초록 ▼

A waste heat power generator (G1, G2) that includes an evaporator (1) to produce steam of a working medium, a power-generating device to generate electric power while expanding the steam, a condenser (3) to condense the steam which has passed through the power-generating device (2), and a pump (5) t

A waste heat power generator (G1, G2) that includes an evaporator (1) to produce steam of a working medium, a power-generating device to generate electric power while expanding the steam, a condenser (3) to condense the steam which has passed through the power-generating device (2), and a pump (5) to send the condensed working medium to the evaporator (1). The waste heat power generator (G1, G2) may further include a valve device (6) to selectively supply a cooling medium used to cool the power-generating device (2) to the power-generating device (2), and a controller (7) to control the valve device (6) based on the temperature of the power-generating device (2).

대표청구항 ▼

1. A waste heat power generator comprising: an evaporator configured to produce steam of a working medium;an expansion turbine generator coupled to the evaporator and including an impeller, a rotary shaft supported by bearings, and a generator, a temperature sensor being provided therewith, and the

1. A waste heat power generator comprising: an evaporator configured to produce steam of a working medium;an expansion turbine generator coupled to the evaporator and including an impeller, a rotary shaft supported by bearings, and a generator, a temperature sensor being provided therewith, and the steam of the working medium being input thereinto through a supply line between the evaporator and the expansion turbine generator;a pipe different from the supply line between the evaporator and the expansion turbine generator, the pipe leading cooling medium to the expansion turbine generator;a valve coupled to the expansion turbine generator through the pipe; anda controller coupled to the valve and the temperature sensor to control supplying the cooling medium to the expansion turbine generator based on temperature of the expansion turbine generator,wherein the controller controls the valve so that the steam of the working medium from the evaporator is prevented from being liquefied inside the expansion turbine generator. 2. The waste heat power generator according to claim 1, wherein the controller controls the valve based on the temperature and pressure of the expansion turbine generator. 3. The waste heat power generator according to claim 2, wherein the controller is configured to control the valve so that: when the temperature of the expansion turbine generator is equal to or greater than a temperature indicated by a predetermined open line, which is set as a curve indicating a relationship between a temperature and a pressure at which insufficient cooling to the expansion turbine generator is not caused, and the pressure of the expansion turbine generator is equal to or less than a pressure indicated by the open line, the valve is opened; andwhen the temperature of the expansion turbine generator is equal to or less than a temperature indicated by a predetermined close line, which is set as a curve indicating a relationship between a temperature and a pressure at which liquefaction of the working medium is not caused, the close line being set between the open line and a saturation property curve showing a relationship between a temperature and a pressure in a state where an amount of the steam of the working medium to liquefy and an amount of the liquefied working medium to evaporate balance with each other, and the pressure of the expansion turbine generator is equal to or greater than a pressure indicated by the close line, the valve is closed. 4. The waste heat power generator according to claim 1, further comprising a first pressure sensor that detects a pressure of the steam supplied to the expansion turbine generator and a second pressure sensor that detects a pressure of the steam released from the expansion turbine generator, wherein the controller controls the valve based on the temperature thereof and on intermediate pressure between pressure of the steam of the working medium supplied to the expansion turbine generator and pressure of steam released from the expansion turbine generator. 5. The waste heat power generator according to claim 1, wherein the controller controls the valve based on information indicating a saturation property of the working medium. 6. The waste heat power generator according to claim 1, further comprising a condenser coupled between the power generator and the evaporator to receive coolant, which is used to cool the steam of the working medium from the expansion turbine generator, and to condense the working medium from the expansion turbine generator, wherein the cooling medium is part of the coolant. 7. The waste heat power generator according to claim 1, further comprising a condenser coupled between the expansion turbine generator and the evaporator to condense the working medium from the expansion turbine generator, wherein the cooling medium is part of a condensed working medium from the condenser. 8. The waste heat power generator according to claim 7, wherein the cooling medium from the condenser is input to the condenser after passing through the expansion turbine generator and cooling the expansion turbine generator. 9. The waste heat power generator according to claim 1, wherein the controller is configured to control the valve so that: when the temperature of the expansion turbine generator is equal to or greater than a predetermined open line, which is set as a straight line indicating a temperature at which insufficient cooling to the power generator is not caused, the valve is opened; andwhen the temperature of the expansion turbine generator is equal to or less than a predetermined close line, which is set as a straight line indicating a temperature at which liquefaction of the working medium is not caused, the temperature of the close line being less than the temperature indicated by the open line, the valve is closed.