Large compressor test power system and working method

Abstract

The invention provides a large-scale compressor test power system and a working method, and aims to overcome the defects in the prior art, effectively reduce the energy consumption in the test process of a large-scale compressor or a gas compressor, and improve the capacity range of a compressor test bed. The invention relates to the field of large-scale compressor performance test research, which comprises an open or closed system formed by a variable-frequency and variable-speed motor, a turbo expander, a step-up gear box and a compressor, and is characterized in that high-temperature and high-pressure airflow at an outlet of the compressor enters the turbo expander through an expander inlet regulating valve to do work; and the air returns to the compressor to form a closed test system or is directly emptied through a silencer to form an open test system. The turbo expander and the frequency conversion debugging motor jointly drive the compressor to operate, high-temperature and high-pressure gas generated by the compressor drives the turbo expander to do work, the output power of the motor can be correspondingly reduced, energy consumption during compressor testing can be reduced, and the operation cost of the test bed is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of large-scale compressor performance test research, and particularly relates to a large-scale compressor test power system. BACKGROUND

[0002] Compressors or compressors are widely used in the fields of energy, power, oil and gas chemical industry, aviation, ship, etc. The stability, safety and economy of the operation are problems to be solved in industrial production and scientific research. Continuously improving the efficiency of the compressor or compressor and reducing the energy consumption of the compressor or compressor can effectively improve the energy utilization efficiency and achieve the purpose of energy saving and emission reduction. In order to improve the technical level of the compressor, a series of test research needs to be carried out in the process of research and development and manufacturing. Through the test of the compressor, the performance parameters such as efficiency, flow rate and pressure ratio of the compressor can be obtained, the understanding of the internal flow mechanism of the compressor is improved, and the perfect compressor design database is established, which is of great significance to guide the optimization design of the compressor. In addition, the rationality of the design can also be verified through the test of the compressor, so as to ensure that the compressor is designed reasonably, reliably, safely and stably. Therefore, the test of the compressor plays an indispensable role in the development of the compressor technology.

[0003] As a power consumption unit, the energy power consumption of the compressor test is the most important cost part of the later operation of the compressor test bench. The large-scale compressor test has large power consumption, and the energy consumption cost is huge. Taking a gas turbine compressor as an example, the power consumption of a 300MW heavy gas turbine compressor exceeds 400MW. If the research and development test of the compressor is carried out, the power consumption of the 1 / 3 scale compressor test also exceeds 40MW. In order to obtain accurate performance data of the compressor, a plurality of tests need to be carried out under different working conditions. According to the calculation of 100 hours, the power consumption of a single compressor test exceeds 4 million degrees. The energy consumption of the test process is huge. When facing special working medium and special parameter requirements, a closed cycle system is also needed. The compressor does work on the gas, which finally needs to be cooled by a heat exchanger. The test bench has high parameter requirements for the driving system, heat exchanger, valve and other equipment, and the equipment cost investment of the test bench is large.

[0004] The previous compressor test power system is generally electrically driven or steam driven. The former directly drives the compressor or compressor from the city network, and the frequency conversion motor has high speed regulation precision. The latter drives the compressor or compressor to run by using a driving turbine, and needs to be configured with a boiler, a heat exchanger, a condenser and the like. The system is complex, and the speed regulation precision is relatively low. The two driving modes cannot avoid the problem of high energy consumption, and the equipment investment cost is large. Therefore, a more energy-saving power system configuration is needed, which can maximize the reduction of energy consumption under the premise of ensuring the test operation precision, and reduce the operation cost and construction cost of the compressor test bench. SUMMARY

[0005] In view of the deficiencies of the prior art, the large compressor test power system and working method can effectively reduce the energy consumption in the test process of the large compressor or the compressor and improve the capacity range of the compressor test bed.

[0006] To achieve the purpose of the application, the technical scheme adopted is: As Figure 1 shown, the compressor test bed power system comprises a variable frequency speed regulation motor 1, a turbine expander 2 and a speed increasing gear box 3, and the turbine expander 2 and the speed increasing gear box 3 are respectively located on the two sides of the variable frequency speed regulation motor 1.

[0007] Further, the compressor test bed power system further comprises a diaphragm coupling I, a diaphragm coupling II and a diaphragm coupling III, wherein the variable frequency speed regulation motor 1 is connected with the turbine expander 2 through the diaphragm coupling I, the variable frequency speed regulation motor 1 is connected with the speed increasing gear box 3 through the diaphragm coupling II, and the speed increasing gear box 3 is connected with the compressor 4 through the diaphragm coupling III.

[0008] Further, the compressor test bed power system further comprises a compressor inlet regulating valve 5, a compressor outlet back pressure regulating valve 7 and an expander inlet regulating valve 8.

[0009] Further, the compressor test bed power system further comprises a heat exchanger 6.

[0010] Further, the compressor test bed power system further comprises a silencing tower 9.

[0011] The working method of the large compressor test power system provided by the application is that the high-temperature and high-pressure gas flow at the outlet of the compressor 4 is divided into two paths, one path directly enters the turbine expander 2 to do work, and the other path passes through an exhaust pipeline, and the gas flow at the outlet of the turbine expander 2 and the gas flow in the exhaust pipeline are combined and then returned to the compressor 4 or directly discharged.

[0012] The working method of the large compressor test power system is further provided as follows: (1) As Figure 2 shown, the high-temperature and high-pressure gas flow at the outlet of the compressor 4 is divided into two paths, one path directly enters the turbine expander 2 to do work through the expander inlet regulating valve 8, and the other path passes through the compressor outlet back pressure regulating valve 7, the turbine expander 2 and the compressor outlet back pressure regulating valve 7 are arranged in parallel, the low-temperature gas flow at the outlet of the turbine expander 2 and the exhaust pipeline after the compressor outlet back pressure regulating valve 7 are combined and then returned to the inlet of the compressor 4 through the heat exchanger 6 to form a closed test system.

[0013] (2) As Figure 3As shown, the high-temperature and high-pressure gas stream at the outlet of the compressor 4 is divided into two paths, one of which directly enters the turbine expander 2 to do work through the inlet regulating valve 8 of the turbine expander, and the other of which passes through the compressor outlet back pressure regulating valve 7, the turbine expander 2 and the compressor outlet back pressure regulating valve 7 being arranged in parallel, and the gas stream at the outlet of the turbine expander 2 and the exhaust pipeline after the compressor outlet back pressure regulating valve 7 being combined and then directly exhausted through the silencer 6 to form an open test system.

[0014] (3) In the normal shutdown, accident shutdown or shutdown under the condition of low speed, the compressor outlet back pressure regulating valve 7 is fully opened, and the turbine expander 2 is used as a load to shorten the shutdown time of the compressor.

[0015] Wherein, the direction of the turbine expander is consistent with the direction of the motor when doing work.

[0016] Wherein, the turbine expander 2 has less stages, short shaft and large work capacity.

[0017] Wherein, the turbine expander 2 and the variable frequency motor 1 operate at the same speed.

[0018] Wherein, the rotor of the turbine expander 2 has no first-order critical speed in the full speed range, is a rigid rotor, and the shaft system of the driving system is stable.

[0019] The compressor outlet back pressure regulating valve 7 and the turbine expander inlet regulating valve 8 are used to cooperatively regulate the outlet pressure of the compressor 4.

[0020] The above technical scheme has the following beneficial effects: 1. The turbine expander and the variable frequency motor jointly drive the compressor to operate, the high-temperature and high-pressure gas generated by the compressor drives the turbine expander to do work, the output power of the motor can be correspondingly reduced, the energy consumption during the test of the compressor can be reduced, and the operation cost of the test bench is reduced.

[0021] 2. The high-temperature and high-pressure gas at the outlet of the compressor is expanded to do work through the turbine expander, and the temperature of the gas is reduced, so that Figure 2 In the closed cycle test system as shown, the heat exchange capacity of the heat exchanger is reduced to maintain the stability of the inlet parameters, and the capacity of the heat exchanger is greatly reduced; and Figure 3 In the open test system as shown, the gas is directly exhausted, and the maximum tolerance temperature of the silencer is reduced. Both the closed cycle test system and the open test system can reduce the construction investment cost of the test bench.

[0022] 3. The turbine expander and the motor are connected in series to jointly drive the compressor to operate, the shaft power of the compressor can exceed the maximum power of the motor, the parameters of the motor and the frequency converter can be reduced when the motor is selected for the construction of the driving system of the test bench, the construction investment cost of the driving system of the test bench is saved, and the test power range of the compressor can be expanded by increasing the turbine expander when the maximum power of the motor is constant.

[0023] 4. During the test shutdown process, when the compressor outlet back pressure regulating valve is opened and the pressure at the compressor outlet and the turbine expander inlet is reduced to a level insufficient to drive the expander to work, the expander becomes a power-consuming device due to the wind effect, which can shorten the system shutdown time.

[0024] 5. The speed regulation of the test system is realized by a variable frequency motor, and the speed regulation accuracy remains at a high level. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Figure 1 is a schematic diagram of a differential pressure turbine expander process pipeline system; Figure 2 Figure 2 is a closed compressor test system diagram; Figure 3 Figure 3 is an open compressor test system diagram; Figure 4 Figure 4 is a closed compressor test system parameter diagram provided for Example 1; Figure 5 Figure 5 is a closed compressor test system parameter diagram provided for Example 2; In the figure: 1 - variable frequency motor, 2 - turbine expander, 3 - speed increasing gear box, 4 - compressor, 5 - compressor inlet regulating valve, 6 - heat exchanger, 7 - compressor outlet back pressure regulating valve, 8 - expander inlet regulating valve, 9 - silencer tower, 10 - diaphragm coupling I, 11 - diaphragm coupling II, 12 - diaphragm coupling III. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1 A closed compressor test system of a large-scale compressor test power system: The compressor 4 and the turbine expander 2 are located on both sides of the driving system, the motor 1, the turbine expander 2 and the gear box 3 jointly serve as the power system of the compressor 4, the compressor outlet is connected with the turbine expander inlet through the expander inlet regulating valve 8, the high-temperature and high-pressure gas flow at the compressor outlet can enter the turbine expander to expand and work, at the same time, the turbine expander and the compressor outlet back pressure regulating valve 7 are connected in parallel, the turbine expander outlet and the compressor outlet back pressure regulating valve outlet are merged, and the closed test system is formed by returning to the compressor inlet through the heat exchanger 6.

[0028] The compressor outlet parameters are adjusted through the compressor outlet back pressure regulating valve and the expander inlet regulating valve, and the turbine expander speed is consistent with the motor speed during operation.

[0029] In the closed test system, the energy generated by the compressor 4 working on the gas is ultimately absorbed by the cooling water of the heat exchanger. The large compressor closed test provided in this embodiment has a compressor shaft power of 40376 kW. In order to keep the test system parameters stable, the heat exchange capacity of the heat exchanger is also 40376 kW. Considering a 10% transmission loss, the motor output power is about 44862 kW. In this embodiment, as shown in Figure 4 60% of the high-temperature and high-pressure gas at the compressor outlet passes through the expander to do work. The turbine expander efficiency is calculated at 90%. The heat exchange capacity of the heat exchanger is only 23280 kW, the heat exchanger capacity is reduced by 42.3%, and the motor output power is 25862 kW. The system can save 19000 degrees of electricity per hour. As can be known from this embodiment, under reasonable design, more high-temperature and high-pressure gas can pass through the expander to do work, thereby greatly reducing the heat exchanger power and the motor output power, effectively reducing the heat exchanger equipment investment cost, and reducing the test energy consumption.

[0030] Embodiment 2 An open compressor test system of a large compressor test power system: The compressor 4 and the turbine expander 2 are located on both sides of the driving system. The motor 1, the turbine expander 2 and the gear box 3 jointly serve as the power system of the compressor 4. The compressor outlet is connected to the turbine expander inlet through the expander inlet regulating valve 8. The high-temperature and high-pressure gas flow at the compressor outlet can enter the turbine expander to expand and do work. Meanwhile, the turbine expander and the compressor outlet back pressure regulating valve 7 are connected in parallel. The turbine expander outlet and the compressor outlet back pressure regulating valve outlet are combined, and the open test system is formed by directly exhausting through the silencer 6.

[0031] In the open test system, the high-temperature and high-pressure gas at the compressor outlet is exhausted through the silencer. In this embodiment, the G / J type combustion turbine compressor is taken as an example for scaled test. The temperature at the compressor outlet is 535.22°C. The high-temperature gas has a higher requirement for the material selection of the silencer. The compressor shaft power is 40711 kW. Considering a 10% transmission loss, the motor output power is about 45234 kW. In this embodiment, as shown in Figure 5 60% of the high-temperature and high-pressure gas at the compressor outlet passes through the expander to do work. The turbine expander efficiency is calculated at 90%. The temperature of the mixed gas flow is 312.44°C. The temperature drop of the gas entering the silencer is more than 200°C. The motor output power is 23888 kW. The system can save 21346 degrees of electricity per hour. As can be known from this embodiment, under reasonable design, more high-temperature and high-pressure gas can pass through the expander to do work, thereby greatly reducing the temperature entering the silencer and the motor output power, effectively reducing the silencer equipment investment cost, and reducing the test energy consumption.

[0032] Embodiment 3 An open compressor test system of a large compressor test power system during start and stop: The embodiment is that when the compressor rotation speed is low, the outlet parameter of the compressor is low, the gas amount through the turbine expander is not enough to expand and work, the expander is used as a load, mainly bearing power consumption and friction air blowing loss, the power consumption is small when the rotation speed is low, and the system operation is not affected. Then when the compressor rotation speed reaches a certain degree, the compressor outlet pressure and temperature are increased, the gas through the expander overcomes the bearing power consumption and the air blowing friction loss, and then starts to work externally, the higher the outlet parameter of the compressor, the stronger the working capacity of the expander.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A test power system for a large compressor, characterized in that, include: The variable frequency speed control motor (1), the turbine expander (2), the speed increaser gearbox (3), and the compressor (4) are located on both sides of the variable frequency speed control motor (1).

2. The large compressor test power system according to claim 1, characterized in that: The variable frequency speed control motor (1) is connected to the turbine expander (2) through diaphragm coupling I (10); the variable frequency speed control motor (1) is connected to the speed increase gearbox (3) through diaphragm coupling II (11); the speed increase gearbox (3) is connected to the compressor (4) through diaphragm coupling III (12).

3. The large compressor test power system according to claim 1, characterized in that: The power system also includes a compressor inlet regulating valve (5), a compressor outlet back pressure regulating valve (7), and an expander inlet regulating valve (8).

4. The large compressor test power system according to claim 1, characterized in that: The power system also includes a heat exchanger (6).

5. The large compressor test power system according to claim 1, characterized in that: The power system also includes a silencing tower (9).

6. A method for operating a large compressor test power system as described in any one of claims 1-5, characterized in that: The high-temperature, high-pressure airflow at the outlet of the compressor (4) is divided into two paths. One path directly enters the turbine expander (2) to do work, and the other path passes through the exhaust pipe. The airflow at the outlet of the turbine expander (2) and the airflow in the exhaust pipe merge and return to the compressor (4) or are discharged directly.

7. The working method of the large compressor test power system according to claim 6, characterized in that: The method of returning to the compressor is to split the high-temperature and high-pressure airflow at the outlet of the compressor (4) into two paths. One path goes directly into the turbine expander (2) to do work through the expander inlet regulating valve (8), and the other path goes through the compressor outlet back pressure regulating valve (7). The turbine expander (2) and the compressor outlet back pressure regulating valve (7) are arranged in parallel. The airflow at the outlet of the turbine expander (2) and the exhaust pipe after the compressor outlet back pressure regulating valve (7) merge and return to the compressor (4) through the heat exchanger (6) to form a closed test system.

8. The working method of the large compressor test power system according to claim 6, characterized in that: The direct discharge method is to split the high-temperature and high-pressure airflow at the outlet of the compressor (4) into two paths. One path goes directly into the turbine expander (2) through the expander inlet regulating valve (8) to do work, and the other path goes through the compressor outlet back pressure regulating valve (7). The turbine expander (2) and the compressor outlet back pressure regulating valve (7) are arranged in parallel. The airflow at the outlet of the turbine expander (2) and the exhaust pipe after the compressor outlet back pressure regulating valve (7) merge and are directly discharged through the silencer tower (9) to form an open test system.

9. The working method of the large compressor test power system according to claim 6, characterized in that: The direction of rotation of the turbine expander (2) when it is working is the same as that of the variable frequency speed control motor (1).

10. A method for operating a large compressor test power system as described in claim 1, characterized in that: When the large compressor is shut down, the compressor outlet back pressure regulating valve (7) is fully open, and the turbine expander (2) acts as a load to shorten the compressor shutdown time.

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