of the total setpoint and individual setpoint W2I becomes. The pressure relief valve 10 prevents / - ft y.

destruction of the gas-permeable stones if operated incorrectly.

In order, for example, to implement a specific rinsing program with different loading of the rinsing stones 4, 4 ', 4 ", ..., it is possible to use a process computer to control the setpoints depending on the process running in converter 1. There is = * the possibility, in the case of solid parts, of a flow rate that is too low for a gas-permeable stone 4, 4 ', 4 ", ... to determine this stone by means of a separate display. You can then interrupt the individual feed line 6, 6 ', 6 ", ... to this defective block 4, 4', 4", ...

15

Another advantage of the device described is the fact that the amount of gas per gas-permeable stone 4, 4 ', 4 ", ... can be kept constant regardless of the condition of the stone.

20th

The invention is not limited to the embodiment shown in the drawing, but can be modified in various ways. For example, instead of gas-permeable 25 porous stones, it is possible to “provide the metallurgical vessel with nozzles, through which nozzles gas can be introduced into the interior of the metallurgical vessel. An individual supply line leads to each nozzle, which is connected to a

Gas flow rate measuring device is equipped, which is followed by a 30 control valve · for controlling the flow rate.

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Claims (4)

1. Metallurgical vessel (1) for molten metals, in particular steel mill converters, with a plurality of gas-permeable stones (4, 4 ', 4 ", ...) or nozzles arranged in its wall, preferably its base, 5 each stone or nozzle is connected to a common main feed line (5) by means of an individual supply line (6, 6 ', 6 ", ...}, characterized in that each individual supply line (6, 6', 6", ...) is equipped with a gas flow rate measuring device ( 7) is permitted, which is followed by a control valve (8) for regulating the flow rate. 2. Metallurgical vessel according to claim 1, characterized in that the control valve (8) is a pressure relief valve 15 (10) downstream. 3. Metallurgical vessel according to claim 1 or 2, characterized in that a control circuit is provided for controlling the control valve (8), the controlled variable. 20 (X) the flow rate through the individual inflow line, the command variable is a setpoint (W ^, W2) for the flow rate and the manipulated variable (Y) the control! Valve position is. 25 ' 4. Metallurgical vessel according to claim 3, characterized in that a quantity controller (11) is provided for each stone or nozzle, the setpoint (W ^, W2) by a total setpoint generator (12) for all stones (4, 4 ' , 4 ", ...) or nozzles and a single setpoint generator (13) for each individual stone (4, 4 ', 4", ...) or nozzle is formed. fr ^ Αλλλχι