CN103521027A - Oxygen-removed oil gas recovery method and device - Google Patents
Oxygen-removed oil gas recovery method and device Download PDFInfo
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- CN103521027A CN103521027A CN201310442717.7A CN201310442717A CN103521027A CN 103521027 A CN103521027 A CN 103521027A CN 201310442717 A CN201310442717 A CN 201310442717A CN 103521027 A CN103521027 A CN 103521027A
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Abstract
The invention discloses an oxygen-removed oil gas recovery method and device. The method comprises the following sequential steps: an adsorption step, a vacuum desorption step and a purging step at the final stage of desorption, wherein an oxygen gas replacement step between the adsorption step and the vacuum desorption step; and the oxygen gas replacement step specifically comprises the following procedure: replacing oxygen gas in an adsorption tank with nitrogen gas until the remaining oxygen gas in the adsorption tank is removed, thus ensuring that oil gas sucked from the adsorption tank is high-concentration oxygen-free oil gas in the vacuum desorption step. Therefore, the situation that the oil gas sucked through vacuum desorption is the high-concentration oxygen-free oil gas can be realized; and in order to avoid the interfusion of oxygen gas caused by the fact that air is used as purging gas for the high-concentration oxygen-free oil gas sucked through guaranteed vacuum in the prior art, the purging gas used in the method is nitrogen gas.
Description
Technical field
The present invention relates to a kind of deoxygenation type oil-gas recovery method and device thereof, the gas that is applied in oil plant, petrochemical plant reclaims field, by the oil gas producing in Oil & Gas Storage cargo handling process and storage tank Big and Small Breath waste gas, be recycled into combustion gas, be sent to the gas ductwork of oil plant, petrochemical plant as fuel.
Background technology
At present, mainly adopt absorption method to oil gas is adsorbed, separation.Because active carbon only adsorbs the organic molecule in oil gas, not absorbed air, thereby air is directly discharged through active carbon bed, and organic molecule is attracted in the hole of active carbon.But the pore space of active carbon is limited, after absorption is saturated, just no longer possesses and continued the ability of absorption.By adopting the active-carbon bed way vacuumizing, the organic molecule desorption being adsorbed in active carbon hole can be processed, thereby make active carbon recover adsorption capacity.Utilize this principle, can adopt two groups of adsorption tanks alternations, a tank to adsorb and the way of another tank desorption, reach the object of continuous operation, thereby oil gas is passed through after adsorption system, be divided into two strands of gas, one is the direct emptying of purified gas, and one is sent to gas ductwork as fuel for concentrated gas.As shown in Figure 1, its course of work is the flow chart of common oil gas recovering device: low concentration containing oxygen oil gas, by blower fan, extract and deliver to adsorption system.Adsorption system is comprised of two adsorption tanks, by PLC logic control system, eight sequencing valves is opened and closed to control in certain sequence, reaches the object of switching.Two adsorption tanks have all been filled acticarbon, when charcoal absorption oil gas, increase along with adsorbance, can progressively reach capacity and lose adsorption capacity, must carry out could again possessing adsorption capacity after desorption and regeneration, thereby having adopted a tank absorption, another tank is the alternately mode of switch operating of desorption.During the absorption of A tank, open valve A
1, C
1.When A tank proceeds to desorption, shut off valve A
1, C
1, then open valve A
2, open vavuum pump A tank is vacuumized, when being evacuated to vacuum and reaching very low, then open valve C
2purge, then shut off valve A
2and vavuum pump, wait A pressure tank to return to after normal pressure shut off valve C again
2.The course of work of B tank is also like this.
The problem that prior art exists is: although filled active carbon in absorbent charcoal adsorption tank, but between the end socket of adsorption tanks, connecting pipe, activated carbon granule etc., all be full of aeriferous oil gas, in vacuum desorption process, these aeriferous oil gas can be extracted out by vavuum pump together along with desorption gas, therefore in isolated concentrated gas, can contain oxygen, oxygen concentration reaches 5～10%.It when combustion gas is used, is had to the danger of blasting.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of deoxygenation type oil-gas recovery method is provided, can, by aerobic low concentration oil gas by after adsorbing, be separated into purified gas and anaerobic high-concentration oil vapor.The direct emptying of purified gas, qualified discharge, and anaerobic high-concentration oil vapor, the gas ductwork that can directly be sent to factory is used as combustion gas, because oxygen concentration can be controlled at below 0.1%, substantially oxygen-free, thereby there is no the risk of blast completely.
Technical purpose of the present invention is to realize by following technical scheme:
A kind of deoxygenation type oil-gas recovery method, comprise following step in sequence: adsorption step, vacuum desorption step and desorption last stage purge step, between adsorption step and vacuum desorption step, also comprise replacement of oxygen step, this replacement of oxygen step is specially: adopt the oxygen in nitrogen replacement adsorption tanks, until the remaining oxygen in removal adsorption tanks, make in vacuum desorption step, the oil gas pumping out from adsorption tanks is high concentration anaerobic oil gas.
The sweep gas that described desorption last stage purge step adopts is nitrogen.
Another technical purpose of the present invention is to provide a kind of deoxygenation type device for recovering oil and gas of the deoxygenation type oil-gas recovery method based on above-mentioned, comprise two adsorption tanks, each adsorption tanks is all fitted with inlet manifold and the house steward that gives vent to anger, described inlet manifold carries branch road, vacuum draw branch road to be connected with low concentration aerobic oil gas respectively, and the house steward that gives vent to anger carries branch road to be connected with purified gas discharge branch road, sweep gas respectively; Described inlet manifold is also connected with nitrogen input branch road, and low concentration aerobic oil gas is carried branch road, vacuum draw branch road, nitrogen to input branch road and inlet manifold to select one and be communicated with or all in blocking state.
The sweep gas that described sweep gas carries branch road to carry is nitrogen.
Described nitrogen input branch road comprises nitrogen storage tank, nitrogen replacement inlet valve, and the nitrogen outlet of described nitrogen storage tank adopts pipeline to be connected with the inlet manifold of adsorption tanks through nitrogen replacement inlet valve.
The nitrogen inlet of described nitrogen storage tank is connected with source nitrogen.
Described sweep gas carries branch road to comprise sweep gas inlet valve, and the house steward that gives vent to anger of adsorption tanks is connected with nitrogen storage tank through sweep gas inlet valve.
Low concentration aerobic oil gas carries branch road to comprise low concentration aerobic oil-gas-source, air-introduced machine and oil and gas import valve, and this low concentration aerobic oil-gas-source is connected with the inlet manifold of adsorption tanks successively after air-introduced machine, air-introduced machine and oil and gas import valve.
According to above technical scheme, with respect to prior art, the present invention has advantages of following:
The present invention completes after adsorption step at adsorption tanks, carry out vacuum desorption before, adopt the remaining oxygen in nitrogen replacement adsorption tanks, can realize the oil gas pumping out through vacuum desorption is high concentration anaerobic oil gas; In addition, for guaranteeing that high concentration anaerobic oil gas that vacuum draw goes out suffers sneaking into of oxygen that in prior art, air used causes as sweep gas, sweep gas of the present invention is nitrogen.
Accompanying drawing explanation
Fig. 1 is the flow chart of common oil gas recovering device in prior art;
Fig. 2 is the flow chart of deoxygenation type device for recovering oil and gas of the present invention;
In figure: low concentration aerobic oil gas 1; Air-introduced machine 2; Dry vacuum pump 3; High concentration aerobic oil gas 4 '; High concentration anaerobic oil gas 4; The first adsorption tanks 5; The second adsorption tanks 6; Nitrogen storage tank 7; Nitrogen 8;
The first oil and gas import valve A
1, the first vacuum draw control valve A
2, the first nitrogen replacement inlet valve A
3, the second oil and gas import valve B
1, the second vacuum draw control valve B
2, the second nitrogen replacement inlet valve B
3, the first purified gas exhaust-control valve C
1, the first sweep gas inlet valve C
2, the second purified gas exhaust-control valve D
1, the second sweep gas inlet valve D
2.
The specific embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation; Below with reference to accompanying drawing, explain technical scheme of the present invention.
Deoxygenation type oil-gas recovery method of the present invention, its adsorption tanks absorption approach saturated after, block the introducing of low concentration aerobic oil gas in adsorption tanks inlet manifold, and input nitrogen in adsorption tanks inlet manifold, with the oxygen that aforementioned absorption is approached in saturated adsorption tanks, replace, to remove the remaining oxygen in adsorption tanks; Then, block after the input of nitrogen in adsorption tanks inlet manifold, by adsorption tanks inlet manifold, adsorption tanks are carried out to vacuum draw, to realize the desorption of active carbon core in adsorption tanks, finally adopt nitrogen blowing, until the pressure in adsorption tanks returns to normal pressure.
Recovery method based on above-mentioned, the invention provides a kind of deoxygenation type device for recovering oil and gas as shown in Figure 2, comprise two can alternation adsorption tanks, be respectively the first adsorption tanks, the second adsorption tanks, the first adsorption tanks, the second adsorption tanks are all fitted with inlet manifold and the house steward that gives vent to anger, the inlet manifold of the first described adsorption tanks and the inlet manifold of the second adsorption tanks carry branch road with low concentration aerobic oil gas respectively, vacuum draw branch road, nitrogen input branch road connects, and the house steward that gives vent to anger of give vent to anger house steward and second adsorption tanks of the first adsorption tanks discharges branch road with purified gas respectively, sweep gas carries branch road to connect, wherein:
For the first adsorption tanks, described nitrogen input branch road comprises nitrogen storage tank, the first nitrogen replacement inlet valve, and the nitrogen outlet of described nitrogen storage tank adopts pipeline to be connected with the inlet manifold of the first adsorption tanks through the first nitrogen replacement inlet valve; The sweep gas that described sweep gas carries branch road to carry is nitrogen, in the application, described sweep gas carries branch road to comprise the first sweep gas inlet valve, the house steward that gives vent to anger of the first adsorption tanks is connected with nitrogen storage tank through the first sweep gas inlet valve, i.e. nitrogen input branch road, sweep gas carry branch road to share same nitrogenous source; Low concentration aerobic oil gas carries branch road to comprise low concentration aerobic oil-gas-source, air-introduced machine and the first oil and gas import valve, and this low concentration aerobic oil-gas-source is connected with the inlet manifold of the first adsorption tanks successively after air-introduced machine and the first oil and gas import valve; Vacuum draw branch road comprises dry vacuum pump and the first vacuum draw control valve, and the pump orifice of dry vacuum pump is connected with the inlet manifold of the first adsorption tanks by the first vacuum draw control valve, and the output of its gas outlet is high concentration anaerobic oil gas.
For the second adsorption tanks, described nitrogen input branch road comprises nitrogen storage tank, the second nitrogen replacement inlet valve, and the nitrogen outlet of described nitrogen storage tank adopts pipeline to be connected with the inlet manifold of the second adsorption tanks through the second nitrogen replacement inlet valve; The sweep gas that described sweep gas carries branch road to carry is nitrogen, in the application, described sweep gas carries branch road to comprise the second sweep gas inlet valve, the house steward that gives vent to anger of the second adsorption tanks is connected with nitrogen storage tank through the second sweep gas inlet valve, i.e. nitrogen input branch road, sweep gas carry branch road to share same nitrogenous source; Low concentration aerobic oil gas carries branch road to comprise low concentration aerobic oil-gas-source, air-introduced machine and the second oil and gas import valve, and this low concentration aerobic oil-gas-source is connected with the inlet manifold of the second adsorption tanks successively after air-introduced machine and the second oil and gas import valve; Vacuum draw branch road comprises dry vacuum pump and the second vacuum draw control valve, and the pump orifice of dry vacuum pump is connected with the inlet manifold of the second adsorption tanks by the second vacuum draw control valve, and the output of its gas outlet is high concentration anaerobic oil gas.
The operation principle of deoxygenation type device for recovering oil and gas of the present invention is:
First, adopt air-introduced machine by low concentration aerobic oil gas through the first oil and gas import valve A
1introduce the first adsorption tanks, now the first purified gas exhaust-control valve C
1open, after the first adsorption tanks absorption oil gas is closely saturated, switches to the second adsorption tanks and carry out oil gas absorption; Now the first adsorption tanks are carried out to replacement of oxygen step, to carry out deoxygenation operation to adsorbing the first saturated adsorption tanks, specifically at the first oil and gas import valve A
1after, open the first nitrogen replacement inlet valve A
3, make the nitrogen in nitrogen storage tank pass through this first nitrogen replacement inlet valve A
3enter in the first adsorption tanks, with the oxygen in the high concentration aerobic oil gas in the first adsorption tanks, replace, remove the oxygen in this high concentration aerobic oil gas, then close the first nitrogen replacement inlet valve A
3, the first purified gas exhaust-control valve C
1, then adopt the mode vacuumizing, the first adsorption tanks are carried out to desorption processing, start dry vacuum pump, through the first vacuum draw control valve A
2the first adsorption tanks are carried out to vacuum draw processing, thereby realize the desorption of active carbon core wherein, make its adsorption capacity regeneration; Again desorption last stage, specifically the vacuum in adsorption tanks, not higher than 5Mpa, adopts nitrogen through the first sweep gas inlet valve C
2the first adsorption tanks are purged, in order to avoid introduce oxygen molecule in the first adsorption tanks, until the pressure in the first adsorption tanks returns to normal pressure; The operation principle of the second adsorption tanks and the first adsorption tanks are identical, do not repeat them here.
In summary, the present invention is directed to prior art, have following improvement:
1, the oil and gas import side at each adsorption tanks has increased nitrogen replacement inlet valve.
2, change the air purge valve of the tail gas outlet side setting of each adsorption tanks into nitrogen purge valve.
3, the inlet side of nitrogen replacement inlet valve and nitrogen purge valve all connects extraneous nitrogen.
4, in the control step of switching at adsorption tanks, adopted absorption last stage with nitrogen fully replace, technique in desorption last stage with nitrogen blowing, fully to remove oxygen, avoid air to enter in the desorption gas of recovery.
Claims (8)
1. a deoxygenation type oil-gas recovery method, comprise following step in sequence: adsorption step, vacuum desorption step and desorption last stage purge step, it is characterized in that: between adsorption step and vacuum desorption step, also comprise replacement of oxygen step, this replacement of oxygen step is specially: adopt the oxygen in nitrogen replacement adsorption tanks, until the remaining oxygen in removal adsorption tanks, make in vacuum desorption step, the oil gas pumping out from adsorption tanks is high concentration anaerobic oil gas.
2. the oil-gas recovery method of deoxygenation type according to claim 1, is characterized in that: the sweep gas that described desorption last stage purge step adopts is nitrogen.
3. the deoxygenation type device for recovering oil and gas based on deoxygenation type oil-gas recovery method claimed in claim 1, comprise two adsorption tanks, each adsorption tanks is all fitted with inlet manifold and the house steward that gives vent to anger, described inlet manifold carries branch road, vacuum draw branch road to be connected with low concentration aerobic oil gas respectively, and the house steward that gives vent to anger carries branch road to be connected with purified gas discharge branch road, sweep gas respectively; It is characterized in that, described inlet manifold is also connected with nitrogen input branch road, and low concentration aerobic oil gas is carried branch road, vacuum draw branch road, nitrogen to input branch road and inlet manifold to select one and be communicated with or all in blocking state.
4. according to power, require the deoxygenation type device for recovering oil and gas described in 3, it is characterized in that, the sweep gas that described sweep gas carries branch road to carry is nitrogen.
5. according to power, require the deoxygenation type device for recovering oil and gas described in 3, it is characterized in that, described nitrogen input branch road comprises nitrogen storage tank, nitrogen replacement inlet valve, and the nitrogen outlet of described nitrogen storage tank adopts pipeline to be connected with the inlet manifold of adsorption tanks through nitrogen replacement inlet valve.
6. according to power, require the deoxygenation type device for recovering oil and gas described in 5, it is characterized in that, the nitrogen inlet of described nitrogen storage tank is connected with source nitrogen.
7. according to power, require the deoxygenation type device for recovering oil and gas described in 5, it is characterized in that, described sweep gas carries branch road to comprise sweep gas inlet valve, and the house steward that gives vent to anger of adsorption tanks is connected with nitrogen storage tank through sweep gas inlet valve.
8. according to power, require the deoxygenation type device for recovering oil and gas described in 3, it is characterized in that, low concentration aerobic oil gas carries branch road to comprise low concentration aerobic oil-gas-source, air-introduced machine and oil and gas import valve, and this low concentration aerobic oil-gas-source is connected with the inlet manifold of adsorption tanks successively after air-introduced machine, air-introduced machine and oil and gas import valve.
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| CN201310442717.7A CN103521027A (en) | 2013-09-25 | 2013-09-25 | Oxygen-removed oil gas recovery method and device |
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| CN201310442717.7A CN103521027A (en) | 2013-09-25 | 2013-09-25 | Oxygen-removed oil gas recovery method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107621A (en) * | 2014-08-06 | 2014-10-22 | 南京大学 | Nitrogen purging-assisted organic exhaust gas recycling method through pressure swing adsorption of adsorbent resin |
| CN104958995A (en) * | 2015-06-23 | 2015-10-07 | 江苏中远环保科技有限公司 | Technology and device for treating organic waste gas with activated carbon by means of nitrogen heating and vacuum desorption |
| CN108310904A (en) * | 2018-03-15 | 2018-07-24 | 浙江佳力科技股份有限公司 | PID control automatically adjusts the petroleum vapor recovery unit and oil-gas recovery method of adsorptive pressure, desorption pressure |
| CN110585850A (en) * | 2019-09-05 | 2019-12-20 | 北方华锦化学工业股份有限公司 | Method for prolonging service cycle of adsorbent of oil gas recovery device |
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| CN201176393Y (en) * | 2008-01-31 | 2009-01-07 | 中国船舶重工集团公司第七一一研究所 | Oil vapour recovery unit |
| CN102805987A (en) * | 2012-08-22 | 2012-12-05 | 孙宗长 | Secondary-adsorption organic waste gas recovering method |
| CN103240059A (en) * | 2013-05-30 | 2013-08-14 | 南开大学 | Preparation method of active carbon for oil gas recovery |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008043920A (en) * | 2006-08-21 | 2008-02-28 | Kenji Nakajima | Organic matter-containing gas treatment facility and its treatment method |
| CN201176393Y (en) * | 2008-01-31 | 2009-01-07 | 中国船舶重工集团公司第七一一研究所 | Oil vapour recovery unit |
| CN102805987A (en) * | 2012-08-22 | 2012-12-05 | 孙宗长 | Secondary-adsorption organic waste gas recovering method |
| CN103240059A (en) * | 2013-05-30 | 2013-08-14 | 南开大学 | Preparation method of active carbon for oil gas recovery |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107621A (en) * | 2014-08-06 | 2014-10-22 | 南京大学 | Nitrogen purging-assisted organic exhaust gas recycling method through pressure swing adsorption of adsorbent resin |
| CN104958995A (en) * | 2015-06-23 | 2015-10-07 | 江苏中远环保科技有限公司 | Technology and device for treating organic waste gas with activated carbon by means of nitrogen heating and vacuum desorption |
| CN108310904A (en) * | 2018-03-15 | 2018-07-24 | 浙江佳力科技股份有限公司 | PID control automatically adjusts the petroleum vapor recovery unit and oil-gas recovery method of adsorptive pressure, desorption pressure |
| CN110585850A (en) * | 2019-09-05 | 2019-12-20 | 北方华锦化学工业股份有限公司 | Method for prolonging service cycle of adsorbent of oil gas recovery device |
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Application publication date: 20140122 |