CN104986464A - Organic alcohol storage tank protection method - Google Patents
Organic alcohol storage tank protection method Download PDFInfo
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- CN104986464A CN104986464A CN201510289642.2A CN201510289642A CN104986464A CN 104986464 A CN104986464 A CN 104986464A CN 201510289642 A CN201510289642 A CN 201510289642A CN 104986464 A CN104986464 A CN 104986464A
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- Prior art keywords
- storage tank
- pipeline
- nitrogen
- tank
- expansion tank
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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 an organic alcohol storage tank protection method, mainly solves problems in the prior art that nitrogen consumption is large, pollution is serve, the storage tank easily shrinks, and security is poor. The organic alcohol storage tank protection method is used. Tail gas pipelines on at least two storage tanks are connected with a main discharge pipeline. The outlet of the main discharge pipeline is connected with a buffer tank. The gaseous phase region of the buffer tank is provided with an oxygen content detector. The gaseous phase region is provided with a pipeline for supplementing nitrogen, and a regulating valve. According to detection data of the oxygen content detector, the regulating valve on the pipeline for supplementing nitrogen is adjusted. The top of the buffer tank is provided with a breather valve. The tail gas outlet of the breather valve is connected with an oil vapor recovery device. A tail gas pipeline of the storage tank is provided with a spark arrester. The upper part of the buffer tank is connected with a safe water seal through a pipeline. The technical scheme preferably solves the above problem, and can be used to prevent organic alcohol storage tanks.
Description
Technical field
The present invention relates to the guard method of a kind of organic alcohols storage tank.
Background technology
Organic alcohols storage tank gas phase is often in blast atmosphere, and in order to prevent organic alcohols storage tank gas phase from exploding, most actv. way is exactly the method adopting gas phase nitrogen protection, supplements nitrogen from storage tank breathing valve, and along with storage tank runs, nitrogen ceaselessly fills into and breathes out.This operation scheme is for the operation of whole tank field, and nitrogen use amount is huge, and the nitrogen of exhalation contains saturated organic volatile, and this will cause a large amount of nitrogen wastes, and increase enterprise operation cost, the tail gas simultaneously containing organic volatile is by contaminated environment.And once breathing valve et out of order, this runs causing the storage tank of whole tank field under the state of superpressure or negative pressure, very easily causes storage tank to be taken out the flat or breakage that builds the pressure.Once presence of fire, this certainly will increase the risk of flame propagation, fire spread.
CN201410613961 relates to a kind of method protecting storage tank safety and environmental protection, by adopting a kind of method protecting storage tank safety and environmental protection, the gas that liquid in storage tank self produces is passed through gas main, appendix enters compressor, gas is stored in expansion tank by compressor pressurizes, as a part for positive pressure protection gas, when the gas stored in expansion tank does not meet the positive pressure protection of each storage tank, the nitrogen from nitrogen inlet pipeline is used to supplement, when expansion tank internal pressure exceedes design pressure, torch or burning is sent by reduce internal heat torch or incinerator pipeline by excessive gas.CN201320356393 relates to a kind of nitrogen pressure control system for chemical drum, disclose a kind of nitrogen pressure control system for chemical drum, described system comprises the minute-pressure type sensor be arranged in storage tank, be arranged on the gulp valve that described storage tank upper end is connected with described storage tank, blow off valve, described gulp valve and check valve, filter, blowdown valve, pressure regulating valve is connected in series, described pressure regulating valve is connected with nitrogen pot, described minute-pressure type sensor according to the pressure in storage tank by signal transmission to PLC, the closure or openness of described PLC gulp valve and blow off valve according to received signal control.CN201120095334 relates to a kind of nitrogen protection device of atmospheric storage tank; comprise atmospheric storage tank; also comprise nitrogen storage tank and nitrogen sealed tube; atmospheric storage tank top is provided with pressure sensor; this pressure sensor is connected with the first electromagnetic valve and the second electromagnetic valve by controller, ensures the basicly stable of nitrogen in atmospheric storage tank.
Above-mentioned patent monitors nitrogen content by pressure sensor, and then control tonifying Qi and the exhaust of nitrogen, and pressure is maintained in the scope of setting.But whether storage tank is in gas phase blast atmosphere in fact only to rely on pressure accurately to ensure, high to the sealing requirements of storage tank itself, leaks, or for there is the storage tank of breathing valve, then there is certain potential safety hazard if occur.And only control to a certain extent, decrease nitrogen use level, still need to consume a large amount of pure nitrogen gas.
The present invention solves this problem targetedly.
Summary of the invention
Technical matters to be solved by this invention be in prior art nitrogen consumption comparatively large, pollute and more greatly, easily taken out flat, that safety is poor problem, a kind of new organic alcohols storage tank guard method is provided.The method is used in the protection of organic alcohols storage tank, has that nitrogen consumption is less, less pollution, is not easily taken out flat, the good advantage of safety.
For solving the problem, the technical solution used in the present invention is as follows: the guard method of a kind of organic alcohols storage tank, exhaust pipe at least two storage tanks is connected with total outfall pipeline, total outfall pipeline outlet is connected with expansion tank, the vapor phase areas of expansion tank arranges oxygen content detector, and the pipeline of supplementary nitrogen is set in described vapor phase areas and regulates the valves, regulate according to the detection data of oxygen content detector and supplement regulating the valves on nitrogen pipeline, when gas phase oxygen volume content in expansion tank higher than 9.0% time, regulate the valves described in opening and pass into nitrogen; When gas phase oxygen volume content in expansion tank lower than 9.0% time, the stopping that regulating the valves described in closedown passes into nitrogen, ensures that oxygen volume content in the gas phase of each storage tank is lower than 9.0%; Wherein, arrange breathing valve at expansion tank top, the breathing valve at expansion tank top is provided with air intake and offgas outlet, and described offgas outlet is connected with device for recovering oil and gas by pipeline, and device for recovering oil and gas top is provided with exhaust emissions pipeline; Exhaust pipe on described storage tank is provided with flame trap, and described expansion tank top is connected with Safety water seal by pipeline.
In technique scheme, preferably, regulating the valves as pneumatic valve on described supplementary nitrogen pipeline.
In technique scheme, preferably, described tank top does not arrange breathing valve.
In technique scheme, preferably, described organic alcohols is methyl alcohol, ethanol, propyl alcohol, butanols, isobutanol, tertiary butyl alchohol, isooctyl alcohol.
In technique scheme, preferably, the water column pressure scope that described Safety water seal is arranged is greater than more than 20% of breathing valve working pressure range.
In the present invention, the water column pressure scope that Safety water seal on expansion tank is arranged should higher than breathing valve working pressure range more than 20%, when breathing valve normally works, Safety water seal is guaranteed to close effectively, when breathing valve breaks down, can breathe out by breaking through Safety water seal or suck air in tank field, prevent storage tank from running under superpressure or negative pressure state.
Adopt method of the present invention, in the operational process of tank area, breathing valve cancelled by each storage tank, arrange exhaust pipe to be connected with total outfall pipeline, in total outfall pipeline outlet, expansion tank is set, expansion tank is arranged breathing valve, the nitrogen of band control cock makes up line, oxygen content detector, breathing valve still normally sucks exhalation air.The nitrogen pipeline by-pass valve control just passing into expansion tank detects data according to oxygen content in expansion tank and regulates.When saving nitrogen, prevent organic alcohols storage tank gas phase from firing.
This patent uses oxygen content detector, fires feature according to organic alcohols, adopts part nitrogen to mix with air, by accurately controlling gas phase oxygen volume content lower than setting value, just can reach the object preventing gas phase from firing, accomplishing essential safety.The storage tank exhaust emissions pipeline of tank field is coupled together simultaneously, eventually pass through an outlet uniform effluent, because each storage tank respiratory rate is different, can balance mutually between each storage tank gas phase.This will greatly reduce the use amount of nitrogen, reduce the discharge of tail gas, reach and prevent tank field from firing, the object of emissions reduction.The storage tank exhaust emissions pipeline of tank field is coupled together simultaneously, eventually pass through an outlet uniform effluent with device for recovering oil and gas, because each storage tank respiratory rate is different, can balance mutually between each storage tank gas phase, thus reduce evaporative emissions.Meanwhile, the exhaust pipe of storage tank arranges flame trap, effectively prevent fire-propagation.Expansion tank is connected with Safety water seal, avoids storage tank and is taken out flat danger, achieve good technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the invention.
1 is expansion tank; 2 is breathing valve; 3 for regulating the valves; 4 is oxygen content detector; 5 for supplementing nitrogen pipeline; 6 is air intake; 7 is the exhaust emissions pipeline on device for recovering oil and gas; 8 is data line; 9 is storage tank; 10 is total outfall pipeline; 11 is storage tank exhaust emissions pipeline; 12 is device for recovering oil and gas; 13 is flame trap; 14 is Safety water seal.
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 guard method of a kind of organic alcohols storage tank; the device adopted comprises two storage tanks (9), expansion tank (1), breathing valve (2), oxygen content detector (4), supplementary nitrogen pipeline (5), regulate the valves (3), and storage tank (9) top does not arrange breathing valve.The gas-phase space of two storage tanks (9) is all connected with total outfall pipeline (10) by exhaust pipe, total outfall pipeline (10) outlet is connected with expansion tank (1) top, breathing valve (2) one end at expansion tank (1) top is connected with the gas-phase space of expansion tank (1), oxygen content detector (4) is arranged on the gas-phase space of expansion tank (1), supplement nitrogen pipeline (5) to be connected with the gas-phase space of expansion tank (1), regulate the valves (3) be arranged on supplementary nitrogen pipeline (5), oxygen content detector (4) is connected with regulate the valves (3) by data line.Wherein, described storage tank does not arrange breathing valve, at expansion tank (1) top, breathing valve (2) is set, the breathing valve (2) at expansion tank (1) top is provided with air intake (6) and offgas outlet, described offgas outlet is connected with device for recovering oil and gas (12) by pipeline, and device for recovering oil and gas (12) top is provided with exhaust emissions pipeline (7).The exhaust pipe of each storage tank (9) is provided with flame trap (13), and the top of expansion tank (1) is connected with Safety water seal (14) by pipeline.The water column pressure scope that Safety water seal on expansion tank is arranged is higher than breathing valve working pressure range 20%, when breathing valve normally works, Safety water seal is guaranteed to close effectively, when breathing valve breaks down, can breathe out by breaking through Safety water seal or suck air in tank field, prevent storage tank from running under superpressure or negative pressure state.
In storage tank (9) operational process, the breathing valve (2) on expansion tank (1), according to discharging and feed needs, still normally to suck, air of breathing out.Just oxygen content detector (4) is set in expansion tank (1) gas phase, detects the change of gas phase oxygen content; Arrange supplementary nitrogen pipeline (5) at expansion tank top, this pipeline installs pneumatic adjusting valve door (3) additional, and this by-pass valve control detects data according to oxygen content in tank and regulates.When gas phase oxygen content in expansion tank higher than 9.0% time, automatically open valve and pass into nitrogen, until in expansion tank gas phase oxygen volume content lower than 9.0%; When gas phase oxygen volume content lower than 9.0% time, automatic-closing valve stop pass into nitrogen.By above control loop, ensure that the oxygen volume content of expansion tank gas phase is lower than 9.0%.When saving nitrogen, prevent organic alcohols storage tank gas phase from firing.Meanwhile, the offgas outlet of the breathing valve (2) on expansion tank is connected with device for recovering oil and gas (12) by pipeline, reclaims, decrease pollutant emission to volatile matter.
Adopting method of the present invention, comparing with using nitrogen protection storage tank completely, at least can save the nitrogen of 71.5%, and the safe effect reached is completely the same.If use pressure sensor to carry out the tonifying Qi of Monitoring and Controlling nitrogen compared with the situation of exhaust with other simultaneously, not only can save nitrogen, safety also improves greatly.Can reduce by the volatile matter volatilization of 95% simultaneously, and can fire-propagation be avoided, place building the pressure or being taken out flat of storage tank.
[embodiment 2]
According to the condition described in embodiment 1, just storage tank quantity is 3, at least can save the nitrogen of 81%, and the safe effect reached is completely the same.Can fire-propagation be avoided simultaneously, place building the pressure or being taken out flat of storage tank.
[embodiment 3]
According to the condition described in embodiment 1, just storage tank quantity is 4, at least can save the nitrogen of 85.8%, and the safe effect reached is completely the same.Can fire-propagation be avoided simultaneously, place building the pressure or being taken out flat of storage tank.
Claims (5)
1. organic alcohols storage tank guard method, exhaust pipe at least two storage tanks is connected with total outfall pipeline, total outfall pipeline outlet is connected with expansion tank, the vapor phase areas of expansion tank arranges oxygen content detector, and the pipeline of supplementary nitrogen is set in described vapor phase areas and regulates the valves, regulate according to the detection data of oxygen content detector and supplement regulating the valves on nitrogen pipeline, when gas phase oxygen volume content in expansion tank higher than 9.0% time, regulate the valves described in opening and pass into nitrogen; When gas phase oxygen volume content in expansion tank lower than 9.0% time, the stopping that regulating the valves described in closedown passes into nitrogen, ensures that oxygen volume content in the gas phase of each storage tank is lower than 9.0%; Wherein, arrange breathing valve at expansion tank top, the breathing valve at expansion tank top is provided with air intake and offgas outlet, and described offgas outlet is connected with device for recovering oil and gas by pipeline, and device for recovering oil and gas top is provided with exhaust emissions pipeline; Exhaust pipe on described storage tank is provided with flame trap, and described expansion tank top is connected with Safety water seal by pipeline.
2. organic alcohols storage tank guard method according to claim 1, is characterized in that regulating the valves as pneumatic valve on described supplementary nitrogen pipeline.
3. organic alcohols storage tank guard method according to claim 1, is characterized in that described tank top does not arrange breathing valve.
4. organic alcohols storage tank guard method according to claim 1, is characterized in that described organic alcohols is methyl alcohol, ethanol, propyl alcohol, butanols, isobutanol, tertiary butyl alchohol, isooctyl alcohol.
5. organic alcohols storage tank guard method according to claim 1, is characterized in that the water column pressure scope that described Safety water seal is arranged is greater than more than 20% of breathing valve working pressure range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289642.2A CN104986464A (en) | 2015-05-29 | 2015-05-29 | Organic alcohol storage tank protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289642.2A CN104986464A (en) | 2015-05-29 | 2015-05-29 | Organic alcohol storage tank protection method |
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| CN104986464A true CN104986464A (en) | 2015-10-21 |
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Citations (6)
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| CA2388651C (en) * | 1999-10-26 | 2008-10-07 | Csx Transportation, Inc. | Method and apparatus for locomotive fuel tank repair |
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| CN201660248U (en) * | 2009-12-30 | 2010-12-01 | 四川威特龙消防设备有限公司 | Intrinsic safety inerting protection device for oil reservoir |
| CN103723396A (en) * | 2013-10-18 | 2014-04-16 | 中国石油化工股份有限公司 | Storage tank area integrated breathing apparatus |
| CN104370000A (en) * | 2014-11-04 | 2015-02-25 | 中国石油化工股份有限公司 | Safe and environment-friendly method for protecting storage tanks |
| CN104495125A (en) * | 2014-12-24 | 2015-04-08 | 四川威特龙消防设备有限公司 | Oil product storage tank safety protection device and protection method |
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2015
- 2015-05-29 CN CN201510289642.2A patent/CN104986464A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2388651C (en) * | 1999-10-26 | 2008-10-07 | Csx Transportation, Inc. | Method and apparatus for locomotive fuel tank repair |
| CN201660248U (en) * | 2009-12-30 | 2010-12-01 | 四川威特龙消防设备有限公司 | Intrinsic safety inerting protection device for oil reservoir |
| CN101767697A (en) * | 2009-12-31 | 2010-07-07 | 杜扬 | Intrinsically safe inerting protection method and device for oil storage tank |
| CN103723396A (en) * | 2013-10-18 | 2014-04-16 | 中国石油化工股份有限公司 | Storage tank area integrated breathing apparatus |
| CN104370000A (en) * | 2014-11-04 | 2015-02-25 | 中国石油化工股份有限公司 | Safe and environment-friendly method for protecting storage tanks |
| CN104495125A (en) * | 2014-12-24 | 2015-04-08 | 四川威特龙消防设备有限公司 | Oil product storage tank safety protection device and protection method |
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| 孟庭宇等: "氮封内浮顶石脑油储罐气相空间气体浓度分布特性研究", 《化学工程与装备》 * |
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Application publication date: 20151021 |
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