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| Number | Title | Issue Date |
| 7210895 | Turbo compressor and method of operating the turbo compressor A turbo-compressor being driven by an electric motor has an inlet guide vane and a blow-off valve. The surge limit line of the compressor is amended depending upon seasonal changes of temperature and pressure of a working gas to be sucked into the compressor. Upon t... | 05/01/2007 |
| 7178351 | Heat exchanger optimization process and apparatus An electronic HEMD determines the optimum balance between gas cooling and heat exchanger pressure loss, for any given operating condition, and adjusts the gas flow rate through the exchanger accordingly, to yield the maximum net power savings (and thereby energy sav... | 02/20/2007 |
| 7094019 | System and method of surge limit control for turbo compressors A system and method of surge limit control for turbo compressors including a turbo compressor having an inlet and an outlet, an anti-surge valve, a variable speed drive to operate the compressor, a rotational speed transmitter, an inlet temperature transmitter, an i... | 08/22/2006 |
| 7069733 | Utilization of bogdown of single-shaft gas turbines to minimize relief flows in baseload LNG plants Gas compression system comprising a driver; a refrigerant compressor driven by the driver and having an inlet and an outlet; a relief pressure safety valve having an inlet in flow communication with the outlet of the compressor, an outlet, and a set point; and a rec... | 07/04/2006 |
| 7069728 | Multi-position BOV actuator A multi-position pressurized fluid actuator is mounted for movement in a casing. The actuator includes at least one selectively openable opening at a location corresponding to an intermediate position through which pressurized fluid can be selectively bled from the ... | 07/04/2006 |
| 7025088 | Providing an indication of the position of a valve member A method of providing an indication of the position of a valve member of a valve in a fluid path where the valve member is moveable between a fully open position in which a maximum flow of fluid past the valve member is permitted and a closed position in which fluid... | 04/11/2006 |
| 7025079 | Air bleed-off valve An automatic air bleed valve which allows air to escape from water lines. Allowing air to thus escape, prevents pump cavitation and/or air in the heater. The air bleed valve is positioned between a pump and the heater, and is higher than the heater, and no higher th... | 04/11/2006 |
| 7025557 | Secondary flow control system The present invention is a system (20) for controlling various fluid flows, e.g., secondary fluid flows including cavitating fluid flows, typically developed along the shroud line and usually in or around a leading edge (21) within a flow channel (2... | 04/11/2006 |
| 7011498 | Optimization method for power generation systems Apparatus for controlling the power output efficiency of a power generation system based on an operator input. A processor is coupled to the input means and (i) receives the generated operator command, (ii) receives a plurality of detected ambient air conditions, (i... | 03/14/2006 |
| 6907722 | Gas compressor control device and gas turbine plant control mechanism A gas compressor control device and a gas turbine plant control mechanism are disclosed. A fuel gas pressurized by a gas compressor is supplied to a gas turbine via fuel gas piping. A gas turbine control device adjusts the flow rate of the fuel gas into the gas turb... | 06/21/2005 |
| 6883316 | Control system for a turbo-charged diesel aircraft engine In the control system for a turbo-charged diesel aircraft engine, a target value for a fuel injection amount is determined by the stroke of a throttle lever. A boost compensator determines the maximum limit for the fuel injection amount in accordance with the boost ... | 04/26/2005 |
| 6551068 | Process for protecting a turbocompressor from operating in the unstable working range To protect a turbocompressor (3) with a downstream process from operation in the unstable working range, a machine controller is used, which optionally contains--besides a surge limit controller (15)--an intake pressure controller (11), an end pressure co... | 04/22/2003 |
| 6328526 | Gas turbine starting method Gas turbine starting method is improved to start operation with bleed valves being first throttled, then fully opened on the way and then fully closed at 90% speed, thereby fluid unstableness phenomenon is suppressed and starter motor power is reduced. Wh... | 12/11/2001 |
| 6206632 | Bleed tube for centrifugal pump and method for retrofitting same An air bleed tube is attached to a single-stage centrifugal pump, which has an impeller and a liquid suction tube whose inlet is at a center of the impeller. The air bleed tube is attached with its air inlet at an exposed eye of the impeller to bleed air ... | 03/27/2001 |
| 6059522 | Compressor stall diagnostics and avoidance A pressure sensor (12) is located in the compressor stage of a gas turbine engine (10) to provide a pressure signal (PR1) that shows the compressor flow characteristics. The pressure signal (PR1) is applied to a bandpass filter (16) with roll-offs above a... | 05/09/2000 |
| 5984626 | Evacuation means for pumps The present invention is for an evacuation system which preferrably in its entirety is connected to and operates at the outlet side of a pump. The evacuation system is connected to the socket 5 by the connector 9 and one of the valves 15 or 16. In the eva... | 11/16/1999 |
| 5951240 | Method and apparatus for improving antisurge control of turbocompressors by reducing control valve response time The stroking speed of an antisurge control valve is impeded by the combined damping effects of signal dead time and the inherent lag of ancillary pneumatic components within a primary control loop. Furthermore, as control valve actuator size increases, th... | 09/14/1999 |
| 5915917 | Compressor stall and surge control using airflow asymmetry measurement A technique for controlling compressor stall and surge is disclosed. In a gas turbine engine, static pressure asymmetry is sensed at a plurality of locations along the circumference of the compressor inlet. Time rate of change of the mass flow in the comp... | 06/29/1999 |
| 5765991 | Process and device for operating dynamic-type compressors with regulators with high proportional amplification A process and a device for avoiding regulator instabilities in surge limit regulators for protecting a turbocompressor from surging if a high proportional gain is selected for the surge limit regulator by a blow-off via a blow-off valve. The control of th... | 06/16/1998 |
| 5762468 | Process for protecting a turbocompressor from operation in the unstable working range by means of fittings with two different regulating speeds A process and to a device for protecting a turbocompressor from operating in the unstable working range by means of a blow-off device, wherein a control parameter is determined from measured values for the compressor flow, the compressor final pressure an... | 06/09/1998 |
| 5726891 | Surge detection system using engine signature A method of, and a system for, detecting an occurrence of a surge in a gas turbine engine. The method includes steps, executed during consecutively occurring time periods, of: obtaining filtered derivatives of first and second engine operating characteris... | 03/10/1998 |
| 5709526 | Surge recurrence prevention control system for dynamic compressors A control system prevents recurrence of surge in a dynamic compressor. An anti-surge valve bypasses flow and is operated by the control system between a low limit and a full open position. The low limit is initially established to be zero, or a fully clos... | 01/20/1998 |
| 5375412 | Rotating stall recovery In an aircraft gas turbine engine, stator vane deflection and compressor bleed are controlled to alter the compressor airflow vs. compressor pressure relationship map when stall conditions are detected based on compressor speed and compressor temperature,... | 12/27/1994 |
| 5363652 | Air/fuel ratio control device of a turbocharged engine An engine including a supercharger wherein a waste gate valve is provided in the bypass passage bypassing the exhaust turbine of the supercharger and the supercharged pressure is controlled by the waste gate valve so that when the opening of the throttle ... | 11/15/1994 |
| 5306116 | Surge control and recovery for a centrifugal compressor A method and apparatus for controlling working fluid surge in a centrifugal compressor include preventing surge by using a variable-speed prime-mover to achieve a minimum desired surge margin. Surge prevention is also accomplished by continuously modulati... | 04/26/1994 |
| 5290142 | Method of monitoring a pumping limit of a multistage turbocompressor with intermediate cooling A method of operating a multistage turbocompressor or of monitoring the pump limit thereof, whereby the pump limit function is stored in the control unit in the form Y=m.F+b and the coefficients m and b are determined by the linear relationships m=m0... | 03/01/1994 |
| 5242263 | Device for the control of anti-surge of a compressor An anti-surge valve (11) equipped with a servomotor and connected between the outlet of the compressor (12) and its inlet, the servomotor being controlled from a regulating system (13) which receives at the input a parameter (m) representing the flow of t... | 09/07/1993 |
| 5216877 | Linear actuator for a bleed valve In a control system for a turbine engine having a variable geometry air compressor, a valve arrangement responsive to a first operational pressure differential created between a discharge fluid pressure produced by the air compressor and an environmental ... | 06/08/1993 |
| 5195875 | Antisurge control system for compressors Method and apparatus for operating a compressor to avoid surge conditions. The compressor is controlled by determining a surge line for the compressor as a function of compression ratio and the flow coefficient (MÝa;RTZ)/Ps ; measuring the ... | 03/23/1993 |
| 5180278 | Surge-tolerant compression system In compression systems, a portion of the compressor outlet flow (28) is extracted and introduced through a surge nozzle (52) into a plenum (48) upstream of the compressor (14). The surge nozzle (52) is oriented so as to introduce in the fluid in the plenu... | 01/19/1993 |
| 5133327 | Air flow system having constant discharge volume An air flow system includes a supercharger, a bypass passageway connected between an intake side and a discharge side of the supercharger, a compression machine and an air bypass valve in the bypass passageway. An intake port of the compression machine is... | 07/28/1992 |
| 5005353 | Active control of unsteady motion phenomena in turbomachinery A control system actively controls at least one troublesome mode of an unsteady motion phenomenon in turbomachinery in order to enable an increase in the operating range of the turbomachinery. For example, rotor blade flutter or rotating stall may be cont... | 04/09/1991 |
| 4968215 | Device for control of a turbocompressor An anti-surge control of a turbocompressor includes a controller which controls the progressive opening or closing of a blow-off valve as a function of the working point location relative to a blow-off line defined in the characteristic field. A quick ope... | 11/06/1990 |
| 4948332 | Method of preventing surge in a turbocompressor by regulating blow-off A method for preventing surges in a turbocompressor which supplies downstream processor with a gaseous medium by regulating a blow-off valve. The compressor volumetric intake flow is continuously measured, as is the compressor outlet pressure. A first min... | 08/14/1990 |
| 4946343 | Method of regulation that prevents surge in a turbocompressor A regulating method for preventing surges in turbo-compressors, in which the compressor flow and forwarding pressure are continuously measured. The compressor operating point is defined by the compressor flow and the forwarding pressure. Surges are preven... | 08/07/1990 |
| 4944652 | Process and device for the control of turbo compressors In the surge limit control for turbo compressors the amplification factor of the control device producing the control signal for a blow-off valve is varied according to the ascending gradient of the compressor's characteristic corresponding to the respect... | 07/31/1990 |
| 4938658 | Method of reliably operating turbocompressors A method for reliably operating turbocompressors in which flow and forwarding pressure defining the operating point of a compressor are continuously measured. At least one blow-off valve or blow-around valve is opened by a blow-off regulating system to pr... | 07/03/1990 |
| 4936740 | Method of protecting a turbocompressor from surging by blowing off through a blow-off valve and device for carrying out the method An arrangement for protecting a turbocompressor against surges by blowing off through a blow-off valve, in which at least the flow-through of the compressor and the compressor outlet pressure are measured. A regulating parameter is determined from the mea... | 06/26/1990 |
| 4936741 | Method of regulation that prevents surge in a turbocompressor by initiating blow-off when necessary A regulating method for preventing surges in a turbocompressor by initiating blow-off when necessary during operation. Flow to the turbocompressor and the compressor outlet pressure are measured continuously, and a first regulating difference is calculate... | 06/26/1990 |
| 4921399 | Gas pipeline temperature control In a compressor station for boosting the pressure of gas stream being transported in a pipeline wherein the act of recompressing the gas stream to a desired pressure results in a gas temperature sufficiently high to stimulate cracking activity in the pipe... | 05/01/1990 |
