Solar/air turbine generator system

Patent metadata

Field	Value
Publication number	US-10001112-B2
Application number	US-201514808568-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 31, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

The invention provides a solar/air turbine generator system that reduces construction and power generating costs and does not require the use of fossil fuel.
A solar/air turbine generator system comprises: a compressor for drawing in and compressing air; a solar receiver for heating the air compressed by the compressor with the use of solar heat collected by a solar collector; an air turbine for driving the compressor and a generator by receiving the compressed air heated by the solar receiver; a regenerative heat exchanger, located between the compressor and the solar receiver, for heating the air compressed by the compressor using the exhaust of the air turbine as a heating medium; and a distribution device, located between the compressor and the regenerative heat exchanger, for distributing the compressed air to the side of the regenerative heat exchanger and to a bypass side, the bypass side being the inlet side of the air turbine. The solar/air turbine generator system further includes a control device for maintaining the air temperature at the inlet of the air turbine at a constant value by adjusting the flow rate of the air turbine exhaust that flows into the regenerative heat exchanger as a heating medium.

First claim

What is claimed is:

1. A solar/air turbine generator system comprising:
a compressor for drawing in and compressing air;
a solar receiver for heating the air compressed by the compressor with the use of solar heat collected by a solar collector;
an air turbine for driving the compressor and a generator by receiving the compressed air heated by the solar receiver;
a regenerative heat exchanger, located downstream of the compressor and upstream of the solar receiver, for heating the air compressed by the compressor using the exhaust of the air turbine as a heating medium;
a distribution device, located downstream of the compressor and upstream of the regenerative heat exchanger, for distributing the air compressed by the compressor to the side of the regenerative heat exchanger and to a bypass side, the bypass side being the inlet side of the air turbine;
an air cooler for cooling the air drawn in by the compressor;
a coolant circulating pump for circulating cooling water to the air cooler;
a centrifugal chiller for cooling the cooling water;
an adjusting valve for controlling a flow rate of the cooling water flowing to the air cooler;
an air cooler outlet air temperature controller for controlling an opening degree of the adjusting valve;
a first temperature sensor for detecting an air temperature at an inlet of the air turbine;
a second temperature sensor for detecting an air temperature at an outlet of the air cooler; and
a third temperature sensor for detecting ambient temperature,
wherein the solar/air turbine generator system further includes a control device for maintaining the air temperature at the inlet of the air turbine at a constant value by adjusting the flow rate of the air turbine exhaust that flows into the regenerative heat exchanger as a heating medium, and
wherein the air cooler outlet air temperature controller reads the air turbine inlet air temperature detected by the first temperature sensor, the air cooler outlet air temperature detected by the second temperature sensor, and the ambient temperature detected by the third temperature sensor to control the air cooler outlet air temperature such that the air turbine inlet air temperature is maintained at a constant value.

2. The solar/air turbine generator system of claim 1 , further comprising:
a regenerative heat exchanger inflow system for directing the exhaust of the air turbine to the regenerative heat exchanger;
a regenerative heat exchanger bypass system for causing the exhaust of the air turbine to bypass the regenerative heat exchanger; and
a flowrate adjusting valve for adjusting the flow rate of the exhaust flowing into the regenerative heat exchanger bypass system,
wherein the control device controls the opening degree of the flowrate adjusting valve.

3. The solar/air turbine generator system of claim 1 , wherein the distribution device includes:
a three-way air flow rate switch valve for distributing the air compressed by the compressor to the side of the regenerative heat exchanger and to the bypass side, the bypass side being the inlet side of the air turbine; and
a distribution controller for controlling the opening degree of the three-way air flow rate switch valve, and
wherein the distribution controller reads the air turbine inlet air temperature detected by the first temperature sensor and the output of the generator to control the opening degree of the three-way air flow rate switch valve so that the air turbine inlet air temperature is program-controlled.

4. The solar/air turbine generator system of claim 3 , further comprising:
a solar collector including the solar receiver installed atop a tower and the solar receiver having a reflecting device;
a solar collection controller for controlling the reflection position of the reflection device of the solar collector;
a fourth temperature sensor for detecting the air temperature at the outlet of the solar collector; and
a fifth temperature sensor for detecting the air temperature of the bypass side, the bypass side being the inlet side of the air turbine,
wherein the solar collection controller reads the air turbine inlet air temperature detected by the first temperature, the solar collector outlet air temperature detected by the fourth temperature sensor, and the bypass side air temperature detected by the fifth temperature sensor to control the reflection position of the reflection device so that the heat amount to be introduced into the air turbine is increased or decreased.

5. The solar/air turbine generator system of claim 3 , further comprising:
an inverter, provided in an in-plant electric system, for converting the electric power from the in-plant electric system into variable frequency power and supplying the converted power to the generator so that the generator is used as an electric motor to drive the air turbine;
a solar collector inlet butterfly valve provided on the inlet side of the solar collector; and
a solar collector outlet butterfly valve provided on the outlet side of the solar collector,
wherein the high-temperature air sealed in the piping of the solar collector by closing the solar collector inlet butterfly valve and the solar collector outlet butterfly valve after the end of operation on a previous day is introduced into the air turbine to rotate it at a low speed, and
wherein power with a particular frequency obtained by the inverter is then supplied to the generator to drive it as an electric motor.

6. The solar/air turbine generator system of claim 4 , further comprising:
a pressure relief adjusting valve one end of which is connected to the outlet side of the solar collector and the other end of which is open to atmosphere;
a pressure relief controller for controlling the opening degree of the pressure relief adjusting valve; and
a pressure sensor for detecting the air pressure at the outlet of the solar collector,
wherein the pressure relief controller reads the solar collector outlet air pressure detected by the pressure sensor to discharge the air to atmosphere by opening the pressure relief adjusting valve when the air pressure becomes larger than a predetermined value.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Mishima Nobuyoshi
• Osada Toshiyuki
• Nagafuchi Naoyuki

Classifications

• F03D9/007

  the wind motor being combined with means for converting solar radiation into useful energy · CPC title

• F02C7/10

  by means of regenerative heat-exchangers · CPC title

• F03G6/068

  having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear · CPC title

• Y02E10/46

  Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines · CPC title

• F03G6/04 Primary

  gaseous {(F03G6/064, F03G6/068 take precedence)} · CPC title