CN115451646A - Drainage drying system of cooling system or equipment - Google Patents
Drainage drying system of cooling system or equipment Download PDFInfo
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- CN115451646A CN115451646A CN202211262536.1A CN202211262536A CN115451646A CN 115451646 A CN115451646 A CN 115451646A CN 202211262536 A CN202211262536 A CN 202211262536A CN 115451646 A CN115451646 A CN 115451646A
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- condensation
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- 238000001816 cooling Methods 0.000 title claims abstract description 161
- 238000001035 drying Methods 0.000 title claims abstract description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 258
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 126
- 239000002826 coolant Substances 0.000 claims abstract description 73
- 238000010926 purge Methods 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 36
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims description 48
- 239000007788 liquid Substances 0.000 claims description 48
- 230000005494 condensation Effects 0.000 claims description 43
- 230000005540 biological transmission Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 3
- 150000002829 nitrogen Chemical class 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000002285 radioactive effect Effects 0.000 abstract description 5
- 230000005855 radiation Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000009835 boiling Methods 0.000 description 10
- 239000011257 shell material Substances 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000005086 pumping Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000005484 gravity Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
-
- 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
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a drainage drying system of a cooling system or equipment, which is used for the cooling system or equipment of a target station and comprises a medium autonomous discharge system, a normal-temperature nitrogen purging system, a high-temperature nitrogen purging system and a vacuumizing drying system which are respectively communicated and connected with the cooling system. According to the invention, the drain valve and the storage tank are arranged below the cooling system, so that the problem of drainage dryness in the operation, maintenance and other emergency situations of the cooling system in the prior art when maintenance is required is solved, the radioactive gas is prevented from diffusing to a workplace, the worker is prevented from being polluted by internal radiation and the workplace, and the concentration of a coolant and the purity of nitrogen gas filled during starting are also ensured.
Description
Technical Field
The invention relates to the technical field of target station cooling of a spallation neutron source, in particular to a drainage drying system of a cooling system or equipment for a water cooling system of a target station.
Background
In a target station water cooling system of a spallation neutron source, a working environment or adopted cooling medium usually has certain radioactivity, and the cooling system needs to be vacuumized when running, overhauling and other emergency situations need maintenance, so that the aims of avoiding the radioactive medium or gas from diffusing to a working place to cause internal radiation and pollution to the working place and ensuring the concentration of a coolant and the purity of nitrogen gas filled during starting are fulfilled, and the residual quantity of the cooling medium in the cooling system is required to be reduced as much as possible before each overhauling. However, the cooling medium of the existing cooling system is disposable, and is directly disposed after emission reduction, so that the environment is polluted, and the cyclic utilization rate of the cooling medium is reduced; and the cooling medium is discharged by simply utilizing the gravity of the cooling medium in the cooling system, and the cooling medium is bound to remain on the wall of the cooling system; for the cooling medium remained on the wall, the inert gas at normal temperature is usually adopted to purge the cooling medium remained on the wall in the cooling system, however, because the diameters of the pipelines in the cooling system or the equipment are different, the difference exists, the purging and draining effects of the inert gas at normal temperature on the small pipe diameter are not obvious, and the cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline. In the prior art, although a cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline by adopting high-temperature inert gas for blowing, the technical problems can be solved, but in actual operation, the cooling medium with higher boiling point and difficult vaporization still remains on the wall of the cooling pipeline, so that the problem of whether the radioactive cooling medium in a cooling system, equipment and a pipeline is completely emptied is a serious test, and the problems of physical and mental health of workers and purity of a newly added cooling medium are concerned.
Disclosure of Invention
The present invention is directed to one or more of the problems in the prior art, and provides a drain drying system for a cooling system or equipment, which is designed to solve the technical problems set forth in the background art.
In one aspect of the invention, a drain drying system for a cooling system or apparatus is provided for a target station.
In another aspect of the present invention, a drain drying system for a cooling system or apparatus is provided, comprising: a medium automatic discharge system, a normal temperature nitrogen purging system, a high temperature nitrogen purging system and a vacuum-pumping drying system which are respectively communicated and connected with the cooling system.
Further, a cooling system pipeline through which a cooling medium circulates is arranged in the cooling system, and the medium automatic discharge system comprises a drain valve arranged on the cooling system pipeline and a storage tank arranged at the tail end of the cooling system pipeline.
Further, the storage tank is arranged below the cooling system pipeline.
Further, normal atmospheric temperature nitrogen gas purging system is including supplying nitrogen device, front end heater and being used for stablizing the buffer tank of atmospheric pressure, the buffer tank communicates with each other through nitrogen transmission pipeline and is connected between the nitrogen device with supplying, installs the front end heater on this nitrogen transmission pipeline, just the buffer tank communicates with each other through pipeline and cooling system and is connected.
Furthermore, the nitrogen supply device comprises at least one nitrogen cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer.
Further, the high-temperature nitrogen purging system comprises a rear-end heater, and the rear-end heater is installed on a pipeline between the buffer tank and the cooling system.
Further, the storage tank is communicated with a condenser.
Further, an exhaust dew point meter is arranged at the inlet of the liquid discharge pipe of the storage tank.
Further, the vacuumizing drying system comprises a vacuum pump and gas capturing cold trap equipment, the gas capturing cold trap equipment is communicated with the cooling system and the vacuum pump through vacuum hoses, and a condensation air inlet dew point instrument is arranged between the gas capturing cold trap equipment and the cooling system.
Furthermore, the gas capture cold trap device comprises a condensation shell and a liquid nitrogen tank assembly, the liquid nitrogen tank assembly is installed in the condensation shell, and a condensation inlet and a condensation outlet are formed in the upper portion of the condensation shell.
Furthermore, the condensation inlet is communicated and connected with the cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with the vacuum pump through the vacuum hose.
Furthermore, a liquid outlet is formed in the bottom of the condensation shell.
Further, the condensation air-intake dew-point instrument is arranged at a condensation inlet of the gas capture cold trap device.
Furthermore, a condensation outlet dew-point meter is arranged at a condensation outlet of the gas capture cold trap device.
The drainage drying system of the cooling system or the equipment provided by the invention has the following beneficial effects:
1. according to the medium autonomous discharging system, the drain valve and the storage tank are arranged below the cooling system, so that the problem of dry drain when the cooling system in the prior art is operated, overhauled and maintained in other emergency situations is solved, the radioactive gas is prevented from diffusing to a workplace, workers are prevented from being polluted by internal radiation and the workplace, and the concentration of the cooling medium and the purity of nitrogen gas filled during starting are ensured;
2. according to the normal-temperature nitrogen purging system, the nitrogen supply device, the front-end heater and the buffer tank are arranged at the front end of the cooling system, so that the problem that the cooling medium is always remained on the wall of the cooling system due to the fact that the existing cooling system is discharged by the gravity of the cooling medium is solved, the cooling medium remained on the wall of the cooling system is purged by the normal-temperature nitrogen and falls off, and is drained to the storage tank through the drain pipe, and the purpose of further reducing the content of the cooling medium in the cooling system is achieved;
3. according to the high-temperature nitrogen purging system, the rear-end heater is arranged on the basis of the normal-temperature nitrogen purging system, so that normal-temperature nitrogen is heated to 40-50 ℃, the cooling medium remained on the wall of the cooling pipeline is vaporized, the hot nitrogen carries gaseous cooling medium to be discharged into the storage tank for recycling, and the problem that the cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline due to the fact that the diameters of pipelines in the cooling system or equipment are different and have different effects and the effect of purging and draining small-diameter nitrogen is not obvious is solved;
4. according to the vacuum-pumping drying system, the tail end of the cooling system pipeline is provided with the gas capture cold trap device and the vacuum pump, and the hot nitrogen, the gaseous cooling medium and the cooling medium which has a high boiling point and is difficult to vaporize are still remained on the wall of the cooling system pipeline in a vacuum-pumping decompression mode, so that the problem that the cooling medium which has a high boiling point and is difficult to vaporize is still remained on the wall of the cooling system pipeline is solved, and the problem that other gaseous media exist in the cooling system pipeline is also solved;
5. the gas capture cold trap device has the functions of condensing and recycling the cooling medium, the arranged condensation air inlet dew point instrument can be used for determining the storage condition of the cooling medium in a cooling system, the device and a pipeline and the flow of introduced hot nitrogen, and the arranged condensation air outlet dew point instrument has the function of timely and efficiently capturing the gaseous cooling medium and is used for ensuring that no gaseous cooling medium exists at a condensation outlet so that only nitrogen is extracted from the condensation outlet.
Drawings
For a better understanding of the invention, embodiments thereof will be described with reference to the following drawings:
FIG. 1 is a flow diagram of a drain drying system of a cooling system or apparatus in an embodiment of the invention;
FIG. 2 is a flow chart of an autonomous media discharge system in an embodiment of the invention;
FIG. 3 is a flow chart of a normal temperature nitrogen purging system in an embodiment of the invention;
FIG. 4 is a flow diagram of a high temperature nitrogen purge system in an embodiment of the invention;
FIG. 5 is a flow chart of an evacuation drying system in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the front view structure of the gas trapping cold trap device in the vacuum drying system,
FIG. 7 isbase:Sub>A schematic perspective view of the structure of FIG. 6 at A-A;
FIG. 8 is a schematic perspective view of a liquid nitrogen tank assembly in the gas capture cold trap device;
wherein, in the figures, the respective reference numerals:
1-one-way valve, 2-drain valve, 3-exhaust dew point instrument, 4-condensation air inlet dew point instrument and 5-condensation air outlet dew point instrument;
10-a gas trap cold trap device;
11-condensation shell, 111-condensation inlet, 112-condensation outlet and 113-liquid outlet;
12-liquid nitrogen tank body assembly, 121-flange, 122-hollow cavity, 123-liquid nitrogen inlet, 124-nitrogen outlet and 125-installation cover plate.
Detailed Description
Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale. It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, there are no intervening elements present. Like reference numerals refer to like elements. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In view of the problems in the prior art, in one aspect of the present invention, a drain drying system for a cooling system or apparatus for a target station and a pipe communicating therewith is provided.
In another aspect of the present invention, as shown in fig. 1, there is provided a drain drying system of a cooling system or apparatus, comprising: the device comprises a medium automatic discharge system, a normal-temperature nitrogen purging system, a high-temperature nitrogen purging system and a vacuumizing and drying system, wherein the medium automatic discharge system, the normal-temperature nitrogen purging system, the high-temperature nitrogen purging system and the vacuumizing and drying system are respectively communicated and connected with a cooling system.
As shown in fig. 2, in the medium self-discharging system of the present embodiment, mainly for self-discharging the cooling medium that can flow in the cooling system, since the cooling medium used by the cooling system in the target station has a certain radioactivity, the residual amount of the cooling medium in the cooling system must be reduced as much as possible before each inspection. The medium self-draining system mainly drains the cooling medium in the cooling system by using gravity, and comprises a drain valve arranged on a pipeline of the cooling system and a storage tank arranged at the tail end of the pipeline of the cooling system, wherein a drain pipe is arranged on the storage tank and is communicated and connected with the tail end of the pipeline of the cooling system through the drain pipe, the storage tank is arranged below the pipeline of the cooling system, the drain valve is arranged between the cooling system and the storage tank, when the cooling system is stopped, the drain valve on the pipeline of the cooling system is opened, the flowable cooling medium remained in the cooling system is drained to the storage tank from the drain pipe by gravity drainage until the liquid level of the storage tank does not rise, and the condition is defined that the flowable cooling medium is drained automatically and the residual cooling medium adhered to the wall of the cooling system is remained.
In addition, the storage tanks are detachably arranged and have better replaceability, and one or more of the storage tanks are communicated through pipelines; when the storage tank is full, the storage tank can be detached and replaced at any time.
Of course, the medium self-draining system in the process of the embodiment is not limited to be used in the cooling system, and can also be used for equipment and pipelines communicated with the cooling system;
and, in the medium self-draining system in the process of the embodiment, a surge tank can be arranged between the drain valve and the storage tank to compensate the volume change of water caused by temperature change or surge in a cooling system, equipment and pipelines.
As shown in fig. 3, the normal-temperature nitrogen purging system according to this embodiment intervenes after the self-discharging system of the medium automatically discharges the flowable cooling medium by gravity, and mainly solves the problem of the liquid cooling medium remaining on the cooling system, the equipment, and the pipeline wall. The normal-temperature nitrogen purging system adopts normal-temperature nitrogen to purge cooling media remained on the walls of a cooling system, equipment and a pipeline, the normal-temperature nitrogen purging system is arranged at the front end of a medium automatic discharge system, the normal-temperature nitrogen purging system comprises a nitrogen supply device, a front-end heater and a buffer tank for stabilizing air pressure, the buffer tank is communicated and connected with the nitrogen supply device through a nitrogen transmission pipeline, the front-end heater is arranged on the nitrogen transmission pipeline between the nitrogen supply device and the buffer tank, the buffer tank is communicated and connected with the front end of the cooling system through a pipeline, a check valve is arranged on the pipeline between the buffer tank and the front end of the cooling system, and the nitrogen supply device comprises at least one nitrogen bottle group, a liquid nitrogen pump, a pressure reducing valve and a protective layer. Firstly, liquid nitrogen in a nitrogen bottle is output through a liquid nitrogen pump or other self-pressurization devices, the liquid nitrogen is decompressed through a decompression valve and then is transmitted to a front-end heater through a nitrogen transmission pipeline for heating, so that the liquid nitrogen is vaporized to nitrogen (10-15 Mpa), then the nitrogen enters a buffer tank through the nitrogen transmission pipeline, the buffer tank decompresses the passing nitrogen to a normal working range (0.05-0.4 Mpa), then the nitrogen is blown to a cooling system, equipment and pipelines by pressure difference in a segmented mode according to set flow, so that residual liquid cooling media on the wall are blown, blown or vaporized and dried by normal-temperature nitrogen, the blown and falling liquid cooling media are finally drained to a storage tank through a drain pipe until the liquid level of the storage tank does not rise any more, at the moment, the liquid cooling media remained on the wall are defined to be blown and blown by the normal-temperature nitrogen blowing system, the equipment and the pipeline, and the cooling media with stronger adhesive force still remain on the walls of the cooling system, the equipment and the pipeline.
As shown in fig. 4, in the high-temperature nitrogen purging system of this embodiment, after the normal-temperature nitrogen purging system finishes purging the cooling medium falling onto the residual wall, the normal-temperature nitrogen purging system intervenes, and mainly solves the problem that the cooling medium with stronger adhesive force still remains on the walls of the cooling system, the equipment, and the pipeline. Because the diameters of pipelines in a cooling system and equipment are different, the normal-temperature nitrogen has an unobvious blowing and draining effect on small pipe diameters, and a cooling medium with stronger adhesive force is still remained on the wall of the cooling pipeline. The high-temperature nitrogen purging system mainly adopts a method of purging a cooling medium with stronger adhesive force by hot nitrogen, and further comprises a rear-end heater, wherein the rear-end heater is arranged on a pipeline between a buffer tank and the front end of the cooling system (certainly comprising equipment and pipelines communicated and connected with the cooling system), is arranged at the front end of a one-way valve, and is communicated and connected with a condenser, when the liquid level of the storage tank does not rise after the storage tank is frequently purged and drained by Wen Danqi, the definition is that the liquid cooling medium remained on the wall is purged and completed by the normal-temperature nitrogen purging system, and at the moment, the high-temperature nitrogen purging system is started on the premise of keeping normal-temperature nitrogen normally output, and more specifically: the rear-end heater is started, nitrogen blown out from the buffer tank in a segmented mode according to a set flow is heated to 40-50 ℃, then hot nitrogen is blown into a cooling system, equipment and a pipeline by means of pressure difference, so that cooling media remained on the wall of the cooling pipeline are vaporized in an accelerated mode, the hot nitrogen carries gaseous cooling media, the hot nitrogen is discharged to the storage tank from the fluctuation box through a liquid discharge pipe of the cooling system, an exhaust dew point instrument is arranged at the inlet of the liquid discharge pipe of the storage tank, when the measured exhaust dew point temperature is lower than-20 ℃, the situation that the cooling media still remained on the wall of the cooling system, the equipment and the pipeline and having stronger adhesive force are blown by the hot nitrogen blowing system to complete hot nitrogen blowing is determined, in addition, the gaseous cooling media are discharged to a condenser from the storage tank to be condensed and recovered, and finally discharged to the high-efficiency filter system, and at the moment, the hot nitrogen, the gaseous cooling media and the cooling media with higher boiling points and difficult vaporization are still remained on the wall of the cooling system, the equipment and the pipeline.
The rear end heater in the process of the embodiment is an electric heater, and mainly comprises a heating pipe, a high-temperature flange and a wiring cavity, and the basic parameters are as follows: (1) design pressure: 1Mpa; (2) working pressure: 0.05-0.4 Mpa; (3) operating voltage: three phases of 380V; (4) power: 100KW; (5) surface heat load of the electric heating tube: 3W/cm2; (6) the design temperature is less than or equal to 200 ℃; (7) explosion-proof grade: exd II BT4; (8) the wiring cavity and the flange are made of materials: SS304, heating the tube shell material SS304.
As shown in fig. 5, in the vacuum-pumping drying system of this embodiment, the intervention is performed after the high-temperature nitrogen purging system finishes purging the cooling medium with the hot nitrogen, so that the problems that the hot nitrogen, the gaseous cooling medium and the cooling medium with a high boiling point and difficult vaporization still remain on the walls of the cooling system and the pipeline of the equipment are mainly solved. The vacuumizing drying system comprises a vacuum pump and a gas capturing cold trap device, wherein the gas capturing cold trap device is detachably arranged at the tail end of a pipeline of the cooling system, the gas capturing cold trap device is communicated and connected with the cooling system and the vacuum pump by vacuum hoses, a condensation air inlet dew point instrument is arranged between the gas capturing cold trap device and the cooling system, and when the vacuum degree of the cooling system is lower than 600Pa according to the data of a water three-phase diagram, the cooling medium remained in the cooling system absorbs heat and becomes solid, so that the vacuum degree of the cooling system, the equipment and the pipeline is higher than 600Pa, a hot nitrogen gas is required to be introduced to ensure that the vacuum degree of the cooling system is higher than 600Pa (as is easily understood by a person skilled in the art, after the high-temperature nitrogen purging system is stopped, the cooling system, the equipment and the pipeline wall of the equipment and the equipment are remained with the hot nitrogen, or the high-temperature nitrogen purging system is started to introduce the hot nitrogen to ensure that the vacuum degree of the cooling system is higher than 600Pa, the vacuum degree of the vacuum pump, the equipment and the pipeline are started to replace the residual nitrogen gas capturing medium which is in a boiling point is capable of being recovered and is reduced when the boiling point of the cooling system is reduced to 4 kkPa, or, the gas capturing cold trap equipment is communicated with one or more equipment through a pipeline, so that the recovery efficiency can be improved, in addition, when the dew point temperature measured by the condensation air inlet dew point instrument is lower than-20 ℃, the storage condition of the cooling medium in the cooling system, the equipment and the pipeline and the flow of the introduced hot nitrogen can be determined, so that the hot nitrogen still remained on the wall of the cooling system, the equipment and the pipeline, the gaseous cooling medium and the cooling medium with higher boiling point and difficult vaporization are completely extracted, and at the moment, a worker can overhaul, maintain or replace the cooling system with a new cooling medium.
In the vacuum-pumping drying system in the process of the embodiment, a drain valve is also installed between the gas capture cold trap device and the cooling system and between the gas capture cold trap device and the pipelines of the device, and is arranged at the front end of the condensation air inlet dew point instrument.
As shown in fig. 6 to 8, the gas capturing cold trap device in the process of this embodiment has the functions of condensing and recycling the cooling medium, and includes a condensing housing and a liquid nitrogen tank assembly, the liquid nitrogen tank assembly is detachably installed in the condensing housing, the upper portion of the condensing housing is provided with a condensing inlet and a condensing outlet for connecting the gas capturing cold trap device with a cooling system and a vacuum pump, the connection method is that the condensing inlet is connected with the cooling system through a vacuum hose, the condensing outlet is connected with the vacuum pump through a vacuum hose, and meanwhile, the bottom of the condensing housing is provided with a liquid discharge port for connecting a liquid discharge pipe with a collecting tank, so that the gas capturing cold trap device only needs to be heated, the solid cooling medium solidified in the gas capturing cold trap device is melted into a liquid cooling medium, and the liquid discharge port at the bottom of the condensing housing is discharged into the collecting tank through the liquid discharge pipe for recycling, the operation is simple and convenient, furthermore, the condensation air-in dew point instrument is arranged at the condensation inlet of the gas capture cold trap device, and is mainly used for determining the storage condition of cooling media in a cooling system, equipment and a pipeline, and certainly determining the flow of introduced hot nitrogen, in addition, the condensation outlet of the gas capture cold trap device is provided with the condensation air-out dew point instrument which has the function of efficiently capturing gaseous cooling media in time and is used for ensuring that the condensation outlet has no gaseous cooling media, so that only nitrogen is drawn out from the condensation outlet, if the condensation air-out dew point instrument captures the existence of the gaseous cooling media at the condensation outlet, the content of liquid nitrogen in the liquid nitrogen tank assembly is insufficient, the liquid nitrogen tank assembly needs to be detached for replacement, and certainly, a plurality of liquid nitrogen tank assemblies can be simultaneously arranged in a condensation shell, and the solidification efficiency of the gaseous cooling media can be improved, this liquid nitrogen tank body subassembly has better replaceability, and it includes hollow flange and a plurality of cavity of installing on the flange, and the cavity is used for filling the liquid nitrogen, and the refrigeration piece on this cavity adopts 1.5 x 10 x 420's 316L stainless steel sheet, and the cavity is that the welding mode (the welding trade mark is ER 308L) that adopts argon arc to weld welds in a flange side to seted up liquid nitrogen entry and nitrogen gas export, and another side integrated into one piece of flange has the installation apron, is used for seal installation in the top of condensation shell.
This liquid nitrogen tank body subassembly carries out pressure test: the shell side test pressure is 0.125Mpa, the tube side test pressure is 0.25Mpa, the test temperature is 5-25 ℃, the test procedure and the acceptance standard are executed according to GB150.4-2011 requirements, and the interior is dried by clean compressed air after the test is finished.
This liquid nitrogen tank body subassembly carries out gas tightness test: the shell pass gas tightness test is 0.1Mpa, the tube pass gas tightness test is 0.2Mpa, the meson is clean nitrogen, the test procedure and the acceptance standard are executed according to GB150.4-2011 requirements, and after the liquid nitrogen tank body assembly is manufactured, dirt is cleaned, oil is removed, and the surface (including welding seams) is subjected to acid pickling passivation treatment.
In the process of the embodiment, the nitrogen and the liquid nitrogen are not limited, and other inert element gases and liquid physical states thereof, such as helium, neon, argon, krypton, xenon and the like, can be adopted, so that the use of a gas source is effectively expanded, and the use requirements of different environments are met.
The invention has the beneficial effects that:
1. according to the medium autonomous discharging system, the drain valve and the storage tank are arranged below the cooling system, so that the problem of dry drain when the cooling system in the prior art is operated, overhauled and maintained in other emergency situations is solved, the radioactive gas is prevented from diffusing to a workplace, workers are prevented from being polluted by internal radiation and the workplace, and the concentration of the cooling medium and the purity of nitrogen gas filled during starting are ensured;
2. according to the normal-temperature nitrogen purging system, the nitrogen supply device, the front-end heater and the buffer tank are arranged at the front end of the cooling system, so that the problem that the cooling medium is always remained on the wall of the cooling system due to the fact that the existing cooling system is discharged by the gravity of the cooling medium is solved, the cooling medium remained on the wall of the cooling system is purged by the normal-temperature nitrogen and falls off, and is drained to the storage tank through the drain pipe, and the purpose of further reducing the content of the cooling medium in the cooling system is achieved;
3. according to the high-temperature nitrogen purging system, the rear-end heater is arranged on the basis of the normal-temperature nitrogen purging system, so that normal-temperature nitrogen is heated to 40-50 ℃, the cooling medium remained on the wall of the cooling pipeline is vaporized, the hot nitrogen carries gaseous cooling medium to be discharged into the storage tank for recycling, and the problem that the cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline due to the fact that the diameters of pipelines in the cooling system or equipment are different and have different effects and the effect of purging and draining small-diameter nitrogen is not obvious is solved;
4. according to the vacuum-pumping drying system, the tail end of the cooling system pipeline is provided with the gas capture cold trap device and the vacuum pump, and the hot nitrogen, the gaseous cooling medium and the cooling medium which has a high boiling point and is difficult to vaporize are still remained on the wall of the cooling system pipeline in a vacuum-pumping decompression mode, so that the problem that the cooling medium which has a high boiling point and is difficult to vaporize is still remained on the wall of the cooling system pipeline is solved, and the problem that other gaseous media exist in the cooling system pipeline is also solved;
5. the gas capture cold trap device has the functions of condensing and recycling the cooling medium, the arranged condensation air inlet dew point instrument can be used for determining the storage condition of the cooling medium in a cooling system, the device and a pipeline and the flow of introduced hot nitrogen, and the arranged condensation air outlet dew point instrument has the function of timely and efficiently capturing the gaseous cooling medium and is used for ensuring that no gaseous cooling medium exists at a condensation outlet so that only nitrogen is extracted from the condensation outlet.
The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (10)
1. A drain drying system for a cooling system or apparatus, characterized by: the drainage drying system of the cooling system or the equipment acts on the cooling system or the equipment of the target station; the drainage drying system of the cooling system or the equipment comprises a medium autonomous discharge system, a normal-temperature nitrogen purging system, a high-temperature nitrogen purging system and a vacuumizing drying system which are respectively communicated and connected with the cooling system.
2. The drain drying system of a cooling system or apparatus according to claim 1, wherein: the cooling system is internally provided with a cooling system pipeline through which a cooling medium circulates, and the medium self-draining system comprises a water draining valve arranged on the cooling system pipeline and a storage tank arranged at the tail end of the cooling system pipeline.
3. A drain drying system for a cooling system or apparatus according to claim 2, wherein: the storage tank is arranged below the pipeline of the cooling system.
4. A drain drying system for a cooling system or apparatus according to claim 2, wherein: the normal atmospheric temperature nitrogen gas purging system is including supplying nitrogen device, front end heater and being used for stabilizing the buffer tank of atmospheric pressure, the buffer tank communicates with each other through nitrogen transmission pipeline and is connected between the nitrogen device with supplying, installs the front end heater on this nitrogen transmission pipeline, just the buffer tank communicates with each other through pipeline and cooling system and is connected.
5. The drain drying system of a cooling system or apparatus according to claim 4, wherein: the nitrogen supply device comprises at least one nitrogen cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer.
6. The drain drying system of a cooling system or apparatus according to claim 1, wherein: the high-temperature nitrogen purging system comprises a rear-end heater, and the rear-end heater is installed on a pipeline between the buffer tank and the cooling system.
7. A drain drying system for a cooling system or apparatus according to claim 2 or 3, wherein: an exhaust dew point meter is arranged at the inlet of the liquid discharge pipe of the storage tank.
8. The drain drying system of a cooling system or apparatus according to claim 1, wherein: the vacuumizing drying system comprises a vacuum pump and gas capturing cold trap equipment, the gas capturing cold trap equipment is communicated with the cooling system and the vacuum pump through vacuum hoses, and a condensation air inlet dew point instrument is arranged between the gas capturing cold trap equipment and the cooling system.
9. The drain drying system of a cooling system or apparatus according to claim 8, wherein: the gas capture cold trap device comprises a condensation shell and a liquid nitrogen tank body assembly, wherein the liquid nitrogen tank body assembly is installed in the condensation shell, and a condensation inlet and a condensation outlet are formed in the upper portion of the condensation shell.
10. A drain drying system for a cooling system or apparatus according to claim 9, wherein: the condensation inlet is communicated and connected with the cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with the vacuum pump through the vacuum hose; and a liquid outlet is formed in the bottom of the condensation shell.
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| CN202211262536.1A CN115451646A (en) | 2022-10-14 | 2022-10-14 | Drainage drying system of cooling system or equipment |
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| CN202211262536.1A CN115451646A (en) | 2022-10-14 | 2022-10-14 | Drainage drying system of cooling system or equipment |
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