CN102344977A - Blast furnace under-groove coke weighing control system without dispersing hopper - Google Patents
Blast furnace under-groove coke weighing control system without dispersing hopper Download PDFInfo
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- CN102344977A CN102344977A CN2011103059569A CN201110305956A CN102344977A CN 102344977 A CN102344977 A CN 102344977A CN 2011103059569 A CN2011103059569 A CN 2011103059569A CN 201110305956 A CN201110305956 A CN 201110305956A CN 102344977 A CN102344977 A CN 102344977A
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- 238000005303 weighing Methods 0.000 title claims abstract description 92
- 239000000571 coke Substances 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000006185 dispersion Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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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
Technical Field
The invention relates to the technical field of blast furnace trough discharging control, in particular to a coke weighing control system under a blast furnace trough without a dispersing hopper.
Background
In recent years, in order to save land and investment, a mode of canceling dispersed weighing and only reserving concentrated weighing appears in the blast furnace coke supply. Under the new mode, the coke weighing curve form is greatly changed, so that the original weighing control system is not completely applicable.
Fig. 1 shows a coke weighing characteristic curve diagram in the existing dispersed weighing, in order to ensure the accuracy of the coke weight in the centralized weighing hopper, the traditional system generally adopts the method of setting the full lead to improve the weighing precision, namely, the feeding machine is stopped in advance when the weighing is about to reach the target value, and the residual mass weighing is completed through the inertia residual vibration of the equipment, but under the new process of only centralized weighing, the method is not applicable.
Disclosure of Invention
The invention aims to provide a coke weighing control system under a blast furnace trough without a dispersing hopper, which ensures weighing precision and prevents a large amount of materials from being accumulated on feeding equipment and a feeding belt.
According to one aspect of the invention, the coke weighing control system under the blast furnace trough without a dispersion hopper comprises: a control module and a centralized weighing hopper;
the device comprises a control module, a centralized weighing hopper, a storage tank, a feeder and a vibrating screen;
the control module controls the feeding machine, the vibrating screen and the coke belt to stop in sequence, so that the materials stored in the storage tank are distributed to the centralized weighing hopper;
and the centralized weighing hopper is used for discharging materials according to the ingredients under the control of the control module.
And the centralized weighing hopper is used for discharging materials according to the ingredients under the control of the control module.
Further, the control module includes a first determination unit that determines the weighing target value <math>
<mrow>
<msub>
<mi>W</mi>
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<mi>t</mi>
<mi>arg</mi>
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</math> Ek＝Wk-Wset_k(k＝1，2，Λ，n)；
in the formula, Wset_nSetting the value for the nth time; alpha is the moisture content; ecomCompensating the error for the nth time; wcdz_nThe nth base value is weighed; emaxCompensating the upper limit for the single error; esumTo accumulate the error; enIs the nth error;
a second determining unit for determining the stopping of the coke belt according to the weighing target valueAdvance Wadv2_nDetermining the advance W for stopping the feeder and the vibrating screenadv1_n；
Wherein, Wadv2_n+1′＝Wadv2_n+k·Eadv_n，
Wherein E isadv_n＝Wlm_n-Wtarg_n，
In the formula, Wadv2_n+1' is the self-corrected (n + 1) th lead; the W isadv2_n+1The n +1 time lead after amplitude limiting; k is an advance correction gain; a is describedmaxThe upper limit of the advance of belt stop; the W isadv2_n+1Is the (n + 1) th lead; said Eadv_nThe difference between the full-load value and the target value of the nth weighing, namely the error of the belt stopping advance, Wlm_nThe full value of the weighed material for the nth time;
Wadv1_n＞Wadv2_nin the formula, the tglysThe time delay between the feeding machine and the vibrating screen is realized; k is a radical ofpdThe conversion coefficient of inertia running when the belt is stopped; t is tpdysThe inertia running time when the belt is stopped; omegagjThe feeding speed of the coke feeding belt to the centralized weighing hopper; lgjIs the effective conveying distance of the coke supply belt; v. ofgjIs the belt running speed.
Furthermore, the control system also comprises a correction module, and after each centralized weighing hopper discharges materials, the symmetrical bottom value is corrected, namely W'cdz_n+1＝k1·Wlk_n+k2·(Wlk_n-Wlk_n-1)，
Further, the control module is realized by a DSP, an ARM, an FPGA or a PLC.
Further, the frequency converter is connected between the control module and the coke supply belt.
Furthermore, the centralized weighing hoppers are all provided with limit switches and weight sensors; the weight sensor is connected with the frequency converter.
According to the weighing control system for the coke under the blast furnace trough without the dispersion hopper, which is provided by the invention, a double-lead system is constructed according to an actual coke weighing curve without the dispersion hopper, so that the weighing precision is ensured, a large amount of materials are not accumulated on the feeding equipment and the feeding belt, and the service life of the equipment is prolonged; a self-correcting system is constructed for factors influencing weighing precision, such as weighing base value, lead and the like, and accuracy of single weighing and total feeding mass is guaranteed to the maximum extent.
Drawings
FIG. 1 is a diagram showing a coke weighing curve in a conventional dispersion weighing;
FIG. 2 is a schematic structural diagram of a coke weighing control system under a blast furnace tank without a dispersion hopper according to an embodiment of the present invention;
FIG. 3 is a block diagram of the control module shown in FIG. 2;
FIG. 4 is a schematic diagram of a coke weighing curve without dispersion weighing according to an embodiment of the present invention;
the objects, functions and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
As shown in fig. 2, the weighing control system for coke under a blast furnace trough without a dispersion hopper according to the embodiment of the present invention includes a control module, a frequency converter, a storage trough, a centralized weighing hopper, a speed sensor, a feeder and a vibrating screen. The control module is used for controlling the feeding machine, the vibrating screen and the coke belt to stop in sequence, so that the materials stored in the storage tank are distributed to the centralized weighing hopper. The control module can be realized by DSP, ARM, FPGA or PLC. The centralized weighing hoppers are all provided with limit switches and weight sensors. The limit switch comprises an in-place opening position and an in-place closing position and is connected to the control module through a common cable. The limit switch can identify signals of in-place opening, out-of-place position (not in-place opening or closing), in-place closing and the like. The weight sensor converts the weight of the centralized weighing hopper into an electric signal and sends the electric signal to a corresponding weight transmitter, and the electric signal is accessed to the control module through a Profibus-DP bus. The weight value of the centralized weighing hopper can be accurately obtained through the weight sensor, so that signals of empty and full discharge are identified. When the coke supply amount is large, the frequency converter can be controlled by the control module, so that the starting process of the belt is smoother, the stopping process is quicker, and the coke supply capacity can be adjusted by adjusting the running speed of the coke supply belt. The speed sensor obtains the running speed of the coke supply belt, and when a frequency converter exists, the speed sensor can be directly connected into the frequency converter, so that speed information can be sent to the control module on one hand, and on the other hand, the speed sensor and the frequency converter can form a speed closed-loop control system.
The embodiment of the invention provides a weighing control system of coke under a blast furnace tank without a dispersion hopper, which is a 'double-lead' system constructed according to an actual coke weighing curve (see figure 4 for details) without the dispersion hopper. The specific value of the "double advance" can be realized by the control module. Referring to fig. 3, the control module includes a first determination unit 10 and a second determination unit 20.
The control module described above is described below with reference to fig. 4. Wherein, as shown in fig. 4, the starting point of the nth batching is the residual value W in the centralized weighing hopper after the last emptyinglk_n-1After weighing begins, the coke supply belt is started, and then the vibrating screen and the feeder are started in a delayed mode. Because the original material on the coke feeding belt and the new material of the feeding device have a certain interval, the weighing curve is in a step shape. Because of the inertia of the coke supply belt, it is necessary to weigh Wtarg_nBefore shutdown, the advance is recorded as Wadv2_n(ii) a Because the vibrating screen needs to be stopped in a delayed mode after the feeding machine is stopped and inertia residual vibration exists in the vibrating screen, in order to prevent the equipment from being damaged due to stacking on the coke supplying belt, the feeding machine and the vibrating screen need to be stopped before the belt is stopped, and the lead is recorded as Wadv1_n. A new residual value W is generated after the emptying is finishedlk_n。
A first determination unit 10 for determining a weighing target value <math>
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</math> Ek＝Wk-Wset_k(k＝1，2，Λ，n)；
in the formula, Wset_nSetting the value for the nth time; alpha is the moisture content; ecomCompensating the error for the nth time; wcdz_nThe nth base value is weighed; emaxCompensating the upper limit for the single error; esumTo accumulate the error; enIs the nth error. As can be seen from equation (1), the weighing target value comprehensively takes into account the influence of moisture, error, and residual value.
A second determining unit 20 for determining an advance amount W for stopping the coke belt based on the weighing target valueadv2_nDetermining the advance W for stopping the feeder and the vibrating screenadv1_n；
Wherein, Wadv2_n+1′＝Wadv2_n+k·Eadv_n
Wherein E isadv_n＝Wlm_n-Wtarg_n，
In the formula, Wadv2_n+1' is the self-corrected (n + 1) th lead; the W isadv2_n+1The n +1 time lead after amplitude limiting; k is an advance correction gain; a is describedmaxThe upper limit of the advance of belt stop; the W isadv2_n+1Is the (n + 1) th lead; said Eadv_nFor weighing the materials for the nth timeDifference between full value and target value, i.e. error in belt stop advance, Wlm_nThe full value of the weighed material for the nth time;
advance W for stopping feederadv1_nIs relatively complex and can be neither too small nor too large. This is because the vibrating screen is stopped with a delay after the feeder is stopped in order to protect the equipment, and the belt is allowed to stop after the vibrating screen is stopped, so if this value is too small, the vibrating screen may not be stopped and the coke weighing has exceeded the target value; if the amount is too large, the amount of the remaining material on the belt may not reach the target weighing value. For this purpose, Wadv1_nIt should satisfy:
Wadv1_n＞Wadv2_nin the formula, the tglysThe time delay between the feeding machine and the vibrating screen is realized; k is a radical ofpdThe conversion coefficient of inertia running when the belt is stopped; t is tpdysThe inertia running time when the belt is stopped; omegagjThe feeding speed of the coke feeding belt to the centralized weighing hopper; lgjIs the effective conveying distance of the coke supply belt; v. ofgjIs the belt running speed.
Because of the influence of concentrated weighing hopper lining wear degree and coke dry and wet degree, the residual value after each discharging is constantly changed, so in order to make the weighing bottom value can reflect the influence of the residual value on the batching process more quickly and better, the symmetrical bottom value needs to be corrected after the discharging of each concentrated weighing hopper is finished. Therefore, the coke weighing control system without the dispersing hopper under the blast furnace trough provided by the embodiment of the invention also comprises a correction module.
The correction of the symmetrical bottom value of the correction module is carried out as follows:
W′cdz_n+1＝k1·Wlk_n+k2·(Wlk_n-Wlk_n-1)，
The following describes how to advance belt stop in conjunction with a specific example:
setting the nth weighing target value Wtarg_nIs 5000 kg, lead Wadv2_nAt 800 kg, when the actual weight (obtained from the weight sensor) reaches 4200 kg during the batching, the coke belt is stopped and the batching continues to the centralized weighing hopper by means of inertia. If the coke belt is completely stopped (at the moment, the reading of the weight sensor is not increased any more), the actual weight of the centralized weighing hopper reaches 5100 kg (namely W)lm_n) When E in the formula (3)advWhen the lead of 800 kg is not large enough, the self-correction algorithm increases the lead (the specific value is determined by the gain k in the formula (3)) when the lead is 100, and when k is 0.75, the lead is corrected to 875, that is, the lead W at the time of weighing n +1adv2_n+1875. If the target value for the (n + 1) th weighing is still 5000, the belt is stopped when the actual weight (from the weight sensor) reaches 4125 kg at the time of dosing. The advance is thus corrected according to the actual conditions of each batch, with the aim of making the actual weight at which the batching is completed (i.e. the belt is completely stopped) as far as possible coincide with the weighing target value.
According to the weighing control system of the coke under the blast furnace tank without the dispersion hopper, which is provided by the invention, a double-lead system is constructed according to an actual coke weighing curve without the dispersion hopper, so that the weighing precision is ensured, a large amount of materials are not accumulated on the feeding equipment and the feeding belt, and the service life of the equipment is prolonged; in addition, a self-correcting system is constructed for factors influencing the weighing precision, such as weighing base value, advance and the like, and the accuracy of the single weighing and total feeding mass is guaranteed to the maximum extent.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a control system is weighed to coke under blast furnace groove of no dispersion fill which characterized in that includes:
the device comprises a control module, a centralized weighing hopper, a storage tank, a feeder and a vibrating screen;
the control module controls the feeding machine, the vibrating screen and the coke belt to stop in sequence, so that the materials stored in the storage tank are distributed to the centralized weighing hopper;
and the centralized weighing hopper is used for discharging materials according to the ingredients under the control of the control module.
2. The control system of claim 1, wherein the control module comprises:
a first determination unit for determining a weighing target value <math>
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</math> Ek＝Wk-Wset_k(k＝1，2，Λ，n)；
in the formula, Wset_nSetting the value for the nth time; alpha is the moisture content; ecomCompensating the error for the nth time; wcdz_nThe nth base value is weighed; emaxCompensating the upper limit for the single error; esumTo accumulate the error; enIs the nth error;
a second determining unit for determining the advance of stopping the coke belt according to the weighing target valueWadv2_nDetermining the advance W for stopping the feeder and the vibrating screenadv1_n；
Wherein, Wadv2_n+1′＝Wadv2_n+k·Eadv_n，
Wherein E isadv_n＝Wlm_n-Wtarg_n，
In the formula, Wadv2_n+1' is the self-corrected (n + 1) th lead; the W isadv2_n+1The n +1 time lead after amplitude limiting; k is an advance correction gain; a is describedmaxThe upper limit of the advance of belt stop; the W isadv2_n+1Is the (n + 1) th lead; said Eadv_nThe difference between the full-load value and the target value of the nth weighing, namely the error of the belt stopping advance, Wlm_nThe full value of the weighed material for the nth time;
3. The control system of claim 1, further comprising:
a correction module for correcting the symmetrical bottom value after the concentrated weighing hopper discharges materials, namely W'cdz_n+1＝k1·Wlk_n+k2·(Wlk_n-Wlk_n-1)，
4. The system according to any one of claims 1-3, wherein:
the control module is realized by a DSP, an ARM, an FPGA or a PLC.
5. The system of claim 1, further comprising:
and the frequency converter is connected between the control module and the coke supply belt.
6. The system of claim 5, wherein:
the centralized weighing hoppers are all provided with limit switches and weight sensors; the weight sensor is connected with the frequency converter.
7. The system of claim 5, further comprising:
and the speed sensor is connected between the frequency converter and the coke supply belt.
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| CN106544459A (en) * | 2016-12-08 | 2017-03-29 | 王旭民 | The control method that middle bucket simulation of gathering materials under a kind of blast furnace is weighed |
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| CN113564288A (en) * | 2021-07-28 | 2021-10-29 | 德龙钢铁有限公司 | Control method for lower vibrating screen of blast furnace trough |
| CN115341055A (en) * | 2022-08-19 | 2022-11-15 | 马鞍山钢铁股份有限公司 | Automatic weighing and discharging method under blast furnace material shortage preventing tank |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544459A (en) * | 2016-12-08 | 2017-03-29 | 王旭民 | The control method that middle bucket simulation of gathering materials under a kind of blast furnace is weighed |
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| CN113564288B (en) * | 2021-07-28 | 2022-07-22 | 德龙钢铁有限公司 | Method for controlling vibrating screen under blast furnace groove |
| CN115341055A (en) * | 2022-08-19 | 2022-11-15 | 马鞍山钢铁股份有限公司 | Automatic weighing and discharging method under blast furnace material shortage preventing tank |
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