Tertiary oil gas recovery equipment

Abstract

The utility model discloses tertiary oil gas recovery equipment which comprises a compressor, a condenser, a gas-liquid separator, a liquid discharge pipeline and an exhaust pipeline. The input end of the compressor communicates with the oil storage tank. The input end of the condenser communicates with the output end of the compressor. The gas-liquid separator comprises a liquid inlet, a liquid outlet and an exhaust port, and the liquid inlet is communicated with the output end of the condenser. The liquid discharge pipeline is communicated with the liquid discharge port and the oil storage tank. The exhaust pipeline communicates with the exhaust port and the oil storage tank. According to the tertiary oil gas recovery equipment in the embodiment of the utility model, the exhaust pipeline of the gas-liquid separator is communicated with the oil storage tank, so that uncondensed oil gas can be conveyed into the oil storage tank again for cyclic compression and condensation, the oil gas is prevented from being discharged into the air, and the pollution of the oil gas to the air is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas recovery, and in particular relates to tertiary oil and gas recovery equipment. Background Art

[0002] At present, the oil and gas recovery at gas stations includes primary recovery, secondary recovery and tertiary recovery. The primary recovery is when the oil tanker is unloading oil, and the oil and gas volatilized during the unloading process is collected into the tanker through the return air pipe on the tanker. Secondary recovery is when the car is refueled, and the oil and gas volatilized in the car tank is pumped into the oil storage tank of the gas station through the vacuum pump installed inside the gas pump. Tertiary recovery is when the gas station is storing gasoline, and the oil and gas in the gas station oil storage tank is directly condensed into liquid oil through the tertiary oil and gas recovery equipment to achieve the purpose of recycling. Since a large amount of gasoline is stored in the oil storage tank of the gas station, the oil and gas generated by the internal volatilization is relatively large, so tertiary oil and gas recovery is particularly important.

[0003] The current tertiary oil and gas recovery equipment generally condenses oil and gas into liquid oil by condensation, separates the liquid oil from the uncondensed oil and gas by a gas-liquid separator, and then re-inputs the liquid oil into the oil storage tank, and performs membrane separation on the uncondensed oil and gas, separates the gaseous oil from the impurity gas inside the uncondensed oil and gas, and discharges the impurity gas into the air. However, the recovery rate of the gaseous oil obtained after membrane separation is low, and the polymer membrane required for membrane separation needs to be frequently replaced, resulting in frequent shutdown of the equipment, which is extremely inconvenient. In addition, once the polymer membrane fails and is not replaced in time, the concentration of gaseous oil in the discharged impurity gas will increase significantly, polluting the surrounding air.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide a tertiary oil and gas recovery device, which is used to solve the problems of low recovery efficiency and excessive gaseous oil concentration in the exhaust gas of the existing tertiary oil and gas recovery devices.

[0006] In order to achieve the above-mentioned purpose, a specific embodiment of the utility model provides a tertiary oil and gas recovery device, which is used to recover the oil and gas in the oil storage tank. The tertiary oil and gas recovery device includes a compressor, a condenser, a gas-liquid separator, a drain pipe and an exhaust pipe. The input end of the compressor is connected to the oil storage tank. The input end of the condenser is connected to the output end of the compressor. The gas-liquid separator includes a liquid inlet, a liquid drain and an exhaust port, and the liquid inlet is connected to the output end of the condenser. The drain pipe is connected to the drain port and the oil storage tank. The exhaust pipe is connected to the exhaust port and the oil storage tank.

[0007] In one or more embodiments of the present utility model, the tertiary oil and gas recovery equipment further includes a control valve, and the control valve includes an inlet, a first outlet, and a second outlet.

[0008] In one or more embodiments of the present invention, the exhaust pipe includes a main pipe, a first branch pipe and a second branch pipe, the two ends of the main pipe are respectively connected to the exhaust port and the inlet, the two ends of the first branch pipe are respectively connected to the first outlet and the oil storage tank, and the two ends of the second branch pipe are respectively connected to the second outlet and the input end of the compressor.

[0009] In one or more embodiments of the present invention, the control valve can control the connection and disconnection between the inlet and the first outlet, and the connection and disconnection between the inlet and the second outlet.

[0010] In one or more embodiments of the present invention, the control valve also includes a third outlet, the exhaust pipe also includes a third branch pipe connected to the third outlet, and the end of the third branch pipe away from the third outlet is constructed to be open, and the control valve can control the connection and disconnection of the inlet and the third outlet.

[0011] In one or more embodiments of the present invention, the tertiary oil and gas recovery equipment further includes a concentration detector installed on the main pipeline.

[0012] In one or more embodiments of the present invention, the tertiary oil and gas recovery equipment further includes a drain valve installed on the drainage pipeline.

[0013] In one or more embodiments of the present utility model, the tertiary oil and gas recovery equipment further includes a pressure detector, which is installed on a pipeline connecting the oil storage tank and the compressor.

[0014] In one or more embodiments of the present invention, the tertiary oil and gas recovery equipment further includes a vacuum pump installed on the exhaust pipe, wherein the input end of the vacuum pump is connected to the exhaust port, and the output end of the vacuum pump is connected to the oil storage tank.

[0015] In one or more embodiments of the present invention, the control valve is an electric control valve, and the tertiary oil and gas recovery equipment further includes a controller electrically connected to the control valve, and the controller is used to control the on-off of an internal channel of the control valve.

[0016] In one or more embodiments of the present invention, the control valve is a three-way valve.

[0017] In one or more embodiments of the present invention, the control valve is a four-way valve.

[0018] Compared with the prior art, the tertiary oil and gas recovery equipment of the utility model, in which the exhaust pipe of the gas-liquid separator is connected to the oil storage tank, can transport the uncondensed oil and gas back to the oil storage tank for circulating compression and condensation, avoiding the discharge of oil and gas into the air and reducing the pollution of oil and gas to the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a structural diagram of the tertiary oil and gas recovery equipment in the first embodiment of the utility model;

[0021] Figure 2 This is a structural diagram of the tertiary oil and gas recovery equipment in the second embodiment of the utility model;

[0022] Figure 3 This is a structural diagram of the tertiary oil and gas recovery equipment in Example 3 of the present utility model.

[0023] Explanation of main figure marks: 1. oil storage tank, 2. compressor, 3. condenser, 4. gas-liquid separator, 401. liquid inlet, 402. liquid discharge port, 403. exhaust port, 5. liquid discharge pipe, 6. exhaust pipe, 601. main pipe, 602. first branch pipe, 603. second branch pipe, 604. third branch pipe, 7. control valve, 701. inlet, 702. first outlet, 703. second outlet, 704. third outlet, 8. concentration detector, 9. drain valve, 10. pressure detector, 11. vacuum pump. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] Embodiment 1:

[0026] Reference Figure 1 As shown, the tertiary oil and gas recovery equipment in this embodiment is used to recover the oil and gas in the oil storage tank 1. The tertiary oil and gas recovery equipment includes a compressor 2, a condenser 3, a gas-liquid separator 4, a drainage pipe 5 and an exhaust pipe 6.

[0027] Specifically, the input end of the compressor 2 is connected to the oil storage tank 1, and the input end of the condenser 3 is connected to the output end of the compressor 2. The gas-liquid separator 4 includes a liquid inlet 401, a liquid discharge port 402 and an exhaust port 403, and the liquid inlet 401 is connected to the output end of the condenser 3. The liquid discharge pipe 5 is connected to the liquid discharge port 402 and the oil storage tank 1, and the exhaust pipe 6 is connected to the exhaust port 403 and the oil storage tank 1.

[0028] According to the above structural design, the oil and gas in the oil storage tank 1 are compressed by the compressor 2 to form high-temperature and high-pressure oil and gas. After entering the condenser 3, the high-temperature and high-pressure oil and gas release heat. Most of the high-temperature and high-pressure oil and gas condense into liquid oil, and a small part of the oil and gas exists in the form of gaseous oil and impurity gas. The mixture of liquid oil, gaseous oil and air then enters the gas-liquid separator 4 for gas-liquid separation, wherein the liquid oil flows back to the oil storage tank 1 through the drainage pipe 5, and the mixed gas formed by the gaseous oil and impurity gas flows back to the oil storage tank 1 through the exhaust pipe for secondary recovery.

[0029] It can be seen from the above process that there is no gas emission during the entire oil and gas recovery process, thus avoiding oil and gas pollution of the air environment.

[0030] Reference Figure 1 As shown, the tertiary oil and gas recovery equipment in this embodiment also includes a drain valve 9 installed on the drainage pipeline 5.

[0031] The working principle of the drain valve 9 is based on the control of the internal pressure of the pipeline, that is, the opening and closing of the drain valve 9 is controlled by controlling the pressure in the pipeline.

[0032] Specifically, when the pressure in the drainage pipe 5 reaches a certain value, the drain valve 9 automatically opens to discharge the liquid oil. During the liquid oil discharge process, since there is a certain pressure in the drainage pipe 5, under the action of the pressure, the liquid oil adhering to the inner wall of the drainage pipe 5 can be completely discharged into the oil storage tank 1, avoiding a large amount of liquid oil adhering to the inner wall of the drainage pipe 5, and improving the oil and gas recovery efficiency.

[0033] Reference Figure 1 As shown, the oil storage tank 1 in this embodiment is connected to the input end of the compressor 2 through a pipeline, and a pressure detector 10 is provided on the pipeline connecting the oil storage tank 1 and the compressor 2, which is used to detect the air pressure in the pipeline to detect the oil and gas pressure inside the pipeline, so that the user can adjust the working power of the compressor 2 according to the above oil and gas pressure.

[0034] The tertiary oil and gas recovery equipment in this embodiment also includes a vacuum pump 11, which is installed on the exhaust pipe 6, the input end of the vacuum pump 11 is connected to the exhaust port 403, and the output end of the vacuum pump 11 is connected to the oil storage tank 1.

[0035] The vacuum pump 11 is used to quickly transport the oil and gas in the exhaust pipe 6 to the oil storage tank 1 and prevent the oil and gas in the oil storage tank 1 from entering the exhaust pipe 6 .

[0036] Embodiment 2:

[0037] Reference Figure 2 As shown, the tertiary oil and gas recovery equipment in this embodiment is used to recover the oil and gas in the oil storage tank 1, and the tertiary oil and gas recovery equipment includes a compressor 2, a condenser 3, a gas-liquid separator 4, a drain pipe 5 and an exhaust pipe 6. The structures of the compressor 2, the condenser 3, the gas-liquid separator 4 and the drain pipe 5 are exactly the same as those in the first embodiment, except that the structure of the exhaust pipe 6 in this embodiment and the control valve 7 are also provided in this embodiment.

[0038] Specifically, the control valve 7 in this embodiment includes an inlet 701, a first outlet 702, and a second outlet 703. The exhaust pipe 6 in this embodiment includes a main pipe 601, a first branch pipe 602, and a second branch pipe 603. The two ends of the main pipe 601 are respectively connected to the exhaust port 403 and the inlet 701, the two ends of the first branch pipe 602 are respectively connected to the first outlet 702 and the oil storage tank 1, and the two ends of the second branch pipe 603 are respectively connected to the second outlet 703 and the input end of the compressor 2.

[0039] The control valve 7 can control the connection and disconnection between the inlet 701 and the first outlet 702 , and the connection and disconnection between the inlet 701 and the second outlet 703 .

[0040] In specific applications, the user can set the concentration index of the gaseous oil in the mixed gas in the main pipeline 601. When the concentration of the gaseous oil in the mixed gas is less than or equal to the concentration index, the control valve 7 connects the inlet 701 with the first outlet 702 and disconnects the inlet 701 with the second outlet 703, and the oil and gas in the main pipeline 601 flows back to the oil storage tank 1 through the first branch pipeline 602.

[0041] When the concentration of gaseous oil in the mixed gas is greater than the above concentration index, the control valve 7 disconnects the inlet 701 from the first outlet 702 and connects the inlet 701 with the second outlet 703. The oil and gas in the main pipeline 601 enters the second branch pipeline 603, and then enters the compressor 2 through the input end of the compressor 2 for secondary compression and subsequent secondary condensation.

[0042] The tertiary oil and gas recovery equipment in this embodiment is also provided with a concentration detector 8 , which is installed on the main pipeline 601 . The concentration detector 8 is used to detect the concentration of gaseous oil in the mixed gas inside the main pipeline 601 .

[0043] Furthermore, the control valve 7 in this embodiment is an electrically controlled three-way valve, and the tertiary oil and gas recovery equipment also includes a controller electrically connected to the control valve 7 .

[0044] The controller can be a manual controller, an automatic controller or a manual-automatic controller. The operator can manually adjust the on-off state of the internal channel of the control valve 7 through the manual controller, or can automatically adjust the on-off state of the internal channel of the control valve 7 through the automatic controller.

[0045] When an automatic controller is set up, the automatic controller can be electrically connected to the concentration detector 8 to receive the electrical signal containing concentration information transmitted by the concentration detector 8, and adjust the on / off state of the inlet 701 and the first outlet 702, and the inlet 701 and the second outlet 703 of the control valve 7 according to the electrical signal.

[0046] Reference Figure 2 As shown, the vacuum pump 11 in this embodiment is arranged on the first branch pipeline 602 .

[0047] Embodiment three:

[0048] Reference Figure 3 As shown, the tertiary oil and gas recovery equipment in this embodiment is used to recover the oil and gas in the oil storage tank 1, and the tertiary oil and gas recovery equipment includes a compressor 2, a condenser 3, a gas-liquid separator 4, a drain pipe 5, an exhaust pipe 6, a vacuum pump 11, a concentration detector 8 and a controller. The structures of the compressor 2, the condenser 3, the gas-liquid separator 4, the drain pipe 5 and the vacuum pump 11, the concentration detector 8 and the controller are exactly the same as those in the second embodiment, and the difference lies in the structures of the exhaust pipe 6 and the control valve 7 in this embodiment.

[0049] Specifically, the control valve 7 in this embodiment includes an inlet 701, a first outlet 702, a second outlet 703 and a third outlet 704. The exhaust pipe 6 in this embodiment includes a main pipe 601, a first branch pipe 602, a second branch pipe 603 and a third branch pipe 604, the two ends of the main pipe 601 are respectively connected to the exhaust port 403 and the inlet 701, the two ends of the first branch pipe 602 are respectively connected to the first outlet 702 and the oil storage tank 1, the two ends of the second branch pipe 603 are respectively connected to the second outlet 703 and the input end of the compressor 2, one end of the third branch pipe 604 is connected to the third outlet 704, and the other end of the third branch pipe 604 is constructed to be open and connected to the external environment.

[0050] The control valve 7 can control the connection and disconnection between the inlet 701 and the first outlet 702 , the connection and disconnection between the inlet 701 and the second outlet 703 , and the connection and disconnection between the inlet 701 and the third outlet 704 .

[0051] In specific applications, the user can set a high concentration index and a low concentration index of the gaseous oil in the mixed gas in the main pipeline 601 .

[0052] When the concentration of gaseous oil in the mixed gas is greater than or equal to the above-mentioned high concentration index, the control valve 7 only connects the inlet 701 with the second outlet 703, and the mixed gas in the main pipeline 601 enters the second branch pipeline 603, and then enters the compressor 2 through the input end of the compressor 2 for secondary compression and subsequent secondary condensation.

[0053] When the concentration of gaseous oil in the mixed gas is between the low concentration index and the high concentration index, the control valve 7 only connects the inlet 701 with the first outlet 702, and the mixed gas in the main pipeline 601 flows back to the oil storage tank 1 through the first branch pipeline 602, and is remixed with the oil and gas in the oil storage tank 1, and then undergoes secondary compression and subsequent secondary condensation.

[0054] When the concentration of gaseous oil in the mixed gas is less than or equal to the above-mentioned low concentration index, the control valve 7 only connects the inlet 701 with the third outlet 704, and the oil and gas in the main pipeline 601 enters the third branch pipeline 604 and is discharged to the external environment. The gaseous oil concentration contained in the mixed gas discharged into the air is low, and the harm to the air can be almost ignored.

[0055] The above-mentioned high concentration index and low concentration index can be set according to the corresponding national emission standards, or can be set independently based on actual experience.

[0056] Furthermore, the control valve 7 in this embodiment is an electrically controlled four-way valve.

[0057] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tertiary oil and gas recovery device, which is used to recover oil and gas in an oil storage tank (1), characterized in that: The tertiary oil and gas recovery equipment includes: A compressor (2), an input end of which is in communication with the oil storage tank (1); a condenser (3), the input end of which is connected to the output end of the compressor (2); A gas-liquid separator (4), comprising a liquid inlet (401), a liquid discharge port (402) and an exhaust port (403), wherein the liquid inlet (401) is connected to an output end of the condenser (3); A liquid discharge pipe (5) connected to the liquid discharge port (402) and the oil storage tank (1); An exhaust pipe (6) is in communication with the exhaust port (403) and the oil storage tank (1).

2. The tertiary oil and gas recovery equipment according to claim 1, characterized in that: The tertiary oil and gas recovery device further comprises a control valve (7), wherein the control valve (7) comprises an inlet (701), a first outlet (702) and a second outlet (703); The exhaust pipe (6) comprises a main pipe (601), a first branch pipe (602) and a second branch pipe (603); two ends of the main pipe (601) are respectively connected to the exhaust port (403) and the inlet (701); two ends of the first branch pipe (602) are respectively connected to the first outlet (702) and the oil storage tank (1); and two ends of the second branch pipe (603) are respectively connected to the second outlet (703) and the input end of the compressor (2); The control valve (7) is capable of controlling the connection and disconnection between the inlet (701) and the first outlet (702), and the connection and disconnection between the inlet (701) and the second outlet (703).

3. The tertiary oil and gas recovery equipment according to claim 2, characterized in that: The control valve (7) further comprises a third outlet (704), and the exhaust pipe (6) further comprises a third branch pipe (604) connected to the third outlet (704), and one end of the third branch pipe (604) away from the third outlet (704) is constructed to be open, and the control valve (7) is capable of controlling the connection and disconnection between the inlet (701) and the third outlet (704).

4. The tertiary oil and gas recovery equipment according to claim 2, characterized in that: The tertiary oil and gas recovery equipment further comprises a concentration detector (8) installed on the main pipeline (601).

5. The tertiary oil and gas recovery equipment according to claim 1, characterized in that: The tertiary oil and gas recovery equipment further comprises a drain valve (9) installed on the drainage pipeline (5).

6. The tertiary oil and gas recovery equipment according to claim 1, characterized in that: The tertiary oil and gas recovery equipment further comprises a pressure detector (10), wherein the pressure detector (10) is installed in a pipeline connecting the oil storage tank (1) and the compressor (2).

7. The tertiary oil and gas recovery equipment according to claim 1, characterized in that: The tertiary oil and gas recovery equipment also includes a vacuum pump (11) installed on the exhaust pipe (6), the input end of the vacuum pump (11) is connected to the exhaust port (403), and the output end is connected to the oil storage tank (1).

8. The tertiary oil and gas recovery equipment according to claim 2, characterized in that: The control valve (7) is an electric control valve (7), and the tertiary oil and gas recovery equipment further comprises a controller electrically connected to the control valve (7), and the controller is used to control the opening and closing of the internal channel of the control valve (7).

9. The tertiary oil and gas recovery equipment according to claim 2, characterized in that: The control valve (7) is a three-way valve.

10. The tertiary oil and gas recovery equipment according to claim 3, characterized in that: The control valve (7) is a four-way valve.

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