CN102032787A - 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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- CN102032787A CN102032787A CN 200910178551 CN200910178551A CN102032787A CN 102032787 A CN102032787 A CN 102032787A CN 200910178551 CN200910178551 CN 200910178551 CN 200910178551 A CN200910178551 A CN 200910178551A CN 102032787 A CN102032787 A CN 102032787A
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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 present invention relates to metallurgy sintered equipment technical field, particularly a kind of method and system that realize that the two large flues of sintering machine are regulated.
Background technology
In steel sintering equipment, the large flue of sintering machine is that the air communication that sintering pallet is come is crossed the passage that main exhauster is discharged from chimney.And be subjected to the restriction of factors such as structure and material, and the above sintering machine of the 300 square meters commonly used at present pair large flues that adopt more, wherein two main exhausters are arranged in parallel, concentric stack; As depicted in figs. 1 and 2, blower fan 2 air communication that chassis is come is crossed large flue 1 and air door 3 is extracted out and discharged from chimney 4.
Wherein, though two large flues arranging in the sintering machine are relatively independent, but in actual production, because the load of two large flues can not all guarantee balance at any time, so having two flues goes here and there the situation of wind mutually and occurs, especially there is the common segment part in two large flues, as shown in Figure 2, influence to two typhoon machines when string wind occurring is just more obvious: when string wind occurring, because two typhoon machines is load unbalanced, can cause the air mass flow of chassis sintering deposit on two flues inconsistent, causes the sintering quality difference of chassis left and right sides sintering deposit, and then cause a side burning, and the opposite side burning is not saturating; In addition, part air quantity in-fighting between two typhoon machines when string wind occurring, thus also can influence the service efficiency of blower fan; Even under extreme case; the situation that may cause a typhoon machine to blow an other typhoon machine occurs: promptly the interior air-flow of large flue has driven the interior air-flow of another one large flue; cause a typhoon machine band two typhoon machines load; the typhoon machine that makes surpasses rated power operation; and an other typhoon machine is blown; its running load is lower than unloaded load, thereby causes a typhoon organizational security to protect tripping operation, and what influence was produced carries out continuously.
Thereby, in actual production,, just must adjust the load of blower fan, thereby avoid the appearance of accident by regulating fan delivery for keeping existing balance between the two typhoon machines; And mainly be to rely on artificial the participation at present, promptly Ventilator Room post operation personnel in time find and in time regulate, but the obvious efficient of this mode is very low, and owing to can't in time adjust the collapse that can cause blower fan system, what influence was produced normally carries out.
Summary of the invention
In view of this, in order to solve the deficiency of existing manual adjustment air quantity, the embodiment of the invention provides a kind of method and system that realize that the two large flues of sintering machine are regulated, and the energy imbalance of zone of reasonableness does not appear collapsing and exceeding in the two typhoon machines that can guarantee in process of production, has improved operating efficiency.
For this reason, the technical scheme that provides of the embodiment of the invention is as follows:
A kind of method that realizes that the two large flues of sintering machine are regulated comprises:
Production institute required airflow is set at the target air quantity of blower fan, and behind the air door of fan standard-sized sheet, starts blower fan;
The frequency converter output frequency of controlling two typhoon machines replaces stepping and rises;
After reaching the target air quantity, two typhoon machines keep current fan frequency converter output frequency constant.
Preferably, come in the following manner to determine whether current fan delivery reaches the target air quantity: utilize the fan delivery and the proportionate relationship of blower fan electric current to obtain the corresponding blower fan electric current of production institute required airflow; Detect the blower fan electric current, when described blower fan electric current has reached the blower fan electric current of production institute required airflow correspondence, determine that current fan delivery is the target air quantity.
Preferably, this method also comprises: detect two blower fan electric currents when the frequency converter output frequency of control two blower fans replaces the stepping rising, and adjust the frequency converter output frequency according to the electric current of two blower fans.
Preferably, describedly adjust the frequency converter output frequency according to two blower fan electric currents and comprise: when two fan frequency converter output frequencies equate, if two blower fan current imbalances, the frequency converter output frequency of then that electric current is less blower fan correspondence rises some hertz compared to the bigger fan frequency converter output frequency of electric current, till the electric current of two blower fans reaches balance; The less fan frequency converter output frequency step-lengths that rise of wherein said electric current are 1Hz more.
Preferably, this method also comprises: detect two blower fan electric currents, if wherein the electric current of a typhoon machine reduces suddenly, then the corresponding frequency converter output frequency of this blower fan is raise, till the electric current between the two typhoon machines reaches new balance.
Preferably, to replace the step-length that stepping rises be 1Hz to the frequency converter output frequency of described two typhoon machines.
A kind of system that realizes that the two large flues of sintering machine are regulated comprises: unit, control module and processing unit are set; Wherein, the described unit that is provided with is in order to being set at the target air quantity of blower fan with production institute required airflow, and is notified to described control module and processing unit, starts blower fan then behind the air door of fan standard-sized sheet; Described control module in order to described the unit be set be provided with the target air quantity after, the frequency converter output frequency of controlling two typhoon machines replaces stepping and rises; Described processing unit is in order to detecting the air quantity of two typhoon machines, and when described fan delivery reach described the target air quantity that the unit is provided with is set after, notify described control module to keep current fan frequency converter output frequency constant.
Preferably, described processing unit comprises: acquisition module and detection module; Wherein, described acquisition module is used to utilize the fan delivery and the proportionate relationship of blower fan electric current to obtain the corresponding blower fan electric current of production institute required airflow; Described detection module is used to detect the blower fan electric current, and when described blower fan electric current has reached the blower fan electric current of production institute required airflow correspondence, notifies described control module to keep current fan frequency converter output frequency constant.
Preferably, this system also comprises: adjustment unit, be used for replacing when stepping rises at the frequency converter output frequency that described control module is controlled two blower fans, and detect two blower fan electric currents, and adjust the frequency converter output frequency according to the electric current of two blower fans.
Preferably, this system also comprises: balancing unit, be used to detect two blower fan electric currents, and when wherein the electric current of a typhoon machine reduces suddenly, notify described control module that the corresponding frequency converter output frequency of this blower fan is raise, till the electric current between the two typhoon machines reaches new balance.
By above technical scheme provided by the invention as seen, replace the stepping rising by controlling two fan frequency converter output frequencies, make the air quantity of two typhoon machines replace the stepping rising mutually, until reaching production institute required airflow, detect the current balance type state of two blower fans simultaneously, and adjust the step-length that the fan frequency converter output frequency rises at any time according to described current balance type state, thereby guaranteed that the energy imbalance of zone of reasonableness does not appear collapsing and exceeding in two typhoon machines in process of production, and improved operating efficiency greatly.
Description of drawings
Fig. 1 is the structural representation of the two large flues of sintering machine in the prior art;
Fig. 2 is the vertical view of the two large flues of sintering machine in the prior art;
Fig. 3 is the method flow schematic diagram of first embodiment of the invention;
Fig. 4 is the structural representation of the air door of fan standard-sized sheet in the first embodiment of the invention;
Fig. 5 is the system architecture schematic diagram of fourth embodiment of the invention.
The specific embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Referring to Fig. 3, Fig. 3 is two large flue control method schematic flow sheets of first embodiment of the invention; Wherein, this method comprises:
Step 301: production institute required airflow is set at the target air quantity of blower fan, and behind the air door of fan standard-sized sheet, starts blower fan;
Before two typhoon machines start, at first at actual demand, production institute required airflow is set at the target air quantity of two typhoon machines respectively, and to guarantee the air door of two typhoon machines is all opened, promptly make the aperture maximum of described air door of fan, as shown in Figure 4, the aperture of described air door of fan 3 is 90 degree, also be 1 one-tenth parastate of air door 3 and flue, and then start blower fan.
Step 302: the frequency converter output frequency of controlling two typhoon machines replaces stepping and rises;
Concrete, after two typhoon machines started, the frequency converter output frequency of controlling two typhoon machines alternately rose from small to large, avoided making the frequency of two typhoon machines directly to rise to rated frequency simultaneously; For example the frequency converter A output frequency of control blower fan 1 is 1Hz earlier, and the frequency converter B output frequency of controlling blower fan 2 again is 1Hz, and the frequency converter A output frequency of controlling blower fan 2 then is 2Hz, and the frequency converter B output frequency of controlling blower fan 2 again is 2Hz, and the rest may be inferred; Certainly concrete frequency converter output frequency rising step-length can be adjusted according to actual conditions, as the frequency converter output frequency of controlling two blower fans replaces stepping rising 2Hz etc.;
Wherein, it should be noted that, the variation of described fan frequency converter output frequency can cause the variation of described rotation speed of fan, and the variation of described rotation speed of fan can cause that described blower fan extracts the variation of air quantity, and described fan delivery is directly proportional with described blower fan load usually, and the variation of blower fan load can be reflected in the electric current variation, thereby replace in the process that stepping rises at described fan frequency converter output frequency, if the electric current of two blower fans changes balance, show that then the air quantity of the described extraction of current two blower fans also is in poised state;
Further, because two fan frequency converter output frequencies are alternately upwards, will cause the rotating speed of two blower fans also alternately to increase, and then the air quantity that causes two blower fans to extract also is alternately to increase; Simultaneously, because the rising of two fan frequency converter output frequencies is to carry out in the mode of stepping, it can make the rotating speed of two blower fans also increase gradually with step-by-step system, and then the air quantity that causes two blower fans to be extracted also increases gradually with step-by-step system.And because the variation of air quantity that air door extracts can cause the variation of blower fan load, so in the process that air quantity that two blower fans are extracted alternately increases gradually in the mode of stepping, the load of described two blower fans also replaces stepping and increases gradually, this just can be avoided causing its rotating speed to increase suddenly because the frequency of two typhoon machines directly rises to rated frequency simultaneously, and then the air quantity that makes its extraction increases the situation that caused two blower fans load increases suddenly suddenly, and just is easy to occur load unbalanced situation under the situation that this load increases suddenly; Thereby the mode that replaces the stepping rising by control fan frequency converter output frequency can effectively be controlled the energy imbalance that zone of reasonableness does not appear collapsing and exceeding in two typhoon machines in process of production, thereby can improve the operating efficiency of blower fan greatly.
Step 303: after two typhoon machines reach the target air quantity, keep current fan frequency converter output frequency constant.
As mentioned above, the variation of described fan frequency converter output frequency can cause the variation of fan delivery, and the variation of fan delivery can cause the variation of blower fan load, the variation of blower fan load can be reflected on the electric current, thereby present embodiment proposes and can determine whether current fan delivery has reached the target air quantity according to the blower fan electric current, certainly also can determine that whether current fan delivery has reached the target air quantity, repeats no more herein by other modes;
For example: if the blower fan rated current is 461A, the nominal air delivery of blower fan is 19800 cubic metres/minute, and the fan frequency converter output frequency is directly proportional with rotation speed of fan, cube being directly proportional again with power of rotating speed, under the approaching situation of frequency, electric current should be approaching, so the air quantity of blower fan is directly proportional with 2/3 power of electric current in theory, wherein present embodiment is ignored and overcome the influence of resistance institute work to electric current; Thereby, if production institute required airflow is 19800 cubic metres/timesharing, the blower fan electric current of its production institute required airflow correspondence is 461A, also be set at 19800 cubic metres/timesharing by abovementioned steps with the target air quantity of blower fan this moment, the electric current of correspondence also was 461A when then blower fan reached the target air quantity, so when the electric current of described blower fan reaches 461A, can determine that the current air quantity of described blower fan has reached 19800 cubic metres/minute of target air quantity.
The embodiment of the invention two has also proposed a kind of pair of large flue control method, and the method for this method and the foregoing description one is similar, and difference is also to comprise between step 302 of the foregoing description 1 and step 303:
Step 304: when the frequency converter output frequency of control two typhoon machines replaces the stepping rising, detect two blower fan electric currents, and adjust the fan frequency converter output frequency according to the electric current of two blower fans; Concrete, can realize by following manner, but be not limited thereto:
When the frequency converter output frequency of control two typhoon machines replaces the stepping rising, detect two blower fan electric currents, electric current according to two typhoon machines in the described two fan frequency converter output frequency uphill process decides the frequency converter output frequency of which typhoon machine to rise earlier or rise more: under the normal condition, described fan frequency converter output frequency is big more, the rotating speed of blower fan is also big more, the air quantity that blower fan extracts is also big more, the electric current of blower fan is also just big more, but two flues of twin flue system can influence each other, so replace in the process of stepping rising at two fan frequency converter output frequencies, the electric current of two typhoon machines and the situation of incomplete equilibrium may appear, promptly after two fan frequency converter output frequencies rise to certain value, the two typhoon electromechanics difference to some extent that fails to be convened for lack of a quorum; At this moment, present embodiment proposes when two fan frequency converter output frequencies equate, if two blower fan current imbalances, the frequency converter output frequency of then controlling the blower fan correspondence that electric current is less rises some hertz compared to the bigger fan frequency converter output frequency of electric current, till the electric current of two blower fans reaches balance, and then the load of balance two blower fans; The frequency converter output frequency of the blower fan correspondence that wherein said electric current the is less step-lengths that rise can be adjusted according to actual conditions more, can not cause with each adjusting that the air-flow acute variation is a principle in the twin flue, and selecting this step-length usually is 1Hz;
It should be noted that, after adjusting the fan frequency converter output frequency, original air balance promptly changes in the large flue, usually need certain hour and set up new balance, if thereby present embodiment proposes electric current at two typhoon machines after the adjustment of fan frequency converter output frequency and do not have big variation can think that its balance sets up in the time about 10s, the certainly concrete time can be determined according to actual conditions.
In addition, the embodiment of the invention three proposes on the basis of the foregoing description one, and this pair large flue control method also can comprise:
Step 305: in sintering production process,, then the air door of two typhoon machines is regulated if the load of two typhoon machines is seriously uneven, make it return in the range of balance after, return to production institute required airflow again, what guarantee to produce carries out smoothly;
Concrete, the load of blower fan is to come indirect regulation according to the size of fan frequency converter output frequency, under normal situation, after the fan frequency converter output frequency rises, rotation speed of fan increases, the air quantity that blower fan extracts increases, the blower fan electric current also increases, corresponding air door load also increases, if and this moment wherein the electric current of a typhoon machine reduce suddenly, then control raises the frequency converter output frequency of this blower fan correspondence, to improve the rotating speed of described blower fan, and then increase this electric current load of the blower fan of minimizing suddenly, so that reach new balance between the two typhoon machines.
The two large flue control methods that provided by above each embodiment as can be seen, replace the stepping rising by controlling two fan frequency converter output frequencies, make the air quantity of two typhoon machines alternately rise mutually, until reaching production institute required airflow, detect the current balance type state of two blower fans simultaneously, and adjust the step-length that the fan frequency converter output frequency rises at any time according to described current balance type state, thereby guaranteed that the energy imbalance of zone of reasonableness does not appear collapsing and exceeding in two typhoon machines in process of production, and improved operating efficiency greatly.
Based on above-mentioned thought, the fourth embodiment of the present invention also provides a kind of system that realizes that the two large flues of sintering machine are regulated, and as shown in Figure 5, comprising: unit 501, control module 502 and processing unit 503 are set; Wherein,
The described unit 501 that is provided with is in order to being set at the target air quantity of blower fan with production institute required airflow, and is notified to described control module 502 and processing unit 503, starts blower fan then behind the air door of fan standard-sized sheet;
Described control module 502 in order to described unit 501 be set be provided with the target air quantity after, the frequency converter output frequency of controlling two typhoon machines replaces stepping and rises;
Described processing unit 503 is in order to detecting the air quantity of two typhoon machines, and when described fan delivery reach described the target air quantity that the unit is provided with is set after, notify described control module 502 to keep current fan frequency converter output frequency constant.
Wherein, based on said system, described processing unit 503 comprises: acquisition module and detection module; Described acquisition module is used to utilize the fan delivery and the proportionate relationship of blower fan electric current to obtain the corresponding blower fan electric current of production institute required airflow; Described detection module is used to detect the blower fan electric current, and when described blower fan electric current has reached the blower fan electric current of production institute required airflow correspondence, notifies described control module to keep current fan frequency converter output frequency constant.
In addition, the system that the two large flues of this realization sintering machine are regulated also can comprise: adjustment unit, be used for when the frequency converter output frequency of described control module 502 controls two blower fans replaces the stepping rising, detecting two blower fan electric currents, and adjusting the frequency converter output frequency according to the electric current of two blower fans.
In addition, the system that the two large flues of this realization sintering machine are regulated also can comprise: balancing unit, be used to detect two blower fan electric currents, and when wherein the electric current of a typhoon machine reduces suddenly, notify described control module 502 that the corresponding frequency converter output frequency of this blower fan is raise, till the electric current between the two typhoon machines reaches new balance.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the embodiment of the invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation of the spirit or scope that do not break away from the embodiment of the invention in other embodiments.Therefore, the embodiment of the invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method that realizes that the two large flues of sintering machine are regulated is characterized in that, comprising:
Production institute required airflow is set at the target air quantity of blower fan, and behind the air door of fan standard-sized sheet, starts blower fan;
The frequency converter output frequency of controlling two typhoon machines replaces stepping and rises;
After reaching the target air quantity, two typhoon machines keep current fan frequency converter output frequency constant.
2. method according to claim 1 is characterized in that, comes in the following manner to determine whether current fan delivery reaches the target air quantity:
Utilize the fan delivery and the proportionate relationship of blower fan electric current to obtain the corresponding blower fan electric current of production institute required airflow;
Detect the blower fan electric current, when described blower fan electric current has reached the blower fan electric current of production institute required airflow correspondence, determine that current fan delivery is the target air quantity.
3. method according to claim 1 is characterized in that, this method also comprises:
When the frequency converter output frequency of control two blower fans replaces the stepping rising, detect two blower fan electric currents, and adjust the frequency converter output frequency according to the electric current of two blower fans.
4. to go 3 described methods according to right, it is characterized in that, describedly adjust the frequency converter output frequency according to two blower fan electric currents and comprise:
When two fan frequency converter output frequencies equate, if two blower fan current imbalances, the frequency converter output frequency of then that electric current is less blower fan correspondence rises some hertz compared to the bigger fan frequency converter output frequency of electric current, till the electric current of two blower fans reaches balance; The less fan frequency converter output frequency step-lengths that rise of wherein said electric current are 1Hz more.
5. method according to claim 1 is characterized in that, this method also comprises:
Detect two blower fan electric currents,, then the corresponding frequency converter output frequency of this blower fan is raise, till the electric current between the two typhoon machines reaches new balance if wherein the electric current of a typhoon machine reduces suddenly.
6. according to any described method of claim 1 to 5, it is characterized in that:
The step-length that the frequency converter output frequency of described two typhoon machines replaces the stepping rising is 1Hz.
7. a system that realizes that the two large flues of sintering machine are regulated is characterized in that, comprising: unit, control module and processing unit are set; Wherein,
The described unit that is provided with is in order to being set at the target air quantity of blower fan with production institute required airflow, and is notified to described control module and processing unit, and starts blower fan behind the air door of fan standard-sized sheet;
Described control module in order to described the unit be set be provided with the target air quantity after, the frequency converter output frequency of controlling two typhoon machines replaces stepping and rises;
Described processing unit is in order to detecting the air quantity of two typhoon machines, and when described fan delivery reach described the target air quantity that the unit is provided with is set after, notify described control module to keep current fan frequency converter output frequency constant.
8. system according to claim 7 is characterized in that, described processing unit comprises: acquisition module and detection module; Wherein,
Described acquisition module is used to utilize the fan delivery and the proportionate relationship of blower fan electric current to obtain the corresponding blower fan electric current of production institute required airflow;
Described detection module is used to detect the blower fan electric current, and when described blower fan electric current has reached the blower fan electric current of production institute required airflow correspondence, notifies described control module to keep current fan frequency converter output frequency constant.
9. system according to claim 7, it is characterized in that this system also comprises: adjustment unit is used for replacing when stepping rises at the frequency converter output frequency that described control module is controlled two blower fans, detect two blower fan electric currents, and adjust the frequency converter output frequency according to the electric current of two blower fans.
10. system according to claim 7, it is characterized in that, this system also comprises: balancing unit, be used to detect two blower fan electric currents, and when wherein the electric current of a typhoon machine reduces suddenly, notify described control module that the corresponding frequency converter output frequency of this blower fan is raise, till the electric current between the two typhoon machines reaches new balance.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103017534A (en) * | 2012-12-27 | 2013-04-03 | 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 |
| CN103033055A (en) * | 2012-12-27 | 2013-04-10 | 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 |
| CN103185836A (en) * | 2011-12-27 | 2013-07-03 | 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 |
| 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 |
| CN104533818A (en) * | 2014-12-22 | 2015-04-22 | 大唐贵州发耳发电有限公司 | Automatic balance adjusting control system of parallel draught fans |
| 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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2009
- 2009-09-29 CN CN 200910178551 patent/CN102032787B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103185836A (en) * | 2011-12-27 | 2013-07-03 | 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 |
| 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 |
| CN103017534A (en) * | 2012-12-27 | 2013-04-03 | 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 |
| CN103033055A (en) * | 2012-12-27 | 2013-04-10 | 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 |
| 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 |
| CN104533818A (en) * | 2014-12-22 | 2015-04-22 | 大唐贵州发耳发电有限公司 | Automatic balance adjusting control system of parallel draught fans |
| 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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