CN102344977B - Blast furnace under-groove coke weighing control system without dispersing hopper - Google Patents

Abstract

The invention discloses a blast furnace under-groove coke weighing control system without a dispersing hopper. The system comprises a control module and a centralized weighing hopper, wherein the control module successively controls a feeding machine, a vibrating screen and a coke belt to stop so that a material stored in a storage tank is fed to the centralized weighing hopper; and the centralized weighing hopper discharges the material according to the material under the control of the control module. In the blast furnace under-groove coke weighing control system without the dispersing hopper, a double-lead system is constructed according to an actual coke weighing curve without the dispersing hopper, thus the accuracy of weighing is ensured and a large amount of materials are not accumulated on the feeding equipment and the feed belt so as to prolong the service life of the equipment; and a self-correct system is constructed for factors influencing the accuracy of weighing, such as weighing back value, the lead and the like, thereby maximally ensuring the accuracies of single weighing and total feeding mass.

Description

There is not coke Weighting and Controlling System under the blast furnace groove that disperses bucket

Technical field

The present invention relates to blast furnace groove discharge control techniques field, particularly a kind of do not have a coke Weighting and Controlling System under the blast furnace groove that disperses bucket.

Background technology

In recent years, for saving the area and reducing investment outlay, the blast-furnace coke supply cancellation occurred and has disperseed weighing, only keeps the mode of concentrating weighing.Under new mode, the weighing tracing pattern of coke has had bigger change, causes original Weighting and Controlling System not exclusively suitable.

Fig. 1 shows the existing coke performance diagram of weighing when disperseing weighing, for guaranteeing to concentrate the accuracy of weight of coke in the scale hooper, legacy system generally adopts the way of setting " full lead " to improve weighing precision, namely when being about to reach target value, weighing stops feeding machine in advance, finish the weighing of residual mass by the inertia remained shock of equipment, but under the novel process that concentrated weighing is only arranged, this way is inapplicable.

Summary of the invention

One of purpose of the present invention provides a kind of weighing precision that both guaranteed, makes the nothing of not piling up a large amount of materials on feeding device and the feed belt disperse coke Weighting and Controlling System under the blast furnace groove of bucket again.

According to an aspect of the present invention, provide a kind of and do not have that the coke Weighting and Controlling System comprises under the blast furnace groove that disperses bucket: control module and concentrate scale hooper;

Control module, concentrated scale hooper, storagetank, feeding machine and vibratory screening apparatus;

Described control module is controlled described feeding machine, vibratory screening apparatus and burnt belt successively and is stopped, thereby with the described concentrated scale hooper of material dispensing of storagetank storage;

Concentrate scale hooper, under the control of described control module, carry out discharge according to described batching.

Concentrate scale hooper, under the control of described control module, carry out discharge according to described batching.

Further, described control module comprises first determining unit, determines the weighing target value $W_{t\arg \_n}=\frac{W_{\mathrm{set}\_n}}{1-\mathrm{\α}}+E_{\mathrm{com}}+W_{\mathrm{cdz}\_n};$ Wherein,

$E_{\mathrm{sum}}=\underset{k=1}{\overset{n-1}{\mathrm{\Σ}}}{E}_k;$ E _k＝W _k-W _{set_k}(k＝1,2,…,n)；

In the formula, described W _{Set_n}Be the n time set(ting)value; α is moisture content; E _ComBe to answer compensating error the n time; W _{Cdz_n}Be the n time title floors; E _MaxBe the single error compensation upper limit; E _SumBe progressive error; E _kBe the n time error;

Second determining unit according to described weighing target value, determines to stop the lead W of described burnt belt _{Adv2_n}, determine to stop the lead W of described feeding machine and described vibratory screening apparatus _{Adv1_n}

Wherein, W _{Adv 2_n+1}'=W _{Adv 2_n}+ kE _{Adv_n},

E wherein _{Adv_n}=W _{Lm_n}-W _{Targ_n},

In the formula, described W _{Adv2_n+1}' be from revised the n+1 time lead; Described W _{Adv2_n+1}Be the n+1 time lead behind the amplitude limit; Described k is the lead modified gain; Described A _MaxFor stopping the belt lead upper limit; Described W _{Adv2_n+1}Be the n+1 time lead; Described E _{Adv_n}Be that the n time weighing material completely is worth poor with target value, namely stop the error of belt lead, described W _{Lmn_n}Be that the n time weighing material completely is worth;

$(t_{\mathrm{glys}}+k_{\mathrm{pd}}\&CenterDot;t_{\mathrm{pdys}}){\mathrm{\&omega;}}_{\mathrm{gj}}<W_{\mathrm{advl}\_n}<\frac{l_{\mathrm{gj}}}{v_{\mathrm{gj}}}{\mathrm{\&omega;}}_{\mathrm{gj}},$ W _{Adv1_n}W _{Adv2_n}, in the formula, described t _GlysBe the time-delay between feeding machine and the vibratory screening apparatus; k _PdThe conversion factor of inertia operation when shutting down for belt; t _PdysInertia working time when shutting down for belt; ω _GjFor supplying burnt belt to the speed of concentrating the scale hooper feed; l _GjBe the effective fed distance for burnt belt; v _GjBe the belt travelling speed.

Further, described Controlling System also comprises correcting module, and behind each concentrated scale hooper discharge, symmetrical floors is revised, i.e. W ' _{Cdz_n+1}=k ₁W _{Lk_n}+ k ₂(W _{Lk_n}-W _{Lk_n-1}),

In the formula, described W ' _{Cdz_n+1}For claiming floors from revised the n+1 time; W _{Cdz_n+1}Be the n+1 time behind amplitude limit title floors; k ₁Be this gain; k ₂Be the trend gain; C _MaxFor claiming the floors upper limit; W _{Lk_n}It is residual value after the n time blowing finished; W _{Lk_n-1}It is residual value after the n-1 time blowing finished.

Further, described control module realizes by DSP, ARM, FPGA or PLC.

Further, frequency transformer, described frequency transformer are connected described control module and supply between the burnt belt.

Further, described concentrated scale hooper all disposes limit switch and weight sensor; Described weight sensor is connected with described frequency transformer.

Coke Weighting and Controlling System under the blast furnace groove that disperses to struggle against according to nothing provided by the invention, actual coke weighing curve when disperseing bucket according to nothing makes up " two lead " system, both guaranteed weighing precision, make again and do not pile up a large amount of materials on feeding device and the feed belt, prolonged the work-ing life of equipment; The factor that influences weighing precision has been made up from update the system as claiming floors, lead etc., guaranteed the accuracy of single weighing and feed total mass to greatest extent.

Description of drawings

Fig. 1 has coke weighing curve synoptic diagram when disperseing weighing now;

Fig. 2 is that the nothing that provides of the embodiment of the invention is disperseed coke Weighting and Controlling System structural representation under the blast furnace groove of bucket;

Fig. 3 is the structured flowchart of control module shown in Figure 2;

Fig. 4 is the nothing that provides of embodiment of the invention coke weighing curve synoptic diagram when disperseing weighing;

The object of the invention, function and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.

Embodiment

As shown in Figure 2, coke Weighting and Controlling System under the blast furnace groove that the nothing that the embodiment of the invention provides disperses to struggle against, it comprises control module, frequency transformer, storagetank, concentrates scale hooper, velocity sensor, feeding machine and vibratory screening apparatus.Control module is used for controlling described feeding machine, vibratory screening apparatus and burnt belt successively and stops, thereby with the described concentrated scale hooper of material dispensing of storagetank storage.Control module can realize with DSP, ARM, FPGA or PLC.Concentrated scale hooper all disposes limit switch and weight sensor.Wherein, limit switch comprises and reaches the position and close two places that put in place, by common cable Access Control module.Can identify and to reach position, indefinite position (neither reach position also do not put in place in the pass), close signal such as put in place by this limit switch.Weight sensor will be concentrated scale hooper weight to be converted to electrical signal and send into corresponding weight transmitter, and insert control module by the Profiibus-DP bus.Can accurately obtain to concentrate the gravimetric value of scale hooper by weight sensor, thus identification discharging sky, signal that material is full.When the coke supply amount is big, can adopt control module control frequency transformer, can make the start-up course of belt more level and smooth on the one hand, stopped process is rapider, can regulate the coke supply ability by adjusting for the running speed of burnt belt on the other hand.Velocity sensor obtains the travelling speed for burnt belt, when frequency transformer is arranged, can directly insert in the frequency transformer, velocity information can be sent into control module on the one hand, also can constitute closed loop speed control system with frequency transformer on the other hand.

The embodiment of the invention provides does not have coke Weighting and Controlling System under the blast furnace groove that disperses bucket, is " two lead " system that the actual coke weighing curve (seeing Fig. 4 for details) when disperseing bucket according to nothing makes up.Wherein, " two lead " specifically can realize by control module.Referring to Fig. 3, control module comprises first determining unit 10 and second determining unit 20.

Below in conjunction with Fig. 4 above-mentioned control module is introduced.Wherein, as shown in Figure 4, the starting point of the n time batching is to concentrate residual value W in the scale hooper behind blowing last time _{Lk_n-1}, after weighing begins, start for burnt belt, then vibratory screening apparatus and feeding machine delayed startup.Owing to for original material on the burnt belt and the new batching of feeding device certain intervals is arranged, therefore causes the weighing curve to be the ladder form.Because there is running inertia for burnt belt, so need to reach W in weighing _{Targ_n}Shut down, this lead is designated as W before _{Adv2_n}Stop because vibratory screening apparatus needs to stop the back time-delay at feeding machine, and there is the inertia remained shock in vibratory screening apparatus, therefore for prevent that for windrow so that damage equipment on the burnt belt, feeding machine and vibratory screening apparatus need stop before the belt shutdown, this lead is designated as W _{Adv1_n}This blowing finishes the back and produces new residual value W _{Lk_n}

First determining unit 10 is used for determining the weighing target value $W_{t\arg \_n}=\frac{W_{\mathrm{set}\_n}}{1-\mathrm{\&alpha;}}+E_{\mathrm{com}}+W_{\mathrm{cdz}\_n}---\left(1\right);$ Wherein,

$E_{\mathrm{sum}}=\underset{k=1}{\overset{n-1}{\mathrm{\&Sigma;}}}{E}_k;$ E _k=W _k-W _{set_k}(k=1,2,…,n)；

In the formula, described W _{Set_n}Be the n time set(ting)value; α is moisture content; E _ComBe to answer compensating error the n time; W _{Cdz_n}Be the n time title floors; E _MaxBe the single error compensation upper limit; E _SumBe progressive error; E _kBe the n time error.As can be seen, the weighing target value has been taken all factors into consideration the influence of moisture, sum of errors residual value from the formula (1).

Second determining unit 20 is used for according to described weighing target value, determines to stop the lead W of described burnt belt _{Adv2_n}, determine to stop the lead W of described feeding machine and described vibratory screening apparatus _{Adv1_n}

Wherein, W _{Adv_2n+1}'=W _{Adv2_n}+ kE _{Adv_n}

Wherein, E _{Adv_n}=W _{Lm_n}-W _{Targ_n},

In the formula, described W _{Adv2_n+1}' be from revised the n+1 time lead; Described W _{Adv2_n+1}Be the n+1 time lead behind the amplitude limit; Described k is the lead modified gain; Described A _MaxFor stopping the belt lead upper limit; Described W _{Adv2_n+1}Be the n+1 time lead; Described E _{Adv_n}Be that the n time weighing material completely is worth poor with target value, namely stop the error of belt lead, described W _{Lm_n}Be that the n time weighing material completely is worth;

Stop the lead W of feeding machine _{Adv1_n}Determine comparatively complicated, can not be too little, can not be too big.This is because stop vibratory screening apparatus for protection equipment requirements feeding machine stops the back time-delay, just allows to stop belt after vibratory screening apparatus stops, and therefore then may cause vibratory screening apparatus not stop as yet and coke weighing superorder scale value if this value is too little; If it is too big then might cause the residue material amount on the belt can't reach the weighing target value.For this reason, W _{Adv1_n}Should satisfy: $(t_{\mathrm{glys}}+k_{\mathrm{pd}}\&CenterDot;t_{\mathrm{pdys}}){\mathrm{\&omega;}}_{\mathrm{gj}}<W_{\mathrm{advl}\_n}<\frac{l_{\mathrm{gj}}}{v_{\mathrm{gj}}}{\mathrm{\&omega;}}_{\mathrm{gj}},$ W _{Adv1_n}W _{Adv2_n}, in the formula, described t _GlysBe the time-delay between feeding machine and the vibratory screening apparatus; k _PdThe conversion factor of inertia operation when shutting down for belt; t _PdysInertia working time when shutting down for belt; ω _GjFor supplying burnt belt to the speed of concentrating the scale hooper feed; l _GjBe the effective fed distance for burnt belt; v _GjBe the belt travelling speed.

Owing to be subjected to concentrate the influence of the scale hooper liner degree of wear and the dried wet degree of coke etc., residual value behind each blowing is constantly to change, therefore claim that in order to make floors can reflect faster and betterly that residual value is to the influence of blending process, need after finishing, each concentrated scale hooper discharge need symmetrical floors to revise.Therefore the nothing that provides of the embodiment of the invention disperses that the coke Weighting and Controlling System also comprises correcting module under the blast furnace groove of bucket.

The correction of this correcting module symmetry floors is carried out according to following:

W′ _{cdz_n+1}=k ₁·W _{lk_n}+k ₂·(W _{lk_n}-W _{lk_n-1})

In the formula, described W ' _{Cdz_n+1}For claiming floors from revised the n+1 time; W _{Cdz_n+1}Be the n+1 time behind amplitude limit title floors; k ₁Be this gain; k ₂Be the trend gain; C _MaxFor claiming the floors upper limit; W _{Lk_n}It is residual value after the n time blowing finished; W _{Lk_n-1}It is residual value after the n-1 time blowing finished.

Below in conjunction with a specific examples, be introduced why stopping the belt lead:

If the n time weighing target value W _{Targ_n}Be 5000 kilograms, lead W _{Adv2_n}Be 800 kilograms, when actual weight (obtaining from weight sensor) reached 4200 kilograms, burnt belt stopped when then preparing burden, and relied on inertia to continue to prepare burden to concentrating in the scale hooper.(this is W afterwards to concentrate scale hooper actual weight to reach 5100 kilograms if burnt belt stops (this moment, the weight sensor reading no longer increased) fully _{Lm_n}), the E in this up-to-date style (3) _Adv=100, illustrate that 800 kilograms lead is big inadequately, can greatly (specifically transfer greatly to what value by gain k in formula (3) definite) its accent from correction algorithm this moment, supposes k=0.75, and then lead can be adapted to 875, i.e. lead W during the n+1 time weighing _{Adv2_n+1}=875.If the n+1 time weighing target value is 5000 still, when actual weight (obtaining from weight sensor) reached 4125 kilograms, belt just stopped when then preparing burden.So according to every batch of ground practical situation this lead is revised, be its objective is that the actual weight that making prepares burden finishes (being that belt stops fully) is consistent with the weighing target value as far as possible.

Coke Weighting and Controlling System under the blast furnace groove that disperses to struggle against according to nothing provided by the invention, it is the system of the actual coke weighing curve constructed " two lead " when disperseing bucket according to nothing, both guaranteed weighing precision, make again and do not pile up a large amount of materials on feeding device and the feed belt, prolonged the work-ing life of equipment; In addition, also the factor that influences weighing precision has been made up from update the system as claiming floors, lead etc., guaranteed the accuracy of single weighing and feed total mass to greatest extent.

Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (6)

1. one kind is not had coke Weighting and Controlling System under the blast furnace groove that disperses bucket, it is characterized in that, comprising:

Control module, concentrated scale hooper, storagetank, feeding machine and vibratory screening apparatus;

Described control module is controlled described feeding machine, vibratory screening apparatus and burnt belt successively and is stopped, thereby with the described concentrated scale hooper of material dispensing of storagetank storage;

Concentrate scale hooper, under the control of described control module, carry out discharge according to described batching; Described control module comprises:

First determining unit is determined the weighing target value

Wherein,

E _k=W _k-W _{Set_k}(k=1,2 ..., n);

In the formula, described W _{Set_n}Be the n time set(ting)value; α is moisture content; E _ComBe to answer compensating error the n time; W _{Cdz_n}Be the n time title floors; E _MaxBe the single error compensation upper limit; E _SumBe progressive error; E _kBe the n time error;

Second determining unit according to described weighing target value, determines to stop the lead W of described burnt belt _{Adv2_n}, determine to stop the lead W of described feeding machine and described vibratory screening apparatus _{Adv1_n}

Wherein, W _{Adv 2_n+1}'=W _{Adv 2_n}+ kE _{Adv_n},

Wherein, E _{Adv_n}=W _{Lm_n}-W _{Targ_n},

In the formula, described W _{Adv2_n+1}' be from revised the n+1 time lead; Described W _{Adv2_n+1}Be the n+1 time lead behind the amplitude limit; Described k is the lead modified gain; Described A _MaxFor stopping the belt lead upper limit; Described W _{Adv2_n+1}Be the n+1 time lead; Described E _{Adv_n}Be that the n time weighing material completely is worth poor with target value, namely stop the error of belt lead, described W _{Lm_n}Be that the n time weighing material completely is worth;

$(t_{\mathrm{glys}}+k_{\mathrm{pd}}\&CenterDot;t_{\mathrm{pdys}}){\mathrm{\&omega;}}_{\mathrm{gj}}<W_{\mathrm{advl}\_n}<\frac{l_{\mathrm{gj}}}{v_{\mathrm{gj}}}{\mathrm{\&omega;}}_{\mathrm{gj}},$ W _{Adv1_n}W _{Adv2_n}, in the formula, described t _GlysBe the time-delay between feeding machine and the vibratory screening apparatus; k _PdThe conversion factor of inertia operation when shutting down for belt; t _PdysInertia working time when shutting down for belt; ω _GjFor supplying burnt belt to the speed of concentrating the scale hooper feed; l _GjBe the effective fed distance for burnt belt; v _GjBe the belt travelling speed.

2. Controlling System according to claim 1 is characterized in that, also comprises:

Correcting module, behind each concentrated scale hooper discharge, symmetrical floors is revised, i.e. W ' _{Cdz_n+1}=k ₁W _{Lk_n}+ k ₂(W _{Lk_n}-W _{Lk_n-1}),

In the formula, described W ' _{Cdz_n+1}For claiming floors from revised the n+1 time; W _{Cdz_n+1}Be the n+1 time behind amplitude limit title floors; k ₁Be this gain; k ₂Be the trend gain; C _MaxFor claiming the floors upper limit; W _{Lk_n}It is residual value after the n time blowing finished; W _{Lk_n-1}It is residual value after the n-1 time blowing finished.

3. system according to claim 1 and 2 is characterized in that:

Described control module realizes by DSP, ARM, FPGA or PLC.

4. system according to claim 1 is characterized in that, also comprises:

Frequency transformer, described frequency transformer are connected described control module and supply between the burnt belt.

5. system according to claim 4 is characterized in that:

Described concentrated scale hooper all disposes limit switch and weight sensor; Described weight sensor is connected with described frequency transformer.

6. system according to claim 4 is characterized in that, also comprises:

Velocity sensor, described velocity sensor are connected described frequency transformer and supply between the burnt belt.

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