CN105225008A - A kind of method predicting thermodynamic system of steam tur internal operation parameter - Google Patents
A kind of method predicting thermodynamic system of steam tur internal operation parameter Download PDFInfo
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- CN105225008A CN105225008A CN201510644890.4A CN201510644890A CN105225008A CN 105225008 A CN105225008 A CN 105225008A CN 201510644890 A CN201510644890 A CN 201510644890A CN 105225008 A CN105225008 A CN 105225008A
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Abstract
The invention discloses a kind of method predicting thermodynamic system of steam tur internal operation parameter, adopt the device performance data storehouse that the last comprehensive steam turbine test obtains, through considering actual motion external condition, the internal operation parameter of the interval thermodynamic system of steam tur of measurable wide load operation; Again by daily monitoring operational factor being compared with the predicted value that the present invention obtains, the change of operating states of the units can be judged more exactly, improving the security of equipment use.And the predicted value that the present invention obtains can be used as the reference value of steam turbine performance monitoring and fault diagnosis, the index change of diagnosis steam turbine performance and equipment failure can be widely used in.
Description
Technical field
The invention belongs to power field, particularly relate to a kind of method predicting thermodynamic system of steam tur internal operation parameter.
Background technology
Steam Turbine in Fire Power Plant performance monitoring and fault diagnosis are more and more subject to the attention of power plant, and any internal operation parameter of thermodynamic system of steam tur and predicted value relatively large deviation all represent: 1) possible equipment performance changes or fault; 2) possible measuring instrument measuring error or fault.Therefore the change how by analyzing actual set operational process thermodynamic system of steam tur internal operation parameter is analyzed real-time and is judged steam turbine operation state, has very important significance.
In actual set operational process, power plant operations staff is the direct operation conditions being assessed thermodynamic system of steam tur by monitoring thermodynamic system of steam tur internal operation Parameters variation mainly, but, the change of thermodynamic system of steam tur operational factor, except outside the Pass having with thermodynamic system of steam tur internal unit Performance Characteristics, also changes relevant with external environment condition.Therefore, the current this direct method adopting monitoring operational factor to assess the operation conditions of thermodynamic system of steam tur, accurately can not judge steam turbine performance change and equipment fault diagnosis.When assessing the operation conditions of thermodynamic system of steam tur, after external environment condition change should being got rid of operational factor influence factor, steam turbine performance change and equipment fault diagnosis more accurately could be judged.In addition, unit load frequent variations, directly adopts operational factor change can not assess the operation conditions of thermodynamic system of steam tur very well.
Summary of the invention
In order to solve the technical matters existed in background technology, the present invention proposes a kind of method predicting thermodynamic system of steam tur internal operation parameter, adopt the device performance data storehouse that the last comprehensive steam turbine test obtains, through considering actual motion external condition, the internal operation parameter of the interval thermodynamic system of steam tur of measurable wide load operation.
The invention provides a kind of method predicting thermodynamic system of steam tur internal operation parameter, be applied to condensing steam turbine generator, comprise the steps:
S1, by the comprehensive Turbine Performance Test under one group of different load, obtain each equipment performance characteristics parameter in thermodynamic system of steam tur;
S2, according to each equipment performance characteristics parameter obtained under above-mentioned load, the respectively relation curve of each equipment performance characteristics parameter of matching and feedwater flow, the performance database of formation thermodynamic system of steam tur;
S3, measure input value according to the external environment condition parameter of thermodynamic system of steam tur and feedwater flow, calculated by prediction and calculation subsystem and performance database, draw the internal operation parameter of the thermodynamic system of steam tur of prediction.
Further, step S1 must at least test under high, medium and low three different load operating modes.
Further, above-mentioned load range is 40%THA ~ 100%THA.
Further, each equipment performance characteristics parameter of step S1 comprises: poor, each extraction line crushing of high pressure cylinder efficiency, IP efficiency, low pressure (LP) cylinder efficiency, well heater upper and lower side, each extraction stage equivalent flow area, steam feed pump enthalpy rise and reheater crushing.
Further, input value in step S3 is external environment condition parameter and the feedwater flow measured value of thermodynamic system of steam tur, comprises reheat heat vapor (steam) temperature Th, condenser pressure Pk and feedwater flow m before temperature Tm before pressure P m before steam turbine main steam valve, main steam valve, middle pressure pitch.
Preferably, described feedwater flow needs to calculate with the main condensate flow measurement required according to testing standard the feedwater flow obtained when comprehensive Turbine Performance Test and checks, or described feedwater flow needs to adopt the low β value throat pressure feedwater flow gaging nozzle through verification according to the processing and manufacturing of ASME standard.
Disclosing based on technique scheme, the method of described prediction thermodynamic system of steam tur internal operation parameter provided by the invention, adopt the device performance data storehouse that the last comprehensive steam turbine test obtains, through considering actual motion external condition, the internal operation parameter of the interval thermodynamic system of steam tur of measurable wide load operation; Again by daily monitoring operational factor being compared with the predicted value that the present invention obtains, the change of operating states of the units can be judged more exactly, improving the security of equipment use.And the predicted value that the present invention obtains can be used as the reference value of steam turbine performance monitoring and fault diagnosis, the index change of diagnosis steam turbine performance and equipment failure can be widely used in.
Accompanying drawing explanation
Fig. 1 is holistic approach process flow diagram of the present invention;
Fig. 2 is the prediction process flow diagram of step S3 of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
Refer to Fig. 1, the present embodiment provides a kind of method predicting thermodynamic system of steam tur internal operation parameter, is applied to condensing steam turbine generator, comprises the steps:
S1, at least under high, medium and low three different load operating modes (load range: 40%THA ~ 100%THA), carry out comprehensive Turbine Performance Test, obtain each equipment performance characteristics parameter in thermodynamic system of steam tur;
S2, according to each equipment performance characteristics parameter obtained under above-mentioned load, the respectively relation curve of each equipment performance characteristics parameter of matching and feedwater flow (or other boundary parameters), the performance database of formation thermodynamic system of steam tur;
S3, measure input value according to the external environment condition parameter of thermodynamic system of steam tur and feedwater flow, calculated by prediction and calculation subsystem and performance database, draw the internal operation parameter of the thermodynamic system of steam tur of prediction.
Each equipment performance characteristics parameter of step S1 comprises: poor, each extraction line crushing of high pressure cylinder efficiency, IP efficiency, low pressure (LP) cylinder efficiency, well heater upper and lower side, each extraction stage equivalent flow area, steam feed pump enthalpy rise and reheater crushing.
Refer to Fig. 2, input value in step S3 is external environment condition parameter and the feedwater flow measured value of thermodynamic system of steam tur, comprises reheat heat vapor (steam) temperature Th, condenser pressure Pk and feedwater flow m before temperature Tm before pressure P m before steam turbine main steam valve, main steam valve, middle pressure pitch.And described feedwater flow needs when comprehensive Turbine Performance Test and calculates according to the main condensate flow measurement that testing standard requires the feedwater flow obtained to check.
The performance database of step S2 includes but not limited to:
1) relation of IP efficiency and feedwater flow;
2) relation of low pressure (LP) cylinder efficiency (UEEP) and low pressure (LP) cylinder steam discharge volume flow;
3) steam turbine each extraction stage equivalent flow area;
4) relation of well heater upper end difference and feedwater flow;
5) relation of well heater lower end difference and feedwater flow;
6) relation of each extraction line crushing and feedwater flow;
7) relation of feed pump top hole pressure and feedwater flow;
8) relation of boiler reheater crushing and feedwater flow;
9) steam feed pump enthalpy rises the relation with feed pump top hole pressure;
10) relation of steam feed pump admission flow and feedwater flow;
11) relation of turbine shaft seal leakage rate and feedwater flow.
The method of this prediction thermodynamic system of steam tur internal operation parameter is applicable to the thermodynamic system of steam tur of two kinds of different distribution way of steam, i.e. the thermodynamic system of steam tur of nozzle governing mode and the thermodynamic system of steam tur of throttling distribution way of steam.The steam turbine height cylinder efficiency of two kinds of different distribution way of steam is all subject to the impact of the restriction loss of main steam valve and adjustment doors, in order to predict that one takes out parameter better, therefore define two cylinder efficiency indexs, one is high pressure cylinder efficiency before a section of being calculated by steam parameter before steam turbine main steam valve to high pressure cylinder one section of parameter of drawing gas draws gas; Two is the high pressure cylinder efficiency calculated to high pressure cylinder steam discharge parameter by steam parameter before steam turbine main steam valve; Therefore the performance database of step S2 also comprises:
12) one section draw gas before the relation of high pressure cylinder efficiency and high pressure cylinder admission volume flow;
13) relation of high pressure cylinder efficiency and high pressure cylinder admission volume flow.
Described one section draw gas before the computing formula of high pressure cylinder efficiency be:
Wherein: η
hP1---one section draw gas before high pressure cylinder efficiency, %; h
mS---main steam enthalpy, kJ/kg; h
1---one section of enthalpy that draws gas, kJ/kg; h
1S---one section of constant entropy enthalpy that draws gas, kJ/kg.
The computing formula of described high pressure cylinder efficiency is:
Wherein: η
hP---high pressure cylinder efficiency, %; h
2---high pressure cylinder steam discharge enthalpy, kJ/kg; h
2S---high pressure cylinder steam discharge constant entropy enthalpy, kJ/kg.
The computing formula of described IP efficiency is:
Wherein: η
iP---IP efficiency, %; h
iPin---intermediate pressure cylinder inlet steam enthalpy, kJ/kg; h
iPexh---intermediate pressure cylinder steam discharge enthalpy, kJ/kg; h
iPexhs---intermediate pressure cylinder steam discharge constant entropy enthalpy, kJ/kg.
The computing formula of the efficiency of described low pressure (LP) cylinder steam discharge available energy terminal is:
Wherein: η
lP---the efficiency of low pressure (LP) cylinder steam discharge available energy terminal, %; h
lPin---low pressure (LP) cylinder admission enthalpy, kJ/kg; h
uEEP---low pressure (LP) cylinder steam discharge available energy terminal enthalpy, kJ/kg; h
uEEPS---low pressure (LP) cylinder steam discharge available energy terminal constant entropy enthalpy, kJ/kg.
The computing formula of described high pressure cylinder admission volume flow is:
V
MS＝m
MS×v
MS
Wherein: V
mS---high pressure cylinder admission volume flow, m
3/ s; m
mS---main steam flow, kg/s, supposes to equal feedwater flow; v
mS---main steam specific volume, m
3/ kg.
The computing formula of described low pressure (LP) cylinder steam discharge volume flow is:
V
LPEXH＝m
LPEXH×v
LPEXH
Wherein: V
lPEXH---low pressure (LP) cylinder steam discharge volume flow, m
3/ s; m
lPEXH---low pressure (LP) cylinder exhaust steam flow, kg/s; v
lPEXH---low pressure (LP) cylinder steam discharge specific volume, m
3/ kg.
The computing formula of described well heater upper and lower end difference is respectively:
Well heater upper end is poor:
TTD＝T
SAT-T
OUT
Well heater lower end is poor:
DCA＝T
D-T
IN
Wherein: T
sAT---saturation temperature under calorifier inlets vapor pressure, DEG C; T
oUT---well heater water side outlet temperature, DEG C; T
d---heater condensate temperature, DEG C; T
iN---well heater water side-entrance temperature, DEG C.
The computing formula of described each extraction line crushing (unit, %) is:
Wherein: P
eXT---bleeder steam mouth vapor pressure, MPa; P
hTR---calorifier inlets vapor pressure, MPa.
The computing formula of each extraction stage equivalent flow area described is:
Wherein: m
eXTH---steam flow after bleeder steam mouth, kg/s; P
eXT---bleeder steam mouth vapor pressure, MPa; v
eXT---bleeder steam mouth steam specific volume, m
3/ kg.
The computing formula that described feed pump enthalpy rises is:
Δh
FFW＝h
POUT-h
PIN
Wherein: h
pOUT---feed pump goes out the enthalpy of saliva, kJ/kg; h
pIN---the enthalpy of feed pump import water, kJ/kg.
The computing formula of described reheater crushing (unit, %) is:
Wherein: P
cRH---cold reheated steam pressure, MPa; P
hRH---reheat heat vapor pressure, MPa.
In above-mentioned each computing formula, each extraction opening pressure is determined by steam flow after each extraction stage equivalent of steam turbine in performance database flow area and inflow extraction opening, and other parameters are determined by corresponding each cylinder efficiency and each extraction opening pressure; Each calorifier inlets vapor pressure is determined by extraction line crushing each in corresponding extraction opening pressure and database; Each calorifier inlets vapor (steam) temperature is determined by inlet steam pressure and the enthalpy that draws gas; Well heater turnover saliva side temperature and drain temperature are determined by well heater upper and lower end difference in calorifier inlets vapor pressure and database; Each well heater admission flow is determined by well heater heat Balance Calculation; Other inner stream flows are determined by mass balance calculation$; Feed pump top hole pressure is determined by feedwater flow in database; Steam feed pump enthalpy rises to be determined by feed pump top hole pressure in database; Steam feed pump admission flow is determined by feedwater flow in database; Reheated steam pressure is determined by intermediate pressure cylinder entrance equivalent flow area in reheated steam flow and database; High row pressure power is by boiler reheater crushing in database and feedwater flow relation, and reheated steam pressure is determined; Oxygen-eliminating device leaving water temperature is determined by oxygen-eliminating device inlet steam pressure; Hot well temperature is determined by condenser discharge pressure and condenser supercooling degree; The performance parameters such as each cylinder shaft power, turbodynamo gross engine output, hair heat consumption rate, by known input measurement parameter and above-mentioned Prediction Parameters, calculate according to ASMEPTC6-2004 or GB/T8117.1-2008 standard method and obtain.
To sum up, the method of described prediction thermodynamic system of steam tur internal operation parameter provided by the invention, adopt the device performance data storehouse that the last comprehensive steam turbine test obtains, through considering actual motion external condition, the internal operation parameter of the interval thermodynamic system of steam tur of measurable wide load operation; Again by daily monitoring operational factor being compared with the predicted value that the present invention obtains, the change of operating states of the units can be judged more exactly, improving the security of equipment use.And the predicted value that the present invention obtains can be used as the reference value of steam turbine performance monitoring and fault diagnosis, the index change of diagnosis steam turbine performance and equipment failure can be widely used in.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (7)
1. predict a method for thermodynamic system of steam tur internal operation parameter, be applied to condensing steam turbine generator, it is characterized in that, comprise the steps:
S1, by the comprehensive Turbine Performance Test under one group of different load, obtain each equipment performance characteristics parameter in thermodynamic system of steam tur;
S2, according to each equipment performance characteristics parameter obtained under above-mentioned load, the respectively relation curve of each equipment performance characteristics parameter of matching and feedwater flow, the performance database of formation thermodynamic system of steam tur;
S3, measure input value according to the external environment condition parameter of thermodynamic system of steam tur and feedwater flow, calculated by prediction and calculation subsystem and performance database, draw the internal operation parameter of the thermodynamic system of steam tur of prediction.
2. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 1, is characterized in that, step S1 must at least test under high, medium and low three different load operating modes.
3. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 2, is characterized in that, load range is 40%THA ~ 100%THA.
4. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 1, it is characterized in that, each equipment performance characteristics parameter of step S1 comprises: poor, each extraction line crushing of high pressure cylinder efficiency, IP efficiency, low pressure (LP) cylinder efficiency, well heater upper and lower side, each extraction stage equivalent flow area, steam feed pump enthalpy rise and reheater crushing.
5. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 1, it is characterized in that, input value in step S3 is external environment condition parameter and the feedwater flow measured value of thermodynamic system of steam tur, comprises reheat heat vapor (steam) temperature Th, condenser pressure Pk and feedwater flow m before temperature Tm before pressure P m before steam turbine main steam valve, main steam valve, middle pressure pitch.
6. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 1, it is characterized in that, described feedwater flow needs to calculate with the main condensate flow measurement required according to testing standard the feedwater flow obtained when comprehensive Turbine Performance Test and checks.
7. a kind of method predicting thermodynamic system of steam tur internal operation parameter according to claim 1, is characterized in that, described feedwater flow adopts the low β value throat pressure feedwater flow gaging nozzle through verification according to the processing and manufacturing of ASME standard.
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| CN108319131A (en) * | 2017-12-27 | 2018-07-24 | 国网山东省电力公司电力科学研究院 | Peak load regulation capability assessment method based on data mining |
| CN108691585A (en) * | 2018-05-09 | 2018-10-23 | 国网山东省电力公司电力科学研究院 | A kind of computational methods of condensing turbine low pressure (LP) cylinder efficiency |
| CN109543903A (en) * | 2018-11-21 | 2019-03-29 | 珠海格力电器股份有限公司 | A kind of air source heat pump energy consumption prediction technique and system |
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| CN110925031A (en) * | 2019-11-29 | 2020-03-27 | 哈尔滨汽轮机厂有限责任公司 | High-power indirect air cooling steam turbine management and control system |
| CN111365083A (en) * | 2020-04-10 | 2020-07-03 | 西安热工研究院有限公司 | Thermal parameter-based turbine through-flow part fault diagnosis method |
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| CN108319131A (en) * | 2017-12-27 | 2018-07-24 | 国网山东省电力公司电力科学研究院 | Peak load regulation capability assessment method based on data mining |
| CN108691585A (en) * | 2018-05-09 | 2018-10-23 | 国网山东省电力公司电力科学研究院 | A kind of computational methods of condensing turbine low pressure (LP) cylinder efficiency |
| CN109543903A (en) * | 2018-11-21 | 2019-03-29 | 珠海格力电器股份有限公司 | A kind of air source heat pump energy consumption prediction technique and system |
| CN109543903B (en) * | 2018-11-21 | 2021-04-27 | 珠海格力电器股份有限公司 | Method and system for predicting energy consumption of air source heat pump |
| CN109858810A (en) * | 2019-01-31 | 2019-06-07 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | The calculation method of Steam Turbine pure condensate power generation heat consumption rate when supplying thermal condition |
| CN109858810B (en) * | 2019-01-31 | 2022-04-26 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Method for calculating pure condensation power generation heat consumption rate of steam turbine set under heat supply working condition |
| CN110925031A (en) * | 2019-11-29 | 2020-03-27 | 哈尔滨汽轮机厂有限责任公司 | High-power indirect air cooling steam turbine management and control system |
| CN111365083A (en) * | 2020-04-10 | 2020-07-03 | 西安热工研究院有限公司 | Thermal parameter-based turbine through-flow part fault diagnosis method |
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