CN103933828A - Multi-stage adsorption type oil gas recycling system and recycling process thereof - Google Patents
Multi-stage adsorption type oil gas recycling system and recycling process thereof Download PDFInfo
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Abstract
The invention relates to a multi-stage adsorption type oil gas recycling system and a recycling process thereof. The recycling system comprises an oil gas recycling device, a two-stage adsorption device, a variable pressure desorption device and a lean oil absorbing and circulating device which are connected to one other. The recycling process comprises the steps of oil gas inputting, oil gas adsorbing, adsorption tank desorbing and oil gas absorbing. As few adsorption tanks as possible are used to realize the two-stage adsorption of oil gas, as few vacuum pumps as possible are used to realize the desorption, and the multi-stage adsorption type oil gas recycling process disclosed by the invention is low in investment cost, small in occupied area and high in recycling rate.
Description
Technical field
The present invention relates to a kind of oil gas recovery processing system and recovery processing technique thereof, refer more particularly to a kind of multistage absorption type gas recovery system for oil and treatment process thereof of high-recovery.
Background technology
Along with the pay attention to day by day of China to environmental protection, country and industry are made various laws, standard a nd norm successively strictly to retrain exhaust of oil.Wherein on August 1st, 2007, national environmental protection department has enacted and enforced GB20950-2007 " storage tank farm atmosphere pollutants emission standards ", GB20951-2007 " gasoline transport atmosphere pollutants emission standards " and GB20952-2007 " gas station's atmosphere pollutants emission standards ", and in standard, clearly regulation requires oil gas recovery processing system outlet concentration value to be less than 25g/m
3, organic efficiency is greater than more than 95%.In a foreseeable future, country and industry will promulgate that stricter standard, to reduce the discharge of gas concentration, needs the further higher oil gas recovery processing system of the exploitation rate of recovery.
Current Investigation of Petroleum Vapor Recovery Technology both domestic and external mainly contains absorption process, absorption method, condensation method and membrane separation process etc.Wherein absorption process is eliminated gradually because its exhaust emissions concentration is high; Membrane separation process is restricted because lacking the mature and stable film product that is applicable to oil gas recovery; The foundation of investment of absorption method and two kinds of technology of condensation method is suitable, but condensation method is high compared with absorption method energy consumption, operating cost is high, therefore most oil gas recovery process is selected absorption method, but at present absorption method conventionally adopt be two charcoal canisters of one-level adsorbent equipment alternately absorption is to complete the absorption to oil gas, oil gas outlet concentration value is not still very good.Under this background, development and Design more multistage absorption oil gas recovery processing system and the recovery processing technique of high-recovery is imperative.
In prior art, the Chinese invention patent that publication number is CN101259358A discloses a kind of lasting circulating type oil-gas adsorption recovery method, comprising: (1) utilizes the activated carbon beds absorption in adsorption tower to reclaim oil gas; (2) carry out desorption and regeneration to adsorbing saturated adsorption tower; (3) high-concentration oil vapor desorbing enters recovery tower, is absorbed by the poor gasoline body of liquid state; (4) tail gas in recovery tower reenters adsorption tower circulation absorption; Wherein at least two adsorption tanks sorption and desorption regeneration that hockets in adsorption tower, makes sustainable the looping of oil gas absorption, can utilize Automatic Control program to realize remote monitoring simultaneously.To be that investment cost is less and basic can reach the gas concentration discharge value specifying in standard to the advantage of this system, but it is is further improved and optimizated and be necessary.
Publication number is that the Chinese invention patent of CN102764563A discloses a kind of adsorption compression formula oil gas recovery processing system and recovery processing technique thereof, system comprises oil gas input system, wherein, also comprise interconnective adsorbent equipment, desorption apparatus, compress and liquefy device and storage device; Described adsorbent equipment is adsorbent equipment more than one-level, and described desorption apparatus is desorption apparatus more than one-level; Realize multistage adsorption-desorption and compressed and liquefied the circulating recovery processing technique combining by this system.But, the method has not only increased the floor space of system, the complexity of system and the investment cost of system are increased, a set of vacuum desorption system and condenser system are for example increased, owner investment expense is obviously increased, and can not effectively increase the oil gas recovery rate of system, be not suitable for applying.
Therefore, exploitation one can not only multistage absorption oil gas and system investment cost is low, floor space is little, the high oil gas recovery processing system of organic efficiency to reducing enterprise investment, improve social environment and be of great importance.
Summary of the invention
The problem existing for prior art, the object of the present invention is to provide that a kind of investment cost is low, floor space is little, the rate of recovery much higher level absorption type oil gas recovery processing system and recovery processing technique thereof.
One of technical scheme of the present invention, be to provide a kind of multistage absorption type oil gas recovery processing system, comprise interconnective device for recovering oil and gas, two-stage adsorbent equipment, pressure-swing desorption desorption apparatus, Poor oil absorbing EGR, and described device for recovering oil and gas comprises blower fan and lime set surge tank; Described first order adsorbent equipment comprises two adsorption tanks that are filled with active carbon, second level adsorbent equipment comprises adsorption tanks that are filled with NACF or active carbon, and in two-stage adsorbent equipment, the transformation desorption flow process of three adsorption tanks shares a set of transformation desorption apparatus.
Preferably, the bottom of described first order adsorbent equipment is connected with the top of absorption cycle apparatus, one-level adsorbent equipment, the top of secondary absorption device respectively with valve by pipeline.
Preferably, described transformation desorption apparatus comprises one or more dry vacuum pump, and the work of described dry vacuum pump variable ratio frequency changer.
Two of technical scheme of the present invention, is to provide a kind of multistage absorption type oil gas recovery processing technique, comprises the steps:
(1) oil gas input
The oil gas of collection is sent into lime set surge tank through air blast, then enter the entrance of oil gas recovery place system;
(2) oil gas absorption
Oil gas absorption is divided into following two kinds of situations:
A, oil gas, after a wherein adsorption tanks absorption of first order adsorbent equipment, then enter second level adsorbent equipment adsorption treatment, then discharge through outlet;
When B, second level adsorption tanks desorb, two adsorption tanks series connection of first order adsorbent equipment become two-stage adsorbent equipment;
(3) adsorption tanks desorb
Two-stage adsorbent equipment shares a set of dry vacuum pump desorption system, and in the situation that second level adsorbent equipment adsorption capacity surplus capacity is larger, dry vacuum pump is alternately separated adsorption desorption flow process mainly for two adsorption tanks of the first order;
Reach in control system setup parameter situation at second level charcoal canister outlet concentration value, and now two of the first order adsorption tanks wherein one in absorption work, another is in the time of state upon adsorption, and dry vacuum pump is separated adsorption desorption flow process for second level adsorption tanks;
(4) oil gas absorbing process
The oil gas that vavuum pump desorption goes out is entered by lower end, absorption tower, simultaneously oil-poorly deliver to upper end, absorption tower by oil-feed pump and enter absorption tower and from top to bottom spray operation, after absorbing with the air-fuel mixture that enters absorption tower from bottom to top, be delivered to oil storage tank by scavenge oil pump, wherein in absorption tower, do not returned to oil gas porch by the small part oil gas of Poor oil absorbing by secondary oil gas return line and carry out again adsorption treatment.
Preferably, the duty of two adsorption tanks of the first order is the cyclic process of absorption-desorption-upon adsorption-absorption, and the duty of second level adsorption tanks is the cyclic process of absorption-desorption-absorption.
Further illustrate as follows.
Described oil gas adsorbent equipment front end is connected with lime set surge tank, lime set surge tank front end is connected with blower fan, blower fan import connects the airtight admission line of dispatching a car, wherein blower fan Main Function is the oil gas of collecting by the airtight system volatilization of dispatching a car, can enter smoothly gas recovery system for oil, and be unlikely to make most of oil gas to be dispatched a car in the entered environment of region airtight, thereby make gas recovery system for oil play the function that reclaims oil gas.And lime set surge tank Main Function is the liquid gasoline that due to variations in temperature, oil-gas-liquid eliminate indigestion is deposited in collection conduit.
Adopt two-stage adsorbent equipment, two adsorption tanks of the first order are absorption alternately, the work of second level absorption oil gas is mainly completed by adsorption tanks, and the state of two adsorption tanks of the first order is the cyclic process of absorption-desorption-upon adsorption-absorption, and the state of second level adsorption tanks is the cyclic process of absorption-desorption-absorption.In normal workflow situation, two absorbent charcoal adsorption tanks of first order adsorbent equipment alternately adsorb the oil gas of access to plant, after first order absorption, most of oil gas is adsorbed by first order charcoal canister, the a small amount of oil gas not being adsorbed enters second level oil gas adsorbent equipment, because the gas concentration value that enters second level entrance greatly reduces, thereby the relative adsorption capacity of second level adsorption tanks is enhanced, the a small amount of oil gas not being adsorbed is further thoroughly absorbed, thereby greatly reduces oil gas discharge rate.
In the second level, oil gas outlet is provided with concentration analyzer, if exit concentration sets value higher than control system, and now two of the first order adsorption tanks wherein one in absorption work, another is in the time of state upon adsorption, dry vacuum pump is separated adsorption desorption work for second level adsorption tanks device, by setting the folding of related valve and closing the tandem working that realizes two adsorbent equipments, thereby avoid adsorbing in saturated situation because of second level adsorption tanks, be unlikely to the normal operation of the system that affects, in system running, all the time there is two-stage oil gas adsorbent equipment to adsorb.
Further illustrate, when separate adsorption desorption work for second level adsorption tanks, need technical staff to consider the factor such as device disposal ability and vavuum pump desorption ability and determine suitable parameter value.
In sum, multistage absorption type oil gas recovery processing system of the present invention and recovery processing technique thereof have the following advantages:
1. compared with other condensation+absorption or multi-stage condensing oil gas recovery processing system, the present invention only increases the cost of adsorption tanks and active carbon, and cost of investment is obviously less; In addition, two-stage adsorbent equipment shares a set of pressure-swing desorption desorption apparatus, the also corresponding cost of investment that reduced;
2. the bottom of first order adsorbent equipment is connected with the top of absorption cycle apparatus, one-level adsorbent equipment, the top of secondary absorption device respectively with valve by pipeline, can carry out easily flow process switching, three adsorption tanks are resolved on demand and can not affect adsorption operations;
2. collect the oil gas of the airtight volatilization of dispatching a car through blower fan, make the real effect of device for recovering oil and gas performance, further improved the rate of recovery.
Brief description of the drawings
Fig. 1 is the process chart of a preferred embodiment of a kind of multistage absorption type oil gas recovery processing system of the present invention;
Fig. 2 be the present invention only under adsorbed state, process chart when two-stage adsorbent equipment normal sorption oil gas; .
Fig. 3 is a wherein adsorption tanks absorption of first order adsorbent equipment of the present invention, process chart when another adsorption tanks carry out desorb, and now second level adsorption tanks are simultaneously in adsorbed state;
Fig. 4 is the schematic flow sheet in the relative situation of Fig. 3;
Fig. 5 is that two adsorption tanks of the first order of the present invention are composed in series the absorption of two-stage adsorption tanks, and the process chart of second level adsorption tanks in the time of desorb;
Fig. 6 is another kind of process chart in the relative situation of Fig. 5.
In figure, 1, blower fan; 2, lime set surge tank; 3, motor-driven valve MOV101; 4, motor-driven valve MOV102; 5, motor-driven valve MOV103; 6, motor-driven valve MOV104; 7, motor-driven valve MOV105; 8, motor-driven valve MOV106; 9, adsorption tanks D101; 10, adsorption tanks D102; 11, motor-driven valve MOV107; 12, motor-driven valve MOV110; 13, motor-driven valve MOV108; 14, motor-driven valve MOV109; 15, adsorption tanks D103; 16, motor-driven valve MOV111; 17, dry vacuum pump; 18, absorption tower T301; 19, scavenge oil pump; 20, oil-feed pump; 21, motor-driven valve MOV302; 22, motor-driven valve MOV304; 23, oil storage tank; 24, online concentration detector.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
The process chart of one preferred embodiment of a kind of multistage absorption type oil gas recovery processing system of Fig. 1 the present invention.In figure, the oil gas of being collected by 1 blower fan enters oil gas adsorbent equipment after 2 lime set surge tanks.Adsorbent equipment has two-stage, and wherein the first order is made up of 9 adsorption tanks D101 and 10 adsorption tanks D102, and second level adsorbent equipment is 15 adsorption tanks D103.Oil gas, after the absorption of two-stage adsorption tanks, is finally discharged through outlet.
The charcoal canister adsorbing after saturated vacuumizes flow process by 17 dry vacuum pumps.By the folding of control system control associated electrical movable valve with close, 17 dry vacuum pumps vacuumize operation for a certain charcoal canister, and the oil gas under desorption is pumped to 18 lower ends, absorption tower by 17 dry vacuum pumps and enters 18 inside, absorption tower; Meanwhile, 21 motor-driven valve MOV302 and 22 motor-driven valve MOV304 open, 20 oil-feed pumps and the operation of 19 scavenge oil pumps." oil-poor " is pumped to 18 tops, absorption tower by 20 oil-feed pumps and from top to bottom sprays operation, absorbs after becoming " rich oil " and is pumped to 23 tank dilutions by 19 scavenge oil pumps with the air-fuel mixture that enters 18 absorption towers from bottom to top.Meanwhile, unabsorbed a small amount of oil gas returns to oil gas arrival end by 18 tops, absorption tower through secondary oil gas return line and is again adsorbed.
With reference to Fig. 2 for only under adsorbed state, process chart when two-stage adsorbent equipment normal sorption oil gas.
In the time of the duty with reference to shown in Fig. 2,9 adsorption tanks D101 and the 15 adsorption tanks D103 state in absorption oil gas, and 10 adsorption tanks D103 are in state upon adsorption.Now 3 motor-driven valve MOV101,11 motor-driven valve MOV107,14 motor-driven valve MOV109,16 motor-driven valve MOV111 are in open mode, and other all motor-driven valves are in closed condition.17 dry vacuum pumps, 19 scavenge oil pumps and 20 oil-feed pumps are in run-stopping status.Oil gas is by path as shown in reference to Fig. 2 thick lines, and after absorbing through two-stage adsorption tanks, the gas concentration value of discharging through outlet is significantly less than the concentration value that other oil gas recycling technology are discharged.Under this operating mode, oil gas major part is adsorbed by the first order 9 charcoal canister D101, and small part oil gas is adsorbed by the second level 15 charcoal canister D103.
Be a wherein adsorption tanks absorption of first order adsorbent equipment with reference to Fig. 3, process chart when another adsorption tanks carry out desorb, now second level adsorption tanks are simultaneously in adsorbed state.
In the time of the duty with reference to shown in Fig. 3,9 adsorption tanks D101 and the 15 adsorption tanks D103 state in absorption oil gas, and 10 adsorption tanks D103 are in desorption state.Now 3 motor-driven valve MOV101,6 motor-driven valve MOV104,11 motor-driven valve MOV107,14 motor-driven valve MOV109,16 motor-driven valve MOV111,21 motor-driven valve MOV302,22 motor-driven valve MOV304 are in open mode, and other all motor-driven valves are in closed condition.17 dry vacuum pumps, 19 scavenge oil pumps and 20 oil-feed pumps are in running status, and oil gas moves towards path as with reference in Fig. 3 as shown in thick lines.
Fig. 4 is the schematic flow sheet in the relative situation of Fig. 3.
Now, 10 adsorption tanks D102 and the 15 adsorption tanks D103 state in absorption oil gas, and 9 adsorption tanks D101 are in desorption state.
Fig. 5 is that two adsorption tanks of the first order are composed in series the absorption of two-stage adsorption tanks, and the process chart of second level adsorption tanks in the time of desorb.As shown in the figure, if exit concentration sets value higher than control system, and now two of the first order adsorption tanks wherein one in absorption work, another is in the time of state upon adsorption, 17 dry vacuum pumps are separated adsorption desorption work for second level adsorption tanks device.Now 1 motor-driven valve MOV101,11 motor-driven valve MOV107,13 motor-driven valve MOV108,8 motor-driven valve MOV106,12 motor-driven valve MOV110,21 motor-driven valve MOV302 and 22 motor-driven valve MOV304 are in open mode, and other motor-driven valves are in closed condition.17 dry vacuum pumps, 19 scavenge oil pumps and 20 oil-feed pumps are in running status, and oil gas moves towards path as with reference in Fig. 5 as shown in thick lines.
Two adsorption tanks of the first order have three kinds of cycle of states to carry out, i.e. absorption-desorption desorption-upon adsorption-absorption; And second level adsorption tanks are mainly divided into two states, i.e. absorption-desorption desorption-absorption.Second level adsorption tanks are mostly in the larger state of adsorption capacity surplus capacity, to ensure that outlet gas concentration greatly reduces.
Fig. 6 is another kind of process chart in the relative situation of Fig. 5, now 4 motor-driven valve MOV102,13 motor-driven valve MOV108,11 motor-driven valve MOV107,7 motor-driven valve MOV105,12 motor-driven valve MOV110,21 motor-driven valve MOV302 and 22 motor-driven valve MOV304 are in open mode, other motor-driven valves are in closed condition, 17 dry vacuum pumps, 19 scavenge oil pumps and 20 oil-feed pumps are in running status, and oil gas moves towards path as with reference in Fig. 6 as shown in thick lines.
Embodiment 1
The oil gas that certain oil depot produces in hair oil process carries out adsorption treatment according to flow process shown in Fig. 1.According to the porch of mensuration adsorbent equipment and the NMHC content (in propane) in exit of GB/T10628-1989 gas analysis normal mixture body composition, the results are shown in Table 1.
Table 1
| Time | Porch NMHC content (in propane) g/m 3 | Time | Exit NMHC content (in propane) g/m 3 |
| 10:00 | 532 | 10:01 | 0.17 |
| 11:00 | 468 | 11:01 | 0.09 |
| 12:00 | 564 | 12:01 | 0.06 |
| 13:00 | 518 | 13:01 | 0.13 |
| 14:00 | 489 | 14:01 | 0.10 |
Can be found out by data in table, the gas that discharge in adsorbent equipment exit meets the requirement of GB GB20950-2007 " storage tank farm atmosphere pollutants emission standards " completely.
The invention is not restricted to above-mentioned embodiment, those skilled in the art make for any apparent improvement of above-mentioned embodiment or change, can not exceed the protection domain of design of the present invention and claims.
Claims (5)
1. a multistage absorption type oil gas recovery processing system, comprises interconnective device for recovering oil and gas, two-stage adsorbent equipment, pressure-swing desorption desorption apparatus, Poor oil absorbing EGR, it is characterized in that,
Described device for recovering oil and gas comprises blower fan and lime set surge tank;
Described first order adsorbent equipment comprises two adsorption tanks that are filled with active carbon, second level adsorbent equipment comprises adsorption tanks that are filled with NACF or active carbon, and in two-stage adsorbent equipment, the transformation desorption flow process of three adsorption tanks shares a set of transformation desorption apparatus.
2. multistage absorption type oil gas recovery processing system according to claim 1, it is characterized in that, described first order adsorbent equipment is made up of two charcoal canisters, second level adsorbent equipment is made up of at least one charcoal canister, and the bottom of one-level adsorbent equipment is connected with the top of device for recovering oil and gas entrance, absorption cycle apparatus, one-level adsorbent equipment, the top of secondary absorption device respectively with valve by pipeline.
3. multistage absorption type oil gas recovery processing system according to claim 1, is characterized in that, described transformation desorption apparatus comprises one or more dry vacuum pump, and the work of described dry vacuum pump variable ratio frequency changer.
4. a technique of utilizing the multistage absorption type oil gas recovery processing system described in claim 1 to recycle oil gas, is characterized in that, comprises the steps:
(1) oil gas input
The oil gas of collection is sent into lime set surge tank through air blast, then enter the entrance of oil gas recovery place system;
(2) oil gas absorption
Oil gas absorption is divided into following two kinds of situations:
A, oil gas, after a wherein adsorption tanks absorption of first order adsorbent equipment, then enter second level adsorbent equipment adsorption treatment, then discharge through outlet;
When B, second level adsorption tanks desorb, two adsorption tanks series connection of first order adsorbent equipment become two-stage adsorbent equipment;
(3) adsorption tanks desorb
Two-stage adsorbent equipment shares a set of dry vacuum pump desorption system, and in the situation that second level adsorbent equipment adsorption capacity surplus capacity is larger, dry vacuum pump is alternately separated adsorption desorption flow process mainly for two adsorption tanks of the first order;
Reach in control system setup parameter situation at second level charcoal canister outlet concentration value, and now two of the first order adsorption tanks wherein one in absorption work, another is in the time of state upon adsorption, and dry vacuum pump is separated adsorption desorption flow process for second level adsorption tanks;
(4) oil gas absorbing process
The oil gas that vavuum pump desorption goes out is entered by lower end, absorption tower, simultaneously oil-poorly deliver to upper end, absorption tower by oil-feed pump and enter absorption tower and from top to bottom spray operation, after absorbing with the air-fuel mixture that enters absorption tower from bottom to top, be delivered to oil storage tank by scavenge oil pump, wherein in absorption tower, do not returned to oil gas porch by the small part oil gas of Poor oil absorbing by secondary oil gas return line and carry out again adsorption treatment.
5. multistage absorption type oil gas recovery processing technique according to claim 3, it is characterized in that, the duty of two adsorption tanks of the first order is the cyclic process of absorption-desorption-upon adsorption-absorption, and the duty of second level adsorption tanks is the cyclic process of absorption-desorption-absorption.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106166399A (en) * | 2016-07-29 | 2016-11-30 | 泉州市天龙环境工程有限公司 | A kind of device for recovering oil and gas and method |
| CN107961642A (en) * | 2017-12-01 | 2018-04-27 | 河北东厚环保科技有限公司 | Gas recovery system for oil based on high throughput nanometer adsorbent bed |
| CN107970747A (en) * | 2017-12-01 | 2018-05-01 | 河北东厚环保科技有限公司 | Can remote monitoring oil gas automation recovery system |
| CN109999602A (en) * | 2019-03-15 | 2019-07-12 | 湖北楚天蓝环保设备工程有限公司 | A kind of Petrochemical Enterprises VOCs recycling and processing device and processing method |
| CN112275089A (en) * | 2020-10-15 | 2021-01-29 | 河南中烟工业有限责任公司 | Effluent disposal polluted gas purification system |
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| CN102266701A (en) * | 2011-03-23 | 2011-12-07 | 中国石油天然气股份有限公司 | Method for treating waste gas in chemical acrylamide production |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106166399A (en) * | 2016-07-29 | 2016-11-30 | 泉州市天龙环境工程有限公司 | A kind of device for recovering oil and gas and method |
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| CN107970747A (en) * | 2017-12-01 | 2018-05-01 | 河北东厚环保科技有限公司 | Can remote monitoring oil gas automation recovery system |
| CN107970747B (en) * | 2017-12-01 | 2021-01-29 | 河北东厚环保科技有限公司 | Oil gas automatic recovery system capable of being remotely monitored |
| CN109999602A (en) * | 2019-03-15 | 2019-07-12 | 湖北楚天蓝环保设备工程有限公司 | A kind of Petrochemical Enterprises VOCs recycling and processing device and processing method |
| CN112275089A (en) * | 2020-10-15 | 2021-01-29 | 河南中烟工业有限责任公司 | Effluent disposal polluted gas purification system |
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Application publication date: 20140723 |