CN114410868A - Blast furnace top material flow adjusting control system and method - Google Patents
Blast furnace top material flow adjusting control system and method Download PDFInfo
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- CN114410868A CN114410868A CN202210075926.1A CN202210075926A CN114410868A CN 114410868 A CN114410868 A CN 114410868A CN 202210075926 A CN202210075926 A CN 202210075926A CN 114410868 A CN114410868 A CN 114410868A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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Abstract
The invention discloses a blast furnace top material flow regulation control system and a method, which comprises a detection encoder, a PLC (programmable logic controller) and a hydraulic control loop, wherein the PLC is respectively connected with the detection encoder and the hydraulic control loop, the PLC sends out a control signal to the hydraulic control loop after calculation to control the speed and the position of an oil cylinder, the detection encoder detects and calibrates the position of the oil cylinder and inputs the position into the PLC, and the PLC calculates the detection data of the detection encoder and then corrects and controls the hydraulic control loop, so that closed-loop control is formed, the precision of material flow regulation control is smaller than 0.2 degrees, wherein the hydraulic control loop comprises a main loop and a standby loop and can be switched through the PLC. The invention has the advantages of high control precision, good safety, automatic adjustment, energy saving and the like, can reduce the failure rate in the blast furnace material distribution smelting process, and improves the working efficiency of furnace top material distribution operation and the service life of equipment.
Description
Technical Field
The invention belongs to the technical field of blast furnace smelting, and particularly relates to a blast furnace top material flow adjusting and controlling system and method.
Background
As is known, in the production process of a blast furnace, the opening control of a material flow regulating valve is crucial, and the material distribution flow of a blanking gate can be effectively controlled only if the actual opening control is accurate enough, so that furnace burden is accurately distributed to the material level in the furnace according to the angular position, the number of parts and the material distribution time set by a material distribution matrix, the material distribution at the top of the furnace and the upper regulation can be accurately and efficiently realized, and the stable operation of the blast furnace production is ensured.
The material distribution of blast furnace passes through the material flow governing valve with the size of control material flow, and the hydro-cylinder through hydraulic control governing valve is adopted to more control mode at present to the size of control material flow, conventional material flow governing valve control system adopts solenoid valve or proportional valve to control, and its control circuit structure is shown as figure 1, mainly comprises check valve, magenetic exchange valve, hydraulic lock, choke valve, ball valve, integrated valve piece and ball valve etc. has following shortcoming: the precision is poor, and the control precision is low by adopting an electromagnetic valve; secondly, the speed cannot be continuously adjusted, the speed of the oil cylinder can be manually adjusted, and the continuous control cannot be realized; the material distribution is not uniform, the material distribution is not uniform due to poor material flow adjustment precision, and the phenomenon of no material distribution or multiple material distributions exists; the safety is poor, and the hydraulic circuit cannot be automatically switched when in fault; large impact, which is caused by constant speed control when the equipment is started and stopped; energy waste and raw material waste caused by low material distribution control precision; emission amount is large, and the condition that the material surface does not reach the material exists, so that the material surface is burnt by open fire to cause emission of a large amount of combustion gas; the maintenance is difficult and the online maintenance cannot be realized; and ninthly, the fault rate is high, the impact and the vibration are large, and the equipment fault is increased due to high temperature.
In view of the above, the present invention provides a system and a method for regulating and controlling the flow of a blast furnace top material, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a blast furnace top material flow adjusting control system and a blast furnace top material flow adjusting control method, the control system has the advantages of high control precision, good safety, automatic adjustment, energy saving and the like, the fault rate in the blast furnace material distribution smelting process can be reduced, the work efficiency of furnace top material distribution operation is improved, and the service life of equipment is prolonged.
The purpose of the invention is solved by the following technical scheme:
the utility model provides a blast furnace roof material flow regulation control system, is including detecting encoder, PLC controller and hydraulic control circuit, the PLC controller is connected with detecting encoder and hydraulic control circuit respectively, the PLC controller sends control signal to hydraulic control circuit after according to cloth technology and measured data automatic calculation, hydraulic control circuit obtains control signal back, controls the speed and the position of hydro-cylinder, detect the encoder and detect the hydro-cylinder position and input to the PLC controller in, the PLC controller is again according to detecting the detection data calculation back of encoder and correcting control hydraulic control circuit to form closed-loop control.
Furthermore, the hydraulic control circuit comprises a main circuit and a standby circuit which are mutually independent, the main circuit and the standby circuit are respectively connected with the PLC, and the main circuit and the standby circuit can be switched through the PLC.
Furthermore, the main loop comprises a first ball valve, a proportional reversing valve, a first hydraulic control one-way valve, a second ball valve, a third ball valve, a fourth ball valve, a fifth ball valve, a second hydraulic control one-way valve, a first electromagnetic reversing valve, a first one-way valve and an oil cylinder;
the oil inlet P1 of the proportional reversing valve is communicated with a high-pressure oil supply pipeline P through an oil duct, the oil return port T1 of the proportional reversing valve is communicated with an oil return pipeline T through the oil duct, and the electromagnet Y1a of the proportional reversing valve is connected with a PLC (programmable logic controller);
the first output oil port A1 of the proportional reversing valve is communicated with the first working port of the oil cylinder through a first hydraulic control one-way valve, a second ball valve and a third ball valve in sequence, and the second output oil port B1 of the proportional reversing valve is communicated with the second working port of the oil cylinder through a second hydraulic control one-way valve, a fifth ball valve and a fourth ball valve in sequence;
an oil inlet P2 of the first electromagnetic directional valve is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T2 of the first electromagnetic directional valve is communicated with an oil return pipeline T through the oil duct, a first one-way valve is arranged on the oil duct between the oil inlet and the oil return pipeline T, and an electromagnet Y1c of the first electromagnetic directional valve is connected with a PLC (programmable logic controller);
a second oil outlet B2 of the first electromagnetic directional valve is respectively connected with the first hydraulic control one-way valve and the second hydraulic control one-way valve;
and oil passages of an oil inlet P1 of the proportional reversing valve, an oil inlet P2 of the first electromagnetic reversing valve and a high-pressure oil supply pipeline P are provided with first ball valves.
Furthermore, the main circuit also comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are both connected with the PLC;
the first pressure sensor is arranged on an oil passage between the first hydraulic control one-way valve and the second ball valve, and the second pressure sensor is arranged on an oil passage between the fifth ball valve and the second hydraulic control one-way valve.
Further, the standby loop comprises a sixth ball valve, a second electromagnetic directional valve, a first hydraulic lock, a first throttle valve, a seventh ball valve, an eighth ball valve, a second throttle valve, a second hydraulic lock and a second one-way valve;
the oil inlet P3 of the second electromagnetic directional valve is communicated with the high-pressure oil supply pipeline P through an oil duct, the oil return port T3 of the second electromagnetic directional valve is communicated with the oil return pipeline T through the oil duct, a second one-way valve is arranged on the oil duct between the oil return port T3 and the oil return pipeline T, and the electromagnet Y2a of the second electromagnetic directional valve is connected with the PLC;
the first output oil port A3 of the second electromagnetic directional valve is communicated with an oil passage between the second ball valve and the third ball valve through the first hydraulic lock, the first throttle valve and the seventh ball valve in sequence, and the second output oil port B3 of the second electromagnetic directional valve is communicated with an oil passage between the fourth ball valve and the fifth ball valve through the second hydraulic lock, the second throttle valve and the eighth ball valve in sequence.
Further, the first electromagnetic directional valve and the second electromagnetic directional valve both adopt an external leakage valve.
Further, the proportional reversing valve is an electromagnetic proportional reversing valve or an electro-hydraulic proportional reversing valve.
Furthermore, the first hydraulic control one-way valve and the second hydraulic control one-way valve are both external control leakage hydraulic control one-way valves.
A blast furnace top material flow adjusting control method is based on any one of the blast furnace top material flow adjusting control systems, and specifically comprises the following steps:
step one, when the material is normally distributed, a PLC controller automatically calculates according to the material distribution process and the measured data and then sends a control signal to a hydraulic control loop;
step two, after the hydraulic control circuit obtains a control signal, the speed and the position of the oil cylinder are controlled by selecting a main circuit or a standby circuit according to the fault condition;
when the main loop works, an electromagnet Y1c of a first electromagnetic directional valve is electrified firstly, a P2 and a B2 in the first electromagnetic directional valve are communicated, hydraulic oil reaches control ports x of a first hydraulic control one-way valve and a second hydraulic control one-way valve through a first ball valve and the first electromagnetic directional valve, the first hydraulic control one-way valve and the second hydraulic control one-way valve are opened, an oil cylinder can act, at the moment, Y1a in the proportional directional valve is electrified, P1 and B1 are communicated, A1 and T1 are communicated, the hydraulic oil enters a rod cavity of the oil cylinder through the first ball valve, the proportional directional valve, the second hydraulic control one-way valve, a fifth ball valve and a fourth ball valve, return oil flows back through a rodless cavity through a third ball valve, the second ball valve, the first hydraulic control one-way valve and the first one-way valve, a backward oil cylinder is controlled, when Y1B in the proportional directional valve is electrified, P1 and A1 are communicated, T1 and B1 are communicated, an oil circuit is communicated, and an oil circuit is controlled to control the backward oil cylinder;
when the standby loop works, Y2a of the second electromagnetic directional valve is electrified, P3 and B3 in the second electromagnetic directional valve are communicated, T3 and A3 are communicated, hydraulic oil enters a rod cavity of the control oil cylinder through a sixth ball valve, a second electromagnetic directional valve, a second hydraulic lock, a second throttle valve and an eighth ball valve, return oil flows back through a seventh ball valve, a first throttle valve, a first hydraulic lock, a second electromagnetic directional valve and a second one-way valve, the control oil cylinder retreats, when Y2B of the second electromagnetic directional valve is electrified, P3 and A3 are communicated, T3 and B3 are communicated, an oil way is reversed, and the control oil cylinder advances;
and step three, the detection encoder detects and calibrates the position of the oil cylinder and inputs the position into the PLC, and the PLC performs correction control on the hydraulic control loop after calculating according to the detection data of the detection encoder, so that closed-loop control is formed.
Further, the control method has a function of automatically detecting faults, if the pressure signal detected by the first pressure sensor or the second pressure sensor on the corresponding oil way is abnormal when the proportional directional valve or the first electromagnetic directional valve is in fault, the PLC carries out fault judgment according to the detected pressure signal data, and automatically switches to the second electromagnetic directional valve for control, starts a standby loop, and simultaneously alarms.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a blast furnace top material flow regulation control system and a method, which comprises a detection encoder, a PLC (programmable logic controller) and a hydraulic control loop, wherein the PLC is respectively connected with the detection encoder and the hydraulic control loop, the PLC sends a control signal to the hydraulic control loop after automatically calculating according to a material distribution process and measurement data, the hydraulic control loop controls the speed and the position of an oil cylinder after obtaining the control signal, the detection encoder detects and calibrates the position of the oil cylinder and inputs the position into the PLC, and the PLC corrects and controls the hydraulic control loop after calculating according to the detection data of the detection encoder, so that closed-loop control is formed, and the precision of material flow regulation and control is smaller than 0.2 degrees; the hydraulic control circuit comprises a main circuit and a standby circuit which are independent from each other. Compared with the prior art, the method has the following advantages:
the precision is high, and the precision is high by adopting a proportional valve and an encoder to carry out closed-loop control;
the speed is automatically controlled, and the continuous speed control of the oil cylinder is realized through a control system;
thirdly, distributing materials evenly, detecting the position by adopting an encoder, and automatically controlling by a control system to realize the even distribution of the blast furnace;
the safety is high, and the safety is improved by adopting the control of an external control hydraulic control one-way valve and the automatic switching of a standby loop;
the impact is small, and low-speed starting and stopping control is adopted, so that the vibration and impact of equipment are reduced;
sixthly, energy is saved, the distribution precision is high, and the waste of raw materials and combustion heat energy is reduced;
emission is small, the condition that materials are not distributed on the material surface is reduced, and the increase of the emission of blast furnace gas caused by open flame combustion is reduced;
the overhaul is convenient, a standby control loop can be automatically switched, and online overhaul is realized;
and ninthly, the fault rate is low, the equipment stable fault rate is reduced, and the top temperature of the furnace top is reduced to reduce the high-temperature fault of the equipment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a block diagram of a prior art blast furnace top stream regulating valve control loop;
fig. 2 is a block diagram of a blast furnace top stream regulating control system for valve control according to the present invention.
In the figure: 1 is a detection encoder; 2 is a PLC controller; 3 is a hydraulic control loop; 31 is a main loop; 32 is a standby loop; 321 is a sixth ball valve; 322 is a second electromagnetic directional valve; 323 is a first hydraulic lock; 324 is a first throttle valve; 325 is a seventh ball valve; an eighth ball valve 326; 327 is a second throttle valve; 328 is a second hydraulic lock; 329 is a second one-way valve; 3101 it is a first ball valve; 3102 a proportional reversing valve; 3103 a first pilot operated check valve; 3104 a second ball valve; 3105 a first pressure sensor; 3106 an eighth ball valve; 3107 a fourth ball valve; 3108 a fifth ball valve; 3109 for a second pressure sensor; 3110 is a second hydraulic control check valve; 3111 is a first electromagnetic directional valve; 3112 is a first check valve.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
Referring to fig. 2, the blast furnace top material flow regulation control system of the present invention includes a detection encoder 1, a PLC controller 2 and a hydraulic control loop 3, wherein the PLC controller 2 is respectively connected to the detection encoder 1 and the hydraulic control loop 3, the PLC controller 2 of 1 automatically calculates according to the material distribution process and the measurement data and then sends a control signal to the hydraulic control loop 3, the hydraulic control loop 3 controls the speed and the position of the oil cylinder after obtaining the control signal, the detection encoder 1 detects and calibrates the position of the oil cylinder and inputs the oil cylinder into the PLC controller 2, the PLC controller 2 calculates according to the detection data of the detection encoder 1 and then corrects and controls the hydraulic control loop 3, thereby integrally forming a closed-loop control, and the precision of the material flow regulation control can be less than 0.2 degree through actual verification.
In the embodiment of the present invention, the hydraulic control circuit 3 includes a main circuit 31 and a backup circuit 32 that are independent of each other, the main circuit 31 and the backup circuit 32 are respectively connected to the PLC controller 2, and the main circuit 31 and the backup circuit 32 can be freely switched by the PLC controller 2.
Specifically, the main circuit 31 of the embodiment of the present invention includes a first ball valve 3101, a proportional directional valve 3102, a first pilot-controlled check valve 3103, a second ball valve 3104, a third ball valve 3106, a fourth ball valve 3107, a fifth ball valve 3108, a second pilot-controlled check valve 3110, a first electromagnetic directional valve 3111, a first check valve 3112 and an oil cylinder; wherein, the oil inlet P1 of the proportional reversing valve 3102 is communicated with a high-pressure oil supply pipeline P through an oil duct, the oil return port T1 of the proportional reversing valve 3102 is communicated with an oil return pipeline T through an oil duct, and the electromagnet Y1a of the proportional reversing valve 3102 is connected with the PLC controller 2; the first output oil port A1 of the proportional reversing valve 3102 is communicated with the first working port of the oil cylinder through a first hydraulic control one-way valve 3103, a second ball valve 3104 and a third ball valve 3106 in sequence, and the second output oil port B1 of the proportional reversing valve 3102 is communicated with the second working port of the oil cylinder through a second hydraulic control one-way valve 3110, a fifth ball valve 3108 and a fourth ball valve 3107 in sequence.
In the embodiment of the invention, an oil inlet P2 of a first electromagnetic directional valve 3111 is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T2 of the first electromagnetic directional valve 3111 is communicated with an oil return pipeline T through the oil duct, a first one-way valve 3112 is arranged on the oil duct between the oil return port T2 and the oil return pipeline T, and an electromagnet Y1c of the first electromagnetic directional valve 3111 is connected with a PLC (programmable logic controller) 2; a second output oil port B2 of the first electromagnetic directional valve 3111 is connected to the first pilot operated check valve 3103 and the second pilot operated check valve 3110, respectively; the oil passages of the oil inlet P1 of the proportional directional valve 3102, the oil inlet P2 of the first electromagnetic directional valve 3111 and the high-pressure oil supply pipeline P are provided with a first ball valve 3101.
Preferably, the main circuit 31 of the embodiment of the present invention further includes a first pressure sensor 3105 and a second pressure sensor 3109, and both the first pressure sensor 3105 and the second pressure sensor 3109 are connected to the PLC controller 2; among them, the first pressure sensor 3105 is installed on the oil passage between the first pilot check valve 3103 and the second ball valve 3104, and the second pressure sensor 3109 is installed on the oil passage between the fifth ball valve 3108 and the second pilot check valve 3110. That is, whether the main circuit 31 is operating normally can be detected by the first pressure sensor 3105 and the second pressure sensor 3109.
The standby circuit 32 of the embodiment of the present invention includes a sixth ball valve 321, a second electromagnetic directional valve 322, a first hydraulic lock 323, a first throttle valve 324, a seventh ball valve 325, an eighth ball valve 326, a second throttle valve 327, a second hydraulic lock 328, and a second check valve 329; an oil inlet P3 of the second electromagnetic directional valve 322 is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T3 of the second electromagnetic directional valve 322 is communicated with an oil return pipeline T through the oil duct, a second one-way valve 329 is installed on the oil duct between the oil inlet and the oil return pipeline T, and an electromagnet Y2a of the second electromagnetic directional valve 322 is connected with the PLC 2; the first output oil port a3 of the second electromagnetic directional valve 322 is sequentially communicated with oil passages between the second ball valve 3104 and the third ball valve 3106 through the first hydraulic lock 323, the first throttle valve 324 and the seventh ball valve 325, and the second output oil port B3 of the second electromagnetic directional valve 322 is sequentially communicated with oil passages between the fourth ball valve 3107 and the fifth ball valve 3108 through the second hydraulic lock 328, the second throttle valve 327 and the eighth ball valve 326.
Preferably, in the embodiment of the present invention, both the first electromagnetic directional valve 3111 and the second electromagnetic directional valve 322 employ an external leakage valve, and the leaked oil may respectively return to the oil tank through an oil drainage pipeline (not shown in the figure), so as to reduce oil drainage back pressure and improve operation sensitivity and reliability.
Preferably, the proportional reversing valve 3102 of the present invention includes, but is not limited to, the form shown in the figures, and may be implemented as a single electromagnet or other functioning proportional reversing valve, such as an electromagnetic proportional reversing valve or an electro-hydraulic proportional reversing valve.
Preferably, in the embodiment of the present invention, the first hydraulic control check valve 3103 and the second hydraulic control check valve 3110 are both externally controlled leakage hydraulic control check valves, which reduces the failures such as reduction of valve action speed caused by oil leakage back pressure, and further improves the accuracy of the device control.
In addition, the invention also provides a blast furnace top material flow adjusting and controlling method, which is based on the control system and specifically comprises the following steps:
step one, when the material is normally distributed, the PLC controller 2 automatically calculates according to the material distribution process and the measured data and then sends a control signal to the hydraulic control loop 3;
step two, after the hydraulic control circuit 3 obtains a control signal, the speed and the position of the oil cylinder are controlled by the main circuit 31 or the standby circuit 31 according to the fault condition (the main circuit 31 controls the hydraulic control circuit in a conventional state, and the hydraulic control circuit is switched to the standby circuit 32 only when the main circuit 31 has a fault or needs to be overhauled);
specifically, when the main circuit 31 operates, the electromagnet Y1c of the first electromagnetic directional valve 3111 is firstly powered on, the P2 and the B2 in the first electromagnetic directional valve 3111 are communicated, the hydraulic oil reaches the control port x of the first hydraulic control one-way valve 3103 and the second hydraulic control one-way valve 3110 through the first ball valve 3101 and the first electromagnetic directional valve 3111, the first hydraulic control one-way valve 3103 and the second hydraulic control one-way valve 3110 are opened, the oil cylinder can act, at this time, the Y a in the proportional directional valve 3102 is powered on, the P1 and the B1 are communicated, the a1 and the T1 are communicated, the hydraulic oil enters the rod cavity of the oil cylinder through the first ball valve 3101, the proportional directional valve 3102, the second hydraulic control one-way valve 3110, the fifth ball valve 3108 and the fourth ball valve 3107, the return oil passes through the rodless cavity, passes through the third ball valve 3106, the second ball valve 3104, the first hydraulic control one-way valve 3103, the proportional directional valve 3112, the first hydraulic control one-way valve 3102, the proportional directional valve 3102 and the second ball valve 31023 and the proportional valve 1, t1 is communicated with B1, an oil way is reversed, and an oil cylinder is controlled to advance;
when the main loop 31 works, Y2a of the second electromagnetic directional valve 322 is electrified, P3 and B3 in the second electromagnetic directional valve 322 are communicated, T3 and A3 are communicated, hydraulic oil flows back through a sixth ball valve 321, the second electromagnetic directional valve 322, a second hydraulic lock 328, a second throttle valve 327 and an eighth ball valve 326 and enters a rod cavity of the control oil cylinder, return oil flows through a seventh ball valve 325, a first throttle valve 324, a first hydraulic lock 323, the second electromagnetic directional valve 322 and a second one-way valve 329, the control oil cylinder retreats, when Y2B of the second electromagnetic directional valve 322 is electrified, P3 and A3 are communicated, T3 and B3 are communicated, an oil path is reversed, and the control oil cylinder advances;
and step three, the detection encoder 1 detects and calibrates the position of the oil cylinder and inputs the position into the PLC 2, and the PLC 2 calculates the detection data of the detection encoder 1 and then carries out correction control on the hydraulic control loop 3, so that closed-loop control is formed.
The control method of the present invention has a function of automatically detecting a fault, for example, when the proportional directional valve 3102 or the first electromagnetic directional valve 3111 has a fault, the pressure signal detected by the first pressure sensor 3105 or the second pressure sensor 3109 on the corresponding oil path is abnormal, the PLC controller 2 performs fault judgment according to the detected pressure signal data, and automatically switches to the second electromagnetic directional valve 322 to control, and the standby loop 32 is started, and the PLC controller 2 alarms at the same time, without affecting the production operation of the blast furnace.
In addition, the control method has multilayer safety protection control, the main loop 31 adopts a first pilot-controlled check valve 3103 and a second pilot-controlled check valve 3110 which are externally controlled to leak, only when the first electromagnetic directional valve 3111 is powered, the first pilot-controlled check valve 3103 and the second pilot-controlled check valve 3110 are opened after hydraulic oil passes x, and at the moment, the proportional directional valve 3102 is operated to be useful, so that the operation safety is improved, the occurrence of misoperation is reduced, and meanwhile, the independent main loop 31 and the independent standby loop 32 are adopted for control, so that the safety level of blast furnace burden distribution is improved.
The invention can realize online replacement and maintenance, for example, when the elements in the main loop 31 are damaged, the first ball valve 3101, the second ball valve 3104 and the fifth ball valve 3108 are closed, the main loop 31 and the system are cut off, the standby loop 32 can be started at the moment, the elements in the main loop 31 are replaced and maintained online, the system can still work normally, when the elements in the standby loop 32 are damaged, the sixth ball valve 321, the seventh ball valve 325 and the eighth ball valve 326 are closed, the standby loop 32 and the system are cut off, the main loop 31 can be started to work at the moment, the elements in the standby loop 32 are replaced and maintained online, the system can still work uninterruptedly, and the production efficiency is improved.
According to the invention, different speed control of the oil cylinder is realized through the proportional reversing valve, the control precision is improved through closed-loop control, the problem of uneven distribution of the blast furnace caused by poor control precision of the opening degree due to low position precision of the oil cylinder is reduced, the excessive combustion phenomenon caused by incapability of distributing the material is reduced, the combustion collapse phenomenon caused by material accumulation is reduced, the combustion state of the blast furnace is improved, the emission is reduced, the smelting efficiency is improved, and the energy is saved.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides a blast furnace top material flow regulation control system, its characterized in that, is including detecting encoder (1), PLC controller (2) and hydraulic control return circuit (3), PLC controller (2) are connected with detecting encoder (1) and hydraulic control return circuit (3) respectively, PLC controller (2) send control signal to hydraulic control return circuit (3) after according to cloth technology and measured data automatic calculation, hydraulic control return circuit (3) obtain behind the control signal, control the speed and the position of hydro-cylinder, detect during encoder (1) detects the calibration and inputs PLC controller (2) to the hydro-cylinder position, PLC controller (2) again according to detecting after the data calculation of detecting encoder (1) carry out correction control to hydraulic control return circuit (3) to form closed-loop control.
2. The blast furnace top flow regulating control system according to claim 1, wherein the hydraulic control circuit (3) comprises a main circuit (31) and a backup circuit (32) which are independent of each other, the main circuit (31) and the backup circuit (32) are respectively connected with the PLC controller (2), and the main circuit (31) and the backup circuit (32) can be switched by the PLC controller (2).
3. The blast furnace top flow regulating control system according to claim 2, wherein the main circuit (31) comprises a first ball valve (3101), a proportional reversing valve (3102), a first hydraulically-controlled check valve (3103), a second ball valve (3104), a third ball valve (3106), a fourth ball valve (3107), a fifth ball valve (3108), a second hydraulically-controlled check valve (3110), a first electromagnetically-controlled reversing valve (3111), a first check valve (3112) and a cylinder;
an oil inlet P1 of the proportional reversing valve (3102) is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T1 of the proportional reversing valve (3102) is communicated with an oil return pipeline T through an oil duct, and an electromagnet Y1a of the proportional reversing valve (3102) is connected with a PLC (programmable logic controller) (2);
a first output oil port A1 of the proportional reversing valve (3102) is communicated with a first working port of the oil cylinder through a first hydraulic control one-way valve (3103), a second ball valve (3104) and a third ball valve (3106) in sequence, and a second output oil port B1 of the proportional reversing valve (3102) is communicated with a second working port of the oil cylinder through a second hydraulic control one-way valve (3110), a fifth ball valve (3108) and a fourth ball valve (3107) in sequence;
an oil inlet P2 of the first electromagnetic directional valve (3111) is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T2 of the first electromagnetic directional valve (3111) is communicated with the oil return pipeline T through the oil duct, a first one-way valve (3112) is installed on the oil duct between the oil return port T2 of the first electromagnetic directional valve and the oil return pipeline T, and an electromagnet Y1c of the first electromagnetic directional valve (3111) is connected with a PLC (PLC) controller (2);
a second output oil port B2 of the first electromagnetic directional valve (3111) is respectively connected with a first hydraulic control one-way valve (3103) and a second hydraulic control one-way valve (3110);
and a first ball valve (3101) is arranged on oil passages of an oil inlet P1 of the proportional reversing valve (3102), an oil inlet P2 of the first electromagnetic reversing valve (3111) and the high-pressure oil supply pipeline P.
4. The blast furnace top flow regulating control system according to claim 3, wherein said main circuit (31) further comprises a first pressure sensor (3105) and a second pressure sensor (3109), said first pressure sensor (3105) and said second pressure sensor (3109) being connected to said PLC controller (2);
wherein the first pressure sensor (3105) is mounted on an oil passage between the first pilot check valve (3103) and the second ball valve (3104), and the second pressure sensor (3109) is mounted on an oil passage between the fifth ball valve (3108) and the second pilot check valve (3110).
5. The blast furnace top stream adjustment control system according to claim 3, wherein the backup circuit (32) comprises a sixth ball valve (321), a second electromagnetic directional valve (322), a first hydraulic lock (323), a first throttle valve (324), a seventh ball valve (325), an eighth ball valve (326), a second throttle valve (327), a second hydraulic lock (328), and a second check valve (329);
an oil inlet P3 of the second electromagnetic directional valve (322) is communicated with a high-pressure oil supply pipeline P through an oil duct, an oil return port T3 of the second electromagnetic directional valve (322) is communicated with an oil return pipeline T through the oil duct, a second one-way valve (329) is installed on the oil duct between the oil return port T3 and the oil return pipeline T, and an electromagnet Y2a of the second electromagnetic directional valve (322) is connected with a PLC (2);
a first output oil port A3 of the second electromagnetic directional valve (322) is communicated with an oil passage between the second ball valve (3104) and the third ball valve (3106) through a first hydraulic lock (323), a first throttle valve (324) and a seventh ball valve (325) in sequence, and a second output oil port B3 of the second electromagnetic directional valve (322) is communicated with an oil passage between the fourth ball valve (3107) and the fifth ball valve (3108) through a second hydraulic lock (328), a second throttle valve (327) and an eighth ball valve (326) in sequence.
6. The blast furnace top flow regulating and controlling system according to claim 5, wherein each of the first electromagnetic directional valve (3111) and the second electromagnetic directional valve (322) is an external leakage valve.
7. The blast furnace top stream regulating control system according to claim 3, wherein the proportional reversing valve (3102) is an electromagnetic proportional reversing valve or an electro-hydraulic proportional reversing valve.
8. The blast furnace top flow regulating and controlling system according to claim 3, wherein said first hydraulically controlled check valve (3103) and said second hydraulically controlled check valve (3110) are both externally controlled leakage hydraulically controlled check valves.
9. A blast furnace top material flow adjusting and controlling method is characterized in that the control method is based on the blast furnace top material flow adjusting and controlling system of any one of claims 1 to 8, and specifically comprises the following steps:
step one, when the material is normally distributed, the PLC (2) automatically calculates according to the material distribution process and the measured data and then sends a control signal to the hydraulic control loop (3);
step two, after the hydraulic control loop (3) obtains a control signal, the main loop (31) or the standby loop (32) is selected to control the speed and the position of the oil cylinder according to the fault condition;
when the main loop (31) works, an electromagnet Y1c of a first electromagnetic reversing valve (3111) is electrified first, a P2 and a B2 in the first electromagnetic reversing valve (3111) are communicated, hydraulic oil reaches a control port x of a first hydraulic control one-way valve (3103) and a second hydraulic control one-way valve (3110) through a first ball valve (3101) and a first electromagnetic reversing valve (3111), the first hydraulic control one-way valve (3103) and the second hydraulic control one-way valve (3110) are opened, the oil cylinder can act, at the moment, Y1a in the proportional reversing valve (3102) is electrified, P1 and B1 are communicated, A1 and T1 are communicated, the hydraulic oil passes through the first ball valve (3101), the proportional reversing valve (3102), the second hydraulic control one-way valve (3100), the fifth ball valve (3108) and the fourth ball valve (3107) and enters a rod cavity of the oil cylinder, and return oil passes through a rodless cavity, the third ball valve (3106), the second ball valve (3104), the proportional reversing valve (3103) and the proportional reversing valve (3102), The first check valve (3112) flows back to control the oil cylinder to retreat, when Y1B in the proportional reversing valve (3102) is electrified, P1 and A1 are communicated, T1 and B1 are communicated, the oil way is reversed, and the oil cylinder is controlled to advance;
when the standby loop (32) works, Y2a of the second electromagnetic directional valve (322) is electrified, P3 and B3 in the second electromagnetic directional valve (322) are communicated, T3 and A3 are communicated, hydraulic oil flows back through the second electromagnetic directional valve (322), the second hydraulic lock (328), the second throttle valve (327) and the eighth ball valve (326) through the sixth ball valve (321) and enters a rod cavity of the control oil cylinder, return oil flows back through the seventh ball valve (325), the first throttle valve (324), the first hydraulic lock (323), the second electromagnetic directional valve (322) and the second check valve (329), the control oil cylinder retreats, when Y2B of the second electromagnetic directional valve (322) is electrified, P3 and A3 are communicated, T3 and B3 are communicated, the oil circuit is reversed, and the control oil cylinder advances;
and step three, the detection encoder (1) detects and calibrates the position of the oil cylinder and inputs the position into the PLC (2), and the PLC (2) performs correction control on the hydraulic control loop (3) after calculating according to the detection data of the detection encoder (1), so that closed-loop control is formed.
10. The blast furnace top material flow adjusting control method as claimed in claim 9, wherein the control method has a function of automatically detecting a fault, if the proportional directional valve (3102) or the first electromagnetic directional valve (3111) has a fault, the pressure signal detected by the first pressure sensor (3105) or the second pressure sensor (3109) on the corresponding oil circuit is abnormal, the PLC controller (2) performs fault judgment according to the detected pressure signal data, and automatically switches to the second electromagnetic directional valve (322) to perform control, so as to start the standby loop (32), and the PLC controller (2) performs alarm.
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| GB1518385A (en) * | 1976-04-30 | 1978-07-19 | Isc Smelting | Charging of blast furnaces |
| CN202531552U (en) * | 2012-02-23 | 2012-11-14 | 中冶南方工程技术有限公司 | Hydraulic device for automatically switching double insurance of main/ subsidiary continuous pressure feeding oil way |
| CN104745754A (en) * | 2015-04-17 | 2015-07-01 | 中冶赛迪工程技术股份有限公司 | Hydraulic control loop of blast furnace top distributing gear |
| CN111004881A (en) * | 2019-12-31 | 2020-04-14 | 山东钢铁集团日照有限公司 | Control method for blast furnace top material flow valve |
| CN111850207A (en) * | 2020-08-19 | 2020-10-30 | 山东钢铁股份有限公司 | Control system and control method for tilting angle of distribution chute of blast furnace |
| CN212318404U (en) * | 2020-02-27 | 2021-01-08 | 北京首钢股份有限公司 | Blast furnace top hydraulic system control circuit |
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2022
- 2022-01-23 CN CN202210075926.1A patent/CN114410868B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1518385A (en) * | 1976-04-30 | 1978-07-19 | Isc Smelting | Charging of blast furnaces |
| CN202531552U (en) * | 2012-02-23 | 2012-11-14 | 中冶南方工程技术有限公司 | Hydraulic device for automatically switching double insurance of main/ subsidiary continuous pressure feeding oil way |
| CN104745754A (en) * | 2015-04-17 | 2015-07-01 | 中冶赛迪工程技术股份有限公司 | Hydraulic control loop of blast furnace top distributing gear |
| CN111004881A (en) * | 2019-12-31 | 2020-04-14 | 山东钢铁集团日照有限公司 | Control method for blast furnace top material flow valve |
| CN212318404U (en) * | 2020-02-27 | 2021-01-08 | 北京首钢股份有限公司 | Blast furnace top hydraulic system control circuit |
| CN111850207A (en) * | 2020-08-19 | 2020-10-30 | 山东钢铁股份有限公司 | Control system and control method for tilting angle of distribution chute of blast furnace |
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