CN218833613U - Gas capture cold trap equipment - Google Patents

Abstract

The invention provides a gas capture cold trap device, which comprises a condensation shell and at least one liquid nitrogen tank body assembly, wherein the liquid nitrogen tank body assembly is arranged in the condensation shell, and the upper part of the condensation shell is provided with a condensation inlet and a condensation outlet; the condensation inlet is communicated and connected with a cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with a vacuum pump through the vacuum hose; a liquid outlet is formed in the bottom of the condensation shell; a condensation inlet dew point meter is arranged at the condensation inlet; and a condensation air outlet dew point instrument is arranged at the condensation outlet. The condensation air-in dew point instrument has the functions of condensing and recycling cooling media, can be used for determining the storage condition of the cooling media in a cooling system, equipment and a pipeline and the flow of introduced hot nitrogen, has the function of timely and efficiently capturing gaseous cooling media, and is used for ensuring that no gaseous cooling media exists at a condensation outlet and only nitrogen is extracted from the condensation outlet.

Description

Gas capture cold trap equipment

Technical Field

The invention relates to the technical field of condensers, in particular to a gas capture cold trap device 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.

The existing cooling system and equipment can purge the cooling system and equipment by using nitrogen with different temperatures when emptying liquid cooling media, the liquid cooling media can be completely emptied from the equipment, but the cooling media in the pipeline can be vaporized into gaseous cooling media, and the nitrogen and the gaseous cooling media can exist in the pipeline at the moment, so that the cooling system and the equipment are not pure, the purity of the newly added cooling media cannot be ensured, and in addition, if the cooling media have radioactivity, workers can be polluted by internal radiation and workplaces, so that the problem of whether the radioactive cooling media in the cooling system, the equipment and the pipeline are completely emptied is a serious test, and the problems of the physical and mental health of the workers and the purity of the newly added cooling media are concerned.

Disclosure of Invention

The invention provides a gas trapping cold trap device aiming at solving one or more problems in the prior art and aiming at solving the technical problems in the background technology.

The invention provides gas capture cold trap equipment which comprises a condensation shell and at least one liquid nitrogen tank body assembly, wherein the liquid nitrogen tank body assembly is arranged in the condensation shell, and a condensation inlet and a condensation outlet are formed in the upper part of the condensation shell.

Furthermore, the condensation inlet is communicated and connected with a cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with a vacuum pump through the vacuum hose.

Furthermore, a liquid outlet is formed in the bottom of the condensation shell.

Furthermore, a condensation inlet dew point meter is arranged at the condensation inlet.

Furthermore, a condensation air outlet dew point meter is arranged at the condensation outlet.

Further, the liquid nitrogen tank body assembly comprises a hollow flange and a plurality of hollow cavities mounted on the flange, and the hollow cavities are used for filling liquid nitrogen.

Furthermore, the refrigerating sheet on the hollow cavity is made of a 316L stainless steel sheet of 1.5X 10X 420.

Furthermore, the hollow cavity is provided with a liquid nitrogen inlet and a nitrogen outlet.

Furthermore, one side of the flange is welded with a hollow cavity in an argon arc welding mode, and the other side of the flange is integrally formed with an installation cover plate.

Further, the mounting cover plate is used for being hermetically mounted at the top of the condensation shell.

The invention provides a gas trapping cold trap device, which has the following beneficial effects:

the gas capturing cold trap device has the functions of condensing and recycling cooling media, the arranged condensation inlet dew point instrument can be used for determining the storage condition of the cooling media in a cooling system, the device and a pipeline and the flow of introduced hot nitrogen, and the arranged condensation outlet dew point instrument has the function of timely and efficiently capturing gaseous cooling media and is used for ensuring that no gaseous cooling media exist 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 schematic diagram of an elevational structure of a gas trap cold trap device in an evacuation drying system;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken at A-A in FIG. 1;

FIG. 3 is a schematic perspective view of a liquid nitrogen tank assembly in the gas capture cold trap device;

FIG. 4 is a flow diagram of an integrated drainage drying system in an embodiment of the present invention;

FIG. 5 is a flow chart of an autonomous media discharge system in an embodiment of the invention;

FIG. 6 is a flow chart of a normal temperature nitrogen purging system in an embodiment of the present disclosure;

FIG. 7 is a flow diagram of a high temperature nitrogen purge system in an embodiment of the invention;

FIG. 8 is a flow chart of an evacuation drying system in an embodiment of the present invention;

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 those 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.

As shown in fig. 1 to 3, the gas capture cold trap device provided by the present invention comprises a condensation housing and at least one liquid nitrogen tank assembly, wherein the liquid nitrogen tank assembly is installed in the condensation housing, and a condensation inlet and a condensation outlet are arranged at the upper part of the condensation housing; the condensation inlet is communicated and connected with a cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with a vacuum pump through the vacuum hose; a liquid outlet is formed in the bottom of the condensing shell; a condensation inlet dew point instrument is arranged at the condensation inlet; a condensation outlet dew point meter is arranged at the condensation outlet; the liquid nitrogen tank body assembly comprises a hollow flange and a plurality of hollow cavities arranged on the flange, and the hollow cavities are used for filling liquid nitrogen; the refrigerating sheet on the hollow cavity is a 316L stainless steel sheet with the thickness of 1.5 x 10 x 420; the hollow cavity is provided with a liquid nitrogen inlet and a nitrogen outlet; one side surface of the flange is welded with a hollow cavity in an argon arc welding mode, and the other side surface of the flange is integrally formed with an installation cover plate; the mounting cover plate is used for being hermetically mounted at the top of the condensation shell.

The working principle is explained by combining the drawings in detail:

referring to fig. 4, it should be noted that: the invention provides a gas capture cold trap device, which relates to the technical field of condensers and is used for a vacuumizing drying system in a water cooling system of a target station, wherein the cooling system is also communicated and connected with a medium autonomous discharge system, a normal-temperature nitrogen purging system and a high-temperature nitrogen purging system, so that the vacuumizing drying system, the medium autonomous discharge system, the normal-temperature nitrogen purging system and the high-temperature nitrogen purging system are combined into a comprehensive drainage drying system, and the main working steps are as follows:

referring to the medium self-discharging system of fig. 5, 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 of the process of this embodiment, a surge tank may also be installed between the drain valve and the storage tank to compensate for water volume changes in the cooling system, equipment, piping caused by temperature changes or surges.

Referring to the normal-temperature nitrogen purging system in fig. 6, the medium self-discharging system is involved after the gravity self-discharging of the flowable cooling medium is completed, 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 pipelines, the normal-temperature nitrogen purging system is arranged at the front end of a medium autonomous 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 one-way 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.

Referring to the high-temperature nitrogen purging system in fig. 7, after the normal-temperature nitrogen purging system finishes purging the cooling medium falling on the residual wall with the normal-temperature nitrogen, the intervention is performed, and the problem that the cooling medium with stronger adhesive force still remains on the walls of the cooling system, the equipment and the pipeline is mainly solved. 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 for purging a cooling medium with stronger adhesive force by hot nitrogen, and also 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 comprises equipment and a pipeline communicated and connected with the cooling system), and is arranged at the front end of a one-way valve, meanwhile, a storage tank is communicated and connected with a condenser, when the liquid level of the storage tank does not rise any more after the storage tank is frequently purged and drained by Wen Danqi, the liquid cooling medium remained on the wall is purged 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 output of the normal-temperature nitrogen, 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.

Referring to the vacuum-pumping drying system in fig. 8, the intervention is performed after the high-temperature nitrogen purging system finishes purging the cooling medium with the hot nitrogen, and mainly solves the problem that the hot nitrogen, the gaseous cooling medium and the cooling medium with a high boiling point and difficult vaporization still remain on the pipeline walls of the cooling system and the equipment. 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.

Referring to fig. 1 to 3, the gas capture cold trap device in the process of this embodiment has the functions of condensing and recycling 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 capture 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, a condensing outlet pipe 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 installing a liquid discharge pipe to be connected with a collecting tank, so that only the gas capture cold trap device needs to be heated, the solid cooling medium solidified in the gas capture 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 to be recycled, 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 jar body subassembly has better replaceability, and it includes hollow flange and a plurality of cavity cavitys of installing on the flange, and the cavity is used for packing the liquid nitrogen, and the refrigeration piece on this cavity adopts 1.5 10 to make up the stainless steel sheet of 316L of 420, and the cavity adopts argon arc welding's welding mode (the welding trade mark is ER 308L) to weld 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 condensation shell's top.

This liquid nitrogen tank body subassembly carries out pressure test: the shell pass test pressure is 0.125Mpa, the tube pass 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 air-tight 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 this embodiment, the nitrogen and the liquid nitrogen are not limited to be used, and other inert element gases and liquid physical states thereof, such as helium, neon, argon, krypton, xenon, and the like, may also be used, so as to effectively expand the use of gas sources and meet the use requirements of different environments.

The invention has the beneficial effects that:

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 gas capture cold trap device, characterized by: the gas capture cold trap device comprises a condensation shell and at least one liquid nitrogen tank body assembly, wherein the liquid nitrogen tank body assembly is arranged in the condensation shell, and a condensation inlet and a condensation outlet are formed in the upper portion of the condensation shell.

2. A gas capture cold trap device according to claim 1, wherein: the condensation inlet is communicated and connected with a cooling system through a vacuum hose, and the condensation outlet pipe is communicated and connected with a vacuum pump through the vacuum hose.

3. A gas capture cold trap device according to claim 1, wherein: and a liquid outlet is formed in the bottom of the condensation shell.

4. A gas capture cold trap device according to claim 1 or 2, wherein: and a condensation air inlet dew-point instrument is arranged at the condensation inlet.

5. A gas capture cold trap device according to claim 2, wherein: and a condensation air outlet dew point instrument is arranged at the condensation outlet.

6. A gas capture cold trap device according to claim 1, wherein: the liquid nitrogen tank body assembly comprises a hollow flange and a plurality of hollow cavities arranged on the flange, and the hollow cavities are used for filling liquid nitrogen.

7. A gas trap cold trap device according to claim 6, wherein: the refrigerating sheet on the hollow cavity adopts a 316L stainless steel sheet of 1.5X 10X 420.

8. A gas capture cold trap device according to claim 6, wherein: the hollow cavity is provided with a liquid nitrogen inlet and a nitrogen outlet.

9. A gas capture cold trap device according to claim 6, wherein: one side of the flange is welded with a hollow cavity in an argon arc welding mode, and the other side of the flange is integrally formed with an installation cover plate.

10. A gas capture cold trap device according to claim 9, wherein: the mounting cover plate is used for being mounted at the top of the condensation shell in a sealing mode.

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