阅读说明：本技术 一种转炉溅渣护炉用混喷装置及其使用方法 (Mixed spraying device for converter slag splashing protection and use method thereof ) 是由 乌力平 徐小伟 于 2019-12-16 设计创作，主要内容包括：本发明涉及转炉领域,具体来说是一种转炉溅渣护炉用混喷装置及其使用方法,包括枪体,所述枪体内部中空形成中通通道,所述枪体端部设有喷头；所述中通通道与喷头相连通；所述枪体连接有用于供氮的供气管道和用于供水的供水管道。本发明公开了一种转炉溅渣护炉用混喷装置,采用在溅渣氮气中加入数量可控的水混合喷吹,通过水的急速汽化降低炉渣过热度并达到目标渣粘度、过热度范围,缩短溅渣时间,减少氮气消耗和减少溅渣前期高温氧化渣对炉衬的机械和化学侵蚀的目的。(The invention relates to the field of converters, in particular to a mixed spraying device for converter slag splashing protection and a using method thereof, wherein the mixed spraying device comprises a gun body, a hollow through channel is formed in the gun body, and a spray head is arranged at the end part of the gun body; the middle through channel is communicated with the spray head; the gun body is connected with an air supply pipeline for supplying nitrogen and a water supply pipeline for supplying water. The invention discloses a mixed spraying device for slag splashing protection of a converter, which is characterized in that controllable amount of water is added into slag splashing nitrogen for mixed spraying, the superheat degree of slag is reduced through rapid vaporization of the water, the range of target slag viscosity and superheat degree is reached, the slag splashing time is shortened, the nitrogen consumption is reduced, and the purposes of mechanical and chemical erosion of high-temperature oxidizing slag on a furnace lining in the early slag splashing stage are reduced.)

1. The mixed spraying device for the converter slag splashing protection is characterized by comprising a gun body, wherein a hollow through channel is formed in the gun body, and a spray head is arranged at the end part of the gun body; the middle through channel is communicated with the spray head; the gun body is connected with an air supply pipeline for supplying nitrogen and a water supply pipeline for supplying water.

2. The mixing and spraying device for the converter splash protection of the converter as claimed in claim 1, wherein the water supply pipeline and the gas supply pipeline are both communicated with the through channel in the lance body.

3. The mixed spraying device for the converter splash protection of the converter as claimed in claim 1, wherein the water supply pipeline and the gun body interface are positioned above the air supply pipeline and the gun body interface.

4. The mixed spraying device for the converter splash protection of the converter as claimed in claim 1, wherein the gun body comprises an inner layer pipe, a middle layer pipe and an outer layer pipe, the middle layer pipe is sleeved outside the inner layer pipe, and the outer layer pipe is sleeved outside the middle layer pipe; the inner layer pipe, the middle layer pipe and the outer layer pipe are coaxially arranged; the inner-layer pipe inner channel forms a middle through channel; a cooling water inlet channel is formed in a gap between the middle-layer pipe and the inner-layer pipe; a cooling water outlet pipeline is formed in a gap between the middle-layer pipe and the outer-layer pipe; and one end of the middle-layer pipe, which is close to the spray head, is provided with a communicating hole, and the communicating hole is used for communicating a cooling water carrying water channel with a cooling water outlet channel.

5. The mixed spraying device for the converter splash and protection according to claim 1, wherein the gun body is provided with a supporting block, and the supporting block is in an inverted frustum shape.

6. The mixed spraying device for the converter splashing protection furnace of claim 2, wherein a blocking plate is arranged at one end of the water supply pipeline close to the through channel, and the blocking plate is provided with water permeable holes.

7. The use method of the mixed spraying device for the converter splash protection of the converter as claimed in any one of claims 1 to 6, characterized by comprising the following steps:

(1) in the slag splashing operation process, N ₂、H ₂O is respectively input into the gun body through an air supply pipeline and a water supply pipeline, and N ₂、H ₂Mixing the O in the gun body, spraying the O into the converter through the gun body by a spray head to perform slag splashing operation;

(2) adopting N in earlier stage of slag splashing ₂And H ₂And (3) spraying the O mixture into the converter, closing the water supply pipeline after the slag is cooled to a set range value, continuously opening the gas supply pipeline, and independently adopting nitrogen single spraying at the later stage of slag splashing until the operation of slag splashing for protecting the converter is completed.

8. The use method of the mixed spraying device for converter splash protection according to claim 7, wherein N is required in the step (1) ₂And H ₂When O is mixed, the water pressure is greater than the pressure of nitrogen.

9. The use method of the mixing and spraying device for converter splash protection according to claim 7, wherein the water flow rate when mixing N2 and H2O in the step (1) is Q ═ A × C0.25; q is liquid water flow, kg/min; a is coefficient, take 1-10; c is the nominal capacity of the converter.

Technical Field

The invention relates to the field of converters, in particular to a mixed spraying device for converter slag splashing protection and a using method thereof.

Background

The slag splashing furnace protection is that after the tapping of the converter is finished and the slag is modified, nitrogen is blown to the slag through an oxygen lance, so that the slag is splashed and attached to the furnace lining to form a protective slag layer for the furnace lining, and the mechanical erosion and the chemical erosion of the furnace lining in the steelmaking process are reduced, thereby achieving the purposes of protecting the furnace lining and improving the furnace life.

The properties of the slag have an important influence on the slag splashing protection effect, and among the physical properties of the slag, the viscosity, melting temperature and superheat degree of the slag have an important influence on the slag splashing protection. The melting temperature of the furnace slag is low, when the superheat degree is high, a slag splashing layer is easy to melt and delaminate, and the furnace lining protection effect is poor; under the condition of the same components, the higher the superheat degree is, the smaller the slag viscosity is, the slag is easy to splash but difficult to stick, and a splashed slag layer is thin; when the viscosity of the slag is too high, the slag is difficult to splash and hang on the furnace wall; therefore, the slag splash needs proper viscosity and superheat degree.

The traditional slag splashing process mainly has the following problems:

(1) the cooling rate of the slag is slow. Besides providing slag splashing kinetic energy, nitrogen blowing also has the function of cooling slag (slag is mainly cooled in the early stage of slag splashing because the degree of superheat of the slag is high in the period of time, the viscosity of the slag is low, and the slag is not well bonded even if the slag splashes onto the furnace wall). Because the heat capacity of slag splashing gas is small, the cooling speed of slag is slow, the inoculation period of the slag splashing required proper viscosity is long, and the whole slag splashing furnace protection period is long, the steel making production efficiency is low, and the nitrogen consumption is large.

(2) Has certain damage to the original furnace lining. The high-temperature final slag has strong oxidability and low viscosity, and is pushed by strong nitrogen flow to generate high-speed scouring on a furnace lining sintering layer, so that chemical erosion and mechanical damage to a certain degree exist. The slower the slag temperature decreases, the slower the slag viscosity increases and the more severe the damage.

Therefore, in order to solve the above problems, an apparatus or a method for splashing slag in a converter, which can avoid the above problems, is now required.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a novel device for splashing slag of a converter, which can reduce the consumption of nitrogen and reduce the mechanical and chemical erosion of the furnace lining caused by high-temperature oxidation slag in the slag splashing early stage.

In order to achieve the purpose, the invention adopts the technical scheme that:

a mixed spraying device for converter slag splashing protection comprises a gun body, wherein a hollow through channel is formed in the gun body, and a spray head is arranged at the end part of the gun body; the middle through channel is communicated with the spray head; the gun body is connected with an air supply pipeline for supplying nitrogen and a water supply pipeline for supplying water.

The water supply pipeline and the gas supply pipeline are communicated with the through channel in the gun body.

The water supply pipeline and the gun body interface are positioned above the air supply pipeline and the gun body interface.

The gun body comprises an inner layer pipe, a middle layer pipe and an outer layer pipe, wherein the middle layer pipe is sleeved outside the inner layer pipe, and the outer layer pipe is sleeved outside the middle layer pipe; the inner layer pipe, the middle layer pipe and the outer layer pipe are coaxially arranged; the inner-layer pipe inner channel forms a middle through channel; a cooling water inlet channel is formed in a gap between the middle-layer pipe and the inner-layer pipe; a cooling water outlet pipeline is formed in a gap between the middle-layer pipe and the outer-layer pipe; and one end of the middle-layer pipe, which is close to the spray head, is provided with a communicating hole, and the communicating hole is used for communicating a cooling water carrying water channel with a cooling water outlet channel.

The gun body is provided with a supporting block which is in an inverted frustum shape.

One end of the water supply pipeline, which is close to the through channel, is provided with a blocking plate, and the blocking plate is provided with a water permeable hole.

A use method of a mixed spraying device for splashing slag and protecting a converter comprises the following steps:

(1) in the slag splashing operation process, N ₂、H ₂O is respectively input into the gun body through an air supply pipeline and a water supply pipeline, and N ₂、H ₂Mixing the O in the gun body, spraying the O into the converter through the gun body by a spray head to perform slag splashing operation;

(2) adopting N in earlier stage of slag splashing ₂And H ₂Spraying the mixture of O into the converter, cooling the slag to a set range, closing the water supply pipeline, continuously opening the gas supply pipeline, independently adopting single nitrogen spraying in the later stage of slag splashing until the slag is splashed,

and finishing the slag splashing furnace protection operation.

Requiring N in the step (1) ₂And H ₂When O is mixed, the water pressure is greater than the pressure of nitrogen.

The water flow rate when N2 and H2O are mixed in the step (1) is Q ═ A × C × 0.25; q is the flow rate of the liquid water,

kg/min; a is coefficient, take 1-10; c is the nominal capacity of the converter.

The invention has the advantages that:

the invention discloses a mixed spraying device for slag splashing protection of a converter, which is characterized in that controllable amount of water is added into slag splashing nitrogen for mixed spraying, the superheat degree of slag is reduced through rapid vaporization of the water, the range of target slag viscosity and superheat degree is reached, the slag splashing time is shortened, the nitrogen consumption is reduced, and the purposes of mechanical and chemical erosion of high-temperature oxidizing slag on a furnace lining in the early slag splashing stage are reduced.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the gun body of the present invention.

Fig. 3 is a schematic structural view of the barrier plate of the present invention in use.

Fig. 4 is a front view of a barrier plate according to the present invention.

The labels in the above figures are:

1. air supply pipeline, 2, cooling water inlet pipe, 3, cooling water return pipe, 4, water supply pipeline, 5, the rifle body, 6, shower nozzle.

Detailed Description

The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.

A mixed spraying device for converter slag splashing protection comprises a gun body 5, wherein a hollow middle channel 5-11 is formed in the gun body 5, and a spray head 6 is arranged at the end part of the gun body 5; the middle channel 5-11 is communicated with the spray head 6; the gun body 5 is connected with an air supply pipeline 1 for supplying nitrogen and a water supply pipeline 4 for supplying water; the water supply pipeline 4 supplies water for the converter, the gas supply pipeline 1 is used for blowing gas into the converter, through the cooperation of the two, the rapid vaporization of water liquid reduces the superheat degree of slag and reaches the viscosity and superheat degree range of target slag, the slag splashing time is shortened, the blowing of nitrogen provides the kinetic energy of slag splashing, and through the cooperation of the two, the nitrogen consumption can be reduced, and the purposes of mechanical and chemical erosion of the furnace lining by the high-temperature oxidation slag in the slag splashing front stage can be reduced.

Preferably, in the present invention, the water supply pipeline 4 and the gas supply pipeline 1 are both communicated with the through channels 5-11 in the gun body 5; by the arrangement, water supplied by the water supply pipeline 4 into the middle through channel 5-11 and gas supplied by the gas supply pipeline 1 into the middle through channel 5-11 can be mixed in the gun body 5, the mixed liquid of nitrogen and water is sprayed into the converter from the spray head 6, the superheat degree of slag is reduced by rapid vaporization of water, the viscosity and superheat degree range of target slag are reached, slag splashing time is shortened, nitrogen consumption is reduced, and mechanical and chemical erosion of high-temperature oxidation slag on a furnace lining in the early stage of slag splashing is reduced.

Preferably, in the invention, the joint of the water supply pipeline 4 and the gun body 5 is positioned above the joint of the air supply pipeline 1 and the gun body 5; such structural design for the water liquid that gas supply line 1 supplied is at gaseous rear end, and gas can have a effect of blowing off to water liquid, has better realization the mixture of nitrogen gas and water liquid.

Preferably, the gun body 5 comprises an inner layer pipe 5-1, a middle layer pipe 5-2 and an outer layer pipe 5-3, wherein the middle layer pipe 5-2 is sleeved outside the inner layer pipe 5-1, and the outer layer pipe 5-3 is sleeved outside the middle layer pipe 5-2; the inner layer pipe 5-1, the middle layer pipe 5-2 and the outer layer pipe 5-3 are coaxially arranged; the inner channel of the inner-layer pipe 5-1 forms a middle through channel 5-11; a cooling water inlet channel 5-22 is formed in a gap between the middle-layer pipe 5-2 and the inner-layer pipe 5-1; a gap between the middle layer pipe 5-2 and the outer layer pipe 5-3 forms a cooling water outlet pipe 5-33; one end of the middle-layer pipe 5-2, which is close to the spray head 6, is provided with a communicating hole, and the communicating hole is used for communicating a cooling water carrying water channel with a cooling water outlet channel; three layers of pipelines are arranged, so that three channels are formed on the inner side of the gun body 5, and the middle channel is used for spraying mixed liquid; the other two channels can be used for cooling the gun body 5, and the gun body 5 can be well cooled through the operation of the two channels outside the cooling water; in addition, the cooling water inlet channels 5-22 are arranged at the inner sides, so that the influence of the temperature of the converter on the temperature of the mixed liquid can be reduced.

Preferably, the gun body 5 is provided with a supporting block 7, and the supporting block 7 is in an inverted frustum shape; the cooperation of supporting shoe 7 can realize the placement of rifle body 5 at the converter mouth, and the supporting shoe 7 can realize the suspension of rifle body 5 with the cooperation of stove mouth.

Preferably, in the present invention, a blocking plate 41 is provided at one end of the water supply pipeline 4 near the through channels 5-11, and water permeable holes 42 are provided on the blocking plate 41; because the setting of barrier 41 for when the water liquid got into rifle body 5, the inevitable division becomes a plurality of water columns, and this forms a water spray column, and follow-up in rifle body 5 inside is integrated together, and divides into a plurality of water columns, has increased the area of contact of water liquid with nitrogen gas, has optimized the mixture of nitrogen gas and water liquid.

A use method of a mixed spraying device for splashing slag and protecting a converter comprises the following steps:

(1) in the slag splashing operation process, N ₂、H ₂O is respectively input into the gun body 5 through an air supply pipeline 1 and a water supply pipeline 4, and N is ₂、H ₂O is mixed in the gun body 5 and then is sprayed into the converter through the gun body 5 by the spray head 6 for slag splashing operation;

(2) adopting N in earlier stage of slag splashing ₂And H ₂And (3) spraying the O mixture into the converter, after the slag is cooled to a set range value, closing the water supply pipeline 4, continuously opening the gas supply pipeline 1, and independently adopting nitrogen single spraying at the later stage of slag splashing until the operation of slag splashing and furnace protection is completed.

Requiring N in the step (1) ₂And H ₂When O is mixed, the water pressure is greater than the pressure of nitrogen; the influence of nitrogen on water flow is ensured, and meanwhile, the normal flow of water is ensured, and the cooling of the converter is ensured.

Preferably, in the present invention, in the step (1), N2 and H2O are mixed to form a water flow rate Q ═ a × C0.25; q is liquid water flow, kg/min; a is coefficient, take 1-10; c is the nominal capacity of the converter; through the disclosure of the formula, the purpose of the invention can be better achieved.

The following is discussed in conjunction with specific embodiments:

example 1: 300-ton slag splashing furnace protection process and device

A slag splashing furnace protection process for a 300-ton converter adds different atomized water amounts into different stages of a slag splashing process to obtain H ₂O-N ₂The mixed spraying is carried out on the surface of the slag to cool the slag, thereby rapidly reducing the superheat degree of the slag, achieving the purposes of quickly starting the slag, shortening the slag splashing time and reducing the nitrogenThe purpose of consumption.

The main parameters of the slag splashing furnace protection process of the 300-ton converter are as follows: the nitrogen supply flow is 1000-1050m3/min, the working nitrogen pressure is 0.95-1.05Mpa, the total pipe nitrogen pressure is 2.0-2.2Mpa, and the lance position is 1.5-4.5m (from the bottom of the furnace).

A mixed spraying device for converter splash protection comprises a gas supply pipeline 1, a gun body cooling water inlet pipe 2, a gun body cooling water return pipe 3, a water supply pipeline 4, a gun body 5 and a spray head 6;

the gun body 5 is a hollow cylindrical cavity and comprises an inner layer pipe 5-1, a middle layer pipe 5-2 and an outer layer pipe 5-3, the spray head 6 is made of copper material, and other parts are 16 MnR;

the inner layer pipe 5-1 is communicated with the gas supply pipeline 1 and the water supply pipeline 4;

the middle-layer pipe 5-2 is communicated with the gun body cooling water inlet pipe 2;

the outer layer pipe 5-3 is communicated with the gun body cooling water return pipe 3.

In the slag splashing operation process, N ₂、H ₂O is respectively input and mixed through an air supply pipeline 1 and a water supply pipeline 4, and then is sprayed out of the spray head 6 through the gun body 5 to splash slag;

adopting H in earlier stage of slag splashing ₂O-N ₂Mixed spraying, and nitrogen single spraying at the later stage of slag splashing;

the outer diameter of the water supply pipeline 4 is 50mm, the wall thickness is 8mm, and the water flow is 500kg/min during mixed spraying operation; the pressure is 2.3-2.50 Mpa; the nitrogen flow is 1000-1050m 3/min; the gun position is 1.8m in the first 1-2 minutes.

The mixed spraying water: suspended substance is less than 50mg/L, PH is 7-8, hardness is less than 100mg/L, and oil is less than 5 mg/L.

Each pipeline is provided with a control valve, and the opening sequence of the gas supply pipeline 1 and the water supply pipeline 4 is as follows: and (3) starting sequence: air supply pipeline 1 is opened earlier, opens water supply pipeline 4 again, guarantees the mixture of nitrogen gas and water liquid, has certain slagging-off ability simultaneously, stops the order: the water supply line 4 is closed first and the gas supply line 1 is closed later, partly because of the self-definition of the production sequence.

It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.