Electric starting system of gas turbine

Abstract

The utility model relates to the technical field of gas turbine equipment, and discloses an electric starting system of a gas turbine, which comprises a starting motor, a frequency conversion controller, a gas turbine control system and an accessory gear box, and the output end of the frequency conversion controller is respectively connected with the input end of the starting motor and the input end of the gas turbine control system. The input end of the frequency conversion controller is connected with the output end of the gas turbine control system, the output end of the starting motor is connected with the accessory gear box, and a heat dissipation device is arranged on the starting motor. According to the utility model, not only can the gas turbine be started quickly and repeatedly, but also the heat dissipation of the starting motor can be ensured, and the electric starting effect of the gas turbine is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbine equipment, in particular to a gas turbine electric starting system. Background Art

[0002] A gas turbine is a power mechanical device consisting of a gas generator, a power turbine, a control system and necessary auxiliary equipment. The function of the gas turbine starting system is to provide starting energy when the gas turbine is started, so that the gas turbine can quickly reach the operating speed. Normally, the gas turbine cannot start on its own and requires external power to rotate it to reach the operating speed. The gas turbine starting system uses other power sources to provide starting torque for the gas turbine to help it ignite and start.

[0003] At present, there are two main types of gas turbine starting systems: one is a hydraulic starting system with a hydraulic system as the actuator, in which the hydraulic pump is driven by an electric motor. The hydraulic pump converts mechanical energy into liquid pressure energy. The hydraulic starting system transmits pressure to the hydraulic motor through the flow and pressure of the liquid, and drives the rotor of the gas turbine to rotate, thereby starting the gas turbine; the other is an electric starting system with a radial flux motor as the actuator, which drives the rotor of the gas turbine to rotate through the radial flux motor, thereby starting the gas turbine.

[0004] For example, the Chinese utility model patent with patent number CN219795394U discloses a gas turbine electric starting system including a variable frequency starting motor and a starting motor frequency conversion cabinet for driving the gas turbine compressor rotor. The starting motor frequency conversion cabinet is connected to the gas turbine control system through a cable. The variable frequency starting motor is frequency-converted and driven by the starting motor frequency conversion cabinet. The starting motor frequency conversion cabinet drives the variable frequency starting motor to a set frequency according to a control command signal of the gas turbine control system, and at the same time feeds back its own state to the gas turbine control system. The variable frequency starting motor directly performs power transmission through a mechanical transmission mechanism.

[0005] There are at least the following problems in the prior art and the above-mentioned patents: First, the hydraulic starting system has problems such as complex system, large size, high cost, large energy loss and limited use in cold areas; second, the electric starting system using radial flux motor has problems such as large size, large starting interval and small number of continuous starts; third, the starting motor mostly adopts natural cooling or air cooling for heat dissipation, and the heat dissipation effect is poor. Utility Model Content

[0006] The utility model aims at the deficiencies of the prior art and develops a gas turbine electric starting system. The utility model can ensure the rapid and multiple starting of the gas turbine and the heat dissipation of the starting motor, thereby effectively improving the effect of the gas turbine electric starting.

[0007] The technical solution for solving the technical problem of the utility model is: a gas turbine electric starting system, including a starting motor and a frequency conversion controller, and also including a gas turbine control system and an accessory gear box. The output end of the frequency conversion controller is respectively connected to the input end of the starting motor and the input end of the gas turbine control system, the input end of the frequency conversion controller is connected to the output end of the gas turbine control system, the output end of the starting motor is connected to the accessory gear box, and a heat dissipation device is provided on the starting motor.

[0008] As an optimization, the variable frequency controller is a heavy-duty variable frequency controller, and the starting motor is a permanent magnet axial flux motor. The axial length of the axial flux motor is only about half of that of the radial flux motor, and the volume and weight are smaller than those of the radial flux motor, and the power density is higher, which can ensure fast and multiple starts of the gas turbine, improve space utilization and reduce costs.

[0009] As an optimization, the heat dissipation device includes a first heat exchange end and a second heat exchange end, the first heat exchange end is arranged on the starter motor, a heat dissipation fan is arranged on the second heat exchange end, the water outlet of the first heat exchange end is connected to the water inlet of the second heat exchange end through a hot water pipe, and the water outlet of the second heat exchange end is connected to the water inlet of the first heat exchange end through a cold water pipe. By arranging the first heat exchange end, the second heat exchange end, the hot water pipe and the cold water pipe, a complete circulating heat dissipation system is formed, the heat generated by the operation of the starter motor is transferred to the second heat exchange end, so that the temperature inside the starter motor is stabilized within a safe range to avoid overheating; by arranging the heat dissipation fan, the heat exchange speed between the second heat exchange end and the air can be accelerated, so that the cooling water in the second heat exchange end can be quickly cooled down.

[0010] As an optimization, a temperature sensor is provided on the cold water pipe. By providing the temperature sensor, the temperature of the cooling water in the cold water pipe can be detected, and the speed of the cooling fan can be adjusted according to the temperature of the cooling water to ensure the heat dissipation effect.

[0011] As an optimization, a filter is also provided on the cold water pipe, and the mesh number of the filter is 80 to 400. By providing the filter, impurities in the cooling water can be filtered, the heat exchange efficiency can be improved, and the impurities can be prevented from damaging the first heat exchange end and the second heat exchange end.

[0012] As an optimization, a circulating water pump is also provided on the cold water pipe. By providing a circulating water pump, the circulation speed of the cooling water can be accelerated and the heat dissipation effect can be improved.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] By setting a starter motor, it can be used as an actuator to drive the rotor of the gas turbine to rotate, thereby realizing the starting of the gas turbine; by setting a frequency conversion controller, the operation of the starter motor can be monitored and controlled; by setting a gas turbine control system, a command can be issued to control the starter motor; by setting an accessory gear box, a gas turbine is arranged above the accessory gear box, and the rotor of the gas turbine can be directly driven to rotate through a mechanical transmission mechanism; by setting a heat dissipation device, the temperature inside the starter motor can be stabilized within a safe range to avoid overheating and damage to the internal components of the starter motor. The utility model can ensure rapid and multiple starts of the gas turbine, and can also ensure the heat dissipation of the starter motor, effectively improving the effect of the electric start of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a system diagram of the first embodiment of the utility model.

[0016] Figure 2 The figure is a speed and torque curve diagram of the starting process of the starter motor in one embodiment of the utility model.

[0017] In the figure, 1, starting motor; 2, frequency conversion controller; 3, heat dissipation device; 4, cooling fan; 5, temperature sensor; 6, filter; 7, circulating water pump; 8, gas turbine; 9, gas turbine control system;

[0018] 31. First heat exchange end; 32. Second heat exchange end; 33. Hot water pipe; 34. Cold water pipe. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0020] Example 1

[0021] Figure 1 to Figure 2 An embodiment of the present utility model is as follows: Figure 1 to Figure 2 As shown, a gas turbine electric starting system includes a starting motor 1 and a frequency conversion controller 2, and also includes a gas turbine control system 9 and an accessory gearbox. The gas turbine control system 9 is connected to the frequency conversion controller 2 through a cable. The frequency conversion controller 2 controls the starting motor 1 according to the instructions issued by the gas turbine control system 9. The output end of the frequency conversion controller 2 is respectively connected to the input end of the starting motor 1 and the input end of the gas turbine control system 9, and the input end of the frequency conversion controller 2 is connected to the output end of the gas turbine control system 9. The frequency conversion controller 2 receives the control instructions issued by the gas turbine control system 9. At the same time, the frequency conversion controller 2 can feed back its own state to the gas turbine control system 9. The output end of the starting motor 1 is connected to the accessory gearbox, and the starting motor 1 is provided with a heat dissipation device 3.

[0022] By setting up the starter motor 1, it can be used as an actuator to drive the rotor of the gas turbine 8 to rotate, thereby realizing the starting of the gas turbine 8; by setting up the frequency conversion controller 2, the operation of the starter motor 1 can be monitored and controlled; by setting up the gas turbine control system 9, instructions can be issued to control the starter motor 1; by setting up an accessory gear box, a gas turbine 8 is arranged above the accessory gear box, and the rotor of the gas turbine 8 can be directly driven to rotate through a mechanical transmission mechanism; by setting up the heat dissipation device 3, the temperature inside the starter motor 1 can be stabilized within a safe range to avoid overheating and damage to the internal components of the starter motor 1.

[0023] The frequency converter 2 is a heavy-duty frequency converter, the starter motor 1 is a permanent magnet axial flux motor, the installation method used is B5, the weight is 75kg, the peak power of the starter motor 1 is 150kW, the minimum interval between two adjacent starts is 1 minute, and the starter motor 1 has the ability to start 5 times in a row, with an interval of 1 minute - cooling for 5 minutes - starting 5 times in a row, with an interval of 1 minute. The axial length of the axial flux motor is only about half of that of the radial flux motor, and the volume and weight are smaller than those of the radial flux motor, and the power density is higher, which can ensure the rapid and multiple starts of the gas turbine 8, improve space utilization and reduce costs.

[0024] The heat dissipation device 3 includes a first heat exchange end 31 and a second heat exchange end 32. The first heat exchange end 31 is arranged on the starter motor 1. A heat dissipation fan 4 is arranged on the second heat exchange end 32. The water outlet of the first heat exchange end 31 is connected to the water inlet of the second heat exchange end 32 through a hot water pipe 33. The water outlet of the second heat exchange end 32 is connected to the water inlet of the first heat exchange end 31 through a cold water pipe 34. By arranging the first heat exchange end 31, the second heat exchange end 32, the hot water pipe 33 and the cold water pipe 34, a complete circulation heat dissipation system is formed, and the heat generated by the operation of the starter motor 1 is transferred to the second heat exchange end 32, so that the temperature inside the starter motor 1 is stabilized within a safe range to avoid overheating; by arranging the heat dissipation fan 4, the heat exchange speed between the second heat exchange end 32 and the air can be accelerated, so that the cooling water in the second heat exchange end 32 can be quickly cooled down.

[0025] The cold water pipe 34 is provided with a temperature sensor 5. By providing the temperature sensor 5, the temperature of the cooling water in the cold water pipe 34 can be detected, and the rotation speed of the cooling fan 4 can be adjusted according to the temperature of the cooling water to ensure the heat dissipation effect.

[0026] The cold water pipe 34 is also provided with a filter 6, and the mesh number of the filter 6 is 200. By providing the filter 6, impurities in the cooling water can be filtered, the heat exchange efficiency is improved, and the impurities are prevented from damaging the first heat exchange end 31 and the second heat exchange end 32.

[0027] The cold water pipe 34 is also provided with a circulating water pump 7, the flow rate of the circulating water pump 7 is 15L / min, and the head is 20m. By providing the circulating water pump 7, the circulation speed of the cooling water can be accelerated and the heat dissipation effect can be improved.

[0028] When in use, the gas turbine control system 9 issues a control instruction, and the frequency conversion controller 2 controls the starter motor 1 according to the instruction issued by the gas turbine control system 9. The starter motor 1 drives the rotor of the gas turbine 8 to rotate through the accessory gear box. The speed of the starter motor 1 is the same as the speed of the gas turbine 8. Figure 2 As shown, the starter motor 1 drives the gas turbine 8 to a speed of 2250 r / min, the maximum motor torque is 447 N·m, and drives the gas turbine 8 to run for 5 minutes at this speed for cleaning. After the cleaning is completed, the speed of the starter motor 1 first drops to below 1600 r / min and then rises to 1700 r / min. At this time, ignition is performed. After the ignition is successful, the speed of the starter motor 1 rises rapidly, and the output of the electric starting system gradually decreases. When the starter motor 1 reaches 4300 r / min-4800 r / min, the starter motor 1 is tripped. After the trip, the combustion engine control The control system 9 sends a command to control the starter motor 1 to stop running; at the same time of electric starting, the circulating water pump 7 provides power for the cooling water to circulate in the heat dissipation device 3, and the cooling water absorbs the heat generated by the operation of the starter motor 1 at the first heat exchange end 31, and then is transported to the second heat exchange end 32 through the hot water pipe 33. The heat dissipation fan 4 accelerates the heat exchange speed between the second heat exchange end 32 and the air, so that the cooling water in the second heat exchange end 32 is quickly cooled down. The cooled cooling water passes through the temperature sensor 5 and the filter 6 in the cold water pipe 34 in turn, and is then pumped back to the first heat exchange end 31 by the circulating water pump 7 to continue heat exchange. The utility model can not only ensure the rapid and multiple starting of the gas turbine 8, but also ensure the heat dissipation of the starter motor, and effectively improve the effect of the electric starting of the gas turbine.

[0029] The descriptions of the orientation or relative position relationship of the structure in the present invention, such as the orientation or relative position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A gas turbine electric starting system, comprising a starting motor (1) and a frequency conversion controller (2), characterized in that: The invention also comprises a combustion engine control system (9) and an accessory gearbox, wherein the output end of the frequency conversion controller (2) is respectively connected to the input end of the starter motor (1) and the input end of the combustion engine control system (9), the input end of the frequency conversion controller (2) is connected to the output end of the combustion engine control system (9), the output end of the starter motor (1) is connected to the accessory gearbox, the starter motor (1) is provided with a heat dissipation device (3), the heat dissipation device (3) comprises a first heat exchange end (31) and a second heat exchange end (32), the first heat exchange end (31) is arranged on the starter motor (1), the second heat exchange end (32) is provided with a heat dissipation fan (4), the water outlet of the first heat exchange end (31) is connected to the water inlet of the second heat exchange end (32) through a hot water pipe (33), and the water outlet of the second heat exchange end (32) is connected to the water inlet of the first heat exchange end (31) through a cold water pipe (34).

2. The gas turbine electric starting system according to claim 1, characterized in that: The frequency converter (2) is a heavy-duty frequency converter, and the starter motor (1) is a permanent magnet axial flux motor.

3. The gas turbine electric starting system according to claim 2, characterized in that: A temperature sensor (5) is provided on the cold water pipe (34).

4. The gas turbine electric starting system according to claim 3, characterized in that: A filter (6) is also provided on the cold water pipe (34), and the filter mesh number of the filter (6) is 80 to 400 meshes.

5. The gas turbine electric starting system according to claim 4, characterized in that: A circulating water pump (7) is also provided on the cold water pipe (34).

Images