EP0022549A1 - Verfahren und Anlage zum Einblasen fester Brennstoffe in einen Schachtofen - Google Patents

Verfahren und Anlage zum Einblasen fester Brennstoffe in einen Schachtofen Download PDF

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Publication number
EP0022549A1
EP0022549A1 EP80103904A EP80103904A EP0022549A1 EP 0022549 A1 EP0022549 A1 EP 0022549A1 EP 80103904 A EP80103904 A EP 80103904A EP 80103904 A EP80103904 A EP 80103904A EP 0022549 A1 EP0022549 A1 EP 0022549A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
hot wind
air
blower
wind
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.)
Granted
Application number
EP80103904A
Other languages
English (en)
French (fr)
Other versions
EP0022549B1 (de
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/de
Application granted granted Critical
Publication of EP0022549B1 publication Critical patent/EP0022549B1/de
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.
  • the pneumatic route is used for injecting liquid fuels into ovens, relatively large quantities of propulsion fluids, which is generally air, must be considered.
  • the temperature of the propelling air cannot exceed 80 to 120 ° C. In other words, not only is there a risk of nullifying the effect of the mixing station by again disturbing the temperature of the hot wind by means of the propelling air, but also it will be necessary, or else increase the power of the cowpers to compensate this loss of temperature, or else be satisfied with a lower operating temperature of the hot wind.
  • 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.
  • the installation for implementing this method is essentially characterized by a circuit parallel to the supply circuit of the circular pipe in hot wind, connected between a point located in the cold air supply pipe of 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 heating 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 furnace 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 mixing station 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 con line 18 connected to the blower 10. The necessary quantity of cold air admitted into the mixing station 16 through the line 18 is adjusted automatically by means of an automatic valve 20 which regulates the flow of cold air as a function of the temperature of the 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 DP produced in the compressor 28 is generally 2 bars, counting approximately 1 bar for the compensation of the pressure drops 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 admission of solid fuel, in powder or powder form into the circuit 22 is carried out using a blast airlock with a cellular rotor 30 well known per se.
  • This solid fuel which can be lignite powder or coal powder, is then propelled through line 32 in the furnace nozzles.
  • the propulsion air undergoes heating in the compressor 28.
  • a cooling device 33 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 of drawing off the propelling air, that is to say between the valve 20 and the station 16, it is preferable to provide a downstream of the compressor 28 a cooling device 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 18 is approximately 120 ° C. it is possible to ensuring that the temperature of the propelling air in line 32, in particular at the time of injection into the oven, is also approximately 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 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)
  • Blast Furnaces (AREA)
  • Feeding And Controlling Fuel (AREA)
EP80103904A 1979-07-17 1980-07-09 Verfahren und Anlage zum Einblasen fester Brennstoffe in einen Schachtofen Expired EP0022549B1 (de)

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 true EP0022549A1 (de) 1981-01-21
EP0022549B1 EP0022549B1 (de) 1984-05-16

Family

ID=19729201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103904A Expired EP0022549B1 (de) 1979-07-17 1980-07-09 Verfahren und Anlage zum Einblasen fester Brennstoffe in einen Schachtofen

Country Status (13)

Country Link
US (1) US4325312A (de)
EP (1) EP0022549B1 (de)
JP (1) JPS5616607A (de)
AR (1) AR221650A1 (de)
AT (1) ATE7515T1 (de)
AU (1) AU536120B2 (de)
BR (1) BR8004523A (de)
CA (1) CA1150505A (de)
DE (1) DE3067831D1 (de)
ES (1) ES8103579A1 (de)
LU (1) LU81519A1 (de)
PL (1) PL225726A1 (de)
ZA (1) ZA804195B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077919A1 (de) * 1981-10-02 1983-05-04 Paul Wurth S.A. Verfahren zum pneumatischen Einbringen dosierter Mengen pulverförmiger Stoffe in einen unter veränderlichem Druck stehenden Behälter und die Anwendung dieses Verfahrens auf Schachtöfen
FR2567997A1 (fr) * 1984-07-23 1986-01-24 Japan Foundry Service Co Ltd Dispositif et procede de fusion comportant un apport de charbon pulverise, en particulier dans un four a cuve

Families Citing this family (2)

* 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
LU90150B1 (de) * 1997-10-15 1999-04-16 Kuettner Gmbh & Co Kg Dr Verfahren un Vorrichtung zum Einblasen von Reduktionsmittel in einen Schachtofen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE623054A (de) * 1963-09-03
US1505723A (en) * 1923-01-26 1924-08-19 United Eng Foundry Co Rotary feed member
US1535174A (en) * 1920-09-29 1925-04-28 Mcgregor Alexander Grant Art of feeding powdered coal to blast furnaces
FR1364215A (fr) * 1962-06-15 1964-06-19 Kellogg M W Co Système d'injection de matières solides fluidifiables par exemple pour des hautsfourneaux
US3197304A (en) * 1961-10-12 1965-07-27 United States Steel Corp Method for introducing coal into a blast furnace
DE1256149B (de) * 1964-11-17 1967-12-07 Waeschle Maschf Gmbh Verfahren zum Foerdern von waermeempfindlichem, pulverfoermigem oder koernigem Gut durch Druckluft
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630649A (de) * 1962-04-05
US3301544A (en) * 1964-02-18 1967-01-31 Babcock & Wilcox Co Blast furnace pulverized coal firing system
US3371917A (en) * 1965-10-21 1968-03-05 Buell Engineering Company Inc Apparatus for feeding fuel into a blast furnace

Patent Citations (7)

* 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
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 (de) * 1963-09-03
DE1256149B (de) * 1964-11-17 1967-12-07 Waeschle Maschf Gmbh Verfahren zum Foerdern von waermeempfindlichem, pulverfoermigem oder koernigem Gut durch Druckluft
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IRON AND STEEL ENGINEER, vol. 53, no.8, août 1976, Pittsburgh PA US, C.J. LABEE: "Armco uses pulverized coal injection at Ashland", pages 51-52. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077919A1 (de) * 1981-10-02 1983-05-04 Paul Wurth S.A. Verfahren zum pneumatischen Einbringen dosierter Mengen pulverförmiger Stoffe in einen unter veränderlichem Druck stehenden Behälter und die Anwendung dieses Verfahrens auf Schachtöfen
FR2567997A1 (fr) * 1984-07-23 1986-01-24 Japan Foundry Service Co Ltd Dispositif et procede de fusion comportant un apport de charbon pulverise, en particulier dans un four a cuve
GB2163537A (en) * 1984-07-23 1986-02-26 Japan Foundry Service Co Ltd Melting apparatus

Also Published As

Publication number Publication date
ES494171A0 (es) 1981-03-16
AU5962880A (en) 1981-01-22
DE3067831D1 (en) 1984-06-20
LU81519A1 (fr) 1979-10-31
EP0022549B1 (de) 1984-05-16
AR221650A1 (es) 1981-02-27
ES8103579A1 (es) 1981-03-16
PL225726A1 (de) 1981-05-08
ATE7515T1 (de) 1984-06-15
JPS5616607A (en) 1981-02-17
ZA804195B (en) 1981-07-29
CA1150505A (en) 1983-07-26
US4325312A (en) 1982-04-20
AU536120B2 (en) 1984-04-19
BR8004523A (pt) 1981-02-03

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