CN108361731A - 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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- CN108361731A CN108361731A CN201810004471.8A CN201810004471A CN108361731A CN 108361731 A CN108361731 A CN 108361731A CN 201810004471 A CN201810004471 A CN 201810004471A CN 108361731 A CN108361731 A CN 108361731A
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The present invention relates to a kind of hot-water boiler air and flue system automation control methods, including：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.Entire air and flue system is whole 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 result of calculation of primary air flow is pressed the co-determination of four parameters by load, oxygen amount, bed temperature and bed, can be ensured 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 responding ability of the entire air and flue system to 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 technology
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 proportioning mode of First air and Secondary Air also can be because current
Operating mode it is different and be affected, simple control bed temperature and oxygen amount often cause the unbalance of Secondary Air proportioning, 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, ensure the bed material in burner hearth normally fluidisation and at the same time and the main transmission of heat and carry medium in burner hearth,
Its size influences the adjusting of bed temperature in burner hearth, and in traditional fluid bed control, First air adjusted as bed temperature one is often
With means, therefore in previous Automatic Control Strategy, bed temperature, which is adjusted, can all use First air to adjust, 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 influenced 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 change bed temperature indirectly by the state of change burning, therefore using primary
Although it is the most directly and quick in effect 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 the air capacity and strength imparting material supplemented needed for fuel combustion
The back mixing appropriate distribution for adjusting temperature field in furnace simultaneously, makes flue-gas temperature be more evenly distributed.In traditional fluid bed control, two
The means that secondary wind is often adjusted as oxygen flow regulation and auxiliary bed temperature, Secondary Air is feasible as the main means of oxygen flow regulation
, a large amount of experiment 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
Middle excessive or too small situation of contributing, therefore oxygen flow regulation is carried out using only Secondary Air, can meet the needs of in control, but can not
Ensure 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, that is, reduces First air, increases Secondary Air to improve bed temperature, but Secondary Air temperature compared with
It is low, in the case that coal-fired moisture is larger, 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 can lead to boiler coke blowing out, therefore this method has limitation, can not extensive use.
Invention content
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, including：
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, boiler load, oxygen amount, bed temperature and bed are based on and press parameter, calculated and obtain First air total blast volume, including：
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 outputs 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 outputs are bed temperature compensation primary air flow, including：
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
Go out, and carries out -5000~+5000 output violent change control to it.
Further, this method further includes：
It is calculated based on oxysome fraction parameter and obtains the First air total blast volume.
Further, it is based on oxysome fraction parameter and calculates the acquisition First air total blast volume, including：
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 result of calculation of primary air flow is pressed the co-determination of four parameters, energy by load, oxygen amount, bed temperature and bed
Enough ensure 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 responding ability of the entire air and flue system to oxysome fraction, while also avoid one in adjustment process
Secondary Air matches unbalance problem.
Above description is only the general introduction of technical solution 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, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
Description of the drawings
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 implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
A kind of hot-water boiler air and flue system automation control method is present embodiments provided, including：
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, entire air and flue system is whole 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 is added 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 for pressing four parameters, can ensure regulating effect, not destroy original combustion state.It specifically includes：Pass through 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 compensate 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 pass through it is primary
Boiler pressure control carries out supplement adjusting, accelerates responding ability of the entire air and flue system to 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 (5)
1. a kind of hot-water boiler air and flue system automation control method, which is characterized in that including：
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.
2. hot-water boiler air and flue system automation control method according to claim 1, which is characterized in that negative based on boiler
Lotus, oxygen amount, bed temperature and bed press parameter, calculate and obtain First air total blast volume, including：
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 compensates PID in this, as bed temperature
Setting value, PID output be bed temperature compensate primary air flow；
Corresponding compensation primary air flow function is pressed to obtain bed pressure compensation primary air flow by bed.
3. hot-water boiler air and flue system automation control method according to claim 2, which is characterized in that negative by boiler
Lotus corresponds to bed temperature function and obtains the theoretical bed temperature value under current loads, and the setting value of PID is compensated in this, as bed temperature, and PID is defeated
Go out and compensates primary air flow for bed temperature, including：
15 DEG C of dead zones are set, when bed temperature variation range is more than theoretical bed temperature value ± 15 DEG C, bed temperature compensation PID is exported, and
- 5000~+5000 output violent change control is carried out to it.
4. hot-water boiler air and flue system automation control method according to claim 3, which is characterized in that further include：
It is calculated based on oxysome fraction parameter and obtains the First air total blast volume.
5. hot-water boiler air and flue system automation control method according to claim 4, which is characterized in that accumulated based on oxysome
Score parameter, which calculates, obtains the First air total blast volume, including：
Oxysome fraction correction coefficient K is obtained by oxygen flow regulation PID, 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 pass through First air
Amount control carries out supplement adjusting.
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| CN108361731B CN108361731B (en) | 2019-08-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112363554A (en) * | 2020-10-15 | 2021-02-12 | 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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| CN1480682A (en) * | 2003-07-02 | 2004-03-10 | 北京和利时***工程股份有限公司 | Automatic regulating system for combustion process of circulating fluid bed in boiler |
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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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| CN108361731B (en) | 2019-08-06 |
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