The trough type solar thermal power generation system is called a trough parabolic mirror solar thermal power generation system. The trough type parabolic concentrating collectors are arranged in series and parallel, heating the working medium, generating high temperature steam, and driving the steam turbine generator set to generate electricity.
Trench solar thermal power generation uses solar trough parabolic mirrors for solar thermal power generation. It is a multi-channel parabolic concentrating collector, arranged in series and parallel, so that it can collect higher temperature heat energy, heat the working fluid to generate steam, and drive the steam turbine generator set to generate electricity. The trough solar thermal power generation is mainly composed of four parts: a mirror field, a heat exchange system, a heat storage device and a steam turbine power generation device.
The traditional solar trough type photothermal power generation system technology (Fig. 1) is a heat carrier represented by heat transfer oil. The optical principle of parabola is used to collect solar energy, and then the solar energy is collected on the heat collecting tube, and the heat transfer oil in the heat collecting tube is collected. It will absorb the energy of the sun. The heat transfer oil will gradually heat up from 290 °C to 390 °C during the flow of the solar collector field, and then flow out of the solar collector. The heated high-temperature heat transfer oil flows into the steam generator to exchange heat with the water, and then flows back to the solar heat collecting field, while the heat exchange water becomes 375 ° C water vapor to drive the steam turbine to generate electricity; the other part of the high temperature heat transfer oil passes the heat The exchanger exchanges heat with the molten salt to return to the solar collector field, and the high-temperature molten salt after heat exchange is stored in the high-temperature molten salt tank, and is exchanged with the heat-conducting oil for nighttime steam turbine power generation when there is no sunlight at night.
The new generation of solar trough solar thermal power generation system technology (Fig. 2) is a heat carrier represented by molten salt. The optical principle of parabola is used to collect solar energy, and then the solar energy is collected on the heat collecting tube, and the melting in the heat collecting tube. The salt absorbs the energy of the sun. The molten salt is gradually heated from 290 °C to 550 °C during the flow of the solar collector, and then flows out of the solar collector. The heated high-temperature molten salt flows into the high-temperature molten salt storage tank in the heat storage system, and a part of the high-temperature molten salt flows out from the high-temperature molten salt storage tank, and the steam generator exchanges heat with the water, and then flows back to the heat storage system. In the low-temperature molten salt storage tank, the heat exchange water becomes 375 ° C water vapor to drive the steam turbine to generate electricity; the other part of the high temperature molten salt remains in the high temperature molten salt stored in the high temperature molten salt tank, and waits for no sunlight at night. The output heat exchange is used to generate electricity at night steam turbines.
As can be seen from the above two techniques, there are three main differences in the new generation of solar trough solar thermal power generation system technology.
First, the new generation technology directly uses molten salt instead of heat transfer oil as the heat carrier. The price of molten salt is generally about 1/6 of that of heat transfer oil, which greatly reduces the cost of the entire power plant, and the molten salt has no explosive danger. Compared with the heat transfer oil as the heat carrier, the fireproof and explosion-proof grade of the entire solar thermal power plant is reduced, the accident rate is reduced, and the procurement cost of the power plant valve parts is reduced.
Second, the direct use of molten salt for storage eliminates secondary heat transfer, which reduces heat transfer losses and makes the system simpler.
Third, after the molten salt is used, the operating heat exchange interval of the system is changed from 290 °C to 390 °C to 290 °C to 550 °C, so that the heat exchange steam problem is increased from 375 °C to 535 °C, so that the thermoelectric conversion efficiency of the steam turbine is greatly improved. improve.
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