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Mark Mehos - One of the best experts on this subject based on the ideXlab platform.

  • Fluidized Bed Technology for Concentrating Solar Power With Thermal Energy Storage
    Journal of Solar Energy Engineering, 2014
    Co-Authors: Greg C. Glatzmaier, Mark Mehos
    Abstract:

    A generalized modeling method is introduced and used to evaluate thermal energy storage (TES) performance. The method describes TES performance metrics in terms of three efficiencies: first-law efficiency, second-law efficiency, and storage effectiveness. By capturing all efficiencies in a systematic way, various TES technologies can be compared on an equal footing before more detailed simulations of the components and concentrating solar power (CSP) system are performed. The generalized performance metrics are applied to the particle-TES concept in a novel CSP thermal system design. The CSP thermal system has an integrated particle receiver and Fluidized-Bed heat exchanger, which uses gas/solid two-phase flow as the heat-transfer fluid, and solid particles as the heat carrier and storage medium. The TES method can potentially achieve high temperatures (>800 °C) and high thermal efficiency economically.

  • development of solid particle thermal energy storage for concentrating solar power plants that use Fluidized Bed Technology
    Energy Procedia, 2014
    Co-Authors: Greg C. Glatzmaier, Mark Mehos
    Abstract:

    Abstract The National Renewable Energy Laboratory is developing a thermal energy storage (TES) system that uses solid particles as the storage medium for a concentrating solar power plant. This paper focuses on the particle-TES performance in terms of three efficiency metrics: first-law efficiency, second-law efficiency, and storage effectiveness. The paper presents the derivation of the efficiency expression and their application in assessing the particle-TES performance and design. The particle-TES system uses low-cost stable materials that withstand high temperature at a fraction of the cost of the salt and metal containment vessels for high-temperature TES. Cost analysis indicates that particle TES costs less than $10/kWhth, which is less than half the cost of the current molten-salt-based TES and just a fraction of liquid heat transfer fluid storage at a similar high temperature of >700 °C, due to its low cost of storage medium and containment. The Fluidized-Bed TES can hold hot particles of > 800 °C with >95% exergetic efficiency, storage effectiveness, and thermal efficiency.

Greg C. Glatzmaier - One of the best experts on this subject based on the ideXlab platform.

  • Fluidized Bed Technology for Concentrating Solar Power With Thermal Energy Storage
    Journal of Solar Energy Engineering, 2014
    Co-Authors: Greg C. Glatzmaier, Mark Mehos
    Abstract:

    A generalized modeling method is introduced and used to evaluate thermal energy storage (TES) performance. The method describes TES performance metrics in terms of three efficiencies: first-law efficiency, second-law efficiency, and storage effectiveness. By capturing all efficiencies in a systematic way, various TES technologies can be compared on an equal footing before more detailed simulations of the components and concentrating solar power (CSP) system are performed. The generalized performance metrics are applied to the particle-TES concept in a novel CSP thermal system design. The CSP thermal system has an integrated particle receiver and Fluidized-Bed heat exchanger, which uses gas/solid two-phase flow as the heat-transfer fluid, and solid particles as the heat carrier and storage medium. The TES method can potentially achieve high temperatures (>800 °C) and high thermal efficiency economically.

  • development of solid particle thermal energy storage for concentrating solar power plants that use Fluidized Bed Technology
    Energy Procedia, 2014
    Co-Authors: Greg C. Glatzmaier, Mark Mehos
    Abstract:

    Abstract The National Renewable Energy Laboratory is developing a thermal energy storage (TES) system that uses solid particles as the storage medium for a concentrating solar power plant. This paper focuses on the particle-TES performance in terms of three efficiency metrics: first-law efficiency, second-law efficiency, and storage effectiveness. The paper presents the derivation of the efficiency expression and their application in assessing the particle-TES performance and design. The particle-TES system uses low-cost stable materials that withstand high temperature at a fraction of the cost of the salt and metal containment vessels for high-temperature TES. Cost analysis indicates that particle TES costs less than $10/kWhth, which is less than half the cost of the current molten-salt-based TES and just a fraction of liquid heat transfer fluid storage at a similar high temperature of >700 °C, due to its low cost of storage medium and containment. The Fluidized-Bed TES can hold hot particles of > 800 °C with >95% exergetic efficiency, storage effectiveness, and thermal efficiency.

N. Church - One of the best experts on this subject based on the ideXlab platform.

  • Silicon coatings on copper by chemical vapor deposition in Fluidized Bed reactors
    Surface and Coatings Technology, 1991
    Co-Authors: Angel Sanjurjo, Bernard J. Wood, Kai-hung Lau, Gilbert T. Tong, D.k. Choi, M.c.h. Mckubre, H.k. Song, D. Peters, N. Church
    Abstract:

    Abstract A coating technique based on (a) chemical vapor deposition, (b) Fluidized Bed Technology and (c) subhalide chemistry was used to siliconize copper. Copper samples were siliconized in silicon Beds kept at temperatures in the range 350–550 °C. Alternating current (a.c.) impedance measurements indicate that the corrosion resistance of the coated samples is significantly better than that of uncoated copper.

Wojciech Nowak - One of the best experts on this subject based on the ideXlab platform.

  • Clean coal Fluidized-Bed Technology in Poland
    Applied Energy, 2003
    Co-Authors: Wojciech Nowak
    Abstract:

    The use of a circulating Fluidized-Bed (CFB) for power generation is a rapidly growing Technology in Poland. The ability of CFBs to burn a wide variety of fuels, while meeting strict emission-control regulations, makes them an ideal choice for burning such fuels as high-sulfur coal, lignite, peat, oil, sludge, petroleum coke, gas and wastes. All these fuels are burned cleanly and economically in CFB boilers without the need for complex scrubbers, catalytic systems or other costly chemical clean-up systems. Presently 19 CFB units are in operation or under construction in Poland; utilizing a wide variety of fuels and wastes. On the basis of gathered performance data, the CFB units met and significantly satisfied all the emission levels. The paper presents the boiler design parameters, design arrangement and specific unique design features of the CFB boilers. A particular concern with the CFB boiler is the low rank brown-coal and the large furnace which had to fit into the limited space of the existing plant. Environmental performances of large-scale CFB boilers are demonstrated. Special emphasis is placed on the experience gained with the largest CFB boilers which have been in operation for more than 4 years.

  • Design and operation experience of 235 MWe CFB boilers at Turow power plant in Poland
    2000
    Co-Authors: Wojciech Nowak, Zbigniew Bis, Jerzy Laskawiec, Waclaw Krzywoszynski, R. Walkowiak
    Abstract:

    The Power Station Turow is located in Bogatynia, Poland, and has operated 10 pulverized units each 200 MW e . To meet Poland's new environmental standards, which are now compatible with EU, Turow decided to replace and upgrade six units (Nos 1 to 6) from 200 MW e to 235 MW e units and remove one unit No. 7. Units No. 8, 9 and 10 were equipped with dry sorbent desulfurization Technology. Units No. 1 and 2 have been already replaced with new clean coal circulating Fluidized Bed Technology. The Power Station Turow with six CFB units is to be the largest power station in the world based on Fluidized Bed Technology. The paper presents the boiler design parameters, design arrangement and specific unique design features. The present state of boiler performance is presented.

  • Design and operation experience of 230 MWe CFB boilers at Turow power plant in Poland
    1999
    Co-Authors: Wojciech Nowak, Zbigniew Bis, Jerzy Laskawiec, Waclaw Krzywoszynski, R. Walkowiak
    Abstract:

    The Power Station Turow is located in Bogatynia, Poland, and has operated 10 pulverized coal units each of 200 MW. The plant provided 2000 MW at the lowest cost per kWh in Poland. The Turow units have approached and in some cases already gone beyond their 25--30 year's design life. To meet Poland's new environmental standards, which are now compatible with the EU, Turow decided to replace and upgrade six units (No. 1 to 6) from 200 MW to 230 MW units and remove one unit No. 7. Units No. 8, 9 and 10 were equipped with dry sorbent desulfurization Technology. Units No. 1 and 2 have been replaced with new clean coal circulating Fluidized Bed Technology. The Power Station Turow with six CFB units is to be the largest in the world power station based on Fluidized Bed Technology.

Anuradda Ganesh - One of the best experts on this subject based on the ideXlab platform.

  • small scale ammonia production from biomass a techno enviro economic perspective
    Industrial & Engineering Chemistry Research, 2016
    Co-Authors: Pratham Arora, Andrew Hoadley, Sanjay M Mahajani, Anuradda Ganesh
    Abstract:

    Ammonia production has traditionally been based on large-scale plants. The thrust toward large-scale production to gain economic advantages has overshadowed the benefits that could be derived from small-scale production plants. Additionally, the ammonia industry consumes a major chunk of global fossil fuels, which also burdens the planet with greenhouse gases. To effectively counter these issues, this study investigates the production of ammonia from biomass. Processes based on biomass plants are usually small-scale and are limited by biomass supply. To ensure sustainable ammonia production, this study tries to highlight the techno-economic advantages that result from small-scale ammonia plants based on biomass feedstock. This paper proposes a new process that takes inputs from a relatively old, natural gas based process (leading concept ammonia) specifically designed for small-scale ammonia manufacture and couples it with a recently developed dual Fluidized Bed Technology for biomass feedstock. Two diffe...