CA1182763A - Vapour recovery unit - Google Patents
Vapour recovery unitInfo
- Publication number
- CA1182763A CA1182763A CA000406925A CA406925A CA1182763A CA 1182763 A CA1182763 A CA 1182763A CA 000406925 A CA000406925 A CA 000406925A CA 406925 A CA406925 A CA 406925A CA 1182763 A CA1182763 A CA 1182763A
- Authority
- CA
- Canada
- Prior art keywords
- gas
- liquid
- tank
- inlet duct
- drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000011084 recovery Methods 0.000 title abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 238000007599 discharging Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A gas recovery unit includes a spherical pressure accumu-lating drum into which liquid and gas are introduced via a bottom inlet cylinder. The liquid is recirculated from the bottom of the drum through a pump, while the gas rises to the top of the drum for discharge through a top gas outlet when the pressure in the tank has risen sufficiently to effect such discharge. The re-circulated liquid passes through a venturi, which is connected to a gas inlet duct for drawing gas into the liquid.
A gas recovery unit includes a spherical pressure accumu-lating drum into which liquid and gas are introduced via a bottom inlet cylinder. The liquid is recirculated from the bottom of the drum through a pump, while the gas rises to the top of the drum for discharge through a top gas outlet when the pressure in the tank has risen sufficiently to effect such discharge. The re-circulated liquid passes through a venturi, which is connected to a gas inlet duct for drawing gas into the liquid.
Description
~27 Ei~
This invention relates to a gas recovery uni-t, and in particuLar to a unit for recovering gas under low pressure from oil production tanks.
The gas which accumulates in tanks used to separate oil from water is us~lally vented to the atmosphere. The object of th~
present in~ention is to provlde a unit ~or recovering such gas.
Gas liquid separators o~ generally the type proposed herein are disclosed in U~S. Patents Nos. 3,481,113 and 3,616,599, issued to G.E. Burnham, Sr. on December 2, 1969 and November 2, 1971, respecti~ely. While the patented apparatuses employ some of the same principles as the present invention, they are somewhat complicated, and are not suitable for performing the method described herein.
Accordingly, the present invention provides a unit Eor recovering gas comprising gas pressure accumulator tank means;
inlet duct means for introducing liquid into the bottom of said tank means; gas outlet means for discharging gas ~rom the top of said tank means; liquid outlet means for discharging liquid ~rom the bottom of said tank means; pump means interconnnecting said liquid outlet means and said inlet duct means for circulating liquid through said tank means; suction means in said inlet duct means;
and gas inlet means in said inlet duct means for introducing gas into said suction means whereby the gas is mixed with the liquid, and the gas and liquid are pumped into the tank means, the gas remaining in the tank means until the pressure thereof results in gas flow from said tank means, while the liquid continuously circulates through said tank means, liquid outlet means, pump means and inlet duct means.
The invention will now be described in greater detail with re~erence to -the accompanying drawing~ which illus-trates a preferred embodiment o~ the inYention, and wherein:
Figure 1 is a schematic, partly sectioned side elevation of a gas recovery unit in accordance with the present invention; and Figure 2 is a longitudinal sectional view of a venturi used ln the unit of Fig. 1.
~7ith reference to the drawing, the gas recovery unit of -the present invention includes skids 1 (one shown) for carrying the remainder of unit. The main elements mounted on the skids 1 are a tank defined by a spherical pressure accumulator drum 2 with an inlet cylinder 3 in the bottom thereof, a pump motor ~ for driving a pump 5 and a venturi generally indicated at 6.
A liquid - in this case water or glycol ~ is pumped into the drum 2 using the motor 4 and the pump 5. The motor 4 is connected to the pump 5 by a drive shaft 7 and a coupler 8. ~he liquid passes through the venturi 6 and an inlet duct 9, entering the cylinder 3 tangentially near the bottom thereof. Thus, a spinning motion is imparted to the liquid in the cylinder 3 to facilitate the separation of gas therefrom. The liquid rises in the cylinder 3 and overflows into the drum 2, normally remaining at level 10 (Fig. 1). The liquid level in the drum 2 can be observed through a window 11 in one side of the drum. The upper level of the liquid in the drum 2 is limited by an overflow duct 12 in the side of the drum above the window 11.
Any gas contained in the liquid entering the drum 2 rises in the drum. Liquid is prevented $rom rising with the gas by a pair of horizontal baffle plates 13 and 14, and by an annular baffle plate 15. Mormally, any liquid entrained in the gas condenses on the baffles 13, 14 and 15, and falls bac]c to the bot-tom of the drum 2.
Liquid in the bo-ttom of the drum 2 is recirculated throu~h -- 2 ~-~8~
the pump 5 via an outlet duct 16. Gas is introduced into the venturi 6 -through a gas inlet duct 17. A vent 18 con-taining ~
one-way check valve 19 is provided in the inlet duct 17 for ven-ting the duct 17 to the atmosphere i~ the pressure rises above a pre-determined level. A check valve 20 in the duc-t 17 downstream (in the direction oE normal gas flow) of the vent 18 permits the one-way flow of gas into the unit.
The venturi 6 (Fig. 2) includes a tee 21 for connecting the venturi to the pump 5, the liquid inlet duct 9 and the gas inlet duct 17. A short inlet nozzle 22 is provided in the end of inlet duct 23 from the pump. The nozzle 22 extends into the top arm 24 of the tee 21 beyond the vertical arm 25 thereof. The inlet nozzle 22 is generally conical with a slightly arcuate central passage 26. Liquid passing through the noæzle 22 is discharged into the inlet passage 27 of an outlet nozzle 28. The nozzle 28 is mounted in the inlet duct 17 for carrying fluid into the cylinder 3. The outlet nozzle 28 includes the steeply converging inlet passage 27, folIowed by a short, essentially cylindrical central passage 29 and an elongated conical diffuser or outlet passage 30. Liquid being pumped through the venturi 6 draws gas into the inlet duct 9 from the duct 17.
Gas entering the drum 2 with the liquid is separated and, when the pressure of the gas has risen sufficiently, the gas is discharged through an outlet duct 31. A gas return duc-t 32 extends between the outlet duct 31 and the gas inlet duct 17. A demand gas valve 33 in the duct 32 controls the vacuum in the gas inlet duct 17. For example the vacuum in the duct 17 drops below a pre-determined level, the valve 33 opens to admit additional gas -to the duct 17 to return the vacuum to such predetermined level. Of 3; course, such valve and return duct are provided only in cases where a vacuum could be damaging to the remainder of the unit.
In operation, the liquid is pumped into the inlet cylinder 3 and the drum 2 throuyh the inlet duct 9 creating a vacuum in the gas inlet duct 17. The gas is drawn into the liquid and en-ters the cylinder 3 and the drum 2 with the liquid. ~,~hen the liquid reaches the top of the cylinder 3, separation of the gas and l quid has been completed. The liquid is recirculated, and the gas rises to the top of the drum 2. As gas accumulates in the drum 2, the pressure in the drum increases which results in increased suction on the pump to increase the pump drive. When the unit is operating at maximum capacity, the suction pressure on the pump substantially equals the pump discharge pressure. Thus, there is very little pressure differential across the pump.
Thus, there has been described a relatively simple gas recovery unit which can be used with advantage to recover gas ~rom oil production tanks.
This invention relates to a gas recovery uni-t, and in particuLar to a unit for recovering gas under low pressure from oil production tanks.
The gas which accumulates in tanks used to separate oil from water is us~lally vented to the atmosphere. The object of th~
present in~ention is to provlde a unit ~or recovering such gas.
Gas liquid separators o~ generally the type proposed herein are disclosed in U~S. Patents Nos. 3,481,113 and 3,616,599, issued to G.E. Burnham, Sr. on December 2, 1969 and November 2, 1971, respecti~ely. While the patented apparatuses employ some of the same principles as the present invention, they are somewhat complicated, and are not suitable for performing the method described herein.
Accordingly, the present invention provides a unit Eor recovering gas comprising gas pressure accumulator tank means;
inlet duct means for introducing liquid into the bottom of said tank means; gas outlet means for discharging gas ~rom the top of said tank means; liquid outlet means for discharging liquid ~rom the bottom of said tank means; pump means interconnnecting said liquid outlet means and said inlet duct means for circulating liquid through said tank means; suction means in said inlet duct means;
and gas inlet means in said inlet duct means for introducing gas into said suction means whereby the gas is mixed with the liquid, and the gas and liquid are pumped into the tank means, the gas remaining in the tank means until the pressure thereof results in gas flow from said tank means, while the liquid continuously circulates through said tank means, liquid outlet means, pump means and inlet duct means.
The invention will now be described in greater detail with re~erence to -the accompanying drawing~ which illus-trates a preferred embodiment o~ the inYention, and wherein:
Figure 1 is a schematic, partly sectioned side elevation of a gas recovery unit in accordance with the present invention; and Figure 2 is a longitudinal sectional view of a venturi used ln the unit of Fig. 1.
~7ith reference to the drawing, the gas recovery unit of -the present invention includes skids 1 (one shown) for carrying the remainder of unit. The main elements mounted on the skids 1 are a tank defined by a spherical pressure accumulator drum 2 with an inlet cylinder 3 in the bottom thereof, a pump motor ~ for driving a pump 5 and a venturi generally indicated at 6.
A liquid - in this case water or glycol ~ is pumped into the drum 2 using the motor 4 and the pump 5. The motor 4 is connected to the pump 5 by a drive shaft 7 and a coupler 8. ~he liquid passes through the venturi 6 and an inlet duct 9, entering the cylinder 3 tangentially near the bottom thereof. Thus, a spinning motion is imparted to the liquid in the cylinder 3 to facilitate the separation of gas therefrom. The liquid rises in the cylinder 3 and overflows into the drum 2, normally remaining at level 10 (Fig. 1). The liquid level in the drum 2 can be observed through a window 11 in one side of the drum. The upper level of the liquid in the drum 2 is limited by an overflow duct 12 in the side of the drum above the window 11.
Any gas contained in the liquid entering the drum 2 rises in the drum. Liquid is prevented $rom rising with the gas by a pair of horizontal baffle plates 13 and 14, and by an annular baffle plate 15. Mormally, any liquid entrained in the gas condenses on the baffles 13, 14 and 15, and falls bac]c to the bot-tom of the drum 2.
Liquid in the bo-ttom of the drum 2 is recirculated throu~h -- 2 ~-~8~
the pump 5 via an outlet duct 16. Gas is introduced into the venturi 6 -through a gas inlet duct 17. A vent 18 con-taining ~
one-way check valve 19 is provided in the inlet duct 17 for ven-ting the duct 17 to the atmosphere i~ the pressure rises above a pre-determined level. A check valve 20 in the duc-t 17 downstream (in the direction oE normal gas flow) of the vent 18 permits the one-way flow of gas into the unit.
The venturi 6 (Fig. 2) includes a tee 21 for connecting the venturi to the pump 5, the liquid inlet duct 9 and the gas inlet duct 17. A short inlet nozzle 22 is provided in the end of inlet duct 23 from the pump. The nozzle 22 extends into the top arm 24 of the tee 21 beyond the vertical arm 25 thereof. The inlet nozzle 22 is generally conical with a slightly arcuate central passage 26. Liquid passing through the noæzle 22 is discharged into the inlet passage 27 of an outlet nozzle 28. The nozzle 28 is mounted in the inlet duct 17 for carrying fluid into the cylinder 3. The outlet nozzle 28 includes the steeply converging inlet passage 27, folIowed by a short, essentially cylindrical central passage 29 and an elongated conical diffuser or outlet passage 30. Liquid being pumped through the venturi 6 draws gas into the inlet duct 9 from the duct 17.
Gas entering the drum 2 with the liquid is separated and, when the pressure of the gas has risen sufficiently, the gas is discharged through an outlet duct 31. A gas return duc-t 32 extends between the outlet duct 31 and the gas inlet duct 17. A demand gas valve 33 in the duct 32 controls the vacuum in the gas inlet duct 17. For example the vacuum in the duct 17 drops below a pre-determined level, the valve 33 opens to admit additional gas -to the duct 17 to return the vacuum to such predetermined level. Of 3; course, such valve and return duct are provided only in cases where a vacuum could be damaging to the remainder of the unit.
In operation, the liquid is pumped into the inlet cylinder 3 and the drum 2 throuyh the inlet duct 9 creating a vacuum in the gas inlet duct 17. The gas is drawn into the liquid and en-ters the cylinder 3 and the drum 2 with the liquid. ~,~hen the liquid reaches the top of the cylinder 3, separation of the gas and l quid has been completed. The liquid is recirculated, and the gas rises to the top of the drum 2. As gas accumulates in the drum 2, the pressure in the drum increases which results in increased suction on the pump to increase the pump drive. When the unit is operating at maximum capacity, the suction pressure on the pump substantially equals the pump discharge pressure. Thus, there is very little pressure differential across the pump.
Thus, there has been described a relatively simple gas recovery unit which can be used with advantage to recover gas ~rom oil production tanks.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A unit for recovering gas comprising gas pressure accumulator tank means; inlet duct means for introducing liquid into the bottom of said tank means; gas outlet means for discharging gas from the top of said tank means; liquid outlet means for dis-charging liquid from the bottom of said tank means; pump means interconnecting said liquid outlet means and said inlet duct means for circulating liquid through said tank means; suction means in said inlet duct means; and gas inlet means in said inlet duct means for introducing gas into said suction means whereby the gas is mixed with the liquid, and the gas and liquid are pumped into the tank means, the gas remaining in the tank means until the pressure thereof results in gas flow from said tank means, while the liquid continuously circulates through said tank means, liquid outlet means, pump means and inlet duct means.
2. A unit according to claim 1, wherein said pressure accumulator tank means is a spherical drum, the liquid normally occupying the bottom portion only of the drum.
3. A unit according to claim 2, including baffle means in said drum for preventing the escape of liquid from the drum with the gas.
4. A unit according to claim 1, 2 or 3, including inlet cylinder means in the bottom of said tank means for receiving the liquid and gas from the inlet duct means, facilitating separation of the gas from the liquid.
5. A unit according to claim 1, 2 or 3, wherein said suction means is a venturi for receiving liquid from said pump means and creating a vacuum in said gas inlet duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000406925A CA1182763A (en) | 1982-07-08 | 1982-07-08 | Vapour recovery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000406925A CA1182763A (en) | 1982-07-08 | 1982-07-08 | Vapour recovery unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1182763A true CA1182763A (en) | 1985-02-19 |
Family
ID=4123179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000406925A Expired CA1182763A (en) | 1982-07-08 | 1982-07-08 | Vapour recovery unit |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1182763A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2758144B1 (en) * | 2011-09-23 | 2017-03-01 | Sulzer Chemtech AG | Spherical separation device and method for separation |
-
1982
- 1982-07-08 CA CA000406925A patent/CA1182763A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2758144B1 (en) * | 2011-09-23 | 2017-03-01 | Sulzer Chemtech AG | Spherical separation device and method for separation |
| US10814252B2 (en) | 2011-09-23 | 2020-10-27 | Sulzer Management Ag | Spherical separation device and method for separation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |