CN211497693U - RH dipping device with cooling efficiency - Google Patents

Abstract

An RH dipping device with cooling effect mainly comprises a first dipping pipe, a second dipping pipe, a first neck, a second neck, an anchoring piece and a casting material layer, wherein neck sleeves are respectively sleeved on the first neck and the second neck, and cooling air channels are respectively formed between the first neck and the second neck and the neck sleeves; the neck sleeve is provided with an air inlet and an air outlet, a cooling air channel between the air inlet and the air outlet is connected with a closed baffle, and the height and the width of the closed baffle are the same as those of the cooling air channel; the air inlet is connected with an air pipe, and the air pipe is connected with a cooling air source; the exhaust port is connected with an exhaust pipe; and respectively moving the anchoring parts and the pouring material layer on the first neck part and the second neck part to the neck sleeve. The utility model discloses life cycle can be improved to on average 140 by original on average 110 times, can reduce the molten steel and change at least 0.5% of rate of judgement, and simple structure, with low costs, security height, can not produce the crack or wear the hourglass problem.

Description

RH dipping device with cooling efficiency

Technical Field

The utility model relates to a steelmaking vacuum treatment device, in particular to an RH dipping device.

Background

In recent years, with the increasing national demand for high-cleanliness high-end-performance varieties of steel, the yield ratio of high-technology content and high-added-value products in three separate plants of a steel plant with limited martial steel reaches 90%, the high-technology content products mainly comprise high-technology content products such as steel for car panels, high-grade pipeline steel and the like, and the smelting of the varieties of steel needs to adopt an external refining RH vacuum process, so that the external refining RH vacuum plays a vital role in smelting the high-end varieties of steel, and the stability of RH vacuum equipment plays a very important role in lifting the weight.

RH vacuum refining is the most important link in the production of variety steel, and the metallurgical functions of the RH vacuum refining mainly comprise: dehydrogenation, deoxidation, denitrification and decarburization, removing non-metallic inclusions in steel, adjusting the temperature and components of molten steel to make the temperature uniform, improving the purity of the molten steel and meeting the requirements of continuous casting and steel casting. The RH vacuum achieves the molten steel circulation by the principle similar to a 'bubble pump' so as to achieve the metallurgical effect: after the two dipping pipes are inserted into the molten steel for a certain depth, the vacuum pump is started, the vacuum chamber is vacuumized, the molten steel enters the vacuum chamber, meanwhile, the dipping pipes are ascended to input driving gas, the driving gas is subjected to thermal expansion pressure reduction, the specific gravity of the mixture of the molten steel and the gas in the dipping pipes is reduced, the driving molten steel ascends like a fountain and flows into the vacuum chamber, the balance state in the vacuum chamber is damaged, and in order to keep balance, a part of the molten steel returns to a steel ladle from the descending dipping pipes, so that the driving gas drives the molten steel to circulate.

The two dip pipes in the RH vacuum are the most important components of the RH vacuum equipment, the service life of the dip pipe directly influences the smooth production of the variety steel, and the state and the sealing performance of the dip pipe directly influence the components and the quality of the variety steel. The structural composition of the dip pipe comprises: the steel structure member, the outer disc welding of steel structure member have a plurality of anchor pieces divide the multilayer intensive distribution, and steel structure member outside adopts the pouring material to pour and forms, and pouring material thickness is 170 mm. The inner circle of the steel structural member is built by refractory lining bricks, and the gap of the lining brick layer is formed by pouring internal self-flowing castable. The refractory lining brick of the immersion pipe is divided into three layers from bottom to top, and the bottom of the vacuum chamber is provided with a circulating pipe formed by building two layers of refractory bricks. The dip pipe is connected with the bottom of the vacuum chamber through a flange, a dip pipe neck is called between the flange joint of the bottom of the vacuum chamber and a third layer of brick of the dip pipe, the height of the dip pipe neck is 200mm, a dip pipe neck steel structure and the dip pipe steel structure are integrated, and the outer circular surface of the dip pipe neck steel structure is poured through pouring materials.

Because the dip pipe neck does not have air cooling device before, when the dip pipe inserted the molten steel, the dip pipe neck only had steel construction and casting material, receives the molten steel high temperature to bake easily reddish, can take place to wear to leak when serious, influences molten steel composition quality, and the dip pipe damage leads to taking off the production line in advance, reduces the life of dip pipe, also can cause unfavorable influence to the production is smooth going.

The related patent documents are inquired as follows:

chinese patent application No. CN201410090574.2 discloses "a sleeve type dip pipe for RH vacuum refining apparatus", which mainly comprises an annular sleeve, a tubular partition wall, a girder and a flange, wherein: the circular tube-shaped partition wall is arranged in the middle of the annular sleeve, the circular tube-shaped partition wall and the annular sleeve are in the same axis, so that two spaces, namely an inner circular tube and an outer annular tube, are formed on the inner side of the circular tube-shaped partition wall, and the outer side of the circular tube-shaped partition wall is formed between the outer wall of the circular tube-shaped partition wall and the inner wall of the annular sleeve, and the two spaces can be respectively used as an ascending tube and a descending tube of an RH dip pipe. This document is intended to enlarge the flow area of the rising pipe and the falling pipe of the dip pipe, and the ring-shaped jacket, the circular tubular partition wall and the dip pipe are of the same height, and there is no function of cooling the neck portion of the RH dip pipe.

Chinese patent application No. CN201520939211.1 discloses "an RH refining apparatus" which solves the problem that the molten steel circulation amount is difficult to be increased by changing the cross-sectional shape of the dip pipe to increase the equivalent diameter of the RH dip pipe. The document still does not have the function of cooling the neck of the RH dip tube.

Chinese patent application No. CN 201620964738.4 discloses "a long-life RH furnace dip pipe composite structure", which includes a bottom layer refractory ring brick composed of monomer bricks, and is characterized in that: the lower end of each single brick is a connecting part, notches are arranged on two sides of each connecting part, and a groove is formed by combining the notches of two adjacent single bricks on the bottom layer refractory ring brick. The problem solved by the document is to provide a combined structure of an RH furnace dip pipe with long service life, which can increase the bonding firmness of a pouring body and a refractory brick, prevent the pouring body at a port part from collapsing and damaging in advance due to inconsistent thermal expansion under the high-temperature use condition, and can improve the service life of the RH furnace dip pipe.

Chinese patent application No. CN201621091560.3 discloses "masonry structure of RH dip pipe steel construction and lining brick", which includes fire-resistant lining brick, the fluidized bed of material, steel construction, the castable bed of material that sets gradually from inside to outside, and fire-resistant lining brick includes inside lining upper brick and inside lining lower floor's brick, the lower part of steel construction inner wall is evenly fixed with a plurality of support pieces, and the upper portion of inside lining lower floor's brick outer wall is provided with the ring groove who interlocks mutually with the top of support piece. The utility model discloses a support piece's top supports lining lower floor's brick with the interlock of the ring type draw-in groove looks of lining lower floor's brick, prevents that refractory lining brick from sinking, has improved the wholeness ability of dip pipe, has reduced the probability that the circumferential weld produced, has obviously improved the life of RH dip pipe. Although the service life of the dip pipe of the RH furnace can be prolonged, the problems that the neck of the dip pipe is easy to redden when being baked by molten steel at high temperature, the dip pipe penetrates and leaks seriously, the component quality of the molten steel is influenced, and the dip pipe is damaged to cause the dip pipe to be off line in advance cannot be solved.

Chinese patent application number is CN 201721902695.8's literature, and it discloses "a vacuum degassing device", and it includes steel member, refractory lining brick layer, inside casting bed of material, outside casting bed of material and anchor assembly that flows automatically, the fixed a plurality of anchor assembly that have densely distributed of steel member outer disc, the fixed collet that is equipped with in the bottom of circle in the steel member, a plurality of anchor assemblies are also fixed to be equipped with in the collet below, a plurality of anchor assemblies pass through the strengthening rib interconnection, refractory lining brick layer and inside casting bed of material that flows automatically inside are equipped with a plurality of gas blow pipes, a plurality of gas blow pipe circumference distribute, and the looped pipeline intercommunication is passed through on a plurality of outlet duct tops, inside the casting bed of material that flows automatically inside is located to the looped pipeline, and the looped pipeline is equipped with the gas blow pipe entry and feeds through to the. The utility model discloses use refractory material to be the pouring material, RH dip pipe steel component and the peripheral densely covered anchor assembly of collet to be equipped with the strengthening rib, increase the steadiness of pouring material, increase the life of RH dip pipe. The document teaches that the reinforcing rib reinforcement castable, with the plurality of gas injection tubes distributed circumferentially, is meant that the riser molten steel of the dip tube drives the gas argon mini-tube, not the neck air cooling device.

In summary, the same RH dip tube neck air cooling device as in this patent is not found in the published literature. The RH dip pipe neck air cooling is very important as mentioned above, and is very effective for smooth production, improving the quality of molten steel, prolonging the service life of the dip pipe, reducing the cost and the like. And no related cooling technology exists in China, and the main reasons are as follows: the dip pipe neck only has a steel structure and pouring materials, does not have refractory bricks, belongs to the weakest link of the dip pipe, adopts air cooling, and if the steel structure welding technology and the pouring sintering technology of the dip pipe neck are not too hard to cause cracks or penetration leakage, cooling air can enter molten steel to cause molten steel oxidation to influence the quality of molten steel components, and the entering amount of the cooling air is larger than that of natural air only without the cooling air, so other peers do not adopt dip pipe neck air cooling devices based on the worry.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the not enough of prior art existence, provide one kind and enable RH steeping device life cycle and improve 140 times by original 110 times, reduce the molten steel and change the rate of judgement and be not less than 0.5%, and simple structure, high RH steeping device that has the cooling efficiency of security.

The technical measures for realizing the purpose are as follows:

an RH steeping device with cooling effect mainly comprises a first steeping pipe, a second steeping pipe, a first neck part on the first steeping pipe, a second neck part on the second steeping pipe, a first neck part, an anchoring part on the second steeping pipe and the second neck part, and a pouring material layer, and is characterized in that: neck sleeves are respectively sleeved on the first neck and the second neck, cooling air channels are respectively formed between the first neck and the second neck and the neck sleeves, and the width of each cooling air channel is 45-55 mm; the height is 180-220 mm; the neck sleeve is provided with an air inlet and an air outlet, a cooling air channel between the air inlet and the air outlet is connected with a closed baffle, and the height and the width of the closed baffle are the same as those of the cooling air channel; the air inlet is connected with an air pipe, and the air pipe is connected with a cooling air source; the exhaust port is connected with an exhaust pipe; and respectively moving the anchoring parts and the pouring material layer on the first neck part and the second neck part to the neck sleeve.

Further: the gas pipe is provided with an adjusting switch.

Further: the width of the cooling air channel is 45-55 mm; the height is 180-220 mm.

The utility model has the characteristics that: the service cycle of the RH dipping device can be increased from the original average 110 times to the average 140 times, the judgment rate of the molten steel can be reduced by at least 0.5%, the RH dipping device has the advantages of simple structure, low cost and high safety, no crack or penetration and leakage can be generated, and cooling air can not enter the molten steel so as to cause the oxidation of the molten steel to influence the quality of molten steel components.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a first dip pipe or a second dip pipe in FIG. 1;

FIG. 3 is a schematic view of the neck sleeve of FIGS. 1 or 2;

in the figure: 1-dip pipe one, 2-dip pipe two, 3-neck one, 4-neck two, 5-anchoring piece, 6-casting material layer, 7-neck sleeve, 8-cooling gas channel, 9-gas inlet, 10-gas outlet, 11-sealing baffle, 12-gas pipe, 13-cooling gas source, 14-gas exhaust pipe, 15-regulating switch.

Detailed Description

The following is further described in conjunction with the appended drawings:

an RH dipping device with a cooling effect mainly comprises a dipping pipe I1, a dipping pipe II 2, a neck part I3 on the dipping pipe I1, a neck part II 4 on the dipping pipe II 2, a dipping pipe I1 and a neck part I3, an anchoring part 5 on the dipping pipe II 2 and the neck part II 4, and a casting material layer 6, wherein neck part sleeves 7 are respectively sleeved on the neck part I3 and the neck part II 4, cooling air channels 8 are respectively formed between the neck part I3 and the neck part II 4 and the neck part sleeves 7, and the width of the cooling air channels is 45mm/51mm/55 mm; the height is 180mm/195mm/220 mm; an air inlet 9 and an air outlet 10 are processed on the neck sleeve 7, a closed baffle 11 is connected on the cooling air channel 8 between the air inlet 9 and the air outlet 10, and the height and the width of the closed baffle 11 are the same as those of the cooling air channel 8; the air inlet 9 is connected with an air pipe 12 through welding or a joint, and the air pipe 12 is connected with a cooling air source 13 through a joint; an exhaust pipe 14 is connected to the exhaust port 10 by welding or a joint; the anchoring elements 5 and the castable layer 6 on the first neck 3 and the second neck 4 respectively move onto the neck sleeve 7.

In order to adjust the cooling air quantity according to specific conditions, an adjusting switch 15 is also arranged on the air conveying pipe 12.

Principle of cooling

Cooling gas with the pressure of 0.1-0.5 MPa from a cooling gas source 13) flows through a gas conveying pipe 12, enters the cooling gas channel 8 through the gas inlet 9, flows in the cooling gas channel 8 to cool the neck part 2 of the dip pipe, continues to flow to the gas outlet 10, then flows through the gas exhaust pipe 14 and is exhausted; due to the effect of the closing baffle 11, the hot gas after cooling the dip tube neck 2 does not mix with the incoming cooling gas.

The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.

Claims (2)

1. The utility model provides a RH steeping device with cooling efficiency, mainly by dip tube one, dip tube two, on dip tube one neck one, dip tube two neck two, dip tube one and neck one and dip tube two and neck two on anchor assembly and the pouring material layer constitute, its characterized in that: neck sleeves are respectively sleeved on the first neck and the second neck, cooling air channels are respectively formed between the first neck and the second neck and the neck sleeves, and the width of each cooling air channel is 45-55 mm; the height is 180-220 mm; the neck sleeve is provided with an air inlet and an air outlet, a cooling air channel between the air inlet and the air outlet is connected with a closed baffle, and the height and the width of the closed baffle are the same as those of the cooling air channel; the air inlet is connected with an air pipe, and the air pipe is connected with a cooling air source; the exhaust port is connected with an exhaust pipe; and respectively moving the anchoring parts and the pouring material layer on the first neck part and the second neck part to the neck sleeve.

2. An RH dipping device with cooling effect as claimed in claim 1, wherein: the gas pipe is provided with an adjusting switch.

Images