CN103292312A - Method for controlling water level of steam pocket - Google Patents
Method for controlling water level of steam pocket Download PDFInfo
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- CN103292312A CN103292312A CN2013102566175A CN201310256617A CN103292312A CN 103292312 A CN103292312 A CN 103292312A CN 2013102566175 A CN2013102566175 A CN 2013102566175A CN 201310256617 A CN201310256617 A CN 201310256617A CN 103292312 A CN103292312 A CN 103292312A
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Abstract
The invention discloses a method for controlling the water level of a steam pocket. According to the method, a difference value of a water feeding quantity and a steam outputting quantity of the steam pocket in preset time is used as a current sewage draining quantity of the steam pocket, then a series of processing is carried out on a first water level value, the current water feeding quantity, the current steam outputting quantity and the current sewage draining quantity of the steam pocket, and an opening value of a feed water valve of the steam pocket is controlled according to processing results so as to adjust the water level of the steam pocket. Compared with the prior art, the method has the advantages that influences caused by the current sewage draining quantity of the steam pocket on the water level of the steam pocket are considered, therefore, in the process of adjusting the water level of the steam pocket, the difference value of the total water feeding quantity and the total steam outputting quantity of the steam pocket in the preset time is used as the current sewage draining quantity of the steam pocket, the water level of the steam pocket is adjusted according to the current sewage draining quantity of the steam pocket, and accuracy in controlling the water level of the steam pocket is improved.
Description
Technical field
The present invention relates to automation field, relate in particular to a kind of method for controlling water level of drum.
Background technology
Drum is to carry out the device that carbonated drink is separated in the boiler, has a large amount of steam water interfaces in the drum.The water level of drum is too high, can influence the effect that carbonated drink is separated, cause excess moisture in the steam of drum outlet and make boiler cross hot gas wall duct ligation dirt, the superheater temperature of boiler is sharply changed, directly influence security and the economy of unit.The water level of drum is crossed the low water circulation that then may destroy boiler, causes the water screen tube of boiler to burn out and breaks.Therefore, the water level of keeping boiler-steam dome normally is the necessary condition that guarantees safe operation of the boiler.
The normal three momentum method for controlling water level that adopt of traditional The Water Level Control of Steam method namely by the monitoring to the water level value of the steam output quantity of the confluent of drum, drum and current drum, are realized the control to the water-supply valve of drum, thereby are regulated the water level of drum.Yet owing to the factor that influences the water level of drum not merely is the water level value of confluent, steam output quantity and the drum of current drum, thereby three momentum control methods are low to the control accuracy of steam water-level.
Summary of the invention
In view of this, the invention discloses a kind of method for controlling water level of drum, to improve the precision of The Water Level Control of Steam.
For achieving the above object, the invention provides following technical scheme:
A kind of method for controlling water level of drum comprises:
Obtain first water level value of drum, current confluent and current steam output quantity;
Calculate the poor of described first water level value and preset water level value, and the difference of described first water level value and preset water level value is carried out the PID computing, obtain a PID output valve;
Determine the current blowdown flow rate of described drum, wherein, described current blowdown flow rate is that give water inventory and the steam of described drum is exported the poor of total amount in the Preset Time;
With a described PID output valve, described current steam output quantity and described current blowdown flow rate and as default confluent;
Calculate the poor of described default confluent and described current confluent, and the difference of described default confluent and described current confluent is carried out the PID computing, obtain the 2nd PID output valve;
According to described the 2nd PID output valve, regulate the opening value of water-supply valve, thus the water level of control drum, the opening value of wherein said water-supply valve characterizes the size in the water outlet cross section of described water-supply valve.
Preferably, described first water level value that obtains drum comprises:
A, obtain a plurality of level measuring values of drum, wherein said a plurality of level measuring values repeatedly measure;
The mean value of B, the described a plurality of level measuring values of calculating;
C, judge each described level measuring value and described mean value difference whether all in preset range, if, then with described mean value as described first water level value; If not, then from described a plurality of level measuring values, determine and the difference of the described mean value a plurality of level measuring values in described preset range, and to that determine and a plurality of level measuring values of difference described mean value in described preset range, carry out described step B, until definite described first water level value.
Preferably, with described mean value as described first water level value before, also comprise:
Judge that the difference of each described level measuring value is whether in preset range;
When the difference of judging each described level measuring value during in preset range, with described mean value as described first water level value;
When the difference of judging each described level measuring value during not in preset range, the measurement of then determining described water level occurs unusual, and output alarm signal.
Preferably, described method also comprises:
When the opening value of described the 2nd PID output valve and described water-supply valve is unequal in judging default duration, then determine described water-supply valve fault, and output alarm signal.
Preferably, after obtaining described current confluent, also comprise:
Judge whether described current confluent exists measurement unusual, when described current confluent exists measurement unusual, and output alarm signal;
Wherein, describedly judge whether described current confluent exists measurement to comprise unusually:
Whether the opening value of judging described current confluent and described water-supply valve satisfies default functional relation, and whether the difference of described current confluent and described steam output quantity exceeds preset range;
When the opening value of described current confluent and described water-supply valve does not satisfy the preset function relation, and the difference of described current confluent and described current steam output quantity is when exceeding preset range, determines that described current confluent exists to measure unusually.
Preferably, described method also comprises:
When the opening value of described current confluent and described water-supply valve does not satisfy the preset function relation, and the difference of described confluent and described steam output quantity determines described water-supply valve fault when not exceeding preset range, and output alarm signal.
Preferably, after obtaining described current steam output quantity, also comprise:
Judge whether described current steam output quantity exists measurement unusual, when described current steam output quantity exists measurement unusual, output alarm signal;
Wherein, describedly judge whether described current steam output quantity exists measurement to comprise unusually:
Whether the opening value of judging described current confluent and described water-supply valve satisfies the preset function relation, and whether the difference of described current confluent and described steam output quantity exceeds preset range;
When the opening value of described current confluent and described water-supply valve satisfies the preset function relation, and the difference of described current confluent and described current steam output quantity is when exceeding preset range, determines that described current steam output quantity exists to measure unusually.
Preferably, described method also comprises: when the measurement of the measurement of the measurement of described first water level value, described current confluent and described current steam output quantity just often, judge that the difference of steam water-level value after regulating and described preset water level value is whether in preset range;
If not, determine that then a described PID output valve and/or described the 2nd PID output valve are unusual, send alarm signal;
If determine that then a described PID output valve and described the 2nd PID output valve are normal.
Via above technical scheme as can be known, compared with prior art, the invention discloses a kind of method for controlling water level of drum.This method by with drum in Preset Time confluent and the difference of steam output quantity as the blowdown flow rate of current drum, and then first water level value of drum, current confluent, current steam output quantity and current blowdown flow rate carried out a series of processing, and according to the opening value of result control drum water-supply valve, to realize the adjusting to the water level of drum.With respect to prior art, the present invention has considered that the current blowdown flow rate of drum is to the influence of the water level of drum, thereby when regulating the water level of drum, with the difference of the total confluent of drum in Preset Time and the total steam output quantity blowdown flow rate as current drum, and according to the blowdown flow rate of drum the water level of drum is regulated, improved the The Water Level Control of Steam precision.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 shows the schematic flow sheet of an embodiment of the method for controlling water level of a kind of drum of the present invention;
Fig. 2 shows the schematic flow sheet that obtains an embodiment of first water level value in the method for controlling water level of a kind of drum of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Show the schematic flow sheet of an embodiment of the method for controlling water level of a kind of drum of the present invention referring to Fig. 1.In the present embodiment, this method comprises:
101: obtain first water level value of drum, current confluent and current steam output quantity.
First water level value of drum, current confluent and current steam output quantity are three factors that influence steam water-level.Obtain the instantaneous value in the above a certain moment of parameter value by corresponding measuring instrument, such as: by limnograph, confluent meter and steam output quantity meter, obtain first water level value of drum, current confluent and current steam output quantity.
Wherein, when obtaining current steam output quantity, usually steam output quantity meter is arranged on Boiler Steam house steward's position, thereby this current steam output quantity steam output quantity that is drum.
102: calculate the poor of described first water level value and preset water level value, and the difference of described first water level value and preset water level value is carried out the PID computing, obtain a PID output valve.
Wherein, the preset water level value of this drum is the steam water-level value under the safe operation of the boiler state.Because boiler-steam dome model difference, the preset water level value of different boilers also can be different.And then, calculate the poor of first water level value and this preset water level value, and resulting this difference is carried out the PID computing.
Wherein, PID(Proportion Integration Differentiation) computing is also referred to as pid calculation, and it is widely used in automation control area.This calculating process can utilize computer software programs to finish, and also can finish by corresponding hardware facility, such as the PID controller.
The PID controller is backfeed loop parts common in Industry Control Application.This controller compares first water level value and the preset water level value that collect, utilizes difference to calculate the corresponding PID output valve of output then.
In addition, in the operating process of reality, for fear of the too situation generation of frequent adjustment water-supply valve.After the preset water level value of actual set drum, can set a dead band, i.e. a value range for this preset water level value usually.Such as: this preset water level value is set 30mm, and value range is set at ± 10mm, when having only first water level value when drum greater than 40mm or less than 20mm, just first water level value of drum is regulated.
103: determine the current blowdown flow rate of drum, wherein, described current blowdown flow rate is that give water inventory and the steam of described drum is exported the poor of total amount in the Preset Time.
In to boiler drum level control, those skilled in the art finds that except first water level value of drum, current confluent and three factors of current steam output quantity, the blowdown flow rate of boiler also has very big influence to steam water-level.
Yet because the blowdown of boiler is divided into continuous blowdown and not timing blowdown, generally can't directly obtain the current instantaneous blowdown flow rate of boiler by measuring instrument.In the present invention with the difference of giving water inventory and steam total amount in Preset Time as current instantaneous blowdown flow rate.Wherein, optional, this Preset Time can be set to preceding 1 hour of current time.
104: with a described PID output valve, described current steam output quantity and described current blowdown flow rate and as default confluent.
The steam and the refuse that produce in the process of the operation of boiler go out boiler by corresponding tubes rows, thereby cause the water level of drum to descend, for the water level of keeping drum is normal, and usually need be to the inner feedwater of boiler-steam dome.For the water level that can guarantee boiler is normal, the default confluent of boiler-steam dome should equal poor, the current steam output quantity of this first water level value and preset water level value and current blowdown flow rate three's summation.Wherein, for optimization process, generally adopt a PID output valve to replace the poor of first water level value and preset water level value.
105: calculate the poor of described default confluent and described current confluent, and the difference of described default confluent and described current confluent is carried out the PID computing, obtain the 2nd PID output valve.
Because may there be gap in default confluent and current confluent, thereby when the water level of drum is controlled, need according to presetting the poor of confluent and current confluent the water level of drum to be regulated.In the process of practical operation, in order more accurately regulating through row the water level of drum, usually the difference of default confluent and current confluent to be carried out the PID computing, and to adopt the PID operation result to replace the poor of default confluent and current confluent.
106: according to described the 2nd PID output valve, regulate the opening value of water-supply valve, thus the water level of control drum, the opening value of wherein said water-supply valve characterizes the size in the water outlet cross section of described water-supply valve.
According to the 2nd PID output valve, regulate the opening value of water-supply valve.When the opening value of water-supply valve was more big, the confluent of water-supply valve was more big, opening value more hour, confluent is more little, thus the confluent of controller water-supply valve the water level of drum is regulated realizing, make steam water-level reach the preset water level value.
By above-described embodiment as can be known, the invention discloses a kind of Water Level Control method of drum.This method by with drum in Preset Time confluent and the difference of steam output quantity as the blowdown flow rate of current drum, and then first water level value of drum, current confluent, current steam output quantity and current blowdown flow rate carried out a series of processing, and according to the opening value of result control drum water-supply valve, to realize the adjusting to the water level of drum.With respect to prior art, the present invention has considered that the current blowdown flow rate of drum is to the influence of the water level of drum, and when regulating the water level of drum, with the difference of the total confluent of drum in Preset Time and the total steam output quantity blowdown flow rate as current drum, and according to the blowdown flow rate of drum the water level of drum is regulated, improved the The Water Level Control of Steam precision.
When obtaining first water level value, operating personnel can be used as first water level value with the measured value of a limnograph, also the measured value of a plurality of limnographs can be used as first water level value after treatment.With respect to first water level value that a limnograph is determined, first water level value that a plurality of water level meters are determined is more accurate.
The limnograph of boiler-steam dome adopts equalizing reservoir water level meter usually at present, and every boiler all is equipped with a plurality of limnographs.In the prior art, choose the value of a water level meter in a plurality of water level meters usually as first water level value, and control the adjusting of water level according to the water level value of choosing.Yet, when this water level meter breaks down, when measured water level value is unusual, will cause the adjusting mistake of water level, make actual water level value too high or too low.
In order to reduce the as above generation of situation.Further, show the schematic flow sheet that obtains an embodiment of first water level value in the control method of a kind of steam water-level of the present invention referring to Fig. 2.This method comprises:
201: obtain a plurality of level measuring values of drum, wherein said a plurality of level measuring values repeatedly measure.
The process of obtaining the level measuring value among this process and Fig. 1 embodiment is identical, also obtains water level value by a plurality of limnographs.
202: the mean value that calculates described a plurality of level measuring values.
203: judge that the difference of each described level measuring value and described mean value is whether all in preset range.If then execution in step 204; If not, execution in step 205 then.
Judge that one by one the difference of each level measuring value and this mean value is whether in default scope.Such as: preset range is 0-20mm, when the difference of certain level measuring value and this mean value during greater than 30mm, determines that then the difference of this level measuring value and this mean value has exceeded preset range.
204: with described mean value as described first water level value.
When the difference of all level measuring values and this mean value is all in default scope, illustrate that then all level measuring values are no abnormal, and with this mean value as first water level value.
205: from described a plurality of level measuring values, determine and the difference of the described mean value a plurality of level measuring values in described preset range, and a plurality of level measuring values of determining are continued execution in step 202, until definite described first water level value.
When the difference of certain or certain a few level measuring values and the mean value of determining according to them has exceeded default scope, illustrate that this level measuring value is unusual, thereby this level measuring value can not participate in follow-up water level and regulates.And then the level measuring value that these are unusual is rejected, and the remaining a plurality of level measuring values that meet the demands are continued circulation execution in step 202, all meets the demands until all level measuring values.This moment the mean value of all level measuring values of meeting the demands as first water level value.
In order further to improve the accuracy of first water level value, with described mean value as first water level value before, also comprise:
Judge that the difference of each described level measuring value is whether in preset range.When the difference of judging each described level measuring value during in preset range, with described mean value as described first water level value.When the difference of judging each described level measuring value during not in preset range, the measurement of then determining described water level occurs unusual, and output alarm signal.After there was the unusual also output alarm signal of measurement in definite water level value, the adjustment process of this water level withdrawed from automatically, and this moment, operating personnel can regulate water level by artificial mode.
In the process to The Water Level Control of Steam; hardware unit usually can break down; thereby to The Water Level Control of Steam the time; need some information in the real-time collection control procedure; and judge according to the information that collects whether some parts of boiler produce fault; thereby in time fault is handled, guaranteed the safe operation of boiler.
Further, this method also comprises: when judging that described the 2nd PID output valve is unequal with the opening value of described water-supply valve in default duration, and then definite described water-supply valve fault, and output alarm signal.
Under normal circumstances, water-supply valve is according to the opening value of the 2nd PID output valve control self, and the 2nd PID output valve equates with the opening value of water-supply valve usually.Yet when in a certain period, namely in the default duration, when the 2nd PID output valve is not equal to the opening value of water-supply valve, determine the fault that this water-supply valve occurs, and output alarm signal, handle to remind operating personnel.
Further, in above-mentioned arbitrary embodiment, after obtaining current confluent, this method also comprises:
Judge that whether current confluent exists measurement unusual, when described current confluent exists measurement unusual, sends alarm signal.
Wherein, judge whether current confluent comprises unusually:
Whether the opening value of judging current confluent and water-supply valve satisfies the preset function relation, and whether the difference of current confluent and steam output quantity exceeds preset range.
The opening value of current confluent and water-supply valve does not satisfy and the preset function relation, and the difference of current confluent and current steam output quantity is when exceeding preset range, determines that current confluent exists to measure unusually.
The opening value of current confluent and water-supply valve does not satisfy preset function relation, and current confluent and current steam output quantity do not exceed preset range the time, determine the water-supply valve fault, and output alarm signal.
Under normal circumstances, the linear functional relation of the opening value of current confluent and water-supply valve, namely the opening value of water-supply valve is more big, and current confluent is more big.The confluent that a certain moment is obtained and the opening value of water-supply valve are brought default linear function into.If both members equates, illustrate that then the opening value of this confluent and water-supply valve satisfies linear function, if both members is unequal, illustrate that then the opening value of confluent and water-supply valve does not satisfy linear function.When the opening value of certain confluent constantly and water-supply valve does not satisfy this default linear functional relation, may be that the measurement of confluent occurs unusually, also may be water-supply valve breaks down.This moment current steam output quantity as a reference value, if when the difference of current confluent and current steam output quantity has exceeded default scope, is determined then that current confluent exists to measure unusually.
Further, in above-mentioned arbitrary embodiment, after obtaining described current steam output quantity, this method also comprises:
Judge that whether described current steam output quantity exists measurement unusual, when described current steam output quantity exists measurement unusual, sends alarm signal.
Wherein, judge whether described current steam output quantity comprises unusually:
Judge whether functional relation and preset function relation between the opening value of described current confluent and described water-supply valve be identical, and whether the difference of described current confluent and described steam output quantity exceeds preset range.
Functional relation and preset function between the opening value of described current confluent and described water-supply valve are identical, and the difference of described current confluent and described current steam output quantity determines that the measurement of described current steam output quantity occurs unusual when exceeding preset range.
When the functional relation between the measured value of current confluent and the opening value of water-supply valve is identical with default functional relation, prove that then the measurement of current confluent and water-supply valve are all normal.And the difference of current confluent and current steam output quantity exceeds preset range, proves it may is that current confluent is measured appearance unusually, also may be that current steam output quantity measurement occurs unusual.In conjunction with above-mentioned judgement to functional relation between current confluent and the water-supply valve opening value, can determine that then the measurement of current steam output quantity occurs unusual.
Further, this method also comprises: when the measurement of the measurement of the measurement of described first water level value, described current confluent and described current steam output quantity just often, judge that the difference of steam water-level value after regulating and preset water level value is whether in preset range.If the steam water-level value after regulating and the difference of preset water level value not in preset range, determine then that a described PID output valve and/or described the 2nd PID output valve are unusual, and output alarm signal.If the steam water-level value after regulating is when the difference of preset water level value is in preset range, then a definite described PID output valve and described the 2nd PID output valve are normal.
In the operating process of reality because boiler is in the state of operation all the time, the time be carved with refuse and steam is discharged.Thereby the steam water-level value after overregulating can not be equal to the preset water level value, has certain deviation between the two.If in the measurement of first water level value, current confluent, current steam output quantity all under the normal prerequisite, if the deviation of the steam water-level value after overregulating and preset water level value has exceeded default scope, such as preset range be ± 30mm, then can determine in adjustment process, in the one PID output valve and the 2nd PID output valve one or two have all occurred calculating unusual, that is to say that fault has appearred in some or two hardware units that participate in calculating the one PID output valve and the 2nd PID output valve.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments herein.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. the method for controlling water level of a drum is characterized in that, comprising:
Obtain first water level value of drum, current confluent and current steam output quantity;
Calculate the poor of described first water level value and preset water level value, and the difference of described first water level value and preset water level value is carried out the PID computing, obtain a PID output valve;
Determine the current blowdown flow rate of described drum, wherein, described current blowdown flow rate is that give water inventory and the steam of described drum is exported the poor of total amount in the Preset Time;
With a described PID output valve, described current steam output quantity and described current blowdown flow rate and as default confluent;
Calculate the poor of described default confluent and described current confluent, and the difference of described default confluent and described current confluent is carried out the PID computing, obtain the 2nd PID output valve;
According to described the 2nd PID output valve, regulate the opening value of water-supply valve, thus the water level of control drum, the opening value of wherein said water-supply valve characterizes the size in the water outlet cross section of described water-supply valve.
2. method according to claim 1 is characterized in that, described first water level value that obtains drum comprises:
A, obtain a plurality of level measuring values of drum, wherein said a plurality of level measuring values repeatedly measure;
The mean value of B, the described a plurality of level measuring values of calculating;
C, judge each described level measuring value and described mean value difference whether all in preset range, if, then with described mean value as described first water level value; If not, then from described a plurality of level measuring values, determine and the difference of the described mean value a plurality of level measuring values in described preset range, and to that determine and a plurality of level measuring values of difference described mean value in described preset range, carry out described step B, until definite described first water level value.
3. method according to claim 2 is characterized in that, with described mean value as described first water level value before, also comprise:
Judge that the difference of each described level measuring value is whether in preset range;
When the difference of judging each described level measuring value during in preset range, with described mean value as described first water level value;
When the difference of judging each described level measuring value during not in preset range, the measurement of then determining described water level occurs unusual, and output alarm signal.
4. method according to claim 1 is characterized in that, described method also comprises:
When the opening value of described the 2nd PID output valve and described water-supply valve is unequal in judging default duration, then determine described water-supply valve fault, and output alarm signal.
5. method according to claim 1 is characterized in that, after obtaining described current confluent, also comprises:
Judge whether described current confluent exists measurement unusual, when described current confluent exists measurement unusual, and output alarm signal;
Wherein, describedly judge whether described current confluent exists measurement to comprise unusually:
Whether the opening value of judging described current confluent and described water-supply valve satisfies default functional relation, and whether the difference of described current confluent and described steam output quantity exceeds preset range;
When the opening value of described current confluent and described water-supply valve does not satisfy the preset function relation, and the difference of described current confluent and described current steam output quantity is when exceeding preset range, determines that described current confluent exists to measure unusually.
6. method according to claim 5 is characterized in that, described method also comprises:
When the opening value of described current confluent and described water-supply valve does not satisfy the preset function relation, and the difference of described confluent and described steam output quantity determines described water-supply valve fault when not exceeding preset range, and output alarm signal.
7. method according to claim 5 is characterized in that, after obtaining described current steam output quantity, also comprises:
Judge whether described current steam output quantity exists measurement unusual, when described current steam output quantity exists measurement unusual, output alarm signal;
Wherein, describedly judge whether described current steam output quantity exists measurement to comprise unusually:
Whether the opening value of judging described current confluent and described water-supply valve satisfies the preset function relation, and whether the difference of described current confluent and described steam output quantity exceeds preset range;
When the opening value of described current confluent and described water-supply valve satisfies the preset function relation, and the difference of described current confluent and described current steam output quantity is when exceeding preset range, determines that described current steam output quantity exists to measure unusually.
8. method according to claim 7, it is characterized in that, described method also comprises: when the measurement of the measurement of the measurement of described first water level value, described current confluent and described current steam output quantity just often, judge that the difference of steam water-level value after regulating and described preset water level value is whether in preset range;
If not, determine that then a described PID output valve and/or described the 2nd PID output valve are unusual, send alarm signal;
If determine that then a described PID output valve and described the 2nd PID output valve are normal.
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| CN108444053A (en) * | 2017-02-14 | 2018-08-24 | 阿里巴巴集团控股有限公司 | The control system of air-conditioning and the control method of running state of air conditioner |
| CN108916852A (en) * | 2018-05-18 | 2018-11-30 | 河南华润电力古城有限公司 | A kind of virtual protection method based on boiler vapor liquid level |
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| CN104456522B (en) * | 2013-09-24 | 2016-06-01 | 宝山钢铁股份有限公司 | Multi fuel boiler drum level bias adjustment method |
| CN104073590A (en) * | 2014-07-11 | 2014-10-01 | 济钢集团有限公司 | Method for controlling liquid level of steam pocket in smelting by converter |
| CN104073590B (en) * | 2014-07-11 | 2016-03-30 | 济钢集团有限公司 | A kind of converter smelting liquid level of steam drum control method |
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| CN108444053B (en) * | 2017-02-14 | 2021-05-18 | 阿里巴巴集团控股有限公司 | Control system of air conditioner and control method of air conditioner running state |
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