Compressor assembly including separator and ejector pump

• US 8,408,879 B2
• Filed: 03/05/2009
• Issued: 04/02/2013
• Est. Priority Date: 03/05/2008
• Status: Expired due to Fees

• Current Assignee: Dresser-Rand Group Incorporated (Siemens AG)
• Original Assignee: Dresser-Rand Group Incorporated (Siemens AG)
• Inventors: Kidd, H. Allan, Chochua, Gocha, Maier, William C.
• Primary Examiner(s): Bertheaud, Peter J
• Assistant Examiner(s): LETTMAN, BRYAN MATTHEW
• Application Number:
  US12/919,977
• Publication Number:
  US 20110017307A1
• Time in Patent Office: 1,489 Days
• Field of Search: 417/53, 417/76, 417/84, 417/158, 417/118, 417/201, 417/203, 417/205, 417/251, 417/423.1, 961/55, 962/04, 962/06, 962/08, 137/565.22, 137/565.29, 137/565.33, 137/565.32, 952/41, 952/54
• US Class Current: 417/84
• CPC Class Codes: F04D 17/122 the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
• CPC Class Codes: F04D 31/00 Pumping liquids and elastic fluids at the same time
• CPC Class Codes: F04F 5/10 displacing liquids, e.g. containing solids, or liquids and elastic fluids
• CPC Class Codes: F04F 5/12 of multi-stage type
• CPC Class Codes: Y10T 137/0318 Processes
• CPC Class Codes: Y10T 137/86075 And jet-aspiration type pump
• CPC Class Codes: Y10T 137/86155 One pump driven by motive fluid from the other
• CPC Class Codes: Y10T 137/86163 Parallel

Abstract

A fluid processing device for processing a multiphase fluid stream including a mixture of at least a gas and a liquid is disclosed. The fluid processing device may include at least one separator configured to separate the fluid stream into a liquid portion and a gaseous portion and deposit the liquid portion into a liquid reservoir. The gaseous portion may be directed to a compressor configured to pressurize and discharge a pressurized gas into a fluid discharge line. A portion of the pressurized gas may be further pressurized and directed to at least one ejector pump fluidly coupled to the liquid reservoir and configured to draw in liquid and discharge pressurized liquid into the fluid discharge line.

Claims

1. A fluid processing device for processing a multiphase fluid stream having a mixture of at least a gas and a liquid, the fluid processing device comprising:

at least one separator configured to separate the multiphase fluid stream into a substantially liquid component and a substantially gaseous component;

a liquid reservoir having an inlet and an outlet, wherein the inlet is fluidly coupled to the at least one separator such that the substantially liquid component flows into the liquid reservoir;

a compressor having an inlet and an outlet, wherein the inlet of the compressor is fluidly coupled with an outlet of the at least one separator so as to receive and pressurize the substantially gaseous component, thereby discharging a pressurized gas through the outlet of the compressor;

an ejector pump fluidly coupled to both the compressor and the liquid reservoir, wherein the ejector pump receives at least some of the pressurized gas from the compressor to draw in a flow of the substantially liquid component from the liquid reservoir and to discharge a combined stream of liquid and pressurized gas; and

a fluid discharge line fluidly coupled to the outlet of the compressor and configured to receive both the pressurized gas from the compressor and the combined stream of liquid and pressurized gas from the ejector pump, thereby forming a pressurized multiphase fluid stream.

2. The fluid processing device of claim 1, wherein the ejector pump is a single stage ejector pump or a multistage ejector pump.

3. The fluid processing device of claim 1, wherein the ejector pump comprises:

a housing having an interior mixing chamber and a suction inlet configured to fluidly connect the liquid reservoir to the interior mixing chamber;

a nozzle having an inlet fluidly coupled to the compressor and an outlet fluidly coupled to the interior mixing chamber, wherein the nozzle is configured to accelerate a flow of at least some of the pressurized gas from the compressor into the interior mixing chamber such that a flow of the substantially liquid component from the liquid reservoir is drawn through the suction inlet and into the interior mixing chamber, thereby mixing with the accelerated pressurized gas resulting in a mixed fluid stream; and

a diffuser having an inlet fluidly coupled with the interior mixing chamber and an outlet fluidly coupled to the fluid discharge line, wherein the diffuser is configured to receive the mixed fluid stream and discharge the combined stream of liquid gas into the fluid discharge line.

4. The fluid processing device of claim 3, wherein the nozzle is configured to accelerate the flow of at least some of the pressurized gas from the compressor to at least a supersonic velocity.

5. The fluid processing device of claim 1, wherein the compressor further comprises:

a casing;

a shaft rotatably disposed within the casing;

first and second primary impellers mounted on the shaft, each having an inlet and an outlet, wherein the inlet of the first primary impeller is fluidly coupled to the inlet of the compressor and the outlet of the second primary impeller is fluidly coupled to the outlet of the compressor such that the pressurized gas flows to the compressor outlet; and

a secondary impeller mounted on the shaft adjacent the second primary impeller and having an inlet fluidly coupled to the outlet of the compressor such that at least some of the pressurized gas flows from the outlet of the second primary impeller to the inlet of the secondary impeller, wherein the secondary the impeller is configured to increase the pressure of the pressurized gas entering the secondary impeller.

6. The fluid processing device of claim 5, wherein the secondary impeller further comprises an outlet fluidly coupled to the ejector pump, wherein the pressurized gas that enters the secondary impeller then exits the secondary impeller and is introduced to the ejector pump.

7. The fluid processing device of claim 6, wherein the ejector pump has at least one nozzle fluidly coupled to the outlet of the secondary impeller such that the at least some of the pressurized gas from the secondary impeller flows into the at least one nozzle.

8. The fluid processing device of claim 5, wherein the compressor further includes a divider wall disposed between the second primary impeller and the secondary impeller, and at least one diverter passage through the divider wall configured to fluidly connect the outlet of the second primary impeller with the inlet of the secondary impeller.

9. The fluid processing device of claim 5, wherein the secondary impeller is configured to increase the pressure of the pressurized gas flowing from the outlet of the second primary impeller by between about 50 psi and about 100 psi.

10. The fluid processing device of claim 5, further comprising a driver operatively coupled to the shaft and configured to rotate the shaft about a central axis.

11. The fluid processing device of claim 10, wherein the driver comprises an electric motor, a hydraulic motor, an internal combustion engine, a gas turbine, or a combination thereof.

12. The fluid processing device of claim 1, wherein the compressor comprises a casing providing the inlet and outlet of the compressor and at least one impeller disposed within the casing, and the at least one separator comprises:

a first separator having an inlet fluidly coupled to a fluid source and an outlet fluidly coupled with the inlet of the compressor; and

a second separator disposed within the casing and having an inlet fluidly coupled to the inlet of the compressor and an outlet fluidly coupled to the at least one impeller.

13. The fluid processing device of claim 12, wherein the first separator is a static separator.

14. The fluid processing device of claim 13, wherein the second separator is a rotary separator.

15. A fluid processing device for processing a multiphase fluid stream having a mixture of at least a gas and a liquid, the fluid processing device comprising:

a first separator fluidly coupled to a multiphase fluid source and configured to separate the multiphase fluid stream into a substantially liquid component and a substantially gaseous component;

a liquid reservoir having an inlet and an outlet, wherein the inlet is fluidly coupled to the first separator such that the substantially liquid component flows into the liquid reservoir;

a compressor having an inlet and an outlet, wherein the inlet of the compressor is fluidly coupled to the first separator to receive the substantially gaseous component, the compressor being configured to pressurize the substantially gaseous component and discharge pressurized gas through the outlet of the compressor;

a first ejector pump fluidly coupled to both the compressor and the liquid reservoir, wherein the first ejector pump is configured to receive pressurized gas from the compressor to draw in a flow of the substantially liquid component from the liquid reservoir and to discharge a first pressurized liquid;

a second ejector pump fluidly coupled to both the compressor and the first ejector pump, wherein the second ejector pump is configured to receive pressurized gas from the compressor to draw in the first pressurized liquid from the first ejector pump and to discharge a second pressurized liquid; and

a fluid discharge line fluidly coupled to the outlet of the compressor and configured to receive pressurized gas from the compressor and to receive the second pressurized liquid from the second ejector pump to provide a pressurized multiphase fluid stream.

16. The fluid processing device of claim 15, wherein the first ejector pump comprises:

a housing having a first interior mixing chamber and a suction inlet configured to fluidly connect the liquid reservoir to the first interior mixing chamber;

a nozzle having an inlet fluidly coupled to the compressor and an outlet fluidly coupled to the first interior mixing chamber, wherein the nozzle is configured to accelerate a first flow of pressurized gas from the compressor into the first interior mixing chamber such that a flow of the substantially liquid component from the liquid reservoir is drawn through the suction inlet and into the first interior mixing chamber, thereby mixing with the first flow of the pressurized gas to provide a first mixed fluid stream; and

a diffuser having an inlet fluidly coupled to the first interior mixing chamber and an outlet fluidly coupled to the second ejector pump, wherein the diffuser is configured to receive the first mixed fluid stream and discharge the first pressurized liquid to the second ejector pump.

17. The fluid processing device of claim 16, wherein the second ejector pump comprises:

a housing having a second interior mixing chamber and a suction inlet configured to fluidly connect the first ejector pump to the second interior mixing chamber;

a nozzle having an inlet fluidly coupled to the compressor and an outlet fluidly coupled to the second interior mixing chamber, wherein the nozzle is configured to accelerate a second flow of the pressurized gas from the compressor into the second interior mixing chamber such that the first pressurized liquid from the first ejector pump is drawn through the suction inlet and into the second interior mixing chamber, thereby mixing with the second flow of the pressurized gas and resulting in a second mixed fluid stream; and

a diffuser having an inlet fluidly coupled with the second interior mixing chamber and an outlet fluidly coupled to the fluid discharge line, wherein the diffuser is configured to receive the second mixed fluid stream and discharge the second pressurized liquid into the fluid discharge line.

18. The fluid processing device of claim 15, wherein the compressor further comprises:

a casing having a shaft rotatably disposed therein and providing the inlet and the outlet of the compressor;

at least one impeller mounted on the shaft and disposed within the casing; and

a second separator disposed within the casing and having an inlet fluidly coupled to the inlet of the compressor and an outlet fluidly coupled to the at least one impeller.

19. The fluid processing device of claim 18, wherein the nozzle of the first ejector pump and the nozzle of the second ejector pump are each configured to accelerate a the pressurized gas from the compressor to a supersonic velocity.

20. A method of processing a multiphase fluid stream including a mixture of a gas and a liquid, comprising:

separating the multiphase fluid stream into a substantially liquid component and a substantially gaseous component using a first separator;

directing the substantially liquid component to a liquid reservoir fluidly coupled to the first separator;

pressurizing the substantially gaseous component in a compressor having an inlet and an outlet, wherein the inlet of the compressor is fluidly coupled to the first separator;

discharging a pressurized gas through the outlet of the compressor;

directing at least some of the pressurized gas from the compressor to an ejector pump fluidly coupled to both the compressor and the liquid reservoir;

drawing in a flow of the substantially liquid component from the liquid reservoir into the ejector pump;

discharging a pressurized liquid from the ejector pump; and

receiving into a fluid discharge line both the pressurized gas from the compressor and the pressurized liquid from the ejector pump, wherein the fluid discharge line is fluidly coupled to both the compressor outlet and the ejector pump, to form a pressurized multiphase fluid stream.

21. The method of claim 20, wherein the compressor further comprises:

a casing having a shaft rotatably disposed therein, the casing providing the inlet and outlet of the compressor;

at least one impeller mounted on the shaft and disposed within the casing; and

a second separator disposed within the casing and having an inlet fluidly coupled to the inlet of the compressor and an outlet fluidly coupled to the at least one impeller.

22. The method of claim 20, wherein the step of directing at least some of the pressurized gas from the compressor to the ejector pump further comprises:

directing at least some of the pressurized gas from the compressor to a secondary impeller having an inlet and an outlet;

increasing the pressure of the pressurized gas directed to the secondary impeller with the secondary impeller;

discharging the pressurized gas directed to the secondary impeller through the outlet of the secondary impeller and into the ejector pump.

23. The method of claim 22, wherein the ejector pump is a single stage ejector pump or a multistage ejector pump.