CN217362580U

CN217362580U - Smelting pressure regulating control system

Info

Publication number: CN217362580U
Application number: CN202220753327.6U
Authority: CN
Inventors: 俞龙�; 周世龙; 刘念培; 樊金金; 张文帅; 蔡立志
Original assignee: Wuhu Truchum Alloy Copper Co ltd
Current assignee: Wuhu Truchum Alloy Copper Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-09-02
Anticipated expiration: 2032-03-31

Abstract

One or more embodiments of the present specification provide a smelting voltage regulation control system, which solves the problems of electric sparks and non-stepless regulation caused by voltage regulation by arranging a contactor and a capacitor in a traditional power frequency smelting voltage regulation cabinet by arranging a one-way silicon controlled rectifier controller, and in order to solve the problem of unbalanced current caused by the one-way silicon controlled rectifier, an SVG reactive compensation device is arranged to compensate a circuit, and in order to solve the problem that the SVG reactive compensation device is easy to burn out in the use process, an inductive resistor serving as a power resistor in the original circuit is converted into a resistive resistor.

Description

Smelting pressure regulating control system

Technical Field

One or more embodiments of the present description relate to the technical field of smelting furnace control, and in particular, to a smelting pressure regulation control system.

Background

In the working process of the smelting furnace, in order to keep the smelting temperature constant, the voltage of a smelting coil needs to be regulated, a traditional smelting voltage regulating system is characterized in that a voltage regulating transformer, a plurality of alternating current contactors and a plurality of capacitors are arranged in a voltage regulating cabinet, the voltage regulation of the smelting furnace is realized, when the voltage regulation is carried out each time, the contactors are switched with loads and generate electric sparks (arc discharge phenomenon), great hidden dangers are brought to the safety of the voltage regulating system, the regulating amplitude is related to the set number of the contactors and the tap number of the voltage regulators, stepless regulation cannot be realized, in order to guarantee the stability of the smelting temperature, a worker always needs to pay attention to the real-time temperature of the smelting furnace, the contactor is repeatedly switched on and switched off to regulate the voltage, manpower is consumed, and the service life of the whole equipment can be damaged. When the smelting furnace is in operation, the three-phase imbalance is serious, the power factor is low, and the influence on a workshop transformer is large, so that a safer and more reasonable smelting voltage regulating system is needed.

Disclosure of Invention

In view of the above, an object of one or more embodiments of the present disclosure is to provide a smelting pressure regulation control system, so as to solve all or one of the above-mentioned technical problems.

Based on the above purpose, one or more embodiments of the present specification provide a smelting voltage regulation control system, which includes an incoming line circuit, where the incoming line circuit is connected to a first branch circuit, a phase a of the first branch circuit is connected to a first unidirectional thyristor controller, an output end of the first unidirectional thyristor controller and a phase C of the first branch circuit are connected to a first load circuit, the first load circuit is connected to a first smelting coil, and the first load circuit is further connected to a first power resistor at an upper end of the first smelting coil;

the inlet wire circuit is connected with SVG reactive power compensation device in the upper end of first branch road, and SVG reactive power compensation device is parallelly connected with first branch road, and first power resistance is resistive resistor.

Preferably, the system further comprises a second branch circuit, the second branch circuit is connected to the incoming line circuit after being connected in parallel with the first branch circuit, the phase a of the second branch circuit is connected with a second one-way thyristor controller, the output end of the second one-way thyristor controller and the phase C of the second branch circuit are connected to a second load circuit together, the second load circuit is connected to the second smelting coil, the second load circuit is further connected with a second power resistor at the upper end of the second smelting coil, and the second power resistor is a resistance resistor.

Preferably, an incoming line breaker is connected in the incoming line circuit, a first branch breaker and a second branch breaker are connected in the first branch circuit and the second branch circuit respectively, a first alternating current contactor is further connected between the first branch breaker and the first unidirectional silicon controlled controller in series, and a second alternating current contactor is further connected between the second branch breaker and the second unidirectional silicon controlled controller in series.

Preferably, the first alternating current contactor and the second alternating current contactor are 4-pole contactors, the A phases of the first branch circuit and the second branch circuit are connected to two poles of the 4-pole contactors, and then connected to corresponding one-way silicon controlled controllers after being connected in parallel from the wire outlet ends of the two poles, and the C phases of the first branch circuit and the second branch circuit are connected to the other two poles of the 4-pole contactors, and then connected to corresponding load circuits after being connected in parallel from the wire outlet ends of the two poles.

Preferably, the SVG reactive power compensation device comprises a plurality of three-pole molded case circuit breakers connected in parallel, the wire inlet end of each three-pole molded case circuit breaker is connected to the wire inlet circuit, the wire outlet end is connected with an SVG reactive power compensator respectively, an insulated gate bipolar transistor is arranged inside the SVG reactive power compensator, and the SVG reactive power compensator utilizes the internal insulated gate bipolar transistor to transmit reverse harmonic waves, so that the distortion rate of the power waveform accords with the set standard, and the three-phase current is balanced.

Preferably, the incoming line circuit is also connected in parallel with a multi-rate meter.

Preferably, the system also comprises a PID controller, the input end of the PID controller is connected with a temperature sensor, the temperature sensor is installed in the smelting furnace, and the output end of the PID controller is connected to the first one-way controllable silicon controller for input.

Preferably, the rated power of the SVG reactive power compensator is selected to be 5-8 times of the rated power of the smelting furnace.

From the above, it can be seen that the smelting voltage regulation control system provided in one or more embodiments of the present specification solves the problems of electric sparks and non-stepless regulation caused by voltage regulation by arranging a contactor and a capacitor in a traditional power frequency smelting voltage regulation cabinet by arranging the one-way thyristor controller, and solves the problem of unbalanced current caused by the one-way thyristor, and the SVG reactive power compensation device is arranged to compensate the circuit.

Drawings

In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.

Fig. 1 is a schematic circuit diagram of a smelting pressure regulating control system according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure is further described in detail below with reference to specific embodiments.

It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The embodiment of the specification provides a smelting voltage-regulating control system which comprises an incoming line circuit, wherein the incoming line circuit is connected with a first branch circuit, a phase A of the first branch circuit is connected with a first one-way thyristor controller, the output end of the first one-way thyristor controller and a phase C of the first branch circuit are jointly connected to a first load circuit, the first load circuit is connected to a first smelting coil, and the upper end of the first smelting coil of the first load circuit is further connected with a first power resistor R1;

the upper end of the first branch of the incoming line circuit is connected with an SVG reactive power compensation device, and the reactive power compensation device is connected with the first branch in parallel;

the first power resistor R1 is a resistive resistor.

The smelting voltage regulation control system that this description embodiment provided through setting up one-way silicon controlled rectifier controller, solves the electric spark that sets up contactor and electric capacity in traditional power frequency smelting voltage regulation cabinet and carry out the pressure regulating and bring, can't the problem of electrodeless regulation, for the current unbalance problem that solves one-way silicon controlled rectifier and bring, has set up SVG reactive power compensator, compensates the circuit, for solving SVG reactive power compensator in the problem of burning out easily in the use, with the inductive resistance who is power resistance in the original circuit transform resistance into resistance.

As an implementation mode, the system further comprises a second branch circuit, the second branch circuit is connected to the incoming line circuit after being connected in parallel with the first branch circuit, a phase a of the second branch circuit is connected with a second one-way thyristor controller, an output end of the second one-way thyristor controller and a phase C of the second branch circuit are connected to a second load circuit, the second load circuit is connected to the second smelting coil, and a second power resistor R2 is further connected to the upper end of the second smelting coil of the second load circuit.

The first power resistor R1 and the second power resistor R2 are both resistive resistors.

Through the setting, this system can carry out the pressure regulating control to two loads simultaneously, two sets of smelting coils promptly, and is same, when needs pressure regulating control multiunit smelting coil, also can set up multiunit branch road, one-way silicon controlled rectifier controller according to the same mode.

As an implementation manner, an incoming line breaker QF1 is connected in an incoming line circuit, a first branch breaker QF2 and a second branch breaker QF3 are connected in a first branch and a second branch respectively, a first alternating current contactor KM1 is further connected between the first branch breaker QF2 and the first unidirectional thyristor controller in series, and a second alternating current contactor KM2 is further connected between the second branch breaker QF3 and the second unidirectional thyristor controller in series.

Through setting up first branch circuit breaker QF2, second branch circuit breaker QF3, first ac contactor KM1 and second ac contactor KM2, can control the operating condition of first branch road and second branch road respectively, improve this voltage regulation control system's security.

As an embodiment, the first ac contactor KM1 and the second ac contactor KM2 are both 4-pole contactors, the a phase of the first branch and the second branch is connected to two poles of the 4-pole contactors, and then connected to the corresponding one-way thyristor controller in parallel from the outlet ends of the two poles, and the C phase of the first branch and the second branch is connected to the other two poles of the 4-pole contactors, and then connected to the corresponding load circuit in parallel from the outlet ends of the two poles.

Generally speaking, two poles of earth that A is connected are adjacent to each other, and two poles of earth that C is connected are adjacent to each other equally, through the above-mentioned setting, can conveniently get to open and stop the automatic control of this system two branch roads, also can guarantee that the work of one-way thyristor controller and load is synchronous.

As an embodiment, SVG reactive power compensator includes a plurality of parallelly connected tripolar moulded case circuit breakers, each tertiary moulded case circuit breaker's inlet wire termination to inlet wire circuit, outlet wire end are connected with an SVG reactive power compensator respectively, SVG reactive power compensator is inside to be provided with insulated gate bipolar transistor, SVG reactive power compensator still can be through setting up sensor detection power quality and utilizing inside Insulated Gate Bipolar Transistor (IGBT) transmission reverse harmonic, makes the distortion rate of power waveform accord with the settlement standard like national standard to make three-phase current balance.

Through the setting, the stability of SVG reactive power compensator during operation can be improved to when load power is great, too many SVG reactive power compensators can be started simultaneously and work.

As an implementation mode, the incoming line circuit is also connected with a multi-rate meter JLY in parallel, and the power consumption and the electricity utilization cost of the system can be measured.

As an implementation mode, the system further comprises a PID controller, wherein the input end of the PID controller is connected with a temperature sensor, the temperature sensor is installed in the smelting furnace, and the output end of the PID controller is connected to the first one-way controllable silicon controller for input.

Through the arrangement, the working voltage of the smelting coil can be adjusted in real time, so that the temperature in the smelting furnace is kept stable, stepless voltage regulation and stepless temperature regulation can be realized by adjusting the voltage through the one-way silicon controlled controller, and compared with the traditional mode that the temperature can be adjusted only according to gears, the device greatly improves the convenience and ensures better smelting effect.

As an implementation mode, the SVG reactive power compensator can be selected as an integrated product, so that the debugging of technicians is facilitated, the inductive load lagging power needs to be amplified, the product is selected according to 5-8 times of the rated power of a melting furnace, the SVG reactive power compensator is different in brand and parameter codes, parameters need to be adjusted to be 0-24 ma in a given mode, the maximum output is set according to a field process, the response speed (acceleration and deceleration time) is set according to the process, and communication parameters are set.

For example, the QF1 can be selected from NXM-1000A/3P type electric circuit breakers, the QF2 and the QF3 are plastic shell type NXM-630A/3P type circuit breakers, the multi-rate meters are selected from DTSF666 three-phase meters, the KM1 and the KM2 are selected from 400A-4P specifications, the one-way thyristor controller is selected from JS3K-1PH-0V10-1000A type thyristor controllers, and the R1 and the R2 are both selected from RXG24-500 type power resistors.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.

In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure one or more embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the understanding of one or more embodiments of the present description, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the one or more embodiments of the present description will be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that one or more embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit or scope of the disclosure are intended to be included within the scope of the disclosure.

Claims

1. A smelting voltage regulation control system is characterized by comprising a wire inlet circuit, wherein the wire inlet circuit is connected with a first branch circuit, the A phase of the first branch circuit is connected with a first one-way silicon controlled controller, the output end of the first one-way silicon controlled controller and the C phase of the first branch circuit are connected to a first load circuit together, the first load circuit is connected to a first smelting coil, and the upper end of the first smelting coil of the first load circuit is also connected with a first power resistor;

the inlet wire circuit is in the upper end of first branch road is connected with SVG reactive power compensator, SVG reactive power compensator with first branch road is parallelly connected, first power resistor is resistive resistance.

2. The smelting voltage-regulating control system of claim 1, wherein the system further comprises a second branch circuit, the second branch circuit is connected to the incoming line circuit after being connected in parallel with the first branch circuit, the A phase of the second branch circuit is connected with a second one-way thyristor controller, the output end of the second one-way thyristor controller and the C phase of the second branch circuit are connected to a second load circuit together, the second load circuit is connected to the second smelting coil, the second load circuit is arranged at the upper end of the second smelting coil and is further connected with a second power resistor, and the second power resistor is a resistance resistor.

3. The smelting voltage-regulating control system according to claim 2, wherein an incoming line breaker is connected in the incoming line circuit, a first branch breaker and a second branch breaker are connected in the first branch circuit and the second branch circuit respectively, a first alternating current contactor is further connected in series between the first branch breaker and the first unidirectional silicon controlled controller, and a second alternating current contactor is further connected in series between the second branch breaker and the second unidirectional silicon controlled controller.

4. The smelting voltage regulation control system according to claim 3, wherein the first AC contactor and the second AC contactor are 4-pole contactors, the A phases of the first branch circuit and the second branch circuit are connected to two poles of the 4-pole contactors, the A phases of the first branch circuit and the second branch circuit are connected to corresponding one-way thyristor controllers after being connected to the lead-out ends of the two poles in parallel, and the C phases of the first branch circuit and the second branch circuit are connected to the other two poles of the 4-pole contactors, and the C phases of the two poles are connected to corresponding load circuits after being connected to the lead-out ends of the two poles in parallel.

5. The smelting voltage regulation control system of claim 1, wherein the SVG reactive power compensation device includes a plurality of parallelly connected three-pole molded case circuit breakers, each the inlet wire termination of three-pole molded case circuit breaker is connected to the inlet wire circuit, and the outlet wire end is connected with an SVG reactive power compensator respectively, the inside insulated gate bipolar transistor that is provided with of SVG reactive power compensator, SVG reactive power compensator utilizes inside insulated gate bipolar transistor to transmit reverse harmonic, makes the distortion rate of power supply waveform accord with the settlement standard to make three-phase current balance.

6. The smelting pressure regulating control system of claim 1, wherein the incoming line circuit is further coupled in parallel with a multi-rate meter.

7. The smelting pressure regulating control system according to claim 1, further comprising a PID controller, wherein an input end of the PID controller is connected with a temperature sensor, the temperature sensor is installed in the smelting furnace, and an output end of the PID controller is connected to the first one-way thyristor controller for input.

8. The smelting voltage regulation control system of claim 1, wherein the rated power of the SVG reactive power compensator is selected to be 5-8 times the rated power of the smelting furnace.