CN105737517A - Method and device for purifying oil storage tank discharge gas - Google Patents
Method and device for purifying oil storage tank discharge gas Download PDFInfo
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- CN105737517A CN105737517A CN201410732110.7A CN201410732110A CN105737517A CN 105737517 A CN105737517 A CN 105737517A CN 201410732110 A CN201410732110 A CN 201410732110A CN 105737517 A CN105737517 A CN 105737517A
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Abstract
The invention relates to a method and a device for purifying oil storage tank discharge gas. The purifying device comprises an oil storage tank, a water-sealed tank, a gas compressor, and a condensation system. The discharge gas outlet on the top of the oil storage tank is divided into three paths. The first path is connected with the condensation system through the gas compressor. The second path is connected with the exhaling port of the water-sealed tank. The third path is connected with a waste gas exhaust port. The gas phase discharge port of the condensation system is connected with a low-pressure gas pipe network through a pipeline. The condensation system is also provided with a condensate discharge pipeline. The outlet of the low-pressure gas pipe network is divided into two paths, wherein the first path is connected with the air suction port of the water-sealed tank, and the second path is connected with the shielding gas inlet of the oil storage tank. A gas flow control facility is arranged on the pipeline connecting the low-pressure gas pipe network with the shielding gas inlet of the oil storage tank, and the gas flow control facility forms a pressure control adjusting system with a pressure detection facility on the top of the oil storage tank. The method and the device for purifying oil storage tank discharge gas are characterized by safe and reliable, simple device, and low investment.
Description
Technical field
The present invention relates to a kind of oil storage tank of environmental conservation and field of energy-saving technology discharge gas purifying method and device, specifically a kind of tank field vaporizing oil-gas reclaims the device for recovering oil and gas of hydro carbons.
Background technology
The light-end products such as gasoline contain substantial amounts of light hydrocarbon component, have very strong volatility, readily volatilized in storage and transport process, and the oil product of annual light-end products walk-off-loss accounts for the 0.5% of light-end products according to statistics.Produce huge energy waste and economic loss on the one hand, bring various harm on the other hand production and environment, as very easily caused fire explosion, contaminated environment, people can cause chronic or acute poisoning etc. after sucking.Therefore, oil gas reduction of discharging and recovery technology are always up the emphasis research topic in the fields such as domestic and international oil movement and storage engineering, environmental project, Chemical Engineering.
Traditional Investigation of Petroleum Vapor Recovery Technology mainly has four kinds of types: one is that condensation method reclaims oil gas, adopts two-stage or the cold deep condensation of three tier structure, is reclaimed by major part oil gas condensation；Two is that absorption process reclaims oil gas, adopts various suitable solvent absorption oil gas；Three is that absorption method reclaims oil gas, adopts various suitable solid absorbent (such as activated carbon) to adsorb oil gas, and adsorbent reactivation utilizes；Four is membrane separation process, utilizes the difference of the membrane permeation pressure of different material to be separated from oil gas by lighter hydrocarbons, then absorbs with petrol and diesel oil and reclaims lighter hydrocarbons.The technology of four kinds of types is respectively arranged with its advantage and weak point, on this basis, creates again various improvement technique and group technology.
WO9604978 adopts activated carbon as adsorbent, uses two towers to replace regeneration-absorbing process, vacuum pump pressure-swing desorption, and the condensed device condensation of desorption gas is reclaimed.During activated carbon adsorption oil-gas component, exotherm makes active carbon bed have bigger temperature rise, and when particularly gas concentration is higher, active carbon bed very easily produces the phenomenon of hot-spot, thus decreasing the service life of adsorbent, makes operating process there is potential safety hazard.
CN1494454A describes a kind of employing active carbon adsorption and reclaims organic device, after absorption stops, adopting steam desorption absorption organic component, condenses subsequently into condenser and reclaims, introduces the condensation of a large amount of steam, add device operating cost.CN1522785 discloses a kind of oil-gas recovery method, by oil gas compression cooling, adsorbs under pressure, and the method is disadvantageous in that, when processing oil and gas content instability, when particularly oil and gas content fluctuates widely, compressor is difficult to stable operation.
CN101342427A have employed a kind of condensation-adsorption combined technology and reclaims oil gas.Oil gas first passes through cooling-condensation and realizes part oil-gas component condensation separation, and solidifying oil gas is by adsorbing-pressure-swing desorption recovery, and absorption tail gas qualified discharge, desorbing oil gas returns chiller and enters condenser with collecting air-fuel mixture.Owing to desorbing oil gas causes oil gas back-mixing to reduce the dew point of desorbing oil gas with collecting air-fuel mixture, it is desirable to the temperature of condensation is lower, thus considerably increasing the operating cost of this condensation-adsorption combined technology.
CN1334313A discloses a kind of absorption-adsorption combined and reclaims oil gas technique, and oil gas first passes through absorbent and absorbs recovery section oil gas, and then oil gas reclaims oil gas further again through absorption, and gas is qualified discharge after absorption-adsorption treatment.This technique is to absorb the combination with absorption method, and it is disadvantageous in that technological process is longer, and operating cost is high.
The shortcomings such as it has been described above, existing Investigation of Petroleum Vapor Recovery Technology is primarily present operating cost height, security reliability is low, and oil gas recovery rate is relatively low.
Summary of the invention
It is an object of the invention to provide a kind of oil storage tank discharge gas purifying method and device, method for gas purification of the present invention and device have the advantages such as safe and reliable, equipment is simple, operating cost is low.
The invention provides a kind of oil storage tank discharge air purifying apparatus, described purifier includes oil storage tank, water sealed tank, gas compressor, condenser system, the tank deck discharge gas outlet line of described oil storage tank divides three tunnels, the first via is connected with condenser system through gas compressor, 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 with low pressure gas pipe network through pipeline; condenser system also sets up condensate discharge pipeline; the outlet of low pressure gas pipe network divides two-way; wherein; the first via is connected with the air entry of water sealed tank through air relief valve; second tunnel is connected with the protection gas entrance of oil storage tank, and low pressure gas pipe network protects gas entrance to be connected on pipeline and arrange gas flow control facility with oil storage tank, constitutes Stress control with the pressure detecting facility of oil storage tank deck and regulates system.
In oil storage tank of the present invention discharge air purifying apparatus, described oil storage tank top row bleeder holes divides three tunnels, and wherein the 3rd tunnel is connected with Waste gas outlet, is then sent to torch or incinerator.
In oil storage tank of the present invention discharge air purifying apparatus, described condenser system can be R22 refrigeration, ammonia refrigeration, lithium bromide refrigerating, hypothermic saline heat exchange condensation etc., and the chilling temperature of condenser system is-20 DEG C～-35 DEG C, it is preferable that-25 DEG C～-30 DEG C.
In oil storage tank of the present invention discharge air purifying apparatus, described gas compressor can adopt the one in liquid-piston compressor, melon formula compressor, screw compressor, it is preferable that liquid-piston compressor.
In oil storage tank of the present invention discharge air purifying apparatus, the exhaust pressure ratio low pressure gas ductwork pressure height 0.05MPa～0.1MPa of described gas compressor.The pressure at expulsion of gas compressor is 0.3MPa～0.5MPa, it is preferable that 0.35MPa～0.45MPa.
In oil storage tank of the present invention discharge air purifying apparatus, described air relief valve can adopt spring diaphragm type, piston type, lever and bellows-type etc., and the downstream pressure of air relief valve is 10Pa～20Pa.
In oil storage tank of the present invention discharge air purifying apparatus, described water sealed tank adopts two-way water seal, and water seal liquid adopts running water.
The invention provides a kind of oil storage tank discharge gas purifying method, described method includes herein below: when oil storage pressure inside the tank reaches 900～1500Pa, preferably during 1100～1400Pa, start gas compressor and carry out bleed, the tank deck discharge gas of oil storage tank is through collecting, and it is pressurized to 0.35MPa～0.45MP through gas compressor, gas after gas compressor compresses enters condenser system and condenses, by the heavy constituent oil gas condensation in discharge gas, lime set is collected into oil product oil storage tank, and uncondensed gas is discharged to low pressure gas pipe network；When oil storage pressure inside the tank reaches 500～900Pa, it is preferable that 600～800Pa, stopping compressor bleed, compressor bleed is intermittent operation；When oil storage pressure inside the tank is 0～500Pa, it is preferable that during 100～400Pa, regulates system by Stress control and be automatically replenished methane gas by oil storage tank protection gas entrance entrance oil storage tank, it is to avoid oil storage pressure inside the tank reduces further；When oil storage pressure inside the tank rises to 500～1000Pa, it is preferable that 600～800Pa, Stress control regulates system and is automatically stopped supplementary methane gas entrance oil storage tank；When the pressure in oil storage tank is low to moderate-400～0Pa, it is preferable that-300～-100Pa, water sealed tank carries out air-breathing, and sucking gas is pressure reduction gas gas, without influence on the safety in production of whole oil storage tank system；When the pressure height in oil storage tank is to 1500～3000Pa, it is preferable that 2000～2500Pa, Safety water seal is exhaled.
In oil storage tank of the present invention discharge gas purifying method, when oil storage tank needs to come into operation after maintenance, first carrying out nitrogen displacement, replace and enter material in backward tank before coming into operation in tank, simultaneously gas phase gathering line switches to Waste gas outlet, and discharge waste gas reduces internal heat torch or incinerator.Manually supplementing the nitrogen in methane gas displacement oil storage tank after charging stably, substitution gas reduces internal heat torch or incinerator.After oil storage tank replacement completion, emission-control equipment formally comes into operation.
Other technologies in the inventive method, if Safety water seal pressure setting, Refrigeration Technique, Stress control etc. are the contents that those skilled in the art is known.
Compared with prior art, oil storage tank of the present invention discharge gas purifying method has the advantage that
1, in oil storage tank of the present invention discharge gas purifying method, oil storage tank adopts water seal to carry out safeguard protection.When oil storage tank is sprained and is depressed into one's water breaks envelope pressure of inspiration(Pi), methane gas in low pressure gas pipe network is supplemented to oil storage tank through decompression, one's water breaks envelope, and oil storage tank crushing of spraining can be avoided bad and prevent constituent of air from entering oil storage tank；When gas superpressure in oil storage tank, water sealed tank is exhaled and is discharged, and oil storage tank pressure reduces, it is ensured that storage tank safe operation.
2, in oil storage tank of the present invention discharge gas purifying method; oil storage tank gas-phase space adopts the protection of low pressure gas gas; improve the dividing potential drop of gaseous component in oil storage tank; not only reduce the volatilization storing oil product; and reduce storage tank discharging gas condensation energy consumption; 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 simultaneously.
3, in oil storage tank of the present invention discharge gas purifying method, without constituent of air in oil storage tank discharge gas, discharge gas is made to be easier to condensation, discharge gas through overcompression, condensation and by heavy constituent oil gas condensation, on-condensible gas returns low pressure gas pipe network, and oil storage tank, when normal operating, is arranged outside contamination-free, achieve the target of zero release of pollutant, it is to avoid tank field Air Pollutant Emission.
4, oil storage tank of the present invention discharge gas purifying method and device have that safe and reliable, equipment is simple, it is low to invest, etc. feature.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of oil storage tank of the present invention discharge gas purifying method.
Detailed description of the invention
Further illustrate the concrete condition of the present invention below by specific embodiment, but be not limited to following embodiment.
The invention provides a kind of oil storage tank discharge air purifying apparatus, described purifier includes oil storage tank 5, water sealed tank 13, gas compressor 9, condenser system 10, described oil storage tank top row venting 6 outlet point three tunnels, the first via 8 is connected with condenser system 10 after gas compressor 9, second tunnel 7 is connected with water sealed tank 13 exhalation vents, and the 3rd tunnel 16 is connected with Waste gas outlet；The gas phase emission mouth of condenser system 10 is connected with low pressure gas pipe network 1 through pipeline 11; 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 the air entry of air relief valve 14 with water sealed tank 13; second tunnel 2 is connected with the protection gas entrance of oil storage tank 5, and low pressure gas pipe network protects gas entrance to be connected on pipeline and arrange gas flow control facility with oil storage tank, constitutes Stress control with the pressure detecting facility of oil storage tank deck and regulates system 4.
The invention provides a kind of oil storage tank discharge gas purifying method, the implementation process of this method includes herein below: each air vent of oil storage tank 5 is sealed by (1), it is to avoid oil storage tank and atmosphere；(2 when in oil storage tank 5, pressure reaches 900～1500Pa, preferably 1100～1400Pa, start compressor 9 and carry out bleed, oil storage tank 5 tank deck discharge gas 6 is collected into being pressurized to 0.35MPa～0.45MPa into gas compressor 9 through piping, condense subsequently into condenser system 10, by the heavy constituent oil gas condensation in waste gas, uncondensed gas is discharged to low pressure gas pipe network by pipeline 11, and the condensed liquid discharge pipe line 12 of lime set is collected into storage tank.When pressure reaches 500～900Pa in oil storage tank 5, it is preferable that 600～800Pa, stopping compressor 9 bleed, compressor 9 bleed is intermittent operation.(3) when in oil storage tank 5, pressure is 0～500Pa, it is preferable that 100～400Pa, Stress control regulates system 4 and is automatically replenished methane gas entrance oil storage tank 5, it is to avoid in oil storage tank 5, pressure reduces further；When in oil storage tank 5, pressure rises to 500～1000Pa, it is preferable that 600～800Pa, Stress control regulates system 4 and is automatically stopped supplementary methane gas entrance oil storage tank 5.(4) when the pressure in oil storage tank 5 is low to moderate-400～0Pa, it is preferable that-300～-100Pa, water sealed tank 13 carries out air-breathing, and sucking gas is pressure reduction gas gas, without influence on the safety in production of whole oil storage tank 5 system；When the pressure height in oil storage tank 5 is to 1500～3000Pa, it is preferable that 2000～2500Pa, water sealed tank 13 is exhaled, pipeline 15 discharge.
(5) when oil storage tank 5 needs to come into operation after maintenance, first carrying out nitrogen displacement, replace and enter material in backward tank 5 before coming into operation in tank 5, simultaneously gas phase gathering line 6 switches to Waste gas outlet 16, and discharge waste gas reduces internal heat torch or incinerator.Manually supplementing the nitrogen in methane gas displacement oil storage tank 5 after charging stably, substitution gas reduces internal heat torch or incinerator.
Embodiment 1
As it is shown in figure 1,4 5000m3The expiration tolerance of gasoline product oil storage tank 5 be about 300m3/ h, head space gas phase space connects, and adopts low-pressure gas as the protective gas of tank deck.Gas sampling air inlet gas compressor 9, compressor 9 adopts liquid-piston compressor, it is shown that compressor 9 pressure at expulsion is 0.4MPa.Waste gas through overcompression laggard enter condenser system 10, adopt hypothermic saline to be cooled to-30 DEG C, heavy constituent oil gas is cooled in condenser system 10, condensation, and solidifying oil gas enters low pressure gas pipe network 1.When in oil storage tank 5, pressure reaches 1200Pa, start compressor 9 and carry out bleed；When pressure reaches 600Pa in oil storage tank 5, stop compressor 9 bleed.When in oil storage tank 5, pressure is 200Pa, Stress control regulates system 4 and is automatically replenished methane gas entrance oil storage tank 5；When in oil storage tank 5, pressure rises to 600Pa, Stress control regulates system 4 and is automatically stopped supplementary methane gas entrance oil storage tank 5.When the pressure in oil storage tank 5 is low to moderate-200Pa, water sealed tank 13 carries out air-breathing, and sucking gas is pressure reduction gas gas；When the pressure height in oil storage tank 5 is to 2000Pa, water sealed tank 13 is exhaled.
When oil storage tank 5 needs to come into operation after maintenance, first carrying out nitrogen displacement, replace and enter material in backward tank 5 before coming into operation in tank, simultaneously gas phase gathering line 6 switches to torch or incinerator, and in tank, charging respiratory gas reduces internal heat torch or incinerator.Manually supplementing the nitrogen in methane gas displacement oil storage tank 5 after charging stably, substitution gas reduces internal heat torch or incinerator.Tank deck being collected after replacement completion gas and switches to emission-control equipment, emission-control equipment formally comes into operation.
Claims (11)
1. an oil storage tank discharge air purifying apparatus, described purifier includes oil storage tank, water sealed tank, gas compressor, condenser system, the tank deck discharge gas outlet line of described oil storage tank divides three tunnels, the first via is connected with condenser system through gas compressor, 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 with low pressure gas pipe network through pipeline; condenser system also sets up condensate discharge pipeline; the outlet of low pressure gas pipe network divides two-way; wherein; the first via is connected with the air entry of water sealed tank through air relief valve; second tunnel is connected with the protection gas entrance of oil storage tank, and low pressure gas pipe network protects gas entrance to be connected on pipeline and arrange gas flow control facility with oil storage tank, constitutes Stress control with the pressure detecting facility of oil storage tank deck and regulates system.
2. the device described in claim 1, it is characterised in that: described oil storage tank top row bleeder holes divides three tunnels, and wherein the 3rd tunnel is connected with Waste gas outlet, is then sent to torch or incinerator.
3. the device described in claim 1, it is characterised in that: described condenser system is R22 refrigeration, ammonia refrigeration, lithium bromide refrigerating, hypothermic saline heat exchange condensation.
4. the device described in claim 1, it is characterised in that: the chilling temperature of described condenser system is-20 DEG C～-35 DEG C, it is preferable that-25 DEG C～-30 DEG C.
5. the device described in claim 1, it is characterised in that: described gas compressor adopts the one in liquid-piston compressor, melon formula compressor, screw compressor, it is preferable that liquid-piston compressor.
6. the device described in claim 1, it is characterised in that: the exhaust pressure ratio low pressure gas ductwork pressure height 0.05MPa～0.1MPa of described gas compressor.
7. the device described in claim 1 or 6, it is characterised in that: the pressure at expulsion of described gas compressor is 0.3MPa～0.5MPa, it is preferable that 0.35MPa～0.45MPa.
8. the device described in claim 1, it is characterised in that: described air relief valve can adopt spring diaphragm type, piston type, lever, bellows-type.
9. the device described in claim 1, it is characterised in that: the downstream pressure of described air relief valve is 10Pa～20Pa.
10. the device described in claim 1, it is characterised in that: described water sealed tank adopts two-way water seal, and water seal liquid adopts running water.
11. an oil storage tank discharge gas purifying method, described method includes herein below: when oil storage pressure inside the tank reaches 900～1500Pa, preferably during 1100～1400Pa, start gas compressor and carry out bleed, the tank deck discharge gas of oil storage tank is through collecting, and it is pressurized to 0.35MPa～0.45MP through gas compressor, gas after gas compressor compresses enters condenser system and condenses, by the heavy constituent oil gas condensation in discharge gas, lime set is collected into oil product oil storage tank, and uncondensed gas is discharged to low pressure gas pipe network；When oil storage pressure inside the tank reaches 500～900Pa, it is preferable that 600～800Pa, stopping compressor bleed, compressor bleed is intermittent operation；When oil storage pressure inside the tank is 0～500Pa, it is preferable that during 100～400Pa, regulates system by Stress control and be automatically replenished methane gas by oil storage tank protection gas entrance entrance oil storage tank, it is to avoid oil storage pressure inside the tank reduces further；When oil storage pressure inside the tank rises to 500～1000Pa, it is preferable that 600～800Pa, Stress control regulates system and is automatically stopped supplementary methane gas entrance oil storage tank；When the pressure in oil storage tank is low to moderate-400～0Pa, it is preferable that-300～-100Pa, water sealed tank carries out air-breathing, and sucking gas is pressure reduction gas gas, without influence on the safety in production of whole oil storage tank system；When the pressure height in oil storage tank is to 1500～3000Pa, it is preferable that 2000～2500Pa, Safety water seal is 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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| 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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| CN105737517B CN105737517B (en) | 2018-04-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108097000A (en) * | 2017-12-29 | 2018-06-01 | 河南龙成煤高效技术应用有限公司 | A kind of technique of coal chemical industry coal gas oil gas centralized recovery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54115691A (en) * | 1978-02-07 | 1979-09-08 | Osaka Gas Co Ltd | Liquefied carbon dioxide producing equipment |
| 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 |
-
2014
- 2014-12-06 CN CN201410732110.7A patent/CN105737517B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54115691A (en) * | 1978-02-07 | 1979-09-08 | Osaka Gas Co Ltd | Liquefied carbon dioxide producing equipment |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108097000A (en) * | 2017-12-29 | 2018-06-01 | 河南龙成煤高效技术应用有限公司 | A kind of technique of coal chemical industry coal gas oil gas centralized recovery |
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| CN105737517B (en) | 2018-04-10 |
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