CN108504816B - Method for controlling oxygen blowing in converter top blowing process - Google Patents
Method for controlling oxygen blowing in converter top blowing process Download PDFInfo
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- CN108504816B CN108504816B CN201810236463.6A CN201810236463A CN108504816B CN 108504816 B CN108504816 B CN 108504816B CN 201810236463 A CN201810236463 A CN 201810236463A CN 108504816 B CN108504816 B CN 108504816B
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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Abstract
The invention discloses a method for controlling oxygen blowing in a converter top blowing process, which comprises the following steps: the method comprises the following steps: in the blowing mode, before blowing, according to the conditions of raw materials and auxiliary materials added into a converter, calculating a calculated value A0 of the total oxygen amount required by each furnace steel and a calculated value A1 of the oxygen amount required by each oxygen supply branch pipe in the production stage by adopting a mathematical model; step two: calculating the opening preset value A3 of a flow regulating valve arranged on each oxygen supply branch pipe according to the calculated value A0 of the total oxygen amount; step three: during the converting period, the oxygen pressure in the oxygen supply main pipe is controlled to be stabilized at a pressure set value B, and the instantaneous value and the total value of oxygen blown into the converter are controlled according to various smelting requirements and production parameters. The method for controlling oxygen blowing in the converter top blowing process can control the oxygen blowing amount at the top of the converter more quickly, accurately and stably, effectively prevent oxygen overshoot, well meet the process requirements, and can be flexibly applied to control of various gas consumption amounts.
Description
Technical Field
The invention relates to the technical field of metallurgical control, in particular to a method for controlling oxygen blowing in a converter top blowing process.
Background
The main task of converter steelmaking is to smelt molten steel with qualified components and temperature, and the control of top blown oxygen is undoubtedly the key point.
The traditional control mode is either constant flow control or constant pressure control, and by using the control mode, phenomena of unstable oxygen amount, overshoot and the like often occur, and the production defects of seriously influencing molten steel quality, increasing meaningless energy consumption, not meeting the production requirements of subsequent processes and the like exist. In order to overcome the defects of the traditional control mode, the other control mode is that a manual regulation mode is adopted to regulate the oxygen quantity, and the PID is used to automatically regulate the oxygen quantity after the flow is stable, which is still not a better regulation mode.
Therefore, it is an urgent need to solve the above problems by finding a method for controlling top-blown oxygen in a converter, which can rapidly and smoothly control the top-blown oxygen amount to a predetermined value and ensure the stability of the oxygen amount.
Disclosure of Invention
Therefore, the invention provides the method for controlling the oxygen blowing in the converter top blowing process, which can control the oxygen blowing amount at the top of the converter more quickly, accurately and stably, effectively prevent the oxygen amount from being overshot, well meet the process requirements and greatly improve the metallurgical quality, so as to solve the problems in the prior art.
According to the invention, the method for controlling oxygen blowing in the converter top blowing process comprises the following steps:
the method comprises the following steps: in the blowing mode, before blowing, according to the conditions of raw materials and auxiliary materials added into a converter, calculating a calculated value A0 of the total oxygen amount required by each furnace steel and a calculated value A1 of the oxygen amount required by each oxygen supply branch pipe in the production stage by adopting a mathematical model;
step two: calculating the opening preset value A3 of a flow regulating valve arranged on each oxygen supply branch pipe according to the calculated value A0 of the total oxygen amount;
step three: during the converting period, the oxygen pressure in the oxygen supply main pipe is controlled to be stabilized at a pressure set value B, and the instantaneous value and the total value of oxygen blown into the converter are controlled according to various smelting requirements and production parameters.
Preferably, the method further comprises the following steps: before the first step, firstly, the mode judgment is carried out,
when the current blowing mode is judged, a main pipe cut-off valve arranged on the oxygen supply main pipe is opened.
Preferably, the first step further comprises:
in the blowing mode, before blowing begins, whether all production process parameters are normal or not is judged firstly,
when various production process parameters are judged to be normal, a branch pipe cut-off valve arranged on the oxygen supply branch pipe is controlled to be opened,
when various production process parameters are judged to be abnormal, the branch pipe cut-off valve arranged on the oxygen supply branch pipe is controlled to be closed.
Preferably, the first step further comprises:
in the blowing mode, before blowing begins, a pressure regulating valve arranged on an oxygen supply main pipe is controlled to enter a pre-regulation mode.
Preferably, the third step further comprises:
during the converting period, the pressure of oxygen in the oxygen supply main pipe is controlled by the PID controller to be stabilized at a pressure set value B.
Preferably, the control formula of the PID controller is:
p(t)＝Kp·ε+Ki·∫εdt
epsilon-difference between actual value and set value
p (t) -PID controller output, as output of valve opening;
kp is proportional gain;
ki-integration time;
wherein, the values of Kp and Ki are determined by field debugging.
Preferably, the third step further comprises:
the oxygen supply amount of each oxygen supply branch pipe in the production stage is controlled by a PID controller to be stabilized at the calculated value A1 of the oxygen amount.
Preferably, a fine tuning mode is further included, and the PID controller stabilizes the actual oxygen supply amount of each oxygen supply branch pipe in the production stage at the oxygen amount value in the fine tuning mode.
Preferably, the method further comprises the following step four:
and after the blowing is finished, controlling a pressure regulating valve arranged on the oxygen supply main pipe to be closed, and controlling a branch pipe cut-off valve arranged on the oxygen supply branch pipe to be closed.
The method for controlling oxygen blowing in the converter top blowing process can control the oxygen blowing amount at the top of the converter more quickly, accurately and stably, effectively prevent oxygen overshoot, well meet the process requirements, greatly improve the metallurgical quality and be flexibly applied to control of various gas consumption amounts.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram illustrating a converter oxygen supply system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram illustrating a control system of a converter oxygen supply system according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a method of controlling oxygen blowing in a top-blown converter process according to an embodiment of the present invention.
In the figure: the system comprises a main pipe shut-off valve 1, a pressure regulating valve 2, a pressure transmitter 3, a flow sensor 4, a flow regulating valve 5, a branch pipe shut-off valve 6, an operation station 7, a switch 8 and a control device 9.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
FIG. 1 is a schematic diagram illustrating a converter oxygen supply system according to an embodiment of the present invention. As shown in FIG. 1, the oxygen supply system for a converter is used for supplying oxygen to the converter during the top-blowing of oxygen in the converter. The converter oxygen supply system comprises an oxygen supply main pipe, a plurality of oxygen supply branch pipes, a plurality of control elements and sensors, wherein the control elements and the sensors are arranged on the pipes and the oxygen supply branch pipes. Wherein, the one end of oxygen suppliment house steward is connected with the oxygen suppliment source, and a plurality of oxygen suppliment branch pipes are connected respectively in the other end of oxygen suppliment house steward. In this embodiment, two oxygen supply branch pipes are provided, and the ends of the two oxygen supply branch pipes are connected to oxygen supply spray guns, respectively.
Be equipped with house steward trip valve 1, pressure regulating valve 2 and pressure transmitter 3 respectively from the oxygen suppliment source end to the oxygen suppliment branch pipe end on the oxygen suppliment house steward, feedback connection between pressure transmitter 3 and the house steward trip valve 1. Each oxygen supply branch pipe is sequentially provided with a flow sensor 4, a flow regulating valve 5 and a branch pipe stop valve 6 from an oxygen supply main pipe to an oxygen supply spray gun end, wherein the flow transmitter is connected with the flow sensor 4 in a feedback manner.
Fig. 2 is a schematic structural diagram illustrating a control system of a converter oxygen supply system according to an embodiment of the present invention. As shown in FIG. 2, the control system comprises an operation station 7, a switch 8 and a control device 9, wherein the operation station 7 is in communication connection with the control device 9 through the switch 8, and the flow sensor 4 and the pressure transmitter 3 are respectively electrically connected with the control device 9. Wherein, the operation station 7 is provided with an operation button for sending a control instruction to the control device 9, the control device 9 receives the control instruction from the operation station 7 and signals collected from the pressure transmitter 3 and the flow sensor 4, and after making comprehensive analysis and judgment, sends out a control instruction to the outside, such as various valves, so as to control the oxygen supply system, such as oxygen supply pressure and oxygen supply flow. In this embodiment, the control device is selected to be a PLC controller.
FIG. 3 is a flowchart showing a method of controlling oxygen blowing in a top-blown converter process according to an embodiment of the present invention. As shown in fig. 3, the specific steps of the control method may refer to steps S01) -S02).
S01), firstly, judging the mode, and when judging that the current mode is in the blowing mode, opening the main pipe cut-off valve 1 arranged on the oxygen supply main pipe, starting the oxygen supply main pipe to prepare for oxygen supply, otherwise, closing the main pipe cut-off valve 1.
S02), in the blowing mode, before blowing, according to the conditions of raw materials and auxiliary materials added into the converter, calculating a calculated value A0 of the total oxygen amount required by each furnace steel by adopting a mathematical model, and calculating a calculated value A1 of the oxygen amount required by each oxygen supply branch pipe in the production stage.
Specifically, in the blowing mode, a calculated value A0 of the total amount of oxygen required for each steel in the furnace and a calculated value A1 of the amount of oxygen required for each oxygen branch pipe in the production stage are calculated by using a mathematical model according to the conditions of raw materials and auxiliary materials added in the converter before the start of blowing, so as to prepare for the subsequent oxygen supply control.
Further, the method also comprises the step of firstly judging whether each production process parameter is normal or not before blowing starts in the blowing mode. When various production process parameters are judged to be normal, a branch pipe cut-off valve 6 arranged on the oxygen supply branch pipe is controlled to be opened, the oxygen supply branch pipe is opened, and preparation is made for supplying oxygen to the converter top by a spray gun corresponding to the oxygen supply branch pipe. On the contrary, when various production process parameters are judged to be abnormal, the branch pipe cut-off valve 6 arranged on the oxygen supply branch pipe is controlled to be closed, so that the oxygen supply channel of the oxygen supply branch pipe is closed.
Further, in the blowing mode, before the start of blowing, the pressure regulating valve 2 provided on the oxygen supply header pipe is controlled to enter the pre-adjustment mode. When oxygen is initially supplied, the pressure regulating valve 2 is set to enter the pre-regulation mode.
S03), and calculating the preset opening value A3 of the flow regulating valve 5 arranged on each oxygen supply branch pipe according to the calculated value A0 of the total oxygen amount.
Specifically, the control device 9 of the control system calculates the preset opening value A3 of the flow regulating valve 5 provided in each oxygen supply branch pipe based on the calculated value a0 of the total oxygen amount. After the start of the blowing, the valve opening of the flow rate adjusting valve 5(5) is first at a predetermined value (a 3).
S04), during the blowing, controlling the oxygen pressure in the oxygen supply main pipe to be stable at a pressure set value B, and controlling the instantaneous value and the total value of oxygen blown into the converter according to various smelting requirements and production parameters.
Specifically, during the converting period, the control system controls the oxygen pressure in the oxygen supply main pipe to be stable at a pressure set value B, and controls the instantaneous value and the total value of oxygen blown into the converter according to various smelting requirements and production parameters. After the start of the blowing, the valve opening of the flow rate adjustment valve 5 is first at a predetermined value (a 3). During the converting period, the pressure of oxygen in the oxygen supply main pipe is controlled by the PID controller to be stabilized at a pressure set value B. The control formula of the PID controller is shown as a formula (1-1), and specifically comprises the following steps:
p (t) ═ Kp ε + Ki · · (1-1)
Epsilon-difference between actual value and set value
p (t) -PID controller output, as output of valve opening;
kp is proportional gain;
ki-integration time;
wherein, the values of Kp and Ki are determined by field debugging.
The PID controller can enable the oxygen supply pressure to be adjusted stably, response is quick, and overshoot is small.
The control system adjusts the oxygen amount to the calculated value A1 of the oxygen amount in a specified time through a PID controller along with the change of the smelting stage and keeps the oxygen amount stable. The control system is also provided with a fine adjustment mode, the calculated value A1 of the oxygen amount is finely adjusted through the button "↓" and the PID controller enables the actual oxygen amount to be stable at the oxygen amount value in the fine adjustment mode.
Further, in order to stabilize the controlled quantity, i.e. the flow rate measured by the flow rate sensor in real time, to the calculated value a1 of the oxygen amount, a PID, i.e. a proportional integral controller, which works in the same manner as the PID controller of the pressure regulating system, is adopted, and will not be described again here.
S05), and when the blowing is finished, controlling the pressure regulating valve 2 arranged on the oxygen supply main pipe to be closed, and controlling the branch pipe cut-off valve 6 arranged on the oxygen supply branch pipe to be closed.
Specifically, the blowing is finished, the pressure regulating valve provided on the oxygen supply main pipe is controlled to be closed, and the shut-off valve provided on the oxygen supply branch pipe is controlled to be closed to shut off the oxygen supply passage.
The method for controlling oxygen blowing in the converter top blowing process can control the oxygen blowing amount at the top of the converter more quickly, accurately and stably, effectively prevent oxygen amount overshoot, well meet process requirements, greatly improve metallurgical quality and be flexibly applied to control of various gas consumption amounts.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A method for controlling oxygen blowing in a converter top blowing process is characterized by comprising the following steps:
the method comprises the following steps: in the blowing mode, before blowing, according to the conditions of raw materials and auxiliary materials added into a converter, calculating a calculated value A0 of the total oxygen amount required by each furnace steel and a calculated value A1 of the oxygen amount required by each oxygen supply branch pipe in the production stage by adopting a mathematical model;
step two: calculating the opening preset value A3 of a flow regulating valve arranged on each oxygen supply branch pipe according to the calculated value A0 of the total oxygen amount;
step three: during the converting period, the pressure of oxygen in the oxygen supply main pipe is controlled by PID to be stabilized at a pressure set value B, the oxygen supply amount of each oxygen supply branch pipe in the production stage is controlled by a PID controller to be stabilized at a calculated value A1 of the oxygen amount, and the instantaneous value and the total amount value of oxygen blown into the converter are controlled according to various smelting requirements and production parameters;
the control method further comprises a fine adjustment mode, and the PID controller enables the actual oxygen supply amount of each oxygen supply branch pipe in the production stage to be stable at the oxygen amount value in the fine adjustment mode.
2. The method for controlling oxygen blowing in a top-blown converter process according to claim 1, further comprising: before the first step, firstly, the mode judgment is carried out,
when the current blowing mode is judged, a main pipe cut-off valve arranged on the oxygen supply main pipe is opened.
3. The method for controlling oxygen blowing in a top-blown converter process according to claim 1, wherein the first step further comprises:
in the blowing mode, before blowing begins, whether all production process parameters are normal or not is judged firstly,
when various production process parameters are judged to be normal, a branch pipe cut-off valve arranged on the oxygen supply branch pipe is controlled to be opened,
when various production process parameters are judged to be abnormal, the branch pipe cut-off valve arranged on the oxygen supply branch pipe is controlled to be closed.
4. The method for controlling oxygen blowing in a top-blown converter process according to claim 1, wherein the first step further comprises:
in the blowing mode, before blowing begins, a pressure regulating valve arranged on an oxygen supply main pipe is controlled to enter a pre-regulation mode.
5. The method for controlling oxygen blowing in the top-blown converter process of claim 1, wherein the PID controller has a control formula of:
p(t)＝Kp·ε+Ki·∫εdt
ε -the difference between the actual value and the set value;
p (t) -PID controller output, as output of valve opening;
kp is proportional gain;
ki-integration time;
wherein, the values of Kp and Ki are determined by field debugging.
6. The method for controlling oxygen blowing in the top-blown converter process of claim 1, further comprising the step four of:
and after the blowing is finished, controlling a pressure regulating valve arranged on the oxygen supply main pipe to be closed, and controlling a branch pipe cut-off valve arranged on the oxygen supply branch pipe to be closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810236463.6A CN108504816B (en) | 2018-03-21 | 2018-03-21 | Method for controlling oxygen blowing in converter top blowing process |
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| CN201810236463.6A CN108504816B (en) | 2018-03-21 | 2018-03-21 | Method for controlling oxygen blowing in converter top blowing process |
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| CN115125362A (en) * | 2022-07-07 | 2022-09-30 | 马鞍山钢铁股份有限公司 | Control method of electric furnace converting oxygen regulating valve |
| CN115507657B (en) * | 2022-09-28 | 2024-04-26 | 昆明理工大学 | Nonlinear oxygen-enriched blowing method based on chaotic mapping and electronic equipment |
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| CN101956041B (en) * | 2010-09-28 | 2013-06-26 | 莱芜钢铁集团有限公司 | Converter oxygen-blowing control method and device |
| CN102010928B (en) * | 2010-12-15 | 2012-09-26 | 武汉钢铁(集团)公司 | Converter oxygen lance blowing control method based on dry dedusting process |
| CN102943144B (en) * | 2012-11-02 | 2014-03-12 | 中冶京诚工程技术有限公司 | Carbon steel converter automatic control method for adaptable blowing-out turning down operation |
| CN203256295U (en) * | 2013-03-29 | 2013-10-30 | 中冶南方工程技术有限公司 | Self-adapted regulation control system of oxygen blowing pressure of converter |
| CN104232834B (en) * | 2014-08-29 | 2017-09-08 | 武汉钢铁(集团)公司 | Pneumatic steelmaking automaton and its application method based on pattern |
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