CN110118346A - System and method for nuclear power starting electric boiler hot standby - Google Patents
System and method for nuclear power starting electric boiler hot standby Download PDFInfo
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- CN110118346A CN110118346A CN201910497347.4A CN201910497347A CN110118346A CN 110118346 A CN110118346 A CN 110118346A CN 201910497347 A CN201910497347 A CN 201910497347A CN 110118346 A CN110118346 A CN 110118346A
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- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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Abstract
The invention discloses a system and a method for heat standby of a nuclear power starting electric boiler. The invention comprises the following steps: in the starting stage of the nuclear power unit, steam generated by starting the electric boiler supplies steam to the deaerator, the unit auxiliary steam system and the shaft seal system; after the normal steam source of the auxiliary steam header can supply steam to the auxiliary steam header, the output of starting the electric boiler is reduced; the shaft seal system does not need to start the electric boiler superheater and the related pipeline system after supplying steam to start the electric boiler to enter a hot standby mode, and the steam is supplied to the auxiliary steam header by the normal steam source of the auxiliary steam header, and the auxiliary steam header supplies steam to start the electric boiler deaerator, start the electric boiler superheater and start the electric boiler, so that the start of the electric boiler, the start of the electric boiler deaerator, the start of the electric boiler superheater and the related pipeline system are guaranteed to be in a hot standby state.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a system and a method for starting an electric boiler for heat standby in nuclear power.
Background
The first unit of the nuclear power plant is generally provided with a starting electric boiler, the starting electric boiler needs to be in a hot standby state after the nuclear power plant is started by the starting electric boiler, and the electric boiler needs to be started to supply steam to the nuclear power plant in the shortest possible time after the nuclear power plant trips, so that the safety of related equipment of the nuclear power plant is ensured.
The hot standby of starting electric boiler at present mainly works through the hot standby heater in electric boiler and the oxygen-eliminating device thereof, keeps electric boiler in hot state, and this kind of hot standby's system and method has following shortcoming:
1) for the first nuclear power unit, the starting electric boiler is the only external standby steam source of the nuclear power unit, and in the long-term operation process of the nuclear power unit, the starting electric boiler is always in a high-level hot standby state, and a hot standby heater of the electric boiler is always in a working state, so that the power consumption is huge and the waste is serious;
2) when the starting electric boiler is in a hot standby state, no steam flows between the starting electric boiler and an auxiliary steam header of the nuclear power unit, the hot standby state of a pipeline is poor, the steam supply speed of the starting electric boiler to the nuclear power unit in an emergency is influenced, and hidden danger is generated on the safe operation of the nuclear power unit;
3) the parameters of steam generation during the hot standby of the starting electric boiler are not matched with the normal operation parameters of auxiliary steam of the nuclear power unit, and after the starting electric boiler is started in an emergency, the steam parameters are required to be adjusted for a long time to meet the requirement of the steam parameters of the nuclear power unit, so that the time for starting the electric boiler to supply steam to the nuclear power unit is further increased, and potential hazards are generated on the safe operation of the nuclear power unit.
The defects of the existing system and method for starting the electric boiler heat standby of the nuclear power unit are particularly obvious for the nuclear power unit of the high-temperature gas cooled reactor.
The existing design of the inlet feed water of the high-temperature gas cooled reactor evaporator is that a steam turbine is used for extracting steam to heat in a low-pressure heater, a deaerator and a high-pressure heater, when the steam turbine trips, a feed water heating steam source is lost, if an electric boiler cannot generate steam to heat the feed water of the evaporator in a short time, the inlet feed water temperature of the evaporator is greatly reduced, and the safe operation of the evaporator is damaged or the reactor is forced to stop.
The steam supply is not available after the reactor trips in the shaft seal of the turbine of the high-temperature gas-cooled reactor nuclear power generating unit, if the electric boiler is started and the shaft seal steam cannot be provided in a short time after the reactor trips, the vacuum of the turbine condenser cannot be maintained, and a large amount of steam needs to be discharged to the condenser after the unit is shut down, so that the safety of the turbine is threatened.
Disclosure of Invention
The invention aims to provide a system and a method for starting a hot standby electric boiler for nuclear power aiming at the defects of the conventional unit system.
The invention is realized by adopting the following technical scheme:
a system for nuclear power starting electric boiler hot standby comprises a starting electric boiler, a starting electric boiler outlet valve group, a starting electric boiler superheater inlet valve group, an auxiliary steam header and a starting electric boiler deaerator inlet valve group; wherein,
the electric boiler outlet is connected with the inlet of the electric boiler outlet valve group, the outlet of the electric boiler outlet valve group is divided into three parts, the first part is connected with the inlet of the electric boiler superheater inlet valve group, the second part is connected with the first inlet of the auxiliary steam header, the third part is connected with the inlet of the electric boiler deaerator inlet valve group, and the outlet of the electric boiler deaerator inlet valve group is connected with the inlet of the electric boiler.
The invention has the further improvement that a normal heater and a hot standby heater are arranged in the starting electric boiler, the outlet valve group of the starting electric boiler comprises a stop valve and a regulating valve, the inlet valve group of the starting electric boiler superheater comprises a stop valve and a regulating valve, and the inlet valve group of the starting electric boiler deaerator comprises a stop valve and a regulating valve.
The invention has the further improvement that the invention also comprises a starting electric boiler superheater, a shaft seal system valve group, a shaft seal system and a steam trap; wherein,
the outlet of the starting electric boiler superheater inlet valve group is connected with the inlet of the starting electric boiler superheater, the outlet of the starting electric boiler superheater is divided into two streams, the first stream is connected with the inlet of the shaft seal system valve group, the second stream is connected with the inlet of the steam trap, and the outlet of the shaft seal system valve group is connected with the inlet of the shaft seal system.
The invention has the further improvement that a normal heater is arranged in the starting electric boiler superheater, and the shaft seal system valve group comprises a stop valve and a check valve.
The invention has the further improvement that the invention also comprises an auxiliary steam user, a starting electric boiler deaerator, an auxiliary steam header normal steam source and a starting electric boiler water charging system; wherein,
the export of assisting vapour header connects in the entry of assisting vapour user, and the export of the normal vapour source of assisting vapour header connects in the second entry of assisting vapour header, and the export that starts electric boiler oxygen-eliminating device entry valve group connects in the first entry that starts electric boiler oxygen-eliminating device, and the export that starts electric boiler water charging system connects in the second entry that starts electric boiler oxygen-eliminating device, and the export that starts electric boiler oxygen-eliminating device connects in the entry that starts electric boiler.
The invention is further improved in that a normal heater and a hot standby heater are arranged inside the deaerator of the starting electric boiler.
A method for starting the hot standby of an electric boiler by nuclear power is based on the system for starting the hot standby of the electric boiler by the nuclear power, and comprises the following steps:
1) at the initial cold starting stage of the starting electric boiler, water is supplied to a starting electric boiler deaerator by a starting electric boiler water charging system, a normal heater in the starting electric boiler deaerator works, the water is heated and then supplied to the starting electric boiler, steam generated by the normal heater of the starting electric boiler works is divided into three paths after pressure and flow are adjusted by a regulating valve in a starting electric boiler outlet valve group and then supplied to the starting electric boiler deaerator, an auxiliary steam header and a starting electric boiler superheater respectively, the distribution of the three paths of flow is completed by the regulating valve of a starting electric boiler superheater inlet valve group and the regulating valve of the starting electric boiler deaerator inlet valve group, the normal heater in the starting electric boiler superheater works, and the steam is further heated and supplied to a shaft seal system;
2) after the steam generated by the electric boiler is started, water in the deaerator of the electric boiler is heated by the steam generated by the electric boiler, and a normal heater of the deaerator of the electric boiler is started to stop working;
3) after the auxiliary steam header supplies steam to the auxiliary steam header from a normal steam source, the output of starting the electric boiler is reduced;
4) after the shaft seal system does not need to start the electric boiler for steam supply, the electric boiler superheater is started and the normal heater in the electric boiler is started to stop working, and the electric boiler, the electric boiler deaerator, the electric boiler superheater and the related pipeline system are started to enter a hot standby mode;
5) after the electric boiler, the electric boiler deaerator, the electric boiler superheater and related pipeline systems are started to enter a hot standby mode, steam is supplied to the auxiliary steam header from a normal steam source of the auxiliary steam header, and the auxiliary steam header supplies steam to the electric boiler deaerator, the electric boiler superheater and the electric boiler, so that the electric boiler, the electric boiler deaerator, the electric boiler superheater and the related pipeline systems are ensured to be in a hot standby state;
6) after the electric boiler, the deaerator of the electric boiler, the superheater of the electric boiler and the related pipeline system are started for standby heat, water condensed from steam in the electric boiler and the related pipeline is remained in the electric boiler, water condensed from steam in the deaerator of the electric boiler and the related pipeline is remained in the deaerator of the electric boiler, and water condensed from the superheater of the electric boiler and the related pipeline enters the steam trap;
7) in starting the electric boiler, starting the deaerator of the electric boiler, starting the superheater of the electric boiler and the heat reserve of the related pipeline system, the electric boiler does not need to be started and the heat reserve heater in the deaerator of the electric boiler does not need to work.
The invention has the following advantages:
the invention provides a system and a method for starting a hot standby of an electric boiler by nuclear power. The invention has the following obvious advantages compared with the system commonly used at present:
1) steam generated by an auxiliary steam header of the nuclear power unit flows back to the electric boiler and the deaerator of the electric boiler, the thermal state of the electric boiler and the deaerator of the electric boiler is maintained by utilizing the steam, the electric boiler and a hot standby heater of the deaerator of the electric boiler do not need to work, the hot standby electric boiler does not need to consume power for standby, and the energy-saving effect is achieved;
2) the whole pipeline from the auxiliary steam header to the electric boiler has steam and is in a flowing state, and the electric boiler and the pipeline thereof have good heat standby effect;
3) the pipeline from the electric boiler to the auxiliary steam header is connected, so that the volume of the auxiliary steam header is enlarged, the auxiliary steam header can maintain the steam supply time to be prolonged under the conditions of tripping of a nuclear power unit and the like, and the running safety of the unit is improved;
4) the parameters of the electric boiler and the auxiliary steam header are kept consistent all the time, and the electric boiler can be started to supply steam to the nuclear power unit in a shorter time under the conditions of tripping of the nuclear power unit and the like;
5) during the hot standby period, the discharged condensed water is reduced, and water and energy are saved;
6) during the hot standby period, the starting and stopping times of a feed pump, a water replenishing pump, a heater and the like of the electric boiler are reduced, the running time is reduced, the service life of the equipment is prolonged while energy is saved, and the off-line maintenance and overhaul of the equipment are facilitated.
Drawings
FIG. 1 is a block diagram of a system for hot standby of a nuclear power starting electric boiler according to the present invention.
In the figure: 1-starting an electric boiler, 2-starting an outlet valve group of the electric boiler, 3-starting an inlet valve group of an overheater of the electric boiler, 4-starting the overheater of the electric boiler, 5-a shaft seal system valve group, 6-an auxiliary steam header, 7-an auxiliary steam user, 8-a shaft seal system, 9-starting an deaerator of the electric boiler, 10-starting the inlet valve group of the deaerator of the electric boiler, 11-a normal steam source of the auxiliary steam header, 12-a steam trap and 13-starting a water charging system of the electric boiler.
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 hot standby of a nuclear power starting electric boiler provided by the invention comprises a starting electric boiler 1, a starting electric boiler outlet valve group 2, a starting electric boiler superheater inlet valve group 3, a starting electric boiler superheater 4, a shaft seal system valve group 5, an auxiliary steam header 6, an auxiliary steam user 7, a shaft seal system 8, a starting electric boiler deaerator 9, a starting electric boiler deaerator inlet valve group 10, an auxiliary steam header normal steam source 11, a steam trap 12 and a starting electric boiler water charging system 13.
The outlet of a starting electric boiler 1 is connected with the inlet of a starting electric boiler outlet valve group 2, the outlet of the starting electric boiler outlet valve group 2 is divided into three parts, the first part is connected with the inlet of a starting electric boiler superheater inlet valve group 3, the second part is connected with the first inlet of an auxiliary steam header 6, the third part is connected with the inlet of a starting electric boiler deaerator inlet valve group 10, and the outlet of the starting electric boiler deaerator inlet valve group 10 is connected with the inlet of the starting electric boiler 1; the outlet of the starting electric boiler superheater inlet valve group 3 is connected with the inlet of the starting electric boiler superheater 4, the outlet of the starting electric boiler superheater 4 is divided into two parts, the first part is connected with the inlet of the shaft seal system valve group 5, the second part is connected with the inlet of the steam trap 12, and the outlet of the shaft seal system valve group 5 is connected with the inlet of the shaft seal system 8; the export of assisting vapour header 6 connects in the entry of assisting vapour user 7, and the export of assisting the normal vapour source of vapour header 11 connects in the second entry of assisting vapour header 6, and the export that starts electric boiler oxygen-eliminating device entry valve group 10 connects in the first entry that starts electric boiler oxygen-eliminating device 9, and the export that starts electric boiler water charging system 13 connects in the second entry that starts electric boiler oxygen-eliminating device 9, and the export that starts electric boiler oxygen-eliminating device 9 connects in the entry that starts electric boiler 1.
Wherein, 1 inside normal heater and the hot standby heater of being provided with of start-up electric boiler, start-up electric boiler outlet valve group 2 includes stop valve and governing valve, starts electric boiler superheater entry valve group 3 and includes stop valve and governing valve, starts electric boiler oxygen-eliminating device entry valve group 10 and includes stop valve and governing valve. The starting electric boiler superheater 4 is internally provided with a normal heater, and the shaft seal system valve group 5 comprises a stop valve and a check valve. The starting electric boiler deaerator 9 is internally provided with a normal heater and a hot standby heater.
The invention provides a method for starting an electric boiler for hot standby by nuclear power, which comprises the following steps:
1) at the initial stage of cold start of the starting electric boiler 1, water is supplied to the starting electric boiler deaerator 9 by the starting electric boiler water charging system 13, a normal heater in the starting electric boiler deaerator 9 works, the water is heated and then supplied to the starting electric boiler 1, steam generated by the normal heater of the starting electric boiler 1 works is divided into three paths after pressure and flow are adjusted by a regulating valve in the starting electric boiler outlet valve group 2 and is respectively supplied to the starting electric boiler deaerator 9, an auxiliary steam header 6 and the starting electric boiler superheater 4, the distribution of the three paths of flow is completed by a regulating valve of the starting electric boiler superheater inlet valve group 3 and a regulating valve of the starting electric boiler deaerator inlet valve group 10, the normal heater in the starting electric boiler superheater 4 works, and the steam is further heated and supplied to the system 8;
2) after the steam generated by the electric boiler 1 is started, the water in the electric boiler deaerator 9 is heated by the steam generated by the electric boiler 1, and a normal heater of the electric boiler deaerator 9 is started to stop working;
3) after the auxiliary steam header normal steam source 11 supplies steam to the auxiliary steam header 6, the output of starting the electric boiler 1 is reduced;
4) after the shaft seal system 8 does not need to start the electric boiler 1 for steam supply, the electric boiler superheater 4 is started and normal heaters in the electric boiler 1 are started to stop working, and the electric boiler 1, the electric boiler deaerator 9, the electric boiler superheater 4 and related pipeline systems are started to enter a hot standby mode;
5) after the electric boiler 1, the deaerator 9, the superheater 4 and related pipeline systems of the electric boiler are started to enter a hot standby mode, steam is supplied to the auxiliary steam header 6 from the normal steam source 11 of the auxiliary steam header, the auxiliary steam header 6 supplies steam to the deaerator 9 of the electric boiler, the superheater 4 of the electric boiler and the electric boiler 1, the deaerator 9 of the electric boiler, the superheater 4 of the electric boiler and the related pipeline systems are ensured to be in a hot standby state;
6) after the electric boiler 1, the deaerator 9 of the electric boiler, the superheater 4 of the electric boiler and related pipeline systems are started for heat standby, water condensed from steam in the electric boiler 1 and related pipelines is remained in the electric boiler 1, water condensed from steam in the deaerator 9 of the electric boiler and related pipelines is remained in the deaerator 9 of the electric boiler, and water condensed from the superheater 4 of the electric boiler and related pipelines is introduced into the steam trap 12;
7) in the hot standby of the starting electric boiler 1, the starting electric boiler deaerator 9, the starting electric boiler superheater 4 and related pipeline systems, the hot standby heaters in the starting electric boiler 1 and the starting electric boiler deaerator 9 are not needed to work.
Claims (7)
1. A system for nuclear power starting electric boiler hot standby is characterized by comprising a starting electric boiler (1), a starting electric boiler outlet valve group (2), a starting electric boiler superheater inlet valve group (3), an auxiliary steam header (6) and a starting electric boiler deaerator inlet valve group (10); wherein,
the export of starting electric boiler (1) connects and starts electric boiler export valve group (2) entry, it divide into the triplex to start electric boiler export valve group (2) export, first share connects and starts electric boiler superheater entry valve group (3) entry, the second share connects the first entry in auxiliary steam header (6), the third share connects and starts electric boiler oxygen-eliminating device entry valve group (10) entry, the export that starts electric boiler oxygen-eliminating device entry valve group (10) connects and starts electric boiler (1) entry.
2. The system for the hot standby of the nuclear power starting electric boiler as claimed in claim 1, characterized in that a normal heater and a hot standby heater are arranged inside the starting electric boiler (1), the starting electric boiler outlet valve set (2) comprises a stop valve and a regulating valve, the starting electric boiler superheater inlet valve set (3) comprises a stop valve and a regulating valve, and the starting electric boiler deaerator inlet valve set (10) comprises a stop valve and a regulating valve.
3. The system for nuclear power starting electric boiler heat standby according to claim 1, characterized by further comprising a starting electric boiler superheater (4), a shaft seal system valve group (5), a shaft seal system (8) and a steam trap (12); wherein,
the outlet of the starting electric boiler superheater inlet valve group (3) is connected with the inlet of the starting electric boiler superheater (4), the outlet of the starting electric boiler superheater (4) is divided into two streams, the first stream is connected with the inlet of the shaft seal system valve group (5), the second stream is connected with the inlet of the steam trap (12), and the outlet of the shaft seal system valve group (5) is connected with the inlet of the shaft seal system (8).
4. The system for the heat standby of the nuclear power starting electric boiler as claimed in claim 3, characterized in that a normal heater is arranged in the starting electric boiler superheater (4), and the shaft seal system valve group (5) comprises a stop valve and a check valve.
5. The system for the hot standby of the nuclear power starting electric boiler according to claim 3, characterized by further comprising an auxiliary steam user (7), a starting electric boiler deaerator (9), an auxiliary steam header normal steam source (11) and a starting electric boiler water charging system (13); wherein,
the export of assisting vapour header (6) connects in the entry of assisting vapour user (7), the export of assisting the normal vapour source (11) of vapour header connects in the second entry of assisting vapour header (6), the export that starts electric boiler oxygen-eliminating device entry valve group (10) connects in the first entry that starts electric boiler oxygen-eliminating device (9), the export that starts electric boiler water charging system (13) connects in the second entry that starts electric boiler oxygen-eliminating device (9), the export that starts electric boiler oxygen-eliminating device (9) connects in the entry that starts electric boiler (1).
6. The system for the hot standby of the nuclear power starting electric boiler as claimed in claim 5, characterized in that a normal heater and a hot standby heater are arranged inside the deaerator (9) of the starting electric boiler.
7. A method for hot standby of a nuclear power starting electric boiler, which is based on the system for hot standby of the nuclear power starting electric boiler in claim 5, and comprises the following steps:
1) at the initial cold start stage of the starting electric boiler (1), water is supplied to the starting electric boiler deaerator (9) by the starting electric boiler water charging system (13), a normal heater in the starting electric boiler deaerator (9) works, the water is heated and then supplied to the starting electric boiler (1), and steam is generated by the normal heater of the starting electric boiler (1), the steam is divided into three paths after the pressure and the flow are adjusted by a regulating valve in a starting electric boiler outlet valve group (2), and the three paths of steam are respectively supplied to a starting electric boiler deaerator (9), an auxiliary steam header (6) and a starting electric boiler superheater (4), the distribution of the three paths of flow is completed by the regulating valve of the starting electric boiler superheater inlet valve group (3) and the regulating valve of a starting electric boiler deaerator inlet valve group (10), a normal heater in the starting electric boiler superheater (4) works, and the steam is further heated and supplied to a shaft seal system (8);
2) after the steam generated by the electric boiler (1) is started, water in the electric boiler deaerator (9) is heated by the steam generated by the electric boiler (1), and a normal heater of the electric boiler deaerator (9) is started to stop working;
3) after the normal steam source (11) of the auxiliary steam header supplies steam to the auxiliary steam header (6), the output of starting the electric boiler (1) is reduced;
4) after the shaft seal system (8) does not need to start the electric boiler (1) for steam supply, the electric boiler superheater (4) is started and normal heaters in the electric boiler (1) are started to stop working, and the electric boiler (1), the electric boiler deaerator (9), the electric boiler superheater (4) and related pipeline systems enter a hot standby mode;
5) after the electric boiler (1), the electric boiler deaerator (9), the electric boiler superheater (4) and related pipeline systems enter a hot standby mode, steam is supplied to the auxiliary steam header (6) from the auxiliary steam header normal steam source (11), the auxiliary steam header (6) supplies steam to the electric boiler deaerator (9), the electric boiler superheater (4) and the electric boiler (1), and the electric boiler deaerator (1), the electric boiler deaerator (9), the electric boiler superheater (4) and the related pipeline systems are guaranteed to be in a hot standby state;
6) after the electric boiler (1), the deaerator (9) of the electric boiler, the superheater (4) of the electric boiler and related pipeline systems are started for hot standby, water condensed from steam in the electric boiler (1) and related pipelines is remained in the electric boiler (1), water condensed from steam in the deaerator (9) of the electric boiler and related pipelines is remained in the deaerator (9) of the electric boiler, and water condensed in the superheater (4) of the electric boiler and related pipelines enters the steam trap (12);
7) in the heat standby of the starting electric boiler (1), the starting electric boiler deaerator (9), the starting electric boiler superheater (4) and related pipeline systems, the heat standby heaters in the starting electric boiler (1) and the starting electric boiler deaerator (9) are not required to work.
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| CN201910497347.4A CN110118346B (en) | 2019-06-10 | 2019-06-10 | Nuclear power starting electric boiler hot standby system and method |
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| CN113982700A (en) * | 2021-11-04 | 2022-01-28 | 华能山东石岛湾核电有限公司 | High temperature gas cooled reactor shaft seal steam supply system |
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| CN111536498A (en) * | 2020-06-11 | 2020-08-14 | 西安热工研究院有限公司 | Rapid starting control system and method for electric boiler of nuclear power plant |
| CN111536498B (en) * | 2020-06-11 | 2021-11-09 | 西安热工研究院有限公司 | Rapid starting control system and method for electric boiler of nuclear power plant |
| CN113982700A (en) * | 2021-11-04 | 2022-01-28 | 华能山东石岛湾核电有限公司 | High temperature gas cooled reactor shaft seal steam supply system |
| CN113982700B (en) * | 2021-11-04 | 2023-11-21 | 华能山东石岛湾核电有限公司 | High-temperature gas cooled reactor shaft seal steam supply system |
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