CN110318824B - Backpressure correction function setting method and system related to steam turbine valve management - Google Patents
Backpressure correction function setting method and system related to steam turbine valve management Download PDFInfo
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- CN110318824B CN110318824B CN201910605260.4A CN201910605260A CN110318824B CN 110318824 B CN110318824 B CN 110318824B CN 201910605260 A CN201910605260 A CN 201910605260A CN 110318824 B CN110318824 B CN 110318824B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
The utility model provides a backpressure correction function setting method and a system relating to the management of a steam turbine valve, which comprises the following steps: controlling a high regulating valve of the steam turbine unit to be fully opened, and raising the pressure of the steam turbine unit to a rated main steam pressure value; putting the steam turbine unit into a boiler following mode, controlling the pressure of the steam turbine unit at a rated main steam pressure value, and automatically controlling the main steam pressure in a closed loop mode by a main controller of the boiler; reducing the main control instruction of the steam turbine unit, and reducing the load of the steam turbine unit to a set ratio; collecting characteristic data of parameters of pressure and main steam pressure of a regulating stage; calculating main steam flow data based on the collected regulating stage pressure and main steam pressure parameter characteristic data, and obtaining main steam flow percentage; and taking the critical pressure ratio as a reference segmentation point, and segmenting to calculate corresponding nozzle area flow data. The method and the device set the backpressure correction function of the steam turbine valve management, improve the reliability of the steam turbine valve flow management control, improve the primary frequency modulation and load control quality, and meet the control requirements of the power grid.
Description
Technical Field
The disclosure relates to the technical field of steam turbines, in particular to a backpressure correction function setting method and system relating to steam turbine valve management.
Background
The backpressure correction in the steam turbine valve management control is the most important control link in a valve flow control scheme, the backpressure correction function in the valve management control is the correction of a load flow instruction, a load flow value is corrected into a corresponding nozzle area flow value, and the correction value is determined by the size characteristic of the nozzle flow area of the steam turbine valve. Usually, a set value of a backpressure correction function is given by a steam turbine plant, but along with long-term operation of a steam turbine and transformation of a through-flow part, the original backpressure correction function cannot be accurately matched with the size characteristic of the through-flow area of a nozzle, and the load control quality of the steam turbine can be directly influenced by the misalignment of the backpressure correction function, so that faults such as frequent shaking of a steam turbine valve or poor response capability of primary frequency modulation are caused.
In the existing turbine valve flow characteristic setting work, a precise online setting method is lacked for a backpressure correction function, the backpressure correction function provided by a host factory is generally continuously used, the size characteristic of the flow area of a turbine valve nozzle cannot be truly reflected, the restriction is brought to the valve flow characteristic setting work, and the valve flow characteristic setting effect and the turbine control quality are influenced.
Disclosure of Invention
The purpose of the embodiments of the present specification is to provide a backpressure correction function setting method related to turbine valve management, which can conveniently and effectively set a backpressure correction function conforming to the characteristics of a turbine valve nozzle on line, and improve the primary frequency modulation and load control quality of a unit.
The embodiment of the specification provides a backpressure correction function setting method relating to steam turbine valve management, which is realized by the following technical scheme:
the method comprises the following steps:
controlling a high regulating valve of the steam turbine unit to be fully opened, and raising the pressure of the steam turbine unit to a rated main steam pressure value;
putting the steam turbine unit into a boiler following mode, controlling the pressure of the steam turbine unit at a rated main steam pressure value, and automatically controlling the main steam pressure in a closed loop mode by a main controller of the boiler;
reducing the main control instruction of the steam turbine unit, and reducing the load of the steam turbine unit to a set ratio;
collecting characteristic data of parameters of pressure and main steam pressure of a regulating stage;
calculating main steam flow data based on the collected regulating stage pressure and main steam pressure parameter characteristic data, and obtaining main steam flow percentage;
and taking the critical pressure ratio as a reference segmentation point, and segmenting to calculate corresponding nozzle area flow data.
According to the further technical scheme, when the high-pressure regulating valve of the steam turbine unit is controlled to be fully opened and the pressure of the steam turbine unit is increased to a rated main steam pressure value, the primary frequency modulation function of the steam turbine unit is cut off.
According to the further technical scheme, when the main control instruction of the steam turbine unit is reduced, the main control load reduction rate of the steam turbine unit is set, and the load of the unit is reduced at the rate.
According to the further technical scheme, the step of collecting characteristic data of parameters of the pressure of the regulating stage and the main steam pressure comprises the following steps:
based on the history curve, the pressure of the regulating stage and the main steam pressure are collected when the regulating valve is fully opened, and
each valve point corresponds to the regulating stage pressure and the main steam pressure.
According to the further technical scheme, the ratio of the regulating stage pressure to the main steam pressure of each valve point accounts for the percentage of the ratio of the regulating stage pressure to the main steam pressure when the regulating valve is fully opened, the percentage of the main steam flow is obtained, and then the main steam flow is obtained.
According to the further technical scheme, the critical pressure ratio is taken as a reference segmentation point, and corresponding nozzle area flow data are calculated in a segmentation mode:
when the ratio of the adjusting stage pressure to the main steam pressure is smaller than the critical pressure ratio, the nozzle area flow is equal to the main steam flow;
when the ratio of the adjusting stage pressure to the main steam pressure is larger than or equal to the critical pressure ratio, the ratio of the adjusting stage pressure to the main steam pressure is subtracted after being corrected by a correction function, the subtracted value is multiplied by 5 times of gain through squaring to serve as a correction coefficient, and the main steam flow is divided by the correction coefficient to obtain the nozzle area flow.
In a further technical solution, the correction function:
f(x)＝x1.626；
g(x)＝x1.813。
according to the further technical scheme, a backpressure correction function of the nozzle area flow corresponding to the main steam flow is obtained based on the corresponding relation between the main steam flow and the nozzle area flow.
The embodiment of the specification provides a backpressure correction function setting system relating to steam turbine valve management, which is realized by the following technical scheme:
the method comprises the following steps: the device comprises a first division arithmetic unit, a second division arithmetic unit, a third division arithmetic unit, a fourth division arithmetic unit, a first multiplication arithmetic unit, a second multiplication arithmetic unit, a subtraction arithmetic unit, an evolution arithmetic unit, a small selection comparator and a switcher;
the first division arithmetic unit takes the ratio of the pressure of the adjusting stage to the pressure of the main steam as a first ratio and transmits the first ratio to a third division arithmetic unit;
the second division arithmetic unit takes the ratio of the regulating stage pressure of the regulating valve full-opening working condition and the main steam pressure of the regulating valve full-opening working condition as a second ratio and transmits the second ratio to a third division arithmetic unit;
the third division arithmetic unit multiplies the first ratio and the second ratio by 100 through the first multiplication arithmetic unit to be used as the main steam flow; the output end of the first multiplication arithmetic unit is also connected with the Y end of the switcher;
when the ratio of the regulating stage pressure to the main steam pressure is greater than or equal to the critical pressure ratio, the subtraction arithmetic unit respectively subtracts the regulating stage pressure and the main steam pressure ratio after correction of a correction function;
the squaring arithmetic unit squars the result of the subtraction arithmetic unit and outputs the result to a second multiplication arithmetic unit;
and the second multiplication operator multiplies the result after the division by 5 to obtain a correction coefficient and outputs the correction coefficient to a fourth division operator, the input end of the fourth division operator is also connected with the output end of the first multiplier, and the output end of the fourth division operator is connected to the N end of the switcher.
Embodiments of the present specification provide a data processing apparatus configured to include the above-described backpressure modification function setting system relating to turbine valve management.
Compared with the prior art, the beneficial effect of this disclosure is:
the method is an effective method for obtaining the backpressure correction function of the steam turbine valve management, is simple and convenient in operation and setting process, and is easy to popularize and implement; the backpressure correction function of the turbine valve management is set, the size characteristic of the flow area of the nozzle of the turbine valve can be accurately reflected, the reliability of the flow management control of the turbine valve is improved, the primary frequency modulation and the load control quality are improved, and the control requirement of a power grid is met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a flow chart of an implementation of a turbine backpressure correction function setting scheme;
FIG. 2 is a logic diagram of a turbine backpressure correction function setting calculation model;
wherein: 1 is a division arithmetic unit; 2 is a multiplication arithmetic unit; 3 is a subtraction arithmetic unit; 4 is an squaring arithmetic unit; and 5 is a small selection comparator.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example of implementation 1
The embodiment discloses a backpressure correction function setting method relating to steam turbine valve management, and is an effective method for obtaining an accurate backpressure correction function through an online setting data test and calculating according to a setting model.
The core idea is as follows: setting data parameters are obtained through a unit low-speed online load reduction test, main steam flow data are calculated according to a setting model, a critical pressure ratio of 0.559 is taken as a reference sectional data point, the main steam flow data are replaced by the setting calculation model, sectional calculation is carried out on the corresponding nozzle area flow data after backpressure correction, and a backpressure correction function of the nozzle area flow corresponding to the main steam flow is obtained according to the calculated value.
Referring to fig. 1, a specific embodiment includes the following steps:
step one, a main controller of a turbine of a unit is increased to 100%, and the pressure of the unit is increased to a rated main steam pressure value;
specifically, the method comprises the following steps: the method comprises the following steps:
a. the main control switch of the steam turbine is manually operated and is lifted to 100 percent, and the high regulating valve of the steam turbine is fully opened. The setting does not involve a high-pressure main valve, the high-pressure main valve is always in a fully open state, and the high-pressure regulating valve is positioned behind the high-pressure main valve.
b. The combustion rate of the boiler is improved, and the pressure of the unit is increased to the rated main steam pressure.
c. And the primary frequency modulation function of the cutting machine set.
And the primary frequency modulation function is removed to prevent the frequency change in the test from influencing the command opening of the high-pressure valve.
Wherein, when the main control of the steam turbine is increased to 100%, the high regulating valve of the steam turbine is fully opened; and adjusting a boiler combustion system to enable the unit to rise to the rated main steam pressure.
Step two, putting into a boiler following mode, and controlling the pressure of the unit at the rated main steam pressure;
and (3) putting the boiler into a boiler following mode (BF), and controlling the pressure of the unit at the rated main steam pressure through the automatic closed-loop control of the main control of the boiler.
Step three, reducing the steam turbine main control instruction at a low rate, and reducing the load of the unit to 45%;
setting the load reduction rate of the main control of the steam turbine to be 0.3%/min, and starting to reduce the load of the unit;
the actual load of the standby group is reduced to 45%, and the load reduction of the main control of the steam turbine is suspended.
Collecting characteristic data of parameters of the pressure of the adjusting stage and the main steam pressure;
collecting regulation stage pressure and main steam pressure parameters from data trends in a DCS system, comprising:
a. acquiring the pressure of a regulating stage of the steam turbine and the main steam pressure of a unit when a regulating valve is fully opened from a DCS historical curve;
b. and acquiring the pressure of each valve point corresponding to the regulating stage and the main steam pressure from the DCS historical curve.
The data collection can be found through the same historical curve in the test process.
Substituting the acquired parameters into a setting calculation model to calculate main steam flow data;
and (4) calculating the ratio of the regulating stage pressure to the main steam pressure of each valve point in the ratio of the regulating stage pressure to the main steam pressure when the regulating valve is fully opened to obtain the main steam flow percentage.
Step six, taking the critical pressure ratio of 0.559 as a reference segmentation point, and calculating corresponding nozzle area flow data in a segmentation manner;
when the ratio of the pressure of the adjusting stage to the main steam pressure is less than 0.559, the area flow of the nozzle passes through a switcher (figure 2), the Y end is selected, and the area flow of the nozzle is equal to the main steam flow; when the ratio of the adjusting stage pressure to the main steam pressure is greater than or equal to 0.559, the nozzle area flow passes through a switcher (figure 2), an end N is selected, the ratio of the adjusting stage pressure to the main steam pressure is subtracted after f (x) and g (x) are corrected, the subtracted result is multiplied by 5 times of gain through an evolution, the obtained product is used as a correction coefficient, and the main steam flow is divided by the correction coefficient to obtain the nozzle area flow.
The relational expression of f (x),f(x)＝x1.626(ii) a The relation of g (x), g (x) x1.813And x is the ratio of the regulated stage pressure to the main steam pressure.
And seventhly, screening effective data to obtain a backpressure correction function of the nozzle area flow corresponding to the main steam flow.
When effective data is screened, a smooth curve trend is drawn through the data points, and deviation curve data points are removed
The backpressure correction function is not suitable for expression of function expressions due to the nonlinearity of the correction function, and is usually expressed in a multi-stage function mode of characteristic point X-Y corresponding relation.
And screening the calculated data based on the application data trend graph software to obtain the corresponding function relation.
The backpressure correction function setting method related to the steam turbine valve management has the following advantages:
the invention combines the existing control scheme of the unit, has simple and convenient operation and setting process, small risk coefficient, few restriction factors, low cost and easy popularization.
The setting calculation model adopted by the invention can accurately reflect the size characteristic of the flow area of the nozzle of the steam turbine valve, and the reliability of the flow management control of the steam turbine valve is improved.
The backpressure correction function of the turbine valve management is set, so that the primary frequency modulation and load control quality of the unit is greatly improved, and the control requirement of a power grid is met.
The technical scheme and the beneficial effects of the invention are described in the following by combining engineering examples.
A certain N330-16.7/537/537 unit develops the optimization of the backpressure function of the valve management of the steam turbine, and the implementation is carried out according to the implementation technical scheme of the invention, and the implementation process is as follows:
firstly, the main control of the steam turbine of the unit is increased to 100 percent, and the high-speed governing doors GV1, GV2, GV3 and GV4 are opened to 100 percent; the pressure of the unit is increased to the rated main steam pressure value of 16.7MPa, and the primary frequency modulation function of the unit is cut off.
And secondly, putting the boiler into a boiler following mode (BF), controlling the pressure of the unit to be 16.7MPa of rated main steam pressure, and automatically controlling the main steam pressure in a closed loop mode by the main control of the boiler.
And thirdly, reducing the steam turbine master control command at the rate of 0.3%/min, closing valves of the unit regulating valve according to GV2, GV1, GV3 and GV4 in sequence, reducing the load of the unit to 150MW, ending load reduction, recovering the normal load of the unit, and putting the unit into a primary frequency modulation function.
And fourthly, acquiring characteristic data of the main steam pressure and the main steam pressure from the DCS historical data, wherein the characteristic data of the main steam pressure and the main steam pressure are shown in the table 1.
TABLE 1 setting test acquisition parameters and calculation data
Wherein the pressure of the adjusting stage is 13.20MPa and the main steam pressure is 16.7MPa when the adjusting door is fully opened.
Substituting the acquired parameters into a setting calculation model (shown in figure 2) to calculate the main steam flow data, wherein the calculation result is shown in the main steam flow data in the table 1.
Sixthly, working condition points with the critical pressure ratio smaller than 0.559 are obtained from the collected data, as can be seen from table 1, when the working condition points with the regulating stage pressure of 9.32MPa and the main steam pressure of 16.7MPa exist, the critical pressure ratio is 0.558, the regulating stage pressure is continuously reduced along with the closing of the high-pressure regulating valve, the actual critical pressure ratio is continuously reduced, and the critical pressure ratio is smaller than 0.558. During calculation, the working condition point and the reference subsection point with the critical pressure ratio of less than 0.559 are used as the regulating stage pressure of 9.32MPa and the main steam pressure of 16.7MPa, the regulating stage pressure and the main steam pressure are substituted into a setting calculation model (shown in figure 2) to calculate the area flow of the nozzle in a subsection mode, and the calculation result is shown in the area flow data of the nozzle in the table 1.
And seventhly, screening characteristic quantities (simplifying and effectively representing a backpressure function correction relation) according to the X-Y relation corresponding to the main steam flow and the nozzle area flow through an EXCEL trend graph to obtain a backpressure correction function in the table 2.
TABLE 2 backpressure modification function
By adopting the technical scheme of the invention, the backpressure correction function of the turbine valve management is set, the size characteristic of the flow area of the nozzle of the turbine valve can be accurately reflected, the reliability of the flow management control of the turbine valve is increased, and the primary frequency modulation and load control quality is greatly improved.
Example II
The embodiment of the specification provides a backpressure correction function setting system relating to steam turbine valve management, which is realized by the following technical scheme:
the method comprises the following steps: the device comprises a first division arithmetic unit, a second division arithmetic unit, a third division arithmetic unit, a fourth division arithmetic unit, a first multiplication arithmetic unit, a second multiplication arithmetic unit, a subtraction arithmetic unit, an evolution arithmetic unit, a small selection comparator and a switcher;
the first division arithmetic unit takes the ratio of the pressure of the adjusting stage to the pressure of the main steam as a first ratio and transmits the first ratio to a third division arithmetic unit;
the second division arithmetic unit takes the ratio of the regulating stage pressure of the regulating valve full-opening working condition and the main steam pressure of the regulating valve full-opening working condition as a second ratio and transmits the second ratio to a third division arithmetic unit;
the third division arithmetic unit multiplies the first ratio and the second ratio by 100 through the first multiplication arithmetic unit to be used as the main steam flow; the output end of the first multiplication arithmetic unit is also connected with the Y end of the switcher;
when the ratio of the regulating stage pressure to the main steam pressure is greater than or equal to the critical pressure ratio, the subtraction arithmetic unit respectively subtracts the regulating stage pressure and the main steam pressure ratio after correction of a correction function;
the squaring arithmetic unit squars the result of the subtraction arithmetic unit and outputs the result to a second multiplication arithmetic unit;
and the second multiplication operator multiplies the result after the division by 5 to obtain a correction coefficient and outputs the correction coefficient to a fourth division operator, the input end of the fourth division operator is also connected with the output end of the first multiplier, and the output end of the fourth division operator is connected to the N end of the switcher.
Example III
The embodiment of the present specification provides a data processing apparatus configured to include the backpressure modification function setting system related to the valve management of the steam turbine in the second embodiment.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or materials described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. A backpressure correction function setting method relating to the management of a steam turbine valve is characterized in that,
the method comprises the following steps:
controlling a high regulating valve of the steam turbine unit to be fully opened, and raising the pressure of the steam turbine unit to a rated main steam pressure value;
putting the steam turbine unit into a boiler following mode, controlling the pressure of the steam turbine unit at a rated main steam pressure value, and automatically controlling the main steam pressure in a closed loop mode by a main controller of the boiler;
reducing the main control instruction of the steam turbine unit, and reducing the load of the steam turbine unit to a set ratio;
collecting characteristic data of parameters of pressure and main steam pressure of a regulating stage;
calculating main steam flow data based on the collected regulating stage pressure and main steam pressure parameter characteristic data, and obtaining main steam flow percentage;
taking the critical pressure ratio as a reference segmentation point, and calculating corresponding nozzle area flow data in a segmentation manner;
when the ratio of the adjusting stage pressure to the main steam pressure is smaller than the critical pressure ratio, the nozzle area flow is equal to the main steam flow;
when the ratio of the adjusting stage pressure to the main steam pressure is larger than or equal to the critical pressure ratio, the ratio of the adjusting stage pressure to the main steam pressure is subtracted after being corrected by a correction function, the subtracted value is multiplied by a multiple gain through squaring to serve as a correction coefficient, and the main steam flow is divided by the correction coefficient to obtain the nozzle area flow.
2. The method for setting the backpressure correction function related to the valve management of the steam turbine as claimed in claim 1, wherein when the high regulating valve of the steam turbine unit is controlled to be fully opened and the pressure of the steam turbine unit is increased to a rated main steam pressure value, the primary frequency regulation function of the steam turbine unit is cut off.
3. The method as claimed in claim 1, wherein the method for setting the back pressure correction function related to the valve management of the steam turbine is characterized in that when the main control command of the steam turbine unit is reduced, the main control load reduction rate of the steam turbine unit is set, and the load of the unit is reduced at the rate.
4. The method of claim 1, wherein the collecting the characteristic data of the pressure parameter of the regulating stage and the main steam pressure comprises:
based on the history curve, the pressure of the regulating stage and the main steam pressure are collected when the regulating valve is fully opened, and
each valve point corresponds to the regulating stage pressure and the main steam pressure.
5. The method of claim 4, wherein the main steam flow percentage is obtained by dividing the ratio of the pressure of the regulating stage to the main steam pressure at each valve point by the ratio of the pressure of the regulating stage to the main steam pressure when the regulating valve is fully opened, and the main steam flow is obtained.
6. The method of claim 1, wherein the correction function is:
f(x)＝x1.626；
g(x)＝x1.813；
wherein x is the ratio of the pressure of the regulating stage to the main steam pressure.
7. The method as claimed in claim 1, wherein the backpressure modification function setting method comprises obtaining a backpressure modification function of the nozzle area flow corresponding to the main steam flow based on a corresponding relationship between the main steam flow and the nozzle area flow.
8. A backpressure correction function setting system relating to turbine valve management is characterized by comprising: the device comprises a first division arithmetic unit, a second division arithmetic unit, a third division arithmetic unit, a fourth division arithmetic unit, a first multiplication arithmetic unit, a second multiplication arithmetic unit, a subtraction arithmetic unit, an evolution arithmetic unit, a small selection comparator and a switcher;
the first division arithmetic unit takes the ratio of the pressure of the adjusting stage to the pressure of the main steam as a first ratio and transmits the first ratio to a third division arithmetic unit;
the second division arithmetic unit takes the ratio of the regulating stage pressure of the regulating valve full-opening working condition and the main steam pressure of the regulating valve full-opening working condition as a second ratio and transmits the second ratio to a third division arithmetic unit;
the third division arithmetic unit multiplies the first ratio and the second ratio by 100 through the first multiplication arithmetic unit to be used as the main steam flow; the output end of the first multiplication arithmetic unit is also connected with the Y end of the switcher;
when the ratio of the regulating stage pressure to the main steam pressure is greater than or equal to the critical pressure ratio, the subtraction arithmetic unit respectively subtracts the regulating stage pressure and the main steam pressure ratio after correction of a correction function;
the squaring arithmetic unit squars the result of the subtraction arithmetic unit and outputs the result to a second multiplication arithmetic unit;
the second multiplier multiplies the result after the division by the gain multiple to obtain a correction coefficient, and outputs the correction coefficient to a fourth divider, the input end of the fourth divider is also connected with the output end of the first multiplier, and the output end of the fourth divider is connected to the N end of the switcher.
9. A data processing apparatus configured to include a back pressure correction function tuning system relating to turbine valve management as claimed in claim 8.
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| CN114776397B (en) * | 2022-02-28 | 2023-10-20 | 鞍钢股份有限公司 | Automatic control method for main steam pressure of small steam turbine generator unit |
| CN114753892B (en) * | 2022-04-20 | 2023-07-21 | 西安热工研究院有限公司 | Method and device for controlling main steam pressure of steam turbine and electronic equipment |
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