CN108361731B - Hot-water boiler air and flue system automation control method - Google Patents
Hot-water boiler air and flue system automation control method Download PDFInfo
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- CN108361731B CN108361731B CN201810004471.8A CN201810004471A CN108361731B CN 108361731 B CN108361731 B CN 108361731B CN 201810004471 A CN201810004471 A CN 201810004471A CN 108361731 B CN108361731 B CN 108361731B
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- air
- bed temperature
- bed
- blast volume
- total blast
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
Abstract
The present invention relates to a kind of hot-water boiler air and flue system automation control methods, comprising: is based on boiler load and total blast volume adaptive correction program, calculates and obtain final required total blast volume；Parameter is pressed based on boiler load, oxygen amount, bed temperature and bed, calculates and obtains First air total blast volume.It is whole using entire air and flue system as a control, the total blast volume finally needed is calculated by boiler load and total blast volume adaptive correction program, improves the accuracy of theoretical total blast volume；The calculated result of primary air flow is pressed the co-determination of four parameters by load, oxygen amount, bed temperature and bed, can be guaranteed regulating effect, not destroyed original combustion state；The influence of this parameter of oxysome fraction is fully considered in the calculating of primary air flow, can accelerate entire air and flue system to the responding ability of oxysome fraction, while being also avoided a Secondary Air in adjustment process and being matched unbalance problem.
Description
Technical field
The invention belongs to city heat supply Boiler Control fields more particularly to a kind of hot-water boiler air and flue system to automate
Control method.
Background technique
Air and flue system controls the difficult point and emphasis as fluidized-bed combustion boiler control always, main reason is that each change
Coupling phenomenon between amount is serious, as bed temperature is not only influenced by fuel quantity, primary air flow and secondary air flow, while also to be returned
The influence of the multiple parameters such as doses and bed drain purge.Based on factors above, the proportion mode of First air and Secondary Air also can be because current
Operating condition it is different and be affected, simple control bed temperature and oxygen amount often will cause a Secondary Air and match unbalance, easily go out
Existing accident.
The main application of circulating fluidized bed boiler First air is that the wind into an air compartment is made to pass through air-distribution device (blast cap)
Into burner hearth, guarantee the bed material in burner hearth normally fluidize and at the same time and the main transmitting of heat and carrying medium in burner hearth,
Its size influences the adjusting of bed temperature in burner hearth, and in traditional fluidized bed control, First air adjusted as bed temperature one is often
With means, therefore in previous Automatic Control Strategy, bed temperature is adjusted can all be adjusted using First air, and this be actually into
Entering the mistaken ideas in a control, the main function of First air is fluidized bed material and auxiliary combustion, and on the transnaturing of bed temperature
It is the change of combustion state in boiler, is more the influence by boiler load, under this is a kind of all multivariables while acting on
As a result, i.e. bed temperature characterization is a kind of boiler combustion state parameter corresponding under different load, single use is primary
Wind adjusting can't be directly changed bed temperature itself, but the state by changing burning changes bed temperature indirectly, therefore using primary
Although it is in effect the most directly and quick that wind directly controls bed temperature, original combustion state has actually been destroyed, this
It is a kind of regulative mode of morbid state.
The main application of circulating fluid bed boiler secondary air is air capacity and strength imparting material needed for supplement fuel combustion
Back mixing while the distribution of appropriate adjustment temperature field in furnace, make flue-gas temperature be more evenly distributed.In traditional fluidized bed control, two
The means that secondary wind is often used as oxygen flow regulation and bed temperature is assisted to adjust, Secondary Air is feasible as the main means of oxygen flow regulation
, a large amount of test influences other procedure parameters relatively small but practical it can be proved that during secondary air regulation oxygen amount
Firing optimization during, often will appear due to First air adjust bed temperature and cause oxygen amount change after, secondary air regulation process
The excessive or too small situation of middle power output, therefore Secondary Air is used only and carries out oxygen flow regulation, the demand being able to satisfy in control but can not
Guarantee a good air flow rate proportioning state.
Bed temperature auxiliary adjustment is carried out using Secondary Air, goes to carry out bed temperature adjusting generally by a Secondary Air ratio is changed,
Good control effect can be obtained using which, but it is found through experiment that, when bed temperature setting value is higher than actual value, PID tune
Device is saved by reducing the ratio of a Secondary Air, i.e. reduction First air, increases Secondary Air to improve bed temperature, but Secondary Air temperature compared with
It is low, in the coal-fired biggish situation of moisture, Secondary Air is increased using such mode enters bed temperature after burner hearth and will appear first to drop and rise afterwards
Situation, and fall is very big, PID regulator can further decrease a Secondary Air ratio when bed temperature declines, and cause to adjust and continue
Deteriorate, bed temperature increases suddenly after the burning by a period of time, directly results in regulating system toning, jumps out automatically, seriously
When will lead to boiler coke blowing out, therefore this method has limitation, can not be widely applied.
Summary of the invention
The object of the present invention is to provide a kind of hot-water boiler air and flue system automation control methods, are asked with solving above-mentioned technology
Topic.
The present invention provides a kind of hot-water boiler air and flue system automation control methods, comprising:
Based on boiler load and total blast volume adaptive correction program, calculates and obtain final required total blast volume；
Parameter is pressed based on boiler load, oxygen amount, bed temperature and bed, calculates and obtains First air total blast volume.
Further, parameter is pressed based on boiler load, oxygen amount, bed temperature and bed, calculates and obtains First air total blast volume, comprising:
Primary air flow function, which is corresponded to, by boiler load obtains First air coarse adjustment air quantity；
Bed temperature function is corresponded to by boiler load and obtains the theoretical bed temperature value under current loads, and is compensated in this, as bed temperature
The setting value of PID, PID output are that bed temperature compensates primary air flow；
Corresponding compensation primary air flow function is pressed to obtain bed pressure compensation primary air flow by bed.
Further, bed temperature function is corresponded to by boiler load and obtains the theoretical bed temperature value under current loads, and made with this
The setting value of PID is compensated for bed temperature, PID output is that bed temperature compensates primary air flow, comprising:
15 DEG C of dead zones are set, and when bed temperature variation range is more than theoretical bed temperature value ± 15 DEG C, it is defeated that bed temperature compensates PID progress
Out, and to it -5000~+5000 output violent change control is carried out.
Further, this method further include:
It is calculated based on oxysome fraction parameter and obtains the First air total blast volume.
Further, it is calculated based on oxysome fraction parameter and obtains the First air total blast volume, comprising:
Oxysome fraction correction coefficient K is obtained by oxygen flow regulation PI D, wherein 0.8 < K < 1.2；
As 0.88 < K < 1.12, oxysome fraction is adjusted using Secondary Air；
As oxysome fraction correction coefficient K > 1.12 or K < 0.88, it will lack after calculating or extra air quantity be by one
Secondary Boiler pressure control carries out supplement adjusting,
According to the above aspect of the present invention, by hot-water boiler air and flue system automation control method, using entire air and flue system as one
A control is whole, calculates the total blast volume finally needed by boiler load and total blast volume adaptive correction program, improves theory
The accuracy of total blast volume；The calculated result of primary air flow is pressed the co-determination of four parameters, energy by load, oxygen amount, bed temperature and bed
Enough guarantee regulating effect, does not destroy original combustion state；This ginseng of oxysome fraction is fully considered in the calculating of primary air flow
Several influences can accelerate entire air and flue system to the responding ability of oxysome fraction, while also avoid one in adjustment process
Secondary Air matches unbalance problem.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is hot-water boiler automation control method air and flue system control schematic diagram of the present invention；
Fig. 2 is hot-water boiler automation control method total blast volume adaptive correction program schematic diagram of the present invention；
Fig. 3 is hot-water boiler automation control method First air control strategy schematic diagram of the present invention；
Fig. 4 is hot-water boiler automation control method oxygen amount compensation primary air flow logic chart of the present invention；
Fig. 5 is hot-water boiler automation control method oxygen amount correction factor and Secondary Air control logic figure of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Present embodiments provide a kind of hot-water boiler air and flue system automation control method, comprising:
Based on boiler load and total blast volume adaptive correction program, calculates and obtain final required total blast volume；
Parameter is pressed based on boiler load, oxygen amount, bed temperature and bed, calculates and obtains First air total blast volume, and in the total wind of First air
Oxysome fraction parameter is added in the calculating of amount.
Invention is further described in detail below.
As shown in Figure 1, it is whole using entire air and flue system as a control, total blast volume function meter is corresponded to by boiler load
Calculate theoretical total blast volume, it is contemplated that theoretical calculation total blast volume and actual demand air quantity because air flow calibration, transducer signal acquisition and
The calculating of total blast volume joined total blast volume adaptive correction program as shown in Figure 2 by error caused by the factors such as inleakage,
The total blast volume finally needed instruction is calculated by parameters such as practical total blast volume, theoretical total blast volume, boiler instructions, improves theoretical total wind
The accuracy of amount.
In the calculating of primary air flow, as shown in Fig. 2, First air total amount is by load, oxygen amount, bed temperature and bed after its calculating
The co-determination of four parameters is pressed, can guarantee regulating effect, does not destroy original combustion state.It specifically includes: by load pair
Primary air flow function f2 (x) is answered to obtain First air coarse adjustment air quantity；Bed temperature function f3 (x) is corresponded to by load to obtain under current loads
Theoretical bed temperature value, and in this, as bed temperature compensation PID setting value, PID output be bed temperature compensate primary air flow, be arranged 15 DEG C
Dead zone, i.e., only when bed temperature variation range is more than theoretical bed temperature value ± 15 DEG C, bed temperature compensation PID is just exported, and to its into
The output violent change control of row -5000~+5000；Corresponding compensation primary air flow function f4 (x) is pressed to obtain bed pressure compensation one by bed
Secondary air quantity.
The influence of this parameter of oxysome fraction should be also fully considered in the calculating of primary air flow, as shown in Figures 3 and 4,
It first passes through oxygen flow regulation PID and obtains oxysome fraction correction coefficient K (0.8 < K < 1.2), as 0.88 < K < 1.12, it is believed that
Secondary air regulation ability is enough, and oxysome fraction is adjusted only with Secondary Air；As oxysome fraction correction coefficient K >
When 1.12 or K < 0.88, then it is assumed that Secondary Air oxygen flow regulation scarce capacity will lack after calculating or extra air quantity passes through once
Boiler pressure control carries out supplement adjusting, accelerates entire air and flue system to the responding ability of oxysome fraction, while also avoiding adjusting
A Secondary Air matches unbalance problem in the process.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of hot-water boiler air and flue system automation control method characterized by comprising
Based on boiler load and total blast volume adaptive correction program, calculates and obtain final required total blast volume；
Parameter is pressed based on boiler load, oxygen amount, bed temperature and bed, calculates and obtains First air total blast volume, comprising: pass through boiler load pair
Primary air flow function is answered to obtain First air coarse adjustment air quantity；Bed temperature function, which is corresponded to, by boiler load obtains the theory under current loads
Bed temperature value, and in this, as the setting value of bed temperature compensation PID, PID output is that bed temperature compensates primary air flow, comprising: 15 DEG C of setting
Dead zone, when bed temperature variation range is more than theoretical bed temperature value ± 15 DEG C, bed temperature compensation PID is exported, and carries out -5000 to it
~+5000 output violent change control；Corresponding compensation primary air flow function is pressed to obtain bed pressure compensation primary air flow by bed；
It is calculated based on oxysome fraction parameter and obtains the First air total blast volume, comprising: oxysome product is obtained by oxygen flow regulation PID
Score correction coefficient K, wherein 0.8 < K < 1.2；As 0.88 < K < 1.12, oxysome fraction is adjusted using Secondary Air
Section；As oxysome fraction correction coefficient K > 1.12 or K < 0.88, it will lack after calculating or extra air quantity pass through First air
Amount control carries out supplement adjusting.
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| CN201810004471.8A CN108361731B (en) | 2018-01-03 | 2018-01-03 | Hot-water boiler air and flue system automation control method |
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| CN201810004471.8A CN108361731B (en) | 2018-01-03 | 2018-01-03 | Hot-water boiler air and flue system automation control method |
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| CN112363554B (en) * | 2020-10-15 | 2022-02-11 | 四川广安发电有限责任公司 | Thermal power generating unit air volume and air pressure decoupling control method |
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| CN1202371C (en) * | 2003-07-02 | 2005-05-18 | 北京和利时系统工程股份有限公司 | Automatic regulating system for combustion process of circulating fluid bed in boiler |
| CN101225955B (en) * | 2008-01-31 | 2011-03-30 | 云南电力试验研究院（集团）有限公司电力研究院 | Automatic control method of 300 MW grading circulating fluidized bed units |
| CN101329582B (en) * | 2008-07-18 | 2010-06-02 | 东南大学 | Method for optimizing and diagnosing circulating fluid bed boiler combustion |
| US20100077947A1 (en) * | 2008-09-26 | 2010-04-01 | Foster Wheeler Energy Corporation | Method of combusting sulfur-containing fuel |
| CN101551103B (en) * | 2009-04-30 | 2010-11-10 | 东莞德永佳纺织制衣有限公司 | Automatic boiler combustion control system of circulating fluid bed |
| CN107023825B (en) * | 2016-08-31 | 2019-01-22 | 西安艾贝尔科技发展有限公司 | Fluidized-bed combustion boiler control and combustion optimizing system |
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