CN215887108U

CN215887108U - High-efficient cooling structure of heavy-calibre oxygen rifle shower nozzle

Info

Publication number: CN215887108U
Application number: CN202121202563.0U
Authority: CN
Inventors: 李山宏; 徐福龙; 廖轶; 闫心怡; 侯春; 韩玲; 谢国威; 郎存正
Original assignee: Sinosteel Anshan Research Institute of Thermo Energy Co Ltd
Current assignee: Sinosteel Anshan Research Institute of Thermo Energy Co Ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2022-02-22
Anticipated expiration: 2031-06-01

Abstract

An efficient cooling structure of a large-diameter oxygen lance nozzle is provided with two water inlet channels from inside to outside, and the two water inlet channels are communicated with a water outlet. Comprises a flow guide nozzle, an oxygen spray hole, a flow guide island, an upper flow guide plate, a lower flow guide plate, an arc flow guide plate, a conical water distribution disc, an inner pipe, a middle pipe and an outer pipe. The utility model arranges two independent water inlet channels, wherein one cooling water is specially used for cooling the central area of the lower part of the oxygen lance nozzle. The other path of cooling water is used for cooling the edge part area of the end surface of the spray head and the outer wall of the oxygen lance, and the flow rates of the two paths of water inlet can be independently controlled without mutual interference, so that the cooling efficiency of the spray head of the oxygen lance is improved, and the service life of the oxygen lance is prolonged.

Description

High-efficient cooling structure of heavy-calibre oxygen rifle shower nozzle

Technical Field

The utility model belongs to the technical field of converter steelmaking blowing, and particularly relates to an efficient cooling structure of a large-diameter oxygen lance nozzle.

Background

In the converter steelmaking production, the oxygen lance is an indispensable core device, and with the large-scale of domestic converter steelmaking equipment, the oxygen lance develops from a small converter of dozens of tons to a large converter of 350 tons, the outer diameter of the matched oxygen lance also develops from the initial 76mm to 402mm, and the oxygen lance nozzle also develops from a single-hole structure to a six-hole structure. The oxygen lance is highly heated by heat radiation because the oxygen lance works under the condition of high temperature in the furnace, particularly the end area of the oxygen lance nozzle is the area with the highest heat exchange, and the area sometimes has the condition of bulge and the like because of poor cooling effect. Therefore, a good oxygen lance cooling system plays a vital role in the service life of the oxygen lance cooling system, but the requirement on the cooling system is higher and higher as the structural size of the oxygen lance nozzle is larger, and the reasonable oxygen lance cooling system is more important for the large-diameter oxygen lance nozzle.

The related patents and the known technical documents of the cooling structure of the oxygen lance nozzle are as follows:

patent CN209456495U describes "an oxygen lance with a water diversion structure", in the oxygen lance nozzle, through setting up a water diversion plate and a water diversion pipe water diversion structure, control the flow direction of cooling water, cool down the shower nozzle center earlier, cool down shower nozzle all around and improve the cooling effect. However, the arrangement of the water diversion structure may increase resistance loss, and the cooling effect around the spray head may be affected.

Patent CN201828156U introduces "water-cooling structure steelmaking furnace oxygen lance nozzle", reforms transform at the water-cooling runner of oxygen lance nozzle, and the cooperation inner tube outer wall sets up accuse class lug, makes the flow of cooling water keep great velocity of flow, avoids phenomenons such as deceleration zone and backward flow region to take place. But such a configuration may be suitable for a single orifice showerhead.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an efficient cooling structure of a large-diameter oxygen lance nozzle. The other path of cooling water is used for cooling the edge part area of the end surface of the spray head and the outer wall of the oxygen lance, and the flow rates of the two paths of water inlet can be independently controlled without mutual interference, so that the cooling efficiency of the spray head of the oxygen lance is improved, and the service life of the oxygen lance is prolonged.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an efficient cooling structure of a large-diameter oxygen lance nozzle is provided with two water inlet channels from inside to outside, and the two water inlet channels are communicated with a water outlet.

Including water conservancy diversion mouth, oxygen orifice, water conservancy diversion island, upward guide plate, circular arc guide plate, circular cone diversion dish, inner tube, well pipe, outer tube down, inner tube, upward guide plate, circular arc guide plate and guide plate are even as an organic whole down, well pipe and water conservancy diversion island are even as an organic whole, the water conservancy diversion island is at last guide plate under with between the guide plate, inner tube, upward guide plate, circular arc guide plate and oxygen lance shower nozzle innermost cavity that lower guide plate constitutes be 1# water inlet channel, well pipe, water conservancy diversion island and inner tube, oxygen orifice, upward guide plate, circular arc guide plate and form 2# water inlet channel between the guide plate down, be out water channel between outer tube and the well pipe.

The large-diameter oxygen lance nozzle refers to an oxygen lance nozzle with the outer diameter specification of over 355 mm.

The included angle a between the lower guide plate and the axis of the guide island is 2-5 degrees.

The end part of the lower guide plate is provided with a guide nozzle with an inclined plane, and the axial included angle b between the lower guide plate and the guide nozzle is 40-45 degrees.

The center of the bottom of the inner cavity of the oxygen lance nozzle is provided with a conical water diversion disc which is of a convex structure, and the included angle of the vertex of the cone is 120 degrees.

The tail end of the flow guide island is of a circular arc structure.

Compared with the prior art, the utility model has the beneficial effects that:

on the basis of the common specification and size of the existing large-caliber oxygen lance nozzle, the utility model changes three layers of sleeves into four layers of sleeves, the mode of 1 inlet and 1 outlet is changed into the mode of 2 inlet and 1 outlet, 2 water inlet channels are mutually independent, and the independent control on the cooling of the center and edge regions of the oxygen lance nozzle can be realized. The cooling structure and the cooling method can be applied to the large-caliber oxygen lance nozzle in steel-making production. The concrete advantages are that:

1) the utility model changes the existing three-layer sleeve into four-layer sleeve, the cooling area of the large-caliber oxygen lance nozzle is changed from 2 layers of compartments into 3 layers of compartments, the space of each compartment is reduced, and the resistance loss condition of cooling water is generally considered when the sleeve structure is designed, so that the water cooling flow rate in the compartments can be improved under the condition of the same inlet water flow.

2) 2 independent water inlet channels are arranged to respectively perform intensive cooling on vulnerable parts such as the center area of the oxygen lance nozzle and the edge area of the oxygen lance nozzle, so that the traditional cooling method of firstly cooling the center of the nozzle and then cooling the edge is changed, the heat of the nozzle is taken away under the condition of lower cooling water temperature, and the heat exchange efficiency is improved.

Drawings

FIG. 1 is an axial schematic view of a lance tip.

FIG. 2 is a schematic view of a half section of a lance tip.

FIG. 3 is a schematic diagram of the water inlet and return of the oxygen lance wall.

In the figure: the water inlet device comprises a 1-1# water inlet channel, a 2-2# water inlet channel, a 3-water outlet channel, a 4-flow guide nozzle, a 5-oxygen spray hole, a 6-flow guide island, a 7-upper flow guide plate, a 8-lower flow guide plate, a 9-arc flow guide plate, a 10-conical water distribution disc, an 11-inner pipe, a 12-middle pipe, a 13-outer pipe, a 14-1# water inlet, a 15-2# water inlet and a 16-water outlet.

Detailed Description

The following embodiments are further illustrated by reference to the following specific examples:

referring to fig. 1-3, the efficient cooling structure of the large-caliber oxygen lance nozzle is provided with two water inlet channels from inside to outside, wherein the two water inlet channels are independently controlled and are communicated with a water outlet.

The oxygen lance nozzle comprises a flow guide nozzle 4, an oxygen spray hole 5, a flow guide island 6, an upper flow guide plate 7, a lower flow guide plate 8, an arc flow guide plate 9, a conical water distribution disc 10, an inner pipe 11, a middle pipe 12 and an outer pipe 13, wherein the inner pipe 11, the upper flow guide plate 7, the arc flow guide plate 9 and the lower flow guide plate 8 are connected into a whole, the middle pipe 12 and the flow guide island 6 are connected into a whole, the flow guide island 6 is arranged between the upper flow guide plate 7 and the lower flow guide plate 8, the innermost cavity of the oxygen lance nozzle formed by the inner pipe 11, the upper flow guide plate 7, the arc flow guide plate 9 and the lower flow guide plate 8 is a No. 1 water inlet channel, a No. 2 water inlet channel is formed between the middle pipe 12, the flow guide island 6 and the inner pipe 11, the oxygen spray hole 5, the upper flow guide plate 7, the arc flow guide plate 9 and the lower flow guide plate 8, and a water outlet channel 3 is formed between the outer pipe 13 and the middle pipe 12. The No. 1 water inlet channel is specially used for cooling the central area of the lower part of the oxygen lance nozzle, and the No. 2 water inlet channel is specially used for cooling the edge area of the end surface of the nozzle and the outer wall of the oxygen lance.

The included angle a between the lower guide plate 8 and the axis of the guide island 6 is 2-5 degrees.

The end of the diversion island 6 is provided with a diversion nozzle 4 with an inclined plane, and the axial included angle b between the lower diversion plate 8 and the diversion nozzle 4 is 40-45 degrees.

The center of the bottom of the inner cavity of the oxygen lance nozzle is provided with a conical water diversion disc 10 which is of a convex structure, and the included angle of the vertex of the cone is 120 degrees.

The tail end of the flow guide island 6 is of an arc-shaped structure, and a curved cooling water channel is formed by the flow guide island and the arc-shaped flow guide plate 9.

The cooling water enters the cooling flow channel from the No. 1 water inlet 14 and the No. 2 water inlet 15 respectively, and the cooling water passing through the No. 1 water inlet channel 1 directly cools the central area of the end face of the spray head and then flows to the edge of the end face of the spray head. The cooling water passing through the No. 2 water inlet channel 2 changes the flow direction through the flow guide island 6, converges with the cooling water of the No. 1 water inlet channel 1 at the edge of the end face of the spray head, and then cools the outer wall of the oxygen lance through the water outlet channel 3, and finally passes through the water outlet 6.

A cooling method of an efficient cooling structure of a large-diameter oxygen lance nozzle comprises the following steps:

different from the cooling mode of 1 inlet and 1 outlet of a common oxygen lance nozzle, the cooling mode of 2 inlet and 1 outlet is adopted, the two water inlet channels are mutually independent, and the cooling water flow of the 1# water inlet channel 1 is 1.1-1.2 times of that of the 2# water inlet channel 2;

the effective cross-sectional area of the No. 1 water inlet channel 1 is gradually reduced, the flow velocity of cooling water is gradually accelerated, after the diversion acceleration of the arc diversion plate 9 and the conical diversion plate 10, the larger the radius is, the larger the linear velocity is, the maximum flow velocity of the cooling water region when the cooling water is contacted with the lower part of the oxygen lance spray head is reached, the average flow velocity is 8-10m/s, the local maximum flow velocity is not more than 15m/s, and the cooling water is converged with the cooling water of the No. 2 water inlet channel 2 at the upper part of the diversion nozzle 4 and then enters the water outlet channel 3;

the effective cross-sectional area of the No. 2 water inlet channel 2 is gradually increased, and when the effective cross-sectional area reaches the upstream of the diversion island 6, the flow speed of cooling water is controlled to be reduced to 3-5m/s, so that the local resistance loss of the cooling water when the flow direction of the cooling water passes through the diversion island 6 is changed is small;

in the upper area of the flow guide nozzle 4, the included angle of the central axes of the flow directions of the No. 1 water inlet channel 1 and the No. 2 water inlet channel 2 is controlled within 40 degrees, the two channels do not generate large resistance loss when converging, the converged cooling water is used for cooling the outer wall, the average flow speed is controlled to be about 6-7m/s, and then the cooling water is discharged through the water outlet 16.

Claims

1. A high-efficiency cooling structure of a large-diameter oxygen lance nozzle is characterized in that two water inlet channels are arranged from inside to outside, and the two water inlet channels are communicated with a water outlet;

the cooling structure comprises a flow guide nozzle, an oxygen spray hole, a flow guide island, an upper flow guide plate, a lower flow guide plate, an arc flow guide plate, a conical water diversion disc, an inner pipe, a middle pipe and an outer pipe, wherein the inner pipe, the upper flow guide plate, the arc flow guide plate and the lower flow guide plate are connected into a whole, the middle pipe and the flow guide island are connected into a whole, the flow guide island is arranged between the upper flow guide plate and the lower flow guide plate, the innermost cavity of the oxygen lance spray nozzle formed by the inner pipe, the upper flow guide plate, the arc flow guide plate and the lower flow guide plate is a No. 1 water inlet channel, a No. 2 water inlet channel is formed between the middle pipe, the flow guide island and the inner pipe, the oxygen spray hole, the upper flow guide plate, the arc flow guide plate and the lower flow guide plate, and a water outlet channel is formed between the outer pipe and the middle pipe.

2. The efficient cooling structure for a large-caliber oxygen lance nozzle according to claim 1, wherein the large-caliber oxygen lance nozzle refers to an oxygen lance nozzle with a nozzle outer diameter specification of more than 355 mm.

3. The efficient cooling structure for a large-caliber oxygen lance nozzle according to claim 1, wherein an included angle a between the lower guide plate and the axis of the flow guide island is 2-5 degrees.

4. The efficient cooling structure for a large-caliber oxygen lance nozzle according to claim 1, wherein the end of the lower guide plate is provided with an inclined guide nozzle, and the included angle b between the lower guide plate and the axis of the guide nozzle is 40-45 °.

5. The efficient cooling structure for the large-diameter oxygen lance nozzle according to claim 1, wherein a conical water diversion disc is arranged at the center of the bottom of the inner cavity of the oxygen lance nozzle, the conical water diversion disc is of a convex structure, and the included angle of the vertex of the cone is 120 degrees.

6. The efficient cooling structure of the large-caliber oxygen lance nozzle according to claim 1, wherein the tail end of the flow guide island is of a circular arc structure.