Thermal protection system for full-temperature full-pressure performance test of main combustion chamber and operation method

Abstract

According to the main combustion chamber full-temperature full-pressure performance test thermal protection system and the operation method, adjustable cooling water and cooling gas can be provided for a measuring section, a rotation control mechanism, a test piece outer pipeline, a fuel oil pipeline and other parts in the main combustion chamber full-temperature full-pressure performance test process, and the safety work of a test bed and a test piece is guaranteed; cold source waste is reduced, test time is shortened, test efficiency is improved, and energy waste is reduced.

Description

Technical Field

[0001] This application belongs to the field of thermal protection for full-temperature and full-pressure performance testing of gas turbine main combustion chamber, specifically relating to a thermal protection system and operating method for full-temperature and full-pressure performance testing of main combustion chamber. Background Technology

[0002] The main combustion chamber is the power source of a gas turbine, and its performance significantly affects the overall performance of the machine. The complete design process of a main combustion chamber requires multiple rounds of testing and verification from the component level to the sub-component level, and finally, it must undergo full-environment performance testing and verification before it can be finalized.

[0003] During the main combustion chamber test, the outer casing temperature is high, which will cause a high heat load on some external pipelines of the test piece. The test bench needs to be equipped with a dedicated cooling pipeline to ensure the thermal protection requirements of various external pipelines. At the same time, various auxiliary pipelines on the test bench also need to be thermally protected by cooling air and cooling water. In addition, the measurement section designed for the test requirements needs to withstand the high temperature and high pressure environment at the combustion chamber outlet. The internal measurement sensing parts and rotating devices need to be thermally protected by high pressure cooling air and cooling water during operation. Therefore, the test bench needs to be equipped with a dedicated thermal protection system to ensure the safe and stable operation of the equipment and test pieces.

[0004] All main combustion chamber test benches are equipped with cooling gas and cooling water supply systems. The existing "high pressure, low flow" (air pressure not less than 3.5MPa, air flow not more than 5kg / s) main combustion chamber test benches are mainly for component-level main combustion chamber tests. The measurement section mainly adopts water cooling. Due to the low air flow, the complexity of the cooling structure of the measurement section and air pipeline is lower than that of the full temperature and full pressure test. The equipment as a whole has no special requirements for cooling water control capability. The cooling gas is used as auxiliary gas for the measurement section and sensing part. The cooling gas volume requirement is low, generally not exceeding 1kg / s. It is mostly supplied by an independent gas source. A double-layer water cooling structure is set up along the pipeline to cool the gas to meet the usage requirements. The matching of the test process with the airflow inside the test piece requires the coordination and joint control of two positions.

[0005] For the "medium pressure and medium flow" test bench (air pressure not exceeding 1MPa and air flow not exceeding 30kg / s) for component-level main combustion chamber testing, since the internal air pressure of the test piece is relatively low, the cooling water system does not need to consider the balance between the system supply pressure and the internal pressure of the pipeline. For the cooling gas system, the pressure adjustment requirements for the cooling gas used in the test piece and surrounding pipelines are also low. At the same time, the overall heat load is relatively low. Generally, gas is drawn from the upstream gas source pipeline and cooled by heat exchange through a simple double-walled water-cooled pipeline before use.

[0006] However, neither of these two schemes can be directly applied to the full-temperature and full-pressure (pressure not less than 3.5MPa, air flow not less than 100kg / s) performance test bench of the main combustion chamber, mainly due to the following disadvantages:

[0007] Double-walled water-cooled pipes have a good overall effect on cooling capacity and cost control for smaller air flow rates, but they cannot meet the large flow rate cooling air requirements of full-temperature and full-pressure test benches. Firstly, full-temperature and full-pressure tests require higher pressure cooling air, and the air temperature output from the air source is relatively high. Secondly, full-temperature and full-pressure tests have a large heat load, requiring a large flow rate of cooling air supply capacity. The water-cooled pipes along the pipeline cannot cool the high-temperature and large-flow air to a lower temperature in time.

[0008] Component-level and part-level tests mostly use simulated parts, which simplify some structures and are different from the parts on a real gas turbine. Therefore, the requirements for thermal protection are relatively low. However, full-temperature and full-pressure tests use the same combustion chamber components as a real gas turbine, which have high manufacturing costs and high requirements for thermal protection. Therefore, using air as the sole source of cooling gas for the cooling gas system is somewhat inadequate, especially during the process of purging residual fuel in the fuel line, which can easily lead to oxidation reactions and blockage of the fuel line. Improvements are needed.

[0009] On component and part-level test benches, the cooling water and cooling gas pressure requirements of different components are relatively simple and generally do not have independent adjustment functions. However, the full temperature and full pressure test bench has strict requirements for the supply of cooling water and cooling gas to each component under different working conditions. Existing thermal protection system solutions cannot finely adjust the supply of cooling medium to each component and cannot meet the performance test requirements of the full temperature and full pressure main combustion chamber.

[0010] The air source for component and part-level test benches generally needs to accommodate various high and low temperature tests. Therefore, it is set up with a heat exchanger for air cooling. This way, the test bench can quickly cool the test piece inlet by the low temperature air coming from upstream after the heating equipment is turned off. The high pressure and high flow rate air source used in the full temperature and pressure performance test bench is generally only used for high temperature tests. There is no supporting air source cooling facility. The traditional thermal protection system and process flow cannot meet the requirement of rapid temperature reduction of the test piece after the full temperature and pressure performance test in the main combustion chamber.

[0011] Cooling water systems need to spray water to cool the exhaust system to meet the emission temperature requirements. Traditional cooling water systems do not have the ability to control the spray state, resulting in low spray cooling efficiency and waste of water resources.

[0012] Therefore, existing main combustion chamber test benches are generally designed for "high pressure and low flow" or "medium pressure and medium flow" tests. The heat load on the test specimen and surrounding pipelines is relatively small. Generally, gas is drawn from the gas source, cooled by heat exchange through a simple double-walled water-cooled pipeline, and then sent to the test specimen, measuring section, and external pipelines that require cooling gas to meet the usage requirements. However, on test benches that can achieve full temperature and full pressure in the main combustion chamber, this cooling scheme is insufficient to meet the usage requirements and needs to be redesigned. Therefore, this application is made. Summary of the Invention

[0013] The purpose of this application is to provide a thermal protection system and operating method for the full-temperature and full-pressure performance test of the main combustion chamber, so as to overcome or mitigate at least one of the known technical defects.

[0014] The technical solution of this application is:

[0015] A thermal protection system for full-temperature and full-pressure performance testing of the main combustion chamber includes a cooling gas system and a cooling water system;

[0016] The cooling system includes air intake pipes, other gas intake pipes, measuring section intake pipes, and fuel line intake pipes;

[0017] The air intake pipe connects to the air source at the inlet and is divided into two branches at the outlet, which are respectively connected to the cooling air inlet of the external pipe of the test piece and the cooling air inlet of the rotating control mechanism of the measuring section.

[0018] The air intake pipeline is sequentially equipped with an air inlet valve, a water-cooled heat exchanger, a heat exchanger outlet pressure and temperature measuring point, an external pipeline group regulating valve, and an external pipeline group pressure and temperature measuring point.

[0019] Other gas inlet pipes are connected to an inert gas source, and an inert gas shut-off valve and an inert gas electric valve are installed on them in sequence.

[0020] The inlet of the measuring section's air inlet pipe is connected to the outlet of other gas inlet pipes, and the outlet is connected to the measuring section's cooling gas inlet. Gas switching valve, main pipe pressure and temperature measuring points, measuring section pipe regulating valve, and measuring section pipe pressure and temperature measuring points are installed sequentially on it.

[0021] An air switching solenoid valve is installed between the air intake pipeline and the measurement section air intake pipeline for connection.

[0022] The inlet of the fuel line is connected to the outlet of the other gas intake line, and the outlet is connected to the fuel line of the test piece. The inert gas regulating valve, the gas drying filter, the fuel line cold blowing pressure and temperature measuring point, the fuel line cold blowing manual valve, the fuel line cold blowing check valve, and the fuel line cold blowing solenoid valve are installed on it in sequence.

[0023] The cooling water system includes a low-pressure cooling water system and a high-pressure cooling water system;

[0024] The low-pressure cooling water system includes the main low-pressure cooling water inlet pipe and the main low-pressure cooling water return pipe;

[0025] The inlet of the low-pressure cooling water main inlet pipe is connected to the low-pressure cooling water source, and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece and its air intake system.

[0026] The low-pressure cooling water main inlet pipeline is equipped with a low-pressure cooling water pressure measuring point, a low-pressure cooling water electric valve, and a low-pressure cooling water filter in sequence. Each branch of the low-pressure cooling water main inlet pipeline is equipped with a low-pressure cooling water branch inlet electric valve, a low-pressure cooling water inlet temperature measuring point, and a low-pressure cooling water inlet flow measuring point in sequence.

[0027] The inlet of the low-pressure cooling water main return pipeline is divided into multiple branches, which are respectively connected to the cooling water return ports of the test piece and its air intake system, and the outlet is connected to the low-pressure cooling water source.

[0028] Each branch of the low-pressure cooling water main return water pipeline inlet is sequentially equipped with a low-pressure cooling water return water temperature measuring point and a low-pressure cooling water branch return water electric valve. The outlet pipeline is sequentially equipped with a low-pressure cooling water return water temperature and pressure measuring point and a low-pressure cooling water main return water electric valve.

[0029] The high-pressure cooling water system includes a main high-pressure cooling water inlet pipe and a main high-pressure cooling water return pipe;

[0030] The main high-pressure cooling water inlet pipe is connected to the high-pressure cooling water source at the inlet, and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece measurement section and its exhaust system.

[0031] The high-pressure cooling water main inlet pipeline is equipped with a high-pressure cooling water pressure measuring point, a high-pressure cooling water electric valve, and a high-pressure cooling water filter in sequence. Each branch of the high-pressure cooling water main inlet pipeline is equipped with a high-pressure cooling water branch inlet electric valve, a high-pressure cooling water inlet temperature measuring point, and a high-pressure cooling water inlet flow measuring point in sequence.

[0032] The inlet of the high-pressure cooling water main return pipeline is divided into multiple branches, which are respectively connected to the cooling water return ports of the test piece measurement section and its exhaust system, and the outlet is connected to the high-pressure cooling water source.

[0033] Each branch of the high-pressure cooling water main return water pipeline inlet is sequentially equipped with a high-pressure cooling water return water temperature measuring point and a high-pressure cooling water branch return water electric valve. The outlet pipeline is sequentially equipped with high-pressure cooling water return water temperature and pressure measuring points and a high-pressure cooling water main return water electric valve. According to at least one embodiment of this application, in the above-mentioned thermal protection system for the main combustion chamber full-temperature and full-pressure performance test, the two branches of the air intake pipeline outlet are connected to the air intake pipeline outlet via a three-way valve.

[0034] According to at least one embodiment of this application, in the above-mentioned thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber, the node connecting the air switching solenoid valve to the air intake pipeline is located between the heat exchanger outlet pressure and temperature measuring point and the external pipeline group regulating valve, and the node connecting the air intake pipeline of the measuring section is located between the main pipe pressure and temperature measuring point and the measuring section pipeline regulating valve.

[0035] According to at least one embodiment of this application, in the above-mentioned thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber, the fuel line intake pipe outlet is divided into multiple branches, which are connected to different test piece fuel lines. Each branch is sequentially equipped with a fuel line cold blow manual valve, a fuel line cold blow check valve, and a fuel line cold blow solenoid valve.

[0036] A thermal protection operation method for a main combustion chamber full-temperature and full-pressure performance test, implemented based on the aforementioned thermal protection system for the main combustion chamber full-temperature and full-pressure performance test, includes a cooling gas system operation method:

[0037] Before the test, depending on the fuel line used by the test piece, selectively open the fuel line cold blowing valve;

[0038] Before starting the test piece, first turn on the cooling water supply to the water-cooled heat exchanger, then fully open the air inlet valve, open and adjust the regulating valve of the external pipeline group, so that the air pressure measured at the pressure and temperature measuring points of the external pipeline group is not higher than 0.2MPa gauge pressure, open the air switching solenoid valve, open and adjust the regulating valve of the measuring section pipeline, so that the air pressure measured at the pressure and temperature measuring points of the measuring section pipeline is not higher than 0.2MPa gauge pressure;

[0039] Open the inert gas shut-off valve and the inert gas electric valve;

[0040] After the test piece is stably ventilated, open the fuel line cold blowing solenoid valve and open and adjust the inert gas regulating valve so that the gas pressure measured by the fuel line cold blowing pressure and temperature measuring point meets the minimum pressure required for fuel line purging when the test piece is shut down.

[0041] Before igniting the test piece, close the cold-blowing solenoid valve on the fuel line;

[0042] During the test, the regulating valves in the measuring section pipeline were adjusted to ensure that the cooling gas pressure in the pipeline was higher than the inlet pressure of the test piece;

[0043] After the test piece is turned off and the fuel is shut off, the fuel line cold blowing solenoid valve is opened to blow out the fuel in the fuel line.

[0044] According to at least one embodiment of this application, the above-described thermal protection operation method for the full-temperature and full-pressure performance test of the main combustion chamber includes a cooling water system operation method:

[0045] Before the test, fully open the low-pressure cooling water electric valve of the main low-pressure cooling water inlet pipe, open the low-pressure cooling water main return electric valve to 70%-100%, and open the branch valves of each branch.

[0046] Before the air intake system is about to receive air, open the high-pressure cooling water electric valve and the high-pressure cooling water return main electric valve.

[0047] This application has at least the following beneficial technical effects:

[0048] A thermal protection system and operating method for full-temperature and full-pressure performance testing of the main combustion chamber are provided. During the full-temperature and full-pressure performance testing of the main combustion chamber, adjustable cooling water and cooling air are provided for multiple components such as the measuring section, rotation control mechanism, external pipeline of the test piece, and fuel pipeline. This ensures the safe operation of the test bench and test piece, while reducing cold source waste, shortening post-test time, improving test efficiency, and reducing energy waste. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber provided in the embodiments of this application;

[0050] in:

[0051] 1-Air inlet valve; 2-Water-cooled heat exchanger; 3-Gas switching valve; 4-Inert gas regulating valve; 5-; 6-; 7-Heat exchanger outlet pressure and temperature measuring point; 8-Inert gas shut-off valve; 9-Inert gas electric valve; 10-Air switching solenoid valve; 11-Measuring section pipeline regulating valve; 12-Measuring section pipeline pressure and temperature measuring point; 13-External pipeline group regulating valve; 14-External pipeline group pressure and temperature measuring point; 15-Fuel pipeline cold blowing manual valve; 16-Fuel pipeline cold blowing check valve; 17-Fuel pipeline cold blowing solenoid valve; 18-Main pipe pressure and temperature measuring point; 19-Low-pressure cooling water pressure measuring point; 20-Low-pressure cooling water electric valve; 21-Low-pressure cooling water filter; 22-Low-pressure cooling water branch inlet electric valve. Valve; 23-Low-pressure cooling water inlet temperature measuring point; 24-Low-pressure cooling water inlet flow measuring point; 25-Low-pressure cooling water return temperature measuring point; 26-Low-pressure cooling water branch return electric valve; 27-Low-pressure cooling water return temperature and pressure measuring point; 28-Low-pressure cooling water return main electric valve; 29-High-pressure cooling water pressure measuring point; 30-High-pressure cooling water electric valve; 31-High-pressure cooling water filter; 32-High-pressure cooling water branch inlet electric valve; 33-High-pressure cooling water inlet temperature measuring point; 34-High-pressure cooling water inlet flow measuring point; 35-High-pressure cooling water return temperature measuring point; 36-High-pressure cooling water branch return electric valve; 37-High-pressure cooling water return temperature and pressure measuring point; 38-High-pressure cooling water return main electric valve.

[0052] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0053] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0054] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0055] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0056] This application provides a thermal protection system for full-temperature and full-pressure performance testing of the main combustion chamber. Addressing the thermal protection needs of multiple components during full-temperature and full-pressure performance testing, it utilizes cooling water and at least two types of cooling air sources, with multiple outlets and regulating and switching valves. This provides an efficient and convenient supply of thermal protection cooling media to test specimens, measuring sections, and other components under different operating conditions during full-temperature and full-pressure testing of the main combustion chamber. It overcomes the shortcomings and deficiencies of existing thermal protection systems directly applied to full-temperature and full-pressure performance testing. To meet the complex thermal protection requirements of the full-temperature and full-pressure test bench, it addresses the following problems:

[0057] The cooling gas system has the ability to cool high-pressure (not less than 5MPa) high-flow (4kg / s) gas from high temperature (about 300℃) to normal temperature (not higher than 30℃), while the pressure loss of the cooling gas after passing through the heat exchange pipeline does not exceed 1%. It uses a high-pressure resistant, high-efficiency, compact heat exchange device to cool the high-temperature gas.

[0058] Considering the cooling air source requirements of various equipment components, while using high-pressure air as the cooling air source, pipelines that can be connected to other gas sources are set up. Inert gas is used to purge the fuel pipeline to avoid oxidation of high-temperature fuel. Switching valves are used to efficiently adjust the flow direction of cooling air in the pipeline. The switching valves have corresponding linkage functions under automatic control settings to avoid conflicts and meet the thermal protection requirements of equipment with various combinations.

[0059] Each outlet pipeline is set with different cooling medium pressure according to different working conditions of the full temperature and full pressure test, which can accurately control the cooling medium pressure, without putting a large pressure burden on the equipment, and can better meet the cooling medium requirements of each component.

[0060] After the test, it can quickly reduce the inlet and internal temperature of the test piece, reduce the impact of the high heat environment on the equipment, and reduce the consumption of various energy sources.

[0061] The cooling water system has the ability to adjust the water spray status, and can adjust the water spray volume according to the test conditions to improve the cooling efficiency.

[0062] The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber provided in this application, such as Figure 1 As shown, it includes a cooling air system and a cooling water system.

[0063] The cooling system includes air intake pipes, other gas intake pipes, measurement section intake pipes, and fuel line intake pipes.

[0064] The air intake pipe is connected to the air source at the inlet and has two branches at the outlet, which are respectively connected to the cooling air inlet of the test piece's external pipe and the cooling air inlet of the measuring section's rotation control mechanism. These two branches are connected to the air intake pipe outlet via a three-way valve.

[0065] The air intake pipeline is sequentially equipped with an air inlet valve 1, a water-cooled heat exchanger 2, a heat exchanger outlet pressure and temperature measuring point 7, an external pipeline group regulating valve 13, and an external pipeline group pressure and temperature measuring point 14.

[0066] The inlet of the other gas inlet pipe is connected to other gas sources, which are inert gas sources. An inert gas shut-off valve 8 and an inert gas electric valve 9 are installed on it in sequence.

[0067] The inlet of the measuring section's air inlet is connected to the outlet of other gas inlet pipes, and the outlet is connected to the cooling gas inlet of the measuring section. Gas switching valve 3, main pipe pressure and temperature measuring point 18, measuring section pipeline regulating valve 11, and measuring section pipeline pressure and temperature measuring point 12 are installed sequentially on it.

[0068] An air switching solenoid valve 10 is installed between the air intake pipeline and the measuring section intake pipeline for connection. The connection point between the air switching solenoid valve 10 and the air intake pipeline is between the heat exchanger outlet pressure and temperature measuring point 7 and the external pipeline group regulating valve 13. The connection point between the air switching solenoid valve 10 and the measuring section intake pipeline is between the main pipeline pressure and temperature measuring point 18 and the measuring section pipeline regulating valve 11.

[0069] The inlet of the fuel line is connected to the outlet of the other gas intake line, and the outlet is connected to the fuel line of the test piece. The inert gas regulating valve 4, the gas drying filter 5, the fuel line cold blowing pressure and temperature measuring point 6, the fuel line cold blowing manual valve 15, the fuel line cold blowing check valve 16, and the fuel line cold blowing solenoid valve 17 are installed on it in sequence.

[0070] The fuel line intake and outlet can be divided into multiple branches, which connect to different test piece fuel lines. Each branch is equipped with a fuel line cold blow manual valve 15, a fuel line cold blow check valve 16, and a fuel line cold blow solenoid valve 17 in sequence.

[0071] For the cooling gas system, the arrows in the diagram indicate the gas flow direction. The upstream pipeline of air inlet valve 1 is connected to the air pipeline before the air inlet valve of the test piece. After air inlet valve 1, a water-cooled heat exchanger 2 is used. The cooling gas flowing through the water-cooled heat exchanger 2 is cooled by cooling water through shell-and-tube heat exchange. The water-cooled heat exchanger 2 is designed to withstand a pressure of not less than 5 MPa, with a cooling gas flow rate of not less than 4 kg / s, a cooling gas inlet temperature of not more than 300℃, an outlet temperature of not more than 30℃, and a cooling gas inlet and outlet pressure loss of not more than 1%. The temperature and pressure of the cooled gas after cooling can be measured and monitored through the heat exchanger outlet pressure and temperature measuring point 7. The cooling gas is mainly supplied to the external pipeline of the test piece, the rotation control mechanism, and the measuring section.

[0072] A regulating valve 11 is set up in the measuring section pipeline to regulate the cooling gas pressure. After the regulating valve 11, a measuring point 12 for measuring the pressure and temperature of the cooling gas is set up to measure and monitor the cooling gas pressure and temperature. A regulating valve 13 is set up in the external pipeline group to regulate the cooling gas pressure. After the regulating valve 13, a measuring point 14 for measuring the pressure and temperature of the external pipeline group is set up to measure and monitor the cooling gas pressure and temperature. The external pipeline and rotation control mechanism of the test piece are pipelines and equipment exposed to the atmospheric environment. Therefore, their cooling gas is directly sprayed into the environment. The cooling gas before the pipeline outlet can be set to the same value. Therefore, a three-way connection is used to synchronously deliver the cooling gas to the external pipeline and the rotation control mechanism pipeline.

[0073] An air switching solenoid valve 10 is installed to control whether the cooling air supplied by the air source enters the measuring section. Other gas source pipelines can be connected to gas cylinders as needed, and different types of inert gases can be selected. Inert gas shut-off valves 8 and inert gas electric valves 9 are installed on other gas source pipelines to quickly control whether inert gas enters other gas source pipelines. Inert gas is mainly used for purging the internal fuel line. It is connected to the cooling air line through the gas switching valve 3. An inert gas regulating valve 4 is installed on the other side to pre-adjust the pressure entering the fuel line. Finally, a gas dryer filter 5 is installed to remove various substances from the gas. Impurities and liquid water, gas pressure and temperature in the pipeline are measured through fuel pipeline cold blowing pressure and temperature measuring point 6. Then, according to the fuel pipeline configuration of the test bench, a fuel pipeline cold blowing manual valve 15 can be set to select the pipeline that needs to use cold blowing gas before the test. A fuel pipeline cold blowing check valve 16 is used to prevent fuel from entering the cooling gas pipeline in reverse. A fuel pipeline cold blowing solenoid valve 17 is set to quickly open and send the purging gas into the fuel pipeline at the end of the test. The main pipe pressure and temperature measuring point 18 is used to measure the cooling gas pressure and temperature when inert gas is used in the measuring section pipeline, the outer pipeline and the rotating control mechanism pipeline.

[0074] For instructions on operating the cooling system, please refer to the following:

[0075] (1) Before the test, selectively open the fuel line cold blowing valve 15 according to the fuel line used by the test piece;

[0076] (2) Before starting the test piece, first turn on the cooling water supply of the water-cooled heat exchanger 2, then fully open the air inlet valve 1, open and adjust the external pipeline group regulating valve 13 so that the air pressure measured at the external pipeline group pressure and temperature measuring point 14 is not higher than 0.2MPa (gauge pressure, the same below), open the air switching solenoid valve 10, open and adjust the measuring section pipeline regulating valve 11 so that the air pressure measured at the measuring section pipeline pressure and temperature measuring point 12 is not higher than 0.2MPa;

[0077] (3) Turn on other gas supply, and turn on inert gas shut-off valve 8 and inert gas electric valve 9;

[0078] (4) After the test piece is stably ventilated, open the fuel line cold blowing solenoid valve 17, open and adjust the inert gas regulating valve 4 so that the gas pressure measured by the fuel line cold blowing pressure and temperature measuring point 6 meets the minimum pressure required for the fuel line to be purged when the test piece is turned off.

[0079] (5) Before igniting the test piece, close the cold blowing solenoid valve 17 of the fuel line;

[0080] (6) During the test, adjust the regulating valve 11 of the measuring section pipeline to ensure that the cooling gas pressure in the pipeline is higher than the inlet pressure of the test piece. The pressure difference is determined according to the working requirements of the measuring section used.

[0081] (7) After the test piece is turned off, open the fuel line cold blowing solenoid valve 17 to blow out the fuel in the fuel line. The blowing time depends on the requirements.

[0082] (8) After the test, close each valve in sequence along the gas flow direction;

[0083] (9) The cooling air source can be supplied adaptively according to the usage requirements of the equipment and components. The supply method is as follows:

[0084] (a) Air cooling is used for the external pipeline and the rotation control mechanism pipeline. Inert gas is used to cool the measuring section pipeline and fuel is purged: After the work content of (4), close the air switching solenoid valve 10 and open the gas switching valve 3 so that the inert gas enters the measuring section pipeline through the measuring section pipeline regulating valve 11. Other operations are the same as normal work content.

[0085] (b) Use only inert gas to cool each pipeline: After the work content of (1), first carry out the work of (3). After completion, open the gas switching valve 3, open and adjust the external pipeline group regulating valve 13 so that the air pressure measured by the external pipeline group pressure and temperature measuring point 14 is not higher than 0.2MPa; open the air switching solenoid valve 10, open and adjust the measuring section pipeline regulating valve 11 so that the air pressure measured by the measuring section pipeline pressure and temperature measuring point 12 is not higher than 0.2MPa, and then carry out (4) and subsequent work content.

[0086] (c) Air cooling of each pipeline is used only: After completing (2) work, open the gas switching valve 3 and fully open the inert gas regulating valve 4. Then carry out (6) work. Before the test piece is shut off, the tester vent valve and the test piece inlet valve need to be adjusted so that the air pressure measured by the fuel pipeline cold blowing pressure and temperature measuring point 6 and the test piece inlet pressure meet the minimum pressure required for the fuel pipeline to be purged when the test piece is shut off. Then carry out (7) and (8) work.

[0087] (d) Using air-cooled external pipeline, rotation control mechanism pipeline and cooling measurement section pipeline, first use inert gas to purge fuel, and then switch to air for purging: operate according to normal working procedure, and after completing (7) work content, adjust the tester vent valve and test piece inlet valve so that the air pressure measured by the main pipe pressure and temperature measuring point 18 and the test piece inlet pressure meet the minimum pressure required for fuel pipeline purging when the test piece is extinguished, close the inert gas cut-off valve 8 and the inert gas electric valve 9, open the gas switching valve 3, fully open the inert gas regulating valve 4, and carry out subsequent purging work. After completion, carry out (8) work content.

[0088] After the full-temperature and full-pressure performance test, in order to prevent the test pieces from continuing to be subjected to a high-heat environment, the inlet temperature of the test pieces needs to be reduced to a certain value. Since the outlet air temperature of the air source is relatively high, in the past, it was necessary to continue to use the air source to purge for about 40 minutes after the test to reduce the temperature to the required temperature. After applying this thermal protection system, the air inlet valve of the test bench can be closed at the end of the test. The system can continuously introduce a large amount of cooling gas from the fuel line and measuring section of the test piece into the pipeline of the test bench and the interior of the test piece. The internal temperature of the test piece can be quickly reduced to the required temperature within 10 minutes, which greatly shortens the time waiting for the test piece to cool down after the test and reduces resource consumption.

[0089] The cooling water system includes a low-pressure cooling water system and a high-pressure cooling water system. The low-pressure cooling water system can provide cooling water pressure in the range of 0 to 1 MPa, while the high-pressure cooling water system can provide cooling water pressure in the range of 1 to 6.4 MPa. The cooling water system provides cooling water at different pressures as needed for the exhaust system, measuring section, test piece, and intake system.

[0090] The low-pressure cooling water system includes the main low-pressure cooling water inlet pipe and the main low-pressure cooling water return pipe.

[0091] The inlet of the low-pressure cooling water main inlet pipe is connected to the low-pressure cooling water source, and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece and its air intake system. The low-pressure cooling water main inlet pipe is equipped with a low-pressure cooling water pressure measuring point 19, a low-pressure cooling water electric valve 20, and a low-pressure cooling water filter 21 in sequence. Each branch of the low-pressure cooling water main inlet pipe is equipped with a low-pressure cooling water branch inlet electric valve 22, a low-pressure cooling water inlet temperature measuring point 23, and a low-pressure cooling water inlet flow measuring point 24 in sequence.

[0092] The inlet of the low-pressure cooling water main return pipeline is divided into multiple branches, which are connected to the cooling water return ports of the test piece and its air intake system respectively. The outlet can be connected to the low-pressure cooling water source. Each branch of the low-pressure cooling water main return pipeline inlet is equipped with a low-pressure cooling water return temperature measuring point 25 and a low-pressure cooling water branch return electric valve 26 in sequence. The outlet pipeline is equipped with a low-pressure cooling water return temperature and pressure measuring point 27 and a low-pressure cooling water main return electric valve 28 in sequence.

[0093] In the low-pressure cooling water system, the pressure at the cooling water supply end is monitored by the low-pressure cooling water pressure measuring point 19. The on / off status of the main low-pressure cooling water inlet pipe is controlled by the low-pressure cooling water electric valve 20. The low-pressure cooling water is filtered by the low-pressure cooling water filter 21. The low-pressure cooling water branch inlet electric valve 22 and the low-pressure cooling water branch return electric valve 26 can adjust the low-pressure cooling water pressure and flow rate of the branch. The low-pressure cooling water inlet temperature measuring point 23 and the low-pressure cooling water inlet flow measuring point 24 are used to monitor the status of the branch cooling water supply end. The low-pressure cooling water return temperature measuring point 25 is used to monitor the status of the branch cooling water return end. The low-pressure cooling water return main pipe electric valve 28 is used to control the on / off status of the main low-pressure cooling water return pipe. The low-pressure cooling water return temperature and pressure measuring point 27 is used to monitor the status of the main low-pressure cooling water return pipe.

[0094] The high-pressure cooling water system includes a main high-pressure cooling water inlet pipeline and a main high-pressure cooling water return pipeline.

[0095] The high-pressure cooling water main inlet pipe is connected to the high-pressure cooling water source at the inlet, and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece measurement section and its exhaust system. The high-pressure cooling water main inlet pipe is equipped with a high-pressure cooling water pressure measuring point 29, a high-pressure cooling water electric valve 30, and a high-pressure cooling water filter 31 in sequence. Each branch at the outlet of the high-pressure cooling water main inlet pipe is equipped with a high-pressure cooling water branch inlet electric valve 32, a high-pressure cooling water inlet temperature measuring point 33, and a high-pressure cooling water inlet flow measuring point 34 in sequence.

[0096] The inlet of the high-pressure cooling water main return pipeline is divided into multiple branches, which are respectively connected to the cooling water return ports of the test specimen measurement section and its exhaust system. The outlet can be connected to the high-pressure cooling water source. Each branch of the high-pressure cooling water main return pipeline inlet is equipped with a high-pressure cooling water return temperature measuring point 35 and a high-pressure cooling water branch return electric valve 36. The outlet pipeline is equipped with a high-pressure cooling water return temperature and pressure measuring point 37 and a high-pressure cooling water main return electric valve 38.

[0097] In the high-pressure cooling water system, the pressure at the cooling water supply end is monitored by high-pressure cooling water pressure measuring point 29. The on / off status of the main high-pressure cooling water inlet pipe is controlled by high-pressure cooling water electric valve 30. The high-pressure cooling water is filtered by high-pressure cooling water filter 31. The high-pressure cooling water branch inlet electric valve 32 and the high-pressure cooling water branch return electric valve 36 can adjust the branch high-pressure cooling water pressure and flow rate. The high-pressure cooling water inlet temperature measuring point 33 and the high-pressure cooling water inlet flow measuring point 34 are used to monitor the status of the branch cooling water supply end. The high-pressure cooling water return temperature measuring point 35 is used to monitor the status of the branch cooling water return end. The high-pressure cooling water return main pipe electric valve 38 is used to control the on / off status of the main high-pressure cooling water return pipe. The high-pressure cooling water return temperature and pressure measuring point 37 is used to monitor the status of the main return pipe. The high-pressure cooling water system needs to spray water to cool the exhaust system to meet the discharge temperature requirements. The spraying state is regulated by the electric valve 32 of the high-pressure cooling water branch, and the high-pressure cooling water inlet temperature measuring point 33 and the high-pressure cooling water inlet flow measuring point 34 monitor the spraying pressure and flow rate of the pipeline.

[0098] For details on operating the cooling water system, please refer to the following:

[0099] (1) Before the test, fully open the low-pressure cooling water electric valve 20 of the main low-pressure cooling water inlet pipeline, open the low-pressure cooling water main return water electric valve 28 to 70%-100%, and open the branch valves. Adjust the low-pressure cooling water pressure and flow rate of the branch through the branch inlet electric valve and the branch return water electric valve. After the low-pressure cooling water comes in, check the pipeline and connection for leaks one by one.

[0100] (2) Before the intake system is about to take in air, open the high-pressure cooling water electric valve 30 and the high-pressure cooling water return main electric valve 38, open the water supply electric valve and return valve of each branch, and check whether there is any leakage at each joint connection and pipeline after the high-pressure cooling water comes in.

[0101] (3) During the test, closely observe the changes in the return water temperature of each branch of the high and low pressure cooling water, and regulate the cooling water pressure and flow rate through the electric valves of each branch to ensure that the return water temperature of each branch is not greater than 60℃;

[0102] (4) When adjusting the high-pressure (air pressure in the intake and exhaust system exceeds 1.0 MPa) test conditions, the air-water pressure balance should be considered while ensuring the return water temperature requirement. The following should be ensured: ① The difference between the water supply pressure of each component in the measuring section and the high-temperature gas pressure should be within ±1.0 MPa; ② The difference between the water supply pressure of the test piece and the high-temperature gas pressure inside the test piece should be within ±1.5 MPa; ③ The cooling water supply pressure of the sensing part in the measuring section should be higher than the high-temperature gas pressure, with a difference between the two between 1.0 and 1.5 MPa. During the adjustment process, attention should be paid to fluctuations in the air pressure value within the intake and exhaust system to maintain a balance between air and water pressures.

[0103] (5) When conducting different test conditions, adjust the corresponding valves of the water spray to accurately match the exhaust temperature and flow rate, etc., to adjust the water spray volume, reduce the air flow fluctuation caused by water spray, and ensure the test accuracy.

[0104] (6) Before the test is stopped, due to the decrease in air pressure in the intake and exhaust system and the test piece, and considering the balance of air and water pressure, the high-pressure cooling water inlet pressure needs to be reduced accordingly, and the main / branch valves of the high-pressure cooling water supply should be closed.

[0105] (7) After the test piece is extinguished, gradually close the electric valves for the main / branch supply of high-pressure cooling water and the return valves for the main / branch. After the air supply to the test piece is stopped, gradually close the electric valves for the main / branch supply of low-pressure cooling water and the return valves for the main / branch.

[0106] Thermal protection system and operating methods for full-temperature and full-pressure performance test of main combustion chamber:

[0107] To address the diverse thermal protection needs of various components during the full-temperature and full-pressure performance test of the main combustion chamber of a gas turbine, including the measurement section, rotation control mechanism, external piping of the test piece, intake system, exhaust system, and fuel pipeline, a comprehensive thermal protection system is constructed using heat exchangers, regulating valves, shut-off valves, and pipelines. This system can meet the varying pressure cooling gas and cooling water requirements of each component during the test.

[0108] The cooling gas system is equipped with multiple interfaces for different hardware conditions, which can independently control the working pressure of the cooling gas pipeline of each component. It can quickly switch the cooling gas source according to the test requirements and use cooling gas with different compositions to meet the thermal protection requirements of each component of the test bench.

[0109] The cooling water system has the ability to independently control the cooling water pressure and flow rate of each component, meet the usage requirements, and maximize the control of the pressure difference between the cooling water and the medium inside the pipeline, thereby extending the service life of the equipment.

[0110] The operating method includes various combinations of thermal protection and cooling systems, enabling rapid reduction of test piece temperature after testing, and adjustable water spray capability. The water spray state can be adjusted according to the exhaust system requirements to improve efficiency.

[0111] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A thermal protection system for full-temperature and full-pressure performance testing of the main combustion chamber, characterized in that, Including the cooling air system; The cooling system includes air intake pipes, other gas intake pipes, measuring section intake pipes, and fuel line intake pipes; The air intake pipe connects to the air source at the inlet and is divided into two branches at the outlet, which are respectively connected to the cooling air inlet of the external pipe of the test piece and the cooling air inlet of the rotating control mechanism of the measuring section. An air inlet valve (1), a water-cooled heat exchanger (2), a heat exchanger outlet pressure and temperature measuring point (7), an external pipeline group regulating valve (13), and an external pipeline group pressure and temperature measuring point (14) are sequentially installed on the air inlet pipeline. Other gas inlet pipes are connected to an inert gas source, and an inert gas shut-off valve (8) and an inert gas electric valve (9) are installed on them in sequence. The inlet of the measuring section air inlet is connected to the outlet of other gas inlet pipes, and the outlet is connected to the cooling gas inlet of the measuring section. Gas switching valve (3), main pipe pressure and temperature measuring point (18), measuring section pipeline regulating valve (11), and measuring section pipeline pressure and temperature measuring point (12) are installed on it in sequence. An air switching solenoid valve (10) is installed between the air intake pipeline and the measurement section intake pipeline for connection; The inlet of the fuel line is connected to the outlet of the other gas inlet line, and the outlet is connected to the fuel line of the test piece. The inert gas regulating valve (4), the gas drying filter (5), the fuel line cold blowing pressure and temperature measuring point (6), the fuel line cold blowing manual valve (15), the fuel line cold blowing check valve (16), and the fuel line cold blowing solenoid valve (17) are installed on it in sequence.

2. The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 1, characterized in that, The two branches of the air intake pipe outlet are connected to the air intake pipe outlet via a three-way valve.

3. The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 2, characterized in that, The node connecting the air switching solenoid valve (10) to the air intake pipeline is between the heat exchanger outlet pressure and temperature measuring point (7) and the external pipeline group regulating valve (13), and the node connecting the air intake pipeline of the measuring section is between the main pipe pressure and temperature measuring point (18) and the measuring section pipeline regulating valve (11).

4. The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 3, characterized in that, The fuel line intake and outlet are divided into multiple branches, which connect to different test piece fuel lines. Each branch is equipped with a fuel line cold blow manual valve (15), a fuel line cold blow check valve (16), and a fuel line cold blow solenoid valve (17).

5. The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 4, characterized in that, This includes a cooling water system, which includes a low-pressure cooling water system. The low-pressure cooling water system includes the main low-pressure cooling water inlet pipe and the main low-pressure cooling water return pipe; The inlet of the low-pressure cooling water main inlet pipe is connected to the low-pressure cooling water source, and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece and its air intake system. The low-pressure cooling water pressure measuring point (19), the low-pressure cooling water electric valve (20), and the low-pressure cooling water filter (21) are sequentially installed on the inlet pipe of the low-pressure cooling water main inlet pipe. The low-pressure cooling water branch inlet electric valve (22), the low-pressure cooling water inlet temperature measuring point (23), and the low-pressure cooling water inlet flow measuring point (24) are sequentially installed on each branch of the low-pressure cooling water main outlet pipe. The inlet of the low-pressure cooling water main return pipeline is divided into multiple branches, which are connected to the cooling water return ports of the test piece and its air intake system respectively. The outlet is connected to the low-pressure cooling water source. Each branch of the low-pressure cooling water main return pipeline inlet is equipped with a low-pressure cooling water return temperature measuring point (25) and a low-pressure cooling water branch return electric valve (26). The outlet pipeline is equipped with a low-pressure cooling water return temperature and pressure measuring point (27) and a low-pressure cooling water main return pipeline electric valve (28).

6. The thermal protection system for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 5, characterized in that, The cooling water system includes a high-pressure cooling water system; The high-pressure cooling water system includes a main high-pressure cooling water inlet pipe and a main high-pressure cooling water return pipe; The high-pressure cooling water main inlet pipe is connected to the high-pressure cooling water source at the inlet and the outlet is divided into multiple branches, which are respectively connected to the cooling water inlet of the test piece measurement section and its exhaust system. The high-pressure cooling water pressure measuring point (29), the high-pressure cooling water electric valve (30), and the high-pressure cooling water filter (31) are sequentially installed on the pipe at the inlet of the high-pressure cooling water main inlet pipe. Each branch at the outlet of the high-pressure cooling water main inlet pipe is sequentially installed with a high-pressure cooling water branch inlet electric valve (32), a high-pressure cooling water inlet temperature measuring point (33), and a high-pressure cooling water inlet flow measuring point (34). The inlet of the high-pressure cooling water main return pipeline is divided into multiple branches, which are connected to the cooling water return ports of the test specimen measurement section and its exhaust system, respectively. The outlet is connected to the high-pressure cooling water source. Each branch of the high-pressure cooling water main return pipeline inlet is equipped with a high-pressure cooling water return temperature measuring point (35) and a high-pressure cooling water branch return electric valve (36). The outlet pipeline is equipped with a high-pressure cooling water return temperature and pressure measuring point (37) and a high-pressure cooling water main return electric valve (38).

7. A thermal protection operation method for a full-temperature and full-pressure performance test of a main combustion chamber, implemented based on the thermal protection system for a full-temperature and full-pressure performance test of a main combustion chamber as described in claim 6, characterized in that, Including the operating methods of the cooling system: Before the test, depending on the fuel line used by the test piece, selectively open the fuel line cold blowing valve (15). Before starting the test piece, first turn on the water-cooled heat exchanger (2) to supply cooling water, then fully open the air inlet valve (1), open and adjust the external pipeline group regulating valve (13) so that the air pressure measured by the external pipeline group pressure and temperature measuring point (14) is not higher than 0.2MPa gauge pressure, open the air switching solenoid valve (10), open and adjust the measuring section pipeline regulating valve (11) so that the air pressure measured by the measuring section pipeline pressure and temperature measuring point (12) is not higher than 0.2MPa gauge pressure; Open the inert gas shut-off valve (8) and the inert gas electric valve (9); After the test piece is stably ventilated, the fuel line cold blowing solenoid valve (17) is opened, and the inert gas regulating valve (4) is opened and adjusted so that the gas pressure measured by the fuel line cold blowing pressure and temperature measuring point (6) meets the minimum pressure required for the fuel line to be purged when the test piece is turned off. Before igniting the test piece, close the cold blowing solenoid valve (17) of the fuel line. During the test, adjust the regulating valve (11) of the measuring section pipeline to ensure that the cooling gas pressure in the pipeline is higher than the inlet pressure of the test piece; After the test piece is turned off and the fuel is shut off, the fuel line cold blowing solenoid valve (17) is opened to blow out the fuel in the fuel line.

8. The thermal protection operation method for the full-temperature and full-pressure performance test of the main combustion chamber according to claim 7, characterized in that, Including operating procedures for the cooling water system: Before the test, fully open the low-pressure cooling water electric valve (20) of the main low-pressure cooling water inlet pipeline, open the low-pressure cooling water return valve (28) to 70%-100%, and open the branch valves of each branch. Before the air intake system is about to take in air, open the high-pressure cooling water electric valve (30) and the high-pressure cooling water return main electric valve (38).

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