CN102940974B - 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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- CN102940974B CN102940974B CN201210439919.1A CN201210439919A CN102940974B CN 102940974 B CN102940974 B CN 102940974B CN 201210439919 A CN201210439919 A CN 201210439919A CN 102940974 B CN102940974 B CN 102940974B
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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 economic fast development, 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, is mixed to form oil gas with air.Lighter hydrocarbons volatilization causes serious oil product evaporating loss, and a large amount of oil gas is directly discharged into atmosphere, has brought serious potential safety hazard, environmental pollution, therefore to the light hydrocarbon component in oil gas, reclaims significant.
Increasing country has formulated legal norm mandatory requirement and has implemented oil gas processing, and oil gas treatment system must be installed in new national Specification oil storage and transportation place by China, and regulation concentration of oil and gas discharged is the NMHC content≤25g/m of tail gas
3.Condensation method Investigation of Petroleum Vapor Recovery Technology utilizes cascade refrigeration circulation to produce low temperature exactly, reduces by stages oil gas temperature, and light hydrocarbon component is wherein condensed into the technical matters that liquid is reclaimed.
In the refrigerating method of existing oil gas condensation reclaimer, due to the different oil-gas condenser of a plurality of temperature of needs, be generally each oil-gas condenser a set of 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 manufacture and operating cost are high.And to reach the concentration of oil and gas discharged of national regulation, and afterbody oil-gas condenser need to reach the low temperature of-110 ℃, generally adopts three cascade refrigeration systems to provide cold for it, and three cascade refrigeration systems are more complicated, consume energy also high.
Summary of the invention
The object 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 contributes to simplify refrigeration system, reduces oil gas condensation recovery system and manufactures and operating cost, reduces system energy consumption simultaneously.
The refrigerating method reclaiming for oil gas condensation of the present invention, adopts mix refrigerant circulation to provide cold for oil gas condensation process.Mix refrigerant by several high temperature, in the configuration of gentle low-temperature refrigerant form, as R134a/R23/R14, low-temperature refrigerant wherein be necessary component, whether all the other components need to show oil-gas component and determine.In mix refrigerant, each constituent mass proportioning is different and different with oil gas composition.Utilize the boiling point of each component in mix refrigerant different, can realize condensation, throttling, evaporation step by step, obtain the refrigerating capacity of different temperatures level, to reach the progressively object 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 mix refrigerant circulation, compressor outlet mix refrigerant gas is after condenser, successively by heat exchangers at different levels and gas-liquid separator.It is different that gas-liquid separator makes to enter refrigerant component in heat exchangers at different levels, the evaporating temperature corresponding to cold-producing medium of different component, so heat exchanger at different levels can provide the refrigerating capacity of different temperatures level, thus condensation vaporizing oil-gas progressively.
In oil gas circulation, oil gas is successively by heat exchangers at different levels, and the oil gas that in heat exchangers at different levels, condensation goes out, enters cold oil pipeline and converge, and 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, after its cold is fully utilized, enters atmosphere.
Utilize the device for recovering oil and gas of the method can be divided into compressor unit and two of ice chest unit part.Wherein compressor unit belongs to ambient operation part, comprises mix refrigerant compressor, condenser and one-level gas-liquid separator.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. three grades of employings in the past or two-stage multiplex refrigerating circulation, need to arrange separately a set of 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 in 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, throttling, raw material oil gas, uncooled oil gas, adopt Heat Exchangers to make system flow 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, in heat exchangers at different levels, cold fluid and hot fluid temperature are more mated, and have reduced system energy consumption.
Accompanying drawing explanation
Fig. 1 is the oil gas condensation recovery process figure that utilizes mix refrigerant circulation of the present invention
In Fig. 1: 1 is first-class heat exchanger, 2 is secondary heat exchanger, and 3 is three grades of heat exchangers, and 4 is mix refrigerant compressor, and 5 is condenser, and 6 is one-level gas-liquid separator, and 7 is secondary gas-liquid separator, and 8 is one-level choke valve, and 9 is 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 compressor unit and two of ice chest unit part.Wherein compressor unit comprises mix refrigerant compressor 4, condenser 5, one-level gas-liquid separator 6; 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
Mix refrigerant kind of refrigeration cycle comprises: mix refrigerant compressor 4 exit gas are after condenser 5, enter one-level gas-liquid separator 6, after separated, the liquid phase refrigerant of primary separator 6 bottoms stream thigh enters first-class heat exchanger 1, after heat exchange, by one-level choke valve 8, after throttling, this stream thigh is back in first-class heat exchanger 1 cold is provided; The vapor phase refrigerant stream thigh at one-level gas-liquid separator 6 tops enters first-class heat exchanger 1, after heat exchange, enter secondary gas-liquid separator 7, the liquid phase refrigerant of second-stage separator 7 bottoms after separation enters secondary heat exchanger 2, after heat exchange, by two-step throttle valve 9, after throttling, this stream strand oppositely enters secondary heat exchanger 2 more successively, first-class heat exchanger 1 provides cold; The vapor phase refrigerant at secondary gas-liquid separator 7 tops enters secondary heat exchanger 2, three grades of heat exchangers 3, and after heat exchange, again by three grades of choke valves 10, after throttling, this stream strand oppositely enters successively three grades of heat exchangers 3, secondary heat exchanger 2, first-class heat exchanger 1 again cold is provided.Through the mix refrigerant after three grades, secondary, first-class heat exchanger, enter mix refrigerant compressor 4 compressed.
Oil gas circulation comprises: it is cooling that oil gas is introduced into first-class heat exchanger 1, 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, 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, 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, from first-class heat exchanger 1, enters atmosphere.The oil gas that heat exchanger condensations at different levels go out, enters cold oil pipeline and converges, and forms liquid condensation oil discharge system.
Embodiment: certain the petrochemical plant entrucking oil gas described in his-and-hers watches 1 adopts the inventive method to carry out condensation recovery, 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 ℃)
| Component title | Volume fraction (%) | 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 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 compressor adiabatic efficiency is 0.85, by flowsheeting, calculates systematic function.System minimum operating temperature can reach-110 ℃, and oil gas is discharged NMHC content in oil gas after condensation process can reach 10g/m
3, lower than GB requirement, it is 0.131kW.h that every side's oil gas is processed power consumption.
Claims (1)
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, mix refrigerant kind of refrigeration cycle is, mix refrigerant compressor (4) exit gas is after condenser (5), enter one-level gas-liquid separator (6), after separated, the liquid phase refrigerant stream thigh of primary separator (6) bottom enters first-class heat exchanger (1), after heat exchange, by one-level choke valve (8), after throttling, this stream thigh is back in first-class heat exchanger (1) cold is provided; The vapor phase refrigerant stream thigh at one-level gas-liquid separator (6) top enters first-class heat exchanger (1), after heat exchange, enter secondary gas-liquid separator (7), the liquid phase refrigerant of the second-stage separator after separation (7) bottom enters secondary heat exchanger (2), after heat exchange, by two-step throttle valve (9), after throttling, this stream strand oppositely enters secondary heat exchanger (2) more successively successively, first-class heat exchanger (1) provides cold; The vapor phase refrigerant at secondary gas-liquid separator (7) top enters secondary heat exchanger (2), three grades of heat exchangers (3) successively, after heat exchange, again by three grades of choke valves (10), after throttling, this stream strand oppositely enters three grades of heat exchangers (3), secondary heat exchanger (2) and first-class heat exchanger (1) more successively provides cold; It is compressed that mix refrigerant after three grades of heat exchangers (3), secondary heat exchanger (2) and first-class heat exchanger (1) enters mix refrigerant compressor (4);
Oil gas circulates, and it is cooling that oil gas is introduced into first-class heat exchanger (1), 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, 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, 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), from first-class heat exchanger (1), enters atmosphere; The oil gas that heat exchanger condensations at different levels go out, enters cold oil pipeline and converges, and forms liquid condensation oil discharge system; Described first-class heat exchanger (1), secondary heat exchanger (2) and three grades of heat exchangers (3) are Heat Exchangers.
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| 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 |
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| 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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|---|---|---|---|---|
| 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
- 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 |
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Granted publication date: 20141203 Termination date: 20171107 |