Waste heat recovery device
First Claim
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1. A waste heat recovery device including a gas compressor which compresses a gas, and a turbine driven by an exhaust gas, comprising:
- an alternating current generator operably connected to the turbine;
an electric motor operably connected to drive the compressor; and
a control device operably connected to the electric motor,wherein the control device comprises;
a rectifier operably connected to the output of the alternating current generator,a DC smoothing circuit operably connected to the output of the rectifier,an inverter arranged to drive the electric motor,a direct current bus operatively connected to transfer electric power from the alternating current generator to the electric motor,a rotation speed detector operably connected to the turbine and the alternating current generator, wherein the rotation speed detector is arranged to detect rotation speed of the turbine and the alternating current generator,a voltage detector, the voltage detector operatively arranged to detect a voltage of the current bus,a rotation speed command unit operably connected to the rotation speed detector and the inverter, the rotation speed command unit arranged to output a rotation speed command value to the inverter in response to the rotation speed of the alternating current generator, the inverter being arranged to drive the electric motor at a variable speed in accordance with the rotation speed command value from the rotation speed command unit.
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Abstract
There is disclosed a waste heat recovery device including a turbine 1 driven by an exhaust gas and a compressor 8 which compresses a gas, comprising: a generator 2 which generates electric power by rotation of the turbine 1; an electric motor 7 which rotationally drives the compressor 8; and a control device 17 which drives the electric motor 7 by using the electric power generated by the generator 2 as a power source.
38 Citations
6 Claims
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1. A waste heat recovery device including a gas compressor which compresses a gas, and a turbine driven by an exhaust gas, comprising:
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an alternating current generator operably connected to the turbine; an electric motor operably connected to drive the compressor; and a control device operably connected to the electric motor, wherein the control device comprises; a rectifier operably connected to the output of the alternating current generator, a DC smoothing circuit operably connected to the output of the rectifier, an inverter arranged to drive the electric motor, a direct current bus operatively connected to transfer electric power from the alternating current generator to the electric motor, a rotation speed detector operably connected to the turbine and the alternating current generator, wherein the rotation speed detector is arranged to detect rotation speed of the turbine and the alternating current generator, a voltage detector, the voltage detector operatively arranged to detect a voltage of the current bus, a rotation speed command unit operably connected to the rotation speed detector and the inverter, the rotation speed command unit arranged to output a rotation speed command value to the inverter in response to the rotation speed of the alternating current generator, the inverter being arranged to drive the electric motor at a variable speed in accordance with the rotation speed command value from the rotation speed command unit. - View Dependent Claims (3, 5)
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2. A waste heat recovery device including a gas compressor which compresses a gas, and a turbine driven by an exhaust gas, comprising:
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an alternating current generator operably connected to the turbine; an electric motor operably connected to drive the compressor; and a control device operably connected to the electric motor, wherein the control device comprises; a rectifier operably connected to the output of the alternating current generator, a DC smoothing circuit operably connected to the output of the rectifier, an inverter arranged to drive the electric motor, a direct current bus operatively connected to transfer electric power from the alternating current generator to the electric motor, a rotation speed detector operably connected to the turbine and the alternating current generator, wherein the rotation speed detector is arranged to detect rotation speed of the turbine and the alternating current generator, a voltage detector, the voltage detector being arranged to detect a voltage of the current bus, a rotation speed command unit operably connected to the rotation speed detector and the inverter, the rotation speed command unit arranged to output a rotation speed command value to the inverter in response to the rotation speed of the alternating current generator, the inverter being arranged to drive the electric motor at a variable speed in accordance with the rotation speed command value from the rotation speed command unit; and a direct current power source arranged to provide electric current to the direct current bus via a diode, wherein the diode has a cathode side and an anode side, wherein either the anode side of the diode is connected to a positive side of the direct current power source and the cathode side of the diode is connected to a positive side of the direct current bus, or the cathode side of the diode is connected to a negative side of the direct current power source and the anode side of the diode is connected to a negative side of the direct current bus. - View Dependent Claims (4, 6)
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Specification