CN113883492B - Boiler steam temperature control method and electronic equipment - Google Patents
Boiler steam temperature control method and electronic equipment Download PDFInfo
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Abstract
The application discloses a boiler steam temperature control method and electronic equipment, comprising the following steps: obtaining the current highest wall temperature of a boiler steam heater in a temperature reduction section corresponding to a boiler desuperheater and the highest wall temperature of a target historical moment, wherein the target historical moment and the current moment are separated by a preset time length; determining the wall temperature change rate of the boiler steam heater according to the current highest wall temperature and the highest wall temperature of the target historical moment; according to the current highest wall temperature and the wall temperature change rate, adjusting a steam temperature set value of the boiler steam heater; and controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value. According to the scheme, the operation safety of the boiler unit can be improved.
Description
Technical Field
The application relates to the technical field of thermal power generating unit safety, in particular to a boiler steam temperature control method and electronic equipment.
Background
With the increase of the capacity of the national thermal power generating unit, the medium-sized and small-sized units are gradually replaced by the large-sized thermal power generating unit, however, the large-sized thermal power generating unit has a complex structure and the automatic control requirement on the large-sized thermal power generating unit is higher and higher due to the characteristics of various devices. At present, the requirements of large thermal power generating units at home and abroad on automatic control of related equipment and main parameters of a boiler are also higher and higher, and the automatic control of the steam temperature of the boiler steam is one of the main parameters of the automatic control of the boiler. The existing automatic regulation and control of the steam temperature of the boiler mainly uses a third party control system compatible with respective DCS systems to automatically control relevant parameters such as the steam temperature of a unit. The control mode is usually based on a complex control model, and the change rule of the controlled parameter is calculated through the reading and analysis of a large number of related parameters so as to correspondingly control the controlled parameter, thereby controlling the steam temperature of the boiler.
However, the safety of the boiler is not only related to the steam temperature, but also the overtemperature problem of the boiler can be caused by the mode of monitoring the steam temperature of the boiler and performing corresponding control, so that corresponding hidden danger is brought to the safe operation of the unit. How to effectively control the steam temperature of the boiler so as to improve the operation safety of the boiler is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the application aims to provide a boiler steam temperature control method and electronic equipment, which are used for solving the problem of low operation safety of a boiler.
In order to solve the technical problems, the present specification is implemented as follows:
in a first aspect, a method for controlling steam temperature of boiler is provided, comprising: obtaining the current highest wall temperature of a boiler steam heater in a temperature reduction section corresponding to a boiler desuperheater and the highest wall temperature of a target historical moment, wherein the target historical moment and the current moment are separated by a preset time length; determining the wall temperature change rate of the boiler steam heater according to the current highest wall temperature and the highest wall temperature of the target historical moment; according to the current highest wall temperature and the wall temperature change rate, adjusting a steam temperature set value of the boiler steam heater; and controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value.
Optionally, adjusting the steam temperature set point of the boiler steam heater according to the current highest wall temperature and the wall temperature change rate includes:
performing differential calculation on a wall temperature deviation value between the current highest wall temperature and the highest wall temperature of the target historical moment to obtain a differential value representing the wall temperature change rate;
summing the current highest wall temperature and the differential value to obtain a first wall temperature value;
respectively inputting the first wall temperature value into a first fold line function and a second fold line function to output a return difference correction value corresponding to the first wall temperature value, wherein the first fold line function and the second fold line function are respectively set to output corresponding correction values according to different wall temperature value intervals, the first fold line function and the second fold line function form a return difference function, and the return difference function returns the correction value output by the first fold line function according to the first wall temperature value and the return difference correction value output by the second fold line function according to the correction value output by the first wall temperature value;
and adjusting the steam temperature set value of the boiler steam heater according to the return difference correction value.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
acquiring the current output steam temperature of the boiler steam heater;
performing internal mold control on the adjusted steam temperature set value according to the deviation of the adjusted steam temperature set value and the current output steam temperature of the boiler steam heater so as to obtain an internal mold control correction value;
and controlling the actual output steam temperature of the boiler steam heater according to the internal mold correction value.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
sequentially acquiring temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially acquired temperature values of each point are gradually increased;
predicting the output steam temperature of the boiler steam heater according to the obtained temperature value of each point;
according to the predicted output steam temperature of the boiler steam heater, performing phase compensation on the adjusted steam temperature set value;
and controlling the actual output steam temperature of the boiler steam heater according to the compensated steam temperature set value.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
sequentially acquiring temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially acquired temperature values of each point are gradually increased;
according to the current temperature values of the points and the corresponding set correction values, respectively adjusting the current temperature values of the points to obtain corresponding adjusted temperature values of the points;
accumulating the respective corresponding adjustment temperature values of each point to obtain a total adjustment temperature value;
and controlling the actual output steam temperature of the boiler steam heater according to the total adjustment temperature value, the set temperature adjustment value and the current output steam temperature of the boiler steam heater.
Optionally, sequentially obtaining temperature values of points on a corresponding heating flow between a steam input end and a steam output end of the boiler steam heater in the temperature reducing section, including:
determining a state observation value of a target point of the heating process, wherein the state observation value is determined according to a temperature change time constant and a heating intensity coefficient corresponding to the target point;
and estimating the temperature value of the target point according to the state observation value.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
determining the current load change rate according to the current actual load of the unit where the boiler is located and the actual load at the target historical moment;
and adjusting the adjusted steam temperature set value according to the load change rate so as to control the steam temperature actually output by the boiler steam heater.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
determining the steam temperature deviation and the steam temperature change rate of the boiler steam heater according to the current actual output steam temperature of the boiler steam heater and the actual output steam temperature of the target historical moment;
determining the acquired feedforward control correction value corresponding to the steam temperature deviation and the steam temperature change rate of the boiler steam heater according to a preset fuzzy feedforward control rule table;
and adjusting the adjusted steam temperature set value according to the feedforward control correction value so as to control the steam temperature actually output by the boiler steam heater.
Optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value includes:
and adjusting at least one of a burner swing angle, a flue gas baffle and a water spraying valve opening of the boiler desuperheater corresponding to the boiler steam heater according to the adjusted steam temperature set value so as to control the steam temperature actually output by the boiler steam heater.
In a second aspect, there is provided an electronic device comprising a memory and a processor electrically connected to the memory, the memory storing a computer program executable by the processor to perform the steps of the method according to the first aspect.
In the embodiment of the application, the current highest wall temperature of the boiler steam heater in the temperature reduction section corresponding to the boiler attemperator and the highest wall temperature of the target historical moment are obtained, the wall temperature change rate of the boiler steam heater is determined according to the current highest wall temperature and the highest wall temperature of the target historical moment, the steam temperature set value of the boiler steam heater is adjusted according to the current highest wall temperature and the wall temperature change rate, and the steam temperature actually output by the boiler steam heater is controlled according to the adjusted steam temperature set value, so that the automatic control of the boiler wall temperature can be considered under the original conventional steam temperature control mode, the requirement of automatic regulation of the steam temperature of a unit can be met, the monitoring pressure of an operator is reduced, the quality of the steam temperature control of the boiler is improved, and the safety and the economical efficiency of the boiler unit are facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic flow chart of a boiler steam temperature control method according to an embodiment of the present application.
FIG. 2 is a schematic diagram of a wall temperature control flow of a boiler steam temperature control method according to an embodiment of the present application.
FIG. 3 is a block diagram of a wall temperature control flow in an embodiment of the present application.
Fig. 4 is a schematic diagram of an internal model control flow of the boiler steam temperature control method according to the embodiment of the present application.
Fig. 5 is a schematic diagram of a phase control flow of a boiler steam temperature control method according to an embodiment of the present application.
Fig. 6 is one of the state variable control flow charts of the boiler steam temperature control method according to the embodiment of the present application.
Fig. 7 is one of the state variable control flow charts of the boiler steam temperature control method according to the embodiment of the present application.
Fig. 8 is a block diagram of a state variable control flow according to an embodiment of the present application.
FIG. 9 is a schematic diagram of a unit load feedforward control flow of a boiler steam temperature control method according to an embodiment of the present application.
Fig. 10 is a schematic diagram of a fuzzy feedforward control flow of a boiler steam temperature control method according to an embodiment of the present application.
FIG. 11 is a block schematic diagram of an overall flow of a method for controlling steam temperature of boiler according to an embodiment of the present application.
Fig. 12 is a block diagram of the structure of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. The reference numerals in the present application are only used to distinguish the steps in the scheme, and are not used to limit the execution sequence of the steps, and the specific execution sequence controls the description in the specification.
In order to solve the problems in the prior art, an embodiment of the present application provides a method for controlling steam temperature of boiler, as shown in fig. 1, including the following steps:
102, acquiring the current highest wall temperature of a boiler steam heater in a temperature reduction section corresponding to a boiler desuperheater and the highest wall temperature of a target historical moment, wherein the target historical moment and the current moment are separated by a preset time length;
104, determining the wall temperature change rate of the boiler steam heater according to the current highest wall temperature and the highest wall temperature of the target historical moment;
step 106, according to the current highest wall temperature and the wall temperature change rate, adjusting a steam temperature set value of the boiler steam heater;
and step 108, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value.
In the embodiment of the application, in the case that the boiler unit system comprises a primary desuperheater and a secondary desuperheater, the primary desuperheater only affects the outlet temperature of the temperature reduction zone corresponding to the primary desuperheater, and likewise, the secondary desuperheater affects the outlet temperature of the temperature reduction zone corresponding to the secondary desuperheater. The boiler steam heaters include reheaters and superheaters, and one or more corresponding boiler steam heaters may be included in corresponding desuperheater sections in the boiler train system.
In step 102, firstly, all the easy-to-overheat boiler wall temperature measuring points of the reheater or the superheater in each temperature reduction section are listed by means of early data analysis and by combining the operation characteristics of the system, so as to obtain a plurality of wall temperature values, and then the current highest wall temperature in the section is selected through data quality judgment and logic maximization operation, so that easy-to-overheat wall temperature data are obtained.
In step 104, the change condition of the highest wall temperature of the temperature reducing section needs to be obtained, and the change rate of the highest wall temperature is calculated by determining the preset time interval for collecting the highest wall temperature. The change rate is the difference between the highest wall temperature at the current moment and the highest wall temperature at the previous moment divided by the preset time length, the wall temperature change rate reflects the trend of the change of the highest wall temperature of the reheater or the superheater in the current time interval, if the wall temperature change rate (absolute value) is large, the temperature of the reheater or the superheater is rapidly increased or decreased, the outlet temperature of the subsequent reheater or the heater is influenced, and the steam output is carried out according to the preset temperature value to keep the outlet temperature, so that the temperature regulation is effectively carried out as required.
The reheaters or superheaters of the different desuperheating sections have corresponding temperature settings, and the wall temperature of each section has a direct effect on the temperature settings of the corresponding section. The outlet temperatures of the various sections, taken together, have an effect on the final actual outlet temperature of the boiler steam.
Based on the solution provided in the foregoing embodiment, optionally, in step 106, as shown in fig. 2, the adjusting the steam temperature set value of the boiler steam heater according to the current highest wall temperature and the wall temperature change rate includes the following steps:
step 202, performing differential calculation on a wall temperature deviation value between the current highest wall temperature and the highest wall temperature of the target historical moment to obtain a differential value representing the wall temperature change rate;
step 204, summing the current highest wall temperature and the differential value to obtain a first wall temperature value;
step 206, inputting the first wall temperature value into a first fold line function and a second fold line function respectively to output a return difference correction value corresponding to the first wall temperature value, wherein the first fold line function and the second fold line function are respectively set to output corresponding correction values according to different wall temperature value intervals, the first fold line function and the second fold line function form a return difference function, and the return difference function returns the return difference of the correction value output by the first fold line function according to the first wall temperature value and the return difference of the correction value output by the second fold line function according to the first wall temperature value and then outputs the return difference correction value;
and step 208, adjusting the steam temperature set value of the boiler steam heater according to the return difference correction value.
Fig. 2 is a schematic diagram of a wall temperature control flow of a boiler steam temperature control method according to an embodiment of the present application, and in the following, the wall temperature control flow is described in conjunction with the embodiment of fig. 3, and fig. 3 is a schematic block diagram of the wall temperature control flow according to an embodiment of the present application.
As shown in fig. 3, the highest value of the wall temperature of the boiler steam heater in the corresponding section is obtained first, and then, for example, the LEAD/LAG function 12 is input to calculate the differential value corresponding to the wall temperature change rate. The differential is a rate of change reflecting the highest value of the wall temperature of the corresponding section, for example, 1 minute from 500 degrees to 520 degrees, and the differential value is a rate of change corresponding to a temperature deviation of 20 degrees. A large differential value indicates rapid temperature rise, and the subsequent boiler is more dangerous to over-temperature. By introducing the highest wall temperature change rate, the wall temperature overtemperature condition can be predicted in advance, and the action can be performed in advance.
The current highest wall temperature and the differential value output by the LEAD/LAG function 12 are respectively input to a summation function 14 for summation, and the summed temperature values are respectively input to a first folding line function f (x 1) and a second folding line function f (x 2).
As shown, the value output by the second folding line function f (x 2) is larger than the value output by the first folding line function f (x 1), and the value output by the first folding line function f (x 1) is smaller than the value output by the second folding line function f (x 2).
As one example, the f (x 1) function input and output correspondence is set as shown in table 1 below:
TABLE 1
| Point 1 | Point 2 | Point 3 | Point 4 | |
| x1 | 0 | 560 | 600 | 800 |
| y1 | 0 | 0 | 20 | 20 |
Wherein, x1 represents the input value of the f (x 1) function, i.e. the temperature value output by the summing function 14, and y represents the correction value of the temperature segment corresponding to the different temperature critical points set by the f (x 1) function. For example, in the above example, if the input x1 is between 0-560 degrees, the temperature deviation value y output by the first folding line function f (x 1) is 0; x1 is between 560 and 600, and the corresponding y is 20; x1 is between 600 and 800, with y corresponding to 20.
The temperature critical point corresponding to the second folding line function f (x 2) and the temperature correction value corresponding to the output are shown in the following table 2:
TABLE 2
| Point 1 | Point 2 | Point 3 | Point 4 | |
| x2 | 0 | 580 | 620 | 800 |
| y2 | 0 | 0 | 20 | 20 |
When the wall temperature rises, after the differential value corresponding to the highest wall temperature plus the rate change exceeds 580 ℃, the temperature set value starts to be corrected, and when the temperature set value reaches over 620 ℃, the corrected value is 20; when the wall temperature is reduced, the correction value starts to be reduced from 20 after the differential value corresponding to the highest wall temperature plus the rate change is lower than 600 ℃ and is reduced to 0 after the correction value reaches 560 ℃.
The value output by the second folding line function f (x 2) and the first folding line function f (x 1) form a return difference function, so that when the temperature reaches a set temperature critical point, the return difference exists in the temperature process of the output according to deviation control, the correction value can be prevented from repeatedly acting along with the change of the wall temperature after being introduced into the loop, the temperature can not be immediately switched back and forth, the outlet temperature is prevented from shaking, the stability of the output outlet temperature is improved, and the running safety of a unit is improved.
And finally, summing the return difference correction value with an outlet steam temperature set value of the corresponding section to realize the adjustment of the steam temperature set value according to the maximum value of the wall temperature in the section, thereby controlling the actual outlet temperature value of the steam temperature in the section.
In the actual running process of the unit, the wall temperature is also an important monitoring parameter, and when the wall temperature exceeds a standard value, the safety of the unit is affected, and the trip is seriously caused. The traditional combustion adjustment is not direct and slow, the temperature of the wall can be reduced rapidly to a certain extent, but the temperature of the wall is regulated to be steam temperature, and the wall temperature regulation function is not provided, so that the wall temperature is introduced into the steam temperature regulation in a specific mode.
According to the embodiment of the application, the automatic control of the wall temperature of the boiler is considered under the original conventional steam temperature control mode, the requirement of automatic regulation of the steam temperature of a unit can be met, the intervention times of operators can be reduced, the monitoring pressure of the operators is reduced, the quality of the steam temperature control of the boiler can be improved, and the steam temperature control method has great benefits on the service life of the boiler and the safety and economical efficiency of the unit operation.
In addition to adjusting the set value of the boiler steam heater by combining the wall temperature, the embodiment of the application also provides that the adjusted set value of the steam temperature is adjusted based on the internal mold control, as shown in fig. 4, so as to realize the control of the actual output boiler steam temperature of the outlet.
Fig. 4 is a schematic diagram of an internal model control flow of a boiler steam temperature control method according to an embodiment of the present application, as shown in fig. 4, for controlling an actual output steam temperature of the boiler steam heater according to an adjusted steam temperature set value, including the following steps:
step 302, obtaining the current output steam temperature of the boiler steam heater;
step 304, performing internal mold control on the adjusted steam temperature set value according to the deviation between the adjusted steam temperature set value and the current output steam temperature of the boiler steam heater, so as to obtain an internal mold control correction value;
and 306, controlling the actual output steam temperature of the boiler steam heater according to the internal mold correction value.
The internal model control is a novel control strategy for carrying out controller design based on a process mathematical model, and the controller design can be directly obtained by the process model.
In one embodiment, as shown in fig. 5, the embodiment of the application further proposes to adjust the adjusted steam temperature set value based on phase control, thereby realizing the control of the steam temperature of the boiler actually output by the outlet.
Fig. 5 is a schematic diagram of a phase control flow of a boiler steam temperature control method according to an embodiment of the present application, as shown in fig. 5, and according to an adjusted steam temperature set value, controlling an actual output steam temperature of the boiler steam heater, including the following steps:
step 402, sequentially obtaining temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially obtained temperature values of each point are gradually increased;
step 404, predicting the output steam temperature of the boiler steam heater according to the obtained temperature value of each point;
step 406, performing phase compensation on the adjusted steam temperature set value according to the predicted output steam temperature of the boiler steam heater;
and step 408, controlling the actual output steam temperature of the boiler steam heater according to the compensated steam temperature set value.
Specifically, according to the inlet temperature and part of intermediate temperature of a known heated area acquired in the section, temperature values of different points in the middle of the heated area are sequentially transmitted and estimated through a transfer function formula of multi-order inertia, so that the output steam temperature of the corresponding area of the boiler steam heater is estimated (i.e. predicted).
Since the output steam temperature of the boiler steam heater as a controlled object has large inertia and hysteresis, in order to ensure that the control system has sufficient stability margin, the temperature adjustment can only be set very slowly, and the slow adjustment effect cannot have good control effect on the large hysteresis object. Therefore, the embodiment of the application utilizes the phase compensation network of the advanced dynamic compensation to compensate the inertia and the hysteresis of the controlled object, so that the compensated equivalent object has the characteristic of smaller hysteresis, and the adjustment action speed can be accelerated on the premise of ensuring the stability of the control system, thereby effectively inhibiting the change of the steam temperature.
In one embodiment, as shown in fig. 6, the embodiment of the application further proposes to adjust the adjusted steam temperature set value based on the state variable control, thereby realizing the boiler steam temperature control actually output by the outlet.
Fig. 6 is a schematic diagram of a state variable control flow of a boiler steam temperature control method according to an embodiment of the present application, as shown in fig. 6, for controlling an actual output steam temperature of the boiler steam heater according to an adjusted steam temperature set value, including the following steps:
step 502, sequentially obtaining temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially obtained temperature values of each point are gradually increased;
step 504, according to the current temperature value of each point and the corresponding set correction value, respectively adjusting the current temperature value of each point to obtain the corresponding adjusted temperature value of each point;
step 506, accumulating the respective adjustment temperature values of each point to obtain a total adjustment temperature value;
and step 508, controlling the actual output steam temperature of the boiler steam heater according to the total adjustment temperature value, the set temperature adjustment value and the current output steam temperature of the boiler steam heater.
When the boiler load changes, the temperature at various points in the steam flow in the reheater or superheater always precedes the corresponding change in reheat or superheat steam temperature. In the embodiment of the application, the temperature of each point on the flow is regulated according to the flow, and once the temperature changes, the temperature immediately acts and is regulated in time, so that a good control effect can be obtained.
Because of the difficulty of adding temperature measurement points to a high-temperature boiler steam heater, the embodiment of the application provides that the temperature values, also called state variables, are estimated according to a dynamic mathematical model corresponding to the boiler steam heater. And then, temperature adjustment is performed according to the estimated temperature values.
Therefore, based on the solution provided in the foregoing embodiment, optionally, in the foregoing step 402 or step 502, as shown in fig. 7, the sequentially obtaining the temperature values of each point on the heating flow between the steam input end and the steam output end of the boiler steam heater in the temperature reducing section includes the following steps:
step 602, determining a state observation value of a target point of the heating process, wherein the state observation value is determined according to a temperature change time constant and a heating intensity coefficient corresponding to the target point;
step 604, estimating a temperature value of the target point according to the state observation value.
Next, description will be made with reference to an example of fig. 8, and fig. 8 is a schematic block diagram of a state variable control flow according to an embodiment of the present application.
In the example of FIG. 8, the temperature value θ for 5 points on the reheater flow is estimated 1 ～θ 5 The corresponding state observation mathematical model function is a transfer functionT si Indicating the time constant of the temperature change, then->k i Representing the coefficient of thermal intensity. Wherein each point is estimated with respect to a mathematical model function.
The temperature change time constant reflects the corresponding time when the temperature of one point of the heating process changes to the temperature value of the adjacent point, and the heating intensity coefficient reflects the heating quantity of heating equipment with different heating capacities, and has more heating and large heating intensity coefficient; conversely, the heating intensity coefficient is small. For example, by performing state variable observations through a data model, state observations of corresponding reheater process inlet and outlet temperatures corresponding to 5 points can be estimated to be 350 degrees, 400 degrees, 450 degrees, 480 degrees, and 500 degrees.
Thus, the adjustment temperature values of each point are accumulated to obtain a total adjustment temperature value K, and the total adjustment temperature value K is combined with the reheat steam temperature set value and the current output reheat steam temperature T of the reheater r The burner swing angle is controlled, so that the actual output steam temperature of the boiler steam heater is controlled.
In one embodiment, as shown in fig. 9, the embodiment of the application further proposes to adjust the adjusted steam temperature set value based on the unit load feedforward control, thereby realizing the boiler steam temperature control actually output by the outlet.
Fig. 9 is a schematic diagram of a unit load feedforward control flow of a boiler steam temperature control method according to an embodiment of the present application, and as shown in fig. 9, the unit load feedforward control flow controls the actual output steam temperature of the boiler steam heater according to an adjusted steam temperature set value, and includes the following steps:
step 702, determining a current load change rate according to the current actual load of a unit where the boiler is located and the actual load at a target historical moment;
and step 704, adjusting the adjusted steam temperature set value according to the load change rate so as to control the steam temperature actually output by the boiler steam heater.
In this embodiment, the current actual load of the unit is related to the received remote unit load command, which requires an ascending load, and then the current actual load of the unit will also rise and vice versa as the command requires. In the process of rising or falling of the actual load of the unit, a certain load change rate exists according to the change speed. The load change comprises a small-range change and a large-range change of the load, and the corresponding generated load change rate is used as a feedforward signal to adjust the steam temperature set value.
In one embodiment, as shown in fig. 10, the embodiment of the application further proposes to adjust the adjusted steam temperature set value based on the unit load feedforward control, thereby realizing the boiler steam temperature control actually output by the outlet.
Fig. 10 is a schematic diagram of a fuzzy feedforward control flow of a boiler steam temperature control method according to an embodiment of the present application, as shown in fig. 10, for controlling an actual output steam temperature of the boiler steam heater according to an adjusted steam temperature set value, including the following steps:
step 802, determining a steam temperature deviation and a steam temperature change rate of the boiler steam heater according to the current actual output steam temperature of the boiler steam heater and the actual output steam temperature of the target historical moment;
step 804, determining the obtained feedforward control correction value corresponding to the steam temperature deviation and the steam temperature change rate of the boiler steam heater according to a preset fuzzy feedforward control rule table;
and step 806, adjusting the adjusted steam temperature set value according to the feedforward control correction value to control the steam temperature actually output by the boiler steam heater.
In this embodiment, the steam temperature set point may be adjusted according to the steam temperature deviation and the deviation change rate of the steam heater. In the embodiment of the application, a fuzzy set theory is adopted, the steam temperature deviation delta et of the steam heater of the boiler is divided into a preset number of fuzzy subset mathematical models in a preset temperature interval, for example, seven fuzzy subset mathematical models { NB, NM, NS, ZO, PS, PM, PB } in [ -20 ℃,20 ℃ are respectively represented by { negative big, negative medium, negative small, zero, positive small, medium and positive big }; the boiler steam heater steam temperature deviation rate of change dΔet/dt is also divided into a corresponding number of fuzzy subsets over a predetermined time interval, e.g., into seven fuzzy subsets { NB, NM, NS, ZO, PS, PM, PB }, within [ -3 ℃/min, +3 ℃/min ]. Correspondingly, the adjustment range of the fuzzy feedforward amount is, for example, [ -15%, +15% ] is also divided into seven fuzzy subsets.
It should be noted that the partitioning of the fuzzy subsets should not be equally spaced based on the field operating conditions and associated operating experience. After the fuzzy subset is divided, the following fuzzy feedforward control rule table can be adopted:
and according to the corresponding relation between the steam temperature deviation delta et of the boiler steam heater and the steam temperature deviation change rate d delta et/dt of the national boiler steam heater and each fuzzy subset in the fuzzy feedforward control rule table, determining the feedforward quantity of the corresponding fuzzy subset for fuzzy feedforward control.
Because the heating steam temperature of the boiler is greatly influenced by start-stop grinding, a fuzzy control rule table is set according to the start-stop grinding group, the output carried by the grinding group and the different influences of the grinding group on the steam temperature, the start-stop feedforward action of the refined grinding group is determined, disturbance is eliminated in advance, the great disturbance of the start-stop grinding on the heating steam temperature of the boiler is avoided, and the disturbance resistance of the steam temperature control on the start-stop grinding is improved.
In one embodiment, optionally, controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set point includes: and adjusting at least one of a burner swing angle, a flue gas baffle and a water spraying valve opening of the boiler desuperheater corresponding to the boiler steam heater according to the adjusted steam temperature set value so as to control the steam temperature actually output by the boiler steam heater.
Fig. 11 shows an overall flow of the embodiment of the present application with various control cases shown in fig. 1 to 10, and as shown in the drawing, by adjusting the burner tilt angle, the flue gas baffle and/or the water spray valve opening of the boiler attemperator, the wall temperature control, the phase compensation and the state variable control are implemented to adjust the steam temperature set value at the steam temperature input end, the internal mold control adjusts the output of the steam temperature set value, the unit load feedforward control 1 corresponding to the change of the load in a small range and the unit load feedforward control 2 corresponding to the change of the load, and the fuzzy control feedforward based on the steam temperature deviation and the deviation change rate of the boiler steam heater output based on the steam temperature set value, and also respectively output the steam temperature PID control corresponding to the steam temperature after adjusting the burner tilt angle, the flue gas baffle and/or the water spray valve opening of the boiler attemperator, thereby implementing the actual output steam temperature control of the outlet.
The boiler steam temperature control of the embodiment of the application is beneficial to the pre-control of the large-inertia steam temperature regulating loop so as to achieve a stable steam temperature control effect in dynamic control.
Optionally, the embodiment of the present application further provides an electronic device, and fig. 12 is a block diagram of the structure of the electronic device in the embodiment of the present application.
As shown in the drawing, the electronic device 2000 includes a memory 2200 and a processor 2400 electrically connected to the memory 2200, where the memory 2200 stores a computer program that can be executed by the processor 2400, where the computer program implements each process of any one of the foregoing boiler steam temperature control method embodiments when executed by the processor, and the process achieves the same technical effects, and for avoiding repetition, a description is omitted herein.
The embodiment of the application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements each process of any one of the above embodiments of the boiler steam temperature control method, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), including several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (9)
1. A method for controlling steam temperature of boiler steam, comprising:
obtaining the current highest wall temperature of a boiler steam heater in a temperature reduction section corresponding to a boiler desuperheater and the highest wall temperature of a target historical moment, wherein the target historical moment and the current moment are separated by a preset time length;
determining the wall temperature change rate of the boiler steam heater according to the current highest wall temperature and the highest wall temperature of the target historical moment;
according to the current highest wall temperature and the wall temperature change rate, adjusting a steam temperature set value of the boiler steam heater;
controlling the actual output steam temperature of the boiler steam heater according to the adjusted steam temperature set value;
adjusting a steam temperature set point of the boiler steam heater according to the current highest wall temperature and the wall temperature change rate, wherein the steam temperature set point comprises:
performing differential calculation on a wall temperature deviation value between the current highest wall temperature and the highest wall temperature of the target historical moment to obtain a differential value representing the wall temperature change rate;
summing the current highest wall temperature and the differential value to obtain a first wall temperature value;
respectively inputting the first wall temperature value into a first fold line function and a second fold line function to output a return difference correction value corresponding to the first wall temperature value, wherein the first fold line function and the second fold line function are respectively set to output corresponding correction values according to different wall temperature value intervals, the first fold line function and the second fold line function form a return difference function, and the return difference function returns the correction value output by the first fold line function according to the first wall temperature value and the return difference correction value output by the second fold line function according to the correction value output by the first wall temperature value;
and adjusting the steam temperature set value of the boiler steam heater according to the return difference correction value.
2. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
acquiring the current output steam temperature of the boiler steam heater;
performing internal mold control on the adjusted steam temperature set value according to the deviation of the adjusted steam temperature set value and the current output steam temperature of the boiler steam heater so as to obtain an internal mold control correction value;
and controlling the actual output steam temperature of the boiler steam heater according to the internal mold correction value.
3. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
sequentially acquiring temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially acquired temperature values of each point are gradually increased;
predicting the output steam temperature of the boiler steam heater according to the obtained temperature value of each point;
according to the predicted output steam temperature of the boiler steam heater, performing phase compensation on the adjusted steam temperature set value;
and controlling the actual output steam temperature of the boiler steam heater according to the compensated steam temperature set value.
4. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
sequentially acquiring temperature values of each point on a corresponding heating flow between a steam input end and a steam output end of a boiler steam heater in the temperature reducing section, wherein the sequentially acquired temperature values of each point are gradually increased;
according to the current temperature values of the points and the corresponding set correction values, respectively adjusting the current temperature values of the points to obtain corresponding adjusted temperature values of the points;
accumulating the respective corresponding adjustment temperature values of each point to obtain a total adjustment temperature value;
and controlling the actual output steam temperature of the boiler steam heater according to the total adjustment temperature value, the set temperature adjustment value and the current output steam temperature of the boiler steam heater.
5. The method according to claim 3 or 4, wherein sequentially obtaining the temperature values of points on the heating flow between the steam input end and the steam output end of the boiler steam heater in the temperature reducing section comprises:
determining a state observation value of a target point of the heating process, wherein the state observation value is determined according to a temperature change time constant and a heating intensity coefficient corresponding to the target point;
and estimating the temperature value of the target point according to the state observation value.
6. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
determining the current load change rate according to the current actual load of the unit where the boiler is located and the actual load at the target historical moment;
and adjusting the adjusted steam temperature set value according to the load change rate so as to control the steam temperature actually output by the boiler steam heater.
7. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
determining the steam temperature deviation and the steam temperature change rate of the boiler steam heater according to the current actual output steam temperature of the boiler steam heater and the actual output steam temperature of the target historical moment;
determining the acquired feedforward control correction value corresponding to the steam temperature deviation and the steam temperature change rate of the boiler steam heater according to a preset fuzzy feedforward control rule table;
and adjusting the adjusted steam temperature set value according to the feedforward control correction value so as to control the steam temperature actually output by the boiler steam heater.
8. The method of claim 1, wherein controlling the actual output steam temperature of the boiler steam heater based on the adjusted steam temperature setpoint comprises:
and adjusting at least one of a burner swing angle, a flue gas baffle and a water spraying valve opening of the boiler desuperheater corresponding to the boiler steam heater according to the adjusted steam temperature set value so as to control the steam temperature actually output by the boiler steam heater.
9. An electronic device, comprising: a memory and a processor electrically connected to the memory, the memory storing a computer program executable by the processor, the computer program implementing the steps of the method of any one of claims 1 to 8 when executed by the processor.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51148101A (en) * | 1975-06-14 | 1976-12-20 | Toshiba Corp | Control device for steam temperature |
| JPH0320501A (en) * | 1989-06-19 | 1991-01-29 | Hokkaido Electric Power Co Inc:The | Steam temperature control of boiler |
| JPH0688605A (en) * | 1992-09-09 | 1994-03-29 | Babcock Hitachi Kk | Controlling device for temperature of steam in boiler |
| CN103528041A (en) * | 2013-11-06 | 2014-01-22 | 江苏大唐国际吕四港发电有限责任公司 | Super (super) critical boiler high temperature heating surface pipe wall temperature measuring point optimizing method |
| CN106949457A (en) * | 2017-05-10 | 2017-07-14 | 西安西热控制技术有限公司 | A kind of super critical boiler pendant superheater overtemperture control system and method |
| CN107218594A (en) * | 2017-06-16 | 2017-09-29 | 重庆大学 | Boiler Steam Temperature many reference amounts intelligence control system |
| CN108386829A (en) * | 2018-03-01 | 2018-08-10 | 北京德普新源科技发展有限公司 | A kind of temprature control method of boiler overheating steam, device and system |
| CN109028025A (en) * | 2018-07-30 | 2018-12-18 | 吉林省电力科学研究院有限公司 | A method of inhibit super critical boiler main steam temperature excessively high |
| CN112097232A (en) * | 2020-10-15 | 2020-12-18 | 西安热工研究院有限公司 | Coal-fired unit water-cooled wall overtemperature control system and method based on wall temperature prediction |
-
2021
- 2021-09-06 CN CN202111040193.XA patent/CN113883492B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51148101A (en) * | 1975-06-14 | 1976-12-20 | Toshiba Corp | Control device for steam temperature |
| JPH0320501A (en) * | 1989-06-19 | 1991-01-29 | Hokkaido Electric Power Co Inc:The | Steam temperature control of boiler |
| JPH0688605A (en) * | 1992-09-09 | 1994-03-29 | Babcock Hitachi Kk | Controlling device for temperature of steam in boiler |
| CN103528041A (en) * | 2013-11-06 | 2014-01-22 | 江苏大唐国际吕四港发电有限责任公司 | Super (super) critical boiler high temperature heating surface pipe wall temperature measuring point optimizing method |
| CN106949457A (en) * | 2017-05-10 | 2017-07-14 | 西安西热控制技术有限公司 | A kind of super critical boiler pendant superheater overtemperture control system and method |
| CN107218594A (en) * | 2017-06-16 | 2017-09-29 | 重庆大学 | Boiler Steam Temperature many reference amounts intelligence control system |
| CN108386829A (en) * | 2018-03-01 | 2018-08-10 | 北京德普新源科技发展有限公司 | A kind of temprature control method of boiler overheating steam, device and system |
| CN109028025A (en) * | 2018-07-30 | 2018-12-18 | 吉林省电力科学研究院有限公司 | A method of inhibit super critical boiler main steam temperature excessively high |
| CN112097232A (en) * | 2020-10-15 | 2020-12-18 | 西安热工研究院有限公司 | Coal-fired unit water-cooled wall overtemperature control system and method based on wall temperature prediction |
Non-Patent Citations (3)
| Title |
|---|
| 一台660MW单元机组主蒸汽温度控制系统的设计与调试;刘敏;张智;吴飞君;朱明成;;现代电力(第02期);全文 * |
| 优化壁温计算模型及其在电站锅炉壁温在线监测中的应用;陈朝松;张树林;刘平元;胡兴胜;丁士发;;动力工程(第09期);全文 * |
| 大型火电机组主蒸汽温度控制系统应用研究;姜新明;郑伟;邵毅;王海波;范廷举;;东北电力技术(第03期);全文 * |
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