CN215250626U - Multistage condensation oil gas recovery system based on secondary refrigerant - Google Patents
Multistage condensation oil gas recovery system based on secondary refrigerant Download PDFInfo
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- CN215250626U CN215250626U CN202120804813.1U CN202120804813U CN215250626U CN 215250626 U CN215250626 U CN 215250626U CN 202120804813 U CN202120804813 U CN 202120804813U CN 215250626 U CN215250626 U CN 215250626U
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Abstract
The utility model discloses a multistage condensation vapor recovery system based on secondary refrigerant, the operation is stable, the fault rate is low. The utility model discloses a secondary refrigerant-based multistage condensation oil gas recovery system, which comprises an oil gas heat exchanger (7), a primary condensation heat exchanger (8), a secondary condensation section and a tertiary condensation section which are arranged in sequence along the air inlet direction; the primary condensation heat exchanger (8), the secondary condensation section and the tertiary condensation section all use secondary refrigerant as a medium to exchange heat with oil gas to realize oil gas condensation. Preferably, the secondary condensation section comprises a first secondary condensation heat exchanger (12) and a second secondary condensation heat exchanger (20) which are arranged in parallel and can work alternately, and the tertiary condensation section comprises a first tertiary condensation heat exchanger (15) and a second tertiary condensation heat exchanger (16) which are arranged in parallel and can work alternately.
Description
Technical Field
The utility model belongs to the technical field of gas separation equipment, especially a multistage condensation vapor recovery system based on secondary refrigerant of operation stability, energy-conserving efficient.
Background
The oil gas discharged in the processes of storage, transportation, loading and unloading and filling is recovered by methods of adsorption, absorption, condensation or membrane separation and the like, so that the atmospheric pollution caused by the volatilization of the oil gas is prevented, the potential safety hazard is eliminated, the energy utilization is improved, and the energy conservation and environmental protection are realized.
The most widely used oil gas recovery is to adopt a multi-stage direct evaporation and condensation mode for oil gas recovery. For example, the Chinese patent application specification "energy-saving anti-freezing oil gas recovery device" (application number: 201210248807.8, published: 2012.10.24) discloses an oil gas recovery device, which comprises at least two stages of refrigeration systems, wherein each stage of refrigeration system at least comprises an evaporator, an oil gas channel and a refrigerant channel are arranged in the evaporator, the refrigerant exchanges heat with oil gas in the evaporator, the oil gas recovery device also comprises an oil gas heat exchanger, an oil gas channel with a lower outlet at the upper part and an exhaust gas channel with an upper inlet at the lower part are arranged in the oil gas heat exchanger, high-temperature oil gas enters from the lower part, exchanges heat with low-temperature exhaust gas in the oil gas heat exchanger and then is discharged from the upper part, the high-temperature oil gas and the low-temperature exhaust gas sequentially pass through the evaporators of each stage of refrigeration systems to separate out hydrocarbon substances to form low-temperature exhaust gas, the low-temperature exhaust gas enters the oil gas heat exchanger from the upper part, and partial cold energy is discharged from the lower part through the exhaust gas channel.
However, the recovery device adopting the refrigerant to directly evaporate and condense the oil gas generally has the defects that the heat exchange capacity of each stage of evaporator is changed violently due to the great change of the oil gas flow, so that the evaporation temperature fluctuation of the system is great, and the whole machine is unstable in operation and frequent in failure.
Disclosure of Invention
An object of the utility model is to provide a multistage condensation vapor recovery system based on secondary refrigerant, the operation is stable, the fault rate is low.
Realize the utility model discloses the technical solution of purpose does:
a multi-stage condensation oil gas recovery system based on secondary refrigerant comprises an oil gas heat exchanger 7, a primary condensation heat exchanger 8, a secondary condensation section and a tertiary condensation section which are sequentially arranged along the air inlet direction; the primary condensation heat exchanger 8, the secondary condensation section and the tertiary condensation section all use secondary refrigerant as a medium to exchange heat with oil gas to realize oil gas condensation.
Preferably, the secondary condensing stage comprises a first secondary condensing heat exchanger 12 and a second secondary condensing heat exchanger 20 which are arranged in parallel and can be alternately operated, and the tertiary condensing stage comprises a first tertiary condensing heat exchanger 15 and a second tertiary condensing heat exchanger 16 which are arranged in parallel and can be alternately operated.
Compared with the prior art, the utility model, it is showing the advantage and is:
1. the operation is stable, the failure rate is low: the utility model discloses a well low temperature secondary refrigerant is as heat transfer medium between refrigerant and the oil gas, and heat transfer system between secondary refrigerant and the refrigerant is provided with the baffle-box and can stores the secondary refrigerant cold volume to realize secondary refrigerant and oil gas heat transfer system and reach variable flow oil gas regulation, guarantee that vapor recovery condensing system steady operation under the condition of any oil gas flow variation in size.
2. Energy conservation and high efficiency: the secondary refrigerant system is provided with a heat recovery device, a hot refrigerant box is arranged to store heat, the automatic efficient defrosting function of the heat exchanger can be realized by switching the hot refrigerant when the heat exchanger needs defrosting, any energy is not additionally consumed, and the waste heat utilization is energy-saving and efficient.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a structural schematic diagram of the multistage condensation oil-gas recovery system based on the secondary refrigerant.
Fig. 2 is a schematic illustration of the coolant loop configuration of the secondary refrigeration unit of fig. 1.
In the figure, 1-an air inlet valve, 2-a safety valve, 3-an oil gas storage tank, 4-a filter, 5-a fire relief valve, 6-an adsorption device, 7-an air gas heat exchanger, 8-a first-level condensation heat exchanger, 9-a first electric valve, 10-a second three-way valve 11, 11-a first three-way valve 11, 12-a first second-level condensation heat exchanger, 13-a sixth three-way valve 11, 14-a fifth three-way valve 11, 15-a first third-level condensation heat exchanger, 16-a second third-level condensation heat exchanger, 17-a seventh three-way valve 11, 18-an eighth three-way valve 11, 19-a third-level refrigerator set, 20-a second-level condensation heat exchanger, 21-a third three-way valve 11, 22-a fourth three-way valve 11, 23-a second-level refrigerator set and 24-a second electric valve, 25-a first-stage refrigerating unit;
an evaporator 231, a cold coolant tank 232, a cold coolant pump 233, a heat recuperator 234, a hot coolant tank 235, and a hot coolant pump 236.
Detailed Description
As shown in fig. 1, as an embodiment of the present invention, the multi-stage condensation oil gas recovery system based on secondary refrigerant comprises an oil gas heat exchanger 7, a primary condensation heat exchanger 8, a secondary condensation section and a tertiary condensation section, which are sequentially arranged along the oil gas intake direction; the primary condensation heat exchanger 8, the secondary condensation section and the tertiary condensation section all use secondary refrigerant as a medium to exchange heat with oil gas to realize oil gas condensation.
As a conventional arrangement, an air inlet valve 1, an oil gas storage tank 3, a filter 4 and a fire retardant valve 5 which are sequentially arranged along the oil gas inlet direction can be further arranged in front of the oil gas heat exchanger 7. And an adsorption device 6 is also arranged at the tail gas outlet end of the oil-gas heat exchanger 7.
Oil gas gets into oil gas heat exchanger 7 along admission valve 1, oil gas storage tank 3, filter 4 and back-fire relief valve 5, with the tail gas heat transfer that comes from tertiary condensation section, realizes the precooling after, gets into one-level condensation heat exchanger 8 again, through second grade condensation section and tertiary condensation section fractional condensation, becomes liquid with most gaseous state oil condensation, retrieves. The low-temperature tail gas containing a small amount of gaseous oil enters an oil-gas heat exchanger 7, exchanges heat with uncooled high-temperature oil gas, and then is further adsorbed by an adsorption device 6 to enable the tail gas to reach the standard and be discharged.
The first-stage condensation heat exchanger 8, the second-stage condensation section and the third-stage condensation section all use secondary refrigerant as a medium to exchange heat with oil gas to realize oil gas condensation, and most of gaseous oil is condensed into liquid to be recycled. On one hand, the coolant has larger heat capacity and is insensitive to the change of the oil gas quantity entering each condensation section; on the other hand, the refrigerating medium is convenient to adopt various heat storage means to deal with the great change of oil and gas quantity. Therefore, the refrigerating system can be stably operated under the condition that the oil gas quantity greatly fluctuates, and the risk of high failure rate caused by the fluctuating operation of the refrigerating system is greatly reduced.
In order to ensure the uninterrupted operation of the whole oil gas recovery system, as an improvement,
the secondary condensation section comprises a first secondary condensation heat exchanger 12 and a second secondary condensation heat exchanger 20 which are arranged in parallel and can work alternately, and the tertiary condensation section comprises a first tertiary condensation heat exchanger 15 and a second tertiary condensation heat exchanger 16 which are arranged in parallel and can work alternately.
Preferably, as shown in figure 1,
an oil gas inlet of the first third-stage condensation heat exchanger 15 is connected with an oil gas outlet of the first second-stage condensation heat exchanger 12, an oil gas outlet of the first third-stage condensation heat exchanger is connected with a tail gas inlet of the oil gas heat exchanger 7, and an oil gas inlet of the first second-stage condensation heat exchanger 12 is connected with an oil gas outlet of the oil gas heat exchanger 7 through a first electric valve 9;
an oil gas inlet of the second third-stage condensation heat exchanger 16 is connected with an oil gas outlet of the second-stage condensation heat exchanger 20, an oil gas outlet of the second third-stage condensation heat exchanger is also connected with a tail gas inlet of the oil gas heat exchanger 7, and an oil gas inlet of the second-stage condensation heat exchanger 20 is also connected with an oil gas outlet of the oil gas heat exchanger 7 through a second electric valve 24.
From the second-stage condensation section, the condensation temperature is lower and lower, and the heat exchanger is easy to frost. The frost needs to be melted in time according to the thickness of the frost layer on the surface of the heat exchanger so as to ensure good heat exchange effect. For this reason, the utility model discloses at the heat exchanger that second grade, tertiary condensation section all set up side by side, can alternate work, adopt two condensation heat exchangers to realize the switching of oil gas condensation and defrosting function, when guaranteeing the heat exchanger defrosting, oil vapor recovery can incessant continuous operation, improves work efficiency and oil vapor recovery efficiency.
In order to simplify the system, a mode that the third-stage condensing heat exchanger and the second-stage condensing heat exchanger are directly connected in series is adopted.
The first electric valve 9 and the second electric valve 24 are always in opposite working states, namely one is opened and the other is closed, so that the defrosting is carried out on one path while the oil gas is condensed and recovered on the other path.
The secondary refrigerant loops of the first secondary condensing heat exchanger 12 and the second secondary condensing heat exchanger 20 are connected with a secondary refrigerating unit 23;
the secondary refrigerant loops of the first tertiary condensation heat exchanger 15 and the second tertiary condensation heat exchanger 16 are connected with a tertiary refrigerating unit 19;
and the secondary refrigerant loop of the primary condensation heat exchanger 8 is connected with a primary refrigerating unit 25.
Preferably, as shown in figure 2,
the secondary refrigerating unit 23 comprises an evaporator 231, a cold secondary refrigerant box 232 and a cold secondary refrigerant pump 233 which are sequentially arranged along a cold secondary refrigerant pipeline;
the system also comprises a heat recoverer 234, a hot coolant box 235 and a hot coolant pump 236 which are sequentially arranged along the hot coolant pipeline;
the evaporator 231 is connected with the compressor through an air suction pipe, and the heat recoverer 234 is connected with the compressor through an air discharge pipe;
the outlet of the cold carrier pump 233 is communicated with the first secondary condensing heat exchanger 12 through the inlet of the first three-way valve 11, and is communicated with the second secondary condensing heat exchanger 20 through the inlet of the third three-way valve 21;
an inlet of the evaporator 231 is communicated with the first secondary condensing heat exchanger 12 through an outlet of the second three-way valve 10, and is communicated with the second secondary condensing heat exchanger 20 through an outlet of the fourth three-way valve 22;
the outlet of the heat carrier coolant pump 236 is communicated with the first secondary condensing heat exchanger 12 through the inlet of the second three-way valve 10, and is communicated with the second secondary condensing heat exchanger 20 through the inlet of the fourth three-way valve 22;
the inlet of the heat recoverer 234 is communicated with the first secondary condensing heat exchanger 12 through the outlet of the first three-way valve 11, and is communicated with the second secondary condensing heat exchanger 20 through the outlet of the third three-way valve 21.
The three-stage refrigerator group 19 is identical in structure to the two-stage refrigerator group 23. The primary refrigeration unit 25 may be simplified or not use a circuit in which the recuperator is located.
As can be seen from fig. 1, a first three-way valve 11 and a second three-way valve 10 are respectively provided on the coolant circuit of the first secondary condensing heat exchanger 12. Taking the first three-way valve 11 as an example, the port connected with the first secondary condensation heat exchanger 12 is a bidirectional port, the port connected with the secondary condensation secondary refrigerant of the secondary refrigeration unit 23 is a cold-carrying cold inlet, and the port connected with the hot-carrying refrigerant of the secondary refrigeration unit 23 of the first three-way valve 11 is a hot-carrying refrigerant outlet;
correspondingly, the port of the second three-way valve 10 connected with the secondary condensed secondary refrigerant of the secondary refrigerating unit 23 is a cold secondary outlet, and the port connected with the hot carrier refrigerant of the secondary refrigerating unit 23 is a hot carrier refrigerant inlet.
With such an arrangement, the first secondary condensing heat exchanger 12 can be respectively in the oil-gas condensing working state or the defrosting state by correspondingly switching the first three-way valve 11 and the second three-way valve 10, and correspondingly, the second secondary condensing heat exchanger 20 can be respectively in the defrosting state or the oil-gas condensing working state. Thereby ensuring that the oil gas recovery can continuously run while ensuring the defrosting of the heat exchanger.
As shown in fig. 2, a cold coolant tank 232 is provided in the piping between the cold coolant pump 233 and the evaporator 231. When the oil gas quantity is reduced and the required cold quantity is reduced, the cold carrying cold quantity sent to the condensing heat exchanger can be changed to adapt to the change, and redundant cold carrying cold agents can be temporarily stored in the cold carrying cold agent box 232, so that the influence of cold quantity change on the refrigeration compressor is relieved, and the stable operation of the refrigeration compressor is ensured.
The heat recoverer 234 is arranged on the exhaust pipeline of the compressor, hot coolant obtained by high-temperature exhaust is used for defrosting the condensing heat exchanger, and condensing heat of the compressor is recycled, so that on one hand, extra defrosting energy is not needed, on the other hand, the cooling effect of the compressor is improved, the operation efficiency of the compressor is improved, and the energy-saving effect is obvious.
Claims (5)
1. A secondary refrigerant-based multistage condensation oil gas recovery system comprises an oil gas heat exchanger (7), a primary condensation heat exchanger (8), a secondary condensation section and a tertiary condensation section which are sequentially arranged along the air inlet direction; the method is characterized in that:
the primary condensation heat exchanger (8), the secondary condensation section and the tertiary condensation section all use secondary refrigerant as a medium to exchange heat with oil gas to realize oil gas condensation.
2. The multi-stage condensate oil and gas recovery system of claim 1, wherein:
the secondary condensation section comprises a first secondary condensation heat exchanger (12) and a second secondary condensation heat exchanger (20) which are arranged in parallel and can work alternately, and the tertiary condensation section comprises a first tertiary condensation heat exchanger (15) and a second tertiary condensation heat exchanger (16) which are arranged in parallel and can work alternately.
3. The multi-stage condensate oil and gas recovery system of claim 2, wherein:
an oil gas inlet of the first third-stage condensation heat exchanger (15) is connected with an oil gas outlet of the first second-stage condensation heat exchanger (12), an oil gas outlet of the first third-stage condensation heat exchanger is connected with a tail gas inlet of the oil gas heat exchanger (7), and an oil gas inlet of the first second-stage condensation heat exchanger (12) is connected with an oil gas outlet of the oil gas heat exchanger (7) through a first electric valve (9);
an oil gas inlet of the second third-stage condensation heat exchanger (16) is connected with an oil gas outlet of the second-stage condensation heat exchanger (20), an oil gas outlet of the second third-stage condensation heat exchanger is also connected with a tail gas inlet of the oil gas heat exchanger (7), and an oil gas inlet of the second-stage condensation heat exchanger (20) is also connected with an oil gas outlet of the oil gas heat exchanger (7) through a second electric valve (24).
4. The multi-stage condensate oil and gas recovery system of claim 3, wherein:
the secondary refrigerant loops of the first secondary condensing heat exchanger (12) and the second secondary condensing heat exchanger (20) are connected with a secondary refrigerating unit (23);
the secondary refrigerant loops of the first tertiary condensation heat exchanger (15) and the second tertiary condensation heat exchanger (16) are connected with a tertiary refrigerating unit (19);
and a secondary refrigerant loop of the primary condensation heat exchanger (8) is connected with a primary refrigerating unit (25).
5. The multi-stage condensate oil and gas recovery system of claim 4, wherein:
the secondary refrigerating unit (23) comprises an evaporator (231), a cold secondary refrigerant box (232) and a cold secondary refrigerant pump (233) which are sequentially arranged along a cold secondary refrigerant pipeline;
the system also comprises a heat recoverer (234), a hot carrier refrigerant box (235) and a hot carrier refrigerant pump (236) which are sequentially arranged along the hot carrier refrigerant pipeline;
the evaporator (231) is connected with the compressor through the air suction pipe, and the heat recoverer (234) is connected with the compressor through the air exhaust pipe;
the outlet of the cold carrier coolant pump (233) is communicated with the first secondary condensing heat exchanger (12) through the inlet of the first three-way valve (11), and is communicated with the second secondary condensing heat exchanger (20) through the inlet of the third three-way valve (21);
an inlet of the evaporator (231) is communicated with the first secondary condensing heat exchanger (12) through an outlet of a second three-way valve (10), and is communicated with the second secondary condensing heat exchanger (20) through an outlet of a fourth three-way valve (22);
the outlet of the heat carrier refrigerant pump (236) is communicated with the first secondary condensing heat exchanger (12) through the inlet of a second three-way valve (10) and is communicated with the second secondary condensing heat exchanger (20) through the inlet of a fourth three-way valve (22);
an inlet of the heat recoverer (234) is communicated with the first secondary condensation heat exchanger (12) through an outlet of a first three-way valve (11), and is communicated with the second secondary condensation heat exchanger (20) through an outlet of a third three-way valve (21).
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| CN202120804813.1U CN215250626U (en) | 2021-04-20 | 2021-04-20 | Multistage condensation oil gas recovery system based on secondary refrigerant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115501637A (en) * | 2022-10-21 | 2022-12-23 | 深圳市德捷力低温技术有限公司 | VOC condensation recovery system and corresponding VOC condensation recovery method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115501637A (en) * | 2022-10-21 | 2022-12-23 | 深圳市德捷力低温技术有限公司 | VOC condensation recovery system and corresponding VOC condensation recovery method |
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Address after: 211500 No. 8, Longzhong West Road, Longchi street, Liuhe Economic Development Zone, Nanjing, Jiangsu Patentee after: Nanjing Jiuding Environmental Technology Co.,Ltd. Address before: 210000 No.8, Longzhong West Road, Longchi street, Liuhe District, Nanjing City, Jiangsu Province Patentee before: NANJING JIUDING REFRIGERATION & AIR-CONDITIONING EQUIPMENT CO.,LTD. |