High temperature gas cooled reactor turbine emergency shutdown shaft seal temperature regulating system and method

Abstract

The system comprises a temperature adjusting device and a controller, the temperature adjusting device is arranged outside the shaft seal of the steam turbine, the controller is electrically connected with the steam turbine and the temperature adjusting device, and the controller is used for controlling the temperature adjusting device to heat the cold air entering the shaft seal under the action of internal and external pressure of the steam turbine to a first preset temperature and keep the temperature, so as to provide the shaft seal steam supply for the steam turbine after the emergency shutdown of the steam turbine. The system realizes the shaft seal heat preservation state after the emergency shutdown of the high-temperature reactor, prevents the steam turbine shaft from being deformed due to the loss of the steam turbine shaft seal steam supply, and ensures the safe shutdown of the steam turbine. The system realizes the driving of the air through the pressure difference between the internal and external environments of the steam turbine, heats and keeps the temperature of the cold air entering the shaft seal as the shaft seal steam supply, and is more stable and reliable in operation.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure belongs to the technical field of high temperature gas cooled reactor shaft seal system, and particularly relates to a high temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system and method. BACKGROUND

[0002] The high temperature gas cooled reactor adopts a once-through steam generator, and the generated steam parameters are high, so the shaft seal steam parameters required by the shaft seal steam supply system of the high temperature reactor turbine are also correspondingly increased. At present, the high temperature reactor adopts the form of auxiliary electric boiler + main steam system combined operation to provide the shaft seal steam with qualified parameters for the turbine at the initial start-up. During power operation, the shaft seal self-sealing of the turbine is realized through the shaft seal leakage of the turbine high pressure cylinder.

[0003] When the reactor is in emergency shutdown, due to the small amount of steam in the once-through steam generator, the residual steam of the main steam system cannot provide enough high temperature steam to realize the sealing of the turbine. The auxiliary electric boiler has a long start-up time and cannot realize the immediate start-up after the shutdown of the turbine, so it cannot provide the sealing of the turbine in time.

[0004] After the turbine loses the shaft seal steam supply, a large amount of cold air enters the high temperature turbine shaft neck, which may cause the bending of the turbine shaft and result in the damage of the turbine and even the turbine accident.

[0005] In view of the above problems, it is necessary to provide a high temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system and method which is reasonable in design and effective in solving the above problems. SUMMARY

[0006] The embodiment of the present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a high temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system and method.

[0007] One aspect of the embodiment of the present disclosure provides a high temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system, which comprises:

[0008] A temperature adjusting device is arranged outside the turbine shaft seal.

[0009] A controller is electrically connected with the turbine and the temperature adjusting device, respectively.

[0010] The controller is configured to heat the cold air entering the shaft seal under the action of the internal and external pressures of the turbine to a first preset temperature and keep the temperature, according to the emergency shutdown signal of the turbine and the internal vacuum signal of the turbine, so as to provide the shaft seal steam supply for the turbine after the emergency shutdown of the turbine.

[0011] Optionally, the controller is further configured to control the temperature adjusting device to heat the cold air entering the shaft seal under the pressure difference between the inside and outside of the steam turbine to a first preset temperature and keep the temperature when receiving the emergency shutdown signal of the steam turbine and the signal that the internal vacuum of the steam turbine is not zero.

[0012] Optionally, the controller is further configured to control the temperature adjusting device to gradually reduce the temperature of the steam supply to the shaft seal in the temperature keeping process to a second preset temperature according to the emergency shutdown signal of the steam turbine and the internal vacuum signal of the steam turbine, so as to realize safe shutdown of the steam turbine.

[0013] Optionally, the controller is further configured to control the temperature adjusting device to gradually reduce the temperature of the steam supply to the shaft seal in the temperature keeping process to a second preset temperature when receiving the signal that the rotating speed of the steam turbine is zero and the signal that the internal vacuum of the steam turbine is zero, so as to completely stop the temperature adjusting device.

[0014] Optionally, the controller is further configured to control the temperature adjusting device to make the change rate of the metal temperature of the shaft seal of the steam turbine be less than 10 ℃ / h during the process of gradually reducing the temperature of the steam supply to the shaft seal in the temperature keeping process.

[0015] The controller is further configured to completely stop the temperature adjusting device when the air temperature between the temperature adjusting device and the shaft seal of the steam turbine is less than 100 ℃.

[0016] Optionally, the controller is further configured to control the temperature adjusting device to be in a hot standby state according to the metal temperature of the shaft seal of the steam turbine and the air temperature between the temperature adjusting device and the shaft seal of the steam turbine when the steam turbine is in normal operation; wherein,

[0017] The temperature difference between the metal temperature of the shaft seal of the steam turbine and the air temperature between the temperature adjusting device and the shaft seal of the steam turbine ranges from -20 ℃ to +20 ℃.

[0018] Optionally, the system further comprises at least one first temperature measuring point and at least one second temperature measuring point, wherein the first temperature measuring point and the second temperature measuring point are electrically connected to the controller.

[0019] The first temperature measuring point is configured to measure the air temperature between the temperature adjusting device and the shaft seal of the steam turbine and transmit the air temperature to the controller.

[0020] The second temperature measuring point is configured to measure the temperature of the metal of the shaft seal of the steam turbine and transmit the temperature to the controller.

[0021] Optionally, the temperature adjusting device is an annular electric heater.

[0022] Optionally, the system further comprises a baffle and a tooth seal.

[0023] The baffle is arranged outside the temperature adjusting device, and the baffle is provided with an air inlet;

[0024] The tooth seal is arranged on the baffle and cooperates with a large turbine shaft gap.

[0025] Another aspect of the embodiment of the present disclosure provides a high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting method, which is adjusted by the system described above, and the method comprises the following steps:

[0026] The controller acquires a turbine emergency shutdown signal and a turbine internal vacuum signal, respectively;

[0027] The controller controls the temperature adjusting device to heat the cold air entering the shaft seal under the action of internal and external pressures of the turbine to a first preset temperature and keep the temperature, so as to provide shaft seal steam for the turbine after the turbine emergency shutdown.

[0028] The high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system and method of the embodiment of the present disclosure, in which the controller controls the temperature adjusting device to heat the cold air entering the shaft seal under the action of internal and external pressures of the turbine to a first preset temperature and keep the temperature, so as to provide shaft seal steam for the turbine after the turbine emergency shutdown. The system changes the traditional turbine shaft seal steam supply concept. After the turbine is shut down, and the reactor is shut down, the system does not rely on external steam supply. The system realizes air convection from the outside to the inside of the shaft seal through the pressure difference between the internal vacuum of the turbine and the external environment. The controller controls the temperature adjusting device to start heating and keeping the temperature of the cold air entering the shaft seal. The air in the keeping process serves as a shaft seal steam source to ensure the operation environment of the shaft seal, thereby ensuring the safe shutdown of the turbine.

[0029] The high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system of the embodiment of the present disclosure realizes the shaft seal keeping state after the high-temperature reactor emergency shutdown, prevents the turbine shaft from being deformed due to the loss of turbine shaft seal steam supply, and ensures the safe shutdown of the turbine.

[0030] The high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting system of the embodiment of the present disclosure does not provide shaft seal keeping steam supply through the traditional active steam supply system. The system realizes the driving of air through the pressure difference between the internal vacuum of the turbine and the external environment, heats and keeps the temperature of the cold air entering the shaft seal as a shaft seal steam source, and is more stable and reliable in operation. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1A structural schematic diagram of a high-temperature gas-cooled reactor turbine emergency shutdown post-seal temperature regulation system according to an embodiment of the present disclosure;

[0032] Figure 2 A flowchart of a high-temperature gas-cooled reactor turbine emergency shutdown post-seal temperature regulation method according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] As shown in the drawings, Figure 1 An aspect of the present disclosure provides a high-temperature gas-cooled reactor turbine emergency shutdown post-seal temperature regulation system 100, which is applied to a high-temperature gas-cooled reactor turbine, and the turbine includes a turbine main shaft 210 and a turbine seal 220. The system 100 includes a temperature regulation device 110 and a controller 120.

[0035] The temperature regulation device 110 is arranged outside the turbine seal 220.

[0036] It should be noted that in the present embodiment, the temperature regulation device 110 can adopt a ring-shaped electric heater, which is arranged outside the turbine seal 220, can heat the cold air entering the turbine seal 220, can also heat the heated air, and can also cool the heat-insulated air, thereby regulating the temperature of the air entering the turbine seal 220. Of course, the temperature regulation device 110 can also adopt other devices, as long as it can regulate the temperature of the air entering the turbine seal 220, and the present embodiment is not limited in this regard. It can be selected according to actual needs.

[0037] The controller 120 is electrically connected with the turbine and the temperature regulation device, respectively.

[0038] The controller is configured to control the temperature regulation device 110 to heat the cold air entering the seal under the action of the internal and external pressure of the turbine to a first preset temperature and to heat-insulate the cold air, so as to provide the turbine with a seal steam supply after the turbine is shut down in an emergency.

[0039] It should be noted that the controller 120 can be a PLC, MCU, or CPU, etc., which can be selected according to actual needs. In the present embodiment, the controller 120 adopts a PLC.

[0040] Specifically, when the steam turbine is in emergency shutdown, the steam turbine shaft seal 220 loses normal steam supply, at this time the steam turbine is still in a vacuum state, at the steam turbine shaft seal, due to the pressure between the external environment air pressure and the internal vacuum, the external cold air enters the steam turbine through the shaft seal 220. At this time, the processor 120 controls the temperature adjusting device 110 to heat the cold air entering the shaft seal to a first preset temperature and keep warm according to the steam turbine emergency shutdown signal and the steam turbine internal vacuum signal, so as to provide shaft seal steam for the steam turbine after the steam turbine is in emergency shutdown. That is to say, when the steam turbine is in emergency shutdown, the control temperature adjusting device 110 can heat the cold air entering the steam turbine to a first preset temperature and keep warm, which can be used as steam turbine shaft seal gas.

[0041] The high-temperature gas cooled reactor steam turbine emergency shutdown shaft seal temperature adjusting system of the embodiment of the present disclosure changes the traditional steam turbine shaft seal steam supply concept. After the steam turbine is in shutdown, and the reactor is in shutdown, the system does not rely on external steam supply. The system realizes the air convection from the outside to the inside at the steam turbine shaft seal through the pressure difference between the internal vacuum of the steam turbine and the external environment. The system controls the start of the temperature adjusting device to heat and keep warm the cold air entering the steam turbine, and the air in the keeping warm process is used as the shaft seal steam source to ensure the shaft seal running environment, thereby ensuring the safe shutdown of the steam turbine and preventing the steam turbine shaft from being deformed due to the loss of steam turbine shaft seal steam supply. In addition, the system does not provide shaft seal keeping warm steam through the traditional active steam supply system, but realizes the driving of air through the pressure difference between the internal vacuum of the steam turbine and the external environment, heats and keeps warm the cold air entering the shaft seal as the shaft seal steam source, and the system runs more stably and reliably.

[0042] Exemplarily, the high-temperature gas cooled reactor steam turbine emergency shutdown shaft seal temperature adjusting system 100 of the embodiment of the present disclosure further comprises at least one first temperature measuring point 130 and at least one second temperature measuring point 140, wherein the first temperature measuring point 130 and the second temperature measuring point 140 are electrically connected with the controller 120.

[0043] The first temperature measuring point 130 is used to measure the temperature of the air between the temperature adjusting device 110 and the steam turbine shaft seal 220 and transmit to the controller 120.

[0044] The second temperature measuring point 140 is used to measure the temperature of the steam turbine shaft seal metal and transmit to the controller.

[0045] It should be noted that in the embodiment, the system 100 comprises two first temperature measuring points 130 and two second temperature measuring points 140. The two first temperature measuring points 130 are arranged in the space between the temperature adjusting device 110 and the shaft seal 220, and can measure the temperature of the air between the temperature adjusting device 110 and the shaft seal 220, for example, the temperature of the air heated by the temperature adjusting device 110.

[0046] The two second temperature measuring points 140 are arranged close to the shaft seal metal, and can measure the temperature of the shaft seal metal. In the embodiment, the temperature of the air entering the shaft seal is adjusted according to the temperature of the shaft seal metal.

[0047] It should be further noted that the number of the first temperature measuring points 130 and the second temperature measuring points 140 is not limited, and can be selected according to actual needs.

[0048] It should be further noted that the first temperature measuring points 130 and the second temperature measuring points 140 can be temperature sensors, or other devices capable of measuring temperature, and the embodiment is not limited, and can be selected according to actual needs.

[0049] For example, the controller 120 is further configured to control the temperature adjusting device 110 to heat the cold air entering the shaft seal under the pressure difference between the inside and outside of the turbine to a first preset temperature and keep the temperature when receiving the emergency shutdown signal of the turbine and the signal that the vacuum inside the turbine is not zero.

[0050] Specifically, when the turbine motor starts to be shut down, the controller 120 receives the emergency shutdown signal of the turbine and the signal that the vacuum inside the turbine is not zero. At this time, the shaft seal air source is lost, but the inside of the turbine is still in a vacuum state. The cold air outside the turbine enters the inside of the turbine through the shaft seal 220 under the pressure difference between the inside and outside of the turbine. The controller 120 controls the electric heater to start, and heats the cold air entering the shaft seal to a first preset temperature. At this time, the first temperature measuring point 130 feeds back the measured first preset temperature to the controller 120. The controller 120 controls the electric heater to stop heating the air entering the shaft seal, and keeps the temperature of the heated air at the first temperature. The air in the keeping process can be used as the shaft seal air source to ensure the operation environment of the shaft seal.

[0051] In the embodiment, the heating temperature of the cold air entering the shaft seal is adjusted according to the temperature of the shaft seal metal of the turbine. The first preset temperature is consistent with the set temperature of the shaft seal metal of the turbine. Preferably, in the embodiment, the first preset temperature ranges from 100 to 121 degrees Celsius.

[0052] It should be noted that different steam turbine manufacturers require different set temperatures of the steam turbine shaft seal metal, and the selection can be made according to actual needs. The present embodiment is not specifically limited.

[0053] For example, the controller 120 is further configured to control the temperature adjusting device 110 to gradually reduce the steam supply to the shaft seal in the heat preservation to the second preset temperature according to the steam turbine emergency shutdown signal and the steam turbine internal vacuum signal, so as to realize the safe shutdown of the steam turbine.

[0054] For example, the controller 120 is further configured to control the temperature adjusting device 110 to gradually reduce the steam supply to the shaft seal in the heat preservation to the second preset temperature when receiving the steam turbine speed zero signal and the steam turbine internal vacuum zero signal, so as to completely stop the temperature adjusting device 110. It should be noted that the second preset temperature range is <100℃ in the present embodiment.

[0055] Specifically, after the steam turbine is completely stopped, the controller 120 receives the steam turbine speed zero signal, and then the controller 120 judges the steam turbine internal vacuum signal again. When the controller 120 receives the steam turbine speed zero signal and the steam turbine internal vacuum zero signal, it indicates that the steam turbine has been completely stopped at this time, and the steam turbine is not in a vacuum state, and the steam turbine shaft seal needs to be cooled down. The controller 120 starts to slowly stop the electric heater to gradually reduce the steam supply to the shaft seal in the heat preservation, wherein during the process of gradually reducing the steam supply to the shaft seal in the heat preservation by the temperature adjusting device 110, the steam turbine shaft seal metal temperature change rate measured by the second temperature measuring point 140 is ensured to be <10℃ / h. When the air temperature between the electric heater and the steam turbine shaft 220 seal measured by the first temperature measuring point 130 is <100℃, the first temperature measuring point 130 transmits the temperature to the controller 120, the controller 120 completely stops the electric heater, the shaft seal steam supply system is stopped, and the safe shutdown of the steam turbine is ensured.

[0056] In the present embodiment, the controller controls the temperature adjusting device to gradually reduce the steam supply to the shaft seal in the heat preservation to the second preset temperature when the steam turbine speed signal is zero and the steam turbine internal vacuum signal is also zero, so as to completely stop the temperature adjusting device. That is, the steam turbine shaft seal is slowly cooled down, which can prevent the steam turbine shaft seal from being cooled too quickly and deformed, causing damage to the steam turbine and even steam turbine accidents, and ensuring the safe and reliable shutdown of the steam turbine.

[0057] For example, the controller is further configured to control the temperature adjusting device to be in a hot standby state according to the steam turbine shaft seal metal temperature and the air temperature between the temperature adjusting device and the steam turbine shaft seal when the steam turbine is normally running.

[0058] The temperature difference between the metal temperature of the shaft seal of the turbine and the air temperature between the temperature adjusting device and the shaft seal of the turbine ranges from -20°C to +20°C.

[0059] Specifically, when the turbine is in normal operation, the controller 120 adjusts the temperature adjusting device 110 to be turned on according to the air temperature between the temperature adjusting device 110 and the shaft seal 220 of the turbine measured by the first temperature measuring point 130 and the metal temperature of the shaft seal of the turbine measured by the second temperature measuring point 140, and preheats the air between the temperature adjusting device 110 and the shaft seal 220 of the turbine, so that the temperature difference between the metal temperature of the shaft seal of the turbine and the air temperature between the temperature adjusting device and the shaft seal of the turbine ranges from -20°C to +20°C, so that the temperature adjusting device is in a hot standby state.

[0060] In the embodiment of the present disclosure, the system is in a hot standby state during operation through automatic control of the controller, and automatic shutdown of the system is realized through the turbine speed signal and the vacuum signal, thereby reducing unnecessary energy loss.

[0061] As shown in Figure 1 The system 100 further includes a baffle 150 and a tooth seal 160.

[0062] The baffle 150 is arranged outside the temperature adjusting device 110, and in this embodiment, the baffle 150 is annular and arranged outside the temperature adjusting device 110 to protect the temperature adjusting device 120.

[0063] The baffle 150 is provided with an air inlet 151, which functions as a flow guide. When the turbine is in emergency shutdown, external cold air enters the turbine through the air inlet 151.

[0064] The tooth seal 160 is arranged on the baffle 150 and cooperates with the turbine main shaft gap. Specifically, the tooth seal 160 is arranged in an annular shape and uses a high-low tooth structure to form a gap cooperation with the turbine main shaft 210, so as to ensure that the turbine main shaft 210 does not collide and grind with the sealing tooth during rotation. The tooth seal 160 cooperates with the turbine main shaft 210 to prevent air from entering the turbine through the tooth seal, thereby ensuring the normal rotation of the turbine main shaft. In addition, the tooth seal 160 can also prevent the leakage of the shaft seal air supply in the heat preservation.

[0065] As shown in Figure 2 Another aspect of the embodiment of the present disclosure provides a high-temperature gas-cooled reactor turbine emergency shutdown shaft seal temperature adjusting method S100, which uses the system 100 described above for adjustment. The structure of the system 100 has been described in detail above, and will not be described again here.

[0066] As shown in Figure 2As shown, the high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting method S100 of the embodiment of the present disclosure includes:

[0067] S110, the controller acquires the turbine emergency shutdown signal and the turbine internal vacuum signal respectively.

[0068] S120, the controller controls the temperature adjusting device to heat the cold air entering the shaft seal under the action of the internal and external pressure of the turbine to a first preset temperature and keep the temperature, so as to provide the shaft seal steam supply for the turbine after the turbine emergency shutdown according to the turbine emergency shutdown signal and the turbine internal vacuum signal.

[0069] It should be noted that the specific process of the high-temperature gas cooled reactor turbine emergency shutdown shaft seal temperature adjusting method S100 of the embodiment of the present disclosure is as follows:

[0070] When the turbine is normally running, the controller 120 controls the temperature adjusting device 110 to start according to the air temperature between the temperature adjusting device 110 and the turbine shaft seal 220 measured by the first temperature measuring point 130 and the turbine shaft seal metal temperature measured by the second temperature measuring point 140, preheats the air between the temperature adjusting device 110 and the turbine shaft seal 220, so that the turbine shaft seal metal temperature and the temperature difference range of the air temperature between the temperature adjusting device and the turbine shaft seal are-20℃ to +20℃, so that the temperature adjusting device is in a hot standby state.

[0071] When the turbine starts emergency shutdown, the turbine shaft seal 220 loses normal steam source, at this time, the turbine is still in a vacuum state, and the external cold air enters the turbine through the turbine shaft seal 220 due to the pressure action between the external environment air pressure and the internal vacuum at the turbine shaft seal. The controller 120 receives the turbine emergency shutdown signal and the signal that the turbine internal vacuum is not zero, at this time, the shaft seal air source is lost, but the turbine internal vacuum is still in a vacuum state, the external cold air of the turbine enters the turbine internal through the shaft seal 220 under the action of the pressure difference between the turbine internal and external, the controller 120 controls the electric heater to start, heats the cold air entering the shaft seal to a first preset temperature, at this time, the first temperature measuring point 130 feeds back the measured first preset temperature to the controller 120, the controller 120 controls the electric heater to stop heating the air entering the shaft seal, and keeps the temperature of the heated air at the first temperature, so that the air in the keeping can be used as the shaft seal air source to ensure the shaft seal running environment.

[0072] After the turbine is completely stopped, the controller 120 receives a signal that the turbine rotation speed is zero, and then the controller 120 judges the turbine internal vacuum signal again. When the controller 120 receives the signal that the turbine rotation speed is zero and the signal that the turbine internal vacuum is zero, it is indicated that the turbine has been completely stopped and the turbine internal vacuum has been in a non-vacuum state, and the turbine shaft seal needs to be cooled. The controller 120 starts to slowly stop the electric heater to gradually cool the turbine shaft seal in the heat preservation, and in the process of gradually cooling the turbine shaft seal in the heat preservation by the temperature adjusting device 110, the change rate of the turbine shaft seal metal temperature measured by the second temperature measuring point 140 is ensured to be less than 10℃ / h. When the air temperature between the electric heater and the turbine shaft 220 seal measured by the first temperature measuring point 130 is less than 100℃, the first temperature measuring point 130 transmits the temperature to the controller 120, the controller 120 completely stops the electric heater, the turbine shaft seal steam supply system is stopped, and the safe stop of the turbine is ensured.

[0073] The turbine shaft seal temperature adjusting method after the emergency shutdown of the high-temperature gas cooled reactor turbine of the embodiment of the present disclosure changes the traditional turbine shaft seal steam supply concept. After the turbine is stopped, and the reactor is stopped, the turbine shaft seal is not dependent on external steam supply, and the air convection from the outside to the inside of the turbine shaft seal is realized through the pressure difference between the internal vacuum of the turbine and the external environment. The controller controls the temperature adjusting device to start heating and heat preservation of the cold air entering the shaft seal, the air in the heat preservation is used as the shaft seal steam source to ensure the operation environment of the shaft seal, and the safe stop of the turbine is ensured.

[0074] The turbine shaft seal temperature adjusting system after the emergency shutdown of the high-temperature gas cooled reactor turbine of the embodiment of the present disclosure realizes the heat preservation state of the shaft seal after the emergency shutdown of the high-temperature reactor, prevents the turbine shaft from being deformed due to the loss of turbine shaft seal steam supply, and ensures the safe stop of the turbine.

[0075] The turbine shaft seal temperature adjusting system after the emergency shutdown of the high-temperature gas cooled reactor turbine of the embodiment of the present disclosure does not provide shaft seal heat preservation steam supply through the traditional active steam supply system, realizes the driving of air through the pressure difference between the internal vacuum of the turbine and the external environment, heats and heat preserves the cold air entering the shaft seal as the shaft seal steam source, and the operation is more stable and reliable.

[0076] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principles of the embodiments of the present disclosure, and the embodiments of the present disclosure are not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the embodiments of the present disclosure.

Claims

1. A shaft seal temperature regulation system after an emergency shutdown of a high-temperature gas-cooled reactor turbine, characterized in that, The system includes: A temperature regulating device is installed around the outside of the turbine shaft seal; The controller is electrically connected to both the steam turbine and the temperature control device, wherein... The controller is used to control the temperature regulating device to heat the cold air entering the shaft seal under the action of internal and external pressure of the steam turbine to a first preset temperature and keep it warm, based on the emergency shutdown signal of the steam turbine and the vacuum signal inside the steam turbine, so as to provide steam to the shaft seal of the steam turbine after the emergency shutdown of the steam turbine. The system also includes baffles and toothed seals; The baffle is arranged around the outside of the temperature regulating device, and the baffle has an air inlet. The toothed seal is installed on the baffle and is clearance-fitted with the turbine shaft.

2. The system according to claim 1, characterized in that, The controller is also used to control the temperature regulating device to heat the cold air entering the shaft seal under the action of internal and external pressure of the steam turbine to a first preset temperature and keep it warm when it receives an emergency shutdown signal of the steam turbine and a signal that the vacuum inside the steam turbine is not zero.

3. The system according to claim 1, characterized in that, The controller is also used to control the temperature regulating device to gradually cool the steam supplied to the shaft seal during insulation to a second preset temperature based on the turbine emergency shutdown signal and the turbine internal vacuum signal, so as to achieve safe shutdown of the turbine.

4. The system according to claim 3, characterized in that, The controller is also used to control the temperature regulating device to gradually cool the steam supply to the shaft seal during insulation to a second preset temperature when it receives a signal that the turbine speed is zero and a signal that the internal vacuum of the turbine is zero, so as to completely shut down the temperature regulating device.

5. The system according to claim 4, characterized in that, The controller is also used to control the temperature regulating device to gradually cool down the steam supply to the shaft seal during the insulation process, so that the temperature change rate of the turbine shaft seal metal is <10℃ / h. The controller is also used to completely shut down the temperature regulating device when the air temperature between the temperature regulating device and the turbine shaft seal is <100°C.

6. The system according to claim 5, characterized in that, The controller is further configured to, during normal operation of the steam turbine, control the temperature regulating device to be in a hot standby state based on the metal temperature of the steam turbine shaft seal and the air temperature between the temperature regulating device and the steam turbine shaft seal; wherein... The temperature difference between the turbine shaft seal metal temperature and the air temperature between the temperature regulating device and the turbine shaft seal is -20℃ to +20℃.

7. The system according to any one of claims 1 to 6, characterized in that, The system further includes at least one first temperature measuring point and at least one second temperature measuring point, wherein both the first temperature measuring point and the second temperature measuring point are electrically connected to the controller; The first temperature measuring point is used to measure the air temperature between the temperature regulating device and the turbine shaft seal and transmit it to the controller; The second temperature measuring point is used to measure the temperature of the turbine shaft seal metal and transmit it to the controller.

8. The system according to any one of claims 1 to 6, characterized in that, The temperature regulating device is a ring-shaped electric heater.

9. A method for adjusting the shaft seal temperature after an emergency shutdown of a high-temperature gas-cooled reactor turbine, characterized in that, The system according to any one of claims 1 to 8 is used for adjustment, and the method includes: The emergency shutdown signal of the steam turbine and the vacuum signal inside the steam turbine are acquired respectively; The controller controls the temperature regulating device to heat the cold air entering the shaft seal under the action of internal and external pressure of the steam turbine to a first preset temperature and keep it warm, based on the emergency shutdown signal of the steam turbine and the internal vacuum signal of the steam turbine, so as to provide steam to the shaft seal of the steam turbine after the emergency shutdown of the steam turbine.

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