Gearbox type supercritical carbon dioxide turbine device

Abstract

The utility model discloses a gear box type supercritical carbon dioxide turbine device which aims at improving the rotating speed of a turbine, reducing the size of the turbine and integrating multiple functions. A gear box type supercritical carbon dioxide turbine device comprises a gear box and a generator, the gear box is provided with a low-speed shaft and a high-speed shaft, the low-speed shaft of the gear box is in power connection with the generator, a high-pressure stage and a low-pressure stage of a turbine are arranged at the two ends of the high-speed shaft of the gear box, and flow channels of the high-pressure stage and the low-pressure stage of the turbine are communicated through a connecting steam pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of supercritical carbon dioxide turbines, in particular to a gear box type supercritical carbon dioxide turbine device. Background Art

[0002] The supercritical carbon dioxide turbine unit is one of the main equipment in the supercritical carbon dioxide Brayton cycle power generation system. It is a direct output of electrical energy and its efficiency directly affects the efficiency of the power generation system. Due to the high efficiency and compact size of the supercritical carbon dioxide cycle, its application in nuclear energy, solar thermal energy, and ship power systems has great prospects.

[0003] The supercritical carbon dioxide turbine is a rotary power device. High-temperature and high-pressure supercritical carbon dioxide passes through a fixed nozzle to become an accelerated airflow and is then sprayed onto the moving blades, thereby driving the rotor to rotate and performing work externally.

[0004] The existing supercritical carbon dioxide turbine is limited by the generator speed, the turbine size is large, the production cost is high, and the turbine device has large fluctuations when starting. Affected by the high-temperature and high-pressure supercritical carbon dioxide, the rotor angular acceleration is large and cannot start smoothly. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a gearbox-type supercritical carbon dioxide turbine device, which aims to increase the turbine speed, reduce the turbine volume, and integrate multiple functions.

[0006] The purpose of the utility model is achieved in this way:

[0007] A gearbox-type supercritical carbon dioxide turbine device comprises a gearbox and a generator. The gearbox has a low-speed shaft and a high-speed shaft. The low-speed shaft of the gearbox is connected to the generator power. The high-pressure stage and the low-pressure stage of the turbine are arranged at both ends of the high-speed shaft of the gearbox. The flow passages of the high-pressure stage and the low-pressure stage of the turbine are connected through a connecting steam pipe.

[0008] Preferably, it also includes an oil station, which is arranged at the lower end of the gear box, connected to the gear box and the generator, and is used to provide lubricating oil to the gear box and the generator.

[0009] Preferably, the high pressure stage of the turbine is on the same side as the generator.

[0010] Preferably, the air inlet of the high-pressure stage cylinder of the turbine is provided with a lift valve and a main steam valve.

[0011] Preferably, it also includes a turning motor and a crisis tripping device, two transmission gears are arranged on the low-speed shaft, input gears are arranged on the input shafts of the turning motor and the crisis tripping device respectively, and each input gear is meshed with the corresponding transmission gear respectively.

[0012] Preferably, the low-speed shaft and the high-speed shaft are arranged on the center plane of the gearbox and are driven by gears. End face teeth are respectively provided at both ends of the high-speed shaft, and the end face teeth are connected to the high-pressure stage turbine / low-pressure stage turbine of the turbine.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0014] The supercritical carbon dioxide turbine device has a higher turbine speed, a smaller turbine unit, a compact structure, and a low production cost. At the same time, the high and low pressure stages of the turbine are hung on both sides of the gear, which makes assembly, inspection and maintenance more convenient. An emergency shut-off device is added to make the device safer. A cranking motor is added to make the turbine device start more smoothly and improve the reliability of the turbine device. The emergency shut-off device and the cranking motor are arranged in the gear lower housing to save more space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 is a cross-sectional schematic diagram of a gear box;

[0017] Figure 3 It is a top view schematic diagram of the utility model;

[0018] Figure 4 It is a front view schematic diagram of the utility model;

[0019] Figure 5 A top view of the gearbox.

[0020] Reference numerals

[0021] In the attached figure, 1-oil station, 2-turning motor, 3-gear box, 4-low pressure stage, 5-connecting steam pipe, 6-main steam valve, 7-lift valve, 8-high pressure stage, 9-generator, 10-coupling, 11-emergency isolation device

[0022] 31-gearbox housing, 32-front end cover of high-speed shaft, 33-front bearing of high-speed shaft, 34-low-speed shaft, 35-front end cover of low-speed shaft, 36-front bearing of low-speed shaft, 37-gear shaft of emergency shut-off device, 38-gear shaft of turning device, 39-rear bearing of low-speed shaft, 310-rear end cover of low-speed shaft, 311-rear bearing of high-speed shaft, 312-rear end cover of high-speed shaft, 313-high-speed shaft. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 5The gearbox type high-speed steam turbine is composed of an oil station, a cranking motor, a gearbox, a low-pressure stage, a connecting steam pipe, a main steam valve, a lifting valve, a high-pressure stage, a generator, a coupling and other equipment. The oil station 1 provides lubricating oil for the gearbox 3 and the generator 9. The gearbox 3 is installed on the oil station 1. The low-speed shaft of the gearbox 1 is connected to the generator 9 through a coupling 10. The high-pressure stage 8 and the low-pressure stage 4 are hung on both sides of the high-speed shaft of the gearbox 9. The high-pressure stage 8 is on the same side as the generator 9. The flow channels of the high-pressure stage 8 and the low-pressure stage 4 are connected by a connecting steam pipe 5. The air inlet of the high-pressure stage 8 cylinder is provided with a lifting valve 7 and a main steam valve 6. The gearbox 3 is also designed with a cranking motor 2 and a crisis shut-off device 11.

[0024] The low-speed shaft 34 and the high-speed shaft 313 are arranged on the dividing plane of the gearbox 31. The high-speed shaft bearings 33, 311 and the low-speed shaft bearings 36, 39 are designed with axial splitting. End face teeth are designed at both ends of the high-speed shaft 313 to connect with the high-pressure stage turbine and the low-pressure stage turbine. Three pairs of gears are provided on the low-speed shaft 34. The middle gear is meshed with the high-speed shaft gear, the right gear (transmission gear) is meshed with the input gear of the turning device, and the left gear (transmission gear) is meshed with the input gear of the emergency shut-off device. The turning device gear shaft 38 and the emergency shut-off device gear shaft 37 are installed on the lower case of the gearbox 31.

[0025] High-temperature and high-pressure supercritical carbon dioxide radially enters the high-pressure stage cylinder through the main steam valve and the lifting plate valve to drive the turbine to do work, and then radially enters the low-pressure stage cylinder through the connecting steam pipe to drive the turbine to do work. The high-pressure stage turbine and the low-pressure stage turbine are connected to the high-speed shaft, and the high-speed shaft pinion and the low-speed shaft large gear are meshed, and the generator is driven to operate and generate electricity through the coupling. At the same time, the two pinions (transmission gears) of the low-speed shaft are respectively meshed with the emergency shut-off device and the cranking motor. The emergency shut-off device protects the unit from overspeed, and the cranking motor makes the turbine device start more smoothly.

[0026] The operating point temperature of the supercritical carbon dioxide turbine device is relatively high, at about 500-600°C. The connecting steam pipes need to be insulated, and the high and low pressure stage cylinders use flexible supports to avoid excessive deformation caused by thermal stress.

[0027] The turbine device adopts a lifting valve to perform speed regulation control.

[0028] The generator can use a motor with a lower speed, which has lower cost and is easier to implement technically.

[0029] The cranking motor can assist the turbine rotor to rotate more smoothly during startup. After reaching a certain speed, the cranking motor will be disengaged without affecting the normal work of the turbine device.

[0030] The emergency shut-off device cuts off the main steam valve air intake when the speed exceeds the rated value, protecting the turbine device from overspeeding.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A gearbox type supercritical carbon dioxide turbine device, characterized in that: The invention comprises a gearbox (3) and a generator (9), wherein the gearbox (3) has a low-speed shaft (34) and a high-speed shaft (313), the low-speed shaft (34) of the gearbox (3) is connected to the generator (9) by power, and a high-pressure stage (8) and a low-pressure stage (4) of a turbine are arranged at both ends of the high-speed shaft of the gearbox (3), and the flow passages of the high-pressure stage (8) and the low-pressure stage (4) of the turbine are connected via a connecting steam pipe (5).

2. A gearbox type supercritical carbon dioxide turbine device according to claim 1, characterized in that: It also includes an oil station, which is arranged at the lower end of the gear box (3) and is connected to the gear box (3) and the generator (9). The oil station is used to provide lubricating oil to the gear box (3) and the generator (9).

3. The gearbox type supercritical carbon dioxide turbine device according to claim 1, characterized in that: The high pressure stage (8) of the turbine is on the same side as the generator (9).

4. The gearbox type supercritical carbon dioxide turbine device according to claim 1, characterized in that: The air inlet of the high-pressure stage (8) of the turbine is provided with a lift valve (7) and a main steam valve (6).

5. The gearbox type supercritical carbon dioxide turbine device according to claim 1, characterized in that: It also includes a cranking motor (2) and a crisis isolation device (11). Two transmission gears are provided on the low-speed shaft (34). Input gears are respectively provided on the input shafts of the cranking motor (2) and the crisis isolation device (11). Each input gear is respectively meshed with a corresponding transmission gear on the low-speed shaft (34).

6. The gearbox type supercritical carbon dioxide turbine device according to claim 1, characterized in that: The low-speed shaft (34) and the high-speed shaft (313) are arranged on the center plane of the gearbox (3) and are driven by gears. End face teeth are respectively provided at both ends of the high-speed shaft (313), and the end face teeth are connected to the high-pressure stage turbine / low-pressure stage turbine of the turbine.

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