CN116398871A - Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor - Google Patents

Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor Download PDF

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Publication number
CN116398871A
CN116398871A CN202310233892.9A CN202310233892A CN116398871A CN 116398871 A CN116398871 A CN 116398871A CN 202310233892 A CN202310233892 A CN 202310233892A CN 116398871 A CN116398871 A CN 116398871A
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China
Prior art keywords
steam
pipeline
pressure
water supply
deaerator
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Pending
Application number
CN202310233892.9A
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Chinese (zh)
Inventor
王艳萍
骞宏伟
沈洵
刘洋
李彦峰
顾彧
刘杨
曹蕤
杨安霞
孟维岩
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State Nuclear Electric Power Planning Design and Research Institute Co Ltd
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State Nuclear Electric Power Planning Design and Research Institute Co Ltd
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Priority to CN202310233892.9A priority Critical patent/CN116398871A/en
Publication of CN116398871A publication Critical patent/CN116398871A/en
Pending legal-status Critical Current

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    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • 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
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention discloses a thermodynamic system and a thermodynamic method for meeting the requirement of water supply temperature of a multi-module high-temperature reactor, wherein the thermodynamic system comprises a reaction module, a steam turbine generator unit, an auxiliary steam header, a high-pressure heater, a deaerator, a gas circuit and a waterway; the gas circuit comprises a main steam pipeline, the input end of the main steam pipeline is connected with the reaction module, and the output end of the main steam pipeline is connected with the steam turbine generator unit. The deaerator inlet regulating valve and the high-pressure heater inlet regulating valve are set with different regulating values, can realize the step heating of the water supply, effectively improve the water supply temperature and meet the nuclear island requirement, are different from heating the water supply in the deaerator to 160 ℃ by a single steam source or heating the water supply of the high-pressure heater to 160 ℃ by a single steam source, have less influence on deaerator and high-pressure heater equipment bodies, and can not change the design heat exchange area and the rated design parameters of the equipment under the rated working condition.

Description

Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a thermodynamic system and a thermodynamic method for meeting the requirement of water supply temperature of a multi-module high-temperature stack.
Background
Thermal power plants generate electricity from coal and oil, hydroelectric power plants generate electricity from water power, and nuclear power plants are novel power plants that generate electric energy from energy stored inside atomic nuclei. Nuclear power plants can be largely divided into two parts: a part of the nuclear island is used for producing steam by nuclear energy and comprises a reactor device and a loop system; another part is a conventional island that uses steam to generate electricity, including a turbo generator system. The high-temperature gas cooled reactor belongs to an advanced four-generation nuclear power technology, has unique inherent safety characteristics, and is an important choice for cleaning low-carbon energy in the future whether coastal or inland.
However, in the prior art, the requirement of water supply temperature is met by only auxiliary electric boilers or adjacent machine steam heating during low load, so that the operation cost of the electric boilers is greatly increased or the power generation power of the adjacent machine is influenced. Meanwhile, in the prior art, the high-pressure heater and the reactor are in one-to-one configuration, if one high-pressure heater fails, the water supply temperature of the corresponding reactor can be reduced by about 20 ℃, and the temperature drop limit required by the nuclear island is exceeded according to the current nuclear island evaluation, so that the thermal stress of the evaporator is seriously influenced. And the start-stop system is cut off after the standby group is started, and although the energy in the process of starting the reactors can be effectively recovered, if each reactor is provided with a similar system, the multi-module unit is extremely complex and is not suitable for high-temperature gas cooled reactor units with 600MW and larger capacity. We have therefore proposed a thermodynamic system and method that meets the water temperature requirements of a multi-module thermopile in order to solve the problems set forth above.
Disclosure of Invention
The invention aims to provide a thermodynamic system and a thermodynamic method for meeting the requirement of water supply temperature of a multi-module high-temperature reactor, so as to solve the problems in the current market, which are presented by the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a thermodynamic method for meeting the requirement of water supply temperature of a multi-module high-temperature reactor sequentially comprises the following steps:
s1, starting a steam turbine generator unit through overshoot, and providing operation through an auxiliary steam header steam source when the electric load rises to 5%;
s2, switching an auxiliary steam header steam source to a main steam pipeline steam source subjected to temperature and pressure reduction during the period from 5% to 30% -40% of the electric load of the steam turbine generator unit in S1, and simultaneously switching the auxiliary steam header steam source to a deaerator and a high-pressure heater pipeline;
s3, when the electric load of the steam turbine generator unit in S2 rises from 30% -40% to the rated value, the deaerator is switched from the constant-pressure operation to the sliding-pressure operation, and meanwhile, the steam sources of the deaerator and the high-pressure heater are switched to be provided from the steam turbine generator unit;
s4, the high-pressure water heated by the deaerator is supplied to the two groups of high-pressure heaters through the water supply pump, the water treated by the high-pressure heaters returns to the main water pipeline to be supplied to the reaction module for use, and steam generated by the reaction module enters the main steam pipeline for circulation to complete closed loop.
Further, the steam source of the auxiliary steam header in the S1 is provided by an electric boiler or an adjacent pipeline.
Further, when any one of the two groups of high-voltage heaters fails, a standby bypass is started, and the standby bypass is closed after the high-voltage heaters recover to normal operation until the high-voltage heaters fail, wherein the capacity of the standby bypass is 50%.
Further, in S2, the constant value provided by the auxiliary steam header steam source to the deaerator is 0.27Mpa, and the water supply temperature at the output port of the deaerator is not lower than 130 ℃.
Further, the water temperature heated by the high-pressure heater is 160 ℃.
The invention also provides a thermodynamic system meeting the requirement of the water supply temperature of the multi-module high-temperature reactor, which comprises a reaction module, a turbo generator set, an auxiliary steam header, a high-pressure heater, a deaerator, a gas circuit and a waterway;
the gas circuit comprises a main steam pipeline, the input end of the main steam pipeline is connected with the reaction module, the output end of the main steam pipeline is connected with the steam turbine generator unit, a pressure relief pipeline is arranged on the main steam pipeline and is connected with an auxiliary steam header, a main steam temperature and pressure reducing device is arranged on the pressure relief pipeline, a steam extraction pipeline is arranged on a high-pressure cylinder of the steam turbine generator unit and is respectively connected with a high-pressure heater, a deaerator and an auxiliary steam header, an electric boiler and an adjacent machine pipeline are connected on the auxiliary steam header, two groups of output pipelines are arranged on the auxiliary steam header and are respectively connected with the high-pressure heater and the deaerator, and a pressure regulating valve is arranged on the output pipeline;
the water way comprises a water supply pipeline, the input end of the water supply pipeline is connected with a deaerator, a water supply pump is arranged on the water supply pipeline, the water supply pipeline is respectively connected with two groups of high-pressure heaters and a standby bypass, the two groups of output ends of the high-pressure heaters and the standby bypass are combined onto a main water pipeline, and the output end of the main water pipeline is connected onto a reaction module.
Further, a first isolation valve is arranged on the inlet and the outlet of the high-pressure heater and the standby bypass.
Further, the reaction modules are provided with several groups.
Further, two groups of second isolation valves are arranged at the input end of the reaction module, and regulating valves are arranged between the two groups of second isolation valves.
Further, two groups of pre-start isolation valves are arranged on the output end of the reaction module.
Compared with the prior art, the invention has the beneficial effects that:
the deaerator inlet regulating valve and the high-pressure heater inlet regulating valve are set with different regulating values, can realize the step heating of the water supply, effectively improve the water supply temperature and meet the nuclear island requirement, are different from heating the water supply in the deaerator to 160 ℃ by a single steam source or heating the water supply of the high-pressure heater to 160 ℃ by a single steam source, have less influence on deaerator and high-pressure heater equipment bodies, and can not change the design heat exchange area and the rated design parameters of the equipment under the rated working condition.
The auxiliary steam supply system can be started immediately when the island operation, namely the steam turbine generator unit is thrown to the power load of the plant, and the main steam to auxiliary steam header temperature and pressure reducing device valve is opened immediately, so that the operation safety of a water supply pump can be ensured, and the emergency shutdown of a nuclear island is prevented from being triggered.
The invention adopts double-row high-addition configuration, and the temperature of the water supply is reduced by about 10 ℃ by cutting off a single high-addition fault, thereby meeting the temperature drop limit of the nuclear island requirement.
Drawings
FIG. 1 is a schematic diagram of a thermodynamic system for meeting the water supply temperature requirements of a multi-module thermopile according to the present invention.
In the figure: 1. a main steam line; 2. a reaction module; 201. a second isolation valve; 202. a regulating valve; 203. pre-starting an isolation valve; 3. a turbo generator set; 4. a pressure relief pipeline; 401. a main steam temperature and pressure reducing device; 5. an auxiliary steam header; 501. an electric boiler; 502. a neighboring machine pipeline; 6. a steam extraction pipeline; 7. a high pressure heater; 8. a deaerator; 9. an output line; 901. a pressure regulating valve; 10. a water supply line; 1001. a water feed pump; 11. a standby bypass; 12. a main water pipe; 13. a first isolation valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a thermodynamic system meeting the requirement of water supply temperature of a multi-module high-temperature stack, which comprises a reaction module 2, a turbo generator set 3, an auxiliary steam header 5, a high-pressure heater 7, a deaerator 8, a gas circuit and a water circuit;
the gas circuit includes main steam pipeline 1, and main steam pipeline 1's input links to each other with reaction module 2, and reaction module 2 output sets up two sets of isolation valves 203 of opening in advance. The output end of the main steam pipeline 1 is connected with the steam turbine generator unit 3, a pressure relief pipeline 4 is arranged on the main steam pipeline 1, the pressure relief pipeline 4 is connected with an auxiliary steam header 5, a main steam temperature and pressure reducing device 401 is arranged on the pressure relief pipeline 4, a high-pressure cylinder on the steam turbine generator unit 3 is provided with a steam extraction pipeline 6, the steam extraction pipeline 6 is respectively connected with a high-pressure heater 7, a deaerator 8 and the auxiliary steam header 5, an electric boiler 501 and an adjacent machine pipeline 502 are connected to the auxiliary steam header 5, two groups of output pipelines 9 are arranged on the auxiliary steam header 5, the output pipelines 9 are respectively connected with the high-pressure heater 7 and the deaerator 8, and a pressure regulating valve 901 is arranged on the output pipeline 9; the turbo generator set 3 comprises a high-pressure cylinder, a low-pressure cylinder and a generator, which are sequentially connected.
The waterway comprises a water supply pipeline 10, the input end of the water supply pipeline 10 is connected with a deaerator 8, a water supply pump 1001 is arranged on the water supply pipeline 10, the water supply pipeline 10 is respectively connected with two groups of high-pressure heaters 7 and a standby bypass 11, and a first isolation valve 13 is arranged on an inlet and an outlet of each high-pressure heater 7 and the standby bypass 11. The outputs of the two sets of high-pressure heater 7 and the backup bypass 11 are combined to a main water conduit 12, the output of the main water conduit 12 being connected to the reaction module 2. The reaction modules 2 are provided with several groups. Two groups of second isolation valves 201 are arranged on the input end of the reaction module 2, and a regulating valve 202 is arranged between the two groups of second isolation valves 201.
A thermodynamic method for meeting the requirement of water supply temperature of a multi-module high-temperature reactor sequentially comprises the following steps:
s1, starting a steam turbine generator unit 3 through overshoot, and providing operation through a steam source of an auxiliary steam header 5 when the electric load rises to 5%; the steam source of the auxiliary steam header 5 is provided by an electric boiler 501 or an adjacent machine pipeline 502.
S2, switching the auxiliary steam header 5 steam source to the main steam pipeline 1 steam source subjected to temperature and pressure reduction during the period from 5% to 30% -40% of the electric load of the steam turbine generator unit 3 in S1, and simultaneously switching the auxiliary steam header 5 steam source to the pipelines of the deaerator 8 and the high-pressure heater 7; the fixed value of the auxiliary steam header 5 steam source supplied to the deaerator 8 is 0.27Mpa, and the water supply temperature of the output port of the deaerator 8 is not lower than 130 ℃. The water temperature heated by the high-pressure heater 7 was 160 ℃.
S3, when the electric load of the steam turbine generator unit 3 in S2 rises from 30% -40% to the rated value, the deaerator 8 is switched from the constant-pressure operation to the sliding-pressure operation, and meanwhile, the steam sources of the deaerator 8 and the high-pressure heater 7 are switched to be supplied from the steam turbine generator unit 3;
and S4, the high-pressure water heated by the deaerator 8 is supplied to the two groups of high-pressure heaters 7 through the water supply pump 1001, the water treated by the high-pressure heaters 7 returns to the main water pipeline 12 to be supplied to the reaction module 2 for use, and the steam generated by the reaction module 2 enters the main steam pipeline 1 for circulation to complete closed loop.
When any one of the two groups of high-pressure heaters 7 fails, the backup bypass 11 is started until the backup bypass 11 is closed after the failed high-pressure heater 7 resumes normal operation, and the capacity of the backup bypass 11 is 50%.
What is not described in detail in this specification is all that is known to those skilled in the art.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. A thermodynamic method for meeting the water supply temperature requirement of a multi-module high-temperature reactor, which is characterized in that: the method sequentially comprises the following steps:
s1, starting a steam turbine generator unit (3) through flushing, and providing operation through a steam source of an auxiliary steam header (5) when the electric load rises to 5%;
s2, switching the auxiliary steam header (5) steam source to the main steam pipeline (1) steam source subjected to temperature and pressure reduction during the period from 5% to 30% -40% of the electric load of the steam turbine generator unit (3) in S1, and simultaneously switching the auxiliary steam header (5) steam source to the deaerator (8) and the high-pressure heater (7);
s3, when the electric load of the steam turbine generator unit (3) in the S2 rises from 30% -40% to the rated value, the deaerator (8) is switched from the constant-pressure operation to the sliding-pressure operation, and meanwhile, the steam sources of the deaerator (8) and the high-pressure heater (7) are switched to be provided from the steam turbine generator unit (3);
s4, high-pressure water heated by the deaerator (8) is supplied to the two groups of high-pressure heaters (7) through the water supply pump (1001), the water processed by the high-pressure heaters (7) returns to the main water pipeline (12) to be supplied to the reaction module (2) for use, and steam generated by the reaction module (2) enters the main steam pipeline (1) to be circulated to complete closed loop.
2. A thermodynamic method for meeting the feed water temperature requirements of a multi-module thermopile according to claim 1, wherein: the steam source of the auxiliary steam header (5) in the S1 is provided by an electric boiler (501) or an adjacent machine pipeline (502).
3. A thermodynamic method for meeting the feed water temperature requirements of a multi-module thermopile according to claim 2, wherein: when any one of the two groups of high-pressure heaters (7) fails, a standby bypass (11) is started, the standby bypass (11) is closed after the high-pressure heaters (7) recover to normal operation until the failure, and the capacity of the standby bypass (11) is 50%.
4. A thermodynamic method for meeting the feed water temperature requirements of a multi-module thermopile according to claim 1, wherein: and S2, the fixed value of the steam source of the auxiliary steam header (5) provided for the deaerator (8) is 0.27Mpa, and the water supply temperature of an output port of the deaerator (8) is not lower than 130 ℃.
5. A thermodynamic method for meeting the feed water temperature requirements of a multi-module thermopile according to claim 3, wherein: the water temperature heated by the high-pressure heater (7) is 160 ℃.
6. The thermodynamic system meeting the requirement of the water supply temperature of the multi-module high-temperature reactor is characterized by comprising a reaction module (2), a steam turbine generator unit (3), an auxiliary steam header (5), a high-pressure heater (7), a deaerator (8), a gas circuit and a water circuit;
the gas circuit comprises a main steam pipeline (1), the input end of the main steam pipeline (1) is connected with a reaction module (2), the output end of the main steam pipeline (1) is connected with a steam turbine generator unit (3), a pressure relief pipeline (4) is arranged on the main steam pipeline (1), the pressure relief pipeline (4) is connected with an auxiliary steam header (5), a main steam temperature and pressure reducing device (401) is arranged on the pressure relief pipeline (4), a steam extraction pipeline (6) is arranged on a high-pressure cylinder of the steam turbine generator unit (3), the steam extraction pipeline (6) is respectively connected with a high-pressure heater (7), a deaerator (8) and the auxiliary steam header (5), an electric boiler (501) and an adjacent machine pipeline (502) are connected on the auxiliary steam header (5), two groups of output pipelines (9) are respectively connected with the high-pressure heater (7) and the deaerator (8), and the pressure regulating valve (901) is arranged on the output pipeline (901).
The water way comprises a water supply pipeline (10), the input end of the water supply pipeline (10) is connected with a deaerator (8), a water supply pump (1001) is arranged on the water supply pipeline (10), the water supply pipeline (10) is respectively connected with two groups of high-pressure heaters (7) and a standby bypass (11), the output ends of the two groups of high-pressure heaters (7) and the standby bypass (11) are combined onto a main water pipeline (12), and the output end of the main water pipeline (12) is connected onto a reaction module (2).
7. A thermodynamic system for meeting multi-module stack feedwater temperature requirements as claimed in claim 6, wherein: a first isolation valve (13) is arranged on an inlet and an outlet of the high-pressure heater (7) and the standby bypass (11).
8. A thermodynamic system for meeting multi-module stack feedwater temperature requirements as claimed in claim 6, wherein: the reaction modules (2) are provided with a plurality of groups.
9. A thermodynamic system for meeting multi-module stack feedwater temperature requirements as claimed in claim 8, wherein: two groups of second isolation valves (201) are arranged at the input end of the reaction module (2), and regulating valves (202) are arranged between the two groups of second isolation valves (201).
10. A thermodynamic system for meeting multi-module stack feedwater temperature requirements as claimed in claim 8, wherein: two groups of pre-start isolation valves (203) are arranged on the output end of the reaction module (2).
CN202310233892.9A 2023-03-03 2023-03-03 Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor Pending CN116398871A (en)

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CN202310233892.9A CN116398871A (en) 2023-03-03 2023-03-03 Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor

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Application Number Priority Date Filing Date Title
CN202310233892.9A CN116398871A (en) 2023-03-03 2023-03-03 Thermodynamic system and method for meeting water supply temperature requirements of multi-module high-temperature reactor

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