CN103697494A - Boiler air quantity control method and system - Google Patents
Boiler air quantity control method and system Download PDFInfo
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- CN103697494A CN103697494A CN201310745490.3A CN201310745490A CN103697494A CN 103697494 A CN103697494 A CN 103697494A CN 201310745490 A CN201310745490 A CN 201310745490A CN 103697494 A CN103697494 A CN 103697494A
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Abstract
A boiler air quantity control method includes: acquiring a load instruction and actual load, and calculating to obtain a main control air quantity value; acquiring actual water supply control parameters, and calculating the correction coefficient of the water supply control parameters; acquiring CO concentration, and obtaining the correction coefficient of the CO concentration; calculating an air quantity reference value according to the main control air quantity value, the correction coefficient of the water supply control parameters and the correction coefficient of the CO concentration, comparing the air quantity reference value with a lowest air quantity value, and the using the larger one of the two as the air quantity set value; regulating and controlling air quantity according to the air quantity set value. The method has the advantages that the water supply control parameters reflects the efficiency of a turbine, the CO concentration reflects the combustion efficiency of a boiler, an air quantity-load mode corrected by the water supply control parameters is used to perform coarse regulation of air quantity, and the CO contraction correction is used to perform fine regulation of the air quantity; the influence of fuel value on the boiler air quantity is avoided, the problem that zirconia measurement in an oxygen quantity correction system is influenced by factors such as environmental temperature interference is solved, optimal regulation of the boiler air quantity is achieved, and unit efficiency is increased.
Description
Technical field
The present invention relates to Boiler Control field, particularly relate to a kind of boiler air quantity control method and system.
Background technology
In industrial production, boiler is power-equipment important in production process, and the quality of its burning optimization directly has influence on the stability of relevant apparatus production process.The burning optimization adjustment of boiler operatiopn, according to the index of combustion process quality, is optimized test to affecting the major parameter of combustion conditions, makes combustion process reach safe and reliable, economical and efficient, oligosaprobic requirement.The principal element that affects combustion conditions has into stove coal characteristic, air distribution mode and air quantity control etc.Wherein, air quantity is controlled the variation that directly affects boiler operatiopn oxygen amount, and the variation of operation oxygen amount not only directly affects the variation of heat loss due to exhaust gas and boiler thermal output, also causes the variation of other parameters.Therefore, boiler air quantity is controlled most important to the burning optimization of boiler.
Usually, the implementation that boiler air quantity is controlled mainly contains air quantity-fuel mode and air quantity-load pattern.Air quantity-fuel mode is air quantity setting value and enter stove fuel quantity and be functional relation.But this kind of pattern is when the calorific value that enters stove fuel changes, the stove fuel quantity that enters of same load changes, and boiler air quantity also changes, but the theoretical air requirement that Actual combustion needs is substantially constant, and often boiler operatiopn air quantity is bigger than normal, has reduced the efficiency of unit.
The implementation of another kind of air quantity-load, air quantity setting value is the function of unit load, which has solved fuel value and has changed the impact on boiler air quantity, but needs attached oxygen-adding amount update the system, makes boiler obtain a suitable air quantity.But the quality that furnace air and coal dust mix situation can not be directly reacted in the measurement of oxygen amount, only can provide excess air coefficient, even if oxygen amount is sufficient, if mix, badly cause that in stove, local anoxic also can cause incomplete combustion loss increase.The problems such as flue gas leakage and the layering of flue composition cause oxygen content measurement also to have certain error, cause the oxygen value that monitors not representative, make boiler cannot maintain a suitable air quantity, have reduced unit efficiency.
Summary of the invention
Based on this, be necessary for the oxygen value monitoring not representatively, make boiler cannot maintain a suitable air quantity, reduced the problem of unit efficiency, a kind of boiler air quantity control method and system are provided.
A boiler air quantity control method, comprises the following steps:
Obtain load instruction and the actual load of boiler unit, and calculate master control airflow value according to air quantity-function of load;
Obtain actual in water management parameter, and according to actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function;
Obtain the CO concentration of boiler back end ductwork, and process and signal transfer function conversion acquisition CO concentration correction coefficient through signal;
According to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, gets its large one and sets value as air quantity;
According to described air quantity setting value regulation and control air quantity.
Therein in an embodiment, described in obtain load instruction and the actual load of boiler unit, and according to air quantity-function of load, calculate the step of master control airflow value, specifically comprise the following steps:
Obtain load instruction and the actual load of boiler unit;
According to described load instruction and rated load, obtain load instruction rate;
Described in substitution, load instruction rate in described air quantity-function of load, calculate the first airflow value;
According to described actual load and rated load, obtain actual load rate;
Described in substitution, actual load rate, in described air quantity-function of load, calculates the second airflow value;
More described the first airflow value and the second airflow value, get its large one for master control airflow value.
In an embodiment, the relational expression of described air quantity-function of load is as follows therein:
Q
f=MAX(30，L
r)
Wherein, Q
ffor air quantity, L
rfor rate of load condensate, described rate of load condensate comprises load instruction rate or actual load rate.
Therein in an embodiment, described in obtain actual in water management parameter, and according to actual load, give water management parameter-function of load and calculate the step to water management parameter correction factor to water management parameter correction function, specifically comprise the following steps:
Described in substitution, actual load rate, in the described water management parameter-function of load of giving, calculates design to water management parameter;
Obtain actual in water management parameter, using described reality to water management parameter and described design to the ratio of water management parameter as to water management parameter correction ratio;
Described in substitution, give water management parameter correction ratio in described to water management parameter correction function, calculate to water management parameter correction factor.
In an embodiment, described water management parameter-function of load relational expression of giving is as follows therein:
Q
sj=L
r
Wherein, Q
sjfor giving water management parameter, L
rfor rate of load condensate, described rate of load condensate comprises load instruction rate or actual load rate.
In an embodiment, the described water management parameter correction function relational expression of giving is as follows therein:
K
s=0.9, work as Q
fcat/ Q
sj≤ 0.8
K
s=0.9+0.5 * (Q
fcat/ Q
sj-0.8), work as 0.8<Q
fcat/ Q
sj<1.2
K
s=1.1, work as Q
fcat/ Q
sj>=1.2
Wherein, Q
fcatfor boiler is actual, give water management parameter, Q
sjboiler design is to water management parameter (%), K
sfor giving water management parameter correction factor.
Therein in an embodiment, described in obtain the CO concentration of boiler back end ductwork, and process and the step of signal transfer function conversion acquisition CO concentration correction coefficient through signal, specifically comprise the following steps:
Obtain boiler back end ductwork CO concentration;
Described CO concentration is carried out filtering and added damping logical process;
Input after filtering and the described CO concentration that adds damping logical process in CO Correction and Control device, draw CO concentration standard signal;
According to described signal transfer function, change described CO concentration standard signal, obtain CO concentration correction coefficient.
In an embodiment, described signal transfer function relational expression is as follows therein:
K
co=0.9+0.002×P
Wherein, P is CO concentration standard signal, K
cofor CO concentration correction coefficient.
In an embodiment, described is main steam flow or feedwater flow to water management parameter therein.
A boiler air quantity control system, comprising:
Master control airflow value acquisition module, obtains load instruction and the actual load of boiler unit, and calculates master control airflow value according to air quantity-function of load;
Give water management parameter correction factor acquisition module, obtain the reality of boiler to water management parameter, and according to described actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function;
CO concentration correction coefficient acquisition module, obtains the CO concentration of boiler back end ductwork, and processes and signal transfer function conversion acquisition CO concentration correction coefficient through signal;
Air quantity control module, according to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, get its large one and set value as air quantity, and according to described air quantity setting value regulation and control air quantity.
Above-mentioned boiler air quantity control method and system, by introducing to water management parameter and two air quantity of CO concentration, control parameter, give the efficiency of water management parameter reaction steam turbine, the efficiency of combustion of CO concentration-response boiler, employing is carried out the coarse adjustment of air quantity to the air quantity-load pattern of water management parameter correction, adopts CO concentration correction to carry out the fine tuning of air quantity.Not only overcome the impact of fuel value on boiler air quantity, also avoid adopting zirconia measurement in oxygen consuming amount update the system and be subject to the factor impacts such as environment temperature is disturbed, the stifled ash of probe, the optimization that has realized boiler air quantity regulates, improve accuracy and reliability that boiler air quantity regulates, improved business efficiency and unit efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of an embodiment boiler air quantity control method;
Fig. 2 is the schematic flow sheet that an embodiment boiler air quantity control method obtains master control airflow value;
Fig. 3 is that an embodiment boiler air quantity control method obtains the schematic flow sheet to water management parameter correction factor;
Fig. 4 is the schematic flow sheet that an embodiment boiler air quantity control method obtains CO concentration correction coefficient;
Fig. 5 is the schematic flow sheet that an embodiment boiler air quantity control method obtains air quantity setting value;
Fig. 6 is the module diagram of an embodiment boiler air quantity control system;
Fig. 7 is the air quantity-function of load figure of an embodiment boiler air quantity control method;
Fig. 8 be an embodiment boiler air quantity control method give water management parameter-function of load figure;
Fig. 9 be an embodiment boiler air quantity control method give water management parameter correction function figure;
Figure 10 is the CO concentration correction functional arrangement of an embodiment boiler air quantity control method.
The specific embodiment
As shown in Figure 1, a kind of boiler air quantity control method, comprises the following steps:
Step S110, obtains load instruction and the actual load of boiler unit, and calculates master control airflow value according to air quantity-function of load.
The load instruction of boiler unit is to outside burden requirement instruction, and target load instruction is selected and processed, and becomes actual load instruction, as the power given value signal that is suitable for boiler operating states of the units.Actual load is by actual measurement, obtains the actual load value that data the certain algorithm of process obtain boiler unit.
Obtain after the load instruction and actual load of boiler, and through a series of calculating, obtain master control airflow value according to air quantity-function of load.
In an embodiment, the functional relation of air quantity-function of load is therein:
Q
f=MAX(30，L
r)
Q in formula
ffor air quantity, L
rfor rate of load condensate, rate of load condensate comprises load instruction rate or actual load rate, and unit is %.As shown in Figure 7, the abscissa of air quantity-function of load is boiler unit rate of load condensate, and ordinate is boiler combustion Air Quantity Required.Be understandable that, the relational expression of air quantity-function of load is according to the difference of boiler unit and difference, and the calculation of parameter by boiler obtains, and in other embodiments, also can through calculating, obtain different function expressions according to the parameter of boiler unit.
Step S120, obtain actual in water management parameter, and according to actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function.
Boiler give water management parameter, can be main steam flow, also can be feedwater flow.In the present embodiment, boiler is main steam flow to water management parameter.Main steam flow and feedwater flow can be measured by main steam flow meter, as orifice flowmeter, also can obtain by certain calculating, as adopted Fu Liugeer formula to calculate, obtain main steam flow.
In an embodiment, give water management parameter-function of load relational expression as follows therein:
Q
sj=L
r
Q in formula
sjfor giving water management parameter, L
rfor rate of load condensate, rate of load condensate comprises load instruction rate or actual load rate, and unit is %.As shown in Figure 8, giving water management parametric function abscissa is rate of load condensate, and ordinate is to water management parameter.It is pointed out that to water management parameter-function of load relational expression and also can be other expression formula, can adjust according to the actual conditions of boiler unit.。
Give water management parameter correction function relational expression as follows:
K
s=0.9, work as Q
fcat/ Q
sj≤ 0.8
K
s=0.9+0.5 * (Q
fcat/ Q
sj-0.8), work as 0.8<Q
fcat/ Q
sj<1.2
K
s=1.1, work as Q
fcat/ Q
sj>=1.2
In formula, Q
fcatfor boiler is actual, give water management parameter, Q
sjfor boiler design is to water management parameter (%), K
sfor giving water management parameter correction factor.As shown in Figure 9, abscissa is that boiler feedwater is controlled parameter/design to water management parameter, and ordinate is to water management parameter correction factor.It is pointed out that to water management parameter correction function relational expression and also can be other expression formula, can adjust according to the actual conditions of boiler unit are different.
Because actual efficiency and the design efficiency of unit exists certain deviation, generally unit exists steam leakage, temperature not to reach design load, circulating cooling water temperature higher than reasons such as design loads, makes unit actual efficiency lower than design efficiency.Now the water management parameter of giving of boiler can be higher than design load, the fuel value that enters boiler is higher than design load, required air quantity is also large than design load, the water management parameter correction function of giving of boiler obtains by the efficiency calculation of specific boiler unit, thereby can revise the water management parameter of giving of boiler.
Step S130, obtains the CO concentration of boiler back end ductwork, and processes and signal transfer function conversion acquisition CO concentration correction coefficient through signal.
In an embodiment, the functional expression of signal transfer function is therein:
K
co=0.9+0.002×P
In formula, P is CO concentration standard signal (%), K
cofor CO concentration correction coefficient.As shown in figure 10, signal transfer function abscissa is CO concentration standard signal, and ordinate is CO concentration correction coefficient.The functional expression that it is pointed out that signal transfer function is according to the difference of boiler unit and difference, and the calculation of parameter by boiler obtains.
CO concentration in boiler smoke can be reacted the efficiency of combustion of boiler.Generally, under certain load, along with the air quantity of boiler increases, the CO concentration in flue gas declines, and when CO concentration in flue gas is higher, the operation deficiency in draught of boiler, need to increase the operation air quantity of boiler unit.
Step S140, according to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, gets its large one and sets value as air quantity.
Minimum air quantity is and in boiler design, reaches certain load and the minimum airflow value of efficiency, thereby the air quantity of boiler unit is controlled on certain value range, guarantees efficiency and the security performance of boiler.
Step S150, according to described air quantity setting value regulation and control air quantity.
According to described air quantity setting value regulation and control air quantity, can realize by blast volume controller, by in air quantity setting value input blast volume controller, as the setting value SP of blast volume controller, blast volume controller regulates the air quantity of boiler unit, airflow value is adjusted to air quantity setting value, thereby realizes the optimal control of air quantity.
Above-mentioned boiler air quantity control method, by introducing to water management parameter and two air quantity of CO concentration, control parameter, give the efficiency of water management parameter reaction steam turbine, the efficiency of combustion of CO concentration-response boiler, employing is carried out the coarse adjustment of air quantity to the air quantity-load pattern of water management parameter correction, adopts CO concentration correction to carry out the fine tuning of air quantity.Not only overcome the impact of fuel value on boiler air quantity, also avoid adopting zirconia measurement in oxygen consuming amount update the system and be subject to the factor impacts such as environment temperature is disturbed, the stifled ash of probe, the optimization that has realized boiler air quantity regulates, improve accuracy and reliability that boiler air quantity regulates, improved business efficiency and unit efficiency.
In addition, give water management parameter and CO concentration be the control parameter that reliability is higher in boiler control system, easily measure and accuracy high, air quantity-function of load and obtain to water management parameter-function of load according to boiler design parameter, does not need measurement.So, do not add any measurement device, be convenient to site layout project and application, reduced operating cost, also improved accuracy and reliability that air quantity regulates, improved business efficiency and unit efficiency.
Refer to Fig. 2, in an embodiment, step S110 obtains load instruction and the actual load of boiler unit therein, and calculates master control airflow value according to air quantity-function of load, specifically comprises the following steps:
Step S111, obtains load instruction and the actual load of boiler unit.
Step S112, obtains load instruction rate according to described load instruction and rated load.
Wherein, rated load can be determined according to the design parameter of boiler, and such as rated load is 600, the instruction of loading is divided by 600 acquisition load instruction rates.
Step S113, loads instruction rate in described air quantity-function of load described in substitution, calculates the first airflow value.
As shown in Figure 7, the abscissa of air quantity-function of load is boiler unit rate of load condensate, and ordinate is boiler combustion Air Quantity Required, by load instruction rate substitution air quantity-function of load by calculating the first airflow value.
Step S114, obtains actual load rate according to described actual load and rated load.Actual load, divided by rated load, can be obtained to actual load rate.
Step S115, actual load rate, in described air quantity-function of load, calculates the second airflow value described in substitution.The second airflow value is identical with the acquisition methods of the first airflow value, by actual load rate substitution air quantity-function of load, by calculating, obtains the second airflow value.
Step S116, more described the first airflow value and the second airflow value, get its large one for master control airflow value.
The first airflow value calculates through substitution function by load instruction, the second airflow value is that feedback loading substitution function calculates acquisition by actual load, the first airflow value and the second airflow value are compared, get and when its large one can realize boiler application of load, first add air quantity, rear refuelling, during load shedding, first subtract fuel, then the function of checking amount.
Refer to Fig. 3, therein in an embodiment, step S120 obtains actual in water management parameter, and according to actual load, give water management parameter-function of load and calculate and obtain to water management parameter correction factor to water management parameter correction function, specifically comprise the following steps:
Step S122, actual load rate, in the described water management parameter-function of load of giving, calculates design to water management parameter described in substitution.
Giving water management parameter-function of load abscissa is rate of load condensate, and ordinate is to water management parameter, by the substitution of actual load rate is obtained to design to water management parameter to water management parameter-function of load.
Step S124, obtain actual in water management parameter, using described reality to water management parameter and described design to the ratio of water management parameter as to water management parameter correction ratio.
By measurement mechanism or certain algorithm, obtain reality to water management parameter, and give water management parameter divided by designing to water management gain of parameter to water management parameter correction ratio by reality.
Step S126, give described in substitution water management parameter correction ratio in described to water management parameter correction function, calculate to water management parameter correction factor.
Give water management parameter correction function abscissa be boiler feedwater control parameter/design to water management parameter to water management parameter correction factor, ordinate is to water management parameter correction factor, will be updated to water management parameter correction function and calculate to water management parameter correction factor to water management parameter correction ratio.Be understandable that, when the measurement to water management parameter is bigger than normal or less than normal, while there is larger fluctuation, modify to water management parameter correction function.
Refer to Fig. 4, in an embodiment, step S130 obtains the CO concentration of boiler back end ductwork therein, and processes and signal transfer function conversion acquisition CO concentration correction coefficient through signal, specifically comprises the following steps:
Step S132, obtains boiler back end ductwork CO concentration.
Obtaining of CO concentration can be obtained by being arranged on the CO probe sampler of back-end ductwork, thereby to monitor in real time the quality that CO concentration is understood combustion case in stove, find in time local anoxia phenomenon etc., also can rationally adjust stove fuel and air distribution mode by the analysis of CO concentration, guarantee the uniformity that oxygen amount distributes.
Step S134, filtering, adds CO concentration value described in damping logical process.
CO checkout gear can obtain the CO concentration of boiler back end ductwork, because CO concentration is a parameter that fluctuation is larger, unsuitable direct as controlling parameter, so CO concentration also needs to process and could pass through signal transfer function conversion acquisition CO concentration correction coefficient through certain signal.Filtering, add the signals such as damping logic and be treated to a kind of specific embodiment that previously described signal is processed.
Step S136, inputs the CO concentration value of described signal processing in described CO Correction and Control device, draws CO concentration standard signal.The CO concentration value of processing through signal is as the PV value of the CO of CO Correction and Control device, and CO Correction and Control device, according to the PV value of described CO and CO setting value SP, is exported a standard signal that scope is 0～100.Wherein, the CO of CO Correction and Control device setting value SP refers to the default concentration value of CO in boiler tail flue gas, as 100ppm, is that the combustion characteristics under specific coal is determined according to specific boiler, can be set by operations staff.
When the actual measured value of CO is 500ppm, show deficiency in draught, output signal is greater than 50, and as 70, staff can judge that whether air quantity is enough according to this.
Be understandable that, can realize CO Correction and Control device automatically and manual switchover, when CO concentration insensitive to boiler total blast volume, or while moving other specific boiler instructions, can exit CO concentration correction, and directly export corrected signal by operations staff, thereby regulate boiler unit air quantity setting value.
Step S138, changes described CO concentration standard signal according to described signal transfer function, obtains CO concentration correction coefficient.
Signal transfer function abscissa is CO concentration standard signal, and ordinate is CO concentration correction coefficient, and CO concentration standard signal is splashed into signal transfer function, obtains CO concentration correction coefficient.Be understandable that, CO concentration correction coefficient also can be stood to realize by M/A and be switched, and realizes manually input.
Refer to Fig. 5, therein in an embodiment, step S140 is according to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, get its large one and set value as air quantity, specifically comprise the following steps:
Step S142, by described master control airflow value and describedly multiply each other to water management parameter correction factor to obtain the 3rd airflow value.
Step S144, obtains air quantity setting value by described the 3rd airflow value and described CO concentration correction multiplication.
Step S146, more described air quantity reference value and minimum air quantity, get its large one setting value of the air quantity as air quantity PID.
As shown in Figure 6, also provide a kind of boiler air quantity control system, comprised master control air quantity acquisition module 110, give water management parameter correction factor acquisition module 120, CO concentration correction coefficient acquisition module 130 and air quantity control module 140.
Master control air quantity acquisition module 110 obtains load instruction and the actual load of boiler unit, and calculates master control airflow value according to air quantity-function of load.The reality of obtaining boiler to water management parameter correction factor acquisition module 120 is to water management parameter, and according to described actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function, thereby control the efficiency of combustion of boiler.CO concentration correction coefficient acquisition module 130, obtains the CO concentration of boiler back end ductwork, and processes and signal transfer function conversion acquisition CO concentration correction coefficient through signal.Air quantity control module 140 is according to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, getting its large one sets value as air quantity, and according to the air quantity of described air quantity set point adjustment boiler, realize the optimal control of air quantity.
Above-mentioned boiler air quantity control system, by introducing these two air quantity of CO concentration that relate to water management parameter and CO concentration correction coefficient acquisition module 130 relate to water management parameter correction factor acquisition module 120, control parameters, give the efficiency of water management parameter reaction steam turbine, the efficiency of combustion of CO concentration-response boiler, air quantity control module 140 adopts the air quantity-load pattern to the correction of water management parameter to carry out the coarse adjustment of air quantity, adopts CO concentration correction to carry out the fine tuning of air quantity.Not only overcome the impact of fuel value on boiler air quantity, also avoid adopting zirconia measurement in oxygen consuming amount update the system and be subject to the factor impacts such as environment temperature is disturbed, the stifled ash of probe, the optimization that has realized boiler air quantity regulates, improve accuracy and reliability that boiler air quantity regulates, improved business efficiency and unit efficiency.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a boiler air quantity control method, is characterized in that, comprises the following steps:
Obtain load instruction and the actual load of boiler unit, and calculate master control airflow value according to air quantity-function of load;
Obtain actual in water management parameter, and according to actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function;
Obtain the CO concentration of boiler back end ductwork, and process and signal transfer function conversion acquisition CO concentration correction coefficient through signal;
According to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, gets its large one and sets value as air quantity;
According to described air quantity setting value regulation and control air quantity.
2. boiler air quantity control method according to claim 1, is characterized in that, described in obtain load instruction and the actual load of boiler unit, and according to air quantity-function of load, calculate the step of master control airflow value, specifically comprise the following steps:
Obtain load instruction and the actual load of boiler unit;
According to described load instruction and rated load, obtain load instruction rate;
Described in substitution, load instruction rate in described air quantity-function of load, calculate the first airflow value;
According to described actual load and rated load, obtain actual load rate;
Described in substitution, actual load rate, in described air quantity-function of load, calculates the second airflow value;
More described the first airflow value and the second airflow value, get its large one for master control airflow value.
3. boiler air quantity control method according to claim 2, is characterized in that, the relational expression of described air quantity-function of load is as follows:
Q
f=MAX(30，L
r)
Wherein, Q
ffor air quantity, L
rfor rate of load condensate, described rate of load condensate comprises load instruction rate or actual load rate.
4. boiler air quantity control method according to claim 2, it is characterized in that, the described reality of obtaining is to water management parameter, and according to actual load, give water management parameter-function of load and calculate the step to water management parameter correction factor to water management parameter correction function, specifically comprise the following steps:
Described in substitution, actual load rate, in the described water management parameter-function of load of giving, calculates design to water management parameter;
Obtain actual in water management parameter, using described reality to water management parameter and described design to the ratio of water management parameter as to water management parameter correction ratio;
Described in substitution, give water management parameter correction ratio in described to water management parameter correction function, calculate to water management parameter correction factor.
5. boiler air quantity control method according to claim 1, is characterized in that, described water management parameter-function of load relational expression of giving is as follows:
Q
sj=L
r
Wherein, Q
sjfor giving water management parameter, L
rfor rate of load condensate, described rate of load condensate comprises load instruction rate or actual load rate.
6. boiler air quantity control method according to claim 1, is characterized in that, the described water management parameter correction function relational expression of giving is as follows:
K
s=0.9, work as Q
fcat/ Q
sj≤ 0.8
K
s=0.9+0.5 * (Q
fcat/ Q
sj-0.8), work as 0.8<Q
fcat/ Q
sj<1.2
K
s=1.1, work as Q
fcat/ Q
sj>=1.2
Wherein, Q
fcatfor boiler is actual, give water management parameter, Q
sjboiler design is to water management parameter (%), K
sfor giving water management parameter correction factor.
7. boiler air quantity control method according to claim 1, is characterized in that, described in obtain the CO concentration of boiler back end ductwork, and process and the step of signal transfer function conversion acquisition CO concentration correction coefficient through signal, specifically comprise the following steps:
Obtain boiler back end ductwork CO concentration;
Described CO concentration is carried out filtering and added damping logical process;
Input after filtering and the CO concentration that adds damping logical process in CO Correction and Control device, draw CO concentration standard signal;
According to described signal transfer function, change described CO concentration standard signal, obtain CO concentration correction coefficient.
8. boiler air quantity control method according to claim 1, is characterized in that, described signal transfer function relational expression is as follows:
K
co=0.9+0.002×P
Wherein, P is CO concentration standard signal, K
cofor CO concentration correction coefficient.
9. according to the boiler air quantity control method described in claim 1～8 any one, it is characterized in that, described is main steam flow or feedwater flow to water management parameter.
10. a boiler air quantity control system, is characterized in that, comprising:
Master control airflow value acquisition module, obtains load instruction and the actual load of boiler unit, and calculates master control airflow value according to air quantity-function of load;
Give water management parameter correction factor acquisition module, obtain the reality of boiler to water management parameter, and according to described actual load, give water management parameter-function of load and calculate to water management parameter correction factor to water management parameter correction function;
CO concentration correction coefficient acquisition module, obtains the CO concentration of boiler back end ductwork, and processes and signal transfer function conversion acquisition CO concentration correction coefficient through signal;
Air quantity control module, according to described master control airflow value, to water management parameter correction factor and CO concentration correction coefficient calculations air quantity reference value, the minimum airflow value that more described air quantity reference value and boiler unit are default, get its large one and set value as air quantity, and according to described air quantity setting value regulation and control air quantity.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657585B (en) * | 2019-10-11 | 2021-04-20 | 中国特种设备检测研究院 | Thermal efficiency correction method for deviation of inlet water temperature of gas condensation boiler from design value |
| CN113266833A (en) * | 2021-04-15 | 2021-08-17 | 华中科技大学 | Combustion optimization method, system and device of garbage incinerator |
| CN113932247A (en) * | 2021-11-24 | 2022-01-14 | 国家能源集团谏壁发电厂 | Automatic control method for reasonably reducing CO concentration of tower furnace |
| CN113932247B (en) * | 2021-11-24 | 2024-04-26 | 国家能源集团谏壁发电厂 | Automatic control method for reasonably reducing CO concentration of tower furnace |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: Shajiao C Power Station of Guangdong Yudean Group Co., Ltd. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee before: Shajiao C Power Station of Guangdong Yudean Group Co., Ltd. Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |