EP0022549B1 - Procédé et installation d'injection de combustibles solides dans un four à cuve - Google Patents

Procédé et installation d'injection de combustibles solides dans un four à cuve Download PDF

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Publication number
EP0022549B1
EP0022549B1 EP80103904A EP80103904A EP0022549B1 EP 0022549 B1 EP0022549 B1 EP 0022549B1 EP 80103904 A EP80103904 A EP 80103904A EP 80103904 A EP80103904 A EP 80103904A EP 0022549 B1 EP0022549 B1 EP 0022549B1
Authority
EP
European Patent Office
Prior art keywords
injection
hot air
installation
nozzles
furnace
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
Application number
EP80103904A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0022549A1 (fr
Inventor
Léon Ulveling
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to AT80103904T priority Critical patent/ATE7515T1/de
Publication of EP0022549A1 publication Critical patent/EP0022549A1/fr
Application granted granted Critical
Publication of EP0022549B1 publication Critical patent/EP0022549B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal

Definitions

  • the present invention relates to a process for injecting solid fuels into a shaft furnace, in particular into a blast furnace, as well as an installation for carrying out this process.
  • a blast furnace is generally provided with a circular duct connected to the base of the furnace by a lining of wind carrier and hot wind injection nozzles which is produced in an installation comprising a blower, a battery of cowpers and a station of mixture having two inlets connected respectively to the blower and to each of the cowpers and an outlet supplying the circular pipe with hot wind at a constant and regulated temperature.
  • the hot wind is generally enriched by means of a fuel which is injected into this hot wind at the level of the nozzles.
  • liquid fuels and more particularly petroleum products, have been used, so to speak. Indeed, these liquid fuels have the advantage of being very easy to handle and the means used for their injection into the nozzles are simple, inexpensive and practically do not disturb the operation of other organs or installations, in particular the temperature of the hot wind into which they are injected.
  • US-A-1,535,174 describes a process for injecting solid fuel into the nozzles of a blast furnace, according to which the fuel is transported using pressurized air.
  • the air used is drawn from the wind supply line to the nozzles and in order to transport the fuel, it is compressed using a fan.
  • US-A-3,197,304 also describes a process for injecting solid fuel into the nozzles of a blast furnace, in which a proportioned portion of the air supplying the nozzles is drawn off and sent to a compressor and then in a heat exchanger. The air then reaches a dryer where it fluidizes the fuel particles and entrains them into the nozzles.
  • the latter can be supplied with fuel separately or a supply can be common to several nozzles.
  • the temperature of the propelling air cannot exceed 80 to 120 ° C.
  • the temperature of the propelling air cannot exceed 80 to 120 ° C.
  • the objective of the present invention is to provide a new method for injecting solid fuels into a shaft furnace which makes it possible to avoid the abovementioned drawbacks, that is to say not to influence the parameters d injection of hot wind.
  • a complementary objective of the invention is the production of an installation for the implementation of this process.
  • a process for injecting solid fuels into a tank furnace provided with a circular pipe connected to the base of the furnace by a lining of wind-carrier and hot-air injection nozzles this hot wind being produced in an installation comprising a blower, a battery of cowpers and a mixing station having two inlets connected respectively to each of the cowpers as well as to the blower by means of an automatic metering device which allows passage in the mixing station the metered quantity of cold wind necessary for stabilizing the temperature of the hot wind which is sent to the circular pipe so that the hot wind circulating in it is at a regulated and constant temperature, and according to which metered quantities of solid fuels in powder form are injected into the hot wind before it enters the furnace, the transport and injection of this solid fuel being real pneumatically driven, characterized in that the pneumatic propulsion fluid used for transporting and injecting the fuel in the hot wind consists of at least one part of the said metered amount of cold wind which is drawn between the metering device and the mixing station and which
  • the installation for implementing this process is essentially characterized in that the pneumatic fuel injection circuit is arranged parallel to the circuit for supplying the circular pipe with hot wind and connected between a point located in the pipe d cold air supply to the mixing station, on the one hand and each of the nozzles on the other hand and comprising a compressor and at least one solid fuel intake device.
  • the fuel intake device preferably consists of a series of airlock airlocks, the number of which can be equal to half the number of nozzles so that an airlock is associated with a pair of nozzles.
  • FIG. 1 schematically shows a blast furnace 2 provided with a circular pipe 4 for supplying hot wind.
  • This circular pipe 4 is connected to the base of the furnace by means of a series of air carriers 6 connected to nozzles not shown embedded in the wall of the furnace.
  • the hot wind for supplying the circular pipe 4 and the wind carriers 6 is produced in an installation 8 essentially comprising a battery of cowpers 12, 14 well known per se.
  • cowpers are, in fact, ovens intended to heat the cold air coming from a blower 10 to a temperature higher than that of the hot wind injected into the oven.
  • the operation of such a cowper comprises two phases, namely a phase of warming and storage of heat and a phase of removal of the stored heat and warming of the cold air. Therefore, to ensure continuous operation, at least one pair of alternating cowpers is required.
  • the designation "cold" of the air sent by the blower 10 into the cowpers 12 and 14 is not significant, since the temperature of this "cold” air is approximately 100 to 120 ° C due to the heating in the blower 10.
  • the temperature of the hot air leaving the cowpers depends on the thermal requirements for injection into the oven. When the hot air injected into the oven must have a temperature of approximately 1200 ° C, the heating produced in the cowpers 12, 14 must rise to approximately 1300 ° C to compensate for the heat losses and to be able to ensure a constant temperature in a station. mixing 16.
  • this mixing station 16 The purpose of this mixing station 16 is to ensure a constant temperature of the hot wind for injection into the oven. Indeed, it is not possible to have a constant and uniform temperature at the exit of the cowpers where there are always fluctuations of a few tens of degrees. This is the reason why it is necessary to heat the hot wind in the cowpers to a sufficient temperature in order to be able to reduce it to a uniform temperature in the mixing station 16 by admitting a metered amount of cold wind through a pipe. 17 connected to the blower 10. The necessary quantity of cold air admitted into the mixing station 16 through the line 17 is automatically adjusted by means of an automatic valve 20 which regulates the flow of cold air as a function of the temperature hot wind in the circular pipe. In this way, it is ensured that the temperature of the hot wind injected into the oven remains constant.
  • This installation 8 for producing hot wind as shown in the figure constitutes a conventional installation well known per se.
  • a parallel circuit 22 is grafted onto this installation 8 for the pneumatic injection of solid fuels into each of the furnace nozzles.
  • a pipe 24 connected to the cold air intake pipe of the mixing station 16 between the latter and the valve 20 and intended to extract the quantity of air necessary for the pneumatic propulsion of the solid fuel. The adjustment of the amount of propelled air deflected in line 24 is automatically adjusted by a valve 26 as required.
  • a compressor 28 intended to raise the pressure of the propelling air in circuit 22 so as to compensate for the pressure losses and ensure injection into the furnace.
  • the pressure difference ⁇ P produced in the compressor 28 is generally 2 bars, counting approximately 1 bar for the compensation of the pressure losses and a reserve of one bar for the injection. Consequently, if the pressure of the hot wind to be injected into the furnace is approximately 2.5 bars, the pressure of the propelling air downstream from the compressors 28 is approximately 4.5 bars.
  • the propulsion air undergoes heating in the compressor 28.
  • the temperature of the propelling air In order to prevent the temperature of the propelling air from reaching the self-ignition threshold of the solid fuel and, also, to reduce the temperature at a value approximately equal to the temperature at the place where the propelling air is drawn off, that is to say between the valve 20 and the station 16, it is preferable to provide a device downstream of the compressor 28 cooling 33.
  • the activity of this cooler 33 can be controlled automatically as a function of the heating in the compressor 28. In this way, if the temperature of the cold air circulating in the pipe 17 is approximately 120 ° C. so that the temperature of the propelling air in line 32, in particular at the time of injection into the oven is also around 120 °.
  • the integration of the circuit 22 into the circuit 8 for producing hot wind does not in any way disturb the operation of the latter and in particular the temperature of the hot wind injected into the oven.
  • the quantity of cold air required by the mixing station 16 for maintaining a constant temperature of the hot wind is determined by the valve 20 and this quantity will always pass through it. The difference is that part of the air delivered by the valve 20 is no longer sent to the mixing station 16, but through the circuit 22 so that the total amount of cold air mixed with the hot wind produced by the cowpers don't change. Part of the mixing, instead of being carried out in the mixing station 16, is now carried out at the level of the injection of the fuel into the wind carriers or into the nozzles.
  • a valve 34 is provided allowing the admission of atmospheric air in circuit 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Blast Furnaces (AREA)
EP80103904A 1979-07-17 1980-07-09 Procédé et installation d'injection de combustibles solides dans un four à cuve Expired EP0022549B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103904T ATE7515T1 (de) 1979-07-17 1980-07-09 Verfahren und anlage zum einblasen fester brennstoffe in einen schachtofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU81519A LU81519A1 (fr) 1979-07-17 1979-07-17 Procede et installation d'injection de combustibles solides dans un four a cuve
LU81519 1979-07-17

Publications (2)

Publication Number Publication Date
EP0022549A1 EP0022549A1 (fr) 1981-01-21
EP0022549B1 true EP0022549B1 (fr) 1984-05-16

Family

ID=19729201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103904A Expired EP0022549B1 (fr) 1979-07-17 1980-07-09 Procédé et installation d'injection de combustibles solides dans un four à cuve

Country Status (13)

Country Link
US (1) US4325312A (pt)
EP (1) EP0022549B1 (pt)
JP (1) JPS5616607A (pt)
AR (1) AR221650A1 (pt)
AT (1) ATE7515T1 (pt)
AU (1) AU536120B2 (pt)
BR (1) BR8004523A (pt)
CA (1) CA1150505A (pt)
DE (1) DE3067831D1 (pt)
ES (1) ES494171A0 (pt)
LU (1) LU81519A1 (pt)
PL (1) PL225726A1 (pt)
ZA (1) ZA804195B (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441082A1 (de) * 1984-07-23 1986-01-23 Japan Foundry Service Co., Ltd., Komaki, Aichi Schmelzanordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852858U (ja) * 1981-09-28 1983-04-09 テンパール工業株式会社 漏電しや断器
LU83671A1 (fr) * 1981-10-02 1983-06-08 Wurth Paul Sa Procede d'injection de quantites dosees de matieres pulverulentes par voie pneumatique dans une enceinte se trouvant sous pression variable et application a un four a cuve
LU90150B1 (de) 1997-10-15 1999-04-16 Kuettner Gmbh & Co Kg Dr Verfahren un Vorrichtung zum Einblasen von Reduktionsmittel in einen Schachtofen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1535174A (en) * 1920-09-29 1925-04-28 Mcgregor Alexander Grant Art of feeding powdered coal to blast furnaces
US1505723A (en) * 1923-01-26 1924-08-19 United Eng Foundry Co Rotary feed member
US3197304A (en) * 1961-10-12 1965-07-27 United States Steel Corp Method for introducing coal into a blast furnace
BE630649A (pt) * 1962-04-05
FR1364215A (fr) * 1962-06-15 1964-06-19 Kellogg M W Co Système d'injection de matières solides fluidifiables par exemple pour des hautsfourneaux
BE623054A (pt) * 1963-09-03
US3301544A (en) * 1964-02-18 1967-01-31 Babcock & Wilcox Co Blast furnace pulverized coal firing system
DE1256149B (de) * 1964-11-17 1967-12-07 Waeschle Maschf Gmbh Verfahren zum Foerdern von waermeempfindlichem, pulverfoermigem oder koernigem Gut durch Druckluft
US3371917A (en) * 1965-10-21 1968-03-05 Buell Engineering Company Inc Apparatus for feeding fuel into a blast furnace
LU81388A1 (fr) * 1979-06-15 1979-09-12 Wurth Paul Sa Procede et installation de dosage et de transport par voie pneumatique de matieres solides vers une enceinte sous pression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441082A1 (de) * 1984-07-23 1986-01-23 Japan Foundry Service Co., Ltd., Komaki, Aichi Schmelzanordnung

Also Published As

Publication number Publication date
EP0022549A1 (fr) 1981-01-21
ES8103579A1 (es) 1981-03-16
US4325312A (en) 1982-04-20
BR8004523A (pt) 1981-02-03
DE3067831D1 (en) 1984-06-20
AU536120B2 (en) 1984-04-19
PL225726A1 (pt) 1981-05-08
AR221650A1 (es) 1981-02-27
ATE7515T1 (de) 1984-06-15
ZA804195B (en) 1981-07-29
CA1150505A (en) 1983-07-26
AU5962880A (en) 1981-01-22
LU81519A1 (fr) 1979-10-31
ES494171A0 (es) 1981-03-16
JPS5616607A (en) 1981-02-17

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