CN215103371U

CN215103371U - Converter smelting execution device with high-precision intelligent control function

Info

Publication number: CN215103371U
Application number: CN202023198333.XU
Authority: CN
Inventors: 苗青; 宗京秀; 宣月茜; 李国柱; 孙岳岳
Original assignee: Jinan Engineering Vocational Technical College
Current assignee: Jinan Engineering Vocational Technical College
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-12-10
Anticipated expiration: 2030-12-25

Abstract

The utility model provides a high accuracy intelligent control's converter smelting execution device, include: the system comprises a human-computer interaction interface, an industrial Ethernet, a control valve group, a sensor group and a PLC control module; the PLC control module is respectively in communication connection with the control valve group and the sensor group through an industrial Ethernet; the PLC control module controls the flow of bottom blown gas of the converter and the on-off of the gas through controlling the valve group; the PLC control module induces the flow and pressure of the bottom blown gas of the converter through the sensor group; the utility model overcomes the troubles brought by the switching of the fussy operation and the control mode of the links such as smelting, slag splashing, empty furnace, post stirring, maintenance and the like in the production process of the converter steelmaking. The undisturbed switching of the multi-mode valve position control is realized. The bottom blowing minimum effective loop calculation function processing model realizes high-precision control based on the stability and invariability of a total flow value.

Description

Converter smelting execution device with high-precision intelligent control function

Technical Field

The utility model relates to a steel smelting technical field especially relates to a high accuracy intelligent control's converter smelting execution device.

Background

At present, each large iron and steel industry has own forming control strategy and means for controlling the bottom blowing of the converter, but the switching of each control mode and the control precision do not fully consider different conditions and various problems in the smelting process, and an ideal control effect is not achieved. For example, the lack of organic combination of control of the secondary computer system and other controls, the lack of undisturbed switching processing of several modes, the lack of loop processing during branch blockage and equipment abnormality in various modes, and the like, causes relatively obvious hysteresis to the operation of the control equipment. The control mode is single, the labor intensity of operators is high, the nitrogen/argon switching is not accurately controlled, and the cost control is not facilitated.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough among the above-mentioned prior art, the utility model provides a high accuracy intelligent control's converter smelting execution device, include: the system comprises a human-computer interaction interface, an industrial Ethernet, a control valve group, a sensor group and a PLC control module;

the PLC control module is respectively in communication connection with the control valve group and the sensor group through an industrial Ethernet;

the PLC control module controls the flow of bottom blown gas of the converter and the on-off of the gas through controlling the valve group;

the PLC control module induces the flow and pressure of the bottom blown gas of the converter through the sensor group;

the PLC control module displays the converter running state, the converter bottom blowing state and the mechanism running state by connecting the human-computer interaction interface, and acquires a control instruction input by a user through the human-computer interaction interface.

It should be further noted that the control valve set includes: bottom blowing valve stations distributed below the converter platform;

argon is adopted as the bottom-blown gas of the converter;

the bottom blowing valve station is provided with an argon main gas supply pipeline;

an argon pressure reducing device and an argon pressure stabilizing device are arranged on the argon main gas supply pipeline;

a plurality of argon gas permeable bricks are arranged at the bottom of the converter; the argon gas permeable brick is connected with an argon gas supply branch;

the argon main gas supply pipeline is connected to a plurality of air bricks which are uniformly distributed at the bottom of the converter through an argon gas supply branch after reducing and stabilizing the pressure of argon gas through an argon gas pressure reducing device and an argon gas pressure stabilizing device, and the air bricks are sent into the converter to be blown and stirred.

It is further noted that nitrogen is also used as the bottom-blown gas of the converter;

the bottom blowing valve station is provided with a nitrogen main gas supply pipeline;

a nitrogen pressure reducing device and a nitrogen pressure stabilizing device are arranged on the nitrogen main air supply pipeline;

a plurality of nitrogen gas permeable bricks are arranged at the bottom of the converter;

the nitrogen gas permeable brick is connected with a nitrogen gas supply branch;

the nitrogen main gas supply pipeline is connected to a plurality of air bricks which are uniformly distributed at the bottom of the converter through a nitrogen gas supply branch after reducing and stabilizing the pressure of nitrogen through a nitrogen gas pressure reducing device and a nitrogen gas pressure stabilizing device, and the air bricks are sent into the converter for gas blowing and stirring.

Further, the argon pressure reducing device includes: the argon gas source pressure reducing valve, the argon filter, the argon valve switch limit, the argon manual stop valve, the argon regulating valve, the argon pressure transmitter and the argon pressure display meter;

the argon pressure reducing device reduces the pressure of the argon higher than 1.5MPa to 1.2MPa, and the argon is conveyed to the argon supply branch after being stabilized by the argon pressure stabilizing device.

Further, the nitrogen pressure reducing device includes: the device comprises a nitrogen gas source pressure reducing valve, a nitrogen filter, a nitrogen valve switch limit, a nitrogen manual stop valve, a nitrogen regulating valve, a nitrogen pressure transmitter and a nitrogen pressure display meter;

the nitrogen pressure reducing device reduces the pressure of the nitrogen higher than 1.5MPa to 1.2MPa, and the nitrogen is conveyed to the nitrogen supply branch after being stabilized by the nitrogen pressure stabilizing device.

It should be further noted that each flow branch pipe is respectively provided with a manual valve, a vortex flowmeter, a pressure transmitter, a self-operated bypass flow regulating valve, a flow regulating valve, an electric cut-off valve and a pressure local display meter;

the flow of each branch is automatically set through a PLC control module or manually set on site by an operator;

if the flow of a branch is less than 5Nm3/h and the pressure of the branch is more than 0.95 of the pressure of the air inlet main pipe, the branch pipe is judged to be blocked and an alarm signal is sent out.

It should be further noted that the PLC control module is configured with an automatic operation mode, a manual operation mode, and a maintenance mode.

Further, the switching mode of argon and nitrogen is realized by opening and closing a nitrogen cut-off valve connected with a nitrogen gas collecting tank and an argon gas cut-off valve connected with the argon gas collecting tank;

the nitrogen cut-off valve and the argon cut-off valve are both gas-closed pneumatic valves, namely, the valves are fully opened when the gas is cut off.

It should be further noted that, the PLC control module divides the steel grade into the following three bottom blowing control models according to the difference of the requirement of the steel grade on the nitrogen content [ N ] of the finished product:

a. the steel grade with the content of N less than or equal to 40ppm is blown with argon in the whole process of converter bottom blowing in the blowing process;

b. the N is less than 40ppm and less than or equal to 70ppm, and nitrogen and argon are switched by bottom blowing of the converter in the blowing process;

c. and (N) is more than 70ppm, and the bottom blowing of the converter is carried out with full nitrogen blowing in the blowing process.

Further, it should be noted that the method further includes: an SDM control module;

the SDM control module is in communication connection with the PLC control module;

the SDM control module configures bottom blowing converting control parameters according to the current steel grade based on a preset bottom blowing control mode; and sending the nitrogen and argon to a PLC control module, and executing switching control and flow control of the nitrogen and the argon by the PLC control module.

According to the technical scheme, the utility model has the advantages of it is following:

the utility model relates to a high accuracy intelligent control's converter smelting executing device controls the converter bottom blowing through PLC control module, reply when can having set up production stage, maintenance stage, unusual proruption situation according to the state of steelmaking converting, maintenance, empty stove in-process is handled. The method overcomes the complexity of operations of smelting, slag splashing, furnace emptying, post stirring, maintenance and other links in the production process of converter steelmaking and the disturbance caused by switching of control modes. The undisturbed switching of the multi-mode valve position control is realized. The bottom blowing minimum effective loop calculation function processing model realizes high-precision control based on the stability and invariability of a total flow value.

A converter bottom blowing control system adopts distributed remote I/O to access input and output signals of a field sensor, an instrument and an actuating mechanism. The control system is installed in a decentralized mode and controlled in a centralized mode, construction work amount is greatly reduced, debugging difficulty is reduced, and system maintenance work is facilitated.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a converter smelting execution device with high-precision intelligent control;

FIG. 2 is a bottom blowing control curve of steel grades with [ N ] less than or equal to 40 ppm;

FIG. 3 is a bottom blowing control curve for steel grades with < 40 N.ltoreq.70 ppm;

FIG. 4 is a bottom blowing control curve for steel grades with [ N ] > 70 ppm.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

The utility model provides a converter smelting execution device with high-precision intelligent control, as shown in figure 1, include: the system comprises a human-computer interaction interface, an industrial Ethernet, a control valve group, a sensor group and a PLC control module;

the PLC control module is respectively in communication connection with the control valve group and the sensor group through an industrial Ethernet; the PLC control module controls the flow of bottom blown gas of the converter and the on-off of the gas through controlling the valve group; the PLC control module induces the flow and pressure of the bottom blown gas of the converter through the sensor group; the PLC control module displays the converter running state, the converter bottom blowing state and the mechanism running state by connecting the human-computer interaction interface, and acquires a control instruction input by a user through the human-computer interaction interface.

As an embodiment of the present invention, the control valve assembly includes: bottom blowing valve stations distributed below the converter platform;

argon is adopted as the bottom-blown gas of the converter; the bottom blowing valve station is provided with an argon main gas supply pipeline; an argon pressure reducing device and an argon pressure stabilizing device are arranged on the argon main gas supply pipeline; a plurality of argon gas permeable bricks are arranged at the bottom of the converter; the argon gas permeable brick is connected with an argon gas supply branch; the argon main gas supply pipeline is connected to a plurality of air bricks which are uniformly distributed at the bottom of the converter through an argon gas supply branch after reducing and stabilizing the pressure of argon gas through an argon gas pressure reducing device and an argon gas pressure stabilizing device, and the air bricks are sent into the converter to be blown and stirred.

The gas blown from the bottom of the converter also adopts nitrogen; the bottom blowing valve station is provided with a nitrogen main gas supply pipeline; a nitrogen pressure reducing device and a nitrogen pressure stabilizing device are arranged on the nitrogen main air supply pipeline; a plurality of nitrogen gas permeable bricks are arranged at the bottom of the converter; the nitrogen gas permeable brick is connected with a nitrogen gas supply branch;

The argon pressure reduction device comprises: the argon gas source pressure reducing valve, the argon filter, the argon valve switch limit, the argon manual stop valve, the argon regulating valve, the argon pressure transmitter and the argon pressure display meter;

The nitrogen pressure reduction device comprises: the device comprises a nitrogen gas source pressure reducing valve, a nitrogen filter, a nitrogen valve switch limit, a nitrogen manual stop valve, a nitrogen regulating valve, a nitrogen pressure transmitter and a nitrogen pressure display meter; the nitrogen pressure reducing device reduces the pressure of the nitrogen higher than 1.5MPa to 1.2MPa, and the nitrogen is conveyed to the nitrogen supply branch after being stabilized by the nitrogen pressure stabilizing device.

Each flow branch pipe is respectively provided with a manual valve, a vortex flowmeter, a pressure transmitter, a self-operated bypass flow regulating valve, a flow regulating valve, an electric cut-off valve and a pressure local display meter; the flow of each branch is automatically set through a PLC control module or manually set on site by an operator; if the flow of a branch is less than 5Nm3/h and the pressure of the branch is more than 0.95 of the pressure of the air inlet main pipe, the branch pipe is judged to be blocked and an alarm signal is sent out.

The utility model discloses in, the converter steelmaking that relates to is in adding the converter to scrap steel, slagging material etc. and let scrap steel, slagging material carry out contact oxidation with the molten iron.

Carbon monoxide is generated to produce steel by the heat generated by the chemical reaction between the molten iron and various raw materials. Wherein, the converter steelmaking is to remove carbon, phosphorus, sulfur and deoxidation in molten iron, remove harmful gas and nonmetallic inclusion, and change the chemical composition of steel through a slag former.

The utility model discloses the main technical means who adopts in do: oxygen supply, slag formation, heating, addition of deoxidant and alloying. Impurities and carbon in the pig iron are removed through oxidation reaction, and steel is produced.

The basic smelting process of converter steelmaking is divided into six parts:

(1) inspecting and maintaining furnace body equipment;

(2) adding raw materials into the furnace, and placing the furnace body in a vertical position;

(3) the blowing is started and the first batch of slag is added. When carbon monoxide in the molten iron is generated, flame is sprayed out from a furnace mouth, and at the moment

Basically melting slag materials in the molten iron;

(4) adding a second batch of slag to continue converting, and stopping converting when the flame is reduced;

(5) measuring a sample and determining whether to supplement blowing;

(6) and (5) tapping, and adding a deoxidizing agent for deoxidizing to finish the whole smelting process.

In the converter steelmaking process, oxygen is blown into the furnace body through the top as top blowing of the converter, and oxygen, etc. is blown into the furnace body through the bottom as bottom blowing of the converter. The converter steel-making can adopt top blowing or bottom blowing. In order to enhance the stirring of the molten iron in the converter and ensure that the molten iron reacts more fully, gas is blown into the converter bottom through a spray gun, so that chemical components in the molten iron and the slagging agent react fully.

The utility model relates to a high accuracy intelligent control's converter smelting executing device is that the bottom blowing method is through blowing in gas in the stove bottom, strengthens the stirring to the interior molten iron of stove, makes it smelt the reaction more abundant, increases the interior molten iron of stove from the stirring power, avoids the weakness of oxygen top-blown.

Therefore, the loss of raw materials and a slagging agent can be reduced, the contents of carbon and impurities are reduced, and the smelting speed is increased.

Two methods of a nozzle and an air brick are adopted for supplying air to the furnace bottom. The gas supply type is argon and nitrogen.

The utility model relates to a converter smelting execution device with high-precision intelligent control, which controls bottom blowing smelting through a PLC, perfects an automatic flow and strengthens a self-protection mechanism; the flow of bottom blowing gas is controlled, the consumption of nitrogen and argon is reduced, and the stability and reliability of a bottom blowing system are improved. High-quality molten steel is smelted in an efficient and economic converting mode, and the aims of increasing the yield and producing special-grade steel are fulfilled.

The utility model relates to an execution device is smelted to high accuracy intelligent control's converter blows in nitrogen gas from the bottom in earlier stage at the in-process of converter steelmaking, carries out nitrogen argon when converting 60% -70% of oxygen supply volume and plays the switching, changes into and blows in the argon gas. Because the argon gas cost is higher, the cost can be effectively reduced by switching the gas, and the nitrogen content of the molten steel is prevented from exceeding the standard.

The utility model relates to a bottom blowing in high-precision intelligent control converter smelting execution device is according to the technology order for slagging tap preparation, blowing prophase, blowing later stage, sample wait, reblowing, tapping, splash slag protecting furnace.

The utility model discloses still include: an SDM control module; the SDM control module is in communication connection with the PLC control module; the SDM control module configures bottom blowing converting control parameters according to the current steel grade based on a preset bottom blowing control mode; and sending the nitrogen and argon to a PLC control module, and executing switching control and flow control of the nitrogen and the argon by the PLC control module.

The SDM control module (Security Device Manager) is a graphical data processing tool provided by Cisco. The SDM control module utilizes a WEB interface, Java technology and an interactive configuration guide to enable a user to easily complete the state monitoring and function configuration of the IOS router without knowing a Command Line Interface (CLI). The use of SDM can simplify the workload of the operator and the probability of error.

The utility model relates to a specific process can be: acquiring an operation mode selected by a user; if the mode is the automatic mode, starting the PLC control module and starting the SDM control module; calling a bottom blowing mode on a human-computer interaction interface, and determining a steel grade; sending an ignition signal and igniting; receiving the oxygen content of top blowing, and calculating the ratio of the oxygen content to the total oxygen content; simultaneously, entering a second-level dynamic module for control; loading gas flow and bottom blowing gas stirring flow corresponding to the oxygen consumption; calling a minimum effective loop calculation function processing model; judging whether bottom blowing, blowing and stirring are finished or not, and judging whether repeated blowing and stirring are carried out or not; if the blowing is finished, calling a post-stirring model, and finishing the post-stirring after the preset flow and the preset time are reached; if repeated blowing is needed, keeping the blowing until the tapping condition is reached; tapping is started, and air blowing stirring is carried out according to a preset flow until tapping is finished; and starting the slag splashing process, starting the air valve, and blowing air in the slag splashing process until the slag splashing is finished.

In the utility model, the flow of the nitrogen gas supply branch and the argon gas supply branch are arranged; the automatic setting is carried out through a PLC control module or the field manual setting is carried out by an operator;

The purpose of providing a bypass flow regulating valve is to prevent the branch from clogging, with a minimum flow rate set at 5Nm³About/h; and the flow of each branch is automatically set by a PLC according to a model or manually set by an operator on site. If the flow rate of a certain branch is less than 5Nm³And h, if the pressure is greater than 0.95 of the pressure of the air inlet main pipe, the branch pipe is considered to be blocked, and an alarm signal is sent out.

The nitrogen flow pressure was set as: inlet pressure > 1.5MPa, reduced pressure adjusted to 1.2MP, and maintained at 112Nm 3/h; the flow rate is adjusted to be 18-45 Nm 3/h.

As the utility model provides a pair of embodiment has established the system control model based on under the various mode, has formed a high accuracy intelligent control's converter smelting executing device according to the system control model who establishes. Wherein, PLC control module and SDM control module are the full-automatic mode of bottom blowing.

The system is configured with an automatic operation mode, a manual operation mode and a maintenance mode;

an operator sets an operation mode of the system on a human-computer interaction interface of the server;

the manual operation mode is that an operator reads the information of each device through a control interface and manually sends a control instruction, or the device is controlled to operate on the spot based on an operator field control box;

an operator can adjust the opening proportion of the valve in a control interface, so that the manual control of the gas flow is realized.

In the automatic operation mode, an operator switches to the manual operation mode at any time; but cannot be switched from manual control to automatic control when a smelting period is not finished.

The maintenance mode is a manual control bottom blowing mode.

The maintenance mode is that when a certain regulating valve is maintained, independent operation is directly carried out on a single regulating valve, and other valves are not influenced. When the bottom blowing system is in a PLC control module and an SDM control module is started to control the running state, if a certain branch is damaged by a field flow transmitter or cannot be normally put into the system due to other reasons, the mode is selected for the branch, and the mode is cancelled and then automatically recovered to the original running state; the maintenance state also has two states of flow setting and valve position setting, and the flow setting mode is the same as the flow setting mode; similarly, when the valve position is set, the controller is in a manual state, and an operator can directly operate the valve position to output.

The switching mode of argon and nitrogen is based on that the nitrogen gas trip valve that the nitrogen gas collecting tank is connected and the argon gas trip valve that the argon gas collecting tank is connected open and close and realize switching.

The air-closed valve is fully opened when the air source is lost. When special conditions such as power failure, gas cutoff and the like are met, the bottom blowing system can continuously supply gas, molten liquid is prevented from flowing backwards or a nozzle is prevented from being blocked, and the safety of life and property is guaranteed.

In the manual operation mode, an operator controls the opening and closing of each valve independently on a control interface. In the automatic operation mode, the system selects whether nitrogen or argon is used according to preset data.

If the nitrogen is selected, firstly opening a bottom blowing nitrogen stop valve, and then closing the bottom blowing argon stop valve after the bottom blowing nitrogen stop valve is fully opened; if argon is selected, the bottom-blowing argon stop valve is opened firstly, and the bottom-blowing nitrogen stop valve is closed after the bottom-blowing argon stop valve is fully opened.

To facilitate operator manipulation of the system the present invention may include a printer, video monitor, Liquid Crystal Display (LCD), touch screen display, keyboard, keypad, switch, dial, mouse, track ball, voice recognizer, card reader, paper tape reader, or other known input device. The network connection devices may take the form of modems, modem banks, ethernet cards, Universal Serial Bus (USB) interface cards, serial interfaces, token ring cards, Fiber Distributed Data Interface (FDDI) cards, Wireless Local Area Network (WLAN) cards, radio transceiver cards such as Code Division Multiple Access (CDMA) and/or global system for mobile communications (GSM) radio transceiver cards, and other known network devices. These network connection devices may enable the processor to communicate with the internet or one or more intranets.

As the utility model provides an implementation mode, to the technological process and the control parameter of steelmaking bottom blowing system, for guaranteeing going on smoothly of steelmaking system under different stages and the different situation, also consider the unusual emergency in the smelting process and overhaul the demand in stage simultaneously, combine many-sided data collection and empirical data under the various circumstances, developed following control method.

Considering the complicated operation and system disturbance caused by switching among various models, a bottom blowing main program flow control method is configured, HMI (human machine interface) operators select a bottom blowing smelting control mode in advance, if an emergency situation, such as an SDM (software development management) mode, is selected, equipment faults or branch blockage occurs in the blowing process, the mode can be switched without disturbance through a bottom blowing minimum effective loop calculation function processing model, audible and visual alarm is carried out, after processing or confirmation, the original control mode is automatically switched back, and the total flow value of blowing is not influenced in the whole process.

To the utility model relates to a SDM control module belongs to bottom blowing automatic mode, also calls secondary computer mode, and bottom blowing converting control parameter is issued by secondary computer system, and converter process control computer provides the bottom blowing control model according to the steel grade, carries out this model by bottom blowing system PLC, realizes the SDM secondary control of bottom blowing process.

The PLC control module belongs to a bottom blowing automatic mode, three bottom blowing control models are provided on a bottom blowing HMI operation station according to the difference of nitrogen content of different steel types, as shown in figures 2 to 4, the models are called and executed by a bottom blowing system PLC, and the PLC automatic control of the bottom blowing process is realized.

In the automatic mode, the bottom blowing mode is manual, the adjusting mode of each loop adjusting panel is automatic, and an operator can input a target set value at the automatic adjusting position of the adjusting valve panel, wherein the input value range is 0-200m 3/h.

The utility model discloses still relate to pure manual operation mode: the mode directly sets the valve positions of all the control branches, and the nitrogen and argon switching is completely manually operated by an operator according to actual conditions, so that the manual control of the bottom blowing process is realized.

When a certain regulating valve of the converter in the maintenance mode is maintained, the single regulating valve is directly and independently operated, and other valves are not influenced. When the bottom blowing system is in a PLC or SDM state, if one branch is damaged by a field flow transmitter or cannot be normally put into the system due to other reasons, the mode is selected for the branch, and the mode is cancelled and then automatically recovered to the original running state;

the maintenance state also has two states of flow setting and valve position setting, and the flow setting mode is the same as the flow setting mode; similarly, when the valve position is set, the PLC control module is in a manual state, and an operator can directly operate the valve position to output.

As the implementation mode provided by the utility model, the PLC control module can execute the stirring control after bottom blowing;

and selecting 'post-stirring' to carry out post-stirring according to the steel grade requirement or the oxidability of the molten steel when the blowing end point of the converter is reached. And (3) performing post-stirring operation in an automatic control mode, wherein the PLC automatically selects and inputs post-stirring flow and post-stirring time according to the selected model, and presses a post-stirring start button to start post-stirring. Once the post-mix operation has started, the bottom-blowing of the converter will no longer be carried out at the flow rate specified by the bottom-blowing control model, but at a flow rate specified by the post-mix.

The PLC control module can execute empty furnace control: the time other than the time from the start of charging iron to the time of complete tapping belongs to the empty furnace time. The empty time maintains the gas supply circuit open at a relatively small flow rate.

The PLC control module can execute nitrogen and argon switching control: the nitrogen-argon switching should ensure that the gas is supplied at all times, i.e. a medium shut-off valve must be completely opened, and the shut-off valve for the gas in use must be closed.

The PLC control module can execute the minimum effective loop calculation function processing control: the total flow of bottom blowing gas must be ensured, if each branch is unblocked, the bottom blowing gas should be uniformly distributed to 8 gas supply loops, if a certain loop is blocked, and the system does not process, the gas supply intensity of the converter will be weakened, which is not desirable, so the PLC should judge the blockage, if the loop is blocked, the loop is automatically discarded, the bottom blowing gas should be uniformly distributed in the rest loops again, and the gas supply intensity of each branch is increased. The minimum number of loops participating in the operation during the blowing process cannot be less than 4. If the number of the blowing guns is less than 4, the system is immediately raised to alarm, and operators lift the guns or stop the blowing operation according to the conditions. The specific control logic refers to a bottom blowing minimum effective loop calculation function processing model.

As the utility model provides an embodiment, SDM control module is based on bottom blowing control mode, based on the server according to next stove steelmaking grade, gives bottom blowing converting model, directly sends the model to data communication gateway, through the data processing back, and PLC control module reads the model data through the ethernet, carries out the switching and the high low flow switching of nitrogen gas and argon gas.

The bottom blowing mode data comprises 10 groups of data, and each group of data comprises signals such as a state code, a blowing process oxygen consumption set value, a blowing process time accumulation set value, high and low flow selection, nitrogen and argon switching selection and the like. The PLC program tracks the oxygen amount or the blowing time in real time, judges whether the oxygen consumption amount or the blowing time is reached or not according to the requirements in the state code, controls the opening of the nitrogen or argon stop valve and calculates the flow set value of each branch. The flow controllers of the branches adjust the valve positions of the flow control valves until the actual values are the same as the set values.

As the utility model provides an embodiment, by PLC control module real-time tracking oxygen volume, according to each switching signal's in the curve requirement, judge whether oxygen consumption and various signals reach, the switching of control nitrogen gas or argon gas trip valve calculates the flow setting value of each branch road. The flow controller of each branch adjusts the valve position of the flow control valve until the actual value is the same as the set value.

Bottom blowing is performed in the whole production process of the converter, and the bottom stirring of the converter is controlled by controlling the type and the flow rate of the blowing and stirring gas at an inlet;

according to the different requirements of steel grades on the nitrogen content [ N ] of finished products, the steel grades are divided into the following three bottom blowing control models:

The utility model discloses based on the different periods of steelmaking, the intensity of air feed, the kind of air feed all have the difference, according to the opportunity of above-mentioned curved control nitrogen, argon switching and the size of air feed flow (the setting value SP value in the control model curve that has selected is can revise, gets into and blow to set for the picture can carry out relevant modification work on the bottom).

Further, the utility model discloses an among the manual control mode, nitrogen argon switches and can divide into HMI concentrated operation and other site operation dual mode of machine, and manual control mode is accomplished by HMI operation under the normal conditions, hands under accident and maintenance state and is accomplished by the scene. The flow regulation of each branch is divided into two control modes of flow setting and valve position setting: under the valve position setting mode, the flow controller is in a manual state, and an operator directly changes the valve position opening to adjust the flow; in the flow setting mode, the flow controller is in an automatic state, the operator can change the flow setting value, and the controller automatically adjusts the valve position to enable the flow to reach the setting value.

Nitrogen/argon shut-off valve control. Because each branch is controlled by each branch consisting of the stop valve and the regulating valve, the control of gas supply and blocking of the stop valve is accurate besides accurate flow control of the regulating valve, and therefore, a control program of the nitrogen and argon stop valve is developed.

As the utility model provides an implementation mode, PLC control module adopts schneider's QUANTUM series's 140CPU53414A, obtains relevant original data and target data through communication network equipment and computer system, tests repeatedly, revises perfect the model to reach optimal control effect.

A memory is configured in the PLC control module: the maximum 64Mbyte of the extensible FEPROM/RAM of the transfer memory; and the CPU may have a DB number maximum 10000, a number bar 1 to 16000, a maximum capacity 64kbyte FB number maximum 5000, a number bar 0 to 7999, a maximum capacity 64kbyte FC number maximum 5000, a number bar 0 to 7999, a maximum capacity 64kbyte counter, a timer: the number of S7 counters 2048, the number of S7 timers 2048;

the PLC control module is provided with an interface module which can adopt plug-in IM;

The bus in the system is used for high-speed data transmission of a field layer, and field information is periodically read and output information is periodically sent.

The system has the functions of configuration, diagnosis and alarm. The utility model provides a network communication's transmission rate is 9.6K ~ 12Mbps, and the maximum transmission distance is 1000 meters when 9.6K ~ 187.5Kbps, is 400 meters when 500Kbps, is 200 meters when 1500Kbps, is 100 meters when 3000K ~ 12000Kbps, and available repeater extends to 10 kilometers. The transmission medium can be twisted pair or optical cable, and at most 127 stations can be hooked.

The utility model relates to a high accuracy intelligent control's converter smelting execution device carries out analysis control through PLC control module and SDM control module to converter bottom blowing, reply when can having set up production stage, maintenance stage, unusual proruption situation according to the state of steelmaking converting, maintenance, empty furnace in-process is handled. The method overcomes the complexity of operations of smelting, slag splashing, furnace emptying, post stirring, maintenance and other links in the production process of converter steelmaking and the disturbance caused by switching of control modes. The undisturbed switching of the multi-mode valve position control is realized. The bottom blowing minimum effective loop calculation function processing model realizes high-precision control based on the stability and invariability of a total flow value.

The utility model discloses not only effective to 210t converter bottom blowing control, equally be suitable for to the converter of other capacities, the technical staff only needs suitably to adjust nitrogen gas/argon gas flow setting value can satisfy control.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A converter smelting execution device with high-precision intelligent control is characterized by comprising: the system comprises a human-computer interaction interface, an industrial Ethernet, a control valve group, a sensor group and a PLC control module;

2. The high-precision intelligent control converter smelting execution device according to claim 1,

the control valve group includes: bottom blowing valve stations distributed below the converter platform;

argon is adopted as the bottom-blown gas of the converter;

3. The high-precision intelligent control converter smelting execution device according to claim 2,

the gas blown from the bottom of the converter also adopts nitrogen;

4. The high-precision intelligent control converter smelting execution device according to claim 1,

the PLC control module is configured with an automatic operation mode, a manual operation mode and a maintenance mode.

5. The high-precision intelligent control converter smelting execution device according to claim 3,

the switching mode of argon and nitrogen is based on the switching on and off of a nitrogen stop valve connected with a nitrogen gas collecting tank and an argon gas stop valve connected with an argon gas collecting tank;