Solar power system

Patent metadata

Field	Value
Publication number	US-9702541-B2
Application number	US-201314414851-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Jul 17, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Provided is an inexpensive and simple solar power system. A solar power system according to the present invention includes: a heat collection apparatus ( 2, 4 ); a steam turbine ( 5 ), a power generator ( 16 ); a superheated steam supply line which supplies the steam turbine with superheated steam generated by the heat collection apparatus; a water supply line which condenses the steam expelled from the steam turbine into water and supplies the condensed water to the heat collection apparatus; a heat storage device ( 8 ) which has a heat storage medium; a first line which branches from the superheated steam supply line and which supplies the heat storage device with the superheated steam flowing through the superheated steam supply line; a second line which branches from the water supply line and which supplies the heat storage device with the water flowing through the water supply line; and a third line which supplies the steam turbine with superheated steam generated by the heat storage device. The heat storage device stores the heat of the superheated steam which has flowed through the first line in the heat storage medium, and heats the water which has flowed through the second line with the heat storage medium to thereby generate the superheated steam.

First claim

The invention claimed is:

1. A solar power system comprising: a heat collection apparatus which collects sunlight to heat water; a steam turbine; a power generator which generates electric power with motive power of the steam turbine; a superheated steam supply line which supplies the steam turbine with superheated steam generated by the heat collection apparatus; a water supply line which condenses the steam expelled from the steam turbine into water and supplies the condensed water to the heat collection apparatus; a heat storage device which has a heat storage medium; a first line which branches from the superheated steam supply line and which supplies the heat storage device with the superheated steam flowing through the superheated steam supply line; a second line which branches from the water supply line and which supplies the heat storage device with the water flowing through the water supply line; and a third line which supplies the steam turbine with superheated steam generated by the heat storage device; wherein:
the heat storage device stores the heat of the superheated steam which has flowed through the first line in the heat storage medium, and heats the water which has flowed through the second line with the heat storage medium to generate superheated steam;
the heat collection apparatus includes a low temperature heat collection device which heats water to generate steam and a high temperature heat collection device which further heats the steam heated by the low temperature heat collection device to generate superheated steam;
a steam-water separation device is provided between the low temperature heat collection device and the high temperature heat collection device;
a fourth line is provided to return water separated by the steam-water separation device to the water supply line;
a fifth line is provided to supply the steam-water separation device with the steam which has flowed from the first line into the heat storage device and whose heat has been released to the heat storage medium in the heat storage device;
the solar power system further comprises a temperature detector which detects the temperature of the superheated steam flowing through the first line; a spray valve provided in the first line which adjusts the temperature of the superheated steam flowing through the first line and flowing into the heat storage device by spraying water directly to the superheated steam; and a first control device which controls action of the spray valve; and
the first control device adjusts a valve opening degree of the spray valve based on a detection signal of the temperature detector so that the temperature of the superheated steam flowing through the first line can be kept lower than a temperature which can cause deterioration of the heat storage medium.

2. A solar power system according to claim 1 , further comprising:
a water supply valve which is provided in the water supply line and which adjusts the flow rate of the water supplied to the low temperature heat collection device; a steam extraction valve which is provided in the first line and which adjusts the flow rate of the superheated steam supplied to the heat storage device; a water level detector which detects the level of the water separated by the steam-water separation device; a flow rate detector which detects the flow rate of the water supplied to the low temperature heat collection device; and a second control device which controls action of the water supply valve and action of the steam extraction valve; wherein:
the second control device adjusts a valve opening degree of the water supply valve and a valve opening degree of the steam extraction valve based on a detection signal of the water level detector and a detection signal of the flow rate detector so that the temperature of the superheated steam flowing through the fifth line can be kept higher than a coagulation point of the heat storage medium.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• SHINOZAKI Kohei
• Marumoto Takahiro
• SHIKATA Tetsuo
• Kashima Jun
• Tadakuma Satoshi

Classifications

• F28D20/028

  Control arrangements therefor · CPC title

• F01K3/06

  the engine being of extraction or non-condensing type {(F01K3/004 takes precedence)} · CPC title

• F01K3/12

  having two or more accumulators · CPC title

• F01K3/002

  Steam conversion · CPC title

• F28D2020/0047

  using molten salts or liquid metals · CPC title