CN104370000A - Safe and environment-friendly method for protecting storage tanks - Google Patents
Safe and environment-friendly method for protecting storage tanks Download PDFInfo
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- CN104370000A CN104370000A CN201410613961.XA CN201410613961A CN104370000A CN 104370000 A CN104370000 A CN 104370000A CN 201410613961 A CN201410613961 A CN 201410613961A CN 104370000 A CN104370000 A CN 104370000A
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- gas
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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
- B65D88/02—Large containers rigid
- B65D88/04—Large containers rigid spherical
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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
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a safe and environment-friendly method for protecting storage tanks to mainly solve the problems that in the prior art, the gas consumption of nitrogen protection is excessively large, cost is high, and sulfur-containing gas and other peculiar smell gas are hard to treat. According to the safe and environment-friendly method for protecting the storage tanks, the gas produced by liquid in the storage tanks enters a compressor (18) through a main gas pipe (19) and an inflation pipe (21), the gas is pressurized by the compressor (18) and stored in a buffering tank (5) to serve as one part of positive-pressure protection gas, when the gas stored in the buffering tank (5) cannot meet the positive-pressure protection of all storage tanks, the nitrogen from a nitrogen inlet pipeline (22) is used for performing supplementation, and when the pressure stored in the buffering tank (5) exceeds the designed pressure, the residual gas is sent to a torch or combustion furnace through a torch or combustion furnace leading pipeline (22), the problems are well solved through the technical scheme, and the method can be used in storage tank protection.
Description
Technical field
The present invention relates to a kind of method protecting storage tank safety and environmental protection.
Background technology
In petroleum refining enterprise, sulfur-bearing oily sewage produces with producing, and need carry out storing with storage tank, oil separation and purifying treatment.At present, most of Water Tank, coke cooling water tank, alkaline residue tank etc. all adopt carbon steel manufacture.At tank level with upper part, in tank, acid gas contacts with tank skin, reacts, and generates ferrous sulphide.When in tank during charging, the above gaseous tension of tank level raises, and begins through breathing valve or water sealed tank discharges gas, and when in tank during discharging, the above gaseous tension of tank level lowers, and begins through breathing valve or water sealed tank inwardly sucks air.
When sucking air in tank, easily there is dieseling in the ferrous sulphide formed in tank, ignites the gas mixture in tank, cause the generation of storage tank fire explosion.As: 1997, certain company's air-lift device sulfur-bearing oily sewage tank was in pumping action, and in tank, liquid level declines, and has sucked air in tank, causes ferrous sulphide spontaneous combustion and the light oil that ignites in tank, causes fire.
For avoiding ferrous sulphide spontaneous combustion in tank, the most basic way stops air to enter storage tank.Method conventional at present has nitrogen protection, arranges input and output material interlocking, reduces operation fluctuation etc.Such as: on storage tank (mainly internal floating roof tank and arch-roof tank) top, nitrogen inlet is set, when tank internal pressure is lower than a certain value, nitrogen inlet valve open, nitrogen is supplemented in tank, nitrogen VOP, lower than breathing valve or water sealed tank response pressure, makes air can not enter in tank.To describe with nitrogen as positive pressure protection gas in document " storage tank nitrogen bind machine discard recycling technology " (Huang in pairs, " harbour handling ", 2003,6:38 ~ 39), make gas-phase space in tank keep anaerobic state, prevent ferrous sulphide spontaneous combustion.The capacity such as Water Tank conventional are at present 5000-10000 cubic meter, and therefore, adopt this kind of method comparatively large to the demand of nitrogen, the enterprise operating cost not plentiful to nitrogen is higher, by investigation, and the cost about 1 yuan of 1 cubic meter nitrogen in refinery.CN101417728A relates to the method for protecting storage tank safety by using sulfur recovery tail gas, describes the positive pressure protection gas adopting sulfur recovery facility tail gas as sulfur-bearing oily sewage tank, the discharge of sulfur-bearing oil tank, stops air in basin to enter.
In tank during charging, in tank, liquid level rises, and in tank, gaseous pressure raises, and the gas with foreign flavor such as sulfur-bearing are discharged by water sealed tank or breathing valve, and environmental pollution is larger.Deodorizing tank is installed after water sealed tank or breathing valve by some enterprise, removes acid gas, and this kind of method solves environmental issue to a certain extent, but also brings safety problem, and as 2005, Tahe refinery adopted solid adsorbent digester generation involuntary ignition accident.
Summary of the invention
The unmanageable problems of gas with foreign flavor such as technical matters to be solved by this invention is that in prior art, nitrogen protection gas consumption is excessive, the higher and sulfur-bearing of cost, provide a kind of method of protection storage tank safety and environmental protection newly.The method is used in the protection of storage tank, having nitrogen protection gas consumption little, the tractable advantages of gas with foreign flavor such as the lower and sulfur-bearing of cost.
For solving the problem, the technical solution used in the present invention is as follows: a kind of method protecting storage tank safety and environmental protection, the vapor delivery line of storage tank tank deck gathers becomes gas main (19), gas main (19) is connected with compressor (18) entrance by appendix (21), compressor (18) outlet is connected with expansion tank (5), expansion tank (5) is provided with at least two outlets, one is connected with gas main (19) by muffler (20), one is connected with reduce internal heat torch or incinerator pipeline (23), described expansion tank is provided with nitrogen inlet pipeline (22), every section of vapor delivery line is equipped with flame trap, the gas produced by liquid in storage tank self enters compressor (18) by gas main (19), appendix (21), gas passes through compressor (18) pressurized storage in expansion tank (5), as a part for positive pressure protection gas, when the gas stored in expansion tank (5) does not meet the positive pressure protection of each storage tank, the nitrogen from nitrogen inlet pipeline (22) is used to supplement, when expansion tank (5) internal pressure exceedes design pressure, send torch or burning by excessive gas by reduce internal heat torch or incinerator pipeline (23).
In technique scheme, preferably, the flame trap in described each vapor delivery line is arranged on the position near tank deck or tank body as far as possible.
In technique scheme, preferably, (5) are equipped with compression indicator for described storage tank, expansion tank.
In technique scheme, preferably, described muffler (20) is provided with reducing valve (17).
The present invention protects the method for storage tank safety and environmental protection to be that the gas boosting such as the sulfur-bearing produced by liquid in storage tank self are stored in expansion tank; as a part for positive pressure protection gas; when the gas stored in expansion tank does not meet the positive pressure protection of other tanks; use outside nitrogen to supplement, excessive gas will send torch to burn.Compared with prior art, decrease nitrogen use level during nitrogen-sealed, reduce productive costs, the gas making storage pot liquid self produce as far as possible is reused, unnecessary gas directly send torch or incinerator process, decrease gas processing flow process, decrease environmental pollution, achieve good technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the invention.
1 ~ 4 is storage tank; 5 is expansion tank; 6 ~ 10 is compression indicator; 11 ~ 16 is flame trap; 17 is reducing valve; 18 is compressor; 19 is gas main; 20 is muffler; 21 is appendix; 22 is nitrogen inlet pipeline; 23 is torch or the incinerator pipeline of reducing internal heat.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Detailed description of the invention
[embodiment 1]
The object of the invention is to utilize gas and the portion of external nitrogen protection storage tank safety such as the sulfur-bearing that in storage tank, liquid self produces, and excessive gas is sent to torch or incinerator process, reach the object of protection storage tank safety and environmental protection.
Flow graph schematic diagram of the present invention as shown in Figure 1, comprises the compression indicator (6,7,8,9,10) on four storage tanks (1,2,3,4), gas buffer tank (5), each tank, the flame trap (11,12,13,14,15,16) in each vapor delivery line, reducing valve (17), compressor (18), gas main (19).
Four storage tanks (1, 2, 3, 4) be connected by vapor delivery line with expansion tank (5), form gas main (19), the appendix (21) of gas main is connected with expansion tank (5) by compressor (18), the muffler (20) of gas main is connected with gas buffer tank (5) by reducing valve (17), expansion tank (5) and nitrogen inlet pipeline (22) with reduce internal heat torch or go incinerator pipeline (23) to be connected respectively, each vapor delivery line arranges flame trap (11, 12, 13, 14, 15, 16), flame trap is arranged on the position near tank body or tank deck as far as possible.
By storage tank charging and discharging, this working of an invention process is described.
When storage tank (1) starts charging or temperature rising, when causing the interior gaseous pressure of storage tank (1) to raise, in tank, first gas add to the lower storage tank of other pressure (2 by vapor delivery line (19), 3, 4) in, through after a while when each storage tank (1, 2, 3, 4, 5) when pressure mean values is higher than setting value 1.5kpa, compressor (18) between house steward and expansion tank is started working, gas boosting is stored in gas buffer tank (5), when each storage tank (1, 2, 3, 4) when pressure mean values drops to 0.1kpa, compressor (18) quits work.Along with the increase of expansion tank (5) interior gas, when expansion tank (5) reaches setting pressure 1.0Mpa, expansion tank (5) leads to the valve opening on torch or incinerator pipeline, unnecessary gas is sent to torch or incinerator burns.
When storage tank (1) starts blowing or temperature reduction, when causing gaseous pressure decline in tank, the storage tank (2 that other pressure are high, 3, 4) interior gas preferentially carries out make-up gas by gas main (19) to it, if the gas of other tank affluences can not meet requirements time, storage tank (1, 2, 3, 4) when pressure mean values is lower than 0kpa, reducing valve (17) valve opening on muffler (20) between expansion tank (5) and air lift house steward (19), pressure gas in expansion tank (5) starts to add to each storage tank (1, 2, 3, 4) in, make each storage tank (1, 2, 3, 4) internal pressure raises, when each tank (1, 2, 3, 4) when pressure is raised to 0.1kpa, reducing valve (17) in vapor return line is closed, expansion tank (5) stops to air feed in storage tank.When in expansion tank (5), gaseous tension reduces to 0.3kpa, valve opening on the nitrogen inlet pipeline (22) be connected with expansion tank (5), outside nitrogen adds to rapidly gas buffer tank, prevents tolerance in gas buffer tank not enough, causes storage tank to be taken out flat.
Claims (4)
1. protect the method for storage tank safety and environmental protection for one kind, the vapor delivery line of storage tank tank deck gathers becomes gas main (19), gas main (19) is connected with compressor (18) entrance by appendix (21), compressor (18) outlet is connected with expansion tank (5), expansion tank (5) is provided with at least two outlets, one is connected with gas main (19) by muffler (20), one is connected with reduce internal heat torch or incinerator pipeline (23), described expansion tank is provided with nitrogen inlet pipeline (22), every section of vapor delivery line is equipped with flame trap, the gas produced by liquid in storage tank self enters compressor (18) by gas main (19), appendix (21), gas passes through compressor (18) pressurized storage in expansion tank (5), as a part for positive pressure protection gas, when the gas stored in expansion tank (5) does not meet the positive pressure protection of each storage tank, the nitrogen from nitrogen inlet pipeline (22) is used to supplement, when expansion tank (5) internal pressure exceedes design pressure, torch or incinerator is sent to burn by reduce internal heat torch or incinerator pipeline (23) excessive gas.
2. protect the method for storage tank safety and environmental protection according to claim 1, it is characterized in that the flame trap in described each vapor delivery line is arranged on the position of close tank deck or tank body as far as possible.
3. protect the method for storage tank safety and environmental protection according to claim 1, it is characterized in that described storage tank, (5) are equipped with compression indicator with expansion tank.
4. protect the method for storage tank safety and environmental protection according to claim 1, it is characterized in that described muffler (20) is provided with reducing valve (17).
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| CN201410613961.XA CN104370000A (en) | 2014-11-04 | 2014-11-04 | Safe and environment-friendly method for protecting storage tanks |
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| CN201410613961.XA CN104370000A (en) | 2014-11-04 | 2014-11-04 | Safe and environment-friendly method for protecting storage tanks |
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| CN104828425A (en) * | 2015-05-29 | 2015-08-12 | 中国石油化工股份有限公司 | Method for avoiding gas phase burning explosion of an oil product storage tank |
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Application publication date: 20150225 |