CN218915554U - Comprehensive drainage drying system - Google Patents
Comprehensive drainage drying system Download PDFInfo
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- CN218915554U CN218915554U CN202222721161.2U CN202222721161U CN218915554U CN 218915554 U CN218915554 U CN 218915554U CN 202222721161 U CN202222721161 U CN 202222721161U CN 218915554 U CN218915554 U CN 218915554U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model discloses an integrated drainage drying system, which acts on a cooling system or equipment of a target station, and the integrated drainage drying system comprises: the device comprises a medium autonomous discharge system, a normal-temperature nitrogen purging system, a high-temperature nitrogen purging system and a vacuumizing drying system; the medium autonomous discharging system, the normal-temperature nitrogen purging system, the high-temperature nitrogen purging system and the vacuumizing drying system are respectively communicated with the cooling system; a cooling system pipe through which a cooling medium flows is provided in the cooling system; the medium autonomous discharge system comprises a drain valve arranged on a cooling system pipeline and a storage tank arranged at the tail end of the cooling system pipeline, wherein the storage tank is arranged below the cooling system pipeline and is communicated with a condenser, and an exhaust dew point meter is arranged at the inlet of a liquid discharge pipe of the storage tank. The utility model solves the problem that the cooling system in the prior art can be subjected to drainage drying when in operation, maintenance and other emergency conditions need maintenance.
Description
Technical Field
The utility model relates to the technical field of target station cooling of spallation neutron sources, in particular to a comprehensive drainage drying system for a target station water cooling system or equipment.
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, the cooling medium of the existing cooling system is disposable, and the cooling medium is directly treated after the emission reduction is finished, so that the environment is polluted, and the recycling rate of the cooling medium is reduced; and the gravity of the cooling medium in the cooling system is simply utilized to discharge the cooling medium, and the cooling medium is necessarily remained on the wall of the cooling system; for the cooling medium remained on the wall, the inert gas at normal temperature is generally adopted to purge the cooling medium still remained on the wall in the cooling system, however, due to different diameters of pipelines in the cooling system or equipment, the inert gas at normal temperature has no obvious effect on purging and draining water with small pipe diameter, so that the cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline. In the prior art, although the cooling medium with stronger adhesive force still remains on the wall of the cooling pipeline by adopting high-temperature inert gas for purging, the cooling medium with higher boiling point and difficult vaporization still remains on the wall of the cooling pipeline in actual operation, so 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 physical and psychological health of workers and the purity of the newly added cooling medium are concerned.
Disclosure of Invention
The present utility model is directed to one or more problems of the prior art, and provides an integrated drainage and drying system, which aims to solve the technical problems set forth in the background art.
In one aspect of the utility model, an integrated drain drying system is provided for a cooling system or apparatus for a target station.
In another aspect of the utility model, an integrated drainage drying system is provided, which comprises a medium autonomous discharge system, a normal temperature nitrogen purging system, a high temperature nitrogen purging system and a vacuum drying system, wherein the medium autonomous discharge system, the normal temperature nitrogen purging system, the high temperature nitrogen purging system and the vacuum drying system are respectively connected with a cooling system in a communicating way, and a cooling system pipeline through which a cooling medium flows is arranged in the cooling system.
Further, the medium autonomous 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, and the storage tank is arranged below the cooling system pipeline.
Further, the storage tank is connected with a condenser in a communicating way, and an exhaust dew point instrument is arranged at the inlet of the liquid discharge pipe of the storage tank.
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 nitrogen supply device through a nitrogen transmission pipeline, the front end heater is arranged on the nitrogen transmission pipeline, and the buffer tank is communicated and connected with the cooling system through a pipeline.
Further, the high temperature nitrogen purging system comprises a back end heater which is arranged on a pipeline between the buffer tank and the cooling system
Furthermore, the vacuumizing and drying system comprises a vacuum pump and a gas capture cold trap device, wherein the gas capture cold trap device is communicated and connected with the cooling system and the vacuum pump through vacuum hoses, and a condensation air inlet dew point meter is arranged between the gas capture cold trap device and the cooling system.
Further, the gas capture cold trap device comprises a condensation shell and a liquid nitrogen tank body assembly, the liquid nitrogen tank body assembly is installed in the condensation shell, a condensation inlet and a condensation outlet are formed in the upper portion of the condensation shell, 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.
Further, the condensing inlet dew point meter is mounted at the condensing inlet of the gas capture cold trap apparatus.
Further, a condensation outlet dew point meter is arranged at the condensation outlet of the gas capture cold trap device.
The comprehensive drainage drying system provided by the utility model has the following beneficial effects:
1. according to the medium autonomous discharge system, the drain valve and the storage tank are arranged below the cooling system, so that the problem that the cooling system in the prior art is dry in drainage when in operation, overhaul and other emergency conditions need to be maintained is solved, 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 filled during starting are also ensured;
2. 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 per se in the existing 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;
3. according to the high-temperature nitrogen purging system, the rear-end heater is further arranged on the basis of the normal-temperature nitrogen purging system, so that normal-temperature nitrogen is heated to 40-50 ℃, vaporization of cooling medium remained on the wall of the cooling pipeline is realized, the hot nitrogen carries gaseous cooling medium to be discharged into the storage tank for recovery, and the problem that the cooling medium with stronger adhesive force remains on the wall of the cooling pipeline due to the fact that the purging drainage effect of the normal-temperature nitrogen on small pipe diameters is not obvious due to different and different pipeline diameters in the cooling system or equipment is solved;
4. according to the vacuumizing 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 vacuumizing depressurization mode is adopted to pump out the cooling medium which still remains hot nitrogen, gas and is difficult to vaporize and has higher boiling point on the wall of the cooling system pipeline, so that the problem that the cooling medium which remains higher boiling point and is difficult to vaporize is solved, and the problem that other gaseous mediums also exist in the cooling system pipeline is solved;
5. the gas capturing cold trap device has the functions of condensing and recycling cooling medium, the arranged condensing inlet dew point meter can be used for determining the retention condition of the cooling medium in a cooling system, the device and a pipeline and introducing the flow of hot nitrogen, and the arranged condensing outlet dew point meter has the function of capturing gaseous cooling medium timely and efficiently and is used for ensuring that a condensing outlet is free of the gaseous cooling medium, so that only the nitrogen is extracted from the condensing outlet.
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 an integrated drain drying system in an embodiment of the utility model;
FIG. 2 is a flow chart of a medium autonomous discharge system in an embodiment of the utility model;
FIG. 3 is a flow chart of a normal temperature nitrogen purging system in an embodiment of the utility model;
FIG. 4 is a flow chart of a high temperature nitrogen purge system in an embodiment of the utility model;
FIG. 5 is a flow chart of an evacuation drying system according to an embodiment of the present utility model;
figure 6 is a schematic diagram of the front view of the gas trapping cold trap apparatus in the vacuum drying system,
FIG. 7 isbase:Sub>A schematic diagram of the perspective structure at A-A in FIG. 6;
FIG. 8 is a schematic perspective view of a liquid nitrogen tank assembly in a gas trapping cold trap apparatus;
wherein, each reference sign in the figure:
1-one-way valve, 2-drain valve, 3-exhaust dew point meter, 4-condensing inlet dew point meter and 5-condensing outlet dew point meter;
10-a gas capture cold trap device;
11-condensing shell, 111-condensing inlet, 112-condensing outlet, 113-liquid outlet;
12-liquid nitrogen tank body assembly, 121-flange, 122-hollow cavity, 123-liquid nitrogen inlet, 124-nitrogen outlet and 125-mounting cover plate.
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.
In one aspect of the utility model, an integrated drain drying system is provided for a cooling system or apparatus for a target station and associated piping.
As shown in fig. 1, in another aspect of the present utility model, an integrated drainage drying system is provided, which includes a medium autonomous discharge system, a normal temperature nitrogen purge system, a high temperature nitrogen purge system, and a vacuum drying system, where the medium autonomous discharge system, the normal temperature nitrogen purge system, the high temperature nitrogen purge system, and the vacuum drying system are respectively connected to a cooling system in communication, and the cooling system is provided with a cooling system pipe through which a cooling medium circulates.
As shown in fig. 2, 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 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 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.
As shown in fig. 3, 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 the 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.
As shown in fig. 4, in the high-temperature nitrogen purging system of the embodiment, intervention is performed after the normal-temperature nitrogen purging system finishes normal-temperature nitrogen purging of the cooling medium on the residual wall, so that the problem that the cooling medium with stronger adhesive force still remains on the cooling system, equipment and pipeline wall is mainly solved. 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.
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 basic parameters of the electric heater are as follows: (1) design pressure: 1Mpa; (2) operating pressure: 0.05-0.4 Mpa; (3) operating voltage: three-phase 380V; (4) power: 100KW; (5) electric heating tube surface heat load: 3W/cm2; (6) the design temperature is less than or equal to 200 ℃; (7) explosion-proof rating: exdII BT4; (8) junction cavity and flange material: SS304, heating tube housing material SS304.
As shown in fig. 5, in the vacuum drying system of the embodiment, intervention is performed after the high-temperature nitrogen purging system finishes purging the cooling medium by hot nitrogen, so as to mainly solve the problem that hot nitrogen, gaseous cooling medium and cooling medium with higher boiling point and difficult vaporization remain 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.
As shown in fig. 6 to 8, the gas trap cold trap device in the process of this embodiment has the function of condensing and recovering the cooling medium, and comprises a condensing shell and a liquid nitrogen tank assembly, wherein the liquid nitrogen tank assembly is detachably arranged in the condensing shell, the upper part of the condensing shell is provided with a condensing inlet and a condensing outlet for connecting the gas trap cold trap device with a cooling system and a vacuum pump in a communicating way, the condensing inlet is connected with the cooling system in a communicating way through a vacuum hose, the condensing outlet is connected with the vacuum pump in a communicating way through a vacuum hose, meanwhile, the bottom of the condensing shell is provided with a liquid outlet for installing a liquid outlet pipe in a communicating way with a collecting tank, so that the solid cooling medium solidified in the gas trap cold trap device is melted into the liquid cooling medium only by heating the gas trap cold trap device, and is discharged into the collecting tank from the liquid outlet at the bottom of the condensing shell through the liquid outlet for recovery, the operation is simple and convenient, furthermore, the condensation inlet dew point meter is arranged at the condensation inlet of the gas capture cold trap device, is mainly used for determining the retention condition of the cooling medium in a cooling system, equipment and pipelines, and naturally also determines the flow of the introduced hot nitrogen, in addition, the condensation outlet of the gas capture cold trap device is provided with the condensation outlet dew point meter, has the function of timely and efficiently capturing the gaseous cooling medium, is used for ensuring that the condensation outlet is free of the gaseous cooling medium, ensures that the condensation outlet is only extracted with nitrogen, and if the condensation outlet is captured by the condensation outlet dew point meter, the defect that the content of the liquid nitrogen in the liquid nitrogen tank component is insufficient is indicated, and the liquid nitrogen tank component needs to be detached for replacement, and of course, the liquid nitrogen tank component can be installed in a plurality of condensation shells at the same time, thereby improving the solidification efficiency of the gaseous cooling medium, the liquid nitrogen tank body assembly has good replaceability and comprises a hollow flange and a plurality of hollow cavities arranged on the flange, wherein the hollow cavities are used for filling liquid nitrogen, a refrigerating sheet on the hollow cavities adopts a 316L stainless steel sheet of which the number is 1.5X10 x 420, the hollow cavities are welded on one side surface of the flange in an argon arc welding mode (the welding brand is ER 308L) and are provided with a liquid nitrogen inlet and a nitrogen outlet, and the other side surface of the flange is integrally formed with an installation cover plate which is used for being installed on the top of a condensation shell in a sealing mode.
The liquid nitrogen tank body component performs a 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 the requirements of GB150.4-2011, and the interior is blow-dried by clean compressed air after the test is finished.
The liquid nitrogen tank body component performs an air tightness test: the shell side air tightness test is 0.1Mpa, the tube side air tightness test is 0.2Mpa, the meson is clean nitrogen, the test procedure and the acceptance standard are executed according to the requirements of GB150.4-2011, and the liquid nitrogen tank body assembly is cleaned, degreased and the surface (including welding seams) is subjected to pickling passivation treatment after being manufactured.
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:
1. according to the medium autonomous discharge system, the drain valve and the storage tank are arranged below the cooling system, so that the problem that the cooling system in the prior art is dry in drainage when in operation, overhaul and other emergency conditions need to be maintained is solved, 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 filled during starting are also ensured;
2. 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 per se in the existing 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;
3. according to the high-temperature nitrogen purging system, the rear-end heater is further arranged on the basis of the normal-temperature nitrogen purging system, so that normal-temperature nitrogen is heated to 40-50 ℃, vaporization of cooling medium remained on the wall of the cooling pipeline is realized, the hot nitrogen carries gaseous cooling medium to be discharged into the storage tank for recovery, and the problem that the cooling medium with stronger adhesive force remains on the wall of the cooling pipeline due to the fact that the purging drainage effect of the normal-temperature nitrogen on small pipe diameters is not obvious due to different and different pipeline diameters in the cooling system or equipment is solved;
4. according to the vacuumizing 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 vacuumizing depressurization mode is adopted to pump out the cooling medium which still remains hot nitrogen, gas and is difficult to vaporize and has higher boiling point on the wall of the cooling system pipeline, so that the problem that the cooling medium which remains higher boiling point and is difficult to vaporize is solved, and the problem that other gaseous mediums also exist in the cooling system pipeline is solved;
5. the gas capturing cold trap device has the functions of condensing and recycling cooling medium, the arranged condensing inlet dew point meter can be used for determining the retention condition of the cooling medium in a cooling system, the device and a pipeline and introducing the flow of hot nitrogen, and the arranged condensing outlet dew point meter has the function of capturing gaseous cooling medium timely and efficiently and is used for ensuring that a condensing outlet is free of the gaseous cooling medium, so that only the nitrogen is extracted from the condensing outlet.
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 (9)
1. An integrated drainage drying system, characterized in that: the comprehensive drainage drying system comprises a medium autonomous discharge system, a normal-temperature nitrogen purging system, a high-temperature nitrogen purging system and a vacuumizing drying system, wherein the medium autonomous discharge system, the normal-temperature nitrogen purging system, the high-temperature nitrogen purging system and the vacuumizing drying system are respectively communicated and connected with a cooling system, and a cooling system pipeline through which a cooling medium circulates is arranged in the cooling system.
2. An integrated drainage drying system according to claim 1, wherein: the medium autonomous discharge system comprises a drain valve arranged on a cooling system pipeline and a storage tank arranged at the tail end of the cooling system pipeline, wherein the storage tank is arranged below the cooling system pipeline.
3. An integrated drainage drying system as claimed in claim 2, wherein: the storage tank is communicated and connected with a condenser, and an exhaust dew point meter is arranged at the inlet of the liquid discharge pipe of the storage tank.
4. An integrated drainage drying system according to claim 1, wherein: 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 nitrogen supply device through a nitrogen transmission pipeline, the front-end heater is arranged on the nitrogen transmission pipeline, and the buffer tank is communicated and connected with the cooling system through a pipeline.
5. An integrated drainage drying system according to claim 1, wherein: the high-temperature nitrogen purging system comprises a rear end heater which is arranged on a pipeline between the buffer tank and the cooling system.
6. An integrated drainage drying system according to claim 1, wherein: the vacuumizing and drying system comprises a vacuum pump and a gas capture cold trap device, wherein the gas capture cold trap device is communicated and connected with the cooling system and the vacuum pump through vacuum hoses, and a condensation air inlet dew point instrument is arranged between the gas capture cold trap device and the cooling system.
7. An integrated drainage drying system as claimed in claim 6, wherein: the gas capturing cold trap device comprises a condensation shell and a liquid nitrogen tank body assembly, the liquid nitrogen tank body assembly is installed in the condensation shell, a condensation inlet and a condensation outlet are formed in the upper portion of the condensation shell, 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.
8. An integrated drainage drying system as claimed in claim 6, wherein: the condensing inlet dew point meter is arranged at a condensing inlet of the gas capturing cold trap device.
9. An integrated drainage drying system as claimed in claim 7, wherein: and a condensation outlet dew point meter is arranged at a condensation outlet of the gas capture cold trap device.
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| CN202222721161.2U CN218915554U (en) | 2022-10-14 | 2022-10-14 | Comprehensive drainage drying system |
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2022
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