CN102072480B - Three-impulse control system of waste heat boiler drum water level - Google Patents
Three-impulse control system of waste heat boiler drum water level Download PDFInfo
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- CN102072480B CN102072480B CN2010106162938A CN201010616293A CN102072480B CN 102072480 B CN102072480 B CN 102072480B CN 2010106162938 A CN2010106162938 A CN 2010106162938A CN 201010616293 A CN201010616293 A CN 201010616293A CN 102072480 B CN102072480 B CN 102072480B
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Abstract
The invention provides a three-impulse control system of a waste heat boiler drum water level, comprising a waste heat boiler which comprises a waste heat boiler drum, a water level transmitter, a water supply flow transmitter, a steam flow transmitter, a temperature measuring element, a controller which is connected with the water level transmitter, the water supply flow transmitter, the steam flow transmitter and the temperature measuring element, and a water supply regulating valve which is connected between the controller and the waste heat boiler drum. The three-impulse control system of the waste heat boiler drum water level selects to use a static front feed-forward signal or a dynamic feed-forward signal by judging if the flue temperature of a flue which is connected with the waste heat boiler is changed, so that the problem that the response speed is low when only the static feed-forward signal is used or the anti-interference capability of a system is poor when only the dynamic feed-forward signal is used is prevented.
Description
Technical field
The present invention relates to metallurgical the manufacturing and design field, particularly a kind of three momentum control systems of waste heat boiler steam water-level.
Background technology
Smelt in the technical process of producing metal at smelting furnace, main production equipment has smelting furnace, waste heat boiler etc.Smelting furnace can produce a large amount of high-temperature flue gas in fusion process, the main effect of waste heat boiler is that flue gas is lowered the temperature, and the heat with exchange uses for other production processes for generation of steam simultaneously.Because waste heat boiler is positioned at the smelting furnace exhanst gas outlet, in case have an accident, will influence the production of smelting furnace, thereby cause heavy economic losses.Therefore, in whole smelting process, the control of waste heat boiler is most important.
Waste heat boiler is input more than, exports and complication system that every control parameter intercouples more, and steam water-level is the very important controlled variable of afterheat boiler system.If water level is low excessively, gently then influence moisture balance, the heavy waste heat boiler that then dryouies, can cause accidents such as waste heat boiler blast when serious.If water level is too high, cause steam zone liquid phenomenon easily, not only reduce output and the quality of steam, but also can make the superheater fouling, the turbine blade that perhaps is used in steam-electric power damages.Therefore, in process of production, it is very important within limits that steam water-level is stablized.
The control method of existing waste heat boiler steam water-level is three momentum control methods, wherein, is main momentum as the steam water-level of controlled variable, is auxiliary momentum for improving steam flow and the feedwater flow that the control quality introduces.
The implementation method commonly used of three momentums control is the three momentums control that feedforward adds feedback, version difference according to feed-forward signal, this kind three momentum control methods can be divided into two kinds of forms: a kind of is static feedforward, uses the difference of feedwater flow and steam flow as feed-forward signal; Another kind is dynamic Feedforward, and the differential of the difference of use feedwater flow and steam flow is as feed-forward signal.
The shortcoming that prior art exists is, dynamic response is not considered in static feedforward, and under perturbation action, the corrective action of static feedforward can only finally make controlled variable get back to set-point at compensation process, and response speed is slow; The shortcoming of dynamic Feedforward is to the interference noise sensitivity, is easy to amplify high-frequency noise, reduces the signal to noise ratio of system, makes system suppress interference capability and descends.
Summary of the invention
Purpose of the present invention is intended to resolution system poor anti jamming capability or the slow technological deficiency of response speed at least.
For achieving the above object, the present invention proposes a kind of three momentum control systems of waste heat boiler steam water-level, comprising: waste heat boiler drum, feedwater transmitter, steam flow transmitter, feedwater flow transmitter, temperature element, controller and feed-regulating valve.The described waste heat boiler steam water-level of described feedwater transmitters sense; The steam flow that the described waste heat boiler drum of described steam flow transmitters sense produces; Described feedwater flow transmitters sense enters the feedwater flow of described waste heat boiler drum; Described temperature element detects the flue-gas temperature of the flue that links to each other with described waste heat boiler; Described controller links to each other with described temperature element, described feedwater transmitter, described steam flow transmitter and described feedwater flow transmitter, variation according to the flue-gas temperature of described flue, described feedwater flow and described steam flow are calculated to determine feed-forward signal, and according to described feed-forward signal described detected waste heat boiler steam water-level is revised; Described feed-regulating valve links to each other with described controller, regulates described feedwater flow to control described waste heat boiler steam water-level according to described correction result.
Whether the present invention changes to select to use static feed-forward control signals by the flue-gas temperature of judging the flue that links to each other with waste heat boiler still is the dynamic Feedforward control signal, avoid the slow problem of response speed of only using static feed-forward signal to bring, perhaps only used the problem of system's poor anti jamming capability that the dynamic Feedforward signal brings.
The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the structural representation of three momentum control systems of the waste heat boiler steam water-level of the embodiment of the invention; And
Fig. 2 is the flow chart of three momentum control methods of the waste heat boiler steam water-level of the embodiment of the invention.
The specific embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical or similar label is represented identical or similar elements or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
Be illustrated in figure 1 as the structural representation of three momentum control systems of the waste heat boiler steam water-level of the embodiment of the invention, this system comprises: the waste heat boiler 1, water level transmitter 2, steam flow transmitter 3, feedwater flow transmitter 4, temperature element 5, controller 6 and the feed-regulating valve 7 that comprise waste heat boiler drum 10.
Wherein, water level transmitter 2, steam flow transmitter 3, feedwater flow transmitter 4 all link to each other with waste heat boiler drum 1, detect the water level of waste heat boiler drum 10, the steam flow that waste heat boiler drum 10 produces and the feedwater flow that enters waste heat boiler drum 10 respectively, and detected result is sent to controller 6.Temperature element 5 detects the flue-gas temperature of the flue 8 that links to each other with waste heat boiler 1, and detected temperature is sent to controller 6.Controller 6 links to each other with water level transmitter 2, steam flow transmitter 3, feedwater flow transmitter 4 and temperature element 5, whether the flue-gas temperature of the flue 8 that judgement links to each other with waste heat boiler 1 changes, according to judged result feedwater flow and steam flow are calculated to determine feed-forward signal, and according to feed-forward signal detected waste heat boiler steam water-level is revised.Feed-regulating valve 7 is connected between controller 6 and the waste heat boiler drum 10, regulates feedwater flow with the water level of control waste heat boiler drum 10 according to the correction result of controller 6.
In one embodiment of the invention, controller 6 comprises receiver module 61, judge module 62, computing module 63 and correcting module 64.Wherein, receiver module 61 is used for receiving water level, steam flow transmitter 3 detected steam flows and the feedwater flow transmitter 4 detected feedwater flows of temperature element 5 detected flue-gas temperatures, water level transmitter 2 detected waste heat boiler drums 1; Judge module 62 is used for judging whether flue-gas temperature changes; The judged result that computing module 63 is used for according to judge module 62 calculates to determine feed-forward signal to feedwater flow and steam flow; Correcting module 64 is used for according to feed-forward signal detected waste heat boiler steam water-level being revised.
Particularly, if judge module 62 judges that flue-gas temperatures change, then computing module 63 is asked for the differential of difference of feedwater flow and steam flow as feed-forward signal; If judge module 62 judges that the flue-gas temperature of waste heat boiler does not change, then computing module 63 is asked for the difference of feedwater flow and steam flow as feed-forward signal.In addition, in order to improve the precision of control, in another embodiment of the present invention, controller 6 also comprises compensating module 65, for the steam flow that detected steam flow is compensated after calculating compensates with acquisition.
Be illustrated in figure 2 as the flow chart of three momentum control methods of the waste heat boiler steam water-level of the embodiment of the invention, three momentum control systems in conjunction with the waste heat boiler steam water-level of Fig. 1 may further comprise the steps:
Step S101, water level transmitter 2 detects the water level of waste heat boiler drum 10, steam flow transmitter 3 detects the steam flow that waste heat boiler drum 10 produces, feedwater flow transmitter 4 detects the feedwater flow that enters waste heat boiler drum 10, and temperature element 5 detects the flue-gas temperature of the flue 8 that links to each other with waste heat boiler 1.
Step S102, controller 6 receives temperature element 5 detected flue-gas temperatures, judges whether flue-gas temperature changes.
Step S103 if controller 6 judges that flue-gas temperatures change, then asks for the differential of difference of feedwater flow and steam flow as feed-forward signal.
For example, when melting begins to feed intake and melting when stopping to feed intake, the variation maximum that the flue-gas temperature of flue 8 takes place, disturbance is more frequent, at this moment, use the differential (that is, the dynamic Feedforward signal) of the difference of feedwater flow and steam flow that the waste heat boiler steam water-level is controlled, thereby fast disturbance is responded.
Step S104 if controller 6 judges that flue-gas temperature does not change, then asks for the difference of feedwater flow and steam flow as feed-forward signal.
For example, after the blanking amount is stable, the variation of the flue-gas temperature of flue 8 is less relatively, disturbance is also less relatively, at this moment, switch to and use the difference (that is, static feed-forward signal) of feedwater flow and steam flow that the waste heat boiler steam water-level is controlled, avoid continuing to use the dynamic Feedforward signal to cause the antijamming capability variation of system.
In order to improve the precision of control, in one embodiment of the invention, the compensation that detected steam flow is carried out temperature and pressure obtains marking the calculating that steam flow under the condition participates in feed-forward signal, flow after being about to steam flow and multiply by compensating factor and be compensated, wherein, the computing formula of compensating factor is as follows:
Wherein, P is the detected pressures under the operating mode, and T is the detected temperatures under the operating mode, and A_P is absolute pressure, and A_T is absolute temperature, and R_P is reference pressure, and R_T is reference temperature.The computational methods that should be understood that above-mentioned compensating factor K only are exemplary embodiment, in addition, also can use additive method to determine compensating factor.
Step S105, controller 6 is revised detected waste heat boiler steam water-level according to feed-forward signal, and regulates feedwater flow with control waste heat boiler steam water-level according to correction result control feed-regulating valve 7.
In one embodiment of the invention, controller 6 is revised detected waste heat boiler steam water-level by following formula according to feed-forward signal,
Waste heat boiler steam water-level=detected waste heat boiler steam water-level+C * feed-forward signal,
Wherein, C is feed-forward coefficients, can set according to operating mode.
Whether the present invention changes to select to use static feed-forward signal by the flue-gas temperature of judging the flue that links to each other with waste heat boiler still is the dynamic Feedforward signal, avoid the slow problem of response speed of only using static feed-forward signal to bring, perhaps only used the problem of system's poor anti jamming capability that the dynamic Feedforward signal brings.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (4)
1. three momentum control systems of a waste heat boiler steam water-level is characterized in that, comprising:
The waste heat boiler that comprises the waste heat boiler drum;
Detect the water level transmitter of described waste heat boiler steam water-level;
Detect the steam flow transmitter of the steam flow of described waste heat boiler drum generation;
Detection enters the feedwater flow transmitter of the feedwater flow of described waste heat boiler drum;
The temperature element of the flue-gas temperature of the flue that detection links to each other with described waste heat boiler;
Controller, described controller links to each other with described temperature element, described water level transmitter, described steam flow transmitter and described feedwater flow transmitter, variation according to the flue-gas temperature of described flue, described feedwater flow and described steam flow are calculated to determine feed-forward signal, and according to described feed-forward signal described detected waste heat boiler steam water-level is revised; And
Feed-regulating valve, described feed-regulating valve are connected between described controller and the described waste heat boiler drum, regulate feedwater flow controlling described waste heat boiler steam water-level according to described correction result,
Wherein, described controller further comprises:
Receiver module, be used for to receive the detected waste heat boiler steam water-level of flue-gas temperature, described water level transmitter of the detected waste heat boiler of described temperature element, described steam flow transmitters sense to steam flow and the feedwater flow that arrives of described feedwater flow transmitters sense;
Judge module is used for judging whether the flue-gas temperature of described flue changes;
Computing module is used for the judged result according to described judge module, and described feedwater flow and described steam flow are calculated to determine feed-forward signal; With
Correcting module is used for according to described feed-forward signal described detected waste heat boiler steam water-level being revised,
Wherein, described computing module calculates to determine that feed-forward signal further comprises according to the judged result of described judge module to described feedwater flow and described steam flow:
Change if judge the flue-gas temperature of described flue, then ask for the differential of difference of described feedwater flow and described steam flow as feed-forward signal; With
Do not change if judge the flue-gas temperature of described flue, then ask for the difference of described feedwater flow and described steam flow as feed-forward signal.
2. three momentum control systems of waste heat boiler steam water-level according to claim 1 is characterized in that, described correcting module is revised further described detected waste heat boiler steam water-level according to described feed-forward signal and comprised:
Described correcting module is revised described detected waste heat boiler steam water-level by following formula according to described feed-forward signal,
Waste heat boiler steam water-level=detected waste heat boiler steam water-level+C * feed-forward signal,
Wherein, described C is feed-forward coefficients.
3. three momentum control systems of waste heat boiler steam water-level according to claim 1, it is characterized in that, described controller also comprises compensating module, and described compensating module is for the steam flow that described detected steam flow is compensated after calculating compensates with acquisition.
4. three momentum control systems of waste heat boiler steam water-level according to claim 3 is characterized in that, carry out the compensating factor that described compensation is calculated
Wherein, P is the detected pressures under the operating mode, and T is the detected temperatures under the operating mode, and A_P is absolute pressure, and A_T is absolute temperature, and R_P is reference pressure, and R_T is reference temperature.
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| CN103811090B (en) * | 2012-11-14 | 2016-06-15 | 中国广核集团有限公司 | A kind of pressurized water reactor nuclear power station steam generator method for controlling water level and system |
| CN103292312B (en) * | 2013-06-25 | 2014-10-29 | 莱芜钢铁集团有限公司 | Method for controlling water level of steam pocket |
| US9476584B2 (en) * | 2013-12-12 | 2016-10-25 | General Electric Company | Controlling boiler drum level |
| CN108266714A (en) * | 2018-01-08 | 2018-07-10 | 中国恩菲工程技术有限公司 | Waste heat boiler liquid level of steam drum control method |
| CN108119895A (en) * | 2018-01-08 | 2018-06-05 | 中国恩菲工程技术有限公司 | Waste heat boiler liquid level of steam drum control system |
| CN109405628A (en) * | 2018-06-14 | 2019-03-01 | 山东中农绿能工程设计有限公司 | The method of heat accumulator system PID fuzzy cascade control system |
| CN109442380B (en) * | 2018-10-19 | 2021-03-30 | 王琳 | Boiler water supply control and waste heat recovery and deoxidization method |
| CN109780528B (en) * | 2019-01-28 | 2020-11-24 | 浙江工业大学 | Three-impulse control method for reducing boiler liquid level overshoot |
| CN112066360B (en) * | 2020-09-15 | 2023-09-19 | 万华化学集团股份有限公司 | Control method for drum liquid level display, storage medium and electronic equipment |
| CN112180877B (en) * | 2020-10-19 | 2021-11-30 | 浙江工业大学 | Method for determining feedforward coefficient compensation |
| CN113566188A (en) * | 2021-07-30 | 2021-10-29 | 中国恩菲工程技术有限公司 | Boiler drum liquid level three-impulse control method, system, equipment and storage medium |
| CN113847590B (en) * | 2021-10-29 | 2022-09-13 | 神彩科技股份有限公司 | Method, device, system and equipment for controlling water level of steam drum |
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