CN105737517B - A kind of oil storage tank discharge gas purifying method and device - Google Patents
A kind of oil storage tank discharge gas purifying method and device Download PDFInfo
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- CN105737517B CN105737517B CN201410732110.7A CN201410732110A CN105737517B CN 105737517 B CN105737517 B CN 105737517B CN 201410732110 A CN201410732110 A CN 201410732110A CN 105737517 B CN105737517 B CN 105737517B
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Abstract
The present invention relates to a kind of oil storage tank discharge gas purifying method and device, the purifier includes oil storage tank, water sealed tank, gas compressor, condenser system, three tunnels of the oil storage tank top row bleeder holes point, the first via is connected after gas compressor with condenser system, second tunnel is connected with water sealed tank exhalation vents, and the 3rd tunnel is connected with Waste gas outlet；The gas phase emission mouth of condenser system is connected through pipeline with low pressure gas pipe network; condenser system also sets up condensate discharge pipeline; the outlet of low pressure gas pipe network divides two-way; wherein; the first via connects through the air entry of pressure-reducing valve and water sealed tank; the protection gas entrance of second tunnel and oil storage tank connects, and low pressure gas pipe network forms Stress control regulating system with setting gas flow to control facility in oil storage tank protection gas entrance connecting pipeline with the pressure detecting facility of oil storage tank deck.Oil storage tank discharge gas purifying method and device of the present invention have the characteristics that safe and reliable, equipment is simple, investment is low.
Description
Technical field
The present invention relates to a kind of oil storage tank of environmental protection and field of energy-saving technology to discharge gas purifying method and device, specifically
It is a kind of device for recovering oil and gas of tank field vaporizing oil-gas recovery hydro carbons that ground, which is said,.
Background technology
The light-end products such as gasoline contain substantial amounts of light hydrocarbon component, have very strong volatility, are easily waved in storage and transport process
Hair, the oil product of annual light-end products walk-off-loss accounts for the 0.5% of light-end products according to statistics.On the one hand huge energy wave is produced
Take and economic loss, on the other hand bring various harm to production and environment, such as easily cause fire explosion, pollution environment,
It can cause chronic or acute poisoning etc. after people's suction.Therefore, oil gas emission reduction and recovery technology are always domestic and international oil movement and storage work
The emphasis research topic in the fields such as journey, environmental project, Chemical Engineering.
Traditional Investigation of Petroleum Vapor Recovery Technology mainly has four types：First, condensation method reclaims oil gas, using two-stage or three tier structure
Cold deep condensation, most of oil gas condensation is reclaimed；Second, absorption process reclaims oil gas, using various suitable solvent absorption oil
Gas；Third, absorption method reclaims oil gas, using various suitable solid absorbents（Such as activated carbon）Adsorb oil gas, adsorbent reactivation profit
With；Fourth, membrane separation process, lighter hydrocarbons are separated from oil gas using the difference of the osmolality power of different material, then use vapour
Diesel oil absorbs recovery lighter hydrocarbons.The technology of four types respectively has its advantage and weak point, on this basis, generates various change again
Enter technique and group technology.
WO9604978, as adsorbent, replaces regeneration-absorbing process, vavuum pump transformation solution using activated carbon using two towers
Inhale, the condensed device condensation recovery of desorption gas.During charcoal absorption oil-gas component, exotherm makes active carbon bed have larger temperature
Rise, when particularly gas concentration is higher, active carbon bed easily produces the phenomenon of hot-spot, so as to reduce making for adsorbent
With the life-span, operating process is set potential safety hazard to be present.
CN1494454A describes a kind of device that organic matter is reclaimed using active carbon adsorption, after absorption stops, using
Steam desorption absorption organic component, condenses subsequently into condenser and reclaims, and introduces a large amount of steam condensations, adds device operating cost
With.CN1522785 discloses a kind of oil-gas recovery method, and oil gas is compressed and cooled down, is adsorbed under pressure, this method
It is disadvantageous in that, when processing oil and gas content is unstable, when particularly oil and gas content fluctuates widely, compressor is difficult stable grasps
Make.
CN101342427A employs a kind of condensation-adsorption combined technology recovery oil gas.It is real that oil gas first passes through cooling-condensation
Now part oil-gas component condensation separation, not solidifying oil gas are reclaimed by absorption-pressure-swing desorption, absorption tail gas qualified discharge, desorb oil gas
Return to cooling device and enter condenser with collecting air-fuel mixture.Because desorption oil gas and collection air-fuel mixture cause oil gas back-mixing to drop
The low dew point of denuded oil gas, it is desirable to which the temperature of condensation is lower, so as to considerably increase the operation of this condensation-adsorption combined technology
Expense.
CN1334313A discloses a kind of absorption-adsorption combined recovery oil gas technique, and oil gas first passes through absorbent and absorbed back
Receiving portions oil gas, then oil gas is again by adsorbing further recovery oil gas, gas qualified discharge after absorption-adsorption treatment.
The technique is to absorb the combination with absorption method, and it is disadvantageous in that technological process is longer, and operating cost is high.
As described above, existing Investigation of Petroleum Vapor Recovery Technology is primarily present operating cost height, security reliability is low, oil gas recovery rate
The shortcomings of relatively low.
The content of the invention
It is an object of the invention to provide a kind of oil storage tank discharge gas purifying method and device, gas purification of the present invention
Method and device has the advantages such as safe and reliable, equipment is simple, operating cost is low.
The invention provides a kind of oil storage tank to discharge air purifying apparatus, and the purifier includes oil storage tank, water sealed tank, gas
Gas compressor, condenser system, three tunnels of tank deck discharge gas outlet line point of the oil storage tank, the first via through gas compressor with it is cold
Solidifying system connection, the second tunnel are connected with water sealed tank exhalation vents, and the 3rd tunnel is connected with Waste gas outlet；The gas phase emission of condenser system
Mouth is connected through pipeline with low pressure gas pipe network, and condenser system also sets up condensate discharge pipeline, the outlet point of low pressure gas pipe network
Two-way, wherein, the first via connects through the air entry of pressure-reducing valve and water sealed tank, and the protection gas entrance of the second tunnel and oil storage tank connects,
And low pressure gas pipe network in oil storage tank protection gas entrance connecting pipeline with setting gas flow to control facility, the pressure with oil storage tank deck
Power checkout facility forms Stress control regulating system.
In oil storage tank discharge air purifying apparatus of the present invention, three tunnels of the oil storage tank top row bleeder holes point, wherein the 3rd tunnel
It is connected with Waste gas outlet, is then sent to torch or incinerator.
In oil storage tank discharge air purifying apparatus of the present invention, described condenser system can be R22 refrigeration, ammonia refrigeration, bromination
Lithium refrigeration, hypothermic saline heat exchange condensation etc., the chilling temperature of condenser system is -20 DEG C~-35 DEG C, preferably -25 DEG C~-30 DEG C.
In oil storage tank discharge air purifying apparatus of the present invention, described gas compressor can use liquid-piston compressor, melon formula
One kind in compressor, screw compressor, preferably liquid-piston compressor.
In oil storage tank discharge air purifying apparatus of the present invention, the exhaust pressure ratio low pressure gas pipe network pressure of the gas compressor
High 0.05MPa~the 0.1MPa of power.The pressure at expulsion of gas compressor is 0.3MPa~0.5MPa, preferably 0.35MPa~
0.45MPa。
In oil storage tank discharge air purifying apparatus of the present invention, described pressure-reducing valve can use spring diaphragm type, piston type, lever
Formula and bellows-type etc., the downstream pressure of pressure-reducing valve is 10Pa~20Pa.
In oil storage tank discharge air purifying apparatus of the present invention, described water sealed tank uses two-way water seal, and water seal liquid is using length
Flowing water.
The invention provides a kind of oil storage tank to discharge gas purifying method, and methods described includes herein below：When in oil storage tank
When pressure reaches 900~1500Pa, during preferably 1100~1400Pa, start gas compressor and carry out bleed, the tank deck of oil storage tank
Gas is discharged by collecting, and 0.35MPa~0.45MP is pressurized to through gas compressor, the gas after gas compressor compresses
Condensed into condenser system, the heavy constituent oil gas condensation in gas will be discharged, lime set is collected into oil product oil storage tank, uncooled gas
Body is emitted into low pressure gas pipe network；When oil storage pressure inside the tank reaches 500~900Pa, preferably 600~800Pa, stop compressor
Bleed, compressor bleed are intermittent operation；When oil storage pressure inside the tank is 0~500Pa, during preferably 100~400Pa, pass through
Stress control regulating system is automatically replenished methane gas and enters oil storage tank by oil storage tank protection gas entrance, avoids oil storage pressure inside the tank
Further reduce；When oil storage pressure inside the tank rises to 500~1000Pa, preferably 600~800Pa, Stress control regulating system is certainly
The dynamic supplement methane gas that stops enters oil storage tank；As pressure as little as -400~0Pa in oil storage tank, preferably -300~-
100Pa, water sealed tank carry out air-breathing, and suction gas is pressure reduction gas gas, does not interfere with the safety in production of whole oil storage tank system；
As pressure up to 1500~3000Pa in oil storage tank, preferably 2000~2500Pa, Safety water seal is exhaled.
In oil storage tank discharge gas purifying method of the present invention, when oil storage tank needs to come into operation after maintenance, before coming into operation in tank
Nitrogen displacement is first carried out, replaces and enters material in backward tank, while gas phase gathering line switches to Waste gas outlet, discharges waste gas
Remove torch or incinerator.Nitrogen in supplement methane gas displacement oil storage tank manually after charging is stable, substitution gas go torch or
Incinerator.After oil storage tank replacement completion, emission-control equipment formally comes into operation.
Other technologies in the inventive method, such as the setting of Safety water seal pressure, Refrigeration Technique, Stress control are this specialties
Content known to technical staff.
Compared with prior art, oil storage tank discharge gas purifying method of the present invention has the following advantages that：
1st, in oil storage tank discharge gas purifying method of the present invention, oil storage tank carries out safeguard protection using water seal.When oil storage tank is sprained
When being depressed into one's water breaks envelope pressure of inspiration(Pi), the methane gas in low pressure gas pipe network is supplemented to oil storage tank by decompression, one's water breaks envelope, can keep away
It is bad and prevent constituent of air from entering oil storage tank to exempt from oil storage tank crushing of spraining；When gas superpressure in oil storage tank, water sealed tank, which is exhaled, to be discharged, storage
Tank pressure reduces, it is ensured that storage tank safe operation.
2nd, in oil storage tank discharge gas purifying method of the present invention, oil storage tank gas-phase space is protected using low pressure gas gas, is carried
The partial pressure of gaseous component, not only reduces the volatilization of storage oil product, and reduce storage tank discharging gas condensation energy in high oil storage tank
Consumption, while ensure that the completely isolated of oil product in oil storage tank, oil gas and oxygen so that oil storage tank is in essential safety.
3rd, in oil storage tank discharge gas purifying method of the present invention, without constituent of air in oil storage tank discharge gas so that discharge gas is more
It is easy to condense, for discharge gas through overcompression, condensation and by heavy constituent oil gas condensation, on-condensible gas returns to low pressure gas pipe network, oil storage
Tank is arranged in normal operating outside contamination-free, realizes the target of zero release of pollutant, avoids tank field atmosphere pollution row
Put.
4th, oil storage tank of the present invention discharge gas purifying method and device have safe and reliable, equipment is simple, investment is low, etc. spy
Point.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of oil storage tank discharge gas purifying method of the present invention.
Embodiment
The concrete condition of the present invention is further illustrated below by specific embodiment, but is not limited to following embodiments.
The invention provides a kind of oil storage tank to discharge air purifying apparatus, and the purifier includes oil storage tank 5, water sealed tank
13rd, gas compressor 9, condenser system 10,6 outlet point of oil storage tank top row deflation, three tunnels, the first via 8 is through gas compressor 9
It is connected afterwards with condenser system 10, the second tunnel 7 is connected with the exhalation vents of water sealed tank 13, and the 3rd tunnel 16 is connected with Waste gas outlet；Condensation
The gas phase emission mouth of system 10 is connected through pipeline 11 with low pressure gas pipe network 1, and condenser system 10 also sets up condensate discharge pipeline
12, the outlet of low pressure gas pipe network 1 divides two-way, wherein, the first via 3 is connected through pressure-reducing valve 14 with the air entry of water sealed tank 13, the
Two tunnels 2 are connected with the protection gas entrance of oil storage tank 5, and low pressure gas pipe network in oil storage tank protection gas entrance connecting pipeline with setting
Gas flow controls facility, and Stress control regulating system 4 is formed with the pressure detecting facility of oil storage tank deck.
The invention provides a kind of oil storage tank to discharge gas purifying method, and the implementation process of this method includes herein below：（1）
Each exhaust outlet of oil storage tank 5 is sealed, avoids oil storage tank from being communicated with air；（2）When pressure reaches 900 in oil storage tank 5
During~1500Pa, preferably 1100~1400Pa, start compressor 9 and carry out bleed, the tank deck of oil storage tank 5 discharge gas 6 is received through piping
Collection is pressurized to 0.35MPa~0.45MPa into gas compressor 9, is condensed subsequently into condenser system 10, by waste gas
Heavy constituent oil gas condensation, uncondensed gas are emitted into low pressure gas pipe network by pipeline 11, and the condensed liquid discharge pipe line 12 of lime set is received
Collect into storage tank.When pressure reaches 500~900Pa in oil storage tank 5, preferably 600~800Pa, stop the bleed of gas compressor 9,
The bleed of gas compressor 9 is intermittent operation.（3）When pressure is 0~500Pa in oil storage tank 5, preferably 100~400Pa, pressure
Power controlling and regulating system 4 is automatically replenished methane gas and enters oil storage tank 5, avoids pressure in oil storage tank 5 from further reducing；Work as oil storage
When pressure rises to 500~1000Pa in tank 5, preferably 600~800Pa, Stress control regulating system 4 is automatically stopped supplement device in Gas
Body enters oil storage tank 5.（4）As pressure as little as -400~0Pa in oil storage tank 5, preferably -300~-100Pa, water sealed tank 13 enters
Row air-breathing, suction gas are pressure reduction gas gas, do not interfere with the safety in production of the whole system of oil storage tank 5；When in oil storage tank 5
During pressure up to 1500~3000Pa, preferably 2000~2500Pa, water sealed tank 13 is exhaled, and is discharged by pipeline 15.
（5）When oil storage tank 5 needs to come into operation after maintenance, nitrogen displacement is first carried out before coming into operation in oil storage tank 5, is replaced
Enter material in backward oil storage tank 5, while gas phase gathering line switches to Waste gas outlet, discharge waste gas removes torch or incinerator.
The nitrogen in supplement methane gas displacement oil storage tank 5, substitution gas remove torch or incinerator manually after charging is stable.
Embodiment 1
As shown in figure 1,4 5000m3The expiration tolerance of gasoline product oil storage tank 5 be about 300m3/ h, oil storage head space gas
Phase space is connected, using protective gas of the low-pressure gas as oil storage tank deck.Gas sampling enters gas compressor 9, gas
Gas compressor 9 uses liquid-piston compressor, and the shown pressure at expulsion of gas compressor 9 is 0.4 MPa.Waste gas enters after overcompression
Condenser system 10, -30 DEG C are cooled to using hypothermic saline, heavy constituent oil gas is cooled in condenser system 10, condensed, not solidifying oil
Gas enters low pressure gas pipe network 1.When pressure reaches 1200Pa in oil storage tank 5, startup gas compressor 9 carries out bleed；Work as oil storage
When pressure reaches 600Pa in tank 5, stop the bleed of gas compressor 9.When pressure is 200Pa in oil storage tank 5, Stress control is adjusted
Section system 4 is automatically replenished methane gas and enters oil storage tank 5；When pressure rises to 600Pa, Stress control regulating system 4 in oil storage tank 5
It is automatically stopped supplement methane gas and enters oil storage tank 5.As the as little as -200Pa of the pressure in oil storage tank 5, water sealed tank 13 carries out air-breathing,
Suction gas is pressure reduction gas gas；As the pressure up to 2000Pa in oil storage tank 5, water sealed tank 13 is exhaled.
When oil storage tank 5 needs to come into operation after maintenance, nitrogen displacement is first carried out before coming into operation in oil storage tank, is replaced backward
Enter material in oil storage tank 5, while gas phase gathering line switches to torch or incinerator, in oil storage tank charging tidal air go torch or
Incinerator.The nitrogen in supplement methane gas displacement oil storage tank 5, substitution gas remove torch or incinerator manually after charging is stable.
Tank deck collection gas is switched into emission-control equipment after replacement completion, emission-control equipment formally comes into operation.
Claims (14)
1. a kind of oil storage tank discharges air purifying apparatus, the purifier includes oil storage tank, water sealed tank, gas compressor, condensation
System, three tunnels of tank deck discharge gas outlet line point of the oil storage tank, the first via are connected through gas compressor with condenser system, the
Two tunnels are connected with water sealed tank exhalation vents, and the 3rd tunnel is connected with Waste gas outlet；The gas phase emission mouth of condenser system through pipeline with it is low
The connection of gas pipe network is pressed, condenser system also sets up condensate discharge pipeline, and the outlet of low pressure gas pipe network divides two-way, wherein, the
Connected all the way through the air entry of pressure-reducing valve and water sealed tank, the protection gas entrance of the second tunnel and oil storage tank connects, and low pressure gas pipe
Net in oil storage tank protection gas entrance connecting pipeline with setting gas flow to control facility, the pressure detecting facility structure with oil storage tank deck
Into Stress control regulating system.
2. according to the device described in claim 1, it is characterised in that：Three tunnels of the oil storage tank top row bleeder holes point, wherein the
Three tunnels are connected with Waste gas outlet, are then sent to torch or incinerator.
3. according to the device described in claim 1, it is characterised in that：Described condenser system is R22 refrigeration, ammonia refrigeration, bromination
Lithium refrigeration, hypothermic saline heat exchange condensation.
4. according to the device described in claim 1, it is characterised in that：The chilling temperature of the condenser system is -20 DEG C~-35
℃。
5. according to the device described in claim 1 or 4, it is characterised in that：The chilling temperature of the condenser system be -25 DEG C~-
30℃。
6. according to the device described in claim 1, it is characterised in that：Described gas compressor is using liquid-piston compressor, melon
One kind in formula compressor, screw compressor.
7. according to the device described in claim 1, it is characterised in that：The exhaust pressure ratio low pressure gas pipe of the gas compressor
High 0.05MPa~the 0.1MPa of net pressure.
8. according to the device described in claim 1, it is characterised in that：The pressure at expulsion of the gas compressor be 0.3MPa~
0.5MPa。
9. according to the device described in claim 1 or 8, it is characterised in that：The pressure at expulsion of the gas compressor is 0.35MPa
~0.45MPa.
10. according to the device described in claim 1, it is characterised in that：The pressure-reducing valve is using spring diaphragm type, piston type, thick stick
One kind in rod-type, bellows-type.
11. according to the device described in claim 1, it is characterised in that：The downstream pressure of the pressure-reducing valve is 10Pa~20Pa.
12. according to the device described in claim 1, it is characterised in that：Described water sealed tank uses two-way water seal, and water seal liquid is adopted
Use running water.
13. a kind of oil storage tank discharges gas purifying method, methods described includes herein below：When oil storage pressure inside the tank reaches 900~
During 1500Pa, start gas compressor and carry out bleed, the tank deck discharge gas of oil storage tank is pressurized by collecting through gas compressor
To 0.35MPa~0.45MP, the gas after gas compressor compresses is condensed into condenser system, by discharge gas
Heavy constituent oil gas condensation, lime set are collected into oil product oil storage tank, and uncondensed gas is emitted into low pressure gas pipe network；When oil storage tank internal pressure
When power reaches 500~900Pa, stop gas compressor bleed, gas compressor bleed is intermittent operation；When oil storage tank internal pressure
When power is 0~500Pa, methane gas is automatically replenished by Stress control regulating system and protects gas entrance to enter oil storage by oil storage tank
Tank, oil storage pressure inside the tank is avoided further to reduce；When oil storage pressure inside the tank rises to 500~1000Pa, Stress control regulation system
System is automatically stopped supplement methane gas and enters oil storage tank；As pressure as little as -400~0Pa in oil storage tank, water sealed tank is inhaled
Gas, suction gas are pressure reduction gas gas, do not interfere with the safety in production of whole oil storage tank system；When the pressure in oil storage tank is high
During to 1500~3000Pa, Safety water seal is exhaled.
14. discharge gas purifying method according to the oil storage tank described in claim 13, it is characterised in that：When oil storage pressure inside the tank reaches
During 1100~1400Pa, starting gas compressor and carry out bleed, the tank deck discharge gas of oil storage tank, which passes through, to be collected, and through gas compression
Machine is pressurized to 0.35MPa~0.45MP, and the gas after gas compressor compresses is condensed into condenser system, will discharge
Heavy constituent oil gas condensation in gas, lime set are collected into oil product oil storage tank, and uncondensed gas is emitted into low pressure gas pipe network；Work as oil storage
Pressure inside the tank reaches 600~800Pa, stops gas compressor bleed, gas compressor bleed is intermittent operation；Work as oil storage tank
When interior pressure is 100~400Pa, methane gas is automatically replenished by Stress control regulating system and protects gas entrance to enter by oil storage tank
Enter oil storage tank, avoid oil storage pressure inside the tank from further reducing；When oil storage pressure inside the tank rises to 600~800Pa, Stress control regulation
System is automatically stopped supplement methane gas and enters oil storage tank；As little as -300~-100Pa of the pressure in oil storage tank, water sealed tank enters
Row air-breathing, suction gas are pressure reduction gas gas, do not interfere with the safety in production of whole oil storage tank system；When the pressure in oil storage tank
Power up to 2000~2500Pa, Safety water seal are exhaled.
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| CN201410732110.7A CN105737517B (en) | 2014-12-06 | 2014-12-06 | A kind of oil storage tank discharge gas purifying method and device |
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| CN107686741A (en) * | 2016-08-04 | 2018-02-13 | 王建基 | The oil gas reclaiming technical technology that VOCs zero-emissions save again |
| CN108069155A (en) * | 2016-11-11 | 2018-05-25 | 中国石油化工股份有限公司抚顺石油化工研究院 | A kind of storage tank discharging gas emission reduction and recovery system |
| CN108097000B (en) * | 2017-12-29 | 2021-09-17 | 河南龙成煤高效技术应用有限公司 | Process for centralized recovery of coal gas and oil gas in coal chemical industry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202279687U (en) * | 2011-10-17 | 2012-06-20 | 中国石油化工股份有限公司 | Oil-gas recovery device |
| CN203558373U (en) * | 2013-10-29 | 2014-04-23 | 盖金祥 | Oil gas recovery device of oil product storage tanks |
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| JPS54115691A (en) * | 1978-02-07 | 1979-09-08 | Osaka Gas Co Ltd | Liquefied carbon dioxide producing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202279687U (en) * | 2011-10-17 | 2012-06-20 | 中国石油化工股份有限公司 | Oil-gas recovery device |
| CN203558373U (en) * | 2013-10-29 | 2014-04-23 | 盖金祥 | Oil gas recovery device of oil product storage tanks |
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