CN104986466A - Method for preventing gaseous phase explosion of arene storage tank and reducing volatile matter emission - Google Patents
Method for preventing gaseous phase explosion of arene storage tank and reducing volatile matter emission Download PDFInfo
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- CN104986466A CN104986466A CN201510288561.0A CN201510288561A CN104986466A CN 104986466 A CN104986466 A CN 104986466A CN 201510288561 A CN201510288561 A CN 201510288561A CN 104986466 A CN104986466 A CN 104986466A
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- storage tank
- pipeline
- nitrogen
- gas phase
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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
- B65D90/30—Recovery of escaped vapours
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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
-
- 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
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/34—Venting means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for preventing gaseous phase explosion of an arene storage tank and reducing volatile matter emission, and mainly solves problems in the prior art that nitrogen consumption is large and environment is polluted. The method for preventing gaseous phase explosion of an arene storage tank and reducing volatile matter emission 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. The top of the buffer tank is provided with a breather valve. The breather valve on the top of the buffer tank is provided with an air inlet and a tail gas outlet. The tail gas outlet is connected with an oil vapor recovery device through a pipeline. The upper part of the oil vapor recovery device is provided with a tail gas discharge pipeline. The technical scheme preferably solves the above problem, and can be used to prevent arene storage tank from gaseous phase explosion.
Description
Technical field
The present invention relates to a kind of aromatic hydrocarbons storage tank gas phase that prevents fire and reduce the method for evaporative emissions.
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 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.
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, the technical scheme of torch or burning is sent to solve the problems referred to above preferably by reduce internal heat torch or incinerator pipeline excessive gas, can be used in the protection of storage tank.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 is the problem of comparatively large, the contaminated environment of nitrogen consumption in prior art, provides a kind of aromatic hydrocarbons storage tank gas phase that prevents newly fire and reduce the method for evaporative emissions.During the method is used for preventing aromatic hydrocarbons storage tank gas phase from firing, there is the advantage that nitrogen consumption is less, free from environmental pollution.
For solving the problem, the technical solution used in the present invention is as follows: a kind of aromatic hydrocarbons storage tank gas phase that prevents fires and reduces the method for evaporative emissions, 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, described storage tank does not arrange breathing valve, arranges breathing valve at expansion tank top, the breathing valve at expansion tank top is provided with air intake and offgas outlet, 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.
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.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 minimizing evaporative emissions, 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 exhaust emissions pipeline; 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.
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 aromatic hydrocarbons storage tank gas phase to fire, equipment therefor 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).
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.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.
[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. one kind prevents aromatic hydrocarbons storage tank gas phase from firing and reducing the method for evaporative emissions, 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, described storage tank does not arrange breathing valve, arranges breathing valve at expansion tank top, the breathing valve at expansion tank top is provided with air intake and offgas outlet, 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.
2. prevent aromatic hydrocarbons storage tank gas phase from firing and reducing the method for evaporative emissions according to claim 1, it is characterized in that regulating the valves as pneumatic valve on described supplementary nitrogen pipeline.
3. prevent aromatic hydrocarbons storage tank gas phase from firing and reducing the method for evaporative emissions according to claim 1, it is characterized in that described oxygen content detector is connected with regulating the valves by data line.
4. prevent aromatic hydrocarbons storage tank gas phase from firing and reducing the method for evaporative emissions according to claim 1, it 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 |
|---|---|---|---|
| CN201510288561.0A CN104986466A (en) | 2015-05-29 | 2015-05-29 | Method for preventing gaseous phase explosion of arene storage tank and reducing volatile matter emission |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510288561.0A CN104986466A (en) | 2015-05-29 | 2015-05-29 | Method for preventing gaseous phase explosion of arene storage tank and reducing volatile matter emission |
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| CN104986466A true CN104986466A (en) | 2015-10-21 |
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| CN201510288561.0A Pending CN104986466A (en) | 2015-05-29 | 2015-05-29 | Method for preventing gaseous phase explosion of arene storage tank and reducing volatile matter emission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972424A (en) * | 2016-06-28 | 2016-09-28 | 鄂尔多斯市君正能源化工有限公司 | Gas recycling system |
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| JP2009120204A (en) * | 2007-11-12 | 2009-06-04 | Taiheiyo Cement Corp | Storing system for low flash point fuel |
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| CN203529116U (en) * | 2013-09-27 | 2014-04-09 | 山西新泰钢铁有限公司 | Crude benzene storage tank nitrogen protecting device |
| 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 |
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2015
- 2015-05-29 CN CN201510288561.0A patent/CN104986466A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009120204A (en) * | 2007-11-12 | 2009-06-04 | Taiheiyo Cement Corp | Storing system for low flash point fuel |
| 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 |
| CN203529116U (en) * | 2013-09-27 | 2014-04-09 | 山西新泰钢铁有限公司 | Crude benzene storage tank nitrogen protecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105972424A (en) * | 2016-06-28 | 2016-09-28 | 鄂尔多斯市君正能源化工有限公司 | Gas recycling system |
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Application publication date: 20151021 |