CN213538110U - Chemical cleaning system for two loops of high-temperature gas cooled reactor nuclear power unit - Google Patents
Chemical cleaning system for two loops of high-temperature gas cooled reactor nuclear power unit Download PDFInfo
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- CN213538110U CN213538110U CN202022560161.XU CN202022560161U CN213538110U CN 213538110 U CN213538110 U CN 213538110U CN 202022560161 U CN202022560161 U CN 202022560161U CN 213538110 U CN213538110 U CN 213538110U
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- 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 utility model discloses a chemical cleaning system of two return circuits of high temperature gas cooled reactor nuclear power unit, this cleaning system include the dispensing system who connects the oxygen-eliminating device through adding the medicine pipeline, wash power and be provided by the pre-pump, through interim pipeline bypass steam generator, connect main water supply pipe and main steam pipe, the washing liquid returns the oxygen-eliminating device to by interim system through main steam pipe, circulate and wash two return circuits oxygen-eliminating device of high temperature gas cooled reactor nuclear power unit, high pressure feed water heater, water supply pipe, steam conduit, start-up separator; arranging corrosion on-line monitoring equipment on a temporary pipeline from the main steam pipeline to the deaerator to realize the real-time monitoring of the corrosion rate during the chemical cleaning; heating the cleaning liquid by adopting a deaerator heating mode; the utility model discloses can realize that high temperature gas cooled piles that nuclear power unit two return circuits system is high-efficient clean, get rid of corrosion result and cinder completely, reduce the risk of unit operation period steam generator impurity deposit, provide the assurance for power station safety, economic operation.
Description
Technical Field
The utility model belongs to the technical field of nuclear power unit chemical cleaning, concretely relates to high temperature gas cooled piles chemical cleaning system in two return circuits of nuclear power unit.
Background
The high-temperature gas cooled reactor is a fourth-generation nuclear power technology, is an advanced reactor type with inherent safety, and has wide application prospects in the fields of power generation, heat supply, hydrogen production, seawater desalination and the like. Compared with a pressurized water reactor nuclear power unit, the high-temperature gas cooled reactor steam generator has extremely strict requirements on water quality, and a water supply and steam system must be cleaned before operation to ensure that the water quality meets the requirements.
At present, the mainstream cleaning scheme of the secondary loop of the domestic nuclear power unit is air blowing, water washing and manual cleaning. Due to the structural difference between the second loop of the high-temperature gas-cooled reactor and the pressurized water reactor unit, a pressure container required by air purging is not available, so that the second loop of the high-temperature gas-cooled reactor is clean and difficult to purge by air; the corrosion products in the construction stage cannot be removed by adopting water washing, and the cleaning requirement of a second loop of the high-temperature gas-cooled reactor cannot be met; on the other hand, the inner diameter of a high-pressure water supply pipeline and a low-pressure water supply pipeline of the two-loop steam system is 169-309 mm, the maximum inner diameter of a main steam pipeline is 296mm, and the implementation of a manual cleaning scheme is limited. The chemical cleaning is used as a cleaning method of a conventional thermal power plant boiler, has the advantages of mature process, easy operation, good cleaning effect and the like, and is a preferred method for cleaning a two-loop.
Compared with chemical cleaning of a thermal power boiler, the chemical cleaning of the high-temperature gas cooled reactor secondary loop has the following difficulties: 1) the secondary loop system of the high-temperature gas cooled reactor nuclear power unit is complex, the pipelines are made of various materials and have large pipe diameter difference, and all the pipelines need to be ensured to have enough cleaning flow rate; 2) the high-temperature gas cooled reactor secondary loop does not have a superheater and a reheater, is difficult to clean in sections, and the water supply pipeline and the steam pipeline are integrally connected in series for cleaning, so that the corrosion of all materials is controllable.
Disclosure of Invention
An object of the utility model is to provide a chemical cleaning system in two return circuits of high temperature gas cooled reactor nuclear power unit can get rid of corrosion result and cinder in two return circuits of high temperature gas cooled reactor completely, guarantees that all material corrosion rate do not exceed standard, and the corrosion of austenitic stainless steel point does not take place to corrode and intercrystalline.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a chemical cleaning system for a secondary loop of a high-temperature gas-cooled reactor nuclear power unit comprises a dispensing system 1, a dosing pipeline 2, a first temporary pipeline 6, a second temporary pipeline 10 and corrosion online monitoring equipment 11, wherein the dispensing system 1 is connected with a deaerator 3 of the secondary loop of the high-temperature gas-cooled reactor nuclear power unit through the dosing pipeline 2, and cleaning power is provided by a front pump 4 at the outlet of the deaerator 3; the inlet of the first temporary pipeline 6 is connected with a main water supply pipeline of a secondary loop of the high-temperature gas-cooled reactor nuclear power generator, the outlet of the first temporary pipeline is connected with a main steam pipeline 8 of the secondary loop of the high-temperature gas-cooled reactor nuclear power generator, and a steam generator 7 connected between the main water supply pipeline and the main steam pipeline 8 is bypassed through the first temporary pipeline 6; the inlet of the second temporary pipeline 10 is connected with a main steam pipeline 8 of a second loop of the high-temperature gas-cooled reactor nuclear power unit, the outlet of the second temporary pipeline is connected with the inlet of a deaerator 3 of the second loop of the high-temperature gas-cooled reactor nuclear power unit, and the corrosion on-line monitoring equipment 11 is arranged on the second temporary pipeline 10; the cleaning solution circularly cleans a deaerator 3, a main water supply pipeline, a high-pressure heater 5, a main steam pipeline 8 and a starting separator 9 of a secondary loop of the high-temperature gas cooled reactor nuclear power generating unit in sequence, and then returns to the deaerator 3 through a second temporary pipeline 10 through the main steam pipeline 8.
The corrosion on-line monitoring device 11 measures the corrosion rates of different materials by adopting a linear polarization resistance method, and realizes the real-time monitoring of the corrosion rates during the chemical cleaning.
The cleaning liquid is heated by adopting a heating mode of a deaerator 3, and the heating rate is controlled to be 10-50 ℃/h.
A Y-shaped filter 12 with the filtering precision not less than 2mm is arranged on a descending pipe from the deaerator 3 to an inlet of the front pump 4 for cleaning, so that foreign matters are prevented from entering a secondary loop of the high-temperature gas cooled reactor nuclear power unit.
Firstly, injecting demineralized water into the chemical cleaning system of the second loop of the high-temperature gas-cooled reactor nuclear power generator, and starting three front pumps 4 to perform system circulation; then, a deaerator 3 is heated, the water temperature of the system is increased to the cleaning temperature, and the heating rate is controlled to be 10-50 ℃/h; a chemical cleaning agent and a corrosion inhibitor are configured by adopting a dispensing system 1, the configured cleaning solution is supplemented into a deaerator 3 through a dosing pipeline 2, chemical cleaning is started, the cleaning solution circularly cleans the deaerator 3, a main water supply pipeline, a high-pressure heater 5, a main steam pipeline 8 and a starting separator 9 of a high-temperature gas cooled reactor nuclear power unit secondary loop in sequence, and then the cleaning solution returns to the deaerator 3 through a second temporary pipeline 10 through the main steam pipeline 8; starting the corrosion on-line monitoring equipment 11 to perform real-time monitoring on the corrosion rate during the chemical cleaning, and adjusting the concentration of the corrosion inhibitor in the cleaning solution to ensure that the corrosion rate of the cleaning material is controlled to be 2 g/(m)2H) within; the flow of each cleaning loop is measured through a portable flowmeter, so that the cleaning system is ensured to have enough cleaning flow speed; analyzing and testing the acid concentration and the total iron ion concentration of the cleaning solution, and when the acid concentration and the total iron ion concentration of the cleaning solution are kept stable and do not change, cleaning up rust products and oxide scales in a monitoring pipe of the online corrosion monitoring equipment 11 by visual inspection, and finishing chemical cleaning.
The utility model provides a technical scheme has following beneficial effect:
the utility model provides a chemical cleaning system and a method for a secondary loop of a high-temperature gas cooled reactor nuclear power unit, which have good cleaning effect on rust products and oxide skin of the secondary loop system of the high-temperature gas cooled reactor nuclear power unit after capital construction and operation and can realize the integral series cleaning of a water supply pipeline and a steam pipeline; the front pump is adopted as cleaning circulating power, so that the cleaning flow rate is ensured, and the introduction of other impurities is inhibited; the corrosion rate of the cleaning material is effectively controlled by the corrosion on-line monitoring equipment to meet the requirements of relevant power industry standards.
Drawings
Fig. 1 is a schematic diagram of a chemical cleaning system for a two-circuit of a high temperature gas cooled reactor nuclear power plant according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the present invention, the use of directional terms such as "upper, lower, left, right" in the case where no description is made to the contrary generally means the reference to the drawings to refer to upper, lower, left, right.
The embodiment provides a chemical cleaning system for a secondary loop of a high-temperature gas-cooled reactor nuclear power unit, which comprises a dispensing system 1, a dosing pipeline 2, a first temporary pipeline 6, a second temporary pipeline 10 and corrosion online monitoring equipment 11, wherein the dispensing system 1 is connected with a deaerator 3 of the secondary loop of the high-temperature gas-cooled reactor nuclear power unit through the dosing pipeline 2, and cleaning power is provided by a front pump 4 at the outlet of the deaerator 3; the inlet of the first temporary pipeline 6 is connected with a main water supply pipeline of a secondary loop of the high-temperature gas-cooled reactor nuclear power generator, the outlet of the first temporary pipeline is connected with a main steam pipeline 8 of the secondary loop of the high-temperature gas-cooled reactor nuclear power generator, and a steam generator 7 connected between the main water supply pipeline and the main steam pipeline 8 is bypassed through the first temporary pipeline 6; the inlet of the second temporary pipeline 10 is connected with a main steam pipeline 8 of a second loop of the high-temperature gas-cooled reactor nuclear power unit, the outlet of the second temporary pipeline is connected with the inlet of a deaerator 3 of the second loop of the high-temperature gas-cooled reactor nuclear power unit, and the corrosion on-line monitoring equipment 11 is arranged on the second temporary pipeline 10; the cleaning solution circularly cleans a deaerator 3, a main water supply pipeline, a high-pressure heater 5, a main steam pipeline 8 and a starting separator 9 of a secondary loop of the high-temperature gas cooled reactor nuclear power generating unit in sequence, and then returns to the deaerator 3 through a second temporary pipeline 10 through the main steam pipeline 8.
In the chemical cleaning method for the chemical cleaning system of the high temperature gas cooled reactor nuclear power generating unit secondary loop in this embodiment, first, the chemical cleaning of the high temperature gas cooled reactor nuclear power generating unit secondary loop is performedThe system is filled with demineralized water, and three front pumps 4 are started to carry out system circulation; then, the deaerator 3 heats the water to raise the temperature of the system to the cleaning temperature; a chemical cleaning agent and a corrosion inhibitor are configured by adopting a dispensing system 1, the configured cleaning solution is supplemented into a deaerator 3 through a dosing pipeline 2, chemical cleaning is started, the cleaning solution circularly cleans the deaerator 3, a main water supply pipeline, a high-pressure heater 5, a main steam pipeline 8 and a starting separator 9 of a high-temperature gas cooled reactor nuclear power unit secondary loop in sequence, and then the cleaning solution returns to the deaerator 3 through a second temporary pipeline 10 through the main steam pipeline 8; starting the corrosion on-line monitoring equipment 11 to perform real-time monitoring on the corrosion rate during the chemical cleaning, and adjusting the concentration of the corrosion inhibitor in the cleaning solution to ensure that the corrosion rate of the cleaning material is controlled to be 2 g/(m)2H) within; the flow of each cleaning loop is measured through a portable flowmeter, so that the cleaning system is ensured to have enough cleaning flow speed; analyzing and testing the acid concentration and the total iron ion concentration of the cleaning solution, and when the acid concentration and the total iron ion concentration of the cleaning solution are kept stable and do not change, cleaning up rust products and oxide scales in a monitoring pipe of the online corrosion monitoring equipment 11 by visual inspection, and finishing chemical cleaning.
As the preferred embodiment of the utility model, the corrosion on-line monitoring equipment adopts the linear polarization resistance method to measure the corrosion rate of different materials, from this control corrosion inhibitor concentration.
As the preferred embodiment of the utility model, the heating temperature rise rate of the deaerator is controlled at 10 ℃/h to 50 ℃/h.
As the utility model discloses a preferred embodiment, oxygen-eliminating device to leading pump entry downcomer on set up the Y type filter that the filter fineness is not less than 2mm, through clearing up Y type filter 12, prevent that the foreign matter from getting into two loop system of high temperature gas cooled reactor.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical scheme of the utility model in the technical conception scope, can be right carry out multiple simple variant. Including each of the specific features, are combined in any suitable manner. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (1)
1. A chemical cleaning system for a high-temperature gas cooled reactor nuclear power unit secondary loop is characterized in that: the device comprises a dispensing system (1), a dosing pipeline (2), a first temporary pipeline (6), a second temporary pipeline (10) and corrosion online monitoring equipment (11), wherein the dispensing system (1) is connected with a deaerator (3) of a secondary loop of a high-temperature gas cooled reactor nuclear power unit through the dosing pipeline (2), and cleaning power is provided by a front pump (4) at the outlet of the deaerator (3); the inlet of the first temporary pipeline (6) is connected with a main water supply pipeline of a secondary loop of the high-temperature gas-cooled reactor nuclear power generator set, the outlet of the first temporary pipeline is connected with a main steam pipeline (8) of the secondary loop of the high-temperature gas-cooled reactor nuclear power generator set, and the first temporary pipeline (6) bypasses a steam generator (7) connected between the main water supply pipeline and the main steam pipeline (8); an inlet of the second temporary pipeline (10) is connected with a main steam pipeline (8) of a secondary loop of the high-temperature gas-cooled reactor nuclear power unit, an outlet of the second temporary pipeline is connected with an inlet of a deaerator (3) of the secondary loop of the high-temperature gas-cooled reactor nuclear power unit, and the corrosion on-line monitoring equipment (11) is arranged on the second temporary pipeline (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022560161.XU CN213538110U (en) | 2020-11-08 | 2020-11-08 | Chemical cleaning system for two loops of high-temperature gas cooled reactor nuclear power unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022560161.XU CN213538110U (en) | 2020-11-08 | 2020-11-08 | Chemical cleaning system for two loops of high-temperature gas cooled reactor nuclear power unit |
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| CN213538110U true CN213538110U (en) | 2021-06-25 |
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| CN202022560161.XU Active CN213538110U (en) | 2020-11-08 | 2020-11-08 | Chemical cleaning system for two loops of high-temperature gas cooled reactor nuclear power unit |
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- 2020-11-08 CN CN202022560161.XU patent/CN213538110U/en active Active
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