CN215713117U - Phi 245 large-flow oxygen lance nozzle - Google Patents
Phi 245 large-flow oxygen lance nozzle Download PDFInfo
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- CN215713117U CN215713117U CN202121957521.8U CN202121957521U CN215713117U CN 215713117 U CN215713117 U CN 215713117U CN 202121957521 U CN202121957521 U CN 202121957521U CN 215713117 U CN215713117 U CN 215713117U
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- oxygen
- pipe
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- blowing
- outlet
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- 239000001301 oxygen Substances 0.000 title claims abstract description 100
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 100
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000007664 blowing Methods 0.000 claims abstract description 30
- 238000003723 Smelting Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000033764 rhythmic process Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The utility model relates to a phi 245 high-flow oxygen lance nozzle. The phi 245 high-flow oxygen lance nozzle comprises an inner pipe, a middle layer pipe and an outer pipe, wherein an oxygen flow dividing body is mounted at the lower end of the inner pipe, is fixedly connected with an oxygen blowing conical pipe on a nozzle crown, and is communicated with an inner cavity; the nozzle crown is fixedly connected with the lower end part of the outer pipe; the top of the oxygen blowing conical pipe is a throat opening, and the diameter D of the throat opening is 36.7mm; the top of the oxygen blowing conical pipe is an outlet, and the diameter D of the outlet is 49.4mm; such parameters as the throat opening of the oxygen lance nozzle are optimally designed, so that the oxygen supply flow in the smelting process is increased, the blowing time is shortened, and the smelting rhythm is accelerated; and the design can be suitable for complex furnace condition environments of converter smelting, meets the production process requirements, and has no influence on normal operation of other surrounding equipment.
Description
Technical Field
The utility model relates to an oxygen lance nozzle, in particular to a phi 245 large-flow oxygen lance nozzle.
Background
The oxygen lance is one of the main process devices in oxygen converter steelmaking, and the performance characteristics of the oxygen lance directly influence the smelting effect and the blowing time, thereby influencing the quality and the yield of steel. The oxygen lance body consists of three concentric circular pipes, the oxygen lance tail with oxygen supply and water discharge passages and a spray head for spraying oxygen are connected into a whole to form the hollow tubular oxygen lance, for the converter oxygen lance, an inner pipe is a passage for oxygen, and oxygen flows through the inner pipe from an oxygen supply pipe at the tail of the lance and is blown into a metal molten pool through the spray head; the oxygen gun cooling water enters the gun body from the gun tail water inlet branch pipe through an annular passage between the outer pipe, the middle pipe and the inner pipe, descends to the spray head guide water diversion plate, is collected in the cavity, rapidly flows through the surface in the spray head end face cavity, turns 180 degrees, enters the outer pipe gap, and flows out through the gun ejection water pipe.
As shown in fig. 2, when the conventional phi 245 x 4 type oxygen lance is used for smelting, under the condition of a certain oxygen pressure, the oxygen flow is small, the stirring depth is insufficient in the smelting process, the oxygen utilization rate is low, and the blowing time is long.
In conclusion, how to increase the flow rate of the oxygen lance becomes a problem which needs to be solved urgently by researchers in the field.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: how to improve the flow of the oxygen lance;
in order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model relates to a phi 245 large-flow oxygen lance nozzle, which comprises: the oxygen-blowing oxygen-blowing oxygen-blowing oxygen blowing; the top of the oxygen blowing taper pipe is a throat, and the diameter D throat of the oxygen blowing taper pipe is 36.7 mm; the top of the oxygen blowing taper pipe is an outlet, and the diameter D of the oxygen blowing taper pipe is 49.4 mm;
in the scheme, compared with the traditional phi 245 x 4 type oxygen lance, the device enlarges the area of the throat and the outlet, thereby improving the flow of the oxygen lance.
In order to further improve the flow of the oxygen lance, the inclination angle from the throat to the outlet is 8.75 degrees; the total length L of the oxygen blowing taper pipe is 83 mm;
in the scheme, the inclination angle from the throat to the outlet is improved, and the distance between the throat and the outlet is shortened, so that the flow of the oxygen lance is improved.
The utility model has the beneficial effects that: the utility model is a phi 245 large-flow oxygen lance nozzle, and optimizes the design of parameters such as the throat of the oxygen lance nozzle, increases the oxygen supply flow in the smelting process, shortens the blowing time and improves the smelting rhythm; the design can be suitable for the complex furnace condition environment of converter smelting, meets the production process requirements, and does not influence the normal operation of other surrounding equipment.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a conventional phi 245 lance tip;
in the figure: 1-nozzle crown, 2-outer tube, 3-middle layer tube, 4-inner tube, 5-oxygen blowing taper tube, 6-throat and 7-outlet.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in figure 1, the utility model relates to a phi 245 high-flow oxygen lance nozzle, which comprises: the oxygen spraying device comprises an inner pipe 4, a middle-layer pipe 3 and an outer pipe 2, wherein the lower end of the inner pipe 4 is provided with an oxygen distribution body, the oxygen distribution body is fixedly connected with an oxygen blowing taper pipe 5 on a spray head crown 1, the inner cavity of the oxygen distribution body is communicated, and the spray head crown 1 is fixedly connected with the lower end part of the outer pipe 2; the top of the oxygen blowing taper pipe 5 is a throat 6, and the diameter D throat is 36.7 mm; the top of the oxygen blowing cone is an outlet 7, the diameter D of which is 49.4 mm.
As shown in fig. 1, the angle of inclination from throat 6 to outlet 7 is 8.75 °; the length L of the expanding section of the oxygen blowing taper pipe 5 is 83 mm.
To illustrate the diameter design of the throat and the outlet, specifically:
1. mach number selection
An important dimensionless parameter in fluid mechanics that characterizes the degree of fluid compressibility is defined as the ratio of the velocity v at a certain point in the flow field to the local speed of sound c at that point, i.e., -v/c, and in a compressible flow, the relationship between the relative change in gas flow velocity dv/v and the relative change in density is dp/ρ -2dv/v, i.e., the greater the mach number, the greater the compressibility the gas exhibits. In addition, when the mach number is greater than or less than 1, the propagation condition of the disturbance in the airflow is also greatly different. Thus, from an aerodynamic point of view, mach number ratio flow velocities are better indicative of flow characteristics. According to the Mach number, the gas flow can be divided into different types, such as low-speed flow, subsonic flow, transonic flow, supersonic flow and hypersonic flow.
The mach number is the ratio of the airflow velocity to the sonic velocity at local temperature conditions:
M＝U/a；
in the formula: u is the air flow speed m/s;
a is the speed of sound in m/s at the local temperature.
The oxygen supply pressure of the oxygen lance is determined by the Mach number of the outlet of the spray head, and the pressure energy of the oxygen is converted into kinetic energy to obtain the supersonic oxygen flow. Production practice proves that not only splashing and serious lining erosion are achieved by adopting overhigh designed oxygen pressure, but also good stirring of a molten pool cannot be achieved by adopting overlow designed oxygen pressure and overlow oxygen outlet speed.
In view of improving the impact capability of the oxygen jet, it is desirable to use a higher mach number, and after M >2.0, as the hz increases, the temperature of the oxygen outlet decreases, the sonic velocity of the outlet decreases, the outlet velocity increases slowly, and the pressure increases rapidly under the design condition. An excessively high mach number requires high-pressure pipeline facilities, so that the relative investment is large, the reaction is violent, and the operation difficulty is large; when the Mach number is too small, the oxygen pressure in the oxygen feed line is not sufficiently utilized, and it is not economical.
Comprehensively considering: the mach number was chosen to be 2.08.
2. Calculating the oxygen pressure Po of the working condition
Looking up an entropy flow table, when M is 2.08, P out/Po is 0.1128, and since the furnace pressure is similar to the atmospheric pressure, P out is 0.102MPa, and Po is 0.9MPa is 9.18 Kg/f.
The pressure after the valve is recommended to be between 0.9 and 0.92MPa, preferably between 0.92MPa, if the operating oxygen pressure is higher than the design oxygen pressure, part of pressure energy of the oxygen flow is still not converted into kinetic energy, the oxygen flow continues to expand after leaving the jet orifice, and the jet flow generates shock waves, so that the oxygen flow is unstable, the energy loss is large, the slag melting is not good, the splashing is increased, and the blowing is not facilitated; if the operating oxygen pressure is too low, the attenuation of the outlet oxygen jet flow is fast, the stirring of a molten pool is weakened, the utilization rate of oxygen is reduced, the converting time is prolonged, and the production efficiency is reduced.
Considering that the pressure loss of the pipeline is generally slightly higher than the stagnation pressure of the throat, the oxygen pressure is avoided to be lower than 0.78Mpa, so as to prevent the occurrence of the oxygen gun backfire accident.
3. Calculating oxygen flow Q
The oxygen lance flow Q is the amount of oxygen supplied to the molten pool in unit time, and the amount of the oxygen supplied to the molten pool is m3/h or m 3/min; the oxygen consumption of steel per ton is multiplied by the tapping quantity multiplied by 60/pure oxygen supply time;
to obtain: q24969 m3/hr (based on field operating conditions);
the flow rate is the flow rate of oxygen under a set working condition, and when the pressure of the oxygen is changed, the flow rate of the oxygen is changed along with the change of the pressure of the oxygen, and the oxygen is required to be normal.
4. Calculating diameter of throat opening D throat
Selecting four-hole spray heads according to the tonnage of the furnace and the practice, and using an oxygen flow formula Q which is 64.3236 multiplied by Po multiplied by A throat;
po is the application pressure MPa;
throat-laryngeal cross sectional area;
q is the oxygen flow Nm3/hr
To obtain: throat is 36.7 mm.
5. Calculating the diameter of the outlet D
According to M2.08, checking an isentropic flow table, wherein A out/A throat is 1.806;
a outlet-outlet cross sectional area;
throat-laryngeal cross sectional area;
to obtain: d out is 49.4 mm.
6. Calculating the length L of the dilated segment
The theoretical gas expansion angle is 4-8 degrees, and the flare angle of the expansion section is also designed to be 4-8 degrees. The small expansion angle has the function of controlling expansion, so that the outlet stream slightly expands, and laminar flow can appear when the oxygen stream flows close to the hole wall, thereby aggravating the mixing of the jet flow surface and the furnace oxygen and being beneficial to improving the heat efficiency. The large expansion angle has small expansion control effect, the expansion section is short, the influence of the roughness of the hole wall is small, the reduction of the energy loss of oxygen jet flow is facilitated, the penetration force of an acting molten pool is improved, the loading depth of a new furnace is deep, the penetration capacity of a nozzle is considered, a large opening angle is required, and the degree is determined to be 8.75 degrees.
Then, L is (49.4-36.7)/2 Xtan (8.75/2) ° 83 mm.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A phi 245 high-flow oxygen lance nozzle is characterized by comprising: the oxygen-blowing oxygen-distributing device comprises an inner pipe, a middle-layer pipe and an outer pipe, wherein the lower end of the inner pipe is provided with an oxygen distributing body, the oxygen distributing body is fixedly connected with an oxygen-blowing taper pipe on a nozzle crown, the inner cavity of the oxygen distributing body is communicated with the inner cavity of the oxygen-blowing taper pipe, and the nozzle crown is fixedly connected with the lower end of the outer pipe;
the top of the oxygen blowing taper pipe is a throat, and the diameter D throat of the oxygen blowing taper pipe is 36.7 mm;
the top of the oxygen blowing taper pipe is an outlet, and the diameter D outlet of the oxygen blowing taper pipe is 49.4 mm.
2. The Φ 245 high flow lance tip of claim 1 wherein the angle of inclination of the throat to the outlet is 8.75 °; the length L of the expansion section of the oxygen blowing taper pipe is 83 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121957521.8U CN215713117U (en) | 2021-08-19 | 2021-08-19 | Phi 245 large-flow oxygen lance nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121957521.8U CN215713117U (en) | 2021-08-19 | 2021-08-19 | Phi 245 large-flow oxygen lance nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215713117U true CN215713117U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121957521.8U Active CN215713117U (en) | 2021-08-19 | 2021-08-19 | Phi 245 large-flow oxygen lance nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215713117U (en) |
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2021
- 2021-08-19 CN CN202121957521.8U patent/CN215713117U/en active Active
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