A method for testing the performance of a marine gas turbine based on a test map

Abstract

The application discloses a marine gas turbine performance test method based on a test map, and relates to the field of marine gas turbines. In the control process, when the target power percentage of the next steady state working condition is less than 1, the measured output power can reach the required power, so the marine gas turbine is directly controlled according to the measured output power to rise or drop the working condition, and when the target power percentage of the next steady state working condition is 1, the influence of the ambient temperature is considered, the measured output power can not reach the rated output power, so the marine gas turbine is controlled to rise the working condition by comprehensively considering the measured output power, the low-pressure compressor rotating speed, the high-pressure compressor rotating speed and the low-pressure turbine rear gas temperature. According to the characteristics of different test stages, different parameters are taken as the control basis, the marine gas turbine can be accurately tested according to the test map without over-temperature and over-speed, and the test accuracy, reliability and operability are higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of marine gas turbine, in particular to a marine gas turbine performance test method based on test map. BACKGROUND

[0002] Marine gas turbine is a kind of high-speed rotating power equipment, compared with marine diesel engine or steam turbine unit, marine gas turbine has the advantages of saving engine room area, starting fast, etc., and is widely used in ship power and ship power generation.

[0003] As the main power of the ship, the operation reliability of marine gas turbine is very important, so the marine gas turbine needs to be tested before leaving the factory. When the performance of the marine gas turbine is tested, the measured output power of the marine gas turbine is generally controlled to control the marine gas turbine to change with time according to the required working condition of the test map, so as to carry out the predetermined scheme, such as increasing the working condition, decreasing the working condition, and running at a plurality of representative working conditions for a specified time, so as to evaluate the performance of the marine gas turbine, and determine whether the operation reliability meets the factory requirements. For example, as shown in the test map Figure 1 , first control the measured output power of the marine gas turbine to start increasing from 0, until it reaches 0.4W0, and then stably run at 0.4 working condition with power percentage of 0.4 for 1.5h, then control the measured output power of the marine gas turbine to decrease to 0.2W0, and then stably run at 0.2 working condition with power percentage of 0.2 for 1h, and so on, W0 is the rated output power of the marine gas turbine. However, in the actual test process, the output power of the marine gas turbine is affected by the atmospheric temperature, the measured output power of the marine gas turbine will exist deviation and lag, and will also be affected by the actual operation of the operator, so that the measured output power cannot accurately represent the actual working condition of the marine gas turbine, thereby causing the test process to be inconsistent with the requirements of the test map, and affecting the reliability of the test result. SUMMARY

[0004] In view of the above problems and technical needs, the present application proposes a marine gas turbine performance test method based on test map, and the technical scheme of the present application is as follows:

[0005] A marine gas turbine performance test method based on test map, the steady state test stage of the test map includes a plurality of continuous steady state working conditions, and the steady state test time of each steady state working condition reaches the minimum steady state time, the marine gas turbine performance test method comprises:

[0006] According to the test map, the next steady state working condition of the current working condition of the marine gas turbine is determined as the target steady state working condition, and the target power percentage corresponding to the target steady state working condition is determined .

[0007] when the target power percentage , after ending the current operating mode, the marine gas turbine is controlled to increase or decrease operating mode according to the measured output power of the hydraulic dynamometer of the marine gas turbine until it is switched to the target steady-state operating mode and continuously operates according to the target steady-state operating mode;

[0008] when the target power percentage , after ending the current operating mode, the marine gas turbine is controlled to increase or decrease operating mode according to the measured output power of the hydraulic dynamometer of the marine gas turbine , the low-pressure compressor speed , the high-pressure compressor speed , the low-pressure turbine rear gas temperature until it is switched to the target steady-state operating mode and continuously operates according to the target steady-state operating mode.

[0009] Further, the technical solutions of the application are as follows:

[0010] when the target power percentage , the marine gas turbine is controlled to increase or decrease operating mode until the measured output power of the hydraulic dynamometer of the marine gas turbine reaches , it is determined that the target steady-state operating mode has been switched to and continuously operates according to the target steady-state operating mode, is the rated output power of the marine gas turbine;

[0011] when the target power percentage , the marine gas turbine is controlled to increase operating mode until the measured output power of the hydraulic dynamometer of the marine gas turbine , the low-pressure compressor speed , the high-pressure compressor speed , the low-pressure turbine rear gas temperature , it is determined that the target steady-state operating mode has been switched to and continuously operates according to the target steady-state operating mode.

[0012] Further, the technical solutions of the application are as follows: the corresponding rated target value of the measured output power is the rated output power of the marine gas turbine , the corresponding rated target value of the low-pressure compressor speed is the low-pressure factory rated equivalent speed , the corresponding rated target value of the high-pressure compressor speed is the high-pressure factory rated equivalent speed , the corresponding rated target value of the low-pressure turbine rear gas temperature is the factory rated equivalent temperature ; wherein, the low-pressure factory rated equivalent speed high-pressure delivery rating and delivery rating are the output power of the hydraulic dynamometer at the time of factory test, corrected to the rated output power, with respect to the intake resistance, the exhaust resistance and the atmospheric environment, respectively the low-pressure compressor speed, the high-pressure compressor speed and the low-pressure turbine exhaust gas temperature at the time of the rated output power.

[0013] The further technical solution is that the maneuverability test stage of the test map includes a plurality of continuous maneuvering conditions, and the duration of each maneuvering condition does not exceed the maximum switching duration, and the ship gas turbine performance test method further comprises:

[0014] According to the test map, the next maneuvering condition of the current condition of the ship gas turbine is determined as the target maneuvering condition, and after the current condition is ended, the high-pressure compressor speed of the ship gas turbine control the ship gas turbine to rise and fall conditions until switching to the target maneuvering condition.

[0015] The further technical solution is that the high-pressure compressor speed of the ship gas turbine control the ship gas turbine to rise and fall conditions includes:

[0016] control the ship gas turbine to rise and fall conditions until the high-pressure compressor speed of the ship gas turbine reaches the target speed value, and the target speed value is related to the target maneuvering condition and the real-time temperature .

[0017] The further technical solution is that when , the target speed value is determined;

[0018] When , the target speed value is determined;

[0019] Wherein, is the high-pressure compressor speed at the time of the rated output power, when the output power of the hydraulic dynamometer at the time of factory test is corrected to the rated output power, with respect to the intake resistance, the exhaust resistance and the atmospheric environment, is the high-pressure compressor speed when the target maneuvering condition is reached for the last time in the process of controlling the ship gas turbine to perform performance test according to the test map, is a parameter related to the real-time temperature .

[0020] The further technical solution is that , ​is the temperature when the ship gas turbine is controlled according to the test map and the target maneuvering working condition is reached in the process of performance test.

[0021] The beneficial technical effects of the present application are:

[0022] The present application discloses a ship gas turbine performance test method based on a test map, which no longer controls the running state of the ship gas turbine according to the measured output power of the hydraulic dynamometer, but uses different parameters as control basis in different test stages, so as to ensure that the ship gas turbine accurately performs performance test according to the test map without over-temperature and over-speed, and the test accuracy and reliability are higher, and the method is simple, effective and highly operable.

[0023] In the process of steady-state performance test, the measured output power can reach the required power under 1.0 working condition, so the measured output power is directly used for control, and under 1.0 working condition, the measured output power cannot reach the rated output power due to the influence of environmental temperature, so the measured output power, low-pressure compressor speed, high-pressure compressor speed and low-pressure turbine rear gas temperature are comprehensively considered, and the corresponding rated target value is reached first, so that the ship gas turbine can be tested under the specified working condition without over-temperature and over-speed, and the accuracy is higher.

[0024] In the maneuverability test stage, the high-pressure compressor speed is used as the basis to control the working process of the ship gas turbine, which can accurately and quickly control the ship gas turbine to change the working condition, meet the requirements of maneuverability variable working condition time examination, avoid the control deviation caused by the power lag of the hydraulic dynamometer, and further improve the control accuracy by referring to the historical data in the process of performance test of the ship gas turbine controlled according to the test map and combining temperature correction to determine the target speed value, so as to be more consistent with the actual environmental characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the test map in an example.

[0026] Figure 2 is a method flowchart for performing steady-state performance test on the ship gas turbine in an embodiment of the present application.

[0027] Figure 3 is a method flowchart for performing maneuverability test stage on the ship gas turbine in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described below with reference to the accompanying drawings.

[0029] The application discloses a marine gas turbine performance test method based on a test map. The test map indicates a working condition change curve over time. The marine gas turbine performance test method controls the working condition change of the marine gas turbine according to the test map to perform performance test on the marine gas turbine. Different test maps will form different curve forms. The method of the application can be applied to various forms of test maps. In actual test, the performance test of the marine gas turbine may need to be controlled according to multiple test maps. Therefore, the method of the application can be applied to the process of performance test based on any test map.

[0030] Regardless of the specific curve form of the test map, the test map always includes a steady state test phase and a maneuverability test phase. The steady state test phase is used to perform steady state performance test on the running condition of the marine gas turbine under multiple typical working conditions. The maneuverability test phase is used to perform maneuverability performance test on the running condition of the marine gas turbine under frequent working condition adjustment within a certain time. Generally, the test map sequentially includes the steady state test phase and the maneuverability test phase from the start of the test, as shown in the following figure: Figure 1 That is, the marine gas turbine first performs steady state performance test and then performs maneuverability performance test after starting. In actual application, the test map may also include multiple cycles of the steady state test phase and the maneuverability test phase.

[0031] The steady state test phase of the test map includes multiple continuous steady state working conditions. Each steady state working condition has a corresponding steady state test duration. The steady state test duration is used to indicate the duration of the stable running of the marine gas turbine under the steady state working condition. The steady state test durations of the steady state working conditions can be equal or unequal. However, the steady state test durations of all the steady state working conditions reach the minimum steady state duration, which is a preset value.

[0032] The maneuverability test phase of the test map includes multiple continuous maneuvering working conditions. Each maneuvering working condition corresponds to a continuous duration. The continuous durations of the maneuvering working conditions can be equal or unequal. However, none of the continuous durations exceeds the maximum switching duration, which is a preset value. Unlike the steady state test phase, since the maneuverability test phase needs to test the maneuverability of the marine gas turbine during the frequent switching of the working conditions, the maneuvering working conditions need to be quickly switched, that is, the continuous duration of each maneuvering working condition is relatively short. For example, the duration for switching from the idle working condition (0 working condition) to the 1.0 working condition cannot exceed 120s.

[0033] In the process of performing steady state performance test on the marine gas turbine, the method of the marine gas turbine performance test method includes, please refer to the flow chart shown in the following figure: Figure 2

[0034] ​According to the test map, the next steady state working condition of the current working condition of the marine gas turbine is determined as a target steady state working condition, and a target power percentage corresponding to the target steady state working condition is determined In the test map, the working condition curve over time is represented by the power percentage curve over time, whether it is a steady state working condition or a maneuvering working condition, and each working condition corresponds to a power percentage. For example, based on the test map Figure 1 When the marine gas turbine is just started, the current working condition is the idle working condition (0 working condition), the next steady state working condition is the 0.4 working condition, and the corresponding power percentage is 0.4. For example, when the current working condition of the marine gas turbine at the 6th hour is the 1.0 working condition, the next steady state working condition is the 0.6 working condition, and the corresponding power percentage is 0.6. Other cases are similar. In practical applications, the current working condition is often a steady state working condition, but the application does not exclude the case where the current working condition is a maneuvering working condition.

[0035] When the target power percentage , after ending the current working condition, the actual output power of the marine gas turbine is controlled according to the water dynamometer of the marine gas turbine until the target steady state working condition is switched to and continuously operated according to the target steady state working condition. It includes: controlling the marine gas turbine to ascend or descend the working condition until the actual output power of the water dynamometer of the marine gas turbine reaches , it is determined that the target steady state working condition has been switched to and continuously operated according to the target steady state working condition, is the rated output power of the marine gas turbine under standard working conditions. When the current working condition is higher than the target steady state working condition, the working condition of the marine gas turbine is controlled to descend, for example Figure 1 from the 1.0 working condition to the 0.6 working condition. When the current working condition is lower than the target steady state working condition, the working condition of the marine gas turbine is controlled to ascend, for example Figure 1 from the 0.6 working condition to the 0.9 working condition. The standard working conditions are usually 27°C and one standard atmosphere.

[0036] When the target power percentage , the current working condition is always lower than the target steady state working condition, so after ending the current working condition, the actual output power of the marine gas turbine is controlled according to the water dynamometer of the marine gas turbine, the low-pressure compressor speed, the high-pressure compressor speed, and the low-pressure turbine rear gas temperature until the target steady state working condition is switched to and continuously operated according to the target steady state working condition. It includes: controlling the marine gas turbine to ascend the working condition until the actual output power of the water dynamometer of the marine gas turbine, the low-pressure compressor speed , the high-pressure compressor speed , and the low-pressure turbine rear gas temperature When any one of the four parameters reaches its corresponding rated target value, it is determined that the system has switched to the target steady-state operating condition and will continue to operate under that condition. If any one of these four parameters reaches its corresponding rated target value, the operating condition will not be upgraded further, and the parameter that first reaches its rated target value will be used as the benchmark.

[0037] Among them, the measured output power The corresponding rated target value is the rated output power of the marine gas turbine under standard operating conditions. Low-pressure compressor speed The corresponding rated target value is the factory rated speed for low-pressure applications. High pressure compressor speed The corresponding rated target value is the factory-converted rated speed for high voltage. Low-pressure turbine afterburner temperature The corresponding rated target value is the factory rated equivalent temperature. Low-voltage factory rated speed High-voltage factory rated speed and factory rated equivalent temperature These are the output power of the hydraulic dynamometer during factory testing, adjusted for intake resistance, exhaust resistance, and atmospheric environmental factors to the rated output power under standard operating conditions. The low-pressure compressor speed, high-pressure compressor speed, and low-pressure turbine afterburner gas temperature are measured. This step can be referenced in standard CB 20429-2018, "Data Processing Method for Thermodynamic Performance Tests of Marine Gas Turbines," and will not be elaborated further in this embodiment.

[0038] That is, during the steady-state performance test of the marine gas turbine according to the test chart, when the target power percentage At that time, since the actual output power of the marine gas turbine could meet the required power value, the conventional practice was to measure the output power. To control marine gas turbines. However, the target power percentage... However, due to the influence of ambient temperature, the actual output power of marine gas turbines may not reach the rated output power. Therefore, the measured output power must be considered comprehensively. Low-pressure compressor speed High-pressure compressor speed Low-pressure turbine afterburner gas temperature To adjust the operating conditions.

[0039] In the process of conducting maneuverability tests on marine gas turbines, the methods for testing the performance of marine gas turbines also include, for example... Figure 3 As shown:

[0040] determining the next maneuvering condition of the current condition of the marine gas turbine as a target maneuvering condition according to the test map, and after ending the current condition, controlling the marine gas turbine to rise and fall conditions according to the high-pressure compressor speed of the marine gas turbine The marine gas turbine is controlled to rise and fall conditions until switching to the target maneuvering condition. That is, in order to meet the time evaluation requirement of the variable condition in the process of the maneuvering performance test, the embodiment no longer controls the marine gas turbine to rise and fall conditions according to the conventional method of referring to the measured output power , but instead refers to the high-pressure compressor speed , avoiding the problem of affecting the test process due to the lag of the hydraulic dynamometer.

[0041] The marine gas turbine is controlled to rise and fall conditions according to the high-pressure compressor speed of the marine gas turbine , including: controlling the marine gas turbine to rise and fall conditions until the high-pressure compressor speed of the marine gas turbine reaches a target speed value, determining that the marine gas turbine has switched to the target maneuvering condition.

[0042] The target speed value is related to the target maneuvering condition and the real-time temperature , so the step of determining the target speed value is actually included first. When , the target speed value is determined as , when , the target speed value is determined as . The meaning of the high-pressure factory rated equivalent speed is as above, is the high-pressure compressor speed when the target maneuvering condition is reached for the last time in the process of controlling the marine gas turbine to perform the performance test according to the test map, is a parameter related to the real-time temperature . In an embodiment, , is the temperature when the target maneuvering condition is reached for the last time in the process of controlling the marine gas turbine to perform the performance test according to the test map.

[0043] For example, assuming that the rated output power of the marine gas turbine at 27°C and one standard atmosphere is , the performance test of the marine gas turbine is performed according to the test map of Figure 1 . First, the marine gas turbine is controlled to start and pass the 0.5h start successfully, determining that the next steady condition is 0.4 condition, and the target power percentage is 0.4 less than 1, so the marine gas turbine is controlled to rise conditions until the measured output power of the hydraulic dynamometer reaches 0.4*35MW=14MW, determining that it has switched to 0.4 condition, and continuously running in 0.4 condition for 1.5h.

[0044] When the marine gas turbine is tested at 0.4 operating condition, the next steady operating condition is determined to be 0.2 operating condition, and the target power percentage is 0.2, which is less than 1, so the marine gas turbine is controlled to reduce the operating condition until the measured output power of the water dynamometer reaches 7 MW, it is determined that the operating condition has been switched to 0.2 operating condition, and the steady operation at 0.2 operating condition is continued for 1 h.

[0045] In this way, the tests are sequentially carried out at 0.2 operating condition and 0.7 operating condition, when the marine gas turbine is tested at 0.7 operating condition, the next steady operating condition is determined to be 1.0 operating condition, and the target power percentage is equal to 1, so the measured output power , the low-pressure compressor speed , the high-pressure compressor speed , the low-pressure turbine exhaust gas temperature are monitored at the same time. It is assumed that when , , , the low-pressure compressor speed reaches first, it is determined that the operating condition has been switched to 1.0 operating condition, and the operating condition is stopped to be increased, and the operation is continued according to the current operating parameters. As can be seen from this example, the measured output power may not have reached , and if the conventional method is used for control, it will cause deviation in the test process.

[0046] The other steady operating conditions are switched and tested according to the above process, and when the maneuverability test stage is entered, since this stage has a clear requirement for the variable operating condition time, another control mechanism is used to control the operating condition of the marine gas turbine according to the high-pressure compressor speed . It is assumed that the current operating condition is the idle operating condition, and the next maneuvering operating condition is 1.0 operating condition. It is assumed that the current real-time temperature is 283 K, and in the process of controlling the marine gas turbine according to the test map to perform performance test, the last time when the target maneuvering operating condition (1.0 operating condition) is reached is 2.5 h of running process at 1.0 operating condition, at which time the high-pressure compressor speed is 10100 r / min, and the temperature is 293 K, so , the high-pressure factory rated equivalent speed can be calculated. Since , the target speed value is determined, and the marine gas turbine is controlled to increase the operating condition until the high-pressure compressor speed reaches , it is determined that the operating condition has been switched from the idle operating condition to 1.0 operating condition, and the subsequent switching process is similar.

[0047] The above merely describes the preferred embodiments of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or thought by those skilled in the art without departing from the spirit and concept of the present application shall be considered to be included in the protection scope of the present application.

Claims

1. A method of testing the performance of a marine gas turbine based on a test map, characterized by, The test map comprises a steady-state test phase and a maneuverability test phase, the steady-state test phase of the test map comprises a plurality of continuous steady-state working conditions, and a steady-state test duration of each steady-state working condition reaches a minimum steady-state duration; The maneuverability test phase comprises a plurality of continuous maneuvering working conditions, and a corresponding duration of each maneuvering working condition does not exceed a maximum switching duration; The ship gas turbine performance test method comprises: determining a next steady state operating condition of the current operating condition of the marine gas turbine according to the test map as a target steady state operating condition, and determining a target power percentage corresponding to the target steady state operating condition ; when the target power percentage when the target power percentage when the target power percentage when the target power percentage after ending the current operating condition, according to the measured output power of the water dynamometer of the marine gas turbine , the low-pressure compressor speed , the high-pressure compressor speed , the low-pressure turbine rear gas temperature , the marine gas turbine is controlled to be in an up operating condition until switching to the target steady operating condition, and the marine gas turbine is continuously operated according to the target steady operating condition, the marine gas turbine is controlled to be in an up operating condition until the measured output power of the water dynamometer of the marine gas turbine , the low-pressure compressor speed , the high-pressure compressor speed , the low-pressure turbine rear gas temperature , one parameter in the measured output power, the low-pressure compressor speed, the high-pressure compressor speed and the low-pressure turbine rear gas temperature reaches the corresponding rated target value, it is determined that the target steady operating condition has been switched to and continuously operated according to the target steady operating condition, and the parameter that reaches the corresponding rated target value first in the measured output power, the low-pressure compressor speed, the high-pressure compressor speed and the low-pressure turbine rear gas temperature is used as the criterion. determining a next maneuvering operating condition of the current operating condition of the marine gas turbine as a target maneuvering operating condition according to the test map, and after ending the current operating condition, controlling the marine gas turbine to operate in a high pressure compressor speed controlling the marine gas turbine to operate in the target maneuvering operating condition.

2. The marine gas turbine performance test method according to claim 1, characterized by, Controlling the ship gas turbine to switch to the target steady-state working condition comprises: when the target power percentage is reached, the ship gas turbine is controlled to ascend the operating condition until the measured output power of a hydraulic dynamometer of the ship gas turbine reaches a rated output power of the ship gas turbine, is determined that the target steady state operating condition has been switched to and the ship gas turbine continues to operate according to the target steady state operating condition.

3. The method of gas turbine performance testing for marine use according to claim 2, characterized in that, measured output power the corresponding rated target value is the rated output power of the marine gas turbine low-pressure compressor speed the corresponding rated target value is the low-pressure factory rated equivalent speed high-pressure compressor speed the corresponding rated target value is the high-pressure factory rated equivalent speed low-pressure turbine rear gas temperature the corresponding rated target value is the factory rated equivalent temperature ; wherein the low-pressure factory rated equivalent speed the high-pressure factory rated equivalent speed and the factory rated equivalent temperature are respectively the low-pressure compressor speed, the high-pressure compressor speed and the low-pressure turbine rear gas temperature when the output power of the water dynamometer is corrected to the rated output power of the marine gas turbine during the factory test.

4. The marine gas turbine performance test method of claim 1, wherein According to the high-pressure compressor rotation speed of the marine gas turbine Controlling the marine gas turbine up / down operating conditions includes: controlling the marine gas turbine to climb conditions up to a high pressure compressor speed of the marine gas turbine determining that the marine gas turbine has switched to the target maneuvering condition upon reaching a target speed value, the target speed value being related to the target maneuvering condition and a real-time temperature ​ 5. The ship gas turbine performance test method according to claim 4, characterized in that, When the target rotational speed value is determined When the target rotational speed value is determined wherein, is the high pressure compressor speed at the time of the factory test when the output power of the hydraulic dynamometer is corrected to the rated output power with respect to the intake resistance, the exhaust resistance, and the atmospheric environment, is the high pressure compressor speed at the time when the target maneuvering operating condition is reached for the last time in the process of performing a performance test on the marine gas turbine according to the test map, is a parameter related to the real-time temperature .​ 6. The method of gas turbine performance testing for marine use according to claim 5, characterized in that, , is the temperature at the last in time reaching of the target maneuvering operating condition during the performance test of the marine gas turbine according to the test map.

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