CN102032787B - Method and system for adjusting double large flues of sintering machine - Google Patents
Method and system for adjusting double large flues of sintering machine Download PDFInfo
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Abstract
The invention discloses a method and a system for adjusting double large flues of a sintering machine. The method comprises the following steps of: setting air quantities required by production as target air quantities of fans, and starting the fans after air doors of the fans are opened completely; controlling the output frequencies of frequency converters of two fans to alternatively increase in a stepping way; and when the air quantities of the two fans reach the target air quantities, keeping the current output frequencies of the frequency converters of the two fans unchanged. Through the method and the system, the output frequencies of the frequency converters of the two fans are controlled to alternatively increase in the stepping way, so that the air quantities of the two fans increase alternatively until the air quantities reach the quantities required by production, and simultaneously the current balance states of the two fans are detected, and the step size of the increase of the output frequencies of frequency converters of the fans is adjusted according to the current balance states at any time; therefore, the phenomena of imbalance out of the reasonable range and breakdown of the two fans in the production process are avoided and the working efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of metallurgical sintering equipment, in particular to a method and a system for adjusting double large flues of a sintering machine.
Background
In steel sintering equipment, a large flue of a sintering machine is a channel for exhausting airflow coming from a trolley of the sintering machine from a chimney through a main exhaust fan. Due to the limitation of factors such as structure, materials and the like, the current common sintering machine with the length of more than 300 square meters mostly adopts double large flues, wherein two main exhaust fans are arranged in parallel and share a chimney; as shown in fig. 1 and 2, the fan 2 draws the air flow from the trolley through the large flue 1 and the damper 3 and discharges the air flow from the chimney 4.
Although two large flues arranged in the sintering machine are relatively independent, in actual production, because the loads of the two large flues cannot be balanced at any time, the condition that the two flues cross wind mutually occurs, especially, a common section part exists in the two large flues, as shown in fig. 2, the influence on the two fans is more obvious when the cross wind occurs: when cross wind occurs, because the loads of the two fans are unbalanced, the air flow rates of sintering ores of the trolley on the two flues are inconsistent, the sintering qualities of the sintering ores on the left side and the right side of the trolley are different, and one side is over-sintered and the other side is not through-sintered; in addition, when wind cross occurs, a part of wind quantity is consumed between the two fans, so that the use efficiency of the fans is influenced; even in extreme cases, it may lead to the situation that one fan blows another: that is, the airflow in one large flue drives the airflow in the other large flue, so that one fan carries two fan loads, one fan runs above the rated power, the other fan is blown, and the running load is lower than the no-load, so that the protection trip of one fan is caused, and the continuous production is influenced.
Therefore, in actual production, in order to keep the existing balance between the two fans, the load of the fans must be adjusted by adjusting the air volume of the fans, so that accidents are avoided; at present, the manual work is mainly used, namely, the post operator of the fan room finds and adjusts the post in time, but the mode is obviously low in efficiency, and the fan system is broken down due to the fact that adjustment cannot be made in time, and normal production is affected.
Disclosure of Invention
In view of this, in order to solve the deficiency of the existing manual air volume adjustment, embodiments of the present invention provide a method and a system for adjusting two large flues of a sintering machine, which can ensure that the two fans do not collapse and exceed the unbalance phenomenon of a reasonable range in the production process, and improve the working efficiency.
Therefore, the technical scheme provided by the embodiment of the invention is as follows:
a method for realizing adjustment of double large flues of a sintering machine comprises the following steps:
setting the air quantity required by production as the target air quantity of the fan, and starting the fan after the air door of the fan is fully opened;
controlling the output frequencies of frequency converters of the two fans to alternately and step up;
and when the two fans reach the target air quantity, keeping the output frequency of the current fan frequency converter unchanged.
Preferably, whether the current fan air volume reaches the target air volume is determined by the following method: acquiring fan current corresponding to the air quantity required by production by utilizing the proportional relation between the air quantity of a fan and the fan current; and detecting the current of the fan, and determining that the current air quantity of the fan is the target air quantity when the current of the fan reaches the current of the fan corresponding to the air quantity required by production.
Preferably, the method further comprises: and detecting the current of the two fans while controlling the output frequency of the frequency converters of the two fans to alternately and step up, and adjusting the output frequency of the frequency converters according to the current of the two fans.
Preferably, the adjusting the output frequency of the frequency converter according to the current of the two fans includes: when the output frequencies of the two fan frequency converters are equal, if the currents of the two fans are unbalanced, the output frequency of the frequency converter corresponding to the fan with the lower current is increased by a plurality of hertz more than the output frequency of the fan frequency converter with the higher current until the currents of the two fans are balanced; the frequency converter of the fan with smaller current has the frequency increasing step length of 1 Hz.
Preferably, the method further comprises: and detecting the current of the two fans, and if the current of one fan is suddenly reduced, increasing the output frequency of a frequency converter corresponding to the fan until the current between the two fans reaches a new balance.
Preferably, the step length of the output frequency of the frequency converters of the two fans which are alternately stepped up is 1 Hz.
A system for realizing adjustment of double large flues of a sintering machine comprises: a setting unit, a control unit and a processing unit; the setting unit is used for setting the air quantity required by production as the target air quantity of the fan, informing the control unit and the processing unit, and then starting the fan after the air door of the fan is fully opened; the control unit is used for controlling the output frequencies of the frequency converters of the two fans to alternately and step up after the target air volume is set by the setting unit; the processing unit is used for detecting the air volume of the two fans, and informing the control unit to keep the output frequency of the current fan frequency converter unchanged after the air volume of the fans reaches the target air volume set by the setting unit.
Preferably, the processing unit includes: the device comprises an acquisition module and a detection module; the acquisition module is used for acquiring fan current corresponding to the air quantity required by production by utilizing the proportional relation between the fan air quantity and the fan current; the detection module is used for detecting the current of the fan and informing the control unit to keep the current output frequency of the fan frequency converter unchanged when the current of the fan reaches the current of the fan corresponding to the air quantity required by production.
Preferably, the system further comprises: and the adjusting unit is used for detecting the current of the two fans and adjusting the output frequency of the frequency converter according to the current of the two fans when the control unit controls the output frequency of the frequency converter of the two fans to alternately and step up.
Preferably, the system further comprises: and the balancing unit is used for detecting the current of the two fans, and informing the control unit to increase the output frequency of the frequency converter corresponding to one fan when the current of the other fan is suddenly reduced until the current between the two fans reaches new balance.
According to the technical scheme provided by the invention, the output frequencies of the frequency converters of the two fans are controlled to alternately and step up, so that the air quantities of the two fans alternately and step up, until the air quantity required by production is achieved, the current balance states of the two fans are detected, and the step length for increasing the output frequencies of the frequency converters of the fans is adjusted at any time according to the current balance states, so that the phenomena of collapse and unbalance exceeding a reasonable range are avoided in the production process of the two fans, and the working efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a double large flue of a sintering machine in the prior art;
FIG. 2 is a top view of a double large flue of a sintering machine in the prior art;
FIG. 3 is a schematic flow chart of a method according to a first embodiment of the present invention;
FIG. 4 is a schematic view of the fan damper in the first embodiment of the present invention fully opened;
fig. 5 is a schematic system structure diagram of a fourth embodiment of the present invention.
Detailed Description
So that those skilled in the art can better understand the concept of the present invention and can better understand the objects, features, and advantages of the present invention, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 3, fig. 3 is a schematic flow chart of a double flue adjusting method according to a first embodiment of the present invention; wherein, the method comprises the following steps:
step 301: setting the air quantity required by production as the target air quantity of the fan, and starting the fan after the air door of the fan is fully opened;
before the two fans are started, firstly, according to actual requirements, the air volume required for production is respectively set as the target air volume of the two fans, and the air doors of the two fans are ensured to be opened completely, namely the opening degree of the air doors of the fans is the maximum, as shown in fig. 4, the opening degree of the air doors 3 of the fans is 90 degrees, namely the air doors 3 and the flue 1 are in a parallel state, and then the fans are started.
Step 302: controlling the output frequencies of frequency converters of the two fans to alternately and step up;
specifically, after the two fans are started, the output frequencies of frequency converters of the two fans are controlled to alternately increase from small to large, so that the frequency of the two fans is prevented from directly increasing to the rated frequency at the same time; for example, the output frequency of the frequency converter A of the fan 1 is controlled to be 1Hz, the output frequency of the frequency converter B of the fan 2 is controlled to be 1Hz, the output frequency of the frequency converter A of the fan 2 is controlled to be 2Hz, the output frequency of the frequency converter B of the fan 2 is controlled to be 2Hz, and the like; of course, the specific step length for increasing the output frequency of the frequency converter can be adjusted according to the actual situation, for example, the output frequency of the frequency converter of the two fans is controlled to be increased by 2Hz in an alternating stepping manner;
it should be noted that, the change of the output frequency of the fan frequency converter may cause the change of the rotational speed of the fan, and the change of the rotational speed of the fan may cause the change of the air volume extracted by the fan, and the air volume of the fan is generally proportional to the fan load, and the change of the fan load may be reflected on the current change, so that in the process of the alternating stepped increase of the output frequency of the fan frequency converter, if the current changes of the two fans are balanced, it indicates that the air volumes extracted by the two fans are also in a balanced state currently;
furthermore, as the output frequency of the frequency converters of the two fans rises alternately, the rotating speeds of the two fans are increased alternately, and the air quantity extracted by the two fans is increased alternately; meanwhile, because the output frequency of the two-fan frequency converter rises in a stepping mode, the rotating speeds of the two fans are gradually increased in a stepping mode, and further the air quantity extracted by the two fans is gradually increased in a stepping mode. The load of the two fans is increased step by step in the process that the air quantity extracted by the two fans is increased step by step alternately, so that the condition that the rotating speed of the two fans is increased suddenly due to the fact that the frequency of the two fans is increased to the rated frequency directly and simultaneously, and the load of the two fans is increased suddenly due to the fact that the extracted air quantity is increased suddenly is avoided, and the condition that the load is unbalanced easily occurs under the condition that the load is increased suddenly; therefore, the mode of controlling the output frequency of the frequency converter of the fan to rise in an alternating and stepping mode can effectively control the phenomenon that the two fans are not collapsed and out of balance in a reasonable range in the production process, and therefore the working efficiency of the fans can be greatly improved.
Step 303: and when the two fans reach the target air quantity, keeping the output frequency of the current fan frequency converter unchanged.
As described above, the change of the output frequency of the fan frequency converter may cause the change of the fan air volume, the change of the fan air volume may cause the change of the fan load, and the change of the fan load may reflect the current, so that the present embodiment proposes that whether the current fan air volume reaches the target air volume may be determined according to the fan current, and certainly, whether the current fan air volume reaches the target air volume may also be determined by other manners, which is not described herein again;
for example: if the rated current of the fan is 461A, the rated wind rate of the fan is 19800 cubic meters per minute, the output frequency of a frequency converter of the fan is in direct proportion to the rotating speed of the fan, the cube of the rotating speed is in direct proportion to the power, and under the condition that the frequency is close, the current is close, so that the wind rate of the fan is theoretically in direct proportion to the 2/3 th power of the current, wherein the influence of the work for overcoming the resistance on the current is ignored in the embodiment; therefore, if the air quantity required for production is 19800 cubic meters per minute, the current of the fan corresponding to the air quantity required for production is 461A, and at the moment, the target air quantity of the fan is also set to be 19800 cubic meters per minute through the steps, the current corresponding to the target air quantity of the fan is 461A, so that when the current of the fan reaches 461A, the current of the fan can be determined to reach the target air quantity of 19800 cubic meters per minute.
The second embodiment of the present invention also provides a method for adjusting two large flues, which is similar to the method of the first embodiment, except that the method further includes, between step 302 and step 303 of the first embodiment 1:
step 304: detecting the current of the two fans while controlling the output frequency of the frequency converters of the two fans to alternately increase in a stepping manner, and adjusting the output frequency of the frequency converters of the fans according to the current of the two fans; specifically, the following can be implemented, but not limited thereto:
when the frequency converter output frequency of controlling two fans rises step by step in turn, detect two fan electric currents, according to the electric current of two fans of the ascending in-process of two fan frequency converter output frequency decides which fan's frequency converter output frequency rises or rises more earlier: under normal conditions, the larger the output frequency of the fan frequency converter is, the larger the rotating speed of the fan is, the larger the air volume extracted by the fan is, the larger the current of the fan is, but two flues of a double-flue system can influence each other, so that in the process of alternately stepping up the output frequencies of the two fan frequency converters, the situation that the currents of the two fans are not completely balanced may occur, namely, when the output frequencies of the two fan frequency converters rise to a certain value, the currents of the two fans are different; at this time, in this embodiment, when the output frequencies of the two fan frequency converters are equal, if the currents of the two fans are unbalanced, the output frequency of the frequency converter corresponding to the fan with the smaller current is controlled to increase by a plurality of hertz more than the output frequency of the fan frequency converter with the larger current until the currents of the two fans reach balance, so as to balance the loads of the two fans; the step length of the frequency converter corresponding to the fan with the lower current, which is increased more, can be adjusted according to actual conditions, and the step length is usually selected to be 1Hz on the principle that each adjustment does not cause drastic change of air flow in the double flue;
it should be noted that after the output frequency of the fan frequency converter is adjusted, the original airflow balance in the large flue changes, and it usually takes a certain time to establish a new balance, so this embodiment proposes that after the output frequency of the fan frequency converter is adjusted, if the currents of the two fans do not change greatly within about 10s, it can be considered that the balance is already established, and the specific time can be determined according to the actual situation.
In addition, a third embodiment of the present invention provides that, on the basis of the first embodiment, the method for adjusting the double large flues further includes:
step 305: in the sintering production process, if the loads of the two fans are seriously unbalanced, the air doors of the two fans are adjusted to be in a balance range and then to be in the air quantity required by production, so that the smooth production is ensured;
specifically, the load of the fan is indirectly adjusted according to the output frequency of the fan frequency converter, under normal conditions, after the output frequency of the fan frequency converter rises, the rotating speed of the fan is increased, the air volume extracted by the fan is increased, the current of the fan is also increased, and the load of a corresponding air door is also increased.
The double-flue adjusting method provided by the above embodiments can be seen that the output frequencies of the two fan frequency converters are controlled to alternately and step up, so that the air quantities of the two fans alternately rise until the air quantity required by production is reached, the current balance states of the two fans are detected at the same time, and the rising step length of the output frequencies of the fan frequency converters is adjusted at any time according to the current balance states, so that the two fans are prevented from collapsing and exceeding the reasonable range in the production process, and the working efficiency is greatly improved.
Based on the above idea, a fourth embodiment of the present invention further provides a system for adjusting two large flues of a sintering machine, as shown in fig. 5, including: a setting unit 501, a control unit 502, and a processing unit 503; wherein,
the setting unit 501 is configured to set an air volume required for production as a target air volume of the fan, notify the control unit 502 and the processing unit 503 of the target air volume, and then start the fan after the air door of the fan is fully opened;
the control unit 502 is configured to control the frequency converter output frequencies of the two fans to alternately increase in steps after the setting unit 501 sets the target air volume;
the processing unit 503 is configured to detect air volumes of the two fans, and notify the control unit 502 to keep the output frequency of the current fan frequency converter unchanged when the air volumes of the fans reach the target air volume set by the setting unit.
Based on the above system, the processing unit 503 includes: the device comprises an acquisition module and a detection module; the acquisition module is used for acquiring fan current corresponding to the air quantity required by production by utilizing the proportional relation between the fan air quantity and the fan current; the detection module is used for detecting the current of the fan and informing the control unit to keep the current output frequency of the fan frequency converter unchanged when the current of the fan reaches the current of the fan corresponding to the air quantity required by production.
In addition, this system that realizes two big flues of sintering machine and adjust can also include: and the adjusting unit is used for detecting the current of the two fans and adjusting the output frequency of the frequency converter according to the current of the two fans when the control unit 502 controls the output frequency of the frequency converter of the two fans to alternately increase in a stepping manner.
In addition, this system that realizes two big flues of sintering machine and adjust can also include: and a balancing unit, configured to detect currents of the two fans, and notify the control unit 502 to increase an output frequency of a frequency converter corresponding to one of the fans when the current of the one fan suddenly decreases, until the current between the two fans reaches a new balance.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for realizing adjustment of double large flues of a sintering machine is characterized by comprising the following steps:
setting the air quantity required by production as the target air quantity of the fan, and starting the fan after the air door of the fan is fully opened;
controlling the output frequencies of frequency converters of the two fans to alternately and step up;
and when the two fans reach the target air quantity, keeping the output frequency of the current fan frequency converter unchanged.
2. The method of claim 1, wherein determining whether the current fan air volume has reached the target air volume is performed by:
acquiring fan current corresponding to the air quantity required by production by utilizing the proportional relation between the air quantity of a fan and the fan current;
and detecting the current of the fan, and determining that the current air quantity of the fan is the target air quantity when the current of the fan reaches the current of the fan corresponding to the air quantity required by production.
3. The method of claim 1, further comprising:
and detecting the current of the two fans while controlling the output frequency of the frequency converters of the two fans to alternately and step up, and adjusting the output frequency of the frequency converters according to the current of the two fans.
4. The method of claim 3, wherein adjusting the inverter output frequency based on the two fan current comprises:
when the output frequencies of the two fan frequency converters are equal, if the currents of the two fans are unbalanced, the output frequency of the frequency converter corresponding to the fan with the lower current is increased by a plurality of hertz more than the output frequency of the fan frequency converter with the higher current until the currents of the two fans are balanced; the frequency converter of the fan with smaller current has the frequency increasing step length of 1 Hz.
5. The method of claim 1, further comprising:
and detecting the current of the two fans, and if the current of one fan is suddenly reduced, increasing the output frequency of a frequency converter corresponding to the fan until the current between the two fans reaches a new balance.
6. The method according to any one of claims 1 to 5, characterized in that:
the step length of the frequency converter output frequency of the two fans which alternately steps up is 1 Hz.
7. The utility model provides a system for realize two big flues of sintering machine and adjust which characterized in that includes: a setting unit, a control unit and a processing unit; wherein,
the setting unit is used for setting the air quantity required by production as the target air quantity of the fan, informing the control unit and the processing unit, and starting the fan after the air door of the fan is fully opened;
the control unit is used for controlling the output frequencies of the frequency converters of the two fans to alternately and step up after the target air volume is set by the setting unit;
the processing unit is used for detecting the air volume of the two fans, and informing the control unit to keep the output frequency of the current fan frequency converter unchanged after the air volume of the fans reaches the target air volume set by the setting unit.
8. The system of claim 7, wherein the processing unit comprises: the device comprises an acquisition module and a detection module; wherein,
the acquisition module is used for acquiring fan current corresponding to the air quantity required by production by utilizing the proportional relation between the fan air quantity and the fan current;
the detection module is used for detecting the current of the fan and informing the control unit to keep the current output frequency of the fan frequency converter unchanged when the current of the fan reaches the current of the fan corresponding to the air quantity required by production.
9. The system of claim 7, further comprising: and the adjusting unit is used for detecting the current of the two fans and adjusting the output frequency of the frequency converter according to the current of the two fans when the control unit controls the output frequency of the frequency converter of the two fans to alternately and step up.
10. The system of claim 7, further comprising: and the balancing unit is used for detecting the current of the two fans, and informing the control unit to increase the output frequency of the frequency converter corresponding to one fan when the current of the other fan is suddenly reduced until the current between the two fans reaches new balance.
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| CN 200910178551 CN102032787B (en) | 2009-09-29 | 2009-09-29 | Method and system for adjusting double large flues of sintering machine |
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| CN103185836B (en) * | 2011-12-27 | 2015-03-18 | 上海宝钢设备检修有限公司 | Measuring method for output frequency of frequency converter of variable frequency fan under different working conditions |
| CN103017534B (en) * | 2012-12-27 | 2014-06-04 | 中冶长天国际工程有限责任公司 | Method and system for controlling negative pressure of main draft fan of sintering machine |
| CN103033055B (en) * | 2012-12-27 | 2015-01-21 | 中冶长天国际工程有限责任公司 | Air volume control method and air volume control system for main exhaust fan of sintering machine |
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
| CN104533818B (en) * | 2014-12-22 | 2016-09-07 | 大唐贵州发耳发电有限公司 | A kind of parallel fan automatic adjusting balance control system |
| CN109250507A (en) * | 2018-08-28 | 2019-01-22 | 贵阳振兴铝镁科技产业发展有限公司 | A kind of hyper-dense phase conveying system material flow adjusting method |
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