WO2011095377A1 - Device for recording at least one measured value on a furnace, and furnace - Google Patents

Abstract

The invention relates to a device for recording at least one measured value on a furnace (1), in particular an arc furnace, wherein the device comprises at least the following: at least one apparatus (3) for injecting at least one gas into the furnace (1); at least one measurement unit (10) for recording the at least one measured value; and at least one assembly (8) for positioning the at least one measurement unit (10) opposite a cold end of the at least one apparatus (3) for injecting at least one gas into the furnace (1), wherein the at least one assembly (8) comprises at least one positioning unit (8a) and at least one replacement unit (8b), which is configured to make a detachable connection to the at least one positioning unit (8a) and wherein the at least one positioning unit (8a) is arranged on the at least one apparatus (3) for injecting at least one gas into the furnace (1) and the at least one replacement unit (8b) is configured to receive at least one measurement head (10b) of the at least one measurement unit (10). The invention further relates to a furnace (1) having at least one such device.

Description

description

Device for detecting at least one measured variable on an oven, and oven

The invention relates to a device for detecting at least one measured quantity to a furnace, the apparatus comprising at least one means for injecting at least one of Ga ^¬ ses in the oven and at least one measuring unit for detecting the at least one measured variable. The invention applies further be ^¬ a furnace, particularly arc furnace, wherein the at least one means for injecting at least one gas into the furnace through a furnace wall of the furnace in egg ^¬ NEN furnace chamber is guided.

During the operation of a furnace, such as an electric arc furnace, a ladle furnace, a degassing plant or other plant of secondary metallurgy, a glass melting tank, etc., it is important, at any desired time certain metrics that characterize the furnace or Schmelzbe ^¬ drive, in To bring experience. This can be done by means of a contact-type measurement, for example by means of a manual measurement and sampling or alternatively via a contactless measurement, for example on the basis of an emitted from the treated material, the melt or the furnace itself vibration or electromagnetic radiation.

Many types of furnaces, particularly metallurgical furnaces such as electric arc furnaces, have on the furnace wall instal ^¬ profiled equipment for injecting at least one gas into the furnace, for example, energy in the furnace enter to speed up the melting process in the electric arc furnace, the metal to fresh etc. Such a device for injecting at least one gas into the furnace may be a burner unit, a burner lance unit, a lance unit and the like. From a burner unit, a flame is formed in the burner mode. In this case, fuel, in particular natural gas, oil and the like, burned with the addition of a fuel gas containing oxygen.

Lances are often limited in time and introduced locally into the furnace chamber in order, for example, to supply gases, such as oxygen for refining a molten metal, to detect various ^measured quantities or to take samples. But firmly installed lance units are known, which are fixed to the furnace.

EP 1 457 575 B1 describes a device of the type mentioned at the beginning for observation of charging material in an electric roof during the melting operation. For this purpose, a burner unit with a camera, in particular spectroscopic Inf ^¬ rarotkamera, equipped, which is arranged in the interior of the burner unit and detects a temperature distribution in the oven ^¬ space.

In addition to conventional burner units, which can only be operated in burner mode, burner lance units are now known, which form a composite of a burner unit and a lance unit, wherein an operation of such a unit alternately in the burner mode or can be done in lance mode.

As with a conventional burner unit is also used ei ^¬ ner burner lance unit when operated in burner mode Ben produced a flame and entered energy into the oven chamber. However, the burner-lance unit according From ^¬ circuit of the burner mode, ie switching off the flame, be used as a lance through the blown a stream of gas into the furnace chamber and metrics can be captured. For this purpose, gas connections for at least one gas to be injected in the lance mode are present in addition to the connections for fuel and fuel gas present on a conventional burner unit on a burner-lance unit. Also on such burner lance units measuring units have already been installed, which use a running through the burner lance unit in the direction of furnace chamber channel for an optical measurement size detection in the furnace chamber.

It has been found that an exchange of measuring units on ovens, in particular electric arc furnaces, for example due to a defect or the need to use another type of measuring unit to detect another measured variable, is relatively frequent. The positioning of the new measuring unit is complicated, since an exact Neupositio ^¬ ning must take place. For example, in the lance mode, the transition region between a formed lance gas cone and the furnace atmosphere must not collide with the measurement site for a temperature measurement, as this leads to erroneous measurements. Furthermore, a furnace standstill is necessary for the safety of the oven operator to perform a safe change of a measuring unit can. All this leads to delays in kiln operation and unwanted standstill times. This increases the operating costs of the furnace and the throughput of the furnace is reduced.

The invention is thus based on the object to provide a Vorrich ^¬ processing of the type mentioned which ensures a more efficient furnace operation in an exchange of a measuring unit in an oven, as well as provide a furnace with such a device.

The object is achieved for the device for detecting at least one measured variable on a furnace, in particular an electric arc furnace, in that the device comprises at least the following:

- At least one means for injecting at least one gas into the furnace;

 - At least one measuring unit for detecting the at least one measured variable; and

at least one assembly for positioning the at least one measuring unit with respect to a cold end of the at least one device for injecting at least one gas in the oven, wherein the at least one module min ^¬ least one positioning and at least one exchange ^¬ seleinheit includes, which is set to enter a detachable connection with the at least one positioning, and wherein the at least one positioning unit on the at least one device is arranged for injecting at least one gas into the furnace and the at least one exchange unit for receiving at least one measuring head of the at least one measuring unit is arranged.

By a "cold" end of a device for injecting at least one gas in the furnace is in this case., The end verstan ^¬ which is disposed outside a furnace other hand, the "hot" at one end of a means for injecting at least one gas in the Oven understood that end, which adjoins the furnace room. In the case of a burner or burner lance unit, the hot end is therefore that end at which a flame is formed at least temporarily.

Attached to the device for injecting at least one gas positioned in the furnace at least one positioning unit is thence positioned only once and aligned and ver ^¬ then remains unchanged in this position, at least as long as no replacement of, in particular the at least one positio ^¬ niereinheit bearing parts of Means is required for injecting at least one gas into the furnace or there is a defect in the positioning unit itself. A Repa ^¬ temperature or an exchange of at least one measurement unit, or at least the measurement head, are due to the releasable

Connection between positioning unit and exchange unit be ^¬ particularly quickly and effectively feasible, since the at least one positioning exactly the optimum position for the mindes ^¬ least one exchange unit including at least one measuring head of at least one measuring unit. A langwie ^¬ engined positioning at least the measuring head of the at least one measuring unit can thus be omitted, because with closing of the releasable connection between the positioning and exchange unit directly a positionally correct arrangement of at least the measuring head of the at least one measuring unit is achieved.

The object is achieved for the furnace by comprising at least one device according to the invention, wherein the Einrich ^¬ device for injecting at least one gas is passed into the furnace through a furnace wall of the furnace in a furnace chamber. Such a furnace is particularly effective and inexpensive to operate. In particular, the furnace is a metallurgical furnace such as an electric arc furnace, but other furnaces such as glass melting tanks are also effective and inexpensive to operate with the apparatus of the present invention. With the device according to the invention, a minimization of the downtime of a furnace, in particular a continuous furnace operation, is possible. This minimizes the operating costs, in particular the required energy ^¬ use, and increases the throughput of the furnace and the quality of the products produced. The respectively required or required measuring units can be used variably with regard to the type of measuring unit as well as the sequence and / or combination of the measuring units used. Also, a temporary operation of the furnace, during which no exchange unit is located in the positioning unit, is readily feasible. A defect in the device for injecting at least one gas into the furnace itself can be quickly and easily repaired after disconnecting the detachable connection, the previously decoupled exchange unit being used directly in the repaired device for injecting at least one gas into the furnace can. In a device for injecting at least one gas in the furnace is in particular a burner A ^¬ uniform, a burner lance or lances unit unit. On an oven are preferably per device for injecting at least one gas into the furnace structurally equal ^¬ formed assemblies used to ensure interchangeability of the exchange units between them.

In order to perform a detection of one or more - same or different - measured variables, such as a detection of temperature (s), chemical analysis, sound, structure-borne noise, such as ultrasound, etc., can be a means for injecting at least one gas in the Furnace at least one measuring unit with a plurality of measuring heads and / or measuring units of different types to be arranged downstream, wherein at least their measuring heads are arranged at or near the cold end of a device for injecting at least one gas into the furnace. It can be set up an exchange unit to record only a measuring head ^¬ a measuring unit to an entire measuring unit. Under a measuring head, the part ei ^¬ ner measurement unit is understood generally that be- seen as an interface measurement unit and measurement environment used for signal detection. Furthermore, the measuring heads of measurement ^¬ units of different types and / or redundant measuring heads can be installed together in an exchange unit. In a particularly preferred embodiment of the invention, the at least one positioning unit is arranged at the cold end of the at least one device for injecting at least one gas into the furnace. This ensures a ^good accessibility of the at least one positioning unit, for example for the oven operator. Preferably, a positioning unit is fixed to a pipe of the device for injecting at least one gas into the furnace.

It has proven to be advantageous if the detachable connection by a snap closure, a snap closure, a Baj onettverschluss, a screw cap, a clamp closure, a Guillemin coupling, a Storz clutch, a Perrot coupling, a dog clutch and derglei- is formed. This allows a quick and simp ^¬ ches forming and release of the releasable connection between the positioning unit (s) and the exchange unit (s). The compounds mentioned can be used reliably and with low maintenance in the usually quite rough oven environment.

The at least one measuring unit preferably comprises Minim ^¬ least an optical measuring unit and / or at least one sound sensor and / or at least one acceleration sensor and the like. Such units of measurement operate without contact, ie without making contact with a material that has been treated in the furnace chamber, and therefore particularly quickly and reliably. Emitted from a furnace audible sound can be recorded via a sound sensor and certain furnace conditions, such as are clearly derived out ^¬ a foamed slag formation in the furnace chamber, therefrom. Structure-borne noise can be detected at the furnace by means of an acceleration sensor, and certain oven states, such as, in particular, foaming slag formation in the furnace chamber, can be derived therefrom.

It is particularly preferred if the at least one optical measuring unit comprises a temperature measuring unit and / or a unit for carrying out a chemical analysis.

A suitable unit for performing a chemical analysis usually comprises a laser. The laser beam is sent into the furnace chamber and the light reflected back against the emission direction is evaluated.

An optical temperature measurement unit is preferred to be ^¬ oriented to detect a along a longitudinal axis of the means for injecting at least one gas in the furnace in the direction of the emitted radiation from the furnace space. For contactless optical temperature measurement, a measuring unit in the form of a laser, a camera, Pyrome ^¬ ters or Ondometers is preferably employed, these being used alone or in combination with optical fibers can transmit the radiation emitted from the furnace chamber in the direction of the device for injecting at least one gas into the furnace radiation to the evaluation. However, the person skilled in the art is free to use here, as an alternative, other common devices which are suitable for contactless temperature measurement.

An optical temperature measuring unit preferably has a device for bundling radiation as a measuring head. This device can be designed, for example, as a lens or lens ^¬ system. By such a bundling device for radiation, in particular temperature radiation, it is possible that a maximum proportion of emitted in the direction of the longitudinal axis of the device for injecting at least one gas into the furnace from the furnace chamber radiation for determining the temperature of the material or the melt in the furnace chamber is available.

The determined temperature in the furnace chamber can be used advantageously for controlling and / or regulating a process variable of a process taking place in the furnace chamber. For example, the energy input of the electrodes of the arc furnace can be controlled or regulated specifically for an electric arc furnace on the basis of a determined temperature distribution. Also, for example, an addition of aggregates and the like depending on the temperature or the temperature distribution in the furnace chamber.

In the event that at least one measuring head of an optical measuring unit is used in the exchange unit, the

Exchange unit at its end pointing to at least one positioning unit at least one inspection opening for the measuring head. This inspection opening, which must be permeable to a radiation emitted and / or to be received by the optical measuring unit, can be detected by a simple method

Hole in the exchange unit or a corresponding radiation ^¬ permeable window be formed. To the atmosphere in the furnace chamber from the ambient atmosphere from ^¬ zugrenzen, comprises at least one device for injecting at least one gas into the furnace at its side remote from the furnace chamber cold end preferably an optical window to which the at least one module is connected. This must be permeable to any type of radiation that is to enter the furnace chamber from the furnace room into or out of an optical measuring unit. It has proven useful if the at least one device for injecting at least one gas into the furnace has a central channel K disposed centrally with respect to its longitudinal axis A, wherein the optical window is arranged to enclose the channel K. The channel K forms a direct access to the furnace chamber at the furnace.

The longitudinal axis A of the at least one device for injecting at least one gas into the furnace preferably forms the center axis of the channel K, through which, for example, in the burner or lance mode gas is injected into the furnace chamber. The channel K is preferably formed in a straight line, so that emit radiation ^¬ oriented along the channel K also rectilinear, ie, substantially without interference, can spread. The

Longitudinal axis A preferably has an angle to the horizontal len, in particular to the surface normal of a melt in the furnace chamber, from 40 to 43 degrees.

It is preferred if the at least one positioning at least one sleeve for receiving comprises at least one alternating seleinheit, wherein a sleeve longitudinal axis Minim ^¬ a sleeve is disposed in alignment with the longitudinal axis A of the device for injecting at least one gas in the furnace of tens or, in particular automatically, can be arranged. In a preferred embodiment of the invention the at least one positioning unit comprises a rotatable turret ^¬ head with at least two sleeves each for receiving Minim ^¬ least one exchange unit, and one with the turret Actively connected drive motor which rotates the turret in the desired position.

Alternatively, the at least one positioning unit may comprise a slide system with at least two sleeves each for receiving at least one exchange unit, and an active connection with the slider ^¬ system drive motor which moves a slider of the slide system, and thus the sleeve, including the exchange units, in the desired position.

By the drive motor, the position of the sleeves relative to the means for injecting at least one gas into the furnace is changed so that the desired, introduced into the respective sleeve exchange unit including at least one measuring head of a measuring unit in a measuring position is quickly and accurately positioned.

This makes it possible to record different measured variables by means of a fast, in particular automatic replacement of exchange units on the furnace. In the case of a defect in the area of the exchange unit, by exchanging the exchange unit including at least the measuring head for an exchange unit including an identically constructed, functional measuring head, a measurement can be continued with only a minimal interruption time.

It has proven useful when the device take at least one robot for receiving the at least one exchange unit and to insert the at least one exchange unit and in the Ent ^¬ comprises at least one exchange unit from the at least one positioning unit. As a result, they are very quickly replaced with a de ^¬ fect in the field of an AC unit. Also the replacement of an exchange unit comprising at least one measuring head of a measuring unit against a wider at ^¬ exchange unit with at least one measuring head of a measuring unit of a different type can be performed efficiently. Such an operation is without oven operators and thus particularly safe, inexpensive and in Dauerbe ^¬ drive feasible. The device preferably comprises at least one control and regulating device for controlling the at least one measuring unit and / or at least one gas quantity regulating device connected to the device for injecting at least one gas into the oven.

Often, when acquiring certain measurands, it is often necessary to change to a particular mode of the means for injecting at least one gas into the furnace.

With at least one means for Eindü ^¬ sen of at least one gas into the furnace in the form of a burner lance unit is the standard operation of a metallurgical furnace, particularly arc furnace, typically as follows:

During the charging of the material to be melted into the furnace chamber, the burner lance unit is operated with a protective ^{flame in} order to keep free the opening of the burner lance unit directed towards the furnace chamber. Subsequently, the burner-lance unit is operated in the burner mode and the power increased stepwise to assist in the melting of the material in the furnace chamber. As soon as a sufficient amount of molten metal is present, the burner-lance unit is switched to the lance mode and injected oxygen or oxygen ^¬ containing gas for refining the molten metal at supersonic speed in the furnace chamber. During the lance mode, the protective flame which normally surrounds the injected gas stream usually burns again. Once the oven can be tapped, ie the furnace chamber can be emptied, the gas stream is switched off, the burner-lance unit continues to operate to form the protective flame and removed the molten metal. The standard operation now starts anew with the charging of the material to be melted into the furnace chamber. In particular, in the lance mode, a burner-lance unit can be used to perform an optical measurement by means of a measuring unit in the furnace chamber. In this case, for example, in an arc furnace in Lanzenmodus einzublasendes gas Supersonic velocity is injected into the furnace chamber in the direction of a melt in order to blow away slag which forms on the melt and to release the surface of the melt locally, for example for contactless temperature measurement. In order to generate a gas flow at supersonic speed, the burner-lance unit in particular has a Laval nozzle, in which the gas to be injected is fed with a few bar pressure. By means of the at least one control and regulating device, the gas quantity regulating device of the device for injecting at least one gas into the furnace can thus be correspondingly controlled, for example before receiving certain measured variables with a measuring unit, wherein the mode required for the respective measuring operation is set. For in ^¬ play, an optical temperature measurement would be on a burner unit in particular a burner shutdown or initiate to ^¬ minimum fuel cut and to choose an operation in the lance mode at a burner-lance unit.

However, the at least one control and regulation ^device is preferably also set up to control the drive motor and / or the at least one robot. This enables a seamless interaction between the operation of the device for injecting at least one gas into the furnace and the selection and sequence of exchange units to be attached in order to determine the desired measured variables.

The control and regulating device can also be set up to control the electrodes of an arc furnace, control the loading or unloading process of the furnace, etc.

The control and regulating device is connected in a preferred embodiment of the invention with a computing unit, via which can be taken automatically or manually via the oven operator directly influence on the detection of a ^¬ voted measurement, evaluations of Measured variables made and the melting process can be influenced accordingly.

In addition, it has proven useful if the device comprises a magazine for storing and / or providing a number of exchangeable units, each with at least one measuring unit accommodated therein, or at least its measuring head. The pre ^¬ holding a plurality of exchange units, which can be selectively detachably connected to the at least one positioning unit NEN, minimized at a defect of a measuring unit or the

Measuring head, the occurring time span in which the measurement must be interrupted un ^¬ . For use with a robot that exchanges exchange units automatically when needed, the magazine forms a locally well-defined and well-stocked warehouse for exchange units, including measuring heads and entire measuring units.

In a preferred embodiment of the device, a plurality of devices for injecting at least one gas into the furnace are present, which are each connected via at least one module with at least one measuring unit, so that simultaneously measured variables for different areas in the furnace chamber of a furnace can be detected the direction of which show the means for injecting at least one gas into the furnace. For example, a determination of a local and / or temporal temperature distribution or

Foam slag formation rate done.

Further advantages of the invention will become apparent from the exemplary embodiments, which are explained with reference to the following figures 1 to 8. Show it:

1 shows a cross section through an oven with a first

 Contraption;

1 shows in the region of the device for injecting at least one gas into the furnace and the measuring unit, wherein the device further comprises a robot; 3 shows an assembly with measuring head;

 4 shows the assembly according to FIG 3, installed in a lance

 a burner lance unit;

5 shows an enlarged detail of FIG 4 in the area of

 assembly;

 6 shows a burner lance unit comprising the arrangement according to FIG 4;

 7 shows a second device comprising a positioning unit with a rotating turret; and

8 shows a third device comprising a Positionierein ^{¬ unit} with slide system.

1 shows a cross section through an oven 1, here an electric arc furnace, with a furnace lid lc and electrodes ld, which are guided by this in a furnace space la. For simplicity, only ^¬ represented one of usually three electric to ld. In the furnace space la of the furnace 1 is a

Melt 2, here a molten metal, arranged on the surface slag 2a is located. A first device comprising a device 3 for injecting at least one gas into the furnace 1, here in the form of a burner-lance unit, which is installed above the melt 2 or guided through the furnace wall 1b, is installed on the furnace 1. In this case, the outflow opening 3d of the burner-lance unit is directed onto the surface of the melt 2. The burner-lance unit has a central channel K, through which a gas flow in the direction of the melt 2 in the furnace chamber la can be conducted in the lance mode. The burner-lance unit has a plurality of connections to ^¬ a gas supply means 4 for supplying required in lance operation gas, which is preferably injected at supersonic speed ^¬ in the furnace chamber la. Via the gas supply means 4 is in the lance mode, in particular a first gas, in this case preferably in the form of oxygen, abwech ^¬ nately with a second gas, preferably inert gas injected here in the form of nitrogen, at supersonic speed into the furnace chamber la. Furthermore, at least one fuel supply device 5 and at least one fuel gas supply device 6 are present. By means of a fuel feed device 5, the burner lance unit fuel, here preferably natural gas, fed. The fuel is combined with fuel gas, here before ^¬ Trains t in the form of oxygen, burned, by means of

Fuel gas supply 6 is supplied.

By means of a gas quantity regulating device 12, the supply of the burner lance unit with the currently required ^{gases is} ensured, the burner lance unit being set in the desired mode.

Furthermore, the burner-lance unit has a cooling device 7 for supplying coolant, in particular water. By means of the coolant, the burner lance unit is protected at its hot end from overheating.

A measuring unit 10 in the form of an optical temperature measuring unit, such as a pyrometer, is at the, the

Furnace space la of the furnace 1 facing away from the cold end of the burner lance unit connected to this such that a Tempe ^¬ raturmessung in the furnace chamber la is feasible. The channel K of the burner lance unit is arranged centered relative to the longitudinal axis A of the burner lance unit. Starting from the hot oven ^¬ space la located electromagnetic radiation, in particular temperature or infrared radiation may propagate along the longitudinal axis A and thus enters the channel K of the burner lance assembly.

From the channel K, the radiation passes through an optical window 3e in a measuring head 10b not shown separately (see FIG. 3) of the measuring unit 10. The measuring head 10b is provided here by a bundling device, for example a lens system, which concentrates the radiation and into one Optical waveguide 10a of the measuring unit 10 couples. By means of the measuring unit 10 is determined from the coupled radiation, an associated temperature of the melt 2.

The measuring unit 10 can further light waveguide, and measuring heads with other burner lances units which are arranged at the furnace 1 and the sake of clarity are not Darge ^¬ represents, be connected. However, it is also possible to dispense with the optical waveguide 10a if a measuring unit 10 directly adjoins the cold end of the burner-lance unit facing away from the furnace chamber 1a.

A measuring unit 10 can also be connected to its measuring head 10b by means of a conventional electric cable or can be completely installed in an exchange unit 8b and, for example, be battery-operated.

An assembly 8 is used to position the measuring unit 10 with respect to a, the furnace chamber la remote from the cold end of the burner-lance unit. The module 8 includes a positioning unit 8a and 8b an exchange unit which is turned rich ^¬ tet enter into a releasable connection with the positioning unit 8a. In this case, the positioning unit 8a is arranged on the burner-lance unit and the exchange unit 8b is set up to receive the measuring head 10b of the measuring unit 10.

The device further comprises a control and regulation ^¬ means 11 for controlling the measuring unit 10 and connected to the burner lance unit Gasmengenregeleinrich- tung 12. By means of the control and regulation device 11 can be made generally interventions that the turning on or off the burner mode, a change in the supply quantities for fuel and / or fuel gas, the switching on or off of the lance operation and / or the selection and quantity of gas injected in lance operation, optionally further (not shown here) a change in the power supply to the electric ^¬ the ld of the arc furnace, a change in the position of the Induce electrodes ld of the arc furnace, the beginning of a charging or parting operation, etc.

The control and regulating device 11 is here connected to a computer unit 16, via which the oven operator can directly or automatically influence the detection of a specific measured variable, evaluations of the measured variables can be made and the melting process can be influenced accordingly.

FIG 2 shows a detail of Figure 1 in the direction A ^¬ 3 for injecting at least one gas in the furnace 1 or the burner lances unit and the measurement unit 10, where a further ^¬ only schematically illustrated here in the device Robot 13 includes, which is controlled by the control and regulating device 11. The robot 13 is set up to separate the exchange unit 8b including the measuring head 10b, which is not shown in detail here, in the case of a defect in the measuring head 10b from the positioning unit 8a, which is likewise not shown here in detail, and against an identical exchange unit 8bi, 8b2 , 8b3, 8b ₄ , 8b ₅ , 8b6, 8b ₇ , 8bs, 8bg, each including a measuring head 10b, which is held in a magazine 14. The exchange unit 8b with a defective measuring head 10b can be deposited by the robot in an unoccupied magazine opening 14a of the magazine 14.

It is also possible to have a plurality of magazines with exchangeable units 8b provided with different contents, or to have exchangeable units 8b with different configurations in a single magazine 14.

3 shows an assembly 8 comprising a Positionierein ^¬ integrated 8a and 8b an exchange unit, in which a measurement head is fitted 10b a measuring unit 10th To form a connection between the cash lös ^¬ positioning unit 8a and 8b of the exchange unit is here a Guillemin coupling 9a, 9b. The exchange unit 8b has an inspection window ter 8c and is insertable in a view seen in the positioning unit 8a before ^¬ sleeve 8aa. When inserting the exchange unit 8b in the positioning unit 8b of the measuring head 10b of the measuring unit 10 is arranged centered in this and fixed by closing the Guillemin coupling 9a, 9b in this position. Instead of a Guillemin coupling 9a, 9b, a different type of detachable connection, for example, a Baj onettverschluss etc., are used. The Lichtwel ^¬ lenleiter 10 a of the measuring unit 10 is connected via a quick coupling on the exchange unit 8 b.

4 shows the assembly 8 according to FIG. 3, attached to a lance 3a of a device 3 for injecting at least one gas into the furnace 1, or a burner-lance unit. At the lance 3a is the gas supply 4 and a mounting plate 3b. Within the lance 3a is the channel K, which is closed by the optical window 3e to the positioning unit 8a. 5 shows an enlarged detail of FIG 4 in the area of the Be ^¬ assembly. 8

6 shows a burner lances unit 3 comprises at ^¬ order as shown in FIG 4 with lance 3a and 3b assembly 8. The installation- geplatte to the lance 3a is connected in a gastight manner via a further mounting plate at the burner ^¬ 3c therewith. The burner lance unit has at its hot end an outflow ^¬ opening 3d and is connected at its cold end to the assembly 8. The measuring head of the measuring unit is centered to the longitudinal axis A of the burner-lance unit and the channel K (see FIG 1) positioned.

7 shows a schematically illustrated second device having an only partially shown device 3 for injecting at least one gas in the furnace 1 or burner lances unit and an assembly comprising a positio ^¬ niereinheit 8a with a rotatable turret 8ab. The positio ^¬ niereinheit 8a includes a cuff at the burner 8ad Lance unit, about which about a rotational axis 8ac rotatable by means of a drive motor 15 rotatable turret 8ab fixed to the burner-lance unit and is positioned relative to the channel K ^¬ . A number of sleeves 8aa in the turret 8ab are used for receiving and positioning exchange units 8b, each equipped with measuring heads of one or more measuring units 10. Each of the measuring head, which is arranged centered to the longitudinal axis A of the burner-lance unit 3, provides the desired measurement In this case, each sleeve 8aa can be equipped with an identical exchange unit 8b including measuring head, so that in a registered by the control and Reg ^¬ treatment device 11 defect of the currently centered on the longitudinal axis A measuring head only the turret 8ab must be rotated by means of the drive motor 15 such that another sleeve 8aa and thus other exchange unit 8b to the longitudinal axis A is centered. A Umstecken the Lichtwel ^¬ lenleiters 10 a in the other exchange unit 8 b can be ^¬ example by means of a robot 13 (see FIG 2) follow. Alternatively, a measuring head connected to a measuring unit 10 may be located in each of the sleeves 8aa. Alternatively, a complete measuring unit 10 may be located in each exchange unit 8b. The same or different measuring units 10 or measuring heads 10b can be used in the exchangeable units 8b.

8 shows a schematically illustrated third device with an only partially shown device 3 for injecting at least one gas in the furnace 1 and a burner lances unit and an assembly comprising a Po ^¬ sitioniereinheit 8a 8ae with pusher system. The positioning ^¬ unit 8a comprises a sleeve 8ad fixed to the burner lance unit 8ae the slide system on the burner lance unit and positioned opposite the channel K. A number of sleeves 8aa in the slider of the slide system 8ae ^¬ nen for receiving and positioning of changing units 8b, each equipped with measuring heads of one or more Messeinhei ^¬ th 10. Each of the measuring head, the longitudinal axis A of the burner ner lances unit is positioned centered, the ge ^¬ desired measured quantities, such as temperature, hearing ^¬ sound, impact sound, chemical analysis gives etc. In this case, each sleeve 8aa equipped with an identical change unit 8b inclu- sive measuring head or measuring unit be, so that in egg ^¬ nem registered by the control and regulating device 11 defect of the currently centered on the longitudinal axis A measuring le ^¬ diglich the slide must be moved by means of the drive motor 15 'such that another sleeve 8aa and thus other exchange unit 8b for Longitudinal axis A is centered. In each of the sleeves 8aa may be located a measuring head, which is connected to a measuring unit 10, or are also a complete measuring unit. In this case, can be used in the exchange units 8b are identical or different ^¬ Liche measuring units or measuring heads.

The device of the invention can be carried out by the skilled artisan knows ^¬ teres feed tubes and single burner units without lance function lances units without a recorder function or simple gas, although FIG 1 to 8 show only devices with burner lances units. Also, the device can be used not only for the metallurgical furnaces shown by way of example in FIGS. 1 and 2, but also, for example, to glass melting tanks or other types of furnaces equipped with means for injecting at least one gas into the furnace.

Claims

claims 1. A device for detecting at least one measured variable on a furnace (1), in particular an arc furnace, the device comprising at least the following:  - at least one device for injecting at least one gas into the furnace (3); - at least one measuring unit (10) for detecting the Minim ^¬ least one measurement variable; and - At least one assembly (8) for positioning the min ^¬ least one measuring unit (10) against a cold end of the at least one device (3) for injecting at least one gas into the furnace (1), wherein the at least one assembly (8) at least includes a positioning unit (8a) and at least one switching unit (8b) is which is ^¬ directed to enter (8a) a releasable connection with the at least ei ^¬ NEN positioning unit, and wherein the min ^¬ least one positioning unit (8a) at the at least ei ^¬ NEN means (3) for injecting at least one gas in the furnace (1) and the at least one Wech ^¬ seleinheit (8b) is adapted for receiving at least a measuring head (10b) of the at least one measuring unit (10). 2. Apparatus according to claim 1, wherein the at least one positioning unit (8a) is arranged on the kal ^¬ th end of the at least one device (3) for injecting at least one gas into the furnace (1). 3. Device according to one of claims 1 or 2, wherein the releasable connection by a snap closure, a buckle closure, a Baj onettverschluss, a Screw closure, a clamp closure, a guillemin coupling (9a, 9b), a Storz coupling, a Perrot coupling, a dog clutch, is formed. 4. Device according to one of claims 1 to 3, wherein the at least one measuring unit (10) comprises at least one optical measuring unit and / or at least one sound sensor and / or at least one acceleration sensor. 5. Apparatus according to claim 4, wherein the at least one optical measuring unit comprises a tempera ^¬ tower measuring unit and / or a unit for performing a chemical analysis. 6. Apparatus according to claim 4 or claim 5, wherein the at least one switching unit (8b) min ^¬ least an inspection opening (8c) at its pointing towards the at least one positioning unit (8a) for the end of at least one measuring head (10b) of an optical measuring unit. 7. Device according to one of claims 1 to 6, wherein the at least one device (3) for injecting at least one gas into the furnace (1) having an optical window (3e) at its cold end to which the Minim ^¬ least one assembly (8) is connected. 8. Apparatus according to claim 7, wherein the at least one device (3) for injecting at least one gas into the furnace (1) is arranged a centrally with respect to their longitudinal axis A, having continuous channel K, and wherein the optical window (3e) the channel K is sealingly on ^¬ sorted , 9. Device according to one of claims 1 to 8, wherein the at least one positioning unit (8a) comprises at least one sleeve (8 aa) for receiving the at least one change ^¬ unit (8b), wherein a sleeve longitudinal axis of the Minim ^¬ least one sleeve (8 aa) flush processing to the longitudinal axis A of the Einrich- (3) for injecting at least one gas into the furnace (1) is arranged or can be arranged. 10. Device according to one of claims 1 to 9, wherein the at least one positioning unit (8a) includes a rotating turret cash ^¬ (8ab) having at least two sleeves (8 aa) each for receiving at least one switching unit (8b) and with the Turret (8ab) operatively connected drive motor (15). 11. Device according to one of claims 1 to 9, wherein the at least one positioning unit (8a) comprises a slide system (8ae) with at least two sleeves (8aa) for accommodating at least one change unit (8aa) and a drive motor (15 ') operatively connected to the slide system (8ae). 12. Device according to one of claims 1 to 11, wherein the device comprises at least one robot (13) for on ^¬ take the at least one switching unit (8b) and a ^¬ set the at least one switching unit (8b) into and unloading take ^¬ the at least one switching unit (8b) of the at least one Positioning unit (8a) comprises. 13. Device according to one of claims 1 to 12, wherein the device comprises at least a control and regulation ^¬ means (11) for driving the at least one measuring unit (10) and / or at least one with the device (3) for injecting at least one gas into the furnace (1) connected gas flow control device (12). 14. Device according to claim 13, wherein the at least one control and regulating device (11) is further set up to control the drive motor (15, 15 ') and / or the at least one robot (13). 15. Device according to one of claims 1 to 14, the apparatus further comprising a magazine (14) for storing and / or providing a number of exchangeable units (8b). 16. Oven (1), particularly electric arc furnace, comprising Minim ^¬ least a device according to any one of claims 1 to 15, where ^¬ Minim ^¬ least a gas at the at least one device (3) for injecting into the furnace (1) through a furnace wall (Lb) of the furnace (1) in a furnace chamber (la) is guided. 17. A furnace (1) according to claim 16, wherein the at least one means (3) for injecting at least one gas into the furnace (1) by a burner unit, a burner-lance unit or a lance unit is formed.