Gas-steam combined cycle unit energy efficiency analysis method and device

Abstract

The invention discloses an energy efficiency analysis method and device for 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 the operation parameters of the gas-steam combined cycle unit; according to the operation parameters, power supply coal consumption of a steam turbine unit under the current operation condition, the gas-steam power ratio of the gas-steam combined cycle unit under the current operation condition, power supply coal consumption of the steam turbine unit under the pure condensation condition and the gas-steam power ratio of the gas-steam combined cycle unit under the pure condensation condition are determined; according to the power supply coal consumption of the steam turbine unit under the current operation condition, the gas-steam power ratio under the current operation condition, the power supply coal consumption of the steam turbine unit under the pure condensing condition, the gas-steam power ratio under the pure condensing condition and the actual coal consumption value under the current heat supply condition, the power supply coal consumption value of the unit under the pure condensing condition is determined; and according to the power supply coal consumption value of the unit under the pure condensing condition and a preset limit value, the energy efficiency management level of the power plant on the gas-steam combined cycle unit is determined.

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 energy efficiency analysis 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 analyzing energy efficiency of a gas-steam combined cycle unit, which can realize energy efficiency analysis of a gas-steam combined cycle unit. The method includes:

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

[0006] According to the operating parameters, determining the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions;

[0007] Determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions;

[0008] The energy efficiency management level of the gas-steam combined cycle unit by the power plant is determined based on the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and the preset limit value.

[0009] In some embodiments, according to the operating parameters, determining the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions includes:

[0010] Determine the unit heating ratio based on the ratio of the external heating heat of the steam turbine unit to the total heat at the turbine inlet under the current operating conditions;

[0011] Determine the power supply coal consumption of the steam turbine unit under the current operating conditions according to the heat supply ratio of the unit, the total heat at the inlet of the steam turbine unit under the current operating conditions, and the power supply of the steam turbine under the current operating conditions;

[0012] When the gas-steam combined cycle unit is a split-axis combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is determined according to the power supply of the gas turbine and the power supply of the steam turbine of the gas-steam combined cycle unit under the current operating conditions; when the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is determined according to the total power supply, load rate, gas flow rate of the gas turbine and low calorific value of the gas of the gas-steam combined cycle unit under the current operating conditions;

[0013] Determine the steam extraction efficiency of each steam extraction point according to the operating parameters and the steam extraction position of each steam extraction point of the gas-steam combined cycle unit under the current operating conditions;

[0014] Determine the correction factor of the steam extraction heating for the power supply coal consumption of the steam turbine according to the steam extraction efficiency of each steam extraction point and the operating parameters;

[0015] Determining the power supply coal consumption of the steam turbine unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions and the correction factor;

[0016] The gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions is determined according to the gas turbine power supply, steam turbine power supply, steam extraction efficiency and the heat supply provided by the steam turbine unit under current operating conditions.

[0017] In some embodiments, the power supply coal consumption of the steam turbine unit under the current operating conditions is calculated according to the following formula:

[0018]

[0019] In the formula,

[0020] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0021] B ST It indicates the total heat at the inlet of the steam turbine unit under the current operating conditions converted into the amount of standard coal, D st,i Indicates the steam flow rate of the waste heat boiler sent to the steam turbine unit under the current operating conditions; h st,i It indicates the enthalpy of each steam flow rate sent from the waste heat boiler to the steam turbine unit under the current operating conditions, which is determined by the steam property table based on the pressure and temperature of the steam; D w,i represents the enthalpy of each water flow at the inlet of the waste heat boiler under the current operating conditions, t w,i Indicates the temperature of each water flow at the inlet of the waste heat boiler under the current operating conditions;

[0022] α H Indicates the unit heating ratio under current operating conditions, α H According to the external heating heat Q of the steam turbine unit under the current operating conditions H Total heat at turbine inlet Q T The ratio of is determined;

[0023] E ST Indicates the power supply of the turbine under the current operating conditions.

[0024] In some embodiments, when the gas-steam combined cycle unit is a split-shaft combined cycle unit, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula:

[0025]

[0026] In the formula,

[0027] r GS Indicates the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions;

[0028] m represents the ratio of the number of gas turbines to steam turbines;

[0029] E GT Indicates the power supply of the gas turbine under the current operating conditions;

[0030] E ST Indicates the power supply of the steam turbine under the current operating conditions;

[0031] When the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula:

[0032]

[0033] In the formula,

[0034] It represents the power supply of the gas turbine under the current operating conditions obtained by the conversion method;

[0035] E BTG Indicates the total power supply of the gas-steam combined cycle unit under the current operating conditions;

[0036] η GT (r GT ) represents the gas turbine at a load rate of r GT efficiency under conditions;

[0037] r GT It indicates the load rate of the combined cycle unit under the current operating conditions. G GT Indicates the standard volume flow rate of input gas under current operating conditions, G d Indicates the standard volume flow of gas under rated conditions;

[0038] Q ar,net It indicates the low calorific value of the gas under the current operating conditions, which is obtained by weighted average of the gas components according to their volume ratios.

[0039] In some embodiments, the steam extraction efficiency of each steam extraction point is determined according to the operating parameters and the steam extraction position of each steam extraction point under the current operating conditions, including:

[0040] When the heating extraction steam is extracted from the medium-pressure steam turbine or the low-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula:

[0041]

[0042] Where, η represents the steam extraction efficiency under the current operating conditions; h H It indicates the enthalpy value of the heating extraction steam under the current operating conditions, which is determined according to the extraction steam pressure and extraction steam temperature; h c Indicates the exhaust enthalpy of the steam turbine under the current operating conditions, which is determined according to the condenser pressure; t r Indicates the heating steam drain or return water temperature under current operating conditions;

[0043] When the heating extraction steam is extracted from the high-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula:

[0044]

[0045] In the formula, Δh RH It represents the enthalpy increase of the reheat steam under the current operating conditions, which is determined based on the reheat outlet steam enthalpy and the reheat steam inlet enthalpy.

[0046] In some embodiments, the correction factor of extraction steam heating for power supply coal consumption of the steam turbine is calculated according to the following formula:

[0047]

[0048] In the formula,

[0049] Indicates the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine;

[0050] α H Indicates the heating ratio of the unit under the current operating conditions;

[0051] η j It represents the steam extraction efficiency of the jth steam extraction point under the current operating conditions;

[0052] R j It represents the ratio of the heat supply provided by the jth extraction point to the equivalent heat of the power supply of the steam turbine unit under the current operating conditions;

[0053] n represents the number of extraction points.

[0054] In some embodiments, the coal consumption of the steam turbine unit for power supply under pure condensing conditions is calculated according to the following formula:

[0055]

[0056] In the formula,

[0057] It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions;

[0058] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0059] It represents the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine.

[0060] In some embodiments, the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula, including:

[0061]

[0062] In the formula,

[0063] It indicates the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions;

[0064] m represents the ratio of the number of gas turbines to steam turbines;

[0065] E GT Indicates the power supply of the gas turbine under the current operating conditions;

[0066] E ST Indicates the power supply of the steam turbine under the current operating conditions;

[0067] ΔE ST It indicates the amount of electricity that can be generated if the steam extraction from the steam turbine is not used for heating. η represents the extraction efficiency under current operating conditions, Q H It indicates the amount of heat provided by the steam turbine unit under current operating conditions.

[0068] In some embodiments, the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula:

[0069]

[0070] In the formula,

[0071] b 0 Indicates the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions;

[0072] b represents the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions;

[0073] r GS Indicates the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions;

[0074] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0075] It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions;

[0076] It represents the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions.

[0077] The present invention also provides a gas-steam combined cycle unit energy efficiency analysis device, comprising:

[0078] An acquisition module, used to acquire operating parameters of a gas-steam combined cycle unit;

[0079] The first determination module is used to determine, according to the operating parameters, the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions;

[0080] The second determination module is used to determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the gas-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions;

[0081] The third determination module is used to determine the energy efficiency management level of the gas-steam combined cycle unit of the power plant according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value.

[0082] 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 analyzing the energy efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0083] 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 analyzing the energy efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0084] 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 analyzing the energy efficiency of a gas-steam combined cycle unit described in any of the above embodiments is implemented.

[0085] The energy efficiency analysis method and device of a gas-steam combined cycle unit provided in an embodiment of the present invention obtain the operating parameters of the gas-steam combined cycle unit; determine the power supply coal consumption of the steam turbine unit under the current operating conditions, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions according to the operating parameters; determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under the current operating conditions, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions; determine the energy efficiency management level of the power plant for the gas-steam combined cycle unit according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value. In this way, the energy efficiency analysis of the gas-steam combined cycle unit is realized, and the energy efficiency management level of the gas-steam combined cycle unit of the power plant can be determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] 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:

[0087] Figure 1 A schematic flow chart of a method for analyzing energy efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0088] Figure 2 A schematic flow chart of a method for analyzing energy efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0089] Figure 3 It is a schematic diagram of a typical three-pressure, single-reheat steam thermodynamic cycle applied to a gas-steam combined cycle unit.

[0090] Figure 4 A partial flow chart of a method for analyzing energy efficiency of a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0091] Figure 5 A schematic structural diagram of an energy efficiency analysis device for a gas-steam combined cycle unit provided in an embodiment of the present invention.

[0092] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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 analyzing energy efficiency of a gas-steam combined cycle unit, such as Figure 1 As shown, the present invention provides a method for analyzing energy efficiency of a gas-steam combined cycle unit, comprising:

[0098] S101, obtaining operating parameters of a gas-steam combined cycle unit;

[0099] Specifically, the gas-steam combined cycle unit is a highly efficient power generation equipment that combines the technologies of gas turbines and steam turbines. It uses the high-temperature exhaust gas of the gas turbine to heat water to generate steam, which in turn drives the steam turbine to generate electricity, thereby improving the overall energy utilization efficiency.

[0100] During the actual operation of the unit, the operating parameters of the unit are collected. The collected operating parameters may include at least one of the following: the enthalpy value h of the heating extraction steam H , extraction steam pressure, extraction steam temperature, turbine exhaust enthalpy h c , condenser pressure, heating steam drain or return water temperature t r , enthalpy increase of reheat steam Δh RH , reheat outlet steam enthalpy, reheat steam inlet enthalpy, steam turbine unit external heating heat Q H , Total heat at turbine inlet Q T , the heat supply provided by each extraction point, the equivalent heat of the power supply of the steam turbine unit, and the power supply of the steam turbine E ST , combined cycle unit load factor r GT , the gas turbine is at a load rate of r GT The efficiency under the condition η GT (r GT ), gas standard volume flow rate G under rated conditions d , Gas turbine fuel gas flow G GT 、Gas low calorific value Q ar,net , total heat at the turbine inlet, power supply coal consumption of the turbine unit b ST , Gas turbine power supply E GT , Standard coal used by the unit for power generation Power supply of the unit E g 、Unit gas volume B GT , Total power supply E of gas-steam combined cycle unit BTG , power generation of gas turbines

[0101] S102, determining, based on the operating parameters, the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions;

[0102] In step S102, according to the operating parameters of the gas-steam combined cycle unit, the power supply coal consumption b of the steam turbine unit under the current operating conditions is calculated. ST and the gas-steam power ratio r of the gas-steam combined cycle unit under the current operating conditions GS In addition, the extraction steam heat supply is converted into work power generation in the steam turbine, and the coal consumption of the steam turbine unit under pure condensing conditions is calculated. and the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions

[0103] S103, determining the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit of the gas-steam combined cycle unit under pure condensing conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions;

[0104] In step S103, according to the actual coal consumption value of the unit under the current operating conditions and the power supply coal consumption b of the steam turbine unit, ST and the gas-steam power ratio r of the gas-steam combined cycle unit GS , and the coal consumption of steam turbine units under pure condensing conditions And the gas-steam combined cycle unit under pure condensing conditions has a gas-steam power ratio of Calculate the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions.

[0105] S104. Determine the energy efficiency management level of the gas-steam combined cycle unit in the power plant according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value.

[0106] In step S104, the power supply coal consumption value converted to the initial condensation condition is compared with the preset limit value, so as to determine the energy efficiency management level of the power plant for the gas-steam combined cycle unit. Specifically, the smaller the power supply coal consumption value converted to the initial condensation condition, the higher the energy efficiency management level of the power plant for the gas-steam combined cycle unit. If the power supply coal consumption value converted to the initial condensation condition exceeds the preset limit value, the energy efficiency management level of the power plant for the gas-steam combined cycle unit is relatively poor, and the management plan needs to be improved. Specifically, a comparison rule can be set according to actual conditions to compare the power supply coal consumption value under pure condensation conditions and the preset limit value, and an evaluation rule can be set to evaluate the energy efficiency management level of the power plant for the gas-steam combined cycle unit according to the comparison results.

[0107] The energy efficiency analysis method for a gas-steam combined cycle unit provided in an embodiment of the present invention obtains operating parameters of the gas-steam combined cycle unit; determines, according to the operating parameters, the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions; determines the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions; determines the energy efficiency management level of the power plant for the gas-steam combined cycle unit according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value. In this way, the energy efficiency analysis of the gas-steam combined cycle unit is realized, and the energy efficiency management level of the gas-steam combined cycle unit of the power plant can be determined.

[0108] like Figure 2 As shown, in some embodiments, the above step S102 may include:

[0109] S1021. Determine the unit heat supply ratio according to the ratio of the external heat supply of the steam turbine unit to the total heat supply at the steam turbine inlet under the current operating conditions;

[0110] In step S1021, the unit heating ratio α H The heat Q provided by the steam turbine unit to the outside H and the total heat at the turbine inlet Q T Ratio of:

[0111]

[0112] In the formula,

[0113] Q H Indicates the external heating quantity of the steam turbine unit under the current operating conditions;

[0114] Q T Indicates the total heat of the turbine inlet under the current operating conditions;

[0115] D represents the flow rate of each input steam at the turbine inlet under the current operating conditions.

[0116] Δh represents the enthalpy increase of each input steam at the turbine inlet under the current operating conditions.

[0117] S1022, determining the power supply coal consumption of the steam turbine unit under the current operating conditions according to the unit heat supply ratio, the total heat at the steam turbine unit inlet under the current operating conditions, and the power supply of the steam turbine under the current operating conditions;

[0118] In step S1022, the power supply coal consumption of the steam turbine unit is b ST Total heat at the inlet of the steam turbine unit and heating ratio of the unit α H , Steam turbine power supply E ST Therefore, based on these parameters, the power supply coal consumption b of the steam turbine unit can be calculated. ST .

[0119] S1023. When the gas-steam combined cycle unit is a split-axis combined cycle unit, determine the gas-steam power ratio of the gas-steam combined cycle unit under the current operating condition according to the power supply of the gas turbine and the power supply of the steam turbine of the gas-steam combined cycle unit under the current operating condition; when the gas-steam combined cycle unit is a coaxial combined cycle unit, determine the gas-steam power ratio of the gas-steam combined cycle unit under the current operating condition according to the total power supply, load rate, gas flow rate of the gas turbine and low calorific value of the gas of the gas-steam combined cycle unit under the current operating condition;

[0120] In step S1023, when the gas-steam combined cycle unit is a split-shaft combined cycle unit, the gas-steam power ratio r GS With gas turbine power supply E GT And the turbine power supply E ST The calculation is relatively simple; when the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio r GS , and the total power supply E of the gas-steam combined cycle unit BTG , combined cycle unit load factor r GT , Gas turbine fuel gas flow G GT And the low calorific value of gas Q ar,net The fuel power ratio r is calculated based on these parameters. GS , the calculation method is relatively complicated.

[0121] S1024, determining the steam extraction efficiency of each steam extraction point according to the operating parameters and the steam extraction position of each steam extraction point of the gas-steam combined cycle unit under the current operating conditions;

[0122] In step S1024, the extraction efficiency η of each extraction point may be related to the extraction pressure and extraction temperature, the condenser pressure, the heating steam drain or return water temperature, the enthalpy increase of the reheated steam, the reheat outlet steam enthalpy and / or the reheat steam inlet enthalpy value. Therefore, the extraction efficiency of each extraction point can be determined based on these parameters.

[0123] S1025, determining a correction factor of the steam extraction heating for the power supply coal consumption of the steam turbine according to the steam extraction efficiency of each steam extraction point and the operating parameters;

[0124] In step S1025, the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine is Heat supply ratio with the unit α H , the extraction efficiency of the extraction point, the heat supply provided by the extraction point, the equivalent heat of the power supply of the steam turbine unit, etc. Therefore, these intermediate parameters can be calculated according to the operating parameters, and then the correction factor can be calculated according to these intermediate parameters.

[0125] S1026. Determine the power supply coal consumption of the steam turbine unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under the current operating conditions and the correction factor;

[0126] In step S1026, the correction factor is used Coal consumption for power supply to steam turbine units ST Correction is made to obtain the coal consumption of the steam turbine unit converted to pure condensing conditions.

[0127] S1027. Determine the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions based on the gas turbine power supply, steam turbine power supply, steam extraction efficiency, and the heat supply provided by the steam extraction of the steam turbine unit under current operating conditions.

[0128] In step S1027, according to the gas turbine power supply E under the current operating conditions, GT , Steam turbine power supply E ST , extraction efficiency η and the heat supply Q provided by the steam turbine unit H , calculate the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions

[0129] In some embodiments, the above step S1022 includes:

[0130] The power supply coal consumption of the steam turbine unit under the current operating conditions is calculated according to the following formula:

[0131]

[0132] In the formula,

[0133] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0134] B ST It indicates the total heat at the inlet of the steam turbine unit under the current operating conditions converted into the amount of standard coal, D st,i Indicates the steam flow rate of the waste heat boiler sent to the steam turbine unit under the current operating conditions; h st,i It indicates the enthalpy of each steam flow rate sent from the waste heat boiler to the steam turbine unit under the current operating conditions, which is determined by the steam property table based on the pressure and temperature of the steam; D w,i represents the enthalpy of each water flow at the inlet of the waste heat boiler under the current operating conditions, t w,i Indicates the temperature of each water flow at the inlet of the waste heat boiler under the current operating conditions;

[0135] α H Indicates the unit heating ratio under current operating conditions, α H According to the external heating heat Q H Total heat at turbine inlet Q T The ratio of is determined;

[0136] E ST Indicates the power supply of the turbine under the current operating conditions.

[0137] In some embodiments, the above step S1023 includes:

[0138] When the gas-steam combined cycle unit is a split-shaft combined cycle unit, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula:

[0139]

[0140] In the formula,

[0141] r GS Indicates the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions;

[0142] m represents the ratio of the number of gas turbines to steam turbines;

[0143] E GT Indicates the power supply of the gas turbine under the current operating conditions;

[0144] E ST Indicates the power supply of the turbine under the current operating conditions.

[0145] When the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula:

[0146]

[0147] In the formula,

[0148] It represents the power supply of the gas turbine under the current operating conditions obtained by the conversion method;

[0149] E BTG Indicates the total power supply of the gas-steam combined cycle unit under the current operating conditions;

[0150] η GT (r GT ) represents the gas turbine at a load rate of r GT efficiency under conditions;

[0151] r GT It indicates the load rate of the combined cycle unit under the current operating conditions. G GT Indicates the standard volume flow rate of input gas under current operating conditions, G d Indicates the standard volume flow of gas under rated conditions;

[0152] Q ar,net It indicates the low calorific value of the gas under the current operating conditions, which is obtained by weighted average of the gas components according to their volume ratios.

[0153] Figure 3 This is a typical three-pressure, one-time reheat steam thermodynamic cycle schematic diagram applied to a gas-steam combined cycle unit. Its typical feature is that there is no heat recovery, so the steam extraction is directly through the condenser. Therefore, the above step S1024 may specifically include:

[0154] When the heating extraction steam is extracted from the medium-pressure steam turbine or the low-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula:

[0155]

[0156] Where, η represents the steam extraction efficiency under the current operating conditions; h H It indicates the enthalpy value of the heating extraction steam under the current operating conditions, which is determined according to the extraction steam pressure and extraction steam temperature; h c Indicates the exhaust enthalpy of the steam turbine under the current operating conditions, which is determined according to the condenser pressure; t r Indicates the heating steam drain or return water temperature under current operating conditions;

[0157] When the heating extraction steam is extracted from the high-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula:

[0158]

[0159] In the formula, Δh RH It represents the enthalpy increase of the reheat steam under the current operating conditions, which is determined based on the reheat outlet steam enthalpy and the reheat steam inlet enthalpy.

[0160] In some embodiments, the above step S1025 includes:

[0161] The correction factor of extraction steam heating for the power supply coal consumption of the steam turbine is calculated according to the following formula:

[0162]

[0163] In the formula,

[0164] Indicates the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine;

[0165] α H Indicates the heating ratio of the unit under the current operating conditions;

[0166] η j It represents the steam extraction efficiency of the jth steam extraction point under the current operating conditions;

[0167] R j It represents the ratio of the heat supply provided by the jth extraction point to the equivalent heat of the power supply of the steam turbine unit under the current operating conditions;

[0168] n represents the number of extraction points.

[0169] In some embodiments, considering that the amount of steam extraction heat supplied by the heating unit has a great influence on the actual energy consumption, the present invention adopts the heat-to-electricity ratio R (in the calculation When it involves) or heating ratio α H Correct the coal consumption of the power supply unit to eliminate the impact on the coal consumption. Specifically, the above step S1026 includes:

[0170] The coal consumption of steam turbine power supply under pure condensing conditions is calculated according to the following formula:

[0171]

[0172] In the formula,

[0173] It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions;

[0174] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0175] It represents the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine.

[0176] In some embodiments, the above step S1027 includes:

[0177] The gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula, including:

[0178]

[0179] In the formula,

[0180] It represents the fuel-steam power ratio under pure condensing conditions;

[0181] m represents the ratio of the number of gas turbines to steam turbines;

[0182] E GT Indicates the power supply of the gas turbine under the current operating conditions;

[0183] E ST Indicates the power supply of the steam turbine under the current operating conditions;

[0184] ΔE ST It indicates the amount of electricity that can be generated if the steam extraction from the steam turbine is not used for heating. η represents the extraction efficiency under current operating conditions, Q H It indicates the amount of heat provided by the steam turbine unit under current operating conditions.

[0185] In some embodiments, the above step S103 includes:

[0186] The power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula:

[0187]

[0188] In the formula,

[0189] b 0 Indicates the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions;

[0190] b represents the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions;

[0191] r GS Indicates the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions;

[0192] b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions;

[0193] It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions;

[0194] It represents the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions.

[0195] like Figure 4 As shown, in some embodiments, the above step S104 may include:

[0196] S1041, calculating the ratio between the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value;

[0197] S1042. Determine the energy efficiency management level of the gas-steam combined cycle unit of the power plant according to the numerical interval in which the ratio is located, wherein the numerical interval includes multiple data intervals, and each data interval maps a different energy efficiency management level.

[0198] Specifically, the preset limit value may be a limit value specified in an industry standard. According to the calculated ratio, it is compared with a preset numerical range, and each numerical range corresponds to a different energy efficiency management level.

[0199] The specific value range and the corresponding energy efficiency management level can be set according to the specific standards and management requirements of the power plant. This can help power plant managers evaluate and monitor the energy efficiency performance of gas-steam combined cycle units and take corresponding improvement measures accordingly.

[0200] The present invention also provides a gas-steam combined cycle unit energy efficiency analysis device in an embodiment, as described in the following embodiment. Since the principle of solving the problem by the device is similar to the gas-steam combined cycle unit energy efficiency analysis method, the implementation of the device can refer to the implementation of the gas-steam combined cycle unit energy efficiency analysis method, and the repeated parts will not be repeated.

[0201] Based on the same inventive concept, the present invention also provides an energy efficiency analysis device for a gas-steam combined cycle unit, such as Figure 5 As shown, the present invention provides a gas-steam combined cycle unit energy efficiency analysis device, comprising:

[0202] An acquisition module 21 is used to acquire operating parameters of a gas-steam combined cycle unit;

[0203] The first determination module 22 is used to determine the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions according to the operating parameters;

[0204] The second determination module 23 is used to determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under the current operating conditions, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions;

[0205] The third determination module 24 is used to determine the energy efficiency management level of the gas-steam combined cycle unit of the power plant according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value.

[0206] The energy efficiency analysis device for a gas-steam combined cycle unit provided in an embodiment of the present invention obtains operating parameters of the gas-steam combined cycle unit; determines, according to the operating parameters, the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions; determines the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions; determines the energy efficiency management level of the power plant for the gas-steam combined cycle unit according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value. In this way, the energy efficiency analysis of the gas-steam combined cycle unit is realized, and the energy efficiency management level of the gas-steam combined cycle unit of the power plant can be determined.

[0207] Figure 6 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 6 As shown, the electronic device includes: a processor (processor) 301, a memory (memory) 302 and a bus 303.

[0208] The processor 301 and the memory 302 communicate with each other via the bus 303 .

[0209] The processor 301 is used to call the program instructions in the memory 302 to execute the methods provided by the above method embodiments.

[0210] 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 above-mentioned gas-steam combined cycle unit energy efficiency analysis method is implemented.

[0211] 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 above-mentioned gas-steam combined cycle unit energy efficiency analysis method is implemented.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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 analyzing energy efficiency of a gas-steam combined cycle unit, characterized in that: include: Obtain the operating parameters of the gas-steam combined cycle unit; According to the operating parameters, determining the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions; Determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions; The energy efficiency management level of the gas-steam combined cycle unit by the power plant is determined based on the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and the preset limit value.

2. The method according to claim 1, characterized in that According to the operating parameters, determining the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, including: Determine the unit heating ratio based on the ratio of the external heating heat of the steam turbine unit to the total heat at the turbine inlet under the current operating conditions; Determine the power supply coal consumption of the steam turbine unit under the current operating conditions according to the heat supply ratio of the unit, the total heat at the inlet of the steam turbine unit under the current operating conditions, and the power supply of the steam turbine under the current operating conditions; When the gas-steam combined cycle unit is a split-axis combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is determined according to the power supply of the gas turbine and the power supply of the steam turbine of the gas-steam combined cycle unit under the current operating conditions; when the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is determined according to the total power supply, load rate, gas flow rate of the gas turbine and low calorific value of the gas of the gas-steam combined cycle unit under the current operating conditions; Determine the steam extraction efficiency of each steam extraction point according to the operating parameters and the steam extraction position of each steam extraction point of the gas-steam combined cycle unit under the current operating conditions; Determine the correction factor of the steam extraction heating for the power supply coal consumption of the steam turbine according to the steam extraction efficiency of each steam extraction point and the operating parameters; Determining the power supply coal consumption of the steam turbine unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions and the correction factor; The gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions is determined according to the gas turbine power supply, steam turbine power supply, steam extraction efficiency and the heat supply provided by the steam turbine unit under current operating conditions.

3. The method according to claim 2, characterized in that The power supply coal consumption of the steam turbine unit under the current operating conditions is calculated according to the following formula: In the formula, b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions; B ST It indicates the total heat at the inlet of the steam turbine unit under the current operating conditions converted into the amount of standard coal, D st,i Indicates the steam flow rate of the waste heat boiler sent to the steam turbine unit under the current operating conditions; h st,i It indicates the enthalpy of each steam flow rate sent from the waste heat boiler to the steam turbine unit under the current operating conditions, which is determined by the steam property table based on the pressure and temperature of the steam; D w,i represents the enthalpy of each water flow at the inlet of the waste heat boiler under the current operating conditions, t w,i Indicates the temperature of each water flow at the inlet of the waste heat boiler under the current operating conditions; α H Indicates the unit heating ratio under current operating conditions, α H According to the external heating heat Q of the steam turbine unit under the current operating conditions H Total heat at turbine inlet Q T The ratio of is determined; E ST Indicates the power supply of the turbine under the current operating conditions.

4. The method according to claim 2, characterized in that: When the gas-steam combined cycle unit is a split-shaft combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula: In the formula, r GS Indicates the fuel-steam power ratio of the gas-steam combined cycle unit under current operating conditions; m represents the ratio of the number of gas turbines to steam turbines; E GT Indicates the power supply of the gas turbine under the current operating conditions; E ST Indicates the power supply of the steam turbine under the current operating conditions; When the gas-steam combined cycle unit is a coaxial combined cycle unit, the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions is calculated according to the following formula: In the formula, It represents the power supply of the gas turbine under the current operating conditions obtained by the conversion method; E BTG Indicates the total power supply of the gas-steam combined cycle unit under the current operating conditions; η GT (r GT ) represents the gas turbine at a load rate of r GT efficiency under conditions; r GT It indicates the load rate of the combined cycle unit under the current operating conditions. G GT Indicates the standard volume flow rate of input gas under current operating conditions, G d Indicates the standard volume flow of gas under rated conditions; Q ar,net It indicates the low calorific value of the gas under the current operating conditions, which is obtained by weighted average of the gas components according to their volume ratios.

5. The method according to claim 2, characterized in that: According to the operating parameters and the extraction position of each extraction point under the current operating conditions, the extraction efficiency of each extraction point is determined, including: When the heating extraction steam is extracted from the medium-pressure steam turbine or the low-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula: Where, η represents the steam extraction efficiency under the current operating conditions; h H It indicates the enthalpy value of the heating extraction steam under the current operating conditions, which is determined according to the extraction steam pressure and extraction steam temperature; h c Indicates the exhaust enthalpy of the steam turbine under the current operating conditions, which is determined according to the condenser pressure; t r Indicates the heating steam drain or return water temperature under current operating conditions; When the heating extraction steam is extracted from the high-pressure steam turbine, the extraction efficiency of each extraction point is calculated according to the following formula: In the formula, Δh RH It represents the enthalpy increase of the reheat steam under the current operating conditions, which is determined based on the reheat outlet steam enthalpy and the reheat steam inlet enthalpy.

6. The method according to claim 2, characterized in that The correction factor of extraction steam heating for the power supply coal consumption of the steam turbine is calculated according to the following formula: In the formula, It indicates the correction factor of extraction steam heating for the power supply coal consumption of the steam turbine under the current operating conditions; α H Indicates the heating ratio of the unit under the current operating conditions; η j It represents the steam extraction efficiency of the jth steam extraction point under the current operating conditions; R j It represents the ratio of the heat supply provided by the jth extraction point to the equivalent heat of the power supply of the steam turbine unit under the current operating conditions; n represents the number of extraction points.

7. The method according to claim 2, characterized in that The coal consumption of steam turbine power supply under pure condensing conditions is calculated according to the following formula: In the formula, It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions; b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions; It represents the correction factor of the steam extraction heating for the power supply coal consumption of the steam turbine under the current operating conditions.

8. The method according to claim 2, characterized in that: The gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula, including: In the formula, represents the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions; m represents the ratio of the number of gas turbines to steam turbines; E GT Indicates the power supply of the gas turbine under the current operating conditions; E ST Indicates the power supply of the steam turbine under the current operating conditions; ΔE ST It indicates the amount of electricity that can be generated if the steam extraction from the steam turbine is not used for heating. η represents the extraction efficiency under current operating conditions, Q H It indicates the amount of heat provided by the steam turbine unit under current operating conditions.

9. The method according to claim 1, characterized in that: The power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions is calculated according to the following formula: In the formula, b 0 Indicates the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions; b represents the actual coal consumption value of the gas-steam combined cycle unit under the current heating conditions; r GS Indicates the gas-steam power ratio of the gas-steam combined cycle unit under the current operating conditions; b ST Indicates the power supply coal consumption of the steam turbine unit under the current operating conditions; It represents the coal consumption of steam turbine unit for power supply under pure condensing conditions; It represents the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions.

10. A gas-steam combined cycle unit energy efficiency analysis device, characterized in that: include: An acquisition module, used to acquire operating parameters of a gas-steam combined cycle unit; The first determination module is used to determine, according to the operating parameters, the power supply coal consumption of the steam turbine unit under the current operating conditions, the fuel-steam power ratio of the gas-steam combined cycle unit under the current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, and the fuel-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions; The second determination module is used to determine the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions according to the power supply coal consumption of the steam turbine unit under current operating conditions, the gas-steam power ratio of the gas-steam combined cycle unit under current operating conditions, the power supply coal consumption of the steam turbine unit under pure condensing conditions, the gas-steam power ratio of the gas-steam combined cycle unit under pure condensing conditions, and the actual coal consumption value of the gas-steam combined cycle unit under current heating conditions; The third determination module is used to determine the energy efficiency management level of the gas-steam combined cycle unit of the power plant according to the power supply coal consumption value of the gas-steam combined cycle unit under pure condensing conditions and a preset limit value.

11. 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 9 is implemented.

12. 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 9 is implemented.

13. 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 9 is implemented.

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