阅读说明：本技术 一种深度调峰燃气轮机叶片冷却疲劳试验系统及方法 (Deep peak regulation gas turbine blade cooling fatigue test system and method ) 是由 李存文 王在华 徐克涛 魏宏鸽 张杨 于 2020-03-18 设计创作，主要内容包括：本发明涉及一种深度调峰燃气轮机叶片冷却疲劳试验系统及方法,叶片冷却疲劳试验系统包括给气系统、燃气供给系统、空气冷却系统、冷却试验系统、尾气处理系统、燃烧室和叶片试验腔。燃烧室和叶片试验腔连接,给气系统用于向燃烧室提供一次风和二次风气源,燃气供给系统用于向燃烧室提供燃气,燃气供给系统包括一号增压风机、燃气罐、中间储罐、雾化喷嘴和助燃雾化喷嘴；空气冷却系统包括副储气罐、换热器和二号增压风机；冷却试验系统包括水箱、水泵、增压变频水泵、水温调节装置、水流量调节器和水喷射器。本试验系统可用于叶片冷却试验及不同燃烧配风方式的影响,即同一实验系统可完成不同的实验,具有功能多、可拓展、适用性强的优点。(The invention relates to a cooling fatigue test system and method for a deep peak shaving gas turbine blade. The combustion chamber is connected with the blade test cavity, the gas supply system is used for supplying a primary air source and a secondary air source to the combustion chamber, the gas supply system is used for supplying gas to the combustion chamber, and the gas supply system comprises a first booster fan, a gas tank, an intermediate storage tank, an atomizing nozzle and a combustion-supporting atomizing nozzle; the air cooling system comprises an auxiliary air storage tank, a heat exchanger and a second booster fan; the cooling test system comprises a water tank, a water pump, a supercharging variable frequency water pump, a water temperature adjusting device, a water flow regulator and a water ejector. The test system can be used for the influence of blade cooling tests and different combustion air distribution modes, namely, different tests can be completed by the same test system, and the test system has the advantages of multiple functions, expandability and strong applicability.)

1. The utility model provides a degree of depth peak regulation gas turbine blade cooling fatigue test system which characterized in that: comprises a gas supply system, a fuel gas supply system, an air cooling system, a cooling test system, a tail gas treatment system, a combustion chamber (22) and a blade test cavity (23); the combustion chamber (22) is connected with the blade test cavity (23), and an expansion joint (12) and a second voltage stabilizer (13) are arranged on a connecting pipeline of the combustion chamber;

the air supply system is used for providing a primary air source and a secondary air source for the combustion chamber (22), and comprises a main flow compression fan (1), a secondary flow compression fan (2), a first pressure stabilizing box (2-1), a main air storage tank (7), a swirler (11) and a swirl nozzle (7-2); the main flow compression fan (1) and the secondary flow compression fan (2) are both connected with an air inlet of a first pressure stabilizing box (2-1), an air outlet of the first pressure stabilizing box (2-1) is connected with an air inlet of a main air storage tank (7), an electric heating wire (7-1) is installed at the bottom in the main air storage tank (7), an air outlet of the main air storage tank (7) is divided into two paths, one path is connected with a swirler (11), the other path is connected with a swirl nozzle (7-2), and the swirler (11) and the swirl nozzle (7-2) are both installed in a combustion chamber (22);

the gas supply system is used for supplying gas to the combustion chamber (22), and comprises a first booster fan (3), a gas tank (4), an intermediate storage tank (5), an atomizing nozzle (5-2) and a combustion-supporting atomizing nozzle (5-3); the first booster fan (3) and the gas tank (4) are both connected with the intermediate storage tank (5), the gas outlet of the intermediate storage tank (5) is divided into two paths, one path is connected with the atomizing nozzle (5-2), the other path is connected with the combustion-supporting atomizing nozzle (5-3), the atomizing nozzle (5-2) is connected with the swirler (11), and the combustion-supporting atomizing nozzle (5-3) is installed in the combustion chamber (22);

the air cooling system comprises an auxiliary air storage tank (6), a heat exchanger (8) and a second booster fan (9); the auxiliary gas storage tank (6), the heat exchanger (8) and the second booster fan (9) are sequentially connected through pipelines, and the auxiliary gas storage tank (6) is connected with the main flow compression fan (1) and the secondary flow compression fan (2); the air outlet of the second booster fan (9) is communicated with the connecting blade test cavity (23);

the cooling test system comprises a water tank (16), a water pump (15), a pressure boost variable frequency water pump (14), a water temperature adjusting device (14-1), a water flow regulator (14-2) and a water injector (14-3); the water tank (16) is connected with the water pump (15), a water outlet of the water pump (15) is divided into two paths, one path is directly communicated with the blade test cavity (23) for water cooling test of the blade, the other path is sequentially provided with the supercharging variable frequency water pump (14), the water temperature adjusting device (14-1), the water flow adjuster (14-2) and the water ejector (14-3), and the water ejector (14-3) is connected with the blade test cavity (23) and is used for spraying steam fog into the blade test cavity (23) to perform steam fog cooling test on the blade.

2. The deep peaking gas turbine blade cooling fatigue test system of claim 1, wherein: the blade cooling and fatigue testing system also comprises a tail gas treatment system, wherein the tail gas treatment system comprises a tail gas treatment device (18), a silencer (19) and a tail gas discharge device (20) which are sequentially connected; the tail gas treatment device (18) is connected with the blade test cavity (23), and a cooler (17) is arranged on a connecting pipeline of the tail gas treatment device and the blade test cavity.

3. The deep peaking gas turbine blade cooling fatigue test system of claim 2, wherein: the cooler (17) is connected with the water tank (16) through a pipeline.

4. The deep peaking gas turbine blade cooling fatigue test system of claim 1, wherein: a cooling water recovery pipeline (21) is further arranged between the blade test cavity (23) and the water tank (16), and a valve is mounted on the cooling water recovery pipeline (21).

5. The deep peaking gas turbine blade cooling fatigue test system of claim 1, wherein: the blade cooling and fatigue testing system further comprises a monitoring system (10), wherein the monitoring system (10) comprises a flame monitoring device (10-1) and a blade temperature monitoring system (10-2), the flame monitoring device (10-1) is installed in the combustion chamber (22), and the blade temperature monitoring system (10-2) is installed in the blade testing cavity (23).

6. A method for testing cooling fatigue of a blade of a deep peaking gas turbine, which is implemented by using the system of any one of claims 1 to 5, wherein: the method comprises the following steps:

a rotating shaft is arranged in the blade test cavity (23), firstly, the blade is arranged on the rotating shaft, the connecting end of the rotating shaft is connected with the gear box, then, other test equipment is arranged, and after the test system is verified to be complete and trial-rotated, the blade is adjusted to a test rotating speed through the gear box;

then a main flow compression fan (1) is started, air enters a first pressure stabilizing box (2-1) through an electric door and a pressure reducing valve, the pressure of an air source is maintained to be stable, and sudden rising and sudden falling of the pressure are prevented; starting an electric heating wire (7-1) to heat air, and regulating the air flow through a flow controller;

then, starting a first booster fan (3), enabling the fuel gas to pass through a pressure regulating valve and an intermediate storage tank (5) in sequence, and regulating the flow by a flow electromagnetic valve; the fuel gas enters the cyclone (11) through the fuel gas nozzle (5-2) and is fully mixed with the air (provided by primary air) in the cyclone (11);

then starting an ignition device to ignite, burning the gas in a combustion chamber (22), monitoring the combustion condition by using a flame monitoring device (10-1) and analyzing the components of the combustion products; during testing, if the primary air volume is insufficient, the secondary flow compression fan (2) is started by the control system to provide an air source for the combustion chamber (22); if the oxygen content of the flue gas is too high, starting an auxiliary fuel system, enabling the fuel to enter a combustion chamber (22) for combustion after passing through a swirler, and meanwhile, installing a combustion stabilizer in the combustion chamber (22) to stabilize combustion; the burned flue gas enters a second pressure stabilizing box (13) after passing through an expansion joint (12), an electromagnetic valve and a pressure regulating valve, then enters a heat exchanger (8) for heat exchange, and the cooled flue gas is discharged into a tail gas treatment system after being subjected to noise reduction through a silencer (19); when a blade impingement cooling test is carried out, a first booster fan (3) is started, the air temperature of a temperature controller is set, the pressure and the flow are regulated, a Research-N3 thermal infrared imager is adopted to carry out non-contact measurement on the surface of a blade, and then SmartIRPC software is used for carrying out temperature analysis on a shot blade photo; when a blade air film cooling test is carried out, the blade is replaced by a blade with grooves and small holes on the surface in advance for testing; when the steam fog cooling test is carried out, after the electromagnetic valve is opened, water passes through the water temperature adjusting device (14-1), the water flow regulator (14-2) and the water injector (14-3) to carry out the steam fog cooling test.

7. Adjusting the pressure and the flow rate to perform a cooling test according to the test requirements; when the water-cooling test of the blades is carried out, one path of the water outlet of the water pump (15) is directly led to the test cavity (23) of the connected blades, and the water-cooling test of the blades is carried out.

Technical Field

The invention relates to the field of gas turbine devices, in particular to a cooling fatigue test system for a deep peak shaving gas turbine blade.

Background

Gas turbines are an important heat-to-work conversion device. The method is widely applied to the fields of aviation, ships and power generation, and particularly in recent years, the domestic energy and power industry is developing the work of replacing a small-capacity coal-fired unit by a large-capacity gas turbine in a tight and dense mode, so that the adaptability of a power station to power grid peak regulation is improved by means of fast peak regulation of starting of a gas turbine, and the environment-friendly emission condition of the power station can be improved. In the face of such large-scale operation of gas turbines, the safe and stable operation of the gas turbines is particularly important, especially the performance of the gas turbine blades.

With the continuous increase of the temperature of the blade turbine, the operation temperature of the blade turbine is far higher than the allowable metal temperature, and the variation range of the operation temperature of the blades of the combustion engine is increased under the peak regulation requirement. In order to ensure the safe and stable operation of the gas turbine under the sudden temperature change, a high-efficiency and scientific cooling method for the blades of the gas turbine is very important and urgent. At present, the cooling modes of the gas turbine blade mainly include impingement cooling, air film cooling, steam fog cooling and the like. The existing research aiming at the cooling technology of the gas turbine blade is increasingly emphasized, and a test device is required to be provided to complete the deep and comprehensive research on the cooling of the blade.

For example, patent application publication No. CN 108106829A: a high cycle fatigue test method and a device for a large-scale blade of a gas turbine are disclosed, wherein a common fatigue test machine can be used for performing a high cycle fatigue test on a fatigue weak part of the large-scale blade of the gas turbine through the load spectrum analysis of the gas turbine blade, the design and processing of a blade test piece, the design of a special clamp and the design of a loading load spectrum of the fatigue test machine, so that the high cycle fatigue performance examination can be realized closer to the actual working condition. But does not consider the cooling performance of the blade at high cycles and the blade temperature profile analysis.

Therefore, it is necessary to design a deep peaking gas turbine blade cooling fatigue test system for performing comprehensive tests on the blades.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a deep peak regulation gas turbine blade cooling fatigue test system with reasonable structural design and complete system, and provides a test method.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a degree of depth peak regulation gas turbine blade cooling fatigue test system which characterized in that: the device comprises a gas supply system, a fuel gas supply system, an air cooling system, a cooling test system, a tail gas treatment system, a combustion chamber and a blade test cavity. The combustion chamber is connected with the blade test cavity, and an expansion joint and a second voltage stabilizer are arranged on a connecting pipeline of the combustion chamber and the blade test cavity; the air supply system is used for providing a primary air source and a secondary air source for the combustion chamber and comprises a main flow compression fan, a secondary flow compression fan, a first pressure stabilizing box, a main air storage tank, a swirler and a swirl nozzle; the main flow compression fan and the secondary flow compression fan are both connected with an air inlet of a first pressure stabilizing box, an air outlet of the first pressure stabilizing box is connected with an air inlet of a main air storage tank, an electric heating wire is mounted at the bottom in the main air storage tank, the air outlet of the main air storage tank is divided into two paths, one path is connected with a swirler, the other path is connected with a swirl nozzle, and the swirler and the swirl nozzle are both mounted in a combustion chamber; the gas supply system is used for supplying gas to the combustion chamber and comprises a first booster fan, a gas tank, an intermediate storage tank, an atomizing nozzle and a combustion-supporting atomizing nozzle; the first booster fan and the gas tank are both connected with the intermediate storage tank, the gas outlet of the intermediate storage tank is divided into two paths, one path is connected with the atomizing nozzle, the other path is connected with the combustion-supporting atomizing nozzle, the atomizing nozzle is connected with the swirler, and the combustion-supporting atomizing nozzle is arranged in the combustion chamber; the air cooling system comprises an auxiliary air storage tank, a heat exchanger and a second booster fan; the auxiliary gas storage tank, the heat exchanger and the second booster fan are sequentially connected through pipelines, and the auxiliary gas storage tank is connected with both the main flow compression fan and the secondary flow compression fan; the air outlet of the second booster fan is communicated with the connecting blade test cavity; the cooling test system comprises a water tank, a water pump, a supercharging variable frequency water pump, a water temperature adjusting device, a water flow regulator and a water ejector; the water tank is connected with the water pump, the water outlet of the water pump is divided into two paths, one path of water outlet is directly communicated with the blade test cavity for water cooling test of the blade, the other path of water outlet is sequentially provided with the supercharging variable frequency water pump, the water temperature adjusting device, the water flow regulator and the water injector, and the water injector is connected with the blade test cavity for spraying vapor fog into the blade test cavity and performing vapor fog cooling test on the blade.

Preferably, the blade cooling and fatigue testing system further comprises a tail gas treatment system, wherein the tail gas treatment system comprises a tail gas treatment device, a silencer and a tail gas discharge device which are sequentially connected; the tail gas treatment device is connected with the blade test cavity, and a cooler is arranged on a connecting pipeline of the tail gas treatment device and the blade test cavity.

Preferably, the cooler is connected with the water tank through a pipeline.

Preferably, a cooling water recovery pipeline is further arranged between the blade test cavity and the water tank, and a valve is mounted on the cooling water recovery pipeline.

Preferably, the blade cooling and fatigue testing system further comprises a monitoring system, wherein the monitoring system comprises a flame monitoring device and a blade temperature monitoring system, the flame monitoring device is installed in the combustion chamber, and the blade temperature monitoring system is installed in the blade testing cavity.

The invention also provides a cooling fatigue test method for the deep peak shaving gas turbine blade, which is implemented by adopting the system and is characterized in that: the method comprises the following steps:

the blade test cavity is internally provided with a rotating shaft, firstly, the blade is arranged on the rotating shaft, the connecting end of the rotating shaft is connected with the gear box, then, other test equipment is arranged, and after the test system is verified to be complete and trial-rotated, the blade is adjusted to a test rotating speed through the gear box;

then a main flow compression fan is started, air enters a first pressure stabilizing box after passing through an electric door and a pressure reducing valve, the pressure of an air source is maintained to be stable, and sudden rising and falling of the pressure are prevented; starting an electric heating wire to heat air, and regulating the air flow through a flow controller;

then starting a booster fan, enabling the fuel gas to pass through a pressure regulating valve and an intermediate storage tank in sequence, and regulating the flow by a flow electromagnetic valve; the fuel gas enters the cyclone through the fuel gas nozzle and is fully mixed with air (provided by primary air) in the cyclone;

then starting an ignition device to ignite, burning the fuel gas in a combustion chamber, monitoring the combustion condition by using a flame monitoring device and analyzing the components of the combustion products; during the test, if the primary air volume is insufficient, the secondary flow compression fan is started by the control system to provide an air source for the combustion chamber; if the oxygen content of the flue gas is too high, starting an auxiliary fuel system, enabling the fuel to pass through a swirler and then enter a combustion chamber for combustion, and meanwhile, installing a combustion stabilizer in the combustion chamber to stabilize the combustion; the flue gas after combustion enters a second pressure stabilizing box after passing through an expansion joint, an electromagnetic valve and a pressure regulating valve, then enters a heat exchanger for heat exchange, and the cooled flue gas is subjected to noise reduction by a silencer and then is discharged into a tail gas treatment system; when a blade impingement cooling test is carried out, a first booster fan is started, the air temperature of a temperature controller is set, the pressure and the flow are regulated, a Research-N3 thermal infrared imager is adopted to carry out non-contact measurement on the surface of a blade, and then SmartIRPC software is used for carrying out temperature analysis on a shot blade photo; when a blade air film cooling test is carried out, the blade is replaced by a blade with grooves and small holes on the surface in advance for testing; when the steam fog cooling test is carried out, after the electromagnetic valve is opened, water passes through the water temperature adjusting device, the water flow regulator and the water ejector to carry out the steam fog cooling test. Adjusting the pressure and the flow rate to perform a cooling test according to the test requirements; when the water-cooling test of the blades is carried out, one path of the water outlet of the water pump is directly led to the test cavity of the connected blades, and the water-cooling test of the blades is carried out.

Compared with the prior art, the invention has the following advantages and effects: the test system can be used for the influence of blade cooling tests and different combustion air distribution modes, namely, different tests can be completed by the same test system, and the test system has the advantages of multiple functions, expandability and strong applicability.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Description of reference numerals: a main flow compression fan 1, a secondary flow compression fan 2, a first pressure stabilizing box 2-1, a first booster fan 3, a gas tank 4, an intermediate storage tank 5, an atomizing nozzle 5-2, a combustion-supporting atomizing nozzle 5-3, an auxiliary gas storage tank 6, a main gas storage tank 7, an electric heating wire 7-1, a swirl nozzle 7-2, a heat exchanger 8, a second booster fan 9, a monitoring system 10, a flame monitoring device 10-1 and a blade temperature monitoring system 10-2, the device comprises a cyclone 11, an expansion joint 12, a second voltage stabilizer 13, a supercharging variable frequency water pump 14, a water temperature adjusting device 14-1, a water flow adjuster 14-2, a water injector 14-3, a water pump 15, a water tank 16, a cooler 17, a tail gas treatment device 18, a silencer 19, a tail gas discharge device 20, a cooling water recovery pipeline 21, a combustion chamber 22 and a blade test chamber 23.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.