Automatic control method for constant-pressure furnace change of blast furnace hot blast stove

Abstract

The invention discloses an automatic control method for constant-pressure furnace changing of a blast furnace hot blast stove. The automatic control method comprises the following steps that S1, communication between the blast furnace hot blast stove and an air blower PLC system is established; s2, when a hot-blast stove PLC compiles a program and changes a stove, a stove changing signal is given and output to an I / O module of the air blower system through a relay, and a constant-voltage automatic stove changing input operation picture is configured in the hot-blast stove system; s3, a program is compiled in an air blower control system, after a furnace changing signal of a hot blast stove system is received, the opening degree of a static blade of an air blower is automatically adjusted through a PID control program, the air pressure is stabilized, and the air pressure and the air volume in the furnace changing period are kept consistent with those before furnace changing; and S4, constant-pressure furnace changing operation is achieved through PID automatic adjustment. Constant-pressure full-automatic furnace changing is adopted, blast furnace pressure fluctuation cannot be caused by hot blast furnace changing, the service life of the hot blast furnace is prolonged, the compensation air volume is accurately and automatically adjusted through the opening degree of the blast static blade, the improvement cost is low, and the method is economical and applicable and can be popularized in multiple production processes.

Description

Technical Field

[0001] The invention relates to the technical field related to blast furnace hot blast stoves, and in particular to an automatic control method for constant pressure furnace change of blast furnace hot blast stoves. Background Art

[0002] Blast furnaces in iron and steel plants are generally equipped with three hot blast furnaces, which adopt the "two burning and one sending" system. There are seven working states in total, namely, burning furnace, burning furnace to stewing furnace, stewing furnace, stewing furnace to sending air, sending air, sending air to stewing furnace, stewing furnace to burning furnace, etc. A continuous supply of hot air is provided to the blast furnace. When a hot blast furnace has been sending air for a period of time, the output hot air cannot maintain the required temperature, and the furnace needs to be replaced, and another hot blast furnace with combustion and heating is used to send air; and the original hot blast furnace that sends air is switched to re-combustion and heating.

[0003] The existing hot blast furnace has the following shortcomings when in use: (1) When the hot blast furnace is replaced, the working state of one of the furnaces will be changed from "burning furnace" to "air supply". The working state of the furnace that is supplying air is "air supply". When the furnace is changed from "burning furnace" to "air supply", the gas flow regulating valve and the shut-off valve are closed first, and then the combustion valve is closed, and then the air regulating valve and the shut-off valve are closed. The gas purge valve is opened and closed after a delay of several seconds, and the flue valve is closed. The pressure charging valve is opened for pressure charging, and cold air is poured into the furnace to reduce the pressure in the furnace. However, since the pressure in the furnace is close to zero during the furnace burning, the pressure difference between the inside and outside of the furnace is very large, and the cold air is quickly filled into the furnace. At the same time, the cold air in the pipeline that originally supplied a fixed air volume to one hot blast furnace is now distributed to two hot blast furnaces, which is bound to cause a rapid drop in air pressure. As a result, the air pressure fluctuates greatly when the hot blast furnace is replaced, and the cold air flow control is unstable, causing disturbances in the blast furnace condition, thereby affecting the output quality of the blast furnace; (2) When the hot air furnace is burning, smoke is generated and transported to the filter box through the smoke dust pipe for filtering. After long-term use, the surface of the internal filter of the traditional filter device will accumulate impurities, which will clog the filter and affect the speed of exhausting smoke from the filter device, thereby reducing the working efficiency of the filter device. Summary of the invention

[0004] The object of the present invention is to provide a constant pressure furnace changing automatic control method for a blast furnace hot blast stove to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for automatically controlling a constant pressure furnace change of a blast furnace hot blast stove, comprising the following steps: S1: Establish communication between the blast furnace hot blast stove and blower PLC system; S2: Compile the program in the hot blast furnace PLC, give the furnace change signal when changing the furnace, and output it to the blower system I / O module through the relay, and configure the constant pressure automatic furnace change operation screen in the hot blast furnace system; S3: compile a program in the blower control system, and after receiving the hot air furnace system furnace change signal, automatically adjust the blower static blade opening through the PID control program to stabilize the wind pressure, and keep the wind pressure and air volume during the furnace change consistent with those before the furnace change; S4: Realize constant pressure furnace changing operation through PID automatic adjustment.

[0006] Preferably, in step S3, the PID control procedure comprises the following steps: S31: The hot air furnace starts to change and sends a signal to the blower PLC system through hard-wire communication; S32: The blower system receives the furnace change signal and assigns the blower exhaust side pressure to the adjustment set value P1; S33: Obtain a furnace change start signal, assign the fan stator blade PID parameter to an initial fixed value, and set the exhaust side pressure to a measured input value P2; S34: 30 seconds after the furnace change starts, according to the exhaust side pressure P1 at the beginning of the furnace change and the exhaust side pressure P2 during the furnace change, the stator blade opening is automatically adjusted through the initial fixed PID parameters, and the upper and lower limits of the stator blade adjustment are limited to between 55° and 75°; S35: After 30 seconds, the proportional and integral effects of PID parameters are reduced, the adjustment oscillation is eased, the upper and lower limits of the adjustment parameters are cancelled, the stator blade adjustment enters the fully automatic PID continuous control, and the stator blade opening is automatically adjusted according to the difference in the exhaust side pressure change; S36: The hot air furnace gives a furnace change end signal, the above PID control stops, and the constant pressure automatic adjustment is exited.

[0007] The present invention also provides a constant pressure furnace changer for a blast furnace hot blast furnace, comprising a furnace body, a blower is arranged on one side of the furnace body, and a smoke duct is fixedly connected to the furnace body; One end of the smoke and dust duct is fixedly connected to a filter box, a filter screen is fixedly installed inside the filter box, and a cleaning device is arranged inside the filter box, and the cleaning device includes: A cleaning mechanism, wherein the cleaning mechanism is arranged on both sides of the filter screen; A driving mechanism, which is arranged inside the filter box and is used to move the cleaning mechanism in a vertical direction; A knocking mechanism, which is arranged on the cleaning mechanism and is used for intermittently knocking the filter screen; A water spraying mechanism, which is arranged on the cleaning mechanism and is used to spray water on the filter screen intermittently; The swing mechanism is arranged on one side of the filter box and is used to evenly adjust the wind direction.

[0008] Preferably, the cleaning mechanism comprises: A movable plate, wherein a plurality of movable plates are symmetrically arranged with the filter screen as the center; A cleaning plate, wherein a cleaning groove is provided on one side of the movable plate close to the filter screen, and the cleaning plate is slidably interlaced with the inner cavity of the cleaning groove; A limit block, both sides of the cleaning groove are provided with limit grooves, the limit block is slidably connected with the inner cavity of the limit groove, and the limit block is fixedly connected with the cleaning plate; A first compression spring is arranged inside the cleaning groove, one end of the first compression spring is fixedly connected to the cleaning plate, and the other end of the first compression spring is fixedly connected to the inner wall of the cleaning groove.

[0009] Preferably, the driving mechanism comprises: A protective shell, wherein the protective shell is fixedly connected to the top of the filter box; A motor, wherein the motor is fixedly mounted on the top of the protective shell; A driving rod, the driving rod is rotatably arranged inside the filter box, the driving rod and the cleaning plate form a lead screw transmission, and the output end of the motor is drivingly connected to one end of the driving rod; A slide rod, the slide rod being fixedly connected to the inner wall of the filter box; A rotating rod, the rotating rod being rotatably disposed between the protective shell and the filter box; The transmission member is arranged inside the protective shell and is used to drive the driving rod and the rotating rod to rotate synchronously.

[0010] Preferably, the driving mechanism further comprises: A first rack, a groove is formed on one side of the slide bar close to the filter screen, and the first rack is fixedly connected to the inside of the groove; A linkage rod, the linkage rod being rotatably disposed inside the moving plate; The first gear is fixedly connected with the linkage rod through insertion, and the first gear is meshingly connected with the first rack.

[0011] Preferably, the knocking mechanism comprises: The rotating disk, the movable plate is symmetrically provided with a plurality of through slots, the linkage rod is rotatably interlaced with the inner cavity of the through slots, and the rotating disk is fixedly interlaced with the linkage rod; Extrusion plates, a plurality of the extrusion plates are fixedly connected to the outer wall of the rotating disk at equal intervals; An extrusion rod, the extrusion rod is rotatably disposed inside the through slot; A knocking ball, wherein the knocking ball is fixedly connected to one end of the extrusion rod, and the extrusion plate cooperates with the other end of the extrusion rod; A tension spring, one end of which is fixedly connected to the movable plate, and the other end of which is fixedly connected to the extrusion rod.

[0012] Preferably, the water spraying mechanism comprises: An eccentric wheel, a plurality of extrusion grooves are equidistantly provided on the movable plate, the linkage rod is rotatably interlaced with the inner cavity of the extrusion groove, the eccentric wheel is located inside the extrusion groove, and the eccentric wheel is fixedly interlaced with the linkage rod; A C-shaped plate, the C-shaped plate is located inside the extrusion groove, and the eccentric wheel cooperates with the inner cavity of the C-shaped plate; An airbag, wherein the airbag is fixedly connected between the C-shaped plate and the inner wall of the extrusion groove; A mounting seat, the mounting seat is fixedly connected to the top of the movable plate, and the air outlet end of the airbag is fixedly interlaced with the mounting seat; A high-pressure nozzle, the high-pressure nozzle is fixedly mounted on a side of the mounting base close to the filter screen; A bellows, the bellows is fixedly connected to the top of the mounting seat, the other end of the bellows is fixedly connected to the top of the filter box, and a one-way valve is provided on the high-pressure nozzle and the bellows; A water inlet pipe is provided on one side of the filter box. One end of the water inlet pipe is fixedly connected to the corrugated pipe, and the other end of the water inlet pipe is fixedly connected to the water tank.

[0013] Preferably, the swing mechanism comprises: An air inlet pipe, the air inlet pipe is fixedly connected to one side of the inner wall of the filter box; Air inlet plates, a plurality of said air inlet plates are equidistantly rotated by a rotating shaft and arranged inside the air inlet pipe; The swing assembly is connected to the rotating rod and is used to drive the air inlet plate to swing back and forth.

[0014] Preferably, the swing assembly comprises: A second gear, the second gear is fixedly interlaced with the rotating shaft; A sleeve, wherein the sleeve is fixedly connected to the bottom end of the inner wall of the filter box; A telescopic rod, one end of which is slidably connected to the inner cavity of the sleeve; A second rack, wherein the second rack is fixedly connected to the telescopic rod, and the second gear is meshingly connected to the second rack; A rotating block, the rotating block is fixedly connected with the rotating rod, a lifting groove is provided at the bottom end of the rotating block, a ball is provided inside the other end of the telescopic rod, and the ball cooperates with the lifting groove; A second compression spring, wherein the second compression spring is located inside the sleeve, one end of the second compression spring is fixedly connected to the telescopic rod, and the other end of the second compression spring is fixedly connected to the inner wall of the sleeve.

[0015] Technical effects and advantages of the present invention: (1) The automatic control method of the present invention can realize fully automatic unmanned operation, stabilize the thermal load of hot air, adopt constant pressure full-automatic furnace change, the hot blast furnace change will not cause the blast furnace pressure fluctuation, the hot blast furnace only needs to ensure the blast temperature of the blast furnace, stabilize the thermal load of the hot air, extend the service life of the hot blast furnace, and increase the blast temperature. After adopting constant pressure full-automatic furnace change, the furnace burning time can be extended, the air supply time can be appropriately shortened, the air supply temperature can be increased, and the output can be increased. After adopting constant pressure full-automatic furnace change, the furnace condition is stable and smooth, which can increase production and reduce consumption. The blast furnace blower of our factory has surplus air volume and can achieve full load operation. The output can be greatly increased, effectively solving the technical problem of unstable air supply pressure during the blast furnace hot blast furnace change, ensuring the stability of hot air volume and air pressure, and the blast furnace condition is not disturbed, the molten iron output is increased, and energy is also saved. The technology compensates the air volume by accurately and automatically adjusting the opening of the blast stator blades. The transformation cost is low, economical and applicable, and can be promoted in multiple production processes; (2) The present invention utilizes a cleaning mechanism, a driving mechanism, a knocking mechanism, a water spraying mechanism and a swinging mechanism in a coordinated arrangement. When the filter plate filters the smoke gas generated by the furnace body, the driving mechanism can drive the movable plate to move back and forth in the vertical direction. The knocking mechanism can knock the frame of the filter screen while cleaning, so that the dust agglomerated on the filter screen is loosened and broken. The water spraying mechanism can intermittently spray water on the filter screen, so that the cleaning plate can clean the filter screen more easily, thereby ensuring the exhaust quality and efficiency of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flow chart of the automatic control of constant pressure furnace changeover of the hot blast stove of a blast furnace.

[0017] Figure 2 It is the flow chart of PID control program of the present invention.

[0018] Figure 3 This is a block diagram of the PID control principle of the present invention.

[0019] Figure 4 This is a schematic diagram of the application of PID automatic control combined with program control in the present invention.

[0020] Figure 5 It is a structural schematic diagram of the hot blast furnace of the present invention.

[0021] Figure 6 This is a schematic diagram of the internal structure of the filter box at the front of the present invention.

[0022] Figure 7 This is a schematic diagram of the internal structure of the cleaning mechanism of the present invention from the front.

[0023] Figure 8 It is a schematic diagram of the internal structure of the movable plate of the present invention when viewed from above.

[0024] Fig. 9 It is a schematic diagram of the top view of the transmission part of the present invention.

[0025] Fig.10 It is a schematic diagram of the internal structure of the striking mechanism of the present invention from the front.

[0026] Fig.11 It is a front structural schematic diagram of the eccentric wheel of the present invention.

[0027] Fig.12 It is a schematic diagram of the top view of the water spray mechanism of the present invention.

[0028] Fig.13 It is a schematic diagram of the internal structure of the back side of the swing assembly of the present invention.

[0029] In the figure: 1, furnace body; 2, blower; 3, smoke duct; 4, filter box; 5, cleaning mechanism; 51, moving plate; 52, cleaning plate; 53, limit block; 54, first compression spring; 6, driving mechanism; 61, protective shell; 62, motor; 63, driving rod; 64, sliding rod; 65, rotating rod; 66, transmission member; 67, first rack; 68, linkage rod; 69, first gear; 7, knocking mechanism; 71, turntable; 72, extrusion plate; 73, extrusion rod; 74, knocking Batting; 75, tension spring; 8, water spraying mechanism; 81, eccentric wheel; 82, C-shaped plate; 83, air bag; 84, mounting seat; 85, high-pressure nozzle; 86, bellows; 87, water inlet pipe; 9, swinging mechanism; 91, air inlet pipe; 92, air inlet plate; 93, swinging assembly; 931, second gear; 932, sleeve; 933, telescopic rod; 934, second rack; 935, rotating block; 936, ball bearing; 937, second compression spring; 10, filter screen; 11, water tank. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0031] The present invention provides Figure 1-4 A constant pressure furnace changing automatic control method for a blast furnace hot blast furnace is shown, comprising the following steps: S1: Establish communication between the blast furnace hot blast furnace and the blower 2 PLC system. Both the blast furnace hot blast furnace and the blower use Siemens PLC, but the two locations are far apart, and optical fiber communication is not achieved between the systems. Since the communication signal requirements are not high, hard wiring is used to exchange data. Cables are laid from the two intermediate relays of the hot blast furnace PLC cabinet for the furnace change signal output to the blower station and connected to the input end of the blower station PLC, and fuses are used to protect the circuit; S2: Compile the program in the hot blast furnace PLC, and when changing the furnace, a furnace change signal is given and output to the I / O module of the blower 2 system through the relay, and the hot blast furnace system is configured with a constant pressure automatic furnace change operation screen; S3: compile a program in the control system of the blower 2, and after receiving the furnace change signal of the hot air furnace system, automatically adjust the opening of the static blades of the blower 2 through the PID control program to stabilize the wind pressure, and keep the wind pressure and air volume during the furnace change consistent with those before the furnace change; S4: Constant pressure furnace change operation is realized through PID automatic adjustment. PID control is a common method of process control. By performing proportional, integral and differential operations on the difference between the feedback signal of the controlled quantity and the target signal, and adjusting the output frequency of the inverter, a closed-loop system is formed to stabilize the controlled quantity at the target value. It is suitable for process control occasions such as flow control, pressure control and temperature control.

[0032] like Figure 3 The control principle block diagram of the process PID is shown below, where Proportional gain Kp: determines the regulation strength of the entire PID regulator. The larger the Kp, the greater the regulation strength. This parameter 100.0 means that when the deviation between the PID feedback amount and the given amount is 100.0%, the regulation amplitude of the PID regulator on the output frequency command is the maximum frequency.

[0033] Integral time Ti: determines the strength of the integral regulation of the PID regulator. The shorter the integral time, the greater the regulation strength. The integral time refers to the time when the deviation between the PID feedback and the given amount is 100.0%, and the integral regulator continuously adjusts after this time, and the adjustment amount reaches the maximum frequency.

[0034] Differential time Td: determines the intensity of the PID regulator's regulation of the deviation change rate. The longer the differential time, the greater the regulation intensity. The differential time refers to the maximum frequency when the feedback amount changes by 100.0% within this time.

[0035] In step S3, the PID control procedure includes the following steps: S31: The hot air furnace starts to change and sends a signal to the blower 2 PLC system through hard-wire communication; S32: The blower 2 system receives the furnace change signal and assigns the pressure on the exhaust side of the blower 2 to the adjustment set value P1; S33: Obtain a furnace change start signal, assign the fan stator blade PID parameter to an initial fixed value, and set the exhaust side pressure to a measured input value P2; S34: 30 seconds after the furnace change starts, according to the exhaust side pressure P1 at the beginning of the furnace change and the exhaust side pressure P2 during the furnace change, the stator blade opening is automatically adjusted through the initial fixed PID parameters, and the upper and lower limits of the stator blade adjustment are limited to between 55° and 75°; S35: After 30 seconds, the proportional and integral effects of PID parameters are reduced, the adjustment oscillation is eased, the upper and lower limits of the adjustment parameters are cancelled, the stator blade adjustment enters the fully automatic PID continuous control, and the stator blade opening is automatically adjusted according to the difference in the exhaust side pressure change; S36: The hot air furnace gives a furnace change end signal, the above PID control stops, and the constant pressure automatic adjustment is exited.

[0036] Application of PID automatic control combined with program control Figure 4 As shown in the figure, compared with the traditional PID control, the proportional, integral and differential parameters remain unchanged during the adjustment process. The proportional and integral parameters are the strongest in the first 30s of the furnace change. Since the flow and pressure inside the blast furnace show a rapid step-like decrease, the pressure inside the furnace needs to be quickly supplemented within 30s. However, according to the principle of PID control, the larger the proportional action parameter and the smaller the integral time, the larger the adjustment amplitude will be. Therefore, it is necessary to limit the upper and lower limits of the adjustment opening to avoid excessive adjustment causing a large fluctuation in the blast furnace top pressure and causing production accidents. Therefore, the first 30s are high-proportional and low-integral, and the static blade opening output adjustment range is limited to between 55° and 75° according to the actual situation on site. After 30s, the pressure inside the furnace tends to be stable through the rapid adjustment of the static blade. At this time, according to the exhaust side pressure of the blower as the measured input value P2, the proportional action is reduced, the integral time is increased, and the adjustment range limit is cancelled. The wind pressure is automatically adjusted until the furnace change is completed.

[0037] The present invention also provides Figure 5-13 A constant pressure furnace changer for a hot blast furnace shown in the figure comprises a furnace body 1, a blower 2 is arranged on one side of the furnace body 1, and a smoke duct 3 is fixedly connected to the furnace body 1; Furthermore, one end of the smoke and dust duct 3 is fixedly connected to a filter box 4, a filter screen 10 is fixedly installed inside the filter box 4, and a cleaning device is arranged inside the filter box 4, the cleaning device includes: a cleaning mechanism 5, a driving mechanism 6, a knocking mechanism 7, a water spraying mechanism 8 and a swinging mechanism 9, the cleaning mechanism 5 is arranged on both sides of the filter screen 10; the driving mechanism 6 is arranged inside the filter box 4, for vertically displacing the cleaning mechanism 5; the knocking mechanism 7 is arranged on the cleaning mechanism 5, for intermittently knocking the filter screen 10; the water spraying mechanism 8 is arranged on the cleaning mechanism 5, for intermittently spraying water on the filter screen 10; the swinging mechanism 9 is arranged on one side of the filter box 4, for uniformly adjusting the wind direction.

[0038] Specifically, the cleaning mechanism 5 includes: a movable plate 51, a cleaning plate 52, a limit block 53 and a first compression spring 54, and the plurality of movable plates 51 are symmetrically arranged with the filter screen 10 as the center; a cleaning groove is provided on the side of the movable plate 51 close to the filter screen 10, and the cleaning plate 52 is slidably and interlacedly connected with the inner cavity of the cleaning groove; limit grooves are provided on both sides of the cleaning groove, and the limit block 53 is slidably and interlacedly connected with the inner cavity of the limit groove, and the limit block 53 is fixedly connected with the cleaning plate 52; a first compression spring 54 is arranged inside the cleaning groove, one end of the first compression spring 54 is fixedly connected with the cleaning plate 52, and the other end of the first compression spring 54 is fixedly connected with the inner wall of the cleaning groove, and the first compression spring 54 is always in a compressed state, thereby providing a stable elastic force to the cleaning plate 52, so that the cleaning plate 52 can be close to the outer wall of the filter screen 10, so that when the driving mechanism 6 drives the cleaning plate 52 to move in the vertical direction, the filter screen 10 can be cleaned.

[0039] Specifically, the driving mechanism 6 includes: a protective shell 61, a motor 62, a driving rod 63, a sliding rod 64, a rotating rod 65 and a transmission member 66. The protective shell 61 is fixedly connected to the top of the filter box 4; the motor 62 is fixedly installed at the top of the protective shell 61, and the motor 62 is electrically connected to the external power supply through an external switch. The motor 62 can simultaneously drive multiple driving rods 63 and the rotating rod 65 to rotate synchronously through the transmission member 66; the driving rod 63 is rotatably arranged inside the filter box 4, and the driving rod 63 and the cleaning plate 52 form a screw transmission. The motor The output end of 62 is transmission-connected with one end of the driving rod 63; both ends of the sliding rod 64 are fixedly connected with the inner wall of the filter box 4, and the sliding rod 64 plays a role in limiting the movable plate 63, so that the driving rod 63 can be displaced in the vertical direction along the sliding rod 64 when rotating; the rotating rod 65 is rotatably arranged between the protective shell 61 and the filter box 4; the transmission member 66 is arranged inside the protective shell 61, and is used to drive the driving rod 63 and the rotating rod 65 to rotate synchronously, and the transmission member 66 is a synchronous wheel and a synchronous belt, and the specific positions of the multiple synchronous wheels are as shown in FIG. Fig. 9 shown.

[0040] Furthermore, the driving mechanism 6 also includes: a first rack 67, a linkage rod 68 and a first gear 69. A groove is provided on the side of the sliding rod 64 close to the filter screen 10, and the first rack 67 is fixedly connected to the inside of the groove; the linkage rod 68 is rotatably arranged inside the movable plate 51; the first gear 69 is fixedly connected with the linkage rod 68, and the first gear 69 is meshingly connected with the first rack 67. When the movable plate 63 rotates along the sliding rod 64, the first gear 69 can roll on the first rack 67, thereby driving the linkage rod 68 to rotate.

[0041] Specifically, the knocking mechanism 7 includes: a rotating disk 71, an extrusion plate 72, an extrusion rod 73, a knocking ball 74 and a tension spring 75. A plurality of through slots are symmetrically provided on the movable plate 51. The linkage rod 68 is rotatably connected to the inner cavity of the through slot, and the rotating disk 71 is fixedly connected to the linkage rod 68. A plurality of extrusion plates 72 are equidistantly fixedly connected to the outer wall of the rotating disk 71; the extrusion rod 73 is rotatably arranged inside the through slot; the knocking ball 74 is fixedly connected to one end of the extrusion rod 73, and the other end of the extrusion plate 72 cooperates with the extrusion rod 73; one end of the tension spring 75 is fixedly connected to the movable plate 51, and the other end of the tension spring 75 The ends are fixedly connected to the squeezing rod 73. When the linkage rod 68 rotates, the turntables 71 on both sides can be driven to rotate, so that the multiple squeezing plates 72 can intermittently squeeze the squeezing rod 73, so that the squeezing rod 73 can rotate counterclockwise and the knocking ball 74 can be away from the filter 10. When the squeezing plate 72 is separated from the squeezing rod 73, it can be reset under the elastic force of the tension spring 75, so that the knocking ball 74 can knock on the outer frame of the filter 10, so that the dust caked on the filter 10 is loosened and broken, which is convenient for subsequent cleaning.

[0042] Specifically, the water spray mechanism 8 includes: an eccentric wheel 81, a C-shaped plate 82, an airbag 83, a mounting seat 84, a high-pressure nozzle 85, a bellows 86 and a water inlet pipe 87. A plurality of extrusion grooves are equidistantly provided on the movable plate 51. The linkage rod 68 is rotatably connected with the inner cavity of the extrusion groove. The eccentric wheel 81 is located inside the extrusion groove. The eccentric wheel 81 and the linkage rod 68 are fixedly connected. The C-shaped plate 82 is located inside the extrusion groove. The eccentric wheel 81 and the inner cavity of the C-shaped plate 82 cooperate with each other. The airbag 83 is fixedly connected to the C When the linkage rod 68 rotates, the eccentric wheel 81 can be driven to rotate, so that the C-shaped plate 82 can slide inside the extrusion groove and squeeze and stretch the airbag 83. The connecting pipes on the multiple airbags 83 are connected to the inner cavity of the mounting seat 84, so that negative pressure can be generated inside the mounting seat 84 to pump water from the inside of the water tank 11 through the bellows 86 and the water inlet pipe 87, and positive pressure can also be generated inside, so that the water inside the mounting seat 84 can be pumped out through the multiple airbags 83. The high-pressure nozzle 85 sprays out, so that the filter 10 can be intermittently sprayed with water, and the water can soak and soften stubborn impurities. The cleaning plate 52 can clean the stubborn impurities by sweeping, so that the cleaning effect of the filter 10 is better; the mounting seat 84 is fixedly connected to the top of the movable plate 51, and the air outlet end of the air bag 83 is fixedly connected with the mounting seat 84; the high-pressure nozzle 85 is fixedly installed on one side of the mounting seat 84 close to the filter 10; the bellows 86 is fixedly connected to the top of the mounting seat 84, and the other side of the bellows 86 is fixedly connected to the top of the mounting seat 84. The end is fixedly connected with the top of the filter box 4, and a one-way valve is provided on the high-pressure nozzle 85 and the bellows 86; a water tank 11 is provided on one side of the filter box 4, one end of the water inlet pipe 87 is fixedly connected with the bellows 86, and the other end of the water inlet pipe 87 is fixedly connected with the water tank 11. The bellows 86 has a telescopic characteristic, so as to ensure that the movable plate 51 will not affect the water delivery function when it is raised and lowered. At the same time, the water tank 11 can not only provide water source during cleaning, but also recover waste heat from the filtered gas.

[0043] Specifically, the swing mechanism 9 includes: an air inlet pipe 91, an air inlet plate 92 and a swing assembly 93. The air inlet pipe 91 is fixedly connected to one side of the inner wall of the filter box 4; multiple air inlet plates 92 are equidistantly rotated and arranged inside the air inlet pipe 91 through a rotating shaft; the swing assembly 93 is connected to the rotating rod 65, and is used to drive the air inlet plate 92 to swing back and forth. The swing assembly 93 can drive the air inlet plate 92 to swing back and forth, so that the wind entering the filter box 4 can be evenly distributed on the filter screen 10, so that the filter screen 10 can be fully utilized.

[0044] Furthermore, the swing assembly 93 includes: a second gear 931, a sleeve 932, a telescopic rod 933, a second rack 934, a rotating block 935, a ball 936 and a second compression spring 937. The second gear 931 is fixedly connected to the rotating shaft; the sleeve 932 is fixedly connected to the bottom end of the inner wall of the filter box 4; one end of the telescopic rod 933 is slidably connected to the inner cavity of the sleeve 932; the second rack 934 is fixedly connected to the telescopic rod 933, and the second gear 931 is meshed with the second rack 934; the rotating block 935 is fixedly connected to the rotating rod 65, and a lifting groove is provided at the bottom end of the rotating block 935. A ball 936 is provided inside the other end of the telescopic rod 933, and the ball 936 cooperates with the lifting groove; the second compression spring 937 is located inside the sleeve 932, and the second One end of the compression spring 937 is fixedly connected to the telescopic rod 933, and the other end of the second compression spring 937 is fixedly connected to the inner wall of the sleeve 932. The second compression spring 937 is always in a compressed state, thereby providing a stable elastic force to the telescopic rod 933, so that the ball 936 can be close to the top of the inner wall of the lifting groove, and when the rotating block 935 rotates, the lifting groove with different inner wall depths but smooth surface can be used to make the telescopic rod 933 move back and forth in the vertical direction, and the second rack 934 can drive multiple second gears 931 to rotate back and forth, so that the air inlet plate 92 can swing back and forth, so that the wind entering the filter box 4 can be evenly distributed on the filter screen 10, so that the filter screen 10 can be fully utilized.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for automatically controlling a constant pressure furnace changeover of a hot blast furnace of a blast furnace, characterized in that: The following steps are involved: S1: Establish communication between the blast furnace hot blast stove and the blower (2) PLC system; S2: Compile the program in the hot blast furnace PLC, and when changing the furnace, a furnace change signal is given and outputted to the blower (2) system I / O module through the relay, and the hot blast furnace system is configured with a constant pressure automatic furnace change operation screen; S3: compiling a program in the control system of the blower (2), and upon receiving a furnace change signal from the hot air furnace system, automatically adjusting the opening of the static blades of the blower (2) through a PID control program, stabilizing the wind pressure, and keeping the wind pressure and air volume during the furnace change consistent with those before the furnace change; S4: Realize constant pressure furnace changing operation through PID automatic adjustment.

2. A blast furnace hot blast stove constant pressure automatic control method according to claim 1, characterized in that: In step S3, the PID control procedure includes the following steps: S31: The hot air furnace starts changing and sends a signal to the blower (2) PLC system via hard-wire communication; S32: the blower (2) system receives the furnace change signal and assigns the pressure on the exhaust side of the blower (2) to the adjustment set value P1; S33: Obtain a furnace change start signal, assign the fan stator blade PID parameter to an initial fixed value, and set the exhaust side pressure to a measured input value P2; S34: 30 seconds after the furnace change starts, according to the exhaust side pressure P1 at the beginning of the furnace change and the exhaust side pressure P2 during the furnace change, the stator blade opening is automatically adjusted through the initial fixed PID parameters, and the upper and lower limits of the stator blade adjustment are limited to between 55° and 75°; S35: After 30 seconds, the proportional and integral effects of PID parameters are reduced, the adjustment oscillation is eased, the upper and lower limits of the adjustment parameters are cancelled, the stator blade adjustment enters the fully automatic PID continuous control, and the stator blade opening is automatically adjusted according to the difference in the exhaust side pressure change; S36: The hot air furnace gives a furnace change end signal, the above PID control stops, and the constant pressure automatic adjustment is exited.

3. A constant pressure furnace changer for a blast furnace hot blast furnace, comprising a furnace body (1), a blower (2) being arranged on one side of the furnace body (1), and a smoke duct (3) being fixedly connected to the furnace body (1); Features: One end of the smoke and dust duct (3) is fixedly connected to a filter box (4), a filter screen (10) is fixedly installed inside the filter box (4), and a cleaning device is arranged inside the filter box (4), the cleaning device comprising: A cleaning mechanism (5), wherein the cleaning mechanism (5) is arranged on both sides of the filter screen (10); A driving mechanism (6), the driving mechanism (6) being arranged inside the filter box (4) and used for displacing the cleaning mechanism (5) in a vertical direction; A knocking mechanism (7), the knocking mechanism (7) being arranged on the cleaning mechanism (5) and being used for intermittently knocking the filter screen (10); a water spraying mechanism (8), the water spraying mechanism (8) being arranged on the cleaning mechanism (5) and being used for intermittently spraying water on the filter screen (10); A swing mechanism (9), wherein the swing mechanism (9) is arranged on one side of the filter box (4) and is used to evenly adjust the wind direction.

4. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 3, characterized in that: The cleaning mechanism (5) comprises: A movable plate (51), wherein the movable plate (51) is symmetrically arranged with the filter screen (10) as the center; A cleaning plate (52), wherein a cleaning groove is provided on a side of the movable plate (51) close to the filter screen (10), and the cleaning plate (52) is slidably interlaced with the inner cavity of the cleaning groove; A limit block (53), wherein limit grooves are provided on both sides of the cleaning groove, the limit block (53) is slidably connected with the inner cavity of the limit groove, and the limit block (53) is fixedly connected with the cleaning plate (52); A first compression spring (54), wherein the first compression spring (54) is arranged inside the cleaning groove, one end of the first compression spring (54) is fixedly connected to the cleaning plate (52), and the other end of the first compression spring (54) is fixedly connected to the inner wall of the cleaning groove.

5. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 4, characterized in that: The driving mechanism (6) comprises: A protective shell (61), wherein the protective shell (61) is fixedly connected to the top of the filter box (4); A motor (62), wherein the motor (62) is fixedly mounted on a top end of the protective shell (61); a driving rod (63), the driving rod (63) being rotatably disposed inside the filter box (4), the driving rod (63) and the cleaning plate (52) forming a screw drive, the output end of the motor (62) being drivingly connected to one end of the driving rod (63); A sliding rod (64), wherein the sliding rod (64) is fixedly connected to the inner wall of the filter box (4); A rotating rod (65), the rotating rod (65) being rotatably disposed between the protective shell (61) and the filter box (4); A transmission member (66), wherein the transmission member (66) is arranged inside the protective shell (61) and is used to drive the driving rod (63) and the rotating rod (65) to rotate synchronously.

6. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 5, characterized in that: The driving mechanism (6) further comprises: a first rack (67), wherein a groove is provided on a side of the slide bar (64) close to the filter screen (10), and the first rack (67) is fixedly connected to the inside of the groove; A linkage rod (68), wherein the linkage rod (68) is rotatably disposed inside the movable plate (51); A first gear (69), the first gear (69) is fixedly connected to the linkage rod (68) by insertion, and the first gear (69) is meshingly connected to the first rack (67).

7. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 6, characterized in that: The knocking mechanism (7) comprises: A rotating disk (71), wherein a plurality of through slots are symmetrically formed on the movable plate (51), the linkage rod (68) is rotatably interlaced with the inner cavity of the through slots, and the rotating disk (71) is fixedly interlaced with the linkage rod (68); Extrusion plates (72), a plurality of the extrusion plates (72) being fixedly connected to the outer wall of the rotating disk (71) at equal intervals; An extrusion rod (73), the extrusion rod (73) being rotatably disposed inside the through slot; A knocking ball (74), wherein the knocking ball (74) is fixedly connected to one end of the extrusion rod (73), and the extrusion plate (72) cooperates with the other end of the extrusion rod (73); A tension spring (75), one end of the tension spring (75) is fixedly connected to the movable plate (51), and the other end of the tension spring (75) is fixedly connected to the extrusion rod (73).

8. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 6, characterized in that: The water spraying mechanism (8) comprises: An eccentric wheel (81), wherein a plurality of extrusion grooves are equidistantly formed on the movable plate (51), the linkage rod (68) is rotatably interlaced with the inner cavity of the extrusion groove, the eccentric wheel (81) is located inside the extrusion groove, and the eccentric wheel (81) is fixedly interlaced with the linkage rod (68); A C-shaped plate (82), the C-shaped plate (82) being located inside the extrusion groove, the eccentric wheel (81) and the inner cavity of the C-shaped plate (82) being matched with each other; An airbag (83), wherein the airbag (83) is fixedly connected between the C-shaped plate (82) and the inner wall of the extrusion groove; A mounting seat (84), the mounting seat (84) being fixedly connected to the top end of the movable plate (51), and the air outlet end of the air bag (83) being fixedly interlaced and connected to the mounting seat (84); A high-pressure nozzle (85), the high-pressure nozzle (85) being fixedly mounted on a side of the mounting seat (84) close to the filter screen (10); a bellows (86), the bellows (86) being fixedly connected to the top end of the mounting seat (84), the other end of the bellows (86) being fixedly connected through the top end of the filter box (4), and the high-pressure nozzle (85) and the bellows (86) being both provided with a one-way valve; A water inlet pipe (87), a water tank (11) is provided on one side of the filter box (4), one end of the water inlet pipe (87) is fixedly connected to the corrugated pipe (86), and the other end of the water inlet pipe (87) is fixedly connected to the water tank (11) in an interlaced manner.

9. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 5, characterized in that: The swing mechanism (9) comprises: An air inlet pipe (91), the air inlet pipe (91) being fixedly connected to one side of the inner wall of the filter box (4); Air inlet plates (92), wherein a plurality of the air inlet plates (92) are rotatably arranged at equal intervals inside the air inlet pipe (91) via a rotating shaft; A swing assembly (93), wherein the swing assembly (93) is connected to the rotating rod (65) and is used to drive the air inlet plate (92) to swing back and forth.

10. A constant pressure furnace replacement for hot blast stoves in a blast furnace according to claim 9, characterized in that: The swing assembly (93) comprises: A second gear (931), the second gear (931) being fixedly interlaced with the rotating shaft; A sleeve (932), wherein the sleeve (932) is fixedly connected to the bottom end of the inner wall of the filter box (4); A telescopic rod (933), one end of which is slidably connected to the inner cavity of the sleeve (932); a second rack (934), the second rack (934) being fixedly connected to the telescopic rod (933), the second gear (931) being meshingly connected to the second rack (934); A rotating block (935), the rotating block (935) is fixedly connected to the rotating rod (65), a lifting groove is provided at the bottom end of the rotating block (935), a ball (936) is provided inside the other end of the telescopic rod (933), and the ball (936) cooperates with the lifting groove; A second compression spring (937), the second compression spring (937) is located inside the sleeve (932), one end of the second compression spring (937) is fixedly connected to the telescopic rod (933), and the other end of the second compression spring (937) is fixedly connected to the inner wall of the sleeve (932).

Images