A fuel inlet leakage test device and test method for a combustion engine based on pressure correction

Abstract

The present invention relates to a fuel inlet leakage test device and test method for a gas turbine based on pressure correction, and belongs to the field of detection and automation devices. In the present invention, a natural gas inlet is connected to a natural gas booster, a natural gas booster is connected to a natural gas front module through a No. 2 natural gas transmission pipeline, a booster outlet flow meter is installed on the No. 2 natural gas transmission pipeline, a natural gas front module is connected to a manual valve through a No. 3 natural gas transmission pipeline, a heater is installed on the No. 3 natural gas transmission pipeline, a heater is connected to a signal transmission module through a signal line, a manual valve is connected to a natural gas intake solenoid valve, a natural gas intake solenoid valve is connected to a No. 1 control solenoid valve through a No. 1 pressure test pipeline, a gas turbine intake flow sensor is installed on a No. 1 pressure test pipeline, a No. 1 control solenoid valve is connected to a No. 3 control solenoid valve through a No. 2 pressure test pipeline, and a No. 3 control solenoid valve is connected to a gas turbine.

Description

Technical Field

[0001] The invention relates to a fuel inlet leakage test device and a test method for a combustion engine based on pressure correction, and belongs to the field of detection and automation devices. Background Art

[0002] In the face of increasingly serious problems such as climate warming and environmental degradation, advocating energy conservation and emission reduction has become a new trend. Natural gas as a clean energy has attracted much attention. In the power industry, distributed energy stations using natural gas as fuel and gas turbines as the main power system have been promoted and applied. In order to ensure the safe use of natural gas and the stable operation of gas turbines, the air tightness of the natural gas transmission process must strictly meet the requirements. The natural gas intake part of the gas turbine is located in the gas turbine cabin. If natural gas leaks in this part, it will cause gas turbine tripping due to unstable fuel supply pressure difference, and fire and explosion caused by high natural gas concentration in the gas turbine cabin. Therefore, natural gas leakage detection before starting is crucial for the normal operation of the gas turbine.

[0003] Commonly used gas leak detection methods generally use direct measurement methods using pressure sensors, but the natural gas supply of gas turbines is generally controlled by multi-stage valves. The opening and closing states of the control valves divide the inflation, pressure stabilization and exhaust processes. The pressure stabilization process is the change from uneven to uniform after the gas loses its dynamic pressure. The pressure change is nonlinear, which makes the method of using pressure testing as a criterion for leak detection complicated. Therefore, a more comprehensive quantitative analysis of the test pressure in the pipeline is required to solve the problem of gas leak detection. In addition, the operating compartment of the gas turbine is a closed space, which also requires that the measurement of its gas leak detection be integrated. Therefore, it is necessary to design a device and method to solve the problem of natural gas inlet leakage detection before the gas turbine is started. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a fuel inlet leakage test device and a test method for a gas turbine based on pressure correction which has a reasonable structural design, a perfect system and can solve the problem of leakage detection of the natural gas intake part before ignition of the gas turbine.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: the fuel inlet leakage test device of the gas turbine based on pressure correction includes a natural gas inlet, a natural gas booster, a booster outlet flow meter, a natural gas front module, a heater, a manual valve, a natural gas inlet solenoid valve, a No. 1 pressure test pipeline, a gas turbine intake flow sensor, a No. 1 control solenoid valve, an air pipeline, a No. 2 control solenoid valve, a No. 2 pressure test pipeline, a No. 3 control solenoid valve, a signal transmission module, a gas turbine and a data terminal. Its structural characteristics are: the natural gas inlet is connected to the natural gas booster, the natural gas booster is connected to the natural gas front module through the No. 2 natural gas transmission pipeline, the booster outlet flow meter is installed on the No. 2 natural gas transmission pipeline, and the natural gas front module is connected to the manual valve through the No. 3 natural gas transmission pipeline. The heater is installed on the No. 3 natural gas transmission pipeline, the heater is connected to the signal transmission module through a signal line, the manual valve is connected to the natural gas intake solenoid valve, the natural gas intake solenoid valve is connected to the No. 1 control solenoid valve through the No. 1 pressure test pipeline, the gas turbine intake flow sensor is installed on the No. 1 pressure test pipeline, the No. 1 control solenoid valve is connected to the No. 3 control solenoid valve through the No. 2 pressure test pipeline, the No. 3 control solenoid valve is connected to the gas turbine, one end of the air pipeline is connected to the No. 2 pressure test pipeline, and the other end of the air pipeline is connected to the No. 2 control solenoid valve, the gas turbine intake flow sensor, the No. 1 control solenoid valve, the No. 2 control solenoid valve and the No. 3 control solenoid valve are all connected to the signal transmission module through a signal line, and the signal transmission module is connected to the data terminal through a signal line.

[0006] Furthermore, the fuel turbine fuel inlet leakage test device also includes a No. 1 natural gas transmission pipeline, an ESD valve, a booster motor, a booster outlet solenoid valve, a density sensor and a natural gas supply pipeline. The natural gas inlet is connected to the natural gas booster through the No. 1 natural gas transmission pipeline, the ESD valve is installed on the No. 1 natural gas transmission pipeline, the booster motor is connected to the natural gas booster, the booster outlet solenoid valve is installed on the No. 2 natural gas transmission pipeline, the density sensor is installed in the No. 2 pressure test pipeline, the density sensor is connected to the signal transmission module through a signal line, and the No. 3 control solenoid valve is connected to the combustion chamber of the gas turbine through the natural gas supply pipeline.

[0007] Furthermore, the fuel engine fuel inlet leakage test device also includes a front module natural gas density meter, a No. 1 safety valve, a No. 2 safety valve, a front module natural gas pressure gauge, a front module natural gas thermometer, a No. 1 pressure sensor, a No. 1 temperature sensor, a No. 2 pressure sensor and a No. 2 temperature sensor. The front module natural gas density meter, the No. 1 safety valve and the No. 2 safety valve are all connected to the natural gas front module through a pipeline, the front module natural gas pressure gauge is integrated with the front module natural gas thermometer and is connected to the natural gas front module through a signal line, the No. 1 pressure sensor is integrated with the No. 1 temperature sensor, the No. 1 pressure sensor and the No. 1 temperature sensor are both installed in the No. 1 pressure test pipeline, the No. 1 pressure sensor and the No. 1 temperature sensor are both connected to the signal transmission module, the No. 2 pressure sensor is integrated with the No. 2 temperature sensor, the No. 2 pressure sensor and the No. 2 temperature sensor are both installed in the No. 2 pressure test pipeline, and the No. 2 pressure sensor and the No. 2 temperature sensor are both connected to the signal transmission module.

[0008] Furthermore, the natural gas front module includes a No. 1 natural gas filter storage tank and a No. 2 natural gas filter storage tank.

[0009] Furthermore, the gas turbine includes a combustion chamber of the gas turbine, an air compressor and a power turbine, and the No. 3 control solenoid valve is connected to the combustion chamber of the gas turbine.

[0010] Furthermore, another technical purpose of the present invention is to provide a testing method for a fuel inlet leakage testing device of a combustion engine based on pressure correction.

[0011] The above technical objectives of the present invention are achieved through the following technical solutions.

[0012] A test method for a fuel inlet leakage test device for a combustion engine based on pressure correction, wherein the test method comprises the following steps:

[0013] Step 1: Before the test begins, ensure that natural gas has been replaced between the natural gas inlet and the manual valve, and ensure that the ESD valve, the booster outlet solenoid valve, the manual valve, the natural gas inlet solenoid valve, the No. 1 control solenoid valve and the No. 3 control solenoid valve are closed, and the No. 2 control solenoid valve is open;

[0014] Step 2: Open the ESD valve and the booster outlet solenoid valve, and start the natural gas booster, check whether the natural gas pressure gauge and natural gas temperature gauge of the front module meet the ignition start-up conditions of the gas turbine, and switch the manual valve to the open position;

[0015] Step 3: Parameter setting, set the opening and closing time interval t of the No. 1 control solenoid valve a , the time interval between closing and opening of the No. 2 control solenoid valve t b, set the pressure comparison constant C;

[0016] Step 4: Data acquisition. Open the natural gas inlet solenoid valve. The pressure of the first pressure sensor stabilizes at the pressure value P0 of the natural gas pressure gauge in the front-end module. The natural gas density meter in the front-end module measures the natural gas density ρ value. Close the second control solenoid valve, and at the same time open the first control solenoid valve. The data terminal starts timing from this moment as the initial 0s. The gas turbine inlet flow sensor collects the flow rate Q1. At time t b At time t1, close the first control solenoid valve, and the gas turbine inlet flow sensor measures the flow rate Q2. c At time t-1, the second pressure sensor measures the pressure P. b , the second temperature sensor measures the temperature T. At time t c At time t2, open the second control solenoid valve;

[0017] Step 5: Data processing. Calculate the corrected gas pressure in the following way:

[0018] According to P×V = n×R×T

[0019] where P is the pressure to be obtained, V is the volume of the test section pipeline, n is the amount of gas, R is the universal gas constant, and T is the gas temperature;

[0020] The calculation method of the amount of gas n is: n = m / M

[0021] where m is the mass of the gas in the test section pipeline, and M is the molar mass of the gas;

[0022] The gas mass m can be measured by the following method: m = ρ×Q×t a

[0023] where ρ is the density of the gas flowing into the test pipeline, and its value is the natural gas density ρ value in Step 4. Q is the gas flow rate flowing into the test pipeline, Q = (Q1 + Q2) / 2, and t a is the time for the gas to flow into the pipeline;

[0024] Obtain: P = ρ×(Q1 + Q2)×t a ×R×T / (M×V);

[0025] Step 6: Calculation and judgment. According to the pressure P obtained in Step 5, the second pressure sensor measures the pressure P b , the method is as follows:

[0026] If P - P b < C condition is satisfied, it is determined that the pressure in the test pipeline is normal, the airtightness of the valve and the pipeline passes the test, and the starting requirements of the gas turbine are met;

[0027] If P - P b>If condition C is met, it is determined that the pressure in the test pipeline is abnormal, and the air tightness of the valve and pipeline fails the test, which means that the start-up requirements of the gas turbine are not met.

[0028] Furthermore, the testing method further comprises a step seven after step six:

[0029] Step 7: Heating. If the gas temperature is low or fluctuates greatly, use a heater to heat the gas in the pipeline and set the required natural gas inlet temperature T. The PID controller controls the heater to heat the natural gas according to the set temperature T, thereby ensuring the stability of the inlet temperature. When this step is implemented, the temperature T in step five is the temperature T set by the PID controller.

[0030] Further, step three: t a The range is 5-10s, t b The range is 10-20s and the C range is 0-50psig.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] Experiments have shown that: taking a section of an intake pipe with a closed end as an example, when the intake valve is switched from open to closed to end the intake process, the pressure in the closed pipe will decrease. This is because after losing the dynamic pressure, the gas movement tends to a steady state, and the pressure at the measuring point in the pipe decreases and gradually becomes equal to the static pressure of the gas.

[0033] If after the intake valve is closed, the pressure difference before and after the intake valve is used as the leakage judgment criterion, the influence of factors such as gas flow rate will be ignored, and incorrect judgment will be made when the flow rate is low. By using the flow measurement method and quantitatively calculating the corresponding test pressure, the adverse effect of nonlinear changes in the pressure stabilization process on leakage judgment can be avoided. At the same time, the temperature variable is introduced in the measurement change to make the pressure measurement value more adaptable.

[0034] The above two aspects make the general fixed pressure criterion into a dynamic value, making leak detection more flexible and reliable. The addition of a PID-controlled natural gas heater, combined with the temperature variable in the pressure measurement, enhances the judgment resistance of leak detection in cold extreme environments. In addition, the leak test corrected before startup can also verify whether the key valves are in place during the startup process, providing protection for the startup and normal operation of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the connection relationship of a fuel inlet leakage test device for a combustion engine according to an embodiment of the present invention.

[0036] In the figure: natural gas inlet 1, No. 1 natural gas transmission pipeline 2, ESD valve 3, natural gas booster 4, booster motor 5, No. 2 natural gas transmission pipeline 6, booster outlet solenoid valve 7, booster outlet flow meter 8, natural gas front module 9, front module natural gas density meter 10, No. 1 safety valve 11, No. 2 safety valve 12, No. 1 natural gas filter storage tank 13, No. 2 natural gas filter storage tank 14, front module natural gas pressure gauge 15, front module natural gas thermometer 16, heater 17, No. 3 natural gas transmission pipeline 18, manual valve 19. Natural gas intake solenoid valve 20. No. 1 pressure test pipeline 21. No. 1 pressure sensor 22. No. 1 temperature sensor 23. Gas turbine intake flow sensor 24. No. 1 control solenoid valve 25. Air pipeline 26. No. 2 control solenoid valve 27. No. 2 pressure sensor 28. No. 2 temperature sensor 29. No. 2 pressure test pipeline 30. Density sensor 31. No. 3 control solenoid valve 32. Signal transmission module 33. Natural gas supply pipeline 34. Gas turbine combustion chamber 35. Air compressor 36. Power turbine 37. Gas turbine 38. Data terminal 39. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0038] Example

[0039] See also Figure 1 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0040] The fuel inlet leakage test device of the gas turbine based on pressure correction in this embodiment includes a natural gas inlet 1, a No. 1 natural gas transmission pipeline 2, an ESD valve 3, a natural gas booster 4, a booster motor 5, a No. 2 natural gas transmission pipeline 6, a booster outlet solenoid valve 7, a booster outlet flow meter 8, a natural gas front module 9, a front module natural gas density meter 10, a No. 1 safety valve 11, a No. 2 safety valve 12, a front module natural gas pressure gauge 15, a front module natural gas thermometer 16, a heater 17, and a No. 3 natural gas Delivery pipeline 18, manual valve 19, natural gas intake solenoid valve 20, No. 1 pressure test pipeline 21, No. 1 pressure sensor 22, No. 1 temperature sensor 23, gas turbine intake flow sensor 24, No. 1 control solenoid valve 25, air pipeline 26, No. 2 control solenoid valve 27, No. 2 pressure sensor 28, No. 2 temperature sensor 29, No. 2 pressure test pipeline 30, density sensor 31, No. 3 control solenoid valve 32, signal transmission module 33, natural gas supply pipeline 34, gas turbine 38 and data terminal 39.

[0041] In this embodiment, the natural gas inlet 1 is connected to the natural gas booster 4, the natural gas booster 4 is connected to the natural gas front module 9 through the No. 2 natural gas transmission pipeline 6, the booster outlet flow meter 8 is installed on the No. 2 natural gas transmission pipeline 6, the natural gas front module 9 is connected to the manual valve 19 through the No. 3 natural gas transmission pipeline 18, the heater 17 is installed on the No. 3 natural gas transmission pipeline 18, the heater 17 is connected to the signal transmission module 33 through a signal line, the manual valve 19 is connected to the natural gas intake solenoid valve 20, the natural gas intake solenoid valve 20 is connected to the No. 1 control solenoid valve 25 through the No. 1 pressure test pipeline 21, The gas turbine intake air flow sensor 24 is installed on the No. 1 pressure test pipe 21, the No. 1 control solenoid valve 25 is connected to the No. 3 control solenoid valve 32 through the No. 2 pressure test pipe 30, the No. 3 control solenoid valve 32 is connected to the gas turbine 38, one end of the air pipe 26 is connected to the No. 2 pressure test pipe 30, and the other end of the air pipe 26 is connected to the No. 2 control solenoid valve 27, the gas turbine intake air flow sensor 24, the No. 1 control solenoid valve 25, the No. 2 control solenoid valve 27 and the No. 3 control solenoid valve 32 are all connected to the signal transmission module 33 through a signal line, and the signal transmission module 33 is connected to the data terminal 39 through a signal line.

[0042] The natural gas inlet 1 in this embodiment is connected to the natural gas booster 4 through the No. 1 natural gas transmission pipeline 2, the ESD valve 3 is installed on the No. 1 natural gas transmission pipeline 2, the booster motor 5 is connected to the natural gas booster 4, the natural gas booster 4 is connected to the booster outlet flow meter 8 through the No. 2 natural gas transmission pipeline 6, the booster outlet solenoid valve 7 is installed on the No. 2 natural gas transmission pipeline 6, the density sensor 31 is installed in the No. 2 pressure test pipeline 30, the density sensor 31 is connected to the signal transmission module 33, and the No. 3 control solenoid valve 32 is connected to the combustion chamber 35 of the gas turbine through the natural gas supply pipeline 34.

[0043] In this embodiment, the front module natural gas density meter 10, the No. 1 safety valve 11 and the No. 2 safety valve 12 are all connected to the natural gas front module 9 through a pipeline, the front module natural gas pressure gauge 15 is integrated with the front module natural gas thermometer 16, and is connected to the natural gas front module 9 through a signal line, the No. 1 pressure sensor 22 is integrated with the No. 1 temperature sensor 23, and the No. 1 pressure sensor 22 and the No. 1 temperature sensor 23 are both installed in the No. 1 pressure test pipeline 21, and the No. 1 pressure sensor 22 and the No. 1 temperature sensor 23 are both connected to the signal transmission module 33, the No. 2 pressure sensor 28 is integrated with the No. 2 temperature sensor 29, and the No. 2 pressure sensor 28 and the No. 2 temperature sensor 29 are both installed in the No. 2 pressure test pipeline 30, and the No. 2 pressure sensor 28 and the No. 2 temperature sensor 29 are both connected to the signal transmission module 33.

[0044] The natural gas pre-module 9 in this embodiment includes a No. 1 natural gas filter storage tank 13 and a No. 2 natural gas filter storage tank 14 , the gas turbine 38 includes a combustion chamber 35 , an air compressor 36 and a power turbine 37 , and the No. 3 control solenoid valve 32 is connected to the combustion chamber 35 .

[0045] The test method of the combustion engine fuel inlet leakage test device based on pressure correction in this embodiment includes the following steps:

[0046] Step 1: Before the test begins, ensure that natural gas has been replaced between the natural gas inlet 1 and the manual valve 19, and ensure that the ESD valve 3, the booster outlet solenoid valve 7, the manual valve 19, the natural gas inlet solenoid valve 20, the No. 1 control solenoid valve 25 and the No. 3 control solenoid valve 32 are closed, and the No. 2 control solenoid valve 27 is open.

[0047] Step 2: Open the ESD valve 3 and the booster outlet solenoid valve 7, and start the natural gas booster 4, check whether the values ​​of the front module natural gas pressure gauge 15 and the front module natural gas thermometer 16 meet the ignition start-up conditions of the gas turbine 38, and switch the manual valve 19 to the open position.

[0048] Step 3: Parameter setting, set the opening and closing time interval t of the No. 1 control solenoid valve 25 a, t a The range is (5-10s), the time interval t between closing and opening of the second control solenoid valve 27 b , t b The range is (10-20s), and the pressure comparison constant C is set, and the range of C is (0-50psig); as the preferred t a Set to 5s, t b Set to 15s, C to 10psig.

[0049] Step 4: Data collection, the natural gas intake solenoid valve 20 is opened, the pressure of the No. 1 pressure sensor 22 is stable at the pressure value P0 of the natural gas pressure gauge 15 of the front module, the natural gas density meter 10 of the front module measures the natural gas density ρ value, the No. 2 control solenoid valve 27 is closed, and the No. 1 control solenoid valve 25 is opened. The data terminal 39 takes this moment as the initial 0s timing, and the gas turbine intake flow sensor 24 collects the flow Q1, t b At the moment, the control solenoid valve 25 is closed, and the engine intake air flow sensor 24 measures the flow rate Q2, t c At time -1, the second pressure sensor 28 measures the pressure P b , the second temperature sensor 29 measures the temperature T, t c At this moment, the second control solenoid valve 27 is opened.

[0050] Step 5: Data processing, calculate the corrected gas pressure in the following way:

[0051] According to P×V=n×R×T

[0052] Where P is the required pressure, V is the volume of the test section pipeline, n is the amount of gas, R is the universal gas constant, and T is the gas temperature;

[0053] The amount of gas n is calculated as: n = m / M

[0054] Where m is the mass of the gas in the test section pipeline, and M is the molar mass of the gas;

[0055] The gas mass m can be measured by the following method: m = ρ × Q × t a

[0056] Where ρ is the gas density flowing into the test pipeline, and its value is the natural gas density ρ value in step 4. Q is the gas flow rate flowing into the test pipeline, Q = (Q1 + Q2) / 2, t a is the time for gas to flow into the pipeline;

[0057] We obtain: P = ρ × (Q1 + Q2) × t a ×R×T / (M×V).

[0058] Step 6: Calculation and Judgment. Based on the pressure P obtained in Step 5, the second pressure sensor 28 measures the pressure P. b The method is as follows:

[0059] If P - P b <C condition is satisfied, it is determined that the pressure in the test pipeline is normal, the airtightness of the valve and the pipeline passes the test, and the starting requirement of the gas turbine 38 is met.

[0060] If P - P b >C condition is satisfied, it is determined that the pressure in the test pipeline is abnormal, the airtightness of the valve and the pipeline fails the test, and the starting requirement of the gas turbine 38 is not met.

[0061] Step 7: The heating step is a function expansion part. If the gas temperature is low or fluctuates greatly, the heater 17 is used to heat the gas in the pipeline. Set the required natural gas inlet temperature T. The PID controller controls the heater 17 to heat the natural gas according to the set temperature T, so as to ensure the stability of the inlet temperature. When this step is implemented, the temperature T in Step 5 is the temperature T set by the PID controller.

[0062] In this embodiment, one end of the first natural gas pipeline 2 is the natural gas inlet 1, and the other end is connected to the natural gas booster 4. An ESD valve 3 is installed on the first natural gas pipeline 2 to cut off the transmission of natural gas when a danger occurs.

[0063] In this embodiment, the natural gas booster 4 uses a booster motor 5 as the power source; the outlet of the natural gas booster 4 is connected to the inlet of the natural gas pre-module 9 through the second natural gas pipeline 6; a booster outlet solenoid valve 7 and a booster outlet flowmeter 8 are installed on the second natural gas pipeline 6.

[0064] In this embodiment, the third natural gas pipeline 18 connects the outlet of the natural gas pre-module 9 and the manual valve 19.

[0065] In this embodiment, the first pressure test pipeline 21 connects the natural gas inlet solenoid valve 20 and the first control solenoid valve 25; the natural gas inlet solenoid valve 20 is installed in the middle of the first pressure test pipeline 21; the second pressure test pipeline 30 connects the first control solenoid valve 25 and the third control solenoid valve 32, and the natural gas supply pipeline 34 connects the third control solenoid valve 32 and the gas turbine combustion chamber 35.

[0066] In this embodiment, there is an air vent pipeline 26 on the second pressure test pipeline 30, and the second control solenoid valve 27 is installed on the air vent pipeline 26; its function is to discharge natural gas when the gas turbine 38 shuts down or an accident occurs.

[0067] In this embodiment, the gas turbine 38 mainly includes: a combustion chamber 35 , an air compressor 36 and a power turbine 37 .

[0068] In this embodiment, the natural gas front module 9 includes a No. 1 natural gas filter storage tank 13 and a No. 2 natural gas filter storage tank 14; the top of the natural gas front module 9 is installed with a No. 1 safety valve 11, a No. 2 safety valve 12, a front module natural gas density meter 10, a front module natural gas pressure gauge 15 and a front module natural gas thermometer 16.

[0069] In this embodiment, the No. 1 pressure sensor 22, the No. 1 temperature sensor 23 and the engine intake air flow sensor 24 are all installed inside the No. 1 pressure test pipe 21; the No. 2 pressure sensor 28, the No. 2 temperature sensor 29 and the density sensor 31 are all installed inside the middle position of the No. 2 pressure test pipe 30.

[0070] In this embodiment, the natural gas intake solenoid valve 20, the No. 1 pressure sensor 22, the No. 1 temperature sensor 23, the engine intake flow sensor 24, the No. 1 control solenoid valve 25, the No. 2 control solenoid valve 27, the No. 2 pressure sensor 28, the No. 2 temperature sensor 29, the density sensor 31 and the No. 3 control solenoid valve 32 are connected to the No. 2 pressure sensor 28 through the signal transmission module 33.

[0071] In this embodiment, the heater 17 is installed at a position closer to the end of the No. 3 natural gas transmission pipeline 18. The heater 17 is connected to the data terminal 39 through the signal transmission module 33 and is controlled by a PID controller.

[0072] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A fuel inlet leakage test device for a combustion engine based on pressure correction, comprising a natural gas inlet (1), a natural gas booster (4), a booster outlet flow meter (8), a natural gas front module (9), a heater (17), a manual valve (19), a natural gas inlet solenoid valve (20), a No. 1 pressure test pipeline (21), a combustion engine intake flow sensor (24), a No. 1 control solenoid valve (25), an air pipeline (26), a No. 2 control solenoid valve (27), a No. 2 pressure test pipeline (30), a No. 3 control solenoid valve (32), a signal transmission module (33), a gas turbine (38) and a data terminal (39), characterized in that: The natural gas inlet (1) is connected to a natural gas booster (4), the natural gas booster (4) is connected to a natural gas front module (9) via a No. 2 natural gas transmission pipeline (6), the booster outlet flow meter (8) is installed on the No. 2 natural gas transmission pipeline (6), the natural gas front module (9) is connected to a manual valve (19) via a No. 3 natural gas transmission pipeline (18), the heater (17) is installed on the No. 3 natural gas transmission pipeline (18), the heater (17) is connected to a signal transmission module (33) via a signal line, the manual valve (19) is connected to a natural gas intake solenoid valve (20), the natural gas intake solenoid valve (20) is connected to a No. 1 control solenoid valve (25) via a No. 1 pressure test pipeline (21), and the The gas turbine intake air flow sensor (24) is installed on a No. 1 pressure test pipe (21); the No. 1 control solenoid valve (25) is connected to a No. 3 control solenoid valve (32) via a No. 2 pressure test pipe (30); the No. 3 control solenoid valve (32) is connected to a gas turbine (38); one end of the air-to-air pipe (26) is connected to the No. 2 pressure test pipe (30); the other end of the air-to-air pipe (26) is connected to the No. 2 control solenoid valve (27); the gas turbine intake air flow sensor (24), the No. 1 control solenoid valve (25), the No. 2 control solenoid valve (27) and the No. 3 control solenoid valve (32) are all connected to a signal transmission module (33) via a signal line; and the signal transmission module (33) is connected to a data terminal (39) via a signal line; The fuel inlet leakage test device for a fuel engine also includes a No. 1 natural gas transmission pipeline (2), an ESD valve (3), a booster motor (5), a booster outlet solenoid valve (7), a density sensor (31) and a natural gas supply pipeline (34); the natural gas inlet (1) is connected to the natural gas booster (4) via the No. 1 natural gas transmission pipeline (2); the ESD valve (3) is installed on the No. 1 natural gas transmission pipeline (2); the booster motor (5) is connected to the natural gas booster (4); the booster outlet solenoid valve (7) is installed on the No. 2 natural gas transmission pipeline (6); the density sensor (31) is installed in the No. 2 pressure test pipeline (30); the density sensor (31) is connected to the signal transmission module (33) via a signal line; and the No. 3 control solenoid valve (32) is connected to the combustion chamber (35) of the fuel engine via the natural gas supply pipeline (34); The fuel engine fuel inlet leakage test device further comprises a front module natural gas density meter (10), a No. 1 safety valve (11), a No. 2 safety valve (12), a front module natural gas pressure gauge (15), a front module natural gas thermometer (16), a No. 1 pressure sensor (22), a No. 1 temperature sensor (23), a No. 2 pressure sensor (28) and a No. 2 temperature sensor (29); the front module natural gas density meter (10), the No. 1 safety valve (11) and the No. 2 safety valve (12) are all connected to the natural gas front module (9) through a pipeline; the front module natural gas pressure gauge (15) is integrated with the front module natural gas thermometer (16) and connected to the natural gas front module (9). ) are connected via a signal line, the first pressure sensor (22) is integrated with the first temperature sensor (23), the first pressure sensor (22) and the first temperature sensor (23) are both installed in the first pressure test pipe (21), the first pressure sensor (22) and the first temperature sensor (23) are both connected to the signal transmission module (33), the second pressure sensor (28) is integrated with the second temperature sensor (29), the second pressure sensor (28) and the second temperature sensor (29) are both installed in the second pressure test pipe (30), and the second pressure sensor (28) and the second temperature sensor (29) are both connected to the signal transmission module (33).

2. The combustion engine fuel inlet leakage test device based on pressure correction according to claim 1 is characterized in that: The natural gas front module (9) comprises a No. 1 natural gas filter storage tank (13) and a No. 2 natural gas filter storage tank (14).

3. The combustion engine fuel inlet leakage test device based on pressure correction according to claim 1 is characterized in that: The gas turbine (38) comprises a combustion chamber (35), an air compressor (36) and a power turbine (37), and the third control solenoid valve (32) is connected to the combustion chamber (35).

4. A test method for a fuel inlet leakage test device for a combustion engine based on pressure correction according to any one of claims 1 to 3, characterized in that: The testing method comprises the following steps: Step 1: Before the test begins, ensure that natural gas has been replaced between the natural gas inlet (1) and the manual valve (19), and ensure that the ESD valve (3), the booster outlet solenoid valve (7), the manual valve (19), the natural gas inlet solenoid valve (20), the No. 1 control solenoid valve (25) and the No. 3 control solenoid valve (32) are closed, and the No. 2 control solenoid valve (27) is open; Step 2: Open the ESD valve (3) and the booster outlet solenoid valve (7), and start the natural gas booster (4), check whether the values ​​of the pre-module natural gas pressure gauge (15) and the pre-module natural gas temperature gauge (16) meet the ignition start-up conditions of the gas turbine (38), and switch the manual valve (19) to the open position; Step 3: Parameter setting, set the opening and closing time interval t of the No. 1 control solenoid valve (25) a , the time interval t between closing and opening of the second control solenoid valve (27) b , set the pressure comparison constant C; Step 4: Data collection, the natural gas intake solenoid valve (20) is opened, the pressure of the No. 1 pressure sensor (22) is stabilized at the pressure value P0 of the natural gas pressure gauge (15) of the front module, the natural gas density meter (10) of the front module measures the natural gas density ρ value, the No. 2 control solenoid valve (27) is closed, and the No. 1 control solenoid valve (25) is opened. The data terminal (39) takes this moment as the initial 0s timing, and the gas turbine intake flow sensor (24) collects the flow Q1, t b At the moment, the No. 1 control solenoid valve (25) is closed, and the engine intake air flow sensor (24) measures the flow rate Q2, t c At time -1, the second pressure sensor (28) measures the pressure P b , the second temperature sensor (29) measures the temperature T, t c At this moment, the second control solenoid valve (27) opens; Step 5: Data processing, calculate the corrected gas pressure in the following way: According to P×V=n×R×T Where P is the required pressure, V is the volume of the test section pipeline, n is the amount of gas, R is the universal gas constant, and T is the gas temperature; The amount of gas n is calculated as: n = m / M Where m is the mass of the gas in the test section pipeline, and M is the molar mass of the gas; The gas mass m can be measured by the following method: m = ρ × Q × t a Where ρ is the gas density flowing into the test pipeline, and its value is the natural gas density ρ value in step 4. Q is the gas flow rate flowing into the test pipeline, Q = (Q1 + Q2) / 2, t a is the time for gas to flow into the pipeline; We obtain: P = ρ × (Q1 + Q2) × t a ×R×T / (M×V); Step 6: Calculate and judge. According to the pressure P obtained in step 5, the second pressure sensor (28) measures the pressure P b , the method is as follows: If PP b If the condition <C is satisfied, it is determined that the pressure in the test pipeline is normal, the air tightness of the valve and the pipeline has passed the test, and the start-up requirements of the gas turbine (38) are met; If PP b > If the C condition is satisfied, it is determined that the pressure in the test pipeline is abnormal, the air tightness of the valve and the pipeline has not passed the test, and the start-up requirements of the gas turbine (38) have not been met.

5. The test method of the combustion engine fuel inlet leakage test device based on pressure correction according to claim 4 is characterized in that: The test method further comprises step 7 after step 6, Step 7: Heating. If the gas temperature is low or fluctuates greatly, use the heater (17) to heat the gas in the pipeline, set the required natural gas intake temperature T, and the PID controller controls the heater (17) to heat the natural gas according to the set temperature T, thereby ensuring the stability of the intake temperature. When this step is implemented, the temperature T in step 5 is the temperature T set by the PID controller.

6. The test method of the combustion engine fuel inlet leakage test device based on pressure correction according to claim 4 is characterized in that: Step 3: a The range is 5-10s, t b The range is 10-20s and the C range is 0-50psig.

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