CN215835342U

CN215835342U - High-voltage frequency conversion control system of sintering equipment

Info

Publication number: CN215835342U
Application number: CN202022880677.2U
Authority: CN
Inventors: 陈勇; 董兴红; 赵特猛; 吴珍辉; 刘忠敏
Original assignee: Guangdong Guangqing Metal Technology Co Ltd
Current assignee: Guangdong Guangqing Metal Technology Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2022-02-15
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a high-voltage frequency conversion control system of sintering equipment, which comprises a controller, an IO board and a human-computer interface, wherein the controller comprises 3 optical fiber boards, 1 signal board, 1 main control board and 1 power board; the man-machine interface provides a friendly full Chinese operation interface for a user, is responsible for information processing and communication with the outside, and can select upper monitoring to realize networked control of the frequency converter; the IO board is used for logic processing of switch signals inside the frequency converter, field operation signals and state signals, and the human-computer interface communicates data transmitted through the main control board and the IO board. The utility model adopts an automatic control method, so that the high-voltage motor of the system can work in a high-speed or low-speed state, energy waste is avoided, compared with a workshop section with higher complexity, the maximum load is taken as a main basis, more electric energy can be saved, the fan of the system is maintained in an optimal state constantly, and the comprehensive production effect is improved.

Description

High-voltage frequency conversion control system of sintering equipment

Technical Field

The utility model relates to the technical field of high-voltage frequency conversion control of sintering equipment, in particular to a high-voltage frequency conversion control system of the sintering equipment.

Background

The sintering production process is that the proportioned and processed sintering materials are paved on a trolley of a sintering machine, a main exhaust fan adopts a high-pressure soft starter to control a motor to start and then operates at power frequency for ignition and forced air draft, fuel in the sintering materials is combusted to generate high temperature under the action of negative pressure generated by air draft of the main exhaust fan, so that local softening and melting are performed, a series of physical and chemical reactions are performed, a certain amount of liquid phase is generated, and then the liquid phase is cooled and solidified into blocks due to temperature reduction.

The mixer is mainly used for uniformly mixing various materials sent from the batching chamber and sending the materials to the next working procedure for granulation. The granulator performs moisture fine adjustment and pelletizing, and under the condition of adding proper moisture, the mixture is granulated, so that the mixture with uniform components, proper moisture and good air permeability is provided for the sintering machine. The two devices drive the roller to rotate through the high-voltage motor, and a high-voltage circuit breaker is adopted to directly start power frequency operation.

However, the main exhaust fan, the granulator and the mixer of the existing sintering workshop of the iron works use high-power 10KV high-voltage motors, the operation is always carried out in a direct start or soft start mode power frequency mode from the start-up, the speed is uncontrollable, the power consumption is high, the starting current is overlarge, the power grid is easily affected when the starting is carried out, and the motor winding can generate heat, so that the insulation aging is accelerated, and the service life of the motor is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that a main exhaust fan, a granulator and a mixer of a sintering workshop of an iron plant in the prior art are all high-power 10KV high-voltage motors and are operated at power frequency in a direct start or soft start mode all the time from production start, and provides a high-voltage variable frequency control system of sintering equipment.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a high-voltage frequency conversion control system of sintering equipment comprises a controller, an IO board and a human-computer interface, wherein the controller comprises 3 optical fiber boards, 1 signal board, 1 main control board and 1 power board; the man-machine interface provides a friendly full Chinese operation interface for a user, is responsible for information processing and communication with the outside, and can select upper monitoring to realize networked control of the frequency converter; the IO board is used for logic processing of switch signals inside the frequency converter, field operation signals and state signals, the human-computer interface calculates parameters such as current, voltage, power and operating frequency through data transmitted by communication between the main control board and the IO board, a meter function is provided, and overload and overcurrent alarm and protection of the motor are achieved.

Preferably, the high-voltage cabinet is further included, and a circuit breaker DL is arranged in the high-voltage cabinet.

Preferably, the system further comprises a bypass cabinet, and a high-voltage frequency converter and a plurality of isolating switches are arranged in the bypass cabinet.

Preferably, a plurality of the isolation switches are K1, K2, K3, K4, K5, K6 and K7, respectively.

Preferably, the K2 and K3, K4 and K5, K6 and K7 are three groups of double-pole double-throw isolating switches respectively.

Preferably, the main circuit switching element is an IGBT.

Preferably, an electrical interlock is further arranged between the high-voltage frequency converter and the circuit breaker DL, and the interlock signal comprises closing locking and fault opening.

Preferably, the human-computer interface is connected with the main control board through an RS232 communication port and is connected with the IO board through an RS485 communication port, and the state of the frequency converter system is monitored in real time.

Has the advantages that:

1. the utility model adopts an automatic control method, so that the high-voltage motor of the system can work in a high-speed or low-speed state, thereby avoiding energy waste;

2. according to the requirements and characteristics of the metallurgical process, the high-precision frequency resolution and the speed regulation precision of the device are utilized to flexibly adapt to different working conditions;

3. the utility model connects the equipment control circuit according to the actual demand to form a part of closed-loop control system, improves the reliability of the system operation, has the functions of power electronic protection and industrial electrical protection, can ensure the safety and stability of the frequency converter and the motor no matter in a normal state or a fault state, can not be damaged, and simultaneously can effectively reduce the starting current and reduce the adverse effect on the power grid during starting to the maximum extent.

Drawings

FIG. 1 is a schematic structural diagram of a bypass cabinet of a high-voltage variable-frequency control system of a sintering apparatus according to the present invention;

FIG. 2 is a schematic structural diagram of a main circuit switching element of a high-voltage variable-frequency control system of a sintering apparatus according to the present invention.

Detailed Description

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.

Referring to fig. 1-2, a high-voltage frequency conversion control system of a sintering device comprises a controller, an IO board and a human-computer interface, wherein the controller comprises 3 optical fiber boards, 1 signal board, 1 main control board and 1 power board; the man-machine interface provides a friendly full Chinese operation interface for a user, is responsible for information processing and communication with the outside, and can select upper monitoring to realize networked control of the frequency converter; the IO board is used for logic processing of internal switch signals of the frequency converter, field operation signals and state signals;

in the embodiment, the main circuit switching element is an IGBT, the human-computer interface calculates parameters such as current, voltage, power, operating frequency and the like through data transmitted by the communication of the main control board and the IO board, provides a meter function, and realizes overload and overcurrent alarm and protection on the motor;

in this embodiment, the human-computer interface is connected with the main control board through an RS232 communication port and connected with the IO board through an RS485 communication port, and monitors the state of the frequency converter system in real time, and further includes a high-voltage cabinet, in which a circuit breaker DL is disposed, and a bypass cabinet, in which a high-voltage frequency converter and a plurality of isolation switches are disposed;

in this embodiment, an electrical interlock is further provided between the high-voltage frequency converter and the circuit breaker DL, and an interlock signal includes a closing lock and a fault opening;

in this embodiment, the plurality of isolation switches are K1, K2, K3, K4, K5, K6 and K7, and the K2, the K3, the K4, the K5, the K6 and the K7 are three groups of double-pole double-throw isolation switches.

In the embodiment, a main exhaust fan is core equipment of a sintering exhaust system, the air quantity is controlled by controlling the opening of an air door of the fan, the electric power of the main exhaust fan is 6600KW, a high-voltage soft starter is adopted to control a motor to start and then to operate at power frequency, a granulator, a mixer and important sintering batching equipment drive a roller to rotate through a high-voltage motor, the power of the motor is 315KW and 500KW respectively, and a high-voltage circuit breaker is adopted to directly start the operation at power frequency;

in this embodiment, the frequency conversion operation: k1, K2, K4 and K5 are closed, K3, K5 and K7 are opened, a closing circuit breaker DL supplies power to the frequency converter, and the frequency converter locally or remotely starts the motor to operate in a frequency conversion mode;

in this embodiment, the soft start operation: k5, k7 is closed, k4 and k6 are opened, and a closing circuit breaker DL supplies power to the soft starter so as to start the motor to run;

in this embodiment, in order to protect the frequency converter, an electrical interlock is further provided between the frequency converter and the breaker DL, and an interlock signal includes a closing lock and a fault opening;

in this embodiment, the high-voltage intelligent energy-saving device adopts an ac-dc-ac direct high-voltage (high-high) mode, and the main circuit switching element is an IGBT. The LPH high-voltage intelligent energy-saving equipment adopts the power units which are connected in series and the superposition wave is boosted, and fully utilizes the mature technology of the constant-voltage frequency converter, so that the LPH high-voltage intelligent energy-saving equipment has high reliability;

in the embodiment, according to the working characteristics of the frequency converter and the motor, automatic control and transformation of the frequency conversion technology are respectively carried out, firstly, the high-voltage frequency converter is installed and locally debugged, the running parameters are optimized to ensure that the motor runs normally, and then, the plc is adopted to control the working frequency of the frequency converter on the basis of the original control and the interlocking condition of equipment is added, so that the function of automatic control of the high-voltage frequency conversion is achieved;

in the embodiment, local control is performed, namely, a liquid crystal touch screen on a high-voltage inverter unit control cabinet is taken as an object, setting of various parameters is completed according to production process requirements, and all control of starting and stopping is executed;

in this embodiment, the frequency converter is controlled by remote control through an industrial personal computer installed in a central control room (see fig. two), and data exchange is performed between the two through an I/O module between the PLCs and a communication digital quantity or analog quantity signal.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a sintering equipment high pressure frequency conversion control system, includes controller, IO board, main circuit switch element and human-computer interface, its characterized in that: the controller comprises 3 optical fiber plates, 1 signal plate, 1 main control plate and 1 power supply plate; the man-machine interface provides a friendly full Chinese operation interface for a user, is responsible for information processing and communication with the outside, and can select upper monitoring to realize networked control of the frequency converter; the IO board is used for logic processing of switch signals inside the frequency converter, field operation signals and state signals, the human-computer interface calculates parameters such as current, voltage, power and operating frequency through data transmitted by communication between the main control board and the IO board, a meter function is provided, and overload and overcurrent alarm and protection of the motor are achieved.

2. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 1, wherein: the high-voltage cabinet is further provided with a circuit breaker DL.

3. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 1, wherein: still include the bypass cabinet, be equipped with high-voltage inverter and a plurality of isolator in the bypass cabinet.

4. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 3, wherein: the isolating switches are respectively K1, K2, K3, K4, K5, K6 and K7.

5. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 4, wherein: the K2 and K3, K4 and K5, and K6 and K7 are three groups of double-pole double-throw isolating switches respectively.

6. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 1, wherein: the main circuit switching element is an IGBT.

7. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 3, wherein: and an electrical interlock is arranged between the high-voltage frequency converter and the circuit breaker DL, and an interlocking signal comprises closing locking and fault opening.

8. The high-voltage frequency conversion control system of the sintering equipment as claimed in claim 1, wherein: the human-computer interface is connected with the main control board through an RS232 communication port and connected with the IO board through an RS485 communication port, and the state of the frequency converter system is monitored in real time.