CN110131003B - System and method for starting and stopping two loops of high-temperature gas cooled reactor nuclear power unit - Google Patents

System and method for starting and stopping two loops of high-temperature gas cooled reactor nuclear power unit Download PDF

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CN110131003B
CN110131003B CN201910498205.XA CN201910498205A CN110131003B CN 110131003 B CN110131003 B CN 110131003B CN 201910498205 A CN201910498205 A CN 201910498205A CN 110131003 B CN110131003 B CN 110131003B
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valve group
steam
pressure
valve
outlet
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CN110131003A (en
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马晓珑
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Xian Thermal Power Research Institute Co Ltd
Huaneng Group Technology Innovation Center Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Huaneng Group Technology Innovation Center Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/345—Control or safety-means particular thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/44—Use of steam for feed-water heating and another purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F22D1/325—Schematic arrangements or control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Control Of Turbines (AREA)

Abstract

A system and a method for starting and stopping a secondary loop of a high-temperature gas cooled reactor nuclear power unit comprise a high-pressure cylinder, a low-pressure cylinder, sixteen groups of valve groups, a steam-water separator, an evaporator, an external steam source, a bypass regulating valve, an auxiliary steam header, a high-pressure heater, a condenser, an auxiliary steam user, a unit drainage tank, a water supply pump, a deaerator, a low-pressure heater, a condensate pump, a condensate water supplementing system and a fine treatment system. The method comprises the following main steps: 1) Supplying steam to the auxiliary steam header from an external steam source at the initial stage of starting the unit; 2) Recovering water in the steam-water separator to the deaerator; 3) Recycling bypass steam to the low-pressure heater, the auxiliary steam header and the high-pressure heater; 4) When the steam extraction pressure of the steam turbine is enough, the low-pressure heater, the auxiliary steam header and the high-pressure heater are used for extracting steam and supplying steam from the steam turbine; 5) In the stopping process of the second loop, along with the reduction of the load of the unit, when the extraction pressure of the turbine is insufficient, the front steam of the bypass regulating valve supplies steam to the low-pressure heater, the auxiliary steam header and the high-pressure heater.

Description

System and method for starting and stopping two loops of high-temperature gas cooled reactor nuclear power unit
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a system and a method for starting and stopping a secondary loop of a high-temperature gas cooled reactor nuclear power unit.
Background
At present, the inlet water of an evaporator of a high-temperature gas cooled reactor nuclear power station is heated by a low-pressure heater, a deaerator and a high-pressure heater, so that the requirement of the water temperature at the inlet of the evaporator is met, and the normal steam sources of the low-pressure heater, the deaerator and the high-pressure heater are all the extraction steam of a steam turbine; the main steam source of the auxiliary steam is steam extraction of a steam turbine, and the standby steam source is steam generated by an electric boiler; the water in the steam-water separator is drained to the condenser after the water quality is qualified.
The prior system mainly has the following defects:
1) Before the steam turbine is not loaded, the steam extraction is unavailable, the water supply of the evaporator can only supply steam to the deaerator for heating through the starting boiler, and the starting boiler needs long-time operation, and has high cost, poor heating effect and instability;
2) At the initial stage of starting, a large amount of steam is discharged to the condenser through the bypass, and the heat of the steam discharged into the condenser cannot be utilized, so that the energy is wasted;
3) The water in the steam-water separator has certain temperature and pressure after the unit is started, and after the water is discharged to the condenser, the heat of the water cannot be recovered and is wasted.
4) The steam and the hot water are discharged into the condenser, so that the temperature of the condensed water is increased, and the efficiency of the steam turbine is reduced;
5) Too high a temperature of the condensed water can affect the operation of the finishing treatment;
6) After the steam enters the condenser to become condensate, the condensate is pumped into the deaerator by the condensate pump, so that the power consumption of the condensate pump is increased;
7) When the shutdown is carried out under the working condition of no shutdown of the stack, after the steam turbine is shut down, the extraction steam is completely lost, the high-pressure heater, the low-pressure heater and the deaerator steam source are completely lost, the inlet water supply temperature of the evaporator is rapidly reduced, and the safety of the evaporator is affected;
8) When a single-reactor stop working condition is carried out, the load of the steam turbine is reduced by 50%, the extraction pressure and flow are reduced, the inlet temperature of the operating reactor is suddenly reduced, and the safety of the evaporator is affected;
9) In normal operation of the unit, the electric boiler needs to be in a hot standby state, which is energy waste;
10 Even if the electric boiler is in a hot standby state, at least 15 minutes is needed from hot standby to the condition that the auxiliary steam header can be effectively supplied with steam, and the deaerator loses heating and the shaft seal loses the steam source in the period of losing the steam source of the auxiliary steam header, so that the safe operation and further starting of the unit are influenced.
Disclosure of Invention
The invention aims to provide a system and a method for starting and stopping a secondary loop of a high-temperature gas cooled reactor nuclear power unit aiming at the defects of the conventional unit system.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a system for starting and stopping a secondary loop of a nuclear power unit of a high-temperature gas cooled reactor comprises an evaporator, a steam-water separator, a unit drainage tank, a deaerator, a condenser, a first valve group, a second valve group, a third valve group, a fourth valve group, a fifth valve group, a sixth valve group, a seventh valve group and an eighth valve group; wherein,,
the outlet of the evaporator is connected with the inlet of the first valve group, the outlet of the first valve group is divided into two strands, the first strand is connected with the inlet of the second valve group, the second strand is connected with the inlet of the third valve group, the outlet of the third valve group is connected with the inlet of the steam-water separator, the first outlet of the steam-water separator is connected with the inlet of the fourth valve group, the second outlet of the steam-water separator is connected with the inlet of the fifth valve group, the outlet of the fifth valve group is divided into three strands, the first strand is connected with the inlet of the sixth valve group, the second strand is connected with the inlet of the seventh valve group, the third strand is connected with the inlet of the eighth valve group, the outlet of the sixth valve group is connected with the inlet of the unit drainage tank, the outlet of the seventh valve group is connected with the first inlet of the condenser, and the outlet of the eighth valve group is connected with the first inlet of the deaerator.
The invention is further improved in that the first valve group, the fourth valve group and the fifth valve group are all composed of stop valves and regulating valves, and the second valve group, the third valve group, the sixth valve group, the seventh valve group and the eighth valve group are all composed of stop valves.
The invention is further improved in that the invention also comprises a high-pressure cylinder, a low-pressure cylinder, a bypass regulating valve, a high-pressure heater, an auxiliary steam header, a low-pressure heater, a ninth valve group, a tenth valve group, an eleventh valve group, a twelfth valve group, a thirteenth valve group and a fourteenth valve group; wherein,,
the outlet of the second valve group and the outlet of the fourth valve group are connected and split into two branches, the first branch is connected to the inlet of the high-pressure cylinder, the second branch is connected to the inlet of the bypass regulating valve, the pipeline is connected to the pipeline in front of the bypass regulating valve, the pipeline is respectively connected to the inlet of the ninth valve group, the twelfth valve group and the inlet of the fourteenth valve group, the first outlet of the high-pressure cylinder is connected to the inlet of the tenth valve group, the second outlet of the high-pressure cylinder is connected to the inlet of the eleventh valve group, the third outlet of the high-pressure cylinder is connected to the inlet of the low-pressure cylinder, the first outlet of the low-pressure cylinder is connected to the inlet of the thirteenth valve group, the outlet of the ninth valve group and the outlet of the tenth valve group are connected to the first inlet of the auxiliary steam header after being connected, the outlet of the fourteenth valve group and the outlet of the thirteenth valve group are connected to the first inlet of the low-pressure heater, the second outlet of the low-pressure cylinder is connected to the second inlet of the condenser, the outlet of the bypass regulating valve is connected to the third inlet of the condenser, the outlet of the low-pressure heater is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the high-pressure heater.
The invention is further improved in that the ninth valve group, tenth valve group, eleventh valve group, twelfth valve group, thirteenth valve group and fourteenth valve group are each composed of a shut-off valve, a regulating valve and a check valve.
The invention is further improved in that the invention also comprises a condensate pump, a water supply pump, an auxiliary steam user, an external steam source, a fifteenth valve group, a sixteenth valve group, a fine treatment system, a condensate water supplementing system and a seventeenth valve group; wherein,,
the condensing water system is connected to a fourth inlet of the condenser, an outlet of the condenser is connected to an inlet of the condensate pump, an outlet of the condensate pump is divided into two branches, a first branch is connected to an inlet of the sixteenth valve group, a second branch is connected to an inlet of the finishing system, an outlet of the sixteenth valve group is connected to a second inlet of the low-pressure heater after being converged with an outlet of the finishing system, a first outlet of the auxiliary steam header is connected to an inlet of the fifteenth valve group, a second outlet of the auxiliary steam header is connected to an inlet of an auxiliary steam user, an outlet of the external steam source is connected to a second inlet of the auxiliary steam header, an outlet of the fifteenth valve group is connected to a third inlet of the deaerator, an outlet of the deaerator is connected to an inlet of the feed pump, an outlet of the feed water pump is connected to an inlet of the seventeenth valve group, and an outlet of the seventeenth valve group is connected to a second inlet of the high-pressure heater.
The invention is further improved in that the auxiliary steam user comprises a user needing auxiliary steam for shaft seal, and the external steam source comprises an electric boiler and an adjacent unit, wherein the electric boiler can provide the steam source for the unit.
The invention is further improved in that the fifteenth valve group and the seventeenth valve group are both composed of stop valves and regulating valves, and the sixteenth valve group is composed of stop valves.
The method for starting and stopping the two loops of the high-temperature gas cooled reactor nuclear power unit is based on the system for starting and stopping the two loops of the high-temperature gas cooled reactor nuclear power unit, and comprises the following steps:
1) In the starting process of the secondary loop, steam is supplied to an auxiliary steam header by an external steam source, steam enters a deaerator through a fifteenth valve group to heat water, water in the deaerator enters an evaporator through a water supply pump, a seventeenth valve group and a high-pressure heater, a second valve group is in a closed state, an outlet working medium of the evaporator enters a steam-water separator through a first valve group and a third valve group, the pressure required by the evaporator is maintained by a regulating valve in the first valve group, the water level of the steam-water separator is maintained by a regulating valve in a fifth valve group, the pressure of the steam-water separator is regulated by a regulating valve in a fourth valve group, and an auxiliary steam user uses the steam of the auxiliary steam header;
2) Before the quality of the hydrophobic water in the steam-water separator does not reach the recovery standard, the water in the steam-water separator is discharged to a unit drainage tank through a fifth valve group and a sixth valve group;
3) After the water quality in the steam-water separator reaches the recovery standard and before the pressure in the steam-water separator is not higher than the pressure of the deaerator, the water in the steam-water separator is discharged to the condenser through a fifth valve group and a seventh valve group;
4) After the quality of the hydrophobic water in the steam-water separator reaches the recovery standard and the pressure in the steam-water separator is higher than the pressure of the deaerator, the hydrophobic water in the steam-water separator is discharged to the deaerator through a fifth valve group and an eighth valve group;
5) Steam in the steam-water separator enters the condenser through a fourth valve group and a bypass regulating valve, and the pressure in front of the bypass regulating valve is controlled by the bypass regulating valve;
6) When the pressure in front of the bypass regulating valve is higher than the steam side pressure of the low-pressure heater, a stop door in a fourteenth valve group is opened, and the regulating door is used for regulating the steam quantity entering the low-pressure heater from the stop door, so that the outlet water temperature of the low-pressure heater is controlled;
7) When the pressure in front of the bypass regulating valve is higher than the pressure of the deaerator, opening a stop door in a twelfth valve group, regulating the steam quantity entering the deaerator by using the regulating door, and reducing the steam supply of an external steam source until the external steam source is completely cut off;
8) When the pressure in front of the bypass regulating valve is higher than the steam side pressure of the high-pressure heater, a stop door in the ninth valve group is opened, and the regulating door is used for regulating the steam quantity entering the high-pressure heater from the stop door, so that the outlet water temperature of the high-pressure heater is controlled;
9) When the steam parameters in front of the high-pressure cylinder meet the steam turbine flushing requirements, the steam turbine flushing is carried out, and in the flushing process, the steam quantity required by the steam turbine flushing and on-load is regulated through a bypass regulating valve;
10 After the steam turbine is loaded, after the extraction pressure of the low-pressure cylinder reaches the pressure that extraction can be normally put into, all valves in the fourteenth valve group are closed, stop valves in the thirteenth valve group are opened, the steam quantity entering the low-pressure heater is regulated by regulating valves in the thirteenth valve group, and the temperature of outlet water of the low-pressure heater is further controlled;
11 After the steam turbine is loaded, after the 1-section steam extraction pressure of the high-pressure cylinder reaches the pressure that the steam extraction can be normally put into, all valves in a ninth valve group are closed, a stop valve in a tenth valve group is opened, the steam quantity entering the high-pressure heater is regulated by a regulating valve in the tenth valve group, and the temperature of outlet water of the high-pressure heater is further controlled;
12 After the steam turbine is loaded, after the 2-section steam extraction pressure of the high-pressure cylinder reaches the pressure that the steam extraction can be normally put into, all valves in the twelfth valve group are closed, the stop valve in the eleventh valve group is opened, the steam quantity entering the auxiliary steam header is regulated by the regulating valve in the eleventh valve group, and the pressure of the auxiliary steam header is further controlled;
13 When all the working media at the outlet of the evaporator are steam and the superheat degree is higher than a set value, opening the second valve group, closing the third valve group, and completing the starting of the two loops;
14 During the stopping process of the second loop, as the load of the unit is reduced, after the superheat degree of the steam at the outlet of the evaporator is lower than a set value, opening a stop gate in a fourth valve group, gradually opening an adjusting gate in the fourth valve group, after the front pressure and the rear pressure of the fourth valve group are balanced, opening a third valve group, adjusting the pressure of a steam-water separator by using the adjusting gate in the fourth valve group, closing a second valve group, adjusting the water level in the steam-water separator by using an adjusting valve in a fifth valve group, and enabling water in the steam-water separator to enter the deaerator through the fifth valve group and an eighth valve group;
15 During the stopping process of the second loop, when the extraction pressure of the low-pressure cylinder is lower than the rated pressure of the steam side of the low-pressure heater, all valves in the thirteenth valve group are closed, the stop valve in the fourteenth valve group is opened, the steam quantity entering the low-pressure heater is regulated by the regulating valve in the fourteenth valve group, and the temperature of the outlet water of the low-pressure heater is further controlled;
16 During the stopping process of the second loop, when the 1-section steam extraction pressure of the high-pressure cylinder is smaller than the rated pressure of the steam side of the high-pressure heater, all valves in the tenth valve group are closed, the stop valve in the ninth valve group is opened, the steam quantity entering the high-pressure heater is regulated by the regulating valve in the ninth valve group, and the temperature of the outlet water of the high-pressure heater is further controlled;
17 During the stopping process of the second loop, when the 2-section steam extraction pressure of the high-pressure cylinder is smaller than the rated pressure of the auxiliary steam header along with the reduction of the load of the unit, all valves in the eleventh valve group are closed, the stop valve in the twelfth valve group is opened, the steam quantity entering the auxiliary steam header is regulated by the regulating valve in the twelfth valve group, and the pressure of the auxiliary steam header is further controlled;
18 After the turbine suddenly jumps, all valves in the tenth valve group, the eleventh valve group and the thirteenth valve group are closed, and the front pressure of the main valve is controlled by a bypass regulating valve to meet the system requirement; opening a stop valve in a fourteenth valve group, and adjusting the steam quantity entering the low-pressure heater by using a regulating valve in the fourteenth valve group to further control the temperature of water at the outlet of the low-pressure heater; opening a stop valve in the ninth valve group, and adjusting the steam quantity entering the high-pressure heater by using a regulating valve in the ninth valve group to further control the temperature of water at the outlet of the high-pressure heater; opening a stop valve in the twelfth valve group, and adjusting the steam quantity entering the auxiliary steam header by using a regulating valve in the twelfth valve group to further control the pressure of the auxiliary steam header;
19 The flow rate of the second loop is matched with the power of the reactor and is regulated by a water supply pump and a seventeenth valve group; the water level of the deaerator is controlled by a condensate pump; the water level of the condenser is controlled by a condensation water supplementing system; if the water quality of the condenser exceeds the standard, the sixteenth valve group is closed, and the water enters the two-loop system after being processed by the fine processing system to be qualified.
Compared with the prior art, the invention has the following advantages:
the invention discloses a system and a method for starting and stopping a secondary loop of a high-temperature gas cooled reactor nuclear power unit. The present invention has several distinct advantages over the systems currently in common use:
1) The separator with heat is recycled after being drained, so that the energy-saving effect is achieved;
2) The heat of partial bypass steam is directly recovered, and the energy-saving effect is achieved;
3) After the bypass steam is adopted to supply steam to the auxiliary steam header, the electric boiler can be taken out of operation, and the energy-saving effect is achieved;
4) In normal operation of the unit, the electric boiler can be switched from a hot standby state to a cold standby state, and the energy-saving effect is achieved;
5) After the steam turbine trips, the auxiliary steam header can recover steam supply in a short time, which is beneficial to the safe and stable operation of the nuclear power unit;
6) A large number of bypass steam sources are introduced, and the water supply is heated through a plurality of links, so that the water supply temperature is obviously improved, and the safe operation of the evaporator is facilitated;
7) After the steam turbine trips and Shan Dui trips, the inlet temperature of the evaporator does not fluctuate severely, and the safety of unit operation is improved.
7) The consumption of the external steam used by the unit for heating the water supply of the deaerator is reduced, and the energy-saving effect is achieved;
8) The dependence of the unit on external steam is reduced, and the safe and stable operation of the nuclear power unit is facilitated;
9) The temperature of condensed water in the starting stage is reduced, and the efficiency of the steam turbine is improved;
10 The temperature of the condensed water in the starting stage is reduced, which is beneficial to the safe operation of the fine treatment system;
11 The output of the coagulation pump is reduced, and the energy-saving effect is achieved.
Drawings
FIG. 1 is a block diagram of a system for starting and stopping a secondary loop of a high temperature gas cooled reactor nuclear power unit.
In the figure: 1-high pressure cylinder, 2-low pressure cylinder, 3-second valve group, 4-third valve group, 5-eleventh valve group, 6-twelfth valve group, 7-thirteenth valve group, 8-fourth valve group, 9-first valve group, 10-ninth valve group, 11-tenth valve group, 12-steam-water separator, 13-evaporator, 14-external steam source, 15-bypass regulating valve, 16-fifth valve group, 17-auxiliary steam header, 18-fourteenth valve group, 19-high pressure heater, 20-condenser, 21-fifteenth valve group, 22-auxiliary steam user, 23-sixth valve group, 24-seventh valve group, 25-unit drain tank, 26-eighth valve group, 27-water feed pump,
28-deaerator, 29-low pressure heater, 30-condensate pump, 31-seventeenth valve group, 32-condensate water supplementing system, 33-sixteenth valve group and 34-fine treatment system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the system for starting and stopping the secondary loop of the nuclear power unit of the high-temperature gas cooled reactor provided by the invention comprises an evaporator 13, a steam-water separator 12, a unit drainage tank 25, a deaerator 28, a condenser 20, a first valve group 9, a second valve group 3, a third valve group 4, a fourth valve group 8, a fifth valve group 16, a sixth valve group 23, a seventh valve group 24 and an eighth valve group 26.
The outlet of the evaporator 13 is connected to the inlet of the first valve group 9, the outlet of the first valve group 9 is divided into two strands, the first strand is connected to the inlet of the second valve group 3, the second strand is connected to the inlet of the third valve group 4, the outlet of the third valve group 4 is connected to the inlet of the steam-water separator 12, the first outlet of the steam-water separator 12 is connected to the inlet of the fourth valve group 8, the second outlet of the steam-water separator 12 is connected to the inlet of the fifth valve group 16, the outlet of the fifth valve group 16 is divided into three strands, the first strand is connected to the inlet of the sixth valve group 23, the second strand is connected to the inlet of the seventh valve group 24, the third strand is connected to the inlet of the eighth valve group 26, the outlet of the sixth valve group 23 is connected to the inlet of the unit drain tank 25, the outlet of the seventh valve group 24 is connected to the first inlet of the condenser 20, and the outlet of the eighth valve group 26 is connected to the first inlet of the deaerator 28.
In addition, the invention also comprises a high-pressure cylinder 1, a low-pressure cylinder 2, a bypass regulating valve 15, a high-pressure heater 19, an auxiliary steam header 17, a low-pressure heater 29, a ninth valve group 10, a tenth valve group 11, an eleventh valve group 5, a twelfth valve group 6, a thirteenth valve group 7 and a fourteenth valve group 18; the outlets of the second valve group 3 and the fourth valve group 8 are merged and then split into two branches, the first branch is connected to the inlet of the high-pressure cylinder 1, the second branch is connected to the inlet of the bypass regulating valve 15, the pipelines are connected to the pipelines in front of the bypass regulating valve 15, the first outlets of the high-pressure cylinder 1 are connected to the inlet of the tenth valve group 11, the second outlet of the high-pressure cylinder 1 is connected to the inlet of the eleventh valve group 5, the third outlet of the high-pressure cylinder 1 is connected to the inlet of the low-pressure cylinder 2, the first outlet of the low-pressure cylinder 2 is connected to the inlet of the thirteenth valve group 7, the outlets of the ninth valve group 10 and the tenth valve group 11 are merged and then connected to the first inlet of the high-pressure heater 19, the outlets of the eleventh valve group 5 and the twelfth valve group 6 are merged and then connected to the first inlet of the auxiliary steam header 17, the outlets of the fourteenth valve group 18 and the thirteenth valve group 7 are merged and then connected to the first inlet of the low-pressure heater 29, the second outlet of the low-pressure cylinder 2 is connected to the second outlet of the low-pressure cylinder 20 is connected to the inlet of the low-pressure heater 29, the second outlet of the low-pressure cylinder 2 is connected to the second outlet of the low-pressure condenser 20 is connected to the outlet of the high-pressure condenser 19, and the high-pressure condenser is connected to the outlet of the high-pressure condenser 19 is connected to the high-pressure condenser 15.
Further, the invention also comprises a condensate pump 30, a water supply pump 27, an auxiliary steam user 22, an external steam source 14, a fifteenth valve group 21, a sixteenth valve group 33, a finishing system 34, a condensate supplementing system 32 and a seventeenth valve group 31; the condensate water system 32 is connected to the fourth inlet of the condenser 20, the outlet of the condenser 20 is connected to the inlet of the condensate pump 30, the outlet of the condensate pump 30 is divided into two branches, the first branch is connected to the inlet of the sixteenth valve group 33, the second branch is connected to the inlet of the finishing system 34, the outlet of the sixteenth valve group 33 and the outlet of the finishing system 34 are combined and then connected to the second inlet of the low-pressure heater 29, the first outlet of the auxiliary steam header 17 is connected to the inlet of the fifteenth valve group 21, the second outlet of the auxiliary steam header is connected to the inlet of the auxiliary steam user 22, the outlet of the external steam source 14 is connected to the second inlet of the auxiliary steam header, the outlet of the fifteenth valve group 21 is connected to the third inlet of the deaerator 28, the outlet of the deaerator 28 is connected to the inlet of the water supply pump 27, the outlet of the water supply pump 27 is connected to the inlet of the seventeenth valve group 31, and the outlet of the seventeenth valve group 31 is connected to the second inlet of the high-pressure heater 19.
The first valve group 9, the fourth valve group 8 and the fifth valve group 16 are composed of stop valves and regulating valves, and the second valve group 3, the third valve group 4, the sixth valve group 23, the seventh valve group 24 and the eighth valve group 26 are composed of stop valves.
The ninth valve group 10, the tenth valve group 11, the eleventh valve group 5, the twelfth valve group 6, the thirteenth valve group 7 and the fourteenth valve group 18 are composed of stop valves, regulating valves and check valves.
The auxiliary steam users 22 comprise users needing auxiliary steam such as shaft seals, the external steam sources 14 comprise electric boilers, adjacent units and the like which can provide steam sources for the units, the fifteenth valve group 21 and the seventeenth valve group 31 comprise stop valves and regulating valves, and the sixteenth valve group 33 comprises stop valves.
The invention provides a method for starting and stopping a secondary loop of a high-temperature gas cooled reactor nuclear power unit, which comprises the following steps:
1) In the starting process of the secondary loop, steam is supplied to the auxiliary steam header 17 by an external steam source 14, steam enters the deaerator 28 through the fifteenth valve group 21 to heat water, water in the deaerator enters the evaporator 13 through the water supply pump 27, the seventeenth valve group 31 and the high-pressure heater 19, the second valve group 3 is in a closed state, outlet working media of the evaporator 13 enter the steam-water separator 12 through the first valve group 9 and the third valve group 4, the pressure required by the evaporator 13 is maintained by a regulating valve in the first valve group 9, the water level of the steam-water separator 12 is maintained by a regulating valve in the fifth valve group 16, the pressure of the steam-water separator 12 is regulated by a regulating valve in the fourth valve group 8, and an auxiliary steam user 22 uses the steam of the auxiliary steam header 17;
2) Before the quality of the hydrophobic water in the steam-water separator 12 does not reach the recovery standard, the water in the steam-water separator 12 is discharged to a unit drainage tank 25 through a fifth valve group 16 and a sixth valve group 23;
3) After the water quality in the steam-water separator 12 reaches the recovery standard and before the pressure in the steam-water separator 12 is not higher than the pressure of the deaerator 28, the water in the steam-water separator 12 is discharged to the condenser 20 through the fifth valve group 16 and the seventh valve group 24;
4) After the quality of the hydrophobic water in the steam-water separator 12 reaches the recovery standard and the pressure in the steam-water separator 12 is higher than the pressure of the deaerator 28, the hydrophobic water in the steam-water separator 2 is discharged to the deaerator 28 through the fifth valve group 16 and the eighth valve group 26;
5) Steam in the steam-water separator 12 enters the condenser 20 through the fourth valve group 8 and the bypass regulating valve 15, and the pressure before the bypass regulating valve 15 is controlled by the bypass regulating valve 15;
6) When the pressure before the bypass regulating valve 15 is higher than the vapor side pressure of the low pressure heater 29, opening a stop gate in the fourteenth valve group 18, and regulating the amount of vapor entering the low pressure heater 29 by using the regulating gate thereof, thereby controlling the outlet water temperature of the low pressure heater 29;
7) When the pressure before the bypass regulating valve 15 is higher than the pressure of the deaerator 17, opening a stop gate in the twelfth valve group 6, regulating the steam quantity entering the deaerator by using the regulating gate, and gradually reducing the steam supply of the external steam source 14 until the external steam source is completely cut off;
8) When the pressure before the bypass regulating valve 15 is higher than the steam side pressure of the high-pressure heater 19, opening a stop gate in the ninth valve group 10, and regulating the steam amount entering the high-pressure heater 19 by using the regulating gate, thereby controlling the outlet water temperature of the high-pressure heater 19;
9) When the steam parameters in front of the high-pressure cylinder 1 meet the turbine flushing requirements, the turbine is flushed, and in the flushing process, the steam quantity required by the turbine flushing and on-load is adjusted through the bypass regulating valve 15;
10 After the steam turbine is loaded, after the extraction pressure of the low-pressure cylinder 2 is close to the rated pressure of the steam side of the low-pressure heater 29, all valves in the fourteenth valve group 18 are closed, the stop valve in the thirteenth valve group 7 is opened, the steam quantity entering the low-pressure heater 29 is regulated by the regulating valve in the thirteenth valve group 7, and the temperature of the outlet water of the low-pressure heater 29 is further controlled;
11 After the steam turbine is loaded, after the 1-section steam extraction pressure of the high-pressure cylinder 1 is close to the rated pressure of the steam side of the high-pressure heater 19, all valves in the ninth valve group 10 are closed, the stop valve in the tenth valve group 11 is opened, the steam quantity entering the high-pressure heater 19 is regulated by the regulating valve in the tenth valve group 11, and the temperature of water at the outlet of the high-pressure heater 19 is further controlled;
12 After the steam turbine is loaded, after the 2-section extraction pressure of the high-pressure cylinder 1 is close to the rated pressure of the auxiliary steam header 17, all valves in the twelfth valve group 6 are closed, the stop valve in the eleventh valve group 5 is opened, the regulating valve in the eleventh valve group 5 is used for regulating the steam quantity entering the auxiliary steam header 17, and the pressure of the auxiliary steam header 17 is further controlled;
13 When all the working media at the outlet of the evaporator 13 are steam and the superheat degree is higher than a set value, the second valve group 3 is opened, the third valve group 4 is closed, and the starting of the two loops is completed;
14 During the stopping process of the second loop, as the load of the unit is reduced, after the superheat degree of the steam at the outlet of the evaporator 13 is lower than a set value, opening a stop door in the fourth valve group 8, gradually opening a regulating door in the fourth valve group 8, after the front pressure and the rear pressure of the fourth valve group 8 are balanced, opening the third valve group 4, regulating the pressure of the steam-water separator 12 by using the regulating door in the fourth valve group 8, closing the second valve group 3, regulating the water level in the steam-water separator 12 by using a regulating valve in the fifth valve group 16, and enabling water in the steam-water separator 12 to enter the deaerator 28 through the fifth valve group 16 and the eighth valve group 26;
15 During the stopping process of the second loop, when the extraction pressure of the low-pressure cylinder 2 is lower than the rated pressure of the steam side of the low-pressure heater 29 along with the reduction of the load of the unit, all valves in the thirteenth valve group 7 are closed, the stop valve in the fourteenth valve group 18 is opened, the steam quantity entering the low-pressure heater 29 is regulated by the regulating valve in the fourteenth valve group 18, and the temperature of the water at the outlet of the low-pressure heater 29 is further controlled;
16 During the stopping process of the second loop, when the 1-section steam extraction pressure of the high-pressure cylinder 1 is smaller than the rated pressure of the steam side of the high-pressure heater 19 along with the reduction of the load of the unit, all valves in the tenth valve group 11 are closed, the stop valve in the ninth valve group 10 is opened, the steam quantity entering the high-pressure heater 19 is regulated by the regulating valve in the ninth valve group 10, and the temperature of water at the outlet of the high-pressure heater 19 is further controlled;
17 During the stopping process of the second loop, when the 2-section extraction pressure of the high-pressure cylinder 1 is lower than the rated pressure of the auxiliary steam header 17 along with the reduction of the load of the unit, all valves in the eleventh valve group 5 are closed, the stop valve in the twelfth valve group 6 is opened, the regulating valve in the twelfth valve group 6 is used for regulating the steam quantity entering the auxiliary steam header 17, and the pressure of the auxiliary steam header 17 is further controlled;
18 After the turbine suddenly jumps, all valves in the tenth valve group 11, the eleventh valve group 5 and the thirteenth valve group 7 are quickly closed, and the front pressure of the main valve is controlled by the bypass regulating valve 15 so as to meet the system requirement; opening a stop valve in the fourteenth valve group 18, and adjusting the steam amount entering the low-pressure heater 29 by using a regulating valve in the fourteenth valve group 18 to further control the temperature of water at the outlet of the low-pressure heater 29; opening a stop valve in the ninth valve group 10, and adjusting the steam amount entering the high-pressure heater 19 by using a regulating valve in the ninth valve group 10 to further control the temperature of water at the outlet of the high-pressure heater 19; opening a stop valve in the twelfth valve group 6, and adjusting the steam quantity entering the auxiliary steam header 17 by using a regulating valve in the twelfth valve group 6 to further control the pressure of the auxiliary steam header 17;
19 Second loop flow is matched with reactor power and is regulated by a feed pump 27 and a seventeenth valve group 31; the water level of the deaerator 29 is controlled by a condensate pump 30; the water level of the condenser 20 is controlled by a condensate water system 32; if the water quality of the condenser 20 exceeds the standard, the sixteenth valve group 33 is closed, and the water is processed by the fine processing system 34 to be qualified and then enters the two-loop system.

Claims (5)

1. The system for starting and stopping the second loop of the high-temperature gas cooled reactor nuclear power unit is characterized by comprising an evaporator (13), a steam-water separator (12), a unit drainage tank (25), a deaerator (28), a condenser (20), a first valve group (9), a second valve group (3), a third valve group (4), a fourth valve group (8), a fifth valve group (16), a sixth valve group (23), a seventh valve group (24), an eighth valve group (26), a high-pressure cylinder (1), a low-pressure cylinder (2), a bypass regulating valve (15), a high-pressure heater (19), an auxiliary steam header (17), a low-pressure heater (29), a ninth valve group (10), a tenth valve group (11), an eleventh valve group (5), a twelfth valve group (6), a thirteenth valve group (7), a fourteenth valve group (18), a condensate pump (30), a pump (27), an auxiliary steam user (22), an external steam source (14), a fifteenth valve group (21), a sixteenth valve group (33), a refined treatment system (34), a water supplementing system (32) and a seventeenth valve group (31); wherein,,
the outlet of the evaporator (13) is connected with the inlet of the first valve group (9), the outlet of the first valve group (9) is divided into two strands, the first strand is connected with the inlet of the second valve group (3), the second strand is connected with the inlet of the third valve group (4), the outlet of the third valve group (4) is connected with the inlet of the steam-water separator (12), the first outlet of the steam-water separator (12) is connected with the inlet of the fourth valve group (8), the second outlet of the steam-water separator (12) is connected with the inlet of the fifth valve group (16), the outlet of the fifth valve group (16) is divided into three strands, the first strand is connected with the inlet of the sixth valve group (23), the second strand is connected with the inlet of the seventh valve group (24), the third strand is connected with the inlet of the eighth valve group (26), the outlet of the sixth valve group (23) is connected with the inlet of the unit drainage tank (25), the outlet of the seventh valve group (24) is connected with the first inlet of the condenser (20), and the outlet of the eighth valve group (26) is connected with the inlet of the first condenser (28);
the first valve group (9), the fourth valve group (8) and the fifth valve group (16) are composed of stop valves and regulating valves, and the second valve group (3), the third valve group (4), the sixth valve group (23), the seventh valve group (24) and the eighth valve group (26) are composed of stop valves;
the outlet of the second valve group (3) and the outlet of the fourth valve group (8) are divided into two branches after being converged, the first branch is connected to the inlet of the high-pressure cylinder (1), the second branch is connected to the inlet of the bypass regulating valve (15), the pipeline is connected to the pipeline in front of the bypass regulating valve (15), the pipeline is respectively connected to the inlet of the ninth valve group (10), the twelfth valve group (6) and the inlet of the fourteenth valve group (18), the first outlet of the high-pressure cylinder (1) is connected to the inlet of the tenth valve group (11), the second outlet of the high-pressure cylinder (1) is connected to the inlet of the eleventh valve group (5), the third outlet of the high-pressure cylinder (1) is connected to the inlet of the low-pressure cylinder (2), the first outlet of the low-pressure cylinder (2) is connected to the inlet of the thirteenth valve group (7), the outlet of the ninth valve group (10) and the outlet of the tenth valve group (11) are converged and then connected to the first inlet of the high-pressure heater (19), the outlet of the eleventh valve group (5) and the outlet of the auxiliary valve group (6) are converged and then connected to the inlet of the first header (17) and the thirteenth valve group (20) is connected to the inlet of the low-pressure condenser (20), the outlet of the low-pressure cylinder (2) is connected to the inlet of the thirteenth valve (7), the outlet of the low-pressure heater (29) is connected to the second inlet of the deaerator (28), and the outlet of the high-pressure heater (19) is connected to the inlet of the evaporator (13);
the condensate water system (32) is connected to a fourth inlet of the condenser (20), an outlet of the condenser (20) is connected to an inlet of the condensate water pump (30), an outlet of the condensate water pump (30) is divided into two branches, a first branch is connected to an inlet of the sixteenth valve group (33), a second branch is connected to an inlet of the finishing system (34), an outlet of the sixteenth valve group (33) and an outlet of the finishing system (34) are combined and then connected to a second inlet of the low-pressure heater (29), a first outlet of the auxiliary steam header (17) is connected to an inlet of the fifteenth valve group (21), a second outlet of the auxiliary steam header is connected to an inlet of the auxiliary steam user (22), an outlet of the external steam source (14) is connected to a second inlet of the auxiliary steam header, an outlet of the fifteenth valve group (21) is connected to a third inlet of the deaerator (28), an outlet of the deaerator (28) is connected to an inlet of the pump (27), an outlet of the water supply pump (27) is connected to an inlet of the seventeenth valve group (31), and an outlet of the seventeenth valve group (31) is connected to an inlet of the high-pressure heater (19).
2. The system for starting and stopping the secondary circuit of the high-temperature gas cooled reactor nuclear power unit according to claim 1, wherein the ninth valve group (10), the tenth valve group (11), the eleventh valve group (5), the twelfth valve group (6), the thirteenth valve group (7) and the fourteenth valve group (18) are composed of a stop valve, a regulating valve and a check valve.
3. A system for start-stop of a two-circuit of a high temperature gas cooled reactor nuclear power unit as in claim 1 wherein the auxiliary steam user (22) comprises a user requiring auxiliary steam for shaft seals and the external steam source (14) comprises an electric boiler and adjacent units which can provide a source of steam for the units.
4. The system for starting and stopping a secondary circuit of a nuclear power unit of a high-temperature gas cooled reactor according to claim 1, wherein the fifteenth valve group (21) and the seventeenth valve group (31) are composed of stop valves and regulating valves, and the sixteenth valve group (33) is composed of stop valves.
5. The method for starting and stopping the secondary loop of the high-temperature gas cooled reactor nuclear power unit is characterized by comprising the following steps of:
1) in the process of starting a secondary loop, an external steam source (14) supplies steam to an auxiliary steam header (17), steam enters a deaerator (28) through a fifteenth valve group (21) to heat water, water in the deaerator enters an evaporator (13) through a water supply pump (27), a seventeenth valve group (31) and a high-pressure heater (19), a second valve group (3) is in a closed state, an outlet working medium of the evaporator (13) enters the steam-water separator (12) through a first valve group (9) and a third valve group (4), the pressure required by the evaporator (13) is maintained by a regulating valve in the first valve group (9), the water level of the steam-water separator (12) is maintained by a regulating valve in a fifth valve group (16), the pressure of the steam-water separator (12) is regulated by a regulating valve in a fourth valve group (8), and an auxiliary steam user (22) uses the steam of the auxiliary steam header (17);
2) Before the quality of the hydrophobic water in the steam-water separator (12) does not reach the recovery standard, the water in the steam-water separator (12) is discharged to a unit drainage tank (25) through a fifth valve group (16) and a sixth valve group (23);
3) After the water quality in the steam-water separator (12) reaches the recovery standard and before the pressure in the steam-water separator (12) is not higher than the pressure of the deaerator (28), the water in the steam-water separator (12) is discharged to the condenser (20) through the fifth valve group (16) and the seventh valve group (24);
4) After the quality of the hydrophobic water in the steam-water separator (12) reaches the recovery standard and the pressure in the steam-water separator (12) is higher than the pressure of the deaerator (28), the hydrophobic water in the steam-water separator (12) is discharged to the deaerator (28) through a fifth valve group (16) and an eighth valve group (26);
5) Steam in the steam-water separator (12) enters the condenser (20) through the fourth valve group (8) and the bypass regulating valve (15), and the pressure before the bypass regulating valve (15) is controlled by the bypass regulating valve (15);
6) When the pressure before the bypass regulating valve (15) is higher than the steam side pressure of the low-pressure heater (29), opening a stop gate in the fourteenth valve group (18), and regulating the steam quantity entering the low-pressure heater (29) by using the regulating gate, thereby controlling the outlet water temperature of the low-pressure heater (29);
7) When the pressure in front of the bypass regulating valve (15) is higher than the pressure of the deaerator (28), opening a stop gate in the twelfth valve group (6), regulating the steam quantity entering the deaerator by using the regulating gate, and reducing the steam supply of the external steam source (14) until the external steam source is completely cut off;
8) When the pressure before the bypass regulating valve (15) is higher than the steam side pressure of the high-pressure heater (19), opening a stop gate in the ninth valve group (10), and regulating the steam quantity entering the high-pressure heater (19) by using the regulating gate, thereby controlling the outlet water temperature of the high-pressure heater (19);
9) When the steam parameters in front of the high-pressure cylinder (1) meet the turbine flushing requirements, the turbine is flushed, and in the flushing process, the steam quantity required by the turbine flushing and on-load is adjusted through a bypass regulating valve (15);
10 After the steam turbine is loaded, when the extraction pressure of the low-pressure cylinder (2) reaches the pressure that extraction can be normally put into, all valves in a fourteenth valve group (18) are closed, stop valves in a thirteenth valve group (7) are opened, the steam quantity entering the low-pressure heater (29) is regulated by regulating valves in the thirteenth valve group (7), and the temperature of outlet water of the low-pressure heater (29) is further controlled;
11 After the steam turbine is loaded, when the 1-section steam extraction pressure of the high-pressure cylinder (1) reaches the pressure that the steam extraction can be normally put into, all valves in the ninth valve group (10) are closed, stop valves in the tenth valve group (11) are opened, the steam quantity entering the high-pressure heater (19) is regulated by regulating valves in the tenth valve group (11), and the temperature of outlet water of the high-pressure heater (19) is further controlled;
12 After the steam turbine is loaded, when the 2-section steam extraction pressure of the high-pressure cylinder (1) reaches the pressure that the steam extraction can be normally put into, all valves in the twelfth valve group (6) are closed, stop valves in the eleventh valve group (5) are opened, the steam quantity entering the auxiliary steam header (17) is regulated by regulating valves in the eleventh valve group (5), and the pressure of the auxiliary steam header (17) is further controlled;
13 When all the working media at the outlet of the evaporator (13) are steam and the superheat degree is higher than a set value, the second valve group (3) is opened, the third valve group (4) is closed, and the starting of the two loops is completed;
14 During the stopping process of the second loop, as the load of the unit is reduced, after the superheat degree of steam at the outlet of the evaporator (13) is lower than a set value, opening a stop door in the fourth valve group (8), gradually opening an adjusting door in the fourth valve group (8), after the front pressure and the rear pressure of the fourth valve group (8) are balanced, opening the third valve group (4), adjusting the pressure of the steam-water separator (12) by the adjusting door in the fourth valve group (8), closing the second valve group (3), adjusting the water level in the steam-water separator (12) by the adjusting valve in the fifth valve group (16), and enabling water in the steam-water separator (12) to enter the deaerator (28) through the fifth valve group (16) and the eighth valve group (26);
15 During the stopping process of the second loop, when the extraction pressure of the low-pressure cylinder (2) is lower than the rated pressure of the steam side of the low-pressure heater (29), all valves in the thirteenth valve group (7) are closed, the stop valve in the fourteenth valve group (18) is opened, the steam quantity entering the low-pressure heater (29) is regulated by the regulating valve in the fourteenth valve group (18), and the temperature of the water at the outlet of the low-pressure heater (29) is further controlled;
16 During the stopping process of the second loop, when the 1-section steam extraction pressure of the high-pressure cylinder (1) is smaller than the rated pressure of the steam side of the high-pressure heater (19), all valves in the tenth valve group (11) are closed, the stop valve in the ninth valve group (10) is opened, the steam quantity entering the high-pressure heater (19) is regulated by the regulating valve in the ninth valve group (10), and the temperature of outlet water of the high-pressure heater (19) is further controlled;
17 During the stopping process of the second loop, when the 2-section extraction pressure of the high-pressure cylinder (1) is lower than the rated pressure of the auxiliary steam header (17), all valves in the eleventh valve group (5) are closed, the stop valve in the twelfth valve group (6) is opened, the regulating valve in the twelfth valve group (6) is used for regulating the steam quantity entering the auxiliary steam header (17), and the pressure of the auxiliary steam header (17) is further controlled;
18 After the emergency jump of the steam turbine, all valves in a tenth valve group (11), an eleventh valve group (5) and a thirteenth valve group (7) are closed, and the front pressure of the main valve is controlled by a bypass regulating valve (15) to meet the system requirement; opening a stop valve in a fourteenth valve group (18), and adjusting the steam quantity entering the low-pressure heater (29) by using a regulating valve in the fourteenth valve group (18) to further control the temperature of outlet water of the low-pressure heater (29); opening a stop valve in the ninth valve group (10), and adjusting the steam quantity entering the high-pressure heater (19) by using a regulating valve in the ninth valve group (10) to further control the temperature of outlet water of the high-pressure heater (19); opening a stop valve in a twelfth valve group (6), and adjusting the steam quantity entering the auxiliary steam header (17) by using a regulating valve in the twelfth valve group (6) to further control the pressure of the auxiliary steam header (17);
19 The second loop flow is matched with the reactor power and is regulated by a water feed pump (27) and a seventeenth valve group (31); the water level of the deaerator (28) is controlled by a condensate pump (30); the water level of the condenser (20) is controlled by a condensation water supplementing system (32); if the water quality of the condenser (20) exceeds the standard, the sixteenth valve group (33) is closed, and the water enters the two-loop system after being qualified by the fine treatment system (34).
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