A turbine test system with energy recovery function and a method of using the same

Abstract

The application provides a turbine test system with energy recovery function and a use method thereof. The turbine test system comprises a first gas storage tank, a first heat exchanger, a power load and a measured turbine test piece. The first gas storage tank is connected with a high-pressure gas source device. The cold end inlet of the first heat exchanger is connected with the first gas storage tank, and the first heat exchanger is used for warming the high-pressure gas provided by the first gas storage tank. The cold end outlet of the first heat exchanger is connected with the inlet of the measured turbine test piece, and the high-temperature and high-pressure gas enters the measured turbine test piece to expand and cool. The power load is a compressor. The gas inlet of the power load is connected with the gas outlet of the measured turbine test piece, and the power load pressurizes and warms the low-temperature and low-pressure gas discharged by the measured turbine test piece. The measured turbine test piece drives the power load to work. Through the above structure, the problem that the output power of the turbine shaft end of the existing turbine test system is directly dissipated through a large-capacity resistance or hydraulic dynamometer, thereby causing a large amount of energy waste can be effectively overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine test in compressed air energy storage, in particular to a turbine test system with energy recovery function and a use method thereof. BACKGROUND

[0002] Compressed air energy storage is a large-scale and long-time energy storage technology, which has important applications in promoting large-scale renewable energy grid connection, achieving peak load shifting of power grid, improving safety and flexibility of power grid, etc. Turbine is a core component of compressed air energy storage system, which converts the stored air internal energy into mechanical energy or electrical energy. The expander of the energy storage system has characteristics such as high load, large flow, and complex flow and heat transfer coupling. Therefore, multiple factors need to be considered in the design of the expander. In order to ensure the system efficiency and reliability, a test bench needs to be built to carry out the aerodynamic and mechanical performance test and detection of turbine components.

[0003] In the existing test system, the turbine shaft end output power is directly dissipated through a large-capacity resistance or hydraulic dynamometer. The above structure will cause a large amount of energy waste. With the increase of the capacity of compressed air energy storage system, the turbine power becomes larger and larger, so there is an urgent need for a test system that can recover the energy of the turbine. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the problem that the turbine shaft end output power of the existing turbine test system is directly dissipated through a large-capacity resistance or hydraulic dynamometer, causing a large amount of energy waste. In order to solve the above problem, the present application provides a turbine test system with energy recovery function, comprising:

[0005] A first gas storage tank is connected in communication with a high-pressure gas source device, used to provide pressure in the first test or to increase the inlet pressure of the measured turbine test piece;

[0006] A first heat exchanger is connected in communication between the cold end inlet of the first heat exchanger and the first gas storage tank, used to warm the high-pressure gas provided by the first gas storage tank to become high-temperature and high-pressure gas; the cold end outlet of the first heat exchanger is connected to the inlet of the measured turbine test piece, and the high-temperature and high-pressure gas enters the measured turbine test piece for expansion and cooling;

[0007] A power load is a compressor for recovering the output power of the measured turbine test piece; the inlet of the power load is connected in communication with the outlet of the measured turbine test piece, the power load pressurizes and warms the low-temperature and low-pressure gas discharged by the measured turbine test piece; and the measured turbine test piece is connected in transmission with the power load through a gear box, and the measured turbine test piece drives the power load to work.

[0008] Optionally, the inlet of the tested turbine is provided with a turbine inlet regulating valve, and the outlet of the tested turbine is provided with a turbine outlet regulating valve.

[0009] The turbine inlet regulating valve and the turbine outlet regulating valve are used to adjust the inlet and outlet pressure of the tested turbine, so as to simulate the operating parameters of the turbine under different actual working conditions.

[0010] Optionally, the turbine test system with energy recovery function further comprises:

[0011] A second heat exchanger, a hot end inlet of the second heat exchanger is communicated with the exhaust outlet of the power load, and the second heat exchanger is used to cool the high-temperature and high-pressure gas discharged by the power load;

[0012] A second gas storage tank, which is communicated with the second heat exchanger, and the second gas storage tank is used to store the high-pressure gas passing through the second heat exchanger.

[0013] Optionally, the second heat exchanger is communicated with the second gas storage tank through a back pressure regulating valve; and / or,

[0014] The exhaust outlet of the power load is communicated with the second heat exchanger through a check valve, and the check valve is used to prevent the high-pressure gas in the second gas storage tank from flowing back to the power load.

[0015] Optionally, the first gas storage tank and the second gas storage tank are communicated through a pipeline provided with a gas storage switch valve and a gas storage check valve;

[0016] When the test is finished, the gas storage switch valve is opened, and when the pressure of the second gas storage tank is higher than that of the first gas storage tank, the second gas storage tank supplies gas to the first gas storage tank to prevent the gas in the second gas storage tank from flowing back to the first gas storage tank.

[0017] Optionally, the turbine test system with energy recovery function further comprises:

[0018] A hot water tank, which is communicated with the first heat exchanger through a hot water pump and a first waterway regulating valve, and is used to heat the high-pressure gas source; the first waterway regulating valve controls the inlet temperature of the tested turbine by adjusting the water quantity;

[0019] A cold water tank, which is communicated with the second heat exchanger through a cold water pump and a second waterway regulating valve, and is used to cool the exhaust gas of the power load and recover heat; the second waterway regulating valve controls the inlet temperature of the second heat exchanger by adjusting the water quantity.

[0020] Optionally, the hot water tank is further provided with a heater, which is used to increase the water temperature in the first test or to increase the water temperature in the hot water tank according to the intake temperature requirement of the tested turbine test piece;

[0021] The inlet of the hot water pump is connected with the bottom of the hot water tank, and the inlet of the cold water pump is connected with the bottom of the cold water tank.

[0022] Optionally, a switch valve is further arranged between the first gas storage tank and the high-pressure gas source device; and / or,

[0023] The gas outlet position of the power load is further provided with a surge relief valve, which is used to balance the pressure and prevent surge when the power load enters the surge state; and / or,

[0024] A torque meter is further arranged between the tested turbine test piece and the gear box, which is used to measure the output torque of the tested turbine test piece; and / or,

[0025] An emergency cut-off valve is further arranged on the connecting pipeline between the first gas storage tank and the first heat exchanger, which is used to cut off the high-pressure gas source in abnormal conditions.

[0026] Optionally, the turbine test system is a closed circulation system, which is used to carry out performance tests of air, carbon dioxide and natural gas working substances.

[0027] A use method of a turbine test system, comprising the following steps:

[0028] S1, the switch valve is closed, and the high-pressure gas in the first gas storage tank enters the first heat exchanger to become high-temperature and high-pressure gas after being heated;

[0029] S2, the high-temperature and high-pressure gas enters the tested turbine test piece to be expanded and cooled after being adjusted in pressure by the turbine intake port adjusting valve;

[0030] S3, the low-temperature and low-pressure gas discharged from the tested turbine test piece enters the power load to be pressurized and heated after being adjusted in pressure by the turbine gas outlet adjusting valve;

[0031] In the above process, the tested turbine test piece is connected with the power load in transmission through the gear box, and the tested turbine test piece drives the power load to work, so as to recover the shaft power of the tested turbine test piece;

[0032] S4, the high-temperature and high-pressure gas discharged from the power load enters the second heat exchanger to be cooled through the check valve;

[0033] S5, the high-pressure gas passing through the back pressure adjusting valve after the second heat exchanger is stored in the second gas storage tank.

[0034] S6, after the experiment, open the gas storage switch valve, through the second gas tank to the first gas tank to prepare for the next test.

[0035] The technical scheme of the present application has the following advantages:

[0036] 1. The turbine test system with energy recovery function provided by the present application comprises:

[0037] The first gas tank is connected with the high-pressure gas source device, and is used to provide pressure in the first test or to increase the inlet pressure of the measured turbine test piece;

[0038] The cold end inlet of the first heat exchanger is connected with the first gas tank, and is used to heat the high-pressure gas provided by the first gas tank to become high-temperature and high-pressure gas; the cold end outlet of the first heat exchanger is connected with the inlet of the measured turbine test piece, and the high-temperature and high-pressure gas enters the measured turbine test piece to expand and cool down;

[0039] The power load is a compressor used to recover the output power of the measured turbine test piece; the inlet of the power load is connected with the outlet of the measured turbine test piece, and the power load pressurizes and heats the low-temperature and low-pressure gas discharged by the measured turbine test piece; and the measured turbine test piece is connected with the power load in transmission through a gear box, and the measured turbine test piece drives the power load to work.

[0040] In the prior art turbine test system, the turbine shaft end output power is directly dissipated through a large-capacity resistance or hydraulic dynamometer, resulting in a large amount of energy waste. In the present application, the power load is driven by the measured turbine test piece to compress gas. The above design can effectively recover the output power of the measured turbine test piece, and supplement the heat source and high-pressure gas source for the turbine test, thereby improving the energy utilization rate.

[0041] 2. The turbine test system with energy recovery function provided by the present application, wherein the inlet of the measured turbine test piece is provided with a turbine inlet adjusting valve, and the outlet of the measured turbine test piece is provided with a turbine outlet adjusting valve.

[0042] The turbine inlet adjusting valve and the turbine outlet adjusting valve are used to adjust the inlet and outlet pressures of the measured turbine test piece, so as to simulate the operating parameters of the turbine under different actual working conditions.

[0043] In the present application, the outlet pressure is atmospheric pressure, a turbine inlet adjusting valve is arranged at the inlet of the turbine test piece, and a turbine outlet adjusting valve is arranged at the outlet of the turbine test piece. The turbine inlet adjusting valve and the turbine outlet adjusting valve cooperate with the heater to effectively simulate different working conditions of the turbine, so that the operating performance of the turbine under different actual working conditions is tested, and the turbine test system has the advantage of wide test range.

[0044] 3. The turbine test system with energy recovery function provided by the present application further comprises:

[0045] A second heat exchanger, a hot end inlet of the second heat exchanger is communicated with the exhaust port of the power load, and the second heat exchanger is used for cooling the high-temperature and high-pressure gas discharged by the power load;

[0046] A second gas storage tank, which is communicated with the second heat exchanger, is used for storing the high-pressure gas passing through the second heat exchanger.

[0047] In the present application, the exhaust gas discharged by the power load is cooled and heat is recovered through the second heat exchanger, so that the energy loss of the turbine test system is further reduced.

[0048] 4. The turbine test system with energy recovery function provided by the present application further comprises:

[0049] A hot water tank, which is communicated with the first heat exchanger through a hot water pump and a first waterway adjusting valve, is used for heating the high-pressure gas source; the first waterway adjusting valve controls the inlet temperature of the turbine test piece by adjusting the water quantity;

[0050] A cold water tank, which is communicated with the second heat exchanger through a cold water pump and a second waterway adjusting valve, is used for cooling the exhaust gas of the power load and recovering heat; the second waterway adjusting valve controls the inlet temperature of the second heat exchanger by adjusting the water quantity.

[0051] In the present application, the hot water tank with the first waterway adjusting valve can effectively simulate different working conditions of the turbine. In addition, the exhaust gas of the power load is cooled and heat is recovered through the cold water tank, so that the energy loss of the turbine test system is reduced.

[0052] 5. The turbine test system with energy recovery function provided by the present application, a heater is further arranged in the hot water tank, the heater is used for increasing the water temperature in the first test, or is used for increasing the water temperature in the hot water tank according to the inlet temperature requirement of the turbine test piece; the inlet of the hot water pump is connected with the bottom of the hot water tank, and the inlet of the cold water pump is connected with the bottom of the cold water tank.

[0053] In the present application, by additionally arranging a heater in the hot water tank, the heater can increase the water temperature in the hot water tank according to the test requirement, thereby further increasing the test range of the turbine test system.

[0054] 6. The use method of the turbine test system provided by the present application, comprising the following steps:

[0055] S1, closing the switch valve, the high-pressure gas in the first gas tank enters the first heat exchanger to become high-temperature high-pressure gas after being heated;

[0056] S2, the high-temperature high-pressure gas enters the measured turbine test piece to expand and cool after being adjusted by the turbine inlet gas regulating valve;

[0057] S3, the low-temperature low-pressure gas discharged by the measured turbine test piece enters the power load to be pressurized and heated after being adjusted by the turbine outlet gas regulating valve;

[0058] In the above process, the measured turbine test piece is connected in transmission with the power load through the gear box, and the measured turbine test piece drives the power load to work to recover the shaft power of the measured turbine test piece;

[0059] S4, the high-temperature high-pressure gas discharged by the power load enters the second heat exchanger to be cooled through the check valve;

[0060] S5, the high-pressure gas passing through the back pressure regulating valve after the second heat exchanger is stored in the second gas tank;

[0061] S6, after the experiment is finished, the gas storage switch valve is opened, and the first gas tank is replenished with gas through the second gas tank to prepare for the next test.

[0062] The use method of the turbine test system in the present application is realized based on the turbine test system with energy recovery function, so it has all the advantages of the turbine test system. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0064] Figure 1 It is a schematic diagram of the internal structure of the turbine test system with energy recovery function provided in the present application.

[0065] Explanation of reference numerals in the attached figures:

[0066] 1-First gas storage tank; 2-High-pressure gas source device; 3-Test turbine specimen; 4-First heat exchanger; 5-Power load; 6-Gearbox; 7-Turbine inlet regulating valve; 8-Turbine outlet regulating valve; 9-Second heat exchanger; 10-Second gas storage tank; 11-Back pressure regulating valve; 12-Check valve; 13-Gas storage switch valve; 14-Gas storage one-way valve; 15-Hot water tank; 16-Hot water pump; 17-First water circuit regulating valve; 18-Cold water tank; 19-Cold water pump; 20-Second water circuit regulating valve; 21-Heater; 22-Surge relief valve; 23-Torque meter; 24-Emergency shut-off valve; 25-Switch valve. Detailed Implementation

[0067] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0068] Example 1

[0069] A turbine test system with energy recovery function is used to conduct performance tests on air working fluids.

[0070] like Figure 1 As shown, the turbine testing system includes:

[0071] The first gas storage tank 1 is connected to the high-pressure gas source device 2 and is used to provide pressure during the first test or to increase the inlet pressure of the turbine test piece 3 under test; a switch valve 25 is also provided between the first gas storage tank 1 and the high-pressure gas source device 2.

[0072] The first heat exchanger 4 has its cold end inlet connected to the first gas storage tank 1, which is used to heat up the high-pressure gas provided by the first gas storage tank 1 to turn it into a high-temperature and high-pressure gas; the cold end outlet of the first heat exchanger 4 is connected to the inlet of the turbine test piece 3 under test, and the high-temperature and high-pressure gas enters the turbine test piece 3 under test for expansion and cooling.

[0073] The second heat exchanger 9 has its hot end inlet connected to the exhaust port of the power load 5. The second heat exchanger 9 is used to cool down the high-temperature and high-pressure gas discharged from the power load 5.

[0074] A second gas tank 10 is connected with the second heat exchanger 9, and the second gas tank 10 is used for storing high-pressure gas passing through the second heat exchanger 9; the second heat exchanger 9 is connected with the second gas tank 10 through a back pressure regulating valve 11; in the embodiment, the first gas tank 1 and the second gas tank 10 are connected through a pipeline provided with a gas storage switch valve 13 and a gas storage check valve 14; when the test is finished, the gas storage switch valve 13 is opened, and when the pressure of the second gas tank 10 is higher than that of the first gas tank 1, the second gas tank 10 supplies gas to the first gas tank 1 to prevent the gas in the second gas tank 10 from flowing back to the first gas tank 1;

[0075] The power load 5 is a compressor used for recovering the output power of the tested turbine 3; the air inlet of the power load 5 is connected with the air outlet of the tested turbine 3, the power load 5 pressurizes and warms the low-temperature and low-pressure gas discharged by the tested turbine 3; and the tested turbine 3 is connected with the power load 5 in transmission through a gear box 6, and the tested turbine 3 drives the power load 5 to work.

[0076] In order to simulate the operating parameters of the turbine under different actual working conditions, the air inlet of the tested turbine 3 is provided with a turbine air inlet regulating valve 7, and the air outlet of the tested turbine 3 is provided with a turbine air outlet regulating valve 8; the turbine air inlet regulating valve 7 and the turbine air outlet regulating valve 8 are used for adjusting the inlet and outlet pressures of the tested turbine 3.

[0077] In order to prevent the high-pressure gas in the second gas tank 10 from flowing back to the power load 5, in the application, the air outlet of the power load 5 is connected with the second heat exchanger 9 through a check valve 12.

[0078] The turbine test system in the embodiment further comprises:

[0079] A hot water tank 15 is connected with the first heat exchanger 4 through a hot water pump 16 and a first waterway regulating valve 17, and is used for heating the high-pressure gas source; the first waterway regulating valve 17 controls the inlet air temperature of the tested turbine 3 by adjusting the water quantity; the hot water tank 15 is further provided with a heater 21, which is used for increasing the water temperature in the first test, or is used for increasing the water temperature in the hot water tank 15 according to the inlet air temperature requirement of the tested turbine 3;

[0080] A cold water tank 18 is connected to the second heat exchanger 9 via a cold water pump 19 and a second water circuit regulating valve 20. The cold water tank 18 is used to cool the exhaust gas from the power load 5 and recover heat. The second water circuit regulating valve 20 controls the inlet temperature of the second heat exchanger 9 by adjusting the water flow. The inlet of the hot water pump 16 is connected to the bottom of the hot water tank 15, and the inlet of the cold water pump 19 is connected to the bottom of the cold water tank 18.

[0081] In order to balance the pressure and prevent surge, an anti-surge valve 22 is also provided at the outlet of the power load 5. The anti-surge valve 22 is used to effectively balance the pressure and prevent surge when the power load 5 enters the surge state.

[0082] In order to measure the output torque of the turbine test specimen 3, a torque meter 23 is also provided between the turbine test specimen 3 and the gearbox 6 in this embodiment.

[0083] In order to enable emergency shut-off of the high-pressure gas source in abnormal situations, an emergency shut-off valve 24 is also provided on the connecting pipeline between the first gas storage tank 1 and the first heat exchanger 4.

[0084] A method of using a turbine testing system includes the following steps:

[0085] S1, close the switch valve 25, and the high-pressure gas in the first gas storage tank 1 enters the first heat exchanger 4 through the emergency shut-off valve 24 and becomes high-temperature and high-pressure gas after being heated.

[0086] S2, the high-temperature and high-pressure gas enters the turbine test piece 3 under test after the pressure is adjusted by the turbine inlet regulating valve 7 to expand and cool down;

[0087] S3, the low-temperature and low-pressure gas discharged from the turbine test piece 3 is pressurized and heated after the pressure is adjusted by the turbine outlet regulating valve 8.

[0088] In the above process, the turbine test piece 3 is connected to the power load 5 through the gearbox 6, and the turbine test piece 3 drives the power load 5 to work in order to recover the shaft power of the turbine test piece 3.

[0089] S4, the high-temperature and high-pressure gas discharged from the power load 5 enters the second heat exchanger 9 through the check valve 12 to cool down;

[0090] S5, the high-pressure gas after passing through the second heat exchanger 9 is stored in the second gas storage tank 10 after passing through the back pressure regulating valve 11;

[0091] S6, after the experiment, open the gas storage switch valve 13, through the second gas tank 10 to the first gas tank 1 gas, to prepare to carry out the next test.

[0092] Of course, the embodiment of the measured turbine test piece 3 inlet and outlet valve set does not make specific limitation, in other embodiments, the measured turbine test piece 3 inlet and outlet and above-mentioned turbine inlet regulating valve 7 and turbine outlet regulating valve 8 are not set.

[0093] Of course, the embodiment of the first heat exchanger 4 and the second heat exchanger 9 specific structure does not make specific limitation, in other embodiments, it can also be through the hot water tank 15 and cold water tank 18, for example, heating wire, air cooling and other ways to achieve heat transfer.

[0094] Of course, the embodiment of the power load 5 exhaust port whether set check valve 12 does not make specific limitation, in other embodiments, the heat exchanger group can also use air cooling and other cooling methods.

[0095] Of course, the embodiment of the hot water tank 15 in the liquid heating method does not make specific limitation, in other embodiments, it can also be through the recovery of other equipment heat source to achieve liquid heating.

[0096] Of course, the embodiment of the turbine test system application of the working medium object does not make specific limitation, in other embodiments, the turbine test system for closed cycle system, used to carry out the performance test of carbon dioxide, natural gas working medium.

[0097] Obviously, the above-mentioned embodiment is only for the purpose of illustration, and not limited. For those skilled in the art, on the basis of the above description can also be made in other different forms of changes or changes. Here does not need to and can not be all the embodiments to be exhausted. The obvious changes or changes derived from still within the scope of the present invention.

Claims

1. A turbine test system having an energy recovery function, characterized by comprising: The utility model relates to a kind of turbine test device, comprising: First gas tank (1), the first gas tank (1) is communicated with high-pressure gas source device (2), for providing pressure in first time test, or for increasing the inlet pressure of the turbine test piece (3) to be measured; First heat exchanger (4), the cold end inlet of the first heat exchanger (4) is communicated with the first gas tank (1), for providing high-pressure gas of the first gas tank (1) with temperature, to become high-temperature high-pressure gas;The cold end outlet of the first heat exchanger (4) is connected with the inlet of the turbine test piece (3) to be measured, and the high-temperature high-pressure gas enters the turbine test piece (3) to be measured and carries out expansion cooling; Power load (5), for recovering the compressor of the output power of the turbine test piece (3) to be measured;The gas inlet of the power load (5) is communicated with the gas outlet of the turbine test piece (3) to be measured, and the power load (5) pressurizes and heats the low-temperature low-pressure gas discharged by the turbine test piece (3) to be measured;And the turbine test piece (3) is connected with the power load (5) through gear box (6) transmission, and the turbine test piece (3) drives the power load (5) to work; The gas inlet of the turbine test piece (3) to be measured is equipped with turbine gas inlet regulating valve (7), and the gas outlet of the turbine test piece (3) to be measured is equipped with turbine gas outlet regulating valve (8); The turbine gas inlet regulating valve (7) and the turbine gas outlet regulating valve (8) are used to adjust the inlet and outlet pressure of the turbine test piece (3) to be measured, so as to simulate the operating parameters of turbine under different actual working conditions; Second heat exchanger (9), the hot end inlet of the second heat exchanger (9) is communicated with the exhaust port of the power load (5), and the second heat exchanger (9) is used for cooling the high-temperature high-pressure gas discharged by the power load (5);Second gas tank (10) is communicated with the second heat exchanger (9), and the second gas tank (10) is used for storing high-pressure gas through the second heat exchanger (9); The first gas tank (1) and the second gas tank (10) are communicated by pipeline provided with gas storage switch valve (13) and gas storage check valve (14);When test is finished, the gas storage switch valve (13) is opened, when the pressure of the second gas tank (10) is higher than the first gas tank (1), the second gas tank (10) is replenished to the first gas tank (1) to prevent the gas in the second gas tank (10) from flowing back to the first gas tank (1); Hot water tank (15), the hot water tank (15) is communicated with the first heat exchanger (4) by hot water pump (16) and first waterway regulating valve (17), for heating high-pressure gas source;The first waterway regulating valve (17) controls the inlet temperature of the turbine test piece (3) to be measured by adjusting water quantity; A cold water tank (18) is connected with the second heat exchanger (9) through a cold water pump (19) and a second water circuit regulating valve (20), and is used for cooling and recovering heat of exhaust gas of the power load (5); the second water circuit regulating valve (20) controls the water inlet side temperature of the second heat exchanger (9) by regulating water quantity.

2. The turbine test system with energy recovery function according to claim 1, characterized in that, The second heat exchanger (9) is connected with the second gas storage tank (10) through a back pressure regulating valve (11); and / or, An exhaust port of the power load (5) is connected with the second heat exchanger (9) through a check valve (12), and the check valve (12) is used for preventing high pressure gas in the second gas storage tank (10) from flowing back to the power load (5).

3. The turbine test system with energy recovery function according to claim 1, characterized in that, A heater (21) is further arranged in the hot water tank (15), and the heater (21) is used for increasing water temperature in the hot water tank (15) in the first test, or is used for increasing water temperature in the hot water tank (15) according to the air inlet temperature requirement of the measured turbine test piece (3); An inlet of the hot water pump (16) is connected with a bottom of the hot water tank (15), and an inlet of the cold water pump (19) is connected with a bottom of the cold water tank (18).

4. The turbine test system with energy recovery function according to claim 1, wherein, A switch valve (25) is further arranged between the first gas storage tank (1) and the high pressure gas source device (2); and / or, An anti-surge valve (22) is further arranged at a gas outlet position of the power load (5), and the anti-surge valve (22) is used for balancing pressure to prevent surge when the power load (5) enters a surge state; and / or, A torque meter (23) is further arranged between the measured turbine test piece (3) and the gear box (6), and the torque meter (23) is used for measuring output torque of the measured turbine test piece (3); and / or, An emergency cut-off valve (24) is further arranged on a connecting pipeline between the first gas storage tank (1) and the first heat exchanger (4), and the emergency cut-off valve (24) is used for cutting off the high pressure gas source in an abnormal condition.

5. The turbine test system with energy recovery function according to claim 1, characterized in that, The turbine test system is a closed cycle system, and is used for developing performance tests of air, carbon dioxide and natural gas working substances.

6. A method of using a turbine test system with an energy recovery function according to any one of claims 1 to 5, characterized by, The method comprises the following steps: S1, closing the switch valve (25), high pressure gas in the first gas storage tank (1) enters the first heat exchanger (4) to become high temperature and high pressure gas after being heated; S2, the high temperature and high pressure gas enters the measured turbine test piece (3) to be expanded and cooled after being regulated in pressure by the turbine air inlet regulating valve (7); S3, low temperature and low pressure gas discharged by the measured turbine test piece (3) enters the power load (5) to be pressurized and heated after being regulated in pressure by the turbine air outlet regulating valve (8); The measured turbine test piece (3) is connected with the power load (5) in transmission through the gear box (6), and the measured turbine test piece (3) drives the power load (5) to work, so as to recover shaft power of the measured turbine test piece (3); S4, the high-temperature and high-pressure gas discharged by the power load (5) enters the second heat exchanger (9) to be cooled through the check valve (12); S5, the high-pressure gas passing through the second heat exchanger (9) is stored in the second gas storage tank (10) through the back pressure regulating valve (11); S6, after the experiment is finished, the gas storage switch valve (13) is opened, and the first gas storage tank (1) is supplemented with gas through the second gas storage tank (10) to prepare for the next test.

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