Waste heat recovery apparatus
First Claim
1. A waste heat recovery apparatus which utilizes waste heat from a heat generating device, comprising:
- a Rankine cycle which includes a pump for circulating an operation fluid, a heater for heating the operation fluid by the waste heat, an expansion unit for converting energy of expansion of the heated operation fluid into mechanical energy, and a condenser for condensing and liquefying the expanded operation fluid;
a temperature detector which detects a temperature of the operation fluid flowing into the expansion unit;
an inlet-side pressure detector which detects pressure on an inlet side of the expansion unit;
an outlet-side pressure detector which detects pressure on an outlet side of the expansion unit; and
Rankine operation control means for controlling an command rotational speed of the expansion unit based on superheated degree information on the inlet side of the expansion unit and pressure information, the superheated degree information being obtained from the temperature of the operation fluid detected by the temperature detector and the inlet-side pressure detected by the inlet-side pressure detector, and the pressure information being obtained by considering the outlet-side pressure detected by the outlet-side pressure detector.
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Accused Products
Abstract
A waste heat recovery apparatus including a Rankine cycle which includes a heater for heating an operation fluid by waste heat from a heat-generating device, an expansion unit for converting energy of expansion of the operation fluid flowing out from the heater into mechanical energy, and a condenser for condensing and liquefying the expanded operation fluid, a temperature detector for detecting the temperature of the operation fluid on the inlet side of the expansion unit, a pressure detector for detecting inlet-side pressure of the expansion unit, a pressure detector for detecting outlet-side pressure of the expansion unit, and a control unit. The control unit controls a command rotational speed of the expansion unit based on superheated degree information at the inlet of the expansion unit obtained from the operation fluid temperature and the inlet-side pressure, and pressure information in which the outlet-side pressure is considered.
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Citations
21 Claims
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1. A waste heat recovery apparatus which utilizes waste heat from a heat generating device, comprising:
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a Rankine cycle which includes a pump for circulating an operation fluid, a heater for heating the operation fluid by the waste heat, an expansion unit for converting energy of expansion of the heated operation fluid into mechanical energy, and a condenser for condensing and liquefying the expanded operation fluid; a temperature detector which detects a temperature of the operation fluid flowing into the expansion unit; an inlet-side pressure detector which detects pressure on an inlet side of the expansion unit; an outlet-side pressure detector which detects pressure on an outlet side of the expansion unit; and Rankine operation control means for controlling an command rotational speed of the expansion unit based on superheated degree information on the inlet side of the expansion unit and pressure information, the superheated degree information being obtained from the temperature of the operation fluid detected by the temperature detector and the inlet-side pressure detected by the inlet-side pressure detector, and the pressure information being obtained by considering the outlet-side pressure detected by the outlet-side pressure detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A waste heat recovery apparatus comprising:
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a Rankine cycle which includes a pump for pressure-feeding a liquid phase operation fluid, a heater for transforming the liquid phase operation fluid fed from the pump into a gaseous phase operation fluid by heating with waste heat from a heat-generating device, an expansion unit for converting energy of expansion of the gaseous phase operation fluid flowing out from the heater into mechanical energy, and a condenser for condensing and liquefying the expanded gaseous phase operation fluid flowing out from the expansion unit and introducing the liquefied operation fluid into the pump; a rotary electric machine which has both functions of an electric motor and a generator, and is connected to the pump and the expansion unit through the same shaft; a control unit which controls the operation of the rotary electric machine; a bypass passage which bypasses the expansion unit; an opening/closing part which is controlled by the control unit to open and close the bypass passage; a temperature detector which detects the temperature of the gaseous phase operation fluid on an inlet side of the expansion unit; and pressure differential detecting means for detecting a pressure differential between an inlet and an outlet of the expansion unit; wherein, at the start of the Rankine cycle, the control unit controls the opening/closing part to open the bypass passage and controls the rotary electric machine to operate as the electric motor at a predetermined rotational speed, and if the temperature of the gaseous phase operation fluid detected by the temperature detector becomes equal to or higher than a predetermined temperature, the control unit controls the opening/closing part to close the bypass passage, and controls the rotary electric machine such that an operation rotational speed of the rotary electric machine increases relative to the predetermined rotational speed until a pressure differential detected by the pressure differential detector means reaches a predetermined pressure differential. - View Dependent Claims (18, 19, 20, 21)
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Specification