JP2017088925A - Lance pipe for blowing oxygen gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a lance pipe for blowing an oxygen gas, which can be surely ignited and can perform an oxygen spraying operation in a short time.SOLUTION: In a lance pipe for blowing an oxygen gas in which an oxygen gas supplied through an internal passage is ejected from an apex of a lance body 1, an oxidation reaction of iron and oxygen is induced on an apex side of the lance body, and an object to be melted/cut is melted/cut by its reaction heat, the lance body 1 is provided with an ignition jig 2 at its apex, and the ignition jig 2 has an insertion part located on the internal passage, includes a core material 2a that forms a U-character shape that goes around its external surface via an apex of the lance body 1 and the core material 2a over an entire length, and is formed of a jacket material 2b fastened and held via a fastening means 3 to an apex part of the lance body 1 together with the core material 2a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oxygen gas blowing lance pipe suitable for use in a blast furnace tapping operation, particularly a tapping port tapping operation.

  The drilling operation of the blast furnace, particularly the drilling operation that penetrates the taphole blocked by the mud material (unshaped refractory), is usually performed using a drill rod. If it becomes difficult to continue the work due to the insertion of metal or slag during drilling, insert an iron pipe for blowing oxygen gas into the hole drilled by the drill rod. Then, iron is combusted by blowing oxygen gas through it (iron-oxygen oxidation reaction), and the drilling operation is continued by the reaction heat (hereinafter referred to as oxygen application operation).

  Specifically, the oxygen application work involves preparing a high-temperature heat source (hot metal, etc.) in advance, igniting the iron pipe (lance pipe) using this heat source, and then inserting it into the perforated part. However, in the process of inserting the iron pipe, misfires frequently occur, so re-ignition work is necessary, and this has caused a delay in tapping.

  It should be noted that the delay in ironing out is directly linked to major troubles such as hot metal / slag level increase, furnace gas air permeability impediment, furnace condition deterioration, furnace gas blowout, etc. For this reason, it has problems that lead to wind reduction and production reduction.

  As a prior art in this regard, oxygen is supplied from the base end into the metal pipe as appropriate, and the tip of the metal pipe is combusted as appropriate, and the work to be cut is appropriately melted by the oxidation reaction heat or oxidation reduction heat. For the lance pipe to be shaved, an appropriate metal combustion consumable base tube is formed on the outer surface or inner / outer surface thereof, and an appropriate metal combustion consumable filler is formed on the flange portion of the combustion consumable base tube. For example, a lance pipe disclosed in Patent Document 1 is known.

Japanese Patent Laid-Open No. 11-118118

  The lance pipe disclosed in the above-mentioned prior art document 1 can increase the drilling amount of the work to be cut per unit time until the portion where the amount of filling of the combustion consumable filler is increased is consumed. Although it has been said that there is an advantage that the work of drilling deeply into the work piece can be completed in a relatively short time, it takes some time to ignite and burn the tip part. There is still room for improvement in terms of starting the cutting of the workpiece quickly.

  An object of the present invention is to propose an lance pipe for injecting oxygen gas capable of realizing quick and reliable ignition and realizing an efficient oxygen application work.

In the present invention, oxygen gas fed through an internal passage is ejected from the tip of the lance body to cause an iron-oxygen oxidation reaction at the tip of the lance body, and the work to be melted is melted by the reaction heat. An oxygen gas blowing lance pipe for cutting,
The lance body includes an ignition jig at its tip,
The ignition jig has an insertion portion located in the internal passage, and includes a U-shaped core member that wraps around the outer surface of the lance main body through the distal end of the lance body, and includes the core member over its entire length. In addition, an oxygen gas blowing lance pipe is formed of an exterior material that is fixedly held to a tip portion of the lance main body together with the core member via a fastening means.

In addition, the present invention allows oxygen gas supplied through the internal passage to be ejected from the tip of the lance body to form a combustion region on the tip side of the lance body, and to cut the work to be cut by the reaction heat. A lance pipe for blowing oxygen gas,
The lance body includes an ignition jig at its tip,
The ignition jig is detachably connectable to the tip of the lance body, and has a socket that forms an oxygen gas outlet at the open end thereof, and an insertion portion that is located inside the socket, A U-shaped core material that wraps around the outer surface of the socket through the open end of the socket, includes the core material over its entire length, and is fixedly held to the socket together with the core material via fastening means. An lance pipe for injecting oxygen gas, characterized by comprising an exterior material.

  In the oxygen gas blowing lance pipe having the above structure, the lance body preferably has a jet lance at its tip. As the jet lance, an inner tube that forms an internal passage for supplying oxygen gas inside, an outer tube that houses the inner tube inside and forms an annular space between the inner tube, What consists of metal fillers filled in this annular space can be applied.

  In addition, as the above-mentioned core material, iron wire (soft steel wire (annealing wire etc.), ordinary iron wire etc.), tin plate, iron powder, metal (Cr, Mn, Si, Ti, Al, Mg, which is easier to oxidize than iron) , Ca, etc.) is preferably applied, and as the exterior material, synthetic rubber is preferably applied.

  According to the present invention, the ignition jig has a U-shaped core member that has an insertion portion located in the internal passage of the lance body, and wraps around the outer surface of the lance body through the tip, and A core material is included over the entire length of the lance body, and the core material is composed of an exterior material that is fixedly held to the distal end portion of the lance body via a fastening means, and this is attached to the distal end portion of the lance body. Therefore, just by inserting it into the drilled part formed by the drill rod, the ignition jig burns in stages from the exterior material to the core material, and the lance pipe is reliably ignited using this as a fire type (drill rod The temperature of the bottom of the hole drilled by is about 1100 ° C, and the ignition jig burns just by inserting the lance pipe into the hole), avoiding delays in output that lead to wind reduction and production reduction Is done.

  According to the present invention, the ignition jig can be detachably connected to the tip of the lance main body, and the socket that forms the oxygen gas ejection port at the open end thereof, and the insertion portion positioned inside the socket are provided. A core material having a U-shape that wraps around the outer surface of the socket through the open end of the socket, encloses the core material over its entire length, and together with the core material, via a fastening means By using the exterior material that is fixed and held, a conventionally used lance pipe can be used as it is. Even if the lance pipe is once used in the previous oxygen application work, it can be reused if it is long.

  By providing a jet lance at the tip of the lance body, it is possible to generate heat close to 4000 ° C., and efficient oxygen application can be performed.

  For example, the ignition jig is composed of a structural carbon steel similar to the lance pipe, the core is composed of a metal wire such as an annealed iron wire, and the exterior material is composed of a synthetic rubber. Due to the structure in which members with low activation energy are arranged from the outside to the inside, the lance pipe for injecting oxygen gas can be ignited under the reliable combustion of the ignition jig, and the output delay due to poor ignition Can be avoided.

It is the figure which showed typically embodiment of the lance pipe for oxygen gas blowing according to this invention. It is the figure which showed the condition of oxygen application work. It is the figure which showed typically other embodiment of the lance pipe for oxygen gas blowing according to this invention. It is the figure which showed typically other embodiment of the lance pipe for oxygen gas blowing according to this invention.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram schematically showing an embodiment of an oxygen gas blowing lance pipe according to the present invention.

  Reference numeral 1 in the figure denotes a lance main body (length is about 5 to 15 m) that forms an oxygen gas blowing lance pipe, for example, a cylindrical shape made of structural carbon steel (STKM). The lance main body 1 ejects oxygen gas as a combustion support material fed through its internal passage from its tip.

  Reference numeral 2 denotes an ignition jig provided at the tip of the lance body 1. This ignition jig 2 has an insertion part (2a ') located in the internal passage of the lance body 1, and a U-shaped core material (around the outer surface through the tip of the lance body 1) ( Annealed iron wire, etc. (Annealed iron wire is an ordinary iron wire annealed for softening) 2a and the core material 2a are enclosed over the entire length and fastened to the tip of the lance body 1 together with the core material 2a. It is comprised from the exterior material (synthetic rubber etc. whose ignition point is about 350 degreeC) 2b fixedly hold | maintained via the means (number line etc.) 3. The core material 2a can use one or more.

  FIG. 2 is a view showing a state in which an oxygen gas blowing lance pipe is inserted into a hole portion drilled by a drill rod to perform an oxygen application work and a work piece such as a mud material is being cut.

  The lance pipe for injecting oxygen gas according to the present invention has its internal heat (energy for ignition (heat source) when inserted into a hole portion (length is about 3200 to 3500 mm) drilled by a drill rod. First, the exterior material 2b burns from the outer surface of the lance body 1 toward the internal passage, and the core material 2a also burns from the outer surface of the lance body 1 toward the insertion portion. As a result, the oxygen gas blowing lance pipe is surely ignited.

  FIG. 3 shows a lance pipe for injecting oxygen gas according to the present invention provided with an ignition jig 2 similar to that shown in FIG. 1 and provided with a socket 4 that can be detachably connected to the tip of the lance body 1. It is the figure which showed other embodiment.

  In the oxygen gas blowing lance pipe having such a configuration, the ignition jig 2 can be easily attached and detached, and a lance pipe used conventionally can be used, and the lance pipe used in the previous oxygen application work. Can be reused.

  FIG. 4 is a view showing still another embodiment of the lance pipe for injecting oxygen gas according to the present invention in which the jet lance 5 is provided at the tip of the lance body 1.

  The jet lance 5 includes an inner tube 5a that forms an internal passage for supplying oxygen gas inside, an outer tube 5b that houses the inner tube 5a and forms an annular space therebetween, and the annular One or a plurality of metallic fillers (element wires made of soft iron or the like) 5c filled in the space.

  The oxygen gas blowing lance pipe having such a configuration can not only reliably ignite the oxygen gas blowing lance pipe, but also the jet lance 5 can generate a heat of nearly 4000 ° C. at the front end side of the oxygen gas blowing lance pipe. And, it has an advantage that the tap hole can be penetrated in a short time by efficient cutting of the work to be cut such as mud material.

  In particular, in the lance pipe for blowing oxygen gas to which the socket 4 is applied, a gap of about 10 mm (symbol t in FIG. 3) is provided between the front end of the lance body 1 and the rear end surface of the ignition jig 2. It is preferable to keep it, and this can reduce thermal damage to the lance body 1.

  As the core material 2a, normal iron wire, tin plate, iron powder, metal that is more easily oxidized than iron (Cr, Mn, Si, Ti, Al, Mg, Ca), etc. can be applied, but there are few internal defects and heat conduction. It is particularly preferable to use “annealed iron wire” as an easily ignitable material having good properties.

  As the exterior material 2b, synthetic rubber coated with the core material 2a or a material that oxidizes more easily than the metal forming the core material 2a, such as a mud material or a hot metal temperature measuring jig, can be applied. In the case where synthetic rubber is used, a hollow cylindrical member such as a rubber hose provided with a through hole that allows the core material 2a to be inserted may be applied.

  In connecting the socket 4 to the lance body 1, a fastening means such as a screw or a bayonet, or a protrusion provided on the inner surface of the socket 4 is engaged with a protrusion provided on the outer surface of the tip of the lance body 1. It is possible to apply engagement means such as so-called undercut, and this point is not particularly limited.

  Ignition jig (core material: diameter 3mm, length 130mm SURM (soft steel wire) (smoothed wire type No. 12), exterior material: outer diameter 14mm, length 130mm synthetic rubber (Bridgestone Excel color hose type 7 × 2BK) 1) an oxygen gas blowing lance pipe (outer diameter 17.3 mm, length 5000 mm STKM (structural carbon steel)) and an ignition jig (core material: diameter 3 mm, 130 mm long SURM (soft steel wire) (annealed wire type 12), exterior material: outer diameter 14 mm, 130 mm long synthetic rubber (Bridgestone Excel Color Hose type 7 × 2BK), socket: inner diameter 20 mm, length 80 mm 3 (STKM (structural carbon steel)) and an oxygen gas blowing lance pipe (outer diameter: 17.3 mm, having the structure shown in FIG. 3 above) Using an STKM (structural carbon steel) with a length of 5000 mm, perform the oxygen application work under the following conditions, and investigate the ignition status, ignition rate, operation time (ignition to penetration), and misfire rate during the operation. The result is the result of igniting the lance pipe for oxygen gas injection using an electric wiring or rubber hose as the ignition material when the oxygen gas injection lance pipe is ignited using hot metal as the ignition type. The results are shown in Table 1.

  The results in Table 1 are the average of the number of trials taken as 10 times, and the ignition rate means the rate at which the lance pipe was ignited. Time to penetrate (open hole (about 5 min) ⇒ horizontal hole generation ⇒ lance pipe ignition ⇒ oxygen application work ⇒ exchange from one-shot rod (rod for opening) to a metal rod (rod for excavating the remaining mud after horizontal hole generation) (About 5 min) ⇒Penetration work (about 5 min) by driving a metal rod.

Conditions for oxygen application:
1. If the single rod (opening rod) cannot penetrate (the hot metal or slot penetrates and the tip of the single rod melts, or the hot rod or slot becomes solid due to the mist in the hole and wears the tip of the single rod Etc., when drilling becomes impossible.
2. The rod has penetrated with a single shot, but the tip of the rod has come off and has melted and remained behind the hole.

  As is clear from Table 1, in the oxygen charging operation (NO. 4 to 6) using the oxygen gas blowing lance pipe according to the present invention, the lance pipe is well ignited and the misfire rate during the operation is zero. It was confirmed that the oxygen application work was completed in a relatively short time. In addition, when each of the annealed iron wire and the ordinary iron wire used as the core material was heated with a gas torch (1650 ° C.), the ordinary iron wire was red-hot in 30 seconds, and the annealed iron wire was red-hot in 10 seconds. It was also confirmed that the annealed iron wire had better thermal conductivity.

  Test No. 1, test no. As a result of comparing the output delay time and production reduction when oxygen was applied to No. 5, test no. In No. 1, the output delay time was about 30 minutes and the production reduction was 248 t / month. In 5, the output delay time was about 15 min, and the production reduction was 100 t / month.

  ADVANTAGE OF THE INVENTION According to this invention, the lance pipe for oxygen gas blowing which can perform ignition of oxygen efficiently by ensuring ignition of the lance pipe for oxygen gas blowing can be provided.

DESCRIPTION OF SYMBOLS 1 Lance main body 2 Ignition jig 2a Core material 2b Exterior material 3 Fastening means 4 Socket 5 Jet lance 5a Inner pipe 5b Outer pipe

Claims (4)

Oxygen gas delivered through the internal passage is ejected from the tip of the lance body, causing an oxidation reaction of iron-oxygen at the tip of the lance body, and the heat of reaction to cut the work to be cut A lance pipe for blowing,
The lance body includes an ignition jig at its tip,
The ignition jig has an insertion portion located in the internal passage, and includes a U-shaped core member that wraps around the outer surface of the lance main body through the distal end of the lance body, and includes the core member over its entire length. And an lance pipe for injecting oxygen gas, characterized in that the lance pipe is made of an exterior material fixed and held together with the core member to the tip of the lance body via fastening means. An oxygen gas blowing lance that blows out oxygen gas fed through the internal passage from the tip of the lance body to form a combustion region on the tip side of the lance body and also to cut the workpiece by reaction heat A pipe,
The lance body includes an ignition jig at its tip,
The ignition jig is detachably connectable to the tip of the lance body, and has a socket that forms an oxygen gas outlet at the open end thereof, and an insertion portion that is located inside the socket, A U-shaped core material that wraps around the outer surface of the socket through the open end of the socket, includes the core material over its entire length, and is fixedly held to the socket together with the core material via fastening means. A lance pipe for injecting oxygen gas, characterized by comprising an exterior material. The lance body has a jet lance at its tip,
The jet lance includes an inner pipe that forms an internal passage for supplying oxygen gas inside, an outer pipe that houses the inner pipe inside and forms an annular space between the inner pipe, The lance pipe for injecting oxygen gas according to claim 1 or 2, comprising a metal filler filled in the annular space.   The oxygen gas blowing lance pipe according to any one of claims 1 to 3, wherein the core material is an annealed iron wire, and the exterior material is a synthetic rubber.

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