Parabolic trough pump applications pfd167 power tower pump applications pfd168 molten salt is pumped from the cold storage tank. This technology is a concentrating solar power csp technology, built around a proprietary central receiver tower and molten salt loop. In recent years, investigations of liquid salts in parabolic trough systems have also taken place. Molten nitrate salt, pumped from a tank at ground level, absorbs the sunlight, heating it up to 565 c. Solar energy, solar tower, dsg, multen salt, technoeconomic, sam. Bernhard hoffschmidt june 2527, 2014 font romeu, france. A california firm is converting sunlight to heat and storing it in molten salt so it can supply electricity when the wind is calm. The htf at solar two, and for salt towers since, is a 60 wt%, sodium nitrate, 40 wt% potassium nitrate blend commonly known as solar salt. Crescent dunes nevada, usa is the first operating utilityscale power tower facility in the world. The receiver contains a kind of fluid medium, be it water, air, mineral oil, liquid metal, molten salt or diluted salt.
Aurora will be able store its solar power in its molten salt storage tanks so it can sell into the market at the system. Salts have a long history in solar tower power plants of the french themis power plant 1983 24, the us molten salt electric experiment 1983 25 and solar two plant 1996 26. Nevada solar plant generates power 247 with molten salt. This development culminated in the solar two project. Department of energy to validate moltensalt power tower technology. Feasibility of a grid connected solar power tower with. References for the solar process heat models are listed separately below. Design considerations for concentrating solar power tower. It covers 450 hectares 1,112 acres and is expected to deliver 370 gwh per year. New designs of moltensalt tubularreceiver for solar power tower. This is the type of solar power that uses thousands of mirrors over hundreds of acres to reflect sunlight on a tower. The performances of these different cycles are compared comprehensively for applications in molten salt. Molten salt can be used as a storage fluid to complement the molten salt htf. Energy doe, sandia national laboratories, and industry to convert the 10mw solar.
The spt systems integrated with sco 2 brayton cycles are completely modeled by an integrative approach. The plant is a parabolic trough type with a molten salt storage for 3 hours of lowlight producing capacity. Liquid molten salt can be used as both the heat transfer fluid and storage medium. The basic principles of concentrated solar power csp systems are covered in. Recent studies have shown that, in addition to conventional fluids. During the operation of solar one, research began on the more advanced molten salt power tower design described. The plant can feed power to the grid any time of day or night. Molten salt is used in solar power tower systems because it is liquid at atmosphere pressure, it provides an efficient, lowcost medium in. Design considerations for concentrating solar power tower systems employing molten salt. Sam includes models for the following kinds of csp systems. The aim of this work was to develop an overall system design for a 300mwth solar tower powerplant based on multiple, modular, molten salt solar towers each. Nrels solar advisor model sam is employed to estimate the current and future costs for parabolic trough and molten salt power towers in the us market.
A solar power tower uses a field of tracking mirrors heliostats that redirect sunlight on to a centrally located receiver mounted on top a tower, which absorbs the concentrated sunlight. While solar one successfully demonstrated power tower technology, it also revealed the disadvantages of a watersteam system, such as the intermittent operation of the turbine due to cloud transcience and lack of effective thermal storage. Modeling molten salt power tower systems in sam 2017. The project is being cost shared by a consortium of utilities and the u. Pdf performance of molten salt solar power towers in chile. Nevadas new molten salt solar plant will produce power.
Application solution guide concentrated solar power. One power tower pilot plant to molten nitrate salt technology. Nevadas new molten salt solar plant will be run by rocket scientists from pratt and whitney. Concentrating solar power and thermal energy storage. The motivation of the present work is to continue this discussion by taking on recent technical developments in core components for molten salt technologies designed for parabolic trough solar power. Research focuses on creating heat exchanger, pump, valve, and storage tank designs that are resistant to. Ten hours is the amount of storage at the crescent dunes csp plant in nevada, which is representative of most new moltensalt power tower projects. In the solar power tower concept, a field of tracking heliostats reflect solar energy onto a single receiver at the top of the tower ugolini et al. One of the main problems of solar power tower plants with molten salt as heat transfer fluid is the reliability and lifetime estimation of central receivers. This kind of solar energy operates by using curved mirrors to focus incoming solar energy on a single tower, in the form of heat. Despite their widespread use, solar technologies suffer the limitation of most renewable technologies.
Companies such as solarreserve have championed the use of molten salt in solar thermal projects. Solar two, which is currently going through its startup phase, will generate in addition to electric power information on the design, performance, operation and maintenance of. Concentrated solar power simple explanation youtube. The present paper assesses the development of solarbased electricity generation in chile by csp, achieved by a solar power tower plant spt using molten.
Solar two was a collaborative, costshared project between 11 u. The salt is typically a blend of sodium and potassium nitrate, which are ingredients sold commercially as fertilizer. The power plant, also called the super mirror power plant, works by using 12,000 mirrors that concentrate the sunlight onto a receiver at the top of a solar tower, which then heats the molten salt. Solar power tower design basis document revision 0 prepared by alexis b. Take a peek inside nevadas new solar farm that generates power 247 with molten salt.
Integration between supercritical co2 brayton cycles and. Moltensalt power towers with 10 hours of storage were selected as the representative technology over the parabolic trough with synthetic oilheat transfer fluid for two main reasons. The solar two power tower is composed of a series of panels each made of 32 thinwalled, stainless steel tubes, through which the molten salt flows in a serpentine path. Parabolic trough, molten salt and direct steam power towers, molten salt and direct steam linear fresnel, dish stirling, a generic csp model, integrated solar combined cycle. Design considerations for concentrating solar power tower systems employing molten salt abstract the solar two project was a united states department of energy sponsored project operated from 1996 to 1999 to demonstrate the coupling of a solar power tower with a molten nitrate salt as a heat transfer media and for thermal storage. Sandia is a multiprogram laboratory operated by sandia corporation.
Molten salt solar energy thermal storage and concentrated solar power csp production by region united states europe china japan other regions. Molten salt is an ideal material for storage in solar power tower systems because it. Southern california edison leads the consortium, whose additional members include the. Future troughs are assumed to achieve higher field temperatures via the successful deployment of low meltingpoint, moltensalt heat transfer fluids by 20152020. The heat transfer media include steamwater, molten salts, or compressed air. Besides increasing efficiency, it may also shift their area of application. A california firm is converting sunlight to heat and storing it in molten salt so it.
The worlds first molten salt concentrating solar power. Molten salt makes it possible, and prices are falling fast. The concentrated energy reflected by the heliostats. Concentrated solar power plants with molten salt storage. Solar tower ppt solar energy solar power free 30day. Ouarzazate solar power station osps phase 1, also referred to as noor i csp, has an installed capacity of 160 mw. Novel molten salts thermal energy storage for concentrating solar power generation.
A solar power tower uses a field of tracking mirrors heliostats that redirect sunlight on to. Molten salt is the most common fluid medium used in concentrated solar thermal plants. Development of a hightemperature, longshafted, molten. New concentrating solar tower is worth its salt with 247 power. The solar power tower is one of the most promising technologies in. A black pyromark paint which is robust, resistant to high temperatures and thermal cycling and absorbs 95% of the incident sunlight is used to coat the external surfaces of. Solar power tower design basis document, revision 0 unt. Concentrating solar power provides utilityscale electricity and energy storage thermal energy storage options sensible heat storage molten salt, particles latent heat storage thermochemical storage cost of csp with storage is currently cheaper than photovoltaics with largescale battery storage. Molten salt power tower cost model for the system advisor.
Solar two is a utilityled project to promote the commercialization of solar power towers by retrofitting the solar one pilot plant with a molten salt system. Because the previously mentioned sources provided cost information, the primary objective of the worleyparsons study was to develop the mass and material estimates necessary for a life cycle assessment of the molten salt power tower design. Department of energy to redesign the solar one plant to include a moltensalt heattransfer system. A variety of fluids was tested to transport the suns heat, including water, air, oil, and sodium, before molten salt was selected as best. Molten salt power towers were demonstrated in the u. It was connected to the moroccan power grid on 5 february 2016. A new hot salt pump has been developed for molten salt solar power tower applications that will reduce the capital cost of the plant, eliminate many of the piping, valve and sump problems associated with the handling of molten salt, and improve the reliability of a critical part of the operating system of the plant. This report contains the design basis for a generic moltensalt solar power tower.
The paper discusses the possibilities for the use of molten salts as storage in modern csp plants. During the operation of solar one, research began on the more advanced moltensalt power tower design. Power tower systems dishengine systems others molten salt solar energy thermal storage and concentrated solar power csp breakdown data by application generate electricity industrial heating other. It circulates through the tower to collect solarthermal energy and can be easily stored in large tanks. Comparative study of two configurations of solar tower power for. In a molten salt solar power tower plant spt, th e receivers are a cr ucial part of the plant. First molten salt solar thermal power plant runs at full. Yumen 100mw molten salt tower csp project, 100, under development. A new hotsalt pump has been developed for moltensalt solar power tower applications that will reduce the capital cost of the plant, eliminate many of the piping, valve and sump problems associated with the handling of molten salt, and improve the reliability of a critical part of the operating system of the plant. Molten salt is usually made up of 60% sodium nitrate and 40% potassium nitrate which may also be referred to as saltpeter. Solar power towers seminar report, ppt, pdf for mechanical. Molten salt central receiver mscr ge renewable energy. Solar power tower solar two to encourage the development of moltensalt power towers, a consortium of utilities led by southern california edison joined with the u.
Pdf modular power tower system design mathieu farges. These pumps allow for reduced submergence levels and heat dissipation, which help maximize plant efficiency. Molten salt storage in concentrated solar power plants could meet the. Zavoico nexant san francisco, ca 94104 abstract this report contains the design basis for a generic moltensalt solar power tower.
How it works thousands of mirrors, known as heliostats, track the sun on two axes and concentrate the solar energy onto the molten salt central receiver mscr, located in the centre of the heliostat field at the top of a tower. Mike wagner describes the molten salt power tower model in sam 2017. The cheapest way to store solar energy over many hours, such as the five to seven hour evening peak demand now found in more places around the world is in thermal. They cost around the 15 20% of the total capital investme n t cost of a solar plant 1 3 and. This month, the italian utility enel unveiled archimede, the first concentrating solar power csp plant in the world to use molten salts for heat transfer and storage, and the first to be fully. Prepared by sandia national laboratories albuquerque, new mexico 87185 and livermore, california 94550. New concentrating solar tower is worth its salt with 247. Solar power tower an overview sciencedirect topics. What you should know about port augustas solar powertower. Concentrated solar power plants belong to the category of clean sources of renewable energy.