CN111121483B - Loop system for power station, flushing method of loop system and power station with loop system - Google Patents
Loop system for power station, flushing method of loop system and power station with loop system Download PDFInfo
- Publication number
- CN111121483B CN111121483B CN201911278075.5A CN201911278075A CN111121483B CN 111121483 B CN111121483 B CN 111121483B CN 201911278075 A CN201911278075 A CN 201911278075A CN 111121483 B CN111121483 B CN 111121483B
- Authority
- CN
- China
- Prior art keywords
- condenser
- water
- flow path
- water tank
- deoxygenation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
-
- 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
Abstract
The present invention relates to a circuit system for a power plant and a power plant having the same, the circuit system including: condenser, condensate pump, condensate water processing apparatus, oxygen-eliminating device liquid level regulating device, low temperature heating ware that link to each other in proper order, the oxygen-eliminating device that has the deoxidization water tank, main water feed pump, high temperature heating ware, main water feed main pipe, wherein: the loop system further comprises a first flow path and a third flow path, the first flow path is communicated with an outlet of the condensate pump and an inlet of the high-temperature heater and is provided with a first valve, the third flow path is communicated with a main water supply main pipe and the condenser and is provided with a second valve, and the first flow path and the third flow path are used for forming continuous internal circulation of the condenser, the high-temperature heater and the condenser. The invention also relates to a method for flushing the loop system for the power station.
Description
Technical Field
Embodiments of the present invention relate to the field of power generation, and in particular, to a loop system for a power plant, a method for flushing the loop system, and a power plant having the loop system.
Background
The pressurized water reactor nuclear power station transmits heat between the first loop and the second loop through the steam generator, the heat transfer pipe of the steam generator is a 690 alloy pipe with the wall thickness of about 1mm, according to the statistics of the American Electric Power Research Institute (EPRI), nearly half of the steam generators of the pressurized water reactor nuclear power station in the world are driven to operate with damaged heat transfer pipes, and more than 80% of damage causes are caused by stress corrosion. Stress corrosion cracking and intergranular corrosion which occur during the operation are directly related to the continuous concentration of impurities in water caused by the evaporation of the two loop sides, so the requirement on the water chemical environment is extremely high.
How to ensure the water quality control is one of the concerns of safe operation of a pressurized water reactor nuclear power station, which needs to be realized by a series of close matching of design, construction and installation, debugging and operation of the nuclear power station.
In the design stage, measures such as system flushing, pollution discharge, purification, chemical dosing and the like are designed through improving and analyzing the water quality standard, so that the water quality meets the design requirement of high standard; the material and installation quality of the system are comprehensively controlled in the building and security stage, and foreign matters and unqualified materials are prevented from being installed in the system; in the debugging stage, a series of temporary measures are installed, and foreign matters and impurities in the system are removed as far as possible through flushing, cold/hot flushing, purification, chemical dosing, pollution discharge and the like; in the starting stage, foreign matters and impurities in the two-loop system are removed as soon as possible by measures such as cold/hot state flushing, purification (such as putting into a fine treatment desalting system), chemical dosing and the like, so that the ion content, the oxygen content, the TDS, the TOC, the PH value and the like in water are controlled within design standards, and a good water environment is maintained.
The qualified flushing and water purification and adjustment of the secondary loop system of the nuclear power plant is an important premise for feeding water into a steam generator of a nuclear island, is a key path for debugging/starting the pressurized water reactor nuclear power plant, particularly for a unit which is put into production in large quantity or is building a third-generation nuclear power technology in China at present, the design life of the unit reaches 60 years, the requirements on foreign matters and impurities in the water environment in the secondary loop system are stricter, and the standard is higher.
Some nuclear power plants are designed based on sub-systems, a two-loop water system mainly comprises a condensate water system and a main water supply system which are closely connected in function, but the condensate water system and the main water supply system operate independently, and the condensate water system and the main water supply system are respectively flushed and purified by adopting a condensate pump and a main water supply pump, so that the large-flow closed circulation flushing and purification of the whole water system cannot be realized.
In addition, the system flushing and purification generally adopts a short-time large-flow flushing mode; namely, the condensate pump-low pressure purification, and the main water feed pump-high pressure purification is carried out after the water quality is qualified. Due to the water supply and drainage of the system, the water quantity of ten minutes of single-row flushing of a condensate pump-low pressure heater-deaerator and ten minutes of short-time single-row flushing of a main feed pump-high pressure heater-condenser can only be met.
Three rows of nuclear power units with the power of more than one million kilowatts are arranged, each row of the nuclear power units needs to take more than one day for washing, but the actual effective time is only dozens of minutes; in addition, the water capacity of the deaerator is generally 600 tons, the deaerator water tank, the three main water feeding pumps and corresponding pipelines are flushed, purified, replenished and discharged for at least three days by adopting the main water feeding pump to operate and purify at a small flow rate (the reason is that the water replenishing amount is large and the water discharge amount is large).
Even if the arrangement of the two-loop water quality adjustment work is very reasonable, the two-loop water quality adjustment work is influenced by system design, a water replenishing mode, a water discharging mode and the like, and the two-loop water quality adjustment and purification takes more than one week; the second loop of the nuclear power station has long starting water quality adjusting time, so that the whole nuclear power station has long starting time.
Disclosure of Invention
The present invention has been made to mitigate or solve at least one aspect of the technical problem in the known art.
According to an aspect of an embodiment of the present invention, there is provided a circuit system for a power plant, including: a condenser, a condensate pump, a condensate water treatment device, a deaerator liquid level regulating device, a low-temperature heater, a deaerator with a deaerating water tank, a main water feeding pump, a high-temperature heater and a main water feeding main pipe which are connected in sequence,
wherein:
the loop system further comprises a first flow path and a third flow path, the first flow path is communicated with an outlet of the condensate pump and an inlet of the high-temperature heater and is provided with a first valve, the third flow path is communicated with a main water supply main pipe and the condenser and is provided with a second valve, and the first flow path and the third flow path are used for forming continuous internal circulation of the condenser, the high-temperature heater and the condenser.
Optionally, the loop system further includes a second flow path, the second flow path communicates the deoxygenation water tank with the condenser and is provided with a third valve, and the second flow path is used for forming a continuous internal circulation of the condenser-the low-temperature heater-the deoxygenation water tank-the condenser.
The embodiment of the invention also relates to a method for flushing the loop system for the power station, wherein the loop system is the loop system, and the method for flushing comprises the following steps:
the method comprises the following steps: and pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through the first flow path, the high-temperature heater, the main water supply main pipe and the third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser.
The embodiment of the invention also relates to a method for flushing a loop system for a power station, wherein the loop system is the loop system, the loop system further comprises a condenser circulating pipeline for communicating an outlet of a condensed water pump with a condenser, and the flushing method sequentially comprises the following steps:
(1) the circulating flushing of the water in the condenser on a condensate pump is realized by utilizing a condenser circulating pipeline;
(2) pumping water from the condenser by using a condensate pump, enabling the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser;
(3) pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through a first flow path, a high-temperature heater, a main water supply main pipe and a third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser; and
(4) after the condenser is vacuumized and the deaerating water tank is heated, water in the deaerating water tank is pumped by using a main water feeding pump and enters the condenser through the high-temperature heater, the main water feeding main pipe and the third flow path.
Embodiments of the invention also relate to a power plant comprising a loop system as described above.
Drawings
FIG. 1 is a flow diagram of a nuclear power plant secondary loop system in a known design;
FIG. 2 is a flow diagram of a nuclear power plant secondary loop system in accordance with an exemplary embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
A flow chart of a known secondary loop system of a nuclear power plant is shown in fig. 1. In fig. 1, a flow of a secondary loop water system of a nuclear power plant: the method comprises the following steps of condenser-condensate pump-shaft seal heater-condensate fine treatment device-condensate pump-deaerator liquid level regulating valve-1-2 low-addition A/B/C row-3-4 low-addition A/B and bypass thereof-deaerating head-deaerating water tank-prepositive pump-main water feed pump A/B/C-6-7 high-addition A/B and bypass thereof-main water feed main pipe-steam generator A/B.
The pressurized water reactor nuclear power plant corresponding to the two-circuit system of fig. 1 can perform water quality adjustment (can be subdivided into each row of heaters and each pump) by adopting the following four processes:
the first process is as follows: the method comprises the following steps of (1) condensing a condenser, a condensate pump, a shaft seal heater, a condensate fine treatment device bypass valve, a condensate lifting pump, a condensate pump recirculation valve, a condenser water mixing and pollution discharging device and a filter screen backwashing device;
and a second process: the method comprises the following steps of (1) condensing a condenser, a condensate pump, a shaft seal heater, a condensate fine treatment device, a condensate pump, a deaerator liquid level regulating valve, 1-2 low-addition (namely low-temperature heater) A/B/C-3-4 low-addition A/B and a bypass thereof, a deaerating head, a deaerating water tank, small-circulation pollution discharge, short-time large-flow flushing for ten minutes, mixed water pollution discharge of the condenser and filter screen backwashing;
and a third process: the method comprises the following steps of (1) condensing a condenser, a condensate pump, a shaft seal heater, a condensate fine treatment device, a condensate pump, a deaerator liquid level regulating valve, 1-2 low-addition A/B/C-3-4 low-addition A/B and a bypass thereof, a deaerating head, a deaerating water tank, small-circulation gravity sewage discharge, long-circulation sewage discharge, condenser water mixing sewage discharge and filter screen backwashing; meanwhile, the preposed pump-main water feed pump A/B/C starts purification-small circulation pollution discharge and purification main water feed pump small circulation pipeline.
And (4) a fourth process: the method comprises the following steps of condenser-condensate pump-shaft seal heater-condensate fine treatment device-condensate pump-deaerator liquid level regulating valve-1-2 low-addition A/B/C-3-4 low-addition A/B-deaerating head-deaerating water tank-prepositive pump-main water supply pump A/B/C-6-7 high-addition (namely high-temperature heater) A/B and bypass thereof-main water supply main pipe-long circulating pipeline short-time large-flow flushing for ten minutes-condenser water mixing pollution discharge and filter screen backwashing.
The water quality purification and adjustment process is required to be executed once when the unit is started (including the first start of a hot trial and after overhaul) each time, and the water quality required by water supply to the nuclear island can be achieved. Qualified desalted water is used for washing a purification condenser for multiple times through a condenser water replenishing valve, a condensate pump can be started after the water quality is qualified, a purified condensate outlet is connected to a recirculation pipeline in a condensate fine treatment and condensate pump area, and then a purification unit is added to a deaerator (the purification unit can be washed by short-time large-flow direct current); after the water quality of a condensate system and a deaerator is qualified, a main water feed pump and a small-flow self-running purification deaerator can be started, and then the pipelines of the deaerator, the high heater, the long circulation and the condenser are flushed and purified by the main water feed pump in sequence (short-time large-flow flushing is adopted). All the above-mentioned works need to be accomplished in proper order, and the operation flexibility is poor, can't realize several steps and carry out simultaneously, for example the oxygen-eliminating device purifies through the little discharge operation of main feed pump, can't wash simultaneously with the low pressure heater pipeline of upper reaches and purify, just so leads to two return circuits start-up time long, generally takes about a week time. In addition, although a small circulation pipeline of the deaerator and a long circulation pipeline of a high-pressure outlet main pipe are designed in the known design, the design flow is generally small, if the small circulation of the deaerator only can realize the effect of pollution discharge, the design flow cannot be matched with the flushing flow of the low-pressure heater, and the large-flow closed circulation flushing cannot be realized. According to the relevant water washing guide rule, the water washing flow speed requirement is more than or equal to 1m/s, for example, in a million kilowatt nuclear power station, the rated main water supply flow is approximately 6800t/h, the washing flow of each row of high pressure heaters and bypass pipelines correspondingly required reaches 1700t/h to meet the washing requirement, the rated condensate flow is about 4000t/h, and the washing flow of each row of low pressure heaters and bypass pipelines correspondingly required reaches 1300t/h to meet the washing requirement.
The known design can not realize closed circulation flushing, and can only adopt the requirement of increasing the flow to 1700t/h and 1300t/h within a short time such as ten minutes to realize the short-time and pulse-type high-flow flushing flow rate. The water quality adjusting method for one-way short-time flushing has a plurality of defects in practice, which are mainly shown in the following steps:
1) it takes a long time. Because large-flow closed circulation flushing cannot be realized, only a sequential short-time and pulse type flushing method can be adopted, for example, a row of low-pressure flushing purification is adopted, the liquid level of a deaerator is firstly reduced, the flushing is stopped for ten minutes, water enters the deaerator until the water level is high, the flushing is stopped immediately, the deaerator drains water to a condenser to reduce the water level, and the flushing can be started again after the liquid level is recovered, so that the flushing speed is slow, and the effect is poor; and after three rows of low-pressure pumps and three bypasses thereof are required to finish water purification adjustment, the downstream deaerator can start to purify through a loop of a single main water feed pump (such as an A pump and B, C pumps in sequence), so that the time is long.
2) It is poor in economical efficiency. In the debugging and starting stage of the nuclear power station, particularly in the first-time second loop during the thermal test of the nuclear power station, the water quality purification and adjustment are started, generally the time is about 1 month, and a large amount of electricity, demineralized water, steam, manpower and the like are consumed. In the normal operation stage of the nuclear power station, when the unit is started after major/minor repair and temporary inspection each time, the two loops are started first to purify and adjust the water quality. Under the working condition of two-loop water quality adjustment, almost all auxiliary machines are put into operation, including preparation of chemical demineralized water, an industrial water system, a circulating water system, heating steam of a peripheral deaerator and the like, the total load of station service power per hour is more than five ten thousand kilowatt hours, nearly millions of electricity charges are needed in one day, and labor costs of operation, maintenance, analysis and chemical examination and the like are added. If the unit starting time is shortened by one day each time, millions of expenses can be saved, one day is advanced, the power generation is carried out in a grid-connected mode, and the profit of a million kilowatt-level nuclear power station is more than ten million.
3) The effective flushing time is short, and the adjusting effect is poor. The adopted mode is one-way short-time pulse type flushing, for example, a condenser-condensate pump-low-plus-A row-deaerator large-flow one-way short-time flushing is carried out for ten minutes, errors such as valve switching time, chemical sampling analysis time and the like are eliminated, the effective flushing time is short, an area which cannot be purified possibly exists in the system, and the impurities are possibly released during debugging starting and running, so that pollution discharge is increased, equipment corrosion can be caused, and the service life of the equipment is shortened.
4) The operation is complicated. Because the two-loop water system does not realize integrated overall design, the adopted large-flow one-way short-time flushing makes the operation of operators complicated and the working strength is high. Taking a condenser, a condensate pump, a low-plus-A line, a deaerator and a small-cycle flushing as an example, before an operator opens a deaerator liquid level regulating valve to flush, the liquid level of the deaerator needs to be reduced, namely, water is drained to a low liquid level, and overflow is prevented. In addition, in the washing process, because the washing time is only about ten minutes, chemical analysis is completed by chemical staff in a very short time, and because a certain distance exists between the sampling point and the chemical analysis sampling frame, the chemical analysis staff need continuously sample in ten minutes for continuous analysis, so that the risk of water quality index analysis errors exists.
5) The dosage of the desalted water is large. The high flow rate is increased and the short-time flushing is taken as the last step of two-loop water quality adjustment, the long circulating pipeline brings impurities into the condenser, and the condenser discharges through mixing water, so that the secondary pollution of the system is caused, the use amount of the demineralized water is large, and the discharged wastewater is large.
6) The requirement of washing conditions is high. The high-pressure heater is flushed at a high flow rate as the last step of flushing, the pressure of preparing to send water to a nuclear island evaporator at any time is faced, the requirement on water quality is very high, at the moment, a condenser is built, a vacuum and a deaerator is heated, an auxiliary steam system, a vacuum system, a steam turbine barring system, a circulating water system, an open water system, a closed water system and the like are required to be put into operation, the steam turbine flushing condition is basically met, the requirement condition is high, only ten minutes of flushing can be carried out each time, water quality is generally qualified only by flushing three to four times, and a large amount of operations are carried out each time when the flushing is carried out.
FIG. 2 is a flow diagram of a nuclear power plant secondary loop system in accordance with an exemplary embodiment of the present invention.
In the invention, as shown in fig. 2, a large-flow water quality adjusting pipeline (corresponding to a pipeline with the serial number of 1 in fig. 2) which is bridged from a deaerator liquid level adjusting bypass valve to a main water supply pump water outlet main pipe is designed in a loop system.
In addition, the invention adjusts the design of a small circulation flushing pipeline (corresponding to a pipeline numbered 2 in fig. 2) and a long circulation flushing pipeline (corresponding to a pipeline numbered 3 in fig. 2) in the prior art of fig. 1.
As shown in fig. 2, the loop system can realize an internal circulation loop consisting of a condensate pump, a deaerator liquid level regulating valve and a bypass thereof, a low pressure addition, a deaerator and a condenser, an internal circulation loop consisting of the condensate pump, the deaerator liquid level regulating valve and the bypass thereof, a high flow water quality regulating isolating valve (located in a pipeline 1) and the high pressure addition condenser, and the two internal circulation loops can be a high flow closed circulation flushing purification loop.
Like this, before main feed-water pump starts, can realize that the large-traffic closed circulation of whole two return water system is washed, unqualified water passes through the condenser and mixes the water discharge after the circulation, only need self-loopa purify its self pump body and connecting tube and oxygen-eliminating device water tank after main feed-water pump starts, just can continue to go the problem of washing high pressure heater and high pressure heater that adds the pipeline for a short time after purifying the oxygen-eliminating device water tank through main feed-water pump in the known design, this can shorten two whole quality of water purification adjustment times in return greatly, and effectively practice thrift two return water displacement, reach fast, economize on electricity, the target of water conservation, economic benefits is showing.
In addition to designing the condensate-main water supply cross-over pipeline (namely the pipeline 1), in the invention, compared with the known design, the pipe diameter of the small circulation pipeline (namely the pipeline 2) is changed to increase the flow capacity of the deoxygenation water tank based on gravity through the small circulation pipeline, so that circulation can be established with the condenser, for example, the low-pressure flushing large flow rate of 1300t/h can be realized, compared with the known design, the invention increases the through diameter of the small circulation pipeline, and the purpose that after the deoxygenator drains water through a small circulation cleaning valve (a valve on the pipeline 2), the gravity automatically flows into the condenser to achieve the flow capacity of 700t/h is achieved. The water discharged by the deaerator can also flow into the condenser by gravity through a pipeline 3 to reach 600t/h, and the specification of the pipeline 3 is DN 450. As can be understood by those skilled in the art, the flow capacities for realizing gravity self-circulation from the deaerating water tank to the condenser are different based on different two loops, and it is within the protection scope of the present invention as long as continuous internal circulation of the condenser-low temperature heater-deaerating water tank-condenser can be realized. Furthermore, as will be understood by those skilled in the art, it is within the scope of the present invention for the flow capacity of the conduit 3 to be as long as the requirement of continuous internal circulation of the condensate pump, high plus condenser, can be achieved, more particularly, the flow capacity of the conduit 3 is not less than 1700 t/h.
In addition, compared with the known design, the pipe diameter of the direct water feeding pipeline (the pipeline 4 in fig. 2) of the deaerator is increased to improve the water replenishing capacity of the condenser, and the continuous water replenishing capacity of the condenser is increased from 65t/h to more than or equal to 150 t/h. In addition, the direct continuous water feeding capacity of the newly added deaerator is more than or equal to 150t/h (corresponding to the pipeline 5). The pipelines 4 and 5 belong to small-caliber pipelines and can be flexibly arranged and designed according to field conditions.
Based on the technical scheme of the invention, the two-loop flushing water quality adjusting process can be effectively optimized, so that the two-loop water quality adjusting time when the nuclear power station is started is effectively shortened, and the operation difficulty is reduced.
In the invention, a condensed water-main water supply cross-over large-flow water quality purification adjusting pipeline is designed, and a low-pressure-increasing pipeline system and a high-pressure-increasing pipeline system are sequentially flushed by a condensed water pump.
In the invention, formal pipelines and equipment can be adopted to the maximum extent, and temporary pipelines and equipment are added to the minimum extent. For example, a condensate pump and a main feed pump are used as flushing pumps, and a condenser and a deaerator are used as water tanks; the design of small circulation and long circulation is optimized, and only a large-flow water quality adjusting pipe and a small amount of valves are additionally arranged.
In the invention, the flushing purification loop covers all the secondary loops of the nuclear power station, and is simple and smooth. The condensate pump can circularly wash the low-pressure addition loop and the high-pressure addition loop, the deaerator and the main water feed pump can automatically circularly wash, and all system loops can be washed and purified by matching the main water feed pump with the condensate pump. Based on the technical scheme of the invention, high-temperature high-flow short-time flushing of the high-pressure heater is cancelled or weakened, and the water mixing and pollution discharge time of the condenser is shortened in the later period under the conditions of vacuum of the condenser and heating of the deaerator.
According to the invention, the water replenishing and sewage discharging capacity of the loop system can be increased. The condenser and the deaerator are provided with water replenishing devices with increased pipe diameters and sewage pipes with increased circulating capacity, for example, the sewage circulating capacity of the condenser and the deaerator is not less than 400t/h (optionally, the range of 400 plus 700t/h), so that the water replenishing capacity of the condenser and the deaerator is improved, the water mixing and sewage discharging capacity of a water system is increased, and the water draining and changing time of the system is shortened.
In the present invention, the rinsing method is optimized. In the invention, a washing method combining open type washing discharge and closed type circulation and mainly adopting closed type large-flow circulation can be adopted to realize the condensate pump-deaerator liquid level regulating valve-low increased-flow closed type circulation washing and the condensate pump-large-flow water quality purification adjustment isolating valve-high increased-flow closed type circulation washing, thereby removing foreign matters and impurities as much as possible, simplifying the operation flow and reducing the using amount of desalted water.
In the present invention, the piping is simple. The device only relates to related pipelines and arrangement thereof, the pipelines are simple, the functions of the original system are not changed, additional equipment is not added, the investment cost is low, and the comparative benefit is very obvious.
The flushing flow of the secondary loop system of the nuclear power plant according to the invention will be described with reference to fig. 2.
Flow one (condensate recycling flushing purification): the method comprises the following steps of supplementing water to a condenser (a pipeline 4), condensing a condenser-a condensate pump-a shaft seal heater-a condensate fine treatment device-a condensate pump recirculation valve-a condenser (water mixing) blowdown-backwashing of an inlet filter screen of the condensate pump. When the system is washed, water can be replenished and drained at the same time, the drainage capacity is limited by water replenishing, the liquid level is kept in a reasonable range, the lowest liquid level can be ensured, and the pump is prevented from being damaged. The mixed water is drained from a drain valve at the bottom of the condenser when the system circulates, and is replenished by gravity from a water replenishing valve at the upper part of the condenser A or C.
And a second process (1300t/h) of high-flow closed circulation flushing purification of the low-pressure heater): the method comprises the following steps of supplementing water to a condenser, condensing a water pump, shaft seal heaters, finely processing condensed water, condensing and lifting the pump, deaerator liquid level regulating valves, 1-2 low-added A/B/C-3-4 low-added A/B and bypasses thereof, deaerating heads, deaerating water tanks, small circulation cleaning valves (located in a pipeline 2, after large-flow cleaning water enters the deaerating water tanks, returning water flows back to the condenser through the small circulation cleaning pipeline (namely the pipeline 2) based on gravity flow, and circulation, condenser-condenser (water mixing) sewage discharge and backwashing of a filter screen at an inlet of the condensing water pump are formed.
Flow three (high-pressure heater large-flow closed circulation flushing purification (1700 t/h)): the method comprises the following steps of condensing a condenser, a condensate pump, a shaft seal heater, a condensate fine treatment device, a condensate pump, a deaerator liquid level regulating valve, a high-flow water quality regulating and isolating valve (located in a pipeline 1), a main water supply pump outlet main pipe, 6-7 high-pressure A/B and a bypass thereof, a main water supply main pipe, a long circulating cleaning valve, discharging of a condenser (mixed water) and backwashing of a filter screen. It is noted that while run three, the main feed pump can be run to initiate a deoxygenated tank-main feed pump purge flush (specifically, deoxygenated tank refill (line 5) -deoxygenated tank-pre-pump-main feed pump a/B/C-main feed pump small cycle-small cycle purge valve/blow down valve).
Flow four (short-time large-flow high-temperature washing and purifying of high-pressure heater): vacuumizing a condenser, heating a deaerator, adding an A/B (alkaline/alkaline) and a bypass thereof to 6-7 by a main water feed pump, a main water feed main pipe, a long circulating cleaning valve, discharging sewage by the condenser (mixing water), and backwashing an inlet filter screen of a condensate pump.
The water purification flushing procedure of the present invention is compared with a known system water purification flushing procedure based on, for example, figure 1:
firstly, when the nuclear power station is normally started
1) Procedure one is unchanged from known nuclear power plant flush procedures, typically requiring one to two days.
2) And the second and third flows show that the large-flow closed continuous flushing is adopted, so that the waste water discharge pressure of the condenser is effectively reduced, and compared with the known short-time flushing pollution discharge method, the time and the total water consumption are saved. Especially, flow three, high pressure feed water pump start purification oxygen-eliminating device is gone on simultaneously with the long circulation closed washing of high pressure feed water heater, can reduce about three days time, and wherein, three rows low pressure feed water heater wash and practice thrift one day, and main feed water pump starts purification oxygen-eliminating device and practices thrift two days.
3) For the fourth flow, because the condensate pump is used for closed large-flow circulating flushing of the high-pressure heater row in the third flow, the iron ion content in the whole power station water system loop is greatly reduced, and compared with the known two rows of high heaters of the nuclear power station and short-time flushing of a bypass thereof, the closed large-flow circulating flushing of the high-pressure heater row takes two to three days and can be completed within one day by compression.
Therefore, compared with the known flushing process, the invention has the following advantages in terms of the requirement of water quality adjustment time: the first flow is not changed, the second flow and the third flow can be saved for three days, and the fourth flow is saved for one day. The invention can compress the two-loop water quality adjusting time of the early nuclear power station from one week to about three days, realizes that one-time single-machine starting can save energy consumption and labor cost for nearly four days, and can also save a large amount of desalted water discharge.
Second, when the water quality of the second loop of the nuclear power station heat test is purified and adjusted for the first time
During the nuclear power plant heat test, the two loops start water purification, because the power plant is started for the first time, foreign matters and impurities in the system are most remained, such as impurities and corrosion products generated in the manufacturing/storage/installation/debugging process of equipment and the system, generally, a water purification adjustment plan which is more strict than that of the normal starting of the nuclear power plant is made, and the water purification adjustment plan is flushed and purified section by section and equipment by equipment one by one, if a certain nuclear power plant is used, the water purification adjustment is continuously performed 24 hours every day after the first starting of the two loops of the heat test from the beginning to the end, and the water purification is completed in 29 days in total. If the invention and the implementation method thereof are adopted, half time is saved by referring to the normal start of the nuclear power station, the preliminary estimation can compress the first start water quality purification adjustment of the second loop of the hot test to half a month, shorten the half-month debugging period (the water quality adjustment is the key path of the hot test), and correspondingly save a large amount of electricity, desalted water, industrial water, chemicals, wastewater, labor cost and the like.
In addition, the invention can adopt the condensate pump as a single power source, and the deaerator liquid level regulating valve is used for sequentially flushing and purifying low pressure feed and high pressure feed, so that the operation is simplified. In terms of high water filling and exhausting, the main water supply system of the known nuclear power station needs to manually open a small balance valve of an electric isolation valve on site for manual downstream water filling, and the time is long.
In summary, the present invention can obtain at least one of the following technical effects:
1) because the large-flow closed-cycle continuous flushing is adopted, the flushing of the low-pressure heater and the purification of the deaerator by the main feed pump are carried out simultaneously, the short-time large-flow high-temperature flushing and purification process of the four-high-pressure heater in the process is weakened, the normal starting water quality adjusting time of a conventional island can be effectively shortened by about four days, and the first water quality purification and adjustment of a second loop in the thermal test of the nuclear power station is shortened by half a month. Based on the scheme of the invention, frequent local drainage operation of the power station is reduced, water consumption is reduced, and meanwhile, the loop system is simple to operate in the master control room, so that the operation intensity of operators of the nuclear power station is greatly reduced. By the technical scheme, the defect that the unit starting time is long due to the fact that the conventional nuclear power station adopts one-way short-time intermittent flushing and consumes long time is overcome.
2) The operation economy is improved. Through estimation, the single-time starting of the nuclear power station can save four days, the electricity can be saved by more than 120 ten thousand per day by calculating that the electricity load exceeds fifty thousand KW per day, and by the addition of saving several thousand tons of demineralized water and four days of labor cost, the water quality can be saved by more than 500 ten thousand once by starting a single machine; the water quality of the second hot test loop of the nuclear power station is purified and adjusted for the first time, the debugging period of a half month can be shortened, and the conservative estimation of electricity and water saving reaches over 1000 ten thousand yuan. In the normal operation stage of the nuclear power station, the water quality purification adjustment time which needs one week for starting the original unit is compressed to 2-3 days for completion, so that the water quality purification effect is ensured, the risk of water quality deterioration in the power stage is reduced, the equipment operation power consumption during the starting of the unit is reduced, the time is strived for the early synchronization of the nuclear power station, the electricity, water and labor cost can be saved by hundreds of thousands of yuan for one-time unit starting, and the economic benefit is remarkable.
3) The condensate pump is used as a water quality adjusting power source of a whole plant, the operation is simple, the operation personnel can realize large-flow closed circulation flushing only by operating the deaerator liquid level regulating valve, and the flow regulating method is simple.
4) The starting work of the unit is more continuous and effective, the water quality adjustment work to be finished in one week is completed in two to three days, and the frequency of water supplement and pollution discharge of the short-time pollution discharge condenser adopted in the early stage and the on-site water discharge operation workload are reduced.
5) The method greatly shortens the time for purifying the water quality of the two loops during the thermal test of the nuclear power station, ensures the water quality and reduces the wastewater discharge. The preliminary estimation shortens the water quality adjustment time of half a month, and correspondingly saves a large amount of electricity, desalted water, industrial water, chemicals, a large amount of waste water, labor cost and the like. The economic benefit and the social benefit are obvious.
6) The integration design of the small circulation pipe diameter and the high lengthened circulation pipe diameter of the deaerator and the improvement of the water replenishing capacity of the condenser and the deaerator can accelerate the water mixing and pollution discharge of a water system and improve the flexibility of starting water quality adjustment operation of the two loops;
7) before the unit is vacuumized, the whole system performs high-flow closed circulation washing and purification, so that the probability of foreign matter accumulation is reduced, and the service life of the fine processing resin is prolonged;
8) the invention is suitable for all types of pressurized water reactor nuclear power plant projects and the water quality adjustment requirements of the hot test and start stages of the pressurized water reactor nuclear power plant projects.
In the above description, the two-circuit system of the nuclear power plant is taken as an example, and it should be noted that the technical solution of the present invention can also be applied to other power plants having the circuit system.
It should also be noted that, in the present invention, the pipeline is connected to a certain equipment unit, and the bypass pipeline connected to the equipment unit is also included, for example, for the pipeline connected to the condensate polishing device, the pipeline connected to the condensate polishing device body may be included, and the pipeline connected to the condensate polishing device bypass may also be included.
Although the condensate pump is used as a single power source for flushing the low-plus and high-plus circuits in the present invention, another pumping device may be provided in the pipe 2 in fig. 2 to realize a condenser-low-plus-condenser flushing cycle in cooperation with the condensate pump.
It should also be noted that in the present invention, the pipe 1 is led out from the outlet of the deaerator liquid level regulating valve, but the present invention is not limited thereto as long as the pipe 1 is communicated with the outlet of the condensate pump, for example, the inlet of the pipe 1 may be located at the inlet or the outlet of the shaft seal heater in fig. 2, may be located at the outlet of the condensate polishing device or the outlet of the condensate pump, and these are within the protection scope of the present invention.
Based on the above, the invention provides the following technical scheme:
1. a loop system for a power plant, comprising: a condenser, a condensate pump, a low-temperature heater, a deoxidizing water tank, a main water supply pump, a high-temperature heater and a main water supply main pipe,
wherein:
the loop system further comprises a first flow path and a third flow path, the first flow path is communicated with an outlet of the condensate pump and an inlet of the high-temperature heater and is provided with a first valve, the third flow path is communicated with a main water supply main pipe and the condenser and is provided with a second valve, and the first flow path and the third flow path are used for forming continuous internal circulation of the condenser, the high-temperature heater and the condenser.
2. The circuit system of claim 1, wherein:
the loop system also comprises a second flow path, the second flow path is communicated with the deoxygenation water tank and the condenser and is provided with a third valve, and the second flow path is used for forming continuous internal circulation of the condenser-the low-temperature heater-the deoxygenation water tank-the condenser; or
The loop system further comprises a second flow path, the second flow path is communicated with the deoxygenation water tank and the condenser and is provided with a third valve, the second flow path is used for forming continuous internal circulation of the condenser-low-temperature heater-deoxygenation water tank-condenser, the second flow path is designed to allow fluid from the deoxygenation water tank to enter the condenser based on gravity, and the flow capacity of the second flow path based on gravity is not less than 700 t/h.
3. The circuit system according to 1 or 2, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline which is communicated with the deoxidizing water tank and an outlet of the main water supply pump.
4. The circuit system of claim 3, wherein:
the loop system also comprises a water replenishing pipe of the deoxygenation water tank, and the circulation capacity of the water replenishing pipe is not less than 150 t/h.
5. The circuit system according to 1 or 2, wherein:
the loop system also comprises a condenser circulating pipeline for communicating the outlet of the condensed water pump with the condenser; or
The loop system also comprises a condenser water replenishing pipe, and the circulation capacity of the condenser water replenishing pipe is not less than 150 t/h.
6. The circuit system according to 1 or 2, wherein:
at least one of the flow paths is provided with a sewage draining outlet.
7. The circuit system according to 1 or 2, wherein:
the loop system also comprises a shaft seal heater, a condensed water treatment device and a deaerator liquid level regulating device which are sequentially connected, wherein the shaft seal heater is arranged between the outlet of the condensed water pump and the condensed water treatment device, and the outlet of the deaerator liquid level regulating device is communicated with the inlet of the low-temperature heater;
the first flow path is communicated with an outlet of the deaerator liquid level adjusting device and an inlet of the high-temperature heater.
8. The circuit system according to 1 or 2, wherein:
the flow capacity of the first flow path is not less than 1300 t/h; and/or
The flow capacity of the third flow path is not less than 1700 t/h.
9. The circuit system according to 1 or 2, wherein:
the loop system is a secondary loop for the nuclear power station.
10. A method of flushing a loop system for a power plant, wherein:
the circuit system is according to 1 or 2, and the flushing method comprises:
the method comprises the following steps: and pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through the first flow path, the high-temperature heater, the main water supply main pipe and the third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser.
11. The method of claim 10, wherein:
the method also comprises the following steps: pumping water from the condenser by using a condensate pump, enabling the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser; or
The loop system also comprises a condenser water replenishing pipe, and the method also comprises the following steps: and supplementing water to the condenser by using a condenser water supplementing pipe, pumping water from the condenser by using a condensate pump to enable the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser.
12. The method of claim 10, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline arranged between the deoxidizing water tank and the outlet of the main water supply pump;
the method also comprises the third step: and the circulating flushing of the water in the deoxygenation water tank based on the main water supply pump is realized by utilizing the circulating pipeline of the deoxygenation water tank.
13. The method of claim 12, wherein:
the loop system also comprises a water replenishing pipe of a deoxygenation water tank; and is
And step three, water is supplemented to the deoxygenation water tank by utilizing the deoxygenation water tank water supplementing pipe.
14. The method of claim 12 or 13, wherein:
the method executes the third step while executing the first step.
15. The method of claim 10, wherein:
the loop system also comprises a condenser circulating pipeline for communicating the outlet of the condensed water pump with the condenser;
the method further comprises the fourth step of: and the water in the condenser is circularly flushed by the condensate pump by utilizing the condenser circulating pipeline.
16. The method of claim 15, wherein:
the loop system also comprises a condenser water replenishing pipe; and is
And step four, supplementing water to the condenser by using a condenser water supplementing pipe.
17. The method of claim 10, wherein:
the method comprises the following steps: and pumping water in the deoxygenation water tank by using a main water feeding pump, and enabling the water to enter a condenser through a high-temperature heater, a main water feeding main pipe and a third flow path.
18. The method of claim 17, wherein:
the fifth step is performed after the first step.
19. The method of 18, wherein:
and fifthly, after the condenser is vacuumized and the deoxygenation water tank is heated, pumping water in the deoxygenation water tank by using a main water feeding pump, and enabling the water to enter the condenser through the high-temperature heater, the main water feeding main pipe and the third flow path.
20. The method of claim 10, further comprising the steps of:
enabling the deaerator drainage to flow into the condenser through the third flow path by gravity; or
So that the water discharged by the deaerator flows into the condenser through the second flow path by gravity.
21. A method of flushing a loop system for a power plant, wherein:
the loop system is the loop system according to 2, the loop system further comprises a condenser circulation pipeline for communicating an outlet of the condensed water pump with the condenser, and the flushing method sequentially comprises the following steps:
(1) the circulating flushing of the water in the condenser on a condensate pump is realized by utilizing a condenser circulating pipeline;
(2) pumping water from the condenser by using a condensate pump, enabling the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser;
(3) pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through a first flow path, a high-temperature heater, a main water supply main pipe and a third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser; and
(4) after the condenser is vacuumized and the deaerating water tank is heated, water in the deaerating water tank is pumped by using a main water feeding pump and enters the condenser through the high-temperature heater, the main water feeding main pipe and the third flow path.
22. The method of claim 21, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline which is communicated with the deoxidizing water tank and an outlet of the main water supply pump;
the method performs the following steps while performing the step (3): and the circulating flushing of the water in the deoxygenation water tank based on the main water supply pump is realized by utilizing the circulating pipeline of the deoxygenation water tank.
23. A power plant comprising a loop system according to any of claims 1-9.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (23)
1. A loop system for a power plant, comprising: a condenser, a condensate pump, a low-temperature heater, a deoxidizing water tank, a main water supply pump, a high-temperature heater and a main water supply main pipe,
wherein:
the loop system also comprises a first flow path and a third flow path, the first flow path is communicated with the outlet of the condensate pump and the inlet of the high-temperature heater and is provided with a first valve, the third flow path is communicated with the main water supply main pipe and the condenser and is provided with a second valve, and the first flow path and the third flow path are used for forming continuous internal circulation of the condenser-the high-temperature heater-the condenser;
the loop system also comprises a shaft seal heater, a condensed water treatment device and a deaerator liquid level adjusting device which are sequentially connected, wherein the shaft seal heater is arranged between the outlet of the condensed water pump and the condensed water treatment device, and the outlet of the deaerator liquid level adjusting device is communicated with the inlet of the low-temperature heater.
2. The circuit system of claim 1, wherein:
the loop system also comprises a second flow path, the second flow path is communicated with the deoxygenation water tank and the condenser and is provided with a third valve, and the second flow path is used for forming continuous internal circulation of the condenser-the low-temperature heater-the deoxygenation water tank-the condenser; or
The loop system further comprises a second flow path, the second flow path is communicated with the deoxygenation water tank and the condenser and is provided with a third valve, the second flow path is used for forming continuous internal circulation of the condenser-low-temperature heater-deoxygenation water tank-condenser, the second flow path is designed to allow fluid from the deoxygenation water tank to enter the condenser based on gravity, and the flow capacity of the second flow path based on gravity is not less than 700 t/h.
3. The circuit system according to claim 1 or 2, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline which is communicated with the deoxidizing water tank and an outlet of the main water supply pump.
4. The circuit system of claim 3, wherein:
the loop system also comprises a water replenishing pipe of the deoxygenation water tank, and the circulation capacity of the water replenishing pipe is not less than 150 t/h.
5. The circuit system according to claim 1 or 2, wherein:
the loop system also comprises a condenser circulating pipeline for communicating the outlet of the condensed water pump with the condenser; or
The loop system also comprises a condenser water replenishing pipe, and the circulation capacity of the condenser water replenishing pipe is not less than 150 t/h.
6. The circuit system according to claim 1 or 2, wherein:
at least one of the first flow path and the third flow path is provided with a sewage draining outlet.
7. The circuit system according to claim 1 or 2, wherein:
the first flow path is communicated with an outlet of the deaerator liquid level adjusting device and an inlet of the high-temperature heater.
8. The circuit system according to claim 1 or 2, wherein:
the flow capacity of the first flow path is not less than 1300 t/h; and/or
The flow capacity of the third flow path is not less than 1700 t/h.
9. The circuit system according to claim 1 or 2, wherein:
the loop system is a secondary loop for the nuclear power station.
10. A method of flushing a loop system for a power plant, wherein the loop system is according to claim 2, the method comprising:
the method comprises the following steps: and pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through the first flow path, the high-temperature heater, the main water supply main pipe and the third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser.
11. The method of claim 10, wherein:
the method also comprises the following steps: pumping water from the condenser by using a condensate pump, enabling the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser; or
The loop system also comprises a condenser water replenishing pipe, and the method also comprises the following steps: and supplementing water to the condenser by using a condenser water supplementing pipe, pumping water from the condenser by using a condensate pump to enable the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser.
12. The method of claim 10, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline arranged between the deoxidizing water tank and the outlet of the main water supply pump;
the method also comprises the third step: and the circulating flushing of the water in the deoxygenation water tank based on the main water supply pump is realized by utilizing the circulating pipeline of the deoxygenation water tank.
13. The method of claim 12, wherein:
the loop system also comprises a water replenishing pipe of a deoxygenation water tank; and is
And step three, water is supplemented to the deoxygenation water tank by utilizing the deoxygenation water tank water supplementing pipe.
14. The method of claim 12 or 13, wherein:
the method executes the third step while executing the first step.
15. The method of claim 10, wherein:
the loop system also comprises a condenser circulating pipeline for communicating the outlet of the condensed water pump with the condenser;
the method further comprises the fourth step of: and the water in the condenser is circularly flushed by the condensate pump by utilizing the condenser circulating pipeline.
16. The method of claim 15, wherein:
the loop system also comprises a condenser water replenishing pipe; and is
And step four, supplementing water to the condenser by using a condenser water supplementing pipe.
17. The method of claim 10, wherein:
the method comprises the following steps: and pumping water in the deoxygenation water tank by using a main water feeding pump, and enabling the water to enter a condenser through a high-temperature heater, a main water feeding main pipe and a third flow path.
18. The method of claim 17, wherein:
the fifth step is performed after the first step.
19. The method of claim 18, wherein:
and fifthly, after the condenser is vacuumized and the deoxygenation water tank is heated, pumping water in the deoxygenation water tank by using a main water feeding pump, and enabling the water to enter the condenser through the high-temperature heater, the main water feeding main pipe and the third flow path.
20. The method of claim 10, further comprising the step of:
enabling the deaerator drainage to flow into the condenser through the third flow path by gravity; or the water discharged by the deaerator flows into the condenser through the second flow path by gravity.
21. A method for flushing a circuit system for a power plant, wherein the circuit system is a circuit system according to claim 2, the circuit system further comprising a condenser circulation line for communicating an outlet of a condensate pump with a condenser, the method comprising the steps of, in order:
(1) the circulating flushing of the water in the condenser on a condensate pump is realized by utilizing a condenser circulating pipeline;
(2) pumping water from the condenser by using a condensate pump, enabling the water to enter the deoxygenation water tank through the low-temperature heater, and enabling the water in the deoxygenation water tank to enter the condenser through a second flow path based on gravity to form continuous circulating flushing of the condenser, the low-temperature heater, the deoxygenation water tank and the condenser;
(3) pumping water from the condenser by using a condensate pump, and enabling the water to enter the condenser through a first flow path, a high-temperature heater, a main water supply main pipe and a third flow path to form continuous circulating flushing of the condenser, the high-temperature heater and the condenser; and
(4) after the condenser is vacuumized and the deaerating water tank is heated, water in the deaerating water tank is pumped by using a main water feeding pump and enters the condenser through the high-temperature heater, the main water feeding main pipe and the third flow path.
22. The method of claim 21, wherein:
the loop system also comprises a deoxidizing water tank circulating pipeline which is communicated with the deoxidizing water tank and an outlet of the main water supply pump;
the method performs the following steps while performing the step (3): and the circulating flushing of the water in the deoxygenation water tank based on the main water supply pump is realized by utilizing the circulating pipeline of the deoxygenation water tank.
23. A power plant comprising a loop system according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278075.5A CN111121483B (en) | 2019-12-12 | 2019-12-12 | Loop system for power station, flushing method of loop system and power station with loop system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278075.5A CN111121483B (en) | 2019-12-12 | 2019-12-12 | Loop system for power station, flushing method of loop system and power station with loop system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111121483A CN111121483A (en) | 2020-05-08 |
| CN111121483B true CN111121483B (en) | 2021-10-29 |
Family
ID=70498513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911278075.5A Active CN111121483B (en) | 2019-12-12 | 2019-12-12 | Loop system for power station, flushing method of loop system and power station with loop system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111121483B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550764A (en) * | 2020-06-10 | 2020-08-18 | 三门核电有限公司 | Nuclear power plant starting two-loop flushing method |
| CN111550765A (en) * | 2020-06-10 | 2020-08-18 | 三门核电有限公司 | Nuclear power plant starting secondary loop large-flow intermittent washing method |
| CN114920315B (en) * | 2022-05-25 | 2023-04-28 | 中国核电工程有限公司 | Deoxidizing device, deoxidizing system and water treatment method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2656096C3 (en) * | 1976-12-10 | 1979-06-13 | Kraftwerk Union Ag, 4330 Muelheim | Cleaning system for the water to be evaporated in the steam generator of a nuclear reactor |
| JPS60101204A (en) * | 1983-11-08 | 1985-06-05 | Mitsubishi Heavy Ind Ltd | Cleanup method in thermal power plant |
| FR2641370B1 (en) * | 1988-12-29 | 1994-05-27 | Henkel France | PRODUCT FOR THE CLEANING OF PLATE EXCHANGERS ESPECIALLY IN THE NUCLEAR INDUSTRY AS WELL AS PROCESS IMPLEMENTED WHEN USING THIS PRODUCT |
| JP2013176735A (en) * | 2012-02-28 | 2013-09-09 | Mitsubishi Heavy Ind Ltd | Cleaning method and apparatus for condensate flow path |
| US9922734B2 (en) * | 2012-12-28 | 2018-03-20 | Ge-Hitachi Nuclear Energy Americas Llc | Containment vent system with passive mode for boiling water reactors (BWRS), and method thereof |
| US11802689B2 (en) * | 2017-06-20 | 2023-10-31 | Boyle Energy Services & Technology, Inc. | Commissioning power plants |
| CN107665744B (en) * | 2017-08-29 | 2019-07-02 | 中广核工程有限公司 | Nuclear power station secondary loop flusher and its purging method |
-
2019
- 2019-12-12 CN CN201911278075.5A patent/CN111121483B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111121483A (en) | 2020-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111121483B (en) | Loop system for power station, flushing method of loop system and power station with loop system | |
| CN107665744B (en) | Nuclear power station secondary loop flusher and its purging method | |
| CN101303201A (en) | Method of waste heat recovery utilization in cheese dyeing course | |
| CN104121803B (en) | A kind of hot douche of Air-Cooling Island not restricted by the desalination water yield | |
| CN201852520U (en) | Thermal state flushing device of direct air cooling system in thermal power plant | |
| CN203642731U (en) | Harmon type indirect air cooling circulating water recovery system | |
| CN206271432U (en) | Nuclear power plant's secondary circuit rinses cooling and drainage arrangement | |
| CN202065018U (en) | Water-drainage recycling water-saving system during starting up of circulating water waste heat recycling utilization system | |
| CN111672837B (en) | Pipeline high-flow flushing method | |
| CN111550764A (en) | Nuclear power plant starting two-loop flushing method | |
| CN112495953A (en) | Method for cleaning main steam pipeline of high-temperature reactor | |
| CN111810257A (en) | Flushing system and flushing method for salt deposit of power station steam turbine | |
| CN106120954A (en) | Thermal power plant's water circulation system | |
| CN113684636B (en) | High-temperature dye vat waste heat recovery device and use method thereof | |
| CN210862368U (en) | Steam generator cleaning system | |
| WO2013157989A1 (en) | System of leakage drains for a main circulating pump assembly | |
| CN113198328A (en) | Method for offline cleaning and testing reverse osmosis membrane | |
| CN112610939A (en) | Recovery method and recovery system for low-level waste heat of sand acid | |
| CN113606646A (en) | Automatic control system and method for drainage recovery of heat supply network | |
| CN113889291B (en) | Flushing system and flushing method for two loops of high-temperature gas cooled reactor | |
| CN109404875A (en) | A kind of cold conditions purging method of the ultra supercritical double reheat boiler without circulating pump | |
| CN214173012U (en) | Condensate fine treatment system | |
| CN220649196U (en) | Mine water waste heat high-efficiency utilization device | |
| CN217442056U (en) | Automatic flushing device for cooler | |
| CN213450528U (en) | Combined cycle unit drainage system that low level was arranged |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210111 Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant after: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant before: STATE NUCLEAR POWER ENGINEERING Co. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |