Compact gas condensate unpowered negative pressure flash unit

Abstract

The utility model relates to condensate oil processing technical field, and compact gas condensate unpowered negative pressure flash evaporator, including the flash evaporator, one side of flash evaporator is connected with liquid inlet pipe, the top of flash evaporator is connected with negative pressure ejector through negative pressure ejector gas extraction connecting pipe, the front end of negative pressure ejector is connected with negative pressure ejector power gas inlet pipe, the other end of negative pressure ejector power gas inlet pipe is connected with the air outlet end of flash pressure regulator, the air inlet end of flash pressure regulator is connected with high pressure natural gas pipe, the rear end of negative pressure ejector is connected with negative pressure ejector mixed gas air outlet pipe, the bottom of flash evaporator is connected with liquid discharge pipe, the other end of liquid discharge pipe is connected with the import end of liquid discharge pump, and the export end of liquid discharge pump is connected with export pipe, the utility model discloses under the condition of satisfying condensate oil storage safety, can realize flash evaporation gas full recovery, zero emission, effectively reduces the energy consumption in the flash evaporation process simultaneously, has better safety, environmental protection, energy saving and so on effect.

Description

Technical Field

[0001] This utility model relates to the field of condensate oil treatment technology, specifically to a non-powered negative pressure flash evaporation device for tight gas condensate oil. Background Technology

[0002] Currently, condensate oil contained in tight gas is usually mixed with natural gas and transported to gas gathering stations for oil-water separation before being directly introduced into condensate oil storage tanks for depressurization flash evaporation or atmospheric pressure heating flash evaporation. Direct depressurization flash evaporation in condensate oil storage tanks cannot meet the requirements for stable condensate oil, and unstable storage poses a significant safety risk; atmospheric pressure heating flash evaporation has high energy consumption; furthermore, the flash vapor from both of these flash evaporation processes can only be directly vented into the station's flare system, making effective recovery impossible, resulting in resource waste and environmental pollution. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a non-powered negative pressure flash evaporation device for tight gas condensate oil, which can solve the problems of high energy consumption, difficulty in flash vapor recovery, and poor pressure reduction flash evaporation effect in the traditional flash evaporation stabilization process for condensate oil.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A tight gas condensate oil non-powered negative pressure flash evaporation device includes a flash tank with an inlet pipe connected to one side; a negative pressure ejector connected to the top of the flash tank via a negative pressure ejector exhaust connection pipe, a negative pressure ejector power gas inlet pipe connected to the front end of the negative pressure ejector, the other end of the negative pressure ejector power gas inlet pipe connected to the outlet end of a flash evaporation pressure regulator, and a high-pressure natural gas pipe connected to the inlet end of the flash evaporation pressure regulator; a negative pressure ejector mixed gas outlet pipe connected to the rear end of the negative pressure ejector; and a drain pipe connected to the bottom of the flash tank, the other end of which is connected to the inlet end of a drain pump, and an outlet pipe connected to the outlet end of the drain pump.

[0006] Preferably, the flash tank is equipped with an auxiliary heater, and a mist eliminator is provided on the inner top wall of the flash tank. The mist eliminator is installed below the suction connection pipe of the negative pressure ejector.

[0007] Preferably, the negative pressure ejector mixed gas outlet pipe is equipped with a mixed gas pressure transmitter, the negative pressure ejector mixed gas outlet pipe is connected to the flash tank through a gas supply pipe, and the gas supply pipe is equipped with a gas supply regulator.

[0008] Preferably, the flash tank is provided with an overpressure vent pipe at the top, and the overpressure vent pipe is provided with an overpressure safety valve.

[0009] Preferably, the flash tank is further equipped with a flash tank temperature transmitter, a level gauge, and a flash tank pressure transmitter.

[0010] Preferably, the negative pressure ejector is equipped with a power gas pressure transmitter on the power gas inlet pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the technical solution of this utility model can achieve full recovery and zero emission of flash vapor while meeting the safety requirements of condensate oil storage, and effectively reduce energy consumption in the flash evaporation process, thus having good safety, environmental protection and energy-saving effects. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 This is a schematic diagram of the overall process of this utility model.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. High-pressure natural gas pipeline; 2. Flash evaporator pressure regulator; 3. Negative pressure ejector power gas inlet pipe; 4. Negative pressure ejector; 5. Negative pressure ejector venting connection pipe; 6. Negative pressure ejector mixed gas outlet pipe; 7. Overpressure vent pipe; 8. Liquid inlet pipe; 9. Mist eliminator; 10. Auxiliary heater; 11. Flash tank; 12. Drain pipe; 13. Drain pump; 14. Outlet pipe; 15. Make-up gas regulator; 16. Flash tank temperature transmitter; 17. Liquid level gauge; 18. Flash tank pressure transmitter; 19. Mixed gas pressure transmitter; 20. Power gas pressure transmitter; 21. Overpressure safety valve. Detailed Implementation

[0016] The invention will now be described in detail with reference to the accompanying drawings, by way of example. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments.

[0017] Example

[0018] like Figure 1As shown, this utility model discloses a non-powered negative pressure flash evaporation device for tight gas condensate oil, including a flash tank 11, with an inlet pipe 8 connected to one side of the flash tank 11; a negative pressure ejector 4 is connected to the top of the flash tank 11 via a negative pressure ejector exhaust connection pipe 5, and a negative pressure ejector power gas inlet pipe 3 is connected to the front end of the negative pressure ejector 4. A power gas pressure transmitter 20 is provided on the negative pressure ejector power gas inlet pipe 3, and the other end of the negative pressure ejector power gas inlet pipe 3 is connected to the outlet of the flash pressure regulator 2. The flash pressure regulator 2 is connected to a high-pressure natural gas pipe 1 at its inlet end. The flash pressure regulator 2 controls the negative pressure of the flash tank 11 by adjusting the amount of gas entering the negative pressure ejector power gas inlet pipe 3. The rear end of the negative pressure ejector 4 is connected to a negative pressure ejector mixed gas outlet pipe 6, which is equipped with a mixed gas pressure transmitter 19. The negative pressure ejector mixed gas outlet pipe 6 is connected to the flash tank 11 via a make-up gas pipe, which is equipped with a make-up gas regulator 15. A drain pipe 12 is connected to the bottom of the flash tank 11. The other end of the drain pipe 12 is connected to the inlet end of a drain pump 13, and the outlet end of the drain pump 13 is connected to an outlet pipe 14. The drain pump 13 facilitates the transport of the flashed condensate oil to a stable condensate oil storage tank outside the unit.

[0019] Furthermore, in this embodiment, an auxiliary heater 10 is provided inside the flash tank 11. The auxiliary heater 10 is electrically heated. When the temperature inside the tank cannot meet the requirements for flash stabilization, the auxiliary heater 10 is turned on to maintain the temperature of the flash tank 11. A mist eliminator 9 is provided on the inner top wall of the flash tank 11. The mist eliminator 9 is installed below the negative pressure ejector exhaust connection pipe 5.

[0020] Furthermore, in this embodiment, the top of the flash tank 11 is provided with an overpressure vent pipe 7, and the overpressure vent pipe 7 is provided with an overpressure safety valve 21 to meet the venting requirements of overpressure and fire accidents.

[0021] Furthermore, in this embodiment, the flash tank 11 is also equipped with a flash tank temperature transmitter 16, a level gauge 17, and a flash tank pressure transmitter 18.

[0022] Working principle: Unstable condensate oil enters flash tank 11 through inlet pipe 8 for negative pressure flash evaporation. The flash evaporation temperature is automatically controlled by auxiliary heater 10 and flash tank temperature transmitter 16 installed in flash tank 11. Flash tank 11 is equipped with level gauge 17 and is set with high and low level alarm interlock. When the level reaches the high alarm, the drain pump 13 is started. The stable condensate oil after negative pressure flash evaporation is transported to the storage tank through drain pipe 12, drain pump 13 and outlet pipe 14. When the level reaches the low alarm, level gauge 17 interlocks and shuts down drain pump 13.

[0023] The negative pressure of the flash tank 11 is achieved by the negative pressure ejector 4. High-pressure natural gas enters the negative pressure ejector 4 through the high-pressure natural gas pipe 1, the flash pressure regulator 2, and the negative pressure ejector power gas inlet pipe 3. Due to the Venturi effect, a negative pressure chamber is formed in the negative pressure ejector 4. The flash vapor in the flash tank 11 is drawn into the negative pressure ejector 4 through the mist eliminator 9 and the negative pressure ejector gas extraction connection pipe 5. The negative pressure flash vapor is pressurized in the negative pressure ejector 4 and mixed with the high-pressure natural gas. Then it is transported to the station's natural gas system through the negative pressure ejector mixed gas outlet pipe 6.

[0024] The pressure control and protection of the flash tank 11 are achieved by the flash pressure regulator 2, the gas replenishment regulator 15, and the overpressure safety valve 21. During normal operation of the device, the flash pressure regulator 2 is automatically interlocked with the flash tank pressure transmitter 18. When the flash tank pressure transmitter 18 alarms due to excessive negative pressure, the opening of the interlocked flash pressure regulator 2 is reduced, decreasing the amount of power gas flowing through the power gas inlet pipe 3 of the negative pressure ejector. When the negative pressure flash pressure regulator 2 is adjusted to the lower limit of the opening, the flash tank pressure transmitter 18 continues to alarm due to excessive negative pressure. At this time, the automatic interlocked gas replenishment regulator 15 automatically replenishes gas. When the flash tank pressure transmitter 18 alarms due to insufficient negative pressure, the opening of the interlocked flash pressure regulator 2 increases, increasing the flow of power gas through the power gas inlet pipe 3 of the negative pressure ejector. When the negative pressure flash pressure regulator 2 is adjusted to its upper limit, the flash tank pressure transmitter 18 continues to alarm due to insufficient negative pressure. At this time, the automatic interlocked auxiliary heater 10 starts and provides auxiliary heating to the unstable condensate oil in the flash tank 11 to ensure the flash evaporation effect. The auxiliary heating temperature is determined based on the negative pressure value detected by the flash tank pressure transmitter 18. Simultaneously, a power gas pressure transmitter 20 is installed in the power gas inlet pipe 3 of the negative pressure ejector, and a mixed gas pressure transmitter 19 is installed in the mixed gas outlet pipe 6 of the negative pressure ejector to monitor the power gas and mixed gas pressures.

[0025] The flash tank 11 is equipped with an overpressure safety valve 21 and an overpressure venting pipe 7, which automatically vents when an overpressure condition or accident occurs, thereby protecting the pressure of the flash tank 11.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and application concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A compact gas condensate unpowered negative pressure flash unit comprising a flash tank (11), characterized in that: The flash tank (11) is connected with a liquid inlet pipe (8) on one side; the top of the flash tank (11) is connected with a negative pressure ejector (4) through a negative pressure ejector gas extraction connecting pipe (5), the front end of the negative pressure ejector (4) is connected with a negative pressure ejector power gas inlet pipe (3), the other end of the negative pressure ejector power gas inlet pipe (3) is connected with a gas outlet end of a flash pressure regulator (2), the gas inlet end of the flash pressure regulator (2) is connected with a high-pressure natural gas pipe (1); the rear end of the negative pressure ejector (4) is connected with a negative pressure ejector mixed gas outlet pipe (6); the bottom of the flash tank (11) is connected with a liquid outlet pipe (12), the other end of the liquid outlet pipe (12) is connected with an inlet end of a liquid outlet pump (13), the outlet end of the liquid outlet pump (13) is connected with an outlet pipe (14).

2. The compact gas condensate oil unpowered negative pressure flash device according to claim 1, characterized in that: An auxiliary heater (10) is arranged in the flash tank (11), a mist catcher (9) is arranged on the inner top wall of the flash tank (11), and the mist catcher (9) is arranged below the negative pressure ejector gas extraction connecting pipe (5).

3. The compact gas condensate oil unpowered negative pressure flash device of claim 1, wherein: A mixed gas pressure transmitter (19) is arranged on the negative pressure ejector mixed gas outlet pipe (6), the negative pressure ejector mixed gas outlet pipe (6) is communicated with the flash tank (11) through a gas supplement pipe, and a gas supplement regulator (15) is arranged on the gas supplement pipe.

4. The compact gas condensate oil unpowered negative pressure flash device of claim 1, wherein: An overpressure vent pipe (7) is arranged on the top of the flash tank (11), and an overpressure safety valve (21) is arranged on the overpressure vent pipe (7).

5. The compact gas condensate oil unpowered negative pressure flash device of claim 1, wherein: A flash tank temperature transmitter (16), a liquid level meter (17) and a flash tank pressure transmitter (18) are further arranged on the flash tank (11).

6. The compact gas condensate oil unpowered negative pressure flash device of claim 1, wherein: A power gas pressure transmitter (20) is arranged on the negative pressure ejector power gas inlet pipe (3).

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