CN103017532A - Method and system for variable-frequency control of main draft fan of sintering system - Google Patents
Method and system for variable-frequency control of main draft fan of sintering system Download PDFInfo
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- CN103017532A CN103017532A CN2012105789081A CN201210578908A CN103017532A CN 103017532 A CN103017532 A CN 103017532A CN 2012105789081 A CN2012105789081 A CN 2012105789081A CN 201210578908 A CN201210578908 A CN 201210578908A CN 103017532 A CN103017532 A CN 103017532A
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Abstract
The invention provides a method for variable-frequency control of a main draft fan of a sintering system. The method comprises the steps of: (11) acquiring the quantity of sintered materials and smoke components of a big flue; (12) calculating the vertical sintering speed of a material layer by using the quantity of the sintered materials and a preset sintering burn-through point, calculating the effective air quantity of the big flue by using the relationship between the vertical sintering speed and the effective air quantity, and calculating the effective air rate by using the smoke components of the big flue; (13) searching material-layer resistance corresponding to the quantity of the sintered materials in a table of corresponding relationship between the quantity of the sintered materials and the material-layer resistance; (14) calculating the target negative pressure of the big flue; (15) searching the target rotation speed of the main draft fan, corresponding to the target negative pressure of the big flue; and (16) regulating the current frequency of the main draft fan to be the target frequency corresponding to the target rotation speed of the main draft fan. The invention further provides a system for the variable-frequency control of the main draft fan of the sintering system, and the scheme can be used to reduce electric energy consumption and losses of the sintering system caused by unbalance between the power of the main draft fan and a system load.
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:
11) obtain sintered material amount and using smoke from big gas duct composition;
12) utilize sintered material amount and default sintering end point to calculate the vertical sintering speed of the bed of material, utilize the relation of vertical sintering speed and effective wind rate to calculate the large flue effective wind rate, and, utilize the using smoke from big gas duct composition to calculate effective wind rate;
13) in sintered material amount and bed of material resistance mapping table, search bed of material resistance corresponding to described sintered material amount;
14) utilize effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure, wherein, large flue target negative pressure=bed of material resistance * large flue target air quantity
2, large flue target air quantity=large flue effective wind rate/effective wind rate;
15) utilize large flue target negative pressure and main exhauster rotating speed mapping table to search main exhauster rotating speed of target corresponding to large flue target negative pressure;
16) regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target.
Sintered material amount and using smoke from big gas duct composition that the sintering system main exhauster method for controlling frequency conversion utilization that the embodiment of the invention provides is obtained, and known default sintering end point finally calculates large flue target negative pressure, and according to the current frequency of large flue target negative pressure adjusting main exhauster, realize 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 variations, can reduce that main exhauster power and load variations do not mate power consumption and the loss that causes in the sintering process, also 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.
Another embodiment based on above-mentioned control method also comprises the steps:
81) detect the current negative pressure of large flue;
82) difference of the calculating current negative pressure of large flue and large flue target negative pressure;
83) whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step 15), otherwise, execution in step 84);
84) aperture of adjusting bellows air door is so that the current negative pressure of large flue equals described large flue target negative pressure.
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 larger to systematic influence such as regulating platform vehicle speed, adjusting main exhauster frequency, the main exhausting door of adjusting etc.; 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, if when the difference of the current negative pressure of large flue and large flue target negative pressure during more than or equal to default negative pressure threshold value, then regulate the current frequency of main exhauster to main exhauster target frequency corresponding to described large flue target negative pressure, otherwise, regulate the aperture of bellows valve, so that the current negative pressure of large flue equals described large flue target negative pressure.The embodiment of the invention stabilizes to prerequisite to keep machine speed and main exhauster frequency and main exhauster air door, when negative pressure variation is larger, realize regulating target by regulating the main exhauster frequency, and in negative pressure variation hour, realize regulating target by the aperture of regulating sintering system bellows valve, and then the vertical sintering speed of realization adjusting material, thereby control more accurately sintering process to guarantee sintering end point.Can certainly regulate main exhausting 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 the sintered material amount according to following step:
41) detect continuously or periodically the mass flow that all clothes of material distributing machine export;
42) average of cumulative all cloth outlet material flows of material distributing machine;
43) utilize accumulation result to calculate the sintered material amount.
In the above-mentioned preferred version, by continuously or periodically detecting the mass flow of all cloth outlets of material distributing machine, namely detect the inventory of all cloth outlets of material distributing machine in the unit interval, then cumulative to all cloth outlets of material distributing machine average continuous or the cycle detection result, utilize accumulation result to calculate the sintered material amount.The detection error can be reduced by repeated detection and in the mode of repeated detection result's mean value computation sintered material amount, namely the accuracy of obtaining the sintered material amount can be improved.In addition, all cloth outlets detect above-mentioned preferred version to material distributing machine, namely carry the place, source to detect at sintered material, can obtain in the short period of time current more real sintered material amount data, the control lag of the current frequency of main exhauster that the hysteresis of reduction sintered material amount data acquisition causes.
On the basis of above-mentioned preferred version, step 42) and step 43) between also comprise: whether the difference of judging adjacent twice accumulation result is less than or equal to default inventory threshold value, if so, execution in step 43), otherwise, execution in step 42).Described scheme is judged repeatedly cumulative result, gets rid of the sintered material amount sudden change situation that accidentalia causes, and can obtain more accurate sintered material amount.
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 sintered material amount and using smoke from big gas duct composition;
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, utilizes the relation of vertical sintering speed and effective wind rate to calculate the large flue effective wind rate, and utilizes the using smoke from big gas duct composition to calculate effective wind rate;
First searches the unit, is used for searching bed of material resistance corresponding to described sintered material amount in sintered material amount and bed of material resistance mapping table;
The second computing unit is used for utilizing effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure, wherein, and large flue target negative pressure=bed of material resistance * large flue target air quantity
2, large flue target air quantity=large flue effective wind rate/effective wind rate;
Second searches the unit, is used for utilizing large flue negative pressure and main exhauster rotating speed mapping table to search main exhauster rotating speed of target corresponding to large flue target negative pressure;
Control module 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 described control system obtains is partly described with reference to above-mentioned control method, and this does not give unnecessary details.
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.
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 sinter quality will occur, or environmental pollution, invalid energy consume the problems such as excessive.
Embodiment one
The control method purpose that the embodiment of the invention one provides is, when the sintered material amount changes, guarantee under sinter quality (being that sintering end point 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.
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.
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., Sintering Yield 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 the main exhauster frequency according to the dynamic change adaptability 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 detected value that the means such as detection by reality obtain.
S102, obtain the using smoke from big gas duct composition.
Adopt flue gas analyzer to detect the using smoke from big gas duct composition that participates in sintering reaction.Naturally, 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 version adopts following technical scheme to detect the using smoke from big gas duct composition.
A, detect the smoke components of each bellows.
The smoke components average of b, all bellows that detection is obtained is as the using smoke from big gas duct composition.
Above-mentioned preferred version is owing to the smoke components of each bellows of direct-detection, and the flue gas in the bellows has just been participated in sintering reaction, and can react the actual sintered process, so this kind mode can improve the accuracy of using smoke from big gas duct composition detection.
Simultaneously, the smoke components average of all bellows that detection is obtained is as the using smoke from big gas duct composition, can further improve using smoke from big gas duct composition detection accuracy, reduce the smoke components sudden change of accidental, that the burst factor causes indivedual bellows to the impact of testing result.
A kind of more preferred scheme is: continuously or periodically detect the smoke components of each bellows, and the smoke components average that repeated detection is obtained is as the smoke components of each bellows.By continuously or periodically detecting the smoke components of bellows, so that main exhauster frequency and sintered material amount are more accurately mated, realize that the circulation of main exhauster frequency is regulated, can further improve the adjusting accuracy.
S103, 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.Because sintering end point presets, the sintered material amount of utilizing step S101 to obtain is calculated the vertical sintering speed of the bed of material, and utilizes the relation between vertical sintering speed and the effective wind rate to calculate the large flue effective wind rate.
Large flue effective wind rate computational process is as follows:
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 the constant situation of default sintering end point, just grilled thoroughly when material arrives 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 the vertical sintering speed of the bed of material.
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 starting point, the pallet width S
ChassisWith the sintered material density p all are known quantities, 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.
S104, the effective wind rate of calculating.
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 situation of supplies consumption oxygen 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.
S105, search bed of material resistance.
For the fixing sintering system of a size, the sintered material quantitative change, can cause thickness of feed layer and bed of material resistance to change, if raw materials for sintering mixes according to the standard proportioning, sintered material amount and bed of material resistance will form metastable corresponding relation, utilize the corresponding relation data just can form mapping table.At this moment, when learning one of them parameter, will according to the indication of this mapping table, obtain another parameter.Wherein, described mapping table can adopt repeatedly the method for sampling statistics, or the method for calculating obtains, and this repeats no more.In a further embodiment, adopt systematic survey to obtain bed of material resistance after overall drag replaces described change of production, resistance situation that more can the concentrated expression system makes system's control more accurate.
In sintered material amount and bed of material resistance mapping table, search bed of material resistance corresponding to described sintered material amount in this step.
S106, calculating large flue target negative pressure.
Utilize effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure.Concrete computational process is as follows.
Calculate large flue target air quantity Q by formula (8) and in conjunction with the sintered material amount
Target
Q
Target=Q
Have/ K (8)
Calculate large flue target negative pressure P by formula (9) and in conjunction with the sintered material amount
Target
P
Target=S*Q
Target 2(9)
Wherein, S is bed of material resistance.
S107, search the main exhauster rotating speed of target.
Utilize the corresponding relation of large flue negative pressure and main exhauster rotating speed, search main exhauster rotating speed of target corresponding to large flue target negative pressure.Above-mentioned large flue negative pressure refers to large flue at main exhauster rotating speed corresponding to different negative pressure operating modes from the corresponding relation of main exhauster rotating speed, and in practical work process, the main exhauster rotating speed by experiment, detection and statistics obtain.
S108, adjusting main exhauster frequency.
The main exhauster rotating speed of target that utilizes step S107 to obtain is regulated the current frequency of main exhauster to main exhauster target frequency corresponding to described main exhauster rotating speed of target, thereby realizes the adjusting to the main exhauster frequency.
Sintered material amount and using smoke from big gas duct composition that the sintering system main exhauster method for controlling frequency conversion utilization that the embodiment of the invention one provides is obtained, and known default terminal point finally calculates large flue target negative pressure, and according to the current frequency of large flue target negative pressure adjusting main exhauster, realize 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 variations, can reduce that main exhauster power and load variations do not mate power consumption and the loss that causes in the sintering process.
By embodiment one as can be known, 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, finally 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 above-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 opening, thereby realize the less energy-conservation adjusting of whole sintering system impact.
Specifically, between the step S106 and step S107 of embodiment one, also comprise the steps:
S1, the current negative pressure of detection large flue.
The difference of S2, the calculating current negative pressure of large flue and large flue target negative pressure.
S3, whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step S107, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve are so that the current negative pressure of large flue equals described large flue target negative pressure.
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.The target that the bellows valve opening is regulated is exactly so that the current negative pressure of large flue equals described large flue target negative pressure.
Embodiment two
Embodiment two improves on embodiment one basis.In the control method that the embodiment of the invention provides, the degree of accuracy that the sintered material amount is obtained is the key factor that affects the main exhauster regulating effect, and how improving the degree of accuracy that the sintered material amount obtains is the emphasis that those skilled in the art research and develop.
Please refer to accompanying drawing 3, the figure shows the sintering system main exhauster method for controlling frequency conversion flow process that embodiment two provides.
Flow process shown in Figure 3 comprises:
S201, detect all cloth outlet material flows.
Continuously or periodically detect the mass flow of all cloth outlets of material distributing machine, namely detect the inventory of all cloth outlets of material distributing machine in the unit interval.In this step, continuously or periodically detect the mass flow of all cloth outlets of material distributing machine, to realize all the cloth implement export continuous several times measurements to material distributing machine, for the calculating of follow-up sintering inventory.
The average of S202, cumulative all cloth outlet material flows of material distributing machine.
That is, each cloth outlet material flow that step S201 detects is averaged, then, the average of cumulative all cloth outlet material flows.
S203, utilize accumulation result to calculate the 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 multiply by setting-up time can obtain the interior sintered material amount of setting-up time.
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 inventory 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 204-210 is corresponding one by one with step S102-108 among the embodiment one, and this does not give unnecessary details.
With respect to embodiment one, the control method of the sintering system main exhauster 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, then cumulative to all cloth outlets of material distributing machine average continuous or the cycle detection result, utilize accumulation result to calculate the sintered material amount.The detection error can be reduced by repeated detection and in the mode of repeated detection result's mean value computation sintered material amount, namely the accuracy of obtaining the sintered material amount can be improved.In addition, all cloth outlets detect above-mentioned preferred version to material distributing machine, namely carry the place, source to detect at sintered material, can obtain in the short period of time current more real sintered material amount data, the control lag of the current frequency of main exhauster that the hysteresis of reduction sintered material amount data acquisition causes.
In the other embodiment based on described embodiment two, specifically, between the step S208 and S209 of embodiment two, also comprise the steps:
S1, the current negative pressure of detection large flue;
The difference of S2, the calculating current negative pressure of large flue and large flue target negative pressure;
S3, whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step S209, otherwise, execution in step S4;
S4, the aperture of regulating the bellows valve are so that the current negative pressure of large flue equals described large flue target negative pressure.
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.
Flow process shown in Figure 4 also comprises between step S302 and step S304:
Whether step S303, the difference of judging adjacent twice accumulation result are less than or equal to default inventory threshold value, if so, 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, execution in step S304; Otherwise, execution in step S302.
In the present embodiment, step S301-S302 is equivalent to the step S201-S202 among the embodiment two, and step S304 to S311 is corresponding one by one with S203 to S2010 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 all cloth outlets of material distributing machine 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 304; Otherwise, turn step 303.
In the other embodiment based on described embodiment three, specifically, between the step S309 and S310 of embodiment three, also comprise the steps:
S1, the current negative pressure of detection large flue.
The difference of S2, the calculating current negative pressure of large flue and large flue target negative pressure.
S3, whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step S310, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve are so that the current negative pressure of large flue equals described large flue target negative pressure.
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, default sintering end point is known apart from N to the sintering starting point, the pallet width S
ChassisAll known with the sintered material density p, so by detecting thickness of feed layer H
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 S409 is corresponding one by one with S102 to S108 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 adjusting of main exhauster frequency more in time, accurately.
In the other embodiment based on described embodiment four, specifically, between the step S407 and S408 of embodiment four, also comprise the steps:
S1, the current negative pressure of detection large flue.
The difference of S2, the calculating current negative pressure of large flue and large flue target negative pressure.
S3, whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step S408, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve are so that the current negative pressure of large flue equals described large flue target negative pressure.
Embodiment five
Please refer to accompanying drawing 6, Fig. 6 shows the control method flow process that the embodiment of the invention five provides.
In the flow process shown in Figure 6, step S508 is achieved as follows to step S511:
S508, obtain the current rotating speed a of main exhauster;
S509, judge main exhauster rotating speed of target b and the current rotating speed a of main exhauster difference whether greater than the preset rotation speed threshold value, if so, execution in step S511; Otherwise, execution in step S510.
S510, the current frequency of adjusting main exhauster are to main exhauster target frequency corresponding to main exhauster rotating speed of target.
S511, setting spacing are regulated the main exhauster frequency and are changed execution in step S509 to the main exhauster target frequency.
In the control method that embodiment five provides, when the difference of main exhauster rotating speed of target and the current rotating speed of main exhauster during greater than the preset rotation speed threshold value, according to setting spacing the current frequency of main exhauster is regulated, for example take 1 hertz as a spacing, until the difference of the main exhauster frequency after regulating and main exhauster target frequency is less than described preset rotation speed threshold value, the main exhauster frequency adjustment after directly will regulating at last arrives 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.The control method that embodiment five provides is avoided the significant adjusting of main exhauster power as far as possible, can guarantee the stationarity of equipment, prolongs the life-span of each equipment of sintering system.
Among the embodiment five, step S501 is corresponding one by one to step S107 with step S101 to step S507, and this does not give unnecessary details.
In the other embodiment based on described embodiment five, specifically, between the step S506 and S507 of embodiment five, also comprise the steps:
S1, the current negative pressure of detection large flue.
The difference of S2, the calculating current negative pressure of large flue and large flue target negative pressure.
S3, whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step S507, otherwise, execution in step S4.
S4, the aperture of regulating the bellows valve are so that the current negative pressure of large flue equals described large flue target negative pressure.
Embodiment six
Based on above-described embodiment one, embodiment six provides a kind of sintering system main exhauster frequency-changing control system.Please refer to accompanying drawing 7, the figure shows the structure of the sintering system main exhauster frequency-changing control system that embodiment six provides.
System shown in Figure 7 comprises:
Initial parameter acquiring unit 601 is used for obtaining sintered material amount and using smoke from big gas duct composition; Described sintered material amount can be according to the predefined value of output plan, also can be the detected value that obtains by means such as detections.Adopt flue gas analyzer to detect the using smoke from big gas duct composition that participates in sintering reaction.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 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, utilizes the relation of vertical sintering speed and effective wind rate to calculate the large flue effective wind rate, and utilizes the using smoke from big gas duct composition to calculate effective wind rate;
For the fixing sintering system of a size, the sintered material quantitative change, can cause thickness of feed layer and bed of material resistance to change, if raw materials for sintering mixes according to the standard proportioning, sintered material amount and bed of material resistance will form metastable corresponding relation, utilize the corresponding relation data just can form mapping table.At this moment, when learning one of them parameter, will according to the indication of this mapping table, obtain another parameter.Wherein, described mapping table can adopt repeatedly the method for sampling statistics, or the method for calculating obtains, and this repeats no more.In a further embodiment, adopt systematic survey to obtain bed of material resistance after overall drag replaces described change of production, resistance situation that more can the concentrated expression system makes system's control more accurate.
In sintered material amount and bed of material resistance mapping table, search bed of material resistance corresponding to described sintered material amount in this step.
The second computing unit 604 is used for utilizing effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure, wherein, and large flue target negative pressure=bed of material resistance * large flue target air quantity
2, large flue target air quantity=large flue effective wind rate/effective wind rate.
Utilize effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure.Concrete computational process is as follows.
Calculate large flue target air quantity Q by formula (8) and in conjunction with the sintered material amount
Target
Q
Target=Q
Have/ E/K (8)
Calculate large flue target negative pressure P by formula (9) and in conjunction with the sintered material amount
Target
P
Target=SQ
Target 2(9)
Wherein, S is bed of material resistance.
Utilize the corresponding relation of large flue negative pressure and main exhauster rotating speed, search main exhauster rotating speed of target corresponding to large flue target negative pressure.Above-mentioned large flue negative pressure refers to large flue at main exhauster rotating speed corresponding to different negative pressure operating modes from the corresponding relation of main exhauster rotating speed, and in practical work process, the main exhauster rotating speed by experiment, detection and statistics obtain.
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, the second computing unit 604 and second is searched between the unit 605, also comprises following unit (not shown among Fig. 7):
The negative pressure measuring unit is for detection of the current negative pressure of large flue.
Judging unit, calculate the difference of the current negative pressure of large flue and large flue target negative pressure, and, judge that whether described difference is more than or equal to default negative pressure threshold value, if described difference more than or equal to default negative pressure threshold value, then indicates second to search the unit and search main exhauster rotating speed of target corresponding to large flue target negative pressure, otherwise, the aperture that the indication control module is regulated the bellows valve is so that the current negative pressure of large flue equals described large flue target negative pressure.
Control module in the present embodiment is compared with the control module 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 701 wherein comprises:
Mass flow detection sub-unit 7011 is used for continuously or periodically detecting the mass flow that all clothes of material distributing machine export;
Mass flow computation subunit 7012 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.
The described system of present embodiment, by detecting continuously or periodically the mass flow of all clothes outlet, 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 is measured the inventory of the cloth outlet 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 other embodiment based on embodiment seven, the second computing unit 704 and second is searched between the unit 705, also comprises 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 negative pressure of large flue and large flue target negative pressure, and, judge that whether described difference is more than or equal to default negative pressure threshold value, if described difference more than or equal to default negative pressure threshold value, then indicates second to search the unit and search main exhauster rotating speed of target corresponding to large flue target negative pressure, otherwise, the aperture that the indication control module is regulated the bellows valve is so that the current negative pressure of large flue equals described large flue target negative pressure.Control module in the present embodiment is compared with the control module 706 among the embodiment seven, changes.
The first computing unit 702, first in the present embodiment search unit 703, the second computing unit 704, second search unit 705 and control module 706 respectively with embodiment six in the first computing unit 602, first search unit 603, the second computing unit 604, second searches unit 605 and control module 606 is corresponding one by one, and function is identical, specifically please refer to embodiment six, this does not give unnecessary details.
Sintered material amount described in the embodiment of the invention one to seven refers to the sintered material amount that sintering system is processed in the unit interval, and its unit is the ton/time.Can be the sintered material amount of sintering system processing hourly, unit be ton/hour; Also can be the sintered material amount of processing every day, its unit be 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 comprising:
11) obtain sintered material amount and using smoke from big gas duct composition;
12) utilize sintered material amount and default sintering end point to calculate the vertical sintering speed of the bed of material, utilize the relation of vertical sintering speed and effective wind rate to calculate the large flue effective wind rate, and, utilize the using smoke from big gas duct composition to calculate effective wind rate;
13) in sintered material amount and bed of material resistance mapping table, search bed of material resistance corresponding to described sintered material amount;
14) utilize effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure, wherein, large flue target negative pressure=bed of material resistance * large flue target air quantity
2, large flue target air quantity=large flue effective wind rate/effective wind rate;
15) utilize large flue target negative pressure and main exhauster rotating speed mapping table to search main exhauster rotating speed of target corresponding to large flue target negative pressure;
16) 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:
21) detect the smoke components of each bellows;
The smoke components average of all bellows that 22) detection obtained is as the using smoke from big gas duct composition.
3. method according to claim 2 is characterized in that:
Continuously or periodically detect the smoke components of each bellows, the average of the smoke components that repeated detection is obtained is as the smoke components of each bellows.
4. method according to claim 1 is characterized in that, obtains the sintered material amount according to following step:
41) detect continuously or periodically the mass flow that all clothes of material distributing machine export;
42) average of cumulative all cloth outlet material flows of material distributing machine;
43) utilize accumulation result to calculate the sintered material amount.
5. method according to claim 4 is characterized in that step 42) and step 43) between also comprise:
Whether the difference of judging adjacent twice accumulation result is less than or equal to default inventory threshold value, if so, and execution in step 43), otherwise, execution in step 42).
6. method according to claim 1 is characterized in that, obtains the sintered material amount according to following step:
61) detect the thickness of feed layer that pallet speed and pallet and material distributing machine cloth export corresponding position;
62) calculate the sintered material amount, wherein, sintered material amount=pallet width * pallet speed * sintered material density * thickness of feed layer.
7. method according to claim 1 is characterized in that:
71) obtain the current rotating speed of main exhauster;
Whether the difference of 72) judging the current rotating speed of main exhauster rotating speed of target and main exhauster greater than the preset rotation speed threshold value, if so, and execution in step 73), otherwise, execution in step 16);
73) regulate the current frequency of main exhauster to the variation of main exhauster target frequency, execution in step 72 to set spacing).
8. the described method of any one according to claim 1-7 characterized by further comprising:
81) detect the current negative pressure of large flue;
82) difference of the calculating current negative pressure of large flue and large flue target negative pressure;
83) whether judge described difference more than or equal to default negative pressure threshold value, if so, execution in step 15), otherwise, execution in step 84);
84) aperture of adjusting bellows valve is so that the current negative pressure of large flue equals described large flue target negative pressure.
9. sintering system main exhauster frequency-changing control system is characterized in that comprising:
The initial parameter acquiring unit is used for obtaining sintered material amount and using smoke from big gas duct composition;
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, utilizes the relation of vertical sintering speed and effective wind rate to calculate the large flue effective wind rate, and utilizes the using smoke from big gas duct composition to calculate effective wind rate;
First searches the unit, is used for searching bed of material resistance corresponding to described sintered material amount in sintered material amount and bed of material resistance mapping table;
The second computing unit is used for utilizing effective wind rate, large flue effective wind rate and bed of material resistance to calculate large flue target negative pressure, wherein, and large flue target negative pressure=bed of material resistance * large flue target air quantity
2, large flue target air quantity=large flue effective wind rate/effective wind rate;
Second searches the unit, is used for utilizing large flue negative pressure and main exhauster rotating speed mapping table to search main exhauster rotating speed of target corresponding to large flue target negative pressure;
Control module is used 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:
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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