Crude oil flash evaporation stabilizing system

Abstract

The utility model relates to the technical field of flash evaporation gas treatment, in particular to a crude oil flash evaporation stabilizing system, which comprises a three-phase separator, a gas-phase pipeline, a liquid-phase pipeline, a gas-phase pipeline and a gas-phase pipeline, the flash separator is communicated with the liquid phase pipeline and is provided with a flash steam output pipeline; the venturi jet mechanism is provided with a first inlet, a second inlet and an output port, the first inlet is communicated with the gas phase pipeline, the second inlet is communicated with the flash steam output pipeline, and the output port is connected with a gas pipeline. Crude oil is subjected to three-phase separation, flash separation and step-by-step pressure reduction, the stability of the crude oil in the treatment process can be ensured, meanwhile, through the low-pressure adsorption effect generated by flowing of a high-pressure gas source in the Venturi jet mechanism, after being sucked into a low-pressure gas source to be mixed, the crude oil is diffused and output at a certain speed and pressure, and step-by-step reduction of the airflow velocity is achieved; and the flash steam can be stably and effectively recycled, the recycling energy consumption is low, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of flash gas treatment, in particular to a crude oil flash evaporation and stabilization system. Background Art

[0002] Light hydrocarbons (such as C1 - C4, etc.) are dissolved in condensate oil, which easily leads to a relatively high saturated vapor pressure of crude oil. During the gathering, transportation and storage process, light components with strong volatility will also escape, resulting in a large loss of crude oil. The escaped light components will form explosive hazardous substances when mixed with air, and under the action of light, the light hydrocarbons can form highly toxic photochemical smog in the atmosphere. Crude oil stabilization generally refers to the process of separating light components from crude oil to reduce the evaporation loss of crude oil. Crude oil stabilization is an important measure to improve the safety and environmental protection of the crude oil storage and transportation process.

[0003] The flash evaporation and stabilization process is a relatively simple and widely used one in the crude oil stabilization process, but there are problems such as large fluctuations in the flash gas volume, low pressure, and relatively difficult recovery and treatment. If the flash gas is directly discharged or burned through a flare, it will not only cause waste of resources but also pollute the environment. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiency in the prior art that it is impossible to effectively recover flash gas while meeting crude oil stabilization, and to provide a crude oil flash evaporation and stabilization system.

[0005] The utility model provides a crude oil flash evaporation and stabilization system, comprising:

[0006] A three - phase separator, provided with a gas phase pipeline and a liquid phase pipeline;

[0007] A flash separator, communicated with the liquid phase pipeline, and the flash separator is provided with a flash gas output pipeline;

[0008] A Venturi jet mechanism, provided with a first inlet, a second inlet and an outlet, the first inlet is communicated with the gas phase pipeline, the second inlet is communicated with the flash gas output pipeline, and the outlet is connected to a gas - using pipeline.

[0009] A crude oil flashing stabilization system of the utility model. The crude oil is subjected to three-phase separation and then flashing separation, with step-by-step pressure reduction, which can ensure the stability of the crude oil during the treatment process. At the same time, the gas phase separated from the crude oil before the flashing process is input into the Venturi jet mechanism as a high-pressure gas source, and the flashing gas generated by the flash separator during the flashing process is input into the Venturi jet mechanism as a low-pressure gas source. Through the low-pressure adsorption effect generated by the flow of the high-pressure gas source in the Venturi jet mechanism, the low-pressure gas source is inhaled and mixed, and then diffused and output at a certain speed and pressure, realizing the step-by-step reduction of the air flow velocity. Then it is sent to the gas pipeline for recycling, which can realize the stable and effective recovery of the flashing gas, with low recovery energy consumption and low cost.

[0010] Preferably, a first switch valve and a first check valve are provided between the gas phase pipeline and the first inlet; a second switch valve and a second check valve are provided on the flashing gas output pipeline. The flow direction of the air flow is limited by the first check valve and the second check valve, and the output control of the gas phase in the crude oil and the flashing gas is realized through the first switch valve and the second switch valve.

[0011] Preferably, the gas phase pipeline is externally connected to a pipeline to communicate with the gas pipeline for use. A third switch valve, a regulating valve and a fourth switch valve are sequentially provided between the gas phase pipeline and the gas pipeline for use. The regulating valve can adjust the air flow pressure entering the gas pipeline for use, avoiding excessive pressure fluctuations affecting the gas pipeline for use. The third switch valve and the fourth switch valve can control the connection and disconnection between the gas phase pipeline and the gas pipeline for use, thereby realizing the control of the pressure and flow rate of the air flow entering the Venturi jet mechanism.

[0012] Preferably, a vent pipeline is externally connected between the fourth switch valve and the gas pipeline for use. For safe venting of the air flow when necessary.

[0013] Preferably, the three-phase separator and the flash separator are respectively externally connected to vent pipelines. For safe venting of the air flow when necessary.

[0014] Preferably, the flash separator is provided with a pressure monitoring mechanism, and the Venturi jet mechanism is provided with an actuator for adjusting the gas source flow area, and the pressure monitoring mechanism is linked with the actuator. The Venturi jet mechanism adjusts the gas source flow area according to the pressure signal, so as to control the gas volume of the high-pressure gas source and achieve the purpose of maintaining the pressure stability of the flash separator.

[0015] Preferably, the output port is connected to a filter separator, the filter separator is connected to the gas pipeline for use, and a fifth switch valve and a third check valve are provided between the output port and the filter separator. To further remove the liquid in the air flow so that the air flow can enter the gas pipeline for use directly.

[0016] Preferably, the gas pipeline includes an export pipeline and / or a fuel gas pipeline. The export pipeline is an external pipeline of the station connecting to the user side, and the fuel gas pipeline is an internal pipeline of the station for equipment operation or living needs.

[0017] Preferably, the output port is connected to the export pipeline and the fuel gas pipeline. The export pipeline and the fuel gas pipeline are connected through a bypass pipeline, and a sixth switch valve and a fourth check valve are provided on the bypass pipeline. This enables selective control of the external transportation of the gas flow or its use within the station according to actual situations.

[0018] Preferably, the three-phase separator is connected to the sewage storage mechanism through a pipeline, the flash separator is connected to the crude oil storage tank through a pipeline, and the filter separator is connected to the sewage storage mechanism.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The present utility model provides a crude oil flash stabilization system. By separating the crude oil through three-phase separation and then performing flash separation and gradually reducing the pressure, it can ensure the stability of the crude oil during the treatment process.

[0021] 2. The present utility model provides a crude oil flash stabilization system. By using the gas phase separated from the crude oil before the flash process as a high-pressure gas source and inputting it into the Venturi jet mechanism, and using the flash gas generated during the flash process of the flash separator as a low-pressure gas source and inputting it into the Venturi jet mechanism, through the low-pressure adsorption effect generated by the flow of the high-pressure gas source in the Venturi jet mechanism, after inhaling and mixing with the low-pressure gas source, it diffuses and outputs at a certain speed and pressure, realizing the gradual reduction of the gas flow velocity, and then sending it into the gas pipeline for recycling. It can achieve the stable and effective recovery of the flash gas, with low recovery energy consumption and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a crude oil flash stabilization system for Embodiment 1;

[0023] Figure 2 It is a schematic structural diagram of a crude oil flash stabilization system for Embodiment 2;

[0024] Figure 3 It is a schematic structural diagram of a crude oil flash stabilization system for Embodiment 3;

[0025] Markings in the figure:

[0026] 1 - Three-phase separator, 2 - Flash separator, 21 - Flash gas output pipeline, 22 - Second switching valve, 23 - Second check valve, 24 - Pressure monitoring mechanism, 3 - Venturi jet mechanism, 31 - First inlet, 32 - Second inlet, 33 - Outlet, 34 - Fifth switching valve, 35 - Third check valve, 4 - Gas pipeline, 41 - First switching valve, 42 - First check valve, 43 - Third switching valve, 44 - Regulating valve, 45 - Fourth switching valve, 5 - Liquid pipeline, 6 - Gas use pipeline, 61 - External output pipeline, 62 - Fuel gas pipeline, 7 - Venting pipeline, 8 - Filter separator, 9 - Bypass pipeline, 91 - Sixth switching valve, 92 - Fourth check valve, 10 - Sewage storage mechanism, 20 - Crude oil storage tank. Specific embodiments

[0027] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. Any technology implemented based on the content of the present utility model belongs to the scope of the present utility model.

[0028] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product / device / equipment is normally used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0030] In addition, the use of terms such as "first", "second", "third", etc. in the terminology is only for distinguishing the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0031] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation exceeding 9.

[0032] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be common connection means in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0033] Embodiment 1

[0034] As Figure 1 shown, a crude oil flash stabilization system includes a three-phase separator 1, a flash separator 2 and a Venturi jet mechanism 3. The three-phase separator 1 is provided with a gas-phase pipeline 4 and a liquid-phase pipeline 5. The flash separator 2 is provided with a flash gas output pipeline 21. The Venturi jet mechanism 3 is provided with a first inlet 31, a second inlet 32 and an outlet 33. The first inlet 31 is communicated with the gas-phase pipeline 4. The second inlet 32 is communicated with the flash gas output pipeline 21. The outlet 33 is connected to a gas use pipeline 6.

[0035] In one or several embodiments, the mixture including crude oil extracted is input into the three-phase separator 1 for oil-gas-water three-phase separation.

[0036] Specifically, the crude oil after three-phase separation enters the flash separator 2 through the liquid-phase pipeline 5 for pressure-reducing flash evaporation. Only after the flash-stabilized crude oil can it be transported to the crude oil storage tank 20 through the oil discharge pipeline at the bottom of the flash separator 2, so that the extracted crude oil is depressurized step by step and the flash evaporation process is stable.

[0037] Specifically, the high-pressure gas after three-phase separation is input into the first inlet 31 of the Venturi jet mechanism 3 as a high-pressure gas source. As a driving gas source, during the flow of the gas stream, according to the Venturi effect, the gas stream generates a supersonic gas stream through the Laval nozzle, creates a low pressure near the high-speed flowing gas, and generates an adsorption effect to adsorb the flash gas generated during the flash evaporation process of the flash separator 2 into the Venturi jet mechanism 3 for mixing, becoming a mixed gas with a unified speed and pressure. Then, it enters the diffuser section of the Venturi jet mechanism 3, where the speed of the mixed gas stream gradually decreases, and finally, a mixed gas stream with a pressure between the high-pressure gas source and the flash gas pressure is output through the outlet 33 and sent to the gas pipeline 6 for use, realizing the stable and effective recovery and utilization of the flash gas, with low recovery energy consumption and low cost.

[0038] Specifically, the solids and sewage after three-phase separation are input into the sewage storage mechanism 10 for centralized treatment.

[0039] In an optional implementation manner, a first on-off valve 41 and a first check valve 42 are provided between the gas pipeline 4 and the first inlet 31; a second on-off valve 22 and a second check valve 23 are provided on the flash gas output pipeline 21. The flow direction of the gas stream is limited by the first check valve 42 and the second check valve 23 to only flow from the three-phase separator 1 and the flash separator 2 towards the Venturi jet mechanism 3. The output control of the gas phase in the crude oil and the flash gas is realized through the first on-off valve 41 and the second on-off valve 22 to control the flow parameters of the gas stream, avoid causing excessive pressure fluctuations to affect the flash separator 2, and maintain the pressure stability during the flash evaporation process.

[0040] In one or several implementation manners, the flash separator 2 is provided with a pressure monitoring mechanism 24, and the Venturi jet mechanism 3 is provided with an actuator. The actuator is used to adjust the gas source flow area of the Venturi jet mechanism 3, and the pressure monitoring mechanism 24 is linked with the actuator. By means of the pressure monitoring mechanism 24, the pressure inside the flash separator 2 can be monitored. A pressure transmitter can be used for pressure monitoring. The pressure signal is transmitted to the actuator through the pressure transmitter, so that the actuator of the Venturi jet mechanism 3 adjusts the gas source flow area of the high-pressure part according to the pressure signal, thereby controlling the gas volume of the high-pressure gas source and achieving the purpose of maintaining the pressure stability of the flash separator 2.

[0041] In one or several implementation manners, the three-phase separator 1 and the flash separator 2 are respectively externally connected to a vent pipeline 7. The gas generated by the three-phase separation and / or the flash gas generated by the flash separator 2 can be vented through the vent pipeline 7 for venting treatment to perform safe venting when necessary and ensure the use safety.

[0042] In one or several embodiments, the gas pipeline 6 includes an export pipeline 61 and / or a fuel gas pipeline 62. The export pipeline 61 is an external pipeline of the station connecting to the user side, and the fuel gas pipeline 62 is an internal pipeline of the station for equipment operation or living needs.

[0043] In an alternative embodiment, the gas pipeline 6 only includes the export pipeline 61, or the gas pipeline 6 only includes the fuel gas pipeline 62, so that the mixed gas flow after passing through the Venturi jet mechanism 3 can be selectively fed into the export pipeline 61 or the fuel gas pipeline 62 for use.

[0044] In an alternative embodiment, the gas pipeline 6 includes an export pipeline 61 and a fuel gas pipeline 62. The export pipeline 61 and the fuel gas pipeline 62 are connected by a bypass pipeline 9. A sixth shut-off valve 91 and a fourth check valve 92 are provided on the bypass pipeline 9, so that according to the actual situation, the opening and closing of the sixth shut-off valve 91 can be adjusted to realize the recycling destination of the mixed gas flow, and it can be selectively fed into the export pipeline 61 and / or the fuel gas pipeline 62 for use.

[0045] In an alternative embodiment, the first shut-off valve 41, the second shut-off valve 22, and the sixth shut-off valve 91 can all be globe valves, and the valves on each pipeline and pipeline can be increased, decreased, and adjusted according to the actual situation.

[0046] Embodiment 2

[0047] As Figure 2 shown, a crude oil flash stabilization system of this embodiment has a similar structure to that of Embodiment 1, except that: the gas pipeline 4 is also externally connected to the gas pipeline 6 through a pipeline, and a third shut-off valve 43, a regulating valve 44, and a fourth shut-off valve 45 are sequentially provided between the gas pipeline 4 and the gas pipeline 6.

[0048] In a crude oil flash stabilization system of this embodiment, the regulating valve 44 can adjust the air flow pressure entering the gas pipeline 6 to avoid excessive pressure fluctuations affecting the gas pipeline 6. The third shut-off valve 43 and the fourth shut-off valve 45 can control the connection and disconnection between the gas pipeline 4 and the gas pipeline 6, thereby realizing the control of the pressure and flow rate of the air flow entering the Venturi jet mechanism 3. By directly connecting the gas pipeline 4 to the gas pipeline 6 through a pipeline, the high-pressure gas source separated from the three-phase separator 1 can be selectively exported directly through the gas pipeline 6 for use, or part of it can be used as a driving gas source after passing through the Venturi jet mechanism 3, increasing the available options and ensuring the safe use of the crude oil flash stabilization system.

[0049] In one or several embodiments, a vent pipeline 7 is externally connected between the fourth shut-off valve 45 and the gas pipeline 6, and the air flow can be safely vented when necessary.

[0050] In an alternative embodiment, the third switching valve 43 and the fourth switching valve 45 can both be globe valves, and the regulating valve 44 can be a self-operated regulating valve. Valves can be added, reduced, and adjusted on each pipeline according to actual conditions.

[0051] Embodiment 3

[0052] As Figure 3 shown, a crude oil flash stabilization system of this embodiment has a structure similar to that of Embodiment 1 and Embodiment 2, except that: the output port 33 is further connected to a filter separator 8, the filter separator 8 is connected to a gas pipeline 6, and a fifth switching valve 34 and a third check valve 35 are provided between the output port 33 and the filter separator 8.

[0053] A crude oil flash stabilization system of this embodiment inputs the mixed gas flow passing through the Venturi jet mechanism 3 into the filter separator 8 to separate the liquid in the mixed gas flow, so that the separated gas can be directly used as the fuel gas of the station or can be exported according to the external export pressure conditions.

[0054] In an alternative embodiment, the filter separator 8 is connected to a sewage storage mechanism 10.

[0055] In an alternative embodiment, the fifth switching valve 34 can be a globe valve. Valves can be added, reduced, and adjusted on each pipeline according to actual conditions.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A crude oil flash stabilization system, characterized in that: include: A three-phase separator (1) provided with a gas phase pipeline (4) and a liquid phase pipeline (5); A flash separator (2) is connected to the liquid phase pipeline (5), and the flash separator (2) is provided with a flash gas output pipeline (21); The venturi jet mechanism (3) is provided with a first inlet (31), a second inlet (32) and an outlet (33), wherein the first inlet (31) is connected to the gas phase pipeline (4), the second inlet (32) is connected to the flash gas outlet pipeline (21), and the outlet (33) is connected to the gas pipeline (6).

2. A crude oil flash stabilization system according to claim 1, characterized in that: A first switch valve (41) and a first check valve (42) are provided between the gas phase pipeline (4) and the first inlet (31); The flash steam output pipeline (21) is provided with a second switch valve (22) and a second check valve (23).

3. A crude oil flash stabilization system according to claim 1, characterized in that: The gas phase pipeline (4) is connected to the gas pipeline (6) through an external pipeline, and a third switch valve (43), a regulating valve (44) and a fourth switch valve (45) are sequentially arranged between the gas phase pipeline (4) and the gas pipeline (6).

4. A crude oil flash stabilization system according to claim 3, characterized in that: An external venting pipeline (7) is connected between the fourth switch valve (45) and the gas pipeline (6).

5. A crude oil flash stabilization system according to claim 4, characterized in that: The three-phase separator (1) and the flash separator (2) are respectively connected to an external venting pipeline (7).

6. A crude oil flash stabilization system according to claim 1, characterized in that: The flash separator (2) is provided with a pressure monitoring mechanism (24), and the Venturi jet mechanism (3) is provided with an actuator, the actuator is used to adjust the gas source flow area, and the pressure monitoring mechanism (24) is linked to the actuator.

7. A crude oil flash stabilization system according to any one of claims 1 to 6, characterized in that: The output port (33) is connected to a filter separator (8), and the filter separator (8) is connected to the gas pipeline (6). A fifth switch valve (34) and a third check valve (35) are provided between the output port (33) and the filter separator (8).

8. A crude oil flash stabilization system according to claim 7, characterized in that: The gas pipeline (6) comprises an external transmission pipeline (61) and / or a fuel gas pipeline (62).

9. A crude oil flash stabilization system according to claim 8, characterized in that: The output port (33) is connected to the external transmission pipeline (61) and the fuel gas pipeline (62); the external transmission pipeline (61) and the fuel gas pipeline (62) are in communication via a bypass pipeline (9); and a sixth switch valve (91) and a fourth check valve (92) are provided on the bypass pipeline (9).

10. A crude oil flash stabilization system according to claim 8, characterized in that: The three-phase separator (1) is connected to a sewage storage mechanism (10) through a pipeline, the flash separator (2) is connected to a crude oil storage tank (20) through a pipeline, and the filter separator (8) is connected to the sewage storage mechanism (10).

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