DE8230655U1 - HIGH TEMPERATURE BLOWING AND RINSING - Google Patents

Description

High temperature blowing and flushing lance

The innovation concerns a high-temperature blowing and flushing lance for dephosphorization and desulfurization of steel melts, consisting of several coaxial tubular composite layers with a support tube made of steel tube, an in the steel pipe held porcelain pipe and a tubular layer of refractory material provided outside the steel pipe Material.

With the help of high-temperature blowing and flushing lances, agents are blown into molten steel - these are flushed - in order to perform dephosphorization and / or desulfurization, e.g. those based on lime and / or calcium carbide, oxygen and / or argon.

Known lances of the aforementioned type have an outside diameter of approx. 250 mm and a length of 4 m, a weight of approx. 38O kg. You can consequently only with help special manipulators are introduced into the steel melt. When introduced into the steel melt are subject to the lances of a high mechanical load: because of their The lances experience a large surface area and their low specific weight compared to molten steel Molten steel a strong boost; the lance held in the manipulator, primarily the porcelain tube, breaks. In addition, the burn-up of the known lances is so great that a length of time is consumed for iodine blowing.

3 -

The innovation aims to remedy this. The innovation lies

the task is based on a lance of the type mentioned above

to be trained in such a way that they are smaller in diameter and

Weight is not subject to mechanical destruction and only

burns so little that several with the same lance

Rinsing processes can be carried out, so the lance I

can be used multiple times. According to the innovation, this jj

The object is achieved in that a glass fiber ·

# "* Wrapped fabric mat and another fiberglass fabric mat j

is counter-wound, onto the counter-wound fiberglass mat j

a tubular layer of refractory ceramic protective compound }

applied and an aluminum protective film I around the protective mass

is wrapped. |

The lance according to the innovation has an outside diameter of | approx. 80 mm; their weight is 4 m long

approx. 25 kg. Tests have shown that the J.

Innovation at least four flushing processes are carried out |

can. The low weight of the lance allows its length jl

to be extended to approx. 6 m, whereby the lance on the one hand |

remains handy, on the other hand, the number of rinsing processes continues |

is increased. Due to their much smaller surface |

the buoyancy is less; mechanical destruction, especially |

special of the porcelain tube, was not determined. Because of | -

because of its comparatively low weight, the lance can be | to be served.

An embodiment of the innovation is shown in the drawing and is described in more detail below. Show it:

Fig. 1 is an axial section through a high temperature blow and flushing lance, wherein
the length roughly on a scale of 1:20, the

Diameter approximately on a scale of 1: 5,

is shown smaller; I.

.ί.

II I

Fig. 2 shows a detail from Fig. I with im

Scale 1: 1 shown diameter;

3 shows the end view of the section of the lance shown in FIG. 2.

The selected as an embodiment high-temperature blowing and The flushing lance has a steel tube 1 as the carrier tube. The steel pipe 1 is a pipe according to DIN 2440 an inside diameter of 1 1/4. For the management of the agents and gases to be introduced into the steel melt for desulphurization and a porcelain pipe 2 is let into the steel pipe 1 for dephosphorization. The preferred porcelain tube used 2 is commercially available under the name "Silimantin 65". Outside, the steel tube 1 is initially made of two glass = fiber fabric mats 3, 4 Surrounded. The fiberglass fabric mats 3, 4 are wrapped as bandages in two layers: The fiberglass fabric mat 3 is wound in one direction; the fiberglass fabric mat 4 in the opposite direction. On the outer Glass fiber fabric mat 4 is a tubular layer 5, a refractory ceramic protective compound. This refractory

Ceramic protective compound is temperature-resistant up to approx. 1780 C.

The tubular layer 5 provides thermal protection to the outside; through the fiberglass fabric mats 3, 4 holds the tubular Layer securely on the steel pipe 3. Around the tubular layer An aluminum protective film 6 is wound from a fireproof ceramic protective mass. The protective film 6 serves as moisture protection .

A steel pipe 7 is attached to one end of the high-temperature blowing and flushing lance. The steel pipe 7 acts it is a pipe according to DIN 2440 with an inside diameter of 1. The steel tube 7 serves as a holding tube and is in a Lance head used. To accommodate it, in the exemplary embodiment, the steel tube 1 serving as a support tube is a

it *

Collar lO formed / which receives the steel pipe '7. There where Tube or tubular parts of the lance after the innovation must be glued together, this is done by a commercially available under the name "Circön-Oxyd-Kleber" Glue.

Claims (1)

ι · DlPL-ING. LOTHAR DÖRNER Patent attorney October 29, 1982 5B hagen. sTRESEMANNSTRAssE 15 lawyer file 82093 / W TELEPHONE (02331) 28302 m-ima-i. ι_αα.τ> .ι- - uä ^^ - j / »< Utility model registration
Applicant: Knieps & Pöckler Claim to protection High temperature blowing and flushing lance 2 for dephosphorization and Desulfurization of molten steel, consisting of several coaxial pipe-like composite layers with one made of steel pipe formed support tube, one held in the steel tube porcelain tube and one outside of the steel tube provided tubular layer of refractory material, characterized in that around the steel tube (1) Fiberglass fabric mat (3) wrapped and another fiberglass fabric mat (4) is counter-wound, on the counter-wound glass fiber mat (4) a tubular layer Refractory ceramic protective mass (5) is applied and an aluminum protective film (6) is wrapped around the protective mass.