CN115263447B - Cold state preheating control system of gas-steam combined cycle unit - Google Patents
Cold state preheating control system of gas-steam combined cycle unit Download PDFInfo
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- CN115263447B CN115263447B CN202210924001.XA CN202210924001A CN115263447B CN 115263447 B CN115263447 B CN 115263447B CN 202210924001 A CN202210924001 A CN 202210924001A CN 115263447 B CN115263447 B CN 115263447B
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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
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The application provides a cold state preheating control system of a gas-steam combined cycle unit, which comprises the following components: the first preheating unit is used for determining whether the first preheating stage is finished according to the opening and closing conditions of the drain valve, the high-row check valve and the high-row ventilation valve of the heating cylinder; the second preheating unit is used for determining whether the second preheating stage is finished according to the opening and closing conditions of the low side valve, the high side valve, the middle side valve and the electric isolating valve of the steam turbine; the third preheating unit is used for determining whether the third preheating stage is finished according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the heating cylinder and the switching condition of the drain valve of the heating cylinder; the fourth preheating unit is used for determining whether the fourth preheating stage is finished according to the opening and closing conditions of the preheating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the heating cylinder steam pipeline, the rotation speed of the gas turbine and the rotation speed of the steam turbine; and the fifth preheating unit is used for determining whether the fifth preheating stage is finished according to the state of the steam turbine.
Description
Technical Field
The application relates to the field of intelligent control of a gas-steam combined cycle unit, in particular to a cold state preheating control system of a gas-steam combined cycle unit.
Background
In the cold start stage of the gas-steam combined cycle unit, a great deal of time is usually required to enable the unit to smoothly generate power and grid. The reason is that the steam turbine starts to start until the rotating speed rises to within 3000r/min, and the cylinder body of the steam turbine starts to perform cylinder warming, so that the following combined cycle mode can be performed.
The cold pre-heating pipeline is added on the side of the steam turbine, the goal of cold pre-heating is realized by utilizing temporary steam, and the pre-heating steam pipeline acts on the high-pressure cylinder and the medium-pressure cylinder of the steam turbine respectively. In this way, the turbine can be preheated in advance before the unit is ready to start. However, a scheme of controlling the cold pre-heating stage of the unit to ensure smooth start of the unit is not proposed in the related art.
Disclosure of Invention
In order to solve the problems, the application provides a cold state pre-heating control system of a gas-steam combined cycle unit.
According to one aspect of the application, a cold state preheating control system of a gas-steam combined cycle unit is provided and is applied to a coaxial gas-steam combined cycle unit, a high-pressure preheating steam pipeline and a medium-pressure preheating steam pipeline are additionally arranged on the turbine side of the coaxial gas-steam combined cycle unit, wherein the high-pressure preheating steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure preheating steam pipeline is directly communicated with the side of the medium-pressure cylinder, and a preheating valve group is arranged on each of the high-pressure preheating steam pipeline and the medium-pressure preheating steam pipeline; the system comprises:
the first preheating unit is used for determining whether the first preheating stage is finished according to the opening and closing conditions of the drain valve, the high-row check valve and the high-row ventilation valve of the heating cylinder;
the second preheating unit is used for determining whether the second preheating stage is finished according to the opening and closing conditions of the low side valve, the high side valve, the middle side valve and the electric isolating valve of the steam turbine after the first preheating stage is finished;
the third preheating unit is used for determining whether the third preheating stage is finished according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the heating cylinder and the switching condition of the drain valve of the heating cylinder after the second preheating stage is finished;
the fourth preheating unit is used for determining whether the fourth preheating stage is finished according to the opening and closing conditions of the preheating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the heating cylinder steam pipeline, the rotation speed of the gas turbine and the rotation speed of the steam turbine after the third preheating stage is finished;
and the fifth preheating unit is used for determining whether the fifth preheating stage is finished according to the state of the steam turbine after the fourth preheating stage is finished.
In some embodiments of the application, the first pre-heating unit comprises: the device comprises a switching value signal input module for fully opening a drain valve of a heating cylinder, a switching value signal input module for fully closing a high-row check valve, a switching value signal input module for fully closing a high-row ventilation valve, a switching value signal output module for completing a first preheating stage and a first AND module; wherein:
the switching value signal input module of the full opening of the drain valve of the heating cylinder, the switching value signal input module of the full closing of the high-row check valve and the switching value signal input module of the full closing of the high-row ventilation valve are connected with the input ends of the first and the second modules; the output end of the first AND module is connected with the switching value signal output module completed in the first preheating stage.
In some embodiments of the application, the second pre-heating unit comprises: the system comprises a low side valve fully-closed switching value signal input module, a high side valve fully-closed switching value signal input module, a middle side valve fully-closed switching value signal input module, a steam turbine electric isolation valve fully-closed switching value signal input module, a second preheating stage completed switching value signal output module and a second AND module; wherein:
the low-side valve fully-closed switching value signal input module, the Gao Bangfa fully-closed switching value signal input module, the middle-side valve fully-closed switching value signal input module and the steam turbine electric isolation valve fully-closed switching value signal input module are connected with the input ends of the second and module; and the switching value signal output module completed in the second preheating stage is connected with the output end of the second AND module.
As one possible implementation manner, the third preheating unit includes: the device comprises a switching value signal input module, a switching value signal output module, a first non-module, a second non-module and a third and module, wherein the main steam superheat degree is smaller than a superheat degree threshold value, the temperature and the pressure of a heating cylinder steam pipeline all meet preset conditions, the switching value signal input module is in a closing state of a heating cylinder drain valve, the switching value signal input module is in an opening state of the heating cylinder drain valve, the switching value signal output module is completed in a third preheating stage; wherein:
the switching value signal input module with the main steam superheat degree smaller than the superheat degree threshold value is connected with the input end of the first non-module; the switching value signal input module of the closing state of the drain valve of the heating cylinder is connected with the second non-module; the output end of the first non-module, the output end of the second non-module, the switching value signal input module of the heating cylinder steam pipeline temperature and pressure all meet the preset conditions, and the switching value signal input module of the heating cylinder drain valve in the open state are connected with the input ends of the third and the modules; and the output end of the third AND module is connected with the switching value signal output module completed in the third preheating stage.
As another possible implementation manner, the third preheating unit further includes: the device comprises a switching value signal input module for pre-heating a fifth-stage instruction, a switching value signal input module for temperature of a heating cylinder steam pipeline, a switching value signal input module for pressure of the heating cylinder steam pipeline, a fourth AND module, a fifth AND module and a first or module; wherein:
the switching value signal input module of the pre-heating fifth-stage instruction and the switching value signal input module of the temperature of the heating cylinder steam pipeline are connected with the input ends of the fourth and the fourth modules; the switching value signal input module of the pre-heating fifth-stage instruction and the switching value signal input module of the pressure of the steam pipeline of the heating cylinder are connected with the input ends of the fifth and module; the output end of the fourth and modules, the output end of the fifth and modules and the switching value signal input module with the main steam superheat degree smaller than the superheat degree threshold value are all connected with the input end of the first or module; the output end of the first or module is connected with the input end of the first non-module.
In some embodiments of the application, the fourth pre-heating unit comprises: the system comprises a switching value signal input module for fully opening a pre-heating medium-pressure butterfly valve, a switching value input module for fully opening a medium-pressure regulating valve, a switching value signal input module for fully opening a high-pressure gate valve, a switching value signal input module for enabling the temperature and the pressure of a heating cylinder steam pipeline to meet preset conditions, an analog signal input module for the rotating speed of a fuel engine, an analog signal input module for the rotating speed of a steam turbine, a switching value signal output module for completing the pre-heating in a fourth stage, a sixth and module, a seventh and module, an eighth and module, a first comparison and greater than module and a second comparison and greater than module; wherein:
the switching value signal input module of the full-open of the preheating medium-pressure butterfly valve, the switching value input module of the full-open of the medium-pressure regulating valve and the switching value signal input module of the full-open of the high-pressure gate valve are all connected with the input ends of the sixth and the modules; the analog signal input module of the rotating speed of the gas turbine is connected with the input end of the first comparison module; the analog quantity signal input module of the rotating speed of the steam turbine is connected with the input end of the second comparison larger module; the first comparison module and the second comparison module are connected with the input ends of the seventh module and the seventh module; the output end of the sixth and the modules, the switching value signal input module of which the temperature and the pressure of the heating cylinder steam pipeline meet preset conditions, and the output end of the seventh and the modules are connected with the input end of the eighth and the modules; and the output end of the eighth AND module is connected with the switching value signal output module after the fourth stage preheating is finished.
In other embodiments of the present application, the fourth preheating unit further includes: and the switching value signal input module of the fourth pre-heating stage manual confirmation button is also connected with the input end of the eighth and module.
As one possible implementation manner, the fifth preheating unit includes: the switching value signal input module of the steam turbine in-order control start ready and the switching value signal output module of the fifth preheating stage are connected.
According to the technical scheme, the cold state preheating control system of the gas-steam combined cycle unit is used for preheating the steam turbine in advance, so that the conventional preheating time of the unit is reduced, and the aims of saving energy and improving efficiency can be achieved. The system carries out full-automatic intelligent control on the whole preheating process through the plurality of preheating units, so that the problems of system faults and signal jump change can be avoided, and the smooth starting of the unit can be ensured.
Additional aspects and advantages of the 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 application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of a cold state pre-heating control system of a gas-steam combined cycle unit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a cold state pre-heating structure of a turbine of a coaxial gas-steam combined cycle unit in an embodiment of the application;
FIG. 3 is a schematic diagram of a first preheating unit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a second preheating unit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a third preheating unit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a fourth pre-heating unit according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a fourth alternative pre-heating unit according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a fifth preheating unit according to an embodiment of the present application;
FIG. 9 is a schematic diagram of another third pre-heating unit according to an embodiment of the present application;
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
It should be noted that, in the cold start stage of the gas-steam combined cycle unit, a great deal of time is usually required to smoothly generate power and grid the unit. The reason is that the steam turbine starts to start until the rotating speed rises to within 3000r/min, and the cylinder body of the steam turbine starts to perform cylinder warming, so that the following combined cycle mode can be performed.
The cold pre-heating pipeline is added on the side of the steam turbine, the goal of cold pre-heating is realized by utilizing temporary steam, and the pre-heating steam pipeline acts on the high-pressure cylinder and the medium-pressure cylinder of the steam turbine respectively. In this way, the turbine can be preheated in advance before the unit is ready to start. However, a scheme of controlling the cold pre-heating stage of the unit to ensure smooth start of the unit is not proposed in the related art.
In order to solve the problems, the application provides a cold state pre-heating control system of a gas-steam combined cycle unit.
FIG. 1 is a block diagram of a cold state pre-heating control system of a gas-steam combined cycle unit according to an embodiment of the present application. It should be noted that, the cold state preheating control system of the gas-steam combined cycle unit of the embodiment of the application is applied to a coaxial gas-steam combined cycle unit, and a high-pressure preheating steam pipeline and a medium-pressure preheating steam pipeline are added on the turbine side of the coaxial gas-steam combined cycle unit, wherein the high-pressure preheating steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure preheating steam pipeline is directly communicated with the medium-pressure cylinder side, and a preheating valve group is installed on both the high-pressure preheating steam pipeline and the medium-pressure preheating steam pipeline. As shown in fig. 2, a high-pressure pre-heating steam pipeline 201 and a medium-pressure pre-heating steam pipeline 202 are added on the turbine side of the coaxial gas-steam combined cycle unit. The high-pressure pre-heating steam pipeline 201 is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure pre-heating steam pipeline 202 is directly communicated with the side of the medium-pressure cylinder, and the high-pressure pre-heating steam pipeline 201 and the medium-pressure pre-heating steam pipeline 202 are both provided with a pre-heating valve group. The high-pressure pre-heating steam pipeline 201 is provided with 2 pneumatic shutoff valves, and the medium-pressure pre-heating steam pipeline 202 is provided with 1 pneumatic shutoff valve and 1 starting shutoff regulating valve.
As shown in fig. 1, a cold state pre-heating control system of a gas-steam combined cycle unit according to an embodiment of the present application includes: a first pre-heating unit 101, a second pre-heating unit 102, a third pre-heating unit 103, a fourth pre-heating unit 104, and a fifth pre-heating unit 105.
Wherein, the first preheating unit 101 is configured to determine whether the first preheating stage is completed according to the opening and closing conditions of the drain valve, the high-row check valve and the high-row vent valve of the heating cylinder. And the second preheating unit 102 is configured to determine whether the second preheating stage is completed according to the opening and closing conditions of the low side valve, the high side valve, the medium side valve and the electric isolation valve of the steam turbine after the first preheating stage is completed. And the third preheating unit 103 is configured to determine whether the third preheating stage is completed according to the degree of superheat of the main steam, the temperature and pressure of the steam pipeline of the heating cylinder, and the on-off condition of the drain valve of the heating cylinder after the second preheating stage is completed. And the fourth preheating unit 104 is configured to determine whether the fourth preheating stage is completed according to the opening and closing conditions of the middle-pressure butterfly valve, the middle-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the cylinder steam pipeline, the rotation speed of the gas turbine and the rotation speed of the steam turbine after the third preheating stage is completed. And a fifth preheating unit 105 for determining whether the fifth preheating stage is completed according to the state of the steam turbine after the fourth preheating stage is completed.
In some embodiments of the application, after the cold pre-heating of the unit is started, command signals for controlling the drain valve of the heating cylinder to be fully opened, the high-row check valve to be fully closed and the high-row ventilation valve to be fully opened are sent out first, and after feedback signals corresponding to the command signals are received, the first pre-heating stage is determined to be completed.
Fig. 3 is a schematic structural diagram of a first preheating unit according to an embodiment of the present application. As shown in fig. 3, the first preheating unit includes: the device comprises a switching value signal input module 301 for fully opening a drain valve of a heating cylinder, a switching value signal input module 302 for fully closing a high-row check valve, a switching value signal input module 303 for fully opening a high-row ventilation valve, a switching value signal output module 304 for completing a first preheating stage and a first AND module 305. The switching value signal input module 301 of the full open of the drain valve of the heating cylinder, the switching value signal input module 302 of the full close of the high-row check valve and the switching value signal input module 303 of the full open of the high-row ventilation valve are connected with the input ends of the first and module 305; the output of the first and module 305 is connected to the switching value signal output module 304, which completes the first pre-heating stage.
That is, when the drain valve of the heating cylinder is in the fully opened state, the output signal of the switching value signal input module 301 of the drain valve of the heating cylinder is 1, when the check valve of the high bank is in the fully closed state, the output signal of the switching value signal input module 302 of the check valve of the high bank is 1, and when the vent valve of the high bank is in the fully opened state, the output signal of the switching value signal input module 303 of the vent valve of the high bank is 1, and then the first and module 305 outputs the signal 1 to the switching value signal output module 304 of the first preheating stage, that is, the first preheating stage is completed. If the switching value signal output by any of the modules is 0, the condition for completing the first preheating stage is not satisfied, and the related process and the equipment thereof need to be checked and processed until the condition for completing the first preheating stage is satisfied.
In some embodiments of the present application, after the first preheating stage is completed, the first preheating unit transmits a completion signal to the second preheating unit, and after the first preheating stage is completed, the second preheating unit initiates command signals for controlling the low side valve to be fully opened, the high side valve to be fully closed, the middle side valve to be fully closed, and the electric isolation valve of the steam turbine to be fully closed, waits for receiving feedback signals corresponding to the respective valves, and determines that the second preheating stage is completed after receiving the corresponding feedback signals.
As an embodiment, as shown in fig. 4, the second preheating unit may include: the system comprises a low side valve fully-closed switching value signal input module 401, a high side valve fully-closed switching value signal input module 402, a medium side valve fully-closed switching value signal input module 403, a steam turbine electric isolation valve fully-closed switching value signal input module 404, a second preheating stage completed switching value signal output module 405 and a second AND module 406. The low bypass valve fully-closed switching value signal input module 401, the high bypass valve fully-closed switching value signal input module 402, the middle bypass valve fully-closed switching value signal input module 403 and the turbine electric isolation valve fully-closed switching value signal input module 404 are all connected with the input end of the second AND module 406, and the switching value signal output module 405 completed in the second preheating stage is connected with the output end of the second AND module 406.
That is, when the low bypass valve is in the fully closed state, the switching value signal output from the low bypass valve fully closed switching value signal input module 401 is 1, when the high bypass valve is in the fully closed state, the switching value signal output from the high bypass valve fully closed switching value signal input module 402 is 1, when the medium bypass valve is in the fully closed state, the switching value signal output from the medium bypass valve fully closed switching value signal input module 403 is 1, when the turbine electric isolation valve is in the fully closed state, the switching value signal output from the turbine electric isolation valve fully closed switching value signal input module 404 is 1, and when the input signals are all 1, the switching value signal output from the second preheating stage is completed through the second and module 406. Thus, when the low side valve, the high side valve, the medium side valve and the turbine electric isolation valve are all in the closed state, the second pre-heating stage is completed. If the switching value signal output by any of the modules is 0, the condition for completing the second preheating stage is not satisfied, and the related process and equipment thereof need to be checked and processed until the condition for completing the second preheating stage is satisfied.
In some embodiments of the present application, after the second pre-warming stage is completed, the third pre-warming unit determines whether the third pre-warming stage is completed based on the degree of superheat of the main steam, the temperature and pressure of the cylinder steam line, and the on-off condition of the cylinder drain valve. For example, if the superheat degree of the main steam is greater than 56 ℃, and the temperature and pressure of the steam pipeline of the heating cylinder meet the preset conditions, and meanwhile, the drain valve of the heating cylinder is opened, it can be indicated that all parameters of the pre-heating steam meet the design requirements of cold pre-heating, namely, the third pre-heating stage is completed.
As one possible embodiment, as shown in fig. 5, the third preheating unit may include: the main steam superheat degree is smaller than the superheat degree threshold value, and the main steam superheat degree is smaller than the superheat degree threshold value. The switching value signal input module 501, in which the superheat degree of the main steam is smaller than the superheat degree threshold, is connected to the input end of the first non-module 506. The switching value signal input module 503 of the closing state of the cylinder trap is connected with the second non-module 507. The output end of the first non-module 506, the output end of the second non-module 507, the switching value signal input module 502 of the heating cylinder steam pipeline temperature and pressure which meet the preset conditions and the switching value signal input module 504 of the heating cylinder drain valve on state are connected with the input end of the third and module 508, and the output end of the third and module 508 is connected with the switching value signal output module 505 completed in the third preheating stage.
The on-off signal input module 502 for the temperature and the pressure of the heating cylinder steam pipeline meet the preset conditions monitors the temperature and the pressure of the high-pressure pre-heating steam pipeline 201 and the medium-pressure pre-heating steam pipeline 202 in fig. 2, and the temperature and the pressure of the two pipelines meet the preset conditions, so that the on-off signal input module 502 for the temperature and the pressure of the heating cylinder steam pipeline meet the preset conditions outputs a high level.
That is, when the superheat of the main steam is greater than or equal to the preset superheat threshold, the output signal of the first non-module 506 is 1. When the cylinder trap is in the on state, the switching value signal of the switching value signal input module 503 in the off state of the cylinder trap is 0, the output signal of the second non-module 507 is 1, and the switching value signal of the switching value signal input module 504 in the on state of the cylinder trap is 1. If the temperature and the pressure of the heating cylinder steam pipeline meet the preset conditions, the switching value signal input module 502 outputs a switching value signal of 1. Therefore, when the superheat degree of the main steam is greater than or equal to the superheat degree preset threshold value, the temperature and the pressure of the steam pipeline of the heating cylinder meet preset conditions, and meanwhile, when the drain valve of the heating cylinder is opened, the bacteriostasis of various parameters of the pre-heating steam can be indicated to meet the design requirement of cold pre-heating, so that the third pre-heating stage is completed. If the switching value signal output from any of the modules connected to the input of the third and module 508 is 0, the condition for completion of the third pre-heating stage is not satisfied, and the related process and its equipment need to be checked and processed until the condition for completion of the third pre-heating stage is satisfied.
In some embodiments of the present application, after the third pre-warming stage is completed, the fourth pre-warming unit will determine whether the fourth pre-warming stage is completed according to the opening and closing conditions of the pre-warming medium pressure butterfly valve, the medium pressure regulating valve and the high pressure gate valve, and the temperature and pressure of the cylinder steam pipe, the speed of the gas turbine and the speed of the steam turbine. Specifically, the fourth preheating unit determines that the fourth preheating stage is completed when the preheating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve are already opened, the temperature and the pressure of the heating cylinder steam pipeline both meet preset conditions, and the rotation speed of the combustion engine and the rotation speed of the steam turbine both meet respective set values.
As one possible embodiment, as shown in fig. 6, the fourth preheating unit may include: the device comprises a switching value signal input module 601 for fully opening a pre-heating medium-pressure butterfly valve, a switching value input module 602 for fully opening a medium-pressure regulating valve, a switching value signal input module 603 for fully opening a high-pressure gate valve, a switching value signal input module 604 for enabling the temperature and the pressure of a heating cylinder steam pipeline to meet preset conditions, an analog signal input module 605 for the rotation speed of a combustion engine, an analog signal input module 606 for the rotation speed of a steam turbine, a switching value signal output module 607 for completing the pre-heating in a fourth stage, a sixth and module 608, a seventh and module 609, an eighth and module 610, a first comparison and greater module 611 and a second comparison and greater module 612.
The switching value signal input module 601 of the full-open pre-heating medium-pressure butterfly valve, the switching value input module 602 of the full-open medium-pressure regulating valve and the switching value signal input module 603 of the full-open high-pressure gate valve are all connected with the input ends of the sixth AND module 608. The analog signal input module 605 of the engine speed is connected to the input of the first comparison module 611. The analog signal input module 606 of the turbine speed is connected to the input of the second comparison greater than module 612. The first comparison and amplification module 611 and the second comparison and amplification module 612 are connected to the input of the seventh and amplification module 609. The output end of the sixth and module 608, the switch value signal input module 604, and the output end of the seventh and module 609 are connected with the input end of the eighth and module 610, wherein the temperature and the pressure of the heating cylinder steam pipeline meet preset conditions. The output of the eighth and module 610 is connected to the switching value signal output module 607 that completes the fourth stage of preheating.
That is, when the pre-heating medium-pressure butterfly valve is in the fully opened state, the switching value signal output from the switching value signal input module 601 for fully opening the pre-heating medium-pressure butterfly valve is 1. When the medium pressure regulating valve is in a full-open state, the switching value signal output by the switching value input module 602 of the medium pressure regulating valve is 1. When the high-pressure gate valve is in the fully open state, the switching value signal output from the switching value signal input module 603 for fully opening the high-pressure gate valve is 1, and in this case, the output signal from the sixth and module 608 is 1.
The first comparison and comparison module 611 is used for presetting a threshold value of the engine speed, for example, the engine speed threshold value is 600r/min, and when the output value of the analog signal input module 605 of the engine speed is greater than 600r/min, the output signal of the first comparison and comparison module 611 is 1. The second comparison is greater than the preset turbine speed threshold in the module 612, for example, the turbine speed threshold is 15r/min, and when the output value of the analog signal input module 606 of the turbine speed is greater than 15r/min, the output signal of the second comparison greater than module 612 is 1. In this way, it is possible to determine that the fourth pre-heating stage has been completed when the fourth pre-heating unit will have opened the medium pressure butterfly valve, the medium pressure regulating valve, the high pressure gate valve in the pre-heating, and the temperature and pressure of the cylinder steam line have both met the preset conditions, while the rotation speed of the combustion engine and the rotation speed of the steam turbine have both met the respective set values. If the output signal of any module connected to the input of the eighth and module 610 is 0, the completion condition of the fourth pre-heating stage is not satisfied, and the related signal and its equipment need to be checked and processed until the completion condition of the fourth pre-heating stage is satisfied.
As another possible embodiment, as shown in fig. 7, the fourth preheating unit may further include: the switching value signal input module 701 of the fourth pre-heating stage manual confirmation button is also connected to the input end of the eighth and module 610, and the connection manner of other modules is identical to that in fig. 6, and is not described herein. The switching value signal input module 701 of the manual confirmation button in the fourth preheating stage is introduced, which is equivalent to adding the manual confirmation link in the fourth preheating stage, so that the occurrence of the problems of equipment abnormality and the like can be avoided through the inspection and confirmation of related staff, and the smooth starting of the unit is further ensured.
In some embodiments of the present application, after the fourth pre-warming stage is completed, the fifth pre-warming unit will determine whether the fifth pre-warming stage is completed according to the state of the steam turbine. When the turbine is started and the sequential control is ready, the fifth preheating unit determines that the fifth preheating stage is completed, which is equivalent to the goal of cold preheating.
As one possible embodiment, as shown in fig. 8, the fifth preheating unit may include: the switching value signal input module 801 of the steam turbine in-order control and start readiness and the switching value signal output module 802 of the fifth preheating stage completion are connected, and the switching value signal input module 801 of the steam turbine in-order control and start readiness is connected with the switching value signal output module 802 of the fifth preheating stage completion.
That is, when the steam turbine is ready for sequential control start, the switching value signal output by the switching value signal input module 801 of the ready for sequential control start of the steam turbine is 1, which proves that the preheating steam is completely warmed up at the moment, the steam turbine is already provided with the start-up warmup, and the cold preheating control process is smoothly ended.
In other embodiments of the present application, in combination with the fifth preheating unit, in practical power plant applications, in order to avoid false triggering of the fifth preheating stage, the third preheating unit may further add logic for excluding false triggering of the fifth preheating stage on the basis of the structure shown in fig. 5. As shown in fig. 9, the third preheating unit may further include, on the basis of fig. 5: a switching value signal input module 901 for pre-warming a fifth stage instruction, a switching value signal input module 902 for a temperature of a warm cylinder steam pipe, a switching value signal input module 903 for a pressure of the warm cylinder steam pipe, a fourth and module 904, a fifth and module 905, and a first or module 906.
The switching value signal input module 901 for pre-heating the fifth-stage command and the switching value signal input module 902 for pre-heating the temperature of the cylinder steam pipeline are connected with the input ends of the fourth and module 904. The switching value signal input module 901 for the pre-heating fifth stage command and the switching value signal input module 903 for the pressure of the warm cylinder steam pipeline are connected with the input ends of the fifth and module 905. The output of the fourth and module 904, the output of the fifth and module 905 and the on-off signal input module 501, whose main steam superheat is less than the superheat threshold, are all connected to the input of the first or module 906. The output of the first or module 906 is connected to the input of the first non-module 506. When the pre-heating fifth stage is completed, the switching value signal output by the switching value signal input module 901 of the pre-heating fifth stage instruction is 1. When the temperature of the heating cylinder steam pipeline reaches the preset condition corresponding to the temperature, the output switching value signal of the switching value signal input module 902 of the temperature of the heating cylinder steam pipeline is 1, when the pressure of the heating cylinder steam pipeline reaches the preset condition corresponding to the pressure, the switching value signal output by the switching value signal input module 903 of the pressure of the heating cylinder steam pipeline is 1, and the preset conditions of the temperature and the pressure corresponding to the switching value signal input module 902 of the temperature of the heating cylinder steam pipeline and the switching value signal input module 903 of the pressure of the heating cylinder steam pipeline are consistent with the preset conditions of the switching value signal input module 502 that the temperature and the pressure of the heating cylinder steam pipeline meet the preset conditions.
That is, the third preheating unit confirms that the third preheating stage is completed only when the main steam superheat degree is greater than or equal to the preset superheat degree threshold value and the temperature and pressure of the cylinder steam pipe meet the preset conditions and the cylinder drain valve has been opened, as long as the third preheating stage is not completed in the fifth preheating stage.
According to the cold state preheating control system of the gas-steam combined cycle unit, disclosed by the embodiment of the application, the steam turbine is preheated in advance by the cold state preheating control system of the gas-steam combined cycle unit, so that the conventional preheating time of the unit is reduced, and the aims of saving energy and improving efficiency can be achieved. The system carries out full-automatic intelligent control on the whole preheating process through the plurality of preheating units, so that the problems of system faults and signal jump change can be avoided, and the smooth starting of the unit can be ensured.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. The cold state preheating control system of the gas-steam combined cycle unit is characterized by being applied to a coaxial gas-steam combined cycle unit, wherein a high-pressure preheating steam pipeline and a medium-pressure preheating steam pipeline are additionally arranged on the turbine side of the coaxial gas-steam combined cycle unit, the high-pressure preheating steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure preheating steam pipeline is directly communicated with the side of the medium-pressure cylinder, and a preheating valve group is arranged on the high-pressure preheating steam pipeline and the medium-pressure preheating steam pipeline; the system comprises:
the first preheating unit is used for determining whether the first preheating stage is finished according to the opening and closing conditions of the drain valve, the high-row check valve and the high-row ventilation valve of the heating cylinder;
the second preheating unit is used for determining whether the second preheating stage is finished according to the opening and closing conditions of the low side valve, the high side valve, the middle side valve and the electric isolating valve of the steam turbine after the first preheating stage is finished;
the third preheating unit is used for determining whether the third preheating stage is finished according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the heating cylinder and the switching condition of the drain valve of the heating cylinder after the second preheating stage is finished;
the fourth preheating unit is used for determining whether the fourth preheating stage is finished according to the opening and closing conditions of the preheating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the heating cylinder steam pipeline, the rotation speed of the gas turbine and the rotation speed of the steam turbine after the third preheating stage is finished;
and the fifth preheating unit is used for determining whether the fifth preheating stage is finished according to the state of the steam turbine after the fourth preheating stage is finished, wherein the fifth preheating unit determines that the fifth preheating stage is finished when the steam turbine is ready for start-up sequential control.
2. The system of claim 1, wherein the first pre-warming unit comprises: the device comprises a switching value signal input module for fully opening a drain valve of a heating cylinder, a switching value signal input module for fully closing a high-row check valve, a switching value signal input module for fully opening a high-row vent valve, a switching value signal output module for completing a first preheating stage and a first AND module; wherein:
the switching value signal input module of the full-open drain valve of the heating cylinder, the switching value signal input module of the full-closed high-row check valve and the switching value signal input module of the full-open high-row ventilation valve are connected with the input ends of the first and the second modules; the output end of the first AND module is connected with the switching value signal output module completed in the first preheating stage.
3. The system of claim 1, wherein the second pre-warming unit comprises: the system comprises a low side valve fully-closed switching value signal input module, a high side valve fully-closed switching value signal input module, a middle side valve fully-closed switching value signal input module, a steam turbine electric isolation valve fully-closed switching value signal input module, a second preheating stage completed switching value signal output module and a second AND module; wherein:
the low-side valve fully-closed switching value signal input module, the Gao Bangfa fully-closed switching value signal input module, the middle-side valve fully-closed switching value signal input module and the steam turbine electric isolation valve fully-closed switching value signal input module are connected with the input ends of the second and module; and the switching value signal output module completed in the second preheating stage is connected with the output end of the second AND module.
4. The system of claim 1, wherein the third pre-warming unit comprises: the device comprises a switching value signal input module, a switching value signal output module, a first non-module, a second non-module and a third and module, wherein the main steam superheat degree is smaller than a superheat degree threshold value, the temperature and the pressure of a heating cylinder steam pipeline all meet preset conditions, the switching value signal input module is in a closing state of a heating cylinder drain valve, the switching value signal input module is in an opening state of the heating cylinder drain valve, the switching value signal output module is completed in a third preheating stage; wherein:
the switching value signal input module with the main steam superheat degree smaller than the superheat degree threshold value is connected with the input end of the first non-module; the switching value signal input module of the closing state of the drain valve of the heating cylinder is connected with the second non-module; the output end of the first non-module, the output end of the second non-module, the switching value signal input module of the heating cylinder steam pipeline temperature and pressure all meet the preset conditions, and the switching value signal input module of the heating cylinder drain valve in the open state are connected with the input ends of the third and the modules; and the output end of the third AND module is connected with the switching value signal output module completed in the third preheating stage.
5. The system of claim 4, the third pre-warming unit further comprising: the device comprises a switching value signal input module for pre-heating a fifth-stage instruction, a switching value signal input module for temperature of a heating cylinder steam pipeline, a switching value signal input module for pressure of the heating cylinder steam pipeline, a fourth AND module, a fifth AND module and a first or module; wherein:
the switching value signal input module of the pre-heating fifth-stage instruction and the switching value signal input module of the temperature of the heating cylinder steam pipeline are connected with the input ends of the fourth and the fourth modules; the switching value signal input module of the pre-heating fifth-stage instruction and the switching value signal input module of the pressure of the steam pipeline of the heating cylinder are connected with the input ends of the fifth and module; the output end of the fourth and modules, the output end of the fifth and modules and the switching value signal input module with the main steam superheat degree smaller than the superheat degree threshold value are all connected with the input end of the first or module; the output end of the first or module is connected with the input end of the first non-module.
6. The system of claim 1, wherein the fourth pre-warming unit comprises: the system comprises a switching value signal input module for fully opening a pre-heating medium-pressure butterfly valve, a switching value input module for fully opening a medium-pressure regulating valve, a switching value signal input module for fully opening a high-pressure gate valve, a switching value signal input module for enabling the temperature and the pressure of a heating cylinder steam pipeline to meet preset conditions, an analog signal input module for the rotating speed of a fuel engine, an analog signal input module for the rotating speed of a steam turbine, a switching value signal output module for completing the pre-heating in a fourth stage, a sixth and module, a seventh and module, an eighth and module, a first comparison and a second comparison and big module; wherein:
the switching value signal input module of the full-open of the preheating medium-pressure butterfly valve, the switching value input module of the full-open of the medium-pressure regulating valve and the switching value signal input module of the full-open of the high-pressure gate valve are all connected with the input ends of the sixth and the modules; the analog signal input module of the rotating speed of the gas turbine is connected with the input end of the first comparison module; the analog quantity signal input module of the rotating speed of the steam turbine is connected with the input end of the second comparison larger module; the first comparison module and the second comparison module are connected with the input ends of the seventh module and the seventh module; the output end of the sixth and the modules, the switching value signal input module of which the temperature and the pressure of the heating cylinder steam pipeline meet preset conditions, and the output end of the seventh and the modules are connected with the input end of the eighth and the modules; and the output end of the eighth AND module is connected with the switching value signal output module after the fourth stage preheating is finished.
7. The system of claim 6, wherein the fourth pre-warming unit further comprises: and the switching value signal input module of the fourth pre-heating stage manual confirmation button is also connected with the input end of the eighth and module.
8. The system of claim 1, wherein the fifth pre-warming unit comprises: the switching value signal input module of the steam turbine in-order control start ready and the switching value signal output module of the fifth preheating stage are connected.
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