CN115096105A - Circulating gas control method based on RH refining process - Google Patents
Circulating gas control method based on RH refining process Download PDFInfo
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- CN115096105A CN115096105A CN202210909359.5A CN202210909359A CN115096105A CN 115096105 A CN115096105 A CN 115096105A CN 202210909359 A CN202210909359 A CN 202210909359A CN 115096105 A CN115096105 A CN 115096105A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides a control method of circulating gas based on an RH refining process; the method comprises the following steps: the RH control system divides the circulating gas into a treatment stage and a non-treatment stage according to the current process stage of the RH refining furnace, and the treatment stage is divided into four process modes according to the process requirements of steel grades; in the non-treatment stage, the circulating gas is divided into different working modes according to the state of the vacuum tank, and different control modes are adopted for the circulating gas under different process modes in the treatment stage and different working modes in the non-treatment stage. The method of the invention overcomes the defects of extensive control of the circulating gas, more operation and large waste in the existing RH refining, and achieves the purposes of operation standardization, intellectualization, energy saving, consumption reduction, cost reduction and efficiency improvement.
Description
Technical Field
The invention belongs to the technical field of automatic control of RH molten steel external refining equipment; in particular to a control method of circulating gas based on an RH refining process.
Background
The RH vacuum refining is widely applied to molten steel treatment process, and is a necessary process method for producing high-quality steel and an important means for producing high value-added steel. In the RH vacuum refining process, molten steel is degassed cyclically in a vacuum vessel under vacuum conditions. The circulating gas is used as lifting gas of the molten steel to enable the molten steel to flow from one immersion pipe to the other immersion pipe, and therefore the purpose of circular degassing of the molten steel under vacuum is achieved. In the non-treatment stage, the dip pipe needs to be maintained or the vacuum tank needs to be baked to keep the state of the dip pipe in a state capable of meeting the production requirement, and at the moment, the circulating gas serving as the protective gas of the vacuum tank needs to be in a working state all the time.
The existing RH circulation gas control method is that an operator sets a circulation flow rate if molten steel treatment is carried out according to the current working state of RH, and the operator can modify the circulation flow rate on an HMI if molten steel treatment is not carried out. The existing control method has the advantages of extensive control mode, more operation times of operators, high energy consumption, and great influence on the production quality of molten steel due to the fact that the circulation gas flow and the circulation time cannot be adjusted in time during molten steel refining.
Disclosure of Invention
The invention aims to provide a circulating gas control method based on an RH refining process.
The invention is realized by the following technical scheme:
the invention relates to a control method of circulation gas of an RH refining furnace, wherein the RH control system divides the control of the circulation gas into two stages: molten steel treatment stage and non-treatment stage; in the processing stage, on the L2 computer or HMI of L1, the circulation gas control is divided into four modes according to the molten steel component information and the target component information to control the circulation gas flow rate and time; in the non-treatment stage, circulating gas is divided into four modes according to the state of the vacuum tank; the control system sets flow according to the circulation gas of each mode to carry out regulation and fault diagnosis, and dynamically adjusts the set flow of each branch according to the actual flow when the flow of individual branch is not satisfied or the flow is alarmed, so as to satisfy the total flow setting.
Preferably, the method for controlling the RH refining furnace circulation gas specifically comprises the following steps:
step 1, judging the stage of RH according to the vacuum main valve, the jacking state and the vacuum pump state, and dividing the stage into a treatment stage and a non-treatment stage;
step 2, in the treatment stage, judging whether the circulating gas is controlled by an L2 computer or a PLC of L1 according to a control source, wherein the control is divided into primary control and secondary control;
step 3, when the control of an L2 computer is performed, inquiring a database according to the component information of the steel grade and the test component of the molten steel, giving out the circular flow required by the current steel grade under the current vacuum degree, and transmitting to an L1-level PLC;
step 4, when the PLC of the L1 is used for control, an operator sets a mode curve on the HMI in advance, and respectively sets the circulation flow and the circulation time of each circulation stage under a light treatment mode, a deep degassing mode, a strong decarburization mode and a free mode;
step 5, an operator selects a set curve according to the process requirement and sends the set flow and time of the circulating gas to a PLC control system;
step 6, in a non-processing stage, the PLC control system collects position signals of the tank trolley, top lance position signals and spray repair trolley position signals, judges the working mode required by circulating gas, and divides the working mode into a baking mode, a spray repair mode, a standby mode and a manual mode; then sending a circulation gas flow set value to the PLC control system according to the flow of the circulation gas in each set mode;
and 7, intelligently processing the flow setting of the circulating gas from the L2 or the HMI after the PLC control system receives the flow setting: and after the set flow is distributed to each branch, comparing and calculating the actual flow fed back with the set total flow, and dynamically adjusting the flow of each branch.
Preferably, in the control of the circulation gas flow rate and time by dividing the circulation gas control into four modes according to the molten steel component information and the target component information in the processing stage, the four modes are as follows: light treatment mode, deep degassing mode, strong decarburization mode, free mode.
Preferably, the circulation gas is divided into four modes in the non-treatment stage according to the state of the vacuum tank, and the three modes are a baking mode, a gunning mode, a standby mode and a manual mode.
Preferably, the control system performs adjustment and fault diagnosis according to the set flow rate of the circulating gas in each mode, specifically: and after the set flow is distributed to each branch, comparing and calculating the actual flow fed back with the set total flow, and dynamically adjusting the flow of each branch.
The invention has the following advantages: the invention relates to a control method of RH refining furnace circulation gas, which divides the circulation gas into a treatment stage and a non-treatment stage according to the current process stage of the RH refining furnace; the treatment stage is divided into four process modes according to the process requirements of steel grades; in the non-treatment stage, the circulating gas is divided into different working modes according to the state of the vacuum tank, and different control modes are adopted for the circulating gas under different process modes in the treatment stage and different working modes in the non-treatment stage respectively, so that the defects of extensive control, more operation and great waste of the circulating gas in the conventional RH refining are overcome, and the aims of operation standardization, intellectualization, energy conservation, consumption reduction, cost reduction and efficiency improvement are fulfilled.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. It should be noted that the following examples are only illustrative of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The principle of the embodiment is as follows: as shown in fig. 1, the RH control system divides the control of the circulating gas into two stages: molten steel treatment stage and non-treatment stage; in the processing stage, on the L2 computer or HMI of L1, the circulation gas control is divided into four modes (light processing mode, deep degassing mode, strong decarburization mode, free mode) according to the molten steel component information and the target component information to control the circulation gas flow rate and time; in the non-treatment stage, circulating gas is divided into four modes (baking mode, spray repair mode, standby mode and manual mode) according to the state of the vacuum tank; the control system sets flow according to the circulation gas of each mode to carry out regulation and fault diagnosis, and dynamically adjusts the set flow of each branch according to the actual flow when the flow of individual branch is not satisfied or the flow is alarmed, so as to satisfy the total flow setting.
The embodiment specifically includes: the PLC control system collects that the jacking height reaches a processing position, the vacuum main valve is in an open position, the system is judged to enter a processing stage, the control authority of the system is at an L2 level computer at the moment, an L2 computer inquires a database, the furnace molten steel is judged to be a deep degassing steel type according to steel type information and molten steel composition information, an L2 computer gives a circulation flow set value to an L1 PLC system, the PLC distributes the flow set value to each branch flow controller of the circulation system according to a received instruction, the PLC collects actual flow values of the branch flow controllers and compares the actual flow values with the flow given by the L2, and if the given flow is inconsistent with the actual flow and the difference is large, the flow set value of each branch is compensated by using the flow difference, so that the set flow is dynamically adjusted to meet the circulation flow required by the process.
Example 2
The principle of the embodiment is as follows: as shown in fig. 1, the RH control system divides the control of the circulating gas into two phases: molten steel treatment stage and non-treatment stage; in the treatment stage, on the L2 computer or HMI of L1, the circulation gas control is divided into four modes (light treatment mode, deep degassing mode, strong decarburization mode, free mode) according to the molten steel composition information and the target composition information to control the circulation gas flow rate and time; in the non-treatment stage, circulating gas is divided into four modes (baking mode, spray repair mode, standby mode and manual mode) according to the state of the vacuum tank; the control system sets flow according to the circulation gas of each mode to carry out regulation and fault diagnosis, and dynamically adjusts the set flow of each branch according to the actual flow when the flow of individual branch is not satisfied or the flow is alarmed, so as to satisfy the total flow setting.
The embodiment specifically includes: the PLC control system collects that the jacking height is at a lower limit position, the vacuum main valve is at a closing position, the jacking gun position is lower than the in-tank standby position, the in-tank is in a flame state, the system judges that the circulating gas is in a combustion mode, a circulating flow set value is assigned according to the circulating gas flow in the preset combustion mode, the PLC distributes the flow set value to each branch flow controller of the circulating system according to a received instruction, the PLC collects the actual flow value of each branch flow controller and compares the actual flow value with the flow assigned by L2, and if the assigned flow is inconsistent with the actual flow and has a large difference, the flow difference is used for compensating the flow set value of each branch, so that the set flow is dynamically adjusted, and the circulating flow meeting the technological requirements is achieved.
The method of the invention overcomes the defects of extensive control of the circulating gas, more operation and large waste in the existing RH refining, and achieves the purposes of operation standardization, intellectualization, energy saving, consumption reduction, cost reduction and efficiency improvement.
The invention provides a circulation gas control method based on an RH refining process, which is realized based on an L1-level PLC control system, an L2-level computer process control system and an RH vacuum refining vacuum tank nitrogen argon circulation system, wherein L1-level PLC hardware and L2-level computer hardware are known technologies.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. A control method of RH refining furnace circulation gas is characterized in that an RH control system divides the control of the circulation gas into two stages: molten steel treatment stage and non-treatment stage; in the processing stage, on the L2 computer or HMI of L1, the circulation gas control is divided into four modes according to the molten steel component information and the target component information to control the circulation gas flow rate and time; in the non-processing stage, the circulation gas is divided into four modes according to the state of the vacuum tank to control the circulation gas flow and time, then the circulation gas is set to flow according to each mode to carry out regulation and fault diagnosis, and when the flow of individual branch is not satisfied or the flow is alarmed, the set flow of each branch is dynamically adjusted according to the actual flow to meet the total flow setting.
2. The method for controlling circulating gas of RH refining furnace as claimed in claim, which comprises the following steps:
step 1, judging the stage of RH according to the vacuum main valve, the jacking state and the vacuum pump state, and dividing the stage into a treatment stage and a non-treatment stage;
step 2, in the treatment stage, judging whether the circulating gas is controlled by an L2 computer or a PLC of L1 according to a control source;
step 3, when the L2 computer is controlled, according to the component information of the steel grade and the target component of the molten steel, inquiring a database, giving the required circulation flow of the current steel grade under the current vacuum degree, and issuing a PLC level L1;
step 4, when the PLC of the L1 is used for control, an operator sets a mode curve on the HMI in advance, and respectively sets the circulation flow and the circulation time of each circulation stage under a light treatment mode, a deep degassing mode, a strong decarburization mode and a free mode;
step 5, an operator selects a set curve according to the process requirement and sends the set flow and time of the circulating gas to a PLC control system;
step 6, in a non-processing stage, the PLC control system collects position signals of the tank trolley, top lance position signals and spray repair trolley position signals, judges the working mode required by the circulating gas and divides the working mode into four modes; sending a set value of the flow rate of the circulating gas to the PLC control system according to the flow rate of the circulating gas in each set mode;
and 7, intelligently processing the flow setting of the circulating gas from the L2 or the HMI after the PLC control system receives the flow setting: and after the set flow is distributed to each branch, comparing and calculating the actual flow fed back with the set total flow, and dynamically adjusting the flow of each branch.
3. The method of controlling circulating gas of RH refining furnace according to claim 1, wherein in said controlling the circulating gas flow rate and time by dividing the circulating gas control into four modes based on the molten steel composition information and the target composition information in the treatment stage, the four modes are: light treatment mode, deep degassing mode, strong decarburization mode, free mode.
4. The method for controlling RH refining furnace circulation gas of claim 1, wherein: and in the non-treatment stage, the circulating gas is divided into four modes according to the state of the vacuum tank, wherein the four modes are a baking mode, a spray repair mode, a standby mode and a manual mode.
5. The method for controlling circulating gas of RH refinery furnace according to claim 1, characterized in that the control system performs regulation and fault diagnosis according to the set flow rate of circulating gas of each mode, specifically: and after the set flow is distributed to each branch, comparing and calculating the actual flow fed back with the set total flow, and dynamically adjusting the flow of each branch.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758052A (en) * | 2012-07-10 | 2012-10-31 | 北京首钢自动化信息技术有限公司 | Control method for RH vacuum processing mode |
| CN106834593A (en) * | 2017-02-13 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of method that RH refining furnace decarbonization process data are determined with reference heats method |
| CN108424996A (en) * | 2018-04-04 | 2018-08-21 | 中冶南方工程技术有限公司 | The emulation mode of dry type oil-sealed rotary pump pumping process for RH vacuum refinings |
| CN110317927A (en) * | 2018-03-30 | 2019-10-11 | 上海梅山钢铁股份有限公司 | A kind of inexpensive calcium treating method of Ultra-low carbon high-aluminum steel |
| CN111878374A (en) * | 2020-07-14 | 2020-11-03 | 中国重型机械研究院股份公司 | Control method of mechanical vacuum pump system based on RH refining process |
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- 2022-07-29 CN CN202210909359.5A patent/CN115096105B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758052A (en) * | 2012-07-10 | 2012-10-31 | 北京首钢自动化信息技术有限公司 | Control method for RH vacuum processing mode |
| CN106834593A (en) * | 2017-02-13 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of method that RH refining furnace decarbonization process data are determined with reference heats method |
| CN110317927A (en) * | 2018-03-30 | 2019-10-11 | 上海梅山钢铁股份有限公司 | A kind of inexpensive calcium treating method of Ultra-low carbon high-aluminum steel |
| CN108424996A (en) * | 2018-04-04 | 2018-08-21 | 中冶南方工程技术有限公司 | The emulation mode of dry type oil-sealed rotary pump pumping process for RH vacuum refinings |
| CN111878374A (en) * | 2020-07-14 | 2020-11-03 | 中国重型机械研究院股份公司 | Control method of mechanical vacuum pump system based on RH refining process |
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