Hybrid Power Cycle Research Articles

Optimization of biomass fuelled systems for distributed power generation using Particle Swarm Optimization

With sufficient territory and abundant biomass resources Spain appears to have suitable conditions to develop biomass utilization technologies. As an important decentralized power technology, biomass gasification and power generation has a potential market in making use of biomass wastes. This paper addresses biomass fuelled generation of electricity in the specific aspect of finding the best location and the supply area of the electric generation plant for three alternative technologies (gas motor, gas turbine and fuel cell-microturbine hybrid power cycle), taking into account the variables involved in the problem, such as the local distribution of biomass resources, transportation costs, distance to existing electric lines, etc. For each technology, not only optimal location and supply area of the biomass plant, but also net present value and generated electric power are determined by an own binary variant of Particle Swarm Optimization (PSO). According to the values derived from the optimization algorithm, the most profitable technology can be chosen. Computer simulations show the good performance of the proposed binary PSO algorithm to optimize biomass fuelled systems for distributed power generation.

OS4-6 排ガス駆動アンモニア水混合媒体発電・冷凍ハイブリッドサイクルの特性(OS4 省エネルギー・小型分散電源・コジェネ技術,循環型社会における動力エネルギー技術)

OS4-6 排ガス駆動アンモニア水混合媒体発電・冷凍ハイブリッドサイクルの特性(OS4 省エネルギー・小型分散電源・コジェネ技術,循環型社会における動力エネルギー技術)

Optimal Design and Operation of a SOFC-GTCC Hybrid Cycle Power Plant System

高温で動作する固体酸化物型燃料電池（SOFC）は，ガスタービンやガスエンジンと組み合わせることで，より高効率な複合発電システムを実現することできる．本研究では，SOFCとガスタービンコンバインドサイクル（GTCC）を組み合わせた100 MW級の加圧型トッピング方式の複合発電システムの物理モデルを構築し，装置に課せられた運用上の制約条件のもとで，発電効率やライフサイクルコストを最適にする設計変数，操作変数をモデルにより求めた．その結果，SOFCとGTCCを組み合わせた複合発電システムでは，すべての運用上の制約条件を満足しながら，HHV基準で70%を超える発電効率のサイクルが構築可能であることを示した．ライフサイクルコストの観点からは，SOFCのイニシャルコストがGTCCに比べて高いため，セル数を減らしてSOFCの出力比率を下げ，発電効率を67%に抑えたシステムが最適となった．さらに，システムに要求される運転パターンに応じた最適な設計変数と操作変数を，Multi-Period最適化問題として定式化することにより導出した．

OS4-12 ハイブリッド発電・冷凍サイクル実証実験における2つの接続形態の比較(OS4 省エネルギー・小型分散電源・コジェネ技術,分散と集中の共存)

OS4-12 ハイブリッド発電・冷凍サイクル実証実験における2つの接続形態の比較(OS4 省エネルギー・小型分散電源・コジェネ技術,分散と集中の共存)

Tubular Solid Oxide Fuel Cell/Gas Turbine Hybrid Cycle Power Systems: Status

The solid oxide fuel cell (SOFC) is a simple electrochemical device that operates at 1000°C, and is capable of converting the chemical energy in natural gas fuel to AC electric power at approximately 45% efficiency (net AC/LHV) when operating in a system at atmospheric pressure. Since the SOFC exhaust gas has a temperature of approximately 850°C, the SOFC generator can be synergistically integrated with a gas turbine (GT) engine generator by supplanting the turbine combustor and pressurizing the SOFC, thereby enabling the generation of electricity at efficiencies approaching 60% or more. Conceptual design studies have been performed for SOFC/GT power systems employing a number of the small recuperated gas turbine engines that are now entering the marketplace. The first hardware embodiment of a pressurized SOFC/GT power system has been built for Southern California Edison and is scheduled for factory acceptance tests beginning in Fall 1999 at the Siemens Westinghouse facilities in Pittsburgh, PA. The hybrid power cycle, the physical attributes of the hybrid systems, and their performance are presented and discussed.

97/02204 High efficiency carbonate fuel cell/turbine hybrid power cycle

97/02204 High efficiency carbonate fuel cell/turbine hybrid power cycle

97/01255 High efficiency carbonate fuel cell/turbine hybrid power cycle

97/01255 High efficiency carbonate fuel cell/turbine hybrid power cycle

Simultaneous Production of Desalinated Water and Power Using a Hybrid-Cycle OTEC Plant

A systems study for simultaneous production of desalinated water and electric power using the hybrid-cycle OTEC system was carried out. The hybrid cycle is a combination of open and closed-cycle OTEC systems. A 10 MWe shore-based hybrid-cycle OTEC plant was discussed and corresponding operating parameters were presented. Design and plant operating criteria for adjusting the ratio of water production to power generation was described and their effects on the total system were evaluated. The systems study showed technical advantages of the hybrid-cycle power system as compared to other leading OTEC systems for simultaneous production of desalinated water and electric power generation.