Stagnation pressure measuring device and method of oxygen lance system

A technology of stagnation pressure and measuring device, which is applied in the field of stagnation pressure measurement device of oxygen lance system, can solve the problems of unknown design requirements and the stagnation pressure of nozzles cannot be directly measured, and achieves the effect of optimizing the system and improving economic and technical indicators.

Pending Publication Date: 2019-08-16
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are as follows: In actual conditions, due to the constraints of conditions, the stagnation pressure in front of the nozzle cannot be directly measured. During smelting, the pressure P at the pressure point near the quick shut-off valve is used for operation control. Due to the pressure loss of the system and the oxygen The influence of flow rate, in different pressure ranges, whether the stagnation pressure P at the nozzle inlet at the end of the oxygen lance meets the design requirements is unknown

Method used

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  • Stagnation pressure measuring device and method of oxygen lance system
  • Stagnation pressure measuring device and method of oxygen lance system
  • Stagnation pressure measuring device and method of oxygen lance system

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Embodiment 1

[0027] From figure 1 It can be seen that a stagnation pressure measurement device for an oxygen lance system in this embodiment includes an oxygen main pipe 1, the output end of the oxygen main pipe 1 is connected with an oxygen branch pipe 12, and the pipeline of the oxygen branch pipe 12 is sequentially provided with a regulating valve 5, a fast Shut-off valve 6 and pressure-taking point 4, pressure-taking point 4 is connected with branch pipe pressure transmitter 2, one end of branch pipe pressure transmitter 2 is connected with branch pipe pressure gauge 3, and the output end of oxygen branch pipe 12 is connected with oxygen The hose 7, the regulating valve 5 on the oxygen main pipe 1 and the oxygen branch pipe 12, the quick cut-off valve 6 and the oxygen hose 7 are connected in series in sequence. The lance end 9 and the oxygen lance end 9 are equipped with an equivalent throat 11. The equivalent throat 11 is composed of a cylindrical body 111 and a conical constriction s...

specific Embodiment

[0038] Specific examples are as follows, select 300 tons converter oxygen lance system,

[0039] Oxygen lance 8 has an outer diameter of 355.6mm, a throat diameter of 47.0mm, 6 holes, a Mach number of 2.05, a design stagnation pressure of P0=0.8572MPa, an inner tube 81 of the oxygen lance with an inner and outer diameter of 220mm and 236mm, and a cylinder body 111, The outer diameter is determined according to the inner tube 81 of the oxygen lance, Ф1=Ф3=220mm, Ф2=Ф4=236mm; the diameter Ф6 of the outlet 113 is calculated and determined according to the parameters of the oxygen lance 8 nozzle through the formula: Ф6=2×(A / π) 1 / 2 =2×(6×47×47 / 4×π / π) 1 / 2 =115mm; the height L4 of the tapered constriction section 112 is 84mm; the thickness t2 is 12mm; the total length L1 of the equivalent throat 11 is 350mm; Port 11 is made of Q235.

[0040] Measure the stagnation pressure P0 at the pressure-taking hole 114 through the standard pressure gauge 10, measure the pressure P1 at the pres...

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Abstract

The invention discloses a stagnation pressure measuring device and method of an oxygen lance system and belongs to the technical field of steel smelting. The stagnation pressure measuring device comprises an oxygen main pipe which is connected with an oxygen branch pipe. A pressure taking point is arranged on the oxygen branch pipe. The output end of the oxygen branch pipe is connected with an oxygen soft pipe, and the output end of the oxygen soft pipe is connected with an oxygen lance. One end of the oxygen lance is an oxygen lance end portion, and an equivalent throat is installed at the end portion of the oxygen lance. The equivalent throat is composed of a cylinder barrel and a conical contraction section, a pressure taking hole is formed in the side wall of the cylinder barrel, and the pressure taking hole is connected with a standard pressure gauge through a pipeline. By means of the stagnation pressure measuring device and method, the relation between the pressure of the pressure taking point and the stagnation pressure before a spraying head is determined based on pipeline pressure loss measurement and according to the calculation of corresponding spraying head parametersand work conditions, a basis is provided for correcting the design of the oxygen lance spray head and determining the operation pressure of the oxygen lance, the oxygen supply and slag making system is optimized, and economic and technical indexes are improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, and more specifically relates to a device and method for measuring stagnation pressure of an oxygen lance system. Background technique [0002] Oxygen supply to the top of the converter is the main steelmaking method in the world today. Oxygen supply and slagging is one of the core technologies of converter smelting. The rational design and application of the oxygen lance nozzle is an important basis for it. In oxygen top-blown converter steelmaking, the oxygen lance oxygen supply system is composed of oxygen main pipe, branch pipe pressure transmitter, branch pipe pressure gauge, pressure point, regulating valve, quick shut-off valve, oxygen hose, oxygen lance, etc. The oxygen lance The nozzle is welded and installed at the end of the oxygen lance. After the throat area of ​​the nozzle is determined, the oxygen flow is controlled by the pressure P at the pressure point near the q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46
CPCC21C5/4606C21C5/4673
Inventor 徐小伟徐葆春单永刚邬琼熊磊
Owner MAANSHAN IRON & STEEL CO LTD
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