CN104986471A - Method for preventing gaseous phase propagation of fire in arene storage tank region - Google Patents
Method for preventing gaseous phase propagation of fire in arene storage tank region Download PDFInfo
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- CN104986471A CN104986471A CN201510289289.8A CN201510289289A CN104986471A CN 104986471 A CN104986471 A CN 104986471A CN 201510289289 A CN201510289289 A CN 201510289289A CN 104986471 A CN104986471 A CN 104986471A
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- nitrogen
- storage tank
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- gas phase
- pipeline
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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
- B65D90/48—Arrangements of indicating or measuring devices
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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 method for preventing gaseous phase propagation of fire in an arene storage tank region, and mainly solves problems in the prior art that nitrogen consumption is large and security is poor. The method for preventing gaseous phase propagation of fire in an arene storage tank region 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 storage 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. When the volume content of gaseous phase oxygen in the buffer tank is higher than 9.0%, the regulating valve is open to access nitrogen. When the volume content of gaseous phase oxygen in the buffer tank is lower than 9.0%, the regulating valve is shut off to stop accessing nitrogen, ensuring the volume content of oxygen in gas phase in each buffer tank is lower than 9.0%. The technical scheme preferably solves the above problem, and can be used to prevent gaseous phase propagation of fire in arene storage tank regions.
Description
Technical field
The present invention relates to a kind of method preventing aromatic hydrocarbons tank area fire gas phase from propagating.
Background technology
Aromatic hydrocarbons storage tank gas phase is often in blast atmosphere, and in order to prevent aromatic hydrocarbons 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 this will cause a large amount of nitrogen wastes.In order to save nitrogen, often adopt the operation scheme of storage tank gas phase UNICOM, 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.And there is the poor problem of safety.
The present invention solves the problems referred to above targetedly.
Summary of the invention
Technical matters to be solved by this invention is the problem that in prior art, nitrogen consumption is comparatively large, safety is poor, provides a kind of method preventing aromatic hydrocarbons tank area fire gas phase from propagating newly.During the method is used for preventing aromatic hydrocarbons tank area fire gas phase from propagating, there is the advantage that nitrogen consumption is less, safety is higher.
For solving the problem, the technical solution used in the present invention is as follows: a kind of method preventing aromatic hydrocarbons tank area fire gas phase from propagating, exhaust pipe at least two storage tanks is connected with total outfall pipeline, total outfall pipeline outlet is connected with expansion tank, at expansion tank top, breathing valve is set, the vapor phase areas of storage 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, described storage tank does not arrange breathing valve, the exhaust pipe on described each storage tank is provided with flame trap.
In technique scheme, preferably, regulating the valves as pneumatic valve on described supplementary nitrogen pipeline.
In technique scheme, preferably, described oxygen content detector is connected with regulating the valves by data line.
In technique scheme, preferably, described aromatic hydrocarbons is benzene,toluene,xylene, o-xylene, m-xylene, paraxylene, mixed benzene, ethylbenzene, more than C9 heavy aromatics.
The storage tank exhaust emissions pipeline of tank field couples together by this patent, eventually pass through an outlet uniform effluent, because each storage tank respiratory rate is different, can balance mutually between each storage tank gas phase, use oxygen content detector, fire feature according to aromatic hydrocarbons, part nitrogen is adopted to mix with air, by accurately controlling gas phase oxygen volume content lower than 9.0%, just can reach the object preventing gas phase from firing, accomplishing essential safety.This, by under the prerequisite of protection storage tank essential safety, greatly reduces the use amount of nitrogen.Meanwhile, each storage tank exhaust pipe installs flame trap additional, prevents flame transmission, 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 offgas outlet; 8 is data line; 9 is storage tank; 10 is total outfall pipeline; 11 is storage tank exhaust emissions pipeline; 12 is flame trap.
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]
A kind of method avoiding Storage Tanks Combustible Liquid gas phase to fire, for aromatic hydrocarbons storage tank, described aromatic hydrocarbons is benzene,toluene,xylene, o-xylene, m-xylene, paraxylene, mixed benzene, ethylbenzene, more than C9 heavy aromatics etc., device 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 emissions pipeline, 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), breathing valve (2) is provided with air intake (6) and offgas outlet (7), it is characterized in that 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.Exhaust pipe on described each storage tank is provided with flame trap.
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 aromatic hydrocarbons storage tank gas phase from firing and fire-propagation.
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.
[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.
[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.
Claims (4)
1. the method preventing aromatic hydrocarbons tank area fire gas phase from propagating, exhaust pipe at least two storage tanks is connected with total outfall pipeline, total outfall pipeline outlet is connected with expansion tank, at expansion tank top, breathing valve is set, the vapor phase areas of storage 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, described storage tank does not arrange breathing valve, the exhaust pipe on described each storage tank is provided with flame trap.
2. the method preventing aromatic hydrocarbons tank area fire gas phase from propagating according to claim 1, is characterized in that regulating the valves as pneumatic valve on described supplementary nitrogen pipeline.
3. the method preventing aromatic hydrocarbons tank area fire gas phase from propagating according to claim 1, is characterized in that described oxygen content detector is connected with regulating the valves by data line.
4. the method preventing aromatic hydrocarbons tank area fire gas phase from propagating according to claim 1, is characterized in that described aromatic hydrocarbons is benzene,toluene,xylene, o-xylene, m-xylene, paraxylene, mixed benzene, ethylbenzene, more than C9 heavy aromatics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289289.8A CN104986471A (en) | 2015-05-29 | 2015-05-29 | Method for preventing gaseous phase propagation of fire in arene storage tank region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510289289.8A CN104986471A (en) | 2015-05-29 | 2015-05-29 | Method for preventing gaseous phase propagation of fire in arene storage tank region |
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| CN104986471A true CN104986471A (en) | 2015-10-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767697A (en) * | 2009-12-31 | 2010-07-07 | 杜扬 | Intrinsically safe inerting protection method and device for oil storage tank |
| JP2013053639A (en) * | 2011-09-01 | 2013-03-21 | Jfe Steel Corp | Gas holder for combustible gas |
| 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 |
-
2015
- 2015-05-29 CN CN201510289289.8A patent/CN104986471A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767697A (en) * | 2009-12-31 | 2010-07-07 | 杜扬 | Intrinsically safe inerting protection method and device for oil storage tank |
| JP2013053639A (en) * | 2011-09-01 | 2013-03-21 | Jfe Steel Corp | Gas holder for combustible gas |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 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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