阅读说明：本技术 一种带有透气装置的船用放射性废水储存罐 (Marine radioactive wastewater storage tank with ventilation device ) 是由 贺军 韩想安 付云鹏 孙佳云 蔡报炜 彭磊 于 2020-06-10 设计创作，主要内容包括：本发明公开了一种带有透气装置的船用放射性废水储存罐,包括储存罐本体,储存罐本体的顶部还固定有主透气管路透气组件和辅助透气管路透气组件；主透气管路透气组件包括转运直通截止阀和可远程操作的遥控阀,储存罐本体顶部通过管路依次连接转运直通截止阀和遥控阀,遥控阀连接有透气兼溢流管；辅助透气管路透气组件包括储存直通截止阀和呼吸阀,储存罐本体顶部通过管路依次连接储存直通截止阀和呼吸阀。本发明采用非承压放射性废水储存罐,在常压储存的前提下,提高了收集罐接纳废水的容量,基本避免了放射性废气逸散至罐外的风险,同时保证了系统的正常稳定运行,提高了船舶总体资源利用率,降低了废水储运系统的造价。(The invention discloses a marine radioactive wastewater storage tank with a ventilation device, which comprises a storage tank body, wherein the top of the storage tank body is also fixedly provided with a main ventilation pipeline ventilation assembly and an auxiliary ventilation pipeline ventilation assembly; the main ventilation pipeline ventilation assembly comprises a transfer straight-through stop valve and a remote control valve capable of being operated remotely, the top of the storage tank body is sequentially connected with the transfer straight-through stop valve and the remote control valve through pipelines, and the remote control valve is connected with a ventilation and overflow pipe; supplementary ventilative subassembly of pipeline is including storing through stop valve and breather valve, and storage tank body top connects gradually through stop valve and breather valve through the pipeline. The invention adopts the non-pressure-bearing radioactive waste water storage tank, improves the waste water receiving capacity of the collection tank on the premise of normal pressure storage, basically avoids the risk of radioactive waste gas escaping to the outside of the tank, simultaneously ensures the normal and stable operation of the system, improves the utilization rate of the total resources of the ship, and reduces the manufacturing cost of the waste water storage and transportation system.)

1. A radioactive wastewater storage tank with a ventilation device for a ship comprises a storage tank body, wherein the top of the storage tank body is provided with a washing inlet and a wastewater inlet, and the bottom of the storage tank body is provided with a wastewater outlet; the main ventilation pipeline ventilation assembly comprises a transfer straight-through stop valve and a remote control valve capable of being operated remotely, the top of the storage tank body is sequentially connected with the transfer straight-through stop valve and the remote control valve through pipelines, and the remote control valve is connected with a ventilation and overflow pipe; supplementary ventilative subassembly of pipeline is including storing through stop valve and breather valve, and storage tank body top connects gradually through stop valve and breather valve through the pipeline.

2. The radioactive waste water storage tank for a ship having an air-permeable means according to claim 1, wherein the transfer through cut-off valve and the storage through cut-off valve are normally open.

3. The marine radioactive waste water storage tank with an air permeation mechanism according to claim 1, wherein the main air permeation pipeline air permeation assembly and the auxiliary air permeation pipeline air permeation assembly are provided in two sets, the interior of the marine radioactive waste water storage tank is divided into a front sheet body and a rear sheet body, and the front sheet body and the rear sheet body are provided with the main air permeation pipeline air permeation assembly, the auxiliary air permeation pipeline air permeation assembly, a flushing inlet, a waste water inlet and a waste water outlet; the front sheet body and the rear sheet body are connected through a communicating pipe (8).

4. The marine radioactive waste water storage tank with an air permeable means of claim 3, wherein the remote operated valves on the front body and the rear body are connected to a waste water transfer system, and an interlock is provided between the remote operated valves on the front body and the rear body.

5. A radioactive waste water storage tank for ships with air-breathing apparatus as claimed in claim 3, wherein said communicating pipe (8) is provided with an aerosol absorption filter (9).

6. A radioactive waste water storage tank for ships with air-permeable means according to claim 5, wherein the aerosol absorption filter (9) is externally provided with a detachable shielding layer.

7. The radioactive waste storage tank for ships having an air-permeable device according to claim 1, wherein the storage tank body is an unpressurized radioactive waste storage tank body.

8. The radioactive waste water storage tank for a ship having an air-permeable means according to claim 1,

in the transferring working condition, in the radioactive wastewater receiving and discharging process, the remote control valve on the main ventilation pipeline is opened to realize the transferring function; after the transfer work is finished, closing the remote control valve in time;

when the storage operating mode, close all remote control valves, through the breather valve, reduce this internal air of holding vessel and the contact of this external air of holding vessel.

9. The marine radioactive wastewater storage tank with the air-permeable device according to claim 1, wherein the breather valve comprises a valve body (401), a vacuum valve counterweight plate (408) and a vacuum valve disk (406) are arranged in the valve body (401), the vacuum valve counterweight plate (408) is arranged on the vacuum valve disk (406), the vacuum valve disk (406) is arranged on a vacuum valve seat (407), the vacuum valve seat (407) is arranged at the lower end of the valve body (401), the lower end of the valve body (401) is connected with a fireproof net bottom cover (405) through a fireproof net outer cover (404), a fireproof net (404) is arranged in the fireproof net outer cover (404), a push rod (402) is arranged in the middle of the fireproof net bottom cover (405), one end of the push rod (402) sequentially penetrates through the fireproof net bottom cover (405), the fireproof net weight (403) and the vacuum valve disk (407) and abuts against the vacuum valve disk (406), a pressure valve disk (409) is arranged right above the vacuum valve disk (408), pressure valve disk (409) are located on pressure valve seat (410), pressure valve seat (410) are located on valve body (401), be equipped with pressure valve counter weight (411) on pressure valve disk (409), valve body (401) and valve gap (415) fixed connection above it, in the cavity between valve body (401) and valve gap (415) is located in pressure valve counter weight (411), the upper end of pressure valve counter weight (411) and the one end fixed connection of lifter (419), the upper end and the lift handle (418) fixed connection of lifter (419) are passed to the other end of lifter (419).

10. The radioactive waste water storage tank for a ship having an air-permeable means according to claim 1, wherein a bushing (416) and an O-ring (417) are provided between the upper end of the valve cover (415) and the lift rod (419), and the O-ring (417) is provided between the bushing (416) and the lift rod (419).

Technical Field

The invention relates to a radioactive wastewater storage tank with a ventilation device for a ship, and belongs to the technical field of intersection of ship special system (equipment) design and nuclear engineering system design.

Background

With the diversification of ship functions, the design requirements for special systems of ships are higher and higher, and in recent years, nuclear power ships play an important role in the field of ships gradually by virtue of their advantages. The nuclear power plant has the requirement of discharging radioactive waste water, and the radioactive waste water belongs to dangerous liquid, has radioactive contamination, can not discharge at will, needs special wharf or boats and ships to guarantee.

The radioactive wastewater collection system mainly comprises two functions: the transfer working condition is mainly characterized in that the liquid level change is large, and the air pressure fluctuation in the waste water storage tank is large; storage operating mode, its key feature is the liquid level stability, but the free liquid level of jar radioactive waste water can fluctuate along with boats and ships motion production, and the change of the interior air volume of jar that leads to temperature variation in addition leads to jar interior air pressure to have slight fluctuation.

The existing ships with radioactive wastewater collection function mainly adopt a pressure-bearing type shielding container for collection, and the pressure bearing is generally required to be more than 0.5 MPa. The storage tank of radioactive waste water is generally up to 20m³Above, and need set up lead layer shielding, so to the production and the manufacturing of pressure-bearing formula shielded cell, its technology is complicated, and is bulky, and weight is heavy, and the cost is higher, and it is complicated to inspect, and also great to the consumption of boats and ships total resource. The radioactive wastewater is stored in the pressure-bearing type shielding container, mainly, the shielding container is sealed in order to avoid radioactive gas from being dissipated to other parts of a ship in the transferring and transporting process of a wastewater collecting system, so that the container needs to bear the strength safety under the design pressure. If the unpressurized radioactive wastewater storage tank is adopted, although the production and manufacturing process is simple, the volume is small, the weight is light, and the inspection is simple, the problems of design strength and sealing performance exist.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to make the radioactive wastewater storage tank meet the requirements of low manufacturing cost, simplified manufacturing process and inspection flow, high endurable strength and closed container at the same time.

In order to solve the technical problems, the technical scheme of the invention is to provide a radioactive wastewater storage tank with a ventilation device for a ship, which comprises a storage tank body, wherein the top of the storage tank body is provided with a flushing inlet and a wastewater inlet, and the bottom of the storage tank body is provided with a wastewater outlet; the main ventilation pipeline ventilation assembly comprises a transfer straight-through stop valve and a remote control valve capable of being operated remotely, the top of the storage tank body is sequentially connected with the transfer straight-through stop valve and the remote control valve through pipelines, and the remote control valve is connected with a ventilation and overflow pipe; supplementary ventilative subassembly of pipeline is including storing through stop valve and breather valve, and storage tank body top connects gradually through stop valve and breather valve through the pipeline.

Preferably, the transfer through stop valve and the storage through stop valve are both in a normally open state.

Preferably, the main ventilation pipeline ventilation assembly and the auxiliary ventilation pipeline ventilation assembly are respectively provided with two groups, the interior of the radioactive wastewater storage tank for the ship is divided into a front sheet body and a rear sheet body, and the front sheet body and the rear sheet body are respectively provided with the main ventilation pipeline ventilation assembly, the auxiliary ventilation pipeline ventilation assembly, a flushing inlet, a wastewater inlet and a wastewater outlet; the front sheet body and the rear sheet body are connected through a communicating pipe.

Preferably, the remote control valves on the front sheet body and the rear sheet body are connected with a wastewater transfer system, and the remote control valves on the front sheet body and the rear sheet body are interlocked.

Preferably, an aerosol adsorption filter is arranged on the communicating pipe.

Preferably, the aerosol absorption filter is externally coated with a detachable shielding layer.

Preferably, the storage tank body is an unpressurized radioactive wastewater storage tank body.

Preferably, in the transfer working condition, in the radioactive wastewater receiving and discharging process, the remote control valve on the main ventilation pipeline is opened to realize the transfer function; after the transfer work is finished, closing the remote control valve in time;

when the storage operating mode, close all remote control valves, through the breather valve, reduce this internal air of holding vessel and the contact of this external air of holding vessel.

Preferably, the breather valve comprises a valve body, a vacuum valve counterweight disc and a vacuum valve disc are arranged in the valve body, the vacuum valve counterweight disc is arranged on the vacuum valve disc, the vacuum valve disc is arranged on a vacuum valve seat, the vacuum valve seat is arranged at the lower end of the valve body, the lower end of the valve body is connected with a fireproof net bottom cover through a fireproof net outer cover, a fireproof net is arranged in the fireproof net outer cover, an ejector rod is arranged in the middle of the fireproof net bottom cover, one end of the ejector rod sequentially penetrates through the fireproof net bottom cover and the fireproof net, vacuum disk seat and top are equipped with the pressure valve disc directly over the vacuum valve counter weight disc, on the pressure valve seat was located to the pressure valve disc, on the valve body was located to the pressure valve seat, be equipped with the pressure valve counter weight on the pressure valve disc, the valve body and the valve gap fixed connection of its top, the cavity between valve body and the valve gap was located to the pressure valve counter weight, the upper end of pressure valve counter weight and the one end fixed connection of lift bar, the upper end and the lifting handle fixed connection of valve gap are passed to the other end of lift bar.

Preferably, a bushing and an O-shaped ring are arranged between the upper end of the valve cover and the lifting rod, and the O-shaped ring is arranged between the bushing and the lifting rod.

The invention adopts the non-pressure-bearing radioactive waste water storage tank, designs the ventilation device, improves the waste water receiving capacity of the collection tank on the premise of normal-pressure storage, basically avoids the risk of radioactive waste gas escaping to the outside of the tank, ensures the safe storage of dangerous liquid (such as radioactive waste water) on a ship, ensures the normal and stable operation of the system, improves the utilization rate of the overall resources of the ship, reduces the cost of a waste water storage and transportation system, is suitable for the radioactive waste water collection system for the ship, and can also provide reference for other dangerous liquid transportation systems.

The invention can ensure the normal operation and isolation safety of the system, can realize the special requirements of storage and transportation of the dangerous liquid on the ship, ensures that the system meets the functional requirements, ensures the strength safety and the sealing effectiveness of the tank body, and has high automation degree and simple and convenient operation.

The novel design of the double-ventilation pipeline and the communication short pipe is adopted, so that the requirements of the waste water storage tank on strength safety and sealing performance under different working conditions are met, the internal air of the waste water storage tank can be filtered and purified, the air quality of the waste water storage tank is optimized, and the waste water storage tank is convenient to maintain.

After the radioactive wastewater collection system is adopted, the non-pressure-resistant shielding tank can be adopted as the wastewater storage tank, so that the size and the weight of the whole system are effectively reduced, and the utilization rate of the ship cabin is improved; and simultaneously, the manufacturing cost of the waste water tank is also reduced. Through the means of interlocking control, can satisfy the management and control requirement of radioactive waste water, degree of automation is high, convenient operation, and is safe convenient.

The invention has the beneficial effects that:

1) by applying the ventilating device, the radioactive wastewater can be collected by using the non-pressure-resistant shielding tank, so that the basic functions of a wastewater transfer system are realized, and the strength safety and the shielding and isolating effectiveness of the wastewater tank are ensured;

2) compared with the traditional shielding pressure tank for storage, the ventilating device can effectively reduce the size of the shielding tank, reduce the weight and optimize the overall resource allocation of the ship;

3) the ventilation device can effectively treat and purify the ventilation quality, and basically avoids the risk of pollution of radioactive aerosol to the outside of the tank;

4) the complex manufacturing process and inspection flow of the shielded pressure vessel are avoided, and the manufacturing cost of the system is reduced;

5) the ventilating device can be operated remotely, has high automation degree, is safe and reliable and is convenient to operate;

6) the ventilation device can be extended to other ship dangerous goods liquid storage and transportation systems, and an idea is provided for the design scheme of the ventilation device.

Drawings

FIG. 1 is a schematic diagram illustrating the operation of a radioactive waste water storage tank with an air-permeable device for a ship according to the present invention;

FIG. 2 is a layout view of the installation position of the top of a radioactive wastewater storage tank for a ship with an air-permeable device according to the present invention;

fig. 3 is a schematic structural diagram of the breather valve.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The invention provides a radioactive wastewater storage tank with a ventilation device for a ship, wherein the ventilation device is applied to the radioactive wastewater storage tank, as shown in figure 1, the top of a storage tank body is provided with a flushing inlet and a wastewater inlet, the bottom of the storage tank body is provided with a wastewater outlet, the interior of the radioactive wastewater storage tank is divided into a front sheet body and a rear sheet body, and each sheet body can independently receive, store and discharge radioactive wastewater.

All install ventilative device on every lamellar body, ventilative device comprises two sets of independent ventilative subassemblies: one group is a main ventilation pipeline ventilation assembly used for executing the ventilation function under the transfer working condition, and comprises a 316L stainless steel pipe (main ventilation pipeline), a transfer through stop valve (a front sheet body transfer through stop valve 1 and a rear sheet body transfer through stop valve 15) and remote control valves (a front sheet body electrohydraulic remote control valve 2 and a rear sheet body electrohydraulic remote control valve 16. in the embodiment, the remote control valves are electrohydraulic remote control valves), the pipe diameter DN100 is generally equal to that the front sheet body transfer through stop valve 1 and the rear sheet body transfer through stop valve 15 are normally open, and the front sheet body electrohydraulic remote control valve 2 and the rear sheet body electrohydraulic remote control valve 16 are remotely controlled by a wastewater transfer system and are interlocked; the other group is an auxiliary ventilation pipeline ventilation assembly for executing the ventilation function under the storage working condition, and consists of a 316L stainless steel pipe (an auxiliary ventilation pipeline), a storage through stop valve (a front sheet body storage through stop valve 3 and a rear sheet body storage through stop valve 13) and a breather valve (a front sheet body breather valve 4 and a rear sheet body breather valve 14), wherein the pipe diameter DN80 is that the front sheet body storage through stop valve 3 and the rear sheet body storage through stop valve 13 are normally opened under the general condition. Set up the nozzle stub in the middle of two lamellar bodies and connect, material 316L, latus rectum DN100 to set up 1 filter (being aerosol adsorption filter 9), can adsorb the steam and the aerosol of filtering waste water transportation in-process loss in the air. Removable shielding is laid to the filter outside, and the material is 10mm stereotype +2mm stainless steel decorative board, convenient maintenance and change. If the installation space at the top is short, the aerosol adsorption filter 9 can be omitted, and the middle communicating pipe 8 is equivalent to a U-shaped pipe, so that a certain blocking effect is achieved, the water vapor component in the gas is reduced, and the effects of purification and ventilation are achieved. The communicating pipe 8 between preceding lamellar body and the back lamellar body can hinder the steam loss in the waste water transportation promptly.

When the main ventilation pipeline performs the function, air in one sheet body of the storage tank is discharged (sucked) out of the storage tank through the main ventilation pipeline from the communicating pipe 8 to the sheet body on the other side.

The inside of the radioactive wastewater storage tank for the ship is divided into a front piece body and a rear piece body, the front piece body is provided with a group of main ventilation pipeline ventilation assemblies (a front piece body transfer through stop valve 1 and a front piece body electrohydraulic remote control valve 2), a group of auxiliary ventilation pipeline ventilation assemblies (a front piece body storage through stop valve 3 and a front piece body breather valve 4), a front piece body flushing inlet 6, a front piece body wastewater inlet 7 and a front piece body wastewater outlet 10; a group of main ventilation pipeline ventilation components (a rear sheet body transfer through stop valve 15 and a rear sheet body electrohydraulic remote control valve 16), a group of auxiliary ventilation pipeline ventilation components (a rear sheet body storage through stop valve 13 and a rear sheet body breather valve 14), a rear sheet body flushing inlet 12, a rear sheet body waste water inlet 11 and a rear sheet body waste water outlet 18 are arranged on the rear sheet body. The front sheet body and the rear sheet body are connected through a communicating pipe 8.

In the transfer working condition, because the fluctuation of the waste water system is large, the aerosol in the waste water is easy to disperse in the air, but after passing through the communicating pipe 8 and the aerosol adsorption filter 9, the radioactive substances in the air in the tank can be effectively purified and reduced;

in the radioactive wastewater receiving and discharging process, the electro-hydraulic type remote control valve on the main ventilation pipeline is opened, the smoothness of the transferring process is ensured, and the transferring function is realized. Because the holding vessel does not bear pressure, ventilative and overflow pipe need satisfy the basic requirement of overflow pipe, 1.25 times pours into the pipe diameter into. Meanwhile, whether an after-treatment device needs to be arranged or not is determined according to the overall radiation protection management scheme of the ship and the design scheme of a radioactive wastewater system, and an aerosol adsorption filter 9 can be generally adopted. After the radioactive wastewater transfer work is finished, the electro-hydraulic type remote control valve on the main ventilation pipeline is operated in time, and the main ventilation pipeline is closed.

For the receiving and discharging working condition, the waste water receiving of the front sheet body of the waste water tank is taken as an example to be explained as follows: the back lamellar body electrohydraulic remote control valve 16 at the top of the back lamellar body of the waste water tank is opened in a remote control mode firstly, after 10s, a valve at the waste water inlet 7 of the front lamellar body of the waste water tank is opened in a remote control mode to execute a waste water receiving task, along with the rise of the liquid level in the front lamellar body of the waste water tank, the pressure of the air at the upper part of the liquid level is increased, the air in the tank is forced to flow into the middle communicating pipe 8, the aerosol in the air is adsorbed by the aerosol adsorption filter 9 and then enters the back lamellar body of the waste water tank, and the back lamellar body is transported by the back lamellar body of the main ventilation pipeline to. After the wastewater is received, the valve of the front piece body wastewater inlet 7 of the front piece body of the wastewater tank is closed in a remote control mode, and after 10 seconds, the rear piece body electrohydraulic remote control valve 16 at the top of the rear piece body of the wastewater tank is closed automatically. And finishing the execution of the task.

When the storage operating mode, only need with all remote control valves close can, utilize the pressure differential control function of preceding lamellar body breather valve 4 and back lamellar body breather valve 14, under the prerequisite of guaranteeing jar intensity safety, cut off jar interior air and outside contact. Because the free air in jar is few, the liquid level is stable, and aerosol content is low, along with waste water temperature reduces, under the effect of breather valve (the pressure valve can suitably be increaseed, nevertheless does not exceed jar body design intensity), jar internal air pressure can be a little less than jar outside, can avoid jar internal gas discharge jar possibility outside basically.

In the radioactive wastewater storage process, the main ventilation pipeline is closed, the breather valve of the auxiliary ventilation pipeline is opened, and the tightness and strength safety of the storage tank are ensured by the pressure difference balancing device (namely the normally open storage direct connection stop valve).

The two modes can be flexibly applied to other atypical working conditions such as flushing, no-load and the like, and the normal use of the system is guaranteed.

The operation and the conversion of the ventilating device are remote operations, the risk of entering an infected area is avoided, a one-key operation mode, namely a transfer mode and a storage mode, is arranged on the remote control cabinet, the corresponding control device can be opened by one key, manual intervention is not needed, the automation degree is high, the operation is simple and convenient, and the possibility of misoperation is avoided. Meanwhile, the monitoring system of the radioactive wastewater system pays attention to the liquid level and the pressure in the container in real time, and each valve can be operated independently under the emergency condition, so that the availability and the safety of the system are ensured.

As shown in fig. 2, the ventilation means is installed on the top plate of the storage tank body, disposed between the reinforcing ribs of the storage tank body. The main ventilation pipeline is connected by welding and is extended into a sewage well on the side surface of the storage tank body; the control valve of the auxiliary ventilation pipeline is directly welded between the reinforcing ribs of the top panel; the communicating pipe 8 is also welded, the length is about 1.5 m, the drift diameter and the main ventilation pipeline adopt the same caliber DN100, the wall thickness of the pipeline is the same as that of the main structure of the tank body, and a stainless steel pipeline with the thickness of 6mm is adopted.

The front piece electro-hydraulic remote control valve 2 is connected with a front piece ventilating and overflowing pipe, and the outlet of the front piece ventilating and overflowing pipe is a front piece ventilating and overflowing port 5; the rear-blade electrohydraulic remote control valve 16 is connected with a rear-blade ventilating and overflow pipe, and the outlet of the rear-blade ventilating and overflow pipe is a rear-blade ventilating and overflow port 17. The front sheet body storage ventilation port 19 is arranged on the front sheet body breather valve 4, and the rear sheet body storage ventilation port 20 is arranged on the rear sheet body breather valve 14.

As shown in fig. 3, the breather valve comprises a valve body 401, a vacuum valve counterweight disk 408 and a vacuum valve disk 406 are arranged in the valve body 401, the vacuum valve counterweight disk 408 is arranged on the vacuum valve disk 406, the vacuum valve disk 406 is arranged on a vacuum valve seat 407, the vacuum valve seat 407 is arranged at the lower end of the valve body 401, the lower end of the valve body 401 is connected with a fireproof net bottom cover 405 through a fireproof net outer cover 404, a fireproof net 403 is arranged in the fireproof net outer cover 404, a push rod 402 is arranged in the middle of the fireproof net bottom cover 405, one end of the push rod 402 sequentially penetrates through the fireproof net bottom cover 405, the fireproof net 403 and the vacuum valve seat 407 and abuts against the vacuum valve disk 406, a pressure valve disk 409 is arranged right above the vacuum valve counterweight disk 408, the pressure valve disk 409 is arranged on a pressure valve seat 410, the pressure valve seat 410 is arranged on the valve body 401, a pressure valve disk 411 is arranged on the pressure, a gasket 412 is arranged between the valve body 401 and the valve cover 415, the pressure valve counterweight 411 is arranged in a cavity between the valve body 401 and the valve cover 415, the upper end of the pressure valve counterweight 411 is fixedly connected with one end of a lifting rod 419, and the other end of the lifting rod 419 penetrates through the upper end of the valve cover 415 to be fixedly connected with a lifting handle 418.

A bushing 416 and an O-ring 417 are disposed between the upper end of the valve cover 415 and the lift rod 419, the O-ring 417 being disposed between the bushing 416 and the lift rod 419. The valve cover 415 is provided at its side with a label 421 for indicating the position of the lifting handle.

The lift handle position when the pressure disc is closed is shown at 422 in fig. 3 and the lift handle position when the pressure disc is open is shown at 423 in fig. 3.

The pressure difference device for ensuring the sealed storage safety of the waste water tank by the breather valve is mainly realized by the high-precision breather valve. The high-precision breather valve consists of a vacuum valve and a pressure valve, and the valve body is made of stainless steel 316L. According to the design pressure of the waste water tank applied to the device, the pressure is 40kpa, the opening pressure of the pressure valve is set to be 10kpa +/-10%, and the maximum working pressure is less than or equal to 21 kpa; the opening pressure of the vacuum valve is set to-5 kpa +/-20%, and the maximum working pressure is set to-7 kpa. Meanwhile, in the application scene of the invention, the breather valves in the two sheets can be mutually backed up, thereby improving the reliability of the ventilation system.

The invention develops and designs the ventilation system of the non-pressure-resistant radioactive wastewater storage tank, and controls the radioactive gas in the tank not to enter the cabin of the ship on the premise of ensuring the strength safety of the non-pressure-resistant tank. The size, the weight and the manufacturing cost of the radioactive wastewater storage tank can be effectively reduced through the application of the device.

The design of double ventilation pipelines is adopted: a main ventilation pipeline is adopted for working conditions such as transportation, flushing and the like; and the auxiliary ventilation pipeline is adopted to maintain the pressure in the wastewater tank under the working conditions of storage, no load and the like.

The pressure difference balancing device in the auxiliary ventilation pipeline adopts a breather valve design, the set pressure of the breather valve is adjusted according to the design pressure of the storage tank, and the requirements of the strength and the tightness of the storage tank are met.

When the ventilation pipeline of the internally-separated non-pressure-resistant tank is designed, short pipes which are communicated with each other can be arranged at the top end of the outer part of the tank body to open each independent area, and finally, a proper position is selected to be communicated with the outside of the tank for ventilation.

When the inside partitioned non-pressure-resistant tank ventilation pipeline is designed, the discharged air can be simply purified by adopting a communicating pipe design, or a processing device is added according to the situation, so that the quality of the discharged gas is optimized.