CN115475417A - Method and device for reducing oxygen content of medium in floating roof tank of nuclear power plant - Google Patents
Method and device for reducing oxygen content of medium in floating roof tank of nuclear power plant Download PDFInfo
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- CN115475417A CN115475417A CN202211010642.0A CN202211010642A CN115475417A CN 115475417 A CN115475417 A CN 115475417A CN 202211010642 A CN202211010642 A CN 202211010642A CN 115475417 A CN115475417 A CN 115475417A
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- oxygen content
- roof tank
- floating roof
- medium
- booster pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0073—Degasification of liquids by a method not covered by groups B01D19/0005 - B01D19/0042
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/54—Gates or closures
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the field of mechanical devices, and particularly relates to a method and a device for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant. Including isolating valve, dissolved oxygen sensor, booster pump, membrane deaerating plant and signal line, be connected with the isolating valve at floating roof tank bottom position, the isolating valve with float and install the dissolved oxygen sensor between the roof tank, the isolating valve low reaches are connected with the booster pump, the booster pump low reaches are connected with membrane deaerating plant, membrane deaerating plant export with float the roof tank and be connected, the dissolved oxygen sensor is connected with isolating valve, booster pump. Has the advantages that: the method can be started when the oxygen content is close to the limit value, and stopped when the oxygen content is reduced to a lower level, can automatically and efficiently realize the control of the oxygen content of the medium, has higher reliability compared with the conventional medium replacement method, and reduces the risk brought by the operation of personnel.
Description
Technical Field
The invention belongs to the field of mechanical devices, and particularly relates to a method and a device for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant.
Background
The floating roof tank is a container with a roof floating on the liquid level and floating up and down along with the change of the liquid level. The main structure of the tank comprises a top cover, a tank body and a film sleeve for connecting the top cover and the tank body.
The main drawbacks of this structure at present are:
1. the film sleeve has permeability, and when the requirement on the oxygen content of the medium in the tank is strict, the structure is difficult to ensure that the oxygen content is always in a qualified range.
2. If the system connected with the floating roof tank exhausts insufficiently and brings gas into the tank, the gas is gathered in the film sleeve and cannot be effectively exhausted, so that the oxygen content continuously exceeds the standard. The water storage tank of the floating roof structure is widely used in domestic nuclear power plants, the water storage tank requires extremely low oxygen content, and the operation experience shows that the floating roof tank is difficult to maintain the oxygen content level for a long time, and only when the oxygen content rises to be close to a limit value, the oxygen content can be ensured to reach the standard by discharging water with high oxygen content and injecting water with low oxygen content (a medium replacement method), thereby causing great waste of manpower and material resources. Under the condition of not changing the basic structure of the floating roof tank, the sealing performance of the connecting pipeline and equipment is improved, the sealing performance of the connecting part of the film sleeve and the top cover is improved, the sealing performance between the film sleeve and the tank wall is improved, the material of the film sleeve is changed, the air permeation is reduced, the effect is not ideal, and the oxygen content of the medium in the tank can not be always maintained at a lower level.
Disclosure of Invention
The invention aims to provide a method and a device for reducing the medium oxygen content in a floating roof tank of a nuclear power plant, which can overcome the defects of the existing floating roof tank in medium oxygen content control, keep the oxygen content at a lower level all the time, meet the production requirements and reduce the production cost.
The technical scheme of the invention is as follows: the utility model provides a reduce device of nuclear power plant floating roof jar interior medium oxygen content, includes isolation valve, dissolved oxygen sensor, booster pump, membrane oxygen removal device and signal line, is connected with the isolation valve in floating roof tank bottom position, and isolation valve and floating roof jar between the installation dissolved oxygen sensor, isolation valve low reaches and booster pump are connected, and booster pump low reaches and membrane oxygen removal device are connected, and the export of membrane oxygen removal device is connected with floating roof jar, and dissolved oxygen sensor is connected with isolation valve, booster pump.
The bottom of the floating roof tank is connected with the isolation valve through a pipeline in a way of existing inlet and outlet pipelines or punching.
The outlet of the membrane deoxygenation device is connected with the middle position of the floating roof tank through a pipeline.
The dissolved oxygen sensor is connected with the isolation valve and the booster pump by using signal lines.
A method for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant comprises the following steps:
step 201: detecting oxygen content and triggering signals;
step 202: media transport and circulation;
step 203: the membrane deoxygenation device carries out cyclic deoxygenation, and the above circulation is continuously carried out;
step 204: the deoxygenation oxygen content reaches the standard.
In step 201, when the dissolved oxygen sensor detects that the oxygen content is greater than or equal to 80% of the limit value requirement, namely 80ppb, the isolation valve is controlled to be opened through a signal line, and the booster pump is controlled to be started.
The medium with high oxygen content in the step 202 is pumped from the floating roof tank to the membrane deoxygenation device for deoxygenation, and the medium after deoxygenation is returned to the floating roof tank from the outlet of the membrane deoxygenation device through a pipeline.
And in the step 204, until the dissolved oxygen sensor detects that the oxygen content is less than or equal to 20% of the limit value requirement, namely 20ppb, controlling the booster pump to stop running through a signal line, and closing the isolating valve at the same time, thereby finally achieving the purpose of reducing the medium oxygen content in the floating roof tank.
The invention has the beneficial effects that: the method and the device for reducing the oxygen content of the medium in the floating roof tank can be started when the oxygen content is close to the limit value, and stopped when the oxygen content is reduced to a lower level, can automatically and efficiently realize the control of the oxygen content of the medium, have higher reliability than the conventional medium replacement method, and reduce the risk brought by personnel operation. Meanwhile, the method replaces the method for improving the sealing performance of connecting pipelines and equipment, improving the sealing performance of the joint of the film sleeve and the top cover, improving the sealing performance between the film sleeve and the tank wall, changing the complicated and inefficient treatment modes of reducing air permeability and the like by using the material of the film sleeve, and greatly saving the production cost.
Drawings
FIG. 1 is a schematic diagram of an apparatus for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant according to the present invention;
FIG. 2 is a flow chart of a method for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant according to the present invention.
In the figure: 101 floating roof tank, 102 isolating valve, 103 dissolved oxygen sensor, 104 booster pump, 105 film deoxygenation device, 106 signal line, 201 oxygen content detection and signal trigger, 202 medium transmission and circulation, 203 film deoxygenation device circulation deoxygenation, 204 complete deoxygenation oxygen content standard.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention relates to a device for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant, which is arranged on a drainage pipeline at the bottom of the floating roof tank and is connected with a membrane deoxygenation device. The membrane deoxygenator device uses a degassing membrane to achieve separation of the medium from oxygen. The degassing membrane enables the direct contact and separation of an aqueous phase and a gaseous phase, the aqueous phase being on one side of the membrane and the gaseous phase being on the other side of the membrane, the hydrophobic nature and the pore size of the membrane being such that water cannot pass through the pores into the gaseous phase.
And when the oxygen content is monitored to be close to the limit value, starting the oxygen removing device. The water with higher oxygen content enters the oxygen removing device.
In the deaerator, the oxygen in the medium is separated and the oxygen content of the medium is reduced. The low oxygen content medium flows out of the oxygen removal device, is connected through a pipeline and returns to the floating roof tank again. And continuously operating the deaerator to perform circular deaerating, and finally reducing the content of medium oxygen in the floating roof tank. After the oxygen content is reduced to the target value, the membrane deoxygenator device is shut down.
As shown in FIG. 1, the device for reducing the medium oxygen content in the floating roof tank of the nuclear power plant comprises an isolation valve 102, a dissolved oxygen sensor 103, a booster pump 104, a membrane deoxygenator device 105 and a signal wire 106. The bottom of the floating roof tank 101 is connected with an isolation valve 102 through a pipeline in a mode of existing inlet and outlet pipelines or punching holes, a dissolved oxygen sensor 103 is installed between the isolation valve 102 and the floating roof tank 101, the downstream of the isolation valve 102 is connected with a booster pump 104 through a pipeline, the downstream of the booster pump 104 is connected with a membrane oxygen removal device 105 through a pipeline, the outlet of the membrane oxygen removal device 105 is connected with the middle of the floating roof tank 101 through a pipeline, and the dissolved oxygen sensor 103 is connected with the isolation valve 102 and the booster pump 104 through a signal line 106.
As shown in fig. 2, a method for reducing the oxygen content of the medium in the floating roof tank of the nuclear power plant comprises the following steps:
step 201: oxygen content detection and signal triggering
When the dissolved oxygen sensor 103 detects that the oxygen content is greater than or equal to 80% of the limit value requirement, namely 80ppb, the isolation valve 102 is controlled to be opened through the signal line 106, and the booster pump 104 is controlled to be started;
step 202: media transport and circulation
Pumping the medium with high oxygen content from the floating roof tank 101 to the membrane deoxygenation device 105 for deoxygenation, and returning the deoxygenated medium from the outlet of the membrane deoxygenation device 105 to the floating roof tank 101 through a pipeline;
step 203: the membrane deoxygenation device can be used for circularly deoxygenating, and the above-mentioned circulation can be continuously implemented.
Step 204: the oxygen content of the deoxidized oxygen can reach the standard
Until the dissolved oxygen sensor 103 detects that the oxygen content is less than or equal to 20 percent, namely 20ppb, the booster pump 104 is controlled to stop through a signal line, and the isolation valve 102 is closed at the same time, so that the aim of reducing the medium oxygen content in the floating roof tank is finally fulfilled.
The invention has the following advantages: the oxygen content control of the medium can be automatically and efficiently realized, and the method has higher reliability compared with the conventional medium replacement method; the risk brought by personnel operation is reduced, and meanwhile, the labor is saved; the sealing performance of connecting pipelines and equipment is improved, the sealing performance of the joint of the film sleeve and the top cover is improved, the sealing performance between the film sleeve and the tank wall is improved, complicated and inefficient treatment modes such as reduction of air permeability and the like by the material of the film sleeve are changed, and the production cost is saved.
Claims (8)
1. The utility model provides a reduce device of nuclear power plant floating roof jar interior medium oxygen content which characterized in that: including isolating valve, dissolved oxygen sensor, booster pump, membrane deaerating plant and signal line, be connected with the isolating valve at floating roof tank bottom position, the isolating valve with float and install the dissolved oxygen sensor between the roof tank, the isolating valve low reaches are connected with the booster pump, the booster pump low reaches are connected with membrane deaerating plant, membrane deaerating plant export with float the roof tank and be connected, the dissolved oxygen sensor is connected with isolating valve, booster pump.
2. The apparatus for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant according to claim 1, wherein: the bottom of the floating roof tank is connected with the isolation valve through a pipeline in a way of existing inlet and outlet pipelines or punching.
3. The apparatus of claim 1, wherein the apparatus is configured to reduce the oxygen content of the medium in the floating roof tank of the nuclear power plant: the outlet of the membrane deoxygenation device is connected with the middle position of the floating roof tank through a pipeline.
4. The apparatus of claim 1, wherein the apparatus is configured to reduce the oxygen content of the medium in the floating roof tank of the nuclear power plant: the dissolved oxygen sensor is connected with the isolation valve and the booster pump by using signal lines.
5. A method for reducing the oxygen content of a medium in a floating roof tank of a nuclear power plant is characterized by comprising the following steps: the method comprises the following steps:
step 201: detecting oxygen content and triggering signals;
step 202: media transport and circulation;
step 203: the membrane deoxygenation device carries out cyclic deoxygenation, and the above circulation is continuously carried out;
step 204: the oxygen removal content reaches the standard.
6. The method of claim 5, wherein the method comprises the steps of: in step 201, when the dissolved oxygen sensor detects that the oxygen content is greater than or equal to 80% of the limit value requirement, namely 80ppb, the isolation valve is controlled to be opened through a signal line, and the booster pump is controlled to be started.
7. The method of claim 5, wherein the method comprises the steps of: the medium with high oxygen content in the step 202 is pumped from the floating roof tank to the membrane deoxygenation device for deoxygenation, and the medium after deoxygenation is returned to the floating roof tank from the outlet of the membrane deoxygenation device through a pipeline.
8. The method of claim 5, wherein the method comprises the steps of: and in the step 204, until the dissolved oxygen sensor detects that the oxygen content is less than or equal to 20% of the limit value requirement, namely 20ppb, controlling the booster pump to stop running through a signal line, and closing the isolating valve at the same time, thereby finally achieving the purpose of reducing the medium oxygen content in the floating roof tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010642.0A CN115475417A (en) | 2022-08-23 | 2022-08-23 | Method and device for reducing oxygen content of medium in floating roof tank of nuclear power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010642.0A CN115475417A (en) | 2022-08-23 | 2022-08-23 | Method and device for reducing oxygen content of medium in floating roof tank of nuclear power plant |
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| CN115475417A true CN115475417A (en) | 2022-12-16 |
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| CN202211010642.0A Pending CN115475417A (en) | 2022-08-23 | 2022-08-23 | Method and device for reducing oxygen content of medium in floating roof tank of nuclear power plant |
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| CN113860415A (en) * | 2021-09-24 | 2021-12-31 | 中广核陆丰核电有限公司 | Nuclear power plant emergency water supply tank deoxygenation method, water supply system and catalytic deoxygenation device |
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Patent Citations (8)
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| CN106870948A (en) * | 2017-03-27 | 2017-06-20 | 孙强丹 | The lazy envelope system of circulation and QHSE conveying methods based on source of the gas servomechanism installation |
| CN207001381U (en) * | 2017-04-28 | 2018-02-13 | 中国石油化工股份有限公司 | A kind of autonomous respiration Zero discharging system of nitrogen-sealed storage tank |
| CN107789956A (en) * | 2017-11-10 | 2018-03-13 | 南京天膜科技股份有限公司 | It is a kind of to realize internal floating roof tank interbedded gas VOCs zero-emissions, remove oxygen and recycle the device of nitrogen |
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| CN107954001A (en) * | 2017-12-20 | 2018-04-24 | 南京航空航天大学 | One kind is pressurized nitrogen fuel tank inerting system processed and its method of work |
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