CN114231690A - Control method of oxygen lance nitrogen sealing system of converter - Google Patents
Control method of oxygen lance nitrogen sealing system of converter Download PDFInfo
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- CN114231690A CN114231690A CN202111466665.8A CN202111466665A CN114231690A CN 114231690 A CN114231690 A CN 114231690A CN 202111466665 A CN202111466665 A CN 202111466665A CN 114231690 A CN114231690 A CN 114231690A
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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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
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Abstract
The application provides a control method of an oxygen lance nitrogen sealing system of a converter, according to the calculation of smoke dust amount generated in each stage of a smelting period of the converter, when the converter is in a molten iron adding stage and a blowing stage, the oxygen lance nitrogen sealing system is controlled to blow high-pressure nitrogen for nitrogen sealing, the pressure of the high-pressure nitrogen is 1.50MPa to 1.60MPa, when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, the oxygen lance nitrogen sealing system is controlled to blow low-pressure nitrogen for nitrogen sealing, and the pressure of the low-pressure nitrogen is 0.50MPa to 0.60 MPa; according to the actual working condition of the converter, the high-low pressure conversion of the nitrogen sprayed by the nitrogen seal is realized, the traditional single high-pressure operation mode is cancelled, the nitrogen is effectively saved, and the problem that the nitrogen is seriously wasted due to the whole-process high-pressure operation of the oxygen lance nitrogen seal system in the prior art under the condition of no smoke or small smoke quantity is solved.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a control method of an oxygen lance nitrogen sealing system of a converter.
Background
The oxygen lance nitrogen sealing system of the converter comprises a nitrogen sealing seat, a nitrogen sealing plug, a nitrogen storage tank, a nitrogen pipeline, a valve, a nitrogen sealing PLC controller and the like, wherein the nitrogen sealing seat is usually installed at an oxygen lance insertion port of a converter body, the nitrogen sealing plug is usually movably sleeved on an oxygen lance body, and the oxygen lance nitrogen sealing system is used for spraying nitrogen to seal and cover smoke dust and flame in the converter when the oxygen lance blows, so that the purpose of blocking the smoke dust and flame from escaping outwards is achieved, and the phenomenon of smoke leakage and fire production during the oxygen lance blowing is prevented. In the process of blowing after molten iron is added into the converter, a large amount of high-temperature flue gas and dust containing CO combustible gas and the like are generated, and the nitrogen sprayed by the oxygen lance nitrogen sealing system seals the gap between the nitrogen sealing seat and the nitrogen sealing plug and the gap between the nitrogen sealing plug and the oxygen lance, so that harmful gas and dust are effectively prevented from escaping from the converter to pollute the environment, and the gas poisoning of field workers is prevented.
At present, the control of the oxygen lance nitrogen sealing system of the existing converter has the following problems and disadvantages: 1) in different smelting links of the converter, the oxygen lance nitrogen sealing system is always in a high-pressure air injection state, the main valve is normally open, low-pressure nitrogen can meet the nitrogen sealing requirement in certain smelting links without smoke dust or with small smoke dust amount, the site is high in pressure in the whole process, and the nitrogen is seriously wasted; 2) the high-low pressure switching of the sprayed nitrogen cannot be realized; 3) if the emergency treatment mode is lacked, the oxygen lance nitrogen sealing system can not be immediately switched to the high-pressure mode in response to an abnormal condition; 4) the oxygen lance nitrogen sealing system is always in a high-pressure air injection state, the oxygen lance nitrogen sealing system and the oxygen lance are consumed, and the service life of equipment is influenced to a certain extent.
Disclosure of Invention
The invention aims to provide a control method of an oxygen lance nitrogen sealing system of a converter, which effectively saves nitrogen consumption on the premise of preventing smoke and dust in various smelting stages, and further reduces the waste of energy media and the loss of equipment service life.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a control method of an oxygen lance nitrogen sealing system of a converter is characterized in that according to the calculation of the amount of smoke dust generated in each stage of a smelting period of the converter, the smelting period of the converter is sequentially divided into a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage;
when the converter is in a blowing stage, controlling an oxygen lance nitrogen seal system to blow high-pressure nitrogen for nitrogen seal, wherein the pressure of the high-pressure nitrogen is 1.50 MPa-1.60 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.50 MPa-0.60 MPa.
Preferably, when the converter is in a molten iron charging stage, the oxygen lance nitrogen sealing system is controlled to blow high-pressure nitrogen for nitrogen sealing, and the pressure of the high-pressure nitrogen is 1.50MPa to 1.60 MPa.
Preferably, the low-pressure nitrogen is switched to the high-pressure nitrogen 10s before the molten iron charging stage; at 10s after the end of the blowing stage, the high-pressure nitrogen was switched to low-pressure nitrogen.
Preferably, the oxygen lance nitrogen sealing system is controlled by a nitrogen sealing PLC controller, the nitrogen sealing PLC controller is in communication connection with an automatic control system of the converter, the automatic control system of the converter comprises a converter smelting stage analysis program module, the converter smelting stage analysis program module judges that the converter is in a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage or a slag reversing stage after analysis, and the automatic control system of the converter transmits an electric signal of the converter in the stage to the nitrogen sealing PLC controller through the established communication connection.
Preferably, a bypass valve is additionally arranged on the basis of a main valve in the oxygen lance nitrogen sealing system, an air inlet of the main valve is communicated with an air outlet of a high-pressure nitrogen storage tank through a pipeline, an air inlet of the bypass valve is communicated with an air outlet of a low-pressure nitrogen storage tank through a pipeline, an air outlet of the main valve is communicated with an air inlet of a nitrogen sealing seat and an air inlet of a nitrogen sealing plug through nitrogen pipelines respectively, an air outlet of the bypass valve is communicated with an air inlet of the nitrogen sealing seat and an air inlet of the nitrogen sealing plug through the nitrogen pipelines respectively, the bypass valve is an electric control valve, a valve controller of the bypass valve is electrically connected with a nitrogen sealing PLC controller, and the valve controller of the main valve is electrically connected with the nitrogen sealing PLC controller.
Preferably, a one-key high-pressure program module is added in software in an automatic control system of the converter, and when the oxygen lance nitrogen sealing system sprays low-pressure nitrogen and is abnormal, the main valve can be opened by clicking the one-key high-pressure program module by one key to change the mode of spraying high-pressure nitrogen.
Preferably, the high pressure nitrogen flow is according to 9000-12000 m thin flowering followed by 5000-7000 m thin flowering.
Preferably, the duration of the molten iron charging stage is controlled to be 100-120 s.
Preferably, the duration of the blowing stage is controlled to be 12min to 13 min.
The application obtains the following beneficial technical effects:
(1) in the application, when the converter is in the stage of adding molten iron and the stage of converting, control oxygen rifle nitrogen sealing system jetting high-pressure nitrogen and carry out nitrogen seal, when the converter is in the stage of adding the steel scrap, the sampling stage of falling the stove, put the steel stage, the deoxidation alloying stage, when splashing the sediment stage and the stage of falling the sediment, control oxygen rifle nitrogen sealing system jetting low-pressure nitrogen and carry out nitrogen seal, according to the operating condition of converter, the high-low pressure conversion of nitrogen seal nitrogen gas has been realized, traditional single high-pressure operating mode has been cancelled, nitrogen gas has effectively been practiced thrift, the problem of the serious waste nitrogen gas of whole journey high-pressure operation under the condition that does not have smoke and dust or the smoke and dust volume is less of oxygen rifle nitrogen sealing system among the prior art has been solved, the problem of the high-low pressure switching of the nitrogen gas that spouts of oxygen rifle nitrogen sealing system has been solved.
(2) This application adopts automatic control system, according to the operating condition of converter, has realized the nitrogen automatically and has sealed the high-low pressure switching of spouting nitrogen gas, and the manual control oxygen rifle nitrogen seals the system in the past, and this application has realized the automatic control of oxygen rifle nitrogen seal system, has solved the automatic control switching problem of oxygen rifle nitrogen seal system's high-low pressure nitrogen gas.
(3) This application has increased a key high pressure program module, if unusual circumstances such as smoke and dust escape appear under the low pressure mode, the main valve can be opened to a key high pressure program module, can open the main valve door fast, change into jetting high-pressure nitrogen gas, various emergency situation of effective processing, it takes place to ensure finally that nitrogen seals the gaseous escape phenomenon of no smoke and dust and CO in department, the problem of the unable high-pressure nitrogen gas that in time starts of nitrogen sealing system under the emergency has been solved, the emergence of safety ring protects the accident has been stopped.
(4) The application avoids the oxygen lance nitrogen sealing system to be in a high-pressure air injection state all the time, avoids the consumption of a long high-pressure state on the oxygen lance nitrogen sealing system and the oxygen lance, has certain guarantee on the service life of equipment, and solves the problems of large equipment loss and low equipment service life in the prior art.
Drawings
FIG. 1 is a schematic diagram illustrating the operation of a prior art method for controlling a lance nitrogen seal system of a converter;
FIG. 2 is a schematic view of the working principle of the control method of the oxygen lance nitrogen seal system of the converter provided by the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a control method of an oxygen lance nitrogen sealing system of a converter, according to the calculation of the amount of smoke dust generated in each stage of a smelting period of the converter, the smelting period of the converter is sequentially divided into a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage;
when the converter is in a blowing stage, controlling an oxygen lance nitrogen seal system to blow high-pressure nitrogen for nitrogen seal, wherein the pressure of the high-pressure nitrogen is 1.50 MPa-1.60 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.50 MPa-0.60 MPa.
In one embodiment of the application, when the converter is in a molten iron charging stage, the oxygen lance nitrogen sealing system is controlled to blow high-pressure nitrogen for nitrogen sealing, and the pressure of the high-pressure nitrogen is 1.50MPa to 1.60 MPa.
In one embodiment of the present application, the low-pressure nitrogen gas is switched to the high-pressure nitrogen gas 10s before the start of the hot metal charging stage (10 s before the start of the hot metal charging stage); at 10s after the end of the blowing stage (10 s after the end of the blowing stage, delay), the high-pressure nitrogen gas was switched to the low-pressure nitrogen gas.
In one embodiment of the application, the oxygen lance nitrogen sealing system is controlled by a nitrogen sealing PLC controller, the nitrogen sealing PLC controller is in communication connection with an automatic control system of the converter, the automatic control system of the converter comprises a converter smelting stage analysis program module, the converter smelting stage analysis program module judges that the converter is in a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage or a slag reversing stage after analysis, and the automatic control system of the converter transmits an electric signal of the converter in the stage to the nitrogen sealing PLC controller through the established communication connection.
In an embodiment of this application, add the bypass valve on the basis of the main valve in oxygen rifle nitrogen sealing system, the gas outlet intercommunication of pipeline and high-pressure nitrogen gas holding vessel is passed through to the air inlet of main valve, the gas outlet intercommunication of pipeline and low pressure nitrogen gas holding vessel is passed through to the air inlet of bypass valve, the gas outlet of main valve is respectively through the air inlet of nitrogen gas pipeline and nitrogen seal seat and the air inlet intercommunication of nitrogen sealing stopper, the gas outlet of bypass valve passes through respectively the air inlet of nitrogen gas pipeline and nitrogen seal seat and the air inlet intercommunication of nitrogen sealing stopper, the bypass valve is electric control valve, the valve controller of bypass valve is connected with nitrogen sealing PLC controller electricity, the valve controller of main valve is connected with nitrogen sealing PLC controller electricity.
In one embodiment of the application, a one-key high-pressure program module is added in software in an automatic control system of the converter, and when the oxygen lance nitrogen sealing system blows low-pressure nitrogen and is abnormal, a main valve can be opened by clicking the one-key high-pressure program module by one key to change the mode of blowing high-pressure nitrogen.
In an embodiment of the present application, the high pressure nitrogen flow is between 9000 and 12000 and between 5000 and 7000 m.
In one embodiment of the application, the duration of the molten iron charging stage is controlled to be 100-120 s.
In one embodiment of the application, the duration of the blowing stage is controlled to be between 12min and 13 min.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
In order to further understand the present invention, the following detailed description will be made on the control method of the oxygen lance nitrogen sealing system of the converter according to the present invention with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
Embodiment 1 provides a control method of an oxygen lance nitrogen sealing system of a converter, according to the calculation of the amount of smoke dust generated in each stage of a smelting period of the converter, the smelting period of the converter is sequentially divided into a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage;
when the converter is in a blowing stage, controlling an oxygen lance nitrogen seal system to blow high-pressure nitrogen for nitrogen seal, wherein the pressure of the high-pressure nitrogen is 1.55 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.55 MPa;
the high-pressure nitrogen flow is 9000-12000 m for carrying out dry top-bottom-up cultivation, and the low-pressure nitrogen flow is 5000-7000 m for carrying out dry top-up cultivation.
Example 2
Embodiment 2 provides a method for controlling an oxygen lance nitrogen sealing system of a converter, which comprises the steps of sequentially dividing a smelting period of the converter into a scrap adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage according to the calculation of smoke dust generated in each stage of the smelting period of the converter;
when the converter is in a molten iron adding stage and a blowing stage, controlling an oxygen lance nitrogen sealing system to blow high-pressure nitrogen for nitrogen sealing, wherein the pressure of the high-pressure nitrogen is 1.55 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.55 MPa;
switching low-pressure nitrogen into high-pressure nitrogen 10s before the beginning of the molten iron mixing stage; switching the high-pressure nitrogen into low-pressure nitrogen 10s after the blowing stage;
carrying out high-pressure nitrogen top-load bearing thin-layer flowering by 9000-12000 m and carrying out 5000-7000 m high-pressure nitrogen top-load bearing thin-layer flowering by respectively carrying out high-pressure nitrogen top-load bearing thin-layer flowering and high-pressure nitrogen bottom-load bearing thin-layer flowering by respectively carrying out high-pressure nitrogen top-load bearing thin-layer and high-pressure nitrogen bottom-layer thin-layer flowering by respectively carrying out high-layer thin-layer thin-layer thin-layer thin layer;
controlling the duration of the molten iron charging stage to be 100-120 s;
controlling the duration of the converting stage to be 12-13 min;
the oxygen lance nitrogen sealing system is controlled by a nitrogen sealing PLC controller, the nitrogen sealing PLC controller is in communication connection with an automatic control system of the converter, the automatic control system of the converter comprises a converter smelting stage analysis program module, the converter smelting stage analysis program module analyzes and judges that the converter is in a steel scrap adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage or a slag reversing stage, and the automatic control system of the converter transmits an electric signal of the converter in the stage to the nitrogen sealing PLC controller through the established communication connection;
the bypass valve is additionally arranged on the basis of a main valve in an oxygen lance nitrogen sealing system, the air inlet of the main valve is communicated with the air outlet of a high-pressure nitrogen storage tank through a pipeline, the air inlet of the bypass valve is communicated with the air outlet of a low-pressure nitrogen storage tank through a pipeline, the air outlet of the main valve is communicated with the air inlet of a nitrogen sealing seat and the air inlet of a nitrogen sealing plug through a nitrogen pipeline respectively, the air outlet of the bypass valve is communicated with the air inlet of the nitrogen sealing seat and the air inlet of the nitrogen sealing plug through the nitrogen pipeline respectively, the bypass valve is an electric control valve, a valve controller of the bypass valve is electrically connected with a nitrogen sealing PLC controller, and the valve controller of the main valve is electrically connected with the nitrogen sealing PLC controller.
Example 3
Embodiment 3 provides a method for controlling an oxygen lance nitrogen sealing system of a converter, which comprises the steps of sequentially dividing a smelting period of the converter into a scrap adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage according to the calculation of smoke dust generated in each stage of the smelting period of the converter;
when the converter is in a molten iron adding stage and a blowing stage, controlling an oxygen lance nitrogen sealing system to blow high-pressure nitrogen for nitrogen sealing, wherein the pressure of the high-pressure nitrogen is 1.55 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.55 MPa;
carrying out high-pressure nitrogen top-load bearing thin-layer flowering by 9000-12000 m and carrying out 5000-7000 m high-pressure nitrogen top-load bearing thin-layer flowering by respectively carrying out high-pressure nitrogen top-load bearing thin-layer flowering and high-pressure nitrogen bottom-load bearing thin-layer flowering by respectively carrying out high-pressure nitrogen top-load bearing thin-layer and high-pressure nitrogen bottom-layer thin-layer flowering by respectively carrying out high-layer thin-layer thin-layer thin-layer thin layer;
the oxygen lance nitrogen sealing system is controlled by a nitrogen sealing PLC controller, the nitrogen sealing PLC controller is in communication connection with an automatic control system of the converter, the automatic control system of the converter comprises a converter smelting stage analysis program module, the converter smelting stage analysis program module analyzes and judges that the converter is in a steel scrap adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage or a slag reversing stage, and the automatic control system of the converter transmits an electric signal of the converter in the stage to the nitrogen sealing PLC controller through the established communication connection;
the method comprises the steps that a bypass valve is additionally arranged on the basis of a main valve in an oxygen lance nitrogen sealing system, the air inlet of the main valve is communicated with the air outlet of a high-pressure nitrogen storage tank through a pipeline, the air inlet of the bypass valve is communicated with the air outlet of a low-pressure nitrogen storage tank through a pipeline, the air outlet of the main valve is communicated with the air inlet of a nitrogen sealing seat and the air inlet of a nitrogen sealing plug through nitrogen pipelines respectively, the air outlet of the bypass valve is communicated with the air inlet of the nitrogen sealing seat and the air inlet of the nitrogen sealing plug through the nitrogen pipelines respectively, the bypass valve is an electric regulating valve, a valve controller of the bypass valve is electrically connected with a nitrogen sealing PLC (programmable logic controller), and the valve controller of the main valve is electrically connected with the nitrogen sealing PLC;
a one-key high-pressure program module is added in software in an automatic control system of the converter, and when the low-pressure nitrogen blown by an oxygen lance nitrogen sealing system is abnormal, a main valve can be opened by clicking the one-key high-pressure program module by one key to change the mode of blowing the high-pressure nitrogen.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A control method of an oxygen lance nitrogen sealing system of a converter is characterized in that the smelting period of the converter is sequentially divided into a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage according to the calculation of the amount of smoke dust generated in each stage of the smelting period of the converter;
when the converter is in a blowing stage, controlling an oxygen lance nitrogen seal system to blow high-pressure nitrogen for nitrogen seal, wherein the pressure of the high-pressure nitrogen is 1.50 MPa-1.60 MPa;
when the converter is in a scrap steel adding stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage and a slag reversing stage, controlling an oxygen lance nitrogen sealing system to blow low-pressure nitrogen for nitrogen sealing, wherein the pressure of the low-pressure nitrogen is 0.50 MPa-0.60 MPa.
2. The method for controlling the oxygen lance nitrogen sealing system of the converter according to claim 1, wherein when the converter is in a molten iron charging stage, the oxygen lance nitrogen sealing system is controlled to blow high-pressure nitrogen for nitrogen sealing, and the pressure of the high-pressure nitrogen is 1.50MPa to 1.60 MPa.
3. The method for controlling the oxygen lance nitrogen sealing system of the converter according to claim 2, wherein the low-pressure nitrogen is switched to the high-pressure nitrogen 10s before the beginning of the molten iron charging stage; at 10s after the end of the blowing stage, the high-pressure nitrogen was switched to low-pressure nitrogen.
4. The method for controlling the oxygen lance nitrogen sealing system of the converter as claimed in claim 1, wherein the oxygen lance nitrogen sealing system is controlled by a nitrogen sealing PLC controller, the nitrogen sealing PLC controller is in communication connection with an automatic control system of the converter, the automatic control system of the converter comprises a converter smelting stage analysis program module, the converter smelting stage analysis program module is used for determining that the converter is in a scrap steel adding stage, a molten iron adding stage, a blowing stage, a converter reversing sampling stage, a steel discharging stage, a deoxidation alloying stage, a slag splashing stage or a slag reversing stage after analysis, and the automatic control system of the converter transmits an electric signal of the converter in the stage to the nitrogen sealing PLC controller through the established communication connection.
5. The method as claimed in claim 4, wherein a bypass valve is added to a main valve of the oxygen lance nitrogen seal system, an inlet of the main valve is connected to an outlet of a high pressure nitrogen storage tank through a pipeline, an inlet of the bypass valve is connected to an outlet of a low pressure nitrogen storage tank through a pipeline, an outlet of the main valve is connected to an inlet of a nitrogen seal seat and an inlet of a nitrogen seal plug through nitrogen pipelines, an outlet of the bypass valve is connected to an inlet of the nitrogen seal seat and an inlet of the nitrogen seal plug through nitrogen pipelines, the bypass valve is an electric control valve, a valve controller of the bypass valve is electrically connected to a nitrogen seal PLC controller, and a valve controller of the main valve is electrically connected to the nitrogen seal PLC controller.
6. The method as claimed in claim 5, wherein a one-button high-pressure program module is added to software in an automatic control system of the converter, and when the oxygen lance nitrogen sealing system blows low-pressure nitrogen, the main valve can be opened by clicking the one-button high-pressure program module to change to blowing high-pressure nitrogen.
7. The method as claimed in claim 1, wherein the flow of the high pressure nitrogen gas is from 9000 to 12000 mn and the flow of the low pressure nitrogen gas is from 5000 to 7000 m.
8. The method for controlling the oxygen lance nitrogen sealing system of the converter as claimed in claim 1, wherein the duration of the molten iron charging stage is controlled to be 100 s-120 s.
9. The method for controlling the oxygen lance nitrogen sealing system of the converter as claimed in claim 1, wherein the duration of the blowing stage is controlled to be 12min to 13 min.
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| 李春香: "提高不锈钢转炉煤气回收热值和回收量的实践", 《冶金动力》 * |
| 王岚潇等: "PLC在转炉电气控制系统中的应用及改进", 《自动化应用》 * |
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| Publication number | Publication date |
|---|---|
| CN114231690B (en) | 2023-03-24 |
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