CN103033050B - Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system - Google Patents
Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system Download PDFInfo
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- CN103033050B CN103033050B CN201210578971.5A CN201210578971A CN103033050B CN 103033050 B CN103033050 B CN 103033050B CN 201210578971 A CN201210578971 A CN 201210578971A CN 103033050 B CN103033050 B CN 103033050B
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- large flue
- main exhauster
- sintering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/06—Endless-strand sintering machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A frequency conversion control method for a main exhaust fan of a sintering system, which is provided by the invention, includes: (1) acquiring sintered material quantity; (2) utilizing the sintered material quantity and a preset sintering end point to calculate the vertical sintering speed of material, and utilizing the relation between the vertical sintering speed and effective air volume to calculate effective large flue air volume; (3) detecting the flue gas components of a large flue; (4) utilizing the flue gas components of the large flue to calculate an effective air rate, and calculating target large flue air volume; (5) utilizing the corresponding relation between large flue air volume and main exhaust fan rotation speed to query target main exhaust fan rotation speed corresponding to the target large flue air volume; (6) regulating the current main exhaust fan frequency to target main exhaust fan frequency corresponding to the target main exhaust fan rotation speed. The invention also provides a frequency conversion control system for the main exhaust fan of the sintering system. According to the scheme, the consumption and loss of electricity of the sintering system as the result of the mismatching between the power provided in the operation of the main exhaust fan and system load can be reduced.
Description
Technical field
The present invention relates to sintering system control technology, relate in particular to sintering system main exhauster method for controlling frequency conversion and system.
Background technology
Along with developing rapidly of modern industry, iron and steel production scale is increasing, and energy resource consumption is also more and more, and energy-conserving and environment-protective index more and more becomes the important investigation factor of steel manufacture process.In iron and steel is produced, iron-bearing material ore needs through sintering system processing before entering blast furnace process, namely, by various powdery iron-containing raw materials, allocate appropriate fuel and flux into, add appropriate water, after mixing and pelletizing, cloth is placed on roasting on pallet, makes it that series of physical chemical change occur, form the sintering deposit of easily smelting, this process is referred to as sintering.
Sintering system mainly comprises multiple equipment such as pallet, mixer, main exhauster, central cooler, its total technological process is shown in Figure 1: various raw materials are through proportioning room 1 proportioning, form mixed material, mixed material enter mixer 2 mix with pelletizing after, pass through round roller batcher 3 and nine roller material distributing machine 4 by its uniformly dispersing formation bed of material on pallet 5, igniting blower fan 12 and the blower fan 11 of igniting start material igniting and start sintering process again.It is cooling that the sintering deposit obtaining after sintering completes enters central cooler 9 after single roll crusher 8 fragmentations, finally by delivering to blast furnace or finished product ore storage bin after the whole grain of screening.Wherein, the oxygen that sintering process needs is provided by main exhauster 10, pallet 5 belows are provided with multiple vertical bellows 6 side by side, the large flue (or claiming flue) 7 that bellows 6 belows are horizontal setting, large flue 7 is connected with main exhauster 10, the negative pressure wind that main exhauster 10 produces by large flue 7 and bellows 6 is through chassis, for sintering process provides combustion air.
For guaranteeing sintering quality, conventionally at initial stage of sintering, the thickness of feed layer on pallet speed and pallet is regulated the fixed position (being generally second-to-last bellows on pallet) that sintering end point is remained on substantially set in advance.Once after system stability, sintering material layer thickness no longer changes conventionally, and main exhauster of sintering is in stable condition, and its rotating speed is non-adjustable, by regulating main exhausting door to maintain whole sintering system negative regulation, the adjusting of sintering end point is by regulating pallet speed to remain substantially constant.On the other hand, in actual production process, due to the impact of the market factor, raw material memory space factor, sintering deposit memory space factor etc., sometimes also need to regulate Sintering Yield, and then adjusting sintered material amount, general sintered material density, pallet width are determined, after sintered material amount changes, can change pallet speed and/or thickness of feed layer.Obviously, as long as sintered material amount changes, as constant in sintering negative pressure, will cause sintering end point to depart from predefined fixed position, and then cannot ensure sintering quality, and the main throttle opening of taking out that only changes in original mode regulates to change negative pressure.
In the actual course of work, for variation and the throughput requirements of reply sintering operating mode change the impact on sintering process (being sinter quality), in existing sintering process, the main exhauster of sintering system is conventionally according to its design maximum rotation speed operation, its adjustment process all adopts air door regulative mode, and this must cause too high power consumption and loss.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of sintering system main exhauster method for controlling frequency conversion and system, to solve the too high power consumption of sintering system and loss problem.
For achieving the above object, the embodiment of the present invention provides a kind of sintering system main exhauster method for controlling frequency conversion, and the method comprises the following steps:
1) obtain sintered material amount;
2) utilize sintered material amount and default sintering end point to calculate the vertical sintering speed of the bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate;
3) detect using smoke from big gas duct composition;
4) utilize described using smoke from big gas duct composition to calculate effective wind rate, and, calculate large flue target air quantity, wherein, large flue target air quantity equals large flue effective wind rate divided by effective wind rate;
5) utilize the corresponding relation of large flue air quantity and main exhauster rotating speed, search the main exhauster rotating speed of target that large flue target air quantity is corresponding;
6) regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target.
According to above-mentioned control method, owing to obtaining large flue target air quantity according to the variation of sintered material amount, and, finally regulate main exhauster frequency according to large flue target air quantity, make the main exhauster frequency can be with the variation dynamic adjustments of sintered material amount, realize the dynamic equilibrium between changing of the power consumption of main exhauster and load, thereby in reduction sintering process, main exhauster power does not mate with load the power consumption and the loss that cause, also can avoid existing mode only to change the main throttle opening of taking out to change the larger energy consumption regulative mode of negative pressure by employing simultaneously.
In another embodiment based on above-mentioned control method, also comprise the steps:
Detect the current air quantity of large flue;
Calculate the difference of the current air quantity of large flue and large flue target air quantity;
If described difference is more than or equal to setting threshold, regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise, the aperture that regulates bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
If the embodiment of the present invention is applied to the control of 180 square metres of sintering machines, compared with not adopting the solution of the present invention, can realize electric energy and save approximately 15%, the Spring Festival holidays are economized electric energy approximately 1,080 ten thousand degree, can bring monetary savings, reduce many economic and social benefits such as disposal of pollutants.(180 square metres of sintering machine annual productions are 1,800,000 tons, and product electrisity consumption mean value per ton is 40 degree).If the embodiment of the present invention is applied to the control of 360 square metres of sintering machines, compared with not adopting the solution of the present invention, can realize electric energy and save approximately 15%, the Spring Festival holidays are economized electric energy approximately 2,160 ten thousand degree, can bring monetary savings, reduce many economic and social benefits such as disposal of pollutants.
Of particular note, in sintering system, there is the equipment that is much mutually related, comparatively speaking, with the associated equipment of more miscellaneous equipment, can be called system equipment, as pallet, main exhauster etc.; And with the associated equipment of less equipment, can be called local devices, as valve of bellows, bellows etc.Obviously, regulating system equipment, as regulating platform vehicle speed, regulate main exhauster frequency larger to systematic influence; And adjusting local devices is less on the impact of system.Therefore, in sintering system, by local devices, but not by the adjusting of system equipment, system is exerted one's influence, be conducive to system stability and extension device life-span.Therefore, in the embodiment of the present invention, only have in the time that the difference of the current air quantity of large flue and large flue target air quantity is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise the aperture of adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.The embodiment of the present invention is to maintain machine speed and main exhauster frequency and main exhausting door stabilizes to prerequisite, in the time that air quantity changes greatly, regulate target by regulating main exhauster frequency to realize, and change hour at air quantity, regulate target by regulating the aperture of sintering bellows valve to realize, and then realize the vertical speed that regulates material sintering, thereby more critically control sintering process and sintering end point.Can certainly regulate main exhauster air door to realize and regulate target, but steady in order to ensure the change working of system, regulating bellows valve is the preferred version that air door regulates.Visible, the embodiment of the present invention provides a kind of regulative mode that is conducive to system stability.
In preferred version, obtain in such a way sintered material amount,
21) continuously or periodically detect the mass flow that all clothes of material distributing machine export;
22) the cumulative average that detects all cloth outlet material flows that obtain;
23) calculate sintered material amount according to accumulation result.
In this preferred version, by continuously or periodically detecting the inventory of all cloth outlets in the unit interval, all cloth outlets average continuous or periodically testing result is added up, and, sintered material amount calculated according to accumulation result.By repeatedly measuring and asking the mode of sintered material amount can reduce the error of measurement with the average of measurement result repeatedly, can improve the sintered material amount accuracy of obtaining.In addition, this scheme detects the inventory of material distributing machine cloth exporting unit's time, detect at the conveying source place of material, can within the short as far as possible time, obtain real sintered material amount data, the control lag that the hysteresis of reduction sintered material amount data acquisition causes.
On the basis of above-mentioned preferred version, the scheme of further optimizing is:
In step 22) and 23) between also comprise: whether the difference that judges adjacent twice accumulation result in setting range, if so, goes to step 23); Otherwise, go to step 22).
This scheme judges repeatedly cumulative result, and the sintered material amount sudden change situation that accidentalia is caused is got rid of, to obtain more accurate sintered material amount.
Preferably, periodically detect the smoke components of each bellows, the smoke components using the average of the smoke components of repeated detection as each bellows.
This scheme is by periodically detecting the smoke components in large flue, can make the calculating of effective wind rate and target air quantity more accurate, and then be updated periodically target air quantity, final realize target air quantity mates with the accurate of sintered material amount, and the flux matched degree of the adjusting of guarantee main exhauster frequency values and sintered material is higher.
The embodiment of the present invention also provides sintering system main exhauster frequency-changing control system, comprising:
Initial parameter acquiring unit, for obtaining sintered material amount;
The first computing unit, for utilizing the vertical sintering speed of sintered material amount and the default sintering end point calculating bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate;
Detection of exhaust gas compositions unit, for detection of sintering system using smoke from big gas duct composition;
The second computing unit, for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal large flue effective wind rate and calculate large flue target air quantity divided by effective wind rate;
Target component acquiring unit, for utilizing the corresponding relation of large flue air quantity and main exhauster rotating speed, searches the main exhauster rotating speed of target that large flue target air quantity is corresponding;
Controller, for regulating the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target.
The beneficial effect that above-mentioned control system obtains, with reference to the beneficial effect of above-mentioned control method part, does not repeat them here.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention, below the accompanying drawing using in embodiment or description of the Prior Art is briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other embodiment diagram.
Fig. 1 is the structural representation of conventional sintering system;
Fig. 2 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the present invention one provides;
Fig. 3 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the present invention two provides;
Fig. 4 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the present invention three provides;
Fig. 5 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the present invention four provides;
Fig. 6 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the present invention five provides;
Fig. 7 is the sintering system main exhauster frequency-changing control system structural representation that the embodiment of the present invention six provides;
Fig. 8 is the sintering system main exhauster frequency-changing control system structural representation that the embodiment of the present invention seven provides;
Fig. 9 is the main exhauster frequency-changing control system structural representation of the sintering system that provides of the embodiment of the present invention eight.
Detailed description of the invention
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
In sintering system, load is usually expressed as various ways, as, sintered material amount, thickness of feed layer, even, due to the relevance of equipment, an equipment may be the load of another associate device, for example machine speed may be just the load of main exhauster.In reality, have a lot of reasons, as equipment fault, design change, cause load variations or fluctuation, thereby change or affect the balance of sintering system and stablize, now, just need to change the duty of system relevant device, that is, carry out system adjusting, otherwise just there will be sintering quality not ensure, or environmental pollution, invalid energy consume the problems such as excessive.
Embodiment mono-
Please refer to accompanying drawing 2, the figure shows the sintering system main exhauster method for controlling frequency conversion flow process that the embodiment of the present invention one provides.
The control method object that the embodiment of the present invention provides is, in the time that sintered material amount changes, guarantee under sinter quality (sintering end point that is sintering deposit is constant) prerequisite, how to regulate adaptively main exhauster frequency according to the variation of sintered material amount, do not mate with sintered material amount the power consumption and the loss that cause with the main exhauster frequency that reduces sintering process.
Flow process shown in Fig. 2, comprising:
S101, obtain sintered material amount.
In practical work process, due to the impact of the market factor, raw material memory space factor, sintering deposit memory space factor etc., the Sintering Yield of sintering system needs constantly to regulate, and then sintered material amount may need continuous adjusting.Even if sintered material amount is definite, owing to being subject to the impact of stabilization of equipment performance, the sintered material amount in different time sections also may change.For making main exhauster frequency with the dynamic change of sintered material amount, need to regulate adaptively main exhauster frequency according to the dynamic change of sintered material amount, will obtain like this sintered material amount of sintering system.Certainly, described sintered material amount can be according to the predefined value of output plan, can be also the value detecting by actual checkout gear.
S102, calculating large flue effective wind rate.
The air capacity that participates in burning in the effective wind rate unit of referring to material sintering process, large flue effective wind rate refers to the air capacity that participates in burning under current sintered material amount.In the present embodiment, the sintering end point of sintering deposit presets, like this, sintered material amount and the default sintering end point that just can utilize step S101 to obtain, calculate the vertical sintering speed of the bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate.
Concrete computational process is:
E=S
chassis* H
the bed of material* V
chassis* ρ (1)
Wherein: E is the sintered material amount of unit interval; S
chassisit is pallet width; H
the bed of materialit is thickness of feed layer; V
chassispallet speed; ρ is sintered material density.
In sintering process, need to ensure that sintering end point is constant, at this moment, when material bed arrival sintering end point, just grilled thoroughly, material bedly grilled thoroughly time t used
1run to the time t of sintering end point from the original position of pallet with material
2equate, that is:
t
1=t
2 （2）
And, t
1=H
the bed of material/ V
⊥(3)
Wherein: H
the bed of materialit is thickness of feed layer; V
⊥it is vertical sintering speed.
And, t
2=N/V
chassis, (4)
Wherein: N is the distance of default sintering end point apart from sintering original position, V
chassispallet speed.
Above-mentioned formula (2) (3) (4) is brought in formula (1), obtains:
V
⊥=E/S
chassis/ ρ/N (5)
Referring to above-mentioned formula (5), due to sintered material amount, E obtains in step S101, and for the sintering system of producing specific material, default sintering end point is known apart from the distance N of sintering original position, pallet width S
chassisbe and set constant known quantity with sintered material density p, therefore, can obtain the vertical sintering speed V of the bed of material
⊥.
In production process, vertical sintering speed and effective wind rate have following relation:
V
⊥=Q
have/ E/Q
t mark(6)
Wherein: Q
havelarge flue effective wind rate, Q
t markbe the air quantity of the required participation burning of unit material thorough roasting under standard state, this parameter is determined by material variety, Q
t markit is known parameters.
By formula (6), more just can calculate large flue effective wind rate in conjunction with sintered material amount, the corresponding large flue effective wind rate of sintered material amount that step S101 obtains.
S103, detection using smoke from big gas duct composition.
In this step, adopt flue gas analyzer to detect smoke components after participating in sintering reaction, testing result is used for calculating effective wind rate.
Certainly, using smoke from big gas duct composition can directly detect in large flue, also can calculate by the smoke components that detects each bellows.Preferred scheme is: the smoke components that detects each bellows; Using the average of the smoke components of all bellows as using smoke from big gas duct composition.Owing to directly each bellows being detected, the flue gas of just having participated in sintering reaction can react actual sintered process, so this kind of mode can improve the accuracy of detection of using smoke from big gas duct composition.Meanwhile, using the average of each bellows smoke components as using smoke from big gas duct composition, can further improve the accuracy of using smoke from big gas duct composition measurement, the impact that indivedual bellows smoke components that reduction accidentalia causes suddenly change on testing result.
The more preferred mode of one is: periodically detect the smoke components of each bellows, the smoke components using the average of the smoke components of repeated detection as each bellows.By periodically detecting smoke components, the main exhauster frequency after regulating is more accurately mated with sintered material amount, make the circulation of main exhauster frequency regulate more and optimize.
S104, calculating large flue target air quantity.
Utilize using smoke from big gas duct composition to calculate effective wind rate, and, calculate large flue target air quantity, wherein, large flue target air quantity equals large flue effective wind rate divided by effective wind rate.Effectively wind rate refers to effective wind rate in sintering process and accounts for the ratio of total blast volume.
In material bed sintering process, the oxygen in the air quantity that main exhauster can not produced be completely consumed, but only some oxygen participates in sintering reaction, so, can understand the oxygen situation of supplies consumption in sintering process by smoke components.In the present embodiment, detect using smoke from big gas duct composition, mainly detect O in unit volume flue gas
2, CO, CO
2, N
2, NO, NO
2content.
Because air enters in sintering reaction process, oxygen need participate in the reaction such as iron ore solid phase reaction and coke burning, and therefore the oxygen in air inlet is after sintering process, and the amount of its oxygen in flue gas can change; Because nitrogen does not participate in the solid phase reaction of iron ore, thus nitrogen after sintering process with NO, NO
2, N
2form exist, can Measurement accuracy in flue gas.
According to the constant law of material, the stable content of nitrogen and oxygen in air, like this according to nitrogen in flue gas amount and oxidized nitrogen amount, just can calculate the nitrogen that enters in large flue and the amount of oxygen, according to remaining oxygen amount in the flue gas recording, utilize formula (a) accurately to calculate and participate in reaction amount of oxygen simultaneously.
Wherein:
In air, in amount of oxygen/air, nitrogen amount is a constant; Oxidized nitrogen amount can by flue gas analyzer, detect NO, NO
2amount calculates; Nitrogen in flue gas amount also can be by detecting the N obtaining in flue gas analyzer
2amount calculates.
Therefore, can calculate and participate in reaction amount of oxygen.
Participate in, after reaction amount of oxygen, utilizing formula (b) when calculating, can calculate the effective wind rate of large flue K.
Wherein: K is the effective wind rate of large flue, in flue gas, remaining oxygen amount can be by detecting the O obtaining in flue gas analyzer
2amount calculates.
Calculate large flue target air quantity Q by following formula (8)
target.
Q
target=Q
have/ K (8)
Step S105, search main exhauster rotating speed of target.
Utilize the corresponding relation of large flue air quantity and main exhauster rotating speed, search the main exhauster rotating speed of target that large flue target air quantity is corresponding, described large flue air quantity and the corresponding relation of main exhauster rotating speed refer to large flue corresponding main exhauster rotating speed in the time of different air quantity operating modes, in practical work process, described main exhauster rotating speed by experiment, detection and statistics obtain.
Step S106, adjusting main exhauster frequency.
Utilize the main exhauster rotating speed of target obtaining in step S105, regulate the current frequency of main exhauster to main exhauster target frequency corresponding to main exhauster rotating speed of target, thereby realize the adjusting to main exhauster frequency.
The technical scheme that embodiment mono-provides, draw large flue target air quantity according to the sintered material amount of obtaining and default sintering end point, utilize large flue target air quantity finally to regulate main exhauster frequency, finally realize the current frequency adjustment of main exhauster towards changing with the suitable main exhauster target frequency direction of sintered material amount, realize main exhauster according to the variation of sintered material amount and regulate adaptively, can reduce on the whole power consumption and the loss of sintering process.
According to embodiment mono-, as long as change as the sintered material amount of load, all need to regulate the frequency of main exhauster, the power consumption of main exhauster and the variation of load are adapted, thereby realize energy-conservation.But main exhauster, as system equipment, has a negative impact to the stability of whole sintering system to its adjusting meeting.Therefore, other embodiment based on described embodiment mono-provides an improved plan, this scheme, in load, when sintered material quantitative changeization is larger, regulates main exhauster, and in load variations hour, regulate bellows valve openings, like this adjusting of the adjusting of main exhauster and bellows valve opening is combined, in load variations hour, reach the effect of main exhauster frequency adjustment with the adjusting of bellows valve, thereby realize the less energy-conservation adjusting of whole sintering system impact.
Specifically, between the step S104 and step S105 of embodiment mono-, also comprise the steps:
S1, the current air quantity of detection large flue.
The difference of S2, the calculating current air quantity of large flue and large flue target air quantity.
S3, judge whether described difference is more than or equal to the threshold value of setting, if described difference is more than or equal to the threshold value of setting, carry out S105, otherwise, execution step S4;
The aperture of S4, adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
In sintering system, the validity of air quantity reduces along with the increase of air quantity, otherwise increases along with the minimizing of air quantity.For example, bed of material resistance is along with the sintering process duration is longer and more and more less, the reducing of bed of material resistance makes the air quantity by the bed of material increasing, the effective wind rate (being the oxygen containing in wind) that participates in sintering is fewer and feweri, corresponding air quantity validity is also just more and more less, now, and by regulating bellows valve openings (closing), suitably increase bellows negative pressure, be just conducive to the air quantity of remaining valid.
The effect of step S3 is, judge the variation size of load, to determine regulating main exhauster still to regulate bellows valve opening, determine in other words the selection of regulating measure, so that in the time that load variations is little, replace the adjusting to main exhauster by the adjusting to bellows valve, thereby make to regulate as far as possible little on the impact of sintering system.
The effect of step S4 is, determines that the aperture change of bellows valve greatly still diminishes.In the time obtaining large flue target air quantity, the variation that load is described needs system effective wind rate corresponding to described large flue target air quantity to provide, this effective wind rate is before bellows valve regulated, be can calculate under current bellows valve state,, current effective wind rate is multiplied by described large flue target air quantity, therefore, the target that bellows valve opening regulates, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated exactly.Wherein, the large flue air quantity that large flue effective wind rate can obtain by detection, calculates by effective wind rate.In view of those skilled in the art can realize this scheme according to the instruction of the present embodiment, this repeats no more.
Embodiment bis-
The control method that the present embodiment provides, utilizes the sintered material obtaining to measure large flue target air quantity, and utilizes the corresponding relation of large flue air quantity and main exhauster rotating speed to regulate main exhauster frequency.Because sintered material amount is generally obtained by means such as detections, so the degree of accuracy that sintered material amount is obtained is the key factor that affects main exhauster regulating effect.
Accompanying drawing 3 shows the sintering system main exhauster method for controlling frequency conversion flow process that embodiment bis-provides.According to Fig. 3:
S201, detect all cloth outlet material flows.
Detect continuously or periodically all cloth outlet material flows, detect the inventory of all cloth outlets of material distributing machine in the unit interval.In this step, detect continuously or periodically the mass flow of all cloth outlets of material distributing machine, to realize, all cloth implement export continuous several times of material distributing machine are detected, for the calculating of follow-up sintering inventory.
The average of S202, cumulative all cloth outlet material flows.
That is, each cloth outlet material flow that step S201 is detected is averaged, then, and the average of cumulative all cloth outlet material flows.
S203, calculating sintered material amount.
According to the calculating that in step S202, the cumulative result obtaining is calculated sintered material amount, above-mentioned accumulation result can be used as sintered material amount.
Wherein, continuous detecting is within a specific time period, and with the repeatedly mass flow of all cloth outlets of less time interval continuous collecting, the mass flow in the mass flow fluctuation situation that the cloth that is applicable to causing due to Equipment exports detects.This specific time period length is dynamic adjustments with equipment state, and the time interval sets in advance according to actual conditions, and for example time interval can be set to 1 second, 1.5 seconds or 2 seconds.In the time of mass flow with this Cloth Collection outlet in time interval, if continuously several times, as 3 times, the fluctuation of certain the cloth outlet material flow gathering is greater than the percentage of a setting, as 5%, can extend the acquisition time of cloth flow, until described acquisition time is more than or equal to the limiting value of adjusting, or the mass flow acquisition time of accumulative total is more than or equal to the limiting value of adjusting, or all clothes export the percentage that the continuous mass flow fluctuation gathering for three times is less than setting.The limiting value of described adjusting was an empirical value, as 20 seconds.
This specific time period is actually the execution cycle of step S203, and the time finishes to calculate once sintered inventory, further carries out subsequent step, and then completes Primary regulation.
It is in a special time period that described periodicity detects, and with the repeatedly mass flow of all cloth outlets of larger time interval continuous collecting, is applicable to equipment state stable, and the mass flow that cloth flowed fluctuation is less than in permissible value situation detects.Therefore, the special time period periodically detecting is conventionally longer, and for example 300 seconds, the time interval was also larger, for example 5 seconds or 10 seconds.
In a further embodiment, first adopt the mode periodically detecting, if the fluctuation of certain cloth outlet material flow of double collection is greater than the percentage of a setting, start continuous detecting mode, thereby mass flow is detected more to tally with the actual situation, be conducive to the timely adjusting of system, be conducive to again the stable operation of system equipment.
Another example changing about collection mass flow is with reference to the embodiment tri-shown in figure 4.
In embodiment bis-, step 204-208 is corresponding one by one with the step S102-106 in embodiment mono-, and this does not repeat.
With respect to embodiment mono-, the sintering system main exhauster method for controlling frequency conversion that embodiment bis-provides provides a kind of sintered material amount obtain manner of more optimizing, by detecting continuously or periodically the mass flow of all cloth outlets of material distributing machine, it is the inventory of all cloth outlets in the unit interval, then average continuous or periodically testing result is added up, utilize accumulation result to calculate sintered material amount.This kind of mode, by repeatedly measuring and asking sintered material amount with the average of repeatedly measuring, can reduce the error of measurement, and then improves the sintered material amount accuracy of obtaining.In addition, this scheme detects the cloth outlet material flow of material distributing machine, detects at the conveying source place of material, can obtain in time the most real sintered material amount, the control lag that the hysteresis that reduction numerical value obtains causes.
In the other embodiment based on described embodiment bis-, specifically, between the step S206 and S207 of embodiment bis-, also comprise the steps:
S1, the current air quantity of detection large flue.
The difference of S2, the calculating current air quantity of large flue and large flue target air quantity.
S3, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, carry out S207, otherwise, execution step S4.
The aperture of S4, adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Embodiment tri-
In sintered material amount acquisition process, the fluctuation of sintered material amount has uncertainty, and for example fluctuate time and fluctuating range are uncertain.
For this reason, embodiment tri-is optimized embodiment bis-.Please refer to accompanying drawing 4, the figure shows the sintering system main exhauster method for controlling frequency conversion flow process that embodiment tri-provides.
In the present embodiment, step S301-S302 is equivalent to the step S201-S202 in embodiment bis-, and step S304 is equivalent to the step S203 in embodiment bis-, still, between step S302 and step S304, also comprises the steps:
Step S303, judge that adjacent twice cumulative difference is whether in setting range.If so, go to step S304, this mass flow fluctuation that whole material distributing machine cloth outlet is described is less, and sintered material amount is comparatively stable, can be used as initial parameter; Otherwise, go to step S302.
Step S304 to S309 is corresponding one by one with the S203 to S208 in embodiment bis-, and appropriate section please refer to the content in embodiment bis-, and this does not repeat.
According to embodiment tri-, mass flow stability to the outlet of material distributing machine cloth has a preliminary judgement, then carry out corresponding operating according to judged result, realize under the metastable prerequisite of mass flow of material distributing machine cloth outlet and detect data, can improve the accuracy of obtaining sintered material amount.
In a further embodiment, between step S302 and step S303, also comprise determining step, if the mass flow acquisition time of accumulative total is greater than or equal to the limiting value of adjusting, or, all clothes of material distributing machine export the percentage that the continuous mass flow fluctuation gathering for three times is less than setting, go to step S304; Otherwise, go to step S303.
In the other embodiment based on described embodiment tri-, specifically, between the step S307 and S308 of embodiment tri-, also comprise the steps:
S1, the current air quantity of detection large flue;
The difference of S2, the calculating current air quantity of large flue and large flue target air quantity;
S3, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, carry out S308, otherwise, execution step S4;
The aperture of S4, adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Implement four
Above-described embodiment two and embodiment tri-, all obtain mass flow and then calculate sintered material amount in the cloth exit of material distributing machine.For the sintering system of producing specific material, the sintering end point setting in advance is known apart from the distance N of sintering original position, pallet width S
chassisall known with sintered material density p, so by detecting the material layer thickness H on pallet
the bed of materialwith pallet speed V
chassis, calculate sintered material amount by formula (1).Concrete operating process, please refer to accompanying drawing 5, the figure shows the sintering system main exhauster method for controlling frequency conversion flow process that the embodiment of the present invention four provides.
Shown in Fig. 5, flow process comprises:
S401, detection thickness of feed layer and pallet speed.
S402, calculating sintered material amount.
Calculate sintered material amount according to the formula in embodiment mono-(1).
In this embodiment, step S403 to S407 is corresponding one by one with the S102 to S106 in embodiment mono-, and this does not repeat.The control method that the present embodiment provides, by thickness of feed layer and pallet speed detection computations sintered material amount.
For making testing result more accurate, preferred, in above-mentioned steps S401, detect the thickness of feed layer of pallet and material distributing machine cloth outlet corresponding position.The thickness of feed layer at this position can direct reaction sintering inventory up-to-date variation, and can realize in time the adjusting of subsequent step to the detection at this position, final realization to main exhauster frequency values more in time, regulate exactly.
In the other embodiment based on described embodiment tetra-, specifically, between the step S405 and S406 of embodiment tetra-, also comprise the steps:
S1, the current air quantity of detection large flue.
The difference of S2, the calculating current air quantity of large flue and large flue target air quantity.
S3, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, carry out S406, otherwise, execution step S4.
The aperture of S4, adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Embodiment five
In the present embodiment, utilize the corresponding relation of large flue air quantity and main exhauster rotating speed, search the main exhauster rotating speed of target that large flue target air quantity is corresponding, regulate the current frequency of main exhauster to the corresponding main exhauster target frequency of described main exhauster rotating speed of target.In actual adjustment process, for ensureing the stationarity of equipment work, avoid the significantly adjusting of plant capacity as far as possible.The present embodiment improves on the basis of previous embodiment, please refer to accompanying drawing 6, and Fig. 6 shows the control method flow process that the embodiment of the present invention five provides.Wherein: step S501 is corresponding one by one to step S105 with step S101 to step S505, and this does not repeat.Step S506 realizes to step S508:
S506, judge that whether the difference of main exhauster rotating speed of target and the current rotating speed of main exhauster is greater than setting value, if so, goes to step S508; Otherwise, go to step S507.
S507, the current frequency of adjusting main exhauster are to main exhauster target frequency corresponding to main exhauster rotating speed of target.
S508, setting spacing regulate the current frequency of main exhauster, go to step S506.
In aforesaid way, in the time that the difference of main exhauster rotating speed of target and the current rotating speed of main exhauster is greater than setting value, for the impact on system miscellaneous equipment of the significantly power adjusting of avoiding equipment, need to regulate the current frequency of main exhauster to change towards main exhauster target frequency direction according to the spacing of setting, for example, taking 1 hertz as one spacing, until the main exhauster frequency after regulating and main exhauster rotating speed of target the difference between corresponding main exhauster target frequency be less than this setting value, finally directly the main exhauster frequency values after regulating is adjusted to the main exhauster target frequency that main exhauster rotating speed of target is corresponding.Certainly,, if taking 1 hertz as one spacing, setting value should be less than 1 hertz so.
In the other embodiment based on described embodiment five, specifically, between the step S504 and S505 of embodiment five, also comprise the steps:
S1, the current air quantity of detection large flue.
The difference of S2, the calculating current air quantity of large flue and large flue target air quantity.
S3, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, carry out S505, otherwise, execution step S4.
The aperture of S4, adjusting bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Embodiment six
Based on above-described embodiment one, embodiment six provides a kind of sintering machine main air exhauster frequency-changing control system, please refer to accompanying drawing 7, and system shown in Figure 7 comprises:
Initial parameter acquiring unit 601, for obtaining sintered material amount.Described sintered material amount can be according to the predefined value of output plan, can be also that checkout gear detects the detected value obtaining.
The first computing unit 602, for utilizing the vertical sintering speed of sintered material amount and the default sintering end point calculating bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate.
The computational process of the first computing unit 602 is as follows:
First, utilize the sintered material amount in formula (1) the unit of account time in embodiment mono-.
Secondly, utilize the vertical sintering speed of formula (5) the calculating bed of material in embodiment mono-.
Again. utilize the formula (6) in embodiment mono-to calculate large flue effective wind rate:
Detection of exhaust gas compositions unit 603, for detection of the using smoke from big gas duct composition of sintering system.The flue gas analyzer arranging in concrete control or operating system detects smoke components for calculating effective wind rate.Using smoke from big gas duct composition can directly detect in large flue, also can calculate by the smoke components that detects each bellows.
The second computing unit 604, for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal large flue effective wind rate and calculate large flue target air quantity divided by effective wind rate.
The computational process of the second computing unit 604 is as follows:
First, utilize the formula (7) in embodiment mono-to calculate effective wind rate.
Secondly, utilize the formula (8) in embodiment mono-to calculate large flue target air quantity.
Target component acquiring unit 605, for utilizing the corresponding relation of large flue air quantity and main exhauster rotating speed, searches the main exhauster rotating speed of target that large flue target air quantity is corresponding.
Description in the computational process reference example one of each computing module of above-mentioned control system, the beneficial effect that this control system has please refer to the beneficial effect of method part, and this does not repeat.
In other embodiment based on embodiment six, between the second computing unit 604 and target component acquiring unit 605, also comprise following unit (not shown in Fig. 7).
Air measuring unit, for detection of the current air quantity of large flue.
Judging unit, calculate the difference of the current air quantity of large flue and large flue target air quantity, and, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, indicating target parameter acquiring unit 605 is searched the main exhauster rotating speed of target that large flue target air quantity is corresponding, otherwise, indicating controller 606 regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Controller in the present embodiment, compared with controller 606 in embodiment six, changes.
Embodiment seven
The present embodiment improves on the basis of embodiment six.Please refer to accompanying drawing 8, initial parameter acquiring unit wherein comprises:
Mass flow detection sub-unit 701, for continuously or periodically detecting the mass flow of all cloth outlets of material distributing machine, continuously or periodically detects the inventory of all cloth outlets of material distributing machine in the unit interval.
Mass flow computation subunit 702, for the cumulative average that detects all cloth outlet material flows that obtain, calculates sintered material amount according to accumulation result.
Wherein, the first computing unit 703, detection of exhaust gas compositions unit 704, the second computing unit 705, target component acquiring unit 706 and controller 707 are corresponding one by one with the first computing unit 602, detection of exhaust gas compositions unit 603, the second computing unit 604, target component acquiring unit 605 and controller 606 in embodiment six respectively, and function is identical, do not repeat them here.
System described in the present embodiment, by detecting continuously or periodically the inventory of all cloth outlets in the unit interval, and adds up to all cloth outlets average continuous or periodically testing result, calculates sintered material amount according to accumulation result.This kind of mode, by repeatedly measuring and asking sintered material amount with the average of repeatedly measuring, can reduce the error of measurement, and then improves the accuracy that sintered material amount is obtained.
In addition, the mass flow of the cloth outlet of this scheme to material distributing machine detects, and detects at the conveying source place of material, can obtain in time more real sintered material amount, the control lag that the hysteresis that reduction numerical value obtains causes.
In other embodiment based on embodiment seven, between the second computing unit 705 and target component acquiring unit 706, also comprise following unit (not shown in Fig. 7).
Air measuring unit, for detection of the current air quantity of large flue.
Judging unit, calculate the difference of the current air quantity of large flue and large flue target air quantity, and, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, indicating target parameter acquiring unit 706 is searched the main exhauster rotating speed of target that large flue target air quantity is corresponding, otherwise, indicating controller 707 regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Embodiment eight
The embodiment of the present invention is improved on the basis of embodiment six, seven, please refer to accompanying drawing 9, and initial parameter acquiring unit wherein comprises:
Thickness of feed layer detection sub-unit 802, the thickness of feed layer for detection of pallet with the relative position, exit position of material distributing machine;
Pallet speed detection sub-unit 801, for detection of pallet speed;
Sintered material amount computation subunit 803, for calculating sintered material amount, wherein, sintered material amount=pallet width * pallet speed * sintered material density * thickness of feed layer.
Wherein, the first computing unit 804, detection of exhaust gas compositions unit 805, the second computing unit 806, target component acquiring unit 807 and controller 808 are corresponding one by one with the first computing unit 602, detection of exhaust gas compositions unit 603, the second computing unit 604, target component acquiring unit 605 and controller 606 in embodiment six respectively, and function is identical.
Control system described in the present embodiment, exports the thickness of feed layer of corresponding position by detecting the cloth of pallet and material distributing machine.The up-to-date variation of the thickness of feed layer energy direct reaction sintering inventory at this position, and can realize in time the adjusting to subsequent module to the detection at this position, final realization to main exhauster frequency values more in time, regulate exactly.
In other embodiment based on embodiment eight, between the second computing unit 806 and target component acquiring unit 807, also comprise following unit (not shown in Fig. 7).
Air measuring unit, for detection of the current air quantity of large flue.
Judging unit, calculate the difference of the current air quantity of large flue and large flue target air quantity, and, judge whether described difference is more than or equal to setting threshold, if described difference is more than or equal to the threshold value of setting, indicating target parameter acquiring unit 807 is searched the main exhauster rotating speed of target that large flue target air quantity is corresponding, otherwise, indicating controller 808 regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
Controller in the present embodiment, compared with controller 808 in embodiment eight, changes.
Sintered material amount described in the embodiment of the present invention one to eight, refers to the sintered material amount that in the unit interval, sintering system is processed, and its unit is the ton/time.Can be sintering system sintered material amount hourly, unit be ton/hour; Also can be the sintered material amount of every day, its unit be ton/sky.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. sintering system main exhauster method for controlling frequency conversion, is characterized in that, comprises the following steps:
1) obtain sintered material amount;
2) utilize sintered material amount and default sintering end point to calculate the vertical sintering speed of the bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate;
3) detect using smoke from big gas duct composition;
4) utilize using smoke from big gas duct composition to calculate effective wind rate, and, calculate large flue target air quantity, wherein, large flue target air quantity equals large flue effective wind rate divided by effective wind rate;
5) utilize large flue air quantity and main exhauster rotating speed corresponding relation, search the main exhauster rotating speed of target that large flue target air quantity is corresponding;
6) regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target.
2. method according to claim 1, is characterized in that, obtains in such a way sintered material amount:
21) continuously or periodically detect the mass flow that all clothes of material distributing machine export;
22) the cumulative average that detects all cloth outlet material flows that obtain;
23) calculate sintered material amount according to accumulation result.
3. method according to claim 2, is characterized in that step 22) and 23) between also comprise:
Whether the difference that judges adjacent twice accumulation result in the scope of setting, if so, goes to step 23); Otherwise, go to step 22).
4. method according to claim 1, is characterized in that, obtains in such a way sintered material amount: detect thickness of feed layer and the pallet speed of pallet and material distributing machine cloth outlet corresponding position, calculate in such a way sintered material amount:
Sintered material amount=pallet width * pallet speed * sintered material density * thickness of feed layer.
5. method according to claim 1, is characterized in that:
Detect the smoke components of each bellows;
Using the average of the smoke components of each bellows as using smoke from big gas duct composition.
6. method according to claim 5, is characterized in that: periodically detect the smoke components of each bellows, the smoke components using the smoke components average of repeated detection as each bellows.
7. method according to claim 1, is characterized in that, between step 5) and step 6), also comprises:
71) whether the difference that judges main exhauster rotating speed of target and the current rotating speed of main exhauster is greater than setting value, if so, goes to step 72); Otherwise, go to step 6);
72) regulate the current frequency of main exhauster to change to main exhauster target frequency corresponding to main exhauster rotating speed of target with the spacing of setting, go to step 71).
8. according to the method described in claim 1,2,3,4,5,6 or 7, it is characterized in that, also comprise:
Detect the current air quantity of large flue;
Calculate the difference of the current air quantity of large flue and large flue target air quantity;
If described difference is more than or equal to setting threshold, regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise, the aperture that regulates bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target air quantity before bellows valve regulated.
9. sintering system main exhauster frequency-changing control system, is characterized in that, comprising:
Initial parameter acquiring unit, for obtaining sintered material amount;
The first computing unit, for utilizing the vertical sintering speed of sintered material amount and the default sintering end point calculating bed of material, and, utilize the relation between vertical sintering speed and effective wind rate to calculate large flue effective wind rate;
Detection of exhaust gas compositions unit, for detection of sintering system using smoke from big gas duct composition;
The second computing unit, for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal large flue effective wind rate and calculate large flue target air quantity divided by effective wind rate;
Target component acquiring unit, for utilizing the corresponding relation of large flue air quantity and main exhauster rotating speed, searches the main exhauster rotating speed of target that large flue target air quantity is corresponding;
Controller, for regulating the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target.
10. system according to claim 9, is characterized in that, described initial parameter acquiring unit comprises:
Mass flow detection sub-unit, for continuously or periodically detecting the mass flow of all cloth outlets of material distributing machine;
Mass flow computation subunit, for the cumulative average that detects all cloth outlet material flows that obtain, calculates sintered material amount according to accumulation result.
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|---|---|---|---|
| CN201210578971.5A CN103033050B (en) | 2012-12-27 | 2012-12-27 | Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system |
| PCT/CN2013/090548 WO2014101790A1 (en) | 2012-12-27 | 2013-12-26 | Frequency change control method and system for main exhaust fan of sintering system |
| RU2015128275A RU2647411C2 (en) | 2012-12-27 | 2013-12-26 | Method and system for the frequency change control system of the main exhaust fan in the sintering system |
| BR112015014193-5A BR112015014193B1 (en) | 2012-12-27 | 2013-12-26 | METHOD AND FREQUENCY CHANGE CONTROL SYSTEM OF THE MAIN EXHAUST OF A SYNTERIZATION SYSTEM |
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| CN201210578971.5A CN103033050B (en) | 2012-12-27 | 2012-12-27 | Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system |
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| CN103033050B (en) * | 2012-12-27 | 2014-06-18 | 中冶长天国际工程有限责任公司 | Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system |
| CN104142070A (en) * | 2013-05-06 | 2014-11-12 | 宁夏嘉翔自控技术有限公司 | Intelligent treatment electrical automatic control system for smoke of electrically-calcined furnace |
| CN109341351A (en) * | 2018-10-24 | 2019-02-15 | 上海宝钢节能环保技术有限公司 | A kind of frequency conversion intelligent power-saving control method for steel works sintering main exhaust fan |
| CN111678339B (en) * | 2020-07-07 | 2024-06-11 | 中冶北方（大连）工程技术有限公司 | System and method for controlling temperature in flue gas hood of sintering machine |
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| BR112015014193B1 (en) | 2019-07-09 |
| BR112015014193A2 (en) | 2017-09-26 |
| CN103033050A (en) | 2013-04-10 |
| RU2647411C2 (en) | 2018-03-15 |
| RU2015128275A (en) | 2017-02-02 |
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