CA1139280A - Waste gas recovery systems - Google Patents
Waste gas recovery systemsInfo
- Publication number
- CA1139280A CA1139280A CA000337149A CA337149A CA1139280A CA 1139280 A CA1139280 A CA 1139280A CA 000337149 A CA000337149 A CA 000337149A CA 337149 A CA337149 A CA 337149A CA 1139280 A CA1139280 A CA 1139280A
- Authority
- CA
- Canada
- Prior art keywords
- compressor
- inlet
- gas
- outlet
- temperature
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5846—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling by injection
Abstract
ABSTRACT OF THE DISCLOSURE
A waste gas recovery system employs a compressor which takes in waste gas from an inlet knock-out drum and passes compresses gas to a heat exchanger which cools the gas prior to passage through a further outlet knock-out drum. The compressor is driven at a speed which is selected in accordance with the sensed pressure of the incoming waste gas and a valve progressively controls the supply of gas to the compressor inlet in accordance with the sensed pressure. Liquid condensate from the knock-out drums collects in a header tank. A temperature sensing and control arrangement injects liquid from this tank at the inlet to the compressor in the event of an excessive temperature rise at the outlet of the compressor. Gas is also re-circulated from the output of the system to the compressor inlet should the injection of liquid be insufficient to reduce the temperature rise.
In the event that the pressure of the waste gas fed to the inlet of the compressor falls below a set minimum value, the control arrangement measures that the compressor runs with gas re-circulating continuosusly between the output of the system and the compressor inlet.
A waste gas recovery system employs a compressor which takes in waste gas from an inlet knock-out drum and passes compresses gas to a heat exchanger which cools the gas prior to passage through a further outlet knock-out drum. The compressor is driven at a speed which is selected in accordance with the sensed pressure of the incoming waste gas and a valve progressively controls the supply of gas to the compressor inlet in accordance with the sensed pressure. Liquid condensate from the knock-out drums collects in a header tank. A temperature sensing and control arrangement injects liquid from this tank at the inlet to the compressor in the event of an excessive temperature rise at the outlet of the compressor. Gas is also re-circulated from the output of the system to the compressor inlet should the injection of liquid be insufficient to reduce the temperature rise.
In the event that the pressure of the waste gas fed to the inlet of the compressor falls below a set minimum value, the control arrangement measures that the compressor runs with gas re-circulating continuosusly between the output of the system and the compressor inlet.
Description
~3~280 BACKGROUND TO THE INVENTION
The present invention relates in general to a waste gas recovery system.
It is well known to burn off or discharge waste gas arising in process plants used in the oil and chemical industries. Normally, the waste gas is passed to a flare which is elevated and is burnt off at the top of the flare.
Nowadays, there is a tendency to utilize recovery systems which process waste gas for utilization as a fuel. There is, however, a need for a flexible recovery system which can be easily integrated with existing plant equipment on site. The recovery system would supplement the normal flare system so that the latter would still operate in abnormal emergency conditions where there is a need to dispose of a large quantity of waste gas. The normal flare system or the recovery system would employ control means to ensure that the waste gas diverted from the flare system for recovery purposes would not be such as to cause air to be drawn into the flare system~ thereby creating a dangerous situation. Since the pressure and flow rates of the waste gas can vary over wide ranges in a typical plant, the recovery system should be adapted to cope with such expected variations. ~bove all, the systems must ensure that the waste gas recovery is achieved in a safe, reliable manner and without adversely affec-ting ms/~
~3928(~
the normal flare system. A general object of the present invention is to provide an improved form of recovery system.
SUM~ARY OF THE INVENTION
As is known, the present invention relates to a waste gas recovery system which employs a compressor which takes in the raw waste gas and passes the compressed gas to an output and, preferably, through a cooler to the output.
In accordance with the invention, parameters are sensed in the system and control functions are initiated to protect the compressor to ensure primarily that the co~pressor is .~ not starved of gas and does not operate under adverse conditions, leading to excessive temperatures.
In one aspect, the invention provides a method of control which comprises sensing the pressure of the gas fed to the inlet of the compressor, sensing the temperature of the gas at the outlet of the compressor,controlling the drive speed of the compressor in accordance with the sensed pressure and operating control means in dependence on the sensed temperature to act on -the gas at the inlet of the compressor to effect cooling of the outlet gas. The control means may comprise valve means which is operated to inject liquid acting as a coolant into the ~as entering the compressor.
Alternatively, or additionally, the con-trol means comprise valve means which is operated to pass recirculatory cooled gas from the output of the overall system back to the inlet of the compressor. It may be desirable to e~tend the control so as to comprise operating valve means to vary and control -the ii39280 main supply of waste gas to the inlet o~ the compressor in accordance with the sensed pressure.
A recovery system made in accordance with the invention comprises inlet means ~or receiving the waste gas, a S compressor connected to the lnlet means and serving to compress the waste gas,means ~or driving the compressor at a selectab~e variable speed and sensing means f'or sensing the pressure o~ the waste gas at the inlet means and ~or controlling the drive means to drive the compressor at a 0 speed commensurate,with the sensed pressure.
Pre~erab]y further means is provided for sensing the temperature of the waste gas at the outlet of the compressor and temperature control means responsive to the temperature sensing means and operable on the gas fed to the inlet o~ the compressor to reduce the temperature of the gas at the outlet. The temperature control means may constitute valve means operable to inject liquid acting as a coolant into the waste gas entering the inlet of the compressor, and/or operable to rec~-cle cooled gas from the outlet of the overall system back to the inlet of the compressor, in the event that the temperature should rise beyond one or more pre-determined values.
Further valve means can be connected between the inlet means and the compressor and the pressure sensing means 25 ~hen contrnls both the valve means and the drive means '' 11~
in accordance with the sensed pressure.
During operatiOn~the speed of the compressor is varied according to the sensed pressure and in the event that the incoming waste gas falls below a pre-determined pressure and the compressor is operating at minimum speed, the compressor can continue to run with the re-circulatory gas preferably cooled with the liquid injection.
It is preferable, also, to utilize one or more knock-out drums to remove liquid as condensate from the waste gas being processed and this liquid can be collected in a header tank and used as the coolant injected into the inlet gas of the compressor.
The invention may be understood more readily and various other features of the invention may become apparent, from consideration of the following description.
25;
~139280 BRIEF DESCRIPTION OF DRAWINGS
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing, which is a block schematic representation of a waste gas processing or recovery system made in accordance with the invention.
DESCRIPTION OF PREFE~RED EMBODIMENT
As shown in the accompanying drawing, the system consists of a nurnber of units and devices variously interconnected by pipes or conduits defining liquid and gaseous flow paths. ~ore particularly, the system employs two knock-out drums 10, 11 respectively, located at the inlet and outlet of the overall system. The drums 10, 11 are respectively associated with liquid-level sensing and control devices 12, 13. The device 12 controls an electric motor 14, which drives a pump 16, which feeds liquid condensate to a header tank 17 via a non-return valve 32. The device 13 controls a liquid control valve 30 which also supplies liquid condensate to the tank 17. The tank 17 is provided with an overflow or drain which prevents an exoessive amount of liquid accumulating in the tank 17. The gas outlet from the knock-out drum 10, toyether with flash gas which may collect in the header, tank 17, is fed via an adjustable-throttle pressure control valve 27, a strainer unit 25 and a silencer 26 to the inlet of a compressor 20. The outlet from the compressor 20 is fed through a silencer 23 and a heat exchanger 24 to the knock-out drum 11. The outlet from the drum 11 m~
1~39280 is split int~ two paths. One path passes via a non-return valve 33 to form the outlet "GAS OUT" from the system.
The other path is fed back through a temperature control valve 29 and through the strainer unit 25 and the silencer 26 to the inlet of the compressor 20.
The compressor 29 is driven by an electric motor 15, a speed control arranyement or unit 21 and gearing in a gear box 22. The control unit 21 may operate to effect electrical or mechanical speed control.
A temperature sensing and control device 18 senses the temperature prevailing at the outlet of the compressor 20 and controls the valve 29 and a further temperature control valve 28. Liquid condensate is drawn from the header tank 17 and injected into the inlet gas ~f the compressor 20 when the valve 28 is opened. In an analogous fashion, at least a proportion of the outlet gas is fed back from the outlet of the drum 11 into the inlet of the compressor 20 when the valve 29 is opened.
A pressure sensing and control device 19 senses the pressure prevailing at the outlet from the drum 10 and controls both the valve 27 and the speed control unit 21.
According the pressure prevailing, the drive speed of the compresso~ 20 is varied and the valve 27 is adjusted progressively to vary its throttle opening.
The operation of the SySteTn is as follows:
The waste gas to be processed and arising in a plant enters the drum 10 at "WASTE GAS IN" and a proportion of liquid entrained in the gas condenses in the drum 10.
ms/\
~39280 The gas then pass~s through the normally-open valve 27, through the strainer unit 25 and the silencer 26 into the inlet of the compressor 20. The gas is thence compressed and passed through the silencer 23 and through the heat exchanger 24, which cools the gas, to the drum 11. Liquid entrained in the gas again condenses in the drum 11 and the gas taken from the ~utlet of the drum 11 is passed through the non-return valve 33 and is suitable to be conveyed into a fuel gas main of the plant.
Variation in the pressure of the incoming gas fed to the compressor 20 is detected by the device 19 and variation in the temperature of the gas at the outlet of the compressor 20 is detected by the device 18. The device 19 directly controls the speed of the compressor drive and the speed of the compressor 20 is automatically varied to compensate for any change in the incoming gas pressure. In addition, the device 19 controls the throttle opening of the valve 27 in accordance with the sensed pressure. This pressure-sensitive control ensures that the compressor 20 operates within a certain speed range an'd maintains reasonably constant operating characteristics to ensure the outlet gas is kept within a desired range of pressure variation. When the compressor 20 is operating at minimum speed, a further reduction in the pressure of the incoming gas could give rise to a temperature rise at the outlet from the compressor 20. At a certain temperature, the device 18 actuates the valve 28, which then injects liquid taken from the header tank 17 into the gas passing into the compressor 20. The liquid tends ms/ r ~1392~30 to cool the gas and the device 18 may cause the valve 28 to cycle and switch on and off to restrict the temperature of the gas at the outlet of the compressor 20. In the event that the injection of fluid is not sufficientl~r effective tc~ restrict the temperature rise, the valve 29, which is set to switch at a higher temperature than the valve 28, will be opened by the device 18. Gas is now re-circulated from the drum 11 back to the compressor 20 and this gas, which is cooled by the heat exchanger 24, will assist in reducing the temperature of the gas in the compressor 20. In this event, the compressor 20 operates with gas re-circulating between the outlet and inlet and this gas, which is cooled by the heat exchancrer 24 and may be additionally cooled by liquid injection, ensures that the compressor 20 is protected.
The units and devices of the system as illustrated and described can be conveniently mounted on one or more skid structures which facilitates installation on site.
Certain of the units and devices would need to be adapted to the particular conditions and requirements prevailing.
Nevertheless, in a typical system, the compressor 20 can be an Aerzen type VRO 325L/125L, the valves 28, 29 can each be a Fisher type 657A or 657R, the devices 18, 19 can each be a Taylor Series 440, and the valve 27 can be a GEC Elliot type 7600.
ms/\,l
The present invention relates in general to a waste gas recovery system.
It is well known to burn off or discharge waste gas arising in process plants used in the oil and chemical industries. Normally, the waste gas is passed to a flare which is elevated and is burnt off at the top of the flare.
Nowadays, there is a tendency to utilize recovery systems which process waste gas for utilization as a fuel. There is, however, a need for a flexible recovery system which can be easily integrated with existing plant equipment on site. The recovery system would supplement the normal flare system so that the latter would still operate in abnormal emergency conditions where there is a need to dispose of a large quantity of waste gas. The normal flare system or the recovery system would employ control means to ensure that the waste gas diverted from the flare system for recovery purposes would not be such as to cause air to be drawn into the flare system~ thereby creating a dangerous situation. Since the pressure and flow rates of the waste gas can vary over wide ranges in a typical plant, the recovery system should be adapted to cope with such expected variations. ~bove all, the systems must ensure that the waste gas recovery is achieved in a safe, reliable manner and without adversely affec-ting ms/~
~3928(~
the normal flare system. A general object of the present invention is to provide an improved form of recovery system.
SUM~ARY OF THE INVENTION
As is known, the present invention relates to a waste gas recovery system which employs a compressor which takes in the raw waste gas and passes the compressed gas to an output and, preferably, through a cooler to the output.
In accordance with the invention, parameters are sensed in the system and control functions are initiated to protect the compressor to ensure primarily that the co~pressor is .~ not starved of gas and does not operate under adverse conditions, leading to excessive temperatures.
In one aspect, the invention provides a method of control which comprises sensing the pressure of the gas fed to the inlet of the compressor, sensing the temperature of the gas at the outlet of the compressor,controlling the drive speed of the compressor in accordance with the sensed pressure and operating control means in dependence on the sensed temperature to act on -the gas at the inlet of the compressor to effect cooling of the outlet gas. The control means may comprise valve means which is operated to inject liquid acting as a coolant into the ~as entering the compressor.
Alternatively, or additionally, the con-trol means comprise valve means which is operated to pass recirculatory cooled gas from the output of the overall system back to the inlet of the compressor. It may be desirable to e~tend the control so as to comprise operating valve means to vary and control -the ii39280 main supply of waste gas to the inlet o~ the compressor in accordance with the sensed pressure.
A recovery system made in accordance with the invention comprises inlet means ~or receiving the waste gas, a S compressor connected to the lnlet means and serving to compress the waste gas,means ~or driving the compressor at a selectab~e variable speed and sensing means f'or sensing the pressure o~ the waste gas at the inlet means and ~or controlling the drive means to drive the compressor at a 0 speed commensurate,with the sensed pressure.
Pre~erab]y further means is provided for sensing the temperature of the waste gas at the outlet of the compressor and temperature control means responsive to the temperature sensing means and operable on the gas fed to the inlet o~ the compressor to reduce the temperature of the gas at the outlet. The temperature control means may constitute valve means operable to inject liquid acting as a coolant into the waste gas entering the inlet of the compressor, and/or operable to rec~-cle cooled gas from the outlet of the overall system back to the inlet of the compressor, in the event that the temperature should rise beyond one or more pre-determined values.
Further valve means can be connected between the inlet means and the compressor and the pressure sensing means 25 ~hen contrnls both the valve means and the drive means '' 11~
in accordance with the sensed pressure.
During operatiOn~the speed of the compressor is varied according to the sensed pressure and in the event that the incoming waste gas falls below a pre-determined pressure and the compressor is operating at minimum speed, the compressor can continue to run with the re-circulatory gas preferably cooled with the liquid injection.
It is preferable, also, to utilize one or more knock-out drums to remove liquid as condensate from the waste gas being processed and this liquid can be collected in a header tank and used as the coolant injected into the inlet gas of the compressor.
The invention may be understood more readily and various other features of the invention may become apparent, from consideration of the following description.
25;
~139280 BRIEF DESCRIPTION OF DRAWINGS
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing, which is a block schematic representation of a waste gas processing or recovery system made in accordance with the invention.
DESCRIPTION OF PREFE~RED EMBODIMENT
As shown in the accompanying drawing, the system consists of a nurnber of units and devices variously interconnected by pipes or conduits defining liquid and gaseous flow paths. ~ore particularly, the system employs two knock-out drums 10, 11 respectively, located at the inlet and outlet of the overall system. The drums 10, 11 are respectively associated with liquid-level sensing and control devices 12, 13. The device 12 controls an electric motor 14, which drives a pump 16, which feeds liquid condensate to a header tank 17 via a non-return valve 32. The device 13 controls a liquid control valve 30 which also supplies liquid condensate to the tank 17. The tank 17 is provided with an overflow or drain which prevents an exoessive amount of liquid accumulating in the tank 17. The gas outlet from the knock-out drum 10, toyether with flash gas which may collect in the header, tank 17, is fed via an adjustable-throttle pressure control valve 27, a strainer unit 25 and a silencer 26 to the inlet of a compressor 20. The outlet from the compressor 20 is fed through a silencer 23 and a heat exchanger 24 to the knock-out drum 11. The outlet from the drum 11 m~
1~39280 is split int~ two paths. One path passes via a non-return valve 33 to form the outlet "GAS OUT" from the system.
The other path is fed back through a temperature control valve 29 and through the strainer unit 25 and the silencer 26 to the inlet of the compressor 20.
The compressor 29 is driven by an electric motor 15, a speed control arranyement or unit 21 and gearing in a gear box 22. The control unit 21 may operate to effect electrical or mechanical speed control.
A temperature sensing and control device 18 senses the temperature prevailing at the outlet of the compressor 20 and controls the valve 29 and a further temperature control valve 28. Liquid condensate is drawn from the header tank 17 and injected into the inlet gas ~f the compressor 20 when the valve 28 is opened. In an analogous fashion, at least a proportion of the outlet gas is fed back from the outlet of the drum 11 into the inlet of the compressor 20 when the valve 29 is opened.
A pressure sensing and control device 19 senses the pressure prevailing at the outlet from the drum 10 and controls both the valve 27 and the speed control unit 21.
According the pressure prevailing, the drive speed of the compresso~ 20 is varied and the valve 27 is adjusted progressively to vary its throttle opening.
The operation of the SySteTn is as follows:
The waste gas to be processed and arising in a plant enters the drum 10 at "WASTE GAS IN" and a proportion of liquid entrained in the gas condenses in the drum 10.
ms/\
~39280 The gas then pass~s through the normally-open valve 27, through the strainer unit 25 and the silencer 26 into the inlet of the compressor 20. The gas is thence compressed and passed through the silencer 23 and through the heat exchanger 24, which cools the gas, to the drum 11. Liquid entrained in the gas again condenses in the drum 11 and the gas taken from the ~utlet of the drum 11 is passed through the non-return valve 33 and is suitable to be conveyed into a fuel gas main of the plant.
Variation in the pressure of the incoming gas fed to the compressor 20 is detected by the device 19 and variation in the temperature of the gas at the outlet of the compressor 20 is detected by the device 18. The device 19 directly controls the speed of the compressor drive and the speed of the compressor 20 is automatically varied to compensate for any change in the incoming gas pressure. In addition, the device 19 controls the throttle opening of the valve 27 in accordance with the sensed pressure. This pressure-sensitive control ensures that the compressor 20 operates within a certain speed range an'd maintains reasonably constant operating characteristics to ensure the outlet gas is kept within a desired range of pressure variation. When the compressor 20 is operating at minimum speed, a further reduction in the pressure of the incoming gas could give rise to a temperature rise at the outlet from the compressor 20. At a certain temperature, the device 18 actuates the valve 28, which then injects liquid taken from the header tank 17 into the gas passing into the compressor 20. The liquid tends ms/ r ~1392~30 to cool the gas and the device 18 may cause the valve 28 to cycle and switch on and off to restrict the temperature of the gas at the outlet of the compressor 20. In the event that the injection of fluid is not sufficientl~r effective tc~ restrict the temperature rise, the valve 29, which is set to switch at a higher temperature than the valve 28, will be opened by the device 18. Gas is now re-circulated from the drum 11 back to the compressor 20 and this gas, which is cooled by the heat exchanger 24, will assist in reducing the temperature of the gas in the compressor 20. In this event, the compressor 20 operates with gas re-circulating between the outlet and inlet and this gas, which is cooled by the heat exchancrer 24 and may be additionally cooled by liquid injection, ensures that the compressor 20 is protected.
The units and devices of the system as illustrated and described can be conveniently mounted on one or more skid structures which facilitates installation on site.
Certain of the units and devices would need to be adapted to the particular conditions and requirements prevailing.
Nevertheless, in a typical system, the compressor 20 can be an Aerzen type VRO 325L/125L, the valves 28, 29 can each be a Fisher type 657A or 657R, the devices 18, 19 can each be a Taylor Series 440, and the valve 27 can be a GEC Elliot type 7600.
ms/\,l
Claims (20)
1. A waste gas recovery system with inlet means for receiving the waste gas, a compressor connected to the inlet means and serving to compress the waste gas means for driving the compressor at a selectable variable speed and sensing means for sensing the pressure of the waste gas at the inlet means and for controlling the drive means to drive the compressor at a speed commensurate with the sensed pressure.
2. A system according to claim 1 and further comprising sensing means for sensing the temperature at the outlet of the compressor and valve means controlled by said temperature sensing means and operable to inject liquid acting as a coolant into the waste gas entering the inlet of the compressor in the event that the sensed temperature exceeds a pre-determined value.
3. A system according to claim 1 and further comprising outlet means incorporating cooling means connected to the compressor for discharging the compressed waste gas after cooling sensing means for sensing the temperature at the outlet of the compressor and valve means controlled by the temperature sensing means and operable to re-cycle gas from the outlet means to the inlet of the compressor in the event that the sensed temperature should raise above a pre-determined value.
4. A system according to claim 1 and further comprising means for sensing the temperature of the waste gas at the outlet of the compressor and temperature control means responsive to the temperature sensing means and operable on the gas fed to the inlet of the compressor to reduce the temperature of the gas at the outlet.
5. A system according to claim 1, wherein valve means is connected between the inlet means and the compressor and the pressure sensing means controls both the valve means and the drive means in accordance with the sensed pressure.
6. A system according to claim 4, wherein the temperature control means at least includes valve means which serves to pass liquid acting as a coolant into the gas fed to the inlet of the compressor when the temperature sensing means senses an excessive temperature.
7. A system according to claim 4, wherein the temperature control means at least includes valve means which serves to pass cooled gas from outlet means connected to the outlet of the compressor back to the inlet of the compressor when the temperature sensing means senses an excessive temperature.
8. A system according to claim 4, wherein the outlet of the compressor is connected to outlet means which includes a heat exchanger which cools the waste gas for subsequent discharge.
9. A system according to claim 8, wherein the outlet means includes a knock-out drum for removing liquid as condensate from the waste gas for subsequent discharge.
10. A system according to claim 4, wherein the inlet means includes a knock-out drum for removing liquid as condensate from the waste gas received.
11. A system according to claim 6, wherein the liquid for injection into the gas fed to the inlet of the compressor is taken from a header tank which collects and stores liquid condensate removed from the waste gas.
12. A system according to claim 11, wherein gas present in the header tank is passed to the inlet of the compressor.
13. A system according to claim 7 and further comprising further valve means which is controlled by the pressure sensing means to vary and control the gas fed to the inlet of the compressor from the inlet means, with the first-mentioned valve means passing gas back from the outlet means to the inlet of the compressor at a pre-determined sensed minimal pressure.
14. A system according to claim 6, wherein tile valve means is operated to pass the liquid coolant into the inlet of the compressor in the event that the temperature sensing means senses a temperature exceeding a first pre-determined value and the system further comprises outlet means connected to the outlet of the compressor and incorporating cooling means for cooling the compressed waste gas for subsequent utilization and further valve means also controlled by the temperature sensing means and operable to re-cycle gas from the outlet means back to the inlet of the compressor in the event -that the sensed temperature exceeds a further pre-determined value greater than the first pre-determined value.
15. A system according to claim 5 and further comprising means for sensing the temperature of the waste gas at the outlet of the compressor valve means controlled by the temperature sensing means to inject liquid coolant into the inlet of the compressor in the event that the sensed temperature exceeds a first pre-determined value and further valve means also controlled by the temperature sensing means and operable to re-cycle gas from the outlet means back to the inlet of the compressor in the event that the sensed temperature exceeds a further pre-determined value greater than the first pre-determined value.
16. In a waste gas recovery system with a compressor serving to compress the waste gas; an improved method of control which comprises sensing the pressure of the gas fed to the inlet of the compressor, sensing the temperature of the gas at the outlet of the compressor, controlling the drive speed of the compressor in accordance with the sensed pressure and operating control valve means in dependence on the sensed temperature to inject fluid into the gas at the inlet of the compressor to effect cooling of the outlet gas.
17. A method according to claim 16, wherein said control means is operated to open valve means to inject liquid coolant into the inlet gas.
18. A method according to claim 17, further comprising operating a further valve means of the control means in dependence on the sensed temperature to recirculate cooled gas from the outlet to the inlet of the compressor.
19. A method according to claim 16 wherein the operation of the control means involves the successive operation of separate valve means to inject liquid coolant into the gas fed to the inlet of the compressor and to recirculate cooled gas from the outlet to the inlet of the compressor at pre-determined sensed temperature values.
20. A method according to claim 16 and further comprising operating valve means to vary and control the main supply of waste gas to the inlet of the compressor in accordance with the sensed pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/949,091 US4273514A (en) | 1978-10-06 | 1978-10-06 | Waste gas recovery systems |
| US949,091 | 1978-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1139280A true CA1139280A (en) | 1983-01-11 |
Family
ID=25488589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000337149A Expired CA1139280A (en) | 1978-10-06 | 1979-10-05 | Waste gas recovery systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4273514A (en) |
| CA (1) | CA1139280A (en) |
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| AU2009326302B2 (en) * | 2008-12-09 | 2013-07-25 | Shell Internationale Research Maatschappij B.V. | Method of operating a compressor and an apparatus therefor |
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| CN107532468B (en) | 2014-10-06 | 2021-03-19 | 通用电气石油和天然气公司 | System and method for compressing and conditioning hydrocarbon gas |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1346898A (en) * | 1916-02-07 | 1920-07-20 | Kingsbury John Mclean | Fluid-flow-control mechanism |
| US2042991A (en) * | 1934-11-26 | 1936-06-02 | Jr James C Harris | Method of and apparatus for producing vapor saturation |
| FR846907A (en) * | 1937-12-01 | 1939-09-28 | Improvement in gas and vapor compression | |
| US2645409A (en) * | 1948-05-17 | 1953-07-14 | Boeing Co | Air induction system heating in supercharged engine |
| US2876865A (en) * | 1956-11-02 | 1959-03-10 | Phillips Petroleum Co | Cooling hot gases |
| US3091097A (en) * | 1960-08-11 | 1963-05-28 | Ingersoll Rand Co | Method of removing impurities from a compressed gas |
| US3180266A (en) * | 1963-06-27 | 1965-04-27 | Ingersoll Rand Co | Hydraulic computer for pump by-pass control |
| DE2108757C3 (en) * | 1971-02-24 | 1974-01-17 | Egon Georg 8000 Muenchen Weishaar | Device for suctioning blood from a surgical wound and feeding it to a heart-lung machine |
| US3785749A (en) * | 1972-03-24 | 1974-01-15 | Phillips Petroleum Co | Control system for two-stage compressors |
| US3957395A (en) * | 1974-11-25 | 1976-05-18 | Cla-Val Co. | Method and apparatus for controlling a pump |
-
1978
- 1978-10-06 US US05/949,091 patent/US4273514A/en not_active Expired - Lifetime
-
1979
- 1979-10-05 CA CA000337149A patent/CA1139280A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4273514A (en) | 1981-06-16 |
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