Method and device for determining power supply efficiency of gas-steam combined cycle unit

Abstract

The invention discloses a method and device for determining the power supply efficiency of a gas-steam combined cycle unit, and relates to the technical field of energy efficiency analysis of generator sets, and the method comprises the steps: obtaining design parameters and operation parameters of the gas-steam combined cycle unit; according to the design parameters and the operation parameters, the actual power ratio of gas and steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine are determined; and determining the actual power supply efficiency of the unit according to the actual power ratio of the gas steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine. According to the method and device for determining the power supply efficiency of the gas-steam combined cycle unit, the actual power supply efficiency of the unit can be determined, and energy efficiency analysis of the gas-steam combined cycle unit is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy efficiency analysis of generator sets, and in particular to a method and device for determining power supply efficiency of a gas-steam combined cycle unit. Background Art

[0002] As the number and proportion of renewable energy sources such as photovoltaics and wind power connected to the power grid gradually increase, the volatility and intermittency of renewable energy power generation will also multiply their impact, which will bring greater challenges to the safe and stable operation of the power system. Under the current power grid planning method and structure, power plants with sufficient capacity and flexible start and stop are needed to adjust the peak and valley of power grid load. On the one hand, natural gas power generation has the advantages of flexible operation, short start and stop time, fast climbing rate, and strong regulation performance. Compared with peak-shaving power sources such as coal-fired power generation, pumped storage, and battery energy storage, it is the peak-shaving power source with the best response characteristics, power generation cost, and power supply continuity. On the other hand, compared with coal-fired power generation, natural gas power generation is cleaner and lower-carbon, and will become an important transitional power source in the new power system with new energy as the main body.

[0003] As the proportion of natural gas power generation installed capacity gradually increases, it is necessary to conduct energy efficiency analysis on the energy consumption level of gas-fired power generation units, achieve high-quality development of gas-fired power generation, and ensure the construction of new power systems and the realization of energy-saving goals. Summary of the invention

[0004] An embodiment of the present invention provides a method for determining power supply efficiency of a gas-steam combined cycle unit, which can realize energy efficiency analysis of the gas-steam combined cycle unit. The method includes:

[0005] Obtain the design parameters and operating parameters of the gas-steam combined cycle unit;

[0006] Determining the actual gas-steam power ratio, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and the operating parameters;

[0007] The actual power supply efficiency of the unit is determined according to the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

[0008] In some embodiments, determining the actual gas-steam power ratio, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and the operating parameters includes:

[0009] Determining the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine according to the design parameters and the operating parameters;

[0010] The actual power ratio of gas to steam is calculated based on the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine.

[0011] In some embodiments, determining the design efficiency of the gas turbine and the actual efficiency of the gas turbine according to the design parameters and the operating parameters includes:

[0012] Calculate the temperature difference between the gas turbine design inlet temperature and the ambient temperature during actual operation;

[0013] Calculate the excess air coefficient based on the oxygen content measured at the tail of the waste heat boiler;

[0014] Calculate the design efficiency of the gas turbine based on the design power of the gas turbine, the design gas flow rate of the gas turbine and the low calorific value of the gas during operation;

[0015] The actual efficiency of the gas turbine is calculated based on the design efficiency of the gas turbine, the temperature difference, the specific heat capacity of the fuel gas, the specific heat capacity of the combustion air, the excess air coefficient and the low calorific value of the fuel gas during operation.

[0016] In some embodiments, the actual efficiency of the gas turbine is calculated according to the following formula:

[0017]

[0018] In the formula,

[0019] η GT represent the design efficiency and actual efficiency of the gas turbine respectively;

[0020] It represents the design power of the gas turbine;

[0021] It represents the design gas flow rate of the gas turbine;

[0022] Q ar,net Indicates the low heating value of gas during operation;

[0023] The volume of air required for the combustion of a unit volume of gas is determined by the composition of the gas according to the laws of the combustion reaction;

[0024] c p,gas 、c p,a They represent the specific heat capacity of the fuel gas and the specific heat capacity of the combustion air respectively;

[0025] α represents the coefficient of excess air, O2 represents the oxygen content measured at the tail of the waste heat boiler;

[0026] Δt represents the difference between the actual operating ambient temperature and the designed ambient temperature.

[0027] In some embodiments, determining the design efficiency of the waste heat boiler and the actual efficiency of the waste heat boiler according to the design parameters and the operating parameters includes:

[0028] The design efficiency of the waste heat boiler is calculated based on the boiler output heat, the actual power of the gas turbine, the specific heat of the flue gas generated after the combustion of the gas volume, the specific heat capacity of the flue gas generated by the gas, the actual gas turbine outlet temperature and the design ambient temperature;

[0029] The actual efficiency of the waste heat boiler is calculated according to the design efficiency of the waste heat boiler, the actual gas turbine outlet temperature, the design ambient temperature and the actual ambient temperature.

[0030] In some embodiments, the waste heat boiler design efficiency and the waste heat boiler actual efficiency are calculated according to the following formula:

[0031]

[0032] In the formula,

[0033] η HRSG They represent the design efficiency and actual efficiency of the waste heat boiler respectively;

[0034] Q1 represents the heat output of the boiler;

[0035] G GT Indicates the actual gas flow of the gas turbine;

[0036] V fg The volume of flue gas produced after the combustion of gas; V fg =1+αV a 0 ;

[0037] c p,fg Indicates the specific heat capacity of flue gas produced by fuel gas;

[0038] t GT,lv Indicates the actual turbine outlet temperature;

[0039] t a Represent the design ambient temperature and the actual ambient temperature respectively.

[0040] In some embodiments, the design parameters include the steam turbine design efficiency; the actual efficiency of the steam turbine is calculated according to the following formula:

[0041]

[0042] In the formula,

[0043] η T represent the design efficiency and actual efficiency of the steam turbine respectively;

[0044] f(t cw ) represents the curve of the change of steam turbine efficiency with ambient temperature, which is provided by the equipment supplier and can be determined by experiment;

[0045] t cw Indicates the ambient temperature expressed by the water temperature at the inlet of the power tower.

[0046] In some embodiments, the design power ratio of the gas turbine and the steam turbine and the actual power ratio of the gas and steam are calculated according to the following formula:

[0047]

[0048] In the formula,

[0049] r GS denote the design power ratio and actual power ratio of gas turbine and steam turbine respectively;

[0050] It indicates the designed power supply of gas turbine;

[0051] It indicates the designed power supply of steam turbine;

[0052] Q GT Indicates 1m 3 The heat of gas combustion, i.e. Q ar,net ;

[0053] Q GT,lv Indicates the heat carried by the flue gas at the inlet of the waste heat boiler;

[0054] η GT represent the design efficiency and actual efficiency of the gas turbine respectively;

[0055] η HRSG They represent the design efficiency and actual efficiency of the waste heat boiler respectively;

[0056] η ST They represent the design efficiency and actual efficiency of the steam turbine respectively.

[0057] In some embodiments, the method further comprises:

[0058] According to the actual efficiency of the steam turbine, the design efficiency of the steam turbine, the actual power ratio of the gas and steam, and the design power ratio of the gas turbine and the steam turbine, the change in the overall power supply efficiency of the computer group is calculated. In some embodiments, the method further includes:

[0059] The computer group designs the power supply efficiency based on the design efficiency of the steam turbine, the design power ratio of the gas turbine and the steam turbine, and the design efficiency of the gas turbine;

[0060] The change in the power supply coal consumption of the computer group is calculated based on the change in power supply efficiency, the designed power supply efficiency of the unit and the designed power supply coal consumption of the unit.

[0061] The present application also provides a device for determining power supply efficiency of a gas-steam combined cycle unit, comprising:

[0062] An acquisition module, used to acquire design parameters and operating parameters of a gas-steam combined cycle unit;

[0063] A first determination module is used to determine the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine according to the design parameters and the operating parameters;

[0064] The second determination module is used to determine the actual power supply efficiency of the unit according to the actual power ratio of gas to steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

[0065] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for determining the power supply efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0066] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for determining the power supply efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0067] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for determining the power supply efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0068] The method and device for determining the power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention obtain the design parameters and operating parameters of the gas-steam combined cycle unit; determine the actual power ratio of gas and steam, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and operating parameters; and determine the actual power supply efficiency of the unit according to the actual power ratio of gas and steam, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine. In this way, the actual power supply efficiency of the unit can be calculated based on the design parameters and operating parameters of the gas-steam combined cycle unit, thereby realizing the energy efficiency analysis of the gas-steam combined cycle unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0070] Figure 1 A schematic flow chart of a method for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0071] Figure 2 A partial flow chart of a method for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0072] Figure 3 A partial flow chart of a method for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0073] Figure 4 A partial flow chart of a method for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0074] Figure 5 A partial flow chart of a method for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0075] Figure 6 A schematic structural diagram of a device for determining power supply efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0076] Figure 7 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0077] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0078] The information collected in the technical solution of the present invention is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with the relevant laws, regulations and standards of the relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0079] The acquisition, transmission, storage, use, and processing of data in the technical solution of the present invention are in compliance with the relevant provisions of national laws and regulations.

[0080] It should be noted that in the embodiments of the present invention, certain software, components, models and other existing solutions in the industry may be mentioned, which should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present invention, but it does not mean that the inventor has or will necessarily use the solution.

[0081] In order to solve at least one of the above problems existing in the prior art, in a first aspect, the present invention provides a method for determining the power supply efficiency of a gas-steam combined cycle unit, such as Figure 1 As shown, the present invention provides a method for determining power supply efficiency of a gas-steam combined cycle unit, comprising:

[0082] S11. Obtaining design parameters and operating parameters of the gas-steam combined cycle unit;

[0083] S12, determining the actual gas-steam power ratio, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and the operating parameters;

[0084] S13. Determine the actual power supply efficiency of the unit according to the actual power ratio of gas to steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

[0085] Specifically, the design parameters may include the rated power, combustion chamber temperature, pressure ratio, turbine inlet temperature, etc. of the gas turbine and steam turbine. The operating parameters may include the temperature, pressure, flow rate, etc. in actual operation.

[0086] Gas-steam actual power ratio: refers to the ratio of the actual output power of the gas turbine and the steam turbine. It can be determined by the actual output power data.

[0087] Actual efficiency of gas turbine: can be determined by gas turbine output power and fuel input heat. Fuel input heat can be calculated by the low calorific value of fuel and fuel flow rate.

[0088] Actual efficiency of steam turbine: It can be determined based on the design parameters and actual operating parameters of the steam turbine, such as steam pressure, temperature and flow rate, as well as output power.

[0089] The actual power supply efficiency of the unit: refers to the power supply efficiency of the entire combined cycle unit, which can be calculated based on the generator output power and fuel input heat. The generator output power here is the result of the combined action of the gas turbine and the steam turbine, and the fuel input heat can be calculated based on the low calorific value of the fuel and the fuel flow rate.

[0090] In actual applications, the determination of these parameters needs to be combined with specific equipment and operating conditions, and may also need to consider environmental factors, equipment aging, maintenance conditions, etc. Compared with the design values, the actual operation may be different due to many factors.

[0091] For specific calculations, specific operating data and design parameters are required, including but not limited to the calorific value of the fuel, the efficiency curves of the gas turbine and steam turbine, the power output in actual operation, etc. These data are usually provided by the equipment manufacturer or obtained through field tests.

[0092] The method for determining the power supply efficiency of a gas-steam combined cycle unit provided in the embodiment of the present application obtains the design parameters and operating parameters of the gas-steam combined cycle unit; determines the actual power ratio of gas and steam, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and operating parameters; and determines the actual power supply efficiency of the unit according to the actual power ratio of gas and steam, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine. In this way, the actual power supply efficiency of the unit can be calculated based on the design parameters and operating parameters of the gas-steam combined cycle unit, thereby realizing the energy efficiency analysis of the gas-steam combined cycle unit.

[0093] like Figure 2 As shown, in some embodiments, the above step S12 includes:

[0094] S121. Determine, according to the design parameters and the operating parameters, the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine;

[0095] S122. Calculate the actual power ratio of gas to steam based on the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine.

[0096] Specifically, in a gas-steam combined cycle system, the design efficiency and actual efficiency of each component are key parameters for evaluating the performance of the entire system.

[0097] The design efficiency of a gas turbine refers to the efficiency of a gas turbine in converting thermal energy into mechanical energy under ideal conditions. It can be calculated theoretically and depends mainly on parameters such as the temperature of the combustion chamber, the pressure ratio, and the turbine.

[0098] The actual efficiency of a gas turbine refers to the efficiency of a gas turbine under actual operating conditions. It is affected by many factors, such as combustion efficiency, turbine cooling, compressor efficiency, exhaust loss, etc.

[0099] The design efficiency of the waste heat boiler refers to the efficiency of the waste heat boiler in recovering the exhaust heat of the gas turbine and converting it into steam or hot water under ideal operating conditions. The design efficiency takes into account the optimal operating conditions and the ideal thermodynamic cycle.

[0100] The actual efficiency of the waste heat boiler refers to the efficiency of the waste heat boiler under actual operating conditions. It will be affected by factors such as flue gas temperature, flow rate, boiler heat transfer efficiency, and exhaust gas temperature.

[0101] The design efficiency of a steam turbine refers to the efficiency of a steam turbine in converting steam thermal energy into mechanical energy under ideal conditions. It can be calculated based on the temperature, pressure and enthalpy of the steam.

[0102] The actual efficiency of a steam turbine refers to the efficiency of a steam turbine under actual operating conditions. The actual efficiency is affected by factors such as steam conditions, internal losses of the turbine, and mechanical friction.

[0103] The design power ratio of gas turbines and steam turbines refers to the ratio of steam cycle output power to gas cycle output power during the design phase. This ratio helps to understand the relative importance and contribution of each cycle in the combined cycle.

[0104] The actual power ratio of gas to steam refers to the ratio of the steam cycle output power to the gas cycle output power in actual operation. This ratio will change according to the actual operating parameters and efficiency changes.

[0105] In order to calculate the actual power ratio of gas to steam, we can first calculate the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine and the design power ratio of the gas turbine and steam turbine based on the design parameters and operating parameters; and then calculate the actual power ratio of gas to steam based on these parameters.

[0106] like Figure 3 As shown, in some embodiments, determining the design efficiency of the gas turbine and the actual efficiency of the gas turbine according to the design parameters and the operating parameters includes:

[0107] S1211. Calculate the temperature difference between the designed inlet temperature of the gas turbine and the ambient temperature during actual operation;

[0108] Specifically, Δt can be used to represent the difference between the actual operating ambient temperature and the design ambient temperature. t GT,en Indicates the operating environment temperature, Indicates the design ambient temperature.

[0109] S1212. Calculate the excess air coefficient based on the oxygen content measured at the tail of the waste heat boiler;

[0110] Specifically, α can be used to represent the excess air coefficient, which is selected by the designer during design (about 3.5). O2 represents the oxygen content measured at the tail of the waste heat boiler.

[0111] S1213. Calculate the design efficiency of the gas turbine based on the design power of the gas turbine, the design gas flow rate of the gas turbine, and the low calorific value of the gas during operation;

[0112] Specifically, the design efficiency of the gas turbine can be calculated according to the following formula:

[0113]

[0114] In the formula,

[0115] represents the design efficiency of the gas turbine;

[0116] It represents the design power of the gas turbine;

[0117] It represents the design gas flow rate of the gas turbine;

[0118] Q ar，net Indicates the low heating value of gas during operation.

[0119] S1214. Calculate the actual efficiency of the gas turbine based on the design efficiency of the gas turbine, the temperature difference, the specific heat capacity of the fuel gas, the specific heat capacity of the combustion air, the excess air coefficient, and the low calorific value of the fuel gas during operation.

[0120] Specifically, the actual efficiency of the gas turbine can be calculated according to the following formula:

[0121]

[0122] In the formula,

[0123] η GT represent the design efficiency and actual efficiency of the gas turbine respectively;

[0124] It represents the design power of the gas turbine;

[0125] It represents the design gas flow rate of the gas turbine;

[0126] c p，gas 、c p，a They represent the specific heat capacity of the fuel gas and the specific heat capacity of the combustion air, respectively, which are determined by their respective physical property curves;

[0127] α represents the coefficient of excess air;

[0128] Δt represents the difference between the actual operating ambient temperature and the designed ambient temperature;

[0129] Q ar,net Indicates the low heating value of gas during operation;

[0130] It indicates the volume of air required for the combustion of a unit volume of gas, which is determined by the composition of the gas according to the laws of the combustion reaction.

[0131] Thus, the effect of ambient temperature changes on the actual efficiency of the gas turbine can be calculated.

[0132] In other embodiments, the actual efficiency of the gas turbine may be calculated according to the following formula:

[0133]

[0134] like Figure 4 As shown, in some embodiments, determining the design efficiency of the waste heat boiler and the actual efficiency of the waste heat boiler according to the design parameters and the operating parameters includes:

[0135] S1215, calculating the design efficiency of the waste heat boiler according to the boiler output heat during operation, the actual power of the gas turbine, the specific heat of the flue gas generated after the combustion of the gas per the flue gas volume, the specific heat capacity of the flue gas generated by the gas, the actual gas turbine outlet temperature, and the design ambient temperature;

[0136] Specifically, the design efficiency of the waste heat boiler can be calculated according to the following formula:

[0137]

[0138] In the formula,

[0139] Indicates the design efficiency of the waste heat boiler;

[0140] Q1 represents the heat output of the boiler;

[0141] G GT Indicates the actual gas flow of the gas turbine;

[0142] V fg The volume of flue gas produced after the combustion of gas is expressed as flue gas volume;

[0143] c p,fg Indicates the specific heat capacity of flue gas produced by fuel gas;

[0144] t GT,lv Indicates the actual turbine outlet temperature;

[0145] Indicates the design ambient temperature.

[0146] S1216. Calculate the actual efficiency of the waste heat boiler according to the design efficiency of the waste heat boiler, the actual gas turbine outlet temperature, the design ambient temperature and the actual ambient temperature.

[0147] Specifically, the actual efficiency of the waste heat boiler can be calculated according to the following formula:

[0148]

[0149] In the formula,

[0150] η HRSG Indicates the actual efficiency of the waste heat boiler;

[0151] Indicates the design efficiency of the waste heat boiler;

[0152] t GT,lv Indicates the actual turbine outlet temperature;

[0153] , represents the design ambient temperature;

[0154] ta Indicates the actual ambient temperature.

[0155] Thus, the effect of ambient temperature on the actual efficiency of the waste heat boiler can be calculated.

[0156] In other embodiments, the actual efficiency of the waste heat boiler can be calculated according to the following formula:

[0157]

[0158] In the formula,

[0159] η HRSG Indicates the actual efficiency of the waste heat boiler;

[0160] Q1 represents the heat output of the boiler;

[0161] G GT Indicates the actual gas flow of the gas turbine;

[0162] V fg The volume of flue gas produced after the combustion of gas is expressed as flue gas volume;

[0163] c p,fg Indicates the specific heat capacity of flue gas produced by fuel gas;

[0164] t GT,lv Indicates the actual turbine outlet temperature;

[0165] t a Indicates the actual ambient temperature.

[0166] In some embodiments, the design parameters include the steam turbine design efficiency; the actual efficiency of the steam turbine is calculated according to the following formula:

[0167]

[0168] In the formula,

[0169] η T represent the design efficiency and actual efficiency of the steam turbine respectively;

[0170] f(t cw ) represents the curve of the change of steam turbine efficiency with ambient temperature, which is provided by the equipment supplier and can be determined by experiment;

[0171] t cw Indicates the ambient temperature expressed by the water temperature at the inlet of the power tower.

[0172] From this, the effect of ambient temperature on the actual efficiency of the steam turbine can be calculated.

[0173] In some embodiments, the design power ratio of the gas turbine and the steam turbine and the actual power ratio of the gas and steam are calculated according to the following formula:

[0174]

[0175] In the formula,

[0176] r GS denote the design power ratio and actual power ratio of gas turbine and steam turbine respectively;

[0177] It indicates the designed power supply of gas turbine;

[0178] It indicates the designed power supply of steam turbine;

[0179] Q GT Represents lm 3 The heat of gas combustion, i.e. Q ar,net ;

[0180] Q GT，lv Indicates the heat carried by the flue gas at the inlet of the waste heat boiler;

[0181] η GT represent the design efficiency and actual efficiency of the gas turbine respectively;

[0182] η HRSG They represent the design efficiency and actual efficiency of the waste heat boiler respectively;

[0183] η ST They represent the design efficiency and actual efficiency of the steam turbine respectively.

[0184] In other embodiments, the actual gas-steam power ratio can be calculated according to the following formula:

[0185]

[0186] In the formula,

[0187] r GS Indicates the actual power ratio of gas and steam;

[0188] E GT Indicates the actual power supply of the gas turbine;

[0189] E ST Indicates the actual power supply of the steam turbine;

[0190] Q GT Indicates 1m 3 The heat of gas combustion, i.e. Q ar,net ;

[0191] η GT Indicates the actual efficiency of the gas turbine;

[0192] Q GT,lv Indicates the heat carried by the flue gas at the inlet of the waste heat boiler;

[0193] η HRSG Indicates the actual efficiency of the waste heat boiler;

[0194] η ST Indicates the actual efficiency of the steam turbine.

[0195] In some embodiments, the power supply efficiency of the combined cycle unit is calculated according to the following formula:

[0196]

[0197] In the formula,

[0198] η E Indicates the power supply efficiency of the combined cycle unit;

[0199] η GT Indicates the actual efficiency of the gas turbine;

[0200] r GS Indicates the actual power ratio of gas and steam;

[0201] η ST Indicates the actual efficiency of the steam turbine.

[0202] In some embodiments, the method further comprises: calculating a change in the overall power supply efficiency of the computer group according to the actual efficiency of the steam turbine, the design efficiency of the steam turbine, the actual power ratio of gas to steam, and the design power ratio of the gas turbine and the steam turbine.

[0203] Specifically, the change in the overall power supply efficiency of the computer group can be calculated according to the following formula:

[0204]

[0205] In the formula,

[0206] Δη E Indicates the change in the overall power supply efficiency of the unit;

[0207] η ST Indicates the actual efficiency of the steam turbine;

[0208] represents the design efficiency of the steam turbine;

[0209] r GS Indicates the actual power ratio of gas and steam;

[0210] Represents the design power ratio of gas turbine and steam turbine.

[0211] like Figure 5 As shown, in some embodiments, the method further includes:

[0212] S14. Calculate the design power supply efficiency of the computer group based on the design efficiency of the steam turbine, the design power ratio of the gas turbine and the steam turbine, and the design efficiency of the gas turbine;

[0213] S15. Calculate the change in the power supply coal consumption of the computer group according to the change in power supply efficiency, the designed power supply efficiency of the unit and the designed power supply coal consumption of the unit.

[0214] Specifically, the change in coal consumption for power supply of the computer group can be calculated according to the following formula:

[0215]

[0216] In the formula,

[0217] Δb represents the change in coal consumption for power supply of the unit;

[0218] Δη E Indicates the change in the overall power supply efficiency of the unit;

[0219] represents the design efficiency of the steam turbine;

[0220] b d Indicates the unit's designed power supply coal consumption.

[0221] In summary, the energy efficiency analysis of the gas-steam combined cycle unit provided in the present application can analyze the impact of ambient temperature changes on the energy efficiency of the unit under pure condensing conditions.

[0222] The embodiment of the present invention also provides a device for determining the power supply efficiency of a gas-steam combined cycle unit, as described in the following embodiment. Since the principle of solving the problem by the device is similar to the method for determining the power supply efficiency of a gas-steam combined cycle unit, the implementation of the device can refer to the implementation of the method for determining the power supply efficiency of a gas-steam combined cycle unit, and the repeated parts will not be repeated.

[0223] Based on the same inventive concept, the present invention also provides a device for determining power supply efficiency of a gas-steam combined cycle unit, such as Figure 6 As shown, the present invention provides a device for determining power supply efficiency of a gas-steam combined cycle unit, comprising:

[0224] An acquisition module 21 is used to acquire design parameters and operating parameters of a gas-steam combined cycle unit;

[0225] A first determination module 22, for determining the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine according to the design parameters and the operating parameters;

[0226] The second determination module 23 is used to determine the actual power supply efficiency of the unit according to the actual power ratio of gas to steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

[0227] The device for determining the power supply efficiency of a gas-steam combined cycle unit provided in the embodiment of the present application obtains the design parameters and operating parameters of the gas-steam combined cycle unit; determines the actual power supply efficiency of the unit according to the actual power supply ratio of the gas-steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine according to the design parameters and operating parameters; and determines the actual power supply efficiency of the unit according to the actual power supply ratio of the gas-steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine. In this way, the actual power supply efficiency of the unit can be calculated according to the design parameters and operating parameters of the gas-steam combined cycle unit, thereby realizing the energy efficiency analysis of the gas-steam combined cycle unit.

[0228] Figure 7 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Figure 7 As shown, the electronic device includes: a processor (processor) 301, a memory (memory) 302 and a bus 303.

[0229] The processor 301 and the memory 302 communicate with each other via the bus 303 .

[0230] The processor 301 is used to call the program instructions in the memory 302 to execute the methods provided by the above method embodiments.

[0231] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for determining the power supply efficiency of the gas-steam combined cycle unit is implemented.

[0232] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method for determining the power supply efficiency of a gas-steam combined cycle unit is implemented.

[0233] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0234] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0235] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0236] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0237] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for determining power supply efficiency of a gas-steam combined cycle unit, characterized in that: include: Obtain the design parameters and operating parameters of the gas-steam combined cycle unit; Determining the actual gas-steam power ratio, the actual efficiency of the gas turbine, and the actual efficiency of the steam turbine according to the design parameters and the operating parameters; The actual power supply efficiency of the unit is determined according to the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

2. The method according to claim 1, characterized in that According to the design parameters and the operating parameters, the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine are determined, including: Determining the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine according to the design parameters and the operating parameters; The actual power ratio of gas to steam is calculated based on the design efficiency of the gas turbine, the actual efficiency of the gas turbine, the design efficiency of the waste heat boiler, the actual efficiency of the waste heat boiler, the design efficiency of the steam turbine, the actual efficiency of the steam turbine, and the design power ratio of the gas turbine and the steam turbine.

3. The method according to claim 2, characterized in that Determining the design efficiency of the gas turbine and the actual efficiency of the gas turbine according to the design parameters and the operating parameters includes: Calculate the temperature difference between the gas turbine design inlet temperature and the ambient temperature during actual operation; Calculate the excess air coefficient based on the oxygen content measured at the tail of the waste heat boiler; Calculate the design efficiency of the gas turbine based on the design power of the gas turbine, the design gas flow rate of the gas turbine and the low calorific value of the gas during operation; The actual efficiency of the gas turbine is calculated based on the design efficiency of the gas turbine, the temperature difference, the specific heat capacity of the fuel gas, the specific heat capacity of the combustion air, the excess air coefficient and the low calorific value of the fuel gas during operation.

4. The method according to claim 3, characterized in that The actual efficiency of the gas turbine is calculated according to the following formula: In the formula, η GT represent the design efficiency and actual efficiency of the gas turbine respectively; It represents the design power of the gas turbine; It represents the design gas flow rate of the gas turbine; Q ar，net Indicates the low heating value of gas during operation; It indicates the volume of air required for the combustion of a unit volume of gas, which is determined by the composition of the gas according to the laws of the combustion reaction; c p，gas 、c p，a They represent the specific heat capacity of the fuel gas and the specific heat capacity of the combustion air respectively; α represents the coefficient of excess air, O2 represents the oxygen content measured at the tail of the waste heat boiler; Δt represents the difference between the actual operating ambient temperature and the designed ambient temperature.

5. The method according to claim 2, characterized in that: According to the design parameters and the operating parameters, the design efficiency of the waste heat boiler and the actual efficiency of the waste heat boiler are determined, including: The design efficiency of the waste heat boiler is calculated based on the boiler output heat, the actual power of the gas turbine, the specific heat of the flue gas generated after the combustion of the gas volume, the specific heat capacity of the flue gas generated by the gas, the actual gas turbine outlet temperature and the design ambient temperature; The actual efficiency of the waste heat boiler is calculated according to the design efficiency of the waste heat boiler, the actual gas turbine outlet temperature, the design ambient temperature and the actual ambient temperature.

6. The method according to claim 5, characterized in that The design efficiency and actual efficiency of the waste heat boiler are calculated according to the following formula: In the formula, η HRSG They represent the design efficiency and actual efficiency of the waste heat boiler respectively; Q1 represents the heat output of the boiler; G GT Indicates the actual gas flow of the gas turbine; V fg The volume of flue gas produced after the combustion of gas is expressed as flue gas volume; c p，fg Indicates the specific heat capacity of flue gas produced by fuel gas; t GT，lv Indicates the actual turbine outlet temperature; t a Represent the design ambient temperature and the actual ambient temperature respectively.

7. The method according to claim 2, characterized in that The design parameters include steam turbine design efficiency; The actual efficiency of the steam turbine is calculated according to the following formula: In the formula, η T represent the design efficiency and actual efficiency of the steam turbine respectively; f(t cw ) represents the curve showing the variation of steam turbine efficiency with ambient temperature; t cw Indicates the ambient temperature expressed by the water temperature at the inlet of the power tower.

8. The method according to claim 2, characterized in that: The design power ratio of the gas turbine and steam turbine and the actual power ratio of gas and steam are calculated according to the following formula: In the formula, r GS denote the design power ratio and actual power ratio of gas turbine and steam turbine respectively; It indicates the designed power supply of gas turbine; It indicates the designed power supply of steam turbine; Q GT Indicates 1m 3 The heat of gas combustion, i.e. Q ar，net ; Q GT，lv Indicates the heat carried by the flue gas at the inlet of the waste heat boiler; η GT represent the design efficiency and actual efficiency of the gas turbine respectively; η HRSG They represent the design efficiency and actual efficiency of the waste heat boiler respectively; η ST They represent the design efficiency and actual efficiency of the steam turbine respectively.

9. The method according to claim 2, characterized in that: The method further comprises: The change in the overall power supply efficiency of the computer group is calculated based on the actual efficiency of the steam turbine, the design efficiency of the steam turbine, the actual power ratio of gas to steam, and the design power ratio of the gas turbine and steam turbine.

10. The method according to claim 9, characterized in that The method further comprises: The computer group designs the power supply efficiency based on the design efficiency of the steam turbine, the design power ratio of the gas turbine and the steam turbine, and the design efficiency of the gas turbine; The change in the power supply coal consumption of the computer group is calculated based on the change in power supply efficiency, the designed power supply efficiency of the unit and the designed power supply coal consumption of the unit.

11. A device for determining power supply efficiency of a gas-steam combined cycle unit, characterized in that: include: An acquisition module, used to acquire design parameters and operating parameters of a gas-steam combined cycle unit; A first determination module is used to determine the actual gas-steam power ratio, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine according to the design parameters and the operating parameters; The second determination module is used to determine the actual power supply efficiency of the unit according to the actual power ratio of gas to steam, the actual efficiency of the gas turbine and the actual efficiency of the steam turbine.

12. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 10 is implemented.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

14. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

Images