Double-mother-pipe blast furnace air distribution method and system

Abstract

The invention discloses a double-mother-pipe blast furnace air distribution method which comprises the following steps: when a signal indicating normal operation of any unit is received, the unit is controlled to enter fan interlocking input, and the state of the unit is latched by a first register; and when receiving signals that any one electric air dispensation valve is closed in place, the pneumatic air dispensation valve is closed in place, the pressure of the two blast furnace air pipe mother pipes is greater than preset pressure and any two units are in fan interlocking input, latching a judgment result through a second register, and sending an air dispensation system trial input permission operation signal to a control end. When a certain unit breaks down or is abnormal, a standby unit can be rapidly and accurately started or other emergency measures can be taken, the air distribution logic and flow can effectively reduce misoperation or rejection of an air distribution system caused by error signals, the operation stability of the blast furnace is improved, slag filling accidents of the blast furnace are avoided, and the service life of the blast furnace is prolonged. And production interruption and safety accidents are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of iron ore smelting, and in particular relates to an air diversion method and system for a double-mother tube blast furnace. Background Art

[0002] Blast furnace blower (axial flow blower and centrifugal blower) is one of the most important power source equipment during the operation of blast furnace. Its main function is to deliver high temperature, constant air volume (wind pressure) air to the blast furnace to ensure the oxygen required for the burning coke and injected fuel in the blast furnace, and at the same time, a certain wind pressure to overcome the resistance of the air supply system and the material column, and to keep a certain top pressure of the blast furnace.

[0003] The air diversion system plays an important role in the blast furnace drum unit. In blast furnace production, the air diversion system is a backup safeguard to avoid blast furnace slag filling accidents. It sets a connecting valve group between the air supply main pipes of different blast furnaces. When one of the blast furnaces is cut off from air, the connecting valve group is opened, and part of the air volume is allocated from other blast furnaces in normal production to supply it, thereby buying time for the blast furnace to stop and avoiding slag filling accidents. For double-mother-tube blast furnaces, the control logic and operation of the existing air diversion system are relatively cumbersome, and it is impossible to accurately judge the air diversion conditions when the unit is abnormal, which can easily lead to malfunction or refusal of the air diversion system, posing a great risk to the stable operation of the blast furnace. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a double-mother pipe blast furnace air diversion method and system, which sets interlocking control, air diversion system control and final action trigger condition monitoring for the unit, realizes accurate signal judgment, reduces false operation or refusal of the air diversion system caused by erroneous signals, and improves the stability of blast furnace operation.

[0005] In one aspect, the present invention provides a double-mother tube blast furnace air diversion method, comprising the following steps: When receiving a signal that any unit is operating normally, the unit is controlled to enter a fan interlocking state, and the state of the unit is latched by a first register, wherein the fan interlocking of the unit includes two states: an on-state and an off-state; When receiving signals that any electric air damper valve is fully closed, any pneumatic air damper valve is fully closed, the pressure of the main air ducts of the two blast furnaces is greater than the preset pressure, and any two units are in the process of fan interlocking, the current signal state is latched through the second register, and a signal for allowing the air damper system to be tried and put into operation is sent to the control end; When receiving the ventilation system trial start-up permission operation signal and the two electric ventilation valve full-open signals, the current signal state is latched through the third register, and the ventilation system start-up permission signal is sent to the control end; When receiving the fan interlocking start-up signal and the air diversion system start-up permission signal of any two units, the control end is sent to the air diversion master control system start-up permission operation signal; When receiving the following four signals at the same time: a, b, c, d, a pulse signal is sent to trigger the full opening command of the pneumatic air-diffuser valve, and the current signal state is locked in the fourth register and the air-diffuser system is activated and an audible and visual alarm is issued; The four signals a, b, c and d respectively include: a signal: any unit that is in the fan interlocking state trips due to a fault or the unit triggers safe operation; b signal: the check valve of the unit that has been put into use by the fan interlock is closed or the air supply main pipe pressure of one blast furnace is lower than the preset pressure or the air supply main pipe pressure of another blast furnace is lower than the preset pressure; Signal c: Any unit in fan interlocking operation is running normally; d signal: The signal that the fan control system allows operation.

[0006] Through the above technical scheme, the unit is provided with interlocking control, trial start-up of the air ventilation system, permission start-up and final action triggering, ensuring that when a unit failure or specific conditions are triggered in the blast furnace system, the air ventilation system can be started automatically or manually to ensure the normal operation of the blast furnace.

[0007] Optionally, the normal operation condition of the unit includes: receiving no shutdown signal of the unit, the unit operation cabinet is in the closed position, and the main motor current of the unit is greater than 100 A. The specific conditions for the normal operation of the unit are clarified, providing a clear judgment basis for the fan interlocking input.

[0008] Optionally, when any unit in fan interlocking operation exits fan interlocking, the first register, the second register, and the third register are reset. The reset operation of the relevant registers during a specific operation (exiting fan interlocking) is clarified to ensure the correctness of the system status.

[0009] Optionally, it also includes setting a flashing light sign of the fan action signal status and a fan action reset function, which is used to reset the fan action signal separately. This increases the flexibility and operability of the system, allowing users to reset the fan action signal separately, which is convenient for troubleshooting and system maintenance.

[0010] On the other hand, the present invention provides a double-mother pipe blast furnace air diversion system, comprising: a fan interlocking control module for multiple units, an air diversion system trial start-up module, and an air diversion system start-up permission status display module; The fan interlock control module is used to control the input and output of the fan interlock of each unit. The input condition of the fan interlock of each unit is that the unit is operating normally. When any unit is in the fan interlock input, the fan interlock exit control of the corresponding unit changes from inoperable to operable, and the fan interlock input state of the unit is latched using the RS register; The fan-diffusing system trial-initiating module is used to perform a "logic AND" judgment through the four received signals, and use the RS register to latch, and then send it to the control end as a fan-diffusing system trial-initiating signal; The ventilation system allows the input status display module to perform a "logic AND" judgment on the ventilation system test input signal and the full-open signal of the two electric ventilation valves, and use the RS register to latch the judgment result.

[0011] Optionally, the four signals include any electric air damper valve being fully closed, any pneumatic air damper valve being fully closed, the pressure of the main air ducts of the two blast furnaces being greater than a predetermined pressure, and any two units being in the state of fan interlocking. The specific judgment conditions of the air damper system trial start-up module are clarified, providing clear guidance for system operation.

[0012] Optionally, it also includes a fan control system control module, which is used to control the activation and deactivation of the fan control system. The activation conditions of the fan control system include at least two units being in fan interlock activation and the fan control system being allowed to be activated. This realizes the control of the activation and deactivation of the overall fan control system, and improves the reliability and maintainability of the system.

[0013] Optionally, it also includes a ventilation system action condition judgment module, which is used to trigger the ventilation system action when specific conditions are met, and the specific conditions include the simultaneous satisfaction of unit fault tripping, unit check valve closure, blast furnace air supply main pipe pressure lower than the set value and the input ventilation master control system signal; when the specific conditions are met, the RS register is used to latch the result and trigger the pneumatic ventilation valve full opening instruction. It ensures that under specific conditions, the ventilation system can automatically trigger the action to ensure the safe operation of the blast furnace.

[0014] Optionally, a total reset module of the air displacing system is also included, which is used to perform all the following reset actions: a. The fan system action signal is reset; b. Reset the fan interlock signal; c. Reset the RS register of the fan interlock; d. The fan system allows the RS register in the input state to be reset. An overall solution for system reset is provided to facilitate rapid recovery of the system state after system failure or maintenance.

[0015] Optionally, it also includes a flashing light sign indicating the status of the fan action signal, which is used to display a warning message when the fan system is in action; It also includes a fan action reset module, which is used to reset only the RS register of the fan action signal, thereby increasing the system's warning and reset functions and improving the system's security and user experience.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Improving system stability and safety: by setting the fan interlock input and executing a series of logical judgments and actions after receiving a specific signal, it is ensured that during the operation of the blast furnace, when a unit fails or an abnormal situation occurs, the standby unit can be started quickly and accurately or other emergency measures can be taken. The air diversion logic and process can effectively reduce the false operation or refusal of the air diversion system caused by false signals, improve the stability of the blast furnace operation, avoid the occurrence of blast furnace slag filling accidents, and avoid production interruptions and safety accidents.

[0017] 2. Optimize the operation process: The technical solution specifies in detail the whole process from the normal operation of the unit to the input and operation of the ventilation system, including signal reception, logical judgment, command sending and other links, so that the operator can clearly understand the operation requirements of each step, reduce the possibility of misoperation, and improve operation efficiency and accuracy.

[0018] 3. Enhance the automation and intelligence level of the system: By using RS registers to latch key states and setting modules such as trial input, allowable input, and action condition judgment of the air diversion system, the automatic control and intelligent monitoring of the blast furnace air diversion system are realized. This can not only reduce the labor intensity of operators, but also improve the response speed and processing capacity of the system.

[0019] 4. Easy troubleshooting and system maintenance: The technical solution includes designs such as a flashing light sign indicating the status of the fan action signal and a fan action reset function, which can issue obvious warning information when the fan system is in action and can easily perform reset operations during troubleshooting and system maintenance, thereby shortening the fault handling time and improving the reliability and availability of the system.

[0020] 5. Improve production efficiency and economic benefits: By ensuring the stable operation of the blast furnace in the event of unit failure or abnormality, the number and duration of production interruptions are reduced, and production efficiency and output are improved. At the same time, the reduction of losses and waste caused by production interruptions also brings significant economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a logic control flow of a double-mother-tube blast furnace air diversion method provided in an embodiment of the present invention; Figure 2 For the embodiment of the present invention Figure 1 The inverted schematic diagram of part A in the middle; Figure 3 For the embodiment of the present invention Figure 1 Schematic diagram of part B; Figure 4 For the embodiment of the present invention Figure 1 Schematic diagram of part C; Figure 5 A schematic structural diagram of a double-mother pipe blast furnace air diversion system provided in an embodiment of the present invention; Figure 6 A schematic diagram of an operating interface of a double-mother tube blast furnace air diversion system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as middle, top, bottom, left, right, inside, and outside are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0024] The scenario of the present invention to be described is two blast furnaces. Each of the two blast furnaces is equipped with a main pipe. An electric air damper is provided on the two main pipes. In addition, a total of three units are arranged to supply air to the two blast furnaces. The output pipes of the three units are respectively connected to the two main pipes, and a pneumatic air damper is provided at the junction of the three units and the two main pipes. Under normal circumstances, only two of the three units are put into use, and the other one is used as a standby unit. The pneumatic air damper is provided at the junction of the delivery pipes of the three units.

[0025] When one of the units in use fails, the air from the standby unit is transferred to the main pipe corresponding to the failed unit using an air valve; Normally, there are two main units and one auxiliary unit, two in use and one as a standby. Once any of the units in use fails, the air from the standby unit will be used to compensate for the failed unit through the pneumatic air valve. At the same time, under normal circumstances, the electric air valve is in the open state.

[0026] like Figure 1-4 As shown, the specific scheme of the embodiment is as follows: A double mother tube blast furnace air diversion method comprises the following steps: When receiving a signal that any unit is operating normally, the unit is controlled to enter the fan interlocking input, and the state of the unit is latched in the first register; In this embodiment, buttons for starting and exiting fan interlock are set for each unit, namely, buttons for starting 1# fan interlock, exiting 1# fan interlock, starting 2# fan interlock, exiting 2# fan interlock, starting 3# fan interlock and exiting 3# fan interlock.

[0027] Among them, the normal operation conditions of the unit include: receiving no shutdown signal of the unit, the unit operation cabinet is in the closed position, and the main motor current of the unit is greater than 100A. The specific conditions for the normal operation of the unit are clarified here, providing a clear judgment basis for the fan interlocking input.

[0028] When the fan interlocking conditions of the unit are not met, the corresponding button is inoperable, that is, gray. When the conditions are met, the button becomes operable, that is, orange. After successful input, the button turns green to indicate successful operation. At the same time, after clicking any input button successfully, the corresponding fan's exit fan interlocking button changes from gray to orange, and the input result is latched using the RS register.

[0029] When receiving the signal that any electric air damper valve is fully closed, the pneumatic air damper valve is fully closed, the pressure of the main air ducts of the two blast furnaces is greater than the preset pressure, and any two units are in the fan interlocking start-up, the judgment result is latched through the second register, and a signal allowing the air damper system to be tried and started is sent to the control end; It should be noted here that this embodiment also includes status display, specifically: The indicator light for any electric air damper to be fully closed changes from red to green when any electric air damper to be fully closed signal is present; The pneumatic air damper valve fully closed indicator light changes from red to green when the pneumatic air damper valve fully closed signal exists; The indicator light for the pressure of the main air pipes of the two blast furnaces is greater than the preset pressure, which changes from red to green when the pressure of the main air pipes of the two blast furnaces is greater than the preset pressure; The indicator light for any two units in fan interlocking starts changes from red to green when any two units in fan interlocking starts signals exist. This signal is based on the two-out-of-three result judgment of the three fan air supply interlocking starts signals. When receiving the ventilation system trial start-up signal and the electric ventilation valve full-opening signal of the two units, the judgment result is latched through the third register, and the ventilation system is allowed to start; In this embodiment, the ventilation system trial start-up module performs "logical AND" judgment based on the four signals in the status display, and uses the RS register to latch the judgment result as the ventilation system trial start-up signal. When the signal is 0, the corresponding start-up button is gray and cannot be operated. When the signal is 1, the corresponding start-up button turns orange and can be operated. After the start-up is successful, the corresponding start-up button turns green; the result of the RS register is reset after exiting the (1# / 2# / 3#) fan interlock or the ventilation system total reset operation; When receiving the fan interlocking start-up signal of any two units and the signal that the fan diversion system is allowed to start, the control end is sent a signal that allows the fan diversion master control system to operate; At the same time, when a signal is received that a unit that is already in the fan interlocking state has tripped due to a fault or the unit has triggered safe operation, the check valve of the unit that is already in the fan interlocking state is closed, the air supply main pipe pressure of one of the blast furnaces is lower than the preset pressure, the air supply main pipe pressure of another blast furnace is lower than the preset pressure, any unit that is in the fan interlocking state is operating normally, and the air diversion master control system is in operation, a pulse signal is sent to trigger the pneumatic air diversion valve full-open command, and the signal is locked in the fourth register and a signal that the air diversion system has been actuated and an audible and visual alarm are issued.

[0030] Through the above technical scheme, the unit is provided with interlocking control, trial start-up of the air ventilation system, permission start-up and final action triggering, ensuring that when a unit failure or specific conditions are triggered in the blast furnace system, the air ventilation system can be started automatically or manually to ensure the normal operation of the blast furnace.

[0031] When any unit in the fan interlocking state exits the fan interlocking state, the first register, the second register, and the third register are reset. The reset operation of the relevant registers during a specific operation (exiting the fan interlocking state) is clarified to ensure the correctness of the system state.

[0032] In addition, a flashing light sign indicating the status of the fan action signal and a fan action reset function are also provided, which are used to reset the fan action signal separately. This increases the flexibility and operability of the system, allowing users to reset the fan action signal separately, which is convenient for troubleshooting and system maintenance.

[0033] like Figure 5-6 As shown, based on the same technical concept as the above embodiments, the present invention provides a double-mother pipe blast furnace air diversion system, including: a fan interlocking control module for multiple units, an air diversion system trial start-up module, and an air diversion system start-up permission status display module; The fan interlock control module is used to control the fan interlocking of each unit. The fan interlocking condition of each unit is that the unit is operating normally. When any unit is in the fan interlocking state, the fan interlocking exit control of the corresponding unit changes from inoperable to operable, and the fan interlocking state of the unit is latched using the RS register. The fan system trial input module is used to perform "logic AND" judgment through the four received signals, and use the RS register to latch, and then send it to the control end as the fan system trial input signal; The ventilation system enable status display module is used to perform a "logical AND" judgment on the ventilation system trial enable signal and the full-open signal of the two electric ventilation valves, and use the RS register to latch the judgment result.

[0034] In this embodiment, the four signals include any electric air-diffuser valve being fully closed, any pneumatic air-diffuser valve being fully closed, the pressure of the main air pipes of the two blast furnaces being greater than the predetermined pressure, and any two units being in the state of fan interlocking. The specific judgment conditions of the air-diffuser system trial start-up module are clarified, providing clear guidance for system operation.

[0035] In this embodiment, a double-mother tube blast furnace air diversion system also includes an air diversion master control system control module, which is used to control the input and output of the air diversion master control system, and an input button and an output button are respectively set for the input and output of the air diversion master control system; When the conditions for the ventilation control system to be put into operation are not met, the input button is inoperable and appears gray. When the conditions for the input are met, the input button is operable and appears orange. After the ventilation control system is successfully put into operation, the input button changes to operation success and appears green.

[0036] The exit button of the ventilation master control system is inoperable, i.e., gray, before the ventilation master control system is successfully put into operation. It becomes operable, i.e., orange, after the system is successfully put into operation. The conditions for putting the ventilation control system into operation include the interlocking operation of at least two fans and the ventilation system being allowed to be put into operation. This realizes the control of the overall input and output of the ventilation system, and improves the reliability and maintainability of the system.

[0037] In this embodiment, a double-mother pipe blast furnace air diversion system further includes an air diversion system action condition judgment module, which is used to trigger the action of the air diversion system when specific conditions are met.

[0038] Among them, the specific conditions include the simultaneous satisfaction of unit fault tripping, unit check valve closure, blast furnace air supply main pipe pressure lower than the set value and the input of the air diversion master control system signal; when the specific conditions are met, the RS register is used to latch the result and trigger the pneumatic air diversion valve full opening instruction. It ensures that under specific conditions, the air diversion system can automatically trigger the action to ensure the safe operation of the blast furnace.

[0039] It should be noted that the result of the RS register is reset after exiting the (1# / 2# / 3#) fan interlock or the total reset operation of the ventilation system.

[0040] In this embodiment, a double-mother tube blast furnace air diversion system further includes an air diversion system total reset module for performing the following reset actions: a. The fan system action signal is reset; b. Reset the fan interlock signal; c. Reset the RS register of the fan interlock (1# / 2# / 3#); d. The fan system allows the RS register in the input state to be reset. An overall solution for system reset is provided to facilitate rapid recovery of the system state after system failure or maintenance.

[0041] In this embodiment, a double-mother-tube blast furnace air diversion system also includes an air diversion action signal status flashing light sign for displaying a warning message of "Attention! The air diversion system has been activated!" when the air diversion system is in action.

[0042] It also includes a fan action reset module, which is used to reset only the RS register of the fan action signal, thereby increasing the system's warning and reset functions and improving the system's security and user experience.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-mother tube blast furnace air diversion method, characterized in that: The following steps are involved: When receiving a signal that any unit is operating normally, the unit is controlled to enter a fan interlocking state, and the state of the unit is latched by a first register, wherein the fan interlocking of the unit includes two states: an on-state and an off-state; When receiving signals that any electric air damper valve is fully closed, any pneumatic air damper valve is fully closed, the pressure of the main air ducts of the two blast furnaces is greater than the preset pressure, and any two units are in the process of fan interlocking, the current signal state is latched through the second register, and a signal for allowing the air damper system to be tried and put into operation is sent to the control end; When receiving the ventilation system trial start-up permission operation signal and the two electric ventilation valve full-open signals, the current signal state is latched through the third register, and the ventilation system start-up permission signal is sent to the control end; When receiving the fan interlocking start-up signal and the air diversion system start-up permission signal of any two units, the control end is sent to the air diversion master control system start-up permission operation signal; When receiving the following four signals at the same time: a, b, c, d, a pulse signal is sent to trigger the full opening command of the pneumatic air-diffuser valve, and the current signal state is locked in the fourth register and the air-diffuser system is activated and an audible and visual alarm is issued; The four signals a, b, c and d respectively include: Signal a: Any unit that is in the fan interlocking state trips due to a fault or the unit triggers safe operation; b signal: the check valve of the unit that has been put into use by the fan interlock is closed or the air supply main pipe pressure of one blast furnace is lower than the preset pressure or the air supply main pipe pressure of another blast furnace is lower than the preset pressure; Signal c: Any unit in fan interlocking operation is running normally; d signal: The signal that the fan control system allows operation.

2. A double-mother-tube blast furnace air diversion method according to claim 1, characterized in that: The normal operating conditions of the unit include: receiving no shutdown signal of the unit, the unit operation cabinet is in the closed position, and the main motor current of the unit is greater than 100A.

3. A double-mother-tube blast furnace air diversion method according to claim 1, characterized in that: When any unit in the fan interlocking state exits the fan interlocking state, the first register, the second register and the third register are reset.

4. A double-mother-tube blast furnace air diversion method according to claim 1, characterized in that: It also includes setting a flashing light sign for the status of the fan action signal, and a fan action reset function, which is used to reset the fan action signal separately.

5. A double-mother tube blast furnace air displacing system, characterized in that it comprises: Fan interlocking control module for multiple units, air diversion system trial start-up module, and air diversion system allowed start-up status display module; The fan interlock control module is used to control the input and output of the fan interlock of each unit. The input condition of the fan interlock of each unit is that the unit is operating normally. When any unit is in the fan interlock input, the fan interlock exit control of the corresponding unit changes from inoperable to operable, and the fan interlock input state of the unit is latched using the RS register; The fan-diffusing system trial input module is used to perform "logic AND" judgment through the four received signals, and use the RS register to latch, and then send it to the control end as a fan-diffusing system trial input signal; The ventilation system allows the input status display module to perform a "logic AND" judgment on the ventilation system test input signal and the full-open signal of the two electric ventilation valves, and use the RS register to latch the judgment result.

6. A double-mother pipe blast furnace air diversion system according to claim 5, characterized in that: The four signals include any one of the electric air damper valves being fully closed, the pneumatic air damper valve being fully closed, the pressure of the main air ducts of the two blast furnaces being greater than a predetermined pressure, and any two units being in a state of fan interlocking.

7. The double-mother-tube blast furnace air diversion system according to claim 5, characterized in that: It also includes a fan control system control module, which is used to control the activation and deactivation of the fan control system. The activation conditions of the fan control system include at least two units being in fan interlock activation and the fan control system being allowed to be activated.

8. The double-mother-tube blast furnace air diversion system according to claim 5, characterized in that: It also includes an air diversion system action condition judgment module, which is used to trigger the action of the air diversion system when specific conditions are met. The specific conditions include the simultaneous satisfaction of unit fault tripping, unit check valve closure, blast furnace air supply main pipe pressure lower than the set value and the air diversion master control system signal; when the specific conditions are met, the RS register is used to latch the result and trigger the pneumatic air diversion valve full-open instruction.

9. The double-mother-tube blast furnace air diversion system according to claim 5, characterized in that: It also includes a total reset module for the fan system, which is used to perform all the following reset actions: a. The fan system action signal is reset; b. Reset the fan interlock signal; c. Reset the register for fan interlock; d. The registers of the ventilation system allowing the input status to be reset.

10. The double-mother pipe blast furnace air diversion system according to claim 5, characterized in that: It also includes a flashing light sign indicating the status of the fan action signal, which is used to display warning information when the fan system is in action; It also includes a fan action reset module, which is used to reset only the RS register of the fan action signal.

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