Focused solar power plants (CSPs) use the heat of the sun to generate steam and then drive the turbines to generate electricity. The Mitsubishi-Hitachi Power System (MHPS) is testing a new hybrid system designed to increase efficiency and reduce costs by combining a solar tower and a cryogenic Fresnel evaporator. Traditional CSP systems consist of an array of heliostats (solar reflectors) that need to chase the sun to ensure that the reflected light is always aligned in a particular direction.
MHPS is testing a hybrid centralized solar power system that includes a tower solar thermal power plant and a low-cost, low-cost Fresnel evaporator.
Compared with photovoltaic devices, although the installation of CSP systems is more complicated and expensive, it can better cope with the fluctuation of light intensity. At night or in cloudy areas, its energy production is also more stable - because heat energy can be stored and continue to generate electricity for a long time after sunset.
MHPS proposed this set of more than 10,000 square meters (107,639 square feet) of test facilities, including 150 heliostats, a regenerator built on the tower, and a low-cost Fresnel evaporator.
The evaporator collects the 70% of the total heat collected, and then heats the water through a Fresnel evaporator to produce steam at a temperature of about 300 (572).
After that, the steam is sent to the regenerator located at the top of the tower and further heated to 550 (1022) by the focusing of the heliostat. Since the steam has already been preheated, the required number of heliostat arrays is also much smaller, so the cost is much lower than with conventional CSP systems.
MHPS said that the hybrid system in this test can produce an equivalent of 300 kilowatts of electrical energy. It is located at the MHPS Yokohama plant and is manufactured under the contract of the Ministry of the Environment of Japan.
MHPS will be commissioned until March 2017 to verify that this hybrid system can effectively increase the efficiency of the current CSP system. In addition, the testing of the high-temperature thermal energy storage system will begin in October to see whether it can supply electricity stably without the aid of fossil fuel systems.
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