EP0024637B2 - Procédé de mise en oeuvre d'une soupape de commutation de l'alimentation d'une tuyère d'un convertisseur pour la fabrication de l'acier - Google Patents

Procédé de mise en oeuvre d'une soupape de commutation de l'alimentation d'une tuyère d'un convertisseur pour la fabrication de l'acier Download PDF

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Publication number
EP0024637B2
EP0024637B2 EP80104793A EP80104793A EP0024637B2 EP 0024637 B2 EP0024637 B2 EP 0024637B2 EP 80104793 A EP80104793 A EP 80104793A EP 80104793 A EP80104793 A EP 80104793A EP 0024637 B2 EP0024637 B2 EP 0024637B2
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European Patent Office
Prior art keywords
oxygen
fuel
nozzle
valve
tuyere
Prior art date
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Expired - Lifetime
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EP80104793A
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German (de)
English (en)
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EP0024637B1 (fr
EP0024637A1 (fr
Inventor
Hans-Georg Dr.-Ing. Fassbinder
Karl Dr.-Ing. Dr.-Ing. E.H. Brotzmann
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Kloeckner CRA Patent GmbH
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Eisenwerke Gesellschaf Maximilianshuette mbH
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Priority claimed from DE19792934333 external-priority patent/DE2934333A1/de
Priority claimed from DE19792949801 external-priority patent/DE2949801C2/de
Application filed by Eisenwerke Gesellschaf Maximilianshuette mbH filed Critical Eisenwerke Gesellschaf Maximilianshuette mbH
Priority to AT80104793T priority Critical patent/ATE3564T1/de
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Classifications

    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/57—Gasification using molten salts or metals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/15—Details of feeding means
    • C10J2200/152—Nozzles or lances for introducing gas, liquids or suspensions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/36—Moving parts inside the gasification reactor not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/0943—Coke
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0983—Additives
    • C10J2300/0996—Calcium-containing inorganic materials, e.g. lime

Definitions

  • the invention relates to a method for operating a changeover valve for the supply of a nozzle with protective media jacket below the bath surface in a steel production converter with oxygen and fine-grained, carbonaceous fuel, which is suspended in a carrier gas that allows it to alternate through the oxygen inlet channel of the nozzle Add fuel or oxygen.
  • lances are used for blowing in, the outlet openings of which are guided close to the surface of the bath, so that the solids get into the melt with the exit impulse, or the lances are immersed in the iron bath.
  • nozzle arrangements are known which are located below the bath surface in the refractory masonry, through which solids suspended in carrier gases are fed to the melt.
  • German Laid-Open Specification 2 316 768 describes, for example, a method and a device for fresh ironing, in which oxygen and fine lime are added through nozzles arranged below the bath surface and solid carbon carriers are added to the melt through further nozzles.
  • a nozzle can also be provided with a plurality of openings, one opening being charged with carrier gas and carbon or fine ore and another opening with fresh gas and fine lime.
  • German patent specification 2 401 540 deals with a method for melting sponge iron.
  • the reactants namely oxygen, dust-like carbon and fine-grained sponge iron
  • the nozzle has several feed channels, e.g. flow in several feed channels, e.g. flow in the inner oxygen, in the middle carbon and in the outer sponge iron.
  • Carbon and sponge iron are suspended in a suitable carrier gas, such as carbon monoxide.
  • German Patent Specification 2,520,883 describes a method and a device for the continuous gasification of coal.
  • the reactants preferably fine-grained coal and oxygen
  • the reactants are fed to the iron bath through nozzles below the bath surface, which are arranged in the refractory lining and thus wear out in unison.
  • Inert gas, nitrogen, CO 2 and water vapor come into consideration as the conveying gas for the carbon.
  • the reactants can be passed through a multi-channel nozzle, preferably from concentric tubes. For the first time, the possibility is mentioned that the reactants oxygen and coal can be mixed within the nozzle shortly before the nozzle mouth.
  • German laid-open specification 27 56 432 describes a method and a device for increasing the scrap rate.
  • gaseous or liquid hydrocarbons can be supplied via a valve.
  • the reliable introduction of fuel and oxygen in alternation is not mentioned in this document.
  • German Offenlegungsschrift 2,723,857 relates to a method and an apparatus for steel production.
  • Solid, carbon-containing material is conducted into the melt below the surface and an oxidizing gas is introduced into the vessel.
  • the carbonaceous material is blown through blowpipes using a carrier gas.
  • the carrier gas can be a reducing, oxidizing or inert gas.
  • the oxygen is normally delivered to the metallurgical vessel through a water-cooled lance.
  • it is also possible to supply the oxygen by blowing tube injection or by injection using a submerged lance.
  • blowpipes are used to inject oxygen and / or solid, carbonaceous materials
  • the blowpipes can consist of two or more concentric tubes and have a circular liquid shield that surrounds the primary injection tube.
  • This shielding fluid can an inert gas or a liquid, e.g. hydrocarbon gas or a liquid, or an oxidizing gas or a liquid, and the fluid can be chosen so that wear of the liner and the blowpipes is kept as low as possible in order to block the blowpipes
  • the blowpipes can be designed so that they can supply both oxidizing gas and solid, carbon-containing material ". It is then said further in the specific embodiment 1 that particulate graphite was blown in at a rate of 2.5 kg / min for 17 minutes.
  • blowpipes used for blowing carbon had a circular cross section and were charged as follows: shielding gas: air at a rate of 7 m 3 / h; Carrier gas: argon at a rate of 30 m 3 / h.
  • the blow tube core diameter was 7 mm with an annular gap of 1 mm.
  • the known methods for introducing carbonaceous fuels into an iron melt have in common that the finely divided solids suspended in a carrier gas are fed separately from the oxygen to the melt through their own feed channels.
  • This feed box channels are adapted in cross-section to the flow rate and accordingly correspondingly small, for example the diameter of the blow pipe is 7 mm.
  • the risk of blockages increases. Mainly if finely divided fuels with different grain sizes and fluctuations in the grain size distribution are used at high loading rates from solids to carrier gas for economic reasons, there is a risk of grafting, which leads to blockages in narrow delivery lines.
  • Another difficulty with the known induction methods is keeping the feed channels clear in periods without fuel delivery, e.g. when finishing a molten steel, if you set the desired low final carbon content.
  • the carrier gas usually flows through the feed channels without solid loading in order to prevent melt from penetrating into the nozzles.
  • the carrier gas extracts heat from the melt and, depending on the type of gas, can also have an unfavorable effect on the steel composition, e.g. due to increased nitrogen levels in the finished steel.
  • the invention is therefore based on the object to provide a method for operating a changeover valve for supplying a nozzle with oxygen and fine-grained, carbonaceous fuel, in which the reliable, trouble-free addition of fuels below the bath surface is guaranteed over long periods, clogging of the nozzle are avoided and the nozzles are kept clear during fuel-free operating periods.
  • valve switchover is carried out by one of the media to be conveyed itself.
  • the method according to the invention is characterized by high operational reliability, and the inlet nozzles for finely divided, carbon-containing fuels below the bath surface do not become clogged.
  • the fuel delivery is switched over to oxygen and the nozzle channel is thus blown free. Formations at the nozzle mouth, which often form the starting point for blockages, are burned off by the oxygen flow.
  • the shortest oxygen blowing times are sufficient, for example from 0.1 to about 2 minutes. The oxygen blowing times can be varied as desired and, in particular, can be extended longer before the supply of fuel and carrier medium is started again.
  • the change from fuel to oxygen can occur several times in short succession. This procedure is particularly useful if the oxygen blowing times are to be short. As soon as the fuel delivery runs smoothly again after a brief burst of oxygen of, for example, 10 s, another acid is unnecessary addition of fabric. Otherwise, the short-term addition of oxygen can be repeated a corresponding number of times.
  • the switchover of oxygen bubbles to the suspension conveyance e.g. of nitrogen and dusty coal, is carried out almost without inertia by means of corresponding switchover devices, which are arranged in the immediate vicinity of the nozzle mounting flanges, in any case directly on the bottom of the treatment vessels, for example an iron bath reactor or a convertor for steel production.
  • a simple form of the inlet nozzle for the suspension of finely divided, carbonaceous fuel and a carrier medium on the one hand and oxygen on the other hand consists of two concentric tubes, the fuel and alternately the oxygen flowing through the central tube.
  • the annular gap, formed from the central tube and the second concentric tube is charged with, for example, 0.5 to 5% by weight of gaseous and / or liquid hydrocarbons, based on the oxygen.
  • This nozzle is usually installed in the fireproof masonry below the bath surface and burns back evenly with the lining.
  • the risk of nozzle clogging when introducing carbon-containing, pulverized fuels into an iron smelter is practically excluded, and for this reason the installation of the blow cross section actually required is sufficient to introduce the suspension, that is, the additional installation of further fuel introduction nozzles is unnecessary for safety reasons.
  • the installation of the blow cross section actually required is sufficient to introduce the suspension, that is, the additional installation of further fuel introduction nozzles is unnecessary for safety reasons.
  • it has proven to be completely sufficient to convert only two of the ten oxygen inlet nozzles present in the converter base for the addition of fine-particle coal or coke. Through these two nozzles, about 2000 kg of coal dust can be fed to an iron melt of about 65 t within 10 minutes. Nitrogen is used as the carrier medium, for example, and the loading rate is about 12 kg of coal dust / Nm 3 of nitrogen.
  • the addition of fuel serves to increase the heat balance in order to increase the scrap melting capacity in steel production.
  • supply tubes of 10 mm inside diameter are installed in the center in the ten oxygen inlet nozzles mentioned in each nozzle as a delivery channel for the fuel-carrier gas suspension.
  • the oxygen inlet nozzles themselves are constructed from two concentric tubes, in which the inner tube with a clear diameter of 24 mm is used to supply oxygen or oxygen and lime dust.
  • the arrangement of the fuel supply channels in the oxygen tube has been found to be disadvantageous for several reasons.
  • the installation and supply of the ten fuel inlet pipes is procedurally complex, but is required with this fuel inlet method in order to avoid malfunctions in individual feed channels, e.g.
  • Blockages to keep a sufficient delivery cross-section for the carbon-containing fuels operational Blockages on individual fuel introduction channels occurred in almost every batch. Furthermore, it turned out to be particularly unfavorable to have to keep these channels clear with carrier gas if the fuel delivery is stopped towards the end of the cycle.
  • the nitrogen used to fuel the fuel led to undesirably high nitrogen contents in the molten steel.
  • Other carrier gases, such as argon or methane, are expensive compared to nitrogen and also require costly installations for another medium on the converter system. Nitrogen is usually available on an oxygen blow-through converter.
  • carrier gas blowing without fuel loading leads to a deterioration in the heat balance in steel production. The heat for heating the carrier gas is lost as energy for melting the scrap.
  • the method according to the invention makes it possible, for example, to further increase the operational safety of an iron bath recorder for the continuous gasification of coal, as is described in German patent specification 2 520 883.
  • an iron bath reactor large amounts of coal are converted to gas, consisting essentially of CO and H 2 .
  • the reactants carbon rod and oxygen are normally added through nozzles consisting of several concentric tubes which are arranged below the surface of the iron bath.
  • the suspension of finely divided coal and a conveying gas, for example CH 4 usually flows through the central tube, oxygen through the annular gap around the central tube and the nozzle protection medium, for example natural gas, through a further annular gap.
  • a particularly advantageous application of the invention consists in combining it with the method for supplying heat during steel production in the converter, described in German patent application P 2 838 983.5.
  • the steel is produced in the converter by the carbon-containing melt
  • the oxygen for freshening the melt and for burning the fuels is introduced simultaneously into the converter as gas jets directed onto the bath surface and below the bath surface.
  • coke, brown coal coke, graphite, coal of various qualities and mixtures thereof are used as carbon-containing fuels.
  • These carbon-containing fuels are preferably introduced in powder form below the bath surface into the iron melt of the converter together with a carrier gas.
  • Nitrogen, CO, CH 4 or natural gas and inert gas, for example argon, have proven suitable as carrier gases.
  • the suspension of carbon-containing fuels and a carrier gas can also be supplied via one or more nozzles in an oxygen blow-through converter, the inlet tube of individual nozzles being charged with the suspension of fuel and carrier gas instead of oxygen.
  • the method according to the present invention now overcomes the disadvantages which still exist hitherto in the known supply of finely divided, carbon-containing fuels into an iron or steel melt, as they also adhere to the otherwise very advantageous process of supplying heat according to German patent application P 2 838 983.5.
  • the method according to the invention is suitable for introducing a wide variety of fine-grained fuels, for example coal of different quality, coke, brown coal coke, graphite, refining residues and mixtures of these fuels.
  • the fuels are supplied in powdered or granular form, whereby the grain size and grain size distribution can be varied within wide limits.
  • Inert gases such as argon, nitrogen, carbon monoxide, carbon dioxide, hydrocarbons such as methane, natural gas and water vapor are particularly suitable as carrier gas.
  • the method according to the invention is not restricted to the introduction of oxygen, but is also suitable for the introduction of other oxygen-containing gases, in particular air, and mixtures of oxygen and other gases, in particular oxygen with argon.
  • only a part of the total number of nozzles which are arranged below the iron bath surface in a treatment vessel are used as inlet nozzles for the carbon-containing fuels.
  • the method according to the earth's infection in which a change from fuel to oxygen and vice versa takes place in the same nozzle channel, can also be applied to other processes in which carbon-containing fuels are introduced into an iron melt.
  • the existing pressure in the oxygen supply system i.e. the oxygen admission pressure, which is normally of the order of 20 bar, serves to switch over the valve.
  • the oxygen admission pressure is reduced in the valve itself to the oxygen blowing pressure of the nozzle.
  • the moving valve body only opens the oxygen opening cross-section for the nozzle when oxygen pressure is present.
  • the prevailing oxygen admission pressure is reduced by a certain amount, which can be set by means of a spring, of 0.5 to 10 bar, preferably 2 bar, above the oxygen blowing pressure of the nozzle, only the fuel opening cross section to the nozzle is released.
  • the changeover valve is located in the immediate vicinity of the nozzle on the converter, between the converter axis of rotation and the nozzle, in particular in a structural unit with the nozzle itself, assembled.
  • the changeover valve is preferably attached directly to the mounting flange of the nozzle.
  • the proven double-tube nozzles with protective medium coating are normally used as nozzles.
  • the oxygen usually flows through the central tube.
  • the method according to the invention allows oxygen or fuel to be passed alternately through this nozzle channel, ie in this case the central nozzle tube, and to switch from fuel to oxygen as often as desired.
  • Gases and / or liquids can be used as a protective medium.
  • Carbon dioxide such as methane, natural gas, propane, butane, light heating oil and other types of oil are preferred.
  • the proportion of hydrocarbons, based on the oxygen throughput, is low and is between 1 and 5% by weight.
  • the method for operating the changeover valve according to the invention is not limited to this type of nozzle, but rather can be used for each inlet nozzle in the converter area for switching from oxygen-containing media to fine-shaped carbon-containing media.
  • the switching valve can e.g. can be used in conjunction with the so-called ring slot nozzle according to German Patent 2,438,142.
  • a preferred method of operating the switching valve is to use certain double tube nozzles, e.g. to operate two of a total of ten, which are installed in the converter floor of an oxygen blow-through converter, briefly with oxygen, then over a longer period of, for example, 8 minutes with a suspension of powdered, carbon-containing fuels and a carrier gas and then against freshness, for example 5 minutes to prevent oxygen again.
  • Coke, lignite coke, graphite, coal of various qualities and mixtures thereof in the finely divided state of up to about 1 mm grain size have proven themselves as carbon-containing fuels.
  • the changeover valves have proven to be extremely reliable, for example the valves over 1000 batches could be used in the described mode of operation without malfunctions.
  • Pneumatically or electrically controllable valves for medium switching are common and are widely used.
  • the known valves for reversing require an additional line for the control medium.
  • difficulties arise because of the relatively high ambient temperature of up to 300 ° C. and, moreover, due to the need to supply an additional control line. These lines must be brought to the converter via a rotating union in the converter pivot.
  • the oxygen pressure in the valve acts on a movable valve body, which closes the fuel opening cross-section to the changeover valve in a gas-tight manner. In this position of the movable valve body, oxygen can reach the nozzle channel through the oxygen opening cross section.
  • the oxygen opening cross-section is dimensioned such that it acts as a throttle element and reduces the oxygen admission pressure to the oxygen nozzle pressure. This reduction in pressure, for example from 20 bar upstream pressure to 4 bar nozzle pressure, determines the cross section of the oxygen opening to the amount of oxygen flow.
  • the oxygen opening cross-section is fixed at the changeover valve. However, this setting can be changed relatively easily according to the desired pressure conditions.
  • the changeover valve switches using the movable valve body.
  • the oxygen opening cross section is closed gas-tight and the fuel opening cross section is released.
  • the pressure difference between the oxygen pre-pressure, e.g. 20 bar, and the oxygen pre-pressure reduction at which the switching process is triggered is set via a spring in the valve by a value between 0.5 to 10 bar, preferably 2 bar, above the oxygen blowing pressure of the nozzle, for example 4 bar, in the changeover valve and is consequently, for example, 6 bar.
  • This triggering of the switching process by means of a pressure difference that can be selected within the specified limits of 0.5 to 10 bar via the oxygen blowing pressure of the nozzle has the advantage that, in the event of slow pressure reduction in the oxygen pre-pressure line, no intermediate position or fluttering of the movable valve body occurs, in which both oxygen and Fuel can get into the nozzle channel at the same time.
  • the oxygen supply line is preferably connected to a valve chamber which has a boundary wall which permits a change in length of the valve chamber under oxygen gas pressure, the displaceable end of the valve chamber is connected to a double-acting valve body which monitors the fuel opening cross section on the one hand and the oxygen opening cross section on the other hand, and the valve body is so preloaded that the oxygen opening cross section is closed.
  • the preloading of the valve body can be brought about by a spring or by equivalent means, such as a pneumatic pre-pressure.
  • the valve body is preferably arranged coaxially in the fuel supply line.
  • the boundary wall is preferably formed by a bellows.
  • the parts of the device through which oxygen flows are sealed gas-tight against the parts through which fuel flows.
  • a throttle element is provided which determines the cross section of the oxygen opening.
  • the figure shows a longitudinal section through a changeover valve, for use in the method according to the invention.
  • the changeover valve comprises a stationary housing 1 (shown hatched), with an oxygen feed line 3, in which the oxygen admission pressure prevails when oxygen is supplied to the nozzle tube 4.
  • the movable valve body 5 shown in hatched lines
  • the fuel opening cross section 6 is released so that the fuel, for example a carbon / nitrogen suspension, can pass from the fuel line 7 to the nozzle line 4.
  • the feed gas serves as the conveying gas for the powdered carbon, for example coke, nitrogen or inert gas, for example argon.
  • the feed gas has a pressure of about 3 bar without a load and a pressure of about 12 bar with a full load of 17 kg of carbon per Nm 3 .
  • the movable valve body 5 moves in the direction of the fuel supply line 7 and closes the fuel opening cross section 6 by means of the sealing means 8 in cooperation with the contact surface 9.
  • the oxygen opening cross section 10 is released and oxygen flows into the nozzle tube 4.
  • the oxygen opening cross section 10 can be adjusted accordingly by different bore diameters 10 in the perforated disk of the throttle element 11.
  • the movable valve body 5 moves back into the position shown and releases the fuel opening cross section 6 .
  • the pressure difference for triggering the switching process is set in the described embodiment by the spring force of the spring 13.

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
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Claims (2)

1. Procédé de fonctionnement d'une soupape d'inversion pour l'alimentation d'une buse à enveloppement par fluide de protection, au dessous de la surface d'un bain, dans un convertisseur de production d'acier fonctionnant à l'oxygène et avec un combustible carboné finement granulé, qui est en suspension dans un gaz vecteur, qui permet d'amener en alternance par le canal d'introduction de l'oxygène de la buse du combustible ou de l'oxygène, dans lequel, dans un carter (1) comportant une conduite d'amenée de combustible (7), une conduite d'amenée d'oxygène (3) et un tube de buse (4), est disposé un corps de soupape mobile (5) qui libère la section transversale de l'ouverture pour le combustible (6) ou la section transversale de l'ouverture pour l'oxygène (10), et où:
a) la pression amont de l'oxygène est exploitée pour effecteur la manoeuvre d'inversion de la soupape,
b) cette pression amont est réduite dans la soupape même à la valeur de la pression d'insufflation de l'oxygène de la buse (4),
c) la réduction de la pression amont de l'oxygène à la valeur de la pression d'insufflation de l'oxygène s'effectue au moyen d'un organe d'étranglement (11) à section transversale d'ouverture pour l'oxygène (10) définie, pouvant être réglée à une valeur fixe, qui est disposé devant la buse (4) dans le canal de passage de l'oxygène de la soupape,
d) dans le cas de la présence d'une pression amont d'oxygène, seule la section d'ouverture pour l'oxygène (10) pour la buse (4) est ouverte au moyen du corps de soupape mobile (5),
e) ou, dans le cas d'une réduction de la pression amont d'oxygène disposible, d'une valeur déterminée, allant de 0,5 à 10 bar au-dessus de la pression d'insufflation de l'oxygène de la buse (4), seule la section transversale d'ouverture pour le carburant (6) allant à la buse (4) est libérée,
f) les éléments de construction de la soupape qui sont parcourus par l'oxygène sont isolés de manière étanche aux gaz vis-à-vis des parties de la soupape qui sont parcourues par le combustible, et
g) la soupape d'inversion est prévue sur le convertisseur, entre l'axe de rotation du convertisseur et la buse (4).
2. Procédé selon la revendication 1, caractérisé en ce que la valeur réglable de réduction de la pression amont d'oxygène existante est de 2 bar.
EP80104793A 1979-08-24 1980-08-13 Procédé de mise en oeuvre d'une soupape de commutation de l'alimentation d'une tuyère d'un convertisseur pour la fabrication de l'acier Expired - Lifetime EP0024637B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104793T ATE3564T1 (de) 1979-08-24 1980-08-13 Verfahren und vorrichtung zum einleiten feinkoerniger, kohlenstoffhaltiger brennstoffe in eine eisenschmelze.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2934333 1979-08-24
DE19792934333 DE2934333A1 (de) 1979-08-24 1979-08-24 Verfahren zum einleiten gemahlener, kohlenstoffhaltiger brennstoffe in eine eisenschmelze
DE19792949801 DE2949801C2 (de) 1979-12-11 1979-12-11 Umschaltventil für die Versorgung einer Düse an einem Strahlerzeugungskonverter mit Sauerstoff oder Brennstoff
DE2949801 1979-12-11

Publications (3)

Publication Number Publication Date
EP0024637A1 EP0024637A1 (fr) 1981-03-11
EP0024637B1 EP0024637B1 (fr) 1983-05-25
EP0024637B2 true EP0024637B2 (fr) 1990-12-27

Family

ID=25780711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104793A Expired - Lifetime EP0024637B2 (fr) 1979-08-24 1980-08-13 Procédé de mise en oeuvre d'une soupape de commutation de l'alimentation d'une tuyère d'un convertisseur pour la fabrication de l'acier

Country Status (7)

Country Link
US (2) US4330326A (fr)
EP (1) EP0024637B2 (fr)
CS (1) CS219289B2 (fr)
DD (1) DD152809A5 (fr)
DE (1) DE3063501D1 (fr)
PL (1) PL126621B1 (fr)
RO (1) RO81346B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3143795C2 (de) * 1981-11-04 1983-10-20 Klöckner Stahlforschung GmbH, 8458 Sulzbach-Rosenberg "Ventil zur Strömungsmittelzufuhr"
US4693274A (en) * 1984-05-09 1987-09-15 Instituto Mexicano De Investigaciones Siderurgicas Device for the selective injection of an oxidizing gas or a carrier gas with or without carbonaceous material to a liquid metal bath
AT403772B (de) 1996-08-27 1998-05-25 Holderbank Financ Glarus Verfahren zum aufarbeiten von müll sowie vorrichtung zur durchführung dieses verfahrens

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805147A (en) * 1952-10-02 1957-09-03 Tiroler Roehren & Metallwerk Process and apparatus for introducing fine-grained additions below the surface of metal melts
US2806781A (en) * 1955-01-20 1957-09-17 Air Reduction Method and apparatus for conveying finely-divided material
DE1916945C3 (de) * 1969-04-02 1980-04-17 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Anwendung des Mantelgas-Verfahrens zum Frischen von Roheisen zu Stahl
US3997334A (en) * 1972-04-28 1976-12-14 Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie Introduction of a liquid into a receptacle such as a converter
US3809381A (en) * 1972-07-10 1974-05-07 Steel Corp Lime oxygen-natural gas distribution system
DE2316768B2 (de) * 1973-04-04 1977-03-03 Fried. Krupp Gmbh, 4300 Essen Verfahren zum frischen von metallen, insbesondere roheisen, und vorrichtung zur durchfuehrung des verfahrens
DE2326754C3 (de) * 1973-05-25 1978-04-20 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Vorrichtung zum gesteuerten Zuführen eines Frischgases und eines fluiden Schutzmediums
US3955966A (en) * 1974-03-06 1976-05-11 August Thyssen-Hutte Ag Method for dispensing a fluidizable solid from a pressure vessel
FR2292771A1 (fr) * 1974-11-28 1976-06-25 Creusot Loire Methode d'injection d'une poudre apportant du carbone dans un bain metallique
US4045213A (en) * 1974-11-28 1977-08-30 Creusot-Loire Method of injecting a powder containing carbon into a metal bath
DE2520883B2 (de) * 1975-05-10 1979-07-05 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Verfahren und Vorrichtung zur kontinuierlichen Vergasung von Kohle oder kohlenstoffhaltigen Brennstoffen in einem Eisenbadreaktor
GB1586762A (en) * 1976-05-28 1981-03-25 British Steel Corp Metal refining method and apparatus
FR2378867A2 (fr) * 1977-02-01 1978-08-25 Creusot Loire Procede et dispositif de soufflage, par des jets d'impulsions differentes, pour le traitement des metaux liquides
US4264059A (en) * 1980-03-12 1981-04-28 Victor Benatar Condition responsive control means for use in discharging powdered reagent into a pool of molten metal
US4277279A (en) * 1980-03-24 1981-07-07 Jones & Laughlin Steel Corporation Method and apparatus for dispensing a fluidized stream of particulate material

Also Published As

Publication number Publication date
RO81346A (fr) 1983-04-29
RO81346B (ro) 1983-04-30
DD152809A5 (de) 1981-12-09
CS219289B2 (en) 1983-03-25
DE3063501D1 (en) 1983-07-07
PL226364A1 (fr) 1981-08-07
US4330326A (en) 1982-05-18
EP0024637B1 (fr) 1983-05-25
US4407490A (en) 1983-10-04
EP0024637A1 (fr) 1981-03-11
PL126621B1 (en) 1983-08-31

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