Solar Thermal Electric Power Generation System, Heating Medium Supply System, and Temperature Fluctuation Suppressing Device

Abstract

A temperature fluctuation suppressing device for a heating medium is provided which is capable of sufficiently suppressing temperature fluctuations of the heating medium at the time of supplying collected solar heat for steam generation, by suppressing the temperature fluctuation even if the temperature of the heating medium inevitably fluctuates with time. The temperature fluctuation suppressing device includes a heating medium mixer (10) provided on a heating medium supply passage (6) configured to supply a liquid heating medium to a heat exchanging device, the heating medium mixer (10) including: a heating medium passage forming member (29) having plural heating medium passages (30); an inlet member (91) allowing the heating medium to flow into the heating medium passage forming member (29) from the heating medium supply passage (6); and an outlet member (93) allowing the heating medium to flow out of the heating medium passage forming member (29) to the heating medium supply passage (6), the outlet member (93) being provided separately from the inlet member (91), whereby the heating medium continuously flowing into the heating medium passage forming member (29) through the inlet member (91) passes through the plural heating medium passages with time-lags to form respective streams, which are then joined together before flowing out through the outlet member (93).

Description

TECHNICAL FIELD [0001] The present invention relates to a solar thermal electric power generation system, a heating medium supply system, and a temperature fluctuation suppressing device. More specifically, the present invention relates to: a solar thermal electric power generation system configured to generate steam by means of a heating medium heated by solar heat and drive a steam turbine by means of steam thus generated to generate electricity; a heating medium supply system configured to supply the heating medium heated by solar radiation; and a temperature fluctuation suppressing device for suppressing temperature fluctuation of the heating medium. BACKGROUND ART [0002] A conventional solar thermal electric power generation system 101 shown in FIG. 25 has a configuration wherein: sunlight is collected by means of a concentrating type heat collecting unit (hereinafter will be referred to as “heat collecting unit” simply) 102; a heating medium absorbs collected sunlight as therm...

AI Technical Summary

Problems solved by technology

Actually, however, limitations on the system investment cost and running cost limit the heat storage capacity to about 4 to 6 hours in terms of electric power generating duration and, therefore, electric power generation cannot be continued all day long.

Regardless of whether the conventional solar thermal electric power generation system or the integrated solar combined cycle electric power generation system is used, there exists an unavoidable problem.

This problem is associated with the condition of solar radiation onto the surface of the Earth incidentally changing (with time) during daytime.

As a result, the condition of generated steam (including temperature, pressure, dryness and the like) to be supplied to the steam turbine always fluctuates, which causes the generated electricity to fluctuate.

If vigorous fluctuation occurs in the condition of steam, the waste heat recovery boiler or the steam turbine might be damaged thereby.

With the two systems disclosed in patent documents 1 and 2 for example, the condition of steam (including temperature, pressure, dryness and the like) generated in a heat absorbing tube associated with the heat collecting unit fluctuates, thus causing steam to lose heat while being fed from the heat collecting unit to the steam turbine.

That is, when the sunshine condition suddenly fluctuates largely or frequently, the condition of steam generated in the heat collecting unit fluctuates likewise, which makes it difficult for the whole of the integrated solar combined cycle electric power generation system to serve continuously for stable and safe operation.

When the aforementioned reflector is bent by wind incidentally, sunlight cannot be sufficiently concentrated on the aforementioned heat absorbing tube.

This also causes temperature fluctuations of the heating medium or the like.

Since such fluctuations possibly occur at short intervals, the aforementioned heat storage system cannot be utilized to suppress effectively the temperature fluctuations of the heating medium or the like.

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