JPS59502109A - metal bottom blowing tuyere - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] metal bottom blowing tuyere Technical field The present invention relates to metallurgy, and in particular to a tuyere for blowing gas into metal from the bottom. It is.

Background technology Panels consisting of at least two tubes arranged concentrically are known.

When blowing gas into metal using a double-pipe tuyere, the outside near the tuyere The current opening on the side tends to accumulate scum, and in order to feed gaseous fuel, the above-mentioned adhesion must be removed. The slag will have to pass through. When the slag adheres, the flow of the gaseous fuel is interrupted. Since it becomes a jet flow, it has an adverse effect on the above-mentioned gas blowing operation. In such cases, Injection of gas may also cause spillage of metal and slag. Not only that, but also slag may block the above-mentioned current opening and cause unexpected damage to the above-mentioned tuyere. Ru. Generally, the above-mentioned slag adhesion tends to occur at the beginning of gas blowing work, and the metal temperature is relatively low. This adhered slag will melt away as the temperature rises.

This slag build-up can be reduced by using various types of helical members; The helical member is inserted into the oxygen gas passage of the tuyere, and its main purpose is to The flow of oxygen gas coming out of the tuyeres is divided, thereby making the gas blowing “softer”. ” to reduce spillage of metal and slag.

Tuyeres used in converters are also known. This tuyere has a tube and a spiral member. Ru. The spiral member is a helical plate-like member and is inserted into the tube. this tube is for passing gaseous fuel or oxygen gas.

In this case, the kinetic energy of the oxygen gas jet is reduced by the swirl member. There is a risk that molten metal will enter the tuyeres.

Other tuyeres for blowing gas into metal from the bottom are also known. this feather The mouth has at least one tube, which tubes are arranged in concentric circles. Inside this tuyere There is a passageway in the center for the passage of oxygen, and around this central passageway there is a passage for fuel and other liquids. A plurality of tubes are provided for passing gaseous or gaseous substances. The central passage of the above tuyere A spiral guide member is arranged in the path.

A disadvantage of the tuyere described above is that slag adheres to the portion of the converter close to the tuyere. the The causes are as follows. The gaseous fuel is forced into the narrow passages of the tuyeres. This prevents the fuel pipe from burning out when the fuel is injected, but at the same time prevents the narrow passage for fuel injection. The area around the bottom of the outer tuyere is also cooled. Therefore, the above slag is placed in this part. The deposited slag almost completely blocks the narrow passage for fuel injection. So At the same time, the oxygen gas passes through the helical guide member inserted into the oxygen gas passage. This flow of oxygen gas is blown upward through the annular opening. Slag does not spread beyond the annular gas flow blown in from the mouth. wear it.

Disclosure of invention What is desired for a metal bottom-blowing tuyere with the above-mentioned structure is that it should be This is to prevent slag from getting on the parts.

Therefore, the blowing tuyere provided by the present invention has at least two concentric pipes. The central tube is the passage for oxygen, and the central tube and the outer tube are is a passage for supplying liquid or gas and fuel, and the above-mentioned blowing tuyere is connected to the above-mentioned passage. a helical guide member according to the invention in at least one of the channels; The guide member has a tubular shape and is provided in the fuel supply passage, and has a helical shape. The total cross-sectional area of the tubes constituting the internal material is 0.0% of the cross-sectional area of the oxygen supply passage. /～00 It is 5 times more.

Preferably, the helical guide member has a helix angle of 20 to 7!0.

A tuyere of such construction improves the aerodynamic properties of the gas jet and therefore and slag spillage, thus reducing metal losses and improving operating conditions. do better

Brief description of the drawing Figure 1 is a partial vertical cross-sectional view of the tuyere of the reservoir, which blows gas from the bottom of the metal, and Figure 2 is 1, and FIG. 3 is a cross-sectional view taken along line ■--■ in FIG. 1.

Best mode for carrying out the invention The blowing tuyere shown in the figure has two pipes /, J, the two pipes /, 2 having concentric circles. A passage is formed between the two tubes. The central tube 3 is a passage for oxygen. The space between the pipes and the pipes is for the fuel, other liquid or gas to be supplied. It is a passageway through which

A spiral guide member j is installed in the passage 4L (i/figure), and this guide member consists of a tube. The number of guide members is determined by the diameter of the pipe and the width of the passageway. .

In a preferred embodiment of the present invention, a wide guide member is used! is used.

The above guide member! The total cross-sectional area of the tubes constituting the tube is 0.00% of the cross-sectional area of the central passage 3. /no It is selected within a range of up to 095 times.

The helix angle α of the guide member j is selected within the range of 20 to 70.

The above parameters were determined empirically.

The flow rate of oxygen passing through the guide member j is determined by the cross-sectional area of the guide member j being the cross-sectional area of the passage 3. If the area is smaller than 0.1 times the area, how to prevent slag from forming near the tuyere. It is insufficient. The cross-sectional area of the guide member 5 is larger than 095 times the cross-sectional area of the passage 3. If the metal is excessively oxidized near the tuyere, the metal may be spilled. It will be the same as when The above guide member! If the torsion angle of is smaller than 200, the above The service life of the bottom of the converter is shortened. If the above twist angle is larger than 7j', the above acid The upward angle of the raw jet is too steep and therefore the slag cannot be removed.

The blowing tuyere according to the invention operates as follows.

Oxygen flows through the inner tube and gaseous fuel is supplied along the passage. Canada Depending on the length of heating time, either the gaseous fuel or oxygen is added to the spiral. It can be supplied along a shaped guide member. For example, the above converter can be converted into a solid-only converter. When operating as a charge, when charging scrap metal for heating or this While the scrap metal is being heated and melted, the gaseous fuel Guide parts! Supplied along. Before pouring out the hot water, use the above guide! supplies oxygen used for The above guide member! is installed in the above gas passage. The flow of oxygen through this gas passage removes the slag near the tuyere. melt and thus remove this melt scum. The helical guide member may be made of steel, for example. There is no problem even if it is made of pipe.

As is clear from the above explanation, the tuyere based on the present invention is close to the tuyere of the converter. The above metals can be blown into the metal without slag adhering to the dirty parts. As a result, the aerodynamic properties of Kamimachi Gas have improved, and the metal and slag from the converter have been improved. Dropping is prevented and metal loss is reduced. As a result, the metal yield improves. The service life of the tuyere is also extended.

Industrial applicability The present invention performs bottom blowing for the production of iron-based, manganese-based, or chromium-based alloys. Preferably, it is used in converters and open hearths.

Continuation of page 1 0 shots clear by Kolganov Gennady Sergeevich Soviet Union 300040) Ulla Uritsa Kalinina Day 26 Cor. Puss 2 Carve Works-307 0 shots clearer Ivasina Evgeny Nektarievich Soviet Union 300054) Ulla Uritsa Villiamsa De2co Lupus 2 Power-V-K-341 0 shots clearer Zavoronkov Yuri Ivanovich Soviet Union 162622 Cherepovet Prospekt Pobedoy Day 64 Power-vehicle 10 ■Person: Rudnev Yuri Andreevich Soviet Union 3000401-Ula Uritsa Michurina Day 130 Carve 2112 ■Person Zubarev Alexei Krigorievich Soviet Union 300008) - Ula Uritsa Belvomaiskaya Day 11/133 Carve Works-50 @Applicant Kolganov Gennady Sergeevich Soviet Union 300040) Ula Ulitsa Kalinina Day 26 Cor. Puss 2 Carve Works-307 ■Person Iwasina Evgeny Nektaryevich Soviet Union 300054) - Ulla Uritsa Villiamsa Day 2 Corpus 2 Power-Vu-341 ■Person: Zavoronkov Yuri Ivanovich Soviet Union 162622 Cherepovets Prospekt Pobedoy Day 64 Rikiichibu Tech 10

Claims (1)

[Claims] ノ, at least two concentrically arranged tubes (/. ), a central passage (3) for the supply of oxygen, and an upper passage for the supply of liquid or gas and fuel. A passage (≠') provided between the marked pipes (1, ko) and at least one of the above passages. In a blowing tuyere having a helical guide member (J) arranged in the passage; The spiral guide member (j) is formed from a pipe, and this pipe is connected to the fuel supply passage (Hiro). The total cross-sectional area of all the tubes constituting the guide member (j) is 0.0 of the cross-sectional area of the supply passageway (3). / to O,S times the range Tuyere for blowing. E. The helix angle of the helical guide member (j) is selected within the range of 20 to 73". The blowing tuyere according to claim 1, wherein the blowing tuyere is