CN216107060U

CN216107060U - Single-tube double-hole dip pipe with double circular flow argon pipes

Info

Publication number: CN216107060U
Application number: CN202121847499.1U
Authority: CN
Inventors: 王胜; 徐海强; 窦为学; 常立山; 智新龙; 王胜召
Original assignee: Hebei Jingye High Grade Steel Technology Co ltd
Current assignee: Hebei Jingye High Grade Steel Technology Co ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-03-22
Anticipated expiration: 2031-08-09

Abstract

The utility model relates to a single-tube double-hole dip pipe with double circular flow argon pipes, belonging to the technical field of molten steel furnace external vacuum refining in the metallurgical industry. The technical scheme is as follows: the interior of the single-tube double-hole dipping pipe is divided into two arc-shaped areas by a middle partition wall (3) and used as channels for molten steel to flow up and down, the lower half part of the interior of each channel is provided with a plurality of argon small pipes, one of the channels is used as an ascending pipe (1), and an air outlet of the argon small pipe at the lower half part of the ascending pipe (1) is exposed outside; the other passage is used as a down pipe (2), and an argon small pipe gas outlet at the lower half part of the down pipe (2) is pre-embedded in the refractory material. The utility model has the beneficial effects that: the space utilization rate can be effectively improved, and the flow area of the molten steel is increased, so that the circulating flow of the molten steel is improved; compared with the prior dip pipe, the dip pipe has the advantages that the number of the used furnaces can reach more than 80, the utilization rate of refractory materials is effectively improved, and the cost per ton of steel is reduced.

Description

Single-tube double-hole dip pipe with double circular flow argon pipes

Technical Field

The utility model relates to a single-tube double-hole dip pipe with double circular flow argon pipes, belonging to the technical field of molten steel furnace external vacuum refining in the metallurgical industry.

Background

Since the Ruhrstahl company (Ruhrstahl) and Heraeeus company (Hereaeus) in 1959 jointly design and develop an RH vacuum refining method, many technicians develop a great deal of research and tests in order to improve the refining effect and production efficiency of RH and increase the metallurgical function of RH, make a plurality of improvements and innovations on the equipment structure and operation of an RH refining furnace, successively develop various multifunctional external vacuum refining equipment such as RH-OB, RH-PB, RH-KTB, RH-PTB and the like, and play an extremely important role in improving the quality of steel and expanding the variety of steel. At present, an RH-KTB vacuum degassing device becomes a representative device of secondary refining, can realize various metallurgical functions of molten steel decarburization and degassing, alloy element addition, temperature compensation, inclusion removal and the like in a vacuum environment, and is an essential component part for industrially producing clean steel represented by ultra-low carbon steel.

In order to improve the circulation flow of the RH vacuum furnace, a plurality of metallurgical experts carry out a great deal of innovative design on the dip pipe structure, and besides the conventional double-circular dip pipe structure, the dip pipe structure also has various types such as a single-nozzle dip pipe structure, a double-oval dip pipe structure, a multi-dip pipe structure and the like. Chinese patent CN 103834766 a proposes a dip pipe for RH vacuum refining device, which is divided into an arc-shaped ascending pipe and a descending pipe by an intermediate partition wall, wherein a circulation argon pipe is arranged in the ascending pipe, and lifting argon is blown in. The arch-shaped dip pipe cancels the clearance between the ascending pipe and the descending pipe of the conventional double-circular dip pipe, which is generated by refractory materials, increases the flow area of molten steel and obviously increases the circulating flow. However, in practical production, the circulating argon gas pipe of the riser continuously blows lifting argon gas into molten steel to drive the molten steel to flow upwards, the high-speed movement of the argon gas and the molten steel is easy to wash and erode refractory materials in the riser, and in contrast, the erosion degree of the downcomer is far smaller than that of the riser. However, the arched dip pipe is an integral body, the ascending pipe and the descending pipe share the intermediate partition wall, and the descending pipe is scrapped when the dip pipe is dropped off the pipeline because of damage of the refractory material of the ascending pipe. In fact, the refractory material inside the downcomer can continue to be used without reaching the scrap standard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a single-tube double-hole dip pipe with a double-loop argon pipe arrangement, which can effectively improve the space utilization rate and increase the flow area of molten steel, thereby improving the circulating flow of the molten steel and solving the problems in the background art.

The technical scheme of the utility model is as follows:

a single-tube double-hole dip pipe with double circulation argon pipes is characterized in that the interior of the single-tube double-hole dip pipe is divided into two arc-shaped areas by a middle partition wall and used as channels for molten steel to flow up and down, a plurality of argon small pipes are arranged at the lower half part of the interior of each channel and used for providing circulation gas, one channel is used as an ascending pipe, and an air outlet of the argon pipe is exposed outside; the other channel is used as a downcomer, the air outlet of an argon pipe of the downcomer is embedded in a refractory material, after a certain number of furnaces are used, refractory bricks on the inner wall of the downcomer are eroded to a certain thickness, the air outlet of an argon pipe is contacted with molten steel, then the circulating argon of the downcomer is opened, the circulating argon of the riser is closed, the original downcomer becomes a new riser, the original riser becomes a new downcomer, and the service life of the dip pipe can be further prolonged.

The integral structure of the single-pipe double-hole dip pipe is a cylinder with a partition wall in the middle, and the interior of the single-pipe double-hole dip pipe is divided into two arc-shaped areas which are used as channels for the molten steel to flow up and down; the middle partition wall is sequentially provided with refractory bricks, castable and a steel structure from two sides to the inside; the cylinder is sequentially provided with a casting material, a steel structure, a casting material and refractory bricks from outside to inside.

In the building process of the single-tube double-hole dip pipe, a plurality of circulation argon gas pipes are arranged at the lower parts of the inner walls of the two channels, small pipes of the circulation argon gas pipes are embedded into the casting material, gas outlets of the circulation argon gas pipes are divided into an upper layer and a lower layer which are arranged in a staggered mode, and each layer is provided with 3-7 gas outlets.

A channel of the single-tube double-hole dip pipe, the outlet of which is exposed outside the circulation argon pipe, is used as an ascending pipe, the other channel is used as a descending pipe, the outlet of the circulation argon pipe is blocked by an aluminum rivet and is hidden in a refractory brick, and the distance between the outlet and the inner wall of the channel is about 50 mm.

After a single-tube double-hole dip pipe is arranged on an RH vacuum tank, a small argon pipe of a riser is normally ventilated, and the flow of argon is controlled to be 10-30 NL/min per ton of steel in the molten steel refining process; an argon small pipe of the downcomer is communicated with argon, the gas pressure of the downcomer is kept at 2-5 Pa, and the argon cannot flow due to the blockage of a gas outlet; after about 50-furnace molten steel is treated, the outlet of the argon small pipe in the downcomer is contacted with the molten steel, the aluminum rivet is rapidly melted, argon is blown into the molten steel, then the gas flow of the argon is adjusted to 10-30 NL/min per ton of steel, and the argon circulating in the argon pipe in the riser is closed, so that the original downcomer becomes a new riser, the original riser can be continuously used as a new downcomer, and the service life of the dip pipe is prolonged.

The utility model has the beneficial effects that: can effectively improve the space utilization rate and increase the flow area of the molten steel, thereby improving the circulation flow of the molten steel. Meanwhile, in view of the problem that the erosion degree of the refractory bricks in the ascending pipe is far greater than that of the descending pipe in the single-pipe double-hole dip pipe, the dip pipe adopts a mode of arranging two sets of circulation argon pipes, argon small pipes are arranged in the ascending pipe and the descending pipe, and an air outlet of the argon small pipe of the descending pipe is buried in the refractory bricks. When the number of the used furnace of the dip pipe reaches about 50 furnaces, the corrosion degree of the refractory bricks of the ascending pipe is serious, the gas outlet of the argon tubule of the descending pipe just contacts with the molten steel, the argon of the ascending pipe is immediately closed, the argon begins to be introduced into the descending pipe, and the functions of the two pipes are exchanged. Thus, the refractory bricks in the downcomer can be continuously utilized, and the service life of the dip pipe is prolonged. Compared with the prior dip pipe, the dip pipe has the advantages that the number of the used furnaces can reach more than 80, the number of the used furnaces is increased by about 20, the design requires low cost, the utilization rate of refractory materials can be effectively improved, and the cost of steel per ton is reduced.

Drawings

FIG. 1 is a cross-sectional view of the present invention in a vertical direction;

FIG. 2 is a cross-sectional view of the present invention in the horizontal direction;

in the figure: the device comprises an ascending pipe 1, a descending pipe 2, an intermediate partition wall 3, an outer layer casting material 4, a dip pipe steel structure 5, an inner layer casting material 6, a dip pipe refractory brick 7, a partition wall refractory brick 8, a partition wall casting material 9, a partition wall steel structure 10, an ascending pipe circular flow argon pipe 11, an ascending pipe circular flow argon pipe outlet 12, a descending pipe circular flow argon pipe 13 and a descending pipe circular flow argon pipe outlet 14.

Detailed Description

The utility model is further illustrated by way of example in the following with reference to the accompanying drawings.

Referring to the attached drawings 1-2, the interior of a single-tube double-hole dip pipe arranged in a double-loop argon pipe is divided into two arc-shaped areas by a middle partition wall and used as channels for molten steel to flow up and down, a plurality of argon small pipes are arranged at the lower half part of the interior of each channel and used for providing circulating gas, one channel is used as an ascending pipe, and the air outlet of the argon pipe is exposed outside; the other passage is used as a down pipe, and an air outlet of an argon pipe of the down pipe is embedded in the refractory material.

In this embodiment, referring to fig. 1-2, the single-tube double-hole dip pipe has a straight-tube type overall structure, the circular dip pipe is internally divided into an arc-shaped ascending pipe 1 and a descending pipe 2 by an intermediate partition wall 3, the ascending pipe 1 is composed of an arc-shaped inner wall and an intermediate partition wall 3, the descending pipe 2 is composed of an arc-shaped inner wall and an intermediate partition wall 3 on the other side, the arc-shaped inner wall is composed of an outer-layer castable 4, a dip pipe steel structure 5, an inner-layer castable 6 and a dip pipe refractory brick 7 in sequence from outside to inside, and the intermediate partition wall 3 is composed of a partition-wall refractory brick 8, a castable 9 and a partition-wall steel structure 10 in sequence from both sides to inside. In the laying process of the dip pipe, two sets of circulating argon gas pipes are respectively arranged inside an ascending pipe 1 and a descending pipe 2, the gas inlets of small argon gas pipes are arranged outside, penetrate through a dip pipe steel structure 5 and are embedded in an inner layer casting material 6, then the circulating argon gas pipe 11 of the ascending pipe directly penetrates through a lower dip pipe refractory brick 7, the gas outlet 12 of the circulating argon gas pipe is exposed outside, but the circulating argon gas pipe 13 of the descending pipe does not directly penetrate through the lower dip pipe refractory brick 7, the gas outlet 14 of the circulating argon gas pipe of the descending pipe is blocked by aluminum rivets and is embedded in the dip pipe refractory brick, and the gas outlet 14 of the circulating argon gas pipe of the descending pipe is about 50mm away from the inner wall surface of the descending pipe 2. Except whether the air outlets are exposed or not, the arrangement modes of the two sets of circulation argon pipes are kept consistent, the air outlets 12 of the ascending pipe circulation argon pipes are arranged in two layers, the air outlets of the upper layer and the lower layer are staggered, the number of each layer is 3-7, generally, the lower layer is more than that of the upper layer, and the air outlets 14 of the descending pipe circulation argon pipes are also distributed in the same way.

In this example, the single tube, double hole dip tube has three layers of refractory bricks in total, the thickness being 145 mm; the two sets of circulation argon gas pipes are 11 argon gas small pipes, and the gas outlets of the two sets of circulation argon gas pipes are positioned at the lower part of the inner wall and are arranged in a staggered mode in two layers, namely 4 in the upper layer and 7 in the lower layer. The outlet of the small argon pipe of the ascending pipe is exposed outside; the outlet of the argon pipe of the downcomer is blocked by an aluminum rivet and is buried in the refractory brick, and the distance between the outlet and the inner wall surface is 50 mm. In the molten steel refining process, the ascending pipe provides circulating argon, the gas flow is controlled to be 10-30 NL/min per ton of steel, and the molten steel flows upwards into the vacuum tank; argon is introduced into a circular argon pipe of the downcomer, the gas outlet is blocked, the gas has no flow, the gas pressure is kept about 4 Pa, and the molten steel flows back into the steel ladle from the point. When the number of the used furnaces reaches about 50, the refractory bricks on the inner wall of the ascending pipe are seriously eroded, particularly at the position of an air outlet; and the corrosion degree of refractory bricks at each part of the inner wall of the downcomer is smaller and basically consistent, meanwhile, the gas outlet is contacted with molten steel, the aluminum rivets are quickly melted, the circulating argon is blown into the molten steel, the gas starts to flow, the argon flow of the downcomer is adjusted to 10-30 NL/min per ton of steel according to the situation, and the argon circulating flow of the riser is closed. Thus, the down pipe becomes a new up pipe, the original up pipe becomes a new down pipe, the functions of the two are exchanged, and the dip pipe can be continuously used for about 30 furnaces. The number of the used furnace of the dip pipe can reach more than 80, compared with the prior dip pipe, the service life of the dip pipe is prolonged by about 20 furnaces, the design requires low cost, the utilization rate of refractory materials can be effectively improved, and the cost of steel per ton can be reduced.

Claims

1. The utility model provides a single tube diplopore dip pipe that double-loop argon gas pipe arranged which characterized in that: the interior of the single-tube double-hole dipping pipe is divided into two arc-shaped areas by a middle partition wall (3) and used as channels for molten steel to flow up and down, the lower half part of the interior of each channel is provided with a plurality of argon small pipes, one of the channels is used as an ascending pipe (1), and an air outlet of the argon small pipe at the lower half part of the ascending pipe (1) is exposed outside; the other passage is used as a down pipe (2), and an argon small pipe gas outlet at the lower half part of the down pipe (2) is pre-embedded in the refractory material.

2. The single-tube double-hole dip tube of double-loop argon tube arrangement as claimed in claim 1, wherein: the single-pipe double-hole dip pipe is cylindrical and sequentially composed of an outer-layer casting material (4), a dip pipe steel structure (5), an inner-layer casting material (6) and dip pipe refractory bricks (7) from outside to inside, and a middle partition wall (3) is sequentially composed of partition wall refractory bricks (8), partition wall casting materials (9) and partition wall steel structures (10) from two sides to inside.

3. The single-tube double-hole dip tube of double-loop argon tube arrangement as claimed in claim 2, wherein: an argon small pipe gas outlet at the lower half part of the downcomer (2) is pre-buried in the dip pipe refractory brick (7).

4. The single-tube double-hole dip tube of double loop argon tube arrangement according to claim 1 or 2, characterized in that: the air outlets of the argon small pipes at the lower half parts of the ascending pipe (1) and the descending pipe (2) are divided into an upper layer and a lower layer which are arranged in a staggered mode, and each layer is provided with 3-7 air outlets.

5. The single-tube double-hole dip tube of double-loop argon tube arrangement as claimed in claim 1, wherein: the lower half part of the ascending pipe (1) is connected with an ascending pipe circulation argon pipe (11), and the lower half part of the descending pipe (2) is connected with a descending pipe circulation argon pipe (13).