A long-term shutdown maintenance method for a blast furnace TRT

Abstract

The embodiment of the present application provides a long-term shutdown maintenance method for a blast furnace TRT in a metallurgical industry, which realizes the opening and closing control of a static vane (12) in two different modes, and specifically comprises the following steps: S1: in the simulation production mode, a hydraulic servo valve table (17) is connected to a static vane drive oil cylinder (21) to control the automatic action of the static vane (12) in the shutdown state, the simulation production control action is realized, and the effect that the static vane (12) reaches linear opening or closing is realized; S2: in the non-simulation production mode, a control valve table is connected in parallel with the hydraulic servo valve table (17) to the static vane drive oil cylinder (21), the static vane drive oil cylinder (21) is connected to the control valve table to control the opening and closing action of the static vane (12) in the shutdown state, and in this mode, the static vane (12) realizes instantaneous full opening or instantaneous full closing. Through the opening and closing action of the static vane, the rusting and blocking of the mechanical structure of the blast furnace TRT during long-term shutdown can be prevented.

Description

Technical Field

[0001] This invention relates to the metallurgical industry, specifically to the field of blast furnace TRT maintenance. Background Technology

[0002] Currently, waste heat and pressure power generation (TRT) units are widely used in the metallurgical industry. During the shutdown period of a TRT unit, due to the influence of the environment and media, components may experience corrosion, rust, and deformation, affecting the normal operation of the turbine.

[0003] In the process of realizing this invention, the applicant discovered that the prior art has at least the following problems: when the TRT unit is shut down for a long time, the parts may rust and deform. Summary of the Invention

[0004] To address the issue of potential rust and deformation of components during long-term shutdown of TRT units, this invention provides a method for maintaining and servicing blast furnace TRT units during long-term shutdown.

[0005] A control valve platform is provided, which is connected in parallel with the hydraulic servo valve platform 17 to the stator vane drive cylinder 21. This allows for the on / off control of the stator vane 12 in two different modes, specifically including:

[0006] Step S1: In simulated production mode, the stationary vane 12 is automatically controlled to move in the shutdown state by connecting the hydraulic servo valve platform 17 to the stationary vane drive cylinder 21, so that the stationary vane 12 achieves the effect of linear switching for a period of time.

[0007] Step S2: In non-simulated production mode, the stationary vane 12 is switched on and off in the shutdown state by controlling the valve platform connected to the stationary vane drive cylinder 21. In this mode, the stationary vane 12 can be fully opened or fully closed instantaneously.

[0008] Further, step S2 specifically includes:

[0009] Establish a control valve platform;

[0010] The control valve station includes an automatic control valve station and a manual control valve station arranged in parallel.

[0011] The automatic control valve platform includes: a reversing valve 18, a hydraulic check valve 20, and a throttle valve 19 connected in series.

[0012] The automatic control valve platform and the hydraulic servo valve platform 17 are connected in parallel to the stationary vane drive cylinder 21.

[0013] The manual control valve platform includes: a manual directional valve 23 and a manual end throttle valve 24 connected in series;

[0014] The manual control valve platform and the hydraulic servo valve platform 17 are connected in parallel to the stationary vane drive cylinder 21.

[0015] Furthermore, if the automatic control valve platform malfunctions, a manual control valve platform is used to connect to the stationary vane drive cylinder 21 to control the stationary vane 12 to switch on and off in the shutdown state.

[0016] Further, step S1 specifically includes:

[0017] The stroke of the stationary vane drive cylinder 21 is detected by a position sensor 22 located on one side of the stationary vane drive cylinder 21 to obtain a control signal;

[0018] The control signal is sent to the hydraulic servo valve console 17;

[0019] The hydraulic servo valve platform 17 converts the control signal into hydraulic oil flow, which drives the stationary vane drive cylinder 21 to control the opening degree of the stationary vane 12, thereby realizing the opening or closing action of the stationary vane 12 during simulated production.

[0020] Furthermore, the automatic control valve platform is connected to the stator drive cylinder 21 to control the automatic opening and closing of the stator 12 in the shutdown state, specifically including:

[0021] Set the opening range and action time period T of still leaf 12;

[0022] The position sensor 22 detects the opening degree of the stationary vane 12 and obtains a command to determine whether the stationary vane 12 is open or closed;

[0023] Based on the command to open or close the stationary vane 12, determine whether the directional valve 18 is energized in the opening or closing direction.

[0024] By energizing the reversing valve 18 in the opening or closing direction, the hydraulic line is connected, and the stationary vane drive cylinder 21 is pushed to open or close the stationary vane 12.

[0025] Among them, the still leaf 12 needs to maintain an open or closed state for a duration of T when it is open or closed.

[0026] Furthermore, a method for long-term shutdown maintenance of a blast furnace TRT also includes:

[0027] Step S3: Establish a nitrogen channel;

[0028] Step S4: When the blast furnace TRT is shut down for a long period of time, nitrogen is automatically introduced into the blast furnace gas pipeline 1 through the nitrogen channel to automatically maintain the pressure of the blast furnace gas pipeline 1.

[0029] Furthermore, establishing the nitrogen channel includes:

[0030] Nitrogen pipeline 6 is installed, with one end connected to blast furnace gas pipeline 1;

[0031] A nitrogen source 8 is provided and connected to the other end of the nitrogen gas pipeline 6;

[0032] A cut-off valve 7 is provided and connected to one end of the nitrogen gas pipeline 6 close to the nitrogen source 8;

[0033] A regulating valve 5 is provided and connected behind the cut-off valve 7 on the nitrogen gas pipeline 6.

[0034] Furthermore, in step S4, by judging the measured value of the pressure detection device 10 installed in the blast furnace gas pipeline 1, nitrogen gas is filled into the blast furnace gas pipeline 1.

[0035] Furthermore, step S4 specifically includes:

[0036] Two pressure values P1 and P2 are set in the pressure detection device 10

[0037] The pressure detection device 10 is used to detect the pressure measured value in the blast furnace gas pipeline 1;

[0038] The pressure measured value P of the pressure detection device 10 is read;

[0039] If P < P2, the cut-off valve 7 and the regulating valve 5 are opened, the nitrogen source 8 provides nitrogen gas, and nitrogen gas is filled into the blast furnace gas pipeline 1 connected to the blast furnace TRT through the nitrogen gas pipeline 6;

[0040] If P ≥ P1, the regulating valve 5 is closed, and the filling of nitrogen gas into the blast furnace gas pipeline 1 is stopped.

[0041] Furthermore, establishing the nitrogen gas channel further includes:

[0042] A blow-off pipeline 11 is provided, connected to the nitrogen gas pipeline 6 and connected between the cut-off valve 7 and the regulating valve 5;

[0043] A blow-off valve 9 is provided and connected to the blow-off pipeline 11.

[0044] The above technical solution has the following beneficial effects: Because the technical means of the production control action of the static blade 12 in the simulated production mode and the action of the static blade 12 in the non-simulated production mode are adopted, the technical effect of preventing the parts from rusting, deforming and jamming due to the rotation of the parts is achieved. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 This is a schematic diagram of the hydraulic principle of a stationary vane switch according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of the nitrogen gas supply and sewage discharge device in one embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the process of a servo valve controlling a stator switch in one embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the process of controlling the stationary vane switch by the reversing valve in one embodiment of the present invention;

[0050] The reference numerals in the attached figures are as follows:

[0051] 1. Blast furnace gas pipeline; 2. Turbine machine; 3. First butterfly valve; 4. First slide gate valve; 5. Regulating valve; 6. Nitrogen pipeline; 7. Shut-off valve; 8. Nitrogen source; 9. Vent valve; 10. Pressure detection device; 11. Vent pipeline; 12. Stationary vane; 13. Drainage pipeline; 14. Drainage valve; 15. Second slide gate valve; 16. Second butterfly valve; 17. Hydraulic servo valve platform; 18. Directional control valve; 19. Throttle valve; 20. Hydraulic control check valve; 21. Stationary vane drive cylinder; 22. Position sensor; 23. Manual directional control valve; 24. Manual throttle valve. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] The technical solutions of the present invention will be described in detail below with reference to specific application examples. For technical details not described in the implementation process, please refer to the relevant descriptions above.

[0054] The main control room houses a control system comprised of a computer (or PLC), control cabinets, and instrument cabinets. This system is used to start up and operate the blast furnace TRT (Transformer Refrigerator), monitor the operational status of various systems within the blast furnace TRT, and perform all operations and controls of the blast furnace TRT. These systems include the turbine system, power generation and distribution system, lubrication system, hydraulic servo control system, and water supply and drainage system. The blast furnace TRT control system primarily performs three functions: process control, sequence control, and process parameter monitoring. The human-machine interface within the control system consists of two operator stations. Engineers can use the operator stations for software programming and maintenance, while operators can use them to perform various operations and monitor the status of various indicators.

[0055] A method for long-term shutdown maintenance of a blast furnace TRT (Transmission Timing Unit) includes a control valve platform connected in parallel with a hydraulic servo valve platform 17 to a stationary vane drive cylinder. This allows for on / off control of the stationary vane 12 in two different modes. Specifically, the method includes:

[0056] Step S1: In simulated production mode, the stationary vane 12 is automatically controlled to move in the shutdown state by connecting the hydraulic servo valve platform 17 to the stationary vane drive cylinder 21, so that the stationary vane 12 achieves the effect of linear switching for a period of time.

[0057] Step S2: In non-simulated production mode, the stationary vane 12 is switched on and off in the shutdown state by controlling the valve platform connected to the stationary vane drive cylinder 21. In this mode, the stationary vane 12 can be fully opened or fully closed instantaneously.

[0058] The blast furnace TRT (Transmission Timer) primarily utilizes blast furnace gas to power the turbine at a speed of 3000 r / min, which in turn drives the generator to produce electricity. When the blast furnace TRT is shut down for an extended period, the blast furnace also ceases operation, resulting in no gas output. Consequently, the turbine cannot be powered, and electricity generation is impossible. During this period, production is not considered, and the system is considered shut down. In normal production, the opening of the stationary vane 12 is set by tracking the blast furnace top pressure. The servo valve in the hydraulic servo valve platform 17 then drives the stationary vane drive cylinder 21, thereby adjusting the stationary vane 12. When the blast furnace TRT is shut down, there is no top pressure. The program sets the opening range of the stationary vane 12, causing it to reciprocate, thus simulating actual production operations. This mode of simulating actual production operations is called the simulated production mode.

[0059] To more realistically simulate the actions in actual production and ensure that the stationary vane remains as consistent as possible with the production state even when the machine is stopped, the simulated production mode fully utilizes the components used in production to adjust the stationary vane 12. A hydraulic servo valve 17, used in production, is employed to regulate the opening and closing of the stationary vane 12. By controlling the key components through the simulated production mode, the main components are made to move, thereby preventing rust and deformation.

[0060] The hydraulic servo control function of the stationary blades in the blast furnace TRT unit mainly consists of the control system, electro-hydraulic servo controller, etc. in the blast furnace TRT unit. Figure 1 The hydraulic servo valve platform 17, the stator vane drive cylinder 21, and the position sensor 22, as shown, work together to achieve this. During production, the position sensor 22 detects the stroke of the stator vane drive cylinder 21, measures its position signal, and converts it into a corresponding electrical signal, sending it to the hydraulic servo controller as a feedback signal. Simultaneously, the hydraulic servo controller also receives command signals from the control system in the main control room. Internally, the hydraulic servo controller compares these two signals, and the difference reflects the gap between the expected position and the actual position. After processing, this difference generates a current signal that can drive the servo valve in the hydraulic servo valve platform 17, such as 4–20 mA DC (MOOG634 valve) or -60–60 mA DC (BD15 valve). Under the control of the servo valve, the hydraulic oil acts on the stator vane drive cylinder 21, driving the valve to the expected position, which in turn causes the stator vane 12 to reach the expected position, thus achieving the purpose of servo regulation.

[0061] The main structure of the servo valve in the hydraulic servo valve console 17 consists of a valve body, a valve core, a push rod, and an electromagnetic coil. The valve body and the valve core can form a closed cavity that is interconnected. The connection of the cavity changes depending on the position of the valve core. Through the through hole on the valve body and the oil pipe connected to the through hole, the direction of oil movement in the oil circuit changes. The position change of the valve core is controlled by the push rod. After the electromagnetic coil is energized, it generates a magnetic force to push the push rod, thereby moving the position of the valve core. In this way, the opening and closing of the hydraulic system oil circuit and the direction of oil movement can be controlled by controlling the current of the electromagnetic coil.

[0062] like Figure 1 As shown, the stationary vane drive cylinder 21 is connected to the hydraulic servo valve platform 17, and the stationary vane 12 is controlled by the stationary vane drive cylinder 21. The hydraulic servo system 17 is connected to the stationary vane drive cylinder 21 to control the opening and closing of the stationary vane 12. Since the control signal of the servo valve in the hydraulic servo system is generated by comparing and amplifying the position signal detected by the position sensor 22 with the command signal issued by the control system, the engineer can write a program in the control system to design how much the stationary vane 12 opens or closes within a certain time period. For example, it can be set to open the stationary vane from 20% to 40% within 5 seconds. This allows the stationary vane 12 to open or close linearly within a certain period of time.

[0063] Because the stationary vane 12 in the blast furnace TRT is linearly switched during actual production, the original hydraulic servo valve platform 17 in the blast furnace TRT is used in the simulated production mode. The program control in the control system realizes the simulated production action in the shutdown state. After the position sensor 22 measures the specified formation of the stationary vane drive cylinder, a feedback signal is generated. The feedback signal and the command signal issued by the control system generate a current signal. The current signal is transmitted to the servo valve in the hydraulic servo system 17. After the electromagnetic coil in the servo valve is energized, it generates magnetic force to push the push rod in the servo valve, causing the valve core position of the servo valve to move. By controlling the current of the electromagnetic coil in the servo valve, the opening and closing of the oil circuit and the direction of oil movement are controlled, and then the stationary vane 12 is switched by the stationary vane drive cylinder 21. The switching of the stationary vane 12 is controlled by the servo valve in the hydraulic servo valve console 17. The control signal of the servo valve is related to the feedback signal of the position sensor 22. The measurement value of the position sensor 22 may have a small error. This error prevents the stationary vane 12 from reaching the fully open or fully closed position. Moreover, in actual production, the stationary vane 12 usually does not reach the fully open or fully closed position, but is basically between 30% and 80%. Therefore, in addition to the switching action of the stationary vane 12 in the simulated production mode, the action of the stationary vane 12 in the non-simulated production mode is also designed, that is, the stationary vane 12 can achieve the action of instantaneous full opening or instantaneous full closing. This operation can ensure that the stationary vane 12 will not be blocked due to machine stoppage.

[0064] In the non-simulated production mode, a new control valve station is added. The control system sends a control signal to the control valve station. After receiving the signal, the control valve station changes the direction of oil movement in the oil circuit, which in turn changes the stroke of the stationary vane drive cylinder 21. The stroke change of the stationary vane drive cylinder 21 drives the stationary vane 12 switch to operate in the controlled shutdown state, so as to realize the instantaneous full opening or instantaneous full closing of the stationary vane 12 switch.

[0065] In the simulated production mode, the original hydraulic servo valve console 17 is used, while in the non-simulated production mode, a new control console is used. The hydraulic servo valve console 17 and the control valve console are connected in parallel. The simulated production mode or the non-simulated production mode can be manually selected according to the actual needs through manual operation. The two modes are executed independently.

[0066] Further, step S2 specifically includes:

[0067] Establish a control valve platform;

[0068] The control valve station includes an automatic control valve station and a manual control valve station arranged in parallel.

[0069] The automatic control valve platform includes: a reversing valve 18, a hydraulic check valve 20, and a throttle valve 19 connected in series.

[0070] The automatic control valve platform and the hydraulic servo valve platform 17 are connected in parallel to the stationary vane drive cylinder 21.

[0071] The manual control valve platform includes: a manual directional valve 23 and a manual end throttle valve 24 connected in series;

[0072] The manual control valve platform and the hydraulic servo valve platform 17 are connected in parallel to the stationary vane drive cylinder 21.

[0073] like Figure 1 As shown, the stationary vane 12 is connected to the reversing valve 18 and the throttle valve 19 in the automatic control valve console. When the stationary vane 12 is in the stopped state, the reversing valve 18 and the throttle valve 19 adjust the stroke and action of the stationary vane drive cylinder 21, thereby driving the opening and closing of the stationary vane 12.

[0074] like Figure 1 As shown, the directional valve 18 in the automatic control valve console of this embodiment is a Y-type electromagnetic directional valve.

[0075] The electromagnetic directional valve has a sealed chamber with through holes at different positions, each connecting to a different oil pipe. A piston is located in the center of the chamber, and two electromagnets are located at either end. When the coil of one electromagnet is energized, the valve body is attracted to that end. By controlling the movement of the valve body, different drain holes are opened or closed. The inlet hole is always open, allowing hydraulic oil to enter different drain pipes. The oil pressure then pushes the piston of the stator drive cylinder 21, which in turn drives the piston rod, which in turn drives the stator 12 to open and close. Therefore, the opening and closing of the stator 12 can be controlled by controlling the current to the electromagnets.

[0076] To achieve instantaneous full opening or full closing of the stationary vane 12, thus resolving the jamming issue caused by blast furnace TRT shutdown, a control valve platform is designed. The manual and automatic control valve platforms are connected in parallel, with one operating manually. The manual directional valve 23 uses a lever principle to move the valve core within the valve body to achieve directional switching. The directional valve 18 is an electromagnetic directional valve, operated by the attraction of an electromagnet. When the electromagnet is energized, it attracts the armature, pushing the valve core within the valve body to achieve directional switching. Both the manual directional valve 23 and the automatic directional valve 18 in the manual control platform can achieve instantaneous full opening or full closing of the stationary vane. When either the manual directional valve 23 or the directional valve 18 is energized, the hydraulic line is connected, and the oil circuit pushes the stationary vane drive cylinder 21 to move, thereby causing the stationary vane 12 to instantly open or close.

[0077] Furthermore, if the automatic control valve platform malfunctions, a manual control valve platform is used to connect to the stationary vane drive cylinder 21 to control the stationary vane 12 to switch on and off in the shutdown state.

[0078] The manual control valve and the automatic control valve are switched by manual operation. During normal operation, the automatic control valve works. When the automatic control valve malfunctions, the control valve program fails, and the operator manually operates the manual directional valve 23 of the manual control valve. The manual control valve is connected to the stationary vane drive cylinder 21, thereby controlling the opening and closing of the stationary vane 12 in the shutdown state.

[0079] Further, step S1 specifically includes:

[0080] A control signal is obtained by detecting the stroke of the stationary vane drive cylinder 21 using a position sensor 22 located on one side of the stationary vane drive cylinder 21;

[0081] The control signal is sent to the hydraulic servo valve console 17;

[0082] The hydraulic servo valve platform 17 converts the control signal into hydraulic oil flow, which drives the stationary vane drive cylinder 21 to control the opening degree of the stationary vane 12, thereby realizing the opening or closing action of the stationary vane 12 during simulated production.

[0083] like Figure 3 As shown, the opening range XY of the stationary vane 12 is set; the position sensor 22 detects the stroke of the stationary vane drive cylinder 21; when the stroke of the stationary vane drive cylinder 21 is greater than X, the position sensor 22 obtains a control signal and sends the control signal to the hydraulic servo controller. At the same time, the hydraulic servo controller also receives the position signal command issued by the control system. After processing the two signals, the hydraulic servo controller obtains a current signal and sends it to the hydraulic servo valve platform 17. The servo valve in the hydraulic servo valve platform 17 receives the current signal, converts the current signal into hydraulic oil flow, drives the stationary vane drive cylinder 21, thereby controlling the opening of the stationary vane 12, opening the stationary vane 12. At the same time, the timer program in the control system starts the timer to start timing. The action of opening the stationary vane 12 is completed within S time. After S time, the stationary vane 12 opens to the specified opening Y, and the timer program in the control system pauses the timer. After the position sensor 22 detects that the stroke of the stationary vane drive cylinder 21 has reached Y, the position sensor 22 obtains a control signal and sends the control signal to the hydraulic servo controller. At the same time, the control system issues a command signal. The hydraulic servo controller processes the two signals to obtain a control signal to connect the return oil circuit. This control signal is transmitted to the hydraulic servo valve platform 17. The servo valve in the hydraulic servo valve platform 17 receives the control signal and converts the control signal into hydraulic oil flow to drive the stationary vane drive cylinder 21, thereby controlling the opening degree of the stationary vane 12 and closing the stationary vane 12 from Y. The timer program in the control system starts the timer, and the timer counts down from S. When the timer counts down to 0, the stroke of the stationary vane drive cylinder 21 returns to X, that is, the opening degree of the stationary vane 12 is closed to X. The timer program in the control system pauses the countdown, thus completing one opening and closing process of the stationary vane 12 in production mode.

[0084] The position sensor 22 detects the stroke of the stationary vane drive cylinder 21 in real time to complete one opening and closing action of the stationary vane 12. The position sensor 22 continuously detects the stroke of the stationary vane drive cylinder 21. The X and Y values ​​are used as the control signal trigger points. The control signal fed back by the position sensor 22 and the command signal issued by the control system are processed and act on the hydraulic servo valve platform 17. The action time is controlled by the timer program in the control system. The stationary vane 12 keeps opening and closing in a cycle until the control system issues an end command, the cycle ends, and the stationary vane 12 stops moving.

[0085] Furthermore, the automatic control valve platform is connected to the stator drive cylinder 21 to control the automatic opening and closing of the stator 12 in the shutdown state, specifically including:

[0086] Set the opening range and action time period T of still leaf 12;

[0087] The position sensor 22 detects the opening degree of the stationary vane 12 and obtains a command to determine whether the stationary vane 12 is open or closed;

[0088] Based on the command to open or close the stationary vane 12, determine whether the directional valve 18 is energized in the opening or closing direction.

[0089] By energizing the reversing valve 18 in the opening or closing direction, the hydraulic line is connected, and the stationary vane drive cylinder 21 is pushed to open or close the stationary vane 12.

[0090] Among them, the still leaf 12 needs to maintain an open or closed state for a duration of T when it is open or closed.

[0091] In non-simulated production mode, such as Figure 4As shown, the opening range of the stationary vane 12 is set to xy. The position sensor 22 detects the stroke of the stationary vane drive cylinder 21. Since the stationary vane 12 is driven by the stationary vane drive cylinder 21, the stroke value of the stationary vane drive cylinder is equal to the opening value of the stationary vane 12. When the position sensor 22 detects that the stroke of the stationary vane drive cylinder 21 is x, the position sensor 22 sends a feedback signal to the control system. After receiving the feedback signal from the position sensor 22, the control system sends a command signal. The command signal energizes the directional valve 18 in the automatic control valve console, causing the valve body in the directional valve 18 to be attracted to the energized end of the electromagnet, instantly opening the stationary vane 12. The timer program in the control system starts the timer. Since the directional valve 18 is an electromagnetic directional valve, the stationary vane 12 is in a fully open state at this time, that is, the stroke of the stationary vane drive cylinder 21 reaches y. When the timer counts to T, the timer program in the control system pauses the counting. At the same time, the control system sends a command signal to change the current on / off of the directional valve 18, thereby changing the direction of the valve body in the directional valve 18. The stroke of the stationary vane drive cylinder 21 returns to x, and the stationary vane 12 closes instantly, with the stationary vane 12 in a fully closed state. The timer program in the control system starts the timer, which counts down from time T. When the timer counts down to 0, the control system sends another command signal. The directional valve 18 in the automatic control valve console receives the command signal, and the movement direction of the valve body of the directional valve 18 changes. The stroke of the stationary vane drive cylinder 21 returns to y. Through the control of the control system, a command signal is sent to repeatedly change the movement direction of the valve body in the directional valve 18 in the automatic control valve console, pushing the stationary vane drive cylinder 21 to repeatedly open and close the stationary vane 12 until the control system sends a program end command, the automatic control valve console stops working, and the stationary vane 12 also stops its opening and closing action.

[0092] During the switching of the stationary vane 12, the throttle valve 19 and the hydraulic check valve 20 in the automatic control valve console remain in the on state and do not require operation.

[0093] When the automatic control valve console malfunctions, the operator will manually operate the manual control valve console to control the manual directional valve 23. Manually operating the handle of the manual directional valve 23 moves the valve body, thereby controlling the stroke of the stationary vane drive cylinder to open or close the stationary vane 12. During manual operation, the stationary vane 12 also switches between fully open and fully closed states. During the opening and closing of the stationary vane 12, the manual end throttle valve 24 in the manual control valve console remains in the energized state and requires no operation.

[0094] Furthermore, a method for long-term shutdown maintenance of a blast furnace TRT also includes:

[0095] Step S3: Establish a nitrogen channel;

[0096] Step S4: When the blast furnace TRT is shut down for a long period of time, nitrogen is automatically introduced into the blast furnace gas pipeline 1 through the nitrogen channel to automatically maintain the pressure of the blast furnace gas pipeline 1.

[0097] like Figure 2 As shown, turbine 2 is connected to blast furnace gas pipeline 1. The blast furnace gas pipeline is equipped with a first butterfly valve 3, a first slide gate valve 4, a second butterfly valve 16, a second slide gate valve 15, and a pressure detection device 10. A nitrogen pipeline 6 is connected before turbine 2. The nitrogen pipeline 6 is equipped with a regulating valve 5 and a shut-off valve 7. Venting pipeline 11 is connected to nitrogen pipeline 6 and is equipped with a venting valve 9.

[0098] The establishment of the nitrogen channel includes:

[0099] Nitrogen pipeline 6 is installed, with one end connected to blast furnace gas pipeline 1;

[0100] A nitrogen source 8 is provided and connected to the other end of the nitrogen pipeline 6;

[0101] A shut-off valve 7 is provided and connected to one end of the nitrogen pipeline 6 near the nitrogen source 8;

[0102] A regulating valve 5 is installed downstream of the shut-off valve 7 on the nitrogen pipeline 6.

[0103] By establishing a nitrogen channel, nitrogen is introduced into the blast furnace gas pipeline 1 to automatically maintain the pressure of the blast furnace gas pipeline 1, providing an inert gas environment and delaying the corrosion of the equipment.

[0104] Further, in step S4, nitrogen gas is introduced into the blast furnace gas pipeline 1 by judging the measured value of the pressure detection device 10 installed in the blast furnace gas pipeline 1.

[0105] like Figure 2 As shown, the first butterfly valve 3, the first slide gate valve 4, the second butterfly valve 16, and the second slide gate valve 15 are closed, and the shut-off valve 7 and the regulating valve 5 are automatically opened to charge an appropriate amount of nitrogen into the turbine 2, automatically maintaining the pressure of the blast furnace gas pipeline 1. The pressure of the blast furnace gas pipeline 1 can be determined by the measurement value of the pressure detection device 10, and the pressure value determines whether nitrogen needs to be introduced into the pipeline.

[0106] Further, step S4 specifically includes:

[0107] Two pressure values, P1 and P2, are set in the pressure detection device 10.

[0108] The pressure measurement value in the blast furnace gas pipeline 1 is detected using the pressure detection device 10;

[0109] Read the pressure measurement value P from the pressure detection device 10;

[0110] If P < P2, open the cut-off valve 7 and the regulating valve 5. The nitrogen source 8 supplies nitrogen, and nitrogen is filled into the blast furnace gas pipeline 1 connected to the blast furnace TRT through the nitrogen pipeline 6;

[0111] If P ≥ P1, close the regulating valve 5 and stop filling nitrogen into the blast furnace gas pipeline 1.

[0112] By comparing the detected value of the pressure detection device 10 with the set pressure value, it is judged when nitrogen needs to be introduced. The set pressure values are P1 and P2, and P1 > P2. When the pressure is between P1 and P2, it means the pressure is normal; when it is less than P2, the pressure is too small, indicating insufficient nitrogen, and nitrogen needs to be increased. As the nitrogen increases, the pressure also increases. When the pressure is greater than P1, it means the pressure is too large. If nitrogen is further increased, the blast furnace gas pipeline 1 may be in a high-pressure state, which is dangerous. At this time, nitrogen should not be introduced anymore, and the cut-off valve 7 and the regulating valve 5 should be closed.

[0113] Furthermore, establishing the nitrogen channel further includes:

[0114] A blow-off pipeline 11 is provided, which is connected to the nitrogen pipeline 6 and is connected between the cut-off valve 7 and the regulating valve 5;

[0115] A blow-off valve 9 is provided and connected to the blow-off pipeline 11.

[0116] When the pressure of the blast furnace gas pipeline 1 is too high, the pressure is reduced by opening the blow-off valve 9 and discharging nitrogen from the blow-off pipeline 11. If the blast furnace TRT needs to be started and put into normal production after a long-term shutdown, the blow-off valve 9 also needs to be opened to discharge nitrogen from the blow-off pipeline 11.

[0117] In the long-term shutdown state of the blast furnace TRT, although the blast furnace TRT is shut down, there will still be dust in the blast furnace gas pipeline 1. Due to the large day-night temperature difference, condensate will be generated on the pipe wall of the blast furnace gas pipeline 1 and there is also condensate in the casing. Regular sewage discharge and nitrogen injection can keep the blast furnace gas pipeline and the casing dry. As Figure 2 shown, a sewage pipeline 13 is installed at the lower part of the turbine 2, and a sewage valve 14 is installed on the sewage pipeline 13. When the blast furnace TRT is shut down for a long time, the sewage discharge method is as follows: Manually open the sewage valve 14 installed on the sewage pipeline 13 regularly every week for a sewage maintenance of the inside of the blast furnace TRT. [[ID=二十五]]

[0118] When the blast furnace TRT is shut down for extended periods, a production control program in simulated production mode can be used to simulate the operation of the stationary blade 12 during normal production. The stationary blade 12 switch can also be set to be fully open or fully closed in non-simulated production mode. This prevents rusting, deformation, and jamming of components caused by prolonged shutdown. By introducing nitrogen gas, the blast furnace gas pipeline 1 within the blast furnace TRT is automatically pressurized. The inert gas environment slows down internal equipment corrosion. Combined with regular venting of the internal equipment and the nitrogen environment, the interior of the blast furnace TRT remains dry, further reducing the risk of corrosion and rust. These methods provide effective maintenance for the blast furnace TRT during long-term shutdowns.

[0119] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0120] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0121] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0122] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0123] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for long-term shutdown maintenance of a blast furnace TRT, characterized in that, A control valve platform is set up, and the control valve platform and the hydraulic servo valve platform (17) are connected in parallel to the stationary vane drive cylinder (21) to realize the on / off control of the stationary vane (12) in two different modes. The long-term shutdown maintenance method of the blast furnace TRT also specifically includes: Step S1: In the simulated production mode, the stationary blade (12) is automatically controlled by the hydraulic servo valve platform (17) connected to the stationary blade drive cylinder (21) in the shutdown state, so that the stationary blade (12) can achieve the effect of linear opening or closing within a period of time. When the blast furnace TRT is shut down, there is no top pressure. The stationary blade opening range is set by the program to make the stationary blade reciprocate, thereby simulating the actual production action. The mode of simulating the actual production action is called the simulated production mode. Step S2: In non-simulated production mode, the stationary vane (12) is controlled by connecting the control valve station to the stationary vane drive cylinder (21) in the shutdown state. In this mode, the stationary vane (12) can be fully opened or fully closed instantaneously. The operation in non-simulated production mode, that is, the action of the stationary blades to open or close instantly, ensures that the stationary blades will not be blocked due to machine stoppage.

2. The method for long-term shutdown maintenance of a blast furnace TRT as described in claim 1, characterized in that, Step S2 specifically includes: Establish a control valve platform; The control valve station includes an automatic control valve station and a manual control valve station arranged in parallel. The automatic control valve platform includes: a reversing valve (18), a hydraulic check valve (20), and a throttle valve (19) connected in series. The automatic control valve platform and the hydraulic servo valve platform (17) are connected in parallel to the stationary vane drive cylinder (21). The manual control valve platform includes: a manual directional valve (23) and a manual end throttle valve (24) connected in series. The manual control valve platform and the hydraulic servo valve platform (17) are connected in parallel to the stationary vane drive cylinder (21).

3. The method for long-term shutdown maintenance of a blast furnace TRT as described in claim 2, characterized in that, If the automatic control valve platform malfunctions, the manual control valve platform is connected to the stationary vane drive cylinder (21) to control the stationary vane (12) to switch on and off in the shutdown state.

4. The method for long-term shutdown maintenance of a blast furnace TRT as described in claim 1, characterized in that, Step S1 specifically includes: The stroke of the stationary vane drive cylinder (21) is detected by a position sensor (22) located on one side of the stationary vane drive cylinder (21) to obtain a control signal; The control signal is sent to the hydraulic servo valve station (17). The hydraulic servo valve platform (17) converts the control signal into hydraulic oil flow, which drives the stationary vane drive cylinder (21) to control the opening degree of the stationary vane (12) and realize the opening or closing action of the stationary vane (12) during simulated production.

5. A method for long-term shutdown maintenance of a blast furnace TRT as described in claim 2, characterized in that, The automatic control valve platform is connected to the stationary vane drive cylinder (21) to control the automatic opening and closing of the stationary vane (12) in the shutdown state, specifically including: Set the opening range and action time period T of the still leaf (12); The position sensor (22) detects the opening degree of the stationary vane (12), determines whether the stationary vane (12) is open or closed, and generates a command to determine whether the stationary vane (12) is open or closed; Based on the command to open or close the stationary vane (12), determine the energizing direction of the reversing valve (18) to open or close. By opening or closing the directional valve (18), the hydraulic line is controlled to open or close, and the stationary vane drive cylinder (21) is pushed to open or close the stationary vane (12); Among them, the static blade (12) needs to maintain the open or closed state for a duration of T when opening or closing.

6. A method for long-term shutdown maintenance of a blast furnace TRT as described in claim 1, characterized in that, It further includes: Step S3: Establish a nitrogen gas channel; Step S4: When the blast furnace TRT is shut down for a long time, nitrogen gas is automatically introduced into the blast furnace gas pipeline (1) through the nitrogen gas channel to automatically maintain the pressure of the blast furnace gas pipeline (1).

7. A method for long-term shutdown maintenance of a blast furnace TRT as described in claim 6, characterized in that, The establishment of the nitrogen gas channel includes: Setting a nitrogen gas pipeline (6), with one end connected to the blast furnace gas pipeline (1); Setting a nitrogen gas source (8), connected to the other end of the nitrogen gas pipeline (6); Setting a cut-off valve (7), connected to one end of the nitrogen gas pipeline (6) close to the nitrogen gas source (8); Setting a regulating valve (5), connected behind the cut-off valve (7) on the nitrogen gas pipeline (6).

8. A method for long-term shutdown maintenance of a blast furnace TRT as described in claim 7, characterized in that, In step S4, nitrogen gas is filled into the blast furnace gas pipeline (1) by judging the measured value of the pressure detection device (10) installed in the blast furnace gas pipeline (1).

9. A method for long-term shutdown maintenance of a blast furnace TRT according to claim 8, characterized in that Specifically, it includes: Setting two pressure values P1 and P2 in the pressure detection device (10) Using the pressure detection device (10) to detect the pressure measured value in the blast furnace gas pipeline; Reading the pressure measured value P of the pressure detection device (10); If P < P2, open the cut-off valve (7) and the regulating valve (5), the nitrogen gas source (8) provides nitrogen gas, and nitrogen gas is filled into the turbine (2) connected to the blast furnace gas pipeline (1) in the blast furnace TRT through the nitrogen gas pipeline (6); If P ≥ P1, close the regulating valve (5) and stop filling nitrogen gas into the turbine (2).

10. A method for long-term shutdown maintenance of a blast furnace TRT as described in claim 7, characterized in that, The establishment of the nitrogen gas channel further includes: Setting a blow-off pipeline (11), connected to the nitrogen gas pipeline (6) and connected between the cut-off valve (7) and the regulating valve (5); Setting a blow-off valve (9), connected to the blow-off pipeline (11).

Images