Steam-water system started by high-temperature gas cooled reactor steam generator and use method of steam-water system

Abstract

The invention relates to the technical field of gas cooled reactor operation, and discloses a steam-water system started by a steam generator of a high-temperature gas cooled reactor and a using method of the steam-water system. The steam-water system comprises a condenser, a deaerator, a main water feeding pump, an auxiliary water feeding pump, a gas-liquid separator, an adjusting mechanism, an evaporator and a steam turbine; circulating water is heated through the deaerator, steam and water are separated through the gas-liquid separator, the flow and pressure of the steam are adjusted through the adjusting mechanism, in the starting process, the steam can be transmitted to the deaerator through the gas-liquid separator and the steam turbine, water supplied to the evaporator is heated, heat is effectively recycled, thermal shock to the condenser is avoided, and the service life of the condenser is prolonged. Meanwhile, water is supplied to the evaporator through the main water feeding pump and the auxiliary water feeding pump, water supply is finely adjusted through the auxiliary water feeding pump with small power so as to adjust water supply of the evaporator in real time, the technical problems that in the prior art, heat loss is large, and the service life of a condensing device is shortened are solved, and the purposes of small heat loss and low energy consumption are achieved. And the service life of the condensing device is longer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas cooled reactor operation, in particular to a steam-water system for starting a high-temperature gas cooled reactor steam generator and a use method thereof. BACKGROUND

[0002] With the development of nuclear power technology, once-through steam generators have attracted attention and been applied in the field of nuclear power due to their unique structure and operating characteristics. Once-through steam generators have the advantages of compact structure and high heat transfer efficiency, and are particularly suitable for some specially designed nuclear reactors or small modular nuclear power plants. During the starting process of the once-through steam generator, the feed water undergoes the processes of subcooled water, saturated steam and superheated steam after the heat exchanger, and has the operating characteristics of complex heat transfer and easy drift of phase transition points. The steam-water separation device of the traditional boiler once-through evaporator is arranged between the saturated section and the superheated section, and during the starting process, the external steam-water separation device is often matched.

[0003] The once-through steam generator with the external steam-water separation device cannot accurately control the humidity and quality of the steam by controlling the water level of the steam-water separation device like the traditional boiler. In actual production, the starting of the system can only be completed by controlling the feed water flow, which leads to frequent adjustment of the feed water system, poor adjustment accuracy, large heat loss of the system, and affects the economy of the unit operation. At the same time, at the initial stage of the unit starting, the steam-water separation device discharges the steam and water produced to the condensing device, which causes a large thermal load and thermal shock to the condensing device, and the condensing device is easily damaged. SUMMARY

[0004] The purpose of the present application is to provide a steam-water system for starting a high-temperature gas cooled reactor steam generator and a use method thereof, which solves the technical problems of large heat loss in the prior art and shortens the service life of the condensing device.

[0005] In order to solve the above technical problems, the present application provides a steam-water system for starting a high-temperature gas cooled reactor steam generator, comprising: an evaporator connected to a reactor for absorbing heat of the reactor; a steam turbine connected to the outlet of the evaporator through a steam inlet pipeline, the steam turbine generates electricity by using steam; Further comprising: a condenser connected to the outlet of the steam turbine, the condenser is connected to the outlet of the evaporator through a bypass pipeline, and the condenser is used for condensing the steam discharged by the steam turbine and the evaporator; a deaerator connected to the outlet of the condenser, the deaerator is connected to the outlet of the steam turbine through a steam extraction pipeline; a main feed water pump and a secondary feed water pump, the main feed water pump is connected with the deaerator and the evaporator respectively, the secondary feed water pump is connected with the deaerator and the evaporator respectively, and the power of the main feed water pump is greater than that of the secondary feed water pump; a gas-liquid separator connected with the outlet of the evaporator through a gas-liquid separation pipeline, and connected with the deaerator; an adjusting mechanism, one end of which is connected with the outlet of the evaporator through an adjusting pipeline, and the other end of which is connected with the deaerator.

[0006] In an optional embodiment, a condensate heater is further included, an inlet of the condensate heater is connected with a drain end of the gas-liquid separator, the inlet of the condensate heater is also connected with the outlet of the condenser, and an outlet of the condensate heater is connected with the deaerator.

[0007] In an optional embodiment, a drive pump is further included, an inlet of the drive pump is connected with the outlet of the condenser, an outlet of the drive pump is connected with the deaerator, and the outlet of the drive pump is also connected with the condensate heater through a water supply heating pipeline.

[0008] In an optional embodiment, a water source is further included, the water source is connected with the inlet of the drive pump, and the water source is used to supply water into the deaerator through the drive pump.

[0009] In an optional embodiment, a bypass valve is arranged on the bypass pipeline.

[0010] In an optional embodiment, a discharge pipeline is further included; one end of the discharge pipeline is connected at the outlet of the evaporator, a discharge valve is arranged on the discharge pipeline, and the discharge pipeline is used to discharge excess steam generated by the evaporator.

[0011] The application also provides a use method of the steam-water system based on the high-temperature gas cooled reactor steam generator, which comprises the following steps: starting the reactor, opening the main feed water pump, starting heat exchange between the reactor and the evaporator, and discharging the mixture of steam and liquid from the outlet of the evaporator, at this time, the evaporator is communicated with the gas-liquid separator; firstly, increasing the load of the reactor, changing the mixture of steam and liquid into single-phase saturated steam from the outlet of the evaporator, gradually closing the communication between the evaporator and the gas-liquid separator, gradually opening the communication between the evaporator and the adjusting mechanism, and adjusting the temperature and pressure of the steam discharged from the evaporator by the adjusting mechanism; When the reactor is loaded again, the evaporator outlet discharge changes from single-phase saturated steam to superheated steam, the adjusting mechanism adjusts the steam pressure and temperature discharged by the evaporator until the steam pressure reaches the critical load of the steam turbine, the communication between the evaporator and the steam turbine is gradually opened, and the communication between the evaporator and the adjusting mechanism is gradually closed; The flow rates of the main feed water pump and the auxiliary feed water pump are adjusted so that the flow rate of the water flow meets the requirements of the evaporator and ensures that the water supply of the evaporator is more stable. When the reactor is loaded again, the evaporator outlet discharge changes from single-phase saturated steam to superheated steam, the adjusting mechanism adjusts the steam pressure and temperature discharged by the evaporator until the steam pressure reaches the critical load of the steam turbine, the communication between the evaporator and the steam turbine is gradually opened, and the communication between the evaporator and the adjusting mechanism is gradually closed;

[0012] In an optional embodiment, after the reactor is loaded again, the air extraction pipeline is opened to heat the deaerator by the steam turbine, so as to stabilize the power generation of the steam turbine.

[0013] In an optional embodiment, during operation, when the steam pressure exceeds the rated pressure, the discharge valve is opened to discharge steam to the outside through the discharge pipeline, thereby reducing the steam pressure.

[0014] In an optional embodiment, when the reactor is loaded for the first time, the opening range of the bypass valve is controlled by adjusting the opening and closing of the bypass valve, so as to control the flow of steam into the gas-liquid separator, thereby adjusting the temperature in the deaerator.

[0015] This invention provides a steam-water system for starting a high-temperature gas-cooled reactor steam generator, comprising: a condenser connected to the turbine outlet and a bypass line connected to the evaporator outlet, the condenser being used to condense the steam discharged from the turbine and evaporator; a deaerator connected to the condenser outlet and a suction line connected to the turbine outlet; a main feedwater pump and an auxiliary feedwater pump, the main feedwater pump being connected to the deaerator and evaporator respectively, the auxiliary feedwater pump being connected to the deaerator and evaporator respectively, the main feedwater pump having a higher power than the auxiliary feedwater pump; a gas-liquid separator connected to the evaporator outlet via a gas-liquid separation line and connected to the deaerator; and a regulating mechanism, one end of which is connected to... The regulating pipeline is connected to the outlet of the evaporator, and the other end of the regulating mechanism is connected to the deaerator. The deaerator heats the circulating water, the gas-liquid separator separates steam and water, and the regulating mechanism regulates the flow and pressure of steam. During startup, the gas-liquid separator and the turbine exhaust can be used to transfer steam to the deaerator to heat the water supplied to the evaporator, effectively recovering heat and avoiding thermal shock to the condenser. At the same time, water is supplied to the evaporator through the main feed water pump and the auxiliary feed water pump. The water supply to the evaporator is finely adjusted by the low-power auxiliary feed water pump to regulate the water supply to the evaporator in real time. This solves the technical problems of large heat loss and shortened service life of the condensing unit in the existing technology, and achieves the technical effect of small heat loss and longer service life of the condensing unit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the steam-water system for starting up the high-temperature gas-cooled reactor steam generator mentioned in this embodiment of the invention.

[0017] In the diagram, 1-Reactor; 2-Evaporator; 3-Steam turbine; 4-Condenser; 5-Drive pump; 6-Deaerator; 7-Main feedwater pump; 8-Auxiliary feedwater pump; 9-Regulating mechanism; 10-Gas-liquid separator; 11-Condensate heater; 12-Discharge pipeline; 13-Steam inlet pipeline; 14-Bypass pipeline; 15-Regulating pipeline; 16-Gas-liquid separation pipeline; 17-Drainage heating pipeline; 18-Main feedwater pipeline; 19-Auxiliary feedwater pipeline; 20-Extraction pipeline. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In related technologies, DC steam generators with externally configured steam-water separators cannot precisely control the humidity and quality of steam by controlling the water level of the steam-water separator, as is the case with traditional boilers. In actual production, the system can only be started by controlling the feedwater flow rate, which leads to frequent and inaccurate adjustments to the feedwater system, resulting in significant heat loss and affecting the economic efficiency of the unit. At the same time, during the initial startup phase, the steam-water separator discharges the generated steam and water to the condenser, causing a large heat load and thermal shock to the condenser, which is prone to damage.

[0021] In view of this, such as Figure 1 As shown, some embodiments of the present invention provide a steam-water system for starting a high-temperature gas-cooled reactor steam generator, comprising: an evaporator 2 connected to a reactor 1 for absorbing heat from the reactor 1; a steam turbine 3 connected to the outlet of the evaporator 2 via a steam inlet pipeline 13, the steam turbine 3 generating electricity using steam; further comprising: a condenser 4 connected to the outlet of the steam turbine 3 and connected to the outlet of the evaporator 2 via a bypass pipeline 14, the condenser 4 condensing the steam discharged from the steam turbine 3 and the evaporator 2; and a deaerator 6 connected to the outlet of the condenser 4. The deaerator 6 is connected to the outlet of the turbine 3 via the extraction pipeline 20; the main feedwater pump 7 and the auxiliary feedwater pump 8 are connected, with the main feedwater pump 7 connected to both the deaerator 6 and the evaporator 2, and the auxiliary feedwater pump 8 connected to both the deaerator 6 and the evaporator 2, respectively. The power of the main feedwater pump 7 is greater than that of the auxiliary feedwater pump 8; the gas-liquid separator 10 is connected to the outlet of the evaporator 2 via the gas-liquid separation pipeline 16, and is also connected to the deaerator 6; the regulating mechanism 9 has one end connected to the outlet of the evaporator 2 via the regulating pipeline 15, and the other end connected to the deaerator 6.

[0022] In the above embodiment, the evaporator 2 can be connected to the reactor 1 through two pipes. The heat from the reaction in the reactor 1 flows into the first passage of the evaporator 2, and after heat exchange, flows back to the reactor 1 to absorb heat again. The second passage of the evaporator 2 can heat the circulating water into steam and catalyze the turbine 3 to generate electricity. The main feedwater pump 7 is connected to the same pipeline through the main feedwater pipeline 18, and the auxiliary feedwater pump 8 is connected to the same pipeline through the auxiliary feedwater pipeline 19, supplying water to the second passage of the evaporator 2. The inlets of both the main feedwater pump 7 and the auxiliary feedwater pump 8 are connected to the deaerator 6. The main feedwater pump 7 has a larger power, while the auxiliary feedwater pump 8 has a smaller power. In the feedwater flow regulation of the evaporator 2, the main feedwater pump 7 is used to supply a large amount of water to the evaporator 2, while the auxiliary feedwater pump 8 is used to precisely regulate the flow of water to the evaporator 2. The water supply is adjusted to ensure more precise water supply to evaporator 2, avoiding insufficient heat exchange and preventing incomplete steam generation at the outlet of evaporator 2 due to excessive water supply. Gas-liquid separator 10 is used in the initial stage to separate liquid water and steam by opening the valve on gas-liquid separation pipeline 16 when encountering incomplete steam. The liquid water is then reheated and flows into deaerator 6 along with the steam. Deaerator 6 uses the steam from gas-liquid separator 10 to reheat and deoxygenate the water, reducing the oxygen content. The outlet of evaporator 2 can also be connected to turbine 3. Once the steam emitted by evaporator 2 reaches the power generation threshold, turbine 3 is activated and power generation begins. The steam then passes through turbine 3 and enters condenser 4 for condensation before being sent to deaerator 6 for deoxygenation.

[0023] The regulating mechanism 9 can use spray cold water to cool the steam, preventing excessively hot steam from damaging downstream equipment and parts. When there is a lot of steam at the outlet of evaporator 2 and the gas-liquid separator 10 cannot handle the excessive steam, resulting in internal imbalance, the bypass line 14 can be opened to allow some of the steam in evaporator 2 to enter condenser 4 for condensation. After a small amount of steam is condensed, it continues to flow back to deaerator 6 for use, avoiding water waste and also preventing a large amount of steam from impacting condenser 4 and causing damage to condenser 4.

[0024] In the connection between the steam turbine 3 and the deaerator 6, the steam turbine 3 can be equipped with an extraction pipeline 20, and an extraction valve is installed on the extraction pipeline 20. After the extraction valve is opened, some of the steam on the steam turbine 3 will enter the deaerator 6 through the extraction pipeline 20 to heat the water in the deaerator 6, thereby avoiding energy waste.

[0025] Some embodiments of the present invention provide a steam-water system for starting a high-temperature gas-cooled reactor steam generator, comprising: a condenser 4 connected to the outlet of a steam turbine 3, and connected to the outlet of an evaporator 2 via a bypass pipeline 14, the condenser 4 being used to condense the steam discharged from the steam turbine 3 and the evaporator 2; a deaerator 6 connected to the outlet of the condenser 4, and connected to the outlet of the steam turbine 3 via an extraction pipeline 20; a main feedwater pump 7 and an auxiliary feedwater pump 8, the main feedwater pump 7 being connected to the deaerator 6 and the evaporator 2 respectively, the auxiliary feedwater pump 8 being connected to the deaerator 6 and the evaporator 2 respectively, the power of the main feedwater pump 7 being greater than the power of the auxiliary feedwater pump 8; a gas-liquid separator 10 connected to the outlet of the evaporator 2 via a gas-liquid separation pipeline 16, and connected to the deaerator 6; and a regulating mechanism 9. One end of the regulating mechanism 9 is connected to the outlet of the evaporator 2 via the regulating pipeline 15, and the other end is connected to the deaerator 6. The deaerator 6 heats the circulating water, the gas-liquid separator 10 separates the steam and water, and the regulating mechanism 9 regulates the flow rate and pressure of the steam. During startup, the gas-liquid separator 10 can transfer the steam to the deaerator 6, or the steam can be drawn from the turbine 3 and sent to the extraction pipeline 20 to heat the water supplied to the evaporator 2, effectively recovering heat and avoiding thermal shock to the condenser 4. At the same time, the main feed water pump 7 and the auxiliary feed water pump 8 supply water to the evaporator 2 respectively. The auxiliary feed water pump 8 with lower power is used to fine-tune the water supply to the evaporator 2 in real time, which solves the technical problems of large heat loss and shortened service life of the condensing device in the prior art, and achieves the technical effect of small heat loss and longer service life of the condensing device.

[0026] In an optional embodiment, a condensate heater 11 is also included. The inlet of the condensate heater 11 is connected to the condensate drain end of the gas-liquid separator 10. The inlet of the condensate heater 11 is also connected to the outlet of the condenser 4. The outlet of the condensate heater 11 is connected to the deaerator 6.

[0027] In the water supply embodiment, the condensate heater 11 is installed on one side of the deaerator 6. The condensate heater 11 is used to collect the water obtained after condensation by the condenser 4 and the water separated by the gas-liquid separator 10, and then heats and delivers it to the deaerator 6. Thus, the condensate heater 11 can control the overall temperature of the system and also provide pressure buffer for the deaerator 6.

[0028] In an optional embodiment, a drive pump 5 is also included. The inlet of the drive pump 5 is connected to the outlet of the condenser 4, the outlet of the drive pump 5 is connected to the deaerator 6, and the outlet of the drive pump 5 is also connected to the condensate heater 11 via a hydrophobic heating pipeline 17.

[0029] In the above embodiment, the drive pump 5 can be a metering pump. The drive pump 5 can discharge the water condensed in the condenser 4 into the deaerator 6 or the condensate heater 11. When the temperature of the water driven in the drive pump 5 is low, the condensate heating pipeline 17 can be opened first, and the drive pump 5 discharges the condensate into the condensate heater 11 for heating. The heated water is then sent to the deaerator 6 for deoxygenation. When the temperature of the water in the drive pump 5 is high, it can be directly sent to the deaerator 6 for use.

[0030] In an optional embodiment, a water source is also included, which is connected to the inlet of the drive pump 5, and the water source is used to supply water to the deaerator 6 through the drive pump 5.

[0031] In the above embodiment, the water source can be supplied by a water tower. The water source can be directly connected to the drive pump 5 and pumped into the deaerator 6 through the drive pump 5. At the beginning of the reactor 1, the water source can supply water to the system through the drive pump 5 to meet the system requirements and also to supplement the water that is missing in the system.

[0032] In an optional embodiment, a bypass valve is provided on the bypass line 14.

[0033] In the above embodiment, the bypass valve is used to control the opening and closing of the bypass pipeline 14. In the initial stage of unit startup, the pressure in the entire system is low, and the gas-liquid separator 10 and the regulating mechanism 9 can regulate the pressure and temperature of water vapor in the system without the need to use the bypass pipeline 14. However, as the load on reactor 1 gradually increases, the pressure in the system gradually increases. When the regulating mechanism 9 is insufficient to regulate the steam temperature and pressure in the system, the bypass valve can be opened slightly to release the system pressure through the condenser 4, thus avoiding excessive pressure that could lead to danger.

[0034] In an optional embodiment, a discharge line 12 is also included; one end of the discharge line 12 is connected to the outlet of the evaporator 2, and a discharge valve is provided on the discharge line 12. The discharge line 12 is used to discharge excess steam generated by the evaporator 2.

[0035] In the above embodiment, the discharge pipeline 12 can be made of metal. The discharge pipeline 12 is connected to the outlet of the evaporator 2. A discharge valve is provided on the discharge pipeline 12. When the reactor 1 gradually increases the load and the pressure in the system is too high, the pressure in the system can be reduced by opening the discharge valve to release the steam, thereby effectively avoiding the danger caused by excessive pressure.

[0036] Some embodiments of the present invention also provide a method for using a steam-water system based on the startup of a high-temperature gas-cooled reactor steam generator, including the following steps: starting the reactor 1, turning on the main feedwater pump 7, so that the reactor 1 and the evaporator 2 begin to exchange heat. The evaporator 2 outlet discharge is a mixture of steam and liquid. At this time, the evaporator 2 is connected to the gas-liquid separator 10. The gas-liquid separator 10 separates the steam and liquid. The liquid flows into the condensate heater 11 for heating, while the steam enters the deaerator 6 to heat the liquid water inside. Then the water in the deaerator 6 enters the evaporator 2 for heat exchange via the main feedwater pump 7 and the auxiliary feedwater pump 8.

[0037] Then, the load on reactor 1 is increased first, and the discharge from evaporator 2 changes from a mixture of steam and liquid to single-phase saturated steam. During the above process, the connection between evaporator 2 and gas-liquid separator 10 is gradually closed, that is, the valve on gas-liquid separation pipeline 17 is gradually closed. The connection between evaporator 2 and regulating mechanism 9 is gradually opened, that is, the valve on regulating pipeline 15 is gradually opened. Regulating mechanism 9 regulates the temperature and pressure of the steam discharged from evaporator 2 and sprays cooling water on the steam to prevent the steam temperature from becoming too high.

[0038] Then, the load on reactor 1 is increased again, and the effluent from the outlet of evaporator 2 changes from single-phase saturated steam to superheated steam. The regulating mechanism 9 adjusts the steam pressure and temperature discharged from evaporator 2 until the steam pressure reaches the critical load of turbine 3. The steam inlet pipeline 13 is gradually opened to connect evaporator 2 with turbine 3, and the connection between evaporator 2 and regulating mechanism 9 is gradually closed. The flow rates of the main feedwater pump 7 and auxiliary feedwater pump 8 are adjusted to ensure that the water flow rate meets the requirements of evaporator 2 and to ensure that the feedwater supply to evaporator 2 is more stable.

[0039] Continue to increase the load on reactor 1. The steam discharged from the outlet of evaporator 2 meets the rated load of turbine 3. The critical load of turbine 3 can be 30% of the rated load. At this time, reactor 1 is increased to full power, and the steam-water circulation during the unit startup process is completed.

[0040] In an optional implementation, after the reactor 1 is loaded again, the evacuation line 20 is opened to allow the turbine 3 to evacuate gas and heat the deaerator 6, thereby stabilizing the power generation of the turbine 3.

[0041] In an optional implementation, during operation, when the steam pressure exceeds the rated pressure, the discharge valve is opened to discharge steam through the discharge pipeline 12, thereby reducing the steam pressure.

[0042] In an optional implementation, when the reactor 1 is initially loaded, the opening range of the bypass valve is controlled by adjusting the opening and closing of the bypass valve, thereby controlling the flow rate of steam entering the gas-liquid separator 10, and thus regulating the temperature inside the deaerator 6.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steam-water system for starting up a high-temperature gas-cooled reactor steam generator, comprising: An evaporator, connected to the reactor, is used to extract heat from the reactor; A steam turbine, wherein the steam turbine is connected to the outlet of the evaporator via a steam inlet pipeline, and the steam turbine generates electricity using steam; Its characteristic is that it further includes: A condenser is connected to the outlet of the steam turbine and to the outlet of the evaporator via a bypass line. The condenser is used to condense the steam discharged from the steam turbine and the evaporator. A deaerator is connected to the outlet of the condenser and to the outlet of the steam turbine via an extraction pipeline. A main feedwater pump and an auxiliary feedwater pump are provided. The main feedwater pump is connected to the deaerator and the evaporator, respectively. The auxiliary feedwater pump is also connected to the deaerator and the evaporator, respectively. The power of the main feedwater pump is greater than that of the auxiliary feedwater pump. A gas-liquid separator is provided, which is connected to the outlet of the evaporator via a gas-liquid separation pipeline and is also connected to the deaerator. The regulating mechanism has one end connected to the outlet of the evaporator via a regulating pipeline, and the other end connected to the deaerator.

2. The steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, It also includes a condensate heater, the inlet of which is connected to the condensate drain end of the gas-liquid separator, the inlet of which is also connected to the outlet of the condenser, and the outlet of which is connected to the deaerator.

3. The steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 2, characterized in that, It also includes a drive pump, the inlet of which is connected to the outlet of the condenser, the outlet of which is connected to the deaerator, and the outlet of which is also connected to the condensate heater via a water heating pipeline.

4. The steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 3, characterized in that, It also includes a water source, which is connected to the inlet of the drive pump, and the water source is used to supply water to the deaerator through the drive pump.

5. The steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, A bypass valve is installed on the bypass pipeline.

6. The steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, This also includes discharge pipelines; One end of the discharge pipeline is connected to the outlet of the evaporator, and a discharge valve is installed on the discharge pipeline. The discharge pipeline is used to discharge excess steam generated by the evaporator.

7. A method of using a steam-water system for starting a high-temperature gas-cooled reactor steam generator as described in any one of claims 1-6, characterized in that, Includes the following steps: Start the reactor and turn on the main feedwater pump to allow the reactor and evaporator to begin heat exchange. The evaporator outlet discharge is a mixture of steam and liquid. At this time, the evaporator is connected to the gas-liquid separator. First, the reactor load is increased, and the evaporator outlet discharge changes from a mixture of steam and liquid to single-phase saturated steam. The connection between the evaporator and the gas-liquid separator is gradually closed, and the connection between the evaporator and the regulating mechanism is gradually opened. The regulating mechanism adjusts the temperature and pressure of the steam discharged from the evaporator. The reactor load is increased again, and the evaporator outlet discharge changes from single-phase saturated steam to superheated steam. The regulating mechanism adjusts the steam pressure and temperature discharged from the evaporator until the steam pressure reaches the turbine's critical load. The connection between the evaporator and the turbine is gradually opened, and the connection between the evaporator and the regulating mechanism is gradually closed. Adjust the flow rates of the main feed water pump and the auxiliary feed water pump to ensure that the water flow rate meets the requirements of the evaporator and to ensure that the water supply to the evaporator is more stable. As the reactor load continues to increase, the steam discharged from the evaporator outlet meets the rated load of the steam turbine. At this point, the reactor reaches full power, completing the steam-water circulation during the unit startup process.

8. The method of using the steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 7, characterized in that, After the reactor load is increased again, the extraction line is opened to allow the turbine to heat the deaerator, thus stabilizing the turbine's power generation.

9. The method of using the steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 7, characterized in that, During operation, when the steam pressure exceeds the rated pressure, the discharge valve is opened to discharge steam through the discharge pipeline, thereby reducing the steam pressure.

10. The method of using the steam-water system for starting up a high-temperature gas-cooled reactor steam generator according to claim 7, characterized in that, When initially increasing the reactor load, the opening range of the bypass valve is controlled by adjusting its opening and closing, thereby controlling the flow rate of steam entering the gas-liquid separator and thus regulating the temperature inside the deaerator.

Images