EP0499138B1 - An assembly for controlling a voltage pulse feeder in a electrostatic precipitator - Google Patents

An assembly for controlling a voltage pulse feeder in a electrostatic precipitator Download PDF

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Publication number
EP0499138B1
EP0499138B1 EP92101961A EP92101961A EP0499138B1 EP 0499138 B1 EP0499138 B1 EP 0499138B1 EP 92101961 A EP92101961 A EP 92101961A EP 92101961 A EP92101961 A EP 92101961A EP 0499138 B1 EP0499138 B1 EP 0499138B1
Authority
EP
European Patent Office
Prior art keywords
voltage
direct voltage
base
pulse
generator
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.)
Revoked
Application number
EP92101961A
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German (de)
English (en)
French (fr)
Other versions
EP0499138A2 (en
EP0499138A3 (en
Inventor
Valerio Bogani
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.)
Enel SpA
Original Assignee
Enel SpA
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Publication date
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Application filed by Enel SpA filed Critical Enel SpA
Publication of EP0499138A2 publication Critical patent/EP0499138A2/en
Publication of EP0499138A3 publication Critical patent/EP0499138A3/en
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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

  • This present invention relates to an assembly for controlling a voltage pulse feeder in an electrostatic precipitator, in particular in an electrostatic precipitator in a coal combustion plant and, anyway, in a plant wherein particles are to be collected which have an high resistivity, from 108 ⁇ . cm and over.
  • the prior art comprises in said precipitators voltage pulse feeders (which will be referred to only as - feeder(s) - in the following description) by means of which the insulated electrode is given a negative polarity direct voltage of some tens of kV, to which direct voltage, voltage pulses are added which range from tens to hundreds of microseconds (»s) with a convenient frequency and peak values of some tens of kV (said negative polarity direct voltage will be referred to only as - base direct voltage - in the following description).
  • the voltage pulses having short life and proper voltage give the ash particles in the smokes remarkable electric charges, so that the electric field generated by the base direct voltage works to collect the particles by electrostatic action.
  • the prior art comprises feeders made according to two different assemblies :
  • the peculiarity of both said assemblies is to afford manually or automatically an independent control of the base direct voltage and voltage pulse amplitude.
  • document EP-A-0044488 discloses a procedure for operating a precipitator fed by variable direct voltage and superposed pulses wherein at least one of the parameters (pulse height, frequency, rise velocity) is variable, still wherein the direct voltage and/or one of the pulse parameters is iteratively varied in such a way that the sum of the electrical energies in the direct voltage and in the pulses as absorbed by the precipitator are lead to a minimum value in order to maintain a predetermined average value according to the amount of ashes in the gas. It appears that the scope of this invention is rather to minimize the energy without affording an efficiency improvement.
  • a drawback in the prior art is that the efficiency in collecting the solid particles is much jeopardized by unsteadyness of said voltages and, particularly after a discharge in a precipitator, is jeopardized on resetting the base direct voltage and the amplitude of the voltage pulses.
  • the base direct voltage and the pulse voltage added thereto are interdependent in other words, when one of said voltages rises the other lows, and vice versa.
  • the object of this invention is to obviate the low efficiency caused by said interdependency between said voltages in the assemblies according to the prior art.
  • the invention as characterized in the claims, provides an assembly which automatically keeps steady the base direct voltage on varying the pulse amplitudes added thereto and, similarly, automatically keeps steady the auxiliary direct voltage in order to generate the pulse on varying the base direct voltage.
  • This assembly works to generate the base current voltage and/or the pulse voltage irrespective of the control being manual or automatic.
  • Fig. 1 shows an assembly comprising: a feeder 1 comprising a base direct voltage generator 2; an auxiliary direct voltage generator 3 which generates voltage pulses; a precipitator 4 comprising an insulated filiform sender electrode 5, and a collecting electrode 6 for collecting solid particles; a couple of electronic controllers 7A, 7B made by the firm SIATEM in Padova (Italy) with components type L141 and » A747, respectively adapted to control automatically the base direct voltage and the auxiliary direct voltage for generating pulses and to balance for both voltages all the variations caused by said interdependency; a voltage divider 8 which shows continuously the value of the base direct voltage; a voltage divider 9 which shows continuously the value of the direct voltage associated with the voltage pulses; a voltage divider 10 which shows continuously the value of total voltage on the precipitator 4; wires 11A, 11B; 12A, 12B respectively connecting said generators with said electronic controllers 7A, 7B; wires 13A, 13B respectively connecting said generators with the voltage dividers 8, 9 and said send
  • the collecting highest efficiency in the electrostatic precipitator is obtained by setting and keeping steady a predetermined value of the base direct voltage selected depending on the amount and quality of the solid particles in the precipitator; to the base direct voltage a voltage pulse is added whose amplitude is increased gradually until a discharge occurs in the precipitator.
  • Said collecting voltage pulse shall be of low frequency, from 1 Hz to 50 Hz.
  • the base direct voltage and the pulse voltage are drawn to zero by the control assembly and, after a predetermined time period of some tens of milliseconds, the base direct voltage rapidly returns to the predetermined value, while the pulse voltage rapidly returns to that value which caused the discharge, reduced by a predetermined percentage, and then it increases along a low slope until a further discharge occurs in the precipitator.
  • Fig. 2 shows an assembly comprising:
  • Fig. 3 shows an assembly comprising
  • Fig. 4 is a diagram of an electronic controller which may be used for automatically keeping steady, in the illustrated case, the base direct voltage for the feeder as illustrated in Figures 1, 2 and 3.
  • a similar electronic controller is used for automatically keeping steady the auxiliary direct voltage associated with the pulses.
  • Said controller comprises:

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
  • Elimination Of Static Electricity (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Networks Using Active Elements (AREA)
EP92101961A 1991-02-15 1992-02-06 An assembly for controlling a voltage pulse feeder in a electrostatic precipitator Revoked EP0499138B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI910398 1991-02-15
ITMI910398A IT1245165B (it) 1991-02-15 1991-02-15 Sistema per controllare e regolare alimentatori ad impulsi di tensione per precipitatori elettrostatici

Publications (3)

Publication Number Publication Date
EP0499138A2 EP0499138A2 (en) 1992-08-19
EP0499138A3 EP0499138A3 (en) 1992-09-30
EP0499138B1 true EP0499138B1 (en) 1995-08-09

Family

ID=11358599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92101961A Revoked EP0499138B1 (en) 1991-02-15 1992-02-06 An assembly for controlling a voltage pulse feeder in a electrostatic precipitator

Country Status (7)

Country Link
EP (1) EP0499138B1 (da)
AT (1) ATE126100T1 (da)
DE (1) DE69203876T2 (da)
DK (1) DK0499138T3 (da)
ES (1) ES2079086T3 (da)
GR (1) GR3018054T3 (da)
IT (1) IT1245165B (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007014402A1 (en) * 2005-07-25 2007-02-01 Francoi Eberhardt Du Plessis Method of and control system for controlling electrostatic separator
US8552326B2 (en) * 2010-09-03 2013-10-08 Separation Technologies Llc Electrostatic separation control system
US9393573B2 (en) 2014-04-24 2016-07-19 Separation Technologies Llc Continuous belt for belt-type separator devices
US9764332B2 (en) 2015-02-13 2017-09-19 Separation Technologies Llc Edge air nozzles for belt-type separator devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007364A1 (de) * 1980-02-27 1981-09-10 Siemens AG, 1000 Berlin und 8000 München Steuerung fuer ein elektrofilter
DE3027172A1 (de) * 1980-07-17 1982-02-18 Siemens AG, 1000 Berlin und 8000 München Verfahren zum betrieb eines elektrofilters
DE3531025A1 (de) * 1985-08-30 1987-03-05 Bosch Gmbh Robert Schaltungsanordnung zur regelung der hochspannungsversorgung eines elektrostatischen filters

Also Published As

Publication number Publication date
ITMI910398A0 (it) 1991-02-15
DK0499138T3 (da) 1995-12-11
ITMI910398A1 (it) 1992-08-15
IT1245165B (it) 1994-09-13
DE69203876T2 (de) 1996-04-04
EP0499138A2 (en) 1992-08-19
ATE126100T1 (de) 1995-08-15
DE69203876D1 (de) 1995-09-14
ES2079086T3 (es) 1996-01-01
GR3018054T3 (en) 1996-02-29
EP0499138A3 (en) 1992-09-30

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