CN103277783A - Supercritical coal-fired unit water wall metal wall temperature early-warning optimal control method - Google Patents
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Abstract
The invention relates to a supercritical coal-fired unit water wall metal wall temperature early-warning optimal control method. The method comprises the steps that a water wall metal wall temperature control loop connector is added on a logical configuration fuel and water supply control loop of an original coordinated control system; water wall metal wall temperature control loop logical configuration is conducted and is output and led into the water wall metal wall temperature control loop connector to be used as feedforward signals of water supply and fuel control; a control system is put into actual operation, water wall metal wall temperature control loop relevant parameters are adjusted and set on line according to a real-time operation curve, and the expected effect is finally achieved. According to an existing DCS coordinated control system, the supercritical coal-fired unit water wall metal wall temperature early-warning optimal control method is good in real-time performance, and simple in field debugging process, and can achieve engineering realization easily. Both supercritical coal-fired unit major parameters and water wall metal wall temperature control are automatically considered, water wall overtemperature pipe explosion accidents are effectively avoided, labor intensity of an operator is reduced, and unit operation safety and economy are greatly improved.
Description
Technical field
The invention belongs to thermal technology's control technology field of thermal power generation unit boiler safety, relate in particular to a kind of overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method, specifically is a kind of method of avoiding the water-cooling wall of power boiler overtemperature tube burst.
Background technology
Along with development of electric power industry, the installed capacity of thermal power generation unit increases day by day, and overcritical coal-fired unit has become main force's unit of frequency modulation peak regulation in the electrical network.In order to satisfy the needs of electrical network AGC and primary frequency modulation, the big capacity unit lifting load on a large scale of having to frequently, this stable operation to unit parameter is had higher requirement.At present, typical unit cooperative control system is general only to be controlled at main unit parameters such as steam temperatures, other parameters such as tube wall temperature is only had monitor and warning function.Especially as the water-cooling wall of boiler critical component, be one of main heating surface of boiler, its condition of work is more abominable, and along with improving constantly of boiler parameter, the temperature and pressure of water-cooling wall intraductal working medium also constantly improves.When water-cooling wall tube wall temperature overtemperature takes place, the operations staff can only manually intervene, because the limitation of human intervention on time, space and energy brought disturbance to the unit major parameter inevitably, even the overtemperature tube burst accident takes place, had a strong impact on safety, the economical operation of unit.Therefore, study the comprehensive pre-warning optimal control method of taking into account overcritical coal-fired unit cooperative control and water-cooling wall tube wall temperature and have very important practical significance.
Numerous research institutions and power plant analyzed and researched to the boiler water wall tube wall temperature from different perspectives in recent years.For example " analysis of ultra-supercritical boiler water-cooling wall wall temperature abnormal cause " of " China Power ", multianalysis the unusual influence factor of ultra-supercritical boiler water-cooling wall wall temperature, it is more to point out to influence the unusual factor of water wall of monotube boiler wall temperature, but is mainly two aspects in essence: water side and fiery side.The water side mostly be mechanical reason cause in the pipe cooling flow insufficient due to, by check, replace tubes can be solved; The fire side mainly is due to the heat absorption too much, and main solution is to solve by burning adjustment.Chinese patent " a kind of on-line safety assessment method of water wall ", number of patent application 200910022494.2, can a spot of water-cooling wall of power boiler characteristic parameter of on-line monitoring check point as calculating, and calculate by flowing heat transfer and onlinely to judge whether water-cooling wall flow pulsation, wall temperature overtemperature, exhaustion creep fracture etc. take place.Chinese patent " a kind of boiler heating surface monitoring method based on the overtemperature risk indicator ", number of patent application 201010528854.9, can accurately evaluate the index of overtemperature degree---overtemperature risk, its computational methods have strict theoretical foundation, make heating surface overtemperature risk assessment work quick, accurate and evidence-based.Chinese patent " layout method of station boiler high temperature piping furnace outer wall temperature measurement collection point ", number of patent application 201110428271.3, the method of a kind of furnace outer wall temperature measurement collection point layout is proposed, be intended to give full play to the function of wall temperature real-time monitoring system in the high temperature piping stove, to reduce the service life of temperature deviation and prolongation high temperature tube panel.
More than these documents and patent all be to conduct a research from the angle that improves the wall temperature monitoring accuracy, makes up real-time monitoring and evaluation system, for the operations staff of power plant operation provides reliable reference frame, but these researchs can't replace the operations staff to finish effective control of tube wall temperature.When water-cooling wall tube wall temperature overtemperature takes place, can only carry out human intervention, because the limitation of human intervention on time, space and energy brought disturbance to the unit major parameter inevitably, even the overtemperature tube burst accident takes place, the control effect depends critically upon operations staff's technical merit.
Summary of the invention
At above-mentioned problems of the prior art, the invention provides a kind of overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method, its objective is by existing DCS coordinated control system, automatically take into account the control of overcritical coal-fired unit major parameter and water-cooling wall tube wall temperature, effectively prevent water-cooling wall overtemperature tube burst accident, reduce operations staff's labour intensity, improve security and the economy of unit operation.
The objective of the invention is to be achieved through the following technical solutions.
Overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method may further comprise the steps:
The first step: in the Logical Configuration fuel of former coordinated control system and feedwater control loop, increase water-cooling wall tube wall temperature control loop interface;
Second step: carry out water-cooling wall tube wall temperature control loop Logical Configuration, and its output is incorporated in the water-cooling wall tube wall temperature control loop interface as the feed-forward signal of feedwater with fuel control;
The 3rd step: control system drops into actual motion, and according to the real time execution curve, on-line tuning water-cooling wall tube wall temperature control loop relevant parameter finally reaches the control effect of expection.
Described water-cooling wall tube wall temperature control loop comprises to be increased confluent and reduces two kinds of controls of fuel quantity.
Described increase confluent and the control of minimizing fuel quantity, its effect size is the function of the deviation of water-cooling wall tube wall temperature measuring point maximum and alarming value, and by after the correction of water-cooling wall tube wall temperature maximum temperature rise speed, act on fuel respectively and give water management as feed-forward signal.
Described water-cooling wall tube wall temperature measuring point can directly read from the DCS real-time data base; Described wall temperature maximum temperature rise speed can be calculated by the wall temperature measuring point, if this value is arranged in the DCS real-time data base, also can directly take.
The setting method of described water-cooling wall tube wall temperature control loop relevant parameter is, system is dropped into actual motion, according to unit cooperative control operation curve and water-cooling wall tube wall temperature control curve, on-line tuning relevant parameter repeatedly, when guaranteeing unit major parameter response fast and stable, automatically with the control of water-cooling wall tube wall temperature in the reasonable scope.
The present invention proposes overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method, its advantage and beneficial effect are:
(1) by existing DCS coordinated control system, take into account the control of overcritical coal-fired unit major parameter and water-cooling wall tube wall temperature automatically, prevent water-cooling wall overtemperature tube burst accident effectively, improved security and the economy of unit operation greatly.
(2) can effectively reduce operations staff's labour intensity, and the control effect does not rely on operations staff's technical merit.
(3) real-time is good, and the field adjustable process is simple, is convenient to Project Realization.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is algorithm logic figure of the present invention;
Fig. 2 is workflow diagram of the present invention.
The specific embodiment
The present invention is overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method, as shown in Figure 2, may further comprise the steps:
The first step: in the Logical Configuration fuel of former coordinated control system and feedwater control loop, increase water-cooling wall tube wall temperature control loop interface;
Second step: carry out water-cooling wall tube wall temperature control loop Logical Configuration, and its output is incorporated in the water-cooling wall tube wall temperature control loop interface as the feed-forward signal of feedwater with fuel control;
The 3rd step: control system drops into actual motion, and according to the real time execution curve, on-line tuning water-cooling wall tube wall temperature control loop relevant parameter finally reaches the control effect of expection.
Described water-cooling wall tube wall temperature control loop comprises to be increased confluent and reduces two kinds of controls of fuel quantity.
Described increase confluent and the control of minimizing fuel quantity, its effect size is the function of the deviation of water-cooling wall tube wall temperature measuring point maximum and alarming value, and by after the correction of water-cooling wall tube wall temperature maximum temperature rise speed, act on fuel respectively and give water management as feed-forward signal.
Described water-cooling wall tube wall temperature measuring point can directly read from the DCS real-time data base; Described wall temperature maximum temperature rise speed can be calculated by the wall temperature measuring point, if this value is arranged in the DCS real-time data base, also can directly take.
The setting method of described water-cooling wall tube wall temperature control loop relevant parameter is, system is dropped into actual motion, according to unit cooperative control operation curve and water-cooling wall tube wall temperature control curve, on-line tuning relevant parameter repeatedly, when guaranteeing unit major parameter response fast and stable, automatically with the control of water-cooling wall tube wall temperature in the reasonable scope.
Core concept of the present invention is the general and degree of superheat positive correlation of water-cooling wall tube wall temperature overtemperature, therefore can increase water-cooling wall tube wall temperature overtemperature fuel quantity and confluent protection logic respectively.When the water-cooling wall tube wall temperature is too high, directly reduce fuel quantity, increase confluent, its effect size is the function of the deviation of water-cooling wall tube wall temperature measuring point maximum and alarming value, and by after the correction of water-cooling wall tube wall temperature maximum temperature rise speed, act on fuel respectively and give water management as feed-forward signal.
Algorithm logic figure of the present invention, namely overcritical coal-fired unit water-cooling wall tube wall temperature early warning system optimizing control logic as shown in Figure 1.Among Fig. 1, T
1, T
2..., T
NBe water-cooling wall tube wall temperature measuring point, can directly from the DCS real-time data base, read.Wall temperature maximum temperature rise speed can be calculated by the wall temperature measuring point, if this value is arranged in the DCS real-time data base, also can directly take.f
1(x) be the nonlinear function generator, the deviation that it is input as water-cooling wall tube wall temperature measuring point maximum and alarming value is output as the water-cooling wall tube wall temperature when too high, directly the confluent of the fuel quantity of Jian Shaoing or increase.f
2(x) also be non-linear function generator, the maximum that it is input as water-cooling wall tube wall temperature measuring point temperature rise rate is output as f
1(x) correction coefficient, scope 0.9～1.1.f
1(x) function is to come preact, f according to the actual metal wall temperature with respect to the high low degree of alarming value
2(x) then strengthen or weaken the intensity of this effect according to the trend of tube wall temperature overtemperature, different deviations and speed, the intensity of effect is different.f
1(x) and f
2(x) parameter can be according to the real-time curve on-line tuning, the principle of adjusting is by existing DCS coordinated control system, takes into account the control of overcritical coal-fired unit major parameter and water-cooling wall tube wall temperature automatically, notes, corresponding confluent and fuel quantity control, two groups of f here need to adjust respectively
1(x) and f
2(x) parameter.
Be example with the coal-fired unit of certain 1000MW ultra supercritical below, introduce the algorithm parameter result that adjusts, as shown in table 1.
The unit overview: this 1000MW ultra supercritical unit boiler is made by east boiler limited company, BHK, BHDB, and steam turbine is made by Dongfan Steam Turbine Factory, Hitachi, and generator is made by Dongfang Electric Machine Co., Ltd., Hitachi.This unit boiler is efficient ultra supercritical parameter transformation direct current stove, adopts single burner hearth, resuperheat, balanced draft, dry ash extraction, all steel framework, full overhung construction П type boiler.Pulverized coal preparation system adopts malleation direct-firing, is furnished with 6 coal pulverizers; The movable vane adjustable shaft streaming primary air fan that is provided with two 50% capacity provides once heat, cold wind pulverized coal conveying; Adopt two adjustable air-introduced machines of stator blade and two adjustable pressure fans of movable vane that secondary air flow is provided.What control system adopted is Hitachi's technology, coordinated control system adopts the coordinated control system based on boiler follow, and steam turbine master control increase pressure retracts the loop on this basis, and boiler master increases the power influences loop, adopt full coordination control strategy, combustion water adopts coal with the water mode than control.
In the table 1 with f
1(x) Dui Ying x be water-cooling wall tube wall temperature measuring point maximum and alarming value deviation (℃); With f
2(x) Dui Ying x be water-cooling wall tube wall temperature measuring point temperature rise rate maximum (℃/min); This unit water-cooling wall tube wall temperature measuring point and temperature rise rate all can directly read from the DCS real-time data base; Finish water-cooling wall tube wall temperature control loop Logical Configuration, and after its output is incorporated in the water-cooling wall tube wall temperature control loop interface feed-forward signal as feedwater and fuel control, system is dropped into actual motion, according to unit cooperative control operation curve and the control of water-cooling wall tube wall temperature curve, on-line tuning f repeatedly
1(x), f
2(x) relevant parameter when guaranteeing unit major parameter response fast and stable, is controlled the water-cooling wall tube wall temperature at zone of reasonableness automatically, effectively reduces operations staff's labour intensity; The field adjustable process is simple, is convenient to Project Realization.
The overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control parameter tuning of table 1
Claims (5)
1. overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method is characterized in that may further comprise the steps:
The first step: in the Logical Configuration fuel of former coordinated control system and feedwater control loop, increase water-cooling wall tube wall temperature control loop interface;
Second step: carry out water-cooling wall tube wall temperature control loop Logical Configuration, and its output is incorporated in the water-cooling wall tube wall temperature control loop interface as the feed-forward signal of feedwater with fuel control;
The 3rd step: control system drops into actual motion, and according to the real time execution curve, on-line tuning water-cooling wall tube wall temperature control loop relevant parameter finally reaches the control effect of expection.
2. overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method according to claim 1 is characterized in that: described water-cooling wall tube wall temperature control loop comprises to be increased confluent and reduces two kinds of controls of fuel quantity.
3. overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method according to claim 2, it is characterized in that: described increase confluent and the control of minimizing fuel quantity, its effect size is the function of the deviation of water-cooling wall tube wall temperature measuring point maximum and alarming value, and by after the correction of water-cooling wall tube wall temperature maximum temperature rise speed, act on fuel respectively and give water management as feed-forward signal.
4. overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method according to claim 3 is characterized in that: described water-cooling wall tube wall temperature measuring point, can directly read from the DCS real-time data base; Described wall temperature maximum temperature rise speed can be calculated by the wall temperature measuring point, if this value is arranged in the DCS real-time data base, also can directly take.
5. overcritical coal-fired unit water-cooling wall tube wall temperature early warning optimal control method according to claim 1, it is characterized in that: the setting method of described water-cooling wall tube wall temperature control loop relevant parameter is, system is dropped into actual motion, according to unit cooperative control operation curve and water-cooling wall tube wall temperature control curve, on-line tuning relevant parameter repeatedly, when guaranteeing unit major parameter response fast and stable, automatically with the control of water-cooling wall tube wall temperature in the reasonable scope.
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| CN105202519A (en) * | 2015-10-27 | 2015-12-30 | 国家电网公司 | Frequency and peak load modulation all condition coordination control method of heat supply unit |
| CN105202520A (en) * | 2015-10-28 | 2015-12-30 | 中国神华能源股份有限公司 | Boiler wall temperature control device and method |
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| CN113266814A (en) * | 2021-05-20 | 2021-08-17 | 华能安源发电有限责任公司 | Boiler water wall temperature control method |
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