CN104775856A - Rapid starting control method and rapid starting control system for steam turbine of combined cycle generating unit - Google Patents
Rapid starting control method and rapid starting control system for steam turbine of combined cycle generating unit Download PDFInfo
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Abstract
The application discloses a rapid starting control method and a rapid starting control system for a steam turbine of a combined cycle generating unit. Because the starting speed of the steam turbine is constrained by the stress level of a rotor of the steam turbine, under the condition that the stress of the rotor does not exceed a maximum stress range, the starting curve of the steam turbine is adjusted according to real-time stress received by the rotor, the heating time of the steam turbine is shortened, moreover, the steam turbine is heated under low load, consequently, the steam turbine is started rapidly, and the purpose of generating more electricity and saving energy in the process of starting is achieved.
Description
Technical field
The application relates to integrated gas-steam combined cycle power plant field, more particularly, relates to a kind of combined cycle generating unit steam turbine quick startup control method and device.
Background technique
Integrated gas-steam combined cycle power plant technology is gradually ripe, and the further exploitation of natural gas resource in world wide, gas turbine and combined cycle generation thereof the status in electric power system is improved gradually.The installation that gas turbine possesses is fast, take up an area less, start and stop are rapid, safe and reliable, also enjoy favor by series of advantages such as water are few.Can predict, along with the adjustment of China's energy resource structure, environmental requirement increasingly stringent, combined cycle is as the generation technology of a kind of advanced person, and the status in China's electrical production industry is also improved day by day.
In current Joint cycle generating system, gas turbine cold start can reach rated load in 2 ~ 20min, and steam turbine cold start is to needing 95min at full capacity, gas turbine reaches rated load and steam turbine and is also in warm-up period and reaches about 1.5 hours.In this process, a big chunk exhaust of gas turbine directly can be discharged by bypath system, and the steam of exhaust heat boiler also drains into vapour condenser through by-pass valve, causes huge energy loss.
Summary of the invention
In view of this, the application provides a kind of combined cycle generating unit steam turbine quick startup control method and device, to start steam turbine fast, reaches the object of energy saving.
To achieve these goals, the existing scheme proposed is as follows:
A kind of combined cycle generating unit steam turbine quick startup control method, comprising:
Obtain structure and the service data of steam turbine, and set up rotor FEM (finite element) model according to described structure and service data;
Utilize described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determine the position of monitoring key point;
Monitor the STRESS VARIATION of key point described in Real-Time Monitoring, and revise according to the start up curve of STRESS VARIATION to steam turbine.
Preferably, describedly set up rotor FEM (finite element) model according to described structure and service data, comprising:
ANSYS software is utilized to set up turbine rotor FEM (finite element) model.
Preferably, describedly utilize described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determine the position of monitoring key point, comprising:
Adopt the plane55 unit of plane axial symmetry two dimension four nodes to carry out stress and strain model, and then carry out calculating to rotor temperature field and analyze;
According to the result of calculation of rotor temperature field, carry out thermal-stress coupling with ANSYS, carry out startup Stress calculation and the analysis of each start operating performance further, according to Von Mises criterion, calculated stress is pressed fourth strength theory by centrifugal stress and thermal stress and is synthesized;
Using position maximum for rotor stress as monitoring key point position.
Preferably, describedly carry out calculating and analyze to rotor temperature field, comprising:
According to the governing stage place cylinder temperature under different start up curve, calculate the initial temperature field of rotor;
According to initial temperature field and steam, transient state temperature field is calculated to the coefficient of heat transfer of rotor surface, and temperature field is analyzed.
Preferably, described in, according to Von Mises criterion, calculated stress is pressed fourth strength theory by centrifugal stress and thermal stress and is synthesized, and comprising:
According to formula
Calculate rotor stress field;
Wherein, σ
∞ mfor Von Mises stress; Subscript y, θ, r represent axially respectively, tangential and radial stress;
τ
ryrepresent shearing stress.
Preferably, monitor the STRESS VARIATION of key point described in described Real-Time Monitoring, comprising:
According to rotor 15 layers of hierarchical mode, work out online Stress calculation program, calculate the stress of monitoring key point.
Preferably, describedly work out online Stress calculation program according to rotor 15 layers of hierarchical mode, calculate the stress of monitoring key point, comprising:
Described online Stress calculation program is according to the vapor pressure measured, temperature, load and rotating speed, the temperature field of monitoring surface is calculated in real time according to certain time interval, and then calculate the thermal stress of rotor, go out the mechanical stress of rotor again according to calculation of parameter such as rotating speed and monitoring surface structures, both synthesize total rotor stress.
Preferably, described in be organized in uniaxial stress computer program after, comprising: obtain online Stress calculation parameter;
Described parameter comprises interval computing time, the coefficient of heat transfer of heat transfer, specific heat capacity, linear expansion coefficient, Young's modulus and stress nargin coefficient.
Preferably, the online Stress calculation parameter of described acquisition, comprising:
According to the geometrical construction at monitoring position, revise according to result of finite element, calculate the stress concentration factor at rotor monitoring position.
A kind of combined cycle generating unit steam turbine starts control gear fast, comprising:
FEM (finite element) model sets up module, for obtaining structure and the service data of steam turbine, and sets up rotor FEM (finite element) model according to described structure and service data;
Monitoring key point determination module, for utilizing described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determines the position of monitoring key point;
Stress field Real-Time Monitoring unit, for monitoring the STRESS VARIATION of key point described in Real-Time Monitoring, and revises according to the start up curve of STRESS VARIATION to steam turbine.
Through as shown from the above technical solution, the application discloses a kind of combined cycle generating unit steam turbine quick startup control method and device.Toggle speed due to steam turbine is that the stress suffered by its rotor determines, thus the present invention is not when rotor stress exceeds maximum stress scope, according to the start up curve of the Stress relief steam turbine of rotor, shorten the warm-up period of steam turbine, carry out low-load warming-up, thus start steam turbine fast, reach the object of energy saving.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 shows the schematic flow sheet of an embodiment of a kind of combined cycle generating unit steam turbine of the present invention quick startup control method;
Fig. 2 shows the structural representation that a kind of combined cycle generating unit steam turbine of the present invention starts an embodiment of control gear fast.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The schematic flow sheet of an embodiment of a kind of combined cycle generating unit steam turbine of the present invention quick startup control method is shown see Fig. 1.
101: the structure and the service data that obtain steam turbine, and turn according to described structure and service data foundation
Sub-FEM (finite element) model.
According to the structure of steam turbine, ANSYS is utilized to set up turbine rotor two-dimensional axial symmetric FEM (finite element) model
102: utilize described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determine the position of monitoring key point.
The unit plane55 grid division of plane axial symmetry two dimension four nodes is adopted during accounting temperature field, thermal-structural coupling analysis is adopted during calculated stress field, the structural analysis unit plane182 corresponding with thermal analyses unit carrys out discrete model, the grid of two computational process rotors is just the same, and just the attribute of unit is different.
In addition according to turbine rotor operationally density of heat flow rate and energy transferring feature, rotor thermal boundary condition is done following setting.
(1) rotor left and right end face is the truncation surface of integral rotor outside cylinder, and the coefficient of heat transfer between itself and air is very little, therefore makes insulation in FEM (finite element) calculation.
(2) insulation is made in the calculation in border, center.
(3) outer surface of axle can be used as the third boundary condition of the known coefficient of heat transfer and vapor (steam) temperature.
(4) rotor left and right bearing place, due to lubricant oil cooling action, is all taken as 70 DEG C, as First Boundary Condition in whole computational process.
The calculating of rotor temperature field is divided into the calculating of initial temperature field and the calculating of transient state temperature field.First according to the governing stage place cylinder temperature under different start up curve, calculate the initial temperature field of rotor, then according to initial temperature field and steam, transient state temperature field is calculated to the coefficient of heat transfer of rotor surface, and temperature field is analyzed, the temperature distribution in any time rotor cross section can be calculated by ANSYS.Rotor thermal stress FEM (finite element) calculation adopts thermal-stress coupling analytic method, considers the cross action of temperature field and stress field and influence each other (coupling) in finite element analysis process.
Because rotor structure is comparatively complicated, stress concentration portion position is many, and steam parameter variance ratio at different levels in start-up course is inconsistent, and therefore in start-up course, the position of stress maximum value is not fixed on certain special position, but changes to some extent along with start-up course.Can draw according to Stress Map, start and mainly appear at the place such as fillet and medium pressure grade fillet before and after governing stage early stage, after set steady, the position that stress maximum value occurs concentrates on time final stage place, this is main because centrifugal force is larger herein, after stable operation, thermal stress diminishes, and what play a major role in combined stress is rotor centrifugal force.And then, to impose a condition and the distribution of patent stress field is determined to monitor key point according to above-mentioned.
It should be noted that, the stressing conditions of turbine rotor in real work is very complicated, and suffered stress belongs to multinomial stress.According to mechanics of materials fourth strength theory, when an object exists multinomial stress, determine its combined stress according to Mises criterion.But according to rotor actual loading situation, mainly there is axial stress and tangential stress (other stress are ignored) in rotor outer surface and center portion.Tangential stress comprises thermal stress and centrifugal stress, and axial stress only has thermal stress.So the synthesis of making a concerted effort for centrifugal stress and thermal stress.Need during calculating to calculate centrifugal stress and thermal stress, synthesize according to fourth strength theory after then obtaining axis and tangential stress by Directional Decomposition.
Wherein, described Von Mises criterion is:
103: the STRESS VARIATION of monitoring key point described in Real-Time Monitoring, and revise according to the start up curve of STRESS VARIATION to steam turbine.
According to rotor 15 layers of hierarchical mode, be organized in uniaxial stress computer program, calculate the stress of monitoring key point.
Wherein, in online Stress calculation program, Selecting parameter comprises interval computing time, the coefficient of heat transfer of heat transfer, specific heat capacity, linear expansion coefficient, Young's modulus and stress nargin coefficient.
Wherein, 1) time lag of online computing system is according to Thermal Analysis, in order to meet stability condition, considering the computational speed of computer and the temperature difference heat conduction of rotor, getting △ τ=10 second.
2) coefficient of heat transfer conducted heat is:
k＝65-0.26125×t+0.00136×t2-3.60417×10-6×t3+4.45833×10-9×t4-2.0833×10-12×t5
3) polynomial fitting of specific heat is:
cp＝735-1.8675×t+0.0084×t2-1.425×10-5×t3+9.58333×10-9×t4
4) linear expansion coefficient described in, (× 10-6/ DEG C), polynomial fitting is:
β＝10.23714+0.0254×t-9.89167×10-5×t2+2.28106×10-7×t3-2.62879×10-10×t4+1.16667×10-13×t5
5) Young's modulus (× 103MPa), polynomial fitting is:
E＝212.16187+0.11997×t-0.00194×t2+8.88535×10-6×t3-1.8131×10-8×t4+1.31984×10-11×t5
In formula: t-material temperature, DEG C
6) thermal stress concentration factor is the concentration factor calculating rotor monitoring position according to the monitoring geometrical construction at position, result of finite element, and in addition experimental evaluation analysis draws.
Concrete, described online Stress calculation program is according to the vapor pressure measured, temperature, load and rotating speed, the temperature field of monitoring surface is calculated in real time according to certain time interval, and then calculate the thermal stress of rotor, go out the mechanical stress of rotor again according to calculation of parameter such as rotating speed and monitoring surface structures, both synthesize total rotor stress.
The structural representation that a kind of combined cycle generating unit steam turbine of the present invention starts an embodiment of control gear is fast shown see Fig. 2.
As shown in Figure 2, FEM (finite element) model sets up module 1, for obtaining structure and the service data of steam turbine, and sets up rotor FEM (finite element) model according to described structure and service data;
Monitoring key point determination module 2, for utilizing described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determines the position of monitoring key point;
Stress Real-Time Monitoring unit 3, for monitoring the STRESS VARIATION of key point described in Real-Time Monitoring, and revises according to the start up curve of STRESS VARIATION to steam turbine.
Optional, in other embodiments of the invention, this device also comprises stress identifying unit 4, for judging that whether the stress of rotor is beyond default stress.If so, then output alarm signal.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or control panel, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a combined cycle generating unit steam turbine quick startup control method, is characterized in that, comprising:
Obtain structure and the service data of steam turbine, and set up rotor FEM (finite element) model according to described service data;
Utilize described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determine the position of monitoring key point;
Monitor the change of stress field of key point described in Real-Time Monitoring, and revise according to the start up curve of change of stress field to steam turbine.
2. method according to claim 1, is characterized in that, the described structure according to described steam turbine and service data set up rotor FEM (finite element) model, comprising:
ANSYS software is utilized to set up turbine rotor FEM (finite element) model.
3. the method according to right 1, is characterized in that, describedly utilizes described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determines the position of monitoring key point, comprising:
Adopt the plane55 unit of plane axial symmetry two dimension four nodes to carry out stress and strain model, and then carry out calculating to rotor temperature field and analyze;
According to the result of calculation of rotor temperature field, according to Von Mises criterion, calculated stress is pressed fourth strength theory by centrifugal stress and thermal stress and is synthesized, and carries out thermal-stress coupling, carry out startup Stress calculation and the analysis of each start operating performance further with ANSYS;
Using position maximum for rotor stress as monitoring key point position.
4. method according to claim 3, is characterized in that, describedly carries out calculating and analyze to rotor temperature field, comprising:
According to the governing stage place cylinder temperature under different start up curve, calculate the initial temperature field of rotor;
According to initial temperature field and steam, transient state temperature field is calculated to the coefficient of heat transfer of rotor surface, and temperature field is analyzed.
5. method according to claim 3, is characterized in that, described in, according to Von Mises criterion, calculated stress is pressed fourth strength theory by centrifugal stress and thermal stress and is synthesized, and comprising:
According to formula
Calculate rotor stress field;
Wherein, σ
∞ mfor Von Mises stress; Subscript y, θ, r represent axially respectively, tangential and radial stress;
τ
ryrepresent shearing stress.
6. method according to claim 1, is characterized in that, monitors the change of stress field of key point, comprising described in described Real-Time Monitoring:
According to rotor 15 layers of hierarchical mode, work out online Stress calculation program, calculate the stress field of monitoring key point.
7. method according to claim 6, is characterized in that, describedly works out online Stress calculation program according to rotor 15 layers of hierarchical mode, calculates the stress field of monitoring key point, comprising:
Described online Stress calculation program is according to the vapor pressure measured, temperature, load and rotating speed, the temperature field of monitoring surface is calculated in real time according to certain time interval, and then calculate the thermal stress of rotor, go out the mechanical stress of rotor again according to calculation of parameter such as rotating speed and monitoring surface structures, both synthesize total rotor stress.
8. method according to claim 6, is characterized in that, described in be organized in uniaxial stress computer program after, comprising: obtain online Stress calculation parameter;
Described parameter comprises interval computing time, the coefficient of heat transfer of heat transfer, specific heat capacity, linear expansion coefficient, Young's modulus and stress nargin coefficient.
9. method according to claim 8, is characterized in that, the online Stress calculation parameter of described acquisition, comprising:
According to geometrical construction, the result of finite element at monitoring position, calculate the stress concentration factor at rotor monitoring position.
10. combined cycle generating unit steam turbine starts a control gear fast, it is characterized in that, comprising:
FEM (finite element) model sets up module, and structure and service data according to obtaining steam turbine set up rotor FEM (finite element) model;
Monitoring key point determination module, for utilizing described patent FEM (finite element) model to carry out computational analysis to the temperature field of turbine rotor and stress field, determines the position of monitoring key point;
Stress field Real-Time Monitoring unit, for monitoring the STRESS VARIATION of key point described in Real-Time Monitoring, and revises according to the start up curve of STRESS VARIATION to steam turbine.
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| CN106484954A (en) * | 2016-09-14 | 2017-03-08 | 华北电力大学 | A kind of Combined cycle gas-steam turbine start-up curve of generating unit on-line optimization method of adjustment |
| CN107035537A (en) * | 2017-04-28 | 2017-08-11 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN107330168A (en) * | 2017-06-14 | 2017-11-07 | 国网浙江省电力公司电力科学研究院 | A kind of steam turbine pitch quick closing valve emulation modelling method coupled based on machine net |
| CN109356675A (en) * | 2018-12-13 | 2019-02-19 | 浙江医药高等专科学校 | Feed pump turbine automatic starting control method |
| CN109829220A (en) * | 2019-01-23 | 2019-05-31 | 北京交通大学 | The multi- scenarios method calculation method of the Rotor's Transient Temperature of air-cooled steam turbine generator |
| CN109899118A (en) * | 2019-03-21 | 2019-06-18 | 上海电气电站设备有限公司 | A kind of control method of Steam Turbine start and stop |
| CN111428414A (en) * | 2020-04-01 | 2020-07-17 | 浙江大学 | Temperature field virtual reality real-time reconstruction method for monitoring service performance of steam turbine |
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Cited By (12)
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| CN106484954A (en) * | 2016-09-14 | 2017-03-08 | 华北电力大学 | A kind of Combined cycle gas-steam turbine start-up curve of generating unit on-line optimization method of adjustment |
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| CN107035537A (en) * | 2017-04-28 | 2017-08-11 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN107035537B (en) * | 2017-04-28 | 2018-09-25 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN107330168A (en) * | 2017-06-14 | 2017-11-07 | 国网浙江省电力公司电力科学研究院 | A kind of steam turbine pitch quick closing valve emulation modelling method coupled based on machine net |
| CN107330168B (en) * | 2017-06-14 | 2020-07-17 | 国网浙江省电力公司电力科学研究院 | Turbine valve regulation quick closing simulation modeling method based on machine network coupling |
| CN109356675A (en) * | 2018-12-13 | 2019-02-19 | 浙江医药高等专科学校 | Feed pump turbine automatic starting control method |
| CN109356675B (en) * | 2018-12-13 | 2021-10-22 | 浙江医药高等专科学校 | Automatic starting control method for water feeding pump steam turbine |
| CN109829220A (en) * | 2019-01-23 | 2019-05-31 | 北京交通大学 | The multi- scenarios method calculation method of the Rotor's Transient Temperature of air-cooled steam turbine generator |
| CN109899118A (en) * | 2019-03-21 | 2019-06-18 | 上海电气电站设备有限公司 | A kind of control method of Steam Turbine start and stop |
| CN109899118B (en) * | 2019-03-21 | 2021-11-19 | 上海电气电站设备有限公司 | Control method for starting and stopping steam turbine set |
| CN111428414A (en) * | 2020-04-01 | 2020-07-17 | 浙江大学 | Temperature field virtual reality real-time reconstruction method for monitoring service performance of steam turbine |
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Application publication date: 20150715 |