CN215973243U - Nitrogen sealing system of liquid storage tank - Google Patents
Nitrogen sealing system of liquid storage tank Download PDFInfo
- Publication number
- CN215973243U CN215973243U CN202122450172.7U CN202122450172U CN215973243U CN 215973243 U CN215973243 U CN 215973243U CN 202122450172 U CN202122450172 U CN 202122450172U CN 215973243 U CN215973243 U CN 215973243U
- Authority
- CN
- China
- Prior art keywords
- storage tank
- pressure
- liquid
- mechanical
- reducing valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a nitrogen sealing system of a liquid storage tank, which comprises a mechanical pressure reducing valve, the storage tank and a liquid sealing tank, wherein an inlet of the mechanical pressure reducing valve is communicated with a nitrogen supply pipeline, and an outlet of the mechanical pressure reducing valve is communicated with the storage tank through a pipeline; the storage tank is provided with at least two mechanical breather valves with different pressure grades, and the storage tank is also provided with a pressure sensor and a pressure release valve; and a bypass pipeline is communicated with the pipeline between the mechanical pressure reducing valve and the storage tank and extends into the liquid seal tank. The pressure of the mechanical pressure reducing valve control system is maintained at micro-positive pressure, when the liquid or the pressure in the storage tank rises, the whole system can form a step layer protection, the pressure setting of the safety protection of each layer in the system is different, and the safety coefficient is higher.
Description
Technical Field
The utility model belongs to the technical field of liquid storage tank storage in petrochemical industry or grain and oil food industry, and particularly relates to a nitrogen sealing system of a liquid storage tank.
Background
While liquid product storage tanks are in storage tanks, if there is a safety or quality risk of the product coming into contact with air and oxygen, nitrogen sealing is required, and current nitrogen sealing systems are generally available in several ways: 1. directly and continuously injecting nitrogen into the top of the storage tank, and discharging while entering, so that the waste is large, and if the upstream is abnormal, the system is failed; 2. the mode of a breather valve is adopted, the pressure can be automatically released when the pressure is high or low, but the requirement of process safety cannot be met due to only one layer of safety protection, so that the possibility and the phenomenon of suction and choke or explosion of the storage tank are caused. The nitrogen sealing system of the storage tank is most afraid of the safety protection problem, and therefore, a solution for solving the technical problem is needed.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a nitrogen sealing system for a liquid storage tank, which solves the above problems of the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a nitrogen sealing system of a liquid storage tank comprises a mechanical pressure reducing valve, the storage tank and a liquid sealing tank, wherein an inlet of the mechanical pressure reducing valve is communicated with a nitrogen supply pipeline, and an outlet of the mechanical pressure reducing valve is communicated with the storage tank through a pipeline; the storage tank is provided with at least two mechanical breather valves with different pressure grades, and the storage tank is also provided with a pressure sensor and a pressure release valve; and a bypass pipeline is communicated with the pipeline between the mechanical pressure reducing valve and the storage tank and extends into the liquid seal tank.
It needs to be further explained that the storage tank is also connected with a liquid inlet pipeline used for conveying liquid in a co-production line.
It should be further noted that a liquid level sensor is further disposed on the storage tank.
Has the advantages that: the pressure of the mechanical pressure reducing valve control system is maintained at micro-positive pressure, when the liquid or the pressure in the storage tank is increased, redundant nitrogen can be discharged from a mechanical breather valve with lower pressure grade, when the liquid in the storage tank is pumped out, the nitrogen continuously enters the storage tank through the mechanical pressure reducing valve to maintain the pressure due to the reduction of the pressure of the system, and the system is in a normal working state; the safety protection of the system follows the foreign process safety management standard, except for a mechanical pressure reducing valve and a mechanical breather valve with smaller pressure grade, the other three layers of safety protection layers are arranged, when the mechanical breather valve with smaller pressure grade fails, the mechanical breather valve with larger pressure grade starts to work, when the mechanical breather valve with larger pressure grade also fails, the pressure of a pressure sensor of the system reaches a set value, the pressure release valve automatically opens to work, if the pressure release valve also fails, the last layer of liquid-sealed tank automatically starts, the storage tank is prevented from being expanded and exploded or sucked and held in the liquid storage process, meanwhile, air is effectively and continuously isolated, and the system is protected to work in a safe state all the time. The pressure setting of the safety protection of each layer in the system is different, so that the whole system can form a step-shaped layer-by-layer protection, and the safety factor is higher.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a mechanical pressure reducing valve; 2-a storage tank; 3-liquid sealing the tank; 4-nitrogen supply line; 5-a mechanical breather valve; 6-a pressure sensor; 7-a pressure relief valve; 8-liquid inlet pipeline.
Detailed Description
Example (b):
as shown in fig. 1, the present embodiment provides a nitrogen sealing system for a liquid storage tank, which includes a mechanical pressure reducing valve 1, a storage tank 2, and a liquid sealing tank 3, wherein an inlet of the mechanical pressure reducing valve 1 is communicated with a nitrogen gas supply pipeline 4, and an outlet of the mechanical pressure reducing valve 1 is communicated with the storage tank 2 through a pipeline; the storage tank 2 is provided with at least two mechanical breather valves 5 with different pressure grades, and the storage tank 2 is also provided with a pressure sensor 6 and a pressure release valve 7; and a bypass pipeline is communicated with the pipeline between the mechanical pressure reducing valve 1 and the storage tank 2 and extends into the liquid seal tank 3. When needing to be explained, the storage tank 2 is also connected with a liquid inlet pipeline 8 used for conveying liquid in a co-production line.
It should be noted that the devices used in this embodiment may be any existing devices, and are not limited to specific limitations, for example, the mechanical pressure reducing valve may be, but not limited to, a stainless steel diaphragm pressure reducing valve of model YZ110-B, and the liquid-tight tank may be, but not limited to, a liquid-tight tank of model PLAN 53A.
The working process is described as follows:
nitrogen gas from a nitrogen gas supply station is input into a mechanical pressure reducing valve 1 through a nitrogen gas supply pipe 4, the mechanical pressure reducing valve 1 reduces the output nitrogen gas to 5-7 mbar, the nitrogen gas enters storage tanks 2 through pipelines, each storage tank 2 is connected with two mechanical breather valves 5 with different pressure levels, a pressure sensor 6 and a pressure release valve 7, and meanwhile, a liquid seal tank 3 is connected through a bypass pipeline. The system controls the pressure of the system to be maintained at a slight positive pressure through the mechanical pressure reducing valve 1, when the liquid or the pressure in the storage tank 2 is increased, redundant nitrogen is discharged from the mechanical breather valve 5 with a smaller pressure grade, when the liquid in the storage tank is pumped out, the nitrogen continuously enters the storage tank through the mechanical pressure reducing valve 1 to maintain the pressure due to the reduction of the pressure of the system, and the system is in a normal working state; the safety protection of the system follows the foreign process safety management standard, except for a mechanical pressure reducing valve 1 and a mechanical breather valve 5 with a smaller pressure grade, the other three layers of safety protection layers are arranged, when the mechanical breather valve 5 with the smaller pressure grade fails, the mechanical breather valve 5 with the larger pressure grade starts to work, when the mechanical breather valve 5 with the larger pressure grade also fails, the pressure of a pressure sensor 6 of the system reaches a set value, a pressure release valve 7 automatically opens to work, if the pressure release valve 7 also fails, the last layer of liquid-sealed tank 3 automatically starts, the storage tank is prevented from being expanded or sucked and held in the liquid storage process, meanwhile, air is effectively and continuously isolated, and the system is protected to work in a safe state all the time. The pressure setting of the safety protection of each layer in the system is different, so that the whole system can form a step-shaped layer-by-layer protection, and the safety factor is higher.
In this embodiment, it should be further described that a liquid level sensor is further disposed on the storage tank 2, so that the liquid level change inside the storage tank 2 can be monitored in real time.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The nitrogen sealing system of the liquid storage tank is characterized by comprising a mechanical pressure reducing valve (1), a storage tank (2) and a liquid sealing tank (3), wherein an inlet of the mechanical pressure reducing valve (1) is communicated with a nitrogen supply pipeline (4), and an outlet of the mechanical pressure reducing valve (1) is communicated with the storage tank (2) through a pipeline; the storage tank (2) is provided with at least two mechanical breather valves (5) with different pressure grades, and the storage tank (2) is also provided with a pressure sensor (6) and a pressure release valve (7); and a bypass pipeline is communicated with a pipeline between the mechanical reducing valve (1) and the storage tank (2), and extends into the liquid seal tank (3).
2. Nitrogen sealing system for liquid storage tanks, according to claim 1, characterized in that the storage tank (2) is also connected with a liquid inlet pipe (8) for the liquid transported by the production line.
3. Nitrogen sealing system for liquid storage tanks according to claim 2, characterized in that a level sensor is also provided on the tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122450172.7U CN215973243U (en) | 2021-10-11 | 2021-10-11 | Nitrogen sealing system of liquid storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122450172.7U CN215973243U (en) | 2021-10-11 | 2021-10-11 | Nitrogen sealing system of liquid storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215973243U true CN215973243U (en) | 2022-03-08 |
Family
ID=80507671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122450172.7U Active CN215973243U (en) | 2021-10-11 | 2021-10-11 | Nitrogen sealing system of liquid storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215973243U (en) |
-
2021
- 2021-10-11 CN CN202122450172.7U patent/CN215973243U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215973243U (en) | Nitrogen sealing system of liquid storage tank | |
| CN105151582B (en) | Storage tank gas phase communication apparatus | |
| CN106870945B (en) | Natural gas pressure regulating skid-mounted device with multistage safety protection function | |
| CN109216732B (en) | High-pressure hydrogen supply system of hydrogen fuel cell ship | |
| CN204034106U (en) | Nuclear power station fire water distribution system | |
| CN116031591A (en) | Electrolyte supply control system | |
| CN113757100B (en) | Method and system for realizing sewage variable flow conveying by utilizing adjusting functions of automatic conveying pump and adjusting valve | |
| CN213744633U (en) | Hydraulic braking system of wind generating set | |
| CN206986975U (en) | A kind of high-building construction fire-fighting watering equipment | |
| CN208980266U (en) | A kind of novel rear turning type panel turnover machine hydraulic control system | |
| CN108224829B (en) | Liquid ammonia delivery system and liquid ammonia delivery method | |
| CN210372864U (en) | Nitrogen sealing system | |
| CN216113396U (en) | Recovery device for pressure relief and emptying of liquid nitrogen storage tank and nitrogen supply system | |
| CN104843360A (en) | Nitrogen sealing device for storage tank and use method of nitrogen sealing device | |
| CN221050580U (en) | Negative pressure damage protection device is prevented to normal pressure equipment and pipe-line system | |
| CN111059467A (en) | Chlorate decomposition gas pressure protection device | |
| CN110185934A (en) | A kind of fluid conveying pipe network automatic monitored control system | |
| CN213715782U (en) | Assembly for obtaining safe and stable low-pressure air source | |
| CN219493865U (en) | Hierarchical pressure relief device | |
| CN219140481U (en) | Liquid oxygen filling system | |
| CN212388667U (en) | Buffer device and liquid supply system | |
| CN209495130U (en) | A kind of main driving fuel tank compression system | |
| CN214552364U (en) | High-temperature organic waste gas treatment device | |
| CN208331775U (en) | Liquid nitrogen conveyance conduit pressure protective device | |
| CN216005668U (en) | Optical fiber coating system feeding device with rapid pressure relief function of transit barrel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |