CN113337659A - Control system and method for variable-speed movement of blast furnace top distributor - Google Patents
Control system and method for variable-speed movement of blast furnace top distributor Download PDFInfo
- Publication number
- CN113337659A CN113337659A CN202110642822.XA CN202110642822A CN113337659A CN 113337659 A CN113337659 A CN 113337659A CN 202110642822 A CN202110642822 A CN 202110642822A CN 113337659 A CN113337659 A CN 113337659A
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- contactor
- frequency converter
- control system
- frequency
- distributor
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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
- C21B7/205—Details concerning the gear-box driving the charge distribution system
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a control system and a control method for variable-speed motion of a blast furnace top distributing device, belonging to the technical field of distributing device control, comprising a forward contactor, a reverse contactor and a frequency converter for controlling the action of a rotary motor of the distributing device, wherein an alternating current power supply is connected with the rotary motor of the distributing device through a closing contactor of the frequency converter, the frequency converter and an output contactor of the frequency converter in sequence; the alternating current power supply is connected with the rotary motor of the distributing device through the forward contactor and the reverse contactor respectively; an I/O terminal of the PLC is respectively connected with a frequency converter closing contactor, a frequency converter output contactor, a distributing device rotating motor, a forward rotating contactor and a reverse rotating contactor; the forward contactor and the reverse contactor form an original power frequency control system, and an interlocking structure is arranged between the original power frequency control system and the output contactor of the frequency converter. The frequency conversion electric control system is added on the basis of the original control system, and the frequency conversion electric control system and the original power frequency control system form interlocking, so that the purpose of frequency conversion control of the distributing device is realized.
Description
Technical Field
The invention belongs to the technical field of control of a distributing device, and particularly relates to a control system and method for variable-speed motion of a blast furnace top distributing device.
Background
The blast furnace top distributor is a core component for realizing accurate distribution of a blast furnace, the daily operation is carried out at a power frequency constant speed, and the operation condition of the blast furnace top distributor directly influences the stability and the smooth operation of the blast furnace. The part is large in size and complex in connection with other equipment, the time required for replacing once reaches about 70 hours, and the production of the blast furnace is seriously influenced. Meanwhile, the distributor is expensive, spare parts are high in cost, and direct and indirect economic losses caused by replacement are large. Analysis and demonstration on faults of the distributor for many times show that the damaged parts in the distributor are mostly caused by fatigue abrasion of the distributor due to continuous high-speed operation. After the normal material distribution of the blast furnace is finished, the coke distribution intermittent time is 120 seconds, the ore distribution intermittent time is 330 seconds, and the material distributor is still in a high-speed running state in the material distribution intermittent time. Therefore, the control mode of the operation of the distributing device is improved, the operation mode of 'intermittent deceleration and normal distribution' is realized, and the method is an effective method for solving the high-speed abrasion of the distributing device.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a control system and a control method for variable-speed motion of a blast furnace top distributing device.
The first purpose of the invention is to provide a control system for the variable-speed motion of a blast furnace top distributing device, which comprises a forward contactor (5), a reverse contactor (6) and a frequency converter (2) for controlling the action of a rotary motor (4) of the distributing device, wherein:
the alternating current power supply is connected with a distributor rotating motor (4) through a frequency converter closing contactor (1), a frequency converter (2) and a frequency converter output contactor (3) in sequence;
the alternating current power supply is connected with the rotary motor (4) of the distributing device through a forward contactor (5) and a reverse contactor (6) respectively;
an I/O terminal of the PLC is respectively and electrically connected with a frequency converter closing contactor (1), a frequency converter (2), a frequency converter output contactor (3), a distributor rotating motor (4), a forward rotating contactor (5) and a reverse rotating contactor (6);
the forward contactor (5) and the reverse contactor (6) form an original power frequency control system, and an interlocking structure is arranged between the original power frequency control system and the frequency converter output contactor (3).
Preferably, the interlock structure is an interlock module disposed within the PLC.
Preferably, the device further comprises a level sensor for acquiring a level signal; the material level sensor comprises a lower limit material level sensor and an upper limit material level sensor; and the material level sensor is electrically connected with an I/O terminal of the PLC.
The second purpose of the invention is to provide a control method for the variable-speed movement of a blast furnace top distributing device, which is realized based on the control system for the variable-speed movement of the blast furnace top distributing device and comprises the following steps:
s1, setting a PLC, setting a frequency converter control system as a main control system, and setting an original power frequency control system as a standby auxiliary control system;
s2, starting the frequency converter by electrifying, and starting to run at a slow speed; when the frequency converter operates at a low speed, the frequency A is switched on; when the device runs rapidly, the frequency A and the frequency B are switched on simultaneously; when the lower limit material level sensor sends a material discharge empty signal, the frequency converter controls the material distributor to operate at a low speed; when the upper limit material level sensor sends a signal from the system to a material line, the frequency converter controls the material distributor to operate to a power frequency rotating speed;
s3, when the frequency converter is powered off and closed, starting the original power frequency control system;
and S4, after the work is finished, closing the frequency converter control system and the original power frequency control system.
Preferably, when the distributor runs at a low speed, the frequency converter controls the distributor rotating motor to run at a speed of 25 Hz.
Preferably, when the distributor runs at the power frequency rotating speed, the frequency converter controls the distributor rotating motor to run at the speed of 50 Hz.
The invention has the advantages and positive effects that:
the frequency conversion electric control system is added on the basis of the original control, and the frequency conversion electric control system and the original power frequency control system form interlocking, so that the purpose of frequency conversion control of the distributing device is realized; through the control system and the control method, the material distributor can run at a low speed in the time without material distribution and at the original power frequency speed during material distribution, so that accurate material distribution is ensured.
Drawings
FIG. 1 is an electrical schematic diagram of a preferred embodiment of the present invention;
fig. 2 is a control schematic diagram of the frequency converter B in the preferred embodiment of the present invention.
Fig. 3 is a PLC program diagram for controlling the frequency conversion operation of the distributor in the preferred embodiment of the invention.
Wherein: 1. switching on a contactor by a frequency converter; 2. a frequency converter; 3. a frequency converter output contactor; 4. a distributor rotating motor; 5. a forward rotation contactor; 6. reversing the contactor; 7. a frequency conversion fault relay; 8. frequency conversion forward rotation signals; 9. frequency-converting the inverted signal;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Please refer to fig. 1 to 3.
The utility model provides a control system of blast furnace top distributing device variable speed motion, is including corotation contactor 5, reversal contactor 6 and the converter 2 of 4 actions of control distributing device rotating electrical machines, wherein:
the alternating current power supply is connected with a distributing device rotating motor 4 through a frequency converter closing contactor 1, a frequency converter 2 and a frequency converter output contactor 3 in sequence;
the alternating current power supply is connected with the distributing device rotating motor 4 through the forward rotating contactor 5 and the reverse rotating contactor 6 respectively;
an I/O terminal of the PLC is respectively and electrically connected with a frequency converter closing contactor 1, a frequency converter 2, a frequency converter output contactor 3, a distributing device rotating motor 4, a forward rotating contactor 5, a reverse rotating contactor 6 and a frequency conversion fault relay 7;
the forward contactor 5 and the reverse contactor 6 form an original power frequency control system, and an interlocking structure is arranged between the original power frequency control system and the frequency converter output contactor 3.
The interlocking structure is an interlocking module arranged in the PLC.
The device also comprises a material level sensor for acquiring a material level signal; the material level sensor comprises a lower limit material level sensor and an upper limit material level sensor; and the material level sensor is electrically connected with an I/O terminal of the PLC.
Referring to fig. 2, the I/O terminal of the PLC can transmit the following signals: fault reset 10, frequency a11, frequency B12, frequency converter set signal 13, frequency converter feedback signal 14, frequency converter input impedance 15, and frequency converter output impedance 16.
The invention adds a set of frequency conversion electric control system on the basis of the original control, which comprises a frequency converter closing contactor 1, a frequency converter 2 and a frequency converter output contactor 3, and realizes the intermittent variable speed movement of a rotary motor 4 of a distributing device by recompiling and designing a PLC program.
The variable frequency control system and the original power frequency control system form interlocking, and one of the two is selected. In production, the control of a frequency converter control system is mainly used, and an original power frequency control system is a standby auxiliary control system. When the frequency converter 2 is selected for control, the frequency converter closing contactor 3 and the forward rotation contactor 5 and the reverse rotation contactor 6 in the original power frequency loop form electrical interlocking, namely when the frequency converter output contactor 3 is closed, the forward rotation contactor 5 and the reverse rotation contactor 6 in the original power frequency loop are in linkage disconnection, after the frequency converter closing contactor 1 is closed, the frequency converter 2 is powered on to start, and the frequency converter 2 starts to run at a low speed. When the frequency converter 2 operates at a slow speed, the frequency A11 is switched on; in fast operation, frequency A11 and frequency B12 are simultaneously turned on. When the rotary motor 4 of the distributing device rotates forwards, the variable-frequency forward rotation signal 8 is switched on; when the inversion is performed, the frequency conversion inversion signal 9 is turned on. In production, when the frequency converter 2 is selected to run automatically, the program automatically executes the switching between slow motion and fast motion. According to the PLC control program, when a material empty signal is sent out by a central bin at the top of the furnace, the program outputs a speed reduction command, and the distributing device runs at a low speed; when the furnace top sends a 'system to stockline' signal, the program outputs a speed-up command, and the distributor quickly runs to a power frequency rotating speed to meet the condition of normal distribution. Through above control mode, realize the distributing device in the time of not having the cloth low-speed operation, with former power frequency speed operation when the cloth, ensure accurate cloth.
In normal production operation, when a material empty signal is sent out by a central bin at the top of the furnace, a program outputs a speed reduction command, a PLC sends a low-speed operation command to a frequency converter 2, and the frequency converter 2 controls a material distributor rotating motor 4 to operate at a speed of 25Hz, so that the material distributor rotates at a low speed. When the furnace top sends a signal from a system to a material line, the program outputs a high-speed command, the PLC sends a speed-up running command to the frequency converter 2, and the frequency converter 2 controls the material distributor rotating motor 4 to run at the speed of 50Hz, so that the material distributor rotates at the normal material distribution speed.
The method reduces the rotating speed of the distributing device by using the distributing intermission time, effectively reduces the abrasion loss of core parts of the distributing device, and prolongs the service life of the distributing device. The monitoring of the temperature of the distributing device shows that the average running temperature of the distributing device before modification is 47 ℃, and the average running temperature after modification can be kept at about 34 ℃, so that the wear degree of the distributing device is obviously reduced, and the failure rate is reduced. Meanwhile, according to the use condition of lubricating oil in the distributor, the oiling interval time of the lubricating oil of the furnace top intelligent system is properly prolonged, the lubricating cost is saved, and the frequency conversion and electricity saving operation are realized.
A control method for the variable-speed movement of a blast furnace top distributing device is realized based on the control system for the variable-speed movement of the blast furnace top distributing device, and comprises the following steps:
s1, setting a PLC, setting a frequency converter control system as a main control system, and setting an original power frequency control system as a standby auxiliary control system;
s2, starting the frequency converter by electrifying, and starting to run at a slow speed; when the frequency converter operates at a low speed, the frequency A is switched on; when the device runs rapidly, the frequency A and the frequency B are switched on simultaneously; when the lower limit material level sensor sends a material discharge empty signal, the frequency converter controls the material distributor to operate at a low speed; when the upper limit material level sensor sends a signal from the system to a material line, the frequency converter controls the material distributor to operate to a power frequency rotating speed;
s3, when the frequency converter is powered off and closed, starting the original power frequency control system;
and S4, after the work is finished, closing the frequency converter control system and the original power frequency control system.
When the distributing device runs at a low speed, the frequency converter controls the rotating motor of the distributing device to run at a speed of 25 Hz.
When the distributor operates at the power frequency rotating speed, the frequency converter controls the rotary motor of the distributor to operate at the speed of 50 Hz.
A fast condition module and a slow condition module are preset in the PLC, wherein: the fast condition module corresponds to a stockline signal, and the slow condition module corresponds to a large bunker empty signal; when the sensor detects a stockline signal, the PLC starts the rapid condition module, and when the sensor detects a large bunker empty signal, the PLC starts the slow condition module.
In the technical scheme: when the control system receives a stockline signal, the rapid condition is automatically met, the fixed frequency 1 and the fixed frequency 2 are output at the moment, namely, the distributor keeps high-speed operation, and the frequency converter controls the rotary motor of the distributor to operate at the speed of 50 Hz. When the large bunker is empty, the low-speed condition is automatically powered on, the frequency converter runs at the low speed of 25HZ, and meanwhile, the fixed frequency 2 is quickly powered off and reset to 0.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (6)
1. A control system for the variable speed movement of a blast furnace top distributing device comprises a forward contactor (5) and a reverse contactor (6) which control the action of a rotary motor (4) of the distributing device; characterized in that, still include converter (2) at least, wherein:
the alternating current power supply is connected with a distributor rotating motor (4) through a frequency converter closing contactor (1), a frequency converter (2) and a frequency converter output contactor (3) in sequence;
the alternating current power supply is connected with the rotary motor (4) of the distributing device through a forward contactor (5) and a reverse contactor (6) respectively;
an I/O terminal of the PLC is respectively and electrically connected with a frequency converter closing contactor (1), a frequency converter (2), a frequency converter output contactor (3), a distributor rotating motor (4), a forward rotating contactor (5) and a reverse rotating contactor (6);
the forward contactor (5) and the reverse contactor (6) form an original power frequency control system, and an interlocking structure is arranged between the original power frequency control system and the frequency converter output contactor (3).
2. The control system for variable speed movement of a blast furnace top distributor as defined in claim 1 wherein said interlocking structure is an interlocking module disposed in a PLC.
3. The control system for variable speed movement of a blast furnace top distributor as defined in claim 1 or 2 further comprising a level sensor for acquiring a level signal; the material level sensor comprises a lower limit material level sensor and an upper limit material level sensor; and the material level sensor is electrically connected with an I/O terminal of the PLC.
4. A control method for variable speed movement of a blast furnace top distributor, which is realized based on the control system for variable speed movement of a blast furnace top distributor as claimed in any one of claims 1 to 3, and comprises the following steps:
s1, setting a PLC, setting a frequency converter control system as a main control system, and setting an original power frequency control system as a standby auxiliary control system;
s2, starting the frequency converter by electrifying, and starting to run at a slow speed; when the frequency converter operates at a low speed, the frequency A is switched on; when the device runs rapidly, the frequency A and the frequency B are switched on simultaneously; when the lower limit material level sensor sends a material discharge empty signal, the frequency converter controls the material distributor to operate at a low speed; when the upper limit material level sensor sends a signal from the system to a material line, the frequency converter controls the material distributor to operate to a power frequency rotating speed;
s3, when the frequency converter is powered off and closed, starting the original power frequency control system;
and S4, after the work is finished, closing the frequency converter control system and the original power frequency control system.
5. The method of controlling the variable speed movement of a blast furnace top distributor as defined in claim 4 wherein the distributor is operated at a low speed when the large bunker empty point is issued and the frequency converter controls the operation of the rotary electric motor of the distributor at a speed of 25 Hz.
6. The method of controlling the variable speed movement of a blast furnace top distributor as defined in claim 4 wherein the frequency converter operates at 50Hz to control the operation of the rotary electric motor of the distributor when the distributor is operating at commercial power speeds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110642822.XA CN113337659A (en) | 2021-06-09 | 2021-06-09 | Control system and method for variable-speed movement of blast furnace top distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110642822.XA CN113337659A (en) | 2021-06-09 | 2021-06-09 | Control system and method for variable-speed movement of blast furnace top distributor |
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| Publication Number | Publication Date |
|---|---|
| CN113337659A true CN113337659A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110642822.XA Pending CN113337659A (en) | 2021-06-09 | 2021-06-09 | Control system and method for variable-speed movement of blast furnace top distributor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545841A (en) * | 2022-03-11 | 2022-05-27 | 四川水利职业技术学院 | Water inlet gate control system with runner protection and energy storage type small hydropower station unit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010059499A (en) * | 1999-12-30 | 2001-07-06 | 이구택 | System for estimating the abnormalty of the blast furnace |
| CN202265587U (en) * | 2011-08-30 | 2012-06-06 | 中国三冶集团有限公司电气安装工程公司 | Blast furnace chute rotation automatic control device |
-
2021
- 2021-06-09 CN CN202110642822.XA patent/CN113337659A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010059499A (en) * | 1999-12-30 | 2001-07-06 | 이구택 | System for estimating the abnormalty of the blast furnace |
| CN202265587U (en) * | 2011-08-30 | 2012-06-06 | 中国三冶集团有限公司电气安装工程公司 | Blast furnace chute rotation automatic control device |
Non-Patent Citations (1)
| Title |
|---|
| 庞顺清: "天铁2800m~3高炉炉顶布料器旋转变速运动设计及应用", 《天津冶金》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545841A (en) * | 2022-03-11 | 2022-05-27 | 四川水利职业技术学院 | Water inlet gate control system with runner protection and energy storage type small hydropower station unit |
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Application publication date: 20210903 |
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