Starting optimization method for pressure cylinder in ultra-supercritical turboset

Abstract

The invention relates to the technical field of pressure cylinder starting control, in particular to a pressure cylinder starting optimization method in an ultra-supercritical turboset. The method comprises the following steps: constructing a time sequence database to store pressure cylinder starting data; constructing a pressure cylinder starting dynamic model according to the pressure cylinder starting data; performing dynamic parameter optimization on the pressure cylinder starting dynamic model to obtain a pressure cylinder starting optimization model; the control logic in the starting process of the pressure cylinder is preprocessed and transformed; and abnormal monitoring is carried out on the starting process of the pre-processed and transformed pressure cylinder so as to dynamically adjust the starting process of the pressure cylinder. By means of the technical scheme, optimization of the starting process of the pressure cylinder in the turboset can be achieved, the starting time of the pressure cylinder is shortened, and monitoring and early warning of starting faults are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of pressure cylinder startup control, and in particular to a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit. Background Art

[0002] Ultra-supercritical means higher steam temperature and pressure, and the higher the steam temperature and pressure input to the steam turbine, the higher the efficiency. At present, ultra-supercritical units have the highest technical inheritance and feasibility. At the same time, high-efficiency ultra-supercritical power generation has the highest efficiency and the lowest construction cost, and has the best cost-effectiveness.

[0003] Compared with ultra-supercritical units, the increase in steam temperature and pressure parameters of high-efficiency ultra-supercritical units has brought higher and newer requirements for key component materials, especially the thermal strength, high-temperature corrosion and oxidation resistance, cold processing and hot processing performance of materials. This makes the components in ultra-supercritical units more prone to failure or unstable state, so it is particularly important to timely detect and warn the start-up status of the pressure cylinder.

[0004] During the unit startup preparation phase, operators need to follow strict procedures and start each system equipment one by one to ensure the smooth startup of the unit as a whole. This process requires operators to confirm that each device is operating normally after starting it before starting the next device. Although this method ensures the rigor of the startup, it undoubtedly increases the time cost. At the same time, since the status parameters of the equipment components cannot be optimized and adjusted in time, the unit is prone to various potential failure problems during the long startup process. Summary of the invention

[0005] In order to overcome the problem that it is difficult to effectively control the start-up process of the intermediate pressure cylinder of a steam turbine unit in the related art, the present application provides an optimization method for the start-up of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit, including: constructing a time series database to store cylinder start-up data; constructing a cylinder start-up dynamic model according to the cylinder start-up data, and the cylinder start-up dynamic model constructed by the cylinder start-up data satisfies the relationship: In the formula, Q in is the flow rate of water vapor into the cylinder, Q out is the flow rate of steam out of the cylinder, s is the differential operator with respect to time, T V represents the steam volume effect time constant, V is the volume of the pressure cylinder; the dynamic parameters of the pressure cylinder start-up dynamic model are optimized to obtain the pressure cylinder start-up optimization model; the control logic in the pressure cylinder start-up process is preprocessed and transformed; the pressure cylinder is started, and based on the pressure cylinder start-up optimization model, the pressure cylinder start-up process after preprocessing and transformation is monitored for abnormalities to dynamically adjust the pressure cylinder start-up process.

[0006] In this way, by constructing a time series database, we can realize the massive collection of cylinder start-up process data and provide solid data support. By constructing a dynamic model of cylinder start-up, we can provide theoretical guidance and optimization for the cylinder start-up process, realize the monitoring of cylinder start-up, and further optimize the dynamic model of cylinder start-up to obtain a more accurate cylinder start-up optimization model, so as to realize dynamic real-time monitoring of the cylinder start-up process. At the same time, through pre-processing and transformation means, we can comprehensively optimize the cylinder start-up process, thereby reducing the cylinder start-up time and realizing the monitoring and early warning of start-up failures.

[0007] Optionally, constructing a time series database to store cylinder start data includes: mining and collecting historical data during the cylinder start process based on big data technology to obtain a cylinder start data set; constructing a time series database to store the cylinder start data set to realize storage and query of the cylinder start data.

[0008] Optional, Q in and Q out Satisfies the relationship: Where W is the mass of the gas in the cylinder and ρ is the steam density in the cylinder.

[0009] Optional, Q out Satisfies the relationship:

[0010] In the formula, Q N is the rated capacity of steam flowing out of the cylinder container, P N is the rated pressure of steam, and P is the steam pressure in the pressure cylinder.

[0011] Optionally, the steam pressure P satisfies the relationship: It is used to characterize the rate of change of steam density in the pressure cylinder to steam pressure. A temperature-related constant can be obtained through a preset steam parameter table.

[0012] Optionally, the steam turbine unit includes a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and the dynamic parameter optimization of the pressure cylinder startup dynamic model to obtain the pressure cylinder startup optimization model includes: counting the volume of the pipeline and the steam chamber between the steam valve and the high-pressure cylinder, the volume of the pipeline between the high-pressure cylinder and the medium-pressure cylinder, and the volume of the pipeline between the medium-pressure cylinder and the low-pressure cylinder in the steam turbine unit; based on the volume of the pipeline and the steam chamber, obtaining the steam volume effect time constant of the corresponding parts, so as to perform dynamic parameter optimization on the pressure cylinder startup dynamic model to obtain the pressure cylinder startup optimization model.

[0013] Optionally, before the pre-processing and modification of the control logic in the process of starting the pressure cylinder, it also includes: leading a pipe from the spare interface of the auxiliary steam manifold to the pipe in front of the high-pressure cylinder preheating adjustment electric door and adding an isolation door and a check valve as the preheating steam source for the medium and high-pressure cylinders of the steam turbine unit, and adding a drain manual door and a pneumatic door before and after the isolation door; adding a manual door and an electric door as a spare steam source for preheating the high-pressure cylinder; adding drain pipes and valves before and after the high-exhaust check valve to eliminate pipe vibration caused by poor drainage when cutting the cylinder.

[0014] Optionally, the pre-processing modification of the control logic during the cylinder startup process includes: modifying the pre-heating automatic control logic in the steam turbine unit to stabilize the cylinder warming steam source parameters and not be restricted by the boiler reheat steam cold section parameters; modifying the positive warming control logic of the high-pressure cylinder in the steam turbine unit to ensure that the cylinder metal temperature rises steadily and is heated evenly, and meets the high-pressure cylinder metal temperature requirements when the unit cuts the cylinder under load; modifying the cylinder cutting automatic control logic in the steam turbine unit to automatically control the high-pressure valve opening rate to ensure that the metal temperature rise rate and high exhaust temperature of each metal are not exceeded.

[0015] The technical solution provided by the embodiments of the present application may include the following beneficial effects: by constructing a time series database, a massive collection of cylinder start-up process data can be realized to provide solid data support, and by constructing a cylinder start-up dynamic model, the cylinder start-up process is theoretically guided and optimized to realize the monitoring of the cylinder start-up, and the cylinder start-up dynamic model is further optimized to obtain a more accurate cylinder start-up optimization model, to realize dynamic real-time monitoring of the cylinder start-up process, and at the same time, through pre-processing and transformation means, the cylinder start-up process is fully optimized, thereby reducing the cylinder start-up time and realizing the monitoring and early warning of start-up failures.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 The present invention is a flow chart showing a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an exemplary embodiment.

[0019] Figure 2 It is a steam volume diagram of a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an embodiment.

[0020] Figure 3 The present invention is a structural principle diagram of a steam turbine unit showing a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an embodiment.

[0021] Figure 4 The invention is a steam turbine unit transfer function block diagram of a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an embodiment. DETAILED DESCRIPTION

[0022] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0023] like Figure 1 Shown is a flow chart of a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an exemplary embodiment.

[0024] In step S101 , a time series database is constructed to store cylinder activation data.

[0025] In an optional embodiment, the time series database is mainly used to store relevant data of industrial production. The efficient access to time series data and the efficiency and quality of data processing determine the precision and accuracy of business applications.

[0026] In this optional embodiment, big data technology is used to mine and collect historical data during the cylinder pressure start-up process to obtain a cylinder pressure start-up data set. The data in the cylinder pressure start-up data set include fault data during each start-up process, monitoring data of high-pressure cylinder reverse warming, impulse forward warming, and cylinder cutting logic.

[0027] In this optional embodiment, a time series database is constructed to store the cylinder activation data set, and a data management engine integrating time series data collection, storage and analysis is provided to realize the storage and query of cylinder activation data. This satisfies the characteristics of light weight, high performance and easy use, connects to Hadoop and Spark ecosystems, and is suitable for the needs of high-speed writing and complex analysis and query of massive time series data in industrial Internet of Things applications.

[0028] In this optional embodiment, the overall performance of the time series database can achieve a write throughput of tens of millions of points per second, with low latency, and support filtering of TB-level data in hundreds of milliseconds. It supports a write speed of tens of millions of points per second for a single node, can handle disordered and duplicate data, and effectively manage trillions of data points. It supports SQL-like languages, JDBC standard APIs, and easy-to-use import / export tools. It has a high compression ratio of up to 1.5 bits / point, and supports lossy and lossless compression. It supports multiple service forms such as industrial control terminals, local controllers, and data centers, and provides a flexible deployment method that can be used out of the box.

[0029] like Figure 2 Shown is a steam volume diagram of an ultra-supercritical steam turbine unit intermediate pressure cylinder startup optimization method according to an embodiment.

[0030] In step S102, a cylinder activation dynamic model is constructed based on the cylinder activation data.

[0031] The dynamic model of cylinder start-up is constructed based on the cylinder start-up data. The dynamic model of cylinder start-up is constructed based on the cylinder start-up data and satisfies the relationship:

[0032]

[0033] In the formula, Q in is the flow rate of water vapor into the cylinder, Q out is the flow rate of steam out of the cylinder, s is the differential operator with respect to time, T V It represents the time constant of steam volume effect, and V is the volume of the pressure cylinder.

[0034] Among them, Q in and Q out Satisfies the relationship:

[0035]

[0036] Where W is the mass of the gas in the cylinder and ρ is the steam density in the cylinder.

[0037] Q out Satisfies the relationship:

[0038]

[0039] In the formula, Q N is the rated capacity of steam flowing out of the cylinder container, P N is the rated pressure of steam, and P is the steam pressure in the pressure cylinder.

[0040] The steam pressure P satisfies the relationship:

[0041]

[0042] This formula is used to characterize the rate of change of steam density in the pressure cylinder to steam pressure, and a temperature-related constant can be obtained through a preset steam parameter table.

[0043] In an optional embodiment, the steam turbine unit includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, and the dynamic behavior of the steam turbine mainly depends on the volume effect of the steam engine cylinder in the steam turbine unit. Expression (1) can be obtained by performing Laplace transformation on expressions (2), (3) and (4).

[0044] In this optional embodiment, for the steam volume effect time constant T VWhen the steam inlet flow rate of the volume suddenly increases or decreases, the steam outlet flow rate cannot increase or decrease immediately because the pressure of the volume cannot change suddenly, resulting in the change of the steam outlet flow rate lagging behind the change of the steam inlet flow rate.

[0045] In step S103, the dynamic parameters of the cylinder activation dynamic model are optimized to obtain the cylinder activation optimization model.

[0046] like Figure 3 , which is a structural principle diagram of a steam turbine unit according to an embodiment of a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit.

[0047] In an optional embodiment, a large steam turbine has multiple cylinders driving a generator. These cylinders can be divided into high-pressure cylinders HP, medium-pressure cylinders IP and low-pressure cylinders LP according to the pressure of the working steam. In order to improve thermal efficiency, modern steam turbines also have intermediate reheating links.

[0048] like Figure 3 As shown, the high-temperature and high-pressure steam from the boiler enters the high-pressure cylinder through the valve control room. The steam flowing out of the high-pressure cylinder is sent to the intermediate reheater for heating, and the heated steam enters the medium-pressure cylinder. The steam flowing out of the medium-pressure cylinder directly enters the low-pressure cylinder through the connecting pipe. It should be noted that the three parts of the guide pipe and steam chamber between the steam valve and the high-pressure cylinder, the part between the high-pressure cylinder and the medium-pressure cylinder, and the connecting pipe between the medium-pressure cylinder and the low-pressure cylinder all have a certain volume. Therefore, the volume of the pipe and steam chamber between the steam valve and the high-pressure cylinder, the volume of the pipe between the high-pressure cylinder and the medium-pressure cylinder, and the volume of the pipe between the medium-pressure cylinder and the low-pressure cylinder in the steam turbine unit are calculated, and the steam volume effect time constants of the three are recorded as T CH , T RH , T CO .

[0049] Furthermore, T CH The approximate time is between 0.2 and 0.3 seconds, T RH The duration of the intermediate heating stage is relatively long, generally 5 to 10 seconds. CO At about 0.5s; the output mechanical torque of the turbine rotor is proportional to the steam flow at the nozzle, that is, Q out In addition, the industry generally believes that the intake flow of the high-pressure cylinder is proportional to the valve opening μ. The mechanical power proportional coefficient of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder is recorded as F HP 、F IP 、F LP , and the mechanical power proportional coefficient of the three is 1, so the dynamic parameters of the cylinder start dynamic model can be optimized to obtain the cylinder start optimization model.

[0050] In this optional embodiment, the cylinder activation optimization model includes:

[0051]

[0052] Where μ = Q0, and T mH =F HP Q1, T mI =F IP Q2, T mL =F LP Q3, T m =T mH +T mI +T mL , F HP +F IP +F LP =1,P m =T m ω.

[0053] Where, T mH 、T mI , T mL are the output torques of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, respectively, T m is the total output torque, P m is the final output power of the steam turbine unit, Q0 is the flow rate of water vapor flowing into the high-pressure cylinder, Q1 is the flow rate of water vapor flowing out of the high-pressure cylinder, Q2 is the flow rate of water vapor flowing out of the medium-pressure cylinder, Q3 is the flow rate of water vapor flowing out of the low-pressure cylinder, and ω is the motor speed of the steam turbine unit. Figure 4 , is a steam turbine unit transfer function block diagram of a method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to an embodiment.

[0054] In this way, a more accurate cylinder startup optimization model is obtained by further optimizing the cylinder startup dynamic model, and the dynamic real-time monitoring of the cylinder startup process is realized by integrating the parameters of various components of the ultra-supercritical steam turbine unit during the cylinder startup process.

[0055] In step S104, the control logic in the process of starting the pressure cylinder is preprocessed and modified.

[0056] In an optional embodiment, before pre-processing and modifying the control logic during the cylinder startup process, the high-pressure cylinder preheating air source can be modified first, specifically, a pipeline is led from the spare interface of the auxiliary steam manifold to the pipeline in front of the high-pressure cylinder preheating adjustment electric door, and an isolation door and a check valve are added as the high-pressure cylinder preheating steam source in the steam turbine unit, and a drain manual door and a pneumatic door are added before and after the isolation door; a manual door and an electric door are added from the original reheat steam cold section to the high-pressure cylinder reverse warming electric door as a high-pressure cylinder preheating standby steam source; and drain pipes and valves are added before and after the high-discharge check valve to eliminate pipeline vibration caused by poor drainage when cutting cylinders.

[0057] In an optional embodiment, the preheating automatic control logic in the steam turbine unit can be modified to make the cylinder warming steam source parameters stable and not limited by the parameters of the boiler reheat steam cold section; the preheating regulating door is automatically controlled to control the metal temperature rise rate to 1°C / min; to improve the cylinder warming effect, the first stage metal temperature target of the high-pressure cylinder is changed from 150°C to 180°C. After the preheating is completed, the cylinder is sealed. The preheating control is realized by modifying the DCS control configuration logic.

[0058] Furthermore, the preheating input needs to meet the conditions, otherwise it should be locked. For example, these conditions are:

[0059] (1) Turn the turbine to a speed of 1-2 rpm;

[0060] (2) The first stage metal temperature of the high pressure inner cylinder is less than 180°C;

[0061] (3) Auxiliary steam pressure is > 0.5MPa, and steam temperature superheat is > 28°C;

[0062] (4) The high pressure exhaust check valve is in the closed state, and the reheater (after high pressure bypass) pressure is ≥ 0.3MPa;

[0063] (5) The drain valve on the first stage extraction pipeline is open, and the drain valve on the cold stage reheat pipeline is fully opened;

[0064] (6) Condenser pressure <13.2kPa.

[0065] The reverse heating adjustment door can be opened only after all the above conditions are met. Otherwise, the heating pipe will not open or close even if the adjustment door is opened manually.

[0066] In an optional embodiment, the positive heating control logic of the high-pressure cylinder in the steam turbine unit is modified to ensure that the metal temperature of the cylinder rises steadily and is heated evenly, and the metal temperature requirement of the high-pressure cylinder is met when the unit cuts off the cylinder under load.

[0067] Furthermore, the positive heating input needs to meet the conditions, otherwise it should be locked. For example, these conditions are:

[0068] (1) The first stage metal temperature of the high pressure inner cylinder is between 150℃ and 320℃;

[0069] (2) The high-pressure main steam valve (MSV) is in the closed state (the main steam used for preheating enters the steam chamber of the regulating valve through the pre-start valve of the main steam valve), and the pre-start valve of the main steam valve is in the open state.

[0070] In an optional embodiment, the automatic control logic of cylinder cutting in the steam turbine unit can be modified to automatically control the opening rate of the high-pressure valve to ensure that the temperature rise rate of each metal and the high-pressure exhaust temperature do not exceed the limit. Specifically:

[0071] (1) Click the "Cylinder Cut" button to switch to the valve position control mode, automatically set the high-pressure valve position to the preset value, and automatically control the high-pressure valve opening rate to ensure that the temperature rise rate of each metal and the high-pressure exhaust temperature do not exceed the limit. At this time, the high-pressure bypass pressure reducing valve should automatically close to stabilize the main steam pressure, and the low-pressure bypass pressure reducing valve should automatically close to stabilize the reheat steam pressure;

[0072] (2) When the total valve position command reaches the preset value, the pressure before the high-discharge check valve is greater than the pressure after the high-discharge bypass valve. The high-discharge check valve opens and the high-discharge ventilation valve is closed. At this time, the high-discharge temperature should drop.

[0073] (3) During the cylinder cutting process, the load should be maintained between 50-70MW, and the cylinder cutting time (from the start of the high-pressure valve opening to the opening of the high-discharge check valve) should be ≤2min;

[0074] (4) During the load increase process, the high and low pressure bypasses are gradually closed in automatic mode to maintain the main and reheat steam pressures stable and ensure a steady increase in load.

[0075] (5) When the load = 99MW, the low bypass pressure reducing valve is automatically fully closed, and the high bypass pressure reducing valve continues to be closed. After the high bypass pressure reducing valve is fully closed, the cylinder cutting conversion and load increase are completed.

[0076] In step S105, the cylinder activation process after pre-processing and transformation is monitored for abnormalities to dynamically adjust the cylinder activation process.

[0077] In an optional embodiment, after starting the pressure cylinder, the obtained pressure cylinder starting optimization model can be used to monitor abnormalities of the pressure cylinder starting process after pretreatment and transformation to dynamically adjust the pressure cylinder starting process.

[0078] Furthermore, based on the analysis based on data models and expert experience models, a combination of qualitative and quantitative methods can be used to monitor and diagnose abnormalities in system operation, conduct parameter warning and fault warning startup status evaluation, monitor and record equipment operating status and process parameters, issue alarms for abnormal conditions, form out-of-limit records, and establish unit startup files and unit life management files.

[0079] In this optional embodiment, the rules of equipment operation data can be mined to analyze the characteristics of unit failure and data change rules. Big data technology is used to mine and utilize historical failure data to form a reserve and supplement of professional knowledge.

[0080] Among them, in order to further optimize the dynamic parameters of the steam turbine process, the adjustment control curves under various parameters can be exercised based on the simulation control model through algorithms such as Monte Carlo tree search, and the control time, overshoot and other indicators can be evaluated and calculated. The optimal startup adjustment parameters can be found through optimization algorithms such as ant colony algorithm and genetic algorithm.

[0081] In this optional embodiment, fault warning, expert database and knowledge base can be established through unit startup status diagnosis and fault analysis, avoiding problems such as large fluctuations in unit load and increased high-exhaust temperature during cylinder cutting, thereby ensuring safe operation of the unit.

[0082] It should be understood that the features of some embodiments of the various applications described herein may be combined with each other, unless specifically stated otherwise.

[0083] Although terms such as "first", "second", and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Instead, these terms are only used to distinguish one component, part, region, layer, or section from another component, part, region, layer, or section. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description herein, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or diagram. Any aspect or design described herein as "exemplary" is not necessarily to be understood as being advantageous over other aspects or designs. Instead, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or".

[0086] Likewise, although the present application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. With particular regard to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if not structurally equivalent to the disclosed structures.

[0087] Additionally, while particular features of the present application may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and advantageous for any given or particular application.

[0088] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application, and the specification and embodiments are only considered as exemplary.

[0089] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A method for optimizing the startup of an intermediate pressure cylinder of an ultra-supercritical steam turbine unit, characterized in that: include: Build a time series database to store cylinder activation data; A cylinder activation dynamic model is constructed according to the cylinder activation data, and the cylinder activation dynamic model constructed by the cylinder activation data satisfies the relationship: In the formula, Q in is the flow rate of water vapor into the cylinder, Q out is the flow rate of steam out of the cylinder, s is the differential operator with respect to time, T V It represents the time constant of steam volume effect, V is the volume of the pressure cylinder; Optimizing dynamic parameters of the cylinder start-up dynamic model to obtain a cylinder start-up optimization model; Carry out pre-processing and transformation of the control logic during the cylinder start-up process; The pressure cylinder is started, and based on the pressure cylinder starting optimization model, the pressure cylinder starting process after pretreatment and transformation is monitored for abnormalities to dynamically adjust the pressure cylinder starting process.

2. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 1, characterized in that: The constructing of a time series database to store cylinder activation data comprises: Based on big data technology, historical data of the cylinder start process is mined and collected to obtain the cylinder start data set; A time series database is constructed to store the cylinder activation data set, so as to realize storage and query of the cylinder activation data.

3. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 1, characterized in that: The Q in and Q out Satisfies the relationship: Where W is the mass of the gas in the cylinder and ρ is the steam density in the cylinder.

4. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 3, characterized in that: The Q out Satisfies the relationship: In the formula, Q N is the rated capacity of steam flowing out of the cylinder container, P N is the rated pressure of steam, and P is the steam pressure in the pressure cylinder.

5. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 4, characterized in that: The steam pressure P satisfies the relationship: It is used to characterize the rate of change of steam density in the pressure cylinder to steam pressure. A temperature-related constant can be obtained through a preset steam parameter table.

6. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 1, characterized in that: The steam turbine unit includes a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and the dynamic parameter optimization of the cylinder startup dynamic model to obtain the cylinder startup optimization model includes: Count the volume of the pipes and steam chambers between the steam valve and the high-pressure cylinder, the volume of the pipes between the high-pressure cylinder and the medium-pressure cylinder, and the volume of the pipes between the medium-pressure cylinder and the low-pressure cylinder in the steam turbine unit; Based on the volume of the pipeline and the steam chamber, the steam volume effect time constant of the corresponding part is obtained to optimize the dynamic parameters of the cylinder startup dynamic model to obtain the cylinder startup optimization model.

7. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 6, characterized in that: Before the pre-processing and transformation of the control logic in the process of starting the pressure cylinder, the method further includes: Lead a pipeline from the spare interface of the auxiliary steam header to the pipeline in front of the electric door for preheating adjustment of the high-pressure cylinder and add an isolation door and a check valve as the preheating steam source for the medium and high-pressure cylinders of the steam turbine unit, and add a manual drain door and a pneumatic door before and after the isolation door; Add a manual door and an electric door as a backup steam source for preheating the high-pressure cylinder; Drain pipes and valves are added before and after the high-discharge check valve to eliminate pipe vibration caused by poor drainage when cutting the cylinder.

8. The method for optimizing the startup of the intermediate pressure cylinder of an ultra-supercritical steam turbine unit according to claim 1, characterized in that: The pre-processing and transformation of the control logic in the process of starting the pressure cylinder includes: The preheating automatic control logic in the steam turbine unit is modified to make the parameters of the cylinder warming steam source stable and not limited by the parameters of the boiler reheat steam cold section; The positive heating control logic of the high-pressure cylinder in the steam turbine unit is modified to ensure that the metal temperature of the cylinder rises steadily and is heated evenly, and the metal temperature requirement of the high-pressure cylinder is met when the unit cuts off the cylinder under load; The automatic control logic of cylinder cutting in the steam turbine unit is modified to automatically control the opening rate of the high-pressure valve to ensure that the temperature rise rate of each metal and the high exhaust temperature do not exceed the limit.

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