CN115074491A - RH furnace circulation gas automatic control method - Google Patents
RH furnace circulation gas automatic control method Download PDFInfo
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- CN115074491A CN115074491A CN202110282960.1A CN202110282960A CN115074491A CN 115074491 A CN115074491 A CN 115074491A CN 202110282960 A CN202110282960 A CN 202110282960A CN 115074491 A CN115074491 A CN 115074491A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 claims description 98
- 229910000831 Steel Inorganic materials 0.000 claims description 64
- 239000010959 steel Substances 0.000 claims description 64
- 238000007872 degassing Methods 0.000 claims description 51
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 40
- 238000012545 processing Methods 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 24
- 229910045601 alloy Inorganic materials 0.000 claims description 23
- 239000000956 alloy Substances 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 23
- 229910052786 argon Inorganic materials 0.000 claims description 21
- 238000009489 vacuum treatment Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 238000005261 decarburization Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 23
- 230000008859 change Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an automatic control method of RH furnace circulating gas, which comprises the following steps: step 1: the RH information acquisition module acquires data; step 2: the RH state judgment module judges; and step 3: and the circulating gas control module controls. According to the technical scheme, the circulating gas can automatically change the type of the circulating gas and adjust the flow rate of the circulating gas in real time in any state of RH, namely from each stage of a production state to two stages of non-production.
Description
Technical Field
The invention relates to a control method, in particular to an RH furnace circulating gas automatic control method, and belongs to the technical field of converter steelmaking control.
Background
RH is composed of a dip pipe for sucking and discharging molten steel, a vacuum tank and a vacuum exhaust system. When molten steel is treated, the two immersion pipes are inserted into the molten steel of a ladle to form a closed system in the molten steel and the vacuum tank. Then, the vacuum exhaust system is started to form a vacuum in the vacuum tank. A pressure difference is formed between the inside and the outside of the bath, and the molten steel rises from the dip pipe to a level (so-called lift height) in equilibrium with the pressure difference. At the same time, a driving gas (Ar or N) is blown from the rising pipe 2 ) The gas expands isothermally due to thermal expansion and pressure reduction, and the volume of bubbles is increased by times, so that the molten steel is driven to rise and is sprayed out of the vacuum tank like a fountain. Along with the rupture of the bubbles, the molten steel becomes fine liquid drops, so that the degassing surface area is greatly increased (by 20-30 times), and the degassing process is accelerated. The gas is separated out from the molten steel and is pumped away, and the degassed molten steel flows back into the ladle from the dip pipe on the other side due to the self weight. Thus, molten steel is continuously tapped from a ladleEntering into vacuum chamber, and returning from the vacuum chamber to ladle to form continuous circulation until the vacuum state in the vacuum chamber is destroyed and returns to 1 atmosphere. The molten steel continuously entering the vacuum chamber is continuously degassed in a vacuum state, and simultaneously, oxygen blowing, decarburization, temperature rise, alloying and other operations can be carried out.
The molten steel passing through the vacuum chamber in a unit time is called a circulation flow Q. Its size is mainly determined by the diameter of the dip tube and the flow rate of the driving gas.
Q＝3.8*10 -3 *D u 0.3 D w 1.1 F Ar 0.31 h Ar 0.5
In the formula D u A rising pipe with internal diameter of cm
D w Internal diameter, cm, of the downcomer
F Ar Driving the gas argon flow, 10 -3 Nm 3 /min
h Ar -circulating the gas pipe to the liquid level, cm
The cycle factor u, i.e. the number of cycles, is the ratio of the total amount of liquid steel passing through the vacuum chamber during the treatment to the treatment capacity Q. Can be represented by the following formula
u＝w·t/Q
W-circulation flow, t/min
t-degassing time, min
Q-ladle molten steel amount, t
When the RH vacuum tank is selected and put into operation, the diameter of the dip pipe is fixed, in the production practice, in order to ensure the production safety, the insertion depth of the molten steel is fixed, namely the height of the liquid level is fixed after the molten steel is circulated to the air pipe, and the different process requirements need corresponding circulation flow, and the control of the circulation flow is mainly changed by adjusting the flow of the driving gas. The adjustment of the circulation gas flow and the switching control of the types can be said to run through the whole RH production process, and the method is a key link of the production control of the RH furnace and is also an unsteady link. In the RH production process, the circulating gas has the following key process state parameters and process control points which need to be strictly controlled and timely adjusted. In order to prevent the circulating gas pipe from being blocked by molten steel or steel slag, the pressure of gas is controlled to be 0.6 MPa-0.8 MPa, low-flow nitrogen with lower cost is used as circulating gas in a non-treatment state, and the circulating gas with larger flow is needed to prevent the circulating gas pipe from being blocked by the cold steel in a baking state; the circulating gas is switched to inert gas argon which does not participate in the molten steel reaction in the processing state, and the molten steel uses lower flow rate in the non-circulating state before the vacuum main valve is opened; the molten steel starts to circulate after the vacuum main valve is opened, and low circulation flow is needed to be set in the early degassing stage for preventing cold steel splashing caused by severe carbon-oxygen reaction; and correspondingly higher circulation flow is required to be set at each process control point of the late stage of oxygen blowing, alloy adding, decarburization and the like to meet the process production requirement.
At present, RH operators are almost adopted at home and abroad to manually input process parameters and adjust the types of the laminar flow gas according to RH states through operation pictures. Two-stage computer modeling control studies, such as the heavy machinery 2005(03) RH molten steel circulation control technique, have been individually conducted, in which the circulation mode control method sets circulation gas types and circulation gas flow rates for different steel types and different treatment stages in an L2 computer model, and issues the circulation gas types and the circulation gas flow rates to L1 through L2, so that flow rate control in four stages, a standby stage, a treatment 1 stage, a treatment 2 stage, and a tapping stage, is achieved. However, it cannot realize all the conditions of RH such as a state of cold steel by baking in standby, a state of not degassing in treatment, a state before, during and after decarburization, and a state of blowing oxygen. And it is required to maintain a secondary communication for a long time at normal and high response speed, and it is impossible to execute a secondary model when a transmission fails.
The patent document is searched to find that CN 201010022762-an RH vacuum circulation control method and device, the control method is used for solving the problem of how to evenly distribute the set flow value of a circulation main pipe to each branch pipe, and when a certain circulation branch pipe fails, the flow of the circulation branch pipe can be automatically distributed to other circulation branch pipes. The method is only a method for distributing the circular flow branch pipes, and can not realize the real-time automatic control of the circular flow according to the RH production state, thereby achieving the purpose of intelligent operation.
In the process of RH processing molten steel, operators need to calculate the outbound temperature, the alloy addition amount and the oxygen blowing amount, and also need to coordinate the production rhythm and the like, so that the information amount of work processing is large, the number of pictures to be monitored in the process is large, and the process parameters and the time nodes are calculated accurately by taking seconds as a unit, so that the phenomenon that the time nodes of the key process parameters are not adjusted timely or accurately is avoided. If the RH operator cannot adjust key process parameters according to time nodes in time, the degassing effect of molten steel can be influenced, quality abnormity, circulation pipe blockage and cold steel generation of a vacuum tank are caused, and the production control of RH cannot be accurately grasped. How to lead the circulating gas to automatically adjust and control in real time according to the process requirements and the RH state liberate RH operators from complicated and repeated manual adjustment, leads the RH operators to pay more attention to the monitoring of the production process and the processing of other data, and has important significance for realizing intelligent refining operation, ensuring safe and stable production, comprehensively mastering the production flow and lightening the operation intensity.
Disclosure of Invention
The invention provides an automatic control method of RH furnace circulating gas aiming at the problems in the prior art, and the technical scheme can automatically change the circulating gas type and adjust the circulating gas flow rate in real time in any RH state, namely from each stage of a production state to two stages of non-production.
In order to achieve the purpose, the technical scheme of the invention is that the automatic control method of the RH furnace circulating gas comprises the following steps:
step 1: the RH information acquisition module acquires;
step 2: the RH state judgment module judges;
and 3, step 3: and the circulating gas control module controls.
As an improvement of the invention, step 1: the RH information acquisition module specifically acquires the following data:
1.1, collecting limit information of an RH hydraulic lifting system;
1.2, collecting ladle arrival information of an RH ladle car system;
1.3, collecting the start and stop information and degassing time information of vacuum treatment of an RH vacuum system;
1.4 acquiring gun position, forced decarburization start and stop, aluminum heating start and stop and atmosphere baking start information of an RH top gun system;
1.5, collecting the alloy turning plate limit information of the vacuum groove of the alloy system;
1.6, collecting the gas type and flow information of the circulating gas.
As an improvement of the present invention, step 2: the RH state judgment module judges as follows:
2.1 the RH hydraulic lifting device is limited at the lower part, and the top gun is at the standby position, no atmosphere baking starting information exists, and the vacuum groove is judged to be in a non-processing and non-baking state;
2.2 the RH hydraulic lifting device is limited at the lower part, and the top gun system has atmosphere baking starting information and judges that the vacuum tank is in a non-processing and baking state;
2.3 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not limited under the steel ladle, and the degassing system stops vacuum treatment and judges that the steel ladle is in a molten steel waiting state;
2.4 the steel ladle of the ladle car system reaches the position where the RH hydraulic lifting device is not positioned, and the degassing system judges that the vacuum tank is in a degassing starting state when vacuum treatment starts;
2.5 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit, the degassing system starts vacuum treatment, the cycle time u reaches 2 times, and the vacuum tank is judged to be in a shallow degassing state;
2.6 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit, the degassing system starts vacuum treatment, the cycle number u reaches 3 times, and the vacuum tank is judged to be in a deep degassing state;
2.7 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the RH top lance system has information of forced decarburization start or aluminum heating start, and the vacuum tank is judged to be in an oxygen blowing state;
2.8 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the alloy system has opening information of an alloy turning plate of the vacuum groove, and judges the alloy adding state of the vacuum groove.
The RH state judgment module can accurately judge the state of the RH vacuum tank through the acquired information, high-load work of manually monitoring the RH state in real time is omitted, the condition that the RH state is not observed due to manual negligence is avoided,
thereby causing the circulating air flow and the type not to be adjusted in time.
As an improvement of the present invention, step 3: the circulation gas control module controls the circulation gas control module as follows:
3.1 the type and flow rate of the circulating gas in each state of the vacuum tank;
3.1.1 when the vacuum tank is in a non-degassing state and an unbaked state, the type of the circulating gas is nitrogen, and the flow rate is L1;
3.1.2 when the vacuum tank is in a non-degassing state and a baking state, the type of the circulating gas is nitrogen, and the flow rate is L2;
3.1.3 when the vacuum tank is in a molten steel waiting state, the type of the circulating gas is argon, and the flow rate is L3;
3.1.4 when the vacuum tank is in a degassing starting state, the circulating gas is argon, and the flow rate is L4;
3.1.5 when the vacuum tank is in a shallow degassing state, the type of the circulating gas is argon, and the flow rate is L5;
3.1.6 when the vacuum tank is in a deep degassing state, the type of the circulating gas is argon, and the flow rate is L6;
3.1.7 when the vacuum tank is in an oxygen blowing state, the type of the circulating gas is argon, and the flow rate is L7;
3.1.8 when the vacuum tank is in an alloy adding state, the type of the circulating gas is argon, and the flow rate is L8;
3.2 controlling the relation of various states of the vacuum tank;
3.2.1 controlling the state of the vacuum tank in a non-processing mode;
when the vacuum tank is in a non-processing mode, controlling according to a 3.1.1 mode when detecting that the vacuum tank is in a 2.1 state, and executing a 3.1.2 mode when detecting that the vacuum tank is in a 2.2 state;
3.2.2 vacuum groove state control relation in the processing mode;
3.2.2.1 when the vacuum tank is in the processing mode, controlling according to the 3.1.3 mode when detecting that the vacuum tank is in the 2.3 state;
3.2.2.2 when the vacuum tank is in the processing mode, controlling according to the 3.1.4 mode when detecting that the vacuum tank is in the 2.4 state;
3.2.2.3 when the vacuum tank is in the processing mode, controlling according to the 3.1.5 mode when detecting that the vacuum tank is in the 2.5 state;
3.2.2.4 when the vacuum tank is in processing mode, the vacuum tank is controlled in 3.1.6 mode when it is detected that the vacuum tank is in 2.6 state;
3.2.2.5 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.7 state and other states simultaneously, controlling according to 3.1.7 mode;
3.2.2.6 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.8 state and other states are simultaneously, controlling according to 3.1.8 mode;
3.2.2.7 the process requires that the vacuum tank must not be added with alloy while blowing oxygen, and the 2.7 state and 2.8 state can not occur simultaneously;
3.3 when the current state of the RH is accurately collected and judged, the control module carries out conversion processing of the RH state and the type and the flow of the circulating gas, sends out instructions of the type and the flow of the corresponding circulating gas to the circulating gas cut-off valve and the regulating valve according to the state and the process requirements, and the circulating gas cut-off valve and the regulating valve automatically control the type and the flow of the circulating gas.
The circulating gas control module immediately performs the type and flow control of the circulating gas according to the RH state judged by the RH state judgment module, the response speed and the accuracy degree are far higher than those of an operator, and various errors and negligence in the control process of the operator are avoided while the intelligent control is realized.
Compared with the prior art, the invention has the advantages that the technical scheme provides the RH vacuum degassing process based on the automatic control of the circulating gas, the technical scheme successfully realizes the automatic accurate judgment and automatic adjustment of the RH furnace according to the RH field state and the process parameters, solves the problem that the RH state needs to be observed by personnel all the time for judgment and control in the past, and successfully solves the great problem that the circulating gas flow cannot be accurately judged and adjusted in time in the RH one-key type vacuum smelting process in the process of gradually pushing unattended field, refining centralized control and intelligent manufacturing work of a steel mill at present. The RH operation operators are liberated from complicated and repeated manual observation, judgment and control, so that the RH operation operators pay more attention to the comprehensive monitoring of the production process, and the RH operation operators provide guarantees for ensuring the production safety, comprehensively mastering the production flow and lightening the operation intensity. In the third RH experiment stage of the plum steel plant, by using the technical scheme, the RH circulation automatic control is successfully realized, the cold steel of the hot bent pipe of the RH vacuum tank is reduced, the normal utilization rate of the system is more than 99 percent, and the automation level on site is greatly improved.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the following detailed description is given in conjunction with examples.
Example 1: an RH furnace circulation gas automatic control method comprises the following steps:
step 1: the RH information acquisition module acquires data;
step 2: the RH state judgment module judges;
and step 3: and the circulating gas control module controls.
Step 1: the RH information acquisition module specifically acquires the following data:
1.1, collecting limit information of an RH hydraulic lifting system;
1.2, collecting ladle arrival information of an RH ladle car system;
1.3, collecting the start and stop information and degassing time information of vacuum treatment of an RH vacuum system;
1.4 acquiring gun position, forced decarburization start and stop, aluminum heating start and stop and atmosphere baking start information of an RH top gun system;
1.5, collecting the alloy turning plate limit information of the vacuum groove of the alloy system;
1.6, collecting the gas type and flow information of the circulating gas.
Step 2: the RH state judgment module judges as follows:
2.1 the RH hydraulic lifting device is limited at the lower part, and the top gun is at the standby position, no atmosphere baking starting information exists, and the vacuum groove is judged to be in a non-processing and non-baking state;
2.2 the RH hydraulic lifting device is limited at the lower part, and the top gun system has atmosphere baking starting information and judges that the vacuum tank is in a non-processing and baking state;
2.3 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not limited under the steel ladle, and the degassing system stops vacuum treatment and judges that the steel ladle is in a molten steel waiting state;
2.4 the arrival of the steel ladle of the ladle car system and the RH hydraulic lifting device are not limited under the situation, and the degassing system judges that the vacuum tank is in a degassing starting state when vacuum treatment is started;
2.5 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit, the degassing system starts vacuum treatment, the cycle time u reaches 2 times, and the vacuum tank is judged to be in a shallow degassing state;
2.6 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, the cycle number u reaches 3 times, and the vacuum tank is judged to be in a deep degassing state;
2.7 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the RH top lance system has information of forced decarburization start or aluminum heating start, and judges that the vacuum tank is in an oxygen blowing state;
2.8 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the alloy system has alloy turning plate opening information of the vacuum tank, and judges the alloy adding state of the vacuum tank.
And step 3: the circulation gas control module controls the circulation gas control module as follows:
3.1 the type and flow rate of the circulating gas in each state of the vacuum tank;
3.1.1 when the vacuum tank is in a non-degassing state and an unbaked state, the type of the circulating gas is nitrogen, and the flow rate is L1;
3.1.2 when the vacuum tank is in a non-degassing state and a baking state, the type of the circulating gas is nitrogen, and the flow rate is L2;
3.1.3 when the vacuum tank is in a molten steel waiting state, the type of the circulating gas is argon, and the flow rate is L3;
3.1.4 when the vacuum tank is in a degassing starting state, the circulating gas is argon, and the flow rate is L4;
3.1.5 when the vacuum tank is in a shallow degassing state, the type of the circulating gas is argon, and the flow rate is L5;
3.1.6 when the vacuum tank is in a deep degassing state, the type of the circulating gas is argon, and the flow rate is L6;
3.1.7 when the vacuum tank is in an oxygen blowing state, the type of the circulating gas is argon, and the flow rate is L7;
3.1.8 when the vacuum tank is in an alloy adding state, the type of the circulating gas is argon, and the flow rate is L8;
3.2 controlling the relation of various states of the vacuum tank;
3.2.1 control relation of vacuum groove state in non-processing mode;
when the vacuum tank is in a non-processing mode, controlling according to a 3.1.1 mode when detecting that the vacuum tank is in a 2.1 state, and executing a 3.1.2 mode when detecting that the vacuum tank is in a 2.2 state;
3.2.2 vacuum groove state control relation in the processing mode;
3.2.2.1 when the vacuum tank is in the processing mode, controlling according to the 3.1.3 mode when detecting that the vacuum tank is in the 2.3 state;
3.2.2.2 when the vacuum tank is in the processing mode, controlling according to the 3.1.4 mode when detecting that the vacuum tank is in the 2.4 state;
3.2.2.3 when the vacuum tank is in the processing mode, controlling according to the 3.1.5 mode when detecting that the vacuum tank is in the 2.5 state;
3.2.2.4 when the vacuum tank is in processing mode, the vacuum tank is controlled in 3.1.6 mode when it is detected that the vacuum tank is in 2.6 state;
3.2.2.5 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.7 state and other states are simultaneously, controlling according to 3.1.7 mode;
3.2.2.6 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.8 state and other states are simultaneously, controlling according to 3.1.8 mode;
3.2.2.7 the process requires that the vacuum tank must not be added with alloy while blowing oxygen, and the 2.7 state and 2.8 state can not occur simultaneously;
3.3 when the current state of the RH is accurately collected and judged, the control module carries out conversion processing of the RH state and the type and the flow of the circulating gas, sends out instructions of the type and the flow of the corresponding circulating gas to the circulating gas cut-off valve and the regulating valve according to the state and the process requirements, and the circulating gas cut-off valve and the regulating valve automatically control the type and the flow of the circulating gas.
The specific embodiment is as follows: in the experimental stage, 3# RH of the steel plant for the plum steel is controlled by a module, and the automatic adjustment of the gas flow is realized according to the production state of the RH vacuum furnace process without manual intervention. According to the actual working condition of No. 3 RH of the plum steel plant and the technical requirements of the production process, the module sets the circulation gas flow: 900L/min for L1, 1600L/min for L2, 2000L/min for L3, 2400L/min for L4, 2600L/min for L5, 2800L/min for L6, 2400L/min for L7, and 2800L/min for L8.
Specific example 1: when the RH is not produced and the vacuum tank is in a non-treatment state, the circulating gas is automatically controlled to have the following performance:
specific example 2: the automatic control achievement of the circulation gas in the natural decarburization process of the RH production of the ultra-low carbon steel is as follows:
specific example 3: the automatic control achievement of the circulation gas in the process of forced decarburization of ultra-low carbon steel produced by RH:
it should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (4)
1. An RH furnace circulation gas automatic control method is characterized by comprising the following steps:
step 1: the RH information acquisition module acquires;
step 2: the RH state judgment module judges;
and step 3: and the circulating gas control module controls.
2. The automatic control method of RH furnace circulation gas according to claim 1, characterized in that step 1: the RH information acquisition module specifically acquires the following data:
1.1, collecting limit information of an RH hydraulic lifting system;
1.2, collecting ladle arrival information of an RH ladle car system;
1.3, collecting the start and stop information and degassing time information of vacuum treatment of an RH vacuum system;
1.4 acquiring gun position, forced decarburization start and stop, aluminum heating start and stop and atmosphere baking start information of an RH top gun system;
1.5, collecting the alloy turning plate limit information of the vacuum groove of the alloy system;
1.6, collecting the gas type and flow information of the circulation gas.
3. The automatic control method of the circulating gas of the RH furnace as claimed in claim 1, wherein the step 2: the RH state judgment module judges as follows:
2.1 the RH hydraulic lifting device is limited at the lower part, and the top gun is at the standby position, no atmosphere baking starting information exists, and the vacuum groove is judged to be in a non-processing and non-baking state;
2.2 the RH hydraulic lifting device is limited at the lower part, and the top gun system has atmosphere baking starting information and judges that the vacuum tank is in a non-processing and baking state;
2.3 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not limited under the steel ladle, and the degassing system stops vacuum treatment and judges that the steel ladle is in a molten steel waiting state;
2.4 the arrival of the steel ladle of the ladle car system and the RH hydraulic lifting device are not limited under the situation, and the degassing system judges that the vacuum tank is in a degassing starting state when vacuum treatment is started;
2.5 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit, the degassing system starts vacuum treatment, the cycle time u reaches 2 times, and the vacuum tank is judged to be in a shallow degassing state;
2.6 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit, the degassing system starts vacuum treatment, the cycle number u reaches 3 times, and the vacuum tank is judged to be in a deep degassing state;
2.7 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the RH top lance system has information of forced decarburization start or aluminum heating start, and judges that the vacuum tank is in an oxygen blowing state;
2.8 the steel ladle of the ladle car system arrives, the RH hydraulic lifting device is not positioned at the lower limit position, the degassing system starts vacuum treatment, and the alloy system has opening information of an alloy turning plate of the vacuum groove, and judges the alloy adding state of the vacuum groove.
4. The automatic control method of RH furnace circulation gas according to claim 1, wherein step 3: the circulation gas control module controls the circulation gas control module as follows:
3.1 the type and flow rate of the circulating gas in each state of the vacuum tank;
3.1.1 when the vacuum tank is in a non-degassing state and an unbaked state, the type of the circulating gas is nitrogen, and the flow rate is L1;
3.1.2 when the vacuum tank is in a non-degassing state and a baking state, the type of the circulating gas is nitrogen, and the flow rate is L2;
3.1.3 when the vacuum tank is in a molten steel waiting state, the type of the circulating gas is argon, and the flow rate is L3;
3.1.4 when the vacuum tank is in a degassing starting state, the circulating gas is argon, and the flow rate is L4;
3.1.5 when the vacuum tank is in a shallow degassing state, the type of the circulating gas is argon, and the flow rate is L5;
3.1.6 when the vacuum tank is in a deep degassing state, the type of the circulating gas is argon, and the flow rate is L6;
3.1.7 when the vacuum tank is in an oxygen blowing state, the type of the circulating gas is argon, and the flow rate is L7;
3.1.8 when the vacuum tank is in an alloy adding state, the type of the circulating gas is argon, and the flow rate is L8;
3.2 controlling the relation of various states of the vacuum tank;
3.2.1 control relation of vacuum groove state in non-processing mode;
when the vacuum tank is in a non-processing mode, controlling according to a 3.1.1 mode when detecting that the vacuum tank is in a 2.1 state, and executing a 3.1.2 mode when detecting that the vacuum tank is in a 2.2 state;
3.2.2 controlling the state of the vacuum tank in the processing mode;
3.2.2.1 when the vacuum tank is in the processing mode, controlling according to the 3.1.3 mode when detecting that the vacuum tank is in the 2.3 state;
3.2.2.2 when the vacuum tank is in the processing mode, controlling according to the 3.1.4 mode when detecting that the vacuum tank is in the 2.4 state;
3.2.2.3 when the vacuum tank is in the processing mode, controlling according to the 3.1.5 mode when detecting that the vacuum tank is in the 2.5 state;
3.2.2.4 when the vacuum tank is in processing mode, the vacuum tank is controlled in 3.1.6 mode when it is detected that the vacuum tank is in 2.6 state;
3.2.2.5 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.7 state and other states are simultaneously, controlling according to 3.1.7 mode;
3.2.2.6 when the vacuum tank is in processing mode, detecting that the vacuum tank is in 2.8 state and other states are simultaneously, controlling according to 3.1.8 mode;
3.2.2.7 the process requires that the vacuum tank must not be added with alloy while blowing oxygen, and the 2.7 state and 2.8 state can not occur simultaneously;
3.3 when the current state of the RH is accurately collected and judged, the control module carries out conversion processing of the RH state and the type and the flow of the circulating gas, sends out instructions of the type and the flow of the corresponding circulating gas to the circulating gas cut-off valve and the regulating valve according to the state and the process requirements, and the circulating gas cut-off valve and the regulating valve automatically control the type and the flow of the circulating gas.
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