CN104843360A - Nitrogen sealing device for storage tank and use method of nitrogen sealing device - Google Patents
Nitrogen sealing device for storage tank and use method of nitrogen sealing device Download PDFInfo
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- CN104843360A CN104843360A CN201510193989.7A CN201510193989A CN104843360A CN 104843360 A CN104843360 A CN 104843360A CN 201510193989 A CN201510193989 A CN 201510193989A CN 104843360 A CN104843360 A CN 104843360A
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- Prior art keywords
- storage tank
- nitrogen
- pressure
- inner floating
- floating roof
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
- B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
- B65D88/48—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with fluid means acting on the seal
Abstract
The invention relates to a nitrogen sealing device for a storage tank and a use method of the nitrogen sealing device. The nitrogen sealing device comprises the storage tank, a flow limiting porous plate bypass, a filter, an ordinary pneumatic adjusting valve, a valve locator, an intelligent controller, an intelligent pressure transducer, an inner floating top, a breathing valve, a flame-retardant device and an emergency pressure relief manhole. The inner floating top is located at the upper portion in the storage tank. The flow limiting porous plate bypass, the filter, the ordinary pneumatic adjusting valve, the valve locator, the intelligent controller and the intelligent pressure transducer are all arranged outside the inner floating top. The filter is arranged between a nitrogen inlet and the ordinary pneumatic adjusting valve. The flow limiting porous plate bypass is arranged between the filter and the inner floating top. The valve locator is connected with the ordinary pneumatic adjusting valve and the intelligent controller. The intelligent pressure transducer is connected with the intelligent controller and the inner floating top. The nitrogen sealing device has the advantages of being high in safety, long in service life, low in cost and the like.
Description
Technical field
The invention belongs to petrochemical complex oil storage and transportation field, relate generally to and need to suppress and the nitrogen-sealed system in the oil product storage process of contacting external air.
Background technology
According in petrochemical enterprise occupation health safety design regulation (SH3047-93), require to arrange nitrogen-sealed to the storage tank such as methyl alcohol, benzene.Nitrogen-sealed technology supplements the gas compartment in tank with nitrogen exactly, because nitrogen is lighter than oil vapour, so nitrogen floats over above oil vapour.Upon exhalation, outside exhalation tank is nitrogen instead of oil vapour, and when tank internal pressure reduces, nitrogen enters tank make-up gas space automatically, reduces evaporation loss, avoids oil product ingress of air to be oxidized.External major part adopts self-operated type nitrogen envelope valve as the core component of nitrogen envelope scheme.In self-operated type nitrogen envelope valve, so-calledly to rely on oneself, promote valve core movement by pressure itself exactly.If pressure itself is too little, there is no enough power to promote, realizing to force, then need doing special processing to nitrogen envelope valve.
At present, because domestic self-operated type nitrogen envelope valve market is little, manufacturer is less and service life is short; And the cost of external self-operated safety valve is higher, investment is too large, is not easy to be accepted by general user.Meaning of the present invention is the shortcoming solving this respect.
Summary of the invention
The object of the invention is to, overcome the defect that existing nitrogen seal device exists, and a kind of nitrogen seal device for storage tank and using method thereof are provided, technical matters to be solved is the long service life making nitrogen seal device, reduce costs, easily accepted by general user, thus be more suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of nitrogen seal device for storage tank that the present invention proposes, it is characterized in that comprising: storage tank (1), restriction orifice bypass (2), filter (3), conventional pneumatic control cock (4), valve positioner (5), intelligent controller (6), intelligent pressure transmitter (7), inner floating roof top (8), breathing valve (9), flame trap (10), emergency decompression manhole (11); Described inner floating roof top (8) is positioned at the top of storage tank (1), and described restriction orifice bypass (2), filter (3), conventional pneumatic control cock (4), valve positioner (5), intelligent controller (6) and intelligent pressure transmitter (7) are all arranged at outside inner floating roof top (8); Described filter (3) is located between nitrogen inlet (A) and conventional pneumatic control cock (4), and described nitrogen inlet (A) is connected with inner floating roof top (8) by conduit; Described restriction orifice bypass (2) is arranged between filter (3) and inner floating roof top (8); Described conventional pneumatic control cock (4) is positioned between restriction orifice bypass (2) two ends; Described valve positioner (5) connects conventional pneumatic control cock (4) and intelligent controller (6) respectively; Described intelligent pressure transmitter (7) connects intelligent controller (6) and inner floating roof top (8) respectively; Described breathing valve (9) connects inner floating roof top (8), and described flame trap (10) is arranged at the exit of described breathing valve (9); Described emergency decompression manhole (11) is arranged on inner floating roof top (8), and is connected with inner floating roof top (8).
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The aforesaid nitrogen seal device for storage tank, the pressure of wherein said intelligent controller (6), not higher than the pressure upper limit 2.0Kpa of storage tank (1), is not less than the pressure lower bound-0.5Kpa of storage tank (1).
The aforesaid nitrogen seal device for storage tank, the resistance drop of wherein said flame trap (10) is not more than 0.3KPa.
The object of the invention to solve the technical problems also realizes by the following technical solutions.The using method of a kind of nitrogen seal device for storage tank as described in aforementioned arbitrary claim proposed according to the present invention, normal pressure in described storage tank (1) is 1.1KPa, it is characterized in that: a, when the pressure in described storage tank (1) is higher than 1.1KPa, nitrogen gas supply line control cock (4) is closed, and stops nitrogen supply (NS); B, when the pressure in described storage tank (1) is lower than 1.1KPa, nitrogen gas supply line control cock (4) is opened, nitrogen is passed into from nitrogen inlet (A), ensure storage tank (1) not suck air in normal course of operation, the medium volatile fraction in storage tank (1) is hedged off from the outer world; C, when pressure-modulation valve need maintenance or fault time, restriction orifice bypass (2) is used to supplement nitrogen in described storage tank (1), when the pressure in described storage tank (1) is higher than 1.5KPa, by being with the outer denitrogen gas of breathing valve (9) of flame trap; When the pressure in described storage tank (1) is low to moderate-0.2pa, by being with the breathing valve (9) of flame trap to supplement air in the tank of described storage tank, guarantee that tank (1) interior pressure is not less than the design pressure lower bound-0.5Kpa of storage tank (1).D, when needs use restriction orifice bypass (2) supplement nitrogen time, flow equals oil product and goes out tank flow, and the caliber of nitrogen pipeline is DN50, and the operation pressure of nitrogen is 0.5MPa.
Preferably, above-mentioned storage tank (1) is internal floating roof tank or Dome roof tank, and the using method of this storage tank (1) is also applicable to the using method of internal floating roof tank or Dome roof tank.
By technique scheme, the present invention at least has following advantages:
Adopt invention can ensure safety in production.Owing to have employed nitrogen-sealed technology, in storage tank, the gas compartment is the miscellaneous gas of combustible liquid gas phase steam and nitrogen, reduce the concentration of fire gases, be in outside gas explosion limit scope, do not possess in tank occur combustion explosion condition and prevent material volatilize, oxidized, guarantee quality of material safety; Large and small breather loss can be reduced, increase economic efficiency.Because nitrogen is generally light than combustible liquid steam, float over above steam, mainly to breathe out when therefore exhaling outside tank nitrogen, during air-breathing, nitrogen can fill in tank automatically fast, improves tank internal pressure, effectively suppresses combustible liquid evaporation, thus greatly reduce large and small breather loss, increase economic efficiency; Adopt PLC or DSC automatically to control simultaneously, without the need to operating personal, stable and reliable operation, maintaining is convenient; Use core component is conventional pneumatic control cock, install and later maintenance cost is low, the life-span is long.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification sheets, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of internal floating roof tank of the present invention.
[main element nomenclature]
1: storage tank 2: restriction orifice bypass
3: filter 4: conventional pneumatic control cock
5: valve positioner 6: intelligent controller
7: intelligent pressure transmitter 8: inner floating roof top
9: breathing valve 10: flame trap
11: emergency decompression manhole A: nitrogen inlet
Detailed description of the invention
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to a kind of nitrogen seal device for storage tank its detailed description of the invention, structure, feature, using method and effect thereof of proposing according to the present invention, be described in detail as follows.
In order to realize object of the present invention, the present invention proposes following method of designing, transform example as with internal floating roof tank:
(1) vent of shutoff storage tank 1 tank skin (top).
(2) adjust tank deck breathing valve 9 and whether meet demand nitrogen being set and being honored as a queen.
(3) metered fuel orifice should add guide pipe, does not affect nitrogen seal pressure when guaranteeing gauging operation.
(4) storage tank 1 tank deck increases emergency decompression manhole 11 interface.
(5) nitrogen line increases filter 3.
(6) storage tank 1 tank deck arranges intelligent pressure transmitter 7, by chain on conventional pneumatic control cock 4 for the instruction of tank deck pressure, controls the suction quantity of nitrogen with conventional pneumatic control cock 4.
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the schematic flow sheet of internal floating roof tank of the present invention.As shown in Figure 1, at this only for internal floating roof tank, and Dome roof tank is herewith similar.
(1) every platform storage tank 1 arranges usual pressure control cock group and restriction orifice bypass 2, in maintenance tank, gas-phase space pressure is at about 1.1KPa, when gas-phase space pressure is higher than 1.1KPa, nitrogen gas supply line conventional pneumatic control cock 4 is closed, and stops nitrogen supply (NS); When gas-phase space pressure is lower than 1.1KPa, nitrogen gas supply line conventional pneumatic control cock 4 is opened, and starts supplementary nitrogen, ensures storage tank 1 not suck air in normal course of operation, medium volatile fraction in storage tank is hedged off from the outer world; When conventional pneumatic control cock 4 needs maintenance or fault, restriction orifice bypass 2 is used to supplement nitrogen in storage tank 1, when pressure is higher than 1.5KPa, by being with the outer row's (short time continuous supplementation nitrogen) of the breathing valve 9 of flame trap 10.
(2) can not close in time when conventional pneumatic control cock 4 accident is malfunctioning, when causing storage tank 1 tank internal pressure more than 1.5Kpa, by being with the outer row of the breathing valve 9 of flame trap 10; When conventional pneumatic control cock 4 accident is malfunctioning can not open in time time, when causing storage tank 1 tank internal pressure to be reduced to-0.2pa, by being with the breathing valve 9 of flame trap 10 to supplement air in tank, guarantee that storage tank 1 tank internal pressure is not less than the design pressure lower bound (-0.5Kpa) of storage tank.
(3) safety dumping under nitrogen envelope storage tank accident conditions is set for guaranteeing, emergency discharge manhole 11 should be set on storage tank 1, described emergency discharge manhole 11 level pressure should higher than the design pressure upper limit (2.0Kpa) of storage tank 1, should lower than the design pressure lower bound (-0.5Kpa) of storage tank 1.
(4) when needs use restriction orifice bypass 2 to supplement nitrogen, flow should equal oil product and go out tank flow, and the caliber of nitrogen pipeline is DN50, and the operating pressure of nitrogen is 0.5MPa.
(5) if be provided with gas phase unicom pipeline between identical oil product storage tank, every platform outlet all should arrange flame trap 10, to prevent fault spread.
(6) flame trap 10 should select the product that safety performance meets the demands, and resistance drop should not be greater than 0.3KPa.Emergency discharge manhole 11 illustrates: the general nitrogen pressure that supplies is 3 × 10
5~ 10 × 10
5between Pa, tank deck breathing valve 9 only plays safety effect, is malfunctioning at conventional pneumatic control cock 4, when causing storage tank 1 tank internal pressure too high or too low, plays safety effect, does not work under normal circumstances; Emergency discharge manhole 11 is arranged on tank deck, bore is general consistent with liquid feed valve bore, the pressure set-point of general emergency discharge manhole 11 slightly larger than the pressure set-point of conventional pneumatic control cock 4, so as not to for, let out nitrogen device frequent operation, waste nitrogen, affect service life of equipment.
Especially, the invention is not restricted to internal floating roof tank, the present invention is also applicable to Dome roof tank.
In sum, the power of usual pressure control cock 4 is simple, available purify air and light current as power resources, investment reduction cost; Usual pressure control cock 4 adopts setting control, and design value is 1.1KPa, also can set the pressure values of usual pressure control cock 4 according to the actual requirements, easy to use.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (4)
1. for a nitrogen seal device for storage tank, it is characterized in that comprising: storage tank (1), restriction orifice bypass (2), filter (3), conventional pneumatic control cock (4), valve positioner (5), intelligent controller (6), intelligent pressure transmitter (7), inner floating roof top (8), breathing valve (9), flame trap (10), emergency decompression manhole (11);
Described inner floating roof top (8) is positioned at the top of storage tank (1), and described restriction orifice bypass (2), filter (3), conventional pneumatic control cock (4), valve positioner (5), intelligent controller (6) and intelligent pressure transmitter (7) are all arranged at outside inner floating roof top (8);
Described filter (3) is located between nitrogen inlet (A) and conventional pneumatic control cock (4), and described nitrogen inlet (A) is connected with inner floating roof top (8) by conduit;
Described restriction orifice bypass (2) is arranged between filter (3) and inner floating roof top (8);
Described conventional pneumatic control cock (4) is positioned between restriction orifice bypass (2) two ends;
Described valve positioner (5) connects conventional pneumatic control cock (4) and intelligent controller (6) respectively;
Described intelligent pressure transmitter (7) connects intelligent controller (6) and inner floating roof top (8) respectively;
Described breathing valve (9) connects inner floating roof top (8), and described flame trap (10) is arranged at the exit of described breathing valve (9);
Described emergency decompression manhole (11) is arranged on inner floating roof top (8), and is connected with inner floating roof top (8).
2. the nitrogen seal device for storage tank according to claim 1, it is characterized in that: the pressure of described intelligent controller (6), not higher than the pressure upper limit 2.0Kpa of storage tank (1), is not less than the pressure lower bound-0.5Kpa of storage tank (1).
3. the nitrogen seal device for storage tank according to claim 1, is characterized in that: the resistance drop of described flame trap (10) is not more than 0.3KPa.
4. a using method for the nitrogen seal device for storage tank as described in claim arbitrary in claim 1-3, the normal pressure in described storage tank (1) is 1.1KPa, it is characterized in that:
A, when the pressure in described storage tank (1) is higher than 1.1KPa, nitrogen gas supply line control cock (4) close, stop nitrogen supply (NS);
B, when the pressure in described storage tank (1) is lower than 1.1KPa, nitrogen gas supply line control cock (4) is opened, nitrogen is passed into from nitrogen inlet (A), ensure storage tank (1) not suck air in normal course of operation, the medium volatile fraction in storage tank (1) is hedged off from the outer world;
C, when pressure-modulation valve need maintenance or fault time, restriction orifice bypass (2) is used to supplement nitrogen in described storage tank (1), when the pressure in described storage tank (1) is higher than 1.5KPa, by being with the outer denitrogen gas of breathing valve (9) of flame trap; When the pressure in described storage tank (1) is low to moderate-0.2pa, by being with the breathing valve (9) of flame trap to supplement air in the tank of described storage tank, guarantee that tank (1) interior pressure is not less than the design pressure lower bound-0.5Kpa of storage tank (1).
D, when needs use restriction orifice bypass (2) supplement nitrogen time, flow equals oil product and goes out tank flow, and the caliber of nitrogen pipeline is DN50, and the operation pressure of nitrogen is 0.5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510193989.7A CN104843360A (en) | 2015-04-21 | 2015-04-21 | Nitrogen sealing device for storage tank and use method of nitrogen sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510193989.7A CN104843360A (en) | 2015-04-21 | 2015-04-21 | Nitrogen sealing device for storage tank and use method of nitrogen sealing device |
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| Publication Number | Publication Date |
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| CN104843360A true CN104843360A (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510193989.7A Pending CN104843360A (en) | 2015-04-21 | 2015-04-21 | Nitrogen sealing device for storage tank and use method of nitrogen sealing device |
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| CN (1) | CN104843360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112623536A (en) * | 2020-12-25 | 2021-04-09 | 大连理工大学环境工程设计研究院有限公司 | Interlocking method for controlling pressure of storage tank |
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2015
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| CN102133982A (en) * | 2011-01-27 | 2011-07-27 | 陆春红 | Full-function metering and alarming system of oil tank |
| CN104267754A (en) * | 2014-09-24 | 2015-01-07 | 中国核动力研究设计院 | Intelligent reactor inlet pressure adjusting system and control method thereof |
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| CN112623536A (en) * | 2020-12-25 | 2021-04-09 | 大连理工大学环境工程设计研究院有限公司 | Interlocking method for controlling pressure of storage tank |
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Application publication date: 20150819 |