US3150962A - Pulverized coal firing method and system for blast furnace - Google Patents

Pulverized coal firing method and system for blast furnace Download PDF

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US3150962A
US3150962A US185438A US18543862A US3150962A US 3150962 A US3150962 A US 3150962A US 185438 A US185438 A US 185438A US 18543862 A US18543862 A US 18543862A US 3150962 A US3150962 A US 3150962A
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air
coal
pulverized coal
blast furnace
pulverizer
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US185438A
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Pearson Leonard
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Babcock and Wilcox Co
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Babcock and Wilcox Co
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Priority to BE630649D priority Critical patent/BE630649A/xx
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Priority to US185438A priority patent/US3150962A/en
Priority to GB1287963A priority patent/GB981996A/en
Priority to DEB71390A priority patent/DE1257055B/de
Priority to ES286752A priority patent/ES286752A1/es
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/002—Feeding devices for steam boilers, e.g. in locomotives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/006—Fuel distribution and transport systems for pulverulent fuel

Definitions

  • the steel industry has operated blast furnaces with a charge of lump or granular iron ore, limestone (or other fiuxing material) and coke.
  • the coke not only provides the carbon necessary in the smelting of the ore, but also provides the source of heat for the chemical reactions occurring in the smelting process.
  • the coke used will be of a high quality and of a size large enough not to be blown out of the furnace by the flow of gases upwardly therethrough.
  • the coke should be firm and strong enough to withstand the weight of the blast furnace burden or charge. Coke is expensive to produce and requires a heavy capital in vestment for the construction of coke ovens for the ton nage required.
  • the present invention provides for the introduction of pulverized coal into a blast furnace, with the pulverized coal replacing a portion of the usual coke charge on at least a pound for pound basis.
  • the unit cost of the coke is approximately double that of the pulverized coal on an equal tonnage basis, hence there is a saving in fuel costs and a major reduction in the cost of producing steel.
  • the furnace volume occupied by the pulverized coal as compared to that which would be cc cupied by coke of equivalent heat value, permits an in creased charge of iron ore and limestone to the furnace thus increasing the smelting capacity of the blast furnace.
  • the pulverizer In preparing the pulverized coal for injection into the furnace, the pulverizer is operated under high pressure conditions so that the pressure of the coal being injected will be greater than the pressure prevailing in the lower portion of the furnace.
  • the carrier air is preheated to provide for drying the coal by vaporizing the moisture in the coal.
  • the vaporized moisture may be vented from the coal preparation system or introduced into the blast furnace.
  • the coal and carrier air discharged from the pulverizer is delivered to coal and air separators posi tioned adjacent the furnace with a major portion, for example 80%, of the air being recirculated to the pul verizer. The remainder, i.e.
  • the pulverized coal system is substantially of the direct fired type, where the pulverizer is operated as long as fuel is required for the furnace, but with the proportionate amount of air mixed with the pulverized coal for delivery to the combustion space of the furnace being only a fraction of the air to coal ratios usually employed in pulverizer operations.
  • a pulverized coal system is sometimes known as a semi-direct arrangement, and is particularly advantageous in an application of pulverized coal to a blast furnace where a minimum amount of low temperature injection air is desirable.
  • the pulverized fuel system is arranged to serve a blast furnace where one pulverizer supplies the pulverized coal for one furnace.
  • one pulverizer supplies the pulverized coal for one furnace.
  • it will be both desirable and necessary to provide a plurality of pulverizers for each blast furnace, to insure the requisite flexibility of operations.
  • it will be de sirable to provide one or more additional pulverizers tied into a common fuel supply system, this equipment being used for stand-by purposes, as when a pulverizer is withdrawn from service for maintenance purposes.
  • FIG. 1 is a schematic elevation, partly in section, of a pulverized coal supply system as applied to a blast furnace according to the invention
  • FIG. 2 is an enlarged plan of the blast furnace with the pulverized coal injection system, as viewed from line 2-2 of FIG. 1;
  • FIG. 3 is a further enlarged schematic elevation of the pulverized coal injection system of the invention.
  • a single pulverizer 10 provides pulverized coal through a semi-direct supply system for use in a blast furnace ll.
  • the coal from the pulverizers will be separated from the carrier medium in a separating zone 12 adjacent the blast furnace, with a major portion of the carrier air being recycled to the pulverizer It) for reuse.
  • the recycled carrier air with the required make up air, is used as a carrier medium for transportation of the pulverized coal to the separating zone.
  • the remaining, minor portion of the separated carrier air may be used to inject the pulverized coal into the blast furnace.
  • the blast furnace 11 illustrated is of the usual or conventional construction wherein provisions are made for the delivery of iron ore, coke and flux (such as limestone) to the upper end of the blast furnace.
  • iron ore, coke and flux such as limestone
  • the charge of solid materials so introduced fills the blast furnace 11 and as the iron is smelted and tapped from the tap hole 13, fresh supplies of iron ore, coke and flux are delivered through suitable pressure sealing valves into the top of the furnace. Since the equipment for charging a blast furnace is well known in the art, this structure is not illustrated in the drawings.
  • the lower portion of the furnace is provided with a plurality of tuyeres 14 for the introduction of the high temperature, high pressure blast air.
  • the lower portion of the blast furnace is also provided with a port immediately below the level of the tuyeres 14 for the removal of slag.
  • high pressure air is compressed in a suitable compressor, such as an axial flow compressor 16.
  • a major portion ofthe high pressure air which may be at a pressure of as much as 40- p.s.i. is passed through a duct 17 to known regenerative heaters or stoves 18 which are heated by the combustion of suitable fuel.
  • regenerative heaters or stoves 18 which are heated by the combustion of suitable fuel.
  • all ofthe air or some portion of it is passed periodically through the stoves to absorb heat stored in the regenerative material by passage of hot combustion gas therethrough.
  • the hot air which may reach a temperature of 26003 F. is blended with high pressure air directly from the compressor 16 and then passed through a duct 20 to a header 21 encircling the lower portion of the blast furnace 11.
  • Blending provides a controlled and more uni form temperature of blast air to the blast furnace during the period in which each of the regenerative air heaters gives up its stored heat tothe air.
  • the header is connected with each of the tuyeres 14 of the furnace by individual goosenecks or pipes 22' for the injection of the blastair into the charge, or burden, within the furnace.
  • some of the fuel required for thereduction of the iron ore is provided in the form of pulverized coal.
  • the pulverized coal is substituted for some of the relatively expensive coke in the blast furnace charge, generally on a pound for pound basis.
  • the pulverizer 19 is located at a convenient position adjacent the blast furnace 1'1 and is supplied with raw coal and carrier air for preparation of the pulverized coal andits subsequent use in the blast furnace. Since, as hereinafter described, the pulverized coal is delivered to the furnace under high pressure conditions the pulverizer and its accessories are operated under a superatmospheric pressure of the order of 40 to 60 p.s.i.
  • the raw coal delivery for the pulverizer will include pressurized raw coal containers, which are provided with suitable valves and sealing means for pressurization of the raw coal therein.
  • the uppermost hopper 213 is open to theatmosphere, with raw coal delivered thereto by any convenient means, such as by a belt conveyor or an overhead crane (not shown).
  • the raw coal supply system is automated.
  • the bottom outlet from the hopper 23 is provided with a discharge spout having a coal gate 23A and a tightly closing bell type valve 24- which is positioned immediately above an intermediate closed tank 25 which is also provided with a suitable valve 26 at the bottom thereof capable of withstanding the high pressure of the pulverizing system.
  • the intermediate tank 25' opens to 21 lower bin 27 which in turn is provided with a valve28 and a discharge duct 39 leading directly to a feeder 31 positioned on the side of the pulverizer 10.
  • the coal delivery system illustrated is of the general type shown in US. Patent 2,511,017, may be automatically regulated and is arranged for the continuous con trolled delivery of raw coal to the pulverizer under high pressure operating conditions.
  • the pulverizer illustrated may be of the type shown in US. Patent 2,275,595 which is of the air-swept type supplied with carriermedium, such as air, delivered thereto from a blower 32.
  • the blower receives recirculatedr carrier air, at a. temperature of for example 220 with. make-up air which may be heated to the order of 1440- F. in a tubular air heater 33.
  • the makeup carrier is delivered to the heater 33 through a pipe 35 connectedwith the discharge side of a boostercompressor '36.
  • the compressor 36 may be of the axial iiow type with its inlet connected to the duct 17 to receive high exchanger 2915, provided to remove the heat of compression from the, air leaving compressor 16 before delivery to booster compressor 36m reduce the volume of air to be further compressed.
  • the recirculated low' tempera- -5tl have been stopped.
  • ture air is mixed in a mixing T 34 with the high tempera ture make-up air discharged through pipe 38 for delivery to the blower 32 and thence to the pulverizer 10.
  • the temperature of the carrier air leaving the pulverizer It) is controlled to a desired temperature such as 258 F. as by regulating the quantity and temperature of air passed to the mixer 34 from the heater 33.
  • An illustrative temperature of the order of 450 F. entering the pulverizer 10 is suitable for drying a raw coal containing '6 percent moisture during its pulverization.
  • the temperature of the air may be increased or decreased in relationship to an increase or decrease, respectively, of moisture in the raw coal delivered to the pulverizer.
  • the air passing through the air heater 33 is indirectly heated by hotgases produced by combustion of fuel.
  • the fuel may be blast furnace or coke oven gas, or the like, with the products of combustion from the furnace being discharged to atmosphere or to a heat trap.
  • FIG. 1 discloses only one coal and air separating zone 12, while in FIG. 2 four separating zones are shown.
  • the separate elements of each zone in FIG. 2 are designated by the same numerals with corresponding elements in the zone further identified by letters A, B, C and D common to each distinct separating zone.
  • the cyclone separators are uniformly spaced circumferentially of the blast furnace 11 and each is intended to separate the pulverized coal from its carrier medium.
  • the separated pulverized coal discharges downwardly from each cyclone separator into the associated discharge hoppers 42A, 42B, 42C and 42D, respectively, positioned immediately below each of the corresponding cyclone separators.
  • the separated carrier air discharges upwardly from each of the cyclone separators to associated cyclonic discharge heads 43A, 43B, 43C and 43D, respectively, where each is provided with a tangential carrier air outlet therefrom.
  • Each outlet opens to a pipe 44A, 44B, 44C and 44D, respectively, where the pipes combine adjacent the furnace in a conduit 45 which discharges to the mixer 34- and thence to the inlet of the blower 32.
  • a minor portion ofthe separated carrier medium passing through each of the pipes 44A, 44B, 44C and 44D is Withdrawn through associated connecting valved pipes 46A, 45B, 46C and 426D, respectively, each of which leads to a mixing T 4 7 (see H68. 1 and 3) positioned beneath the discharge end of each of the pulverized coal hoppers 42.
  • a motor driven pocket feeder orrotary valve 51 serves both as a feeding and sealing mechanism between each of the pulverized coal storage hoppers 42 and theassociated mixing T 47.
  • the valve 56 serves only as a seal between each of the hoppers 42 and the fuel injection systems hereinafter described.
  • Each ofthe rotary valves is driven by a variable speed motor for controlled start up for reasons which will hereinafterbeoome apparent, and in normal operation will have a pulverized coal feeding capacity of at least twice the maximum delivery rate of pulverized coal to each of the hoppers 42.
  • pulverized coal will not accumulate in the hopper 42 since pulverized coal is used in the blast furnacesubstantially as rapidly as it isprepared.
  • Each of the pipes 53 leading from the distributor is provided with a nozzle 55 which extends through the tuyere opening directly into the furnace, and is provided with a plug type cut-off valve 54.
  • the pulverized coal discharged through the nozzles 55 into the blast furnace may be positioned above or below or to either side of, or directly into, the blast air stream introduced through tuyeres. It is however convenient to discharge the pulverized coal stream through the tuyere opening so as to quickly mix the coal with the blast air within the furnace.
  • the pulverizer will have a load or coal output capacity range of approximately 4 to 1. Under these conditions it may be necessary to shut off one or more tuyeres 14 and the pulverized coal delivery in connection therewith. When this happens it is necessary to protect the fuel injector nozzle and the tuyeres against overheating, and at the same time prevent backup of slag or other materials into the coal pipe 53. Purge air may be used for this purpose.
  • high pressure purge air may be passed through the pipe 37 to purge air manifold 56 encircling the blast furnace 11 immediately above the header 21.
  • Each of the distributors 52 may be provided with purge air through a connecting valved pipe 57 leading from the purge air manifold 56 to the pipe 46 on the upstream side of the mixing T 47. (See FIGS. 2 and 3.)
  • the purge air connection will be used when one of the separators 41 and the associated set of tuyeres and burners is taken out of service. If one or less than all of the individual supply pipes 53 leading from a distributor 52 to the tuyeres is removed from service, each of such pipes is provided with purge air delivered through a valved connecting pipe 58.
  • the pipe 58 connects with the pulverized coal pipe immediately below the plug valve 54, one of which is located in each of the pulverized coal pipes 53.
  • each of the coal delivery lines may be supplied with purge air for cleaning and cooling purposes.
  • all or any ofthe pipes 53 serving the tuyeres 14 and each of the distributors serving such pipes may be provided with purge air to avoid pluggage or overheating.
  • the air stream passed through the pipes 46 would be directed to the atmosphere, preferably through wet or dry dust separators to clean the air prior to its atmospheric release.
  • the injection air passed to the mixing Ts 47 would then be obtained from the blower 36, as for example from the pipe 37.
  • the air quantities used for pulverized coal injection into the blast furnace would then be regulated for most advantageous operating conditions in the blast furnace, and would not be regulated to satisfy the coal moisture conditions within the pulverizing system, as would be necessary in the arrangement of FIG. 1.
  • the pulverizer is supplied with a controlled weight of raw coal and preheated air to remove the surface moisture from the coal during pulverization.
  • Control systems are known wherein a selected substantially uniform rate of raw coal 6 is delivered to the pulverizer, and the rate of air flow to the pulverizer is coordinated with coal flow for a desired coal to air ratio resulting in desirable pulverizing efficiency. See, for example, my copending application S.N. 801,539, now US. Patent No. 3,050.018, issued August 21, 1962.
  • the mixture of coal and air from the pulverizer is delivered in substantially equal quantities to the cyclone separators 41 where the coal and air is separated with the coal passing through the hopper 42 and the sealing valve 50 into the mixing T 47.
  • a major portion of the air discharging from the cyclone separators is returned to the pulverizer for use, with makeup air, as a carrier medium in the pulverizing system.
  • a minor portion of the separated air is vented from the pulverizing system and either used for injecting the pulverized coal into the blast furnace or discharged to the atmosphere, as hereinbefore described.
  • each of the separators 41 receives a substantially equal share of the total pulverized coal prepared in the pulverizing system, and each of the tuyere pipes 53 normally receives an equal share of the coal and air mixture delivered through pipe 51 to the distributors 52.
  • the distributor 52 tends to inject a larger portion of the fuel through the tuyere wtih the lower back pressure.
  • the pulverized coal injection system has a tendency to maintain the fuel to blast air ratio in balance for good combustion conditions within the furnace.
  • the pulverizing system including the pulverizer will contain coal which will be delivered to the separators 41 and accumulate in substantially equal quantities in the hoppers 42. In a relatively short period of time, of the order of five minutes, substantially all of the pulverized coal will be in the hoppers and the flow of carrier air through the system will be discontinued.
  • the stored pulverized coal should be removed from the hoppers 42 at a relatively slow rate so that the blast furnace is not flooded with fuel. This is accomplished by a selected pattern of starting the rotation of the seal valves 50, where the driving motors are arranged for slow starting speed.
  • the motor speed is increased so that the sealing valves 50 again operate as a seal mechanism and not as a feeder.
  • the process of firing a blast furnace with pulverized coal which comprises the steps of preparing a mixture of pulverized coal and carrier air in a pulverizing zone at a pressure sufliciently high to overcome the combined static pressure within said furnace and the pressure drop through the entire conveying system between said pulverizing zone and said furnace, maintaining said prepared mixture in a predetermined air to coal ratio, separating the carrier air from the pulverized coal of said mixture, and injecting the pulverized coal into said blast furnace in a plurality of streams of high pressure air at an air to coal ratio less than the ratio in said pulverizing zone.
  • a coal preparation and conveying system including a pulverizing zone and a separating zone comprising the steps of introducing coal into said pulverizing zone, entraining pulverized coal in a stream of carrier air in said pulverizing zone, separating said pulverized coal from said carrier air in said separating zone, circulating said carrier air in a continuous cycle through said pulverizing zone and said separating zone at a pressure sufficiently high to overcome the cumulative static pressure within said blast furnace and the pressure drop through said conveying system, Withdrawing a minor portion of said carrier air from said cycle for use in conveying the separated pulverized coal to; said blast furnace, and introducing into said cycle a quantity of heated make-up air equal to the quantity of said minor portion of said carrier air.
  • a coal preparation and conve ing system including a pulverizing zone and a separating zone comprising the steps of introducing coal into said pulverizing zone, entraining pulverized coal in a stream of carrier air in said pulveriz-ing zone, separating said pulverized coal, from said carrier air in said separating zone, circulating said carrier air in a continuous cycle through said, pulverizing, zone and said separating zone at a super-atmospheric pressure sufficiently high to overcome, the cumulative static pressure within said blast furnace and the pressure drop through said conveying sys- 1 tern, withdrawing a minor portion of said carrier air from said cycle downstream of, said separating zone in a carrier airflow sense for use in conveying the separated pulverized coal to said blast furnace, and introducing into said cycle a quantity of heated make-up air equal to the quantity of said minor portion of said carrier air further r downstream of said separating zone and upstream of said pulver
  • Apparatus for injecting pulverized coal into a blast furnace having a plurality of circumferentially spaced tuyeres positioned'in' the'lower portion thereof comprising means for introducing. a stream of hightemperature air throughsaid tuyeres into said blast furnace, and means a for injecting pulverized coal into said blast furnace including a pulverizer, means.
  • a coal and air separator for delivering a mixture of pulverized coal and air to said separator, means for returning a major portion of the separated air from said separator to said pulverizer, a coal and air mixer located beneath said separator, means for passing air through said mixer to entrain pulverized coal from said separator and to inject said air and coal mixture into said blast furnace adjacent each of said tuyeres.
  • Apparatus for injecting pulverized coal into a blast furnace having a plurality of circumferentially spaced tuyeres positioned in the lower portion thereof comprising means for introducing a stream of high temperature air through said tuyeres into said blast furnace, and means for injecting pulverized coal into said blast furnace including a pulverizer, means for delivering a controlled flow of coal to said pulverizer, means for delivering high pres-.
  • a coal and air separator means for delivering a mixture of pulverized coal and air to said separator, means for passing a minor portion of said air through a mixer to entrain pulverized coal from said separator, a distribution system for dividing the entrained pulverized coal into a plurality of streams equal in number to the number of said tuyeres, and means for conveying each of said streams to a corresponding one of said tuyeres for injection into said blast furnace.
  • Apparatus for injecting pulverized coal into a blast furnace having a plurality of circumferentially spaced tuy eres positioned in the lower portion thereof comprising means for introducing a stream of high temperature air through said tuyeres into said blast furnace, and means for injecting pulverized coal into said blast furnace including a pulverizer, means for delivering a controlled flow of coal to said pulverizer, means for delivering drying and carrier air to said pulverizer at a pressure sufiiciently high to overcome the cumulative static pressure in said furnace and the pressure drop through said pulverized coal injection means, a coal and air separator, means for delivering a mixture of pulverized coal and air to said separator, means for discharging air from said separator with a majo-r portion of siad air returned to said pulverizer, a coal and air mixer positioned beneath said separator, means for passing aminor portion of said separated air through said mixer to entrain pulverizedcoal from said
  • Apparatus for injecting pulverized coal'into a blast furnace having a plurality of circumferentially spaced tuyeres positioned in the lower portion thereof for the introduction of blast air into said blast furnace comprising means for injecting pulverized coalinto said blast furnace including an air-swept pulverizer, means for delivering a controlled flow of raw coal to said pulverizer, means for passing a fiow of high pressure carrier air through said pulverizer to entrain pulverized coal, a coal and air separator positioned adjacent said blast furnace,
  • Apparatus for injecting pulverized coal into a blast furnace having a plurality of -circumferentially spaced v tuyeres positioned in the lower portion thereof for the introduction of blast air into said blast furnace comprising means for injecting pulverized coal into said blast furnace including an air-swept pulverizer, means for delivering a controlled flow of raw coal to said pulverizer, means for passing a flow of high pressure carrier air through said pulverizer to entrain pulverized coal, a coal and air separator positioned adjacent said blast furnace, means for passing the carrier air with entrained pulverized coal from said pulverizer to said separator, a rotary seal at the bottom of said separator for the discharge of pulverized coal therefrom as the coal is separated from the carrier air, means for entraining the pulverized coal from said rotary seal in a stream of high pressure injection air, a distribution system for receiving the mixture of coal and injection air for discharge therefrom in a plurality of substantially equal streams of mixed
  • Apparatus for injecting pulverized coal into a blast furnace having a plurality of circumferentially spaced tuyeres positioned in the lower poriton thereof for the introduction of high temperature blast air into said blast furnace comprising means for injecting pulverized coal into said blast furnace including an air-swept pulverizer, means for delivering a controlled flow of raw coal to said pulverizer, means for passing a flow of high pressure carrier air through said pulverizer to entrain pulverized coal, more than one coal and air separator positioned adjacent said blast furnace, means for passing the carrier air with entrained pulverized coal from said pulverizer to the separators, a rotary seal at the bottom of each separator for the discharge of pulverized coal therefrom as the coal is separated from the carrier air, means for entraining the pulverized coal from each rotary seal in a stream of high pressure injection air, a main valve for stopping the flow of said high pressure injection air upstream of each rotary seal, a distributor cooperating

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)
US185438A 1962-04-05 1962-04-05 Pulverized coal firing method and system for blast furnace Expired - Lifetime US3150962A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE630649D BE630649A (ja) 1962-04-05
US185438A US3150962A (en) 1962-04-05 1962-04-05 Pulverized coal firing method and system for blast furnace
GB1287963A GB981996A (en) 1962-04-05 1963-04-01 Distribution system for pneumatically transported material
DEB71390A DE1257055B (de) 1962-04-05 1963-04-03 Einrichtung zum Zuteilen von pneumatisch gefoerdertem Gut in Partikelform auf eine Mehrzahl von Verbraucherstellen
ES286752A ES286752A1 (es) 1962-04-05 1963-04-04 Un sistema para la preparación y entrega de material en forma de partículas neumotransportado a múltiples puntos de empleo

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US1257055XA 1962-04-05 1962-04-05
US185438A US3150962A (en) 1962-04-05 1962-04-05 Pulverized coal firing method and system for blast furnace

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Cited By (19)

* Cited by examiner, † Cited by third party
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US3167421A (en) * 1962-06-15 1965-01-26 Pulhnan Inc Powdered solids injection process
US3204942A (en) * 1963-02-18 1965-09-07 Babcock & Wilcox Co Distributor for pneumatically transported particle-form material
US3212879A (en) * 1961-10-13 1965-10-19 Siderurgie Fse Inst Rech Process and apparatus for controlling shaft furnaces
US3240587A (en) * 1962-12-21 1966-03-15 Allied Chem Method for injecting particulate coal into a blast furnace
US3306238A (en) * 1965-05-20 1967-02-28 Armco Steel Corp Fuel injection system for blast furnaces
US3318686A (en) * 1963-07-02 1967-05-09 Koppers Co Inc Method and apparatus for transporting particulate material to a metallurgical furnace
US3371917A (en) * 1965-10-21 1968-03-05 Buell Engineering Company Inc Apparatus for feeding fuel into a blast furnace
US3971654A (en) * 1974-10-16 1976-07-27 Bethlehem Steel Corporation Method of injecting pelletized coal through blast furnace tuyeres
US4049247A (en) * 1975-08-22 1977-09-20 Claudius Peters Ag Equipment for the continuous pneumatic introduction of coal dust
EP0037460A1 (fr) * 1980-04-04 1981-10-14 Paul Wurth S.A. Procédé et dispositif de régulation de pression et de fluidisation d'une masse pulvérulente dans une enceinte de distribution
US4325312A (en) * 1979-07-17 1982-04-20 Paul Wurth S.A. Method and installation of injection of solid fuels into a shaft furnace
US4332207A (en) * 1980-10-30 1982-06-01 Combustion Engineering, Inc. Method of improving load response on coal-fired boilers
EP0059904A1 (de) * 1981-03-11 1982-09-15 Fried. Krupp Gesellschaft mit beschränkter Haftung Anlage zum Eingeben von Kohle in metallurgische Prozessgefässe mit einer Vielzahl von Einblasstellen und Verfahren zum Betreiben der Anlage
FR2516543A1 (fr) * 1981-11-18 1983-05-20 Do Nii Chernoj Metallurgii Procede d'amenee d'un melange combustible en poudre dans les tuyeres d'un haut fourneau
US4412496A (en) * 1982-04-27 1983-11-01 Foster Wheeler Energy Corp. Combustion system and method for a coal-fired furnace utilizing a low load coal burner
EP0164878A2 (en) * 1984-05-11 1985-12-18 JAMES HOWDEN & COMPANY LIMITED Method of operating metallurgical furnace
US4579068A (en) * 1984-07-23 1986-04-01 Japan Foundry Service Co., Ltd. Melting system
US5265983A (en) * 1992-06-02 1993-11-30 The Babcock & Wilcox Company Cascading pressure continuous blow bottle
US20150225804A1 (en) * 2012-09-20 2015-08-13 Mitsubishi Heavy Industries, Ltd. Pulverized-coal injection device, blast furnace facility provided with the same, and pulverized-coal supplying method

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US3212879A (en) * 1961-10-13 1965-10-19 Siderurgie Fse Inst Rech Process and apparatus for controlling shaft furnaces
US3167421A (en) * 1962-06-15 1965-01-26 Pulhnan Inc Powdered solids injection process
US3240587A (en) * 1962-12-21 1966-03-15 Allied Chem Method for injecting particulate coal into a blast furnace
US3204942A (en) * 1963-02-18 1965-09-07 Babcock & Wilcox Co Distributor for pneumatically transported particle-form material
US3318686A (en) * 1963-07-02 1967-05-09 Koppers Co Inc Method and apparatus for transporting particulate material to a metallurgical furnace
US3306238A (en) * 1965-05-20 1967-02-28 Armco Steel Corp Fuel injection system for blast furnaces
US3371917A (en) * 1965-10-21 1968-03-05 Buell Engineering Company Inc Apparatus for feeding fuel into a blast furnace
US3971654A (en) * 1974-10-16 1976-07-27 Bethlehem Steel Corporation Method of injecting pelletized coal through blast furnace tuyeres
US4049247A (en) * 1975-08-22 1977-09-20 Claudius Peters Ag Equipment for the continuous pneumatic introduction of coal dust
US4325312A (en) * 1979-07-17 1982-04-20 Paul Wurth S.A. Method and installation of injection of solid fuels into a shaft furnace
EP0037460A1 (fr) * 1980-04-04 1981-10-14 Paul Wurth S.A. Procédé et dispositif de régulation de pression et de fluidisation d'une masse pulvérulente dans une enceinte de distribution
EP0037460B1 (fr) * 1980-04-04 1983-10-05 Paul Wurth S.A. Procédé et dispositif de régulation de pression et de fluidisation d'une masse pulvérulente dans une enceinte de distribution
US4332207A (en) * 1980-10-30 1982-06-01 Combustion Engineering, Inc. Method of improving load response on coal-fired boilers
EP0059904A1 (de) * 1981-03-11 1982-09-15 Fried. Krupp Gesellschaft mit beschränkter Haftung Anlage zum Eingeben von Kohle in metallurgische Prozessgefässe mit einer Vielzahl von Einblasstellen und Verfahren zum Betreiben der Anlage
FR2516543A1 (fr) * 1981-11-18 1983-05-20 Do Nii Chernoj Metallurgii Procede d'amenee d'un melange combustible en poudre dans les tuyeres d'un haut fourneau
US4412496A (en) * 1982-04-27 1983-11-01 Foster Wheeler Energy Corp. Combustion system and method for a coal-fired furnace utilizing a low load coal burner
EP0164878A2 (en) * 1984-05-11 1985-12-18 JAMES HOWDEN & COMPANY LIMITED Method of operating metallurgical furnace
EP0164878A3 (en) * 1984-05-11 1987-03-04 James Howden & Company Limited Method of operating metallurgical furnace and a metallurgical furnace apparatus
US4689076A (en) * 1984-05-11 1987-08-25 James Howden & Company Limited Method of operating metallurgical furnace and a metallurgical furnace apparatus
US4579068A (en) * 1984-07-23 1986-04-01 Japan Foundry Service Co., Ltd. Melting system
US5265983A (en) * 1992-06-02 1993-11-30 The Babcock & Wilcox Company Cascading pressure continuous blow bottle
US20150225804A1 (en) * 2012-09-20 2015-08-13 Mitsubishi Heavy Industries, Ltd. Pulverized-coal injection device, blast furnace facility provided with the same, and pulverized-coal supplying method

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DE1257055B (de) 1967-12-21

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