The control system of the melt level in the furnace blast furnace

 

(57) Abstract:

The invention relates to metallurgy, in particular to a device control parameters for blast-furnace production, and can be used to regulate thermal state of the blast furnace. The inventive control system includes a sensor voltage drop on the casing of the furnace, Converter, device quantization signal, the unit fixing the beginning and the end product of melting, the device calculating the moving average value, the correction device, the first block scaling, the input block of the initial conditions, the registering unit, the control unit, the second unit scaling, which is the selection of the informative signal component of the measured voltage drop of the electric current on the casing due to changes in the heating furnace. 1 Il.

The invention relates to ferrous metallurgy, in particular to a device control parameters for blast-furnace production, and can be used to regulate thermal state of the blast furnace.

As the prototype is set to a known control system level of the melt around the circumference of the hearth of the blast furnace [1] sod the CTB correction, block input initial conditions, the control unit and the evaluation unit with power scaling.

This system does not provide for correction of the resulting signal from the monotonous part, dependent on the current heating furnace as in the accumulation period, and the period of production of products of fusion.

Closest to the proposed invention to the technical essence and the achieved result is the system level control of the melt in the furnace blast furnace (application N 4937041/02 (042311) from 20.05.91 1st option).

However, the use of this system only to commit the changes in the number of liquid phases in the furnace blast furnace leads to loss of information about the heat the blast furnace, which reduces the efficiency of conducting the blast smelting.

The aim of the invention is the reduction of coke consumption and increase furnace productivity through operational control of thermal state of the blast furnace.

This is achieved by the control system of the melt level in the furnace the blast furnace contains a sensor voltage drop on the casing of the furnace, Converter, device calculating the moving average value, the evaluation unit with the first unit wt the od which is connected to the first input of the control unit, and the second and third outputs from the first and the second input of the correction and quantization signal, the first input connected to the inverter output, the input connected to the sensor voltage drop, the inverter output is connected to the third input of the correction device, a fourth input connected to the output device calculating the moving average value, and the first output to the first input of the first block scaling, second and third inputs connected to first and second outputs of the input block of the initial conditions, the fourth input of the first scaler is connected to the first output control unit, and the fifth and sixth inputs respectively to the fourth and first output unit fixing the beginning and the end product of melting, the fifth output of which is connected to the second input of the quantization signal, the first and second outputs of which are connected respectively with the first and second inputs of the unit fixing the beginning and the end product of melting, a third input connected to the third output block input initial conditions, the fourth output of which is connected to the second input of the control unit, the first output of which is connected with the third input ostrorog an input connected to the second output control unit, a third input connected to the second output unit fixing the beginning and the end product of melting, the third input device calculating the moving average value is connected with the third output of the quantization signal. The system is further provided with a second scaler connected to a recording device, the first input of the second scaler is connected to the second output of the correction device, and the second, third, and sixth inputs are connected respectively with the sixth, fifth and seventh outputs of block I of the initial conditions and the fourth input with the first output of the control unit.

The drawing shows a block diagram of a control system of the melt level in the furnace the blast furnace.

The control system includes a sensor 1 voltage drop on the shell of the blast furnace, connected to the input of the Converter 2, the output of which is connected to the first input device 3 quantization signal and to the third input of the correction device 6. The first, second and third outputs of the device 3 from the input signal are connected respectively with the first, the second input unit 4, the fixing of the beginning and the end product of melting and the third input device 5 calculating the moving media is uhodi the correction device 6 connected respectively to the first inputs of the first 7 and second 11 blocks scaling the outputs are connected to inputs of a recording device 9. The first, second, third and fourth outputs of the block 8 input initial conditions connected respectively to the second, the third inputs of the first block 7 scale, to the third input of the unit 4 fixing the beginning and the end product of melting and to the second input of the control block 10, and the fifth, sixth and seventh outputs of the block 8 to the third, second, and sixth inputs of the second unit 11 scaling. First, second, third, fourth and fifth outputs of block 4 of fixing the beginning and the end product of melting are connected respectively to the first input unit 10 controls and the sixth input of the first unit 7 scale, with the first input of the correction device 6 and the third input of the control block 10, with the second input of the correction device 6, with the fifth input of the first unit 7 scale and with a second input device 3 quantization of the signal. The first output of the control block 10 is connected to the third input of the 3 quantization signal to the first input device 5 calculating the moving average value and the fourth inputs, respectively, of the first 7 and second 11 blocks scaling, and the second output unit 10 to the second input device 5 calculation scalawag the furnace blast furnace further comprises to enter information about the contents of the sample on the silicon unit on the base, for example, referencing a digital type PP-10-IU, the output of which is connected to the sixth output unit 8, to commit the moment you enter the content of the sample on the silicon, and time of sampling on the silicon content in the products of melting two control buttons, for example, the type of switch N-2K-00000 connection control signal respectively to the fifth and seventh outputs of the block 8.

As a recording device 9 can be used, for example, analog device, indicating and recording (point-to-point) type A, which is designed to display the monitored parameters of the proposed system on a chart paper and scales of unit 9.

The control system (Fig. 1) works as follows.

On the command "Start", performed on the corresponding button of the control unit 8 input initial conditions and input through the fourth output unit 8 to the second input unit 10 management, at its first output generated clock pulses. These pulses correspond to the positives of the boot device at the time of the next filing of a portion of the charge in the furnace, such as dropping a large cone charging apparatus, and are formed in the block 10 as a result of arrival at its input signal the output unit 10 of the control of clock pulses to synchronize the operation of the control system in General, including the operation of the device 3 quantization of the signal device 5 calculating the moving average value, the first 7 and second 11 blocks scaling.

So, with each receipt of clock pulses to the third input of the 3 quantization of the signal of the latter reads the new value of Nvin the code supplied with the output of the inverter 2 to the first input device 3.

In the device 3 number code Nvdivided into current Nvkvalue and the previous Nvk-1the informative value of the signal, which are respectively with the first and second outputs of the device 3 receives the first and second inputs of block 4 of fixing the beginning and the end product of melting, and calculates the magnitude of their difference

Nv=Nvk-Nvk-1B (1)

In block 4 under the condition of Nvk>Nvk-1on his fifth outputs the control signal through the second input affects the device 3, providing the latest calculation of the absolute value |Nv| difference between the current Nvkand the previous Nvk-1the values of the informative signal

N NKv-N,B (2)

Thus, with the advent of the t the t the period of accumulation of the products of melting the value of Nvby the formula (I) and at the time of issue size |Nv| by the formula (2).

With each arrival of the clock pulse from the first output unit 10 controls the third input device 3 and to the first input device 5 calculating the moving average value on the second output device 3 are formed of pieces of information that are calculated by the formulas (1) and (2), which are received through the third entrance in the shift registers of the device 5 and stored there until, while on the second input device 5 will not receive new information about a given block 10 to the value of the number of cycles of operation of the boot device of the furnace.

On the command "Closing the tap hole block 4 on the second output produces a short pulse, which translates the block 10 through its third input to the initial position, and after the "Opening of the tap hole block 4 on the first output generates a short pulse which is fed to the first input unit 10, providing the appearance information at its second output on a given value of n the number of cycles of operation of the boot device blast furnace.

In the future, with the advent of information about a given value of n the number of cycles of operation of the boot device of the furnace to a second input device 5 zapuskaete registers device 5, through his multiplexer receives in the scheme of computing device 5 calculate the average of values

Ncvp1/nNKv-N,B (3)

Thus, each actuation of the boot device of the furnace on the output device 5 in accordance with the formula (3) is formed information Nvcpas a end result of the allocation process component informative signal due to technological factor of the heating furnace.

To eliminate the accumulation of errors in the measurement of informative signal, it is necessary to perform the correction of the resulting signal appearing at the output 5 of the control system. To do this, when closing the tap hole of the furnace unit 4 to its second output effect through the first input of the correction device 6. Concurrently, the third output unit 4 displays information about the value of Nvminthe minimum amplitude of inflection of the curve of change of informative signal, the number in the code which is supplied to the second input device 6. Output device 5 to the fourth input device 6 also receives the value of Nvcpthe calculated average values according to the formula (3).

With printplace information about the size (Nvcp)3in closing the tap hole

N= 1/nNKv-N,B (4) and performs the correction process according to the formula

NKvII= Nmvin+1/nNKv-N-1/nNKv-N,B (5)

In subsequent periods, the accumulation and release of product melting at constant values of Nvminand (Nvcp)3the number in the code NvkIIsupplied with the second output device 6 to the first input of the second unit 11 scaling to update values of Nvminand(Nvcp)3subsequent closing of the tap hole of the blast furnace. Taking into account the update of these values, the device 6 will continue to perform the correction of the output of the device 5 in the new conditions of the blast furnace and control system.

In the second block 11 is in the process of scaling the current adjusted NvkIIin the code (formula 5).

On the front panel of the unit 8 input initial conditions using the buttons set the time of sampling on the silicon content in the pig iron during product melting furnace blast furnace, and with the help of the generator and associated control buttons set the t input of this content on the knob.

Information in accordance with this comes from the seventh, sixth and fifth outputs of block 8 on the sixth, second and third inputs of the second unit 11 scaling.

When the control signal characterizing the sample on the silicon content in the pig iron, the sixth input of the second unit 11 scaling in the last will fix the value of NmIIaccording to the information received at the first input unit 11

NImINmin+1/nNKv-N-1/nNKv-N,B (6)

On the command "input of the content of the sample on the silicon in the pig iron through the third input unit 11 starts its circuit calculate the scaling factor

NmKII= / B (7)

The value of NkmIIcalculated according to the formula (7), permanently stored in the internal register block 11 to the subsequent input of the content of silicon in the pig iron and receipt of the appropriate command to the third input of the block 11.

At the next occurrence of the clock pulse from the first output unit 10 controls the fourth input unit 11 in the last operation will be carried out according to the formula

Si=NkmIINvkII, (8)

Thus, in the second block 11 scaling formiruemoe the silicon content in the pig iron, accumulated in a given time in the metal reservoir hearth furnace.

After conversion result obtained by the formula (8), of the digital code to an analog signal last received at the input point of the recording device 9, where one of the channels on the scale and on the diagram paper is the trend of the predicted content of silicon in the pig iron. Concurrently, the other measuring channel is displayed change the number of products melting in a given time in the metal reservoir hearth of the blast furnace. The last information was formed as a result of processing informational signal from the output of the inverter 2 to the third input of the correction device 6. This adjusted signal comes from the first output device 6 to the first input of the first unit 7 scale. After the scaling process unit 7 information about changing the number of products melt is fed from the output of the unit 7 to the input of a recording device 9.

The proposed control system allows to predict the silicon content in the pig iron, which contributes to operational assessment of trends furnace to changes in heat.

Vnedreniaya of chemical products smelting and reducing the variations in the heating furnace, to reduce coke consumption by 1.5.2.0 kg/t of pig iron and increase furnace productivity by 0.4.0,6%

The CONTROL SYSTEM of the MELT LEVEL IN the FURNACE is a BLAST FURNACE, comprising a sensor voltage drop on the casing of the furnace, the evaluation unit with the first unit scaling, the input block of the initial conditions, the unit fixing the beginning and the end product of melting, the first output of which is connected to the first input of the control unit, and the second and third outputs from the first and second inputs of the correction device, characterized in that it is provided with the inverter, the device calculating the moving average values, the second block scaling, quantization signal, the first input connected to the output of the Converter, input of the latter is connected to the sensor, the voltage drop across the furnace shell, the inverter output is connected to the third input of the correction device, a fourth input connected to the output device calculating the moving average value, and the first output to the first input of the first block scaling, second and third inputs of which are connected with the first and second outputs of the input block of the initial conditions, the fourth input of the first block mashtabirovanie unit fixing the beginning and the end product of melting, the fifth output of which is connected to the second input of the quantization signal, the first and second outputs of which are connected respectively with the first and second inputs of the unit fixing the beginning and the end product of melting, a third input connected to the third output block input initial conditions, the fourth output of which is connected to the second input of the control unit, the first output of which is connected to the third input of the quantization signal and the first input device calculating the moving average value, a second input connected to a second output control unit, a third input connected to the second output unit fixing the beginning and the end product of melting, the third input device calculating the moving average value is connected with the third output of the quantization signal, the second scaler is connected to a recording device, the first input of the second scaler is connected to the second output of the correction device, and the second, third, and sixth inputs, respectively, with the sixth, fifth and seventh outputs of block I of the initial conditions and the fourth input with the first output of the control unit.

 

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