CN115263447A - Cold-state pre-warming control system of gas-steam combined cycle unit - Google Patents
Cold-state pre-warming control system of gas-steam combined cycle unit Download PDFInfo
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- CN115263447A CN115263447A CN202210924001.XA CN202210924001A CN115263447A CN 115263447 A CN115263447 A CN 115263447A CN 202210924001 A CN202210924001 A CN 202210924001A CN 115263447 A CN115263447 A CN 115263447A
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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 gas steam combined cycle unit's cold state warms up control system in advance includes: the first pre-warming unit is used for determining whether the first pre-warming stage is finished or not according to the switching conditions of the warm cylinder drain valve, the high-discharge check valve and the high-discharge ventilation valve; the second pre-warming unit is used for determining whether the second pre-warming stage is finished or not according to the switching conditions of the low side valve, the high side valve, the middle side valve and the steam turbine electric isolation valve; the third pre-heating unit is used for determining whether the third pre-heating stage is finished or not according to the superheat degree of the main steam, the temperature and the pressure of a steam pipeline of the cylinder heater and the switching condition of a drain valve of the cylinder heater; the fourth pre-warming unit is used for determining whether a fourth pre-warming stage is finished or not according to the switching conditions of the pre-warming medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the steam pipeline of the warming cylinder, the rotating speed of the gas turbine and the rotating speed of the steam turbine; and the fifth pre-warming unit is used for determining whether the fifth pre-warming stage is finished or not 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 pre-warming control system of the gas-steam combined cycle unit.
Background
In the cold-state starting stage of the gas-steam combined cycle unit, a large amount of time is usually needed for the unit to smoothly generate and grid. The reason is that the cylinder body of the steam turbine begins to warm up until the rotating speed rises to 3000r/min, so that the subsequent combined cycle mode can be carried out.
The cold-state pre-warming pipeline is added on the side of the steam turbine, the aim of cold-state pre-warming is achieved by utilizing the near-machine steam, and the pre-warming steam pipeline acts on a high-pressure cylinder and a medium-pressure cylinder of the steam turbine respectively. In this way, the turbine can be pre-warmed in advance before the unit is ready to be started. However, the related art does not provide a scheme for controlling the cold pre-warming stage of the unit to ensure the smooth start of the unit.
Disclosure of Invention
In order to solve the problems, the application provides a cold-state pre-warming control system of a gas-steam combined cycle unit.
According to one aspect of the application, a cold pre-warming control system of a gas-steam combined cycle unit is provided, and is applied to a coaxial gas-steam combined cycle unit, wherein a high-pressure pre-warming steam pipeline and a medium-pressure pre-warming steam pipeline are additionally arranged on the steam turbine side of the coaxial gas-steam combined cycle unit, the high-pressure pre-warming steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure pre-warming steam pipeline is directly communicated with the medium-pressure cylinder side, and pre-warming valve groups are respectively installed on the high-pressure pre-warming steam pipeline and the medium-pressure pre-warming steam pipeline; the system comprises:
the first pre-warming unit is used for determining whether a first pre-warming stage is finished or not according to the opening and closing conditions of the warm cylinder drain valve, the high-exhaust check valve and the high-exhaust ventilation valve;
the second pre-warming unit is used for determining whether the second pre-warming stage is finished or not according to the switching conditions of the low side valve, the high side valve, the middle side valve and the steam turbine electric isolating valve after the first pre-warming stage is finished;
the third pre-heating unit is used for determining whether the third pre-heating stage is finished or not according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the cylinder heater and the switching condition of the drain valve of the cylinder heater after the second pre-heating stage is finished;
the fourth pre-warming unit is used for determining whether the fourth pre-warming stage is finished or not according to the switching conditions of a pre-warming medium-pressure butterfly valve, a medium-pressure regulating valve and a high-pressure gate valve, the temperature and the pressure of the cylinder warming steam pipeline, the rotating speed of the gas turbine and the rotating speed of the steam turbine after the third pre-warming stage is finished;
and the fifth pre-warming unit is used for determining whether the fifth pre-warming stage is finished or not according to the state of the steam turbine after the fourth pre-warming stage is finished.
In some embodiments of the present application, the first pre-warming unit includes: the system comprises a switching value signal input module for fully opening a drain valve of a warm cylinder, a switching value signal input module for fully closing a high-discharge check valve, a switching value signal input module for fully closing a high-discharge ventilation valve, a switching value signal output module finished in a first pre-warming stage and a first AND module; wherein:
the switching value signal input module of the fully-opened cylinder warming drain valve, the switching value signal input module of the fully-closed high-exhaust check valve and the switching value signal input module of the fully-closed high-exhaust ventilation valve are connected with the input ends of the first and the second modules; and the output end of the first and module is connected with the switching value signal output module which finishes the first pre-warming stage.
In some embodiments of the present application, the second pre-warming unit includes: the system comprises a low bypass valve full-closed switching value signal input module, a high bypass valve full-closed switching value signal input module, a middle bypass valve full-closed switching value signal input module, a steam turbine electric isolation valve full-closed switching value signal input module, a switching value signal output module finished in a second pre-warming stage and a second AND module; wherein:
the low side valve fully-closed switching value signal input module, the high side valve fully-closed switching value signal input module, the middle side valve fully-closed switching value signal input module and the steam turbine electric isolating valve fully-closed switching value signal input module are connected with the input end of the second and module; and the switching value signal output module finished in the second pre-warming stage is connected with the output end of the second and module.
As a possible implementation, the third pre-warming unit includes: the system 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 superheat degree of main steam is smaller than a superheat degree threshold value, and the temperature and the pressure of a steam pipeline of a warm cylinder meet preset conditions; wherein:
the switching value signal input module of which the main steam superheat degree is less 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 off state of the warm cylinder drain valve 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 with the temperature and the pressure of the cylinder warming steam pipeline meeting preset conditions and the switching value signal input module with the open state of the cylinder warming drain valve are connected with the input end of the third and module; and the output end of the third and module is connected with the switching value signal output module finished in the third pre-warming stage.
As another possible implementation, the third pre-warming unit further includes: a switching value signal input module for pre-warming a fifth stage instruction, a switching value signal input module for warming the temperature of a cylinder steam pipeline, a switching value signal input module for warming the pressure of the 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-warming fifth stage instruction and the switching value signal input module of the warming cylinder steam pipeline temperature are connected with the input ends of the fourth and the fourth modules; the switching value signal input module of the pre-warming fifth stage instruction and the switching value signal input module of the warming cylinder steam pipeline pressure are connected with the input ends of the fifth and the module; the output end of the fourth and module, the output end of the fifth and module and the switching value signal input module of which the main steam superheat degree is less than the superheat degree threshold are connected with the input end of the first or module; and the output end of the first OR module is connected with the input end of the first non-module.
In some embodiments of the present application, the fourth pre-warming unit includes: the system comprises a pre-warming medium-pressure butterfly valve full-opening switching value signal input module, a medium-pressure regulating valve full-opening switching value input module, a high-pressure gate valve full-opening switching value signal input module, a warming cylinder steam pipeline switching value signal input module with temperature and pressure meeting preset conditions, a gas turbine rotating speed analog signal input module, a steam turbine rotating speed analog signal input module, a fourth-stage pre-warming completed switching value signal output module, a sixth and module, a seventh and module, an eighth and module, a first comparison larger module and a second comparison larger module; wherein:
the pre-warming medium-pressure butterfly valve fully-opened switching value signal input module, the medium-pressure regulating valve fully-opened switching value signal input module and the high-pressure gate valve fully-opened switching value signal input module are connected with the input end of the sixth and module; the analog signal input module of the rotating speed of the gas turbine is connected with the input end of the first larger-ratio 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 greater module and the second comparison greater module are both connected with the input end of the seventh comparison module; the output ends of the sixth and module and the switching value signal input module and the seventh and module, of which the temperature and the pressure of the cylinder warming steam pipeline meet preset conditions, are connected with the input end of the eighth and module; and the output end of the eighth and module is connected with the switching value signal output module which completes the pre-warming in the fourth stage.
In other embodiments of the present application, the fourth pre-warming unit further includes: and the switching value signal input module of the fourth pre-warming stage manual confirmation button is also connected with the input end of the eighth and module.
As a possible implementation, the fifth pre-warming unit includes: the system comprises a switching value signal input module for ready sequential control starting of the steam turbine and a switching value signal output module for finishing a fifth pre-warming stage, wherein the switching value signal input module for ready sequential control starting of the steam turbine is connected with the switching value signal output module for finishing the fifth pre-warming stage.
According to the technical scheme, the steam turbine is pre-warmed in advance through the cold-state pre-warming control system of the gas-steam combined cycle unit, the conventional pre-warming duration of the unit is shortened, and therefore the purposes of energy conservation and efficiency improvement can be achieved. The system performs full-automatic intelligent control on the whole pre-warming process through a plurality of pre-warming units, not only can avoid the occurrence of system faults and signal jump change problems, but also can ensure the smooth starting of the 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 cold pre-warming control system of a gas-steam combined cycle unit according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of cold pre-warming of a turbine of the coaxial gas-steam combined cycle unit in the embodiment of the application;
FIG. 3 is a schematic diagram of a first pre-warming unit in the embodiment of the present application;
FIG. 4 is a schematic diagram of a second pre-warming unit in the embodiment of the present application;
FIG. 5 is a schematic structural diagram of a third pre-warming unit in the embodiment of the present application;
FIG. 6 is a schematic diagram of a fourth pre-warming unit in the embodiment of the present application;
FIG. 7 is a schematic structural diagram of another fourth pre-warming unit in the embodiment of the present application;
FIG. 8 is a schematic structural diagram of a fifth pre-warming unit in the embodiment of the present application;
FIG. 9 is a schematic structural diagram of another third pre-warming unit in the embodiment of the present application;
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.
It should be noted that, in the cold start stage of the gas-steam combined cycle unit, a large amount of time is usually required to enable the unit to smoothly generate and grid the power. The reason is that the cylinder body of the steam turbine begins to warm up only when the rotating speed of the steam turbine rises to 3000r/min, so that the subsequent combined cycle mode can be carried out.
The cold-state pre-warming pipeline is added on the side of the steam turbine, the aim of cold-state pre-warming is achieved by utilizing the near-machine steam, and the pre-warming steam pipeline acts on a high-pressure cylinder and a medium-pressure cylinder of the steam turbine respectively. In this way, the turbine can be pre-warmed in advance before the unit is ready to start. However, the related art does not provide a scheme for controlling the cold pre-warming stage of the unit to ensure the smooth start of the unit.
In order to solve the problems, the application provides a cold-state pre-warming control system of a gas-steam combined cycle unit.
Fig. 1 is a block diagram of a cold pre-warming 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 pre-warming control system of the gas and steam combined cycle unit in the embodiment of the present application is applied to a coaxial gas and steam combined cycle unit, and a high-pressure pre-warming steam pipeline and a medium-pressure pre-warming steam pipeline are added to the steam turbine side of the coaxial gas and steam combined cycle unit, wherein the high-pressure pre-warming steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure pre-warming steam pipeline is directly communicated with the medium-pressure cylinder side, and pre-warming valve sets are installed on the high-pressure pre-warming steam pipeline and the medium-pressure pre-warming steam pipeline. As shown in FIG. 2, a high-pressure pre-warming steam pipeline 201 and an intermediate-pressure pre-warming steam pipeline 202 are added to the steam turbine side of the coaxial gas-steam combined cycle unit. Wherein, high pressure warms up steam conduit 201 in advance and is connected with the main steam conduit of high-pressure cylinder, and medium pressure warms up steam conduit 202 in advance and directly communicates with medium pressure cylinder side, and high pressure warms up steam conduit 201 in advance and medium pressure warms up steam conduit 202 in advance and all installs warm up the valves in advance. The high-pressure pre-warming steam pipeline 201 is provided with 2 pneumatic shutoff valves, and the medium-pressure pre-warming steam pipeline 202 is provided with 1 pneumatic shutoff valve and 1 starting shutoff regulating valve.
As shown in fig. 1, a cold pre-warming 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.
The first pre-warming unit 101 is configured to determine whether the first pre-warming stage is completed according to switching conditions of a warm cylinder drain valve, a high-discharge check valve and a high-discharge ventilation valve. And the second pre-warming unit 102 is used for determining whether the second pre-warming stage is finished or not according to the switching conditions of the low side valve, the high side valve, the middle side valve and the steam turbine electric isolation valve after the first pre-warming stage is finished. And the third pre-heating unit 103 is used for determining whether the third pre-heating stage is finished or not according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the cylinder heater and the switching condition of the drain valve of the cylinder heater after the second pre-heating stage is finished. And the fourth pre-warming unit 104 is used for determining whether the fourth pre-warming stage is finished or not according to the switching conditions of the pre-warming medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the steam pipeline of the warming cylinder, the rotating speed of the gas turbine and the rotating speed of the steam turbine after the third pre-warming stage is finished. And a fifth pre-warming unit 105 for determining whether the fifth pre-warming stage is completed according to the state of the turbine after the fourth pre-warming stage is completed.
In some embodiments of the application, after the cold pre-warming of the unit is started, command signals for controlling the full opening of the drain valve of the warming cylinder, the full closing of the high-exhaust check valve and the full opening of the high-exhaust ventilation valve are sent out, and after respective corresponding feedback signals are received, the completion of the first pre-warming stage is determined.
Fig. 3 is a schematic structural diagram of a first pre-warming unit in an embodiment of the present application. As shown in fig. 3, the first pre-warming unit includes: the control method comprises a switching value signal input module 301 for fully opening a drain valve of a warming cylinder, a switching value signal input module 302 for fully closing a high-exhaust check valve, a switching value signal input module 303 for fully opening a high-exhaust ventilation valve, a switching value signal output module 304 for completing a first pre-warming stage and a first and module 305. Wherein, the switching value signal input module 301 for fully opening the drain valve of the warm cylinder, the switching value signal input module 302 for fully closing the high-exhaust check valve and the switching value signal input module 303 for fully opening the high-exhaust ventilation valve are all connected with the input ends of the first and the second modules 305; the output of the first and module 305 is connected to the switching value signal output module 304 for completing the first pre-warming phase.
That is, when the warm-up steam trap is in the fully-open state, the output signal of the switching value signal input module 301 when the warm-up steam trap is fully-open is 1, when the high-discharge check valve is in the fully-closed state, the output signal of the switching value signal input module 302 when the high-discharge check valve is fully-closed is 1, when the high-discharge ventilation valve is in the fully-open state, the output signal of the switching value signal input module 303 when the high-discharge ventilation valve is fully-open is 1, and at this time, the first and module 305 outputs signal 1 to the switching value signal output module 304 when the first pre-warming stage is completed, that is, it is described that the first pre-warming stage is completed. If the switching value signal output by any module is 0, the condition that the first pre-warming stage is finished is not met, and related processes and equipment thereof need to be checked and processed until the condition that the first pre-warming stage is finished is met.
In some embodiments of the present application, after the first pre-warming stage is completed, the first pre-warming unit transmits a completion signal to the second pre-warming unit, and the second pre-warming unit initiates command signals for controlling the low side valve to be fully opened, the high side valve to be fully closed, the intermediate side valve to be fully closed, and the turbine electric isolation valve to be fully closed after the first pre-warming stage is completed, waits to receive feedback signals corresponding to the respective valves, and determines that the second pre-warming stage is completed after receiving the corresponding feedback signals.
As an embodiment, as shown in fig. 4, the second pre-warming unit may include: 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 middle side valve fully-closed switching value signal input module 403, a turbine electric isolation valve fully-closed switching value signal input module 404, a second pre-warming stage completed switching value signal output module 405 and a second AND module 406. The switching value signal input module 401 for fully closing the low bypass valve, the switching value signal input module 402 for fully closing the high bypass valve, the switching value signal input module 403 for fully closing the intermediate bypass valve and the switching value signal input module 404 for fully closing the electric isolation valve of the steam turbine are all connected with the input end of the second and module 406, and the switching value signal output module 405 for completing the second pre-warming stage is connected with the output end of the second and module 406.
That is, when the low side valve is in the fully closed state, the switching value signal output by the switching value signal input module 401 for fully closing the low side valve is 1, when the high side valve is in the fully closed state, the switching value signal output by the switching value signal input module 402 for fully closing the high side valve is 1, when the medium side valve is in the fully closed state, the switching value signal output by the switching value signal input module 403 for fully closing the medium side valve is 1, when the electric turbine isolation valve is in the fully closed state, the switching value signal output by the switching value signal input module 404 for fully closing the electric turbine isolation valve is 1, and when the input signals are all 1, the switching value signal output module for completing the second pre-warming stage outputs 1 through the second and module 406. Thus, the second pre-warm stage is completed when the low bypass valve, the high bypass valve, the intermediate bypass valve and the turbine electrical isolation valve are all in the closed state. If the switching value signal output by any module is 0, the condition of finishing the second pre-warming stage is not met, and related processes and equipment thereof need to be checked and processed until the condition of finishing the second pre-warming stage is met.
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 according to the main steam superheat degree, the temperature and the pressure of the cylinder-warming steam pipeline, and the switching condition of the cylinder-warming drain valve. For example, if the superheat degree of the main steam is greater than 56 ℃, the temperature and the pressure of the steam pipeline of the warm cylinder both meet preset conditions, and the drain valve of the warm cylinder is opened at the same time, it can be shown that various parameters of the pre-warming steam meet the design requirements of cold pre-warming, that is, the third pre-warming stage is completed.
As one possible embodiment, as shown in fig. 5, the third pre-warming unit may include: the control method comprises a switching value signal input module 501 with main steam superheat smaller than a superheat threshold, a switching value signal input module 502 with the temperature and pressure of a steam pipeline of a warm cylinder meeting preset conditions, a switching value signal input module 503 with a warm cylinder drain valve in an off state, a switching value signal input module 504 with a warm cylinder drain valve in an on state, a switching value signal output module 505 finished in a third pre-heating stage, a first non-module 506, a second non-module 507 and a third and module 508. The switching value signal input module 501 with the main steam superheat degree smaller than the superheat degree threshold value is connected with the input end of the first non-module 506. The on-off signal input module 503 for the warm cylinder trap off state is connected to 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 when the temperature and the pressure of the cylinder warming steam pipeline meet the preset conditions, and the switching value signal input module 504 when the cylinder warming drain valve is in the open 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 pre-warming stage.
The switching value signal input module 502 for which the temperature and the pressure of the cylinder warming steam pipeline both meet the preset conditions is used for monitoring the temperature and the pressure of the high-pressure pre-warming steam pipeline 201 and the medium-pressure pre-warming steam pipeline 202 in fig. 2, the temperature and the pressure of the two pipelines both meet the preset conditions, and then the switching value signal input module 502 for which the temperature and the pressure of the cylinder warming steam pipeline both meet the preset conditions outputs a high level.
That is, when the main steam superheat is greater than or equal to the preset superheat threshold, the output signal of the first non-module 506 is 1. When the cylinder-warming drain valve is in the open state, the switching value signal of the switching value signal input module 503 in the closed state of the cylinder-warming drain valve 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 open state of the cylinder-warming drain valve is 1. If the temperature and the pressure of the steam pipeline of the warm cylinder both meet the preset conditions, the switching value signal input module 502 that the temperature and the pressure of the steam pipeline of the warm cylinder both meet the preset conditions outputs a switching value signal of 1. Like this, when main steam superheat degree is greater than or equal to the predetermined threshold value of superheat degree, and warm jar steam conduit's temperature and pressure all satisfy the predetermined condition, when warm jar trap has been opened simultaneously, can show that each item parameter bacteriostasis of warm steam satisfies cold state design requirement of warming in advance to the third stage of warming in advance has been accomplished. If the switching value signal output by any one of the modules connected to the input terminals of the third and module 508 is 0, the condition for completing the third pre-warming stage is not satisfied, and the relevant processes and equipment thereof need to be checked and processed until the condition for completing the third pre-warming 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 steam pipeline of the warming cylinder, the rotation speed of the gas turbine and the rotation speed of the steam turbine. Specifically, the fourth pre-heating unit determines that the fourth pre-heating stage is completed when the pre-heating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve are opened, the temperature and the pressure of the steam pipeline of the cylinder heating meet preset conditions, and the rotating speed of the gas turbine and the rotating speed of the steam turbine meet respective set values.
As one possible embodiment, as shown in fig. 6, the fourth pre-warming unit may include: the system comprises a pre-warming medium-pressure butterfly valve full-opening switching value signal input module 601, a medium-pressure regulating valve full-opening switching value input module 602, a high-pressure gate valve full-opening switching value signal input module 603, a warming cylinder steam pipeline temperature and pressure meeting preset conditions, a gas turbine rotating speed analog signal input module 605, a turbine rotating speed analog signal input module 606, a fourth stage pre-warming completed switching value signal output module 607, a sixth and module 608, a seventh and module 609, an eighth and module 610, a first comparison larger than module 611 and a second comparison larger than module 612.
The pre-warming medium-pressure butterfly valve fully-opened switching value signal input module 601, the medium-pressure regulating valve fully-opened switching value input module 602 and the high-pressure gate valve fully-opened switching value signal input module 603 are connected with the input end of the sixth and module 608. The analog engine speed input module 605 is coupled to an input of a first larger than module 611. The analog quantity signal input module 606 for the turbine speed is connected to the input of the second compare greater module 612. The first larger comparison module 611 and the second larger comparison module 612 are both connected to the input terminals of the seventh and the module 609. The output ends of the sixth and module 608 and the switching value signal input module 604 and the seventh and module 609, where the temperature and pressure of the warm cylinder steam pipe all satisfy the preset conditions, are connected to the input end of the eighth and module 610. The output end of the eighth and module 610 is connected to the switching value signal output module 607 which completes the pre-warming in the fourth stage.
That is, when the pre-warming medium-pressure butterfly valve is in the fully open state, the switching value signal input module 601 that the pre-warming medium-pressure butterfly valve is fully open outputs the switching value signal of 1. When the medium pressure regulating valve is in a fully open state, the switching value signal output by the switching value input module 602 in which the medium pressure regulating valve is fully open is 1. When the high-pressure gate valve is fully opened, the switching amount signal input block 603 that fully opens the high-pressure gate valve outputs a switching amount signal of 1, in which case the output signal of the sixth and block 608 is 1.
The first ratio is larger than a preset engine speed threshold in the module 611, for example, the engine speed threshold is 600r/min, when the output value of the analog signal input module 605 of the engine speed is larger than 600r/min, the output signal of the module 611 with the first ratio is 1. The second comparison is greater than a 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 quantity signal input module 606 of the turbine speed is greater than 15r/min, the output signal of the second comparison greater than the module 612 is 1. Therefore, the fourth pre-heating stage can be determined to be completed when the fourth pre-heating unit opens the pre-heating medium-pressure butterfly valve, the medium-pressure regulating valve and the high-pressure gate valve, the temperature and the pressure of the steam pipeline of the warming cylinder meet the preset conditions, and the rotating speed of the combustion engine and the rotating speed of the steam turbine meet respective set values. If the output signal of any module connected to the input terminal of the eighth and the module 610 is 0, the completion condition of the fourth pre-warming stage is not satisfied, and the related signals and the devices thereof need to be checked and processed until the completion condition of the fourth pre-warming stage is satisfied.
As another possible embodiment, as shown in fig. 7, the fourth pre-warming unit may further include: the switching value signal input module 701 of the fourth pre-warming stage manual confirmation button is also connected to the input terminal of the eighth and module 610, and the connection manner of the other modules is the same as that in fig. 6, which is not described herein again. The switching value signal input module 701 for manually confirming the button in the fourth pre-warming stage is introduced, which is equivalent to adding a manual confirmation link in the fourth pre-warming stage, so that the problems of equipment abnormality and the like can be avoided through checking and confirmation of related workers, and smooth starting of the unit is further ensured.
In some embodiments of the present application, after the fourth pre-warming period is completed, the fifth pre-warming unit determines whether the fifth pre-warming period is completed according to the state of the turbine. And when the turbine starting sequence control is ready, the fifth pre-warming unit determines that the fifth pre-warming stage is finished, namely the target of cold pre-warming is achieved.
As one possible embodiment, as shown in fig. 8, the fifth pre-warming unit may include: a switching value signal input module 801 ready for turbine sequential control starting and a switching value signal output module 802 completed in the fifth pre-warming stage, wherein the switching value signal input module 801 ready for turbine sequential control starting is connected with the switching value signal output module 802 completed in the fifth pre-warming stage.
That is to say, when the turbine sequential control start is ready, the switching value signal output by the switching value signal input module 801 of the turbine sequential control start ready is 1, which proves that the warming-up steam is fully warmed up, the turbine has already been started up and warmed up, and the cold warming-up control process is finished smoothly.
In other embodiments of the present application, in combination with the fifth pre-warming unit, in an actual power plant application, in order to avoid the fifth pre-warming stage from being triggered by mistake, the third pre-warming unit may further add logic for excluding the fifth pre-warming stage from being triggered by mistake on the basis of the structure shown in fig. 5. As shown in fig. 9, the third pre-warming 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 warming the cylinder steam pipeline temperature, a switching value signal input module 903 for warming the cylinder steam pipeline pressure, a fourth AND module 904, a fifth AND module 905 and a first OR module 906.
The switching value signal input module 901 for the instruction of the fifth pre-warming stage and the switching value signal input module 902 for the temperature of the steam pipeline in the warming cylinder are connected with the input end of the fourth and module 904. The switching value signal input module 901 for the pre-warming fifth stage instruction and the switching value signal input module 903 for the warming cylinder steam pipeline pressure are connected with the input ends of the fifth and module 905. The output end of the fourth and module 904, the output end of the fifth and module 905 and the switching value signal input module 501 of which the superheat degree of the main steam is less than the superheat degree threshold are connected with the input end of the first or module 906. An output of the first or module 906 is connected to an input of the first non-module 506. When the pre-warming fifth stage is completed, the switching value signal output by the switching value signal input module 901 of the pre-warming fifth stage instruction is 1. When the temperature of the steam pipeline of the warm cylinder 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 steam pipeline of the warm cylinder is 1, when the pressure of the steam pipeline of the warm cylinder 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 steam pipeline of the warm cylinder 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 steam pipeline of the warm cylinder and the switching value signal input module 903 of the pressure of the steam pipeline of the warm cylinder are consistent with the preset conditions of the switching value signal input module 502 in which the temperature and the pressure of the steam pipeline of the warm cylinder both meet the preset conditions.
That is to say, the third pre-heating unit only confirms that the third pre-heating stage is completed when the fifth pre-heating stage is not completed, the main steam superheat degree is greater than or equal to the preset superheat degree threshold value, the temperature and the pressure of the steam pipeline of the warm cylinder both meet the preset conditions, and the drain valve of the warm cylinder is opened at the same time.
According to the cold state pre-warming control system of the gas and steam combined cycle unit, the steam turbine is pre-warmed in advance through the cold state pre-warming control system of the gas and steam combined cycle unit, the conventional pre-warming duration of the unit is shortened, and therefore the purposes of energy conservation and efficiency improvement can be achieved. The system performs full-automatic intelligent control on the whole pre-warming process through a plurality of pre-warming units, not only can avoid the occurrence of system faults and signal jump change problems, but also can ensure the smooth starting of the unit.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like 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, 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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 (8)
1. A cold state pre-warming control system of a gas and steam combined cycle unit is characterized by being applied to a coaxial gas and steam combined cycle unit, wherein a high-pressure pre-warming steam pipeline and a medium-pressure pre-warming steam pipeline are additionally arranged on the side of a steam turbine of the coaxial gas and steam combined cycle unit, the high-pressure pre-warming steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure pre-warming steam pipeline is directly communicated with the side of a medium-pressure cylinder, and pre-warming valve groups are respectively arranged on the high-pressure pre-warming steam pipeline and the medium-pressure pre-warming steam pipeline; the system comprises:
the first pre-warming unit is used for determining whether the first pre-warming stage is finished or not according to the switching conditions of the warm cylinder drain valve, the high-discharge check valve and the high-discharge ventilation valve;
the second pre-warming unit is used for determining whether the second pre-warming stage is finished or not according to the switching conditions of the low side valve, the high side valve, the middle side valve and the steam turbine electric isolation valve after the first pre-warming stage is finished;
the third pre-heating unit is used for determining whether the third pre-heating stage is finished or not according to the superheat degree of the main steam, the temperature and the pressure of the steam pipeline of the cylinder heater and the switching condition of the drain valve of the cylinder heater after the second pre-heating stage is finished;
the fourth pre-warming unit is used for determining whether the fourth pre-warming stage is finished or not according to the switching conditions of a pre-warming medium-pressure butterfly valve, a medium-pressure regulating valve and a high-pressure gate valve, the temperature and the pressure of the steam pipeline of the warming cylinder, the rotating speed of the gas turbine and the rotating speed of the steam turbine after the third pre-warming stage is finished;
and the fifth pre-warming unit is used for determining whether the fifth pre-warming stage is finished or not according to the state of the steam turbine after the fourth pre-warming stage is finished.
2. The system of claim 1, wherein the first pre-warming unit comprises: the system comprises a switching value signal input module for fully opening a drain valve of a warm cylinder, a switching value signal input module for fully closing a high-discharge check valve, a switching value signal input module for fully opening a high-discharge ventilation valve, a switching value signal output module for completing a first pre-warming stage and a first AND module; wherein:
the switching value signal input module of the fully-opened cylinder warming drain valve, the switching value signal input module of the fully-closed high-discharge check valve and the switching value signal input module of the fully-opened high-discharge ventilation valve are connected with the input end of the first and module; and the output end of the first and module is connected with the switching value signal output module which finishes the first pre-warming stage.
3. The system of claim 1, wherein the second pre-warming unit comprises: the system comprises a low bypass valve full-closed switching value signal input module, a high bypass valve full-closed switching value signal input module, a middle bypass valve full-closed switching value signal input module, a steam turbine electric isolation valve full-closed switching value signal input module, a switching value signal output module finished in a second pre-warming stage and a second AND module; wherein:
the switching value signal input module of the low side valve full-close, the switching value signal input module of the high side valve full-close, the switching value signal input module of the middle side valve full-close and the switching value signal input module of the steam turbine electric isolation valve full-close are connected with the input ends of the second and module; and the switching value signal output module finished in the second pre-warming 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 system 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 superheat degree of main steam is smaller than a superheat degree threshold value, and the temperature and the pressure of a steam pipeline of a warm cylinder meet preset conditions; 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 closed state of the warm cylinder drain valve 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 with the temperature and the pressure of the cylinder warming steam pipeline meeting preset conditions and the switching value signal input module with the open state of the cylinder warming drain valve are connected with the input end of the third and module; and the output end of the third and module is connected with the switching value signal output module which completes the third pre-warming stage.
5. The system of claim 4, the third pre-warming unit further comprising: a switching value signal input module for pre-warming a fifth stage instruction, a switching value signal input module for warming the temperature of a cylinder steam pipeline, a switching value signal input module for warming the pressure of the 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-warming fifth stage instruction and the switching value signal input module of the warming cylinder steam pipeline temperature are connected with the input ends of the fourth and the fourth modules; the switching value signal input module of the pre-warming fifth stage instruction and the switching value signal input module of the warming cylinder steam pipeline pressure are connected with the input ends of the fifth and the module; the output end of the fourth and module, the output end of the fifth and module and the switching value signal input module of which the main steam superheat degree is less than the superheat degree threshold are connected with the input end of the first or module; and 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 pre-warming medium-pressure butterfly valve fully-opened switching value signal input module, a medium-pressure regulating valve fully-opened switching value input module, a high-pressure gate valve fully-opened switching value signal input module, a warming cylinder steam pipeline switching value signal input module with temperature and pressure meeting preset conditions, a gas turbine rotating speed analog signal input module, a steam turbine rotating speed analog signal input module, a fourth stage pre-warming completed switching value signal output module, a sixth AND module, a seventh AND module, an eighth AND module, a first comparison larger module and a second comparison larger module; wherein:
the pre-warming medium-pressure butterfly valve fully-opened switching value signal input module, the medium-pressure regulating valve fully-opened switching value signal input module and the high-pressure gate valve fully-opened switching value signal input module are connected with the input end of the sixth and module; the analog signal input module of the rotating speed of the gas turbine is connected with the input end of the first larger 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 larger module and the second comparison larger module are both connected with the input end of the seventh comparison module; the output end of the sixth and module, the output end of the switching value signal input module and the output end of the seventh and module, which meet the preset conditions for the temperature and the pressure of the cylinder warming steam pipeline, are connected with the input end of the eighth and module; and the output end of the eighth and module is connected with the switching value signal output module which finishes the fourth-stage pre-warming.
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-warming 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 system comprises a switching value signal input module for ready sequential control starting of the steam turbine and a switching value signal output module for finishing a fifth pre-warming stage, wherein the switching value signal input module for ready sequential control starting of the steam turbine is connected with the switching value signal output module for finishing the fifth pre-warming stage.
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