CN102940974A - Oil gas condensation and recovery method by using mixed refrigerant cycle - Google Patents
Oil gas condensation and recovery method by using mixed refrigerant cycle Download PDFInfo
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- CN102940974A CN102940974A CN2012104399191A CN201210439919A CN102940974A CN 102940974 A CN102940974 A CN 102940974A CN 2012104399191 A CN2012104399191 A CN 2012104399191A CN 201210439919 A CN201210439919 A CN 201210439919A CN 102940974 A CN102940974 A CN 102940974A
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Abstract
The invention relates to an oil gas condensation and recovery method by using a mixed refrigerant cycle. The oil gas condensation and recovery method by using the mixed refrigerant cycle comprises the mixed refrigerant cycle and an oil gas cycle. The mixed refrigerant cycle comprises a compressor, a condenser, heat exchangers at different temperature stages, throttling valves at different temperature stages and gas-liquid separators at different temperature stages. Oil gas sequentially passes through the heat exchangers at different stages for condensation and recovery. After uncondensed low-temperature oil gas which is remained at the output of the last-stage heat exchanger is reversely fed the heat exchangers at different stages and the cold energy of the oil gas is recovered, the remaining part is emitted into the atmosphere. Only one compressor is needed for the entire system. The heat exchangers at different temperature stages are multi-flow heat exchangers. The oil gas condensation and recovery method by using the mixed refrigerant cycle has the beneficial effects the process flow is simple, the unit equipment is fewer and the manufacturing cost is reduced; and the temperature of cold fluid and the temperature of hot fluid in the heat exchangers are better matched, and the energy consumption of the system is reduced.
Description
Technical field
The present invention relates to a kind of condensation recycling method of oil gas that utilizes mixed refrigerant circulation, can be applicable to the recovery of the volatility oil gas of the occasions such as gas station, oil depot and oil field, also can be used for the recovery of other volatile substances steam.
Background technology
Along with the fast development of economy, the China's refined oil consumption increases severely, the also corresponding increase of oil depot, gas station's quantity and scale.The oil products such as gasoline contain a large amount of light hydrocarbon components, and boiling point is low, high volatility, and in storage and transport process, some light hydrocarbon component is vaporized and is escaped into atmosphere, with air mixed-shaped olefiant gas.The lighter hydrocarbons volatilization causes serious oil product evaporating loss, and a large amount of oil gas directly are discharged into atmosphere, have brought serious potential safety hazard, environmental pollution, therefore reclaim significant to the light hydrocarbon component in the oil gas.
Increasing country has formulated the legal norm mandatory requirement and has implemented the oil gas processing, and the oil gas treatment system must be installed in new national standard regulation oil storage and transportation place by China, and the regulation concentration of oil and gas discharged is the NMHC content≤25g/m of tail gas
3The condensation method Investigation of Petroleum Vapor Recovery Technology utilizes cascade refrigeration circulation to produce low temperature exactly, reduces by stages the oil gas temperature, and wherein light hydrocarbon component is condensed into the technical matters that liquid is reclaimed.
In the refrigerating method of existing oil gas condensation reclaimer, owing to needing the different oil-gas condenser of a plurality of temperature, be generally each oil-gas condenser one cover refrigeration system is set separately, gas recovery system for oil just need to arrange many cover refrigeration system coolings so, system is comparatively huge, and manufacturing and operating cost are high.And to reach the concentration of oil and gas discharged of national regulation, and the afterbody oil-gas condenser need to reach-110 ℃ low temperature, generally adopts three cascade refrigeration systems to provide cold for it, and three cascade refrigeration systems are complicated, consume energy also high.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, propose a kind of condensation recycling method of oil gas that utilizes mixed refrigerant circulation, the method helps to simplify refrigeration system, reduces the oil gas condensation recovery system and makes and operating cost, reduces simultaneously system energy consumption.
Refrigerating method for the oil gas condensation recovery of the present invention adopts the mix refrigerant circulation to provide cold for the oil gas condensation process.Mix refrigerant is formed by several high temperature, middle gentle low-temperature refrigerant configuration, as: R134a/R23/R14, low-temperature refrigerant wherein are necessary component, and whether all the other components need to show oil-gas component and decide.Each constituent mass proportioning is different and different with the oil gas composition in the mix refrigerant.Utilize the boiling point of each component in the mix refrigerant different, can realize step by step condensation, throttling, evaporation, obtain the refrigerating capacity of different temperatures level, to reach the progressively purpose of condensation vaporizing oil-gas.The condensation recycling method of oil gas of mix refrigerant circulation that utilizes of the present invention comprises mix refrigerant circulation and oil gas circulation two parts.
In the mix refrigerant circulation, compressor outlet mix refrigerant gas is through behind the condenser, successively by heat exchangers at different levels and gas-liquid separator.Gas-liquid separator is so that the refrigerant component that enters in the heat exchangers at different levels is different, the evaporating temperature that the cold-producing medium of different component is corresponding different, so heat exchanger at different levels can provide the refrigerating capacity of different temperatures level, thus condensation vaporizing oil-gas progressively.
In the oil gas circulation, by heat exchangers at different levels, the oil gas that condensation goes out in the heat exchangers at different levels enters the cold oil pipeline and converges oil gas successively, forms liquid condensation oil discharge system.The uncooled low temperature oil gas of final heat exchanger outlet oppositely enters heat exchangers at different levels successively, enters atmosphere after its cold is fully utilized.
Utilize the device for recovering oil and gas of the method can be divided into two parts of compressor unit and ice chest unit.Wherein compressor unit belongs to the ambient operation part, comprises mix refrigerant compressor, condenser and one-level gas-liquid separator.The ice chest cell mesh comprises cryogenic heat exchangers at different levels, low temperature gas-liquid separator at different levels and choke valve at different levels.
Beneficial effect:
1. in the past three grades of employings or two-stage multiplex refrigerating circulation need to arrange separately a cover refrigeration system for each oil-gas condenser, needs three or two compressors; The condensed oil-gas recovery system of employing mix refrigerant circulation of the present invention only needs a compressor, and system flow is simple, and unit equipment is few, low cost of manufacture.
2. other heat exchanger of different temperatures level among the present invention is Heat Exchangers, the all heat exchange in this heat exchanger of low-pressure gaseous refrigerant after high-pressure gaseous refrigerant, high pressure liquid refrigerant, the throttling, raw material oil gas, uncooled oil gas, adopt Heat Exchangers so that system flow is simple, unit equipment is few, low cost of manufacture.
3. in the oil gas condensation recovery system of mix refrigerant circulation of the present invention, cold fluid and hot fluid temperature are more mated in the heat exchangers at different levels, have reduced system energy consumption.
Description of drawings
Fig. 1 is the oil gas condensation recovery process figure that utilizes the mix refrigerant circulation of the present invention
Among Fig. 1: 1 is first-class heat exchanger, and 2 is secondary heat exchanger, and 3 is three grades of heat exchangers, and 4 is the mix refrigerant compressor, and 5 is condenser, and 6 is the one-level gas-liquid separator, and 7 is the secondary gas-liquid separator, and 8 is the one-level choke valve, and 9 is the two-step throttle valve, and 10 is three grades of choke valves
The specific embodiment
As shown in Figure 1, the condensation recycling method of oil gas of mix refrigerant circulation that utilizes of the present invention comprises mix refrigerant circulation and oil gas circulation.Utilize the device for recovering oil and gas of the method can be divided into two parts of compressor unit and ice chest unit.Wherein compressor unit comprises mix refrigerant compressor 4, condenser 5, one-level gas-liquid separator 6; The ice chest unit comprises first- class heat exchanger 1,2, three grades of heat exchangers 3 of secondary heat exchanger, one-level choke valve 8,9, three grades of choke valves 10 of two-step throttle valve, secondary gas-liquid separator 7.First-class heat exchanger 1, secondary heat exchanger 2 and three grades of heat exchangers 3 are Heat Exchangers
The mix refrigerant kind of refrigeration cycle comprises: mix refrigerant compressor 4 exit gas are through behind the condenser 5, enter one-level gas-liquid separator 6, the liquid phase refrigerant of primary separator 6 bottoms stream thigh enters first-class heat exchanger 1 after separating, by one-level choke valve 8, this stream thigh is back in the first-class heat exchanger 1 cold is provided after the throttling after the heat exchange; The vapor phase refrigerant stream thigh at one-level gas-liquid separator 6 tops enters first-class heat exchanger 1, enter secondary gas-liquid separator 7 after the heat exchange, the liquid phase refrigerant of second-stage separator 7 bottoms after the separation enters secondary heat exchanger 2, by two-step throttle valve 9, this stream thigh oppositely enters secondary heat exchanger 2 more successively after the throttling, first-class heat exchanger 1 provides cold after the heat exchange; The vapor phase refrigerant at secondary gas-liquid separator 7 tops enters secondary heat exchanger 2, three grades of heat exchangers 3, and again by three grades of choke valves 10, should stream after the throttling strand oppositely entering successively three grades of heat exchangers 3, secondary heat exchanger 2, first-class heat exchanger 1 provides cold again after the heat exchange.Enter mix refrigerant compressor 4 through the mix refrigerant behind three grades, secondary, first-class heat exchanger compressed.
The oil gas circulation comprises: oil gas is introduced into first-class heat exchanger 1 cooling, and cooling rear section oil gas condensation is discharged first-class heat exchanger 1, and remaining uncooled oil gas continues to enter secondary heat exchanger 2; In secondary heat exchanger, the part oil gas condensation is discharged secondary heat exchanger 2, remains uncooled oil gas and continues to enter three grades of heat exchangers 3; In three grades of heat exchangers, the part oil gas condensation is discharged three grades of heat exchangers 3, remains uncooled oil gas and oppositely enters successively three grades, secondary, first-class heat exchanger, enters atmosphere from first-class heat exchanger 1.The oil gas that heat exchanger condensations at different levels go out enters the cold oil pipeline and converges, and forms liquid condensation oil discharge system.
Embodiment: his-and-hers watches 1 described certain petrochemical plant entrucking oil gas adopts the inventive method to carry out condensation and reclaims 35 ℃ of this gas mixture temperature, flow 30m
3/ h.
Certain petrochemical plant entrucking oil-gas component of table 1 and volume fraction (1atm, 35 ℃)
| The component title | Volume fraction (%) | The component title | Volume fraction (%) |
| Methane | 0.68 | Isopentane | 6 |
| Ethane | 1.24 | Pentane | 0.68 |
| Propane | 1.70 | N-hexane | 4.1 |
| Iso-butane | 8.7 | Nitrogen | 51.9 |
| Normal butane | 11.2 | Oxygen | 13.8 |
Adopt flow process shown in the accompanying drawing 1, get each constituent mass of mixed working fluid and compare R134a:R14=75:25.Getting system low-voltage pressure is 2bar, and high-pressure is 20bar, and the compressor adiabatic efficiency is 0.85, calculates systematic function by flowsheeting.System's minimum operating temperature can reach-110 ℃, and NMHC content can reach 10g/m to oil gas in the oil gas through discharging after the condensation process
3, being lower than the GB requirement, it is 0.131kW.h that every side's oil gas is processed power consumption.
Claims (2)
1. one kind is utilized the condensation recycling method of oil gas that mixes refrigerant circulation, it is characterized in that, comprise mix refrigerant circulation and oil gas circulation, the mix refrigerant kind of refrigeration cycle is, behind mix refrigerant compressor (4) the exit gas process condenser (5), enter one-level gas-liquid separator (6), the liquid phase refrigerant stream thigh of primary separator (6) bottom enters first-class heat exchanger (1) after separating, by one-level choke valve (8), this stream thigh is back in the first-class heat exchanger (1) cold is provided after the throttling after the heat exchange; The vapor phase refrigerant stream thigh at one-level gas-liquid separator (6) top enters first-class heat exchanger (1), enter secondary gas-liquid separator (7) after the heat exchange, the liquid phase refrigerant of the second-stage separator after the separation (7) bottom enters secondary heat exchanger (2), by two-step throttle valve (9), this stream thigh oppositely enters secondary heat exchanger (2) more successively successively after the throttling, first-class heat exchanger (1) provides cold after the heat exchange; The vapor phase refrigerant at secondary gas-liquid separator (7) top enters secondary heat exchanger (2), three grades of heat exchangers (3) successively, again by three grades of choke valves (10), this stream thigh oppositely enters three grades of heat exchangers (3), secondary heat exchanger (2) and first-class heat exchanger (1) more successively after the throttling provides cold after the heat exchange; Enter mix refrigerant compressor (4) through the mix refrigerant after three grades of heat exchangers (3), secondary heat exchanger (2) and the first-class heat exchanger (1) compressed;
Oil gas circulates, and oil gas is introduced into first-class heat exchanger (1) cooling, and cooling rear section oil gas condensation is discharged first-class heat exchanger (1), and remaining uncooled oil gas continues to enter secondary heat exchanger (2); In secondary heat exchanger, the part oil gas condensation is discharged secondary heat exchanger (2), remains uncooled oil gas and continues to enter three grades of heat exchangers (3); In three grades of heat exchangers, the part oil gas condensation is discharged three grades of heat exchangers (3), remains uncooled oil gas and oppositely enters successively three grades of heat exchangers (3), secondary heat exchanger (2) and first-class heat exchanger (1), enters atmosphere from first-class heat exchanger (1); The oil gas that heat exchanger condensations at different levels go out enters the cold oil pipeline and converges, and forms liquid condensation oil discharge system.
2. the condensation recycling method of oil gas of the mixed refrigerant circulation of utilization according to claim 1 is characterized in that, described first-class heat exchanger (1), secondary heat exchanger (2) and three grades of heat exchangers (3) are Heat Exchangers.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103463831A (en) * | 2013-09-18 | 2013-12-25 | 南京都乐制冷设备有限公司 | Oil gas recovery device at wharf |
| CN106215450A (en) * | 2016-08-29 | 2016-12-14 | 黎志春 | A kind of fragrance recovery method based on multi-stage condensing device |
| CN106267877A (en) * | 2016-08-29 | 2017-01-04 | 黎志春 | A kind of Maillard reaction fragrance recovery method based on ossein |
| CN106267878A (en) * | 2016-08-29 | 2017-01-04 | 黎志春 | A kind of fragrance recovery method |
| CN106377921A (en) * | 2016-08-29 | 2017-02-08 | 黎志春 | Method for recycling fragrance with multi-stage condenser |
| CN106693436A (en) * | 2015-11-13 | 2017-05-24 | 中国石化工程建设有限公司 | Tail gas treatment system for storage tank type material storage facilities |
| CN111228957A (en) * | 2020-02-13 | 2020-06-05 | 中国科学院理化技术研究所 | Mixed working medium oil gas VOCs low-temperature condensation recovery system |
| CN111895723A (en) * | 2019-05-06 | 2020-11-06 | 中国石化工程建设有限公司 | Separation device and separation method for reaction generated gas in propylene preparation through propane dehydrogenation |
| CN112791816A (en) * | 2020-11-02 | 2021-05-14 | 北京宏科庆能科技有限公司 | System and method for low-temperature crushing of rubber |
| CN113350959A (en) * | 2021-07-07 | 2021-09-07 | 陕西凯尔利尼冷冻空调有限公司 | Waste gas condensation recovery system using condensing unit and environment-friendly treatment method |
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| JPH0854184A (en) * | 1994-08-10 | 1996-02-27 | Keiji Nakaya | Method and apparatus for drying closed-type washer |
| CN2651190Y (en) * | 2003-10-19 | 2004-10-27 | 王建基 | Condenser oil and gas recovering apparatus |
| CN101852504A (en) * | 2010-05-14 | 2010-10-06 | 东南大学 | Double-stage cascade refrigeration method used for oil-gas recovery |
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- 2012-11-07 CN CN201210439919.1A patent/CN102940974B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0854184A (en) * | 1994-08-10 | 1996-02-27 | Keiji Nakaya | Method and apparatus for drying closed-type washer |
| CN2651190Y (en) * | 2003-10-19 | 2004-10-27 | 王建基 | Condenser oil and gas recovering apparatus |
| CN101852504A (en) * | 2010-05-14 | 2010-10-06 | 东南大学 | Double-stage cascade refrigeration method used for oil-gas recovery |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103463831A (en) * | 2013-09-18 | 2013-12-25 | 南京都乐制冷设备有限公司 | Oil gas recovery device at wharf |
| CN103463831B (en) * | 2013-09-18 | 2015-05-27 | 南京都乐制冷设备有限公司 | Oil gas recovery device at wharf |
| CN106693436A (en) * | 2015-11-13 | 2017-05-24 | 中国石化工程建设有限公司 | Tail gas treatment system for storage tank type material storage facilities |
| CN106215450A (en) * | 2016-08-29 | 2016-12-14 | 黎志春 | A kind of fragrance recovery method based on multi-stage condensing device |
| CN106267877A (en) * | 2016-08-29 | 2017-01-04 | 黎志春 | A kind of Maillard reaction fragrance recovery method based on ossein |
| CN106267878A (en) * | 2016-08-29 | 2017-01-04 | 黎志春 | A kind of fragrance recovery method |
| CN106377921A (en) * | 2016-08-29 | 2017-02-08 | 黎志春 | Method for recycling fragrance with multi-stage condenser |
| CN111895723A (en) * | 2019-05-06 | 2020-11-06 | 中国石化工程建设有限公司 | Separation device and separation method for reaction generated gas in propylene preparation through propane dehydrogenation |
| CN111895723B (en) * | 2019-05-06 | 2022-06-21 | 中国石化工程建设有限公司 | Separation device and separation method for reaction generated gas in propylene preparation through propane dehydrogenation |
| CN111228957A (en) * | 2020-02-13 | 2020-06-05 | 中国科学院理化技术研究所 | Mixed working medium oil gas VOCs low-temperature condensation recovery system |
| CN112791816A (en) * | 2020-11-02 | 2021-05-14 | 北京宏科庆能科技有限公司 | System and method for low-temperature crushing of rubber |
| CN113350959A (en) * | 2021-07-07 | 2021-09-07 | 陕西凯尔利尼冷冻空调有限公司 | Waste gas condensation recovery system using condensing unit and environment-friendly treatment method |
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| CN102940974B (en) | 2014-12-03 |
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