CN114542222A - Control system and method for nuclear energy steam extraction and heat supply - Google Patents
Control system and method for nuclear energy steam extraction and heat supply Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims description 20
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
The application relates to a control system and a method for nuclear energy steam extraction and heat supply, wherein the control system for nuclear energy steam extraction and heat supply comprises: the system comprises a primary pressure detection device, a high discharge pressure detection device, a heat supply flow detection device, an acquisition module, an instruction generation module and an instruction output module; and generating action instructions of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the device and the module, and then controlling the field equipment based on the action instructions. The technical scheme provided by the invention can effectively reduce the disturbance of high exhaust pressure in the operation process of the unit, reduce the safety risk of the transient working condition operation of the steam turbine and improve the stability and the safety of the operation of the nuclear power steam extraction and heat supply unit.
Description
Technical Field
The application relates to the technical field of nuclear energy heat supply, in particular to a control system and method for nuclear energy steam extraction and heat supply.
Background
At present, a central heating system is generally adopted in a city, and heating energy is mainly fossil energy, so that the influence of the emission of carbon oxides on the environment is difficult to avoid. Nuclear energy is used as a clean, efficient and stable energy source and can provide continuous heat for users, and the nuclear energy heat supply is gradually becoming another energy supply type of the nuclear energy.
The current nuclear power plant extraction and heat supply system generally realizes the adjustment of extraction and heat supply parameters by manually operating an extraction quick-closing regulating valve (FCV), and then the change of the exhaust pressure of a high-pressure cylinder of a steam turbine (hereinafter referred to as high exhaust pressure) caused by the change of the extraction amount is completed by automatically regulating an inlet steam regulating valve (ICV) of a low-pressure cylinder of the steam turbine through a control device, so that the control mode has certain defects, on one hand, the number of ICV valves is large (three low-pressure cylinders of the steam turbine have 6 ICV valves), and the 6 high-capacity valves are simultaneously operated to regulate the high exhaust pressure under the heat supply working condition, so that the valve opening is relatively small, the regulation characteristic is poor, and frequent valve actions can cause the risk of abrasion of an ICV mechanical sliding part; on the other hand, an MSR (steam-water separator reheater) is arranged between the ICV valve and the high exhaust pressure sampling point, the distance is far away, and the change from the valve action to the high exhaust pressure has large delay, so that the regulation and the control are not facilitated. Both of these problems are prone to high discharge pressure disturbances, particularly in transient operation of the turbine, which can present a safety risk to the operation of the turbine.
Disclosure of Invention
The application provides a control system and a control method for nuclear energy steam extraction and heat supply, which at least solve the technical problem that the regulation in the related technology has high discharge pressure disturbance caused by time delay and poor regulation characteristics, and brings safety risk to the operation of a steam turbine.
An embodiment of a first aspect of the present application provides a control system for nuclear energy extraction and heat supply, including: the system comprises a primary pressure detection device, a high discharge pressure detection device, a heat supply flow detection device, an acquisition module, an instruction generation module and an instruction output module;
the primary pressure detection device is used for detecting the primary pressure of the steam turbine to obtain a primary pressure signal;
the high exhaust pressure detection device is used for detecting the exhaust pressure of the high pressure cylinder of the steam turbine to obtain an exhaust pressure signal;
the heat supply flow detection device is used for detecting the steam extraction heat supply flow to obtain a steam extraction heat supply flow signal;
the acquisition module is used for acquiring the detected first-stage pressure signal, the detected exhaust steam pressure signal and the detected steam extraction and heat supply flow signal, and sending the acquired first-stage pressure signal, the acquired exhaust steam pressure signal and the detected steam extraction and heat supply flow signal to the instruction generation module;
the instruction generating module is used for receiving the first-stage pressure signal, the steam exhaust pressure signal and the steam extraction and heat supply flow signal sent by the acquisition module, generating action instructions of a steam extraction quick-closing regulating valve and a steam turbine low-pressure cylinder steam inlet regulating valve based on the first-stage pressure signal, the steam exhaust pressure signal and the steam extraction and heat supply flow signal, and sending the action instructions to the instruction output module;
and the instruction output module is used for receiving the action instruction from the instruction generation module and sending the action instruction to the field device for control.
The embodiment of the second aspect of the present application provides a control method for nuclear energy steam extraction and heat supply, including:
acquiring a detected first-stage pressure signal of the steam turbine, a detected exhaust pressure signal and an exhaust heat supply flow signal of a high-pressure cylinder of the steam turbine, an exhaust heat supply flow fixed value corresponding to a heat supply network load demand, and a preset high exhaust pressure fixed value according to a design requirement of the steam turbine;
determining the deviation of the steam extraction heat supply flow signal and the steam extraction heat supply flow fixed value by respectively using the steam extraction heat supply flow fixed value and the steam extraction heat supply flow signal, and determining the deviation of the steam exhaust pressure signal and the high exhaust pressure fixed value by using the high exhaust pressure fixed value and the steam exhaust pressure signal of the high-pressure cylinder of the steam turbine;
and controlling the steam inlet regulating valve and the steam extraction quick-closing regulating valve of the low-pressure cylinder of the steam turbine respectively based on the deviation.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the application provides a control system and a method for nuclear energy steam extraction and heat supply, wherein the system comprises: the system comprises a primary pressure detection device 1, a high discharge pressure detection device 2, a heat supply flow detection device 3, an acquisition module 4, an instruction generation module 5 and an instruction output module 6; and generating action instructions of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the device and the module, and then controlling the field equipment based on the action instructions. The technical scheme provided by the invention can effectively reduce the disturbance of high exhaust pressure in the operation process of the unit, reduce the safety risk of the transient working condition operation of the steam turbine and improve the stability and the safety of the operation of the nuclear power steam extraction and heat supply unit.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a nuclear extraction and heating control system according to one embodiment of the present application;
FIG. 2 is another block diagram of a nuclear extraction and heating control system according to an embodiment of the present application;
fig. 3 is a first structural diagram of an instruction generation module in a control system for nuclear power extraction and heating according to an embodiment of the present application;
fig. 4 is a second structural diagram of an instruction generation module in a control system for nuclear power extraction and heating according to an embodiment of the present application;
FIG. 5 is a third block diagram of an instruction generating module in a nuclear power extraction and heating control system according to an embodiment of the present disclosure;
fig. 6 is a fourth structural diagram of an instruction generation module in a control system for nuclear extraction and heating according to an embodiment of the present application;
FIG. 7 is a detailed functional block diagram of the interior of an instruction generation module in a control system for nuclear power extraction and heating according to an embodiment of the present application;
FIG. 8 is a flow chart of a method for controlling nuclear extraction heating according to an embodiment of the present application;
description of reference numerals:
the system comprises a primary pressure detection device 1, a high exhaust pressure detection device 2, a heat supply flow detection device 3, an acquisition module 4, an instruction generation module 5, an instruction output module 6, a man-machine interaction module 7, a high exhaust pressure fixed value module 5-1, a high exhaust pressure adjusting module 5-2, a first manual/automatic operation module 5-3, an ultra-late switching control module 5-4, a feedforward module 5-5, a first threshold value module 5-6, a second threshold value module 5-7, an ultra-late triggering module 5-8, an ultra-late processing module 5-9, a steam extraction flow fixed value determining module 5-10, a heat supply flow adjusting module 5-11, a second manual/automatic operation module 5-12 and a heat supply load compensation module 5-13.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The application provides a control system and a method for nuclear energy steam extraction and heat supply, the system comprises: the system comprises a primary pressure detection device 1, a high discharge pressure detection device 2, a heat supply flow detection device 3, an acquisition module 4, an instruction generation module 5 and an instruction output module 6; and generating action instructions of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the device and the module, and then controlling the field equipment based on the action instructions. The technical scheme provided by the invention can effectively reduce the disturbance of high exhaust pressure in the operation process of the unit and the safety risk brought to the operation of the steam turbine, and improve the stability and the safety of the operation of the steam extraction and heat supply unit.
The following describes a control system and method for nuclear power extraction and heating according to an embodiment of the present application with reference to the drawings.
Example one
Fig. 1 is a structural diagram of a control system for nuclear power steam extraction and heat supply according to an embodiment of the present disclosure, and as shown in fig. 1, the system includes: the system comprises a primary pressure detection device 1, a high discharge pressure detection device 2, a heat supply flow detection device 3, an acquisition module 4, an instruction generation module 5 and an instruction output module 6;
the primary pressure detection device 1 is used for detecting the primary pressure of the steam turbine to obtain a primary pressure signal;
the high exhaust pressure measuring device 2 is used for detecting the exhaust pressure of the high-pressure cylinder of the steam turbine to obtain an exhaust pressure signal;
the steam extraction heat supply flow measuring device 3 is used for detecting steam extraction heat supply flow to obtain a steam extraction heat supply flow signal;
the acquisition module 4 is configured to acquire the detected first-stage pressure signal, the detected exhaust steam pressure signal, and the detected exhaust steam heat supply flow signal, and send the acquired first-stage pressure signal, the acquired exhaust steam pressure signal, and the detected exhaust steam heat supply flow signal to the instruction generation module;
the instruction generating module 5 is configured to receive the first-stage pressure signal, the steam exhaust pressure signal, and the steam extraction and heat supply flow signal sent by the acquisition module, generate an action instruction of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the first-stage pressure signal, the steam exhaust pressure signal, and the steam extraction and heat supply flow signal, and send the action instruction to the instruction output module;
and the instruction output module 6 is used for receiving the action instruction from the instruction generation module and sending the action instruction to the field device for control.
In the embodiment of the present disclosure, as shown in fig. 2, the control system further includes: a human-computer interaction module 7;
the human-computer interaction module 7 is used for performing information interaction with the instruction generation module, and comprises: the core operation processing process includes manual operation, fixed value input, signal display, alarm processing, function switching and other related functions related to personnel operation and monitoring.
It should be noted that before generating the operating commands of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the first-stage pressure signal, the steam exhaust pressure signal and the steam extraction heat supply flow signal, the method further comprises:
preprocessing the received first-stage pressure signal, the received steam exhaust pressure signal and the received steam extraction and heat supply flow signal;
wherein the pre-processing comprises: the method comprises the steps of respectively carrying out three-out-two redundant processing on a first-stage pressure signal, an exhaust pressure signal and an extraction heat supply flow signal acquired by a plurality of channels, judging whether a range corresponding to an acquired signal exceeds a preset range or not and judging whether the value of the acquired signal is greater than a preset signal threshold or not, and sending an alarm signal to a human-computer interaction module 7 when the range corresponding to the acquired signal exceeds the preset range or the value of the acquired signal is greater than the preset signal threshold.
In the embodiment of the present disclosure, as shown in fig. 3, the instruction generating module 5 includes: the device comprises a high exhaust pressure fixed value module 5-1, a high exhaust pressure adjusting module 5-2, a first manual/automatic operation module 5-3 and an ultra-late switching control module 5-4;
the high exhaust pressure adjusting module 5-2 is used for receiving measured exhaust pressure of a high pressure cylinder of the steam turbine and an exhaust pressure fixed value sent by the high exhaust pressure fixed value module 5-1, determining the deviation of the measured exhaust pressure and the fixed value, then carrying out PID (proportion/integral/differential) operation according to the deviation to obtain an operation result, and sending the operation result to the first manual/automatic operation module 5-3 to manually or automatically adjust an FCV valve to control the exhaust pressure to be equal to the fixed value;
the ultra-late switching control module 5-4 is arranged between the first manual/automatic operation module 5-3 and the FCV valve and is used for protecting equipment in an emergency.
Further, as shown in fig. 4, the instruction generating module 5 further includes: the system comprises a feedforward module 5-5, a first threshold module 5-6, a second threshold module 5-7, an ultra-late triggering module 5-8 and an ultra-late processing module 5-9;
the feedforward module 5-5 is used for superposing an action signal of the ultra-late switching control module 5-4 corresponding to the pressure ratio calculation value on a command loop of the FCV valve, and the FCV valve can respond in advance when the pressure ratio is rapidly reduced;
the first threshold module 5-6 is used for comparing the ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset first threshold, and if the ratio is smaller than the threshold, the first threshold module 5-6 sends a signal for closing the FCV valve to the ultra-delay processing module 5-9 to realize the rapid closing of the FCV valve;
the second threshold module 5-7 is configured to compare a ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset second threshold, and if the ratio is smaller than the threshold, the second threshold module 5-7 sends a signal for closing the ICV valve to the steam extraction flow control module 5-11, so as to avoid causing a continuous decrease in the pressure ratio;
the ultra-delay processing module 5-9 is used for sending a control instruction to the ultra-delay switching control module 5-4 by the ultra-delay processing module 5-9 when receiving signals sent by the first threshold module 5-6 and the ultra-delay triggering module 5-8;
wherein the condition for triggering the ultra-late function comprises: heat supply exit, turbine trip, OPC (over speed protection control) action.
Further, as shown in fig. 5, the instruction generating module includes: the device comprises an extraction steam flow fixed value determining module 5-10, a heating flow adjusting module 5-11 and a second manual/automatic operation module 5-12;
the extraction flow fixed value determining module 5-10 calculates a flow fixed value preset according to the load requirement of the heat supply network or a fixed value given by an operator through the man-machine interaction module 7 to generate an actual flow fixed value, and sends the actual flow fixed value to the heat supply flow adjusting module 5-11;
the heat supply flow regulating module 5-11 is used for receiving the fixed value sent by the extraction flow fixed value determining module, determining the deviation between the detected extraction heat supply flow and the fixed value, performing PID (proportion integration differentiation) operation according to the deviation, and sending the operation result to the second manual/automatic operation module 5-12;
the second manual/automatic operation module 5-12 is used for generating an action command of an actual ICV valve according to the manual/automatic command and controlling the opening and closing of the ICV valve.
Further, as shown in fig. 6, the instruction generating module further includes: a compensation heat supply flow load module 5-13;
the compensation heat supply flow load modules 5-13 are used for calculating and generating control instructions and automatically increasing and decreasing the unit electric load while adjusting the heat supply amount under the condition of keeping the total load of the two loops unchanged;
the increase and decrease of the electric load are completed by the action of a turbine high-pressure regulating valve GV through a turbine controller.
The specific application of the system provided by the embodiment of the disclosure is explained based on the system, firstly, the first-stage pressure of the steam turbine is detected through the first-stage pressure detection device 1, the exhaust pressure of the high-pressure cylinder of the steam turbine is detected through the high exhaust pressure detection device 2, and the heat supply extraction flow is detected through the heat supply flow detection device 3; secondly, the detected data are collected by a collection module 4; then the instruction generating module 5 receives the signals sent by the acquisition module, carries out two-out-of-three redundancy processing, channel deviation fault alarming, interlocking, alarming, display processing of signal threshold values and the like on the first-stage pressure signals, the high exhaust pressure and the heat supply flow signals of the steam turbine, sends the signal processing results to the instruction generating module 5 and the human-computer interaction module 7, generates action instructions of the steam extraction quick-closing regulating valve FCV and the steam turbine low-pressure cylinder steam inlet regulating valve ICV by using the processed signals, sends information in the action instruction generating process to the human-computer interaction module 7, and sends the action instructions to the instruction output module 6; then the man-machine interaction module 7 receives and displays the processed signals sent by the instruction generation module 5 and information generated in the action instruction generation process; the instruction output module 6 receives the action instruction sent by the instruction generation module 5, sends the action instruction to the field device and the steam turbine controller, and can automatically increase and decrease the power load while adjusting and changing the heat supply so as to realize the heat-electricity linkage.
The instruction generating module 5 is configured to receive the signal sent by the acquiring module 4, and generate an action instruction of the steam extraction quick-closing regulating valve FCV and the steam turbine low-pressure cylinder steam inlet regulating valve ICV by using the processed signal, where the action instruction includes: as shown in fig. 7, fig. 7 is a detailed functional block diagram inside the instruction generating module 5, and describes the detailed relationship between the module 5 and the modules 4, 6, and 7. Referring to fig. 7, the module 5 undertakes a key operation processing task, specifically, a flow fixed value preset according to a heat supply network load requirement in the extraction flow fixed value determining module 5-10 or a fixed value given by an operation operator through the human-computer interaction module 7 is input into the heat supply flow adjusting module 5-11, an extraction heat supply flow signal from the acquisition module 4 is input into the heat supply flow adjusting module 5-11, the heat supply flow adjusting module 5-11 calculates a deviation between an actual heat supply flow and the 5-10 input fixed value, PID operation is performed according to the deviation, and an operation result is used as an action instruction of the ICV valve to control the on-off of the ICV. When the 5-12 module works in an automatic state, the 5-11 automatic operation result is directly sent to an adder to superpose the instruction (the value is 0 when a normal unit operates) of the steam turbine controller and then serve as an action instruction of the ICV valve, the action instruction is sent to an instruction output module 6, and the instruction output module 6 outputs an instruction to control the on-off of the ICV; when the 5-12 modules work in a manual state, a manual operation command from an operator can be used as an action command of an ICV valve to control the opening and closing of the ICV, wherein the generation of the heating steam extraction given value is determined according to an actual load demand curve of a heat network.
Further, the compensation heat supply flow load module 5-13 is used for calculating and generating a control instruction and automatically increasing and decreasing the unit electric load while adjusting the heat supply amount under the condition of keeping the total load of the two loops unchanged; the increase and decrease of the electrical load are completed by the action of a turbine high-pressure regulating valve GV through a turbine controller, specifically, an increase and decrease instruction of the electrical load output by the compensation heat supply flow load module 5-13 is sent to a turbine controller 8 through an instruction output module 6 to act a turbine high-pressure cylinder steam inlet regulating valve (GV)10, so that the adjustment of the electrical load of the unit is realized.
However, the opening and closing of the ICV valve causes a change in the high exhaust pressure which is recovered by the regulation of the FCV, which also effects the regulation of the heating steam flow.
Specifically, as shown in fig. 7, the instruction generating module 5 further includes: the device comprises a high exhaust pressure fixed value module 5-1, a high exhaust pressure adjusting module 5-2 and a first manual/automatic operation module 5-3;
the high exhaust pressure adjusting module 5-2 is used for receiving the exhaust pressure of the high pressure cylinder of the steam turbine obtained by detection and the exhaust pressure fixed value sent by the high exhaust pressure fixed value module 5-1, determining the deviation of the measured exhaust pressure and the fixed value, then carrying out PID operation according to the deviation to obtain an operation result, sending the operation result to the first manual/automatic operation module 5-3, and adjusting the FCV valve in a manual or automatic mode to control the exhaust pressure of the high pressure cylinder to be equal to the fixed value.
Further, as shown in fig. 7, the instruction generating module 5 further includes: an ultra-late switching control module 5-4;
the ultra-late switching control module 5-4 is arranged between the first manual/automatic operation module 5-3 and the FCV valve and is used for protecting equipment in an emergency.
Furthermore, the high discharge pressure parameter is important for the safety of the operation of the nuclear turbine, particularly the operation of the last stage blade, the invention also designs a pressure ratio (high discharge pressure/first stage pressure) logic loop besides considering normal regulation control, and the low pressure ratio (such as 0.16) protects and closes the quick-closing regulating valve so as to quickly cut off the steam extraction loop and prevent the pressure ratio from continuously deteriorating, thereby avoiding the damage to the high-pressure cylinder blade, particularly the last stage blade, and ensuring the operation safety of the turbine. As shown in fig. 7, the instruction generating module further includes: the system comprises a feedforward module 5-5, a first threshold module 5-6, a second threshold module 5-7, an ultra-late triggering module 5-8 and an ultra-late processing module 5-9; the feedforward module 5-5 superposes the action signal of the ultra-late switching control module 5-4 corresponding to the pressure ratio calculation value on a command loop of the FCV valve, and the FCV valve can respond in advance when the high exhaust pressure is rapidly reduced; the first threshold module 5-6 compares the ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset first threshold, and if the ratio is smaller than the threshold, the first threshold module 5-6 sends a signal for closing the FCV valve to the ultra-delay processing module 5-9 to realize the rapid closing of the FCV valve; the second threshold module 5-7 is used for comparing the ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset second threshold, and if the ratio is smaller than the threshold, the second threshold module 5-7 sends a signal for locking the ICV valve to the steam extraction flow control module 5-11, so that the pressure ratio is prevented from being continuously reduced, the blades of the high-pressure cylinder, particularly the blades of the last stage, are prevented from being damaged, and the operation safety of the steam turbine is ensured; when the ultra-late processing module 5-9 receives signals sent by the first threshold module 5-6 and the ultra-late triggering module 5-8, the ultra-late processing module 5-9 sends a control instruction to the ultra-late switching control module 5-4 to the instruction output module 6, and the instruction output module 6 outputs an instruction to control the fast closing of the FCV valve, wherein the condition for triggering the ultra-late function includes: heat supply withdrawal, turbine tripping and OPC action.
To sum up, the control system of nuclear energy extraction heating that this disclosed embodiment provided, the system includes: the system comprises a primary pressure detection device 1, a high discharge pressure detection device 2, a heat supply flow detection device 3, an acquisition module 4, an instruction generation module 5 and an instruction output module 6; and generating action instructions of the steam extraction quick-closing regulating valve and the steam inlet regulating valve of the low-pressure cylinder of the steam turbine based on the device and the module, and then controlling the field equipment based on the action instructions. The disturbance of high exhaust pressure in the unit operation process can be effectively reduced, the safety risk of the transient working condition operation of the steam turbine is reduced, and the stability and the safety of the nuclear power extraction and heat supply unit are improved.
Example two
Fig. 8 is a flowchart illustrating a method for controlling nuclear power extraction heating according to an embodiment of the present application, where as shown in fig. 8, the method may include:
step 1: acquiring a detected first-stage pressure signal of the steam turbine, a detected exhaust pressure signal of a high-pressure cylinder of the steam turbine, an extracted steam heat supply flow constant value corresponding to the extracted steam heat supply flow signal and the heat supply network load demand, and a preset high exhaust pressure constant value according to the design requirement of the steam turbine;
step 2: determining the deviation of the steam extraction heat supply flow signal and the steam extraction heat supply flow fixed value by respectively using the steam extraction heat supply flow fixed value and the steam extraction heat supply flow signal, and determining the deviation of the steam exhaust pressure signal and the high exhaust pressure fixed value by using the high exhaust pressure fixed value and the steam exhaust pressure signal of the high pressure cylinder of the steam turbine;
and step 3: and controlling the steam inlet regulating valve and the steam extraction quick-closing regulating valve of the low-pressure cylinder of the steam turbine respectively based on the deviation and the steam extraction heat supply flow signal.
In this disclosure, the control of the steam inlet regulating valve and the steam extraction quick-closing regulating valve of the low pressure cylinder of the steam turbine based on the deviation and the steam extraction heat supply flow signal respectively includes:
adjusting and controlling an inlet steam regulating valve ICV of a low pressure cylinder of the steam turbine based on the deviation between the steam extraction heat supply flow signal and the steam extraction heat supply flow fixed value;
and regulating and controlling the steam extraction quick-closing regulating valve FCV by using the deviation of the steam extraction pressure signal and the high steam extraction pressure fixed value.
In summary, the control method for nuclear energy extraction and heat supply provided by the embodiment of the disclosure can effectively reduce disturbance of high exhaust pressure and safety risk of operation of the steam turbine in the operation process of the unit, and improve stability and safety of operation of the extraction and heat supply unit.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A control system for nuclear energy steam extraction and heat supply is characterized by comprising: the system comprises a primary pressure detection device, a high discharge pressure detection device, a heat supply flow detection device, an acquisition module, an instruction generation module and an instruction output module;
the primary pressure detection device is used for detecting the primary pressure of the steam turbine to obtain a primary pressure signal;
the high exhaust pressure detection device is used for detecting the exhaust pressure of the high-pressure cylinder of the steam turbine to obtain an exhaust pressure signal;
the heat supply flow detection device is used for detecting the steam extraction heat supply flow to obtain a steam extraction heat supply flow signal;
the acquisition module is used for acquiring the detected first-stage pressure signal, the detected exhaust steam pressure signal and the detected steam extraction and heat supply flow signal, and sending the acquired first-stage pressure signal, the acquired exhaust steam pressure signal and the detected steam extraction and heat supply flow signal to the instruction generation module;
the instruction generating module is used for receiving the first-stage pressure signal, the steam exhaust pressure signal and the steam extraction and heat supply flow signal sent by the acquisition module, generating action instructions of a steam extraction quick-closing regulating valve and a steam turbine low-pressure cylinder steam inlet regulating valve based on the first-stage pressure signal, the steam exhaust pressure signal and the steam extraction and heat supply flow signal, and sending the action instructions to the instruction output module;
and the instruction output module is used for receiving the action instruction from the instruction generation module and sending the action instruction to the field device for control.
2. The nuclear powered extraction and heating control system of claim 1, further comprising: a human-computer interaction module;
the human-computer interaction module is used for carrying out information interaction with the instruction generation module;
wherein the information interaction comprises: manual operation, fixed value input, signal display, alarm processing and function switching in and out in the instruction generation process.
3. The system of claim 2, wherein the generating the command for the steam extraction quick-closing control valve and the steam turbine low pressure cylinder steam inlet control valve based on the first stage pressure signal, the steam exhaust pressure signal, and the steam extraction heat supply flow signal further comprises:
preprocessing the received first-stage pressure signal, the steam exhaust pressure signal and the steam extraction and heat supply flow signal;
wherein the pre-processing comprises: the method comprises the steps of respectively carrying out three-out-two redundant processing on a first-stage pressure signal, an exhaust pressure signal and an extraction heat supply flow signal acquired by a plurality of channels, judging whether a range corresponding to an acquired signal exceeds a preset range or not and judging whether the value of the acquired signal is greater than a preset signal threshold or not, and sending an alarm signal to a man-machine interaction module when the range corresponding to the acquired signal exceeds the preset range or the value of the acquired signal is greater than the preset signal threshold.
4. The system of claim 1, wherein the instruction generation module comprises: the device comprises a high exhaust pressure fixed value module, a high exhaust pressure adjusting module and a first manual/automatic operation module;
the high exhaust pressure adjusting module is used for receiving the measured exhaust pressure of the high pressure cylinder of the steam turbine and the exhaust pressure fixed value sent by the high exhaust pressure fixed value module, determining the detected exhaust pressure and the deviation of the fixed value, then carrying out PID operation according to the deviation to obtain an operation result, and sending the operation result to the first manual/automatic operation module to manually or automatically adjust the FCV valve to control the exhaust pressure to be equal to the fixed value.
5. The nuclear powered extraction and heating control system of claim 4, wherein the instruction generation module further comprises: an ultra-late switching control module;
the ultra-late switching control module is arranged between the first manual/automatic operation module and the FCV valve and is used for protecting equipment in emergency.
6. The system of claim 5, wherein the instruction generation module further comprises: the system comprises a feed-forward module, a first threshold module, a second threshold module, an ultra-late triggering module and an ultra-late processing module;
the feedforward module is used for superposing an action signal of the ultra-late switching control module corresponding to the pressure ratio calculation value on an instruction loop of the FCV valve, and the FCV valve can respond in advance when the pressure ratio is rapidly reduced;
the first threshold module is used for comparing the ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset first threshold, and if the ratio is smaller than the threshold, the first threshold module sends a signal for closing the FCV valve to the ultra-delay processing module to realize the quick closing of the FCV valve;
the second threshold module is used for comparing the ratio of the detected exhaust steam pressure of the high-pressure cylinder of the steam turbine to the detected first-stage pressure signal with a preset second threshold, and if the ratio is smaller than the threshold, the second threshold module sends a signal for locking the opening of the ICV valve to the steam extraction flow control module, so that the pressure ratio is prevented from being continuously reduced;
the ultra-late processing module is used for sending a control instruction to the ultra-late switching control module when receiving signals sent by the first threshold module and the ultra-late triggering module;
wherein the functional conditions of the ultra-late triggering module comprise: heat supply withdrawal, turbine tripping and OPC action.
7. The system of claim 1, wherein the instruction generation module comprises: the system comprises an extraction steam flow fixed value determining module, a heat supply flow adjusting module and a second manual/automatic operation module;
the steam extraction flow fixed value determining module is used for sending a flow fixed value preset according to the load requirement of the heat supply network or a fixed value given by an operator through the man-machine interaction module to the heat supply flow adjusting module;
the heat supply flow regulating module is used for receiving the fixed value sent by the steam extraction flow fixed value determining module, determining the deviation between the detected steam extraction heat supply flow and the fixed value, then carrying out PID operation according to the deviation, and sending the operation result to the second manual/automatic operation module;
and the second manual/automatic operation module is used for generating an action command of an actual ICV valve according to the manual/automatic command and controlling the opening and closing of the ICV valve.
8. The system of claim 1, wherein the instruction generation module further comprises: a compensation heat supply flow load module;
the compensation heat supply flow load module is used for calculating and generating a control instruction and automatically increasing and decreasing the unit electric load while adjusting the heat supply amount under the condition of keeping the total load of the two loops unchanged;
the increase and decrease of the electric load are completed by the action of a turbine high-pressure regulating valve GV through a turbine controller.
9. The nuclear power extraction heating control method of the nuclear power extraction heating control system according to any one of claims 1 to 8, comprising:
acquiring a detected first-stage pressure signal of the steam turbine, a detected exhaust pressure signal of a high-pressure cylinder of the steam turbine, an extracted steam heat supply flow signal and an extracted steam heat supply flow constant value corresponding to a heat supply network load demand, and acquiring a preset high exhaust pressure constant value according to the design requirement of the steam turbine;
determining the deviation of the steam extraction heat supply flow signal and the steam extraction heat supply flow fixed value by respectively using the steam extraction heat supply flow fixed value and the steam extraction heat supply flow signal, and determining the deviation of the steam exhaust pressure signal and the high exhaust pressure fixed value by using the high exhaust pressure fixed value and the steam exhaust pressure signal of the high-pressure cylinder of the steam turbine;
and controlling the steam inlet regulating valve and the steam extraction quick-closing regulating valve of the low-pressure cylinder of the steam turbine respectively based on the deviation and the steam extraction heat supply flow signal.
10. The method of claim 9, wherein said controlling the steam turbine low pressure cylinder admission control valve and the extraction quick-closing control valve based on said deviation and extraction heat flow signals, respectively, comprises:
regulating and controlling a steam inlet regulating valve of a low-pressure cylinder of the steam turbine based on the deviation between the steam extraction heat supply flow signal and the steam extraction heat supply flow fixed value;
and regulating and controlling the steam extraction quick-closing regulating valve by using the deviation of the steam extraction pressure signal and the high steam extraction pressure fixed value.
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