CN85108708B - Oxygen lance for secandary feeding oxygen to convertor - Google Patents

Abstract

The oxygen lance for secandary feeding oxygen to convertor device is applied to the oxygen supply of oxygen blast metallurgical converter secondary.Whole device is formed by connecting water-cooled red copper flow splitter under the water-cooled red copper oxygen supply pipe, the oxygen tap hole that is distributing on the oxygen flow splitter and be not quite similar with vertical angle, after oxygen sprays from tap hole, forming one above the molten bath in stove is the oxygen cylinder of central shaft with the oxygen rifle, make the high temperature CO gas secondary combustion equably of overflowing in the molten bath, reach the raising bath temperature, improve the purpose of blowing.

Description

Oxygen lance for secandary feeding oxygen to convertor

The present invention is applied to the oxygen blast metallurgical converter, is intended to make the evenly secondary apparatus of oxygen supply that moves up and down of oxygen supply top gun relatively vertically downward of secondary combustion for oxygen converter provides.

Employing is blown into the method that the low-carbon (LC) metal is produced in the decarburization of high-carbon metal liquid with pure oxygen, its process has typical characteristics, carbon in the liquid metal and the oxygen reaction that is blown into constantly generate high temperature oxidation carbon gas evolution, until the metal product that obtains required carbon content.In the most of the time of blowing, in the carbon oxide gas of effusion metal pool, the ratio of CO is quite high, because satisfy the requirement of blowing technology, the shortage of heat one that maybe will compensate when blowing is such as, pure oxygen top blast, during the top bottom blowing low carbon ferrochromium, the not high meeting of temperature causes chromium metallic element severe oxidation in the molten bath, and high-melting-point chromic oxide slag is sticked on the furnace wall, is difficult for flowing in the molten bath reclaiming; In the pure oxygen top bottom blowing steel, the improvement of blowing dynamic conditions makes the chemical reaction heat minimizing of other elements such as manganese, and it is like that to have reduced the blowing scrap ratio, all has one to increase heat, improves bath temperature, improves the problem of steel-making converter scrap ratio.So in recent years, the various countries metallargist had made very big effort on the method for exploring this class problem of solution., just generate the high temperature CO gas of overflowing after carbon and the oxygen primary first-order equation in the generation dependence molten bath therebetween, in stove, carry out the secondary combustion heat release above the molten bath with oxygen, the imagination that makes the molten bath be heated and heat up, the required oxygen of supply secondary combustion just is called the secondary oxygen supply.

" iron and steel producer " ((U.S.) Iron and Steelmaker) the 8th phase in 1984, published Holland's first Application secondary combustion principle on the compound blow converter in the pure oxygen top blast end, top, being heated up in the molten bath increases the report of scrap ratio, and the device of this enforcement secondary oxygen supply is a Converter Oxigen Blowing top rifle through transforming.Be socketed on the original top rifle with a pipe that is boring six circular holes, between former top rifle and this pipe, inserting the six roots of sensation one end and vertical angle and be 45 ° with top holster pipe on the oxygen supply tubule that welding of circular hole.During blowing, former spray gun is an oxygen supply vertically downward, the then side direction secondary oxygen supply of the thin oxygen pipe of the six roots of sensation.This secondary oxygen supply mode, oxygen is skewness in stove, and secondary combustion is insufficient, causes furnace wall localized hyperthermia to deteriorate easily, reduces lining life.And, the tubule of six roots of sensation secondary oxygen supply because can only with former top rifle knee-action together, secondary oxygen supply position different are required incompatible with the variation of new and old variation of converter furnace bottom and blowing situation.

Equally, " oxygen coverter material steel scrap " (" MeTa л л о л о м в ш и х т e к и с л о р о п м ы х к о н в e р т e р о в that the Soviet Union publishes nineteen eighty-two, 1982 ") described secondary apparatus of oxygen supply, identical with above-mentioned device, also exist these defectives.

Main purpose of the present invention will provide exactly and make secondary combustion even, relatively vertically downward the secondary oxygen supply oxygen rifle that moves up and down of oxygen supply top gun.At this, explain concrete design represented in the illustration, so that set forth the present invention.

Fig. 1 is the axial elevation cross-sectional view of secondary oxygen supply oxygen rifle.

Fig. 2 is a water-cooled oxygen flow splitter.

As shown in Figure 1, secondary oxygen supply oxygen rifle is made up of water-cooled red copper oxygen supply pipe 9 and water-cooled red copper oxygen flow splitter 10, is enclosed within vertically downward on the oxygen supply top gun 1 and between the oxygen rifle 1 slot is arranged, can be manual, electronic, pneumatic or the relative oxygen rifle 1 of hydraulic pressure move up and down.

In the present invention, oxygen supply pipe 7 is concentric inner sleeves of red copper water-cooled tube 8, connect the annular oxygen hose 5 in the oxygen flow splitter 10 down, water-cooled tube 8 and peripheral zone semi-round ring shape water-cooled tube welding jaggy, the welding of both sides up and down of the breach 3 of annular oxygen hose 5 and annular cooling water pipe 6, distributing with vertical angle on annular oxygen hose 5 peripheries at breach 3 places is 30～90 ° oxygen tap hole 4.

As shown in Figure 2, oxygen from annular oxygen hose 5 with vertical angle 30-90 ° tap hole 4 after the ejection, forming one above the molten bath in converter is the oxygen cylinder of central shaft with the oxygen rifle.The high temperature CO gas of overflowing from the molten bath fully contacts in bigger space with oxygen, impels the even secondary combustion of CO gas, reaches the purpose of rising bath temperature.

Relevant technologies with the existing Holland and the Soviet Union is compared, and the present invention's secondary apparatus of oxygen supply can move up and down with respect to the top rifle of oxygen supply vertically downward, can adapt to the different requirements of the variation of new and old variation of furnace bottom and blowing situation to secondary oxygen supply position; After secondary oxygen sprays, in stove, form uniform secondary combustion above the molten bath from the water-cooled flow splitter, make the furnace lining thermally equivalent, influence under the condition of lining life, reach the purpose of rising bath temperature not causing localized hyperthermia to deteriorate.

At secondary oxygen supply oxygen rifle with vertically downward between the oxygen supply top gun 1, leave the slit that guarantees that the relative top of secondary oxygen supply oxygen rifle rifle 1 is manual, electronic, pneumatic or hydraulic pressure moves up and down, be 2-3mm.

The semi-round ring shape water-cooled tube is made up of red copper semicircle pipe 6 and two copper sheets 2 and annular oxygen hose 5 a peripheries part.Up and down cover plate 2 in same plane and horizontal plane tilt 30 join with the brazing of semicircle pipe after, vacate breach 3 one, again with annular oxygen hose 5 with breach two contour brazings connection 3 about.Radially two ends above horizontal semi-round ring shape water-cooled tube, a diameter is respectively opened with the identical circular hole of water-cooled tube 8 diameters in the vertical ring plane, and by these two circular holes, on annular oxygen hose 5, open two diameters with the identical concentric circle holes of oxygen supply pipe 7 diameters, with the hole welding jail of opening on oxygen supply pipe 7 and water-cooled tube vertical ring plane and annular oxygen hose 5 and the semi-round ring shape water-cooled tube.Two oxygen supply pipe 7 isobaric oxygen supplys simultaneously; 8 water inlets of two water-cooled tubes divide two-way by flowing out from another root behind the flow splitter.

The oxygen tap hole 4 that distributing on the annular oxygen hose between the cover plate 2 up and down, tap hole 4 is 30-90 ° with vertical angle.The tap hole 4 of different angle with the combustion efficacy of cyclic sequence successively for well, when to adopt angle be 30,45,60 and 90 ° tap hole 4, cyclic sequence be 30,45,60,90 ° again 30,45,60,90 ° analogize.

Claims (6)

1, a kind of secondary oxygen supply oxygen rifle that is used for converter.This oxygen rifle is provided with the tap hole that becomes 30-90 ° of angle with vertical direction by forming with respect to the all-in-one-piece red copper water-cooled oxygen supply pipe in parallel and the red copper water-cooled flow splitter of the upper and lower motion of oxygen supply top gun on the periphery of said flow splitter.

Make by red copper as the said oxygen supply piping of claim 1.

But cold as the said oxygen supply piping of claim 1 water.

Make by red copper as the said shunting ring system of claim 1.

But cold as the said shunting ring system of claim 1 water.

Be located at tap hole on the flow splitter and the angle of vertical direction is 30-90 ° as claim 1 is said.

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