EP0569838A1 - Procédé de mise en oeuvre et dispositif pour un filtre électrostatique - Google Patents

Procédé de mise en oeuvre et dispositif pour un filtre électrostatique Download PDF

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Publication number
EP0569838A1
EP0569838A1 EP93107273A EP93107273A EP0569838A1 EP 0569838 A1 EP0569838 A1 EP 0569838A1 EP 93107273 A EP93107273 A EP 93107273A EP 93107273 A EP93107273 A EP 93107273A EP 0569838 A1 EP0569838 A1 EP 0569838A1
Authority
EP
European Patent Office
Prior art keywords
control unit
control
unit
monitoring unit
operating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93107273A
Other languages
German (de)
English (en)
Inventor
Norbert Dipl.-Ing. Grass
Gerhard Dipl.-Ing. Dönig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0569838A1 publication Critical patent/EP0569838A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor

Definitions

  • the present invention relates to a guiding method and a guiding system for an electrostatic filter according to the preambles of claims 1 and 10.
  • Such a method and such a system are known for example from DE-OS 41 08 811. However, nothing is said about the type of communication or the type of connection between the control unit and the operating and monitoring unit.
  • the object of the present invention is therefore to provide a guiding method or a guiding system for an electrostatic precipitator, which enables the electrostatic precipitator to be guided safely and conveniently for the user from the operating and monitoring unit.
  • control unit assumes control of the communication between the control unit and the control and monitoring unit in that the control and monitoring unit waits for signals from the control unit with each communication.
  • the data transmission from the control unit to the operating and monitoring unit is preferably carried out in blocks, while conversely the data transmission from the operating and monitoring unit to the control unit takes place in bytes.
  • the fastest possible data transmission is achieved during data transmission to the operating and monitoring unit, while conversely during data transmission to the control unit, the brief interruption of the control of the power supply device for communication purposes remains tolerable.
  • the operating and monitoring unit is located at a location which is convenient for the user, e.g. can be arranged in the control room of a power plant, and nevertheless safe operation of the communication devices between the control unit and the operating and monitoring unit is ensured in the event of filter breakdowns which can cause considerable electromagnetic interference.
  • control unit is designed to process a program regulating the communication, it is ensured, analogously to claim 1, that the control unit is only burdened with communication tasks if it is not too heavily burdened with control tasks. In particular, the control unit must have a sufficiently large computing power to be able to perform both tasks.
  • optical waveguides are particularly suitable for data transmission in rough industrial operations because, with the appropriate sheathing, they can withstand the random mechanical stresses of rough industrial operations.
  • control unit has electrically erasable and overwritable read-only memories for storing the control program, not only control parameters can be specified for the control unit by the control and monitoring unit, but the control program itself can also be changed by the control and monitoring unit.
  • control unit 1 is arranged in the control cabinet 2.
  • the power supply device (not shown), ie the power electronics on the primary side, which is guided by the control unit 1, is generally also arranged.
  • the power supply device supplies an electrostatic filter, also not shown, with electrical energy.
  • the power supply device essentially corresponds to the intermediate circuit converter described in the earlier European application 92 100 880.1.
  • the control unit 1 operates essentially independently. It essentially corresponds to the self-optimizing control described in the earlier European application 92 104 314.7.
  • the control unit 1 is connected to the operating and monitoring unit 3 (hereinafter referred to as BuB unit) for specifying higher-level control parameters and for general control of the electrostatic precipitator (recording of characteristic curves, switching the electrostatic precipitator on and off).
  • the BuB unit 3 is typically a personal computer, e.g. an industrial PC.
  • the BuB unit 3 is typically arranged in the control room of a power plant (not shown), but in principle it can also be arranged elsewhere.
  • Communication between control unit 1 and BuB unit 3 typically takes place via a serial interface, e.g. an RS 232.
  • a serial interface e.g. an RS 232.
  • the RS 232 interface of the control unit 1 is connected to the conversion unit 4 and the RS 232 interface of the BuB unit 3 is connected to the conversion unit 5.
  • the conversion units 4, 5 are connected to one another via the optical waveguide 6.
  • the optical waveguide 6 can be a plastic optical fiber or a glass fiber optical fiber, depending on the distance to be bridged.
  • the data transmission via the optical waveguide 6 takes place in full duplex operation with the relatively high data rate of 9600 baud.
  • electrostatic filters are thus included in the overall management of technical processes, for example in the overall management of a power plant.
  • This inclusion has so far been refrained from, since inclusion is not appeared necessary (the filtering of the exhaust gases was a self-contained, independent process) and problems with data transmission due to electromagnetic interference and potential jumps in filter breakdowns were feared.
  • the use of fiber optic cables also shrank back because it was believed that fiber optic cables would not be able to cope with use in rough industrial operations, especially not mechanical loads (kinking, running over, ).
  • optical waveguides can withstand the harsh conditions in industrial operation with the appropriate cladding.
  • the use of optical fibers not only results in a galvanic separation of the conversion units 4, 5, but also in a signal transmission which is very robust and less susceptible to interference from electromagnetic interference. This avoids the risk that the filter units 4, 5 will be destroyed in the event of filter breakdowns due to the potential jumps that then occur. Furthermore, the risk that when switching off the power supply z. B. after a filter breakdown, the data transmission is disturbed.
  • control unit 1 is primarily responsible for controlling the power supply device. As process control, this control naturally has priority over communication with BuB unit 3. Communication between control unit 1 and BuB unit 3 therefore takes place via telegrams, which are transmitted in the following way: If data are to be transmitted from the BuB unit 3 to the control unit 1, the BuB unit 3 sends a byte to the control unit 1. The control unit 1 receives the byte and sends back an acknowledgment signal, that is to say a handshake. The BuB unit 3 only sends the next byte when it has received the acknowledgment signal from the control unit 1. If the BuB unit 3 has not received an acknowledgment signal within a preselectable period of time, for example 100 ms, it repeats the transmission of the byte.
  • a preselectable period of time for example 100 ms
  • the data transmission from the BuB unit 3 to the control unit 1 thus takes place in bytes, the BuB unit 3 waiting for acknowledgment signals from the control unit 1.
  • a connection is first established in a manner known per se by means of mutual handshakes. After the connection has been established, the BuB unit 3 waits for the data from the control unit 1. The control unit 1 sends the data to be transmitted in blocks at a time at which it is not currently loaded with control tasks.
  • a checksum is transmitted, by means of which 3 transmission errors can be determined by the BuB unit. If no transmission error is found, the correct receipt of the data is acknowledged, the data accepted as valid and processed further in the BuB unit 3. If a transmission error is found, the retry of the data transmission is requested. Even then, the BuB unit 3 waits until the control unit 1 retransmits the data block.
  • the data transmission from the control unit 1 to the BuB unit 3 thus takes place in blocks, the BuB unit 3 also waiting for signals from the control unit 1 here.
  • the data transfer takes place in a fault-tolerant code, i.e. a code that allows not only the detection, but also the correction of transmission errors.
  • a fault-tolerant code i.e. a code that allows not only the detection, but also the correction of transmission errors.
  • the individual characters transmitted have e.g. a Hamming distance of 4 so that 1-bit errors can be corrected and 2-bit errors can be recognized.
  • control parameters transmitted from the BuB unit 3 to the control unit 1 are first stored temporarily in the control unit 1 and checked for plausibility before they are accepted by the control unit 1 as valid.
  • the control unit 1 is known, for example, that the power supply device can be operated with a maximum filter current of 1.5 A. If the BuB unit 3 of the control unit 1 now transmits a value of 2A for the filter current, this error can be recognized in the control unit 1.
  • the control unit 1 can react to such an error in two ways: it can ignore the change in the filter current or it can apply the next permissible filter current, here 1.5 A.
  • control unit 1 transmits the current values of filter voltage and filter current as well as other information relevant to the user cyclically, for example every 5 seconds. eg to the BuB unit 3 via filter breakdowns, filter short-circuits, the transformer temperature or component failures.
  • the BuB unit 3 practically always has the current information about the state of the electrostatic filter and the power supply device of the electrostatic filter.
  • the BuB unit 3 is thus able to constantly log the relevant information about the electrostatic filter.
  • a filter characteristic should be recorded automatically by the BuB unit 3 or manually initiated by the operator of the system to be operated.
  • a corresponding command and associated parameters are sent from control unit 3 to control unit 1.
  • the parameters can, for example, indicate the current range within which the filter characteristic is to be recorded, e.g. from 0.8 to 1.4 A.
  • the control unit 1 then records a filter characteristic in a manner known per se and sends the measured data as a block to the unit 3.
  • the filter characteristic is displayed and evaluated in the BuB unit 3 on a graphics-capable monitor.
  • the result of the evaluation can e.g. be that the control parameters of control unit 1 must be changed. In this case, new control parameters are transmitted to control unit 1 from control unit 3 to control unit 1 as described above.
  • control unit 1 has electrically erasable and overwritable read-only memories in which the control program is stored.
  • electrically erasable and overwritable read-only memories is possible because, surprisingly, despite filter breakdowns and electromagnetic interference, the data can also be safely stored in these memories.
  • the change of the control program can e.g. happen that there are two EEPROMs, only one being accessed to control the electrostatic precipitator.
  • the second EEPROM is basically redundant.
  • the new control program is written into the second EEPROM, which is currently not being accessed.
  • the other EEPROM is then immediately accessed. In this way, the control program can be changed without interfering with the current control.
  • EEPROMs electrically erasable and overwritable read-only memories
  • Flash EPROMs or buffered RAMs.
  • the BuB unit 3 not firmly connected to the control unit 1, but optionally connectable.
  • the RS 232 interface of the BuB unit 3 can be connected to the telephone network 8 via a modem 7.
  • the control unit 1 is connected to the conversion unit 41 with its RS 232 interface as before.
  • the converting unit 4 ' is connected to the converting unit 4''via the optical waveguide 6'.
  • the conversion unit 4 ′′ is connected to the modem 9, which can also be connected to the telephone network 8.
  • the modems 7, 9 are preferably designed as integrated circuits, so-called modem chips.
  • the modem 7 is integrated directly into the control unit 1.
  • the coupling via the conversion units 4 ', 4' 'and the optical waveguide 6' can be omitted.
  • the telephone network 8 and the control unit 1 are then galvanically connected to one another. Possible problems due to the galvanic connection are avoided, however, if the control unit 1 is connected to the telephone network 8 via a transformer (not shown) and a protective circuit which is known per se and also not shown.
  • control unit 1 can be connected practically worldwide to any computer that has a modem connection.
  • This configuration is particularly suitable if unforeseen disturbances occur during the operation of the electrostatic precipitator. This is because error diagnosis and error correction can be carried out remotely. This eliminates expensive travel costs from specialists for on-site investment.
  • the pre-programmed telephone number can e.g. the number of the computer of the manufacturer of the electrostatic precipitator.
  • the present invention not only enables the guidance of an electrostatic filter to be integrated in an overall system, but also the possibility of error diagnosis and error correction from a distance. Furthermore, the present invention makes it possible to use a graphical user interface for controlling the electrostatic filter. The user is therefore offered the convenience of controlling the electrostatic filter, which he is familiar with and familiar from graphics-capable PCs.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
EP93107273A 1992-05-15 1993-05-05 Procédé de mise en oeuvre et dispositif pour un filtre électrostatique Withdrawn EP0569838A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4216206 1992-05-15
DE4216206 1992-05-15

Publications (1)

Publication Number Publication Date
EP0569838A1 true EP0569838A1 (fr) 1993-11-18

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ID=6459036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107273A Withdrawn EP0569838A1 (fr) 1992-05-15 1993-05-05 Procédé de mise en oeuvre et dispositif pour un filtre électrostatique

Country Status (1)

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EP (1) EP0569838A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003086638A1 (fr) * 2002-04-17 2003-10-23 Siemens Aktiengesellschaft Transmission de valeurs mesurees lors de l'alimentation haute tension d'electrofiltres
US7736418B2 (en) * 2004-07-26 2010-06-15 Siemens Aktiengesellschaft Control device and control method for an electrostatic filter with a configurable number of parallel and serial filter zones
CN115646655A (zh) * 2022-11-03 2023-01-31 华能烟台八角热电有限公司 电除尘能量管理系统调试方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035209A1 (fr) * 1980-02-27 1981-09-09 Metallgesellschaft Ag Procédé d'exploitation d'un électrofiltre
GB2144003A (en) * 1983-07-25 1985-02-20 Belco Pollution Control Corp Power supply for electrostatic precipitator
WO1991015297A1 (fr) * 1990-04-04 1991-10-17 Siemens Aktiengesellschaft Procede de regulation du dispositif d'alimentation en courant d'un filtre electrique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035209A1 (fr) * 1980-02-27 1981-09-09 Metallgesellschaft Ag Procédé d'exploitation d'un électrofiltre
GB2144003A (en) * 1983-07-25 1985-02-20 Belco Pollution Control Corp Power supply for electrostatic precipitator
WO1991015297A1 (fr) * 1990-04-04 1991-10-17 Siemens Aktiengesellschaft Procede de regulation du dispositif d'alimentation en courant d'un filtre electrique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003086638A1 (fr) * 2002-04-17 2003-10-23 Siemens Aktiengesellschaft Transmission de valeurs mesurees lors de l'alimentation haute tension d'electrofiltres
US7366369B2 (en) 2002-04-17 2008-04-29 Siemens Aktiengesellschaft Transmission of measured values in high-voltage supply units for electrofilters
US7736418B2 (en) * 2004-07-26 2010-06-15 Siemens Aktiengesellschaft Control device and control method for an electrostatic filter with a configurable number of parallel and serial filter zones
CN115646655A (zh) * 2022-11-03 2023-01-31 华能烟台八角热电有限公司 电除尘能量管理系统调试方法

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