EP3068540A1

EP3068540A1 - Filtering of an exhaust gas of a metallurgical plant, which exhaust gas comprises solid particles

Info

Publication number: EP3068540A1
Application number: EP14799692.0A
Authority: EP
Inventors: Philipp Aufreiter; Thomas KEUSCH; Florian Wackerle; Franz Hartl; Johann Fleischanderl; Martin LEHOFER; Andreas ROHRHOFER; Michael WEINZINGER
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2013-11-13
Filing date: 2014-11-06
Publication date: 2016-09-21
Also published as: WO2015071151A1; CN105992651A; EP2873464A1; JP2016537189A; US20160279646A1

Abstract

The invention relates to a method for operating a filter system (1) for filtering an exhaust gas (11) of a metallurgical plant (12), which exhaust gas (11) comprises solid particles (10), wherein the filter system (1) has at least one electrode pair (2), to each of which an electrical power and/or an electrical voltage and/or an electrical current can be applied. The invention further relates to a system for operating such a filter system (1) and to a plant for filtering an exhaust gas (11) of a metallurgical plant (12), which exhaust gas (11) comprises solid particles (10), and which metallurgical plant (12) comprises such a filter system (1). In order to provide a method or a device by means of which an exhaust gas (11) of a metallurgical plant (12), which exhaust gas (11) comprises solid particles (10), can be filtered in a resource-saving manner, the method according to the invention comprises the following method steps: identifying a process phase (7) of the metallurgical plant (12), identifying a feed-forward (8) of the respective electrode pair (2) dependent on the identified process phase (7), wherein the identified feed-forward (8) comprises an electrical power and/or an electrical voltage and/or an electrical current to be applied, applying to the respective electrode pair (2) according to the identified feed-forward (8).

Description

description

Filtering a solid article having exhaust gas of a metallurgical plant

The invention relates to a method for operating a filter system for filtering a solid article having exhaust gas of a metallurgical plant, wherein the filter system has at least one electrode pair, which in each case with an electrical power and / or an electrical voltage and / or an electric current can be acted upon. Furthermore, the invention relates to a system for operating such a filter system and a system for filtering an exhaust gas having a substance particles of a metallurgical plant, which comprises such a filter system.

In metallurgical industrial plants electrical filters, also called E-filters, are used to purify exhaust gases. These filters work on the principle that by ionization of the dust particles in the exhaust gas by means of two

Plates, which are referred to as a spray electrode and a precipitation electrode, the dust particles are pulled to a plate. From the plates, the dust particles are removed via a mechanical apparatus, e.g. by punches on the plates. The dust particles fall off the plates and are transported to a dust container and collected there. For example, an e-filter may have about 30 pairs of plates.

The pollution of the exhaust gas with dust depends on the process status of the metallurgical plant that supplies the filter. In a converter, e.g. during the refining process the highest dust concentration, in contrast to the Scrap Charging, where the dust concentration is low.

Regardless of the process state and the expected dust concentration in the exhaust gas, e-filters in metallurgical industrial plants are operated unregulated. That means, that the strength of the electric field between the plates remains the same throughout the production process. A shutdown during production breaks is carried out manually by the staff.

Such an electrostatic filter and a method for its operation are known for example from DE632608C or from EP0210675 AI. The invention has for its object to provide a method or a device by means of which or which a solid particles exhibiting exhaust gas of a metallurgical plant can be filtered resource-saving.

This object is achieved by a method of the type mentioned above in that the method comprises the following method steps:

Determining a process phase of the metallurgical plant, determining a respective feedforward control of the respective electrode pair which is dependent on the determined process phase, wherein the respectively determined feedforward control comprises a respective electrical power to be acted upon and / or a respective electrical voltage to be acted upon and / or a respective one to be acted upon electric current,

- Applying to the respective electrode pair according to the respective determined pilot control. Furthermore, this object is achieved by a system of the type mentioned above in that the system has a computing unit, by means of which a process phase of the metallurgical plant and a respective, dependent on the determined process phase precontrol of the respective electrode pair can be determined, the respective determined Pre-control, a respective electrical power to be acted upon and / or a respective to be acted upon electrical see voltage and / or a respective current to be acted upon.

Finally, this object is achieved by a system of the type mentioned above in that the system has such a system.

The filter system has at least one electrode pair, which is in each case designed, for example, as a pair of plates. Preferably, the filter system is divided into two or more fields or areas, which are arranged, for example, in the flow direction of the exhaust gas behind one another, wherein in each of the fields at least one electrode pair is provided.

In particular, the respective feedforward control of the respective electrode pair, which is dependent on the determined process phase, is predetermined in advance, wherein the respective feedforward control provides separate specifications, in particular for a plurality of electrode pairs in different fields. The separate specifications relate to the respective electrical power to be acted upon and / or to the respective electrical voltage to be acted upon and / or the respective electrical current to be acted upon. Optionally, the precontrol may also include a speed of a fan or suction fan which is part of the filter system and which draws the exhaust gas through the E-filter or the at least one pair of electrodes. If the precontrol comprises such a speed, the corresponding fan or the corresponding suction fan is operated at a speed according to the precontrol. In general, the respective feedforward control as

Manipulated variable or as a target size for the respective size to be understood. The at least one electrode pair is preferably connected by means of a high-voltage power supply with the respective electrical power to be applied and / or the respective electrical voltage to be applied and / or the supplied to each acted upon electrical power. If an electrical power is specified as the manipulated variable by the respective precontrol, then, for example, the respective voltage to be acted upon and / or the respective current to be applied can be selected or regulated such that the desired power is delivered to the respective electrode pair. The respective electrical current to be acted upon can be selected or regulated in an analogous procedure such that the respective electrode pair is acted upon by a suitably selected electrical voltage. In the event that the filter system has a plurality of electrode pairs in different fields, it is advantageously provided that the electrode pairs of different fields can be acted upon separately.

The loading of the respective electrode pair is triggered by the arithmetic unit, which is preferably connected to the respective high voltage power supply. According to the invention, the admission of the respective

Electrode pair according to the respective, determined pilot control, which in each case depends on the determined process phase of the metallurgical plant. For example, the following process phases are conceivable for the example of a converter as a metallurgical plant, for which the English technical terms are often used: Charging or Scrap

Charging, Ignition, Blowing, Tapping, Slag Splashing. Since different exhaust gas volume flows or different exhaust gas concentrations are to be expected for the different process phases, the respective electrode pair can consequently be acted on according to a respective, adapted pilot control.

For example, a particularly high-performance pilot control of the respective electrode pair is required for the process phase "blowing", since during this phase particularly large amounts of exhaust gas are produced, which in particular have comparatively many solid particles a comparatively large electrical power and / or voltage and / or a comparatively large electrical current applied to filter out as many of the solid particles from the exhaust gas.

On the other hand, for the process phase "scrap charging", ie the introduction of the material to be processed in the converter, a comparatively weak precontrol of the respective electrode pair is sufficient, since during this phase comparatively small amounts of exhaust gas and a comparatively small amount of solid particles are to be expected a comparatively large power saving in the filtration of the exhaust gas can be realized, since the principle of operation of an e-filter requires that at a low dust load, the voltage can rise without a rash to the maximum and this has a correspondingly high current result Electricity consumption at the lowest dust concentration, so that it can be determined that with a low polluted exhaust gas and a constant driving style or operation of the filter system, the drawn power of the filter system is the highest.

In particular, if the filter system has several fields, each with at least one pair of electrodes, it can be determined for each individual of the process phases, with which power and / or voltage and / or current is applied to the respective electrode pair or the electrode pair of the respective region Filter system to be acted upon.

The inventive method allows an adjustment of the filter performance of the filter system by the respective electrode pair can be controlled separately, the adjustment based on the different process phases of the upstream hüttentechnischen plant and in particular on the resulting, expected amounts of exhaust gas. As a result, the power consumption of electric exhaust gas filters in metallurgical industrial plants can be dependent on the phases of the process, in particular in compliance with emission limits. Consequently, the method according to the invention permits a resource-saving filtering of the solid articles from the exhaust gas of the metallurgical plant.

In pilot tests, it was possible to achieve a savings of up to 60% in power consumption for the filter system of a converter. This corresponds to a saving of approx.

€ 100,000 per year in electricity costs if customary electricity prices are used in industry.

In an advantageous embodiment of the invention, the metallurgical plant has an automation system, wherein the automation system provides the process phase of the hüttentechni plant see.

In particular, the automation system of the metallurgical plant is linked to the arithmetic unit, whereby the determination of the process phase can be realized reliably and with comparatively little technical effort. The automation system can be assigned Level 1 or Level 2 of the automation pyramid. In particular, the automation system controls or regulates the processing processes of the metallurgical plant, which are directly linked to the process phases to be determined. The respective process phase of the metallurgical plant can thus be determined, for example, by the fact that the automation system transmits the current process phase of the metallurgical plant to the arithmetic unit. For this purpose, the arithmetic unit can, for example, send a request relating to the process phase to the automation system or a cyclic transmission of the current process phase can be provided. In a further advantageous embodiment of the invention, the process phase is provided in each case in a change in the process phase of the metallurgical plant. A particularly efficient, yet highly reliable communication is achieved by only providing the current process phase when the process phase is changed.

In a further advantageous embodiment of the invention, the metallurgical plant has a converter, wherein a position and / or a rotation angle of the converter is provided to determine the process phase of the metallurgical plant.

The position and / or the angle of rotation of the converter correlates with the current process phase of the metallurgical plant. From the provision of one of the variables or from both variables, the current process phase can thus be determined, which in turn determines the respective precontrol of the respective electrode pair.

In a further advantageous embodiment of the invention, the filter system has an input dust sensor, which is fluidically arranged in front of the at least one electrode pair and by means of which an input concentration of the solid particles of the flowing into the filter system exhaust gas is detected, the process phase of the metallurgical plant based the detected input concentration is determined.

As already explained above, the different process phases of the metallurgical plant require different amounts of exhaust gas and, in particular, different concentrations of the solid particles in the exhaust gas. The input dust sensor detects the input concentration of the solid particles of the exhaust gas flowing into the filter system, the size used being used to determine the current process phase of the metallurgical plants.

This allows an investigator independent of the metallurgical plant and in particular of its automation system. development of the process phase. For example, thus, the unexpected or unwanted presence of a specific process phase can be determined. In the event that the determination of the process phase is additionally based on a connection with the automation system of the metallurgical plant, an independent control of the automation system or the metallurgical plant is made possible. This can be used, for example, for a feedback to the automation system or the metallurgical plant if contradictions occur between the process phase specified by the automation system and the process phase determined by means of the input dust sensor.

In an alternative advantageous embodiment of the invention, the filter system has an input dust sensor, which is fluidically arranged in front of the at least one electrode pair and by means of which an input concentration of the solid particles of the flowing into the filter system exhaust gas is detected, wherein the respective pilot control of the respective electrode pair is calculated by means of a mathematical formula from the detected input concentration.

In particular, the mathematical formula establishes a relationship between the detected input concentration and the respective required precontrol. Thus, the respective feedforward control of the respective electrode pair is calculated directly from the detected input concentration on the basis of the mathematical formula, without the intermediate step of determining the respective process phase being necessary for this. However, it is also conceivable that the mathematical formula is used to first determine the respective process phase of the metallurgical plant, wherein the respective gen determined process phase, the respective feedforward control is determined.

In a further advantageous embodiment of the invention, the respective pilot control of the respective electrode pair is determined by means of a predeterminable table, in which a link between the determined process phase and the respective electrical power to be acted upon and / or the respective voltage to be applied and / or the respective acted upon electrical current is deposited.

In particular, the predefinable table for each of the conceivable process phases comprises the respective feedforward control, for example in the form of specifications which relate to each of the electrode pairs or each of the fields of the filter system explained above. For each process phase, the respective electrical power to be acted upon and / or the respective electrical voltage to be acted upon and / or the respective electrical current to be acted upon are thus specifically stored in the predefinable table. The respective feedforward control or the aforementioned physical variables can be determined in advance, for example by performing corresponding tests.

The predefinable table with the links stored therein allows a comparatively simple operating method of the filter system. In particular, when the process phase with the aid of the automation system of the hüttentechni- see plant is determined, thus the respective pilot control can be determined easily. For this purpose, for example, the arithmetic unit reads out the entries belonging to a specific process phase in the predefinable table and initiates a corresponding loading of the respective electrode pair in accordance with the determined precontrol. Preferably, the predefinable table is stored in one of the arithmetic unit or stored in a memory unit connected to the arithmetic unit. For the example of a metallurgical plant in the form of a converter, the following exemplary feedforward control can be stored in the predefinable table:

In a further advantageous embodiment of the invention, the filter system has an output dust sensor, which is fluidically arranged after the at least one pair of electrodes and by means of which an output concentration of the solid particles of the exhaust gas flowing from the filter system is detected, the respective pilot control of each electrode pair is varied depending on the detected output concentration. By means of the output dust sensor, in particular, the dust intensity in the output air flow of the filter system is continuously detected or monitored. In this case, the output dust sensor can be used to make a readjustment or a fine adjustment of the respective feedforward control. This can be advantageous, for example, if the filter system filters more thoroughly or less thoroughly than initially assumed, and thus fewer or more solid particles are present in the exhaust gas when it leaves the filter system. In a further advantageous embodiment of the invention, the varied feedforward control is stored in the predeterminable table. The storage of the varied pilot control in the predeterminable table allows a kind of regulation, since a feedback is taken into account for the determination of the pilot control. The feedback is realized by adjusting the precontrol for the respective process phase on the basis of the data of the output dust sensor, so that, for example, a lower voltage is provided for a respective electrode pair than was originally stored in the table for this process phase. The adjusted feedforward control is finally stored in the table, which overwrites older entries for the respective process phase.

In a further advantageous embodiment of the invention, the respective pilot control of the respective electrode pair is varied in such a way that a first predeterminable initial concentration is not exceeded.

For example, legal limit values which must be observed when filtering the exhaust gas of the metallurgical plant can be stored as the first predeterminable initial concentration. The adjustment of the respective pilot control is preferably carried out for all conceivable process phases, so that overall operation of the filter system can be ensured, which results in an exhaust emission within the legal limits.

In a further advantageous embodiment of the invention, the respective pilot control of the respective electrode pair is varied in such a way that a second predetermined output concentration is not exceeded.

Values which are comparatively low and which, for example, in the range of only 20% of the statutory limit values can be stored as the second predeterminable starting concentration. moving limits. An adaptation of the respective feedforward control is particularly useful if the output concentration detected by the output dust sensor is very low and, in particular, lower than previously expected. In this case, the respective feedforward control can be varied in such a way that the exhaust gas emission of the filter system is slightly increased, which in some cases allows considerable energy savings and thus also cost savings to be realized. It makes sense to increase the exhaust emission in such a way that legal limits are met.

In a further advantageous embodiment of the invention, the respective pair of electrodes according to a respective emergency pilot control with a respective electrical emergency power and / or a respective electrical emergency voltage and / or a respective electrical emergency power is applied, if the process phase of the metallurgical plant can not be determined, and / or if appropriate, if the input dust sensor and / or the output dust sensor supplies implausible measured values.

The respective emergency precontrol can occur when

Errors are used to ensure sufficient filtering of the exhaust gas and thus the inclusion of legal limit values even in such situations. For example, the respective emergency pilot control is selected such that the respective electrode pair is operated as during that process phase during which the exhaust gas has the most solid particles and the greatest filter effect has to be achieved. The emergency voltage is also referred to as the minimum value of the spray limit.

Such a fault condition exists when the process phase of the metallurgical plant is not available or unknown. This can be the case, for example, if the metallurgical plant has an automation system which fails or malfunctions. Alternatively or additionally, such an error is If the filter system has an input dust sensor or an output dust sensor, one of the sensors or both sensors deliver or deliver implausible measured values. Correspondingly, ranges of the respective measured values are predetermined, which are regarded as plausible or implausible.

In a further advantageous embodiment of the invention, the respective pair of electrodes according to a respective stand-by pilot control with a respective electrical

Stand-by power and / or a respective electrical stand-by voltage and / or a respective electrical stand-by power applied, if the cottage plant is operated for longer than a predetermined period of time in a stand-by state.

The stand-by condition is present in particular in the form of a production break of the metallurgical plant. It is conceivable that there is a melt in a converter of the metallurgical plant, which is temporarily not further processed. In this case, the metallurgical plant continues to emit a comparatively small amount and comparatively few solid particles containing exhaust gas. Accordingly, the respective pair of electrodes can be operated in compliance with legal limits with a comparatively energy-saving mode of operation.

In the following, the invention will be described and explained in more detail with reference to the exemplary embodiments illustrated in the figures. Show it:

1 shows a first embodiment of the invention

Investment ,

2 shows a second embodiment of the invention

Investment,

3 shows an example temporal relationship between a respective pilot control and process phases of a

Converter, and 4 shows an example scheme of an operating concept of another embodiment of the system according to the invention. Figure 1 shows a first embodiment of the system according to the invention. The plant has a filter system 1 for filtering an exhaust gas 11 having solid particles 10, which is supplied to the plant by a metallurgical plant 12. The filtering takes place on the basis of an electrode pair 2, to which an electrical power can be delivered and which is designed, for example, as a plate pair. Furthermore, the filter system 1 is subdivided in the flow direction in four successive fields 20 in the first embodiment.

The electrode pair 2 is acted upon in accordance with a feedforward control 8 with an electrical power to be acted upon, wherein the feedforward control 8 is determined by a computing unit 6 as a function of a process phase 7 of the metallurgical plant 12. The arithmetic unit 6 transmits the determined pilot control 8 to a connected high-voltage power supply 21, which finally supplies the electrode pair 2 with the electrical power to be applied. Alternatively or additionally, the precontrol 8 may be in the form that the electrode pair 2 is subjected to an electrical voltage and / or an electric current.

Figure 2 shows a second embodiment of the inventive system. The same reference numerals as in Figure 1 denote the same objects.

The filter system 1 has four pairs of electrodes 2, which are each accommodated in a separate field 20 of the filter system 1 and in each case can be supplied by a separate high-voltage power supply 21. Furthermore, an input dust sensor 3 and an output dust sensor 5 are provided, which respectively flow before or after the Electrode pairs 2 is arranged and by means of which in each case an input concentration 30 and an output concentration 36 of the solid particles 10 of the exhaust gas 11 is detected. The arithmetic unit 6 is connected to the input dust sensor 3 and the output dust sensor 5, so that the respective concentrations of the solid particles 10 can be transmitted to the arithmetic unit 6. In addition, the arithmetic unit 6 is connected to an automation system 13 of the metallurgical plant 12, so that the arithmetic unit 6 the respective process phase 7 of the metallurgical plant 12 is accessible.

Starting from the process phase 7, which receives the arithmetic unit 6, for example, directly from the automation system 13 or determined based on the transmitted input concentration 30, the arithmetic unit 6 determines the respective feedforward control 8 for the respective pair of electrodes 2. For this purpose, the arithmetic unit 6 accesses a predeterminable table 4, in which a link between the determined process phase 7 and the respective feedforward control 8, in particular the respective electrical power to be acted upon and / or the respective electrical voltage to be acted upon and / or the respective electrical current to be acted upon, is stored.

In this case, the respective feedforward control 8 of the respective electrode pair 2 can be calculated in particular by means of a mathematical formula from the detected input concentration 30.

Additionally or alternatively, it can be provided that the respective pilot control 8 of the respective electrode pair 2 is varied as a function of the detected initial concentration 36, wherein the varied pilot control 8 can be stored in the predefinable table 4. FIG. 3 shows an exemplary temporal relationship between a precontrol 8 and process phases 7 of a converter. In this case, the time is plotted on the x-axis and on the y-axis the pilot control 8 is applied in the form of an electrical power to be applied, with which a respective electrode pair 2 is to be applied in order to achieve a satisfactory filtering of an exhaust gas 11 of the converter. Depending on the process phases 7 "Scrap Charging", which takes place during the time interval 31, "Ignition" 32, "Blowing" 33, "Tapping" 34 and slag splashing 35, a different sized electrical power is required to achieve a satisfactory filtering of the exhaust gas 11. For example, the largest concentration or amount of the exhaust gas 11 is during the oxygen injection

("Blowing" 33) to observe, so that the respective electrode pair 2 then the largest electrical power must be provided.

FIG. 4 shows an exemplary scheme of an operating concept of a further embodiment of the installation according to the invention. The system has a filter system 1 with a pair of electrodes 2 and an input dust sensor 3 and output dust sensor 5 arranged in each case in the filter system 1. Furthermore, an automation system 13 of a hutch-type system 12 is provided, the automation system 13 and the input system Dust sensor 3 are connected to a computing unit 6. The input dust sensor 3 transmits an input concentration 30 and the automation system 13 transmits a process phase 7 of the metallurgical plant 12 to the arithmetic unit 6. The arithmetic unit 6 determines the process phase 7 from the input concentration 30 or uses it from the automation system 13 Process phase 7 received in order to determine the precontrol 8 on the basis of a predefinable table 4.

The determined feedforward control 8 can be used directly to act on the electrode pair 2 or can be varied via a control loop into a type of controlled pilot control 28 be, with which the electrode pair 2 is applied. The controlled feedforward control 28 can thus be understood as the varied feedforward control explained above, which can be stored, in particular, in the predefinable table 4.

The control loop provides that an output concentration 36 determined by the output dust sensor 5 is transmitted to a control unit 15, which performs a comparison with predefinable limit values 16 and derives therefrom control specifications 18, which together with the feedforward control 8 for the controlled feedforward control 28 are processed. The predefinable limit values 16 may be, in particular, the first predefinable initial concentration or second predefinable initial concentration explained above, wherein the control unit 15 may also be integrated into the arithmetic unit 6. The regulation specifications 18 are used, in particular, for varying the precontrol 8 determined by the arithmetic unit 6 and thus for acting on the electrode pair 2 in accordance with the controlled precontrol 28.

Alternatively or additionally, it may be provided that the predefinable table 4 of the arithmetic unit 6 is varied or adjusted as a function of the control specifications 18, so that entries in the predefinable table 4 are overwritten.

In summary, the invention relates to a method for operating a filter system for filtering a solid particle having exhaust gas of a metallurgical plant, wherein the filter system comprises at least one electrode pair, each with an electrical power and / or an electrical voltage and / or an electric current can be acted upon. Furthermore, the invention relates to a system for operating such a filter system and a system for filtering an exhaust gas having a substance particles of a metallurgical plant, which comprises such a filter system. In order to provide a method or a device by means of which a solid particle the pointing exhaust gas of a metallurgical plant can be filtered in a resource-saving manner, the following method steps are proposed:

- Applying to the respective electrode pair according to the respective determined pilot control. Furthermore, this object is achieved by a system of the type mentioned above in that the system has a computing unit, by means of which a process phase of the metallurgical plant and a respective, dependent on the determined process phase pilot control of the respective electrode pair can be determined, wherein the respective determined feedforward control respective electrical power to be acted upon and / or a respective electrical voltage to be acted upon and / or a respective electrical current to be acted upon. Finally, this object is achieved by a system of the type mentioned above in that the system has such a system.

Claims

claims

1. A method for operating a filter system (1) for filtering a solid particle (10) having exhaust gas (11) of a metallurgical plant (12),

wherein the filter system (1) has at least one electrode pair (2), which can be acted upon in each case with an electrical power and / or an electrical voltage and / or an electric current,

characterized by the following process steps:

Determining a process phase (7) of the metallurgical plant (12),

- Determining a respective, depending on the determined process phase (7) feedforward control (8) of the respective pair of electrodes (2), wherein the respective detected feedforward control (8) to be acted upon electrical power and / or a respective voltage to be acted upon / or comprises a respective electrical current to be acted upon,

- Applying to the respective electrode pair (2) according to the respective detected pilot control (8).

2. The method according to claim 1,

wherein the metallurgical plant (12) has an automation system (13),

wherein the automation system (13) provides the process phase (7) of the metallurgical plant (12).

3. The method according to claim 2,

wherein the process phase (7) in each case in a change of

Process phase (7) of the metallurgical plant (12) is provided.

4. The method according to any one of the preceding claims, wherein the metallurgical plant (12) comprises a converter, wherein a position and / or a rotation angle of the converter is provided for determining the process phase (7) of the metallurgical plant (12).

5. The method according to any one of the preceding claims, wherein the filter system (1) comprises an input dust sensor (3), which is fluidically arranged in front of the at least one pair of electrodes (2) and by means of which an input concentration (30) of the solid particles (10 ) of the exhaust gas (11) flowing into the filter system (1) is detected, the process phase (7) of the metallurgical system (12) being determined on the basis of the detected input concentration (30).

6. The method according to any one of claims 1-4,

wherein the filter system (1) has an input dust sensor (3), which is fluidically arranged in front of the at least one electrode pair (2) and by means of which an input concentration (30) of the solid particles (10) of the filter system (1) flowing Exhaust gas (11) is detected, wherein the respective feedforward control (8) of the respective electrode pair (2) by means of a mathematical formula from the detected input concentration (30) is calculated.

7. The method according to any one of the preceding claims, wherein the respective feedforward control (8) of the respective electrode pair (2) by means of a predetermined table (4) is determined, in which a link between the determined process phase (7) and the respective electrical power to be acted upon and / or the respective electrical voltage to be acted upon and / or the respective electrical current to be acted upon.

8. The method according to any one of the preceding claims, wherein the filter system (1) has an output dust sensor (5), which is fluidically arranged after the at least one pair of electrodes (2) and by means of which an initial concentration (36) of the solid particles (10 ) of from the filter system (1) flowing exhaust gas (11) is detected,

wherein the respective feedforward control (8) of the respective electrode pair (2) is varied as a function of the detected output concentration (36).

9. The method according to claim 7 and 8,

wherein the varied feedforward control (8) is stored in the predefinable table (4).

10. The method according to claim 8 or 9,

wherein the respective pilot control (8) of the respective electrode pair (2) is varied such that a first predeterminable output concentration is not exceeded.

11. The method according to any one of claims 8-10,

wherein the respective pilot control of the respective electrode pair (2) is varied such that a second predetermined output concentration is not exceeded.

12. The method according to any one of the preceding claims, wherein the respective electrode pair (2) is acted upon according to a respective emergency feedforward with a respective electrical emergency power and / or a respective electrical emergency voltage and / or a respective electrical emergency power,

if the process phase (7) of the metallurgical plant (12) can not be determined,

and / or if appropriate, if the input dust sensor (3) and / or the output dust sensor (5) provides implausible measured values.

13. The method according to any one of the preceding claims, wherein the respective electrode pair (2) according to a respective stand-by pilot control with a respective electrical

Stand-by power and / or a respective electrical stand-by voltage and / or a respective electrical stand-by current is applied, if the metallurgical system (12) is operated for longer than a predefinable period of time in a stand-by state.

14. System for operating a filter system (1) for filtering a solid article (10) having exhaust gas (11) of a metallurgical plant (12),

wherein the filter system (1) has at least one pair of electrodes (2) which can be acted upon in each case with an electrical power and / or an electrical voltage and / or an electrical current,

marked by

a computing unit (6) by means of which a process phase (7) of the metallurgical plant (12) and a respective feedforward control (8) of the respective electrode pair (2) which is dependent on the determined process phase (7) can be determined, wherein the respectively determined feedforward control ( 8) comprises a respective electrical power to be acted upon and / or a respective electrical voltage to be acted upon and / or a respective electrical current to be acted upon.

15. System for filtering a substance particle (10) having exhaust gas (11) of a metallurgical plant (12) comprising:

- A filter unit (1) for filtering the solid particles (10) having exhaust gas of the metallurgical plant, wherein the filter system (1) has at least one electrode pair (2), each with an electrical power and / or an electrical voltage and / or an electrical Electricity can be applied,

marked by

a system according to claim 13.