Gas turbine intake cooling system performance test system and method

Abstract

The application discloses a kind of gas turbine intake cooling system efficiency test system and method, belong to the field of combined cycle unit efficiency test, including power generation system, intake cooling system and data processing system, intake cooling system is connected with power generation system by output air flow channel, and data processing system is electrically connected with the test measuring point arranged;Desired parameter is obtained, first cut off gas turbine intake cooling system, carry out benchmark condition test, collect benchmark condition test data, meet the requirement after commissioning gas turbine intake cooling system, carry out efficiency test condition test, record efficiency test condition test data;According to test data, calculate gas turbine intake cooling system efficiency index.The application can accurately test the thermal efficiency of system, so as to judge whether the efficiency of gas turbine intake cooling system reaches the relevant design index, and the measurement system is simple, with good engineering implementation significance.

Description

Technical Field

[0001] This invention belongs to the field of combined cycle power generation technology, and relates to a gas turbine intake cooling system performance testing system and method. Background Technology

[0002] In the high temperatures of summer, combined cycle power plants commonly experience reduced output and decreased operational efficiency. Upgrading combined cycle power plants by adding gas turbine inlet cooling systems can effectively solve this common problem. Therefore, in recent years, an increasing number of combined cycle power plants in southern China are undergoing or preparing to upgrade their gas turbine inlet cooling systems.

[0003] Accurate measurement of the combined cycle unit's efficiency after the gas turbine intake cooling system modification is crucial for determining the success of the modification and calculating its economic benefits. Furthermore, changes in the combined cycle unit's efficiency can also reflect the quality and level of the project, serving as an important indicator for evaluating whether the gas turbine intake cooling system meets relevant standards.

[0004] Currently, the existing technology, specifically the "Test Procedure for the Performance of Gas Turbine Inlet Cooling System," obtains the performance of the gas turbine inlet cooling system by measuring its boundary parameters (including air-side and cooling water-side parameters). However, this method requires measuring airflow, making the testing complex and subject to significant uncertainty. Furthermore, this method cannot directly assess the specific performance indicators of the combined cycle unit after the gas turbine inlet cooling system has been put into operation. No existing technology provides testing methods for the gas turbine inlet cooling system and the performance indicators of the combined cycle unit after commissioning. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that the existing technology for obtaining the performance of a gas turbine intake cooling system is complicated and cannot directly evaluate the specific performance indicators of the combined cycle after the gas turbine intake cooling system is put into operation. The invention provides a gas turbine intake cooling system performance testing system and method.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention proposes a performance testing system for a gas turbine intake cooling system, comprising a power generation system, a gas turbine intake system, and a data processing system;

[0008] The gas turbine intake system includes a heat exchanger and a refrigeration system. A first measuring point for measuring pressure and temperature is installed on the air flow channel in front of the heat exchanger; a second measuring point for measuring temperature is installed on the air flow channel behind the heat exchanger; the power generation system is connected to the other end of the rear air flow channel; the cooling water inlet of the heat exchanger is connected to the outlet of the refrigeration system, and a third measuring point for measuring the inlet water temperature and flow rate is installed on the connecting pipe; the cooling water outlet of the heat exchanger is connected to the return water outlet of the refrigeration system, and a fourth measuring point for measuring the return water temperature is installed on the connecting pipe; a fifth measuring point for measuring electrical power is installed in the refrigeration system.

[0009] The first, second, third, fourth, and fifth measurement points are all connected to the data processing system.

[0010] Preferably, the power generation system includes a gas turbine, a gas turbine generator, a steam turbine generator, a waste heat boiler, and a steam turbine. A natural gas flow measurement point is installed on the natural gas inlet pipe of the gas turbine. Natural gas enters the gas turbine for combustion and power generation. The gas turbine is connected to the gas turbine generator, and a gas turbine power measurement point is installed on the gas turbine generator. The flue gas generated by the gas turbine enters the waste heat boiler to generate steam. The steam enters the steam turbine for expansion and power generation. The steam turbine is connected to the steam turbine generator, and a steam turbine power measurement point is installed on the steam turbine generator.

[0011] Preferably, the electrical power of the gas turbine generator and the steam turbine generator is measured using a power transmitter with an accuracy class of not less than 0.2; the natural gas flow rate is measured using a flow transmitter with an accuracy class of not less than 0.5.

[0012] Preferably, the first measurement point includes an atmospheric pressure measurement point, a first temperature measurement point, and a second measurement point;

[0013] The second measurement point includes the third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth temperature measurement points;

[0014] The third measurement point includes the cooling water inlet shut-off valve, the cooling water inlet temperature measurement point, and the cooling water flow measurement point;

[0015] The fourth measurement point includes the cooling water outlet shut-off valve and the cooling water return temperature measurement point;

[0016] The fifth measurement point includes several auxiliary machine power measurement points.

[0017] Preferably, the air temperatures before and after the heat exchanger are measured using a platinum resistance thermometer with an accuracy class of not less than A.

[0018] The inlet and outlet temperatures of the cooling water are measured using thermocouples with an accuracy class of no less than Industrial Class I.

[0019] Atmospheric pressure is measured using a pressure transmitter with an accuracy class of not less than 0.075.

[0020] Cooling water flow rate is measured using a flow measurement transmitter with an accuracy class of not less than 1.

[0021] The power of auxiliary electromechanical equipment is measured using a power transmitter with an accuracy class of not less than 1.

[0022] The present invention proposes a method for testing the performance of a gas turbine inlet cooling system, comprising the following steps:

[0023] After the temperature difference measured at the first and second measuring points of the heat exchanger fluctuates by less than 0.2℃ and remains stable for a certain period of time, data from the power generation system and the gas turbine intake system are recorded.

[0024] The data from the power generation system and the gas turbine intake system are sent to the data processing system to obtain the unit's air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the generator, and system response time.

[0025] The unit parameters are corrected to obtain the corrected air temperature drop value, corrected electric power, corrected gas consumption rate, electric power increase value, and gas consumption rate decrease value, thereby realizing the performance test of the gas turbine intake cooling system.

[0026] Preferably, the temperature drop of the test air is ΔT t The calculation method is as follows:

[0027]

[0028] Among them, T in,i T represents the measured inlet air temperature of the i-th heat exchanger. out,i is the measured air temperature at the outlet of the i-th heat exchanger; m is the number of air temperature measuring points at the inlet of the heat exchanger; n is the number of air temperature measuring points at the outlet of the heat exchanger.

[0029] Refrigeration system cooling capacity Q t The calculation method is as follows:

[0030] Q t =C p ×(T wout -T win )×F w

[0031] Among them, C p T is the specific heat capacity of water. wout,i This refers to the measured temperature of the cooling water outlet from the heat exchanger; T win,i This refers to the measured value of the cooling water inlet temperature of the heat exchanger; F w This is the measured value of cooling water flow rate;

[0032] Test power P t The calculation method is as follows:

[0033] P t =P gt +P st

[0034] Among them, P gt P represents the measured electrical power of the gas turbine generator. st This refers to the measured electrical power of the steam turbine generator.

[0035] Test generator power consumption rate b t The calculation method is as follows:

[0036]

[0037] Among them, F t This is a measurement of natural gas flow rate.

[0038] Preferably, the air temperature drop correction value ΔT c The calculation method is as follows:

[0039]

[0040] Where, ΔT t Q is the temperature drop of the test air; Q0 is the design value of the heat exchanger's heat exchange capacity; Q t This refers to the test value of the heat exchanger's heat transfer capacity.

[0041] Corrected power P net,c The calculation method is as follows:

[0042]

[0043] Where p0 is the measured atmospheric pressure under the baseline operating condition; T0 is the average measured atmospheric temperature under the baseline operating condition; RH0 is the measured atmospheric pressure under the baseline operating condition; p1 is the measured atmospheric pressure under the performance test condition; T1 is the average measured atmospheric temperature under the performance test condition; RH1 is the measured atmospheric humidity under the performance test condition; P ai C represents the measured power of the i-th auxiliary unit in the refrigeration system. P (p) is the correction curve for atmospheric pressure on the electrical power of the combined cycle unit; C P (T) is the correction curve for the electrical power of the combined cycle unit based on atmospheric temperature; C P (RH) is the formula for the correction curve of atmospheric humidity on the electrical power of combined cycle units;

[0044] Corrected gas consumption rate b net,c The calculation method is as follows:

[0045]

[0046] Among them, C HR (p) is the correction curve for atmospheric pressure on the heat rate or heat consumption of the combined cycle unit; C HR (T) is the correction curve for the combined cycle unit's heat rate or heat consumption based on atmospheric temperature; C HR (RH) is the correction curve for the heat rate or heat consumption of a combined cycle unit due to atmospheric humidity.

[0047] The calculation method for the power increase ΔP is as follows:

[0048] ΔP=P net,c -P t

[0049] Among them, P t For the test electrical power;

[0050] The calculation method for the gas consumption rate reduction Δb is as follows:

[0051] Δb=b t -b net,c

[0052] Among them, b t To test the power consumption rate of the generator.

[0053] Preferably, the system response time Δt is calculated as follows:

[0054] Δt=t2-t1

[0055] Where t1 is the time to open the cooling water inlet shut-off valve and the cooling water return shut-off valve, and t2 is the time when the temperature difference between the front and back of the heat exchanger fluctuates less than 0.2℃.

[0056] This invention proposes a method for testing the performance of a gas turbine inlet cooling system, comprising:

[0057] The data acquisition module is used to record data of the power generation system and the gas turbine intake system after the fluctuation of the temperature difference measured at the first and second measurement points of the heat exchanger is less than 0.2℃ and is maintained for a certain period of time.

[0058] The data processing module is used to send data from the power generation system and the gas turbine intake system to the data processing system to obtain the unit air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the generator, and system response time.

[0059] The parameter correction module is used to correct the unit parameters, obtain the corrected air temperature drop value, the corrected electric power, the corrected gas consumption rate, the increase in electric power and the decrease in gas consumption rate, and realize the performance test of the gas turbine intake cooling system.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] This invention proposes a performance testing system for a gas turbine intake cooling system. The system connects the cooling water inlet of the heat exchanger to the outlet of the chiller, and the cooling water outlet of the heat exchanger to the return water outlet of the chiller. A first measuring point is installed in the airflow channel before the heat exchanger, a second measuring point is installed in the airflow channel after the heat exchanger, a third and a fourth measuring point are installed on the connecting pipeline, and a fifth measuring point is installed in the refrigeration system. By connecting these five measuring points to a data processing system, accurate measurement of water-side and electrical-side parameters allows for the rapid and accurate determination of the performance parameters of the gas turbine intake cooling system. This is of great significance for evaluating the actual effectiveness of gas turbine intake cooling system retrofit projects. Therefore, the testing system proposed in this invention can solve the problems existing in the prior art.

[0062] Furthermore, the power of the gas turbine generator and the steam turbine generator is measured using a power transmitter with an accuracy class of not less than 0.2; the natural gas flow is measured using a flow transmitter with an accuracy class of not less than 0.5, to ensure that the measurement uncertainty of the power increase value of the combined cycle unit is not higher than ±0.5% and the measurement uncertainty of the gas consumption rate reduction value is not higher than ±1.0%.

[0063] Furthermore, the air temperatures before and after the heat exchanger are measured using platinum resistance thermometers with an accuracy class of at least A; the cooling water inlet and outlet temperatures are measured using thermocouples with an accuracy class of at least Industrial Class I; atmospheric pressure is measured using pressure transmitters with an accuracy class of at least 0.075; cooling water flow rate is measured using flow transmitters with an accuracy class of at least 1; and auxiliary power is measured using power transmitters with an accuracy class of at least 1. These measuring instruments ensure that the measurement uncertainty of the combined cycle unit's power increase is no higher than ±0.5%, and the measurement uncertainty of the gas consumption rate reduction is no higher than ±1.0%.

[0064] This invention proposes a method for testing the performance of a gas turbine inlet cooling system. By accurately measuring water-side and electrical-side parameters, it can quickly and accurately obtain the performance parameters of the gas turbine inlet cooling system. Compared with existing technologies, it eliminates the need to measure air-side parameters, is simpler to operate, and has less measurement uncertainty. Simultaneously, by combining this method with the synchronous measurement of the boundary parameters of the combined cycle unit, the performance indicators of the combined cycle unit after the gas turbine inlet cooling system has been put into operation can be directly obtained. This is of great significance for evaluating the actual effect of gas turbine inlet cooling system retrofit projects.

[0065] This invention proposes a gas turbine inlet cooling system performance testing system. By dividing the system into a data acquisition module, a data processing module, and a parameter calibration module, it enables performance testing of the gas turbine inlet cooling system. The modular design ensures that each module is independent, facilitating unified management of all modules. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a structural diagram of the gas turbine intake cooling system performance testing system of the present invention.

[0068] Figure 2 This is a flowchart of the performance test of the gas turbine intake cooling system of the present invention.

[0069] Figure 3 This is a diagram of the performance testing system for the gas turbine inlet cooling system of the present invention.

[0070] The components include: heat exchanger H2, refrigeration system H3, data processing system C1, gas turbine B1, gas turbine generator E1, steam turbine generator E2, waste heat boiler H1, steam turbine B2, natural gas flow measurement point F1, gas turbine power measurement point W11, steam turbine power measurement point W12, atmospheric pressure measurement point P1, first temperature measurement point T1, second temperature measurement point T2, third temperature measurement point T3, fourth temperature measurement point T4, fifth temperature measurement point T5, sixth temperature measurement point T6, seventh temperature measurement point T7, eighth temperature measurement point T8, ninth temperature measurement point T9, tenth temperature measurement point T8, cooling water inlet shut-off valve V1, cooling water inlet temperature measurement point T9, cooling water flow measurement point F2, cooling water outlet shut-off valve V2, and cooling water return temperature measurement point T10. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0072] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0073] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0074] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0075] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0076] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0077] The present invention will now be described in further detail with reference to the accompanying drawings:

[0078] This invention proposes a performance testing system for a gas turbine inlet cooling system, such as... Figure 1 As shown, it includes a power generation system, a gas turbine intake system, and a data processing system;

[0079] The power generation system includes a gas turbine B1. A natural gas flow measuring point F1 is installed on the natural gas inlet pipeline of the gas turbine B1. Natural gas enters the gas turbine B1 for combustion and power generation. The gas turbine B1 is connected to the gas turbine generator E1 via a shaft. A gas turbine power measuring point W11 is installed on the gas turbine generator E1. The flue gas generated by the gas turbine B1 enters the waste heat boiler H1 to generate steam. The steam enters the steam turbine B2 for expansion and power generation. The steam turbine B2 is connected to the steam turbine generator E2 via a shaft. A steam turbine power measuring point W12 is installed on the steam turbine generator E2.

[0080] Among them, the electrical power of gas turbine generator E1 and steam turbine generator E2 is measured using a power transmitter with an accuracy class of not less than 0.2; the natural gas flow rate is measured using a flow transmitter with an accuracy class of not less than 0.5.

[0081] The gas turbine intake system includes a heat exchanger H2 and a refrigeration system H3. A first measuring point for measuring pressure and temperature is installed on the air flow channel in front of the heat exchanger H2; a second measuring point for measuring temperature is installed on the air flow channel behind the heat exchanger H2; the power generation system is connected to the other end of the rear air flow channel, i.e., the gas turbine B1 of the power generation system is connected to the other end of the rear air flow channel; the cooling water inlet of the heat exchanger H2 is connected to the outlet of the refrigeration system H3, and a third measuring point for measuring the inlet water temperature and flow rate is installed on the connecting pipe; the cooling water outlet of the heat exchanger H2 is connected to the return water outlet of the refrigeration system H3, and a fourth measuring point for measuring the return water temperature is installed on the connecting pipe; a fifth measuring point for measuring electrical power is installed in the refrigeration system H3; the first, second, third, fourth, and fifth measuring points are all connected to the data processing system C1.

[0082] The first measurement point includes atmospheric pressure measurement point P1, first temperature measurement point T1, and second measurement point T2;

[0083] The second measurement points include the third temperature measurement point T3, the fourth temperature measurement point T4, the fifth temperature measurement point T5, the sixth temperature measurement point T6, the seventh temperature measurement point T7, the eighth temperature measurement point T8, the ninth temperature measurement point T9, and the tenth temperature measurement point T8.

[0084] The third measurement point includes cooling water inlet shut-off valve V1, cooling water inlet temperature measuring point T9, and cooling water flow measuring point F2;

[0085] The fourth measurement point includes the cooling water outlet shut-off valve V2 and the cooling water return temperature measurement point T10;

[0086] The fifth measurement point includes several auxiliary machine power measurement points, such as the first auxiliary machine power measurement point W21 to the nth auxiliary machine power measurement point W2n, which are used to measure the power of n auxiliary machines in the refrigeration system H3.

[0087] Specifically, the air temperatures before and after heat exchanger H2 are measured using platinum resistance thermometers with an accuracy class of no less than A; the inlet and outlet temperatures of cooling water are measured using thermocouples with an accuracy class of no less than Industrial Class I; atmospheric pressure is measured using pressure transmitters with an accuracy class of no less than 0.075; cooling water flow rate is measured using flow measurement transmitters with an accuracy class of no less than 1; and auxiliary power is measured using power transmitters with an accuracy class of no less than 1.

[0088] This invention proposes a method for testing the performance of a gas turbine inlet cooling system, such as... Figure 2 As shown, it includes the following steps:

[0089] S1. After the temperature difference between the first and second measuring points of the heat exchanger fluctuates by less than 0.2℃ and remains stable for a certain period of time, data from the power generation system and the gas turbine intake system will begin to be recorded.

[0090] S2. Send the data from the power generation system and the gas turbine intake system to the data processing system to obtain the unit air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the power generation system, and system response time.

[0091] Test air temperature drop ΔT t The calculation formula is as follows:

[0092]

[0093] Among them, T in,i T represents the measured inlet air temperature of the i-th heat exchanger. out,i is the measured air temperature at the outlet of the i-th heat exchanger; m is the number of air temperature measuring points at the inlet of the heat exchanger; n is the number of air temperature measuring points at the outlet of the heat exchanger.

[0094] Refrigeration system cooling capacity Q t The calculation formula is as follows:

[0095] Q t =C p ×(T wout -T win )×F w

[0096] Among them, C p T is the specific heat capacity of water, taken as 4.2 kJ / kg; wout,i This refers to the measured temperature of the cooling water outlet from the heat exchanger; T win,i This refers to the measured value of the cooling water inlet temperature of the heat exchanger; F w This is the measured value of cooling water flow rate.

[0097] Unit test electrical power P t The calculation formula is as follows:

[0098] P t =P gt +P st

[0099] Among them, P gt P represents the measured electrical power of the gas turbine generator. st This is the measured value of the electric power of the steam turbine generator.

[0100] Unit test generator power consumption rate b t The calculation formula is as follows:

[0101]

[0102] Among them, F t This is a measurement of natural gas flow rate.

[0103] The formula for calculating the system response time Δt is as follows:

[0104] Δt=t2-t1

[0105] Where t1 is the time to open the cooling water inlet shut-off valve and the cooling water return shut-off valve, and t2 is the time when the temperature difference between the front and back of the heat exchanger fluctuates less than 0.2℃.

[0106] S3. Correct the unit parameters and obtain the corrected air temperature drop value, corrected electric power, corrected gas consumption rate, electric power increase value and gas consumption rate decrease value to realize the performance test of the gas turbine intake cooling system.

[0107] During the test, the gas turbine should be in Baseload mode, the fluctuation of the unit's electrical power should not exceed ±1.0%, and the change in atmospheric temperature should not exceed ±2℃. If these ranges are exceeded, the test should be repeated.

[0108] Air temperature drop correction value ΔT c The calculation formula is as follows:

[0109]

[0110] Where Q0 is the design value of the heat exchanger's heat exchange capacity; Q t This refers to the test value of the heat exchanger's heat transfer capacity.

[0111] The test used the gas turbine inlet cooling system being out of operation as the baseline condition. Test conditions when the gas turbine inlet cooling system was in operation were all corrected to the baseline condition for performance comparison. Corrections were needed for environmental parameters and auxiliary equipment power consumption. The corrected unit power output P... net,c The calculation formula is as follows:

[0112]

[0113] Where p0 is the measured atmospheric pressure under the baseline operating condition; T0 is the average measured atmospheric temperature under the baseline operating condition; RH0 is the measured atmospheric pressure under the baseline operating condition; p1 is the measured atmospheric pressure under the performance test condition; T1 is the average measured atmospheric temperature under the performance test condition; RH1 is the measured atmospheric humidity under the performance test condition; P ai C represents the measured power of the i-th auxiliary unit in the refrigeration system. P (p), C P (T) and C P (RH) are the formulas for the correction curves of atmospheric pressure, atmospheric temperature, and atmospheric humidity on the electrical power of the combined cycle unit, respectively.

[0114] Unit corrected gas consumption rate b net,c The calculation formula is as follows:

[0115]

[0116] Among them, C HR (p), C HR (T) and C HR (RH) represents the correction curves for the combined cycle unit's heat rate or heat consumption, respectively, based on atmospheric pressure, atmospheric temperature, and atmospheric humidity.

[0117] The formula for calculating the unit's power increase ΔP is as follows:

[0118] ΔP=P net,c -P t

[0119] The formula for calculating the reduction in unit gas consumption rate Δb is as follows:

[0120] Δb=b t -b net,c

[0121] The following analysis will be conducted using specific examples:

[0122] The present invention provides a method for testing the performance of a gas turbine inlet cooling system, comprising the following steps:

[0123] A. This invention was implemented in a combined cycle unit where the gas turbine intake cooling system had been modified. First, the rated heat exchange capacity of the heat exchanger, Q0 = 1500 kW, and the formula C for the correction curve of atmospheric pressure on the combined cycle unit's electrical power and heat rate were obtained. P (p) and C HR (p), the formula for the correction curve of atmospheric temperature on the electrical power and heat rate of the combined cycle unit C P (T), C HR (T), the formula for the correction curve of atmospheric humidity on the electrical power and heat rate of combined cycle units C P (RH), CHR (RH).

[0124] B. The system contains one combined cycle unit and one gas turbine intake cooling system. One 0.5-class ultrasonic flow meter is installed on the natural gas inlet gas turbine pipeline; one 0.1-class power meter is installed on both the gas turbine generator and the steam turbine generator; there are four auxiliary power-consuming units in the refrigeration system, each equipped with one 0.5-class power meter; two Class A platinum resistance thermometers are installed in the airflow channel before the heat exchanger, and six Class A platinum resistance thermometers are installed in the airflow channel after the heat exchanger; one industrial Class I thermocouple is installed on each of the heat exchanger inlet and outlet water pipelines; and one Class I electromagnetic flow meter is installed on the heat exchanger inlet water pipeline. These 17 measuring devices are connected to the data processing system via data cables.

[0125] C. Adjust the gas turbine to Baseload mode, close the cooling water inlet and return shut-off valves, and disconnect the gas turbine intake cooling system. Between 12:30 and 12:40, the temperature difference between the heat exchanger and its inlet fluctuated by 0.1℃, meeting the requirements, and data recording began. The test lasted 30 minutes (12:40-13:10). During the test, the unit's electrical power fluctuation ranged from an average of ±0.4%, and the atmospheric temperature change was 1.1℃, meeting the test requirements.

[0126] During the test, the gas turbine should be in Baseload mode, the fluctuation of the unit's electrical power should not exceed ±1.0%, and the change in atmospheric temperature should not exceed ±2℃. If these ranges are exceeded, the test should be repeated.

[0127] D. Keep the gas turbine running in Baseload mode, open the cooling water inlet and outlet valves, and start the gas turbine intake cooling system. At this time, t1 is 15:25, and the temperature after the heat exchanger begins to drop. From 15:40 to 15:50, the temperature difference between the front and back of the heat exchanger fluctuates by 0.15℃, which meets the requirements, and data recording begins. Simultaneously, t2 is recorded as 15:40. The test lasts for 30 minutes (15:50-16:20). During the test, the unit's electrical power fluctuation range is ±0.3% of the average value, and the atmospheric temperature change is 1.3℃, which meets the test requirements.

[0128] E. After the two test conditions are completed, the data are retrieved from the data acquisition system and averaged to calculate the combined cycle unit efficiency index after the gas turbine intake cooling system is put into operation. The calculation results are shown in Tables 1 to 3.

[0129] Table 1 Auxiliary machine operation mode

[0130]

[0131] Table 2 Auxiliary machine power consumption

[0132]

[0133] Table 3 Calculation Results

[0134]

[0135]

[0136] This invention proposes a method for testing the performance of a gas turbine inlet cooling system, such as... Figure 3 As shown, it includes a data acquisition module, a data processing module, and a parameter correction module;

[0137] The data acquisition module is used to record data of the power generation system and the gas turbine intake system after the fluctuation of the temperature difference measured at the first and second measurement points of the heat exchanger is less than 0.2℃ and is maintained for a certain period of time.

[0138] The data processing module is used to send data from the power generation system and the gas turbine intake system to the data processing system to obtain the unit air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the generator, and system response time.

[0139] The parameter correction module is used to correct the unit parameters, obtain the corrected air temperature drop value, the corrected electric power, the corrected gas consumption rate, the increase in electric power and the decrease in gas consumption rate, and realize the performance test of the gas turbine intake cooling system.

[0140] This invention proposes a performance testing system for a gas turbine inlet cooling system. The inlet cooling system is connected to the power generation system via an output airflow channel, and the data processing system is electrically connected to the arranged test measurement points. The system acquires the necessary parameters by first disconnecting the gas turbine inlet cooling system and conducting a baseline operating condition test, collecting baseline operating condition test data, and then, once the requirements are met, putting the gas turbine inlet cooling system back into operation for a performance test, recording the performance test data. Based on the test data, the performance index of the gas turbine inlet cooling system is calculated. This invention can accurately test the thermodynamic performance of the system, thereby evaluating whether the performance of the gas turbine inlet cooling system meets the relevant design specifications. Furthermore, the measurement system is simple and has good engineering implementation significance.

[0141] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing the performance of a gas turbine inlet cooling system, characterized in that, The performance testing of the gas turbine intake cooling system was achieved using a system that includes a power generation system, a gas turbine intake system, and a data processing system. The gas turbine intake system includes a heat exchanger (H2) and a refrigeration system (H3). A first measuring point for measuring pressure and temperature is installed on the air flow channel in front of the heat exchanger (H2); a second measuring point for measuring temperature is installed on the air flow channel behind the heat exchanger (H2); the power generation system is connected to the other end of the rear air flow channel; the cooling water inlet of the heat exchanger (H2) is connected to the outlet of the refrigeration system (H3), and a third measuring point for measuring the inlet water temperature and flow rate is installed on the connecting pipe; the cooling water outlet of the heat exchanger (H2) is connected to the return water outlet of the refrigeration system (H3), and a fourth measuring point for measuring the return water temperature is installed on the connecting pipe; a fifth measuring point for measuring electrical power is installed in the refrigeration system (H3). The first, second, third, fourth, and fifth measurement points are all connected to the data processing system (C1); The testing method includes the following steps: After the temperature difference measured at the first and second measuring points of the heat exchanger fluctuates by less than 0.2℃ and remains stable for a certain period of time, data from the power generation system and the gas turbine intake system are recorded. The data from the power generation system and the gas turbine intake system are sent to the data processing system to obtain the unit's air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the generator, and system response time. The unit parameters are corrected to obtain the corrected air temperature drop value, the corrected electric power, the corrected gas consumption rate, the increase in electric power and the decrease in gas consumption rate, so as to realize the performance test of the gas turbine intake cooling system. Air temperature drop correction value Δ T c The calculation method is as follows: Corrected power P net,c The calculation method is as follows: Corrected gas consumption rate b net,c The calculation method is as follows: Electric power increase value Δ P The calculation method is as follows: Gas consumption rate reduction Δ b The calculation method is as follows: Where, Δ T t To test the air temperature drop; Q 0 represents the design value for the heat exchanger's heat transfer capacity; Q t This refers to the test value of the heat exchanger's heat transfer capacity. p 0 represents the measured atmospheric pressure value under the baseline operating conditions; T 0 represents the average atmospheric temperature measured under baseline operating conditions; RH 0 represents the measured atmospheric pressure value under the baseline operating conditions; p 1 represents the atmospheric pressure measurement value under the performance test conditions; T 1 represents the average atmospheric temperature measured under the performance test conditions; RH 1 represents the measured atmospheric humidity value under the performance test conditions; P ai For the first refrigeration system i Auxiliary electromechanical power measurement value; C P ( p ( ) represents the correction curve for atmospheric pressure on the electrical power of a combined cycle unit; C P ( T ( ) represents the correction curve for the electrical power of a combined cycle unit based on atmospheric temperature; C P ( RH C is the formula for the correction curve of atmospheric humidity on the electrical power of a combined cycle unit; HR ( p (C) is the correction curve for the heat rate or heat consumption of a combined cycle unit based on atmospheric pressure; HR ( T (C) represents the correction curve for the heat rate or heat consumption of the combined cycle unit based on atmospheric temperature; HR ( RH () is a correction curve for atmospheric humidity on the heat rate or heat consumption of a combined cycle unit; P t For the test electrical power; b t To test the power consumption rate of the generator.

2. The method for testing the performance of a gas turbine inlet cooling system according to claim 1, characterized in that, The power generation system includes a gas turbine (B1), a gas turbine generator (E1), a steam turbine generator (E2), a waste heat boiler (H1), and a steam turbine (B2). A natural gas flow measuring point (F1) is installed on the natural gas inlet pipe of the gas turbine (B1). Natural gas enters the gas turbine (B1) for combustion and power generation. The gas turbine (B1) is connected to the gas turbine generator (E1), and a gas turbine power measuring point (W11) is installed on the gas turbine generator (E1). The flue gas generated by the gas turbine (B1) enters the waste heat boiler (H1) to generate steam. The steam enters the steam turbine (B2) for expansion and power generation. The steam turbine (B2) is connected to the steam turbine generator (E2), and a steam turbine power measuring point (W12) is installed on the steam turbine generator (E2).

3. The method for testing the performance of a gas turbine inlet cooling system according to claim 2, characterized in that, The electrical power of gas turbine generators (E1) and steam turbine generators (E2) is measured using power transmitters with an accuracy class of not less than 0.2; the flow rate of natural gas is measured using flow transmitters with an accuracy class of not less than 0.

5.

4. The method for testing the performance of a gas turbine inlet cooling system according to claim 1, characterized in that, The first measurement point includes an atmospheric pressure measurement point (P1), a first temperature measurement point (T1), and a second temperature measurement point (T2); The second measurement points include the third temperature measurement point (T3), the fourth temperature measurement point (T4), the fifth temperature measurement point (T5), the sixth temperature measurement point (T6), the seventh temperature measurement point (T7), the eighth temperature measurement point (T8), the ninth temperature measurement point (T9), and the tenth temperature measurement point (T8). The third measurement points include the cooling water inlet shut-off valve (V1), the cooling water inlet temperature measuring point (T9), and the cooling water flow measuring point (F2). The fourth measurement point includes the cooling water outlet shut-off valve (V2) and the cooling water return temperature measurement point (T10). The fifth measurement point includes several auxiliary machine power measurement points.

5. The method for testing the performance of a gas turbine inlet cooling system according to claim 4, characterized in that, The air temperatures before and after the heat exchanger (H2) were measured using a platinum resistance thermometer with an accuracy class of no less than A. The inlet and outlet temperatures of the cooling water are measured using thermocouples with an accuracy class of not less than Industrial Class I. Atmospheric pressure is measured using a pressure transmitter with an accuracy class of not less than 0.

075. Cooling water flow rate is measured using a flow measurement transmitter with an accuracy class of not less than 1. The power of auxiliary electromechanical equipment is measured using a power transmitter with an accuracy class of not less than 1.

6. The method for testing the performance of a gas turbine inlet cooling system according to claim 1, characterized in that, Test air temperature drop Δ T t The calculation method is as follows: in, T in,i For the first i Measurement values ​​of the inlet air temperature of each heat exchanger; T out,i For the first i Measured air temperature at the outlet of each heat exchanger; m This represents the number of air temperature measuring points at the heat exchanger inlet. n This represents the number of air temperature measurement points at the heat exchanger outlet. Refrigeration system cooling capacity Q t The calculation method is as follows: in, C p This is the specific heat capacity of water; T wout,i This is the measured value of the cooling water outlet temperature of the heat exchanger. T win,i This is the measured value of the cooling water inlet temperature for the heat exchanger. F w This is the measured value of cooling water flow rate; Test power P t The calculation method is as follows: in, P gt This refers to the measured electrical power of the gas turbine generator. P st This refers to the measured electrical power of the steam turbine generator. Test generator power consumption rate b t The calculation method is as follows: in, F t This is a measurement of natural gas flow rate.

7. The method for testing the performance of a gas turbine inlet cooling system according to claim 1, characterized in that, System response time Δ t The calculation method is as follows: in, t 1 represents the time required to open the cooling water inlet shut-off valve and the cooling water return shut-off valve. t 2 represents the time when the temperature difference between the front and back of the heat exchanger fluctuates by less than 0.2℃.

8. A performance testing system for a gas turbine inlet cooling system, characterized in that, The method for testing the performance of the gas turbine inlet cooling system as described in claim 1 includes: The data acquisition module is used to record data of the power generation system and the gas turbine intake system after the fluctuation of the temperature difference measured at the first and second measurement points of the heat exchanger is less than 0.2℃ and is maintained for a certain period of time. The data processing module is used to send data from the power generation system and the gas turbine intake system to the data processing system to obtain the unit air temperature drop, cooling capacity of the refrigeration system, test power, test power consumption rate of the generator, and system response time. The parameter correction module is used to correct the unit parameters, obtain the corrected air temperature drop value, the corrected electric power, the corrected gas consumption rate, the increase in electric power and the decrease in gas consumption rate, and realize the performance test of the gas turbine intake cooling system.

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