CN219305097U - Normal temperature nitrogen purging system - Google Patents
Normal temperature nitrogen purging system Download PDFInfo
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- CN219305097U CN219305097U CN202222732379.8U CN202222732379U CN219305097U CN 219305097 U CN219305097 U CN 219305097U CN 202222732379 U CN202222732379 U CN 202222732379U CN 219305097 U CN219305097 U CN 219305097U
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Abstract
The utility model provides a normal-temperature nitrogen purging system, which is a cooling system or equipment for a target station; the normal-temperature nitrogen purging system is arranged at the front end of the cooling system, and the cooling system is provided with a cooling system pipeline through which a cooling medium flows; the normal temperature nitrogen purging system comprises a nitrogen supply device, a front-end heater and a buffer tank for stabilizing air pressure, wherein the buffer tank is communicated and connected with the front end of the cooling system through a pipeline, the buffer tank is communicated and connected with the nitrogen supply device through a nitrogen transmission pipeline, and the front-end heater is arranged on the nitrogen transmission pipeline. The utility model solves the problem that the existing cooling system simply utilizes the gravity of the cooling medium to discharge, so that the cooling medium can be remained on the wall of the cooling system, and the cooling medium remained on the wall of the cooling system is blown down by normal-temperature nitrogen and falls down to a storage tank by a liquid discharge pipe, thereby achieving the purpose of further reducing the content of the cooling medium discharged by the cooling system.
Description
Technical Field
The utility model relates to the technical field of target station cooling of spallation neutron sources, in particular to a normal-temperature nitrogen purging system for a target station water cooling system.
Background
In a target station water cooling system of a spallation neutron source, a working environment or a cooling medium adopted usually has certain radioactivity, and when the cooling system is required to be maintained in operation, overhaul and other emergency conditions, the cooling system needs to be vacuumized, so that the aim of avoiding the radioactive medium or gas from diffusing to a working place to cause the pollution of the working place by internal radiation and working personnel is fulfilled, and the concentration of the cooling agent and the purity of nitrogen filling during starting are ensured, so that the residual quantity of the cooling medium in the cooling system must be reduced as much as possible before each overhaul. However, at present, the cooling medium is discharged by simply utilizing the gravity of the cooling medium in the cooling system, and the cooling medium is necessarily remained on the wall of the cooling system, so that workers are easily polluted by internal radiation and workplaces.
Disclosure of Invention
The utility model aims at one or more problems in the prior art, and provides a normal-temperature nitrogen purging system, which aims at solving the technical problems in the background art.
The utility model provides a normal-temperature nitrogen purging system which is a cooling system or equipment for a target station.
Further, the normal temperature nitrogen purging system is arranged at the front end of the cooling system, and the cooling system is provided with a cooling system pipeline through which a cooling medium flows.
Further, the normal temperature nitrogen purging system comprises a nitrogen supply device, a front-end heater and a buffer tank for stabilizing air pressure, wherein the buffer tank is communicated and connected with the front end of the cooling system through a pipeline, the buffer tank is communicated and connected with the nitrogen supply device through a nitrogen transmission pipeline, and the front-end heater is arranged on the nitrogen transmission pipeline.
Further, the nitrogen supply device comprises at least one nitrogen cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer.
Further, a one-way valve is arranged on a pipeline between the buffer tank and the front end of the cooling system.
Furthermore, the cooling system is also communicated and connected with a medium autonomous discharging system, a high-temperature nitrogen purging system and a vacuumizing drying system.
The normal-temperature nitrogen purging system provided by the utility model has the following beneficial effects:
according to the normal-temperature nitrogen purging system, the front end of the cooling system is provided with the nitrogen supply device, the front-end heater and the buffer tank, so that the problem that the cooling medium is always remained on the wall of the cooling system by simply utilizing the gravity of the cooling medium in the conventional cooling system is solved, the cooling medium remained on the wall of the cooling system is purged and falls by normal-temperature nitrogen, and is drained to the storage tank through the liquid drain pipe, and the aim of further reducing the content of the cooling medium in the cooling system is fulfilled.
Drawings
For a better understanding of the present utility model, embodiments of the present utility model will be described with reference to the following drawings:
FIG. 1 is a flow chart of a medium autonomous discharge system in an embodiment of the utility model;
FIG. 2 is a flow chart of a normal temperature nitrogen purging system in an embodiment of the utility model;
FIG. 3 is a flow chart of a high temperature nitrogen purge system in an embodiment of the utility model;
FIG. 4 is a flow chart of an evacuation drying system according to an embodiment of the present utility model;
FIG. 5 is a flow chart of a combination of a normal temperature nitrogen purging system and a medium autonomous discharging system, a high temperature nitrogen purging system and a vacuum drying system to form a comprehensive drainage drying system in an embodiment of the utility model;
wherein, each reference sign in the figure:
1-check valve, 2-drain valve, 3-exhaust dew point meter, 4-condensation inlet dew point meter, 5-condensation outlet dew point meter.
Detailed Description
Specific embodiments of the utility model will be described in detail below, it being noted that the embodiments described herein are for illustration only and are not intended to limit the utility model. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the utility model. In other instances, well-known circuits, materials, or methods have not been described in detail in order not to obscure the utility model.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the utility model. 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. Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings 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 to" or "directly connected to" another element, there are no intervening elements present. Like reference numerals designate like elements. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 5, the present utility model provides a normal temperature nitrogen purging system, which is a cooling system or apparatus for a target station; the normal-temperature nitrogen purging system is arranged at the front end of the cooling system, and the cooling system is provided with a cooling system pipeline through which a cooling medium flows; the normal-temperature nitrogen purging system comprises a nitrogen supply device, a front-end heater and a buffer tank for stabilizing air pressure, wherein the buffer tank is communicated and connected with the front end of the cooling system through a pipeline, the buffer tank is communicated and connected with the nitrogen supply device through a nitrogen transmission pipeline, and the front-end heater is arranged on the nitrogen transmission pipeline; the nitrogen supply device comprises at least one nitrogen cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer; and a one-way valve is arranged on a pipeline between the buffer tank and the front end of the cooling system.
Furthermore, the cooling system is also connected with a medium autonomous discharging system, a high-temperature nitrogen purging system and a vacuum drying system in a communicating way, so that the normal-temperature nitrogen purging system, the medium autonomous discharging system, the high-temperature nitrogen purging system and the vacuum drying system are combined into the comprehensive drainage drying system.
The working principle is described with specific reference to the accompanying drawings:
referring to fig. 1, in the medium autonomous discharging system of the present embodiment, mainly for autonomously discharging a flowable cooling medium in a cooling system, since the cooling medium adopted in the cooling system in a 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 maintenance. The automatic medium draining system is one cooling system with gravity draining valve and one storing tank set in the end of the cooling system pipeline, with the storing tank being connected to the end of the cooling system pipeline via the draining pipe, the draining valve being set between the cooling system and the storing tank, and the draining valve being opened when the cooling system is stopped.
In addition, the storage tank is detachably arranged, has good replaceability, and is one or more than one storage tank which are communicated through pipelines; when the storage tank is full, it can be detached for replacement at any time.
Of course, the medium autonomous discharge system in the process of the embodiment is not limited to be used in a cooling system, and can be used for equipment and pipelines communicated with the cooling system;
and a fluctuation box can be arranged between the drain valve and the storage tank in the medium autonomous discharge system in the process of the embodiment to compensate the water volume change caused by temperature change or leakage in the cooling system, equipment and pipelines.
Referring to fig. 2, in the normal temperature nitrogen purging system of the present embodiment, intervention is performed after the medium autonomous discharging system completes gravity autonomous discharging of the flowable cooling medium, mainly to solve the problem of liquid cooling medium still remaining on the cooling system, equipment, and pipe walls. The normal temperature nitrogen purging system adopts normal temperature nitrogen to purge cooling medium 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 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 the 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 cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer. Firstly, liquid nitrogen in a nitrogen cylinder is output through a liquid nitrogen pump or other self-pressurizing devices, after the liquid nitrogen is depressurized through a depressurization valve, the liquid nitrogen is transmitted to a front-end heater through a nitrogen transmission pipeline to be heated, 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 depressurizes the passed nitrogen to a normal working range (0.05-0.4 Mpa), then the buffer tank is sectionally blown into a cooling system, equipment and a pipeline by means of pressure difference according to a set flow, so that residual liquid cooling medium on the wall is blown down or vaporized and dried by normal-temperature nitrogen, the blown-down liquid cooling medium is finally drained to a storage tank through a drain pipe until the liquid level of the storage tank is not risen, and at the moment, the liquid cooling medium which remains on the wall is defined as being completely blown by the normal-temperature nitrogen blowing system, but the cooling system, the equipment and the pipeline wall still remain cooling medium with stronger adhesive force.
Referring to fig. 3, in the high-temperature nitrogen purging system of the present embodiment, intervention is performed after the normal-temperature nitrogen purging system finishes normal-temperature nitrogen purging to cool the cooling medium on the residual wall, mainly to solve the problem that the cooling medium with stronger adhesion remains on the cooling system, the equipment and the pipeline wall. Because of different diameters of pipelines in a cooling system and equipment, the difference exists, and the purging and draining effects of normal-temperature nitrogen on small-diameter pipelines are not obvious, so that cooling mediums with stronger adhesive force still remain on the walls of the cooling pipelines. The high-temperature nitrogen purging system mainly adopts a method of purging 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 which are communicated with the cooling system), and is arranged at the front end of a one-way valve, meanwhile, a condenser is communicated and connected with a storage tank, when the liquid level of the storage tank is not raised after the storage tank is purged and discharged by normal temperature nitrogen, the liquid cooling medium remained on the wall is defined to be 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 normal temperature nitrogen, more specifically: the back-end heater is started, nitrogen gas blown out of the buffer tank in a sectionalized manner according to a set flow is heated to 40-50 ℃, hot nitrogen gas is blown into the cooling system, the equipment and the pipeline by means of pressure difference, so that cooling medium remained on the wall of the cooling pipeline is vaporized in an accelerating manner, the hot nitrogen gas carries gaseous cooling medium, the gaseous cooling medium is discharged to the storage tank through a liquid discharge pipe of the cooling system by the fluctuation box, an exhaust dew point meter is arranged at the inlet of the liquid discharge pipe of the storage tank, when the measured exhaust dew point temperature is less than-20 ℃, the cooling medium still remained on the wall of the cooling system, the equipment and the pipeline and having stronger adhesive force can be defined to be completely purged by the hot nitrogen gas by the hot nitrogen purging system, in addition, the gaseous cooling medium is discharged to the condenser by the storage tank for condensation recovery and finally discharged to the high-efficiency filter system, and at the moment, the hot nitrogen gas, the gaseous cooling medium and the cooling medium with higher boiling point and difficult vaporization are still remained on the wall of the cooling system.
Referring to fig. 4, in the vacuum drying system of the present embodiment, intervention is performed after the high-temperature nitrogen purging system finishes purging the cooling medium with hot nitrogen, the gaseous cooling medium and the cooling medium with a higher boiling point, which are difficult to vaporize, are remained on the pipeline walls of the cooling system and the equipment. The vacuumizing and drying system adopts a vacuumizing and depressurization mode to pump out hot nitrogen, gaseous cooling medium and cooling medium with higher boiling point and difficult to vaporize, the cooling system comprises a vacuum pump and a gas capture cold trap device, the gas capture cold trap device is detachably arranged at the tail end of a cooling system pipeline, the gas capture cold trap device is communicated with the cooling system and the vacuum pump by adopting vacuum hoses, meanwhile, a condensation air inlet dew point meter is arranged between the gas capture cold trap device and the cooling system, and when the vacuum degree of the cooling system is lower than 600Pa according to three-phase diagram data of water, the heat absorption of the cooling medium remained in the cooling system can be changed into solid state, so that the vacuum degree of the cooling system, the equipment and the pipeline is maintained to be higher than 600Pa, and the introduction of hot nitrogen is needed to ensure that the vacuum degree of the cooling system is higher than 600Pa (the vacuum degree of the cooling system is easy to understand by a person skilled in the art); after the high-temperature nitrogen purging system is stopped, hot nitrogen is remained on the walls of the cooling system, the equipment and the pipeline, 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 600 Pa), firstly, a vacuum pump is started to gradually vacuumize to 4 kPa-1 kPa, the principle is that the boiling point of water is reduced along with the pressure reduction, at the room temperature, the cooling medium with higher boiling point and difficult vaporization is in a boiling state, the cooling medium is pumped by a vacuum pump to purge, the hot nitrogen carries the cooling medium with dead angle to the gas capture cold trap equipment for recovery, the nitrogen is pumped out by the vacuum pump for discharge, the gaseous cooling medium is solidified into the solid cooling medium in the gas capture cold trap equipment, and when the gas capture cold trap equipment is full for recovery, the cooling medium can be detached for replacement at any time, so that the cooling system has better replaceability, alternatively, the gas trap cold trap device is one or more of the cold trap devices communicated through the pipeline, so that the recovery efficiency can be improved, in addition, when the dew point temperature measured by the condensation air inlet dew point meter is less than minus 20 ℃, the retention condition of the cooling medium in the cooling system, the device and the pipeline and the flow rate of the introduced hot nitrogen gas can be determined, so that the hot nitrogen gas still remained on the cooling system, the device and the pipeline wall, the gaseous cooling medium and the cooling medium with a higher boiling point and difficult to vaporize are all pumped out, and at the moment, the cooling system can be overhauled, maintained or replaced by a new cooling medium by staff.
In the vacuumizing and drying system in the process of the embodiment, a drain valve is also arranged 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 meter, and of course, when the vacuumizing and drying system in the process of the embodiment is in the middle, the drain valve is opened.
In the process of the embodiment, the method is not limited to the adopted nitrogen and liquid nitrogen, 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 an air source is effectively expanded, and the use requirements of different environments are met.
The beneficial effects of the utility model are as follows:
according to the normal-temperature nitrogen purging system, the front end of the cooling system is provided with the nitrogen supply device, the front-end heater and the buffer tank, so that the problem that the cooling medium is always remained on the wall of the cooling system by simply utilizing the gravity of the cooling medium in the conventional cooling system is solved, the cooling medium remained on the wall of the cooling system is purged and falls by normal-temperature nitrogen, and is drained to the storage tank through the liquid drain pipe, and the aim of further reducing the content of the cooling medium in the cooling system is fulfilled.
The foregoing examples are merely exemplary embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and that these obvious alternatives fall within the scope of the utility model.
Claims (4)
1. A normal temperature nitrogen purging system, its characterized in that: the normal-temperature nitrogen purging system is a cooling system or equipment for the target station; the normal-temperature nitrogen purging system is arranged at the front end of the cooling system, and the cooling system is provided with a cooling system pipeline through which a cooling medium flows; the normal temperature nitrogen purging system comprises a nitrogen supply device, a front-end heater and a buffer tank for stabilizing air pressure, wherein the buffer tank is communicated and connected with the front end of the cooling system through a pipeline, the buffer tank is communicated and connected with the nitrogen supply device through a nitrogen transmission pipeline, and the front-end heater is arranged on the nitrogen transmission pipeline.
2. A nitrogen purge system at ambient temperature as claimed in claim 1, wherein: the nitrogen supply device comprises at least one nitrogen cylinder group, a liquid nitrogen pump, a pressure reducing valve and a protective layer.
3. A nitrogen purge system at ambient temperature as claimed in claim 1, wherein: and a one-way valve is arranged on a pipeline between the buffer tank and the front end of the cooling system.
4. A nitrogen purge system at ambient temperature as claimed in claim 1, wherein: the cooling system is also communicated with a medium autonomous discharge system, a high-temperature nitrogen purging system and a vacuumizing drying system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222732379.8U CN219305097U (en) | 2022-10-14 | 2022-10-14 | Normal temperature nitrogen purging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222732379.8U CN219305097U (en) | 2022-10-14 | 2022-10-14 | Normal temperature nitrogen purging system |
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| Publication Number | Publication Date |
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| CN219305097U true CN219305097U (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222732379.8U Active CN219305097U (en) | 2022-10-14 | 2022-10-14 | Normal temperature nitrogen purging system |
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| CN (1) | CN219305097U (en) |
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- 2022-10-14 CN CN202222732379.8U patent/CN219305097U/en active Active
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