CN105114931A - Control method for modifying overheated steam temperature of boiler - Google Patents
Control method for modifying overheated steam temperature of boiler Download PDFInfo
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- CN105114931A CN105114931A CN201510350051.1A CN201510350051A CN105114931A CN 105114931 A CN105114931 A CN 105114931A CN 201510350051 A CN201510350051 A CN 201510350051A CN 105114931 A CN105114931 A CN 105114931A
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Abstract
The invention discloses a control method for modifying overheated steam temperature of a boiler. The control method comprises a. establishing a feedforward control model, establishing a model reflecting fuel variation, and determining a transfer function of feedforward control; b. setting the initial value; c. sampling data, and determining a sampling period T, the present sampling time and parameters; and d. setting parameters. According to the control method, a main adjuster controls the overheated steam temperature of a boiler through PID cascade control and feedforward signals of fuel amount and the rate of change, to make sure that the overheated steam temperature can changes according to a set heating curve. By receiving a correction signal of the main adjustor and a temperature signal of the outlet of the desuperheater, an auxiliary adjuster not only can restrain and eliminate inference caused by changes of temperate at the outlet of the desuperheater, but also can immediately eliminate influence caused by changes of the fuel amount, real-time control and on-line correction on a computer can be facilitated, the position control precision of a process system can be raised, so the control method has significance in popularization in relative control process.
Description
[technical field]
The present invention relates to the technical field of the temperature automatic control of the superheated steam of Automatic Control of Boiler technical field, particularly boiler.
[background technology]
The superheater of modern boiler works under high temperature, condition of high voltage, and the superheat steam temperature of boiler export is the maximum temperature of working medium in whole carbonated drink stroke, for the safety and economic operation of power plant by significant impact.Boiler Steam superheating system comprises primary superheater, attemperator, two-stage superheater etc.
Superheat steam temperature controls to be one of the vital task of boiler automatic automatically, its control disturbing factor is many, difficulty is comparatively large, and main interference factors has following several respects: (1) superheater is as control object, and it is many appearances inertial element with larger delay; (2) there is contradiction in the structural design of equipment and the requirement of control; (3) disturbance factor causing superheater outlet vapor (steam) temperature to change is a lot, and influences each other again between various disturbance factor, makes the dynamic process of object very complicated.
Also the control method to boiler overheating steam temperature is had at present, as CN200910017265, based on Power Plant DCS and pid control algorithm, mainly utilize PID cascade control method, introduce each change rate of steam temperature and boiler master instruction rate of change, but be difficult to eliminate the interference effect to caused by the change of fuel quantity, this method is based on PID serials control algorithm, using fuel quantity and differential thereof as feed-forward signal, overheating steam temperature is controlled at master selector, ensure the heating curve change of overheating steam temperature by regulation, while the correction signal that secondary controller accepts master selector and attemperator outlet air temperature signal, eliminate the interference that the variation because of fuel quantity produces at once.
[summary of the invention]
Object of the present invention solves the problems of the prior art exactly, a kind of control method improving boiler overheating steam temperature is proposed, the interference effect produced because of the change of fuel quantity can be eliminated at once, thus effectively improve the control accuracy of procedures system, and be easy to realize computer control.
For achieving the above object, the present invention proposes a kind of control method improving boiler overheating steam temperature, is on the basis based on boiler overheating steam temperature PID serials control algorithm, and using fuel quantity and differential thereof as feed-forward signal, concrete steps comprise:
A () sets up feed forward models: the model setting up fuel quantity change, determines the transfer function of feedforward control;
B () arranges initial value: the setting value θ determining boiler overheating steam temperature
t0;
(c) data sampling: determine sampling period T, the PI parameter etc. of the sampling superheat steam temperature of current time, valve opening, attemperator outlet temperature, master selector and secondary controller;
(d) setting parameter: according to practical tuning method, according to the principle of " first inner loop main ring again ", the parameter of loop in series of adjusting.
As preferably, in described (a) step, the transfer function of feedforward control is different according to the difference of the model of field working conditions, boiler, straight blowing or middle warehouse etc., and mainly the coordinative role of foundation coal pulverizer, powder feeding machine and air quantity is determined.
As preferably, in described (a) step, the control method of the boiler overheating steam temperature of improvement is under the disturbance overcoming attemperator outlet temperature, eliminates the interference effect produced because of the change of fuel quantity further.
As preferably, in described (d) step, whole parameter step first the proportional band of master selector is placed on 100% place, with " attenuation curve method " subloop of adjusting, then subloop is considered as the part in regulating system, use the same method major loop of adjusting.
Beneficial effect of the present invention: the present invention adds the feed-forward signal of fuel quantity and rate of change by PID serials control, the superheat steam temperature of boiler is controlled at master selector, ensure the heating curve change of overheating steam temperature by regulation, while the correction signal that secondary controller accepts master selector and attemperator outlet air temperature signal, not only there is suppression eliminating effect to the interference produced because of the change of attemperator outlet temperature, and the interference that the variation because of fuel quantity produces can be eliminated at once, be conducive to real-time control and the on-line correction of computer, improve reaction speed and the control position precision of procedures system, to relevant control process, there is dissemination.
Feature of the present invention and advantage will be combined by embodiment
accompanying drawingbe described in detail.
[accompanying drawing explanation]
fig. 1it is a kind of steam perturbation action signal improving the control method of boiler overheating steam temperature of the present invention
figure;
fig. 2it is a kind of whole-process control system frame improving the control method of boiler overheating steam temperature of the present invention
figure.
[detailed description of the invention]
Consult
fig. 1,
fig. 2, a kind of control method improving boiler overheating steam temperature of the present invention, concrete steps comprise:
Step one, set up fuel quantity change feed forward models, determine the transfer function of feedforward control;
Step 2, the setting value θ of boiler overheating steam temperature is set
t0;
Step 3, determine sampling period T, the PI parameter etc. of the superheat steam temperature of sampling current time, valve opening, attemperator outlet temperature, master selector and secondary controller;
Step 4, according to practical tuning method, according to the principle of " first inner loop main ring again ", the parameter of loop in series of adjusting.
The transfer function of described feedforward control is different according to the difference of the model of field working conditions, boiler, straight blowing or middle warehouse etc., and the coordinative role mainly according to coal pulverizer, powder feeding machine and air quantity is determined; The control method of the boiler overheating steam temperature of described improvement is under the disturbance overcoming attemperator outlet temperature, eliminates the interference effect produced because of the change of fuel quantity further; Described whole parameter step first the proportional band of master selector is placed on 100% place, and with " attenuation curve method " subloop of adjusting, then subloop is considered as the part in regulating system, use the same method major loop of adjusting.
The course of work of the present invention:
The present invention in the course of the work, the present invention adds the feed-forward signal of fuel quantity and rate of change by PID serials control, the superheat steam temperature of boiler is controlled at master selector, ensure the heating curve change of overheating steam temperature by regulation, while the correction signal that secondary controller accepts master selector and attemperator outlet air temperature signal, not only there is suppression eliminating effect to the interference produced because of the change of attemperator outlet temperature, and the interference that the variation because of fuel quantity produces can be eliminated at once, be conducive to real-time control and the on-line correction of computer, improve reaction speed and the control position precision of procedures system, to relevant control process, there is dissemination.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, anyly all belongs to protection scope of the present invention to the scheme after simple transformation of the present invention.
Claims (4)
1. one kind is improved the control method of boiler overheating steam temperature, it is characterized in that: described control method is on the basis based on boiler overheating steam temperature PID serials control algorithm, using fuel quantity and differential thereof as feed-forward signal, eliminate the interference effect produced because of the change of fuel quantity at once, concrete steps comprise:
A () sets up feed forward models: the model setting up fuel quantity change, determines the transfer function of feedforward control;
B () arranges initial value: the setting value θ determining boiler overheating steam temperature
t0;
(c) data sampling: determine sampling period T, the PI parameter etc. of the sampling superheat steam temperature of current time, valve opening, attemperator outlet temperature, master selector and secondary controller;
(d) setting parameter: according to practical tuning method, according to the principle of " first inner loop main ring again ", the parameter of loop in series of adjusting.
2.
as claima kind of control method improving boiler overheating steam temperature described in 1, it is characterized in that: in described (a) step, the transfer function of feedforward control is different according to the difference of the model of field working conditions, boiler, straight blowing or middle warehouse etc., and the coordinative role mainly according to coal pulverizer, powder feeding machine and air quantity is determined.
3.
as claima kind of control method improving boiler overheating steam temperature described in 1, it is characterized in that: in described (a) step, the control method of the boiler overheating steam temperature improved is under the disturbance overcoming attemperator outlet temperature, eliminates the interference effect produced because of the change of fuel quantity further.
4.
as claima kind of control method improving boiler overheating steam temperature described in 1, it is characterized in that: in described (d) step, whole parameter step first the proportional band of master selector is placed on 100% place, with " attenuation curve method " subloop of adjusting, then subloop is considered as the part in regulating system, use the same method major loop of adjusting.
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| CN201510350051.1A CN105114931A (en) | 2015-06-23 | 2015-06-23 | Control method for modifying overheated steam temperature of boiler |
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| CN201510350051.1A CN105114931A (en) | 2015-06-23 | 2015-06-23 | Control method for modifying overheated steam temperature of boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524131A (en) * | 2016-09-23 | 2017-03-22 | 华北电力大学（保定） | Feedforward control method for steam temperature of thermal power generating unit |
| CN107355772A (en) * | 2017-06-20 | 2017-11-17 | 浙江大学 | The control method of the anti-overtemperature of primary superheater outlet temperature based on superheater temperature characteristic |
| WO2019165839A1 (en) * | 2018-03-01 | 2019-09-06 | 德普新源（香港）有限公司 | Boiler superheated steam temperature control method, device and system |
| CN111396847A (en) * | 2020-03-27 | 2020-07-10 | 上海电力大学 | Steam temperature control method for boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524131A (en) * | 2016-09-23 | 2017-03-22 | 华北电力大学（保定） | Feedforward control method for steam temperature of thermal power generating unit |
| CN107355772A (en) * | 2017-06-20 | 2017-11-17 | 浙江大学 | The control method of the anti-overtemperature of primary superheater outlet temperature based on superheater temperature characteristic |
| WO2019165839A1 (en) * | 2018-03-01 | 2019-09-06 | 德普新源（香港）有限公司 | Boiler superheated steam temperature control method, device and system |
| CN111396847A (en) * | 2020-03-27 | 2020-07-10 | 上海电力大学 | Steam temperature control method for boiler |
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