CN107701245A - A kind of sliding pressure optimization of profile method of fired power generating unit steam turbine - Google Patents
A kind of sliding pressure optimization of profile method of fired power generating unit steam turbine Download PDFInfo
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- CN107701245A CN107701245A CN201710763165.8A CN201710763165A CN107701245A CN 107701245 A CN107701245 A CN 107701245A CN 201710763165 A CN201710763165 A CN 201710763165A CN 107701245 A CN107701245 A CN 107701245A
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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
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Abstract
The invention belongs to fired power generating unit field, a kind of sliding pressure optimization of profile method of fired power generating unit steam turbine is disclosed, including：Main steam flow is determined, keeps the main steam flow constant, then changes main steam pressure, obtains the unit heat consumption corresponding to multiple different main steam pressures difference under main steam flow；The minimum unit heat consumption under main steam flow is selected, main steam pressure corresponding to the minimum unit heat consumption is the optimal main steam pressure under the main steam flow；Change the main steam flow, obtain optimal main steam pressure corresponding to different main steam flows difference；According to optimal main steam pressure corresponding to different main steam flows difference, the curve of main steam flow and optimal main steam pressure is obtained, the sliding pressure curve as fired power generating unit；The present invention can more accurately instruct the economy of fired power generating unit, optimization operation.
Description
Technical field
The invention belongs to fired power generating unit technical field, more particularly to a kind of sliding pressure optimization of profile side of fired power generating unit steam turbine
Method.
Background technology
The operational factor of fired power generating unit has a great impact to its economic performance, and the optimization currently for fired power generating unit is run
Method mainly has two kinds, and the first is the sliding pressure optimization of profile for main steam pressure, and second is for the cold of exhaust steam pressure
End optimization.
Under the different operating modes of fired power generating unit, main steam pressure remains that rated pressure is referred to as fixed pressure operation, main steam
Pressure changes referred to as sliding pressure operation with operating mode, and conventional sliding pressure operation curve is shown in Fig. 1.
Conventional sliding pressure optimization of profile is that unit load and optimal main steam pressure link together, it should be pointed out that
It is that the conventional sliding pressure optimization of profile on the basis of unit load does not consider influence of the exhaust steam pressure to system.In fact, due to
The change of the factors such as ambient temperature, circulating water flow, unit exhaust steam pressure can vary widely, if exhaust steam pressure changes
10kPa, the acting enthalpy drop of unit working medium will change 9%, and unit load will also change 9%, but the change of exhaust steam pressure is to the work
Optimal main steam pressure under condition does not influence but, i.e., optimal main steam pressure is to correspond with flow under the operating mode, but with
Load is not one-to-one.
The content of the invention
It is the shortcomings that for above-mentioned prior art, bent it is an object of the invention to provide a kind of sliding pressure of fired power generating unit steam turbine
Line optimization method, the sliding pressure optimization of profile method of the fired power generating unit of routine is improved, can more accurately instruct thermoelectricity
The economy of unit, optimization operation.
To reach above-mentioned purpose, the present invention, which adopts the following technical scheme that, to be achieved.
A kind of sliding pressure optimization of profile method of fired power generating unit steam turbine, methods described include：
Step 1, main steam flow is determined, keeps the main steam flow constant, then changes main steam pressure, obtain
Unit heat consumption corresponding to multiple different main steam pressures difference under the main steam flow；
Step 2, the minimum unit heat consumption under the main steam flow, main steam corresponding to the minimum unit heat consumption are selected
Pressure is the optimal main steam pressure under the main steam flow；
Step 3, change the main steam flow, be repeated in performing step 1 and step 2, obtain different main steam flows
Optimal main steam pressure corresponding to respectively；
Step 4, according to different main steam flows respectively corresponding to optimal main steam pressure, obtain main steam flow with it is optimal
The curve of main steam pressure, the sliding pressure curve as fired power generating unit steam turbine.
The characteristics of technical solution of the present invention and further it is improved to：
(1) main steam flow is determined in step 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0, main steam pressure Pm0, exhaust steam pressure Pz0And temperature T0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode, Pz1Represent the steam discharge pressure under any operating mode
Power, T1Represent the temperature under any operating mode.
(2) main steam flow is determined in step 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0, main steam pressure Pm0And temperature T0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode, T1Represent the temperature under any operating mode.
(3) main steam flow is determined in step 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0With main steam pressure Pm0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode.
The beneficial effect of technical solution of the present invention：
1st, in fired power generating unit normal operation, exhaust steam pressure would generally by ambient temperature, circulating water flow etc. because
Element influence and vary widely.Conventional techniques determine main steam pressure on the basis of load, if back pressure slightly becomes
Change, unit is not run under optimal main steam pressure.Technical solution of the present invention has taken into full account exhaust steam pressure to unit performance
Influence, the shortcomings that overcoming conventional scheme, on the basis of main steam flow, can make under any back pressure of unit, loading condiction
Run under optimal main steam pressure, if exhaust steam pressure changes 10kPa, more conventional technology can reduce heat consumption 30kJ/KWh.
2nd, because main steam pressure temperature is higher, unit main steam flow among actual motion can not direct measurement obtain
Arrive, cause the above-mentioned improved sliding pressure operation optimization of profile method on the basis of main steam flow to be difficult to carry out.The technology of the present invention
Scheme (can be adjusted the parameter easily measured by the sliding pressure optimization of profile method for not staying gale formula principle application enhancements
Stage pressure, governing stage temperature and exhaust steam pressure) by not staying gale formula that main steam flow is calculated.This method is simply real
With being easy to implement in experiment and operation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is conventional sliding pressure operation curve synoptic diagram, wherein, abscissa is power, and unit MW, ordinate is main steam
Pressure, units MPa；
Fig. 2 is main steam pressure and unit heat consumption rate variation relation schematic diagram under certain operating mode, wherein, abscissa is main steam
Pressure, units MPa, heat consumption rate after ordinate amendment, unit kJ/kWh；
Fig. 3 is the sliding pressure optimization of profile method flow schematic diagram of fired power generating unit steam turbine provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The operational factor of fired power generating unit has a great impact to its economic performance, and the optimization currently for fired power generating unit is run
Method mainly has two kinds, and the first is the sliding pressure optimization of profile for main steam pressure, and second is for the cold of exhaust steam pressure
End optimization.The embodiment of the present invention is improved to existing conventional fired power generating unit sliding pressure optimization of profile method, can be more accurate
Instruct fired power generating unit economy, optimization operation.
It is mainly shown as the sliding pressure optimization of profile method of routine：When unit load gradually reduces (rise), pass through
Reduce (rise) main steam pressure and make it that Unit Economic performance is optimal all the time.Its principle is, under a certain operating mode, it is assumed that acting stream
Measure miAnd heat absorption flow mjIt is constant, when unit main steam pressure reduces, high pitch aperture relative increase can be caused, reduce unit
Enter vapour restriction loss, steam turbine internal efficiency ηiIncrease, causes unit working power W to be greatly improved than fixed pressure operation, follows
Ring thermal efficiency ηtIt is improved trend；Main steam pressure is low when on the other hand, due to sliding pressure, and main steam temperature is constant, unit work
The heat absorption enthalpy of matter rises Δ hjIncrease, the caloric receptivity Q increases of unit in the boiler, thermal efficiency of cycle ηtThere is downward trend；When unit is done
When work(power increment is more than boiler caloric receptivity, thermal efficiency of cycle ηtCan integrally it improve, the method using reduction main vapour pressure is ratio
More economical.
In formula：W is the power of the assembling unit (or being unit load), unit kW；
Q recepts the caloric for unit, unit kJ/s；
mi、mjRespectively acting and the flow that absorbs heat, unit kg/s；
ηt、ηiRespectively unit efficiency and steam turbine internal efficiency；
Δhi、ΔhjIt is the acting enthalpy drop and heat absorption enthalpy liter, unit kJ/kg of unit working medium respectively；
In formula：HRtTo test heat consumption rate, unit kJ/kWh；
HmsFor main specific steam enthalpy, unit kJ/kg；
HfwFor the specific enthalpy that feeds water, unit kJ/kg；
HhrhFor reheat heat specific steam enthalpy, unit kJ/kg；
HcrhFor cold reheated steam specific enthalpy, unit kJ/kg；
HrhspFor reheater desuperheating water specific enthalpy, unit kJ/kg；
HshspFor desuperheating water of superheater specific enthalpy, unit kJ/kg；
GmsFor main steam flow, unit t/h；
GfwFor the specific enthalpy that feeds water, unit t/h；
GhrhFor reheat heat specific steam enthalpy, unit t/h；
GcrhFor cold reheated steam specific enthalpy, unit t/h；
GrhspFor reheater desuperheating water specific enthalpy, unit t/h；
GshspFor desuperheating water of superheater specific enthalpy, unit t/h；
In engineer applied, conventional heat consumption rate represents the thermal efficiency of cycle η of unitt, thermal efficiency of cycle ηtMore high then unit
Heat consumption rate is lower, although because dimension has difference, both are equivalent (hereafter unifying to be expressed using heat consumption).
Main steam pressure is shown in Fig. 2 with unit heat consumption rate variation relation under certain operating mode.Sliding pressure optimization of profile main purpose is logical
A series of experiments is crossed to determine the optimal sliding pressure operation pressure under different operating modes.Conventional sliding pressure optimization of profile is by unit load
Linked together with optimal main steam pressure, its specific implementation method is：1st, different main steam pressures is selected under a certain load
Power carries out economy Comparability test, calculates the unit heat under same load difference main steam pressure respectively according to test data
Consumption.2nd, main steam pressure corresponding when heat consumption is minimum under the load is selected, the optimal main steam pressure being considered as under the load.3、
Change load, repeat 1,2 steps, obtain the optimal main steam pressure under different load.4th, by obtained load and optimal main steaming
Steam pressure relation is nested into the control system of fired power generating unit, then after make it that unit load is stable, its main steam pressure is always
Its corresponding optimal value.
It is pointed out that the conventional sliding pressure optimization of profile on the basis of unit load does not consider exhaust steam pressure to system
Influence, that is, have ignored Δ h in formula (1)iInfluence of the change of (the acting enthalpy drop of unit working medium) to system power and efficiency.
Under a certain operating mode, it is assumed that acting flow miAnd heat absorption flow mjIt is constant, the optimal main steam pressure under the operating mode can be obtained, when
When exhaust steam pressure is constant, Δ hiConstant, load W is also constant, it is believed that optimal main steam pressure and load and stream under the operating mode
Amount is all one-to-one；But in fact, due to the change of the factors such as ambient temperature, circulating water flow, unit steam discharge
Pressure can vary widely, if exhaust steam pressure changes 10kPa, Δ hi9% will be changed, load W will also change 9%, but steam discharge
The change of pressure does not influence but on the optimal main steam pressure under the operating mode, i.e., optimal main steam pressure and flow under the operating mode
It is to correspond, but is not one-to-one with load.
In summary, as the conventional method of sliding pressure optimization of profile benchmark and it is insufficient to accurately using unit load.To be abundant
Consider influence of the change of unit exhaust steam pressure in actual moving process to unit performance, the embodiment of the present invention proposes one kind with master
Improved fired power generating unit sliding pressure optimization of profile method on the basis of steam flow.
Reference picture 3, the implementation steps of the sliding pressure optimization of profile method of fired power generating unit steam turbine provided in an embodiment of the present invention
For：1st, different main steam pressures is selected to carry out economy Comparability test under a certain main steam flow, according to test data point
The unit heat consumption under identical main steam flow difference main steam pressure is not calculated.2nd, select heat consumption under the main steam flow minimum
When corresponding main steam pressure, the optimal main steam pressure being considered as under the main steam flow.3rd, change main steam flow, repeat
1st, 2 step, the optimal main steam pressure under different main steam flows is obtained.4th, by obtained main steam flow and optimal main steam
Pressure dependence is nested into the control system of fired power generating unit so that after unit stable conditions, its main steam pressure is always the master
Optimal value corresponding to steam flow.
Simultaneously as in fired power generating unit, the main steam flow of fired power generating unit can not be generally directly obtained, by not staying lid
Your formula understands that main steam flow has direct relation with first stage pressure, governing stage temperature and exhaust steam pressure, and the present invention is implemented
Example also proposes that the main steam flow in step 1 leads to by the sliding pressure optimization of profile method for not staying gale formula principle application enhancements
Cross and not stay gale formula to be calculated；Obtained main steam flow and optimal main steam pressure relation are nested into fire in step 4
In the control system of group of motors so that after unit stable conditions, its main steam pressure is always by not staying gale formula to calculate
Obtain the optimal value corresponding to main steam flow.
Gale formula is not stayed to be divided into three kinds, formula (3) is using first stage pressure, governing stage temperature and exhaust steam pressure to main steaming
Steam flow amount is calculated, and is considered more comprehensive but is calculated relative complex；Because exhaust steam pressure with first stage pressure compares very little, neglect
The influence of slightly exhaust steam pressure is feasible, sees formula (4)；Because main steam temperature is definite value, the change of governing stage temperature is also very
It is small, therefore the change of governing stage temperature can be further have ignored, see formula five.These three not stay gale formula to can be applied to this
In optimization method described in inventive embodiments.
In formula：m、Pm、Pz, T represent flow, main steam pressure, exhaust steam pressure and temperature respectively；
Subscript 0 and 1 represents design conditions and any operating mode respectively (parameter is known under design conditions).
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in computer read/write memory medium, and the program exists
During execution, execution the step of including above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or CD
Etc. it is various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (4)
1. a kind of sliding pressure optimization of profile method of fired power generating unit steam turbine, it is characterised in that methods described includes：
Step 1, main steam flow is determined, keeps the main steam flow constant, then changes main steam pressure, obtain described
Unit heat consumption corresponding to multiple different main steam pressures difference under main steam flow；
Step 2, the minimum unit heat consumption under the main steam flow, main steam pressure corresponding to the minimum unit heat consumption are selected
For the optimal main steam pressure under the main steam flow；
Step 3, change the main steam flow, be repeated in performing step 1 and step 2, obtain different main steam flow difference
Corresponding optimal main steam pressure；
Step 4, the optimal main steam pressure according to corresponding to different main steam flows difference, obtains main steam flow and optimal main steaming
The curve of steam pressure, the sliding pressure curve as fired power generating unit steam turbine.
2. the sliding pressure optimization of profile method of steam turbine in a kind of fired power generating unit according to claim 1, it is characterised in that step
Main steam flow is determined in rapid 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0, main steam pressure Pm0, exhaust steam pressure Pz0And temperature T0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode, Pz1Represent the exhaust steam pressure under any operating mode, T1Table
Show the temperature under any operating mode.
3. the sliding pressure optimization of profile method of steam turbine in a kind of fired power generating unit according to claim 1, it is characterised in that step
Main steam flow is determined in rapid 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0, main steam pressure Pm0And temperature T0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode, T1Represent the temperature under any operating mode.
4. the sliding pressure optimization of profile method of steam turbine in a kind of fired power generating unit according to claim 1, it is characterised in that step
Main steam flow is determined in rapid 1, wherein, the main steam flow m1Calculating process be：
Main steam flow m under known nominal operating mode0With main steam pressure Pm0；
So as to the main steam flow m under any operating mode1Meet：
Wherein, Pm1Represent the main steam pressure under any operating mode.
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Cited By (6)
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| CN108930565A (en) * | 2018-07-30 | 2018-12-04 | 深圳众诚联合能源科技有限公司 | A kind of Steam Turbine peak regulation optimization method and system |
| CN109033724A (en) * | 2018-09-14 | 2018-12-18 | 神华准格尔能源有限责任公司 | Stream temperature degree applied to steam turbine sliding pressure operation consumes poor fair curve optimization method |
| CN109372594A (en) * | 2018-12-29 | 2019-02-22 | 国电南京电力试验研究有限公司 | A kind of Double reheat steam turbine sliding pressure operation optimization method |
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN111652418A (en) * | 2020-05-25 | 2020-09-11 | 西安西热节能技术有限公司 | Method for generating sliding pressure curve of dynamic refined composite parameter of thermal power generating unit |
| CN113359890A (en) * | 2021-06-24 | 2021-09-07 | 华润电力技术研究院有限公司 | Coal-fired unit main steam pressure setting optimization method and related components |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108930565A (en) * | 2018-07-30 | 2018-12-04 | 深圳众诚联合能源科技有限公司 | A kind of Steam Turbine peak regulation optimization method and system |
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| CN109372594A (en) * | 2018-12-29 | 2019-02-22 | 国电南京电力试验研究有限公司 | A kind of Double reheat steam turbine sliding pressure operation optimization method |
| CN109372594B (en) * | 2018-12-29 | 2021-02-19 | 国电南京电力试验研究有限公司 | Method for optimizing sliding pressure operation of double reheating steam turbine |
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN111652418A (en) * | 2020-05-25 | 2020-09-11 | 西安西热节能技术有限公司 | Method for generating sliding pressure curve of dynamic refined composite parameter of thermal power generating unit |
| CN111652418B (en) * | 2020-05-25 | 2022-04-12 | 西安西热节能技术有限公司 | Method for generating sliding pressure curve of dynamic refined composite parameter of thermal power generating unit |
| CN113359890A (en) * | 2021-06-24 | 2021-09-07 | 华润电力技术研究院有限公司 | Coal-fired unit main steam pressure setting optimization method and related components |
| CN113359890B (en) * | 2021-06-24 | 2024-06-07 | 深圳市出新知识产权管理有限公司 | Main steam pressure setting optimization method of coal-fired unit and related components |
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