Chasing the sun to power

Written by solar power

Tuesday, 07 October 2008 03:35

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In the use of solar power, geothermal power trough condenser system is by far the world's only after 20 years of commercial operation of a mature technology, its cost is far lower than the photovoltaic power generation. Its energy storage system or combustion system can achieve 24-hour operation, the cost of electricity is also very competitive. At present, Europe and the United States is building a number of improved trough solar thermal power generation system, the more superior performance. Condenser trough thermal power generation system through the parabolic trough solar concentrator mirror will be brought together in the Coke line, in-line Coke collector tube installed to absorb the sun's radiation after the focus. The tube is heated fluid, flows through the heat exchanger Steam heating water, through the use of steam power cycle to generate electricity. The device from morning to track the sun from west to east in a row running, with the collector axis parallel to the line of coke was north-south layout, which is a one-dimensional model to track the sun, easy tracking, and high optical efficiency. Condenser in the 30-80 ratio between the temperature range of up to 400 ℃.
     In the 1980s, the United States Luz in the Mojave Desert in California have built a trough 9 thermal power plant condenser (SEGS), a total installed capacity of 354 megawatts, the total amount of 1,080,000,000 kwh in electricity generation, electricity For 500,000 people. Tubular collectors working inside the media for conducting oil, heat transfer oil through the heat exchanger can produce 390 ℃ of superheated steam to drive steam turbine power generation. With the continuous development of technology, the efficiency of the system at first by 11.5% to 13.6%. Per kilowatt of installed capacity of electric energy investment has been reduced to 6000 U.S. dollars from more than 2000 U.S. dollars; electricity by 24 per cent down to 7.5 cents -8.5 cents.
     Since 1984, Luz company has developed a 14 MW, 30 MW and 80 MW a variety of systems, from solar radiation to the maximum instantaneous power efficiency of 24%, the average efficiency of up to 15%. Since the solar energy is random, in the work of the media loop in the addition of a conventional fuel (usually natural gas) boiler support for urgently needed.
     The system has the following advantages: First, install more convenient maintenance; second, multi-condenser-collector can simultaneously track, it greatly reduced the cost of tracking control; Third, the absorber tube to make the work flow of heating medium At the same time, the energy is concentrated in the process, so the overall cost of the relative minimum, maximum economic benefits, this is the first system in the world to realize the commercialization of the reason why.
     At present, the direct consequence of high temperature and high pressure water vapor absorption of a new type of pipe has been successfully developed, you can cancel the heat transfer oil circuit, thereby reducing the cost of running the system and increase the security operation.
     Trough solar thermal power generation to master advanced technology of foreign enterprises are mainly distributed in the United States, Israel and Germany. Collector tube (HCE) is the system of one of the core technology. At present, only the world of Israel's Solel and Germany's Schott and manufacturing companies. Each collector unit length of 12 meters, vertical by the 7-shaped parabolic mirror glass, horizontal 4 by the composition of the glass mirror. Glass mirror symmetrical arrangement, a total of 28. Collector components by SKAL-ET150 is located in the central part of drive to drive.
PV China Standardization Technical Committee, member of the Chinese Academy of Sciences, Institute of Electrical Engineer MA Sheng-Hung said that China's solar energy resources every year more than 1900 kwh per square meter area, the establishment of -100 MW to 30 MW thermal power station condenser trough, Prospects will be very broad. If the system can be localized in China, manufacturing, to reduce the potential cost is enormous, the system best suited to large-scale development.

Last Updated on Tuesday, 07 October 2008 03:43

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