CN114034033A - Heater liquid level control method and terminal for heat-engine plant feed water regenerative system - Google Patents
Heater liquid level control method and terminal for heat-engine plant feed water regenerative system Download PDFInfo
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Abstract
The invention provides a method and a terminal for controlling the liquid level of a heater of a water supply regenerative system of a thermal power plant, which are used for calling parameter data of a steam turbine generator unit stored in a database; classifying the electric power of the turbo generator set, and calculating the steam extraction coefficients of all levels and the heat consumption rate of the turbo generator set; comparing the heat economy of different heater liquid levels under the same turbo generator unit electric power, and accumulating and iteratively calculating to obtain the optimal working condition point of each heater liquid level under different loads; configuring a working condition curve by taking the load of the unit as an abscissa and the liquid level of the heater as an ordinate; recording the working condition curve into a DCS control system, and collecting electric power of a steam turbine generator unit in real time to obtain preset target liquid levels of all heaters; and comparing the difference value between the actual liquid level and the target liquid level, and adjusting the target value to a preset target liquid level at a constant rate. The method can realize the automatic control of the heater liquid level of the thermal power plant feedwater heat recovery system along with the load change based on the DCS system, so that the heat recovery system has the best operation economy.
Description
Technical Field
The invention relates to the technical field of power system control, in particular to a method and a terminal for controlling the liquid level of a heater of a regenerative feedwater heating system of a thermal power plant.
Background
At present, a regenerative system for feedwater of a thermal power plant extracts a part of steam from a plurality of intermediate stages of a steam turbine in steam thermal power cycle, and the steam is sent to a feedwater heater to be used for heating boiler feedwater, so that the average temperature of a working medium in a heat absorption process of a boiler is increased, and the thermal economy of a unit is improved. The regenerative heating system of the feed water is the most basic component of the principle thermodynamic system, the purpose of adopting steam to heat the boiler feed water is to reduce the loss of a cold source, a certain amount of steam does not release heat to the environment in a condenser after doing partial work, namely, the heat of the steam is prevented from being taken away by the environment, the heat of the steam is fully utilized, the heat consumption rate is reduced, meanwhile, the steam which does partial work in a steam turbine is utilized to heat the feed water, the feed water temperature is improved, the heat transfer temperature difference of the heating surface of the boiler is reduced, thereby reducing the irreversible loss in the feed water heating process, and the heat absorption capacity in the boiler is correspondingly reduced. The reason is synthesized to show that the regenerative water heating system improves the cycle thermal efficiency of the unit, so that the steam turbine adopts the regenerative heating system to have a decisive effect on improving the operation economy of the unit, and the operational reliability and the economic advantage of the regenerative heating system directly influence the operation economy of the whole unit.
In the actual production process of a thermal power plant, the heater liquid level under the fixed load is determined through a performance test, the enthusiasm of operators for adjusting parameters is improved by means of index competition, so that the operation efficiency of the regenerative feedwater heating system is improved, the problems of adjustment lag, low accuracy and poor economy still exist, how to quickly respond to the change of the load working condition to adjust the heater liquid level and achieving the optimal economical efficiency of the regenerative feedwater heating system in real time still needs to be solved urgently.
Disclosure of Invention
The invention provides a method for controlling the liquid level of a heater of a water supply regenerative system of a thermal power plant, which can realize the method for automatically controlling the liquid level of the heater of the water supply regenerative system of the thermal power plant to follow the load change based on a DCS (distributed control system), so that the operation economy of the regenerative system is optimal.
The method comprises the following steps: s1, calling parameter data of a steam turbine generator unit stored in a database;
the parameter data includes: the load of a steam turbine generator unit, each extraction pressure and temperature, water supply flow, condensate flow, main steam pressure, temperature and flow, exhaust temperature and pressure, each heater liquid level, water side inlet pressure, temperature and outlet pressure temperature and drainage temperature of each heater;
s2, classifying the electric power of the steam turbine generator unit, and calculating the steam extraction coefficients and the unit heat consumption rate of each stage by using parameter data and combining a substance balance principle and a heat balance principle;
s3, comparing the heat economy of different heater liquid levels under the same turbo generator unit electric power, and accumulating and iteratively calculating to obtain the optimal working condition point of each heater liquid level under different loads;
s4, configuring a working condition curve by taking the unit load as an abscissa and the heater liquid level as an ordinate;
s5, recording the working condition curve into a DCS control system, and collecting electric power of the steam turbine generator unit in real time to obtain preset target liquid levels of the heaters;
s6, comparing the difference value between the actual liquid level and the target liquid level, and adjusting the target value to a preset target liquid level at a constant rate.
It should be further noted that, in step S2, steam extraction coefficients at each stage are equivalently calculated by using the principle of material balance and heat balance;
and calculating the heat consumption rate of the corresponding historical working condition by using the steam extraction coefficients of all levels, and iteratively calculating the historical lowest heat consumption working condition under the electric load working condition, namely the optimal liquid level of each heater.
It should be further noted that, in step S2, abnormal operating conditions are screened out by analyzing the historical operating conditions of the system, the electrical load of the steam turbine generator unit is classified, and when the rated electrical load is taken as an example, the corresponding heat rate at different heater liquid levels is calculated by iteratively calculating all operating conditions under the load when the rated electrical load is applied.
It should be further noted that in step S3, two different operation mode conditions of the same condensate pump outlet temperature under the same unit load are selected, when the historical operating condition point of the condensate pump outlet temperature is insufficient, the influence of the steam exhaust temperature deviation on the heat consumption of the steam turbine is corrected, the back pressure heat consumption correction curve is used to calculate the micro-boost power of the generator,
the heat consumption can be expressed as a percentage of the effect obtained in the performance test, such as: if the circulating water supply temperature affects 1% of heat consumption, the calculation method is that delta N is equal to (1% -1) P0；
Data preliminary processing of each stage-by-stage drainage heater:
τjspecific enthalpy of the condensed water of unit mass passing through a heater is increased;
qjheat quantity released by cooling steam with unit mass through a heater;
γjthe heat quantity released by cooling the hydrophobic water with a heater is unit mass;
coefficient of steam extraction alphajOf the general formula (1):
the fraction of the (j-1) th hydrophobic portion is defined as above if the (j-1) th hydrophobic portion is hydrophobic, and is removed if the (j-1) th hydrophobic portion is not hydrophobic. Actual specific internal work omega of steam turbineitComprises the following steps:
αrhthe coefficient is the heat recovery steam extraction coefficient;
qrhis reheat steam endotherm;
αsgjthe shaft seal steam quantity;
cyclic internal work omega of new steam per unit massi
ωi＝ωit-τp
τpThe enthalpy of the feed pump is increased;
the circulating heat absorption capacity q of the new steam of unit mass;
q＝h0+αrhqrh-hfw
actual cycle efficiency η;
heat rate q of the steam turbine being
D0The steam consumption of the steam turbine generator unit;
p is the power of the steam turbine;
ηmmechanical efficiency;
ηgto the generator efficiency;
and repeating the steps to obtain the economic comparison of different heater liquid levels under different unit loads, and obtaining the working condition with the lowest heat consumption rate, namely the optimal liquid level working point of each heater liquid level combination under the electric load.
Further, when the state of the DCS is abnormal, the automatic control system is removed, and an alarm is given;
while initiating manual intervention adjustments.
It should be further noted that, in step S5, the electric load data of the turbo generator set is recorded in real time into the DCS control system to obtain an operation condition curve, and the target values of the liquid levels of the heaters are output according to the coordinates.
It is further noted that, in step S6, the difference between the optimal liquid level and the target liquid level is compared, and the actual liquid level is adjusted to the preset target liquid level at a constant rate.
And when the heat consumption rate is calculated, establishing a calculation model to iterate the minimum heat consumption working condition according to the calculation result.
It should be further noted that the classification method for the electric power of the steam turbine generator unit includes:
the electric loads of the turbo-generator units are classified according to 50%, 60%, 70%, 80%, 90% and 100%.
The invention also provides a terminal for realizing the method for controlling the liquid level of the heater of the regenerative feedwater heating system of the thermal power plant, which comprises the following steps:
the storage is used for storing a computer program and a liquid level control method of a heater of a feedwater heat recovery system of a thermal power plant;
and the processor is used for executing the computer program and the method for controlling the liquid level of the heater of the regenerative feedwater system of the thermal power plant so as to realize the steps of the method for controlling the liquid level of the heater of the regenerative feedwater system of the thermal power plant.
According to the technical scheme, the invention has the following advantages:
the method for controlling the liquid level of the heater of the water supply regenerative system of the thermal power plant can acquire the electric load of the real-time steam turbine generator unit and obtain the optimal target liquid level of each heater by using the working condition curve; and comparing the difference value between the actual liquid level and the target liquid level, and slowly adjusting the set value to the optimal target liquid level at a constant speed. The method can realize the automatic control of the heater liquid level of the thermal power plant feedwater heat recovery system along with the load change based on the DCS system, so that the heat recovery system has the best operation economy.
In the actual production process of the thermal power plant, the invention determines the liquid level of the heater under the fixed load through a performance test, and improves the enthusiasm of operators for adjusting parameters by assisting index competition, so as to improve the operation efficiency of the regenerative feedwater heating system. The invention aims at the steam turbine water supply regenerative system, realizes the real-time automatic control of the liquid level of the heater through the analysis and the processing of historical data and based on a DCS control system, and achieves the aim of continuously and optimally operating the steam turbine regenerative system.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling the liquid level of a heater of a regenerative feedwater heating system of a thermal power plant;
FIG. 2 is a graph illustrating an optimal liquid level operation of a heater according to an embodiment of the present invention;
FIG. 3 is a logic diagram of a method for automatically controlling the heater liquid level of a regenerative feedwater heating system of a thermal power plant.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The units and algorithm steps of each example described in the embodiments disclosed in the method for controlling the liquid level of the regenerative thermal system heater of the thermal power plant according to the present invention can be implemented by electronic hardware, computer software, or a combination of the two. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagram shown in the attached drawings of the method for controlling the liquid level of the heater of the regenerative feedwater system of the thermal power plant is only a functional entity and does not necessarily correspond to a physically independent entity. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
As shown in fig. 1, the method for controlling the liquid level of the heater of the regenerative feedwater heating system of the thermal power plant provided by the invention comprises the following steps:
s1, calling parameter data of a steam turbine generator unit stored in a database;
the parameter data includes: the load of a steam turbine generator unit, each extraction pressure and temperature, water supply flow, condensate flow, main steam pressure, temperature and flow, exhaust temperature and pressure, each heater liquid level, water side inlet pressure, temperature and outlet pressure temperature and drainage temperature of each heater;
namely, a historical working condition set is established on the basis of parameter data, and historical data is processed by utilizing a reference enthalpy entropy diagram and reference design data.
S2, classifying the electric power of the steam turbine generator unit, and calculating the steam extraction coefficients and the unit heat consumption rate of each stage by using parameter data and combining a substance balance principle and a heat balance principle;
the classification method of the electric power of the steam turbine generator unit comprises the following steps: the electric loads of the turbo-generator units are classified according to 50%, 60%, 70%, 80%, 90% and 100%.
Further, the steam extraction coefficients of all levels are equivalently calculated by utilizing the principle of material balance and heat balance;
and calculating the heat consumption rate of the corresponding historical working condition by using the steam extraction coefficients of all levels, and iteratively calculating the historical lowest heat consumption working condition under the electric load working condition, namely the optimal liquid level of each heater.
In step S2, abnormal operating conditions are screened out by analyzing the historical operating conditions of the system, the electrical load of the turbo generator set is classified, and when the electrical load is rated, the corresponding heat rate at different heater liquid levels is calculated by iteratively calculating all operating conditions under the load, taking the rated electrical load as an example.
That is to say, the invention processes the historical data stored in the database, takes the historical database as the basic data, takes the water vapor enthalpy entropy chart and the unit thermal performance test data as the support, and obtains the basic data processing basis. Extracting unit load, each extraction pressure and temperature, water supply flow, condensate flow, main steam pressure, temperature and flow, steam exhaust temperature and pressure, each heater liquid level, water side inlet pressure, temperature and outlet pressure temperature in a historical database, taking drainage temperature of each heater as historical working condition data, and carrying out classified statistics on historical working conditions of the 6 nodes by using electric loads;
the historical data extraction needs to be carried out on screening of the high-pressure heater and low-pressure heater switching-off conditions so as to eliminate the influence of uncontrollable factors caused by heater switching-off or abnormal measuring points;
s3, comparing the heat economy of different heater liquid levels under the same turbo generator unit electric power, and accumulating and iteratively calculating to obtain the optimal working condition point of each heater liquid level under different loads;
selecting two different operation mode working conditions of the same condensate pump outlet temperature under the same unit load, correcting the influence of steam exhaust temperature deviation on the heat consumption of the steam turbine when the historical working condition point of the condensate pump outlet temperature is insufficient, calculating the micro-power increase of the generator by utilizing a back pressure heat consumption correction curve,
the heat consumption can be expressed as a percentage of the effect obtained in the performance test, such as: the influence of the water supply temperature of the circulating water is 1 percentThe heat loss is calculated by the method of (1% -1) P0；
Data preliminary processing of each stage-by-stage drainage heater:
τjspecific enthalpy of the condensed water of unit mass passing through a heater is increased;
qjheat quantity released by cooling steam with unit mass through a heater;
γjthe heat quantity released by cooling the hydrophobic water with a heater is unit mass;
coefficient of steam extraction alphajOf the general formula (1):
the fraction of the (j-1) th hydrophobic portion is defined as above if the (j-1) th hydrophobic portion is hydrophobic, and is removed if the (j-1) th hydrophobic portion is not hydrophobic. Actual specific internal work omega of steam turbineitComprises the following steps:
αrhthe coefficient is the heat recovery steam extraction coefficient;
qrhis reheat steam endotherm;
αsgjthe shaft seal steam quantity;
cyclic internal work omega of new steam per unit massi
ωi＝ωit-τp
τpThe enthalpy of the feed pump is increased;
the circulating heat absorption capacity q of the new steam of unit mass;
q＝h0+αrhqrh-hfw
actual cycle efficiency η;
heat rate q of the steam turbine being
D0The steam consumption of the steam turbine generator unit;
p is the power of the steam turbine;
ηmmechanical efficiency;
ηgto the generator efficiency;
and repeating the steps to obtain the economic comparison of different heater liquid levels under different unit loads, and obtaining the working condition with the lowest heat consumption rate, namely the optimal liquid level working point of each heater liquid level combination under the electric load.
S4, configuring a working condition curve by taking the unit load as an abscissa and the heater liquid level as an ordinate;
and linearly collecting the working condition points, taking the electric load (x) as an abscissa, taking the heater liquid level (y) as an ordinate, and obtaining a curve with the optimal operating liquid level of each heater under different loads. I.e., the optimal level operating mode curve for the heater in the embodiment of fig. 2.
S5, recording the working condition curve into a DCS control system, and collecting electric power of the steam turbine generator unit in real time to obtain preset target liquid levels of the heaters;
in the method, the electric load data of the steam turbine generator unit is recorded into a DCS (distributed control system) in real time to obtain an operation condition curve, and the target value of the liquid level of each heater is output according to the point where the coordinate falls.
When the DCS control system is abnormal, the automatic control is released, and an alarm prompt is given; while initiating manual intervention adjustments.
Writing the fitting curve into a DCS control system, taking the fitting curve as a core calculation method, updating and iterating relevant parameters of the fitting curve after the later-stage performance of relevant system equipment is changed, and realizing matching with actual field equipment, wherein a logic diagram is shown in an attached figure 3; y1max, y2max, y3max are 138 mm, y5max, y6max, y7max, y8max are 38 mm, y1min, y2min, y3min, y5min, y6min, y7min, y8min are 0 mm.
S6, comparing the difference value between the actual liquid level and the target liquid level, and adjusting the target value to a preset target liquid level at a constant rate.
And comparing the difference value between the optimal liquid level and the target liquid level, and adjusting the actual liquid level to a preset target liquid level at a constant rate.
And when the heat consumption rate is calculated, establishing a calculation model to iterate the minimum heat consumption working condition according to the calculation result.
In the method provided by the invention, the historical data processing method can acquire key parameters such as heat consumption rate and the like, and besides the method, the key parameters can also be acquired in other modes and expressed in a functional mode. In the running process of the automatic program, the optimal running mode curve of the control system only needs to be written once, automatic control can be realized without subsequent operation of operators, and when the actual equipment on site has larger running condition change, iteration can be carried out through the steps, relevant parameters in the program are changed, and real-time matching between the automatic control system and the site is realized.
The invention is further explained by taking an embodiment that a 350MW unit is provided with three high-pressure heaters, wherein a #3 high-pressure heater is provided with an external steam cooler arranged in front of a #1 high-pressure heater to heat feed water, and No. 5, 6, 7 and 8 low-pressure heaters to heat condensed water, wherein a corresponding heater of 4 pumps is a deaerator (hybrid heater), and in normal historical working condition optimization, the deaerator relates to safe operation of a feed water pump and is not in the optimization column, so that the optimized working condition of each working condition is the heater liquid level of #1, #2, #3, #5, #6, #7 and # 8. The curve of fig. 2 can be obtained through the data processing, and fig. 2 is written into a DCS control system to be used as a core calculation flow to automatically control the liquid level of each heater.
Based on the method for realizing the liquid level control of the heater of the regenerative feedwater heating system of the thermal power plant, the invention also provides a terminal, which comprises the following steps:
the storage is used for storing a computer program and a liquid level control method of a heater of a feedwater heat recovery system of a thermal power plant;
and the processor is used for executing the computer program and the method for controlling the liquid level of the heater of the regenerative feedwater system of the thermal power plant so as to realize the steps of the method for controlling the liquid level of the heater of the regenerative feedwater system of the thermal power plant.
The terminal for implementing the method for controlling the heater level of a regenerative thermal feedwater system of a thermal power plant is a unit and algorithm steps of the examples described in connection with the embodiments disclosed herein, and can be implemented in electronic hardware, computer software, or a combination of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
A terminal implementing a thermal power plant regenerative heating system heater level control method may program code for performing the operations of the present disclosure in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
In the actual production process of the thermal power plant, the invention determines the liquid level of the heater under the fixed load through a performance test, and improves the enthusiasm of operators for adjusting parameters by assisting index competition, so as to improve the operation efficiency of the regenerative feedwater heating system. The invention aims at the steam turbine water supply regenerative system, realizes the real-time automatic control of the liquid level of the heater through the analysis and the processing of historical data and based on a DCS control system, and achieves the aim of continuously and optimally operating the steam turbine regenerative system.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for controlling the liquid level of a heater of a regenerative feedwater heating system of a thermal power plant is characterized by comprising the following steps:
s1, calling parameter data of a steam turbine generator unit stored in a database;
the parameter data includes: the load of a steam turbine generator unit, each extraction pressure and temperature, water supply flow, condensate flow, main steam pressure, temperature and flow, exhaust temperature and pressure, each heater liquid level, water side inlet pressure, temperature and outlet pressure temperature and drainage temperature of each heater;
s2, classifying the electric power of the steam turbine generator unit, and calculating the steam extraction coefficients and the unit heat consumption rate of each stage by using parameter data and combining a substance balance principle and a heat balance principle;
s3, comparing the heat economy of different heater liquid levels under the same turbo generator unit electric power, and accumulating and iteratively calculating to obtain the optimal working condition point of each heater liquid level under different loads;
s4, configuring a working condition curve by taking the unit load as an abscissa and the heater liquid level as an ordinate;
s5, recording the working condition curve into a DCS control system, and collecting electric power of the steam turbine generator unit in real time to obtain preset target liquid levels of the heaters;
s6, comparing the difference value between the actual liquid level and the target liquid level, and adjusting the target value to a preset target liquid level at a constant rate.
2. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
in the step S2, the steam extraction coefficients at all levels are equivalently calculated by using the principle of material balance and heat balance;
and calculating the heat consumption rate of the corresponding historical working condition by using the steam extraction coefficients of all levels, and iteratively calculating the historical lowest heat consumption working condition under the electric load working condition, namely the optimal liquid level of each heater.
3. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
in step S2, abnormal operating conditions are screened out by analyzing the historical operating conditions of the system, the electrical loads of the turbo generator set are classified, and when the electrical loads are rated, the corresponding heat rate at different heater liquid levels is calculated by iteratively calculating all operating conditions under the loads, taking the rated electrical loads as an example.
4. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
in the step S3, in the step S,
selecting two different operation mode working conditions of the same condensate pump outlet temperature under the same unit load, correcting the influence of steam exhaust temperature deviation on the heat consumption of the steam turbine when the historical working condition point of the condensate pump outlet temperature is insufficient, calculating the micro-power increase of the generator by utilizing a back pressure heat consumption correction curve,
the heat consumption can be expressed as a percentage of the effect obtained in the performance test, such as: if the circulating water supply temperature affects 1% of heat consumption, the calculation method is that delta N is equal to (1% -1) P0；
Data preliminary processing of each stage-by-stage drainage heater:
τjspecific enthalpy of the condensed water of unit mass passing through a heater is increased;
qjheat quantity released by cooling steam with unit mass through a heater;
γjthe heat quantity released by cooling the hydrophobic water with a heater is unit mass;
coefficient of steam extraction alphajOf the general formula (1):
the fraction of the (j-1) th grade hydrophobic property is defined as above if the (j-1) th grade has hydrophobic property, and is removed if the (j-1) th grade has no hydrophobic property; actual specific internal work omega of steam turbineitComprises the following steps:
αrhthe coefficient is the heat recovery steam extraction coefficient;
qrhis reheat steam endotherm;
αsgjthe shaft seal steam quantity;
cyclic internal work omega of new steam per unit massi
ωi＝ωit-τp
τpThe enthalpy of the feed pump is increased;
the circulating heat absorption capacity q of the new steam of unit mass;
q＝h0+αrhqrh-hfw
actual cycle efficiency η;
heat rate q of the steam turbine being
D0The steam consumption of the steam turbine generator unit;
p is the power of the steam turbine;
ηmmechanical efficiency;
ηgto the generator efficiency;
and repeating the steps to obtain the economic comparison of different heater liquid levels under different unit loads, and obtaining the working condition with the lowest heat consumption rate, namely the optimal liquid level working point of each heater liquid level combination under the electric load.
5. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
when the DCS control system is abnormal, the automatic control is released, and an alarm prompt is given;
while initiating manual intervention adjustments.
6. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
in the step S5, the electric load data of the turbo generator set is recorded in real time into the DCS control system to obtain an operating condition curve, and the target values of the liquid levels of the heaters are output according to the coordinates of the falling points.
7. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
in step S6, the difference between the optimal liquid level and the target liquid level is compared, and the actual liquid level is adjusted to the preset target liquid level at a constant rate.
8. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 1,
and when the heat consumption rate is calculated, establishing a calculation model to iterate the minimum heat consumption working condition according to the calculation result.
9. The method for controlling the heater level of the regenerative thermal system for feedwater of a thermal power plant according to claim 5,
the classification method of the electric power of the steam turbine generator unit comprises the following steps:
the electric loads of the turbo-generator units are classified according to 50%, 60%, 70%, 80%, 90% and 100%.
10. A terminal machine for realizing a method for controlling the liquid level of a heater of a regenerative feedwater heating system of a thermal power plant is characterized by comprising the following steps:
the storage is used for storing a computer program and a liquid level control method of a heater of a feedwater heat recovery system of a thermal power plant;
a processor for executing the computer program and the method for controlling the heater level of the regenerative thermal system of the thermal power plant to realize the steps of the method for controlling the heater level of the regenerative thermal system of the thermal power plant as claimed in any one of claims 1 to 9.
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2021
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| CN2054234U (en) * | 1989-07-29 | 1990-03-07 | 徐尔骏 | Mixed-flow type computer controlled hydroelectric generator |
| JP2009127952A (en) * | 2007-11-26 | 2009-06-11 | Toshiba Corp | Drain control device of low pressure water supply heater and steam turbine plant |
| CN206145660U (en) * | 2016-10-27 | 2017-05-03 | 北京创时能源有限公司 | Hydrophobic water level regulating system of heating network heater |
| CN106765047A (en) * | 2017-01-11 | 2017-05-31 | 中国神华能源股份有限公司 | Water level regulation method and apparatus |
| CN110056858A (en) * | 2019-05-15 | 2019-07-26 | 贵州电网有限责任公司 | A kind of fired power generating unit Heater Terminal Temperature Difference adaptive regulation method and device |
| CN111911908A (en) * | 2020-06-17 | 2020-11-10 | 东南大学 | High-pressure heater water level fuzzy control mechanism and method for unit flexible peak regulation |
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