KR101790213B1 - Control appratus and control method - Google Patents

Abstract

A control device is disclosed. In one embodiment, the control device controls a degree of opening of a plurality of pressure control valves connected to a plurality of exhaust pipes for exhausting the air to supply air to the hot air path, A receiver for receiving a load value of each of a plurality of fans that supply air; A control unit for calculating a plurality of correction values for equalizing the load values of the plurality of fans received and outputting control signals for controlling the opening degrees of the plurality of pressure control valves reflecting the correction values; And an output unit transmitting the control signal to the plurality of pressure control valves.

Description

[0001] CONTROL APPRATUS AND CONTROL METHOD [0002]

The present invention relates to a control apparatus and a control method, and more particularly , to a control apparatus and a control method for controlling both a pressure and a load.

Referring to FIG. 1, which is an explanatory diagram of a conventional hot airflow control process, generally, a blowing unit including a hot air path is installed beside the blast furnace 1. The blowing device is a device for supplying the accumulated heat while blowing cold air (about 180 ° C) through the hot air path (about 1300 ° C) and supplying the accumulated heat to the blast furnace 1 through the lower air hole of the blast furnace 1 to be.

In such a blowing apparatus, the combustion process and the blowing process are replaced at regular intervals. In the combustion process, hot air is stored in the heat storage room 3 of the hot air path while air is burned by the mixed gas in the combustion chamber 2 of the hot air path , And the exhaust gas from the heat storage chamber (3) is discharged to the chimney (4) through the combustion valve. Further, the blowing step is provided to the blast furnace 1 after the cold air is accumulated in the heat accumulating chamber 3 as hot air and is controlled at the output temperature in the mixed air chamber 5 through the combustion chamber 2 later.

That is, if cold air is blown in the air blowing chamber 6, it passes through the cold air valve, the regenerator 3 and the combustion chamber 2 to be converted into hot air, and the changed hot air is blown into the blast furnace 1.

With regard to the combustion of the combustion chamber 2, air and gas are supplied to the combustion chamber 2 to be burned, and the gas is supplied to the combustion chamber 2 through the gas supply part 7.

On the other hand, air is sucked through the suction port 8 and supplied to the lower portion of the combustion chamber 2 through the fans 10-1, 10-2, and 10-3. The air supplied to the combustion chamber 2 by the shutoff valves 12-1, 12-2, and 12-3 can be shut off. The air sucked through the suction port 8 is supplied to the combustion chamber 2 of the hot air path through the exhaust pipe by the operation of the fans 10-1, 10-2 and 10-3.

The pressure supplied to the combustion chamber 2 through the pressure transmitter 11 is input to the conventional control device 30. [ The conventional control device 30 controls the pressure control valves 9-1, 9-2, 9-3, 9-3, 9-3, 9-3, 9-3, 9-3, and 9-3, taking into account the pressure set value input by the driver 20 and the pressure input through the pressure transmitter 11. [ To the pressure control valves 9-1, 9-2, and 9-3.

At this time, all of the fans 10-1, 10-2, and 10-3 are operated regardless of the load of the fans 10-1, 10-2, and 10-3 by the pressure setting value by the driver 20 And the motor in the fans 10-1, 10-2, and 10-3 is operated at a rated current or more. The operating strengths of the plurality of fans 10-1, 10-2, and 10-3 are changed according to the opening degree of the pressure control valves 9-1, 9-2, and 9-3, 1, 10-2, and 10-3) may vary. This causes the motor to burn out of the fan.

Further, the plurality of pressure control valves 9-1, 9-2, and 9-3 receive the same control signal from the conventional controller 30 and are controlled at the same opening degree. Therefore, there is a problem that the pressure supplied to the combustion chamber 2 can not be controlled by the pressure setting value by the driver 20. [

As a result, there is a problem that heat storage is not smoothly performed and the blast furnace fuel cost rises. Further, there arises an additional problem that the pulverized coal production facility using the waste gas generated in the combustion is stopped.

An object of the present invention is to provide a control apparatus and a control method for controlling the opening degree of a pressure control valve for supplying air of a hot air path so as to be adjusted to a set pressure value while making a load value of the fan even.

A control device according to an embodiment of the present invention controls opening of a plurality of pressure control valves connected to a plurality of exhaust pipes for exhausting air to supply air to a hot air path, A receiver for receiving a load value of each of a plurality of fans connected to supply the air; A control unit for calculating a plurality of correction values for equalizing the load values of the plurality of fans received and outputting control signals for controlling the opening degrees of the plurality of pressure control valves reflecting the correction values; And an output unit transmitting the control signal to the plurality of pressure control valves.

The load value may be a current value flowing in the motor of the fan.

The correction value may be a value that determines a tone / amount of a trim value within a predetermined range from a deviation of a load value of each of the plurality of fans.

The control signal may add the correction value to the pressure output value.

When the deviation of the load value is negative, the trim value may be positive.

If the deviation of the load value is positive, the trim value may be negative.

A control method according to an embodiment of the present invention includes: receiving a load value of each of a plurality of fans connected to the plurality of exhaust pipes to supply the air; Calculating a plurality of correction values for equalizing a load value of each of the plurality of received fans; Outputting a control signal for controlling an opening degree of the plurality of pressure control valves reflecting the correction value; And transmitting the control signal to the plurality of pressure control valves.

The calculating step may include determining a tone / amount of a trim value in a predetermined range from a deviation of a load value of each of the plurality of fans.

The present invention relates to a control device and a control method for supplying air to a hot air path, and more particularly, to a control device and a control method for controlling the pressure control valve so as to have a desired pressure value while adjusting a load value of a fan Control device, and control method.

Thereby, the load value of the fan can be controlled under the optimum condition so that the overload does not occur in the fan, and the failure of the fan can be prevented.

In addition, it is possible to individually control the opening degrees of the plurality of pressure control valves and control the pressure of the air supplied to the desired hot air path to a desired pressure. Thus, heat storage of the hot air path can be facilitated, and the fuel efficiency can be improved. As a result, the blast furnace fuel cost can be reduced.

In addition, the pulverized coal manufacturing facility using the waste gas generated at the time of combustion can be operated smoothly, and the resource efficiency can be improved.

1 is an explanatory view of a conventional hot air path control process.
FIG. 2 is an explanatory diagram of a hot air path control process according to an embodiment of the present invention.
3 is a block diagram of a control apparatus according to an embodiment of the present invention.
FIG. 4 is a graph of a current value in each fan with respect to time according to a conventional hot air path control process.
5 is a graph showing a current value and an opening degree of each fan with respect to time according to a hot air path control process according to an embodiment of the present invention.
6 is a flowchart of a control method according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 2 is an explanatory diagram of a hot air path control process according to an embodiment of the present invention, and FIG. 3 is a block diagram of a control apparatus according to an embodiment of the present invention.

2 and 3, the controller 100 according to an embodiment of the present invention includes a controller 100, A receiving unit 110, a control unit 120, and an output unit 130.

Unlike the related art, the receiving unit 110 receives a load value from each of the plurality of fans 10-1, 10-2, and 10-3. Hereinafter, the case of three fans will be described.

In one embodiment, the load value is converted into a current value for the motors of the fans 10-1, 10-2, and 10-3 by measurement of an ammeter or the like, and can be received by the receiving unit 110. [ And the range of the current value may be 0A to 100A. Here, 0A may mean that the fans 10-1, 10-2, and 10-3 do not operate. Thus, the load values of the fans 10-1, 10-2, 10-3 are reflected from the load values applied to the motors of the fans 10-1, 10-2, 10-3, ). ≪ / RTI > For example, the receiving unit 110 may transmit a current value to the motors of the fans 10-1, 10-2, and 10-3 to the controller 120. [

The control unit 120 receives the load value from the receiving unit 110 and calculates a correction value for equalizing the load value of each of the fans 10-1, 10-2, and 10-3. The control unit 120 performs control that reflects the calculated correction value A signal can be transmitted to the output unit 130.

The control unit 120 includes a load value input unit 121, a movable fan determination unit 122, a deviation calculation unit 123, a correction value calculation unit 124, a pressure control unit 125, and a control signal calculation unit 126 can do.

The load value input unit 121 receives the load values of the fans 10-1, 10-2, and 10-3 from the receiving unit 110 and calculates the correction values using the respective fans 10-1 and 10-2 , 10-3 can be transmitted to the movable-pan determination unit 122 and the deviation calculation unit 123, respectively.

The movable fan determination unit 122 can determine the active fans 10-1, 10-2, and 10-3 and the non-active fans 10-1, 10-2, and 10-3. As described above, for example, when the current value for the motors of the fans 10-1, 10-2, and 10-3 is 0A, the motor can be judged to be in the unactuated state. The determination on the operating fans 10-1, 10-2, and 10-3 and the operating fans 10-1, 10-2, and 10-3 may be transmitted to the deviation calculating unit 123. [ Whether the fans 10-1, 10-2, and 10-3 are operated or not can be received through the electric signals from the fans 10-1, 10-2, and 10-3.

Further, for example, two of the three fans 10-1, 10-2, and 10-3 are in operation, and one of them may be used as a spare.

The deviation calculator 123 calculates an average of the load values received from the load value input unit 121 and then subtracts an average of the load values from the load values of the fans 10-1, 10-2, and 10-3 , It is possible to calculate the deviation with respect to the load value of each of the fans 10-1, 10-2, and 10-3. Here, the average of the load values is calculated by applying the judgment on the movable fans 10-1, 10-2, and 10-3 received from the movable fan determination unit 122. [ For example, the load values for the operating fans 10-1, 10-2, and 10-3 are summed up, and the summed load values are multiplied by the number of the operating fans 10-1, 10-2, and 10-3 The average of the load values can be calculated. That is, in calculating the average of the load values, the fans 10-1, 10-2, and 10-3 that are not in operation are not reflected.

The correction value calculation unit 124 can calculate a correction value obtained by multiplying the current opening degree of the plurality of pressure control valves 9-1, 9-2, 9-3 connected to a plurality of exhaust pipes for exhausting air by the trim value have. In one example, the opening may range from 0% to 100%. Here, 0% is a state in which the pressure control valves 9-1, 9-2, and 9-3 are closed, and 100% may be in a fully opened state. Further, the opening degree of the pressure control valves 9-1, 9-2, and 9-3 is adjusted to the limit of 100%. Also, in one embodiment, the opening degrees of the pressure control valves 9-1, 9-2 and 9-3 are control signals for the pressure control valves 9-1, 9-2 and 9-3, To 20mA. Here, 4 mA is the state in which the pressure control valves 9-1, 9-2, and 9-3 are closed, and 20 mA is in the open state.

For example, when the opening degree is 50%, the opening degree is 12 mA, and the correction value may be a value obtained by multiplying the trim value by 12 mA. At this time, the trim value may be a value input from the driver 20. [ Different values may be applied to the trim values depending on the types of the fans 10-1, 10-2, and 10-3. Further, by applying various trim values, it is possible to control the extent to which the pressure control valves 9-1, 9-2, and 9-3 are excessively opened or closed. Thereby, the opening degree of the pressure control valves 9-1, 9-2, and 9-3 is adjusted to prevent a sudden increase in current that may occur during operation of the fans 10-1, 10-2, and 10-3 So that the fans 10-1, 10-2, and 10-3 can be protected.

For example, the current values 0A to 100A for the motors of the fans 10-1, 10-2, and 10-3 are controlled by the converters (not shown) through the pressure control valves 9-1, 9-2, 9-3), which is the same range as that of the control signal, and the deviation or the like can be calculated.

 The correction value calculator 124 calculates the trim value as a positive value when the deviation is negative and the negative value of the trim value when the deviation is positive. For example, when the deviation is -10, the trim value is applied at + 50%, and when the deviation is 10, the trim value is -50%. The fans 10-1, 10-2, and 10-3 having high load values are differently applied in accordance with the variation of the load values of the fans 10-1, 10-2, and 10-3, -3, and the load is increased with respect to the fans 10-1, 10-2, and 10-3 having low load values, and a plurality of fans 10-1, 10-2, and 10-3 Can be adjusted evenly.

Thus, the load value of each of the plurality of fans 10-1, 10-2, and 10-3 becomes equal to the average of the load values, and the load value of each of the plurality of fans 10-1, 10-2, It is possible to prevent an excessive current from flowing in one.

The pressure control unit 125 receives the pressure supplied to the combustion chamber 2 through each of the pressure transmitters 11 as described above. The pressure output values for the pressure control valves 9-1, 9-2, and 9-3 are calculated in consideration of the pressure set value input by the driver 20 and the pressure input through the pressure transmitter 11. The pressure output value may be a control signal for a conventional pressure control valve. The pressure output value can be an electrical signal the same as the control signal.

The control signal calculator 126 can calculate the control signal reflecting the correction value to the pressure output value received from the pressure controller 125. [ The control signal is a signal for controlling the opening degree of the pressure control valves 9-1, 9-2 and 9-3 and is a signal for outputting to the pressure control valves 9-1, 9-2 and 9-3 ). As a result, the pressure control valves 9-1, 9-2, and 9-3 are controlled by reflecting the load values of the fans 10-1, 10-2, and 10-3, , 10-2, 10-3 can be shut off when the motor is operated above the rated current. In addition, the cause of motor burnout is reduced. The control signal calculation unit 126 calculates the control signals for the pressure control valves 9-1, 9-2, and 9-3, and transmits the control signals to the output unit 130. [

The output unit 130 outputs control signals for the pressure control valves 9-1, 9-2, and 9-3 received from the control signal calculation unit 126 to corresponding pressure control valves 9-1, 9 -2, and 9-3, respectively. As a result, unlike the prior art, it is possible to control the set pressure target value by controlling the opening degree of each of the pressure control valves 9-1, 9-2 and 9-3, and the combustion of the hot air path, Stopping problems can be blocked. As described above, supplying air to the hot air path can be similarly applied.

FIG. 4 is a graph showing a current value of each fan with respect to time according to a conventional hot air path control process, FIG. 5 is a graph showing a current value in each fan with respect to time according to a hot air path control process according to an embodiment of the present invention, Is an opening graph. FIGS. 4 and 5 show the case where the first fan and the third fan are operating in three fans, and the pressure set value is 1250 mmAq.

Referring to FIG. 4, the third fan current value is 79.2 A and the first fan current value is 34.2 A at a predetermined time (Here, the current value of the fan means the current value of the fan motor, , The first fan means the fan 10-1 shown in Figs. 1 and 2, and the third fan means the first and fan 10-3 shown in Fig. 2). In addition, the pressure value of the pressure control valve can not be controlled by the pressure setting value such as decreasing to 1030 mmAq. As described above, it can be seen that the pressure control valve is controlled regardless of the difference in the current value of each fan in the conventional case. And the pressure of the air supplied to the combustion chamber is not properly controlled.

Referring to FIG. 5, in the case of the control apparatus according to an embodiment of the present invention, the first fan current value is 65.3 A and the third fan current value is 56.4 A, and the load value of each fan is uniform.

The opening degree of the pressure control valve connected to the first fan (the opening degree of the first fan in FIG. 5) is 57.7%, the opening degree of the pressure control valve connected to the third fan (opening degree of the third fan) is 79.8% So that they can be controlled differently. Also, the pressure value is maintained close to the pressure setting value of 1250 mmAq, so that the pressure control of the air supplied to the combustion chamber is performed properly.

As a result, it is possible to properly heat the furnace, to prevent the increase of the fuel cost of the blast furnace, and to operate the pulverized coal manufacturing facility utilizing the waste gas generated in the combustion.

6 is a flowchart of a control method according to an embodiment of the present invention. The load value can be received (S200) as described in the above-mentioned control apparatus. Then, the average of the load values can be calculated from the received load values, and the deviation of each fan can be calculated from the average of the load values. Then, the correction value can be calculated by multiplying the trim value by the opening degree of each pressure control valve (S210). The correction value can be determined depending on the deviation of each fan, and the tone / amount of the trim value can be determined.

The control signal may be output by reflecting the correction value to the pressure output value (S220). A control signal for each of the plurality of pressure control valves is transmitted to each pressure control valve (S230), and each pressure control valve can be controlled so that the load value of the fan becomes optimal.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

1: blast furnace
2: Combustion chamber
3: Regenerator
4: Chimney
5: Mixing room
6: Ventilator
7: gas supply section
8: inlet
9-1, 9-2, 9-3: Pressure control valve
10-1, 10-2, 10-3: Fan
11: Pressure transmitter
12: Shutoff valve
100: Control device
110:
120:
130:

Claims (8)

A control device for controlling an opening degree of a plurality of pressure control valves connected to a plurality of exhaust pipes for exhausting air to supply air to a hot air path,
A receiver connected to the plurality of exhaust pipes for receiving a load value of each of a plurality of fans for supplying the air;
A controller for calculating a plurality of correction values for equalizing the load values of each of the plurality of the received fans and outputting a control signal for controlling the opening degree of each of the plurality of pressure control valves reflecting the correction value; And
And an output section for transmitting the control signal to the plurality of pressure control valves,
Wherein,
Controlling the opening degrees of the plurality of fans to control the opening degrees of the plurality of fans to a set pressure target value, wherein a load value of each of the plurality of running fans is equal to an average of load values of the running fan To control the opening degree of each of the pressure control valves connected to the operating fan by reflecting the plurality of correction values individually,
Wherein the load value is a current value for the motors of the plurality of fans.
delete The method according to claim 1,
Wherein the correction value is a correction value,
And a tone value / a quantity of a trim value within a predetermined range from a deviation of a load value of each of the plurality of fans. The method of claim 3,
Wherein the control signal comprises:
And the pressure value is added to the correction value. The method of claim 3,
And the trim value is positive when the deviation of the load value is negative. The method of claim 3,
And the trim value is negative when the deviation of the load value is positive. Receiving a load value of each of a plurality of fans connected to a plurality of exhaust pipes to supply air;
Calculating a plurality of correction values for equalizing a load value of each of the plurality of received fans;
Outputting a control signal for controlling an opening degree of the plurality of pressure control valves reflecting the correction value; And
And transmitting the control signal to the plurality of pressure control valves,
Wherein the calculating step comprises:
Calculating the plurality of correction values individually so that a load value of each of the plurality of fans in operation is equal to an average of load values of the operating fan,
Wherein the outputting step comprises:
Controlling the opening of each pressure control valve connected to the operating fan to control the set pressure target value,
And the load value is the current value for the motors of the plurality of fans. 8. The method of claim 7,
Wherein said calculating step includes determining a tone / amount of a trim value in a predetermined range from a deviation of a load value of each of the plurality of fans.

Images