Gas turbine compressor internal air salt content test device and test system

Abstract

The present invention relates to a device and system for testing the salt content of air inside a gas turbine compressor. The device comprises at least one negative pressure sampling device and at least one positive pressure sampling device. The air collection end of the at least one negative pressure sampling device is disposed within the intake duct of the gas turbine compressor to collect air entering the gas turbine compressor. The air collection end of the at least one positive pressure sampling device is disposed within the gas turbine compressor to collect air within the gas turbine compressor. A hybrid system of positive pressure sampling devices and negative and positive pressure sampling devices is employed to sample the gas turbine compressor inlet and different locations within the gas turbine compressor, respectively. This allows for testing the salt content of high-temperature, high-pressure air within the gas turbine compressor, thereby addressing the shortcomings of traditional simulation studies.

Description

Technical Field

[0001] The present invention relates to the field of gas turbine compressor performance testing research, and in particular to a device for testing the salt content of air inside a gas turbine compressor and a testing system provided with the device. Background Art

[0002] Currently, the existing technology for testing the salt content of gas turbine intake systems mainly focuses on the intake filtration system. The intake filtration system has a large air resistance, so the salt content testing, sampling and analysis before and after the intake filtration system are mainly carried out in a negative pressure environment. Usually, the ocean intake salt spray environment is simulated in the laboratory, and the variable frequency fan is used to simulate different intake flow rates and different operating conditions of the gas turbine. Figure 1 As shown in the figure, in the air intake system performance test section, an isokinetic sampling system suitable for negative pressure air collection is used to collect air before and after the filter section for subsequent analysis.

[0003] This solution cannot be applied to the test of salt content inside a gas turbine compressor. This is because: first, the inside of a gas turbine compressor is a positive pressure environment with high temperature and high pressure, so the existing negative pressure sampling system based on the salt content analysis of the intake filtration system is not applicable; second, the flow inside the intake filtration system is low-speed, so the intake sampling can be done by invasive sampling, which has little interference and impact on the flow; while the flow inside the gas turbine compressor is high-speed, and if invasive sampling is used, the interference and impact on the flow are large, and it is very dangerous. If a part is not firmly fixed and falls into the gas turbine compressor, it will cause damage to the engine. Therefore, the salt content test inside the gas turbine compressor must use non-invasive sampling.

[0004] By testing the salt content before and after the air intake filtration system, the salt content entering the gas turbine can be indirectly evaluated. However, this method cannot obtain the distribution of salt inside the gas turbine, especially the gas turbine compressor, making it difficult to provide an accurate basis for the corrosion resistance design of the gas turbine and the gas turbine compressor.

[0005] Moreover, previous research on the salt content inside gas turbine compressors mainly used numerical simulation as the main means. By conducting multiphase flow simulation research on particulate matter at different positions in the gas turbine compressor, the salt deposition law and blade corrosion law were studied. The lack of experimental methods and experimental data comparison has seriously affected the progress of scientific research. Summary of the Invention

[0006] (1) Technical issues to be solved

[0007] The technical problem to be solved by the present invention is to change the traditional method of over-reliance on simulation in studying the salt content inside the gas turbine compressor, and to make up for the shortcomings in testing the salt content inside the gas turbine compressor.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a device for testing the salt content of air inside a gas turbine compressor, comprising at least one negative pressure sampling device and at least one positive pressure sampling device;

[0010] The air collection end of the at least one negative pressure sampling device is arranged in the air intake duct of the gas turbine compressor to collect air entering the gas turbine compressor;

[0011] The air collection end of the at least one positive pressure sampling device is arranged in the gas turbine compressor to collect air in the gas turbine compressor.

[0012] Preferably, there are multiple positive pressure sampling devices;

[0013] The air collection ends of the multiple positive pressure sampling devices are respectively arranged at different air pressure levels of the gas turbine compressor; or at least one air collection end of the positive pressure sampling device is arranged at each air pressure level of the gas turbine compressor.

[0014] Preferably, the negative pressure sampling device includes a negative pressure sampling probe, a negative pressure collection pipeline and a negative pressure collection device;

[0015] The negative pressure sampling probe is connected to the negative pressure collection device through the negative pressure collection pipeline;

[0016] The negative pressure sampling probe is arranged in the air intake duct of the gas turbine compressor.

[0017] Preferably, the positive pressure sampling device includes a positive pressure sampling probe, a positive pressure collection pipeline and a positive pressure collection device;

[0018] The positive pressure sampling probe is connected to the positive pressure collection device through the positive pressure collection pipeline;

[0019] The positive pressure sampling probe is arranged in the gas turbine compressor.

[0020] Preferably, the sampling port of the negative pressure collection probe is arranged to face the direction of the airflow;

[0021] The sampling port of the positive pressure sampling probe is arranged to face the direction of the airflow.

[0022] Preferably, it further comprises an air induction regulating device, which is installed on each of the positive pressure collection pipelines and / or the negative pressure collection pipelines.

[0023] Preferably, the sampling port of the negative pressure sampling probe and / or the sampling port of the positive pressure sampling probe is a thin-walled sampling port.

[0024] Preferably, the negative pressure collection pipeline and / or the positive pressure collection pipeline is a copper tube.

[0025] Preferably, the negative pressure collection device includes a negative pressure absorption device and a negative pressure flow testing device connected to each other;

[0026] And / or the positive pressure collection device includes a positive pressure absorption device and a positive pressure flow testing device connected to each other.

[0027] The present invention also provides a gas turbine compressor internal air salt content testing system, comprising the gas turbine compressor internal air salt content testing device as described above.

[0028] (3) Beneficial effects

[0029] The above technical solution of the present invention has the following advantages:

[0030] 1. A hybrid system of positive pressure sampling devices and negative positive pressure sampling devices is used to sample the gas turbine compressor inlet and different locations inside the gas turbine compressor. The salt content of the high-temperature and high-pressure air inside the gas turbine compressor can be tested to make up for the shortcomings of traditional simulation research.

[0031] 2. By setting up multiple positive pressure sampling devices at different pressure levels in the gas turbine compressor, the salt content of the air in different pressure levels can be fully detected, the measurement is more accurate, and strict and accurate data support is provided for understanding the distribution law of salt between the blades of multi-stage gas turbine compressors.

[0032] 3. The sampling port of the positive pressure sampling probe is kept on the same axis as the airflow direction, and the sampling port of the negative pressure sampling probe is kept on the same axis as the airflow direction in the intake duct, and the sampling port faces the airflow. Adjust the air inlet regulating device installed on the positive pressure collection pipeline to keep the sampling inlet flow velocity consistent with the flow velocity of the intake duct. In this way, a relatively ideal coaxial isokinetic sampling state is basically achieved, and the salt mist aerosol particles in the intake duct can be inhaled with an efficiency of nearly 100%, ensuring that the sampling is well representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a gas turbine compressor salt content test bench in the prior art;

[0034] Figure 2 This is a schematic structural diagram of a device for testing the salt content of air inside a gas turbine compressor according to the present invention;

[0035] Figure 3 It is a structural schematic diagram of the negative pressure sampling device in the present invention.

[0036] Figure: 1. Inlet guide section; 2. Inlet rectifier grille section; 3. Salt spray injection and mixing section; 4-5. Inlet system performance test section (sampling test location); 6. Structural contraction section; 7. Wind tunnel flow test section; 8. Air source system; 9. Exhaust section.

[0037] 01. Positive pressure sampling device; 02. Negative pressure sampling device; 03. Gas turbine; 04. Air inlets at different stages and positions of gas turbine compressor;

[0038] 011. Positive pressure sampling probe; 012. Positive pressure collection pipeline; 013. Positive pressure collection device; 014. Bleed air regulating device;

[0039] 0131; Positive pressure absorption device; 0132, Positive pressure flow testing device. DETAILED DESCRIPTION

[0040] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] Figure 2 This is a schematic diagram of the structure of a gas turbine compressor internal air salt content test device of the present invention. Figure 2As shown, the equipment includes at least one negative pressure sampling device 02 and at least one positive pressure sampling device 01; the air collecting end of the at least one negative pressure sampling device 02 is arranged in the air inlet duct of the gas turbine compressor to collect the air entering the gas turbine compressor; the air collecting end of the at least one positive pressure sampling device 01 is arranged in the gas turbine compressor to collect the air in the gas turbine compressor.

[0044] The salt content of the air before entering the compressor is measured using the negative pressure sampling device 02, while the salt content of the air inside the compressor is measured using the positive pressure sampling device 01. The specific content and distribution of trace salts within the compressor are derived from these two salt contents. This testing device addresses the numerous difficulties in sampling and analyzing salt content within the gas turbine compressor, thereby providing precise support for the corrosion resistance design of the gas turbine 03. The device proposed in this invention utilizes a mixed positive and negative pressure sampling system to sample both the gas turbine compressor inlet and the interior of the gas turbine compressor, resolving the inadequacy of existing dynamic sampling systems such as negative pressure.

[0045] As a preferred embodiment, there are multiple positive pressure sampling devices 01; the air collection ends of the multiple positive pressure sampling devices 01 are respectively arranged at different air pressure levels of the gas turbine compressor.

[0046] Specifically, three positive pressure sampling devices 01 are provided. Their air collection ports are located at the third, sixth, and ninth pressure levels of the gas turbine compressor, respectively, to collect salt content in the air at these pressure levels. This allows the three positive pressure sampling devices 01 to detect the specific trace salt content at the third, sixth, and ninth pressure levels of the gas turbine compressor, providing more accurate test results and providing precise support for the corrosion resistance design of the gas turbine 03. Sampling air at the gas turbine compressor inlet and at various locations within the compressor allows for understanding the distribution of salt between the blades of a multi-stage gas turbine compressor. This allows for better assessment of the permissible salt content in the inlet air and its impact on gas turbine compressor performance. Furthermore, it allows for in-depth research into the salt distribution mechanism within the gas turbine 03, optimizing the design of the gas turbine 03 flow path, and providing a crucial basis for improving the performance and reliability of the gas turbine 03.

[0047] Of course, in order to further improve the accuracy of the detection results, more than one positive pressure sampling device 01 can be set at each air pressure level; for example, two positive pressure sampling devices 01 are set at the sixth air pressure level of the gas turbine compressor.

[0048] Figure 3 It is a structural diagram of the positive pressure sampling device in the present invention, Figure 2 The positive pressure sampling device in the figure omits part of the positive pressure flow test device 0132. Figure 3 The positive pressure sampling device 01 includes a positive pressure sampling probe 011, a positive pressure collection pipeline 012 and a positive pressure collection device 013; the positive pressure sampling probe 011 is connected to the positive pressure collection device 013 through the positive pressure collection pipeline 012; the positive pressure sampling probe 011 is arranged in the air intake duct of the gas turbine compressor.

[0049] The positive pressure sampling device 01 is mainly used for sampling and measuring the salt content of the air inside the gas turbine compressor.

[0050] A plurality of positive pressure sampling probes 011 are connected to the air inlets 04 at different positions at different stages of the gas turbine compressor.

[0051] The sampling port of the positive pressure sampling probe 011 is aligned with the airflow direction, and a bleed air regulating device 014 is installed on the positive pressure collection pipeline 012. The sampling port of the positive pressure sampling probe 011 is aligned with the airflow direction and aligned with the airflow. The bleed air regulating device 014 installed on the positive pressure collection pipeline 012 is adjusted to keep the sampling inlet flow rate consistent with the flow rate of the air within the gas turbine compressor. This essentially achieves a relatively ideal coaxial isokinetic sampling state, capable of inhaling medium-salt mist aerosol particles from the intake duct with nearly 100% efficiency, ensuring that the sampling is highly representative.

[0052] As another optional real-time method, the sampling port of the positive pressure sampling probe 011 is a thin-walled sampling port (the ratio of the outer diameter to the inner diameter of the sampling port is less than 1.1), which will not affect the airflow and will not cause particle rebound at the pipe mouth.

[0053] In a preferred embodiment, the bleed air regulating device 014 includes at least one of the following: a stop valve, a pressure reducing valve, and a flow regulating valve.

[0054] Preferably, since the introduced gas is high-temperature gas, the positive pressure collection pipeline 012 uses a copper tube with good heat dissipation. In order to further improve the heat dissipation, a slender copper tube is generally used, and the diameter of the copper tube is much smaller than the length of the copper tube. In conjunction with the control of the introduced air flow rate by the air introduction regulating device 014 installed on the positive pressure collection pipeline 012, the temperature is greatly reduced before entering the positive pressure collection device 013.

[0055] As an alternative real-time method, the positive pressure collection device 013 includes a positive pressure absorption device 0131 and a positive pressure flow test device 0132, which are interconnected. The positive pressure absorption device 0131 comprises a sampling absorption bottle and an absorption liquid contained therein. The positive pressure flow test device 0132 comprises a flow test line with one end immersed in the absorption liquid and a positive pressure sampling pump connected to the other end of the flow test line. The flow test line is also equipped with a flow sensor and a flow control valve.

[0056] In this embodiment, ultrapure water is used as the absorption liquid.

[0057] The positive pressure sampling device 01 provided in the above embodiment is only a limited embodiment. Other devices capable of sampling and testing the salt content of the air inside the gas turbine compressor are within the scope of protection of the present invention.

[0058] The negative pressure sampling device 02 has the same structure as the positive pressure sampling device 01 described above, and will not be described in detail here.

[0059] Negative pressure sampling device 02 is primarily used for sampling and measuring the salinity of air upstream of the gas turbine compressor, and is used to calibrate the salinity level upstream of the gas turbine compressor. The negative pressure sampling system utilizes the same isokinetic sampling device used for salt content testing in intake filtration systems, with negative pressure sampling as its primary feature. The negative pressure sampling probe extends into the intake duct upstream of the gas turbine compressor and is threadedly connected to the intake duct casing. The remaining equipment is located externally of the intake duct and casing.

[0060] Before testing, the gas turbine must be built

[0061] The test bench for salt content testing of the flow section of each stage of the compressor is usually carried out on a gas turbine complete unit test bench. The gas turbine complete unit test bench is equipped with a salt spray generation system, a bleed air conditioning system, and other test systems.

[0062] Salt mist generation systems are used to generate salt mist that meets certain salt concentration and particle size requirements at the front end of a gas turbine compressor, simulating the air quality at the gas turbine compressor inlet after filtration by the intake filtration system. These systems are typically pneumatic atomizing salt mist spray systems or ultrasonic mist generation systems.

[0063] The specific test methods and processes are as follows:

[0064] 1. Preparation before the test

[0065] (1) Use ultrapure water to clean all pipes and sampling absorption bottles in the sampling test device to ensure that there is no sodium chloride or sodium ions when the equipment is in use, so as not to affect the test results;

[0066] (2) Pour a certain amount of ultrapure water into a sampling absorption bottle, record the mass of the ultrapure water in the sampling absorption bottle, take a sample for base salt content test and record the measurement results;

[0067] (3) Check the connection of the sampling system pipelines and circuits;

[0068] (4) Check the test bench.

[0069] 2. Test steps

[0070] (1) Use NaCl reagent for chemical analysis and ultrapure water in a certain ratio and mix them evenly with the intake air flow to simulate the salt spray environment of gas turbine 03 intake air. The simulated salt spray concentration required in this test is 0.01ppm.

[0071] (2) Start gas turbine 03;

[0072] (3) After the gas turbine 03 is stable at a certain operating condition (such as operating condition 1.0), start the negative pressure sampling device 02 and the positive pressure sampling device 01, adjust the sampling flow rate to the set value, and record the sampling start time;

[0073] (4) Sampling for a specific time (e.g., 45 minutes), recording the stop time, and closing the sampling device;

[0074] (5) Use ultrapure water to clean each sampling line and sampling absorption bottle respectively, and keep the ultrapure water used for cleaning in the corresponding sampling absorption bottle;

[0075] (6) Take a sample of the solution in the sampling absorption bottle and measure the salt content using an ion chromatograph.

[0076] 3. Post-test work

[0077] (1) Use ultrapure water to clean the sampling absorption bottle;

[0078] (2) Clean the test pipeline;

[0079] (3) Arrange the ion chromatograph;

[0080] (4) Organize the dynamic sampling system.

[0081] (5) Analyze the experimental data. Analyze whether the salt content distribution pattern at each level before and inside the gas turbine compressor meets the regularity requirements, such as the salt content decreasing at each level. If the test data is abnormal, analyze the cause and conduct another test if necessary.

[0082] The positive and negative pressure sampling system dissolves the NaCl in the air sample in the pure water in the sampling absorption bottle. Using chemical analysis methods, the ion chromatograph measures the concentration of chloride ions in the water samples before and after sampling. The salt concentration in the airflow at different positions is calculated according to the relevant formula. The calculation process is as follows:

[0083] The known parameters in the intake salt spray measurement test are as follows:

[0084] Sampling volume flow Q (L / min)

[0085] Absorption solution mass M1 (kg)

[0086] Cleaning solution mass M2 (kg)

[0087] Sampling time t(min)

[0088] Measure the base chloride ion concentration η1 (ppm) in the sampling absorption bottle before sampling

[0089] Measure the chloride ion concentration η2 (ppm) in the sampling absorption bottle after sampling

[0090] Air density ρ1 (kg / m3)

[0091] The air salt content η (ppm) can be obtained from the above conditions:

[0092] The mass M of the base NaCl in the absorption bottle before sampling is deduced from the base chloride ion concentration η1 in the absorption bottle before sampling 基 :

[0093] M 基 =M1×η1×10-6×58.5 / 35.5(kg)

[0094] The mass M of NaCl in the absorption bottle after sampling is deduced from the chloride ion concentration η2 in the absorption bottle after sampling 测 :

[0095] M 测 =(M1+M2)×η2×10-6×58.5 / 35.5(kg)

[0096] From the above, we can conclude that the mass of NaCl in the sampled air is M NaCl :

[0097] M NaCl = Mmeasured - Mbase = [(M1+M2)×η2-M1×η1]×10-6×58.5 / 35.5(kg)

[0098] Sampling air quality M:

[0099] Mspace = ρ1 × Q × t × 10-3 (kg)

[0100] Therefore, the air salt content η is deduced

[0101] η=(MNaCl / Mempty)×106=103×[(M1+M2)×η2-M1×η1]×58.5 / (35.5×ρ1×Q×t)(ppm)

[0102] Data recording requirements

[0103] a. When recording test data, the working conditions must be stable each time. If the working conditions are changed, sampling and recording can only be carried out after the working conditions are normal and stable;

[0104] b. The sampling time for air salt concentration is 45 minutes;

[0105] c. Data records should be complete and valid, and a test and analysis report should be prepared after the test is completed.

[0106] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the method, the relevant parts can refer to the partial description of the device embodiment (adopted according to the writing situation). The present invention is not limited to the specific steps and structures described above and shown in the figures. In addition, for the sake of brevity, a detailed description of known method technologies is omitted here.

[0107] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas turbine compressor internal air salt content testing device, characterized in that: Comprising at least one negative pressure sampling device (02) and at least one positive pressure sampling device (01); The air collection end of the at least one negative pressure sampling device (02) is arranged in the air intake duct of the gas turbine compressor to collect air entering the gas turbine compressor; The air collection end of the at least one positive pressure sampling device (01) is arranged in the gas turbine compressor to collect air in the gas turbine compressor; There are multiple positive pressure sampling devices (01); The air collection ends of the plurality of positive pressure sampling devices (01) are respectively arranged at different air pressure levels of the gas turbine compressor; or at least one air collection end of the positive pressure sampling device (01) is arranged at each air pressure level of the gas turbine compressor, and the negative pressure sampling device (02) comprises a negative pressure sampling probe, a negative pressure collection pipeline and a negative pressure collection device; Multiple positive pressure sampling probes are connected to air bleed ports at different positions of different stages of the gas turbine compressor; The sampling port of the positive pressure sampling probe is set in the direction of the airflow, and an air bleed regulating device is installed on the positive pressure collection pipeline; The negative pressure sampling probe is connected to the negative pressure collection device through the negative pressure collection pipeline; The negative pressure sampling probe is arranged in the air intake duct of the gas turbine compressor; The positive pressure sampling device (01) comprises a positive pressure sampling probe (011), a positive pressure collection pipeline (012) and a positive pressure collection device (013); The positive pressure sampling probe (011) is connected to the positive pressure collection device (013) through the positive pressure collection pipeline (012); The positive pressure sampling probe (011) is arranged in the gas turbine compressor; The sampling port of the negative pressure sampling probe is arranged to face the direction of the airflow; The sampling port of the positive pressure sampling probe (011) is arranged to face the direction of the airflow.

2. The gas turbine compressor internal air salt content testing device according to claim 1, characterized in that: It also includes an air induction regulating device (014), which is installed on each of the positive pressure collection pipelines (012) and / or the negative pressure collection pipelines.

3. The gas turbine compressor internal air salt content testing device according to claim 1, characterized in that: The sampling port of the negative pressure sampling probe and / or the sampling port of the positive pressure sampling probe (011) are thin-walled sampling ports.

4. The gas turbine compressor internal air salt content testing device according to claim 1, characterized in that: The negative pressure collection pipeline and / or the positive pressure collection pipeline (012) are copper tubes.

5. The gas turbine compressor internal air salt content testing device according to claim 1, characterized in that: The negative pressure collection device includes a negative pressure absorption device and a negative pressure flow testing device connected to each other; And / or the positive pressure collection device (013) includes a positive pressure absorption device (0131) and a positive pressure flow testing device (0132) that are connected to each other.

6. A gas turbine compressor internal air salt content testing system, characterized in that: The device comprises the gas turbine compressor internal air salt content testing device according to any one of claims 1 to 5.

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