CN103033050A - 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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- CN103033050A CN103033050A CN2012105789715A CN201210578971A CN103033050A CN 103033050 A CN103033050 A CN 103033050A CN 2012105789715 A CN2012105789715 A CN 2012105789715A CN 201210578971 A CN201210578971 A CN 201210578971A CN 103033050 A CN103033050 A CN 103033050A
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- large flue
- main exhauster
- sintering
- target
- air quantity
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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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- 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
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 the 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, the iron and steel production scale is increasing, and energy resource consumption is also more and more, and the energy-conserving and environment-protective index more and more becomes the important investigation factor of steel manufacture process.In iron and steel is produced, the iron-bearing material ore needs to process through sintering system before entering blast furnace process, namely, with various powdery iron-containing raw materials, allocate an amount of fuel and flux into, add an amount of water, after mixing and pelletizing, cloth is placed on roasting on the pallet, makes it that series of physical chemical change occur, form the sintering deposit of smelting easily, this process is referred to as sintering.
Sintering system mainly comprises a plurality of equipment such as pallet, mixer, main exhauster, central cooler, its total technological process is referring to shown in Figure 1: various raw materials are through proportioning room 1 proportioning, form mixed material, after mixed material enters mixer 2 mixings and pelletizing, pass through round roller batcher 3 and nine roller material distributing machine 4 with its uniformly dispersing formation bed of material on pallet 5, igniting blower fan 12 and the blower fan 11 of igniting start the materials igniting and begin sintering processes again.The sintering deposit that obtains after sintering is finished enters central cooler 9 coolings after single roll crusher 8 fragmentations, finally by delivering to blast furnace or finished product ore storage bin behind the whole grain of screening.Wherein, the oxygen that sintering process needs is provided by main exhauster 10, pallet 5 belows are provided with a plurality of vertical bellows 6 side by side, bellows 6 belows are the large flue (or claiming flue) 7 of horizontal setting, large flue 7 links to each other with main exhauster 10, the negative pressure wind process chassis that main exhauster 10 produces by large flue 7 and bellows 6 is for sintering process provides combustion air.
For guaranteeing sintering quality, usually at initial stage of sintering the thickness of feed layer on pallet speed and the pallet is regulated, so that sintering end point remains on the fixed position (being generally second-to-last bellows on the pallet) that sets in advance substantially.In case behind the system stability, sintering material layer thickness no longer changes usually, and main exhauster of sintering is in stable condition, and its rotating speed is non-adjustable, keep whole sintering system negative regulation by regulating main exhausting door, the adjusting of sintering end point is kept substantially constant by regulating pallet speed.On the other hand, in actual production process, because 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, can change pallet speed and/or thickness of feed layer after the sintered material amount changes.Obviously, constant such as the sintering negative pressure as long as the sintered material amount changes, will cause sintering end point to depart from predefined fixed position, and then can't guarantee sintering quality, and the main exhausting door aperture that only changes in original mode is regulated to change negative pressure.
In the course of work of reality, for the variation of reply sintering operating mode and throughput requirements change impact on sintering process (being sinter quality), in existing sintering process, the main exhauster of sintering system is usually according to its design maximum rotation speed operation, its adjustment process all adopts the 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 too high power consumption and the loss problem of sintering system.
For achieving the above object, the embodiment of the invention provides a kind of sintering system main exhauster method for controlling frequency conversion, and the method may further comprise the steps:
1) obtains the 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 the effective wind rate to calculate the large flue effective wind rate;
3) detect the 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 the 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 main exhauster rotating speed of target corresponding to large flue target air quantity;
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, because the variation according to the sintered material amount obtains large flue target air quantity, and, finally regulate the main exhauster frequency according to large flue target air quantity, so that the main exhauster frequency can be with the variation dynamic adjustments of sintered material amount, realize the power consumption of main exhauster and the dynamic equilibrium between the load variation, thereby main exhauster power and load do not mate power consumption and the loss that causes in the reduction sintering process, can avoid existing mode only to change main exhausting door aperture to change the larger energy consumption regulative mode of negative pressure by adopting simultaneously yet.
Among 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, then regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise, regulate the aperture of bellows valve, make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
If the embodiment of the invention is applied to the control of 180 square metres of sintering machines, with do not adopt the solution of the present invention and compare, can realize that electric energy saves approximately 15%, the Spring Festival holidays are economized about 1,080 ten thousand degree of electric energy, can bring many economic and social benefits such as monetary savings, reducing polluted emission.(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 invention is applied to the control of 360 square metres of sintering machines, with do not adopt the solution of the present invention and compare, can realize that electric energy saves approximately 15%, the Spring Festival holidays are economized about 2,160 ten thousand degree of electric energy, can bring many economic and social benefits such as monetary savings, reducing polluted emission.
It may be noted that especially has the equipment that much is mutually related in the sintering system, comparatively speaking, with the associated equipment of more miscellaneous equipment, can be called system equipment, such as pallet, main exhauster etc.; And with the associated equipment of less equipment, then can be called local devices, such as valve of bellows, bellows etc.Obviously, regulating system equipment is such as the regulating platform vehicle speed, to regulate the main exhauster frequency larger to systematic influence; And the adjusting local devices is then 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 invention, when only having difference when the current air quantity of large flue and large flue target air quantity more than or equal to setting threshold, if described difference is more than or equal to setting threshold, then regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise the aperture of regulating the bellows valve makes the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.The embodiment of the invention is to keep machine speed and main exhauster frequency and main exhausting door stabilizes to prerequisite, when air quantity changes greatly, realize regulating target by regulating the main exhauster frequency, and change hour at air quantity, realize regulating target by the aperture of regulating sintering bellows valve, and then the vertical speed that realizes regulating the material sintering, thereby more critically control sintering process and sintering end point.Can certainly regulate the main exhauster air door and realize regulating target, but for the change working that guarantees system is steady, regulating the bellows valve is the preferred version that air door is regulated.As seen, the embodiment of the invention provides a kind of regulative mode that is conducive to system stability.
In the preferred version, obtain in such a way the 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 the 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, the 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, namely detect at the place, conveying source 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 of judging adjacent twice accumulation result in setting range, if so, turns step 23); Otherwise, turn step 22).
This scheme is judged repeatedly cumulative result, the sintered material amount sudden change situation that accidentalia causes is got rid of, to obtain more accurate sintered material amount.
Preferably, periodically detect the smoke components of each bellows, with the average of the smoke components of the repeated detection smoke components as each bellows.
This scheme is by periodically detecting the smoke components in the large flue, can make the calculating of effective wind rate and target air quantity more accurate, and then be updated periodically the target air quantity, the accurate coupling of final realize target air quantity and sintered material amount, the flux matched degree of the adjusting of assurance main exhauster frequency values and sintered material is higher.
The embodiment of the invention also provides sintering system main exhauster frequency-changing control system, comprising:
The initial parameter acquiring unit is used for obtaining the sintered material amount;
The first computing unit is used for utilizing 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 the effective wind rate to calculate the large flue effective wind rate;
The detection of exhaust gas compositions unit is for detection of sintering system using smoke from big gas duct composition;
The second computing unit is used for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal the large flue effective wind rate and calculate large flue target air quantity divided by effective wind rate;
The target component acquiring unit for the corresponding relation that utilizes large flue air quantity and main exhauster rotating speed, is searched main exhauster rotating speed of target corresponding to large flue target air quantity;
Controller is used 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 does not repeat them here with reference to the beneficial effect of above-mentioned control method part.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention, the below does to introduce simply to the accompanying drawing that uses in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying 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 invention one provides;
Fig. 3 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the invention two provides;
Fig. 4 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the invention three provides;
Fig. 5 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the invention four provides;
Fig. 6 is the sintering system main exhauster method for controlling frequency conversion schematic flow sheet that the embodiment of the invention five provides;
Fig. 7 is the sintering system main exhauster frequency-changing control system structural representation that the embodiment of the invention six provides;
Fig. 8 is the sintering system main exhauster frequency-changing control system structural representation that the embodiment of the 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 invention eight.
The specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In the sintering system, load is usually expressed as various ways, as, sintered material amount, thickness of feed layer, even because the relevance of equipment, an equipment may be the load of another associate device, for example machine speed just may be the load of main exhauster.In the reality, have a lot of reasons, change such as equipment fault, design, cause load variations or fluctuation, thereby change or affect the balance of sintering system and stablize, at this moment, just need to change the duty of System Dependent equipment, that is, carry out system and regulate, can not guarantee otherwise sintering quality will occur, or environmental pollution, invalid energy consume the problems such as excessive.
Embodiment one
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 invention one provides.
The control method purpose that the embodiment of the invention provides is, when the sintered material amount changes, guarantee under sinter quality (sintering end point that is sintering deposit the is constant) prerequisite, how to regulate adaptively the main exhauster frequency according to the variation of sintered material amount, do not mate power consumption and the loss that causes with the main exhauster frequency and the sintered material amount that reduce sintering process.
Flow process shown in Figure 2 comprises:
S101, obtain the sintered material amount.
In practical work process, owing 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 the sintered material amount may need continuous adjusting.Even the sintered material amount determines that owing to be subject to the impact of stabilization of equipment performance, the sintered material amount in the different time sections also may change.For making the main exhauster frequency with the dynamic change of sintered material amount, need to regulate adaptively the 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, also can be the value by the checkout gear detection of reality.
S102, calculating large flue effective wind rate.
Participate in the air capacity of burning in the effective wind rate unit of the referring to material sintering process, the large flue effective wind rate refers to participate under the current sintered material amount air capacity of burning.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 the effective wind rate to calculate the 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 the 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 guarantee that sintering end point is constant, at this moment, just grilled thoroughly during material bed arrival sintering end point, material bedly grilled thoroughly used time t
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 that default sintering end point is apart from the distance of sintering original position, V
ChassisPallet speed.
Above-mentioned formula (2) (3) (4) is brought in the formula (1), obtains:
V
⊥=E/S
Chassis/ ρ/N (5)
Referring to above-mentioned formula (5), because sintered material amount E obtains in step S101, for the sintering system of producing specific material, default sintering end point is known apart from N apart from the sintering original position, the pallet width S
ChassisBe the constant known quantity of setting with the sintered material density p, therefore, can access the vertical sintering speed V of the bed of material
⊥
In the production process, vertical sintering speed and effective wind rate have following relation:
V
⊥=Q
Have/ E/Q
The t mark(6)
Wherein: Q
HaveThe large flue effective wind rate, Q
The t markBe the air quantity of the required participation burning of unit material thorough roasting under the standard state, this parameter is determined by material variety, Q
The t markIt is known parameters.
By formula (6), just can calculate the large flue effective wind rate in conjunction with the sintered material amount again, i.e. the corresponding large flue effective wind rate of sintered material amount that obtains of step S101.
S103, detection using smoke from big gas duct composition.
In this step, adopt flue gas analyzer that smoke components after participating in sintering reaction is detected, testing result is used for calculating effective wind rate.
Certainly, the 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; With the average of the smoke components of all bellows as the using smoke from big gas duct composition.Owing to directly each bellows is detected, the flue gas of just having participated in sintering reaction can react the actual sintered process, so this kind mode can improve the accuracy of detection of using smoke from big gas duct composition.Simultaneously, the average of each bellows smoke components as the using smoke from big gas duct composition, can further be improved the accuracy of using smoke from big gas duct composition measurement, reduce indivedual bellows smoke components sudden changes that accidentalia causes to the impact of testing result.
A kind of more preferred mode is: periodically detect the smoke components of each bellows, with the average of the smoke components of the repeated detection smoke components as each bellows.By periodically detecting smoke components, so that main exhauster frequency and sintered material amount after regulating are more accurately mated, make more optimization is regulated in the circulation of main exhauster frequency.
S104, calculating large flue target air quantity.
Utilize the 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 the large flue effective wind rate divided by effective wind rate.Effectively the wind rate refers to the ratio that effective wind rate in the sintering process accounts for total blast volume.
In material bed sintering process, the oxygen full consumption in the air quantity that main exhauster can be produced not fallen, but only some oxygen participates in sintering reaction, so, can understand the oxygen situation of supplies consumption in the sintering process by smoke components.In the present embodiment, detect the using smoke from big gas duct composition, mainly detect O in the unit volume flue gas
2, CO, CO
2, N
2, NO, NO
2Content.
Because air enters in the sintering reaction process, oxygen need participate in the reactions such as iron ore solid phase reaction and coke burning, so the oxygen in the 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 through after the sintering process with NO, NO
2, N
2Form exist, but in flue gas Measurement accuracy.
According to the constant law of material, the stable content of nitrogen and oxygen in the air, like this according to nitrogen in flue gas amount and oxidized nitrogen amount, just can calculate the interior nitrogen of large flue and the amount of oxygen of entering into, according to remaining oxygen amount in the flue gas that records, utilize formula (a) accurately to calculate and participate in the reaction amount of oxygen simultaneously.
Wherein:
In the air in amount of oxygen/air nitrogen amount be a constant; Oxidized nitrogen amount can by detect in the flue gas analyzer NO, NO
2Amount calculates; The nitrogen in flue gas amount also can be by detecting the N that obtains in the flue gas analyzer
2Amount calculates.
Therefore, can calculate participation reaction amount of oxygen.
After calculating participation reaction amount of oxygen, utilize formula (b), can calculate the effective wind rate of large flue K.
Wherein: K is the effective wind rate of large flue, and the remaining oxygen amount can be by detecting the O that obtains in the flue gas in the 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 the main exhauster rotating speed of target.
Utilize the corresponding relation of large flue air quantity and main exhauster rotating speed, search main exhauster rotating speed of target corresponding to large flue target air quantity, described large flue air quantity and the corresponding relation of main exhauster rotating speed refer to large flue corresponding main exhauster rotating speed when 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 that obtains among the 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 the main exhauster frequency.
The technical scheme that embodiment one 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 the main exhauster frequency, the final current frequency adjustment of main exhauster that realizes is towards changing with the suitable main exhauster target frequency direction of sintered material amount, realize that main exhauster regulates adaptively according to the variation of sintered material amount, can reduce on the whole power consumption and the loss of sintering process.
According to embodiment one, 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.Yet main exhauster is as system equipment, and its adjusting meeting is had a negative impact to the stability of whole sintering system.Therefore, other embodiment based on described embodiment one provides an improved plan, this scheme when namely the sintered material quantitative changeization is larger, is regulated main exhauster in load, and in load variations hour, regulate the bellows valve opening, like this adjusting of main exhauster and the adjusting of bellows valve opening are 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 one, 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 described difference whether more than or equal to the threshold value of setting, if described difference is then carried out S105 more than or equal to the threshold value of setting, otherwise, execution in step S4;
S4, the aperture of regulating the bellows valve make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
In the 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 that contains in the wind) that participates in sintering is then fewer and feweri, corresponding air quantity validity is also just more and more less, at this moment, and by regulating bellows valve openings (closing), suitably increase the bellows negative pressure, just be conducive to the air quantity of remaining valid.
The effect of step S3 is, judge the variation size of load, to determine that regulating main exhauster still regulates the bellows valve opening, determine in other words the selection of regulating measure, so that when load variations is little, by the adjusting of bellows valve being replaced the adjusting to main exhauster, thus make 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.When 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 the bellows valve regulated, be to calculate under the current bellows valve state, that is, current effective wind rate multiply by described large flue target air quantity, therefore, the target that the bellows valve opening is regulated makes the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated exactly.Wherein, the large flue air quantity that the large flue effective wind rate can obtain by detection calculates by effective wind rate.In view of those skilled in the art can realize according to the indication of present embodiment this scheme, this repeats no more.
Embodiment two
The control method that present embodiment provides is utilized the sintered material that obtains to measure large flue target air quantity, and is utilized the corresponding relation of large flue air quantity and main exhauster rotating speed that the main exhauster frequency is regulated.Because the sintered material amount is generally obtained by means such as detections, so the degree of accuracy that the sintered material amount is obtained is the key factor that affects the main exhauster regulating effect.
Accompanying drawing 3 shows the sintering system main exhauster method for controlling frequency conversion flow process that embodiment two provides.According to Fig. 3:
S201, detect all cloth outlet material flows.
Detect continuously or periodically all cloth outlet material flows, namely 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 the cloth implement export continuous several times detections to material distributing machine, 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 detects is averaged, then, the average of cumulative all cloth outlet material flows.
S203, calculating sintered material amount.
According to the calculating that the cumulative result who obtains among the step S202 calculates the sintered material amount, above-mentioned accumulation result namely can be used as the sintered material amount.
Wherein, continuous detecting is within a specific time period, with the less time interval continuous collecting mass flow of all clothes outlet repeatedly, is fit to because the mass flow in the mass flow fluctuation situation of the cloth outlet that Equipment causes detects.This specific time period length is dynamic adjustments with equipment state, and the time interval then sets in advance according to actual conditions, and for example the time interval can be set to 1 second, 1.5 seconds or 2 seconds.When with the mass flow of this Cloth Collection outlet in time interval, if continuously several times, such as 3 times, the fluctuation of certain the cloth outlet material flow that gathers such as 5%, then can prolong the acquisition time of cloth flow greater than the percentage of a setting, until described acquisition time is more than or equal to the limiting value of regulating, or the mass flow acquisition time of accumulative total is more than or equal to the limiting value of regulating, and perhaps, all clothes export the continuous mass flow fluctuation that gathers for three times less than the percentage of setting.The limiting value of described adjusting was an empirical value, such as 20 seconds.
This specific time period is actually the execution cycle of step S203, and the time end will be calculated once sintered inventory, further carry out subsequent step, and then finish Primary regulation.
It is in a special time period that described periodicity detects, and with the larger time interval continuous collecting mass flow of all clothes outlets repeatedly, it is stable to be fit to equipment state, and the cloth flowed fluctuation detects less than the mass flow in the permissible value situation.Therefore, the special time period that periodically detects is usually longer, and for example 300 seconds, the time interval was also larger, for example 5 seconds or 10 seconds.
In a further embodiment, at first adopt the mode that periodically detects, if the fluctuation of certain cloth outlet material flow of double collection is greater than the percentage of a setting, then start the continuous detecting mode, thereby mass flow is detected more to tally with the actual situation, namely be conducive to the timely adjusting of system, be conducive to again the stable operation of system equipment.
The example reference embodiment three shown in Figure 4 that another changes about gathering mass flow.
Among the embodiment two, step 204-208 is corresponding one by one with step S102-106 among the embodiment one, and this does not give unnecessary details.
With respect to embodiment one, the sintering system main exhauster method for controlling frequency conversion that embodiment two 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 the cloth outlets in the unit interval, then average continuous or periodically testing result is added up, utilize accumulation result to calculate the sintered material amount.This kind mode can reduce the error of measurement by repeatedly measuring and asking the sintered material amount with the average of repeatedly measuring, and then improves the sintered material amount accuracy of obtaining.In addition, this scheme detects the cloth outlet material flow of material distributing machine, namely detects at the place, conveying source of material, can in time obtain 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 two, specifically, between the step S206 and S207 of embodiment two, 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, whether judge described difference more than or equal to setting threshold, if described difference more than or equal to setting threshold, is then carried out S207, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Embodiment three
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, three couples of embodiment two of embodiment are optimized.Please refer to accompanying drawing 4, the figure shows the sintering system main exhauster method for controlling frequency conversion flow process that embodiment three provides.
In the present embodiment, step S301-S302 is equivalent to the step S201-S202 among the embodiment two, and step S304 is equivalent to the step S203 among the embodiment two, still, also comprises the steps: between step S302 and step S304
Step S303, judge that adjacent twice cumulative difference is whether in setting range.If so, turn step S304, this mass flow fluctuation that whole material distributing machine cloth outlet is described is less, and the sintered material amount is comparatively stable, can be used as initial parameter; Otherwise, turn step S302.
Step S304 to S309 is corresponding one by one with S203 to S208 among the embodiment two, and appropriate section please refer to the content among the embodiment two, and this does not give unnecessary details.
According to embodiment three, mass flow stability to the outlet of material distributing machine cloth has a preliminary judgement, then carry out corresponding operating according to judged result, be implemented under the metastable prerequisite of mass flow of material distributing machine cloth outlet and detect data, can improve the accuracy of obtaining the 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, perhaps, all clothes of material distributing machine export the mass flow fluctuation of continuous three collections less than the percentage of setting, and then turn step S304; Otherwise, turn step S303.
In the other embodiment based on described embodiment three, specifically, between the step S307 and S308 of embodiment three, 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, whether judge described difference more than or equal to setting threshold, if described difference more than or equal to setting threshold, is then carried out S308, otherwise, execution in step S4;
S4, the aperture of regulating the bellows valve make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Implement four
Above-described embodiment two and embodiment three all obtain mass flow and then calculate the sintered material amount in the cloth exit of material distributing machine.For the sintering system of producing specific material, the sintering end point that sets in advance is known apart from N apart from the sintering original position, the pallet width S
ChassisAll known with the sintered material density p, so by detecting the material layer thickness H on the pallet
The bed of materialWith pallet speed V
Chassis, calculate the 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 invention four provides.
Flow process shown in Figure 5 comprises:
S401, detection thickness of feed layer and pallet speed.
S402, calculating sintered material amount.
Calculate the sintered material amount according to the formula among the embodiment one (1).
Among this embodiment, step S403 to S407 is corresponding one by one with S102 to S106 among the embodiment one, and this does not give unnecessary details.The control method that present embodiment provides is by to thickness of feed layer and pallet speed detection computations sintered material amount.
For so that testing result is more accurate, preferred, among the 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 the direct reaction sintering inventory up-to-date variation, and can in time realize the adjusting of subsequent step to the detection at this position, the final realization to the main exhauster frequency values more in time, regulate exactly.
In the other embodiment based on described embodiment four, specifically, between the step S405 and S406 of embodiment four, 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, whether judge described difference more than or equal to setting threshold, if described difference more than or equal to setting threshold, is then carried out S406, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Embodiment five
In the present embodiment, utilize the corresponding relation of large flue air quantity and main exhauster rotating speed, search main exhauster rotating speed of target corresponding to large flue target air quantity, regulate the current frequency of main exhauster to the corresponding main exhauster target frequency of described main exhauster rotating speed of target.In the adjustment process of reality, for guaranteeing the stationarity of equipment work, avoid the significant adjusting of plant capacity as far as possible.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 invention five provides.Wherein: step S501 is corresponding one by one to step S105 with step S101 to step S505, and this does not give unnecessary details.Step S506 realizes to step S508:
S506, judge main exhauster rotating speed of target and the current rotating speed of main exhauster difference whether greater than setting value, if so, turn step S508; Otherwise, turn 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 are regulated the current frequency of main exhauster, turn step S506.
In the aforesaid way, when the difference of main exhauster rotating speed of target and the current rotating speed of main exhauster during greater than setting value, be the impact on system's miscellaneous equipment of the significant power adjusting of avoiding equipment, need to regulate the current frequency of main exhauster according to the spacing of setting changes towards main exhauster target frequency direction, for example take 1 hertz as a spacing, until the main exhauster frequency after regulating and main exhauster rotating speed of target the difference between the corresponding main exhauster target frequency set value less than this, last main exhauster frequency values after directly will regulating is adjusted to main exhauster target frequency corresponding to main exhauster rotating speed of target.Certainly, if take 1 hertz as a spacing, so the setting value should be less than 1 hertz.
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, whether judge described difference more than or equal to setting threshold, if described difference more than or equal to setting threshold, is then carried out S505, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the 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 is used for obtaining the sintered material amount.Described sintered material amount can be according to the predefined value of output plan, also can be that checkout gear detects the detected value that obtains.
The first computing unit 602 is used for utilizing 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 the effective wind rate to calculate the large flue effective wind rate.
The computational process of the first computing unit 602 is as follows:
At first, utilize sintered material amount in formula (1) unit of account time among the embodiment one.
Secondly, utilize the vertical sintering speed of formula (5) the calculating bed of material among the embodiment one.
Again. utilize the formula (6) among the embodiment one to calculate the large flue effective wind rate:
Detection of exhaust gas compositions unit 603 is for detection of the using smoke from big gas duct composition of sintering system.The flue gas analyzer that arranges in concrete control or the operating system detects smoke components and is used for calculating effective wind rate.The 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 is used for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal the 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:
At first, utilize the formula (7) among the embodiment one to calculate effective wind rate.
Secondly, utilize the formula (8) among the embodiment one to calculate large flue target air quantity.
Target component acquiring unit 605 for the corresponding relation that utilizes large flue air quantity and main exhauster rotating speed, is searched main exhauster rotating speed of target corresponding to large flue target air quantity.
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 give unnecessary details.
In other embodiment based on embodiment six, between the second computing unit 604 and the target component acquiring unit 605, also comprise following unit (not shown among Fig. 7).
The air measuring unit is 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 that whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, then indicating target parameter acquiring unit 605 is searched main exhauster rotating speed of target corresponding to large flue target air quantity, otherwise, the aperture that indicating controller 606 is regulated the bellows valve makes the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Controller in the present embodiment is compared with the controller 606 among the embodiment six, changes.
Embodiment seven
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 is used for continuously or periodically detecting the mass flow that all clothes of material distributing machine export, and namely continuously or periodically detects the inventory of all clothes outlets of material distributing machine in the unit interval.
Mass flow computation subunit 702 is used for the cumulative average that detects all cloth outlet material flows that obtain, and calculates the 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 respectively with embodiment six in 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 corresponding one by one, and function is identical, does not repeat them here.
The described system of present embodiment, by detecting continuously or periodically the inventory of all clothes outlet in the unit interval, and to all clothes outlets continuously or periodically the average of testing result add up, calculate the sintered material amount according to accumulation result.This kind mode can reduce the error of measurement by repeatedly measuring and asking the sintered material amount with the average of repeatedly measuring, and then improves the accuracy that the sintered material amount is obtained.
In addition, this scheme detects the mass flow of the cloth outlet of material distributing machine, namely detects at the place, conveying source of material, can in time obtain 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 the target component acquiring unit 706, also comprise following unit (not shown among Fig. 7).
The air measuring unit is 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 that whether described difference is more than or equal to setting threshold, if described difference is more than or equal to setting threshold, then indicating target parameter acquiring unit 706 is searched main exhauster rotating speed of target corresponding to large flue target air quantity, otherwise, the aperture that indicating controller 707 is regulated the bellows valve makes the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Embodiment eight
The embodiment of the invention is improved on embodiment six, seven basis, please refer to accompanying drawing 9, and initial parameter acquiring unit wherein comprises:
Thickness of feed layer detection sub-unit 802 is for detection of the thickness of feed layer of pallet with the relative position, exit position of material distributing machine;
Pallet speed detection sub-unit 801 is for detection of pallet speed;
Sintered material amount computation subunit 803 is used for calculating the sintered material amount, wherein, and 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 respectively with embodiment six in 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 corresponding one by one, and function is identical.
The described control system of present embodiment exports the thickness of feed layer of corresponding position by detecting pallet and the cloth of material distributing machine.The thickness of feed layer at this position can the direct reaction sintering inventory up-to-date variation, and can in time realize adjusting to subsequent module to the detection at this position, the final realization to the main exhauster frequency values more in time, regulate exactly.
In other embodiment based on embodiment eight, between the second computing unit 806 and the target component acquiring unit 807, also comprise following unit (not shown among Fig. 7).
The air measuring unit is 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 that 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, then indicating target parameter acquiring unit 807 is searched main exhauster rotating speed of target corresponding to large flue target air quantity, otherwise, the aperture that indicating controller 808 is regulated the bellows valve makes the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
Controller in the present embodiment is compared with the controller 808 among the embodiment eight, changes.
Sintered material amount described in the embodiment of the invention one to eight refers to the sintered material amount that sintering system is processed in the unit interval, 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 is ton/sky.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away 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, may further comprise the steps:
1) obtains the 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 the effective wind rate to calculate the large flue effective wind rate;
3) detect the using smoke from big gas duct composition;
4) utilize the 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 the large flue effective wind rate divided by effective wind rate;
5) utilize large flue air quantity and main exhauster rotating speed corresponding relation, search main exhauster rotating speed of target corresponding to large flue target air quantity;
6) regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue rotating speed of target.
2. method according to claim 1 is characterized in that, obtains in such a way the 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 the 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 of judging adjacent twice accumulation result in the scope of setting, if so, turns step 23); Otherwise, turn step 22).
4. method according to claim 1 is characterized in that, obtains in such a way the 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 the 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;
With the average of the smoke components of each bellows as the 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, with the smoke components average of the repeated detection smoke components as each bellows.
7. method according to claim 1 is characterized in that, also comprises between step 5) and the step 6):
71) whether the difference of judging main exhauster rotating speed of target and the current rotating speed of main exhauster if so, turns step 72 greater than setting value); Otherwise, turn step 6);
72) regulate the current frequency of main exhauster with the spacing of setting and change to main exhauster target frequency corresponding to main exhauster rotating speed of target, turn step 71).
8. according to claim 1,2,3,4,5,6 or 7 described methods, 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, then regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target air quantity, otherwise, regulate the aperture of bellows valve, make the large flue effective wind rate equal the effective wind rate of described large flue target air quantity before the bellows valve regulated.
9. sintering system main exhauster frequency-changing control system is characterized in that, comprising:
The initial parameter acquiring unit is used for obtaining the sintered material amount;
The first computing unit is used for utilizing 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 the effective wind rate to calculate the large flue effective wind rate;
The detection of exhaust gas compositions unit is for detection of sintering system using smoke from big gas duct composition;
The second computing unit is used for utilizing described using smoke from big gas duct composition to calculate effective wind rate, and, utilize large flue target air quantity to equal the large flue effective wind rate and calculate large flue target air quantity divided by effective wind rate;
The target component acquiring unit for the corresponding relation that utilizes large flue air quantity and main exhauster rotating speed, is searched main exhauster rotating speed of target corresponding to large flue target air quantity;
Controller is used for regulating the current frequency of main exhauster to main exhauster target frequency corresponding to described rotating speed of target.
10. system according to claim 9 is characterized in that, described initial parameter acquiring unit comprises:
The mass flow detection sub-unit is used for continuously or periodically detecting the mass flow that all clothes of material distributing machine export;
The mass flow computation subunit is used for the cumulative average that detects all cloth outlet material flows that obtain, and calculates the 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 |
| BR112015014193-5A BR112015014193B1 (en) | 2012-12-27 | 2013-12-26 | METHOD AND FREQUENCY CHANGE CONTROL SYSTEM OF THE MAIN EXHAUST OF A SYNTERIZATION 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 |
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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) | 2014-06-18 |
| BR112015014193A2 (en) | 2017-09-26 |
| BR112015014193B1 (en) | 2019-07-09 |
| RU2647411C2 (en) | 2018-03-15 |
| WO2014101790A1 (en) | 2014-07-03 |
| RU2015128275A (en) | 2017-02-02 |
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