EP0331243B1 - Procédé d'augmentation du rendement de précipitation d'électrofiltres - Google Patents

Procédé d'augmentation du rendement de précipitation d'électrofiltres Download PDF

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Publication number
EP0331243B1
EP0331243B1 EP89200441A EP89200441A EP0331243B1 EP 0331243 B1 EP0331243 B1 EP 0331243B1 EP 89200441 A EP89200441 A EP 89200441A EP 89200441 A EP89200441 A EP 89200441A EP 0331243 B1 EP0331243 B1 EP 0331243B1
Authority
EP
European Patent Office
Prior art keywords
coke
sintering
dust
branched
suction boxes
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
EP89200441A
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German (de)
English (en)
Other versions
EP0331243A1 (fr
Inventor
Hermann Schmidt
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
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 Metallgesellschaft AG filed Critical Metallgesellschaft AG
Priority to AT89200441T priority Critical patent/ATE77062T1/de
Publication of EP0331243A1 publication Critical patent/EP0331243A1/fr
Application granted granted Critical
Publication of EP0331243B1 publication Critical patent/EP0331243B1/fr
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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
    • 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
    • B03C3/013—Conditioning by chemical additives, e.g. with SO3

Definitions

  • the invention relates to a method for improving the separation performance of electrostatic precipitators in sintering plants - consisting essentially of storage containers and transport devices for iron ore, lime, coke and grit, and a driven, rotating sintering belt with a plurality of suction boxes arranged underneath, a suction fan with an upstream electrostatic precipitator for the exhaust gases from the sintering belt, a screening device and an induced draft fan with an upstream electrostatic precipitator for room dust removal - by adding a fine-grained solid conditioning agent to the exhaust gas flow.
  • non-conductive dusts from gases or air should be able to be separated electrostatically if the gases or the air are mixed with "powdered fuel grits". This is understood to mean the solid particles that escape with the exhaust gas from coal-dust-fired boilers and are separated in electrostatic filters. So it is fly ash, which can still contain 3 to 70% unburned coal (page 3, lines 68 to 82 and claim 1).
  • this object could be achieved by a combination of measures.
  • the coke powder available as fuel for the sintering process was chosen as the conditioning agent. Of the Total amount of fuel is diverted from 0.5 to 5%. ground separately and introduced into the exhaust gases of the sintering belt via one of the suction boxes. This amount of coke is then separated off with the dust in the electrostatic filter and then returned to the sintering process.
  • the amount of air extracted for room dust removal is also to be conditioned, at least 2% of the amount of coke breeze required as fuel can be branched off and ground separately. Part of this amount of coke is placed in one of the suction boxes of the sintering belt and the other part in the suction line for the dust removal. In this case, about 20% of the branched coke quantity is introduced into one of the suction boxes of the sintering belt. Finally, it is provided that the branched-off amount of coke breeze is ground to an average grain size d 50 of 2 to 20 ⁇ m.
  • the invention is based on various considerations which, taken together, enable an advantageous solution to the problem set.
  • a special conditioning agent which achieves a first economic advantage.
  • a grain size that is favorable for the conditioning is set, so that the branched-off amount of coke greens can be kept relatively small and the effort for their additional treatment compared to normal use as a fuel is hardly significant.
  • the conditioning agent deposited with the dust can be recycled practically 100% into the sintering process and used there as fuel.
  • there are therefore no additional costs for the conditioning agent itself This shows a way how a significant improvement in the separation performance can be achieved with very little additional effort (pipes, coke mill, grinding work).
  • the coke consumption is 263 t per day.
  • the amount of exhaust gas from the sintered belt is 550,000 Nm 3 / h with a dust content of 2 g / m 3 . From this, the daily amount of dust is 26.4 t. If you calculate with 10% conditioning agent based on this amount of dust, 2.6 t of coke must be branched off daily, ground separately and placed in one of the suction boxes of the sintering belt. In relation to the daily coke consumption, this is not more than 1%.
  • the dust content in the clean gas can increase from 420 to 173 mg / Nm 3 can be reduced, which corresponds to a reduction of the residual dust content by almost 60%.
  • the amount of coke branched off as the conditioning agent must be larger or smaller. You can also influence the separation efficiency via the fineness of grinding. In terms of costs, only the grinding work plays a role, because the coke powder finely ground as a conditioning agent can be fully used as fuel for the sintering process.
  • FIG. 1 The flow diagram of a sintering plant is shown in a highly simplified and schematic manner in FIG.
  • the sintering plant shown in simplified form, essentially consists of storage containers (3 to 6) and transport devices (13 to 16) for iron ore (4, 14), lime (5.15), coke (6, 16) and return material (3, 13), a driven, revolving sintering belt (1) which is supplied with the sintering mixture via the line (17).
  • a driven, revolving sintering belt (1) which is supplied with the sintering mixture via the line (17).
  • the sintered material is transported via line (18) to the screening device (7), from which the finished sintered product is drawn off via line (19).
  • an induced draft fan (12) with an upstream electrostatic filter (11) is provided for the dust removal.
  • hoods (10) - only one shown - are arranged at all points with dust formation, from which the exhaust air is sucked off via the line (26 and 27) and conveyed via the line (28) into the exhaust air chimney (not shown).
  • the dust accumulating in the electrostatic filters (9, 11) and the undersize particles accumulating in the screening device (7) are transported via the lines (24, 29 and 20) and finally via the return line (25) into the storage container (3) for returned goods.
  • the amount of coke branched off for conditioning in the electrostatic filters (9, 11) is separated again from the sintered exhaust gas or from the exhaust air, except for very small residual amounts, and is fed via the lines (24, 29) into the return line (25) and finally into the storage container (3) is returned for the returned goods, no additional material is required for the conditioning according to the invention with finely ground coke.
  • the "misused" fuel for conditioning remains almost completely in the system, so that the process is economically very advantageous.
  • the amount of coke branched off via the line (31) can be adjusted quantitatively and qualitatively to the respective requirements via the adjustable fineness of grinding in the coke mill (30). This ensures that the intended improvement in the separation performance can be achieved with minimal additional effort.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrostatic Separation (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Claims (4)

1. Procédé pour améliorer la capacité de séparation d'électrofiltres dans des installations d'agglomération - constituées essentiellement de réservoirs et de dispositifs de transport pour le minerai de fer, la chaux, le poussier de coke et le produit recyclé, d'une bande d'agglomération continue entraînée avec un grand nombre de boîtes à vent sous-jacentes, d'un ventilateur d'aspiration, avec un électrofiltre monté en amont, pour les gaz brûlés de la bande d'agglomération, d'un dispositif de criblage, ainsi que d'un ventilateur d'aspiration avec un électrofiltre monté en amont pour le dépoussiérage du local- par addition d'un agent de conditionnement solide à grains fins au courant de gaz brûlé, caractérisé en ce qu'il consiste à dériver, comme agent de conditionnement, de 0,5 à 5 % de la quantité de poussier à coke nécessaire comme combustible pour le processus d'agglomération, à les broyer indépendamment et à les introduire dans les gaz brûlés de la bande d'agglomération par l'une des boîtes à vent, à séparer cette quantité de coke en même temps que la poussière et à la retourner au processus d'agglomération.
2. Procédé suivant la revendication 1, caractérisé en ce qu'il consiste à dériver au moins 2 % de la quantité de poussier de coke nécessaire comme combustible et à la broyer séparément, et à introduire une partie de cette quantité de coke dans l'une des boîtes à vent de la bande d'agglomération et l'autre partie dans le conduit d'aspiration pour le dépoussiérage du local.
3. Procédé suivant la revendication 2, caractérisé en ce qu'il consiste à introduire environ 20 % de la quantité de coke déviée dans l'une des boîte à vent de la bande d'agglomération.
4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce qu'il consiste à broyer la quantité de poussier de coke qui a été déviée à une granulométrie moyenne d50 de 2 à 20 µm.
EP89200441A 1988-03-02 1989-02-22 Procédé d'augmentation du rendement de précipitation d'électrofiltres Expired - Lifetime EP0331243B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89200441T ATE77062T1 (de) 1988-03-02 1989-02-22 Verfahren zur verbesserung der abscheideleistung von elektrofiltern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3806591A DE3806591A1 (de) 1988-03-02 1988-03-02 Verfahren zur verbesserung der abscheideleistung von elektrofiltern
DE3806591 1988-03-02

Publications (2)

Publication Number Publication Date
EP0331243A1 EP0331243A1 (fr) 1989-09-06
EP0331243B1 true EP0331243B1 (fr) 1992-06-10

Family

ID=6348542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89200441A Expired - Lifetime EP0331243B1 (fr) 1988-03-02 1989-02-22 Procédé d'augmentation du rendement de précipitation d'électrofiltres

Country Status (9)

Country Link
US (1) US4925487A (fr)
EP (1) EP0331243B1 (fr)
JP (1) JPH01270957A (fr)
KR (1) KR890014715A (fr)
AT (1) ATE77062T1 (fr)
AU (1) AU605084B2 (fr)
DE (2) DE3806591A1 (fr)
ES (1) ES2031681T3 (fr)
ZA (1) ZA891616B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939214A1 (de) * 1989-11-28 1991-06-13 Ftu Gmbh Verfahren zur reinigung von abgasen
ES2685446T3 (es) * 2015-09-16 2018-10-09 General Electric Technology Gmbh Acondicionamiento de polvo en gases de banda de sinterización para un precipitador electrostático

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361314C (de) * 1921-03-15 1922-10-12 Metallbank Verfahren und Vorrichtung zur Beseitigung von Stoerungen durch schlecht oder nicht leitende Niederschlaege bei elektrischen Gasreinigern
US3909189A (en) * 1971-08-25 1975-09-30 Mcdowell Wellman Eng Co Process for conditioning sinter draft for electrostatic precipitation of particulate material therefrom
DE2524444C2 (de) * 1975-06-03 1983-04-21 ARBED S.A., 2930 Luxembourg Verfahren zur Regelung des Fe hoch ++-Gehaltes im Sinter
JPS602597B2 (ja) * 1982-05-18 1985-01-22 住友重機械工業株式会社 排ガス循環式焼結装置

Also Published As

Publication number Publication date
ATE77062T1 (de) 1992-06-15
AU605084B2 (en) 1991-01-03
JPH01270957A (ja) 1989-10-30
US4925487A (en) 1990-05-15
ZA891616B (en) 1990-11-28
DE3806591A1 (de) 1989-09-14
AU3085789A (en) 1989-09-07
DE58901617D1 (de) 1992-07-16
ES2031681T3 (es) 1992-12-16
KR890014715A (ko) 1989-10-25
EP0331243A1 (fr) 1989-09-06

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