CN219385215U

CN219385215U - Anti-blocking drainage device of RH furnace water-cooling straight pipe

Info

Publication number: CN219385215U
Application number: CN202320475014.3U
Authority: CN
Inventors: 邹春锋; 韩蕾蕾; 李四军; 郝帅; 付常伟; 李萍; 石红燕
Original assignee: Shandong Iron and Steel Co Ltd
Current assignee: Shandong Iron and Steel Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-07-21
Anticipated expiration: 2033-03-14

Abstract

The utility model relates to the technical field of ferrous metallurgy steelmaking, and particularly discloses an anti-blocking drainage device of a water-cooling straight pipe of an RH furnace, which comprises a gas purging mechanism and a drainage mechanism, wherein the drainage mechanism is arranged at the bottom of the water-cooling straight pipe and is used for draining accumulated water at the bottom of the water-cooling straight pipe; in the utility model, under the high dust environment of the water-cooling straight pipe, inert gas is blown into the drainage pipeline to protect the drainage pipe; under the condition that water vapor appears in the water-cooling straight pipe, the drain valve is opened and the air valve is closed for operation, the drain device meets the operation requirements under different working conditions of the RH furnace, solves the problem that the drain pipe is easy to block and can not drain water, also avoids the troublesome conditions of slow vacuum degree reduction and the like in the early stage of vacuum treatment, and provides powerful guarantee for the production stability of the RH furnace.

Description

Anti-blocking drainage device of RH furnace water-cooling straight pipe

Technical Field

The utility model relates to the technical field of ferrous metallurgy steelmaking, in particular to an anti-blocking drainage device of a water-cooling straight pipe of an RH furnace.

Background

The RH furnace is used as vacuum metallurgical equipment, and the vacuum degree parameter is an important index for ensuring the success of molten steel smelting; the water-cooling straight pipe is used as a channel for exhausting waste gas and dust of the RH vacuum tank, is subjected to the reaction of hydrogen and oxygen in the baking process of the vacuum tank, and the generated water vapor can be reserved in the water-cooling straight pipe under the high-temperature environment; meanwhile, steel slag dust sucked in vacuum in the smelting process can be accumulated in the water-cooling straight pipe; a drain pipe is arranged under the water-cooling straight pipe to remove moisture generated by baking, but the generated steel slag particles and dust are easy to cause blockage of the drain pipe, accumulated water cannot be discharged sufficiently, a load is caused on a vacuum pump for sucking, the vacuum degree in the earlier stage of RH furnace smelting is reduced slowly, and the vacuum degree cannot meet the technical standard requirement in a short time; the occurrence of the problem is very easy to bring larger influence to RH smelting period, and even affects the problems of decarburization, dehydrogenation rate and the like. Therefore, there is a need to design an anti-clogging drainage device for a water-cooled straight tube of an RH furnace.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model aims to provide an anti-blocking drainage device of a water-cooling straight pipe of an RH furnace.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides an anti-blocking drainage device of RH stove water-cooling straight tube, includes gas purge mechanism and drainage mechanism, drainage mechanism installs in the bottom of water-cooling straight tube, and the ponding of drainage mechanism drainage water-cooling straight tube bottom, installs gas purge mechanism on the drainage mechanism, and gas purge mechanism sweeps drainage mechanism's drain pipe.

Specifically, the drainage mechanism comprises a drainage pipe and a drainage valve, wherein the drainage pipe is vertically arranged at the bottom of the water-cooling straight pipe, and the drainage valve is arranged on the drainage pipe.

Specifically, the gas purging mechanism comprises a gas blowing pipe, a gas blowing valve and nitrogen gas supply equipment, wherein the gas blowing pipe is vertically arranged on the drain pipe, the other end of the gas blowing pipe is connected with the nitrogen gas supply equipment, and the gas blowing valve is arranged on the gas blowing pipe.

Specifically, the joint of the air blowing pipe and the drain pipe is arranged between the water-cooling straight pipe and the drain valve.

The utility model has the following beneficial effects:

the anti-blocking drainage device for the water-cooling straight pipe of the RH furnace fully considers the drainage operation of the pipeline under the high-temperature and high-dust environment of steel making, and distinguishes different requirements of the drainage pipe of the water-cooling straight pipe under two working states of RH furnace treatment and vacuum tank baking operation, and inert gas is blown into the drainage pipe under the high-dust environment of the water-cooling straight pipe, so that the drainage pipe is protected; under the condition that water vapor appears in the water-cooling straight pipe, the drain valve is opened and the air valve is closed for operation, the drain device meets the operation requirements under different working conditions of the RH furnace, solves the problem that the drain pipe is easy to block and can not drain water, also avoids the troublesome conditions of slow vacuum degree reduction and the like in the early stage of vacuum treatment, and provides powerful guarantee for the production stability of the RH furnace.

Drawings

FIG. 1 is a schematic diagram of an anti-clogging drainage device for a RH furnace water-cooled straight pipe.

In the figure: 1-an air blowing pipe; 2-an air blowing valve; 3-a drain pipe; 4-a drain valve; 5-a water-cooling straight pipe.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described in further detail below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the anti-blocking drainage device of the RH furnace water-cooling straight pipe comprises a gas purging mechanism and a drainage mechanism, wherein the drainage mechanism comprises a drainage pipe 3 and a drainage valve 4, the drainage pipe 3 is vertically arranged at the bottom of the water-cooling straight pipe 5, and the drainage valve 4 is arranged on the drainage pipe 3. The gas purging mechanism comprises a gas blowing pipe 1, a gas blowing valve 2 and nitrogen gas supply equipment, wherein the gas blowing pipe 1 is vertically arranged on the drain pipe 3, the other end of the gas blowing pipe 1 is connected with the nitrogen gas supply equipment, and the gas blowing valve 2 is arranged on the gas blowing pipe 1. The joint of the air blowing pipe 1 and the drain pipe 3 is arranged between the water-cooling straight pipe 5 and the drain valve 4.

The water-cooling straight pipe 5 has the main function of an exhaust pipeline of an RH furnace, and accumulated water and steel slag dust in the water-cooling straight pipe 5 are accumulated during the baking of a vacuum tank and the treatment operation of the RH furnace, so that the problem of poor vacuum degree in the smelting process is easily caused; the drainage device fully considers the influence of steel slag dust on drainage, and under the condition of no drainage, the smoothness of the drainage pipe 3 is ensured by utilizing the gas purging mechanism, so that the full drainage of accumulated water in the water-cooling straight pipe 5 is ensured, and the stability of vacuum degree parameters in the smelting process of the RH furnace is ensured.

The drain valve 4 is arranged at the outlet of the drain pipe, namely at the lower part, so that when the drain valve 4 is closed, the gas purging mechanism blows nitrogen into the drain pipe 3, and the inlet of the drain pipe 3 is prevented from being blocked; the inner diameter of the drain pipe 3 is controlled to be 20-30 mm, and the inner diameter of the air blowing pipe 1 of the air blowing mechanism is controlled to be 10-15 mm.

An anti-blocking drainage method of a RH furnace water-cooling straight pipe comprises the following steps:

1) After the RH furnace vacuum tank is on line, baking the refractory material in the vacuum tank by using a top gun; simultaneously, a drainage valve 4 of a water-cooling straight pipe 5 is opened, a blowing valve 2 of a gas blowing mechanism is closed, water vapor is discharged normally, and when the baking temperature of the vacuum tank refractory reaches over 1100 ℃, the vacuum tank has the production condition of smelting steel, and the top gun stops baking;

2) Before RH furnace smelting, top lance baking is stopped, a water-cooling straight pipe 5 drainage valve 4 is closed, a gas blowing valve 2 of a gas blowing mechanism is opened, nitrogen is adopted as a gas source of nitrogen gas supply equipment, and the pressure of the nitrogen gas is controlled to be 0.3-0.6 Mpa;

3) Under the condition that the RH furnace does not produce for a long time such as casting replacement, a drainage valve 4 of the water-cooling straight pipe 5 is opened, a blowing valve 2 of the gas blowing mechanism is closed, baking operation is carried out in the vacuum tank, and the steps 2) and 3) are circularly executed when the RH furnace is reused in the later period.

Example 1:

1) The RH furnace vacuum tank number is 5/9 (upper part/lower part), after the RH furnace vacuum tank is arranged at the treatment position, the top gun is utilized to bake the vacuum tank refractory, and the oxygen flow rate is as follows: 500Nm ³ 500Nm gas flow per hour ³ /h; simultaneously, a drainage valve 4 of a water-cooling straight pipe 5 is opened, a blowing valve 2 of a gas blowing mechanism is closed and opened, and water vapor is normally discharged; the baking temperature of the vacuum tank refractory is 1102 ℃, and the vacuum tank has the production condition of smelting steel.

2) Before RH furnace smelting, the top gun stops baking, the water-cooling straight pipe 5 is closed, the air blowing valve 2 of the air blowing mechanism is opened, the air source of the air blowing mechanism adopts nitrogen, the pressure of the nitrogen is 0.45Mpa, and the inner diameter of the water-cooling straight pipe 3 is controlled at 25mm.

Entering station furnace number: h231-01126, smelting steel types: DC04, smelting period 35min, RH vacuum treatment 3.5min, vacuum degree up to 67pa, and compliance with vacuum degree technical parameters.

In summary, the drain pipe device adopting the water-cooling straight pipe 5 of the utility model can completely meet the production requirement of the RH furnace after the drain operation treatment, and the device has simple and practical design and high operation stability; the smoothness of the drain pipe 3 is ensured by utilizing the gas purging mechanism, the channel is prevented from being blocked by accumulation of high-temperature steel slag dust, and stable conditions are provided for the drainage during the baking operation of the vacuum tank; provides necessary production conditions for the rapid reduction of the vacuum degree of the RH furnace, and ensures the metallurgical effect of molten steel vacuum circulation.

The present utility model is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present utility model can fall within the scope of the present utility model if the present utility model has the same or similar technical solutions.

The technology, shape, and construction parts of the present utility model, which are not described in detail, are known in the art.

Claims

1. The anti-blocking drainage device for the RH furnace water-cooling straight pipe is characterized by comprising a gas purging mechanism and a drainage mechanism, wherein the drainage mechanism is arranged at the bottom of the water-cooling straight pipe and is used for discharging accumulated water at the bottom of the water-cooling straight pipe, the gas purging mechanism is arranged on the drainage mechanism and is used for purging a drainage pipe of the drainage mechanism.

2. The anti-clogging drainage device for the water-cooled straight pipe of the RH furnace according to claim 1, wherein the drainage mechanism comprises a drainage pipe and a drainage valve, the drainage pipe is vertically arranged at the bottom of the water-cooled straight pipe, and the drainage valve is arranged on the drainage pipe.

3. The anti-clogging drainage device for the water-cooled straight pipe of the RH furnace according to claim 1, wherein the gas purging mechanism comprises a gas blowing pipe, a gas blowing valve and nitrogen gas supply equipment, the gas blowing pipe is vertically arranged on the drain pipe, the other end of the gas blowing pipe is connected with the nitrogen gas supply equipment, and the gas blowing valve is arranged on the gas blowing pipe.

4. The anti-clogging drainage device for the water-cooled straight pipe of the RH furnace according to claim 3, wherein the joint of the air blowing pipe and the drainage pipe is arranged between the water-cooled straight pipe and the drainage valve.