EP0561433B1 - Verfahren zur Entstaubung von Abgasen mit kritisch schwankendem CO-Gehalt - Google Patents

Verfahren zur Entstaubung von Abgasen mit kritisch schwankendem CO-Gehalt Download PDF

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Publication number
EP0561433B1
EP0561433B1 EP93200323A EP93200323A EP0561433B1 EP 0561433 B1 EP0561433 B1 EP 0561433B1 EP 93200323 A EP93200323 A EP 93200323A EP 93200323 A EP93200323 A EP 93200323A EP 0561433 B1 EP0561433 B1 EP 0561433B1
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EP
European Patent Office
Prior art keywords
content
exhaust gas
electrostatic separator
filter
bag filter
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.)
Expired - Lifetime
Application number
EP93200323A
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German (de)
English (en)
French (fr)
Other versions
EP0561433A1 (de
Inventor
Friedrich Enders
Jochim Eschenburg
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.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
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Filing date
Publication date
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Publication of EP0561433A1 publication Critical patent/EP0561433A1/de
Application granted granted Critical
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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
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/014—Addition of water; Heat exchange, e.g. by condensation
    • 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
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for

Definitions

  • the invention relates to a method for dedusting exhaust gases with a critically fluctuating CO content.
  • DE-OS 2459356 describes a device for treating gases which consists of a first filter device which has at least one highly efficient filter in the region of the inlet opening and a second filter device which has a solid-state matrix filter medium. A further device is arranged between the first and the second filter device, with which the gas is moved through the line from the inlet opening to the outlet opening.
  • the first filter device can consist of an electrostatic separator and a series-connected bag filter.
  • the bag filter increases the effectiveness of the filtration and provides a reserve device for the electrostatic precipitator, so that the operation of the system can be continued when the filter is removed for cleaning.
  • the bag filter thus also helps to keep particles out of the system when the electrostatic precipitator is out of operation, for example in the event of a power failure.
  • the invention has for its object to provide a method for dedusting exhaust gases with a critically fluctuating CO content, which ensures dedusting of the exhaust gas even if the operation of an electrostatic precipitator due to an excessive CO content has to be avoided.
  • the object on which the invention is based is achieved by a method for dedusting exhaust gases with a critically fluctuating CO content, in which the exhaust gas is passed through an electrostatic precipitator which up to a CO content A of the exhaust gas of max. 9 vol .-% is operated and is switched off when the CO content A of the exhaust gas is exceeded and in which the exhaust gas up to a CO content A of max. 9 vol.% Is fed to a chimney arranged behind the electrostatic precipitator and in which the exhaust gas is passed through an additional bag filter when the CO content A is exceeded and is subsequently fed to the chimney.
  • the critically fluctuating CO content is 0.1 to 15% by volume.
  • a preferred embodiment of the invention is that a CO content A of 2 to 6 vol .-% is selected. If a CO content A of 2 to 6 vol.% Is selected, the electrostatic precipitator is particularly safe to operate.
  • JP-A-60-31844 describes a method for cleaning the exhaust gases from steel furnaces, in which a bag filter operating with static electricity is installed in the flow path of the exhaust gas of the steel furnaces, boilers or gas coolers in question. Depending on the exhaust gas conditions, the electrostatic charge of the electrostatic bag filter is varied during operation.
  • JP-A-58-122059 describes an electrostatically operating bag filter, the tubes of which consist of an electrically conductive filter fabric. A spray electrode is installed in the middle of each filter bag.
  • Another preferred embodiment of the invention is that the exhaust gas is passed through an evaporative cooler before entering the electrostatic precipitator.
  • the temperature of the exhaust gas is kept below 200 ° C., so that relatively inexpensive filter bags can be arranged in the additional bag filter.
  • the additional bag filter is arranged in the electrostatic separator. This measure enables the method for dedusting exhaust gases with a critically fluctuating CO content to be carried out particularly cost-effectively, since system parts, such as, for example, pipes and some discharge devices for the separated dust, can be saved.
  • the additional bag filter is arranged in the gas outlet connection of the electrostatic separator.
  • the additional bag filter can be installed in a relatively simple manner in already existing electrostatic precipitators, so that the existing electrostatic precipitators can be retrofitted relatively easily.
  • a multi-field, electrostatic separator is arranged as an electrostatic separator, and at least some of the filter bags of the additional bag filter are arranged between at least two fields of the electrostatic separator. If an electrostatic separator is arranged as a multi-field electrostatic separator and at least part of the filter bags of the additional bag filter are arranged between at least two fields of the electrostatic separator, then a subsequent installation of the additional bag filter can be carried out in a particularly simple manner, since at least some of the filter bags can be arranged in the housing of the electrostatic precipitator without the housing having to be structurally changed with great effort.
  • Another embodiment of the invention is that the filter bags are arranged at a distance from one another of 50 to 1000 mm. This measure ensures that the filter bags arranged in the electrostatic separator do not have a disadvantageous effect on the pressure loss of the system when the electrostatic separator is in operation.
  • the method for dedusting exhaust gases that are produced during cement production is used.
  • the use of the method for dedusting exhaust gases that are produced in cement production is particularly advantageous since the exhaust gases that are produced in cement production have relatively strongly fluctuating CO contents, so that the electrostatic precipitator due to the excess of the CO content A of the exhaust gas of max. 9 vol .-% must be switched off relatively often.
  • Fig. 1 shows a simplified flow diagram of a process according to which it is provided to arrange the electrostatic precipitator and the additional bag filter separately from one another.
  • Fig. 2 shows a simplified flow diagram of a process according to which it is provided to arrange the additional bag filter in the gas outlet port of the electrostatic precipitator.
  • Fig. 3 shows a simplified flow diagram of a process according to which it is provided to arrange the filter bags of the additional bag filter between two fields of an electrostatic precipitator.
  • Fig. 1 the procedure is shown, according to which it is provided to arrange the electrostatic precipitator and the additional bag filter separately from each other.
  • the dust-containing exhaust gas (1) is passed through the electrostatic separator (2), which up to a CO content A of the exhaust gas of max. 9 vol .-% is operated. If the CO content A of the exhaust gas of max. Not exceeding 9% by volume, the dust-containing exhaust gas (1) is dedusted in the electrostatic separator (2) and fed to the chimney (5) via the blower (3), the shut-off device (4) and the line (13).
  • the shut-off device (8) is closed and the fan (10) is not in operation.
  • the resulting dust is fed to a dust collecting device (6) and discharged via a discharge device (7) and via a line (12).
  • the electrostatic precipitator (2) is switched off, the shut-off device (4) is closed and the shut-off device (8) is opened.
  • the dust-containing exhaust gas (1) passes through the shut-off device (8) to the additional bag filter (9), in which the filter bags (9 ') are arranged.
  • the dedusted exhaust gas then reaches the chimney (5) via the fan (10) and via line (13).
  • the blower (3) can be designed so that the blower (10) can be dispensed with if the blower (3) is arranged behind the shut-off device (4) in line (13). If the exhaust gas (1) to be dedusted is passed through the additional bag filter (9), the resulting dust is discharged via a discharge device (11) and via line (12).
  • Fig. 2 the procedure is shown, according to which it is provided to arrange the additional bag filter in the gas outlet port of the electrostatic precipitator.
  • the exhaust gas (1) to be dedusted is passed through the electrostatic separator (2), which up to a CO content A of the exhaust gas of max. 9 vol .-% is operated. If the CO content A of the exhaust gas of max. If the volume does not exceed 9% by volume, the dedusted exhaust gas reaches the chimney (5) via the shut-off device (4) and the blower (3) as well as via the line (13).
  • the fan (10) is not in operation.
  • the resulting dust is fed to a dust collecting device (6) and removed via a discharge device (7). If the CO content A of the exhaust gas of max.
  • the electrostatic precipitator (2) is switched off and the shut-off device (4) is closed.
  • the exhaust gas (1) to be dedusted is passed through the additional bag filter (9) which is arranged with the filter bags (9 ') in the gas outlet port of the electrostatic precipitator (2).
  • the dedusted exhaust gas is fed to the chimney (5) via the operated fan (10) and via the line (13). In this procedure, too, the resulting dust is fed to the dust collecting device (6) and removed via the discharge device (7).
  • FIG 3 shows the procedure according to which it is intended to use a two-field electrostatic separator and to arrange the filter bags between the two fields of the electrostatic separator.
  • the dust-containing exhaust gas (1) is passed into the electrostatic separator (2), which has two fields (2a, 2b). If the CO content A of the exhaust gas (1) is max. 9 vol .-% not exceeded, the dedusted exhaust gas is fed via the shut-off device (4) and the blower (3) to the line (13). The fan (10) is not in operation. If the CO content A of the exhaust gas (1) is max. 9 vol .-% exceeded, the electrostatic precipitator (2) is switched off and the shut-off device (4) is closed. The exhaust gas (1) to be dedusted is passed through the bag filter (9) with the filter bags (9 ') and reaches the line (13) via the blower (10). In both methods, the separated dust is fed to a dust collecting device (6) and removed via a discharge device (7).
  • the amount of exhaust gas from a cement clinker combustion plant is 300000 m3 / h, the exhaust gas having a temperature of 150 ° C and a raw gas dust content of 100 g / m3.
  • the exhaust gas is passed through a two-field electrostatic precipitator according to FIG. 3, which up to a CO content A of the exhaust gas of max. 3 vol .-% is operated.
  • a bag filter consisting of 116 filter bags, each 7 m long, is placed between the two fields. If the CO content A of the exhaust gas of max. 3 vol .-% not exceeded, the exhaust gas is dedusted in the electrostatic precipitator, the clean gas dust content being 50 mg / m3 tr .
  • the clinker burning system and the electrostatic precipitator are switched off. This reduces the amount of exhaust gas to 30,000 m3 / h per hour.
  • the shut-off device is closed behind the gas outlet connection of the electrostatic separator and the exhaust gas to be dedusted is passed over the additional bag filter which is arranged between the two fields of the electrostatic separator. With this procedure, the clean gas dust content is also 50 mg / m3 tr .
  • the filter hoses are cleaned with air under 3 bar, 22 l air per flush and filter hose being fed to each filter hose opposite to the flow direction of the exhaust gas.
  • Fresh air is passed through the clinker combustion plant until the CO content of the exhaust gas has fallen below 2% by volume. Then the clinker burning system and the electrostatic separator are put into operation again and the exhaust gas is dedusted again in the electrostatic separator, the filter tubes of the bag filter arranged between the fields of the electrostatic separator being washed around by the exhaust gas to be dedusted.
  • the dust accumulating in the electrostatic precipitator is advantageously returned to the clinker burning system.

Landscapes

  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electrostatic Separation (AREA)
EP93200323A 1992-03-14 1993-02-05 Verfahren zur Entstaubung von Abgasen mit kritisch schwankendem CO-Gehalt Expired - Lifetime EP0561433B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208204A DE4208204C1 (enrdf_load_stackoverflow) 1992-03-14 1992-03-14
DE4208204 1992-03-14

Publications (2)

Publication Number Publication Date
EP0561433A1 EP0561433A1 (de) 1993-09-22
EP0561433B1 true EP0561433B1 (de) 1996-04-03

Family

ID=6454074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200323A Expired - Lifetime EP0561433B1 (de) 1992-03-14 1993-02-05 Verfahren zur Entstaubung von Abgasen mit kritisch schwankendem CO-Gehalt

Country Status (2)

Country Link
EP (1) EP0561433B1 (enrdf_load_stackoverflow)
DE (2) DE4208204C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2316576T3 (pl) * 2009-10-28 2013-10-31 General Electric Technology Gmbh Hybrydowy układ kolektora cząstek pyłu

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE455680C (de) * 1924-04-23 1928-02-07 Paul Kirchhoff Verfahren zur Verhuetung von Schlotbraenden bei elektrischen Gasreinigern
US3733784A (en) * 1971-10-05 1973-05-22 Air Preheater Electro-bag dust collector
DE2459356A1 (de) * 1973-12-17 1975-06-19 Sayer William J Vorrichtung zur behandlung von stroemungsmitteln
EP0294658B1 (en) * 1987-05-30 1993-01-27 Ebara Corporation Process for treating effluent gas
US5024681A (en) * 1989-12-15 1991-06-18 Electric Power Research Institute Compact hybrid particulate collector

Also Published As

Publication number Publication date
DE4208204C1 (enrdf_load_stackoverflow) 1993-03-18
EP0561433A1 (de) 1993-09-22
DE59302085D1 (de) 1996-05-09

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