CN107503805A - F levels single shaft gas Steam Combined Cycle hot systems and generating set economic target system - Google Patents
F levels single shaft gas Steam Combined Cycle hot systems and generating set economic target system Download PDFInfo
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
- F01K23/106—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle with water evaporated or preheated at different pressures in exhaust boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The present invention relates to a kind of F levels single shaft gas Steam Combined Cycle hot systems and generating set economic target system, it belongs to gas combustion-gas vapor combined cycle technical field.Combined cycle hot systems of the present invention include generator, gas turbine group and vapor wheel unit, gas turbine group and vapor wheel unit are connected with generator, gas turbine group includes compressor, combustion chamber and the combustion gas turbine being sequentially communicated, vapor wheel unit includes waste heat boiler, high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, and the high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder are connected with waste heat boiler respectively.The present invention also provides a kind of combined cycle generating unit economic target system.The present invention is rational in infrastructure, securely and reliably, to realize the management of machine set technology economic indicator and analysis, while is laid the foundation for the Energy Conservation Supervision work of gas combustion-gas vapor combined cycle unit.
Description
Technical field
The present invention relates to a kind of system and economic target system, is followed more particularly, to a kind of F levels single shaft gas Steam Combined
Ring hot systems and generating set economic target system, it belongs to gas combustion-gas vapor combined cycle technical field.
Background technology
By the accumulation of operating experience for many years, in terms of unit safety, stable operation is ensured, each fuel gas generation enterprise is
The management system of relative maturity is formed, but in technical-economic index management aspect, does not form a set of perfect management body also
System, operation and administrative staff can not be instructed to carry out the management work of technical-economic index.
Producing such case main cause includes：(1) starting of China's fuel engine power generation technology is more late, and fuel engine power generation unit exists
Accounting in generating set is smaller, and the country less payes attention to the research of the technical-economic index system for fuel engine power generation unit；(2)
For China's Gas Turbine Generating Units substantially from external import, the technical data grasped is less relative to coal unit, lacks
Fully optimized and research to therrmodynamic system, especially the Economy Quantitative Analysis of therrmodynamic system localized variation is studied, so
Up to the present, there is presently no the management system for forming complete set in terms of unit economy for jet dynamic control.
At present, fuel engine power generation factory is when the economy to unit is evaluated, typically to some main comprehensive factories
Level index carries out statistical analysis, such as power supply gas consumption, delivery, generating gas consumption, station service power consumption rate, rate of load condensate and Unit Commitment number
Deng, and be basically carried out some on year-on-year basis or rings than statistical analysis.This assay method can only be to a certain extent
The overall operation economic level of unit is grasped, the factor and influence degree for influenceing unit economy can not be followed the trail of, it is difficult to instruct
Operations staff optimizes and revises the operation of unit.
It is mutual between three big capital equipment of Combined cycle gas-steam turbine unit (gas turbine, waste heat boiler, steam turbine)
Influence relation is complicated, and the coupling between index is better than traditional Thermal generation unit, adds each equipment of Combined Cycle Unit and refers to
Mark management and the difficulty of analysis.So far, the research on Combined Cycle Unit technical-economic index carried out is main
The statistical analysis and the performance of contrast and capital equipment for realizing unit overall target calculate, but between being related to index mutually
Influence relation, index analysis, metrics evaluation are also fewer.
Therefore it provides a kind of method being combined using theory analysis and simulation calculation, establish it is a set of it is perfect, meet connection
The technical-economic index system of Cycle Unit operation characteristic is closed, realizes Combined Cycle Unit index, analysis and evaluation, it appears particularly
It is necessary.
Publication date is on 07 04th, 2017, in Publication No. 106920179A Chinese patent, discloses a kind of title
For the patent of invention of " method for building up of intelligent grid project of transmitting and converting electricity assessment indicator system ".The patent includes obtaining index item
Mesh；Establish preliminary assessment index system and correct；The degree of association and sequence between analysis indexes；Index is adjusted；Again
Correlation analysis is carried out, so as to obtain final appraisement system.Although the patent passes through the evaluation of selection candidate as much as possible
Index, and the correlation degree between each evaluation index is calculated, and evaluation index is screened and arranged according to correlation degree,
So as to obtain optimal assessment indicator system；Can science, reliable, the complete evaluation for obtaining intelligent grid project of transmitting and converting electricity refer to
Mark system, but the index system is not suitable for Combined cycle gas-steam turbine hot systems and generating set economic target system, therefore
It may not apply to the system.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and offer is a kind of reasonable in design,
Securely and reliably, the gas combustion-gas vapor combined cycle machine set technology economic target system of complete set is established, to realize unit skill
The management and analysis of art economic indicator, while work what is laid the foundation for the Energy Conservation Supervision of gas combustion-gas vapor combined cycle unit
F levels single shaft gas Steam Combined Cycle hot systems and generating set economic target system.
Technical scheme is used by the present invention solves the above problems：Should
The present invention compared with prior art, has advantages below and effect：1st, F levels single shaft gas Steam Combined Cycle heat system
System, it is reasonable in design, securely and reliably；2nd, the F level single shaft gas steam combined cycle power generating unit index system frames established
Frame, it is easy to carry out the detection and analysis of economic index；3rd, the mechanism model corrected by Thermoflex, utilizes method of small deviations
And equivalent enthalpy drop method is to the influence relation between F level single shaft gas steam combined cycle power generating unit index systems the superior and the subordinate index
Comprehensive analysis and research have been carried out with the consumption difference of Small Indicators；4th, F levels single shaft gas-steam joint is built using Thermoflow
Circulating generation unit simulation model, and to F level single shaft gas steam combined cycle power generating unit index systems the superior and the subordinate index it
Between influence relation and the consumption differences of Small Indicators carried out comprehensive analysis；5th, by the Analysis on Mechanism such as little deviation and equivalent enthalpy drop with
Thermoflow simulation models are contrasted, and ensure the degree of accuracy of analysis result.
Brief description of the drawings
Fig. 1 is the structural representation of F level single shaft gas-steam combined cycle hot systems of the embodiment of the present invention.
Fig. 2 is the knot of F level single shaft gas-steam combined cycle generating unit technical-economic index systems of the embodiment of the present invention
Structure schematic diagram.
Fig. 3 is influence schematic diagram of waste heat boiler of the embodiment of the present invention input gas temperature change to efficiency.
Fig. 4 is influence schematic diagram of exhaust-heat boiler flue gas of the embodiment of the present invention side pressure damage change to efficiency.
In figure：Generator 1, gas turbine group 2, vapor wheel unit 3, compressor 21, combustion chamber 22, combustion gas turbine 23 are remaining
Heat boiler 31, high pressure cylinder 32, intermediate pressure cylinder 33, low pressure (LP) cylinder 34, condenser 35, condensate pump 36, natural gas A, air B, flue gas C,
Discharge fume D, condensate E, and high pressure cylinder enters vapour F, intermediate pressure cylinder steam discharge G, low pressure (LP) cylinder steam discharge H, low-pressure steam I.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1 to Fig. 4, the present embodiment F level single shaft gas Steam Combined Cycles hot systems mainly include generator 1, combustion
Turbine unit 2 and vapor wheel unit 3, gas turbine group 2 and vapor wheel unit 3 are connected with generator 1, and gas turbine group 2 is wrapped
Include the compressor 21 being sequentially communicated, combustion chamber 22 and combustion gas turbine 23, vapor wheel unit 3 include waste heat boiler 31, high pressure cylinder 32,
Intermediate pressure cylinder 33 and low pressure (LP) cylinder 34, the high pressure cylinder 32, intermediate pressure cylinder 33 and low pressure (LP) cylinder 34 are connected with waste heat boiler 31 respectively.
The external air B of air input of the air cylinder of the present embodiment, the delivery outlet connection combustion chamber 22 of the compressor 21,
The external natural gas A of natural gas input of combustion chamber 22, the input of the output end connection combustion gas turbine 23 of combustion chamber 22, combustion gas
The flue gas C of turbine 23 is connected by the output end with waste heat boiler 31, passes through the smoke evacuation of waste heat boiler 31 D.
The vapor wheel unit 3 of the present embodiment also includes condenser 35 and condensate pump 36, the condenser 35 and low pressure (LP) cylinder 34
Output end be connected, the output end of condenser 35 is connected by the condensate E of condensate pump 36 with the input of waste heat boiler 31.
The high pressure cylinder 32, intermediate pressure cylinder 33 and low pressure (LP) cylinder 34 of the present embodiment are sequentially connected.
High pressure cylinder in the present embodiment waste heat boiler 31 enters vapour F and enters high pressure cylinder 32, the intermediate pressure cylinder steam discharge in intermediate pressure cylinder 33
Into low pressure (LP) cylinder 34, the low pressure (LP) cylinder steam discharge H in low pressure (LP) cylinder 34 enters condenser 35, and the low-pressure steam I in waste heat boiler 31 is discharged into
Low pressure (LP) cylinder 34.
The present embodiment F level single shaft gas steam combined cycle power generating Unit Economic index systems, step are as follows：
(1) combined cycle generating unit economic target system framework is built
Combined cycle generating unit is due to system arrangement, the difference of structure, and index quantity may be not quite similar, but technology
The basic structure of economic target system is roughly the same, and index is classified according to the attribute of equipment and system first, then with
Level of factory overall target is top layer index, is successively decomposed according to mechanism relation between index, until the operation little finger of toe of adjustment can be monitored
Mark, such as accompanying drawing 2.Generally, combined cycle generating unit economic target system can substantially be divided into five indexs：
First class index：Power supply gas consumption (power supplying efficiency, power supply heat consumption).
Two-level index：First class index is directly affected, such as delivery, generating gas consumption (generating efficiency, generating heat consumption).
Three-level index：Two-level index is directly affected, such as generated energy, station-service electricity/rate, gas turbine proficiency, waste heat boiler
Efficiency, turbine efficiency, pipeline efficiency, fuel index.
Level Four index：Three-level index is directly affected, it is main to include influenceing the index of correlation (such as power) of generated energy, influence factory
Index of correlation (such as feed pump station-service electricity, condensate pump station-service electricity, combustion engine (steam turbine) accessory system station service of power consumption
Amount, nonproductive station-service electricity etc.), influence gas turbine proficiency index (such as compressor efficiency, combustion gas turbine efficiency), influence
The index (high, medium and low cylinder pressure efficiency etc.) of turbine efficiency, index (such as waste heat boiler import cigarette for influenceing waste heat boiler efficiency
Temperature, delivery temperature spray water flux etc.), influence pipeline efficiency index (make-up water percentage, working medium temperature drop and pressure drop etc.), influence fuel matter
The index (such as gas component, heating value of natural gas) of amount, the index (natural gas processor loss etc.) for influenceing quantity of fuel.
Pyatyi index：The index that substantially can be directly monitored during production run, as ambient parameter, compressor enter
Mouth pressure drop, compressor delivery temperature and pressure, combustion gas turbine delivery temperature, pressure and flow, high pressure main steam condition, reheating are steamed
Vapour parameter, turbine discharge parameter etc..
(2) analysis of combined cycle generating unit technical-economic index
Research work based on step (1), the calculating and monitoring of Unit Economic index can be achieved, to clear between index
The relation that influences each other and index of correlation change carry out further index analysis work, mainly to unit economy influence degree
Including：
(A) analysis of relation is influenceed between levels index：By quantitative analysis, index of correlation is obtained to upper level
The influence coefficient of index；
(B) index power consumption analysis：Differential analysis calculating is consumed by running Small Indicators to Combined Cycle Unit, makes operations staff
Quantitatively grasping operating index influences the degree of unit economy, in order to intuitively, with knowing the secondary from the primary adjust unit operation；
In the step of the present embodiment (two),
(1) theoretical calculation based on thermodynamic principles
The mechanism relation established by thermodynamics method before levels index, and based on this analysis lower floor index change after
To the quantitative effect of upper strata index, being somebody's turn to do the method for the theoretical calculation analysis based on thermodynamic principles includes method of small deviations and equivalent enthalpy
Drop method.
Equivalent enthalpy drop method：It is poor that the consumption of calculating turbine parameters is analyzed using equivalent enthalpy drop method, calculates the equivalent enthalpy drop of steam
Changes delta H and steam turbine cycle caloric receptivity Q changes delta Q, so as to calculate turbine efficiency relative variation,
I.e.：
In formula：ηst--- turbine efficiency, %；
δηst--- turbine efficiency relative variation, %；
H --- steam-turbine equivalent enthalpy drop, kJ/kg；Three-pressure reheat steam turbine includes the total of high, medium and low voltage steam
Equivalent enthalpy drop；
Δ H --- steam turbine acting capacity variation amount, kJ/kg caused by a certain Parameters variation；
Δ Q --- the change of thermal loss of steam turbine amount, kJ caused by a certain Parameters variation；
Establish the consumption differential mode type of each parameter of steam turbine respectively below with equivalent enthalpy drop method：
(1) main steam pressure
△Hhp=△ h0-αzr△h2 (2)
△Qhp=△ h0-αzr△h2 (3)
In formula：△Hhp--- acting capacity variation, kJ/kg caused by main steam pressure change；
△Qhp--- the change of caloric receptivity, kJ caused by main steam pressure change；
△h0--- main steam specific enthalpy variable quantity, kJ/kg；
αzr--- reheated steam share, %；
△h2--- high pressure cylinder specific enthalpy of exhaust steam variable quantity, kJ/kg.
(2) main steam temperature
△Hht=△ h0-αzr△h2 (4)
△Qht=△ h0-αzr△h2 (5)
In formula：△Hht--- acting capacity variation, kJ/kg caused by main steam temperature change；
△Qht--- the change of caloric receptivity, kJ caused by main steam temperature change；
(3) reheated steam crushing
△Hzp=-αzr△h2 (6)
△Qzp=-αzr△h2 (7)
In formula：△Hzp--- acting capacity variation, kJ/kg caused by the change of reheating crushing；
△Qzp--- the change of caloric receptivity, kJ caused by the change of reheating crushing；
(4) reheat steam temperature
△Hzt=αzr△hzr-αc△hc (8)
△Qhp=αzr△hzr (9)
In formula：△Hzt--- acting capacity variation, kJ/kg caused by reheat steam temperature change；
△Qhp--- caloric receptivity change, kJ caused by reheat steam temperature change；
△hzr--- reheated steam is than enthalpy change, kJ/kg；
αc--- condenser steam discharge share, %；
△hc--- turbine discharge specific enthalpy variable quantity, kJ/kg.
(5) low-pressure steam pressure
△Hlp=αl△hl-αc△hc (10)
△Qlp=αl△hl (11)
In formula：△Hlp--- acting capacity variation, kJ/kg caused by low-pressure steam pressure change；
△Qlp--- caloric receptivity change, kJ caused by low-pressure steam pressure change；
αl--- low-pressure steam share, %；
△hl--- low-pressure steam specific enthalpy variable quantity, kJ/kg.
(6) low-pressure steam temperature
△Hlt=αl△hl-αc△hc (12)
△Qlt=αl△hl (13)
In formula：△Hlt--- acting capacity variation, kJ/kg caused by low-pressure steam temperature change；
△Qlt--- caloric receptivity change, kJ caused by low-pressure steam temperature change；
(7) back pressure
△Hpq=-αc△hc (14)
△Qpq=0 (15)
In formula：△Hpq--- acting capacity variation, kJ/kg caused by economy；
△Qpq--- caloric receptivity variable quantity, kJ.
Method of small deviations：For analyzing the high, medium and low cylinder pressure efficiency change of steam turbine to influence caused by unit economy.
Turbine efficiency：
In formula：Hh--- it is steam turbine high-pressure cylinder isentropic enthalpy drop, kJ/kg；
Hi--- Steam Turbine Through IP Admission isentropic enthalpy drop, kJ/kg；
Hl--- turbine low pressure cylinder isentropic enthalpy drop, kJ/kg；
ηh--- steam turbine high-pressure cylinder efficiency, %；
ηi--- Steam Turbine Through IP Admission efficiency, %；
ηl--- turbine low pressure cylinder efficiency, %；
Q --- thermal loss of steam turbine amount, kJ.
Assuming that thermal loss of steam turbine amount Q is constant, then
In formula：Wh、Wi、Wl--- the high, medium and low cylinder pressure output work of steam turbine, kW；
For reheat-type unit, influence of the preceding cylinder of consideration to rear cylinder；Need to be modified above formula：
In formula：Q --- thermal loss of steam turbine rate, kJ/kWh；
β --- IP efficiency changes the modifying factor for causing efficiency change, general β=0.70~0.75.
The power supply gas consumption of the present embodiment：
In formula, vfd--- generating gas consumption rate, Nm3/kWh；
Lcy--- station service power consumption rate, %.
Influence of the generating gas consumption rate to gas consumption of powering calculates：
In formula,--- the change of generating gas consumption rate is to gas consumption rate influence amount of powering, Nm3/kWh；
--- benchmark generating gas consumption rate, Nm3/kWh；
--- the generating gas consumption rate after change, Nm3/kWh；
△vfd--- the variable quantity of power supply gas consumption rate, Nm3/kWh.
Influence of the station service power consumption rate to gas consumption rate of powering calculates：
In formula,--- station service power consumption rate change is to the influence amount for gas consumption rate of powering, Nm3/kWh；
--- benchmark station service power consumption rate, %；
--- the station service power consumption rate after change, %；
△Lcy--- station service power consumption rate variable quantity, %.
The generating thermal efficiency of the present embodiment
Vcc=ηgt+(1-Vgt)ηbVstVgd (22)
In formula, ηcc--- combined cycle generation efficiency, %；
ηgt--- thermal efficiency of gas turbine, %；
ηb--- the waste heat boiler thermal efficiency, %；
ηst--- the steam turbine thermal efficiency, %；
ηgd--- pipeline efficiency, %.
Generating gas consumption rate influences relation with gas turbine, waste heat boiler, turbine thermodynamic efficiency and calculated：
δηcc=A δ ηgt+Bδηst+Cδηh+Dδηgd (23)
In formula：
The thermal efficiency of gas turbine of the present embodiment：According to thermodynamic principles, compressor, combustion chamber, gas turbine machine are established
Manage computation model.
The power output of gas turbine is represented by：
Wgt=(Wt-Wc)ηm (24)
In formula：Wgt--- gas turbine power output, kW；
Wt--- combustion gas turbine power output, kW；
Wc--- power input to compressor rate, kW；
ηm--- mechanical efficiency, %.
Compressor compresses wasted work：
Wc=Gawc (25)
In formula：Ga--- compressor inlet air mass flow, kg/s；
wc--- the ratio work(consumed in compression 1kg air, kW/kg.
Compressor compares work(：
In formula：--- air average specific heat at constant pressure holds, kJ/kgK；Compressor delivery temperature：
Combustion gas turbine power output：
Wt=Ggwt (28)
In formula：Gg--- combustion gas turbine extraction flow, kg/s；
wt--- combustion gas turbine is exported than work(, kW/kg.
Combustion gas turbine compares work(：
In formula：--- flue gas average specific heat at constant pressure holds, kJ/kgK；Turbine exhaust temperature：
Combustion gas turbine Fu Liugeer formula：
Combustion chamber mass flow formula：
Gg=Ga+Gf (32)
Gas turbine proficiency：
Compressor pressure ratio and combustion gas turbine expansion ratio relation：
πt=ξ πc (34)
In formula：ξ --- pressurize coefficient.
In the gas turbine course of work, Partial shrinkage air can be constantly extracted from compressor to cool down combustion gas turbine,
Cooling air delivery constitutes about 12% or so of compressor inlet flow.Cooling air parameter can not be determined, is led to not to cold
But air part carries out detailed mechanism calculating.
The present embodiment corrects gas turbine theoretical calculation model by simulation calculation software Thermoflow, introduces compressor
Wasted work correction factorWith combustion gas turbine output work correction factorTo eliminate shadow of the cooling air to gas turbine computational accuracy
Ring.
Formula 34 is arrived according to formula 24, using method of small deviations, gas turbine operation parameter and gas turbine proficiency can be established
Little deviation equation is as follows：
δηgt=[(k6+1)-k5]δT3+[(k5-1)-k6]δT1+[k1k2(k5-1)+k3(k6-1)-k1k6]δπc
+[k6-k2(k5-1)δηc+(k6+1)δηt+k3(k6+1)δξ+δηr
(35)
In formula,
The turbine thermodynamic efficiency of the present embodiment：The quantitative analysis of steam turbine technology economic indicator, it is exactly analyzing influence steamer
After the index of machine operation characteristic deviates a reference value, the size of steam turbine economy is influenceed, quantitative analysis steam turbine economy refers at present
Calibration method mainly has four kinds：(1) characteristics testing method；(2) characteristic method；(3) equivalent enthalpy drop method；(4) side such as method of small deviations
Method.Wherein characteristics testing method takes time and effort, and it is difficult to ensure that the change of single parameter during experiment；Due to unit for a long time
Operation caused by machine unit characteristic change, characteristic method result of calculation deviation is larger, and mainly equivalent enthalpy drop is used in this report
Method and method of small deviations to influence caused by the change of quantitative analysis steam turbine operation index.
By taking current typical GE companies single shaft F level gas-steam combined cycle sets as an example, this combined cycle generating unit
Capital equipment be GE companies production PG9351FA gas turbines, three pressure without afterburning reheating Natural Circulation HRSG and three pressure again
Hot pure condensate formula steam turbine, heat flow diagrams are as shown in Figure 1.
The present embodiment enters the analysis meter of row index by taking GE companies 9FA single shaft gas steam combined cycle power generating units as an example
Calculate, result of calculation collects such as Tables 1 and 2：
Influence of the gas turbine Small Indicators of table 1 to joint recycling economy index
Influence of the steam turbine Small Indicators of table 2 to joint recycling economy index
(2) simulation calculation based on Thermoflow
Theoretical mould between last point of Combined Cycle Unit established based on thermodynamic principles, each equipment economic index
Type, and quantitative analysis has been carried out to the influence relation between each index, it is the management of combined cycle generating unit economic index
There is provided and instruct.But the problem of following two aspects also be present：(1) relational expression can not include equipment each with combined cycle machine and pass through
The related all indexs of Ji property；(2) various coupled relations between economic index, by technical data is limited, this coupling is closed
System is difficult to be expressed with accurate display relational expression.So the result of thermodynamic argument analysis lacks necessarily comprehensive.
Based on Thermoflow simulation calculation softwares, the thermodynamics simulation model of Combined Cycle Unit and each equipment is established,
And variable condition calculation is carried out, analyze the quantitative effect relation between each index.
Calculated examples：By taking GE companies 9FA single shaft gas steam combined cycle power generating units as an example, enter the analysis meter of row index
Calculate, under result of calculation collects：
Gas turbine economic index：
| Parameter | Unit | x3 | x2 | x | x0 |
| Environment temperature | ℃ | -2.81E-07 | -1.72E-05 | -2.98E-04 | 1.0118 |
| Atmospheric pressure | bar | 0 | -0.0052 | -0.0238 | 1.0294 |
| Relative humidity | % | 0 | 1.88E-08 | -3.35E-05 | 1.0025 |
| Compressor air inlet machine crushing | mbar | 0 | -6.81E-07 | -3.48E-04 | 1.0021 |
| Compressor efficiency reduces | % | 0 | -2.49E-04 | -9.38E-03 | 1 |
| Turbine-inlet temperature raises | ℃ | 0 | 4.88E-06 | 1.48E-04 | 0.99995 |
| Efficiency of turbine reduces | % | 0 | 0.00E+00 | -1.87E-02 | 1.0004 |
| Turbine exhaust crushing | mbar | 4.56E-07 | -4.27E-04 | 1.0137 | |
| Rate of load condensate | % | 0 | -2.59E-05 | 8.06E-03 | 0.45153 |
The gas turbine economic index of table 3 influences relation fitting formula coefficient to gas turbine proficiency and collected
Waste heat boiler economic index：
Waste heat boiler mainly analyzes input gas temperature, fume side crushing influences for waste heat boiler economic index
Quantitative relationship, as shown in Figure 3 and Figure 4：It can be seen that efficiency influence of the fume side crushing on waste heat boiler is smaller, but fume side
The increase of crushing means the increase of combustion turbine exhaustion pressure, and the pressure at expulsion increase of gas turbine is larger.According to combustion gas wheel
The simulation analysis of machine, it can be deduced that exhaust-heat boiler flue gas side pressure damage increase has a great influence to the efficiency of gas turbine.
Steam turbine economic index：
| Parameter | Unit | x2 | x | x0 |
| High pressure main steam temperature | ℃ | 2.98E-04 | -3.27E-01 | 1.28E+02 |
| High pressure main steam pressure | Mpa | / | 0.4062 | 33.877 |
| Reheat steam temperature | ℃ | / | 0.1250 | 31.36 |
| Reheated steam crushing | % | / | -3.304E-02 | 38.73 |
| High pressure cylinder efficiency reduces | % | / | -4.615E-02 | 38.41 |
| IP efficiency reduces | % | / | -5.992E-02 | 38.41 |
| Low pressure (LP) cylinder efficiency reduces | % | / | -1.773E-01 | 38.41 |
| Back pressure | kPa | -2.80E-02 | -1.15E-01 | 38.14 |
The fitting formula coefficient that the steam turbine economic index of table 4 influences relation on steam turbine efficiency collects combined cycle
Unit：
The fitting formula coefficient that the economic index of table 5 influences relation on combined cycle generation efficiency collects
The thermodynamic argument of table 6 calculates and the Small Indicators of Thermoflow simulation calculations change to Combined Cycle Unit economy
Influence Comparative result
As can be seen from Table 6, thermodynamic argument parameter changes the influence ratio to Combined Cycle Unit economy
The result of Thermoflow simulation calculations is high, is primarily due in established devonshire thermodynamic model between some indexs not
It is separate, the result calculated is not the influence value of the parameter independent change, so thermodynamic argument meter occurs
Calculate the higher phenomenon of result.
By above-mentioned elaboration, those skilled in the art can implement.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (10)
1. a kind of F levels single shaft gas Steam Combined Cycle hot systems, including generator, gas turbine group and vapor wheel unit, institute
State gas turbine group and vapor wheel unit be connected with generator, it is characterised in that：The gas turbine group includes being sequentially communicated
Compressor, combustion chamber and combustion gas turbine, vapor wheel unit includes waste heat boiler, high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, the high pressure
Cylinder, intermediate pressure cylinder and low pressure (LP) cylinder are connected with waste heat boiler respectively.
2. F levels single shaft gas Steam Combined Cycle hot systems according to claim 1, it is characterised in that：The air cylinder
The external air of air input, the delivery outlet connection combustion chamber of the compressor, the natural gas input of combustion chamber is external natural
Gas, the input of the output end connection combustion gas turbine of combustion chamber, the flue gas output end of combustion gas turbine are connected with waste heat boiler.
3. F levels single shaft gas Steam Combined Cycle hot systems according to claim 1, it is characterised in that：The vapor wheel
Unit also includes condenser, and the condenser is connected with the output end of low pressure (LP) cylinder.
4. F levels single shaft gas Steam Combined Cycle hot systems according to claim 2, it is characterised in that：The vapor wheel
Unit also includes condensate pump, and the output end of condenser is connected by the condensate of condensate pump with the input of waste heat boiler.
5. F levels single shaft gas Steam Combined Cycle hot systems according to claim 1, it is characterised in that：The high pressure cylinder,
Intermediate pressure cylinder and low pressure (LP) cylinder are sequentially connected.
A kind of 6. F levels single shaft gas steam combined cycle power generating Unit Economic index system, using F levels described in any right 1-5
Single shaft gas Steam Combined Cycle hot systems, it is characterised in that：Step is as follows：
(1) combined cycle generating unit economic target system framework is built
Full factory's technical-economic index is classified according to the attribute of equipment and system first, structure combined cycle generating unit warp
Ji property index system structural framing, using level of factory overall target as top layer index, is successively decomposed according to mechanism relation between index, until
Monitor the bottom Small Indicators of adjustment；
(2) analysis of combined cycle generating unit technical-economic index
Research work based on step (1), the calculating and monitoring of Unit Economic index can be achieved, to clear between index mutually
Influence relation and index of correlation change are carried out further index analysis work, mainly included to unit economy influence degree：
(A) analysis of relation is influenceed between levels index：By quantitative analysis, index of correlation is obtained to upper level index
Influence coefficient；
(B) index power consumption analysis：Differential analysis calculating is consumed by running Small Indicators to Combined Cycle Unit, quantifies operations staff
Grasping operating index influences the degree of unit economy, in order to intuitively, with knowing the secondary from the primary adjust unit operation.
7. F levels single shaft gas steam combined cycle power generating Unit Economic index system according to claim 1, its feature exist
In：In the step (1), the combined cycle generating unit economic target system is divided into five indexs：
First class index：Power supply gas consumption (power supplying efficiency, power supply heat consumption)；
Two-level index：Directly affect first class index, including delivery, generating gas consumption (generating efficiency, generating heat consumption)；
Three-level index：Directly affect two-level index, including generated energy, station-service electricity/rate, gas turbine proficiency, waste heat boiler effect
Rate, turbine efficiency, pipeline efficiency and fuel index；
Level Four index：Three-level index is directly affected, including the index of correlation of influence generated energy, the correlation of influence station-service electricity refer to
Mark, the index for influenceing gas turbine proficiency, the index for influenceing turbine efficiency, the index for influenceing waste heat boiler efficiency, influence pipe
The index of road efficiency, the index for influenceing fuel mass and the index for influenceing quantity of fuel；
Pyatyi index：The index that can be directly monitored during production run, including ambient parameter, compressor inlet pressure drop, pressure
Mechanism of qi delivery temperature and pressure, combustion gas turbine delivery temperature, pressure and flow, high pressure main steam condition, reheated steam parameter and
Turbine discharge parameter.
8. F levels single shaft gas steam combined cycle power generating Unit Economic index system according to claim 1, its feature exist
In：In the step (2),
(1) theoretical calculation based on thermodynamic principles
The mechanism relation established by thermodynamics method before levels index, and analyzed based on this after lower floor's index changes to upper
The quantitative effect of layer index, being somebody's turn to do the method for the theoretical calculation analysis based on thermodynamic principles includes method of small deviations and equivalent enthalpy drop
Method；
(2) simulation calculation based on Thermoflow
Based on Thermoflow simulation calculation softwares, the thermodynamics simulation model of Combined Cycle Unit and each equipment is established, is gone forward side by side
Row variable condition calculation, analyze the quantitative effect relation between each index.
9. F levels single shaft gas steam combined cycle power generating Unit Economic index system according to claim 8, its feature exist
In：The equivalent enthalpy drop method：It is poor that the consumption of calculating turbine parameters is analyzed using equivalent enthalpy drop method, calculates the equivalent enthalpy drop of steam
Changes delta H and steam turbine cycle caloric receptivity Q changes delta Q, so as to calculate turbine efficiency relative variation,
I.e.：
In formula：ηst--- turbine efficiency, %；
δηst--- turbine efficiency relative variation, %；
H --- steam-turbine equivalent enthalpy drop, kJ/kg；Three-pressure reheat steam turbine includes the total equivalent of high, medium and low voltage steam
Enthalpy drop；
Δ H --- steam turbine acting capacity variation amount, kJ/kg caused by a certain Parameters variation；
Δ Q --- the change of thermal loss of steam turbine amount, kJ caused by a certain Parameters variation；
Establish the consumption differential mode type of each parameter of steam turbine respectively below with equivalent enthalpy drop method：
(1) main steam pressure
△Hhp=△ h0-αzr△h2 (2)
△Qhp=△ h0-αzr△h2 (3)
In formula：△Hhp--- acting capacity variation, kJ/kg caused by main steam pressure change；
△Qhp--- the change of caloric receptivity, kJ caused by main steam pressure change；
△h0--- main steam specific enthalpy variable quantity, kJ/kg；
αzr--- reheated steam share, %；
△h2--- high pressure cylinder specific enthalpy of exhaust steam variable quantity, kJ/kg.
(2) main steam temperature
△Hht=△ h0-αzr△h2 (4)
△Qht=△ h0-αzr△h2 (5)
In formula：△Hht--- acting capacity variation, kJ/kg caused by main steam temperature change；
△Qht--- the change of caloric receptivity, kJ caused by main steam temperature change；
(3) reheated steam crushing
△Hzp=-αzr△h2 (6)
△Qzp=-αzr△h2 (7)
In formula：△Hzp--- acting capacity variation, kJ/kg caused by the change of reheating crushing；
△Qzp--- the change of caloric receptivity, kJ caused by the change of reheating crushing；
(4) reheat steam temperature
△Hzt=αzr△hzr-αc△hc (8)
△Qhp=αzr△hzr (9)
In formula：△Hzt--- acting capacity variation, kJ/kg caused by reheat steam temperature change；
△Qhp--- caloric receptivity change, kJ caused by reheat steam temperature change；
△hzr--- reheated steam is than enthalpy change, kJ/kg；
αc--- condenser steam discharge share, %；
△hc--- turbine discharge specific enthalpy variable quantity, kJ/kg.
(5) low-pressure steam pressure
△Hlp=αl△hl-αc△hc (10)
△Qlp=αl△hl (11)
In formula：△Hlp--- acting capacity variation, kJ/kg caused by low-pressure steam pressure change；
△Qlp--- caloric receptivity change, kJ caused by low-pressure steam pressure change；
αl--- low-pressure steam share, %；
△hl--- low-pressure steam specific enthalpy variable quantity, kJ/kg.
(6) low-pressure steam temperature
△Hlt=αl△hl-αc△hc (12)
△Qlt=αl△hl (13)
In formula：△Hlt--- acting capacity variation, kJ/kg caused by low-pressure steam temperature change；
△Qlt--- caloric receptivity change, kJ caused by low-pressure steam temperature change；
(7) back pressure
△Hpq=-αc△hc (14)
△Qpq=0 (15)
In formula：△Hpq--- acting capacity variation, kJ/kg caused by economy；
△Qpq--- caloric receptivity variable quantity, kJ.
10. F levels single shaft gas steam combined cycle power generating Unit Economic index system according to claim 8, its feature
It is：The method of small deviations：For analyzing the high, medium and low cylinder pressure efficiency change of steam turbine to influence caused by unit economy.
Turbine efficiency：
In formula：Hh--- it is steam turbine high-pressure cylinder isentropic enthalpy drop, kJ/kg；
Hi--- Steam Turbine Through IP Admission isentropic enthalpy drop, kJ/kg；
Hl--- turbine low pressure cylinder isentropic enthalpy drop, kJ/kg；
ηh--- steam turbine high-pressure cylinder efficiency, %；
ηi--- Steam Turbine Through IP Admission efficiency, %；
ηl--- turbine low pressure cylinder efficiency, %；
Q --- thermal loss of steam turbine amount, kJ.
Assuming that thermal loss of steam turbine amount Q is constant, then
In formula：Wh、Wi、Wl--- the high, medium and low cylinder pressure output work of steam turbine, kW；
For reheat-type unit, influence of the preceding cylinder of consideration to rear cylinder；Need to be modified above formula：
In formula：Q --- thermal loss of steam turbine rate, kJ/kWh；
β --- IP efficiency changes the modifying factor for causing efficiency change, general β=0.70~0.75.
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Effective date of registration: 20230705 Address after: No. 200, gongkang Road, Gongshu District, Hangzhou City, Zhejiang Province, 310015 Patentee after: HANGZHOU HUADIAN BANSHAN POWER GENERATION Co.,Ltd. Patentee after: HUADIAN ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Address before: No. 200, gongkang Road, Gongshu District, Hangzhou City, Zhejiang Province, 310015 Patentee before: HANGZHOU HUADIAN BANSHAN POWER GENERATION Co.,Ltd. |