CN103033049B - Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine - Google Patents
Negative pressure control method and negative pressure control system for main exhaust fan of sintering machine Download PDFInfo
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- CN103033049B CN103033049B CN201210578939.7A CN201210578939A CN103033049B CN 103033049 B CN103033049 B CN 103033049B CN 201210578939 A CN201210578939 A CN 201210578939A CN 103033049 B CN103033049 B CN 103033049B
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Abstract
The application discloses a negative pressure control method and a negative pressure control system for a main exhaust fan of a sintering machine. The method includes the following steps: the thickness of the material on a sintering pallet is measured, the vertical sintering speed of the material is calculated, and the effective air volume of each bellows is determined; the flue gas components of a large flue are detected; according to the detected flue gas components, the effective air rate of each bellows is calculated; material resistance corresponding to the material thickness is queried; target large flue negative pressure is calculated; the target large flue negative pressure as a regulating parameter is sent to a main exhaust fan controller, the main exhaust fan controller regulates the frequency of the main exhaust fan to change toward target frequency, and the target frequency is equal to the frequency corresponding to the target large flue negative pressure. After material thickness is changed, the negative pressure of the main exhaust fan can be automatically and accurately regulated to match with the current material thickness, and under the premise of guaranteeing sintering quality, the energy consumption of the main exhaust fan can be reduced in the process of sintering.
Description
Technical field
The application relates to SINTERING TECHNOLOGY field, particularly relates to a kind of sintering machine main air exhauster negative pressure control method and system.
Background technology
Along with developing rapidly of modern industry, iron and steel production scale is increasing, and energy resource consumption also gets more and more, and energy-conserving and environment-protective index more and more becomes the important investigation factor of steel manufacture process.In iron and steel is produced, iron-bearing material ore needs before entering blast furnace process through sintering system process, namely, by various powdery iron-containing raw material, appropriate fuel and flux is allocated into, add appropriate water, after mixing and pelletizing, cloth is placed on roasting on pallet, makes it that series of physical chemical change occur, form the sintering deposit easily smelted, this process is referred to as sintering.
Sintering system mainly comprises multiple equipment such as pallet, mixer, main exhauster, central cooler, its total technological process is shown in Figure 1: various raw material is in proportioning room 1 proportioning, form mixed material, then enter mixer 2 to mix and pelletizing, again by round roller batcher 3 and nine roller material distributing machine 4 by its uniformly dispersing formation bed of material on pallet 5, igniting blower fan 12 and blower fan 11 of igniting are for material igniting beginning sintering process.The sintering deposit obtained after having sintered enters central cooler 9 and cools after single roll crusher 8 fragmentation, delivers to blast furnace or finished product ore storage bin finally by after the whole grain of screening.Wherein, the oxygen that sintering process needs is provided by main exhauster 10, multiple vertical bellows 6 are side by side provided with below pallet 5, it is the large flue (or claiming flue) 7 of horizontal setting below bellows, large flue 7 is connected with main exhauster 10, main exhauster 10 passes through the negative pressure wind of large flue 7 and bellows 6 generation through chassis, for sintering process provides combustion air.
In order to ensure sintering quality, usually at initial stage of sintering, thickness material bed on the speed of pallet and pallet is regulated, make sintering end point can the fixed position pre-set (being generally second-to-last bellows on pallet), and once after determining sintering end point, speed and the thickness of feed layer of pallet are just determined.But in actual production process, thickness of feed layer may change, such as, due to the impact of the memory space factor etc. of the market factor, raw material memory space factor and sintering deposit, need regulate Sintering Yield and then regulate sinter doses, thus affect the thickness of feed layer on chassis, or, due to material distributing machine fault or other non-regulated reasons, the thickness of feed layer on chassis also can be caused to occur change.Like this, sintering end point will depart from fixed position, cannot ensure sintering quality preferably.
For adapting to different sintering process, in existing sintering process, the main exhauster of sintering machine system operates according to maximum design power, and this must cause too high power consumption and loss.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of sintering machine main air exhauster negative pressure control method and system, to reduce the energy consumption of main exhauster in sintering process.
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of sintering machine main air exhauster negative pressure control method, comprising:
Measure the thickness of feed layer of material on pallet, known machine speed, known sintering end point and described thickness of feed layer is utilized to calculate the vertical sintering speed of material, and, utilize the relation between effective wind rate and vertical sintering speed to determine the effective wind rate of each bellows;
Detect the smoke components of large flue;
Calculating according to detecting the smoke components obtained, utilizing
calculate the amount of oxygen participating in reaction, and utilize
effective wind rate of each bellows;
In the mapping table of known thickness of feed layer and materialbeds comminution, search the materialbeds comminution corresponding with described thickness of feed layer;
Calculate large flue target negative pressure;
Large flue target negative pressure=materialbeds comminution * (large flue air quantity)
2,
Described large flue target negative pressure is sent to main exhauster controller as regulating parameter, and described main exhauster controller regulates the frequency of main exhauster to change to target frequency, and described target frequency equals the frequency corresponding to large flue target negative pressure.
Based in another embodiment of said method, also comprise the steps:
Detect the current negative pressure of large flue;
Calculate the difference of the current negative pressure of large flue and large flue target negative pressure;
If described difference is more than or equal to the threshold value of setting, then described large flue target negative pressure is sent to main exhauster controller as regulating parameter, otherwise, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, makes the effective wind rate that large flue effective wind rate equals corresponding before valve regulated with described large flue target negative pressure.
Present invention also offers a kind of sintering machine main air exhauster vacuum control system, comprising:
Bed of material measuring unit, for measuring the thickness of feed layer of material on pallet;
Vertical sintering speed computing unit, for the vertical sintering speed utilizing known machine speed, known sintering end point and described thickness of feed layer to calculate material;
Effective wind rate determining unit, for the effective wind rate utilizing the relation between effective wind rate and vertical sintering speed to determine each bellows;
Detection of exhaust gas compositions unit, for detecting the smoke components in large flue;
Effective wind rate computing unit, for calculating according to described smoke components, utilizes
calculate the amount of oxygen participating in reaction, and utilize
effective wind rate of each bellows;
Search unit, in the mapping table of known thickness of feed layer and materialbeds comminution, search the materialbeds comminution corresponding with described thickness of feed layer;
Negative pressure computing unit, for calculating large flue target negative pressure;
Large flue target negative pressure=materialbeds comminution * (large flue air quantity)
2,
Control unit, for large flue target negative pressure is sent to main exhauster controller as regulating parameter, described controller regulates the frequency of main exhauster to change to target frequency, and described target frequency equals the frequency corresponding to large flue target negative pressure.
From above technical scheme, this main exhauster negative pressure control method that the embodiment of the present application provides, for the sintering pallet that machine speed, sintering end point have set, by detecting the thickness of feed layer on chassis, determine the effective wind rate with each bellows corresponding to thickness of feed layer, when sintering, by detecting the smoke components of current sintering machine large flue, can calculate effective wind rate of current each bellows, effectively wind rate refers in sintering process the ratio shared by the effective wind rate participating in sintering reaction here.Large flue target negative pressure is calculated according to effective wind rate and effective wind rate, and this large flue target negative pressure is sent to main exhauster controller, main exhauster controller just can regulate the frequency of main induced draft fans to change to target frequency, and target frequency equals the frequency corresponding to large flue target negative pressure here.
Compared with prior art, the method that the embodiment of the present application provides, whatsoever reason causes thickness of feed layer to change, only need know current thickness of feed layer, automatically can be adjusted to, exactly by the negative pressure of main exhauster and match with current thickness of feed layer, realize, under the prerequisite ensureing sintering quality, reducing the energy consumption of main exhauster in sintering process.The method that the embodiment of the present invention provides, often produce one ton of sintering deposit product, electric energy can be realized and save 15%, if the embodiment of the present invention to be applied to the control of 180 square metres of sintering machines, with do not adopt compared with the solution of the present invention, the Spring Festival holidays economize electric energy about 1,080 ten thousand degree, if the embodiment of the present invention to be applied to the control of 360 square metres of sintering machines, with do not adopt compared with the solution of the present invention, the Spring Festival holidays economize electric energy about 2,160 ten thousand degree, can bring many economic and social benefits such as monetary savings, decreasing pollution discharge.
Of particular note, have the equipment that is much mutually related in sintering system, comparatively speaking, equipment associated with more miscellaneous equipment, can be called system equipment, as pallet, main exhauster etc.; And equipment associated with less equipment, then can be called local devices, as the air door etc. of bellows, bellows.Obviously, regulating system equipment, as regulating platform vehicle speed, regulates and main takes out frequency, regulates main exhausting door etc. larger to systematic influence; And regulate local devices, then less on the impact of system.Therefore, in sintering system, by local devices, but not by the adjustment of system equipment, system is exerted one's influence, be conducive to system stability and extension device life-span.Therefore, in the embodiment of the present invention, only have when the difference of the current negative pressure of large flue and large flue target negative pressure is more than or equal to the threshold value of setting, described large flue target negative pressure is sent to main exhauster controller as regulating parameter, the frequency of main exhauster is regulated to change to target frequency by described main exhauster controller, otherwise, when the difference of the current negative pressure of large flue and large flue target negative pressure is less than or equal to the threshold value of setting, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, large flue effective wind rate is made to equal the effective wind rate of described large flue target negative pressure before valve regulated.The embodiment of the present invention stabilizes to prerequisite to maintain machine speed and main exhauster frequency and main exhauster air door, when negative pressure variation is larger, realize by regulating main exhauster frequency regulating target, and when negative pressure variation is less, realize regulating target by regulating the aperture of sintering bellows valve, and then realize the vertical speed regulating material sintering, thus more accurate control sintering process and sintering end point.Visible, embodiments provide a kind of regulative mode being conducive to system stability.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing sintering machine;
The flow chart of the sintering machine main air exhauster negative pressure control method that Fig. 2 provides for the embodiment of the present application one;
The flow chart of the sintering machine main air exhauster negative pressure control method that Fig. 3 provides for the embodiment of the present application two;
The flow chart of the sintering machine main air exhauster negative pressure control method that Fig. 4 provides for the embodiment of the present application three;
The structural representation of the sintering machine main air exhauster vacuum control system that Fig. 5 provides for the embodiment of the present application four;
The structural representation of the sintering machine main air exhauster vacuum control system that Fig. 6 provides for the embodiment of the present application five;
The structural representation of the sintering machine main air exhauster vacuum control system that Fig. 7 provides for the embodiment of the present application six.
Detailed description of the invention
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
In sintering system, load is usually expressed as various ways, and e.g., inventory, thickness of feed layer, even due to the relevance of equipment, an equipment may be the load of another associate device, and such as machine speed may be just the load of main exhauster.In reality, have a lot of reasons, as equipment fault, design change, cause load to change or fluctuation, thus change or affect the balance of sintering system and stablize, now, just need the duty of change system relevant device, that is, carry out system fading margin, otherwise just there will be Sintering Yield can not ensure, or the problem such as environmental pollution, invalid energy ezpenditure be excessive.
Embodiment one:
The flow chart of the main exhauster negative pressure control method that Fig. 2 provides for the embodiment of the present application one.
As shown in Figure 2, the method comprises:
S201: the thickness of feed layer measuring material on pallet.
In the present embodiment, the method for direct-detection can be adopted to measure the thickness of feed layer of material, also the discharge quantity of indirect detection material distributing machine unit interval can calculate the thickness of feed layer of material.Because the bed of material on sintering pallet is in sintering process, from sintering starting point to sintering end point, usually need 40 minutes even more, this causes when detecting thickness of feed layer, and the closer to sintering end point, the time-lag effect starting to regulate is larger.Therefore, in an embodiment, when adopting the method for direct-detection to measure thickness of feed layer, thickness of feed layer direct-detection sintering pallet being positioned at material below material distributing machine can be selected.
In addition, the inventory of sintering machine can being obtained, then according to known machine speed, utilizing formula (1) to calculate the thickness of feed layer calculated value h corresponding with inventory being detected
the bed of material.
E=S
chassis* h
the bed of material* V
chassis* ρ/1000 (1)
Wherein: E is the sinter doses of unit interval, and unit is t/min; S
chassisbe pallet width, unit is m; h
the bed of materialbe thickness of feed layer, unit is mm; V
chassispallet speed, m/min; ρ is sintering deposit density t/m
3.For the sintering machine of specific material, chassis width and material density are certain.
Because the adjustable range of thickness of feed layer is generally 660 ~ 750, and consider thickness of feed layer degree of regulation problem, during practical adjustments, thickness of feed layer is divided into multiple level of thickness, as shown in table 1, level of thickness is 10.When calculating thickness of feed layer h according to inventory
the bed of materialafter, by this thickness of feed layer h
the bed of materialcorresponding level of thickness is as final thickness of feed layer H
the bed of material.
Table 1:
So just can accomplish when actual production after instrumentality doses, the thickness of feed layer H corresponding with this inventory can be obtained according to inventory in time.
S202: the vertical sintering speed calculating material.
After thickness of feed layer being detected, the machine speed that coupling system prestores, chassis length parameter, utilize formula (3) can calculate material bed vertical sintering speed.
V
hang down=H
the bed of material/ (L/V
chassis)=(H
the bed of material* V
chassis)/L (2)
Wherein, V
hang downfor vertical sintering speed (mm/min), H
the bed of materialfor thickness of feed layer (mm), L is known sintering end point (m), V
chassisfor machine speed (m/min).
S203: the effective wind rate calculating each bellows.
In sintering process, effective wind rate refers to and participates in the air quantity shared by oxygen of sintering reaction, when the effective wind rate under known standard state needed for material thorough roasting, utilizes formula (3) just can obtain the effective wind rate of each bellows under standard state.
Q
there is mark=V
hang down* Q
t marks(3)
Wherein, Q
there is markfor the effective wind rate of bellows each under standard state, Q
t marksfor the effective wind rate that material roasting under standard state is fully required.
S204: the smoke components detecting large flue.
In material bed sintering process, the oxygen in the air quantity that main exhauster can not be produced is completely consumed, but only some oxygen participates in sintering reaction, so, the oxygen situation of supplies consumption in sintering process can be understood by smoke components.In the present embodiment, detect using smoke from big gas duct composition, O in main detection unit volume flue gas
2, CO, CO
2, N
2, NO, NO
2content.
S205: according to the effective wind rate detecting the smoke components that obtains and calculate each bellows.
Because air enters in sintering reaction process, oxygen need participate in the reaction such as iron ore solid phase reaction and coke burning, and the oxygen therefore in air inlet is after sintering process, and the amount of its oxygen in flue gas can change; Because nitrogen does not participate in the solid phase reaction of iron ore, thus nitrogen after sintering process with NO, NO
2, N
2form exist, can Measurement accuracy in flue gas.
According to the constant law of material, the stable content of nitrogen and oxygen in air, like this according to nitrogen in flue gas amount and oxidized nitrogen amount, just can calculate the amount entering into nitrogen in large flue and oxygen, simultaneously according to remaining oxygen amount in the flue gas recorded, utilize formula (4) accurately to calculate and participate in reaction amount of oxygen.
Wherein:
In air, in amount of oxygen/air, nitrogen amount is a constant; Oxidized nitrogen amount can by NO, the NO detected in flue gas analyzer
2amount calculates; Nitrogen in flue gas amount also can by detecting the N obtained in flue gas analyzer
2amount calculates.
Therefore, participation reaction amount of oxygen can be calculated.
After calculating participation reaction amount of oxygen, utilize formula (5), the effective wind rate K of large flue can be calculated.
Wherein: K is the effective wind rate of large flue, in flue gas, remaining oxygen amount can by detecting the O obtained in flue gas analyzer
2amount calculates.
By the fume component analysis to large flue, effective wind rate of current each bellows can be calculated.
In the present embodiment, using the smoke components of the smoke components of large flue as each bellows, be in fact the average obtaining each bellows smoke components, thus the uncertainty impact that the physical characteristic difference reducing each bellows is brought, as leaked out, bellows resistance etc.Therefore, in a further embodiment, also can detect the smoke components of each bellows, calculate effective wind rate of each bellows according to this, because this mode requires that the flue gas inspection instrument quantity used is more, make system have more complexity, cost is also higher.
In addition, after step S204 can not limit and be positioned at step S203 as shown in Figure 1, and can also carry out with step S201 simultaneously, and after step S203 and step S205, step S206 can be performed.
S206: search materialbeds comminution.
When thickness of feed layer is equal, the material of different ratio, corresponding materialbeds comminution is different.And the material of identical proportioning, when thickness of feed layer is unequal, corresponding materialbeds comminution is not identical yet.So for the material of different ratio, set up the relation table of materialbeds comminution corresponding to Different layer of the compost thickness in advance by experiment, to facilitate while actually employed, corresponding materialbeds comminution can be found fast from the relation table set up in advance according to the proportioning of material, thickness of feed layer.
S207: calculate large flue target negative pressure.
By formula (6), large flue target negative pressure P can be calculated
large flue..
P
large flue=S*Q
large flue 2(6)
Due to large flue air quantity Q
large flueequal the air quantity Q of all bellows
isum, so when after the air quantity calculating each bellows, utilizes formula (7), can calculate large flue air quantity Q
large flue.
Wherein, 20 is the numbers of bellows on sintering machine in this example, Q
iit is the air quantity of i-th bellows.
And for each bellows, the air quantity Q of bellows
ican calculate according to formula (8).
Q
i=Q
there is mark/ K (8)
S208: large flue target negative pressure is sent to main exhauster controller as regulating parameter.
By above-mentioned steps, one can be obtained for regulating the regulating parameter P of main exhauster
large flueand this regulating parameter is sent to main exhauster controller, the frequency of main exhauster is regulated to change to target frequency by described main exhauster controller according to " frequency relation of target negative pressure parameter and main exhauster ", described target frequency equals the frequency values corresponding to large flue target negative pressure, to realize the air force controlling main exhauster.
In addition, when large flue exist leak out time, the negative pressure of main exhauster equals large flue target negative pressure and pipeline and to leak out negative pressure sum, and now, the negative pressure sum that needs large flue target negative pressure and pipeline to leak out sends to main exhauster controller as regulating parameter.Pipeline leaks out and also to change when negative pressure variation is little little, and in actual applications, pipeline negative pressure of leaking out can obtain in advance by experiment.
According to embodiment one, as long as change as the thickness of feed layer of load, all need the frequency regulating main exhauster, the power consumption of main exhauster and the change of load are adapted, thus realizes energy-conservation.But main exhauster, as system equipment, can have a negative impact to the stability of whole sintering system to its adjustment.Therefore, other embodiment based on described embodiment one provides an improved plan, the program, in load, when namely thickness of feed layer changes greatly, regulates main exhauster, and when load change is less, regulate the valve opening of bellows, like this adjustment of main exhauster and the adjustment of valve opening are combined, when load change is less, reach the effect of main exhauster frequency adjustment with the adjustment of valve opening, thus realize the energy-conservation regulation scheme less on whole sintering system impact.
Specifically, (not shown in figure 1) between the step S206 and step S207 of embodiment one, also comprises 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, judge whether described difference is more than or equal to the threshold value of setting, if described difference is more than or equal to the threshold value of setting, then perform S207, otherwise, perform step S4;
S4, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, makes the effective wind rate that large flue effective wind rate equals corresponding before valve regulated with described large flue target negative pressure.
In sintering system, the validity of negative pressure reduces along with the increase of negative pressure, otherwise increases along with the minimizing of negative pressure.Such as, materialbeds comminution along with the sintering process duration longer and more and more less, the reduction of materialbeds comminution makes by the air quantity of the bed of material increasing, the effective wind (oxygen namely contained in wind) participating in sintering is then fewer and feweri, corresponding negative pressure validity is also just more and more less, now, by regulating bellows valve opening (closedown), suitable increase bellows negative pressure, is just conducive to air quantity of remaining valid.
The effect of step S3 is, judge the change size of load, to determine to regulate main exhauster or controlling opening of valve, determine the selection of regulating measure in other words, so that when load change is little, by replacing the adjustment to main exhauster to the adjustment of valve, thus make adjustment little as far as possible on the impact of sintering system.
The effect of step S4 is, determines that the aperture of valve becomes and still diminishes greatly.When obtaining large flue target negative pressure, the effective wind rate that the change of load needs system and provides described large flue target negative pressure corresponding is described, this effective wind rate is before valve regulated, namely can calculate under current valve state, therefore, the target that valve opening regulates, makes the effective wind rate that large flue effective wind rate equals corresponding before valve regulated with described large flue target negative pressure exactly.Wherein, large flue effective wind rate can by detecting the large flue target negative pressure that obtain and effective wind rate calculates.In view of those skilled in the art can realize the program according to the instruction of the present embodiment, do not repeat them here.
Embodiment two:
The flow chart of the main exhauster negative pressure control method that Fig. 3 provides for embodiment two.
Shown in Fig. 3, step S301 ~ S303 is equivalent to step S201 ~ S203 in embodiment one, about step S301 ~ S303 detailed description can see in above-described embodiment one to the description of step S201 ~ S203, do not repeat them here.
S304: detect the smoke components in large flue in unit volume flue gas according to the time interval pre-set.
Here, in the present embodiment, the smoke components in large flue in unit volume flue gas is O in unit volume flue gas
2, CO, CO
2, N
2, NO, NO
2content.When detecting using smoke from big gas duct composition, detecting using smoke from big gas duct composition according to time interval of pre-setting, the change of detection more adaptive system load can be made.Such as, work as system load, time as unstable in thickness of feed layer, select the shorter time interval, as 1 second or 0.5 second, and when system load is comparatively stablized, select the longer time interval, as 10 seconds or 20 seconds, the adjustment of main exhauster so both can have been made to be unlikely to too frequent and influential system stable, the smoke components change in sintering machine large flue can be understood again in time, regulate main exhauster in time.
In the present embodiment, the described time interval according to pre-setting detects the smoke components in large flue in unit volume flue gas, refer to after collecting described smoke components, start subsequent step S305 according to time interval of pre-setting, instead of often collect a smoke components and just start subsequent step S305 immediately.
Therefore, dynamic adjustments interval detection time can realize like this: gather described smoke components with the less time interval, if the difference of the collection value of adjacent twice is less than the value of setting, such as 5% (this setting value is when system, determined by parameters such as the degree of regulation of main exhauster and the stabilities of a system, this does not repeat), then select the longer time interval, as 10 seconds or 20 seconds, start subsequent step S305, otherwise, select the shorter time interval, as 1 second or 0.5 second, start subsequent step S305.In other example, start the time interval of subsequent step S305, depend on the amplitude of the difference of the collection value of adjacent twice, described amplitude is larger, and the time interval starting subsequent step S305 is shorter, otherwise the time interval starting subsequent step S305 is longer.In view of determining time-interval system like this and easily realizing, do not repeat them here.
S305: utilize described smoke components to determine to participate in reaction amount of oxygen, and determine to obtain the difference of participation reaction amount of oxygen after calculating adjacent twice detection smoke components.
S306: whether the difference judging to participate in reaction amount of oxygen is greater than pre-sets value.
When judged result is for being greater than, perform step S307; Otherwise perform step S308.
S307: utilize current detection result to calculate effective wind rate of each bellows.
When the difference of adjacent twice testing result be greater than pre-set value time, then represent current system unstable working condition, need to utilize the up-to-date smoke components detected as the air quantity regulated according to removing to regulate main exhauster, so, in this step, current detection result (i.e. the up-to-date smoke components data of large flue) is utilized to go to calculate effective wind rate of each bellows.Step S309 is performed after this step.
S308: determine the effective wind rate obtaining each bellows of mean value computation participating in reaction amount of oxygen after detecting smoke components according to adjacent twice.
When the difference of adjacent twice testing result be less than or equal to pre-set value time, mean that current system duty is relatively stable.In addition, in order to avoid certain metrical error is on the impact of sintering process, the average of adjacent twice testing result is adopted, as the foundation of subsequent calculations large flue target negative pressure.Step S309 is performed after this step.
S309: calculate large flue target negative pressure.
S310: large flue target negative pressure is sent to main exhauster controller as regulating parameter.
In the embodiment of the present application, step S206 ~ S207 one_to_one corresponding in step S309 ~ S310 and embodiment one, describe in detail can with reference in above-described embodiment about the description of step S206 ~ S207, do not repeat them here.
In the other embodiment based on described embodiment two, specifically, between the step S309 and step S310 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, judge whether described difference is more than or equal to the threshold value of setting, if described difference is more than or equal to the threshold value of setting, then perform S310, otherwise, perform step S4;
S4, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target negative pressure before valve regulated.
Embodiment three:
The present embodiment is with reference to flow process shown in figure 4.Shown in Fig. 4, step S401 ~ S406 is equivalent to step S201 ~ S206 in embodiment one, about step S401 ~ S406 detailed description can see in above-described embodiment one to the description of step S201 ~ S206, do not repeat them here.
S407: the difference calculating the large flue target negative pressure that twice adjacent calculation obtains.
S408: judge whether described difference is greater than the value pre-set.
When judged result is for being greater than, perform step S409; Otherwise perform step S410.
S409: using the current large flue target negative pressure calculated as regulating parameter.
S410: the average of large flue target negative pressure twice adjacent calculation obtained is as regulating parameter.
S411: regulating parameter is sent to main exhauster controller.
When the large flue target negative pressure that twice adjacent calculation obtains be greater than pre-set value time, represent current system unstable working condition, at this moment will utilize latest computed to large flue target negative pressure remove to regulate the air quantity of main exhauster.
When the large flue target negative pressure that twice adjacent calculation obtains be less than or equal to pre-set value time, mean that current system duty is relatively stable, for avoiding certain metrical error on the impact of sintering process, twice adjacent calculation is adopted to obtain the average of large flue target negative pressure to control the frequency of main exhauster, to keep the air quantity of main exhauster comparatively constant.
In the other embodiment based on described embodiment three, specifically, after the judgement of the step S408 of embodiment three completes, before step S411, 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, judge whether described difference is more than or equal to the threshold value of setting, if described difference is more than or equal to the threshold value of setting, then perform S411, otherwise, perform step S4;
S4, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target negative pressure before valve regulated.
Embodiment four:
The present embodiment provides a kind of sintering machine main air exhauster vacuum control system.
As shown in Figure 5, this system comprises: bed of material measuring unit 51, vertical sintering speed computing unit 52, effective wind rate determining unit 53, detection of exhaust gas compositions unit 54, effectively wind rate computing unit 55, search unit 56, negative pressure computing unit 57 and control unit 58, wherein
Bed of material measuring unit 51, for measuring the thickness of feed layer of material on pallet.When measuring, utilizing and arranging detection probe below sintering pallet material distributing machine, bed of material measuring unit 51 controls the data that detection probe detects.In addition, bed of material measuring unit 51 can also be connected with the control appliance of material distributing machine, calculates thickness of feed layer by the cloth doses detecting the material distributing machine unit interval.
Vertical sintering speed computing unit 52, calculates material bed vertical sintering speed for utilizing known machine speed, known sintering end point and described thickness of feed layer.
Effective wind rate determining unit 53, for the effective wind rate utilizing the relation between effective wind rate and vertical sintering speed to determine each bellows.
Utilize the detection of exhaust gas compositions probe arranged in the large flue of sintering machine, such detection of exhaust gas compositions unit 54 can be popped one's head in by detection of exhaust gas compositions, detects the smoke components in large flue.In the embodiment of the present application, the smoke components that detection of exhaust gas compositions unit 54 detects refers to O in unit volume gas
2, CO, CO
2, N
2, NO, NO
2content.
Effective wind rate computing unit 55, for the effective wind rate utilizing the testing result of described detection of exhaust gas compositions unit 54 to calculate each bellows of current sintering machine.
Effective wind rate computing unit 55, calculates effective wind rate of all bellows according to formula (4) and (5) in embodiment one.
Search unit 56, in the mapping table of known thickness of feed layer and materialbeds comminution, search the materialbeds comminution corresponding with described thickness of feed layer.
When thickness of feed layer is equal, the material of different ratio, corresponding materialbeds comminution is different.And the material of identical proportioning, when thickness of feed layer is unequal, corresponding materialbeds comminution is not identical yet.So for the material of different ratio, set up the relation table of materialbeds comminution corresponding to Different layer of the compost thickness in advance by experiment, to facilitate while actually employed, corresponding materialbeds comminution can be found fast from the relation table set up in advance according to the proportioning of material, thickness of feed layer.
Negative pressure computing unit 57, for calculating large flue target negative pressure.In the present embodiment, utilize the formula (6) in embodiment one, (7) and (8), the target negative pressure of large flue can be calculated.
Control unit 58, for the large flue calculated target negative pressure is sent to main exhauster controller as regulating parameter, described main exhauster controller regulates the frequency of main exhauster to change to target frequency, and described target frequency equals the frequency corresponding to large flue target negative pressure.
In addition, when large flue exist leak out time, the negative pressure of main exhauster equals large flue target negative pressure and pipeline and to leak out negative pressure sum, and therefore, the negative pressure sum that needs large flue target negative pressure and pipeline to leak out sends to main exhauster controller as regulating parameter.Described pipeline leaks out and also to change when negative pressure variation is little little, and in actual applications, pipeline negative pressure of leaking out can obtain in advance by experiment, is then prestored in system.
Compared with prior art, this system that the embodiment of the present application provides, whatsoever reason causes thickness of feed layer to change, only need know current thickness of feed layer, can automatically, exactly the negative pressure of main exhauster is adjusted to the degree matched with current thickness of feed layer, and then under the prerequisite ensureing sintering quality, reduce main exhauster in sintering process and do not mate with system load the energy consumption caused.
Embodiment five:
In the present embodiment, detection of exhaust gas compositions unit 54, when detecting, detects the smoke components in large flue according to the time interval pre-set.
As shown in Figure 6, this sintering machine main air exhauster vacuum control system that the present embodiment provides, compared with embodiment illustrated in fig. 5, also comprises:
Amount of oxygen determining unit 61, is connected with detection of exhaust gas compositions unit 54, determines to participate in reaction amount of oxygen for utilizing described smoke components;
Amount of oxygen difference computational unit 62, determines to obtain the difference that amount of oxygen is reacted in participation after calculating adjacent twice detection smoke components;
Amount of oxygen dif ference judgment unit 63, is connected with described effective wind rate computing unit 55, for judging that described amount of oxygen determining unit 61 is determined whether the difference obtaining participating in reaction amount of oxygen is greater than and pre-set value.
When judged result is for being greater than, effective wind rate computing unit 55 utilizes current detection result to calculate effective wind rate of each bellows; During for being less than or equal to, effective wind rate computing unit 55 is according to effective wind rate of each bellows of the mean value computation of adjacent twice testing result.
In other embodiments based on embodiment four and embodiment five, between negative pressure computing unit 57 and control unit 58, also comprise following unit (not drawing in Fig. 5, Fig. 6):
Negative pressure measuring unit, for detecting the current negative pressure of large flue;
Judging unit, calculates the difference of the current negative pressure of large flue and large flue target negative pressure, and, judge whether described difference is more than or equal to the threshold value of setting.
If described difference is more than or equal to the threshold value of setting, then indicate control unit 58 that the large flue target negative pressure calculated is sent to main exhauster controller as regulating parameter; Otherwise, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter by instruction control unit 58, described bellows valve positioner regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target negative pressure before valve regulated.
Control unit 58 in the present embodiment, compares with the control unit 58 in embodiment five with embodiment four, changes.
Embodiment six:
In the present embodiment, detection of exhaust gas compositions unit 54, when detecting, detects the smoke components in large flue according to the time interval of setting.
As shown in Figure 7, the present embodiment, compared with embodiment illustrated in fig. 6, also comprises:
Negative pressure difference computational unit 71, for calculating the difference of the large flue target negative pressure that twice adjacent calculation obtains;
Negative pressure dif ference judgment unit 72, is connected with described control unit 58, pre-sets value for judging whether the difference of the large flue target negative pressure that negative pressure difference computational unit 71 calculates is greater than.
Regulating parameter determining unit 73, for when judged result is for being greater than, using the current large flue target negative pressure calculated as regulating parameter, and when judged result is for being less than or equal to, the average of large flue target negative pressure twice adjacent calculation obtained is as regulating parameter.
Determined regulating parameter is sent to main exhauster controller by last control unit 58.
Based in other embodiments of embodiment six, between negative pressure dif ference judgment unit 72 and control unit 58, also comprise following unit (not drawing in Fig. 7):
Negative pressure measuring unit, for detecting 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 whether described difference is more than or equal to the threshold value of setting, if described difference is more than or equal to the threshold value of setting, then indicate control unit 58, the large flue target negative pressure calculated is sent to main exhauster controller as regulating parameter; Otherwise, instruction control unit 58, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, and described bellows valve positioner regulates the aperture of bellows valve, makes large flue effective wind rate equal the effective wind rate of described large flue target negative pressure before valve regulated.
Control unit 58 in the present embodiment, compared with the control unit 58 in embodiment six, changes.
The above is only the preferred embodiment of the application, those skilled in the art is understood or realizes the application.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a sintering machine main air exhauster negative pressure control method, is characterized in that, comprising:
Measure the thickness of feed layer of material on pallet, known machine speed, known sintering end point and described thickness of feed layer is utilized to calculate the vertical sintering speed of material, and, utilize the relation between effective wind rate and vertical sintering speed to determine the effective wind rate of each bellows;
Detect the smoke components of large flue;
According to detecting the smoke components obtained, utilize
calculate the amount of oxygen participating in reaction, and utilize
calculate effective wind rate of each bellows;
In the mapping table of known thickness of feed layer and materialbeds comminution, search the materialbeds comminution corresponding with described thickness of feed layer;
Calculate large flue target negative pressure;
Large flue target negative pressure=materialbeds comminution * (the air quantity sums of all bellows)
2,
Described large flue target negative pressure is sent to main exhauster controller as regulating parameter, and described main exhauster controller regulates the frequency of main exhauster to change to target frequency, and described target frequency equals the frequency corresponding to large flue target negative pressure.
2. method according to claim 1, is characterized in that:
The thickness of feed layer that sintering pallet is positioned at material below material distributing machine is detected according to the time interval pre-set;
Or,
Obtain the inventory of sintering machine according to the time interval pre-set, calculate the thickness of feed layer calculated value corresponding with described inventory, regulate grade to determine the thickness of feed layer corresponding with described thickness of feed layer calculated value according to known thickness.
3. method according to claim 2, is characterized in that:
Periodically detect the smoke components in large flue in unit volume flue gas.
4. method according to claim 3, is characterized in that, also comprises:
Described smoke components is utilized to determine to participate in reaction amount of oxygen;
The difference obtaining participating in reaction amount of oxygen is determined after calculating adjacent twice detection smoke components;
Judge whether the described difference participating in reaction amount of oxygen is greater than and pre-set value;
If be greater than, determine after utilizing current detection smoke components that the participation reaction amount of oxygen obtained calculates effective wind rate of each bellows, otherwise, after detecting smoke components according to adjacent twice, determine the effective wind rate obtaining each bellows of mean value computation participating in reaction amount of oxygen.
5. method according to claim 4, is characterized in that, also comprises:
Calculate the difference of the large flue target negative pressure that twice adjacent calculation obtains;
Judge whether the difference of described large flue target negative pressure is greater than and pre-set value;
If be greater than, the current large flue target negative pressure calculated is defined as regulating parameter, otherwise the average of large flue target negative pressure twice adjacent calculation obtained is defined as regulating parameter;
Described regulating parameter is sent to described main exhauster controller.
6. the method according to claim 1,2,3,4 or 5, characterized by further comprising:
Detect the current negative pressure of large flue;
Calculate the difference of the current negative pressure of large flue and large flue target negative pressure;
If described difference is more than or equal to the threshold value of setting, then described large flue target negative pressure is sent to main exhauster controller as regulating parameter, otherwise, described large flue target negative pressure is sent to bellows valve positioner as regulating parameter, described bellows valve positioner regulates the aperture of bellows valve, makes the effective wind rate that large flue effective wind rate equals corresponding before valve regulated with described large flue target negative pressure.
7. a sintering machine main air exhauster vacuum control system, is characterized in that, comprising:
Bed of material measuring unit, for measuring the thickness of feed layer of material on pallet;
Vertical sintering speed computing unit, for the vertical sintering speed utilizing known machine speed, known sintering end point and described thickness of feed layer to calculate material;
Effective wind rate determining unit, for the effective wind rate utilizing the relation between effective wind rate and vertical sintering speed to determine each bellows;
Detection of exhaust gas compositions unit, for detecting the smoke components in large flue;
Effective wind rate computing unit, for according to described smoke components, utilizes
calculate the amount of oxygen participating in reaction, and utilize
calculate effective wind rate of each bellows;
Search unit, in the mapping table of known thickness of feed layer and materialbeds comminution, search the materialbeds comminution corresponding with described thickness of feed layer;
Negative pressure computing unit, for calculating large flue target negative pressure;
Large flue target negative pressure=materialbeds comminution * (the air quantity sums of all bellows)
2,
Control unit, for large flue target negative pressure is sent to main exhauster controller as regulating parameter, described controller regulates the frequency of main exhauster to change to target frequency, and described target frequency equals the frequency corresponding to large flue target negative pressure.
8. system according to claim 7, is characterized in that, described detection of exhaust gas compositions unit detects the smoke components in large flue in unit volume flue gas according to the time interval pre-set;
This system comprises further:
Amount of oxygen determining unit, determines for utilizing described smoke components to participate in reaction amount of oxygen;
Difference computational unit, determines to obtain the difference that amount of oxygen is reacted in participation after calculating adjacent twice detection smoke components;
Dif ference judgment unit, pre-sets value for judging whether the described difference participating in reaction amount of oxygen is greater than;
When judged result is for being greater than, after described effective wind rate computing unit utilizes current detection smoke components, determine that the participation reaction amount of oxygen obtained calculates effective wind rate of each bellows; Otherwise, after detecting smoke components according to adjacent twice, determine the effective wind rate obtaining each bellows of mean value computation participating in reaction amount of oxygen.
9. system according to claim 8, is characterized in that, this system comprises further:
Negative pressure difference computational unit, for calculating the difference of the large flue target negative pressure that twice adjacent calculation obtains;
Negative pressure dif ference judgment unit, pre-sets value for judging whether the difference of the large flue target negative pressure that negative pressure difference computational unit calculates is greater than;
Regulating parameter determining unit, for when judged result is for being greater than, the current large flue target negative pressure calculated is defined as regulating parameter, otherwise the average of large flue target negative pressure twice adjacent calculation obtained is defined as regulating parameter;
The described regulating parameter determined is sent to described main exhauster controller by described control unit.
10. system according to claim 9, is characterized in that, this system comprises further:
Air measuring unit, for detecting the current air quantity of large flue
Judging unit, for calculating the difference of the current air quantity of large flue and large flue target air volume;
If described difference is more than or equal to the threshold value of setting, then described large flue target air volume is sent to main exhauster controller as regulating parameter by described control unit, otherwise, described large flue target air volume is sent to bellows valve positioner as regulating parameter by described control unit, described bellows valve positioner regulates the aperture of bellows valve, makes the effective wind rate that large flue effective wind rate equals corresponding before valve regulated with described large flue target air volume.
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| CN103033050B (en) * | 2012-12-27 | 2014-06-18 | 中冶长天国际工程有限责任公司 | Frequency conversion control method and frequency conversion control system for main exhaust fan of sintering system |
| CN108344298B (en) * | 2018-03-28 | 2024-02-13 | 中冶长天国际工程有限责任公司 | Gas injection device capable of adaptively optimizing burden surface negative pressure and control method thereof |
| CN110345767A (en) * | 2019-07-31 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of exhausting system of sintering machine and air leak test judgment method |
| CN111521017B (en) * | 2020-04-17 | 2021-11-02 | 马鞍山钢铁股份有限公司 | Control method for balancing sintering air volume |
| CN112033172B (en) * | 2020-09-07 | 2022-07-22 | 无锡智澄电气科技有限公司 | Frequency adjusting method for sintering main exhaust fan |
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Effective date of registration: 20170527 Address after: 410000 No. 7 Festival Road, Changsha, Hunan, Yuelu District Co-patentee after: Hunan Changtian Automatic Control Engineering Co., Ltd. Patentee after: ZhongYe Changtian International Engineering Co., Ltd. Address before: Labor Road 410007 in Hunan province Changsha Yuhua District No. 1 Patentee before: ZhongYe Changtian International Engineering Co., Ltd. |