CN115263448B - Cold state pre-heating start control test method for gas-steam combined cycle unit steam turbine - Google Patents
Cold state pre-heating start control test method for gas-steam combined cycle unit steam turbine Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 146
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 56
- 238000012360 testing method Methods 0.000 claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 35
- 239000000446 fuel Substances 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- 239000002918 waste heat Substances 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000008646 thermal stress Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- 238000012802 pre-warming Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
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Classifications
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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 starting control test method of a gas-steam combined cycle unit steam turbine, which is 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 side of the coaxial gas-steam combined cycle unit steam turbine, the high-pressure preheating steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, and the medium-pressure preheating steam pipeline is directly communicated with the side of the medium-pressure cylinder; comprising the following steps: checking the control of the pre-heating valve group; the starting control logic of the steam turbine is adjusted by combining the connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline; determining a starting mode of a fuel engine in the coaxial gas-steam combined cycle unit; the method comprises the steps of performing cold pre-heating start test on a turbine of the coaxial gas-steam combined cycle unit, and monitoring phenomena occurring in the test process; and (3) continuing optimizing the start control logic of the steam turbine according to the phenomenon in the test process.
Description
Technical Field
The application relates to the technical field of power generation of a gas-steam combined cycle unit, in particular to a cold state pre-heating start control test method of a gas-steam combined cycle unit steam turbine.
Background
The cold state preheating technology is applied to various units of a thermal power plant, such as 200MW, 350MW, 600MW and 1000MW units, the cold state preheating target is realized through different methods, the starting time of the units is effectively shortened, the units can be used for generating power and connecting the units more quickly, and the peak shaving capacity of the units is improved.
The coaxial gas-steam combined cycle unit firstly uses a cold state preheating technology, two paths of preheating steam pipelines are added on the side of a steam turbine, and the preheating steam pipelines respectively act on a high-pressure main steam pipeline of a high-pressure cylinder of the steam turbine and the side of a medium-pressure cylinder. However, a corresponding cold state pre-heating starting control strategy for the gas turbine of the gas-steam combined cycle unit is lacking at present.
Disclosure of Invention
In order to solve the problems, the application provides a cold state pre-heating start control test method for a gas-steam combined cycle unit steam turbine.
According to one aspect of the application, a cold state pre-heating start control test method of a gas-steam combined cycle unit steam turbine is provided, the method is applied to a coaxial gas-steam combined cycle unit, a high-pressure pre-heating steam pipeline and a medium-pressure pre-heating steam pipeline are added on the side of the coaxial gas-steam combined cycle unit steam turbine, wherein the high-pressure pre-heating steam pipeline is connected with a main steam pipeline of a high-pressure cylinder, the medium-pressure pre-heating steam pipeline is directly communicated with the side of the medium-pressure cylinder, and pre-heating valve groups are arranged on the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline; comprising the following steps:
checking the control of the preheating valve bank;
the starting control logic of the steam turbine is adjusted by combining the connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline;
determining a starting mode of a fuel engine in the coaxial gas-steam combined cycle unit;
the cold state pre-heating start test of the turbine of the coaxial gas-steam combined cycle unit is carried out, and the phenomenon in the test process is monitored;
and continuously optimizing the start control logic of the steam turbine according to the phenomenon in the test process.
In some embodiments of the present application, the verifying the control of the pre-heating valve group includes:
issuing an instruction signal to the pre-heating valve group based on a distributed control system;
acquiring a feedback signal of the pre-heating valve group based on the instruction signal;
comparing the instruction signal with the feedback signal;
and in response to the difference between the instruction signal and the feedback signal being greater than a preset signal threshold, checking a signal channel of the distributed controllable system to realize control of the preheating valve group by the distributed control system.
In some embodiments of the present application, the adjusting the start control logic of the steam turbine in combination with the connection mode of the high pressure pre-heating steam pipe and the medium pressure pre-heating steam pipe includes:
determining a parameter signal to be adjusted in a starting control logic of the steam turbine by combining a connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline; the parameter signals to be adjusted comprise a switching value signal of a Z2 criterion, a switching value signal of a Z4 criterion and a switching value signal of an X6 criterion;
and shielding the parameter signals to be adjusted in the starting control logic of the steam turbine.
In other embodiments of the present application, the adjusting the start control logic of the steam turbine in combination with the connection mode of the high pressure pre-heating steam pipe and the medium pressure pre-heating steam pipe further includes:
and in response to the pre-heating steam of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline coming from the waste heat boiler, logic for setting an output limiting system of the waste heat boiler to a preset value is added in starting control logic of the steam turbine.
Wherein, the determining the starting mode of the fuel engine in the coaxial gas-steam combined cycle unit comprises the following steps:
and determining the starting mode of the fuel engine in the coaxial gas-steam combined cycle unit as a water washing starting mode.
As a possible implementation manner, the optimizing the start control logic of the steam turbine according to the phenomenon occurring in the test process includes:
and responding to the phenomenon during the test, wherein the phenomenon comprises that a high-discharge check valve is automatically opened during the starting process, and a switching value signal of the automatic opening of the high-discharge check valve is shielded in starting control logic of the steam turbine.
As another possible implementation manner, the optimizing the start control logic of the steam turbine according to the phenomenon occurring in the test process includes:
and in response to the phenomenon occurring in the test process, including stopping the test when the superheat degree of the pre-warmed steam is lower than a superheat degree threshold value, adding judgment logic for the quality of the pre-warmed steam in start control logic of the steam turbine.
As a further possible embodiment, the optimizing the start control logic of the steam turbine according to the phenomenon occurring in the test process includes:
logic for masking a switching value signal of a state of the medium pressure main valve during a pre-warm phase is added to start control logic of the steam turbine in response to a phenomenon occurring during the test including the medium pressure main valve failing to open.
As a further possible embodiment, the optimizing the start control logic of the steam turbine according to the phenomenon occurring in the test process includes:
and in response to the phenomenon occurring in the test process, including that the unit rotational speed rising rate exceeds a preset rotational speed change threshold, increasing the setting of the unit rotational speed rising rate in the pre-heating stage in the starting control logic of the steam turbine.
According to the technical scheme, for the coaxial gas-steam combined cycle unit with the added pre-heating steam pipeline, the control of the pre-heating valve group is verified, the starting control logic of the steam turbine is adjusted by combining the connection mode of the pre-heating steam pipeline, the starting mode of gas is determined, and the starting control logic of the steam turbine is continuously optimized by combining the phenomenon in the cold pre-heating starting test of the steam turbine, so that the optimized starting control logic of the steam turbine is suitable for cold pre-heating starting of the steam turbine with the added pre-heating steam pipeline.
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 flow chart of a method for controlling cold pre-heating start of a steam turbine 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 flow chart illustrating the adjustment of the start control logic of a steam turbine in accordance with an embodiment of the present application;
FIG. 4 is a flow chart of optimizing start-up control logic for a steam turbine 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 the cold state pre-heating technology is already applied to various units of a thermal power plant, such as 200MW, 350MW, 600MW and 1000MW units, all achieve the goal of cold state pre-heating through different methods, effectively reduce the starting time of the units, enable the units to generate power and grid more quickly, and improve the peak shaving capacity of the units.
The coaxial gas-steam combined cycle unit firstly uses a cold state preheating technology, two paths of preheating steam pipelines are added on the side of a steam turbine, and the preheating steam pipelines respectively act on a high-pressure main steam pipeline of a high-pressure cylinder of the steam turbine and the side of a medium-pressure cylinder. However, a corresponding cold state pre-heating starting control strategy for the gas turbine of the gas-steam combined cycle unit is lacking at present.
In order to solve the problems, the application provides a cold state pre-heating start control test method for a gas-steam combined cycle unit steam turbine.
FIG. 1 is a flow chart of a method for controlling cold pre-heating start of a steam turbine of a gas-steam combined cycle unit according to an embodiment of the application. It should be noted that the cold state preheating start control test method of the gas-steam combined cycle unit steam turbine is applied to the coaxial gas-steam combined cycle unit, and a high-pressure preheating steam pipeline and a medium-pressure preheating steam pipeline are added to 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. 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, the test method includes the steps of:
and step 101, checking the control of the pre-heating valve group.
In some embodiments of the present application, since the pre-heating valve sets are newly added valve sets on the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline in the unit, the valve sets need to be checked for feedback command actions one by one.
In some embodiments of the present application, an implementation of verifying control of a pre-warm valve bank may include: based on a distributed control system, issuing an instruction signal to the pre-heating valve group; acquiring a feedback signal of the pre-heating valve group based on the instruction signal; comparing the instruction signal with the feedback signal; and in response to the difference between the command signal and the feedback signal being greater than a preset signal threshold, checking a signal channel of the distributed controllable system to realize control of the distributed control system on the pre-heating valve group.
As an example, based on the distributed control system, a command signal is issued to each valve in the pre-heating valve group, and the issuing of the command signal includes: 0%, 25%, 50%, 75%, 100% of five instructions; after the instruction is issued, a feedback signal of the pre-heating valve group is waited to be transmitted to a distributed control system, and the issued instruction signal is compared with the feedback signal; if the deviation between the command signal and the feedback signal is within +/-1, the command feedback action of the pre-heating valve group is successfully checked, namely the distributed control system can successfully control the pre-heating valve group; if the deviation between the command signal and the feedback signal is greater than +/-1, checking a signal channel of the distributed control system is needed, if a problem exists, replacing a clamping piece of the distributed control system or a cable and the like is needed, and after replacement, checking the control of the pre-heating valve group again so as to realize the control of the distributed control system on the pre-heating valve group.
Step 102, adjusting the start control logic of the steam turbine by combining the connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline.
In some embodiments of the present application, parameter signals involved in the start-up control logic of the steam turbine may be monitored first, and these parameter signals may include: the method comprises the following steps of switching value signals of full opening of a drain valve of a heating cylinder, switching value signals of full opening of a high-pressure check valve, switching value signals of full opening of a high-pressure vent valve, switching value signals of full closing of a low bypass valve, switching value signals of full closing of a high bypass valve, switching value signals of full closing of a middle bypass valve, switching value signals of full closing of an electric isolating valve of a steam turbine, analog value signals of temperature of a steam pipeline of the heating cylinder, analog value signals of pressure of the steam pipeline of the heating cylinder, analog value signals of superheat degree of main steam, switching value signals of drain valve state of the heating cylinder, switching value signals of a pre-heating middle pressure butterfly valve state, switching value signals of middle pressure regulating valve state, switching value signals of high-pressure gate valve state, switching value signals of all X criteria and Z criteria of thermal stress of the steam turbine, switching value signals of the high-pressure main valve state, switching value signals of the middle pressure main valve state and the like. Based on the parameter signals, the starting control logic of the original steam turbine is checked, and the connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline is combined and the safety, the rationality and the feasibility of the test are analyzed so as to ensure the safety of unit equipment and related staff.
In some embodiments of the present application, since the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline are added to the unit, control logic of the pre-heating valve group in the pre-heating stage needs to be added in the start-up control logic of the steam turbine, for example, the pre-heating valve group is opened in the pre-heating stage, and the pre-heating valve group is closed after the steam turbine is connected to the grid and normally works. Considering the source of pre-warmed steam in the high pressure pre-warmed steam line and the medium pressure pre-warmed steam line, it is necessary to add control logic for the source of pre-warmed steam to the start-up control logic of the steam turbine. In addition, because the starting mode adopts a cold state preheating mode, the corresponding thermal stress criterion in the original control logic is not triggered any more, and the corresponding accurate shielding can be performed for smoothly performing the starting test process.
And 103, determining a starting mode of the fuel engine in the coaxial gas-steam combined cycle unit.
In some embodiments of the application, the manner in which the combustion engine is started generally includes a normal start mode, a water wash start mode, and a purge start mode. In the normal starting mode and the blowing starting mode, the combustion engine can firstly complete the process of high-disk blowing, and the unstable condition of the rotation speed of the combustion engine can occur at the moment, so that the engagement of the combustion engine and the steam turbine is not facilitated when the cold state is preheated and the rotation speed is low, and therefore, the two starting modes are not suitable for the cold state preheating starting process of the steam turbine. During the start-up of the water wash mode, the combustion engine can maintain a smooth rotational speed. Because the unit applied by the cold state preheating technology is a coaxial one-to-one combined cycle unit, and the steam turbine is meshed with the gas turbine when the preheating speed is low, the stable speed of the gas turbine is the most critical, the starting mode of the gas turbine in the coaxial gas steam combined cycle unit is determined to be a water washing starting mode.
And 104, performing cold state pre-heating start test on the turbine of the coaxial gas-steam combined cycle unit, and monitoring phenomena in the test process.
That is, after the preparation of steps 101 to 103, the cold pre-heating start test of the turbine of the combined gas and steam cycle is started, and the phenomenon occurring in the test process is monitored.
And 105, continuing to optimize the start control logic of the steam turbine according to the phenomenon in the test process.
It can be understood that the adjustment performed on the start control logic of the steam turbine in step 102 is an adjustment scheme obtained by analyzing the connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline, but in the actual test process, problems which are not found in the analysis process and other abnormal problems may possibly occur, so that the start control logic of the steam turbine needs to be continuously optimized in combination with phenomena occurring in the test process.
As an example, if the superheat degree of the pre-heating steam is lower than 56 ℃ in the test process, a signal of automatically stopping cold pre-heating is triggered, so that the test is stopped, the pre-heating process cannot be performed when the superheat degree of the pre-heating steam is too low. In this case, by adding the judgment logic for the superheat degree of the pre-heating steam in the start control logic of the steam turbine, when the superheat degree of the pre-heating steam meets the requirement of cold pre-heating start, the start can be continued.
According to the cold state pre-heating start control test method of the gas-steam combined cycle unit steam turbine, for the coaxial gas-steam combined cycle unit with the pre-heating steam pipeline, the control of the pre-heating valve group is verified, the start control logic of the steam turbine is adjusted by combining the connection mode of the pre-heating steam pipeline, the start mode of the gas is determined, and the start control logic of the steam turbine is continuously optimized by combining the phenomenon in the cold state pre-heating start test of the steam turbine, so that the start control logic of the optimized steam turbine is suitable for the cold state pre-heating start of the steam turbine with the pre-heating steam pipeline.
Next, a detailed description will be given of an implementation procedure for adjusting the start control logic of the steam turbine with respect to a connection manner of the high-pressure pre-heating steam pipe and the medium-pressure pre-heating steam pipe.
FIG. 3 is a flow chart illustrating the adjustment of the start control logic of a steam turbine in accordance with an embodiment of the present application. As shown in fig. 3, based on the above embodiment, the implementation of step 102 in fig. 1 may include the following steps:
step 301, determining a parameter signal to be adjusted in a start control logic of a steam turbine by combining a connection mode of a high-pressure pre-heating steam pipeline and a medium-pressure pre-heating steam pipeline; the parameter signals to be adjusted comprise a switching value signal of a Z2 rule, a switching value signal of a Z4 rule and a switching value signal of an X6 rule.
In one embodiment of the application, the parameter signals involved in the start control logic of the steam turbine can be monitored and checked, and as the medium pressure pre-heating steam pipeline directly acts on the medium pressure cylinder, the corresponding thermal stress X criterion and Z criterion cannot be triggered in the start process, and if the steam turbine is started according to the original control logic, the steam turbine waits in the steps involving the thermal stress X criterion and Z criterion, so that the start test cannot be continued. The switching value signal of the Z2 rule, the switching value signal of the Z4 rule and the switching value signal of the X6 rule of the parameter signals involved in the start control logic of the steam turbine are used as parameter signals to be adjusted.
Step 302, masking a parameter signal to be adjusted in a start control logic of the steam turbine.
That is, the step related to the parameter signal to be adjusted is shielded, that is, the step related to the parameter signal to be adjusted is directly skipped in the start control logic of the steam turbine, so as to avoid the problem that the steam turbine cannot be started.
In some embodiments of the present application, step 102 in fig. 1 may further include:
in step 303, logic for setting an output limit system of the waste heat boiler to a preset value is added to the start control logic of the steam turbine in response to the pre-heating steam from the high pressure pre-heating steam line and the medium pressure pre-heating steam line.
That is, in order to prevent a problem that the pre-heating steam flow is insufficient due to the existing system of the output of the waste heat boiler during the pre-heating process for the case that the pre-heating steam of the high-pressure pre-heating steam pipe and the medium-pressure pre-heating steam pipe comes from the waste heat boiler, the output limiting system of the waste heat boiler may be set to a preset value, for example, the output limiting system of the waste heat boiler may be set to 100%, in advance, so that the waste heat boiler may continuously provide stable pre-heating steam.
According to the cold state preheating starting control test method for the gas steam combined cycle unit steam turbine, provided by the embodiment of the application, the switching value signal of the Z2 standard, the switching value signal of the Z4 standard and the switching value signal of the X6 standard are determined as parameter signals to be regulated in the starting control logic of the steam turbine by combining the connection mode of the high-pressure preheating steam pipeline and the medium-pressure preheating steam pipeline, and the parameter signals to be regulated in the starting control logic of the steam turbine are shielded, so that the problem that the steam turbine waits and cannot continue the starting test is avoided. In addition, for the condition that the waste heat boiler is a source of pre-heating steam, the setting logic of the output limiting system of the waste heat boiler is added in the starting control logic of the steam turbine, so that the waste heat boiler can continuously provide stable pre-heating steam, and the normal operation of the pre-heating process is ensured.
Next, a detailed description will be given of an implementation procedure for continuing to optimize the start control logic of the steam turbine according to the phenomenon occurring during the test.
FIG. 4 is a flow chart of optimizing start-up control logic for a steam turbine according to an embodiment of the present application. As shown in fig. 4, based on the above embodiment, the implementation procedure of step 105 in fig. 1 may include the following steps:
step 401, in response to a phenomenon occurring during the test, including automatic opening of the high-relief check valve during start-up, masking a switching value signal of the automatic opening of the high-relief check valve in start-up control logic of the steam turbine.
In some embodiments of the present application, the phenomena occurring during the cold pre-heating process of the steam turbine include: the high-row check valve is in a fully closed state firstly, and after a large amount of pre-heating steam flows to the high-row check valve, the pressure and temperature parameters before and after the high-row check valve are changed, so that the high-row check valve is automatically opened.
As another possible implementation, step 105 in fig. 1 may also include the following steps:
in response to a phenomenon occurring during the test, including the stopping of the test when the superheat degree of the pre-warmed steam is below the superheat degree threshold, a judgment logic for the quality of the pre-warmed steam is added to the start control logic of the steam turbine, step 402.
In some embodiments of the present application, if the superheat degree of the pre-heating steam is lower than the superheat degree threshold in the test process, a signal for automatically stopping cold pre-heating is triggered, so that the test is stopped, which indicates that the cold pre-heating start process cannot be performed when the superheat degree of the pre-heating steam is too low. For example, when the superheat degree of the pre-heating steam is lower than 56 ℃ in the starting process, a signal for automatically stopping cold pre-heating is triggered, so that the test is stopped. In order to solve the problem, a judgment logic for the quality of the pre-heating steam can be added in a start control logic of the steam turbine, and when the superheat degree of the pre-heating steam meets the requirement of cold pre-heating start, the start can be continued.
As yet another possible implementation, step 105 in fig. 1 may also include the steps of:
in response to the phenomena occurring during the test including failure of the medium pressure main valve to open, logic is added to the startup control logic of the steam turbine to mask the switching value signal of the medium pressure main valve state during the pre-warm phase, step 403.
In some embodiments of the application, the phenomenon that the medium pressure main valve cannot be opened occurs in the test process, because the medium pressure pre-heating steam pipeline directly acts on the medium pressure cylinder, but does not act on the medium pressure main valve to pre-heat, so that logic for shielding a switching value signal of the state of the medium pressure main valve in a pre-heating stage can be added in starting control logic of the steam turbine.
In addition, step 105 in fig. 1 may further include the steps of:
in step 404, in response to a phenomenon occurring during the test including the unit rotational speed rise rate exceeding a preset rotational speed change threshold, the setting of the unit rotational speed rise rate at the pre-warm stage is increased in the turbine start-up control logic.
In some embodiments of the application, the rising speed of the rotating speed of the machine set is too high in the test process, so that the phenomenon that the rising speed exceeds a preset rotating speed change threshold value causes fluctuation of various parameters, and the safety start of the machine set is verified. Aiming at the situation, the setting of the rising speed of the rotating speed of the unit in the pre-heating stage is increased in the starting control logic of the steam turbine, so that the stability of various parameters is ensured, and the safe starting of the unit is ensured.
According to the cold state pre-heating start control test method of the gas-steam combined cycle unit steam turbine, corresponding solutions are determined according to the phenomenon in the test process, and the start control logic of the steam turbine is continuously optimized, so that the optimized start control logic of the steam turbine is suitable for cold state pre-heating start of the steam turbine after a pre-heating steam pipeline is added.
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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
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. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well 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 (6)
1. The cold state preheating start control test method for the gas steam combined cycle unit steam turbine is characterized in that the method 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 steam 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; comprising the following steps:
checking the control of the preheating valve bank;
determining a parameter signal to be adjusted in starting control logic of the steam turbine by combining a connection mode of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline, and shielding the parameter signal to be adjusted, wherein logic for setting an output limiting system of the waste heat boiler to a preset value is added in the starting control logic of the steam turbine in response to pre-heating steam of the high-pressure pre-heating steam pipeline and the medium-pressure pre-heating steam pipeline from the waste heat boiler, and the parameter signal to be adjusted comprises switching value signals of all Z2 criteria, switching value signals of Z4 criteria and switching value signals of X6 criteria in thermal stress of the steam turbine;
determining a starting mode of a fuel machine in the coaxial gas-steam combined cycle unit, wherein the starting mode of the fuel machine in the coaxial gas-steam combined cycle unit is determined to be a water washing starting mode;
the cold state pre-heating start test of the turbine of the coaxial gas-steam combined cycle unit is carried out, and the phenomenon in the test process is monitored;
and continuously optimizing the start control logic of the steam turbine according to the phenomenon in the test process.
2. The method of claim 1, wherein said verifying control of the pre-warming valve bank comprises:
issuing an instruction signal to the pre-heating valve group based on a distributed control system;
acquiring a feedback signal of the pre-heating valve group based on the instruction signal;
comparing the instruction signal with the feedback signal;
and in response to the difference between the instruction signal and the feedback signal being greater than a preset signal threshold, checking a signal channel of the distributed control system to realize control of the distributed control system on the pre-heating valve group.
3. The method of claim 1, wherein said continuing to optimize start-up control logic for said steam turbine based on phenomena occurring during said test comprises:
and responding to the phenomenon during the test, wherein the phenomenon comprises that a high-row check valve is automatically opened during the starting process, and a switching value signal of the automatic opening of the high-row check valve is shielded in starting control logic of the steam turbine.
4. The method of claim 1, wherein said continuing to optimize start-up control logic for said steam turbine based on phenomena occurring during said test comprises:
and in response to the phenomenon occurring in the test process, including stopping the test when the superheat degree of the pre-warmed steam is lower than a superheat degree threshold value, adding judgment logic for the quality of the pre-warmed steam in start control logic of the steam turbine.
5. The method of claim 1, wherein said continuing to optimize start-up control logic for said steam turbine based on phenomena occurring during said test comprises:
logic for masking a switching value signal of a state of the medium pressure main valve during a pre-warm phase is added to start control logic of the steam turbine in response to a phenomenon occurring during the test including the medium pressure main valve failing to open.
6. The method of claim 1, wherein said continuing to optimize start-up control logic for said steam turbine based on phenomena occurring during said test comprises:
and in response to the phenomenon occurring in the test process, including that the unit rotational speed rising rate exceeds a preset rotational speed change threshold, increasing the setting of the unit rotational speed rising rate in the pre-heating stage in the starting control logic of the steam turbine.
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