CN102312040B - Four-impulse control method for steam drum water level of converter - Google Patents
Four-impulse control method for steam drum water level of converter Download PDFInfo
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Abstract
The invention discloses a four-impulse control method for a steam drum water level of a converter. On the basis of the conventional three-impulse control, a smelting signal is added, a water replenishing amount is calculated according to a set oxygen blowing amount, and water replenishing time control is introduced, so that water is replenished to a steam drum in advance, and the phenomenon that the supplied water is not sufficient because the loading amount of a loading section is too large is avoided; therefore, the false water level of the steam drum is reduced. Moreover, the optimized control over steam of the steam drum is improved, so the amount of water overflowing along with steam is reduced.
Description
Technical field
The present invention relates to the steelmaking converter production technology, more particularly, relate to a kind of four impulse control methods of steam drum water level of converter.
Background technology
Steam water-level is the important parameter of guaranteeing converter safety in production and feedwater, and for the modern advanced steelworks of controlling, the drum pondage fluctuation of permission is also more and more less, therefore must strictly control water level within specialized range.Steam water-level has reflected the equilibrium relation of load and feedwater, and the too high meeting of steam water-level causes water entrained by steam to affect steam-water separation effect; Water level is crossed the low destruction that can cause the drum water circulation, water is all vaporized burn out steamdrum even blast.Affect the factor of steam water-level except this regular element of heating vaporization, also have these two factors of fluctuation of steam load and feedwater flow.When load increases rapidly, drum pressure reduces rapidly, and water will sharply be vaporized, and a large amount of bubbles occur, finally can form " false water level ".
Existing drum control mode generally is divided into three kinds:
1, single water level control model is only controlled the water yield by detecting the drum actual water level.
2, doublepulse water level control model detects drum actual water level, steam flow, and steam flow as feed-forward signal, is formed the control mode of feed-forward and feedback with steam water-level.
3, three momentum control models, steam water-level is controlled variable, it is main momentum signal, steam flow and feedwater flow are that auxiliary momentum signal is under steady state (SS), the level measuring signal equals set-point, the output of water-level regulator, three signals such as steam flow and feedwater flow, the output current that obtains by totalizer is: I
0=K
1I
1-K
2I
2+ K
3I
3, in the formula, I
1Output current for water-level regulator; I
2Electric current for the steam flow transmitter; I
3Electric current for the feedwater flow transmitter; K
1, K
2, K
3Be respectively the attenuation coefficient of each passage of totalizer.
At present, the three momentum control models that generally all adopt than relatively large boiler system.The more other two kinds of control models of three momentum control models, steam flow and feedwater flow signal controlling have been increased, steam flow is feed-forward signal, and its effect is to prevent from producing wrong action, the quality of regulation when improving the steam flow disturbance owing to " false water level " makes regulator; Two Signal cooperations of steam flow and feedwater flow can be eliminated the static deviation of system.Feedwater flow makes regulator just can not make adjustment process stable according to disturbing in the feed-forward signal elimination when water level also changes as feedback signal, plays the effect of stablizing feedwater flow.But three momentums are controlled on the larger steelmaking converter drum control system of duty factor and use, and still can't avoid the generation of false water level.This is because mainly be oxidation reaction when making steel early stage, quick heating, cooling water consumption is large, the drum load is large, and easily vaporization, causes interior pressure large, contain a large amount of bubbles in the water, if drum is controlled to be the three momentums control of pure water position, insufficient water will appear, produce easily " false water level " phenomenon.The appearance of false water level, the false declaration that can bring the alerting signal of water level causes the termination situation of smelting sometimes because signal is chain; Simultaneously; the appearance of false water level is that the moisturizing information of three momentums control has been brought misleading, often can occur because smelting load large; drum internal pressure fast rise; false water level is fast rise also, and this moment, water consumption was large in fact, needs timely moisturizing; and because of the rising of false water level; cause water level in time not catch up with, the phenomenon of low-water level, enrich the water deficiency therefore occurs sometimes, finally cause to smelt to stop.
Summary of the invention
For the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of four impulse control methods of steam drum water level of converter, in order to reduce the generation of drum false water level, avoid occuring drum and mend hydropenic phenomenon.
For achieving the above object, the present invention adopts following technical scheme:
Four impulse control methods of this steam drum water level of converter comprise that receiving the smelting signal shifts to an earlier date the step of moisturizing and the step of steam water-level three momentums control to drum, and wherein, in advance moisturizing comprises the circulation step of following A to D:
A. when the waiting status of converter, control drum intake pump is opened, and the water inlet stop valve cuts out, and the inlet regulating valve aperture is 5～20%;
B. when the heat of converter began, calculating shifted to an earlier date rate of water make-up and carries out moisturizing according to blowing oxygen quantity;
C. before the smelting of converter begins, detect the drum actual water level and carry out the water level compensation;
D. when the smelting of converter finishes, according to actual water level water level is adjusted to standby water level section H1～H3, and closes into the water stop valve.
The concrete steps of described step B are as follows:
B1. set up the in advance relational expression of rate of water make-up according to the blowing oxygen quantity of setting;
B2. calculate the in advance moisturizing time according to the relational expression that shifts to an earlier date rate of water make-up;
B3. moisturizing time and the actual moisturizing time that calculates is compared, and then the switch of control water inlet stop valve.
In the in advance relational expression of rate of water make-up described in the step B1 be:
Q
Water=KQ
Oxygen,
L
ActualS+FMt 〉=KQ
Oxygen+ L
MinimumS,
In the formula, Q
WaterBe water consumption, Q
OxygenBe the blowing oxygen quantity of setting, K is coefficient, L
ActualDrum actual water level when beginning for heat, L
MinimumBe the lowest water level that drum must store, S is the drum horizontal cross-sectional area, and F is the design discharge of drum inlet regulating valve, and M is the aperture of inlet regulating valve, and t is for shifting to an earlier date the moisturizing time.
In the in advance computing formula of moisturizing time described in the step B2 be:
T=[KQ
Oxygen-(L
Actual-L
Minimum) S]/(FM)+t
0
In the formula, Q
OxygenBe the blowing oxygen quantity of setting, K is coefficient, L
ActualBe drum actual water level this moment, L
MinimumBe the lowest water level that drum must store, S is the drum horizontal cross-sectional area, and F is the design discharge of drum inlet regulating valve, and M is the aperture of inlet regulating valve, and t is for shifting to an earlier date the moisturizing time, t
0Be the time margin of setting.
In step B3,
If during t≤T, close into the water stop valve, stop moisturizing;
If during t＞T, then continue moisturizing, until T=t stops moisturizing;
If t≤0 o'clock represents the smelting of enough this heats of water cut of present drum, need not moisturizing;
If t＞0 o'clock is then opened the moisturizing stop valve, and the moisturizing variable valve is opened to 80～100% aperture, carry out the moisturizing timing, make T be added to t since 0 after, finish moisturizing;
Above-mentioned t is for shifting to an earlier date the moisturizing time, and T is the actual moisturizing time.
In the moisturizing process, if water level reaches drum when stopping discharge level H2, then stop to supply water, and record the time t of moisturizing
1And when the smelting stage, water level decline occured, continue moisturizing, moisturizing time this moment is from t
1After beginning to be added to t, finish moisturizing.
In step C,
If the L that detects
ActualDuring≤L0, open into the water stop valve, carry out moisturizing to L
ActualStop behind＞the L0 and begin smelting;
If the L that detects
ActualDuring 〉=H3, open blowoff valve, carry out draining to L
ActualStop behind＜the H2 and begin smelting;
If the L0＜L that detects
ActualDuring＜H3, when beginning to smelt, continue to carry out moisturizing according to t, behind T=t, switch to steam water-level three momentums control step, carry out PID by the preset water level of reality and pressure and automatically regulate;
Above-mentioned L
ActualFor smelting the front drum actual water level of beginning, L0 is the drum lower limit water level that reaches smelting condition, and H3 is the drum upper limit water level that reaches smelting condition, and H2 is that drum stops discharge level.
The method also comprises the step e of drum Steam Recovery control, comprising:
E1. set respectively low pressure limit value P1, PID controlled pressure value P2 and the upper pressure limit value P3 of drum steam;
E2. detect in real time the actual pressure value P of drum, and compare with each value among the E1, to control Steam Recovery:
If during P1＜P＜P2, shift to an earlier date slow recovered steam by the control of Steam Recovery valve;
If during P2≤P＜P3, carry out recovered steam by the PID control of pressure;
If during P 〉=P3, carry out mechanical self-pressing type and diffuse.
In technique scheme, four impulse control methods of steam drum water level of converter of the present invention are on the basis of existing three momentums control, add and smelt signal, calculate rate of water make-up by the blowing oxygen quantity of setting, and introduce the control of moisturizing time and then be the drum moisturizing in advance, avoided the insufficient water phenomenon occurring because of the time increase of load patch, thereby reduced the generation of drum false water level.In addition, also increase the optimal control to the drum Steam Recovery, thereby reduced the excessive amount of water with steam.
Description of drawings
Fig. 1 is the structural representation of steam drum water level of converter control system of the present invention;
Fig. 2 is the Water Level Control of Steam synoptic diagram of the present invention;
Fig. 3 is the process flow diagram of four impulse control methods of steam drum water level of converter of the present invention;
Fig. 4 is drum Steam pressure control synoptic diagram of the present invention.
Fig. 5 is the process flow diagram that shifts to an earlier date the moisturizing Time Calculation and relatively control of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
See also shown in Figure 1ly, Fig. 1 is the structural representation of steam drum water level of converter control system, and wherein 1 is drum, and 8 is the drum intake pump, and 2 are the water inlet stop valve, and 3 is inlet regulating valve, and 4 is blowoff valve, and 5 is the Steam Recovery valve, and 6 is the steam releasing valve, and 7 is the steam supply valve.
See also shown in Figure 2, L among Fig. 2
ActualFor smelting the front drum actual water level of beginning, L0 is the drum lower limit water level that reaches smelting condition, and H3 is the drum upper limit water level that reaches smelting condition, and H2 is that drum stops discharge level, and H1 is standby lower limit water level, and H4 is high alarm water level, and L1 is low alarm water level.
Please consult again shown in Figure 3, four impulse control methods of steam drum water level of converter of the present invention are on the basis of existing three momentums control, increased and receive to have smelted signal (be that converter wait, heat begin, smelting begins and smelt end) and to the step that drum shifts to an earlier date moisturizing, specifically comprise the circulation step of following A to D:
A. when the waiting status of converter, control drum intake pump 8 is opened, and water inlet stop valve 2 cuts out, and inlet regulating valve 3 apertures are 5～20%;
B. when the heat of converter began, calculating shifted to an earlier date rate of water make-up and carries out moisturizing according to blowing oxygen quantity;
C. before the smelting of converter begins, detect the drum actual water level and carry out the water level compensation;
D. when the smelting of converter finishes, according to actual water level water level is adjusted to standby water level section H1～H3, and closes into water stop valve 2.
The below carries out the concrete example explanation to above watering step:
One, waiting status
Converter is when waiting status, each equipment of control boiler system keeps following state: intake pump 8 has been opened, water inlet stop valve 2 cuts out, and inlet regulating valve 3 apertures are in 5～20% standby condition, default variable valve 3 apertures be for the two limit pressure reduction that reduce variable valve 3 unsuitable excessive, prevent from causing spool to damage, prolong the serviceable life of variable valve 3, guarantee that steam water-level is interval at H1～H3 this moment, can establish H1=+100mm, H3=+500mm, drum flow of inlet water are 0Nm
3/ h.
Two, heat begins
Please in conjunction with shown in Figure 5, standby ready when the one heat steel level, need operating personnel this moment on operation screen, according to the smelting demand of this stove molten steel, sets corresponding Converter Oxigen Blowing amount, and " heat begins " signal on the clicking operation picture.In case " heat begins " signal is excited, program is calculated the accumulation blowing oxygen quantity zero clearing of reality simultaneously the in advance rate of water make-up that needs, and then is calculated the in advance moisturizing time, shifts to an earlier date moisturizing control: namely first according to setting blowing oxygen quantity Q
Oxygen, with reference to blowing oxygen quantity and water consumption the relationship between quantities, can calculate the relational expression of needed rate of water make-up, and then according to the designed capacity of drum, determine in advance moisturizing time t, the calculating of t of this moisturizing time is achieved as follows:
Generally speaking, load (blowing oxygen quantity Q
Oxygen) and water consumption Q
WaterA corresponding relation is arranged each other, be Q
Water=KQ
Oxygen, K is coefficient value, the K value can comprehensively be determined according to drum designed capacity and actual applied statistics situation.
If the horizontal cross-sectional area of drum is S, the actual water level that drum detects at present is L
Actual, the lowest water level that drum must store is L
Minimum, the design discharge of drum moisturizing variable valve 3 is F, and the aperture of variable valve 3 is M, and the in advance moisturizing time that needs is t, concerns each other as follows:
The minimum water yield that stores of the existing water yield+rate of water make-up of drum 〉=water consumption+drum
Be L
ActualS+FMt 〉=KQ
Oxygen+ L
MinimumS,
Be t 〉=[KQ
Oxygen-(L
Actual-L
Minimum) S]/(FM),
Therefore can set t=[KQ
Oxygen-(L
Actual-L
Minimum) S]/(FM)+t
0, t in the formula
0It is a time margin of setting according to actual conditions.
Example, existing supposition: Q oxygen=8000Nm
3, Q
Water=24Nm
3, K=0.003, S=15m
2, L
Real The border=+100cm, L
Minimum=-450mm, F=60Nm
3/ h, M=100%, t 〉=[0.003 * 8000-(0.1+0.45) * 15]/(60 * 100%) then, t 〉=0.2625h, i.e. t 〉=15.75min is if establish t
0=2min then can calculate t=17.75min.
Behind definite moisturizing time t, when beginning, heat begins moisturizing and timing T; Then in advance moisturizing time t and the actual moisturizing time T Relations Among that relatively calculate: if t≤T closes into water stop valve 2, stop moisturizing; If during t＞T, then continue moisturizing, until behind the T=t, stop moisturizing, then the Water Level Control of Steam is switched to three momentums control step, carry out PID by preset water level, the pressure of reality and automatically regulate (according to different time quantum t, might be during T=t before smelting beginning, also might be after entering the smelting stage).If it is noted that simultaneously t≤0, represent the smelting of enough this heats of water cut of present drum, do not need moisturizing; If the moisturizing stop valve is then opened in t＞0, and moisturizing variable valve 3 is opened to 80～100% aperture, and the beginning timing, actual moisturizing time T adds up since 0, has arrived t after the time, finishes moisturizing.In the process of moisturizing, in case when steam water-level reaches H2, then stop to supply water, to record the time t1 of moisturizing this moment, and then when smelting water level decline, continue moisturizing, moisturizing time this moment then begins to add up from t1, after beginning to be added to t, finishes moisturizing.
In addition, consider that change can appear according to the more change of the smelting information of reality in the blowing oxygen quantity of setting, therefore, the blowing oxygen quantity that can set by intermittent scanning is if find to have change, again by above flow process, according to the setting blowing oxygen quantity Q after the change
Oxygen' calculate new in advance moisturizing time t '.Then in advance the moisturizing time t ' and actual moisturizing time T Relations Among that relatively calculate: if t '≤T then stops to supply water; If T＜t ' then continues to supply water, until behind the T=t ', stop moisturizing, then the Water Level Control of Steam switches to the control of three momentums.
Three, smelt beginning
After receiving the smelting commencing signal, be not the smelting that will begin in a minute in fact, whether all satisfy but detect first the preparatory condition of smelting.Water level that very crucial factor is exactly drum in the preparatory condition of smelting must satisfy water level between L0～H3.
Therefore must detect the drum actual water level, if the drum actual water level L that detects this moment
ActualDuring≤L0, then open into water stop valve 2, and variable valve 3 apertures 80～100%, still continue to carry out moisturizing according to setting-up time amount t, in the moisturizing process, if moisturizing has reached L
ActualDuring＞L0, can through manually after operation screen is confirmed, stop moisturizing and begin smelting;
If the L that detects
ActualDuring 〉=H3, open blowoff valve 4, the row draining is to L
ActualBehind＜the H2, close blowoff valve 4, can through manually after operation screen is confirmed, begin to smelt;
If the L0＜L that detects
ActualDuring＜H3, when beginning to smelt, still continue to carry out moisturizing according to setting-up time amount t, can guarantee that like this drum shifts to an earlier date moisturizing, overcome the drum " false water level " in early stage, until behind the T=t, then switch to steam water-level three momentums control step, carry out PID by the preset water level of reality and pressure and automatically regulate.
Example, the existing setting: L0=0cm, H2=+450mm, H3=+500mm, L1=-500, therefore H4=+600 works as L
ActualDuring≤0cm, still carry out moisturizing by t, until L
Actual＞0cm begins to smelt; Work as L
ActualDuring 〉=+500mm, then carry out draining, until L
Actual＜+450mm stops draining and begins smelting; In addition, work as L
Actual≤-500 o'clock, then hang down and report to the police and moisturizing; As+600≤L
ActualThe time, carry out height and report to the police also draining to L
Actual＜+450mm.
Four, smelt end
When smelting signal ended, directly do not close stop valve, but regulate according to the actual value of water level, guaranteed water level is controlled at standby water level section H1～H3, at this moment closes into water stop valve 2, makes steam water-level constant, in order to carry out next heat moisturizing, specifically be controlled to be:
If L
ActualDuring＜H1, open into water stop valve 2, water pump 8 and variable valve 3, variable valve 3 apertures are adjusted to 80% position, to L
ActualStop behind=the H2 supplying water;
If L
ActualDuring 〉=H1, then need not moisturizing, and keep water level constant.
Example is worked as L
ActualDuring＜+100mm, carry out moisturizing, until L
Actual=+450mm; Work as L
ActualDuring 〉=+100mm, keep that water level is constant to be got final product.
This control method also comprises the step of Steam Recovery control in addition, and is specific as follows:
See also shown in Figure 4ly, P1 is that low pressure limit value, the P2 of drum steam are PID controlled pressure value among the figure, and P3 is the upper pressure limit value; According to design, when the drum internal pressure reached P2, steam began to reclaim.But practical situations is, when P2 opens Steam Recovery valve 5, because it is not to descend that the load of smelting large (blowing oxygen quantity is large) causes the pressure in the drum, but still rises at once, Steam Recovery valve 5 will continue out large valve according to the PID control of pressure even to fully open position this moment.After Steam Recovery valve 5 was opened rapidly, a large amount of water can be taken away together along with steam, thereby caused false water level, also can cause that the follow-up water supply capacity of drum is not enough simultaneously.
General Steam Recovery has a minimum pressure requirement, decides according to steam reservoir vessel pressure, as is set as P1=3.2MPa.Therefore, detect in real time smelting omnidistance reply drum vapor pressure, the pressure P that detects when drum surpasses P1, and when not reaching P2=3.5MPa, can control Steam Recovery valve 5 and shift to an earlier date slowly recovered steam, avoid pressure 5 quilts of Steam Recovery valve that rise sharply to the P2 to open rapidly.The concrete practice can be according to actual conditions, if drum pressure P slowly opens Steam Recovery valve 5 in P1～P2 interval, aperture can correspondence be set as 0%～30%, valve opening and drum pressure be the linear functional relation that rises on the slope; If vapor pressure reaches P2 in the drum, the control that the Steam Recovery valve is 5 changes the PID control of pressure into; If when vapor pressure reaches P3=3.9MPa in the drum, carry out mechanical self-pressing type by diffusion valve 6 and diffuse.
Adopt control method of the present invention, can be according to actual smelting situation and the converter drum load capacity of converter, and optimized for the problem of water level control that exists, on the basis of three momentums control, add the control of smelting information, controlling by the load (blowing oxygen quantity) of setting is the drum moisturizing in advance, avoided the insufficient water phenomenon occurring because of the short time increase of load, reduce the generation of the false water level of drum, and then reduced the smelting termination situation that causes because " false water level " alerting signal is chain.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (4)
1. four impulse control methods of a steam drum water level of converter is characterized in that,
The method comprises that receiving the smelting signal shifts to an earlier date the step of moisturizing and the step of steam water-level three momentums control to drum, and wherein, in advance moisturizing comprises the circulation step of following A to D:
A. when the waiting status of converter, control drum intake pump is opened, and the water inlet stop valve cuts out, and the inlet regulating valve aperture is 5～20%;
B. when the heat of converter began, calculating shifted to an earlier date rate of water make-up and carries out moisturizing according to blowing oxygen quantity, and this step specifically comprises:
B1. set up the in advance relational expression of rate of water make-up according to the blowing oxygen quantity of setting, the described in advance relational expression of rate of water make-up is:
Q
Water=KQ
Oxygen,
L
ActualS+FMt 〉=KQ
Oxygen+ L
MinimumS,
In the formula, Q
WaterBe water consumption, Q
OxygenBe the blowing oxygen quantity of setting, K is coefficient, L
ActualDrum actual water level when beginning for heat, L
MinimumBe the lowest water level that drum must store, S is the drum horizontal cross-sectional area, and F is the design discharge of drum inlet regulating valve, and M is the aperture of inlet regulating valve, and t is for shifting to an earlier date the moisturizing time;
B2. calculate the in advance moisturizing time according to the relational expression that shifts to an earlier date rate of water make-up, the described in advance computing formula of moisturizing time is:
T=[KQ
Oxygen-(L
Actual-L
Minimum) S]/(FM)+t
0
In the formula, Q
OxygenBe the blowing oxygen quantity of setting, K is coefficient, L
ActualBe drum actual water level this moment, L
MinimumBe the lowest water level that drum must store, S is the drum horizontal cross-sectional area, and F is the design discharge of drum inlet regulating valve, and M is the aperture of inlet regulating valve, and t is for shifting to an earlier date the moisturizing time, t
0Be the time margin of setting;
B3. moisturizing time and the actual moisturizing time that calculates is compared, and then the switch of control water inlet stop valve, in this step,
If during t≤T, close into the water stop valve, stop moisturizing;
If during t＞T, then continue moisturizing, until T=t stops moisturizing;
If t≤0 o'clock represents the smelting of enough this heats of water cut of present drum, need not moisturizing;
If t＞0 o'clock is then opened the moisturizing stop valve, and the moisturizing variable valve is opened to 80～100% aperture, carry out the moisturizing timing, make T be added to t since 0 after, finish moisturizing;
Above-mentioned t is for shifting to an earlier date the moisturizing time, and T is the actual moisturizing time;
C. before the smelting of converter begins, detect the drum actual water level and carry out the water level compensation;
D. when the smelting of converter finishes, according to actual water level water level is adjusted to standby water level section H1～H3, and closes into the water stop valve.
2. four impulse control methods of steam drum water level of converter as claimed in claim 1 is characterized in that:
In the moisturizing process, if water level reaches drum when stopping discharge level H2, then stop to supply water, and record the time t of moisturizing
1And when the smelting stage, water level decline occured, continue moisturizing, moisturizing time this moment is from t
1After beginning to be added to t, finish moisturizing.
3. four impulse control methods of steam drum water level of converter as claimed in claim 1 is characterized in that:
In step C,
If the L that detects
ActualDuring≤L0, open into the water stop valve, carry out moisturizing to L
ActualStop behind＞the L0 and begin smelting;
If the L that detects
ActualDuring 〉=H3, open blowoff valve, carry out draining to L
ActualStop behind＜the H2 and begin smelting;
If the L0＜L that detects
ActualDuring＜H3, when beginning to smelt, continue to carry out moisturizing according to t, behind T=t, switch to steam water-level three momentums control step, carry out PID by the preset water level of reality and pressure and automatically regulate;
Above-mentioned L
ActualFor smelting the front drum actual water level of beginning, L0 is the drum lower limit water level that reaches smelting condition, and H3 is the drum upper limit water level that reaches smelting condition, and H2 is that drum stops discharge level.
4. four impulse control methods of steam drum water level of converter as claimed in claim 1 is characterized in that:
The method also comprises the step e of drum Steam Recovery control, comprising:
E1. set respectively low pressure limit value P1, PID controlled pressure value P2 and the upper pressure limit value P3 of drum steam;
E2. detect in real time the actual pressure value P of drum, and compare with each value among the E1, to control Steam Recovery:
If during P1＜P＜P2, shift to an earlier date slow recovered steam by the control of Steam Recovery valve;
If during P2≤P＜P3, carry out recovered steam by the PID control of pressure;
If during P 〉=P3, carry out mechanical self-pressing type and diffuse.
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| CN102679313B (en) * | 2012-05-18 | 2013-11-27 | 南通市利浪节能电器有限公司 | False water level identification protection control system of electric heating steam generator |
| 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 |
| CN104373926A (en) * | 2014-08-15 | 2015-02-25 | 哈尔滨工程大学 | Marine boiler water level control system |
| CN105671239A (en) * | 2014-11-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Method for preventing flue leakage of exhaust-heat boiler of converter |
| CN108460476A (en) * | 2017-12-30 | 2018-08-28 | 浙江中睿低碳科技有限公司 | Drain valve optimization method based on Internet of Things |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566371A (en) * | 2003-06-19 | 2005-01-19 | 首钢总公司 | Converter steam dome high/low water level automatic feedwater unit |
| CN101101112A (en) * | 2007-04-29 | 2008-01-09 | 上海红箭自动化设备有限公司 | Control method of boiler water level and its control system |
| CN101135438A (en) * | 2007-08-15 | 2008-03-05 | 中国电力科学研究院 | Method for correcting water level of steam drum based on temperature and pressure |
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2010
- 2010-07-09 CN CN 201010224478 patent/CN102312040B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566371A (en) * | 2003-06-19 | 2005-01-19 | 首钢总公司 | Converter steam dome high/low water level automatic feedwater unit |
| CN101101112A (en) * | 2007-04-29 | 2008-01-09 | 上海红箭自动化设备有限公司 | Control method of boiler water level and its control system |
| CN101135438A (en) * | 2007-08-15 | 2008-03-05 | 中国电力科学研究院 | Method for correcting water level of steam drum based on temperature and pressure |
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| Publication number | Publication date |
|---|---|
| CN102312040A (en) | 2012-01-11 |
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