CN106621439A - Two-stage phase-change energy-storing oil gas recycling system and method - Google Patents
Two-stage phase-change energy-storing oil gas recycling system and method Download PDFInfo
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- CN106621439A CN106621439A CN201610963079.7A CN201610963079A CN106621439A CN 106621439 A CN106621439 A CN 106621439A CN 201610963079 A CN201610963079 A CN 201610963079A CN 106621439 A CN106621439 A CN 106621439A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0036—Multiple-effect condensation; Fractional condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0051—Regulation processes; Control systems, e.g. valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0087—Recirculating of the cooling medium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a two-stage phase-change energy-storing oil gas recycling system and method. The two-stage phase-change energy-storing oil gas recycling system comprises an oil gas recycling device and a refrigeration and cold storage device, wherein the oil gas recycling device comprises a primary oil gas condenser, a secondary oil gas condenser and a tertiary oil gas condenser which are connected in sequence, and is used for inputting the oil gas from the side inlet of the primary oil gas condenser, pre-cooling the oil gas through the primary oil gas condenser, the secondary oil gas condenser and the tertiary oil gas condenser in sequence, returning the pre-cooled oil gas to the primary oil gas condenser, and outputting the oil gas from the side outlet of the primary oil gas condenser; the refrigeration and cold storage device comprises a high-temperature-stage compressor, an air-cooling condenser and a high-temperature-stage throttling device; the high-temperature-stage compressor, the air-cooling condenser, the high-temperature-stage throttling device and the secondary oil gas condenser are connected in sequence to form a first circulation loop. In the two-stage phase-change energy-storing oil gas recycling system, two-stage energy storage is adopted, and the cold storage system with the secondary oil gas condenser is used for condensing the oil gas in a step form, so that the load of the tertiary oil gas condenser is lowered, the overall equipment power is lowered, more energy is saved than the single-stage cold storage scheme, and a refrigeration system becomes smaller.
Description
Technical field
The present invention relates to oil-gas recovery device field, more particularly to a kind of two-stage phase-changing energy-storing gas recovery system for oil and side
Method.
Background technology
At present gas station has all carried out compulsory petroleum vapor recovery transformation, and the gas station oil gas of state compulsion reclaim transformation to be included
Petroleum vapor recovery and secondary oil gas are reclaimed, and country temporarily does not force to carry out three petroleum vapor recoveries.
Petroleum vapor recovery refers to that the gas-liquid between oil tank tank car and gas station's buried tank (buried tank) is exchanged.
Groove tank car (is primarily referred to as the big gasoline of volatility) in the buried tank emptying to gas station, " empty " buried tank its
It is not in fact empty, oil gas has been expired in the inside storage, and the liquid oil in groove tank car flows into buried tank by Action of Gravity Field, in buried tank
The squeezed return-enclosure tank car of oil gas, completes once to reclaim, and makes oil gas be unlikely to be discharged toward air by breather valve.This is also people's custom
" the big breathing " for claiming.
The groove tank car of oil gas is filled when charge of oil is carried out next time to oil depot, the liquid oil of oil depot loads groove tank car, gas quilt
Introduce the collection of oil depot oil-gas recovery device and process to reach and discharge after environmental protection standard.
The oil-gas recovery device of wherein one time gas recovery system for oil and oil depot is all that state compulsion requirement is equipped with, but
According to during above flow process practical operation, the oil-gas recovery device of oil depot usually can not be recovered to oil from the oil gas of groove tank car, or
It is can only to be recovered to the oil than theoretical value much less.
Trace it to its cause, there are following several possibility：
1. after emptying terminates, whether some gas station operating personnel need hand inspection groove tank car to the groove tank car of gas station
Unsnatch, and open the top cover of groove tank car, cause groove tank in-car oil gas to be released into air；
2. the groove tank car for transporting oil to gas station may draw gasoline today, go tomorrow and be changed to draw diesel oil, and oil depot to oil depot
To the diesel oil trestle work of groove tank car charge of oil, oil-gas recovery device is not filled at all, and (petroleum vapor recovery to diesel oil, country does not also force
Require), so as to the petrol gas for causing groove tank in-car are run in vain into air；
3. groove tank car is not closed tight, and gas is more easy to because the change of temperature causes the drastically change of volume, groove tank than liquid
In-car oil gas can make the close of the positions such as the increase of groove tank car internal pressure, many groove tank car caping, detection mouth due to temperature change
Closing property is not tight, and groove tank car hauls the race of car load oil gas streetful, and when next time is to oil depot charge of oil, possible internal oil gas subtracts significantly
It is few.
4. many groove tank cars also do not download the transformation of oil, and top charge of oil mouth is not of uniform size, and oil depot oil filling riser is not
Groove tank car tank mouth can be carried out effectively closed, the oil-gas recovery device for causing oil depot is collected less than high-concentration oil vapor, affects oil depot
The yield of oil-gas recovery device.
For these reasons, it is if petroleum vapor recovery can directly be carried out in gas station's groove tank car emptying, high-concentration oil vapor is straight
Connect and become gasoline, on the one hand can increase gas station's benefit, be on the other hand conducive to environmental protection, change the in-car oil gas of present groove tank
In oil depot delay disposal far from the present situation for reaching desired effect.
For this reason, it is necessary to first say down that secondary oil gas are reclaimed and three petroleum vapor recoveries, it is that gas station exists that secondary oil gas are reclaimed
When refueling a car, the oil gas of oil gas and volatilization of refueling in automotive oil tank, from the gas circuit pipe of petroleum vapor recovery nozzle, by vacuum
Pumping returns buried tank (buried tank).
The oil gas of fuel tank volatilization is present escapes, and must suck back that a little just to can guarantee that oil gas is tried one's best few when reclaiming oil gas more
Escape, thus have partial air and be drawn back into, national regulations its vapour-liquid ratios is generally 1～1.2:1 (volume ratio).Due to sucking back
Oil gas more than the oily volume that adds to automobile, the pressure of buried tank can gradually rise, and high breather valve to a certain extent will be beaten
Pressure release is opened, exhaust of oil is made in air, and when temperature step-down, gas volume reduces in buried tank, and pressure step-down causes to exhale
Inhale valve and open suction air, balance the pressure of buried tank.This is also " the little breathing " being commonly called as.
So, buried tank now, just will must be installed as oil depot oil gas when oil gas is breathed out to environment
The equipment that reclaimer can make like that oil gas qualified discharge, rather than only carry out VLE.Such equipment and reclaimed
Journey is referred to as three petroleum vapor recoveries of gas station.
Three petroleum vapor recoveries of gas station are to suck gas when solving buried tank due to temperature change or secondary recovery
Cause emission problem during pressure rise, general treating capacity is all very little, between 1NM3/h～5NM3/h.
And during gas station's emptying, a general groove tank vehicle volume is 30～60 cubic metres, whole emptying process is typically one
Hour or so is completed, that is, the oil and gas content for producing is about 30～60Nm3/h, if therefore to gas station's emptying fashionable dress as three oil gas time
Such equipment is received, needs 30 to amplify 30 times or so the requirements that could meet petroleum vapor recovery process in other words, it is clear that this is not
It is economical, therefore, except daily can emptying up to gas stations more than 3 cars, some gas station owners install for economic benefit
Outside the oil-gas recovery processing device crossed as the petroleum vapor recovery of three petroleum vapor recoveries or oil depot, people is there is presently no specially right
Petroleum vapor recovery during gas station's emptying is optimized design.
For the gas station in the whole nation more than 90%, it is daily, or per couple of days only one of which groove tank car emptying, often
About hour of secondary emptying, like this, by taking the petroleum vapor recovery processing equipment for filling a set for the treatment of capacity 50Nm3/h as an example, market
Valency is about 30～600,000, even if every time emptying can reclaim 200 yuan or so of oil, the cycle of its cost recovery is also very
Long.Because the interval time that gas station oil gas reclaimer is used every time is very long, capacity utilization was low, per 24～72 hours
Using within only one hour, other times are all idle, for this purpose, the side that my invention's this set energy-storage type petroleum vapor recovery is processed
Method, can with 10～48 hours come slowly energy storage, little breathing discharge can also be simultaneously processed during accumulation of energy, and in groove tank car emptying
A large amount of energy process oil gas are discharged, to greatly reduce one-time investment cost, so as to promote gas station's emptying oil-gas recovery device
Popularization.
It is illustrated in figure 1 the petroleum vapor recovery of gas station of the prior art a time (loading onto before energy-storage type petroleum vapor recovery) connection
Schematic diagram, the main emptying process of an existing petroleum vapor recovery：During RTC unloading, close stop valve V1, open stop valve V3 and
Stop valve V5, liquid oil flows into buried oil storage tank through stop valve V5, and the oil gas in buried oil storage tank passes through stop valve
V3 returns oil truck.
The solution of the present invention is the improvement carried out to existing gas recovery system for oil for the problems referred to above.
The content of the invention
In order to overcome deficiency of the prior art, the present invention to provide a kind of two-stage phase-changing energy-storing gas recovery system for oil and side
Method, because employing two-stage accumulation of energy, that is, increased the cold accumulation system of two grades of oil-gas condensers, condense oil-gas formation staged,
The load of three-level oil-gas condenser is reduced, equipment overall power is less, more saves than the scheme energy of single-stage cold-storage, and refrigeration system is more
It is little.
In order to reach foregoing invention purpose, the technical scheme that its technical problem adopted is solved as follows：
The invention discloses a kind of two-stage phase-changing energy-storing gas recovery system for oil, including device for recovering oil and gas and refrigeration and cold accumulation dress
Put, wherein：
The device for recovering oil and gas includes one-level oil-gas condenser, two grades of oil-gas condensers and the three-level oil gas being sequentially connected
Condenser, for causing oil gas to be input into from the import of the one-level oil-gas condenser side, and then passes sequentially through the primary oil
After gas condenser, two grades of oil-gas condensers and three-level oil-gas condenser precooling, return in the one-level oil-gas condenser and pass through
The outlet output of the one-level oil-gas condenser side；
The cooling ＆ cool-storing apparatus include high-temperature level compressor, air-cooled condenser and high temperature nuclear one-stage throttling device, the high-temperature level
Compressor, air-cooled condenser, high temperature nuclear one-stage throttling device and two grades of oil-gas condensers are sequentially connected and are formed first circulation loop.
Further, the cooling ＆ cool-storing apparatus also include agent for storage of coldness, and the agent for storage of coldness is divided into two grades of agent for storage of coldness and three-level
Agent for storage of coldness, two grades of agent for storage of coldness are positioned in two grades of oil-gas condensers, and the three-level agent for storage of coldness is positioned over the three-level
In oil-gas condenser.
Further, it is separate from inside to outside inside two grades of oil-gas condensers to be provided with for the high-temperature level system that circulates
First high-temperature level tube side of cryogen, the first low-temperature level tube side for the low-temperature level cold-producing medium that circulates, for coat it is described two grades storage
First shell side of cryogen and the first outer shell side for the oil gas that circulates, the first high-temperature level tube side and the first low-temperature level tube side quilt
First shell side is coated, and first shell side is coated by the described first outer shell side；
It is separate from inside to outside inside the three-level oil-gas condenser to be provided with for the of the low-temperature level cold-producing medium that circulates
Two low-temperature level tube sides, the second shell side for coating the three-level agent for storage of coldness and the second housing journey for the oil gas that circulates, it is described
Second low-temperature level tube side is coated by second shell side, and second shell side is coated by the second housing journey.
Further, also including low-temperature level compressor, expansion vessel, expansion vessel throttling arrangement and one-way load releasing valve,
Wherein：
Described low-temperature level compressor one end simultaneously with the one-way load releasing valve and two grades of oil-gas condensers in the first low temperature
Level tube side is connected, the other end simultaneously with the expansion vessel throttling arrangement and three-level oil-gas condenser in the second low-temperature level pipe
Cheng Xianglian；
The low-temperature level compressor, expansion vessel, expansion vessel throttling arrangement and one-way load releasing valve are sequentially connected and shape
Into second circulation loop.
Further, also including a low temperature nuclear one-stage throttling device, described low temperature nuclear one-stage throttling device one end connects two grades of oil
The first low-temperature level tube side in gas condenser, the other end connects the second low-temperature level tube side in the three-level oil-gas condenser, institute
State the second low-temperature level tube side in low temperature nuclear one-stage throttling device and the three-level oil-gas condenser, low-temperature level compressor and two grades of oil gas
The first low-temperature level tube side in condenser is sequentially connected and is formed the 3rd closed circuit.
Further, also including two grades of defrosters and three-level defroster, two grades of defrosters are laid in described
On first outer shell side of two grades of oil-gas condensers, the three-level defroster is laid in outside the second of the three-level oil-gas condenser
On shell side.
Preferably, two grades of defrosters and/or three-level defroster are anti-explosion electric heater.
Preferably, two grades of agent for storage of coldness be the ammoniacal liquor of mass percent concentration 12%～19.5%, mass percent it is dense
The calcium chloride water of degree 21%～27% or the glycol water of mass percent concentration 38%～50%, use so that institute
The liquid-solid two-phase conversion temperature of two grades of agent for storage of coldness is stated between -20～-35 DEG C.
Preferably, the three-level agent for storage of coldness is carbon dioxide, ammonia, the ammoniacal liquor of mass percent concentration 25%～35%, matter
The calcium chloride water of amount percent concentration 29%～30% or the glycol water of mass percent concentration 57%～68%,
With so that the liquid-solid two-phase conversion temperature of the three-level agent for storage of coldness is between -45～-85 DEG C.
The present invention discloses in addition a kind of two-stage phase-changing energy-storing oil-gas recovery method, comprises the following steps：
Step 1：The oil gas produced when oil truck is unloaded carries out precooling by one-level oil-gas condenser so that temperature is reduced
To between -10～+10 °, and while remove the most of moisture in oil gas；
Step 2：The two grades of oil gas entered with two grades of agent for storage of coldness through the oil gas of the preliminary precooling of one-level oil-gas condenser are cold
In condenser, further such that temperature is reduced between -15～-30 °, some hydrocarbon material in oil gas is condensed recovery, remaining
Oil gas containing some hydrocarbon to travel further into continue in the three-level oil-gas condenser with three-level agent for storage of coldness lowers the temperature so that oil gas
Temperature is reduced between -40～-80 °, and the most hydrocarbons in oil gas are condensed recovery, and remaining cryogenic gas is returned again
One-level oil-gas condenser is returned, and heat exchange is carried out with into the high-temperature oil gas in one-level oil-gas condenser, return again to oil truck；
Step 3：The high-temperature high-pressure refrigerant that high-temperature level compressor is discharged phase transformation condensation in air-cooled condenser, and by high temperature
Nuclear one-stage throttling device makes high-temperature high-pressure refrigerant become Low temperature low pressure liquid, and low-temperature level refrigeration is absorbed in two grades of oil-gas condensers
The heat of transformation of the condensation heat of system and two grades of agent for storage of coldness, makes two grades of agent for storage of coldness become solid-state from liquid, while as low-temperature level
The condenser of the condenser of refrigeration system and two grades of oil gas, reduces the thermic load of three-level oil-gas condenser；
Step 4：The high temperature and high pressure gas that low-temperature level compressor is discharged, condense, cryogenic refrigeration in two grades of oil-gas condensers
Agent becomes the subcooled liquid of high pressure low temperature, and it is low that the low-temperature level cold-producing medium of high pressure low temperature becomes low temperature through low temperature nuclear one-stage throttling device again
The liquid of pressure, and the heat of three-level agent for storage of coldness is absorbed in three-level oil-gas condenser, make three-level agent for storage of coldness be kept for -45～-85 DEG C
Ultralow temperature.
Preferably, the ammoniacal liquor of two grades of agent for storage of coldness mass percent concentrations 12%～19.5% described in step 2, quality hundred
Divide the calcium chloride water of specific concentration 21%～27% or the glycol water of mass percent concentration 38%～50% so that
The liquid-solid two-phase conversion temperature of two grades of agent for storage of coldness is between -20～-35 DEG C；Described three-level agent for storage of coldness be carbon dioxide,
Ammonia, the ammoniacal liquor of mass percent concentration 25%～35%, the calcium chloride water of mass percent concentration 29%～30% or matter
Amount percent concentration 57%～68% glycol water so that the liquid-solid two-phase conversion temperature of the three-level agent for storage of coldness-
Between 45～-85 DEG C.
Further, it is further comprising the steps of：
Step 5：When two grades of oil-gas condensers and/or three-level oil-gas condenser need defrosting, high/low temperature level refrigeration system
Shut down, two grades of defrosters and/or three-level defroster start, respectively to two grades of oil-gas condensers and/or three-level oil gas
Condenser carries out overall defrosting.
The present invention compared with prior art, has the following advantages that and actively imitates due to using above technical scheme, being allowed to
Really：
1st, when traditional condensing of the prior art adopts binary folding type cooling system, the instantaneous maximum unloaded need to be met
Value, its occupation area of equipment is big, generally 2～8 square metres；Can according to the system footprint area after this process flow scheme design
Control saves originally compact gas station's land used within 1.5 square metres；As a result of this accumulation of energy technique, refrigeration system
Can be designed to fairly small, so dramatically saves on manufacturing cost, be that gas station's popularization and application this energy-saving environmental protection devices is created
Advantage；
2nd, legacy equipment of the prior art due to power it is big, be required for using the high voltage of 380V, according to 220V's
Mains voltage, electric current can be very big, but according to the system of this process flow scheme design, due to total power consumption typically 1～3KW with
It is interior, equivalent to the power of domestic air conditioning, therefore the civilian power supply of 220V can be adopted completely, simplify mounting condition；
3rd, a kind of two-stage phase-changing energy-storing gas recovery system for oil of the invention increased two grades of oil because employing two-stage accumulation of energy
The cold accumulation system of gas condenser, condenses oil-gas formation staged, reduces the load of three-level oil-gas condenser, equipment overall power
It is less, more save than the scheme energy of single-stage cold-storage, refrigeration system is less.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to use needed for embodiment description
Accompanying drawing be briefly described.It is clear that drawings in the following description are only some embodiments of the present invention, for ability
For field technique personnel, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.It is attached
In figure：
Fig. 1 is the oil-gas recovery device connection diagram of gas station of the prior art a time；
Fig. 2 is that the emptying connection diagram after energy-storage type oil-gas recovery device is loaded onto in the present invention；
Fig. 3 is a kind of structural representation of two-stage phase-changing energy-storing gas recovery system for oil in the present invention；
Fig. 4 is a kind of schematic flow sheet of two-stage phase-changing energy-storing oil-gas recovery method in the present invention.
【Primary symbols explanation】
1- one-level oil-gas condensers；
Bis- grades of oil-gas condensers of 2-；
3- three-level oil-gas condensers；
4- high-temperature level compressors；
The air-cooled condensers of 5-；
6- high temperature nuclear one-stage throttling devices；
7- low-temperature level compressors；
8- expansion vessels；
9- expansion vessel throttling arrangements；
10- one-way load releasing valves；
11- low temperature nuclear one-stage throttling devices；
Bis- grades of defrosters of 12-；
13- three-level defrosters；
Bis- grades of agent for storage of coldness of 14-；
15- three-level agent for storage of coldness.
Specific embodiment
Below with reference to the accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention
And discussion, it is clear that as described herein is only a part of example of the present invention, is not whole examples, based on the present invention
In embodiment, the every other enforcement that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example, belongs to protection scope of the present invention.
As shown in Fig. 2 loading onto the main emptying process after energy-storage type gas recovery system for oil：During RTC unloading, closing is cut
Disconnected valve V1, opens stop valve V3 and stop valve V5, and liquid oil flows into buried oil storage tank, buried oil storage through stop valve V5
Oil gas in tank first passes through stop valve V2 into after energy-storage type device for recovering oil and gas, and the tail gas after process is returned by stop valve V3
Oil truck.The liquid of recovery is periodically put into buried oil storage tank by stop valve V4.
Embodiment one
As shown in figure 3, the invention discloses a kind of two-stage phase-changing energy-storing gas recovery system for oil, including device for recovering oil and gas and
Cooling ＆ cool-storing apparatus, wherein：
The device for recovering oil and gas includes 1, the two grades of oil-gas condensers 2 of one-level oil-gas condenser being sequentially connected and three-level oil
Gas condenser 3, for causing oil gas to be input into from the import of the side of one-level oil-gas condenser 1, and then passes sequentially through described one
After level 1, two grades of oil-gas condensers 2 of oil-gas condenser and the precooling of three-level oil-gas condenser 3, the one-level oil-gas condenser 1 is returned
In and by the outlet of the side of one-level oil-gas condenser 1 output；
The cooling ＆ cool-storing apparatus include high-temperature level compressor 4, air-cooled condenser 5 and high temperature nuclear one-stage throttling device 6, the high temperature
Level compressor 4, air-cooled condenser 5, high temperature nuclear one-stage throttling device 6 and two grades of oil-gas condensers 2 are sequentially connected and form first circulation and return
Road.
In the present embodiment, the cooling ＆ cool-storing apparatus are also including the agent for storage of coldness of liquid-solid two-phase transformant, the agent for storage of coldness point
For two grades of agent for storage of coldness 14 and three-level agent for storage of coldness 15, two grades of agent for storage of coldness 14 are positioned in two grades of oil-gas condensers 2, preferably
, two grades of agent for storage of coldness 14 are the ammoniacal liquor of mass percent concentration 12%～19.5%, mass percent concentration 21%～
27% calcium chloride water or the glycol water of mass percent concentration 38%～50%.The three-level agent for storage of coldness 15 is put
In being placed in the three-level oil-gas condenser 3, it is preferred that the three-level agent for storage of coldness 15 is carbon dioxide, ammonia, mass percent concentration
25%～35% ammoniacal liquor, the calcium chloride water of mass percent concentration 29%～30% or mass percent concentration 57%～
68% glycol water.
In the present embodiment, when liquid-solid two-phase conversion temperature is more than -55 DEG C, with above-mentioned several solns can, when liquid it is solid
When two phase transition temperatures are less than -70 DEG C, because calcium chloride water and glycol water are to not -85 DEG C of so low temperature
Degree, as ammoniacal liquor can only be used if solution.Specifically, when liquid-solid two-phase conversion temperature is less than -55 DEG C it is not recommended that using
Calcium chloride water, when liquid-solid two-phase conversion temperature is less than -70 DEG C it is not recommended that using glycol water.
Generally two grades of agent for storage of coldness 14 and three-level agent for storage of coldness 15 select be under normal temperature liquid material it is even more ideal, such as
Ammoniacal liquor, calcium chloride water and glycol water etc..Wherein, the liquid-solid two-phase conversion temperature point of two grades of agent for storage of coldness 14 is -20
Between～-35 DEG C, the liquid-solid two-phase conversion temperature point of three-level agent for storage of coldness 15 is between -45～-85 DEG C.
Further, it is separate from inside to outside inside two grades of oil-gas condensers 2 to be provided with for the high-temperature level that circulates
First high-temperature level tube side (not shown) of cold-producing medium, the first low-temperature level tube side (not shown) for the low-temperature level cold-producing medium that circulates,
For coating first shell side (not shown) of two grades of agent for storage of coldness 14 and the first outer shell side (not shown) for the oil gas that circulates,
The first high-temperature level tube side and the first low-temperature level tube side are coated by first shell side, and first shell side is by described first
Outer shell side is coated；
It is separate from inside to outside inside the three-level oil-gas condenser 3 to be provided with for the of the low-temperature level cold-producing medium that circulates
Two low-temperature level tube sides (not shown), the second shell side (not shown) for coating the three-level agent for storage of coldness 15 and for the oil gas that circulates
Second housing journey (not shown), the second low-temperature level tube side coated by second shell side, and second shell side is by institute
State second housing journey to be coated.
With further reference to Fig. 3, the two-stage phase-changing energy-storing gas recovery system for oil also includes low-temperature level compressor 7, expansion capacity
Device 8, expansion vessel throttling arrangement 9 and one-way load releasing valve 10, wherein：
Described one end of low-temperature level compressor 7 simultaneously with the one-way load releasing valve 10 and two grades of oil-gas condensers 2 in first
Low-temperature level tube side is connected, and the other end is simultaneously low with second in throttling arrangement 9 and three-level oil-gas condenser 3 with the expansion vessel
Warm level tube side is connected；
The low-temperature level compressor 7, expansion vessel 8, expansion vessel throttling arrangement 9 and one-way load releasing valve 10 are sequentially connected
And form second circulation loop.
With continued reference to Fig. 3, the two-stage phase-changing energy-storing gas recovery system for oil also includes a low temperature nuclear one-stage throttling device 11, described
The one end of low temperature nuclear one-stage throttling device 11 connects the first low-temperature level tube side in two grades of oil-gas condensers 2, and other end connection is described
In the second low-temperature level tube side in three-level oil-gas condenser 3, the low temperature nuclear one-stage throttling device 11 and the three-level oil-gas condenser 3
The second low-temperature level tube side, low-temperature level compressor 7 and two grades of oil-gas condensers 2 in the first low-temperature level tube side be sequentially connected and shape
Into the 3rd closed circuit.
The two-stage phase-changing energy-storing gas recovery system for oil further includes two grades of defrosters 12 and three-level defroster 13,
Two grades of defrosters 12 are laid on the first outer shell side of two grades of oil-gas condensers 2, the three-level defroster 13
It is laid in the second housing journey of the three-level oil-gas condenser 3.In the present embodiment, two grades of defrosters 12 and/or three
Level defroster 13 is preferably anti-explosion electric heater.
Embodiment two
As shown in figure 4, the present invention discloses in addition a kind of two-stage phase-changing energy-storing oil-gas recovery method, including petroleum vapor recovery stream
Journey and refrigeration and cold accumulation flow process, wherein：
Petroleum vapor recovery flow process specifically includes following steps：
Step 1：The oil gas produced when oil truck is unloaded carries out precooling by one-level oil-gas condenser 1 so that temperature is reduced
To between -10～+10 °, and while remove the most of moisture in oil gas；
Step 2：Two grades of oil gas with two grades of agent for storage of coldness 14 are entered through the oil gas of the preliminary precooling of one-level oil-gas condenser 1
In condenser 2, the heat of two grades of agent for storage of coldness of oil gas absorbing so that temperature is reduced between -15～-30 °, the part hydrocarbon in oil gas
Class material is condensed recovery, and the three-level oil gas that the remaining oil gas containing some hydrocarbon is traveled further into three-level agent for storage of coldness 15 is cold
Continue to lower the temperature in condenser 3 so that oil gas temperature is further reduced between -40～-80 °, the most hydrocarbons in oil gas
Matter is condensed recovery, and remaining cryogenic gas returns again to one-level oil-gas condenser 1, and with one-level oil-gas condenser 1
High-temperature oil gas carry out heat exchange, return again to oil truck；Wherein, two grades of agent for storage of coldness 14 can for mass percent concentration 12%～
19.5% ammoniacal liquor, the calcium chloride water of mass percent concentration 21%～27% or mass percent concentration 38%～50%
Glycol water, its selection principle be ensure its liquid-solid two-phase conversion temperature between -20～-35 DEG C.Three-level agent for storage of coldness
15 can be carbon dioxide, ammonia, the ammoniacal liquor of mass percent concentration 25%～35%, the chlorine of mass percent concentration 29%～30%
Change the glycol water of the calcium aqueous solution or mass percent concentration 57%～68%, its selection principle is to ensure its liquid-solid two-phase
Conversion temperature is between -45～-85 DEG C.
Refrigeration and cold accumulation flow process specifically includes following steps：
Step 3：The high-temperature high-pressure refrigerant that high-temperature level compressor 4 is discharged phase transformation condensation in air-cooled condenser 5, and by height
Warm nuclear one-stage throttling device 6 makes high-temperature high-pressure refrigerant become Low temperature low pressure liquid, and absorbs low-temperature level in two grades of oil-gas condensers 2
The heat of transformation of the condensation heat of refrigeration system and two grades of agent for storage of coldness 14, makes two grades of agent for storage of coldness 14 become solid-state from liquid, while making
The condenser of condenser and two grades of oil gas for low-temperature level refrigeration system, reduces the thermic load of three-level oil-gas condenser 3；
Step 4：The high temperature and high pressure gas that low-temperature level compressor 7 is discharged, condense, low temperature system in two grades of oil-gas condensers 2
Cryogen becomes the subcooled liquid of high pressure low temperature, and the low-temperature level cold-producing medium of high pressure low temperature becomes low through low temperature nuclear one-stage throttling device 11 again
The liquid of warm low pressure, and the heat of three-level agent for storage of coldness 15 is absorbed in three-level oil-gas condenser 3, make three-level agent for storage of coldness 15 keep-
45～-85 DEG C of ultralow temperature.
In the present embodiment, when liquid-solid two-phase conversion temperature is more than -55 DEG C, with above-mentioned several solns can, when liquid it is solid
When two phase transition temperatures are less than -70 DEG C, because calcium chloride water and glycol water are to not -85 DEG C of so low temperature
Degree, as ammoniacal liquor can only be used if solution.Specifically, when liquid-solid two-phase conversion temperature is less than -55 DEG C it is not recommended that using
Calcium chloride water, when liquid-solid two-phase conversion temperature is less than -70 DEG C it is not recommended that using glycol water.
Additionally, cool-storage time can according to gas station unload situation determine, it is necessary to control in the time interval unloaded twice,
And certain surplus is left, typically can select between 6～30 hours.During cold-storage, high-temperature level elder generation cold-storage, cold-storage temperature to be basically reached
Start high/low temperature level cold-storage simultaneously after degree simultaneously again.
It is laid with corresponding two grades of defrosters 12 and three on two grades of oil-gas condensers 2 and three-level oil-gas condenser 3 respectively
Level defroster 13, after gas recovery system for oil runs 1～6 month, needs to two grades of oil-gas condensers 2 and/or three-level oil
The operation that gas condenser 3 is defrosted, it is comprised the following steps that：
Step 5：When two grades of oil-gas condensers 2 and/or three-level oil-gas condenser 3 need defrosting, high/low temperature level refrigeration system
System shuts down, and two grades of defrosters 12 and/or three-level defroster 13 start, respectively to two grades of oil-gas condensers 2 and/or three
Level oil-gas condenser 3 carries out overall defrosting.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
All should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (12)
1. a kind of two-stage phase-changing energy-storing gas recovery system for oil, it is characterised in that including device for recovering oil and gas and cooling ＆ cool-storing apparatus,
Wherein：
The device for recovering oil and gas includes one-level oil-gas condenser, two grades of oil-gas condensers and the three-level oil gas condensation being sequentially connected
Device, for causing oil gas to be input into from the import of the one-level oil-gas condenser side, and then passes sequentially through the primary oil air cooling
After condenser, two grades of oil-gas condensers and three-level oil-gas condenser precooling, return in the one-level oil-gas condenser and by described
The outlet output of one-level oil-gas condenser side；
The cooling ＆ cool-storing apparatus include high-temperature level compressor, air-cooled condenser and high temperature nuclear one-stage throttling device, the high-temperature level compression
Machine, air-cooled condenser, high temperature nuclear one-stage throttling device and two grades of oil-gas condensers are sequentially connected and are formed first circulation loop.
2. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 1, it is characterised in that the refrigeration and cold accumulation
Device also includes agent for storage of coldness, and the agent for storage of coldness is divided into two grades of agent for storage of coldness and three-level agent for storage of coldness, and two grades of agent for storage of coldness are positioned over institute
In stating two grades of oil-gas condensers, the three-level agent for storage of coldness is positioned in the three-level oil-gas condenser.
3. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 2, it is characterised in that
It is separate from inside to outside inside two grades of oil-gas condensers to be provided with for the first high of high-temperature level refrigeration agent of circulating
Warm level tube side, the first low-temperature level tube side for the low-temperature level cold-producing medium that circulates, the first shell for coating two grades of agent for storage of coldness
Journey and the first outer shell side for the oil gas that circulates, the first high-temperature level tube side and the first low-temperature level tube side are by first shell side
Coated, first shell side is coated by the described first outer shell side；
It is separate from inside to outside inside the three-level oil-gas condenser to be provided with for the second low of the low-temperature level cold-producing medium that circulates
Warm level tube side, the second shell side for coating the three-level agent for storage of coldness and the second housing journey for the oil gas that circulates, described second
Low-temperature level tube side is coated by second shell side, and second shell side is coated by the second housing journey.
4. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 3, it is characterised in that also including low-temperature level
Compressor, expansion vessel, expansion vessel throttling arrangement and one-way load releasing valve, wherein：
Described low-temperature level compressor one end simultaneously with the one-way load releasing valve and two grades of oil-gas condensers in the first low-temperature level pipe
Cheng Xianglian, the other end simultaneously with the expansion vessel throttling arrangement and three-level oil-gas condenser in the second low-temperature level tube side phase
Even；
The low-temperature level compressor, expansion vessel, expansion vessel throttling arrangement and one-way load releasing valve are sequentially connected and form
Two closed circuits.
5. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 3, it is characterised in that also including a low temperature
Nuclear one-stage throttling device, described low temperature nuclear one-stage throttling device one end connects the first low-temperature level tube side in two grades of oil-gas condensers, separately
One end connects the second low-temperature level tube side in the three-level oil-gas condenser, the low temperature nuclear one-stage throttling device and the three-level oil gas
The first low-temperature level tube side in the second low-temperature level tube side, low-temperature level compressor and two grades of oil-gas condensers in condenser phase successively
Connect and formed the 3rd closed circuit.
6. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 3, it is characterised in that also remove including two grades
White device and three-level defroster, two grades of defrosters are laid on the first outer shell side of two grades of oil-gas condensers,
The three-level defroster is laid in the second housing journey of the three-level oil-gas condenser.
7. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 6, it is characterised in that two grades of defrostings
Device and/or three-level defroster are anti-explosion electric heater.
8. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to claim 2, it is characterised in that two grades of cold-storages
Agent is the ammoniacal liquor of mass percent concentration 12%～19.5%, the calcium chloride water of mass percent concentration 21%～27% or
The glycol water of mass percent concentration 38%～50%, uses the liquid-solid two-phase conversion temperature so that two grades of agent for storage of coldness
Degree is between -20～-35 DEG C.
9. a kind of two-stage phase-changing energy-storing gas recovery system for oil according to right wants 2, it is characterised in that the three-level agent for storage of coldness
For carbon dioxide, ammonia, the ammoniacal liquor of mass percent concentration 25%～35%, mass percent concentration 29%～30% calcium chloride
The glycol water of the aqueous solution or mass percent concentration 57%～68%, uses the liquid solid two so that the three-level agent for storage of coldness
Phase transition temperature is between -45～-85 DEG C.
10. a kind of two-stage phase-changing energy-storing oil-gas recovery method, it is characterised in that comprise the following steps：
Step 1：The oil gas produced when oil truck is unloaded carries out precooling by one-level oil-gas condenser so that temperature is reduced to -10
Between～+10 °, and while remove the most of moisture in oil gas；
Step 2：Two grades of oil-gas condensers with two grades of agent for storage of coldness are entered through the oil gas of the preliminary precooling of one-level oil-gas condenser
In, further such that temperature is reduced between -15～-30 °, some hydrocarbon material in oil gas is condensed recovery, and residue contains
The oil gas of some hydrocarbon to travel further into continue in the three-level oil-gas condenser with three-level agent for storage of coldness lowers the temperature so that oil gas temperature
It is reduced between -40～-80 °, the most hydrocarbons in oil gas are condensed recovery, remaining cryogenic gas returns again to one
Level oil-gas condenser, and heat exchange is carried out with into the high-temperature oil gas in one-level oil-gas condenser, return again to oil truck；
Step 3：The high-temperature high-pressure refrigerant that high-temperature level compressor is discharged phase transformation condensation in air-cooled condenser, and by high-temperature level section
Stream device makes high-temperature high-pressure refrigerant become Low temperature low pressure liquid, and low-temperature level refrigeration system is absorbed in two grades of oil-gas condensers
Condensation heat and two grades of agent for storage of coldness the heat of transformation, make two grades of agent for storage of coldness become solid-state from liquid, at the same as low-temperature level refrigeration
The condenser of the condenser of system and two grades of oil gas, reduces the thermic load of three-level oil-gas condenser；
Step 4：The high temperature and high pressure gas that low-temperature level compressor is discharged, condense in two grades of oil-gas condensers, and low-temperature refrigerant becomes
Into the subcooled liquid of high pressure low temperature, the low-temperature level cold-producing medium of high pressure low temperature becomes low-temp low-pressure through low temperature nuclear one-stage throttling device again
Liquid, and the heat of three-level agent for storage of coldness is absorbed in three-level oil-gas condenser, make the super of -45～-85 DEG C of three-level agent for storage of coldness holding
Low temperature.
A kind of 11. two-stage phase-changing energy-storing oil-gas recovery methods according to claim 10, it is characterised in that institute in step 2
The ammoniacal liquor of the two grades of agent for storage of coldness mass percent concentrations 12%～19.5% stated, the chlorination of mass percent concentration 21%～27%
The glycol water of the calcium aqueous solution or mass percent concentration 38%～50% so that the liquid-solid two-phase of two grades of agent for storage of coldness
Conversion temperature is between -20～-35 DEG C；Described three-level agent for storage of coldness be carbon dioxide, ammonia, mass percent concentration 25%～
35% ammoniacal liquor, the calcium chloride water of mass percent concentration 29%～30% or mass percent concentration 57%～68%
Glycol water so that the liquid-solid two-phase conversion temperature of the three-level agent for storage of coldness is between -45～-85 DEG C.
12. a kind of two-stage phase-changing energy-storing oil-gas recovery methods according to claim 10, it is characterised in that also including following
Step：
Step 5：When two grades of oil-gas condensers and/or three-level oil-gas condenser need defrosting, high/low temperature level refrigeration system stops
Operating, two grades of defrosters and/or three-level defroster start, respectively to two grades of oil-gas condensers and/or three-level oil gas condensation
Device carries out overall defrosting.
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