An equivalent throttling device and a method for measuring a reference value of a fuel nozzle flow rate

Abstract

The present invention provides an equivalent throttling device and a method for measuring a reference flow value of a fuel nozzle, comprising: a throttling orifice plate, a quick male connector, a dovetail groove base and a mounting base; the throttling orifice plate is processed with a preset number of throttling holes of a preset diameter; an internal thread of a preset depth is coaxially processed on the basis of each throttling hole, the internal thread is matched and connected with the quick male connector to form a main measurement module, and the quick male connector is connected with the throttling hole; a trapezoidal guide rail is provided at one end of the throttling orifice plate; the central axis of the dovetail groove base is a symmetric axis and a dovetail groove is provided; the throttling orifice plate is matched and connected with the dovetail groove base; the dovetail groove base is connected with the mounting base. The present invention greatly simplifies the measurement of the reference flow value of the fuel nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of detection technology for aeroderivative gas turbine equipment, and in particular, to a method for measuring an equivalent throttling device and a fuel nozzle flow reference value, and more particularly, to a method for measuring the flow reference value of an aeroderivative gas turbine fuel nozzle using an equivalent throttling device. Background Art

[0002] Numerous fuel nozzles are arranged in a ring within the combustion chamber of an aeroderivative gas turbine. During operation, these nozzles continuously supply fuel to the combustion chamber, where it is thoroughly mixed with compressed air from the compressor. The resulting mixture then burns within the combustion chamber. However, impurities in the fuel or compressed air can accumulate in the fuel nozzles over time, causing blockage within the flow path and impacting combustion chamber performance.

[0003] When there is a large dispersion among the temperature sensors arranged in a ring outside the combustion chamber, it indicates that the fuel nozzle has been clogged. At this time, the engine needs to be shut down and a special flow test device is used to measure the flow of each fuel nozzle that is clogged. The measured actual flow value is compared with the flow reference value to screen out the fuel nozzles that are clogged beyond the standard. The reference value refers to the lower limit of the flow rate that can still be used after the fuel nozzle is clogged. Therefore, it is particularly important to accurately establish this reference value. However, the gas medium used in the system for testing this reference value has the characteristics of changing with environmental conditions such as temperature and pressure, which determines that the reference value must be determined under the local environment of the test site.

[0004] The existing technology is to take 90% of the average flow rate value of several new fuel nozzle groups to establish the reference value. The so-called new fuel nozzle refers to a nozzle that has not been used and has no blockage. The specific method is: one nozzle of the selected N new fuel nozzle groups is connected to the following Figure 1 At the end of the test system shown, the test system is operated to obtain a flow value for each test, with a total of N values, and 90% of the average value is taken as the benchmark value. The main problems of the existing technology are: 1) It is based on N new fuel nozzles, but due to factors such as the high price, large size and weight of fuel nozzles, they are often not available during testing; 2) It is necessary to install and remove new fuel nozzles N times, but the steps of each installation and testing are cumbersome, resulting in a high manpower and time consumption of the entire process; 3) The accuracy is not high enough, which depends on the number of selected fuel nozzles. The larger N is, the more accurate it is. Now, with more and more aero-derivative gas turbine generator sets being put into operation in the domestic market, the demand for fuel nozzle blockage testing is increasing. Therefore, developing a simple device and a convenient method to quickly and accurately obtain the benchmark value is of great significance to the entire testing work.

[0005] Patent document CN108731924A (application number: 201810315866.X) A gas turbine nozzle flow rate test system and test method based on the Laval nozzle principle. At present, the measurement of the gas turbine nozzle flow rate requires the nozzle to be removed for inspection, which is time-consuming and cumbersome to operate. The present invention uses a replaceable Laval nozzle as a throttling element. By replacing the Laval nozzle, different flow rates can be obtained to correspond to different types of combustion nozzles, which are used to measure the flow uniformity of the nozzle of the heavy-duty gas turbine combustion chamber, and then determine whether the nozzle is blocked. The present invention only describes a system and method for measuring the true flow value of the fuel nozzle using a Laval nozzle as the main gas flow measurement element, and does not introduce its flow reference value measurement method from the perspective of determining whether the fuel nozzle is blocked beyond the standard. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide an equivalent throttling device and a test method for a fuel nozzle flow reference value.

[0007] According to the present invention, an equivalent throttling device is provided, comprising: a throttling orifice plate, a quick male connector, a dovetail groove base and a mounting base;

[0008] The throttle orifice plate is processed with a preset number of throttle holes of a preset diameter; an internal thread of a preset depth is coaxially processed on the basis of each throttle hole, and the internal thread is connected with the quick male connector to form a main measurement module, and the quick male connector is connected to the throttle hole;

[0009] The throttle orifice plate is detachably connected to the dovetail groove base;

[0010] The dovetail groove base is connected to the mounting base.

[0011] Preferably, the inner hole diameter of the quick male connector is larger than the throttling hole diameter of the throttling orifice plate.

[0012] Preferably, a trapezoidal guide rail is provided at one end of the throttling orifice plate; the dovetail groove base is provided with a dovetail groove with the central axis as the axis of symmetry; the trapezoidal guide rail of the throttling orifice plate is cooperatively connected with the dovetail groove base.

[0013] Preferably, through holes are provided on both sides of the dovetail groove base, which is connected to the mounting base by bolts.

[0014] Preferably, the mounting base is provided with a preset through hole, and the mounting base is provided with a stepped hole with the central axis of the mounting base as the symmetry axis, and the stepped hole of the mounting base is used to install a stepped axial magnet that matches it;

[0015] The mounting base fixes the equivalent throttling device via through holes and / or magnets.

[0016] Preferably, each throttle hole on the throttle orifice plate corresponds to each specification flow channel of the fuel nozzle in the combustion engine, and the flow capacity of the throttle hole is equivalent to the average value of the flow capacity of the fuel nozzle.

[0017] Preferably, the equivalent throttling device is made of stainless steel.

[0018] Preferably, the equivalent throttling device is installed horizontally, and the throttling hole is set along the upper end of the throttling hole plate and directly connected to the atmosphere to reduce the influence of surrounding obstacles on measurement accuracy.

[0019] According to a method for measuring a fuel nozzle flow reference value provided by the present invention, the equivalent throttling device described above is used to perform the following steps:

[0020] Step M1: Use the inlet quick hose and outlet quick hose to connect the test gas cylinder group, gas filter, dedicated gas flow measurement device and equivalent throttling device;

[0021] Step M2: Open the test gas cylinder assembly, operate the dedicated gas flow measurement device, connect the outlet quick hose to the first quick male connector, measure the flow value of the fuel nozzle air channel A and record the current air channel flow reference value;

[0022] Step M3: Connect the outlet quick hose to the second quick male connector, measure the flow rate of the fuel nozzle air channel B, and record it as the flow rate reference value of the air channel;

[0023] Step M4: Connect the outlet quick hose to the third quick male connector, measure the flow rate of the fuel nozzle air channel C, and record it as the flow rate reference value of the air channel;

[0024] Step M5: Turn off the gas cylinder group and the dedicated gas flow measurement device, and remove the equivalent throttling device.

[0025] Preferably, step M1 includes: the mounting base in the equivalent throttling device is fixed on a horizontal plane of the test field of view, the quick male connector faces the dedicated gas flow measurement device, the outlet quick hose is connected to the quick male connector, and the throttling hole is directly connected to the atmosphere.

[0026] Preferably, the main measurement module can be replaced by the matching dovetail grooves of the throttle orifice plate and the dovetail groove base to meet the measurement requirements of fuel nozzles of different specifications.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention eliminates the limitation of the testing work on the supply of new fuel nozzle groups, ensuring that the work can be carried out smoothly;

[0029] 2. The present invention utilizes the equivalent characteristics and can obtain the benchmark value in one test after connecting to the flow test system, which greatly reduces the workload;

[0030] 3. The present invention is based on the equivalence of the throttle hole and the 30 new fuel nozzle groups during design, and the measured reference value is more accurate;

[0031] 4. The equivalent throttling device of the present invention has a simple structure, is light in weight, and is easy to carry. It also provides two installation methods, which can be flexibly selected according to the workbench at the test site;

[0032] 5. The specifications of the throttle orifice plate of the present invention correspond to the specifications of the fuel nozzle and can be quickly replaced to meet the testing requirements of fuel nozzles of different specifications.

[0033] 6. The present invention utilizes the equivalent throttling device to replace several required new fuel nozzle groups, thereby obtaining the flow reference value simply and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0035] Figure 1 A test system for flow rate benchmark values ​​of aeroderivative gas turbine fuel nozzles;

[0036] Figure 2 A connection diagram of a test device used in the prior art;

[0037] Figure 3 It is an axonometric view of an equivalent throttling device;

[0038] Figure 4 It is a cross-sectional view of the equivalent throttling device. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0040] An equivalent throttling device is connected to the flow reference value measurement system of the fuel nozzle of an aeroderivative gas engine by replacing the fuel nozzle, so that the flow reference value of the fuel nozzle can be measured quickly and accurately at one time. The present invention utilizes the characteristic that the equivalent throttling device is equivalent to 90% of the average flow capacity of 30 (the total number of each gas engine) new fuel nozzle groups. The throttling device is connected to the flow reference value measurement system of the fuel nozzle of an aeroderivative gas engine by replacing the fuel nozzle. Figure 1The equivalent characteristic refers to the flow rate value A obtained when the throttling device is connected during testing using the flow rate testing system, and the average value B of 30 flow rate values ​​measured when a new fuel nozzle is connected is taken, and A = 0.9B.

[0041] Example 1

[0042] According to the present invention, an equivalent throttling device is provided, comprising: a throttling orifice plate 71, a quick male connector 72, a dovetail groove base 73 and a mounting base 74;

[0043] The throttle orifice plate 71 is processed with three throttle holes 711 with very small diameters; an internal thread of a certain depth is coaxially processed on the basis of each throttle hole 711, and the internal thread is connected with the quick male connector 72 to form a main measurement module, and the quick male connector 72 is connected to the throttle hole 711;

[0044] The throttle orifice plate 71 is detachably connected to the dovetail groove base 73;

[0045] The dovetail groove base 73 is connected to the mounting base 74 .

[0046] Specifically, the inner diameter of the quick male connector 72 is larger than the diameter of the throttle hole 711 of the throttle orifice plate 71. The quick male connector 72 is a standard part;

[0047] Specifically, a trapezoidal guide rail is provided at one end of the throttling orifice plate 71; the dovetail groove base 73 is provided with a dovetail groove with the central axis as the symmetry axis; the trapezoidal guide rail of the throttling orifice plate 71 is cooperatively connected with the dovetail groove base 73, so that the throttling orifice plate 71 can be quickly installed and replaced.

[0048] Specifically, through holes are provided on both sides of the dovetail groove base 73 and are connected to the mounting base 74 via mounting bolts 75 .

[0049] Specifically, the mounting base 74 is provided with a preset through hole 741, and the mounting base 74 is provided with a stepped hole with the central axis of the mounting base 74 as the symmetry axis. The stepped hole of the mounting base 74 is used to install the stepped axial magnet 76 that matches it.

[0050] The mounting base 74 is connected by bolts through the through holes 741 and / or the magnet 76 fixes the equivalent throttling device, thereby enabling convenient installation of the equivalent throttling device.

[0051] The throttling device can quickly connect or disconnect the flow reference value measurement system of the aeroderivative gas turbine fuel nozzle through the quick male connector 72, so that the flow reference value of the fuel nozzle can be measured at one time, the measurement is faster and more convenient, and rapid switching between different airways to be tested can be achieved.

[0052] Each small throttle hole 711 on the throttle orifice plate 71 corresponds to a specific flow channel size in each fuel nozzle. The flow capacity of each throttle hole 711 is equivalent to the average flow capacity of a complete set of new fuel nozzles in each gas engine. This design makes the measurement of fuel nozzle flow rate reference values ​​more reasonable and accurate. Specifically, each small throttle hole 711 on the throttle orifice plate 71 is equivalent to 90% of the average flow capacity of the corresponding air channels of 30 fuel nozzle groups. When connected to a flow test system, the reference value can be measured in one go, with greater accuracy.

[0053] Specifically, each throttle hole 711 on the throttle orifice plate 71 corresponds to each specification flow channel of the fuel nozzle in the combustion engine, and the flow capacity of the throttle hole 711 is equivalent to the average value of the flow capacity of the fuel nozzle.

[0054] The throttle orifice plate 71 is equipped with three throttle holes 711 of different apertures, which just correspond to the three gas passages to be tested of the fuel nozzle. Each throttle orifice plate 71 corresponds to a fuel nozzle of a certain specification, which is convenient for identification.

[0055] Specifically, the equivalent throttling device is made of stainless steel to prevent the throttling hole 711 from being corroded and affecting the test accuracy due to changes in aperture. The throttling hole 711 is designed to be close to the upper part of the throttling hole plate 71 to reduce the impact of surrounding obstacles on measurement accuracy.

[0056] Specifically, the equivalent throttling device is installed horizontally, and the throttling hole 711 is provided along the upper end of the throttling hole plate 71 and directly communicates with the atmosphere, thereby reducing the influence of surrounding obstacles on the measurement accuracy.

[0057] According to a method for measuring a fuel nozzle flow reference value provided by the present invention, the equivalent throttling device described above is used to perform the following steps:

[0058] Step M1: Use the inlet quick hose 3 and the outlet quick hose 5 to connect the test gas cylinder group 1, the gas filter 2, the dedicated gas flow measurement device 4 and the equivalent throttling device 7;

[0059] Step M2: Open the test gas cylinder set 1, operate the dedicated gas flow measurement device 4, connect the outlet quick hose 5 to the first quick male connector 72, measure the flow value of the fuel nozzle air channel A and record the current air channel flow reference value;

[0060] Step M3: Connect the outlet quick hose 5 to the second quick male connector 72, measure the flow rate value of the fuel nozzle air channel B and record it as the flow rate reference value of the air channel;

[0061] Step M4: Connect the outlet quick hose 5 to the third quick male connector 72, measure the flow rate of the fuel nozzle air channel C and record it as the flow rate reference value of the air channel;

[0062] Step M5: Close the gas cylinder group 1 and the dedicated gas flow measurement device 4, and remove the equivalent throttling device.

[0063] Specifically, step M1 includes: the mounting base 74 in the equivalent throttling device is fixed on the horizontal plane of the test field, the quick male connector 72 faces the dedicated gas flow measurement device 4, the outlet quick hose 5 is connected to the quick male connector 72, and the throttling hole 711 is directly connected to the atmosphere.

[0064] Specifically, the main measurement module can be replaced by the matching dovetail grooves of the throttle orifice plate 71 and the dovetail groove base 73 to meet the measurement requirements of fuel nozzles of different specifications.

[0065] Example 2

[0066] Example 2 is a variation of Example 1

[0067] like Figure 1 As shown, the flow rate reference value measurement system of the aeroderivative gas turbine fuel nozzle mainly includes: a test gas cylinder group 1, a gas filter 2, an air inlet quick hose 3, a special gas flow measurement device 4, an outlet quick hose 5 and an existing measurement device 6.

[0068] like Figure 2 As shown, Figure 1 The connection diagram of the existing measuring device 6 mainly includes: an outlet quick hose 5, a quick male connector, a connecting plate 62, a sealing gasket 63, a new unused fuel nozzle 64 and several mounting bolts.

[0069] The measurement steps of the prior art are as follows:

[0070] S1. Prepare several new unused fuel nozzles 64 in advance;

[0071] S2. According to Figure 1 and Figure 2 Complete the connection of the measurement system;

[0072] S3. Open the gas cylinder group 1, operate the dedicated gas flow measurement device 4, and record the flow value of the A circuit in the first fuel nozzle 64;

[0073] S4. Connect the outlet quick hose 5 to the quick male connector 61 of the B circuit in the first fuel nozzle 64, measure the flow rate and record it;

[0074] S5. Connect the outlet quick hose 5 to the quick male connector 61 of the C circuit in the first fuel nozzle 64, measure the flow rate and record it;

[0075] S6. Close the gas cylinder group 1 and the dedicated gas flow measurement device 4, remove the mounting bolts of the fuel nozzle 64, and install the second fuel nozzle;

[0076] S7, repeating steps S2-S5 until the flow rate measurement of all fuel nozzles is completed;

[0077] S8, close the gas cylinder group 1 and the dedicated gas flow measurement device 4, and remove the fuel nozzle 64;

[0078] S9. Take the average of the flow values ​​measured in circuits A, B and C respectively, record them as QA average, QB average and QC average, and use them as the flow reference values ​​of the corresponding circuits.

[0079] like Figure 3 and Figure 4 The figure shows an isometric and cross-sectional view of the equivalent throttling device of the present invention, which primarily comprises: a throttling orifice plate 71, a quick male connector 72, a dovetail base 73, a mounting base 74, mounting bolts 75, and a magnet 76. During assembly, a small amount of thread sealant should be applied to the external threads of the three quick male connectors 72 to prevent air leakage from these connections during testing, which could affect test accuracy. Once screwed onto the corresponding internal threads of the throttling orifice plate 71, the entire assembly serves as the main measurement module, with the remaining components providing support and mounting for it.

[0080] The throttle hole 711 on the throttle orifice plate 71 is equivalent to the average flow capacity of the complete set of new fuel nozzles included in each gas turbine. The inner hole of the quick male connector 72 is larger than the throttle hole 711. From right to left, each quick male connector 72 corresponds to the circuits A, B, and C of the fuel nozzle 64. The mounting base 74 provides two installation methods: adsorption by magnet 76 or connection to the test site through hole 741. The magnet 76 is a stepped shaft type, which is clearance-matched with the stepped hole set in the mounting base 74. After installation, the magnet 76 is allowed to have a slight axial displacement along the stepped hole to protect the magnet. The mounting bolt 75 is used to connect the dovetail base 73 and the mounting base 74, so that the magnet 76 is encapsulated in the mounting base 74.

[0081] During use, mounting base 74 is secured to a horizontal surface at the test site, with quick male connector 72 facing the dedicated gas flow measurement device 4. The outlet quick hose 5 is connected to quick male connector 72, leaving orifice 711 vented directly to the open atmosphere. The mating dovetail grooves of orifice plate 71 and dovetail base 73 allow for easy replacement of the main measurement module, meeting the measurement needs of fuel nozzles of varying specifications.

[0082] The equivalent throttling device mentioned above is connected to the existing measuring device 6 instead of the existing measuring device 6. Figure 1 In the measurement system shown, the flow rate reference value of the fuel nozzle can be quickly obtained. The specific operation steps are as follows:

[0083] S1. According to Figure 1 Complete the connection of the measurement system;

[0084] S2. Open the gas cylinder group 1 and operate the dedicated gas flow measuring device 4 to measure the flow value of loop A and record it as the flow reference value of the loop;

[0085] S3. Connect the outlet quick hose 5 to the second quick male connector 72, measure the flow rate of loop B and record it as the flow rate reference value of the loop;

[0086] S4. Connect the outlet quick hose 5 to the third quick male connector 72, measure the flow rate of loop C and record it as the flow rate reference value of the loop;

[0087] S5. Close the gas cylinder group 1 and the dedicated gas flow measurement device 4, and disassemble the equivalent throttling device.

[0088] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0089] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. An equivalent throttling device, characterized in that: include: Orifice plates, quick-release nipples, dovetail bases, and mounting bases; The throttle hole is processed on the throttle hole plate; an internal thread is coaxially processed on the basis of each throttle hole, and the internal thread is matched and connected with the quick male connector to form a main measurement module, and the quick male connector is connected with the throttle hole; The throttle orifice plate is detachably connected to the dovetail groove base; The dovetail base is connected to the mounting base; The inner diameter of the quick male connector is larger than the diameter of the throttle hole of the throttle orifice plate; the quick male connector can quickly connect or disconnect the flow reference value measurement system of the fuel nozzle of the combustion engine; Each throttle hole on the throttle orifice plate corresponds to each specification flow channel of the fuel nozzle in the combustion engine, and the flow capacity of the throttle hole is equivalent to the average value of the flow capacity of the fuel nozzle.

2. The equivalent throttling device according to claim 1, characterized in that: A trapezoidal guide rail is provided at one end of the throttling orifice plate; a dovetail groove base is provided with a dovetail groove with the central axis as the symmetry axis; and the trapezoidal guide rail of the throttling orifice plate is cooperatively connected with the dovetail groove base.

3. The equivalent throttling device according to claim 1, characterized in that: The mounting base is provided with a through hole, and the mounting base is provided with a stepped hole with the central axis of the mounting base as the symmetry axis, and the stepped hole of the mounting base is used to install a stepped axial magnet that matches it; The mounting base fixes the equivalent throttling device by means of through-hole bolts and / or magnets.

4. The equivalent throttling device according to claim 1, characterized in that: The equivalent throttling device is made of stainless steel.

5. The equivalent throttling device according to claim 1, characterized in that: The equivalent throttling device is installed horizontally, and the throttling hole is arranged along the upper end of the throttling hole plate and directly leads to the atmosphere, thereby reducing the influence of surrounding obstacles on the measurement accuracy.

6. A method for measuring a fuel nozzle flow rate reference value, characterized in that: Using the equivalent throttling device described in any one of claims 1 to 5, perform the following steps: Step M1: Use the inlet quick hose and the outlet quick hose to connect the test gas cylinder group, the gas filter, the special gas flow measurement device and the equivalent throttling device; Step M2: Open the test gas cylinder group, operate the dedicated gas flow measurement device, connect the outlet quick hose to the first quick male connector, measure the flow value of the fuel nozzle gas channel A and record the current gas channel flow reference value; Step M3: Connect the outlet quick hose to the second quick male connector, measure the flow value of the fuel nozzle air passage B and record it as the flow reference value of the air passage; Step M4: Connect the outlet quick hose to the third quick male connector, measure the flow value of the fuel nozzle air channel C and record it as the flow reference value of the air channel; Step M5: Turn off the test gas cylinder group and the dedicated gas flow measurement device, and disassemble the equivalent throttling device.

7. The method for measuring a fuel nozzle flow rate reference value according to claim 6, characterized in that: The step M1 comprises: the mounting base in the equivalent throttling device is fixed on a horizontal plane of the test field of view, the quick male connector faces the dedicated gas flow measurement device, the outlet quick hose is connected to the quick male connector, and the throttling hole is directly connected to the atmosphere.

8. The method for measuring a fuel nozzle flow rate reference value according to claim 6, characterized in that: The main measurement module can be replaced by the matching dovetail grooves of the throttling orifice plate and the dovetail groove base to meet the measurement requirements of fuel nozzles of different specifications.

Images