CN114659723B - RH vacuum furnace system fault and leakage detection method and device - Google Patents
RH vacuum furnace system fault and leakage detection method and device Download PDFInfo
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- CN114659723B CN114659723B CN202210325665.4A CN202210325665A CN114659723B CN 114659723 B CN114659723 B CN 114659723B CN 202210325665 A CN202210325665 A CN 202210325665A CN 114659723 B CN114659723 B CN 114659723B
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 12
- 238000012795 verification Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a method and a device for detecting faults and leakage of an RH vacuum furnace system, wherein the device comprises a box body, reinforcing I-steel, a supporting pipeline and a blanking system baffle box, wherein the upper end of the box body is provided with an opening and a flange, the side surface of the box body is connected with the supporting pipeline, the upper end of the supporting pipeline is connected with the blanking system baffle box, the reinforcing I-steel is fixed at the bottom of the box body, the opening at the upper end of the box body is in sealing connection with a hot top cover, and the blanking system baffle box is in sealing connection with a blanking system. Compared with the prior art, the invention has the beneficial effects that: the capability test and fault judgment of the vacuum pump system can still be realized when the main valve is in a failure state, and the tightness detection and the quick search of the leakage point of the vacuum blanking system are realized in a non-production state.
Description
Technical Field
The invention relates to the field of RH vacuum furnace steelmaking equipment in a refining furnace, in particular to a method and a device for detecting faults and leakage of an RH vacuum furnace system.
Background
The vacuum treatment equipment of a certain steel factory is a necessary place for fine steel and high added value steel, various technical problems are gradually encountered in the use process of years, whether the vacuum degree reaches the standard or not is a key index for measuring whether the vacuum furnace has production capacity or not, the influence factors of the vacuum degree which does not reach the standard are many, a main vacuum valve is taken as a demarcation point, one side is a blanking system, the other side is a pump system, and the problems in the prior art are as follows: the pump system is characterized in that dust accumulation is adhered to a main valve sealing part in the production process of the pump system, the main valve is often not tightly sealed, so that whether the pump system is perfectly detected or not can not be realized, the problem that whether the pump system has faults or not can not be judged can not be caused, the leakage detection of the second discharging system can only be carried out in the molten steel production state, the non-production mode can not be detected, the three-vacuum pump system is composed of a multi-stage injection pump and a three-seat condenser, all parts of the whole system are in a complete communication state (communicated through a pump body S3A and a pump body S4A pump body), when the vacuum pump system has faults, the problem that the specific area has is difficult to judge in a short time due to the fact that the system parts are more and the arrangement space is larger, the problem that the specific part has faults can not be judged at all, and great resistance is brought to the vacuum fault finding. In conclusion, the vacuum fault finding conditions are limited, and great resistance is brought to fault finding and precision maintenance of the vacuum degree. As shown in fig. 1, the bottom of the hot top is in communication with the outside air, and the entire system is closed only if the RH-immersed tube at the bottom of the hot top is inserted into the molten steel in a state of producing the molten steel.
Disclosure of Invention
The invention aims to provide a method and a device for detecting faults and leakage of an RH vacuum furnace system, which are used for solving the problems that a vacuum pump system cannot be detected, the pump system fault cannot be quickly searched and the like caused by the leakage fault of a blanking system and the inauguration of a vacuum main valve in the faults of RH refining furnace equipment.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a method for detecting faults and leakage of an RH vacuum furnace system comprises the following steps:
1) Manufacturing a simulation test vacuum chamber, connecting an upper opening flange of the simulation test vacuum chamber with a hot top cover flange through a sealing rubber ring during detection, arranging a baffle box on the side surface of the simulation test vacuum chamber, and sealing and connecting a blanking system baffle box with the bottom of a blanking system;
2) The oxygen lance is lowered into the hot top cover and is in sealing connection, oxygen is not blown by the oxygen lance, the pressure of the whole system is reduced to be in a vacuum state through the vacuum pump system, and leakage detection is carried out on the blanking system, the main valve of the vacuum pump system and the vacuum pump system respectively;
a) And (3) detecting a blanking system: because the interior of the blanking system is in a negative pressure state, the leakage point of the blanking system can judge whether leakage occurs or not by listening to sound or the local air flow state of the surface of the blanking system;
b) And detecting a main valve of a vacuum pump system: detecting leakage of the main valve of the vacuum pump system through a manhole of the main valve of the vacuum pump system;
c) Detection of a vacuum pump system: a manual valve is arranged on a connecting pipeline between the condenser C1 and the pump body S3A, and a manual valve is arranged on a connecting pipeline between the condenser C2 and the pump body S4A;
when the main valve of the vacuum pump system is in sealing failure, a blind plate is used for sealing and isolating the baffle box from the blanking system, two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively;
when the main valve of the vacuum pump system is sealed well, the main valve of the vacuum pump system is closed, the two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively.
The vacuum pump system in the step 2) reduces the vacuum degree to be less than or equal to 0.2Kpa of negative pressure.
The utility model provides a device that RH vacuum furnace system trouble and leak detection method adopted, includes box, reinforcement I-steel, support pipeline, baffle case, the upper end opening of box is equipped with the flange, and the side connection support pipeline of box supports the upper end connection unloading system baffle case of pipeline, reinforcement I-steel is fixed in the bottom of box, box upper end opening flange and hot top sealing connection, baffle case and unloading system sealing connection.
The bottom of the box body is provided with lower supporting legs.
And a ladder stand is arranged in the box body.
Compared with the prior art, the invention has the beneficial effects that:
1. the capability test and fault judgment of the vacuum pump system can still be realized when the main valve is in a sealing failure state;
2. the tightness detection and the quick search of the leakage point of the vacuum blanking system are realized in a non-production state;
3. and the quick search of the leakage fault point of the vacuum pump system is realized.
Drawings
Fig. 1 is a state diagram of the production of an RH vacuum furnace system.
Fig. 2 is a schematic structural view of a simulated test vacuum chamber of the present invention.
FIG. 3 is a schematic diagram of the detection of faults and leaks in the RH vacuum furnace system of the present invention.
FIG. 4 is a schematic system diagram of a vacuum furnace with a manual valve according to the present invention.
In the figure: 1-molten steel tank, 2-vacuum trolley, 3-vacuum pump system, 4-hot top cover, 5-blanking system, 6-alloy expansion joint, 7-alloy baffle box, 8-middle vacuum chamber, 9-lower support leg, 10-lower blind plate, 11-reinforcing I-steel, 12-cat ladder, 13-outer wall body, 14-upper flange, 15-baffle box, 16-support pipeline, 17-vacuum pump system main valve, 18-blind plate, 19-simulation test vacuum chamber.
Detailed Description
The present invention will be described in more detail by way of examples, which are merely illustrative of the best modes of carrying out the invention, and do not limit the scope of the invention in any way.
Referring to fig. 2-4, a method for detecting faults and leakage of an RH vacuum furnace system comprises the following steps:
1) Manufacturing a simulation test vacuum chamber 19, connecting an upper flange 14 of the simulation test vacuum chamber 19 with a flange of the hot top cover 4 through a sealing rubber ring during detection, arranging a baffle box 15 on the side surface of the simulation test vacuum chamber 19, and sealing and connecting a blanking system baffle box 15 with the bottom of the blanking system 5;
2) The oxygen lance is lowered into the hot top cover 4 and is in sealing connection, oxygen is not blown by the oxygen lance, the pressure of the whole system is reduced to be in a vacuum state through the vacuum pump system 3, and leakage detection is carried out on the blanking system 5, the main valve 17 of the vacuum pump system and the vacuum pump system 3 respectively;
a) And (5) detecting by a blanking system 5: because the interior of the blanking system 5 is in a negative pressure state, the leakage point of the blanking system 5 can judge whether leakage occurs or not by listening to sound or the local air flow state (soft plastic or cigarettes) on the surface of the blanking system 5;
b) Vacuum pump system main valve 17 detects: the leakage detection of the main valve of the vacuum pump system is carried out through a manhole of the main valve of the vacuum pump system, and the detection of the sealing contact surface can be judged through observation or a feeler gauge;
c) Detection of the vacuum pump system 3: a manual valve K1 is arranged on a connecting pipeline between the condenser C1 and the pump body S3A, and a manual valve K2 is arranged on a connecting pipeline between the condenser C2 and the pump body S4A (see figure 4);
when the main valve seal of the vacuum pump system fails, the baffle box 15 is sealed and isolated from the blanking system by a blind plate 18, two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively;
when the main valve of the vacuum pump system is sealed well, the main valve of the vacuum pump system is closed, the two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively.
The vacuum pump system in the step 2) reduces the vacuum degree to be less than or equal to 0.2Kpa of negative pressure.
The device for detecting faults and leakage of the RH vacuum furnace system comprises a box body, reinforcing I-steel 11, a supporting pipeline 16 and a baffle box 15, wherein the upper end of the box body is opened and provided with a flange, the side surface of the box body is connected with the supporting pipeline 16, the upper end of the supporting pipeline 16 is connected with the baffle box 15, the reinforcing I-steel 11 is fixed at the bottom of the box body, the flange at the upper end of the box body is in sealing connection with a hot top cover 4, and the baffle box 15 is in sealing connection with a blanking system 5.
The bottom of the box body is provided with lower supporting legs 9.
The inside cat ladder 12 that is equipped with of box. The box is formed by connecting an outer wall body 13 and a lower blind plate 10.
The baffle box 15 and the support pipeline 8 are connected through flanges, and a sealing gasket is arranged between the two flanges, so that tightness of connection of the two flanges is ensured. The supporting pipeline 8 is a 16Mn hollow pipeline with the outer wall thickness of 50 mm. The reinforcement of the I-steel 11 serves to prevent deformation of the lower blind plate 2 during use of the device due to an internal pressure of at least 0.2 KPa. Wherein after the cat ladder 4 is used for external debris to get into testing arrangement, the personnel gets into the device through cat ladder 12 and carries out debris clearance.
In practical application, the simulated test vacuum chamber 19 can be lifted to a fixed position on the vacuum trolley 2 by a lifting handle, the simulated test vacuum chamber 19 is moved to the bottom of the thermal top cover 4, and the simulated test vacuum chamber 19 is in sealing connection with the thermal top cover 4, and is in a state in production, as shown in fig. 3. At the moment, the oxygen lance is required to be lowered into the hot top cover 4, and meanwhile, the joint of the oxygen lance and the hot top cover 4 is ensured to be in a sealed and leak-free state, and the oxygen lance does not perform gas blowing operation and only plays a sealing role.
1. When detecting whether the whole blanking system 5 has leakage points, a vacuum pump is started to vacuumize, a main valve 17 of the vacuum pump system is manually opened, the vacuum degree of the vacuum pump system is lower than 0.2KPa, and the leakage search of the blanking system 5 can be performed. By means of negative pressure state inside the system, the leakage point of the blanking system 5 can judge whether leakage exists or not by listening to sound or taking soft plastic or cigarettes and the like.
2. The testing method of the pump system in the failure state of the main valve comprises the following steps: the primary valve 17 of the original vacuum pump system cannot be tested for performance of the pump system when failing. The blind plate 18 is arranged above the baffle box 15, which is equivalent to sealing the upper opening of the baffle box 15. And sealing and isolating the baffle box on the simulation test vacuum chamber from the blanking system by using a blind plate, and using the sealing effect of the simulation test vacuum chamber to replace a main valve with sealing failure to perform pump system leakage detection and leakage rate.
3. The pump system leakage fault segmentation test method comprises the following steps: the original vacuum pump system consists of a jet pump system and a condenser system, all parts of the whole system are in a complete communication state (the pump body S3A and the pump body S4A are communicated), when the vacuum pump system fails, because the parts of the system are more and the arrangement space is larger, the problem of a specific area is difficult to judge accurately in a short time, if the problem of a specific point is to be judged, the problem of the specific part is difficult to be solved, the problem of the specific part cannot be judged at all, and great resistance is brought to the finding of the vacuum degree fault. In the past, the common practice is to detach, open and check each part one by one, the time is as short as more than 3 days, and the difficulty of finding faults is high.
The analysis of the original vacuum pump system finds that the difficulty in troubleshooting is high because of more system components and each component is in a system communication state, so that the original pump system is divided in a segmented mode, each branch part can be checked one by one, the efficiency is improved to a great extent, the searching range is shortened, and the working efficiency is improved to the greatest extent. As shown in fig. 4, since the three condenser sections C1, C2, C3 are connected only by the S3A and S4A pump pipes, two manual valves (K1, K2) are added to the S3A and S4A pump pipes, and both valves are in an open state during production, and the two added valves are closed when a vacuum pump system test is required. Therefore, after improvement, the vacuum pump system is divided into 3 branch parts, 3 branches in the vacuum pump system can be checked when vacuum faults are found, namely, a C1 condenser is connected to a vacuum main valve area, a C2 condenser is connected to a newly-added manual valve K1 area, and a C3 condenser is connected to a newly-added manual valve K2 area, and by checking leakage rate of the independent branch parts, the problem of which branch part is found can be rapidly judged, so that rapid judgment and treatment of fault points are realized. The fault time is shortened to a great extent, and the production efficiency is improved.
Claims (5)
1. The method for detecting faults and leakage of the RH vacuum furnace system is characterized by comprising the following steps of:
1) Manufacturing a simulation test vacuum chamber, connecting an upper opening flange of the simulation test vacuum chamber with a hot top cover flange through a sealing rubber ring during detection, arranging a baffle box on the side surface of the simulation test vacuum chamber, and sealing and connecting a blanking system baffle box with the bottom of a blanking system;
2) The oxygen lance is lowered into the hot top cover and is in sealing connection, oxygen is not blown by the oxygen lance, the pressure of the whole system is reduced to be in a vacuum state through the vacuum pump system, and leakage detection is carried out on the blanking system, the main valve of the vacuum pump system and the vacuum pump system respectively;
a) And (3) detecting a blanking system: because the interior of the blanking system is in a negative pressure state, the leakage point of the blanking system can judge whether leakage occurs or not by listening to sound or the local air flow state of the surface of the blanking system;
b) And detecting a main valve of a vacuum pump system: detecting leakage of the main valve of the vacuum pump system through a manhole of the main valve of the vacuum pump system;
c) Detection of a vacuum pump system: a manual valve is arranged on a connecting pipeline between the condenser C1 and the pump body S3A, and a manual valve is arranged on a connecting pipeline between the condenser C2 and the pump body S4A;
when the main valve of the vacuum pump system is in sealing failure, a blind plate is used for sealing and isolating the baffle box from the blanking system, two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively;
when the main valve of the vacuum pump system is sealed well, the main valve of the vacuum pump system is closed, the two manual valves are closed, the vacuum pump system is divided into three independent test sections, and leakage verification is carried out on the three test sections respectively.
2. The method for detecting faults and leaks in an RH vacuum furnace according to claim 1, wherein the vacuum pump system in said step 2) reduces the vacuum to a negative pressure of 0.2Kpa or less.
3. The device for detecting faults and leakage of the RH vacuum furnace system according to claim 1 or 2, comprising a box body, reinforcing I-steel, a supporting pipeline and a blanking system baffle box, wherein the upper end of the box body is opened and provided with a flange, the side surface of the box body is connected with the supporting pipeline, the upper end of the supporting pipeline is connected with the blanking system baffle box, the reinforcing I-steel is fixed at the bottom of the box body, the upper end opening of the box body is in sealing connection with a hot top cover, and the blanking system baffle box is in sealing connection with a blanking system.
4. The device for detecting faults and leaks of the RH vacuum furnace system according to claim 3, wherein lower supporting legs are arranged at the bottom of the box body.
5. The device for detecting faults and leakage of the RH vacuum furnace system according to claim 3, wherein a ladder stand is arranged in the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210325665.4A CN114659723B (en) | 2022-03-30 | 2022-03-30 | RH vacuum furnace system fault and leakage detection method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210325665.4A CN114659723B (en) | 2022-03-30 | 2022-03-30 | RH vacuum furnace system fault and leakage detection method and device |
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| Publication Number | Publication Date |
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| CN114659723A CN114659723A (en) | 2022-06-24 |
| CN114659723B true CN114659723B (en) | 2023-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034795Y (en) * | 2006-06-30 | 2008-03-12 | 宝山钢铁股份有限公司 | Vacuum degree detecting auxiliary device used for vacuum circulation degassing device middle segment |
| CN103712816A (en) * | 2013-12-25 | 2014-04-09 | 马钢(集团)控股有限公司 | System checking method for substandard RH furnace vacuum degree |
| CN205347497U (en) * | 2016-01-28 | 2016-06-29 | 鞍钢股份有限公司 | Explosion -proof equipment of RH vacuum unloading system |
| CN113063547A (en) * | 2021-03-22 | 2021-07-02 | 攀钢集团攀枝花钢钒有限公司 | RH furnace vacuum system leakage searching method |
| CN215861716U (en) * | 2021-08-26 | 2022-02-18 | 鞍钢股份有限公司 | Vacuum refining furnace feed bin feed opening seal structure |
-
2022
- 2022-03-30 CN CN202210325665.4A patent/CN114659723B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034795Y (en) * | 2006-06-30 | 2008-03-12 | 宝山钢铁股份有限公司 | Vacuum degree detecting auxiliary device used for vacuum circulation degassing device middle segment |
| CN103712816A (en) * | 2013-12-25 | 2014-04-09 | 马钢(集团)控股有限公司 | System checking method for substandard RH furnace vacuum degree |
| CN205347497U (en) * | 2016-01-28 | 2016-06-29 | 鞍钢股份有限公司 | Explosion -proof equipment of RH vacuum unloading system |
| CN113063547A (en) * | 2021-03-22 | 2021-07-02 | 攀钢集团攀枝花钢钒有限公司 | RH furnace vacuum system leakage searching method |
| CN215861716U (en) * | 2021-08-26 | 2022-02-18 | 鞍钢股份有限公司 | Vacuum refining furnace feed bin feed opening seal structure |
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| Title |
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| RH真空度故障查找方法研究;刘铁 等;《鞍钢技术》(第3期);第16-18页 * |
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