CN111234859A - Fixed aviation kerosene oil gas recovery system - Google Patents
Fixed aviation kerosene oil gas recovery system Download PDFInfo
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- CN111234859A CN111234859A CN202010260552.1A CN202010260552A CN111234859A CN 111234859 A CN111234859 A CN 111234859A CN 202010260552 A CN202010260552 A CN 202010260552A CN 111234859 A CN111234859 A CN 111234859A
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- 238000011084 recovery Methods 0.000 title claims abstract description 60
- 239000003350 kerosene Substances 0.000 title claims abstract description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 166
- 238000005057 refrigeration Methods 0.000 claims abstract description 129
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000003795 desorption Methods 0.000 claims abstract description 45
- 238000009833 condensation Methods 0.000 claims abstract description 20
- 230000005494 condensation Effects 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 18
- 238000001816 cooling Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 265
- 239000003507 refrigerant Substances 0.000 description 24
- 239000003463 adsorbent Substances 0.000 description 17
- 239000004215 Carbon black (E152) Substances 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
- C10G5/06—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas by cooling or compressing
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
- C10G5/02—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas with solid adsorbents
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a fixed aviation kerosene oil gas recovery system, which comprises three modules, namely a conveying system, a condensing system and an adsorption system, wherein the conveying system comprises an oil gas collecting system, a gas-liquid separation system and a conveying power system; the adsorption system comprises an adsorption tank, a vacuum pump, an adsorption electric valve and a desorption electric valve. The oil gas recovery system integrates all modules of the oil gas recovery system on an integral base in a skid-mounted structure by combining a condensation method and an adsorption method, the condensation system adopts a three-stage independent refrigeration system to carry out fractional cooling and condensation on oil gas, and condensed oil is collected in the same oil storage tank through three different pipelines; meanwhile, the adsorption system continuously adsorbs the oil gas by adopting a mode that two adsorption tanks run alternately, so that the efficiency of the oil gas recovery system is improved, and the cost of oil gas recovery is reduced.
Description
Technical Field
The invention belongs to the technical field of oil gas recovery, and particularly relates to a fixed type aviation kerosene oil gas recovery system.
Background
In the process of loading oil in an oil depot, a large amount of oil gas can be volatilized by an aircraft refueling truck. In order to avoid the environmental pollution caused by the direct emission of the oil gas into the atmosphere, an oil gas recovery system is needed to collect the volatilized oil gas. The currently available oil gas recovery processes include a condensation method, an adsorption method, an absorption method and a membrane separation method, but the problems of high cost, low efficiency and the like exist when one method is independently used for oil gas recovery.
The existing condensation method needs to carry out high deep cooling in order to meet increasingly strict international and local discharge standards, adopts a three-level refrigeration system to gradually cool oil gas, liquefies most light hydrocarbon components, and realizes recovery, but the mode needs to pay higher power consumption cost.
The existing activated carbon adsorption method mainly comprises two modes of pressure swing adsorption and temperature swing adsorption, and the two modes have advantages and disadvantages; the pressure swing adsorption is to finish desorption in a vacuum mode, the service life of the activated carbon is long, but the adsorption efficiency and the desorption efficiency are greatly influenced by temperature, and the best performance is difficult to play in practical application; the temperature swing adsorption finishes desorption in a high temperature mode, the desorption is cleaner, but the service life of the active carbon is shorter, and the operation cost is higher.
Disclosure of Invention
The invention aims to design a fixed aviation kerosene oil gas recovery system, which combines a condensation method and an adsorption method, integrates all modules of the oil gas recovery system on an integral base in a skid-mounted structure, adopts a three-stage independent refrigeration circulation system to carry out fractional condensation on oil gas, and collects the condensed oil of the three-stage independent refrigeration system in the same oil storage tank through three different pipelines; the adsorption system continuously adsorbs oil gas by adopting a mode of alternately operating two adsorption tanks, so that the efficiency of the oil gas recovery system is improved, and the cost of oil gas recovery is reduced.
The purpose of the invention can be realized by adopting the following technical scheme: a fixed aviation kerosene oil gas recovery system comprises three modules, namely a conveying system, a condensing system and an adsorption system, wherein the conveying system comprises an oil gas collecting system, a gas-liquid separation system and a conveying power system; the condensing system comprises a three-stage independent refrigerating system consisting of a first-stage refrigerating system, a second-stage refrigerating system and a third-stage refrigerating system, an oil storage tank and an oil discharge system; the adsorption system comprises an adsorption tank, a vacuum pump, a chimney, an adsorption electric valve and a desorption electric valve;
the first-stage refrigeration system and the second-stage refrigeration system of the condensation system are a single-stage refrigeration circulation system formed by sequentially connecting an evaporator, a compressor, a condenser and an expansion valve, the second-stage refrigeration system also comprises a gas-liquid separator, a liquid storage tank, a heat exchanger, an oil-gas heater and a filter, the gas-liquid separator is connected between the evaporator and the compressor, the liquid storage tank is connected between the condenser and the expansion valve, the heat exchanger is connected between the compressor and the expansion valve, the oil-gas heater is connected between the heat exchanger and the expansion valve, and the filter is connected between the; the third-stage refrigeration system is a cascade refrigeration system and comprises a high-temperature-stage refrigeration system and a low-temperature-stage refrigeration system; the evaporator of the first-stage refrigeration system, the evaporator of the second-stage refrigeration system and the evaporator of the third-stage refrigeration system are sequentially connected, and the evaporators are respectively provided with a condensed oil outlet; the oil storage tank is provided with a collection inlet and a discharge outlet, the collection inlet is respectively connected with the condensed oil outlets of the three evaporators, and the discharge outlet is connected with an oil discharge system; the oil discharge system is provided with an oil pump and a discharge filter;
the adsorption system is provided with two adsorption tanks, each adsorption tank is provided with an adsorption inlet, an adsorption outlet and a desorption outlet, the adsorption inlet is connected with the cold side of the evaporator of the third-stage refrigeration system, the adsorption outlet is connected with a chimney, the desorption outlet is connected with the inlet of a vacuum pump, the outlet of the vacuum pump is connected with an oil gas conveying pipeline, the adsorption inlet and the adsorption outlet are provided with adsorption electric valves, and the desorption outlet is provided with a desorption electric valve.
The inlet of the oil-gas collecting system of the conveying system is connected with the outlet of the oil-gas conveying pipeline, and the outlet of the oil-gas collecting system is connected with the gas-liquid separating system through a pipeline; one end of the conveying power system is connected with the gas-liquid separation system, and the other end of the conveying power system is connected with the condensation system.
The cold side of the oil gas heater is connected with the cold side of the evaporator of the third-stage refrigeration system, and the hot side of the oil gas heater is connected with the inlet of the adsorption system.
And the cold side of the heat exchanger is connected with a condensed oil outlet of an evaporator of the second-stage refrigeration system and a condensed oil outlet of an evaporator of the third-stage refrigeration system, and the hot side of the heat exchanger is connected with a collection inlet of the oil storage tank.
The evaporator of the second-stage refrigeration system and the evaporator of the third-stage refrigeration system are provided with heaters for preventing the condition of frost formation or ice blockage caused by over-low temperature in the evaporators or pressure difference sensors which are electrically connected with the heaters and used for controlling the starting and the stopping of the heaters, and the heaters are electric tracing bands.
The oil storage tank is internally provided with a liquid level meter which is electrically connected with an oil pump of an oil discharge system arranged at a discharge outlet of the oil storage tank.
The oil storage tank is provided with a branch condensed oil interface for connecting an evaporator condensed oil outlet of a branch oil gas recovery device or oil storage tanks of other oil gas recovery devices.
And the inlet of the vacuum pump is provided with a branch desorption interface for connecting the desorption outlet of the adsorption tank of the branch oil-gas recovery device to be butted.
The power transmission system comprises a fan and a flame arrester, and the fan is connected with the hot side of the evaporator of the first-stage refrigeration system.
The blower is a roots blower, and the flame arrester is arranged at an oil gas inlet of the blower.
When the oil gas recovery device is implemented, oil gas of an oil gas conveying pipeline passes through a conveying system and then is blown into an evaporator of a first-stage refrigerating system through a fan to exchange heat with a refrigerant in an evaporator pipe, the temperature of the oil gas is treated to 3-7 ℃, and condensed oil (mainly water and heavy components) flows out of a condensed oil outlet arranged on the evaporator of the first-stage refrigerating system and enters an oil storage tank through a collecting inlet arranged on the oil storage tank to be stored; the oil gas treated by the evaporator of the first stage refrigeration system enters the evaporator of the second stage refrigeration system again to exchange heat with the refrigerant in the evaporator pipe, the temperature of the oil gas is treated to-20 ℃ to-30 ℃, wherein the condensed oil (most of C5-C7 oil gas) flows out from the condensed oil outlet arranged on the evaporator of the second stage refrigeration system, meanwhile, the oil gas treated by the evaporator of the second stage refrigeration system enters the evaporator of the third stage refrigeration system again to exchange heat with the refrigerant in the evaporator pipe, the temperature of the oil gas is treated to-55 ℃ to-65 ℃, wherein the condensed oil (mainly light hydrocarbon components) flows out from the condensed oil outlet arranged on the evaporator of the third stage refrigeration system, because the temperature of the condensed oil from the evaporators of the first stage refrigeration system, the second stage refrigeration system and the third stage refrigeration system is different, when the condensed oil with different temperatures is mixed in the oil storage tank, the high-melting-point oil component is solidified to block a connecting pipeline of the oil storage tank, the temperature of the condensed oil condensed in an evaporator of the second-stage refrigeration system and an evaporator of the third-stage refrigeration system needs to be raised, namely, the condensed oil enters a heat exchanger of the second-stage refrigeration system and exchanges heat with a refrigerant in a liquid pipe of the second-stage refrigeration system, the heat released by the condensation of the refrigerant is recovered by the condensed oil to be raised, the heat enters the temporary oil storage tank after being raised, meanwhile, the refrigerant is further cooled after the condensed oil is exchanged with the refrigerant, the supercooling degree of the refrigerant of the second-stage refrigeration system is increased, and the refrigeration performance of the second-stage refrigeration system is improved.
When the liquid level meter of the oil storage tank detects that the liquid level in the tank reaches the set maximum height, the oil pump of the oil discharge system is automatically started, and condensed oil in the oil storage tank is discharged into a user-specified oil tank through a discharge outlet until the liquid level in the oil storage tank is lower than the set minimum height.
Oil gas after the evaporator of tertiary refrigerating system handles enters into oil gas heater and heaies up, then enters into adsorption system and adsorbs, and the process that oil gas heater heaied up is: the refrigerant enters the oil gas heater in the liquid pipe of the second-stage refrigeration system and then is further condensed to release heat, the oil gas treated by the evaporator of the third-stage refrigeration system enters the oil gas heater, the temperature rise is realized after the heat released by the further condensation of the refrigerant is recovered, the adsorption efficiency is prevented from being influenced when the oil gas at low temperature directly enters the adsorption tank, the supercooling degree of the refrigerant of the second-stage refrigeration system is further increased, and the refrigeration performance of the second-stage refrigeration system is further improved.
The oil gas adsorption process is as follows: the adsorption electric valves of the adsorption inlet and the adsorption outlet of the adsorption tank A are opened, the other electric valves are closed, the oil gas treated by the evaporator of the second-stage refrigeration system enters the adsorption tank A, light hydrocarbon components in the oil gas are adsorbed by the adsorbent in the adsorption tank A, when the adsorbent in the adsorption tank A is saturated or close to the saturation, the adsorption electric valve of the adsorption inlet and the adsorption outlet of the adsorption tank B is opened, so that the oil gas treated by the evaporator of the second-stage refrigeration system enters the adsorption tank B, light hydrocarbon components in the oil gas are adsorbed by the adsorbent in the adsorption tank B, simultaneously closing the adsorption electric valves at the adsorption inlet and the adsorption outlet of the adsorption tank A, opening the desorption electric valve at the desorption outlet of the adsorption tank A, starting the vacuum pump, desorbing the adsorbent in the adsorption tank A, returning the desorbed oil gas to an oil gas conveying pipeline to be mixed with crude oil gas, and then returning the oil gas to an oil gas recovery system for recovery; when the adsorbent in the adsorption tank B is saturated or close to saturation, the adsorbent in the adsorption tank A is desorbed and is in a standby state, and the adsorption electric valves of the adsorption inlet and the adsorption outlet of the adsorption tank A are opened again at the moment, so that the oil gas enters the adsorption tank A and is continuously adsorbed by the adsorbent; meanwhile, the adsorption electric valve of the adsorption inlet and the adsorption outlet of the adsorption tank B is closed, the desorption electric valve of the adsorption tank B is opened, the vacuum pump is kept started, and the adsorbent in the adsorption tank B is desorbed, so that the adsorption tank A and the adsorption tank B are alternated to continuously adsorb the oil gas treated by the evaporator of the third-stage refrigeration system in turn, and the tail gas obtained after the adsorption of the oil gas by the adsorption tank A and the adsorption tank B is discharged into the atmosphere through a chimney.
The invention has the beneficial effects that:
1) the oil gas recovery system combines a condensation method and an adsorption method, and all modules of the oil gas recovery system are integrated on an integral base in a skid-mounted structure, so that the integral installation and the migration are convenient, and the occupied area is reduced;
the three-stage refrigeration system of the condensation system carries out three-stage cooling condensation on the oil gas, and meanwhile, the adsorption system continuously adsorbs the oil gas in a mode that two adsorption tanks alternately run, so that the efficiency of the oil gas recovery system is improved, and the cost of oil gas recovery is reduced;
2) the refrigerant of the second-stage refrigeration system exchanges heat with the condensed oil condensed by the evaporators of the second-stage refrigeration system and the third-stage refrigeration system in the heat exchanger, so that the temperature of the condensed oil can be raised to be above a freezing point, the connection pipeline in the oil storage tank and the oil storage tank is prevented from being blocked, the load of the condenser of the second-stage refrigeration system can be reduced, the supercooling degree of the refrigerant of the second-stage refrigeration system is increased, and the refrigeration performance of the second-stage refrigeration system is improved;
3) the refrigerant of the second-stage refrigeration system exchanges heat with the oil gas treated by the evaporator of the third-stage refrigeration system in the oil gas heater, so that the temperature of the oil gas can be increased, the phenomenon that the oil gas with too low temperature directly enters the adsorption tank to influence the adsorption efficiency is avoided, the load of a condenser of the second-stage refrigeration system is further reduced, the supercooling degree of the refrigerant of the second-stage refrigeration system is increased, and the refrigeration performance of the second-stage refrigeration system is further improved;
4) the oil gas recovery system is provided with a desorption interface and a condensed oil interface, and can realize the oil discharge and desorption actions of the tank area oil gas recovery device and the movable oil gas recovery device.
Drawings
FIG. 1 is a schematic diagram of the operation of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the second stage refrigeration system of the present invention;
FIG. 3 is a schematic view of the mounting structure of the present invention;
the labels in the figure are: 1. an oil gas collecting system 2, a gas-liquid separating system 3, a flame arrester 4, a fan 5, evaporators I, 6, evaporators II, 7, evaporators III, 8, an oil gas heater 9, an oil storage tank 10, a discharge filter 11, an oil pump 12, a branch condensed oil interface 13, an electric tracing band 14, adsorption tanks A, 15, adsorption tanks B, 16, adsorption electric valves I, 17, adsorption electric valves II, 18, desorption electric valves I, 19, adsorption electric valves III, 20, adsorption electric valves IV, 21, desorption electric valves II, 22, a chimney 23, a vacuum pump 24, a branch desorption interface 25, a vacuum pump desorption electric valve 26, an oil gas conveying pipeline 27, branch condensed oil, 28, branch adsorption tanks desorption oil gas, 29, a user-specified oil tank 30, a gas-liquid separator 31, a compressor 32, a condenser, 33 and a liquid storage tank, 34. the system comprises a heat exchanger, 35, a filter, 36, an expansion valve, 37, oil gas inlets and oil gas outlets of evaporator II, 38, oil gas outlets and oil gas outlets of evaporator II, 39, oil gas inlets and oil gas outlets of an oil gas heater, 40, oil gas outlets of an oil gas heater, 41, condensed oil inlets and condensed oil outlets of the heat exchanger, an S conveying system, an L condensing system, an X adsorption system and an adsorption system.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1, 2 and 3, a fixed type aviation kerosene oil gas recovery system comprises three modules, namely a conveying system S, a condensing system L and an adsorption system X, wherein the conveying system S comprises an oil gas collecting system 1, a gas-liquid separation system 2 and a conveying power system; the condensing system L comprises a three-stage independent refrigerating system consisting of a first-stage refrigerating system, a second-stage refrigerating system and a third-stage refrigerating system, an oil storage tank 9 and an oil discharge system; the adsorption system X comprises an adsorption tank A14, an adsorption tank B15, a vacuum pump 23, a chimney 22, an adsorption electric valve and a desorption electric valve I;
the inlet of the oil-gas collection system 1 of the conveying system S is connected with the outlet of the oil-gas conveying pipeline 26, and the outlet of the oil-gas collection system 1 is connected with the gas-liquid separation system 2 through a pipeline; carry driving system include spark arrester 3 and fan 4, spark arrester 3 sets up the oil gas entrance at fan 4, the other end and the gas-liquid separation system 2 of spark arrester 3 are connected, fan 4 is the roots blower, fan 4 and the hot side of the first order refrigerating system's of condensing system L evaporimeter I5 are connected, gas-liquid separation system 2 can play gas-liquid separation, the effect of impurity deposit and buffering, oil gas collection system 1 makes oil gas can get into oil gas recovery system smoothly with the oil gas pipeline 26 butt joint of oil loading and unloading mouth.
The first-stage refrigeration system and the second-stage refrigeration system of the condensation system L are respectively a single-stage refrigeration circulation system formed by sequentially connecting an evaporator I5, an evaporator II 6, a compressor 31, a condenser 32 and an expansion valve 36, the second-stage refrigeration system further comprises a gas-liquid separator 30, a liquid storage tank 33, a heat exchanger 34, an oil-gas heater 8 and a filter 35, the gas-liquid separator 30 is connected between the evaporator II 6 and the compressor 31, the liquid storage tank 33 is connected between the condenser 32 and the expansion valve 36, the heat exchanger 34 is connected between the compressor 31 and the expansion valve 36, the oil-gas heater 8 is connected between the heat exchanger 34 and the expansion valve 36, and the filter 35 is connected between the liquid; the third-stage refrigeration system is a cascade refrigeration system and comprises a high-temperature-stage refrigeration system and a low-temperature-stage refrigeration system; the evaporator I5 of the first-stage refrigeration system, the evaporator II 6 of the second-stage refrigeration system and the evaporator III 7 of the third-stage refrigeration system are sequentially connected, and the evaporators are respectively provided with a condensed oil outlet.
The cold side of the heat exchanger 34 is connected with a condensed oil outlet of an evaporator II 6 of the second-stage refrigeration system and a condensed oil outlet of an evaporator III 7 of the third-stage refrigeration system, the hot side of the heat exchanger 34 is connected with an acquisition inlet of the oil storage tank 9, condensed oil enters the heat exchanger 34 of the second-stage refrigeration system through a heat exchanger condensed oil inlet 41 and then exchanges heat with refrigerant in a liquid pipe of the second-stage refrigeration system, heat released by the refrigerant condensation is recovered by the condensed oil to realize temperature rise, and the heat rises and then enters the oil storage tank 9 through a heat exchanger condensed oil outlet 42.
The cold side of oil gas heater 8 be connected with the cold side of third stage refrigerating system's evaporimeter III 7, oil gas heater 8's hot side and adsorption system X's entry linkage, oil gas heater 8 is used for getting into oil gas heater 8 after the oil gas that third stage refrigerating system's evaporimeter III 7 was handled and refrigerant heat transfer in the second stage refrigerating system liquid pipe for in oil gas gets into the adsorption tank again after rising the temperature, avoid microthermal oil gas to influence adsorption efficiency.
The second-stage refrigeration system evaporator II 6 and the third-stage refrigeration system evaporator III 7 are provided with a heater 13 or a heater 13 and a pressure difference sensor electrically connected with the heater 13, and are used for preventing the condition that the temperature in the second-stage refrigeration system evaporator II 6 and the third-stage refrigeration system evaporator III 7 is too low to cause frosting or ice blockage, and controlling the start and stop of the heater 13 according to a pressure difference signal detected by the pressure difference sensor to realize a timed defrosting function.
The oil storage tank 9 is provided with a collection inlet and a discharge outlet, the collection inlet is respectively connected with the condensed oil outlets of the three evaporators, and the discharge outlet is connected with an oil discharge system; the oil discharge system is provided with an oil pump 11, a discharge filter 10 and a discharge electric valve; a liquid level meter is arranged in the oil storage tank 9 and is electrically connected with the oil pump 11, when the liquid level meter detects that the liquid level in the oil storage tank 9 reaches a set maximum height, the oil pump 11 is automatically started, condensed oil in the oil storage tank 9 passes through a discharge electric valve and then is filtered and discharged into an oil tank 29 designated by a user through a discharge filter 10 until the liquid level in the oil storage tank 9 is lower than the set minimum height; the oil storage tank 9 is also provided with a branch condensed oil interface 12 which is connected with an evaporator condensed oil outlet of a branch oil gas recovery device or oil storage tanks of other oil gas recovery devices and is used for temporarily discharging branch condensed oil 27 condensed by evaporators of other oil gas recovery devices into the oil storage tank 9 for storage; the branch oil gas recovery device can be a movable oil gas recovery device, and when an oil storage tank of the movable oil gas recovery device is in butt joint with the branch condensate oil interface 12 to realize the emptying of the branch condensate oil 27, the movable oil gas recovery device can continue the oil gas recovery work.
The adsorption system X is provided with two adsorption tanks I14 and II 15, the adsorption tanks I14 and II 15 are respectively provided with an adsorption inlet, an adsorption outlet and a desorption outlet, the adsorption inlet is connected with an oil gas heater 8 connected with the cold side of a third-stage refrigeration system evaporator III 7, the adsorption outlet is connected with a chimney 22, the desorption outlet is connected with an inlet of a vacuum pump 23, an outlet of the vacuum pump 23 is connected with an oil gas conveying pipeline 26, the adsorption inlet and the adsorption outlet of the adsorption tanks I14 and II 15 are respectively provided with an adsorption electric valve I16, an adsorption electric valve II 17, an adsorption electric valve III 19 and an adsorption electric valve IV 20, the desorption outlet is provided with a desorption electric valve I18 and a desorption electric valve II 21, the inlet of the vacuum pump 23 is also provided with a branch desorption interface 24 for connecting with the desorption outlet of the adsorption tanks of the branch oil gas recovery device, and the branch oil gas recovery device can be a movable oil, after the adsorption tank of the mobile oil gas recovery device is in butt joint with the branch desorption interface 24 to realize desorption, the vacuum pump 23 is started, the oil gas in the branch adsorption tank desorption oil gas 28 is desorbed after passing through the vacuum pump desorption electric valve 25, and the adsorbent in the adsorption tank of the branch oil gas recovery device is reused.
The specific working process of the invention is as follows:
in the embodiment, oil gas from the oil gas conveying pipeline 26 passes through the oil gas collecting system 1 and the gas-liquid separation system 2 of the conveying system and then is blown into the evaporator I5 of the first-stage refrigeration system through the fan 4, the fan 4 in the embodiment is a Roots blower, the temperature of the oil gas is treated to 3-7 ℃, and condensed oil (mainly water and heavy components) flows out from a condensed oil outlet arranged on the evaporator I5 of the first-stage refrigeration system and enters the oil storage tank 9 for storage through a collecting inlet arranged on the oil storage tank 9; the oil gas treated by the evaporator I5 of the first stage refrigeration system enters the evaporator II 6 of the second stage refrigeration system through an oil gas inlet 37 of the evaporator II, the temperature of the oil gas is treated to-20 to-30 ℃, condensed oil (most of C5 to C7 oil gas) flows out from a condensed oil outlet arranged on the evaporator II 6 of the second stage refrigeration system, meanwhile, the oil gas treated by the evaporator II 6 of the second stage refrigeration system enters the evaporator III 7 of the third stage refrigeration system through an oil gas outlet 38 of the evaporator II, the temperature of the oil gas is treated to-55 to-65 ℃, condensed hydrocarbon oil (mainly light components) flows out from a condensed oil outlet arranged on the evaporator III 7 of the third stage refrigeration system, and the condensed oil temperatures condensed from the evaporators of the first stage refrigeration system, the second stage refrigeration system and the third stage refrigeration system are different, when the condensed oil with different temperatures is mixed in the temporary oil storage tank, the high-melting-point oil component is solidified to block a connecting pipeline of the temporary oil storage tank, therefore, the condensed oil condensed in the evaporator II 6 of the second-stage refrigeration system and the evaporator III 7 of the third-stage refrigeration system needs to be heated, namely, the condensed oil flows into the heat exchanger 34 of the second-stage refrigeration system to be heated, the refrigerant in the liquid pipe of the second-stage refrigeration system is condensed in the heat exchanger 34 to release heat, the condensed oil condensed out by the evaporator II 6 of the second-stage refrigeration system and the evaporator III 7 of the third-stage refrigeration system enters the heat exchanger 34 of the second-stage refrigeration system, the condensed oil recovers the heat released by the condensation of the refrigerant, the temperature is raised, and the condensed oil enters the oil storage tank 9 to be stored.
The number of the heat exchangers 34 can be one or more, and when the number of the heat exchangers 34 is one, the heat exchangers 34 are connected with the condenser 32 in series or in parallel; when the number of the heat exchangers 34 is multiple, the plurality of heat exchangers 34 are connected in parallel or in series to form a heat exchanger group, and the heat exchanger group is connected in series or in parallel with the condenser 32; similarly, the heat exchanger 34 is connected with the oil gas heater 8 in series when one heat exchanger is used, a plurality of heat exchangers 34 are connected in parallel or in series to form a heat exchanger group, and the heat exchanger group is connected with the oil gas heater 8 in series. In this embodiment, taking two heat exchangers 34 as an example, the two heat exchangers 34 are connected in series to form a heat exchanger group, the heat exchanger group is further connected in series with the condenser 32, the condensed oil condensed by the evaporator ii 6 of the second-stage refrigeration system enters the heat exchanger close to the compressor 31 to exchange heat with the refrigerant of the second-stage refrigeration system, and the condensed oil condensed by the evaporator iii 7 of the third-stage refrigeration system enters the heat exchanger far from the compressor 31 to exchange heat with the refrigerant of the second-stage refrigeration system.
In the embodiment, the evaporator I5, the evaporator II 6, the evaporator III 7 and the oil-gas heater 8 can adopt a shell-and-tube type; the condenser 32 can be an air-cooled condenser and can adopt a tube-fin heat exchange tube; the heat exchanger 34 may be a plate heat exchanger; the heaters 13 arranged on the evaporator II 6 of the second-stage refrigeration system and the evaporator III 7 of the third-stage refrigeration system can be electric tracing bands, and particularly, the electric tracing bands are wound on the surfaces of the evaporator II 6 of the second-stage refrigeration system and the evaporator III 7 of the third-stage refrigeration system.
When the level gauge of the oil reservoir 9 detects that the liquid level in the reservoir reaches the set maximum level, the oil pump 11 of the oil discharge system is automatically turned on to discharge the condensed oil in the oil reservoir 9 to the user-specified oil tank 29 through the discharge outlet until the liquid level in the oil reservoir 9 is lower than the set minimum level.
Oil gas after III 7 processing of evaporator through third level refrigerating system rises temperature in getting into oil gas heater 8 through oil gas heater oil gas entry 39, adsorbs in getting into adsorption system X through oil gas heater oil gas export 40 after rising temperature, avoids microthermal oil gas direct entering to influence adsorption efficiency in the adsorption tank, and the process that oil gas heater 8 went on rising temperature is: the refrigerant of the second-stage refrigeration system enters the oil-gas heater 8 to be further condensed and release heat, the oil gas treated by the evaporator III 7 of the third-stage refrigeration system enters the oil-gas heater 8 through the oil-gas inlet 39 of the oil-gas heater, and the heat released by the condensation of the refrigerant is recovered to realize temperature rise.
The oil gas adsorption process is as follows: opening an adsorption electric valve I16 and an adsorption electric valve II 17 at an adsorption inlet and an adsorption outlet of an adsorption tank A14, closing the other electric valves, allowing the oil gas treated by an evaporator III 7 of a third-stage refrigeration system to enter an adsorption tank A14, allowing light hydrocarbon components in the oil gas to be adsorbed by an adsorbent in an adsorption tank A14, opening an adsorption electric valve III 19 and an adsorption electric valve IV 20 at an adsorption inlet and an adsorption outlet of an adsorption tank B15 when the adsorbent in the adsorption tank A14 is saturated or nearly saturated, allowing the oil gas treated by the evaporator III 7 of the third-stage refrigeration system to enter an adsorption tank B15, allowing the light hydrocarbon components in the oil gas to be adsorbed by the adsorbent in an adsorption tank B15, closing the adsorption electric valve I16 and the adsorption electric valve II 17 at the adsorption inlet and the adsorption outlet of the adsorption tank A14, opening a desorption electric valve I18 at a desorption outlet of the adsorption tank A14, and opening a vacuum pump 23, desorbing the adsorbent in the adsorption tank A14, returning the desorbed oil gas to the oil gas conveying pipeline 26 to be mixed with crude oil gas, and then returning the mixture to the oil gas recovery system for recovery; when the adsorbent in the adsorption tank B15 is saturated or is close to saturation, the adsorbent in the adsorption tank A14 finishes desorption and is in a standby state, and at the moment, the adsorption electric valve I16 and the adsorption electric valve II 17 of the adsorption tank A14 are opened again, so that the oil gas enters the adsorption tank A and is continuously adsorbed by the adsorbent; meanwhile, an adsorption electric valve III 19 and an adsorption electric valve IV 20 of the adsorption tank B are closed, a desorption electric valve II 21 of the adsorption tank B15 is opened, the vacuum pump 23 is kept on, and the adsorbent in the adsorption tank B15 is desorbed, so that the rotation between the adsorption tank A14 and the adsorption tank B15 is realized, the oil gas treated by the evaporator III 7 of the third-stage refrigeration system is continuously adsorbed in turn, and the tail gas obtained after the oil gas is adsorbed by the adsorption tank A14 and the adsorption tank B15 is discharged into the atmosphere through a chimney 22.
The present invention is not limited to the prior art, and the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. The utility model provides a fixed aviation kerosene oil gas recovery system, includes three big modules of conveying system (S), condensing system (L) and adsorption system (X), and conveying system (S) includes oil gas collection system (1), gas-liquid separation system (2) and carries driving system, characterized by: the condensing system (L) comprises a three-stage independent refrigerating system consisting of a first-stage refrigerating system, a second-stage refrigerating system and a third-stage refrigerating system, an oil storage tank (9) and an oil discharge system; the adsorption system (X) comprises an adsorption tank, a vacuum pump (23), a chimney (22), an adsorption electric valve and a desorption electric valve;
the first stage refrigeration system and the second stage refrigeration system of the condensation system (L) are respectively a single-stage refrigeration circulation system formed by sequentially connecting an evaporator I (5), an evaporator II (6), a compressor (31), a condenser (32) and an expansion valve (36), the second-stage refrigeration system further comprises a gas-liquid separator (30), a liquid storage tank (33), a heat exchanger (34), an oil-gas heater (8) and a filter (35), the gas-liquid separator (30) is connected between the evaporator II (6) and the compressor (31), the liquid storage tank (33) is connected between the condenser (32) and the expansion valve (36), the heat exchanger (34) is connected between the compressor (31) and the expansion valve (36), the oil-gas heater (8) is connected between the heat exchanger (34) and the expansion valve (36), and the filter (35) is connected between the liquid storage tank (33) and the expansion valve (35); the third-stage refrigeration system is a cascade refrigeration system and comprises a high-temperature-stage refrigeration system and a low-temperature-stage refrigeration system; the evaporator I (5) of the first-stage refrigeration system, the evaporator II (6) of the second-stage refrigeration system and the evaporator III (7) of the third-stage refrigeration system are sequentially connected, and the evaporator I (5), the evaporator II (6) and the evaporator III (7) are respectively provided with a condensed oil outlet; the oil storage tank (9) is provided with a collection inlet and a discharge outlet, the collection inlet is respectively connected with the condensed oil outlets of the three evaporators, and the discharge outlet is connected with an oil discharge system; the oil discharge system is provided with an oil pump (11) and a discharge filter (10);
adsorption system (X) set up two adsorption tanks, adsorption tank A (14) and adsorption tank B (15), every adsorption tank all is equipped with the absorption entry, adsorb export and desorption export, the absorption entry is connected with the cold side of third level refrigerating system's evaporimeter III (7), the absorption export is connected with chimney (22), the entry linkage of desorption export and vacuum pump (23), the export and the oil gas pipeline (26) of vacuum pump (23) are connected, the absorption entry is equipped with the absorption motorised valve with the absorption export, the desorption export is equipped with the desorption motorised valve.
2. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the inlet of the oil-gas collecting system (1) of the conveying system (S) is connected with the outlet of the oil-gas conveying pipeline (26), and the outlet of the oil-gas collecting system (1) is connected with the gas-liquid separation system (2) through a pipeline; one end of the conveying power system is connected with the gas-liquid separation system (2), and the other end of the conveying power system is connected with the condensation system (L).
3. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the cold side of the oil gas heater (8) is connected with the cold side of the evaporator III (7) of the third-stage refrigeration system, and the hot side of the oil gas heater (8) is connected with the inlet of the adsorption system (X).
4. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the cold side of the heat exchanger (34) is connected with a condensed oil outlet of an evaporator II (6) of the second-stage refrigeration system and a condensed oil outlet of an evaporator III (7) of the third-stage refrigeration system, and the hot side of the heat exchanger (34) is connected with a collecting inlet of the oil storage tank (9).
5. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the evaporator II (6) of the second-stage refrigeration system and the evaporator III (7) of the third-stage refrigeration system are provided with a heater (13) for preventing the condition that frost or ice is blocked due to the fact that the temperature in the evaporators is too low, or a pressure difference sensor for controlling the on-off of the heater, wherein the heater (13) is electrically connected with the heater, and the heater (13) is an electric tracing band.
6. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the oil storage tank (9) is internally provided with a liquid level meter which is electrically connected with an oil pump (11) of an oil discharge system arranged at a discharge outlet of the oil storage tank (9).
7. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the oil storage tank (9) is provided with a branch condensed oil interface (12) which is used for connecting an evaporator condensed oil outlet of a branch oil gas recovery device or oil storage tanks of other oil gas recovery devices.
8. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: and the inlet of the vacuum pump (23) is provided with a branch desorption interface which is connected with the desorption outlet of the adsorption tank of the branch oil-gas recovery device in a butt joint manner.
9. A stationary aviation kerosene oil and gas recovery system according to claim 1, wherein: the power transmission system comprises a fan (4) and a flame arrester (3), and the fan (4) is connected with the hot side of an evaporator I (5) of the first-stage refrigeration system.
10. A stationary aviation kerosene oil and gas recovery system according to claim 9, wherein: the blower (4) is a Roots blower, and the flame arrester (3) is arranged at an oil gas inlet of the blower (4).
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| CN202010260552.1A CN111234859A (en) | 2020-04-03 | 2020-04-03 | Fixed aviation kerosene oil gas recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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