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

Patent metadata

Field	Value
Publication number	US-2016279646-A1
Application number	US-201415036003-A
Country	US
Kind code	A1
Filing date	Nov 6, 2014
Priority date	Nov 13, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

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. A system for operating such a filter system includes ( 1 ) a plant for filtering an exhaust gas ( 11 ) of a metallurgical plant ( 12 ). The exhaust gas ( 11 ) includes solid particles ( 10 ). The metallurgical plant ( 12 ) includes such a filter system ( 1 ). In order to filter an exhaust gas ( 11 ) of a metallurgical plant ( 12 ), which exhaust gas ( 11 ) comprises solid particles ( 10 ), in a resource-saving manner, method steps include: 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 ) includes 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 ).

First claim

1 . A method for operating a filter system for filtering an exhaust gas of a metallurgical plant;
wherein the exhaust gas contains solid particles;
wherein the filter system includes at least one electrode pair and an electrical power and/or an electrical voltage and/or an electrical current may be applied to each of the electrodes;
method comprising steps of:
attempting to identify a process phase of the metallurgical plant;
if the process phase is identified, determining a respective feedforward of the respective electrode pair, wherein the determined feedforward is dependent on the identified process phase, the respective determined feedforward comprises a respective electrical power and/or a respective electrical voltage and/or a respective electrical current to be applied; and
applying the respective electrical power and/or electrical voltage and/or electrical current to the respective electrode pair in accordance with the respective determined feedforward; and
if the process phase cannot be identified, applying a respective emergency electrical power and/or a respective emergency electrical voltage and/or a respective emergency electrical current to the respective electrode pair in accordance with a respective emergency feedforward.

2 . The method as claimed in claim 1 , wherein the metallurgical plant has an automation system, configured to provide the process phase of the metallurgical plant.

3 . The method as claimed in claim 2 , further comprising providing the process phase when there is a change in the process phase of the metallurgical plant.

4 . The method as claimed in claim 1 , wherein the metallurgical plant includes a converter, wherein a position and/or a rotation angle of the converter are/is provided for identifying the process phase of the metallurgical plant.

5 . The method as claimed in claim 1 , wherein the filter system includes an input dust sensor arranged fluidically upstream of the at least one electrode pair;
the method further comprising: measuring an input concentration of the solid particles in the exhaust gas flowing into the filter system by operating the input dust sensor; and identifying the process phase of the metallurgical plant on the basis of the measured input concentration.

6 . The method as claimed in claim 1 , wherein the filter system includes an input dust sensor arranged fluidically upstream of the at least one electrode pair;
the method further comprising: measuring an input concentration of the solid particles in the exhaust gas flowing into the filter system by operating the input dust sensor; and calculating the respective feedforward of the respective electrode pair based on measured input concentration by means of a mathematical formula.

7 . The method as claimed in claim 1 , further comprising:
determining the respective feedforward of the respective electrode pair by a predefinable table in which a link between the identified process phase and the respective electrical power and/or electrical voltage and/or electrical current to be applied is stored.

8 . The method as claimed in claim 1 , wherein the filter system includes an output dust sensor arranged fluidically downstream of the at least one electrode pair;
measuring an output concentration of the solid particles in the exhaust gas flowing out of the filter system with the output dust sensor; and varying the respective feedforward of the respective electrode pair as a function of the measured output concentration.

9 . The method as claimed in claim 7 , further comprising storing the varied feedforward is stored in the predefinable table.

10 . The method as claimed in claim 8 , further comprising varying the respective feedforward of the respective electrode pair such
that a predefinable upper output concentration is not exceeded.

11 . The method as claimed in claim 8 , further comprising varying the respective feedforward of the respective electrode pair such that a predefinable lower output concentration is not undershot.

12 . The method as claimed in claim 1 , further comprising:
measuring values of an input dust sensor which is arranged fluidically upstream of the at least one electrode pair to measure an input concentration of the solid particles in the exhaust gas flowing into the filter system; and/or measuring values of an output dust sensor which is arranged fluidically downstream of the at least one electrode pair to measure an output concentration of the solid particles in the exhaust gas flowing out of the filter system; evaluating the measured values within the scope of the attempt to identify the process phase, and wherein the process phase is rated as not identifiable if the input dust sensor and/or the output dust sensor deliver/delivers unreliable measured values.

13 . The method as claimed in claim 1 , further comprising operating an emergency feedforward such that the respective electrode pair is operated as during that process phase during which the exhaust gas contains a maximum of solid particles and to achieve a greatest filtering effect.

14 . The method as claimed in claim 1 , further comprising applying a respective standby electrical power and/or standby electrical voltage and/or standby electrical current to the respective electrode pair in accordance with a respective standby feedforward if the metallurgical plant is operated in a standby state for longer than a predefinable period of time.

15 . A system for operating a filter system for filtering an exhaust gas of a metallurgical plant, wherein the exhaust gas contains solid particles, the system comprising:
the filter system comprising at least one electrode pair, to each electrode of the at least one pair, an electrical power and/or an electrical voltage and/or an electrical current can be applied; a computing unit configured for identifying a process phase of the metallurgical plant and a respective feedforward of the respective electrode pair, wherein for determining the respective feedforward which is dependent on the identified process phase, wherein the respective determined feedforward comprises a respective electrical power and/or a respective electrical voltage and/or a respective electrical current to be applied; and wherein the computing unit is embodied to apply a respective emergency electrical power and/or a respective emergency electrical voltage and/or a respective emergency electrical current to the respective electrode pair in accordance with a respective emergency feedforward if the process phase cannot be identified.

16 . A plant for filtering an exhaust gas of a metallurgical plant, which exhaust gas contains solid particles, the plant comprising:
a filter system for filtering the exhaust gas of the metallurgical plant, which exhaust gas contains solid particles; wherein the filter system has at least one electrode pair, to each of which an electrical power and/or an electrical voltage and/or an electrical current can be applied; and a system as claimed in claim 15 .

17 . The method as claimed in claim 8 , further comprising storing the varied feedforward is stored in the predefinable table.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Aufreiter Philipp
• Fleischanderl Johann
• Hartl Franz
• Keusch Thomas
• Lehofer Martin
• Rohrhofer Andreas
• Wackerle Florian
• Weinzinger Michael

Classifications

• B03C2201/24

  for measuring or calculating of parameters, e.g. efficiency · CPC title

• G05B13/021

  in which a variable is automatically adjusted to optimise the performance · CPC title

• B03C3/68 Primary

  Control systems therefor {(electricity supply or control systems for cleaning the electrodes B03C3/746, B03C3/763)} · CPC title