阅读说明：本技术 一种转炉氧枪管道压力损失的测试装置和测试方法 (Device and method for testing pressure loss of converter oxygen lance pipeline ) 是由 崔怀周 王杰 吴伟 汪成义 赵进宣 杨利彬 于 2020-09-23 设计创作，主要内容包括：一种转炉氧枪管道压力损失的测试装置和测试方法,属于转炉炼钢技术领域。包括当量喉口喷头、导压管、固定装置、引压管及气体压力表。导压管呈“L”型,垂直部分位于当量喉口喷头9的中心位置,水平部分端头镶嵌于当量喉口喷头圆筒状部分侧壁并延伸至外壁,与固定装置相连接；固定装置固定于当量喉口喷头外侧,并与导压管及引压管相连接,引压管一端与固定装置相连接,并与导压管内腔相通,另一端连接气体压力表。优点在于,克服了转炉生产中氧枪管道压力损失无法确定的难题,以冷态下用测试的方法测试不同氧流量条件下氧枪喷头处的滞止压力,为正确设计氧枪喷头参数及准确制定转炉氧枪操作工艺提供参考。(A device and a method for testing pressure loss of a converter oxygen lance pipeline belong to the technical field of converter steelmaking. Comprises an equivalent throat nozzle, a pressure guide pipe, a fixing device, a pressure guide pipe and a gas pressure gauge. The pressure guide pipe is L-shaped, the vertical part is positioned at the central position of the equivalent throat nozzle 9, and the end head of the horizontal part is embedded in the side wall of the cylindrical part of the equivalent throat nozzle, extends to the outer wall and is connected with the fixing device; the fixing device is fixed on the outer side of the equivalent throat nozzle and is connected with the pressure guide pipe and the pressure guide pipe, one end of the pressure guide pipe is connected with the fixing device and is communicated with the inner cavity of the pressure guide pipe, and the other end of the pressure guide pipe is connected with the gas pressure gauge. The method has the advantages that the problem that the pressure loss of the oxygen lance pipeline cannot be determined in the production of the converter is solved, the stagnation pressure at the oxygen lance nozzle under different oxygen flow conditions is tested by using a test method under a cold state, and reference is provided for correctly designing the parameters of the oxygen lance nozzle and accurately formulating the operation process of the converter oxygen lance.)

1. A device for testing the pressure loss of a converter oxygen lance pipeline is characterized by comprising an equivalent throat nozzle (9), a pressure guide pipe (91), a fixing device (92), a pressure guide pipe (93) and a gas pressure gauge (10);

the pressure guide pipe (91) is L-shaped, the vertical part is positioned at the central position of the equivalent throat nozzle (9), the end of the horizontal part is embedded in the equivalent throat nozzle, and the side wall of the cylindrical part of the equivalent throat nozzle (9) extends to the outer wall and is connected with the fixing device (92);

the fixing device (92) is fixed outside the equivalent throat nozzle and is connected with the pressure guide pipe (91) and the pressure guide pipe (93),

one end of the pressure guiding pipe (93) is connected with the fixing device (92) and is communicated with the inner cavity of the pressure guiding pipe (91), and the other end is connected with the gas pressure gauge (10).

The equivalent throat nozzle (9) is made of plain carbon steel, the upper part of the equivalent throat nozzle is cylindrical, and the lower part of the equivalent throat nozzle is funnel-shaped. The inner diameter of the cylindrical part is the same as that of the inner pipe of the oxygen lance, the inner diameter of the upper end of the funnel-shaped part is the same as that of the cylindrical part at the inner diameter of the outlet, the inner diameter of the lower end of the funnel-shaped part is determined by the diameter and the number of holes of the throat of the oxygen lance nozzle, and the area of the inner cavity at the outlet of the lower end of the equivalent throat nozzle (9.

2. The device for testing the pressure loss of the oxygen lance pipeline of the converter according to claim 1, wherein the wall thickness of the cylindrical part at the upper part of the equivalent throat nozzle (9) is 1.5-3 mm, and the top end of the upper part is provided with a chamfer of 45 degrees; the included angle between the slope of the funnel-shaped part at the lower part and the vertical direction is 15-30 degrees; the bottom end of the funnel-shaped part at the lower part is in a straight cylinder shape, and the height of the straight cylinder shape is 3-6 mm.

3. The device for testing the pressure loss of the converter oxygen lance pipeline according to the claim 1, characterized in that the pressure guiding pipe (91) is processed by a stainless steel pipe, the inner diameter is 2-5 mm, and the wall thickness is 1-2 mm; the pressure guide pipe (91) is rigidly connected with the fixing device (92) and can bear the impact of gas pressure of 1-2 MPa;

a through hole is arranged in the fixing device (92) to keep the pressure guide pipe (91) communicated with the inner cavity of the pressure guide pipe (93);

the pressure guiding pipe (93) is a metal hose, the inner diameter is 2-5 mm, the wall thickness is 1-2 mm, and the length is larger than or equal to 15 m.

4. The device for testing the pressure loss of the converter oxygen lance pipeline according to the claim 1, wherein the gas pressure gauge (10) is a standard gas pressure gauge, and the maximum measuring range is 1.5-5 MPa.

5. The device for testing the pressure loss of the oxygen lance pipeline of the converter according to claim 1, wherein the equivalent throat nozzle (9) is hermetically connected with the fixing device (92), the pressure guiding pipe (91) is hermetically connected with the fixing device 2, the fixing device (92) is hermetically connected with the pressure guiding pipe 92, and the pressure guiding pipe (93) is hermetically connected with the gas pressure gauge (10).

6. A method for testing pressure loss of a converter oxygen lance pipeline is characterized by comprising the following steps:

(1) installing a pressure guide pipe (91) and a fixing device (92) to an equivalent throat nozzle (9), replacing an oxygen lance nozzle with the equivalent throat nozzle (9), installing the equivalent throat nozzle and the fixing device on an inner pipe of an oxygen lance for testing, and ensuring the sealing property;

(2) hoisting an oxygen lance for measurement to a standby position and connecting the oxygen lance with an oxygen pipeline;

(3) moving an oxygen gun for measurement to a working position and putting the oxygen gun down to a nitrogen sealing port of the converter; one end of a pressure guiding pipe (93) is connected with a fixing device (92), and the other end is connected with a gas pressure gauge (10) and keeps the sealing property; a gas pressure gauge (10) is arranged at a position which is far away from the oxygen lance and is easy to observe;

(4) lowering the lower end of the oxygen lance for testing to be about 100mm in the nitrogen seal, and starting oxygen to test oxygen so as to check whether the signal of the whole measuring system is normal;

(5) adjusting the oxygen flow, and recording a working pressure value and a stagnation pressure value simultaneously after the oxygen flow and the pressure are stable;

(6) adjusting the oxygen flow from small to large or from large to small, repeating the step (5), and measuring more than five groups of data;

(7) and (4) arranging data, obtaining a working pressure fitting curve and a stagnation pressure fitting curve according to the measured data, and calculating the pressure loss of the pipeline under different working pressures.

7. The method for testing the pressure loss of an oxygen lance pipeline of a converter according to claim 6, wherein no molten steel and liquid slag are contained in the converter during the test, and no open fire or fire source exists in the surrounding 10m of the test device; during testing, the oxygen lance cooling water pipe is not connected or water is not connected.

8. The method for testing the pressure loss of the oxygen lance pipeline of the converter according to claim 6, wherein a smoke hood is shaken out from a converter mouth during the test, and a converter fan system, a dust removal system and a nitrogen sealing system are in an operating state.

Technical Field

The invention belongs to the technical field of converter steelmaking, and particularly relates to a device and a method for testing pressure loss of a converter oxygen lance pipeline.

Background

In the process of converter steelmaking, the oxygen lance can achieve the purposes of decarburization, desiliconization, dephosphorization, temperature increase and the like by blowing oxygen to molten iron and steel slag, and the oxygen pressure is an important parameter for ensuring the oxygen blowing effect. Under the actual production condition, because of the limitation of high-temperature environment and equipment space, the pressure gauge cannot be arranged at the position of the oxygen lance nozzle, so that the stagnation pressure in front of the nozzle is difficult to directly measure. Generally, a pressure measuring point of a pressure gauge is arranged at a certain position of an oxygen pipeline in a production site, and oxygen flow needs to flow through the oxygen pipeline with a certain length, an oxygen hose and an oxygen inner pipe after the pressure measuring point to reach an oxygen lance nozzle to be sprayed into a furnace. In the process, the oxygen flow rubs against the pipe wall when flowing in the pipeline, and the loss of oxygen pressure is caused by the flow change caused by factors such as obstacles in the pipeline, sudden change of the section in the pipeline and the like. Therefore, the relationship between the operating pressure of the control chamber and the forward stagnation pressure of the lance head must be determined by measuring the pressure loss of the pipeline, so that the real stagnation pressure at the lance head under different operating pressures can be known, and a basis is provided for correctly designing the lance head and determining the operating process of the lance.

At present, for the pressure loss of an oxygen lance pipeline, the accuracy of the design of the oxygen lance nozzle and the operation process of the oxygen lance of the converter is greatly influenced by estimation when the nozzle is designed in an oxygen lance nozzle plant and the operation process of the oxygen lance of the converter is formulated by steel enterprises, and the smelting effect and the smelting quality of the converter are further influenced.

Disclosure of Invention

The invention aims to provide a device and a method for testing the pressure loss of an oxygen lance pipeline of a converter, which overcome the problem that the pressure loss of the oxygen lance pipeline cannot be determined in the production of the converter. The stagnation pressure of oxygen at the lance nozzle can be tested to calculate the pressure loss of oxygen flow in the lance pipe. Replacing an equivalent throat nozzle with an equivalent throat nozzle at the bottom end of the oxygen lance for smelting, forming a hole on the side surface of the equivalent throat nozzle, connecting a hollow metal wire between a pressure gauge and the hole, adjusting the oxygen flow rate in a cold state, and simultaneously reading a pressure taking point of the oxygen lance and the pressure gauge at the equivalent throat nozzle, thereby measuring stagnation pressure at the oxygen lance nozzle under different oxygen flow rates and further calculating the pipeline pressure loss of the converter oxygen lance. Provides reference for correctly designing the parameters of the oxygen lance nozzle and accurately formulating the operation process of the oxygen lance of the converter, thereby improving the smelting effect and the smelting quality of the converter.

The testing device comprises an equivalent throat nozzle 9, a pressure guide pipe 91, a fixing device 92, a pressure guide pipe 93 and a gas pressure gauge 10.

The pressure pipe 91 is L-shaped, the vertical part is positioned at the center of the equivalent throat nozzle 9, and the end of the horizontal part is embedded in the side wall of the cylindrical part of the equivalent throat nozzle 9 and extends to the outer wall to be connected with the fixing device 92;

the fixing device 92 is fixed outside the equivalent throat nozzle and connected with the pressure guide pipe 91 and the pressure guide pipe 93,

one end of the pressure guiding pipe 93 is connected with the fixing device 92 and is communicated with the inner cavity of the pressure guiding pipe 91, and the other end is connected with the gas pressure gauge 10.

The equivalent throat nozzle 9 is made of plain carbon steel, the upper part of the equivalent throat nozzle is cylindrical, and the lower part of the equivalent throat nozzle is funnel-shaped. The inner diameter of the cylindrical part is the same as that of the inner pipe of the oxygen lance, the inner diameter of the upper end of the funnel-shaped part is the same as that of the cylindrical part at the inner diameter of the outlet, the inner diameter of the lower end is determined by the diameter and the number of holes of the throat of the oxygen lance nozzle, and the area of the inner cavity at the outlet at the lower end of the equivalent throat nozzle is equal to the total;

furthermore, the wall thickness of the upper cylindrical part is 1.5-3 mm, and the top end of the upper part is provided with a 45-degree chamfer;

furthermore, the included angle between the slope of the funnel-shaped part at the lower part and the vertical direction is 15-30 degrees;

furthermore, the bottom end of the funnel-shaped part at the lower part is in a straight cylinder shape, and the height of the straight cylinder shape is 3-6 mm.

The pressure pipe 91 is formed by processing a stainless steel pipe, the inner diameter is 2-5 mm, the wall thickness is 1-2 mm, the pressure pipe is L-shaped, and the vertical part is positioned at the central position of the equivalent throat nozzle. The end of the horizontal part is embedded in the side wall of the cylindrical part of the equivalent throat nozzle and extends to the outer wall, and is connected with the fixing device;

furthermore, the fixing device 92 is fixed outside the equivalent throat nozzle, connected with the pressure guide pipe and the pressure guide pipe, and internally provided with a through hole for keeping the pressure guide pipe communicated with the inner cavity of the pressure guide pipe;

furthermore, the pressure guiding pipe 93 is a metal hose with an inner diameter of 2-5 mm, a wall thickness of 1-2 mm and a length of more than or equal to 15m, one end of the pressure guiding pipe is connected with the fixing device and communicated with the inner cavity of the pressure guiding pipe, and the other end of the pressure guiding pipe is connected with a gas pressure gauge;

further, the gas pressure gauge is a standard gas pressure gauge, and the maximum measuring range is 1.5-5 MPa;

furthermore, the pressure guide pipe 91 is rigidly connected with the fixing device 92, so that the pressure guide pipe can bear the impact of gas pressure of 1-2 MPa;

further, the equivalent throat nozzle 9 and the fixing device 92, the pressure guide pipe 91 and the fixing device 2, the fixing device 92 and the pressure guide pipe 92, and the pressure guide pipe 93 and the gas pressure gauge 10 are hermetically connected.

In addition, the invention also provides a method for testing the pressure loss of the converter oxygen lance pipeline, which comprises the following steps:

step 1: installing a pressure guide pipe and a fixing device to an equivalent throat nozzle, replacing an oxygen lance nozzle with the equivalent throat nozzle, installing the equivalent throat nozzle on an inner pipe of an oxygen lance for testing, and ensuring the sealing property;

step 2: the oxygen lance for measurement is lifted to a standby position and connected with an oxygen pipeline.

And step 3: the oxygen gun was moved to the work station and lowered to the nitrogen seal of the converter. One end of the pressure guiding pipe is connected with the fixing device, and the other end of the pressure guiding pipe is connected with the gas pressure gauge, and the sealing performance is kept. The gas pressure gauge is placed at a position away from the oxygen lance and easy to observe.

And 4, step 4: and (4) lowering the lower end of the oxygen lance for testing to be about 100mm in the nitrogen seal, and starting oxygen to test oxygen so as to check whether the signal of the whole measuring system is normal.

And 5: and adjusting the oxygen flow, and recording a working pressure value (an oxygen pipeline pressure taking point pressure value) and a stagnation pressure value (a gas pressure gauge pressure value) after the oxygen flow and the pressure are stable.

Step 6: adjusting the oxygen flow from small to large or from large to small, repeating the step 5, and measuring more than five groups of data;

and 7: and (4) arranging data, obtaining a working pressure fitting curve and a stagnation pressure fitting curve according to the measured data, and calculating the pressure loss of the pipeline under different working pressures.

Furthermore, during testing, no molten steel and liquid slag charge exist in the converter, and no open fire or fire source exists in the 10m surrounding of the testing device.

Furthermore, the oxygen lance cooling water pipe is not connected or water is not connected during the test.

Further, during testing, the smoke hood is shaken out of the converter mouth, and the converter fan system, the dust removal system and the nitrogen sealing system are in an operating state.

Further, the minimum value of the tested working pressure value should be lower than 3.5 MPa.

The maximum value of the tested working pressure is larger than the maximum value of the oxygen working pressure in the smelting process of the converter, and all the test points are uniformly distributed as far as possible.

The pipeline pressure loss is the difference between the working pressure and the corresponding stagnation pressure.

The invention overcomes the problem that the pressure loss of the oxygen lance pipeline can not be determined in the production of the converter, tests the stagnation pressure at the oxygen lance nozzle under different oxygen flow conditions by using a test method under a cold state, and provides reference for correctly designing the oxygen lance nozzle parameters and accurately formulating the operation process of the converter oxygen lance.

Drawings

FIG. 1 is a schematic view of a system for testing the pressure loss of a converter oxygen lance pipeline according to the present invention. Wherein, the oxygen main pipe 1, the adjusting valve 2, the quick cut-off valve 3, the pressure transmitter 4, the operating room pressure gauge 5, the pressure taking point 6, the oxygen hose 7, the oxygen lance 8, the equivalent throat nozzle 9 and the gas pressure gauge 10.

FIG. 2 is a schematic view of the apparatus for measuring pressure loss of a converter oxygen lance pipe according to the present invention. Wherein, the equivalent throat nozzle 9, the pressure pipe 91, the fixing device 92, the pressure guiding pipe 93 and the gas pressure gauge 10.

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Specifically, the invention provides a device for testing the pressure loss of a converter oxygen lance pipeline, which comprises an equivalent throat nozzle 9, a pressure guide pipe 91, a fixing device 92, a pressure guide pipe 93 and a gas pressure gauge 10, as shown in FIG. 2.

The equivalent throat nozzle is made of plain carbon steel, the upper part of the equivalent throat nozzle is cylindrical, and the lower part of the equivalent throat nozzle is funnel-shaped. The inner diameter of the cylindrical part is the same as that of the inner pipe of the oxygen lance, the inner diameter of the upper end of the funnel-shaped part is the same as that of the cylindrical part at the inner diameter of the outlet, the inner diameter of the lower end is determined by the diameter and the number of holes of the throat of the oxygen lance nozzle, and the area of the inner cavity at the outlet at the lower end of the equivalent throat nozzle is equal to the total;

the wall thickness of the upper cylindrical part is 1.5-3 mm, the top end of the upper part is provided with a 45-degree chamfer, the inclined angle between the slope of the lower funnel-shaped part and the vertical angle is 15-30 degrees, the bottom end of the lower funnel-shaped part is in a straight cylinder shape, and the height of the straight cylinder shape is 3-6 mm;

the testing device also comprises a pressure guide pipe 91, a fixing device 92, a pressure guide pipe 93 and a gas pressure gauge 10;

the pressure pipe 91 is formed by processing a stainless steel pipe, the inner diameter is 2-5 mm, the wall thickness is 1-2 mm, the pressure pipe is L-shaped, and the vertical part is positioned at the central position of the equivalent throat nozzle 9. The end of the horizontal part is embedded in the side wall of the cylindrical part of the equivalent throat nozzle 9, extends to the outer wall and is connected with a fixing device;

the fixing device 92 is fixed on the outer side of the equivalent throat nozzle 9, is connected with the pressure guide pipe 91 and the pressure guide pipe 93, is internally provided with a through hole, and keeps the communication between the pressure guide pipe 91 and the inner cavity of the pressure guide pipe 93;

the pressure guiding pipe 93 is a metal hose, the inner diameter of the pressure guiding pipe is 2-5 mm, the wall thickness of the pressure guiding pipe is 1-2 mm, the length of the pressure guiding pipe is more than or equal to 15m, one end of the pressure guiding pipe is connected with the fixing device 92 and communicated with the inner cavity of the pressure guiding pipe 91, and the other end of the pressure guiding pipe is connected with the gas pressure gauge;

the gas pressure gauge 10 is a standard gas pressure gauge, and the maximum measuring range is 1.5-5 MPa;

the pressure guide pipe 91 is rigidly connected with the fixing device 92, and can bear the impact of gas pressure of 1-2 MPa;

the equivalent throat nozzle 9 is hermetically connected with the fixing device 92, the pressure guide pipe 91 is hermetically connected with the fixing device 92, the fixing device 92 is hermetically connected with the pressure guide pipe 93, and the pressure guide pipe 93 is hermetically connected with the gas pressure gauge 10.

In addition, the invention also provides a method for testing the pressure loss of the converter oxygen lance pipeline, which comprises the following steps:

step 1: installing a pressure guide pipe 91 and a fixing device 92 to the equivalent throat nozzle 9, replacing the oxygen lance nozzle with the equivalent throat nozzle 9, installing the equivalent throat nozzle 9 on an inner pipe of an oxygen lance for testing, and ensuring the sealing property;

step 2: the oxygen lance for measurement is lifted to a standby position and connected with an oxygen pipeline.

And step 3: the oxygen gun was moved to the work station and lowered to the nitrogen seal of the converter. One end of the pressure guiding pipe 93 is connected with the fixing device 92, and the other end is connected with the gas pressure gauge 10, and the sealing performance is kept. The gas pressure gauge is placed at a position away from the oxygen lance and easy to observe.

And 4, step 4: and (4) lowering the lower end of the oxygen lance for testing to be about 100mm in the nitrogen seal, and starting oxygen to test oxygen so as to check whether the signal of the whole measuring system is normal.

And 5: and adjusting the oxygen flow, and recording a working pressure value (an oxygen pipeline pressure taking point pressure value) and a stagnation pressure value (a gas pressure gauge pressure value) after the oxygen flow and the pressure are stable.

Step 6: adjusting the oxygen flow from small to large or from large to small, repeating the step 5, and measuring more than five groups of data;

and 7: and (4) arranging data, obtaining a working pressure fitting curve and a stagnation pressure fitting curve according to the measured data, and calculating the pressure loss of the pipeline under different working pressures.

During testing, no molten steel and liquid slag are in the converter, and no open fire or fire source exists in 10m around the testing device.

During testing, the oxygen lance cooling water pipe is not connected or water is not connected.

During testing, the smoke hood is shaken out of the converter mouth, and the converter fan system, the dust removal system and the nitrogen sealing system are in an operating state.

The minimum value of the tested working pressure value is lower than 3.5 MPa.

The maximum value of the tested working pressure is larger than the maximum value of the oxygen working pressure in the smelting process of the converter, and all the test points are uniformly distributed as far as possible. The pipeline pressure loss is the difference between the working pressure and the corresponding stagnation pressure.

In conclusion, the invention provides a device and a method for testing the pressure loss of the converter oxygen lance pipeline, which overcome the problem that the pressure loss of the oxygen lance pipeline cannot be determined in the production of a converter, and test the stagnation pressure at the oxygen lance nozzle under different oxygen flow conditions by using a test method in a cold state so as to provide reference for correctly designing the parameters of the oxygen lance nozzle and accurately formulating the operation process of the converter oxygen lance.