Development of Chemically Recuperated Micro Gas Turbine

Nakagaki, Takao; Ogawa, T.; Hirata, Haruhiko; Kawamoto, Koichi; Ohashi, Yukio; Tanaka, Kiyofumi

doi:10.1115/1.1520158

Cited by 23 publications

(17 citation statements)

References 8 publications

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“…CRGT is an applicable technology for distributed small‐ to medium‐sized GTs (Nakagaki et al. ). It has been demonstrated empirically that CRGT can improve the efficiency of GT power generation by approximately 10%.…”

Section: Methodsmentioning

confidence: 99%

Distributed Cogeneration of Power and Heat within an Energy Management Strategy for Mitigating Fossil Fuel Consumption

Kikuchi

Kanematsu

Sato

et al. 2015

J of Industrial Ecology

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SummaryDistributed energy sources, such as self-power generation, steam boilers, and combined heat and power production (CHP), are operated to manage the supply of energy by optimizing the costs of meeting the demand for electricity and heat. This article was written in conjunction with reports by the United Nations Environment Program's International Resource Panel that quantifies and compares the environmental and natural resource impacts and benefits of using demand-side efficient technologies for greenhouse gas mitigation scenarios from now until 2050. In this article, we examine the potential of using distributed energy sources in future energy systems. First, we reviewed the existing research into several energy technologies, especially into cogeneration systems for CHP, using a bibliometric analysis. The current energy supply/demand in the demand-side sectors in Japan is also reviewed using available statistical data, and an investigation into the energy requirements of industrial manufacturers was performed. After systematizing the results of our review on progress in current research, a scenario analysis was conducted on the potential of distributed energy sources to clarify the contribution of the various technology options. A mismatch between the quality of energy produced, especially heat, or any benefits arising from scale from other energy technologies, can decrease the incentive to implement distributed energy technologies. As a requirement of a regional energy system design and management, distributed energy sources should be considered so that the appropriate technology options can be adopted for the desired energy supply in the demand-side sector. The possibility exists to replace conventional single-generation technologies, such as boilers or power generators, with multigeneration technologies. A change in the grid power mix is one of the most sensitive parameters affecting the performance of cogeneration technologies.

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Section: Methodsmentioning

confidence: 99%

Distributed Cogeneration of Power and Heat within an Energy Management Strategy for Mitigating Fossil Fuel Consumption

Kikuchi

Kanematsu

Sato

et al. 2015

J of Industrial Ecology

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“…3.1 The Basic CRGT System. In the chemically recuperated gas turbine CRGT [20,[24][25][26][27] system shown in Fig. 2, the turbine exhaust heat is recovered in a heat recovery steam generator (HRSG), the superheater section of which is replaced by a methane steam reformer.…”

Section: System Configuration Descriptionmentioning

confidence: 99%

Use of Low/Mid-Temperature Solar Heat for Thermochemical Upgrading of Energy, Part I: Application to a Novel Chemically-Recuperated Gas-Turbine Power Generation (SOLRGT) System

Zhang

Lior

2012

Journal of Engineering for Gas Turbines and Power

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This paper is the first part of a study presenting the concept of indirect thermochemical upgrading of low/mid temperature solar heat, and demonstration of its integration into a high efficiency novel hybrid power generation system. The proposed system consists of an intercooled chemically recuperated gas turbine (SOLRGT) cycle, in which the solar thermal energy collected at about 220 °C is first transformed into the latent heat of vapor supplied to a reformer and then via the reforming reactions to the produced syngas chemical exergy. The produced syngas is burned to provide high temperature working fluid to a gas turbine. The solar-driven steam production helps to improve both the chemical and thermal recuperation in the system. Using well established technologies including steam reforming and low/mid temperature solar heat collection, the hybrid system exhibits promising performance: the net solar-to-electricity efficiency, based on the gross solar thermal energy incident on the collector, was predicted to be 25–30%, and up to 38% when the solar share is reduced. In comparison to a conventional CRGT system, 20% of fossil fuel saving is feasible with the solar thermal share of 22%, and the system overall efficiency reaches 51.2% to 53.6% when the solar thermal share is increased from 11 to 28.8%. The overall efficiency is about 5.6%-points higher than that of a comparable intercooled CRGT system without solar assist. Production of NOx is near zero, and the reduction of fossil fuel use results in a commensurate ∼20% reduction of CO2 emissions. Comparison of the fuel-based efficiencies of the SOLRGT and a conventional commercial Combined Cycle (CC) shows that the efficiency of SOLRGT becomes higher than that of CC when the solar thermal fraction Xsol is above ∼14%, and since the SOLRGT system thus uses up to 12% less fossil fuel than the CC (within the parameter range of this study), it commensurately reduces CO2 emissions and saves depletable fossil fuel. An economic analysis of SOLRGT shows that the generated electricity cost by the system is about 0.06 $/kWh, and the payback period about 10.7 years (including 2 years of construction). The second part of the study is a separate paper (Part II) describing an advancement of this system guided by the exergy analysis of SOLRGT.

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“…Another active area of the CRGT research is the theoretical and experimental studies of steamreforming mechanism and designing a reforming regenerator base on the mechanism. During 2003-2006, Nagasaki studied steam reforming of methane and methanol, and a developed reforming regenerator using the methanol as the fuel [6][7]. In 2008, Huan-Liang Tsai designed a reforming regenerator by using ethanol-steam reforming in a thermal plasma reformer [8].…”

Section: Introductionmentioning

confidence: 99%

Configuration Discussions of the Chemically Recuperated Gas Turbine Powering a Ship

Pan¹,

Zheng²,

Luo³

et al. 2015

Proceedings of the 2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics

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The chemically recuperated gas turbine (CRGT) is a promising engine on ship because of its high thermal efficiency and low pollutant emission. This paper is aimed at determining an applicable configuration of the CRGT for marine applications. Diesel is the selected fuel, and the minimization of Gibbs free energy method (MGFE) is applied to model the diesel-steam reforming reaction. A chemical regenerator (CR) is designed based on the reforming reaction, and a steam generator (SG) is set on the foundation of thermodynamics. Some feasible configurations of the CRGT are proposed based on a marine gas turbine with two spool shaft and a free power turbine and the best one is determined by performance calculation. The best configuration has a 44.51% thermal efficiency at rated 25MW output power of the prototype, and good stability in operation. Additionally, the selected configuration has lower combustion temperature at the same output power with the other configurations, and it can yield less NOX emissions. These works form the foundation of the CRGT being applied in the marine propulsion and provide a research thought for the CRGT in other applications.

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Development of Chemically Recuperated Micro Gas Turbine

Cited by 23 publications

References 8 publications

Distributed Cogeneration of Power and Heat within an Energy Management Strategy for Mitigating Fossil Fuel Consumption

Distributed Cogeneration of Power and Heat within an Energy Management Strategy for Mitigating Fossil Fuel Consumption

Use of Low/Mid-Temperature Solar Heat for Thermochemical Upgrading of Energy, Part I: Application to a Novel Chemically-Recuperated Gas-Turbine Power Generation (SOLRGT) System

Configuration Discussions of the Chemically Recuperated Gas Turbine Powering a Ship

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