A high temperature gas cooled reactor steam generator water quality control system

Abstract

The application discloses a high-temperature gas cooled reactor steam generator steam-water quality control system, which comprises a reactor, a steam generator, a first valve group, a steam turbine, a condenser, a generator set, a second valve group, a third valve group, a water treatment device, a feed water pump, a fifth valve group, a sewage tank, a sixth valve group, a clean water tank and a seventh valve group. The system can guarantee stable operation of the gas cooled reactor in the case of steam generator water supply interruption and reactor shutdown accidents caused by steam-water quality.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power safety facilities technology and relates to a steam and water quality control system for a high-temperature gas-cooled reactor steam generator. Background Technology

[0002] High-temperature gas-cooled reactor steam generators are vertical, direct-flow spiral tube type, characterized by unstable two-phase flow and complex, variable boiling heat transfer. During operation, their steam and water quality requirements are significantly higher than those of pressurized water reactor units. According to historical nuclear power plant accident statistics, steam generator heat transfer tube blockage is the leading cause of unplanned shutdowns in pressurized water reactor nuclear power plants. This blockage is primarily due to deterioration in steam and water quality during operation; therefore, various methods are needed to ensure the reliability of steam and water quality in the steam generator.

[0003] Currently, in order to ensure that the heat transfer tubes are not damaged, if the steam and water quality of the high-temperature gas-cooled reactor steam generator is substandard, the secondary side of the steam generator will be shut down in an emergency, and the reactor will be forced to shut down in an emergency. This type of shutdown accident greatly restricts the economic efficiency of the unit operation and is not conducive to the long-term stable operation of the high-temperature gas-cooled reactor. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a steam-water quality control system for a high-temperature gas-cooled reactor steam generator. This system ensures the stable operation of the gas-cooled reactor in the event of steam generator water supply interruption or reactor shutdown due to steam-water quality issues.

[0005] To achieve the above objectives, this invention discloses a steam-water quality control system for a high-temperature gas-cooled reactor steam generator, comprising a reactor, a steam generator, a first valve group, a steam turbine, a condenser, a generator set, a second valve group, a third valve group, a water treatment device, a feedwater pump, a fifth valve group, a wastewater tank, a sixth valve group, a clean water tank, and a seventh valve group.

[0006] The reactor is connected to the primary side of the steam generator. The secondary side outlet of the steam generator is divided into two paths. One path connects to the turbine inlet via the first valve group, and the turbine exhaust port connects to the condenser inlet. The turbine is connected to the generator set. The other path connects to the condenser inlet via the second valve group. The condenser outlet is divided into two paths via the condensate pump. One path connects to the condenser inlet via the third valve group and the water treatment device. The other path connects to the feedwater pump inlet via the fourth valve group and the deaerator. The feedwater pump outlet is divided into three paths. The first path connects to the wastewater tank inlet via the fifth valve group, and the wastewater tank outlet connects to the water treatment device inlet. The second path connects to the clean water tank inlet via the sixth valve group. The third path connects to the clean water tank outlet via the seventh valve group and then, through a parallel pipeline, connects to the secondary side inlet of the steam generator.

[0007] The outlet of the sewage tank is connected to the inlet of the water treatment device via a sewage tank transfer pump.

[0008] It also includes a clean water tank transfer pump, with the outlet of the clean water tank connected to the inlet of the clean water tank transfer pump; the third route, after passing through the seventh valve group, is connected to the outlet of the clean water tank transfer pump via a pipeline and then connected to the secondary inlet of the steam generator.

[0009] It also includes a steam quality monitor, a condensate quality monitor, and a feedwater quality monitor. The steam quality monitor is connected to the pipeline between the secondary outlet of the steam generator and the first and second valve groups. The condensate quality monitor is connected to the pipeline between the condensate pump and the fourth valve group. The feedwater quality monitor is connected to the pipeline between the feedwater pump and the sixth and seventh valve groups.

[0010] When the water quality monitor detects that the water quality parameters are not up to standard, the following operations shall be performed:

[0011] 211) When the sixth and seventh valve groups are closed, the clean water tank delivery pump is started to deliver the water in the clean water tank to the steam generator, ensuring a stable water supply flow to the steam generator;

[0012] 212) Start the sewage tank transfer pump and open the fifth valve group. The water output from the water pump enters the sewage tank through the fifth valve group and is then transported by the sewage tank transfer pump to the water treatment device for treatment.

[0013] 213) The reactor and generator set operate at reduced power until the feedwater quality monitor shows normal operation. Then, open the seventh valve group, close the fifth valve group, stop the sewage tank transfer pump, and send the feedwater to the secondary side of the steam generator to absorb heat from the primary side. Gradually stop the clean water tank transfer pump, open the sixth valve group, and replenish the liquid level in the clean water tank to the preset high level.

[0014] 214) After confirming that the steam quality monitor, condensate quality monitor and feedwater quality monitor are all displaying normal values, the reactor and generator set power is increased to the initial state.

[0015] When the condensate quality monitor detects that the condensate parameters are not up to standard, the following operations should be performed:

[0016] 221) When the third valve group is open and the fourth valve group is closed, the condensate in the condenser is pumped to the water treatment unit for treatment by the condensate pump, and then returned to the condenser to form a circulation loop.

[0017] 222) The reactor and generator set operate at reduced power until the feedwater quality monitor shows normal operation. Then, open the fourth valve group and close the third valve group. After confirming that the steam quality monitor, condensate quality monitor, and feedwater quality monitor all show normal operation, the reactor and generator set increase power to the initial operating state.

[0018] When the steam quality monitor detects that the steam parameters are not up to standard, the following operations shall be performed:

[0019] 231) Close the first valve group, open the second valve group, open the third valve group, open the fifth valve group, start the sewage tank transfer pump, and transport the feed water output by the feed water pump to the water treatment device. Transport the condensate output by the condensate pump to the water treatment device. The condensate and feed water are discharged and purified by the water treatment device.

[0020] 232) The reactor operates at reduced power, the generator set is shut down, and after the steam quality monitor shows normal operation, the first valve group is opened, the turbine is started, and the generator set is under load. Then, the second, third and fifth valve groups are gradually closed.

[0021] 233) After confirming that the steam quality monitor, condensate quality monitor and feedwater quality monitor are all normal, the reactor and generator set are increased to the initial operating state.

[0022] When the steam quality monitor detects that the steam parameters are substandard, or the feedwater quality monitor detects that the feedwater parameters are substandard, the following operations shall be performed:

[0023] 241) The first valve group is closed, the second valve group is opened, the fifth valve group is opened, the seventh valve group is closed, the sewage tank transfer pump is started, and the feed water output by the feed water pump is transported to the water treatment device through the sewage tank transfer pump. The water treatment device purifies the feed water. The clean water tank transfer pump is started to transport the feed water in the clean water tank to the secondary side of the steam generator to ensure the stable feed water flow of the steam generator.

[0024] 242) The reactor operates at reduced power, and the turbine and generator set are shut down until the steam quality monitor and feedwater quality monitor show normal operation. Then, the first valve group is opened, the turbine is started up, and the generator set is under load. The second and fifth valve groups are gradually closed, the sewage tank transfer pump is shut down, the seventh valve group is opened, the clean water tank transfer pump is shut down, and the feedwater output by the feedwater pump is delivered to the secondary side of the steam generator to continue absorbing heat from the primary side of the steam generator.

[0025] 243) After confirming that the steam quality monitor, condensate quality monitor and feedwater quality monitor are all displaying normal values, the reactor and generator set are increased to the initial operating state.

[0026] When the steam quality monitor detects that the steam parameters are substandard, and the condensate quality monitor detects that the condensate parameters are substandard, the following operations shall be performed:

[0027] 251) Close the first valve group, open the second valve group, close the fourth valve group, open the third valve group, and the condensate is pumped to the water treatment unit for treatment and then returned to the condenser to form a circulation loop.

[0028] 252) The reactor operates at reduced power, and the turbine and generator set are shut down until the steam quality monitor and condensate quality monitor show normal readings. Then, the first valve group is opened, the turbine is started up, and the generator set is loaded. The second and third valve groups are then gradually closed.

[0029] 253) After confirming that the steam quality monitor, condensate quality monitor and feedwater quality monitor are all normal, the reactor and generator set are increased to the initial operating state.

[0030] If the steam quality monitor, condensate quality monitor, and feedwater quality monitor all detect that the steam and water quality are substandard, then proceed with the following steps:

[0031] 261) The first valve group, the fourth valve group, the sixth valve group, and the seventh valve group are all closed;

[0032] 262) Start the clean water tank transfer pump to deliver the feedwater in the clean water tank to the secondary side of the steam generator. The steam turbine and generator set are shut down. The reactor power is reduced until it is shut down. Then, the clean water tank transfer pump is shut down and the second valve group is closed.

[0033] 263) Open the third valve group and the fifth valve group, start the sewage tank transfer pump, and use the condensate pump, feed water pump and sewage tank transfer pump to transport the condensate and feed water to the water treatment device for purification treatment.

[0034] 264) After the steam quality monitor, condensate quality monitor and feedwater quality monitor all show normal readings, close the third valve group and the fifth valve group, and stop the sewage tank transfer pump.

[0035] 265) The first valve group, the fourth valve group, the sixth valve group and the seventh valve group are opened. The reactor starts up and is boosted to the preset power. Steam is generated at the secondary side outlet of the steam generator. The steam enters the steam turbine through the first valve group, which drives the steam turbine to do work and the generator set to generate electricity. The unit enters the load operation stage.

[0036] The present invention has the following beneficial effects:

[0037] In practical operation, the steam and water quality control system for the high-temperature gas-cooled reactor described in this invention can control the steam and water quality to meet standards by controlling each valve group and through the wastewater tank and water treatment device when any of the parameters of steam, condensate, and feedwater becomes abnormal. At the same time, a clean water tank and a clean water tank delivery pump are configured as the secondary auxiliary water supply circuit of the steam generator to ensure the stability of the feedwater flow rate of the steam generator under various operating conditions. This greatly avoids steam generator water supply interruption and reactor shutdown accidents caused by steam and water quality issues, and the system has high reliability. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention.

[0039] Among them, 1 is the reactor, 2 is the steam generator, 3 is the main helium blower, 4 is the first valve group, 5 is the second valve group, 6 is the steam turbine, 7 is the generator set, 8 is the condenser, 9 is the condensate pump, 10 is the third valve group, 11 is the water treatment device, 12 is the fourth valve group, 13 is the deaerator, 14 is the feedwater pump, 15 is the fifth valve group, 16 is the sewage tank, 17 is the sewage tank transfer pump, 18 is the sixth valve group, 19 is the clean water tank, 20 is the clean water tank transfer pump, 21 is the seventh valve group, 22 is the steam quality monitor, 23 is the condensate quality monitor, and 24 is the feedwater quality monitor. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0041] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0042] refer to Figure 1The high-temperature gas-cooled reactor steam generator steam-water quality control system of the present invention includes a reactor 1, a steam generator 2, a main helium blower 3, a steam turbine 6, a generator set 7, a condenser 8, a condensate pump 9, a water treatment device 11, a deaerator 13, a feedwater pump 14, a wastewater tank 16, a clean water tank 19, a wastewater tank transfer pump 17, a clean water tank transfer pump 20, a steam quality monitor 22, a condensate quality monitor 23, a feedwater quality monitor 24, a first valve group 4, a second valve group 5, a third valve group 10, a fourth valve group 12, a fifth valve group 15, a sixth valve group 18, and a seventh valve group 21.

[0043] The outlet of reactor 1 is connected to the shell-side inlet of steam generator 2. The shell-side outlet of steam generator 2 is connected to the inlet of main helium blower 3. The outlet of main helium blower 3 is connected to the inlet of reactor 1. The secondary outlet of steam generator 2 is divided into two paths. One path is connected to the inlet of turbine 6 via the first valve group 4. The output shaft of turbine 6 is connected to generator set 7. The exhaust port of turbine 6 is connected to the inlet of condenser 8. The other path is connected to the inlet of condenser 8 via the second valve group 5. The outlet of condenser 8 is connected to the inlet of condensate pump 9. The outlet of condensate pump 9 is divided into two paths. One path is connected to the inlet of water treatment device 11 via the third valve group 10. The outlet of water treatment device 11 is connected to... The inlet of condenser 8 is connected to the steam generator 2 via the fourth valve group 12. The outlet of deaerator 13 is connected to the inlet of feedwater pump 14. The outlet of feedwater pump 14 is divided into three paths. The first path is connected to the inlet of sewage tank 16 via the fifth valve group 15. The outlet of sewage tank 16 is connected to the inlet of sewage tank transfer pump 17. The outlet of sewage tank transfer pump 17 is connected to the inlet of water treatment device 11. The second path is connected to the inlet of clean water tank 19 via the sixth valve group 18. The outlet of clean water tank 19 is connected to the inlet of clean water tank transfer pump 20. The third path is connected to the outlet of clean water tank transfer pump 20 via the seventh valve group 21 and then connected to the secondary side inlet of steam generator 2 via a pipeline.

[0044] Among them, the first valve group 4, the second valve group 5, the third valve group 10, the fourth valve group 12, the fifth valve group 15, the sixth valve group 18 and the seventh valve group 21 are all composed of isolation valves and regulating valves.

[0045] The steam quality monitor 22 is connected to the secondary outlet of the steam generator 2 and the pipeline between the first valve group 4 and the second valve group 5. The condensate quality monitor 23 is connected to the pipeline between the condensate pump 9 and the fourth valve group 12. The feedwater quality monitor 24 is connected to the pipeline between the feedwater pump 14 and the sixth valve group 18 and the seventh valve group 21.

[0046] The steam-water quality control method for a high-temperature gas-cooled reactor steam generator according to the present invention includes the following steps:

[0047] Based on the steam and water quality of steam generator 2, there are 7 operating conditions, as shown in Table 1.

[0048] Table 1

[0049] Running status Steam quality Water supply quality Condensate quality Operating Condition 1 qualified qualified qualified Operating Condition 2 qualified Unqualified qualified Operating Condition 3 qualified qualified Unqualified Operating Condition 4 Unqualified qualified qualified Operating Condition 5 Unqualified Unqualified qualified Operating Condition 6 Unqualified qualified Unqualified Operating Condition 7 Unqualified Unqualified Unqualified

[0050] 1) The quality of the soft drink is normal.

[0051] System initial state: Reactor 1, steam turbine 6 and generator set 7 are not running, sewage tank transfer pump 17 and clean water tank transfer pump 20 are stopped, main helium blower 3 and condensate pump 9 are running, first valve group 4, fourth valve group 12 and seventh valve group 21 are open, second valve group 5, third valve group 10 and fifth valve group 15 are closed, and sixth valve group 18 is put into automatic mode.

[0052] 11) When reactor 1 starts up normally, the cold helium gas output by the main helium blower 3 enters the core of reactor 1 to absorb heat and become hot helium gas. The hot helium gas enters the shell side of steam generator 2 and exchanges heat with the feedwater in the tube side to become cold helium gas. The cold helium gas continues to return to the core of reactor 1 to absorb heat, so as to form a reactor 1 circulation loop.

[0053] 12) When reactor 1 is boosted to the preset power, steam is generated at the secondary side outlet of steam generator 2. The steam enters steam turbine 6 through the first valve group 4, driving steam turbine 6 to do work. Steam turbine 6 drives generator set 7 to generate electricity. The exhaust steam of steam turbine 6 enters condenser 8 and is condensed to form condensate. The condensate is transported to deaerator 13 by condensate pump 9, and then to secondary side of steam generator 2 by feedwater pump 14 to absorb heat from hot helium in steam generator 2 to form secondary side circulation loop of steam generator 2.

[0054] 13) The steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 monitor the steam and water quality of the unit in real time to ensure that the parameters are normal during the operation of the unit, the reactor 1 is running at full power and the generator set 7 is running at full load.

[0055] 2) Abnormal quality of soft drink

[0056] System initial state: Reactor 1, turbine 6 and generator set are operating normally, sewage tank transfer pump 17 and clean water tank transfer pump 20 are stopped, main helium blower 3 and condensate pump 9 are running, first valve group 4, fourth valve group 12 and seventh valve group 21 are open, second valve group 5, third valve group 10 and fifth valve group 15 are closed, and sixth valve group 18 is put into automatic mode.

[0057] 21) The water quality monitor 24 detected that the water quality parameters were not up to standard, and entered operating condition 2. The specific process is as follows:

[0058] 211) The sixth valve group 18 and the seventh valve group 21 are quickly closed, the clean water tank delivery pump 20 is started and the water in the clean water tank 19 is delivered to the steam generator 2 to ensure the stable water supply flow of the steam generator 2;

[0059] 212) Start the sewage tank transfer pump 17 and open the fifth valve group 15. The water output by the water pump 14 enters the sewage tank 16 through the fifth valve group 15, and is then transported by the sewage tank transfer pump 17 to the water treatment device 11 for treatment.

[0060] 213) Reactor 1 and generator set 7 operate at reduced power until the feedwater quality monitor 24 shows normal operation. Then, open the seventh valve group 21, close the fifth valve group 15, and stop the sewage tank transfer pump 17. Feedwater is transported to the secondary side of the steam generator 2 via the feedwater pump 14 to absorb heat from the primary side. Gradually stop the clean water tank transfer pump 20, open the sixth valve group 18, and replenish the liquid level in the clean water tank 19 to the preset high level.

[0061] 214) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the reactor 1 and generator set 7 are upgraded to the initial state.

[0062] 22) If the condensate quality monitor 23 detects that the condensate parameters are not up to standard, then the system will enter operating condition 3, specifically:

[0063] 221) The third valve group 10 is opened and the fourth valve group 12 is closed. The condensate in the condenser 8 is transported to the water treatment device 11 for treatment by the condensate pump 9, and then returned to the condenser 8 to form a circulation loop.

[0064] 222) Reactor 1 and generator set 7 operate at reduced power until the feedwater quality monitor 24 shows normal operation. Then, open the fourth valve group 12 and close the third valve group 10. After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 all show normal operation, reactor 1 and generator set 7 increase power to the initial operating state.

[0065] 23) If the steam quality monitor 22 detects that the steam parameters are not up to standard, then the system will enter operating condition 4, specifically:

[0066] 231) When the steam quality monitor 22 detects that the steam parameters are not up to standard, the first valve group 4 is closed, the second valve group 5 is opened, the third valve group 10 is opened, the fifth valve group 15 is opened, the sewage tank transfer pump 17 is started, the feed water output by the feed water pump 14 is transported to the water treatment device 11 by the sewage tank transfer pump 17, and the condensate output by the condensate pump 9 is transported to the water treatment device 11. The condensate and feed water are discharged and purified by the water treatment device 11 respectively.

[0067] 232) Reactor 1 operates at reduced power, generator set 7 is shut down until steam quality monitor 22 shows normal operation, then the first valve group 4 is opened, turbine 6 is started, generator set 7 is loaded, and then the second valve group 5, the third valve group 10 and the fifth valve group 15 are gradually closed.

[0068] 233) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0069] 24) If the steam quality monitor 22 detects that the steam parameters are substandard, and the feedwater quality monitor 24 detects that the feedwater parameters are substandard, then the system will enter operating condition 5, specifically:

[0070] 241) The first valve group 4 is closed, the second valve group 5 is open, the fifth valve group 15 is open, the seventh valve group 21 is closed, the sewage tank transfer pump 17 is started, and the feed water output by the feed water pump 14 is transported to the water treatment device 11 through the sewage tank transfer pump 17. The feed water is then purified by the water treatment device 11. The clean water tank transfer pump 20 is started, and the feed water in the clean water tank 19 is transported to the secondary side of the steam generator 2 to ensure a stable feed water flow rate of the steam generator 2.

[0071] 242) Reactor 1 operates at reduced power, turbine 6 and generator set 7 are shut down until steam quality monitor 22 and feedwater quality monitor 24 show normal readings. Then, the first valve group 4 is opened, turbine 6 is started, and generator set 7 is loaded. Then, the second valve group 5 and the fifth valve group 15 are gradually closed, sewage tank transfer pump 17 is shut down, the seventh valve group 21 is opened, clean water tank transfer pump 20 is shut down, and feedwater pump 14 outputs feedwater to the secondary side of steam generator 2 to continue absorbing heat from the primary side of steam generator 2.

[0072] 243) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0073] 25) Steam quality monitor 22 detected that the steam parameters were substandard, and condensate quality monitor 23 detected that the condensate parameters were substandard. The system then enters operating condition 6, specifically:

[0074] 251) The first valve group 4 is closed, the second valve group 5 is open, the fourth valve group 12 is closed, and the third valve group 10 is opened. The condensate is transported by the condensate pump 9 to the water treatment device 11 for treatment and then returned to the condenser 8 to form a circulation loop.

[0075] 252) Reactor 1 operates at reduced power, turbine 6 and generator set 7 are shut down until steam quality monitor 22 and condensate quality monitor 23 show normal readings. Then, the first valve group 4 is opened, turbine 6 is started, and generator set 7 is loaded. The second valve group 5 and the third valve group 10 are gradually closed.

[0076] 253) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0077] 26) When the steam quality monitor 22, condensate quality monitor 23, and feedwater quality monitor 24 all detect that the steam and water quality are all substandard, the system enters operating condition 7, specifically:

[0078] 261) The first valve group 4, the fourth valve group 12, the sixth valve group 18 and the seventh valve group 21 are all closed;

[0079] 262) The clean water tank transfer pump 20 is started to transport the feedwater in the clean water tank 19 to the secondary side of the steam generator 2. The steam turbine 6 and generator set 7 are shut down. The reactor 1 reduces its power until it is shut down. Then the clean water tank transfer pump 20 is shut down and the second valve group 5 is closed.

[0080] 263) Open the third valve group 10 and the fifth valve group 15, start the sewage tank transfer pump 17, and use the condensate pump 9, the feed water pump 14 and the sewage tank transfer pump 17 to transport the condensate and feed water to the water treatment device 11 for purification treatment.

[0081] 264) After the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 all show normal readings, close the third valve group 10 and the fifth valve group 15, and stop the sewage tank transfer pump 17.

[0082] 265) Open the first valve group 4, the fourth valve group 12, the sixth valve group 18 and the seventh valve group 21, the reactor 1 starts up and is boosted to the preset power. Steam is generated at the secondary side outlet of the steam generator 2. The steam enters the steam turbine 6 through the first valve group 4, which drives the steam turbine 6 to do work and the generator set 7 to generate electricity. The unit enters the load operation stage.

[0083] Example 1

[0084] This embodiment takes a high-temperature gas-cooled reactor nuclear power unit as an example. The steam generator 2 of the high-temperature gas-cooled reactor nuclear power unit is a vertical, DC helical tube assembly structure. Each 200MW high-temperature gas-cooled reactor nuclear power unit has two steam generators 2. The tube bundle of the steam generator 2 contains a secondary loop steam-water mixture, and the outer shell side contains helium from the primary loop of reactor 1. The steam-water quality standards during unit operation are shown in Tables 2, 3 and 4 below.

[0085] Table 2

[0086]

[0087]

[0088] Table 3

[0089]

[0090] Table 4

[0091]

[0092] 1) The quality of the soft drink is normal.

[0093] System initial state: Reactor 1, turbine 6 and generator set 7 are not running, sewage tank transfer pump 17 and clean water tank transfer pump 20 are stopped, main helium blower 3 and condensate pump 9 are running, first valve group 4, fourth valve group 12 and seventh valve group 21 are open, second valve group, third valve group 10 and fifth valve group 15 are closed, and sixth valve group 18 is put into automatic mode.

[0094] 11) When reactor 1 starts up normally, the cold helium gas delivered by the main helium blower 3 is delivered to the core of reactor 1 to absorb heat and become hot helium gas. The hot helium gas enters the shell side of steam generator 2 and exchanges heat with the feedwater on the tube side to become cold helium gas. The cold helium gas continues to be delivered to the core of reactor 1 to absorb heat, so as to form the reactor 1 circulation loop.

[0095] 12) When reactor 1 is boosted to 18% of rated power, steam is generated at the secondary side outlet of steam generator 2. The steam enters steam turbine 6 through the first valve group 4, driving steam turbine 6 to do work and generator set 7 to generate electricity. After steam turbine 6 does work, the exhaust steam enters condenser 8 and is condensed. The condensate is transported to deaerator 13 by condensate pump 9, and then to secondary side of steam generator 2 by feedwater pump 14. After absorbing the heat of hot helium in steam generator 2, steam is generated and continues to enter steam turbine 6 to do work, forming secondary side circulation loop of steam generator 2.

[0096] 13) The steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 monitor the steam and water quality of the unit in real time online. During the operation of the unit, the steam and water quality meets the operating value requirements in Table 3. Reactor 1 is running at full power and generator set 7 is running at full load.

[0097] 2) Initial state of the steam and water quality abnormality system: Reactor 1, steam turbine 6 and generator set 7 are operating normally, sewage tank transfer pump 17 and clean water tank transfer pump 20 are stopped, main helium blower 3, condensate pump 9 and condensate pump are running, first valve group 4, fourth valve group 12 and seventh valve group 21 are open, second valve group 5, third valve group 10 and fifth valve group 15 are closed, and sixth valve group 18 is put into automatic mode.

[0098] 21) The water quality monitor detects water quality online in real time. When any of the following indicators reaches the alarm value: hydrogen conductivity (25℃) > 0.10 μS / cm, dissolved oxygen > 3 μg / L, hydrazine > 100 μg / L, chloride ion > 1 μg / L, sulfate ion > 1 μg / L, iron > 5 μg / L, copper > 2 μg / L, sodium > 2 μg / L, silica (dissolved silica) > 10 μg / L, the water quality parameters are unqualified, and the system enters operating condition 2, specifically:

[0099] 211) The sixth valve group 18 and the seventh valve group 21 are quickly closed, the clean water tank delivery pump 20 is started, and the water in the clean water tank 19 is delivered to the steam generator 2 to ensure the stable water supply flow of the steam generator 2.

[0100] 212) Start the sewage tank transfer pump 17 and open the fifth valve group 15. The water output by the water pump 14 enters the sewage tank 16 through the fifth valve group 15, and is then transported by the sewage tank transfer pump 17 to the water treatment device 11 for treatment.

[0101] 213) Reactor 1 and generator set 7 operate at reduced power until the feedwater quality monitor 24 displays normal readings. Then, open valve group 21, close valve group 15, and stop the wastewater tank transfer pump 17. Feedwater is pumped to the secondary side of steam generator 2 via feedwater pump 14 to absorb heat from the primary side. Gradually stop the clean water tank transfer pump 20, open valve group 18 to activate automatic operation, and replenish the clean water tank 19 to the high level.

[0102] 214) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the steam and water quality during unit operation meet the operating value requirements in Table 4, and the power of reactor 1 and generator set 7 is increased to the initial state.

[0103] 22) The condensate quality monitor 23 monitors the condensate quality in real time. When any of the following indicators reaches the alarm value: sodium > 2 μg / L, hydrogen conductivity (25℃) > 0.10 μS / cm, iron > 5 μg / L, chloride ion > 1 μg / L, silica (dissolved silica) > 10 μg / L, the condensate parameters are unqualified, and the system enters operating condition 3, specifically:

[0104] 221) The third valve group 10 is opened and the fourth valve group 12 is closed. The condensate in the condenser 8 is transported to the water treatment device 11 by the condensate pump 9 for treatment and then returned to the condenser 8 to form a circulation loop.

[0105] 222) Reactor 1 and generator set 7 operate at reduced power until the feedwater quality monitor 24 shows normal operation. Then, open the fourth valve group 12 and close the third valve group 10. After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 all show normal operation, the steam and water quality during unit operation meet the operating value requirements in Table 4. Reactor 1 and generator set 7 then increase their power to the initial operating state.

[0106] 23) Steam quality monitor 22 detected that the steam parameters were not up to standard, and entered operating condition 4, specifically:

[0107] 231) When the steam quality monitor 22 detects that the steam parameters are not up to standard, the first valve group 4 is closed, the second valve group 5 is opened, the third valve group 10 is opened, the fifth valve group 15 is opened, the sewage tank transfer pump 17 is started, the feed water output by the feed water pump 14 is transported to the water treatment device 11 by the sewage tank transfer pump 17, and the condensate output by the condensate pump 9 is transported to the water treatment device 11, and the condensate and feed water are discharged and purified respectively.

[0108] 232) Reactor 1 operates at reduced power, generator set 7 is shut down until steam quality monitor 22 shows normal operation, then the first valve group 4 is opened, turbine 6 is started, generator set 7 is loaded, and then the second valve group 5, the third valve group 10 and the fifth valve group 15 are gradually closed.

[0109] 233) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the steam and water quality during unit operation meet the operating value requirements in Table 4, and the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0110] 24) The steam quality monitor 22 monitors steam quality online in real time. When any of the following indicators reaches the alarm value: sodium > 2 μg / L, silica (dissolved silica) > 10 μg / L, hydrogen conductivity (25℃) > 0.10 μS / cm, iron > 5 μg / L, copper > 2 μg / L, the steam parameters are unqualified. Simultaneously, the feedwater quality monitor 24 monitors feedwater quality online in real time. When any of the following indicators reaches the alarm value: dissolved oxygen > 3 μg / L, hydrazine > 100 μg / L, chloride ion > 1 μg / L, sulfate ion > 1 μg / L, iron > 5 μg / L, copper > 2 μg / L, sodium > 2 μg / L, silica (dissolved silica) > 10 μg / L, the feedwater parameters are unqualified, and the system enters operating condition 5, specifically:

[0111] 241) The first valve group 4 is closed, the second valve group 5 is open, the fifth valve group 15 is open, the seventh valve group 21 is closed, the sewage tank transfer pump 17 is started, and the feed water output by the feed water pump 14 is transported to the water treatment device 11 through the sewage tank transfer pump 17 to purify the feed water; the clean water tank transfer pump 20 is started to transport the feed water in the clean water tank 19 to the secondary side of the steam generator 2 to ensure the stable feed water flow of the steam generator 2;

[0112] 242) Reactor 1 operates at reduced power, turbine 6 and generator set 7 are shut down until steam quality monitor 22 and feedwater quality monitor 24 show normal readings. Then, the first valve group 4 is opened, turbine 6 is started, and generator set 7 is loaded. Then, the second valve group 5 and the fifth valve group 15 are gradually closed, sewage tank transfer pump 17 is shut down, the seventh valve group 21 is opened, clean water tank transfer pump 20 is shut down, and feedwater pump 14 outputs feedwater to the secondary side of steam generator 2 to continue absorbing heat from the primary side of steam generator 2.

[0113] 243) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the steam and water quality during unit operation meet the operating value requirements in Table 4, and the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0114] 25) Steam quality monitor 22 monitors steam quality online in real time. When any of the following indicators reaches the alarm value: Sodium > 2 μg / L, Silica (dissolved silica) > 10 μg / L, Hydrogen conductivity (25℃) > 0.10 μS / cm, Iron > 5 μg / L, Copper > 2 μg / L, the steam parameters are unqualified. Simultaneously, condensate quality monitor 23 monitors condensate quality online in real time. When any of the following indicators reaches the alarm value: Sodium > 2 μg / L, Hydrogen conductivity (25℃) > 0.10 μS / cm, Iron > 5 μg / L, Chloride ions > 1 μg / L, Silica (dissolved silica) > 10 μg / L, the condensate parameters are unqualified, and the system enters operating condition 6, specifically:

[0115] 251) The first valve group 4 is closed, the second valve group 5 is open, the fourth valve group 12 is closed, and the third valve group 10 is opened. The condensate is pumped by the condensate pump 9 to the water treatment device 11 for treatment and then returned to the condenser 8 to form a circulation loop.

[0116] 252) Reactor 1 operates at reduced power, turbine 6 and generator set 7 are shut down until steam quality monitor 22 and condensate quality monitor 23 show normal readings. Then, the first valve group 4 is opened, turbine 6 is started, and generator set 7 is loaded. The second valve group 5 and the third valve group 10 are gradually closed.

[0117] 253) After confirming that the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 are all normal, the steam and water quality during unit operation meet the operating value requirements in Table 4, and the reactor 1 and generator set 7 are upgraded to the initial operating state.

[0118] 26) Steam quality monitor 22 monitors steam quality online in real time. When any of the following indicators reaches the alarm value: Sodium > 2 μg / L, Silica (dissolved silica) > 10 μg / L, Hydrogen conductivity (25℃) > 0.10 μS / cm, Iron > 5 μg / L, Copper > 2 μg / L, the steam quality is considered substandard. Condensate quality monitor 23 monitors condensate quality online in real time. When any of the following indicators reaches the alarm value: Sodium > 2 μg / L, Hydrogen conductivity (25℃) > 0.10 μS / cm, Iron > 5 μg / L, Copper > 2 μg / L, the steam quality is considered substandard. Dissolved oxygen > 0.10 μS / cm, iron > 5 μg / L, chloride ion > 1 μg / L, silica (dissolved silica) > 10 μg / L; simultaneously, the feedwater quality monitor is online 24 / 7 to monitor feedwater quality. When any of the following indicators reaches the alarm value: dissolved oxygen > 3 μg / L, hydrazine > 100 μg / L, chloride ion > 1 μg / L, sulfate ion > 1 μg / L, iron > 5 μg / L, copper > 2 μg / L, sodium > 2 μg / L, silica (dissolved silica) > 10 μg / L. If the steam, condensate, and feedwater parameters are all unqualified, the system enters operating condition 7, specifically:

[0119] 261) The first valve group 4, the fourth valve group 12, the sixth valve group 18 and the seventh valve group 21 are all closed;

[0120] 262) The clean water tank transfer pump 20 is started to transfer the feedwater in the clean water tank 19 to the secondary side of the steam generator 2. The steam turbine 6 and generator set 7 are shut down. The reactor 1 reduces its power until it is shut down. Then the clean water tank transfer pump 20 is shut down and the second valve group 5 is closed.

[0121] 263) Open the third valve group 10 and the fifth valve group 15, start the sewage tank transfer pump 1, and use the condensate pump 9, the feed water pump 14 and the sewage tank transfer pump 17 to transport the condensate and feed water to the water treatment device 11 for purification treatment.

[0122] 264) When the steam quality monitor 22, condensate quality monitor 23 and feedwater quality monitor 24 all show normal readings, close the third valve group 10 and the fifth valve group 15, and stop the sewage tank transfer pump 17.

[0123] 265) Open the first valve group 4, the fourth valve group 12, the sixth valve group 18 and the seventh valve group 21; after the reactor 1 starts up and is boosted to the preset power, steam is generated at the secondary side outlet of the steam generator 2. The steam enters the steam turbine 6 through the first valve group 4, driving the steam turbine 6 to do work and the generator set 7 to generate electricity. The unit enters the load operation stage.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A steam-water quality control system for a high-temperature gas-cooled reactor steam generator, characterized in that, It includes a reactor (1), a steam generator (2), a first valve group (4), a steam turbine (6), a condenser (8), a generator set (7), a second valve group (5), a third valve group (10), a water treatment device (11), a feedwater pump (14), a fifth valve group (15), a sewage tank (16), a sixth valve group (18), a clean water tank (19), and a seventh valve group (21). The reactor (1) is connected to the primary side of the steam generator (2). The secondary side outlet of the steam generator (2) is divided into two paths. One path is connected to the inlet of the steam turbine (6) via the first valve group (4). The exhaust port of the steam turbine (6) is connected to the inlet of the condenser (8). The steam turbine (6) is connected to the generator set (7). The other path is connected to the inlet of the condenser (8) via the second valve group (5). The outlet of the condenser (8) is divided into two paths via the condensate pump (9). One path is connected to the condenser (8) via the third valve group (10) and the water treatment device (11). The inlet is connected, and the other path is connected to the inlet of the feed pump (14) via the fourth valve group (12) and the deaerator (13). The outlet of the feed pump (14) is divided into three paths. The first path is connected to the inlet of the sewage tank (16) via the fifth valve group (15), and the outlet of the sewage tank (16) is connected to the inlet of the water treatment device (11). The second path is connected to the inlet of the clean water tank (19) via the sixth valve group (18), and the third path is connected to the outlet of the clean water tank (19) via the seventh valve group (21) and then connected to the secondary side inlet of the steam generator (2) via a pipe.

2. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 1, characterized in that, The outlet of the sewage tank (16) is connected to the inlet of the water treatment device (11) via the sewage tank transfer pump (17).

3. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 2, characterized in that, It also includes a clean water tank delivery pump (20), the outlet of the clean water tank (19) is connected to the inlet of the clean water tank delivery pump (20); the third path is connected to the outlet of the clean water tank delivery pump (20) through a pipe after passing through the seventh valve group (21), and then connected to the secondary inlet of the steam generator (2).

4. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 3, characterized in that, It also includes a steam quality monitor (22), a condensate quality monitor (23) and a feedwater quality monitor (24). The steam quality monitor (22) is connected to the secondary outlet of the steam generator (2) and the pipeline between the first valve group (4) and the second valve group (5). The condensate quality monitor (23) is connected to the pipeline between the condensate pump (9) and the fourth valve group (12). The feedwater quality monitor (24) is connected to the pipeline between the feedwater pump (14) and the sixth valve group (18) and the seventh valve group (21).

5. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 4, characterized in that, When the water quality monitoring instrument (24) detects that the water quality parameters are not up to standard, the following operations shall be performed: 211) The sixth valve group (18) and the seventh valve group (21) are closed, the water tank delivery pump (20) is started, and the water in the water tank (19) is delivered to the steam generator (2) to ensure the stable water flow of the steam generator (2); 212) Start the sewage tank transfer pump (17) and open the fifth valve group (15). The water output by the water pump (14) enters the sewage tank (16) through the fifth valve group (15) and is then transported by the sewage tank transfer pump (17) to the water treatment device (11) for treatment. 213) The reactor (1) and generator set (7) operate at reduced power until the feedwater quality monitor (24) shows normal operation. Then, the seventh valve group (21) is opened, the fifth valve group (15) is closed, the sewage tank transfer pump (17) is stopped, and the feedwater is transported to the secondary side of the steam generator (2) via the feedwater pump (14) to absorb heat from the primary side. The clean water tank transfer pump (20) is gradually stopped, the sixth valve group (18) is opened, and the liquid level in the clean water tank (19) is replenished to the preset high liquid level. 214) After confirming that the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) are all normal, the reactor (1) and generator set (7) are increased to the initial state.

6. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 4, characterized in that, When the condensate quality monitor (23) detects that the condensate parameters are not up to standard, the following operations shall be performed: 221) The third valve group (10) is opened and the fourth valve group (12) is closed. The condensate in the condenser (8) is transported to the water treatment device (11) for treatment by the condensate pump (9) and then returned to the condenser (8) to form a circulation loop. 222) The reactor (1) and generator set (7) operate at reduced power until the feedwater quality monitor (24) shows normal operation. Then, the fourth valve group (12) is opened and the third valve group (10) is closed. After confirming that the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) all show normal operation, the reactor (1) and generator set (7) are powered up to the initial operating state.

7. The high-temperature gas-cooled reactor steam generator steam quality control system according to claim 4, characterized in that, When the steam quality monitor (22) detects that the steam parameters are not up to standard, the following operations are performed: 231) Close the first valve group (4), open the second valve group (5), open the third valve group (10), open the fifth valve group (15), start the sewage tank transfer pump (17), and the water output from the feed pump (14) is transported to the water treatment device (11) by the sewage tank transfer pump (17). The condensate output from the condensate pump (9) is transported to the water treatment device (11). The condensate and feed water are discharged and purified by the water treatment device (11). 232) The reactor (1) operates at reduced power and the generator set (7) is shut down until the steam quality monitor (22) shows normal operation. Then, the first valve group (4) is opened, the steam turbine (6) is started, and the generator set (7) is loaded. Then, the second valve group (5), the third valve group (10) and the fifth valve group (15) are gradually closed. 233) After confirming that the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) are all normal, the reactor (1) and generator set (7) are upgraded to the initial operating state.

8. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 4, characterized in that, When the steam quality monitor (22) detects that the steam parameters are substandard, and the feedwater quality monitor (24) detects that the feedwater parameters are substandard, the following operations shall be performed: 241) The first valve group (4) is closed, the second valve group (5) is opened, the fifth valve group (15) is opened, the seventh valve group (21) is closed, the sewage tank transfer pump (17) is started, and the feed water output by the feed water pump (14) is transported to the water treatment device (11) through the sewage tank transfer pump (17). The feed water is then discharged and purified by the water treatment device (11). The clean water tank transfer pump (20) is started, and the feed water in the clean water tank (19) is transported to the secondary side of the steam generator (2) to ensure the stable feed water flow of the steam generator (2). 242) The reactor (1) operates at reduced power, the turbine (6) and generator set (7) are shut down until the steam quality monitor (22) and feedwater quality monitor (24) show normal operation. Then, the first valve group (4) is opened, the turbine (6) is started, and the generator set (7) is loaded. Then, the second valve group (5) and the fifth valve group (15) are gradually closed, the sewage tank transfer pump (17) is shut down, the seventh valve group (21) is opened, the clean water tank transfer pump (20) is shut down, and the feedwater output by the feedwater pump (14) is delivered to the secondary side of the steam generator (2) to continue absorbing the heat from the primary side of the steam generator (2). 243) After confirming that the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) are all normal, the reactor (1) and generator set (7) are upgraded to the initial operating state.

9. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 4, characterized in that, When the steam quality monitor (22) detects that the steam parameters are not up to standard, and the condensate quality monitor (23) detects that the condensate parameters are not up to standard, the following operations shall be performed: 251) Close the first valve group (4), open the second valve group (5), close the fourth valve group (12), open the third valve group (10), and the condensate is transported by the condensate pump (9) to the water treatment device (11) for treatment and then returned to the condenser (8) to form a circulation loop; 252) The reactor (1) operates at reduced power, the turbine (6) and generator set (7) are shut down until the steam quality monitor (22) and condensate quality monitor (23) show normal operation. Then the first valve group (4) is opened, the turbine (6) is started, and the generator set (7) is loaded. Then the second valve group (5) and the third valve group (10) are gradually closed. 253) After confirming that the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) are all normal, the reactor (1) and generator set (7) are upgraded to the initial operating state.

10. The steam-water quality control system for a high-temperature gas-cooled reactor steam generator according to claim 4, characterized in that, When the steam quality monitor (22), condensate quality monitor (23), and feedwater quality monitor (24) all detect that the steam and water quality are unqualified, the following operations shall be performed in sequence: 261) The first valve group (4), the fourth valve group (12), the sixth valve group (18) and the seventh valve group (21) are all closed; 262) Start the clean water tank transfer pump (20) to transfer the feed water in the clean water tank (19) to the secondary side of the steam generator (2), shut down the steam turbine (6) and generator set (7), reduce the power of the reactor (1) until it shuts down, then shut down the clean water tank transfer pump (20) and close the second valve group (5). 263) Open the third valve group (10) and the fifth valve group (15), start the sewage tank transfer pump (17), and use the condensate pump (9), the feed water pump (14) and the sewage tank transfer pump (17) to transport the condensate and feed water to the water treatment device (11) for purification treatment. 264) When the steam quality monitor (22), condensate quality monitor (23) and feedwater quality monitor (24) all show normal operation, close the third valve group (10) and the fifth valve group (15) and stop the sewage tank transfer pump (17). 265) Open the first valve group (4), the fourth valve group (12), the sixth valve group (18) and the seventh valve group (21), the reactor (1) starts up and is boosted to the preset power. Steam is generated at the secondary side outlet of the steam generator (2). The steam enters the steam turbine (6) through the first valve group (4), which drives the steam turbine (6) to do work and the generator set (7) to generate electricity. The unit enters the load operation stage.

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