CN108332424A - Hot-water boiler automation control method - Google Patents
Hot-water boiler automation control method Download PDFInfo
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- CN108332424A CN108332424A CN201810004317.0A CN201810004317A CN108332424A CN 108332424 A CN108332424 A CN 108332424A CN 201810004317 A CN201810004317 A CN 201810004317A CN 108332424 A CN108332424 A CN 108332424A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The present invention relates to a kind of hot-water boiler automation control methods, including：Boiler load is calculated based on water flow and leaving water temperature；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.With leaving water temperature and water flow, core realizes the automation control of boiler to the present invention by control strategies such as spatial load forecasting, fuel control, First air control, Secondary Air control, oxygen content control, bed temperature controls in order to control.
Description
Technical field
The invention belongs to city heat supply Boiler Control field more particularly to a kind of hot-water boiler automation control sides
Method.
Background technology
With extensive use of the central heating mode in city, large size city heating boiler has gradually replaced heating station
Boiler implements concentrated supply of heating in the city, can not only mitigate atmosphere pollution using large size city heating boiler, improves using energy source effect
Rate is reduced expenses, optimum management, it is easier to be realized scientific management, be improved heating quality.
Large size city heating boiler mostly uses circulating fluidized bed boiler (CFB), main reason is that CFB boiler is different from
Coal-powder boiler, it is excellent that suitability of fuel is wide, high combustion efficiency, discharged nitrous oxides are low, load regulation rate is big, Load Regulation is fast etc.
Point, however due to the own characteristic of CFB boiler, operation mode of operation is different from grate furnace and coal-powder boiler, once it cannot in operation
Meet the particular/special requirement of its thermal parameter, easily causes phenomena such as boiler output is insufficient, efficiency of combustion is low, bed temperature is higher, seriously
Shi Genghui leads to coking blowing out.
Aspect is being automatically controlled, since heating boiler is mostly hot-water boiler, the change that controlling difficulties are had by oneself in addition to CFB boiler
The problems such as serious is coupled between amount, according to calculation of Heat Load formula：
QHeat=3600*4.19*FWater flow*(TLeaving water temperature-TReturn water temperature)；
Hot-water boiler load not only depends on water flow, also simultaneously by leaving water temperature and return water temperature joint effect,
The realization that this also results in this type boilers Automatic Control is more difficult.
It for this type of furnace of hot-water boiler, is limited by its application range, relatively imperfect at present is automatic
Control strategy, and the thermic load of heating boiler needs frequently change according to the demand of heat supply network, using manually controlling load
Mode can not only increase the operating quantity of operations staff also while increase the fluctuation in boiler process parameter tuning process.Cause
This, needs a kind of automatic control scheme applied to hot-water boiler.
Invention content
In order to solve the above technical problems, the object of the present invention is to provide a kind of hot-water boiler automation control methods, to go out
Coolant-temperature gage and water flow core in order to control, pass through spatial load forecasting, fuel control, First air control, Secondary Air control, oxygen amount control
The control strategies such as system, bed temperature control, realize the automation control of boiler.
The present invention provides a kind of hot-water boiler automation control methods, including：
Boiler load is calculated based on water flow and leaving water temperature；
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, it is based on water flow and leaving water temperature calculates boiler load, including：
The setting value of water flow and leaving water temperature is obtained, and different rate limits is carried out to setting value output, by following
Ring water pump is directly adjusted water flow；
It is calculated by calculation of Heat Load module, obtains the current thermic load setting value of boiler, and letter is converted by thermic load
Number obtains the coarse adjustment feedforward of Load Regulation；
The controlled quentity controlled variable that leaving water temperature is adjusted as PID closed loops exports boiler load by PID arithmetic.
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 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 be by one
Secondary Boiler pressure control carries out supplement adjusting.
According to the above aspect of the present invention, by hot-water boiler automation control method, the automation control of hot-water boiler is realized.
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 spatial load forecasting schematic diagram of the present invention；
Fig. 2 is hot-water boiler automation control method air and flue system control schematic diagram of the present invention；
Fig. 3 is hot-water boiler automation control method total blast volume adaptive correction program schematic diagram of the present invention；
Fig. 4 is hot-water boiler automation control method First air control strategy schematic diagram of the present invention；
Fig. 5 is hot-water boiler automation control method oxygen amount compensation primary air flow logic chart of the present invention；
Fig. 6 is hot-water boiler automation control method oxygen amount correction factor and Secondary Air control logic figure of the present invention；
Fig. 7 is the manual operation curve figure of unit of the unit under the manual method of operation；
Fig. 8 is the continuous automatic running curve graph of unit of unit application the method for 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 automation control method is present embodiments provided, including：
Boiler load is calculated based on water flow and leaving water temperature；
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.
Invention is further described in detail below.
1, spatial load forecasting scheme
There are three variables altogether in the calculation of Heat Load of water heater：Water flow, leaving water temperature and return water temperature, above three
In variable, return water temperature can not be adjusted by system, therefore when Design cooling load control program, only introduced water flow and gone out
Two parametric variables of coolant-temperature gage, as shown in Figure 1, water flow and leaving water temperature hand behaviour station are in tracking when boiler master is manual
State tracks water flow and leaving water temperature measured value respectively, and after boiler master input is automatic, flow is carried out out by hand behaviour station
The setting of amount and leaving water temperature, and different rate limits is carried out to the output of its setting value, by water circulating pump directly to going out flow
Amount is adjusted, and after the calculating of calculation of Heat Load module, obtains the current thermic load setting value of boiler, and convert by thermic load
Function f1 (x) obtains the coarse adjustment feedforward of Load Regulation, and the controlled quentity controlled variable that leaving water temperature is adjusted as PID closed loops passes through PID arithmetic
Boiler load is exported, the calculating of air quantity, coal amount, bed temperature, oxygen amount is respectively used to.
2, fuel control scheme
Fuel control uses " one drags four " control mode, controls the output of four feeders simultaneously with a PID controller,
To respond demand of the boiler load variation to fuel.
3, air and flue system control program
As shown in Fig. 2, 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 3 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 figure 3, 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.It specifically includes：Primary air flow function f2 (x) is corresponded to by load
Obtain First air coarse adjustment air quantity；Bed temperature function f3 (x) is corresponded to by load and obtains the theoretical bed temperature value under current loads, and with this
The setting value of PID is compensated as bed temperature, PID outputs are that bed temperature compensates primary air flow, and 15 DEG C of dead zones are arranged, i.e., only when bed temperature changes
When range is more than theoretical bed temperature value ± 15 DEG C, bed temperature compensation PID is just exported, and -5000~+5000 output is carried out to it
Amplitude limit controls；Corresponding compensation primary air flow function f4 (x) is pressed to obtain bed pressure compensation primary air flow by bed.
The influence of this parameter of oxysome fraction should be also fully considered in the calculating of primary air flow, as shown in Figures 4 and 5,
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.
Certain Circulating Fluidized Bed Hot Water Boiler (QXF168-1.6/130/70-M3), specified quantity of heat production 168MW, it is specified go out water temperature
130 DEG C of degree, 70 DEG C of specified return water temperature.Before control method provided in this embodiment, as shown in fig. 7, boiler is chronically at
The manual method of operation, once there is varying load condition, system need it is multiple manually adjust the period and could restore stable, and in practical fortune
Repeatedly occurs leaving water temperature overheating problem in row.After control method provided in this embodiment, as shown in figure 8, boiler is surely born
Leaving water temperature and two parameter operating statuses of water flow are steady in lotus operational process, and parameter is controlled in load alternation process and is become
It is small to measure overshoot, and can restore to stablize in the very fast time.
Hot-water boiler automation control method provided in this embodiment, with leaving water temperature and water flow core in order to control,
By control strategies such as spatial load forecasting, fuel control, First air control, Secondary Air control, oxygen content control, bed temperature controls, realize
The automation control of boiler.
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 (6)
1. a kind of hot-water boiler automation control method, which is characterized in that including：
Boiler load is calculated based on water flow and leaving water temperature；
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 automation control method according to claim 1, which is characterized in that be based on water flow and water outlet
Temperature computation boiler load, including：
The setting value of water flow and leaving water temperature is obtained, and different rate limits is carried out to setting value output, by recirculated water
Pump is directly adjusted water flow；
It is calculated by calculation of Heat Load module, obtains the current thermic load setting value of boiler, and function call is converted by thermic load
Coarse adjustment to Load Regulation feedovers；
The controlled quentity controlled variable that leaving water temperature is adjusted as PID closed loops exports boiler load by PID arithmetic.
3. hot-water boiler automation control method according to claim 2, which is characterized in that based on boiler load, 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.
4. hot-water boiler automation control method according to claim 3, which is characterized in that correspond to bed by boiler load
Warm function obtains the theoretical bed temperature value under current loads, and the setting value of PID is compensated in this, as bed temperature, and PID outputs are bed temperature
Primary air flow is compensated, 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.
5. hot-water boiler automation control method according to claim 4, which is characterized in that further include：
It is calculated based on oxysome fraction parameter and obtains the First air total blast volume.
6. hot-water boiler automation control method according to claim 5, which is characterized in that be based on oxysome fraction parameter
It calculates and 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201810004317.0A CN108332424B (en) | 2018-01-03 | 2018-01-03 | Automatic control method for hot water boiler |
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| CN201810004317.0A CN108332424B (en) | 2018-01-03 | 2018-01-03 | Automatic control method for hot water boiler |
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| CN108332424B CN108332424B (en) | 2020-08-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154688A (en) * | 2021-04-21 | 2021-07-23 | 瑞美(中国)热水器有限公司 | Control method of full-premixing condensing type gas positive displacement water heater and water heater |
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| CN1441193A (en) * | 2002-07-01 | 2003-09-10 | 北京和利时系统工程股份有限公司 | Automatic regulation method for comprehensive combustion in circular fluidized bed boiler |
| CN101551103A (en) * | 2009-04-30 | 2009-10-07 | 东莞德永佳纺织制衣有限公司 | Automatic boiler combustion control system of circulating fluid bed |
| CN102109172A (en) * | 2009-12-24 | 2011-06-29 | 江苏方天电力技术有限公司 | Fuel-water ratio control method for supercritical and ultra supercritical unit |
| CN103197547A (en) * | 2013-02-28 | 2013-07-10 | 哈尔滨工业大学 | Peak-shaving boiler heating station heating demand optimized dispatching method using particle swarm optimization |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08114506A (en) * | 1994-10-17 | 1996-05-07 | Kawasaki Heavy Ind Ltd | Method and device for estimating temperature of gas |
| CN1441193A (en) * | 2002-07-01 | 2003-09-10 | 北京和利时系统工程股份有限公司 | Automatic regulation method for comprehensive combustion in circular fluidized bed boiler |
| CN101551103A (en) * | 2009-04-30 | 2009-10-07 | 东莞德永佳纺织制衣有限公司 | Automatic boiler combustion control system of circulating fluid bed |
| CN102109172A (en) * | 2009-12-24 | 2011-06-29 | 江苏方天电力技术有限公司 | Fuel-water ratio control method for supercritical and ultra supercritical unit |
| CN103197547A (en) * | 2013-02-28 | 2013-07-10 | 哈尔滨工业大学 | Peak-shaving boiler heating station heating demand optimized dispatching method using particle swarm optimization |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113154688A (en) * | 2021-04-21 | 2021-07-23 | 瑞美(中国)热水器有限公司 | Control method of full-premixing condensing type gas positive displacement water heater and water heater |
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| CN108332424B (en) | 2020-08-21 |
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