CN111249852B - Regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration - Google Patents
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 71
- 238000005057 refrigeration Methods 0.000 title claims abstract description 54
- 238000009833 condensation Methods 0.000 title claims abstract description 41
- 230000005494 condensation Effects 0.000 title claims abstract description 41
- 238000011084 recovery Methods 0.000 title claims abstract description 40
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 33
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 153
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 151
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 109
- 238000000926 separation method Methods 0.000 claims abstract description 36
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- 239000000463 material Substances 0.000 claims description 13
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
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Abstract
The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration comprises a mixed working medium refrigerating machine unit, a high-temperature-stage separation unit and a low-temperature-stage separation unit, adopts a mixed working medium throttling refrigeration technology, has a simple and reliable refrigerating machine structure, can realize lower cooling temperature below-180 ℃ and higher efficiency, can reach the emission standard below 50mg/m3 of non-methane total hydrocarbon without additionally arranging other purification devices, and recycles the cold energy of clean air and hydrocarbon to cool the oil gas VOCs, further reduces the cold energy requirement and improves the energy-saving effect.
Description
Technical Field
The invention relates to the technical field of mixed working medium refrigeration precooling, in particular to a regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration.
Background
In the production, storage and use processes of oil products, a large amount of light hydrocarbon components volatilize into the air to form oil gas VOCs (volatile organic chemicals, VOCs), so that serious environmental pollution and oil gas resource waste are caused, and the recovery of the oil gas VOCs has huge environmental protection and economic values. Emission concentration of non-methane total hydrocarbons (NMHC) specified in petrochemical industry pollutant emission standard (GB-31571) in China should be lower than 120mg/m3, and removal efficiency should be higher than 95%; the NMHC emission concentration of China petrochemical regulation is lower than 50mg/m 3.
The current methods for treating oil gas VOCs are divided into incineration methods and non-incineration methods, wherein the non-incineration methods can recover hydrocarbons in the oil gas VOCs. The recovery of the oil gas VOCs mainly comprises a condensation method, an absorption method, an adsorption method, a membrane separation method and a combination of the methods. The absorption method, the adsorption method and the membrane separation method have relatively simple structures, but have the problems of low recovery rate, easy heating of adsorption, limited service life of an absorbent/adsorbent/separation membrane and the like. The condensation method can directly and continuously recover hydrocarbons, but the initial investment of matched refrigeration equipment is high, the energy consumption is high, the lower emission standard is difficult to realize when the refrigeration temperature is high, and the combination with the adsorption and other processes is required, so that the system structure is complex, and all parts are difficult to match.
The existing oil gas VOCs condensation recovery system mostly adopts two-to-three-stage cascade refrigeration, the lowest temperature is mostly above-100 ℃, and generally corresponds to 25000mg/m3The emission standard of (1). And 120mg/m3The following emission standards require the achievement of low temperatures below-170 ℃. However, the three-stage cascade refrigeration is difficult to realize low temperature below-120 ℃, and meanwhile, the structure is complex, interstage matching is difficult, and the reliability is not high. The direct cooling of the oil gas VOCs by liquid nitrogen can seriously waste high-grade low-temperature cold energy; if the energy consumption for producing the liquid nitrogen is taken into account, the overall energy consumption of the system is large, and the requirements of energy conservation and emission reduction are not met.
In addition, a large amount of low-temperature clean air is generated after the oil gas VOCs are recovered, and the existing recovery method generally directly discharges the low-temperature clean air, so that a large amount of cold energy is wasted. And the cold energy contained in the clean air is recovered through the heat regeneration process, so that the cold quantity requirement of the oil gas VOCs cooling process can be greatly reduced, and the energy consumption of the system is reduced.
The mixed working medium refrigeration technology can efficiently meet the deep refrigeration requirement of-40 ℃ to-180 ℃, and only adopts a single compressor, so that the structure is simple and reliable, and the cost is lower.
Therefore, an efficient oil gas VOCs condensation and recovery process which can efficiently perform low-temperature refrigeration, can recover the residual cold of clean air and can realize lower hydrocarbon residues without depending on other purification methods needs to be provided based on a mixed working medium refrigeration technology.
Disclosure of Invention
Therefore, it is necessary to provide a regenerative oil gas VOCs condensation recovery system capable of realizing mixed working medium refrigeration of a high-efficiency oil gas VOCs condensation recovery process with low hydrocarbon residue, aiming at the defects existing in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a regenerative oil gas VOCs (volatile organic compounds) condensation recovery system for mixed working medium refrigeration, which comprises a mixed working medium refrigerator unit, a high-temperature-stage separation unit and a low-temperature-stage separation unit, wherein the high-temperature-stage separation unit comprises a high-temperature-stage oil gas regenerator, a high-temperature hydrocarbon separator and a high-temperature hydrocarbon throttling element, the low-temperature-stage separation unit comprises a low-temperature-stage oil gas regenerator, a low-temperature hydrocarbon separator, a low-temperature air throttling element and a low-temperature hydrocarbon throttling element, and the regenerative oil gas VOCs condensation recovery system comprises:
the mixed working medium main cooling circulation in the mixed working medium refrigerating machine unit can adopt various circulation configurations such as once throttling circulation, separation circulation and the like, and refrigerating capacity is output through the low-temperature-stage evaporator and the high-temperature-stage evaporator;
the oil gas pressurizing unit comprises an oil gas pressurizing machine and an after cooler, and oil gas VOCs enter the after cooler for cooling after being pressurized to a certain optimized pressure by the oil gas pressurizing machine and then enter the high-temperature-level oil gas heat regenerator. Opening, closing or removing the oil gas pressurization unit according to the system operation condition;
cooling the oil gas VOCs to-10 to-80 ℃ after passing through the high-temperature-stage oil gas heat regenerator, allowing the cooled oil gas VOCs to enter the high-temperature hydrocarbon separator, separating hydrocarbons in the oil gas VOCs by the high-temperature hydrocarbon separator, and allowing the purified material to flow out of the top of the high-temperature hydrocarbon separator and enter the low-temperature-stage separation unit; separated hydrocarbons flow out from the bottom of the high-temperature hydrocarbon separator and are directly recovered after being throttled by the high-temperature hydrocarbon throttling element;
the purified material enters the low-temperature-level oil-gas heat regenerator, the temperature is cooled to-100 ℃ to-180 ℃, the cooled material enters the low-temperature hydrocarbon separator, the low-temperature hydrocarbon separator separates hydrocarbons of the material, and clean air flows out of the top of the low-temperature hydrocarbon separator, is throttled by the low-temperature air throttling element and then sequentially enters the low-temperature-level oil-gas heat regenerator and the high-temperature-level oil-gas heat regenerator to provide cold energy; separated hydrocarbons flow out of the bottom of the low-temperature hydrocarbon separator and are directly recovered after being throttled by the low-temperature hydrocarbon throttling element;
the regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration can be provided with a plurality of separation units.
In some preferred embodiments, a hydrocarbon runner is arranged in each of the high-temperature-stage oil gas regenerator and the low-temperature-stage oil gas regenerator, and is used for recovering cold contained in the liquid hydrocarbon. The high-temperature hydrocarbon separator separates hydrocarbons in the oil gas VOCs, and the purified material flows out of the top of the high-temperature hydrocarbon separator and enters the low-temperature-stage oil gas regenerative and rectification unit; separated hydrocarbons flow out from the bottom of the high-temperature hydrocarbon separator and enter the high-temperature-stage oil-gas regenerator after being throttled by the high-temperature hydrocarbon throttling element so as to provide cold energy; the low-temperature hydrocarbon separator separates hydrocarbons of the materials, and clean air flows out of the top of the low-temperature hydrocarbon separator, is throttled by the low-temperature air throttling element and then sequentially enters the low-temperature-stage oil-gas heat regenerator and the high-temperature-stage oil-gas heat regenerator to provide cold; the separated hydrocarbons flow out from the bottom of the low-temperature hydrocarbon separator, are throttled by the low-temperature hydrocarbon throttling element and then sequentially enter the low-temperature-stage oil-gas regenerator and the high-temperature-stage oil-gas regenerator to provide cold.
In some preferred embodiments, the high-temperature hydrocarbon separator includes a high-temperature-stage rectification tower and a high-temperature-stage overhead condenser, the cooled oil gas VOC enters the high-temperature-stage rectification tower to separate hydrocarbons, and the purified material flows out from the top of the high-temperature-stage overhead condenser; and the separated hydrocarbons flow out from the bottom of the high-temperature stage rectifying tower. The refrigerating capacity required by the high-temperature-stage tower top condenser is provided by a high-temperature-stage evaporator of the mixed working medium refrigerating machine. The high-temperature-stage rectifying tower can be a plate tower, a packed tower, a flash separator or a fractional condensation separator.
The low-temperature hydrocarbon separator comprises a low-temperature rectifying tower and a low-temperature tower top condenser, the cooled material enters the low-temperature rectifying tower to separate hydrocarbons, and clean air flows out of the tower top of the low-temperature rectifying tower; hydrocarbons flow out of the bottom of the low-temperature-stage rectifying tower. The refrigerating capacity required by the low-temperature-level tower top condenser is provided by a low-temperature-level evaporator of the mixed working medium refrigerating machine. The low-temperature-stage rectifying tower can be a plate tower, a packed tower, a flash separator or a fractional condensation separator.
The low-temperature-level evaporator and the low-temperature-level tower top condenser are integrated into a heat exchanger, and the high-temperature-level evaporator and the high-temperature-level tower top condenser are integrated into another heat exchanger.
In some preferred embodiments, a heavy hydrocarbon separation unit is disposed between the high-temperature stage separation unit and the oil gas pressurization unit, the heavy hydrocarbon separation unit includes a primary oil gas cooler, a heavy hydrocarbon separator and a heavy hydrocarbon throttling element, the oil gas VOCs are cooled in the primary oil gas cooler and then enter the heavy hydrocarbon separator for separation, the separated gas phase continues to enter the high-temperature stage oil gas regenerator, and the separated liquid phase heavy hydrocarbon is discharged and recovered after being throttled by the heavy hydrocarbon throttling element. The primary oil gas cooler is provided with cold energy by a water chilling unit or the mixed working medium refrigerating machine unit.
In some preferred embodiments, a pre-cooling cycle is arranged in the mixed working medium refrigerating unit, the high-temperature-stage evaporator is arranged at the cold end of the pre-cooling cycle and provides refrigerating capacity for the high-temperature-stage hydrocarbon separator, and the low-temperature-stage evaporator is arranged at the cold end of the main mixed working medium cycle and provides refrigerating capacity for the low-temperature-stage hydrocarbon separator; the pre-cooling circulation can adopt vapor compression refrigeration circulation, absorption refrigeration circulation, mixed working medium refrigeration circulation or a commercial water chilling unit.
The invention adopts the technical scheme that the method has the advantages that:
the regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the invention adopts a mixed working medium throttling refrigeration technology, the refrigerator has a simple and reliable structure, can realize lower cooling temperature of-180 ℃ and below and higher efficiency, can reach the emission standard of non-methane total hydrocarbon below 50mg/m3 without additionally arranging other purification devices, and recycles the cold energy of clean air and hydrocarbon to cool the oil gas VOCs, thereby further reducing the cold energy requirement and improving the energy-saving effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a flow structure of a regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a regenerative oil-gas VOCs condensation recovery system using mixed refrigerant for refrigeration provided in embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a regenerative oil-gas VOCs condensation recovery system using mixed refrigerant for refrigeration provided in embodiment 3 of the present invention.
FIG. 4 is a schematic diagram of the structure of a heavy hydrocarbon separation unit provided in example 4 of the present invention.
Fig. 5 is a schematic structural diagram of a mixed refrigerant refrigerating unit provided in embodiment 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a regenerative oil-gas VOCs condensing and recycling system for mixed refrigerant refrigeration provided in embodiment 1 of the present invention includes: the system also comprises an oil-gas pressurizing unit 1, a mixed working medium refrigerating machine unit 2, a high-temperature-level separation unit 3 and a low-temperature-level separation unit 4.
The mixed working medium refrigerating unit 2 produces refrigerating capacity through the low-temperature-stage evaporator 201 and the high-temperature-stage evaporator 202.
The oil gas pressurizing unit 1 comprises an oil gas pressurizing machine 101 and an after cooler 102, and oil gas VOCs enter the after cooler 102 for cooling after being pressurized by the oil gas pressurizing machine 101 and then enter the high-temperature-level oil gas heat regenerator 301.
It will be appreciated that the oil and gas booster 101 boosts the oil and gas VOCs to an optimal lower pressure, typically below 8bar, and then enters the after cooler 102 for cooling and then enters the high temperature stage oil and gas regenerator 301.
The mixed working medium refrigerating unit 2 outputs refrigerating capacity through the low-temperature-stage evaporator 201 and the high-temperature-stage evaporator 202.
The high-temperature-stage separation unit 3 comprises a high-temperature-stage oil-gas regenerator 301, a high-temperature hydrocarbon separator 31 and a high-temperature hydrocarbon throttling element 304; the low temperature stage separation unit 4 comprises a low temperature stage oil gas regenerator 401, a low temperature hydrocarbon separator 41, a low temperature air throttling element 405 and a low temperature hydrocarbon throttling element 404.
After passing through the high-temperature-stage oil-gas heat regenerator 301, the oil-gas VOCs are cooled to-10 ℃ to-80 ℃, the cooled oil-gas VOCs enter the high-temperature hydrocarbon separator 31, the hydrocarbons in the oil-gas VOCs are separated by the high-temperature hydrocarbon separator 31, and the purified material flows out of the top of the high-temperature hydrocarbon separator 31 and enters the low-temperature-stage oil-gas heat regeneration and rectification unit; separated hydrocarbons flow out from the bottom of the high-temperature hydrocarbon separator 31 and are directly recovered after being throttled by the high-temperature hydrocarbon throttling element 304.
The temperature of the purified material is cooled to-100 ℃ to-180 ℃ after entering the low-temperature-stage oil-gas heat regenerator 401, the cooled material enters the low-temperature hydrocarbon separator 41, the low-temperature hydrocarbon separator 41 separates hydrocarbons of the material, and clean air flows out from the top of the low-temperature hydrocarbon separator 41, is throttled by the first low-temperature air throttling element 405 and then sequentially enters the low-temperature-stage oil-gas heat regenerator 401 and the high-temperature-stage oil-gas heat regenerator 301 to provide cold energy; separated hydrocarbons flow out from the bottom of the cryogenic hydrocarbon separator 41 and are directly recovered after being throttled by the cryogenic hydrocarbon throttling element 404.
The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the embodiment of the invention adopts mixed working medium throttling refrigeration technology, the refrigerator has simple and reliable structure, can realize lower cooling temperature of-180 ℃ and below and higher efficiency, and can reach 50mg/m of non-methane total hydrocarbon without additionally arranging other purification devices3The oil gas VOCs are cooled by recycling the cold energy of clean air and hydrocarbons according to the following emission standard, so that the cold energy requirement is further reduced, and the energy-saving effect is improved.
Example 2
Fig. 2 is a schematic structural diagram of a regenerative oil-gas VOCs condensation recovery system for mixed refrigerant refrigeration according to embodiment 2 of the present invention.
The difference from the embodiment 1 is that in the regenerative oil gas VOCs condensation recovery system using mixed refrigerant for refrigeration provided in embodiment 2 of the present invention, hydrocarbon flow channels are provided in both the high-temperature stage oil gas regenerator 301 and the low-temperature stage oil gas regenerator 401, and are used for recovering the cold energy contained in the liquid hydrocarbons. The hydrocarbons separated by the high-temperature hydrocarbon separator 31 enter the high-temperature-stage oil-gas regenerator 301 after being throttled by the high-temperature hydrocarbon throttling element 304 to provide cold energy; the hydrocarbons separated by the low-temperature hydrocarbon separator 41 are throttled by the low-temperature hydrocarbon throttling element 404 and then sequentially enter the low-temperature stage oil-gas heat regenerator 401 and the high-temperature stage oil-gas heat regenerator 301 to provide cooling capacity.
Other working modes can refer to embodiment 1, and are not described herein.
The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the embodiment 2 of the invention further improves the energy-saving effect by recovering the residual cold quantity of hydrocarbons.
Example 3
Fig. 3 is a schematic structural diagram of a regenerative oil-gas VOCs condensation recovery system for mixed refrigerant refrigeration according to embodiment 3 of the present invention.
The difference from the above embodiment 1 is that, in the regenerative oil gas VOCs condensation recovery system using mixed working medium refrigeration provided in embodiment 3 of the present invention, the high-temperature hydrocarbon separator 31 includes a high-temperature-stage rectification tower 302 and a high-temperature-stage tower top condenser 303, the cooled oil gas VOCs enter the high-temperature-stage rectification tower 302 to separate hydrocarbons, and the purified material flows out from the tower top of the high-temperature-stage tower top condenser 303; the separated hydrocarbons flow out through the bottom of the high temperature stage rectification column 302. The high-temperature stage rectification column 302 may use a plate column, a packed column, a flash separator, or a fractional condensation separator.
The low-temperature hydrocarbon separator 41 comprises a low-temperature rectification tower 402 and a low-temperature overhead condenser 403, the cooled material enters the low-temperature rectification tower 402 to separate the hydrocarbon, and clean air flows out from the top of the low-temperature rectification tower 402; hydrocarbons flow from the bottom of the low temperature stage rectification column 402. The low temperature stage rectification column 402 may use a tray column, a packed column, a flash separator, or a fractional condensation separator.
It is understood that the high-temperature-stage overhead condenser 303 can cool the material from the top of the high-temperature-stage rectification column 302, condense the hydrocarbons and return all of them to the high-temperature-stage rectification column 302, and the required cooling capacity is provided by the high-temperature-stage evaporator 202. The low-temperature-stage overhead condenser 403 can cool the materials from the top of the low-temperature-stage rectifying tower 402, condense the hydrocarbons and then completely reflux the hydrocarbons to the low-temperature-stage rectifying tower 402, and the required cold energy is provided by the low-temperature-stage evaporator 201.
It can be understood that the low-temperature-stage evaporator 201 and the low-temperature-stage overhead condenser 403 are integrated into a heat exchanger, and the low-temperature mixed working medium and the oil gas VOCs are respectively arranged on two sides of the heat exchanger; the high-temperature-stage evaporator 202 and the high-temperature-stage tower top condenser 303 are also integrated into a heat exchanger, and the low-temperature mixed working medium and the oil gas VOCs material are respectively arranged on two sides of the heat exchanger.
Other working modes can refer to embodiment 1, and are not described herein.
The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the embodiment 3 of the invention adopts the rectifying tower to separate hydrocarbons, and can improve the separation effect and the hydrocarbon recovery efficiency.
Example 4
Fig. 4 is a schematic structural diagram of a regenerative oil-gas VOCs condensing and recycling system for mixed refrigerant refrigeration according to embodiment 4 of the present invention.
The difference from embodiment 1 is that, in the regenerative oil-gas VOCs condensation recovery system using mixed refrigerant for refrigeration provided in embodiment 4 of the present invention, a heavy hydrocarbon separation unit may be disposed between the high-temperature stage separation unit 3 and the oil-gas pressurization unit 1, the heavy hydrocarbon separation unit includes a primary oil-gas cooler 501, a heavy hydrocarbon separator 502, and a heavy hydrocarbon throttling element 503, the oil-gas VOCs are cooled in the primary oil-gas cooler 501, and then enter the heavy hydrocarbon separator 502 for separation, the separated gas phase continues to enter the high-temperature stage oil-gas regenerator 301, and the separated liquid phase heavy hydrocarbons are throttled by the heavy hydrocarbon throttling element 503 and then discharged for recovery. The primary oil cooler 501 is provided with cooling capacity by a water chilling unit or the mixed working medium refrigerating unit 2.
Other working modes can refer to embodiment 1, and are not described herein.
According to the regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the embodiment 4 of the invention, the heavy hydrocarbon recovery unit is arranged, so that the capacity of the system for processing oil gas VOCs with high heavy hydrocarbon content is improved, and the risk of blockage caused by solid separated out from heavy hydrocarbon at low temperature is reduced.
Example 5
Fig. 5 is a schematic structural diagram of a regenerative oil-gas VOCs condensation recovery system for mixed refrigerant refrigeration according to embodiment 5 of the present invention.
The difference from the embodiment 1 is that the mixed working medium refrigerating unit 2 further includes a pre-cooling cycle 22, and the high-temperature-stage evaporator 202 is arranged at the cold end of the pre-cooling cycle 21 and provides the refrigeration capacity for the high-temperature-stage hydrocarbon separator 31; the low-temperature-stage evaporator 201 is arranged at the cold end of the mixed working medium main cycle 21 and provides refrigerating capacity for the low-temperature-stage hydrocarbon separator 41; the pre-cooling cycle 22 may be a vapor compression refrigeration cycle, an absorption refrigeration cycle, a mixed working medium refrigeration cycle, or a commercial chiller.
Other working modes can refer to embodiment 1, and are not described herein.
The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration provided by the embodiment 5 of the invention improves the capability of the system to adapt to higher environmental temperature by setting the precooling cycle, improves the adjusting capability of the system under the condition of larger load fluctuation, is beneficial to stably maintaining the mixed working medium refrigeration cycle under the optimal operating condition with higher efficiency, and improves the energy-saving effect.
It is to be understood that various features of the above-described embodiments may be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments may not be described in detail, but rather, all combinations of features may be considered to fall within the scope of the present disclosure unless there is a conflict between such combinations.
Of course, the regenerative oil gas VOCs condensation recovery system anode material refrigerated by the mixed working medium can also have various changes and modifications, and is not limited to the specific structure of the embodiment. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (5)
1. The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration is characterized by comprising a mixed working medium refrigerator unit, an oil gas pressurization unit, a high-temperature-stage separation unit and a low-temperature-stage separation unit, wherein the high-temperature-stage separation unit comprises a high-temperature-stage oil gas regenerator, a high-temperature hydrocarbon separator and a high-temperature hydrocarbon throttling element, and the low-temperature-stage separation unit comprises a low-temperature-stage oil gas regenerator, a low-temperature hydrocarbon separator, a low-temperature air throttling element and a low-temperature hydrocarbon throttling element, wherein:
the mixed working medium main cooling circulation in the mixed working medium refrigerating machine unit adopts a plurality of circulation configurations of primary throttling circulation and separation circulation, and refrigerating capacity is output through a low-temperature-stage evaporator and a high-temperature-stage evaporator;
the oil-gas pressurizing unit comprises an oil-gas pressurizing machine and an after-cooler, oil-gas VOCs are pressurized by the oil-gas pressurizing machine to a certain optimized pressure, then enter the after-cooler for cooling, then enter the high-temperature-level oil-gas heat regenerator, and are opened, closed or removed according to the system running condition;
the temperature of the oil gas VOCs is cooled to-10 to-80 ℃ after passing through the high-temperature-level oil gas heat regenerator, the cooled oil gas VOCs enter the high-temperature hydrocarbon separator, the hydrocarbons in the oil gas VOCs are separated by the high-temperature hydrocarbon separator, and the purified material flows out of the top of the high-temperature hydrocarbon separator and enters the low-temperature-level oil gas heat regeneration and rectification unit; the separated liquid hydrocarbon flows out from the bottom of the high-temperature hydrocarbon separator and is directly recovered after being throttled by the high-temperature hydrocarbon throttling element;
the purified material enters the low-temperature-level oil-gas heat regenerator, the temperature is cooled to-100 ℃ to-180 ℃, the cooled material enters the low-temperature hydrocarbon separator, the low-temperature hydrocarbon separator separates hydrocarbons of the material, and clean air flows out of the top of the low-temperature hydrocarbon separator, is throttled by the low-temperature air throttling element and then sequentially enters the low-temperature-level oil-gas heat regenerator and the high-temperature-level oil-gas heat regenerator to provide cold energy; separated hydrocarbons flow out of the bottom of the low-temperature hydrocarbon separator and are directly recovered after being throttled by the low-temperature hydrocarbon throttling element;
the regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration is provided with a plurality of separation units.
2. The mixed working medium refrigerated regenerative oil gas VOCs condensation recovery system of claim 1, wherein hydrocarbon flow channels are arranged in both the high-temperature stage oil gas regenerator and the low-temperature stage oil gas regenerator for recovering cold energy contained in the liquid hydrocarbons, and the hydrocarbons separated by the high-temperature hydrocarbon separator flow out from the bottom of the high-temperature hydrocarbon separator and enter the high-temperature stage oil gas regenerator after being throttled by the high-temperature hydrocarbon throttling element to provide cold energy; hydrocarbons separated by the low-temperature hydrocarbon separator flow out of the bottom of the low-temperature hydrocarbon separator, are throttled by the low-temperature hydrocarbon throttling element and then sequentially enter the low-temperature-stage oil-gas heat regenerator and the high-temperature-stage oil-gas heat regenerator to provide cooling capacity.
3. The mixed working medium refrigerated regenerative oil gas VOCs condensation recovery system of claim 1, wherein the high temperature hydrocarbon separator comprises a high temperature stage rectifying tower and a high temperature stage overhead condenser, the cooled oil gas VOCs enter the high temperature stage rectifying tower to separate hydrocarbons, and the purified material flows out from the top of the high temperature stage overhead condenser; separated hydrocarbons flow out from the bottom of the high-temperature-stage rectifying tower, the refrigerating capacity required by the high-temperature-stage overhead condenser is provided by a high-temperature-stage evaporator of the mixed working medium refrigerating machine, and the high-temperature-stage rectifying tower is a plate tower, a packed tower, a flash separator or a fractional condensation separator;
the low-temperature hydrocarbon separator comprises a low-temperature rectifying tower and a low-temperature tower top condenser, the cooled material enters the low-temperature rectifying tower to separate hydrocarbons, and clean air flows out of the tower top of the low-temperature rectifying tower and flows out of the low-temperature tower top condenser; the hydrocarbons are discharged from the bottom flow of the low-temperature-stage rectifying tower, the refrigerating capacity required by the low-temperature-stage overhead condenser is provided by a low-temperature-stage evaporator of the mixed working medium refrigerating machine, and the low-temperature-stage rectifying tower is a plate tower, a packed tower, a flash separator or a fractional condensation separator;
the low-temperature-level evaporator and the low-temperature-level tower top condenser are integrated into a heat exchanger, and the high-temperature-level evaporator and the high-temperature-level tower top condenser are integrated into another heat exchanger.
4. The hybrid refrigeration regenerative oil-gas VOCs condensation recovery system of claim 1, wherein a heavy hydrocarbon separation unit is arranged between the high-temperature separation unit and the oil-gas pressurizing unit, the heavy hydrocarbon separation unit comprises a primary oil-gas cooler, a heavy hydrocarbon separator and a heavy hydrocarbon throttling element, the oil-gas VOCs are cooled in the primary oil-gas cooler and then enter the heavy hydrocarbon separator for separation, the separated gas phase continues to enter the high-temperature oil-gas regenerator, the separated liquid phase heavy hydrocarbon is discharged and recovered after throttling by the heavy hydrocarbon throttling element, and the primary oil-gas cooler is cooled by a water chiller or the hybrid refrigeration unit.
5. The regenerative oil gas VOCs condensation recovery system for mixed working medium refrigeration of claim 1, wherein a pre-cooling cycle is arranged in the mixed working medium refrigerator unit, the high-temperature stage evaporator is arranged at the cold end of the pre-cooling cycle and provides refrigeration capacity for the high-temperature stage hydrocarbon separator, and the low-temperature stage evaporator is arranged at the cold end of the mixed working medium main cycle and provides refrigeration capacity for the low-temperature stage hydrocarbon separator; the pre-cooling circulation adopts a vapor compression refrigeration circulation, an absorption refrigeration circulation, a mixed working medium refrigeration circulation or a commercial water chilling unit.
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