Method and apparatus for adjusting gas turbine purge time

Abstract

This invention discloses a method and apparatus for adjusting the purging time of a gas turbine. The method includes: determining a maximum purging shortening time for the gas turbine based on the current purging time and the airflow rate during purging; and adjusting the purging time of the gas turbine based on the maximum purging shortening time. This invention solves the technical problem of resource waste caused by inaccurate purging time calculation.

Description

Technical Field

[0001] This invention relates to the field of gas turbines, and more specifically, to a method and apparatus for adjusting the purge time of a gas turbine. Background Technology

[0002] The fuel used in combined cycle power plants can cause fires or explosions in the gas turbines. One cause of a fire or explosion is the accumulation of combustible gases or liquids in the gas turbine system during shutdown or after a failed start-up, which then ignites during unit startup.

[0003] The purpose of gas turbine purging is to replace residual combustible gases with air purging equipment before startup, which is a safety measure. Currently, most heavy-duty gas turbines still use purging procedures during startup to prevent deflagration of flammable materials accumulated in the gas turbine or waste heat boiler.

[0004] However, gas turbine cleaning will have the following impacts on the unit's energy efficiency:

[0005] (1) Gas turbine manufacturers typically set the purging time for domestic heavy-duty gas turbines to be 8 to 18 minutes. Purging prolongs the gas turbine start-up time and reduces power generation.

[0006] (2) The cleaning process consumes a lot of electricity, fuel and water.

[0007] (3) For warm or hot start-up, purging involves blowing cold air into the waste heat boiler to reduce the steam temperature and pressure within the boiler's heating surfaces. When the temperature of the blown-in air is lower than the saturation temperature of the steam within the boiler's heating surfaces, the steam will condense into liquid, increasing the amount of condensate during unit startup. Excessive condensate can lead to problems such as blockage of steam flow pipes, thermal deformation, and impact, while also shortening the fatigue life of the waste heat boiler's superheater, steam drum downcomer, and steam outlet. Taking a certain F-class gas turbine as an example, after 12 minutes of purging, the superheater and reheater of the waste heat boiler decreased by 48°C and 113°C, respectively, compared to before purging.

[0008] (4) It prolongs the unit's response time to the power grid and reduces the response speed.

[0009] There is currently no effective solution to the above problems. Summary of the Invention

[0010] This invention provides a method and apparatus for adjusting the purging time of a gas turbine, so as to at least solve the technical problem of resource waste caused by inaccurate calculation of purging time.

[0011] According to one aspect of the present invention, a method for adjusting the purge time of a gas turbine is provided, comprising: adjusting the purge time t of the gas turbine as currently being performed.e and the air flow rate during the purge of the gas turbine Determine the maximum purge shortening time of the gas turbine; adjust the purge time of the gas turbine based on the maximum purge shortening time.

[0012] According to another aspect of the present invention, an apparatus for adjusting the purging time of a gas turbine is also provided, comprising: a time determination module configured to adjust the purging time t currently being performed by the gas turbine. e and the air flow rate during the purge of the gas turbine The maximum purge shortening time of the gas turbine is determined; the adjustment module is configured to adjust the purge time of the gas turbine based on the maximum purge shortening time.

[0013] According to another aspect of the present invention, a gas turbine is also provided, including the means for adjusting the gas turbine purge time as described above.

[0014] According to another aspect of the present invention, a computer-readable storage medium is also provided, on which a program is stored, which, when executed, causes a computer to perform the method of adjusting the gas turbine purge time as described above.

[0015] In this embodiment of the invention, the maximum purging shortening time of the gas turbine is determined based on the current purging time and the air flow rate during purging. The purging time of the gas turbine is then adjusted based on the maximum purging shortening time, thus solving the technical problem of resource waste caused by inaccurate purging time calculation in related technologies. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a flowchart of a method for adjusting the purge time of a gas turbine according to an embodiment of the present invention;

[0018] Figure 2 This is a flowchart of another method for adjusting the purge time of a gas turbine according to an embodiment of the present invention;

[0019] Figure 3 This is a flowchart of another method for adjusting the purge time of a gas turbine according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a device for adjusting the purge time of a gas turbine according to an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] Example 1

[0024] According to an embodiment of the present invention, a method for adjusting the purge time of a gas turbine is provided, such as... Figure 1 As shown, the method includes:

[0025] Step S102, based on the current purge time t of the gas turbine e The maximum shortening time for the gas turbine is determined by the airflow rate during the purging of the gas turbine.

[0026] First, determine the purge volume V of the gas turbine, and calculate the minimum total purge flow rate Q based on the determined purge volume V. t，min Based on the air mass flow rate of the gas turbine at full load. Given the density ρ of the purge air, calculate the minimum purge flow rate required for the purge of the gas turbine.

[0027] Next, based on the operating parameters of the gas turbine, the airflow rate during the gas turbine purge is calculated.

[0028] For example, based on the gas turbine's cleaning speed and design speed, the turbine inlet air pressure, compressor exhaust temperature, turbine outlet air pressure, and cleaning air density at the cleaning speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the gas turbine's fuel mass flow rate and air mass flow rate under design load, the air flow rate during gas turbine cleaning can be calculated. or

[0029] Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0030] Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0031] Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0032] Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0033] Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0034] Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. or

[0035] Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge.

[0036] Next, based on the airflow rate Calculate the total purging flow rate Q under the purging program currently being executed by the gas turbine. t，e .

[0037] Finally, based on the current purge time t of the gas turbine... e and the air flow rate during the purge of the gas turbine Determine the maximum purging shortening time for the gas turbine. For example, the airflow rate during gas turbine purging. When the value is greater than or equal to a preset value, the maximum purging time of the gas turbine is reduced to the purging time t currently being performed by the gas turbine. e The difference from the preset time value; the airflow rate during the gas turbine purging. If the value is less than the preset value, the purge time t currently being performed by the gas turbine will be used as the basis for the calculation. e The minimum total blowing flow rate Q t，min and the airflow rate during the purge of the gas turbine. The maximum purge shortening time of the gas turbine is determined. The preset value is determined based on the determined purge volume V.

[0038] Step S104: Adjust the purge time of the gas turbine based on the maximum purge shortening time.

[0039] In one example, the purge speed of the gas turbine can be kept constant, and the purge time of the gas turbine can be shortened based on the maximum purge reduction time.

[0040] In another example, the purge speed of the gas turbine can be adjusted, and the purge time of the gas turbine can be shortened based on the maximum purge reduction time. For example, if the gas turbine purge speed setpoint is greater than a preset speed threshold, the gas turbine purge speed is reduced, and the purge time of the gas turbine is shortened based on the maximum purge reduction time. If the gas turbine purge speed setpoint is less than the preset speed threshold, the gas turbine purge speed is increased, and the purge time of the gas turbine is shortened based on the maximum purge reduction time.

[0041] In existing technologies, gas turbine power plants typically adjust purging time by testing and measuring the content of specific gases in the flue and chimney. However, because the flow field in the flue and waste heat boiler is not uniform, the absence of specific gases at the measuring point does not guarantee the absence of specific gases elsewhere. Furthermore, this method requires start-up and shutdown, resulting in significant energy consumption. The purging time adjustment method provided in this embodiment not only meets the safety requirements of gas turbines but also reduces the adverse effects of purging.

[0042] Example 2

[0043] According to an embodiment of the present invention, another method for adjusting the purge time of a gas turbine is provided.

[0044] Current regulations and standards for gas turbine purging fall into two categories. One category is based on the National Fire Protection Association's (NFPA) Hazard Classification Standard for Boilers and Combustion Systems (NFPA 85), which specifies requirements for purging air flow rate, duration, and volume. The other category includes relevant standards such as ISO 21789 issued by the International Organization for Standardization (ISO) and GB / T 32821 issued in China, which specify requirements for purging air flow rate and volume. This latter category primarily focuses on the ISO series published by the International Organization for Standardization. GB / T 32821 was developed with reference to ISO 21789, and the purging requirements are the same in both standards.

[0045] The requirements for gas turbine cleaning in Category 1 of the "Hazard Classification Standard for Boilers and Combustion Systems" (NFPA 85-2019) are as follows: (1) The total cleaning air flow rate shall be greater than or equal to 5 times the cleaning volume; (2) The cleaning volume shall be the volume from the gas turbine inlet to the point where the flue gas temperature is 56°C lower than the minimum auto-ignition temperature of the fuel, and the cleaning volume shall not be less than the volume from the gas turbine outlet to the outlet of the first-stage evaporator of the waste heat boiler; (3) The cleaning time shall not be less than 5 minutes; (4) The cleaning flow rate shall not be less than 8% of the air mass flow rate at full load.

[0046] The second category of "Gas Turbine Applications - Safety" (GB / T 32821) and other standards have the following requirements for gas turbine purging: (1) The total purging air flow rate shall be greater than or equal to 3 times the purging volume; (2) GB / T 32821 indicates that the purging volume shall be calculated to the bottom of the chimney, or at any load where the exhaust temperature of the flammable gas or vapor is below 80% of the auto-ignition temperature; if it is a mixture, the auto-ignition temperature of the fuel shall be the auto-ignition temperature of the component with the lowest auto-ignition temperature and a concentration exceeding 3% (by volume); (3) The temperature of the gas used for purging shall be lower than 80% of the auto-ignition temperature of the component containing the flammable gas or vapor.

[0047] The two standards above are compared using natural gas as the fuel. Natural gas's main component is methane, and it also contains ethane, propane, isobutane, n-butane, isopentane, n-pentane, and others. etc., generally The volume content of these components is extremely low and can be ignored. The auto-ignition temperatures of these components are shown in Table 1, therefore the minimum auto-ignition temperature of natural gas is 260℃. The NFPA 85 requirement of 56℃ below the minimum auto-ignition temperature of the fuel is located near the low-pressure evaporator of the waste heat boiler, approximately at 1 / 2 to 2 / 3 of the furnace volume. Since the volume of the gas turbine is very small compared to the horizontal flue at the gas turbine outlet and the waste heat boiler, it can be ignored; only the volume of the horizontal flue and waste heat boiler is considered. The volume is calculated as the sum of the horizontal flue volume (5 times the total blowdown flow rate) and the waste heat boiler volume (5 / 2 to 10 / 3).

[0048]

[0049] Table 1

[0050] According to GB / T 32821, if the purging volume is taken as the portion extending to the bottom of the chimney, including the gas turbine, horizontal flue, and up to the waste heat boiler chimney inlet, then the total purging flow rate is the sum of three times the horizontal flue volume and three times the waste heat boiler volume. Although the length of the horizontal flue varies, its volume is much smaller than that of the waste heat boiler. If only the waste heat boiler volume is considered, the total purging flow rate required by NFPA 85 is roughly the same as that of GB / T 32821. Furthermore, NFPA 85 specifies requirements for purging time and flow rate; overall, NFPA 85 is stricter than GB / T 32821.

[0051] Large gas turbine manufacturers often use NFPA 85 to design gas turbine cleaning systems. However, NFPA 85 has stricter requirements for cleaning than GB / T 32821. Therefore, the adjustment method in this embodiment is based on meeting the requirements of NFPA 85, and also refers to the provisions of ISO 21789.

[0052] like Figure 2 As shown, the method for adjusting the gas turbine purge time provided in this embodiment includes the following steps:

[0053] Step S202: Determine the cleaning volume.

[0054] Taking natural gas as an example, the composition of natural gas is not constant, so the minimum auto-ignition temperature of the fuel may change, and therefore the purging volume required by NFPA 85 may also change. For safety and simplicity, the volume from the horizontal flue inlet to the waste heat boiler chimney inlet is used as the purging volume, and this volume is larger than the purging volume required by NFPA 85. Therefore, the minimum total purging flow rate is...

[0055] Q t，min =5V (1)

[0056] Among them, Q t，min This indicates the minimum total purge flow rate required for gas turbine purge, expressed in m³ / s. 3 V represents the gas turbine purge volume, in m³. 3 .

[0057] Step S204: Calculate the minimum required purge flow rate.

[0058] If the minimum purge volume flow rate is greater than or equal to 8% of the full-load air volume flow rate, then

[0059]

[0060] in, This indicates the minimum required purge flow rate for gas turbine cleaning, expressed in m³ / s. 3 / s; ρ represents the mass flow rate of the gas turbine at full load (design load), in kg / s; ρ represents the density of the purge air, in kg / m³. 3 .

[0061] Step S206: Calculate the current cleaning flow rate and total cleaning flow rate of the gas turbine.

[0062] Gas turbines generally do not have air and flue gas flow measurement points, so the flow rate needs to be calculated. The purge flow rate of a gas turbine can be obtained from equation (3).

[0063]

[0064] in, Airflow rate during gas turbine purging, in meters per second (m³). 3 / s; Since there is no fuel combustion in the gas turbine during purging, the purging airflow is equal to the turbine flue gas flow. n and n0 are the gas turbine purging speed and design speed, respectively, in rpm; p3, p 30 These are the turbine inlet flue gas pressures at the purge speed and design speed, respectively, in MPa; p3 can be replaced by the compressor exhaust pressure. p4, p 40 These are the turbine outlet flue gas pressures, in MPa, at the purge speed and design speed, respectively; T3, T 30 These are the turbine inlet flue gas temperatures at the purge speed and the design speed, respectively, in K. This represents the fuel mass flow rate of the gas turbine under design load, expressed in kg / s.

[0065] Because the T3 temperature is very high during gas turbine operation, directly measuring T3 with a thermocouple would easily burn out the thermocouple, so there is no T3 temperature measuring point. Since there is no fuel combustion, the turbine inlet flue gas temperature during the purge phase can be replaced by the compressor exhaust temperature.

[0066] The total cleaning flow rate Q under the current cleaning program executed by the gas turbine can also be obtained. t，e for

[0067]

[0068] In the formula, t e This represents the current purging time of the gas turbine, in minutes.

[0069] Step S208: Adjust the blowing time.

[0070] When t e If the time exceeds 5 minutes, adjustments can be made to shorten the cleaning time. This embodiment provides three methods for adjusting the cleaning time.

[0071] The first method involves shortening the cleaning time while maintaining the original gas turbine cleaning speed. In this case,

[0072]

[0073] The second method involves first reducing the gas turbine cleaning speed and then shortening the cleaning time. Since the original gas turbine cleaning speed setting is relatively high compared to the cleaning volume, to reduce energy consumption, the gas turbine cleaning speed is set to a lower speed (requiring...). Then adjust the blowing time.

[0074] The third method involves first increasing the gas turbine cleaning speed and then shortening the cleaning time. This is generally used when the cleaning volume is large and the original gas turbine cleaning speed setting is relatively low. To shorten the cleaning time, the cleaning speed is increased.

[0075] The maximum time reduction achieved by these three methods is:

[0076]

[0077] In the formula, Δt max This indicates the maximum shortenable purging time, in minutes; the time can be adjusted from 0 to Δt based on actual conditions. max The purge time is shortened within the specified range. In this embodiment, the purge time t currently performed by the gas turbine is used to shorten the purge time. e and the air flow rate during the purge of the gas turbine This method determines the maximum purging time of the gas turbine, thereby solving the problem that gas turbine power plants adjust the purging time by testing and measuring the specific gas content in the flow channel and chimney. However, due to the uneven flow field in the flue and waste heat boiler, even if there is no specific gas at the measuring point, it cannot be guaranteed that there is no specific gas elsewhere, resulting in inaccurate purging time. It also solves the problem of the need for start-up and shutdown and high energy consumption in the existing technology.

[0078] Example 3

[0079] According to embodiments of the present invention, yet another method for adjusting the purge time of a gas turbine is provided. For example... Figure 3 As shown, the method includes the following steps:

[0080] Step S302: Obtain the parameter data of the gas turbine.

[0081] For example, a 9171E gas turbine in a power plant is equipped with a three-pressure, non-supplementary combustion, vertical waste heat boiler. It operates at full load for extended periods, using natural gas as fuel, and operates on a day-on, night-off basis, with over 250 start-ups and shutdowns per year, mostly during hot starts. The gas turbine manufacturer has set a purging time of 15 minutes and a purging speed of 25% of the design speed (3000 rpm).

[0082] Step S304: Calculate the relevant data for the purge of the gas turbine.

[0083] Using the same formula as in Example 2, the volume of the horizontal flue was calculated to be 208 m³. 3 The net volume of the waste heat boiler furnace is 2858m³. 3 The volume of the clear air is 3066m³. 3 So, what is the minimum total purge flow rate Q? min 15330m 3 Given that the air and fuel mass flow rates under the design operating conditions of the gas turbine are 405 kg / s and 5 kg / s respectively, and the air density ρ is taken as 1.22 kg / m³ (15℃, one atmosphere), then the minimum required purge flow rate is... It is 25.43 m3 / s.

[0084] Step S306: Calculate the maximum cleaning shortening time.

[0085] The calculated data for gas turbine cleaning are shown in Table 2. The current cleaning flow rate of the gas turbine is 33.26 m³ / s. Using the same calculation method as formula (5) in Example 2, the maximum cleaning reduction time (also known as the maximum shortenable time) can be calculated to be 7.3 min.

[0086]

[0087] Table 2

[0088] Step S308: Adjust the blowing time.

[0089] For example, the blowing time can be adjusted from 15 minutes to 8 minutes.

[0090] By simulating ignition and causing the gas turbine to fail, the turbine speed was adjusted to 25% of the design speed for purging. Natural gas concentration was then measured at the waste heat boiler superheater and chimney. Natural gas was detected in the superheater and chimney 1 minute and 3 minutes after the ignition failure, respectively, with the duration of detected gas being less than 1 minute. The test results demonstrate that a purging time of 8 minutes meets safety requirements.

[0091] Using the above method, based on 250 gas turbine starts per year, shortening the purging time can increase power generation by 5.25 million kWh and reduce power consumption during start-up by 37,500 kWh. Assuming an electricity price of 0.7 yuan / kWh and a natural gas price of 2.5 yuan / m³, and assuming 1 m³ of natural gas generates 5 kWh of electricity, the annual gross profit could increase by 1.08 million yuan.

[0092] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0093] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0094] Example 4

[0095] According to an embodiment of the present invention, a device for adjusting the purge time of a gas turbine is provided, such as... Figure 4 As shown, the device includes a time determination module 42 and an adjustment module 44.

[0096] The time determination module 42 is configured to determine the time based on the current purge time t of the gas turbine. e and the air flow rate during the purge of the gas turbine Determine the maximum purge reduction time for the gas turbine;

[0097] The adjustment module 44 is configured to adjust the purge time of the gas turbine based on the maximum purge shortening time.

[0098] Optionally, specific examples in this embodiment can refer to the examples described in embodiments 1 to 3 above, and will not be repeated here.

[0099] This embodiment reduces the cleaning time by calculating the cleaning time and adjusting the rotation speed, thereby achieving the beneficial effect of saving energy.

[0100] Example 5

[0101] According to an embodiment of the present invention, a gas turbine is provided, including the device for adjusting the gas turbine purge time as described in embodiment 4, thereby enabling automatic adjustment of the purge time.

[0102] Optionally, specific examples in this embodiment can refer to the examples described in embodiments 1 to 3 above, and will not be repeated here.

[0103] Example 6

[0104] Embodiments of the present invention also provide a storage medium. The storage medium is configured to store program code for executing embodiments 1 to 3.

[0105] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0106] Optionally, specific examples in this embodiment can refer to the examples described in embodiments 1 to 3 above, and will not be repeated here.

[0107] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0108] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0109] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0110] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for adjusting the purge time of a gas turbine, characterized in that, include: Based on the current purge time of the gas turbine and the air flow rate during the purge of the gas turbine Determine the maximum purge reduction time for the gas turbine; The purging time of the gas turbine is adjusted based on the maximum purging reduction time. The method further includes, prior to determining the maximum purge reduction time of the gas turbine: Determine the purge volume of the gas turbine. Based on the determined blowing volume Calculate the minimum total purge flow rate ; Based on the air mass flow rate of the gas turbine at full load and the density of fresh air Calculate the minimum cleaning flow rate required for cleaning the gas turbine; Based on the operating parameters of the gas turbine, calculate the air flow rate during the gas turbine purge. And based on the airflow Calculate the total purging flow rate under the purging program currently being executed by the gas turbine. ; Among them, based on the current purge time of the gas turbine. and the air flow rate during the purge of the gas turbine Determining the maximum purge reduction time of the gas turbine includes: Airflow rate during gas turbine purging When the value is greater than or equal to a preset value, the maximum purging time of the gas turbine is reduced to the purging time currently being performed by the gas turbine. The difference from the preset time value; Airflow rate during gas turbine purging If the time is less than the preset value, based on the current purge time of the gas turbine. The minimum total blowing flow rate and the airflow rate during the purge of the gas turbine. The maximum purge reduction time of the gas turbine is determined.

2. The method according to claim 1, characterized in that, Based on the operating parameters of the gas turbine, calculate the air flow rate during the gas turbine purge. ,include: Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the turbine inlet air pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, compressor exhaust temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the turbine inlet flue gas pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. ;or Based on the gas turbine purge speed and design speed, the compressor exhaust pressure, turbine inlet air temperature, turbine outlet air pressure, and purge air density at the purge speed, the compressor exhaust pressure, turbine inlet flue gas temperature, and turbine outlet flue gas pressure at the design speed, and the fuel mass flow rate and air mass flow rate of the gas turbine under design load, calculate the air flow rate during gas turbine purge. .

3. The method according to claim 1, characterized in that, The preset value is based on the determined blowing volume. And it is certain.

4. The method according to claim 1, characterized in that, Adjusting the purge time of the gas turbine based on the maximum purge reduction time includes: Keeping the purge speed of the gas turbine constant, and shortening the purge time of the gas turbine based on the maximum purge reduction time; or Adjust the purge speed of the gas turbine and shorten the purge time of the gas turbine based on the maximum purge reduction time.

5. The method according to claim 4, characterized in that, Adjusting the purge speed of the gas turbine and shortening the purge time of the gas turbine based on the maximum purge reduction time includes: If the setpoint for the gas turbine cleaning speed is greater than a preset speed threshold, the cleaning speed of the gas turbine is reduced, and the cleaning time of the gas turbine is shortened based on the maximum cleaning reduction time; or If the set value of the gas turbine cleaning speed is less than the preset speed threshold, the cleaning speed of the gas turbine is increased, and the cleaning time of the gas turbine is shortened based on the maximum cleaning shortening time.

6. A device for adjusting the purge time of a gas turbine, characterized in that, include: The timing determination module is configured to determine the time based on the current purge time of the gas turbine. and the air flow rate during the purge of the gas turbine Determine the maximum purge reduction time for the gas turbine; The adjustment module is configured to adjust the purging time of the gas turbine based on the maximum purging shortening time; The device is further configured to: Determine the purge volume of the gas turbine. Based on the determined blowing volume Calculate the minimum total purge flow rate ; Based on the air mass flow rate of the gas turbine at full load and the density of fresh air Calculate the minimum cleaning flow rate required for cleaning the gas turbine; Based on the operating parameters of the gas turbine, calculate the air flow rate during the gas turbine purge. And based on the airflow Calculate the total purging flow rate under the purging program currently being executed by the gas turbine. ; The time determination module is further configured as follows: Airflow rate during gas turbine purging When the value is greater than or equal to a preset value, the maximum purging time of the gas turbine is reduced to the purging time currently being performed by the gas turbine. The difference from the preset time value; Airflow rate during gas turbine purging If the time is less than the preset value, based on the current purge time of the gas turbine. The minimum total blowing flow rate and the airflow rate during the purge of the gas turbine. The maximum purge reduction time of the gas turbine is determined.

7. A gas turbine, characterized in that, Includes the apparatus for adjusting the gas turbine purge time as described in claim 6.

8. A computer-readable storage medium having a program stored thereon, characterized in that, When the program is executed, the computer performs the method as claimed in any one of claims 1 to 5.

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