CN111123770B - Method and device for determining opening of bypass model under FCB working condition - Google Patents
Method and device for determining opening of bypass model under FCB working condition Download PDFInfo
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- CN111123770B CN111123770B CN201911282582.6A CN201911282582A CN111123770B CN 111123770 B CN111123770 B CN 111123770B CN 201911282582 A CN201911282582 A CN 201911282582A CN 111123770 B CN111123770 B CN 111123770B
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- G05B19/00—Programme-control systems
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention provides a method and a device for determining the opening of a bypass model under an FCB (fuzzy c-means) working condition. The method for determining the opening of the bypass model under the FCB working condition comprises the steps of obtaining main steam pressure, main steam flow and main steam temperature, and calculating a flow coefficient under the current working condition; calculating the opening of the bypass valve according to a known flow coefficient model of the bypass valve, meeting the requirement of instantaneous flow and avoiding the overpressure of the boiler; calculating the steam flow passing through the bypass under the current bypass valve opening according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; and calculating the opening of the temperature-reducing water valve according to the known flow coefficient model of the temperature-reducing water valve.
Description
Technical Field
The invention belongs to the field of thermal power unit control, and particularly relates to a method and a device for determining the opening of a bypass model under an FCB (fuzzy C-means) working condition.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the operation process of the thermal power generating unit, all external power supply loads are instantly thrown off under the conditions of power grid faults, generator disconnection, turbine tripping and the like, and the unit has an automatic control function of 'carrying service power island operation', 'maintaining rated rotating speed of a steam turbine' or 'stopping without stopping a furnace'. The complete FCB (fast cut back) can control the unit to continue to operate after load shedding, and the unit is quickly connected to the network again to carry the load after external faults such as a line, a power grid and the like are eliminated, so that the time for carrying the load again is greatly shortened. Meanwhile, if the extreme condition of large-area power failure of the power grid occurs, the power grid can be used as a starting power supply point of 'black start' of the power grid, support is provided for quick recovery of the power grid, and even if external faults of the power grid cannot be eliminated in a short time, the unit can be safely shut down.
The key to the success of the FCB is that the proper opening is automatically and quickly opened according to the current unit load bypass under the FCB working condition: firstly, the bypass is quickly opened to prevent the boiler from overpressure and protect the boiler from safety; secondly, after the bypass is opened quickly, the steam flow behind the bypass is increased instantaneously, the bypass desuperheating water regulating valve needs to be opened by a certain opening degree quickly to control the steam temperature behind the bypass, and the phenomenon that the steam temperature behind the bypass is overtemperature to cause bypass protection to be closed, so that the FCB fails, is avoided.
The inventor finds that the steam through flow rate after the bypass is quickly opened and the steam flow rate of the unit at the time are not matched under the FCB working condition, and the input amount of bypass desuperheating water after the bypass is quickly opened and the instantaneously required desuperheating water amount are also not matched.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for determining the opening of a bypass model under an FCB working condition, which can guarantee the success rate of the FCB and improve the operation efficiency of a generator set.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for determining the opening of a bypass model under an FCB working condition, which comprises the following steps:
obtaining main steam pressure P1, main steam flow m and main steam temperature T, and calculating flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor;
known flow coefficient model K based on bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve to meet the requirement of instantaneous flux and avoid the overpressure of the boiler;
according to the known valve flow characteristic curve of the bypass valve, the steam flow F passing through the bypass under the current bypass valve opening degree alpha is calculatedS；
Calculating to obtain the temperature-reduced water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
obtaining the flow coefficient K of the desuperheating water valve through a valve flow coefficient calculation formula according to the required desuperheating water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
model K of known flow coefficient of desuperheating water valvev desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
The second aspect of the present invention provides a device for determining the opening of a bypass model under an FCB condition, including:
a current working condition flow coefficient calculation module for obtaining the main steam pressure P1, the main steam flow m and the main steam temperature T and calculating the flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor;
a bypass valve opening calculation module for calculating a bypass valve opening according to a known flow coefficient model K of the bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve to meet the requirement of instantaneous flux and avoid the overpressure of the boiler;
a bypass steam flow determination module for calculating the steam flow F passing through the bypass under the current bypass valve opening alpha according to the known valve flow characteristic curve of the bypass valveS；
A required desuperheating water flow calculation module for calculating desuperheating water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
a flow coefficient calculation module of the temperature-reducing water valve, which is used for obtaining the flow coefficient K of the temperature-reducing water valve through a valve flow coefficient calculation formula according to the required temperature-reducing water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
the opening determining module of the temperature-reducing water valve is used for determining the opening of the temperature-reducing water valve according to a known flow coefficient model of the temperature-reducing water valve:
Kv desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for determining the opening degree of the bypass model in the FCB operating condition as described above.
A fourth aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps in the method for determining the opening degree of the bypass model under the FCB operating condition.
The invention has the beneficial effects that:
(1) the method comprises the steps of obtaining main steam pressure, main steam flow and main steam temperature, and calculating a flow coefficient under the current working condition; according to a known flow coefficient model of the bypass valve, the opening of the bypass valve is calculated, the requirement of instantaneous through flow is met, the overpressure of the boiler is avoided, and the problem that the through flow of steam after the bypass is quickly opened is not matched with the steam flow of a unit at that time under the FCB working condition is solved;
(2) calculating the steam flow passing through the bypass under the current bypass opening according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; by the known flow coefficient model of desuperheating water valve, calculate desuperheating water valve opening, solved the unmatched problem of the desuperheating water yield of bypass desuperheating water input volume and instantaneous demand after the bypass is opened soon, can open bypass desuperheating water valve regulating gate fast in order to control bypass after-temperature, avoid behind the bypass steam temperature overtemperature to lead to the bypass protection to close, guarantee FCB success rate improves generating set operating efficiency.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of a method for determining an opening of a bypass model under an FCB working condition according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for determining the opening of the bypass model under the FCB operating condition according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention 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 exemplary embodiments according to the invention. 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.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Example 1
Fig. 1 is a flowchart of a method for determining the opening of the bypass model under the FCB operating condition according to the present embodiment.
As shown in fig. 1, the method for determining the opening of the bypass model under the FCB operating condition of the embodiment includes:
step S101: obtaining main steam pressure P1, main steam flow m and main steam temperature T, and calculating flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor;
in the specific implementation, the main steam pressure is detected by a pressure sensor arranged on a main boiler pipe; the main steam flow is detected by a flow sensor arranged on a main boiler pipeline; the main steam temperature is detected by a temperature sensor arranged on the main boiler pipeline.
Step S102: known flow coefficient model K based on bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve,the instantaneous flow demand is met, and the overpressure of the boiler is avoided;
step S103: according to the known valve flow characteristic curve of the bypass valve, the steam flow F passing through the bypass under the current bypass valve opening degree alpha is calculatedS；
The abscissa of the valve flow characteristic curve is the valve opening, and the ordinate is the steam flow under the corresponding valve opening.
The valve flow characteristic curves corresponding to different valves are different.
Step S104: calculating to obtain the temperature-reduced water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
in particular implementations, the enthalpy may be measured using an enthalpy sensor, such as an HTC105-H enthalpy sensor, or the like.
Step S105: obtaining the flow coefficient K of the desuperheating water valve through a valve flow coefficient calculation formula according to the required desuperheating water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
step S106: model K of known flow coefficient of desuperheating water valvev desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
In the embodiment, the flow coefficient under the current working condition is calculated by obtaining the main steam pressure, the main steam flow and the main steam temperature; according to a known flow coefficient model of the bypass valve, the opening of the bypass valve is calculated, the requirement of instantaneous through flow is met, the overpressure of the boiler is avoided, and the problem that the through flow of steam after the bypass is quickly opened is not matched with the steam flow of a unit at that time under the FCB working condition is solved;
in the embodiment, the steam flow passing through the bypass under the current bypass opening degree is calculated according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; by the known flow coefficient model of desuperheating water valve, calculate desuperheating water valve opening, solved the unmatched problem of the desuperheating water yield of bypass desuperheating water input volume and instantaneous demand after the bypass is opened soon, can open bypass desuperheating water valve regulating gate fast in order to control bypass after-temperature, avoid behind the bypass steam temperature overtemperature to lead to the bypass protection to close, guarantee FCB success rate improves generating set operating efficiency.
Example 2
Fig. 2 is a schematic structural diagram of the bypass model opening determining device in the FCB operating condition according to the present embodiment.
As shown in fig. 2, the apparatus for determining the opening of the bypass model under the FCB operating condition provided in this embodiment includes:
(1) a current working condition flow coefficient calculation module for obtaining the main steam pressure P1, the main steam flow m and the main steam temperature T and calculating the flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor;
in the specific implementation, the main steam pressure is detected by a pressure sensor arranged on a main boiler pipe; the main steam flow is detected by a flow sensor arranged on a main boiler pipeline; the main steam temperature is detected by a temperature sensor arranged on the main boiler pipeline.
(2) A bypass valve opening calculation module for calculating a bypass valve opening according to a known flow coefficient model K of the bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve to meet the requirement of instantaneous flux and avoid the overpressure of the boiler;
(3) bypass pathA steam flow determination module for calculating the steam flow F passing through the bypass under the current bypass valve opening alpha according to the known valve flow characteristic curve of the bypass valveS；
The abscissa of the valve flow characteristic curve is the valve opening, and the ordinate is the steam flow under the corresponding valve opening.
The valve flow characteristic curves corresponding to different valves are different.
(4) A required desuperheating water flow calculation module for calculating desuperheating water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
in particular implementations, the enthalpy may be measured using an enthalpy sensor, such as an HTC105-H enthalpy sensor, or the like.
(5) A flow coefficient calculation module of the temperature-reducing water valve, which is used for obtaining the flow coefficient K of the temperature-reducing water valve through a valve flow coefficient calculation formula according to the required temperature-reducing water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
(6) the opening determining module of the temperature-reducing water valve is used for determining the opening of the temperature-reducing water valve according to a known flow coefficient model of the temperature-reducing water valve:
Kv desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
In the embodiment, the flow coefficient under the current working condition is calculated by obtaining the main steam pressure, the main steam flow and the main steam temperature; according to a known flow coefficient model of the bypass valve, the opening of the bypass valve is calculated, the requirement of instantaneous through flow is met, the overpressure of the boiler is avoided, and the problem that the through flow of steam after the bypass is quickly opened is not matched with the steam flow of a unit at that time under the FCB working condition is solved;
in the embodiment, the steam flow passing through the bypass under the current bypass opening degree is calculated according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; by the known flow coefficient model of desuperheating water valve, calculate desuperheating water valve opening, solved the unmatched problem of the desuperheating water yield of bypass desuperheating water input volume and instantaneous demand after the bypass is opened soon, can open bypass desuperheating water valve regulating gate fast in order to control bypass after-temperature, avoid behind the bypass steam temperature overtemperature to lead to the bypass protection to close, guarantee FCB success rate improves generating set operating efficiency.
Example 3
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the steps in the method for determining the opening of the bypass model under the FCB condition as shown in fig. 1.
In the embodiment, the flow coefficient under the current working condition is calculated by obtaining the main steam pressure, the main steam flow and the main steam temperature; according to a known flow coefficient model of the bypass valve, the opening of the bypass valve is calculated, the requirement of instantaneous through flow is met, the overpressure of the boiler is avoided, and the problem that the through flow of steam after the bypass is quickly opened is not matched with the steam flow of a unit at that time under the FCB working condition is solved;
in the embodiment, the steam flow passing through the bypass under the current bypass opening degree is calculated according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; by the known flow coefficient model of desuperheating water valve, calculate desuperheating water valve opening, solved the unmatched problem of the desuperheating water yield of bypass desuperheating water input volume and instantaneous demand after the bypass is opened soon, can open bypass desuperheating water valve regulating gate fast in order to control bypass after-temperature, avoid behind the bypass steam temperature overtemperature to lead to the bypass protection to close, guarantee FCB success rate improves generating set operating efficiency.
Example 4
The embodiment provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the method for determining the opening degree of the bypass model under the FCB working condition as shown in fig. 1.
In the embodiment, the flow coefficient under the current working condition is calculated by obtaining the main steam pressure, the main steam flow and the main steam temperature; according to a known flow coefficient model of the bypass valve, the opening of the bypass valve is calculated, the requirement of instantaneous through flow is met, the overpressure of the boiler is avoided, and the problem that the through flow of steam after the bypass is quickly opened is not matched with the steam flow of a unit at that time under the FCB working condition is solved;
in the embodiment, the steam flow passing through the bypass under the current bypass opening degree is calculated according to the known valve flow characteristic curve of the bypass valve; calculating to obtain the flow of the desuperheating water required for reducing the current steam temperature to the target temperature according to the flow of the steam passing through the bypass and the enthalpy value; obtaining a flow coefficient of a desuperheating water valve through a valve flow coefficient calculation formula according to the obtained required desuperheating water flow; by the known flow coefficient model of desuperheating water valve, calculate desuperheating water valve opening, solved the unmatched problem of the desuperheating water yield of bypass desuperheating water input volume and instantaneous demand after the bypass is opened soon, can open bypass desuperheating water valve regulating gate fast in order to control bypass after-temperature, avoid behind the bypass steam temperature overtemperature to lead to the bypass protection to close, guarantee FCB success rate improves generating set operating efficiency.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for determining the opening degree of a bypass model under an FCB working condition is characterized by comprising the following steps:
obtaining main steam pressure P1, main steam flow m and main steam temperature T, and calculating flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor; the main steam pressure is detected by a pressure sensor arranged on the main boiler pipeline; the main steam flow is detected by a flow sensor arranged on a main boiler pipeline; the main steam temperature is detected by a temperature sensor arranged on a main boiler pipeline;
known flow coefficient model K based on bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve to meet the requirement of instantaneous flux and avoid the overpressure of the boiler;
according to the known valve flow characteristic curve of the bypass valve, the steam flow F passing through the bypass under the current bypass valve opening degree alpha is calculatedS；
Calculating to obtain the temperature-reduced water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
obtaining the flow coefficient K of the desuperheating water valve through a valve flow coefficient calculation formula according to the required desuperheating water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
model K of known flow coefficient of desuperheating water valvev desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
2. The method for determining the opening of the bypass model under the FCB operating condition according to claim 1, wherein the abscissa of the valve flow characteristic curve is the valve opening and the ordinate is the steam flow at the corresponding valve opening.
3. The method for determining the opening of the bypass model under the FCB condition according to claim 1, wherein the valve flow characteristic curves corresponding to different valves are different.
4. A bypass model opening determination device under an FCB working condition is characterized by comprising:
a current working condition flow coefficient calculation module for obtaining the main steam pressure P1, the main steam flow m and the main steam temperature T and calculating the flow coefficient K under the current working conditionv；
Wherein a and b are both constants, TsIs the saturated steam temperature at the main steam pressure, KfIs a correction factor; the main steam pressure is detected by a pressure sensor arranged on the main boiler pipeline; the main steam flow is detected by a flow sensor arranged on a main boiler pipeline; the main steam temperature is sensed by a temperature sensor arranged on the main boiler pipelineDetecting the detected signal;
a bypass valve opening calculation module for calculating a bypass valve opening according to a known flow coefficient model K of the bypass valvevF1 (alpha), calculating the opening alpha of the bypass valve to meet the requirement of instantaneous flux and avoid the overpressure of the boiler;
a bypass steam flow determination module for calculating the steam flow F passing through the bypass under the current bypass valve opening alpha according to the known valve flow characteristic curve of the bypass valveS；
A required desuperheating water flow calculation module for calculating desuperheating water flow F required for reducing the current steam temperature to the target temperature according to the steam flow passing through the bypass and the enthalpy valueW；
Wherein HHPThe enthalpy value of the main steam is; hHP0Is a target steam enthalpy value; hHP1Is the enthalpy value of the reduced temperature water;
a flow coefficient calculation module of the temperature-reducing water valve, which is used for obtaining the flow coefficient K of the temperature-reducing water valve through a valve flow coefficient calculation formula according to the required temperature-reducing water flowv desuperheating water；
Where ρ (T)Temperature reducing water) For reducing the temperature T of the waterTemperature reducing waterA corresponding density function; delta rho is the pressure difference before and after the valve;
the opening determining module of the temperature-reducing water valve is used for determining the opening of the temperature-reducing water valve according to a known flow coefficient model of the temperature-reducing water valve:
Kv desuperheating waterF2 (beta), and determining the opening beta of the temperature reduction water valve.
5. The apparatus for determining the opening of the bypass model under the FCB operating condition according to claim 4, wherein the abscissa of the valve flow characteristic curve is the valve opening and the ordinate is the steam flow at the corresponding valve opening.
6. The apparatus for determining the opening of the bypass model during the FCB operating condition of claim 4, wherein the valve flow characteristic curves for different valves are different.
7. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method for determining the opening of a bypass model in an FCB operating condition according to any one of claims 1-3.
8. Computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the program performs the steps of the method for determining the opening of a bypass model in an FCB condition according to any of claims 1-3.
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| CN111664442B (en) * | 2020-07-22 | 2021-12-10 | 中国电力工程顾问集团西北电力设计院有限公司 | Desuperheating water control method, system and equipment based on heat value calculation and readable storage medium |
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