CN112685683A - Method for calculating gas engine power and gas engine power of single-shaft combined cycle unit - Google Patents
Method for calculating gas engine power and gas engine power of single-shaft combined cycle unit Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 135
- 239000002918 waste heat Substances 0.000 claims abstract description 82
- 239000003546 flue gas Substances 0.000 claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims description 50
- 239000012530 fluid Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 4
- QVJOLLPKYFYTIH-UBVHSMIISA-N (2s,3s,4s,5r,6s)-3,4,5-trihydroxy-6-[2-(pyridine-4-carbonyl)hydrazinyl]oxane-2-carboxylic acid Chemical compound O1[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H](O)[C@H]1NNC(=O)C1=CC=NC=C1 QVJOLLPKYFYTIH-UBVHSMIISA-N 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 description 18
- 238000005259 measurement Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
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- 238000011156 evaluation Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
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Abstract
The invention relates to a method for calculating the power of a gas turbine and the power of a single-shaft combined cycle unit, which comprises the steps of calculating the inlet flue gas parameter of a waste heat boiler through the heat balance of the waste heat boiler, calculating the power of the gas turbine through the heat balance of the gas turbine by combining the inlet flue gas parameter of the waste heat boiler, and subtracting the power of the gas turbine from the total power of the single-shaft combined cycle to obtain the power of the gas turbine. The method does not need statistics of test values of units of the same model, avoids the difficulty that the novel units have no statistical value, can be used for both the novel units and the stock units, does not need to brake and trip a steam turbine, has no safety risk, does not influence the service life of the units, is not limited by environmental conditions in use, obtains a gas turbine power analytic solution through theoretical calculation, subtracts the gas turbine power from the combined cycle total power to obtain the steam turbine power, has wide application range, fundamentally solves the problem that the coaxial combined cycle units cannot accurately know the power of the branch equipment, and has great practical value in the single-shaft combined cycle units.
Description
Technical Field
The invention belongs to the field of single-shaft combined cycle units, and particularly relates to a method for calculating the power of a combustion engine and the power of a steam turbine of a single-shaft combined cycle unit.
Background
For a gas-steam single-shaft combined cycle unit, the unit is provided with a single generator which is in rigid connection transmission with a rotor of a gas turbine and is in connection transmission with a rotor of a steam turbine through a clutch (or rigid connection). The configuration mode has the advantages of reducing initial investment, being flexible in starting mode, simplifying the lubricating oil system, being compact in arrangement and the like, and obtains the attention and the recommendation of many owners.
When the single-shaft combined cycle unit operates, the total power of the unit can be directly obtained through measurement, the total power is the sum of the power of the gas turbine and the power of the steam turbine, but the respective powers of the gas turbine and the steam turbine cannot be directly known. The combustion engine power and the steam engine power of a single-shaft combined cycle plant are currently generally determined by the following methods:
the method comprises the following steps: a formula or a curve is provided by an equipment manufacturer, a steam-combustion power ratio is obtained, and the power of a combustion engine and the power of a steam turbine are divided according to the total power of a unit. The method determines that the power of a single device always has certain deviation through a given steam-combustion power ratio curve or formula, because the curve or the formula is obtained through the statistics of test values of multiple units of the same type and is not completely suitable for a certain specific unit under different environmental conditions, the method is acceptable for the evaluation of the running state with larger tolerance, but is not strict enough if the method is used for the evaluation of the performance guarantee value of the device.
The second method comprises the following steps: firstly, performing a certain stable working condition test in a combined cycle mode to obtain data such as unit power and the like, and then changing the combined cycle operation mode from a clutch tripping steam turbine mode to single-gas turbine operation to obtain the gas turbine power under the environmental condition; and then, the total power and the engine power of the combined cycle under the same condition are obtained by correcting parameters such as environmental conditions, so that the power of the steam turbine under the operation of the combined cycle mode is obtained. The method can theoretically obtain more accurate combustion engine power and steam turbine power, but is difficult to operate, and needs to be executed in a time period with relatively stable environmental conditions, and the steam turbine is tripped to release load and needs to obtain the consent and the approval of power dispatching; in addition, the safety and the service life of the steam turbine are affected by the tripping of the steam turbine, and the power of the gas turbine and the power of the steam turbine cannot be obtained in time when the steam turbine operates in a combined cycle mode.
Disclosure of Invention
The invention aims to provide a method for calculating the gas engine power and the steam engine power of a single-shaft combined cycle unit, which can not only avoid tripping the steam engine by opening a brake, but also accurately obtain the gas engine power and the steam engine power of the single-shaft combined cycle unit.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for calculating the power of a gas turbine and the power of a single-shaft combined cycle unit comprises the steps of calculating the inlet flue gas parameter of a waste heat boiler through the heat balance of the waste heat boiler, calculating the power of the gas turbine through the heat balance of the gas turbine by combining the inlet flue gas parameter of the waste heat boiler, and subtracting the power of the gas turbine from the total power of the single-shaft combined cycle to obtain the power of the gas turbine.
Preferably, the gas turbine electrical power is calculated as in equation (1):
the electric power of the steam turbine is calculated according to the formula (2):
in the formula: electric power, Btu/h, is output by the generator; is the shaft power of the gas turbine, Btu/h; is the shaft power of the steam turbine, Btu/h.
Further preferably, in formula (1) and formula (2): the shaft power of the gas turbine is calculated according to the formula (3), and the shaft power of the steam turbine is calculated according to the formula (4):
PGT,shaft＝Qelect(3)；
in the formula: is QelectGas turbine output power, Btu/h; pGEN,shaftIs the generator shaft power, Btu/h; pGENOutputting end electric power, Btu/h, for the generator; etaGENEfficiency of the generator,%.
Further preferably, in the gas turbine heat balance calculation: calculation of gas turbine output Power Q by Heat balance equation (5)elect：
Qair+Qfuel+Qinj＝Qext+Qelect+Qloss+Qexh (5)，
In the formula: qairkW is the heat flow of the air entering the gas turbine; qfuelkW is the heat flow of the fuel entering the gas turbine; qinjIs the heat flow, kW, of the steam/water injected into the gas turbine; qextThe gas extraction heat flow of the gas compressor is kW; qlossPower loss for gas turbine machinery, kW; qexhGas turbine exhaust thermal power, kW.
Further preferably, in formula (5): heat flux/heat power QnThrough respective mass flow mnAnd enthalpy value hnCalculating the product of:
Qair＝mairhair＝(WBA+WBA)hA,IN (6)；
Qfuel＝mfuelhfuel＝mfuel(cp,fuel+qfuel) (7)；
Qinj＝minjhinj (8)；
Qext＝mexthext (9)；
Qexh＝mexhhexh＝WG,INHG,IN (10)。
further preferably, in the heat balance calculation of the waste heat boiler, the heat power Q of the flue gas entering the inlet of the waste heat boiler is calculated by a heat balance equation (11)G,IN：
QG,IN+QDB+QAA+QAS+QWF,IN＝QG,OUT+QWF,OUT+QHL (11)，
In the formula: qDBThe method comprises the following steps of (1) inputting thermal power, namely kW, to an air duct burner; qAAThe thermal power of air is afterburning, namely kW; qASIs the thermal power of the atomized steam, kW; qWF,INkW is the thermal power of the working fluid entering the waste heat boiler; qG,OUTkW is the thermal power of the flue gas leaving the waste heat boiler; qWF,OUTkW, the thermal power of the working fluid leaving the waste heat boiler; qHLIs the heat loss of the waste heat boiler, kW.
Further preferably, the flow W of the flue gas entering the inlet of the waste heat boiler is calculated by a heat balance equation (12)G,IN：
In the formula: wBATo balance the wet air flow rate, kg/s; wG,INThe flow rate of the flue gas entering the waste heat boiler is kg/s; wDBThe fuel flow of the air channel burner is kg/s; wAAThe flow rate of the afterburning air is kg/s; wASThe flow rate of the atomized steam is kg/s; qW,FINTo enter a waste heat boilerHeat flow of the working fluid, kW; qWF,OUTkW is the heat flow leaving the working fluid of the waste heat boiler; qHLHeat loss of the waste heat boiler is kW; h isA,INIs the enthalpy value of inlet air, kJ/kg; hG,INkJ/kg for the enthalpy of the flue gas entering the waste heat boiler; HV (high voltage) deviceNETkJ/kg for net calorific value; h isAIs the enthalpy value of air, kJ/kg; h isASIs the enthalpy value of the atomized steam, kJ/kg; h isG,OUTIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/kg; h isA,OUTThe outlet air enthalpy, kJ/kg.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention does not need to count the test values of the units of the same model, avoids the difficulty that the novel unit has no statistical value, can be used by both the novel unit and the stock unit, does not need to brake and trip a steam turbine, has no safety risk, does not influence the service life of the unit, is not limited by environmental conditions when being used by the method, obtains the power analytic solution of the gas turbine through theoretical calculation, subtracts the power of the gas turbine from the total power of the combined cycle to obtain the power of the steam turbine, has wide application range, is limited by inorganic types, has no environmental condition, fundamentally solves the problem that the coaxial combined cycle unit cannot accurately know the power of the branch equipment, and has great practical value in the single-shaft combined cycle unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for calculating the power of gas turbine and the power of single-shaft combined cycle set includes such steps as calculating the parameters (flow, components and component fractions) of inlet fume of afterheat boiler by heat balance of afterheat boiler, calculating the output power of gas turbine by heat balance of gas turbine after the detailed parameters of gas turbine are known, and calculating the power of turbine by subtracting the total power of single-shaft combined cycle from the power of gas turbine. The following details describe the calculation method of this embodiment:
1. and (4) calculating the heat balance of the waste heat boiler.
The gas turbine exhaust flow, composition is first determined by waste heat boiler heat balance, and to calculate the gas turbine exhaust composition, sufficient gas turbine side data is required to determine the exhaust enthalpy value, and if a stack combustor is put into operation in the unit, the changes in gas composition and heat input are also taken into account.
The gas turbine and the waste heat boiler are regarded as a whole, the flue gas at the inlet of the waste heat boiler is the exhaust gas of the gas turbine, the air, the fuel gas and the steam/water at the inlet of the gas turbine finally enter a flue of the waste heat boiler, the substances entering the gas turbine can be accurately measured except the air, and the air flow passing through the gas turbine is the only unknown parameter. The total heat released in the flue of the waste heat boiler is equal to the sum of the heat absorbed by the working medium and the heat loss. In determining the gas composition entering and exiting the waste heat boiler, the air flow of the gas turbine is divided into two parts: the consumed air is combusted with air at equilibrium temperature. The flow rate of air consumed by combustion is completely determined by the combustion chemical reaction corresponding to the complete combustion of the fuel; the flow rate of the air with the balanced temperature is only wet air, and the air flow rate is obtained through heat balance calculation of the waste heat boiler. The total heat released by the exhaust gas of the gas turbine in the waste heat boiler is equal to the difference between the enthalpy values of the inlet and outlet gases of the waste heat boiler multiplied by the respective flow rates.
The flue gas flow is determined by energy balance: the heat entering the waste heat boiler is related to the exhaust heat of the gas turbine, the heat brought by the flue combustor and the heat carried by the working medium entering the waste heat boiler; the heat leaving the waste heat boiler is related to the exhaust heat of the waste heat boiler, the heat of the output working medium of the waste heat boiler and the heat loss, and the heat balance equation is as follows:
QG,IN+QDB+QAA+QAS+QWF,IN＝QG,OUT+QWF,OUT+QHL，
in the formula: qDBThe method comprises the following steps of (1) inputting thermal power, namely kW, to an air duct burner; qAAThe thermal power of air is afterburning, namely kW; qASIs the thermal power of the atomized steam, kW; qWF,INkW is the thermal power of the working fluid entering the waste heat boiler; qG,OUTkW is the thermal power of the flue gas leaving the waste heat boiler; qWF,OUTkW, the thermal power of the working fluid leaving the waste heat boiler; qHLIs the heat loss of the waste heat boiler, kW.
Each of these is known in addition to the inlet and outlet flue gas heat. The inlet and outlet flue gas heat is respectively defined as the product of the flue gas flow and the inlet and outlet flue gas enthalpy values, and the flue gas enthalpy values refer to the intermediate calculation process; the flue gas flow is equal to the air flow into the gas turbine plus the gas turbine fuel quantity and all steam injection/water flows. Therefore, the only unknown is the amount of air flow that is not measured.
The air entering the gas turbine and not measuring the flow is divided into two parts, one part is used for complete combustion, the other part is used for heat balance, and the heat carried by the inlet and outlet flue gas of the waste heat boiler is also divided into two parts: one part is the flue gas generated by the combustion of the fuel plus the heat carried by the other make-up stream, and the other part is the heat carried by the excess air flow for heat balance.
For pure combustion flue gas, the flue gas flow and components of the inlet waste heat boiler are determined based on the combustion of fuel consumed by a gas turbine according to the stoichiometric ratio and all injected steam/water, and the flue gas flow generated by a flue combustor is also measured, namely the flue gas flow and the components at the outlet of the waste heat boiler are determined, so that the heat carried by the pure fuel combustion flue gas at the inlet and the outlet of the waste heat boiler can be determined. The balance air flow is wet air, the enthalpy value of air entering and exiting the waste heat boiler is known, therefore, the balance air flow is determined, and the flue gas flow entering the waste heat boiler is equal to the sum of the balance air flow entering the waste heat boiler and the combustion flue gas flow. In the following heat balance equation, only the balance air flow is the only unknown parameter, and can be directly solved by the waste heat boiler inlet energy which is the waste heat boiler outlet energy:
in the formula: wBATo balance the wet air flow rate, kg/s; wG,INThe flow rate of the flue gas entering the waste heat boiler is kg/s; wDBThe flow rate of the fuel of the air duct burner is kg/s; wAAThe flow rate of the afterburning air is kg/s; wASThe flow rate of the atomized steam is kg/s; qW,FINkW is the heat flow of the working fluid entering the waste heat boiler; qWF,OUTkW is the heat flow leaving the working fluid of the waste heat boiler; qHLHeat loss of the waste heat boiler is kW; h isA,INIs the enthalpy value of inlet air, kJ/kg; hG,INkJ/kg for the enthalpy of the flue gas entering the waste heat boiler; HV (high voltage) deviceNETkJ/kg for net calorific value; h isAIs the enthalpy value of air, kJ/kg; h isASIs the enthalpy value of the atomized steam, kJ/kg; h isG,OUTIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/kg; h isA,OUTThe outlet air enthalpy, kJ/kg.
From the above heat balance calculation of the waste heat boiler, the only unknown quantity in the heat balance formula of the waste heat boiler is: the balance air flow can be directly solved, so far, the flue gas flow W at the inlet of the waste heat boilerG,INAnd thermal power QG,INIt can be known.
2. And calculating the heat balance of the gas turbine.
The heat balance of the gas turbine relates to the shaft power of the gas turbine and the exhaust energy of the gas turbine, the system inlet energy in the heat balance of the gas turbine is fuel, air and injected steam/water entering the gas turbine, and the system outlet energy is the exhaust energy of the gas turbine, the generated electric energy, the air exhaust of the gas compressor and the heat loss. The inlet energy is the outlet energy, and the calculation formula is as follows:
Qair+Qfuel+Qinj＝Qext+Qelect+Qloss+Qexh，
in the formula: qairkW is the heat flow of the air entering the gas turbine; qfuelkW is the heat flow of the fuel entering the gas turbine; qinjFor injecting fuelSteam/water heat flow of a gas turbine, kW; qextThe gas extraction heat flow of the gas compressor is kW; qlossPower loss of a gas turbine machine is kW; qexhGas turbine exhaust thermal power, kW.
Above heat power Q of air, fuel and flue gasnCan pass through respective enthalpy values hnWith mass flow mnThe product of (a) is obtained by:
Qair＝mairhair，
Qfuel＝mfuelhfuel＝mfuel(cp,fuel+qfuel)，
Qinj＝minjhinj，
Qext＝mexthext，
Qexh＝mexhhexh，
the balance air flow W is obtained when the heat balance of the waste heat boiler is calculatedBAAnd combustion air flow rate WACThe sum of these flows is the total air flow entering the gas turbine, and the air enthalpy is calculated in a consistent manner, so that:
Qair＝mairhair＝(WBA+WBA)hA,IN。
accurate inlet fuel parameters can be obtained by accurately metering the inlet fuel of the gas turbine, and parameters such as detailed components and heat values of the fuel can be obtained by testing the fuel, so that the heat flow Q brought into the gas turbine by the fuelfuelComprises the following steps:
Qfuel＝mfuelhfuel＝mfuel(cp,fuel+qfuel)。
parameters such as flow, temperature, pressure and the like of steam/water injected at the inlet of the gas turbine are obtained through measurement, and the calculation formula is as follows:
Qinj＝minjhinj。
the gas compressor of the gas turbine has less air extraction amount, is mainly used for preventing asthma, sealing and the like, the flow, the pressure and the temperature of the gas compressor are obtained through actual measurement, or the design value can be used in consideration of the small using amount and little influence on the calculation result, and the heat flow calculation formula is as follows:
Qext＝mexthext。
the air enthalpy value can be calculated in a mode recommended in the middle process of heat balance calculation of the waste heat boiler.
The losses of a gas turbine usually include mechanical losses and heat dissipation losses, each of which is obtained by: the mechanical power loss of the gas turbine is obtained by a formula or a curve given by a manufacturer. When the gas turbine runs, the rotating speed is a fixed value of 3000r/min, so that the mechanical loss of the rotor is not changed greatly and can take a design value; the heat dissipation loss of the gas turbine is found by a formula or a curve provided by a manufacturer.
The exhaust gas of the gas turbine directly enters the waste heat boiler, the heat flow of the inlet flue gas of the waste heat boiler is equal to the heat flow of the exhaust gas of the gas turbine, and the inlet flue gas flow, the enthalpy value and the heat flow of the waste heat boiler are obtained through heat balance calculation of the waste heat boiler. Thus:
Qexh＝mexhhexh＝WG,INHG,IN。
as is clear from the above analysis, in the gas turbine heat balance equation, only the gas turbine power is an unknown quantity, and the others are known quantities, and therefore, the gas turbine power value is obtained as:
Qelect＝Qext+Qloss+Qexh-(Qair+Qfuel+Qinj)。
the single shaft combined cycle generator is driven by the gas turbine and the steam turbine simultaneously, therefore, the shaft work of the generator is equal to the sum of the shaft power of the gas turbine and the shaft power of the steam turbine, namely:
in the formula: is QelectGas turbine output power, Btu/h; pGEN,shaftFor generator shaftsPower, Btu/h; pGENElectric power of output end of the generator, Btu/h; etaGENEfficiency of the generator,%.
Gas turbine shaft power equal to gas turbine power PGT,shaft＝QelectAnd gas turbine power has been obtained by heat balance calculations; single shaft combined cycle electric power PGENThe generator efficiency may be determined in actual measurements or using design values for known values. Therefore, in the above equation, only one unknown quantity of turbine shaft power is calculated as follows:
gas turbine shaft power PGT,shaftAnd the shaft power P of the steam turbineST,shaftAre all determined by calculation, the generator electric power PGENAlso determined as measurements.
Thus, the gas turbine electrical power is:
the electric power of the steam turbine is:
in summary, the electric power split calculations for the gas turbine and the steam turbine of the single shaft combined cycle plant are completed.
In this embodiment: in the process of calculating the heat balance of the waste heat boiler and the heat balance of the gas turbine, the prior art is adopted for calculating the intermediate steps, details are not repeated here, and only the titles of part of the intermediate steps are listed as follows (the detailed calculation steps of the intermediate steps can be obtained in ASME PTC4.4-2008 gas turbine waste heat boiler performance test regulations and ASME PTC22-2005 gas turbine performance test regulations, wherein the heat value of the gas can be calculated by referring to ASTMD3588-98(2017), DL/T1605 and the like).
(1) Calculating the air component;
(2) molar flow variation caused by combustion of gas;
(3) molar flow variation caused by fuel combustion;
(4) the calorific value of the fuel gas;
(5) the calorific value of the fuel oil;
(6) gas and enthalpy;
(7) the waste heat boiler inlet flue gas (namely the exhaust gas of the gas turbine);
(8) and the heat dissipation loss of the waste heat boiler.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A method for calculating the gas engine power and the steam engine power of a single-shaft combined cycle unit is characterized by comprising the following steps of: the method comprises the steps of calculating the inlet flue gas parameter of the waste heat boiler through the heat balance of the waste heat boiler, calculating the power of a gas turbine through the heat balance of the gas turbine by combining the inlet flue gas parameter of the waste heat boiler, and subtracting the power of the gas turbine from the total power of a single-shaft combined cycle to obtain the power of the steam turbine.
2. The method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 1, wherein: the electric power of the gas turbine is calculated according to the formula (1):
the electric power of the steam turbine is calculated according to the formula (2):
in the formula: pGENElectric power, Btu/h, is output by the generator; pGT,shaftIs the shaft power of the gas turbine, Btu/h; pST,shaftIs the shaft power of the steam turbine, Btu/h.
3. The method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 2, wherein: in the formulas (1) and (2): gas turbine shaft power PGT,shaftCalculated according to equation (3), turbine shaft power PST,shaftCalculating according to the formula (4):
PGT,shaft＝Qelect (3)；
in the formula: is QelectGas turbine output power, Btu/h; pGEN,shaftIs the generator shaft power, Btu/h; pGENElectric power, Btu/h, is output by the generator; etaGENEfficiency of the generator,%.
4. The method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 3, wherein: in the gas turbine heat balance calculation: calculation of gas turbine output power Q by the Heat balance equation (5)elect：
Qair+Qfuel+Qinj＝Qext+Qelect+Qloss+Qexh (5)，
In the formula: qairkW is the heat flow of the air entering the gas turbine; qfuelkW is the heat flow of the fuel entering the gas turbine; qinjIs the heat flow, kW, of the steam/water injected into the gas turbine; qextThe gas extraction heat flow of the gas compressor is kW; qlossPower loss for gas turbine machinery, kW; qexhGas turbine exhaust thermal power, kW.
5. The method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 4, wherein: in formula (5): heat flux/heat power QnThrough respective mass flow mnAnd enthalpy value hnThe product of (a) and (b) is calculated:
Qair＝mairhair＝(WBA+WBA)hA,IN (6)；
Qfuel＝mfuelhfuel＝mfuel(cp,fuel+qfuel) (7)；
Qinj＝minjhinj (8)；
Qext＝mexthext (9)；
Qexh＝mexhhexh＝WG,INHG,IN (10)。
6. the method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 5, wherein: in the heat balance calculation of the waste heat boiler, the heat power Q of the flue gas entering the inlet of the waste heat boiler is calculated through a heat balance equation (11)G,IN：
QG,IN+QDB+QAA+QAS+QWF,IN＝QG,OUT+QWF,OUT+QHL (11)，
In the formula: qDBThe method comprises the following steps of (1) inputting thermal power, namely kW, to an air duct burner; qAAThe thermal power of air is afterburning, namely kW; qASkW is the thermal power of the atomized steam; qWF,INkW is the thermal power of the working fluid entering the waste heat boiler; qG,OUTkW is the thermal power of the flue gas leaving the waste heat boiler; qWF,OUTkW, the thermal power of the working fluid leaving the waste heat boiler; qHLIs the heat loss of the waste heat boiler, kW.
7. The method of calculating single shaft combined cycle plant gas power and steam turbine power of claim 6, wherein: by the heat balance equation (12)Calculating the flow W of the flue gas entering the inlet of the waste heat boilerG,IN：
In the formula: wBATo balance the wet air flow rate, kg/s; wG,INThe flow rate of the flue gas entering the waste heat boiler is kg/s; wDBThe fuel flow of the air duct burner is kg/s; wAAThe flow rate of the afterburning air is kg/s; wASThe flow rate of the atomized steam is kg/s; qW,FINkW is the heat flow of the working fluid entering the waste heat boiler; qWF,OUTkW is the heat flow leaving the working fluid of the waste heat boiler; qHLHeat loss of the waste heat boiler is kW; h isA,INIs the enthalpy value of inlet air, kJ/kg; hG,INkJ/kg for the enthalpy of the flue gas entering the waste heat boiler; HV (high voltage) deviceNETkJ/kg for net calorific value; h isAIs the enthalpy value of air, kJ/kg; h isASIs the enthalpy value of the atomized steam, kJ/kg; h isG,OUTIs the enthalpy value of the smoke at the outlet of the waste heat boiler, kJ/kg; h isA,OUTThe outlet air enthalpy, kJ/kg.
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| CN114088409A (en) * | 2021-11-23 | 2022-02-25 | 上海电气燃气轮机有限公司 | Partial load performance test method for gas-steam combined cycle single-shaft unit |
| CN114088409B (en) * | 2021-11-23 | 2024-03-08 | 上海电气燃气轮机有限公司 | Partial load performance test method for gas-steam combined cycle single-shaft unit |
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