SU975806A1 - Device for automatically adjusting coke mass - Google Patents

Description

The invention relates to the black IU, tallurgy, in particular to the production of "pig iron in blast furnaces, more specifically to - devices for automatic loading of receivers or funnels, and can

be used for automatic correction of the mass of coke according to its humidity and dosing errors during skip and conveyor (non-conical) supply of materials to the blast furnace.

A device for correcting the mass of the material according to its humidity is known, which contains a remote coke moisture meter in each funnel, a coke mass remote meter in each funnel, multiplication units whose number corresponds to the number of funnels, and an adder, and the inputs of remote moisture meters AND coke mass meters each of the funnels is _{2 (the} inputs of the device, the setting unit of the basic humidity level, the units for comparing the basic and actual humidity of coke in the funnels by the number of funnels, the second sum2

magor, current averaging block, scaling block, coke mass setting unit with basic humidity. Yield setpoint basic humidity level is connected to one input of each comparator unit, with a secondary inlet which is connected You are a stroke of each moisture meter, each comparator output is connected with one ^- of the outputs of each multiplier, the second input of which is connected to the output of each mass meter coke, moreover, the outputs of all multiplication blocks are connected to the inputs of the second adder, the output of which is connected to the input of the current averaging block, and the output of the latter is connected to the input of the scaling block, the output of which is connected to in odom the first adder, the output of which is the output of the device. In turn, the output of the unit of mass of coke with the base humidity is associated with the second output of the first adder £ 1].

The device works as follows.

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From the signals on the actual moisture content of coke coming from the outputs of the moisture meters, respectively, to the inputs of the comparison units, the signal about the base humidity, subtracted from the output of the setting unit to the other inputs of the comparison units, is subtracted. The signals from the outputs of the comparison units, 'corresponding to changes in the coke moisture & ΜΛ 1),% in the funnels (where is the funnel number) in 10 -, - y feed, arrive respectively at the outputs of the multiplication units, to the other inputs of which the signals Сy (· "), Kg, respectively, from the outputs of the remote skip coke mass meters. In and multiplication units, the operations of multiplication D ^ '(- g),% by <5 ^ (1 *), kg and by a constant coefficient of 0.01 take place, as a result of which coke masses Δ are obtained. (^ · () By its humidity in each 20 considered funnel-ί th feed.

DSD) -ορ-ί ΔΥ ^ ϋ) 0 si) · _ '

Corrections for each funnel sum- ₂₅ ruthogs in the adder, and the result of HLVI) 'enters the current averaging block, from the output of which the signal goes to the input of the scaling block. In the scaling unit signalac | I ^? (4) is multiplied by a constant factor of 1/4, and the resulting signal is fed to the input of an adder, to another input of which a signal is received about a given coke mass with a base

moisture from the set point. Signal for the result -35

The summation curve from the output of the adder is sent to the coke mass sales system for each funnel.

The disadvantages of this device are 40

limited functionality due to the fact that the adjustment of the mass of coke can be calculated only by obtaining information on the mass of coke and its moisture in all (in the considered example, four) weight funnels ⁴⁵ . Therefore, the device can not be used ^{: to} use with unlimited loading of the trans. chi The low accuracy of the calculation of coke mass adjustments arises from the fact that in the absence of information on the mass and / or ⁵⁰ humidity of coke from one or several craters, the weight coefficient of the scaling unit does not change and is multiplied by a constant value of 4 ^f , In addition are not considered errors pre- ⁵⁵ zirovaniya coke mass.

The closest to the proposed technical entity is a device for automatic correction of coke mass, containing a remote meter coke classes in each funnel and a remote coke moisture meter, channel switch, first comparison unit, unit of basic moisture level, multiplication unit, nonlinear smoother, made in serially connected to the second unit of comparison, the amplifier with saturation, the first integrator, the output of which through: the first delay unit is connected to the second input second comparator, the adder, the dial with a base weight of the wet coke _gyo; the output of which is connected to the first block of the adder, to the second input of which the output of the first integrator is connected, the outputs of the remote moisture meters and coke mass meters are connected to the inputs of the channel switch, the output of which is connected to the first input of the multiplication unit and to the first input of the first comparator, the second input of which is connected with the output of the setpoint of the basic humidity level [2].

The device works as follows.

B. The moment when the required dose of coke is completed in one of the weight funnels, the output of the disgaggon coke moisture meter is connected with a channel switch to the first input of the reference unit, and the output of the remote coke mass meter to the input of the multiplication unit. From signals about coke moisture 4 $ · (ί) in the ^ -th weight funnel at -) -th moment of time in the comparator, the signal about the reference coke moisture is subtracted from the coke reference moisture setting unit. Signal of the difference obtained? ΔΥίΜΐ) goes to the multiplication unit, where it is multiplied by the coke mass in the -th funnel and by a constant coefficient of 0.01, which results in an adjustment of the coke mass Δ6 ·).

Coke mass adjustments for each funnel are fed to a nonlinear smoothing function, the function of which is described by the expression

Ιοίϋ. · 31 ep »

ΔφίΦ & Οίΐ-Όπ ρ> -ςνχνι [DO (.Ό-δΟΟμ ^ ή / ^

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γπθΔΟ (Ϊ), & 6 (ΐ-7) _ smoothed values of the adjustments to the current -ίth and previous (· "-!) -th times, '5

AC, β-coefficients are selected based on the static properties of the useful signal and interference, as well as the characteristics of the blast furnace.

From the output of the nonlinear smoother signal. is fed to the input of the adder; where it is summed with the signal coming from the coke mass adjuster at the base humidity. The signal of the summation result is sent to the coke mass sales system for each funnel.

A disadvantage of the known device lies in the low accuracy of the calculated adjustments due to heme, which does not take into account the errors in dosing the mass of coke and the effects of uncontrolled disturbances, as a result of which the actual mass of the coke is not maintained at the reference humidity corresponding to the specified coke mass at intervals time of the selected length.

The aim of the invention is to improve the accuracy of the adjustments of the mass of coke.

This goal is achieved by hem that in a device for automatic correction of coke mass, containing a remote coke mass meter in each funnel 'and a remote coke moisture meter, channel switch, first comparison unit, unit of basic humidity level, multiplication unit, nonlinear smoothing, formed as a series soedinen- ⁴⁰ GOVERNMENTAL second comparator unit, the amplifier with saturation of the first ingerragora whose output via a first delay section connected to the second input of the second comparison unit Ia, the adder, the dial ^{4 May} mass of coke to the base humidity, whose output is connected to a first adder unit, to the second input of which is connected to the output of the first integrator, the outputs of remote moisture meters 50 and the mass of coke are connected to the channel selector inputs, whose output Cpd ¹ nen with with the first input of the multiplication unit and with the first input of the first unit with 55 55

neniya, the second input of which is connected to ^; output of the setpoint of the base level of humidity, the first source of signal of a constant value was additionally introduced

the third comparison unit, the fourth comparison unit, the second delay unit, the fifth comparison unit / control channel model without a lag in the form of a sixth comparison unit connected in series and a second integrator, the output of which is connected through the third delay unit to the second input of the sixth comparison unit, a scaling unit, the second the source of a signal of constant magnitude, the output of which is connected to the second input of the scaling unit, the first input of the latter is connected to the output, the second integrator, and the output to the thirds, the input is the sum the torus, the output of which is connected through the first delay unit to the second input of the fourth block compared to the second input of the fifth comparator unit, the first input of which is connected to the output of the channel switch, and the output to the first input of the sixth comparator unit, the first input of the fourth comparison unit is connected to the output of the multiplication unit, and the output with the first input of the second comparison unit, the output of the second signal source of constant magnitude is connected to the second input of the third comparison unit, the first input of which is connected to the output of the first block with avneniya - a second input of the multiplication unit.

The drawing shows one of the variants of the proposed device (□ signal about the end of the coke dose set).

The device for automatic correction of coke mass contains remote meters 1 and 2 of coke moisture by weight funnels, dksgantsionye 3 and 4 meters of coke mass by weight funnels, switch 5 channels, unit 6 of the basic level of coke moisture, first unit 7 of comparison, ‘first source. 8 signals of constant magnitude, second comparing unit 9, multiplication unit 10, fourth comparing unit 11, first delay unit 12, third comparing unit 13, nonlinear smoothing 14, fifth comparing unit 15, control channel model 16 without delay, sixth comparing unit 17, the third block 18 of the delay, the second block 19 of the delay, the amplifier 20 with saturation, the second integrator 21, the first integrator 22, the scaling unit 23, the second source 24 of a constant signal, the unit 25 of the coke mass with the base humidity of the funnels and the adder 26,

The presented scheme of the device is designed to work with two weight

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funnels, however, the principle of constructing the scheme is acceptable for any number of weight funnels.

The device works as follows. §

At the moment of delivery of the required dose of coke in one of the weight funnels, the output of the remote coke moisture meter, for example, 1, is connected via switch 5 to the channel. *

the first input of the first block 7 comparison, and the output of the remote meter 3 coke mass to the first input of the block 10 multiplication. A 5-channel switch operates from a signal 3 about the end of a set of a dose of coke in a funnel, for example, about opening the valve of the weighing hopper. Thus, signals about the moisture and mass of coke from one or another funnel are received for further processing in the system.

From the signal about coke moisture ^ (ΐ) in the ^ -th weight funnel at ή -th time in the first comparison unit 7, the signal about the basic humidity of coke \ Y (ί) ²⁵ arriving at the second input of the first comparison unit 7 from the output unit 6 is subtracted base coke moisture. Signal received in block 7

^ (4) - Μ _ό (4) ~ \ // * ω

fed to the first input of the second unit 9 comparison and subtracted therein from the signal of constant value "1", coming from the output of the first source 8 'of the signal of constant value. From block 9 comparison, the signal is fed to the second input of block 10 multiplication, the first input of which is a signal about the actual mass of wet κοκοβθ ^ (ΐ). At the output of multiplication unit 10, a signal is obtained about the cosed mass of coke at its base humidity, that is, 6 ^. (four)

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Next, using the first block 12 of the delay and the third block 13 of the comparison is determined by the deviation of the shape of the ideal mass of coke ^ ™ (ι) from the task of the technologist to the mass of coke at its base moisture. Estimates of the ideal mass of coke, g. such a setpoint on its mass, at which the coke mass dose at its base humidity equals the coke mass specified by the technologist,

Ό6 8

with a lag of one cycle in a simplified expression.

where (3 * (4) is the actual setpoint for the mass of coke produced in the past 4th dosing cycle;

0 ^ ((4) - the technologist's task for the mass of coke at its base humidity.

From the evaluation of the ideal mass of coke

Γ (ΐ) is subtracted in order to eliminate the effect of changes in Sc ^ (4) for a more accurate subsequent calculation, namely, extrapolation of the corrections of the coke mass. Subtracting from

ΐ) we get

D5 ^ 14) (d

47 * U)] -) ·

This means that, C, * (4) can be done without a preliminary assessment of O * ¹ ”and heme is the most simplified device.

The signal οαΟ ^ (Ϊ) is formed in the third comparison unit 13, the first input of which receives the signal Сΐ) from the output of the multiplication unit, and the second input the signal (4) from the output of the first block 12 delay.

The received signal (4) from the output of the third unit 13 of the comparison is fed to the input of the exgraplora implemented on the basis of the nonlinear smoothing cutter 14.

When a mass of coke is accumulated in another funnel, a signal on the correction of its mass is also sent to the smoother 14, i.e. a temporal sequence composed of D5 ^ is fed to the smoothing 14 at different weight funnels as _{ί of} their filling with coke.

Exgravator on the basis of nonlinear smoother 14 works as follows,

From the signal DC, (4) in the fifth block 15 of the comparison is subtracted smoothed signal to ^ y-!), Delayed by one cycle in the second block 19 of the delay. The resulting difference

C? (4) -DO, (4) -Dc! (4-1) ^!

from the output of the fifth unit 15 comparison is fed to the input of the amplifier 20 with satn

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by functioning, which is carried out according to the formula

% ΐ) ', + P> cGS |') 7p>

- (b bore- 0 * 0 ') <-r

ten

gpesGa ^ -)) - output signal of the amplifier 20 "

From the output of the amplifier 20 with saturation, the signal arrives at the input of the first integragor 22, where it is algebraically summed! ¹ handles the signal received at the preceding calculation cycle. With the output> ~ yes of the first integrator 22, the signal is fed to the input of the delay block 19 for memorizing for one clock cycle. Smoothed whitefish. From the output of the first integrator 22, the signal 1 * 1) is taken as an extrapolated signal for one clock, which is given to the first input of the adder 26. The very <>& take into account the explicit effects of all ^ uncontrolled disturbances, for example, -. ”(changes in the particle size distribution: coke.

thirty

Due to the presence of errors in the dosing of coke coke miners that affect the thermal conditions of the blast furnace, a corresponding adjustment of the coke mass is necessary. To do this, on Thursday comparison unit 11, the signal on the actual coke mass 6) (ι) coming from the output of the 5 channel switch is subtracted from the signal 0} ^ (<1) coming from the output of the first delay block 12. The received difference signal is sent to the _40th input of the model 16 of the control channel without a “lag represented by inertia _(a first-order link in a recurrent-difference form. In the sixth comparison model block 17, the control channel model · subtracts the siphnal from the fourth comparison block 11) from the output of the second integrator 21, delayed by one clock cycle in the second delay block 18. The signal of the raznivannoy difference is fed to the input of the second integrator 21. Thus, the operation of the control channel model is described a- by the expression

$ 5

Mo ⁿ (1 + 1) = D0, ^and .

where οί ц is a constant coefficient chosen depending on the properties of the blast furnace control channel "change in coke consumption, change in silicon content in cast iron".

At the output of the control channel model 16 (the output of the second integrator 21), a signal is received about the predicted deviations of the output variable of the domain process under the influence of D (d (ΐ), which is fed to the input of the scaling unit 23, where it is multiplied by a constant coefficient K, the signal of which comes from output of the second source 24 signal of a constant value. The value of the coefficient K is selected according to the recommendations for setting up the P-controllers.

The signal from the output of the scaling unit 23 goes to the input of the adder 26, to the third input of which a signal ο0 ^ (ΐ + 1) is fed from the coke mass adjuster 25 with the base humidity to each weight funnel. At the output of the adder, a signal is obtained on the calculated mass of coke; β * (ΐ * 1) for the upcoming 4 + 1 dosing cycle.

β ^ (ΐ + 0 -Ογ ^ (. ι + Ό * Δ · * (.ί + Ό + Δθ * ι (ιη)

This signal is fed to the input of the first block 12 of the delay and in the system of realization of the mass of coke for each funnel (not shown).

Technical and economic advantage of the proposed device is that it contributes to the stabilization of thermal ¹ mode blast furnace smelting. The expected economic effect from the introduction of the device will be about 24,800 rubles. per oven per year.

Claims (1)

Claim Device for automatic correction of coke mass, containing a remote coke mass meter in each funnel and a remote coke moisture meter ,, Channel switch, first comparison unit, unit for basic humidity level, multiplication unit, nonlinear smoothing, made in the form of serially connected second comparator unit, amplifier with saturation, the first integrator, the output of which through the first delay unit is connected to the second input of the second comparator unit, an adder, a coke mass setting unit with no 12 11,975; humidity, the output of which is connected to the first block of the adder, to the second input of which the output of the first integrator is connected, the outputs of the remote moisture meters and the mass of coke are connected to the inputs of the channel switch, the output of which is connected to the first input of the multiplication unit and the first input of the first block comparison, the second input of which is connected to the output of the unit of the base level of humidity, characterized in that, in order to improve the accuracy of the adjustments of the coke mass, the device additionally contains the first source signal a constant magnitude ^{of 15} us, the third comparing unit, the fourth comparison unit, a second delay unit, a fifth comparison unit, model channel without delay regulation in a series-connected sixth comparator and a second integrator whose output is connected via a third delay unit to a second input of the sixth the comparison unit, the scaling unit, the second source of the signal of constant magnitude, the output of which is connected to cc? the second input of the scaling unit, the first input of the latter is connected to the output of the second integrator, and the output is connected to the third input of the adder, the output of which is connected through the first delay unit to the second input of the fourth comparison unit and the second input of the fifth comparison unit, the first input of which is connected to the output of the channel switch and the output to the first input of the sixth comparison unit, the first input of the fourth comparison unit is connected to the output of the multiplication unit, and the output to the first input of the second comparison unit, the output of the second source signal and a constant value is connected to the second input of the third comparison unit / the first input of which is connected to the output of the first comparison unit, and the output to the second input of the multiplication unit, ,