CN110345707B - Multistage condensation system and multistage condensation method for oil gas recovery - Google Patents
Multistage condensation system and multistage condensation method for oil gas recovery Download PDFInfo
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- 238000009833 condensation Methods 0.000 title claims abstract description 90
- 230000005494 condensation Effects 0.000 title claims abstract description 90
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003507 refrigerant Substances 0.000 claims abstract description 103
- 239000007788 liquid Substances 0.000 claims description 160
- 239000000203 mixture Substances 0.000 claims description 35
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical group CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 12
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical group CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000001294 propane Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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Abstract
The invention discloses a multi-stage condensation system for oil gas recovery, which comprises a first-stage condensation unit and a second-stage condensation unit which are circulated with a first refrigerant, and a third-stage condensation unit which is circulated with a second refrigerant. According to the multistage condensation system for oil gas recovery, the refrigeration efficiency can be ensured on the premise of reducing the complexity of the system and the using number of compressors by the mutual matching of the primary condensation unit, the secondary condensation unit and the tertiary condensation unit, and the system is simple in structure and convenient to operate; the multistage condensation method based on the multistage condensation system is simple in steps and convenient to operate, and can efficiently condense and recover oil gas.
Description
Technical Field
The invention relates to the field of oil gas recovery, in particular to a multistage condensation system and a multistage condensation method for oil gas recovery.
Background
With the enhancement of the awareness of environmental protection and energy conservation of people, the oil gas recovery problem is paid more and more attention, and on one hand, the oil gas recovery can reduce the emission of oil gas to the atmosphere and reduce the pollution to the environment; on the other hand, the recovered oil gas can be continuously put into use after being treated, so that the cost is saved, and the value is created. In the special oil gas recovery equipment, the oil gas recovery device adopting the condensation method is most widely applied and has the most mature technology, and the oil gas is mainly condensed and recovered by adopting multi-stage cooling in the current market.
To general oil gas, can retrieve for liquid with the condensation of most oil gas after carrying out tertiary cooling, adopt tertiary cooling just need correspond high, well, low tertiary refrigeration temperature. In the prior art, a high-temperature refrigerating unit is provided with an independent refrigerating unit, and the unit adopts a single compressor for refrigeration; for a medium-temperature refrigerating unit, in order to improve the refrigerating efficiency, two compressors are configured for high-low pressure matching; for the low-temperature refrigerating system, a cascade refrigerating unit is adopted, and the high-temperature refrigerating unit only has the function of condensing the low-temperature refrigerant. The three-stage condensation oil gas recovery system at least needs 5 to 7 compressors to operate simultaneously, is high in cost, needs a plurality of matched components and is complex in structure.
Disclosure of Invention
An object of the present invention is to overcome the disadvantages of the prior art and to provide a multi-stage condensing system for oil gas recovery, which reduces the number of compressors used, saves costs, and ensures refrigeration efficiency; and the system has simple structure and convenient operation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-stage condensing system for oil gas recovery comprises a first-stage condensing unit and a second-stage condensing unit which are circulated with a first refrigerant, and a third-stage condensing unit which is circulated with a second refrigerant,
the primary condensation unit comprises a first compressor, a second compressor, a first heat exchanger, a first throttling valve and a second heat exchanger which are sequentially communicated, the first heat exchanger is provided with a first heat exchange channel I and a first heat exchange channel II, the second heat exchanger is provided with a second heat exchange channel I and a second heat exchange channel II, two ends of the first heat exchange channel I are respectively communicated with an air outlet of the second compressor and the first throttling valve, and two ends of the second heat exchange channel I are respectively communicated with the first throttling valve and an air inlet of the second compressor;
the secondary condensation unit comprises a third heat exchanger, a second throttling valve, a first gas-liquid separator and a fourth heat exchanger which are sequentially communicated, the third heat exchanger is provided with a third heat exchange channel I and a third heat exchange channel II, the fourth heat exchanger is provided with a fourth heat exchange channel I and a fourth heat exchange channel II, two ends of the third heat exchange channel I are respectively communicated with one end, far away from the second compressor, of the first heat exchange channel I and the second throttling valve, two ends of the fourth heat exchange channel I are respectively communicated with an inlet and a liquid outlet of the first gas-liquid separator, and a gas outlet of the first gas-liquid separator is communicated with a gas inlet of the first compressor;
the third-stage condensation unit comprises a fifth heat exchanger, a third throttle valve, a second gas-liquid separator and a sixth heat exchanger which are sequentially communicated, the fifth heat exchanger is provided with a fifth heat exchange channel I and a fifth heat exchange channel II, the sixth heat exchanger is provided with a sixth heat exchange channel I and a sixth heat exchange channel II, and two ends of the sixth heat exchange channel I are respectively communicated with an inlet and a liquid outlet of the second gas-liquid separator;
the multistage condensation system further comprises a third compressor, a seventh heat exchanger and a fourth throttling valve, wherein the third compressor and the seventh heat exchanger are sequentially communicated, the fourth throttling valve is communicated with one end, far away from the first heat exchange channel I, of the third heat exchange channel I, the seventh heat exchanger is provided with a seventh heat exchange channel I and a seventh heat exchange channel II, two ends of the fifth heat exchange channel I are respectively communicated with a gas outlet of the second gas-liquid separator and a gas inlet of the third compressor, two ends of the fifth heat exchange channel II are respectively communicated with one end, far away from the third compressor, of the seventh heat exchange channel I and the third throttling valve, the other end of the seventh heat exchange channel I is communicated with a gas outlet of the third compressor, and two ends of the seventh heat exchange channel II are respectively communicated with the fourth throttling valve and a gas inlet of the first compressor;
the oil gas sequentially passes through the second heat exchange channel II, the fourth heat exchange channel II and the sixth heat exchange channel II to complete heat exchange with the first refrigerant and the second refrigerant.
Preferably, the multistage condensation system further comprises a fifth throttling valve communicated with one end of the first heat exchange channel I, which is far away from the second compressor, and two ends of the third heat exchange channel II are respectively communicated with the fifth throttling valve and the air inlet of the second compressor.
Preferably, cooling water is arranged in the first heat exchange channel II for exchanging heat with the first refrigerant in the first heat exchange channel I.
Preferably, there are two fourth heat exchangers, and the two fourth heat exchangers are arranged in parallel.
Preferably, there are two sixth heat exchangers, and the two sixth heat exchangers are arranged in parallel.
The invention also aims to provide a multistage condensation method for oil gas recovery, which is realized based on the multistage condensation system, has simple steps and convenient operation, and can efficiently condense and recover oil gas.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-stage condensation method for oil and gas recovery is based on the multi-stage condensation system, and comprises the following steps:
(1) the method comprises the steps that low-temperature low-pressure first refrigerant gas is sequentially sent to a first compressor and a second compressor to obtain high-temperature high-pressure first refrigerant gas, then the high-temperature high-pressure first refrigerant gas is sent to a first heat exchange channel I, and heat exchange is carried out between the high-temperature high-pressure first refrigerant gas and cooling water in a first heat exchange channel II to obtain first refrigerant liquid;
(2) dividing the first refrigerant liquid into liquid a, liquid b and liquid c, sending the liquid a into a first throttling valve to obtain a medium-temperature and medium-pressure gas-liquid mixture a, sending the medium-temperature and medium-pressure gas-liquid mixture a into a second heat exchange channel I, sending oil gas into a second heat exchange channel II at the moment, exchanging heat with the gas-liquid mixture a to realize primary condensation of the oil gas, and then collecting oil liquid after the primary condensation, wherein the gas-liquid mixture a absorbs heat and is changed into medium-temperature and medium-pressure gas a;
(3) sending the liquid b into a third heat exchange channel II, sending the liquid c into a fifth throttling valve to obtain a medium-temperature and medium-pressure gas-liquid mixture c, sending the medium-temperature and medium-pressure gas-liquid mixture c into a third heat exchange channel I, and then exchanging heat with the liquid b in the third heat exchange channel II, so that the gas-liquid mixture c absorbs heat and is changed into medium-temperature and medium-pressure gas c;
(4) mixing the gas a obtained in the step (2) and the gas c obtained in the step (3) with the first refrigerant gas compressed by the first compressor in the step (1), and then sending the mixture into a second compressor again;
(5) dividing the liquid b subjected to heat exchange in the step (3) into liquid b1 and liquid b2, sequentially feeding the liquid b1 into a second throttling valve and a first gas-liquid separator to obtain pure liquid b1 and pure gas b1, feeding the pure liquid b1 into a fourth heat exchange channel I, feeding the oil gas subjected to primary condensation in the step (2) into a fourth heat exchange channel II, performing heat exchange with the pure liquid b1 to realize secondary condensation of the oil gas, collecting oil liquid subjected to secondary condensation, absorbing heat by the pure liquid b1, changing the oil liquid into a low-temperature low-pressure gas-liquid mixture b1, and feeding the oil liquid into the first gas-liquid separator again;
(6) sending the liquid b2 into a seventh heat exchange channel II, sending the second refrigerant gas with low temperature and low pressure into a third compressor to obtain the second refrigerant gas with high temperature and high pressure, then sending the second refrigerant gas with high temperature and high pressure into a seventh heat exchange channel I, and exchanging heat with the liquid b2, wherein the second refrigerant gas with high temperature and high pressure is condensed into the second refrigerant liquid with high pressure, and the liquid b2 absorbs heat and is changed into the gas b2 with low temperature and low pressure;
(7) mixing the pure gas b1 in the step (5) and the gas b2 in the step (6) with the first refrigerant gas with low temperature and low pressure, and sending the mixture into the first compressor again;
(8) sending the high-pressure second refrigerant liquid obtained in the step (6) into a fifth heat exchange channel I, a third throttling valve and a second gas-liquid separator in sequence to obtain pure second refrigerant liquid and pure second refrigerant gas, sending the pure second refrigerant liquid into a sixth heat exchange channel I, sending the oil gas obtained in the step (5) after secondary condensation into a sixth heat exchange channel II, exchanging heat with the pure second refrigerant liquid to realize tertiary condensation of the oil gas, then collecting oil liquid obtained after tertiary condensation, and changing the pure second refrigerant liquid obtained after heat exchange into a low-temperature and low-pressure second refrigerant gas-liquid mixture and sending the mixture into the second gas-liquid separator again;
(9) and (4) sending the pure second refrigerant gas obtained in the step (8) into a fifth heat exchange channel II, exchanging heat with high-pressure second refrigerant liquid in the fifth heat exchange channel I, enabling the second refrigerant gas after heat exchange to enter a third compressor, and enabling the high-pressure second refrigerant liquid to enter a third throttling valve again after being cooled.
Preferably, the first refrigerant is propane and the second refrigerant is ethane.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the multistage condensation system for oil gas recovery, the refrigeration efficiency can be ensured on the premise of reducing the complexity of the system and the using number of compressors by the mutual matching of the primary condensation unit, the secondary condensation unit and the tertiary condensation unit, and the system is simple in structure and convenient to operate; the multistage condensation method based on the multistage condensation system is simple in steps and convenient to operate, and can efficiently condense and recover oil gas.
Drawings
FIG. 1 is a schematic diagram of a multi-stage condensing system in an embodiment of the present invention.
Wherein: 1. a first compressor; 2. a second compressor; 3. a first heat exchanger; 3a, a first heat exchange channel I; 3b, a first heat exchange channel II; 4. a first throttle valve; 5. a second heat exchanger; 5a, a second heat exchange channel I; 5b, a second heat exchange channel II; 6. a third heat exchanger; 6a, a third heat exchange channel I; 6b, a third heat exchange channel II; 7. a second throttle valve; 8. a first gas-liquid separator; 9. a fourth heat exchanger; 9a, a fourth heat exchange channel I; 9b, a fourth heat exchange channel II; 10. a fifth heat exchanger; 10a, a fifth heat exchange channel I; 10b, a fifth heat exchange channel II; 11. a third throttle valve; 12. a second gas-liquid separator; 13. a sixth heat exchanger; 13a and a sixth heat exchange channel I; 13b, a sixth heat exchange channel II; 14. a third compressor; 15. a seventh heat exchanger; 15a and a seventh heat exchange channel I; 15b, a seventh heat exchange channel II; 16. a fourth throttle valve; 17. and a fifth throttle valve.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1, a multi-stage condensing system for oil and gas recovery includes a first stage condensing unit and a second stage condensing unit circulating first refrigerants, and a third stage condensing unit circulating second refrigerants. Here, through mutually supporting of one-level condensation unit, second grade condensation unit and tertiary condensation unit, can guarantee refrigeration efficiency under the prerequisite that reduces system complexity and compressor use quantity, and this system simple structure, convenient operation. The first refrigerant is propane, the second refrigerant is ethane, the propane and the ethane are selected according to respective physical properties and are more suitable for multi-stage condensation, and compared with Freon in the prior art, the propane and the ethane in the embodiment are raw materials in a production process in a chemical plant, are easier to obtain and do not need to be purchased additionally.
The first-stage condensation unit comprises a first compressor 1, a second compressor 2, a first heat exchanger 3, a first throttling valve 4 and a second heat exchanger 5 which are sequentially communicated, the first heat exchanger 3 is provided with a first heat exchange channel I3a and a first heat exchange channel II3b, the second heat exchanger 5 is provided with a second heat exchange channel I5a and a second heat exchange channel II5b, two ends of the first heat exchange channel I3a are respectively communicated with a gas outlet of the second compressor 2 and the first throttling valve 4, and two ends of the second heat exchange channel I5a are respectively communicated with gas inlets of the first throttling valve 4 and the second compressor 2. Here, cooling water is arranged in the first heat exchange channel II3b and used for exchanging heat with the first refrigerant in the first heat exchange channel I3a, and the oil gas exchanges heat with the first refrigerant after being cooled in the second heat exchange channel II5b in the second heat exchange channel I5a to realize primary condensation, and the condensation temperature is 2 ℃. Here, the first heat exchange channel I3a and the first heat exchange channel II3b are respectively a tube side and a shell side of the first heat exchanger 3, and the second heat exchange channel I5a and the second heat exchange channel II5b are respectively a tube side and a shell side of the second heat exchanger 5.
In this embodiment, the first compressor 1 and the second compressor 2 are both oil-injection screw compressors, the compression ratio of the first compressor 1 is smaller than that of the second compressor 2, the first heat exchanger 3 is a water-cooled condenser, the second heat exchanger 5 is a thermosiphon heat exchanger, and compared with existing dry and flooded heat exchangers, the thermosiphon heat exchanger has the advantages that the heat exchange effect is remarkably increased, and the heat exchange area is reduced.
The second-stage condensation unit comprises a third heat exchanger 6, a second throttling valve 7, a first gas-liquid separator 8 and a fourth heat exchanger 9 which are sequentially communicated, the third heat exchanger 6 is provided with a third heat exchange channel I6a and a third heat exchange channel II6b, the fourth heat exchanger 9 is provided with a fourth heat exchange channel I9a and a fourth heat exchange channel II9b, two ends of the third heat exchange channel I6a are respectively communicated with one end, away from the second compressor 2, of the first heat exchange channel I3a and the second throttling valve 7, two ends of the fourth heat exchange channel I9a are respectively communicated with an inlet and a liquid outlet of the first gas-liquid separator 8, and a gas outlet of the first gas-liquid separator 8 is communicated with a gas inlet of the first compressor 1. Here, the oil gas after the primary condensation exchanges heat with the first refrigerant in the fourth heat exchange channel I9a in the fourth heat exchange channel II9b to realize secondary condensation, and the condensation temperature is-30 ℃. Here, the third heat exchange channel I6a and the third heat exchange channel II6b are respectively the shell side and the tube side of the third heat exchanger 6, and the fourth heat exchange channel I9a and the fourth heat exchange channel II9b are respectively the tube side and the shell side of the fourth heat exchanger 9.
The multistage condensation system further comprises a fifth throttling valve 17 communicated with one end, far away from the second compressor 2, of the first heat exchange channel I3a, and two ends of a third heat exchange channel II6b are respectively communicated with the fifth throttling valve 17 and an air inlet of the second compressor 2.
In this embodiment, the third heat exchanger 6 is a cooler and the fourth heat exchanger 9 is a thermosiphon heat exchanger.
In this embodiment, there are two fourth heat exchangers 9, and the two fourth heat exchangers 9 are arranged in parallel. One of the two fourth heat exchangers 9 arranged in parallel is normally used by the system, and the other one is standby, so that the standby heat exchanger can be immediately replaced after one heat exchanger fails in a low-temperature environment, and the operation of the system is not influenced.
The three-stage condensation unit comprises a fifth heat exchanger 10, a third throttle valve 11, a second gas-liquid separator 12 and a sixth heat exchanger 13 which are sequentially communicated, the fifth heat exchanger 10 is provided with a fifth heat exchange channel I10a and a fifth heat exchange channel II10b, the sixth heat exchanger 13 is provided with a sixth heat exchange channel I13a and a sixth heat exchange channel II13b, and two ends of the sixth heat exchange channel I13a are respectively communicated with an inlet and a liquid outlet of the second gas-liquid separator 12. Here, the oil gas exchanges heat with the second refrigerant in the sixth heat exchange channel I13a in the sixth heat exchange channel II13b to realize three-stage condensation, and the condensation temperature is-75 ℃. Here, the fifth heat exchange channel I10a and the fifth heat exchange channel II10b are the shell side and the tube side of the fifth heat exchanger 10, and the sixth heat exchange channel I13a and the sixth heat exchange channel II13b are the tube side and the shell side of the sixth heat exchanger 13, respectively.
In the present embodiment, the fifth heat exchanger 10 is a regenerator, and the sixth heat exchanger 13 is a thermosiphon heat exchanger.
In this embodiment, there are two sixth heat exchangers 13, and the two sixth heat exchangers 13 are arranged in parallel. One of the two sixth heat exchangers 13 arranged in parallel is normally used by the system, and the other one is standby, so that the standby heat exchanger can be immediately replaced after one heat exchanger fails in a low-temperature environment, and the operation of the system is not influenced.
The multistage condensation system further comprises a third compressor 14 and a seventh heat exchanger 15 which are communicated in sequence, and a fourth throttling valve 16 communicated with one end, far away from the first heat exchange channel I3a, of a third heat exchange channel I6a, the seventh heat exchanger 15 is provided with a seventh heat exchange channel I15a and a seventh heat exchange channel II15b, two ends of a fifth heat exchange channel I10a are communicated with a gas outlet of the second gas-liquid separator 12 and an air inlet of the third compressor 14 respectively, two ends of a fifth heat exchange channel II10b are communicated with one end, far away from the third compressor 14, of a seventh heat exchange channel I15a and the third throttling valve 11 respectively, the other end of the seventh heat exchange channel I15a is communicated with an air outlet of the third compressor 14, and two ends of the seventh heat exchange channel II15b are communicated with the fourth throttling valve 16 and the air inlet of the first compressor 1 respectively. Here, the seventh heat exchange channel I15a and the seventh heat exchange channel II15b are the tube side and the shell side of the seventh heat exchanger 15, respectively. Through the arrangement of the seventh heat exchanger 15, the heat exchange of the first refrigerant and the second refrigerant is realized, so that the first-stage condensation unit and the second-stage condensation unit can be combined with the third-stage condensation unit, the use of a compressor is reduced, and the complexity of the system is reduced.
In the present embodiment, the seventh heat exchanger 15 is an evaporative condenser.
Here, the oil gas passes through the second heat exchange passage II5b, the fourth heat exchange passage II9b and the sixth heat exchange passage II13b in sequence, completes heat exchange with the first refrigerant and the second refrigerant, and is condensed into oil liquid to be collected in sequence.
In this embodiment, each part of the multistage condensation system is communicated with each other through a pipeline, a branch pipe is used when the same part is communicated with two other parts at the same time, and a plurality of pipelines are connected through a tee joint. The whole system is driven by only three compressors, so that the complexity of the system is greatly reduced, and the cost is saved.
A multi-stage condensation method for oil gas recovery based on the multi-stage condensation system comprises the following steps:
1) the method comprises the following steps of sequentially feeding low-temperature and low-pressure first refrigerant gas into a first compressor 1 and a second compressor 2 to obtain high-temperature and high-pressure first refrigerant gas, then feeding the high-temperature and high-pressure first refrigerant gas into a first heat exchange channel I3a, and performing heat exchange with cooling water in a first heat exchange channel II3b to obtain first refrigerant liquid;
2) dividing the first refrigerant liquid into liquid a, liquid b and liquid c, sending the liquid a into the first throttle valve 4 to obtain a medium-temperature and medium-pressure gas-liquid mixture a, sending the medium-temperature and medium-pressure gas-liquid mixture a into the second heat exchange channel I5a, sending oil gas into the second heat exchange channel II5b at the moment, exchanging heat with the gas-liquid mixture a, and realizing first-stage condensation of the oil gas, wherein the gas-liquid mixture a absorbs heat and is changed into medium-temperature and medium-pressure gas a;
3) sending the liquid b into a third heat exchange channel II6b, sending the liquid c into a fifth throttling valve 17 to obtain a medium-temperature and medium-pressure gas-liquid mixture c, sending the medium-temperature and medium-pressure gas-liquid mixture c into a third heat exchange channel I6a, and then exchanging heat with the liquid b in a third heat exchange channel II6b, so that the gas-liquid mixture c absorbs heat and is changed into medium-temperature and medium-pressure gas c;
4) mixing the gas a obtained in the step 2) and the gas c obtained in the step 3) with the first refrigerant gas compressed by the first compressor 1 in the step 1), and then sending the mixture into the second compressor 2 again;
5) dividing the liquid b subjected to heat exchange in the step 3) into liquid b1 and liquid b2, sequentially feeding the liquid b1 into a second throttling valve 7 and a first gas-liquid separator 8 to obtain pure liquid b1 and pure gas b1, feeding the pure liquid b1 into a fourth heat exchange channel I9a, feeding the oil gas subjected to primary condensation in the step 2) into a fourth heat exchange channel II9b, performing heat exchange with the pure liquid b1 to realize secondary condensation of the oil gas, and feeding the pure liquid b1 into the first gas-liquid separator 8 after absorbing heat and changing into a low-temperature and low-pressure gas-liquid mixture b 1;
6) sending the liquid b2 into a seventh heat exchange channel II15b, sending the second refrigerant gas with low temperature and low pressure into a third compressor 14 to obtain the second refrigerant gas with high temperature and high pressure, then sending the second refrigerant gas with high temperature and high pressure into a seventh heat exchange channel I15a, exchanging heat with the liquid b2, condensing the second refrigerant gas with high temperature and high pressure into the second refrigerant liquid with high pressure, and absorbing heat by the liquid b2 to become the gas b2 with low temperature and low pressure;
7) mixing the pure gas b1 in the step 5) and the gas b2 in the step 6) with the first refrigerant gas with low temperature and low pressure, and then sending the mixture into the first compressor 1 again;
8) the high-pressure second refrigerant liquid in the step 6) is sequentially sent into a fifth heat exchange channel I10a, a third throttle valve 11 and a second gas-liquid separator 12 to obtain pure second refrigerant liquid and pure second refrigerant gas, the pure second refrigerant liquid is sent into a sixth heat exchange channel I13a, at the moment, oil gas subjected to secondary condensation in the step 5) is sent into a sixth heat exchange channel II13b and exchanges heat with the pure second refrigerant liquid to realize tertiary condensation of the oil gas, and the pure second refrigerant liquid subjected to heat exchange becomes a low-temperature low-pressure second refrigerant gas-liquid mixture and is sent into the second gas-liquid separator 12 again;
9) and (3) feeding the pure second refrigerant gas obtained in the step 8) into a fifth heat exchange channel II10b, exchanging heat with the high-pressure second refrigerant liquid in a fifth heat exchange channel I10a, feeding the second refrigerant gas after heat exchange into a third compressor 14, and feeding the high-pressure second refrigerant liquid into a third throttle valve 11 again after cooling.
Wherein the first refrigerant is propane and the second refrigerant is ethane.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A multistage condensing system for vapor recovery system, its characterized in that: the multistage condensation system comprises a first-stage condensation unit and a second-stage condensation unit which are circulated with a first refrigerant, and a third-stage condensation unit which is circulated with a second refrigerant,
the primary condensation unit comprises a first compressor (1), a second compressor (2), a first heat exchanger (3), a first throttling valve (4) and a second heat exchanger (5) which are sequentially communicated, the first heat exchanger (3) is provided with a first heat exchange channel I (3a) and a first heat exchange channel II (3b), the second heat exchanger (5) is provided with a second heat exchange channel I (5a) and a second heat exchange channel II (5b), two ends of the first heat exchange channel I (3a) are respectively communicated with a gas outlet of the second compressor (2) and the first throttling valve (4), and two ends of the second heat exchange channel I (5a) are respectively communicated with a gas inlet of the first throttling valve (4) and a gas inlet of the second compressor (2);
the secondary condensation unit comprises a third heat exchanger (6), a second throttling valve (7), a first gas-liquid separator (8) and a fourth heat exchanger (9) which are communicated in sequence, the third heat exchanger (6) is provided with a third heat exchange channel I (6a) and a third heat exchange channel II (6b), the fourth heat exchanger (9) is provided with a fourth heat exchange channel I (9a) and a fourth heat exchange channel II (9b), two ends of the third heat exchange channel I (6a) are respectively communicated with one end of the first heat exchange channel I (3a) far away from the second compressor (2) and the second throttling valve (7), two ends of the fourth heat exchange channel I (9a) are respectively communicated with an inlet and a liquid outlet of the first gas-liquid separator (8), the gas outlet of the first gas-liquid separator (8) is communicated with the gas inlet of the first compressor (1);
two fourth heat exchangers (9) are arranged, and the two fourth heat exchangers (9) are arranged in parallel;
the three-stage condensation unit comprises a fifth heat exchanger (10), a third throttle valve (11), a second gas-liquid separator (12) and a sixth heat exchanger (13) which are sequentially communicated, the fifth heat exchanger (10) is provided with a fifth heat exchange channel I (10a) and a fifth heat exchange channel II (10b), the sixth heat exchanger (13) is provided with a sixth heat exchange channel I (13a) and a sixth heat exchange channel II (13b), and two ends of the sixth heat exchange channel I (13a) are respectively communicated with an inlet and a liquid outlet of the second gas-liquid separator (12);
two sixth heat exchangers (13) are arranged, and the two sixth heat exchangers (13) are arranged in parallel;
the multistage condensation system further comprises a third compressor (14) and a seventh heat exchanger (15) which are communicated in sequence, and a fourth throttling valve (16) communicated with one end, far away from the first heat exchange channel I (3a), of the third heat exchange channel I (6a), the seventh heat exchanger (15) is provided with a seventh heat exchange channel I (15a) and a seventh heat exchange channel II (15b), two ends of the fifth heat exchange channel I (10a) are respectively communicated with a gas outlet of the second gas-liquid separator (12) and a gas inlet of the third compressor (14), two ends of the fifth heat exchange channel II (10b) are respectively communicated with one end, far away from the third compressor (14), of the seventh heat exchange channel I (15a) and the third throttling valve (11), and the other end of the seventh heat exchange channel I (15a) is communicated with a gas outlet of the third compressor (14), two ends of the seventh heat exchange channel II (15b) are respectively communicated with the fourth throttling valve (16) and an air inlet of the first compressor (1);
the oil gas sequentially passes through the second heat exchange channel II (5b), the fourth heat exchange channel II (9b) and the sixth heat exchange channel II (13b) to complete heat exchange with the first refrigerant and the second refrigerant.
2. The multi-stage condensing system for oil and gas recovery of claim 1, characterized by: the multistage condensation system further comprises a fifth throttling valve (17) communicated with one end, far away from the second compressor (2), of the first heat exchange channel I (3a), and two ends of the third heat exchange channel II (6b) are communicated with the fifth throttling valve (17) and an air inlet of the second compressor (2) respectively.
3. The multi-stage condensing system for oil and gas recovery of claim 1, characterized by: and cooling water is arranged in the first heat exchange channel II (3b) and is used for exchanging heat with the first refrigerant in the first heat exchange channel I (3 a).
4. A multistage condensation method for oil and gas recovery based on the multistage condensation system of any one of claims 1 to 3, characterized in that: the multistage condensation process comprises the steps of:
1) the method comprises the steps that low-temperature low-pressure first refrigerant gas is sequentially sent to a first compressor (1) and a second compressor (2) to obtain high-temperature high-pressure first refrigerant gas, then the high-temperature high-pressure first refrigerant gas is sent to a first heat exchange channel I (3a), and heat exchange is carried out between the high-temperature high-pressure first refrigerant gas and cooling water in a first heat exchange channel II (3b) to obtain first refrigerant liquid;
2) dividing the first refrigerant liquid into liquid a, liquid b and liquid c, sending the liquid a into a first throttling valve (4) to obtain a medium-temperature and medium-pressure gas-liquid mixture a, sending the medium-temperature and medium-pressure gas-liquid mixture a into a second heat exchange channel I (5a), sending oil gas into a second heat exchange channel II (5b) at the moment, exchanging heat with the gas-liquid mixture a to realize primary condensation of the oil gas, and then collecting oil liquid of the primary condensation, wherein the gas-liquid mixture a absorbs heat and is changed into medium-temperature and medium-pressure gas a;
3) sending the liquid b into a third heat exchange channel II (6b), sending the liquid c into a fifth throttling valve (17) to obtain a medium-temperature and medium-pressure gas-liquid mixture c, sending the medium-temperature and medium-pressure gas-liquid mixture c into a third heat exchange channel I (6a), and then exchanging heat with the liquid b in the third heat exchange channel II (6b), wherein the gas-liquid mixture c absorbs heat and is changed into medium-temperature and medium-pressure gas c;
4) mixing the gas a obtained in the step 2) and the gas c obtained in the step 3) with the first refrigerant gas compressed by the first compressor (1) in the step 1), and then sending the mixture into the second compressor (2) again;
5) dividing the liquid b subjected to heat exchange in the step 3) into liquid b1 and liquid b2, sequentially feeding the liquid b1 into a second throttling valve (7) and a first gas-liquid separator (8) to obtain pure liquid b1 and pure gas b1, feeding the pure liquid b1 into a fourth heat exchange channel I (9a), feeding the oil gas subjected to primary condensation in the step 2) into a fourth heat exchange channel II (9b), performing heat exchange with the pure liquid b1 to realize secondary condensation of the oil gas, collecting oil liquid subjected to secondary condensation, and feeding the pure liquid b1 subjected to heat absorption to obtain a low-temperature and low-pressure gas-liquid mixture b1 into the first gas-liquid separator (8);
6) feeding the liquid b2 into a seventh heat exchange channel II (15b), feeding the second refrigerant gas with low temperature and low pressure into a third compressor (14) to obtain the second refrigerant gas with high temperature and high pressure, then feeding the second refrigerant gas with high temperature and high pressure into a seventh heat exchange channel I (15a) and exchanging heat with the liquid b2, condensing the second refrigerant gas with high temperature and high pressure into the second refrigerant liquid with high pressure, and absorbing heat of the liquid b2 to obtain the gas b2 with low temperature and low pressure;
7) mixing the pure gas b1 in the step 5) and the gas b2 in the step 6) with the first refrigerant gas with low temperature and low pressure, and sending the mixture into the first compressor (1) again;
8) sending the high-pressure second refrigerant liquid obtained in the step 6) into a fifth heat exchange channel I (10a), a third throttle valve (11) and a second gas-liquid separator (12) in sequence to obtain pure second refrigerant liquid and pure second refrigerant gas, sending the pure second refrigerant liquid into a sixth heat exchange channel I (13a), sending the oil gas obtained after the secondary condensation in the step 5) into a sixth heat exchange channel II (13b), exchanging heat with the pure second refrigerant liquid to realize the tertiary condensation of the oil gas, then collecting oil liquid obtained after the tertiary condensation, and changing the pure second refrigerant liquid obtained after the heat exchange into a low-temperature low-pressure second refrigerant gas-liquid mixture and sending the second refrigerant gas-liquid mixture into the second gas-liquid separator (12) again;
9) and (3) feeding the pure second refrigerant gas obtained in the step (8) into a fifth heat exchange channel II (10b), exchanging heat with high-pressure second refrigerant liquid in a fifth heat exchange channel I (10a), feeding the second refrigerant gas after heat exchange into a third compressor (14), and feeding the high-pressure second refrigerant liquid into a third throttle valve (11) again after temperature reduction.
5. The multi-stage condensation method for oil and gas recovery according to claim 4, characterized in that: the first refrigerant is propane and the second refrigerant is ethane.
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