Control method of gas turbine combined cycle cogeneration system and related device

Abstract

The invention discloses a control method for a gas turbine combined cycle combined heat and power system and a related device, and the method comprises the steps: obtaining different variable working condition adjustment modes based on a full working condition model and an afterburning type waste heat boiler model of the gas turbine combined cycle combined heat and power system; according to the thermoelectric operation domain of the gas turbine combined cycle combined heat and power supply system, an optimal operation scheme containing a variable working condition adjusting mode and afterburning temperature is determined in the thermoelectric operation domain according to heat and electricity load requirements of a user side, that is, an appropriate operation scheme combining the afterburning temperature and the variable working condition adjusting mode is matched according to the load requirements; the gas turbine combined cycle heat and power cogeneration system is controlled according to the optimal operation scheme, the heat supply flexibility of the gas turbine combined cycle system can be greatly improved, the power generation load of the gas turbine combined cycle heat and power cogeneration system is greatly reduced when the heat supply requirement is met, and the renewable energy consumption space is improved for a unit.

Description

Technical Field

[0001] The invention relates to a control method and a related device for a gas turbine combined cycle cogeneration system, belonging to the technical field of gas power generation. Background Art

[0002] In the context of dual carbon emissions, renewable energy accounts for an increasingly higher proportion of energy. At the same time, renewable energy is intermittent and volatile, which will have a huge impact on the safe operation of the power grid. Gas turbines have the advantage of fast regulation speed and can be used to smooth out fluctuations in renewable energy.

[0003] See also Figure 1 At present, the gas turbine combined cycle cogeneration system generally includes a supplementary burning waste heat boiler. The supplementary burning waste heat boiler installs a supplementary burning device at the inlet, uses the internal space as a combustion chamber, and increases the flue gas temperature entering the waste heat boiler by supplementing the combustion fuel. At the same time, the supplementary burning waste heat boiler can adjust the flue gas temperature by adjusting the amount of fuel in the supplementary burning device, so as to ensure the steam production of the waste heat boiler when the gas turbine load is reduced, thereby ensuring the heating capacity of the gas turbine combined cycle cogeneration system. However, the gas turbine combined cycle cogeneration unit often operates in a "heat-to-electricity" mode, which will reduce the heating flexibility of the gas turbine combined cycle cogeneration system. Summary of the invention

[0004] The present invention provides a control method and related devices for a gas turbine combined cycle cogeneration system, which solve the problems disclosed in the background technology.

[0005] According to one aspect of the present disclosure, a control method for a gas turbine combined cycle cogeneration system is provided, comprising:

[0006] According to the full operating model of the gas turbine combined cycle cogeneration system, the flue gas flow rate changes of the gas turbine under different electrical loads and different operating conditions are obtained;

[0007] According to the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system and the change of flue gas flow, the change of steam production of the supplementary-fired waste heat boiler under different supplementary-fired temperatures is obtained;

[0008] According to the changes in flue gas flow and steam production, the changes in heat and electricity loads of the gas turbine combined cycle cogeneration system under different variable operating conditions and different supplementary combustion temperatures are obtained;

[0009] According to the changes in heat and electricity loads under variable operating conditions, the thermal and electric operation domain of the gas turbine combined cycle heat and power system under different variable operating condition adjustment modes and different supplementary combustion temperatures is obtained;

[0010] According to the heat and electricity load demands on the user side, an optimal operation scheme including variable operating condition adjustment mode and supplementary combustion temperature is obtained in the thermal power operation domain, and the gas turbine combined cycle heat and power system is controlled according to the optimal operation scheme.

[0011] In some embodiments of the present disclosure, a full-operating-condition model of a gas turbine combined cycle cogeneration system includes a combustion chamber model and a gas turbine model;

[0012] The combustion chamber model is:

[0013] ;

[0014] In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber, LHV is the lower heating value;

[0015] The gas turbine model is:

[0016] ;

[0017] Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

[0018] In some embodiments of the present disclosure, the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system is:

[0019] ;

[0020] ;

[0021] In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

[0022] In some embodiments of the present disclosure, according to the heat and electricity load requirements on the user side, a preferred operation scheme including a variable operating condition adjustment mode and a supplementary combustion temperature is obtained in the thermal power operation domain, including:

[0023] Find all operation plans that meet the heat and electricity load requirements of the user side from the thermal power operation domain; among which, the operation plan is the operation plan of the gas turbine combined cycle cogeneration system;

[0024] All operation plans are traversed. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is taken as the preferred operation plan.

[0025] According to another aspect of the present disclosure, a control device for a gas turbine combined cycle cogeneration system is provided, comprising:

[0026] The flue gas flow module obtains the flue gas flow changes of the gas turbine under different electrical loads and different variable operating conditions according to the full operating condition model of the gas turbine combined cycle heat and power system;

[0027] The steam production module obtains the change of steam production of the supplementary-fired waste heat boiler under different supplementary-fired temperatures according to the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system and the change of flue gas flow rate;

[0028] The load module obtains the changes in thermal and electrical loads of the gas turbine combined cycle cogeneration system under different variable operating conditions and different supplementary combustion temperatures according to the changes in flue gas flow and steam production;

[0029] The thermal power operation domain module obtains the thermal power operation domain of the gas turbine combined cycle heat and power system under different variable operating condition adjustment modes and different supplementary combustion temperatures according to the changes in thermal and electrical loads under variable operating conditions;

[0030] The optimal control module obtains the optimal operation scheme including the variable operating condition adjustment mode and the supplementary combustion temperature in the thermal power operation domain according to the heat and electricity load demand on the user side, and controls the gas turbine combined cycle heat and power system according to the optimal operation scheme.

[0031] In some embodiments of the present disclosure, in the flue gas flow module, the full operating model of the gas turbine combined cycle cogeneration system includes a combustion chamber model and a gas turbine model;

[0032] The combustion chamber model is:

[0033] ;

[0034] In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber, LHV is the lower heating value;

[0035] The gas turbine model is:

[0036] ;

[0037] Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

[0038] In some embodiments of the present disclosure, in the steam production module, the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system is:

[0039] ;

[0040] ;

[0041] In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

[0042] In some embodiments of the present disclosure, in the optimal control module, according to the thermal and electrical load requirements on the user side, an optimal operation scheme including a variable operating condition adjustment mode and a supplementary combustion temperature is obtained in the thermal power operation domain, including:

[0043] Find all operation plans that meet the heat and electricity load requirements of the user side from the thermal power operation domain; among which, the operation plan is the operation plan of the gas turbine combined cycle cogeneration system;

[0044] All operation plans are traversed. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is taken as the preferred operation plan.

[0045] According to another aspect of the present disclosure, a computer-readable storage medium is provided, which stores one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to execute a control method for a gas turbine combined cycle cogeneration system.

[0046] According to another aspect of the present disclosure, a computer device is provided, comprising one or more processors and one or more memories, wherein one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a control method for a gas turbine combined cycle cogeneration system.

[0047] The beneficial effects achieved by the present invention are as follows: Based on the full operating condition model of the gas turbine combined cycle cogeneration system and the supplementary burning waste heat boiler model, the present invention obtains the thermal power operation domain of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment modes and different supplementary burning temperatures, and determines the preferred operating scheme including the variable operating condition adjustment mode and the supplementary burning temperature in the thermal power operation domain according to the user-side heat and electricity load requirements, that is, an operating scheme combining the appropriate supplementary burning temperature with the variable operating condition adjustment mode according to the load demand, and controls the gas turbine combined cycle cogeneration system according to the preferred operating scheme, which can greatly improve the heating flexibility of the gas turbine combined cycle system, and when meeting the heating demand, greatly reduce the power generation load of the gas turbine combined cycle cogeneration system, thereby increasing the renewable energy consumption space for the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of a gas turbine combined cycle cogeneration system;

[0049] Figure 2 A flow chart of a control method for a gas turbine combined cycle cogeneration system;

[0050] Figure 3 It is the first thermoelectric operation domain;

[0051] Figure 4 It is the second thermoelectric operation domain;

[0052] Figure 5 This is a block diagram of a gas turbine combined cycle cogeneration device. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0054] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0055] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0056] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0057] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0058] It should be noted that similar symbols and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

[0059] In order to solve the problem that the "heat-to-electricity" method reduces the heating flexibility of a gas turbine combined cycle cogeneration system, the present disclosure proposes a control method and related devices for a gas turbine combined cycle cogeneration system, specifically an operation scheme that combines a suitable supplementary combustion temperature with a variable operating condition adjustment method according to the heat and electricity load demands on the user side.

[0060] Figure 1 Schematic diagram of an embodiment of a control method for a gas turbine combined cycle cogeneration system disclosed in the present invention. Figure 1 The embodiments may be executed by a control server of a gas turbine combined cycle cogeneration system.

[0061] like Figure 1 As shown, step 1 of the embodiment is to obtain the flue gas flow change of the gas turbine in different variable operating condition adjustment modes under different electrical loads according to the full operating condition model of the gas turbine combined cycle cogeneration system.

[0062] It should be noted that the commonly used variable operating condition adjustment methods for gas turbines include the equal T3-equal T4 adjustment method and the equal T3 adjustment method; among them, the equal T3-equal T4 adjustment method is: starting from 100% gas turbine load to reduce the load, at this time, adjust the IGV (inlet guide vane) to keep T3 (gas turbine inlet flue gas temperature) unchanged, when the IGV is adjusted to the maximum opening, at this time, keep T4 (gas turbine outlet flue gas temperature unchanged), and finally adjust the combustion chamber fuel quantity to continue to reduce the load; the equal T3 adjustment method is: starting from 100% gas turbine load to reduce the load, at this time, adjust the IGV (inlet guide vane) to keep T3 (gas turbine inlet flue gas temperature) unchanged, when the IGV is adjusted to the maximum opening, at this time, only adjust the combustion chamber fuel quantity to continue to reduce the load. Different adjustment methods have different flue gas temperatures and flue gas flow rates entering the waste heat boiler under different gas turbine loads, so different adjustment methods can be selected under different heat and electricity load requirements.

[0063] It should be noted that the full operating condition model of the gas turbine combined cycle cogeneration system mainly includes the combustion chamber model and the gas turbine model.

[0064] The combustion chamber model can be:

[0065] ;

[0066] In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber, LHV is the lower heating value;

[0067] Gas turbine models can be:

[0068] ;

[0069] Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

[0070] Based on the above model, in the equal T3-equal T4 regulation mode, firstly, when the load is reduced, the IGV (inlet guide vane) is adjusted to keep T3 unchanged. At this time, based on the compressor flow characteristic curve and combined with the combustion chamber fuel amount, the matching compressor pressure ratio and compressor air flow are obtained to obtain the flue gas flow. When the IGV opening reaches the maximum, T4 is kept unchanged. At this time, based on the compressor flow characteristic curve and combined with the combustion chamber fuel amount, the flue gas flow is obtained. Finally, the load is reduced by adjusting the fuel amount. At this time, based on the compressor flow characteristic curve and combined with the combustion chamber fuel amount, the flue gas flow is obtained. The method of obtaining the flue gas flow of the equal T3 regulation mode is similar to that of the equal T3-equal T4 regulation mode.

[0071] return Figure 1 In step 2 of the embodiment, according to the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system and the change of the flue gas flow rate, the change of the steam production of the supplementary-fired waste heat boiler under different supplementary-fired temperatures is obtained.

[0072] It should be noted that a waste heat boiler, as the name suggests, refers to a boiler that uses the waste heat in waste gas, waste materials or waste liquid in various industrial processes and the heat generated by the combustion of combustible substances to heat water to a certain temperature.

[0073] The model of the supplementary-fired waste heat boiler can be expressed as:

[0074] ;

[0075] ;

[0076] In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

[0077] Based on the flue gas parameters at the HRSG inlet, the steam production of each heat exchange surface in the HRSG is calculated according to the HRSG model and the design curves of steam pressure and temperature of the steam turbine under variable load, and the total steam production of the HRSG can be obtained.

[0078] return Figure 1In step 3 of the embodiment, according to the changes in flue gas flow and steam production, the changes in thermal and electrical loads of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment modes and different supplementary combustion temperatures are obtained.

[0079] The power generation of the gas turbine can be obtained according to the flue gas flow combined with the gas turbine model and the combustion chamber model. The power generation and heating supply of the steam turbine can be obtained according to the steam production combined with the steam turbine model. Based on this, the changes in the variable operating condition heat and electricity load of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment modes and different supplementary combustion temperatures can be obtained.

[0080] return Figure 1 In step 4 of the embodiment, according to the changes in the heat and electricity loads under the variable operating conditions, the thermal and electric operation domain of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment modes and different supplementary combustion temperatures is obtained.

[0081] Specifically, the thermal power operation domain is drawn out according to the different variable operating condition adjustment methods, the thermal and electrical load changes at different supplementary combustion temperatures.

[0082] Thermoelectric operating domain is visible Figure 3 and Figure 4 ,in, Figure 3 The description is for the range of electric load variation under different supplementary combustion temperatures in the same T3 regulation mode, while satisfying the heat load condition, and the area contained in the graph is used as the thermal power operation domain; Figure 4 What is described is the isoT3-isoT4 regulation mode.

[0083] return Figure 1 In step 5 of the embodiment, according to the heat and electricity load requirements on the user side, a preferred operation scheme including a variable operating condition adjustment mode and a supplementary combustion temperature is obtained in the thermal power operation domain, and the gas turbine combined cycle heat and power system is controlled according to the preferred operation scheme.

[0084] It should be noted that the preferred operation plan is: under a certain operation plan, at the same time, the heat and electricity loads generated by the generator set are closest to the heat and electricity load demands of the user.

[0085] The process of determining the optimal operation plan can be:

[0086] 1) Find all operation plans that meet the thermal and electrical load requirements of the user side from the thermal power operation domain; the operation plan is the operation plan of the gas turbine combined cycle cogeneration system;

[0087] 2) Traverse all operation plans. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is selected as the preferred operation plan.

[0088] The conventional operation mode of the combined heat and power unit is "heat determines electricity". In this mode, during certain periods, such as late at night, when the ambient temperature is low, the unit has a large demand for heat supply, but the power grid has a low demand for power generation. However, in order to ensure the unit's heat supply, the unit is forced to increase its power generation, resulting in a decrease in the power grid's renewable energy consumption and a significant wind abandonment phenomenon. Therefore, the optimal operation plan can make the unit match the heat and electricity demand of the user side as much as possible, greatly improve the flexibility of heating, and provide a large amount of renewable energy consumption for the power grid.

[0089] The following is an explanation of the implementation effect of the above method in combination with actual production:

[0090] For example, when providing 150MW of heat load, the minimum power generation of the equal T3 regulation strategy is 270MW, the minimum power generation of the equal T3-T4 regulation strategy is 225MW, the minimum power generation of the equal T3-supplementary combustion regulation strategy is 175MW, and the minimum power generation of the equal T4-supplementary combustion regulation strategy is 150MW; when providing 200MW of heat load, the minimum power generation of the equal T3 regulation strategy is 325MW, the minimum power generation of the equal T3-T4 regulation strategy is 325MW, the minimum power generation of the equal T3-T4-supplementary combustion regulation strategy is 200MW, and the minimum power generation of the equal T3-supplementary combustion regulation strategy is 170MW. Therefore, it can be seen that based on the above method, after adopting the supplementary combustion waste heat boiler, the heating capacity of the gas turbine combined cycle heat and power system is greatly improved in the low load area of ​​the gas turbine.

[0091] When the heat supply is 0-100MW, the system power generation is the lowest under the T3 regulation strategy operation mode; when the heat supply is 100-120MW, the system power generation is the lowest under the T3-T4 regulation strategy operation mode; when the heat supply is 120-190MW, the system power generation is the lowest under the T3-T4-supplementary combustion regulation strategy operation mode; when the heat supply is 190-250MW, the system power generation is the lowest under the T3-supplementary combustion regulation strategy operation mode. Therefore, it can be seen that based on the above method, in different heating load ranges, different operation strategies can significantly reduce the power generation of the gas turbine combined cycle heat and power system and improve the unit's renewable energy consumption capacity.

[0092] The above method is based on the full-operating condition model of the gas turbine combined cycle cogeneration system and the supplementary combustion waste heat boiler model, and obtains the thermal power operation domain of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment methods and different supplementary combustion temperatures. According to the heat and electricity load requirements on the user side, the preferred operation scheme including the variable operating condition adjustment method and the supplementary combustion temperature is determined in the thermal power operation domain, that is, the operation scheme combining the appropriate supplementary combustion temperature with the variable operating condition adjustment method is matched according to the load demand. The gas turbine combined cycle cogeneration system is controlled according to the preferred operation scheme, which can greatly improve the heating flexibility of the gas turbine combined cycle system. Under the coordinated operation of the supplementary combustion waste heat boiler and the variable operating condition flexible adjustment strategy, when the heating demand is met, the power generation load of the gas turbine combined cycle cogeneration system is greatly reduced, and the renewable energy consumption space for the unit is increased.

[0093] Figure 5 This is a schematic diagram of an embodiment of a gas turbine combined cycle cogeneration device disclosed in the present invention. Figure 5 The embodiment is a virtual device that can be loaded and executed by a control server of a gas turbine combined cycle cogeneration system, including a flue gas flow module, a steam production module, a load module, a thermal power operation domain module and an optimization control module.

[0094] The flue gas flow module of the embodiment is configured to obtain the flue gas flow variation of the gas turbine in different variable operating condition adjustment modes under different electrical loads according to the full operating condition model of the gas turbine combined cycle cogeneration system.

[0095] It should be noted that in the flue gas flow module, the full operating condition model of the gas turbine combined cycle cogeneration system mainly includes the combustion chamber model and the gas turbine model.

[0096] The combustion chamber model can be expressed as:

[0097] ;

[0098] In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber and LHV is the lower heating value.

[0099] The gas turbine model can be expressed as:

[0100] ;

[0101] Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

[0102] The steam production module of the embodiment is configured to obtain the change of steam production of the supplementary burning waste heat boiler at different supplementary burning temperatures according to the model of the supplementary burning waste heat boiler in the gas turbine combined cycle cogeneration system and the change of flue gas flow.

[0103] It should be noted that in the steam production module, the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system can be expressed as:

[0104] ;

[0105] ;

[0106] In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

[0107] The load module of the embodiment is configured to obtain the changes in the variable operating condition heat and electric loads of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment modes and different supplementary combustion temperatures according to the changes in the flue gas flow rate and the steam production.

[0108] The thermal power operation domain module of the embodiment is configured to obtain the thermal power operation domain of the gas turbine combined cycle heat and power cogeneration system under different variable operating condition adjustment modes and different supplementary combustion temperatures according to changes in thermal and electrical loads under variable operating conditions.

[0109] The optimal control module of the embodiment is configured to obtain a preferred operating scheme including a variable operating condition adjustment mode and a supplementary combustion temperature in the thermal power operation domain according to the thermal and electrical load demands on the user side, and to control the gas turbine combined cycle cogeneration system according to the preferred operating scheme.

[0110] It should be noted that the preferred operation plan is: under a certain operation plan, at the same time, the heat and electricity loads generated by the generator set are closest to the heat and electricity load demands of the user.

[0111] The process of determining the optimal operation plan can be:

[0112] 1) Find all operation plans that meet the thermal and electrical load requirements of the user side from the thermal power operation domain; among them, the operation plan is the operation plan of the gas turbine combined cycle cogeneration system.

[0113] 2) Traverse all operation plans. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is selected as the preferred operation plan.

[0114] Similar to the above method, this device is based on the full-operating condition model of the gas turbine combined cycle cogeneration system and the supplementary combustion waste heat boiler model, and obtains the thermal power operation domain of the gas turbine combined cycle cogeneration system under different variable operating condition adjustment methods and different supplementary combustion temperatures. According to the user-side heat and electricity load requirements, the preferred operation scheme including the variable operating condition adjustment method and the supplementary combustion temperature is determined in the thermal power operation domain, that is, the operation scheme combining the appropriate supplementary combustion temperature with the variable operating condition adjustment method is matched according to the load demand. The gas turbine combined cycle cogeneration system is controlled according to the preferred operation scheme, which can greatly improve the heating flexibility of the gas turbine combined cycle system. Under the coordinated operation of the supplementary combustion waste heat boiler and the variable operating condition flexible adjustment strategy, when the heating demand is met, the power generation load of the gas turbine combined cycle cogeneration system is greatly reduced, and the renewable energy consumption space for the unit is increased.

[0115] Based on the same technical solution, the present disclosure also relates to a computer-readable storage medium, which stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes a control method for a gas turbine combined cycle cogeneration system.

[0116] Based on the same technical solution, the present disclosure also relates to a computer device, including one or more processors and one or more memories, one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a control method for a gas turbine combined cycle cogeneration system.

[0117] It will be appreciated by those skilled in the art 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. Furthermore, 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A control method for a gas turbine combined cycle cogeneration system, characterized in that: include: According to the full operating model of the gas turbine combined cycle cogeneration system, the flue gas flow rate changes of the gas turbine under different electrical loads and different operating conditions are obtained; According to the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system and the change of flue gas flow, the change of steam production of the supplementary-fired waste heat boiler under different supplementary-fired temperatures is obtained; According to the changes in flue gas flow and steam production, the changes in heat and electricity loads of the gas turbine combined cycle cogeneration system under different variable operating conditions and different supplementary combustion temperatures are obtained; According to the changes in heat and electricity loads under variable operating conditions, the thermal and electric operation domain of the gas turbine combined cycle heat and power system under different variable operating condition adjustment modes and different supplementary combustion temperatures is obtained; According to the heat and electricity load demands on the user side, an optimal operation scheme including variable operating condition adjustment mode and supplementary combustion temperature is obtained in the thermal power operation domain, and the gas turbine combined cycle heat and power system is controlled according to the optimal operation scheme.

2. The method according to claim 1, characterized in that The full-operating model of the gas turbine combined cycle cogeneration system includes the combustion chamber model and the gas turbine model; The combustion chamber model is: ； In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber, LHV is the lower heating value; The gas turbine model is: ； Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

3. The method according to claim 1, characterized in that The model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system is: ； ； In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

4. The method according to claim 1, characterized in that According to the heat and electricity load requirements on the user side, the optimal operation scheme including variable operating condition adjustment mode and supplementary combustion temperature is obtained in the thermal power operation domain, including: Find all operation plans that meet the heat and electricity load requirements of the user side from the thermal power operation domain; among which, the operation plan is the operation plan of the gas turbine combined cycle cogeneration system; All operation plans are traversed. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is taken as the preferred operation plan.

5. A control device for a gas turbine combined cycle cogeneration system, characterized in that: include: The flue gas flow module obtains the flue gas flow changes of the gas turbine under different electrical loads and different variable operating conditions according to the full operating condition model of the gas turbine combined cycle heat and power system; The steam production module obtains the change of steam production of the supplementary-fired waste heat boiler under different supplementary-fired temperatures according to the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system and the change of flue gas flow rate; The load module obtains the changes in thermal and electrical loads of the gas turbine combined cycle cogeneration system under different variable operating conditions and different supplementary combustion temperatures according to the changes in flue gas flow and steam production; The thermal power operation domain module obtains the thermal power operation domain of the gas turbine combined cycle heat and power system under different variable operating condition adjustment modes and different supplementary combustion temperatures according to the changes in thermal and electrical loads under variable operating conditions; The optimal control module obtains the optimal operation scheme including the variable operating condition adjustment mode and the supplementary combustion temperature in the thermal power operation domain according to the heat and electricity load demand on the user side, and controls the gas turbine combined cycle heat and power system according to the optimal operation scheme.

6. The device according to claim 5, characterized in that In the flue gas flow module, the full operating model of the gas turbine combined cycle cogeneration system includes the combustion chamber model and the gas turbine model; The combustion chamber model is: ； In the formula, β is the excess air coefficient, L is the theoretical air volume, are the flue gas enthalpy values ​​at the combustion chamber outlet and the compressor inlet, respectively. are the fuel enthalpy at the compressor outlet and compressor inlet, respectively, are the air enthalpy values ​​at the compressor outlet and compressor inlet, respectively. is the efficiency of the combustion chamber, LHV is the lower heating value; The gas turbine model is: ； Where k is a constant, A is the turbine inlet area, m is the flue gas flow rate at the gas turbine inlet, T is the flue gas temperature at the gas turbine inlet, p is the flue gas pressure at the gas turbine inlet, and const is a constant.

7. The device according to claim 5, characterized in that In the steam production module, the model of the supplementary-fired waste heat boiler in the gas turbine combined cycle cogeneration system is: ； ； In the formula, m g is the flue gas flow rate, m s is the steam flow rate, c p is the specific heat capacity, ΔT is the logarithmic heat transfer temperature difference, (UA) p is the overall heat transfer coefficient of the heat surface, T g1 is the inlet flue gas temperature of the supplementary-fired waste heat boiler, T g2 is the flue gas temperature at the outlet of the supplementary-fired waste heat boiler, h s1 is the inlet enthalpy of steam / water, h s2 is the outlet enthalpy of steam / water, T s1 is the steam / water inlet temperature, T s2 is the steam / water outlet temperature.

8. The device according to claim 5, characterized in that In the optimal control module, according to the heat and electricity load requirements on the user side, the optimal operation scheme including the variable operating condition adjustment mode and the supplementary combustion temperature is obtained in the thermal power operation domain, including: Find all operation plans that meet the heat and electricity load requirements of the user side from the thermal power operation domain; among which, the operation plan is the operation plan of the gas turbine combined cycle cogeneration system; All operation plans are traversed. If the electric load corresponding to the operation plan is closest to the electric load demand, and the heat load corresponding to the operation plan is closest to the heat load demand, then the operation plan is taken as the preferred operation plan.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes any one of the methods of claims 1 to 4.

10. A computer device, characterized in that: include: One or more processors and one or more memories, one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the methods described in claims 1 to 4.

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