EP0978574A1 - Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug - Google Patents

Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug Download PDF

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Publication number
EP0978574A1
EP0978574A1 EP98830477A EP98830477A EP0978574A1 EP 0978574 A1 EP0978574 A1 EP 0978574A1 EP 98830477 A EP98830477 A EP 98830477A EP 98830477 A EP98830477 A EP 98830477A EP 0978574 A1 EP0978574 A1 EP 0978574A1
Authority
EP
European Patent Office
Prior art keywords
quaternary ammonium
composition according
ammonium salt
salt
alkyl
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Withdrawn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
EP98830477A
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English (en)
French (fr)
Inventor
Salvatore c/o Nalco Italiana S.p.A. Paolillo
Giuseppe c/o Nalco Italiana S.p.A. Parri
Francesco Nalco Italiana S.p.A. Ricciardi
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.)
ChampionX LLC
Original Assignee
Nalco Chemical Co
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 Nalco Chemical Co filed Critical Nalco Chemical Co
Priority to EP98830477A priority Critical patent/EP0978574A1/de
Priority to KR1019990031016A priority patent/KR20000016979A/ko
Priority to AU42363/99A priority patent/AU4236399A/en
Priority to JP11218966A priority patent/JP2000073044A/ja
Priority to CA002279553A priority patent/CA2279553A1/en
Publication of EP0978574A1 publication Critical patent/EP0978574A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation

Definitions

  • the present invention relates to cationic surfactants in the form of quaternary ammonium salts or mixtures thereof, compositions comprising one or more of said quaternary ammonium salts, and the use thereof as antifouling agents for induced draft fans for extracting burnt gases from steel plant units.
  • LD LD
  • BOF Basic Oxygen Furnace
  • Such a converter consists of the following units: converter, oxygen lances and the cooling system thereof, heat recovery hood and cooling system, as well as a gas scrubbing system (scrubber) and cooling system.
  • oxygen is injected through a lance into the steel raw material at a rate of about 424,700 l/min.
  • the steel raw material consists of hot metal from the blast furnace, scrap steel and fluorspar.
  • the BOF process rapidly refines scraps and blast furnace iron into molten steel having the desired chemical composition and temperature. The injection period runs for 20 to 25 minutes for melting and burning off impurities.
  • the gases leaving the furnace hood during the oxygen injection process are very hot.
  • Part of the heat may be recovered from said gases by means of a waste heat recovery boiler directly mounted over the hood.
  • the dust load in this system is higher than in other systems, and particularly in the range of 27 to 33 kg/ton of steel.
  • the extremely small size of the particulate and the generally high zinc content (2-5%) make this dust undesirable for sintering.
  • the system is provided with gas scrubbers and gas coolers which remove particulate and heat from the gases.
  • the large amount of fine particles produced is about 1-2% of the finished tonnage.
  • the particulate is extremely fine, generally with size of 1-2 microns.
  • the volume of dust is also a function of the oxygen consumption rate, where the greatest dust volumes occur during injection with flux addition.
  • the chemistry of the gas streams changes considerably during injection as a function of the loads and the resultant gases produced in the course of the process.
  • the gas cleaning during the BOF process is accomplished by means of electrostatic precipitators (BOF dry flow system) and/or high energy Venturi scrubbers (OG wet process system).
  • BOF dry flow system electrostatic precipitators
  • OG wet process system high energy Venturi scrubbers
  • the wet scrubber plant comprises a quencher (vessel or fixed throat venturi), and a variable throat venturi, where dirty gases are cleaned to an outlet dust loading of less than 3 g/m 3 of dry gas.
  • the gases leaving the hood section at a temperature of about 1010°C pass through the quencher where they are cooled to less than 148°C.
  • the thus cooled gases then enter a separate elbow pipe, where most of the water carrying solids is separated from the gas stream.
  • This stream enters then a variable throat venturi system, the orifice of which dimensionally adjusts in order to maintain an optimum gas cleaning under the varying conditions of temperature, pressure and flow of the gas.
  • dirty water is separated from the gas stream which, optionally, enters a gas cooler and then arrives at the outlet fans.
  • the forced draft fans which are driven by an electric motor, move the gas towards the scrubber and to the upper part of the blast furnace or to the vent.
  • the induced draft fans are not provided with an electric motor, and it is the geometry and the physics of the system which create the gas suction from the system to the stack, based on the difference in temperature, and thus density and pressure, of burnt gases, thus driving the fans.
  • the induced draft fans move the gas from the scrubber to the discharge vent or to the upper part of the blast furnace.
  • the gas reaching the IDF still includes some small-sized particulate which is problematic and undesirable in that it creates deposits causing problems in the unit.
  • the extracting units are of the forced draft type between the converter and the scrubber, whereas they are of the induction type downstream of the scrubber and upstream of the stack.
  • the aim of the present invention is to solve the problems arising from impurities remaining in the gases by means of a chemical treatment. Unexpectedly, it was found that injecting cationic surfactants into the collector placed upstream of the fan solves or at least greatly reduces the above problems.
  • quaternary ammonium salts have the following general chemical structure: wherein:
  • the use of one or more quaternary ammonium salts having at least one of the following radicals bonded to the nitrogen atom: alkyl, alkyaryl, or etherocycle (imidazoliniunm, pyridinium, etc.) and containing an alkyl chain with 8 to up to 18 carbon atoms is provided.
  • the antifouling product (a quaternary ammonium salt or a mixture of such salts) is preferably in the liquid form, particularly a solution.
  • a liquid product of suitable viscosity is available which can be easily supplied to the system by means of a positive displacement pump, such as for example a piston supply pump, etcetera.
  • the optimum injection point of the product in the system is preferably the burnt gas duct, immediately upstream of the extractor impeller (fan).
  • the liquid product is injected into the gas stream by means of a suitable pump and spraying nozzle adapted to change the liquid to an aerosol, in such a way that the droplets reach the fans.
  • the quaternary ammonium salt or salts are present in the composition in an amount of 15 to 60% by weight based on the total composition, more preferably 25 to 45% by weight.
  • the balance of the composition is water and solvents.
  • Said solvents can be, among others, ethylene glycol, isobutylic alcohol, or isopropylic alcohol, or any other solvent not hindering the dispersion of the active agent in the liquid medium.
  • the product is a mixture of two quaternary ammonium salts, with a content of active material of 35.6%, in 8% ethylene glycol, and 56.4% water.
  • the recommended dosage is 1 to 100 g of the product for 1000 Nm 3 of gas, corresponding to 1 to 36 g of active material for 1000 Nm 3 of gas.
  • the optimum and preferred dosage is 15 to 30 g for 1000 Nm 3 of gas, corresponding to 5 to 11 g of active material for 1000 Nm 3 of gas.
  • any solvent, and preferably mixtures of solvents, suitable for obtaining a stable solution, can be used in the product of the invention.
  • the dosage is to be intended as proportional to the dose range as indicated, i.e. a function of the active material content of the solution.
  • the burnt gas extractors of a steel plant (oxygen converters) or blast furnace can in fact have a critical operability as a function of the amount of particulate polluting the gas.
  • Steel plant gases, i.e. gases leaving the oxygen converters, are particularly rich in solid particles. This is the result of the high turbulence caused by the oxygen lance.
  • the particulate depends on the nature of the raw materials, among which the quality of metal scraps has an important role.
  • the metal scraps come from inner or outer recycles, and can thus contain different impurities, such as zinc oxides if scraps of electroplated steel are present in a relatively high quantity.
  • the gases have a calorific power, such as in blast furnace gases or gases from "suppressed combustion” oxygen conversion, they have to be purified in order to meet the requirements making them suitable to be used as fuels.
  • the IDF sends the gases to the gasometer.
  • the IDF passes the gases to the stack.
  • the extractor can either send the gases to the stack or to the gasometer, by adjusting appropriate valves.
  • the purpose of the wet scrubber in a total combustion oxygen steel plant is to purify the gases to such a level as to permit restitution to the atmosphere, in accordance with the laws relevant to air pollution.
  • gases are also water-cooled, in order to decrease their volume and accordingly the bulk of the extractor and its relevant power consumption.
  • the status of the IDF was defined by the following parameters:
EP98830477A 1998-08-04 1998-08-04 Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug Withdrawn EP0978574A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP98830477A EP0978574A1 (de) 1998-08-04 1998-08-04 Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug
KR1019990031016A KR20000016979A (ko) 1998-08-04 1999-07-29 유인환풍기용 오염방지제인 양이온 계면활성제
AU42363/99A AU4236399A (en) 1998-08-04 1999-07-29 Cationic surfactants as antifouling agents for induced draft fans (IDF)
JP11218966A JP2000073044A (ja) 1998-08-04 1999-08-02 誘引通風機（ｉｄｆ）用の防汚剤としての陽イオン表面活性剤
CA002279553A CA2279553A1 (en) 1998-08-04 1999-08-03 Cationic surfactants as antifouling agents for induced draft fans (idf)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830477A EP0978574A1 (de) 1998-08-04 1998-08-04 Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug

Publications (1)

Publication Number Publication Date
EP0978574A1 true EP0978574A1 (de) 2000-02-09

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EP98830477A Withdrawn EP0978574A1 (de) 1998-08-04 1998-08-04 Zusammensetzungen von kationische Tenside und deren Verwendung als verschmutzungsverhindernde Substanzen für Gebläse mit erzwungenen Abzug

Country Status (5)

Country Link
EP (1) EP0978574A1 (de)
JP (1) JP2000073044A (de)
KR (1) KR20000016979A (de)
AU (1) AU4236399A (de)
CA (1) CA2279553A1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887340A (en) * 1974-08-29 1975-06-03 Betz Laboratories Method for scrubbing gases derived from basic oxygen furnaces
US4000077A (en) * 1972-05-04 1976-12-28 Colgate-Palmolive Company Enhancement of cationic softener
FR2354376A1 (fr) * 1976-06-07 1978-01-06 Ici Ltd Agents fluidifiants
GB2131693A (en) * 1982-12-09 1984-06-27 Oreal Composition for local corticotherapy containing hydrocortisone
EP0277060A1 (de) * 1987-01-16 1988-08-03 Compagnie De Raffinage Et De Distribution Total France Dismulgierendes und Reinigungsmittel, verwendbar zur Trennung von Erdöl-Wasser-Gemischen, gegebenenfalls Emulsionen und Anwendungen dieses Mittels
EP0328335A1 (de) * 1988-02-08 1989-08-16 Waitomo Industrial Investments Ltd. Fäulnisverhindernde Zusammensetzung
EP0418986A2 (de) * 1989-09-22 1991-03-27 Colgate-Palmolive Company Verfahren zum Absorbieren lipophilen Schmutzes von einer Ober- fläche in eine Flüssigkristall-Detergenszusammensetzung
US5437712A (en) * 1994-03-01 1995-08-01 Betz Laboratories, Inc. Methods for inhibiting deposition and fouling in scrubber systems
JPH07268246A (ja) * 1994-03-31 1995-10-17 Sanyo Chem Ind Ltd 水性ストリッパブルペイント
DE19648888A1 (de) * 1996-11-26 1998-05-28 Remmers Bauchemie Gmbh Wasserverdünnbares Konzentrat für den Holzschutz

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000077A (en) * 1972-05-04 1976-12-28 Colgate-Palmolive Company Enhancement of cationic softener
US3887340A (en) * 1974-08-29 1975-06-03 Betz Laboratories Method for scrubbing gases derived from basic oxygen furnaces
FR2354376A1 (fr) * 1976-06-07 1978-01-06 Ici Ltd Agents fluidifiants
GB2131693A (en) * 1982-12-09 1984-06-27 Oreal Composition for local corticotherapy containing hydrocortisone
EP0277060A1 (de) * 1987-01-16 1988-08-03 Compagnie De Raffinage Et De Distribution Total France Dismulgierendes und Reinigungsmittel, verwendbar zur Trennung von Erdöl-Wasser-Gemischen, gegebenenfalls Emulsionen und Anwendungen dieses Mittels
EP0328335A1 (de) * 1988-02-08 1989-08-16 Waitomo Industrial Investments Ltd. Fäulnisverhindernde Zusammensetzung
EP0418986A2 (de) * 1989-09-22 1991-03-27 Colgate-Palmolive Company Verfahren zum Absorbieren lipophilen Schmutzes von einer Ober- fläche in eine Flüssigkristall-Detergenszusammensetzung
US5437712A (en) * 1994-03-01 1995-08-01 Betz Laboratories, Inc. Methods for inhibiting deposition and fouling in scrubber systems
JPH07268246A (ja) * 1994-03-31 1995-10-17 Sanyo Chem Ind Ltd 水性ストリッパブルペイント
DE19648888A1 (de) * 1996-11-26 1998-05-28 Remmers Bauchemie Gmbh Wasserverdünnbares Konzentrat für den Holzschutz

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9550, Derwent World Patents Index; Class A82, AN 95-390467, XP002088337 *

Also Published As

Publication number Publication date
KR20000016979A (ko) 2000-03-25
CA2279553A1 (en) 2000-02-04
AU4236399A (en) 2000-02-24
JP2000073044A (ja) 2000-03-07

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